Relay-Terminal Handover Configuration for Sidelink Service Continuity
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Solution Overview
Problem
Existing technologies do not provide a solution for seamless handover of UE in a relay scenario, leading to service interruption and compromised user experience in sidelink communication.
Innovation Solution
A method and apparatus for handover in relay scenarios, involving a relay terminal receiving configuration information to access a target cell, and a network device sending configuration information to facilitate a smooth handover process, ensuring continuity of sidelink interfaces and data transmission.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a relay terminal hands over to a target cell without including remote terminal configuration information, then the handover process is simple and fast, but service interruption occurs and user experience deteriorates
Solution Approach 1:
The network device performs preliminary actions by including the remote terminal's target cell configuration information in the handover request message sent to the target cell, and the target cell prepares the configuration information in advance before the relay terminal actually hands over. This ensures that when the handover occurs, the remote terminal can seamlessly connect to the target cell without service interruption.
Solution Approach 2:
The handover request message and handover request acknowledgment message serve as intermediaries to transfer the remote terminal's configuration information between the network device, target cell, and relay terminal. This intermediary mechanism enables the complex configuration information to be transmitted through standardized signaling procedures, managing the complexity systematically.
2Reliability
If the network device sends comprehensive target cell configuration information for both relay and remote terminals, then service continuity is ensured, but the signaling overhead and processing complexity increase
Solution Approach 1:
The patent merges the relay terminal's handover configuration and the remote terminal's target cell configuration into a single handover request message flow. The network device includes both configuration sets in the handover request to the target cell, which then forwards the remote terminal's configuration to the relay terminal. This combining approach ensures both terminals receive necessary configuration information while using standardized handover signaling procedures.
3Speed
If the relay terminal independently selects resources without base station scheduling, then resource allocation is fast and flexible, but coordination with target cell and service continuity become difficult
Solution Approach 1:
The target cell performs preliminary resource allocation and configuration preparation before the relay terminal completes its handover. The network device includes the remote terminal's target cell configuration information in advance in the handover request message, enabling the target cell to prepare resource allocation beforehand. This preliminary action ensures fast resource allocation while maintaining coordination and service continuity.
Data Source
AI summary
This application discloses a handover method and apparatus, a terminal device, and a network device. The handover method includes: receiving a first message sent by a source cell, where the first message is used to instruct a relay terminal to hand over to a target cell, the first message carries target configuration information of the target cell, and the target configuration information includes first configuration information of the relay terminal and second configuration information of data of a remote terminal on a Uu interface, where the remote terminal is a remote terminal of the relay terminal; and accessing the target cell according to the target configuration information.