Subscriber network element

Details Subscriber network element Subscriber network element

1997-08-12

1999-08-03

Eisenzopf, Reinhard J.

Telecommunications

Transmitter and receiver at same station

Radiotelephone equipment detail

455561, H04B 100

Patent

active

059337869

DESCRIPTION:

BRIEF SUMMARY
FIELD OF THE INVENTION

The invention relates to a subscriber network element of a radio system that provides a wireless local loop. The subscriber network communicates with an exchange and comprises a means to establish, via base stations, a radio connection with subscriber stations located in the coverage area of the radio system, to transmit telecommunication signals between the subscriber stations and the exchange.


BACKGROUND OF THE INVENTION

The invention relates to a Wireless Local Loop System (WLL), i.e., a radio system providing a wireless local loop, in which subscriber stations are connected over a radio connection via base stations and a subscriber network element to an exchange of a public switched telephone network. Any conventional user interface, i.e., telephone set, can be connected to a WLL system via a special terminal equipment, whereby the radio path is invisible to the user.
The subscribers of a WLL system must have access to a register recall facility and subscriber facilities requiring it, in the same way as the subscribers of a normal wired network. To render the radio path invisible to the user of a WLL subscriber station, it must be possible to use the station in exactly the same way as a conventional wired telephone. This means that a register recall must be implemented such that the subscriber first presses the R-key, waits until a dial tone is transmitted to him, and then dials the desired digits via the user interface.
WLL systems are usually based on a known cellular radio system, such as the NMT-450i system (Nordic Mobile Telephone), whereby their signal is usually similar to that of the cellular radio system concerned. It is thus advantageous that subscriber stations of the cellular radio system on which the WLL system is based can also be used in the WLL system. For example, according to the specifications of the NMT-450i system, a register recall is performed by first dial the desired digits to the memory of the telephone and then pressing the R-key to effect a register recall. When an NMT phone is used, the register recall procedures are performed in the reverse order as compared with a fixed, wired network, which is problematic to the subscriber network element of the system.


SUMMARY OF THE INVENTION

The object of the present invention is to solve the above problem and to provide a subscriber network element that is able to process a register recall regardless of the type of subscriber station that sends the register recall. This object is achieved with a subscriber network element of the present invention, which includes a timer which measures a time interval of a predetermined length, a buffer that buffers received dial frames until the time interval measured by the timer means elapses, and a control unit arranged to transmit a stand-by message to a subscriber station and a register recall message to an exchange, to initialize the timer to measure the first time interval of the predetermined length in response to receipt of a register recall frame, and to transmit a `dial received` frame to the subscriber station and any digits buffered to the buffer to the exchange in response to the end of the time interval measured by the timer. The timer starts measuring a new time interval to a predetermine length upon receipt of each dialing frame.
The register recall and the associated facilities can be implemented in a simple and quick manner regardless of the type of subscriber station, when the recall frame and associated dialings are transmitted by the subscriber network element to the exchange of a fixed telephone network, whereby the dial by the subscriber can be analyzed in the exchange. The subscriber network element does not need to be able to analyze the dialing. The characteristics already existing in the exchange of the fixed network are not needed in the subscriber network element.
When time supervision is arranged in the subscriber network element after receipt of a register recall frame, when dialing frames received during time supervision are buffered and

REFERENCES:
patent: 3705269 (1972-12-01), Audesirk et al.
patent: 4658096 (1987-04-01), West, Jr.
patent: 5535260 (1996-07-01), Zicker et al.
patent: 5666398 (1997-09-01), Schiffel et al.
patent: 5724656 (1998-03-01), Vo et al.
patent: 5799254 (1998-08-01), Karmi et al.
patent: 5812651 (1998-09-01), Kaplan

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