Downlink Control Channel Blind Detection Configuration for MTC Terminals
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Solution Overview
Problem
Existing LTE/LTE-A systems face challenges in accurately receiving and detecting downlink control channels by MTC terminals, especially in scenarios with limited radio frequency reception bandwidth and varying coverage conditions, leading to decreased performance and data transmission reliability.
Innovation Solution
A transmission method that configures detection parameters for downlink control channels through high-level signaling, limiting blind detection paths by determining the maximum number of candidates and repeat times, and allocating candidates across aggregation levels and repeat times to ensure accurate transmission and reception, even in bandwidth-limited and coverage-enhanced scenarios.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If MTC terminals perform blind detection of downlink control channels in each subframe with multiple aggregation levels, then the terminal can receive scheduling information, but the detection complexity and time consumption increase significantly
Solution Approach 1:
The patent applies preliminary action by pre-configuring detection parameters including maximum candidate numbers and repeat time sets through high-level signaling before the terminal performs blind detection. This allows the terminal to limit its detection scope to pre-defined candidates across multiple aggregation levels and repeat times, significantly reducing detection complexity and time consumption while maintaining reliable reception of downlink control channels
2Reliability
If the terminal detects downlink control channels across multiple repeat times with different aggregation levels, then coverage is enhanced, but the device complexity and detection overhead increase
Solution Approach 1:
The patent applies segmentation by dividing the detection process into multiple independent repeat times, each with specific aggregation levels and candidate numbers. The terminal detects downlink control channels across different repeat times (e.g., first repeat time with aggregation level 4, second repeat time with aggregation level 8) rather than attempting to detect all candidates simultaneously. This segmented approach enhances coverage performance while managing detection complexity through time-domain separation
Solution Approach 2:
The patent applies dynamics by configuring different maximum candidate numbers for different aggregation levels and repeat times through high-level signaling. The detection parameters are not fixed but dynamically adjusted based on the specific repeat time and aggregation level being detected. This dynamic configuration allows the system to optimize coverage performance while controlling detection complexity adaptively across different transmission conditions
3Ease of operation
If the terminal limits blind detection to a fixed maximum number of candidates per subframe, then detection complexity is reduced, but the ability to adapt to varying coverage conditions is limited
Solution Approach 1:
The patent applies dynamics by configuring different maximum candidate numbers for different aggregation levels and repeat times through high-level signaling. The detection parameters are not fixed but dynamically adjusted based on the specific repeat time and aggregation level being detected. This dynamic configuration allows the system to optimize coverage performance while controlling detection complexity adaptively across different transmission conditions
Solution Approach 2:
The patent applies parameter changes by modifying the maximum candidate number parameter based on aggregation level and repeat time. Instead of using a single fixed maximum candidate number for all detections, the system configures specific maximum candidate numbers for each combination of aggregation level and repeat time (e.g., first maximum candidate number for first aggregation level, second maximum candidate number for second aggregation level). This parameter adaptation enables the terminal to maintain simple detection operations while effectively adapting to varying coverage conditions through differentiated configuration
Data Source
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AI summary
A transmission method and a configuration method for a downlink control channel, a terminal, a base station and a computer storage medium are provided. The transmission method for the downlink control channel includes: performing, by a terminal, a blind detection on the downlink control channel according to a maximum number (Ntotal) of candidates in a repeated transmission. The N_total meets one of the following conditions: the N_total is not greater than a total number N_legacy of candidates of a single subframe of a transmission terminal (legacy UE) of a long-term evolution (LTE) system; the N_total is N_legacy×Y which is a product of the N_legacy and a maximum value Y of types of repeat times for performing the blind detection on the downlink control channel; and the N_total ranges from the N_legacy to the N_legacy×Y.