Patent ID: 11877202
Assignee: T-MOBILE USA, INC.
Field: Digital communication (Electrical engineering)
Classification: CPC H | IPC H

Claim 4:
5. A computer-readable storage medium, excluding transitory signals and carrying instructions, which, when executed by at least one data processor of a system, cause the system to:
receive a communication indicating a request by user equipment (UE) to transfer from a communication session with an eNodeB (eNB) associated with a 4th Generation Long-Term Evolution (4G LTE) telecommunications network to a communication session with a gNodeB (gNB) associated with a 5th Generation New Radio (5G NR) telecommunications network,
wherein the UE is operating in an active data session when the request to transfer is received, and
wherein the UE is assigned an Internet protocol version 4 (IPv4) address to enable communications by the UE in a packet data network (PDN) session within the 4G LTE telecommunications network;

transmit to an accessibility and mobility management function (AMF) associated with a 5G New Radio (NR) network, a relocation request associated with the UE that does not include the IPv4 address, the relocation request causing the AMF to notify the UE that the IPv4 PDN session is inactive and to facilitate initiation of an IP version 6 (IPv6) PDN session with a core network of the 5G NR network; and
release the IPv4 address assigned to the UE.