Cross link interference measurement for wireless communications in 5G or other next generation network

Patent metadata

Field	Value
Publication number	US-10477420-B2
Application number	US-201715406428-A
Country	US
Kind code	B2
Filing date	Jan 13, 2017
Priority date	Jan 13, 2017
Publication date	Nov 12, 2019
Grant date	Nov 12, 2019

Abstract

A cross link interference (CLI) measurement system is disclosed. The cross link interference measurement system can measure both unconstrained CLI that do not require any special constraints on the frame structure, and constrained CLI that does require special constraints on the frame structure (e.g., measurement gaps). The system does this in part by not only measuring reference signal received powers, but also determining load based on a power scaling of a reference signal and based on angle of arrival determinations.

First claim

What is claimed is:

1. A receiver device, comprising:
a processor; and
a memory that stores executable instructions that, when executed by the processor, facilitate performance of operations, comprising:
measuring a signal strength of a first transmission received from a first transmitter device;
measuring an angle of arrival of a second transmission received from a second transmitter device during a period of time, wherein the second transmission is received during a measurement gap in a frame;
determining a cross-link interference of the second transmission based on the angle of arrival of the second transmission; and
determining a degradation level of a signal link associated with the first transmission based on a function of a difference between the signal strength of the first transmission and the cross-link interference associated with the angle of arrival of the second transmission.

2. The receiver device of claim 1 , wherein the receiver device is a first mobile device, and the second transmitter device is a second mobile device.

3. The receiver device of claim 2 , wherein the determining the cross-link interference of the second transmission comprises:
measuring the cross-link interference of the second transmission during the measurement gap among a base station device, the first mobile device and the second mobile device.

4. The received device of claim 1 , wherein the receiver device is a first base station device, and wherein the second transmitter device is a second base station device.

5. The receiver device of claim 4 , wherein the determining the cross-link interference of the second transmission comprises:
measuring the cross-link interference of the second transmission during the measurement gap between the first base station device, the second base station device and a mobile device.

6. The receiver device of claim 1 , wherein the operations further comprise:
adjusting time slots of downlink and uplink periods in response to the determining of the degradation level.

7. The receiver device of claim 1 , wherein the determining the cross-link interference of the second transmission further comprises:
receiving a reference signal from the second transmitter device;
measuring a power of the reference signal;
determining a load on the second transmitter device as a function of the power of the reference signal; and
estimating the cross-link interference based on the load.

8. The receiver device of claim 7 , wherein the determining the load comprises:
determining a number of antennas associated with the receiver device and respective received powers of the antennas based on the power of the reference signal.

9. The receiver device of claim 1 , wherein the measuring the angle of arrival of the second transmission comprises:
measuring a differential angle of arrival of the second transmission; and
determining the cross-link interference based on differential angle of arrival information, comprising the differential angle of arrival, measured over the period of time.

10. The receiver device of claim 9 , wherein the operations further comprise:
sending the differential angle of arrival information associated with the second transmission to a base station device.

11. The receiver device of claim 1 , wherein the operations further comprise:
determining multi-antenna processing information associated with the second transmission, and wherein the multi-antenna processing information comprises a beam identification and precoder information applicable to the second transmission.

12. A receiver device, comprising:
a processor; and
a memory that stores executable instructions that, when executed by the processor, facilitate performance of operations, comprising:
receiving, via an over the air connection, a reference signal from a first transmitter device via antennas of the receiver device, wherein the receiving the reference signal comprises receiving the reference signal during a measurement gap in a frame;
determining respective powers of the reference signal corresponding to the antennas based on a function associated with the antennas;
determining a load at the first transmitter device based on the respective powers of the reference signal;
measuring an angle of arrival of the reference signal during an interval of time;
estimating a cross-link interference based on the angle of arrival and the load of the first transmitter device;
measuring signal strength of a signal transmitted by a second transmitter device; and
estimating degradation of the signal based on the signal strength and the cross-link interference associated with the angle of arrival and the load of the first transmitter device.

13. The receiver device of claim 12 , wherein the function is a square root function.

14. The receiver device of claim 12 , wherein the receiver device and the first transmitter device are mobile devices.

15. The receiver device of claim 14 , wherein the reference signal is received during the measurement gap between a base station device and the mobile devices.

16. A method, comprising:
measuring, by a receiver device comprising a processor, a signal strength of a first transmission received from a first transmitter device;
measuring, by the receiver device, angle of arrival data indicative of an angle of arrival of a second transmission received from a second transmitter device during a period of time, wherein the second transmission is received during a measurement gap in a frame;
estimating, by the receiver device, a cross-link interference of the second transmission based on the angle of arrival data associated with the second transmission; and
determining, by the receiver device, a degree of degradation of a signal link associated with the first transmission based on a function of a difference between the signal strength of the first transmission and the cross-link interference estimated based on the angle of arrival data associated with the second transmission.

17. The method of claim 16 , further comprising:
facilitating, by the receiver device, dynamic time division duplex operations based on the degree of degradation.

18. The method of claim 16 , further comprising:
receiving, by the receiver device, a reference signal from the second transmitter device;
measuring, by the receiver device, a power of the reference signal; and
determining, by the receiver device, a load on the receiver device based on a function of the power of the reference signal, wherein the measuring the cross-link interference comprises determining the cross-link interference based on the load.

19. The method of claim 18 , further comprising:
determining, by the receiver device, an estimated power for an antenna based on the power of the reference signal and a number of antennas associated with the receiver device.

20. The method of claim 16 , wherein the measuring the cross-link interference comprises aggregating the angle of arrival data over the period of time.

Assignees

• At & T Ip I Lp

Inventors

• Ghosh Arunabha
• Novlan Thomas
• Wang Xiaoyi

Classifications

• H04W72/542

  using measured or perceived quality · CPC title

• H04J11/0023

  Interference mitigation or co-ordination (direct sequence spread spectrum [DSSS] systems H04B1/7097; frequency hopping H04B1/713; allocation criteria for ingress interference avoidance H04L5/0062; frequency allocation criteria for requirements on out-of-channel emissions H04L5/0066; arrangements for removing intersymbol interference or baseband equalisers H04L25/03006; peak power aspects in multicarrier modulation H04L27/2614; power management H04W52/00; traffic scheduling H04W72/54, H04W72/541) · CPC title

• H04B7/024

  Co-operative use of antennas of several sites, e.g. in co-ordinated multipoint or co-operative multiple-input multiple-output [MIMO] systems · CPC title

• H04B17/345

  Interference values ({signal-to-interference ratio [SIR] or carrier-to-interference ratio [CIR]} H04B17/336) · CPC title

• H04W24/08 Primary

  Testing, {supervising or monitoring} using real traffic · CPC title