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    Handover in connected mode between non-terrestrial-network and terrestrial network
    1.
    发明授权
    Handover in connected mode between non-terrestrial-network and terrestrial network 有权

    公开(公告)号：US10805850B1

    公开(公告)日：2020-10-13

    申请号：US16730896

    申请日：2019-12-30

    申请人： Nassir Benammar ,  Channasandra Ravishankar ,  Gaguk Zakaria

    发明人： Nassir Benammar ,  Channasandra Ravishankar ,  Gaguk Zakaria

    IPC分类号： H04W36/00 ,  H04W36/14 ,  H04W36/38 ,  H04M1/725 ,  H04W88/02 ,  H04W36/12 ,  H04W36/18

    摘要： A system and a method for directing a handover of communications in Radio Frequency (RF) networks at a UT. The method includes servicing a user terminal (UT) via a first network having a first coverage area; receiving, from the UT via the first network, a measurement report for a second network having a second coverage area based on a measurement configuration of the second network; sending, to the UT via the first network, a handover order for obtaining service from the second network; and establishing, via a second network RAN (radio access network), a service for the UT via the second network per the handover order. In the method, the first network may include either a terrestrial network (TN) or a non-terrestrial network (NTN), the second network may include other of the TN or the NTN, and the TN and the NTN are RF networks. In the method, the establishing is performed while the UT is disposed in an overlap area of the first coverage area and the second coverage area, and the measurement report may include a RF signal metric of the second network at the UT.

    SYSTEM AND METHOD FOR ENHANCED PAGING AND QUALITY OF SERVICE ESTABLISHMENT IN MOBILE SATELLITE SYSTEMS
    2.
    发明申请
    SYSTEM AND METHOD FOR ENHANCED PAGING AND QUALITY OF SERVICE ESTABLISHMENT IN MOBILE SATELLITE SYSTEMS 审中-公开
    移动卫星系统中增强呼叫和服务质量的系统和方法

    公开(公告)号：US20130217422A1

    公开(公告)日：2013-08-22

    申请号：US13398763

    申请日：2012-02-16

    申请人： Gaguk Zakaria ,  Channasandra Ravishankar

    发明人： Gaguk Zakaria ,  Channasandra Ravishankar

    IPC分类号： H04W68/00

    CPC分类号： H04B7/18539 ,  H04B7/18543 ,  H04B7/18567 ,  H04W68/025 ,  H04W76/12

    摘要： A system and method is provided to enable enhanced paging for 3GPP IMS based Mobile Satellite Communication is presented. The method is achieved by utilizing the network requested secondary PDP context activation (NRSPCA) features of 3GPP release 7. NRSPCA involves interaction between P-CSCF, GGSN, and SGSN that eventually allows SGSN to identify the traffic type of the incoming call without looking at the compressed SIP messages. RAN can do enhanced paging, if necessary; based on the request secondary PDP context activation message, if the Paging Cause is indicating conversational class. In another embodiment, enhanced paging can be achieved by marking the packet with an appropriate DSCP code, which is done by the P-CSCF. SGSN can populate the paging cause with enhanced paging code based on the DSCP code provided or RAN can escalate paging to enhanced paging by examining the DSCP code.

    摘要翻译： 提供了一种系统和方法，以提供用于3GPP IMS的移动卫星通信的增强寻呼。 该方法通过利用3GPP版本7的网络请求的辅助PDP上下文激活（NRSPCA）特征来实现.NRSPCA涉及P-CSCF，GGSN和SGSN之间的交互，其最终允许SGSN识别来电的业务类型而不查看 压缩的SIP消息。 如果需要，RAN可以进行增强的寻呼; 根据请求次PDP上下文激活消息，如果分页原因指示会话类。 在另一个实施例中，可以通过用由P-CSCF完成的适当的DSCP代码来标记分组来实现增强的寻呼。 SGSN可以基于提供的DSCP代码来填充寻呼原因，RAN可以通过检查DSCP码将寻呼升级到增强寻呼。

    Method and system of providing second generation (2G) voice services over Internet protocol
    3.
    发明授权
    Method and system of providing second generation (2G) voice services over Internet protocol 有权

    公开(公告)号：US11223666B2

    公开(公告)日：2022-01-11

    申请号：US16694106

    申请日：2019-11-25

    申请人： Channasandra Ravishankar ,  Gaguk Zakaria

    发明人： Channasandra Ravishankar ,  Gaguk Zakaria

    IPC分类号： H04L29/06 ,  H04W84/06 ,  H04W88/16 ,  H04W92/14 ,  H04W92/06 ,  H04W92/02 ,  H04L12/66

    摘要： A system to provide second generation (2G) voice services over internet protocol, the system including: a voice gateway (VGW) including a 2G stack to communicate control plane information and user plane information with a 2G user terminal (UT) via a circuit-switched network without modifications to the 2G-UT, an Iu-CS IP stack, and a relay to map the control plane information between the 2G stack and the Iu-CS IP stack, and vice-versa; a mobile switching center (MSC), connected to the VGW via the Iu-CS IP stack, to manage and establish the voice services between the 2G-UT and a public switched telephone network (PSTN) based on the mapped control plane information; and a media gateway (MGW) connected to the VGW via the Iu-CS IP stack, where the MGW communicates the user plane information between the 2G-UT and the PSTN after the MSC 2-G UT vocoder, e.g. AMBE, has established voice services.

    Placement of calibration earth stations for ground based beam forming in a satellite system
    4.
    发明授权
    Placement of calibration earth stations for ground based beam forming in a satellite system 有权

    公开(公告)号：US10826596B2

    公开(公告)日：2020-11-03

    申请号：US15902784

    申请日：2018-02-22

    申请人： Yash Vasavada ,  Channasandra Ravishankar ,  John Corrigan ,  Gaguk Zakaria ,  Xiaoling Huang

    发明人： Yash Vasavada ,  Channasandra Ravishankar ,  John Corrigan ,  Gaguk Zakaria ,  Xiaoling Huang

    IPC分类号： H04B7/185 ,  H04B7/204 ,  H01Q25/00

    摘要： A system and method for estimating calibration parameters and locating a Calibration Earth Station (CES) is described. The method may be performed offline. The method includes: providing L×M pilot signal measurements in a matrix R from L CESs and the M feed elements, wherein the matrix R comprises a set of channel coefficients c={c1, c2, . . . , cM}, and k={k1, k2, . . . , kL} perturbations; linking a subset of channel coefficients {c1, c2, . . . , cM} using each of the L CESs; and estimating a relative estimate of the k={k1, k2, . . . , kL} pertubations across the L CESs by using each of the L CESs as a bridging element. In the method, the bridging element provides a strong pilot signal for at least two of the L CESs. A set of criteria for determining locations of CESs have been described. A set of desirable properties for the solution set of L CESs have been disclosed. A combination of inner loop and outer loop methods for determining the final set of optimal locations have been described.

    Frequency domain interpolative speech codec system
    7.
    发明授权
    Frequency domain interpolative speech codec system 有权

    公开(公告)号：US06418408B1

    公开(公告)日：2002-07-09

    申请号：US09542792

    申请日：2000-04-04

    申请人： Bangalore R. Udaya Bhaskar ,  Srinivas Nandkumar ,  Kumar Swaminathan ,  Gaguk Zakaria

    发明人： Bangalore R. Udaya Bhaskar ,  Srinivas Nandkumar ,  Kumar Swaminathan ,  Gaguk Zakaria

    IPC分类号： G10L1904

    CPC分类号： G10L19/18 ,  G10L19/005 ,  G10L19/02 ,  G10L19/0204 ,  G10L19/04 ,  G10L19/083 ,  G10L19/09 ,  G10L25/27 ,  G10L25/30 ,  G10L25/78 ,  G10L25/90 ,  G10L2019/0012 ,  G10L2025/783

    摘要： Encoding of prototype waveform components applicable to GeoMobile and Telephony Earth Station (TES) providing improved voice quality enabling a dual-channel mode of operation which permits more users to communicate over the same physical channel. A prototype word (PW) gain is vector quantized using a vector quantizer (VQ) that explicitly populates the codebook by representative steady state and transient vectors of PW gain for tracking the abrupt variations in speech levels during onsets and other non-stationary events, while maintaining the accuracy of the speech level during stationary conditions. The rapidly evolving waveform (REW) and slowly evolving waveform (SEW) component vectors are converted to magnitude-phase. The variable dimension SEW magnitude vector is quantized using a hierarchical approach, i.e., a fixed dimension SEW mean vector computed by a sub-band averaging of SEW magnitude spectrum, and only the REW magnitude is explicitly encoded. The REW magnitude vector sequence is normalized to unity RMS value, resulting in a REW magnitude shape vector and a REW gain vector. The normalized REW magnitude vectors are modeled by a multi-band sub-band model which converts the variable dimension REW magnitude shape vectors, e.g., six dimensional REW sub-band vectors. The sub-band vectors are averaged over time, resulting in a single average REW sub-band vector for each frame. At the decoder, the full-dimension REW magnitude shape vector is obtained from the REW sub-band vector by a piecewise-constant construction. The REW phase vector is regenerated at the decoder based on the received REW gain vector and the voicing measure, which determines a weighted mixture of SEW component and a random noise that is passed through a high pass filter to generate the REW component. The high pass filter poles are adjusted based on the voicing measure to control the REW component characteristics. At the output the filter, the magnitude of the REW component is scaled to match the received REW magnitude vector.