RAN Message Waiting Indicator Delivery Mechanism
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Solution Overview
Problem
In wireless communication systems, message waiting indicators (MWIs) for voicemail messages often fail to be properly delivered to wireless communication devices due to network congestion or misrouting, leading to delayed notification of pending voicemail messages, which can be urgent.
Innovation Solution
The radio access network (RAN) determines if a call has been missed and, after a pre-defined time without MWI transmission, generates a message waiting query to the voicemail storage system. If a message is found, the RAN forwards a message waiting indicator (MWI) to the device using page request messages with specific timeout and maximum transmission parameters, differentiated from regular page requests to ensure timely delivery.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If the RAN waits for the voicemail system to automatically send an MWI after a missed call, then the system complexity is reduced, but the delivery time of the MWI is significantly delayed
Solution Approach 1:
The RAN proactively sends a message waiting query to the voicemail system before the voicemail is actually left, or immediately when a missed call is detected. This preliminary action triggers the voicemail system to prepare and send the MWI notification, significantly reducing the delay compared to waiting for automatic MWI generation after voicemail deposition.
Solution Approach 2:
The RAN implements a feedback mechanism by sending a message waiting query to the voicemail system and waiting for a response. If no MWI is received within a predetermined time period, the RAN retransmits the query or takes alternative actions to ensure the MWI is delivered to the WCD.
2Device complexity
If the RAN uses standard page request message parameters for MWI delivery, then the communication protocol is simplified, but the MWI may be lost in network congestion or require excessive retransmissions
Solution Approach 1:
The RAN applies different transmission parameters specifically for MWI delivery compared to regular page requests. When an MWI needs to be sent to a WCD, the RAN uses optimized parameters such as adjusted timeout values and maximum transmission counts, ensuring more reliable delivery of this critical notification while maintaining standard protocols for other communications.
Data Source
AI summary
Methods and systems for triggering the delivery of a message waiting indicator (MWI) are introduced. In a wireless communication network, a radio access network (RAN) determines that a wireless communication device (WCD), such as a mobile phone, has missed an incoming call, and responsively: (i) routes the incoming call to a message storage system to enable an originator of the call to leave a message for a user of the WCD, (ii) waits a period of time after routing the incoming call to the message storage system, and (iii) then generates and transmits a message waiting query to the message storage system without prompting from the WCD. In response to the message waiting query, the message storage system may transmit a signal indicative of the message to the RAN. Responsively, the RAN may then transmit to the WCD a message waiting indication (MWI) indicative of the message, for presentation of the MWI to the user of the WCD.