Telecommunications – Radiotelephone system – Zoned or cellular telephone system
Reexamination Certificate
1998-06-25
2001-05-01
Maung, Nay (Department: 2744)
Telecommunications
Radiotelephone system
Zoned or cellular telephone system
C455S446000, C455S561000
Reexamination Certificate
active
06226518
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to a cellular radio communication system having base stations constructed in the form of a daisy chain and a method of controlling data transmission using the system. In particular, the present invention relates to a cellular radio communication system having base stations constructed in the form of a daisy chain and a method of controlling data transmission using the system whereby data communications with a plurality of base stations as well as data communications among the respective base stations can be performed using a single base station controller and shared transmission lines in a specified area wherein expressways or railroads are constructed, and wherein the traffic amount is relatively small, but the whole service area is relatively large in comparison to a thickly-populated downtown area.
2. Discussion of the Related Art
Generally, cellular radio communication systems have been developed in preferential consideration of downtown areas having relatively a large amount of telephone traffic. Accordingly, the form of each cell has mainly been designed as a star type. At the center of such a star type cell is provided a base station controller which is linked to a plurality of base stations through dedicated trunk lines of the corresponding base station.
However, due to the continuous development of the mobile radio communication techniques, the number of subscribers of the mobile radio communication networks have been continuously increased. Under the circumstances, the subscribers demand that they achieve call communications anywhere in their country or in specified areas. Practically, the call communications between the subscribers of the mobile radio communication networks have been abruptly increased especially during their travels by trains or by taking highway. Accordingly, researches and efforts to extend the whole service area of the radio communication system with a short construction period and an inexpensive maintenance have been continuously made by industrialists of the radio communication system.
However, if the conventional star type cell is applied to the area in which expressways or railroads are constructed, and in which the traffic amount is relatively small, but the whole service area is relatively large in comparison to a thickly-populated downtown area, the service effectiveness is not so good in contrast with the expenses invested in equipment of the communication system.
Considering the above-described circumstances, if a cellular radio communication system is employed, whereby data communications with a plurality of base stations as well as data communications among the respective base stations can be performed using a single base station controller and a single shared transmission line in a specified area wherein expressways or railroads are constructed, and in which the traffic amount is relatively small, but the whole service area is relatively large in comparison to a thickly-populated downtown area, the expenses of equipping and maintaining the communication system as well as the construction period will be greatly reduced.
SUMMARY OF THE INVENTION
Accordingly, the present invention is directed to a cellular radio communication system having base stations constructed in the form of a daisy chain and a method of controlling data transmission using the system that substantially obviates one or more of the problems due to limitations and disadvantages of the related art.
An object of the present invention is to provide a cellular radio communication system having base stations constructed in the form of a daisy chain whereby data communications with a plurality of base stations as well as data communications among the respective base stations can be performed using a single base station controller and shared transmission lines in a specified service area that is relatively large in comparison to a downtown area.
Another object of the present invention is to provide a method of controlling data transmission which can heighten the transmission efficiency of the whole data by arbitrating the output of data produced from its own base station provided in a cellular radio communication system having base stations constructed in the form of a daisy chain and the output of data to be transmitted from a plurality of lower base stations to upper base stations.
Additional features and advantages of the invention will be set forth in the description which follows, and in part will be apparent from the description, or may be learned by practice of the invention. The objectives and other advantages of the invention will be realized and attained by the structure particularly pointed out in the written description and claims hereof as well as the appended drawings.
To achieve these and other advantages and in accordance with the purpose of the present invention, as embodied and broadly described, the cellular radio communication system having base stations constructed in the form of a daisy chain, comprises a base station controller provided in a specified region of a determined service area, and a plurality of base stations linked in series to the base station controller through trunk lines, wherein data communications between the base station controller and each of the base stations and data communications among the base stations are performed through the trunk lines.
It is preferable that each of the base stations provided in the cellular radio communication system according to the present invention has a data transmission control device which comprises a first interface for matching a voltage level of data, which is transmitted from a lower base station through the trunk line, to its own base station, a second interface for matching a voltage level of data, which is transmitted to an upper base station or to the base station controller, to the trunk line, a packet bus for receiving and transmitting input data to an internal processor board provided in its own base station and outputting data generated from its own base station, a lower channel memory for storing the data outputted from the first interface and exchanging data with the packet bus if necessary, a daisy channel memory for storing data identical to that stored in the lower channel memory if the data outputted from the first interface is to be transmitted to the upper base station, an upper channel memory for storing the data generated from its own base station if the data is to be transmitted to the upper base station, and an arbitrator for performing arbitration so that the data stored in the daisy channel memory and/or the upper channel memory is selectively outputted through the trunk line.
In another aspect of the present invention, there is provided a method of controlling data transmission in a cellular radio communication system having a base station controller provided in a determined service area and a plurality of base stations constructed in the form of a daisy chain and linked in series to the base station controller through trunk lines, the method comprising the steps of storing a first data transmitted from a lower base station and a second data to be outputted from its own base station if the data is transmitted from its own base station to an upper base station or to the base station controller, discriminating whether the data to be transmitted to the upper base station or to the base station controller exists at least in one memory provided in its own base station, and performing arbitration so that the respective stored data are selectively outputted in accordance with the frequency of assert signals produced from its own base station if it is discriminated that the data to be transmitted exists at least in one memory.
It is to be understood that both the foregoing general description and the following detailed description are exemplary and explanatory and are intended to provide further explanation of the invention as claimed.
REFERENCES:
patent: 5408514 (1995-04-01), Sakamoto et al.
pat
Contee Joy
Fleshner & Kim LLP
LG Information & Communications Ltd.
Maung Nay
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