Enhanced uplink and downlink power control for LTE TDD eIMTA

Patent metadata

Field	Value
Publication number	US-9794051-B2
Application number	US-201214429766-A
Country	US
Kind code	B2
Filing date	Oct 8, 2012
Priority date	Oct 8, 2012
Publication date	Oct 17, 2017
Grant date	Oct 17, 2017

Abstract

A method, an apparatus, and a computer program product for wireless communication are provided. The apparatus determines an interference type between a time division duplex (TDD) configuration subframe of a serving cell and a corresponding TDD configuration subframe of a neighboring cell, and sets a transmit power for an apparatus in the serving cell based on the interference type. The apparatus in the serving cell may be a user equipment (UE), in which case the apparatus applies a set of uplink (UL) open loop power control parameters for the UE. The apparatus in the serving cell may be a base station (eNB), in which case a DL transmit power is set for the eNB. Depending on the interference type, the DL transmit power may be a fixed, full power DL transmission or an adjusted DL transmission.

First claim

What is claimed is:

1. A method of wireless communication, comprising: determining an interference type between a time division duplex (TDD) configuration subframe of a serving cell and a corresponding TDD configuration subframe of a neighboring cell; and setting a transmit power for an apparatus in the serving cell based on the interference type, wherein the transmit power is increased when the apparatus is configured as a user equipment (UE) and the interference type is a uplink-downlink (UL-DL) interference type as compared to when the interference type is a uplink-uplink (UL-UL) interference type, and the transmit power is decreased when the apparatus is configured as a base station and the interference type is a downlink-uplink (DL-UL) interference type as compared to when the interference type is a downlink-downlink (DL-DL) interference type;
wherein determining an interference type comprises: identifying the interference type as the UL-UL interference type when corresponding subframes of the serving cell and the neighboring cell are UL subframes; and identifying the interference type as the UL-DL interference type when the corresponding subframes of the serving cell and the neighboring cell comprise an UL subframe in the serving cell and a downlink (DL) subframe in the neighboring cell;
wherein determining an interference type comprises: identifying the interference type as the DL-DL interference type when corresponding subframes of the serving cell and the neighboring cell are both DL subframes or both special subframes; and identifying the interference type as the DL-UL interference type when corresponding subframes of the serving cell and the neighboring cell comprise a DL subframe in the serving cell and an UL subframe in the neighboring cell.

2. The method of claim 1 , wherein the apparatus in the serving cell comprises is a UE user equipment (UE), and setting a transmit power comprises applying a set of uplink (UL) open loop power control parameters for the UE.

3. The method of claim 1 , wherein the set of UL open loop control parameters comprises a UE specific component Po and a cell specific parameter α, and applying a set of UL open loop power control parameters comprises applying a first Po in the UL subframe with UL-UL interference type and a second Po in the UL subframe with UL-DL interference type.

4. The method of claim 1 , wherein the set of UL open loop control parameters comprises a UE specific component Po and a cell specific parameter α, and applying a set of UL open loop power control parameters comprises applying a first a in the UL subframe with UL-UL interference type and a second α in the UL subframe with UL-DL interference type.

5. The method of claim 1 , wherein the set of UL open loop control parameters comprises a UE specific component Po and a cell specific parameter α, and applying a set of UL open loop power control parameters comprises: applying a first Po in the UL subframe with UL-UL interference type and a second Po in the UL subframe with UL-DL interference type; and applying a first a in the UL subframe with UL-UL interference type and a second α in the UL subframe with UL-DL interference type.

6. The method of claim 1 , wherein the apparatus in the serving cell comprises is a base station (eNB), and setting the transmit power comprises setting a DL transmit power for the eNB.

7. The method of claims 1 , wherein, for DL-DL interference type DL subframe, setting a DL transmit power comprises setting the DL transmit power at a fixed, full power DL transmission.

8. The method of claim 1 , wherein, for DL-UL interference type DL subframe, setting a DL transmit power comprises adjusting the DL transmit power according to UL open loop power control parameters of the neighboring cell.

9. The method of claim 8 , wherein the UL open loop power control parameters of the neighboring cell comprise a component Po and a cell specific parameter α.

10. An apparatus for wireless communication, comprising: means for determining an interference type between a time division duplex (TDD) configuration subframe of a serving cell and a corresponding TDD configuration subframe of a neighboring cell; and means for setting a transmit power for the apparatus in the serving cell based on the interference type, wherein the transmit power is increased when the apparatus is configured as a user equipment (UE) and the interference type is a uplink-downlink (UL-DL) interference type as compared to when the interference type is a uplink-uplink (UL-UL) interference type, and the transmit power is decreased when the apparatus is configured as a base station and the interference type is a downlink-uplink (DL-UL) interference type as compared to when the interference type is a downlink-downlink (DL-DL) interference type;
wherein the means for determining an interference type is configured to: identify the interference type as the UL-UL interference type when corresponding subframes of the serving cell and the neighboring cell are UL subframes: and identify the interference type as the UL-DL interference type when corresponding subframes of the serving cell and the neighboring cell comprise an UL subframe in the serving cell and a downlink (DL) subframe in the neighboring cell;
wherein the means for determining an interference type is configured to: identify the interference type as the DL-DL interference type when corresponding subframes of the serving cell and the neighboring cell are both DL subframes or both special subframes; and identify the interference type as the DL-UL interference type when corresponding subframe of the serving cell and the neighboring cell comprise a DL subframe in the serving cell and an UL subframe in the neighboring cell.

11. The apparatus of claim 10 , wherein the apparatus in the serving cell is a UE and the means for setting a transmit power is configured to apply a set of uplink (UL) open loop power control parameters for the UE.

12. The apparatus of claim 10 , wherein the set of UL open loop control parameters comprises a UE specific component Po and a cell specific parameter α, and the means for setting a transmit power is configured to apply a first Po for the subframe with UL-UL interference type and a second Po for the subframe with UL-DL interference type.

13. The apparatus of claim 10 , wherein the set of UL open loop control parameters comprises a UE specific component Po and a cell specific parameter α, and the means for setting a transmit power is configured to apply a first a for the subframe with UL-UL interference type and a second α for the subframe with UL-DL interference type.

14. The apparatus of claim 10 , wherein the set of UL open loop control parameters comprises a UE specific component Po and a cell specific parameter α, and the means for setting a transmit power is configured to: apply a first Po for the subframe with UL-UL interference type and a second Po for the subframe with UL-DL interference type; and apply a first a for the subframe with UL-UL interference type and a second α for the subframe with UL-DL interference type.

15. The apparatus of claim 10 wherein the apparatus in the serving cell comprises is a base station (eNB), and the means for setting the transmit power comprise means for setting is configured to set a DL transmit power for the eNB.

16. The apparatus of claim 10 , wherein the means for setting the transmit power is configured to set the DL transmit power at a fixed full power DL transmission in cases of DL-DL interference.

17. The apparatus of claim 10 , wherein the means for setting the transmit power is con

Assignees

• Qualcomm Inc

Inventors

• Feng Minghai
• Guo Jiming
• Wang Neng
• Hou Jilei
• Xu Hao
• Gaal Peter

Classifications

• H04W72/541

  using the level of interference · CPC title

• H04L5/14 Primary

  Two-way operation using the same type of signal, i.e. duplex · CPC title

• H04W52/223

  predicting future states of the transmission · CPC title

• H04W52/10 Primary

  Open loop power control · CPC title

• H04W52/143

  Downlink power control · CPC title