第二个问题:
是的。根据TS48.018规范的8.2章节关于流控的描述如下:
“The model of the algorithm is that an LLC-PDU is passed by the algorithm as long as the bucket counter (B) plus the length of the LLC-PDU does not exceed the bucket size Bmax. When the LLC-PDU is passed, the LLC-PDU length is added to B. Any PDU not transmitted is delayed until B plus the LLC-PDU length is less than Bmax.”
上面提到的B全名是bucket counter,初始值为0.虽然较counter,但实际上是缓冲区的容量,单位是字节。缓冲区不能太大,否则就会有延迟,也不能太小,否则就会有丢包。关于B的设置可以参考另一篇帖子。 http://www.gprshome.com/forum.php?mod=viewthread&tid=121&extra=page%3D1 “Gb接口的流量控制”或TS48.018的8.2章节关于流控的描述。作者: skyever 时间: 2012-8-21 10:17:44
爱卫生 规范中原话是:"The SGSN may at any time request the modification of the contents of an existing BSS packet flow context, e.g. due to the activation, modification, or deactivation of a PDP context. 发表于 4 分钟前
如你所提到的,BSC也会根据自己 的资源情况发起modify-pfc的流程啊