Channelizing packet acknowledgments for multiple data channels in wireless communication

• US 9,407,418 B2
• Filed: 02/07/2014
• Issued: 08/02/2016
• Est. Priority Date: 03/29/2005
• Status: Active Grant

• Current Assignee: Qualcomm, Inc.
• Original Assignee: Qualcomm, Inc.
• Inventors: Damnjanovic, Aleksandar, Odenwalder, Joseph Paul, Lundby, Stein Arne, Wei, Yongbin
• Primary Examiner(s): Siddiqui, Kashif
• Application Number:
  US14/175,109
• Publication Number:
  US 20140153379A1
• Time in Patent Office: 907 Days
• US Class Current: 1/1
• CPC Class Codes: H04B 1/707 using direct sequence modulation
• CPC Class Codes: H04J 11/00 Orthogonal multiplex systems, e.g. using WALSH codesH04J13/00 takes precedence
• CPC Class Codes: H04J 13/0048 Walsh
• CPC Class Codes: H04J 13/12 Generation of orthogonal codes
• CPC Class Codes: H04L 1/0026 Transmission of channel quality indication
• CPC Class Codes: H04L 1/0029 Reduction of the amount of signalling, e.g. retention of useful signalling or differential signalling power control H04W52/04
• CPC Class Codes: H04L 1/0057 Block codes H04L1/0061, H04L1/0064 take precedence
• CPC Class Codes: H04L 1/1607 Details of the supervisory signal
• CPC Class Codes: H04L 5/0007 the frequencies being orthogonal, e.g. OFDM(A), DMT
• CPC Class Codes: H04L 5/0016 Time-frequency-code
• CPC Class Codes: H04L 5/0044 allocation of payload
• CPC Class Codes: H04L 5/0048 Allocation of pilot signals, i.e. of signals known to the receiver
• CPC Class Codes: H04L 5/005 of common pilots, i.e. pilots destined for multiple users or terminals
• CPC Class Codes: H04L 5/0053 Allocation of signaling, i.e. of overhead other than pilot signals
• CPC Class Codes: H04L 5/0055 Physical resource allocation for ACK/NACK for physical mapping arrangements in ARQ protocols H04L1/1861
• CPC Class Codes: H04L 5/0057 Physical resource allocation for CQI
• CPC Class Codes: H04L 5/006 Quality of the received signal, e.g. BER, SNR, water filling
• CPC Class Codes: H04L 5/0094 Indication of how sub-channels of the path are allocated

Abstract

Acknowledgments for packets received on multiple data channels in wireless communication are channelized with multiple orthogonal codes to generate multiple symbol sequences. Modulation symbols for an acknowledgment channel are generated based on the symbol sequences.

Claims

1. An apparatus comprising:

at least one processor configured to obtain acknowledgements for packets received on multiple data channels, to channelize an acknowledgement for each data channel with an orthogonal code assigned to the data channel to generate a symbol sequence for the data channel, and to generate modulation symbols for an acknowledgement channel based on symbol sequences for the multiple data channels; and

a memory coupled to the at least one processor.

2. The apparatus of claim 1, wherein the at least one processor is configured to receive the packets on the multiple data channels via multiple forward link (FL) carriers.

3. The apparatus of claim 1, wherein the at least one processor is configured to replicate the symbol sequence for each data channel multiple times and to sum replicated symbol sequences for the multiple data channels to obtain the modulation symbols for the acknowledgement channel.

4. The apparatus of claim 1, wherein the at least one processor is configured to use an orthogonal code of all zeros if acknowledgements are being sent for only one data channel.

5. The apparatus of claim 1, wherein the number of data channels is configurable.

6. The apparatus of claim 5, wherein the at least one processor is configured to use orthogonal codes of a first length if the number of data channels is less than a first value, and to use orthogonal codes of a second length if the number of data channels is equal to or greater than the first value.

7. The apparatus of claim 1, wherein the orthogonal code for each data channel is a Walsh code.

8. The apparatus of claim 1, wherein the multiple data channels are forward packet data channels (F-PDCHs) sent on multiple forward link carriers in a Code Division Multiple Access (CDMA) system.

9. A method comprising:

obtaining acknowledgements for packets received on multiple data channels;

channelizing an acknowledgement for each data channel with an orthogonal code assigned to the data channel to generate a symbol sequence for the data channel; and

generating modulation symbols for an acknowledgement channel based on symbol sequences for the multiple data channels.

10. The method of claim 9, wherein the generating the modulation symbols comprises

replicating the symbol sequence for each data channel multiple times, and

summing replicated symbol sequences for the multiple data channels to obtain the modulation symbols for the acknowledgement channel.

11. The method of claim 9, further comprising:

using orthogonal codes of a first length if the number of data channels is less than a first value; and

using orthogonal codes of a second length if the number of data channels is equal to or greater than the first value.

12. An apparatus comprising:

means for obtaining acknowledgements for packets received on multiple data channels;

means for channelizing an acknowledgement for each data channel with an orthogonal code assigned to the data channel to generate a symbol sequence for the data channel; and

means for generating modulation symbols for an acknowledgement channel based on symbol sequences for the multiple data channels.

13. The apparatus of claim 12, wherein the means for generating the modulation symbols comprises

means for replicating the symbol sequence for each data channel multiple times, and

means for summing replicated symbol sequences for the multiple data channels to obtain the modulation symbols for the acknowledgement channel.

14. The apparatus of claim 12, further comprising:

means for using orthogonal codes of a first length if the number of data channels is less than a first value; and

means for using orthogonal codes of a second length if the number of data channels is equal to or greater than the first value.