Downlink Control Channel Frequency Domain Repetition for URLLC
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Solution Overview
Problem
Current downlink control channel designs, such as ePDCCH and MPDCCH, are not suitable for Ultra-Reliable and Low-Latency Communication (URLLC) services due to inefficiencies in latency and reliability, as they do not adequately consider the varying Quality of Service (QoS) requirements for different traffic types and often increase latency through time domain repetition.
Innovation Solution
The method involves selecting and transmitting downlink control channel candidates tailored to specific communication levels that correspond to different aggregation levels, transmission formats, target block error rates (BLER), and latency requirements, with options for repetition in the frequency domain to optimize for URLLC services, thereby improving resource efficiency and reducing latency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If time domain repetition is used for downlink control channel transmission, then reliability is improved, but latency increases
Solution Approach 1:
The patent transitions from time-domain repetition to frequency-domain repetition for downlink control channel transmission. By repeating control channel candidates across different frequency resources rather than time resources, the system achieves reliability improvement without incurring time delays, thus resolving the contradiction between reliability and latency.
Solution Approach 2:
Instead of using the conventional time-domain repetition approach, the patent inverts the repetition dimension to frequency domain. This inversion allows the system to maintain reliability through repetition while avoiding the latency penalty associated with time-domain approaches.
2Adaptability or versatility
If multiple sets of downlink control channel candidates with different aggregation levels are provided, then adaptability to different QoS requirements is improved, but device complexity increases
Solution Approach 1:
The patent implements dynamic selection of downlink control channel candidates based on QoS requirements. The terminal device is configured with multiple sets of candidates having different aggregation levels and can dynamically select the appropriate set based on the service type and QoS needs, enabling adaptability without requiring complex processing for all cases simultaneously.
Solution Approach 2:
The system changes key parameters (aggregation level, number of candidates) of downlink control channel configurations to match different QoS requirements. By adjusting these parameters rather than redesigning the entire control channel structure, the system achieves versatility while controlling complexity.
Data Source
AI summary
Embodiments of the present disclosure provide methods, devices and computer program for downlink control channel transmission and detection. According to one or more embodiments, a method implemented in a network device comprises: selecting, for a terminal device, at least one set of downlink control channel candidates from two or more sets of downlink control channel candidates. Each set of the two or more sets of the downlink control channel candidates is associated with a different communication level, each communication level corresponding to one or more of a different set of aggregation levels, a different set of transmission formats, a different target block error rate (BLER), and a different target latency. The method further comprises transmitting, to the terminal device, the selected at least one set of downlink control channel candidates.