Method and apparatus for handover

A method for handover in a network environment in which a plurality of beams are provided within a base station, the method comprising:

• receiving, by a base station, a first measurement report message including information on a target beam that satisfy a first condition from a terminal;
• allowing, by the base station, inter-beam coordinated scheduling (IBCS) in which transmitting/receiving data through a serving beam and a target beam for the IBCS is performed, including
• designating target beams in which a difference between a reference signal received power (RSRP) the serving beam and a RSRP of each of the target beans is less than a first offset as candidate beams for the IBCS;
• determining whether to accept an amount of resources required by the terminal based on a remaining amount of resources minus average resource usage from a total amount of resources for each of the candidate beams;
• and
• approving a candidate beam as the target beam for the IBCS when it is possible to accept the candidate beam;
• receiving, by a base station, a second measurement report message representing that the target beam for the IBCS satisfies a second condition from a terminal;
• and
• transmitting, by the base station, a message for commanding handover to the target beam for the IBCS to the terminal when the second condition is satisfied, wherein
• the first condition represents that the signal strength of the serving beam is greater than the signal strength of the target beam by a first offset, and
• the second condition represents that the signal strength of the target beam is maintained greater than the signal strength of the serving beam by a second offset during a predetermined time.

An apparatus for handover to perform handover between beams by a terminal in a network environment in which a plurality of beams are provided within a base station, the apparatus comprising:

• a signal strength measuring processer for measuring signal strength of a serving beam and signal strength of a target beam;
• a measurement report message transmission determining processer for generating a first measurement report message and transmitting it to the base station when the signal strength of the serving beam and the signal strength of the target beam satisfy a first condition or a second condition;
• a handover command receiver for receiving a message commanding handover from the base station;
• and
• a handover performing processer for performing handover from the serving beam to a target beam corresponding to an identifier of a target beam included in the message commanding handover, wherein
• the first condition represents that the signal strength of the serving beam is greater than the signal strength of the target beam by a first offset,
• the second condition represents that the signal strength of the target beam is maintained greater than the signal strength of the serving beam by a second offset during a predetermined time,
• the measurement report message transmission processer generates and transmits a second measurement report message when the second condition is satisfied in a state in which inter-beam coordinated scheduling (IBCS) of transmitting/receiving data through a serving beam and a target beam is performed after transmitting a first measurement report message when the first condition is satisfied.