Communication device and method for controlling the same

1. A communication device comprising:

a transceiver;

a memory electrically connected with the transceiver; and

a processor electrically connected with the transceiver and the memory,

wherein the processor is configured to:

receive a first subframe from a serving cell and a plurality of subframes from a plurality of neighbor cells;

measure a respective time difference of arrival (TDOA) for each of the plurality of subframes based on a time of arrival (TOA) of the first subframe; and

transmit at least one of the measured TDOAs to a location server,

wherein the respective TDOAs are measured based on at least one of a cell-specific reference signal (CRS) and a synchronization signal in the plurality of subframes, and

wherein the at least one of the measured TDOAs is determined according to a strength of received power measured based on the CRS.

2. The communication device of claim 1 , wherein the plurality of subframes further comprise a positioning reference signal (PRS).

3. The communication device of claim 2 , wherein the processor is further configured to combine the PRS and the at least one of the CRS and the synchronization signal and to measure the respective TDOAs based on a signal obtained by combining the PRS and the at least one of the CRS and the synchronization signal.

4. The communication device of claim 2 , wherein the processor is further configured to measure the respective TDOAs for the PRS and the at least one of the CRS and the synchronization signal.

5. The communication device of claim 1 , wherein the processor is further configured to control the transceiver to receive assistance data from the location server.

6. The communication device of claim 1 , wherein the processor is further configured to control the transceiver to receive, from a base station, information about cell priorities determined based on a location of the communication device that is estimated based on the TDOAs.

7. A method for controlling a communication device, the method comprising:

receiving a first subframe from a serving cell and a plurality of subframes from a plurality of neighbor cells;

measuring a respective time difference of arrival (TDOA) for each of the plurality of subframes based on a time of arrival (TOA) of the first subframe; and

transmitting at least one of the measured TDOAs to a location server,

wherein the respective TDOAs are measured based on at least one of a cell-specific reference signal (CRS) and a synchronization signal in the plurality of subframes, and

wherein the at least one of the measured TDOAs is determined according to a strength of received power measured based on the CRS.

8. The method of claim 7 , wherein the plurality of subframes further comprise a positioning reference signal(PRS).

9. The method of claim 8 , wherein measuring the respective TDOAs comprises combining the PRS and the at least one of the CRS and the synchronization signal and measuring the TDOAs of the respective subframes based on a signal obtained by combining the PRS and the at least one of the CRS and the synchronization signal.

10. The method of claim 8 , wherein measuring the respective TDOAs comprises measuring the respective TDOAs for the PRS and the at least one of the CRS and the synchronization signal.

11. The method of claim 7 , further comprising receiving assistance data from the location server.

12. The method of claim 7 , further comprising receiving, from a base station, information about cell priorities determined based on a location of the communication device that is estimated based on the TDOAs.

13. A chipset configured to:

receive a first subframe from a serving cell and a plurality of subframes from a plurality of neighbor cells;

measure a respective time difference of arrival (TDOA) for each of the plurality of subframes based on a time of arrival (TOA) of the first subframe; and

transmit at least one of the measured TDOAs to a location server,

wherein the respective TDOAs are measured based on at least one of a cell-specific reference signal (CRS) and a synchronization signal in the plurality of subframes, and

wherein the at least one of the measured TDOAs is determined according to a strength of received power measured based on the CRS.

14. The chipset of claim 13 , wherein the plurality of subframes further comprise a positioning reference signal (PRS).

15. The chipset of claim 14 , wherein the chipset is further configured to combine the PRS and the at least one of the CRS and the synchronization signal, and to measure the respective TDOAs based on a signal obtained by combining the PRS and the at least one of the CRS and the synchronization signal.

16. The chipset of claim 14 , wherein the chipset is further configured to measure the respective TDOAs for the PRS and the at least one of the CRS and the synchronization signal.

17. The chipset of claim 13 , wherein the chipset is further configured to receive assistance data from the location server.

18. A chipset for communication, configured to;

receive a first subframe from a serving cell and a plurality of subframes from a plurality of neighbor cells;

measure a respective time difference of arrival (TDOA) for each of the plurality of subframes based on a time of arrival (TOA) of the first subframe; and

transmit at least one of the measured TDOAs to a location server,

wherein the respective TDOAs are measured based on at least one of a cell-specific reference signal (CRS) and a synchronization signal, and

wherein the at least one of the measured TDOAs is determined according to a strength of received power measured based on the CRS.

19. A method for controlling a communication device, the method comprising:

receiving, at a transceiver of the communication device, a first subframe from a serving cell;

receiving, at the transceiver,a second subframe from a neighbor cell;

receiving, at the transceiver, a third subframe from a second neighbor cell;

measuring, at the processor, of the commnunication device, a first time difference of arrival (TDOA) between a first time of arrival (TOA) of the first subframe and a second TOA of the second subframe;

measuring, at the processor, a second TDOA between the first TOA and a third TOA of the third subframe; and

transmitting, by the transceiver, at least one of the first TDOA and the second TDOA to a location server,

wherein the first TDOA and the second TDOA are measured based on at least one of a cell-specific signal (CRS) and a synchronization signal in one or more of the first, second, and third subframes, and

wherein the at least one of the measured TDOAs is determined according to a strength of the received power measured based on the CRS.