System and Method for Power Control

Patent metadata

Field	Value
Publication number	US-2016100370-A1
Application number	US-201514868031-A
Country	US
Kind code	A1
Filing date	Sep 28, 2015
Priority date	Oct 2, 2014
Publication date	Apr 7, 2016
Grant date	—

Abstract

A method of communicating in a wireless system includes receiving resource scheduling information indicating a location of a resource for transmitting a packet, an indication of a target power level, and an indication of a first bandwidth, receiving an indication of a first transmission power level, determining a second transmission power level in accordance with the target power level, and at least one of the first bandwidth and the first transmission power level, and transmitting the packet at the location of the resource with the second transmission power level.

First claim

What is claimed is:

1 . A method of communicating in a wireless system, the method comprising:
receiving, by a station, resource scheduling information indicating a location of a resource for transmitting a packet, an indication of a target power level, and an indication of a first bandwidth; receiving, by the station, an indication of a first transmission power level; determining, by the station, a second transmission power level in accordance with the target power level, and at least one of the first bandwidth and the first transmission power level; and transmitting, by the station, the packet at the location of the resource with the second transmission power level.

2 . The method of claim 1 , the resource scheduling information, the indication of the target power level, and the indication of the first bandwidth are received in a first frame and the indication of the first transmission power level is received in a second frame.

3 . The method of claim 2 , wherein the first frame is a trigger frame and the second frame is a beacon frame.

4 . The method of claim 2 , wherein the first frame and the second frame are received at different times.

5 . The method of claim 1 , wherein the resource scheduling information, the indication of the target power level, the indication of the first bandwidth and the indication of the first transmission power level are received in one frame.

6 . The method of claim 1 , wherein determining the second transmission power level comprises:
measuring a receive power level; determining a path loss in accordance with the receive power level; and determining the second transmission power level in accordance with the path loss.

7 . The method of claim 6 , wherein determining the path loss comprises evaluating
PL= P DL — TX — TOTAL +10*log 10 ( BW DL /BW DL — TOTAL )− P DL — RX ,

where PL is the path loss, P DL — TX — TOTAL is the first transmission power level, P DL — RX is the receive power level, BW DL is a second bandwidth used to measure the receive power level, and BW DL — TOTAL is the first bandwidth.

8 . The method of claim 7 , wherein the resource scheduling information, the indication of the target power level, and the indication of the first bandwidth are received on the second bandwidth.

9 . The method of claim 7 , wherein determining the second transmission power level in accordance with the path loss comprises evaluating
P UL — TX =min( P UL — TX — MAX ,P UL — RX — TARGET +PL),
where P UL — TX is the second transmission power level, P UL — TX — MAX is a maximum value of the second transmission power level, P UL — RX — Target is the target power level, PL is the path loss, and min( ) is a minimum function which returns a minimum value of its input elements.

10 . The method of claim 6 , wherein determining the path loss comprises evaluating
PL= P DL — TX −P DL — RX ,
where PL is the path loss, and P DL — TX is the first transmission power level, P DL — RX is the receive power level.

11 . A method of communicating in a wireless system, the method comprising:
transmitting, by an access point, resource allocation information indicating a location of a resource for transmitting a packet, an indication of a target power level, and an indication of a first bandwidth; transmitting, by the access point, an indication of a first transmission power level; and receiving, by the access point, the packet at the location of the resource.

12 . The method of claim 11 , wherein the resource allocation information, the indication of the target power level, and the indication of the first bandwidth are transmitted in a trigger frame, and the indication of the first transmission power level is transmitted in a beacon frame.

13 . The method of claim 11 , wherein the resource allocation information, the indication of the target power level, and the indication of the first bandwidth, and the indication of the first transmission power level are transmitted in one frame.

14 . A station adapted to perform power control, the station comprising:
a receiver configured to receive resource scheduling information indicating a location of a resource for transmitting a packet, an indication of a target power level, and an indication of a first bandwidth, and to receive an indication of a first transmission power level; a processor operatively coupled to the receiver, the processor configured to determine a second transmission power level in accordance with the target power level, and at least one of the first bandwidth and the first transmission power level; and a transmitter operatively coupled to the processor, the transmitter configured to transmit the packet at the location of the resource with the second transmission power level.

15 . The station of claim 14 , wherein the processor is configured to measure a receive power level, to determine a path loss in accordance with the receive power level, and to determine the second transmission power level in accordance with the path loss.

16 . The station of claim 15 , wherein the processor is configured to evaluate
PL= P DL — TX — TOTAL +10*log 10 ( BW DL /BW DL — TOTAL )− P DL — RX ,

where PL is the path loss, P DL — TX — TOTAL is the first transmission power level, P DL — RX is the receive power level, BW DL is a second bandwidth used to measure the receive power level, and BW DL — TOTAL is the first bandwidth.

17 . The station of claim 16 , wherein the processor is configured to evaluate
P UL — TX =min( P UL — TX — MAX ,P UL — RX — TARGET +PL),
where P UL — TX is the second transmission power level, P UL — TX — MAX is a maximum value of the second transmission power level, P UL — RX — Target is the target power level, PL is the path loss, and min( ) is a minimum function which returns a minimum value of its input elements.

18 . The station of claim 15 , wherein the processor is configured to evaluate
PL= P DL — TX −P DL — RX ,
where PL is the path loss, and P DL — TX is the first transmission power level, P DL — RX is the receive power level.

19 . The station of claim 14 , wherein the resource scheduling information, the indication of the target power level, and the indication of the first bandwidth are received in a trigger frame and the indication of the first transmission power level is received in a beacon frame.

20 . The station of claim 14 , wherein the resource scheduling information, the indication of the target power level, the indication of the first bandwidth and the indication of the first transmission power level are received in one frame.

21 . An access point comprising:
a transmitter configured to transmit resource allocation information indicating a location of a resource for transmitting a packet, an indication of a target power level, and an indication of a first bandwidth, and to transmit an indication of a first transmission power level; and a receiver operatively coupled to the transmitter, the receiver configured to receive the packet at the location of the resource.

Assignees

• Futurewei Technologies Inc

Inventors

• Rong Zhigang
• Yang Yunsong

Classifications

• H04W72/23

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

• H04W72/0473

  the resource being transmission power · CPC title

• H04W52/242 Primary

  taking into account path loss · CPC title

• H04W52/10

  Open loop power control · CPC title

• H04W52/247 Primary

  where the output power of a terminal is based on a path parameter sent by another terminal · CPC title