NTN Handover Signaling Using Geographic UE Grouping
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Solution Overview
Problem
In Non-Terrestrial Network (NTN) scenarios, simultaneous handovers of multiple User Equipments (UEs) to a target base station result in significant signaling overhead due to traditional handover procedures, which are not optimized for large-coverage NTN environments.
Innovation Solution
A method involving measurements on radio signals to determine geographical location and relative positional relations, using multiple thresholds and conditional signaling to reduce unnecessary measurements and reports, allowing simultaneous handovers based on positional information from a subset of UEs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional handover procedure is used for multiple UEs in NTN, then handover function is achieved, but signaling overhead increases greatly
Solution Approach 1:
The patent merges the handover procedures of multiple UEs by allowing a single measurement report from one representative UE to trigger handover for multiple UEs in the same geographical zone. This combines what would traditionally be separate handover processes into a single coordinated action, significantly reducing signaling overhead while maintaining handover functionality for all affected UEs.
Solution Approach 2:
The patent segments the large coverage area of NTN into multiple geographical zones. Within each zone, UEs are grouped together and subject to the same handover decision. This segmentation allows the system to apply different handover strategies to different zones independently, reducing the overall signaling load by handling zones rather than individual UEs.
2Measurement precision
If all UEs perform measurement and send measurement report, then handover decision accuracy is improved, but measurement and report overhead increases
Solution Approach 1:
The patent combines the measurement and reporting actions of multiple UEs into a single representative measurement report. Instead of each UE performing independent measurements and sending separate reports, one UE per geographical zone performs the measurement and sends a single report that represents the conditions for all UEs in that zone, maintaining decision accuracy while reducing overhead.
Solution Approach 2:
The system uses the measurement capability of UEs already present in the network to serve the handover decision-making process for multiple UEs. The representative UE's measurement serves not only its own handover needs but also provides the basis for handover decisions for other UEs in the same zone, eliminating redundant measurement and reporting actions.
Data Source
AI summary
A method and a device in a communication node used for wireless communications. A first node performs measurement on a first radio signal, and receives a first signaling; transmits a second radio signal when a first condition is fulfilled; otherwise, transmits transmission of the second radio signal; herein, the measurement performed on the first radio signal is used to determine a first measurement value; the first condition comprises a relative magnitude between the first measurement value and a first reference value, the first condition comprising a first geographical location of the first node and a relative positional relation between the first node and a reference geographical zone; the first signaling is used to determine the first reference value. The present disclosure can reduce the signaling overhead related to the measurement and measurement report during the procedure of UE handover between base stations, thus achieving synchronous handover of multiple users.