A method of Radio Resource Control, RRC, connection resumption, implemented in a Long Term Evolution, "LTE", Radio Access Network, "RAN", for use with a mobile device, the method comprising: sending, by a first eNodeB, "eNB", of the RAN, a connection suspend command message to a mobile device, the connection suspend command message instructing the mobile device to suspend an RRC connection between the mobile device and the first eNB by: causing the mobile device to initiate a location update procedure to inform the RAN of its location only when it enters a new tracking area, causing storage of RRC connection data for the RRC connection which is being suspended between the mobile device and the first eNB, and causing release of radio resources associated with the RRC connection which is being suspended between the mobile device and the first eNB, wherein user plane communications between the mobile device and the RAN are disabled until receipt of an RRC connection resume request by the RAN from the mobile device, and wherein the mobile device is able to receive paging from the RAN while the RRC connection is suspended; and receiving, at a second eNB of the RAN, from the mobile device an RRC connection resume request message to resume the suspended RRC connection, wherein the RRC connection resume request message includes: an information element indicating reactivation of the suspended RRC connection; an identifier of the first eNB where the RRC connection was suspended; and a Short MAC-I derived using parameters relating to the first eNB. sending, by a first eNodeB, "eNB", of the RAN, a connection suspend command message to a mobile device, the connection suspend command message instructing the mobile device to suspend an RRC connection between the mobile device and the first eNB by: causing the mobile device to initiate a location update procedure to inform the RAN of its location only when it enters a new tracking area, causing storage of RRC connection data for the RRC connection which is being suspended between the mobile device and the first eNB, and causing release of radio resources associated with the RRC connection which is being suspended between the mobile device and the first eNB, wherein user plane communications between the mobile device and the RAN are disabled until receipt of an RRC connection resume request by the RAN from the mobile device, and wherein the mobile device is able to receive paging from the RAN while the RRC connection is suspended; causing the mobile device to initiate a location update procedure to inform the RAN of its location only when it enters a new tracking area, causing storage of RRC connection data for the RRC connection which is being suspended between the mobile device and the first eNB, and causing release of radio resources associated with the RRC connection which is being suspended between the mobile device and the first eNB, wherein user plane communications between the mobile device and the RAN are disabled until receipt of an RRC connection resume request by the RAN from the mobile device, and wherein the mobile device is able to receive paging from the RAN while the RRC connection is suspended; and receiving, at a second eNB of the RAN, from the mobile device an RRC connection resume request message to resume the suspended RRC connection, wherein the RRC connection resume request message includes: an information element indicating reactivation of the suspended RRC connection; an identifier of the first eNB where the RRC connection was suspended; and a Short MAC-I derived using parameters relating to the first eNB. an information element indicating reactivation of the suspended RRC connection; an identifier of the first eNB where the RRC connection was suspended; and a Short MAC-I derived using parameters relating to the first eNB.