CN102196581A - Method and system for configuring downlink subframes in return link - Google Patents
Method and system for configuring downlink subframes in return link Download PDFInfo
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Abstract
The invention discloses a method and system for configuring downlink subframes in a return link, which can be implemented based on compatibility with existing protocols, and used to improve the configuration flexibility and the system performances. The method for configuring the downlink subframes of a relay node comprises the following steps: sending link information to a base station by a relay node; after the base station receives the link information, configuring or reconfiguring the downlink subframes in the return link; and monitoring scheduling of the base station at the downlink subframes in the return link by the relay node.
Description
Technical field
The present invention relates to moving communicating field, relate in particular to a kind of collocation method and system of back haul link descending sub frame.
Background technology
In order to satisfy the demand that growing big bandwidth high-speed mobile inserts, third generation partner program (Third Generation Partnership Projects, abbreviation 3GPP) releases senior Long Term Evolution (Long-Term Evolution advance is called for short LTE-Advanced) standard.LTE-Advanced is for Long Term Evolution (Long-Term Evolution, abbreviation LTE) evolution of system has kept the core of LTE, adopt a series of technology that frequency domain, spatial domain are expanded on this basis, to reach purposes such as improving the availability of frequency spectrum, increase power system capacity.Wireless relay (Relay) technology promptly is one of technology among the LTE-Advanced, is intended to the coverage of Extended Cell, reduces the area, dead angle in the communication, balanced load, shift the business of hot zones, saving subscriber equipment (User Equipment is called for short UE) is the transmitting power of terminal.As shown in Figure 1, increase some new via nodes (Relay-Node is called for short RN) between original base station (Donor-eNB) and UE, these newly-increased RN and Donor-eNB carry out wireless connections.Wherein, the Radio Link between Donor-eNB and the RN is called back haul link (backhaul link can represent with Un), and the Radio Link between RN and the UE is called access link (access link can represent with Uu).Downlink data arrives Donor-eNB earlier, passes to RN then, and RN transfers to UE again, otherwise then up.
In order to dispose the resource of back haul link, defined special-purpose Physical Downlink Control Channel (the Relay-node Physical Downlink Control CHannel of RN, be called for short R-PDCCH), special-purpose Physical Downlink Shared Channel (the Relay-node Physical Downlink Shared CHannel of RN, be called for short R-PDSCH) and the special-purpose Physical Uplink Shared Channel of RN (Relay-node Physical Uplink SharedCHannel is called for short R-PUSCH).The R-PDCCH channel resource can be part of O FDM symbol or the whole OFDM symbol that is used for the subframe of back haul link downlink transfer.The base station utilizes R-PDCCH dynamic or semi-staticly for via node distributes R-PDSCH resource and R-PUSCH resource, and wherein, the R-PDSCH resource is used to transmit the downlink data of back haul link, and the R-PUSCH resource is used to transmit the upstream data of back haul link.RN (as the UE connection status time) can monitor PDCCH and go up the descending assignment (PDSCH resource) of base station indication and uplink authorization (PUCCH and/or PUSCH resource) etc., and in the transfer of data between realization via node and the base station on corresponding Physical Downlink Shared Channel and the Physical Uplink Shared Channel.RN (when relay function enables connection status) also can monitor R-PDCCH and go up the descending assignment (R-PDSCH resource) of base station indication and uplink authorization etc., and in the transmission between realization via node and the base station on corresponding R-PDSCH and the R-PUSCH.Simultaneously, via node is indicating downlink assignment and uplink authorization etc. on the PDCCH of access link, and in the transmission that realizes on corresponding PDSCH and the PUSCH between via node and the subscriber equipment, thereby avoid transmission between via node and the base station and the transmission collision between via node and the subscriber equipment.
Via node can be in a kind of in the following state:
Idle condition: RN is in idle condition when initially powering on, also be in idle condition behind the Radio Link reconstruction failure.Have all or part of identical functions with the UE that is in idle condition when RN is in idle condition, as obtain the system information function, measurement function and cell selecting/reselection functionality etc.
When being in as the connection status of UE, the connection status as UE: RN has all or part of identical functions with the UE that is in connection status, as obtain the system information function, measurement function, reporting functions, handoff functionality carries out data-transformation facility etc. by control channel (PDCCH) and shared channel (PDSCH or PUSCH) between base station and RN.The RN that is in as the connection status of UE does not possess relay function, promptly can't make subscriber equipment pass through this RN access network.
Relay function enables connection status (or via node operating state): RN possesses relay function under this state, and promptly RN has between RN and base station (Donor-eNB), and the relay function that carries out transfer of data between the UE of RN and its management.Particularly, between base station and RN, relay function comprises and obtains the system information function, measures and the reporting measurement reports function, handoff functionality carries out the function of transfer of data etc. by Dedicated Control Channel (R-PDCCH) and shared channel (R-PDSCH or R-PUSCH).When RN is in relay function and enables connection status, can also manage the sub-district that belongs to this RN, manage the subscriber equipment in this sub-district.Between RN and UE, relay function comprises the system information function that sends RN, the measuring process of management user device, the handoff procedure of management user device carries out function of transfer of data etc. by control channel (PDCCH) and shared channel (PDSCH/PUSCH) between RN and subscriber equipment.
The attribute that above-mentioned Status Name and corresponding definition only have in different phase for clear and definite via node, Status Name may be different in other documents, for example be initial power-up state and operating state, wherein initial power-up state comprises above-mentioned idle condition and as the connection status of UE.
RN can connect the process of setting up by RRC to be finished from idle condition to the conversion as the connection status of UE, can also connect dispose procedure by RRC, finishes the conversion that is converted to idle condition from the connection status as UE.
The access procedure of via node state comprises following content:
(1) after via node (RN) initially powers on, implement Cell searching, select the sub-district under the Donor eNB, read its system message, this moment, via node was in idle condition.Because the main purpose of via node is for the subscriber equipment in its coverage provides service, thus via node be in time of idle condition may be very short.
(2) this via node is selected Access Preamble at random according to the random access resource in the system message, initiate to insert at random, set up the RRC connection and (just set up SRB (Signal Radio Bearer, Signaling Radio Bearer)), network side carries out authentication and encryption to it then, in authentication with after encrypting successfully, network side connects by RRC reshuffles (RRC Connection Reconfiguration) is used for transfer of data for this via node configuration Data Radio Bearer (Data Radio Bearer is called for short DRB).In this process, in case the access at random that via node is initiated success, this via node just is in the connection status as UE, this via node need monitor the PDCCH that the base station issues, according to the base station is Radio Network Temporary Identifier (the Radio Network Temporary Identifier of its distribution, be called for short RNTI, can comprise Cell RNTI, SPS RNTI etc.) detect one's own PDCCH and/or be positioned at the Physical Downlink Shared Channel of same subframe.Via node can be by carrying the information informing base station in space interface signaling, what this time insert is via node but not domestic consumer's equipment, also can perhaps can also pass through backstage (Operation﹠amp by the information of core net to the authentication acquisition via node access of this via node; Maintenance is called for short O﹠amp; M) know the information that via node inserts.
(3) after via node has been set up DRB, O﹠amp; The M system sends configuration data to this via node, so that via node can be realized relay function, for the subscriber equipment of its coverage provides service.Loading of configuration data comprises the parameter information of via node configuration self system information such as area identification (trackingAreaCode), the sign (Cell Identity) of sub-district, the parameter of cell selecting/gravity treatment, may comprise that also via node is in relay function and enables required configuration parameter of connection status such as R-PDCCH configuration information etc.After via node obtained these configuration informations, the necessary parameter of initialization was prepared for providing the sub-district to serve with relay function, and via node needs initialization relevant counter, state variable, system information of subdistricts etc. that reasonable disposition provides.
When access link and back haul link are shared same frequency range, via node need keep being connected (upstream data in the back haul link is mutual and downlink data is mutual) with Donor-eNB on the one hand, need again on the other hand to keep being connected (upstream data in the access link is mutual and downlink data is mutual) with subscriber equipment, the conflict that this may cause via node to be handled, in order to address this problem, special introducing back haul link descending sub frame is Fake MB SFN (Fake Multicast Broadcast Single FrequencyNetwork, pseudo-Multicast Broadcast Single Frequency Network) subframe, the just descending sub frame of base station scheduling via node.In Fake MBSFN subframe, via node and Donor-eNB carry out data interaction, and the subscriber equipment in access link sends signal, and via node need broadcast Fake MBSFN sub-frame information so that subscriber equipment transmitting at this subframe trunk monitoring node not.When via node was in relay function and enables connection status, in Fake MBSFN subframe, Donor-eNB dispatched via node with R-PDCCH.But the collocation method that does not also have a kind of MBSFN of Fake preferably subframe at present can either guarantee that Donor-eNB on-the-fly modifies Fake MBSFN configuration, considers the variation of via node bearer service again.
Summary of the invention
The technical problem to be solved in the present invention provides a kind of method and system of base station configuration via node descending sub frame, finishes on the basis of compatibility protocols having, increases configuration flexibility, improves systematic function.
For solving the problems of the technologies described above, the invention provides a kind of collocation method of via node descending sub frame, comprising:
Via node sends link information to the base station, after described link information is received in described base station, disposes or reshuffle the back haul link descending sub frame, and described via node is monitored the scheduling of base station at the back haul link descending sub frame.
Further, described link information comprises one or more of following information: link traffic information, link load information, the configuration information of the back haul link descending sub frame of recommending, the link temporal information, wherein: described link traffic information comprises: the information that the traffic carrying capacity of access link and/or back haul link changes; Described link load information is meant, access link Radio Resource information on load; The configuration information of the back haul link descending sub frame of described recommendation is meant that the configuration of the back haul link descending sub frame of via node suggestion comprises: the quantity of the distribution of back haul link descending sub frame and/or back haul link descending sub frame; When described link temporal information is used for base station to determine dispatches this via node in the described configuration or the back haul link descending sub frame of reshuffling.
Further, the distribution cycle that also comprises the back haul link descending sub frame in the configuration information of the back haul link descending sub frame of described recommendation.
Further, the distribution that is distributed as complete back haul link descending sub frame of described back haul link descending sub frame, or only comprise the distribution of that part of back haul link descending sub frame that changes.
Further, described link temporal information is in the following temporal information any one group: the side-play amount of the System Frame Number of access link and back haul link (SFN); The SFN of corresponding access link when via node sends link information; The SFN and the sub-frame information of corresponding access link when via node sends link information; The modification cycle of the system message of access link; The modification cycle of the deviate of the SFN of access link and back haul link and the system message of access link; The application time that via node is recommended.
Further, described base station configuration or reshuffle the back haul link descending sub frame and be meant: described base station sends the configuration information of back haul link descending sub frame and/or uses the temporal information of this configuration information to via node by space interface signaling.
Further, the configuration information of described back haul link descending sub frame is meant the distribution of back haul link descending sub frame, comprises that complete back haul link descending sub frame distributes, or the distribution of that part of back haul link descending sub frame that changes.
Further, after described via node is received the configuration information of the back haul link descending sub frame that the base station sends, use described back haul link descending sub frame configuration in the following time: the predefined time; The time of the described configuration information of application that the base station sends; The application time that via node is recommended; Use immediately.
Further, the described predefined time is meant that the next one of the system message of access link revises the initial moment or the default time of agreement in cycle.
Further, the configuration of using described back haul link descending sub frame of described via node is meant: via node is at the Physical Downlink Control Channel of described back haul link descending sub frame trunk monitoring node special use.
Further, described via node is in the configuration information of the subscriber equipment of connected state about the back haul link descending sub frame by the dedicated signaling notice.
Further, described via node sends link information to the base station and comprises by space interface signaling and send link information to the base station; Perhaps send to core net, send link information by core net to the base station again by the Non-Access Stratum signaling.
For solving the problems of the technologies described above, the present invention also provides a kind of configuration-system of via node descending sub frame, comprises via node and base station, wherein:
Described via node comprises the link information sending module, receiver module and monitoring module, wherein:
Described link information sending module is used for sending link information to the base station;
Described receiver module is used to receive the configuration information of the back haul link descending sub frame that the base station sends;
Described monitoring module is used for monitoring at the back haul link descending sub frame of described base station configuration the scheduling of base station;
Described base station comprises receiver module, configuration module and sending module, wherein:
Described receiver module is used to receive the link information that described via node sends;
Described configuration module is used for disposing or reshuffle the back haul link descending sub frame according to described link information after receiver module receives the link information of described via node transmission;
Described sending module, be used for will configuration or the configuration information of the back haul link descending sub frame of reshuffling send to via node.
The present invention changes less to existing agreement, and realizes simply flexible configuration.By the mechanism that reports of via node, make Donor-eNB can understand the load variations of via node in real time, on-the-fly modify Fake MBSFN configuration.
Description of drawings
Fig. 1 is the system configuration schematic diagram of available technology adopting wireless relay technology;
Fig. 2 is the formation schematic diagram of radio frames in the LTE system;
Fig. 3 is the schematic flow sheet of the embodiment of the invention.
Embodiment
The technical problem to be solved in the present invention is after via node initial configuration success, after being in normal operating conditions or relay function and enabling connection status, provides a kind of method and system of reshuffling via node at the back haul link descending sub frame.
Inventive concept of the present invention is: via node sends link information to the base station, after described link information is received in described base station, disposes or reshuffle the back haul link descending sub frame, and described via node is monitored the scheduling of base station at the back haul link descending sub frame.
Described via node can initiatively send link information to the base station, perhaps based on the triggering of base station, is sent by the trend base station.It can be to send by space interface signaling that described via node initiatively sends link information to the base station, perhaps sends to core net by the Non-Access Stratum signaling, is sent to the base station by core net again.
Described link information comprises one or more of following information: link traffic information, link load information, the configuration information of the back haul link descending sub frame of recommendation, link temporal information.Wherein:
Link traffic information comprises: the information that the traffic carrying capacity of access link and/or back haul link changes;
Link load information is meant, access link Radio Resource information on load;
The configuration information of the back haul link descending sub frame of recommending is meant, the configuration of the back haul link descending sub frame of via node suggestion, described configuration comprises the distribution of back haul link descending sub frame and/or the quantity of back haul link descending sub frame, perhaps can also comprise the distribution cycle of back haul link descending sub frame.Particularly, the distribution of described back haul link descending sub frame can be the distribution of complete back haul link descending sub frame, or only comprise the distribution of that part of back haul link descending sub frame that changes, preferably, when carrying complete distributed intelligence, can carry back haul link descending sub frame quantity information, carry back haul link descending sub frame quantity information when carrying the part distributed intelligence simultaneously.In the TDD system, owing to the selection that can be used as the back haul link descending sub frame and few, therefore can be only by informing that quantity makes the base station know the distribution of back haul link descending sub frame.
When the link temporal information dispatches this via node at the back haul link descending sub frame of new configuration if being used for base station to determine, promptly when the base station to determine via node uses the back haul link descending sub frame of described new configuration.Described link temporal information can be any a group in the following temporal information: the side-play amount of the SFN of access link and back haul link (System Frame Number, System Frame Number); The SFN of corresponding access link when via node sends link information; The SFN and the sub-frame information of corresponding access link when via node sends link information; The modification cycle of the system message of access link; The modification cycle of the deviate of the SFN of access link and back haul link and the system message of access link; The application time that via node is recommended.
Further, can directly make a strategic decision according to above-mentioned information in the base station, perhaps uses the new time of disposing the back haul link descending sub frame according to above-mentioned information and in conjunction with the Given information decision-making.For example, if when the SFN of back haul link and access link synchronous, via node reports the modification week after date of the system message of access link, the base station can send the configuration information of described back haul link descending sub frame in the current modification cycle, and the indication via node is used this configuration in the next one modification cycle.For another example, the modification cycle of the system message of the known access link in base station, (via node reported, perhaps the modification cycle of the system message of access link is identical with the modification cycle of the system message of back haul link), then the base station also can calculate the time of the new configuration of in back haul link application according to the side-play amount of the SFN of access link and back haul link.
Described base station configuration or reshuffle the back haul link descending sub frame and be meant: described base station sends the configuration information of back haul link descending sub frame and/or uses the temporal information of this configuration information to via node by space interface signaling.The configuration information of described back haul link descending sub frame is meant the distribution of back haul link descending sub frame, can be that complete back haul link descending sub frame distributes, or the distribution of that part of back haul link descending sub frame that changes.The time of application configuration information can be by base station sets, and perhaps the time that via node is recommended is adopted in the base station, perhaps adopts predefined mode to set.Under first kind of situation, i.e. the situation of base station sets, the base station is by carrying the time of SFN and/or sub-frame information notice via node application configuration information.Under back two kinds of situations, the base station is in configuration or when reshuffling the back haul link descending sub frame, the temporal information that can not carry described this configuration information of application.
After via node is received the configuration information of the back haul link descending sub frame that the base station sends, scheme one, if there is setting in advance via node and base station, then via node is used the configuration of described back haul link descending sub frame in the predefined time; The temporal information that the configuration of using is arranged in the configuration information that scheme two, base station send, the then via node configuration of using described back haul link descending sub frame in the time that this applications is disposed; Scheme three, via node includes the scheduling time of recommendation in the link information that sends to the base station, and the base station does not have the time of feedback application configuration, and then via node is in its configuration of using described back haul link descending sub frame to link time (being the application time of its recommendation) of base station transmission; Scheme four, via node are used the configuration of described back haul link descending sub frame immediately.
Preferably, the described predefined time is meant that the next one of the system message of access link revises the initial moment or the default time of agreement in cycle.
The configuration that via node is used described back haul link descending sub frame is meant: via node is at the Physical Downlink Control Channel of described back haul link descending sub frame trunk monitoring node special use.Preferably, via node also is in the configuration information of the subscriber equipment of connected state about the back haul link descending sub frame by the dedicated signaling notice.The purpose of notifying user equipment is to allow subscriber equipment know the variation of back haul link descending sub frame fast, does not monitor downstream signal in the back haul link descending sub frame.
Realize the configuration-system of said method, comprise via node and base station, wherein:
Described via node comprises the link information sending module, receiver module and monitoring module, wherein:
Described link information sending module is used for sending link information to the base station;
Described receiver module is used to receive the configuration information of the back haul link descending sub frame that the base station sends;
Described monitoring module is used for monitoring at the back haul link descending sub frame of described base station configuration the scheduling of base station.
Described base station comprises receiver module, configuration module and sending module, wherein:
Described receiver module is used to receive the link information that described via node sends;
Described configuration module is used for disposing or reshuffle the back haul link descending sub frame according to described link information after receiver module receives the link information of described via node transmission;
Described sending module, be used for will configuration or the configuration information of the back haul link descending sub frame of reshuffling send to via node.
Below by a plurality of embodiment process in detail.Described method can be applied to FDD system and TDD system.Hereinafter described the Status Name of via node only for the explanation via node at attribute that different phase had.
Embodiment one
After via node inserts Donor-eNB (host base station or abbreviation base station) jurisdiction district, be converted into connection status from idle condition as UE, Donor-eNB is configuration information of its configuration via node special use, comprises one or more in the following information: the special-purpose Physical Downlink Control Channel configuration information of via node, the special-purpose Physical Downlink Shared Channel configuration information of via node, the special-purpose Physical Uplink Shared Channel configuration information of via node, the configuration information of the dispatch request of via node special use, the information of back haul link descending sub frame (being the information of Fake MBSFN subframe), the sign of via node special use (Radio Network Temporary Identifier of via node is RN-RNTI).After via node obtains this part configuration, enable connection status (or via node operating state) being transformed into relay function sometime, via node be transformed into relay function enable connection status time can by Donor-eNB adopt the method for dedicated signaling notice or adopt the agreement time predefined method (for example agreement regulation via node sometime or be transformed into relay function after receiving certain bar configuration signal and enable connection status).Enable connection status at relay function, via node is R-PDCCH at the Physical Downlink Control Channel of the via node special use that Fake MBSFN subframe monitoring Donor-eNB issues.In the present embodiment, access link and back haul link are synchronous (synchronized) of SFN (SystemFrame Number, System Frame Number), i.e. the SFN of the sub-district of via node administration is identical with the SFN of the Donor-eNB jurisdiction district of its access.
In the LTE system, the value of SFN is 0 to 1023, the corresponding radio frames (radioframe) of each SFN, comprise 10 milliseconds, these 10 milliseconds are divided into 10 subframes (Sub-frame, the numbering of subframe from 0 to 9), 1 millisecond of each subframe again, be divided into two time slots (slot) again, the composition structure of SFN is referring to Fig. 2.
Donor-eNB is respectively subframe 2 and subframe 7 for the Fake MBSFN subframe of this via node configuration comprises two subframes.Be these two subframes of each radio frames, Donor-eNB will dispatch this via node with R-PDCCH, and particularly, in subframe 2 and 7, the part of O FDM symbol in the subframe is used for the scheduling of R-PDCCH.Donor-eNB reshuffles the Fake MBSFN subframe that signaling disposes this via node by space interface signaling such as RRC connection.
Via node and Donor-eNB carry out process that Signalling exchange realizes reshuffling Fake MBSFN subframe as shown in Figure 3, comprising:
Step 110, via node initiatively sends link information to the base station;
Via node provides service for the subscriber equipment of its coverage, increase along with the increase of the subscriber equipment that is in connected state or the traffic carrying capacity of subscriber equipment (Traffic), via node finds that the subframe 2 and 7 of existing back haul link is not enough to the increase of supporting business amount, via node sends the request of reshuffling by space interface signaling to Donor-eNB and (connects reconfiguration request as RRC signaling RRC, also can be other signaling), in this request, include link information.
Link information can be the information (or reason) that subscriber equipment increases or traffic carrying capacity increases, or the information on load of access link Radio Resource (behaviour in service of Radio Resource), or the information of recommendation increase/modification Fake MBSFN subframe (can be complete new Fake MBSFN subframe distribution information, perhaps only be the Fake MBSFN subframe distribution that changes, or the variation numerical value of Fake MBSFN subframe).
For example, if the newly-increased descending sub frame of request, described complete new Fake MBSFN subframe distribution information can be subframe 2,7,8; Only be that the Fake MBSFN subframe distribution that changes is only to comprise newly-increased subframe 8, the variation numerical value of Fake MBSFN subframe is 1.
Step 120 after described link information is received in described base station, is reshuffled the back haul link descending sub frame;
After Donor-eNB receives this request, reshuffle back haul link descending sub frame (Fake MBSFN subframe), and send the configuration information of reshuffling Fake MBSFN subframe to this via node by space interface signaling.Donor-eNB can connect by RRC signaling such as RRC and reshuffles signaling (RRC connectionReconfiguration) or other newly-increased RRC signalings send the configuration information of new Fake MBSFN subframe to via node.
Can comprise complete Fake MBSFN subframe distribution information in the configuration information, also can only be the Fake MBSFN sub-frame information that increases or change.
Step 130, dispatch via node at the back haul link descending sub frame base station.
After via node is received new Fake MBSFN subframe configuration information, just use this configuration (apply or update the configuration) immediately, promptly via node is just monitored R-PDCCH in new Fake MBSFN subframe.Preferably, after via node is received new Fake MBSFN subframe configuration information, return to reshuffle to Donor-eNB and finish message.Via node can return reshuffle finish message after, use new Fake MBSFN subframe again.
At access link, via node need be in the system message of its coverage cell the FakeMBSFN sub-frame information of broadcast configuration so that subscriber equipment is known the signal that needn't monitor or survey Fake MBSFN subframe.Appearance for fear of stationary problem, via node is notified the subscriber equipment that is in connection status in the access link by dedicated signaling after receiving new Fake MBSFN sub-frame configuration immediately, upgrade its configuration information about MBSFN, perhaps via node avoids subscriber equipment to use the subframe that belongs to Fake MBSFN according to new Fake MBSFN subframe distribution rational management subscriber equipment; For the subscriber equipment that is in Idle state in the via node coverage, about the configuration information of MBSFN, the method for update system message is identical with method in the existing protocol, repeats no more herein in the via node update system message.
Embodiment two
After via node inserts the Donor-eNB jurisdiction district, be in relay function behind the acquisition configuration parameter and enable connection status.Donor-eNB is respectively subframe 3 and subframe 8 for the Fake MBSFN subframe of this via node configuration comprises two subframes.Be these two subframes of each radio frames, Donor-eNB will dispatch this via node with R-PDCCH, particularly, in subframe 3 and 8, can have only part of O FDM symbol in the subframe to be used for the scheduling of R-PDCCH.Donor-eNB reshuffles the Fake MBSFN subframe that signaling disposes this via node by space interface signaling such as RRC connection.In the present embodiment, access link and back haul link are that SFN is synchronous.
Via node and Donor-eNB carry out Signalling exchange and realize that the process of reshuffling Fake MBSFN subframe comprises:
Step 220, via node initiatively sends link information to the base station;
Via node provides service for the subscriber equipment of its coverage, increase along with the increase of the subscriber equipment that is in connected state or the traffic carrying capacity of subscriber equipment (Traffic), via node finds that the subframe 3 and 8 of existing back haul link is not enough to the increase of supporting business amount, via node sends the request of reshuffling by space interface signaling to Donor-eNB, includes link information in this request.
Link information can be the reason that subscriber equipment increases or traffic carrying capacity increases, or access link Radio Resource information on load, or the information (can indicate the Fake MBSFN subframe that needs increase maybe to need the sub-frame number that increases herein) of recommendation increase/modification Fake MBSFN subframe.
Step 220 after described link information is received in described base station, is reshuffled the back haul link descending sub frame;
After Donor-eNB receives this request, reshuffle Fake MBSFN subframe, and send the configuration information of reshuffling Fake MBSFN subframe to this via node by space interface signaling.Donor-eNB can reshuffle signaling (RRC connection Reconfiguration) by RRC signaling such as RRC connection and send new Fake MBSFN subframe configuration information.
Described configuration information can include only newly-increased Fake MBSFN sub-frame information, or the cycle information of complete Fake MBSFN subframe distribution information and Fake MBSFN (radio frameAllocation Period).The distribution of Fake MBSFN subframe and cycle information are called as the pattern (pattern) of Fake MBSFN subframe in the present embodiment.Illustrate as followsly, in 40 milliseconds cycle, the subframe 3,7 and 8 in first 10 milliseconds is used for Fake MBSFN, subframe 3,7 in second 10 milliseconds is used for Fake MBSFN, and the subframe 3,7 and 8 in the 3rd 10 milliseconds is used for Fake MBSFN, and the subframe 3 in the 4th 10 milliseconds is used for Fake MBSFN, the pattern of Fake MBSFN subframe can be expressed as 3,7,8,3,7,3,7,8,3.
The cycle information of Fake MBSFN subframe can adopt signaling indication or predefined mode to notify via node.Send to via node at Donor-eNB and to comprise also in the signaling reshuffle Fake MBSFN subframe that via node uses the temporal information of new Fake MBSFN subframe, can be that corresponding SFN and/or sub-frame information (radio frames that can be this SFN correspondence begins, or the next radio frames of this SFN correspondence begins) are used in new FakeMBSFN configuration.Need to prove that temporal information can be an absolute time information, also can be relative time information, and absolute time can be the SFN and/or the sub-frame information of back haul link; Relative time can be that Donor-eNB sends a period of time reshuffle after the signaling or via node and acknowledges receipt of a period of time of reshuffling after the signaling.
Step 230, dispatch via node at the back haul link descending sub frame base station, and via node is reshuffled the moment of temporal information indication and is used this configuration reshuffling application that signaling comprises, promptly monitors the scheduling of base station.
After via node is received new Fake MBSFN sub-frame information, notify the change (being new Fake MBSFN sub-frame configuration) of the user device system information in its coverage by beep-page message, after subscriber equipment is received beep-page message, label (systemInfoValueTag) by the changing system information in the check system message blocks 1 (SystemInformationBlockTypel), know that System information block 2 changes (configuration information of MBSFN is in System information block 2 in the existing protocol), subscriber equipment will read new System information block 2 so that upgrade configuration information in time in the modification cycle of next system message (modification period).Need to prove that the base station can be at twice by the new Fake MBSFN of space interface signaling configuration, be the new Fake MBSFN subframe of configuration the first time, is for the second time the temporal information of using this FakeMBSFN subframe.
In the present embodiment, the temporal information that Donor-eNB comes into force by configuration Fake MBSFN is to prevent the stationary problem of access link and back haul link.Also can adopt predefined time configuration information, in the signaling of reshuffling Fake MBSFN, do not comprise temporal information, and use the temporal information of this configuration according to agreement regulation via node, for example the 4th radio frames after receiving this signaling comes into force, perhaps come into force in the initial moment in modification cycle of the next system message of back haul link, perhaps come into force in the initial moment in modification cycle of N system message of back haul link, perhaps come into force in the initial moment in modification cycle of the next system message of access link, after via node is received the signaling of reshuffling Fake MBSFN, use this configuration in the predefined time.
Embodiment three
After via node inserts the Donor-eNB jurisdiction district, be in relay function behind the acquisition configuration parameter and enable connection status.Donor-eNB is respectively subframe 2, subframe 3, subframe 7 and subframe 8 for the Fake MBSFN subframe of this via node configuration comprises four subframes.Be these four subframes of each radio frames, Donor-eNB will dispatch this via node with R-PDCCH.In the present embodiment, the SFN of access link and back haul link is not synchronous, and promptly the SFN of Donor-eNB jurisdiction district is different with the SFN of the sub-district of via node administration.
Via node and Donor-eNB carry out Signalling exchange and realize that the process of reshuffling Fake MBSFN subframe comprises:
Step 310, via node initiatively sends link information to the base station;
Via node provides service for the subscriber equipment of its coverage, because the minimizing of user apparatus service amount, via node sends the request of reshuffling by space interface signaling to Donor-eNB, includes link information in this request.
Link information can comprise the reason that traffic carrying capacity reduces, information (the concrete distributing position of Fake MBSFN subframe that can indicate needs to reduce herein that also can comprise minimizing/modification FakeMBSFN subframe, maybe need the sub-frame number that reduces, or the information that reduces, or the combination of above multiple information).
Step 320 after described link information is received in described base station, is reshuffled the back haul link descending sub frame;
After Donor-eNB receives this request, send the configuration information of the Fake MBSFN subframe of reshuffling to this via node by space interface signaling, Donor-eNB can connect the configuration information of reshuffling the new Fake MBSFN subframe (can include only the subframe distribution information of minimizing) of signaling (not getting rid of the space interface signaling that uses other herein, as MAC layer control signaling or other RRC signaling) transmission by RRC signaling such as RRC and give via node.
Because the SFN of access link and back haul link is not synchronous, via node sends in the request of reshuffling to Donor-eNB can also comprise the link temporal information, can be absolute time information, also can be relative time information.Absolute time can be the SFN and/or the sub-frame information of back haul link; Relative time can be that request a period of time or the Donor-eNB afterwards that the via node transmission is reshuffled acknowledges receipt of reconfiguration request a period of time afterwards.
Step 330, via node is revised the configuration information of its jurisdiction district about Fake MBSFN subframe after obtaining new Fake MBSFN configuration information immediately, and dispatch via node in Fake MBSFN subframe the base station.
Via node is revised the configuration information of its jurisdiction district about MBSFN, comprises the modification of system information, and notifies the configuration information of the subscriber equipment of connected state about MBSFN by dedicated signaling.At back haul link, via node comprises the temporal information moment corresponding and uses new configuration in its reconfiguration request.
In the present embodiment, Donor-eNB receives the configuration information that sends new Fake MBSFN after the reconfiguration request, also may have such scene: the distribution of Fake MBSFN subframe is reshuffled in the via node request, and quantity remains unchanged, and just its position in time slot is reshuffled in request.The traffic carrying capacity (indirect mode) that Donor-eNB also can be by detecting back haul link and the load level of base station itself are initiatively revised the configuration of Fake MBSFN, when disposing new Fake MBSFN, comprise via node and use the temporal information of new configuration, because Donor-eNB can not grasp the relevant information of complete via node, therefore Donor-eNB sends request to via node and reports necessary relevant information, after via node is received request, send link information to Donor-eNB, link information comprises following one or more: the information that the traffic carrying capacity of access link and/or back haul link changes, access link Radio Resource information on load, the back haul link descending sub frame of recommending configuration information complete or that change, the link temporal information.Wherein the link temporal information can be the SFN of the side-play amount, via node of the SFN of access link and back haul link corresponding access link when sending the information of access link and/or back haul link, the modification cycle of the system message of the deviate of the SFN of modification cycle, access link and the back haul link of the system message of the SFN of corresponding access link and sub-frame information, access link and access link or the application time (absolute time information, perhaps relative time information) of recommending when via node sends link information.After Donor-eNB receives this part information, send the temporal information that new Fake MBSFN subframe configuration information and/or application are reshuffled to via node.
In the present embodiment, via node sends link information by space interface signaling to Donor-eNB, via node also can send link information for core net (the Mobility Management Entity MME that connects during the via node access network (Mobility Management Entity)) by the Non-Access Stratum signaling, send described link information by core net to Donor-eNB then, after Donor-eNB receives described link information, processing method repeats no more with top identical herein.
Embodiment four
After via node inserts Donor-eNB jurisdiction district (cell-of-origin), be in relay function behind the acquisition configuration parameter and enable connection status.Donor-eNB is respectively subframe 3 and subframe 8 for the Fake MBSFN subframe of this via node configuration comprises two subframes.Be these two subframes of each radio frames, Donor-eNB will dispatch this via node with R-PDCCH.Donor-eNB connects the Fake MBSFN subframe of reshuffling this via node of configuration by space interface signaling such as RRC.At this moment, access link and back haul link are that SFN is synchronous.
Via node is because the consideration of mobile or Donor-eNB load balancing switches to adjacent sub-district (Target cell), and at this moment, the SFN of access link and back haul link is not synchronous.
Via node and Donor-eNB carry out Signalling exchange and realize that the process of reshuffling Fake MBSFN subframe comprises:
Step 410, via node initiatively sends link information to the base station;
Via node is because it covers the variation of user apparatus service amount down, and via node sends the request of reshuffling by space interface signaling to Donor-eNB, includes link information in this request.
Link information can comprise the reason that traffic carrying capacity changes, and also can comprise the information that the FakeMBSFN subframe is reshuffled in request.In this reconfiguration request, can also comprise the link temporal information, can be the deviate or the SFN and the sub-frame information of corresponding access link when sending reconfiguration request of the SFN of access link and back haul link, the modification cycle that also can comprise in addition, the system message of access link.If the SFN border of access link and back haul link does not line up, can also comprise the deviate of subframe.Because there is the characteristic in cycle in scheduling, the deviate of the SFN of access link and back haul link can delivery, or the deviate after the delivery separately.When the relaying node when Donor-eNB reports the deviate of SFN of access link and back haul link, Donor-eNB can be provided with the time that new Fake MBSFN subframe comes into force in view of the above, perhaps Donor-eNB can determine to send the time of reshuffling in view of the above, so that via node can upgrade the MBSFN configuration in its system message immediately.
Step 420 after described link information is received in described base station, is reshuffled the back haul link descending sub frame;
After Donor-eNB receives this request, reshuffle back haul link descending sub frame (Fake MBSFN subframe), and send the configuration information of the Fake MBSFN subframe of reshuffling and the temporal information of using the Fake MBSFN subframe of reshuffling to this via node by space interface signaling.
Step 430, dispatch via node at the back haul link descending sub frame base station.
Via node is revised the configuration information of its jurisdiction district about MBSFN after obtaining new Fake MBSFN subframe configuration information immediately, comprises the modification of system information, or notifies the configuration information of the subscriber equipment of connected state about MBSFN by dedicated signaling.At back haul link, the configuration that via node is used new Fake MBSFN subframe in the time of Donor-eNB indication.
Certainly; the present invention also can have other various embodiments; under the situation that does not deviate from spirit of the present invention and essence thereof; those of ordinary skill in the art work as can make various corresponding changes and distortion according to the present invention, but these corresponding changes and distortion all should belong to the protection range of the appended claim of the present invention.
Claims (13)
1. the collocation method of a via node descending sub frame comprises:
Via node sends link information to the base station, after described link information is received in described base station, disposes or reshuffle the back haul link descending sub frame, and described via node is monitored the scheduling of base station at the back haul link descending sub frame.
2. the method for claim 1 is characterized in that,
Described link information comprises one or more of following information: link traffic information, link load information, the configuration information of the back haul link descending sub frame of recommending, the link temporal information, wherein: described link traffic information comprises: the information that the traffic carrying capacity of access link and/or back haul link changes; Described link load information is meant, access link Radio Resource information on load; The configuration information of the back haul link descending sub frame of described recommendation is meant that the configuration of the back haul link descending sub frame of via node suggestion comprises: the quantity of the distribution of back haul link descending sub frame and/or back haul link descending sub frame; When described link temporal information is used for base station to determine dispatches this via node in the described configuration or the back haul link descending sub frame of reshuffling.
3. method as claimed in claim 2 is characterized in that,
The distribution cycle that also comprises the back haul link descending sub frame in the configuration information of the back haul link descending sub frame of described recommendation.
4. method as claimed in claim 2 is characterized in that,
The distribution that is distributed as complete back haul link descending sub frame of described back haul link descending sub frame, or only comprise the distribution of that part of back haul link descending sub frame that changes.
5. method as claimed in claim 2 is characterized in that,
Described link temporal information is any a group in the following temporal information: the side-play amount of the System Frame Number of access link and back haul link (SFN); The SFN of corresponding access link when via node sends link information; The SFN and the sub-frame information of corresponding access link when via node sends link information; The modification cycle of the system message of access link; The modification cycle of the deviate of the SFN of access link and back haul link and the system message of access link; The application time that via node is recommended.
6. the method for claim 1 is characterized in that,
Described base station configuration or reshuffle the back haul link descending sub frame and be meant: described base station sends the configuration information of back haul link descending sub frame and/or uses the temporal information of this configuration information to via node by space interface signaling.
7. method as claimed in claim 6 is characterized in that,
The configuration information of described back haul link descending sub frame is meant the distribution of back haul link descending sub frame, comprises that complete back haul link descending sub frame distributes, or the distribution of that part of back haul link descending sub frame that changes.
8. the method for claim 1 is characterized in that,
After described via node is received the configuration information of the back haul link descending sub frame that the base station sends, use described back haul link descending sub frame configuration in the following time:
The predefined time; The time of the described configuration information of application that the base station sends; The application time that via node is recommended; Use immediately.
9. method as claimed in claim 8 is characterized in that,
The described predefined time is meant that the next one of the system message of access link revises the initial moment or the default time of agreement in cycle.
10. as claim 1 or 8 described methods, it is characterized in that,
The configuration that described via node is used described back haul link descending sub frame is meant: via node is at the Physical Downlink Control Channel of described back haul link descending sub frame trunk monitoring node special use.
11. method as claimed in claim 10 is characterized in that,
Described via node is in the configuration information of the subscriber equipment of connected state about the back haul link descending sub frame by the dedicated signaling notice.
12. the method for claim 1 is characterized in that,
Described via node sends link information to the base station and comprises by space interface signaling and send link information to the base station; Perhaps send to core net, send link information by core net to the base station again by the Non-Access Stratum signaling.
13. the configuration-system of a via node descending sub frame comprises via node and base station, wherein:
Described via node comprises the link information sending module, receiver module and monitoring module, wherein:
Described link information sending module is used for sending link information to the base station;
Described receiver module is used to receive the configuration information of the back haul link descending sub frame that the base station sends;
Described monitoring module is used for monitoring at the back haul link descending sub frame of described base station configuration the scheduling of base station;
Described base station comprises receiver module, configuration module and sending module, wherein:
Described receiver module is used to receive the link information that described via node sends;
Described configuration module is used for disposing or reshuffle the back haul link descending sub frame according to described link information after receiver module receives the link information of described via node transmission;
Described sending module, be used for will configuration or the configuration information of the back haul link descending sub frame of reshuffling send to via node.
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