amr 发表于 2013-11-3 18:15
图和步骤稍微有点不匹配,我看的是V10的版本文档,我就贴这个图吧:
看看这个图是不是清楚一点? 一个请求应该是可以释放多个承载的。典型的场景应该是释放默认承载伴随释放多个专有承载的过程,即整个PDN链接都释放了。理论依据是S1AP的规范关于E-RAB release command的定义和流程说明,如下: “The MME initiates the procedure by sending an E-RAB RELEASE COMMAND message. The E-RAB RELEASE COMMAND message shall contain the information required by the eNB to release at least one E-RAB in the E-RAB To Be Released List IE. If a NAS-PDU IE is contained in the message, the eNB shall pass it to the UE. Upon reception of the E-RAB RELEASE COMMAND message the eNB shall execute the release of the requested E-RABs. For each E-RAB to be released the eNB shall release the corresponding Data Radio Bearer and release the allocated resources on Uu. ” 因为规范里定义了E-RAB to be released list这个参数,所以一次可以释放多个。 个人理解。 |