Reference Signal Scheduling for Low-Power PDCCH Paging Detection
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Solution Overview
Problem
In current wireless communications systems, terminal devices face high power consumption when monitoring PDCCH search spaces for paging scheduling messages and wake-up signals, even if no corresponding messages are sent, due to the need for blind detection across all candidate locations.
Innovation Solution
A method where a network device determines a time domain resource based on the quantity of paging occasions in a discontinuous reception period and sends a reference signal to the terminal device on this resource, allowing the terminal device to perform measurements and reduce power consumption by terminating monitoring early if no wake-up signal is detected.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the terminal device performs blind detection on all candidate locations in PDCCH search space, then the terminal device can detect paging scheduling messages, but the power consumption increases
Solution Approach 1:
The network device sends a wake-up signal before the paging occasion to preliminarily indicate whether the terminal device needs to monitor the PDCCH. This preliminary action allows the terminal device to avoid performing blind detection on all candidate locations when no paging message will be sent, thereby reducing power consumption while maintaining detection capability when needed.
Solution Approach 2:
A wake-up signal is introduced as an intermediary between the network device and the terminal device. This intermediary provides additional information to the terminal device, enabling it to make informed decisions about whether to perform blind detection, thus resolving the contradiction between reliable detection and power consumption.
2Reliability
If the terminal device monitors PDCCH at every paging occasion, then the terminal device can detect paging scheduling messages, but unnecessary power consumption occurs when no messages are sent
Solution Approach 1:
The wake-up signal is sent in advance of the paging occasion to preliminarily inform the terminal device whether monitoring is necessary. This allows the terminal device to skip monitoring in paging occasions where no messages will be sent, eliminating energy waste while preserving message detection capability when messages are actually sent.
Solution Approach 2:
The wake-up signal is transmitted periodically before each paging occasion, providing a rhythm that allows the terminal device to efficiently determine when to activate monitoring. This periodic structure enables the terminal device to remain in a low-power state during intervals when no paging messages are expected, reducing overall energy consumption.
3Reliability
If the terminal device waits for maximum WUS duration to end, then the terminal device can confirm no WUS exists, but power consumption increases during the waiting period
Solution Approach 1:
The network device sends the wake-up signal in advance of the paging occasion, allowing the terminal device to detect its presence or absence before committing to full monitoring. This preliminary detection enables the terminal device to make early decisions about monitoring activation, reducing the duration of high-power operation while maintaining detection accuracy.
Data Source
AI summary
Example reference signal sending methods and apparatus are described. In one example method, a terminal device detects whether a paging scheduling message exists in a PDCCH search space whose starting subframe is a subframe corresponding to a paging occasion (PO), and/or detects whether a wake-up signal (WUS) exists before a PO. A network device determines a time domain resource in first duration based on a quantity of paging occasions in a discontinuous reception period, where the time domain resource is a time domain resource in a time-frequency resource used to transmit a reference signal. The network device sends the reference signal to a terminal device on the time domain resource.