Method and device for recovering connection failure to network in next generation mobile communication system
The disclosure relates to a communication method and system for converging a 5th-Generation (5G) communication system for supporting higher data rates beyond a 4th-Generation (4G) system with a technology for Internet of Things (IoT). The disclosure may be applied to intelligent services based on the 5G communication technology and the IoT-related technology, such as smart home, smart building, smart city, smart car, connected car, health care, digital education, smart retail, security and safety services. The disclosure relates to a method and a device for quickly recovering a connection to a network in a next-generation mobile communication system when the connection to the network fails.
1. A method by a terminal in a wireless communication system, the method comprising:
detecting a radio link failure for a master cell group (MCG); and
performing an operation related to transmission of a message associated with the radio link failure for the MCG,
wherein the performing the operation comprising:
starting a timer, and
transmitting, to the MCG via a secondary cell group (SCG), the message associated with the radio link failure for the MCG via a signaling radio bearer (SRB)1 or an SRB3,
wherein the SRB1 corresponds to a split SRB,
wherein, in case that the SRB1 is configured as the split SRB and a packet data convergence protocol (PDCP) duplication is not configured, a configuration for an uplink transmission is changed from a primary radio link control (RLC) entity associated with the MCG to a secondary RLC entity associated with the SCG, and
wherein, in case that the SRB1 is configured as the split SRB, the message associated with the radio link failure for the MCG is transmitted via the SRB1.
2. The method of claim 1 , further comprising:
stopping the timer in case that a response is received from the MCG.
3. The method of claim 1 , further comprising:
triggering a radio resource control (RRC) connection re-establishment procedure in case that the timer expires.
4. The method of claim 1 , further comprising:
triggering a radio resource control (RRC) connection re-establishment procedure in case that a radio link failure for the SCG is detected while an MCG transmission is suspended.
5. A method by a secondary cell group (SCG) in a wireless communication system, the method comprising:
receiving, from a terminal, a message associated with a radio link failure for a master cell group (MCG) via a signaling radio bearer (SRB)1 or an SRB3, in case that the radio link failure for the MCG is detected, wherein the SRB1 corresponds to a split SRB; and
transmitting, to the MCG, the message associated with the radio link failure for the MCG via the SRB1 or the SRB3,
wherein a timer is started by the terminal,
wherein, in case that the SRB1 is configured as the split SRB and a packet data convergence protocol (PDCP) duplication is not configured, a configuration for an uplink transmission is changed from a primary radio link control (RLC) entity associated with the MCG to a secondary RLC entity associated with the SCG, and
wherein, in case that the SRB1 is configured as the split SRB, the message associated with the radio link failure for the MCG is received via the SRB1.
6. The method of claim 5 , wherein the timer is stopped by the terminal in case that the terminal receives a response from the MCG.
7. The method of claim 5 , wherein a radio resource control (RRC) connection re-establishment procedure is triggered in case that the timer expires.
8. The method of claim 5 , wherein a radio resource control (RRC) connection re-establishment procedure is triggered in case that a radio link failure for the SCG is detected while an MCG transmission is suspended.
9. A terminal comprising:
a transceiver to transmit and receive at least one signal; and
at least one processor coupled to the transceiver, and configured to:
detect a radio link failure for a master cell group (MCG), and
perform an operation related to transmission of a message associated with the radio link failure for the MCG,
wherein the at least one processor is further configured to:
control a timer to start, and
control the transceiver to transmit, to the MCG via a secondary cell group (SCG), the message associated with the radio link failure for the MCG via a signaling radio bearer (SRB)1 or an SRB3,
wherein the SRB1 corresponds to a split SRB,
wherein, in case that the SRB1 is configured as the split SRB and a packet data convergence protocol (PDCP) duplication is not configured, a configuration for an uplink transmission is changed from a primary radio link control (RLC) entity associated with the MCG to a secondary RLC entity associated with the SCG, and
wherein, in case that the SRB1 is configured as the split SRB, the message associated with the radio link failure for the MCG is transmitted via the SRB1.
10. The terminal of claim 9 , wherein the at least one processor is further configured to stop the timer in case that a response is received from the MCG.
11. The terminal of claim 9 , wherein the at least one processor is further configured to trigger a radio resource control (RRC) connection re-establishment procedure in case that the timer expires.
12. The terminal of claim 9 , wherein the at least one processor is further configured to trigger a RRC connection re-establishment procedure in case that a radio link failure for the SCG is detected while an MCG transmission is suspended.
13. A secondary cell group (SCG) comprising:
a transceiver to transmit and receive at least one signal; and
at least one processor coupled to the transceiver, and configured to:
receive, from a terminal, a message associated with a radio link failure for a master cell group (MCG) via a signaling radio bearer (SRB)1 or an SRB3, in case that the radio link failure for the MCG is detected, wherein the SRB1 corresponds to a split SRB, and
transmit, to the MCG, the message associated with the radio link failure for the MCG via the SRB1 or the SRB3,
wherein a timer is started by the terminal,
wherein, in case that the SRB1 is configured as the split SRB and a packet data convergence protocol (PDCP) duplication is not configured, a configuration for an uplink transmission is changed from a primary radio link control (RLC) entity associated with the MCG to a secondary RLC entity associated with the SCG, and
wherein, in case that the SRB1 is configured as the split SRB, the message associated with the radio link failure for the MCG is received via the SRB1.
14. The SCG of claim 13 , wherein the timer is stopped by the terminal in case that the terminal receives a response from the MCG.
15. The SCG of claim 13 , wherein a radio resource control (RRC) connection re-establishment procedure is triggered in case that the timer expires.
16. The SCG of claim 13 , wherein a radio resource control (RRC) connection re-establishment procedure is triggered in case that a radio link failure for the SCG is detected while an MCG transmission is suspended.