# US 12,193,067 B2 · Method and apparatus of determining RA-RNTI and user equipment

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- Number: US 12,193,067 B2
- Document ID: US12193067B2
- Status: Granted
- Kind: B2
- Application number: 17/717,162
- Filed: 2022-04-11
- Published: 2022-07-28
- Granted: 2025-01-07
- Earliest claimed: 2019-10-15
- Assignees: Guangdong Oppo Mobile Telecommunications Corp., Ltd.
- Applicants: Guangdong Oppo Mobile Telecommunications Corp., Ltd.
- Inventors: Zuomin Wu
- Web page: https://patentgrep.com/patent/US12193067B2

## CPC

- H04W 74/0833: Random access procedures, e.g. with 4-step access
- H04W: WIRELESS COMMUNICATION NETWORKS (broadcast communication H04H; communication systems using wireless links for non-selective communication, e.g. wireless extensions H04M1/72)

## Abstract

Disclosed is a method of determining a random access radio network temporary identifier (RA-RNTI) and related product. In the method, a first indication of a plurality of frequency domain random access occasions (ROs) M_RO over which physical random access channel (PRACH preamble) is transmitted is obtained, a second indication about a set of PRACH sequence candidates to be selected for PRACH preamble transmission is obtained, an initial RO index is determined; and the RA-RNTI is determined based on the initial RO index and the PRACH sequence transmitted over the M_RO.

## Claims

### Claim 1

A method of determining a random access radio network temporary identifier (RA-RNTI), executed by a user equipment (UE), comprising:
obtaining a first indication of a plurality of frequency domain random access occasions (ROs) M_RO over which physical random access channel (PRACH) preamble is transmitted;
obtaining a second indication about a set of PRACH sequence candidates to be selected for PRACH preamble transmission;
determining an initial RO index; and
determining the RA-RNTI based on the initial RO index and a PRACH sequence transmitted over the plurality of frequency domain ROs M_RO, wherein the UE determines the RA-RNTI such that a value of the RA-RNTI has a first pre-defined relationship between on the initial RO index and a first offset, where the first offset has a second relationship with the transmitted PRACH sequence over the plurality of frequency domain ROs M_RO, wherein the first pre-defined relationship is RA-RNTI=1+s_id+14×t_id+14×80×f_id_nru+14×80×8×ul_carrier_id,
where s_id is an index of a first OFDM symbol of a PRACH occasion, 0≤s_id<14, t_id is an index of a first slot of the PRACH occasion in a system frame, 0≤t_id<80, f_id nru is an index of NRU PRACH occasion in a frequency domain, 0<f_id_nru <8, and ul_carrier_id is a UL carrier used for Random Access Preamble transmission, ul_carrier_id is 0 for NUL carrier, and ul_carrier_id is 1 for SUL carrier, and f_id_nru is derived by the initial RO index and the PRACH sequence transmitted over the plurality of frequency domain ROs M_RO according to the second relationship.

### Claim 2 (depends on 1)

The method according to claim 1, wherein the plurality of frequency domain ROs M_RO have different frequency domain RO indexes or a same frequency domain RO index.

### Claim 3 (depends on 2)

The method according to claim 2, wherein the UE determines the initial RO index such that:
if the plurality of frequency domain ROs M_RO have the different frequency domain RO indexes, the initial RO index is a smallest RO index among them; or a largest RO index among them;
if the plurality of frequency domain ROs M_RO have the same frequency domain RO index, the initial RO index is the frequency domain RO index.

### Claim 4 (depends on 1)

The method according to claim 1, wherein the second relationship between the first offset and the PRACH sequence is derived by a PRACH sequence group, such that different PRACH sequences is divided into multiple groups, and each of the groups represents an offset value.

### Claim 5 (depends on 4)

The method according to claim 4, wherein the offset value is group ID, or other pre-defined values linked to the group ID with pre-defined mapping.

### Claim 6

An apparatus of determining a random access radio network temporary identifier (RA-RNTI), comprising:
an obtaining unit, configured to obtain a first indication of a plurality of frequency domain random access occasions (ROs) M_RO over which physical random access channel (PRACH) preamble is transmitted, and obtain a second indication about a set of PRACH sequence candidates to be selected for PRACH preamble transmission; and
a determination unit, configured to determine an initial RO index, and determine the RA-RNTI based on the initial RO index and the PRACH sequence transmitted over the plurality of frequency domain ROs M_RO, wherein the determination unit is configured to determine the RA-RNTI such that a value of the RA-RNTI has a first pre-defined relationship between on the initial RO index and a first offset, where the first offset has a second relationship with the transmitted PRACH sequence over the plurality of frequency domain ROs M_RO, wherein the first pre-defined relationship is RA-RNTI=1+s_id+14×t_id+14×80×f_id_nru+14×80×8×ul_carrier_id,
where s_id is an index of a first OFDM symbol of a PRACH occasion, 0≤s_id<14, t_id is an index of a first slot of the PRACH occasion in a system frame, 0≤t_id<80, f_id_nru is an index of an NRU PRACH occasion in the frequency domain, 0≤f_id_nru<8, and ul_carrier_id is a UL carrier used for Random Access Preamble transmission, ul_carrier_id is 0 for NUL carrier, and ul carrier id is 1 for SUL carrier, and f_id_nru is derived by the initial RO index and the PRACH sequence transmitted over the plurality of frequency domain M_RO according to the second relationship.

### Claim 7 (depends on 6)

The apparatus according to claim 6, wherein the plurality of frequency domain ROs M_RO have different frequency domain RO indexes or a same frequency domain RO index.

### Claim 8 (depends on 7)

The apparatus according to claim 7, wherein the determination unit is configured to determine the initial RO index such that:
if the plurality of frequency domain ROs M_RO have the different frequency domain RO indexes, the initial RO index is a smallest RO index among them; or a largest RO index among them;
if the plurality of frequency domain ROs M_RO have the same frequency domain RO index, the initial RO index is a frequency domain RO index.

### Claim 9 (depends on 6)

The apparatus according to claim 6, wherein the second relationship between the first offset and the PRACH sequence is derived by a PRACH sequence group, such that different PRACH sequences is divided into multiple groups, and each of the groups represents an offset value.

### Claim 10 (depends on 9)

The apparatus according to claim 9, wherein the offset value is group ID, or other pre-defined values linked to the group ID with pre-defined mapping.

### Claim 11

A user equipment (UE), comprising:
a memory storing a computer program; and
a processor, adapted to call and execute the computer program stored in the memory to execute:
obtaining a first indication of a plurality of frequency domain random access occasions (ROs) M_RO over which physical random access channel (PRACH) preamble is transmitted;
obtaining a second indication about a set of PRACH sequence candidates to be selected for PRACH preamble transmission;
determining an initial RO index; and
determining the RA-RNTI based on the initial RO index and a PRACH sequence transmitted over the plurality of frequency domain ROs M_RO, wherein the processor determines the RA-RNTI such that a value of the RA-RNTI has a first pre-defined relationship between on the initial RO index and a first offset, where the first offset has a second relationship with the transmitted PRACH sequence over the plurality of frequency domain ROs M_RO, wherein the first pre-defined relationship is RA-RNTI=1+s_id+14×t_id+14×80×f_id_nru+14×80×8×ul_carrier_id,
where s_id is an index of a first OFDM symbol of a PRACH occasion, 0≤s_id<14, t_id is an index of a first slot of the PRACH occasion in a system frame, 0≤t_id<80, f_id_nru is an index of NRU PRACH occasion in a frequency domain, 0≤f_id_nru<8, and ul_carrier_id is a UL carrier used for Random Access Preamble transmission, ul_carrier_id is 0 for NUL carrier, and ul_carrier_id is 1 for SUL carrier, and f_id_nru is derived by the initial RO index and the PRACH sequence transmitted over the plurality of frequency domain ROs M_RO according to the second relationship.

### Claim 12 (depends on 11)

The UE according to claim 11, wherein the plurality of frequency domain ROs M_RO have different frequency domain RO indexes or a same frequency domain RO index.

### Claim 13 (depends on 12)

The UE according to claim 12, wherein the processor determines the initial RO index such that:
if the plurality of frequency domain ROs M_RO have the different frequency domain RO indexes, the initial RO index is a smallest RO index among them; or a largest RO index among them;
if the plurality of frequency domain ROs M_RO have the same frequency domain RO index, the initial RO index is the frequency domain RO index.

### Claim 14 (depends on 11)

The UE according to claim 11, wherein the second relationship between the first offset and the PRACH sequence is derived by a PRACH sequence group, such that different PRACH sequences is divided into multiple groups, and each of the groups represents an offset value.

### Claim 15 (depends on 14)

The UE according to claim 14, wherein the offset value is group ID, or other pre-defined values linked to the group ID with pre-defined mapping.