Wi-Fi P2P Interference Management via AP Polling
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Solution Overview
Problem
In Wi-Fi 7, peer-to-peer (P2P) communication faces challenges with time synchronization and transmit power management, particularly in multi-user orthogonal frequency-division multiple access (MU OFDMA) transmissions, where ensuring high receive power for P2P devices amidst interference from other transmitting devices is difficult.
Innovation Solution
An access point (AP) polls P2P stations for interference data, assigns resource units (RUs) based on this data to manage interference, and transmits trigger frames that adjust data rates and synchronize clocks for successful P2P communication, allowing multiple P2P pairs to communicate in parallel with non-P2P stations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If multiple devices transmit simultaneously in MU OFDMA, then wireless resource utilization improves, but receive power at P2P devices decreases due to interference
Solution Approach 1:
The patent applies local quality by assigning different transmit power levels to different stations based on their specific interference impact on P2P receivers. The AP determines which stations cause harmful interference to P2P communication and adjusts their transmit power locally rather than uniformly across all stations, thereby maintaining high resource utilization while protecting P2P receive quality.
Solution Approach 2:
The patent changes the transmit power parameter dynamically based on interference conditions. The AP receives interference information from P2P stations, identifies interfering stations, and adjusts their transmit power levels accordingly. This parameter adjustment allows simultaneous transmission by multiple devices while ensuring P2P devices receive sufficient signal quality.
2Reliability
If transmit power is increased to overcome interference, then receive power improves, but energy consumption increases
Solution Approach 1:
The patent implements feedback by having P2P stations report interference information to the AP, which then identifies interfering stations and adjusts their transmit power. This feedback loop enables the system to achieve reliable P2P communication through targeted power adjustment rather than blanket power increases, thereby reducing overall energy consumption while maintaining receive power quality.
Solution Approach 2:
The AP acts as an intermediary that coordinates transmit power levels among stations. Instead of P2P transmitters directly increasing power to overcome interference, the AP mediates by adjusting interfering stations' power levels based on feedback, achieving the same reliability improvement with lower energy consumption.
3Productivity
If data rate is increased for P2P communication, then communication efficiency improves, but interference tolerance decreases
Solution Approach 1:
The patent applies preliminary action by having the AP proactively identify interfering stations and adjust their transmit power before P2P communication occurs. By pre-adjusting the interference environment, the system can then use higher data rates for P2P communication without suffering from interference, thereby achieving both high efficiency and interference tolerance.
Data Source
AI summary
Embodiments herein describe assigning RUs to P2P stations to perform P2P communication. An AP can assign trigger frames to assign RUs to STAs to use when transmitting data to the AP. In one embodiment, the AP polls the P2P STAs associated with it to receive interference data. This data can indicate the affect other peer STAs have on the P2P STAs when transmitting data. Using the interference data, the AP can determine whether another P2P pair or a non-P2P station can be assigned RUs to transmit at the same time, and at what data rates.