LP-WUS Payload Signaling for Selective Paging Receiver Wake-Up
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Solution Overview
Problem
Existing wireless communication systems face challenges in conserving power during idle mode due to the need for UEs to monitor for paging early indications (PEIs), which may not always indicate a paging message, reducing the power-saving benefits of idle mode.
Innovation Solution
Implementing a low power wake-up receiver (LP-WUR) to detect low power wake-up signals (LP-WUS) that activate a main radio for active state and paging messaging, reducing power consumption and latency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If UEs monitor for paging early indications (PEIs) during idle mode, then paging message delivery reliability is improved, but power consumption increases
Solution Approach 1:
The patent segments the paging indication mechanism into two parts: a low-power wake-up signal (WUS) that indicates whether a PEI is transmitted, and the actual PEI that indicates whether a paging message is scheduled. This segmentation allows the UE to first check the low-power WUS before consuming more power to monitor the PEI, thereby reducing unnecessary power consumption while maintaining reliable paging message delivery when needed.
Solution Approach 2:
The network transmits the wake-up signal (WUS) before the paging early indication (PEI) to provide advance notification. The WUS serves as a preliminary action that allows the UE to prepare for potential PEI monitoring only when necessary, rather than continuously monitoring for PEIs during idle mode, thus reducing power consumption while ensuring reliable paging delivery when the WUS indicates a PEI is forthcoming.
2Speed
If UEs continuously monitor for PEIs during idle mode, then paging responsiveness is improved, but power-saving benefits are reduced
Solution Approach 1:
The patent implements periodic monitoring of the wake-up signal (WUS) during idle mode, where the UE monitors for WUS transmissions at predetermined intervals rather than continuously monitoring for PEIs. This periodic action maintains paging responsiveness by ensuring the UE is alerted when a PEI is transmitted, while significantly reducing power consumption by allowing the UE to remain in a lower-power state between WUS monitoring cycles.
Solution Approach 2:
The wake-up signal (WUS) acts as an intermediary between the network and the UE's paging monitoring mechanism. Instead of the UE directly and continuously monitoring for PEIs (which consumes power), the WUS serves as an intermediary indicator that notifies the UE when a PEI is transmitted. This intermediary mechanism maintains paging responsiveness while enabling power-saving benefits by allowing the UE to stay in idle mode longer without continuous monitoring.
3Reliability
If UEs wake up to monitor PEIs, then paging message reception is improved, but latency increases
Solution Approach 1:
The network transmits the wake-up signal (WUS) before the paging early indication (PEI) to provide advance notification. This preliminary action allows the UE to wake up and monitor the PEI only when the WUS indicates it is transmitted, rather than waking up continuously or waking up before the PEI is actually transmitted. This reduces latency by ensuring the UE is alerted in advance while minimizing unnecessary wake-ups.
Data Source
AI summary
Certain aspects of the present disclosure provide techniques for method for wireless communications by a user equipment (UE), generally including monitoring, using a first receiver, for one or more wake up signals (WUS) that map to a paging early indicator (PEI) and indicate paging subgroup information for one or more paging occasions (POs) that have a scheduled paging message and waking up a second receiver to monitor for a paging message if a WUS is detected with a payload that indicates a paging message is scheduled in a PO for a paging subgroup to which the UE belongs.