ENHANCED ATTACHMENT PROCEDURE FOR ATTACHING A UE TO A 3GPP ACCESS NETWORK
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Abstract
The invention relates to methods for (re)attaching a UE to a 3GPP access network and for storing bearer context information of a UE upon handover from a 3GPP access network to a non-3GPP access network. Furthermore, the invention relates to 3GPP network nodes, such as mobility management entity, serving gateway and packed data gateway, and a UE that are specially adapted to perform these methods. In order to decrease of the delay time during (re)attachment of a UE to a 3GPP access network, the invention proposes to maintain context information on data bearer(s) of a UE within the 3GPP access network and the UE, while the UE is not attached to the 3GPP access network, so that data bearer context information for this UE is available and can be used for the (re)activation of data bearer(s) once the UE is attaching to the 3GPP access network again.
136 Citations
48 Claims
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1-35. -35. (canceled)
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36. A method for storing bearer context information of a user equipment upon handover from a 3GPP, 3rd Generation Partnership Project, access network to a non-3GPP access network, the method comprising:
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in response to the user equipment moving to the non-3GPP access network, releasing resources of data bearers of the user equipment within the 3GPP access network, and maintaining by a mobility management entity of the 3GPP access network serving the user equipment bearer context information of the released data bearers, receiving at the mobility management entity a signaling message indicating the establishment of a new data bearer for the user equipment, while the user equipment is not attached to the 3GPP access network, and generating and storing data bearer context information for the new data bearer by the mobility management entity. - View Dependent Claims (37, 38, 39, 40, 41, 42, 43, 44)
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45. A user equipment for use in a 3GPP, 3rd Generation Partnership Project, access network and a non-3GPP access network, comprising:
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a storage unit for storing data bearer context information of data bearers of the user equipment in a 3GPP access network, a communication unit for attaching the user equipment to a 3GPP access network or a non-3GPP access network, a processing unit programmed to decide, while the user equipment is attached to the non-3GPP access network and in response to a new data flow, whether a new PDN, Packet Data Network, connection or new data bearer would be required for the new data flow in the 3GPP access network, wherein the processing unit is further programmed to update, in response to the decision, the data bearer context information in said storage unit. - View Dependent Claims (46, 47, 48)
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Specification