Mobile Switching Center Ring Back Tone Playback Without Voice Link
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional ring back tone services can only play customized voice to calling subscribers when the voice link is connected, failing to meet individual requirements for communication services.
Innovation Solution
A method and system that allow the playing of customized ring back tones to calling subscribers by transmitting a route request message from the calling side mobile switching center to the called side home location register, acquiring an absence response message, and instructing a playing device to play the ring back tone based on an identifier returned by the home location register, even when the voice link is not connected.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the conventional ring back tone service is used, then the customized voice can be played to the calling subscriber when the voice link is connected, but the service cannot provide personalized audio experience when the voice link is not connected
Solution Approach 1:
The patent applies preliminary action by checking the called terminal's service status and acquiring the absence response message before attempting to establish a voice link. The home location register determines whether the called terminal has customized ring back tone service in advance, and the calling side mobile switching center prepares to play the customized ring back tone before the voice link is actually connected. This allows the service to be provided even when the voice link cannot be established.
2Reliability
If the voice link connection is required to play ring back tone, then the system can ensure proper audio delivery, but the service becomes unavailable when the called terminal is unreachable
Solution Approach 1:
The patent introduces an intermediary mechanism where the home location register acts as a mediator between the calling and called terminals. The home location register acquires the absence response message of the called terminal and determines whether customized ring back tone service should be provided. This intermediary allows the system to make service delivery decisions without requiring direct voice link connection, thereby extending service coverage to unreachable terminals while maintaining reliable audio delivery through the playing device.
3Loss of energy
If the system checks terminal availability before playing ring back tone, then it can avoid unnecessary audio playback, but it increases the complexity of the service flow
Solution Approach 1:
The patent extracts the service determination logic from the complex service flow by having the home location register independently acquire the absence response message and determine whether the called terminal has customized ring back tone service. This extracted determination step is then communicated back to the calling side mobile switching center, which simply needs to execute the predetermined action based on this information. This extraction reduces the complexity burden on the main service flow while still achieving energy efficiency by preventing unnecessary audio playback.
Data Source
AI summary
A ring back tone playing method and system, a home location register and a mobile switching center, the method comprises the calling side mobile switching center transmitting a route request message to the called side home location register when the calling side mobile switching center has received the call request transmitted from the calling terminal to the called terminal; the calling side mobile switching center receiving the ring back tone service identifier returned from the called side home location register which instructs that the called side home location register has got the called terminal's absence response message and the called terminal has customized a ring back tone service; the calling side mobile switching center instructing the playing device to play the ring back tone to the calling terminal according to the ring back tone service identifier.