Downlink Control Channel Frequency Reuse via Symbol Segmentation
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Solution Overview
Problem
Facilitating frequency reuse for downlink control channels in wireless communication systems is challenging, particularly in LTE systems, due to the difficulty in achieving effective frequency reuse for DL control channels compared to data transmissions.
Innovation Solution
The method involves determining a minimum number of symbols for supporting control information transmission on a downlink control channel and configuring a greater number of symbols, thereby increasing the number of downlink control channels to achieve frequency reuse, and allocating cells to fractions of bandwidth coordinated across cells to provide frequency reuse of bandwidth.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If the number of symbols for downlink control channel transmission is increased, then the number of downlink control channels is increased, but the complexity of frequency reuse configuration is increased
Solution Approach 1:
The patent segments the downlink control channel transmission by dividing the available symbols into different sets (first set and second set of symbols). The first set of symbols is used for transmitting control information in a first set of downlink control channels, while the second set of symbols is used for transmitting control information in a second set of downlink control channels. This segmentation enables frequency reuse by allowing different cells to use different symbol sets for control channel transmission, thereby increasing the number of available control channels without requiring complete reconfiguration of all channels.
2Reliability
If frequency reuse is implemented for downlink control channels, then cell edge coverage is improved, but the difficulty of achieving effective frequency reuse is increased
Solution Approach 1:
The patent employs feedback mechanisms where user equipment (UE) provides channel quality information (CQI) feedback to the base station. This feedback is used to determine the appropriate number of symbols and control channels to configure for frequency reuse. The base station uses this feedback to dynamically adjust the control channel configuration, making the frequency reuse process more manageable and effective, thereby improving cell edge coverage without excessive complexity.
3Productivity
If the number of symbols for control information transmission is increased, then total cell throughput is improved, but the resource allocation complexity is increased
Solution Approach 1:
The patent implements dynamic resource allocation by allowing the base station to flexibly configure the number of symbols and control channels based on real-time channel conditions and traffic demands. The system can dynamically switch between different symbol sets (first set and second set) and adjust the allocation of control channels to optimize throughput. This dynamic approach enables the system to achieve higher total cell throughput while managing resource allocation complexity through adaptive rather than static configuration.
Data Source
AI summary
Systems and methods for frequency reuse on downlink control channels (DLCCs) are provided. One method can include determining a first number of symbols to support transmission of control information on a DLCC, and configuring a second number of symbols for transmission of the control information on the DLCC, wherein the second number of symbols is greater than the first number of symbols. The method can also include assigning a number of DLCCs based on the second number of symbols, and transmitting control information over an assigned number of DLCCs to achieve an effective reuse factor less than one. Another method can include identifying fractions of bandwidth in a system having cells, and allocating at least one of the cells to at least one of the fractions of bandwidth in a system. Resource element groups allocated to the fractions of bandwidth can be coordinated across cells to provide frequency reuse.