V2X UE Carrier Frequency Selection for Multi-Mode Service
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Solution Overview
Problem
Current V2X communication systems face challenges in simultaneously performing operations according to both 'Served by E-UTRAN' and 'Not Served by E-UTRAN' modes, and in transmitting V2X messages on multiple carrier frequencies, leading to limitations in simultaneous V2X service performance.
Innovation Solution
A method for selecting carrier frequencies for V2X communication through PC5, where the UE prioritizes 'Served by E-UTRAN' modes when possible, and performs cell reselection or PLMN reselection to avoid interference, allowing simultaneous transmission on multiple frequencies by selecting suitable carrier frequencies for ongoing and new V2X services.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the UE performs operations in both 'Served by E-UTRAN' and 'Not Served by E-UTRAN' modes simultaneously, then V2X service coverage is improved, but system complexity and interference management difficulty increase
Solution Approach 1:
The UE dynamically switches between 'Served by E-UTRAN' and 'Not Served by E-UTRAN' modes based on real-time conditions such as carrier frequency availability, PLMN registration status, and network coverage. This dynamic adaptation allows the system to handle multiple V2X services with different operational requirements without requiring simultaneous complex multi-mode operation, thereby improving service coverage while managing system complexity.
Solution Approach 2:
The V2X communication operations are segmented into distinct modes ('Served by E-UTRAN' and 'Not Served by E-UTRAN') with clear transition conditions. Each mode has its own specific procedures for carrier frequency selection, PLMN registration, and message transmission. This segmentation allows the system to manage complexity by handling one mode at a time while maintaining the ability to support both service types through sequential operation.
2Productivity
If the UE transmits V2X messages on multiple carrier frequencies, then V2X service performance is improved, but resource management complexity and interference risk increase
Solution Approach 1:
The UE applies different transmission characteristics and resource management strategies to each carrier frequency based on local conditions such as service type, network coverage, and interference levels. For example, different modulation and coding schemes, power levels, or message priorities may be applied to different carrier frequencies. This localized optimization improves overall V2X service performance while keeping resource management tractable by treating each frequency independently rather than managing all frequencies uniformly.
3Reliability
If the UE performs cell reselection or PLMN reselection to avoid interference, then communication reliability is improved, but transmission time and service continuity may be affected
Solution Approach 1:
The UE performs cell reselection or PLMN reselection in advance before interference becomes critical, based on predicted conditions such as moving towards cell boundaries, changing service requirements, or anticipated network conditions. By proactively selecting appropriate carrier frequencies and PLMNs before interference occurs, the system maintains communication reliability while minimizing the time lost during reselection operations, as the actual transmission can begin immediately after the preliminary selection is complete.
Data Source
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AI summary
Disclosed are a method for performing V2X communication in a wireless communication system and an apparatus for the same. Specifically, a method for performing vehicle-to-everything (V2X) communication by a user equipment (UE) in a wireless communication system includes: receiving a transmission request of a V2X message of a V2X service identified by a V2X service identifier from an upper layer by using V2X communication through a PC5 interface, the transmission request including the V2X message and the V2X service identifier; requesting or selecting a resource for the V2X communication through the PC5 interface to a base station based on whether the UE is serviced by an evolved universal terrestrial radio access network (E-UTRAN) for the V2X communication; and transmitting the V2X message through the PC5 interface by transferring the V2X me3ssage to a lower layer, and when mapping between the V2X service identifier and a transmission parameter is configured, the transmission parameter associated with the V2X service identifier may be transferred to the lower layer together with the V2X message.