A method of radio resource control, RRC, connection resumption implemented in a mobile device for use with a Long Term Evolution "LTE" Radio Access Network "RAN", comprising: the mobile device sending an indicator to the RAN in respect of an RRC connection with the RAN, wherein the indicator indicates that the mobile device is configured to support an RRC connection suspension; the mobile device receiving a command message from an eNodeB of the RAN to suspend the RRC connection; the mobile device, in response to receiving the command message, suspending the RRC connection, wherein suspending the RRC connection comprises: the mobile device storing RRC connection data related to the RRC connection which is being suspended,the mobile device releasing radio resources associated with the RRC connection which is being suspended between the mobile device and the RAN, wherein the mobile device is able to receive paging from the RAN while the RRC connection is suspended, and wherein, while the RRC connection is suspended, the mobile device initiates location updating only when it enters a new tracking area; and the mobile device sending an RRC connection resume request message to the RAN to resume the suspended RRC connection, wherein the RRC connection resume request message includes: an information element indicating reactivation of the suspended connection; an identifier of the eNodeB where the RRC connection was suspended; a Short MAC-I derived using parameters relating to the eNodeB where the RRC connection was suspended. the mobile device sending an indicator to the RAN in respect of an RRC connection with the RAN, wherein the indicator indicates that the mobile device is configured to support an RRC connection suspension; the mobile device receiving a command message from an eNodeB of the RAN to suspend the RRC connection; the mobile device, in response to receiving the command message, suspending the RRC connection, wherein suspending the RRC connection comprises: the mobile device storing RRC connection data related to the RRC connection which is being suspended,the mobile device releasing radio resources associated with the RRC connection which is being suspended between the mobile device and the RAN, wherein the mobile device is able to receive paging from the RAN while the RRC connection is suspended, and wherein, while the RRC connection is suspended, the mobile device initiates location updating only when it enters a new tracking area; and the mobile device storing RRC connection data related to the RRC connection which is being suspended,the mobile device releasing radio resources associated with the RRC connection which is being suspended between the mobile device and the RAN, wherein the mobile device is able to receive paging from the RAN while the RRC connection is suspended, and wherein, while the RRC connection is suspended, the mobile device initiates location updating only when it enters a new tracking area; and the mobile device sending an RRC connection resume request message to the RAN to resume the suspended RRC connection, wherein the RRC connection resume request message includes: an information element indicating reactivation of the suspended connection; an identifier of the eNodeB where the RRC connection was suspended; a Short MAC-I derived using parameters relating to the eNodeB where the RRC connection was suspended. an information element indicating reactivation of the suspended connection; an identifier of the eNodeB where the RRC connection was suspended; a Short MAC-I derived using parameters relating to the eNodeB where the RRC connection was suspended.