Relay UE Prioritizing Group Communications in MBMS Mode
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Solution Overview
Problem
Current mobile communication systems face challenges in enabling efficient proximity communication between user equipment (UEs) without the involvement of a base station, particularly in scenarios where UEs need to relay group communications, especially when downlink media is transmitted in multimedia broadcast/multicast service (MBMS) mode, and it is impossible to receive all media due to frequency and priority considerations.
Innovation Solution
A method where a UE capable of operating as a relay checks if it can receive downlink media in MBMS mode, determines the specific group communication to prioritize based on priorities and the number of relayed UEs, and switches to unicast mode when necessary to ensure reliable data transmission, using configuration and policy information to make these decisions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If a relay UE receives downlink media in MBMS mode for multiple group communications, then network load is reduced and energy efficiency is improved, but it becomes impossible to receive all media when frequency and priority conflicts occur
Solution Approach 1:
The relay UE changes its reception mode parameter from MBMS to unicast when frequency conflicts or priority violations are detected. This parameter change allows the UE to switch between efficient MBMS reception and reliable unicast reception based on current conditions, resolving the contradiction between energy efficiency and reception reliability
2Reliability
If the relay UE prioritizes receiving downlink media based on group communication priorities, then service reliability is improved, but complexity in determining and managing multiple group communications increases
Solution Approach 1:
The relay UE performs preliminary actions by determining priorities of multiple group communications in advance and storing this priority information. When receiving downlink media, it refers to these pre-determined priorities rather than making complex real-time decisions, thus improving service reliability while reducing operational complexity
3Reliability
If the relay UE switches from MBMS mode to unicast mode to ensure reliable data transmission, then reception reliability is improved, but network load increases and energy efficiency decreases
Solution Approach 1:
The relay UE dynamically switches between MBMS mode and unicast mode based on real-time conditions such as frequency availability and priority requirements. This dynamic adaptation allows the system to use energy-efficient MBMS mode when possible and switch to reliable unicast mode only when necessary, balancing reliability and energy efficiency
Data Source
AI summary
Provided in one disclosure of the present specification is a method for relaying a proximity service-based group communication by user equipment (UE) which can operate as a repeater. The method comprises the steps of: confirming whether downlink media of a plurality of group communications is transmitted from a network node according to a multimedia broadcast/multicast service (MBMS) technique; determining whether all of the downlink media of the plurality of group communications can be received according to the MBMS technique; determining a specific group communication of which the downlink media is to be received according to the MBMS technique, based on priority among the group communications and the number of relayed UEs, when all of the downlink media of the plurality of group communications cannot be received according to the MBMS technique; and receiving, according to the MBMS technique, the downlink media of the specific group communication which has been determined and relaying same.