Sidelink Handover Coordination for Continuous UE Mobility
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Solution Overview
Problem
Existing wireless communication systems face challenges in efficiently handling handover procedures for sidelink communications, particularly in scenarios where UE transitions between cells of different base stations, leading to disruptions and inefficiencies in data transfer.
Innovation Solution
A system and method for sidelink handover procedures involving user equipment (UE) that receives measurement configuration parameters from a first base station, establishes a sidelink with a second UE, and transmits a measurement report to facilitate a seamless handover to a second cell of a second base station, ensuring continuity of sidelink communications.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional handover procedures are used for sidelink communications, then the network can manage UE mobility, but data transfer disruptions occur and handover efficiency decreases
Solution Approach 1:
The patent applies preliminary action by having the source gNB prepare handover parameters and configure the target gNB before the actual handover execution. The measurement configuration is set up in advance, and the target cell is pre-configured with necessary parameters, enabling seamless handover without data transfer disruptions when the UE moves between cells.
Solution Approach 2:
The patent uses the gNB as an intermediary to manage the handover process. The source gNB and target gNB coordinate through handover preparation procedures, exchanging measurement reports and configuration parameters. This intermediary coordination enables efficient handover while maintaining data transfer continuity, resolving the contradiction between reliability and productivity.
2Adaptability or versatility
If UE transitions between cells of different base stations, then mobility flexibility is achieved, but handover disruptions occur
Solution Approach 1:
The patent implements feedback mechanisms where the UE reports measurement information about neighboring cells to the source gNB. Based on these feedback measurements, the source gNB determines appropriate handover targets and configures the necessary parameters. This feedback loop enables the system to adapt to UE mobility while maintaining communication continuity through informed handover decisions.
Solution Approach 2:
The source gNB performs preliminary handover preparation by configuring the target gNB with necessary parameters before the UE actually moves. This advance preparation ensures that when the UE transitions between cells, the handover can execute seamlessly without disruptions, maintaining both mobility flexibility and communication continuity.
3Device complexity
If handover procedures are simplified, then implementation complexity is reduced, but handover performance deteriorates
Solution Approach 1:
The patent segments the handover procedure into distinct phases: measurement configuration phase, measurement report phase, handover preparation phase, and handover execution phase. Each phase has specific functions and parameters, making the complex handover process more manageable and implementable while maintaining high performance through structured coordination between source and target gNBs.
Data Source
AI summary
A system, method and apparatus for wireless communications is provided. A user equipment (UE) receives, from a first base station, one or more first messages that include measurement configuration parameters and sidelink parameters associated with a first cell. The UE establishes a sidelink with a second UE based on the sidelink parameters and transmits, to the first base station, a measurement report based on the measurement configuration parameters. Responsive to the measurement report, the UE receives a second message comprising second configuration parameters of a second cell of a second base station. The second configuration parameters do not comprise sidelink parameters. The UE then switches from the first cell of the first base station to the second cell of the second base station. The sidelink of the first cell is handed over to an uplink of the second cell.