Subcarrier Group Allocation for Inter-Cell Interference Reduction
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Solution Overview
Problem
The sub-PRB resource allocation method for eFeMTC in Release-15 leads to mutual interference between neighboring cells due to the use of shared subcarriers, necessitating a method to reduce this interference.
Innovation Solution
A resource allocation method that determines subcarrier groups for terminal devices based on physical cell identity (PCID) and a preset rule, allowing devices in different cells to use distinct subcarrier groups, thereby minimizing interference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If sub-PRB resource allocation is used to increase spectral efficiency, then spectral efficiency is improved, but mutual interference between neighboring cells increases
Solution Approach 1:
The patent applies local quality by configuring different subcarrier groups for terminal devices in different cells. Each cell's terminal devices use locally optimized subcarrier groups determined by the cell's physical cell identity (PCID), ensuring that while sub-PRB allocation is used to maintain spectral efficiency, the local resource allocation patterns differ between neighboring cells to reduce mutual interference.
Solution Approach 2:
The patent changes the parameter of subcarrier group configuration based on the physical cell identity (PCID). By using the PCID to determine which subcarrier groups are allocated to terminal devices in each cell, the system dynamically adjusts resource allocation parameters to ensure that neighboring cells use different subcarrier groups, thereby reducing interference while maintaining spectral efficiency through sub-PRB allocation.
2Device complexity
If terminal devices in different cells use the same subcarrier groups, then resource allocation simplicity is maintained, but interference between cells increases
Solution Approach 1:
The patent implements local quality by making subcarrier group allocation cell-specific. Each cell uses its physical cell identity (PCID) to determine the subcarrier groups allocated to its terminal devices, creating locally optimized resource allocation patterns that reduce interference between neighboring cells while maintaining overall system simplicity through standardized allocation procedures.
Solution Approach 2:
The patent changes the resource allocation parameter (subcarrier group selection) based on the cell's PCID. This parameter change ensures that terminal devices in different cells are allocated different subcarrier groups, reducing inter-cell interference. The method maintains simplicity by using a standardized PCID-based determination mechanism rather than complex centralized coordination.
Data Source
AI summary
A resource allocation method and an apparatus to reduce mutual interference between neighboring cells. The method includes: determining, by a first terminal device based on a physical cell identity PCID of a first cell accessed by the first terminal device and a preset rule, a subcarrier group corresponding to the first terminal device, where the subcarrier group corresponding to the first terminal device includes some subcarriers in a subcarrier set corresponding to the first terminal device. A communications system supports sub-PRB resource allocation.