Telecommunications – Transmitter and receiver at separate stations – Plural transmitters or receivers
Reexamination Certificate
1998-06-26
2001-01-30
Le, Thanh Cong (Department: 2749)
Telecommunications
Transmitter and receiver at separate stations
Plural transmitters or receivers
C455S422100, C455S525000, C455S560000, C455S445000
Reexamination Certificate
active
06181948
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
This invention relates to radio base station receiving data transmission systems provided for uplink site diversity of mobile communication systems. This application is based on patent application No. Hei 9-174044 filed in Japan, the content of which is incorporated herein by reference.
2. Description of the Related Art
Conventionally, one kind of site diversity receiving method is disclosed by the paper of Japanese Patent Application, Publication No. Hei 7-107033, for example. This method is used for improvements of the communication quality, which is realized such that the same signal from a mobile station is received by multiple base stations rather than by a single base station.
FIG. 8
shows an example of a network configuration according to the conventional site diversity receiving method.
In
FIG. 8
, a mobile station
130
is placed in communicating states with multiple base stations
230
-
1
to
230
-L. Signals received by the base stations are subjected to selection and composition at a diversity composition node
220
, an output of which is forwarded to a mobile communication network
210
and is then sent to a network
200
such as PSTN (an abbreviation for “Public Switched Telephone Network”) or ISDN (an abbreviation for “Integrated Service Digital Network”).
FIG. 9
shows an example of a frame format used between a radio base station and a base station control device in accordance with the conventional method.
In the case of the site diversity that performs communication using three radio base stations, it is necessary to provide three lines of a frame format
400
, which consists of a frame number, error detection information, error frequency and receiving data. Herein, 335 bits are provided for one line, so it is necessary to provide a capability of transmitting 1,005 bits for three lines.
The aforementioned conventional technology suffers from the following problem.
In the site diversity, receiving data are transferred from the multiple radio base stations to the base station control device, wherein a diversity effect is obtained by selecting error-free data in the receiving data. In order to perform transfer of the receiving data from the multiple radio base stations to the base station control device, it is necessary to provide a number of lines, which corresponds to a number of radio base stations that are used to establish the site diversity between the radio base stations and base station control device. In the case of the uplink site diversity using three radio base stations, it is necessary to provide three lines, for example.
Because, each radio base station does not evaluate quality of the receiving data thereof, so it merely transmits correct receiving data as well as wrong receiving data to the base station control device.
SUMMARY OF THE INVENTION
It is an object of the invention to provide a radio base station receiving data transmission system which is capable of establishing uplink site diversity of a mobile communication system with a reduced number of lines.
A radio base station receiving data transmission system is provided for uplink site diversity of a mobile communication system that is configured by a mobile station, radio base stations, a base station control device and a mobile communication exchange. Herein, the mobile station establishes the uplink site diversity using the radio base stations under control of the base station control device.
Now, each of the radio base stations that are connected to the mobile station to receive its signals performs error detection on receiving data thereof so as to produce error information with respect to each frame. The error information contains error detection information representing occurrence of error in the receiving data and an error frequency representing a degree of error contained in the receiving data. Firstly, the base station control device receives the error information from each of the radio base stations regarding the uplink site diversity. On the basis of the error information, the device detects a radio base station that firstly reports non-error detection result within the radio base stations, or the device selects a radio base station whose amount of error in receiving data is the smallest within the radio base stations. Thus, the device requests such a radio base station to transmit its receiving data thereto. So, the receiving data are further transmitted from the base station control device to the mobile communication exchange.
Because of the above, it is possible to reduce a number of lines that are required between the radio base station and base station control device, for example. In addition, it is possible to reduce a total amount of communications required to perform the uplink site diversity.
REFERENCES:
patent: 4395768 (1983-07-01), Goethals et al.
patent: 5574983 (1996-11-01), Douzono et al.
patent: 5729536 (1998-03-01), Doshi et al.
patent: 5809430 (1998-09-01), D'Amico
patent: 5867791 (1999-02-01), Chambert
patent: 5896397 (1999-04-01), Tolhuizen
patent: 5896570 (1999-04-01), Saunders et al.
patent: 57-170633 (1982-10-01), None
patent: 64-77332 (1989-03-01), None
patent: 3-50921 (1991-03-01), None
patent: 3-255733 (1991-11-01), None
patent: 5-29993 (1993-02-01), None
patent: 5-145457 (1993-06-01), None
patent: 7-107033 (1995-04-01), None
patent: 8-116313 (1996-05-01), None
Andrew J. Viterbi, “CDMA Principles of Spread Spectrum Communication”.
Cong Le Thanh
McGuireWoods LLP
NEC Corporation
Woldetatios Yemane
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