A radio base station that performs radio communication with a mobile station in a cell and that includes: resource management unit that secures resources necessary for radio communication with the mobile station; and communication control unit that, in accordance with a reconnection request from the mobile station, uses the resources secured by the resource management unit to perform reconnection control for establishing radio communication with the mobile station. If a reconnection request is received from the mobile station that takes another radio base station as the connection source in a state in which resources have not been secured by resource management unit, communication control unit interrupts the reconnection control, executes handover with the other base station in order to switch the connection destination of the mobile station from the other base station to its own base station, causes resource management unit to secure resources, and then resumes the reconnection control.

A first base station provides radio communication service to user equipments, UEs, and a second base station that provides radio communication service to UEs in adjacent cell service area. The first base station receives cell range expansion, CRE, information from the second base station for expanding the size of the first cell and evaluates handover of one or more UEs with respect to the second cell based on the CRE information. In one embodiment, the second base station determines a CRE related configuration that includes the CRE information with respect to the first cell, sends the CRE information to the first base station. For example, the second base station may send a handover request including the CRE information to the first base station. The second base station also may consider CRE information in handover evaluation.

Disclosed are: a method for providing continuity of a multimedia broadcast multicast service (MBMS) service, and a device supporting the same. The method may include: entering a radio resource control (RRC) connected state with respect to a first cell; receiving MBMS-related system information from the first cell; determining whether a mobility condition for continuity of an MBMS service is satisfied based on the received system information; and entering an RRC idle state when it is determined that the mobility condition is satisfied, and the UE does not supports a handover operation.

Provided are methods and apparatuses for controlling the mobility of a user equipment for performing mobile communication network-based Vehicle To Everything (V2X). For example, a handover method may be provided for a user equipment for performing Vehicle To Everything (V2X) communication. The handover method may includes receiving synchronization type information for the V2X communication from a source base station, and configuring a synchronization type, receiving, from the source base station, handover command information including resource configuration information for the V2X communication which is configured by a target base station; and performing the V2X communication until completion of a handover to the target base station by using the resource configuration information.

Various apparatuses and procedures for applying cell reselection priorities in a wireless transmit/receive unit (WTRU) are described. A method includes receiving a message including first cell reselection priorities assigned to a first plurality of frequencies and a validity timer associated with the first cell reselection priorities, where the validity timer indicates a length of time the first cell reselection priorities are valid, starting the validly timer based on the received message, performing a cell reselection evaluation using the first cell reselection priorities, and, on a condition that the validity timer expires, deleting the first cell reselection priorities, applying second cell reselection priorities assigned to a second plurality of frequencies, and performing a cell reselection evaluation using the second cell reselection priorities.

Embodiments of the present application provide a method and an apparatus for determining a state of a terminal device. The method includes: the terminal device determines an amount of data to be sent; and the terminal device determines, according to the amount of data to be sent, a state in which the terminal device needs to be. According to the embodiments of the present application, unnecessary state switching can be avoided for the terminal device, signaling overhead can be reduced, and power consumption of the terminal device can be reduced, thereby improving system efficiency.

The invention relates to an improved handover procedure for a mobile terminal. Under control of the target base station, the mobile terminal is to perform a handoff to a target base station, wherein it is to be configured for communication with the target base station via a target radio cell comprising a downlink carrier and an uplink carrier. The mobile terminal receives a handoff command message for the handoff to the target base station including a handoff execution condition as trigger for executing handoff to the target base station. Then, the mobile terminal determines, based on the received handoff execution condition, whether or not the mobile terminal is to trigger execution of the handoff to the target base station. In case the mobile terminal determines that it is to trigger execution of the handoff to the target base station, the mobile terminal executes the handoff to the target base station.

An approach of handling interference caused by inter-modulation in a network node for wireless communication capable of communication with a set of stations for wireless communication is disclosed. The stations are wireless transceiver devices and communication from the network node to any of the stations is considered to be downlink communication performed on a downlink carrier in a downlink carrier frequency band and communication from any of the stations is considered to be uplink communication performed on an uplink carrier in an uplink carrier frequency band. The method comprises, when an interference level indicates probable inter-modulation interference, scheduling uplink transmission grants for a plurality of stations of a subset of the stations within a time interval, such that scheduling outside the time interval is reduced. The uplink transmission grants are valid for the time interval, wherein the scheduling uplink transmission grants is performed by adapting a schedule for at least one station of the plurality of stations of the subset of the stations to fall within the time interval. The method further comprises transmitting the uplink transmission grant to the plurality of stations of the subset of stations, assigning limited transmissions on the downlink carrier frequency band at the time interval such that inter-modulation interference is reduced on the uplink carrier frequency band during the time interval, and assigning transmissions on the downlink carrier frequency band outside the time interval with less limitations than during the time interval. The approach comprises methods, network nodes, computer programs and network node sites.

A transmission method, a base station, and a terminal. The method includes sending, by a source base station, a handover command to a terminal, where the handover command triggers a process of handing over the terminal from the source base station to a target base station, and the source base station maintains user data transmission with the terminal, and, in the handover process, when maintaining of the user data transmission between the source base station and the terminal is stopped, sending, by the source base station, a first status report to the terminal, where the first status report indicates, to the terminal, a status of receiving uplink data of the terminal by the source base station.

A communication control method in a relay station that holds a donor base station list, is connected to a donor base station existing on the donor base station list, and performs relay transmission between the donor base station and a user terminal, comprises a step A of designating a neighboring base station, a step B of inquiring the neighboring base station designated in the step A of whether to accept or refuse the relay station, and a step C of updating the donor base station list in response to an inquiry result in the step B.