Wi-Fi Display Session Initiation via Pre-established Layer 2 Link
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Solution Overview
Problem
Current Wi-Fi Direct technologies face challenges in establishing efficient session initiation between devices, particularly due to the need for reestablishing layer 2 connections even when an IP connection is already established, leading to inefficient procedures.
Innovation Solution
A method involving a first device transmitting a frame related to Wi-Fi Display (WFD) discovery and an RTSP M1 message, where if an IP connection is established, a provision discovery request or session initiation request can be sent before the M1 message, allowing for session initiation without reestablishing a layer 2 connection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If Wi-Fi Direct devices reestablish layer 2 connection for session initiation, then connection reliability is improved, but procedure complexity and time consumption increase
Solution Approach 1:
The patent applies preliminary action by establishing the layer 2 connection in advance during the device discovery phase. When devices perform WFD discovery, they simultaneously establish a layer 2 connection that can be reused for subsequent session initiation. This eliminates the need to reestablish the connection during session initiation, reducing procedure complexity while maintaining reliability.
2Reliability
If Wi-Fi Direct devices reestablish layer 2 connection for session initiation, then connection stability is improved, but time consumption increases
Solution Approach 1:
The layer 2 connection is established in advance during device discovery, allowing session initiation to proceed without reestablishment delays. This preliminary establishment reduces the time required for session initiation while maintaining connection stability through the pre-established reliable link.
Solution Approach 2:
The patent maintains the layer 2 connection continuously from device discovery through session initiation, avoiding interruption and reestablishment. This continuous connection reduces time consumption by eliminating the gap required for connection teardown and reestablishment, while preserving connection stability throughout the process.
3Productivity
If IP connection is leveraged without reestablishing layer 2 connection, then procedure efficiency is improved, but connection reliability may deteriorate
Solution Approach 1:
The layer 2 connection is established in advance during device discovery and maintained throughout session initiation. This allows the system to leverage the existing IP connection for efficient session initiation while preserving the reliable layer 2 connection, thus achieving both procedure efficiency and connection reliability simultaneously.
Data Source
AI summary
An embodiment of the present invention relates to a Wi-Fi display (WFD) service initiation method comprising the steps of: in a method for a first apparatus that supports WFD initiating a WFD service, the first apparatus transmitting a WFD discovery frame to a second apparatus; and the first apparatus transmitting a real-time streaming protocol (RTSP) M1 message, wherein the first apparatus transmits one of a provision discovery request or a session initiation request to the second apparatus before transmitting the M1 message if there is an internet protocol (IP) connection established between the first apparatus and the second apparatus when transmitting the WFD discovery frame.