Coordinated D2D Communications via Reserved Access Windows
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Solution Overview
Problem
Existing wireless communication systems face challenges in achieving coexistence between wireless local area networks (WLAN) and peer-to-peer (P2P) or ad hoc networks, as regular infrastructure traffic often interferes with P2P traffic, and vice versa, leading to inefficiencies in resource allocation and communication.
Innovation Solution
The implementation of coordinated device-to-device (D2D) communications, where wireless access points and stations use periodic reserved access windows and shared time and frequency resources to enable D2D communications, allowing for scheduled access and reduced interference between WLAN and P2P networks.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If regular infrastructure traffic uses the wireless medium, then WLAN connectivity is maintained, but P2P traffic experiences interference
Solution Approach 1:
The wireless communication medium is segmented into different access modes: infrastructure mode for WLAN traffic and P2P mode for direct device communications. The system dynamically switches between these modes based on traffic type, allowing infrastructure traffic to maintain connectivity while enabling P2P traffic to operate independently without interference during P2P access windows.
Solution Approach 2:
The system implements periodic P2P access windows where P2P traffic is permitted to use the wireless medium during designated time intervals. During these windows, infrastructure access points suspend normal operations, creating periodic slots where P2P communications can occur without interference from regular WLAN traffic.
2Adaptability or versatility
If P2P traffic operates independently, then direct communication is enabled, but resource allocation becomes inefficient
Solution Approach 1:
The system incorporates feedback mechanisms where access points monitor traffic patterns and dynamically adjust resource allocation. When P2P traffic is detected, the access point sends control signals to participating stations, allocating specific time slots and frequency resources. This feedback loop enables efficient resource sharing between infrastructure and P2P traffic based on actual demand.
Solution Approach 2:
The resource allocation system is dynamic rather than static. The access points continuously adjust the duration and timing of P2P access windows based on real-time traffic conditions. When P2P traffic volume increases, the system extends P2P access windows; when traffic decreases, it reduces these windows to maximize infrastructure utilization, optimizing overall resource allocation efficiency.
3Reliability
If infrastructure traffic continues during P2P windows, then connectivity is maintained, but interference increases
Solution Approach 1:
The system extracts P2P traffic from the general infrastructure traffic flow by creating separate temporal and spatial channels. During P2P access windows, the wireless medium is dedicated exclusively to P2P communications, physically separating P2P traffic from infrastructure traffic to eliminate interference. This extraction allows both traffic types to coexist without mutual disruption.
Data Source
AI summary
Various aspects of the techniques, methods and devices described in this disclosure relate generally to achieving coexistence between WLAN and P2P networks, and specifically, to coordinated D2D communications. Some aspects particularly involve extending the capabilities of TWT elements transmitted by APs to support periodic reserved access windows during which D2D-enabled wireless devices are permitted to transmit direct wireless communications. Some other aspects relate to sharing time and frequency resources via CAP TDMA or CAP OFDMA techniques, and specifically, to allocating at least some of the time and frequency resources specifically for D2D communications. Some other aspects relate to periodic coordinated access windows during which APs are scheduled to contend but during which D2D devices are not permitted to contend, and specifically, to scheduling a reserved access window within a periodic coordinated access window during which D2D devices may transmit direct communications to other D2D devices despite the permissions associated with the periodic coordinated access windows.