NON-3GPP ACCESS TO 3GPP ACCESS INTER-RADIO ACCESS TECHNOLOGY HANDOVER WITH RESOURCE PREPARATION Russian patent published in 2013 - IPC H04W36/18 

FIELD: radio engineering, communication.

SUBSTANCE: during a pre-registration phase (800), a forward attachment function (260) receives a pre-attach request message (833) and creates (860) a mobility management context for the UE (210) that is valid for E-UTRAN access. During a resource preparation phase (900), the mobility management context is transferred to a mobility management entity (MME) (240) and radio and transport resources are reserved for the UE (210) at the target E-UTRAN cell (230). When handover is initiated (910) by either the UE or the non-3GPP network, the time-consuming authentication and authorisation procedures that are performed during the process of pre- registration can be skipped. Additionally, radio and transport resources have already been assigned to the UE and thus do not have to be set up when the handover is executed.

EFFECT: pre-registration phase and resource preparation phase reduce latency when user equipment hands over from a non-3GPP radio access such as WiMAX to an 3GPP radio access network such as E-UTRAN.

20 cl, 10 dwg