JPS591016B2 - Mobile phone relay method - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a mobile telephone relay system for mobile subscriber terminals applied to a multi-access wireless telephone system.

Conventionally, in mobile communications, when providing a call service to a mobile object, depending on whether the mobile object is a human being or a mechanical object such as a car, the weight, size, or power of the unequipped object that can be transported is Due to the large capacity constraints,
It has been impossible to standardize the transmission power and reception sensitivity of terminals to the same standard, which is required due to the system.

For this reason, in-vehicle radio systems such as car telephones and mobile phone systems have had to be configured as completely different systems to provide call services. For example, according to a car phone system, subscribers can receive service when they are inside the car, but once they are outside the car, they cannot receive service. It is necessary to receive services from. Providing both systems in this way is not only uneconomical in terms of equipment, but also has a major drawback in that it reduces the efficiency of using the allocated frequencies. The purpose of the present invention is to solve the above problems and
A mobile subscriber terminal in a multi-access wireless telephone system is constructed by dividing it into a main body part that can be installed in a car and an operation part that can be carried by a person, and by connecting the two with a relay transmission path, it can be used in a place far from the car. Another object of the present invention is to provide a mobile telephone relay system in which a plurality of subscribers can talk to a fixed station (or other subscriber) from operating units carried by a plurality of subscribers via a single in-vehicle main unit.

According to the present invention, in a multi-access radio telephone system in which communication is performed between a fixed station or a partner subscriber and a plurality of mobile subscriber terminals by sharing a plurality of radio channels, the mobile subscriber terminal comprises a main body consisting of a radio for the wireless channel, a controller, and a relay transceiver controlled by the controller, a relay transceiver on the subscriber side, and a controller that controls the relay transceiver. and a plurality of operating sections consisting of a handset and a receiver, a relay transmission path is formed between the main body and the plurality of operating sections using weak radio waves of a frequency different from the frequency of the wireless channel, and the The plurality of operating units can receive calls from the main unit via the relay transmission path, and when receiving a subscriber designation control signal from the main unit, only the designated operating unit detects the control signal. , a mobile subscriber characterized in that by driving a transmitter and sending a response toward the main body, the main body is used as a relay to communicate with the fixed station or the other subscriber. A mobile phone relay system at the terminal is obtained.

Here, in order to facilitate comparison with the present invention, a conventional mobile subscriber terminal applied to a multi-access wireless telephone system will be explained with reference to the block diagram of FIG.

In the figure, 1 is an antenna for transmitting and receiving, 2 is a radio, and 3
indicates a handset. Radio 2 is a shared device for 2-1, 2
-2 FM receiver, 2-3 synthesizer, 2-4 FM transmitter, and 2-5 controller. Radio waves from the fixed station are transmitted to FM via duplexer 2-1. The audio wave output received by the receiver 2-2 and subjected to frequency discrimination is sent to the transceiver 3 via the controller 2-5. The FM transmitter 2-4, driven by the controller 2-5 in response to the individual paging signal, frequency-modulates the voice from the handset 3 and transmits it from the antenna 1 via the duplexer 2-1. Synthesizer 2-3
is a frequency-switchable local oscillator for the FM receiver 2-3 and the FM transmitter 2-4, which selects the necessary wireless channel under the control of the controller 2-5 and transmits the frequency to the FM receiver 2-2 and the FM transmitter. 2-4 is activated. Mobile subscriber terminals configured in this manner are usually designed to be installed in automobiles and are suitable for relatively long-distance communication with fixed stations, so the weight and volume of the devices are large. Therefore, it cannot be carried and used by subscribers who are far away from their cars. Next, an embodiment of the present invention applied to a multi-access radio telephone system will be described with reference to the block diagram of FIG.

In this mobile subscriber terminal, 1 is a common antenna;
indicates a handset, 10 indicates a main body, 11 indicates a relay antenna,
These are used for in-vehicle use inside automobiles and the like. In addition to the shared antenna 1 and the handset 3, a shared device 10-1, an FM receiver 10-2, and an FM receiver 10-2, which are housed in the main body 10,
The synthesizer 10-3 and the FM transmitter 10-4 are
The functions are the same as those of the shared antenna 1, handset 3, duplexer 2-1, FM receiver 2-2, synthesizer 2-3, and FM transmitter 2-4 in the conventional example shown in FIG. Further, the controller 10-5 is the controller 2- in FIG.
In addition to the same control circuit as 5, it also has a circuit that controls the relay FM transceiver 10-6, a control signal generation circuit for subscriber designation, and a connection and relay between the relay FM transceiver 10-6 and the transceiver 3. The FM transceiver 10-6 includes a circuit for switching and controlling connections between the FM transceiver 10-6, the FM receiver 10-2, and the FM transmitter 10-4. Further, reference numeral 20 indicates an operation unit, 21 indicates a relay antenna, and 22 indicates a handset, which the subscriber carries as a unit when doing work etc. away from the car. Use as.

Therefore, if there are multiple subscribers, multiple sets can be prepared so that each subscriber can carry them. Operation unit 2
0 is composed of a relay FM transceiver 20-1 and a controller 20-2, of which the controller 20-2 connects the relay FM transmitter/receiver 20-1 and the transmitter/receiver 22. The transmission section of the relay FM transceiver 20-1 can be driven and controlled by the built-in control signal identification circuit for subscriber designation. To explain the operation of the mobile subscriber terminal configured as described above, when the subscriber is in the car, the handset 3 can be used to make calls to and from fixed stations.

Next, if the subscriber is away from the car, the agent in the car receives a call from the fixed station or after communication, the relay FM transceiver 10 is activated by the controller 10-5.
-6, and transmits FM radio waves by voice from the antenna 11 to the relay transmission path. Operation unit 2 carried by the subscriber
0 receives the radio wave through the relay antenna 21,
It can be heard on the handset 22. Even if a plurality of subscribers are in different locations, each carrying an identified operation unit, they can receive communications from the main body 10 all at once. Next, by operating the controller 10-5 of the main body 10, the built-in control signal generation circuit outputs a control signal (also referred to as a sub-audio tone) specifying a desired operation section from among the plurality of operation sections. When transmitted from the transmitter of the relay FM transmitter/receiver 10-6, the corresponding operation unit that receives this control signal identifies the signal by the control signal identification circuit of the controller 20-2, and performs the relay FM transmitter/receiver. The transmitter of the machine 20-1 is driven. Then, a response signal is sent to the main body 10. Upon receiving this, the main body 10 interrupts the above-mentioned control signal, thus creating a state of simultaneous transmission and reception with the corresponding operating section. Of course, in this case, the other operating units are placed in a state where they cannot transmit. In the above condition,
The agent in the vehicle communicates with the designated subscriber via the relay transmission path between the main body 10 and the designated operation section, and makes necessary communications.

In the next step, the intermediary controls the controller 10-5 to connect the input and output sides of the relay FM transceiver 10-6 to the output side of the FM receiver 10-2 and the input side of the FM transmitter 10-4, respectively. By connecting to the main body 10, it becomes possible to communicate between the subscriber of the specified operation unit and the fixed station or the other subscriber via the main body 10. In addition, the relay FM transceiver 10-
The carrier frequencies for FM in 6 and 20-1 are different from the frequency bands for the wireless channels used by the FM receiver 10-2 and the FM transmitter 104, respectively, and the transmission power is also different from the frequency band for the wireless channel used by the FM receiver 10-2 and the FM transmitter 104, and the transmission power is also different from the frequency band for the radio channel used by the FM receiver 10-2 and the FM transmitter 104. It is designed to be extremely small to fit within its range of activities. According to the above embodiment, for example, by parking the car equipped with the main body at the entrance of a tunnel or next to the window of a building,
It is now possible to easily communicate with subscribers even in tunnels and buildings where wireless radio waves from the car telephone system cannot reach. As is clear from the above description, according to the present invention, a relay transmitter/receiver is connected via a controller to an in-vehicle mobile subscriber terminal applied to a car telephone system, etc. By arranging multiple subscriber relay transceivers facing each other through a transmission path, a single mobile subscriber terminal installed inside the vehicle can be used even when multiple subscribers are away from the vehicle. Not only can it be used to easily communicate with a fixed station or other subscriber by sharing the same, but it can also be used as a solution to dead spots in car telephones, etc., and since the transmitted radio waves for relaying only need to be weak, the subscriber's mobile phone can The operating section can be designed to be extremely compact, which has great effects in terms of handling and economy.

[Brief explanation of the drawing]

FIG. 1 is a block diagram showing the configuration of a conventional example of a mobile subscriber terminal, and FIG. 2 is a printer diagram showing the configuration of an embodiment according to the present invention.

Claims (1)

[Claims] 1. In a multi-access radio telephone system in which communication is carried out between a fixed station or a partner subscriber and a plurality of mobile subscriber terminals by sharing a plurality of radio channels, the mobile subscriber terminal A main body consisting of a radio device, a controller, and a relay transmitter/receiver controlled by the controller, a relay transmitter/receiver on the subscriber side, a controller that controls the relay transmitter/receiver, and a transmitter/receiver. a plurality of operation sections, a relay transmission path is formed between the main body and the plurality of operation sections using weak radio waves of a frequency different from the frequency of the wireless channel, and the plurality of operation sections When receiving a call from the main unit via the relay transmission path and receiving a control signal for specifying a subscriber from the main unit, only the designated operation unit detects the control signal and drives the transmitter. and by responding towards said body,
A mobile telephone relay system in a mobile subscriber terminal, characterized in that a call is made between the fixed station or the other subscriber by relaying the main body.