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 multiple configurations associated with a positioning reference signal (PRS), and wherein each respective configuration of the multiple configurations indicates a time period for measuring the PRS and a priority of the PRS;
receive an indication that the time period indicated by one of the multiple configurations is available for measuring the PRS, wherein the indication is received from the network device via a media access control (MAC) control element (CE);
determine, based at least on the indication received from the network device, whether the PRS has a higher priority than one or more other downlink transmissions associated with the time period available for measuring the PRS; and
based on a determination that the PRS has the higher priority than the one or more other downlink transmissions associated with the time period and a further determination that the time period is outside a measurement gap configured for the WTRU, receive the PRS instead of the one or more other downlink transmissions during the time period.
2. The WTRU of claim 1 , wherein the PRS and the one or more other downlink transmissions overlap in at least one symbol associated with the time period.
3. The WTRU of claim 1 , wherein the one or more other downlink transmissions include a downlink control channel transmission, a downlink shared channel transmission, or another reference signal transmission.
4. The WTRU of claim 1 , wherein the processor being configured to receive the PRS instead of the one or more other downlink transmissions during the time period comprises the processor being configured to measure the PRS during the time period and not to receive or measure the one or more other downlink transmissions during the time period.
5. The WTRU of claim 1 , wherein the multiple configurations are associated with a bandwidth part of the WTRU.
6. The WTRU of claim 1 , wherein each respective configuration of the multiple configurations indicates at least a length of the time period in terms of one or more slots.
7. The WTRU of claim 1 , wherein the processor is configured to determine whether the PRS has the higher priority than the one or more other downlink transmissions associated with the time period based on the priority of the PRS indicated by the one of the multiple configurations of which the time period for measuring the PRS is available.
8. The WTRU of claim 7 , wherein the processor is configured to determine whether the PRS has the higher priority than the one or more other downlink transmissions associated with the time period comprises the processor being configured to determine, based on the priority of the PRS indicated by the one of the multiple configurations, that the PRS has a higher priority than all downlink transmissions associated with the time period.
9. The WTRU of claim 1 , wherein, based on a determination that the PRS has a lower priority than the one or more other downlink transmissions associated with the time period, the processor is configured to receive the one or more other downlink transmissions during the time period.
10. The WTRU of claim 1 , wherein the MAC CE received from the network device further includes a bitmap that indicates a muting pattern of the PRS, and wherein the processor is further configured to receive the PRS based on the indicated muting pattern.
11. 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 multiple configurations associated with a positioning reference signal (PRS), and wherein each respective configuration of the multiple configurations indicates a time period for measuring the PRS and a priority of the PRS;
receiving an indication that the time period indicated by one of the multiple configurations is available for measuring the PRS, wherein the indication is received from the network device via a media access control (MAC) control element (CE);
determining, based at least on the indication received from the network device, whether the PRS has a higher priority than one or more other downlink transmissions associated with the time period for measuring the PRS; and
based on a determination that the PRS has the higher priority than the one or more other downlink transmissions associated with the time period and a further determination that the time period is outside a measurement gap configured for the WTRU, receiving the PRS instead of the one or more other downlink transmissions during the time period.
12. The method of claim 11 , wherein the PRS and the one or more other downlink transmissions overlap in at least one symbol associated with the time period.
13. The method of claim 11 , wherein the one or more other downlink transmissions include a downlink control channel transmission, a downlink shared channel transmission, or another reference signal transmission.
14. The method of claim 11 , receiving the PRS during the time period comprises measuring the PRS during the time period.
15. The method of claim 11 , wherein the multiple configurations are associated with a bandwidth part of the WTRU, and wherein each respective configuration of the multiple configurations indicates at least a length of the time period in terms of one or more slots.
16. The method of claim 11 , wherein the PRS is determined to have the higher priority than the one or more other downlink transmissions associated with the time period based on the priority of the PRS indicated by the one of the multiple configurations of which the time period for measuring the PRS is available.
17. The method of claim 11 , wherein, based on a determination that the PRS has a lower priority than the one or more other downlink transmissions associated with the time period, the method further comprises receiving the one or more other downlink transmissions during the time period.
18. The method of claim 11 , wherein the MAC CE received from the network device further includes a bitmap that indicates a muting pattern of the PRS, and wherein the PRS is received based on the indicated muting pattern.