Apparatus and method for base station cooperative communication in wireless communication system

A method for base station (BS) cooperative communication in a wireless communication system supporting downlink beam forming, the method comprising:

• receiving, by a serving BS, a measurement report indicating signal measurements of the serving BS and one or more neighboring BSs from a mobile station (MS);
• determining, by the serving BS, a number of beams available for communication between the serving BS and the MS;
• determining, by the serving BS, at least one neighboring BS to be joined in the BS cooperative communication for the MS based on the number of beams available;
• instructing the MS to switch a single cell mode to a BS cooperative communication mode, if the number of beams available is smaller than a first value and at least one neighboring BS has a signal measurement larger than a first threshold while the MS operates in the single cell mode;
• and
• performing the BS cooperative communication.

An apparatus of a mobile station (MS) for performing base station (BS) cooperative communication in a wireless communication system, the apparatus comprising:

• a transceiver configured to transmit and receive signals;
• a processor;
• and
• a memory storing one or more computer programs configured to be executed by the processor, the one or more computer programs including instructions to:
• measure signal qualities of a serving BS and one or more neighboring BSs,
• determine a number of beams available for communication between the serving BS and the MS,
• determine at least one neighboring BS to be joined in the BS cooperative communication for the MS based on the nunber of beams available,
• request for switching a single cell mode to a BS cooperative communication mode to the serving BS, if the number of beams available is smaller than a first value and at least one neighboring BS has a signal measurement larger than a first threshold while the MS operates in the single cell mode, and
• perform the BS cooperative communication, in response to receiving a response from the serving BS granting the request for switching the single cell mode to the BS cooperative communication mode.

A base station (BS) apparatus performing BS cooperative communication in a wireless communication system supporting downlink beam forming, the BS apparatus comprising:

• a transceiver configured to receive a measurement report indicating signal measurements of a serving BS and one or more neighboring BSs from a mobile station (MS);
• and
• a processor configured to:
• determine a number of beams available for communication between the serving BS and the MS,
• determine at least one neighboring BS to be joined in the BS cooperative communication for the MS based on the number of beam avaialble,
• instruct the MS to switch a single cell mode to a BS cooperative communication mode, if the number of beams available is smaller than a first value and at least one neighboring BS has a signal measurement larger than a first threshold while the MS operates in the single cell mode, and
• perform the BS cooperative communication.