3GPP PCC 总体结构(非漫游)

PCRF（策略和计费规则功能）是业务数据流和IP承载资源的策略和计费控制判决单元  Policy charging and rules function (PCRF) is the node designated in real-time to determine policy rules in a multimedia network.[1] As a policy tool, the PCRF plays a central role in next-generation networks. Unlike earlier policy engines that were added on to an existing network to enforce policy, the PCRF is a software component that operates at the network core and efficiently accesses subscriber databases and other specialized functions, such as a charging systems, in a scalable, reliable, and centralized manner. The PCRF as the part of the network architecture that aggregates information to and from the network, operational support systems, and other sources (such as portals) in real time, supporting the creation of rules and then automatically making intelligent policy decisions for each subscriber active on the network. Such a network might offer multiple services, quality of service (QoS) levels, and charging rules