A method of operating a target base station in a wireless communication network to determine an addressing information for a source base station. A method to operate a target base station in a wireless communication network includes receiving a connection request message from a terminal, transmitting, to the terminal, a terminal information request message, and receiving, from the terminal, a terminal information response message including source base station information in response to the terminal information request message.

A communication system is presented in which a base station operates a each of a plurality of cells using a respective component carrier. When the base station decides to configure a mobile telephone to use additional cells of the plurality of cells, a access control procedure is initiated to determine for each cell whether the configuration should be allowed.

A device that identifies entry into a new service area, transmits a service area update request to a network device associated with a network, receives a control plane message from the network indicating control plane device relocation or a key refresh due to a service area change in response to transmitting the service area update request, and derives a first key based in part on data included in the control plane message and a second key shared between the device and a key management device. Another device that receives a handover command from a network device associated with a network, the handover command indicating a new service area, derives a first key based on data included in the handover command and on a second key shared between the device and a key management device, and sends a handover confirmation message that is secured based on the first key.

Provided are a communication method carried out by a terminal in a wireless communication system and a terminal utilizing the method. The method comprises the steps of: determining whether a second terminal is to act as a proxy for a mobility related procedure for a first terminal; and on the basis of the determination, entering into a reduced power mode, wherein, in the reduced power mode, a procedure associated with a handover of the first terminal may not be carried out or be carried out with low frequency.

A method for a handover of a mobile station performed by a source base station and a target base station. The target base station receives a handover request message, from the source base station, in which includes QoS information of the mobile device, radio bearer identifier information of the source base station, and a first mapping relationship between a flow and a radio bearer of the source base station, the target base station acknowledges with a handover acknowledgement message. Therefore resource preparation at the target base station during a handover procedure is improved.

A first communication device for communicating with a second communication device according to a Cellular network/wireless local area network (WLAN) Radio Level Integration with Internet Protocol Security (IPsec) Tunnel (CWIP) comprises a storage device for storing instructions and a processing circuit coupled to the storage device. The processing circuit is configured to execute the instructions stored in the storage device. The instructions comprise performing a CWIP configuration and a CWIP aggregation configuration; transmitting a plurality of CWIP Encapsulation Protocol (CWIPEP) protocol data units (PDUs) over a radio bearer (RB) via a cellular connection or a WLAN to the second communication device, in response to the CWIP configuration and the CWIP aggregation configuration; performing a radio resource control (RRC) connection reestablishment or a handover; and stopping transmitting any CWIPEP PDU over the RB to the second communication device, after completing the RRC connection reestablishment or the handover.

The present disclosure relates to a communication method and system for converging a 5th-Generation (5G) communication system for supporting higher data rates beyond a 4th-Generation (4G) system with a technology for Internet of Things (IoT). The present disclosure may be applied to intelligent services based on 5G communication technology and IoT-related technology, such as smart home, smart building, smart city, smart car, connected car, health care, digital education, smart retail, security and safety services. A handover method of a terminal in a mobile communication system according to the present disclosure includes transmitting UE capability information including a random access-free handover indicator to a first base station, receiving a handover command message from the first base station, and transmitting, when the handover command message includes uplink resource information, a handover complete message to a second base station based on the uplink resource information.

The present disclosure relates to a communication method and system for converging a 5th-Generation (5G) communication system for supporting higher data rates beyond a 4th-Generation (4G) system with a technology for Internet of Things (IoT). The present disclosure may be applied to intelligent services based on 5G communication technology and IoT-related technology, such as smart home, smart building, smart city, smart car, connected car, health care, digital education, smart retail, security and safety services. A handover method of a terminal in a mobile communication system according to the present disclosure includes transmitting UE capability information including a random access-free handover indicator to a first base station, receiving a handover command message from the first base station, and transmitting, when the handover command message includes uplink resource information, a handover complete message to a second base station based on the uplink resource information.

An apparatus of a base station (BS) of a radio access network (RAN) comprises memory and processing circuitry. The processing circuitry includes a central unit (CU) portion and a distributed unit (DU) portion that implement a BS multi-layer protocol stack divided between the CU portion and the DU portion. The processing circuitry initiates a handover to change a serving cell of user equipment (UE). The handover includes a change in a portion of logical layers of the BS multi-layer protocol stack, and the processing circuitry encodes an information element for transmission to the UE indicating logical layers of a UE multi-layer protocol stack implemented in the UE to be reset by the UE in association with the handover.

A wireless device may communicate via one or more cells. Cell switching may cause the wireless device to switch from communicating via a serving cell to communicating via a target serving cell. Information for triggering a random access via a candidate serving cell may indicate to acquire early time alignment for the candidate serving cell. The information may indicate whether or not to monitor a channel for a response to a preamble transmission to the candidate serving cell.