利索-全球专利检索

  1. 登录
  2. 注册

搜索结果

38 条记录 (耗时 0.021 秒)

    RANDOM ACCESS PROCEDURES FOR SATELLITE COMMUNICATIONS
    2.
    发明公开
    RANDOM ACCESS PROCEDURES FOR SATELLITE COMMUNICATIONS 审中-公开

    公开(公告)号：US20230180306A1

    公开(公告)日：2023-06-08

    申请号：US17838576

    申请日：2022-06-13

    申请人： Telefonaktiebolaget LM Ericsson (publ)

    发明人： Xingqin Lin ,  Shiwei Gao ,  Helka-Liina Määttänen ,  Siva Muruganathan ,  Jonas Sedin ,  Hazhir Shokri Razaghi ,  Zhenhua Zou

    IPC分类号： H04W74/08 ,  H04W76/11 ,  H04W56/00

    CPC分类号： H04W74/0841 ,  H04W76/11 ,  H04W56/0075 ,  H04W84/06

    摘要： Systems and methods are disclosed for random access in a wireless communication system such as, e.g., a wireless communication system having a non-terrestrial (e.g., satellite-based) radio access network. Embodiments of a method performed by a wireless device and corresponding embodiments of a wireless device are disclosed. In some embodiments, a method performed by a wireless device for random access comprises performing an open-loop timing advance estimation procedure to thereby determine an open-loop timing advance estimate for an uplink between the wireless device and a base station. The method further comprises transmitting a random access preamble using the open-loop timing advance estimate. In this manner, random access can be performed even in the presence of a long propagation delay such as that present in a satellite-based radio access network. Embodiments of a method performed by a base station and corresponding embodiments of a base station are also disclosed.

    NPRACH formats for NB-IoT transmission in TDD mode
    3.
    发明授权
    NPRACH formats for NB-IoT transmission in TDD mode 有权

    公开(公告)号：US11357055B2

    公开(公告)日：2022-06-07

    申请号：US16651385

    申请日：2018-09-26

    申请人： Telefonaktiebolaget LM Ericsson (publ)

    发明人： Xingqin Lin ,  Johan Mikael Bergman ,  Andreas Höglund ,  Gerardo Agni Medina Acosta ,  Hazhir Shokri Razaghi ,  Yutao Sui ,  Yi-Pin Eric Wang

    IPC分类号： H04W74/08 ,  H04L5/14

    摘要： Random Access (RA) formats are defined for NB-IoT operation in TDD mode. The formats are defined to allow use of the legacy LTE subframe configurations for TDD. The formats specify a predetermined, even number P of symbol groups composing a RA preamble, wherein each symbol group comprises a Cyclic Prefix (CP) and a number X of symbols. The P symbol groups are divided into symbol group sets fitting into 1, or 2, or 3 contiguous uplink subframes, each comprising at least two symbol groups transmitted back-to-back (i.e., contiguously in time), and at least two symbol group sets are transmitted non-contiguously in time across a number of uplink subframes over which the RA preamble is transmitted. The number of symbol groups in a set can be two or three, and the number of symbol groups is four or six, respectively. Symbol groups within a set are transmitted on adjacent uplink subframes. Five format options are defined, which map to various of the LTE TDD configurations.

    Random access procedures for satellite communications
    7.
    发明授权
    Random access procedures for satellite communications 有权

    公开(公告)号：US11363643B2

    公开(公告)日：2022-06-14

    申请号：US17267546

    申请日：2019-08-07

    申请人： Telefonaktiebolaget LM Ericsson (publ)

    发明人： Xingqin Lin ,  Shiwei Gao ,  Helka-Liina Määttänen ,  Siva Muruganathan ,  Jonas Sedin ,  Hazhir Shokri Razaghi ,  Zhenhua Zou

    IPC分类号： H04W74/08 ,  H04W76/11 ,  H04W56/00 ,  H04W84/06

    摘要： Systems and methods are disclosed for random access in a wireless communication system such as, e.g., a wireless communication system having a non-terrestrial (e.g., satellite-based) radio access network. Embodiments of a method performed by a wireless device and corresponding embodiments of a wireless device are disclosed. In some embodiments, a method performed by a wireless device for random access comprises performing an open-loop timing advance estimation procedure to thereby determine an open-loop timing advance estimate for an uplink between the wireless device and a base station. The method further comprises transmitting a random access preamble using the open-loop timing advance estimate. In this manner, random access can be performed even in the presence of a long propagation delay such as that present in a satellite-based radio access network. Embodiments of a method performed by a base station and corresponding embodiments of a base station are also disclosed.

    SYSTEMS AND METHODS FOR TIMING ADAPTATION FOR SATELLITE COMMUNICATIONS
    9.
    发明申请
    SYSTEMS AND METHODS FOR TIMING ADAPTATION FOR SATELLITE COMMUNICATIONS 有权

    公开(公告)号：US20220006514A1

    公开(公告)日：2022-01-06

    申请号：US17280304

    申请日：2019-09-19

    申请人： Telefonaktiebolaget LM Ericsson (publ)

    发明人： Jonas Sedin ,  Björn Hofström ,  Xingqin Lin ,  Helka-Liina Määttänen ,  Siva Muruganathan ,  Hazhir Shokri Razaghi ,  Zhenhua Zou

    IPC分类号： H04B7/185 ,  H04W74/08 ,  H04L1/18

    摘要： Systems and methods for adapting a timer(s) for a satellite-based radio access network are disclosed. Embodiments of a method performed by a wireless device and corresponding embodiments of a wireless device are disclosed. In some embodiments, a method performed by a wireless device comprises obtaining a value to be used to offset, extend, and/or scale one or more timers related to the satellite-based radio access network relative to values for non-satellite-based radio access networks. The method further comprises utilizing the value to offset a start of one or more timers, extend one or more timers, and/or scale one or more timers and performing one or more actions based on the one or more offset timers, the one or more extended timers, and/or the one or more scaled timers. Embodiments of a method performed by a base station and corresponding embodiments of a base station are also disclosed.

    Network node, wireless device and methods therein relating to time division duplex configurations for narrowband Internet of Things
    10.
    发明授权
    Network node, wireless device and methods therein relating to time division duplex configurations for narrowband Internet of Things 有权

    公开(公告)号：US10985899B2

    公开(公告)日：2021-04-20

    申请号：US16324625

    申请日：2017-06-30

    申请人： Telefonaktiebolaget LM Ericsson (publ)

    发明人： Hazhir Shokri Razaghi ,  Ali Behravan

    IPC分类号： H04L5/14 ,  H04L29/08 ,  H04L5/00

    摘要： A method in a network node is provided. The method comprises determining (1304) a frame structure configuration for a narrowband Internet of Things (NB-IoT) system operating in time division duplex (TDD) mode. The frame structure comprises a plurality of subframes. The plurality of subframes comprises at least one of each of a downlink subframe, an uplink subframe, and a special subframe comprising a gap period during which no transmission occurs. The plurality of subframes is arranged such that the frame structure configuration is compatible with an uplink configuration of the NB-IOT system, e.g. having a subcarrier spacing of 3.75 kHz. The method further comprises communicating the determined frame structure configuration to a wireless device operating in the NB-IoT system.