RAN Message Waiting Notification Power Management
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Solution Overview
Problem
The transmission of message waiting indications (MWIs) to mobile stations after call setup paging failure often fails due to poor RF coverage, leading to delayed notification of voice mail messages, as the same poor RF conditions affect the transmission of MWIs, causing users to be unaware of received messages until they re-register with the network.
Innovation Solution
The Radio Access Network (RAN) transmits MWIs at a higher power level than used for call setup paging in case of failure, specifically to improve the likelihood of successful delivery to mobile stations, particularly in scenarios with air interface noise issues.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If MWI is transmitted at the same power level as call setup paging, then energy consumption is reduced and normal paging operations are maintained, but transmission reliability deteriorates in poor RF coverage conditions leading to failed MWI delivery
Solution Approach 1:
The system dynamically changes the transmission power parameter for MWI based on the detected paging failure condition. When paging fails, the MWI transmission power is increased from the normal level to a higher level, thereby improving transmission reliability in poor RF conditions while maintaining normal power consumption during successful operations
Solution Approach 2:
The system performs a preliminary paging attempt before transmitting MWI. By detecting paging failure in advance, the system can proactively increase transmission power for the subsequent MWI transmission, ensuring reliable delivery before the user becomes aware of the message waiting status
2Loss of time
If MWI transmission uses normal power levels, then device complexity and operation simplicity are maintained, but notification timeliness deteriorates due to repeated transmission failures in poor RF conditions
Solution Approach 1:
The system uses feedback from the paging operation result to control MWI transmission power. When paging fails, this feedback triggers an increase in transmission power for MWI, creating a closed-loop control system that automatically adapts to poor RF conditions and reduces notification delays without requiring complex manual configuration
Data Source
AI summary
Disclosed herein is a mechanism to help improve message waiting notification. In accordance with the mechanism, when a RAN transmits an MWI to a mobile station after unsuccessful call setup paging of the mobile station, the RAN will transmit the MWI at a higher power level than the RAN used for transmitting the call setup paging. Using a higher transmission power specifically for the MWI should help the MWI reach the mobile station, particularly in a scenario where a reason for call setup paging failure was noise on the air interface. Consequently, the disclosed mechanism should help improve user experience by increasing the likelihood that mobile stations will receive and process MWIs soon after the associated voice mail messages are left.