Radio Frequency Interference Coordination for P2P and WLAN
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Solution Overview
Problem
Wireless communication systems, particularly point-to-point (P2P) devices, face interference from unknown or difficult-to-identify sources like WLAN access points, especially with the introduction of WiFi6E devices operating in the 6 GHz band, due to differences in duplexing and channel access mechanisms, leading to increased interference opportunities.
Innovation Solution
Implementing a central coordinator (AFC) system for registration and regulation of APs and P2P devices, using a signal processing unit (SPU) to identify interfering APs, and adjusting transmission characteristics to mitigate interference by correlating signal interference times with transmission times.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If P2P devices operate in unlicensed bands with WLAN devices, then spectrum utilization is improved, but interference between P2P and WLAN devices increases
Solution Approach 1:
An Automated Frequency Coordination (AFC) system is introduced as an intermediary between P2P devices and WLAN devices. The AFC system receives interference reports from P2P devices, identifies offending WLAN access points, and coordinates frequency usage to reduce interference while allowing both systems to operate in the unlicensed band
Solution Approach 2:
The system implements a feedback mechanism where P2P devices monitor for interference, report it to the AFC system with identifying information about the interfering source, and the AFC system responds by adjusting frequency coordination. This closed-loop feedback enables dynamic interference management
2Productivity
If P2P devices use directional antennas for focused communication, then transmission efficiency is improved, but ability to identify interference sources worsens
Solution Approach 1:
The antenna system is segmented into multiple independent antenna elements that can be independently controlled. By activating different antenna elements or adjusting their beamforming weights, the system can perform spatial scanning to identify interference sources while maintaining efficient directional communication when needed
Solution Approach 2:
The antenna system dynamically adjusts its beamforming characteristics based on operational needs. During normal communication, directional beams provide focused transmission. When interference identification is needed, the system dynamically reconfigures antenna patterns to scan for and locate interfering sources
3Reliability
If central coordinator system is implemented to regulate transmissions, then interference management is improved, but system complexity increases
Solution Approach 1:
P2P devices autonomously monitor for interference and generate reports containing identifying information about interfering sources. The WLAN access points self-identify through their normal transmissions. This self-service approach reduces the burden on the central AFC system while maintaining reliable interference management
Data Source
AI summary
Provided are techniques that include receiving, from a wireless device, a registration request; sending, to the device, a first set of device transmission characteristics; receiving, from a terminal system, an interference report identifying an interfering wireless device, where the terminal system includes: an antenna system including: a first and second antenna systems adapted to receive wireless signals; and a signal processing unit (SPU) adapted to: receive a first wireless signal received by the first antenna; receive a second wireless signal received by the second antenna; determine, based on the first and second wireless signals, an identity of the interfering wireless device and generate the interference report; determining that the interfering device corresponds to the wireless device; determining a second set of device transmission characteristics to reduce interference of the first wireless signal; and sending, to the wireless device, the second set of device transmission characteristics.