V2X Message Exchange Server Handover Using Lookup-Based Topic Routing
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Solution Overview
Problem
Existing wireless communication systems face challenges in providing seamless V2X services as vehicles move between distributed server management areas, leading to increased power consumption and control message exchange.
Innovation Solution
A method and apparatus for operating a message exchange server and user equipment that allows for seamless handover between distributed servers by using a lookup server to determine adjacent message exchange servers based on topic lists and calculating topics based on the user equipment's location, utilizing MQTT Control Packets with Soft V2X specific commands for efficient handover.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If distributed message exchange servers are used for large-scale V2X services, then service capacity and coverage are improved, but handover complexity and control message exchange increase when vehicles move between server management areas
Solution Approach 1:
The service area is segmented into multiple management areas, each served by a dedicated message exchange server. This segmentation allows the system to handle large-scale V2X services by distributing the load across multiple servers while maintaining manageable handover procedures within defined area boundaries.
Solution Approach 2:
A lookup server is introduced as an intermediary to manage server information and facilitate handover decisions. The lookup server stores and provides server location information, enabling message exchange servers to efficiently determine adjacent servers without complex direct communication protocols, thereby reducing handover control complexity.
2Reliability
If frequent handover messages are exchanged during server area transitions, then service continuity is maintained, but power consumption increases
Solution Approach 1:
The lookup server pre-stores server information including locations and management area boundaries. This preliminary preparation allows message exchange servers to make rapid handover decisions based on pre-calculated adjacent server relationships, reducing the frequency and volume of handover messages that UEs must process, thereby lowering power consumption while maintaining service continuity.
Solution Approach 2:
The system enables message exchange servers to autonomously determine adjacent servers using the lookup server's stored information. This self-service mechanism reduces reliance on frequent inter-server communication and handover message exchanges, allowing UEs to transition between areas with minimal power-consuming signaling.
3Measurement precision
If message exchange servers store complete topic lists for all management areas, then topic lookup accuracy is improved, but memory requirements and information management complexity increase
Solution Approach 1:
The lookup server consolidates server information and management area data from all message exchange servers into a centralized repository. This merging eliminates the need for each server to store complete topic lists for all areas, as the lookup server provides accurate server location information based on unified management area definitions, maintaining lookup accuracy while reducing redundant information storage.
Solution Approach 2:
The lookup server serves multiple functions: storing server information, defining management area boundaries, and providing adjacent server relationships. This universal resource eliminates the need for each message exchange server to maintain separate comprehensive topic lists, reducing overall information volume while preserving accurate topic lookup capability through centralized management.
Data Source
AI summary
A method of operating a message exchange server related to vehicle-to-everything (V2X) message transmission and reception in a wireless communication system can include obtaining, by the message exchange server, information of an adjacent message exchange server from a lookup server; and receiving, by the message exchange server, a message published by a User Equipment (UE). Also, in response to determining, by the message exchange server, that a topic included in the message published by the UE is not included in a topic list of the message exchange server, the method can further include transmitting, by the message exchange server, a handover message to the UE.