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    • 6. 发明授权
    • Mobile MAC protocol for LAN-coupled devices interconnected by an ATM wide area network
    • 通过ATM广域网互连的LAN耦合设备的移动MAC协议
    • US06606323B1
    • 2003-08-12
    • US09224469
    • 1998-12-31
    • Ram S. RamamurthyRadhika R. RoyPeter H. Stuntebeck
    • Ram S. RamamurthyRadhika R. RoyPeter H. Stuntebeck
    • H04L1228
    • H04L12/4608H04L12/5601H04L29/12009H04L29/12018H04L61/10H04L2012/5607H04L2012/5617
    • Enhanced performance of a WAN is achieved by allowing devices to move from LAN to LAN and have the move be transparent to end user applications. This is accomplished by allowing devices to move, with no action being taken in response to a move. Instead, notice is taken of the LANE Emulation Client (LEC) address at which a device can be reached when the device that moved chooses to communicate with some other device. In such a device initiates communication, a table is updated in a LAN Emulation Server (LES), which is an entity maintained by the WAN that interconnects a number of LECs. A similar table is maintained in each LEC, and the table of each LEC is updated whenever a connection is made between one of its devices and some other device. At times, of course, a LEC would have an incorrect address of a sought destination device. In such a case, the LEC sends a query to the LES, and the LES provides what the LES believes to be the correct LEC address. When the LES cannot resolve an address, a message is broadcast to the LES entities of other “emulated LANs,” or ELANs, which contains their own LES entities, and those LES entities have an opportunity to provide the correct address.
    • 通过允许设备从LAN移动到LAN并使终端用户应用程序的移动变得透明,可以实现WAN的增强性能。 这是通过允许设备移动来实现的,而不采取动作来响应移动。 取而代之的是,当移动设备选择与其他设备通信时,会注意到LANE仿真客户端(LEC)地址可以到达设备。 在这种设备中启动通信时,在LAN仿真服务器(LES)中更新一个表,该仿真服务器是连接多个LEC的由WAN维护的实体。 在每个LEC中保持类似的表,并且每当在其设备和其他设备之间进行连接时,更新每个LEC的表。 有时候,LEC会有一个不正确的寻址目标设备的地址。 在这种情况下,LEC向LES发送查询,LES提供LES认为是正确的LEC地址。 当LES无法解析地址时,会向其他“仿真LAN”的LES实体或包含其自己的LES实体的ELAN广播消息,并且这些LES实体有机会提供正确的地址。