Method and apparatus for specifying channel state information for multiple carriers

• US 20070183303A1
• Filed: 05/26/2006
• Published: 08/09/2007
• Est. Priority Date: 05/26/2005
• Status: Abandoned Application

• Current Assignee: Nokia Corporation
• Original Assignee: Nokia Corporation
• Inventors: Ma, Lin, Pi, Zhouyue, Zhou, Fei, Rong, Zhigang
• Application Number:
  US11/442,639
• Publication Number:
  US 20070183303A1
• Time in Patent Office: Days
• US Class Current: 370/206
• CPC Class Codes: H04L 1/0002 by adapting the transmission rate
• 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 1/0041 Arrangements at the transmitter end
• CPC Class Codes: H04L 5/0007 the frequencies being orthogonal, e.g. OFDM(A), DMT
• CPC Class Codes: H04L 5/0023 Time-frequency-space
• CPC Class Codes: H04L 5/0044 allocation of payload
• CPC Class Codes: H04L 5/006 Quality of the received signal, e.g. BER, SNR, water filling
• CPC Class Codes: H04L 5/0064 Rate requirement of the data, e.g. scalable bandwidth, data priority
• CPC Class Codes: H04L 5/0085 when channel conditions change
• CPC Class Codes: H04L 5/0096 Indication of changes in allocation

Abstract

An approach is provided for specifying channel state information in a multi-carrier communication system. A determination of either spectral locations of a first carrier and a second carrier, or correlation between the first carrier and the second carrier is made. A report format among a plurality of report formats is selected based on either the determined correlation or spectral locations. Each of the report formats specifies channel state information for the first carrier and the second carrier. The channel state information includes data rate information.

Claims

1. A method comprising:

determining either spectral locations of a first carrier and a second carrier, or correlation between the first carrier and the second carrier; and

selecting a report format among a plurality of report formats based on either the determined correlation or spectral locations,

wherein each of the report formats specifies channel state information for the first carrier and the second carrier, the channel state information including data rate information.

2. A method according to claim 1, wherein the first carrier and the second carrier are associated with a forward link, and the selected report format corresponds to a reverse link.

3. A method according to claim 1, wherein the selection of the report format is further based on a configuration parameter of a multi-carrier data network configured to provide the first carrier and the second carrier.

4. A method according to claim 1, wherein the report format includes one of a full report format or a differential report format.

5. A method according to claim 1, wherein the first carrier and the second carrier are associated with one of a plurality of groups, the method further comprising:

designating the first carrier as a representative carrier for the one group, wherein the selected report format for the representative carrier is a full report format and a report format of the second carrier is a differential report format.

6. A method according to claim 5, further comprising:

separately encoding reports corresponding to the report formats of the first carrier and the second carrier; and

transmitting the separately encoded reports over respective separate channels.

7. A method according to claim 5, further comprising:

jointly encoding reports corresponding to the report formats of the first carrier and the second carrier; and

transmitting the jointly encoded reports over a single channel.

8. A method according to claim 5, further comprising:

negotiating a change of the selected report format during a communication session supported by the first carrier and the second carrier.

9. A method according to claim 8, wherein the negotiation is initiated by either an assignment of one of the carriers, a de-assignment of one of the carriers, a change in group arrangement of the carriers, or a change in correlation of the carriers of a common group.

10. A method according to claim 1, wherein the channel state information includes data rate information of the carriers or channel quality information.

11. An apparatus comprising:

a processor configured to determine either spectral locations of a first carrier and a second carrier, or correlation between the first carrier and the second carrier; and

selection logic configured to select a report format among a plurality of report formats based on either the determined correlation or spectral locations,

wherein each of the report formats specifies channel state information for the first carrier and the second carrier, the channel state information including data rate information.

12. An apparatus according to claim 11, wherein the first carrier and the second carrier are associated with a forward link, and the selected report format corresponds to a reverse link.

13. An apparatus according to claim 11, wherein the selection of the report format is further based on a configuration parameter of a multi-carrier data network configured to provide the first carrier and the second carrier.

14. An apparatus according to claim 11, wherein the report format includes one of a full report format or a differential report format.

15. An apparatus according to claim 11, wherein the first carrier and the second carrier are associated with one of a plurality of groups, the processor being further configured to designate the first carrier as a representative carrier for the one group, wherein the selected report format for the representative carrier is a full report format and a report format of the second carrier is a differential report format.

16. An apparatus according to claim 15, further comprising:

an encoder configured to separately encode reports corresponding to the report formats of the first carrier and the second carrier, wherein the separately encoded reports are transmitted over respective separate channels.

17. An apparatus according to claim 15, further comprising:

an encoder configured to jointly encode reports corresponding to the report formats of the first carrier and the second carrier, wherein the jointly encoded reports are transmitted over a single channel.

18. An apparatus according to claim 15, wherein the processor is further configured to negotiate a change of the selected report format during a communication session supported by the first carrier and the second carrier.

19. An apparatus according to claim 18, wherein the negotiation is initiated by either an assignment of one of the carriers, a de-assignment of one of the carriers, a change in group arrangement of the carriers, or a change in correlation of the carriers of a common group.

20. An apparatus according to claim 11, wherein the channel state information includes data rate information of the carriers or channel quality information.

21. A system comprising the apparatus of claim 11, the system further comprising:

means for receiving user input to initiate communication over the carriers; and

a display configured to display the user input.

22. A system comprising:

a base station configured to communicate over a first link comprising a plurality of carriers; and

a terminal configured to communicate with the base station over the first link and a second link, wherein the terminal is further configured to determine either spectral locations of the carriers or correlation between the carriers, the terminal being further configured to select one of a plurality of report channel formats corresponding to the second link based on either the spectral locations or the correlation,

wherein each of the report channel formats specifies channel state information including data rate information for the carriers.

23. A system according to claim 22, wherein the first link is a forward link and the second link is a reverse link, the selection of the report format being further based on a configuration parameter of a multi-carrier data network configured to provide the carriers, wherein the report format includes one of a full report format or a differential report format.

24. A system according to claim 22, wherein the carriers provide an overlay data network onto a single carrier network.