V2X Message Transmission Interface Selection in Local Networks
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Solution Overview
Problem
Ensuring service continuity in V2X message transmission and reception via an LTE Uu interface in a local network is challenging due to changes in the local network environment, such as movement of user equipment (UE) between different local networks, which can disrupt PDN connections and cause service connectivity issues.
Innovation Solution
A method and apparatus for a UE to transmit and receive V2X messages by determining whether to use the LTE Uu interface or the PC5 interface based on local network boundary-related information, allowing for seamless communication by reconfiguring PDN connections during Selected IP Traffic Offload at Local Network (SIPTO) periods and omitting the one-to-one link setup procedure with RSUs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If V2X message transmission is performed via LTE Uu interface in a local network, then network coverage and infrastructure utilization are improved, but service continuity is disrupted when UE moves between different local networks
Solution Approach 1:
The patent implements dynamic interface selection between LTE Uu and PC5 interfaces based on UE location and network conditions. The UE determines whether to use LTE Uu interface (when in local network coverage) or PC5 interface (when moving between local networks) to maintain continuous V2X communication service, thus adapting to changing network environments while ensuring service reliability
Solution Approach 2:
The patent introduces PC5 interface as an intermediary communication path when LTE Uu interface becomes unavailable due to local network boundary transitions. This alternative interface acts as a mediator to maintain V2X message transmission continuity during handover between local networks, preventing service disruption
2Reliability
If PDN connection is maintained during local network handover, then service connectivity is preserved, but connection reconfiguration overhead increases
Solution Approach 1:
The patent performs preliminary actions by establishing PC5 interface connection before LTE Uu interface connection is fully released during local network handover. This preliminary setup ensures that V2X communication can continue seamlessly without waiting for PDN connection reconfiguration to complete, thereby reducing connection reconfiguration overhead and time loss
3Reliability
If one-to-one link setup procedure with RSU is performed, then communication reliability is improved, but procedure complexity and setup time increase
Solution Approach 1:
The patent makes the UE capable of performing both UE-to-UE communication and UE-to-RSU communication through the same PC5 interface. This multi-functionality eliminates the need for separate one-to-one link setup procedures with RSUs, as the UE can directly communicate with RSUs using the same mechanism, thereby reducing procedure complexity while maintaining communication reliability
Data Source
AI summary
One embodiment of the present invention provides a method for transmitting/receiving a vehicle-to-everything (V2X) message by a user equipment (UE) in a wireless communication system, the method comprising the steps of: transmitting/receiving a V2X message through a long-time evolution (LTE) Uu interface of a first local network; receiving local network boundary-related information from a first base station of the first local network; and determining execution of one or more of transmission and reception of a V2X message through a PC5 interface during a SIPTO period, on the basis of the local network boundary-related information.