Wi-Fi P2P Device Discovery with Legacy Probe Response
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Solution Overview
Problem
Legacy Wi-Fi devices cannot discover Wi-Fi P2P devices during the device discovery process due to the P2P device's inability to respond to probe requests before becoming a group owner, leading to connection delays.
Innovation Solution
A modified P2P device discovery method where the Wi-Fi P2P device configures itself as an autonomous group owner, enters a group owner receive mode to receive probe requests, and responds accordingly to enable connection with both Wi-Fi P2P and legacy devices without requiring a Group Owner negotiation process.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the Wi-Fi P2P device waits to become group owner before responding to probe requests, then the device follows standard P2P protocol procedures, but legacy devices cannot discover the P2P device during scanning, causing connection delays
Solution Approach 1:
The Wi-Fi P2P device performs preliminary actions by proactively announcing its presence through probe responses before completing the Group Owner negotiation process. When the device receives a probe request from a legacy device, it temporarily responds with probe response frames containing P2P information elements, allowing the legacy device to discover it during scanning. This preliminary announcement of presence resolves the contradiction by enabling discovery before formal P2P group establishment.
2Adaptability or versatility
If the Wi-Fi P2P device responds to probe requests before becoming group owner, then legacy devices can discover and connect to the P2P device, but the device deviates from standard P2P protocol where Group Owner negotiation should occur first
Solution Approach 1:
The device implements dynamic behavior by adjusting its response strategy based on the type of incoming probe request. It maintains standard P2P protocol compliance for P2P device discoveries while dynamically switching to a legacy-compatible mode when receiving probe requests from legacy devices. This dynamic adaptation allows the device to handle different device types differently, achieving broad compatibility without permanently deviating from the protocol.
Solution Approach 2:
The device changes operational parameters by modifying its probe response behavior conditionally. It alters the state of probe response transmission based on device type detection, enabling or disabling responses to specific probe requests. This parameter change allows selective compatibility with legacy devices while maintaining standard P2P operations, resolving the contradiction between protocol adherence and legacy support.
3Reliability
If the Wi-Fi P2P device performs Group Owner negotiation before device discovery, then the connection follows standard P2P sequence, but legacy devices that cannot transmit probe responses experience extended connection establishment time
Solution Approach 1:
The probe response frame acts as an intermediary mechanism that bridges the gap between P2P protocol requirements and legacy device capabilities. By inserting this intermediate response step, the device enables legacy devices to discover and initiate connections without requiring them to perform probe requests, thus maintaining connection sequence integrity while accelerating establishment speed for legacy devices.
Data Source
AI summary
A device discovery method and apparatus of a Wi-Fi Peer-to-Peer (P2P) device for improving connection compatibility with legacy devices are provided. The method includes receiving a command for executing a modified P2P device discovery mode, configuring the Wi-Fi P2P device as a group owner autonomously, entering a group owner receive mode in which a probe request can be received, and discovering an external device which transmits the probe request.