Target Base Station L1/L2 Mobility Cancellation for Handover Control
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Solution Overview
Problem
Existing wireless communication systems face challenges in efficiently managing mobility events, particularly in heterogeneous networks, leading to increased latency and resource inefficiencies due to suboptimal handover processes.
Innovation Solution
Implementing Layer 1 and Layer 2 triggered mobility cancellation mechanisms initiated by the target base station to optimize handover procedures, reducing unnecessary handovers and improving network resource utilization.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of time
If traditional handover procedures are used in heterogeneous networks, then mobility management is maintained, but latency increases and network resources are inefficiently utilized
Solution Approach 1:
The system performs preliminary actions by configuring L1/L2 triggered mobility mechanisms in advance, where the target base station prepares mobility cancellation indications before actual handover execution. This allows the network to preemptively cancel unnecessary handovers based on real-time conditions, reducing latency and optimizing resource utilization by avoiding redundant handover procedures.
2Speed
If handover procedures are frequently triggered, then mobility responsiveness is improved, but unnecessary handovers increase and consume additional network resources
Solution Approach 1:
The system implements feedback mechanisms where the target base station continuously monitors handover conditions and sends mobility cancellation indications back to the source base station and UE when handovers are determined to be unnecessary. This feedback loop enables the network to respond dynamically to changing conditions, canceling handovers that would consume resources without providing benefit, thus optimizing the balance between mobility responsiveness and resource consumption.
3Productivity
If L1/L2 triggered mobility is implemented, then handover efficiency is improved, but system complexity increases
Solution Approach 1:
The system introduces an intermediary mechanism where the target base station acts as a mediator in the handover process by generating and sending mobility cancellation indications. This intermediary approach simplifies the overall system architecture by centralizing the decision-making logic for handover cancellation at the target base station, reducing the complexity burden on UEs and source base stations while maintaining high handover efficiency through coordinated network control.
Data Source
Figure 1A~1B
Figure 2A~2B
Figure 3
AI summary
A wireless device transmits, to a base station, a measurement report message and receives, from the base station, a first radio resource control (RRC) reconfiguration message comprising a layer 1/layer 2 triggered mobility (LTM) configuration comprising an LTM candidate configuration of a candidate cell for an LTM, an identifier of the LTM candidate configuration, and a cell identifier of the candidate cell. The wireless device transmits, after receiving the first RRC reconfiguration message and to the base station, an RRC reconfiguration complete message and transmits, to the base station, a layer 1 measurement report and receives, from the base station, a second RRC reconfiguration message indicating to release the LTM candidate configuration. A cancelling of the LTM is indicated by an LTM cancel message comprising the identifier of the candidate cell and a cause value indicating a reason for the cancelling of the LTM of the candidate cell.