Radio Resource Allocation for Inter-Cell Interference Reduction
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Solution Overview
Problem
Current cellular communication systems face challenges in mitigating inter-cell interference, especially in high-capacity scenarios where inter-node communication is limited, leading to suboptimal throughput and performance.
Innovation Solution
The method involves dividing radio resources into multiple groups and allocating them to user equipment based on the interference generated to neighboring cells, allowing for reduced inter-cell interference and increased throughput without relying on extensive physical layer information exchange between network nodes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If frequency reuse is applied to increase transmission capacity, then more radio channels can be utilized, but inter-cell interference increases
Solution Approach 1:
The radio resources are divided into multiple groups (first group and second group), allowing different cells to use different groups at different times. This segmentation enables frequency reuse while controlling interference by ensuring that cells using the same frequency group are sufficiently separated in time or space.
Solution Approach 2:
The method employs periodic switching between different radio resource groups in a time-division manner. Cells alternate between using the first group and second group of radio resources, creating a periodic pattern that allows frequency reuse while managing interference through temporal separation.
2Adaptability or versatility
If dynamic channel allocation is used to improve resource utilization, then channel resources can be shared more flexibly, but system performance deteriorates under heavy traffic load
Solution Approach 1:
The system dynamically allocates radio resources by switching between predetermined groups based on traffic conditions and interference levels. This dynamic approach allows flexible resource sharing while maintaining performance by adapting to changing system conditions through coordinated switching patterns.
Solution Approach 2:
The method changes the allocation parameters of radio resources by switching between different groups (first group with certain frequency resources and second group with different frequency resources). This parameter change enables the system to adapt to varying traffic loads while controlling interference through structured group switching.
3Reliability
If inter-cell interference coordination is implemented to improve SIR and cell-edge data rates, then resource management becomes more complex requiring extensive inter-communication between cells
Solution Approach 1:
The radio resources are pre-divided into multiple groups before deployment, and the switching patterns between groups are predetermined. This preliminary structuring allows interference coordination to be achieved through simple group switching rather than complex real-time coordination, reducing inter-node communication requirements while maintaining SIR improvement.
Data Source
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Figure 7A~7B
AI summary
A cellular communication system comprising a plurality of user equipment and a network infrastructure. Radio resource of the plurality of cells is divided into more than one radio resource groups. A network infrastructure element detects a requirement of radio resource allocation for a user equipment and determines effective interference to be generated by the required radio resource to a defined group of neighbouring cells. User equipment is allocated a radio resource from one of the radio resource groups on the basis of the determined effective interference to be generated to the defined group of neighbouring cells. Inter-cell interference decreases and the throughput of the cellular system increases, but the exchange of physical layer information is not increased.