A machine type communications, MTC, device configured to implement an uplink stack reduction, USR, feature with a serving node, the MTC device comprising: a processor; and, at least one memory that stores processor-executable instructions, wherein the processor interfaces with the at least one memory to execute the processor-executable instructions, whereby said MTC device is operable to: receive a message (108, 118) from the serving node when activating a Packet Data Protocol, PDP, context with the serving node, wherein the message comprises an indication which indicates that the serving node supports the USR feature; send, to the serving node, a Sub Network Protocol Data Unit, SN-PDU, having a payload comprising User Datagram Protocol/Internet Protocol, UDP/IP, layers, wherein the SN-PDU is associated with the PDP context with the serving node; enable the USR feature for the PDP context with the serving node; store status information indicating the USR feature is enabled for the PDP context with the serving node; and, send, to the serving node, a subsequent SN-PDU (112 1) having a payload which excludes UDP/IP layers, wherein the subsequent SN-PDU is associated with the PDP context with the serving node, wherein the subsequent SN-PDU further comprises a header with a field which indicates that the UDP/IP layers have been excluded therefrom. a processor; and, at least one memory that stores processor-executable instructions, wherein the processor interfaces with the at least one memory to execute the processor-executable instructions, whereby said MTC device is operable to: receive a message (108, 118) from the serving node when activating a Packet Data Protocol, PDP, context with the serving node, wherein the message comprises an indication which indicates that the serving node supports the USR feature; send, to the serving node, a Sub Network Protocol Data Unit, SN-PDU, having a payload comprising User Datagram Protocol/Internet Protocol, UDP/IP, layers, wherein the SN-PDU is associated with the PDP context with the serving node; enable the USR feature for the PDP context with the serving node; store status information indicating the USR feature is enabled for the PDP context with the serving node; and, send, to the serving node, a subsequent SN-PDU (112 1) having a payload which excludes UDP/IP layers, wherein the subsequent SN-PDU is associated with the PDP context with the serving node, wherein the subsequent SN-PDU further comprises a header with a field which indicates that the UDP/IP layers have been excluded therefrom. receive a message (108, 118) from the serving node when activating a Packet Data Protocol, PDP, context with the serving node, wherein the message comprises an indication which indicates that the serving node supports the USR feature; send, to the serving node, a Sub Network Protocol Data Unit, SN-PDU, having a payload comprising User Datagram Protocol/Internet Protocol, UDP/IP, layers, wherein the SN-PDU is associated with the PDP context with the serving node; enable the USR feature for the PDP context with the serving node; store status information indicating the USR feature is enabled for the PDP context with the serving node; and, send, to the serving node, a subsequent SN-PDU (112 1) having a payload which excludes UDP/IP layers, wherein the subsequent SN-PDU is associated with the PDP context with the serving node, wherein the subsequent SN-PDU further comprises a header with a field which indicates that the UDP/IP layers have been excluded therefrom.