Question

What is RRC connection reject re-direction?

Answer 1

eNodeB  may send RRC Connection Reject in response to the UE’s  RRC Connection Request. This typically happens if the cell is congested and the necessary radio resources for the connection setup cannot be provided and/or the eNodeB is overloaded. According to the 3GPP TS 36.331 , there is no reject cause value specified for the RRC connection reject message in the LTE . However RRC connection reject message provides the wait time parameter. The value of this wait time is an integer number in the range of 1–16. Wait time defines how many seconds the UE should wait after reception of RRC Connection Reject until a new RRC connection request message is sent.