# US 10,122,494 B2 · Systems and methods for providing resilience to LTE signaling interference in WiFi

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- Number: US 10,122,494 B2
- Document ID: US10122494B2
- Status: Granted
- Kind: B2
- Application number: 15/413,655
- Filed: 2017-01-24
- Published: 2017-05-11
- Granted: 2018-11-06
- Earliest claimed: 2014-11-03
- Assignees: Cable Television Laboratories, Inc.
- Applicants: Cable Television Laboratories, Inc.
- Inventors: Alireza Babaei; Jennifer Andreoli-Fang; Yimin Pang
- Web page: https://patentgrep.com/patent/US10122494B2

## CPC

- H04L 1/007: {Unequal error protection (for format H04L1/0078; for codes per se H03M13/35)}
- H03M 13/353: {Adaptation to the channel}
- H04J 3/0647: {Synchronisation among TDM nodes}
- H04J 3/1694: {Allocation of channels in TDM/TDMA networks, e.g. distributed multiplexers (Passive Optical Networks H04Q11/0062)}
- H04L 1/0009: {by adapting the channel coding (H04L1/1812 takes precedence)}
- H04L 1/0011: {applied to payload information}
- H04L 1/0041: {Arrangements at the transmitter end}
- H04L 1/0045: {Arrangements at the receiver end}
- H04L 5/0092: {Indication of how the channel is divided}
- H04L 27/0006: {Assessment of spectral gaps suitable for allocating digitally modulated signals, e.g. for carrier allocation in cognitive radio (for spectrum sharing between different networks H04W16/14)}
- H04W 72/0446: Resources in time domain, e.g. slots or frames
- H04W 72/20: Control channels or signalling for resource management
- H04W 72/541: using the level of interference
- H04W 76/10: Connection setup
- H04W 84/12: WLAN [Wireless Local Area Networks]
- H04L: TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION (arrangements common to telegraphic and telephonic communication H04M)
- H03M: CODING; DECODING; CODE CONVERSION IN GENERAL (using fluidic means F15C4/00; optical analogue/digital converters G02F7/00; coding, decoding or code conversion, specially adapted for particular applications, see the relevant subclasses, e.g. G01D, G01R, G06F, G06T, G09G, G10L, G11B, G11C, H04B, H04L, H04M, H04N; ciphering or deciphering for cryptography or other purposes involving the need for secrecy G09C)
- 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)
- 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 presented herein enhance WiFi communications in a RF band where conflicting LTE signaling exists. In one embodiment, a system includes a processor operable to detect the WiFi communications between a UE and a wireless access point of a WiFi network, to identify errors in the WiFi communications, and to determine a periodicity of the errors based on the LTE signaling structure. The system also includes an encoder communicatively coupled to the processor and operable to encode the WiFi communications with error correction, and to change the error correction based on the periodicity of the errors in the WiFi communications.

## Claims

### Claim 1

A coexistence receiving system for processing a WiFi communication in a Radio Frequency (RF) band with conflicting Long Term Evolution (LTE) signaling, the system comprising:
a coexistence receiving processor having a periodicity detector configured to detect the WiFi communication between a user equipment (UE) and a wireless access point of a WiFi network, to identify errors in the WiFi communication, and to determine a periodicity of the errors based on an LTE signaling structure; and
a coexistence receiving decoder communicatively coupled to the coexistence receiving processor, wherein the coexistence receiving decoder decodes the WiFi communication according to the periodicity of the errors in the WiFi communications to determine if the errors are a result of conflicting LTE signaling in the same RF band as the WiFi communication.

### Claim 2 (depends on 1)

The system of claim 1, wherein:
the coexistence receiving decoder is further operable to change error correction according to the periodicity of the errors in the WiFi communication, and to decode the WiFi communication with the changing error correction.

### Claim 3 (depends on 2)

The system of claim 2, wherein the coexistence receiving decoder is further operable to change error correction by:
increasing an error correction rate of error correction coding when the errors occur; and
decreasing the error correction rate of the error correction coding when the errors subside.

### Claim 4 (depends on 2)

The system of claim 2, wherein the coexistence receiving decoder is further operable to change the error correction by:
predicting when the errors will occur in the WiFi communication;
determining that all bits during that time are in error; and
directing a receiver to logically flip the bits when received.

### Claim 5 (depends on 2)

The system of claim 2, wherein the coexistence receiving decoder is further operable to change the error correction by:
predicting when the errors will occur in the WiFi communication;
filling the WiFi communication with dummy bits at that time; and
directing a receiver to ignore the dummy bits when received.

### Claim 6 (depends on 1)

The system of claim 1, wherein:
the coexistence receiving processor is configured with the wireless access point to train with the UE to establish the WiFi communication with the UE.

### Claim 7 (depends on 1)

The system of claim 1, wherein:
the coexistence receiving processor is configured with the UE to train with the wireless access point to establish the WiFi communication with the wireless access point.

### Claim 8

A coexistence receiving method for providing WiFi communications in a Radio Frequency (RF) band with conflicting Long Term Evolution (LTE) signaling, the method comprising:
with a periodicity detector of a coexistence receiving processor:
detecting WiFi communication between a user equipment (UE) and a wireless access point of a WiFi network; and
identifying errors in the WiFi communication;
determining a periodicity of the errors based on an LTE signaling structure; and
with a coexistence receiving decoder, decoding the WiFi communications according to the periodicity of the errors in the WiFi communications to determine if the errors are a result of conflicting LTE signaling in the same RF band as the WiFi communication.

### Claim 9 (depends on 8)

The method of claim 8, further comprising, with the coexistence receiving decoder:
changing error correction according to the periodicity of the errors in the WiFi communication; and
decoding the WiFi communication with the changing error correction.

### Claim 10 (depends on 9)

The method of claim 9, wherein changing the error correction further comprises, with the coexistence receiving decoder:
increasing an error correction rate of error correction coding when the errors occur; and
decreasing the error correction rate of the error correction coding when the errors subside.

### Claim 11 (depends on 9)

The method of claim 9, wherein changing the error correction further comprises, with the coexistence receiving decoder:
predicting when the errors will occur in the WiFi communication;
determining that all bits during that time are in error; and
directing a receiver to logically flip the bits when received.

### Claim 12 (depends on 9)

The method of claim 9, wherein changing the error correction further comprises, with the coexistence receiving decoder:
predicting when the errors will occur in the WiFi communication;
filling the WiFi communication with dummy bits at that time; and
directing a receiver to ignore the dummy bits when received.

### Claim 13 (depends on 8)

The method of claim 8, further comprising, with the coexistence receiving processor:
training with the UE to establish the WiFi communication with the UE.

### Claim 14 (depends on 8)

The method of claim 8, further comprising, with the coexistence receiving processor:
training with the wireless access point to establish the WiFi communication with the wireless access point.

### Claim 15

A non-transitory computer readable medium comprising instructions that, when executed by a a coexistence receiving processor operating WiFi communication in a Radio Frequency (RF) band with conflicting Long Term Evolution (LTE) signaling, direct a periodicity detector of a coexistence receiving processor to:
detect WiFi communication between a user equipment (UE) and a wireless access point of a WiFi network;
identify errors in the WiFi communication; and
determine a periodicity of the errors based on an LTE signaling structure;
the computer readable medium further comprising that direct a coexistence receiving decoder to decode the WiFi communication according to the periodicity of the errors in the WiFi communications.

### Claim 16 (depends on 15)

The computer readable medium of claim 15, further comprising instructions that direct the coexistence receiving decoder to:
change error correction according to the periodicity of the errors in the WiFi communication; and
decode the WiFi communication with the changing error correction.

### Claim 17 (depends on 16)

The computer readable medium of claim 16, further comprising instructions that direct the coexistence receiving decoder to change the error correction by:
increasing an error correction rate of error correction coding when the errors occur; and
decreasing the error correction rate of the error correction coding when the errors subside.

### Claim 18 (depends on 16)

The computer readable medium of claim 16, further comprising instructions that direct the coexistence receiving decoder to change the error correction by:
predicting when the errors will occur in the WiFi communication;
determining that all bits during that time are in error; and
directing a receiver to logically flip the bits when received.

### Claim 19 (depends on 16)

The computer readable medium of claim 16, further comprising instructions that direct the coexistence receiving decoder to change the error correction by:
predicting when the errors will occur in the WiFi communication;
filling the WiFi communication with dummy bits at that time; and
directing a receiver to ignore the dummy bits when received.

### Claim 20 (depends on 15)

The computer readable medium of claim 15, further comprising instructions that direct the coexistence receiving processor to:
train with the UE to establish the WiFi communication with the UE.

### Claim 21 (depends on 15)

The computer readable medium of claim 15, further comprising instructions that direct the coexistence receiving processor to:
train with the wireless access point to establish the WiFi communication with the wireless access point.