Handling positioning reference signals in wireless systems
Systems, methods, and instrumentalities are described for handling positioning reference signals in a wireless communication system. The positioning reference signals may be assigned priorities that may be used to facilitate various operations of a wireless transmit/receive unit (WTRU) such as positioning related services, collision avoidance, measurement and reporting, etc. The WTRU may be configured with multiple muting patterns associated with the positioning reference signals and may switch between different muting patterns based on the priorities of the positioning reference signals and/or other downlink (DL) or uplink (UL) transmissions that may overlap or collide with the positioning reference signals.
1 . A wireless transmit/receive unit (WTRU) comprising:
a processor configured to:
receive radio resource control (RRC) configuration information from a network device, wherein the RRC configuration information indicates a time period for measuring a positioning reference signal (PRS) transmission and a priority of the PRS transmission compared to one or more other downlink transmissions;
determine, based on an indication from the network device, that the time period is available for measuring the PRS transmission;
responsive to determining that the time period is available for measuring the PRS transmission and based on a further determination to measure the PRS transmission outside a measurement gap configured for the WTRU, determine, based on the priority of the PRS transmission indicated by the RRC configuration information, whether the PRS transmission has a higher priority than the one or more other downlink transmissions; and
based on a determination that the PRS transmission has the higher priority than the one or more other downlink transmissions, receive the PRS transmission.
2 . The WTRU of claim 1 , wherein the processor being configured to receive the PRS transmission comprises the processor being configured to measure the PRS transmission during the time period.
3 . The WTRU of claim 2 , wherein the processor is further configured to determine a position of the WTRU based on the measurement of the PRS transmission.
4 . The WTRU of claim 1 , wherein, based on the determination that the PRS transmission has the higher priority than the one or more other downlink transmissions, the processor is further configured to not receive the one or more other downlink transmissions during the time period indicated by the RRC configuration information.
5 . The WTRU of claim 1 , wherein the one or more other downlink transmissions include a downlink shared channel transmission.
6 . The WTRU of claim 1 , wherein, based on a determination that the PRS transmission does not have the higher priority than the one or more other downlink transmissions, the processor is further configured to receive the one or more other downlink transmissions instead of the PRS transmission during the time period.
7 . The WTRU of claim 1 , wherein the time period indicated by the RRC configuration information is outside a measurement gap.
8 . The WTRU of claim 1 , wherein the indication from the network device indicates that the WTRU is to receive the PRS transmission or the one or more other downlink transmissions during the time period indicated by the RRC configuration information.
9 . The WTRU of claim 1 , wherein the PRS transmission and the one or more other downlink transmissions overlap in at least one symbol.
10 . The WTRU of claim 1 , wherein the indication is received from the network device via a medium access control (MAC) control element (CE).
11 . The WTRU of claim 1 , wherein a length of the time period is indicated by the RRC configuration information in terms of one or more slots.
12 . A method implemented by a wireless transmit/receive unit (WTRU), the method comprising:
receiving radio resource control (RRC) configuration information from a network device, wherein the RRC configuration information indicates a time period for measuring a positioning reference signal (PRS) transmission and a priority of the PRS transmission compared to one or more other downlink transmissions;
determining, based on an indication from the network device that the time period is available for measuring the PRS transmission;
responsive to determining that the time period is available for measuring the PRS transmission and based on a further determination to measure the PRS transmission outside a measurement gap configured for the WTRU, determine, based on the priority of the PRS transmission indicated by the RRC configuration information, whether the PRS transmission has a higher priority than the one or more other downlink transmissions; and
based on a determination to receive the PRS transmission has the higher priority than the one or more other transmissions, receiving the PRS transmission during the time period.
13 . The method of claim 12 , wherein receiving the PRS transmission comprises measuring the PRS transmission during the time period.
14 . The method of claim 13 , further comprising determining a position of the WTRU based on the measurement of the PRS transmission.
15 . The method of claim 12 , wherein the one or more other downlink transmissions include a downlink shared channel transmission.
16 . The method of claim 12 , further comprising, based on a determination that the PRS transmission does not have the higher priority than the one or more other downlink transmissions, receiving the one or more other downlink transmissions instead of the PRS transmission during the time period.
17 . The method of claim 12 , wherein the time period indicated by the RRC configuration information is outside a measurement gap.
18 . The method of claim 12 , wherein the indication from the network device indicates that the WTRU is to receive the PRS transmission or the one or more other downlink transmissions during the time period indicated by the RRC configuration information.
19 . The method of claim 12 , wherein the indication from the network device is received via a medium access control (MAC) control element (CE).
20 . The method of claim 12 , wherein a length of the time period is indicated by the RRC configuration information in terms of one or more slots.
21 . A wireless transmit/receive unit (WTRU) comprising:
a processor configured to:
receive an indication of a positioning reference signal (PRS) resource set;
determine a positioning method for determining a position of the WTRU;
determine that one or more PRS resources of the PRS resource set are prioritized for the positioning method;
perform a measurement associated with the positioning method using the one or more PRS resources; and
send a report that indicates the measurement associated with the positioning method.
22 . The WTRU of claim 21 , wherein the positioning method comprises downlink angle of departure (DL-AoD), and wherein the measurement associated with the positioning method comprises a reference signal received power (RSRP) measurement of the subset of the PRS resource set.