WO2007098703A1

WO2007098703A1 - Method, system and media resource device for achieving time shift tv service based on ngn network

Info

Publication number: WO2007098703A1
Application number: PCT/CN2007/000662
Authority: WO
Inventors: Jun Yan; Xiangyang Wu; Jincheng Li
Original assignee: Huawei Technologies Co., Ltd.
Priority date: 2006-03-02
Filing date: 2007-03-02
Publication date: 2007-09-07
Also published as: CN101030961A; CN101030961B; CN101313574A; CN100579209C

Abstract

A method, a system and a media resource device for achieving the time shift TV service based on the NGN network are provided. In the present invention, the service request, which is initiated by a user end, is routed to a application service through a call session control function entity; a resource request is initiated to a media resource function controller entity by the application services; the service request response is returned to application server by the media resource function controller entity after the interaction between the media resource function controller entity and the media resource function process entity; the description service request response is routed to the user end through the call session control function entity by the description application server; a multicast service stream is built by the user end and the media resource function process entity; when the service stream control is requested by the user end, a unicast negotiation is processed by the media resource function and the user end, the unicast service stream is transmitted to the user end according to the result of the unicast negotiation. The present invention implements the switch-controlling from multicast service stream to unicast service stream by using the intrinsic function entity MRF of the NGN and provides an unicast service stream, provides a time-shifting TV service in the NGN network,and enriches the IMS service.

Description

Method and system for realizing time-shifted television service based on NGN network, media resource equipment The application is submitted to the Chinese Patent Office on March 2, 2006, and the application number is 200610034107.3, and the invention name is "a time-shifted television based on the NGN network. The method of the business and its system, the priority of the Chinese patent application, the entire contents of which are incorporated herein by reference.

The present invention relates to a technology for implementing time-shifted television in an NGN network, and more particularly to a method and system for implementing a time-shifted television service based on an NGN network, and a media resource device.

Background technique

Time shift TV (shift TV) is a kind of video service that comes into being with the maturity of broadband networks. It is one of the forms of services that can be provided by the rapidly developing Internet Protocol Television (IPTV). The service enables users to pause and rewind the program while watching live TV programs, and to fast forward to the moment when the live TV is currently playing.

A method for implementing time-shifted television in the prior art is a solution for implementing a time-shifted television service based on an existing IP network:

As shown in FIG. 1, the entire system is composed of a head end 101, a middleware 102, a video on demand (VOD) system 103, and a machine box 104, among which:

The headend 101 is for receiving and encoding a television program for IP network transmission; the middleware 102 provides a program listing for the user terminal and processes the user's control operations on the program; the VOD system 103 receives the television program from the headend 101 and performs recording, The user provides a unicast program source for the user when using the time shift operation; the set top box 104 receives the program decoded and transmits the program content to the display terminal display, and interacts with the middleware 102 to provide the program list display for the user, accepts the user control command and interacts with the network. control.

The basic process of using time-shifted TV services in the system is:

The set top box 104 begins to obtain a program list from the middleware 102, and receives a television program by the multicast group that plays the selected program in the set top box 104 according to the program list, and the program is transmitted in a multicast manner;

If the user selects the program to pause or rewind, the set top box 104 sends a request to the middleware 102, and the middleware 102 interacts with the VOD system 103 to locate the corresponding unicast program source and delivers the address to the middleware 102, and the middleware 102 feeds back to the set top box. 104; The set top box 104 then retrieves the unicast program stream from the VOD system 103 and controls the program using the Real Time Streaming Protocol (RTSP). If the user chooses to fast forward and catch up with the live program, the set top box 104 switches to the multicast receiving state again.

The above solution belongs to the solution of the existing IP network, and does not necessarily apply to the Next Generation Network (NGN).

NGN is a converged network based on packet technology. It is based on packet switching and uses a separate architecture of bearer and control. The architecture diagram is divided into a service layer and a transport layer, wherein the service layer includes: a public switched telephone network/integrated service digital network (PSTN/ISDN, Public Switched Telephone Network/ Integrated Services Digital Network) simulation subsystem, and an internet protocol multimedia subsystem ( IMS (Internet protocol Multimedia Subsystem), other application subsystems, and user data shared by multiple application subsystems and an application server (Application Server) that provides services to users based on these business layer subsystems.

Wherein, IMS is a third generation mobile communication Partnership Project ^{(3GPP, 3 rd Generation Partnership Project} ) R5 increased Wideband Code Division Multiple stage (WCDMA, Wideband Code Division Multiple Access ) network is superimposed over an existing packet domain A subsystem that introduces the SIP protocol as a service control protocol to provide rich multimedia services; Session establishment in IMS is implemented by Session Initiation Protocol (SIP), Real-Time Transport Protocol/Real-Time Transmission Control Protocol (RTP/RTCP, Real- Time Transport Protocol/Real-time Transport Control Protocol (SDP), Session Description Protocol (SDP), RTSP, and Domain Name Service (DNS) are completed.

The main functional entities in the IMS include the call control entity CSCF that controls functions such as user registration and session, the AS that provides various service logic control functions, the home subscriber server HSS that centrally manages user subscription data, and the interworking with the circuit-switched network. Media Gateway Control Function/IP Multimedia - Media Gateway (MGCF / IM-MGW), the user accesses the IMS through the current proxy node proxy-call control function entity (P-CSCF), session and service trigger control and service control with the AS The interaction is done by the home domain service node S-CSCF (service-call control function entity) where it is registered.

That is to say, NGN supports the use of SIP communication. In the prior art, service request and control signaling is implemented by HTTP/RTSP, and the potential capability of SIP is not fully utilized. Therefore, the method of implementing time-shifted television in the prior art is not applicable to NGN.

Summary of the invention

Embodiments of the present invention provide a method and system for implementing time-shifted TV services based on an NGN network, and a media resource device, which can implement time-shifted TV services in an NGN network.

An embodiment of the present invention provides a method for implementing a time shift television service based on a next generation network, including:

The service request initiated by the terminal is routed to the application server by the call session control function entity; the application server initiates a resource request to the media resource entity according to the service request;

The media resource entity returns a service request response to the application server; the service request response carries at least the media transmission parameter determined by the media resource entity;

The application server routes the service request response to the terminal through the session control function entity; the terminal establishes a multicast service flow with the media resource entity according to the determined media transmission parameter; and when the terminal requests the service flow control, the media resource The entity and the terminal perform unicast negotiation, and send a unicast service flow to the terminal according to the unicast negotiation result.

Another embodiment of the present invention provides a method for implementing a time shift television service based on a next generation network, including:

The service request initiated by the terminal is routed to the application server by the call session control function entity; the service request carries the real-time streaming protocol media control channel parameter of the terminal;

The application server sends a resource request to the media resource control function entity according to the service request; after the media resource control function entity and the media resource bearer entity interact, the service request response is returned to the application server; the service request response carries the media resource bearer entity Determined real-time streaming protocol media control channel parameters;

The symptom server routes the service request response to the terminal via a call session control function entity;

And establishing, by the terminal, a real-time streaming protocol connection with the media resource bearer entity according to the determined real-time streaming protocol media control channel parameter;

The terminal and the media resource bearer entity use the real-time streaming protocol to negotiate and negotiate media transmission parameters, and establish a multicast service flow;

When the terminal requests service flow control, the entity resource bearer entity and the terminal perform unicast negotiation. The unicast service flow is sent to the terminal according to the unicast negotiation result.

Still another embodiment of the present invention provides a method for implementing a time shift television service based on a next generation network, including:

The application server sends a resource request to the media resource control function entity according to the service request; after the media resource control function entity and the media resource bearer entity interact, the service request response is returned to the application server; and the service request response carries the media resource control function. Real-time streaming protocol media control channel parameters determined by the entity;

The application server routes the service request response to the terminal via a call session control function entity;

And establishing, by the terminal, a real-time streaming protocol connection with the media resource control function entity according to the determined real-time streaming protocol media control channel parameter;

The terminal uses the real-time streaming protocol connection to negotiate media transmission parameters with the media resource carrying entity through the media resource control function entity, and establish a multicast service flow;

When the terminal requests the service flow control, the media resource bearer entity and the terminal perform unicast negotiation, and send the unicast service flow to the terminal according to the unicast negotiation result.

Yet another embodiment of the present invention provides a system for implementing time-shifted TV service based on a next-generation network, including: an application server, a media resource control function entity, a media resource bearer entity, a proxy call session control function entity, and a service call session control function. Entity; among them,

The application server is configured to initiate a resource request to the media resource control function entity according to the service request from the terminal, where the service request carries at least the media transmission parameter of the terminal; and the service request response from the media resource control function entity Routing to the terminal;

The media resource control function entity is configured to interact with the media resource bearer entity to return a service request response to the application server; and the service request response carries at least the media transmission parameter determined by the media resource bearer entity;

The media resource carrying entity is configured to determine a media transmission parameter, and establish a multicast service flow with the terminal according to the determined media transmission parameter; and when the terminal requests the service flow control, perform unicast negotiation with the terminal, according to the unicast negotiation result. The terminal sends a unicast service flow; The proxy call session control function entity is configured to forward a request and response message between the terminal and the service call session control function entity;

The service call session control function entity is configured to trigger a service request to the application server according to the trigger rule to route the message.

Another embodiment of the present invention provides a system for implementing a time shift television service based on a next generation network, including: an application server, a media resource control function entity, a media resource bearer entity, a proxy call session control function entity, and a service call session control function. Entity; among them,

The application server is configured to initiate a resource request to the media resource control function entity according to the service request from the terminal, where the service request carries a real-time streaming protocol media control channel parameter of the terminal; and the service request from the media resource control function entity Response routing to the terminal;

The media resource control function entity is configured to interact with the media resource bearer entity to return a service request response to the application server, where the service request response carries a real-time streaming protocol media control channel parameter determined by the media resource bearer entity;

The media resource bearer entity is configured to determine a real-time streaming protocol media control channel parameter, establish a real-time streaming protocol connection with the terminal according to the determined real-time streaming protocol media control channel parameter, and negotiate the media transmission parameter with the terminal by using the real-time streaming protocol connection, Establishing a multicast service flow; when the terminal requests service flow control, performs unicast negotiation with the terminal, and sends a unicast service flow to the terminal according to the unicast negotiation result; the proxy call session control function entity is used to forward the terminal and the monthly call session. Controlling request and response messages between functional entities;

A further embodiment of the present invention provides a media resource device device, including: a media resource control function entity and a media resource bearer entity; wherein the media resource control function entity is configured to interact with the media resource bearer entity to return a service to the application server Requesting a response; the service request response carries at least a media transmission parameter determined by the media resource bearer entity;

The media resource bearer entity is configured to determine a media transmission parameter, and establish a multicast service flow with the terminal according to the determined media transmission parameter; when the terminal requests the service flow control, the terminal performs unicast negotiation, according to the unicast negotiation result. Send a unicast service flow to the terminal.

Another embodiment of the present invention provides a media resource device apparatus, including: media resource control a functional entity and a media resource carrying entity; wherein

The media resource bearer entity is configured to determine a real-time streaming protocol media control channel parameter, establish a real-time streaming protocol connection with the terminal according to the determined real-time streaming protocol media control channel parameter, and use the real-time streaming protocol connection to negotiate media transmission parameters with the terminal, A multicast service flow is established. When the terminal requests service flow control, the terminal performs unicast negotiation, and sends a unicast service flow to the terminal according to the unicast negotiation result.

The embodiment of the present invention utilizes the original functional entities MRFC and MRFP in the NGN to complete the switching control of the multicast service flow to the unicast service flow and provide the unicast service flow, and provides the time-shifted TV service in the NGN network, enriching the IMS service; And user authentication, security, billing, etc. can use existing mechanisms or enhancement mechanisms of IMS, and can make full use of existing resources.

DRAWINGS

Figure 1 is a time shift television scheme based on an existing IP network;

2 is a system architecture diagram of an embodiment of the present invention;

3 is a flowchart of Embodiment 1 of the present invention;

4 is a flowchart of a mode 1 in Embodiment 2 of the present invention;

Figure 5 is a flowchart of the mode 2 in the second embodiment of the present invention;

6 is a flowchart of Embodiment 3 of the present invention;

7 is a flowchart of Embodiment 4 of the present invention;

8 is a schematic diagram of an embodiment of a media resource device apparatus according to the present invention;

FIG. 9 is a schematic diagram of another embodiment of a media resource device apparatus according to the present invention.

detailed description

The invention will now be described in detail in conjunction with the specific embodiments and drawings.

As shown in FIG. 2, the system of the present invention includes a terminal 201, a proxy CSCF (Call Session).

Control Function, Call Session Control Function 206, Service CSCF 205, AS (Application Server) 202, MRFC (Media Resource Control Function Entity) 203, and MRFP (Media Resource Bearer Function Entity) 204, and the like.

The terminal 201 is configured to perform service negotiation with the AS 202, requesting the AS 202 to provide a service. Proxy CSCF 206 is used to forward request and response messages between the terminal 201 and the serving CSCF 205. The service CSCF 205 is configured to trigger a service request message to the AS 202 according to a trigger rule, and route the message; the AS 202 is configured to provide a service to the user, perform necessary service negotiation with the terminal 201, and present the media resource to the MRFC 203 according to the result of the negotiation. Request; MRFC 203 receives the media resource request of AS 202 and controls MRFP 204 to perform media resource allocation. The MRFP 204 is controlled by the MRFC 203 to provide media resources to the terminal 201, such as to provide a video/audio program stream.

Among them, the proxy CSCF 206 and the service CSCF 205 may be referred to as CSCF. MRFC 203 and MRFP 204 may be referred to as MRF.

In the embodiment of the present invention, the implementation of the time-shifted TV service is divided into two basic processes: one is a process of establishing a multicast service flow and receiving when watching a real-time program; and the other is when the user performs program control (such as suspension, Backward, fast forward) The process of converting a receiving multicast stream to a requesting unicast stream. These two processes cooperate with the control process of the entire time shifting TV.

In the process of watching a real-time program to establish and receive a multicast service stream, the user terminal (UE) needs to obtain a multicast source address, a program multicast address, and a program encoding format of the real-time program. In the IMS network, the multicast source corresponds to the MRFC ( The media resource control function entity) and the MRFP (media resource processing function entity), wherein the MRFC acts as a media control plane and the MRFP acts as a media transport plane. Since the process of collecting and encoding the television signal is not the focus of the present invention, the technical solution of the present invention assumes that the result of the time-shifted television coding is obtained at the MRFP. In the technical solution of the present invention, the SIP message is used between the user terminal and the AS. A multicast service flow is established after negotiating the RTSP address and port information and/or media transmission parameters.

During the course of the service, it is necessary to provide the user with a mechanism of controlling (pausing, rewinding, fast forwarding, and even negotiating a new unicast service flow, etc.). In order to support the user's control command, the technical solution described in the present invention adopts the program. The method is implemented by performing a control after the flow is switched from the multicast stream to the unicast stream. The specific switching mechanism is as described in the embodiment.

According to different mechanisms for establishing a multicast service flow and switching between a multicast service flow and a unicast service flow, the present invention can adopt the following embodiments:

Embodiment 1:

Use SIP to perform RTSP negotiation to establish a multicast service flow, and use RTSP for subsequent service control and service flow switching mechanisms;

The process of establishing an initial multicast service flow can use SIP for service negotiation, in the SIP negotiation process. Only negotiate the RTSP channel information, including at least the RTSP address and port information. After negotiating the RTSP address and port number information, the user terminal uses the RTSP standard process to negotiate the transmission parameters with the RTSP signaling endpoint (RTP, RTCP, The codec format, etc., wherein the multicast stream is used to transmit the program stream, and after the initial service stream is established, the program is sent to the user from the service side by the multicast stream.

The specific process is as follows: A service request sent by the terminal to the AS, where the request carries the RTSP address and port information of the terminal. The request is routed to the Media Control Function Entity (MRFC), and the media control function entity controls the media bearer function entity MRFP to obtain the media bearer function. The MRFP entity allocates port information for the RTSP connection. The service request response returned by the MRFC carries the address and port information of the RTFP connection of the MRFP. The terminal establishes an RTSP connection to the address and port according to the received RTSP address and port information. After the RTSP connection is successfully established, the terminal negotiates the RTP address and port parameters for transmitting the media stream through the RTSP connection.

If the user performs playback control (reverse, pause, etc.) during the viewing process, the RTSP is used to renegotiate the service flow so that the service is provided to the user from the service point in a unicast manner. In order to switch to the unicast service flow, the existing service-side RTSP implementation mode needs to be modified: that is, the service side should not reject the control command after receiving the user instruction, but determine that the user terminal needs to perform the unicast service flow according to the control instruction. Negotiation, and initiate unicast service negotiation with the user from the service side, including negotiating unicast transmission parameters, codec specifications, etc. The negotiation process is performed by the standard negotiation process of RTSP. The result of the negotiation allows the service side to provide the service flow to the user in unicast mode, and the user's control instructions are applied to the unicast service flow.

In order to provide a unicast service flow, the service side first performs unicast recording on the program sent in multicast mode, and provides unicast transmission resources. At the same time, in order to save network resources, the user may request to close the program stream played in multicast mode during the negotiation process; for the service side, if there are other users receiving the program, only the user request needs to be confirmed without closing the program. flow. Of course, in order to handle the efficiency, the service side can choose to always send the program stream, and whether the user receives and uses it is determined by the service status.

In order to support the playback control, the service side needs to record the type of service flow associated with each user at the beginning of the service and maintain the RTSP communication with the user. Once the user performs the play control, the service side can perform corresponding actions based on the user's instruction, for example, it can decide to provide the user with a single according to the "back" and "pause" commands. Broadcast traffic and apply appropriate control over unicast traffic. In addition, when controlling the unicast service flow, if the time point indicated by the "fast forward" command exceeds the current time of the real-time program stream (the time point has multiple representations in the RTSP, the service side can be converted into a unified representation for In comparison, the service side can re-negotiate with the user to close the unicast stream, and then provide the multicast service flow to the user, thereby switching to the real-time program stream; this negotiation process can be performed using the standard process of RTSP. Of course, after switching to the real-time program stream, press "Fast forward," and the button can be left unprocessed for the service side.

The flowchart of the first embodiment is as shown in FIG. 3:

Step 301: The terminal initiates a service request to the AS (the request is performed by using the SIP, and the RTSP channel is negotiated in the SDP. To carry the RTSP parameter in the SDP, the processing of the conference control may be used in the SDP to increase the media transmission control. Channel designation), the request is routed to the AS through the P-CSCF, S-CSCF;

Step 302: The AS initiates a resource request to the MRFC according to the request, where the request requires the MRFC to determine an RTSP media control channel.

Step 303: The MRFC interacts with the MRFP to determine an RTSP media control channel parameter, which is allocated by the MRJFP and terminated on the MRFP; and the interaction is performed by using the H.248 protocol;

Step 304: After obtaining the RTSP media control channel parameter, the MRFC returns a result to the AS, where the RTSP control parameter is carried;

Step 305: The AS routes the foregoing negotiation result to the user terminal by using the S-CSCF and the P-CSCF, and the user terminal obtains the RTSP connection parameter.

Step 306: The user terminal establishes an RTSP connection with the MRFP.

Step 307: The user terminal and the MRFP perform media transmission parameter negotiation, where the negotiation process is used to determine information such as a multicast address and a port for providing a service. The multicast address and port may be pre-planned on the service side, or may be temporarily allocated. of;

Step 308: After obtaining the service multicast address, a multicast forwarding path needs to be established between the user terminal and the MRFP. The process can be performed by using IGMP and PIM-SM.

Step 309: After the multicast forwarding path is established, the initial service flow is established, and the television program is transmitted from the MRFP to the user terminal in a multicast manner;

Step 310: If the user applies a control action, such as "backward", the action is converted to an RTSP control command and sent to the MRFP; Step 311: After receiving the foregoing control command, the service side (MRPP) determines that the instruction is for a unicast service flow, and needs to perform multicast to unicast service flow switching before controlling, so the RTSP and the user terminal are used. Negotiating the unicast service flow, deactivating or stopping the multicast service flow during the negotiation process. (Whether the multicast service flow is actually stopped depends on the policy of the service side, that is, the multicast service flow is only logical for the user. The transmission is stopped. The service side needs to locate the unicast program source according to the program corresponding to the existing multicast service flow and allocate the system resources during the multicast to unicast handover;

Step 312: After the unicast stream negotiation is completed, the user terminal and the MRFP establish a unicast transport stream, and the program is sent to the user in a unicast manner;

Step 313: Perform playback control on the unicast service flow user by using an existing RTSP control channel, such as "backward", "forward", and the like;

Step 314: After a period of time, the user requests to return to watching the live broadcast program, and needs to re-provide the multicast service flow to the user to implement; the control may be reflected in the user pressing the "fast forward" button so that the selected time point exceeds the real-time program. At the current time, the control command is passed to the MRFP through the RTSP;

Step 315: The MRFP determines that it needs to switch to the multicast service flow by using the time information carried by the foregoing control command; it performs media transmission parameter negotiation with the user terminal, stops the unicast service flow, and activates the multicast service flow;

Step 316: The service flow is sent to the user in multicast mode.

In the solution of the foregoing first embodiment, the RTSP parameter is allocated by the MRFP, returned to the AS by the MRFC, and then carried to the terminal. It is understood by those skilled in the art that another possible implementation form is: RTSP parameters are allocated by the MRPC, returned to the AS by the MRFC, and then carried to the terminal for use. A subsequent RTSP connection is established between the terminal and the MRFC, and the MRFC converts the RTSP control signaling into H.248 control signaling or the MRFC as an RTSP proxy for media resource control (ie, controlling MRFP), including media playback control and media transmission parameters. Assignment, etc.

Embodiment 2:

The process of establishing an initial multicast service flow uses SIP for service negotiation, and negotiates RTSP channel information and media transmission parameters in the SIP negotiation, including at least an RTSP address and port, a service multicast address, and a port.

The specific process is as follows: The user terminal sends a SIP request to the AS, where the request carries both the RTSP address and port information of the terminal and the RTP address and port information used to transmit the media stream. The request road After arriving at the MRFC, the MRFC controls the MRFP and interactively obtains the port information that the MRFP allocates for the RTSP connection and the RTP connection. Therefore, in the service request response returned by the MRFC, the address and port information of the RTFP connection of the MRFP and the address and port information of the RTP connection are carried at the same time. In this way, after the interaction, the RTSP connection for the interaction control and the RTP connection for transmitting the media stream can be directly established between the terminal and the MRFP.

The switching between the multicast stream and the unicast stream is performed by the SIP and the RTSP. The following two methods are available:

Mode 1: When the user performs the playback control, the unicast service negotiation and playback control are performed on the negotiated RTSP channel, and the SIP side is notified to notify the service side to end or deactivate the multicast service flow.

When the user performs the play control, the control request is transmitted to the service side by using the RTSP control command, and the processing requirement for the monthly service side is the same as that in the first embodiment. After the user negotiates with the RTSP on the service side, the user side can use the initial SIP session of the service to send media updates. Specifically, the SIP update (Update) method is used to: disable or deactivate (such as setting the initial service receiving port to 0). The media stream, so that when the signaling is routed through the IMS, the network side entity can correctly release the resources, such as the resource occupation caused by the multicast control of the P-CSCF.

When the user terminal needs to switch to the multicast service flow again (for example, "forward, the command exceeds the current real-time program time point"), the service side can negotiate with the user to close the unicast service flow through RTSP signaling, and the service side can use the SIP. The Update method updates the media description to activate the multicast service flow, and the network side resends the multicast service flow to the user and performs the necessary conversion.

Manner 2: When the user performs playback control, the unicast transmission parameters are negotiated by SIP signaling, and the playback control is performed by the initially negotiated RTSP channel.

When the user performs the play control, the control request is transmitted to the service side by using the RTSP control command. The processing requirement for the service side is the same as that described in the first embodiment. When the service side detects that it needs to switch to the multicast service flow (such as " The forward "instruction exceeds the current real-time program time point", the service side may use the SIP update method to update the media description to perform unicast service flow negotiation, the negotiation process keeps the RTSP channel unchanged, and only stops or deactivates the multicast service flow. And increase the negotiation of the unicast service stream transmission parameters. This negotiation process is performed by the SDP standard negotiation mechanism. After the negotiation is completed, the RTSP control instructions are actually applied to the unicast traffic.

When the foregoing SIP negotiation signaling is routed through the IMS, the network side entity can correctly allocate resources. The resource occupancy caused by the multicast control of the P-CSCF as described above.

In the above process, RTSP is only used for playback control and not for transmission parameter negotiation. This requires the RTSP to be modified to meet the requirements.

The specific flow chart of mode 1 is shown in Figure 4:

Step 401: The terminal initiates a service request to the AS (the request is performed by using the SIP, and is performed in the SDP.

Negotiation of the RTSP channel and the media transmission parameters. In order to carry the RTSP parameters in the SDP, the processing of the conference control may be used in the SDP to increase the negotiation of the media transmission control channel. The request is routed through the P-CSCF and the S-CSCF. To the AS;

Step 402: The AS initiates a resource request to the MRFC according to the request, where the request requires the MRFC to determine an RTSP media control channel and a media transmission parameter.

Step 403: The MRFC interacts with the MRFP to determine an RTSP media control channel parameter and a media transmission parameter, where the parameter is allocated by the MRFP and terminated on the MRFP; and the interaction is performed by using H.248;

Step 404: After obtaining the RTSP media control channel parameter and the media transmission parameter, the MRFC returns the result to the AS.

Step 405: The AS routes the foregoing negotiation result to the user terminal by using the S-CSCF and the P-CSCF, and the user terminal obtains the RTSP connection parameter and the media transmission parameter.

Step 406: In order to provide the transmission quality guarantee for the media stream, when the negotiation message is routed through the P-CSCF, the P-CSCF may request the multicast control process according to the media description information; Step 407, according to the negotiation in step 5 As a result, the user terminal establishes an RTSP connection with the MRFP. Step 408: After obtaining the service multicast address, the multicast forwarding path is established between the user terminal and the MRPP. The process can be performed by using IGMP and PIM-SM.

Step 409: After the multicast forwarding path is established, the initial service flow is established, and the television program is transmitted from the MRFP to the user terminal in a multicast manner;

Step 410: If the user applies a control action, such as "backward", the action causes SIP to perform media renegotiation, and the process may be performed by using the SIP Update method to deactivate or stop the multicast service flow; When the P-CSCF is routed, the P-CSCF can take correct actions to release the occupied network resources; the negotiation process can be performed between the MRFC and the MRFP using H.248;

Step 411: The control action of the user is further converted into an RTSP control command and sent to the MRPP. After the service side (MRFP) receives the control instruction, it determines that the instruction should be applied to the unicast service flow. Therefore, it is necessary to perform multicast to unicast service flow switching in order to control. Since the above has used SIP to stop the transmission of the multicast service stream, the service side (MRFP) only needs to respond to the existing multicast service flow. The program locates the unicast program source and allocates the system resources; the MRFP determines that the unicast service negotiation is required, and the unicast service stream transmission negotiation is performed using the RTSP and the user terminal;

Step 412: After the unicast stream negotiation is completed, the user terminal and the MRPP establish a unicast transport stream, and the program is sent to the user in a unicast manner;

Step 413: For the unicast service flow, the user uses the existing RTSP control channel to perform playback control, such as "backward", "forward", and the like;

Step 414: After a period of time, the user requests to return to the live broadcast program to re-deliver the multicast service flow to the user (the control may be reflected in the user pressing the "fast forward" button so that the selected time point exceeds the current time point of the real-time program. The control command is transmitted to the MRFP through the RTSP; the MRFP determines that the multicast to unicast service flow switching is required, so the RTSP is used to terminate the unicast service flow transmission);

Step 415: The user terminal further activates the multicast service flow transmission by using the SIP. The SIP signaling is routed through the P-CSCF and the S-CSCF, and the P-CSCF can perform multicast control according to the foregoing manner. The negotiation process is between the MRFC and the MRFP. Can be performed using H.248;

Step 416: The service flow is sent to the user in a multicast manner.

The specific flow chart of mode 2 is shown in Figure 5:

Step 501: The terminal initiates a service request to the AS (the request is performed by using the SIP, and the negotiation of the RTSP channel and the media transmission parameter is performed in the SDP. To carry the RTSP parameter in the SDP, the processing method similar to the conference control in the SDP may be used. Adding a negotiation to the media transmission control channel), the request is routed to the AS through the P-CSCF and the S-CSCF;

Step 502: The AS initiates a resource request to the MRFC according to the request, where the request requires the MRJFC to determine an RTSP media control channel and a media transmission parameter.

Step 503: The MRFC interacts with the MRFP to determine an RTSP media control channel parameter and a media transmission parameter, where the parameter is allocated by the MRFP and terminated on the MRFP; and the interaction is performed by using H.248;

Step 504: The MRFC obtains the RTSP media control channel parameter and the media transmission parameter, and returns the result to the AS.

Step 505: The AS routes the foregoing negotiation result to the user terminal by using the S-CSCF and the P-CSCF, and the user terminal obtains the RTSP connection parameter and the media transmission parameter. Step 506: In order to provide transmission quality guarantee for the media stream, when the negotiation message is routed through the P-CSCF, the P-CSCF may request the multicast control process according to the media description information. Step 507: According to the negotiation result, the user terminal Establish an RTSP connection with the M FP;

Step 508: After obtaining the service multicast address, a multicast forwarding path needs to be established between the user terminal and the MRFP. The process can be performed by using IGMP and PIM-SM.

Step 509: After the multicast forwarding path is established, the initial service flow is established, and the television program is transmitted from the MRFP to the user terminal in a multicast manner;

Step 510: At this time, the user applies a control action, such as "backward", which causes media renegotiation using SIP. The process can be performed by using the SIP Update method to deactivate or stop the multicast service flow, in SIP signaling. Negotiating unicast traffic flows simultaneously to determine unicast transmission parameters; resources; the negotiation process can be performed between the MRFC and the MRFP using H.248;

Step 511: After the unicast stream negotiation is completed, the user terminal and the MRFP establish a unicast transport stream, and the program is sent to the user in a unicast manner;

Step 512: For the unicast service flow, the user uses the existing RTSP control channel to perform playback control, such as "backward", "forward,", etc.;

Step 513: After a period of time, the user requests to return to the live broadcast program to re-deliver the multicast service flow to the user (the control may be reflected in the user pressing the "fast forward" button so that the selected time point exceeds the current time point of the real-time program. The user terminal further activates the multicast service flow transmission by using SIP, the SIP signaling is routed through the P-CSCF and the S-CSCF, and the P-CSCF can perform multicast control as described above; at the same time, stop during the SIP negotiation process. The transmission of a unicast service flow; the negotiation process can be performed between M FC and MRPP using H.248;

Step 514: The service flow is sent to the user in a multicast manner.

In the solution of the foregoing embodiment 2, the RTSP parameter is allocated by the MRFP, returned to the AS by the MRFC, and then carried to the terminal. It is understood by those skilled in the art that another possible implementation form is: RTSP parameters are allocated by the MRFC, returned to the AS by the MRFC, and then carried to the terminal. A subsequent RTSP connection is established between the terminal and the MRFC, and the MRFC converts the RTSP control signaling into H.248 control signaling or the MRFC as an RTSP proxy for media resource control (ie, controlling MRFP), including media playback control and media transmission parameters. Assignment, etc. Embodiment 3: The process of establishing an initial multicast service flow adopts SIP to perform service negotiation. In the initial SIP negotiation, only media transmission parameters are negotiated, including at least a service multicast address and a port. After the initial negotiation is completed, the service flow is sent in multicast mode.

The specific description is as follows: The terminal initiates a SIP service request to the AS, and performs media transmission parameter negotiation in the SDP; the AS initiates a resource request to the MRFC according to the request, the request requires the MRFC to determine a media transmission parameter; and the MRFC interacts with the MRPP to determine the media. The transmission parameter, which is assigned by the MRFP and terminated on the MRFP; the MRFC obtains the media transmission parameter and returns the result to the AS, which carries the negotiation result; the AS routes the negotiation result to the user terminal through the S-CSCF and the P-CSCF, and the user The terminal obtains the media transmission parameter. After the service multicast address is obtained, a multicast forwarding path is established between the user terminal and the MRFP to establish an initial multicast service flow.

When the user performs the play control, the user can use the SIP Update message to negotiate the RTSP transmission channel, in which the multicast service flow can be stopped or deactivated. The newly negotiated RTSP channel is used as a control for subsequent operations in the same manner as the two methods described in the second embodiment.

The specific flow chart is shown in Figure 6:

Step 601: The terminal initiates a service request to the AS (the request is performed by using the SIP, and the media transmission parameter is negotiated in the SDP), and the request is routed to the AS through the P-CSCF and the S-CSCF;

Step 602: The AS initiates a resource request to the MRFC according to the request, where the request requires the MRFC to determine a media transmission parameter.

Step 603: The MRFC interacts with the MRFP to determine a media transmission parameter, where the parameter is allocated by the MRFP and terminated on the MRFP; and the interaction is performed by using H.248;

Step 604: After obtaining the media transmission parameter, the MRFC returns a result to the AS, where the negotiation result is carried;

Step 605: The AS routes the foregoing negotiation result to the user terminal by using the S-CSCF and the P-CSCF, and the user terminal obtains the media transmission parameter.

Step 606: In order to provide a transmission guarantee for the media stream, when the negotiation message is routed through the P-CSCF, the P-CSCF may request a multicast control process from the SPDF according to the media description information. Step 607: Obtain Service Multicast After the address, the multicast forwarding path needs to be established between the user terminal and the VCRJFP. This process can be performed by using IGMP and PIM-SM.

Step 608: After the multicast forwarding path is established, the initial service flow is established. Passing the TV program from the MRFP to the user terminal in a multicast manner;

Step 609: If the user applies a control action, such as "backward", the action causes SIP to perform media renegotiation. The process may be performed by using the SIP Update method to deactivate or stop the multicast service flow. The unicast service flow negotiation is performed at the same time to determine the unicast transmission parameter and the RTSP control channel; when the negotiation message is routed through the P-CSCF, the P-CSCF may take correct action to release the occupied network resource; H.248 can be used between MRFC and MRFP.

In the solution of the foregoing embodiment 3, the RTSP parameter is allocated by the MRFP, returned to the AS by the MRFC, and then carried to the terminal. Those skilled in the art understand that another possible implementation is that the RTSP parameters are assigned by the MRFC, returned to the AS by the MRFC, and carried to the terminal for use. A subsequent RTSP connection is established between the terminal and the MRFC, and the MRFC converts the RTSP control signaling into H.248 control signaling or the MRFC as an RTSP proxy for media resource control (ie, controlling MRFP), including media playback control and media transmission parameters. Assignment, etc.

Embodiment 4: The process of establishing an initial multicast service flow adopts a SIP service negotiation mode, and supports subsequent service control processes by extending the SIP function, and does not require RTSP participation.

When the user performs playback control, SIP can be used as the playback control signaling to extend the SIP accordingly. For example, the xml-based script language is used to describe the control information carried in the SIP signaling for control purposes. After receiving the user control command, the service side needs to switch the multicast service flow to the unicast service flow. The handover process can be performed by using the SIP Update message, in which the multicast service flow is stopped or deactivated, and the unicast service flow is performed. Negotiation, the negotiation process can be completed using the standard mechanism of media negotiation. When the foregoing SIP negotiation signaling is routed through the IMS, the network side entity can correctly release resources, such as the resource occupation by the multicast control of the P-CSCF.

A specific flowchart is shown in FIG. 7, wherein steps 701 to 708 are the same as steps 601 to 608 in the third embodiment, and different steps are described below:

Step 709: If the user applies a control action, such as "backward", the action causes SIP to perform media renegotiation. The process may be performed by using the SIP update method to deactivate or stop the multicast service flow. The unicast service flow negotiation is performed at the same time to determine the unicast transmission parameter; when the negotiation message is routed through the P-CSCF, the P-CSCF may take correct actions to release the occupied network resources; the MRFC and the MRFP during the negotiation process Can be done using H.248 interaction; Step 710: After the unicast stream negotiation is completed, the user terminal and the MRFP establish a unicast transport stream, and the program is sent to the user in a unicast manner.

Step 711: For the unicast service flow, the user uses SIP to perform playback control, and by defining a new SIP method for each control instruction or defining only one control method, specifically controlling the control instruction described in the xml-based language, and carrying the method in the method Passed to the MRFC, which in turn controls the MRFP by the MRFC (eg using H.248);

Step 712: After a period of time, the user requests to return to the live broadcast program to re-deliver the multicast service flow to the user (the control may be reflected in the user pressing the "fast forward" button so that the selected time point exceeds the current time point of the real-time program. The user terminal further activates the multicast service flow by using SIP, and the SIP signaling is routed through the P-CSCF and the S-CSCF, and the P-CSCF can perform multicast control as described above; at the same time, stop the single call during the SIP negotiation process. Broadcast traffic; during the negotiation process, the MRFC and the MRFP can be completed by using H.248 interaction;

Step 713: The service flow is sent to the user in a multicast manner.

In addition to the above embodiments, the manner in which the multicast stream is established and switched between the multicast stream and the unicast stream can also be combined with the combination of the above embodiments.

Referring to FIG. 2 again, the system for implementing time-shifted TV service based on the next generation network in the embodiment of the present invention includes a terminal 201, a proxy CSCF (Call Session Control Function) 206, a service CSCF 205, and an AS ( The application server 202, the MRFC (Media Resource Control Function Entity) 203, and the MRFP (Media Resource Bearer Function Entity) 204, and the like.

The system of the embodiment of the present invention is applicable to various scenarios.

In a scenario, the application server 202 is configured to initiate a resource request to the media resource control function entity 203 according to the service request from the terminal 201, where the service request carries at least a media transmission parameter of the terminal; The service request response of the control function entity 203 is routed to the terminal 201;

The media resource control function entity 203 is configured to interact with the media resource bearer entity 204 to return a service request response to the application server 202. The service request response carries at least the media transmission parameter determined by the media resource bearer entity.

The media resource bearer entity 204 is configured to determine a media transmission parameter, establish a multicast service flow with the terminal 201 according to the determined media transmission parameter, and when the terminal 201 requests the service flow control, The terminal 201 performs unicast negotiation, and sends a unicast service flow to the terminal 201 according to the unicast negotiation result; the proxy call session control function entity 206 is configured to forward the request and response message between the terminal 201 and the serving call session control function entity 205;

The service call session control function entity 205 is configured to trigger a service request to the application server 202 to route the message.

In another scenario, the application server 202 is configured to initiate a resource request to the media resource control function entity 203 according to the service clearing from the terminal 201, where the service request carries the real-time streaming protocol media control channel parameter of the terminal; The service request response from the media resource control function entity 203 is routed to the terminal 201;

The media resource control function entity 203 is configured to interact with the media resource bearer entity 204 to return a service request response to the application server 202. The service request response carries the real-time streaming protocol media control channel parameter determined by the media resource bearer entity.

The media resource bearer entity 204 is configured to determine a real-time streaming protocol media control channel parameter, establish a real-time streaming protocol connection with the terminal 201 according to the determined real-time streaming protocol media control channel parameter, and negotiate media with the terminal 201 by using the real-time streaming protocol connection. Transmitting a parameter, establishing a multicast service flow; when the terminal 201 requests the service flow control, performing a unicast negotiation with the terminal 201, and transmitting a unicast service flow to the terminal 201 according to the unicast negotiation result;

The proxy call session control function entity 206 is configured to forward a request and response message between the terminal 201 and the serving call session control function entity 205;

The serving call session control function entity 205 is configured to trigger a service request to the application server 202 according to a triggering rule to route the message.

The media resource device device of the embodiment of the present invention is described below. The media resource device device of the embodiment of the present invention includes: a media resource control function entity 203 and a media resource bearer entity 204.

The media resource device device in the embodiment of the present invention is applicable to multiple scenarios.

Referring to FIG. 8, in a scenario, the media resource control function entity 203 is configured to interact with the media resource bearer entity 204 to return a service request response to the application server 202. The service request response includes at least a media resource bearer entity. Media transmission parameters;

The media resource bearer entity 204 is configured to determine a media transmission parameter, establish a multicast service flow with the terminal 201 according to the determined media transmission parameter, and when the terminal 201 requests the service flow control, The terminal 201 performs unicast negotiation, and sends a unicast service flow to the terminal 201 according to the unicast negotiation result.

The media resource control function entity 203 includes: a receiving unit 801, an interaction unit 802, and a response unit 803;

The receiving unit 801 is configured to receive a media resource request from an application server; the interaction unit 802 is configured to interact with the media resource bearer entity 204 according to the media resource request received by the receiving unit 801; The server 202 returns a service request response, where the service request response carries at least the media transmission parameter determined by the media resource bearer entity.

The media resource bearer entity 204 includes: a determining unit 804, configured to determine a media transmission parameter; a multicast unit 805, configured to establish a multicast service flow with the terminal 201 according to the determined media transmission parameter; a unicast unit 806, When the terminal 201 requests the service flow control, the terminal 201 performs unicast negotiation, and sends a unicast service flow to the terminal 201 according to the unicast negotiation result.

Referring to FIG. 9, in another scenario, the media resource control function entity 203 is configured to interact with the media resource bearer entity 204 to return a service request response to the application server 202. The service request response carries the media resource bearer entity. Real-time streaming protocol media control channel parameters;

The media resource bearer entity 204 is configured to determine a real-time streaming protocol media control channel parameter, establish a real-time streaming protocol connection with the terminal 201 according to the determined real-time streaming protocol media control channel parameter, and negotiate media with the terminal 201 by using the real-time streaming protocol connection. The transmission parameter is used to establish a multicast service flow. When the terminal 201 requests the service flow control, the terminal 201 performs unicast negotiation, and sends a unicast service flow to the terminal 201 according to the unicast negotiation result.

The media resource control function entity 203 includes: a receiving unit 901, an interaction unit 902, and a response unit 903;

The receiving unit 901 is configured to receive a media resource request from an application server; the interaction unit 902 is configured to interact with the media resource bearer entity 204 according to the media resource request received by the receiving unit 901; The server 202 returns a service request response, where the service request response carries at least a real-time streaming protocol media control channel parameter determined by the media resource bearer entity.

The media resource bearer entity 204 includes: a determining unit 904, configured to determine a real-time streaming protocol media control channel parameter; a connection establishing unit 905, configured to establish a real-time flow with the terminal 201 according to the determined real-time streaming protocol media control channel parameter a protocol connection; a multicast unit 906, configured to negotiate media transmission parameters with the terminal 201 by using the real-time streaming protocol connection, and establish a multicast service flow; 907. When the terminal 201 requests the service flow control, performs unicast negotiation with the terminal 201, and sends a unicast service flow to the terminal 201 according to the unicast negotiation result.

Claims

Rights request

A method for implementing a time-shifted TV service based on a next-generation network, comprising: a service request initiated by a terminal is routed to an application server by a call session control function entity; and an application server initiates a media resource entity according to the service request Resource request

2. The method for implementing a time-shifted television service based on a next-generation network according to claim 1, wherein the step of performing the unicast negotiation between the media resource entity and the terminal comprises:

The media resource control function entity locates the unicast program source corresponding to the program corresponding to the current multicast service flow and allocates system resources;

The media resource bearer entity determines transmission parameters and codec specifications of the unicast service flow.

The method for implementing a time-shifted television service based on a next-generation network according to claim 1, wherein the service request carries a real-time streaming protocol media control channel parameter of the terminal; and the service request response further carries the media The real-time streaming protocol media control channel parameter determined by the resource 7; the terminal and the media resource bearer entity before establishing the multicast service flow, the method further includes: the terminal establishing a real-time according to the determined real-time streaming protocol media control channel parameter and the media resource bearer entity Stream protocol connection.

The method for implementing a time-shifted TV service based on a next-generation network according to claim 3, further comprising: the terminal adopting real-time streaming protocol signaling as the play control signaling to perform unicast service flow control.

The method for implementing a time-shifted TV service based on a next-generation network according to claim 3 or 4, wherein the terminal requests to perform service flow control, specifically, the terminal sends a real-time flow protocol control instruction to the media resource bearer entity;

The unicast negotiation between the media resource entity and the terminal is performed by using a real-time streaming protocol between the media resource bearer entity and the terminal.

6. The method for implementing a time shift television service based on a next generation network according to claim 5, The method further includes: when the terminal requests the service flow control, the method further includes: using a session initiation protocol to activate or end the multicast service flow; in the process, the media resource control function entity uses the H.248 protocol to interact with the media resource bearer entity. control.

The method for implementing a time-shifted television service based on a next-generation network according to claim 6, further comprising:

The terminal and the media resource bearer entity end the unicast service flow by using a real-time streaming protocol;

The multicast service flow is activated by using the session initiation protocol; in this process, the media resource control function entity uses the H.248 protocol and the media resource bearer entity for interactive control.

The unicast negotiation between the media resource entity and the terminal is specifically: using the session initiation protocol to perform unicast transmission parameter negotiation.

The method for implementing a time-shifted TV service based on a next-generation network according to claim 8, wherein when the session initiation protocol is used for unicast transmission parameter negotiation, the method further includes: deactivating using a session initiation protocol or Ending the multicast service flow; in this process, the media resource control function entity uses the H.248 protocol and the media resource bearer entity for interactive control.

The method for implementing a time-shifted television service based on a next-generation network according to claim 9, further comprising:

The session initiation protocol is used to activate the multicast service flow to deactivate or stop the unicast service flow. In this process, the media resource control function entity uses the H.248 protocol and the media resource bearer entity for interactive control.

The method for implementing a time-shifted television service based on a next-generation network according to claim 1, wherein the service request carries a real-time streaming protocol media control channel parameter of the terminal; and the service request response further carries the media Real-time streaming protocol media control channel parameters determined by the resource control function entity;

Before the terminal establishes a multicast service flow with the media resource bearer entity, the method further includes: the terminal establishing a real-time flow protocol connection according to the determined real-time streaming protocol media control channel parameter and the media resource control function entity.

12. The method for implementing a time shift television service based on a next generation network according to claim 11, The method further includes: the terminal uses real-time streaming protocol signaling as the play control signaling to perform unicast service flow control; the media resource control function entity converts the real-time flow protocol control signaling into H.248 control signaling and media resource bearer The entity interacts, or the media resource control function entity acts as a real-time streaming protocol proxy, and forwards the real-time flow protocol control signaling to the media resource bearer entity for media resource control.

The method for implementing a time-shifted television service based on a next-generation network according to claim 1, wherein the terminal requests to perform service flow control, specifically, the terminal sends a control instruction to the media resource entity;

The unicast negotiation between the media resource entity and the terminal is specifically:

The session initiation protocol is used to activate or end the multicast service flow, and the real-time streaming protocol media control channel parameters are negotiated; in this process, the media resource control function entity uses the H.248 protocol and the media resource bearer entity for interactive control;

Establishing a real-time streaming protocol connection between the terminal and the media resource carrying functional entity;

Negotiation of unicast transmission parameters between the media resource bearer entity and the terminal.

The method for implementing a time-shifted TV service based on a next-generation network according to claim 13, wherein the media resource bearer entity and the terminal perform unicast transmission parameter negotiation specifically by using a real-time streaming protocol for unicast transmission. Parameter negotiation.

The method for implementing a time-shifted television service based on a next-generation network according to claim 14, further comprising:

Activate the multicast service flow using the session initiation protocol; the media resource control function entity is used in the process

The H.248 protocol and the media resource bearer entity perform interactive control.

The method for implementing a time-shifted TV service based on a next-generation network according to claim 13, further comprising: the terminal performing real-time streaming protocol signaling as the playback control signaling for unicast traffic control.

The method for implementing time-shifted television service based on a next-generation network according to claim 1, wherein the terminal requests to perform service flow control, specifically, the terminal sends a control instruction to the media resource entity;

The unicast negotiation between the media resource entity and the terminal specifically includes:

Use the session initiation protocol to activate or end the multicast service flow, and the media resource control function in the process The entity uses the H.248 protocol and the media resource bearer entity for interactive control;

The media resource control function entity and the terminal use the session initiation protocol to negotiate the real-time streaming protocol media control channel parameter; establish a real-time streaming protocol connection between the terminal and the media resource control function entity; and perform unicast transmission between the media resource bearer entity and the terminal Negotiation of parameters.

The method for implementing a time-shifted TV service based on a next-generation network according to claim 17, wherein the media resource bearer entity and the terminal negotiate the unicast transmission parameters, specifically: the terminal adopts real-time streaming protocol signaling. Performing unicast transmission parameter negotiation; the media resource control function entity converts the real-time flow protocol control signaling into H.248 control signaling to interact with the media resource bearer entity, or the media resource control function entity acts as a real-time streaming protocol proxy, and the real-time flow is performed. The protocol control signaling is forwarded to the media resource carrying entity for unicast transmission parameter negotiation.

The method for implementing a time-shifted TV service based on a next-generation network according to claim 17, further comprising: the terminal adopting real-time streaming protocol signaling as the play control signaling to perform unicast service flow control; and media resource control The functional entity converts the real-time flow protocol control signaling into H.248 control signaling to interact with the media resource bearer entity, or the media resource control function entity acts as a real-time flow protocol proxy, and forwards the real-time flow protocol control signaling to the media resource bearer entity. , for media resource control.

The method for implementing a time-shifted television service based on a next-generation network according to claim 13 or 17, wherein the media resource bearer entity and the terminal perform unicast transmission parameter negotiation, specifically adopting a session initiation protocol. Perform unicast transmission parameter negotiation.

The method for implementing a time-shifted television service based on a next-generation network according to claim 20, wherein when the session initiation protocol is used for unicast transmission parameter negotiation, the method further comprises: deactivating using a session initiation protocol Or end the multicast service flow; in this process, the media resource control function entity uses the H.248 protocol and the media resource bearer entity for interactive control.

The method for implementing a time-shifted television service based on a next-generation network according to claim 21, further comprising:

The method for implementing a time-shifted television service based on a next-generation network according to claim 1, wherein the terminal requests to perform service flow control, specifically, the terminal sends a control instruction to the media resource bearer entity; The unicast negotiation between the media resource bearer entity and the terminal is specifically:

The session initiation protocol is used to activate or end the multicast service flow, and the unicast transmission parameters are negotiated. In this process, the media resource control function entity uses the H.248 protocol and the media resource bearer entity for interactive control.

The method for implementing a time-shifted TV service based on a next-generation network according to claim 23, further comprising: the terminal adopting session initiation protocol signaling as the play control signaling to perform unicast service flow control; The media resource control function entity uses the H.248 protocol and the media resource bearer entity for interactive control.

The method for implementing a time-shifted TV service based on a next-generation network according to claim 24, wherein the step of using session initiation protocol signaling as the playback control signaling comprises: extending a session initiation protocol and / / Description of the control information and / or control information in the script language based on the Extensible Markup Language is carried in the Session Initiation Protocol Signaling.

The method for implementing a time-shifted TV service based on a next-generation network according to claim 25, further comprising: activating a multicast service flow by using a session initiation protocol, and deactivating or stopping the unicast service flow; The media resource control function entity uses the H.248 protocol and the media resource bearer entity for interactive control.

The method for implementing a time-shifted TV service based on a next-generation network according to claim 1, wherein the step of establishing a multicast service flow between the terminal and the media resource entity comprises:

The terminal establishes a multicast forwarding path with the media resource entity according to the determined media transmission parameter; the media resource entity sends the multicast service flow to the terminal.

The method for implementing a time-shifted television service based on a next-generation network according to claim 1, wherein the step of establishing a multicast service flow between the terminal and the media resource entity comprises:

The media resource entity records the type of service flow associated with the user.

The method for implementing time-shifted television service based on a next-generation network according to claim 1, wherein the media transmission parameter determined by the media resource entity comprises a multicast address for providing a service and port information.

30. A method for implementing a time-shifted TV service based on a next-generation network, comprising: a service request initiated by a terminal is routed to an application server by a call session control function entity; and the service request carries a real-time streaming protocol medium of the terminal. Control channel parameters;

The application server initiates a resource request to the media resource control function entity according to the service request; After the media resource control function entity interacts with the media resource bearer entity, the service request response is returned to the application server; the service request response carries the real-time streaming protocol media control channel parameter determined by the media resource bearer entity;

The application server routes the service request response to the terminal through a call session control function entity;

The method for implementing a time-shifted TV service based on a next-generation network according to claim 30, further comprising: the terminal adopting real-time streaming protocol signaling as the play control signaling to perform unicast service flow control.

The method for implementing time-shifted television service based on a next-generation network according to claim 30 or 31, wherein the terminal requests to perform service flow control, specifically, the terminal sends a real-time flow protocol control instruction to the media resource bearer entity;

The unicast negotiation between the media resource bearer entity and the terminal is specifically:

The terminal and the media resource bearer entity use a real-time streaming protocol to activate or end the multicast service flow, and perform unicast transmission parameter negotiation.

33. A method for implementing a time-shifted TV service based on a next-generation network, the method comprising: a service request initiated by a terminal is routed to an application server by a call session control function entity; and the service request carries a real-time streaming protocol media of the terminal Control channel parameters;

The application server routes the service request response to the terminal through a call session control function entity; And establishing, by the terminal, a real-time streaming protocol connection with the media resource control function entity according to the determined real-time streaming protocol media control channel parameter;

The terminal establishes a multicast service flow by using the real-time streaming protocol connection to negotiate media transmission parameters with the media resource control function entity and the media resource bearer entity;

The method for implementing a time-shifted TV service based on a next-generation network according to claim 33, further comprising: the terminal adopting real-time streaming protocol signaling as the play control signaling to perform unicast service flow control; and media resource control The functional entity converts the real-time flow protocol control signaling into H.248 control signaling to interact with the media resource bearer entity, or the media resource control function entity acts as a real-time flow protocol proxy, and forwards the real-time flow protocol control signaling to the media resource bearer entity. , for media resource control.

The method for implementing time-shifted TV service based on a next-generation network according to claim 33 or claim 34, wherein the terminal requests to perform service flow control, specifically, the terminal sends a real-time flow protocol control instruction to the media resource control function entity. ;

The terminal uses a real-time streaming protocol to activate or end the multicast service flow, and performs unicast transmission parameter negotiation; the media resource control function entity converts the real-time flow protocol control signaling into H.248 control signaling to interact with the media resource bearer entity, or The media resource control function entity acts as a real-time streaming protocol proxy, and forwards the real-time flow protocol control signaling to the media resource bearer entity to perform broadcast transmission parameter negotiation.

36. A system for implementing a time shift television service based on a next generation network, comprising: an application server, a media resource control function entity, a media resource bearer entity, a proxy call session control function entity, and a service called a session control function entity; among them,

The application server is configured to initiate a resource request to the media resource control function entity according to the service request from the terminal, where the service request carries at least the media transmission parameter of the terminal; and the service request response from the media resource control function entity is routed to Terminal

The media resource bearer entity is configured to determine media transmission parameters, according to the determined media transmission parameter And establishing a multicast service flow with the terminal; when the terminal requests the service flow control, the terminal performs unicast negotiation, and sends a unicast service flow to the terminal according to the unicast negotiation result;

The proxy call session control function entity is configured to forward a request and response message between the terminal and the service call session control function entity;

37. A system for implementing a time shift television service based on a next generation network, comprising: an application server, a media resource control function entity, a media resource bearer entity, a proxy call session control function entity, and a service call session control function entity; among them,

The application server is configured to initiate a resource request to the media resource control function entity according to the service request from the terminal, where the service request carries a real-time streaming protocol media control channel parameter of the terminal; and the content from the media resource control function entity The service request response is routed to the terminal;

The media resource bearer entity is configured to determine a real-time streaming protocol media control channel parameter, establish a real-time streaming protocol connection with the terminal according to the determined real-time streaming protocol media control channel parameter, and use the real-time streaming protocol connection to negotiate media and body transmission with the terminal. The parameter establishes a multicast service flow; when the terminal requests service flow control, performs unicast negotiation with the terminal, and sends a unicast service flow to the terminal according to the unicast negotiation result; the proxy call session control function entity is used to forward the terminal and the service call a request and response message between the session control function entities;

38. A media resource device device, comprising: a media resource control function entity and a media resource bearer entity; wherein the media resource control function entity is configured to interact with the media resource bearer entity to return a service request response to the application server The service request response carries at least the media transmission parameter determined by the media resource bearer entity;

The media resource bearer entity is configured to determine a media transmission parameter, establish a multicast service flow with the terminal according to the determined media transmission parameter, and perform unicast with the terminal when the terminal requests the service flow control Negotiation, sending a unicast service flow to the terminal according to the unicast negotiation result.

The media resource control device according to claim 38, wherein the media resource control function entity comprises: a receiving unit, configured to receive a media resource request from an application server; and an interaction unit, configured to receive according to the The media resource request received by the unit interacts with the media resource bearer entity; the response unit is configured to: return a service request response to the application server, where the service request response carries at least the media transmission parameter determined by the media resource bearer entity;

The media resource bearer entity includes: a determining unit, configured to determine a media transmission parameter; a multicast unit, configured to establish a multicast service flow with the terminal according to the determined media transmission parameter; and a unicast unit, configured to request at the terminal When the service flow control is performed, the terminal performs unicast negotiation, and sends a unicast service flow to the terminal according to the unicast negotiation result.

40. A media resource device device, comprising: a media resource control function entity and a media resource bearer entity;

The media resource control function entity is configured to interact with the media resource bearer entity to return a service request response to the application server; the service request response carries the real-time stream protocol media control channel parameter determined by the body resource bearer entity;

The media resource bearer entity is configured to determine a real-time streaming protocol media control channel parameter, establish a real-time streaming protocol connection with the terminal according to the determined real-time streaming protocol media control channel parameter, and negotiate the media transmission parameter with the terminal by using the real-time streaming protocol connection, A multicast service flow is established. When the terminal requests service flow control, the terminal performs unicast negotiation, and sends a unicast service flow to the terminal according to the unicast negotiation result.

The media resource control device according to claim 40, wherein the media resource control function entity comprises: a receiving unit, configured to receive a media resource request from an application server; and an interaction unit, configured to receive according to the The media resource request received by the unit interacts with the media resource bearer entity; the response unit is configured to return a service request response to the application server, where the service request response carries at least the real-time streaming protocol media control channel parameter determined by the media resource bearer entity;

The media resource bearer entity includes: a determining unit, configured to determine a real-time streaming protocol media control channel parameter; a connection establishing unit, configured to establish a real-time streaming protocol connection with the terminal according to the determined real-time streaming protocol media control channel parameter; a broadcast unit, configured to negotiate a media transmission parameter with the terminal by using the real-time streaming protocol connection, and establish a multicast service flow; and a unicast unit, configured to perform unicast negotiation with the terminal when the terminal requests service flow control, according to the unicast The result of the negotiation sends a unicast service flow to the terminal.