Method, Apparatus, and Communications System for Reciprocity Calibration Between UEs

• US 20170033951A1
• Filed: 09/16/2016
• Published: 02/02/2017
• Est. Priority Date: 03/18/2014
• Status: Abandoned Application

• Current Assignee: Huawei Technologies Co., Ltd. (Huawei Investment & Holding Co., Ltd.)
• Original Assignee: Huawei Technologies Co., Ltd. (Huawei Investment & Holding Co., Ltd.)
• Inventors: Zhang, Lei, Rong, Lu
• Application Number:
  US15/267,690
• Publication Number:
  US 20170033951A1
• Time in Patent Office: Days
• US Class Current: 1/1
• CPC Class Codes: H04B 17/00 Monitoring; Testing of line transmission systems H04B3/46; arrangements for monitoring or testing transmission systems employing electromagnetic waves other than radio waves H04B10/07
• CPC Class Codes: H04B 17/14 of the whole transmission and reception path, e.g. self-test loop-back
• CPC Class Codes: H04B 17/21 for calibration; for correcting measurements
• CPC Class Codes: H04L 1/0026 Transmission of channel quality indication
• CPC Class Codes: H04L 25/0224 using sounding signals
• CPC Class Codes: H04L 25/0242 using matrix methods
• CPC Class Codes: H04L 5/0048 Allocation of pilot signals, i.e. of signals known to the receiver
• CPC Class Codes: H04L 5/1469 using time-sharing

Abstract

An embodiment discloses a method, an apparatus, and a communications system for reciprocity calibration between UEs. The method includes sending, by a communication device, a first reference signal to a first user equipment UE, so that the first UE estimates first channel information of a first channel between the first UE and the communication device according to the first reference signal and receiving the first channel information fed back by the first UE; receiving a second reference signal sent by the first UE. The method also includes estimating second channel information of a second channel between the communication device and the first UE according to the second reference signal, and performing reciprocity calibration according to the first channel information and the second channel information.

Claims

1. A method comprising:

sending, by a communication device to a first user equipment (UE), a first reference signal;

receiving, by the communication device fed back from the first UE, first channel information of a first channel between the first UE and the communication device according to the first reference signal;

receiving, by the communication device, a second reference signal sent by the first UE;

estimating second channel information of a second channel between the communication device and the first UE according to the second reference signal; and

performing reciprocity calibration according to the first channel information and the second channel information.

2. The method according to claim 1, wherein the communication device is a second UE and wherein the method further comprises:

sending, by the second UE to a base station, before sending the first reference signal, a first calibration request, so that the base station can send scheduling information to the second UE and to the first UE according to the first calibration request, wherein the scheduling information comprises an identifier of the first UE, an identifier of the second UE, and a time-frequency resource.

3. The method according to claim 1, wherein the communication device is a base station and wherein the method further comprises:

receiving, by the base station from the first UE, before sending the first reference signal, a second calibration request.

4. The method according to claim 3, further comprising sending, by the base station to the first UE, scheduling information according to the second calibration request, wherein the scheduling information comprises an identifier of the first UE and a time-frequency resource.

5. The method according to claim 1, wherein performing reciprocity calibration according to the first channel information and the second channel information comprises:

adjusting a reciprocity coefficient, wherein a first channel matrix corresponding to the first channel information is equal to a second channel matrix corresponding to the second channel information.

6. A method comprising:

receiving, by a first user equipment (UE) from a communication device, a first reference signal;

estimating, by the first UE, first channel information of a first channel between the first UE and the communication device according to the first reference signal;

sending, by the first UE to the communication device, the first channel information; and

sending, by the first UE to the communication device, a second reference signal, so that the communication device can estimate second channel information of a second channel between the communication device and the first UE according to the second reference signal and perform reciprocity calibration according to the first channel information and the second channel information.

7. The method according to claim 6, wherein the communication device is a second UE and wherein the method further comprises:

receiving, by the first UE, before receiving the first reference signal, scheduling information sent by a base station according to a first calibration request.

8. The method according to claim 6, wherein the communication device is a base station wherein the method further comprises:

sending, by the first UE to the base station, a second calibration request.

9. The method according to claim 8, further comprising receiving, by the first UE, before receiving the first reference signal, scheduling information sent by the base station according to the second calibration request, wherein the scheduling information comprises an identifier of the first UE and a time-frequency resource.

10. A communication device, comprising:

a processor; and

a non-transitory computer readable storage medium storing a program for execution by the processor, the program including instructions to;

send a first reference signal to a first user equipment (UE);

receive first channel information fed back by the first UE, the first channel information comprising information related to a first channel between the first UE and the communication device according to the first reference signal;

receive a second reference signal sent by the first UE;

estimate second channel information of a second channel between the communication device and the first UE according to the second reference signal; and

perform reciprocity calibration according to the first channel information and the second channel information.

11. The communication device according to claim 10, wherein the communication device is a second UE, wherein the instructions further comprise instructions to send a first calibration request to a base station, so that the base station can send scheduling information to the second UE and to the first UE according to the first calibration request, wherein the scheduling information comprises an identifier of the first UE, an identifier of the second UE, and a time-frequency resource.

12. The communication device according to claim 10, wherein the communication device is a base station and wherein the instructions further comprise instructions to receive a second calibration request sent by the first UE.

13. The communication device according to claim 10, wherein the instructions further comprise instructions to:

adjust a reciprocity coefficient, wherein a first channel matrix corresponding to the first channel information is equal to a second channel matrix corresponding to the second channel information.

14. A user equipment (UE), comprising:

a processor; and

a non-transitory computer readable storage medium storing a program for execution by the processor, the program including instructions to;

receive a first reference signal sent by a communication device, wherein first channel information of a first channel between the UE and the communication device is estimated according to the first reference signal;

send the first channel information to the communication device; and

send a second reference signal to the communication device, so that the communication device can estimate second channel information of a second channel between the communication device and the UE according to the second reference signal and perform reciprocity calibration according to the first channel information and the second channel information.

15. The UE according to claim 14, wherein the communication device is a second UE and wherein the instructions further comprise instructions to receive scheduling information sent by a base station according to a first calibration request, wherein the scheduling information comprises an identifier of the UE, an identifier of the second UE, and a time-frequency resource.

16. The UE according to claim 14, wherein the communication device is a base station, and wherein the instructions further comprise instructions to send a second calibration request to the base station, so that scheduling information can be sent by the base station according to the second calibration request, wherein the scheduling information comprises an identifier of the UE and a time-frequency resource.

17. A communications system comprising:

a communication device comprising;

a first processor; and

a first non-transitory computer readable storage medium storing a program for execution by the first processor, the program including instructions to;

send a first reference signal to a first user equipment (UE);

receive a first channel information fed back by the first UE;

receive a second reference signal sent by the first UE;

estimate second channel information of a second channel between the communication device and the first UE according to the second reference signal; and

perform reciprocity calibration according to the first channel information and the second channel information; and

the first UE comprising;

a second processor; and

a second non-transitory computer readable storage medium storing a program for execution by the second processor, the program including instructions to;

receive the first reference signal sent by the communication device;

estimate first channel information of a first channel between the first UE and the communication device according to the first reference signal;

send the first channel information to the communication device; and

send a second reference signal to the communication device.