Method and arrangement in an lte femto system

A method in a user equipment for enabling a handover of a connection to the user equipment from a source cell to a target cell associated with a target cell identity, which source cell is served by a source radio base station, and which target cell is served by a target radio base station, wherein the target radio base station and the source radio base station are comprised in a radio communications network, and wherein the target radio base station is adapted to be connected to a gateway node associated with a network node identity, which gateway node is acting as a proxy for the target radio base station towards a core network and towards the source radio base station, the method characterised in comprising

• receiving the target cell identity and a mask broadcasted within the target cell on a radio channel from the target radio base station, which target cell identity comprises the network node identity of the gateway node embedded in the target cell identity, and wherein the mask is to be used to derive the network node identity from the target cell identity, and
• transmitting the target cell identity and the mask to the source radio base station thereby enabling the source radio base station to identify the gateway node the target radio base station belongs to.

A method in a source radio base station for initiating a handover of a connection to a user equipment from a source cell to a target cell associated with a target cell identity, which source cell is served by the source radio base station, and which target cell is served by a target radio base station, wherein the target radio base station and the source radio base station are comprised in a radio communications network, and wherein the target radio base station is adapted to be connected to a gateway node associated with a network node identity, which gateway node is acting as a proxy for the target radio base station towards a core network and towards the source radio base station, the method is characterised in comprising

• receiving, on a radio channel from the user equipment, the target cell identity and a mask, which target cell identity comprises the network node identity of the gateway node embedded in the target cell identity, and wherein the mask is to be used to derive the network node identity from the target cell identity,
• deriving the network node identity embedded in the target cell identity using the mask, and
• initiating the handover of the connection to the user equipment from the source cell to the target cell based on the derived network node identity.

An target radio base station for enabling a handover of a connection to a user equipment from a source cell to a target cell associated with a target cell identity, which source cell is served by a source radio base station, and which target cell is served by the target radio base station, wherein the target radio base station and the source radio base station are comprised in a radio communications network, and wherein the target radio base station is adapted to be connected to a gateway node associated with a network node identity, which gateway node is acting as a proxy for the target radio base station towards a core network and towards the source radio base station, the target radio base station is characterised in comprising

• a broadcasting unit arranged to broadcast, periodically within the target cell on a radio channel to the user equipment, the target cell identity and a mask, wherein the target cell identity comprises the network node identity of the gateway node embedded in the target cell identity and the mask is to be used to derive the network node identity from the target cell identity.

A user equipment for enabling a handover of a connection to the user equipment from a source cell to a target cell associated with a target cell identity, which source cell is served by a source radio base station, and which target cell is served by the target radio base station, wherein the target radio base station and the source radio base station are comprised in a radio communications network, and wherein the target radio base station is adapted to be connected to a gateway node associated with a network node identity, which gateway node is acting as a proxy for the target radio base station towards a core network and towards the source radio base station, the user equipment characterised in comprising

• a receiving unit arranged to receive the target cell identity and a mask broadcasted within the target cell on a radio channel from the target radio base station, which target cell identity comprises the network node identity of the gateway node embedded in the target cell identity and the mask is to be used to derive the network node identity from the target cell identity, and a transmitting unit arranged to transmit the target cell identity and the mask to the source radio base station thereby enabling the source radio base station to identify the gateway node the target radio base station belongs to.

A source radio base station for initiating a handover of a connection to a user equipment from a source cell to a target cell associated with a target cell identity, which source cell is served by the source radio base station, and which target cell is served by the target radio base station, wherein the target radio base station and the source radio base station are comprised in a radio communications network, and wherein the target radio base station is adapted to be connected to a gateway node associated with a network node identity, which gateway node is acting as a proxy for the target radio base station towards a core network and towards the source radio base station, the source radio base station is characterised in comprising a receiving unit arranged to receive, on a radio channel from the user equipment, the target cell identity and a mask, which target cell identity comprises the network node identity of the gateway node embedded in the target cell identity and the mask is to be used to derive the network node identity from the target cell identity,

• a deriving unit arranged to derive the network node identity embedded in the target cell identity using the mask, and
• an initiating unit arranged to initiate the handover of the connection to the user equipment from the source cell to the target cell based on the derived network node identity.