# US 11,121,759 B2 · Techniques for interference-aware beam pair selection

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- Number: US 11,121,759 B2
- Document ID: US11121759B2
- Status: Granted
- Kind: B2
- Application number: 16/859,796
- Filed: 2020-04-27
- Published: 2020-08-13
- Granted: 2021-09-14
- Earliest claimed: 2017-10-27
- Assignees: Huawei Technologies Co., Ltd.
- Applicants: Huawei Technologies Co., Ltd.
- Inventors: Mario Hernán Castañeda Garcia; Jian Luo; Richard Stirling-Gallacher
- Web page: https://patentgrep.com/patent/US11121759B2

## CPC

- H04B 7/0696: {Determining beam pairs}
- H04B 7/088: {using beam selection}
- H04L 5/0048: {Allocation of pilot signals, i.e. of signals known to the receiver (allocation of control signalling H04L5/0053; use of control signalling H04L5/0091)}
- H04B: TRANSMISSION
- H04L: TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION (arrangements common to telegraphic and telephonic communication H04M)

## Abstract

A processing device in a transmit-receive point for interference-aware beam pair selection, a transmit-receive point and a method are disclosed. The processing device is configured to select a beam pair from a set of candidate beam pairs (i, j), for setting up a communication link from a serving transmit device to a receive device via the selected beam pair, wherein each of the candidate beam pairs comprises a transmit beam j of the serving transmit device and a receive beam i of the receive device, wherein the selection is based on statistics of a usage of one or more interfering transmit beams (m, k) of one or more interfering transmit devices m, and k represents one or more transmit beams.

## Claims

### Claim 1

A processing device in a transmit-receive point for interference-aware beam pair selection, the processing device comprising:
a processor; and
a memory having processor-executable instructions stored thereon which is to be executed by the processor, wherein the instructions cause the processor to:
select a beam pair from a set of candidate beam pairs (i, j), for setting up a communication link from a serving transmit device to a receive device via the selected beam pair,
wherein each of the candidate beam pairs comprises a transmit beam j of the serving transmit device and a receive beam i of the receive device,
wherein the selection is based on statistics of a usage of one or more interfering transmit beams (m, k) of one or more interfering transmit devices m, wherein k represents one or more transmit beams, and i, j, m and k are positive integers,
wherein selecting the beam pair from the set of candidate beam pairs comprises:
determining for each of the candidate beam pairs (i, j) a score SCR(i, j) based on the statistics of the usage of the one or more interfering transmit beams (m, k); and
selecting, from the set of candidate beam pairs, a beam pair that has obtained a highest score.

### Claim 2 (depends on 1)

The processing device of claim 1, wherein the statistics comprise one or more beam usage probability values pmk associated one-to-one with the one or more interfering transmit beams (m, k), each of the beam usage probability values pmk representing a probability of a usage of the respective interfering transmit beam (m, k).

### Claim 3 (depends on 1)

The processing device of claim 1, wherein the processor is configured to determine for each of the candidate beam pairs (i, j) the respective score SCR(i, j) based further on the following:
a signal strength descriptor of the respective candidate beam pair (i, j); and
one or more signal strength descriptors associated one-to-one with one or more interfering beam pairs (i, m, k), each of the one or more interfering beam pairs comprising the receive beam i of the respective candidate beam pair and one of the interfering transmit beams (m, k).

### Claim 4 (depends on 1)

The processing device of claim 1, wherein the score is defined as:
S
⁢
C
⁢
R
⁡
(
i
,
j
)
=
S
i
,
j
∑
m
∈
M
⁢
∑
k
=
1
N
T
,
m
⁢
p
m
,
k
⁢
I
m
,
i
,
k
+
σ
n
2
,
where Si,j denotes a signal strength of the beam pair formed of the j-th transmit beam from the serving transmit device and the i-th receive beam of the receive device, NT,m denotes the number of transmit beams at the m-th interfering transmit device, σn2 denotes a noise variance, M denotes a set of interfering transmit devices for the receive device, pm,k denotes a beam usage probability value representing a probability of a usage of interfering transmit beam (m, k), and Im,i,k denotes interfering signal strength.

### Claim 5 (depends on 1)

The processing device of claim 1, configured to distinguish between the interfering transmit beams of the interfering transmit devices and the transmit beams of the serving transmit device based on transmit device-specific pilot signals.

### Claim 6

A transmit-receive point, comprising:
a processor; and
a memory having processor-executable instructions stored thereon which is to be executed by the processor, wherein the instructions cause the processor to:
receive statistics of a usage of one or more interfering transmit beams (m, k) of one or more interfering transmit devices m, wherein k represents one or more transmit beams, and m and k are positive integers,
wherein the processor is configured to forward the statistics to a user equipment to enable the user equipment to select a beam pair based on the statistics, and further configured to communicate with the user equipment via the selected beam pair.

### Claim 7 (depends on 6)

The transmit-receive point of claim 6, wherein the processor is configured to:
communicate with the user equipment via one or more transmit beams of the transmit-receive point;
forward the statistics to the user equipment via the one or more transmit beams;
receive a transmit beam identifier from the user equipment, the transmit beam identifier indicating a selected transmit beam of the transmit-receive point; and
continue communicating with the user equipment via the selected transmit beam.

### Claim 8

A method for interference-aware beam selection, applied to a processing device comprising a processor, the method comprising:
selecting, a beam pair from a set of candidate beam pairs (i, j), for setting up a communication link from a serving transmit device to a receive device via the selected beam pair,
wherein each of the candidate beam pairs comprises a transmit beam j of the serving transmit device and a receive beam i of the receive device,
wherein the selection is based on statistics of a usage of one or more interfering transmit beams (m, k) of one or more interfering transmit devices m, wherein k represents one or more transmit beams, and i, j, m and k are positive integers,
wherein selecting the beam pair from the set of candidate beam pairs comprises:
determining for each of the candidate beam pairs (i, j) a score SCR(i, j) based on the statistics of the usage of the one or more interfering transmit beams (m, k); and
selecting, from the set of candidate beam pairs, a beam pair that has obtained a highest score.

### Claim 9 (depends on 6)

The transmit-receive point of claim 6, wherein the transmit-receive point is a base station.

### Claim 10 (depends on 8)

The method of claim 8, wherein the statistics comprise one or more beam usage probability values pmk associated one-to-one with the one or more interfering transmit beams (m, k), each of the beam usage probability values pmk representing a probability of a usage of the respective interfering transmit beam (m, k).

### Claim 11 (depends on 8)

The method of claim 8, wherein the determination for each of the candidate beam pairs (i, j) the respective score SCR(i, j) is based further on the following:
a signal strength descriptor of the respective candidate beam pair (i, j); and
one or more signal strength descriptors associated one-to-one with one or more interfering beam pairs (i, m, k), each of the one or more interfering beam pairs comprising the receive beam i of the respective candidate beam pair and one of the interfering transmit beams (m, k).

### Claim 12 (depends on 8)

The method of claim 8, wherein the score is defined as:
S
⁢
C
⁢
R
⁡
(
i
,
j
)
=
S
i
,
j
∑
m
∈
M
⁢
∑
k
=
1
N
T
,
m
⁢
p
m
,
k
⁢
I
m
,
i
,
k
+
σ
n
2
,
where Si,j denotes a signal strength of the beam pair formed of the j-th transmit beam from the serving transmit device and the i-th receive beam of the receive device, NT,m denotes the number of transmit beams at the m-th interfering transmit device, σn2 denotes a noise variance, M denotes a set of interfering transmit devices for the receive device, pm,k denotes a beam usage probability value representing a probability of a usage of interfering transmit beam (m, k), and Im,i,k denotes interfering signal strength.

### Claim 13 (depends on 8)

The method of claim 8, further comprising: distinguishing between the interfering transmit beams of the interfering transmit devices and the transmit beams of the serving transmit device based on transmit device-specific pilot signals.