Paging Reception With PEI-Compatible Two-Stage Wake-Up
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Solution Overview
Problem
Existing wireless communication systems are inefficient in power consumption during paging procedures due to UEs activating full receive chains to decode potential paging messages, even when none are intended, and not all UEs support paging early indications (PEI) for two-stage wake-up optimization.
Innovation Solution
UEs transmit capability information indicating support for PEI and a minimum gap between scheduling messages, allowing base stations to configure appropriate paging reception, using PEI for capable UEs and separate DCI for non-capable UEs to enable two-stage wake-up.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If UEs activate full receive chains to decode paging messages during paging occasions, then paging reception reliability is improved, but power consumption increases significantly
Solution Approach 1:
The paging reception process is segmented into two stages: first, the UE wakes up early to monitor a simplified control channel for paging indication; second, based on the indication, the UE decides whether to activate the full receive chain for complete paging message decoding. This segmentation allows the UE to avoid full activation when no paging message is present, reducing power consumption while maintaining reliability when paging is actually sent.
Solution Approach 2:
The system performs preliminary action by sending a paging indication message before the actual paging message. The UE monitors this early indication in a low-power state, and only activates the full receive chain if the indication suggests paging is present. This preliminary check prevents unnecessary full activation and associated power consumption.
2Use of energy by moving object
If the system implements paging early indication (PEI) for two-stage wake-up, then power efficiency is improved, but device compatibility deteriorates due to limited UE support
Solution Approach 1:
The system applies different paging reception qualities to different UEs based on their capabilities. UEs that support PEI use the two-stage wake-up mechanism with early indication monitoring, while UEs without PEI support use the traditional full activate approach. This local differentiation ensures each UE operates in the most efficient mode for its capabilities, maintaining overall system compatibility.
Solution Approach 2:
The base station is designed to support multiple paging modes universally - it can send paging indications to PEI-capable UEs and direct paging messages to non-capable UEs. This multi-functionality allows the system to accommodate both types of UEs within the same network infrastructure, ensuring broad adaptability while still providing power efficiency benefits where applicable.
3Measurement precision
If UEs monitor control channels continuously for paging messages, then paging message detection accuracy is improved, but unnecessary power consumption occurs when no paging is present
Solution Approach 1:
Instead of performing the complete action of monitoring and decoding all paging messages, the UE performs partial action by first monitoring only the paging indication. If the indication shows no paging is present, the UE stops there, avoiding the excessive action of full message decoding. This partial monitoring approach eliminates unnecessary power consumption while maintaining detection accuracy for actual paging messages.
Data Source
AI summary
In a wireless network, a base station may transmit a paging early indication (PEI) to a user equipment (UE) before a paging occasion (PO) to indicate whether the UE should wake up to receive a page, which is more power-efficient than legacy paging reception. However, UEs may not universally support PEI. Furthermore, a UE lacking PEI support cannot realize the potential power savings offered by a PEI. Accordingly, a UE may transmit, to a base station, capability information indicating whether the UE supports a PEI, and the base station may configure paging reception for the UE based at least in part on the capability information. In some aspects, the capability information indicates a minimum gap between a message scheduling a page and a message carrying the page, which allows a two-stage wake up to be implemented for UEs that support a PEI and UEs that lack PEI support.