Data transmission method and base station system

Details Data transmission method and base station system Data transmission method and base station system

1999-03-09

2002-11-19

Kizou, Hassan (Department: 2662)

Multiplex communications

Communication over free space

Combining or distributing information via time channels

C370S463000, C370S466000, C370S469000, C370S528000, C370S395100

Reexamination Certificate

active

06483830

ABSTRACT:

FIELD OF THE INVENTION
The invention relates to a method of transmitting radio interface information over a bidirectional data link between a base station and a base station controller, said radio interface information comprising signalling information, user information and error control information, and said method comprising inserting the signalling information and user information into ATM cells.
BACKGROUND OF THE INVENTION
FIG. 1
shows a radio system comprising a fixed part
100
and portable part
130
. The fixed part comprises a base station
110
and base station controller
120
. The fixed part
100
also comprises a network system and network management system, which are not shown since they are not relevant to the present problem. Between the base station
110
and the portable part
130
there is a bidirectional radio link
140
, over which radio interface information is transmitted. The radio interface information comprises signalling information, user information and error control information. The devices of the system use the signalling information to signal with one another and with devices not shown (e.g. the mobile switching centre). The user information is proper payload, e.g. user's speech or data. The base station
110
preprocesses the information, after which it is transmitted to the base station controller
120
.
In the systems of the prior art the signalling information and user information included in the radio interface information are separated from each other in means
116
in the base station
110
, whereby the signalling information is transmitted to means
112
and the user information to means
114
. Correspondingly, the base station controller
120
comprises means
122
for processing signalling information, means
124
for processing user information and means
126
for recombining the signalling information with the user information. There are separate data links in use between the base station
110
and the base station controller
120
: a bidirectional data link
142
for transmitting signalling information and a bidirectional data link
144
for transmitting user information.
The prior art arrangement described above has several disadvantages. If the data links
142
,
144
described are not only logically but also physically separate, extra costs will arise from this. It is necessary that both the base station
110
and base station controller
120
have two sets of means
112
,
114
,
122
,
124
for processing separate pieces of information. This increases the production costs of the devices
110
,
120
in question. Additional control information has to be transmitted over the data links
142
,
144
in order to manage the separate pieces of information, which complicates the processing needed in the base station
110
and base station controller
120
. In case the means
112
in the base station
110
, which are used for processing the signalling information, have some information on the contents of the signalling information or user information (e.g. if the means
112
have functionality with respect to layer
2
of the OSI. (Open Systems Interconnection) model of the ISO, i.e. the data link layer), it is necessary to change all the base stations
110
, if the signalling is altered. This causes considerable maintenance costs for the operator during the use of the system.
BRIEF DESCRIPTION OF THE INVENTION
The object of the invention is to provide a method of transmitting radio interface information over a bidirectional data link between a base station and a base station controller by means of which the disadvantages of the prior art solutions can be obviated.
This is achieved with the method set forth in the introduction. The method is characterized in that the radio interface information is compressed to fit into at least one ATM (Asynchronous Transfer Mode) cell by replacing the original error control information of the radio interface information with simple status information.
The invention also relates to a system for transmitting radio interface information over a bidirectional data link between a base station and a base station controller, said radio interface information comprising signalling information, user information and error control information, the signalling information and user information being inserted into ATM cells in said system.
The system is characterized in that the base station and base station controller comprise means for compressing the radio interface information to fit into at least one ATM cell by replacing the original error control information of the radio interface information with simple status information.
The method of the invention has several significant advantages. Only one set of means is needed in the base station and base station controller for transmitting the signalling information and user information. According to the invention, the radio interface information is compressed to fit into at least one ATM cell by replacing the original error control information of the radio interface information with simple status information. This is possible since the ATM data link is assumed to be so reliable that it is not necessary to transmit the original error control information of the radio interface information over the ATM data link. The error correction mechanisms of the ATM data link are sufficient. Hence, the structure of the base station and base station controller will be simpler and less expensive, and in addition both the devices will be smaller. The processing needed is much simpler in the base station and base station controller. The signalling information and user information are processed in the base station controller. It is no longer necessary to alter base stations when new signallings are introduced. This allows significant savings on costs for the operator. The invention allows the use of the transmission methods enabled by the ATM, e.g. statistical multiplexing by means of which it is possible to save on costs arising from the construction and/or use of transmission lines. One embodiment of the invention is the DECT-PABX (Digital European Cordless Telephone, Private Automatic Branch Exchange) system, which uses an ATM-based LAN (Local Area Network) as the transmission path.
The advantages of the system of the invention are the same as those described above in connection with the method. Preferred embodiments and other more detailed embodiments of the invention highlight its advantages. It is obvious that preferred embodiments may be combined with detailed embodiments in different ways so as to achieve the desired technical effect.


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A copy of the International Search Report for PCT/FI97/00611.

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