A method and apparatus for accessing a random access channel (RACH) during handover are disclosed. A handover procedure is initiated and a maximum handover interruption timer is activated. A dedicated preamble is transmitted in an attempt to access the RACH on a condition that the dedicated preamble is reserved in a current random access opportunity and the maximum handover interruption timer has not expired. A contention-based preamble is transmitted in an attempt to access the RACH on a condition that a dedicated preamble is not reserved in a current random access opportunity. If the maximum handover interruption timer has expired, a contention-based preamble is transmitted in an attempt to access the RACH.

A data transmission control method, apparatus and system are provided. A radio communication node receives a data packet sent by a base station, where the data packet is generated by using a Packet Data Convergence Protocol protocol data unit (PDCP PDU) of the base station. The radio communication node acquires the PDCP PDU, which is used as a Radio Link Control service data unit (RLC SDU), in the data packet. The radio communication node sends data generated by using the RLC SDU to a user equipment, where a user plane connection is established between the radio communication node and the user equipment, and a control plane connection is established between the base station and the user equipment.

The application provides a handover processing method and a base station. The method includes: receiving a handover request message sent by a source base station or a core network node; sending a first message, according to the handover request message, to a second target base station to notify the second target base station that a handover of part or all of a service of a user equipment to the second target base station is to be performed; and sending a handover request acknowledge message to the source base station or the core network node to notify the source base station or the core network node to hand over the user equipment to at least one target cell of the first target base station and/or at least one target cell of the second target base station. The present application realizes a multi-cell handover.

Methods and systems for a traffic control system provide arrangements and processes for managing automated vehicles. The traffic control system can register vehicles and then control the operation of the vehicles through a section of roadway. The automated control includes the communication of directions and other messages that ensure the proper function of the vehicle while under the guidance of the traffic control system.

A method includes optimizing a handover behavior of a mobile radio communication network including at least a first base station and a second base station. The method includes (a) performing a handover of a UE from the first base station to the second base station; (b) adding an information element representing a property of the UE to a report message including information about the performed handover; (c) forwarding the report message from the second base station to the first base station; and (d) optimizing the handover behavior of the mobile radio communication network based on the added information element. Further, it is described a base station which is configured for carrying out the described handover behavior optimization method.

A multi-mode mobile station includes a first interface for communicating with a first wireless network, such as a wireless wide area network (WWAN), and a second interface for communicating with a second wireless network, such as a wireless local area network (WLAN). While the multi-mode mobile station has a first connection with the first wireless network, the multi-mode mobile station establishes a second connection with the second wireless network. When the second connection is established, the second wireless network transmits an acknowledgement signal to the multi-mode mobile station. In response to the acknowledgment signal, the multi-mode mobile station disables the first connection with the first wireless network and powers down the first interface.

Some demonstrative embodiments include devices, systems and/or methods of Lawful Interception (LI). For example, a device may communicate a message addressed to an Evolved Node B (eNB) over a cellular communication core network, the message including a Lawful Interception (LI) Information Element (IE) indicating that content corresponding to one or more User Equipment (UEs) connected to the eNB is to be subject to LI.

This invention provides a method, system and apparatus for controlling mobility on a wireless network, which includes retrieving a network mobility preference, the network mobility preference indicating a level of mobility service for the mobile station, the level of mobility service indicating the extent to which the mobile station can handoff among base stations of the wireless network, and establishing a level of mobility service for the mobile station based on the retrieved network mobility preference. The method and apparatus may further include determining the level of mobility service for the mobile station to be fully or partially restricted based on the mobility preference.

A synchronization method and a device in a communications network are provided. A control node obtains information about a time difference between at least one group of two adjacent network nodes in a to-be-synchronized area; determine, according to the information about the time difference between the two adjacent network nodes, a time adjustment value that needs to be used when a to-be-synchronized network node in the to-be-synchronized area is synchronized with a selected reference node; and send the determined time adjustment value to the to-be-synchronized network node, so that the to-be-synchronized network node adjusts time of the to-be-synchronized network node according to the corresponding time adjustment value. The control node is used to implement synchronization control on network nodes in the to-be-synchronized area. This solution is easy to implement, and reduces costs because there is no need to install GPS on each network node.

A communication device for handling a handover 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 receiving a handover command via a radio resource control (RRC) connection on a first cell from a first base station (BS); synchronizing to a downlink (DL) of a second cell indicated in the handover command; transmitting a handover complete message to the second cell in response to the handover command without performing a random access (RA) procedure to the second cell, if the handover command indicates no need to perform the RA procedure to the second cell; and determining that the handover is successful, when detecting a Radio Network Temporary Identifier (RNTI) on a DL channel from the second cell in a first time period.