Selective call system and a secondary station for use therein
First Claim
1. A selective call system comprising:
- a controller;
at least one base station coupled to said controller, said at least one base station comprises a transmitter, said controller comprises means for encoding data message signals at a higher bit rate than a bit rate of address signals of an at least one secondary station; and
at least one secondary station, said at least one secondary station comprises signal receiving means, decoding means coupled to the receiving means, control means which, in response to identifying an address code word, adapts said at least one secondary station to receive a higher bit rate message signal, and means for equalising the higher bit rate message signal in non-real time.
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0 Petitions
Accused Products
Abstract
A selective call system comprises at least one base station which transmits address code words at a predetermined data rate. High rate telescript information having a length of more than 500 characters, for example, an E-mail message, is transmitted at a data rate greater than that used for sending address code words. In the event of the system comprising a simulcast system, intersymbol interference (ISI) may occur and in order to reduce the effects of ISI on the decoding the telescript information while avoiding an unnecessarily large drain on a secondary station'"'"'s batteries, the telescript information as received for a specific secondary station is stored and subsequently equalized in non-real time. The secondary station can comprise a mobile terminal unit and may include a transmitter for transmitting acknowledgement or other response signals, for example, such as spread spectrum signals. The acknowledgement signals may be used for locating the mobile terminal unit.
18 Citations
31 Claims
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1. A selective call system comprising:
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a controller; at least one base station coupled to said controller, said at least one base station comprises a transmitter, said controller comprises means for encoding data message signals at a higher bit rate than a bit rate of address signals of an at least one secondary station; and at least one secondary station, said at least one secondary station comprises signal receiving means, decoding means coupled to the receiving means, control means which, in response to identifying an address code word, adapts said at least one secondary station to receive a higher bit rate message signal, and means for equalising the higher bit rate message signal in non-real time. - View Dependent Claims (2)
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3. A selective call system comprising:
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a controller; at least one base station coupled to said controller, said at least one base station comprises a transmitter, said controller comprises means for encoding data message signals at a higher bit rate than a bit rate of address signals of an at least one secondary station; and at least one secondary station, said at least one secondary station comprises signal receiving means, decoding means coupled to the receiving means, and control means which adapts said at least one secondary station to receive a higher bit rate message signal transmitted by a base station in response to identifying an address code word, and causes the message signal to be equalised in non-real time in response to receiving a higher bit rate message signal. - View Dependent Claims (4)
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5. A selective call system comprising:
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a controller, at least one base station coupled to the controller, the base station having a transmitter for transmitting signals at preselected, predetermined bit rates, and at least one secondary station having a receiver for receiving signals transmitted by the at least one base station, the at least one secondary station being responsive to the receipt of at least two address code words, each of said address code words including indicia indicating a respective bit rate of a data message signal, wherein the controller has means for formatting encoded data message signals as an address code word and concatenated data message code words, and means for selecting an address code word indicating a transmission bit rate of the concatenated data message code words which transmission bit rate is higher than the transmission bit rate of the address code word, and wherein the at least one secondary station further comprises decoding means and control means, said decoding means coupled to said receiver, and wherein said control means in response to determining said indicia in a received address code word causes the decoding means to adapt itself to receive the concatenated higher bit rate message code words. - View Dependent Claims (6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22)
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23. A selective call system comprising:
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a controller, at least one base station coupled to the controller, the base station having a transmitter for transmitting signals at preselected, predetermined bit rates, and at least one secondary station having a receiver for receiving signals transmitted by the at least one base station, the at least one secondary station having at least two addresses, each of said addresses including indicia indicating a respective bit rate of a concatenated data message signal, wherein the controller has means for formatting encoded data message signals as an address code word and concatenated data message code words, and means for selecting an address code word indicating a transmission bit rate of the concatenated data message code words which transmission bit rate is higher than the transmission bit rate of the address code word, and wherein the at least one secondary station further comprises decoding means coupled to the receiving means, control means responsive to determining said indicia in a received address code word for causing the decoding means to adapt itself to receive the concatenated higher bit rate message code words, and means for equalizing the higher bit rate message code words in non-real time.
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24. A selective call system comprising:
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a controller, at least one base station coupled to the controller, the base station having a transmitter for transmitting signals at preselected, predetermined bit rates, and at least one secondary station having a receiver for receiving signals transmitted by the at least one base station, the at least one secondary station being responsive to the receipt of at least two address code words, each of said address code words including indicia indicating a respective bit rate of a data message signal, wherein the controller has means for formatting encoded data message signals as an address code word and concatenated data message code words, and means for selecting an address code word indicating a transmission bit rate of the concatenated data message code words which transmission bit rate is higher than the transmission bit rate of the address code word, and wherein the at least one secondary station further comprises decoding means coupled to the receiver, control means for causing the decoding means to adapt itself to receive the concatenated higher bit rate message code words, means for equalizing the higher bit rate message code words in non-real time, means for determining the end of the last of the concatenated higher bit rate message code words, and means responsive to said determination for initiating the equalization of the higher bit rate message code words.
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25. A secondary station for use in selective call system comprising:
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a controller, and at least one base station coupled to the controller, the base station having a transmitter for transmitting signals at preselected, predetermined bit rates to the secondary station, said secondary station being responsive to the receipt of at least two address code words, each of said address code words including indicia indicating a respective bit rate of a data message signal, wherein the controller has means for formatting encoded data message signals as an address code word and concatenated data message code words, and means for selecting an address code word indicating a transmission bit rate of the concatenated data message code words which transmission bit rate is higher than the transmission bit rate of the address code word, and wherein the secondary station comprises a receiver for receiving signals transmitted by the at least one base station, decoding means coupled to the receiver, and control means for causing the decoding means to adapt itself to receive the concatenated higher bit rate message code words in response to determining said indicia in a received address code word. - View Dependent Claims (26, 27, 28, 29)
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30. A secondary station for use in selective call system comprising:
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a controller, and at least one base station coupled to the controller, the base station having a transmitter for transmitting signals at preselected, predetermined bit rates to the secondary station which is responsive to the receipt of at least two address code words, each of said address code words including indicia indicating a respective bit rate of a data message signal, wherein the controller has means for formatting encoded data message signals as an address code word and concatenated data message code words, and means for selecting an address code word indicating a transmission bit rate of the concatenated data message code words which transmission bit rate is higher than the transmission bit rate of the address code word, and wherein the secondary station comprises a receiver for receiving signals transmitted by the at least one base station, decoding means coupled to the receiver, control means for causing the decoding means to adapt itself to receive the concatenated higher bit rate message code words, and means for equalizing the higher bit rate message code words in non-real time.
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31. A secondary station for use in selective call system comprising:
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a controller, and at least one base station coupled to the controller, the base station having a transmitter for transmitting signals at preselected, predetermined bit rates to the secondary station which is responsive to the receipt of at least two address code words,, each of said address code words including indicia indicating a respective bit rate of a concatenated data message signal, wherein the controller has means for formatting encoded data message signals as an address code word and concatenated data message code words, and means for selecting an address code word indicating a transmission bit rate of the concatenated data message code words which transmission bit rate is higher than the transmission bit rate of the address code word, and wherein the secondary station comprises a receiver for receiving signals transmitted by the at least one base station, decoding means coupled to the receiver, control means for causing the decoding means to adapt itself to receive the concatenated higher bit rate message code words, means for equalizing the higher bit rate message code words in non-real time, means for determining the end of the last of the concatenated higher bit rate message code words, and means responsive to said determination for initiating the equalization of the higher bit rate message code words.
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Specification