Mobile operators prefer deploying user plane functions (UPFs) in an N:M redundancy model due to the resulting cost benefits and operational simplicity. However, N:M deployed UPFs can incur lengthy failover times (resulting in extended service disruptions). Hence, operators usually deploy UPFs using different redundancy models depending upon the service level agreements (SLAs) that are required by different types of services – for example, a 1:1 redundancy model for Internet Protocol (IP) Multimedia Subsystem (IMS), emergency calls, enterprise services, etc. and a N:M redundancy model for data and internet services. Techniques are presented herein that address these challenges by adopting a hybrid approach in which session pre-allocation may be employed for active sessions and session restoration may be employed for idle sessions. Such a hybrid approach reduces the perceived outage for active sessions to a level that is comparable to what may be achieved through a 1:1 redundancy model, thus making such a hybrid approach suitable for supporting all types of services and SLAs.
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Jaya, Sanjeev Panem and Pant, Dhirendra, "MECHANISM FOR ACHIEVING FAST FAILOVER OF 5G USER PLANE FUNCTIONS DEPLOYED IN AN N:M HOT-STANDBY MODE", Technical Disclosure Commons, (October 28, 2020)