ETSI ES 283 026-2008 电信和互联网融合业务及高级网络协议(TISPAN).资源和准入控制.业务策略决策功能(SPDF)与接入资源和准入控制功能(A-RACF)之间的QoS保留信息交换协议
Telecommunications and Internet converged Services and Protocols for Advanced Networking (TISPAN); Resource and Admission Control; Protocol for QoS reservation information exchange between the Service Policy Decision Function (SPDF) and the Access-Resourc
The present document provides the stage 3 specification of the Rq interface. The functional requirements and the
stage 2 specifications of the Rq interface are contained in ES 282 001 [1] and ES 282 003 [2]. The Rq interface is the
interface between the Service Policy Decision Function (SPDF) and the Access - Resource and Admission Control
Function (A-RACF) and is used for QoS resource reservation information exchange between the SPDF and the
A-RACF. Via the Rq interface the SPDF issues requests for resources in the access network, indicating IP QoS
characteristics. The A-RACF uses the IP QoS information to perform admission control and indicate to the SPDF via
the Rq interface its admission control decisions. Due to the possible business roles in an access environment, the SPDF
may be either in the same domain or in a different domain as the A-RACF.
The present document defines:
? The information to be exchanged between SPDF and A-RACF over the Rq interface.
? An Rq interface definition based on the Diameter protocol.
In situations where no generic overload control mechanism is used on the Rq interface, the interface shall only be
capable of supporting a one-to-one relationship between the A-RACF and SPDF (i.e. one SPDF may only contact one
A-RACF, and that A-RACF may only contact that same SPDF). Overload control need not be supported in this
situation due to the fact that it should be possible to traffic engineer the capabilities of the two entities, so that the
capacity of one entity matches the capacity of the other.