Apparatus and method for performing random access
The present specification relates to an apparatus and method for performing random access. This specification discloses a method for performing random access by a terminal in a non-terrestrial network system, the method comprising the steps of: performing a search for a cell of a non-terrestrial network on the basis of a synchronization signal block transmitted from a non-terrestrial network node; after the search for the cell is completed, receiving, from the non-terrestrial network node, random access-related information about the cell of the non-terrestrial network; generating a random access preamble on the basis of a frequency resource area of a random access channel related to the cell of the non-terrestrial network; and transmitting the generated random access preamble to the non-terrestrial network node. Performance degradation can be reduced when random access is performed in a non-terrestrial network system.
1. A method for performing a random access based on a network slicing of a user equipment (UE), the method comprising:
receiving information on a random access resource and slicing-related information which sets a parameter related to a random access priority through system information or a radio resource control (RRC) message from a base station; and
performing a random access procedure for the base station based on the information on a random access resource and the slicing-related information,
wherein the parameter related to a random access priority is set slice set-specifically, and
wherein the parameter related to a random access priority includes a parameter for a random access backoff value and a parameter for a random access transmit power offset value.
2. The method of claim 1 , wherein a random access transmit power offset value of a network slice dedicated to Ultra Reliable and Low Latency Communications (URLLC) services is greater than a random access transmit power offset value of a network slice which is not dedicated to the URLLC services.
3. The method of claim 1 , wherein the information on the random access resource includes a msgl-FDM parameter and a msgl-FrequencyStart parameter, and
wherein the msgl-FDM parameter and the msgl-FrequencyStart parameter are set individually for each slice set.
4. The method of claim 1 , wherein when the UE performs a handover from a serving cell to a target cell, the random access procedure is performed on a contention-free basis.
5. The method of claim 4 , wherein a handover-related message of the base station includes at least part of the slicing-related information.
6. The method of claim 1 , wherein a handover-related message of the base station includes information on whether network slicing is applied.
7. A method for performing a random access based on a network slicing of a base station, the method comprising:
transmitting information on a random access resource and slicing-related information which sets a parameter related to a random access priority through system information or a radio resource control (RRC) message to a user equipment (UE); and
performing a random access procedure with the UE based on the information on a random access resource and the slicing-related information,
wherein the parameter related to a random access priority is set slice set-specifically, and
wherein the parameter related to a random access priority includes a parameter for a random access backoff value and a parameter for a random access transmit power offset value.
8. The method of claim 7 , wherein a random access transmit power offset value of a network slice dedicated to Ultra Reliable and Low Latency Communications (URLLC) services is greater than a random access transmit power offset value of a network slice which is not dedicated to the URLLC services.
9. The method of claim 7 , wherein the information on the random access resource includes a msgl-FDM parameter and a msgl-FrequencyStart parameter, and
wherein the msgl-FDM parameter and the msgl-FrequencyStart parameter are set individually for each slice set.
10. The method of claim 7 , wherein when the UE performs a handover from a serving cell to a target cell, the random access procedure is performed on a contention-free basis.
11. The method of claim 10 , wherein a handover-related message of the base station includes at least part of the slicing-related information.
12. The method of claim 10 , wherein the handover-related message of the base station includes information on whether network slicing is applied.
13. A user equipment (UE) performing a random access based on a network slicing, the UE comprising:
a transceiver receiving information on a random access resource and slicing-related information which sets a parameter related to a random access priority through system information or a radio resource control (RRC) message from a base station, and performing a random access procedure for the base station based on the information on a random access resource and the slicing-related information; and
a processor generating a random access preamble used for the random access procedure,
wherein the parameter related to a random access priority is set slice set-specifically, and
wherein the parameter related to a random access priority includes a parameter for a random access backoff value and a parameter for a random access transmit power offset value.
14. A base station performing a random access based on a network slicing, the base station comprising:
a transceiver transmitting information on a random access resource and slicing-related information which sets a parameter related to a random access priority through system information or a radio resource control (RRC) message to a user equipment (UE), and performing a random access procedure with the UE based on the information on a random access resource and the slicing-related information; and
a processor generating a random access response message used for the random access procedure,
wherein the parameter related to a random access priority is set slice set-specifically, and
wherein the parameter related to a random access priority includes a parameter for a random access backoff value and a parameter for a random access transmit power offset value.