LTE-A Base Station e-PDCCH Configuration via RRC Reconfiguration
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Solution Overview
Problem
In the LTE-A system, there is a lack of defined timing for reporting parameters related to enhanced PDCCH techniques to user terminals, which can lead to inefficiencies in multiplexing and interference measurement due to limited PDCCH region allocation.
Innovation Solution
A radio communication system and method that utilizes an LTE-Advanced standard base station apparatus to generate and notify downlink control channel information using an RRC Connection Reconfiguration signal, allowing user terminals to receive and set up this information, including parameters like e-PDCCH multiplexing position, transmission mode, and radio resource allocation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the PDCCH region is extended into the conventional PDSCH region to solve shortage of control information transmission regions, then the capacity to transmit downlink control information to multiple user terminals is improved, but the timing for reporting parameters related to this technique to user terminals is not defined, causing inefficiencies in multiplexing and interference measurement
Solution Approach 1:
The patent applies preliminary action by defining the timing for reporting e-PDCCH parameters in advance through RRC connection reconfiguration signals. The base station notifies user terminals of e-PDCCH configuration parameters (such as resource allocation, multiplexing position, and transmission mode) before the actual e-PDCCH transmission occurs, allowing user terminals to prepare their reception and processing mechanisms in advance, thereby eliminating timing uncertainties and improving overall system efficiency
2Productivity
If multiple user terminals are multiplexed over the PDSCH region using MU-MIMO transmission, then the spectral efficiency and data rates are improved, but the PDCCH region becomes insufficient to transmit control information for all user terminals
Solution Approach 1:
The patent applies dimensionality change by transitioning from traditional time-domain PDCCH transmission to a resource block-based allocation system that utilizes both time and frequency dimensions. The e-PDCCH is transmitted in the second OFDM symbol of the subframe using resource blocks allocated from the PDSCH region, effectively adding a new dimension to control information transmission and enabling efficient multiplexing of multiple user terminals without being constrained by the traditional three-symbol PDCCH region limitation
Data Source
AI summary
The present invention is designed to report parameters related to techniques provided for in the LTE-A system to a user terminal with adequate timing. The radio communication method of the present invention provides a radio communication method in a radio communication system having a base station apparatus that is configured in compliance with LTE-Advanced system standards, and a user terminal that is configured to be able to perform radio communication with the base station apparatus, and, in this radio communication method, the base station apparatus generates downlink control channel information related to an enhanced physical downlink control channel, and notifies the downlink control channel information to the user terminal using an RRC Connection Reconfiguration signal, and the user terminal receives the RRC Connection Reconfiguration signal, and sets up the downlink control channel information.