Method and apparatus for providing an efficient control channel structure in a wireless communication system

Patent metadata

Field	Value
Publication number	US-9473269-B2
Application number	US-72590403-A
Country	US
Kind code	B2
Filing date	Dec 1, 2003
Priority date	Dec 1, 2003
Publication date	Oct 18, 2016
Grant date	Oct 18, 2016

Abstract

According to one aspect of the invention, a method is provided in which a control channel used for transmitting control information is partitioned into a plurality of subchannels each of which is operated at a specific data rate. For each of one or more user terminals, one of the subchannels is selected based on one or more selection criteria for transmitting control information from an access point to the respective user terminal. Control information is transmitted from the access point to a user terminal on a particular subchannel selected for the respective user terminal. At the user terminal, one or more subchannels are decoded to obtain control information designated for the user terminal.

First claim

What is claimed is:

1. A method for processing information in a communication system, comprising:
partitioning, at an access point, a control channel used for transmitting control information into a plurality of subchannels;
selecting, for each of at least two user terminals, one of the subchannels to be used for transmitting the control information from the access point to the respective user terminal, based on one or more selection criteria; and
transmitting the control information on the control channel from the access point, wherein at least two of the subchannels are operated at different data rates.

2. The method of claim 1 wherein the control information is transmitted in a segment of a data frame specifically allocated for the control channel.

3. The method of claim 1 wherein each different data rate is associated with a different set of operating parameters.

4. The method of claim 3 wherein the operating parameters are selected from the group consisting of a code rate, a modulation scheme, and a signal-to-noise ratio (SNR).

5. The method of claim 1 wherein the control information is transmitted on the plurality of subchannels sequentially in an order from a subchannel with a lowest data rate to a subchannel with a highest data rate.

6. The method of claim 5 wherein the control information transmitted on one of the subchannels includes a field to indicate whether the control information is also transmitted on other subchannels.

7. The method of claim 6 wherein the field comprises a plurality of bits each of which corresponds to a particular subchannel and is used to indicate whether the corresponding subchannel is present in the segment allocated for transmitting the control information.

8. The method of claim 1 wherein the one or more selection criteria are selected from the group consisting of a first criterion corresponding to a link quality associated with the respective user terminal, a second criterion corresponding to quality of service requirements associated with the respective user terminal, and a third criterion corresponding to a subchannel preference indicated by the respective user terminal.

9. A method for processing information in a communication system, comprising:
segregating, at an access point, a control channel into a plurality of subchannels;
transmitting control information on the control channel, wherein at least two of the subchannels are operated at different data rates, the control information including resource allocation information from the access point to a user terminal on a particular subchannel of the plurality of subchannels selected for the user terminal, based on one or more selection criteria; and
decoding, at the user terminal, one or more subchannels of the plurality of subchannels to obtain control information designated for the user terminal.

10. The method of claim 9 wherein decoding comprises:
performing a decoding procedure to decode the one or more subchannels, starting with a subchannel operated at a lowest data rate, until at least one of a plurality of conditions is met.

11. The method of claim 10 further comprising:
terminating the decoding procedure if one of the plurality of conditions is met.

12. The method of claim 11 wherein the plurality of conditions includes a first condition indicating a failure to correctly decode one of the plurality of subchannels.

13. The method of claim 11 wherein the plurality of conditions includes a second condition indicating that the control information designated for the user terminal has been obtained from one of the plurality of subchannels.

14. The method of claim 11 wherein the plurality of conditions includes a third condition indicating that all subchannels have been processed.

15. The method of claim 10 wherein performing the decoding procedure comprises:
determining whether information transmitted on a subchannel has been correctly received, based on a quality metric corresponding to the respective subchannel.

16. The method of claim 15 wherein the quality metric comprises a cyclic redundancy check (CRC).

17. The method of claim 10 wherein performing the decoding procedure comprises:
determining whether the control information designated for the user terminal is present in the respective subchannel, based on an identifier associated with the user terminal.

18. The method of claim 17 wherein the identifier comprises a Medium Access Control (MAC) identifier.

19. The method of claim 9 wherein the one or more selection criteria are selected from the group consisting of a first criterion corresponding to operating conditions of the respective user terminal, a second criterion corresponding to quality of service requirements associated with the respective user terminal, and a third criterion corresponding to a subchannel preference indicated by the respective user terminal.

20. An apparatus for processing information in a communication system, comprising:
means for partitioning, at an access point, a control channel that is used for transmitting control information into a plurality of subchannels;
means for selecting, for each of one or more user terminals, one of the subchannels to be used for transmitting the control information from the access point to the respective user terminal, based on one or more selection criteria; and
means for transmitting the control information on the control channel, wherein at least two of the subchannels are operated at different data rates.

21. The apparatus of claim 20 wherein each subchannel is associated with a distinct set of operating parameters including a code rate, a modulation scheme, and an SNR.

22. The apparatus of claim 20 wherein the plurality of subchannels are transmitted sequentially in an order from a subchannel with a lowest data rate to a subchannel with a highest data rate.

23. The apparatus of claim 22 wherein a subchannel that is transmitted first in the plurality of subchannels includes a field to indicate whether other subchannels are also being transmitted.

24. The apparatus of claim 20 wherein the one or more selection criteria including a first criterion corresponding to a link quality associated with the respective user terminal, a second criterion corresponding to quality of service requirements associated with the respective user terminal, and a third criterion corresponding to a subchannel preference indicated by the respective user terminal.

25. An apparatus for processing information in a communication system, comprising:
means for segregating, at an access point, a control channel into a plurality of subchannels;
means for transmitting control information on the control channel, wherein at least two of the subchannels are operated at different data rates, the control information including resource allocation information from the access point to a user terminal on a particular subchannel of the plurality of subchannels selected for the user terminal, based on one or more selection criteria; and
means for decoding, at the user terminal, one or more subchannels of the plurality of subchannels to obtain control information designated for the user terminal.

26. The apparatus of claim 25 wherein the means for decoding comprises:
means for performing a decoding procedure to decode the one or more subchannels, starting with a subchannel operated at a lowest data rate, until at least one of a plurality of c

Assignees

• Walton J Rodney
• Ketchum John W
• Qualcomm Inc

Inventors

• Walton J Rodney
• Ketchum John W

Classifications

• H04W72/23 Primary

  in the downlink direction of a wireless link, i.e. towards a terminal · CPC title

• H04W72/20

  Control channels or signalling for resource management · CPC title

• H04W84/12

  WLAN [Wireless Local Area Networks] · CPC title

• H04L1/0009

  by adapting the channel coding (H04L1/1812 takes precedence) · CPC title

• H04L1/004

  by using forward error control (H04L1/0618 takes precedence; coding, decoding or code conversion, for error detection or correction H03M13/00) · CPC title