Uplink timing synchronization maintenance in secondary cell group

    公开(公告)号:US11943722B2

    公开(公告)日:2024-03-26

    申请号:US17439451

    申请日:2021-03-31

    Applicant: Apple Inc.

    CPC classification number: H04W56/0005 H04W24/08 H04W74/0833 H04W76/15

    Abstract: Aspects are presented herein of apparatuses, systems, and methods for secondary cell group (SCG) addition. A wireless device may establish communication with a first base station that is comprised in a master cell group (MCG) and a second base station that is comprised in the SCG. The wireless device may maintain timing advance (TA) parameters for performing uplink communication with the second base station. The wireless device may perform a plurality of signal quality measurements after receiving an indication to deactivate the SCG. The wireless device may determine whether to reuse the TA parameters for communicating with the second base station after receiving an indication. The determination may be based on comparing one or more signal quality measurements of the second base station to one or more signal quality thresholds.

    MBS-key distribution and traffic protection

    公开(公告)号:US11882435B2

    公开(公告)日:2024-01-23

    申请号:US17593506

    申请日:2020-10-29

    Applicant: APPLE INC.

    CPC classification number: H04W12/037 H04L9/0825 H04L9/14 H04W4/08 H04W12/041

    Abstract: MBS key distribution includes processing group information associated with an MB session context received from an AF. At least a portion of the group information comprises a TMGI. A plurality of session join requests received from a plurality of UEs are processed. Each of the plurality of session join requests include the TMGE and are associated with the MB session context. A request associated with the MB session context for transmission to an MB-SMF is encoded. A response associated with the MB session context received from the MB-SMF is processed. The response includes a key derived for each of a portion of the plurality of UEs using a UE ID and the TMGI. A DL NAS message and an N2 message are encoded for the plurality of UEs and a base station, respectively. The DL NAS message and the N2 message include the derived key.

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