Method and device for transmitting and receiving data in mobile communication system
The present specification relates to a communication method and a communication device, and a random access method of a user equipment (UE), according to one embodiment of the present specification, comprises the steps of: sensing a random access trigger in a connected state; determining the type of the random access trigger when the random access trigger is sensed; and performing congestion control if the type of the random access trigger is a preset type.
1. A method by a terminal in a wireless communication, the method comprising:
communicating with a first base station based on a first packet data convergence protocol sequence number (PDCP SN) size for a first radio bearer, the first radio bearer being configured based on first configuration information;
receiving, from the first base station, a control message for a handover from the first base station to a second base station, wherein the control message includes an indication to perform full configuration and second configuration information, the second configuration information including information on a second PDCP SN size for a second radio bearer;
releasing the first radio bearer based on the indication to perform full configuration;
establishing the second radio bearer for communicating with the second base station, based on the second configuration information; and
communicating with the second base station based on the second PDCP SN size for the second radio bearer.
2. The method of claim 1 , wherein a first PDCP entity for the first radio bearer is released based on the full configuration and a second PDCP entity for the second radio bearer is established based on the second configuration information included in the control message.
3. The method of claim 2 , further comprising:
delivering a downlink PDCP packet stored in the first PDCP entity for a reception to an upper layer before the first PDCP entity is released.
4. The method of claim 2 , further comprising:
discarding an uplink PDCP packet stored in the first PDCP entity for a transmission before the first PDCP entity is released.
5. The method of claim 2 , further comprising:
delivering a downlink RLC packet stored in a first RLC entity to an upper layer before the first RLC entity is released.
6. The method of claim 2 , further comprising:
forwarding an uplink PDCP packet to the second PDCP entity,
wherein the uplink PDCP packet includes a first group of PDCP packets that has not been forwarded to a lower layer and a second group of PDCP packets that has been forwarded to the lower layer but successful delivery has not been confirmed.
7. A terminal in a wireless communication, the terminal comprising:
a transceiver; and
at least one processor configured to:
control the transceiver to communicate with a first base station based on a first packet data convergence protocol sequence number (PDCP SN) size for a first radio bearer, the first radio bearer being configured based on first configuration information;
control the transceiver to receive, from the first base station, a control message for a handover from the first base station to a second base station, wherein the control message includes an indication to perform full configuration and second configuration information, the second configuration information including information on a second PDCP SN size for a second radio bearer;
release the first radio bearer based on the indication to perform full configuration;
establish the second radio bearer for communicating with the second base station, based on the second configuration information; and
control the transceiver to communicate with the second base station based on the second PDCP SN size for the second radio bearer.
8. The terminal of claim 7 , wherein a first PDCP entity for the first radio bearer is released based on the full configuration and a second PDCP entity for the second radio bearer is established based on the second configuration information included in the control message.
9. The terminal of claim 8 , wherein the at least one processor is further configured to deliver a downlink PDCP packet stored in the first PDCP entity for a reception to an upper layer before the first PDCP entity is released.
10. The terminal of claim 8 , wherein the at least one processor is further configured to discard an uplink PDCP packet stored in the first PDCP entity for a transmission before the first PDCP entity is released.
11. The terminal of claim 8 , wherein the at least one processor is further configured to deliver a downlink RLC packet stored in a first RLC entity to an upper layer before the first RLC entity is released.
12. The terminal of claim 8 , wherein the at least one processor is further configured to forward an uplink PDCP packet to the second PDCP entity,
wherein the uplink PDCP packet includes a first group of PDCP packets that has not been forwarded to a lower layer and a second group of PDCP packets that has been forwarded to the lower layer but successful delivery has not been confirmed.