WLAN Discovery via PC5 ProSe Messages
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Solution Overview
Problem
Current 3GPP ProSe technologies face challenges in WLAN discovery, session continuity, radio access selection, interworking between different radio access technologies, and power consumption during direct discovery and communication, particularly in out-of-coverage or low-signal scenarios, leading to session discontinuity and inefficient resource utilization.
Innovation Solution
Incorporating WLAN discovery frames into PC5 discovery messages, enabling UE-assisted radio access selection, and establishing communication using Neighbor Awareness Networking (NAN) service discovery information, which includes hashed service identification and interface addresses, to facilitate seamless communication between UEs over WLAN or LTE ProSe, and allowing UEs to autonomously switch between radio access technologies based on signal conditions and network instructions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If WLAN direct discovery is performed separately before PC5 communication, then WLAN discovery can be established, but it increases power consumption and delays communication setup
Solution Approach 1:
The patent combines WLAN discovery frame transmission with PC5 discovery message transmission into a single unified process. The UE transmits both PC5 discovery information and WLAN direct discovery information simultaneously through the same message structure, eliminating the need for separate discovery procedures and reducing overall power consumption while maintaining reliable discovery across both radio access technologies.
Solution Approach 2:
The patent embeds WLAN direct discovery information in advance within the PC5 discovery message, so that when a UE receives a PC5 discovery message, it already has the necessary WLAN discovery information to establish WLAN communication without needing to perform separate preliminary WLAN discovery procedures.
2Adaptability or versatility
If UEs perform separate WLAN and PC5 discovery procedures, then comprehensive discovery is achieved, but it increases discovery time and delays communication establishment
Solution Approach 1:
The patent merges WLAN discovery and PC5 discovery into a single integrated discovery message structure. The PC5 discovery message includes both PC5 direct communication information and WLAN direct discovery information (such as NAN service discovery frames), allowing UEs to perform both types of discovery simultaneously through one procedure rather than sequentially.
Solution Approach 2:
The discovery message structure is designed to serve multiple functions: it enables both PC5 direct communication discovery and WLAN direct communication discovery within a single message framework, making the discovery mechanism universal and applicable to multiple radio access technologies without requiring separate specialized procedures.
3Productivity
If UEs are redirected to WLAN technology for direct discovery or communication, then network congestion is relieved, but it requires additional WLAN discovery procedures
Solution Approach 1:
The patent prepares WLAN discovery information in advance by embedding it within the PC5 discovery message that is already being transmitted. When the network wants to redirect UEs to WLAN to relieve congestion, the UEs already have the necessary WLAN discovery information readily available, eliminating the need for additional WLAN discovery procedures and reducing the complexity of the redirection process.
4Device complexity
If fallback mechanism between D2D technologies is not defined, then system simplicity is maintained, but session continuity is lost when UEs move out of communication range
Solution Approach 1:
The patent combines discovery information for multiple D2D technologies (PC5 and WLAN) into a single integrated message structure. This allows UEs to have knowledge of both communication paths available, enabling seamless fallback between technologies when moving out of range without requiring complex separate management systems, thus maintaining both simplicity and session continuity.
Data Source
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AI summary
The various embodiments of the present invention disclose a method of transmitting a Wireless Local Area Network (WLAN) discovery frame over a PC5 link. According to one embodiment, the method includes registering, by one or more User Equipment's (UE), with a Prose Server by sending a capability information for receiving direct discovery or communication parameters, policies, authorization, provisioning and radio resources by the prose server, the one or more UE's to include a WLAN discovery frame in a PC5 message, transmitting, by a first User Equipment, a PC5 discovery message to a second User Equipment, indicating by the second UE, a message to a neighbor awareness networking (NAN) discovery engine indicating the reception of PC5 Discovery message along with the WLAN discovery frame, and establishing by the second UE, a WLAN communication link with the first UE, without performing a WLAN discovery search.