UE–Relay Node Group Path Switching for Synchronized Handovers
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Solution Overview
Problem
There is a need for efficiently performing communication in a communication system supporting UE-to-network (U2N) relay, particularly in handling group-based path switches involving UEs and relay nodes in wireless communication systems.
Innovation Solution
The implementation of a UE and relay node configured to receive and process RRC reconfiguration messages for path switch and handover, including indications for successful or unsuccessful handovers, timers, and entity reestablishment, to facilitate seamless group-based path switches.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If separate handover procedures are used for relay node and remote UE, then handover control flexibility is improved, but handover time and system complexity increase
Solution Approach 1:
The patent combines the handover procedures for relay node and remote UE into a single group-based path switch operation. The network simultaneously switches both the relay node and remote UE to the target cell through one coordinated procedure, eliminating the need for separate handover operations and reducing overall handover time while maintaining control flexibility.
Solution Approach 2:
The network performs preliminary actions by preparing the target cell and configuring path switch parameters before executing the actual handover. The RRC reconfiguration message includes pre-configured parameters for both relay node and remote UE, enabling simultaneous switching without requiring sequential operations.
2Device complexity
If separate handover procedures are used for relay node and remote UE, then procedural simplicity is improved, but communication reliability deteriorates
Solution Approach 1:
By merging the handover procedures into a single group-based path switch operation, the patent ensures that both relay node and remote UE are switched simultaneously to the target cell. This coordinated approach eliminates timing mismatches and synchronization issues that would arise from separate procedures, thereby improving communication reliability.
Solution Approach 2:
The patent implements feedback mechanisms where the network receives status information from both relay node and remote UE during the handover process. The network uses this feedback to coordinate the path switch operation and ensure both entities are successfully switched, improving reliability while managing procedural complexity.
3Speed
If path switch is executed without relay node handover completion, then path switch speed is improved, but communication stability deteriorates
Solution Approach 1:
The network performs preliminary configuration of the path switch parameters and target cell preparation before executing the actual switching operation. This allows the path switch to be executed efficiently without requiring the relay node handover to complete first, while maintaining communication stability through proper parameter configuration and coordination.
Solution Approach 2:
The patent implements a dynamic handover mechanism where the network can execute path switch at different stages of relay node handover completion. The system adapts the timing and sequencing of path switch based on real-time conditions, allowing faster path establishment while maintaining stability through flexible coordination between relay node and remote UE states.
Data Source
AI summary
Embodiments of the present disclosure relate to methods and apparatuses for wireless communications in a communication system. According to some embodiments of the disclosure, a UE may: communicate with a BS via a relay node; and receive, via the relay node from the BS, an RRC reconfiguration message for path switch, wherein the RRC reconfiguration message for path switch indicates that the UE and the relay node are switched together.