Relay Handover Reestablishment Using Candidate Relay Selection
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Solution Overview
Problem
There is a need for efficient communication in wireless communication systems that support UE-to-network relays, particularly in scenarios where user equipment (UE) moves between coverage areas and requires seamless handover and reestablishment.
Innovation Solution
A method involving the reception of an RRC reconfiguration message with a path switch indication and a list of candidate relays, followed by selecting a target relay and transmitting an RRC reconfiguration sidelink message, and initiating a reestablishment procedure in response to handover or radio link failure, with the ability to select a target node from candidate cells or relays.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a UE uses a single relay node for communication, then the connection is simple to manage, but the reliability decreases when the relay node fails or coverage is lost
Solution Approach 1:
The patent combines multiple relay nodes into a single communication path by selecting one target relay from multiple candidate relays. The network configures the UE with multiple candidate relays but the UE merges these options into a single active connection, balancing reliability through selection diversity while maintaining simple single-relay communication management
Solution Approach 2:
The network performs preliminary action by pre-configuring multiple candidate relays to the UE before handover or connection failure occurs. The RRC reconfiguration message includes a list of candidate relays with their identifiers and configuration parameters, enabling the UE to quickly select an alternative relay when needed without complex real-time discovery procedures
2Adaptability or versatility
If the system supports multiple candidate relays for handover, then the adaptability improves, but the signaling overhead increases
Solution Approach 1:
The patent segments the relay configuration information into two parts: candidate relay identifiers (which can be compactly represented) and full configuration parameters (which are provided on-demand). This segmentation allows the system to support multiple candidates with reduced signaling overhead by only transmitting essential identification information initially
Solution Approach 2:
The RRC reconfiguration message structure is designed to be universal, serving multiple functions: it can carry path switch indications, candidate relay lists, and full configuration parameters in a single message type. This multi-functionality reduces the need for separate dedicated messages for each piece of information, lowering overall signaling overhead
3Reliability
If the UE performs frequent relay switching to maintain optimal connection, then the connection quality improves, but the handover frequency and system complexity increase
Solution Approach 1:
The patent implements dynamic relay selection where the UE can switch between candidate relays based on real-time connection quality measurements. The system maintains a configured list of candidate relays and allows the UE to dynamically select the best one, balancing connection quality optimization with controlled handover frequency through measurement-based triggering
Data Source
AI summary
Embodiments of the present disclosure relate to methods and apparatuses for handover and reestablishment in a wireless communication system. According to some embodiments of the disclosure, a method may include: receiving, at a user equipment (UE), a radio resource control (RRC) reconfiguration message including a path switch indication and a list of candidate relays; selecting a target relay from the list of candidate relays; and establishing a PC5 RRC connection with the target relay. Furthermore, the UE may select another target relay for path switch if a path switch failure associated with the first selected target relay happens.