Downlink Control Information Decoding via Segmented Aggregation Levels
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Solution Overview
Problem
In wireless communication systems, the existing methods for transmitting and receiving downlink control information (DCI) face challenges in efficiently decoding DCI, especially in systems with short transmission time intervals (TTIs), leading to increased latency and decoding overhead due to frequent blind decoding attempts and aggregation levels.
Innovation Solution
A method is proposed that divides DCI into two levels: 'slow' DCI transmitted via the PDCCH and 'fast' DCI via the sPDCCH, where the base station indicates a reduced number of aggregation levels and blind decoding attempts to the UE, thereby reducing the decoding overhead and latency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If frequent blind decoding attempts are performed to ensure reliable DCI reception, then reception reliability is improved, but decoding time and processing overhead increase
Solution Approach 1:
The patent segments the DCI reception process into two stages: a first stage using conventional PDCCH with multiple aggregation levels for initial decoding attempts, and a second stage using sPDCCH with reduced aggregation levels for additional decoding. This segmentation allows the system to maintain high reliability through multiple attempts while reducing overall decoding time by optimizing the second stage with fewer, more targeted blind decoding attempts based on feedback from the first stage.
2Reliability
If multiple aggregation levels are used for DCI transmission, then reception reliability is improved, but device complexity and processing overhead increase
Solution Approach 1:
The patent applies dynamics by making the number of aggregation levels adjustable rather than fixed. The base station dynamically determines the number of aggregation levels to use in the second DCI transmission stage based on the results of blind decoding attempts in the first stage. This dynamic adjustment allows the system to maintain reliability when needed while reducing complexity when fewer attempts are required, optimizing the balance between these two parameters.
3Productivity
If the number of blind decoding attempts is reduced, then decoding overhead is reduced, but reception reliability may deteriorate
Solution Approach 1:
The patent implements feedback by using the results of blind decoding attempts in the first DCI transmission stage to determine the number of aggregation levels for the second transmission stage. The base station receives feedback information about which aggregation levels were successful or failed, and uses this feedback to dynamically adjust the second stage configuration. This feedback mechanism ensures that reliability is maintained while reducing overall decoding overhead by focusing subsequent attempts on the most promising aggregation levels.
Data Source
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AI summary
A method for transmitting and receiving downlink control information (DCI) in a wireless communication system and a device therefor are disclosed.. Specifically, a method for receiving, by a user equipment, downlink control information in the wireless communication system includes receiving, from a base station, first DCI via a first downlink control channel based on a first transmission time interval (TTI), wherein the first DCI includes control channel information representing at least one aggregation level related to a reception of second DCI among a plurality of predetermined aggregation levels, and receiving, from the base station, the second DCI via a second downlink control channel based on a second TTI using the control channel information.