Early Paging Indicator Reduces Mobile Device Energy Consumption
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Solution Overview
Problem
Current wireless communication systems face challenges in reducing battery energy consumption for user equipment (UE) in idle states, as they require frequent monitoring for paging messages, leading to increased power usage and reduced standby times.
Innovation Solution
The implementation of an early paging indicator (EPI) system, which uses phase-continuous tones transmitted during an early paging indicator occasion to inform UE devices whether a paging message is present or absent, allowing them to adjust their processing state and conserve energy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If UEs frequently monitor for paging messages in RRC_IDLE state, then they can detect incoming traffic and system information updates, but battery energy consumption increases
Solution Approach 1:
The network transmits a paging indicator message before the actual paging occasion to preliminarily inform UEs whether a paging message will be present. This allows UEs to prepare in advance and avoid unnecessary wake-up and processing operations, thereby reducing energy consumption while maintaining reliable paging detection.
Solution Approach 2:
A paging indicator message is introduced as an intermediary between the network's paging decision and the UE's paging reception. This intermediate signal provides advance notification, enabling UEs to optimize their power management by skipping unnecessary processing when no paging message is present, thus resolving the contradiction between reliable detection and energy consumption.
2Reliability
If UEs wake up for every paging occasion to check for messages, then they ensure no messages are missed, but receiver processing complexity and energy consumption increase
Solution Approach 1:
The paging indicator message is transmitted in advance of the paging occasion, allowing UEs to determine beforehand whether they need to perform complex receiver processing. This preliminary information enables UEs to skip processing entirely when no paging message is present, reducing complexity while maintaining reliability.
Solution Approach 2:
Instead of requiring full paging message processing at every paging occasion, the system uses a partial action approach where UEs only perform minimal indicator detection first. Based on the indicator result, UEs then decide whether to proceed with the more energy-intensive full paging processing, thus reducing overall receiver processing complexity while ensuring no messages are missed.
3Use of energy by moving object
If UEs extend their sleep duration in RRC_IDLE state, then energy consumption decreases, but the ability to receive paging messages promptly deteriorates
Solution Approach 1:
The network provides preliminary notification through the paging indicator message transmitted before the actual paging occasion. This allows UEs to extend their sleep duration while still receiving timely notification of incoming paging messages, as the indicator arrives in advance and triggers UE wake-up only when necessary, thus reducing energy consumption without significant delay.
Solution Approach 2:
The system dynamically adjusts UE behavior based on the paging indicator. When the indicator signals no paging message, UEs can maintain extended sleep for maximum energy saving. When the indicator signals a paging message is present, UEs dynamically wake up to receive the message, thus optimizing the balance between energy consumption and reception timeliness.
Data Source
AI summary
A method for reducing energy consumption of mobile devices using a phase-continuous early paging indicator (EPI) is provided. For each of at least one paging occasion either A) an EPI indicative that a page is present in the paging occasion is transmitted during an EPI occasion in advance of the paging occasion, the EPI comprising at least one phase-continuous tone for the EPI occasion, and a page is transmitted during the paging occasion, or B) an EPI indicative that a page is not present in the paging occasion is transmitted during an EPI occasion in advance of the paging occasion, the EPI comprising at least one phase-continuous tone for the EPI occasion. A mobile device is configured to monitor for an EPI that comprises at least one phase-continuous tone for an EPI occasion in advance of its paging occasion in order to determine if a page is potentially present.