Method and apparatus for using uplink control information for inter-cell decoding and interference cancellation

Patent metadata

Field	Value
Publication number	US-9265049-B2
Application number	US-49846809-A
Country	US
Kind code	B2
Filing date	Jul 7, 2009
Priority date	Jul 11, 2008
Publication date	Feb 16, 2016
Grant date	Feb 16, 2016

Abstract

Techniques for supporting data transmission on the uplink in a wireless network are described. In an aspect, a user equipment (UE) may send a data transmission to a serving base station and may send uplink control information (UCI) to a non-serving base station. The UCI may include pertinent information to allow the non-serving base station to process the data transmission from the UE. In one design, the UCI may allow the non-serving base station to estimate the interference due to the data transmission from the UE and to cancel the interference at the non-serving base station. The interference cancellation may improve the received signal quality at the non-serving base station. After the interference cancellation, the non-serving base station may process a data transmission from another UE served by the base station.

First claim

What is claimed is:

1. A method for wireless communication, comprising:
generating a data transmission at a user equipment (UE) for transmitting over uplink resources allocated by a serving base station to the UE;
generating uplink control information (UCI) at the UE for a non-serving base station, wherein the UCI includes information for enabling the non-serving base station to cancel interference caused by the data transmission, wherein the information includes at least an indication of the uplink resources, and wherein the UCI includes a reverse rate indicator that indicates a rate selected by the UE;
sending the UCI from the UE to the non-serving base station over UCI resources allocated between the UE and the non-serving base station; and
sending the data transmission over the uplink resources.

2. The method of claim 1 , further comprising:
receiving from a serving base station an uplink grant comprising at least one parameter for the data transmission over the uplink resources, wherein the generating the UCI for the non-serving base station is based on the uplink grant from the serving base station.

3. The method of claim 1 , further comprising:
sending the rate to the serving base station.

4. The method of claim 1 , further comprising receiving an allocation of the UCI resources from the serving base station.

5. The method of claim 4 , further comprising receiving an allocation of the UCI resources from the non-serving base station.

6. The method of claim 1 , wherein the sending the UCI comprises:
generating a first waveform based on the UCI; and
superimposing the first waveform on a second waveform for the data transmission.

7. The method of claim 1 , wherein the UCI comprises a UE identity, a serving cell identity, resource information, hybrid automatic retransmission request (HARQ) information, pilot information, or any combination thereof.

8. The method of claim 1 , further comprising:
sending a cyclic redundancy check (CRC) for the UCI to the non-serving base station.

9. The method of claim 1 , further comprising:
determining whether to send the UCI based on received signal strength of the non-serving base station at the UE.

10. An apparatus for wireless communication, comprising:
means for generating a data transmission at a user equipment (UE) for transmitting over uplink resources allocated by a serving base station to the UE;
means for generating uplink control information (UCI) at the UE for a non-serving base station, wherein the UCI includes information for enabling the non-serving base station to cancel interference caused by the data transmission, wherein the information includes at least an indication of the uplink resources, and wherein the UCI includes a reverse rate indicator that indicates a rate selected by the UE;
means for sending the UCI from the UE to the non-serving base station over UCI resources allocated between the UE and the non-serving base station; and
means for sending the data transmission over the uplink resources.

11. The apparatus of claim 10 , further comprising:
means for receiving from a serving base station an uplink grant comprising at least one parameter for the data transmission over the uplink resources, wherein the means for generating the UCI for the non-serving base station is based on the uplink grant from the serving base station.

12. The apparatus of claim 10 , further comprising:
means for sending the rate to the serving base station.

13. An apparatus for wireless communication, comprising:
at least one processor configured to:
send a data transmission from a user equipment (UE) to a serving base station over uplink resources allocated by the serving base station to the UE;
generate uplink control information (UCI) for a non-serving base station, wherein the UCI enables the non-serving base station to cancel interference caused by the data transmission, wherein the information includes at least an indication of the uplink resources, and wherein the UCI includes a reverse rate indicator that indicates a rate selected by the UE; and
send the UCI from the UE to the non-serving base station over UCI resources allocated between the UE and the non-serving base station.

14. The apparatus of claim 13 , wherein the at least one processor is configured to receive from the serving base station an uplink grant comprising at least one parameter for the data transmission over the uplink resources, and to generate the UCI for the non-serving base station based on the uplink grant from the serving base station.

15. The apparatus of claim 13 , wherein the at least one processor is configured to send the rate to the serving base station.

16. A non-transitory computer-readable medium having computer-executable code recorded thereon, the code comprising:
code for causing at least one computer to send a data transmission from a user equipment (UE) to a serving base station over uplink resources allocated by the serving base station to the UE;
code for causing the at least one computer to generate uplink control information (UCI) for a non-serving base station, wherein the UCI enables the non-serving base station to cancel interference caused by the data transmission, wherein the information includes at least an indication of the uplink resources, and wherein the UCI includes a reverse rate indicator that indicates a rate selected by the UE; and
code for causing the at least one computer to send the UCI from the UE to the non-serving base station over UCI resources allocated between the UE and the non-serving base station.

17. A method for wireless communication, comprising:
receiving a first data transmission from a first user equipment (UE) at a first base station over uplink resources allocated by the first base station to the first UE, the first UE being served by the first base station;
receiving, from a second UE, uplink control information (UCI) associated with the second UE at the first base station over UCI resources allocated between the second UE and the first base station, the second UE not being served by the first base station, wherein the UCI includes a reverse rate indicator that indicates a rate selected by the second UE;
based on the UCI, performing, at the first base station, interference cancellation of interference caused by a second data transmission from the second UE, the second data transmission being sent by the second UE to a second base station serving the second UE; and
processing the first data transmission from the first UE after the interference cancellation.

18. The method of claim 17 , wherein the performing interference cancellation comprises:
processing a received signal at the first base station based on the UCI to obtain decoded data for the second data transmission from the second UE,
estimating the interference caused by the second data transmission based on the decoded data, and
subtracting the estimated interference from the received signal to obtain an interference-canceled signal.

19. The method of claim 17 , wherein the performing interference cancellation comprises:
estimating the interference caused by the second data transmission based on a received signal at the first base station and the UCI, without decoding the second data transmission, and
subtracting the estimated interference from the received signal to obtain an interference-canceled signal.

20. The method of claim 17 further comprising:
processing, at the first base station, the second data transmission by:
decoding the sec

Assignees

• Palanki Ravi
• Gorokhov Alexei Y
• Bhushan Naga
• Qualcomm Inc

Inventors

• Palanki Ravi
• Gorokhov Alexei Y
• Bhushan Naga

Classifications

• H04W72/20

  Control channels or signalling for resource management · CPC title

• H04W72/541 Primary

  using the level of interference · CPC title

• H04B7/022 Primary

  Site diversity; Macro-diversity (using two or more spaced independent antennas H04B7/04) · CPC title

• H04W72/0406

  Electricity · mapped topic

• H04W48/08

  Access restriction or access information delivery, e.g. discovery data delivery (signalling during connection H04W76/00) · CPC title