Paging Wake-Up Signal Mapping for Low-Power UE Monitoring
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Solution Overview
Problem
In extreme coverage limited situations, user equipment (UE) in idle mode needs to monitor paging messages inefficiently, leading to high power consumption due to unnecessary wake-up times while waiting for DCI format N2, as existing wake-up signal (WUS) configurations do not account for varying UE probabilities and radio channel qualities.
Innovation Solution
A method to determine an optimal WUS to PO mapping parameter by analyzing historical paging events, radio channel quality, and power consumption patterns to minimize power consumption by configuring WUS appropriately for individual or group UEs based on their specific traffic patterns and radio conditions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If UE uses long DRX/eDRX cycles to reduce power consumption, then power efficiency is improved, but the UE may miss paging messages due to extended wake-up time requirements
Solution Approach 1:
The network transmits wake-up signals in advance before the paging occasion to indicate whether the UE needs to wake up for paging. This preliminary indication allows the UE to make informed decisions about waking up, balancing power saving with reliable paging reception.
Solution Approach 2:
The system implements feedback mechanisms where the network provides information about paging status to the UE through wake-up signals. This feedback loop allows the UE to adjust its wake-up behavior based on actual paging conditions, improving both power efficiency and reliability.
2Reliability
If UE monitors NPDCCH continuously to ensure paging detection, then paging reliability is improved, but power consumption increases due to extended wake-up time
Solution Approach 1:
The wake-up signal is transmitted in advance to indicate whether paging is present before the UE needs to fully monitor the NPDCCH. This preliminary action allows the UE to skip unnecessary monitoring, reducing power consumption while maintaining reliable paging detection when needed.
Solution Approach 2:
The wake-up signal extracts the essential paging indication information from the full NPDCCH monitoring process. By separating this preliminary indication from the complete paging message reception, the UE can make power-efficient decisions about whether to proceed with full monitoring.
3Reliability
If UE decodes DCI format N2 in all subframes to ensure paging message detection, then paging reliability is improved, but power consumption increases due to unnecessary decoding attempts
Solution Approach 1:
The wake-up signal provides preliminary information about paging status before the UE attempts to decode DCI format N2. This allows the UE to skip unnecessary decoding operations in subframes where no paging is present, significantly reducing energy waste while maintaining reliable detection when paging occurs.
Solution Approach 2:
The system converts the potentially harmful effect of continuous monitoring and decoding into a beneficial process by using the wake-up signal to indicate when decoding is actually needed. The wake-up signal transforms what would be wasted decoding attempts into a targeted, efficient process.
4Reliability
If network transmits WUS in every PO to ensure paging indication, then paging reliability is improved, but network overhead increases
Solution Approach 1:
The wake-up signal transmission strategy is adapted to local conditions by using discontinuous transmission patterns. Instead of uniform transmission in every paging occasion, the network adjusts transmission based on actual paging needs, reducing overall signal volume while maintaining reliable indication where required.
Solution Approach 2:
The wake-up signal uses periodic or pulsed transmission patterns rather than continuous transmission. By timing the WUS transmission to coincide with actual paging occasions and using discontinuous patterns, the network reduces signal transmission volume while maintaining reliable paging indication.
Data Source
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AI summary
Methods and apparatuses for paging are disclosed. According to an embodiment, a paging related entity obtains first information about a probability at which each of at least one terminal device is paged at a paging occasion (PO). The paging related entity obtains second information about a first power consumption and a second power consumption spent by each of the at least one terminal device for detecting a wake up signal (WUS) and a paging message respectively. The paging related entity determines, for multiple applicable WUS to PO mapping parameters, corresponding power consumptions spent by the at least one terminal device in a paging time window (PTW), based on the first and second information. The paging related entity determines, as a target WUS to PO mapping parameter to be applied to the at least one terminal device, one of the multiple applicable WUS to PO mapping parameters corresponding to a lowest power consumption in a PTW.