Method and apparatus for transmitting control signaling for MIMO transmission

• US 8,351,530 B2
• Filed: 02/15/2008
• Issued: 01/08/2013
• Est. Priority Date: 02/16/2007
• Status: Active Grant

• Current Assignee: Interdigital Technology Corporation (InterDigital, Inc.)
• Original Assignee: Interdigital Technology Corporation (InterDigital, Inc.)
• Inventors: Pan, Kyle Jung-Lin, Zhang, Guodong
• Primary Examiner(s): Tran, Khanh C
• Application Number:
  US12/031,871
• Publication Number:
  US 20080212701A1
• Time in Patent Office: 1,789 Days
• Field of Search: 375/267, 375/299, 375/347, 375/349, 700/53, 455/101, 455132-141
• US Class Current: 375/267
• CPC Class Codes: H04B 7/0417 Feedback systems
• CPC Class Codes: H04B 7/0452 Multi-user MIMO systems
• CPC Class Codes: H04L 5/0023 Time-frequency-space
• CPC Class Codes: H04L 5/0064 Rate requirement of the data, e.g. scalable bandwidth, data priority
• CPC Class Codes: H04L 5/0091 Signaling for the administration of the divided path
• CPC Class Codes: H04W 72/23 in the downlink direction of a wireless link, i.e. towards a terminal

Abstract

A method and apparatus for processing multiple-input multiple-output (MIMO) transmission are disclosed. A wireless transmit/receive unit (WTRU) receives downlink control information including WTRU-specific MIMO and transport format information and MIMO information for all other WTRUs assigned to the same resource. The WTRU processes received MIMO data based on the downlink control information. The downlink control information may also include transport format information for all other WTRUs assigned to the same RB. The downlink control information may be transmitted via WTRU-specific control signaling. All WTRUs'"'"' MIMO and/or transport format information may be transmitted via resource-specific common control signaling. The downlink control signaling format may include at least one of a number of streams for the WTRU, a number of active WTRUs assigned to the same resource, a spatial channel identity for the WTRU, a MIMO mode, a precoding matrix index and a precoding vector index.

Claims

1. A method for processing multi-user multiple-input multiple-output (MU-MIMO) transmission associated with one wireless transmit/receive unit (WTRU) of a plurality of WTRUs that are assignable to a same resource, the method comprising:

receiving, by the one wireless transmit/receive unit, downlink control information, the downlink control information indicating WTRU-specific MIMO information specific to the one WTRU, transport format information specific to the one WTRU and common MIMO information for the plurality of WTRUs assignable to the same resource; and

receiving and processing, by the one WTRU, MIMO data based on the downlink control information.

2. The method of claim 1 further comprising performing, by the one WTRU, joint detection using MIMO information of other WTRUs.

3. The method of claim 1 further comprising transmitting the downlink control information via individual control signaling assigned for the one WTRU.

4. The method of claim 1 further comprising transmitting the common MIMO information via resource-specific common control signaling.

5. The method of claim 1 wherein the MIMO information is one of a precoding matrix index (PMI) or a precoding vector index (PVI).

6. The method of claim 1 wherein the downlink control information further includes transport format information for all other WTRUs assigned to the same resource.

7. The method of claim 6 further comprising performing, by the WTRU interference cancellation using transport format information of other WTRUs.

8. The method of claim 6 further comprising transmitting transport format information of all WTRUs via resource-specific common control signaling.

9. A wireless transmit/receive unit (WTRU) for processing multi-user multiple-input multiple-output (MU-MIMO) transmission associated with a plurality of WTRUs including the WTRU that are assignable to a same resource, the WTRU comprising:

a receiver for receiving downlink control information and MIMO data, the downlink control information indicating WTRU-specific MIMO information specific to the WTRU, transport format information specific to the WTRU and common MIMO information for the plurality of WTRUs assignable to the same resource; and

a MIMO decoder for processing, by the WTRU, the MIMO data based on the downlink control information.

10. The WTRU of claim 9 wherein the MIMO decoder is configured to perform joint detection using MIMO information of other WTRUs.

11. The WTRU of claim 9 wherein the receiver is configured to receive the downlink control information via WTRU-specific control signaling.

12. The WTRU of claim 9 wherein the receiver is configured to receive the common MIMO information via resource-specific common control signaling.

13. The WTRU of claim 9 wherein the MIMO information is one of a precoding matrix index (PMI) or a precoding vector index (PVI).

14. The WTRU of claim 9 wherein the downlink control information further includes transport format information for all other WTRUs assigned to the same resource.

15. The WTRU of claim 14 wherein the MIMO decoder is configured to perform interference cancellation using transport format information of other WTRUs.

16. The WTRU of claim 14 wherein the receiver is configured to receive transport format information of all WTRUs via resource-specific common control signaling.

17. A method for supporting multi-user multiple-input multiple-output (MU-MIMO) transmission, the method comprising:

assigning a resource to wireless transmit/receive units (WTRUs);

transmitting downlink control information, the downlink control information including WTRU-specific MIMO information and transport format information for each of the WTRUs and common MIMO information for all WTRUs assigned to the same resource; and

transmitting MIMO data.

18. The method of claim 17 wherein the downlink control information is transmitted via individual control signaling assigned to each of the WTRUs.

19. The method of claim 17 wherein the common MIMO information is transmitted via resource-specific common control signaling.

20. The method of claim 17 wherein the MIMO information is one of a precoding matrix index (PMI) or a precoding vector index (PVI).

21. The method of claim 17 wherein the downlink control information further includes transport format information for all other WTRUs assigned to the same resource.

22. The method of claim 21 wherein transport format information of all WTRUs is transmitted via resource-specific common control signaling.

23. A Node-B for supporting multi-user multiple-input multiple-output (MU-MIMO) transmission, the Node-B comprising:

a controller for generating downlink control information, the downlink control information including wireless transmit/receive unit (WTRU)-specific MIMO information and transport format information for each of WTRUs and common MIMO information for all WTRUs assigned to the same resource; and

a transmitter for transmitting the downlink control information and MIMO data.

24. The Node-B of claim 23 wherein the transmitter is configured to transmit the downlink control information via WTRU-specific control signaling.

25. The Node-B of claim 23 wherein the transmitter is configured to transmit common MIMO information via resource-specific common control signaling.

26. The Node-B of claim 23 wherein the MIMO information is one of a precoding matrix index (PMI) or a precoding vector index (PVI).

27. The Node-B of claim 23 wherein the downlink control information further includes transport format information for all other WTRUs assigned to the same resource.

28. The Node-B of claim 27 wherein the transmitter is configured to transmit all transport format information of the WTRUs via resource-specific common control signaling.

29. A method for processing multi-user multiple-input multiple-output (MU-MIMO) transmission associated with one wireless transmit/receive unit (WTRU) of a plurality of WTRUs that are assignable to a same resource, the method comprising:

receiving, via the one WTRU, downlink control information, the downlink control information including first MIMO information specific to the one WTRU and first transport format information specific to the one WTRU, and indicating second MIMO information for processing MIMO data specific to the one WTRU from the same resource, exclusive of MIMO data of any other WTRU assignable to the same resource; and

receiving and processing the MIMO data specific to the one WTRU based on the downlink control information.

30. The method of claim 29 wherein the downlink control information further includes a MIMO mode.

31. The method of claim 29 wherein the downlink control information provides a precoding vector index (PVI) and a spatial channel identity.

32. The method of claim 31 further comprising transmitting the PVI via resource-specific common control signaling.

33. The method of claim 29 further comprising:

generating, by the one WTRU, a channel estimate using a dedicated reference signal assigned for the one WTRU; and

decoding, by the one WTRU, the MIMO data using the generated channel estimate.

34. The WTRU of claim 33 further comprising identifying the dedicated reference signal by the spatial channel identity.

35. A wireless transmit/receive unit (WTRU) for processing multiple-input multiple-output (MIMO) transmission, the WTRU comprising:

a receiver configured to receive downlink control information, the downlink control information including first MIMO information specific to the WTRU and first transport format information specific to the WTRU, and indicating second MIMO information for processing MIMO data specific to the WTRU from the same resource, exclusive of MIMO data of any other WTRU assignable to the same resource; and

a MIMO decoder configured to process the MIMO data specific to the WTRU based on the downlink control information.

36. The WTRU of claim 35 wherein the downlink control information further includes a MIMO mode.

37. The WTRU of claim 35 wherein the downlink control information provides a precoding vector index (PVI) and a spatial channel identity.

38. The WTRU of claim 37 wherein the PVI is transmitted via resource-specific common control signaling.

39. The WTRU of claim 35 further comprising a channel estimator for generating a channel estimate using a dedicated reference signal assigned for the WTRU, and the MIMO decoder is configured to use the channel estimate in decoding the MIMO data.

40. The WTRU of claim 39 wherein the dedicated reference signal is identified by the spatial channel identity.