公开(公告)号：US20130044024A2

公开(公告)日：2013-02-21

申请号：US13403532

申请日：2012-02-23

申请人： Yash Vasavada ,  Xiaoling Huang ,  Ambarish Purohit ,  Channasandra Ravishankar ,  John Corrigan, III

发明人： Yash Vasavada ,  Xiaoling Huang ,  Ambarish Purohit ,  Channasandra Ravishankar ,  John Corrigan, III

IPC分类号： H04B7/185 ,  H01Q3/00

CPC分类号： H01Q3/267

摘要： A method for iterative estimation of a set of unknown channel parameters in a beamforming network including determining a first order estimate of offsets at measurement nodes and an estimate of the confidence in the initial estimate of the measurement nodes' offsets, and iterating, until a desired estimation accuracy is obtained, determining an improved estimate of a parameter set, and the confidence in the estimates, using the prior estimate of the offsets at the measurement nodes and determining an improved estimate of the offsets at the measurement nodes and the associated confidence values using the prior estimate of the parameter set and the corresponding confidence values.

摘要翻译： 一种用于迭代估计波束形成网络中的一组未知信道参数的方法，包括确定测量节点处的偏移量的一阶估计，以及对测量节点偏移的初始估计中的置信度的估计，并且迭代，直到所需的 使用在测量节点处的偏移的先前估计来确定参数集合的改进的估计和估计的置信度并且使用以下方法确定测量节点处的偏移的改进的估计和相关联的置信度值： 参数集的先前估计和相应的置信度值。

公开(公告)号：US20120218141A1

公开(公告)日：2012-08-30

申请号：US13403532

申请日：2012-02-23

申请人： Yash Vasavada ,  Xiaoling Huang ,  Ambarish Purohit ,  Channasandra Ravishankar ,  John E. Corrigan, III

发明人： Yash Vasavada ,  Xiaoling Huang ,  Ambarish Purohit ,  Channasandra Ravishankar ,  John E. Corrigan, III

IPC分类号： H04B7/185 ,  H01Q3/00

CPC分类号： H01Q3/267

摘要： A method for iterative estimation of a set of unknown channel parameters in a beamforming network including determining a first order estimate of offsets at measurement nodes and an estimate of the confidence in the initial estimate of the measurement nodes' offsets, and iterating, until a desired estimation accuracy is obtained, determining an improved estimate of a parameter set, and the confidence in the estimates, using the prior estimate of the offsets at the measurement nodes and determining an improved estimate of the offsets at the measurement nodes and the associated confidence values using the prior estimate of the parameter set and the corresponding confidence values.

摘要翻译： 一种用于迭代估计波束形成网络中的一组未知信道参数的方法，包括确定测量节点处的偏移量的一阶估计，以及对测量节点偏移的初始估计中的置信度的估计，并且迭代，直到所需的 使用在测量节点处的偏移的先前估计来确定参数集合的改进的估计和估计的置信度并且使用以下方法确定测量节点处的偏移的改进的估计和相关联的置信度值： 参数集的先前估计和相应的置信度值。

公开(公告)号：US06778509B1

公开(公告)日：2004-08-17

申请号：US09714788

申请日：2000-11-16

申请人： Channasandra Ravishankar ,  Anthony Noerpel ,  Mahesh Kamath ,  Abheek Saha ,  James Hobza

发明人： Channasandra Ravishankar ,  Anthony Noerpel ,  Mahesh Kamath ,  Abheek Saha ,  James Hobza

IPC分类号： H04B7212

CPC分类号： H04B7/18589 ,  H04W8/24 ,  H04W72/0413 ,  H04W72/042 ,  H04W76/10 ,  H04W84/06

摘要： An approach for minimizing response times in transporting traffic over a packet radio communication system is disclosed. A terminal transmits a packet resource request message that specifies user terminal information using a contention channel according to a prescribed protocol. A gateway station receives the packet resource request message and transmits an assignment message that specifies a channel assignment based upon the user terminal information, wherein the terminal is configured to transmit the packets over a channel is based on the channel assignment. This approach has particular applicability to a satellite communication system.

摘要翻译： 公开了一种用于最小化在分组无线电通信系统上传输业务的响应时间的方法。 终端根据规定的协议使用竞争信道发送指定用户终端信息的分组资源请求消息。 网关站接收分组资源请求消息，并且基于用户终端信息发送指定信道分配的分配消息，其中终端被配置为基于信道分配通过信道发送分组。 这种方法特别适用于卫星通信系统。

公开(公告)号：US11588542B2

公开(公告)日：2023-02-21

申请号：US16952657

申请日：2020-11-19

申请人： Channasandra Ravishankar

发明人： Channasandra Ravishankar

IPC分类号： H04B7/155 ,  H04B7/06 ,  H04B7/10 ,  H04B7/185

摘要： A method and system for improving link performance for a user terminal (UT) in a satellite network is disclosed. The method including: providing a first beam servicing a first service area that is adjacent a second service area serviced by a second beam; transmitting, from the first service area, a transmission via the first beam to a receiver via a satellite; beamforming the first beam and the second beam at the receiver; extracting the first beam and a remnant signal of the first beam from the second beam; and processing the first beam and the remnant signal to receive the transmission, wherein the remnant signal may include a portion of the transmission received by a second beam antenna of the satellite.

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.

公开(公告)号：US09088335B2

公开(公告)日：2015-07-21

申请号：US13586561

申请日：2012-08-15

申请人： Je-Hong Jong ,  Jun Xu ,  Channasandra Ravishankar

发明人： Je-Hong Jong ,  Jun Xu ,  Channasandra Ravishankar

IPC分类号： H04B7/185

CPC分类号： H04B7/18513

摘要： Various approaches are introduced to provide link adaptation to maximize the resource utilization of the satellite network: (i) a method to adapt the transmission rate for packet voice and data traffics; (ii) a method to control the transmit power of packet voice and data channels; and (iii) a method to accomplish the feedback loop in a secured and correct manner.

摘要翻译： 引入各种方法以提供链路适应以最大化卫星网络的资源利用率：（i）适应分组语音和数据业务的传输速率的方法; （ii）控制分组话音和数据信道的发射功率的方法; 和（iii）以安全和正确的方式完成反馈回路的方法。

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。

公开(公告)号：US20120146849A1

公开(公告)日：2012-06-14

申请号：US13326209

申请日：2011-12-14

申请人： Jun Xu ,  Yash Vasavada ,  Mike Parr ,  Channasandra Ravishankar ,  Anthony Noerpel ,  Je-Hong Jong

发明人： Jun Xu ,  Yash Vasavada ,  Mike Parr ,  Channasandra Ravishankar ,  Anthony Noerpel ,  Je-Hong Jong

IPC分类号： G01S19/46 ,  G01S19/12

CPC分类号： G01S19/05 ,  G01S19/258 ,  G01S19/27 ,  G01S19/33

摘要： An approach provides for conversion of global positioning system (GPS) data. A user terminal receives positioning data from a base station, wherein the positioning data is received in a second format, and wherein the second format was derived from ephemeris data broadcast via a global positioning system (GPS) in a first format. The user terminal converts the positioning data from the second format into a third format that is compatible with a protocol of the GPS system, and determines a first fix using the third format of the positioning data.

摘要翻译： 一种方法提供了全球定位系统（GPS）数据的转换。 用户终端从基站接收定位数据，其中以第二格式接收定位数据，并且其中第二格式是通过第一格式的全球定位系统（GPS）从星历数据广播导出的。 用户终端将来自第二格式的定位数据转换为与GPS系统的协议兼容的第三格式，并且使用定位数据的第三格式确定第一固定。

公开(公告)号：US06650895B1

公开(公告)日：2003-11-18

申请号：US09447696

申请日：1999-11-23

申请人： Channasandra Ravishankar ,  David Roos ,  Anthony Noerpel ,  Chandra Joshi ,  James Hobza ,  Prabir Datta ,  Yi Chen

发明人： Channasandra Ravishankar ,  David Roos ,  Anthony Noerpel ,  Chandra Joshi ,  James Hobza ,  Prabir Datta ,  Yi Chen

IPC分类号： H04Q720

CPC分类号： H04B7/19 ,  H04M3/2281 ,  H04M3/533 ,  H04Q1/45

摘要： A system and a methodology to improve the end-user quality of service both in terms of response time and reliability for the transport of in-call DTMF signals in wireless systems, particularly in geostationary mobile satellite systems. The methodology encompasses several techniques to provide acceptable end-to-end quality of service for DTMF. A technique is applicable for transport of DTMF in the wireless subscriber to network direction, where DTMF digits are carried in the form of an out-band message. The central part of the technique is to allow multiple key presses in the same message, thereby increasing efficiency and throughput in long-delay environment. Another technique utilizes the vocoder's functionality to carry DTMF in-band, thereby reducing system complexity. The scheme makes the use of an integrated DTMF detector which can classify a given frame of signal into several classes so that the DTMF encoded packet can carry a unique pattern across the air-interface to the voice decoder at AT, which is capable of identifying the pattern. Another technique pertains to the use of a message based DTMF transport between two-ATs on a separate logical channel with a unique Service Access point Identifier (SAPI) providing guaranteed service for DTMF transport in an AT-AT call.

摘要翻译： 在无线系统，特别是对地静止移动卫星系统中，在无线系统中传输呼叫中的DTMF信号的响应时间和可靠性方面，提高最终用户服务质量的系统和方法。 该方法包括几种为DTMF提供可接受的端到端服务质量的技术。 一种技术适用于将无线用户中的DTMF传输到网络方向，其中DTMF数字以带外消息的形式携带。 该技术的核心部分是允许同一消息中的多个按键按压，从而在长时间延迟环境中提高效率和吞吐量。 另一种技术利用声码器的功能来携带DTMF带内，从而降低系统的复杂性。 该方案使用集成的DTMF检测器，其可以将给定的信号帧分类成多个等级，使得DTMF编码的分组可以在AT的语音解码器的空中接口上携带唯一的模式，其能够识别 模式。 另一种技术涉及在独立的逻辑信道上的两个AT之间使用基于消息的DTMF传输与唯一的服务接入点标识符（SAPI），其在AT-AT呼叫中为DTMF传输提供有保证的服务。