UE PDCCH Monitoring Control for Wireless Power Saving
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Solution Overview
Problem
Existing wireless communication technologies face challenges in efficiently managing User Equipment (UE) power consumption, particularly in monitoring the Physical Downlink Control Channel (PDCCH), which contributes significantly to battery drain without optimizing performance requirements.
Innovation Solution
A method and device for controlling UE PDCCH monitoring behavior by configuring and switching Search Space Set Groups (SSSGs) and implementing PDCCH monitoring skipping behaviors, guided by base station coordination and UE capability, using explicit and implicit configuration messages to manage power consumption effectively.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a UE monitors PDCCH in every slot to ensure continuous communication readiness, then communication reliability is improved, but power consumption increases
Solution Approach 1:
The UE dynamically adjusts its PDCCH monitoring behavior based on the configured time window. During the window when the SS/PBCH block is not transmitted, the UE skips PDCCH monitoring to save power. When the SS/PBCH block is transmitted, the UE monitors PDCCH normally to ensure communication reliability. This dynamic adjustment resolves the contradiction between continuous monitoring for reliability and power saving.
Solution Approach 2:
The network configures periodic time windows where SS/PBCH blocks are transmitted, and the UE periodically adjusts its monitoring behavior accordingly. During these periodic windows, the UE knows when to monitor and when to skip monitoring based on the configured pattern, achieving both power savings and maintained reliability through predictable periodic operation.
2Speed
If a UE monitors PDCCH in every slot to ensure continuous communication readiness, then response speed is improved, but power consumption increases
Solution Approach 1:
The UE dynamically switches between monitoring and non-monitoring states based on the configured time window. During the non-transmission window, the UE enters a low-power state without monitoring, reducing power consumption. When transmission occurs, the UE immediately resumes monitoring to maintain response speed, thus resolving the contradiction between continuous monitoring for speed and power saving.
Solution Approach 2:
The network pre-configures the UE with time window information indicating when SS/PBCH blocks will be transmitted. The UE uses this preliminary information to proactively adjust its monitoring behavior, knowing in advance when to activate monitoring and when to save power, thereby maintaining response speed only when necessary and reducing overall power consumption.
3Reliability
If the network transmits SS/PBCH block in every slot to ensure continuous system information availability, then system information availability is improved, but network energy consumption increases
Solution Approach 1:
The network transmits SS/PBCH blocks periodically according to a configured pattern rather than in every slot. The network configures specific time windows where these blocks are transmitted, reducing overall transmission energy consumption while maintaining system information availability during these periodic intervals. This periodic transmission approach resolves the contradiction between continuous availability and energy consumption.
Solution Approach 2:
The network discards SS/PBCH block transmissions during time windows when they are not needed (when no UEs require system information updates), and recovers energy by not transmitting during these periods. The configured time window mechanism allows the network to selectively transmit only when necessary, reducing energy consumption while maintaining information availability when required.
Data Source
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AI summary
This disclosure relates generally to a method, device, and system for saving UE power consumption in wireless communications. One method performed by a UE including receiving, from a wireless communication node, a configuration message comprising configuration information associated with a Physical Downlink Control Channel (PDCCH) monitoring behavior set; receiving, from the wireless communication node, a control message indicating a PDCCH monitoring behavior from the PDCCH monitoring behavior set or a PDCCH monitoring behavior associated with the PDCCH monitoring behavior set; and determining the PDCCH monitoring behavior based on the control message.