Evolved packet system (eps) mobility configuration from wireless system

A method of wireless communication, comprising:

• generating, by a first network entity, a mapped Evolved Packet System (EPS) security context associated with a request for an intersystem change of a user equipment (UE) from a wireless system to an EPS, wherein the mapped EPS security context includes security parameters created based on a security context used for the wireless system, the security parameters enabling security-related communications between the UE and a second network entity;
• determining a downlink (DL) non-access stratum (NAS) COUNT value and an uplink (UL) NAS COUNT value for the mapped EPS security context;
• and
• transmitting, by the first network entity, the mapped EPS security context with the DL NAS COUNT value to the second network entity.

A user equipment (UE) for wireless communication, comprising:

• a transceiver;
• a memory configured to store instructions;
• and
• one or more processors communicatively coupled with the transceiver and the memory, wherein the one or more processors are configured to execute the instructions to:
• generating a mapped Evolved Packet System (EPS) security context associated with an intersystem change of the UE from a wireless system to an EPS, wherein the mapped EPS security context comprises security parameters created based a security context used for the wireless system, the security parameters enabling security-related communications between the UE and a network entity;
• determining an uplink (UL) non-access stratum (NAS) COUNT value and downlink (DL) NAS COUNT value for the mapped EPS security context;
• and
• transmitting a NAS message to the network entity, the NAS message including the UL NAS COUNT value of the mapped EPS security context.

A network entity for wireless communication, comprising:

• a transceiver;
• a memory configured to store instructions;
• and
• one or more processors communicatively coupled with the transceiver and the memory, wherein the one or more processors are configured to execute the instructions to:
• generate a mapped Evolved Packet System (EPS) security context associated with a request for an intersystem change of a user equipment (UE) from a wireless system to an EPS, wherein the mapped EPS security context includes security parameters created based a security context used for the wireless system, the security parameters enabling security-related communications between the UE and a second network entity;
• determine a downlink (DL) non-access stratum (NAS) COUNT value and an uplink (UL) NAS COUNT value for the mapped EPS security context;
• and
• transmit the mapped EPS security context with the DL NAS COUNT value to the second network entity.