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    • 6. 发明申请
    • METHOD AND APPARATUS FOR COMMUNICATION HANDOFF
    • 通信手段的方法与装置
    • WO2009002656A2
    • 2008-12-31
    • PCT/US2008065399
    • 2008-05-30
    • QUALCOMM INCTINNAKORNSRISUPHAP PEERAPOLULUPINAR FATIHWANG JUNAGASHE PARAG ARUN
    • TINNAKORNSRISUPHAP PEERAPOLULUPINAR FATIHWANG JUNAGASHE PARAG ARUN
    • G08C17/00
    • H04W36/02H04W36/0011H04W80/04
    • Seamless communication handoff is achieved by establishing a protocol tunnel to route leftover packets between network access nodes during the handoff. For example, in a mobile IP-based system, a mobile node may perform a handoff from a first access node that is associated with a first routing node to a second access node that is associated with a second routing node. To prevent the loss of any packets that may be in route for delivery to or from the first routing node during the handoff, the mobile node establishes a protocol tunnel with the first access node via the second access node. On the forward-link, packets being delivered from the first routing node are routed over the protocol tunnel to the second access node and then to the mobile node. On the reverse-link, packets being sent to the first routing node are routed over the protocol tunnel from the mobile node to the second access node and then to the first routing node. In conjunction with these operations, the mobile node concurrently maintains separate IP interfaces for the routing nodes. In addition, steps are taken to ensure that packets are routed to the appropriate IP interface during the handoff.
    • 无缝通信切换是通过建立协议隧道来实现的,该协议隧道在切换过程中在网络接入节点之间路由剩余分组。 例如,在基于移动IP的系统中,移动节点可以执行从与第一路由节点相关联的第一接入节点到与第二路由节点相关联的第二接入节点的切换。 为了防止在切换期间传输到或来自第一路由节点的路由中的任何分组的丢失,移动节点经由第二接入节点与第一接入节点建立协议隧道。 在前向链路上,从第一路由节点递送的分组通过协议隧道路由到第二接入节点,然后传送到移动节点。 在反向链路上,发送到第一路由节点的数据包通过协议隧道从移动节点路由到第二接入节点,然后被路由到第一路由节点。 结合这些操作,移动节点同时为路由节点维护单独的IP接口。 此外,采取步骤确保在切换期间将数据包路由到相应的IP接口。