Wi-Fi Peer Communication Using Safe RUs Under NR-U Interference
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Solution Overview
Problem
Interference from 5G new radio (NR-U) cellular technology affects peer-to-peer (P2P) communications in Wi-Fi networks, particularly when dual-capable stations experience interference that is undetectable by the Wi-Fi infrastructure, leading to communication failures and inefficient retries.
Innovation Solution
An access point evaluates interference severity based on station reports and allocates resource units (RUs) to transmission opportunities (TXOPs) that avoid detected interference, using a method to manage interference and optimize P2P communication by selecting safe RUs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If dual-capable STAs use both cellular and Wi-Fi radios simultaneously, then communication versatility is improved, but interference from cellular transmissions degrades Wi-Fi communication quality
Solution Approach 1:
The patent introduces an intermediary mechanism where the Wi-Fi access point acts as a mediator between interfering STAs. The AP receives interference reports from affected STAs, evaluates the severity of interference, and coordinates resource unit allocations to avoid simultaneous transmissions that cause interference. This intermediary approach allows dual-capable STAs to maintain both cellular and Wi-Fi connectivity while the AP manages interference between them.
2Device complexity
If the Wi-Fi infrastructure remains unaware of cellular interference, then system complexity is reduced, but communication reliability deteriorates due to undetectable interference
Solution Approach 1:
The patent implements a feedback mechanism where STAs monitor for cellular interference and report it to the Wi-Fi access point. The AP uses this feedback information to evaluate interference severity and adjust resource unit allocations accordingly. This feedback loop enables the Wi-Fi infrastructure to become aware of cellular interference without requiring complex changes to the overall system architecture, thereby maintaining reliability while limiting complexity increases.
3Productivity
If resource units are allocated without considering interference, then allocation speed is improved, but communication quality deteriorates due to interference-related failures
Solution Approach 1:
The patent applies preliminary action by having the access point evaluate interference severity and determine safe resource unit allocations before assigning them to STAs. The AP proactively identifies resource units that are likely to experience interference based on reported patterns and pre-determines alternative safe RUs. This preliminary assessment ensures that when resource allocation decisions are made, they already account for potential interference issues, maintaining both allocation efficiency and communication quality.
Data Source
AI summary
Disclosed are a system and method for avoiding interference in direct communication between peers in a Wi-Fi network. A station (STA) desiring to communicate directly with another STA reports a change in interference to a function that determines a set of unsafe frequencies caused by interference near the STA. The function sends a report containing the set of unsafe frequencies to the AP for the STA. The AP then evaluates the severity of the interference and selects a set of RUs that are suitable for a TXOP for direct communication between the STA and another STA. The AP informs the STAs of the selected set of RUs, and the STAs communicate with each other using the selected RUs. If allowed, the STA sends feedback regarding the success of the communication to the AP.