Transmission Power Range Assignment for Interference Balancing
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Solution Overview
Problem
In wireless communication systems, non-power controlled systems face challenges with inaccurate Dynamic Channel Assignment (DCA) and Adaptive Modulation and Coding (AMC) due to fast fading and intercell interference fluctuations, leading to reduced data rates and increased transmission delays, especially for mobile stations in low geometry.
Innovation Solution
The method involves grouping subcarrier blocks into sets and assigning transmission power ranges to these sets across radio cells, allowing for controlled transmission power levels within defined ranges to balance interference and improve SIR estimation accuracy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If dynamic channel assignment is performed without power control, then system complexity is reduced, but interference fluctuations increase and measurement precision deteriorates
Solution Approach 1:
The patent segments the subcarrier blocks into different sets and assigns different transmission power ranges to each set. This segmentation allows the system to control interference levels in different frequency regions independently, thereby improving measurement precision without requiring complete power control across all resources, thus avoiding full system complexity.
Solution Approach 2:
The patent applies local quality by assigning specific transmission power ranges to specific subcarrier block sets based on their interference characteristics. Different subcarrier blocks receive different power control treatments according to their local interference environment, enabling precise interference management without uniform power control throughout the entire system.
2Ease of operation
If transmission power is not controlled, then ease of operation is improved, but data rates decrease and reliability worsens
Solution Approach 1:
The patent introduces dynamic power control by assigning different transmission power ranges to different subcarrier block sets based on instantaneous channel conditions and interference levels. This dynamic adjustment improves data rate reliability without requiring manual intervention, maintaining ease of operation while enhancing system performance.
Solution Approach 2:
The patent changes the transmission power parameter dynamically by selecting from predefined power ranges associated with different subcarrier block sets. This parameter adjustment optimizes the balance between ease of operation and data rate reliability by automatically adapting to changing channel conditions.
3Device complexity
If subcarrier blocks are assigned without considering interference distribution, then device complexity is reduced, but harmful factors increase
Solution Approach 1:
The patent segments subcarrier blocks into sets and assigns them to different transmission power ranges, enabling differentiated interference management. This segmentation allows the system to reduce harmful intercell interference in critical regions without requiring complex global optimization algorithms, thus maintaining acceptable device complexity.
Solution Approach 2:
The patent converts the potentially harmful effect of intercell interference into a beneficial control mechanism by using interference measurements to determine which subcarrier blocks should be assigned to which power ranges. This transforms interference from a problematic factor into a guiding principle for resource allocation.
Data Source
AI summary
The present invention relates to a method for balancing the distribution of interference between radio cells in a wireless communication system comprising cells in which subcarrier blocks are used for communication. A number of adjacent cells build a cell cluster. Moreover, the present invention relates to a corresponding method adapted for use in a system in which multi beam antennas or multiple antennas are used. Furthermore, the present invention relates to base stations performing the above method as well as a communication system comprising the base stations. To reduce the large average SIR variations without causing additional SIR estimation, measurement and calculation problem as introduced with power control the invention suggests to group subcarrier blocks into a plurality of subcarrier block sets in each cell of a cell cluster, to determine transmission power ranges for each of the cells of said cell cluster, and to assign transmission power ranges to the subcarrier block sets to perform TPC within the ranges.