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    • 11. 发明授权
    • Network-based service for the repair of IP multicast sessions
    • 基于网络的服务,用于修复IP组播会话
    • US07590889B1
    • 2009-09-15
    • US10874591
    • 2004-06-23
    • Nicholas Frank MaxemchukDavid McManamonDavid Hilton ShurAleksandr Zelezniak
    • Nicholas Frank MaxemchukDavid McManamonDavid Hilton ShurAleksandr Zelezniak
    • G06F11/00
    • H04L12/1868G06F11/1443H04L12/1863H04L12/1886H04L43/0847
    • A system and method are disclosed for the repair of IP multicast sessions. A repair server polls multiple transmit servers to accumulate as many of the packets missing from the multicast session as possible. A network includes a source of multicast packets in a multicast session and a plurality of multicast recipients in that session. A repair server in the network provides the packets it receives to the recipients. The repair server includes a missing packet detector. There is a plurality of retransmit servers in the network buffering portions of the packets they respectively receive during the session. The repair server maintains an ordered list of the retransmit servers that are most likely to have buffered copies of packets missing from the session. When the repair server detects that there are packets missing from the session it has received, it uses the ordered list to sequentially request the missing packets from respective ones of the plurality of retransmit servers.
    • 公开了用于修复IP多播会话的系统和方法。 修复服务器轮询多个发送服务器以尽可能多地累积多播会话丢失的数据包。 网络包括多播会话中的多播分组源和该会话中的多个多播接收者。 网络中的修复服务器将其接收的数据包提供给接收者。 修复服务器包括丢失的分组检测器。 在会话期间它们分别接收的分组的网络缓冲部分中存在多个重传服务器。 修复服务器维护最可能具有从会话丢失的数据包的缓冲副本的重新发送服务器的有序列表。 当修复服务器检测到它已经接收到的会话中丢失了数据包时,它使用有序列表来顺序地请求来自多个重传服务器中的相应数据包的丢失数据包。
    • 13. 发明授权
    • Method for a unicast endpoint client to access a multicast internet protocol (IP) session and to serve as a redistributor of such session
    • 用于单播端点客户端访问多播互联网协议(IP)会话并用作此类会话的再发行者的方法
    • US06181697B2
    • 2001-01-30
    • US09052028
    • 1998-03-31
    • Steven Howard NurenbergDavid Hilton ShurAleksandr Zelezniak
    • Steven Howard NurenbergDavid Hilton ShurAleksandr Zelezniak
    • H04L1256
    • H04L61/2507H04L12/1836H04L12/1854H04L29/12349H04L67/14H04L67/28H04L69/22H04L69/329
    • A endpoint client (111-1) on an IP Unicast network (107) that is provided access to a Multicast session on an IP Multicast network (101) through a Multicast-Unicast gateway server (MUS) (120) is enabled to re-Multicast that session to other endpoint clients (111-2) on the network to which it is connected or to endpoint clients (134, 135) on any Multicast-capable sub-network (132) to which it is directly connected. To act as a re-Multicaster, the endpoint client receiving Unicast-addressed packets from the session from the MUS, re-translates these Unicast-addressed packets to Multicast-addressed packets by translating the Unicast address in the distribution field of each packet's header into a Multicast address and overwriting the Unicast address in each header with the Multicast address. When an endpoint client on the same or connected sub-network as the re-Multicaster desires to join a session that is being re-Multicast, it needs only connect to that Multicast address. A endpoint client on a Unicast network can elect to be a re-Multicaster of packets from a session as long as that same session is not being re-Multicast by another endpoint client on any sub-network on which the electing re-Multicaster is connected or a Multicast router is not forwarding packets from the session onto the sub-network.
    • 通过组播单播网关服务器(MUS)(120)提供对IP组播网络(101)上的组播会话的访问的IP单播网络(107)上的端点客户端(111-1) 将其与其所连接的网络上的其他端点客户端(111-2)进行组播或者与其直接连接的任何具有多播能力的子网(132)上的端点客户端(134,135)进行组播。 为了充当重播器,端点客户端从MUS的会话接收单播寻址的分组,通过将每个分组头部的分发字段中的单播地址转换成多个组播寻址的分组,将其转换为多播寻址分组 一个组播地址,并用多播地址覆盖每个报头中的单播地址。 当与重新Multicaster相同或连接的子网络上的端点客户端希望加入正在重新组播的会话时,它只需要连接到该多播地址。 单播网络上的端点客户端可以选择是来自会话的数据包的重新连接,只要该相同会话不被另一个端点客户端在选择重新连接Multicaster的任何子网上重新组播 或者组播路由器不将数据包从会话转发到子网络。