Method and apparatus for random-accessing in wireless communication system
The present invention relates to a method for performing a random access, more specially, to a method for a terminal performing a random access in a wireless communication system, and comprises a step of transmitting to a base station a random access preamble selected from either a first random access preamble group or a second random access preamble group, wherein the first and second random access preamble groups are discriminated depending one packet type to be transmitted by the terminal.
1. A method of performing a random access by a user equipment in a wireless communication system, the method comprising:
transmitting a random access preamble selected from either a first random access preamble group or a second random access preamble group to a base station,
wherein each of the first random access preamble group and the second random access preamble group is discriminated depending on a packet type to be transmitted by the user equipment,
wherein the first random access preamble group is associated with a first radio bearer for transmitting an instant message packet, and
wherein the second random access preamble group is associated with a second radio bearer for transmitting a packet other than the instant message packet.
2. The method of claim 1 , further comprising:
receiving information on associated relationship among the first random access preamble group, the second random access preamble group, a radio bearer and the packet type from the base station.
3. The method of claim 1 , further comprising:
selecting a random access preamble group for selecting the random access preamble depending on the packet type to be transmitted by the user equipment.
4. The method of claim 1 , wherein
if a RLC (radio link control) layer buffer and a PDCP (packet data convergence protocol) layer buffer are empty and a packet associated with the radio bearer to be transmitted by the user equipment is identified , or
if a priority of the radio bearer associated with the packet to be transmitted by the user equipment is higher than that of a radio bearer for a packet in the RLC layer buffer and the PDCP layer buffer,
the user equipment starts to perform the random access.
5. A method of performing a random access by a base station in a wireless communication system, the method comprising:
receiving a random access preamble from a user equipment,
wherein the random access preamble corresponds to either a first random access preamble group or a second random access preamble group,
wherein each of the first random access preamble group and the second random access preamble group is discriminated depending on a packet type to be transmitted by the user equipment,
wherein the first random access preamble group is associated with a first radio bearer for transmitting an instant message packet, and
wherein the second random access preamble group is associated with a second radio bearer for transmitting a packet other than the instant message packet.
6. The method of claim 5 , further comprising:
transmitting information on associated relationship among the first random access preamble group, the second random access preamble group, a radio bearer and the packet type to the user equipment.
7. The method of claim 5 , wherein a random access preamble group for selecting the random access preamble is selected depending on the packet type to be transmitted by the user equipment.
8. The method of claim 5 , wherein if a RLC (radio link control) layer buffer and a PDCP (packet data convergence protocol) layer buffer are empty and a packet associated with the radio bearer to be transmitted by the user equipment is identified, or
if a priority of the radio bearer associated with the packet to be transmitted by the user equipment is higher than that of a radio bearer for a packet in the RLC layer buffer and the PDCP layer buffer,
the random access preamble is received.
9. A user equipment in a wireless communication system, comprising:
a transceiver; and
a processor coupled to the transceiver and configured to:
transmit a random access preamble selected from either a first random access preamble group or a second random access preamble group to a base station,
wherein each of the first random access preamble group and the second random access preamble group is discriminated depending on a packet type to be transmitted by the user equipment,
wherein the first random access preamble group is associated with a first radio bearer for transmitting an instant message packet, and
wherein the second random access preamble group is associated with a second radio bearer for transmitting a packet other than the instant message packet.
10. A base station in a wireless communication system, comprising:
a transceiver; and
a processor operatively connected to the transceiver and configured to:
receiver a random access preamble from a user equipment,
wherein the random access preamble corresponds to either a first random access preamble group or a second random access preamble group,
wherein each of the first random access preamble group and the second random access preamble group is discriminated depending on a packet type to be transmitted by the user equipment,
wherein the first random access preamble group is associated with a first radio bearer for transmitting an instant message packet, and
wherein the second random access preamble group is associated with a second radio bearer for transmitting a packet other than the instant message packet.