Method and apparatus for deactivating and activating secondary base station in wireless communication system
The present disclosure relates to: a communication technique for merging IoT technology with a 5G communication system for supporting a data transmission rate higher than that of a 4G system; and a system therefor. The present disclosure relates to a method performed by a terminal in a wireless communication system, and may comprise the steps of: receiving a deactivation command regarding a secondary cell group (SCG) from a first base station related to a master cell group (MCG); performing measurement on at least one beam related to the SCG, in a deactivated state regarding the SCG; and performing a random access with a second base station related to the SCG, on the basis of a random access preamble related to a downlink beam, when beam failure is detected on the basis of the measurement.
1 . A method performed by a user equipment (UE) in a wireless communication system, the method comprising:
receiving, from a first base station associated with a master cell group (MCG), a first radio resource control (RRC) reconfiguration message including configuration information for configuring a secondary cell group (SCG) associated with a second base station;
receiving, from the first base station, a second RRC message for deactivating the SCG;
based on the second RRC message for deactivating the SCG, performing an SCG deactivation;
detecting a beam failure on a primary secondary cell (PSCell) of the SCG while the SCG is deactivated; and
transmitting, to the first base station, a beam failure recovery (BFR) media access control (MAC) control element (CE) for informing the detection of the beam failure on the PSCell of the SCG,
wherein the BFR MAC CE includes information on a candidate beam for the PSCell, and
wherein the UE keeps running a time alignment timer (TAT) of a primary timing advance group (PTAG) that the PSCell belongs to while the SCG is deactivated.
2 . The method of claim 1 , further comprising:
based on the reception of the second RRC message for deactivating the SCG, transmitting, to the first base station, a confirmation message confirming that the second RRC message is received.
3 . The method of claim 1 ,
wherein the configuration information includes counter information for detecting the beam failure, and
wherein the beam failure is detected, in case that a counter for beam failure instance indication is equal to or larger than the counter information.
4 . The method of claim 1 , wherein the configuration information includes at least one of first information associated with a timing advance (TA) or second information on beam failure recovery.
5 . A method performed by a first base station associated with a master cell group (MCG) in a wireless communication system, the method comprising:
transmitting, to a user equipment (UE), a first radio resource control (RRC) reconfiguration message including configuration information for configuring a secondary cell group (SCG) associated with a second base station;
transmitting, to the UE, a second RRC message for deactivating the SCG; and
receiving, from the UE, a beam failure recovery (BFR) media access control (MAC) control element (CE) for informing a detection of a beam failure on a primary secondary cell (PSCell) of the SCG, in case that the beam failure on (the PSCell) of a deactivated state of the SCG is detected, wherein the BFR MAC CE includes information on a candidate beam for the PSCell, and
wherein a time alignment timer (TAT) of a primary timing advance group (PTAG) that the PSCell belongs to is running while the SCG is deactivated.
6 . The method of claim 5 , further comprising:
receiving, from the UE, a confirmation message confirming that the second RRC message is received, as a response to the second RRC message for deactivating the SCG.
7 . The method of claim 5 ,
wherein the configuration information includes counter information for detecting the beam failure, and
wherein the beam failure is detected, in case that a counter for beam failure instance indication is equal to or larger than the counter information.
8 . The method of claim 5 , wherein the configuration information includes at least one of first information associated with a timing advance (TA) or second information on beam failure recovery.
9 . A user equipment (UE) in a wireless communication system, the UE comprising:
a transceiver; and
a controller coupled with the transceiver and configured to:
receive, from a first base station associated with a master cell group (MCG), a first radio resource control (RRC) reconfiguration message including configuration information for configuring a secondary cell group (SCG) associated with a second base station,
receive, from the first base station, a second RRC message for deactivating the SCG,
based on the second RRC message for deactivating the SCG, perform an SCG deactivation,
detect a beam failure on a primary secondary cell (PSCell) of the SCG while the SCG is deactivated, and
transmit, to the first base station, a beam failure recovery (BFR) media access control (MAC) control element (CE) for informing the detection of the beam failure on the PSCell of the SCG,
wherein the BFR MAC CE includes information on a candidate beam for the PSCell, and
wherein the UE keeps running a time alignment timer (TAT) of a primary timing advance group (PTAG) that the PSCell belongs to while the SCG is deactivated.
10 . The UE of claim 9 , wherein the controller is further configured to:
based on the reception of the second RRC message for deactivating the SCG, transmit, to the first base station, a confirmation message confirming that the second RRC message is received.
11 . The UE of claim 9 ,
wherein the configuration information includes counter information for detecting the beam failure, and
wherein the beam failure is detected, in case that a counter for beam failure instance indication is equal to or larger than the counter information.
12 . The UE of claim 9 , wherein the configuration information includes at least one of first information associated with a timing advance (TA) or second information on beam failure recovery.
13 . A first base station associated with a master cell group (MCG) in a wireless communication system, the first base station comprising:
a transceiver; and
a controller coupled with the transceiver and configured to:
transmit, to a user equipment (UE), a first radio resource control (RRC) reconfiguration message including configuration information for configuring a secondary cell group (SCG) associated with a second base station,
transmit, to the UE, a second RRC message for deactivating the SCG, and
receive, from the UE, a beam failure recovery (BFR) media access control (MAC) control element (CE) for informing a detection of a beam failure on a primary secondary cell (PSCell) of the SCG, in case that the beam failure on the PSCell of a deactivated state of the SCG is detected,
wherein the BFR MAC CE includes information on a candidate beam for the PSCell, and
wherein a time alignment timer (TAT) of a primary timing advance group (PTAG) that the PSCell belongs to is running while the SCG is deactivated.
14 . The first base station of claim 13 , wherein the controller is further configured to:
receive, from the UE, a confirmation message confirming that the second RRC message is received, as a response to the second RRC message for deactivating the SCG.
15 . The first base station of claim 13 ,
wherein the configuration information includes counter information for detecting the beam failure, and
wherein the beam failure is detected, in case that a counter for beam failure instance indication is equal to or larger than the counter information.
16 . The first base station of claim 13 , wherein the configuration information includes at least one of first information associated with a timing advance (TA) or second information on beam failure recovery.