公开(公告)号：US07724664B2

公开(公告)日：2010-05-25

申请号：US10478373

申请日：2002-06-14

申请人： John L Adams ,  Avril J Smith

发明人： John L Adams ,  Avril J Smith

IPC分类号： G08C15/00

CPC分类号： H04L47/10 ,  H04L47/12 ,  H04L47/31 ,  H04L47/323

摘要： A packet network node and method of operating a packet network node are disclosed. Conventional packet network nodes react to congestion in the packet network by dropping packets in a manner which is perceived by users to be indiscriminate. In embodiments of the present invention, communication sources precede communications with a start packet which contains a communication identifier also carried within subsequent packets of the communication. The packet network node makes an entry in a vulnerable communications table (6.4) on receipt of such a start packet. After an amount of time, and often before the cessation of a communication, such entries are removed from the vulnerable communications table. On the onset of congestion, the packet network node disclosed herein deletes packets in communications identified in the vulnerable communications table. This provides a congestion alleviation method which is less annoying to users since communications that have been in existence for longer are less susceptible to component packets being deleted.

摘要翻译： 公开了分组网络节点和操作分组网络节点的方法。 传统的分组网络节点通过以用户不感兴趣的方式丢弃分组来分组分组网络中的拥塞。 在本发明的实施例中，通信源在与包含通信标识符的起始分组通信之前，该起始分组还包括在通信的后续分组内也携带的通信标识符。 分组网络节点在接收到这样的开始分组时，在易受攻击的通信表中进行输入（6.4）。 经过一段时间后，通常在停止通信之前，这些条目将从易受攻击的通信表中删除。 在拥塞开始时，本文公开的分组网络节点删除在脆弱通信表中标识的通信中的分组。 这提供了一种对用户来说不那么恼人的拥塞减轻方法，因为已经存在更长时间的通信不太容易被组件分组删除。

公开(公告)号：US07035211B1

公开(公告)日：2006-04-25

申请号：US08983268

申请日：1997-09-10

申请人： Avril J. Smith ,  John L. Adams

发明人： Avril J. Smith ,  John L. Adams

IPC分类号： G01R31/08

CPC分类号： H04L12/5602 ,  H04L2012/5615 ,  H04L2012/563 ,  H04L2012/5632 ,  H04L2012/5635 ,  H04L2012/5636 ,  H04L2012/5638 ,  H04L2012/5639 ,  H04Q11/0478

摘要： In a broadband switching system for the switching of asynchronously transferred cells of data, a dynamic bandwidth controller (DBC) controls the application of data cells at an input port of the system, the data cells being supplied by a number of transmitting end-stations. The DBC detects incoming cells, identifies the source of the cells, provides buffering for the cells, and controls the output of the cells to the system switches according to a current cell rate (CR) assigned to the cells from the respective source. The system also includes a connection admission (CAC) module which determines bandwidth available in the system. The DBC and CAC operate together to maintain a permanent virtual path of a predetermined minimum bandwidth through the system and allocate additional bandwidth on demand up to a maximum. The additional bandwidth allocated to the path can be automatically removed or reduced of it is not used by the source. Feedback to the source can be provided to prevent cells being supplied at a rate which would result in significant cell loss due to the limitation of bandwidth available for the path in the system.

摘要翻译： 在用于切换异步传输的数据单元的宽带交换系统中，动态带宽控制器（DBC）控制在系统的输入端口处的数据单元的应用，数据单元由多个发送端站提供。 DBC检测传入的单元，识别单元的源，为单元提供缓冲，并根据从相应源分配给单元的当前单元速率（CR）来控制单元到系统开关的输出。 该系统还包括确定系统中可用带宽的连接准入（CAC）模块。 DBC和CAC一起运行，以通过系统维持预定最小带宽的永久虚拟路径，并根据需求分配额外的带宽，直到最大值。 分配给路径的额外带宽可以自动删除或减少，不会被源使用。 可以提供对源的反馈以防止以由于系统中的路径可用的带宽的限制而导致显着的信元丢失的速率提供信元。

公开(公告)号：US06452905B1

公开(公告)日：2002-09-17

申请号：US08913270

申请日：1998-05-04

申请人： Avril J Smith ,  John L Adams

发明人： Avril J Smith ,  John L Adams

IPC分类号： H04J316

CPC分类号： H04L12/5602 ,  H04L2012/5615 ,  H04L2012/5632 ,  H04L2012/5635 ,  H04L2012/5636 ,  H04L2012/5639 ,  H04L2012/5649 ,  H04Q11/0478

摘要： In a broadband switching system for the switching of asynchronously transferred cells of data, a dynamic bandwidth controller (DBC) controls the application of data cells to an input port of the system. The data cells are supplied by a number of transmitting end-systems. When an end-system begins transmitting data cells, the DBC detects the presence of incoming cells and requests bandwidth from a connection admission control (CAC) forming part of the system. The switching system stores a table associating a number of signal sources connected to the input port with respective predetermined maximum transmission times and maximum transmission rates for the sources. When arrival of cells at the input port from one of the source is detected, the DBC and CAC operate together to allocate sufficient bandwidth in the switching system to allow the respective message size to be transmitted within the respective maximum transmission time. A guaranteed minimum rate of transmission is also guaranteed for the source.

摘要翻译： 在用于切换异步传输的数据单元的宽带交换系统中，动态带宽控制器（DBC）控制数据信元到系统的输入端口的应用。 数据信元由许多发送端系统提供。 当终端系统开始发送数据单元时，DBC检测入站单元的存在，并从构成系统一部分的连接许可控制（CAC）请求带宽。 切换系统存储将连接到输入端口的信号源的数量与各个预定的最大传输时间和源的最大传输速率相关联的表格。 当检测到来自一个源的信元到达输入端口时，DBC和CAC一起工作以在交换系统中分配足够的带宽，以允许相应的最大传输时间内发送相应的消息大小。 保证最低传输速率也能得到保证。

公开(公告)号：US06222823B1

公开(公告)日：2001-04-24

申请号：US08999749

申请日：1997-09-10

申请人： Avril J. Smith ,  John L. Adams

发明人： Avril J. Smith ,  John L. Adams

IPC分类号： G06F1100

CPC分类号： H04L12/5602 ,  H04L2012/5615 ,  H04L2012/563 ,  H04L2012/5632 ,  H04L2012/5635 ,  H04L2012/5636 ,  H04L2012/5639 ,  H04L2012/5651 ,  H04Q11/0478

摘要： In a broadband switching system for the switching of asynchronously transferred cells of data, a dynamic bandwidth controller (DBC) controls the application of data cells to an input port of the system. Data cells are supplied by a number of transmitting end-systems. When an end-system begins transmitting data cells, the DBC detects the presence of incoming cells and requests bandwidth from a connection admission control (CAC) forming part of the system. The switching system stores a table associating a number of signal sources connected to the ingress with respective predetermined transmission bandwidths and, preferably also, maximum delay times. When arrival of cells from one of the sources at the input port is detected, the DBC sends a request signal for the relevant predetermined bandwidth to the CAC and delays transmission of the cells until at least the predetermined bandwidth is allocated. This delay is typically effected by sending a cell rate indicator signal back to the input port for placing the source in a halt mode. If no allocation of bandwidth has occurred before the respective maximum delay time, bandwidth is allocated by robbing bandwidth form other signal sources.

摘要翻译： 在用于切换异步传输的数据单元的宽带交换系统中，动态带宽控制器（DBC）控制数据信元到系统的输入端口的应用。 数据信元由许多发送终端系统提供。 当终端系统开始发送数据单元时，DBC检测入站单元的存在，并从构成系统一部分的连接许可控制（CAC）请求带宽。 交换系统存储将连接到入口的多个信号源与相应的预定传输带宽相关联的表，并且还优选地存储最大延迟时间。 当检测到来自输入端口中的一个源的小区到达时，DBC向CAC发送针对相关预定带宽的请求信号，并延迟小区的传输，直到分配了至少预定带宽。 通常通过将单元速率指示符信号发送回输入端口以使源处于停止模式来实现该延迟。 如果在相应的最大延迟时间之前没有发生带宽分配，则通过从其他信号源抢夺带宽来分配带宽。