# US 2021/0175992 A1 · Method and apparatus for adjacent channel interference mitigation

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- Number: US 2021/0175992 A1
- Document ID: US20210175992A1
- Status: Published application
- Kind: A1
- Application number: 16/703,560
- Filed: 2019-12-04
- Published: 2021-06-10
- Earliest claimed: 2019-12-04
- Assignees: Celona, Inc.
- Applicants: Celona, Inc.
- Inventors: Mehmet Yavuz; Nagi Mahalingam
- Web page: https://patentgrep.com/patent/US20210175992A1

## CPC

- H04J 11/0056: {Inter-base station aspects}
- H04L 5/0094: {Indication of how sub-channels of the path are allocated}
- H04L 5/1469: {using time-sharing}
- H04L 27/2605: {Symbol extensions, e.g. Zero Tail, Unique Word [UW]}
- H04L 27/2691: {involving interference determination or cancellation}
- H04W 16/14: Spectrum sharing arrangements {between different networks}
- H04W 24/02: Arrangements for optimising operational condition
- H04W 24/10: Scheduling measurement reports {; Arrangements for measurement reports}
- H04J: MULTIPLEX COMMUNICATION (transmission in general H04B; peculiar to transmission of digital information H04L5/00; systems for the simultaneous or sequential transmission of more than one television signal H04N7/08; in exchanges H04Q11/00; stereophonic systems H04S)
- H04L: TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION (arrangements common to telegraphic and telephonic communication H04M)
- H04W: WIRELESS COMMUNICATION NETWORKS (broadcast communication H04H; communication systems using wireless links for non-selective communication, e.g. wireless extensions H04M1/72)

## Abstract

Systems and methods for mitigation of cross channel interference are disclosed in which the TDD configuration of a potential cross channel interference source is detected by received signals within the network with which the source interferes. The TDD configuration is then used to synchronize the transmissions from the network with which the source interferes to reduce the interference. In addition, interference is mitigated by providing adaptive guard bands based on results of a radio frequency environmental survey and/or coaxing an interfering user to another channel. Sub-channels can be assigned based on the results of the radio frequency environmental survey and Quality of Service requirements for traffic flows.

## Claims

### Claim 1

A communications system comprising:
a) an interference mitigation unit (IMU) configured to:
i. output Radio Frequency (RF) environmental survey request to cause at least one recipient of the instructions to measure signals received by the recipient;
ii. receive, in response to the RF environmental survey request, Time Division Duplex (TDD) configuration information for the potential source of cross channel interference; and
iii. output the TDD configuration information; and
b) a Network Operations Unit coupled to the IMU and configured to:
i. receive TDD configuration information; and
ii. in response to the received TDD configuration information, output TDD sync instructions to the IMU for instructing the at least one recipient to operate in synchronicity with the received TDD configuration.

### Claim 2 (depends on 1)

The communications system of claim 1, wherein the recipient of the instructions is at least one of a plurality of target base station/access points (BS/APs).

### Claim 3 (depends on 2)

The communications system of claim 2, wherein the instructions cause the at least one of the BS/APs to measure signals within a predetermined frequency range.

### Claim 4 (depends on 3)

The communication system of claim 3, the IMU further configured to:
a) receive a report indicating the RF environment;
b) determine from the received report whether there are any potential cross channel interference sources in the RF environment; and
c) output the TDD configuration only if there is a potential cross channel interference source.

### Claim 5 (depends on 1)

The communication system of claim 1, further including a server Medium Access Control sub-layer module (server MAC) coupled to the IMU, the server MAC configured to:
a) receive from the IMU the RF environmental survey request;
b) in response to receipt of the RF environmental survey request, generate RF environmental survey instructions;
c) transmit the RF environmental survey instructions to the at least one recipient;
d) receive in response to the transmission of the RF environmental survey instructions, measurements from the at least one recipient indicating the RF environment;
e) generate a report based on the measurements; and
f) provide the report to the IMU.

### Claim 6 (depends on 5)

The communication system of claim 5, the server MAC further configured to:
a) receive TDD sync instructions from the Network Operations Unit; and
b) in response to received sync instructions, transmit sync instructions to at least one recipient to cause the at least one recipient to operate in synchronicity with the received TDD configuration.

### Claim 7 (depends on 1)

The communication system of claim 1, wherein the recipient of the instructions is at least one of a plurality of user equipment (UEs) and wherein the instructions cause the at least one of the plurality of UEs to measure signals within a predetermined frequency range.

### Claim 8

A communications system comprising:
a) an interference mitigation unit (IMU) comprising a processor, memory and at least one input/output (I/O) port, the processor configured to:
i) output RF environment survey instructions from the at least one I/O port to cause a plurality of recipients to measure signals received within a predetermined frequency range;
ii) receive through the at least one I/O port, in response to the RF environment survey instructions, measurements indicating the RF environment;
iii) determine whether to use guard bands in transmissions;
iv) output information regarding the guard band if a determination is made to use the guard bands;
b) a Network Operations Unit comprising a processor and coupled to the IMU, the processor configured to:
i) receive the information regarding the guard band from the IMU; and
ii) in response to the received guard band information, output instructions to cause at least one of the recipients to transmit with the guard bands; and
c) further including a Medium Access Control sub-layer module (server MAC) configured to:
i) receive from the IMU the RF environmental survey instructions;
ii) transmit the RF environmental survey instructions to the plurality of recipients;
iii) receive measurements from the at least one of the plurality of recipients in response to the RF environmental survey instructions;
iv) prepare a report based on the receive measurements;
v) transmit the report to the IMU; and
vi) receive guard band instructions from the Network Operations Unit;
and wherein the IMU is further configured to receive the report prepared by the server MAC and determine whether to use guard bands in response to information provided in the report.

### Claim 9 (depends on 8)

The communication system of claim 8, wherein the plurality of recipients includes base station/access points (BS/APs).

### Claim 10 (depends on 9)

The communication system of claim 9, wherein the environment survey instructions output by the IMU cause the BS/APs to measure signals within a predetermined frequency range.

### Claim 11 (depends on 8)

The communication system of claim 8, wherein the plurality of recipients includes user equipment (UEs).

### Claim 12 (depends on 11)

The communication system of claim 11, wherein the environment survey instructions output by the IMU cause the UEs to measure signals within a predetermined frequency range.

### Claim 13

(canceled)

### Claim 14

A communications system comprising:
a) an interference mitigation unit (IMU) configured to:
i. output RF environment survey instructions to cause a plurality of recipients to measure signals received within a predetermined frequency range;
ii. receive, in response to the RF environment survey instructions, a report indicating the Radio Frequency (RF) environment associated with the target BS/APs;
iii. determine from the received report whether there are any potential sources of cross channel interference in the RF environment;
iv. determine sub-channel assignments for traffic flows based on the received report;
v. output sub-channel assignments;
b) a server Medium Access Control sub-layer module (server MAC) coupled to the IMU, the server MAC configured to:
i. receive from the IMU the RF environmental survey instructions;
ii. transmit the instructions to the plurality of target BS/APs;
iii. receive measurements from the target BS/APs;
iv. prepare a report based on the receive measurements;
v. transmit the report to the IMU;
vi. receive sub-channel assignments from the Network Operations Unit; and
c) a Network Operations Unit coupled to the IMU and configured to:
i. receive the sub-channel assignments from the IMU; and
ii. in response to the received sub-channel assignments, output instructions to the server MAC to cause at least one BS/AP to operate in accordance with the sub-channel assignments.

### Claim 15

A communications system comprising:
a) an interference mitigation unit (IMU) configured to:
i. output RF environment survey instructions to cause a plurality of target base station/access points (BS/APs) to measure signals received within a predetermined frequency range;
ii. receive, in response to the RF environment survey instructions, a report indicating the Radio Frequency (RF) environment associated with the target BS/APs;
iii. determine from the received report whether there are any potential sources of cross channel interference in the RF environment;
iv. determine whether to coax a user equipment (UE) from the current frequency assignment;
v. instructions to coax the UE from the current frequency assignment;
b) a server Medium Access Control sub-layer module (server MAC) coupled to the IMU, the server MAC configured to:
i. receive from the IMU the RF environmental survey instructions;
ii. transmit the instructions to the plurality of target BS/APs;
iii. receive measurements from the target BS/APs;
iv. prepare a report based on the receive measurements;
v. transmit the report to the IMU;
vi. receive transmit power instructions; and
c) a Network Operations Unit coupled to the IMU and configured to:
i. receive instructions to coax the UE from the current frequency assignment; and
in response to the received instructions to coax the UE from the current frequency assignment, output transit power instructions to the server MAC to cause at least one BS/AP to operate in accordance with the output power instructions.