Dynamic Channel Power Allocation in Cellular Networks
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Solution Overview
Problem
The Fractional Frequency Reuse (FFR) scheme in multi-cell communication systems is unable to adapt to changes in user distribution and the number of users in each cell, leading to degraded system performance and inefficient power control.
Innovation Solution
Each Base Station (BS) generates and exchanges inter-cell cooperation information based on channel state information with neighboring BSs to dynamically allocate channels and power, minimizing interference and optimizing frequency efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If FFR scheme is used to control frequency reuse rate for each subchannel, then frequency efficiency is improved, but system performance degrades when user distribution changes
Solution Approach 1:
The patent makes the frequency reuse pattern dynamic by allowing base stations to exchange inter-cell cooperation information and adjust resource allocation in real-time based on current network state, user distribution, and channel conditions, rather than using a fixed pattern determined during cell planning
Solution Approach 2:
The patent implements feedback mechanisms where base stations continuously exchange information about channel state, user distribution, and interference conditions, enabling adaptive adjustment of frequency reuse patterns and power allocation to maintain optimal system performance
2Productivity
If frequency resources are reused in multiple cells, then frequency efficiency is improved, but inter-cell interference increases
Solution Approach 1:
The patent applies different frequency reuse factors to different subchannels and different cells based on local conditions such as user distribution and channel state, allowing aggressive frequency reuse in areas with low interference and conservative reuse in areas with high interference
Solution Approach 2:
The patent dynamically changes frequency reuse parameters and power allocation parameters based on real-time network conditions, adjusting the frequency reuse factor for different subchannels and cells to optimize the trade-off between frequency efficiency and inter-cell interference
3Productivity
If frequency reuse factor is set to 1 for some subchannels, then frequency efficiency is maximized, but ICI becomes larger
Solution Approach 1:
The patent assigns different frequency reuse factors (1 or greater than 1) to different subchannels based on local interference conditions and user distribution patterns, allowing maximum frequency efficiency on subchannels with low interference and reduced interference on subchannels with high interference
Data Source
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AI summary
An apparatus and method for allocating a channel and power by a Base Station (BS) in a communication system are provided. The method includes, performing one of a first scheduling, which uses inter-cell cooperation information received from at least one neighboring BS and a data rate received from each User Equipment (UE), and a second scheduling, which uses both an average data rate for each subchannel computed by accumulating the data rates for a preset time period and the inter-cell cooperation information, selecting a UE to be allocated each subchannel in each subframe based on results of the performed scheduling, computing a power metric for each of the selected UE and a non-selected UE by using the inter-cell cooperation information, the average data rate, an amount of performance change of the selected UE, and the results of the performed scheduling; and allocating power to all UEs including the selected UE and the non-selected UE by preset subframe periods by using the computed power metric.