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    Method and apparatus for applying a time alignment timer in a wireless communication system using a carrier aggregation technique
    5.
    发明授权
    Method and apparatus for applying a time alignment timer in a wireless communication system using a carrier aggregation technique 有权

    公开(公告)号：US09681406B2

    公开(公告)日：2017-06-13

    申请号：US14860068

    申请日：2015-09-21

    Applicant: Samsung Electronics Co., Ltd.

    Inventor： Jae Hyuk Jang ,  Soeng Hun Kim ,  Kyeong In Jeong ,  Boon Loong Ng ,  Gert-Jan Van Lieshout

    IPC: H04W74/08 ,  H04W56/00 ,  H04W64/00 ,  H04W36/04 ,  H04W48/12

    CPC classification number: H04W56/001 ,  H04W36/04 ,  H04W48/12 ,  H04W56/0005 ,  H04W56/0045 ,  H04W64/00 ,  H04W74/0833 ,  Y02D70/126 ,  Y02D70/20

    Abstract: The present invention involves defining the operation of a terminal for determining which time alignment timer is to be applied to a certain condition when specific time alignment timers operate for each carrier-wave group in the event a wireless communication system uses a carrier aggregation technique. According to the present invention, a terminal may perform communication without malfunctions using a time alignment timer suitable for a certain condition. In detail, a method for a terminal to operate a time alignment timer according to the present invention comprises the steps of: receiving, from a base station, a message including a timing advance command and an index on a timing advance group (TAG); and operating the time alignment timer for the TAG, wherein the index has a value of 00 when the TAG includes a first cell. In the meantime, a method for a terminal to operate a time alignment timer according to the present invention comprises the steps of: operating a first time alignment timer for a first timing advance group (TAG) including a first cell; operating a second time alignment timer upon receipt of a timing advance command for a second TAG that does not include the first cell; and, if the first time alignment timer has expired, deeming the second time alignment timer to also be expired. In addition, a method for a base station to control a time alignment timer according to the present invention comprises the steps of: determining whether or not an uplink timing of a terminal needs correction; and transmitting a message including a timing advance command and an index on a timing advance group (TAG), wherein the index has a value of 00 when the TAG includes a first cell.

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