Method and apparatus for supporting positioning measurements
A method and apparatus for supporting positioning measurements. The methods include designating a reference cell, choosing a positioning signal, and, for inter-frequency measurements, determining which inter-frequency cell to measure and how to make such an inter-frequency positioning measurement.
1. A method for supporting positioning measurements, comprising:
designating a first cell as a reference cell;
designating a second cell as a non-reference cell; and
providing, via a network entity to a wireless transmit/receive unit (WTRU), reference cell information and non-reference cell information, wherein the non-reference cell information includes: (1) a subframe offset between a first Positioning Reference Signal (PRS) transmitted by the reference cell and a second PRS transmitted by the non-reference cell and (2) time difference information indicative of a relative timing difference between the reference and non-reference cells based on the first and second PRSs.
2. The method of claim 1 , wherein the reference cell is a non-serving cell.
3. The method of claim 1 , wherein the non-reference cell information identifies a carrier frequency of the non-reference cell.
4. The method of claim 1 , wherein the reference cell information includes an identity of the reference cell.
5. The method of claim 1 , wherein the reference cell information includes PRS information for the reference cell on a condition that the reference cell supports PRS transmission.
6. The method of claim 5 , wherein the PRS information includes PRS subframe allocation information.
7. A location server, comprising:
a processor configured to:
designate a first cell as a reference cell;
designate a second cell as a non-reference cell; and
provide reference cell information and non-reference cell information to a wireless transmit/receive unit (WTRU) for performing positioning measurements with respect to the reference cell and the non-reference cell, wherein the non-reference cell information includes: (1) a subframe offset between a first Positioning Reference Signal (PRS) transmitted by the reference cell and a second PRS transmitted by the non-reference cell and (2) time difference information indicative of a relative timing difference between the reference and non-reference cells based on the first and second PRSs.
8. The location server of claim 7 , wherein the reference cell is a non-serving cell.
9. The location server of claim 7 , wherein the non-reference cell information identifies a carrier frequency of the non-reference cell.
10. The location server of claim 7 , wherein the reference cell information includes an identity of the reference cell.
11. The location server of claim 7 , wherein the reference cell information includes PRS information for the reference cell on a condition that the reference cell supports PRS transmission.
12. The location server of claim 11 , wherein the PRS information includes PRS subframe allocation information.
13. A method for supporting positioning measurements, comprising:
transmitting an identity of a reference cell to a wireless transmit/receive unit (WTRU);
transmitting, via a network entity to the WTRU, assistance data, wherein the assistance data includes: (1) a subframe offset between a first Positioning Reference Signal (PRS) transmitted by the reference cell and a second PRS transmitted by the non-reference cell, and (2) time difference information indicative of a relative timing difference between the reference and non-reference cells based on the first and second PRSs; and
receiving a measurement made using the assistance data from the WTRU.
14. The method of claim 13 , wherein the reference cell is a non-serving cell.
15. The method of claim 13 , wherein the assistance data identifies a carrier frequency of the non-reference cell.
16. The method of claim 13 , wherein the assistance data includes an identity of the non-reference cell.
17. A location server, comprising:
a processor configured to:
transmit an identity of a reference cell to a wireless transmit/receive unit (WTRU);
transmit assistance data to the WTRU, wherein the assistance data includes: (1) a subframe offset between a first Positioning Reference Signal (PRS) transmitted by the reference cell and a second PRS transmitted by the non-reference cell, and (2) time difference information indicative of a relative timing difference between the reference and non-reference cells based on the first and second PRSs; and
receive a measurement made using the assistance data from the WTRU.
18. The location server of claim 17 , wherein the reference cell is a non-serving cell.
19. The location server of claim 17 , wherein the assistance data identifies a carrier frequency of the non-reference cell.
20. The location server of claim 17 , wherein the assistance data includes an identity of the non-reference cell.