# US 12,004,237 B2 · Method and apparatus for spatial setting determination during a random access procedure

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- Number: US 12,004,237 B2
- Document ID: US12004237B2
- Status: Granted
- Kind: B2
- Application number: 17/447,564
- Filed: 2021-09-13
- Published: 2022-03-24
- Granted: 2024-06-04
- Earliest claimed: 2020-09-21
- Assignees: Samsung Electronics Co., Ltd.
- Applicants: Samsung Electronics Co., Ltd.
- Inventors: Carmela Cozzo; Aristides Papasakellariou; Emad N. Farag
- Web page: https://patentgrep.com/patent/US12004237B2

## CPC

- H04W 74/085: {collision avoidance}
- H04L 5/0048: {Allocation of pilot signals, i.e. of signals known to the receiver (allocation of control signalling H04L5/0053; use of control signalling H04L5/0091)}
- H04L 5/0053: {Allocation of signalling, i.e. of overhead other than pilot signals}
- H04W 72/23: in the downlink direction of a wireless link, i.e. towards a terminal
- H04W 74/002: {Transmission of channel access control information}
- H04W 74/0833: Random access procedures, e.g. with 4-step access
- H04W 74/0836: with 2-step access
- H04W 74/0838: using contention-free random access [CFRA]
- H04W: WIRELESS COMMUNICATION NETWORKS (broadcast communication H04H; communication systems using wireless links for non-selective communication, e.g. wireless extensions H04M1/72)
- H04L: TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION (arrangements common to telegraphic and telephonic communication H04M)

## Abstract

Methods and apparatuses for determining spatial settings during a random access procedure. A method for operating a user equipment includes determining a first physical random access channel (PRACH) preamble for transmission in a first PRACH occasion (RO) using a first spatial setting and determining a second PRACH preamble for transmission in a second RO using a second spatial setting. The method further includes transmitting the first PRACH preamble in the first RO using the first spatial setting and transmitting the second PRACH preamble in the second RO using the second spatial setting. The method further includes receiving a first physical downlink control channel (PDCCH) scheduling a reception of a first physical downlink shared channel (PDSCH) using a third spatial setting associated with the first spatial setting, or a second PDCCH scheduling a reception of a second PDSCH using a fourth spatial setting associated with the second spatial setting.

## Claims

### Claim 1

A user equipment (UE) comprising:
a processor configured to determine:
a first physical random access channel (PRACH) preamble for transmission in a first PRACH occasion (RO) using a first spatial setting, and
a second PRACH preamble for transmission in a second RO using a second spatial setting; and
a transceiver operably connected to the processor, the transceiver configured to:
transmit:
the first PRACH preamble in the first RO using the first spatial setting, and
the second PRACH preamble in the second RO using the second spatial setting; and
receive:
a physical downlink control channel (PDCCH) scheduling a reception of a first physical downlink shared channel (PDSCH), wherein the PDSCH provides a random access response (RAR) message associated with the first and second PRACH preamble transmissions, wherein:
the RAR message schedules transmission of a first physical uplink shared channel (PUSCH), and
the RAR message includes information for using a spatial setting from the first spatial setting or the second spatial setting for transmission of the PUSCH, and
the transceiver is further configured to transmit a first PUSCH and any PUSCH after the first PUSCH using the spatial setting until reception of information indicating use of a different spatial setting.

### Claim 2 (depends on 1)

The UE of claim 1, wherein the transceiver is further configured to:
receive information in the RAR message for a fifth spatial setting of a PUSCH transmission, wherein the PUSCH transmission is scheduled by the RAR message; and
transmit the PUSCH using the fifth spatial setting.

### Claim 3 (depends on 1)

The UE of claim 1, wherein the first PUSCH transmission is scheduled by the RAR message.

### Claim 4 (depends on 1)

The UE of claim 1, wherein:
the transceiver is further configured to receive a system information block (SIB) that provides a mapping between a set of ROs and a set of reference signal (RS) configurations; and
the processor is further configured to determine the first and second spatial settings based on the mapping.

### Claim 5 (depends on 4)

The UE of claim 4, wherein the processor is further configured to determine the first and second ROs based on the respective first and second spatial settings.

### Claim 6

A base station (BS) comprising:
a processor configured to determine:
a first physical random access channel (PRACH) preamble for transmission in a first PRACH occasion (RO) using a first spatial setting, and
a second PRACH preamble for transmission in a second RO using a second spatial setting; and
a transceiver operably connected to the processor, the transceiver configured to:
receive:
the first PRACH preamble in the first RO using the first spatial setting, and
the second PRACH preamble in the second RO using the second spatial setting; and
transmit:
a physical downlink control channel (PDCCH) scheduling a transmission of a first physical downlink shared channel (PDSCH), wherein the PDSCH provides a random access response (RAR) message associated with the first and second PRACH preamble receptions, wherein:
the RAR message schedules transmission of a physical uplink shared channel (PUSCH), and
the RAR message includes information for using a spatial setting from the first spatial setting or the second spatial setting for transmission of the PUSCH, and
the transceiver is further configured to receive a first PUSCH and any PUSCH after the first PUSCH using the spatial setting until reception of information indicating use of a different spatial setting.

### Claim 7 (depends on 6)

The BS of claim 6, wherein the transceiver is further configured to:
transmit information in the RAR message for a fifth spatial setting of a PUSCH transmission, wherein the PUSCH transmission is scheduled by the RAR message; and
receive the PUSCH using the fifth spatial setting.

### Claim 8 (depends on 6)

The BS of claim 6, wherein the first PUSCH reception is scheduled by the RAR message.

### Claim 9 (depends on 6)

The BS of claim 6, wherein:
the transceiver is further configured to transmit a system information block (SIB) that provides a mapping between a set of ROs and a set of reference signal (RS) configurations; and
the processor is further configured to determine the first and second spatial settings based on the mapping.

### Claim 10 (depends on 9)

The BS of claim 9, wherein the processor is further configured to determine the first and second ROs based on the respective first and second spatial settings.

### Claim 11

A method comprising:
determining a first physical random access channel (PRACH) preamble for transmission in a first PRACH occasion (RO) using a first spatial setting;
determining a second PRACH preamble for transmission in a second RO using a second spatial setting;
transmitting the first PRACH preamble in the first RO using the first spatial setting;
transmitting the second PRACH preamble in the second RO using the second spatial setting;
receiving:
a physical downlink control channel (PDCCH) scheduling a reception of a first physical downlink shared channel (PDSCH), wherein the PDSCH provides a random access response (RAR) message associated with the first and second PRACH preamble transmissions, wherein:
the RAR message schedules transmission of a physical uplink shared channel (PUSCH), and
the RAR message includes information for using a spatial setting from the first spatial setting or the second spatial setting for transmission of the PUSCH; and
transmitting a first PUSCH and any PUSCH after the first PUSCH using the spatial setting until reception of information indicating use of a different spatial setting.

### Claim 12 (depends on 11)

The method of claim 11, further comprising:
receiving information in the RAR message for a fifth spatial setting of a physical uplink shared channel (PUSCH) transmission, wherein the PUSCH transmission is scheduled by the RAR message; and
transmitting the PUSCH using the fifth spatial setting.

### Claim 13 (depends on 11)

The method of claim 11, further comprising: wherein the first PUSCH transmission is scheduled by the RAR message.

### Claim 14 (depends on 11)

The method of claim 11, further comprising:
receiving a system information block (SIB) that provides a mapping between a set of ROs and a set of reference signal (RS) configurations; and
determining the first and second spatial settings based on the mapping.

### Claim 15 (depends on 14)

The method of claim 14, further comprising determining the first and second ROs based on the respective first and second spatial settings.