Methods and nodes for fast handover using pre-allocation of resources in target nodes

2:

• The method according to claim 1, wherein pre-allocating resources for handover of the user equipment to the at least one target cell candidate comprises for each of a plurality of target cell candidates:
• sending a request for handover of the user equipment to the target cell candidate, wherein the request is sent to a radio base station controlling the target cell candidate;
• and when the handover request is acknowledged:
• receiving a response from the radio base station controlling the target cell candidate, the response comprising a dedicated random access preamble.

6:

• The method according to claim 1, preceded by:
• determining a position of the user equipment;
• and
• determining a second list of neighbour cells based on statistical data related to handovers performed at the determined position,
• wherein resources for handover of the user equipment are pre-allocated for at least one target cell candidate within the determined second list of neighbour cells.

7:

• A method in a radio base station of a wireless network, for supporting handover of a user equipment, wherein the radio base station controls a target cell candidate for the handover, the method comprising:
• receiving a request for handover of the user equipment to the target cell candidate, wherein the request is received from a radio base station controlling the cell serving the user equipment;
• determining whether there are available resources for the user equipment, the resources comprising a dedicated random access preamble for the target cell candidate;
• and when there are available resources:
• allocating the resources for the user equipment;
• initiating a timer when allocating the resources;
• and
• sending a response to the request, to the radio base station controlling the cell serving the user equipment, the response comprising the dedicated random access preamble.

10:

• A radio base station of a wireless network, configured to support handover of a user equipment and to control the serving cell of the user equipment, the radio base station comprising:
• a processing circuit;
• a receiver;
• and
• a transmitter,
• wherein:
• the processing circuit is configured to pre-allocate resources for handover of the user equipment to at least one target cell candidate, wherein the pre-allocated resources comprise a dedicated random access preamble for each at least one target cell candidate;
• the receiver is configured to receive a measurement report from the user equipment, the measurement report triggering a handover of the user equipment and comprising a first list of neighbour cells;
• the processing circuit is configured to determine if a cell in the first list of neighbour cells corresponds to one of the at least one target cell candidates;
• and
• the transmitter is configured to transmit a handover command to the user equipment comprising the dedicated random access preamble for the corresponding target cell candidate, when the cell in the first list of neighbour cells corresponds to one of the at least one target cell candidates.

15:

• The radio base station according to claim 10, wherein the processing circuit is further configured to:
• determine a position of the user equipment;
• determine a second list of neighbour cells based on statistical data related to handovers performed at the determined position;
• and
• pre-allocate resources for handover of the user equipment, for at least one target cell candidate within the determined second list of neighbour cells.

16:

• A radio base station of a wireless network configured to support handover of a user equipment and to control a target cell candidate for the handover, the radio base station comprising:
• a communication unit;
• and
• a processing circuit,
• wherein:
• the communication unit is configured to receive a request for handover to the target cell candidate for the user equipment, from a radio base station controlling the cell serving the user equipment;
• the processing circuit is configured to determine whether there are available resources for the user equipment, the resources comprising a dedicated random access preamble for the target cell candidate;
• the processing circuit is further configured to allocate the resources for the user equipment when there are available resources;
• the processing circuit is further configured to initiate a timer when allocating the resources;
• and
• the communication unit is further configured to send a response to the request to the radio base station controlling the cell serving the user equipment, the response comprising the dedicated random access preamble.