Preamble partitioning and mapping for pusch in rach with occ

Patent metadata

Field	Value
Publication number	US-2025274972-A1
Application number	US-202418589349-A
Country	US
Kind code	A1
Filing date	Feb 27, 2024
Priority date	Feb 27, 2024
Publication date	Aug 28, 2025
Grant date	—

Abstract

The apparatus may be a wireless device configured to receive a configuration for a partitioning of a set of RACH resources between a first class of wireless devices supporting OCC for data transmission during a RACH procedure and a second class of wireless devices not supporting OCC for data transmission, transmit, based on the configuration, a preamble associated with the RACH procedure via a first RACH resource in the set of RACH resources that is associated with the first class of wireless devices, and transmit a data transmission associated with the RACH procedure via a second RACH resource in the set of RACH resources selected based on a mapping of the preamble and at least one of a multiplexing order and an OCC index associated with an OCC applied to the data transmission.

First claim

What is claimed is:

1 . An apparatus for wireless communication at a network device, comprising:
at least one memory; and at least one processor coupled to the at least one memory and, based at least in part on stored information that is stored in the at least one memory, the at least one processor, individually or in any combination, is configured to:
transmit, to a user equipment (UE), a configuration for a partitioning of a set of random access channel (RACH) resources between a first class of wireless devices supporting orthogonal cover codes (OCC) for data transmission during a RACH procedure and a second class of wireless devices not supporting the OCC for data transmission during the RACH procedure;
receive, based on the configuration, a preamble associated with the RACH procedure via a first RACH resource in the set of RACH resources that is associated with the first class of wireless devices;
monitor a second RACH resource in the set of RACH resources for a data transmission associated with the RACH procedure based on the preamble, a multiplexing order, and an OCC index associated with the OCC applied to the data transmission; and
transmit, when the data transmission is received based on the monitoring of the second RACH resource, an additional message of the RACH procedure.

2 . The apparatus of claim 1 , wherein:
the set of RACH resources includes preamble sequences and the preamble associated with the RACH procedure is selected from a first set of preamble sequences associated with the first class of wireless devices; or the set of RACH resources includes RACH occasions (ROs) and the first RACH resource is a first RO associated with the first class of wireless devices.

3 . The apparatus of claim 1 , wherein the configuration for the partitioning of the set of RACH resources is indicated in one of a system information block (SIB) or a radio resource control (RRC) message.

4 . The apparatus of claim 1 , wherein the second RACH resource is in a subset of RACH physical uplink shared channel (PUSCH) occasions (POs) associated with the first class of wireless devices.

5 . The apparatus of claim 1 , wherein the RACH procedure is a two-step RACH procedure and the preamble and the data transmission are associated with a first message of a first step of the two-step RACH procedure, wherein the first message indicates the multiplexing order and a row of an OCC matrix associated with the data transmission, and wherein the OCC index is mapped to a combination of the multiplexing order and the row of the OCC matrix.

6 . The apparatus of claim 5 , wherein the second RACH resource is associated with a demodulation reference signal (DMRS) resource identifier value, wherein the DMRS resource identifier value is mapped to at least one of a DMRS port number, a code division multiplexing group number, a sequence number, or the OCC index.

7 . The apparatus of claim 6 , wherein the preamble is mapped to the second RACH resource for the data transmission based on one or more of:
a frequency resource index for a frequency multiplexed PO; the OCC index; the DMRS resource identifier value; a time resource index for time multiplexed POs; and an index for a configured number of PUSCH slots.

8 . The apparatus of claim 1 , wherein the RACH procedure is a four-step RACH procedure and the preamble is associated with a first message of the four-step RACH procedure and the data transmission is associated with a third message of the four-step RACH procedure.

9 . The apparatus of claim 8 , further comprising a transceiver coupled to the at least one processor, wherein the at least one processor, individually or in any combination, is further configured to:
transmit, to the UE via the transceiver in a second message of the four-step RACH procedure, an indication of the multiplexing order and the OCC index associated with the OCC applied to the data transmission associated with the third message.

10 . An apparatus for wireless communication at a wireless device, comprising:
at least one memory; and at least one processor coupled to the at least one memory and, based at least in part on stored information that is stored in the at least one memory, the at least one processor, individually or in any combination, is configured to:
receive a configuration for a partitioning of a set of random access channel (RACH) resources between a first class of wireless devices supporting orthogonal cover codes (OCC) for data transmission during a RACH procedure and a second class of wireless devices not supporting the OCC for data transmission;
transmit, based on the configuration, a preamble associated with the RACH procedure via a first RACH resource in the set of RACH resources that is associated with the first class of wireless devices; and
transmit a data transmission associated with the RACH procedure via a second RACH resource in the set of RACH resources selected based on a mapping of the preamble and at least one of a multiplexing order and an OCC index associated with the OCC applied to the data transmission.

11 . The apparatus of claim 10 , wherein the at least one processor, individually or in any combination, is further configured to:
determine that the wireless device belongs to the first class of wireless devices; and select the preamble based on the determination that the wireless device belongs to the first class of wireless devices.

12 . The apparatus of claim 10 , wherein:
the set of RACH resources includes preamble sequences and the preamble associated with the RACH procedure is selected from a first set of preamble sequences associated with the first class of wireless devices; or the set of RACH resources includes RACH occasions (ROs) and the first RACH resource is a first RO associated with the first class of wireless devices.

13 . The apparatus of claim 10 , wherein the configuration for the partitioning of the set of RACH resources is indicated in one of a system information block (SIB) or a radio resource control (RRC) message.

14 . The apparatus of claim 10 , wherein the second RACH resource in the set of RACH resources is in a subset of RACH physical uplink shared channel (PUSCH) occasions (POs) associated with the first class of wireless devices.

15 . The apparatus of claim 10 , wherein the RACH procedure is a two-step RACH procedure and the preamble and the data transmission are associated with a first message of a first step of the two-step RACH procedure, wherein the first message indicates the multiplexing order and a row of an OCC matrix associated with the data transmission, and wherein the OCC index is mapped to a combination of the multiplexing order and the row of the OCC matrix.

16 . The apparatus of claim 15 , wherein the second RACH resource is associated with a demodulation reference signal (DMRS) resource identifier value, wherein the DMRS resource identifier value is mapped to at least one of a DMRS port number, a code division multiplexing group number, a sequence number, or the OCC index.

17 . The apparatus of claim 16 , wherein the preamble is mapped to the second RACH resource for the data transmission based on one or more of:
a frequency resource index for a frequency multiplexed PO; the OCC index; the DMRS resource identifier value; a time resource index for time multiplexed POs; and an index for a configured number of PUSCH slots.

18 . The apparatus of claim 10 , wherein the RACH procedure is a four-step RACH procedure and the preamble is associated with a first message of the fou

Assignees

• Qualcomm Inc

Inventors

• Shah Syed Hashim Ali
• Saha Chiranjib
• Rico Alvarino Alberto

Classifications

• H04W74/0833

  Random access procedures, e.g. with 4-step access · CPC title

• H04W74/002 Primary

  Transmission of channel access control information · CPC title

• H04W74/0836

  with 2-step access · CPC title

• H04W72/566

  of the information or information source or recipient · CPC title

• H04W74/006 Primary

  in the downlink, i.e. towards the terminal · CPC title