标准摘要
[中文适用范围]： 本国际标准规定了在专用综合业务网络（PISN）内连接在一起的专用综合业务网络交换机（PINX）之间的 Q 参考点处支持短消息服务（SMS）的信令协议。 该服务基于 GSM 03.40。 本国际标准中描述的服务中心功能等同于 GSM 03.40 中服务中心的功能。 因此，为了与GSM网络互操作，只需要实现QSIG接口。 注 1 – 不排除与其他空中接口的互通，但不属于本国际标准的范围。 注2 – 短消息服务是一种特殊类型的基本服务，但在本文件中被描述为补充服务。 短消息服务是一种允许服务用户向同一 PISN 或另一个网络中的另一个用户发送有限大小的消息的服务。 Q 参考点在 ISO/IEC 11579-1 中定义。 服务规范按照 ETS 300 387 中指定的方法分三个阶段制定。 本国际标准包含 Q 参考点的第 3 阶段规范，并满足 ISO/IEC 21989 中第 1 阶段和第 2 阶段规范确定的要求。 SMS 的信令协议在面向连接的呼叫独立 APDU 传输机制的信令协议之上运行，并使用 ISO/IEC 11582 中指定的用于控制补充服务的通用过程的某些其他方面。 该国际标准还指定了附加信令支持 SMS 和补充服务与 ANF 之间 Q 参考点交互的协议要求。 本国际标准适用于可以互连形成 PISN 的 PINX。 [外文原描述]： ISO/IEC 21990:2002 specifies the signalling protocol for the support of the Short Message Service (SMS) at the Q reference point between Private Integrated services Network eXchanges (PINXs) connected together within a Private Integrated Services Network (PISN). This service is based on GSM 03.40. The Service Centre functionality described in ISO/IEC 21990:2002 is equal to the functionality of a Service Centre in GSM 03.40. Thus, for interoperability with a GSM network, it is only necessary to implement a QSIG interface. NOTE 1 The interworking with other air interfaces is not precluded, but is outside the scope of ISO/IEC 21990:2002. NOTE 2 The Short Message Service is a special type of basic service but is described in the present document as a supplementary service. The Short Message Service is a service which permits a served user to send a message of limited size to another user in the same PISN or another network. The Q reference point is defined in ISO/IEC 11579-1. Service specifications are produced in three stages and according to the method specified in ETS 300 387. ISO/IEC 21990:2002 contains the stage 3 specification for the Q reference point and satisfies the requirements identified by the stage 1 and stage 2 specifications in ISO/IEC 21989. The signalling protocol for SMS operates on top of the signalling protocol for the connection oriented call independent APDU transport mechanism and uses certain further aspects of the generic procedures for the control of supplementary services specified in ISO/IEC 11582. ISO/IEC 21990:2002 also specifies additional signalling protocol requirements for the support of interactions at the Q reference point between SMS and supplementary services and ANFs. ISO/IEC 21990:2002 is applicable to PINXs which can be interconnected to form a PISN.
英文名称Information technology - Telecommunications and information exchange between systems - Private Integrated Services Network - Inter-exchange signalling protocol - Short message service