Telecommunications system
First Claim
1. A portable unit for use in a telecommunications system having one or more system base units, said portable unit comprising:
- a signal receiving and transmitting device for receiving and transmitting radio signals;
a system identification device connected to said signal receiving and transmitting device for determining whether a received signal is a valid signal transmitted by one of the base units of the telecommunications system;
a recipient identification device for determining whether the received signal is intended for said portable unit;
a timing device connected to said recipient identification device for monitoring a time lapse since a signal intended for said portable unit was received; and
an automatic registration request generator connected to said timing device for generating a registration request when a received signal is a valid signal not intended for said portable unit and the time lapse is greater than a predetermined period.
13 Assignments
0 Petitions
Accused Products
Abstract
A telecommunications system having at least one base unit and a plurality of portable units is arranged to enable automatic re-registration of a portable unit with the system. The portable unit includes system and unit identity detectors and a registration sequence generator. The registration sequence generator is connected to a timer which monitors the elapse of time since a signal from a base unit of the system intended for the portable unit is received. The registration sequence generator generates a re-registration request in the event the monitored elapse of time is greater than a predetermined period and a signal from a base unit of the system is received which is not intended for the portable unit. With the system described portable units can automatically re-register with the system after being out of range of a base unit without the need for a separate beacon signal.
39 Citations
15 Claims
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1. A portable unit for use in a telecommunications system having one or more system base units, said portable unit comprising:
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a signal receiving and transmitting device for receiving and transmitting radio signals; a system identification device connected to said signal receiving and transmitting device for determining whether a received signal is a valid signal transmitted by one of the base units of the telecommunications system; a recipient identification device for determining whether the received signal is intended for said portable unit; a timing device connected to said recipient identification device for monitoring a time lapse since a signal intended for said portable unit was received; and an automatic registration request generator connected to said timing device for generating a registration request when a received signal is a valid signal not intended for said portable unit and the time lapse is greater than a predetermined period. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
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13. A telecommunications system for transmitting and receiving radio signals between one or more portable units and at least one system base unit, each of said portable units comprising:
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a signal receiving and transmitting device for receiving and transmitting radio signals; a system identification device connected to said signal receiving and transmitting device for determining whether a received signal is a valid signal transmitted by one of the system base units; a recipient identification device for determining whether the received signal is intended for a respective said portable unit; a timing device connected to said recipient identification device for monitoring a time lapse since a signal intended for the respective said portable unit was received; and an automatic registration request generator connected to said timing device for generating a registration request when a received signal is a valid signal not intended for the respective said portable unit and the time lapse is greater than a predetermined period.
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14. A method of automatic registration of a portable unit in a telecommunications system comprising:
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monitoring radio signals received by the portable unit; determining whether a received signal is a valid signal from a base unit of the telecommunications system; determining whether the received signal is intended for the portable unit; monitoring a time lapse since receipt of the last valid signal intended for the portable unit and determining whether the time lapse is greater than a predetermined period; and generating an automatic registration request when a valid signal not intended for the portable unit is received and the time lapse is greater than the predetermined period. - View Dependent Claims (15)
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Specification