EPDCCH Resource Allocation for Heterogeneous Network Control
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Solution Overview
Problem
In heterogeneous network deployments, conventional methods for notifying control information from base stations to terminals face capacity issues, leading to inefficient communication transmission efficiency.
Innovation Solution
The implementation of an enhanced physical downlink control channel (EPDCCH) processing unit in base stations and terminals, which monitors and maps EPDCCH candidates based on predetermined criteria, such as resource element availability and cyclic prefix types, to efficiently transmit control information.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If conventional methods are used for notifying control information from base stations to terminals in heterogeneous network deployments, then the notification region capacity is insufficient, but transmission efficiency is improved through resource sharing
Solution Approach 1:
The notification region is segmented into multiple search spaces (common search space and user-specific search space), allowing different types of control information to be notified through different segments. This increases the overall notification capacity while maintaining efficient resource utilization for each segment type.
Solution Approach 2:
The patent introduces a new dimension for control information notification by implementing enhanced physical downlink control channels in addition to conventional channels. This multi-dimensional approach allows the system to maintain backward compatibility while expanding notification capacity through resource block group-based allocations.
2Productivity
If the same resources are used by macro base station and RRHs, then frequency use efficiency is improved, but interference occurs at cell edges
Solution Approach 1:
Different quality levels of resource allocation are applied locally: cell-center users utilize shared resources for high frequency efficiency, while cell-edge users receive protected resources with coordinated beamforming and power control to minimize interference. This local differentiation resolves the contradiction between efficiency and interference.
Solution Approach 2:
The system dynamically changes transmission parameters (power levels, beamforming vectors, resource block assignments) based on user location and channel conditions. This allows the same physical resources to serve different users with different parameter configurations, achieving both high frequency efficiency and interference management.
3Productivity
If EPDCCH candidates are determined based on resource element criteria, then control information notification efficiency is improved, but device complexity increases
Solution Approach 1:
Search space candidates are preliminarily determined and configured through higher-layer signaling before actual control information transmission. This preliminary configuration reduces real-time processing complexity while maintaining notification efficiency, as the terminal only needs to monitor pre-defined candidate positions rather than searching all possible resource elements.
Data Source
AI summary
In a wireless communication system in which a base station communicates with a terminal, the base station efficiently notifies of control information for the terminal. A base station apparatus maps an EPDCCH to any of candidates of the EPDCCH included in each of a first EPDCCH set and a second EPDCCH set which are configured by RRC signaling, and a mobile station apparatus monitors the candidate of the EPDCCH. The candidate of EPDCCH is determined at least based on the number of resource elements satisfying a predetermined criterion in one of physical resource block pairs that are configured for EPDCCH transmission in the first EPDCCH set.