binding update
绑定更新
[A] processing system [is] [...] configured to support a handoff of a network layer attachment point from a first one of the network functions to a second one of the network functions by sending a message to each of the network functions which identifies the second one of the network functions as a target of the handoff and performing a binding update for the second one of the network functions with a home agent.
为了实现MN与CN之间的直接通信，首先需要执行MN与CN之间的通信注册流程以完成绑定更新，使CN和HA在绑定缓存中保存有关绑定的信息，MN在绑定更新列表中保存有关CN的信息。在绑定更新过程中，MN通过绑定更新(Binding Update, BU)消息将其地址绑定信息发送给CN。为了避免MN和CN间的通信受到攻击，需要对BU消息进行保护。"
binding update
来自翻译宝典
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