Methods and apparatus for transmitting RACH in wireless communication system
The present disclosure relates to a pre-5 th -Generation (5G) or 5G communication system to be provided for supporting higher data rates Beyond 4 th -Generation (4G) communication system such as Long Term Evolution (LTE). A method for operating a terminal in a wireless communication system includes receiving configuration information regarding a random access channel (RACH) from a base station, and transmitting a RACH preamble based on the configuration information. The configuration information includes information indicating the number of RACH transmission occasions in a frequency axis. A terminal includes a processor configured to receive configuration information regarding a RACH from a base station, and transmit a RACH preamble according to the configuration information, wherein the configuration information includes information indicating the number of RACH transmission occasions in a frequency axis.
1. A method performed by a terminal in a wireless communication system, the method comprising:
receiving, from a base station, a master information block (MIB) on a frequency range, wherein the frequency range is one of a first frequency range or a second frequency range;
receiving, from the base station, a system information block (SIB) based on the MIB, the SIB including first information indicating a number of physical random access channel (PRACH) transmission occasions in a frequency domain, second information indicating a preamble format of a PRACH, and third information indicating a subcarrier spacing (SCS) of the PRACH;
in case that the frequency range is the first frequency range, identifying a first preamble format corresponding to the first frequency range based on the second information and identifying a first SCS;
in case that the frequency range is the second frequency range, identifying a second preamble format corresponding to the second frequency range based on the second information and identifying a second SCS, wherein the second frequency range is different from the first frequency range and the second preamble format is different from the first preamble format; and
transmitting, to the base station, the PRACH based on the identified first preamble format and the identified first SCS or based on the identified second preamble format and the identified second SCS, and based on the first information and third information,
wherein the first SCS is one of 15 kHz or 30 kHz, and the second SCS is one of 60 kHz or 120 kHz.
2. The method of claim 1 ,
wherein the SIB includes PRACH frequency resources, and
wherein the PRACH frequency resources are numbered starting from a low frequency.
3. The method of claim 2 ,
wherein the PRACH is transmitted on a PRACH occasion associated with a synchronization signal block, SSB, among the PRACH transmission occasions, and
wherein an index of the PRACH occasion is used to determine a random access-radio network temporary identity (RA-RNTI).
4. The method of claim 1 , wherein transmitting the PRACH comprises transmitting the PRACH based on an association between a synchronization signal block (SSB) and a PRACH resource.
5. The method of claim 1 , wherein the second information further indicates a number of the PRACH transmission occasions in a time domain.
6. A terminal in a wireless communication system, the terminal comprising:
a transceiver; and
at least one processor coupled to the transceiver, the at least one processor configured to:
receive, from a base station, a master information block (MIB) on a frequency range, wherein the frequency range is one of a first frequency range or a second frequency range;
receive, from the base station, a system information block (SIB) based on the MIB, the SIB including first information indicating a number of physical random access channel (PRACH) transmission occasions in a frequency domain, second information indicating a preamble format of a PRACH, and third information indicating a subcarrier spacing (SCS) of the PRACH;
in case that the frequency range is the first frequency range, identify a first preamble format corresponding to the first frequency range based on the second information and identify a first SCS;
in case that the frequency range is the second frequency range, identify a second preamble format corresponding to the second frequency range based on the second information and identify a second SCS, wherein the second frequency range is different from the first frequency range and the second preamble format is different from the first preamble format; and
transmit, to the base station, the PRACH based on the identified first preamble format and the identified first SCS or based on the identified second preamble format and the identified second SCS, and based on the first information and third information,
wherein the first SCS is one of 15 kHz or 30 kHz, and
the second SCS is one of 60 kHz or 120 kHz.
7. The terminal of claim 6 , wherein the SIB includes a plurality of PRACH frequency resources, and
wherein the PRACH frequency resources are numbered starting from a low frequency.
8. The terminal of claim 7 ,
wherein the PRACH is transmitted on a PRACH occasion associated with a synchronization signal block, SSB, among the PRACH transmission occasions, and
wherein an index of the PRACH occasion is used to determine a random access-radio network temporary identity (RA-RNTI).
9. The terminal of claim 6 , wherein the at least one processor is further configured to transmit the PRACH based on an association between a synchronization signal block (SSB) and a PRACH resource.
10. The terminal of claim 6 , wherein the second information further indicates a number of the PRACH transmission occasions in a time domain.
11. A base station in a wireless communication system, the base station comprising:
a transceiver; and
at least one processor coupled to the transceiver and configured to:
transmit, to a terminal, a master information block (MIB) on a frequency range, wherein the frequency range is one of a first frequency range or a second frequency range;
transmit, to the terminal, a system information block (SIB) based on the MIB, the SIB including first information indicating a number of a physical random access channel (PRACH) transmission occasions in a frequency domain, second information indicating a preamble format of a PRACH, and third information indicating a subcarrier spacing (SCS) of the PRACH; and
receive, from the terminal, the PRACH based on the SIB,
wherein, in case that the frequency range is the first frequency range, a first preamble format corresponding to the first frequency range is identified based on the second information and
a first SCS is identified,
wherein, in case that the frequency range is the second frequency range, a second preamble format corresponding to the second frequency range is identified based on the second information and a second SCS is identified, wherein the second frequency range is different from the first frequency range and the second preamble format is different from the first preamble format,
wherein the first SCS is one of 15 kHz or 30 kHz, and
the second SCS is one of 60 kHz or 120 kHz.
12. The base station of claim 11 , wherein the SIB includes PRACH frequency resources, and
wherein the PRACH frequency resources are numbered starting from a low frequency.
13. The base station of claim 12 ,
wherein the PRACH is transmitted on a PRACH occasion associated with a synchronization signal block, SSB, among the PRACH transmission occasions, and
wherein an index of the PRACH occasion is used to determine a random access-radio network temporary identity (RA-RNTI).
14. The base station of claim 11 , wherein the second information further indicates a number of the PRACH transmission occasions in a time domain.