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US 4,811,380 AGranted
Cellular radiotelephone system with dropped call protection
AssigneeMotorola, Inc.
InventorStephen L. Spear
Life of this patent
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AssigneeMotorola, Inc.
InventorStephen L. Spear
Estimating the term…
An improved cellular telephone communication system is described having operational steps which prevent a call from being dropped due to a radiotelephone not receiving a handoff instruction from its host base site. The system includes a switch controller for determining that the radiotelephone requires a handoff from a first base site coverage area to a second base site coverage area and for communicating a handoff message to the associated first and second base site equipment. The first base site equipment then transmits the handoff message to the radiotelephone. If the radiotelephone does not receive the message, it determines that the call has been lost, siezes a signalling channel from the second base site, and requests, via the second base site a call reconnection by transmitting a special message. The second base site then informs the radiotelephone of the handoff instruction and the handoff is completed with a successful reconnection of the call.
A cellular radiotelephone communication system having at least first base site equipment and second base site equipment with associated radiotelephone communication coverage areas and a switch controller for connecting radiotelephone communication with the base site equipment, wherein at least one radiotelephone is initially in an active call within the coverage area of the first base site equipment, comprising:
A radiotelephone for use in a cellular radiotelephone communication system having at least first base site equipment and second base site equipment with associated coverage areas and a switch controller for connecting radiotelephone communication with the base site equipment, wherein radiotelephones are capable of communicating while in transition between the aforesaid coverage areas and wherein the radiotelephone is initially in an active call on a channel within the coverage area of the first base site equipment, comprising:
A switch controller for connecting radiotelephones with communication equipment in a cellular radiotelephone communication system having at least first base site equipment and second base site equipment with associated communication coverage areas, wherein a radiotelephone is initially in an active call on a channel within the coverage area of the first base site equipment, comprising:
A base site controller for use in a cellular radiotelephone communication system having at least first base site equipment and second base site equipment with associated coverage areas and a switch controller for connecting radiotelephone communication with the base site equipment, wherein a radiotelephone is initially in an active call and the switch controller has determined that a handoff of the call is required from the coverage area of the first base site equipment to the coverage area of the second base site equipment, comprising:
A cellular radiotelephone communication system having at least first base site equipment and second base site equipment with associated radiotelephone communication coverage areas and a switch controller for connecting radiotelephone communication with the base site equipment, wherein at least one radiotelephone is in an active call on a channel within the coverage area of the first base site equipment and in transition to the coverage area of the second base site equipment, comprising:
For use by a cellular radiotelephone communication system having at least first base site equipment and second base site equipment with associated radiotelephone communication coverage areas and a switch controller for connecting radiotelephone communication with the base site equipment, wherein at least one radiotelephone is initially in an active call within the coverage area of the first base site equipment, a method of recovering a lost call, comprising the steps of:
For use in a cellular radiotelephone communication system having at least first base site equipment and second base site equipment with associated coverage areas and a switch controller for connecting radiotelephone communication with the base site equipment, wherein radiotelephones are capable of communicating while in transition between the aforesaid coverage areas and wherein the radiotelephone is initially in an active call on a channel within the coverage area of the first base site equipment, a method of recovering a lost call by a radiotelephone, comprising the steps of:
For use by a switch controller which connects radiotelephones with communication equipment in a cellular radiotelephone communication system having at least first base site equipment and second base site equipment with associated communication coverage areas, wherein a radiotelephone is initially in an active call on a channel within the coverage area of the first base site equipment, a method of recovering a lost call, comprising:
For use by a base site controller within a cellular radiotelephone communication system having at least first base site equipment and second base site equipment with associated coverage areas and a switch controller for connecting radiotelephone communication with the base site equipment, wherein a radiotelephone is initially in an active call and the switch controller has determined that a handoff of the call is required from the coverage area of the first base site equipment to the coverage area of the second base site equipment, a method of recovering a lost call, comprising:
For use by a cellular radiotelephone communication system having at least first base site equipment and second base site equipment with associated radiotelephone communication coverage areas and a switch controller for connecting radiotelephone communication with the base site equipment, wherein at least one radiotelephone is in an active call on a channel within the coverage area of the first base site equipment and in transition to the coverage area of the second base site equipment, a method of recovering a lost call, comprising the steps of:
Dependencies are inferred from the claim text.