Techniques for measuring a location of UE

• US 9,084,127 B2
• Filed: 12/08/2011
• Issued: 07/14/2015
• 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:
  US13/992,918
• Publication Number:
  US 20130260793A1
• Time in Patent Office: 1,314 Days
• Field of Search: 455/456.1, 455/456.3, 455/67.11, 455/115.1, 455/456.5, 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 (Position Reference Signals) of a serving cell;

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

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

measuring a RSTD (Reference Signal Time Difference) using a RSTD measurement accuracy determined based on a minimum bandwidth between the first bandwidth of the serving cell, the second bandwidth of the neighbor cell, and the third bandwidth of the reference cell,

wherein the RSTD is a relative timing difference between the neighbor cell and 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;

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

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 cell identities of the neighbor cell.

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

6. The method of claim 4, wherein the OTDOA assistance data message 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 neighbor cell and the reference cell;

or

information on a subframe offset between a first PRS subframe of the reference cell and a first PRS subframe of the one of the neighbor cell.

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

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

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

8. A user equipment for measuring an observed time difference of arrival (OTDOA) based on a reference signal from a reference cell, the user equipment comprising:

a transceiver unit configured to transceive signals; and

a controller operatively connected to the transceiver and 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 neighbor cell;

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

measure a RSTD (Reference Signal Time Difference) using a RSTD measurement accuracy determined based on a minimum bandwidth between the first bandwidth of the serving cell, the second bandwidth of the neighbor cell, and the third bandwidth of the reference cell,

wherein the RSTD is a relative timing difference between the neighbor cell and the reference cell.

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

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

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

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

11. The user equipment of claim 8, the controller is further configured to receive and OTDOA assistance data message including cell identities of the neighbor cell.

12. 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 one of the neighbor cell and the reference cell;

or

information on a subframe offset between a first PRS subframe of the reference cell and a first PRS subframe of the one of the neighbor cell.

13. The method 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, or

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