Base Station Frequency Layer Channel Allocation
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Solution Overview
Problem
Current mobile communication systems face challenges in providing high data transmission speeds and large cell coverage areas, especially for IMT-Advanced services, due to difficulties in securing continuous wide frequency bands and managing radio propagation issues in high-frequency bands.
Innovation Solution
Assigning downlink cell common control and traffic channels to a low-frequency band while adaptively assigning dedicated control and traffic channels to low or high-frequency layers based on radio propagation status and communication requirements, optimizing channel allocation for improved reliability and data transmission efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If high-frequency bands are used to secure wide continuous frequency bands, then data transmission speed is improved, but radio propagation attenuation increases and cell coverage area decreases
Solution Approach 1:
The patent divides the frequency spectrum into multiple frequency layers (first frequency layer with lower frequency and second frequency layer with higher frequency). Different types of channels are assigned to different frequency layers based on their requirements, allowing the system to segment the frequency resources to optimize both coverage and data rate
Solution Approach 2:
The patent applies different frequency layers to different channels based on their specific requirements. Cell common control channels and cell common traffic channels are assigned to the first frequency layer with better propagation characteristics, while cell dedicated channels are assigned to the second frequency layer for higher data rates. This local optimization of frequency allocation resolves the contradiction between coverage and speed
2Productivity
If a single carrier secures a continuous 100 MHz band for IMT-Advanced, then data transmission capability is improved, but frequency band availability and system flexibility deteriorate
Solution Approach 1:
The patent creates a multi-functional frequency allocation system where the first frequency layer serves as a common resource for all users (providing coverage and basic services), while the second frequency layer provides enhanced data rates for users with good channel conditions. This universal structure allows flexible adaptation to different service requirements and user conditions
Solution Approach 2:
The patent implements dynamic channel allocation where cell dedicated control channels and cell dedicated traffic channels are adaptively assigned to different frequency layers based on downlink channel status and communication requirements. This dynamic adjustment allows the system to optimize performance in real-time while maintaining flexibility in frequency band utilization
3Ease of manufacture
If existing base station locations are used for IMT-Advanced services, then deployment cost is reduced, but support for high data rates and large cell coverage areas deteriorates
Solution Approach 1:
The patent changes the frequency parameter allocation at existing base stations, introducing a two-layer frequency structure. The first frequency layer maintains compatibility with existing deployments for coverage, while the second frequency layer enables high data rates. This parameter change allows existing infrastructure to support advanced services without physical modifications
Data Source
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AI summary
Utilizing a frequency-bandwidth limited IMT frequency band of 3GHz, requirements of IMT-Advanced; that is, 100 Mbps for high speed movement and 1 Gbps for low speed movement in the downlink are satisfied. A communication system performs radio communication between a base station apparatus 40a and a mobile station apparatus 50 using a plurality of frequency layers having frequency bands different from each other, wherein the base station apparatus 40a assigns a downlink cell common control channel and a downlink cell common traffic channel to a low-frequency layer, and assigns a downlink cell dedicated control channel and a downlink cell dedicated traffic channel to a low-frequency layer and/or a high-frequency layer according to a downlink channel status and a communication requirement of the mobile station apparatus 50.