公开(公告)号：WO2013177562A1

公开(公告)日：2013-11-28

申请号：PCT/US2013/042740

申请日：2013-05-24

Applicant: HUGHES NETWORK SYSTEMS, LLC

Inventor： ARUR, Deepak ,  RAVISHANKAR, Channasandra ,  BENAMMAR, Nassir ,  ZAKARIA, Gaguk ,  MIRRA, Steve

IPC: H04B1/38

CPC classification number: H04W4/10 ,  H04W76/40

Abstract: A resource efficient approach for push-to-talk (PTT) services over a mobile communications network is provided. A remote terminal (UT) receives a command for initiating a PTT session. The UT generates a RAB binding create message, including a PTT session identifier and RAB binding information, and transmits the RAB binding create message to a wireless gateway. The UT receives a RAB binding response from the wireless gateway, and performs a protocol signaling process for establishing PDP bearers, and for establishing the PTT session on a PTT server. The UT receives a command for initiation of media transmission for the PTT session, generates talk burst (TB) request message, and transmits the request message to the wireless gateway (the TB request message is transmitted via media access control (MAC) layer control messaging). In response, the UT receives a talk burst grant message from the wireless gateway.

Abstract translation: 提供了一种通过移动通信网络进行即按即说（PTT）服务的资源有效方法。 远程终端（UT）接收用于发起PTT会话的命令。 UT生成RAB绑定创建消息，包括PTT会话标识符和RAB绑定信息，并将RAB绑定创建消息发送到无线网关。 UT从无线网关接收RAB绑定响应，并执行用于建立PDP承载的协议信令处理，并在PTT服务器上建立PTT会话。 UT接收到用于PTT会话的媒体发送的启动命令，生成通话突发（TB）请求消息，并将该请求消息发送到无线网关（通过媒体接入控制（MAC）层控制消息传送 ）。 作为响应，UT从无线网关接收到通话突发授权消息。

公开(公告)号：WO2019144078A1

公开(公告)日：2019-07-25

申请号：PCT/US2019/014421

申请日：2019-01-21

Applicant: HUGHES NETWORK SYSTEMS, LLC

Inventor： ARUR, Deepak ,  RAVISHANKAR, Channasandra ,  BENAMMAR, Nassir ,  BARNETT, Charles ,  CORRIGAN, John

IPC: H04W36/24 ,  H04W40/18 ,  H04W36/30 ,  H04B7/185

Abstract: A method for prediction of UT handovers in a satellite communications network is provided. Optimal characteristics regarding the beams of satellites and regarding a one UT are determined. For each of a plurality of the satellite beams, for each of a plurality of instants of time t n , an estimated signal strength as seen at the UT is determined, wherein each estimated signal strength is determined based on the optimal at the respective time t n . A next instant of time t m is determined at which the estimated signal strength for a candidate beam that is within the view of the UT is greater than or equal to the estimated signal strength for the satellite beam that is currently servicing the UT. A handover of the UT, at the time t m , from the satellite beam that is currently servicing the one UT to the candidate beam is determined.

公开(公告)号：WO2015143252A1

公开(公告)日：2015-09-24

申请号：PCT/US2015/021615

申请日：2015-03-19

Applicant: HUGHES NETWORK SYSTEMS, LLC

Inventor： VASAVADA, Yash ,  RAVISHANKAR, Channasandra ,  ARUR, Deepak ,  PARR, Michael

IPC: H04B7/185

CPC classification number: H04B7/1851 ,  H04B7/185 ,  H04B7/195 ,  H04W56/00

Abstract: A synchronization approach is provided that compensates for the large Doppler offset of the satellites in a LEO satellite system by exploiting the predictable and deterministic nature of the Doppler component, and thereby simplifies the delay and the Doppler domain uncertainty ranges that the physical layer receivers have to resolve. The compensation is based on the known ephemeris information of the LEO satellite and the known positions of the gateway (GW) and the user terminal (UT) on the ground. Utilizing the deterministic component of the LEO Doppler, the synchronization process continually tracks and compensates for the time-varying offsets between the GW and UT frame timing, frame numbering (FN), symbol timings, and Doppler-induced scaling of center frequency and the signal bandwidth.

Abstract translation: 提供了同步方法，其通过利用多普勒分量的可预测和确定性来补偿LEO卫星系统中的卫星的大的多普勒偏移，从而简化了物理层接收机必须具有的延迟和多普勒域不确定性范围 解决。 补偿基于LEO卫星的已知星历信息和地面上的网关（GW）和用户终端（UT）的已知位置。 利用LEO多普勒的确定性分量，同步过程连续地跟踪和补偿GW与UT帧定时，帧编号（FN），符号定时和中心频率的多普勒感应缩放之间的时变偏移 带宽。

公开(公告)号：WO2013177345A1

公开(公告)日：2013-11-28

申请号：PCT/US2013/042320

申请日：2013-05-22

Applicant: HUGHES NETWORK SYSTEMS, LLC

Inventor： RAVISHANKAR, Channasandra ,  ARUR, Deepak ,  BENAMMAR, Nassir

IPC: H04W80/00

CPC classification number: H04W72/005 ,  H04L12/1836 ,  H04L12/189 ,  H04W36/026 ,  H04W36/14 ,  H04W76/40

Abstract: Approaches for resource efficient multicast communications in mobile satellite systems are provided. A wireless gateway is configured to encapsulate multicast signaling messages received from participating remote terminals. The encapsulation is compatible with the core network of the system, whereby the signaling is passed through the core network undetected. The signaling is received by a multicast gateway, and provides necessary IP and port addressing information for the multicast gateway to encapsulate the multicast session data in a manner compatible with the core network. Upon receiving multicast session data from a multicast server, the multicast gateway replicates and encapsulates each data packet with IP and port addressing for each participating remote terminal, which is also passed through the core network undetected. The wireless gateway receives the replicated data packets, and based on the encapsulation information, transmits each data packet via a broadcast transmission to each cell wherein participating terminals are located.

Abstract translation: 提供了移动卫星系统中资源有效的多播通信的方法。 无线网关被配置为封装从参与的远程终端接收的多播信令消息。 封装与系统的核心网络兼容，从而信令通过核心网络未被检测到。 信令由多播网关接收，为多播网关提供必要的IP和端口寻址信息，以与核心网兼容的方式封装多播会话数据。 在从组播服务器接收到组播会话数据后，组播网关对每个参与的远程终端进行IP和端口寻址的每个数据包进行复制和封装，并通过未被检测到的核心网。 无线网关接收复制数据包，并且基于封装信息，通过广播传输将每个数据包发送到参与终端所在的每个小区。

公开(公告)号：WO2020142342A1

公开(公告)日：2020-07-09

申请号：PCT/US2019/068546

申请日：2019-12-26

Applicant: HUGHES NETWORK SYSTEMS, LLC

Inventor： ARUR, Deepak ,  RAVISHANKAR, Channasandra

IPC: H04B7/185 ,  H04B7/204

Abstract: Methods, systems, and apparatus, including computer-readable media, for location management for satellite systems. In some implementations, a controller of a satellite network system receives location data from a user terminal and registers the user terminal in a mobility area with a core network. The controller updates a mapping between satellite beams and mobility areas as the satellite beams move along the ground with respect to the mobility areas, then uses the updated mapping to communicate with the user terminal using an appropriate satellite beam. In some implementations, a controller of a satellite network system determines a mapping of satellite beams to mobility areas, and broadcasts, for each of multiple satellite beams, a message indicating (i) a set of mobility areas that are at least partially covered by the satellite beam and (ii) an indication of boundaries of the mobility areas in the set of mobility areas.

公开(公告)号：WO2020132201A1

公开(公告)日：2020-06-25

申请号：PCT/US2019/067407

申请日：2019-12-19

Applicant: HUGHES NETWORK SYSTEMS, LLC

Inventor： RAVISHANKAR, Channasandra ,  CORRIGAN, John ,  ARUR, Deepak

IPC: H04B7/185

Abstract: Embodiments disclosed herein relate generally to techniques for mitigating blockages associated with satellite systems. More specifically, techniques disclosed herein, describe solutions for minimizing service interruption during satellite handover. One or more blockages associated with one or more user terminals that connect to a satellite system may be determined by various means. Utilizing those blockages, handover times for the one or more user terminals may be determined such that service interrupts may be minimized.

公开(公告)号：WO2015191138A2

公开(公告)日：2015-12-17

申请号：PCT/US2015/021377

申请日：2015-03-19

Applicant: HUGHES NETWORK SYSTEMS, LLC

Inventor： BENAMMAR, Nassir ,  ARUR, Deepak ,  RAVISHANKAR, Channasandra ,  VASAVADA, Yash

CPC classification number: H04W36/30 ,  H04B7/18517 ,  H04B7/18541 ,  H04W36/0083 ,  H04W36/10 ,  H04W36/14 ,  H04W36/165 ,  H04W84/06

Abstract: Approaches for efficient, dynamic and continuous handover processes, which encompass selection of an optimal path (consisting of a satellite, a satellite beam and carrier frequency set) over which a mobile user terminal (UT) communicates with the radio access network in a mobile satellite communications system, are provided. A set of path factors are determined regarding each of a plurality of communications paths for the UT. A path selection metric (PSM) for each communications path is determined, wherein the PSM for each communications path is determined via a weighted calculation based on the respective set of path factors for the communications path. A decision is made as to whether to perform a handover of the UT from a first of the communications paths to a second of the communications paths, wherein the determination is based on an evaluation performed based at least in part on the PSM.

Abstract translation: 高效，动态和连续的切换过程的方法包括选择移动用户终端（UT）与移动卫星中的无线电接入网络通信的最佳路径（由卫星，卫星波束和载波频率集合组成） 通讯系统。 关于UT的多个通信路径中的每一个确定一组路径因子。 确定每个通信路径的路径选择度量（PSM），其中针对每个通信路径的PSM基于用于通信路径的相应路径因子集合的加权计算来确定。 做出关于是否执行UT从第一通信路径到第二通信路径的切换的决定，其中所述确定基于至少部分地基于PSM执行的评估。