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US5436904A
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Mobile communication system
Assignee: Alcatel Lucent NV
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Filing: 1993-08-06
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Granted: 1995-07-25
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Expires: 2013-08-06
Abstract
Abstract The present mobile communication system includes a base station (BAS) and at least one mobile subscriber station (MOB) having a modulator (COM, SPM, DPEM, QPSKM, KSM) able to modulate a carrier wave with a request for access signal, and a transmitter (A3, DCM, ANTM) to transmit the thus obtained modulated carrier wave to the base station (BAS) during a time slot of a time division multiple access structure (TDS). The modulator is a linear digital modulator (COM, SPM, DPEM, QPSKM, KSM) which, prior to modulating the carrier wave with the request for access signal, modulates a pre-access carrier wave in such a way that a substantially constant envelope output signal is obtained during a subslot (SS1/SS6) of a time slot (SI). In a further embodiment the mobile subscriber stations are arranged in groups, to which distinct groups of time slots of said time division multiple access structure (TDS) are assigned, and each of the mobile subscriber stations (MOB) is allowed to launch a request for access in a time slot of the assigned group only.
Inventors
- 👤 Eric M. L. M. Pequet
- 👤 Serge C. C. Raes
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 09:05
CPC Classifications
H; H04; H04L; H04L27/00; H04B; H04B7/00; H04B7/24; H04B7/26; H04B7/2643; H04W; H04W74/00; H04W74/08
Claims Analysis
Total Claims: 19
Claim 1
Independent Claim
122 words
Mobile communication system with a base station and at least one mobile subscriber station including modulation means for modulating a carrier wave with a request for access signal for providing a modulated carrier wave, and transmission means for transmitting the modulated carrier wave to said base station during a time slot period of a synchronized time division multiple access time structure known at the base station and the mobile subscriber station, wherein said modulation means is a linear digital modulation means which, prior to modulating said carrier wave with said request for access signal, modulates a pre-access carder wave in such a way that a substantially constant envelope output signal is obtained during a time subslot period of said time slot period.
Claim 2
Dependent Claim
122 words
Mobile communication system with a base station and at least one mobile subscriber station including modulation means for modulating a carrier wave with a request for access signal for providing a modulated carrier wave, and transmission means for transmitting the modulated carrier wave to said base station during a time slot period of a synchronized time division multiple access time structure known at the base station and the mobile subscriber station, wherein said modulation means is a linear digital modulation means which, prior to modulating said carrier wave with said request for access signal, modulates a pre-access carder wave in such a way that a substantially constant envelope output signal is obtained during a time subslot period of said time slot period.
Claim 3
Dependent Claim
56 words
Mobile communication system according to claim 1, wherein said modulation means modulates said pre-access carrier wave during said time subslot period with a periodic bitstream for providing a modulated pre-access carrier wave and then filters the modulated pre-access carrier wave so as to obtain a substantially pure sinusoidal signal constituting said substantially constant envelope output signal.
Claim 4
Dependent Claim
37 words
Mobile communication system according to claim 1, wherein said base station includes means for detecting, upon reception of said substantially constant envelope output signal, the time subslot within which said substantially constant envelope output signal was transmitted.
Claim 5
Dependent Claim
76 words
Mobile communication system according to claim 3, wherein said modulation means modulates said pre-access carrier wave during said time subslot period with a periodic bitstream for providing a modulated pre-access carder wave and then filters the modulated pre-access carrier wave so as to obtain a substantially pure sinusoidal signal constituting said substantially constant envelope output signal, and wherein said means for detecting said time subslot period also detects the frequency of said substantially pure sinusoidal signal.
Claim 6
Dependent Claim
43 words
Mobile communication system according to claim 1, wherein said time slot period includes at least one time subslot period for transmitting a linearly modulated signal with a non-constant envelope, and at least one time subslot period for transmitting said substantially constant envelope signal.
Claim 7
Dependent Claim
14 words
Mobile communication system according to claim 4, wherein said frequency corresponds to control information.
Claim 8
Dependent Claim
21 words
Mobile communication system according to claim 2, wherein said digital linear modulation means includes a digital linear modulator and a filter.
Claim 9
Dependent Claim
19 words
Mobile communication system according to claim 7, wherein said digital linear modulator is a multiple phase shift keying modulator.
Claim 10
Dependent Claim
25 words
Mobile communication system according to claim 8, wherein said differential multiple phase shift keying modulator is a π/4 shifted differential quadrature phase shift keying modulator.
Claim 11
Dependent Claim
15 words
Mobile communication system according to claim 7, wherein said filter is a Kaiser window filter.
Claim 12
Dependent Claim
63 words
Mobile communication system according to claim 1, wherein said system includes plural mobile subscriber stations arranged in groups to which distinct groups of time slot periods of said synchronized time division multiple access time structure are assigned, and that each of said mobile subscriber stations is able to launch said request for access in a time slot period of an assigned group only.
Claim 13
Dependent Claim
62 words
Mobil communication system according to claim 11 wherein said synchronized time division multiple access time structure is divided into successive time slot periods, said successive time slot periods being further divided into an integral number (n) of groups, each successive time slot period being assigned a group number between 1 and n, time slot periods having identical group numbers constituting said groups.
Claim 14
Dependent Claim
125 words
Mobile communication system with a base station and a plurality of mobile subscriber stations including modulation means for modulating a carrier wave with a request for access signal for providing a modulated carder wave, and transmission means for transmitting the modulated carrier wave to said base station during a time slot period of a synchronized time division multiple access time structure known at the base station and the mobile subscriber stations, wherein said mobile subscriber stations are arranged in groups to which distinct groups of time slot periods of said synchronized time division multiple access time structure are assigned, and that each of said mobile subscriber stations is able to launch said request for access in a time slot period of an assigned group only.
Claim 15
Dependent Claim
125 words
Mobile communication system with a base station and a plurality of mobile subscriber stations including modulation means for modulating a carrier wave with a request for access signal for providing a modulated carder wave, and transmission means for transmitting the modulated carrier wave to said base station during a time slot period of a synchronized time division multiple access time structure known at the base station and the mobile subscriber stations, wherein said mobile subscriber stations are arranged in groups to which distinct groups of time slot periods of said synchronized time division multiple access time structure are assigned, and that each of said mobile subscriber stations is able to launch said request for access in a time slot period of an assigned group only.
Claim 16
Dependent Claim
112 words
Method for requesting access from a mobile subscriber station to a base station, comprising the steps of: launching a request for access modulated on an access carrier wave from said mobile subscriber station to said base station within a time slot period of a synchronized time division multiple access time structure known at the base station and the mobile subscriber station, wherein said access carder wave is linearly modulated, and wherein, preceding the above mentioned step of launching, said method includes the step of: modulating a pre-access carrier wave in such a way that a substantially constant envelope output signal is obtained during a time subslot period of said time slot period.
Claim 17
Dependent Claim
112 words
Method for requesting access from a mobile subscriber station to a base station, comprising the steps of: launching a request for access modulated on an access carrier wave from said mobile subscriber station to said base station within a time slot period of a synchronized time division multiple access time structure known at the base station and the mobile subscriber station, wherein said access carder wave is linearly modulated, and wherein, preceding the above mentioned step of launching, said method includes the step of: modulating a pre-access carrier wave in such a way that a substantially constant envelope output signal is obtained during a time subslot period of said time slot period.
Claim 18
Dependent Claim
127 words
Method for requesting access from at least one of a plurality of mobile subscriber stations to a base station, comprising the steps of: launching a request for access modulated on an access carrier wave from said mobile subscriber station to said base station within a time slot period of a synchronized time division multiple access time structure known at the base station and the mobil subscriber station, wherein said method includes the initial step of: arranging said mobile subscriber stations in groups, to which distinct groups of time slot periods of said synchronized time division multiple access time structure are assigned, and wherein each of said mobile subscriber stations is allowed to launch said request for access in a time slot period of an assigned group only.
Claim 19
Dependent Claim
127 words
Method for requesting access from at least one of a plurality of mobile subscriber stations to a base station, comprising the steps of: launching a request for access modulated on an access carrier wave from said mobile subscriber station to said base station within a time slot period of a synchronized time division multiple access time structure known at the base station and the mobil subscriber station, wherein said method includes the initial step of: arranging said mobile subscriber stations in groups, to which distinct groups of time slot periods of said synchronized time division multiple access time structure are assigned, and wherein each of said mobile subscriber stations is allowed to launch said request for access in a time slot period of an assigned group only.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1998-07-24 | 1999-01-23 | 1999-07-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2002-07-24 | 2003-01-23 | 2003-07-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2006-07-24 | 2007-01-23 | 2007-07-25 | $7700.00 | Window Closed / Lapsed |