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 base station cell as a reference cell;
designating a second base station cell as a non-reference cell;
determining whether to present an indication of support of positioning reference signal (PRS) transmission in reference cell information; and
transmitting 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 reference cell information includes PRS information for the reference cell on a condition that the indication is present and does not include PRS information for the reference cell on a condition that the indication is absent.
2. The method of claim 1 , wherein the reference cell is a non-serving cell.
3. The method of claim 1 , wherein the PRS information includes PRS subframe allocation information.
4. The method of claim 1 , wherein the non-reference cell information includes an indication of a time offset between a start of a first PRS subframe transmitted by the reference cell and a start of a first PRS subframe transmitted by the non-reference cell.
5. A location server, comprising:
a processor configured to:
designate a first base station cell as a reference cell;
designate a second base station cell as a non-reference cell; and
determine whether to present an indication of support of positioning reference signal (PRS) transmission in reference cell information; and
a transmit/receive unit configured to:
transmit 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 reference cell information includes PRS information for the reference cell on a condition that the indication is present and does not include PRS information for the reference cell on a condition that the indication is absent.
6. The location server of claim 5 , wherein the reference cell is a non-serving cell.
7. The location server of claim 5 , wherein the PRS information includes PRS subframe allocation information.
8. The location server of claim 5 , wherein the non-reference cell information includes an indication of a time offset between a start of a first PRS subframe transmitted by the reference cell and a start of a first PRS subframe transmitted by the non-reference cell.
9. A location server, comprising:
a processor configured to:
designate a first base station cell as a reference cell; and
designate a second base station cell as a non-reference cell; and
a transmit/receive unit configured to transmit 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 an indication of a time offset between a start of a first positioning reference signal (PRS) subframe transmitted by the reference cell and a start of a first PRS subframe transmitted by the non-reference cell.
10. The location server of claim 9 , wherein the reference cell is a non-serving cell.
11. The location server of claim 9 , wherein the processor is configured to determine whether to present an indication of support of PRS transmission in reference cell information.
12. The location server of claim 11 , wherein the reference cell information includes PRS information for the reference cell on a condition that the indication is present and does not include PRS information for the reference cell on a condition that the indication is absent.
13. The location server of claim 12 , wherein the PRS information includes PRS subframe allocation information.