Power control method, apparatus, and system

Patent metadata

Field	Value
Publication number	US-10075260-B2
Application number	US-201514857616-A
Country	US
Kind code	B2
Filing date	Sep 17, 2015
Priority date	Mar 22, 2013
Publication date	Sep 11, 2018
Grant date	Sep 11, 2018

Abstract

The present invention discloses a power control method, apparatus, and system. A vectoring control entity acquires a power control factor D ii k of an i th transmit end on a k th subcarrier, where the i th transmit end is one transceiver of M transceivers located at a central office end, 1≤k≤K, and K indicates a quantity of subcarriers; and sends the power control factor D ii k to the i th transmit end, so that if it is determined, according to the power control factor D ii k , that the power control factor D ii k is less than a power gain factor g i k , of a current transmit signal of the i th transmit end, on the k th subcarrier, the i th transmit end modifies the power gain factor g i k of the current transmit signal, so that a modified power gain factor g′ i k is less than or equal to the power control factor D ii k .

First claim

What is claimed is:

1. A power control method, applied in a vectoring crosstalk cancellation system, the method comprising:
acquiring, by a vectoring control entity, a power control factor D ii k of an i th transmit end on a k th subcarrier, wherein the i th transmit end is one transceiver of M transceivers located at a central office end, 1≤k≤K, indicates a quantity of subcarriers in a channel between the i th transmit end and an i th receive end; and
sending the power control factor D ii k to the i th transmit end, so that if it is determined that the power control factor D ii k is less than a power gain factor g i k of a current transmit signal of the i th transmit end on the k th subcarrier, the i th transmit end modifies the power gain factor g i k of the current transmit signal, so that a modified power gain factor g′ i k is less than or equal to the power control factor D ii k .

2. The method according to claim 1 , after acquiring, by the vectoring control entity, the power control factor D ii k of the i th transmit end on the k th subcarrier, the method further comprising:
sending, by the vectoring control entity, the power control factor D ii k to the i th receive end is one transceiver of M transceivers located at a remote end, so that if it is determined that the power control factor D ii k is less than a power gain factor g i k of the current transmit signal of the i th transmit end, on the k th subcarrier, the i th receive end (a) modifies the power gain factor g i k of the current transmit signal, so that a modified power gain factor g′ i k is less than or equal to the power control factor D ii k , and (b) sends the modified power gain factor g′ i k to the i th transmit end.

3. The method according to claim 1 , wherein acquiring, by the vectoring control entity, the power control factor D ii k of the i th transmit end on the k th subcarrier further comprises:
acquiring, by the vectoring control entity, a precoding matrix P k on the k th subcarrier; and
calculating the power control factor D ii k of the i th transmit end on the k th subcarrier by using an i th row vector and an i th column vector of the matrix P k .

4. The method according to claim 2 , after sending the power control factor D ii k to the i th transmit end, or after sending, by the vectoring control entity, the power control factor D ii k to an i th receive end, the method further comprising:
receiving, by the vectoring control entity, a power limit response message sent by the i th transmit end.

5. A power control method, applied in a vectoring crosstalk cancellation system, the method comprising:
receiving, by an i th transmit end, a power control factor D ii k sent by a vectoring control entity, wherein the power control factor D ii k is a power control factor acquired by the vectoring control entity of the i th transmit end on a k th subcarrier, the i th transmit end is one transceiver of M transceivers located at a central office end, 1≤k≤K, and K indicates a quantity of subcarriers in a channel between the i th transmit end and an i th receive end; and
if it is determined that the power control factor D ii k is less than a power gain factor g i k of a current transmit signal of the i th transmit end, on the k th subcarrier, modifying the power gain factor g i k of the current transmit signal, so that a modified power gain factor g′ i k is less than or equal to the power control factor D ii k .

6. The method according to claim 5 , after modifying the power gain factor g i k of the current transmit signal, the method comprising:
updating, by the i th transmit end, a physical layer parameter of a line between the i th transmit end and an i th receive end according to the modified power gain factor g′ i k , wherein the i th receive end is one transceiver of M transceivers located at a remote end; and
sending the updated physical layer parameter to the i th receive end, so that the i th receive end receives the updated physical layer parameter, and returns a physical layer parameter update response message to the i th transmit end.

7. The method according to claim 5 , after modifying the power gain factor g i k of the current transmit signal, the method further comprising:
sending, by the i th transmit end, the modified power gain factor g′ i k to the i th receive end, so that the i th receive end (a) updates a physical layer parameter of a line between the i th transmit end and the i th receive end according to the modified power gain factor g′ i k , and (b) sends the updated physical layer parameter to the i th transmit end;
receiving the updated physical layer parameter sent by the i th receive end; and
sending a physical layer parameter update response message to the i th receive end.

8. The method according to claim 5 , after modifying the power gain factor g i k of the current transmit signal, the method further comprising:
sending, by the i th transmit end, a power limit response message to the vectoring control entity.

9. A power control method, applied in a vectoring crosstalk cancellation system, the method comprising:
receiving, by an i th receive end, a power control factor D ii k sent by a vectoring control entity, wherein the power control factor D ii k is a power control factor acquired by the vectoring control entity of an i th transmit end on a k th subcarrier, the i th transmit end is one transceiver of M transceivers located at a central office end, 1≤k≤K, K indicates a quantity of subcarriers in a channel between the i th transmit end and the i th receive end, and the i th receive end is one transceiver of M transceivers located at a remote end; and
if it is determined that the power control factor D ii k is less than a power gain factor g i k of a current transmit signal of the i th transmit end, on the k th subcarrier, modifying the power gain factor g i k of the current transmit signal, so that a modified power gain factor g′ i k is less than or equal to the power control factor D ii k ; and
sending the modified power gain factor g′ i k to the i th transmit end.

10. The method according to claim 9 , before sending the modified power gain factor g′ i k to the i th transmit end, the method further comprising:
updating, by the i th receive end, a physical layer parameter of a line between the i th transmit end and the i th receive end according to the modified power gain factor g′ i k ;
sending the updated physical layer parameter to the i th transmit end, wherein the updated physical layer parameter comprises the modified power gain factor g′ i k ; and
receiving a physical layer parameter update response message sent by the i th transmit end.

11. The method according to claim 9 , after sending the modified power gain factor g′ i k to the i th transmit end, the method further comprising:
receiving, by the i th receive end, an updated physical layer parameter sent by the i th transmit end, wherein the updated physical layer parameter is a physical layer parameter of a line between the i th transmit end and the i th receive end, updated by the i th transmit end according to the modified power gain factor g′ i k ; and
returning a physical layer parameter update response message to the i th transmit end.

12. A non-transitory, computer readable medium storing instructions for execution by a computer device of a power control apparatus, located in a vectoring crosstalk cancellation system, wherein execution of the instructions by the computer device configures the com

Assignees

• Huawei Tech Co Ltd

Inventors

• Lv Jie
• Wang Xiang

Classifications

• H04L25/03006

  Arrangements for removing intersymbol interference · CPC title

• H04L1/0001 Primary

  Systems modifying transmission characteristics according to link quality, e.g. power backoff (adaptive data allocation for multicarrier modulation H04L5/0044; controlling transmission power for radio systems H04W52/04) · CPC title

• H04W52/346 Primary

  distributing total power among users or channels · CPC title

• H04B3/06 Primary

  by the transmitted signal · CPC title

• H04B3/32

  Reducing cross-talk, e.g. by compensating · CPC title