Continuous PDCCH Repetition for Coverage With Lower Power Use
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Solution Overview
Problem
The existing 5G New Radio (NR) system's downlink control channel transmission method results in increased power consumption and channel difference due to scattered arrangements and prolonged reception times, which hinder effective demodulation under enhanced coverage conditions.
Innovation Solution
Implementing a method where the downlink control channel is repeatedly transmitted at least twice in each transmission period, with each transmission unit consisting of multiple slots, and determining the length of transmission units and intervals based on channel conditions or predefined protocols to optimize demodulation and reduce power consumption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the downlink control channel is repeatedly transmitted to achieve coverage enhancement, then the coverage is enhanced, but the power consumption increases and channel difference increases
Solution Approach 1:
The patent merges multiple scattered transmission opportunities into continuous transmission units. Instead of transmitting the PDCCH at dispersed time points, the invention groups transmissions into continuous units where multiple repetitions occur back-to-back, reducing the overall time span and thereby reducing power consumption while maintaining coverage enhancement effectiveness
2Reliability
If the downlink control channel is repeatedly transmitted to achieve coverage enhancement, then the coverage is enhanced, but the channel difference increases
Solution Approach 1:
The invention combines multiple transmission repetitions into continuous transmission units, ensuring that all repetitions occur within a short time window. This merging approach minimizes the time interval between transmissions, thereby reducing channel variations and maintaining channel stability while achieving coverage enhancement
Solution Approach 2:
The patent implements continuous transmission within each transmission unit, where the PDCCH is transmitted repeatedly without interruption. This continuous action ensures that the channel conditions remain relatively stable during the transmission sequence, reducing channel difference and improving demodulation performance while maintaining coverage enhancement
3Reliability
If the downlink control channel is transmitted with prolonged reception time, then the coverage is enhanced, but the demodulation performance deteriorates
Solution Approach 1:
The invention merges multiple transmission opportunities into continuous transmission units with defined lengths. By controlling the duration of each transmission unit and ensuring repetitions occur within this limited time window, the patent prevents prolonged reception time while maintaining coverage enhancement, thereby preserving demodulation performance
Solution Approach 2:
The patent introduces dynamic transmission unit length configuration, where the length of transmission units can be adjusted based on channel conditions and coverage requirements. This dynamic adaptation allows the system to optimize the balance between coverage enhancement and demodulation performance by adjusting transmission duration according to actual channel characteristics
Data Source
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AI summary
The present disclosure belongs to the technical field of communications, and relates to a downlink control channel transmission method and apparatus, a terminal and an access network device. The method comprises: repeatedly receiving a downlink control channel on at least one transmission unit in a transmission period of the downlink control channel, each transmission unit being used to continuously and repeatedly transmit the downlink control channel at least twice.