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2. 发明授权

US07082114B1 System and method for a wireless unit acquiring a new internet protocol address when roaming between two subnets 有权
标题翻译：无线单元在两个子网之间漫游时获取新的因特网协议地址的系统和方法
公开(公告)号：US07082114B1
公开(公告)日：2006-07-25
申请号：US09753218
申请日：2000-12-28
申请人： Darwin A. Engwer , Jonathan M. Zweig , Paul McDaid
发明人： Darwin A. Engwer , Jonathan M. Zweig , Paul McDaid
IPC分类号： H04Q7/00
CPC分类号： H04W36/0011 , H04W80/04
摘要： In a wireless network system having a wired backbone network with two or more sub-networks, each having one or more access points for communicating with wireless units via a wireless transmission medium, a system, apparatus and method for a wireless unit to determine whether a candidate access point is on a different sub-network than its current access point. If the wireless unit determines that the candidate access point is on a different sub-network, then the wireless unit releases its current network protocol address which was valid for the current sub-network, and obtains a new network protocol address valid for the new sub-network. This is accomplished by the candidate access point transmitting a multicast packet that includes the network protocol address of the access point and the subnet mask of the sub-network which the access point is on. By receiving this multicast packet, the wireless unit can determine if the candidate access point is on a different sub-network than its current sub-network. Also disclosed is a technique for a wireless unit to determine whether to roam to a candidate access point based on the signal qualities to its current and candidate access points, and whether the candidate access point is on a different sub-network or a designated restricted sub-network.
摘要翻译：在具有具有两个或多个子网络的有线骨干网络的无线网络系统中，每个子网络具有用于经由无线传输介质与无线单元通信的一个或多个接入点，用于无线单元的系统，装置和方法，用于确定是否候选接入点位于与其当前接入点不同的子网络上。如果无线单元确定候选接入点在不同的子网上，则无线单元释放其对当前子网有效的当前网络协议地址，并获得对新子网有效的新网络协议地址 -网络。这是通过候选接入点发送包括接入点的网络协议地址和接入点所在的子网络的子网掩码的组播分组完成的。通过接收该多播分组，无线单元可以确定候选接入点是否在与其当前子网络不同的子网络上。还公开了一种用于无线单元基于其当前和候选接入点的信号质量来确定是否漫游到候选接入点的技术，以及候选接入点是否在不同的子网络或指定的受限子网 -网络。

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