Base Station Control Channel Segmentation for Resource Allocation
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Solution Overview
Problem
Conventional communication systems face challenges in efficiently transmitting control channels to terminals with varying bandwidths and channel conditions, leading to suboptimal resource use and reception quality, especially when adaptive modulation and coding are employed.
Innovation Solution
A base station with a management unit for allocating frequency blocks based on terminal bandwidths, a frequency scheduler for generating scheduling information, and a multiplexing unit for frequency-multiplexing control channels, along with a coding and modulation unit for encoding general and specific control channels, enables efficient transmission using a multicarrier scheme.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If control channels are distributed to all resource blocks, then all terminals can receive the control channel with certain reception quality, but it becomes difficult to further improve the reception quality
Solution Approach 1:
The control channel is segmented into two distinct parts: a common control channel transmitted on a specific resource block for all terminals, and user-specific control channels transmitted on resource blocks allocated to individual terminals. This segmentation allows different transmission strategies for different parts of the control information, improving overall reception quality while maintaining flexibility.
Solution Approach 2:
Different parts of the control channel are transmitted with different qualities and strategies. The common control channel uses a fixed resource block with robust transmission for all terminals, while user-specific control channels use resource blocks allocated to individual terminals with transmission parameters optimized for each user's channel conditions, achieving local optimization of reception quality.
2Productivity
If a variable format is used to accommodate varying amounts of control information, then resource use efficiency is improved, but signal processing workload increases
Solution Approach 1:
The control information is segmented into a common part with fixed format and user-specific parts with variable format. The common control channel uses a predetermined fixed format that simplifies processing, while user-specific control channels use variable formats optimized for each user's needs, balancing efficiency and complexity.
Solution Approach 2:
The control channel format transitions from a completely fixed structure to a dynamic hybrid structure where the common part remains fixed for simplicity while the user-specific part becomes dynamic and adaptable to varying information requirements, optimizing resource efficiency without overwhelming processing demands.
3Loss of energy
If a fixed format is used for control channels, then resource wastage is avoided, but the ability to accommodate varying amounts of control information is limited
Solution Approach 1:
The control channel is divided into a common fixed-format portion that prevents resource wastage and user-specific variable-format portions that accommodate varying information needs. This segmentation allows the system to avoid allocating resources for unnecessary control information while still providing the flexibility to transmit variable amounts of user-specific control data.
Solution Approach 2:
The common control channel uses a universal fixed format that can serve all terminals efficiently without resource wastage, while the user-specific control channels provide multi-functionality to handle varying amounts of control information differentially for each terminal, combining the benefits of both fixed and variable formats.
4Productivity
If resource blocks are allocated preferentially to terminals with good channel conditions, then transmission efficiency is improved, but terminals with poor channel conditions cannot receive control channels with good quality
Solution Approach 1:
The control channel transmission is segmented into a common control channel that ensures minimum quality for all terminals regardless of channel conditions, and user-specific control channels that can be optimized for terminals with good channel conditions. This segmentation allows the system to maintain reliability for all users while improving transmission efficiency for users with better channels.
Solution Approach 2:
Different quality levels are applied locally to different parts of the control channel transmission. The common control channel maintains a baseline quality suitable for all terminals, while user-specific control channels allocated to terminals with good channel conditions can use higher order modulation and coding schemes to achieve higher transmission efficiency, optimizing overall system performance.
Data Source
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AI summary
A disclosed base station includes a management unit for managing frequency blocks, a scheduler for generating scheduling information for each of the frequency blocks to allocate one or more resource blocks to each of selected communication terminals having good channel conditions, a channel generating unit for generating control channels including the scheduling information for the respective frequency blocks, a multiplexing unit for frequency-multiplexing the control channels in a system frequency band, and a transmitting unit for transmitting the frequency-multiplexed control channels according to a multicarrier scheme. The control channels transmitted by the base station includes a general control channel to be decoded by communication terminals in general and specific control channels to be decoded by selected communication terminals that are allocated one or more resource blocks.