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When does UE release the scheduling request resources?

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When does UE release the scheduling request resources?
posted Jul 1, 2014 by Manu Khaira

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1 Answer

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UE can release the resources in many cases:

  • Suppose the SR is configured for short duration so it can re-transmit the request unnecessarily. To prevent this when UE has transmitted SR for maximum amount times (dsr-TransMax) It can release the SR resource.
  • timeAlignmentTimer expiry
  • At time of MAC reset procedure
  • Handover time when MAC reset is required, even in that case it can release.
answer Jul 2, 2014 by Hiteshwar Thakur
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UE context release request and signal loss

Hi,

this is the scenario:

  1. UE is attached to an eNodeB
  2. UE performs (or not performs, it's the same) UL/DL data traffic
  3. After a few seconds: on UE I see on display that icon signal it is emptying. There is no signal anymore. UE doesn't send any particular message.
  4. Network side, I see that eNodeB sends to MME a "UE context release request" with cause "radio connection with UE lost" or "user inactivity" (also when UE is downloading/uploading!!!).
  5. As result, UE is no more able to attaches to eNodeB again: it is necessary the airplane mode to initiate the attach procedure again.

I think that UE loses the signal after eNodeB sends the "UE context release request"...

Whose fault is it?
Is device faulty? Because the problem is not present for other devices...
Or is eNodeB faulty? Because the problem is not present under another eNodeB.

I don't understand. Sorry and thank you if you'll answer.

...