Multiplex communications – Wide area network – Packet switching
Patent
1994-09-16
1996-09-24
Chin, Wellington
Multiplex communications
Wide area network
Packet switching
370 941, 370 951, 370 953, 455 531, H04B 724
Patent
active
055597955
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
The invention relates to a method and a system for a dynamically alternating radio station.
In systems utilizing a TDMA frame structure, that is time division with or without resource sharing i the space each system is divided into subsystems. Resource sharing in time and space of a common frequency band for spread out subscribers in a radio network provides a possibility for several stations to cooperate and to function simultaneously at a specific frequency band. Each radio network comprises several central stations (CS) and peripheral stations (PS) connected to and working under said central stations. Each central station and associated peripheral stations constitute a subsystem. The systems function in different embodiments in time duplex or frequency duplex with some kind of time frame structure, for instance TDMA. In different system implementations the structure is determined with regard to transmission delay and to the application information in each time frame. The capacity demand decides the number of time slots in each time frame, etc. Such systems are disclosed in PCT/89/SE/00470, PCT/SE90/00681 and PCT/SE91/526.
Said documents do not disclose any systems providing repeating radio functions, radio network branching structures, CS-CS-communication, frame synchronization, functions that will all allow the utilization of a specific frequency band by only one radio transmitter and one radio receiver. Furthermore, no method is disclosed for arranging communication and transfer information between different CS that do not terminate at common station location.
Other existing wide area radio systems functioning according to TDM/TDMA in frequency duplex in fixed applications are fox: instance SR 500 manufactured by SR Telecom, Kanada and other similar systems functioning according to a time division principle having repeating functions. Systems of this type work in TDM mode from a central station or a repeating station towards peripheral stations in a continous mode. From peripheral stations towards a central station or a repeating station the communication is handled in "bursts", i.e. time divided into time slots between peripheral stations that under each central station and repeating station shares a specific frequency that is unique in each cell or sector. In such systems a repeating station is a repeating station during all time intervals. Repeating, splitting between two radio hops is in these systems accomplished by an exchange of frequency. In such cases a double arrangement of equipment and different frequencies are required.
SUMMARY OF THE INVENTION
An object of the present invention is to provide a method and a system for changing the mode of operation for stations functioning with a TDMA frame structure in radio communication networks having central stations and peripheral stations changing of mode of operation as a central station to a peripheral station within each time frame to create improved radio network properties and functions. The method and system will provide several new possibilities to establish telecommunication networks that are more flexible, economical and safe. Such local wireless telecommunication networks can be provided outside buildings in wide area radio networks in urban or rural environment, or in more local applications within buildings, offices etc. The new functional properties of radio stations in radio networks are provided by combining stations having two basic states. One and the same station can operate as a central station and/or a peripheral station and/or a repeating station. Thereby it is possible to establish CS-CS communication in a smooth way without redundant intermediate stations. PS-CS to CS-PS communication will provide a repeating function having a possible constant delays, etc. Said properties are created dynamically during different time intervals by utilizing basically the same units such as antenna, radio, modem, control units each of which is controlled in different states. The results of exchange of mode of op
REFERENCES:
patent: 3745462 (1973-07-01), Trimble
patent: 4107609 (1978-08-01), Gruenberg
patent: 4144496 (1979-03-01), Cunningham et al.
patent: 4169214 (1979-09-01), Stump
patent: 4414661 (1983-11-01), Karlstrom
patent: 4517669 (1985-05-01), Freeburg et al.
patent: 4541121 (1985-09-01), Blum
patent: 4625308 (1986-11-01), Kim et al.
patent: 4633463 (1986-12-01), Mack
patent: 4686672 (1987-08-01), Namiki
patent: 4688218 (1987-08-01), Blineau et al.
patent: 4696053 (1987-09-01), Mastriani et al.
patent: 4698803 (1987-10-01), Haselton et al.
patent: 4755992 (1988-07-01), Albal
patent: 4759051 (1988-07-01), Han
patent: 4775999 (1988-10-01), Williams
patent: 4785450 (1988-11-01), Bolgiano et al.
patent: 4833701 (1989-05-01), Comroe et al.
patent: 5239671 (1993-08-01), Linquist et al.
patent: 5263177 (1993-11-01), Schieve et al.
patent: 5285443 (1994-02-01), Patsiokas et al.
patent: 5313461 (1974-05-01), Ahl et al.
patent: 5448570 (1995-09-01), Toda et al.
Cox et al., "Dynamic Channel Assignmentin High-Capacity Mobile Communications Systems," The Bell System Technical Journal, 50, 1833-1855 (1971).
Chin Wellington
Inventahl AB
LandOfFree
Method in a TDMA radiosystem to let a central station communicat does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Method in a TDMA radiosystem to let a central station communicat, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Method in a TDMA radiosystem to let a central station communicat will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-1935072