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US 2011/0086639 A1Published application
Method and Apparatus for Handover Procedure in Communication Network with Relay Extension
AssigneeNokia Siemens Networks Oy
InventorsJyri Kalervo Hamalainen, Bernhard Raaf, Oumer Teyeb, Phan Vinh Van
Life of this patent
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Abstract
An enhanced solution for controlling a handover procedure for handing a terminal device over from a source cell to a target cell in a communication network with relay nodes is provided. In the solution, the relay nodes actively assist in the handover procedure by, for instance, initiating the handover procedure, configuring a relayed link and buffering user data at the relay node.
Claims33
A method, comprising:
- utilizing a handover procedure for handing a terminal device over from a source cell to a target cell;
- and
- receiving handover-related data from the terminal device at a source relay node,
- characterized by the method further comprising:
- determining, at the source relay node, the need for a handover of the terminal device from the source relay node to a target node on the basis of the received handover-related data;
- and
- initiating the handover procedure at the source relay node by transmitting a handover request to a source central node controlling the source relay node, if it has been determined that there is a need for the handover of the terminal device.
4 more elements
A method, comprising:
- utilizing a handover procedure for handing a terminal device over from a source cell to a target cell;
- receiving at a target central node controlling a target relay node a handover request from a source node;
- and
- allocating resources at the target central node for a communication link between the target central node and the target relay node after receiving the handover request from the source node, the resource allocation relating to an establishment of a communication link for the terminal device,
- characterized by the method further comprising:
- forwarding user data related to the terminal device at the target central node to the target relay node during the handover of the terminal device.
3 more elements
A method, comprising:
- utilizing a handover procedure for handing a terminal device over from a source cell to a target cell;
- and
- receiving at a target relay node controlled by a target central node user data related to the terminal device from the target central node,
- characterized by the method further comprising:
- allocating resources at the target relay node for a communication link between the target relay node and the terminal device if it has been determined that the terminal device can be handed over, the resource allocation relating to an establishment of a communication link for the terminal device;
- and
- buffering data received from the target central node at the target relay node until the handover for the terminal device is complete.
4 more elements
An apparatus, comprising:
- an interface configured to receive handover-related data from a terminal device,
- characterized by the apparatus further comprising:
- a controller configured to:
- determine the need for a handover of the terminal device from a source relay node to a target node on the basis of the received handover- related data;
- and
- initiate the handover for the terminal device by transmitting a handover request through the interface to a source central node controlling the source relay node, if it has been determined that there is a need for the handover of the terminal device.
3 more elements
An apparatus, comprising:
- an interface configured to receive a handover request from a source node;
- and
- a controller configured to allocate resources for a communication link between a target central node and a target relay node controlled by the target central node, after receiving the handover request from a source node, wherein the resource allocation relates to an establishment of a communication link for a terminal device,
- characterized by the controller being further configured to:
- forward user data related to the terminal device to the target relay node during the handover of the terminal device.
2 more elements
An apparatus, comprising
- an interface configured to receive user data related to a terminal device from a target central node,
- characterized by the apparatus further comprising a controller configured to:
- allocate resources to a communication link between the target relay node and the terminal device if it has been determined that the terminal device can be handed over, the resource allocation relating to an establishment of a communication link for the terminal device, the apparatus further comprising:
- a data buffer configured to buffer user data received from the target central node until the handover for the terminal device is complete.
1 more element
An apparatus, comprising:
- receiving means for receiving handover-related data from a terminal device,
- characterized by the apparatus further comprising controlling means for:
- determining the need for a handover of the terminal device from a source relay node to a target node on the basis of the received handover- related data;
- and
- initiating the handover for the terminal device by transmitting a handover request to a source central node controlling the source relay node, if it has been determined that there is a need for the handover of the terminal device.
2 more elements
An apparatus, comprising:
- receiving means for receiving a handover request from a source central node;
- and
- controlling means for allocating resources for a communication link between a target central node and a target relay node controlled by the target central node, after receiving the handover request from the source central node, wherein the resource allocation relates to an establishment of a communication link for a terminal device,
- characterized by the apparatus further comprising controlling means for:
- forwarding user data related to the terminal device to the target relay node during the handover of the terminal device.
2 more elements
An apparatus, comprising
- receiving means for receiving user data related to a terminal device from a target central node,
- characterized by the apparatus further comprising controlling means for:
- allocating resources for a communication link between the target relay node and the terminal device if it has been determined that the terminal device can be handed over, the resource allocation relating to an establishment of a communication link for the terminal device, the apparatus further comprising:
- storage means for buffering user data received from the target central node until the handover for the terminal device is complete.
1 more element
A system for controlling a handover of a terminal device from a source cell to a target cell, characterized by the system comprising an interface configured to receive handover-related data from a terminal device, and
- a controller configured to:
- determine the need for a handover of the terminal device from a source relay node to a target node on the basis of the received handover-related data;
- and
- initiate the handover for the terminal device by transmitting a handover request through the interface to a source central node controlling the source relay node, if it has been determined that there is a need for the handover of the terminal device;
- and an interface configured to receive a handover request from a source node;
- and
- a controller configured to allocate resources for a communication link between a target central node and a target relay node controlled by the target central node, after receiving the handover request from a source node, wherein the resource allocation relates to an establishment of a communication link for a terminal device, and
- forward user data related to the terminal device to the target relay node during the handover of the terminal device;
- and
- an interface configured to receive user data related to a terminal device from a target central node,
- allocate resources to a communication link between the target relay node and the terminal device if it has been determined that the terminal device can be handed over, the resource allocation relating to an establishment of a communication link for the terminal device, the apparatus further comprising:
- a data buffer configured to buffer user data received from the target central node until the handover for the terminal device is complete.
9 more elements
Dependencies are inferred from the claim text.