Satellite-based messaging system transmitting during guard band of satellite-based telephone system and method of operation thereof
First Claim
1. In a system comprising a plurality of addressable call receivers, a plurality of mobile transceivers, said receivers and mobile transceivers being on or near the surface of the earth, and a plurality of satellite transceivers in orbits about the earth, a method of operating said system comprising the steps of:
- (a) said mobile transceivers transmitting first voice information to said satellite transceivers during a first recurring time period;
(b) said satellite transceivers transmitting second voice information to said mobile transceivers during a second recurring time period;
(c) providing a third recurring time period between the end of said second time period and the beginning of said first time period in which said satellite transceivers transmit paging information to said addressable call receivers, the duration of said third time period being sufficient to allow for said paging information transmitted by said satellite transceivers during said third period to propagate past all satellites which are visible to the transmitting satellite transceivers to avoid interference between said paging information transmitted by said satellite transceivers during said third period and the first voice information previously transmitted by said mobile transceivers; and
(d) said satellite transceivers transmitting in synchronism with one another their respective paging information to said addressable call receivers during said third time period.
3 Assignments
0 Petitions
Accused Products
Abstract
A satellite-based, world-wide cellular messaging system transmits paging messages to pagers. The messages are transmitted during a guard-band time-slot of a compatible world-wide cellular telephone system. In order to achieve better penetration, the satellites boost their transmit power for paging messages. One or more paging carrier frequencies may be used to accommodate differences in paging demand among different terrestrial cells.
31 Citations
16 Claims
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1. In a system comprising a plurality of addressable call receivers, a plurality of mobile transceivers, said receivers and mobile transceivers being on or near the surface of the earth, and a plurality of satellite transceivers in orbits about the earth, a method of operating said system comprising the steps of:
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(a) said mobile transceivers transmitting first voice information to said satellite transceivers during a first recurring time period; (b) said satellite transceivers transmitting second voice information to said mobile transceivers during a second recurring time period; (c) providing a third recurring time period between the end of said second time period and the beginning of said first time period in which said satellite transceivers transmit paging information to said addressable call receivers, the duration of said third time period being sufficient to allow for said paging information transmitted by said satellite transceivers during said third period to propagate past all satellites which are visible to the transmitting satellite transceivers to avoid interference between said paging information transmitted by said satellite transceivers during said third period and the first voice information previously transmitted by said mobile transceivers; and (d) said satellite transceivers transmitting in synchronism with one another their respective paging information to said addressable call receivers during said third time period. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. A system for broadcasting messages to a plurality of addressable call receivers and for transceiving information to an from a plurality of mobile transceivers, said receivers and mobile transceivers being on or near the surface of the earth, said system comprising:
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a plurality of satellite transceivers in orbits about the earth; means for synchronizing the operation of said addressable call receivers and transceivers, wherein said mobile transceivers transmit first voice information to said satellite transceivers during a first recurring time period, and wherein said satellite transceivers transmit second voice information to said mobile transceivers during a second recurring time period; means within said satellite transceivers for transmitting paging information to said addressable call receivers during a third recurring time period between the end of said second time period and the beginning of said first time period, the duration of said third time period being sufficient to allow for said paging information transmitted by said satellite transceivers during said third period to propagate past all satellites which are visible to the transmitting satellite transceivers to avoid interference between said paging information transmitted by said satellite transceivers during said third period and the first voice information previously transmitted by said mobile transceivers; and means within said satellite transceivers for transmitting, in synchronism with one another, their respective paging information to said addressable call receivers during said third time period. - View Dependent Claims (10, 11, 12, 13, 14, 15, 16)
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Specification