| CPC H04W 76/16 (2018.02) [H04W 92/20 (2013.01)] | 11 Claims |
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1. A method performed by a central unit-user plane (CU-UP) included in a secondary base station in a wireless communication system, the method comprising:
receiving, from a central unit-control plane (CU-CP) included in the secondary base station, a first message for requesting of a bearer context setup;
transmitting, to the CU-CP, a second message as a response to the first message;
receiving, from the CU-CP, a third message including packet data convergence protocol (PDCP) sequence number status information and information associated with a change of a bearer type, wherein the change of the bearer type includes a change in a PDCP version of a bearer;
identifying whether there is the change in the PDCP version of the bearer based on the third message;
allocating a PDCP sequence number to at least one downlink packet received through the bearer based on whether there is the change in the PDCP version of the bearer; and
aligning a sequence of at least one uplink packet received through the bearer based on whether there is the change in the PDCP version of the bearer,
wherein the PDCP sequence number status information includes count information for uplink and count information for downlink.
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5. A central unit-user plane (CU-UP) included in a secondary base station in a wireless communication system, the CU-UP comprising:
a transceiver; and
a processor configured to:
receive, from a central unit-control plane (CU-CP) included in the secondary base station, a first message for requesting of a bearer context setup,
transmit, to the CU-CP, a second message as a response to the first message,
receive, from the CU-CP, a third message including packet data convergence protocol (PDCP) sequence number status information and information associated with a change of a bearer type, wherein the change of the bearer type includes a change in a PDCP version of a bearer,
identify whether there is the change in the PDCP version of the bearer based on the third message,
allocate a PDCP sequence number to at least one downlink packet received through the bearer based on whether there is the change in the PDCP version of the bearer, and
align a sequence of at least one uplink packet received through the bearer based on whether there is the change in the PDCP version of the bearer,
wherein the PDCP sequence number status information includes count information for uplink and count information for downlink.
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6. A method performed by a central unit-control plane (CU-CP) included in a secondary base station in a wireless communication system, the method comprising:
transmitting, to a central unit-user plane (CU-UP) included in the secondary base station, a first message for requesting of a bearer context setup;
receiving, from the CU-UP, a second message as a response to the first message; and
transmitting, to the CU-UP, a third message including packet data convergence protocol (PDCP) sequence number status information and information associated with a change of a bearer type, wherein the change of the bearer type includes a change in a PDCP version of a bearer,
wherein the PDCP sequence number status information includes count information for uplink and count information for downlink,
wherein whether there is the change in the PDCP version of the bearer is identified based on the third message,
wherein a PDCP sequence number allocated to at least one downlink packet received through the bearer is based on whether there is the change in the PDCP version of the bearer, and
wherein alignment of a sequence of at least one uplink packet received through the bearer is based on whether there is the change in the PDCP version of the bearer.
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9. A central unit-control plane (CU-CP) included in a secondary base station in a wireless communication system, the CU-CP comprising:
a transceiver; and
a processor configured to:
transmit, to a central unit-user plane (CU-UP) included in the secondary base station, a first message for requesting of a bearer context setup,
receive, from the CU-UP, a second message as a response to the first message, and
transmit, to the CU-UP, a third message including packet data convergence protocol (PDCP) sequence number status information and information associated with a change of a bearer type, wherein the change of the bearer type includes a change in a PDCP version of a bearer,
wherein the PDCP sequence number status information includes count information for uplink and count information for downlink,
wherein whether there is the change in the PDCP version of the bearer is identified based on the third message,
wherein a PDCP sequence number allocated to at least one downlink packet received through the bearer is based on whether there is the change in the PDCP version of the bearer, and
wherein alignment of a sequence of at least one uplink packet received through the bearer is based on whether there is the change in the PDCP version of the bearer.
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