gprs与epc的区别的这句话是啥意思？
时间：12-27
整理：3721RD
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如题。
读那个Volte的书，有句话不理解
One difference between the GPRS core and EPC is the strict and in-built separation of control and user plane in EPC. This is possible in GPRS as well by using the direct tunnel feature, but with direct tunnel the SGSN user plane is used, for example, in an international roaming scenario.
尤其是最后一句在国际漫游的场景下，怎么理解？
读那个Volte的书，有句话不理解
One difference between the GPRS core and EPC is the strict and in-built separation of control and user plane in EPC. This is possible in GPRS as well by using the direct tunnel feature, but with direct tunnel the SGSN user plane is used, for example, in an international roaming scenario.
尤其是最后一句在国际漫游的场景下，怎么理解？
简单翻译就是：
GPRS 核心网和EPC一个主要的区别，就是EPC是完全严格的、固定的控制面和用户面相分离；
GPRS中也是有可能的，就是当使用直达隧道场景的时候，但是直达隧道场景的SGSN用户面已经被占用的情况下，才能出现控制面和用户面的严格分离，比如说国际漫游的场景。
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