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51. 发明授权

US4979174A Error correction and detection apparatus and method 失效
标题翻译：纠错及检测装置及方法
公开(公告)号：US4979174A
公开(公告)日：1990-12-18
申请号：US291900
申请日：1988-12-29
申请人： Ying Cheng , Subrahmanyam Dravida
发明人： Ying Cheng , Subrahmanyam Dravida
IPC分类号： H03M13/05 , H04L1/00
CPC分类号： H04L1/004 , H03M13/05
摘要： A decoder is arranged to operate as a single-bit error correction circuit (ECC) and as a multiple-bit error detection circuit (EDC). The decoder starts and remains in the ECC state as long as no errors are detected in a received data message. When an error is detected or corrected in a received data message, the decoder switches to the EDC state where it remains as long as errors are detected in the received data message. When no errors are detected in the received data message, the decoder switches back to the ECC state. In a generalized multistate decoder, switching occurs from one state to another state, each state having a different error correcting capability, in response to a predetermined number of errors corrected or detected in the received data.
摘要翻译：解码器被设置为作为单位错误校正电路（ECC）和作为多位错误检测电路（EDC）来操作。只要在接收的数据消息中没有检测到错误，解码器就启动并保持在ECC状态。当在接收到的数据消息中检测到或纠正错误时，解码器切换到EDC状态，只要在接收的数据消息中检测到错误就保持该状态。当接收到的数据消息中没有检测到错误时，解码器切换回ECC状态。在广义多状态解码器中，响应于在接收数据中校正或检测到的预定数量的错误，切换从一种状态发生到另一状态，每种状态具有不同的纠错能力。

52. 再颁专利

USRE40923E1 Simplified data link protocol processor 有权
标题翻译：简化数据链路协议处理器
公开(公告)号：USRE40923E1
公开(公告)日：2009-09-29
申请号：US10417013
申请日：2003-04-16
申请人： Jon Anderson , Bharat Tarachand Doshi , Subrahmanyam Dravida , Enrique Hernandez-Valencia , Murali Krishnaswamy , James S. Manchester
发明人： Jon Anderson , Bharat Tarachand Doshi , Subrahmanyam Dravida , Enrique Hernandez-Valencia , Murali Krishnaswamy , James S. Manchester
IPC分类号： G06F11/14
CPC分类号： H04J3/1617 , H04J3/0623 , H04J2203/0076 , H04J2203/0083 , H04J2203/0089 , H04L25/03828 , H04L29/06
摘要： A simplified data link protocol which may be implemented in a very high-speed transmission system, e.g., SONET, processes a datagram received from an IP facility according to QoS considerations and scrambles a datagram before it is again scrambled by a transmission system, e.g., a SONET transmitter, to ensure that the pattern of a user's data does not match the transmission scrambling pattern. The data link protocol scrambler also employs a novel synchronization scheme. We also use a pointer system which identifies the location of a datagram in a frame to eliminate flags and the need to process user data to ensure that it does not contain and a boundary flag.
摘要翻译：可以在非常高速的传输系统（例如SONET）中实现的简化的数据链路协议根据QoS考虑处理从IP设施接收的数据报，并且在数据报再次被传输系统加扰之前进行加扰，例如， SONET发射机，以确保用户数据的模式与传输加扰模式不匹配。数据链路协议扰码器还采用新颖的同步方案。我们还使用一个指针系统来标识帧中数据报的位置，以消除标志，并且需要处理用户数据以确保不包含边界标志。

53. 发明申请

US20080056130A1 System and method for mapping end user identifiers to access device identifiers 有权
标题翻译：用于将最终用户标识符映射到访问设备标识符的系统和方法
公开(公告)号：US20080056130A1
公开(公告)日：2008-03-06
申请号：US11894750
申请日：2007-08-20
申请人： Gautam Desai , Subrahmanyam Dravida , Satya Gupta , Kiran Rege , Manas Tandon , Ravi Kumar , DeQuan Wu
发明人： Gautam Desai , Subrahmanyam Dravida , Satya Gupta , Kiran Rege , Manas Tandon , Ravi Kumar , DeQuan Wu
IPC分类号： G01R31/08
CPC分类号： H04L61/2015 , H04L12/2801 , H04L12/2856 , H04L12/2859 , H04L12/4641 , H04L29/12216 , H04L41/0803 , H04L41/0886 , H04L41/12 , H04L41/5003 , H04L43/12 , H04L47/10 , H04L47/15 , H04L47/20 , H04L47/215 , H04L47/24 , H04L47/2416 , H04L47/2425 , H04L47/2433 , H04L47/2441 , H04L47/2491 , H04L47/32 , H04L47/50 , H04L47/521 , H04L47/6225 , H04L47/623 , H04L47/70 , H04L47/724 , H04L47/788 , H04L47/801 , H04L47/805 , H04L47/822 , H04L47/829 , H04L2012/5605 , H04L2012/5606 , H04L2012/561 , H04L2012/5651 , H04L2012/5679 , H04N7/10 , H04N7/17309 , H04N21/6118 , H04N21/6168 , H04N21/6402 , H04Q3/0045
摘要： Hybrid fiber/coax networks employ the existing cable plant used for cable TV and transmit data signals in a frequency bandwidth above that which is used for cable TV. As this cable plant was deployed in a tree and branch topology, data transmissions may be susceptible to noise, variable transmission loss and frequency dispersion, particularly in the upstream direction. Further, due to the tree and branch topology, homes at the far end of the network experience much greater loss than do the homes that are near to the headend/ONU. The present system, which uses point-to-point data links between intelligent network elements located in the feeder/distribution network to provide reliable, secure, bi-directional broadband access. Digital signals, or messages, are terminated at the intelligent network elements, switched and regenerated for transmission across additional upstream or downstream data links as needed to connect a home to a headend or router. Messages indicative of an end user routing ID (RID) are identified and the information extracted for user with successive messages. In this manner, the data links are made over relatively short runs of coax cable, which can provide greater bandwidth than the typical end-to-end feeder/distribution connection between a home and the headend or optical network unit.
摘要翻译：混合光纤/同轴电缆网络采用用于有线电视的现有电缆设备，并以高于用于有线电视的频率带宽传输数据信号。由于该电缆厂部署在树型和分支拓扑结构中，数据传输可能会受到噪声，可变传输损耗和频率分散的影响，特别是在上行方向。此外，由于树和分支拓扑，网络远端的家庭比靠近头端/ ONU的家庭遭受更大的损失。该系统使用位于馈线/分配网络中的智能网络元件之间的点对点数据链路来提供可靠，安全的双向宽带接入。数字信号或消息在智能网络元件处被终止，被切换和重新生成，以便在将家庭连接到头端或路由器所需的附加上游或下游数据链路上传输。识别指示最终用户路由ID（RID）的消息，并且为具有连续消息的用户提取信息。以这种方式，数据链路通过相对短的同轴电缆运行进行，这可以提供比归属和前端或光网络单元之间的典型端到端馈线/分配连接更大的带宽。

54. 发明申请

US20060276227A1 Multi-antenna station with distributed antennas 有权
公开(公告)号：US20060276227A1
公开(公告)日：2006-12-07
申请号：US11144994
申请日：2005-06-02
申请人： Subrahmanyam Dravida
发明人： Subrahmanyam Dravida
IPC分类号： H04B1/02 , H04M1/00 , H04B7/02
CPC分类号： H04B7/0691 , H04B7/0413 , H04W48/20 , H04W88/085
摘要： A multi-antenna station with distributed antennas and capable of providing good performance for terminals distributed throughout the coverage area of the multi-antenna station is described. The multi-antenna station includes multiple antennas, a controller, and at least one transmitter unit. The multiple antennas are coupled to the multi-antenna station and include at least one remote antenna that is located away from the multi-antenna station. The controller selects a set of one or more antennas from among the multiple antennas for data transmission to a terminal. The at least one transmitter unit transmits data to the terminal via the set of one or more antennas.

55. 发明授权

US06948000B2 System and method for mapping end user identifiers to access device identifiers 有权
标题翻译：用于将最终用户标识符映射到访问设备标识符的系统和方法
公开(公告)号：US06948000B2
公开(公告)日：2005-09-20
申请号：US09952480
申请日：2001-09-13
申请人： Gautam Desai , Subrahmanyam Dravida , Satya V. Gupta , Kiran M. Rege , Manas Tandon , Ravi S. Kumar , DeQuan Wu
发明人： Gautam Desai , Subrahmanyam Dravida , Satya V. Gupta , Kiran M. Rege , Manas Tandon , Ravi S. Kumar , DeQuan Wu
IPC分类号： H04L12/24 , H04L12/28 , H04L12/46 , H04L12/56 , H04L29/12 , H04N7/10 , H04N7/173 , H04N21/61 , H04N21/6402 , H04Q3/00 , G06F15/16
CPC分类号： H04L61/2015 , H04L12/2801 , H04L12/2856 , H04L12/2859 , H04L12/4641 , H04L29/12216 , H04L41/0803 , H04L41/0886 , H04L41/12 , H04L41/5003 , H04L43/12 , H04L47/10 , H04L47/15 , H04L47/20 , H04L47/215 , H04L47/24 , H04L47/2416 , H04L47/2425 , H04L47/2433 , H04L47/2441 , H04L47/2491 , H04L47/32 , H04L47/50 , H04L47/521 , H04L47/6225 , H04L47/623 , H04L47/70 , H04L47/724 , H04L47/788 , H04L47/801 , H04L47/805 , H04L47/822 , H04L47/829 , H04L2012/5605 , H04L2012/5606 , H04L2012/561 , H04L2012/5651 , H04L2012/5679 , H04N7/10 , H04N7/17309 , H04N21/6118 , H04N21/6168 , H04N21/6402 , H04Q3/0045
摘要： Hybrid fiber/coax networks employ the existing cable plant used for cable TV and transmit data signals in a frequency bandwidth above that which is used for cable TV. As this cable plant was deployed in a tree and branch topology, data transmissions may be susceptible to noise, variable transmission loss and frequency dispersion, particularly in the upstream direction. Further, due to the tree and branch topology, homes at the far end of the network experience much greater loss than do the homes that are near to the headend/ONU. The present system, which uses point-to-point data links between intelligent network elements located in the feeder/distribution network to provide reliable, secure, bi-directional broadband access. Digital signals, or messages, are terminated at the intelligent network elements, switched and regenerated for transmission across additional upstream or downstream data links as needed to connect a home to a headend or router. Messages indicative of an end user routing ID (RID) are identified and the information extracted for user with successive messages. In this manner, the data links are made over relatively short runs of coax cable, which can provide greater bandwidth than the typical end-to-end feeder/distribution connection between a home and the headend or optical network unit.
摘要翻译：混合光纤/同轴电缆网络采用用于有线电视的现有电缆设备，并以高于用于有线电视的频率带宽传输数据信号。由于该电缆厂部署在树型和分支拓扑结构中，数据传输可能会受到噪声，可变传输损耗和频率分散的影响，特别是在上行方向。此外，由于树和分支拓扑，网络远端的家庭比靠近头端/ ONU的家庭遭受更大的损失。该系统使用位于馈线/分配网络中的智能网络元件之间的点对点数据链路来提供可靠，安全的双向宽带接入。数字信号或消息在智能网络元件处被终止，被切换和重新生成，以便在将家庭连接到头端或路由器所需的附加上游或下游数据链路上传输。识别指示最终用户路由ID（RID）的消息，并且为具有连续消息的用户提取信息。以这种方式，数据链路通过相对较短的同轴电缆运行进行，这可以提供比归属和前端或光网络单元之间的典型端到端馈线/分配连接更大的带宽。

56. 发明授权

US06947398B1 Addressing scheme for a multimedia mobile network 有权
标题翻译：多媒体移动网络的寻址方案
公开(公告)号：US06947398B1
公开(公告)日：2005-09-20
申请号：US09191132
申请日：1998-11-13
申请人： Walid Ahmed , Bharat Tarachand Doshi , Subrahmanyam Dravida , Hong Jiang , Kiran M. Rege
发明人： Walid Ahmed , Bharat Tarachand Doshi , Subrahmanyam Dravida , Hong Jiang , Kiran M. Rege
IPC分类号： H04W8/04 , H04W8/26 , H04W80/04 , H04Q7/00
CPC分类号： H04W8/04 , H04W8/26 , H04W80/04
摘要： An addressing scheme for a packet-based multiaccess mobile communications system, which includes a plurality of mobile user stations and a plurality of network nodes, is provided. In such addressing scheme, each mobile station is assigned an address which is a combination (preferably, a concatenation) of a unique identifier of a network node with which the mobile station is currently associated and an identifier of the mobile station. The network node identifiers may be uniquely assigned by a network administrator, while the identifiers of the mobile stations may, for example, be set to a universal MAC address assigned to the station. The address may also include a port identifier which indicates the particular application flow associated with the accompanying packets. Similarly, each network node is assigned an address which is a combination (preferably, a concatenation) of its network node identifier and, preferably, an interface identifier. The address may also include a port identifier.
摘要翻译：提供了一种用于基于分组的多接入移动通信系统的寻址方案，其包括多个移动用户站和多个网络节点。在这种寻址方案中，每个移动台被分配地址，该地址是移动台当前与之相关联的网络节点的唯一标识符和移动站的标识符的组合（优选地，级联）。网络节点标识符可以由网络管理员唯一地分配，而移动站的标识符可以例如被设置为分配给站的通用MAC地址。地址还可以包括指示与伴随的分组相关联的特定应用流的端口标识符。类似地，为每个网络节点分配一个地址，该地址是其网络节点标识符的组合（优选地，连接），并且优选地，接口标识符。地址还可以包括端口标识符。

57. 发明授权

US06263443B1 Simplified data link protocol processor 失效
标题翻译：简化数据链路协议处理器
公开(公告)号：US06263443B1
公开(公告)日：2001-07-17
申请号：US08947538
申请日：1997-10-11
申请人： Jon Anderson , Bharat Tarachand Doshi , Subrahmanyam Dravida , Enrique Hernandez-Valencia , Murali Krishnaswamy , James S. Manchester
发明人： Jon Anderson , Bharat Tarachand Doshi , Subrahmanyam Dravida , Enrique Hernandez-Valencia , Murali Krishnaswamy , James S. Manchester
IPC分类号： G06F1114
CPC分类号： H04J3/1617 , H04J3/0623 , H04J2203/0076 , H04J2203/0083 , H04J2203/0089 , H04L25/03828 , H04L29/06
摘要： A simplified data link protocol which may be implemented in a very high-speed transmission system, e.g., SONET, processes a datagram received from an IP facility according to QoS considerations and scrambles a datagram before it is again scrambled by a transmission system, e.g., a SONET transmitter, to ensure that the pattern of a user's data does not match the transmission scrambling pattern. The data link protocol scrambler also employs a novel synchronization scheme. We also use a pointer system which identifies the location of a datagram in a frame to eliminate flags and the need to process user data to ensure that it does not contain and a boundary flag.
摘要翻译：可以在非常高速的传输系统（例如SONET）中实现的简化的数据链路协议根据QoS考虑处理从IP设施接收的数据报，并且在数据报再次被传输系统加扰之前进行加扰，例如， SONET发射机，以确保用户数据的模式与传输加扰模式不匹配。数据链路协议扰码器还采用新颖的同步方案。我们还使用一个指针系统来标识帧中数据报的位置，以消除标志，并且需要处理用户数据以确保不包含边界标志。

58. 发明授权

US06240463B1 Router placement methods and apparatus for designing IP networks with performance guarantees 失效
标题翻译：用于设计具有性能保证的IP网络的路由器布局方法和设备
公开(公告)号：US06240463B1
公开(公告)日：2001-05-29
申请号：US09198729
申请日：1998-11-24
申请人： Lotfi Benmohamed , Subrahmanyam Dravida , Paramasiviah Harshavardhana , Wing Cheong Lau , Ajay Kumar Mittal
发明人： Lotfi Benmohamed , Subrahmanyam Dravida , Paramasiviah Harshavardhana , Wing Cheong Lau , Ajay Kumar Mittal
IPC分类号： G06F15173
CPC分类号： H04L41/5025 , H04L41/0823 , H04L41/145 , H04L41/5003 , H04L45/00
摘要： Methods and apparatus are provided for designing IP networks with substantially improved performance as compared to existing IP networks such as, for example, those networks designed under best-effort criteria. Particularly, the invention includes methods and apparatus for: computing worst-case and optimistic link capacity requirements; optimizing network topology; and determining router placement within a network.
摘要翻译：提供了与现有IP网络（例如，以尽力而为标准设计的那些网络）相比，用于设计具有显着改善的性能的IP网络的方法和装置。特别地，本发明包括用于：计算最坏情况和乐观链路能力要求的方法和装置; 优化网络拓扑; 并确定网络中的路由器布局。

59. 发明授权

US06215763B1 Multi-phase process for distributed precomputation of network signal paths 失效
标题翻译：网络信号路径分布式预计算的多阶段过程
公开(公告)号：US06215763B1
公开(公告)日：2001-04-10
申请号：US08960463
申请日：1997-10-29
申请人： Bharat Tarachand Doshi , Subrahmanyam Dravida , Paramasiviah Harshavardhana , Yufei Wang
发明人： Bharat Tarachand Doshi , Subrahmanyam Dravida , Paramasiviah Harshavardhana , Yufei Wang
IPC分类号： G01R3108
CPC分类号： H04J14/0227 , H04J14/0241 , H04J14/0278 , H04J14/0284 , H04Q11/0005 , H04Q2011/005 , H04Q2011/0081
摘要： Distributed precomputation techniques for determining primary and/or restoration paths in an optical or electrical network. The invention provides a number of partially and fully asynchronous distributed precomputation algorithms which may be implemented, for example, by the nodes of an all-optical network, in which network links are constrained in terms of optical signal wavelength and failure isolation. A given distributed precomputation algorithm may include a first phase in which paths are allocated for capacity demands to the extent possible without resolving contentions, and a second phase in which contentions between demands for the same capacity are resolved. The first phase may implement a contention locking mechanism which locks a primary path of a given demand to prevent other demands from contending for the same capacity, and a link capacity control mechanism which involves storing a link status table at one or more nodes, the link status table listing a number of specific failures and demands which are affected by the failures. The second phase of the distributed precomputation algorithm reroutes paths previously allocated to one or more demands in order to free up capacity required for another demand, so as to optimize overall network capacity utilization.
摘要翻译：用于确定光或电网络中的主路径和/或恢复路径的分布式预计算技术。本发明提供了许多部分和完全异步的分布式预计算算法，其可以例如由全光网络的节点来实现，其中网络链路在光信号波长和故障隔离方面受到约束。给定的分布式预计算算法可以包括第一阶段，在第一阶段中，在不解决争用的情况下尽可能地分配用于容量需求的路径，以及解决相同容量的需求之间的争用的第二阶段。第一阶段可以实施争用锁定机制，其锁定给定需求的主要路径以防止其他需求竞争相同的容量;以及链路容量控制机制，其涉及将链路状态表存储在一个或多个节点处，所述链路状态表列出了受到故障影响的一些具体故障和需求。分布式预先计算算法的第二阶段重新路由先前分配给一个或多个需求的路径，以便释放另一个需求所需的容量，从而优化整体网络容量利用率。

60. 发明授权

US06205117B1 Distributed precomputation of network signal paths with table-based link capacity control 有权
标题翻译：基于表的链路容量控制的网络信号路径的分布式预计算
公开(公告)号：US06205117B1
公开(公告)日：2001-03-20
申请号：US09448266
申请日：1999-11-24
申请人： Bharat Tarachand Doshi , Subrahmanyam Dravida , Paramasiviah Harshavardhana , Yufei Wang
发明人： Bharat Tarachand Doshi , Subrahmanyam Dravida , Paramasiviah Harshavardhana , Yufei Wang
IPC分类号： G01R3108
CPC分类号： H04Q11/0005 , H04J14/0227 , H04J14/0241 , H04J14/0284 , H04Q2011/005 , H04Q2011/0081
摘要： Distributed precomputation techniques for determining primary and/or restoration paths in an optical or electrical network. The invention provides a number of partially and fully asynchronous distributed precomputation algorithms which may be implemented, for example, by the nodes of an all-optical network, in which network links are constrained in terms of optical signal wavelength and failure isolation. A given distributed precomputation algorithm may include a first phase in which paths are allocated for capacity demands to the extent possible without resolving contentions, and a second phase in which contentions between demands for the same capacity are resolved. The first phase may implement a contention locking mechanism which locks a primary path of a given demand to prevent other demands from contending for the same capacity, and a link capacity control mechanism which involves storing a link status table at one or more nodes, the link status table listing a number of specific failures and demands which are affected by the failures. The second phase of the distributed precomputation algorithm reroutes paths previously allocated to one or more demands in order to free up capacity required for another demand, so as to optimize overall network capacity utilization.
摘要翻译：用于确定光或电网络中的主路径和/或恢复路径的分布式预计算技术。本发明提供了许多部分和完全异步的分布式预计算算法，其可以例如由全光网络的节点来实现，其中网络链路在光信号波长和故障隔离方面受到约束。给定的分布式预计算算法可以包括第一阶段，在第一阶段中，在不解决争用的情况下尽可能地分配用于容量需求的路径，以及解决相同容量的需求之间的争用的第二阶段。第一阶段可以实施争用锁定机制，其锁定给定需求的主要路径以防止其他需求竞争相同的容量;以及链路容量控制机制，其涉及将链路状态表存储在一个或多个节点处，所述链路状态表列出了受到故障影响的一些具体故障和需求。分布式预先计算算法的第二阶段重新路由先前分配给一个或多个需求的路径，以便释放另一个需求所需的容量，从而优化整体网络容量利用率。

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