NR-U Control Channel Transmission in Fixed Frame Period
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Solution Overview
Problem
In the frame-based equipment (FBE) channel access mode of new radio (NR-U) systems, terminal devices experience high power consumption and resource waste due to continuous monitoring of downlink control channels, even when no downlink control channel is transmitted, leading to inefficient resource utilization.
Innovation Solution
A control channel transmission method where a terminal device determines a search space set within a channel occupancy time (COT) and monitors a physical downlink control channel (PDCCH) only when slot structure indication information is available, allowing the network device to transmit PDCCH within the COT if resources are available, and not transmitting if resources are unavailable, thereby optimizing resource usage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the terminal device continuously monitors the downlink control channel in the channel occupancy time of a fixed frame period, then the terminal device can detect downlink control information, but the power consumption increases and resources are wasted
Solution Approach 1:
The terminal device performs periodic monitoring of the downlink control channel based on configured search space sets rather than continuous monitoring. The monitoring occurs at specific periodic intervals defined by the search space configuration, which reduces power consumption while ensuring reliable detection of downlink control information at appropriate moments.
Solution Approach 2:
The monitoring behavior of the terminal device is made dynamic by configuring multiple search space sets with different monitoring parameters (periods, offsets, densities). The terminal device can adapt its monitoring pattern based on the configured parameters and network conditions, optimizing the balance between detection reliability and power consumption.
2Reliability
If the terminal device continuously monitors the downlink control channel, then no control information is missed, but resource utilization becomes inefficient
Solution Approach 1:
By implementing periodic monitoring at configured intervals rather than continuous monitoring, the system reduces unnecessary resource usage while maintaining effective control information reception. The periodic search space sets define specific monitoring occasions that are sufficient for reliable communication but efficient in resource utilization.
Solution Approach 2:
The terminal device monitors the control channel at selected partial occasions defined by search space sets rather than at every possible opportunity. This partial monitoring approach is sufficient for reliable operation while avoiding excessive resource consumption associated with continuous monitoring at all times.
3Measurement precision
If the terminal device performs long-term information monitoring, then the detection accuracy is maintained, but the power consumption increases
Solution Approach 1:
The search space set configuration enables periodic monitoring at optimized intervals that maintain detection accuracy while reducing power consumption. The monitoring period and offset parameters are configured to ensure accurate channel detection at critical moments without requiring continuous monitoring that would drain battery power.
Solution Approach 2:
The monitoring parameters (period, offset, density) of the search space sets can be configured and changed to optimize the balance between detection accuracy and power consumption. By adjusting these parameters, the system adapts monitoring intensity to match actual channel conditions and traffic requirements, maintaining accuracy when needed while saving power during quieter periods.
Data Source
AI summary
Embodiments of the present application provide a control channel transmission method and apparatus, and a storage medium. A network device determines a first search space set within a COT of a fixed frame period, transmits a first PDCCH in the first search space when it is determined that a resource in the COT is available, and does not transmit a downlink channel or a downlink signal in the COT when it is determined that a resource in the COT is unavailable, where the first PDCCH is used to transmit slot structure indication information, and the slot structure indication information is used to determine a slot structure of the COT. Correspondingly, a terminal device, after determining a first search space set within a COT of a fixed frame period, monitors a first PDCCH according to the first search space set.