公开(公告)号：EP1719327A1

公开(公告)日：2006-11-08

申请号：EP05708423.8

申请日：2005-02-23

申请人： BAE Systems PLC

发明人： WRAY, Stuart Charles

IPC分类号： H04L29/06

CPC分类号： H04L63/0428 ,  H04L63/105 ,  H04L63/123 ,  H04L63/166

摘要： A method of improving the security of computer communications over a connecting network comprising the steps, carried out before a data packet enters the connecting network from a user domain, of tagging the data packet from a user domain with a security level marking and appending the tagged data packet with a string formed from a check-sum made over the data packet and security level marking tag to form a datagram. The integrity of the data is protected and the method can be used to prevent the mis-routing of data packets to user domains of lower security classification.

公开(公告)号：EP1721422B1

公开(公告)日：2008-01-23

申请号：EP05708474.1

申请日：2005-02-25

申请人： BAE Systems PLC

发明人： WRAY, Stuart Charles ,  JONES, Clive Ellis ,  JENNER, Stephen Matthew ,  SALTER, Robert John

IPC分类号： H04L12/56 ,  H04L29/06

CPC分类号： H04L12/56 ,  H04L29/06027 ,  H04L43/0835 ,  H04L65/1069 ,  H04L65/80

摘要： Described herein is a method of controlling calls for packet switched networks, each network including at least two local area networks (50, 60) and a connecting network (70). The method comprises the steps of determining an 5 acceptable packet loss rate for a call to be established between two of the local area networks, comparing actual packet loss rate to the acceptable packet loss rate, and dropping the call if the actual packet loss rate is greater than the acceptable packet loss rate. determining for how long a period the actual packet loss rate has been happening and utilising that period in deciding to drop the call. A recorded announcement may be played when the call is to be dropped. Alternatively, the priority of the transmission of the continuous stream of data can be changed when the actual packet loss rate is not acceptable and the above steps are repeated. Ideally, data relating to dropped calls is stored for future one.

公开(公告)号：EP1721422A1

公开(公告)日：2006-11-15

申请号：EP05708474.1

申请日：2005-02-25

申请人： BAE Systems PLC

发明人： WRAY, Stuart Charles ,  JONES, Clive Ellis ,  JENNER, Stephen Matthew ,  SALTER, Robert John

IPC分类号： H04L12/56 ,  H04L29/06

CPC分类号： H04L12/56 ,  H04L29/06027 ,  H04L43/0835 ,  H04L65/1069 ,  H04L65/80

摘要： Described herein is a method of controlling calls for packet switched networks, each network including at least two local area networks (50, 60) and a connecting network (70). The method comprises the steps of determining an 5 acceptable packet loss rate for a call to be established between two of the local area networks, comparing actual packet loss rate to the acceptable packet loss rate, and dropping the call if the actual packet loss rate is greater than the acceptable packet loss rate. determining for how long a period the actual packet loss rate has been happening and utilising that period in deciding to drop the call. A recorded announcement may be played when the call is to be dropped. Alternatively, the priority of the transmission of the continuous stream of data can be changed when the actual packet loss rate is not acceptable and the above steps are repeated. Ideally, data relating to dropped calls is stored for future one.

公开(公告)号：EP1721430B1

公开(公告)日：2011-02-09

申请号：EP05708473.3

申请日：2005-02-25

申请人： BAE Systems PLC

发明人： WRAY, Stuart Charles ,  JONES, Clive Ellis ,  JENNER, Stephen, Matthew ,  SALTER, Robert, John

IPC分类号： H04L12/64

CPC分类号： H04L47/15 ,  H04L29/06027 ,  H04L47/70 ,  H04L47/762 ,  H04L47/801 ,  H04L47/822 ,  H04L65/1069 ,  H04L2012/6445 ,  H04L2012/6486

摘要： Described herein is a method of controlling call admission for packet switched networks, each network including at least two local area networks (50, 60) and a connecting network (70). The method comprises transmitting a burst 5 of trial data of the same size as the packet to be transmitted from a first node (52, 54) in a first local area network (50) to a second node (62, 64) in a second local area network (60) via the connecting network (70). The connecting network (70) comprises a plurality of routing nodes (72, 74, 76, 78, 80) for routing the burst of trial data of the same size as the packet to be transmitted from a first node (52, 54) in a first local area network (50) to second node (62, 64) in a second local area network (60) via the connecting network (70). The connecting network (70) comprises a plurality of routing nodes (72, 74, 76, 78, 80) for routing the burst of trial data to the second node in the second local area network along a particular path. The burst of trial data is reflected by the second node in the second local area network (60) back through the connecting network (70) to the first node in the first local area network (50). A comparison is carried out between the transmitted burst of trial data and the reflected burst of trial data to determine an estimate of packet loss rate of the path, and if the packet loss rate is acceptable a transmission of a continuous stream of data is initiated.

公开(公告)号：EP1721430A1

公开(公告)日：2006-11-15

申请号：EP05708473.3

申请日：2005-02-25

申请人： BAE Systems plc

发明人： WRAY, Stuart Charles ,  JONES, Clive Ellis ,  JENNER, Stephen, Matthew ,  SALTER, Robert, John

IPC分类号： H04L12/64

CPC分类号： H04L47/15 ,  H04L29/06027 ,  H04L47/70 ,  H04L47/762 ,  H04L47/801 ,  H04L47/822 ,  H04L65/1069 ,  H04L2012/6445 ,  H04L2012/6486

摘要： Described herein is a method of controlling call admission for packet switched networks, each network including at least two local area networks (50, 60) and a connecting network (70). The method comprises transmitting a burst 5 of trial data of the same size as the packet to be transmitted from a first node (52, 54) in a first local area network (50) to a second node (62, 64) in a second local area network (60) via the connecting network (70). The connecting network (70) comprises a plurality of routing nodes (72, 74, 76, 78, 80) for routing the burst of trial data of the same size as the packet to be transmitted from a first node (52, 54) in a first local area network (50) to second node (62, 64) in a second local area network (60) via the connecting network (70). The connecting network (70) comprises a plurality of routing nodes (72, 74, 76, 78, 80) for routing the burst of trial data to the second node in the second local area network along a particular path. The burst of trial data is reflected by the second node in the second local area network (60) back through the connecting network (70) to the first node in the first local area network (50). A comparison is carried out between the transmitted burst of trial data and the reflected burst of trial data to determine an estimate of packet loss rate of the path, and if the packet loss rate is acceptable a transmission of a continuous stream of data is initiated.

摘要翻译： 这里描述了一种控制分组交换网络的呼叫准入的方法，每个网络包括至少两个局域​​网（50,60）和连接网络（70）。 该方法包括将第一局域网（50）中的第一节点（52,54）发送的分组的相同大小的试用数据的突发5发送到第二节点（62,64） 局域网（60）经由连接网络（70）。 连接网络（70）包括多个路由节点（72,74,76,78,80），用于将与要从第一节点（52,54）发送的分组相同大小的试用数据的突发串接在 经由连接网络（70）到第二局域网（60）中的第二节点（62,64）的第一局域网（50）。 所述连接网络（70）包括多个路由节点（72,74,76,78,80），用于沿着特定路径将所述试用数据的突发路由到所述第二局域网中的所述第二节点。 试验数据的突发由第二局域网（60）中的第二节点通过连接网络（70）反射到第一局域网（50）中的第一节点。 在所发送的试验数据的突发与反映的试验数据的突发之间进行比较，以确定路径的分组丢失率的估计，并且如果分组丢失率是可接受的，则开始连续数据流的传输。