POWER CONTROL METHOD, APPARATUS, AND SYSTEM

• US 20160013883A1
• Filed: 09/17/2015
• Published: 01/14/2016
• 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
• Granted Patent: US 10,075,260 B2
• Time in Patent Office: Days
• US Class Current: 1/1
• 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, 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, and K indicates a quantity of subcarriers; 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 the acquiring, by a vectoring control entity, a power control factor D_ii^k of an i^th transmit end on a k^th subcarrier, comprising:

sending, by the vectoring control entity, the power control factor D_ii^k to an i^th receive end, wherein the i^th receive end is one transceiver, corresponding to the i^th transmit end, of M transceivers located at a far 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 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 sends the modified power gain factor g′

_i^k to the i^th transmit end.

3. The method according to claim 1, wherein the acquiring, by a vectoring control entity, a power control factor D_ii^k of an i^th transmit end on a k^th subcarrier 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 the sending the power control factor D_ii^k to the i^th transmit end, or after the sending, by the vectoring control entity, the power control factor D_ii^k to an i^th receive end, 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, 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; 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 the modifying the power gain factor g_i^k of the current transmit signal, 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, corresponding to the i^th transmit end, of M transceivers located at a far 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 the modifying the power gain factor g_i^k of the current transmit signal, comprising:

sending, by the i^th transmit end, the modified power gain factor g′

_i^k to an i^th receive end, so that the i^th receive end updates 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, and sends the updated physical layer parameter to the i^th transmit end; and

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 the modifying the power gain factor g_i^k of the current transmit signal, 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, 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, and the i^th receive end is one transceiver, corresponding to the i^th transmit end, of M transceivers located at a far 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 the sending the modified power gain factor g′

_i^k to the i^th transmit end, 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 the sending the modified power gain factor g′

_i^k to the i^th transmit end, 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 power control apparatus, located at a vectoring control entity and applied in a vectoring crosstalk cancellation system, comprising:

an acquiring module, 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; and

a sending module, configured to send, to the i^th transmit end, the power control factor D_ii^k acquired by the acquiring module, 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 apparatus according to claim 12, wherein after the acquiring module acquires the power control factor D_ii^k of the i^th transmit end on the k^th subcarrier,

the sending module is further configured to send the power control factor D_ii^k to an i^th receive end, wherein the i^th receive end is one transceiver, corresponding to the i^th transmit end, of M transceivers located at a far 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 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 sends the modified power gain factor g′

_i^k to the i^th transmit end.

14. The apparatus according to claim 12, wherein the acquiring module is specifically configured to:

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

calculate 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 according to claim 12, further comprising:

a receiving module, configured to receive a power limit response message sent by the i^th transmit end.

16. A power control apparatus, located at transmit end and 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 power control apparatus comprises:

a receiving module, 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, 1≦

i≦

M, i indicates a serial number of the transmit end, 1≦

k≦

K, and K indicates a quantity of subcarriers; and

a modifying module, configured to;

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, 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.

17. The apparatus according to claim 16, wherein after the modifying module modifies the power gain factor g_i^k of the current transmit signal, the apparatus further comprises:

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

_i^k modified by the modifying module, wherein the corresponding receive end is one transceiver, corresponding to the transmit end, of M transceivers located at a far end; and

a sending module, configured to send, to the corresponding receive end, the physical layer parameter updated by the update module, so that the corresponding receive end accepts the updated physical layer parameter, and returns a physical layer parameter update response message to the transmit end.

18. The apparatus according to claim 16, wherein after the modifying module modifies the power gain factor g_i^k of the current transmit signal,

the sending module is further configured to send the modified power gain factor g′

_i^k to the corresponding receive end, so that the corresponding receive end 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 sends the updated physical layer parameter to the transmit end; and

the receiving module is further configured to receive the updated physical layer parameter sent by the corresponding receive end, so that the sending module sends a physical layer parameter update response message to the corresponding receive end.

19. The apparatus according to claim 16, wherein after the modifying module modifies the power gain factor g_i^k of the current transmit signal,

the sending module is further configured to send a power limit response message to the vectoring control entity.

20. A power control apparatus, located at a receive end and applied in a vectoring crosstalk cancellation system, wherein the receive end is one transceiver of M transceivers located at a far end, and the power control apparatus comprises:

a receiving module, 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, corresponding to the receive end, of M transceivers located at a central office end, 1≦

k≦

K, and K indicates a quantity of subcarriers;

a modifying module, configured to;

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

a sending module, configured to send the modified power gain factor g′

_i^k to the i^th transmit end.

21. The apparatus according to claim 20, wherein before the sending module sends the modified power gain factor g′

_i^k to the i^th transmit end, the apparatus further comprises;

an update module, configured to update 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 sending module is further configured to 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

the receiving module is further configured to receive a physical layer parameter update response message sent by the i^th transmit end.

22. The apparatus according to claim 20, wherein after the sending module sends the modified power gain factor g′

_i^k to the i^th transmit end,

the receiving module is further configured 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

the sending module is further configured to return 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 following steps are executed;

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; 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.

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 following steps are executed;

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, i indicates a serial number of the transmit end, 1≦

k≦

K, and K indicates a quantity of subcarriers; 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.

25. A receive end, applied in a vectoring crosstalk cancellation system, wherein the receive end is one transceiver of M transceivers located at a far 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 following steps are executed;

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, corresponding to the receive end, of M transceivers located at a central office end, 1≦

k≦

K, and K indicates a quantity of subcarriers;

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.