FI97670C - Method for initiating a register recall in a radio system, subscriber equipment and subscriber network element - Google Patents

Description

97670

The present invention relates to a method for providing a recall of a register 5 from a subscriber device of a radio system implementing a wireless local loop, the radio system comprising a subscriber network element and base stations for transmitting telecommunication signals between public telephone networks and subscriber devices. The invention further relates to a subscriber device for a radio system implementing a wireless local loop, which consists of a terminal and a user interface. The invention further relates to a subscriber network element of a wireless local loop radio system in communication with a telephone exchange, comprising means for establishing a radio connection to subscriber devices in the coverage area of the radio system via base stations, for transmitting communication signals between the subscriber devices and the telephone exchange.

This invention relates to a Wireless System (WLL)

Local Loop), i.e. to a radio system implementing a wireless local loop, in which subscriber devices are connected by radio to base stations and via a subscriber network element to a public switched telephone network (PSTN).

25 The WLL system can be transmitted via a special terminal • · 1, j; ' to connect any traditional type of operating device

• M

••• j subscription, ie a telephone set, in which case the radio path is invisible to the user V ·.

In this context, a subscriber device means the equipment available to the subscriber for transmitting and receiving telecommunication signals, i.e. in the case of a WLL subscriber device, the subscriber device comprises a terminal consisting of a radio part and a tele-adapter and an interface to be connected to the terminal. telephone, facsimile machine, computer / modem connection or the like.

Subscribers to the WLL system must have access to the recall of the register and the space and functions that require it, just as they are available to subscribers of the ordinary wired network. Also in the case of a loop-dial telephone, the restrictions on use must also be the same as for landline subscribers, i.e. only tracing of the functions requiring recall works.

It is an object of the present invention to provide a register recall and the subscriber functions required for it to the subscribers of the WLL system. These objects are achieved by the method according to the invention, characterized in that in the speech mode of the subscriber device a re-15 call recall frame is sent to the subscriber network element, a message is received from the subscriber network element about receiving the frame, and the selections entered from the subscriber device interface are transmitted to the

The invention is based on the idea that the recall of the register and the related functions can be carried out simply and quickly when the recall frame and subsequent selections are sent from the subscriber device via the subscriber network element to the fixed telephone exchange, whereby the subscriber's selection in the recall frame can be analyzed. and the subscriber network element * · · * V 1 does not need to be able to analyze the selection. The method according to the invention thus utilizes pre-existing features in the exchange of the fixed telephone network. The most significant advantage of the method according to the invention is that the recall of the register and the functions requiring it can be provided to the subscribers in a simple and reliable manner without imposing new requirements on the characteristics of the subscriber network element or significantly increasing its price.

The invention further relates to a subscriber device with which the method according to the invention can be applied. The subscriber device according to the invention is characterized in that the terminal device 5 comprises means for transmitting a register recall frame to the subscriber network element in response to a recall signal transmitted from the user interface, and means for transmitting selections transmitted from the user interface to the subscriber network element after receiving the standby message.

The invention further relates to a subscriber network element with which the method according to the invention can be applied and which is suitable for use in connection with a subscriber device according to the invention. The subscriber-15 network element according to the invention is characterized in that the subscriber network element comprises means responsive to the recall frame sent by the subscriber device - to send a standby message to the subscriber device, on the voice path to the fixed telephone exchange.

25 WLL systems are usually based on a known • · * ··· * cellular radio system, in which case WLL systems • · · ••• | This equipment has been obtained by simplifying the components of a cellular radio system, removing features that are not required in a WLL system.

However, it is preferred that the telephones of the original cellular radio system could also be used as subscriber devices in the WLL system. Thus, the subscriber network element according to the invention preferably also comprises means for processing selections to be transmitted as number frames, since, for example, the specifications of the NMT-450i system specify that selections after a register recall frame are transmitted specifically as number frames.

Preferred embodiments of the method and the subscriber device and the subscriber network element according to the invention appear from the appended dependent claims 2, 4 to 5 and 7.

The invention will now be described by way of a first preferred embodiment thereof with reference to the accompanying Figures 10, of which Figure 1 shows a block diagram of a WLL system, and Figure 2 shows a partial block diagram of the subscriber network element shown in Figure 1.

Figure 1 shows a block diagram of a part of a WLL system in which the method according to the invention can be applied. The WLL system shown in Figure 1 is based on the ΝΜΤ-450Ϊ system, which has been simplified by removing unnecessary features. Base stations 5 correspond to the components of a ΝΜΤ-450Ϊ (Nor-20 disk Mobil Telefon) cellular radio system. The order device 1 thus functions in terms of signaling almost in the same way as a normal subscriber device of the NMT-450i system. Calls to the mat telephone 1 of the conventional ΝΜΤ-450Ϊ system can also be forwarded via the base stations and the subscriber network element 6, provided that the network operator; The market has programmed the subscriber network element 6 with a view to • forwarding calls to that telephone. In this case, however, said NMT telephone 9 can be used only in the radio coverage area of one base station 5, because the subscriber network element shown in Fig. 30 does not comprise handover means by means of which the ongoing call could be transferred to the base stations. Between 5.

The subscriber device 1 shown in Fig. 1 consists of a telephone 2 and a terminal 3. The pu-35 Helin 2 shown in Fig. 1 is a conventional fixed telephone network.

I lii i HUI I I i Id I

5 97670 available voice dialing phone. In Fig. 1, the telephone 2 and the terminal 3 are connected by a pair line 4, by means of which signals can be transmitted between the terminal and the telephone. The terminal 3 comprises signal-5 link processing means for adapting the voice path to the radio channel. Such signal processing means include a radio part comprising an antenna 8, a radio transmitter and a radio receiver, and a telecommunication adapter which fits the radio part to a conventional telephone 2.

The subscriber device 1 communicates via the radio 8 with radio signals via the antenna 8 to the base station 5 (three base stations BS are shown in the figure), through which calls are forwarded to the subscriber network element 6 and further to the PSTN (Public Switched Telephone Network), i.e. to the fixed telephone exchange 15. The subscriber network element 6 is connected to the local exchange of the fixed telephone network with CCITT Q.512 V2 type open multiplexer interface using 2 Mbit / s PCM system.

When the user of the telephone 2 in the speech mode presses the R-button 20 (or dials the number 1 in the case of a loop-dial telephone), the terminal 3 sends a register recall frame, and enters the so-called R-mode to wait for an acknowledgment with time control. In R mode, the terminal does not transmit the received communication signals to the pu-25 2. Subscribe and the network element 6 resets • · ** | • · · the standby message sent by the invitation frame to the subscriber unit 1 by radio. Immediately after sending the standby message, the subscriber network element sends a "selection sufficient" message to the subscriber device, whereby the terminal 3 returns to the talk mode. If the subscriber network '· / ·: test element does not receive a standby message within a predetermined period of time, the terminal 3 returns to the talk mode.

Fig. 2 shows a partial block diagram of the subscriber network element 6 shown in Fig. 1. Only those components of the ti-35 wide area network element required to transmit a recall of the register from the subscriber devices 1 or 9 of Fig. 1 are shown in Fig. 2. NMT specification sent to the subscriber device 1 or 9 is transmitted from the base station 5 to the subscriber-5 network element control unit 10. The control unit immediately acknowledges receipt of the frame by sending a message via the base station 5 to the subscriber device. The type of subscriber device that sent the frame is then identified by the identification block 11.

In the case of a subscriber device 1 consisting of a conventional telephone set and a WLL terminal, the control block 10 immediately sends a register recall to the telephone exchange of the PSTN network. The telephone exchange does not acknowledge the recall in any way, but it switches a dial tone which is transmitted directly to the subscriber device 1 by the subscriber network element 15. The user of the subscriber device hears a dial tone, after which he dials the number on his telephone. This selection is transmitted as an audio frequency directly on the voice path via the space network element 6 to the PSTN exchange.

If, on the other hand, the identification block 11 detects that it is a mobile phone of the NMT-450i cellular radio system, the control block 10 starts receiving individual number frames according to the NMT specifications transmitted from the mobile phone 9 and transmitted via the base station 5 and entering the number information in the buffer. 12. Timer 13 measures the time that has elapsed since the previous number was entered into the buffer. When said time measured by the timer 13 exceeds a predetermined time, the control block 10 assumes that the selection transmitted by the NMT telephone has been received in its entirety, whereby the control block 10 sends to the mobile telephone 9 the selection specified in the NMT specifications. receiving the message, and to the exchange of the PSTN network a re-call of the register and the selection stored in the buffer 12, preferably as a tone-35 frequency selection.

7 97670

The subscriber network element according to the invention is thus also able to handle a recall of the register sent by the NMT-450i system mobile phone, although it does not comprise means for analyzing the number-5 dialing sent from the mobile phone (enabling the NMT-450i MTX exchange to determine when the dialing is fully received) .

It is to be understood that the foregoing description and the accompanying drawings are intended only to illustrate one preferred embodiment of the invention without limiting the invention itself. Thus, the solution according to the invention can also be utilized in WLL systems based on a cellular radio system other than the NMT-450i system described in Example 15 above. Preferred embodiments of the method, the subscriber device and the subscriber network element according to the invention may thus vary within the scope of the appended claims.

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Claims (7)

A method for obtaining a register call from a subscriber apparatus (1) in a radio system constituting a cordless local loop, said radio system comprising a subscriber network element (6) and base stations (5) for transmitting data communication signals between the subscriber apparatus ( 1) and the public telephone network, characterized in that a register repeater frame is transmitted during the speech state of the subscriber apparatus (1) to the subscriber network element (6), a message that the frame is received is awaited from the subscriber network element (6), and received from the subscriber network (1) user connection (2) is transmitted along a voice transmission path via the subscriber network element to the public telephone network. 2. A method according to claim 1, characterized in that the choices entered from the user connection (2) are sound frequency choices. Subscriber apparatus (1), consisting of a terminal (3) and a user connection (2), in a radio system constituting a cordless local loop, characterized in that the terminal (3) comprises means for transmitting a register call frame to the subscriber network element ( 6) in response to a forwarded call signal transmitted by a user user (2), and means for transmitting from the user connection • * *** (2) transmitted via a voice transmission path to the subscriber ♦ ·· *; · | The network element (6) after a readiness message ♦ ♦ ·. * * is received. Subscriber device according to claim 2 or 3, characterized in that the user connection (2): consists of a telephone with sound frequency selection, wherein said caller signal is generated when the R-button is pressed under the speech device of the subscriber device. Subscriber device according to claim 2 or 3, characterized in that the user connection (2) is a telephone with loop selection, wherein said caller signal is generated by selecting number 1 under the subscriber device's speech state. A subscriber network element (6) in a radio system performing a cordless local loop, which subscriber network element 5 interferes in data transmission connection with a telephone exchange (7) and comprises means for establishing a radio connection with subscriber apparatus (1, 9) within the coverage area of the radio system, for transmitting data communication signals between the subscriber apparatus (1, 9) and the telephone exchange (7), characterized in that the subscriber network element (6) comprises means (10) responsive to one of the subscriber apparatus (1, 9) transmitted caller frame - to send an emergency message to the subscriber device (1, 9), - to identify the type of the subscriber device (1, 9) that sent the caller frame, - to send a register caller message to the fixed telephone network center (7 ), and 20. to transmit on the voice transmission path received from the subscriber apparatus (1) to the center of the fixed telephone network (7). Subscriber network element according to claim 6, characterized in that the subscriber network element (6) further comprises ... - on memory means (11) corresponding memory memory (12) for buffering as number frames from subscriber * · *! the apparatus (9) received vai, corresponding to the clock means (12) corresponding clock means (13) to measure the time elapsed since the preceding frame «received, and - to the clock means (13) responsive means (10) ) to convey the buffered choices to the fixed telephone network's center (7), and to transmit a predetermined message to the subscriber apparatus (9) where the time elapsed since the previous frame was received exceeded a given set time.