Mobility Management for Fixed and Mobile Transmission Points
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Solution Overview
Problem
In networks with mobile transmission points, existing mobility control mechanisms often lead to inappropriate handover decisions and excessive signaling overhead, causing service quality issues and unnecessary handovers, especially for in-vehicle and street-side UEs.
Innovation Solution
The implementation of discovery reference signals and maintenance reference signals by mobile transmission points, allowing UEs to distinguish between fixed and mobile TRPs, and imposing conditions for measurement reporting based on speed and signal strength, helps in efficient cell reselection and handover management.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If existing mobility control mechanisms are used in networks with mobile transmission points, then UEs can maintain basic connectivity, but inappropriate handover decisions and excessive signaling overhead occur
Solution Approach 1:
The patent segments the reference signal functionality into two distinct types: discovery reference signals for initial detection and synchronization, and maintenance reference signals for connection maintenance. This segmentation allows UEs to differentiate between fixed and mobile TRPs, enabling more accurate handover decisions and reducing unnecessary signaling overhead while maintaining service quality.
2Productivity
If UEs connect to mobile transmission points based on signal strength alone, then in-vehicle UEs benefit from strong signal connection, but street-side UEs experience unnecessary handovers and ping-pong effects
Solution Approach 1:
The patent applies local quality by transmitting different types of reference signals (discovery vs. maintenance) from mobile transmission points. In-vehicle UEs can detect and maintain connections to mobile TRPs using these specialized signals, while street-side UEs can distinguish mobile from fixed TRPs and avoid inappropriate handovers. This localized differentiation resolves the contradiction between serving in-vehicle and street-side UEs effectively.
Data Source
AI summary
In a network comprising both fixed transmission points and mobile transmission points, the transmission points may transmit discovery reference signals that allow WTRUs to detect and/or synchronize to the transmission points. The fixed and mobile transmission points may transmit discovery reference signals with different characteristics that allow the WTRUs to distinguish between fixed and mobile transmission points. The mobile transmission points may also transmit a separate maintenance reference signal that allows WTRUs to maintain a connection with the mobile transmission point. For networks in which fixed a mobile transmission points operate in different frequency bands, the mobile transmission points may also periodically transmit discovery beacon signals in the frequency band of the fixed transmission points to allow discovery. Conditions may be imposed on WTRUs before the WTRU will transmit to the network a measurement report reporting on a potential transmission point to which it may be switched. Such conditions may include the speed of a WTRU relative to the transmission point with which it is currently associated, the speed of the WTRU relative to the newly discovered transmission point or both.