NTN Handover Configuration Segmentation for Signaling Reduction
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Solution Overview
Problem
In wireless communication systems, particularly in Non-Terrestrial Networks (NTNs), frequent handovers due to satellite movement result in significant signaling overhead and impact power consumption, complicating service continuity and mobility management.
Innovation Solution
Implementing common handover, group handover, and 2-step handover methods in NTNs, where a network predicts and broadcasts target cell configurations, reducing signaling by providing common configurations to multiple UEs and dedicated configurations only when necessary, thereby optimizing handover procedures.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional handover procedures are used in NTN, then service continuity is maintained, but signaling overhead increases significantly
Solution Approach 1:
The handover procedure is segmented into two parts: common handover parameters that are broadcast in system information (SIB) and UE-specific parameters that are transmitted only when needed. This segmentation allows multiple UEs to share common configuration information, reducing redundant signaling while maintaining individual UE service continuity.
Solution Approach 2:
The system information broadcast contains handover parameters that serve multiple UEs simultaneously. By making the handover configuration universal through broadcast mechanisms, the system reduces the need for individual dedicated signaling to each UE, thereby reducing overall signaling overhead while maintaining service continuity for all affected UEs.
2Adaptability or versatility
If frequent handovers are performed due to satellite movement, then mobility management is updated, but power consumption increases
Solution Approach 1:
The network broadcasts handover parameters in advance through system information before actual handover is needed. This preliminary action allows UEs to prepare for upcoming handovers without requiring frequent dedicated signaling, reducing the power consumption associated with processing and executing frequent handover commands while maintaining adaptability to satellite movement.
Solution Approach 2:
UEs autonomously monitor broadcast system information for handover parameters and independently prepare for handovers without requiring continuous network signaling. This self-service mechanism reduces the power consumption at both network and UE sides by eliminating redundant signaling loops while maintaining mobility management effectiveness.
3Manufacturing precision
If dedicated UE configurations are provided for each handover, then handover precision is improved, but signaling overhead increases
Solution Approach 1:
Handover configuration is segmented into common parameters broadcast in system information and UE-specific parameters transmitted only when necessary. This segmentation maintains handover precision for individual UEs while significantly reducing overall signaling overhead by eliminating redundant common parameter transmissions for each UE.
Solution Approach 2:
The system provides universal handover parameters through broadcast (common quality) while maintaining the option to provide UE-specific customized parameters only when needed (local quality). This approach ensures handover precision is maintained for individual UEs without the penalty of transmitting customized configurations for all UEs in every scenario.
Data Source
AI summary
Systems and apparatuses are provided for a method for a first network node in a wireless communication system comprising receiving a first configuration from a second network node, broadcasting the first configuration via a system information in a first cell, transmitting a handover request to the second network node, wherein the handover request indicates to skip the first configuration in a handover command, receiving, in response to transmitting the handover request, the handover command in a handover request acknowledge from the second network node, wherein the handover command includes a second configuration and does not include the first configuration, and transmitting the handover command to a User Equipment (UE).