Hard Migration Handover for Mobile Base Stations
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Solution Overview
Problem
The mobility of base stations in wireless communication networks poses challenges in maintaining continuous coverage and efficient handover processes, especially in urban environments where real estate constraints and high user density require innovative deployment solutions.
Innovation Solution
The implementation of a wireless terminal and access node system that includes receiver and processor circuitry to execute handover instructions with hard migration information, allowing for the deactivation of one cell before activating another, ensuring seamless communication through vehicle-mounted relays.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If vehicle-mounted relays are deployed to provide coverage in urban environments, then coverage area and capacity are improved, but handover reliability deteriorates due to mobility
Solution Approach 1:
The patent applies preliminary action by configuring the wireless terminal with handover parameters and target cell information in advance before the actual handover event. The terminal receives and stores handover configuration messages from the access node, including parameters for selecting target cells and timing information, so that when handover becomes necessary, the terminal can execute the handover procedure quickly and reliably without delay, thus maintaining connection reliability despite the mobile relay's movement
2Adaptability or versatility
If base stations are made mobile to overcome real estate constraints, then deployment flexibility is improved, but handover process complexity increases
Solution Approach 1:
The patent implements feedback mechanisms where the access node continuously monitors the wireless terminal's connection status and relay vehicle position, then sends feedback messages containing handover instructions and target cell configurations to the terminal. This feedback loop enables the system to automatically adjust handover parameters based on real-time conditions, simplifying the handover process complexity through automated control rather than manual configuration
3Speed
If hard migration is implemented with deactivation before activation, then handover speed is improved, but connection stability worsens
Solution Approach 1:
The patent applies beforehand cushioning by configuring the wireless terminal with pre-calculated handover parameters and target cell information before the actual handover event. The terminal stores handover configuration messages that include timing information and selection criteria, creating a buffer of prepared resources that enable rapid handover execution while maintaining connection stability through advance preparation rather than reactive response
Data Source
AI summary
A wireless terminal communicates with a first cell comprises receiver circuitry and processor circuitry. The receiver circuitry is configured to receive, from the first cell, a message comprising: (a) an instruction for a handover to a second cell; (b) a target cell configuration including a cell identity and an operating frequency of the second cell, and (c) hard migration information associated with the target cell configuration. The hard migration information indicates that the first cell will be deactivated before the second cell gets activated. The processor circuitry is configured to execute the handover to the second cell based on the instruction, the target cell configuration, and the hard migration information. In an example embodiment and mode, the hard migration information comprises: a deactivation time upon which the first cell gets deactivated, and an activation time upon which the second cell gets activated.