Method and system for setup or modification of data flows, primary node, secondary node, UE and computer program product

1. A method, in a radio communication system, for setup or modification of data flows between user equipment (UE) in dual connectivity with a primary node and a secondary node of the radio communication system, comprising:

switching a data path between the primary node and the secondary node by:

transmitting a traffic offload request from the primary node to the secondary node;

transmitting a path switch request message from the secondary node to the primary node, the path switch request message including tunnel-end point related information for an offloaded bearer; and

transmitting another path switch request message for the secondary node from the primary node towards a mobility management entity (MME), the another path switch request message including tunnel-end point related information for an offloaded bearer;

wherein the transmitting the another path switch request message establishes a direct user plane path between the secondary node and a serving gateway (S-GW) of the radio communications system by transmitting a modify bearer request message from the MME to the S-GW.

2. The method of claim 1 , wherein the switching the data path includes determining if a traffic bearer should be offloaded from the primary node to the secondary node or vice versa on the basis of radio measurements between the UE and the primary and secondary nodes.

3. The method of claim 1 , wherein a radio resource control (RRC) entity is provided at one or both of the primary and secondary nodes for communication with the UE.

4. The method of claim 3 , wherein the RRC entity at the primary or secondary nodes performs radio bearer related configuration for an offloaded data flow over the corresponding node.

5. The method of claim 1 , wherein a radio resource control (RRC), entity for communication with the UE is at the primary node, and performs mobility related control and signalling and radio bearer related signalling for a data flow supported over the primary node.

6. A computer program product, comprising a non-transitory computer usable medium having computer readable program code embodied therein, said computer readable program code adapted to be executed to implement the method of claim 1 .

7. A radio telecommunication system comprising:

a primary node;

a secondary node;

a UE in dual connectivity with the primary node and the secondary node of the radio communication system;

the system operable to switch a data path between the primary node and the secondary node by:

transmitting a traffic offload request form the primary node to the secondary node;

transmitting a path switch message from the secondary node to the primary node, the path switch request message including tunnel end point related information for an offloaded bearer; and

transmitting another path switch request message for the secondary node from the primary node towards a mobility management entity (MME), the another path switch request message including tunnel-end point related information for an offloaded bearer; wherein the transmitting the another patch switch request message establishes a direct user plane path between the secondary node and a serving gateway (S-GW) of the radio communication system by transmitting a modify bearer request message from the MME to the S-GW.

8. The system of claim 7 , further operable to determine if a traffic bearer should be offloaded from the primary node to the secondary node or vice versa on the basis of radio measurements between the UE and the primary and secondary nodes.

9. The system of claim 7 , further comprising an RRC entity at one or both of the primary and secondary nodes to communicate with the UE.

10. The system of claim 9 , wherein the RRC entity at the primary or secondary nodes is operable to execute radio bearer related configuration for an offloaded data flow over the corresponding node.

11. The system of claim 7 , wherein a radio resource control (RRC) entity is at the primary node, and the RRC is operable to:

communicate with the UE; and

execute mobility related control and signalling and radio bearer related signalling for a data flow supported over the primary node.

12. A primary node operable in a dual connectivity link with a UE, the primary node configured to:

switch a data path between the primary node and a secondary node by being configured to:

transmit a traffic offload request from the primary node to the secondary node;

receive a path switch request message from the secondary node, the path switch request message including tunnel end point related information for an offloaded bearer;

and transmit another path switch message for the secondary node towards a mobility management entity (MME), the another path switch request message including tunnel-end point related information for an offloaded bearer;

wherein the transmitting the another path switch request message establishes a direct user plane path between the secondary node and a serving gateway (S-GW) of a radio communication system by transmitting a modify bearer request message from the MME to the S-GW.

13. A secondary node, operable in a dual connectivity link with a UE, the secondary node configured to:

switch a data path between a primary node and the secondary node by being configured to:

receive a traffic offload request from the primary node;

transmit a path switch request message the primary node, the path switch request message including tunnel end point related information for an offloaded bearer; and

cause another path message for the secondary node to be transmitted from the primary node, the path switch request message sent towards a mobility management entity (MME), the another path switch request message including tunnel-end point related information for an offloaded bearer;

wherein the transmitting the another path switch request message establishes a direct user plane path between the secondary node and a serving gateway (S-GW) of a radio communications system by transmitting a modify bearer request message from the MME to the S-GW.