>PRACH

PRACH
occasions

PRACH

slots
within a
N_dur^RA,

configuration
Preamble
n_SFNmod x = y
Subframe
Starting
within a
PRACH
PRACH

index
format
x
y
number
symbol
subframe
slot
duration

0
0
16
1
9
0
—
—
0

1
0
8
1
9
0
—
—
0

2
0
4
1
9
0
—
—
0

3
0
2
0
9
0
—
—
0

4
0
2
1
9
0
—
—
0

. . .
. . .
. . .
. . .
. . .
. . .
. . .
. . .
. . .

TABLE 3

Random access configurations for an FR 2 and an unpaired spectrum

N_t^RA,slot,

number of

time-

Number of
domain

PRACH
PRACH

Slot

slots
occasions

PRACH

number

within a
within a
N_dur^RA,

Config.
Preamble
n_SFNmod x = y
(Slot
Starting
60-kHz
PRACH
PRACH

Index
format
x
y
number)
symbol
slot
slot
duration

0
A1
16
1
4, 9, 14,
0
2
6
2

19, 24, 29,

34, 39

1
A1
16
1
3, 7, 11,
0
1
6
2

15, 19, 23,

27, 31, 35,

39

2
A1
8
1, 2
9, 19, 29,
0
2
6
2

39

3
A1
8
1
4, 9, 14,
0
2
6
2

19, 24, 29,

34, 39

4
A1
8
1
3, 7, 11,
0
1
6
2

15, 19, 23,

27, 31, 35,

39

. . .
. . .
. . .
. . .
. . .
. . .
. . .
. . .
. . .

For the FR 1, a slot in the FR 1 uses a 15-kHz subcarrier spacing as a reference. For the FR 2, a slot in the FR 2 uses a 60-kHz subcarrier spacing as a reference.

Meanings of the parameters in the foregoing three tables are as follows:

PRACH Configuration Index refers to an index value of RO configuration, and is configured by Radio Resource Control (RRC) signaling.

Preamble format refers to a used Preamble format.

n_SFNmod x=y refers to a radio frame position of an RO. For example, n_SFNmod 1=0 represents that a preamble may be transmitted in each radio frame.

Subframe/Slot number refers to a sequence number of a subframe or a slot in which an RO is located within a radio frame of which transmission is allowed.

Starting symbol refers to a sequence number of a starting symbol number of a first RO in time domain in each subframe/60-kHz slot including ROs.

Number of PRACH slots within a subframe/60-kHz slot refers to the number of PRACH slots included within a subframe/60-kHz slot.

$N_{t}^{RA, slot}$

refers to the number of ROs included within a PRACH slot, that is, the number of time domain transmission opportunities of a preamble.

$N_{dur}^{RA}$

refers to the number of OFDM symbols occupied by an RO.

It may be calculated, based on the foregoing parameter set, that a position of a starting OFDM symbol of each RO included within a PRACH slot within a reference slot is:

$1 = 1_{0} + n_{t}^{RA} N_{dur}^{RA} + 14 n_{{slot}^{'}}^{RA}$

- where
- l₀is a starting symbol;

$n_{t}^{RA}$

- is an

$n_{t}^{RAth}$

- PRACH occasion within a PRACH slot, and has a sequence number being 0 to

$N_{t}^{RA, slot} - 1$

- sequentially;

$N_{dur}^{R A}$

- is the number of OFDM symbols occupied by a PRACH occasion in time domain; and
- in a case that Δf_RA∈{1.25,5,15,60} kHz, a slot sequence number of a PRACH slot within a reference slot is

$n_{slot}^{RA} = 0;$

- in a case that Δf_RA∈{30,120} kHz and the number of PRACH slots within a subframe is equal to 1 or the number of PRACH slots within 60-kHz slot is equal to 1, a slot sequence number of a PRACH slot within a reference slot is

$n_{slot}^{RA} = 1;$

- or in other cases a slot sequence number of a PRACH slot within a reference slot is

$n_{slot}^{RA} \in {0, 1} .$

For example, it is assumed that an FR 2 and an unpaired spectrum/SUL are used and a subcarrier spacing of a preamble is 120 kHz. In a case that an indicated PRACH Configuration Index is equal to 74, it is obtained through table lookup that in this configuration, UE can transmit a preamble in a format A3 in only slots (9, 19, 29, 39) of system frames that satisfy n_SFN%1=0 (that is, all system frames) (for the FR 2, slots are numbered with a subcarrier spacing of 60 kHz as a reference). One slot includes two consecutive PRACH slots (the value of a corresponding Number of PRACH slots within a 60-kHz slot is 2). One PRACH slot includes

$N_{t}^{RA, slot} = 1$

ROs in time domain. Each RO occupies

$N_{dur}^{RA} = 6$

OFDM symbols, and a PRACH is transmitted starting from an eighth OFDM symbol (the value of a corresponding Starting symbol is 7) of each PRACH slot.

TABLE 4

Random access configurations for an FR 2 and an unpaired spectrum

N_t^RA,slot,

number of

time-

Number of
domain

PRACH
PRACH

slots
occasions

PRACH

within a
within a
N_dur^RA,

Config.
Preamble
n_SFNmod x = y
Subframe
Starting
60-kHz
PRACH
PRACH

Index
format
x
y
number
symbol
slot
slot
duration

74
A3
1
0
9, 19, 29,
7
2
1
6

39

Because Δf_RA=120 kHz and the number of PRACH slots within 60-kHz slot is equal to 2, a slot sequence number of a PRACH slot within a reference slot is

$n_{slot}^{RA} \in {0, 1} .$

It may be calculated, based on the foregoing parameter set, that a position of a starting OFDM symbol of each RO included within a PRACH slot within a reference slot is:

$1 = 1_{0} + n_{t}^{RA} N_{dur}^{RA} + 1 4 n_{slot}^{R A} = 7 + 0 \times 6 + 1 4 \times {0, 1} = [7, 2 1} .$

A large PRACH SCS is introduced into the related art. According to a current protocol configuration, a subcarrier spacing of a reference slot of an FR 1 is 15 kHz, and a supported PRACH subcarrier spacing is (15, 30) kHz. A subcarrier spacing of a reference slot of an FR 2 is 60 kHz, and a supported PRACH subcarrier spacing is {60, 120} kHz. In a case that an SCS is greater than 120 kHz, even if a 60-kHz subcarrier spacing of a reference slot of the FR 2 is used, the number of PRACH slots within a reference slot exceeds 2. However, in an existing configuration table, the number of PRACH slots within a 60-kHz slot can only be 1 or 2, and cannot be used for a larger subcarrier spacing. Therefore, to follow RO time-domain resource configuration of the FR 2, a reference slot and a parameter set of corresponding RO time-domain configuration need to be redesigned to support a larger PRACH subcarrier spacing.

An embodiment of this application provides a random access occasion RO time-domain resource configuration method, performed by a terminal. As shown in FIG. 3, the method includes the following steps.

Step 101: Obtain a subcarrier spacing of a reference time unit determined according to a first rule.

Step 102: Determine, based on a first information set and the subcarrier spacing of the reference time unit, RO time-domain resource configuration information that is in each subframe and that is used for transmitting a random access preamble.

Parameters of the first information set are obtained in at least one of the following manners:

- parameters configured by second configuration signaling;
- obtained by extending the parameters configured by the second configuration signaling;
- parameters predefined by a protocol; and
- obtained by extending the parameters predefined by the protocol.

The second configuration signaling may be RRC signaling.

In embodiments of this application, a subcarrier spacing of a reference time unit determined according to a first rule is obtained, and then RO time-domain resource configuration information that is in each subframe and that is used for transmitting a random access preamble is determined based on a first information set and the subcarrier spacing of the reference time unit. In this way, existing RO time-domain resource configuration may be followed, so that a larger PRACH subcarrier spacing is supported.

In some embodiments, the first rule includes:

- the subcarrier spacing of the reference time unit is determined by a network-side device or the terminal based on a subcarrier spacing of a physical random access channel PRACH time unit configured by the network-side device.

In some embodiments, the subcarrier spacing of the reference time unit is 1/A of the subcarrier spacing of the PRACH time unit, A is equal to 1 or is an even number greater than 1, and A is predefined by a protocol or configured by signaling.

In some embodiments, A is only applied or configured in a frequency range and/or subcarrier spacing. The frequency range may be 52.6 GHz to 71 GHz.

In some embodiments, in a case that the subcarrier spacing of the reference time unit is determined by the network-side device, the obtaining a subcarrier spacing of a reference time unit includes:

- receiving first configuration signaling of the network-side device, where the first configuration signaling implicitly indicates or explicitly indicates the subcarrier spacing of the reference time unit determined by the network-side device. The first configuration signaling may be RRC signaling.

In some embodiments, the first information set includes at least one of the following:

- a time unit number of an RO based on a reference time unit;
- a time unit number of a PRACH within a reference time unit;
- a sequence number of a PRACH time unit within a reference time unit; and
- RO configuration information of a preset frequency range.

The preset frequency range may be a frequency range 2 or may be another frequency range, for example, a frequency range 1 or the like.

In some embodiments, the RO configuration information of the preset frequency range includes at least one of the following:

- a number of ROs included within a PRACH time unit;
- a starting symbol number of a first RO in time domain within each basic time unit including ROs; and
- a number of OFDM symbols occupied by an RO in time domain.

In some embodiments, the RO configuration information of the preset frequency range is predefined by a protocol or configured by signaling.

In some embodiments, the time unit number of an RO based on a reference time unit is determined based on at least one of a time unit number of an RO based on a basic time unit, a number s of basic time units included within a frame, a subcarrier spacing μ₁of a reference time unit, and a subcarrier spacing μ₂of a basic time unit, a value of s is predefined by a protocol or configured by signaling, and a value of μ₂is predefined by a protocol or configured by signaling. For example, the value of s is predefined by a protocol, and the value of μ₂is predefined by a protocol; or, the value of s is configured by signaling, and the value of μ₂is predefined by a protocol; or, the value of s is predefined by a protocol, and the value of μ₂is configured by signaling, or, the value of s is configured by signaling, and the value of μ₂is configured by signaling.

In some embodiments, the time unit number of an RO based on a reference time unit is obtained by performing periodic extension on a time unit number of an RO based on a basic time unit, a period is s, and a number of times of the periodic extension is

$\frac{μ_{1}}{μ_{2}} .$

In an example, a sequence number of a slot in which an RO based on a basic slot is located is {0, 1, . . . , k} (sequence numbers are not necessarily consecutive, are not necessarily sequential, and do not necessarily start from 0). The number of basic slots included within a frame is s. A subcarrier spacing of a reference slot is μ₁. A subcarrier spacing of a basic slot is μ₂. A rule of the sequence number of a slot in which an RO based on a basic slot is located may be followed to number a slot in which an RO based on a reference slot is located in an extended manner, to obtain that a sequence number of the slot in which an RO based on a reference slot is located is

${0, 1, \dots, k} + s \times {0, 1, \dots, \frac{μ_{1}}{μ_{2}} - 1} .$

In some embodiments, in a case that N=1, only one PRACH time unit exists within a reference time unit, and a sequence number of a PRACH time unit within a reference time unit may be

$n_{slot}^{RA} = 0.$

In a case that N>1, a sequence number

$n_{slot}^{RA}$

of a PRACH time unit within a reference time unit is determined based on at least one of a sequence number of a PRACH time unit within a basic time unit, a maximum number M of PRACH time units included within a basic time unit, and N, and a value of M is predefined by a protocol or configured by signaling.

In some embodiments, in a case that N>1, the sequence number of a time unit of a PRACH within a reference time unit is obtained by performing periodic extension on the sequence number of a time unit of a PRACH within a basic time unit, a period is M, and a number of times of the periodic extension is

$\frac{N}{M} .$

In an example, in a case that N>1, a sequence number of a slot of a PRACH within a basic slot is {0, 1, . . . , Q} (sequence numbers are not necessarily consecutive, are not necessarily sequential, and do not necessarily start from 0). The maximum number of PRACH slots that may be included within a basic slot is M (M is 2 in an existing protocol). A rule of the sequence number of a slot of a PRACH within a basic slot may be followed to number PRACH slots within a reference slot in an extended manner, to obtain a sequence number

$n_{slot}^{R A} = {0, 1, \dots, Q} + M \times {0, 1, \dots, \frac{N}{M} - 1}$

of a slot of a PRACH within a reference slot.

In some embodiments, the time unit is a slot. For example, one time unit is one slot or a plurality of slots. The time unit may be an RO configuration period. For example, one time unit is one RO configuration period or a plurality of RO configuration periods.

In an embodiment, for example, the time unit is a slot. It is assumed that the design of the FR 2 is followed. As shown in Table 5, in a case that the indicated PRACH Configuration Index is equal to 74, in this configuration, UE can transmit a preamble in a format A3 in only system frames that satisfy n_SFN%1=0 (that is, all system frames).

In addition, a PRACH subcarrier spacing supported by the FR 2 is {60 kHz, 120 kHz}. It is assumed that a PRACH subcarrier spacing used in the FR 2 is 120 kHz.

TABLE 5

Random access configurations for an FR 2 and an unpaired spectrum

N_t^RA,slot,

number of

time-

Number of
domain

PRACH
PRACH

slots
occasions

PRACH

within a
within a
N_dur^RA,

Config.
Preamble
n_SFNmod x = y
Subframe
Starting
60-kHz
PRACH
PRACH

Index
format
x
y
number
symbol
slot
slot
duration

74
A3
1
0
9, 19, 29,
7
2
1
6

39

In a case that candidate PRACH subcarrier spacings may be respectively 120 kHz, 480 kHz, and 960 kHz, N=2, and a subcarrier spacing of a reference slot is ½ of a subcarrier spacing of a PRACH slot, corresponding subcarrier spacings μ₁of a reference slot are respectively 60 kHz, 240 kHz, and 480 kHz.

In this embodiment, the first information set includes:

- 1. A sequence number of a slot in which an RO based on a reference slot is located:

The sequence number {9, 19, 29, 39} of a slot in which an RO based on a basic slot is located in the FR 2 is followed. Slots that are based on a reference slot and that can be used for transmitting the preamble are numbered in an extended manner to obtain the sequence number of the slot in which an RO based on a reference slot is located:

${9, 19, 29, 39} + 40 \times {0, 1, \dots, \frac{μ_{1}}{μ_{2}} - 1} .$

In a case that a PRACH subcarrier spacing is 120 kHz, a corresponding subcarrier spacing μ₁of a reference slot is 60 kHz, and sequence numbers of slots that can be used for transmitting a preamble are {9, 19, 29, 39}.

In a case that a PRACH subcarrier spacing is 480 kHz, a corresponding subcarrier spacing μ₁of a reference slot is 240 kHz, and sequence numbers of slots that can be used for transmitting a preamble are {9, 19, 29, 39, 49, 59, 69, 79, . . . , 129, 139, 149, 159}, that is,

${9, 1 9, 2 9, 3 9} + 40 \times {0, 1, \dots, \frac{240}{60} - 1} = {9, 19, 2 9, 3 9} + 40 \times {0, 1, 2, 3} .$

In a case that a PRACH subcarrier spacing is 960 kHz, a corresponding subcarrier spacing μ₁of a reference slot is 480 kHz, and sequence numbers of slots that can be used for transmitting a preamble are {9, 19, 29, 39, 49, 59, 69, 79, . . . , 289, 299, 309, 319}, that is,

${9, 1 9, 2 9, 3 9} + 40 \times {0, 1, \dots, \frac{480}{60} - 1} = {9, 19, 2 9, 3 9} + 4 0 \times {0, 1, 2, 3, 4, 5, 6, 7} .$

- 2. A slot number N of PRACH slots included within a reference slot is equal to 4.
- 3. A sequence number of a slot of a PRACH within a reference slot. N>1. In the first information set, a sequence number of a slot of a PRACH within a basic slot is {0,1}. The maximum number of PRACH slots that may be included within a basic slot is 2. A rule of the sequence number of a slot of a PRACH within a basic slot of the FR 2 may be followed to number PRACH slots within a reference slot in an extended manner, to obtain a sequence number of a slot of a PRACH within a reference slot:

$n_{slot}^{RA} = {0, 1} + 2 \times {0, 1, \dots, \frac{2}{2} - 1} = {0, 1} .$

- 4. The number of ROs included within a PRACH slot in the first information set is in a one-to-one correspondence with the number of ROs included within a PRACH slot defined in the FR 2, and has a value of 1.
- 5. A starting symbol number of a first RO in time domain within each basic slot including ROs in the first information set is in a one-to-one correspondence with a starting symbol number of a first RO in time domain within each basic slot including ROs defined in the FR 2, and has a value of 7.
- 6. An OFDM symbol occupied by an RO in time domain in the first information set is in a one-to-one correspondence with an OFDM symbol occupied by an RO in time domain defined in the FR 2, and has a value of 6.

A formula of calculating a position of a starting OFDM symbol of each RO included within a PRACH slot within a reference slot is

$1 = 1_{0} + n_{t}^{RA} N_{dur}^{RA} + 14 n_{slot}^{R A} = 7 + 0 \times 6 + 14 \times {0, 1} = {7, 21} .$

Through the foregoing calculation, RO time-domain resource configuration for transmitting a preamble in each subframe may be obtained based on first information, as shown in FIG. 4 to FIG. 6.

In another embodiment, the design of the FR 2 in the foregoing embodiment is still used. In a case that PRACH subcarrier spacings may be respectively 120 kHz, 480 kHz, and 960 kHz, N=1, and a subcarrier spacing of a reference slot is a subcarrier spacing of a PRACH slot, corresponding subcarrier spacings μ₁of a reference slot are respectively 120 kHz, 480 kHz, and 960 kHz.

In this embodiment, the first information set includes:

- 1. A sequence number of a slot in which an RO based on a reference slot is located.

${9, 1 9, 2 9, 3 9} + 4 0 \times {0, 1, \dots, \frac{μ_{1}}{μ_{2}} - 1} .$

In a case that a PRACH subcarrier spacing is 120 kHz, a corresponding subcarrier spacing μ₁of a reference slot is 120 kHz, and sequence numbers of slots that can be used for transmitting a preamble are {9, 19, 29, 39, 49, 59, 69, 79}, that is,

${9, 1 9, 2 9, 3 9} + 40 \times {0, 1, \dots, \frac{120}{60} - 1} .$

In a case that a PRACH subcarrier spacing is 480 kHz, a corresponding subcarrier spacing μ₁of a reference slot is 480 kHz, and sequence numbers of slots that can be used for transmitting a preamble are {9, 19, 29, 39, 49, 59, 69, 79, . . . , 289, 299, 309, 319}, that is,

${9, 19, 29, 3 9}, ⁠ + 40 \times {0, 1, \dots, \frac{4 8 0}{6 0} - 1} = {9, 19, 2 9, 3 9} + 4 0 \times {0, 1, 2, 3, 4, 5, 6, 7}$

In a case that a PRACH subcarrier spacing is 960 kHz, a corresponding subcarrier spacing μ₁of a reference slot is 960 kHz, and sequence numbers of slots that can be used for transmitting a preamble are {9, 19, 29, 39, 49, 59, 69, 79, . . . , 609, 619, 629, 639}, that is,

${9, 19, 29, 39} + 40 \times {0, 1, \dots, \frac{960}{6 0} - 1} = {9, 19, 2 9, 3 9} + 4 0 \times {0, 1, 2, 3, \dots, 13, 14, 15} .$

- 2. A slot number N of PRACH slots included within a reference slot is equal to 1.
- 3. A sequence number of a slot of a PRACH within a reference slot:

N=1, and a sequence number of a slot of a PRACH within a reference slot is

$n_{slot}^{R A} = 0 .$

- 4. The number of ROs included within a PRACH slot in the first information set is in a one-to-one correspondence with the number of ROs included within a PRACH slot defined in the FR 2, and has a value of 1.
- 5. A starting symbol number of a first RO in time domain within each basic slot including ROs in the first information set is in a one-to-one correspondence with a starting symbol number of a first RO in time domain within each basic slot including ROs defined in the FR 2, and has a value of 7.
- 6. An OFDM symbol occupied by an RO in time domain in the first information set is in a one-to-one correspondence with an OFDM symbol occupied by an RO in time domain defined in the FR 2, and has a value of 6.

A position of a starting OFDM symbol of each RO included within a PRACH slot within a reference slot is:

$1 = 1_{0} + n_{t}^{RA} N_{dur}^{RA} + 14 n_{slot}^{R A} = 7 + 0 \times 6 + 14 \times 0 = {7} .$

Through the foregoing calculation, RO time-domain resource configuration for transmitting a preamble in each subframe set may be obtained based on the first information set, as shown in FIG. 7 to FIG. 9.

It should be noted that the RO time-domain resource configuration method provided in embodiments of this application may be performed by an RO time-domain resource configuration apparatus or modules in the RO time-domain resource configuration apparatus that are configured to perform and load the RO time-domain resource configuration method. In embodiments of this application, an example in which the RO time-domain resource configuration apparatus performs and loads the RO time-domain resource configuration method is used to describe the RO time-domain resource configuration method provided in embodiments of this application.

An embodiment of this application provides an RO time-domain resource configuration apparatus, applied to a terminal 300. As shown in FIG. 10, the apparatus includes:

- an obtaining module 310, configured to obtain a subcarrier spacing of a reference time unit determined according to a first rule; and
- a processing module 320, configured to determine, based on a first information set and the subcarrier spacing of the reference time unit, RO time-domain resource configuration information that is in each subframe and that is used for transmitting a random access preamble, where
- parameters of the first information set are obtained in at least one of the following manners:
- parameters configured by second configuration signaling;
- obtained by extending the parameters configured by the second configuration signaling;
- parameters predefined by a protocol; and
- obtained by extending the parameters predefined by the protocol.

The second configuration signaling may be RRC signaling.

In some embodiments, the first rule includes:

- the subcarrier spacing of the reference time unit is determined by a network-side device or the terminal based on a subcarrier spacing of a physical random access channel PRACH time unit configured by the network-side device.

In some embodiments, A is only applied or configured in a frequency range and/or subcarrier spacing. The frequency range may be 52.6 GHz to 71 GHz. In some embodiments, in a case that the subcarrier spacing of the reference time unit is determined by the network-side device, the obtaining module is configured to receive first configuration signaling of the network-side device, where the first configuration signaling implicitly indicates or explicitly indicates the subcarrier spacing of the reference time unit determined by the network-side device. The first configuration signaling may be RRC signaling.

In some embodiments, the first information set includes at least one of the following:

- a time unit number of an RO based on a reference time unit;
- a time unit number of a PRACH within a reference time unit;
- a sequence number of a PRACH time unit within a reference time unit; and
- RO configuration information of a preset frequency range.

In some embodiments, the RO configuration information of the preset frequency range includes at least one of the following:

- a number of ROs included within a PRACH time unit;
- a starting symbol number of a first RO in time domain within each basic time unit including ROs; and
- a number of OFDM symbols occupied by an RO in time domain.

In some embodiments, the RO configuration information of the preset frequency range is predefined by a protocol or configured by signaling.

$\frac{μ_{1}}{μ_{2}} .$

In some embodiments, in a case that N=1, a sequence number

$n_{slot}^{R A}$

of a PRACH time unit within a reference time unit is equal to 0.

In a case that N>1, a sequence number

$n_{slot}^{R A}$

of a PRACH time unit within a reference time unit is determined based on at least one of a sequence number of a PRACH time unit within a basic time unit, a maximum number M of PRACH time units included within a basic time unit, and N, and a value of M is predefined by a protocol or configured by signaling.

$\frac{N}{M} .$

In some embodiments, the time unit is a slot.

The RO time-domain resource configuration apparatus in embodiments of this application may be an apparatus or may be a part, an integrated circuit or a chip in a terminal. The apparatus may be a mobile electronic device or may be a non-mobile electronic device. For example, the mobile electronic device may be a mobile phone, a tablet computer, a notebook computer, a palmtop computer, an in-vehicle electronic device, a wearable device, an Ultra-Mobile Personal Computer (UMPC), a netbook, a Personal Digital Assistant (PDA), or the like. The non-mobile electronic device may be a Network Attached Storage (NAS), a Personal Computer (PC), a Television (TV), a teller machine, a kiosk, or the like. This is not specifically limited to embodiments of this application.

The RO time-domain resource configuration apparatus in embodiments of this application may be an apparatus with an operating system. The operating system may be an Android operating system, may be an iOS operating system, or may be another possible operating system. This is not specifically limited to the embodiments of this application.

For example, an embodiment of this application further provides an electronic device, including a processor, a memory, and a program or instructions stored in the memory and runnable on the processor. The program or instructions, when being executed by the processor, implement each process in the embodiments of the foregoing RO time-domain resource configuration method, and the same technical effect can be achieved. To avoid repetition, details are described again.

It should be noted that the electronic device in embodiments of this application includes the foregoing mobile electronic device or non-mobile electronic device.

The electronic device in this embodiment may be a terminal. FIG. 11 is a schematic diagram of a hardware structure of a terminal according to various embodiment of the present application. The terminal 50 includes, but is not limited to, components such as a radio frequency unit 51, a network module 52, an audio output unit 53, an input unit 54, a sensor 55, a display unit 56, a user input unit 57, an interface unit 58, a memory 59, a processor 510, and a power supply 511. A person skilled in the art may understand that the terminal structure shown in FIG. 11 does not constitute a limitation on the terminal, and the terminal may include more or fewer components than shown, or combine some components, or have different component arrangements. In the embodiments of this application, the terminal includes, but is not limited to, a mobile phone, a tablet computer, a notebook computer, a handheld computer, an in-vehicle terminal, a wearable device, a pedometer, and the like.

It should be understood that, in this embodiment of this application, the radio frequency unit 51 may be configured to send and receive a signal during an information receiving and sending process or a call process. For example, the radio frequency unit receives downlink data from a base station, then delivers the downlink information to the processor 510 for processing, and sends related uplink data to the base station. Generally, the radio frequency unit 51 includes, but is not limited to, an antenna, at least one amplifier, a transceiver, a coupler, a low noise amplifier, a duplexer, and the like. In addition, the radio frequency unit 51 may further communicate with the network and another device through wireless communication system.

The memory 59 may be configured to store a software program and various data. The memory 59 may mainly include a program storage area and a data storage area. The program storage area may store an operating system, an application program required by at least one function (for example, a sound playback function and an image display function), and the like. The data storage area may store data (for example, audio data and an address book) created according to the use of the mobile phone, and the like. In addition, the memory 59 may include a high-speed random access memory, and may also include a nonvolatile memory, for example, at least one magnetic disk storage device, a flash memory, or another volatile solid-state storage device.

The processor 510 is a control center of the terminal, and connects to various parts of the terminal by using various interfaces and lines. By running or executing the software program and/or module stored in the memory 59, and invoking data stored in the memory 59, the processor performs various functions and data processing of the terminal, thereby performing overall monitoring on the terminal. The processor 510 may include one or at least two processing units. In some embodiments, the processor 510 may integrate an application processor and a modem processor. The application processor mainly processes an operating system, a user interface, an application program, and the like. The modem processor mainly processes wireless communication. It may be understood that, in some alternative embodiments, the modem processor may not be integrated in the processor 510.

The terminal 50 may further include the power supply 511 (such as a battery) for supplying power to the components. In some embodiments, the power supply 511 may be logically connected to the processor 510 by a power management system, thereby implementing functions such as charging, discharging, and power consumption management by using the power management system.

In addition, the terminal 50 includes some functional module that are not shown, which are not described herein in detail.

In some embodiments, the processor 510 is configured to: obtain a subcarrier spacing of a reference time unit determined according to a first rule is and the processor 510; and determine, based on a first information set and the subcarrier spacing of the reference time unit, RO time-domain resource configuration information that is in each subframe and that is used for transmitting a random access preamble.

- parameters of the first information set are obtained in at least one of the following manners:
- parameters configured by second configuration signaling;
- obtained by extending the parameters configured by the second configuration signaling;
- parameters predefined by a protocol; and
- obtained by extending the parameters predefined by the protocol.

In some embodiments, the first rule includes:

- the subcarrier spacing of the reference time unit is determined by a network-side device or the terminal based on a subcarrier spacing of a physical random access channel PRACH time unit configured by the network-side device.

In some embodiments, A is only applied or configured in a frequency range and/or subcarrier spacing.

In some embodiments, in a case that the subcarrier spacing of the reference time unit is determined by the network-side device, the obtaining a subcarrier spacing of a reference time unit includes:

- receiving first configuration signaling of the network-side device, where the first configuration signaling implicitly indicates or explicitly indicates the subcarrier spacing of the reference time unit determined by the network-side device.

In some embodiments, the first information set includes at least one of the following:

- a time unit number of an RO based on a reference time unit;
- a time unit number of a PRACH within a reference time unit;
- a sequence number of a PRACH time unit within a reference time unit; and
- RO configuration information of a preset frequency range.

The preset frequency range may be a frequency range 2 or may be another frequency range, for example, a frequency range 1 or the like.

In some embodiments, the RO configuration information of the preset frequency range includes at least one of the following: