Random access method and apparatus, terminal and storage medium

1 . A random access method, comprising:

determining, by a terminal, a random access occasion (RO) time domain position group; and

selecting a first RO from the RO time domain position group, and calculating a random access radio network temporary identifier (RA-RNTI) of the first RO,

wherein the RO time domain position group comprises at least one of the following:

a transmittable frame number group and a first slot number group, and

a second slot number group,

wherein the transmittable frame number group is used to indicate a transmittable frame, and the transmittable frame is a radio frame wherein an RO that is used to transmit a preamble is located;

the first slot number group is used to indicate a first slot that is based on a first subcarrier spacing and in which the RO is located in the transmittable frame; and

the second slot number group is used to indicate a second slot that is based on a second subcarrier spacing and in which the RO is located in the first slot,

wherein the determining, by the terminal, the random access occasion (RO) time domain position group comprises:

obtaining a random access channel (RACH) configuration table according to at least one of the frequency range for sending a physical random access channel (PRACH), the subcarrier spacing of the PRACH, and the frequency band characteristic for sending a PRACH;

searching the RACH configuration table according to a PRACH configuration index indicated by a network, to obtain the transmittable frame number group, the first slot number group, and a size M2 of the second slot number group in which the RO is located; and

determining that the second slot number group is M2 values predefined between 0 and N−1,

wherein N is a ratio of the second subcarrier spacing to the first subcarrier spacing; and

the M2 values of the second slot number group are one or more combinations of M2 values obtained from 0 to N−1.

2 . The random access method according to claim 1 , wherein the first subcarrier spacing or the second subcarrier spacing is related to at least one of the following:

a subcarrier spacing for sending a physical random access channel (PRACH);

a frequency range for sending a PRACH;

a format for sending a PRACH; or

a sequence length for sending a PRACH.

3 . The random access method according to claim 1 , wherein the first slot number group is related to at least one of the following:

a subcarrier spacing for sending a PRACH;

a frequency range for sending a PRACH;

a frequency band characteristic for sending a PRACH;

a format for sending a PRACH;

a sequence length for sending a PRACH;

a PRACH configuration index;

the first subcarrier spacing;

a number L of slots that are based on the first subcarrier spacing and that are contained in each radio frame;

a size M1 of the first slot number group; or

a configuration index of the first slot number group.

4 . The random access method according to claim 1 , wherein the second slot number group is related to at least one of the following:

a subcarrier spacing for sending a PRACH; or

a size M2 of the second slot number group.

5 . The random access method according to claim 1 , wherein that the M2 values of the second slot number group are one or more combinations of M2 values obtained from 0 to N−1 comprises one or more of the following: the first M2 values from 0 to N−1; the last M2 values from 0 to N−1; all or a part of X satisfying X mod (rounded up or rounded down value of N/M2)=Y, wherein X is an integer value between 0 and N−1, and Y is one or more predefined values; M2 consecutive values between 0 and N−1; or multiple M2 consecutive values between 0 and N−1.

6 . The random access method according to claim 1 , wherein the calculating the random access radio network temporary identifier (RA-RNTI) of the first RO comprises:

determining a time domain number corresponding to the first RO; and

calculating a RA-RNTI of the first RO based on the time domain number.

7 . The random access method according to claim 6 , wherein the time domain number is a third slot number based on a third subcarrier spacing, wherein the third subcarrier spacing is determined by one of the following:

when the subcarrier spacing of the PRACH belongs to a first set, the third subcarrier spacing is the subcarrier spacing of the PRACH; otherwise, the third subcarrier spacing is the fourth subcarrier spacing, wherein the fourth subcarrier spacing is a predefined subcarrier spacing.

8 . The random access method according to claim 6 , wherein the calculating the RA-RNTI of the first RO based on the time domain number comprises:

calculating the RA-RNTI of the first RO based on the time domain number by using one of the following formulas:

RA

⁢

‐

⁢

RNTI

=

1

+

s_id

+

14

×

t_id

+

1

⁢

4

×

X

×

f_id

+

1

⁢

4

×

X

×

8

×

ul_carrier

⁢

_id

formula

⁢

1

wherein X is obtained by the following method:

a size of a slot set in which an RO is sent within a frame

wherein s_id is a first OFDM symbol index of the first RO;

t_id is a time domain number corresponding to the first RO;

f_id is a frequency domain number corresponding to the first RO; and

ul_carrier_id is an uplink carrier used to transmit the preamble, 0 means a normal uplink carrier, and 1 means a supplementary uplink carrier.

9 . The random access method according to claim 8 , wherein the size of the slot set in which the RO is transmitted within a frame is the first slot set size multiplied by a second slot set size.

10 . The random access method according to claim 8 , further comprising:

determining, by the terminal according to a size of X, whether it is necessary to determine, based on a first indication of the network, a received random access response (RAR) scheduled by a physical downlink control channel (PDCCH), or determining, by the terminal, a size of the first indication according to a size of X.

11 . The random access method according to claim 10 , wherein the first indication comprises at least one of the following:

an ID of a group of the slot set in which the RO is sent within a frame;

an ID of a group of a slot set in which an RO is sent in a configurable frame in a RACH configuration table obtained according to at least one of the frequency range for sending a PRACH, the subcarrier spacing of the PRACH, and the frequency band characteristic for sending a PRACH; or

a rounded up value of (1+s_id+14×t_id+14×X×f_id+14×X×8×ul_carrier_id)/A.

12 . A terminal, comprising:

a memory storing a computer program; and

a processor coupled to the memory and configured to execute the computer program to perform operations comprising:

determining a random access occasion (RO) time domain position group; and

selecting a first RO from the RO time domain position group, and calculating a random access radio network temporary identifier (RA-RNTI) of the first RO,

wherein the RO time domain position group comprises at least one of the following:

a transmittable frame number group and a first slot number group, and

a second slot number group,

wherein the transmittable frame number group is used to indicate a transmittable frame, and the transmittable frame is a radio frame wherein an RO that is used to transmit a preamble is located;

the first slot number group is used to indicate a first slot that is based on a first subcarrier spacing and in which the RO is located in the transmittable frame; and

the second slot number group is used to indicate a second slot that is based on a second subcarrier spacing and in which the RO is located in the first slot,

wherein the determining the random access occasion (RO) time domain position group comprises:

obtaining a random access channel (RACH) configuration table according to at least one of the frequency range for sending a physical random access channel (PRACH), the subcarrier spacing of the PRACH, and the frequency band characteristic for sending a PRACH;

searching the RACH configuration table according to a PRACH configuration index indicated by a network, to obtain the transmittable frame number group, the first slot number group, and a size M2 of the second slot number group in which the RO is located; and

determining that the second slot number group is M2 values predefined between 0 and N−1,

wherein N is a ratio of the second subcarrier spacing to the first subcarrier spacing; and

the M2 values of the second slot number group are one or more combinations of M2 values obtained from 0 to N−1.

13 . The terminal according to claim 12 , wherein the second slot number group is related to at least one of the following:

a subcarrier spacing for sending a PRACH; or

a size M2 of the second slot number group.

14 . The terminal according to claim 12 , wherein the calculating the random access radio network temporary identifier (RA-RNTI) of the first RO comprises:

determining a time domain number corresponding to the first RO; and

calculating a RA-RNTI of the first RO based on the time domain number.

15 . The terminal according to claim 14 , wherein the time domain number is a third slot number based on a third subcarrier spacing, wherein the third subcarrier spacing is determined by one of the following:

when the subcarrier spacing of the PRACH belongs to a first set, the third subcarrier spacing is the subcarrier spacing of the PRACH; otherwise, the third subcarrier spacing is the fourth subcarrier spacing, wherein the fourth subcarrier spacing is a predefined subcarrier spacing.

16 . The terminal according to claim 14 , wherein the calculating the RA-RNTI of the first RO based on the time domain number comprises:

calculating the RA-RNTI of the first RO based on the time domain number by using one of the following formulas:

RA

⁢

‐

⁢

RNTI

=

1

+

s_id

+

14

×

t_id

+

1

⁢

4

×

X

×

f_id

+

1

⁢

4

×

X

×

8

×

ul_carrier

⁢

_id

formula

⁢

1

wherein X is obtained by the following method:

a size of a slot set in which an RO is sent within a frame

wherein s_id is a first OFDM symbol index of the first RO;

t_id is a time domain number corresponding to the first RO;

f_id is a frequency domain number corresponding to the first RO; and

ul_carrier_id is an uplink carrier used to transmit the preamble, 0 means a normal uplink carrier, and 1 means a supplementary uplink carrier.

17 . A non-transitory computer-readable storage medium, storing a computer program, wherein the computer program, when executed by a processor of a terminal, causes the processor to perform operations comprising:

determining a random access occasion (RO) time domain position group; and

selecting a first RO from the RO time domain position group, and calculating a random access radio network temporary identifier (RA-RNTI) of the first RO,

wherein the RO time domain position group comprises at least one of the following:

a transmittable frame number group and a first slot number group, and

a second slot number group,

wherein the transmittable frame number group is used to indicate a transmittable frame, and the transmittable frame is a radio frame wherein an RO that is used to transmit a preamble is located;

the first slot number group is used to indicate a first slot that is based on a first subcarrier spacing and in which the RO is located in the transmittable frame; and

the second slot number group is used to indicate a second slot that is based on a second subcarrier spacing and in which the RO is located in the first slot,

wherein the determining the random access occasion (RO) time domain position group comprises:

obtaining a random access channel (RACH) configuration table according to at least one of the frequency range for sending a physical random access channel (PRACH), the subcarrier spacing of the PRACH, and the frequency band characteristic for sending a PRACH;

searching the RACH configuration table according to a PRACH configuration index indicated by a network, to obtain the transmittable frame number group, the first slot number group, and a size M2 of the second slot number group in which the RO is located; and

determining that the second slot number group is M2 values predefined between 0 and N−1,

wherein N is a ratio of the second subcarrier spacing to the first subcarrier spacing; and

the M2 values of the second slot number group are one or more combinations of M2 values obtained from 0 to N−1.

18 . The random access method according to claim 7 , wherein

when the subcarrier spacing of the PRACH is 15 KHz, 30 KHz, or 120 KHz, the third subcarrier spacing is the subcarrier spacing of the PRACH; otherwise, the third subcarrier spacing is 120 KHz.

19 . The terminal according to claim 15 , wherein

when the subcarrier spacing of the PRACH is 15 KHz, 30 KHz, or 120 KHz, the third subcarrier spacing is the subcarrier spacing of the PRACH; otherwise, the third subcarrier spacing is 120 KHz.

20 . The terminal according to claim 12 , wherein the first slot number group is related to at least one of the following:

a subcarrier spacing for sending a PRACH;

a frequency range for sending a PRACH;

a frequency band characteristic for sending a PRACH;

a format for sending a PRACH;

a sequence length for sending a PRACH;

a PRACH configuration index;

the first subcarrier spacing;

a number L of slots that are based on the first subcarrier spacing and that are contained in each radio frame;

a size M1 of the first slot number group; or

a configuration index of the first slot number group.