Multi-Path Sidelink Communication for Seamless Handover
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Solution Overview
Problem
Service continuity in sidelink communication is challenged by connectivity interruptions due to mobility or poor channel conditions, particularly when switching between direct and indirect communication paths.
Innovation Solution
A multi-path communication approach is implemented, where a remote UE maintains both direct and indirect communication paths with a gNB, and dynamically switches to a new path when one becomes unavailable, ensuring seamless service continuity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a single communication path (direct or indirect) is used between Remote UE and gNB, then the system complexity is low, but service continuity is compromised due to connectivity interruptions from mobility or poor channel conditions
Solution Approach 1:
The communication path is segmented into multiple independent paths (direct path and indirect path via relay UE). Each path can be independently maintained and managed, allowing the system to switch between them without affecting the other, thereby ensuring service continuity while managing complexity through modular path management
Solution Approach 2:
The system dynamically adjusts the communication path based on channel conditions and mobility states. The Remote UE can switch between direct and indirect paths dynamically, and the gNB can configure path changes based on observed channel quality, making the system adaptable to changing conditions while maintaining service continuity
2Reliability
If multiple communication paths are maintained simultaneously, then service continuity is improved through automatic path switching, but the device complexity increases due to path management overhead
Solution Approach 1:
The gNB acts as an intermediary that manages the configuration and switching between multiple communication paths. The gNB receives measurement reports from the Remote UE, determines the appropriate path configuration, and sends reconfiguration messages to the Remote UE and relay UE, thereby reducing the complexity burden on the Remote UE while maintaining connectivity reliability
Solution Approach 2:
The system implements feedback mechanisms where the Remote UE continuously monitors and reports channel conditions (e.g., RSRP measurements) to the gNB. Based on this feedback, the gNB makes informed decisions about path configuration and switching, ensuring reliable connectivity while managing complexity through data-driven decisions
Data Source
AI summary
The invention refers to a method performed by a wireless device, remote UE (10), wherein the remote UE (10) is connected to a cell established by a base station, gNB (50), wherein the UE performs the steps of: maintaining a first and a second communication path, wherein each the first and the second communication path is either a direct path (110), where the communication is exchanged directly between the remote UE and the gNB, or an indirect path (120, 130), wherein the communication is exchanged between the UE and the gNB via a relay UE (20, 30); determining that one of communication paths becomes or will become unavailable; and activating a third communication path (140, 150) to replace the communication paths that becomes or will become unavailable; the invention further refers to corresponding methods in a relay UE and in a gNB, and to corresponding devices comprising the remote UE, the relay UE and the gNB.