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    EFFICIENT TRACKING AREA UPDATE IN LEO-NTN
    32.
    发明公开
    EFFICIENT TRACKING AREA UPDATE IN LEO-NTN 审中-公开

    公开(公告)号：US20230208505A1

    公开(公告)日：2023-06-29

    申请号：US17996443

    申请日：2021-04-21

    申请人： MediaTek Singapore Pte. Ltd.

    发明人： Abhishek ROY ,  Chia-Chun HSU ,  Pradeep JOSE ,  Mehmet KUNT

    IPC分类号： H04B7/185

    CPC分类号： H04B7/18504 ,  H04B7/18513

    摘要： Low Earth Orbit (LEO) satellites orbit around the earth at a high speed (mobility), but over a predictable or deterministic orbit. In this invention, an efficient mechanism to include a list of multiple Tracking Area Codes (TAC List) in LEO-NTN is proposed for efficient tracking area update (TAU). Each cell broadcasts a TAC list corresponding to all the tracking areas it covers as it moves, dynamically. A UE selects a cell and is registered with a TA during initial registration and cell selection. As the satellite moves, the UE reselects another cell during cell reselection. The UE triggers a TAU only if its current TA does not match with any tracking area code of the TAC List broadcasted by the reselected cell. By using the concept of TAC list, it significantly reduces the TAU signaling overhead in LEO-NTN.

    Interference canceling by fixed division of feeder link transmission band in multiple gateway HAPS system
    33.
    发明授权
    Interference canceling by fixed division of feeder link transmission band in multiple gateway HAPS system 有权

    公开(公告)号：US11652537B2

    公开(公告)日：2023-05-16

    申请号：US17442176

    申请日：2020-02-13

    申请人： HAPSMobile Inc.

    发明人： Takafumi Fujii ,  Teruya Fujii

    IPC分类号： H04B7/185 ,  H04B7/06 ,  H04B7/204 ,  H04J1/10 ,  H04B7/0413

    CPC分类号： H04B7/18504 ,  H04B7/0617 ,  H04B7/2041 ,  H04J1/10 ,  H04B7/0413

    摘要： Interference in multi-feeder links of a same frequency between an aerial-floating type communication relay apparatus and plural gateway (GW) stations is suppressed. A transmission signal band of a feeder link is divided into plural divided frequency bands, and plural propagation path responses between plural GW stations and an antenna for feeder link of the communication relay apparatus are respectively estimated with respect to each of plural divided frequency bands, by setting a center frequency of the divided frequency band as an estimation frequency, based on a reception result of the pilot signals respectively received from the plural GW stations and separated from each other. A weight for suppressing an interference signal that causes an interference by a transmission signal transmitted from the GW station and received with a directional beam corresponding to another GW station is calculated for each of the divided frequency bands based on the plural propagation path responses. A reception signal received with the directional beam corresponding to the other GW station is multiplied by the weight corresponding to the other GW station and subtracted from the reception signal received with the directional beam corresponding to the other GW station, for each of the divided frequency bands.

    Network Capacity Management
    34.
    发明申请
    Network Capacity Management 审中-公开

    公开(公告)号：US20190222297A1

    公开(公告)日：2019-07-18

    申请号：US16359532

    申请日：2019-03-20

    申请人： Wing Aviation LLC

    发明人： David Vos ,  Andrew Patton ,  Sean Mullaney ,  Behnam Motazed ,  Siegfried Zerweckh

    IPC分类号： H04B7/185

    CPC分类号： H04B7/18506 ,  H04B7/18504 ,  H04W24/02 ,  H04W84/005 ,  H04W84/047

    摘要： An example embodiment may involve flying, by an unmanned aerial vehicle (UAV), to a geographical location, where a wireless router is at the geographical location. The example embodiment may also involve detecting, by the UAV, a wireless coverage area defined by the wireless router. The example embodiment may also involve accessing, by the UAV, the wireless coverage area using a network identifier and a password. The example embodiment may also involve establishing, by the UAV, a backhaul link to a data network. The example embodiment may also involve transmitting, by the UAV, a notification to a client device served by the wireless coverage area, where the notification indicates that the UAV is a default gateway for the wireless coverage area. The example embodiment may also involve exchanging, by the UAV, data transmissions between (i) the client device, and (ii) one or more other devices accessible via the data network.

    AIR INTERFACE PROTOCOLS FOR BROADBAND ACCESS TO AERIAL PLATFORMS
    35.
    发明申请
    AIR INTERFACE PROTOCOLS FOR BROADBAND ACCESS TO AERIAL PLATFORMS 审中-公开

    公开(公告)号：US20190173567A1

    公开(公告)日：2019-06-06

    申请号：US16205641

    申请日：2018-11-30

    申请人： Parviz Jalali

    发明人： Parviz Jalali

    IPC分类号： H04B7/185 ,  H04W72/04 ,  H04W16/28 ,  H04W72/08

    CPC分类号： H04B7/18504 ,  H04W16/28 ,  H04W24/02 ,  H04W72/044 ,  H04W72/085 ,  H04W84/005

    摘要： An air interface for a terrestrial communications network for providing broadband internet access to aerial platforms is described. In some embodiments, systems and methods are described for efficient retransmission of data packets that are not received correctly. In other embodiments, systems and methods are described for determining the modulation constellation and error correction code rate used in transmitting a data packet to maximize data rates. In another set of embodiments, the retransmission scheme and modulation constellation and error correction code rate determination are jointly optimized to maximize data rates.

    GEOSTATIONARY HIGH ALTITUDE PLATFORM
    38.
    发明申请
    GEOSTATIONARY HIGH ALTITUDE PLATFORM 审中-公开

    公开(公告)号：US20180294870A1

    公开(公告)日：2018-10-11

    申请号：US15766953

    申请日：2016-10-07

    申请人： Erinn Van Wynsberghe

    发明人： Erinn Van Wynsberghe

    IPC分类号： H04B7/185 ,  B64B1/44 ,  H02J50/23 ,  H02J50/27

    CPC分类号： H04B7/18504 ,  B64B1/44 ,  B64D47/00 ,  H02J50/23 ,  H02J50/27

    摘要： A geostationary platform is held afloat by a superpressure balloon. A suitable altitude is 25 km. The craft carries electrohydrodynamic thrusters, to overcome winds, held within a scaffold. Sensors determine position, velocity, acceleration and vector. A CPU performs instructions for station-keeping or navigation. A communication system is included to, inter alia, receive instructions from the ground. The craft carries a payload for observation and transmission, cradled in a temperature-controlled chamber. Power to the platform is transmitted in the form of electromagnetic waves (with suitable frequencies including microwaves of 2.45 GHz or 5.8 GHz) from a ground-based transmitter to a receiving antenna on, or affixed to, the balloon which converts the electromagnetic energy to direct current. A step-up voltage converter increases the voltage as required. A ground station monitors craft position and operational efficiency by radar to help ensure safe takeoff, operation, and landing of the craft.