Telecommunications – Transmitter and receiver at same station – Radiotelephone equipment detail
Patent
1996-09-19
1999-01-19
Dolinar, Andrew M.
Telecommunications
Transmitter and receiver at same station
Radiotelephone equipment detail
455561, 370336, H04Q 724
Patent
active
058624929
DESCRIPTION:
BRIEF SUMMARY
This application claims benefit of international application PCT/F195/00003 filed Jan. 3, 1995.
FIELD OF THE INVENTION
The invention relates to a mobile communication system comprising base stations, a mobile services switching center, a digital transmission system connecting the base stations to the mobile services switching center, and a network termination of an ISDN basic rate access.
BACKGROUND OF THE INVENTION
In mobile communication or mobile telephone networks of the prior art, a base station (BTS) of the network is connected to a base station controller (BSC) either by the use of a digital data link connection of 2048 kbit/s, with altogether 32 time slots of 64 kbit/s, or only some of those time slots.
The problem with the solutions of the prior art has been the high expenses: for a base station, it is necessary to allocate either an entire data link connection of 2048 kbit/s, typically a cable or radio link connection, or several connections, e.g. n separate connection of 64 kbit/s.
The drawback of fixed connections of 2048 kbit/s is that the transmission capacity offered by such a connection is often too high, i.e. part of the transmission capacity remains unused. For most base stations, about 100 to 500 kbit/s would be sufficient. The systems of the prior art are thus inflexible as regards the allocation of transmission capacity, since it is not possible to select only the required, smaller transmission capacity for use.
The drawback with the use of n separate connections of 64 kbit/s is that the base stations have not been designed for such a data transmission rate. The transmission of a bit stream from the base station to the data link connection is therefore not easy.
SUMMARY OF THE INVENTION
The object of the present invention is to solve the problem described above, i.e. how a transmission channel of 64 kbit/s on an ISDN data link connection is divided between the channels of 8, 16 or 32 kbit/s used by the base station. Thus the invention also solves the problem caused by the fact that previously it has not been possible to connect base stations to ISDN data link connections except by a connection of 2048 kbit/s or n connections of 64 kbit/s.
This new type of mobile communication system and base station of a mobile communication system are achieved with the mobile communication system according to the invention, which is characterized in that the digital transmission system comprises at least one data link connection operating at the rate of the ISDN basic rate access, and digital time division trunk circuits, at least one base station comprises an ISDN basic rate access block for connecting the base station to said data link connection operating at the rate of the ISDN basic rate access, and that the digital transmission system comprises a switching means positioned between the base station and the mobile services switching center for connecting said ISDN basic rate access block of the base station through the data link connection operating at the rate of the ISDN basic rate access to a digital trunk circuit.
The invention further relates to a base station of a mobile communication system comprising a transceiver unit and a multiplexing unit. The base station of the invention is characterized in that it comprises an ISDN basic rate access block for connecting and adapting the base station to a data link connection located between the base station and the mobile services switching center or the base station controller and operating at the rate of the ISDN basic rate access.
The invention is based on the idea that the base station comprises an interface unit, i.e. an ISDN basic rate access block, by means of which the base station is connected to a data link connection operating at the rate of the ISDN basic rate access. This makes it possible to provide a switching means between the base station and the mobile services switching center or the base station controller, said switching means switching the ISDN basic rate access, i.e. a channel of 2.times.64 kbit/s+16 kbit/s or a neces
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patent: 5519702 (1996-05-01), Takahashi
patent: 5579370 (1996-11-01), Fukushima et al.
Patent Abstracts of Japan, vol. 18, No. 113, E-1514, Abstract of JP 5-308673 (A), Nov. 1993.
Leppanen Reijo
Pirinen Mirja
Dolinar Andrew M.
Nokia Telecommunications Oy
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