METHOD AND APPARATUS FOR SUPPORTING MULTIPLE MULTIPLEXING SCHEMES FOR WIRELESS COMMUNICATION

• US 20070195899A1
• Filed: 02/20/2007
• Published: 08/23/2007
• Est. Priority Date: 02/21/2006
• Status: Active Grant

• Current Assignee: Qualcomm, Inc.
• Original Assignee: Qualcomm, Inc.
• Inventors: Gorokhov, Alexei, Bhushan, Naga
• Granted Patent: US 8,472,424 B2
• Time in Patent Office: Days
• US Class Current: 375/260
• CPC Class Codes: H04B 7/0452 Multi-user MIMO systems
• CPC Class Codes: H04B 7/0626 Channel coefficients, e.g. channel state information [CSI]
• CPC Class Codes: H04B 7/063 Parameters other than those covered in groups H04B7/0623 - H04B7/0634, e.g. channel matrix rank or transmit mode selection
• CPC Class Codes: H04B 7/0639 Using selective indices, e.g. of a codebook, e.g. pre-distortion matrix index [PMI] or for beam selection
• CPC Class Codes: H04J 13/0044 OVSF [orthogonal variable spreading factor]
• CPC Class Codes: H04L 1/0002 by adapting the transmission rate
• CPC Class Codes: H04L 1/0025 Transmission of mode-switching indication
• CPC Class Codes: H04L 1/0028 Formatting
• CPC Class Codes: H04L 1/06 using space diversity
• CPC Class Codes: H04L 1/1671 the supervisory signal being transmitted together with control information
• CPC Class Codes: H04L 1/1812 Hybrid protocols; Hybrid automatic repeat request [HARQ]
• CPC Class Codes: H04L 25/0204 of multiple channels
• CPC Class Codes: H04L 25/0226 sounding signals per se
• CPC Class Codes: H04L 27/2613 Structure of the reference signals
• CPC Class Codes: H04L 27/26132 using repetition
• CPC Class Codes: H04L 5/0026 Division using four or more dimensions
• CPC Class Codes: H04L 5/0048 Allocation of pilot signals, i.e. of signals known to the receiver
• CPC Class Codes: H04L 5/023 Multiplexing of multicarrier modulation signals multicarrier modulation H04L27/2601
• CPC Class Codes: H04L 5/1438 Negotiation of transmission parameters prior to communication modified according to link quality H04L1/0001
• CPC Class Codes: H04W 28/06 Optimizing the usage of the radio link, e.g. header compression, information sizing , discarding information system modifying transmission characteristic according to link quality by modifying frame length H04L1/0007; dynamic adaptation of the packet size for flow control or congestion control H04L47/365
• CPC Class Codes: H04W 28/18 : Negotiating wireless communication parameters
• CPC Class Codes: H04W 48/08 : Access restriction or access information delivery, e.g. discovery data delivery signalling during connection H04W76/00
• CPC Class Codes: Y02D 30/70 : in wireless communication networks

Abstract

Techniques for efficiently sending data in a wireless communication system are described. Time frequency resources available for orthogonal frequency division multiplexing (OFDM), which exclude time frequency resources used for traffic data and signaling sent with code division multiplexing (CDM), may be determined. The time frequency resources available for OFDM may be partitioned into multiple tiles. Each tile may be defined based on multiple OFDM symbol numerologies and may have a non-rectangular shape. Each terminal may be assigned at least one tile. A pilot pattern may be selected for each terminal from among multiple pilot patterns, which may support different delay spreads, spatial ranks, etc. Data and pilot may be exchanged with each terminal via the time frequency resources in the at least one tile assigned to the terminal. OFDM symbols may be processed based on multiple OFDM symbol numerologies for each assigned tile.

Claims

1. An apparatus comprising:

at least one processor to determine time frequency resources available for orthogonal frequency division multiplexing (OFDM) and excluding time frequency resources used for traffic data and signaling sent with code division multiplexing (CDM), and to assign the time frequency resources available for OFDM to at least one terminal; and

a memory coupled to the at least one processor.

2. The apparatus of claim 1, wherein the at least one processor partitions the time frequency resources available for OFDM into multiple tiles and assigns at least one of the multiple tiles to each of the at least one terminal.

3. The apparatus of claim 2, wherein each tile corresponds to a block of time frequency resources having a non-rectangular shape.

4. The apparatus of claim 2, wherein the at least one processor partitions the time frequency resources available for OFDM into multiple tiles of at least two different non-rectangular shapes.

5. The apparatus of claim 4, wherein two of the different non-rectangular shapes have mirror symmetry.

6. The apparatus of claim 5, wherein the two different non-rectangular shapes with mirror symmetry are associated with pilot patterns with mirror symmetry.

7. The apparatus of claim 2, wherein the at least one processor processes OFDM symbols based on multiple OFDM symbol numerologies for each tile assigned to the at least one terminal.

8. The apparatus of claim 2, wherein each tile includes a first section of time frequency resources defined based on a first OFDM symbol numerology and a second section of time frequency resources defined based on a second OFDM symbol numerology.

9. The apparatus of claim 8, wherein each tile further includes a third section of time frequency resources defined based on the first OFDM symbol numerology, the second section being located between the first and third sections.

10. The apparatus of claim 1, wherein the at least one processor assigns each terminal different ones of the multiple tiles over time to achieve frequency hopping.

11. The apparatus of claim 1, wherein the at least one processor selects a pilot pattern for each terminal from among multiple pilot patterns.

12. The apparatus of claim 11, wherein the multiple pilot patterns support at least two different delay spreads, and wherein the at least one processor selects the pilot pattern for each terminal based on an expected delay spread for the terminal.

13. The apparatus of claim 11, wherein the multiple pilot patterns support at least two different spatial ranks, and wherein the at least one processor selects the pilot pattern for each terminal based on a spatial rank for the terminal.

14. The apparatus of claim 11, wherein each of the multiple pilot patterns includes multiple clusters of pilot tones placed across a tile corresponding to a block of time frequency resources, each pilot tone corresponding to one subcarrier in one symbol period used for pilot.

15. The apparatus of claim 14, wherein the multiple clusters of pilot tones for each pilot pattern are placed in at least two frequency locations across the tile.

16. The apparatus of claim 14, wherein the multiple clusters of pilot tones for each pilot pattern are placed in at least two time locations across the tile.

17. The apparatus of claim 1, wherein the at least one processor sends a common pilot across the time frequency resources available for OFDM.

18. The apparatus of claim 2, wherein the at least one processor sends data to each terminal on the at least one tile assigned to the terminal and sends pilot to each terminal on the at least one tile and based on a pilot pattern selected for the terminal.

19. The apparatus of claim 2, wherein the at least one processor receives data from each terminal on the at least one tile assigned to the terminal and receives pilot from each terminal on the at least one tile and based on a pilot pattern selected for the terminal.

20. A method comprising:

determining time frequency resources available for orthogonal frequency division multiplexing (OFDM) and excluding time frequency resources used for traffic data and signaling sent with code division multiplexing (CDM); and

assigning the time frequency resources available for OFDM to at least one terminal.

21. The method of claim 20, wherein the assigning the time frequency resources available for OFDM comprises

partitioning the time frequency resources available for OFDM into multiple tiles, each tile corresponding to a block of time frequency resources, and

assigning at least one of the multiple tiles to each of the at least one terminal.

22. The method of claim 21, further comprising:

processing OFDM symbols based on multiple OFDM symbol numerologies for each tile assigned to the at least one terminal.

23. The method of claim 20, further comprising:

selecting a pilot pattern for each terminal from among multiple pilot patterns.

24. An apparatus comprising:

means for determining time frequency resources available for orthogonal frequency division multiplexing (OFDM) and excluding time frequency resources used for traffic data and signaling sent with code division multiplexing (CDM); and

means for assigning the time frequency resources available for OFDM to at least one terminal.

25. The apparatus of claim 24, wherein the means for assigning the time frequency resources available for OFDM comprises

means for partitioning the time frequency resources available for OFDM into multiple tiles, each tile corresponding to a block of time frequency resources, and

means for assigning at least one of the multiple tiles to each of the at least one terminal.

26. The apparatus of claim 25, further comprising:

means for processing OFDM symbols based on multiple OFDM symbol numerologies for each tile assigned to the at least one terminal.

27. The apparatus of claim 24, further comprising:

means for selecting a pilot pattern for each terminal from among multiple pilot patterns.

28. A processor readable media for storing instructions to:

determine time frequency resources available for orthogonal frequency division multiplexing (OFDM) and excluding time frequency resources used for traffic data and signaling sent with code division multiplexing (CDM); and

assign the time frequency resources available for OFDM to at least one terminal.

29. The processor readable media of claim 28, and further for storing instructions to:

select a pilot pattern for each terminal from among multiple pilot patterns.

30. An apparatus comprising:

at least one processor to receive an assignment of time frequency resources selected from time frequency resources available for orthogonal frequency division multiplexing (OFDM) and excluding time frequency resources used for traffic data and signaling sent with code division multiplexing (CDM), and to exchange data via the time frequency resources in the assignment; and

a memory coupled to the at least one processor.

31. The apparatus of claim 30, wherein the assignment is for a block of time frequency resources having a non-rectangular shape.

32. The apparatus of claim 30, the at least one processor processes OFDM symbols based on multiple OFDM symbol numerologies to exchange data via the time frequency resources in the assignment.

33. The apparatus of claim 30, wherein the at least one processor processes pilot symbols based on a pilot pattern selected from among multiple pilot patterns.

34. The apparatus of claim 33, wherein the pilot pattern includes multiple clusters of pilot tones placed across a tile corresponding to the time frequency resources in the assignment, and wherein the at least one processor sends at least one pilot symbol from at least one antenna on at least one pilot tone in each of the multiple clusters, one pilot symbol from each antenna in each cluster.

35. The apparatus of claim 33, wherein the pilot pattern includes multiple clusters of pilot tones placed across a tile corresponding to the time frequency resources in the assignment, and wherein the at least one processor sends at least one pilot symbol for at least one data stream in each of the multiple clusters, each pilot symbol being spread across all pilot tones in a cluster with an orthogonal code.

36. A method comprising:

receiving an assignment of time frequency resources selected from time frequency resources available for orthogonal frequency division multiplexing (OFDM) and excluding time frequency resources used for traffic data and signaling sent with code division multiplexing (CDM); and

exchanging data via the time frequency resources in the assignment.

37. The method of claim 36, wherein the exchanging data comprises processing OFDM symbols based on multiple OFDM symbol numerologies to exchange data via the time frequency resources in the assignment.

38. The method of claim 36, further comprising:

processing pilot symbols based on a pilot pattern selected from among multiple pilot patterns.

39. An apparatus comprising:

means for receiving an assignment of time frequency resources selected among time frequency resources available for orthogonal frequency division multiplexing (OFDM) and excluding time frequency resources used for traffic data and signaling sent with code division multiplexing (CDM); and

means for exchanging data via the time frequency resources in the assignment.

40. The apparatus of claim 39, wherein the means for exchanging data comprises

means for processing OFDM symbols based on multiple OFDM symbol numerologies to exchange data via the time frequency resources in the assignment.

41. The apparatus of claim 39, further comprising:

means for processing pilot symbols based on a pilot pattern selected from among multiple pilot patterns.