Method and apparatus for confirmation of random access resources

1 . A method performed by a user equipment (UE) in a wireless communication system, comprising:

receiving, from a base station, random access resource configuration information including information of a frequency domain gap between adjacent random access occasions (ROs);

determining a frequency domain location of a first RO;

determining frequency domain locations of other M−1 ROs based on the frequency domain location of the first RO and the frequency domain gap, wherein M is an integer greater than or equal to 2, gaps between the adjacent ROs among M ROs are the same as each other, and a frequency domain starting location of a subsequent RO adjacent to an RO among the M ROs is on a symmetry plane of a frequency domain reference location; and

transmitting a random access preamble based on the determined frequency domain locations of the M ROs.

2 . The method according to claim 1 , wherein determining the frequency domain location of the first RO comprises at least one of:

determining the frequency domain location of the first RO based on frequency domain location information of the first RO, wherein the frequency domain location information of the first RO is included in the random access resource configuration information; and

determining the frequency domain location of the first RO according to ROs mapped by a selected synchronization signal/PBCH block (SSB).

3 . The method according to claim 2 , wherein the first RO is a random one among ROs mapped by the selected SSB, or an earliest one available in time, or a random one at the same time, or one with the largest frequency domain unit index, or one with the smallest frequency domain unit index.

4 . The method according to claim 1 , wherein the determining the frequency domain locations of the other M−1 ROs based on the frequency domain location of the first RO comprises:

determining the frequency domain locations of the M−1 ROs based on the reference frequency domain location, according to the frequency domain location of the first RO,

wherein the reference frequency domain location is predetermined or included in the random access resource configuration information.

5 . The method according to claim 1 , wherein the random access resource configuration information further includes time domain configuration information, and the time domain configuration information includes at least one of:

a random access configuration index, used for indicating at least one of random access preamble format, random access configuration periodicity, a time unit index of random access over a time period, a number of ROs in a time unit, starting location of a time unit, and a number of occupied time units; and

a number of random access preambles N that can be sent in one random access attempt, where N is an integer greater than or equal to 1.

6 . The method according to claim 1 , wherein the determining the frequency domain locations of the M ROs comprises:

receiving random access resource configuration information; and

determining the frequency domain locations of the M ROs based on the random access resource configuration information,

wherein the random access resource configuration information includes at least one of:

frequency domain location information of each of the M ROs;

frequency domain location pattern information of the M ROs.

7 . The method according to claim 1 , further comprising:

transmitting a plurality of random access preambles or transmitting one random access preamble based on a measurement result of an SSB.

8 . The method according to claim 7 , wherein the transmitting the plurality of random access preambles or the transmitting the one random access preamble comprises:

sending a plurality of random access preambles or sending one random access preamble based on a result of comparison between the measurement result of the SSB and a first threshold; and

sending a plurality of random access preambles or sending one random access preamble based on a result of comparison between the measurement result of the SSB and a plurality of thresholds.

9 . The method according to claim 1 , further comprising:

performing power ramping according to a power ramping step size, in a case of retransmitting the random access preamble/channel,

wherein the power ramping step size is determined by at least one of:

a predefined power ramping step size;

a power ramping step size configured by the base station;

a power ramping step size corresponding to a threshold of a measurement result of an associated SSB; and

determining the power ramping step size according to a first power ramping step size and a step size gap value.

10 . A method performed by a base station in a wireless communication system, comprising:

transmitting random access resource configuration information including information of a frequency domain gap between adjacent random access occasions (ROs); and

receiving, from a user equipment (UE), a random access preamble based on the random access resource configuration information,

wherein the random access preamble is transmitted based on frequency domain locations of M ROs,

wherein the frequency domain locations of the M ROs include a frequency domain location of a first RO and the frequency domain locations of other M−1 ROs determined based on the frequency domain location of the first RO and the frequency domain gap,

wherein M is an integer greater than or equal to 2, and

wherein gaps between the adjacent ROs among the M ROs are the same as each other, and a frequency domain starting location of a subsequent RO adjacent to an RO among the M ROs is on a symmetry plane of a frequency domain reference location.

11 . The method according to claim 10 , wherein the random access resource configuration information includes information of frequency domain location of the first RO, and

wherein the frequency domain location of the first RO is determined based on the frequency domain location information of the first RO and/or ROs mapped by a synchronization signal/PBCH block (SSB).

12 . The method according to claim 11 , wherein the first RO is a random one among the ROs mapped by the SSB, or an earliest one available in time, or a random one at the same time, or one with the largest frequency domain unit index, or one with the smallest frequency domain unit index.

13 . The method according to claim 10 ,

wherein the random access resource configuration information includes information of frequency domain gap between adjacent ROs, and

wherein the frequency domain locations of the other M−1 ROs are determined based on the frequency domain gap, according to the frequency domain location of the first RO.

14 . The method according to claim 10 , wherein the frequency domain locations of the M−1 ROs are determined based on the reference frequency domain location, according to the frequency domain location of the first RO, and

wherein the reference frequency domain location is predefined or included in the random access resource configuration information.

15 . The method according to claim 10 , wherein the random access resource configuration information includes time domain configuration information, and the time domain configuration information includes at least one of:

a random access configuration index, used for indicating at least one of a random access preamble format, random access configuration periodicity, a time unit index of random access over a time period, a number of ROs in a time unit, starting location of a time unit, and a number of occupied time units; and

a number of random access preambles N that can be sent in one random access attempt, where N is an integer greater than or equal to 1.

16 . The method according to claim 10 , wherein the random access resource configuration information includes at least one of:

frequency domain location information of each of the M ROs; and

frequency domain location pattern information of the M ROs,

wherein the frequency domain locations of the M ROs are determined based on the random access resource configuration information.

17 . A user equipment (UE) in a wireless communication system, comprising:

a transceiver, and

a processor coupled to the transceiver and configured to:

receive, from a base station, random access resource configuration information including information of a frequency domain gap between adjacent random access occasions (ROs),

determine a frequency domain location of a first RO,

determine frequency domain locations of other M−1 ROs based on the frequency domain location of the first RO and the frequency domain gap, wherein M is an integer greater than or equal to 2, gaps between the adjacent ROs among M ROs are the same as each other, and a frequency domain starting location of a subsequent RO adjacent to an RO among the M ROs is on a symmetry plane of a frequency domain reference location, and

transmit a random access preamble based on the determined frequency domain locations of the M ROs.

18 . The UE according to claim 17 , wherein the processor is configured to:

determine the frequency domain location of the first RO based on frequency domain location information of the first RO, wherein the frequency domain location information of the first RO is included in random access resource configuration information sent by a base station, and

determine the frequency domain location of the first RO according to ROs mapped by a selected synchronization signal/PBCH block (SSB).

19 . A base station in a wireless communication system, comprising:

a transceiver, and

a processor coupled to the transceiver and configured to:

transmit random access resource configuration information including information of a frequency domain gap between adjacent random access occasions (ROs), and

receive, from a user equipment (UE), a random access preamble based on the random access resource configuration information,

wherein the random access preamble is transmitted based on frequency domain locations of M ROs,

wherein the frequency domain locations of the M ROs include a frequency domain location of a first RO and the frequency domain locations of other M−1 ROs determined based on the frequency domain location of the first RO and the frequency domain gap,

wherein M is an integer greater than or equal to 2, and

wherein gaps between the adjacent ROs among the M ROs are the same as each other, and a frequency domain starting location of a subsequent RO adjacent to an RO among the M ROs is on a symmetry plane of a frequency domain reference location.