Method and apparatus for initial access of terminal in wireless communication system
The present disclosure relates to a communication method and system for converging a 5th-Generation (5G) communication system for supporting higher data rates beyond a 4th-Generation (4G) system with a technology for Internet of Things (IoT). The present disclosure may be applied to intelligent services based on the 5G communication technology and the IoT-related technology, such as smart home, smart building, smart city, smart car, connected car, health care, digital education, smart retail, security and safety services. A method for a terminal may include: identifying a reference subcarrier spacing value; receiving random access channel (RACH) configuration information; determining a resource to be used for transmitting a random access preamble based on the RACH configuration information and the reference subcarrier spacing value; and transmitting the random access preamble using the determined resource.
1. A method performed by a terminal in a wireless communication system, the method comprising:
receiving system information including random access channel (RACH) configuration information;
identifying a reference subcarrier spacing based on a subcarrier spacing for a random access preamble;
identifying a symbol offset associated with a starting position of the random access preamble, based on the RACH configuration information;
determining a time resource for the random access preamble based on the symbol offset and the reference subcarrier spacing value; and
transmitting the random access preamble using the determined time resource.
2. The method of claim 1 , wherein:
determining the time resource comprises determining a slot to be used for transmitting the random access preamble,
the RACH configuration information includes a physical random access channel (PRACH) configuration index, and
the slot is determined based on a slot offset value indicated by the PRACH configuration index and the reference subcarrier spacing.
3. The method of claim 1 , wherein a random access-radio network temporary identifier (RA-RNTI) associated with the random access preamble is calculated based on a slot index determined based on the reference subcarrier spacing.
4. The method of claim 3 ,
wherein the RA-RNTI is calculated further based on a symbol index associated with the symbol offset.
5. The method of claim 1 , further comprising:
determining a frequency resource for the random access preamble based on the RACH configuration,
wherein the random access preamble is transmitted using the determined time resource and the determined frequency resource.
6. The method of claim 1 ,
wherein the symbol offset is based on the reference subcarrier spacing.
7. A method performed by a base station in a wireless communication system, the method comprising:
transmitting system information including random access channel (RACH) configuration information; and
receiving a random access preamble on a time resource,
wherein the time resource for the random access preamble is determined based on a symbol offset associated with a starting position of the random access preamble and a reference subcarrier spacing,
wherein the reference subcarrier spacing is identified based on a subcarrier spacing for the random access preamble, and
wherein the symbol offset is identified based on the RACH configuration information.
8. The method of claim 7 , wherein:
the determined time resource includes a slot used to receive the random access preamble,
the RACH configuration information includes a physical random access channel (PRACH) configuration index, and
the slot is determined based on a slot offset value indicated by the PRACH configuration index and the reference subcarrier spacing.
9. The method of claim 7 , wherein a random access-radio network temporary identifier (RA-RNTI) associated with the random access preamble is calculated based on a slot index determined based on the reference subcarrier spacing.
10. The method of claim 9 ,
wherein the RA-RNTI is calculated further based on a symbol index associated with the symbol offset.
11. The method of claim 7 ,
wherein the symbol offset is based on the reference subcarrier spacing.
12. A terminal in a wireless communication system, the terminal comprising:
a transceiver; and
a controller configured to:
control the transceiver to receive system information including random access channel (RACH) configuration information,
identify a reference subcarrier spacing based on a subcarrier spacing for a random access preamble,
identify a symbol offset associated with a starting position of the random access preamble, based on the RACH configuration information,
determine a time resource for the random access preamble based on the symbol offset and the reference subcarrier spacing, and
control the transceiver to transmit the random access preamble using the determined time resource.
13. The terminal of claim 12 , wherein:
the controller is configured to determine a slot to be used for transmitting the random access preamble,
the RACH configuration information includes a physical random access channel (PRACH) configuration index, and
the slot is determined based on a slot offset value indicated by the PRACH configuration index and the reference subcarrier spacing value.
14. The terminal of claim 12 , wherein a random access-radio network temporary identifier (RA-RNTI) associated with the random access preamble is calculated based on a slot index determined based on the reference subcarrier spacing.
15. A base station in a wireless communication system, the base station comprising:
a transceiver; and
a controller configured to:
control the transceiver to transmit system information including random access channel (RACH) configuration information, and
control the transceiver to receive a random access preamble on a time resource,
wherein the time resource for the random access preamble is determined based on a symbol offset associated with a starting position of the random access preamble and a reference subcarrier spacing,
wherein the reference subcarrier spacing is identified based on a subcarrier spacing for the random access preamble, and
wherein the symbol offset is identified based on the RACH configuration information.
16. The base station of claim 15 , wherein:
the determined time resource includes a slot used to receive the random access preamble, and
the RACH configuration information includes a physical random access channel (PRACH) configuration index, and
the slot is determined based on a slot offset value indicated by the PRACH configuration index and the reference subcarrier spacing.
17. The base station of claim 15 , wherein a random access-radio network temporary identifier (RA-RNTI) associated with the random access preamble is calculated based on a slot index determined based on the reference subcarrier spacing.