Varied signaling channels for a reverse link in a wireless communication system

• US 9,225,416 B2
• Filed: 10/27/2005
• Issued: 12/29/2015
• Est. Priority Date: 10/27/2005
• Status: Active Grant

• Current Assignee: Qualcomm, Inc.
• Original Assignee: Qualcomm, Inc.
• Inventors: Gorokhov, Alexei, Khandekar, Aamod, Teague, Edward Harrison, Sampath, Hemanth
• Primary Examiner(s): DOAN, PHUOC HUU
• Application Number:
  US11/261,806
• Publication Number:
  US 20070097942A1
• Time in Patent Office: 3,715 Days
• Field of Search: 370/208, 370/431, 370/336, 370/295, 370/319, 370/330, 370/329, 455/434, 455/450, 375/130
• US Class Current: 1/1
• CPC Class Codes: H04B 7/2656 for structure of frame, burst

Abstract

Signaling is efficiently sent on a configurable CDMA control segment. To send signaling, transmission parameters for the CDMA control segment for a serving sector are determined. These parameter may indicate the CDMA control segment size, the frames in which the CDMA control segment is sent, the signaling channels to be sent on the CDMA control segment, and so on. The enabled CDMA signaling channels for a terminal and the average transmission interval for each enabled CDMA signaling channel are determined. For each frame in which the CDMA control segment is sent, the signaling channels to be sent on the CDMA control segment in that frame are determined. The signaling for each signaling channel is processed (e.g., encoded, channelized, scaled, and scrambled). The processed signaling for all signaling channels is combined and mapped to a time-frequency region used for the CDMA control segment in the frame.

Claims

1. An apparatus comprising:

at least one processor configured to determine frames in which a control segment is sent and, for each frame in which the control segment is sent, to process signaling for signaling channels, if any, to be sent on the control segment in the frame, and to map the processed signaling to a time-frequency region used for the control segment in the frame, wherein signaling from multiple terminals are sent on the control segment with code division multiple access (CDMA) and wherein the time-frequency region comprises OFDM symbols; and

a memory coupled to the at least one processor.

2. The apparatus of claim 1, wherein the control segment is sent in every Q frames, where Q is an integer greater than one.

3. The apparatus of claim 1, wherein the control segment spans an entire frame for each frame in which the control segment is sent.

4. The apparatus of claim 1, wherein each frame covers multiple subbands, and wherein the control segment has a configurable size and is sent in an integer number of subbands.

5. The apparatus of claim 1, wherein for each of the signaling channels the at least one processor is configured to encode a message for the signaling channel to obtain a coded message, and to channelize the coded message with a channelization code for the signaling channel.

6. The apparatus of claim 5, wherein for each of the signaling channels the at least one processor is configured to encode the message for the signaling channel by mapping the message to one of a plurality of Walsh sequences.

7. The apparatus of claim 5, wherein for each of the signaling channels the at least one processor is configured to generate the channelization code for the signaling channel based on an index for the signaling channel and an identifier for a base station intended to receive the signaling channel.

8. The apparatus of claim 1, wherein messages for the signaling channels have equal length.

9. The apparatus of claim 1, wherein the at least one processor is configured to scramble the signaling for the signaling channels with at least one scrambling sequence.

10. The apparatus of claim 9, wherein the at least one processor is configured to generate one of the at least one scrambling sequence based on an identifier for a base station intended to receive the signaling channels.

11. The apparatus of claim 9, wherein the at least one processor is configured to generate one of the at least one scrambling sequence based on an identifier for a terminal sending the signaling channels and an identifier for a base station intended to receive the signaling channels.

12. The apparatus of claim 1, wherein the at least one processor is configured to combine the signaling for the signaling channels, to transform the combined signaling to frequency domain to obtain signaling symbols, and to map the signaling symbols on the time-frequency region used for the control segment in the frame.

13. The apparatus of claim 1, wherein the signaling channels includes a signaling channel carrying channel quality indicator (CQI).

14. The apparatus of claim 13, wherein the at least one processor is configured to send the signaling channel carrying CQI to multiple base stations.

15. The apparatus of claim 1, wherein the signaling channels includes a signaling channel carrying beamforming feedback information.

16. The apparatus of claim 1, wherein the signaling channels includes a signaling channel carrying feedback information indicative of channel quality for at least one subband among multiple subbands.

17. The apparatus of claim 1, wherein the signaling channels includes a signaling channel carrying feedback information for multiple spatial channels of a multiple-input multiple-output (MIMO) channel.

18. The apparatus of claim 1, wherein the at least one processor is configured to determine the signaling channels to be sent on the control segment in the frame based on an average transmission interval for each signaling channel.

19. The apparatus of claim 1, wherein the control segment hops across frequency from frame to frame.

20. The apparatus of claim 1, wherein the at least one processor is configured to determine subcarriers used for a traffic channel, to determine subcarriers allocated for the control segment, and to map the traffic channel to the subcarriers allocated for the control segment if the traffic channel collides with the control segment.

21. The apparatus of claim 1, wherein the time-frequency region comprises at least 8 OFDM symbols and at least 128 sub-carriers.

22. In a wireless communications system, a method comprising:

determining frames in which a control segment is sent; and

for each frame in which the control segment is sent,

processing signaling for signaling channels to be sent on the control segment in the frame, wherein the processing the signaling for the signaling channels comprises mapping a message for each of the signaling channels to a Walsh sequence among a plurality of Walsh sequences, and channelizing the Walsh sequence for each signaling channel with a channelization code for the signaling channel, and

mapping the processed signaling to a time-frequency region used for the control segment in the frame, wherein the time-frequency region comprises OFDM symbols.

23. The method of claim 22, wherein the processing the signaling for the signaling channels comprises generating the channelization code for each signaling channel based on an index for the signaling channel and an identifier for a base station intended to receive the signaling channel.

24. The method of claim 22, wherein the processing the signaling for the signaling channels comprises scrambling the signaling for the signaling channels with at least one scrambling sequence.

25. The method of claim 24, wherein the processing the signaling for the signaling channels comprises generating one of the at least one scrambling sequence based on an identifier for a terminal sending the signaling channels and an identifier for a base station intended to receive the signaling channels.

26. The method of claim 22, wherein the processing the signaling for the signaling channels comprises

combining the signaling for the signaling channels,

transforming the combined signaling to frequency domain to obtain signaling symbols, and

mapping the signaling symbols to the time-frequency region used for the control segment in the frame.

27. The method of claim 22, wherein the time-frequency region comprises at least 8 OFDM symbols and at least 128 sub-carriers.

28. An apparatus comprising:

means for determining frames in which a control segment is sent; and

means for processing each frame in which the control segment is sent, comprising

means for processing signaling for signaling channels to be sent on the control segment in the frame, wherein the means for processing the signaling for the signaling channels comprises

means for mapping a message for each of the signaling channels to a Walsh sequence among a plurality of Walsh sequences, and

means for channelizing the Walsh sequence for each signaling channel with a channelization code for the signaling channel, and

means for mapping the processed signaling to a time-frequency region used for the control segment in the frame, wherein the time-frequency region comprises OFDM symbols.

29. The apparatus of claim 28, wherein the means for processing the signaling for the signaling channels comprises

means for generating the channelization code for each signaling channel based on an index for the signaling channel and an identifier for a base station intended to receive the signaling channel.

30. The apparatus of claim 28, wherein the means for processing the signaling for the signaling channels comprises means for scrambling the signaling for the signaling channels with at least one scrambling sequence.

31. The apparatus of claim 30, wherein the means for processing the signaling for the signaling channels comprises means for generating one of the at least one scrambling sequence based on an identifier for a terminal sending the signaling channels and an identifier for a base station intended to receive the signaling channels.

32. The apparatus of claim 28, wherein the time-frequency region comprises at least 8 OFDM symbols and at least 128 sub-carriers.

33. An apparatus comprising:

at least one processor configured to channelize messages for multiple signaling channels with multiple channelization codes, to generate the multiple channelization codes for the multiple signaling channels based on a pseudo-random number (PN) generator and different seed values for the multiple signaling channels, to scramble the channelized messages with at least one scrambling code, and to map the scrambled messages to a time-frequency region used for a control segment, wherein the time-frequency region comprises OFDM symbols; and

a memory coupled to the at least one processor.

34. The apparatus of claim 33, wherein the at least one processor is configured to generate one of the at least one scrambling sequence based on an identifier for a terminal sending the multiple signaling channels and an identifier for a base station intended to receive the multiple signaling channels.

35. The apparatus of claim 33, wherein the at least one processor is configured to map the messages for the multiple signaling channels to Walsh sequences, and to channelize the Walsh sequences with the multiple channelization codes.

36. The apparatus of claim 33, wherein the multiple signaling channels carry different types of feedback information, and wherein the messages for the multiple signaling channels carry channel quality indicator (CQI), beamforming feedback information, subband feedback information, or a combination thereof.

37. The apparatus of claim 33, wherein the time-frequency region comprises at least 8 OFDM symbols and at least 128 sub-carriers.

38. An apparatus comprising:

at least one processor configured

to determine frames in which a control segment is sent and, for each frame in which the control segment is sent,

to extract received symbols from a time-frequency region used for the control segment in the frame wherein the time-frequency region comprises OFDM symbols,

to determine signaling channels potentially sent by a terminal on the control segment in the frame, wherein signaling from multiple terminals are sent on the control segment with code division multiple access (CDMA), and

to process the received symbols for the potentially sent signaling channels to recover signaling sent by the terminal; and

a memory coupled to the at least one processor.

39. The apparatus of claim 38, wherein the control segment is sent in every Q frames, where Q is an integer greater than one.

40. The apparatus of claim 38, wherein the control segment spans an entire frame for each frame in which the control segment is sent.

41. The apparatus of claim 38, wherein the at least one processor is configured to transform the received symbols to time domain to obtain received samples, and to descramble the received samples with at least one scrambling sequence.

42. The apparatus of claim 41, wherein the at least one processor is configured to generate one of the at least one scrambling sequence based on an identifier for the terminal and an identifier for a base station receiving the control segment.

43. The apparatus of claim 38, wherein for each of the potentially sent signaling channels the at least one processor is configured to perform channelization with a channelization code for the signaling channel to obtain channelized samples, and to decode the channelized samples to recover a message for the signaling channel.

44. The apparatus of claim 43, wherein for each potentially sent signaling channel the at least one processor is configured to map the channelized samples to a Walsh sequence among a plurality of Walsh sequences, and to provide a message associated with the Walsh sequence as a recovered message for the signaling channel.

45. The apparatus of claim 43, wherein for each potentially sent signaling channel the at least one processor is configured to generate the channelization code for the signaling channel based on an index for the signaling channel and an identifier for a base station intended to receive the signaling channel.

46. The apparatus of claim 38, wherein the time-frequency region comprises at least 8 OFDM symbols and at least 128 sub-carriers.

47. A method comprising:

determining frames in which a control segment is sent; and

for each frame in which the control segment is sent,

extracting received symbols from a time-frequency region used for the control segment in the frame, wherein the time-frequency region comprises OFDM symbols,

determining signaling channels potentially sent by a terminal on the control segment in the frame, and

processing the received symbols for the potentially sent signaling channels to recover signaling sent by the terminal, wherein the processing the received symbols for the potentially sent signaling channels comprises transforming the received symbols to time domain to obtain received samples, and descrambling the received samples with at least one scrambling sequence.

48. The method of claim 47, wherein the processing the received symbols for the potentially sent signaling channels comprises, for each potentially sent signaling channel,

performing channelization with a channelization code for the signaling channel to obtain channelized samples,

mapping the channelized samples to a Walsh sequence among a plurality of Walsh sequences, and

providing a message associated with the Walsh sequence as a recovered message for the signaling channel.

49. The method of claim 47, wherein the time-frequency region comprises at least 8 OFDM symbols and at least 128 sub-carriers.

50. An apparatus comprising:

means for determining frames in which a control segment is sent; and

means for processing each frame in which the control segment is sent, comprising

means for extracting received symbols from a time-frequency region used for the control segment in the frame, wherein the time-frequency region comprises OFDM symbols,

means for determining signaling channels potentially sent by a terminal on the control segment in the frame, and

means for processing the received symbols for the potentially sent signaling channels to recover signaling sent by the terminal, wherein the means for processing the received symbols for the potentially sent signaling channels comprises

means for transforming the received symbols to time domain to obtain received samples, and

means for descrambling the received samples with at least one scrambling sequence.

51. The apparatus of claim 50, wherein the means for processing the received symbols for the potentially sent signaling channels comprises, for each potentially sent signaling channel,

means for performing channelization with a channelization code for the signaling channel,

means for mapping channelized samples to a Walsh sequence among a plurality of Walsh sequences, and

means for providing a message associated with the Walsh sequence as a recovered message for the signaling channel.

52. The apparatus of claim 50, wherein the time-frequency region comprises at least 8 OFDM symbols and at least 128 sub-carriers.

53. An apparatus comprising:

at least one processor configured

to determine transmission parameters for a control segment,

to determine signaling channels that are enabled for the control segment, and

to send control information indicative of the transmission parameters for the control segment and the enabled signaling channels for the control segment,

wherein signaling from multiple terminals are sent on the control segment with code division multiple access (CDMA) scheme,

wherein the transmission parameters for the control segment indicate size of the control segment and frames in which the control segment is sent, and

wherein the size of the control segment comprises at least 8 OFDM symbols and 128 sub-carriers; and

a memory coupled to the at least one processor.

54. The apparatus of claim 53, wherein the at least one processor is configured to determine an average transmission interval for each of the enabled signaling channels for the control segment.

55. The apparatus of claim 53, wherein the at least one processor is configured to determine signaling channels that are enabled for each of at least one terminal.

56. A non-transitory computer-readable storage medium comprising code executable by a computer, the non-transitory computer-readable storage medium comprising:

code for causing a computer to determine frames in which a control segment is sent; and

for each frame in which the control segment is sent,

code for causing a computer to process signaling for signaling channels to be sent on the control segment in the frame, wherein the processing the signaling for the signaling channels comprises code for causing a computer to map a message for each of the signaling channels to a Walsh sequence among a plurality of Walsh sequences, and channelize the Walsh sequence for each signaling channel with a channelization code for the signaling channel, and

code for causing a computer to map the processed signaling to a time-frequency region used for the control segment in the frame, wherein the time-frequency region comprises OFDM symbols.

57. A non-transitory computer-readable storage medium comprising code executable by a computer, the non-transitory computer-readable storage medium comprising:

code for causing a computer to determine frames in which a control segment is sent; and

for each frame in which the control segment is sent,

code for causing a computer to extract received symbols from a time-frequency region used for the control segment in the frame, wherein the time-frequency region comprises OFDM symbols,

code for causing a computer to determine signaling channels potentially sent by a terminal on the control segment in the frame, and

code for causing a computer to process the received symbols for the potentially sent signaling channels to recover signaling sent by the terminal, wherein the processing the received symbols for the potentially sent signaling channels comprises code for causing a computer to transform the received symbols to time domain to obtain received samples, and descramble the received samples with at least one scrambling sequence.