Response to a non access stratum message

  • US 10,743,366 B2
  • Filed: 12/20/2018
  • Issued: 08/11/2020
  • Est. Priority Date: 09/28/2010
  • Status: Active Grant
First Claim
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1. A method in a core network communicatively connected to a radio access network (RAN) comprising a first network element and a second network element, comprising:

  • receiving, by a mobility management node in the core network, a first Non Access Stratum (NAS) message via the second network element from a user equipment (UE), wherein the mobility management node stores a first identifying characteristic associated with at least one of a Local IP Access (LIPA) packet data network (PDN) connection or a selected IP traffic offload (SIPTO) PDN connection, the at least one of the LIPA PDN connection or the SIPTO PDN connection being via the first network element and for the UE;

    detecting, by the mobility management node, that the UE is connected to the second network element that is different from the first network element that has the first identifying characteristic, wherein the detecting comprises determining that the first NAS message is received via the second network element; and

    in response to a condition that each PDN connection of the UE is a LIPA PDN connection or a SIPTO PDN connection, sending, by the mobility management node, a second NAS message, the second NAS message including a cause code with a value that represents “

    No EPS Bearer Context Activated.”

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