WO2008046822A1 - Method for controlling retransmissions of multicast scalable data - Google Patents
Method for controlling retransmissions of multicast scalable data Download PDFInfo
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- WO2008046822A1 WO2008046822A1 PCT/EP2007/061017 EP2007061017W WO2008046822A1 WO 2008046822 A1 WO2008046822 A1 WO 2008046822A1 EP 2007061017 W EP2007061017 W EP 2007061017W WO 2008046822 A1 WO2008046822 A1 WO 2008046822A1
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- WIPO (PCT)
- Prior art keywords
- information
- uts
- multicast
- retransmissions
- group
- Prior art date
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Classifications
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L1/00—Arrangements for detecting or preventing errors in the information received
- H04L1/12—Arrangements for detecting or preventing errors in the information received by using return channel
- H04L1/16—Arrangements for detecting or preventing errors in the information received by using return channel in which the return channel carries supervisory signals, e.g. repetition request signals
- H04L1/18—Automatic repetition systems, e.g. Van Duuren systems
- H04L1/1867—Arrangements specially adapted for the transmitter end
- H04L1/1874—Buffer management
- H04L1/1877—Buffer management for semi-reliable protocols, e.g. for less sensitive applications like streaming video
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L1/00—Arrangements for detecting or preventing errors in the information received
- H04L1/12—Arrangements for detecting or preventing errors in the information received by using return channel
- H04L1/16—Arrangements for detecting or preventing errors in the information received by using return channel in which the return channel carries supervisory signals, e.g. repetition request signals
- H04L1/18—Automatic repetition systems, e.g. Van Duuren systems
- H04L1/1829—Arrangements specially adapted for the receiver end
- H04L1/1835—Buffer management
- H04L1/1838—Buffer management for semi-reliable protocols, e.g. for less sensitive applications such as streaming video
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L1/00—Arrangements for detecting or preventing errors in the information received
- H04L2001/0092—Error control systems characterised by the topology of the transmission link
- H04L2001/0093—Point-to-multipoint
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L1/00—Arrangements for detecting or preventing errors in the information received
- H04L2001/0098—Unequal error protection
Definitions
- the present invention relates to a method for controlling retransmissions of scalable data of multicast services in a radio communications system.
- Multicast and broadcast services are currently envisaged to play an important role in future operators' service offerings. Nevertheless, the application of frequency-adaptive transmission in the form of link adaptation or adaptive resource allocation is not suitable for such services.
- MBMS Multicast and broadcast services
- For broadcasting services by definition the individual receivers are unknown to the transmitting entity, while for multicast services, some of the multicast gain may be lost due to overhead caused by the feedback signalling from all involved users and a degradation of the spectral efficiency due to adap- tation to the worst user channel conditions.
- the transmit information is composed of "basic information”, which should be correctly received by all users addressed by the multicast services, and "additional” or “nice to have” information, which completes the basis information and enhances its quality.
- European patent application No. EP06013395.6 filed 28 June, 2006, by Siemens AG, which content is herewith included in its entirety, discloses a transmission method for multicast services with scalable data. It is suggested there to adopt different transmission parameters for the basic information and the additional information, in such a way to guarantee that all UTs receive the basic information, while it is accepted that additional information is received only by UTs experiencing more favorable propagation conditions. No strategy is proposed, however, for the implementation of retransmissions in case of failure of the first transmission.
- a first aspect of the invention it is proposed to apply retransmission strategies to each of the different levels of transmit information in scalable data service transmissions.
- different levels of information are prioritised and, hence, have different transmission quality requirements.
- NACK/ACK channels independent shared return channels, e.g. NACK/ACK channels, for each level of information for transmission of feedback information on for example the transmission quality.
- different return channels are assigned different levels of capacity, for example the capacity of a return channel for basic information should be larger than for return channels of additional levels of information.
- a return channel is assigned for a number of levels of information, only, for example to the basic information level or to a small number of levels of information.
- the access to each return channel is contention based.
- forward channels i.e. multicast channels, for retransmissions of different level information are assigned different amounts of capacity.
- a seventh aspect of the invention in case the network determines that no retransmission of basic information is required, also no retransmission of further level information is effected.
- the network when receiving a negative acknowledgement on a return channel, the network retransmits only information level data corresponding to the return channel.
- retransmissions of data assigned to different information levels are scheduled. For example, basic information is retransmitted first, followed by retransmission of additional data, if necessary.
- transmission of feedback information for different information levels in return channels is scheduled.
- only feedback in- formation relating to received basic information may be transmitted in the return channel.
- feedback information relating to additional information may be transmitted in the return channel by the receiving UTs.
- individual timer may be realised for each information level.
- the group of UTs addressed by multicast transmissions are divided into at least two groups.
- a first group 0 comprises of UTs for which the network cannot acquire any knowledge about the downlink propagation conditions these UTs experience
- a second group 1 comprises of UTs for which the network, for example the base station, may acquire such information either indirectly from uplink data transmissions, or directly from the UTs via a feedback channel.
- the access to a return channel for transmission of basic information is restricted to users of the first group 0, as it can be assumed that parameters for the transmission of basic information are chosen by taking worst propagation conditions of UTs of the second group 1 into account.
- the network upon receipt of a negative acknowledge on the return channel of the basic information, assigns specific resources on an "ad-hoc" basis for retransmissions to UTs of the first group 0, only.
- the channel capacity assigned to the groups may be chosen in that first group 0 UTs are assigned a larger capacity than secondn group 1 UTs, wherein, in addition, the individual number of UTs in each of the groups is taken into account when defining the logical channel capacity.
- the second group's 1 UTs hereafter denoted as gl
- Transmission parameters of the first level of additional information are chosen so that it is received at least by all UTs in group 1 (and possibly also by UTs of group 0) .
- the second level of additional information is meant to be received at least by UTs in group gll, the third at least by UTs in gl2 etc.
- NACK negative acknowlegement
- the access to the return channel of information level x is re- stricted to users in the user-group glx, only.
- the message is retransmitted to one UT only via a unicast or dedicated channel.
- retransmissions will be carried out via multicast to all requiring UTs.
- the return channel is ac- Switchd by the UTs in contention based mode and a partial collision prevents the identification of the user ID, such that individual user IDs of the UTs cannot be extracted, the retransmission addresses all users via multicast.
- a nineteenth aspect of the invention it is furthermore proposed to transmit a sequence number of a missing or wrongly received data packet in the NACK message via the return channel.
- an identical NACK message is chosen for all those terminals.
- selective-repeat ARQ is efficiently realised.
- all data packets are retransmitted in- stead, i.e. a so called Go-back-N approach is applied.
- a twentieth aspect of the invention it is furthermore proposed to combine the aspect of a NACK message comprising a user ID with the aspect of the message compris ⁇ ing the sequence number.
- the amount of information re- dundancy and return signaling overhead can be adapted to the different QoS (Quality of Service) requirements of the different levels and to their different level of importance in building up the scalable data service. This allows avoiding waste of resources and hence unnecessary degradation of the spectral efficiency.
- QoS Quality of Service
- the access to the return channels on a contention base enables a significant reduction of the bandwidth assigned to this. Furthermore, this is particularly suitable for scalable data service transmissions, for which a prioritisation of ad- dressed users/user-groups can be identified in correspondence to the different levels of information, based on their different receiving capabilities. In this way, e.g. as soon as a NACK is received on a return channel from one user, a failure of transmission can be assumed for all users/user-groups with less receiving capability.
- the BS can, e.g., decide to enhance/reduce the level of redundancy of the first transmission, thus enhancing the reliability and the spectral efficiency of the first transmis- sion.
- the proposed idea may be applied e.g. for scalable video coding services.
- a pictorial representation of multicast transmission of scalable data may be found in the older European application No. EP06013395.6.
- enhancement packet for group glN etc.
- the retransmission of enhancement packet can be controlled by the sequence of basis information. For instance, if more basic packets need to be retransmitted, to be synchronised in content, more enhancement packets can be retransmitted.
- SVC Scalable video coding
Abstract
According to the invention, a method is proposed for controlling retransmissions of multicast scalable data in a radio communications system, wherein retransmissions of different information level data are effected differently.
Description
Description
Method for controlling retransmissions of multicast scalable data
The present invention relates to a method for controlling retransmissions of scalable data of multicast services in a radio communications system.
Multicast and broadcast services (MBMS) are currently envisaged to play an important role in future operators' service offerings. Nevertheless, the application of frequency-adaptive transmission in the form of link adaptation or adaptive resource allocation is not suitable for such services. For broadcasting services, by definition the individual receivers are unknown to the transmitting entity, while for multicast services, some of the multicast gain may be lost due to overhead caused by the feedback signalling from all involved users and a degradation of the spectral efficiency due to adap- tation to the worst user channel conditions.
It thus an object of the present invention to provide a method for controlling retransmissions of data using return channel information. This object is solved by the features of the independent claims. Further aspects of the invention are disclosed in dependent claims.
According to the invention, it is proposed an efficient method for controlling retransmissions of scalable multicast service data, for which the transmit information is composed of "basic information", which should be correctly received by all users addressed by the multicast services, and "additional" or "nice to have" information, which completes the basis information and enhances its quality.
European patent application No. EP06013395.6, filed 28 June, 2006, by Siemens AG, which content is herewith included in
its entirety, discloses a transmission method for multicast services with scalable data. It is suggested there to adopt different transmission parameters for the basic information and the additional information, in such a way to guarantee that all UTs receive the basic information, while it is accepted that additional information is received only by UTs experiencing more favorable propagation conditions. No strategy is proposed, however, for the implementation of retransmissions in case of failure of the first transmission.
According to a first aspect of the invention, it is proposed to apply retransmission strategies to each of the different levels of transmit information in scalable data service transmissions. According to an aspect of the present inven- tion, different levels of information are prioritised and, hence, have different transmission quality requirements.
According to a second aspect of the invention, it is proposed to reserve independent shared return channels, e.g. NACK/ACK channels, for each level of information for transmission of feedback information on for example the transmission quality.
According to a third aspect of the invention, different return channels are assigned different levels of capacity, for example the capacity of a return channel for basic information should be larger than for return channels of additional levels of information.
According to a fourth aspect of the invention, in an attempt to reduce the overhead due to the number of return channels, a return channel is assigned for a number of levels of information, only, for example to the basic information level or to a small number of levels of information.
According to a fifth aspect of the invention, in a further attempt to reduce the bandwidth overhead for return channels, the access to each return channel is contention based.
According to a sixth aspect of the invention, forward channels, i.e. multicast channels, for retransmissions of different level information are assigned different amounts of capacity.
According to a seventh aspect of the invention, in case the network determines that no retransmission of basic information is required, also no retransmission of further level information is effected.
According to an eighth aspect of the invention, when receiving a negative acknowledgement on a return channel, the network retransmits only information level data corresponding to the return channel.
According to a ninth aspect of the invention, retransmissions of data assigned to different information levels are scheduled. For example, basic information is retransmitted first, followed by retransmission of additional data, if necessary.
According to a tenth aspect of the invention, transmission of feedback information for different information levels in return channels is scheduled. As an example, after receiving multicast data, for a certain time period, only feedback in- formation relating to received basic information may be transmitted in the return channel. After lapse of this time period, for example controlled by a timer in the UT, also feedback information relating to additional information may be transmitted in the return channel by the receiving UTs. In addition, individual timer may be realised for each information level.
According to an eleventh aspect of the invention, the group of UTs addressed by multicast transmissions are divided into at least two groups. For example, a first group 0 comprises of UTs for which the network cannot acquire any knowledge about the downlink propagation conditions these UTs experience, whereas a second group 1 comprises of UTs for which the
network, for example the base station, may acquire such information either indirectly from uplink data transmissions, or directly from the UTs via a feedback channel.
According to a twelfth aspect of the invention, The access to a return channel for transmission of basic information is restricted to users of the first group 0, as it can be assumed that parameters for the transmission of basic information are chosen by taking worst propagation conditions of UTs of the second group 1 into account.
According to a thirteenth aspect of the invention, upon receipt of a negative acknowledge on the return channel of the basic information, the network assigns specific resources on an "ad-hoc" basis for retransmissions to UTs of the first group 0, only.
According to a fourteenth aspect of the invention, the return channel for requesting retransmissions of basic information divided into two logical channels assigned to the at least two groups of UTs. The channel capacity assigned to the groups may be chosen in that first group 0 UTs are assigned a larger capacity than secondn group 1 UTs, wherein, in addition, the individual number of UTs in each of the groups is taken into account when defining the logical channel capacity.
According to a fifteenth aspect of the invention, the second group's 1 UTs, hereafter denoted as gl, N sub-groups may be identified, g\N a g\NΛ <-=... c: g\ a gl, which are sorted according to increasing quality of the experienced propagation condition. Transmission parameters of the first level of additional information are chosen so that it is received at least by all UTs in group 1 (and possibly also by UTs of group 0) . Similarly, the second level of additional information is meant to be received at least by UTs in group gll, the third at least by UTs in gl2 etc.
Based on the fifteenth aspect, according to a sixteenth aspect of the invention, if a negative acknowlegement (NACK) is received by the network on the return channel dedicated for the information level x, it is interpreted as a NACK from all UTs in sub-groups glx' , with x'<x, and retransmissions are restricted to all UTs in these groups.
According to a seventeenth aspect of the invention, the access to the return channel of information level x is re- stricted to users in the user-group glx, only.
According to an eighteenth aspect of the invention, it is proposed to transmit a user ID of the UT in the NACK message via the return channel. In case only one UT has not received the information corresponding to that return channel, the message is retransmitted to one UT only via a unicast or dedicated channel. In case of more than one UT requesting the same data, retransmissions will be carried out via multicast to all requiring UTs. In case that the return channel is ac- cessed by the UTs in contention based mode and a partial collision prevents the identification of the user ID, such that individual user IDs of the UTs cannot be extracted, the retransmission addresses all users via multicast.
According to a nineteenth aspect of the invention, it is furthermore proposed to transmit a sequence number of a missing or wrongly received data packet in the NACK message via the return channel. In case the same data packet missing at one or more UTs, an identical NACK message is chosen for all those terminals. Hence, only that data packet is retransmitted via multicast, i.e. a so called selective-repeat ARQ is efficiently realised. In case that different data packets are missing (for example because only collision on the contention channel happened) , all data packets are retransmitted in- stead, i.e. a so called Go-back-N approach is applied.
According to a twentieth aspect of the invention, it is furthermore proposed to combine the aspect of a NACK message
comprising a user ID with the aspect of the message compris¬ ing the sequence number.
All aforementioned aspects of the invention may be realised individually or in combination with all or a number of other aspects .
By applying different retransmission strategies to the different levels of information, the amount of information re- dundancy and return signaling overhead can be adapted to the different QoS (Quality of Service) requirements of the different levels and to their different level of importance in building up the scalable data service. This allows avoiding waste of resources and hence unnecessary degradation of the spectral efficiency.
The limitation of the return channel only to the basis information enables a significant reduction of the retransmission overhead, while guaranteeing reliability where required.
The access to the return channels on a contention base enables a significant reduction of the bandwidth assigned to this. Furthermore, this is particularly suitable for scalable data service transmissions, for which a prioritisation of ad- dressed users/user-groups can be identified in correspondence to the different levels of information, based on their different receiving capabilities. In this way, e.g. as soon as a NACK is received on a return channel from one user, a failure of transmission can be assumed for all users/user-groups with less receiving capability.
To limit the access of the return channel of the basis information only to user-group 0, as well as of the return channel of information level 1 to user-group gl and of any further information level x to the sub-group glx, enables to enhance the information on the return channel for a given amount of bandwidth, e.g. by letting users in the allowed user group provide not only a NACK/ACK message, but also an indication
on how bad/good the quality of reception is. Based on this, the BS can, e.g., decide to enhance/reduce the level of redundancy of the first transmission, thus enhancing the reliability and the spectral efficiency of the first transmis- sion.
To restrict retransmissions of basic information on dedicated resources only to users in group 0 (for which no information on the receiving capabilities is available at the BS) , as well as of level 1 of information to user group gl and of any further level x of information only to the sub-group glx, enables to continue in parallel the multicast transmission, thus avoiding service delay to all other users.
The proposed idea may be applied e.g. for scalable video coding services. A pictorial representation of multicast transmission of scalable data may be found in the older European application No. EP06013395.6.
The retransmission of enhancement packet (for group glN etc.) can be controlled by the sequence of basis information. For instance, if more basic packets need to be retransmitted, to be synchronised in content, more enhancement packets can be retransmitted. Especially in SVC (Scalable video coding) , on the other hand, if there are less basic packets to be retransmitted, only the main frames (temporal important packets) in the enhancement layer are retransmitted.
Claims
1. Method for controlling retransmissions of multicast scalable data in a radio communciations system, wherein re- transmissions of different information level data are effected differently.
2. Radio communications system, comprising at least one base station and a number of user terminals, each comprising means for effecting the method according to claim 1.
3. Base station of a radio communications system, comprising means for effecting the method according to claim 1.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| EP07821383A EP2076991A1 (en) | 2006-10-16 | 2007-10-16 | Method for controlling retransmissions of multicast scalable data |
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| EP06021658 | 2006-10-16 | ||
| EP06021658.7 | 2006-10-16 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| WO2008046822A1 true WO2008046822A1 (en) | 2008-04-24 |
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ID=38963207
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| PCT/EP2007/061017 WO2008046822A1 (en) | 2006-10-16 | 2007-10-16 | Method for controlling retransmissions of multicast scalable data |
Country Status (2)
| Country | Link |
|---|---|
| EP (1) | EP2076991A1 (en) |
| WO (1) | WO2008046822A1 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103238289A (en) * | 2010-12-03 | 2013-08-07 | 诺基亚公司 | Intra-cluster d2d retransmission with instantaneous link adaptation and adaptive number of re-transmitter |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP1301041A1 (en) * | 2001-10-05 | 2003-04-09 | Matsushita Electric Industrial Co., Ltd. | Video data transmission method and apparatus |
| WO2003088554A1 (en) * | 2002-04-16 | 2003-10-23 | Koninklijke Philips Electronics N.V. | Transmission system with congestion control at the receiver end for deciding possible retransmission requests |
| US6771659B1 (en) * | 2000-01-21 | 2004-08-03 | Nokia Mobile Phones Ltd. | Method and apparatus for a selective acknowledgement scheme in a modified unacknowledge mode for use over a communications link |
| US20050129058A1 (en) * | 2003-10-08 | 2005-06-16 | Lorenzo Casaccia | Method and apparatus for feedback reporting in a wireless communications system |
| EP1633064A2 (en) * | 1997-02-14 | 2006-03-08 | Robert Bosch Gmbh | Method for transmitting multimedia data. |
-
2007
- 2007-10-16 WO PCT/EP2007/061017 patent/WO2008046822A1/en active Application Filing
- 2007-10-16 EP EP07821383A patent/EP2076991A1/en not_active Withdrawn
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP1633064A2 (en) * | 1997-02-14 | 2006-03-08 | Robert Bosch Gmbh | Method for transmitting multimedia data. |
| US6771659B1 (en) * | 2000-01-21 | 2004-08-03 | Nokia Mobile Phones Ltd. | Method and apparatus for a selective acknowledgement scheme in a modified unacknowledge mode for use over a communications link |
| EP1301041A1 (en) * | 2001-10-05 | 2003-04-09 | Matsushita Electric Industrial Co., Ltd. | Video data transmission method and apparatus |
| WO2003088554A1 (en) * | 2002-04-16 | 2003-10-23 | Koninklijke Philips Electronics N.V. | Transmission system with congestion control at the receiver end for deciding possible retransmission requests |
| US20050129058A1 (en) * | 2003-10-08 | 2005-06-16 | Lorenzo Casaccia | Method and apparatus for feedback reporting in a wireless communications system |
Non-Patent Citations (2)
| Title |
|---|
| MAO S ET AL: "RELIABLE TRANSMISSION OF VIDEO OVER AD-HOC NETWORKS USING AUTOMATIC REPEAT REQUEST AND MULTI-PATH TRANSPORT", VTC FALL 2001. IEEE 54TH. VEHICULAR TECHNOLOGY CONFERENCE. PROCEEDINGS. ATLANTIC CITY, NEW JERSEY, OCT. 7 - 11, 2001, IEEE VEHICULAR TECHNOLGY CONFERENCE, NEW YORK, NY : IEEE, US, vol. VOL. 2 OF 4. CONF. 54, 7 October 2001 (2001-10-07), pages 615 - 619, XP001124218, ISBN: 0-7803-7005-8 * |
| ZHENG H ET AL: "QoS aware mobile video communications", MILITARY COMMUNICATIONS CONFERENCE PROCEEDINGS, 1999. MILCOM 1999. IEEE ATLANTIC CITY, NJ, USA 31 OCT.-3 NOV. 1999, PISCATAWAY, NJ, USA,IEEE, US, 31 October 1999 (1999-10-31), pages 1231 - 1235, XP010369821, ISBN: 0-7803-5538-5 * |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103238289A (en) * | 2010-12-03 | 2013-08-07 | 诺基亚公司 | Intra-cluster d2d retransmission with instantaneous link adaptation and adaptive number of re-transmitter |
| US20130250843A1 (en) * | 2010-12-03 | 2013-09-26 | Nokia Corporation | Intra-cluster d2d retransmission with instantaneous link adaptation and adaptive number of re-transmitter |
| US9717069B2 (en) * | 2010-12-03 | 2017-07-25 | Nokia Technologies Oy | Intra-cluster D2D retransmission with instantaneous link adaptation and adaptive number of re-transmitter |
Also Published As
| Publication number | Publication date |
|---|---|
| EP2076991A1 (en) | 2009-07-08 |
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