System and method for session restoration at geo-redundant gateways

摘要

A method and system for managing a backup service gateway (SGW) associated with a primary SGW, comprising periodically receiving from the primary SGW at least a portion of corresponding UE session state information, the received portion of session state information being sufficient to enable the secondary SGW to indicate to an inquiring management entity that all user sessions associated with a group of mobile devices supported by the primary SGW are in a live state; and in response to a failure of the primary SGW, assuming management of IP addresses and paths associated with the primary SGW and causing each UE supported by the failed primary SGW to reauthorize itself to the network.

主权项

1. A method for managing a backup service gateway (SGW) associated with a primary SGW, the method comprising:
periodically receiving from the primary SGW at least a portion of corresponding UE session state information, the received portion of session state information being sufficient to enable the backup SGW to indicate to an inquiring management entity that UEs having an active session supported by the primary SGW are in a live state; and in response to a failure of the primary SGW, the backup SGW assuming management of IP addresses and paths associated with said primary SGW and transmitting a Downlink Data Notification (DDN) toward a Mobility Management Entity (MME) for each of said UEs having an active session supported by the failed primary SGW to detach from the network and reattach to the network, wherein each DDN causes the MME to send a detach request with a reattach request code to the respective UE.