Method and apparatus for switching bandwidth part during random access procedure in wireless communication system
The present invention relates to a method of performing a random access (RA) procedure by a user equipment (UE) in a wireless communication system. Especially, the method includes the steps of transmitting a RA preamble to a network on a first bandwidth part (BWP); receiving a response message of the RA preamble from the network, wherein the response message includes a BWP switch indication indicating a second BWP and an uplink (UL) grant on the second BWP; and transmitting an uplink data or a connection request message to the network on the second BWP using the UL grant.
1. A method comprising:
transmitting, by a user equipment (UE), a random access (RA) preamble and uplink (UL) data to a network on a first bandwidth part (BWP) allowed to transmit uplink data in a Radio Resource Control (RRC) INACTIVE state;
receiving, by the UE, a response message of the RA preamble from the network,
wherein, based on the RA preamble being transmitted successfully and the UL data not being transmitted successfully due to a congestion of the first BWP, the response message includes a BWP switch indication; and
based on the BWP switch indication indicating a second BWP allowed to transmit the uplink data in the RRC INACTIVE state, retransmitting, by the UE, the uplink data to the network on the second BWP using a UL grant.
2. The method of claim 1 , further comprising:
based on the BWP switch indication indicating a third BWP configured to perform a RA procedure for shifting to a RRC CONNECTED state from the RRC INACTIVE state, transmitting a connection request message to the network on the third BWP.
3. The method of claim 2 , further comprising:
receiving a contention resolution message as a response to the connection request message on the third BWP.
4. A user equipment (UE) comprising:
at least one processor; and
at least one computer memory storing instructions that, when executed by the at least one processor, cause the UE to perform operations comprising:
transmitting a random access (RA) preamble and uplink (UL) data to a network on a first bandwidth part (BWP) allowed to transmit uplink data in a Radio Resource Control (RRC) INACTIVE state;
receiving a response message of the RA preamble from the network,
wherein, based on the RA preamble being transmitted successfully and the UL data not being transmitted successfully due to a congestion of the first BWP, the response message includes a BWP switch indication; and
based on the BWP switch indication indicating a second BWP allowed to transmit the uplink data in the RRC INACTIVE state, retransmitting the uplink data to the network on the second BWP using a UL grant.
5. The UE of claim 4 , wherein the operations further comprise:
based on the BWP switch indication indicating a third BWP configured to perform a RA procedure for shifting to a RRC CONNECTED state from the RRC INACTIVE state, transmitting a connection request message to the network on the third BWP.
6. The UE of claim 5 , wherein the operations further comprise receiving a contention resolution message as a response to the connection request message on the third BWP.
7. An apparatus for a user equipment (UE), the apparatus comprising:
at least one processor; and
at least one computer memory storing instructions that, when executed by the at least one processor, cause the UE to perform operations comprising:
transmitting a random access (RA) preamble and uplink (UL) data to a network on a first bandwidth part (BWP) allowed to transmit uplink data in a Radio Resource Control (RRC) INACTIVE state;
receiving a response message of the RA preamble from the network,
wherein, based on the RA preamble being transmitted successfully and the UL data not being transmitted successfully due to a congestion of the first BWP, the response message includes a BWP switch indication; and
based on the BWP switch indication indicating a second BWP allowed to transmit the uplink data in the RRC INACTIVE state, retransmitting the uplink data to the network on the second BWP using a UL grant.
8. A non-transitory computer readable storage medium storing program instructions that, when executed by at least one processor, cause a user equipment (UE) to perform operations comprising:
transmitting a random access (RA) preamble and uplink (UL) data to a network on a first bandwidth part (BWP) allowed to transmit uplink data in a Radio Resource Control (RRC) INACTIVE state;
receiving a response message of the RA preamble from the network,
wherein, based on the RA preamble being transmitted successfully and the UL data not being transmitted successfully due to a congestion of the first BWP, the response message includes a BWP switch indication; and
based on the BWP switch indication indicating a second BWP allowed to transmit the uplink data in the RRC INACTIVE state, retransmitting the uplink data to the network on the second BWP using a UL grant.