Hierarchical Cellular Resource Allocation via Usage Plan Reporting
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Solution Overview
Problem
In hierarchical cellular systems, interference between small cells and macrocells using the same frequency resource limits frequency efficiency and communication reliability, and existing methods to manage interference increase network overhead.
Innovation Solution
A method that dynamically allocates macrocell dedicated resources and shared resources based on usage rates, where the macrocell reports its usage plan to the small cell, allowing the small cell to allocate unused resources to terminals with high mobility and used resources to those with low mobility, using schemes like transmission power control and multi-antenna transmission to mitigate interference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the macrocell and small cell use the same frequency resource, then frequency efficiency is improved, but interference between transmission/reception pairs increases
Solution Approach 1:
The patent segments the frequency resource into macrocell dedicated resources and shared resources. The shared resources are further segmented into time slots or resource blocks where the macrocell and small cell take turns using the same frequency, thereby reducing interference while maintaining frequency efficiency.
Solution Approach 2:
The patent dynamically allocates shared resources based on real-time channel conditions and usage rates. The macrocell reports its usage plan for shared resources, and the small cell adjusts its allocation accordingly. This dynamic adaptation allows the system to optimize frequency efficiency while managing interference through flexible resource assignment.
2Object-affected harmful factors
If interference is continuously shared and updated between small cell and macrocell, then interference is reduced, but network overhead increases
Solution Approach 1:
The macrocell reports its usage plan for shared resources in advance before actually using them. This preliminary action allows the small cell to prepare its own resource allocation strategy beforehand, reducing the need for continuous real-time updates and thereby lowering network overhead while still effectively managing interference.
Solution Approach 2:
The system implements a feedback mechanism where the macrocell reports its shared resource usage plan to the small cell, which then adjusts its resource allocation accordingly. This selective feedback approach, triggered by specific events or time intervals rather than continuously, reduces overhead while maintaining effective interference management.
3Reliability
If shared resource is allocated to terminals with high mobility, then communication reliability is improved, but frequency efficiency decreases
Solution Approach 1:
The patent applies different allocation strategies to different types of terminals based on their mobility characteristics. High-mobility terminals are prioritized for shared resources that offer better reliability, while low-mobility terminals are allocated from the macrocell dedicated resources to maintain frequency efficiency. This localized differentiation optimizes both reliability and efficiency simultaneously.
Data Source
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AI summary
Described herein is a resource allocation method for a hierarchical cellular system, and a transmission frame for performing the method. A macrocell dedicated resource and a shared resource are respectively controlled based on a usage rate of the macrocell dedicated resource and a usage rate of the shared resource. The macrocell reports a usage plan of the shared resource that the macrocell uses to a small cell, and the small cell may allocate the shared resource to terminals based on the usage plan of the shared resource. A control message related to the usage plan may be transmitted/received via the transmission frame.