Power control method, apparatus, and system

• US 10,075,260 B2
• Filed: 09/17/2015
• Issued: 09/11/2018
• Est. Priority Date: 03/22/2013
• Status: Active Grant

• Current Assignee: Huawei Technologies Co., Ltd. (Huawei Investment & Holding Co., Ltd.)
• Original Assignee: Huawei Technologies Co., Ltd. (Huawei Investment & Holding Co., Ltd.)
• Inventors: Lv, Jie, Wang, Xiang
• Primary Examiner(s): Phillips, Hassan
• Assistant Examiner(s): Jones, Prenell
• Application Number:
  US14/857,616
• Publication Number:
  US 20160013883A1
• Time in Patent Office: 1,090 Days
• CPC Class Codes: H04B 3/06 by the transmitted signal
• CPC Class Codes: H04B 3/32 Reducing cross-talk, e.g. by compensating
• CPC Class Codes: H04L 1/0001 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 Class Codes: H04L 25/03006 Arrangements for removing intersymbol interference
• CPC Class Codes: H04M 11/062 using different frequency bands for speech and other data
• CPC Class Codes: H04W 52/346 distributing total power among users or channels

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.

Claims

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 computer device to perform a method of power control comprising:

acquiring 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 , and K indicates a quantity of subcarriers in a channel between the i^th transmit end and an i^th receive end; and

sending to the i^th transmit end the acquired power control factor D_ii^k , 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.

13. The non-transitory, computer readable medium according to claim 12 further comprising instructions that, when executed, configure the computer device to :

send the power control factor D_ii^k to an i^th receive end, wherein 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.

14. The non-transitory, computer readable medium according to claim 12 further comprising instructions that, when executed, configure the computer device to:

acquire a precoding matrix P^k on the k^th subcarrier; and

determine 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.

15. The apparatus non-transitory, computer readable medium according to claim 12 further comprising instructions that, when executed, configure the computer device to:

receive a power limit response message sent by the i^th transmit end.

16. A non-transitory, computer readable medium storing instructions for execution by a computer device of a power control apparatus located at a transmit end of a vectoring crosstalk cancellation system, wherein the transmit end is one transceiver of M transceivers located at a central office end of the system, wherein execution of the instructions by the computer device configures the computer device to perform a method of power control comprising:

receiving 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 transmit end on a k^th subcarrier, 1≤

i≤

M, i indicates a serial number of the transmit 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

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 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 transmit end, on the k^th subcarrier.

17. The non-transitory, computer readable medium according to claim 16 further comprising instructions that, when executed, configure the computer device to:

update a physical layer parameter of a line between the transmit end and a corresponding receive end according to the modified power gain factor g′

_i^k, wherein the corresponding receive end is one transceiver of M transceivers located at a remote end; and

send to the corresponding receive end, the updated physical layer parameter, so that the corresponding receive end (a) accepts the updated physical layer parameter, and (b) returns a physical layer parameter update response message to the transmit end.

18. The non-transitory, computer readable medium according to claim 16 further comprising instructions that, when executed, configure the computer device to:

send the modified power gain factor g′

_i^k to the corresponding receive end, so that the corresponding receive end (a) updates a physical layer parameter between a line between the corresponding receive end and the transmit end according to the modified power gain factor g′

_i^k, and (b) sends the updated physical layer parameter to the transmit end; and

receive the updated physical layer parameter sent by the corresponding receive end, so that a physical layer parameter update response message is sent to the corresponding receive end.

19. The non-transitory, computer readable medium according to claim 16 further comprising instructions that, when executed, configure the computer device to:

send a power limit response message to the vectoring control entity.

20. A non-transitory, computer readable medium storing instructions for execution by a computer device of a power control apparatus, located at a receive end of a vectoring crosstalk cancellation system, wherein the receive end is one transceiver of M transceivers located at a remote end of the system, wherein execution of the instructions by the computer device configures the computer device to perform a method of power control comprising:

receiving 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, and K indicates a quantity of subcarriers in a channel between the i^th transmit end and an i^th receive end;

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 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; and

sending the modified power gain factor g′

_i^k to the i^th transmit end.

21. The non-transitory, computer readable medium according to claim 20 further comprising instructions that, when executed, configure the computer device to:

update 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;

wherein

send 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.

22. The non-transitory, computer readable medium according to claim 20 further comprising instructions that, when executed, configure the computer device to:

receive 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 receive end, updated by the i^th transmit end according to the modified power gain factor g′

_i^k; and

send a physical layer parameter update response message to the i^th transmit end.

23. A vectoring control entity, applied in a vectoring crosstalk cancellation system comprising a processor, a memory and a communications bus, wherein the memory stores an instruction for implementing a power control method, and the processor is connected to the memory through the communications bus;

and

when the processor invokes the instruction in the memory, the processor is configured to;

acquire 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, and K indicates a quantity of subcarriers in a channel between the i^th transmit end and an i^th receive end; and

send 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.

24. A transmit end, applied in a vectoring crosstalk cancellation system, wherein the transmit end is one transceiver of M transceivers located at a central office end, and the transmit end comprises a processor, a memory and a communications bus, wherein the memory stores an instruction for implementing a power control method, and the processor is connected to the memory through the communications bus;

and

when the processor invokes the instruction in the memory, the processor is configured to;

receive 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 transmit end on a k^th subcarrier, i indicates a serial number of the transmit 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, modify 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.

25. A receive end, applied in a vectoring crosstalk cancellation system, wherein the receive end is one transceiver of M transceivers located at a remote end, and the receive end comprises a processor, a memory and a communications bus, wherein the memory stores an instruction for implementing a power control method, and the processor is connected to the memory through the communications bus;

and

when the processor invokes the instruction in the memory, the processor is configured to;

receive 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, and K indicates a quantity of subcarriers in a channel between the i^th transmit end and an i^th receive end;

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, modify 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

send the modified power gain factor g′

_i^k to the i^th transmit end.