The key idea is : The uplink message and downlink message are handling separately, using global link list, buffer queue and semaphore for information exchange. 基本思想为:上下行信令分开处理,采用全局链表、缓冲队列和信号量方式进行交互。
In uplink NAS message piggybacking is used only for transferring the initial NAS message during connection setup. 上行捎带NAS消息仅仅用于在建立连接的过程中传输初始的NAS消息。
The author first defines the interfaces used by operations of uplink and downlink info, including Logistics Markup Language and Short Message Service encoding, and then six links were raised for attention, also designs expansion of additional links. 作者首先定义了上行和下行操作所使用的信息接口,包括物流标记语言和短信语义编码,然后分别针对六个环节提出了注意事项,此外还设计了可用于扩展的额外环节。