Multi-TRP Handover via MAC Layer Signaling
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Solution Overview
Problem
Current cellular wireless networks face limitations in providing high data rates and reliable handover procedures, especially at the cell edge due to inter-cell interference and frequent handovers, which lead to increased latency and signaling overhead, particularly in 5G and anticipated 6G systems using terahertz frequencies.
Innovation Solution
A multi-TRP (Transmission/Reception Point) system with a cell-free architecture that allows for dynamic handover procedures by selecting candidate TRPs based on measurement reports and configuration comparisons, using lower-layer signaling to manage handovers without explicit RRC signaling, thereby reducing latency and increasing throughput.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional handover procedures are used in cellular networks, then handover can be performed between cells, but signaling overhead and latency increase due to frequent RRC signaling exchanges
Solution Approach 1:
The patent extracts the handover control function from the traditional RRC layer to lower layers (MAC layer), removing the need for frequent RRC signaling exchanges. This allows handover decisions to be made and executed at the MAC layer using existing measurement reports and configuration comparisons, significantly reducing signaling overhead and handover latency while maintaining reliability
Solution Approach 2:
The patent introduces a MAC layer intermediary that handles handover control between the RRC layer and physical layer. This intermediary uses measurement reports and configuration comparisons to make handover decisions without requiring explicit RRC signaling, acting as a mediator that reduces the signaling burden while ensuring reliable handover execution
2Speed
If multi-TRP handover is implemented without configuration comparison, then handover speed increases, but handover failures occur due to configuration incompatibility
Solution Approach 1:
The patent performs preliminary configuration comparison between source and candidate TRPs before executing handover. By comparing configurations in advance and only selecting candidates with compatible configurations, the system ensures handover success while maintaining fast execution through MAC layer control, preventing failures due to configuration incompatibility
3Area of stationary object
If cell-free multi-TRP architecture is used, then coverage and capacity improve, but system complexity increases due to dynamic TRP selection and coordination
Solution Approach 1:
The patent implements self-service mechanisms where TRPs autonomously select candidates and execute handovers based on pre-configured parameters and measurement reports. The MAC layer automatically compares configurations and makes handover decisions without complex centralized coordination, reducing system complexity while enabling dynamic multi-TRP operation and improved coverage
Data Source
AI summary
The present disclosure relates to wireless communication system and more particularly relates to the design of handover procedures for multi TRP system for a mobile station and other devices. Multi TRP per cell or cell less or cell free architecture removes the boundaries of the cell. A method of handover for a UE in a multi TRP system comprising selecting a set of candidate TRPs for the UE for a handover operation and receiving a measurement report from the UE. The source node determines a trigger for handover of the UE in response to the measurement report and compares a configuration of the source node with a configuration of a candidate TRP from the set of candidate TRPs. The source node triggers a handover command to perform a handover operation for the UE with at least one candidate TRP based on a result of the comparison.