Wi-Fi Direct Probe Frame Peripheral Function Discovery
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Solution Overview
Problem
In Wi-Fi Direct systems, devices lack a method to remotely discover and utilize peripheral functions provided by other devices without performing a service discovery procedure, limiting the ability to access and control peripheral functions during device discovery.
Innovation Solution
A method involving the transmission and reception of probe request and response frames that include information about peripheral functions, allowing a wireless dockee to identify supported peripheral functions by a wireless docking center during device discovery, without requiring a separate service discovery process.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of information
If a separate service discovery procedure is implemented to discover peripheral functions, then the completeness of peripheral function information is improved, but the complexity of the device discovery process increases
Solution Approach 1:
The patent merges the service discovery procedure with the device discovery procedure by including peripheral function information in the probe response frame during device discovery. This integration eliminates the need for a separate service discovery process, reducing overall system complexity while ensuring complete peripheral function information is obtained.
Solution Approach 2:
The patent applies preliminary action by including peripheral function information in advance within the probe response frame during the initial device discovery phase. This allows the wireless dockee to obtain peripheral function information before establishing a connection, eliminating the need for subsequent service discovery procedures.
2Measurement precision
If a separate service discovery procedure is implemented, then the accuracy of peripheral function identification is improved, but the time required for device connection increases
Solution Approach 1:
The patent combines device discovery and service discovery into a single integrated process. The probe response frame includes both device identification information and peripheral function information, allowing simultaneous discovery of both aspects without requiring sequential procedures, thus reducing connection time while maintaining identification accuracy.
Solution Approach 2:
The patent performs service discovery in advance during the device discovery phase. By including peripheral function information in the probe response frame, the system identifies peripheral functions before connection establishment, eliminating the need for additional time-consuming service discovery steps after connection.
3Productivity
If peripheral function information is included in probe response frames, then the efficiency of peripheral function access is improved, but the size of communication frames increases
Solution Approach 1:
The patent merges multiple information types (device identification and peripheral function information) into a single probe response frame. This consolidation improves access efficiency by providing all necessary information in one transmission, while the frame size increase is managed through structured encoding of the information.
Solution Approach 2:
The probe response frame is designed to serve multiple functions simultaneously: device identification, peripheral function advertisement, and capability information exchange. This multi-functionality improves overall system efficiency by eliminating the need for separate information exchange messages.
Data Source
AI summary
Disclosed are a method and an apparatus capable of searching for a docking service and a peripheral function incidental to the docking service in a direct communication system. To this end, a method by which a first wireless device searches for a peripheral function provided by a second wireless device can comprise the steps of: transmitting a probe request frame to the second wireless device by the first wireless device; and receiving a probe response frame from the second wireless device as a response to the search request, wherein the probe response frame can include a bitmap for indicating a name of the peripheral function supported by the second wireless device or the peripheral function supported by the second wireless device.