Method for offloading traffic by means of wireless LAN in mobile communications system and apparatus therefor
The present invention relates to a method for offloading traffic by means of wireless LAN in a mobile communications system and apparatus therefor, and more particularly to a method for a terminal to offload traffic at a bearer level, and to a base station communicating with the terminal. The method for a terminal to offload traffic according to the present invention includes the steps of: while performing a data communication with a base station through a bearer of a first communications network, receiving from the base station an offloading command for offloading a part of traffic to a second communications network; transmitting a report of the offloading to the base station in response to the offloading command; and performing a data communication of the partial traffic with an accessible AP through a bearer of the second communications network without releasing the bearer of the first communications network.
1. A method performed by a terminal in a wireless communication system supporting carrier aggregation (CA), the method comprising:
receiving, from a base station, a first message for requesting capability information of the terminal, wherein the first message includes a value indicating a type of a radio access technology (RAT);
reporting, to the base station, capability information based on the value;
receiving, from the base station, a second message of radio resource control (RRC) reconfiguration for adding or releasing a secondary cell; and
performing an RRC reconfiguration procedure based on the second message,
wherein an interruption of up to an interruption duration is allowed for the terminal on a serving cell during the RRC reconfiguration procedure, in case that the serving cell is in the same band as the secondary cell being added or released, and
wherein the interruption duration is determined based on a measurement duration.
2. The method of claim 1 , wherein the capability information includes band combination for the CA.
3. A terminal in a wireless communication system supporting carrier aggregation (CA), the terminal comprising:
a transmission/reception unit; and
a control unit coupled with the transmission/reception unit and configured to:
receive, from a base station, a first message for requesting capability information of the terminal, wherein the first message includes a value indicating a type of a radio access technology (RAT),
report, to the base station, capability information based on the value,
receive, from the base station, a second message of radio resource control (RRC) reconfiguration for adding or releasing a secondary cell, and
perform an RRC reconfiguration procedure based on the second message,
wherein an interruption of up to an interruption duration is allowed for the terminal on a serving cell during the RRC reconfiguration procedure, in case that the serving cell is in the same band as the secondary cell being added or released, and
wherein the interruption duration is determined based on a measurement duration.
4. The terminal of claim 3 , wherein the capability information includes band combination for the CA.
5. A method performed by a base station in a wireless communication system supporting carrier aggregation (CA), the method comprising:
transmitting, to a terminal, a first message for requesting capability information of the terminal, wherein the first message includes a value indicating a type of a radio access technology (RAT);
receiving, from the terminal, capability information based on the value;
transmitting, to the terminal, a second message of radio resource control (RRC) reconfiguration for adding or releasing a secondary cell; and
performing an RRC reconfiguration procedure based on the second message,
wherein an interruption of up to an interruption duration is allowed for the terminal on a serving cell during the RRC reconfiguration procedure, in case that the serving cell is in the same band as the secondary cell being added or released, and
wherein the interruption duration is determined based on a measurement duration.
6. The method of claim 5 , wherein the capability information includes band combination for the CA.
7. A base station in a wireless communication system supporting carrier aggregation (CA), the base station comprising:
a transmission/reception unit; and
a control unit coupled with the transmission/reception unit and configured to:
transmit, to a terminal, a first message for requesting capability information of the terminal, wherein the first message includes a value indicating a type of a radio access technology (RAT),
receive, from the terminal, capability information based on the value,
transmit, to the base station, a second message of radio resource control (RRC) reconfiguration for adding or releasing a secondary cell, and
perform an RRC reconfiguration procedure based on the second message,
wherein an interruption of up to an interruption duration is allowed for the terminal on a serving cell during the RRC reconfiguration procedure, in case that the serving cell is in the same band as the secondary cell being added or released, and
wherein the interruption duration is determined based on a measurement duration.
8. The base station of claim 7 , wherein the capability information includes band combination for the CA.
9. The method of claim 1 , wherein the capability information includes a value indicating a type of the RAT.
10. The method of claim 1 , wherein the measurement duration is associated with adding or releasing the secondary cell.
11. The terminal of claim 3 , wherein the capability information includes a value indicating a type of the RAT.
12. The terminal of claim 3 , wherein the measurement duration is associated with adding or releasing the secondary cell.
13. The method of claim 5 , wherein the capability information includes a value indicating a type of the RAT.
14. The method of claim 5 , wherein the measurement duration is associated with adding or releasing the secondary cell.
15. The base station of claim 7 , wherein the capability information includes a value indicating a type of the RAT.
16. The base station of claim 7 , wherein the measurement duration is associated with adding or releasing the secondary cell.