Method and apparatus for device-to-device communication
First Claim
Patent Images
1. A method comprising:
- detecting, by a first user equipment, that a handover of an existing direct device-to-device connection between the first user equipment and a second user equipment is needed by detecting that the existing direct device-to-device connection is moving out of a current serving cell;
selecting at least one candidate target cell for the handover;
signalling an indication of the at least one candidate target cell to the second user equipment;
receiving, from the second user equipment, second user equipment-specific information related to the indicated at least one candidate target cell;
selecting the target cell on the basis of the received second user equipment-specific information; and
accessing the selected target cell for sending a request for the handover of the existing direct device-to-device connection,wherein the method is a method for initiating the handover of the existing direct device-to-device connection between the first and the second user equipment by the first user equipment.
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Abstract
A method of controlling device-to-device communications between user equipment, including using a network control element, which is common to a plurality of networks, including controlling any of the following functions: network access control functions, connection set-up, resource allocation, mode switching, handover, security and/or charging. Also a method of controlling handovers or connections in a device-to-device communications between a first and a second user equipment wherein the control is performed, at least in part, said first or second user equipments. Alternatively the user equipment may send reports a handover/connection is initiated/controlled based on said report.
14 Citations
16 Claims
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1. A method comprising:
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detecting, by a first user equipment, that a handover of an existing direct device-to-device connection between the first user equipment and a second user equipment is needed by detecting that the existing direct device-to-device connection is moving out of a current serving cell; selecting at least one candidate target cell for the handover; signalling an indication of the at least one candidate target cell to the second user equipment; receiving, from the second user equipment, second user equipment-specific information related to the indicated at least one candidate target cell; selecting the target cell on the basis of the received second user equipment-specific information; and accessing the selected target cell for sending a request for the handover of the existing direct device-to-device connection, wherein the method is a method for initiating the handover of the existing direct device-to-device connection between the first and the second user equipment by the first user equipment. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. An apparatus comprising:
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a transceiver; at least one memory including computer program code, and at least one processor, the at least one memory and the computer program code configured, with the at least one processor, to cause the apparatus, the apparatus being a first user equipment or being included in a first user equipment, to perform at least the following; initiating a handover of an existing direct device-to-device connection between the first and a second user equipment by; detecting that the handover of the existing device-to-device connection is needed by detecting that the existing direct device-to-device connection is moving out of a current serving cell; selecting at least one candidate target cell for the handover; signalling an indication of the at least one candidate target cell to the second user equipment; receiving, from the second user equipment, second user equipment-specific information related to the indicated at least one candidate target cell; selecting the target cell on the basis of the received second user equipment-specific information; and accessing the selected target cell for sending a request for the handover of the existing direct device-to-device connection. - View Dependent Claims (9, 10, 11, 12, 13, 14)
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15. A method comprising:
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detecting, by a first user equipment, that a handover of an existing direct device-to-device connection between the first user equipment and a second user equipment is needed by detecting that the existing direct device-to-device connection is moving out of a current serving cell; selecting at least one candidate target cell for the handover; signalling an indication of the at least one candidate target cell to the second user equipment; receiving, from the second user equipment, an indication of a proposed target cell selected by the second user equipment, wherein the proposed target cell minimizes the difference in a given parameter indicative of power between the first and second user equipments; selecting the proposed target cell as the target cell; and accessing the selected target cell for sending a request for the handover of the existing direct device-to-device connection, wherein the method is a method for initiating the handover of the existing direct device-to-device connection between the first and the second user equipment by the first user equipment.
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16. An apparatus comprising:
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a transceiver; at least one memory including computer program code, and at least one processor, the at least one memory and the computer program code configured, with the at least one processor, to cause the apparatus, the apparatus being a first user equipment or being included in a first user equipment, to perform at least the following; initiating a handover of an existing direct device-to-device connection between the first and a second user equipment by; detecting that the handover of the existing device-to-device connection is needed by detecting that the existing direct device-to-device connection is moving out of a current serving cell; selecting at least one candidate target cell for the handover; signalling an indication of the at least one candidate target cell to the second user equipment; receiving, from the second user equipment, an indication of a proposed target cell selected by the second user equipment, wherein the proposed target cell minimizes the difference in a given parameter indicative of power between the first and second user equipments; selecting the proposed target cell as the target cell; and accessing the selected target cell for sending a request for the handover of the existing direct device-to-device connection.
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Specification