One or more non-transitory computer-readable media comprising instructions to cause a user equipment, UE, upon execution of the instructions by one or more processors of UE, to perform the following: transmitting an attach request message to a mobility management entity, MME, wherein the attach request message comprises: an indication to the MME that the UE supports an Evolved Packet System, EPS, Mobility Management, EMM, state EMM-REGISTERED without Packet Data Network, PDN, connection, and an Evolved Packet System, EPS, Session Management, ESM, Dummy Message that indicates to the MME that the UE requests attach to the network without establishment of a PDN connection; and receiving an attach accept message transmitted from the MME, wherein the attach accept message comprises: an indication to the UE that the MME supports the EMM state EMM-REGISTERED without PDN connection, and an ESM Dummy Message that indicates to the UE that the MME accepts a request of the UE to attach to the network without establishment of PDN connectivity, wherein the ESM Dummy Message consists of: a field for indicating a protocol discriminator; a field for indicating an EPS bearer identity; a field for indicating a procedure transaction identity; and a field for indicating an ESM Dummy Message identity. transmitting an attach request message to a mobility management entity, MME, wherein the attach request message comprises: an indication to the MME that the UE supports an Evolved Packet System, EPS, Mobility Management, EMM, state EMM-REGISTERED without Packet Data Network, PDN, connection, and an Evolved Packet System, EPS, Session Management, ESM, Dummy Message that indicates to the MME that the UE requests attach to the network without establishment of a PDN connection; and an indication to the MME that the UE supports an Evolved Packet System, EPS, Mobility Management, EMM, state EMM-REGISTERED without Packet Data Network, PDN, connection, and an Evolved Packet System, EPS, Session Management, ESM, Dummy Message that indicates to the MME that the UE requests attach to the network without establishment of a PDN connection; and receiving an attach accept message transmitted from the MME, wherein the attach accept message comprises: an indication to the UE that the MME supports the EMM state EMM-REGISTERED without PDN connection, and an ESM Dummy Message that indicates to the UE that the MME accepts a request of the UE to attach to the network without establishment of PDN connectivity, an indication to the UE that the MME supports the EMM state EMM-REGISTERED without PDN connection, and an ESM Dummy Message that indicates to the UE that the MME accepts a request of the UE to attach to the network without establishment of PDN connectivity, wherein the ESM Dummy Message consists of: a field for indicating a protocol discriminator; a field for indicating an EPS bearer identity; a field for indicating a procedure transaction identity; and a field for indicating an ESM Dummy Message identity. a field for indicating a protocol discriminator; a field for indicating an EPS bearer identity; a field for indicating a procedure transaction identity; and a field for indicating an ESM Dummy Message identity.