MME Voice Resource Saving in LTE CSFB Handover
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Solution Overview
Problem
In current communications networks, the handover from LTE to 2G or 3G networks for voice services can cause voice call interruptions due to different bearer mechanisms, leading to resource wastage during circuit switched fallback (CSFB) for non-voice services.
Innovation Solution
A method that prevents the handover of UE from LTE to the CS domain of 2G or 3G networks for non-voice services, and when handover occurs, it releases reserved voice resources in the CS domain, by using a notification message from the MME to the eNodeB and subsequent bearer release messages.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If handover from LTE to CS domain is performed for non-voice services, then service compatibility is improved, but voice resources are wasted
Solution Approach 1:
The MME performs preliminary judgment on the service type before initiating handover. When a paging request arrives, the MME checks whether it is for a voice service or non-voice service in advance, and only initiates CS domain handover for voice services, thereby avoiding unnecessary voice resource allocation for non-voice services
Solution Approach 2:
The patent applies partial action by selectively performing handover only for voice services rather than all services. The MME identifies voice services through indication information in paging requests and selectively triggers CSFB handover only when necessary, avoiding excessive handover actions for non-voice services
2Adaptability or versatility
If handover from LTE to CS domain is performed, then voice service support is improved, but call continuity is deteriorated
Solution Approach 1:
The patent extracts the voice service handling function from the general service handling process. By identifying voice services through specific indication information and separating them from non-voice services, the system applies CSFB handover only to voice services, maintaining call continuity while supporting voice services
Solution Approach 2:
The MME performs preliminary identification of voice services before handover using indication information in paging requests. This preliminary action ensures that only voice services trigger CS domain handover, preventing call interruptions for voice calls while allowing non-voice services to remain in LTE
Data Source
AI summary
The present invention discloses a voice resource saving method, including: an MME sends a notification message to an eNodeB, which is used to instruct the eNodeB not to hand over, for a non-voice service, a UE from a LTE network to a CS domain of a 2G or a 3G network. Or, when an MSC determines that the circuit domain service is a non-voice service, the MSC sends a bearer release message to a base station to instruct the base station to release the voice resource. According to the the present invention, during implementation of a non-voice service, a handover of UE from an LTE network to a CS domain of a 2G or 3G network may not be triggered, or a voice resource reserved in the CS domain of the 2G or 3G network is released.