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LTE Advanced:How Scell release is triggered by RRC connection re-establishment procedure?

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LTE Advanced:How Scell release is triggered by RRC connection re-establishment procedure?
posted Mar 16, 2016 by Gnanendra Reddy

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1 Answer

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UE should release all configured Scell if Reestablishment procedure is initiated.
At EnodeB side If receives RRCReestablishmentRequest and finds the UE context can configure Scell again using RRCConnectionReconfiguration after receiving Reestablishment Complete from UE.

answer Mar 17, 2016 by Ashish Barapatre
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Why eNB sending separate rrc connection reconfiguration for configuration of each scell? Why eNB not sending configuration of all scell in single rrc connection reconfiguration?

+5 votes

I have scenario where in I have to gracefully shutdown/disconnect all UE's in connected state at RRC and go for reboot of the complete system. Here are the steps that I have followed -
1. Find all UE's in RRC which are in connected state
2. Send UE Context Release Request to MME for the UE with Cause as Misc_Cause_O_M_Intervention.
3. Once we receive UE Context Release Command from MME, Start UE Release procedure at eNodeb.
4. When we send RRC Connection Release Use Cause as "other"
5. Send UE Context Release Complete to MME.
6. Repeat Above steps for all UE's.
7. Go for reboot.

Here in this scenario, after sending RRC Connection Release to UE, it is immediately trying to connect to eNodeb with message RRC Connection Request with establishmentCause as "HighPriorityAccess" and MME is releasing the UE again.

I wanted to know why UE is trying to connect again.

FYI: UE was just in connected state and it was doing any data transfer (Both in Uplink and Downlink).

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