JPH11341034A - Radio communication system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To suppress power consumption and to effectively utilize a communication channel in a radio communication system. SOLUTION: In the radio communication system provided with a base station 1 having a multi-sector antenna 11 and a terminal station 2 having a multi-sector antenna 21 and capable of executing high speed and large capacity data communication by using a millimeter wave band through a radio channel between both the antennas 11, 21, the base station 1 is connected to the terminal station 2 through antennas 15, 25 to be a radio channel of a band lower than the millimeter wave band, data communication of high speed and large capacity is executed from the base station side by using the millimeter wave band and other information is communicated by using the band through the antenna 15, 25.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a radio communication system having a plurality of antennas and a radio communication device.

[0002]

2. Description of the Related Art Conventionally, a millimeter wave band capable of large-capacity communication,
In wireless communication using a quasi-millimeter wave band, a system using a multi-sector antenna has been studied for the purpose of suppressing multipath fading and improving antenna gain.

For example, as shown in FIG. 27, a terminal station 510 and a base station 500 are provided with multi-sector antennas 511 and 501, respectively, and these multi-sector antennas 511 and 501 are provided with transceivers 512 and 502, respectively. Connected to perform data communication via a wireless line between the multi-sector antennas 511 and 501.

[0004] In the above, TD shown in FIG.
When the D frame is used, one of the multi-sector antennas 501 and the multi-sector antenna 5 in the slot ST1 are used.
One of the antennas 11 is selected and combined, the magnitude of the received power is compared, and switching is performed so that the set of antennas having the largest received power is used in slot ST2 based on the result of the comparison. Also, time slot ST3 is used for data transmission from base station 500, and time slot ST4 is used for data transmission from terminal station 510.

However, in the above radio communication system, each of the base station 500 and the terminal station 510 performs transmission at the same frequency as that for data transmission and reception for controlling the multi-sector antennas 501 and 511.
The terminal station 510 needs the same power consumption as the base station 500. In this case, the millimeter wave band and the quasi-millimeter wave band
It is characterized by large space transport loss and large power consumption. When the terminal station 510 is a personal wireless device, the amount of data transmitted from the terminal station 510 is smaller than that of the base station 5.
There is a problem that the amount of transmission data is extremely small as compared with the transmission data amount from 00, and that there is much waste in using the same band by the TDD method.

For example, as shown in FIG. 29, corresponding to two terminal stations, a multi-sector antenna 6 is provided on the indoor floor side.
11 and 612, a multi-sector antenna 601 of one base station is provided on the ceiling, and a multi-sector antenna 601 of the base station and a multi-sector antenna 61 of one terminal station are provided in the time zone T1.
And a data communication using the multi-sector antenna 601 of the base station and the multi-sector antenna 612 of the other terminal station in the time zone T2 to perform multi-dimensional connection. Are known.

However, the above system uses a multi-sector antenna provided at one place between the base station and one terminal station. There is a problem in that the route is blocked, so-called shadowing occurs, and the line quality deteriorates.

Therefore, a system is known in which the number of multi-sector antennas on the base station side is increased to two as shown in FIG. According to this system, when a person passes between the multi-sector antenna 601 of the base station and the multi-sector antenna 611 of the terminal station and the line quality is deteriorated by shadowing, the multi-sector antenna 602 of the base station is switched to the multi-sector antenna 602. By using this, a communication path can be secured with the multi-sector antenna 611 of the terminal station, and data communication can be performed.

[0009]

However, FIG.
With such a configuration, the number of multi-sector antennas on the base station side increases, and there is a problem that the system becomes large-scale and the cost is high.

[0010] Further, when the line quality is deteriorated when communication is performed using any one of the multi-sector antennas, the antenna switching operation is started, but the communication between the base station and the terminal station is started. When the antennas are far from each other, there is often no antenna among the multi-sector antennas that clears the reference line quality, and the line may be disconnected without switching the antenna.

A radio communication apparatus using a plurality of antennas such as a multi-sector antenna has different characteristics for each of the multi-sector antennas, and cannot perform transmission at the same transmission level when the antennas are switched. Was.

SUMMARY OF THE INVENTION The present invention has been made to solve the problems of the conventional wireless communication systems and wireless communication devices as described above, and has as its object to reduce power consumption and perform communication without waste. It is to provide a possible wireless communication system. Another object of the present invention is to provide a wireless communication system capable of coping with a decrease in line quality due to shadowing, and having a large configuration and no cost increase. Yet another purpose is
An object of the present invention is to provide a wireless communication system capable of securing appropriate switching even when a plurality of antennas are switched and used. Another object of the present invention is to provide a wireless communication apparatus capable of appropriately controlling a transmission level when switching between antennas when a plurality of antennas are switched and used.

[0013]

A radio communication system according to the present invention includes a first radio station having a multi-sector antenna and a second radio station having a multi-sector antenna. In a wireless communication system that performs high-speed and large-capacity data communication using a first band by a wireless line, a low-bandwidth band lower than the first band is established between the first wireless station and the second wireless station. It is characterized in that connection is made via a wireless line of the second band. Thus, high-speed and large-capacity data communication can be performed using the first band, and other information can be communicated using the second band.

[0014] A wireless communication system according to the present invention comprises a first antenna having a multi-sector antenna and at least one single antenna.
And a second radio station having a multi-sector antenna, and monitoring line quality in communication via one of the single antenna of the first radio station and one of the multi-sector antennas of the second radio station; A line quality detecting means for detecting that the line quality has undergone a predetermined deterioration, and when the line quality detecting means detects the deterioration, switching to the multi-sector antenna of the first wireless line is performed. Switching control means. As a result, communication is normally performed using a single antenna, and communication is performed using a multi-sector antenna when the line quality is degraded.

In a wireless communication system according to the present invention, in a wireless communication system in which one of a plurality of antennas is selected for communication, the first switched channel quality level data and the first switched channel quality level A switching level holding unit having at least second switching line quality level data corresponding to lower quality than data; and, when switching antennas, selecting an antenna using data from a higher level of the switching level holding unit. And selecting means. Thereby, since the comparison is performed using the higher one of the switching channel quality level data, the probability that there is no antenna to be switched can be reduced.

A radio communication apparatus according to the present invention is a radio communication apparatus for performing communication by selecting one of a plurality of antennas, wherein output level setting means for setting an output level corresponding to each antenna; Antenna switching means for switching so as to receive the setting of the output level setting means at the time of switching.
Thus, when the antenna is switched, the switching is performed so as to receive the output level setting corresponding to the antenna related to the switching.

A radio communication apparatus according to the present invention is a radio communication apparatus for performing communication by selecting one of a plurality of antennas, wherein: an attenuation level holding means for holding an attenuation level corresponding to each antenna; Antenna switching means for setting the antenna output according to the attenuation level corresponding to the attenuation level holding means and performing switching when the switching is performed. As a result, when the antenna is switched, the antenna output is set based on the attenuation level corresponding to the antenna.

[0018]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a block diagram of a radio communication system according to an embodiment of the present invention; FIG. The description of the operation will be omitted. FIG. 1 shows a wireless communication system according to the present invention. In this system, image data is transmitted from the base station 1 to the terminal station 2 using a millimeter wave band or a quasi-millimeter wave band.

To the base station 1, a data processing device 10 for transmitting image data and controlling each section, an encoder 13 for encoding image data, a high-band transmission for transmitting a signal in a millimeter wave band or a quasi-millimeter wave band. And a multi-sector antenna 11.
1, a high-band receiving unit 22 that receives a millimeter wave band or a quasi-millimeter wave band signal, a decoder 23 that decodes image data,
A data processing device 20 that receives image data and controls each unit is provided. Multi-sector antenna 11, 2
1 is composed of four antennas, and one of the four antennas is selected and used. Therefore, there are 4 × 4 = 16 antenna combinations in the two multi-sector antennas 11 and 21.

Further, the base station 1 and the terminal station 2 are connected to the respective data processing devices 10 and transmit and receive in a band (for example, quasi-microwave, microwave) lower than the band by the multi-sector antennas 11 and 21. , Low-band transmitting / receiving sections 14 and 24 and antennas 15 and 25 are provided. In the first embodiment, the low-bandwidth transmitting / receiving section 1
Communication related to switching control of the multi-sector antennas 11 and 21 is performed via low-speed (wireless) lines of low bandwidth by the antennas 4 and 24 and antennas 15 and 25.

FIG. 4 shows a flowchart of the communication by the above-mentioned system, and the operation will be described with reference to the flowchart. First, the communication of the switching control of the antennas of the multi-sector antennas 11 and 21 is performed using the low-band low-speed line by the low-band transmitting / receiving units 14 and 24 and the antennas 15 and 25 (S
1). For example, the data processing device 10 of the base station 1 selects one antenna by switching the multi-sector antenna 11, and instructs the terminal station 2 to switch to the first antenna. The data processing device 20 of the terminal station 2
In response, the multi-sector antenna 21 is switched,
One antenna is selected and the end of switching is notified to the base station 1 side.

In response to this, the base station 1 measures the received power (electric field strength) using a high-bandwidth high-speed line by the multi-sector antennas 11, 21 and holds the result (S2). It is detected whether the measurement by the combination of all the antennas in S21 has been completed (S21).
3). If the processing has not been completed, the process returns to step S1 to continue the processing. When the measurement using all the antenna combinations in the multi-sector antennas 11 and 21 is completed, the set having the largest received power among the held combinations of the antennas is detected (S4), and the low-bandwidth transmitting / receiving units 14 and 24 are detected. Then, an instruction is transmitted to switch to the antenna of the above set of the multi-sector antennas 21 using a low-speed low-speed line by the antennas 15 and 25 (S5). Next, the image data is transmitted from the data processing device 10 to the encoder 1.
3 (S6).

The image data is encoded and transmitted to the high band transmitting unit 1
2, up-converted to a predetermined band, and transmitted from the multi-sector antenna 11. On the other hand, the terminal station 2 performs reception via the multi-sector antenna 21, and the received signal is down-converted by the high band
The image data is decoded by decoding the image data and sent to the data processing device 20. As described above, the communication of the switching control of the antennas of the multi-sector antennas 11 and 21 is performed using the low-band low-speed line by the low-band transmitting / receiving units 14 and 24 and the antennas 15 and 25, so that the power consumption of the terminal station 2 is reduced. And a multi-sector antenna 11,
21 can be used for original data transmission / reception such as transmission of image data and the like, and there is no waste.

FIG. 2 shows a radio communication system according to a modification of the first embodiment. In this system, base station 1A has two multi-sector antennas 11-1 and 11-1.
1-2 are provided, and these are connected to the high band transmission unit 12 via the changeover switch 16. Selector switch 16
Switching between the multi-sector antennas 11-1 and 11-2 is performed by the data processing device 10. Therefore, each of the multi-sector antennas 11-1 and 11-2 includes four antennas, and one of the two multi-sector antennas is selected by the changeover switch 16, and
One of 1-1 and 11-2 is used. Therefore, base station 1 has eight antennas, and according to multi-sector antennas 11-1, 11-2, and 21 of base station 1 and terminal station 2,
There are 8 × 4 = 32 antenna combinations. In this example, image data is transmitted / received by selecting an optimum one of these combinations.

FIG. 3 shows a wireless communication system according to the second embodiment. This system is a wireless LA
N is a client / server system using low-band transmission / reception units 14 and 24 and low-speed low-speed lines by antennas 15 and 25 to perform communication for antenna switching control of multi-sector antennas 11 and 21 and to perform client 2 server communication.
Communication is performed when the server 18 accesses the server 18 or the like. Then, in response to an access or the like from the client 28 side, data is distributed from the server 18 side through a high-speed line using the multi-sector antennas 11 and 21. According to this system, normally, a large amount of data is transmitted from the server 18 to the client 28, but a small amount of data is transmitted from the client 28 to the server 18. The biased system is operated properly.

FIG. 5 shows a configuration of a base station of the wireless communication system according to the third embodiment. This base station comprises a multi-sector antenna station 3 and a plurality of single antenna stations 5
-1 to 5-4, and a plurality of single antenna stations 5-
When shadowing occurs in any of 1 to 5-4, the corresponding antenna of the multi-sector antenna station 3 is replaced.

The data processing device 4 for transmitting and receiving data is connected to baseband circuits 8-1 to 8-4 for performing signal conversion and modulation / demodulation between an intermediate frequency and a baseband. The intermediate frequency switches 7-1 to 7-4 for switching are connected to -1 to 8-4, and the single antenna stations 5-1 to 5-4 are connected to the intermediate frequency switches 7-1 to 7-4. Is connected. The single antenna stations 5-1 to 5-4 have single antennas 33-1 to 33-4.
And transmission / reception circuits 34-1 to 34-4 respectively connected to these for performing conversion between a high frequency and an intermediate frequency. In this configuration, the baseband circuits 8-1 to 8-8
-4, the conversion to the intermediate frequencies f _{I1 to} f _I4 and the frequency control are performed, so that the multi-sector antenna station 3 and the single antenna stations 5-1 to 5-4 do not require a frequency synthesizer. .

The multi-sector antenna station 3 has an antenna 32
Multi-sector antennas 32 composed of -1 to 32-4 and selection switches 31-1 to 31-4 connected thereto.
And a transmission / reception circuit 30 connected thereto for performing conversion between a high frequency and an intermediate frequency. Transmission / reception circuit 3
Between 0 and the intermediate frequency switches 7-1 to 7-4, a switch 6 for connecting the transmitting / receiving circuit 30 to any one of the intermediate frequency switches 7-1 to 7-4 is provided.

As shown in FIG. 8, a single antenna 33-1
33 to are arranged at different corners of the room, for example, and the multi-sector antenna 32 is arranged at the center of the room. Then, the data processing device 4 normally supplies the single antenna stations 5-1 to 5-4 to the intermediate frequency switches 7-1 to 7-4.
Control is performed to select the side. Then, data is transmitted and received sequentially or simultaneously via the single antennas 33-1 to 33-4.

The data processor 4 is associated with identification information of alternative selector antennas corresponding to each of the single antennas 33-1 to 33-4 as shown in FIG. Table is provided. The table further includes a single antenna 33.
A shadowing level at which switching from -1 to 33-4 to the multi-sector antenna 32 is to be performed is stored.

The data processing device 4 performs the operation shown in the flowchart of FIG. 7, and the operation will be described based on the operation. The data processing device 4 includes transmission / reception circuits 34-1 to 34 of the single antenna stations 5-1 to 5-4 in use.
-4 or alternative multi-sector antenna 3
The reception level is measured via the transmission / reception circuit 30 connected to the transmission line 2 (S7). Then, the shadowing level in the table of FIG. 6 is compared with the reception level (S
8) It is detected whether shadowing has occurred (whether the reception level has fallen below the shadowing level) (S9).
Here, when it is determined that the shadowing has occurred, the multi-sector antenna 32 corresponding to the single antennas 33-1 to 33-4 in which the shadowing has occurred is referred to with reference to the table of FIG. Switching to an antenna is performed, and an alternative flag is set (S10). FIG. 6 shows that switching to the antenna 32-1 in the multi-sector antenna 32 corresponding to the single antenna 33-1 is performed.

Also, as a result of the determination in step S9,
If shadowing has not occurred, it is detected whether switching to the antenna among the multi-sector antennas 32 corresponding to the single antenna is performed with reference to the table of FIG. 6 (S11), and the switching is performed. If not, the operation returns to step S7 to continue the operation, and when switching is performed, switching to a single antenna corresponding to the antenna in the multi-sector antenna 32 is performed with reference to the table of FIG. Reset the corresponding alternative flag (S1
2).

By the above operation, as shown in FIG.
Multi-sector antenna 61 connected corresponding to one terminal station
1 and 612 are provided on the floor side of the room, and when a person enters between the single antenna 33-3 and the multi-sector antenna 611 of the terminal station and shadowing occurs, the base station causes the multi-sector of the base station to change. The corresponding antenna (32-
Communication is performed using 3), and the communication is properly performed by compensating for the deterioration of the line quality due to shadowing.

Note that the measurement of the received power is performed by
When communication is performed by the D method, a TDD frame as shown in FIG.
And a single antenna 33 in the slot ST1.
-1 is used, the received power is measured, and slot S
At T2, the reception power when the single antenna 33-2 is used is measured, the reception power when the single antenna 33-3 is used is measured at the slot ST3, and the single antenna 33-4 is measured at the slot ST4. , And the transmission of data that should be originally transmitted by the frame in slot ST5 can be performed using a single antenna or an alternative antenna of a multi-sector antenna. This way,
In each frame, each single antenna 33-1 to 33-33
4 Measurement of the received power is performed, and it is possible to always shift to a stable state by switching the antenna.

FIG. 11 shows a configuration of a receiving unit in a base station or a terminal station of the radio communication system according to the fourth embodiment. This station is plural (here 4)
The communication is performed by selecting any one of the antennas 41-1 to 41-4. The antennas 41-1 to 41-4 are a plurality of single antennas or a multi-sector antenna. Each of the antennas 41-1 to 41-4 has an amplifier 42-1.
To amplifiers 42-1 to 42-4.
The output of 2-4 is provided to the detector 43 and the communication / data processing device 40. The detector 43 is a circuit for detecting the received power (electric field strength), and its output is supplied to an A / D converter 44, where it is converted into a digital signal.

The output of the A / D converter 44 is
The control signal is supplied to a control circuit 45 which performs switching from −1 to 41-4. The control circuit 45 sets the amplification degrees of the amplifiers 42-1 to 42-4 to "0" to thereby control the antennas 41-1 to 41-4.
The output of the antennas 41-1 to 41-4 is passed by switching off the output of the antenna -4 and setting the amplification degree to a predetermined value, thereby performing switching.

The control circuit 45 includes a switching table as shown in FIG. 12 (initially, the antenna identification information and the reception level are not stored) and a switching reception level as shown in FIG. BER (bit error
Rate) table, and operates according to a program of a flowchart as shown in FIG.
This will be described. The switching reception level of the second entry of the switching reception level / BER table is lower than the switching reception level of the first entry.

First, the reception level is detected via the detector 43 and the A / D converter 44 while switching the antennas 41-1 to 41-4 (S21), and the reception level is stored in the table shown in FIG. A table is created by writing the antenna identification information and the reception level (S22). And FIG.
Antennas are selected in accordance with the order of the table (S2).
3) Compare with the switching reception level of the first entry of the switching reception level / BER table shown in FIG. 13 to detect whether the reception level is higher than the switching level (S2).
4). Here, when the reception level is higher than the switching level, the line is established (S25), and communication is continued. On the other hand, when the reception level is lower than the switching level, the table of FIG. It is detected whether or not an antenna remains (S26). If there is an antenna of the next candidate, the process returns to step S23, where an antenna is selected in accordance with the order of the table, and the processing from step 24 is performed.

If the reception levels of all the antennas 41-1 to 41-4 are lower than the switching reception level of the first entry of the switching reception level / BER table shown in FIG. It is detected whether or not there is a next candidate for the switching reception level in the switching reception level / BER table shown in FIG. 13 (S27). here,
Since the switching reception level of the second entry is stored, the switching reception level is changed (S28), the process returns to step S23, the first antenna is selected according to the order of the table, and the processing from step S24 is performed. .

As described above, first, an antenna is selected in accordance with the order of the table using the switching reception level of the first entry, and whether the line quality is appropriate is detected, and a process of detecting an appropriate antenna is performed. If there is no suitable antenna, an appropriate antenna is searched using the switching reception level lower than the switching reception level of the first entry, so that the probability of detecting the appropriate antenna increases, and the appropriate antenna cannot be detected. Prevents the disconnection of the line. Note that the number of switching reception level entries may be three or more.

FIG. 15 shows a configuration of a receiving unit in a base station or a terminal station of the wireless communication system according to the fifth embodiment. In this embodiment, a configuration is adopted in which a bit error rate is calculated by a BER measuring circuit 47 instead of the detector 43, and this is digitized by an A / D converter 44 and transmitted to a control circuit 46. I have.

The control circuit 46 has a switching table as shown in FIG. 12 (initially, antenna identification information and BER are not stored), and a switching reception level and a switching level as shown in FIG. A BER table is provided, and the operation is performed by a program in a flowchart as shown in FIG. The switching BER of the second entry of the switching reception level / BER table corresponds to a case where the line quality is lower than the switching BER of the first entry.

As apparent from FIG. 16, the operation of the control circuit 46 uses a switched BER in place of the switched reception level in the flowchart of FIG. 14, and calculates and compares the bit error rate by the BER measuring circuit 47. However, since the processing is basically the same as the processing in the flowchart of FIG.

As described above, first, an antenna is selected in accordance with the order of the table using the switching BER of the first entry, and whether the line quality is appropriate is detected, and a process of detecting an appropriate antenna is performed. If there is no appropriate antenna, an appropriate antenna is searched by using the switching BER of the second entry. Therefore, the probability that an appropriate antenna is detected is increased. To prevent. The number of switching BER entries may be three or more.

FIG. 17 shows a configuration of a receiving unit in a base station or a terminal station of the radio communication system according to the sixth embodiment. This embodiment combines the configuration of FIG. 11 and the configuration of FIG. 15, and performs antenna switching using both the reception level and the BER.

That is, the operation is as shown in the flowchart of FIG. First, antenna switching is performed using the switching reception level of the first entry in the table of FIG. 13 (S51), and it is detected whether or not a line has been established (S52). If the line has been established, communication is continued. If the line is not established, switch BE of the first entry
The antenna is switched using R (S53), and it is detected whether the line has been established (S54). If the line has been established, the communication is continued.
The antenna is switched using the switching reception level of the second entry in the table of FIG. 13 (S55), and it is detected whether or not the line has been established (S56). If the line has been established, the communication is continued and the line is established. If not, the antenna is switched using the switching BER of the second entry (S57).

According to this embodiment, the number of objects to be compared increases, and the problem that the line is disconnected due to the failure to detect an appropriate antenna is prevented. Note that the number of switching threshold (reception level, BER) entries may be three or more.

FIG. 19 shows a configuration of a transmitting section in a base station or a terminal station of the radio communication system according to the seventh embodiment. This station is plural (here 4)
The communication is performed by selecting any one of the antennas 51-1 to 51-4. The antennas 51-1 to 51-4 are a plurality of single antennas or a multi-sector antenna. Each of the antennas 51-1 to 51-4 has an amplifier 52-1.
To 52-4, and the amplifiers 52-1 to 5-4 are provided.
The input side of 2-4 is connected to the distributor 53.

This station is provided with a communication / data processing device 59 for transmitting data and converting a baseband signal to an intermediate frequency. The output of the communication / data processing device 59 is attenuated by the variable attenuator 56 and sent to the mixer 54. The mixer 54 is connected to a local oscillator 55, which performs conversion into a predetermined band such as a millimeter wave band.

The variable attenuator 56 is configured to be supplied with a setting signal from any of the voltage setting circuits 58-1 to 58-4 via the changeover switch 57, and to switch the amount of attenuation. The control circuit 50 controls the amplifier 5
By setting the amplification degree of 2-1 to 52-4 to "0", the output of the antennas 51-1 to 51-4 is cut off, and by setting the amplification degree to a predetermined value, the antennas 51-1 to 51-4 are turned off. An antenna is selected by passing the output, and a control signal is given to the changeover switch 57 so that the attenuation amount is set in accordance with the selected antenna. Voltage setting circuits 58-1 to 58-4 each output necessary setting signals. This setting signal is supplied to the voltage setting circuits 58-1 to 58-1.
The output of 58-4 is adjusted, for example,
2-4, the output level of each of the amplifiers 52-1 to 5-5 is detected.
The output levels 2-4 have the same predetermined value.

The control circuit 50 performs processing according to a flowchart as shown in FIG. 24, for example, based on an antenna switching instruction from a base station or the like. That is, it waits for the arrival of the antenna switching instruction and detects whether switching is necessary (S61). Then, when an antenna switching instruction arrives, an instruction signal is transmitted to the amplifiers 52-1 to 52-4 so that an antenna based on the instruction or determined by itself is selected, and an attenuation amount corresponding to the selected antenna is transmitted. A control signal is given to the changeover switch 57 so that

As described above, for example, switching from the antenna 51-1 to the antenna 51-4 is performed. For the variable attenuator 56, for example, the voltage setting circuit 58
A setting signal of the voltage setting circuit 58-4 is provided instead of −1, and this setting signal changes the attenuation of the variable attenuator 56. As a result, the antennas 51-1 to 51-1
Regardless of the switching to -4, the output level becomes the same predetermined value.

When the antennas 51-1 to 51-4 are the antennas of the multi-sector antenna 51, the transmission power of each antenna 51-1 to 51-4 is equal as shown in FIG. The range of SA-1 to SA-4 is the same.

FIGS. 21 and 22 show a voltage setting circuit 58-.
The output of the service area SA-1
It shows that the range of ~ SA-4 can be varied. In the example of FIG. 21, for example, the transmission power when the antenna 51-4 is selected and the setting signal is output from the voltage setting circuit 58-4 is smaller than the transmission power of each of the antennas 51-1 to 51-3. As described above, the voltage setting circuit 58-4
What is necessary is just to change the value of the setting signal output from. Also, in the example of FIG.
1-3, and the transmission power when the setting signal is output from the voltage setting circuits 58-4 and 58-3 is reduced by each antenna 5
What is necessary is just to change the value of the setting signal output from the voltage setting circuits 58-4 and 58-3 so as to be smaller than the transmission power of 1-1 and 51-2. In this way, service areas of various sizes can be provided.

FIG. 23 shows a configuration of a transmitting section in a base station or a terminal station of the wireless communication system according to the eighth embodiment. In this configuration example, the CPU 60 controls the attenuation of the variable attenuator 56 in the configuration of FIG. The attenuation control data of the variable attenuator 56 output from the CPU 60 is D / A
The data is converted by the converter 62 into an analog signal, and is supplied to the variable attenuator 56. In addition, the CPU 60
The amplifiers 52-1 to 52-4 are controlled via the O port 61, and their outputs are inhibited / released.

The CPU 60 controls each of the antennas 51-1 to 51-1.
A table as shown in FIG. 25 in which data to be output to the D / A converter 62 is stored in accordance with the selection of -4. The contents of this table are digitized data of the outputs of the voltage setting circuits 58-1 to 58-4 in the case of the configuration of FIG.

The CPU 60 having the above configuration operates according to the flowchart shown in FIG. 26, for example, based on an antenna switching instruction from a base station or the like. That is, the CPU 60
Waits for the arrival of an antenna switching instruction from a base station or the like, and detects whether or not switching is necessary (S63). Then, when an antenna switching instruction arrives, an antenna is determined based on the instruction or selected by itself, so a table search of FIG. 25 is performed (S64), an output is given to the I / O port 61, and the amplifiers 52-1 to 52-1 are output. 52-4 so that the output signal from the communication / data processing device 59 arrives at the selected antenna by prohibiting / releasing the output, and the output data corresponding to the corresponding antenna in the table. Is output to the D / A converter 62 (S65). As a result, the attenuator 56 corresponding to the selected antenna
Attenuates with a required amount of attenuation, and the output level of the antenna can be adjusted as desired.

[0058]

As described above, according to the radio communication system of the present invention, the radio communication system includes the first radio station having the multi-sector antenna and the second radio station having the multi-sector antenna. In a wireless communication system for performing high-speed and large-capacity data communication using a first band by a wireless line between sector antennas, the first band is transmitted between the first wireless station and the second wireless station. Since the connection is made via a lower-band second-band wireless line, high-speed and large-capacity data communication is performed using the first band, and other information is communicated using the second band. The band used can be appropriately divided and used as needed, and a rational system can be provided.

As described above, according to the wireless communication system of the present invention, communication is normally performed using a single antenna, and communication is performed using a multi-sector antenna when the line quality is degraded. A system can be constructed without increasing the number of antennas, and an inexpensive and rational system can be provided.

As described above, according to the wireless communication system of the present invention, in a wireless communication system in which one of a plurality of antennas is selected for communication.
And at least second switched line quality level data corresponding to a lower quality than the first switched line quality level data, and comparing using the higher switched line quality level data. Therefore, the probability that there is no antenna to be switched can be reduced, and problems such as line disconnection can be prevented.

As described above, according to the radio communication apparatus of the present invention, in a radio communication apparatus which performs communication by selecting one of a plurality of antennas, an output level is set corresponding to each antenna. Since the switching is performed so as to receive the setting of the output level setting unit when the antenna is switched, the switching is performed so that the output level becomes appropriate by the switching of the antenna.

As described above, according to the wireless communication apparatus of the present invention, in a wireless communication apparatus that performs communication by selecting one of a plurality of antennas, the attenuation level is maintained for each antenna. Since the antenna output is set based on the corresponding attenuation level held when the antenna is switched, the antenna output can be controlled by setting the antenna attenuation level to a predetermined value by switching the antenna.

[Brief description of the drawings]

FIG. 1 is a configuration diagram of a wireless communication system according to a first embodiment of the present invention.

FIG. 2 is a configuration diagram of a modified example of the wireless communication system according to the first embodiment of the present invention.

FIG. 3 is a configuration diagram of a wireless communication system according to a second embodiment of the present invention.

FIG. 4 is a flowchart for explaining an operation of the wireless communication system according to the first embodiment of the present invention.

FIG. 5 is a configuration diagram of a wireless communication system according to a third embodiment of the present invention.

FIG. 6 is a diagram showing contents of a table used in a wireless communication system according to a third embodiment of the present invention.

FIG. 7 is a flowchart for explaining an operation of the wireless communication system according to the third embodiment of the present invention.

FIG. 8 is a plan view showing an antenna arrangement of a wireless communication system according to a third embodiment of the present invention.

FIG. 9 is a side view for explaining the operation of the wireless communication system according to the third embodiment of the present invention.

FIG. 10 is a diagram showing the contents of a TDD frame used in a wireless communication system according to a third embodiment of the present invention.

FIG. 11 is a configuration diagram of a wireless communication system according to a fourth embodiment of the present invention.

FIG. 12 is a diagram showing contents of a table used in a wireless communication system according to a fourth embodiment of the present invention.

FIG. 13 is a diagram showing contents of a table used in a wireless communication system according to a fourth embodiment of the present invention.

FIG. 14 is a flowchart illustrating an operation of the wireless communication system according to the fourth embodiment of the present invention.

FIG. 15 is a configuration diagram of a wireless communication system according to a fifth embodiment of the present invention.

FIG. 16 is a flowchart for explaining the operation of the wireless communication system according to the fifth embodiment of the present invention.

FIG. 17 is a configuration diagram of a wireless communication system according to a sixth embodiment of the present invention.

FIG. 18 is a flowchart illustrating an operation of the wireless communication system according to the sixth embodiment of the present invention.

FIG. 19 is a configuration diagram of a wireless communication system according to a seventh embodiment of the present invention.

FIG. 20 is a diagram showing a service area of each antenna controlled by the wireless communication system according to the seventh embodiment of the present invention.

FIG. 21 is a diagram showing a service area of each antenna controlled by the wireless communication system according to the seventh embodiment of the present invention.

FIG. 22 is a diagram showing a service area of each antenna controlled by the wireless communication system according to the seventh embodiment of the present invention.

FIG. 23 is a configuration diagram of a wireless communication system according to an eighth embodiment of the present invention.

FIG. 24 is a flowchart for explaining the operation of the wireless communication system according to the seventh embodiment of the present invention.

FIG. 25 is a diagram showing contents of a table used in a wireless communication system according to an eighth embodiment of the present invention.

FIG. 26 is a flowchart illustrating an operation of the wireless communication system according to the eighth embodiment of the present invention.

FIG. 27 is a configuration diagram of a conventional wireless communication system.

FIG. 28 shows a TDD used in a conventional wireless communication system.
The figure which shows the content of a frame.

FIG. 29 is a diagram showing an antenna arrangement of a conventional wireless communication system.

FIG. 30 is a diagram showing shadowing in a conventional wireless communication system.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 Base station 2 Terminal station 11, 21 Multi-sector antenna 12 High band transmission part 13 Encoder 14 Low band transmission / reception part 15, 25 antenna 22 High band reception part 23 Decoder 24 Low band transmission / reception part

Claims (11)

[Claims] 1. A wireless communication system comprising: a first wireless station having a multi-sector antenna; and a second wireless station having a multi-sector antenna. In a wireless communication system for performing large-capacity data communication, the first wireless station and the second wireless station are connected to each other by the first wireless station.
A wireless communication system connected via a wireless line of a second band lower than the band of the second band. 2. A transmission from a first radio station to a second radio station through a radio band of a first band, and selection control of a multi-sector antenna is performed by a radio line of a second band. The wireless communication system according to claim 1, wherein 3. The wireless communication system according to claim 1, wherein the second wireless station accesses the first wireless station via a line of the second wireless band. 4. The first radio station is provided with a plurality of multi-sector antennas.
The wireless communication system according to any one of the above items. 5. A first radio station having a multi-sector antenna and at least one single antenna; a second radio station having a multi-sector antenna; a single antenna of the first radio station and a second radio station. Line quality detection means for monitoring the line quality in communication via one of the multi-sector antennas and detecting that the line quality has undergone a predetermined deterioration; and when the line quality detection means has detected the deterioration. In
Switching control means for switching the first wireless line to a multi-sector antenna. 6. A single antenna of a first wireless station, at least one of a multi-sector antenna replaced by switching.
The wireless communication system according to claim 5, further comprising a table associated with one of the plurality, wherein the switching control unit performs switching using the table. 7. A wireless communication system for performing communication by selecting one of a plurality of antennas for communication, wherein the first switched channel quality level data and the lower quality than the first switched channel quality level data are supported. Switching level holding means having at least second switching channel quality level data to be switched, and selecting means for selecting an antenna by using data from the higher level of the switching level holding means when switching antennas. The wireless communication system according to claim 6, wherein: 8. The wireless communication system according to claim 6, wherein the line quality is determined based on a received electric field strength. 9. The wireless communication system according to claim 6, wherein the line quality is determined based on a bit error rate. 10. A wireless communication apparatus for performing communication by selecting one of a plurality of antennas for communication, comprising: an output level setting means for setting an output level corresponding to each antenna; An antenna switching means for performing switching so as to receive the setting of the output level setting means. 11. A wireless communication apparatus for performing communication by selecting one of a plurality of antennas for communication, comprising: an attenuation level holding unit for holding an attenuation level corresponding to each antenna; A wireless communication apparatus comprising: an antenna switching unit configured to set an antenna output according to a corresponding attenuation level of an attenuation level holding unit and perform switching.