Method and apparatus for feedback reporting in a wireless communications system

• US 20050129058A1
• Filed: 10/06/2004
• Published: 06/16/2005
• Est. Priority Date: 10/08/2003
• Status: Active Grant

• Current Assignee: Qualcomm, Inc.
• Original Assignee: Qualcomm, Inc.
• Inventors: Casaccia, Lorenzo, Grilli, Francesco
• Granted Patent: US 8,687,607 B2
• Time in Patent Office: Days
• US Class Current: 370/464
• CPC Class Codes: H04L 1/0001 Systems modifying transmission characteristics according to link quality, e.g. power backoff adaptive data allocation for multicarrier modulation H04L5/0044; controlling transmission power for radio systems H04W52/04
• CPC Class Codes: H04L 1/1671 the supervisory signal being transmitted together with control information
• CPC Class Codes: H04L 1/1877 for semi-reliable protocols, e.g. for less sensitive applications like streaming video buffer level management for video bitstream control arrangements H04N21/44004
• CPC Class Codes: H04L 2001/0093 Point-to-multipoint
• CPC Class Codes: H04L 2001/0098 Unequal error protection
• CPC Class Codes: H04W 4/06 Selective distribution of broadcast services, e.g. multimedia broadcast multicast service [MBMS]; Services to user groups; One-way selective calling services
• CPC Class Codes: H04W 84/12 WLAN [Wireless Local Area Networks]

Abstract

Feedback from user stations to the base station for a multicast/broadcast transmission is performed by decoding multicast/broadcast data received from a transmitter on a downlink resource, forming a feedback message corresponding to the reception of the multicast/broadcast data, and queuing the feedback message for transmission to the transmitter on an uplink resource. The uplink resource used corresponds to the downlink resource used for the multicast/broadcast transmission. For unicast transmissions the uplink resource is dedicated to an uplink transmission corresponding to a downlink transmission on the downlink resource.

Claims

1. A method for sending feedback for a multicast/broadcast transmission comprising:

decoding multicast/broadcast data received from a transmitter on a downlink resource;

forming a feedback message corresponding to the reception of the multicast/broadcast data;

queuing the feedback message for transmission to the transmitter on an uplink resource that corresponds to the downlink resource, wherein for unicast transmissions the uplink resource is dedicated to an uplink transmission corresponding to a downlink transmission on the downlink resource.

2. The method of claim 1, wherein the uplink resource and the downlink resource are time slots in a time division multiple access communications system.

3. The method of claim 2, wherein the communications system is frequency division duplex.

4. The method of claim 2, wherein the communications system is time division duplex.

5. The method of claim 1, wherein the feedback message comprises at least in part an acknowledgement message.

6. The method of claim 1, wherein the feedback message comprises at least in part a negative acknowledgement message.

7. The method of claim 1, wherein the feedback message at least in part provides Quality-of-Service information.

8. The method of claim 1, wherein the feedback message at least in part provides an indication of audio transmission quality.

9. The method of claim 1, wherein the feedback message at least in part provides an indication of bit error rate.

10. The method of claim 1, wherein the feedback message at least in part provides an indication of frame error rate.

11. The method of claim 1, wherein the feedback message at least in part provides power control information.

12. The method of claim 1, wherein the feedback message at least in part provides an indication of video transmission quality.

13. The method of claim 12, wherein the feedback message provides information on the quality of reception of both intra-frame coded frames and inter-frame coded frames.

14. The method of claim 1, wherein the feedback message is formed in response to a prompt sent from the transmitter.

15. The method of claim 1, wherein the feedback message is part of a statistically sampled feedback scheme, wherein a subset of the total number of receivers in communication with the transmitter is sampled.

16. The method of claim 1, wherein the feedback message is used to decide to retransmit a protocol data unit by the transmitter.

17. The method of claim 16, wherein a decision to retransmit a protocol data unit is based at least in part on whether a number of receivers requiring retransmission exceeds a threshold.

18. The method of claim 1, wherein the feedback message sent as a random access message.

19. The method of claim 1, further comprising requesting an establishment of a short-lived uplink data connection using the uplink resource.

20. The method of claim 19, further comprising receiving an assignment message from the transmitter allowing the use of uplink resource.

21. The method of claim 6, wherein the negative acknowledgment message is cumulative for more than one protocol data unit.

22. The method of claim 21, further comprising discarding protocol data units from the negative acknowledgment message in response to the expiration of a timer.

23. The method of claim 16, wherein a decision to retransmit the protocol data unit is based in part on a numbers of receivers in a particular category sending a negative acknowledgement message.

24. The method of claim 16, wherein a decision to retransmit the protocol data unit is based in part on a number of negative acknowledgment messages for the protocol data unit.

25. The method of claim 16, wherein a decision to retransmit the protocol data unit is based in part on the relative importance of the protocol data unit among other protocol data units.

26. The method of claim 25, wherein the decision is further based in part on relative weights of receivers requiring retransmission, wherein a relative weight is assigned to every receiver in communication with the transmitter.

27. The method of claim 15, wherein the sampled receivers belong to more than one category and the statistically sampled feedback scheme is based in part on the more than one category.

28. The method of claim 1, wherein the feedback message at least in part includes the number of protocol data units received with error.

29. The method of claim 1, wherein the feedback message at least in part includes the number of protocol data units received without error.

30. The method of claim 1, wherein the feedback message at least in part includes the number of protocol data units that could not be decoded due to processing limitations.

31. An apparatus comprising:

a decoder to decode multicast/broadcast data received from a transmitter on a downlink resource;

a first processing unit to form a feedback message corresponding to the reception of the multicast/broadcast data;

a second processing unit to queue the feedback message for transmission to the transmitter on an uplink resource that corresponds to the downlink resource, wherein for unicast transmissions the uplink resource is dedicated to an uplink transmission corresponding to a downlink transmission on the downlink resource.

32. The apparatus of claim 31, wherein the uplink resource and the downlink resource are time slots in a time division multiple access communications system.

33. The apparatus of claim 31, wherein the feedback message is part of a statistically sampled feedback scheme, wherein a subset of the total number of receivers in communication with the transmitter is sampled.

34. The apparatus of claim 31, wherein the feedback message is used to decide to retransmit a protocol data unit by the transmitter.

35. An apparatus comprising:

means for decoding multicast/broadcast data received from a transmitter on a downlink resource;

means for forming a feedback message corresponding to the reception of the multicast/broadcast data;

means for queuing the feedback message for transmission to the transmitter on an uplink resource that corresponds to the downlink resource, wherein for unicast transmissions the uplink resource is dedicated to an uplink transmission corresponding to a downlink transmission on the downlink resource.

36. The apparatus of claim 35, wherein the uplink resource and the downlink resource are time slots in a time division multiple access communications system.

37. The apparatus of claim 35, wherein the feedback message is part of a statistically sampled feedback scheme, wherein a subset of the total number of receivers in communication with the transmitter is sampled.

38. The apparatus of claim 35, wherein the feedback message is used to decide to retransmit a protocol data unit by the transmitter.

39. An apparatus comprising:

a memory unit; and

a processor unit configured to execute instructions from the memory unit in order to;

decode multicast/broadcast data received from a transmitter on a downlink resource;

form a feedback message corresponding to the reception of the multicast/broadcast data; and

queue the feedback message for transmission to the transmitter on an uplink resource that corresponds to the downlink resource, wherein for unicast transmissions the uplink resource is dedicated to an uplink transmission corresponding to a downlink transmission on the downlink resource.