那是不是说这些TFT参数和Qos参数的设置都是通过MMI(用户界面)来设置的
比如说MMI设置的TFT operation code为:creat new TFT/add packetfilter to existing TFT/replace packetfilter in existing TFT/delete packetfilter from existing TFT, NAS的ESM收到MMI发起的业务请求后,先查TFT operation code,如果为creat new TFT,则发起bearer source allocation preocedure,如果为add packetfilter to existing TFT/replace packetfilter in existing TFT/delete packetfilter from existing TFT则发起bearer source modification procedure.
我个人认为ESM 在发起bearer source modification procedure和bearer source allocation preocedure是没法自己主动填写TFT和QOS,因为ESM只负责流程发起,不知道什么样的业务需要填写什么样的TFT和QoS参数?
另外还有个问题
在23401中描述的UE requested bearer resource modification流程中有说到:The UE sends the Linked Bearer Id (LBI) only when the requested operation is add, to indicate to which PDN connection the additional bearer resource is linked to. 我认为这个LBI是不需要携带的,因为如果bearer resource modification procedure invokes active dedicated eps bearer request procedure,网络会主动分配LBI给这个dedicated eps bearer
另外我看23.401中UE requested bearer resource modification的TAD operation code有modify or delete or add三种
24.301中的UE requested bearer resource modification的operation code有下面几种:
no tft operation codenly change GBR without changing the packetfilter(s);
"Replace packet filters in existing TFT" or "Add packet filters to existing TFT":to request modification of traffic flow aggregate
Delete packet filters from existing TFT:to request a release of bearer resources