Method for determining timing advance during handover
AssigneeAlcatel Mobile Communication France
InventorPierre Dupuy
Life of this patent
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Abstract
A method of handover between two cells of a TDMA cellular mobile radio network, wherein, after a mobile receives a handover command (HANDOVER CMD) from its base station, the mobile transmits a message (SABM) containing connection set-up information or wanted data to a new base station according to a timing advance. The handover command tells the mobile not to transmit access bursts to the new base station, thus avoiding speech interruption. The timing advance is determined by the mobile or communicated to the mobile in the handover command.
Claims19
A method for handover of a communication link with a mobile from an old base transceiver station of a first cell of a cellular mobile radio network to a new base transceiver station of a second cell of the cellular mobile radio network, the method comprising the steps of
- receiving at said mobile a handover command;
- instructing, in said handover command, said mobile not to transmit access bursts to said new base transceiver station
- determining, by said mobile, a new timing advance with which said mobile must delay transmission of its messages to said new base transceiver station if said new timing advance is not communicated to said mobile in said handover command;
- and
- without transmitting access bursts, transmitting from said mobile a message containing connection set up information or wanted data to said new base transceiver station, said message being transmitted using said new timing advance.
Base station controller for implementation of a method for handover of a communication link with a mobile from an old base transceiver station of a first cell of a cellular mobile radio network to a new base transceiver station of a second cell of the cellular mobile radio network, the method comprising the steps of:
- receiving at said mobile a handover command;
- instructing, in said handover command, said mobile not to transmit access bursts to said new base transceiver station;
- determining, by said mobile, a new timing advance with which said mobile must delay transmission of its messages to said new base transceiver station if said new timing advance is not communicated to said mobile in said handover command;
- and, without transmitting access bursts, transmitting from said mobile a message containing connection set up information or wanted data to said new base transceiver station, said message being transmitted using said new timing advance, the base station controller comprising:
- a control unit for a plurality of base transceiver stations for producing and transmitting handover commands on the occasion of handover, said commands instructing the mobiles not to transmit access bursts.
Dependencies are inferred from the claim text.