EPDCCH Detection Adaptation for Wireless Reliability
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Solution Overview
Problem
In wireless communication systems, particularly in LTE, there is a challenge in effectively detecting downlink control information due to variations in resource elements and aggregation levels, which affects the complexity and efficiency of EPDCCH detection.
Innovation Solution
A method is introduced to dynamically adjust the number of EPDCCH candidates based on aggregation level-related information, including DCI format type, system bandwidth, and resource elements available, and to monitor EPDCCH search spaces across different aggregation levels, allowing for efficient detection of downlink control information.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the number of EPDCCH candidates is increased to improve detection reliability, then the detection reliability is improved, but the device complexity increases
Solution Approach 1:
The patent applies dynamics by making the number of EPDCCH candidates adjustable rather than fixed. The network can dynamically configure the number of candidates based on channel conditions, traffic requirements, and resource availability, allowing the system to adapt between reliability and complexity requirements in different scenarios
Solution Approach 2:
The patent changes the parameter of the number of EPDCCH candidates from a fixed value to a configurable parameter. By introducing aggregation level-related information and allowing flexible configuration of candidate numbers at different aggregation levels, the system can optimize detection reliability while controlling complexity through parameter adjustment
2Reliability
If the number of EPDCCH candidates is increased to improve detection coverage, then the detection coverage is improved, but the processing time increases
Solution Approach 1:
The patent segments the EPDCCH detection process by dividing candidates into different aggregation levels (AL1, AL2, AL4, AL8, etc.). The UE can perform blind decoding in a structured manner across different aggregation levels, allowing efficient search space management and reducing overall processing time while maintaining comprehensive detection coverage
3Reliability
If the aggregation level is increased to improve detection robustness, then the detection robustness is improved, but the resource consumption increases
Solution Approach 1:
The patent applies local quality by assigning different aggregation levels to different EPDCCH candidates based on local channel conditions and detection requirements. Not all candidates use the same aggregation level - instead, the system selectively applies higher aggregation levels where needed to improve robustness while using lower aggregation levels elsewhere to conserve resources
Data Source
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AI summary
The present invention relates to a method of detecting down-link control information by a terminal in a wireless communication system. More particularly, the present invention includes: receiving aggregation level related information for monitoring an enhanced physical downlink control channel (EPDCCH); and monitoring a search area for the EPDCCH according to a specific aggregation level to detect down-link control information, wherein for the specific aggregation level, the number of EPDCCH candidates for detecting the down-link control information is differently defined according to the aggregation level related information.