System and method for phase tracking reference signal dynamic presence in ultra-reliable and low-latency and port indication
A user equipment wireless communication device in a wireless communication environment receives a signal from the network that includes a radio network temporary ID. From the radio network temporary ID, the user equipment is capable of determining whether a phase tracking reference signal is present based on the radio network temporary ID. If any of these are identified by the radio network temporary ID, then the user equipment determines that a phase tracking reference signal is present. After the user equipment has determined that the phase tracking reference signal is present, the user equipment can then determine which phase tracking reference signal antenna ports are to be used based on the values of the transmitted precoding matrix indicator value and the transmit rank indicator.
1. A device for use in a wireless communication environment, comprising:
a memory storing instructions; and
one or more processors coupled to the memory and, when executing the instructions, configured to:
receive a signal that includes a radio network temporary identification (RNTI);
determine that a phase tracking reference signal is present based on the RNTI;
determine a number of phase tracking reference signal antenna ports to be used based on whether to use codebook or non-codebook based transmission; and
perform wireless communications based on the phase tracking reference signal and using a modulation and coding scheme table, wherein the modulation and coding scheme table is selected based on the RNTI.
2. The device of claim 1 , wherein the phase tracking reference signal is determined as present in response to determining that the RNTI is one of C-RNTI, CS-RNTI, SP-CSI-RNTI, or MCS-C-RNTI.
3. The device of claim 1 , wherein in response to determining to use non-codebook based transmission, the one or more processors are further configured to set the number of phase tracking reference signal antenna ports based on a sounding reference signal (SRS) resource.
4. The device of claim 1 ,
wherein in response to determining to use codebook based transmission, the one or more processors are further configured to set the number of phase tracking reference signal antenna ports to be either one port or two ports depending on values of a transmitted precoding matrix indicator and a transmit rank indicator.
5. The device of claim 4 , wherein the one or more processors are further configured to set the number of phase tracking reference signal antenna ports to be two in response to the value of the transmitted precoding matrix indicator value being zero and the value of the transmit rank indicator being one.
6. The device of claim 5 , wherein the one or more processors are further configured to set the number of phase tracking reference signal antenna ports to be one for all other values of the transmitted precoding matrix indicator and transmit rank indicator.
7. A method in a wireless communication device, comprising:
receiving a signal that includes a radio network temporary identification (RNTI);
determining that a phase tracking reference signal is present based on the RNTI;
determining a number of phase tracking reference signal antenna ports to be used based on whether to use codebook or non-codebook based transmission; and
performing or causing to perform wireless communications, based on the phase tracking reference signal and using a modulation and coding scheme table selected based on the RNTI.
8. The method of claim 7 , wherein the phase tracking reference signal is present in response to determining that the RNTI is one of C-RNTI, CS-RNTI, SP-CSI-RNTI, or MCS-C-RNTI.
9. The method of claim 7 , wherein in response to determining to use non-codebook based transmission, setting the number of phase tracking reference signal antenna ports based on a sounding reference signal (SRS) resource.
10. The method of claim 7 , further comprising:
in response to determining to use codebook based transmission, setting a number of phase tracking reference signal antenna ports to be either one port or two ports depending on values of a transmitted precoding matrix indicator and a transmit rank indicator.
11. The method of claim 10 , further comprising setting the number of phase tracking reference signal antenna ports to be two in response to the value of the transmitted precoding matrix indicator value being zero and the value of the transmit rank indicator being one.
12. The method of claim 11 , further comprising setting the number of phase tracking reference signal antenna ports to be one for all other values of the transmitted precoding matrix indicator and transmit rank indicator.
13. A device for use in a wireless communication environment, comprising one or more processors configured to:
receive a signal that includes a radio network temporary identification (RNTI);
determine that a phase tracking reference signal is present based on the RNTI;
determine a number of phase tracking reference signal ports from the signal and based on whether to use codebook or non-codebook based transmission; and
receive the phase tracking reference signal using at least one of the phase tracking reference signal ports.
14. The device of claim 13 ,
wherein the signal further includes a transmitted precoding matrix indicator and a transmit rank indicator, and
wherein the number of phase tracking reference signal ports is determined depending on values of the transmitted precoding matrix indicator and the transmit rank indicator.
15. The device of claim 13 , wherein the one or more processors are further configured to:
report the number of phase tracking reference signal ports;
determine that the phase tracking reference signal is enabled; and
set a maximum number of phase tracking reference signal ports to be equal to the number of phase tracking reference signal ports.
16. The device of claim 13 , wherein the one or more processors are further configured to determine whether an association is set between a phase tracking reference signal port and a demodulation reference signal port for a grant based transmission.
17. The device of claim 16 , wherein the one or more processors are further configured to, in response to determining that there is no association, set a default association between the phase tracking reference signal port and the demodulation reference signal port.
18. The device of claim 17 , wherein the default association is based on a default value of an index of phase tracking reference signal and demodulation reference signal association.