Time and frequency tracking reference signals in new radio
A wireless transmit/receive unit (WTRU) may receive a tracking reference signal comprising resources located in one or more slots. The resources may be located in one or more symbols used for receiving a demodulation reference signal. The one or more symbols in which the resources of the tracking reference signal are located may be within a first five symbols in each of the one or more slots. At least one resource of the received tracking reference signal may be frequency multiplexed with the demodulation reference signal.
1 . A wireless transmit/receive unit (WTRU) comprising a processor and memory, the processor and memory configured to:
receive configuration information for a tracking reference signal, the configuration information indicating resources associated with reception of the tracking reference signal, wherein the resources correspond to one or more symbols of one or more slots;
determine that a control resource set (CORESET) overlaps with at least one of the one or more symbols corresponding to the resources associated with the tracking reference signal; and
receive the tracking reference signal in the at least one of the one of more symbols overlapping with the CORESET, wherein the tracking reference signal is received in the at least one of the one or more symbols in a region outside of the CORESET, and the tracking reference signal is not received in a region corresponding to the CORESET.
2 . The WTRU of claim 1 , wherein the configuration information is received via a radio resource control (RRC) message.
3 . The WTRU of claim 2 , wherein the RRC message further comprises configuration information for the CORESET.
4 . The WTRU of claim 2 , wherein the processor and memory are configured to:
receive downlink control information indicating that the WTRU is to receive the tracking reference signal.
5 . The WTRU of claim 4 , wherein the DCI indicates a particular tracking reference signal configuration out of a plurality of configured tracking reference signal configurations.
6 . The WTRU of claim 5 , wherein the plurality of tracking reference signal configurations are indicated via the RRC message.
7 . The WTRU of claim 1 , wherein the tracking reference signal is associated with a sequence, and the sequence is generated via PN generator initialed based at least on a symbol index.
8 . A method implemented by a wireless transmit/receive unit (WTRU), the method comprising:
receiving configuration information for a tracking reference signal, the configuration information indicating resources associated with reception of the tracking reference signal, wherein the resources correspond to one or more symbols of one or more slots;
determining that a control resource set (CORESET) overlaps with at least one of the one or more symbols corresponding to the resources associated with the tracking reference signal; and
receiving the tracking reference signal in the at least one of the one of more symbols overlapping with the CORESET, wherein the tracking reference signal is received in the at least one of the one or more symbols in a region outside of the CORESET, and the tracking reference signal is not received in a region corresponding to the CORESET.
9 . The method of claim 8 , wherein the configuration information is received via a radio resource control (RRC) message.
10 . The method of claim 9 , wherein the RRC message further comprises configuration information for the CORESET.
11 . The method of claim 9 , further comprising:
receiving downlink control information indicating that the WTRU is to receive the tracking reference signal.
12 . The method of claim 11 , wherein the DCI indicates a particular tracking reference signal configuration out of a plurality of configured tracking reference signal configurations.
13 . The method of claim 12 , wherein the plurality of tracking reference signal configurations are indicated via the RRC message.
14 . The method of claim 8 , wherein the tracking reference signal is associated with a sequence, and the sequence is generated via PN generator initialed based at least on a symbol index.
15 . A base station comprising a transceiver configured to:
transmit configuration information for a tracking reference signal to a wireless transmit/receive unit (WTRU), the configuration information indicating resources associated with transmission of the tracking reference signal, wherein the resources correspond to one or more symbols of one or more slots;
transmit the tracking reference signal in at least one of the one of more symbols, wherein a control resource set (CORESET) overlaps with the at least one of the one or more symbols corresponding to the resources associated with the tracking reference signal, the tracking reference signal is transmitted in the at least one of the one or more symbols in a region outside of the CORESET, and the tracking reference signal is not transmitted in a region corresponding to the CORESET.
16 . The base station of claim 15 , wherein the configuration information is transmitted via a radio resource control (RRC) message.
17 . The base station of claim 16 , wherein the RRC message further comprises configuration information for the CORESET.
18 . The base station of claim 16 , wherein the transceiver is configured to:
transmit downlink control information indicating that the WTRU is to receive the tracking reference signal.
19 . The base station of claim 18 , wherein the DCI indicates a particular tracking reference signal configuration out of a plurality of configured tracking reference signal configurations.
20 . The base station of claim 19 , wherein the plurality of tracking reference signal configurations are indicated via the RRC message.