Method for random access in wireless communication system and apparatus for the same

1. An operation method of a terminal in a communication system, the operation method comprising:

receiving system information including configuration information on a physical random access channel (PRACH) slot composed of a plurality of access slots from a first base station;

selecting one access slot among the plurality of access slots based on the configuration information; and

transmitting a random access preamble to the first base station through the one access slot,

wherein a radio frame comprises a plurality of subframes in the communication system, each of the plurality of subframes comprises one or more normal slots, and one or a plurality of PRACH slots for random access are allocated among the one or more normal slots in a subframe indicated by the configuration information,

wherein the plurality of access slots are used for transmission of random access preambles in the PRACH slot, and each of the plurality of access slots is overlapped in a time domain with at least one other access slot of the plurality of access slots, and

wherein the configuration information further includes information indicating starting positions of the plurality of access slots, a common duration which is commonly applied to each of the plurality of access slots or a duration which is individually applied to each of the plurality of access slots, and a number of the plurality of access slots in the PRACH slot.

2. The operation method according to claim 1 , further comprising:

receiving a random access response from the first base station in response to the random access preamble; and

transmitting a signaling message to the first base station by referring to the random access response.

3. The operation method according to claim 1 , wherein the configuration information includes, for each of at least one among an omni-directional beam, a sector beam, and a spot beam, a physical resource allocation information for the PRACH slot and information on configuration of a plurality of access slots within the PRACH slot.

4. The operation method according to claim 1 , wherein the configuration information further includes information indicating formats of the random access preambles transmitted through the plurality of access slots.

5. The operation method according to claim 1 , wherein the configuration information further includes offsets indicating differences between the starting positions of the plurality of access slots.

6. The operation method according to claim 5 , wherein an offset is allocated to be equal to or larger than a cyclic shift offset, the cyclic shift offset is a unit length of cyclic shifts of a preamble sequence applied to the random access preamble, and the cyclic shift offset is indicated by the configuration information.

7. The operation method according to claim 1 , wherein, when the first base station supports a plurality of beams, the configuration information on the PRACH slot further includes information indicating one or more access slots mapped to one or more of the plurality of beams.

8. The operation method according to claim 1 , wherein the configuration information on the PRACH slot is configured through coordination of the first base station and a second base station, and used commonly by the first base station and second base station.

9. An operation method of a first base station in a communication system, the operation method comprising:

generating system information including configuration information on a physical random access channel (PRACH) slot composed of a plurality of access slots;

transmitting the system information; and

receiving a random access preamble through each of the plurality of access slots from a terminal,

wherein a radio frame comprises a plurality of subframes in the communication system, each of the plurality of subframes comprises one or more normal slots, and one or a plurality of PRACH slots for random access are allocated among the one or more normal slots in a subframe indicated by the configuration information,

wherein the plurality of access slots in the PRACH slot are used for transmission of random access preambles and each of the plurality of access slots is overlapped in a time domain with at least one other access slot of the plurality of access slots, and

wherein the configuration information further includes information indicating starting positions of the plurality of access slots, a common duration which is commonly applied to each of the plurality of access slots or a duration which is individually applied to each of the plurality of access slots, and a number of the plurality of access slots in the PRACH slot.

10. The operation method according to claim 9 , wherein the configuration information includes, for each of at least one among an omni-directional beam, a sector beam, and a spot beam, a physical resource allocation information for a PRACH slot and information on configuration of a plurality of access slots within the PRACH slot.

11. The operation method according to claim 9 , wherein the configuration information further includes information indicating formats of the random access preambles transmitted through the plurality of access slots.

12. The operation method according to claim 9 , wherein the configuration information further includes offsets indicating differences between the starting positions of the plurality of access slots.

13. The operation method according to claim 9 , wherein the offset is allocated to be equal to or larger than a cyclic shift offset, the cyclic shift offset is a unit length of cyclic shifts of a preamble sequence applied to the random access preamble, and the cyclic shift offset is indicated by the configuration information.

14. The operation method according to claim 9 , wherein, when the first base station supports a plurality of beams, the configuration information on the PRACH slot further includes information indicating one or more access slots mapped to one or more of the plurality of beams.

15. An operation method of a terminal in a communication system, the operation method comprising:

receiving system information including configuration information on a physical random access channel (PRACH) slot composed of a plurality of access slots from a first base station;

selecting one access slot among the plurality of access slots based on the configuration information; and

transmitting a random access preamble to the first base station through the one access slot,

wherein a radio frame comprises a plurality of subframes in the communication system, each of the plurality of subframes comprises one or more normal slots, and one or a plurality of PRACH slots for random access are allocated among the one or more normal slots in a subframe indicated by the configuration information,

wherein the plurality of access slots are used for transmission of random access preambles in the PRACH slot, and the configuration information includes information indicating a starting point of a first access slot among the plurality of access slots, a number of the plurality of access slots, and a common duration which is commonly applied to each of the plurality of access slots or a duration which is individually applied to each of the plurality of access slots, and a number of the plurality of access slots in the PRACH slot.

16. The operation method according to claim 15 , wherein the configuration information further includes information indicating formats of the random access preambles transmitted through the plurality of access slots.

17. The operation method according to claim 15 , wherein starting positions of any two access slots of the plurality of access slots have an offset equal to or larger than a cyclic shift offset, which is a unit length of cyclic shifts used to generate the random access preambles, and the cyclic shift offset is indicated by the configuration information.

18. The operation method according to claim 15 , wherein the configuration information further includes a physical resource allocation information for the PRACH slot and information on configuration of the plurality of access slots within the PRACH slot.

19. The operation method according to claim 15 , wherein, when the first base station supports a plurality of beams, the configuration information on the PRACH slot further includes information indicating one or more access slots mapped to one or more of the plurality of beams.