Inter-Frequency Cell Reselection for Vehicle-Mounted Relay Mobility
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Solution Overview
Problem
The mobility of base stations in wireless communication systems poses challenges in maintaining effective cellular coverage and capacity, especially in urban environments where real estate availability and regulatory constraints limit traditional base station deployment.
Innovation Solution
A wireless terminal and a mobile base station relay system that communicates via dedicated signaling to manage cell reselection priorities. The system receives inter-frequency neighboring cell information, including cell identity, radio frequency, and reselection priority, and adjusts these priorities based on indications of whether the serving cell will be replaced by a neighboring cell.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If vehicle-mounted relays are deployed to provide 5G coverage in urban environments, then cellular coverage and capacity are improved, but maintaining stable connections becomes difficult due to base station mobility
Solution Approach 1:
The patent implements dynamic cell reselection priority adjustment where the serving cell modifies the priority of neighboring cells based on its own mobility state. When the serving cell detects it is moving (vehicle-mounted relay), it dynamically adjusts neighboring cell priorities to prevent premature reselection, thereby maintaining connection stability while providing mobile coverage.
2Area of stationary object
If traditional base stations are deployed in urban environments, then network coverage is improved, but deployment costs and regulatory constraints increase due to real estate availability and installation burdens
Solution Approach 1:
The patent employs vehicle-mounted relays that copy base station functionalities (gNB) to provide 5G coverage. Instead of deploying physical base stations requiring real estate and infrastructure, the system uses mobile devices with base station software, eliminating deployment barriers while maintaining coverage capability.
3Duration of action of stationary object
If cell reselection procedures are performed frequently to maintain coverage with mobile base stations, then coverage continuity is improved, but network performance and user experience deteriorate due to excessive reselections
Solution Approach 1:
The patent implements a feedback mechanism where the serving cell monitors its own mobility state and uses this information to adjust neighboring cell reselection priorities. This feedback loop prevents excessive reselections by adapting the reselection criteria to the actual mobility condition, thereby maintaining coverage continuity while preserving network performance.
Data Source
AI summary
The wireless terminal which communicates with a serving cell served by a mobile base station relay comprises receiver circuitry and processor circuitry. The receiver circuitry is configured to receive: via a dedicated signaling, dedicated cell reselection priority information; and from the serving cell, inter-frequency neighboring cell information comprising: a cell identity of a neighboring Scell, a radio frequency of the neighboring cell, common cell reselection priority information associated with the radio frequency of the neighboring cell, and an indication associated with the cell identity of the neighboring cell. The indication indicates whether or not the serving cell will be replaced by the neighboring cell. The processor circuitry is configured to: store the dedicated cell reselection priority information; and perform, based on the inter-frequency neighboring cell information, a cell reselection procedure. The processor circuitry is configured not to use the dedicated cell reselection priority information in the cell reselection procedure in a case that the indication indicates that the serving cell will be replaced by the neighboring cell.