Radio Base Station Channel Allocation Using Positional Data
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Solution Overview
Problem
Radio communication systems using adaptive modulation and OFDMA schemes face issues with communication quality deterioration in areas affected by interference or obstacles, leading to suboptimal channel allocation.
Innovation Solution
A radio base station equipped with a communication quality detector, positional information acquisition unit, channel information storage, and a channel allocator that calculates differences in positional information to allocate communication channels based on predetermined quality thresholds, ensuring optimal channel allocation and minimizing quality degradation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a radio base station allocates communication channels based on measured communication quality without considering terminal position, then communication quality can be optimized for specific areas, but communication quality deteriorates for terminals moving into areas with poor channel conditions
Solution Approach 1:
The channel allocation system dynamically adjusts based on terminal position changes. The base station continuously acquires terminal position information and recalculates suitable channels according to the terminal's current location, transforming the static allocation system into a dynamic one that adapts to moving terminals.
Solution Approach 2:
The base station pre-measures and stores communication quality information for multiple communication channels in advance. When a terminal needs channel allocation, the system retrieves pre-measured data and calculates suitable channels based on terminal position, avoiding the need for real-time measurement while maintaining accuracy.
2Measurement precision
If the radio base station measures communication quality for each subcarrier and stores it in association with positional information, then channel allocation precision is improved, but system complexity increases
Solution Approach 1:
The base station performs communication quality measurements for each subcarrier in advance and stores the results in association with positional information. This preliminary measurement approach allows the system to retrieve pre-computed data during actual channel allocation, reducing real-time computational complexity while maintaining high measurement precision.
Solution Approach 2:
The system divides the communication spectrum into multiple subcarriers and measures communication quality for each subcarrier independently. By segmenting the measurement process and storing results separately, the system can efficiently retrieve and apply specific subcarrier information without processing the entire spectrum, reducing overall system complexity.
Data Source
AI summary
A radio base station includes: a communication quality detector (183) configured to detect communication quality in a subcarrier; a positional information acquisition unit (182) configured to acquire positional information indicating a position of a radio communication terminal at a time point when the communication quality is detected by the communication quality detector; subcarrier information table storage (185) configured to store a subcarrier information table including a subcarrier number, the communication quality, and the positional information, in association with one another; current positional information acquisition unit (180) configured to acquire current positional information indicating a current position of the radio communication terminal; and allocator (189) configured to allocate the communication channel to the radio communication terminal on the basis of the subcarrier information table and of the current positional information.