Terminal Device Wake-Up Signal Configuration for Power Saving
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
In communication systems, terminal devices often waste power by continuously monitoring the physical downlink control channel (PDCCH) even when they are not paged, leading to increased power consumption due to the current DRX mechanism where multiple devices monitor the same paging occasion regardless of whether they are paged or not.
Innovation Solution
A method where terminal devices receive a parameter indicating their wake-up signal (WUS) configuration information, allowing them to determine their specific WUS time-frequency resource and only wake up to monitor the PDCCH when necessary, reducing unnecessary monitoring and power consumption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the terminal device monitors the PDCCH on every paging occasion to ensure it does not miss any paging messages, then the reliability of receiving paging messages is improved, but the power consumption of the terminal device increases
Solution Approach 1:
The network device sends a wake-up signal to the terminal device before the paging occasion. The terminal device wakes up in advance to check if there is a paging message intended for it, avoiding the need to continuously monitor PDCCH regardless of whether there is actual paging traffic. This preliminary action reduces unnecessary power consumption while maintaining reliable paging reception.
Solution Approach 2:
A wake-up signal is introduced as an intermediary between the network device and the terminal device. This intermediate signal allows the terminal device to determine in advance whether it needs to wake up for paging, thereby reducing the frequency of PDCCH monitoring and lowering power consumption while ensuring that actual paging messages are not missed.
2Reliability
If multiple terminal devices monitor the PDCCH on the same paging occasion to ensure they can receive paging messages, then the reliability of paging reception is improved, but the power consumption of terminal devices that are not paged increases
Solution Approach 1:
The wake-up signal extracts the function of determining whether paging is needed from the main PDCCH monitoring process. Terminal devices only wake up and monitor PDCCH when they receive a wake-up signal indicating that there is paging traffic for them. This separates the unnecessary monitoring activity from the essential paging reception function, reducing energy loss for devices that are not actually paged.
3Speed
If the terminal device continuously monitors the PDCCH to ensure it can receive paging messages immediately, then the speed of receiving paging messages is improved, but the power consumption increases
Solution Approach 1:
Instead of continuous monitoring, the terminal device uses periodic wake-up signals to determine when to activate PDCCH monitoring. This periodic action maintains the ability to receive paging messages promptly when needed while significantly reducing power consumption during idle periods when no paging is intended.
Data Source
AI summary
Example communication methods and apparatus are described. One example method includes receiving a first parameter by a terminal device from a first device, where the first parameter corresponds to first wake-up signal (WUS) configuration information in at least one piece of WUS configuration information, and the first WUS configuration information includes information about a first WUS time-frequency resource. The terminal device determines the first WUS time-frequency resource based on the first parameter, and receives a first WUS from a second device on the first WUS time-frequency resource, where the first WUS is used to wake up the terminal device. In this method, the terminal device can determine the first WUS time-frequency resource based on the first parameter received from the first device, and then receive the first WUS from the second device on the first WUS time-frequency resource.