DAPS Path Switching via Relay Nodes for Seamless Handover
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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 involving dual active protocol stack (DAPS) path switches, to minimize service interruptions and ensure continuity during handovers.
Innovation Solution
The implementation of a user equipment (UE) and relay node configuration that includes a transceiver and processor to manage DAPS path switches, with the processor handling bearer suspension or continuation based on received information, and a base station (BS) to transmit RRC reconfiguration messages for DAPS path switches, ensuring seamless communication through timers and notifications.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a traditional path switch is performed during handover, then the handover process is completed, but service interruptions occur and continuity is not ensured
Solution Approach 1:
The UE establishes the target connection before releasing the source connection during handover. The RRC reconfiguration message is received and processed, and the target cell connection is prepared in advance, ensuring that service continuity is maintained without interruption when the path switch occurs.
Solution Approach 2:
The patent implements dual active protocol stack (DAPS) where both source and target connections are simultaneously active during the handover transition. This allows data transmission to continue uninterrupted through either path, eliminating service gaps and ensuring continuous communication throughout the handover process.
2Reliability
If simultaneous connections are maintained during handover, then service continuity is ensured, but device complexity increases
Solution Approach 1:
The patent segments the connection management into distinct phases and protocols. The RRC layer handles connection establishment and reconfiguration, while the data plane independently manages simultaneous source and target connections. This segmentation allows complex DAPS operations to be managed through modular, protocol-specific procedures rather than monolithic control logic.
Solution Approach 2:
The RRC reconfiguration message acts as an intermediary that coordinates the transition between source and target connections. It carries the necessary configuration parameters and instructions that enable the UE to manage dual active connections systematically, reducing the complexity burden on the UE by providing centralized control guidance from the network.
Data Source
AI summary
Embodiments of the present disclosure relate to methods and apparatuses for path switch in a communication system. According to some embodiments of the disclosure, a UE may: communicate with a BS via a relay node; receive, via the relay node from the BS, an RRC reconfiguration message for a DAPS path switch from a source connection to a target connection; and start a timer for path switch in response to receiving the RRC reconfiguration message.