Techniques for measuring a location of UE

• US 9,374,728 B2
• Filed: 06/05/2015
• Issued: 06/21/2016
• Est. Priority Date: 12/14/2010
• Status: Active Grant

• Current Assignee: LG Electronics, Inc. (LG Corporation)
• Original Assignee: LG Electronics, Inc. (LG Corporation)
• Inventors: Lim, Suhwan, Lee, Sangwook, Jung, Manyoung, Lee, Daewon, Yang, Yoonoh
• Primary Examiner(s): TRAN, CONGVAN
• Application Number:
  US14/732,539
• Publication Number:
  US 20150365836A1
• Time in Patent Office: 382 Days
• Field of Search: 455/456.1, 455/456.3, 455/67.11, 455/115.1, 455/456, 370/328, 370/338
• US Class Current: 1/1
• CPC Class Codes: G01S 5/10 Position of receiver fixed by co-ordinating a plurality of position lines defined by path-difference measurements , e.g. omega or decca systemsG01S5/12 takes precedence ; beacons and receivers cooperating therewith G01S1/306, G01S1/308
• CPC Class Codes: H04W 24/00 Supervisory, monitoring or testing arrangements
• CPC Class Codes: H04W 24/08 Testing, supervising or monitoring using real traffic
• CPC Class Codes: H04W 24/10 Scheduling measurement reports ; Arrangements for measurement reports
• CPC Class Codes: H04W 4/02 Services making use of location information
• CPC Class Codes: H04W 48/16 Discovering, processing access restriction or access information
• CPC Class Codes: H04W 64/00 Locating users or terminals or network equipment for network management purposes, e.g. mobility management
• CPC Class Codes: H04W 72/0446 Resources in time domain, e.g. slots or frames

Abstract

The present invention provides a method for measuring a location. The method comprises: receiving, by a User Equipment (UE) and from a serving cell, information on a bandwidth allocated for a positioning reference signal (PRS); receiving, by the User Equipment (UE) and from at least one or more neighbor cells, information on a bandwidth allocated for a PRS; determining whether there is a difference between the bandwidths; and measuring, by the UE and based on a result of the determination a timing difference between PRSs transmitted from the serving cell and the at least one or more neighbor cells.

Claims

1. A method for measuring an observed time difference of arrival (OTDOA), the method performed by a terminal and comprising:

acquiring information on a first bandwidth allocated for PRSs (Positioning Reference Signals) of a serving cell;

acquiring information on a second bandwidth allocated for PRSs of a neighbour cell;

acquiring information on a third bandwidth allocated for PRSs of a reference cell; and

measuring a RSTD (Reference Signal Time Difference) which is a relative timing difference between the neighbour cell and the reference cell, with a RSTD measurement accuracy,

wherein the RSTD measurement accuracy is determined based on a number of available measurement subframes and a minimum bandwidth among the first bandwidth of the serving cell, the second bandwidth of the neighbour cell and the third bandwidth of the reference cell.

2. The method of claim 1, further comprising:

receiving, from a server, a request location information message for requesting information indicating a type of location information; and

transmitting, a provide location information message in response to the request location information message to the server.

3. The method of claim 2, wherein the provide location information message includes a positioning measurements.

4. The method of claim 1, further comprising:

receiving an OTDOA assistance data message including a cell identity of the neighbour cell.

5. The method of claim 4, wherein the OTDOA assistance data further includes information on the second bandwidth and the third bandwidth.

6. The method of claim 4, wherein the OTDOA assistance data includes at least one of:

information on an antenna port configuration indicating a number of antenna ports for cell specific reference signals;

information on slot number offset between the neighbour cell and the reference cell;

information on sub-frame offset of PRS between a first PRS subframe of the reference cell and a first PRS subframe of the neighbour cell.

7. The method of claim 4, wherein the OTDOA assistance data includes at least one of:

a first field related to a RSTD value that the terminal is expected to measure between cells, and

a second field related to an uncertainty in the RSTD value.

8. A user equipment for measuring an observed time difference of arrival (OTDOA), the user equipment comprising:

a transceiver to transceive signals; and

a controller which is configured to;

acquire information on a first bandwidth allocated for PRSs (Positioning Reference Signals) of a serving cell,

acquire information on a second bandwidth allocated for PRSs of a neighbour cell,

acquire information on a third bandwidth allocated for PRSs of a reference cell, and

measuring a RSTD (Reference Signal Time Difference), which is a relative timing difference between the neighbour cell and the reference cell, with a RSTD measurement accuracy,

wherein the RSTD measurement accuracy is determined based on a number of available measurement subframes and a minimum bandwidth among the first bandwidth of the serving cell, the second bandwidth of the neighbour cell and the third bandwidth of the reference cell.

9. The user equipment of claim 8, wherein the controller is further configured to:

receiving, from a server, a request location information message for requesting information indicating a type of location information; and

transmitting, a provide location information message in response to the request location information message to the server.

10. The user equipment of claim 9, wherein the provide location information message includes a positioning measurements.

11. The user equipment of claim 8, wherein the controller is further configured to:

receiving an OTDOA assistance data message including a cell identity of the neighbour cell.

12. The user equipment of claim 11, wherein the OTDOA assistance data further includes information on the second bandwidth and the third bandwidth.

13. The user equipment of claim 11, wherein the OTDOA assistance data includes at least one of:

information on an antenna port configuration indicating a number of antenna ports for cell specific reference signals;

information on slot number offset between the neighbour cell and the reference cell;

information on sub-frame offset of PRS between a first PRS subframe of the reference cell and a first PRS subframe of the neighbour cell.

14. The user equipment of claim 11, wherein the OTDOA assistance data includes at least one of:

a first field related to a RSTD value that the terminal is expected to measure between cells, and

a second field related to an uncertainty in the RSTD value.