EPDCCH Resource Allocation for Heterogeneous Network Control
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Solution Overview
Problem
In heterogeneous network deployments and CoMP transmission schemes, there is a challenge in effectively notifying control information from a base station to a terminal, leading to capacity issues in the notification area, which hinders transmission efficiency between the base station and the terminal.
Innovation Solution
The implementation of a base station and terminal apparatus that utilize enhanced physical downlink control channels (EPDCCH) and physical downlink shared channels (PDSCH) to efficiently transmit control information, with advanced coding, modulation, and precoding techniques, along with specific reference signals for channel estimation, to improve communication efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If general notification methods are used for control information in heterogeneous network deployment and CoMP transmission schemes, then the implementation is simple, but the notification area capacity is insufficient and transmission efficiency is poor
Solution Approach 1:
The notification area is segmented into multiple regions (first notification area and second notification area) with different capacities and characteristics. The first notification area uses conventional PDCCH resources while the second notification area uses EPDCCH resources, allowing control information to be distributed across segmented regions with different capabilities.
Solution Approach 2:
The patent introduces a new dimension for control channel notification by adding the second notification area (EPDCCH) alongside the traditional first notification area (PDCCH). This dimensional expansion in the notification space enables simultaneous use of multiple notification mechanisms with different capacities and interference characteristics.
2Productivity
If resources are shared among macro base station and RRHs, then frequency utilization efficiency is improved, but interference management becomes more difficult
Solution Approach 1:
Different notification areas are assigned different qualities and characteristics suited to their local conditions. The first notification area (PDCCH) is optimized for macro base station coverage while the second notification area (EPDCCH) is optimized for RRH-specific scenarios, allowing each region to operate with locally optimized parameters.
Solution Approach 2:
The patent introduces an intermediary mechanism for managing resources between macro base station and RRHs. The control information notification system acts as an intermediary that coordinates resource usage, allowing shared resources to be managed through differentiated notification areas that mediate between conflicting demands.
3Quantity of substance
If control information is transmitted using conventional PDCCH only, then the implementation is straightforward, but the notification area capacity is limited
Solution Approach 1:
The patent merges two different control channel notification areas (PDCCH-based first notification area and EPDCCH-based second notification area) into a unified control information transmission system. This combination allows the system to leverage the strengths of both conventional and enhanced control channels, achieving greater total capacity than either could provide alone.
Data Source
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AI summary
The present invention enables a base station apparatus to efficiently notify a mobile station apparatus of control information in a wireless communication system in which the base station apparatus and the mobile station apparatus communicate. An EPDCCH consists of one or a plurality of ECCEs, and each of the ECCEs consists of a plurality of EREGs. When the EPDCCH is transmitted using distributed mapping, each resource element in each EREG is associated with one out of two antenna ports in an alternating manner, and the base station apparatus and the mobile station apparatus communicate based on the association.