Wi-Fi Direct Discovery via IP Hash Broadcasting
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Solution Overview
Problem
Current Wi-Fi Direct technologies lack a method for devices already associated with an access point to perform discovery efficiently, limiting their ability to establish connections and deliver services in infrastructure BSS mode.
Innovation Solution
A method involving a first device that receives a SeekService method, generates a service hash, and transmits a discovery request including the service hash to an access point, which is broadcasted to devices in the subnet, allowing for device and service discovery through an IP and UDP packet format, enabling seamless discovery and service establishment in infrastructure BSS mode.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If Wi-Fi Direct devices use legacy WLAN infrastructure mode with an access point, then stable connection and service delivery are achieved, but device discovery capability is lost or severely limited
Solution Approach 1:
The discovery process is segmented into two independent phases: infrastructure mode connection establishment (for reliability) and IP layer discovery (for versatility). The patent allows devices to maintain stable AP-based connections while simultaneously performing discovery through IP packet broadcasting, resolving the contradiction between connection stability and discovery capability.
Solution Approach 2:
The patent introduces IP layer packets as an intermediary mechanism that operates independently of the MAC layer infrastructure mode connection. This intermediary allows discovery functionality to coexist with stable AP-based communication, enabling devices to maintain reliable connections while achieving discovery through the IP layer.
2Speed
If Wi-Fi Direct devices perform discovery through MAC layer mechanisms, then discovery speed is fast, but the mechanism cannot work properly in infrastructure BSS mode with existing AP associations
Solution Approach 1:
The patent transitions from MAC layer discovery mechanisms to IP layer discovery mechanisms, adding a new dimensional level to the discovery process. This allows discovery to occur simultaneously at both MAC and IP layers, enabling infrastructure BSS mode compatibility while maintaining discovery functionality.
Solution Approach 2:
The patent changes the operational parameter from MAC layer frames to IP packets with UDP protocols. This parameter change enables the discovery mechanism to function in infrastructure BSS mode where devices are already associated with APs, as IP layer broadcasting operates independently of MAC layer restrictions.
3Adaptability or versatility
If a complex discovery procedure is implemented in Wi-Fi Direct, then comprehensive service discovery is achieved, but the establishment process becomes complicated and time-consuming
Solution Approach 1:
The patent performs preliminary service information exchange during the IP layer discovery phase before actual service establishment. By broadcasting service information via IP packets and receiving responses in advance, the system prepares necessary service parameters beforehand, simplifying the subsequent service establishment procedure while maintaining comprehensive discovery.
Solution Approach 2:
The patent uses a universal IP packet-based discovery mechanism that handles multiple discovery tasks simultaneously: service advertisement, service response, and connection preparation. This multi-functional approach reduces overall complexity by consolidating multiple discovery operations into a single unified process.
Data Source
AI summary
One embodiment of the present invention relates to a method for performing discovery from a first device supporting a Wi-Fi direct service, comprising the steps of: an application service platform (ASP) layer in the first device receiving, from a service layer, a SeekService method; the ASP layer generating a service hash based on the SeekService method; and transmitting a discovery request including the service hash to an access point (AP), wherein the discovery request is broadcasted to devices included in a subnet to which the first device belongs, via a port associated with the AP.