Method and apparatus for transmitting a signal for a location based-service in a wireless communication system, and method and apparatus for locating a terminal that uses the signal
The present invention relates to a wireless communication system. In particular, for the transmission of a locating zone configured across one or more superframes for transmitting a locating synchronizing signal for determining the location of a terminal in a wireless communication system, the wireless communication system of the present invention transmits, to a terminal, a superframe header including information indicating whether or not to transmit the locating zone. Thus, the terminal can discern a terminal belonging to the location zone form among superframes received by the terminal.
1. A method for transmitting, by a base station, a location measurement signal for a location based service (LBS) in a wireless communication system, the method comprising:
configuring a location measurement zone for transmitting the location measurement signal;
transmitting a superframe header (SFH) including information indicating whether or not the location measurement zone is activated;
determining, based on a cell identity assigned to the base station, an orthogonal frequency division multiplexing access (OFDMA) symbol index from among a plurality of predefined OFDMA symbol indices within the location measurement zone and a carrier set from among a plurality of carrier sets; and
transmitting the location measurement signal on the determined carrier set and the determined OFDMA symbol index during the location measurement zone,
wherein the location measurement signal is transmitted by using a secondary advanced preamble of the base station, and
wherein each of the plurality of predetermined OFDMA symbol indices indicates a first OFDMA symbol of a first subframe of a last frame among first to last frames within a superframe belonging to the location measurement zone.
2. The method of claim 1 , wherein the SFH includes information indicating a transmission period of the location measurement zone.
3. A base station for transmitting a location measurement signal for a location based service (LBS) in a wireless communication system, the base station comprising:
a transmitter configured to transmit a radio signal to a user equipment; and
a processor configured to:
configure a location measurement zone for transmitting the location measurement signal,
control the transmitter to transmit a superframe header (SFH) including information indicating whether or not the location measurement zone is activated,
determine, based on a cell identity assigned to the base station, an orthogonal frequency division multiplexing access (OFDMA) symbol index from among a plurality of predefined OFDMA symbol indices within the location measurement zone and a carrier set from among a plurality of carrier sets, and
control the transmitter to transmit the location measurement signal on the determined carrier set and the determined OFDMA symbol index during the location measurement zone,
wherein the location measurement signal is transmitted by using a secondary advanced preamble of the base station, and
wherein each of the plurality of predetermined OFDMA symbol indices indicates a first OFDMA symbol of a first subframe of a last frame among first to last frames within a superframe belonging to the location measurement zone.
4. The base station of claim 3 , wherein the SFH includes information indicating a transmission period of the location measurement zone.
5. A method for receiving, by a user equipment, a location measurement signal for a location based service (LBS) in a wireless communication system, the method comprising:
receiving a superframe header (SFH) including information indicating whether or not a location measurement zone is activated; and
receiving, from a plurality of base stations, location measurement signals of the plurality of base stations on one or more carrier sets among a plurality carrier sets and one or more orthogonal frequency division multiplexing access (OFDMA) symbols among a plurality of predefined OFDMA symbols during the location measurement zone configured for reception of the location measurement signals,
wherein each of the location measurement signals is received on a carrier set among the plurality of carrier sets and an OFDMA symbol index among the plurality of predefined OFDMA symbol indices during the location measurement zone,
wherein the OFDMA symbol, in which a location measurement signal of a base station among the plurality of the base stations is received during the location measurement zone, and the carrier set, on which the location measurement signal of the base station is received during the location measurement zone, are determined based on a cell identity assigned to the base station,
wherein the location measurement signal is received by using a secondary advanced preamble of the base station, and
wherein each of the plurality of predefined OFDMA symbol indices indicates a first OFDMA symbol of a first subframe of a last frame among first to last frames within a superframe belonging to the location measurement zone.
6. The method of claim 5 , wherein the SFH includes information indicating a transmission period of the location measurement zone.
7. A user equipment for receiving a location measurement signal for a location based service (LBS) in a wireless communication system, the user equipment comprising:
a receiver configured to receive a radio signal; and
a processor configured to
control the receiver to receive a superframe header (SFH) including information indicating whether or not a location measurement zone is activated, and
control the receiver to receive, from a plurality of base stations, location measurement signals of the plurality of base stations on one or more carrier sets among a plurality carrier sets and one or more orthogonal frequency division multiplexing access (OFDMA) symbols among a plurality of predefined OFDMA symbols during the location measurement zone configured for reception of the location measurement signals,
wherein each of the location measurement signals is received on a carrier set among the plurality of carrier sets and an OFDMA symbol index among the plurality of predefined OFDMA symbol indices during the location measurement zone,
wherein the OFDMA symbol, in which a location measurement signal of a base station among the plurality of the base stations is received during the location measurement zone, and the carrier set, on which the location measurement signal of the base station is received during the location measurement zone, are determined based on a cell identity assigned to the base station,
wherein the location measurement signal is received by using a secondary advanced preamble of the base station, and
wherein each of the plurality of predetermined OFDMA symbol indices indicates a first OFDMA symbol of a first subframe of a last frame among first to last frames within a superframe belonging to the location measurement zone.
8. The user equipment of 7 , wherein the SFH includes information indicating a transmission period of the location measurement zone.