Apparatus and method searching neighboring cells in wireless communication system

A method for operating a base station in a wireless communication system, the method comprising:

• transmitting, by the base station, a first set of reference signals that are transmitted through different transmission beams arranged in a first order;
• and
• transmitting a second set of the reference signals that are transmitted through different transmission beams arranged in a second order, which is different from the first order,
• wherein a part of the first set of the reference signals is received, at a terminal, during a first subframe,
• wherein a part of the second set of the reference signals is received, at the terminal, during a second subframe,
• wherein the first set of the reference signals are received, at the terminal, through a first set of different reception beams of the terminal,
• wherein the second set of the reference signals are received, at the terminal, through a second set of different reception beams of the terminal,
• wherein the first set of the reference signals comprises a first subset of the reference signals transmitted on a first frequency band and a second subset of the reference signals transmitted on a second frequency band, and
• wherein the first set of the reference signals and the second set of the reference signals are transmitted through same transmission beams in a different order.

A method for operating a terminal in a wireless communication system, the method comprising:

• determining, by the terminal, a measurement interval comprising at least one gap interval and a reference signal interval in which reference signals of a serving base station are transmitted;
• and
• receiving, during the measurement interval, reference signals that are transmitted through different transmission beams of an adjacent base station,
• wherein the at least one gap interval comprises resources that are unavailable for allocating for transmission of data to the terminal from the serving base station, and are available for allocating for transmission of data to another terminal from the serving base station, and
• wherein the at least one gap interval comprises a first gap interval which is greater than or equal to a maximum signal reception time difference with respect to at least one adjacent base station, and a second gap interval which is greater than or equal to a sum of a length of the first gap interval and a maximum reference signal interval length difference with respect to the at least one adjacent base station.

A method for operating a base station in a wireless communication system, the method comprising:

• determining, by the base station, at least one gap interval for measurement for an adjacent base station;
• and
• suspending transmission to a terminal during the at least one gap interval,
• wherein the at least one gap interval is adjacent to a reference signal interval in which reference signals of the base station are transmitted,
• wherein the at least one gap interval comprises resources that are unavailable for allocating for transmission of data to the terminal from the serving base station, and are available for allocating for transmission of data to another terminal from the serving base station, and
• wherein the at least one gap interval comprises a first gap interval which is greater than or equal to a maximum signal reception time difference with respect to at least one adjacent base station, and a second gap interval which is greater than or equal to a sum of a length of the first gap interval and a maximum reference signal interval length difference with respect to the at least one adjacent base station.

A method for operating a terminal in a wireless communication system, the method comprising:

• receiving, from a serving base station, at least one of information regarding whether a second synchronization signal of an adjacent base station is configured to be inserted between parts of a second broadcasting signal, and information regarding a separation ratio of the parts of the second broadcasting signal;
• determining, by the terminal, a measurement interval according to an interval in which first signals of the serving base station are transmitted through a first transmission beam of the serving base station;
• and
• receiving, from the adjacent base station, the second synchronization signal among second signals that is transmitted through a second transmission beam of the adjacent base station during the measurement interval,
• wherein the first signals include a first synchronization signal for measurement and a first broadcast signal,
• wherein the second signals include the second synchronization signal for measurement and the second broadcast signal,
• wherein the second synchronization signal of the adjacent base station is configured to be inserted between a first part and a second part of a second broadcasting signal of the adjacent base station, and
• wherein the first part of the second broadcasting signal, the second synchronization signal and the second part of the second broadcasting signal are adjacent in a time domain.

A method for operating a base station in a wireless communication system, the method comprising:

• transmitting, by the base station, at least one of information regarding whether a synchronization signal of an adjacent base station is configured to be inserted between parts of a broadcasting signal of the adjacent base station, and information regarding a separation ratio of the parts of the broadcasting signal of the adjacent base station;
• and
• transmitting, through different transmission beams, signals,
• wherein the signals include a synchronization signal for measurement and a broadcasting signal,
• wherein the synchronization signal is configured to be inserted between a first part and a second part of the broadcasting signal, and
• wherein the first part of the broadcasting signal, the synchronization signal and the part of the second broadcasting signal are adjacent in a time domain.

A terminal in a wireless communication system, the terminal comprising:

• a transceiver configured to receive signals of a serving base station and an adjacent base station;
• and
• at least one processor configured to control the transceiver to:
• receive, from adjacent base stations, a part of reference signals that are transmitted through different transmission beams arranged in a first order through a first set of different reception beams of the terminal, during a first measurement interval in a first frame;
• and
• receive, from the adjacent base stations, a part of reference signals of the adjacent base stations that are transmitted through different transmission beams arranged in a second order, which is different from the first order through a second set of different reception beams of the terminal, during a second measurement interval in a second frame,
• wherein the first measurement interval and the second measurement interval are determined based on intervals where reference signals of a serving base station are transmitted,
• wherein the first set of the reference signals comprises a first subset of the reference signals received on a first frequency band and a second subset of the reference signals received on a second frequency band, and
• wherein the first set of the reference signals and the second set of the reference signals are transmitted through same transmission beams in a different order.

A base station in a wireless communication system, the base station comprising:

• at least one processor configured to determine an order of transmission beams to be applied to reference signals;
• and
• a transceiver configured to:
• transmit a first set of reference signals through different transmission beams arranged in a first order, during a first frame;
• and
• transmit a second set of the reference signals through different transmission beams arranged in a second order, which is different from the first order, during a second frame,
• wherein a part of the first set of the reference signals is received, at a terminal, during the first frame,
• wherein a part of the second set of the reference signals is received, at the terminal, during the second frame,
• wherein the first set of the reference signals are received, at the terminal, through a first set of different reception beams of the terminal,
• wherein the second set of the reference signals are received, at the terminal, through a second set of different reception beams of the terminal,
• wherein the first set of the reference signals comprises a first subset of the reference signals transmitted on a first frequency band and a second subset of the reference signals transmitted on a second frequency band, and
• wherein the first set of the reference signals and the second set of the reference signals are transmitted through same transmission beams in a different order.

A terminal in a wireless communication system, the terminal comprising:

• at least one processor configured to determine a measurement interval comprising at least one gap interval and a reference signal interval in which reference signals of a serving base station are transmitted;
• and
• a transceiver configured to receive reference signals that are transmitted through different transmission beams of an adjacent base station during the measurement interval,
• wherein the at least one gap interval comprises resources that are unavailable for allocating for transmission of data to the terminal from the serving base station, and are available for allocating for transmission of data to another terminal from the serving base station, and
• wherein the at least one gap interval comprises a first gap interval which is greater than or equal to a maximum signal reception time difference with respect to at least one adjacent base station, and a second gap interval which is greater than or equal to a sum of a length of the first gap interval and a maximum reference signal interval length difference with respect to the at least one adjacent base station.

A base station in a wireless communication system, the base station comprising:

• at least one processor configured to:
• determine at least one gap interval for measurement for an adjacent base station;
• and
• suspend transmission to a terminal during the at least one gap interval,
• wherein the at least one gap interval is adjacent to an interval in which reference signals of the base station are transmitted,
• wherein the at least one gap interval comprises resources that are unavailable for allocating for transmission of data to the terminal from the serving base station, and are available for allocating for transmission of data to another terminal from the serving base station, and
• wherein the at least one gap interval comprises a first gap interval which is greater than or equal to a maximum signal reception time difference with respect to at least one adjacent base station, and a second gap interval which is greater than or equal to a sum of a length of the first gap interval and a maximum reference signal interval length difference with respect to the at least one adjacent base station.

A terminal in a wireless communication system, the terminal comprising:

• a transceiver;
• and
• at least one processor coupled to the transceiver and configured to:
• receive, from a serving base station, at least one of information regarding whether the second synchronization signal of the adjacent base station is configured to be inserted between the parts of the second broadcasting signal, and information regarding a separation ratio of the parts of the second broadcasting signal,
• determine a measurement interval according to an interval in which first signals of a serving base station are transmitted through a first transmission beam of the serving base station, and
• receive, from an adjacent base station, a second synchronization signal among second signals that is transmitted through a second transmission beam of the adjacent base station during the measurement interval,
• wherein the first signals include a first synchronization signal for measurement and a first broadcast signal,
• wherein the second signals include the second synchronization signal for measurement and a second broadcast signal,
• wherein the second synchronization signal of the adjacent base station is configured to be inserted between a first part and a second part of a second broadcasting signal of the adjacent base station, and
• wherein the first part of the second broadcasting signal, the second synchronization signal and the second part of the second broadcasting signal are adjacent in a time domain.

A base station in a wireless communication system, the base station comprising:

• a transceiver;
• and
• at least one processor coupled to the transceiver and configured to:
• transmit at least one of information regarding whether a synchronization signal of an adjacent base station is configured to be inserted between parts of a broadcasting signal of the adjacent base station, and information regarding a separation ratio of the parts of the broadcasting signal of the adjacent base station, and
• transmit, through different transmission beams, the signals,
• wherein the signals include a synchronization signal for measurement and a broadcasting signal,
• wherein the synchronization signal is configured to be inserted between a first part and a second part of the broadcasting signal, and
• wherein the first part of the broadcasting signal, the synchronization signal and the part of the second broadcasting signal are adjacent in a time domain.