FI108382B - Device and method of data transfer - Google Patents

Description

108382

Hardware and method for transferring data

The invention relates to an apparatus and method for establishing a radio link between two radio interfaces and for transmitting information between these interfaces.

Transferring information along a radio bearer, e.g., through an obstacle such as a wall, can sometimes prove difficult due to the limited power of the mobile station and base station. Figure 1 illustrates this problem. An attempt is made to establish a connection between the mobile station 5 and the base station 1 even though the message is located behind an obstacle 9 through which communication is not possible. Currently, information is transmitted indoors or out as shown in Figure 2. From the base station 1, the BS transmits information on the radio frequency to the antenna 2 which communicates with the repeater 3 via a radio frequency cable 4. Repeater 3 is a device that automatically re-transmits signals from one connection to another. Generally, in such a case, repeater 3 is indoors. The information is amplified by the radio frequency amplifier 6 in the repeater and transmitted to the indoor handset 5. The amplifier 6 is broadband. The incoming electrical power is spread over several channels, and the call quality of the amplifier may vary. The cables 4 and 4A coming from the antennas 2 and 2A of the amplifier must be radio frequency cables, so the transmission of information in this way is considerably expensive. The call or other information is transferred in the opposite direction, respectively.

• · «• · · · • t • · c *. To solve and implement this problem, the method and apparatus according to the invention are characterized by what is stated in the characterizing parts of the claims.

An important advantage of the invention is that the costs of information transmission are reduced. Known standard circuit boards used in radiotelephones may be used as devices. Thus, transceiver / receiver circuits of the mobile station, which are standard serial production components, can be utilized. You do not need to move the radio frequency along the radio frequency cable. . : through the obstacle. The connection between the top and bottom of the repeater can be implemented in a more advantageous manner than before.

In the following, the invention will be described with reference to the accompanying drawing, in which Figure 1 shows a principal view of the problem area, Figure 2 shows a prior art data transfer, Figure 3 shows a solution according to the invention in one embodiment.

Figure 4 Transmitter and receiver solutions for a message transmitted from a base station.

Figure 3 illustrates an improvement in transmitting a radiotelephone message when it is desired to transmit a radio frequency message to a location that cannot be reached by normal base station operation. The following describes the transmission of a message in one direction. It is obvious, of course, that it is possible to move the message in the opposite direction and to do so in the opposite direction.

The radio frequency message is transmitted from the base station 1 (BS) to the antenna 2 of the repeater top 3a receiving the radio frequency message and capable of converting or demodulating the message from the radio frequency to the audio frequency 8 along the receiving handset 5.

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In more detail, the transmitter and receiver circuits of the NMT telephone form a repeater consisting of a master and a slave. To protect these circuits, a housing: T: or equivalent is placed. The central unit controls the traffic from the inside to the outside and vice versa and is able to recognize the signaling hand: ·. The switches control the call to the recipient and control the · · repeater, and can convert radio frequency to audio frequency and vice versa.

The transmitter and receiver frequencies at the bottom of the repeater correspond to the base station frequencies. Although the transmitter and receiver repeater of the NMT telephone may result in reduced power in transmissions, in most cases even a small amount of power will suffice because of the limited interior space.

Because the call is transferred between the ends of a two-part repeater at the audio frequency, the wires used are cheap. Therefore, using a splitter, the upper end of the repeater, i.e. the master part, can leave several wires, the ends of which are placed in different rooms or spaces so that the message can be moved to the desired locations. The solution according to the invention, in its simplest form, transmits only one call at a time in frequency division mobile communication. Depending on the number of calls, a system of any size can be selected. A particularly preferred invention is low-density call forwarding.

Copper cable, fiber optic cable, radio link or, for example, a duplex connection may be used as the transmission path 7 between the top and bottom of the repeater. The repeater must be able to receive messages and forward them to bearers. The method may transmit time, code, or frequency division mobile communications.

The upper and lower parts of the repeater can be made modular, so that also in frequency-sharing traffic, calls can be transmitted on multiple channels.

«·; Figure 4 then shows in more detail the transmission of the message from the base station to the mobile station. Of course, it should be noted that the message can be moved in the opposite direction when opposite circuits are in use. From base station 1 near. ' transmitting the message, receiving the message at the top of the repeater; in section 3a, via a receiver circuit, the message is converted to audio frequency and the message is routed along a connection 7 between the bottom and top repeater 3b, 3a to the transmitter bottom 3b, while baseband speech modulates the radio frequency of the radio transmitter 3b.

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In particular, it should be noted that the invention has been described above with reference to only one preferred embodiment thereof. However, this is in no way intended to limit the invention to only 4,108,382 for this example, but many modifications are possible within the scope of the inventive idea defined in the following claims.

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Claims (6)

5, 108382 A method in which information is transmitted between a base station (1) and a radiotelephone (5) via a repeater (3) over a communication path, characterized in that the radio frequency message to be transmitted between the base station (1) and the mobile station (5) is demodulated into a voice frequency message in a repeater (3a, 3b) capable of performing voice / radio frequency conversions and thus transmitting the changed information to a desired subscriber in the communication path, consisting of two parts (3a, 3b) containing the aforementioned functions, between which there is a voice frequency connection (7). Method according to claim 1, characterized in that the information transmitted over the radio interface is received in a repeater (3a, 3b) which is a radio transmitter / receiver unit, the information is demodulated therefrom off a radio frequency, the demodulated information is transmitted as a carrier frequency to another receiver / transmitter unit (3b). along the transmission path (7), as the carrier frequency speech modulates the radio frequency of the radio transmitter (3b, 3a), the radio waves are transmitted to the mobile station (5). The method according to claim 1, characterized in that frequency-division information is transmitted through the repeater (3a, 3b). A method according to claim 1, characterized in that time-division information is transmitted through the repeater (3a, 3b). A method according to claim 1, characterized in that the code-shared information is transmitted through the repeater (3a, 3b). The method according to claim 1, characterized in that the transmitter and receiver frequencies of the repeater inner part (3b) correspond to the frequencies of the base station (1). 108382 Apparatus for transmitting information between a base station (1) and a mobile station (5) via a repeater (3), characterized in that a repeater (which converts a radio frequency message into an audio frequency message and a radio frequency message into a radio frequency message) is between the base station (1) and the mobile station (5). 3a, 3b) capable of performing audio frequency / radio frequency conversions and thus transmitting the changed information to a desired subscriber in the communication path, consisting of two parts (3a, 3b) containing the aforementioned functions, between which there is a voice connection (7). Apparatus according to claim 7, characterized in that the audio frequency connection (7) is a radio link, a copper cable, a fiber optic cable or a twin cable. «I · # · · ·« i - * · • * • t •. ».1 I '• 9 m 108382