UE Multicast Base Station Selection via Channel Quality
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Solution Overview
Problem
In V2X communication, existing technologies face challenges in quickly and efficiently determining a downlink multicast/broadcast area, leading to increased signaling overhead and latency due to the need for dynamic position updates of vehicular UEs, especially when position information is unavailable.
Innovation Solution
An electronic device at the user equipment end measures downlink channel qualities and predicts geographical positions to determine a set of base stations for broadcasting or caching data information, reducing signaling overhead and latency by using channel quality measurement results and geographical position prediction.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the base station dynamically updates position information of all VUEs to determine multicast/broadcast area, then the multicast/broadcast area can be accurately determined, but the signaling overhead increases
Solution Approach 1:
The user equipment autonomously determines the multicast/broadcast area by measuring downlink channel qualities of surrounding base stations and selecting base stations that meet preset thresholds, eliminating the need for base station coordination and position information updates. This self-service approach resolves the contradiction by achieving accurate area determination without increasing signaling overhead.
Solution Approach 2:
Instead of having the base station determine the multicast/broadcast area based on VUE position information (traditional approach), the invention inverts the determination process by having user equipment autonomously select base stations based on downlink channel quality measurements. This inversion eliminates the signaling overhead while maintaining determination accuracy.
2Measurement precision
If the base station waits for position information to determine multicast/broadcast area, then position accuracy is ensured, but the latency increases
Solution Approach 1:
User equipment continuously measures and monitors downlink channel qualities of surrounding base stations in advance, maintaining an updated list of available base stations and their channel qualities. When V2X data needs to be transmitted, the multicast/broadcast area can be immediately determined using pre-collected channel quality information, eliminating waiting time while ensuring accurate base station selection.
3Measurement precision
If position information is used to determine multicast/broadcast area, then the area can be accurately identified, but the solution becomes inapplicable when position information is unavailable
Solution Approach 1:
The invention changes the determination parameter from position information to downlink channel quality measurements. By using channel quality metrics (such as RSRP, RSRQ) as the basis for selecting base stations and defining the multicast/broadcast area, the solution becomes applicable in all scenarios including those where position information is unavailable, while maintaining area identification accuracy through quality-based selection.
Data Source
AI summary
Disclosed are a wireless-communication electronic device and method. The electronic device of a user equipment terminal comprises a processing circuit, said processing circuit being configured to: measure the downlink channel quality of a serving base station and adjacent base station of a user equipment; on the basis of the measured downlink channel quality, determine a first base station set from the serving base station and adjacent base station, the first base station set representing a base station set that is to broadcast or multicast data and information. According to the embodiments of the present disclosure, even if location information is unusable, it is still possible to quickly determine a multicast/broadcast base station, while signaling overhead is also reduced.