UE Paging Reception Using Wake-Up Signals and PDCCH Offsets
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Solution Overview
Problem
There is a need to reduce power consumption and improve paging efficiency in user equipment (UE) by optimizing paging message reception processes in wireless communication systems.
Innovation Solution
The method involves receiving a wake-up signal (WUS) configuration, an offset value for paging occasions (PO), and monitoring a physical downlink control channel (PDCCH) for a paging radio network temporary identity (P-RNTI) based on WUS detection, with the ability to skip unnecessary monitoring cycles to conserve power.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the UE monitors PDCCH for paging messages in every paging occasion, then paging reliability is improved, but power consumption increases
Solution Approach 1:
A wake-up signal (WUS) is introduced as an intermediary between the network and the UE for paging notification. The WUS is transmitted before the actual paging message, allowing the UE to selectively wake up and monitor PDCCH only when paging is intended, rather than monitoring every paging occasion. This mediator mechanism resolves the contradiction by enabling reliable paging delivery while significantly reducing unnecessary PDCCH monitoring and power consumption.
Solution Approach 2:
The wake-up signal is transmitted in advance before the paging message to prepare the UE for potential paging reception. By performing this preliminary notification action, the network enables the UE to activate its receiver only when needed, rather than continuously monitoring. This preliminary action allows the UE to remain in low-power state during non-paging intervals while ensuring timely response when paging is required.
2Reliability
If the UE monitors PDCCH in all paging occasions, then paging message reception is ensured, but signaling overhead increases
Solution Approach 1:
The wake-up signal serves as a filtering intermediary that reduces the quantity of paging-related signaling interactions. By having the network send WUS first, only UEs that need paging will subsequently monitor and decode PDCCH/Paging messages, reducing unnecessary signaling activity and overhead in the system while ensuring all relevant UEs receive their paging messages reliably.
3Loss of time
If the UE continuously monitors for paging messages, then paging latency is reduced, but power consumption increases
Solution Approach 1:
The system implements periodic wake-up signal transmission at configured intervals before paging occasions. The UE wakes up periodically to check for WUS, and only activates full paging reception when WUS is detected. This periodic action pattern maintains low latency by ensuring the UE is awakened in time for paging messages while avoiding continuous monitoring, thus resolving the contradiction between fast paging response and power consumption.
Data Source
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AI summary
The UE receives a wake-up signal (WUS) configuration related to WUS reception, receives an offset value related to a paging occasion (PO), monitors a physical downlink control channel (PDCCH) for a paging radio network temporary identity (P-RNTI) in first type paging PDCCH monitoring occasions (MOs) which are after a WUS MO, based on detection of a WUS in the WUS MO based on the WUS configuration, detects the PDCCH having a cyclic redundancy check (CRC) scrambled with the P-RNTI based on monitoring of the PDCCH, and acquires the paging message based on the PDCCH. The first type paging PDCCH MOs may be respectively determined by WUS MOs based on the WUS configuration and by the offset value.