Paging Power Saving PDCCH for UE Energy Reduction
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Solution Overview
Problem
Reduced capability User Equipment (UE) devices, such as industrial wireless sensors and wearables, require extended battery life, and even for enhanced mobile broadband (eMBB) and ultra-reliable low-latency communication (URLLC) UEs, reducing power consumption is crucial to improve user experiences and enable new use cases. Existing technologies incur additional power consumption during paging reception due to unnecessary UE wake-ups and measurements for synchronization signals.
Innovation Solution
Implementing a Paging Power Saving Physical Downlink Control Channel (PPS-PDCCH) that indicates whether to monitor paging DCI, allowing UEs to autonomously determine the associated Radio Network Temporary Identifier (RNTI) and skip unnecessary wake-ups, enabling UEs to transition from RRC_INACTIVE to RRC_IDLE mode without decoding paging messages, thereby reducing power consumption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If UE monitors paging DCI in every paging period, then paging reception reliability is improved, but power consumption increases
Solution Approach 1:
The network transmits a first DCI format before the actual paging DCI to preliminarily indicate whether paging information will be sent. The UE checks this preliminary indication first, and only if indicated, proceeds to monitor and decode the actual paging DCI. This preliminary action avoids unnecessary full paging monitoring and reduces power consumption while maintaining reliable paging reception.
2Measurement precision
If UE performs measurements for synchronization signals during paging reception, then synchronization accuracy is improved, but power consumption increases
Solution Approach 1:
The first DCI format is transmitted and checked before the UE performs measurements for synchronization signals during paging reception. By having the network indicate in advance whether paging will occur, the UE can avoid unnecessary wake-ups and skip the power-intensive synchronization signal measurements when no paging is intended, thus reducing power consumption while maintaining synchronization accuracy when needed.
3Loss of information
If UE decodes all paging messages, then paging information completeness is improved, but processing time increases
Solution Approach 1:
The solution extracts and separates the paging indication function from the full paging message decoding process. The first DCI format carries the essential indication of whether paging will be sent, allowing the UE to extract this critical information first and avoid decoding complete paging messages when none are intended. This extraction approach ensures no paging information is lost when needed while significantly reducing unnecessary processing time.
Data Source
AI summary
Apparatuses, methods, and systems are disclosed for power-efficient paging reception. One apparatus includes a processor and a transceiver that receives a PDCCH configuration of a first DCI format, where the PDCCH configuration includes a search space configuration of the first DCI format. Via the transceiver, the processor detects the first DCI format by monitoring the first DCI format according to the search space configuration, where the first DCI format indicates whether the apparatus is to monitor for paging DCI of a second DCI format. The processor monitors for paging DCI of the second DCI format in a paging period based on the detected first DCI format.