Downlink Control Channel Repetition Quantity Determination
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Solution Overview
Problem
In radio communications, especially in M2M scenarios with poor network coverage, UE struggles to accurately determine the repetition quantity of the downlink control channel, leading to resource wastage and increased power consumption due to incorrect detection and repeated attempts to receive data channels.
Innovation Solution
A method and apparatus that acquire and process information corresponding to the repetition quantity of the downlink control channel, allowing the UE to correctly determine the repetition level by sending processed downlink control information, which includes scrambling and channel coding, ensuring synchronization with the network side's repetition quantity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the network side switches repetition level dynamically to adapt to changing channel conditions, then the adaptability of the downlink control channel is improved, but the UE detection accuracy deteriorates because the UE continues to use the old repetition level for detection
Solution Approach 1:
The patent introduces a feedback mechanism where the network side sends downlink control information containing repetition quantity indication to the UE. The UE uses this feedback information to adjust its detection parameters and correctly identify the repetition level being used, resolving the mismatch between network switching and UE detection
Solution Approach 2:
The patent introduces downlink control information as an intermediary carrier that conveys repetition quantity indication from the network side to the UE. This intermediary mechanism enables the UE to accurately determine the current repetition level without directly observing network side operations
2Device complexity
If the UE blindly detects the downlink control channel using preset repetition levels, then the device complexity is reduced, but the resource utilization deteriorates due to failed detections and repeated transmission attempts
Solution Approach 1:
The patent applies preliminary action by having the network side pre-configure and indicate the repetition quantity to the UE before actual data transmission. This allows the UE to prepare the correct detection parameters in advance, avoiding failed detection attempts and improving resource utilization
Solution Approach 2:
The patent implements parameter changes by dynamically adjusting the repetition quantity parameter based on channel conditions while providing explicit indication to the UE. This allows the system to optimize transmission reliability without causing detection failures, as the UE is informed of the parameter changes in advance
3Reliability
If the UE continues to detect data channels after failed reception, then the reliability of data reception is improved, but the power consumption increases due to repeated detection attempts
Solution Approach 1:
The patent applies preliminary action by providing the UE with accurate repetition quantity information before data transmission. This enables the UE to perform detection with correct parameters from the first attempt, reducing the need for repeated detection and thereby lowering power consumption while maintaining reliability
Data Source
AI summary
Embodiments of the present invention provide a method and an apparatus for determining a repetition quantity of a downlink control channel, which relate to the radio communications field. The method includes: acquiring processing information corresponding to a repetition quantity of a downlink control channel; and sending the downlink control channel to user equipment UE according to the processing information, where the downlink control channel is used to carry processed downlink control information, so that the UE determines the repetition quantity of the downlink control channel according to the processing information. The apparatus includes a first acquisition module and a sending module. In the present invention, a repetition quantity sent by a network side is the same as a repetition quantity detected by UE.