Base Station Controller Handover Frequency Allocation
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Solution Overview
Problem
Conventional GSM mobile communication systems face challenges with handover latency and call drops due to signaling delays and limited frequency reuse, leading to inefficiencies in frequency allocation and potential interference between cells.
Innovation Solution
A method where a base station controller manages handovers by determining if resources of the same frequency and time slot used by the serving cell are available in the target cell, allowing for allocation and activation of these resources to support seamless handovers without additional signaling, effectively treating adjacent cells as a single cell for frequency reuse.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If frequency reuse is applied in GSM systems with fixed frequency allocation patterns, then frequency allocation is simplified and interference between cells is reduced, but frequency efficiency is limited and adjacent cells cannot utilize all available frequencies
Solution Approach 1:
The patent applies dynamics by transitioning from static, fixed frequency allocation patterns to dynamic frequency assignment. The base station controller dynamically determines target cell frequencies based on real-time handover conditions and terminal requirements, allowing frequencies to be reassigned flexibly rather than following predetermined patterns. This enables adjacent cells to utilize all available frequencies while maintaining interference management.
Solution Approach 2:
The patent changes the frequency allocation parameter from fixed patterns to dynamic assignment based on handover conditions. By modifying the frequency parameter according to the specific circumstances of each handover event and terminal capability, the system achieves higher frequency efficiency while maintaining simplicity in the allocation mechanism through automated controller decisions.
2Object-affected harmful factors
If conventional frequency reuse patterns are used, then interference between adjacent cells is reduced, but handover latency increases due to signaling requirements and resource allocation delays
Solution Approach 1:
The patent applies preliminary action by having the base station controller pre-determine the target cell frequency and allocate resources before the actual handover execution. The controller checks frequency availability and assigns optimal frequencies in advance, so that when handover is needed, the frequency is already prepared and can be activated immediately without additional signaling delays.
Solution Approach 2:
The base station controller acts as an intermediary that mediates between the serving cell and target cell frequency allocation. Instead of requiring direct terminal signaling and coordination between multiple cells, the controller centralizes the frequency determination and resource allocation process, simplifying the handover procedure and reducing latency by handling all frequency coordination internally.
3Device complexity
If fixed frequency allocation is used in GSM systems, then system complexity is reduced, but adaptability to dynamic handover conditions and terminal mobility is limited
Solution Approach 1:
The patent applies self-service by enabling the base station controller to autonomously determine optimal frequency assignments and allocate resources without requiring complex external coordination. The controller independently evaluates handover conditions, checks frequency availability in target cells, and makes frequency assignment decisions automatically, reducing system complexity while improving adaptability to dynamic conditions.
Solution Approach 2:
The patent makes the frequency allocation mechanism universal by allowing the same dynamic assignment process to handle various handover scenarios and terminal types. The base station controller uses a unified approach that works for different frequency conditions, terminal capabilities, and network configurations, providing versatile frequency allocation without increasing overall system complexity.
Data Source
AI summary
The present disclosure proposes a method for supporting a handover by a base station controller in a cellular mobile communication system including a terminal for performing a handover from a serving cell base station to a target cell base station, the method comprising the steps of: determining handover performance of the terminal; checking whether a resource of the same frequency and time slot as a frequency and time slot of a resource in use by the serving cell base station is usable in the target cell base station; and allocating a resource of the same frequency and time slot to the target cell base station, and transmitting a message indicating channel activation of the allocated resource to the target cell base station.