Correlation ID for local IP access

摘要

The invention relates to a home cellular base station (HeNB), comprising a radio interface (RI), to communicate with a user equipment (UE), a local interface (LI), to communicate with a local gateway (L-GW) providing access to a local IP network, a user plane interface (S1-U), to communicate with a serving gateway (SGW), and a control plane interface (S1-MME), to communicate with a control node (MME). The home cellular base station (HeNB) further comprises a selection module (SelMod) set to obtain a first correlation ID for enabling a direct user plane path between the home cellular base station (HeNB) and the local gateway (L-GW), the first correlation ID being obtained via the control plane interface (S1-MME) upon each establishment of a bearer providing access to the local IP network.;The invention also relates to a control node (MME), to a home subscriber server (HSS), to a direct path enablement method, and to a PDN management method.

主权项

1. A method for providing Local IP Access (LIPA), the method comprising:
for uplink data transmission, if a correlation identification (ID) is included in a request message received from a mobility management entity (MME), enabling, by an apparatus having a base station collocated with a local gateway (L-GW) providing a direct user plane path between the base station and the L-GW, the direct user plane path by using the correlation ID, wherein the apparatus uses an interface configured at the L-GW, the interface comprising an S5 interface, the correlation ID comprising a General Packet Radio Service (GPRS) Tunneling Protocol (GTP) based endpoint identifier of the S5 interface or a Generic Routing Encapsulation (GRE) key of the S5 interface configured between the local gateway and the S-GW; and for downlink data transmission, if the base station establishes a secure link with a security gateway (SeGW) and the L-GW uses the same secure link with the SeGW, discriminating, by the apparatus, at least one downlink packet delivered through the secure link to the base station and the L-GW by using different IP address, the different IP address being allocated to the base station and the L-GW.