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版大您好,首先感謝您的回覆。
對於SDF的描述,您說是用TFT的packet filter來分辨他的QoS,也就是把SDF對應到相應QoS的EPS bearer上。假設是這樣的話,那SDF template的作用是什麼呢?
在TS23.203 SDF detection章節裡描述:
This clause refers to the detection process that identifies the packets belonging to a service data flow:
-Each PCC rule contains a service data flow template, which defines the data for the service data flow detection;
-Each service data flow template may contain any number of service data flow filters;
-Each service data flow filter is applicable uplink, downlink or both uplink and downlink;
-Service data flow filters are applied for each direction, so that the detection is applied independently for the downlink and uplink directions;
在對照此標準裡 figure6.3 及 figure6.4及以下說明:
Service data flow filters identifying the service data flow may:
-be a pattern for matching the IP 5 tuple (source IP address or IPv6 network prefix, destination IP address or IPv6 etwork prefix, source port number, destination port number, protocol ID of the protocol above IP).
他的描述不也是說,packet flow(packet data)會先經過SDF filter過濾形成SDF,而這些SDF filter就形成SDF template。
那經過SDF template後的SDF不就是有相同端口号,源IP,目的IP。那麼在經過TFT template的packet filter也是在區分同樣訊息的話,不就有點重複意味了?
真的不好意思,小弟一直被這些東西困惑著,還請版大多包涵,花點耐心解惑喔,謝謝!
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