PDCCH Search Space Cycling for 5G Terminal Power Saving
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Solution Overview
Problem
The increased power consumption in 5G terminal devices due to frequent PDCCH monitoring in the RRC connected state, particularly when no scheduling occurs, leads to reduced battery life and standby time.
Innovation Solution
Implementing a mechanism for the terminal device to switch between short-cycle and long-cycle PDCCH search spaces based on a first timer and/or control information, optimizing PDCCH monitoring to reduce unnecessary power consumption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If the terminal device performs frequent PDCCH monitoring in the RRC connected state, then the scheduling responsiveness is improved, but the power consumption increases
Solution Approach 1:
The patent implements dynamic switching between two PDCCH monitoring modes: a first monitoring mode with shorter monitoring intervals for high traffic conditions, and a second monitoring mode with longer monitoring intervals for low traffic conditions. The network device configures both modes and controls the switching based on service status, allowing the terminal to adapt its monitoring frequency to actual needs, thus improving scheduling responsiveness when required while reducing power consumption during low activity periods
Solution Approach 2:
The patent changes the monitoring parameter (monitoring interval/cycle) based on service conditions. When service status indicates low traffic, the terminal switches to the second monitoring mode with a longer PDCCH monitoring cycle, reducing the frequency of monitoring operations. This parameter adjustment directly reduces power consumption while maintaining adequate scheduling responsiveness for the actual service load
2Productivity
If the terminal device monitors PDCCH in all time slots, then the scheduling opportunity is maximized, but unnecessary power consumption occurs when no scheduling is present
Solution Approach 1:
The patent implements periodic PDCCH monitoring with two different periods: a first period for the first monitoring mode and a second period for the second monitoring mode. The terminal device monitors PDCCH only at configured periodic intervals rather than continuously in all time slots. By switching to the second monitoring mode with a longer period during low traffic conditions, the terminal reduces the number of monitoring occasions, thereby eliminating unnecessary power consumption while still capturing scheduling opportunities when they occur
3Loss of time
If the terminal device uses short-cycle PDCCH search space, then the scheduling latency is reduced, but the power consumption increases
Solution Approach 1:
The patent dynamically adjusts the PDCCH search space cycle based on service conditions. The first search space configuration corresponds to a short cycle for low latency requirements, while the second search space configuration corresponds to a long cycle for power saving. The network device controls the switching between these configurations based on service status, allowing the system to use short-cycle monitoring only when actually needed for time-sensitive services, and switch to long-cycle monitoring for non-urgent traffic, thus balancing latency requirements with power consumption
Data Source
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AI summary
The embodiments of the application disclose a channel monitoring method and apparatus, a terminal device and a network device. The method comprises: a terminal device receiving first search space configuration information and second search space configuration information which are sent by a network device; and the terminal device determining, on the basis of a first timer and/or first control information, to perform downlink control channel monitoring on the basis of the first search space configuration information or the second search space configuration information.