Terminal Handover via Controller-Allocated Control Channel Resources
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Solution Overview
Problem
Current handover methods in wireless networks, particularly in mixed macro and micro base station deployments, suffer from data transmission interruptions and inefficiencies due to high cell management and maintenance costs, as well as unstable transmission rates.
Innovation Solution
A terminal handover method where a controller allocates and configures a radio identifier and control channel resource for a terminal to use across multiple base stations, allowing seamless handover without re-configuration, thereby minimizing data transmission interruptions and enhancing efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional handover procedures are used in mixed macro and micro base station networks, then handover control is maintained, but data transmission interruption occurs and latency increases
Solution Approach 1:
The terminal performs measurements and prepares handover information in advance before actual handover is needed. The terminal continuously monitors base stations and pre-calculates handover parameters, so when handover is triggered, the terminal can immediately switch without waiting for measurement reporting and handover command sequences, thereby eliminating data transmission interruption.
Solution Approach 2:
The terminal autonomously performs handover decisions and executions without requiring network control plane intervention. The terminal independently evaluates base station signals, selects target base stations, and executes handover locally, freeing the network from complex control procedures and enabling seamless data transmission during handover.
2Reliability
If multiple connections are established between terminal and multiple cells to avoid data interruption, then data transmission continuity is improved, but cell management complexity and maintenance costs increase
Solution Approach 1:
The patent extracts the handover control function from the network side and places it entirely on the terminal side. By removing network involvement in handover decision-making and execution, the complexity of managing multiple cell connections is eliminated while maintaining data transmission continuity through autonomous terminal-based handover.
Solution Approach 2:
Instead of the network managing and controlling terminal connections to multiple cells, the inversion approach allows the terminal to independently manage its own connections and autonomously switch between cells. This reverses the traditional control hierarchy and simplifies network management while ensuring data continuity.
3Loss of time
If pre-handover method is used to shorten control plane latency, then handover preparation time is reduced, but data transmission interruption still occurs
Solution Approach 1:
The terminal autonomously executes handover without requiring network control plane procedures. The terminal independently completes measurement, target selection, and handover execution, eliminating the need for handover commands and completion procedures that cause data interruption in traditional pre-handover methods.
Solution Approach 2:
The terminal continuously performs measurements and pre-calculates handover parameters in advance, maintaining ready-to-execute handover information. When handover conditions are met, the terminal immediately executes the pre-prepared handover, achieving both short latency and continuous data transmission without network intervention.
Data Source
AI summary
In a terminal handover method, a controller sends a radio identifier and a control channel resource of a terminal that are configured by the controller to the terminal. When the terminal is located in a coverage area of a first base station, the controller sends the radio identifier and the control channel resource of the terminal to the first base station. The controller determines that the terminal is located in a coverage area of a second base station, and sends the radio identifier and the control channel resource of the terminal to the second base station. The terminal receives the control signalling sent from the first base station and the second base station separately by using the control channel resource.