Downlink Control Region Configuration via Last CCE Index
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Solution Overview
Problem
Current wireless communication systems face challenges in efficiently configuring DownLink (DL) control regions, particularly in reducing latency and optimizing resource utilization for shortened Transmission Time Intervals (TTIs), which affects data throughput and control overhead.
Innovation Solution
A method for configuring a DL control region by determining a last Control Channel Element (CCE) index based on received Downlink Control Information (DCI), allocating resources for Downlink control channel candidates, and utilizing unused resources for Downlink data channel transmission, ensuring consistent starting positions and centers of control channel transmission regions across aggregation levels.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the control region is configured to support multiple aggregation levels with flexible resource allocation, then the adaptability and versatility of the system is improved, but the device complexity increases due to the need to manage multiple CCE indices and resource regions
Solution Approach 1:
The control region is segmented into multiple candidate regions, each associated with a specific aggregation level. The DCI message includes a last CCE index that indicates which segmented region should be used for control channel transmission. This segmentation allows the system to support multiple aggregation levels while simplifying the configuration management by dividing the control region into manageable segments rather than managing the entire region as a single complex structure.
2Productivity
If unused resources in the control region are allocated for data channel transmission, then the productivity and data throughput are improved, but the reliability may be affected due to potential interference between control and data channels
Solution Approach 1:
The control region is divided into multiple candidate regions, each associated with a specific aggregation level. By indicating the last CCE index in the DCI message, the system precisely defines which segmented region is used for control channel transmission. This segmentation enables the data channel to use only the remaining resources outside the indicated control region, ensuring clear separation between control and data channels. This approach maximizes resource utilization for data transmission while maintaining control channel reliability through precise boundary definition.
3Ease of operation
If the starting position and center of control channel transmission region are kept consistent across aggregation levels, then the ease of operation and system performance consistency are improved, but the adaptability to different aggregation level requirements is reduced
Solution Approach 1:
The control region is segmented into multiple candidate regions, each associated with a specific aggregation level. The DCI message includes a last CCE index that indicates which segmented region should be used. This segmentation allows the system to maintain consistent starting positions and centers across aggregation levels (improving ease of operation) while still providing adaptability by selecting different segments based on the indicated index (maintaining flexibility for different aggregation level requirements).
Solution Approach 2:
Different segments of the control region are assigned different characteristics based on their association with specific aggregation levels. Each segment has its own last CCE index and resource region configuration optimized for its intended aggregation level. This local quality approach allows the system to maintain overall consistency in positioning while providing localized adaptations for different aggregation level requirements, resolving the contradiction between consistency and flexibility.
Data Source
AI summary
A method for receiving a downlink control channel by a user equipment (UE) in a wireless communication system is disclosed. The method includes receiving downlink control information (DCI) indicating an aggregation level being a reference for allocating a downlink data channel to a control region, determining a last control channel element (CCE) index to which the downlink control channel is allocated, based on the received DCI, configuring a downlink control channel transmission region in consideration of the last CCE index and a resource region for one or more downlink control channel candidates corresponding to the aggregation level, and configuring a remaining control region except for the downlink control channel transmission region as a downlink data channel transmission region, and receiving the downlink control channel and the downlink data channel in the control region, based on the configured downlink control channel transmission region and the configured downlink data channel transmission region.