Group Handover Coordination in Sidelink Groupcast Communication
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Solution Overview
Problem
In sidelink groupcast communication, when member terminals perform handovers to different target base stations, resource collisions occur, leading to deteriorated communication performance.
Innovation Solution
A method where a header terminal manages the handover process by transmitting configuration information messages to member terminals, which perform measurement operations and report results to the header terminal. The header terminal then informs the serving base station of these results, allowing it to determine a target base station for all terminals, thus coordinating their handover to the same base station.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If member terminals independently perform handover to different target base stations, then handover flexibility is improved, but resource collision occurs and communication performance deteriorates
Solution Approach 1:
The header terminal acts as an intermediary between member terminals and the serving base station. It collects measurement reports from member terminals, determines the target base station, and coordinates the handover process for the entire group, preventing resource collisions while maintaining handover flexibility
Solution Approach 2:
The patent merges the handover decisions of multiple member terminals into a single coordinated action. By having the header terminal aggregate measurement reports and select a common target base station for the group, the patent combines individual handover processes into a unified group handover that avoids resource conflicts
2Adaptability or versatility
If each terminal connects to different base stations, then connection diversity is improved, but sidelink resource allocation conflicts worsen
Solution Approach 1:
The header terminal serves as a mediator that coordinates resource allocation between the serving base station and member terminals. It ensures that sidelink resources are consistently allocated across all group members by maintaining a unified base station connection for the entire group, thereby eliminating resource allocation conflicts
Solution Approach 2:
The patent enforces homogeneity in base station connection for all member terminals within a sidelink group. By requiring all terminals to connect to the same target base station determined by the header terminal, the system achieves uniform resource allocation policies across the group, preventing conflicts
3Stability of the object's composition
If centralized handover control is implemented through header terminal, then resource allocation consistency is improved, but control complexity increases
Solution Approach 1:
The header terminal performs self-service by autonomously collecting measurement reports from member terminals, determining the optimal target base station, and coordinating the handover process without requiring complex external control mechanisms. This self-organized approach achieves centralized control while limiting the increase in overall system complexity
Data Source
AI summary
Disclosed are a method and a device for group handover in a communication system. An operation method of a header terminal comprises the steps of: transmitting a configuration information message including a first indicator indicating a measurement reporting subject to member terminals participating in the sidelink groupcast communication; if the measurement reporting subject indicated by the first indicator is the header terminal, receiving, from the member terminals, measurement reporting messages including results of measurement operations performed for at least one neighboring base station; and transmitting a configuration reporting message including the results of the measurement operations to a serving base station accessed by the header terminal.