LP-WUS Assistance Signaling for Low-Power Terminal Scheduling
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Solution Overview
Problem
In existing communication technologies, network side devices lack knowledge of low power wake-up signal (LP-WUS) capabilities and durations, leading to suboptimal message transmission and poor communication performance for terminals.
Innovation Solution
Terminals provide LP-WUS assistance information, including expected time intervals and preference information, to help network side devices schedule and send LP-WUS, control commands, and data, ensuring the terminal can receive these without monitoring the physical downlink control channel within the expected time.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the network side device sends messages without knowing terminal LP-WUS capability and duration, then the network side device can operate independently, but the terminal's communication performance deteriorates
Solution Approach 1:
The terminal performs preliminary action by sending LP-WUS assistance information (including expected time interval and preference information) to the network side device before the actual LP-WUS transmission. This allows the network side device to prepare appropriate messages in advance, ensuring the terminal can receive them during its brief active period without monitoring PDCCH, thereby improving communication performance while eliminating information loss.
2Use of energy by moving object
If the terminal does not monitor PDCCH within expected time interval, then power consumption is reduced, but message reception reliability deteriorates
Solution Approach 1:
The network side device uses the expected time interval information provided by the terminal to preliminarily determine the optimal timing for sending messages. By scheduling messages to arrive exactly when the terminal is active (within the expected time interval after LP-WUS), the system achieves reliable message reception while allowing the terminal to remain in low-power state and not monitor PDCCH continuously.
Solution Approach 2:
The system dynamically adapts message transmission timing based on the terminal's LP-WUS characteristics (expected time interval and preference information). The network side device adjusts its scheduling and message sending timing dynamically to match the terminal's active period, ensuring reliable reception during the brief window when the terminal is monitoring, while maintaining low power consumption overall.
3Reliability
If the network side device schedules without terminal preference information, then scheduling complexity is reduced, but communication performance deteriorates
Solution Approach 1:
The terminal provides preference information (sleep mode preference and LP-WUS indication content preference) in advance to the network side device. This preliminary information allows the network side device to optimize its scheduling and message composition decisions, tailoring transmissions to match terminal preferences and capabilities, thereby improving communication performance without requiring complex real-time adjustments.
Data Source
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AI summary
This application discloses an assistance information sending method and receiving method, a terminal, and a network side device, which pertain to the field of communication technologies. The assistance information sending method in embodiments of this application includes: A terminal sends LP-WUS assistance information, where the LP-WUS assistance information is used to assist in at least one of the following: sending an LP-WUS to the terminal; scheduling the terminal; sending a control command to the terminal; and sending data to the terminal, where the LP-WUS assistance information includes at least one of the following: an expected time interval and preference information; where the terminal does not monitor a physical downlink control channel PDCCH or does not receive data sent by a network within the expected time interval; and the preference information includes at least one of the following: sleep mode preference information and LP-WUS indication content preference information.