Hi,

I've one question.

If UE initiates Detach with cause as Switch off, does the network stiil sends RRCConnectionRelease to UE.

Hi,

when UE gets switch off, UE stops sending a periodic tracking area updates and N/W will read this situation as UE is not reachable and in this case, N/W will initiate detach procedure. 

The MME transmits the UE context release command to eNB to release the UE-associated logical connection. Then, the eNB transmits the RRC connection release to the UE, releases the eNB resource, and transmits the UE context release complete to the MME to complete the call release procedure. 
An MME-initiated call release occurs in the following cases.
1. A procedure between UE and MME is completed (e.g. Detach).
2. A call in the source eNB is released due to successful handover.
3. A call in the target eNB is released due to cancelled handover.
4. The old logical connection is to be released when 2 logical connections are established for a specific UE (e.g. when UE duplication occurs in the MME).
5. The UE is not a CSG member of the CSL cell.

Hi, if ue combined attached to lte , if imsi detach, whether only deactive the cs

domain  security and authentication?

Hi,

can anyone tell about PCC Rule Removal?

After Step 16 in case of MME initiated Detach is the UE expected to ack the RRC Connection release message? I think since UE has released all the resources after sending the Detach Accept it cannot send the Ack. But in one of the operator specs it is expecting the RRC Connection release ACK. Please comment.

Hi,

I would like to know, what happens when the battery is removed from the UE, how does the detach scenario play out ?

I believe the UE is not able to send any detach request when the battery is removed abruptly, but I would like to know how does the NW perform a detach in this case(if at all it perfoms a deatch). Tried reading the specification, but I could not find this Use Case. Any help would be appreciated. 

Not able to register since my company email id has "." Eg. sasi.reddy@Ltts.com

Hi Tushar,

if Battery is removed UE doesnt send detach request to Network. Network doesn't know status of UE thinks it is in IDLE.

here 2 things may let the Network about UE.

1. paging message sent by Network, there will be no RRC connection from UE so Network may think UE is in out of coverage. based on this Network can trigger internal detach.

2. There will be no Periodic TAU after perodic timer expiry, so Netowrk considers UE is in out of coverage and implicitly Detaches the UE

Why do UE get Detach type=3 and attach type = 2 in LTE detach and attach process