Enhanced capability exchange procedure for radio access technology change

An apparatus for wireless communications, comprising:

• means for communicating with a first base station (BS) via a connection of a first radio access technology (RAT);
• means for determining, based on determining that the first RAT comprises a legacy RAT and that the UE is to be transitioned to operating on a second RAT comprising a non-legacy RAT, to omit information about a capability of the UE to support carrier aggregation in operations using the second RAT from capabilities information of the UE regarding the second RAT;
• means for obtaining an indication from the first BS to transition the connection to the second RAT;
• means for transmitting the capabilities information of the UE regarding the second RAT, excepting the omitted information about the capability of the UE to support carrier aggregation in operations using the second RAT, to the first BS via the first RAT, wherein the transmitting the capabilities information is in response to obtaining the indication
• means for communicating with a second BS via the second RAT using a single carrier according to the capabilities information;
• means for sending an update of the capabilities information of the UE regarding the second RAT via the second RAT, the update including at least the information about a capability of the UE to support carrier aggregation in operations using the second RAT;
• and
• means for communicating, based on sending the update, with the second BS via the second RAT using carrier aggregation over a plurality of carriers.

An apparatus for wireless communications, comprising:

• a processor configured to:
• communicate with a first base station (BS) via a connection of a first radio access technology (RAT);
• determine, based on determining that the first RAT comprises a legacy RAT and that the UE is to be transitioned to operating on a second RAT comprising a non-legacy RAT, to omit information about a capability of the UE to support carrier aggregation in operations using the second RAT from capabilities information of the UE regarding the second RAT;
• obtain an indication from the first BS to transition the connection to the second RAT
• transmit the capabilities information of the UE regarding the second RAT, excepting the omitted information about the capability of the UE to support carrier aggregation in operations using the second RAT, to the first BS via the first RAT, wherein the capabilities information is transmitted in response to obtaining the indication;
• communicate with a second BS via the second RAT using a single carrier according to the capabilities information;
• send an update of the capabilities information of the UE regarding the second RAT via the second RAT, the update including at least the information about a capability of the UE to support carrier aggregation in operations using the second RAT;
• and
• based on sending the update, communicate with the second BS via the second RAT using carrier aggregation over a plurality of carriers;
• and
• a memory coupled with the processor.

A non-transitory computer-readable medium comprising instructions, the instructions when executed by a processor cause the processor to perform operations comprising:

• causing a user equipment (UE) to communicate with a first base station (BS) via a connection of a first radio access technology (RAT);
• causing the UE to determine, based on determining that the first RAT comprises a legacy RAT and that the UE is to be transitioned to operating on a second RAT comprising a non-legacy RAT, to omit information about a capability a set of capabilities of the UE to support carrier aggregation in operations using the second RAT from capabilities information of the UE regarding the second RAT;
• causing the UE to obtain an indication from the first BS to transition the connection to the second RAT;
• causing the UE to transmit the capabilities information of the UE regarding the second RAT, excepting the omitted information about the capability of the UE to support carrier aggregation in operations using the second RAT, to the first BS via the first RAT, wherein the capabilities information is transmitted in response to obtaining the indication;
• causing the UE to communicate with a second BS via the second RAT using a single carrier according to the capabilities information;
• causing the UE to send an update of the capabilities information of the UE regarding the second RAT via the second RAT, the update including at least the information about a capability of the UE to support carrier aggregation in operations using the second RAT;
• and
• causing the UE to communicate, based on sending the update, with the second BS via the second RAT using carrier aggregation over a plurality of carriers.