RESPONSES TO MESSAGE B IN TWO STEP RANDOM ACCESS CHANNEL PROCEDURE
Systems, devices, and techniques for random access in a wireless communication network are described. A described technique performed by a user equipment (UE) includes transmitting a first message of a two-step random access procedure to a node of a wireless communication network; receiving, in response to the first message, a downlink control information (DCI) message via a physical downlink control channel (PDCCH) and a second message of the two-step random access procedure via a physical downlink shared channel (PDSCH) in accordance with the DCI message; determining, by the UE, a physical uplink control channel (PUCCH) resource based on the second message; and transmitting, by the UE, hybrid automatic repeat request-acknowledgement (HARQ-ACK) feedback for the second message on the determined PUCCH resource.
1 . A method comprising:
transmitting a first message of a two-step random access procedure to a node of a wireless communication network;
receiving, from the node in response to the first message, a second message of the two-step random access procedure via a physical downlink shared channel (PDSCH);
determining a physical uplink control channel (PUCCH) resource based on the second message; and
transmitting hybrid automatic repeat request—acknowledgement (HARQ-ACK) feedback for the second message on the determined PUCCH resource.
2 . The method of claim 1 , wherein the second message comprises an uplink grant field that indicates one or more resources, and wherein the determined PUCCH resource is based on the uplink grant field.
3 - 6 . (canceled)
7 . The method of claim 1 , comprising:
receiving, for a user equipment (UE), a DCI message on a control resource set (CORESET); and
using a same demodulation reference signal (DM-RS) antenna port quasi co-location properties as for a synchronization signal (SS) physical broadcast channel (PBCH) block the UE used for a physical random access channel (PRACH) association regardless of whether or not the UE is provided a transmission configuration indicator (TCI) state for the CORESET.
8 . The method of claim 1 , comprising:
receiving information that provides a configuration of a PUCCH resource set,
wherein the second message includes a PUCCH resource indicator field that identifies a resource within the PUCCH resource set, wherein the determined PUCCH resource is based on the PUCCH resource indicator field.
9 . (canceled)
10 . The method of claim 1 , wherein the second message includes a random access response (RAR) message, wherein the RAR message includes a PDSCH-to-HARQ feedback timing indicator field, and wherein transmitting the HARQ-ACK feedback comprises using a slot that is based on the PDSCH-to-HARQ feedback timing indicator field.
11 . The method of claim 1 , wherein transmitting the HARQ-ACK feedback comprises using a spatial domain transmission filter that was used in a last physical uplink shared channel (PUSCH) transmission from a user equipment for which the HARQ-ACK feedback was transmitted the UE.
12 . An apparatus comprising:
a transceiver; and
one or more processors coupled with the transceiver, wherein the one or more processors are configured to perform operations comprising:
transmitting, via the transceiver, a first message of a two-step random access procedure to a node of a wireless communication network;
receiving, via the transceiver from the node in response to the first message, a second message of the two-step random access procedure via a physical downlink shared channel (PDSCH);
determining a physical uplink control channel (PUCCH) resource based on the second message; and
transmitting, via the transceiver, hybrid automatic repeat request-acknowledgement (HARQ-ACK) feedback for the second message on the determined PUCCH resource.
13 . The apparatus of claim 12 , wherein the second message comprises an uplink grant field that indicates one or more resources, and wherein the determined PUCCH resource is based on the uplink grant field.
14 - 17 . (canceled)
18 . The apparatus of claim 12 , wherein the operations comprise:
receiving a DCI message on a control resource set (CORESET), and
using the same demodulation reference signal (DM-RS) antenna port quasi co-location properties as for a synchronization signal (SS) physical broadcast channel (PBCH) block a user equipment (UE) used for a physical random access channel (PRACH) association regardless of whether or not the UE is provided a transmission configuration indicator (TCI) state for the CORESET.
19 . The apparatus of claim 12 , wherein the operations comprise:
receiving information that provides a configuration of a PUCCH resource set,
wherein the second message includes a PUCCH resource indicator field that identifies a resource within the PUCCH resource set, wherein the determined PUCCH resource is based on the PUCCH resource indicator field.
20 . The apparatus of claim 12 , wherein the second message includes a HARQ feedback timing indicator.
21 . The apparatus of claim 12 , wherein the second message includes a random access response (RAR) message, wherein the RAR message includes a PDSCH-to-HARQ feedback timing indicator field, and wherein transmitting the HARQ-ACK feedback comprises using a slot that is based on the PDSCH-to-HARQ feedback timing indicator field.
22 . The apparatus of claim 12 , wherein transmitting the HARQ-ACK feedback comprises using a spatial domain transmission filter that was used in a last physical uplink shared channel (PUSCH) transmission from a user equipment (UE).
23 . A system comprising:
a transceiver to communicate with a user equipment (UE); and
a processor coupled with the transceiver, wherein the processor is configured to perform operations comprising:
receiving, via the transceiver, a first message of a two-step random access procedure from the UE;
transmitting, via the transceiver, a second message of the two-step random access procedure on a physical downlink shared channel (PDSCH), wherein the second message provides information to the UE to determine PUCCH resources; and
receiving, via the transceiver, hybrid automatic repeat request-acknowledgement (HARQ-ACK) feedback for the second message from the UE in accordance with the PUCCH resources.
24 . The system of claim 23 , wherein the second message comprises an uplink grant field that indicates one or more PUCCH resources.
25 - 28 . (canceled)
29 . The system of claim 23 , wherein the operations comprise transmitting a DCI message on a control resource set (CORESET), wherein transmitting the second message comprises transmitting the second message such that the UE uses the same demodulation reference signal (DM-RS) antenna port quasi co-location properties as for a synchronization signal (SS) physical broadcast channel (PBCH) block the UE used for a physical random access channel (PRACH) association regardless of whether or not the UE is provided a transmission configuration indicator (TCI) state for the CORESET.
30 . The system of claim 23 , wherein the operations comprise transmitting information that provides a configuration of a PUCCH resource set, and wherein the second message includes a PUCCH resource indicator field that identifies a resource within the PUCCH resource set.
31 . The system of claim 23 , wherein the second message includes a HARQ feedback timing indicator.
32 . The system of claim 23 , wherein the second message includes a random access response (RAR) message, wherein the RAR message includes a PDSCH-to-HARQ feedback timing indicator field, and wherein receiving the HARQ-ACK feedback comprises receiving the HARQ-ACK feedback in a slot that is based on the PDSCH-to-HARQ feedback timing indicator field.
33 . The system of claim 23 , wherein receiving the HARQ-ACK feedback comprises receiving the HARQ-ACK feedback that was transmitted by the UE using a spatial domain transmission filter, wherein the spatial domain transmission filter was used in a last physical uplink shared channel (PUSCH) transmission from the UE.