watson100 发表于 2011-8-18 11:28
在3G中,不考虑IU-CS。
对于一个用户来说,如果它的IU connection release了,是不是必然伴随着RRC conn ...
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对应的步骤说明是:
2)The SGSN releases the Iu by sending the Iu Release Command (Cause) message to the RAN. This message may be triggered either by an Iu Release Request message, or by another SGSN event (e.g. authentication failure, detach or the subscription to the CSG ID expires). The SGSN shall take the responsibility to release the Iu interface when the UE has no active PDP context, either immediately or after some timeout. It is optional for the SGSN to send the Iu Release Command message after an Iu Release Request message with Cause set to User Inactivity is received from the RAN.
3)If the RRC connection is not already released (Cause = User Inactivity), the RAN sends a Release RRC Connection message to the MS.
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