Base Station Control Channel Multiplexing for Varying Bandwidths
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Solution Overview
Problem
In next-generation radio access systems, existing technologies face challenges in efficiently allocating and transmitting control channels across terminals with varying usable bandwidths, leading to suboptimal frequency use and throughput, especially when channel quality varies and multiple antennas are involved.
Innovation Solution
A base station performs frequency scheduling and multiplexes control channels with other channels, adjusting transmission power to effectively transmit scheduling information across terminals with different bandwidths, using frequency-division multiplexing to increase coverage and resource utilization.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If frequency scheduling is performed to allocate resource blocks to terminals with good channel quality, then transmission efficiency and throughput are improved, but the complexity of control channel transmission increases when terminals have varying usable bandwidths
Solution Approach 1:
The frequency band is divided into multiple resource blocks, and the control channel is segmented and transmitted in each resource block. This allows terminals with different bandwidth capabilities to receive control information from the resource blocks that fall within their usable bandwidth, reducing the complexity of control channel transmission while maintaining frequency scheduling efficiency.
Solution Approach 2:
Different control channel transmission strategies are applied to different resource blocks based on terminal-specific channel quality and bandwidth capabilities. The base station transmits control information in a distributed manner across multiple resource blocks, with each terminal receiving control information from the resource blocks it can access, optimizing transmission efficiency for each terminal's local conditions.
2Ease of manufacture
If control channel is transmitted in fixed resource blocks, then transmission simplicity is maintained, but frequency use efficiency decreases when terminals have varying usable bandwidths
Solution Approach 1:
The control channel transmission is made dynamic by distributing control information across multiple resource blocks rather than using fixed allocation. The base station dynamically determines which resource blocks contain control information based on terminal bandwidth capabilities and channel conditions, allowing flexible adaptation to varying terminal requirements while maintaining transmission simplicity through standardized control information formats.
3Area of stationary object
If distributed control channel transmission is used to increase coverage area, then frequency use efficiency is improved, but the difficulty of detecting and measuring control information increases
Solution Approach 1:
The system employs feedback mechanisms where terminals report their usable bandwidth and channel quality information to the base station. Based on this feedback, the base station optimizes the distribution of control information across resource blocks, ensuring that control information is transmitted in resource blocks that terminals can effectively detect and measure while maximizing coverage area.
Data Source
AI summary
A communication terminal in a multi-carrier system using a frequency bandwidth including a plurality of resource blocks, each of the resource blocks including one or more sub-carriers. The communication terminal includes a receiving unit configured to receive a signal in which a control channel is multiplexed into a single radio frame based on a number of control channels allocated into the single radio frame to use a lower coding rate by repeating transmitting without changing encoding method in which a channel other than the control channel is multiplexed in accordance with scheduling information for allocating one or more of the plurality of resource blocks to the communication terminal and a processing unit configured to perform a process on the signal received by the receiving unit.