Neighboring cell list generation in a mobile satellite communication system
First Claim
1. A method of operating a mobile station in a satellite communication system wherein the mobile station is capable of communicating alternatively with a first satellite or a second satellite of the satellite communication system, the method comprising:
- on a plurality of occasions, receiving a set neighboring cell data transmitted in a broadcast from one of the first and second satellites, the set comprising first and second data portions relating to communication with the first and second satellites, respectively;
upon a first of the plurality of occasions, decoding the first and second data portions; and
upon subsequent ones of the plurality of occasions, decoding only a selected one of the first and second data portions.
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Accused Products
Abstract
A mobile communication system has a plurality of satellites and mobile stations. A mobile station is capable of communicating with more than one satellite. A satellite transmits a set of neighboring cell data to one of the mobile stations. The data set comprises first and second portions related to communication with a first and a second satellite of the plurality of satellites, respectively. When the data set is received the first time by the mobile station, it decodes both first and second data portions to establish a neighboring cell list, which is stored within the mobile station. When the mobile station receives subsequent transmissions of neighboring cell data, it need only decode either the first data portion or the second data portion based on the presence or absence of an alert message.
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Citations
19 Claims
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1. A method of operating a mobile station in a satellite communication system wherein the mobile station is capable of communicating alternatively with a first satellite or a second satellite of the satellite communication system, the method comprising:
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on a plurality of occasions, receiving a set neighboring cell data transmitted in a broadcast from one of the first and second satellites, the set comprising first and second data portions relating to communication with the first and second satellites, respectively; upon a first of the plurality of occasions, decoding the first and second data portions; and upon subsequent ones of the plurality of occasions, decoding only a selected one of the first and second data portions. - View Dependent Claims (2, 3, 4, 5)
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6. A mobile station in a satellite communication system having a plurality of satellites, the mobile station comprising:
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a receiver capable of communicating alternatively with a first satellite or a second satellite of the plurality of satellites, the receiver receiving a set of neighboring cell data transmitted in a broadcast from one of the first and second satellites on a plurality of occasions, the received data set comprising first and second data portions relating to communication with the first and second satellites, respectively; and a decoder to decode the received data set, the decoder configured to decode the first and second data portions upon a first of the plurality of occasions that the receiver receives the data set, and to decode only a selected one of the first and second data portions upon subsequent ones of the plurality of occasions that the receiver receives the data set. - View Dependent Claims (7, 8, 9, 10)
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11. A method of operating a mobile station in a satellite mobile telephone system, the method comprising the steps of:
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decoding all of a set of neighbouring cell data transmitted in a broadcast channel to generate a neighbouring cell list; making signal measurements for the cells in said list and a current serving cell; decoding a portion only of the set of neighbouring cell data transmitted in the broadcast channel and modifying the neighbouring cell list in dependence thereon; and making signal measurements for the cells in said modified list and the current serving cell. - View Dependent Claims (12, 13, 14, 15, 16)
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17. A method of operating a mobile satellite telephone system comprising the steps of:
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transmitting neighbouring cell data in a broadcast channel, the neighbouring cell data comprising a first portion relating to cells served by a first satellite in an orbit having a first plane and a second portion relating to cells served by a second satellite in an orbit having a second, different plane; and transmitting neighbouring cell data in the broadcast channel, wherein the second portion of the cell data being modified in dependence on the relative motion of the first and second satellites. - View Dependent Claims (18, 19)
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Specification