Data transmission and power control in a multihop relay communication system

• US 8,903,412 B2
• Filed: 03/09/2013
• Issued: 12/02/2014
• Est. Priority Date: 03/16/2007
• Status: Active Grant

• Current Assignee: Qualcomm, Inc.
• Original Assignee: Qualcomm, Inc.
• Inventors: Dayal, Pranav, Ji, Tingfang
• Primary Examiner(s): FARAGALLA, MICHAEL A
• Application Number:
  US13/791,913
• Publication Number:
  US 20130188507A1
• Time in Patent Office: 633 Days
• US Class Current: 455/452.2
• CPC Class Codes: H04L 1/0025 Transmission of mode-switching indication
• CPC Class Codes: H04L 1/0026 Transmission of channel quality indication
• CPC Class Codes: H04L 2001/0092 Error control systems characterised by the topology of the transmission link
• CPC Class Codes: H04W 72/04 Wireless resource allocation

Abstract

Techniques for transmitting data with distributed and centralized scheduling in a multihop relay communication system are described. For distributed scheduling, a relay station may generate and send first channel quality information (CQI) to a base station and receive second CQI from a subscriber station. The relay station may receive data sent by the base station based on the first CQI and may resend the data to the subscriber station based on the second CQI. For centralized scheduling, the relay station may generate first CQI for the base station, receive second CQI from the subscriber station, and send both CQIs to the base station. The relay station may receive data sent by the base station based on the first CQI and may resend the data to the subscriber station based on a scheduling decision determined based on the second CQI. Techniques for distributed and centralized power control are also described.

Claims

1. An apparatus for wireless communication, comprising:

a processor; and

a memory in electronic communication with the processor, the memory embodying instructions, the instructions being executable by the processor to;

estimate link quality based on a transmission received from a first station;

generate first channel quality information (CQI) based on the estimated link quality;

send the first CQI to the first station;

receive second CQI from a second station, the second CQI being different from the first CQI;

receive data sent by the first station according to a first transmission schedule determined by the first station, the first transmission schedule comprising an allocation of radio resources;

identify a second transmission schedule for transmissions to the second station, the second transmission schedule comprising an allocation of radio resources to the second station; and

send the data to the second station using the allocated radio resources based on the second transmission schedule.

2. The apparatus of claim 1, wherein the instructions are executable by the processor to:

receive a pilot from the first station;

estimate link quality for the first station based on the pilot; and

generate the first CQI based on the estimated link quality for the first station.

3. The apparatus of claim 1, wherein the instructions are executable by the processor to:

send a pilot to the second station; and

receive the second CQI generated by the second station based on the pilot.

4. The apparatus of claim 1, wherein the first station schedules transmission of the data from the first station according to the first transmission schedule.

5. The apparatus of claim 4, wherein the at least one processor is configured to perform at least one of assigning radio resources to the second station and selecting a modulation and coding scheme for the second station to schedule transmission of the data to the second station.

6. The apparatus of claim 1, wherein the instructions are executable by the processor to:

schedule transmission of the data to the second station according to the second transmission schedule.

7. The apparatus of claim 1, wherein the first station is a base station and the second station is a subscriber station.

8. The apparatus of claim 1, wherein the instructions to identify the second transmission schedule comprising an allocation of the radio resources to the second station are executable by the processor to:

analyze the second CQI; and

determine the second transmission schedule comprising the allocation of the radio resources for the second station.

9. The apparatus of claim 1, wherein the instructions to identify the second transmission schedule comprising an allocation of the radio resources to the second station are executable by the processor to:

transmit the second CQI to the first station; and

receive the second transmission schedule comprising the allocation of the radio resources for the second station from the first station.

11. The method of claim 9, further comprising:

receiving a first pilot from the first station; and

sending a second pilot to the second station, the first CQI being generated based on the first pilot and the second CQI being generated based on the second pilot.

12. The method of claim 9, further comprising:

scheduling transmission of the data to the second station according to the second transmission schedule.

13. The method of claim 9, wherein identifying the second transmission schedule comprising an allocation of the radio resources to the second station comprises:

analyzing the second CQI; and

determining the second transmission schedule comprising the allocation of the radio resources for the second station.

14. The method of claim 9, wherein identifying the second transmission schedule comprising an allocation of the radio resources to the second station comprises:

transmitting the second CQI to the first station; and

receiving the second transmission schedule comprising the allocation of the radio resources for the second station from the first station.

10. A method for wireless communication, comprising:

estimating link quality based on a transmission received from a first station;

generating first channel quality information (CQI) based on the estimated link quality;

sending the first CQI to the first station;

receiving second CQI from a second station, the second CQI being different from the first CQI;

receiving data sent by the first station according to a first transmission schedule determined by the first station, the first transmission schedule comprising an allocation of radio resources;

identifying a second transmission schedule for transmissions to the second station, the second transmission schedule comprising an allocation of radio resources to the second station; and

sending the data to the second station using the allocated radio resources based on the second transmission schedule.

15. An apparatus for wireless communication, comprising:

means for estimating link quality based on a transmission received from a first station;

means for generating first channel quality information (CQI) based on the estimated link quality;

means for sending the first CQI to the first station;

means for receiving second CQI from a second station, the second CQI being different from the first CQI;

means for receiving data sent by the first station according to a first transmission schedule determined by the first station, the first transmission schedule comprising an allocation of radio resources;

means for identifying a second transmission schedule for transmissions to the second station, the second transmission schedule comprising an allocation of radio resources to the second station; and

means for sending the data to the second station using the allocated radio resources based on the second transmission schedule.

16. The apparatus of claim 15, further comprising:

means for receiving a first pilot from the first station; and

means for sending a second pilot to the second station, the first CQI being generated based on the first pilot and the second CQI being generated based on the second pilot.

17. The apparatus of claim 15, further comprising:

means for scheduling transmission of the data to the second station according to the second transmission schedule.

18. A computer program product comprising a non-transitory computer-readable storage medium storing instructions executable by a processor to:

estimate link quality based on a transmission received from a first station;

generate first channel quality information (CQI) based on the estimated link quality;

send the first CQI to the first station;

receive second CQI from a second station, the second CQI being different from the first CQI;

receive data sent by the first station according to a first transmission schedule determined by the first station, the first transmission schedule comprising an allocation of radio resources;

identify a second transmission schedule for transmissions to the second station, the second transmission schedule comprising an allocation of radio resources to the second station; and

send the data to the second station using the allocated radio resources based on the second transmission.

19. The computer program product of claim 18, wherein the instructions are executable by the processor to:

schedule transmission of the data to the second station according to the second transmission schedule.

20. An apparatus for wireless communication, comprising:

a processor;

a memory in electronic communication with the processor; and

instructions stored in the memory, the instructions being executable by the processor to;

send a pilot to a relay station;

receive first channel quality information (CQI) generated by the relay station based on the pilot;

generate a first transmission schedule comprising an allocation of radio resources to the relay station; and

send data to the relay station using the allocated radio resources, the data being sent by the relay station to a subscriber station according to a second transmission schedule comprising an allocation of radio resources to the subscriber station.

21. An apparatus for wireless communication, comprising:

a processor;

a memory in electronic communication with the processor; and

instructions stored in the memory, the instructions being executable by the processor to;

generate the first channel quality information (CQI) for a first station;

receive second CQI from a second station, the second CQI being different from the first CQI;

send the first CQI and the second CQI to the first station;

receive data sent by the first station according to a first transmission schedule determined by the first station, the first transmission schedule comprising an allocation of radio resources;

receive a second transmission schedule from and determined by the first station, the second transmission schedule identifying a radio resource to allocate to the second station; and

send the data to the second station based on the second transmission schedule.

22. The apparatus of claim 21, wherein the instructions are executable by the processor to:

receive pilot from the first station;

estimate link quality for the first station based on the pilot; and

generate the first CQI based on the estimated link quality for the first station.

23. The apparatus of claim 21, wherein the instructions are executable by the processor to:

send pilot to the second station; and

receive the second CQI generated by the second station based on the pilot.

24. The apparatus of claim 21, wherein the first station schedules transmission of the data from the first station according to the first transmission schedule, and generates the second transmission schedule.

25. The apparatus of claim 21, wherein the second transmission schedule comprises at least one of radio resources assigned to the second station and a modulation and coding scheme selected for the second station.

26. The apparatus of claim 21, wherein the first station is a base station and the second station is a subscriber station.

27. A method for wireless communication, comprising:

generating first channel quality information (CQI) for a first station;

receiving second CQI from a second station, the second CQI being different from the first CQI;

sending the first CQI and the second CQI to the first station;

receiving data sent by the first station according to a first transmission schedule determined by the first station, the first transmission schedule comprising an allocation of radio resources;

receiving a second transmission schedule from and determined by the first station, the second transmission schedule identifying a radio resource to allocate to the second station; and

sending the data to the second station based on the second transmission schedule.

28. The method of claim 27, further comprising:

receiving a first pilot from the first station; and

sending a second pilot to the second station, the first CQI being generated based on the first pilot, and the second CQI being generated based on the second pilot.

29. The method of claim 27, wherein transmission of the data from the first station is scheduled by a base station according to the first transmission schedule, and the second transmission schedule is generated by the base station.

30. An apparatus for wireless communication, comprising:

a processor;

a memory in electronic communication with the processor; and

instructions stored in the memory, the instructions being executable by the processor to;

send a pilot to a relay station;

receive first channel quality information (CQI) and second CQI from the relay station, the first CQI being generated based on the pilot, and the second CQI being sent by a subscriber station to the relay station, the second CQI being different from the first CQI;

determine a transmission schedule, the transmission schedule comprising an allocation of radio resources to allocate to the subscriber station;

send data to the relay station; and

send the transmission schedule to the relay station, the data being sent by the relay station to the subscriber station based on the transmission schedule.