Link failure detection and interworking system relocation in circuit switched fallback
US8964698B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Jul 16, 2012 |
| Grant date | Feb 24, 2015 |
| Priority date | — |
| Expiry date | May 16, 2033 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04W76/22
- WIPO fieldDigital communication
- WIPO sectorElectrical engineering
Abstract
A method and mechanism to detect failure of an S102 link between an Evolved Packet Core, EPC, network based Mobility Management Entity, MME, and an Interworking System, IWS, in a Mobile Switching Center, MSC, pool deploying Circuit Switched Fallback, CSFB, for the EPC network. A heartbeat message exchange between an MME-IWS pair augments the current standards to provide a simple and direct method to monitor the application layer status of the S102 link between the EPC-based MME and the MSC pool-based IWS. Upon detecting a link failure, message flows can be quickly re-routed to another S102 link or MSC. Reverse use of an A21 Event Notification message from an IWS to MME, or a re-assigned IWS's delayed acknowledgement of an initial call-related message from an MME also augment the current standards to address IWS relocation related message-bouncing in MSC pool-based deployments of CSFB, thereby allowing efficient routing of messages.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.