Local Header V2X Sidelink Resource Coordination
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Solution Overview
Problem
In vehicle-to-everything (V2X) communication systems, the lack of centralized control over sidelink resource usage and transmission timings leads to transmission collisions and half-duplex limitations, degrading reliability and causing missed receptions between group member UEs, especially at high transmission rates.
Innovation Solution
A local header apparatus pre-allocates sidelink resources in a time domain multiplexed manner and coordinates transmission timings between group member UEs in unicast or groupcast sessions, using fair-proportional allocation and modulo equations to ensure synchronized and separated transmissions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If unicast and groupcast transmissions are supported without centralized control, then transmission flexibility and device autonomy are improved, but transmission collisions and reliability degrade
Solution Approach 1:
A local header UE is introduced as an intermediary entity to coordinate SL resource usage among group member UEs. The local header pre-allocates transmission opportunities and coordinates transmission timings, acting as a mediator that enables flexible unicast/groupcast transmissions while preventing collisions through centralized resource management within the group.
Solution Approach 2:
The system divides the unicast/groupcast session into multiple time-domain transmission opportunities that are pre-allocated to different group member UEs. By segmenting the resource usage in time domain and assigning specific transmission slots to each UE, the system maintains transmission flexibility while avoiding collisions through structured resource division.
2Productivity
If transmission rate is increased to improve productivity, then data transfer efficiency is improved, but half-duplex limitation causes more severe missed receptions
Solution Approach 1:
The local header performs preliminary action by pre-allocating transmission opportunities and coordinating transmission timings before actual data transmissions occur. This advance coordination ensures that even at high transmission rates, UEs transmit in synchronized time slots that avoid half-duplex conflicts, maintaining both high productivity and reception reliability.
3Reliability
If centralized SL resource coordination is introduced to improve reliability, then transmission collision reduction is achieved, but system complexity increases
Solution Approach 1:
The local header UE serves as a distributed intermediary that provides centralized coordination functionality without requiring a separate central controller. This approach improves reliability through coordinated resource management while limiting complexity growth by utilizing existing UE capabilities and avoiding the need for additional dedicated coordination infrastructure.
Data Source
AI summary
An apparatus and a method of vehicle-to-everything (V2X) communication of same are provided. The apparatus is a local header. The method includes pre-allocating a plurality of transmission opportunities of a plurality of sidelink (SL) resources in a time domain multiplexed (TDM'ed) manner, and coordinating transmission timings between a plurality of group member user equipments (UEs) in a unicast session or a groupcast session.