Multiplex communications – Communication over free space – Having a plurality of contiguous regions served by...
Reexamination Certificate
1998-11-23
2002-11-12
Kizou, Hassan (Department: 2662)
Multiplex communications
Communication over free space
Having a plurality of contiguous regions served by...
C370S312000, C709S202000, C709S239000, C709S243000, C709S241000
Reexamination Certificate
active
06480480
ABSTRACT:
BACKGROUND OF THE INVENTION
The invention relates to a local area network for wireless transmission of control and user information between a plurality of terminals and a terminal working as a controller, i.e. a candidate-controller terminal, which candidate-controller terminal is provided for controlling the communication in the local area network.
A wireless local area network is understood to mean a network comprising a plurality of terminals between which control and user information is transmitted in a wireless manner. A wireless transmission is used for transmitting information, for example, by radio, ultrashell or infrared channels.
The wireless local area network defined above is known from “Contention-free MAC protocol for Wireless ATM LAN” by C. Y. Ngo et al.; ACTS Mobile Communications Summit 1997, pp. 728-733, October 1997, Aalborg, Denmark, and comprises a plurality of terminals. One terminal works as a controller and controls the communication between the terminals. For data transmission in the asynchronous transfer mode (ATM), cells in this network are inserted into user time slots or user channels and transmitted via a radio transmission medium.
SUMMARY OF THE INVENTION
It is an object of the invention to provide a wireless local area network in which data relating to communication between the terminals are not lost even in the case of a failure of the controller.
The object is achieved by a wireless local area network of the type defined in the opening paragraph in that at least a further not candidate-controller terminal can be used as a controller and in that the candidate-controller terminal is provided for receiving all the control information necessary for controlling the communication in the local area network.
The local area network according to the invention has three types of terminals. One terminal works as a controller, several terminals can be used as a controller after the current controller has failed or has been switched off, and further terminals cannot be used as a controller. In order that a seamless transition to a new controller is possible after the failure or the switch-off of the current controller and the data so far recovered from the control information by the current controller are not lost, these data are also collected in databases of the candidate-controller terminal after the control information has been processed.
Claims
2
and
3
relate to various groups of control information and the storing of data in databases which data to be stored are recovered from the control information. Claims
4
to
6
show that in case of failure or switch-off of the controller a seamless transition from an old to a new controller is possible. Claim
7
explains the various transmission possibilities of control and user information. Claim
8
shows that the invention also relates to a candidate-controller terminal.
REFERENCES:
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patent: 5371734 (1994-12-01), Fischer
patent: 5546397 (1996-08-01), Mahany
patent: 5572528 (1996-11-01), Shuen
patent: 5682379 (1997-10-01), Mahany et al.
patent: 5805807 (1998-09-01), Hanson et al.
patent: 6195705 (2001-02-01), Leung
Raychaudhuri et al., “WATMNET: A Protype Wireless ATM System for Multimedia Personal Communication”, IEEE Journal on Selected Areas in Communications, Bd. 15, Nr. 1, Jan. 1997, pp. 83-95, XP 000637401.
Du Y et al., “System Architecture of a Home Wireless ATM Network”, 1996 IEEE International Conference on Universal Personal Communications Record, gateway to the 21stCentury, Cambridge, MA, Sep. 29-Oct. 2, 1996, NR. Conf., pp. 477-481, XP 002110817.
“On Architectures for Broadband Wireless Systems” by S. Jiang et al., IEEE Communications Magazine, Oct. 1997, pp. 132-140.
“Contention-Free MAC Protocol for Wireless ATM LAN”, by C.Y. Ngo et al., ACTS Mobile Communications Summit 1997, pp. 728-733, Oct. 1977, Aalborg, Denmark.
“Computer Networks” by Andrew S. Tanenbaum, second edition, Prentice-Hall International Inc., 1988, pp. 117-131; 196-212 and 262-265.
Kizou Hassan
Piotrowski Daniel J.
Yin Lu
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