Subcarrier Allocation for Wireless Communication Efficiency
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Solution Overview
Problem
Current wireless communication systems face challenges in achieving high transmission efficiency, low power consumption, and high-speed signal processing due to the large amount of control information and signal processing required for adaptive modulation and scheduling across all subcarriers, which results in increased power consumption and processing complexity.
Innovation Solution
The system allocates first data to subcarriers selected based on reception quality and required transmission rate using scheduling, while allocating second data to preassigned subcarriers, reducing the need for frequent CQI reporting and simplifying signal processing, thereby improving transmission efficiency and reducing power consumption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If adaptive modulation and scheduling is performed for every subcarrier, then frequency utilization efficiency is improved, but the amount of control information increases and transmission rate falls
Solution Approach 1:
The patent segments subcarriers into two categories: scheduled subcarriers (first subcarrier group) where adaptive modulation and scheduling is performed, and fixed subcarriers (second subcarrier group) where data is allocated without scheduling. This segmentation allows the system to apply complex processing only where necessary while reducing control overhead for other subcarriers, thus resolving the contradiction between frequency utilization efficiency and control information quantity.
2Productivity
If CQI measurement and scheduling processing is performed for every subcarrier, then transmission efficiency is improved, but signal processing complexity and power consumption increase
Solution Approach 1:
The patent divides subcarriers into first and second groups, applying different processing strategies. For first subcarriers, full CQI measurement and scheduling processing is performed to maximize transmission efficiency. For second subcarriers, data is allocated to preassigned subcarriers without requiring CQI measurement or scheduling processing, thereby reducing signal processing complexity and power consumption while maintaining overall transmission efficiency.
3Manufacturing precision
If scheduling is performed for every subcarrier, then data allocation optimality is improved, but processing speed decreases
Solution Approach 1:
The patent segments subcarriers into scheduled and fixed groups. Data allocation optimality is achieved for first subcarriers through scheduling based on CQI, while second subcarriers use preassigned allocation that requires no processing. This segmentation enables the system to achieve optimal data allocation where needed while maintaining high processing speed through simplified allocation for other subcarriers.
Data Source
AI summary
Wireless communication apparatus capable of increasing transmission efficiency by selecting data for scheduling according to data type, and capable of achieving low power consumption and high-speed signal processing is disclosed. With this apparatus, a control section (108) allocates transmission data sequence 1 to subcarriers of superior quality by carrying out scheduling for the transmission data sequence 1 based on CQI sent from communication terminal apparatus and required transmission rate information for each communication terminal apparatus, and allocates transmission data sequence 2 to preassigned subcarriers. Channel allocation section (115) allocates data for transmission data sequence 1 to subcarriers designated by control section (108). Channel allocation section (116) allocates data for transmission data sequence 2 to subcarriers designated by control section (108).