是的。找到规范了。H大侠说的没错。
TS23.401的5.4.1章节介绍专有承载激活流程中:
第3步MME收到了SGW发过来的Create Bearer Request消息后,在第4步给eNB发送Bearer Setup Request。即“The MME then signals the Bearer Setup Request (EPS Bearer Identity, EPS Bearer QoS, Session Management Request, S1-TEID) message to the eNodeB.”
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