System identification (SID) list for selecting operating frequencies
First Claim
1. A radio telephone subscriber unit arranged for use in a communication system having a plurality of frequencies divided into a plurality of available frequency bands, said radio telephone subscriber unit including a controller, said controller comprising:
- (a) means for scanning the radio frequencies in all available frequency bands;
(b) means for recording at least one received system identification number (SID) associated with each of said available frequency bands;
(c) means for comparing said received SIDs for each said available frequency band to a prioritized list of preferred SIDs stored in said radio telephone subscriber unit;
(d) means for selecting a single received SID based upon said prioritization of said list of preferred SIDs stored in said radio telephone subscriber unit so that a received SID with a highest prioritization is selected; and
(e) means for acquiring a radio frequency carrier corresponding to said selected single received SID.
10 Assignments
0 Petitions
Accused Products
Abstract
A cellular telephone system is upgraded by modifying subscriber units for selective service provider acquisition during roaming. Priority of acquisition is given to those service providers associated with the home service provider. These preferred service providers are identified by System Identification (SIDs) numbers. A roaming subscriber unit will tune to control frequencies to identify all of the system providers operating in a physical area to which the subscriber has roamed. The SIDs of those system providers available are compared to a list contained within the subscriber unit. Selection is made based upon a priority of those system providers having arrangements with the home system provider.
173 Citations
37 Claims
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1. A radio telephone subscriber unit arranged for use in a communication system having a plurality of frequencies divided into a plurality of available frequency bands, said radio telephone subscriber unit including a controller, said controller comprising:
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(a) means for scanning the radio frequencies in all available frequency bands; (b) means for recording at least one received system identification number (SID) associated with each of said available frequency bands; (c) means for comparing said received SIDs for each said available frequency band to a prioritized list of preferred SIDs stored in said radio telephone subscriber unit; (d) means for selecting a single received SID based upon said prioritization of said list of preferred SIDs stored in said radio telephone subscriber unit so that a received SID with a highest prioritization is selected; and (e) means for acquiring a radio frequency carrier corresponding to said selected single received SID. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 20)
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16. A method of selecting a system provider for a radio telephone communication on at least one of a plurality of radio frequency bands by a radio telephone subscriber unit, said method comprising the steps of:
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(a) scanning each of said available radio frequency bands; (b) recording at least one received system identification number (SID) associated with each of said radio frequency bands; (c) comparing said received SIDs for each said available radio frequency band to a prioritized list of preferred SIDs stored in said radio telephone subscriber unit; (d) selecting a single received SID based upon said prioritization of said list of preferred SIDs stored in said radio telephone subscriber unit so that received SID with a highest prioritization is selected; and (e) acquiring a radio frequency carrier corresponding to a control channel of said selected single received SID. - View Dependent Claims (17, 18, 19, 21, 22, 23, 24, 25)
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26. A registration system for a radio telephone communication system servicing a plurality of radio telephone subscriber units arranged for communication with a plurality of cell sites over a plurality of radio frequencies divided into frequency bands, said registration system comprising:
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(a) means for generating a System Identification Number (SID) associated with each radio telephone service provider in said radio telephone system; (b) means in each of said radio telephone subscriber units for scanning the radio frequencies in all available frequency bands in said radio telephone communication system; (c) means in each of said radio telephone subscriber units for recording at least one SID associated with each of said available frequency bands; (d) means for selecting a single received SID based upon a comparison of received SIDs with a prioritized list of preferred SIDs stored in said radio telephone subscriber units so that a received SID having a highest priority is selected; and (e) means for carrying out a communication function based upon said selected single received SID. - View Dependent Claims (27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37)
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Specification