Method and apparatus for establishing synchronization and transmitting/receiving signal in beamforming system

A method of communicating with a base station by a mobile station in a communication system, the method comprising:

• receiving, by a mobile station, a plurality of downlink signals transmitted through a plurality of downlink beam pairs, each downlink beam pair including a transmission beam and a reception beam;
• determining, by the mobile station, a signed strength for each of the plurality of downlink signals;
• selecting, by the mobile station, a predetermined number of downlink signals having a in order of strongest signal strength among the plurality of downlink signals;
• performing, by the mobile station, an operation using frame boundaries of the predetermined number of downlink signals;
• and
• determining, by the mobile station, a value of the operation as the frame boundary of the mobile station,
• wherein the predetermined number is an integer larger than 1.

A method of determining a timing advance (TA) value for an uplink transmission time of a mobile station by a base station in a communication system, the method comprising:

• receiving, by the base station, a plurality of uplink signals transmitted through a plurality of uplink beam pairs, each uplink beam pair including a reception beam and a transmission beam;
• determining, by the base station, at least one of a propagation delay and a signal strength for each of the plurality of uplink signals;
• selecting, by the base station, at least one uplink signal among the plurality of uplink signals based on the at least one of the propagation delay and the signal strength for each of the plurality of uplink signals;
• and
• determining, by the base station, based on the selected at least one uplink signal.

A mobile station, comprising:

• a transceiver configured to receive a plurality of downlink signals transmitted through a plurality of downlink beam pairs including a transmission beam and a reception beam;
• and
• a controller configured to:
• determine a propagation delay for each of the plurality of downlink signals,
• select at least one downlink signal among the plurality of downlink signals based on the propagation delay for each of the plurality of downlink signals, and
• determine a downlink frame boundary of the mobile station based on the selected at least one downlink signal.

A mobile station, comprising:

• a transceiver configured to receive a plurality of downlink signals transmitted through a plurality of downlink beam pairs, each downlink beam pair including a transmission beam and a reception beam;
• and
• a controller configured to:
• determine a signal strength for each of the plurality of downlink signals,
• select a predetermined number of downlink signals in order of strongest signal strength among the plurality of downlink signals,
• perform an operation using frame boundaries of the predetermined number of downlink signals, and
• determine a value of the operation as a frame boundary of the mobile station,
• wherein the predetermined number is an integer larger than 1.

A base station, comprising:

• a transceiver configured to receive a plurality of uplink signals transmitted through a plurality of uplink beam pairs, each uplink beam pair including a transmission beam and a reception beam;
• and
• a controller configured to:
• determine at least one of a propagation delay and a signal strength for each of the plurality of uplink signals,
• select at least one uplink signal among the plurality of uplink signals based on the at least one of the propagation delay and the signal strength for each of the plurality of uplink signals, and
• determining the TA value based on the selected at least one uplink signal.