Inter-Cell Interference Mitigation via Time Slot Allocation
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Solution Overview
Problem
Existing GSM cellular systems using synchronous transmission schemes face challenges in mitigating inter-cell interference, as they primarily focus on frequency domain resource allocation, neglecting the potential for interference reduction in the time domain due to lack of synchronization between cells.
Innovation Solution
A method and apparatus that determine cells with dominant interference and allocate different starting time slots for each cell, taking into account the number of cells and idle time resources, to select and allocate time slots with the lowest interference for call setup requests, thereby mitigating inter-cell interference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If frequency domain resource allocation is used in synchronous GSM systems, then resource allocation is simplified, but inter-cell interference cannot be effectively mitigated
Solution Approach 1:
The patent extends resource allocation from the frequency domain to the time domain by introducing time slot assignment as a new dimension. The base station determines starting time slots for each cell and selects time slots based on interference information, creating a two-dimensional resource allocation framework (frequency × time) that enables effective inter-cell interference mitigation while maintaining systematic complexity management.
2Object-affected harmful factors
If time domain resource allocation is introduced to mitigate inter-cell interference, then inter-cell interference is reduced, but system complexity increases
Solution Approach 1:
The base station performs preliminary determination of starting time slots for each cell before actual resource allocation. It pre-calculates time slot assignments based on cell identification and interference patterns, then uses these pre-determined starting points to select optimal time slots for call setup requests. This preliminary action reduces real-time complexity while maintaining effective interference mitigation.
Solution Approach 2:
The system incorporates feedback mechanisms where the base station receives interference information from terminals and uses this feedback to select optimal time slots. The terminal provides interference measurements, and the base station adjusts time slot assignments accordingly, creating a closed-loop system that adapts to actual interference conditions while managing complexity through informed decision-making.
3Object-affected harmful factors
If different starting time slots are assigned to each cell, then inter-cell interference is mitigated, but time resource utilization becomes more complex
Solution Approach 1:
The patent implements dynamic time slot assignment where starting time slots are determined based on current system conditions including cell identification, interference patterns, and available time resources. The base station dynamically selects optimal time slots for each cell and adjusts assignments based on real-time call setup requests and interference information, maintaining flexibility while preventing interference through adaptive rather than static allocation.
Data Source
AI summary
A method for mitigating inter-cell interference by a base station in a cellular communication system. The base station determines cells to which same frequency resources are allocated, and which cause interference to each other, and determines a starting time slot, at which resource allocation to each cell starts, as a different time slot for each cell, taking into account a number of the cells and time slots constituting time resources. In response to receiving a call setup request from a terminal, the base station selects a time slot taking into account interference information of each of the time slots, and allocates a resource based on the selected time slot to the terminal.