While UE attachment, should UE context release happen if Initial Context Setup is not received @ eNB?

Question

Hi,

In LTE, while UE makes an RRC Connection attempt and in the followed by procedures, if S1AP: Initital Context Setup Request is BLOCKED from MME to eNB, then what eNB should do ideally?

Should it do UE context release, if Initial Context Setup Request message is not received at aNB?

Comments

MME must be expecting Initial context setup response or Initial Context setup failure in this case. If not received any of these then ideally it (MME) should re-initiate the request.

I hope I understood the question correctly.

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Shalil,
Thanks for your update.
But, we are intentionally blocking ICSR at MME. What action should UE and eNB take during that time? As there are some timers running on both eNB and UE, what if they expire during this period?

In particular, if we are able to block ICS Request message, should eNB do RRC release?

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What is the name of the timer if it is inactivity then it should be context setup release.

If it is some other timer then ideally it should re-initiate the process before marking it release.

Answer 1

When eNodeB does not receives initial context setup request from MME then eNodeB sends rrcconnection release to UE.

Comments

Is it vendor's proprietary implementation or 3GPP standard says. If it is defined in 3GPP then please share the reference. Thanks in advance.

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This timer is not defined in 3GPP standard. It is vendor's specific.

Answer 2

As per 24.301 specification, UE starts timer T3410 once it triggers Attach request and wait for Attach Accept or Reject. On timer expiry T3410, UE-NAS layer starts timer T3402 or T3411. For more details, please go through specification.