Wi-Fi Direct Persistent Discovery for Faster Reconnection
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Solution Overview
Problem
Wi-Fi Direct (WFD) connections experience latency due to the need for repeated device and service discovery processes when re-establishing connections, leading to inefficiencies in data sharing between devices.
Innovation Solution
A method and system that transmit a probe request frame with persistence capability and information, allowing for persistent storage of discovery information and automatic reconnection using this stored data, along with a mechanism for notifying changes in discovery information to optimize connection establishment and maintenance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If device discovery and service discovery are performed repeatedly to re-establish WFD connections, then connection reliability is improved, but connection establishment time increases
Solution Approach 1:
The patent applies preliminary action by storing discovery information (device capabilities, service information, connection parameters) in a persistent manner during the initial discovery phase. When re-establishing a WFD connection, the system retrieves this pre-stored information instead of performing complete device and service discovery again, thereby reducing connection establishment time while maintaining connection reliability through verified stored data
2Measurement precision
If complete device and service discovery processes are performed each time, then discovery information accuracy is improved, but processing complexity increases
Solution Approach 1:
The patent segments the discovery process into two parts: initial complete discovery (for accuracy) and subsequent simplified re-discovery (for efficiency). The system divides discovery information into essential elements (device ID, capabilities, service types) that can be stored and reused, separating them from dynamic elements that require fresh discovery. This segmentation reduces processing complexity for reconnections while maintaining accuracy for static information
Solution Approach 2:
The patent uses copying by creating and storing copies of discovery information obtained during initial device and service discovery. These copied information elements (device description, service description, connection parameters) are saved in persistent storage and reused during reconnection attempts, reducing the need to perform complete discovery processes again while maintaining information accuracy
Data Source
AI summary
A method and system for establishing a Wireless Fidelity (Wi-Fi) Direct (WFD) connection between Wi-Fi devices are provided. The method includes transmitting, by a source Wi-Fi device, a probe request frame indicating a first set of parameters through a pre-defined channel, wherein the first set of parameters comprises a persistence capability and persistence information; receiving a probe response frame indicating a second set of parameters from a destination Wi-Fi device, wherein the second set of parameters comprises discovery information associated with the destination Wi-Fi device; persistently storing the discovery information associated with the destination Wi-Fi device at the source Wi-Fi device; and establishing a WFD connection with the destination Wi-Fi device using the persistently stored discovery information.