Multiplex communications – Communication over free space – Having a plurality of contiguous regions served by...
Patent
1996-04-10
1998-12-15
Chan, Jason
Multiplex communications
Communication over free space
Having a plurality of contiguous regions served by...
370337, 370342, 370347, 370350, 370514, 375201, H04J 1302
Patent
active
058503927
ABSTRACT:
In a time division multiple access (TDMA) radiotelephone communications system, a spread spectrum random access channel signal representing a random access message is communicated from a radiotelephone to a central station according to a spreading sequence. In response, a TDMA radiotelephone communications channel is assigned to the radiotelephone. A time division multiplexed radiotelephone communications signal is communicated between the radiotelephone and the central station on the assigned TDMA radiotelephone communications channel over a time division multiplexed carrier frequency band. Preferably, in communicating the spread spectrum random access channel signal, a random access channel signal, representing the random access channel message, is direct sequence modulated according to the spreading sequence to produce a direct sequence modulated random access channel signal. According to a two-stage detection aspect, a synchronization sequence may be associated with a plurality of spreading sequences. The synchronization sequence may be first detected from the communicated spread spectrum random access channel signal, and in response to detection of the synchronization sequence, one of the plurality of spreading sequences associated with the detected synchronization sequence may be detected. A station identification may be assigned to the radiotelephone, with the station identification preferably represented by a digital station identification word. The synchronization sequence and the spreading sequence may be identified from the station identification word, thus associating the synchronization and spreading sequences. The spreading sequence may also be randomly generated from the station identification word.
REFERENCES:
patent: 3818453 (1974-06-01), Schmidt et al.
patent: 4555782 (1985-11-01), Alaria et al.
patent: 5172375 (1992-12-01), Kou
patent: 5373502 (1994-12-01), Turban
patent: 5481533 (1996-01-01), Honig et al.
patent: 5533013 (1996-07-01), Leppanen
patent: 5572516 (1996-11-01), Miya et al.
patent: 5577024 (1996-11-01), Malkamaki et al.
patent: 5640413 (1997-06-01), Ichihara
patent: 5663990 (1997-09-01), Bolgiano et al.
M. Mouly and M.B. Pautet, The GSM System For Mobile Communications, Radio Resource Management, 1992, pp. 368-372.
Carlo Caini et al., A Spectrum-and Power-Efficient EHF Mobile Satellite System to be Ingrated with Terrestial Cellular Systems, IEEE Journal On Selected Areas In Communications, vol. 10, No. 8, Oct. 1992, pp. 1315-1325.
M. Kawai et al., Randam TDMA Access Protocol with Application to Multi Beam Satelites, IEEE International Conference on Communications, Conference Record Vol. 3 of 3, ICC'82 The Digital Revolution, ISSN 0536-1486, IEEE Catalog Number 82CH1766-5, Jun. 13-17, 1982, pp. 7F.3.1-7F.3.5.
Giuliano Benelli et al., Integration of Random Access and TDMA Techniques in a Multibeam Satellite System, IEEE Global Telecommunications Conference, Conference Record vol. 2 of 3, "Communications In The Information Age", IEEE #84CH2064-4, LC84-81785, Nov. 26-29, 1984, pp. 28.7.1-28.7.4.
U.S. Patent Application Serial No. 08/626182, filed Mar. 29, 1996, entitled "Circuit and Method for Initiating Communication Between Communication Stations of a Radio Communication System".
PCT International Search Report , PCT/US97/05584, Oct. 02, 1997.
Hassan Amer
Massingill Larry W.
Reinhold Stanley L.
Wang Yi-Pin Eric
Chan Jason
Ericsson Inc.
Vu Huy D.
LandOfFree
Spread spectrum random access systems and methods for time divis does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Spread spectrum random access systems and methods for time divis, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Spread spectrum random access systems and methods for time divis will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-1463031