Multiplex communications – Pathfinding or routing – Switching a message which includes an address header
Reexamination Certificate
1998-04-17
2001-05-29
Chin, Wellington (Department: 2664)
Multiplex communications
Pathfinding or routing
Switching a message which includes an address header
C370S431000, C370S447000
Reexamination Certificate
active
06240092
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Technical Field
This invention relates to a decentralized radiocommunications system as set forth in the preamble of claim
1
and to a radio station therefor.
2. Discussion of Related Art
DE 39 08 940 A1 discloses a decentralized radiocommunications systems with a number of radio stations. Each of the radio stations has at least one neighboring radio station with which it is in direct radio communication. The prior-art radiocommunications system makes available several pairs of channels for duplex transmission between the radio stations. To ensure reliable radiocommunication, prior to the establishment of a radio link, each radio station checks all channels to determine whether they are free, and creates a so-called channel occupancy list. Then, a radio link is established to a neighboring radio station on a free channel. If the neighboring radio station is not a destination station but is to serve as a relay station, it will evaluate its channel occupancy list to establish a radio link to a further radio station. This makes it possible to establish so-called radio chains. In the radiocommunications system described in DE 39 08 940 A1, however, each radio station must check all channels prior to the establishment of a radio link, i.e., each station must include a scanning receiver. In addition, a radio chain can be established in the prior-art radiocommunications system only if a free pair of channels is found for each of the radio links, i.e., if several radio frequencies are available.
SUMMARY OF THE INVENTION
It is an object of the invention to provide a radiocommunications system having radio stations of simple construction. The establishment of radio links is to be independent of whether the radiocommunications system is a multifrequency system or a single-frequency system.
In accord with a first aspect of the invention, a decentralized radiocommunications system comprising a number of radio stations (N
1
to N
7
), each radio station (N
3
) having at least one neighboring radio station (N
2
; N
4
) with which it is in direct radio communication, characterized in that all radio stations (N
1
to N
7
) transmit radio signals with respective identifications (I
1
to I
7
) assigned to them, and that each radio station (N
3
) includes a memory which holds a first list (LA
3
) with identifications (I
2
, I
4
) which said radio station (N
3
) receives directly from the at least one neighboring radio station (N
2
; N
4
), and a second list (LB
3
) with identifications (I
3
, I
1
; I
3
, I
5
) which the at least one neighboring radio station (N
2
; N
4
) receives directly from radio stations (N
3
, N
1
; N
3
, N
5
) neighboring said at least one neighboring radio station and routes to said radio station (N
3
).
According to a second aspect of the invention, a decentralized radiocommunications system as claimed in claim
1
, characterized in that the second list (LB
3
) also contains identifications (I
2
, I
4
, I
5
, I
6
, I
7
) which other radio stations (N
1
, N
5
, N
6
, N
7
) receive and route via the at least one neighboring radio station (N
2
; N
4
) to said radio station (N
3
).
According to the invention, each radio station transmits radio signals with an identification assigned to it and includes a memory which holds a first list with those identifications which said radio station receives directly from the at least one neighboring radio station, and a second list with those identifications which the at least one neighboring radio station receives directly from its neighboring radio stations and routes to said radio station.
In this manner, current lists are stored in each radio station which indicate to which neighboring radio stations a direct radio link can be established and to which other radio stations an indirect radio link can be established. Since identifications are registered and stored, no channel-scanning receivers are necessary. The radiocommunications system can also be a single-frequency system.
These and other objects, features and advantages of the present invention will become more apparent in light of the following detailed description of a best mode embodiment thereof, as illustrated in the accompanying drawing.
REFERENCES:
patent: 5640384 (1997-06-01), Du
patent: 6122250 (2000-09-01), Taniguchi
patent: 3503308 (1985-08-01), None
patent: 3908940 (1990-09-01), None
patent: 3918697 (1990-12-01), None
patent: 4335265 (1994-04-01), None
patent: 19518754 (1995-12-01), None
Alcatel
Chin Wellington
Pham Brenda
LandOfFree
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