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IDLE mobility in LTE?

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Is it possible to have mobility in IDLE mode if so please provide some pointers?

posted Sep 9, 2014 by Kuldeep Apte

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Yes it is possible and difficult to describe here in detail so I suggest you take a look at 36.304 for LTE idle mobility, for GERAN see 45.008, and for 3G check 25.304.

1 Answer

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When we talk about "Idle" mode mobility, it mean track an UE when it doesn't have RRC connection with an eNodeB. When UE is in ECM-IDLE or RRC-IDLE, it's location can't be tracked at the cell level granularity.

In LTE, the geographical location is divided into cell(s) and tracking area(s). One tracking may consist of a number of cell(s). MME is the node which maintains UE's location at the granularity of tracking area when an UE is in ECM-DILE or we can say when there is no radio connection between UE and eNodeB. So there are two possibilities may occurs:

  1. Down link data is coming: In that case, SGW informs to MME and MME initiates paging for that UE.
  2. UE's tracking area is changed due to its mobility: UE is moved to new tracking area to it's mobility.
answer Sep 10, 2014 by Neelam
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+2 votes

Is it vendor specific or standard defined the behavior when UE does not report its location to MME even after TAU timer expires ?
Here assumed , LTE UE is out of coverage .

+1 vote

Documentation does not provide much details specially the state the context of when this message is generated. Any pointer would be very helpful?

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