JPH04127623A - Data repeating system for mobile radio equipment in mobile communication system - Google Patents

Abstract

PURPOSE:To allow this system to tune a new frequency automatically and to implement proper date communication by switching sequentially the frequency of a local oscillating frequency switching means to the frequency of a radio wave of plural repeater stations, receiving the radio wave of a repeater station in an area where a mobile radio equipment itself is present thereon and sending the data at the frequency of the received radio wave. CONSTITUTION:While the frequency of an oscillation means of a mobile radio equipment 1 is switched sequentially to the frequencies fa-fd of a radio wave of plural repeater stations 2a-2d, the radio wave of the repeater stations 2a-2d in areas A-D where the mobile radio equipment 1 itself is present thereon is received. For example, when the mobile radio equipment 1 is resident in the area A, when the frequency of the local oscillation frequency switching means is switched to be the frequency fa, the radio wave from the repeater station 2a is received and the data of the mobile equipment is sent at the frequency fa of the received radio wave. Thus, the frequency of the oscillating means is automatically turned to the frequency of the repeater station in the area where the mobile radio equipment 1 is present thereon.

Description

[Detailed Description of the Invention] Table of Contents Overview Industrial Application Fields Prior Art Problems to be Solved by the Invention Means for Solving the Problems Implementation Examples Effects of the Invention Data for Mobile Radios in Mobile Communication Systems Regarding the relay method, even if a mobile radio device (mobile station) leaves the area of the relay station it is currently communicating with and enters the area of another relay station whose communication signal frequency is different, it will automatically tune to the new frequency. The purpose of this invention is to provide a data relay method for mobile radio equipment in a mobile communication system that can perform proper data communication by outputting radio waves of different frequencies and configuring multiple areas with the radio waves of different frequencies. A mobile station comprising a plurality of relay stations that relay data from mobile radio devices existing in the area, and a control station that controls the plurality of relay stations and collects and processes data from the plurality of relay stations. In a data relay method for a mobile radio in a communication system, the mobile radio has a local oscillation frequency that can arbitrarily switch and fix a frequency under the control of a control means, and that operates a receiver and a transmitter at the fixed frequency. Providing a switching means, while sequentially switching the frequency of the local oscillation frequency switching means to the frequency of radio waves of the plurality of relay stations,
The mobile wireless device is configured to receive radio waves from a relay station in the area where it is present, and to transmit data at the frequency of the received radio waves.

INDUSTRIAL APPLICATION FIELD The present invention relates to a data relay system for mobile radio equipment in a mobile communication system.

In recent years, data (information) communication using mobile radios has come to be widely applied to car phones, portable phones, and the like. Such communications include, for example, agreements to collect information on vacant cars, forwarding, and fares in Takun.

This is done by transmitting information arbitrarily generated from a moving taxi's radio to a control station via a relay station.

However, while this information transmission is taking place, the taxi may leave the area of the current relay station and enter the area of another relay station whose communication signal frequency is different. There is a desire to be able to perform communication by automatically switching frequencies.

2. Description of the Related Art A data relay system for mobile radio equipment in a conventional mobile communication system will be described with reference to FIG.

FIG. 6 is a schematic configuration diagram showing an example of a mobile communication system. As shown in the figure, this system includes a mobile station 1,
It is composed of a plurality of relay stations 2a to 2d, 2al, and a control station 3.

The mobile station 1 is, for example, a car phone, a mobile phone, etc.
can move freely. Further, although only one mobile station 1 is shown in the figure, it is assumed that there are actually many mobile stations. Relay stations 2a to 2d.

2al covers communication in its own predetermined areas ad and al using radio waves of different frequencies fa and fd (however, relay stations 2a and 2al use the same frequency fa). It is assumed that each relay station 2a to 2d, 2al is synchronized wirelessly or by wire. The control station 3 controls each relay station 2a to 2d, 2al, and collects data (information) of the mobile station 1 transmitted via each relay station 2a to 2d, 2al. The data is transmitted via each relay station 2a to 2d and 2al.

In such large-scale mobile communication systems such as car phones and mobile phones in large urban areas, an adjacent relay station constantly monitors the transmission level of mobile station 1, Even if you leave the area of the relay station you are communicating with and enter the area of another relay station, the frequency is automatically switched and you can perform proper data communication.

Problems to be Solved by the Invention Incidentally, in small-scale mobile communication systems such as those in mountainous areas or depopulated areas, it is not possible to have the functions of systems in large cities mentioned above due to cost considerations.
When mobile station 1 leaves the area of the relay station with which it is currently communicating and enters the area of another relay station, the frequency of the communication signal must be manually switched.For example, if the switching is not performed. There was a problem with proper data communication.

The present invention has been made in view of these points,
Even if a mobile radio device (mobile station) leaves the area of the relay station it is currently communicating with and enters the area of another relay station with a different communication signal frequency, it will automatically tune to the new frequency and perform proper transmission. It is an object of the present invention to provide a data relay method for mobile radio equipment in a mobile communication system that can perform data communication.

Means to solve problems FIG. 2 is a principle diagram of the present invention shown in FIG. 1;

In the figure, 2a to 2d are relay stations, which output radio waves of different frequencies fa to fd, and
While configuring multiple areas A to D using radio waves,
Data from mobile radio devices 1 existing in areas A to D is relayed. A control station 3 controls the plurality of relay stations 2a to 2d and collects and processes data from the plurality of relay stations 2a to 2d. Furthermore, the mobile radio device 1 is provided with local oscillation frequency switching means and level detection means, which are the characteristic means of the present invention. The local oscillation frequency switching means emits a frequency that serves as the operating standard for the receiver that receives radio waves and the transmitter that transmits its own data, and can arbitrarily switch and fix the frequency under the control of the control means. can do. The level detection means detects the level of radio waves received by the receiver from the plurality of relay stations 2a to 2d.

Operation According to the method of the present invention described above, the frequency of the oscillation means of the mobile radio device 1 is sequentially switched to the frequencies fa-fd of the radio waves of the plurality of relay stations 2a to 2d, while the presence of the mobile radio device 1 itself is detected. Radio waves from relay stations 2a to 2d in areas A to D are received. For example, if the mobile radio device 1 exists in area A, when the frequency of the local oscillation frequency switching means is switched to fa, the radio waves of the relay station 2a are received, and the mobile radio device 1 transmits its own data at the frequency fa of the received radio waves. is sent.

In addition, as another method, the level detection means of the mobile radio device 1 detects a plurality of relay stations 2a to 2a that are received by the mobile radio device 1.
The level of the 2d radio wave is sequentially detected, and each level is compared by the control means, and the frequency of the local oscillation frequency switching means is fixed to the frequency of the strongest level. Then, its own data is transmitted on this fixed frequency.

Therefore, with either method, it is possible to automatically tune to the frequency of the relay station in the area where the mobile radio device 1 is present.

Embodiment Hereinafter, an embodiment of the present invention will be described with reference to the drawings.

FIG. 2 is a block diagram showing the configuration of a mobile radio in a mobile communication system according to an embodiment of the present invention, and FIG. 3 is a block diagram showing the configuration of a relay station.

The mobile radio device shown in FIG. 2 is applied to the mobile station l of the mobile DMA communication system shown in FIG. 6 described in the conventional example, and the relay station shown in FIG. 2a to 2d and 2al, which have the same configuration as the conventional one.

In FIG. 2, 10 is an antenna, and relay stations 28 to
It receives radio waves (reception data) from relay stations 2d and 2al, and transmits its own radio waves (transmission data) to relay stations 2a to 2d and 2al. Reference numeral 11 denotes a switch for switching between transmission and reception, which connects the antenna 10 to the receiver 12 during reception, and connects the antenna 10 to the transmitter 13 during transmission. Receiver 12
receives the radio waves from the relay station, outputs them to the level detector 14, and outputs control data CD of data carried by the received radio waves to the control section 15. control data CD
is the command data sent from the control station 3 via the relay station. For example, if this mobile station 1 is Takun, it may output information such as empty cars, forwarding, and fare in order, or more important information. It is a collection of commands such as "output".

The level detector 14 detects the electric field strength (level) of the received signal and outputs the detected level L to the control section 15. However, since the mobile station 1 receives radio waves (signals) from a plurality of relay stations 2a to 2d and 2al, the level detector 14 sequentially detects a plurality of signal levels.

The control unit 15 performs various controls, the first of which is to control the frequency switching control signal S1 based on the strongest level L among the plurality of levels L sequentially supplied from the level detector 14. is output to the local oscillator 16, and the local oscillator 16 is fixed at the frequency of the radio wave (with the strongest level). For example, if the radio wave level of the relay station 2a is the strongest among the relay stations 2a to 2d and 2al, the frequency fa is fixed to the local oscillator 16. However, the frequency of the local oscillator 16 can be arbitrarily fixed by controlling the control 815. Receiver 12 and transmitter 13 are arranged to operate at this fixed frequency.

The second is control based on the control data CD from the receiver 12, and based on the above-mentioned commands of the control data CD, r information such as vacant cars, forwarding, and fares extracted by sensors etc. Mobile station transmission data D1 shown in FIG. 4(C)
The mobile station transmission data D is stored in the area of data Dle.
Create 1.

Then, the mobile station transmission data D1 is outputted to the transmitter 13-. By the way, the mobile station transmission data DI is shown in Fig. 4 (C
) to extract the clock as shown in 'OJ
A preamble Dla consisting of a code of "IJ", "Q", "1", etc., and relay stations 2a to 2d.

Synchronization code D for synchronizing 2al and control station 3
lb, the relay station number Dlc of the destination (destination) of this transmission data D1, the mobile station number (for example, the Takun car number) Did, and the data Dle such as empty cars, forwarding, and fares described above. has been done.

Thirdly, the transmission/reception control signal S2 controls the switching between transmission and reception by the switch 11, thereby controlling the reception of the signal by the receiver 12 and the transmission of the mobile station transmission data D1 by the transmitter 13.

The transmitter 13 transmits data D1 at a frequency fixed to the local oscillator 16. This transmission is performed by, for example, local oscillator 1
If the signal frequency fa of the relay station 2a is fixed at 6, the data D1 will be transmitted at that frequency fa. In this case, data DI is received by repeater 2a.

Next, the configuration of the relay station will be explained with reference to FIG.

In FIG. 3, 20 is an antenna that receives data D1 from the mobile station 1 (mobile radio shown in the second diagram) and transmits its own data to the mobile station 1. 21 is a switch for switching between transmission and reception. 22a to 22d are receivers that receive signals of each frequency fa to fd. 23a~
A signal processing section 23b decodes the signals received by each of the receivers 22a to 22b and outputs the decoded signals to the control section 24.

The control unit 24 transmits the decoded signal to the control station 3 via the control station interface unit 25, and also transmits the control command sent from the control station 3 via the interface unit 25 to the 41st W (b ) is stored in the control data CD area of the relay station transmission data D2 and output to the transmitter 26. As shown in FIG. 4(b), the relay station transmission data D2 includes a preamble D2a, a synchronization code D2b,
Own relay station number D2C that is the source of this data D2
, a frequency specifying section D2d for arbitrarily specifying the fixed frequency of the mobile radio, and control data CD.

Further, the control unit 24 supplies a transmission/reception control signal S3 to the switch 21 to control switching between transmission and reception. Transmitter 2
6 is its own frequency (if this repeater is 2a, frequency f
In step a), relay station transmission data D2 is transmitted.

Next, an explanation will be given of the operation of the mobile communication system (see FIG. 1) having the mobile radio device and relay station configured as described above during data communication. However, mobile station 1 in this explanation is a taxi.
shall be.

Now, assume that each relay station 2a to 2d, 2al is transmitting data D2 at each frequency fa-fd at predetermined time intervals, as shown in the dead time of the data collection cycle in FIG. . At this time, Takun's radio (second
When the wireless device (in the figure) is powered on and started up, the wireless device changes the frequency of the local oscillator 16 under the control of the control unit 15 during the dead time of the data collection cycle.
Each relay station 2 switches sequentially from fa to fb to fc to fd.
Data D2 output from a to 2d and 2al is received. This reception is performed by the receiver 12 via the antenna 10 and switch 11 of the radio. Also, upon receiving this,
For example, if a taxi is in area a where only radio waves from relay station 2a reach, the radio will receive only radio waves of frequency fa, so the frequency of local oscillator 16 will be fa.
When the relay station 2a is switched to the relay station 2a, the relay station 2a will tune in and receive the data D2 from the relay station 2a.

The radio that has received this data D2 can know the transmitting relay station 2a from the relay station number D2c of the data D2 (see FIG. 4(b)), and can also know the transmitting relay station 2a specified in the frequency designation section D2d. The frequency of the local oscillator 16 is fixed to fa by control of the control unit 15 based on the frequency fa. Furthermore,
If the control data CD of the data D2 specifies output command information such as vacant cars, forwarding, and fares from the control station 3, the information based on the command is controlled by the control unit 15 as the data Die (first 4(C)), and is transmitted from the transmitter 13 via the switch 11 and the antenna 10. This transmission is performed at a frequency fa fixed to the local oscillator 16.

However, this data D1 is transmitted at the relay station reception time of the data collection cycle shown in FIG.

Note that the dead time of the data collection cycle is the time during which the data D2 is transmitted from each relay station 2a to 2d, 2al to the taxi, and during this period, the data D1 cannot be transmitted from the taxi. On the other hand, the relay station reception time is from the taxi to each relay station 2a to 2d.

This is the time to transmit data D1 to 2al, and data D2 cannot be transmitted from the relay station.

By the way, the timing at which a taxi (mobile radio device) transmits data is based on the time slot random access method, which uses any slot number 1 to n of one data collection cycle, as shown in FIG. 4(a). It will be held at

The car number is set to the mobile station number Did of data D1.

Data D1 transmitted from the taxi in area a is received by relay station 2a. Since this received data D1 is transmitted at the frequency fa, the antenna 20 shown in FIG.
, is received by the receiver 22a via the switch 21, decoded by the signal processing section 23a, and input to the control section 24 manually. The control unit 24 transmits this decoded data to the control station 3 via the interface unit 25. The control station 3 that received this data can determine that the data was sent from the relay station 2a based on the relay station number Dlc, and can also determine that the data was sent from the relay station 2a using the mobile station number Dld. It can be determined from which taxi car the data Dle such as transportation etc. is from.

The operation in the case where the taxi exists in the area of a single relay station has been described above. Next, the operation in the case where the taxi exists in the intersection of two or more areas will be explained.

For example, let us now assume that Kukun is at the intersection of areas ab and d shown in FIG. At this point, Q radio waves will arrive at Itakun from each relay station 2a, 2b, and 2d. Therefore, the taxi transmits the reception frequency of the radio in the data collection cycle to each relay station 2a, 2b, 2.
Switch according to the transmission timing of data D2 of d,
At reception@12, each data D2 is sequentially received. As a result, the chiaria carrying the data D2 is supplied from the receiver 12 to the level detector 14, and its level L is detected and sequentially supplied to the control section 15. And each level JIL
are compared by the first 815, and the frequency with the strongest level L is fixed to the local oscillator 16. Also, during this data collection cycle, if there is any information to be sent, data D1
If the data Dle is not set and transmitted, the level pressure detection described above is repeated.

As explained above, a taxi can automatically receive data D2 in any area by arbitrarily switching the frequency of the station 1fflR transducer 16 or by detecting the level of radio waves of different frequencies. Data D1 can be transmitted.

By the way, conventionally, one area (for example, area a)
If many Takuns concentrate on , the transmitted data DI, D
1. ... will occur, so each data DI
When the receiver 22a of the relay station 2a receives , DI, . However, with the method of the present invention, it is possible to avoid reducing throughput in such cases. This is because, under the instructions of the control station 3, the relay station a specifies the frequency fb of a relay station where taxis are not crowded, for example, the frequency fb of the relay station, in the frequency specification section D2d of the transmission data D2. The data D2 thus obtained is transmitted to the taxi in area a. Upon receiving this data D2, Takun's radio device switches and fixes the frequency of the local oscillator 16 to the frequency fb specified by the frequency designation ID 2d. As a result, the transmission data D1 from this taxi is transmitted to the receiver 2 of the relay station 2a.
2b, and is transmitted to the control station 3 via the signal processing section 23b, the control section 24, and the interface section 25. In other words, data D1 from a taxi in the same area a has a frequency f
a and fb, and this is transmitted to relay station 2a.
Since the receivers 22a and 22b each receive the signal, throughput can be improved.

Also, for example, if a taxi with such a frequency fb setting is present at the intersection of areas a and b,
If the transmission data D1 is sent to relay stations 2 and 2b, each relay station 2a2b transmits the data D1 to each other.
1, but since the number of the destination relay station 2a is specified in the relay station number Dlc of data D1, relay station 2
b discards the data D1. Therefore, data is transmitted to the control station 3 only from the relay station 2a. In other words, even if two relay stations receive the same data DI, the data DI will not be sent redundantly to the control station 3, so that efficient data communication can be performed. Note that when the power of the Takun radio (mobile radio) is cut off, the receiving frequency immediately before the power is cut off is set.

As described in detail, according to the present invention, even in a small-scale mobile communication system, when a mobile station (mobile radio device) moves out of the area of a relay station with which it is currently communicating, When you enter the area of another relay station, you can automatically tune into the new frequency and perform proper communication. In other words, in the past, in small-scale mobile communication systems such as those in mountainous or depopulated areas, automatic frequency switching was not possible and switching was done manually. It can be eliminated.

Furthermore, even if a large number of mobile stations concentrate in the area of one relay station, data communication can be performed without reducing throughput.

Therefore, in view of the above effects, it is recommended to collect irregularly generated data such as empty cars, forwarding, and fares from mobile radio devices that are concentrated in one area or widely dispersed, such as taxis. If applied in such cases, the effect is very large.

[Brief explanation of the drawing]

Fig. 1 is a diagram showing the principle of the present invention; Fig. 2 is a block diagram showing the configuration of a mobile radio in a mobile communication system according to an embodiment of the present invention; Fig. 3 is a block diagram showing the configuration of a relay station in the mobile communication system. , Fig. 4 is a format diagram of transmission data transmitted from mobile radio equipment and relay stations, Fig. 5 is a diagram showing the transmission timing of synchronization signals from each relay station, and Fig. 6 is a schematic configuration diagram of the mobile communication system. be. DESCRIPTION OF SYMBOLS 1... Mobile radio equipment, 2a-2d... Relay station, 3... Control station, 12... Receiving means, 13... Transmitting means, 14... Level detecting means, 15... Control means, 16...Local oscillation frequency switching means, fa to frequency of relay stations 2a to 2d, areas A to D, level of L radio waves.

Claims (1)

[Claims] 1. Output radio waves of different frequencies (fa to fd), configure a plurality of areas (A to D) by the radio waves of different frequencies (fa to fd), and A plurality of relay stations (2a to 2d) that relay data from the mobile radio device (1) existing in D), and the plurality of relay stations (2a to 2d)
), and a control station (3) that collects and processes data from the plurality of relay stations (2a to 2d).
The mobile radio device (1) has a local oscillation frequency that can arbitrarily switch and fix the frequency under the control of the control means (15) and operates the receiver (12) and transmitter (13) at the fixed frequency. A switching means (16) is provided, and the frequency of the local oscillation frequency switching means (16) is set to the frequency (fa to fd) of the radio waves of the plurality of relay stations (2a to 2d).
The mobile radio device (1) receives radio waves from a relay station (2a) in the area (A) in which it exists while sequentially switching to the radio waves, and transmits data at the frequency (fa) of the received radio waves. A data relay method for mobile radio equipment in mobile communication systems. 2. The mobile radio (1) is provided with a level detection means (14) for detecting the level (L) of radio waves received by the receiver (12), and the level detected by the level detection means (14) is The control means (15) compares the radio wave levels (L) of the plurality of relay stations (2a to 2d) and selects the strongest level (L).
) to the frequency (fa) of the local oscillation frequency switching means (
Claim 1, characterized in that the frequency (fa) of 16) is fixed, and data is transmitted at this fixed frequency (fa).
A data relay method for mobile radio equipment in the mobile communication system described above. 3. From the control station (3) to the mobile radio (1), a relay station (2) in the area (A) where the mobile radio (1) exists
a) via the oscillating means (16) of said mobile radio (1);
frequency in an area (B) where the mobile radio device (1) does not exist.
~D) Frequency (fb~fd) of relay station (2b~2d)
The mobile radio (1) receives the instruction data and fixes the frequency (fb~) according to the instruction.
2. The data relay system for a mobile wireless device in a mobile communication system according to claim 1, wherein data is transmitted using a mobile radio communication system.