Method of directing a call to a mobile telephone in a dual mode cellular satellite communication network
First Claim
1. A method of directing a call to a mobile telephone in a dual-mode cellular-satellite communications network, comprising the steps of:
- transmitting an alert signal to said mobile telephone using base stations of said cellular network if the mobile telephone is currently registered as active in a cellular network;
receiving said alert signal at said mobile telephone;
transmitting a response to said cellular network as an acknowledgement;
upon non-receipt of said acknowledgement by the cellular network within a defined period of time, transmitting a last known location of the mobile telephone from said cellular network to a satellite earth station; and
upon receipt of said last known location of the mobile telephone at said satellite earth station, using said last known location to determine a satellite antenna beam most likely to be received by said mobile telephone and transmitting an alert signal to said mobile telephone via a satellite using said antenna beam.
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Abstract
A method of directing a call to a mobile telephone in a dual mode cellular satellite communications network is disclosed. An alert signal is transmitted to the mobile telephone using base stations of the cellular network if the mobile telephone is currently registered as active in a cellular network. When the alert signal is received at the mobile telephone, the mobile telephone transmits a response to the cellular network as an acknowledgement. When an acknowledgement is not received by the cellular network within a defined period of time, the cellular network transmits the last known location of the mobile telephone to the satellite earth station. Upon receipt of the last known location of the mobile telephone, the satellite earth station using the last known location determines a satellite antenna beam most likely to be received by the mobile telephone and transmits an alert signal to the mobile telephone via the satellite using the antenna beam.
103 Citations
13 Claims
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1. A method of directing a call to a mobile telephone in a dual-mode cellular-satellite communications network, comprising the steps of:
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transmitting an alert signal to said mobile telephone using base stations of said cellular network if the mobile telephone is currently registered as active in a cellular network;
receiving said alert signal at said mobile telephone;
transmitting a response to said cellular network as an acknowledgement;
upon non-receipt of said acknowledgement by the cellular network within a defined period of time, transmitting a last known location of the mobile telephone from said cellular network to a satellite earth station; and
upon receipt of said last known location of the mobile telephone at said satellite earth station, using said last known location to determine a satellite antenna beam most likely to be received by said mobile telephone and transmitting an alert signal to said mobile telephone via a satellite using said antenna beam. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13)
receiving the alert signal at the mobile telephone; and
transmitting a response from said mobile telephone via said satellite acknowledging said alert signal.
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3. A method of directing a call according to claim 1, further comprising the steps of:
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receiving said acknowledgement transmitted via said satellite at the satellite earth station;
allocating a traffic channel for communicating with said mobile telephone and completing a two-way connection between said mobile telephone and a calling party.
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4. A method of directing a call according to claim 1, wherein said alert signal transmitted from the cellular network comprises a first attempt at a first power level and a second attempt at a higher power level in a likely paging area and simultaneously at said first power level in a wider paging area.
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5. A method of directing a call according to claim 1, wherein said alert signal transmitted from said cellular network comprises a first attempt transmitted in a last known paging area and a second attempt transmitted in a wider paging area.
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6. A method of directing a call according to claim 1, wherein said alert signal transmitted using said satellite antenna beam comprises a first attempt at first power levels and a second attempt at a higher power level.
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7. A method of directing a call according to claim 2, further comprising the step of:
upon non-receipt at a satellite earth station of said acknowledgement from said mobile telephone, transmitting a further attempt using said satellite in an extended satellite paging area.
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8. A method of directing a call according to claim 3, further comprising the step of:
transmitting an indication from said satellite earth station to a cellular network that the mobile telephone is reachable via said satellite earth station.
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9. A method of directing a call according to claim 1, wherein said alert signal transmitted from said cellular network comprises a first attempt at a first power level and a second attempt at a higher power level.
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10. A method of directing a call according to claim 7, wherein said extended satellite paging area comprises several beams.
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11. A method of directing a call according to claim 7, wherein said extended satellite paging area comprises a beam of wider bandwidth.
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12. A method of directing a call according to claim 7, further comprising the step of transmitting said further attempt in said first satellite paging area at an increased power level.
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13. A method of directing a call according to claim 7, further comprising the step of transmitting said further attempt in said first satellite paging area using increased error correcting coding.
Specification