Enhanced Physical Downlink Control Channel Mapping for Wireless Terminals
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Solution Overview
Problem
Conventional methods fail to efficiently map and specify transmission data intended for individual terminals or common to multiple terminals in wireless communication systems, particularly when using enhanced physical downlink control channels, leading to suboptimal transmission efficiency.
Innovation Solution
The system employs a configuration where a base station uses both physical and enhanced physical downlink control channels to notify terminals of control information, utilizing specific RNTIs for masking and CRC check bits to enable efficient extraction of dedicated and broadcast data, allowing terminals to differentiate between individual and common transmission data.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If both physical downlink control channel and enhanced physical downlink control channel are used to notify terminals of control information, then the number of terminals that can be served increases, but transmission efficiency deteriorates due to inability to efficiently map and specify transmission data
Solution Approach 1:
The patent segments the control channel functionality by introducing separate enhanced physical downlink control channels (E-PDCCH) in addition to the traditional physical downlink control channel (PDCCH). This segmentation allows different types of control information to be transmitted through different channels, enabling efficient mapping of transmission data to specific terminals or groups of terminals while serving a larger number of terminals simultaneously.
Solution Approach 2:
The patent applies local quality by assigning specific properties to different control channels: the PDCCH handles certain control information while the E-PDCCH handles other control information, particularly for terminal-specific and common transmission data. This localized functional assignment optimizes the transmission efficiency for different types of data while maintaining the ability to serve multiple terminals.
2Productivity
If conventional methods are used for mapping transmission data in the presence of enhanced physical downlink control channel, then device complexity remains manageable, but transmission efficiency deteriorates due to inability to specify common transmission data to multiple terminals
Solution Approach 1:
The patent segments the control information transmission by introducing E-PDCCH as a separate entity from PDCCH, with each channel having specific mapping rules and purposes. This segmentation enables efficient specification of common transmission data to multiple terminals through the E-PDCCH while maintaining manageable complexity through standardized mapping procedures.
Solution Approach 2:
The E-PDCCH is designed with multi-functionality to handle both terminal-specific control information and common control information that needs to be transmitted to multiple terminals. This universal capability allows the system to improve transmission efficiency for various types of data without requiring separate specialized channels for each function.
Data Source
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AI summary
There are provided a base station, a terminal, a communications system, and a communications method which enable efficient transmission and reception of transmission data even in the case where the base station notifies the terminal of control information via an enhanced physical downlink control channel. A terminal configured to perform communication with a base station monitors a physical downlink control channel mapped to a physical downlink control channel region, and acquires higher-layer control information indicating a plurality of enhanced physical downlink control channel regions different from the physical downlink control channel region. In the case where the terminal has acquired the higher-layer control information, the terminal monitors an enhanced physical downlink control channel mapped to at least one region from among the plurality of enhanced physical downlink control channel regions, in place of the physical downlink control channel mapped to the physical downlink control channel region.