Signaling of enhanced power control for eIMTA interference mitigation

Patent metadata

Field	Value
Publication number	US-10111188-B2
Application number	US-201414781159-A
Country	US
Kind code	B2
Filing date	May 9, 2014
Priority date	May 10, 2013
Publication date	Oct 23, 2018
Grant date	Oct 23, 2018

Abstract

Methods, systems, and-devices are described for interference mitigation in a time-division duplex(TDD)wireless communication system. First and second subframe types may be identified for TDD subframes to be transmitted using the system. Different power control parameters associated with each subframe type may be identified based on transmission directions in neighboring cells for the particular subframes. One or more TDD subframes to be transmitted may be identified as a first or second subframe type, and power control may be applied to the transmitted subframes according the power control parameter associated with the subframe type. The identification of subframes and power control parameters to be applied to each type of subframe may be transmitted, for example, to a user equipment(UE). The information may be transmitted to a UE, for example, via radio resource control(RRC)signaling or via a physical layer control channel.

First claim

What is claimed is:

1. A method of wireless communication in a time-division duplex (TDD) communication system, comprising:
receiving a bitmap identifying a first group of one or more subframes of a TDD uplink-downlink (UL-DL) configuration having a first subframe type and a second group of one or more subframes of the TDD UL-DL configuration having a second subframe type, wherein the first subframe type corresponds to one or more subframes having UL-UL interference between a serving base station and a neighboring base station, and the second subframe type corresponds to one or more subframes having DL-UL interference between the serving base station and the neighboring base station;
receiving a first indication of a first power control parameter via radio resource control (RRC) signaling, and a second indication of a second power control parameter via Open Loop Power Control (OLPC) signaling;
applying the first power control parameter to the first group of one or more subframes identified in the bitmap as having the first subframe type;
applying the second power control parameter to the second group of one or more subframes identified in the bitmap as having the second subframe type; and
transmitting the one or more subframes to the serving base station.

2. The method of claim 1 , wherein the bitmap is received in radio resource control signaling.

3. The method of claim 1 , wherein the bitmap is received in signaling via a physical layer control channel.

4. The method of claim 3 , wherein the signaling comprises downlink control information (DCI) received on a physical downlink control channel (PDCCH).

5. The method of claim 3 , wherein the first power control parameter comprises an uncompensated UL transmit power and the second power control parameter comprises an adjustment to the UL transmit power according to UL open loop power control parameters.

6. The method of claim 5 , wherein the UL open loop power control parameters comprise a target received power (PO) and a cell specific compensation factor (α).

7. The method of claim 6 , wherein the UL open loop power control parameters comprise separate PO and α parameters for two or more subframes having the second subframe type as identified in the bitmap.

8. An apparatus for wireless communication in a time-division duplex (TDD) communication system, comprising:
means for receiving a bitmap identifying a first group of one or more subframes of a TDD uplink-downlink (UL-DL) configuration and a second group of one or more subframes of the TDD UL-DL configuration having a second subframe type, wherein the first subframe type corresponds to one or more subframes having UL-UL interference between a serving base station and a neighboring base station, and the second subframe type corresponds to one or more subframes having DL-UL interference between the serving base station and the neighboring base station;
means for receiving a first indication of a first power control parameter via radio resource control signaling, and a second indication of a second power control parameter via Open Loop Power Control (OLPC) signaling;
means for applying the first power control parameter to the first group of one or more subframes identified in the bitmap as having the first subframe type;
means for applying the second power control parameter to the second group of one or more subframes identified in the bitmap as having the second subframe type; and
means for transmitting the one or more subframes to the serving base station.

9. The apparatus of claim 8 , wherein the bitmap is received in radio resource control signaling.

10. The apparatus of claim 8 , wherein the bitmap is received in signaling via a physical layer control channel.

11. The apparatus of claim 10 , wherein the signaling comprises downlink control information (DCI) received on a physical downlink control channel (PDCCH).

12. The apparatus of claim 10 , wherein the first power control parameter comprises an uncompensated UL transmit power and the second power control parameter comprises an adjustment to the UL transmit power according to UL open loop power control parameters.

13. The apparatus of claim 12 , wherein the UL open loop power control parameters comprise a target received power and a cell specific compensation factor (α).

14. The apparatus of claim 13 , wherein the UL open loop power control parameters comprise separate PO and α parameters for two or more subframes having the second subframe type as identified in the bitmap.

15. An apparatus for wireless communication in a time division duplex (TDD) wireless communication system, comprising:
a processor;
memory in electronic communication with the processor; and
instructions being stored in the memory, the instructions being executable by the processor to:
receive a bitmap identifying a first group of one or more subframes of a TDD uplink-downlink (UL-DL) configuration and a second group of one or more subframes of the TDD UL-DL configuration having a second subframe type, wherein the first subframe type corresponds to one or more subframes having UL-UL interference between a serving base station and a neighboring base station, and the second subframe type corresponds to one or more subframes having DL-UL interference between the serving base station and the neighboring base station;
receive a first indication of a first power control parameter via radio resource control signaling, and a second indication of a second power control parameter via Open Loop Power Control (OLPC) signaling;
apply the first power control parameter to the first group of one or more subframes identified in the bitmap as having the first subframe type;
apply the second power control parameter to the second group of one or more subframes identified in the bitmap as having the second subframe type; and
transmit the one or more subframes to the serving base station.

16. The apparatus of claim 15 , wherein the bitmap is received in radio resource control signaling.

17. The apparatus of claim 15 , wherein the bitmap is received in signaling via a physical layer control channel.

18. The apparatus of claim 17 , wherein the signaling comprises downlink control information (DCI) received on a physical downlink control channel (PDCCH).

19. The apparatus of claim 17 , wherein the first power control parameter comprises an uncompensated UL transmit power and the second power control parameter comprises an adjustment to the UL transmit power according to UL open loop power control parameters.

20. The apparatus of claim 19 , wherein the UL open loop power control parameters comprise a target received power and a cell specific compensation factor (α).

21. The apparatus of claim 20 , wherein the UL open loop power control parameters comprise separate PO and α parameters for two or more subframes having the second subframe type as identified in the bitmap.

22. A computer program product for wireless communication in a time division duplex (TDD) wireless communication system, the computer program product comprising a non-transitory computer-readable medium storing instructions executable by a processor to:
receive a bitmap identifying a first group of one or more subframes of a TDD uplink-downlink (UL-DL) configuration and a second group of one or more subframes of the TDD UL-DL configuration having a second subframe type, wherein the first subframe type corresponds to one or more subframes having UL-UL interference between a serving base station and a

Assignees

• Qualcomm Inc

Inventors

• Feng Minghai
• Wang Neng
• Wei Chao
• Hou Jilei

Classifications

• H04W52/10

  Open loop power control · CPC title

• H04L5/1469

  using time-sharing · CPC title

• H04W52/54 Primary

  Signalisation aspects of the TPC commands, e.g. frame structure · CPC title

• H04W52/146

  Uplink power control · CPC title

• H04W52/241

  taking into account channel quality metrics, e.g. SIR, SNR, CIR or Eb/lo · CPC title