Method in which a terminal connected to a cellular network measures a wireless LAN and receives information for measurement in a wireless access system, and terminal or base station device for same

1. A method for performing measurement and reporting for access to a second base station by a user equipment based on a first base station in a wireless access system, the method comprising:

receiving information on the second base station from the first base station;

measuring the second base station using the information on the second base station; and

reporting measurement information for the second base station to the first base station,

wherein the measuring is performed based on a reference signal transmitted by the second base station, and

wherein the reference signal transmitted by the second base station corresponds to a reference signal of the first base station, and the first base station and the second base station are heterogeneous networks.

2. The method according to claim 1 , wherein the first base station is a cellular network base station and the second base station is an access point (AP).

3. The method according to claim 1 , wherein the information on the second base station includes at least one of channel information, a list of at least one access point (AP), a cell identity, a number of antenna ports, a transmission pattern of the reference signal transmitted by the second base station, transmission bandwidth of the reference signal transmitted by the second base station, transmission timing information of a beacon signal, and transmission period and offset information.

4. The method according to claim 3 , wherein the transmission period and offset information of the reference signal transmitted by the second base station is exchanged between the first base station and the second base station through a backhaul link.

5. The method according to claim 1 , further comprising:

receiving a cell-specific reference signal (CRS) pattern from the second base station, wherein an orthogonal frequency division multiplexing (OFDM) symbol on which a CRS is not transmitted is omitted in the CRS pattern.

6. The method according to claim 1 , further comprising:

receiving measurement window information of a transmission timing of the reference signal from the first base station to adjust time synchronization between the first base station and the second base station; and

performing measurement for the second base station according to the adjusted synchronization.

7. The method according to claim 1 , further comprising:

transmitting, to the first base station, at least one of statistics of a channel state of the second base station, the number of contention stations, estimated throughput information, and channel recommendation information.

8. A method for receiving measurement information for a second base station by a first base station in a wireless access system, the method comprising:

transmitting activated information on the second base station to a user equipment based on the first base station in consideration of a location of the user equipment based on the first base station; and

receiving measurement information for the second base station measured by the user equipment based on the first base station, using the information on the second base station,

wherein the measurement information for the second base station is obtained based on a reference signal transmitted by the second base station, and

wherein the reference signal transmitted by the second base station corresponds to a reference signal of the first base station, and the first base station and the second base station are heterogeneous networks.

9. The method according to claim 8 , wherein the first base station is a cellular network base station and the second base station is an access point (AP).

10. The method according to claim 8 , wherein the information on the second base station includes at least one of channel information, a list of at least one access point (AP), a cell identity, the number of antenna ports, a transmission pattern of the reference signal transmitted by the second base station, transmission bandwidth of the reference signal transmitted by the second base station, transmission timing information of a beacon signal, and transmission period and offset information.

11. The method according to claim 10 , wherein the transmission period and offset information of the reference signal transmitted by the second base station is exchanged with the second base station through a backhaul link.

12. The method according to claim 8 , further comprising:

receiving a cell-specific reference signal (CRS) pattern from the user equipment based on the first base station, wherein an orthogonal frequency division multiplexing (OFDM) symbol on which a CRS is not transmitted is omitted in the CRS pattern.

13. The method according to claim 8 , further comprising:

transmitting measurement window information of a transmission timing of the reference signal to the user equipment based on the first base station to adjust time synchronization between the first base station and the second base station; and

performing measurement for the second base station according to the adjusted synchronization.

14. The method according to claim 8 , further comprising:

receiving, from the user equipment based on the first base station, at least one of statistics of a channel state of the second base station, the number of contention stations, estimated throughput information, and channel recommendation information.

15. A user equipment based on a first base station, for performing measurement for access to a second base station in a wireless access system, the user equipment comprising:

a transmitter;

a receiver; and

a processor configured to:

control the transmitter and the receiver,

control the receiver to receive information on the second base station from the first base station,

measure the second base station using the information on the second base station, and

control the transmitter to report measurement information for the second base station to the first base station, and

wherein the measurement for the second base station is performed based on a reference signal transmitted by the second base station, and

wherein the reference signal transmitted by the second base station corresponds to a reference signal of the first base station, and the first base station and the second base station are heterogeneous networks.

16. A first base station for receiving measurement information for a second base station in a wireless access system, the first base station comprising:

a transmitter;

a receiver; and

a processor configured to:

control the transmitter and the receiver,

control the transmitter to transmit activated information on the second base station to a user equipment based on the first base station in consideration of a location of the user equipment based on the first base station, and

control the receiver to receive measurement information for the second base station measured by the user equipment based on the first base station, using the information on the second base station,

wherein the measurement information for the second base station is obtained based on a reference signal transmitted by the second base station, and

wherein the reference signal transmitted by the second base station corresponds to a reference signal of the first base station, and the first base station and the second base station are heterogeneous networks.