Methods and apparatus for enabling frequency layers for positioning
A method for a Wireless Transmit/Receive Unit (WTRU). The method including receiving from a network configuration information indicating multiple frequency layers for positioning reference signals; and at least one activated frequency layer from among the multiple frequency layers. The frequency layers may be associated with one or more carriers for data transmission, wherein the carrier is co-located with its associated frequency layer for positioning; and bandwidth parts (BWPs) within carriers for data transmission. The WTRU may receive from the network activation/deactivation information indicating activation/deactivation of any of a secondary cell (SCell) and a BWP. The WTRU may transmit information indicating, for example, a set of frequency layers used for positioning, wherein the set of frequency layers is enabled according to any of an accuracy requirement, a latency, a measured RSRP of one frequency layer, and a measured CSI-RS corresponding to BWPs being a threshold.
1. A wireless transmit/receive unit (WTRU) comprising a processor configured to:
receive configuration information from a network, the configuration information indicating a plurality of frequency layers (FLs), wherein each FL is associated with a respective set of one or more positioning reference signal (PRS) resources, wherein the configuration information indicates a respective bandwidth and respective frequency location information for each FL of the plurality of FLs;
receive at least a first PRS associated with a first set of one or more PRS resources corresponding to a first FL of the plurality of FLs and a second PRS associated with a second set of one or more PRS resources corresponding to a second FL of the plurality of FLs;
determine that a repetition factor and a comb factor are common for the first set of one or more PRS resources corresponding to the first FL and the second set of one or more PRS resources corresponding to the second FL;
determine a plurality of measurement reporting values based on at least the first PRS associated with the first set of one or more PRS resources corresponding to the first FL of the plurality of FLs and the second PRS associated with the second set of one or more PRS resources corresponding to the second FL of the plurality of FLs, wherein the plurality of measurement reporting values corresponds to at least a first measurement reporting value indicating an aggregate reference signal received power measurement value associated with at least the first and second FLs and a second measurement reporting value indicating an aggregate reference signal time delay measurement value associated with at least the first and second FLs; and
send a measurement report comprising the first and second measurement reporting values and indications of at least the first and second FLs.
2. The WTRU as in claim 1 , wherein the processor is processor configured to determine that the first measurement reporting value is below a configured threshold, and send in the measurement report a request to receive additional PRS associated with an additional set of one or more PRS resources corresponding to an additional FL of the plurality of FLs.
3. The WTRU as in claim 2 , wherein the processor is processor configured to receive a second configuration information from a network, the second configuration information indicating a plurality of FLs for positioning measurements for a third PRS associated with a third set of one or more PRS resources corresponding to a third FL of the plurality of FLs.
4. The WTRU as in claim 1 , wherein the processor is processor configured to activate at least the first and second FLs in accordance with the measurement report.
5. The WTRU as is claim 1 , wherein the measurement report further comprises an indication of a number of FLs associated with the first and second measurement reporting values.
6. The WTRU as in claim 1 , wherein processor configured to determine at least one symbol is common for the first set of one or more PRS resources corresponding to the first FL and the second set of one or more PRS resources corresponding to the second FL.
7. The WTRU as in claim 6 , wherein the at least one symbol is an orthogonal frequency-division multiplexing (OFDM) symbol.
8. A method performed by a wireless transmit/receive unit (WTRU) comprising the steps of:
receiving configuration information from a network, the configuration information indicating a plurality of frequency layers (FLs), wherein each FL is associated with a respective set of one or more positioning reference signal (PRS) resources, wherein the configuration information indicates a respective bandwidth and respective frequency location information for each FL of the plurality of FLs;
receiving at least a first PRS associated with a first set of one or more PRS resources corresponding to a first FL of the plurality of FLs and a second PRS associated with a second set of one or more PRS resources corresponding to a second FL of the plurality of FLs;
determining that a repetition factor and a comb factor are common for the first set of one or more PRS resources corresponding to the first FL and the second set of one or more PRS resources corresponding to the second FL;
determining a plurality of measurement reporting values based on at least the first PRS associated with the first set of one or more PRS resources corresponding to the first FL of the plurality of FLs and the second PRS associated with the second set of one or more PRS resources corresponding to the second FL of the plurality of FLs, wherein the plurality of measurement reporting values corresponds to at least a first measurement reporting value indicating an aggregate reference signal received power measurement value associated with at least the first and second FLs and a second measurement reporting value indicating an aggregate reference signal time delay measurement value associated with at least the first and second FLs; and
sending a measurement report comprising the first and second measurement reporting values and indications of at least the first and second FLs.
9. The method as in claim 8 , further comprising determining that the first measurement reporting value is below a configured threshold, and sending in the measurement report a request to receive additional PRS associated with an additional set of one or more PRS resources corresponding to an additional FL of the plurality of FLs.
10. The method as in claim 9 , further comprising receiving a second configuration information from a network, the second configuration information indicating a plurality of FLs for positioning measurements for a third PRS associated with a third set of one or more PRS resources corresponding to a third FL of the plurality of FLs.
11. The WTRU as in claim 8 , further comprising activating the first and second FLs in accordance with the measurement report.
12. The method as is claim 8 , wherein the measurement report further comprises an indication of a number of FLs associated with the first and second measurement reporting values.
13. The method as in claim 8 , further comprising determining that at least one symbol is common for the first set of one or more PRS resources corresponding to the first FL and the second set of one or more PRS resources corresponding to the second FL.
14. The method as in claim 13 , wherein the at least one symbol is an orthogonal frequency-division multiplexing (OFDM) symbol.