ip-can

zlulan

请问 pcc中 ip-can承载与ip-can会话之间的关系

爱卫生

实际上就是会话和承载的关系吧。

会话应该是指两个网元之间的通信，这里指的就是PCRF和PCEF之间的通信。而承载应该是针对某一类型业务所提供的传送管道，通过IP-CAN会话协商的结果来建立。例如GGSN建立PDP激活时，发CCR消息给PCRF请求用户策略，这时就发起了IP-CAN会话建立。等到PCRF响应CCA提供了相应的策略给GGSN，GGSN需要完成和PDP上下文的绑定（有对应的Qos），这时候绑定了策略的这个PDP上下文就可以看成是一个IP-CAN Bearer。

爱卫生

不好意思以上是个人理解。完整的说明参考TS29.212的3.1节的定义。原文如下：

IP-CAN bearer: IP transmission path of defined capacity, delay and bit error rate, etc.See 3GPP TS 21.905 [1] for the definition of bearer.

IP-CAN session: association between a UE and an IP network.The association is identified by one or more UE IPv4 addresses/ and/or IPv6 prefix together with a UE identity information, if available, and a PDN represented by a PDN ID (e.g. an APN). An IP-CAN session incorporates one or more IP-CAN bearers. Support for multiple IP-CAN bearers per IP-CAN session is IP-CAN specific. An IP-CAN session exists as long as the related UE IPv4 address and/or IPv6 prefix are assigned and announced to the IP network.