Method and user equipment for transmitting random access channel signal, and method and base station for receiving random access channel signal
A user equipment in a wireless communication system receives RACH configuration information including preamble format information indicating a first format and transmits a RACH preamble with the first format. The RACH preamble with the first format includes a cyclic prefix (CP) part and a sequence part in a time domain. The RACH preamble with the first format satisfies: a CP length of the RACH preamble of the first format is N times a CP length N CP of an orthogonal frequency division multiplexing (OFDM) symbol, where N is the number of OFDM symbols used to transmit a RACH preamble and is greater than 1.
1. A method of transmitting a random access channel (RACH) preamble by a user equipment in a wireless communication system, the method comprising:
receiving information on a configuration including preamble format information indicating a first format for the RACH preamble; and
transmitting the RACH preamble in N orthogonal frequency division multiplexing (OFDM) symbols based on the first format for the RACH preamble,
wherein the first format for the RACH preamble includes only a cyclic prefix (CP) part and a sequence part in a time domain, and
wherein the first format for the RACH preamble satisfies:
a length of the CP part is equal to N*N CP , where N is greater than 1 and N CP is a CP length of an OFDM symbol, and
the length of the CP part plus a length of the sequence part is equal to a total length of the N OFDM symbols.
2. The method according to claim 1 ,
wherein the length of the CP part is N*144*T s and the length of the sequence part is N*2048*T s , where T s is a sampling time.
3. The method according to claim 2 ,
wherein 144*T s is equal to N CP and 2048*T s is equal to a length of a data part per OFDM symbol.
4. The method according to claim 1 ,
wherein N is 2, 4, or 6.
5. The method according to claim 1 ,
wherein the sequence part includes a preamble sequence with a sequence length of 139 N times.
6. The method according to claim 1 ,
wherein the information on the configuration further includes information on a slot used for a RACH,
wherein when the preamble format information indicates a combination of the first format and a second format, the user equipment transmits the RACH preamble with the first format in a RACH resource associated with a synchronization signal (SS) block detected by the user equipment among RACH resources of the slot if the associated RACH resource is not a last RACH resource of the slot in the time domain and transmits a RACH preamble with the second format in the associated RACH resource if the associated RACH resource is the last RACH resource of the slot, and
wherein the second format includes a guard time with no signal after a sequence part of the second format.
7. A user equipment for transmitting a random access channel (RACH) preamble in a wireless communication system, the user equipment comprising,
a transceiver, and
a processor configured to control the transceiver, the processor configured to:
control the transceiver to receive information on a configuration including preamble format information indicating a first format for the RACH preamble; and
control the transceiver to transmit the RACH preamble in N orthogonal frequency division multiplexing (OFDM) symbols based on the first format for the RACH preamble,
wherein the first format for the RACH preamble includes only a cyclic prefix (CP) part and a sequence part in a time domain, and
wherein the first format for the RACH preamble satisfies:
a length of the CP part is equal to N*N CP , where N is greater than 1 and N CP is a CP length of an OFDM symbol, and
the length of the CP part plus a length of the sequence part is equal to a total length of the N OFDM symbols.
8. The user equipment according to claim 7 ,
wherein the length of the CP part is N*144*T s and the length of the sequence part is N*2048*T s , where T s is a sampling time.
9. The user equipment according to claim 7 ,
wherein the information on the configuration further includes information on a slot used for a RACH,
wherein when the preamble format information indicates a combination of the first format and a second format, the processor controls the transceiver to transmit the RACH preamble with the first format in a RACH resource associated with a synchronization signal (SS) block detected by the user equipment among RACH resources of the slot if the associated RACH resource is not a last RACH resource of the slot in the time domain and controls the transceiver to transmit a RACH preamble with the second format in the associated RACH resource if the associated RACH resource is the last RACH resource of the slot, and
the second format includes a guard time with no signal after a sequence part of the second format.
10. A method of receiving a random access channel (RACH) preamble by a base station in a wireless communication system, the method comprising:
transmitting information on a configuration including preamble format information indicating a first format for the RACH preamble; and
detecting the RACH preamble in N orthogonal frequency division multiplexing (OFDM) symbols based on the first format for the RACH preamble,
wherein the first format for the RACH preamble includes only a cyclic prefix (CP) part and a sequence part in a time domain, and
wherein the first format for the RACH preamble satisfies:
a length of the CP part is equal to N*N CP , where N is greater than 1 and N CP is a CP length of an OFDM symbol, and
the length of the CP part plus a length of the sequence part is equal to a total length of the N OFDM symbols.
11. The method according to claim 10 ,
wherein the length of the CP part is N*144*T s and the length of the sequence part is N*2048*T s , where T s is a sampling time.
12. The method according to claim 10 ,
wherein the sequence part includes a preamble sequence with a sequence length of 139 N times.
13. A base station for receiving a random access channel (RACH) preamble in a wireless communication system, the base station comprising,
a transceiver, and
a processor configured to control the transceiver, the processor configured to:
control the transceiver to transmit information on a configuration including preamble format information indicating a first format for the RACH format; and
detect the RACH preamble in N orthogonal frequency division multiplexing (OFDM) symbols based on the first format for the RACH preamble,
wherein the first format for the RACH preamble includes only a cyclic prefix (CP) part and a sequence part in a time domain, and
wherein the first format for the RACH preamble satisfies:
a length of the CP part is equal to N*N CP , where N is greater than 1 and N CP is a CP length of an OFDM symbol, and
the length of the CP part plus a length of the sequence part is equal to a total length of the N OFDM symbols.
14. The base station according to claim 13 ,
wherein the length of the CP part is N*144*T s and the length of the sequence part is N*2048*T s , where T s is a sampling time.