EPDCCH Resource Allocation and Blind Decoding Optimization
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Solution Overview
Problem
The existing enhanced physical downlink control channel (EPDCCH) in LTE systems faces inefficiencies in resource usage, leading to high blocking probabilities due to fixed and insufficient resource allocation, which limits system capacity and flexibility in advanced network deployments.
Innovation Solution
A method is introduced to calculate the average number of available resource elements in control channel elements, select an optimal aggregation level, and determine the corresponding number of blind decoding candidates to efficiently transmit control information, ensuring efficient resource utilization and low blocking probabilities.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If fixed number of ECCEs per PRB is used for EPDCCH transmission, then resource allocation is simplified, but resource utilization efficiency deteriorates leading to high blocking probability
Solution Approach 1:
The patent applies dynamics by making the number of ECCEs per PRB adjustable rather than fixed. The eNB can dynamically configure different numbers of ECCEs (e.g., 2 or 4) in different PRBs based on channel conditions, traffic load, and UE requirements. This dynamic configuration allows the system to adapt resource allocation to actual needs, improving resource utilization efficiency while maintaining manageable complexity through standardized configuration options.
Solution Approach 2:
The patent changes the parameter of ECCE count per PRB from a fixed value to a configurable variable. By allowing the number of ECCEs to be changed based on system conditions (e.g., 2 ECCEs for good channel conditions, 4 ECCEs for poor conditions), the system optimizes resource utilization without requiring complete redesign of the resource allocation framework.
2Reliability
If ECCE aggregation is used to transmit control information, then reliability is improved, but resource consumption increases leading to blocking probability
Solution Approach 1:
The patent applies dynamics by making the aggregation level configurable rather than fixed. The eNB can select different aggregation levels (1, 2, 4, 8, 16, or 32 ECCEs) based on channel conditions and UE capabilities. In good channel conditions, lower aggregation levels reduce resource consumption while maintaining adequate reliability. In poor conditions, higher aggregation levels ensure reliable delivery despite increased resource usage.
Solution Approach 2:
The patent changes the aggregation level from a fixed parameter to a variable that can be adjusted based on system conditions. This allows the system to optimize the trade-off between reliability and resource consumption by selecting appropriate aggregation levels dynamically, rather than always using the most conservative (highest aggregation) setting.
3Device complexity
If fixed blind decoding candidate numbers are used for each aggregation level, then UE complexity is reduced, but system adaptability deteriorates
Solution Approach 1:
The patent changes the blind decoding candidate count from a fixed parameter to a configurable parameter. The eNB can indicate different numbers of blind decoding candidates (e.g., 1, 2, 4, or 8) based on the selected aggregation level and system conditions. This allows the system to adapt to different scenarios (e.g., more candidates for high aggregation levels, fewer for low aggregation levels) while keeping the UE implementation manageable through standardized configuration options.
Data Source
AI summary
A method of handling an enhanced physical downlink control channel (EPDCCH) for a network of a wireless communication system comprises calculating the average number of available resource elements (REs) in one control channel element (CCE) for EPDCCH in a physical resource block (PRB); selecting an aggregation level from a first aggregation level set; calculating the number of available REs in a EPDCCH for the selected aggregation level according to the selected aggregation level and the average number of available REs in one CCE; selecting a first candidate number set according to a second comparison result between the number of available REs in the EPDCCH for the selected aggregation level and a second threshold; and determining an aggregation level and the number of blind decoding candidates corresponding to the determined aggregation level, for transmitting control information dedicated to a user equipment.