US 2022/0190906 A1 · METHODS FOR MSG-B IN TWO-STEP RACH

Abstract

Methods and apparatus for transmitting a hybrid automatic repeat request acknowledgment (HARQ-ACK) are disclosed. A wireless transmit/receive unit (WTRU) may transmit a random access channel (RACH) message-A to a gNB. The WTRU may receive a RACH message-B from the gNB in response to the message-A. The message-B may comprise downlink control information (DCI). The WTRU may decode a physical downlink shared channel (PDSCH) based on the DCI. The WTRU may determine that contention resolution is successful. The WTRU may determine a resource for a physical uplink control channel (PUCCH). The WTRU may transmit a HARQ-ACK over the determined PUCCH resource. The WTRU may determine the resource for the PUCCH based on a PUCCH resource index. The PUCCH resource index may be based on a random access preamble index (RAPID) and a PUCCH resource indicator (PRI).

Claims14

Dependent claims

A method implemented by a wireless transmit receive unit (WTRU) for beam failure recovery (BFR), the method comprising:

detecting beam failure on a serving cell;
receiving a set of reference signals corresponding to a set of beams;
determining information indicating a subset of the set of reference signals based on one or more measurements;
transmitting a first message including a preamble and a payload, wherein the payload includes an index of each reference signal in the subset of reference signals;
and
receiving a second message, wherein the second message is a Random Access (RA) response to the first message, wherein on a condition that the second message includes a cell radio network temporary identity (C-RNTI) of the WTRU, determining that BFR is successful.

3 more elements

Dependencies are inferred from the claim text.

Methods for msg-b in two-step rach

Life of this patent

Methods for msg-b in two-step rach

Life of this patent

Abstract

Claims14