本文件的目的是定义一个开放规范，用于为基于IP的多媒体卫星实现QoS 系统，基于DiffServ模型。如果进入BSM网络的IP数据包需要特定的QoS处理，则它们 必须映射到QID上。因此，选择BSM网络内部使用的QID尤为重要。 因此，本文档指定了在使用DiffServ时QID的分配及其到IP QoS类的映射 用于在IP层提供QoS。本文件假设ETSI中描述的QoS功能架构 TS 102 462[2]。本文件详细描述了QID的定义、BSM如何分配和处理QID 以及BSM网络中发送和接收卫星终端（STs）所需的要求 QID管理功能。本文档还定义了应在整个系统中使用的原语 在分配QID时，在将区分服务代码点（DSCP）和IP服务映射到QID时，在映射 QID到SD队列。通过一些例子详细介绍了QID映射。本文列举了一些案例来说明这种可能性 从具有准静态QID分配的简单QoS解决方案演变为具有动态QID分配的更复杂服务 资源预约。DiffServ与多播传输的结合不在本文件的范围内，也不在本文件的使用范围内 显式拥塞通知（ECN），仅出于历史原因才链接到DiffServ，与ECN位相同 IPv4 ToS八位字节的两个最低有效位。 第4条对此有更好的解释。

The aim of the present document is to define an open specification for enabling QoS for IP-based multimedia satellite systems, based on the DiffServ model. If IP packets entering the BSM network require a particular QoS treatment, they have to be mapped onto QIDs. The choice of the QID to be used inside the BSM network is thus particularly important. So the present document specifies the allocation of the QIDs and their mapping to IP QoS classes, when DiffServ is used to provide QoS at IP layer. The present document assumes the QoS functional architecture described in ETSI TS 102 462 [2].The present document describes in detail how QIDs are defined, how they are allocated and handled by the BSM network, and the requirements needed by sending and receiving Satellite Terminals (STs) in a BSM network to provide QID management functionalities. The present document also defines the primitives that should be used across the SI-SAP when allocating QIDs, when mapping DiffServ Code Points (DSCPs) and IP services to QIDs, when mapping QIDs to SD queues.Details on the QID mapping are presented with some examples. Some cases are presented to show the potential evolution from a simple QoS solution with quasi-static QID allocation to more sophisticated services with dynamic resource reservation.The combination of DiffServ with multicast transmissions is out of scope of the present document, as well as the use of Explicit Congestion Notification (ECN), which was linked to DiffServ only for historical reasons, as the ECN bits are the two least significant bits of the IPv4 ToS octet. This is better explained in clause 4.