JPH06292258A - Mobile communications system - Google Patents

Abstract

PURPOSE:To inexpensively improve the reliability of communication data by selecting a base station through the measurement of a B. E. R. CONSTITUTION:A mobile radio station 5 is provided with a bit error rate measurement use data generating section 8a to generate bit error rate measurement data for the measurement of a bit error rate of a reception signal, and a base station 6a (6b) is provided with a bit error measurement section 9b (9c) to measure a bit error rate of the reception signal. Then a controller 7 selects a base station whose bit error rate is small.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a mobile communication system, and more particularly to a base station and a frequency in which a line condition between a mobile radio device and a base station is the best, the control device assigning the mobile radio station to the mobile radio station for use in communication. It's about what you can do.

[0002]

2. Description of the Related Art FIG. 4 is a block diagram showing a conventional mobile communication system. In FIG. 4, reference numerals 1a, 1b and 1c denote data generating sections for generating data such as digitizing voice signals and generating control signals, and 2a, 2b and 2c denote data generated by the data generating sections 1a, 1b and 1c. For wirelessly transmitting data, variable transmission frequency, 3a, 3b, 3c for receiving data wirelessly, variable reception frequency, 4a, 4b, 4c
Is a data analysis unit for analyzing the data received by the reception units 3a, 3b, 3c and returning it to the original audio signal, and 5 is a data generation unit 1a, a transmission unit 2a, a reception unit 3a and a data analysis unit. Mobile radio station having part 4a, 6a
Is a base station having a data generator 1b, a transmitter 2b, a receiver 3b and a data analyzer 4b, and 6b is a data generator 1
A base station 7 having c, a transmitter 2c, a receiver 3c and a data analyzer 4c is a control device capable of controlling the mobile radio station 5, the base station 6a and the base station 6b. Also, 12
Reference numerals a and 12b are reception electric field measuring devices for measuring the electric field from the mobile radio station 5 by switching the frequency. Here, the transmission / reception channels of the base stations 6a and 6b are CH1 and CH2.

Next, the operation will be described. Mobile radio station 5
CH the transmission / reception channel when communicating with the base station 6a.
1, the data generated by the data generation unit 1a is transmitted from the transmission unit 2a, and the data received by the reception unit 3a is analyzed by the data analysis unit 4a. Also, the base station 6a uses the transmission / reception channel CH1 when communicating with the mobile radio station 5.
, The data generated by the data generation unit 1b is transmitted from the transmission unit 2b, and the data received by the reception unit 3b is analyzed by the data analysis unit 4b. The control unit 7 controls the electric field from the mobile radio station 5 with the received electric field measuring devices 12a and 12b.
When the electric field received by the reception electric field measuring device 12a is below a certain level and the electric field received by the reception electric field measuring device 12b is above a certain level, the mobile station moves through the base station 6a. A channel switching instruction is sent to the wireless station 5 to switch the transmission / reception channel to CH2. The mobile radio station 5 receives this channel switching instruction and sets it to the transmission / reception channel CH2 of the base station 6b,
The communication with the base station 6b is continued.

As described above, by monitoring the reception electric field of the radio wave from the mobile radio station at a plurality of base stations during a call, detecting the base station having a strong reception electric field, and switching to the communication with the base station. A technique for maintaining the line quality is generally called handover.

[0005]

The conventional mobile communication system is configured as described above, and the base station is selected by measuring the electric field from the mobile radio station with the reception electric field measuring device. I have to. For this reason, there has been a problem that a line with the received electric field measuring device and the control device has to be installed, and the installation place and cost thereof are required.

The present invention has been made in order to solve the above-mentioned problems of the conventional ones, and by making it possible to perform a handover without a reception electric field measuring device, it is possible to easily and highly reliably. An object of the present invention is to obtain a mobile communication system capable of performing communication.

[0007]

A mobile communication system according to the present invention generates a bit error rate measurement data for measuring a bit error rate of a received signal in a mobile radio station. A bit error rate measuring unit for measuring the bit error rate of a received signal is provided in the base station, and the control device thereof selects a base station having a small bit error rate.

Further, in the mobile communication system according to the present invention, the base station is provided with a bit error rate measurement data generating section for generating bit error rate measurement data for measuring the bit error rate of the received signal, and
A mobile radio station is provided with a bit error rate measuring unit for measuring a bit error rate of a received signal, and a control device thereof selects a base station having a small bit error rate.

Further, in the mobile communication system according to the present invention, the data received by the coding unit and the receiving unit that perform error correction coding on the data generated by the data generating unit are transmitted to both the base station and the mobile radio station. A decoding unit for performing error correction decoding is provided, and the control device is configured to select a base station with a small error bit number in correction decoding at either the base station or the mobile radio station. Is.

[0010]

In the present invention, the bit error rate measurement data transmitted from the mobile radio station is received by the base station side, and the base station having the smaller bit error rate of the bit error rate measurement data is selected. Therefore, the base station corresponding to the handover can be selected without using the received electric field measurement device, and the reliability of communication is improved.

Further, according to the present invention, the mobile station receives the bit error rate measurement data transmitted from the base station, and selects the base station having the smaller bit error rate of the bit error rate measurement data. Therefore, the selection of the base station corresponding to the handover can be executed without using the reception electric field measuring device, and the reliability of communication is improved.

Further, according to the present invention, when both the base station and the mobile radio station perform error correction coding on the data generated by the data generation unit and error correction decoding is performed on the data received by the reception unit, Since either the base station or the mobile radio station detects the error bit number and selects the base station having the smaller error bit number, the base station corresponding to the handover without using the received electric field measuring device. Can be selected and the data can be corrected and decoded, so that the reliability of communication is further improved.

[0013]

EXAMPLES Example 1. An embodiment of the present invention will be described below with reference to the drawings. In FIG. 1, reference numerals 1a, 1b and 1c denote data generators 2a, 2b, which generate data for transmission such as digitizing voice signals and generating control signals.
Reference numeral 2c is a transmitter that wirelessly transmits the data generated by the data generators 1a, 1b, and 1c. The transmitter 3a, 3b, and 3c receives data wirelessly, and the receiver that can vary the reception frequency 4a. , 4b, 4c
Is a data analyzer 5 for analyzing the data received by the receivers 3a, 3b, 3c and returning it to the original audio signal. Reference numeral 5 is a data generator 1a, a transmitter 2a, a receiver 3a and a data analyzer 4a. A base station having a data generating unit 1b, a transmitting unit 2b, a receiving unit 3b and a data analyzing unit 4b, and 6b a data generating unit 1c, a transmitting unit 2c, a receiving unit 3c and a data analyzing unit 4c. The base station 7 has a control device that can control the mobile radio station 5 and the base stations 6a and 6b. The transmission / reception channels of the base stations 6a and 6b are CH1 and CH2. Also, 8a
B. for measuring the bit error rate of the received signal. E. R. B. Generating measurement data E. R. The measurement data generators 9b and 9c measure the bit error rate of the received signal. E. R. It is a measuring instrument.

Next, the operation will be described with reference to the flowchart of FIG. The mobile radio station 5 sets the transmission / reception channel to CH1 when communicating with the base station 6a, transmits the data generated by the data generation unit 1a from the transmission unit 2a, and analyzes the data received by the reception unit 3a. It is analyzed by the section 4a. Also, the base station 6a sets the transmission / reception channel to CH1 when communicating with the mobile radio station 5, and the data generation unit 1b
The data generated in step S2 is transmitted from the transmission unit 2b, and the reception unit 3
The data received at b is analyzed by the data generator 4b. The mobile radio station 5 is a mobile station. E. R. Measurement data generator 8
a is a predetermined code such as PN (Pseudo Noise) periodically from B.a. E. R. The measurement data is transmitted, and the base station 6a transmits the B. E. R. The B.B.I. E. R. Is measured (step 100). The controller 7 is a B. E. R. B. of the data received by the measuring device 9b. E. R. When it exceeds a certain value (step 101), the base station 6b sends the B. E. R. Is instructed to be received (step 102). B. of the base station 6b. E. R. B. received by the measuring device 9c. E. R. When the value is less than or equal to a certain value (step 103), the control device 7 controls the base station 6a to the base station 6b.
A channel switching instruction is output to the transmission / reception channel CH2 (step 104). If the transmission / reception channel of the base station 6b is CH2, the mobile radio station 5
At 2, the communication with the base station 6b is continued.

As described above, according to the first embodiment, the B.B. E. R. Was measured, and this B. E. R. B of the radio wave from another base station depending on whether or not is larger than the set value. E. R. Of the B.
E. R. Since the communication is performed with the base station with the smaller one, when the received electric field is small, or when the received electric field is large but the level of the interfering wave is large, another base station can be selected. In comparison with the above, there is an effect that a low-cost and highly reliable line can be automatically selected.

Example 2. In the first embodiment, the B. E.
R. Was measured and a channel switching instruction was sent from the control device to the mobile radio station. E.
R. And the most B.I. E. R. You can also choose to choose a smaller line. However, in this case, the communication between the mobile station and the base station may be temporarily interrupted.

The operation in this case will be described below.
The configuration of the equipment is as shown in FIG. 2, and 8b and 8c are B. E. R. B. Generating measurement data E. R. This is a measurement data generation unit, and is provided in the base stations 6a and 6b in this embodiment. Also, 9a is B. E. R. It is a measuring instrument and is provided in the mobile radio station 5 in this embodiment.

Next, the operation will be described with reference to FIG. The base stations 6a and 6b are B.I. E. R. Measurement data generator 8
b, 8c periodically from B.I. E. R. The measurement data is transmitted, and the mobile radio station 5 sends the B. E. R. B. in the measuring unit 9a.
E. R. Is measured (step 200). Mobile radio station 5
B. E. R. B. of the data received by the measuring unit 9a.
E. R. Is greater than a certain value (step 201), the transmission / reception channel is switched to CH2, and the B.
E. R. Is measured (step 202). B. at this time E. R. Is less than or equal to a certain value (step 203),
The mobile radio station 5 sends a channel switching request to the base station 6b (step 204), and the control device 7 controls the base station 6b to be used for communication with the mobile radio station 5.

As described above, according to the second embodiment, the B.B. E. R. Was measured, and this B. E. R. B of the radio wave from another base station depending on whether or not is larger than the set value. E. R. Of the B.
E. R. Since the communication is performed with the base station with the smaller one, when the received electric field is small, or when the received electric field is large but the level of the interfering wave is large, another base station can be selected. In comparison with the above, there is an effect that a low-cost and highly reliable line can be automatically selected.

Example 3. In addition, B. E. R. It is also possible to select the base station by performing error correction coding on the transmission data, transmitting it, performing error correction decoding from the reception data, and counting the number of error bits at that time instead of measuring the .

FIG. 3 shows a block diagram in that case. 10
a, 10b and 10c are error correction coding units that perform error correction coding on the data for transmission generated by the data generation units 1a, 1b and 1c, and 11a, 11b and 11c are reception units 3a,
The error correction decoding units 11b and 11c are error correction decoding units that perform error correction decoding of the data received at 3b and 3c.
A signal corresponding to the number of error bits at the time of decoding is transmitted to the control device 7.

The mobile radio station 5 sets the transmission / reception channel to CH1 when communicating with the base station 6a, and the data generation unit 1
The data generated in a is subjected to error correction coding in the error correction coding unit 10a, wirelessly transmitted from the transmission unit 2a, and the data received in the reception unit 3a is processed in the error correction decoding unit 11a. Perform error correction decoding.

When the base station 6a communicates with the mobile radio station 5, the base station 6a sets the transmission / reception channel to CH1 and the data generated by the data generator 1b is converted into the error correction encoder 10b.
Error correction coding is performed by the error correction decoding unit 11b, and the data received by the receiving unit 3b is transmitted from the transmitting unit 2b.
Error correction decoding is carried out at and is analyzed by the data analysis unit 4b.

At this time, the control unit 7 has the error correction decoding unit 1
If the number of error bits transmitted from 1b is more than the specified value,
The base station 6b is instructed to measure the number of error bits from the mobile radio station 5 on CH1. When the data of the base station 6b is transmitted from the error correction decoding unit 11c, and the number of transmitted error bits is equal to or less than the specified value, the control device 7 controls the base station 6a.
Sends a channel switching instruction to the transmission / reception channel CH2 of the base station 6b, and the transmission / reception channel of the base station 6b also CH
Set to 2. The mobile radio station 5 continues to communicate with the base station 6b on this CH2.

As described above, according to the third embodiment, the base station detects the number of error bits at the time of error correction decoding of data and communicates with the base station having the smaller number of error bits. Since this is done, a different base station can be selected when the received electric field is small, or when the received electric field is large but the level of the interfering wave is large, and data correction decoding can be performed at a lower cost than the conventional one. This has the effect of automatically selecting a highly reliable line.

Example 4. Further, with the same configuration as in the third embodiment, the mobile radio station 5 measures the number of error bits of the line with the base station 6b when the number of error bits of the line with the base station 6a is equal to or more than a specified value. When the mobile radio station 5 is less than the specified value, the mobile radio station 5 and the base station 6b can continue communication by issuing a transmission / reception channel switching request to the control device 7 through the base station 6a.

As described above, according to the fourth embodiment, the mobile radio station detects the number of error bits at the time of error correction decoding of data and communicates with the base station having the smaller number of error bits. Therefore, when the received electric field is small, or when the received electric field is large but the level of the interfering wave is large, another base station can be selected, and data correction decoding can be performed at a lower cost than the conventional one. This has the effect of automatically selecting a highly reliable line.

[0028]

As described above, according to the mobile communication system of the present invention, the bit error rate measurement data transmitted from the mobile radio station is received by the base station, and the bit error rate measurement data is received. Since a base station having a small bit error rate is selected, there is an effect that a system that can perform highly reliable communication without a reception electric field measuring device can be obtained at low cost.

Further, according to the mobile communication system of the present invention, the bit error rate measurement data transmitted from the base station is received by the mobile radio station, and the bit error rate of the bit error rate measurement data is changed. Since a small base station is selected, there is an effect that a system capable of highly reliable communication can be obtained at low cost without requiring a reception electric field measuring device.

Further, according to the mobile communication system of the present invention, both the base station and the mobile radio station perform error correction coding on the data generated by the data generating section, and the data received by the receiving section is erroneous. When performing corrective decoding, the number of error bits is detected in either the base station or the mobile radio station, and the base station with the smaller number of error bits is selected, so a reception electric field measurement device is required. There is an effect that a system that can perform highly reliable communication in which data is corrected and decoded without any cost is inexpensive.

[Brief description of drawings]

FIG. 1 is a block diagram of a mobile communication system according to an embodiment of the present invention.

FIG. 2 is a block diagram of a mobile communication system according to a second embodiment of the present invention.

FIG. 3 is a block diagram of a mobile communication system according to a third embodiment of the present invention.

FIG. 4 is a block diagram of a conventional system.

FIG. 5 is a flowchart showing the operation of the mobile communication system according to the embodiment of the present invention.

FIG. 6 is a flowchart showing the operation of the mobile communication system according to the second embodiment of the present invention.

[Explanation of symbols]

 1a, 1b, 1c data generation unit 2a, 2b, 2c transmission unit 3a, 3b, 3c reception unit 4a, 4b, 4c data analysis unit 5 mobile radio station 6a, 6b base station 7 control device 8a, 8b, 8c B. E. R. Measurement data generator 9a, 9b, 9c B. E. R. Measuring device 10a, 10b, 10c Error correction coding unit 11a, 11b, 11c Error correction decoding unit 12a, 12b Received electric field measuring device

Claims (3)

[Claims] 1. A data generator that generates data to be transmitted, a transmitter that wirelessly transmits data generated by the data generator, and a transmitter that has a variable transmission frequency, and that receives data wirelessly. A receiver having a receiving unit capable of varying a receiving frequency and a data analyzing unit for analyzing data received by the receiving unit; and a bit for generating bit error rate measurement data for measuring a bit error rate of a received signal A mobile radio station having an error rate measurement data generation unit, a data generation unit that generates data to be transmitted, and a transmission unit that wirelessly transmits the data generated by the data generation unit and that can vary the transmission frequency. A transmitter,
A receiver having a receiving unit for receiving data wirelessly and having a variable reception frequency, and a data analyzing unit for analyzing the data received by the receiving unit, and a bit error rate measuring device for measuring a bit error rate of a received signal. And a controller capable of controlling the mobile radio station and the base station so as to select the base station according to the bit error rate. 2. A data generator that generates data to be transmitted, a transmitter that wirelessly transmits the data generated by the data generator, and a transmitter that has a variable transmission frequency, and that receives the data wirelessly. A mobile radio station having a receiver having a reception unit capable of varying a reception frequency and a data analysis unit for analyzing received data, and a bit error rate measuring device for measuring a bit error rate of a reception signal; A transmitter having a data generator that generates data, and a transmitter that wirelessly transmits the data generated by the data generator and that can change the transmission frequency;
Generates bit error rate measurement data for measuring the bit error rate of a received signal, and a receiver having a receiving section that receives data wirelessly and that can change the receiving frequency, and a data analysis section that analyzes the received data A plurality of base stations each having a bit error rate measurement data generating section, and a control device capable of controlling the mobile radio station and the base station so as to select a base station according to the bit error rate. A mobile communication system. 3. A data generation unit that generates data to be transmitted, an encoding unit that performs error correction encoding on the data generated by the data generation unit, and the data generated by the encoding unit is transmitted wirelessly. A transmitter having a transmission unit capable of varying the transmission frequency, a reception unit capable of varying the reception frequency for wirelessly receiving data, and a decoding unit for performing error correction decoding on the data received by the reception unit. ,
A mobile radio station having a receiver having a data analysis unit for analyzing the data generated by the decoding unit, a data generation unit for generating data to be transmitted, and an error in the data generated by the data generation unit. A transmitter having a coding unit that performs correction coding, a transmitter that wirelessly transmits the data generated by the coding unit, and that can vary the transmission frequency, and a device that wirelessly receives data and varies the reception frequency. A plurality of bases having a receiver capable of performing the error correction decoding of the data received by the receiving unit, and a receiver having a data analyzing unit that analyzes the data generated by the decoding unit Station, and the mobile radio station and the base station can be controlled so that the base station is selected according to the number of error bits in error correction decoding of either the base station or the mobile radio station. Mobile communication system, characterized in that a control device.