5G UE Paging Offset Signaling for Low-Power Reception
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Solution Overview
Problem
Existing wireless communication technologies face challenges in optimizing power consumption, particularly in idle or inactive modes, due to inefficient paging occasion monitoring, which leads to unnecessary UE wakefulness and increased battery drain.
Innovation Solution
A two-step procedure is introduced, where the UE sends a radio resource control (RRC) setup request message with a paging offset value, and the network node responds with a message containing a PS-paging offset value and PS-P-RNTI, enabling efficient power-saving mechanisms such as cross-slot scheduling and DCI Format X for reduced monitoring, along with aperiodic TRS triggering.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the UE monitors paging PDCCH in idle or inactive modes without knowing the offset, then the UE can receive paging messages, but the UE experiences high power consumption due to unnecessary wakefulness
Solution Approach 1:
The network node performs preliminary action by determining the offset value between paging PDCCH and PDSCH before the UE needs to monitor paging. This offset information is provided to the UE in advance through RRC setup or reconfiguration messages, enabling the UE to calculate and know exactly when to wake up for paging monitoring, thus avoiding unnecessary power consumption while ensuring reliable paging reception.
2Reliability
If the UE wakes up continuously to decode PDCCH, then the UE can ensure it does not miss any paging messages, but the battery life is reduced
Solution Approach 1:
The network node determines and provides the offset value between paging PDCCH and PDSCH in advance through RRC setup or reconfiguration messages. This allows the UE to calculate the exact timing of paging occasions and wake up only when necessary, rather than continuously monitoring, thus extending battery life while ensuring no paging messages are missed.
Solution Approach 2:
The UE uses the provided offset information to establish a periodic wake-up schedule for paging monitoring. Instead of continuous operation, the UE periodically wakes up at calculated paging occasions based on the offset value, maintains a low-power state between occasions, and thus significantly extends battery life while reliably receiving paging messages.
3Device complexity
If the UE does not know the offset between paging PDCCH and PDSCH, then the system configuration is simpler, but the UE cannot optimize its power consumption
Solution Approach 1:
The offset value between paging PDCCH and PDSCH is extracted and provided as separate, dedicated information from the network node to the UE through RRC setup or reconfiguration messages. This extracted parameter enables the UE to independently calculate paging occasion timing and optimize power consumption without increasing overall system configuration complexity, as the offset is a single scalar value that simplifies UE-side calculations.
Data Source
AI summary
An approach to communication by a user equipment (UE) in a wireless communication system that includes the UE sending an RRC setup request message including a paging offset value to a base station. The UE receives an RRC setup message from the network node, the RRC setup message including a PS-paging offset value and a PS-P-RNTI value associated with the UE. Energy conservation approaches for use with paging are described, including paging occasion monitor reporting and configuration, paging-offset reporting, the use of a paging monitoring skipping signal, and the use of dynamic TRS triggering for paging reception.