Universal wireless radiotelephone system
First Claim
1. A method of selectively operating a mobile subscriber handset in a wide service area and in a local service area system:
- comprising the steps of;
initializing a mobile radiotelephone upon power turn on by;
investigating if local service is enabled;
investigating if cellular service is enabled if local service has not been enabled;
determining which service is enabled and acquiring a valid channel for radiotelephone communications;
checking for a valid system ID with the local/cellular service that is enabled;
establish an active call state with the local/cellular service that is enabled; and
when transiting from a local area to a wide area service area;
transferring service from a local service area to a wide area service area by a handoff operation which includes the steps of;
detecting an impairment in signal strength of a call in progress;
providing notification to a handset user of a desirability of a hand-off;
enabling the handset user to initiate and control an occurrence of the desired hand-off;
retuning the handset in response to user enabling to acquire a cellular set up channel while continuing to communicate with the local service area station;
detecting a page from a wide service area station and issuing a page response from the handset;
assigning a voice channel in the wide area system and tuning the handset to that channel.
5 Assignments
0 Petitions
Accused Products
Abstract
A universal wireless radiotelephone communication apparatus is operative in both a first radiotelephone communication system including a first base station having a wide area of coverage, transmitting radiotelephone signals at a first band of frequencies and in a second radiotelephone communication system including a second base station having a localized area of coverage, transmitting radiotelephone signals at a second band of frequencies higher than said first band of frequencies. The second band of frequencies is optimally selected with an offset of less than twice a frequency contained within said first band. The wireless radiotelephone communication apparatus has a common baseband circuitry for operating with both the first base station covering the wide area and with the second base station covering the local area, the common baseband circuitry processing received radiotelephone signals from both base stations and processes signals generated by a user of the handset for transmission to either of these base stations.
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Citations
6 Claims
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1. A method of selectively operating a mobile subscriber handset in a wide service area and in a local service area system:
comprising the steps of; initializing a mobile radiotelephone upon power turn on by; investigating if local service is enabled; investigating if cellular service is enabled if local service has not been enabled; determining which service is enabled and acquiring a valid channel for radiotelephone communications; checking for a valid system ID with the local/cellular service that is enabled; establish an active call state with the local/cellular service that is enabled; and when transiting from a local area to a wide area service area;
transferring service from a local service area to a wide area service area by a handoff operation which includes the steps of;detecting an impairment in signal strength of a call in progress; providing notification to a handset user of a desirability of a hand-off; enabling the handset user to initiate and control an occurrence of the desired hand-off; retuning the handset in response to user enabling to acquire a cellular set up channel while continuing to communicate with the local service area station; detecting a page from a wide service area station and issuing a page response from the handset; assigning a voice channel in the wide area system and tuning the handset to that channel. - View Dependent Claims (2, 3, 4, 5, 6)
Specification