Base station and method thereof
AssigneeNEC Corporation
InventorsHisashi Futaki, Sadafuku Hayashi
Life of this patent
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Abstract
A secondary base station (2) is configured to receive an SeNB addition request message from a second master base station (3) while providing a radio terminal (1) with a secondary cell group (SCG) for DC in cooperation with a first master base station. The SeNB addition request message indicates whether each of at least one bearer that has already been configured in the secondary base station (2) for DC with the first master base station (1) is to be kept at the secondary base station (2). It is thus, for example, possible to contribute to performing a procedure for changing a master base station in Dual Connectivity (DC) by using existing inter-base station interface procedures and inter-base station signaling messages.
Claims15
A secondary base station comprising:
- at least one radio transceiver;
- and
- at least one processor coupled to the at least one radio transceiver, wherein
- the at least one processor is configured to receive a Secondary RAN node addition request message from a second master base station while the secondary base station provides a radio terminal with a secondary cell group (SCG) for dual connectivity in cooperation with a first master base station, and
- the Secondary RAN node addition request message includes one or both of:
- a first list indicating one or more first bearers to be kept at the secondary base station;
- and a second list indicating one or more second bearers that do not need to be kept at the secondary base station, to indicate whether each of at least one bearer that has already been configured in the secondary base station for the dual connectivity is to be kept at the secondary base station.
A method in a secondary base station comprising:
- receiving a Secondary RAN node addition request message from a second master base station while providing a radio terminal with a secondary cell group (SCG) for dual connectivity in cooperation with a first master base station, the Secondary RAN node addition request message including one or both of:
- a first list indicating one or more first bearers to be kept at the secondary base station;
- and a second list indicating one or more second bearers that do not need to be kept at the secondary base station, to indicate whether each of at least one bearer that has already been configured in the secondary base station for the dual connectivity is to be kept at the secondary base station;
- and
- upon receiving the Secondary RAN node addition request message, distinguishing the one or more first bearers to be kept at the secondary base station from the one or more second bearers that do not need to be kept at the secondary base station.
A second master base station comprising:
- at least one radio transceiver;
- and
- at least one processor coupled to the at least one radio transceiver, wherein
- the at least one processor is configured to send a Secondary RAN node addition request message to a secondary base station while the secondary base station provides a radio terminal with a secondary cell group (SCG) for dual connectivity in cooperation with a first master base station, and
- the Secondary RAN node addition request message including one or both of:
- a first list indicating one or more first bearers to be kept at the secondary base station;
- and a second list indicating one or more second bearers that do not need to be kept at the secondary base station, to indicate whether each of at least one bearer that has already been configured in the secondary base station for the dual connectivity is to be kept at the secondary base station.
Dependencies are inferred from the claim text.