EPDCCH Resource Mapping Using Frequency-First Indexing
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Solution Overview
Problem
The limited resources in the control region of wireless communication systems hinder the capacity to transmit control information efficiently, especially in systems like LTE/LTE-Advanced, where the control channel is restricted, making it difficult to increase system capacity.
Innovation Solution
The implementation of enhanced control channel elements (ECCEs) and enhanced resource element groups (EREGs) in a data region, using a frequency-first scheme for indexing resource elements, allows for the transmission and reception of control information through a physical resource-block pair in a subframe, optimizing resource allocation and balancing the number of available resource elements per ECCE.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If control information is transmitted through the control region using typical CCEs, then control channel transmission is supported, but the system capacity is limited due to restricted control region resources
Solution Approach 1:
The patent introduces enhanced control channel elements (ECCEs) that operate in a different dimensional space by utilizing resource elements from both control and data regions. This allows control information to be transmitted beyond the traditional control region boundaries, effectively adding a new dimension to control channel resource allocation and increasing system capacity without being constrained by limited control region resources.
2Productivity
If enhanced control channel elements (ECCEs) are introduced to increase system capacity, then more control information can be transmitted, but resource allocation complexity increases
Solution Approach 1:
The patent segments the resource elements into enhanced resource element groups (EREGs) with standardized configurations. Each EREG contains a fixed number of resource elements arranged in specific patterns, which are then grouped into ECCEs. This segmentation approach standardizes the resource allocation unit, making the complex resource allocation manageable through modular, repeatable structures rather than arbitrary assignments.
Solution Approach 2:
The patent changes the parameters of control channel elements by defining ECCEs with specific configurations (e.g., 4 or 8 EREGs per ECCE) and establishing standardized EREG structures. These parameter changes create a systematic framework that simplifies resource allocation while enabling increased control information capacity through the enhanced structure.
3Adaptability or versatility
If resource elements are allocated without standardized grouping, then allocation flexibility is maintained, but imbalance in available resource elements per ECCE occurs
Solution Approach 1:
The patent establishes homogeneous EREG structures where each group contains the same number of resource elements arranged in consistent patterns. This homogeneity ensures that every ECCE is constructed from identical building blocks, guaranteeing uniform resource element distribution across all control channels while maintaining flexibility through the standardized modular design that can be consistently replicated.
Data Source
AI summary
The disclosure is related to transmitting control information in a transmission/reception point and to receiving the control information in user equipment. Particularly, the present disclosure relates to transmitting the control information for user equipment which receives downlink control information through a downlink control channel newly defined in a data region. Furthermore, the present disclosure relates to performing a resource mapping for enhanced control channel elements (ECCEs) of an enhanced physical downlink control channel (EPDCCH).