JP2000286783A - Fixed radio terminal, radio base station and communication system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To automatically change the radiation pattern direction of the directional antenna of a fixed radio terminal by deciding the radiation pattern direction in accordance with the content of a radiation pattern direction designation signal and controlling a radiation pattern change means in accordance with the direction. SOLUTION: When the antenna 15A of a terminal 15 is to be directed to a new base station 20 with the installation of the new base station 20, a base station 11 receiving a trigger designating an increase processing from a center device 21 transmits an antenna control instruction AI containing antenna coordinate values corresponding to the position of the new base station 20 to the terminal 15. A new antenna 15A coordinate values after change are calculated from the present coordinate values of the position of the antenna 15A in the terminal 15 based on the instruction AI. Then, the antenna 15A is directed to the new base station 20 and the terminal 15 communicates with the new base station 20. When the base station 11 is to be deleted from a radio telemeter system 10, the base station 11 receiving a deletion trigger from the center device 21 directs the antenna 16A of a terminal 16 to the base station 12 before deletion and then deletes the base station 11.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a communication system, and is applicable to, for example, a wireless telemeter system.

[0002] The present invention also relates to a wireless fixed terminal as a component of such a communication system.

Further, the present invention relates to a radio base station as a component of such a communication system.

[0004]

2. Description of the Related Art In a conventional fixed communication system, for example, a fixed system for a dedicated line such as a microwave fixed communication (telephone line or the like) using a Panapona antenna or the like, once a station is installed, the direction between the two stations becomes: There was no need to switch directions because it did not change semi-permanently.

In such inter-station communication, one-to-one communication is normally performed between two microwave fixed communication stations and the number of stations is small, so that it is necessary to change the direction. In that case, the change had to be made manually.

[0006]

However, even in a fixed communication system, the number of fixed terminals multiplexed by CDMA (code division multiple access) is, for example, several hundred per base station, and the number of base stations is 1000 per system. A communication system that reaches stations and accommodates hundreds of thousands of fixed terminals in one system as a whole is also conceivable.

[0007] For example, in such a communication system to which a radio telemeter system can be applied, it is considered that the number of base stations needs to be frequently increased, decreased, or changed due to factors such as increase, decrease, or change of subscribers.

[0008] Even in such a system, since each fixed terminal usually needs to communicate with one predetermined base station, a change in the direction of the directional antenna on the terminal side corresponds to an increase or decrease in the number of base stations. It must be done as soon as possible. This is because, if the change in the direction of the directional antenna is delayed, the terminal cannot normally communicate with the base station during the delay, and it is highly likely that a malfunction will occur in system operation.

The large number of fixed terminals means that a great deal of labor is required when a person changes the direction of the directional antenna individually.

[0010] That is, unless the direction of the directional antenna is changed for many corresponding terminals immediately and almost simultaneously in response to the increase or decrease of the base stations, fairness and reliability in system operation cannot be maintained. .

Further, a great deal of labor leads to an increase in costs for maintaining and expanding the system.

To cope with these problems, it is conceivable to use an omni-directional antenna in a horizontal plane as an antenna provided in a terminal, such as a CDMA mobile phone.

However, in CDMA, the same frequency band is used in cells that are geographically adjacent to each other. Therefore, an incoming wave transmitted from a terminal located in a boundary area between the own cell and the adjacent cell is transmitted to the own cell base station. This has substantially the same effect as when the number of terminals existing in the own cell increases.

That is, similarly to the case where the number of terminals simultaneously transmitting to the own cell base station increases, the CN ratio (carrier-to-noise ratio) of the base station deteriorates in the uplink channel.

[0015] Deterioration of communication quality, such as deterioration of the CN ratio, reduces the number of terminals that can simultaneously transmit to the base station, and lowers system capacity.

CD using omnidirectional antenna on terminal side
In order to cope with this problem, the MA mobile phone system performs complicated control such as shifting the code detection timing by synchronizing signals between base stations or shifting the emission timing of radio waves when there is no sound.

Also, in the downlink channel, for example, when a mobile phone is located near a cell boundary, incoming waves from two or more base stations exist, and similar degradation of the CN ratio occurs. To cope with this, complicated control such as site diversity is required.

In other words, in a mobile phone system or the like in which the terminal moves, the terminal cannot be equipped with a directional antenna, and it is necessary to perform complicated control as described above. Since is a fixed terminal, it has the advantage that it can be equipped with a directional antenna and does not require complicated control like a mobile phone.

That is, in the wireless telemeter system,
By using the terminal-side antenna as a directional antenna, the transmission power of a terminal located in a boundary area with an adjacent cell and belonging to the adjacent cell is negligible for the own cell base station due to the antenna gain of the directional antenna. Can be reduced to
Therefore, the own cell base station can improve the CN ratio under the influence of only the arriving wave transmitted from the terminal belonging to the own cell, so that it does not need to use complicated control such as a mobile phone system. Can also increase communication quality and system capacity.

[0020] Similarly, in the wireless telemeter system, it is possible to easily improve the communication quality when the terminal receives.

Therefore, if the above-mentioned problems, such as the problem of a great deal of labor caused by a person individually changing the direction of the directional antenna of the terminal while maintaining such advantages, are solved, the communication quality and the system can be improved. Despite the high capacity,
An efficient communication system with simple control can be constructed.

[0022]

According to a first aspect of the present invention, there is provided a wireless fixed terminal which is provided with a directional antenna for wirelessly communicating with a wireless base station and is fixedly installed. 1) radiation pattern changing means for changing the direction of the radiation pattern of the directional antenna;
(2) designation signal detection means for detecting, from among the signals transmitted from the radio base station, a radiation pattern direction designation signal serving as a basis for determining the direction of the radiation pattern of the directional antenna; A radiation pattern direction control unit that determines a direction of the radiation pattern according to the content of the radiation pattern direction designation signal and controls the radiation pattern changing unit according to the determined direction of the radiation pattern.

According to the second aspect of the present invention, in the wireless base station of the communication system accommodating the wireless fixed terminal having the directional antenna, the radiation pattern direction designation signal for designating the direction of the radiation pattern of the directional antenna is provided. It is characterized by comprising a designated signal transmitting means for transmitting to a wireless fixed terminal.

Further, a communication system according to a third aspect of the present invention comprises a wireless fixed terminal according to claim 1 or 2 and a wireless fixed terminal according to claim 3 or 4.
And a wireless base station.

[0025]

DESCRIPTION OF THE PREFERRED EMBODIMENTS (A) Embodiment Hereinafter, an embodiment will be described with an example in which a wireless fixed terminal, a wireless base station, and a communication system according to the present invention are applied to a wireless telemeter system using a CDMA system. explain.

In a wireless telemeter system, meter metering information and the like are automatically transmitted by wireless communication between a terminal installed in the user's home connected to a meter in the user's home such as a water meter and a base station of the terminal. Can be collected and accumulated.

In such a wireless telemeter system,
Control data is transmitted on the downlink channel from the base station to the terminal, and meter measurement information is transmitted on the uplink channel from the terminal to the base station.

(A-1) Configuration of the Embodiment FIG. 4 shows a wireless telemeter system 10 of the present embodiment. Although shown in a simplified manner in FIG. 4, one wireless telemeter system accommodates, for example, about 1000 base stations, and each base station accommodates, for example, about several hundred terminals. You.

In FIG. 4, adjacent base stations 11 and 12
Cover the geographical area indicated by cells 13 and 14, respectively.

The terminal devices 15 to 18 are connected by wire to water meters at user's homes at each point and are fixedly installed. Terminals 15 and 16 communicate with base station 11 and
And 18 communicate with the base station 12. Each terminal communicates with only one base station. For example, it is assumed that it is impossible for the terminal 16 to communicate with the base station 12 or the terminal 17 to communicate with the base station 11 in a normal operation state. .

The antennas 15A-
Numeral 18A is a directional antenna shared for transmission and reception, and the center of the radiation pattern in normal operation (usually coincides with the maximum radiation direction) is directed toward one base station that is a communication partner. For example, the antenna 1 of the terminal 15
The center of the radiation pattern of 5A is directed to the base station 11, and the center of the radiation pattern of the antenna 18A of the terminal 18 is the base station 1.
2 oriented.

As a result, the antenna gain of antenna 15A of terminal 15 becomes sufficiently large in the direction of base station 11 and sufficiently in the direction in which another base station such as base station 12 can exist. Become smaller. Similarly, terminal 18
The antenna gain of the antenna 18A is sufficiently large only in the direction of the base station 12 and sufficiently small in the other directions.

By the so-called reciprocity theorem of the antenna, the transmission gain of the antenna is usually equal to the reception gain of the antenna, and the radiation pattern (transmission pattern) is equal to the absorption pattern (reception pattern). It also means the direction of the absorption pattern.

Specific examples of the directional antennas 15A to 18A may be, for example, a dipole antenna, a parabolic antenna, or the like. And each antenna 15A-1
The installation location of the 8A user's house may be on the roof of the user's house, on a roof, or the like, for example, as in a Yagi antenna for television reception.

As an example, it is assumed that the communication between the terminals 15 to 18 and the corresponding base station is CDMA bidirectional communication using a frequency band of 2.4 to 2.5 GHz.

The center device 21 connected to the base stations 11 and 12 is an information processing device that accumulates metering information collected from each terminal by each base station and performs a tallying process. The center device 21 has a function of giving a trigger indicating the start of increase / decrease and change processing performed by each base station (or terminal) in response to the increase / decrease / change of the base stations 11 and 12 and the like. ing.

Since all of the terminals 15 to 18 have the same internal configuration shown in FIG. 1, FIG. 1 will be described as showing the internal configuration of the terminal 15.

In FIG. 1, the device body 15B of the terminal 15
The external interface unit 30 provided therein includes a serial interface and a level converter, and is a circuit for transmitting and receiving data to and from the external device ED1. In the present embodiment, the external device ED1 is a water meter.

The control unit 31 in the apparatus body 15B
U, ROM, RAM, and EEPROM.
5 is a circuit that performs overall control and transmits and receives data in accordance with a communication procedure with the base station 11 and a communication procedure with the external device ED1. Assume that the RAM or the like stores data of antenna coordinate values corresponding to the position of the antenna 11A of the base station 11 to which the antenna 15A is currently pointing.

The control unit 31 transmits and receives data and information to and from the baseband signal processing unit 32.
Equipped with a function to monitor failure status.

The baseband processing unit 32 connected to the control unit 31 controls the wireless communication procedure of the physical layer,
This circuit has a function of performing communication channel coding and transmission frame assembling processing on information data received via the control unit 31, performing spreading and band limitation, and transmitting the data to the wireless unit 33.

The signal processing section 32 also performs various processes such as despreading, channel decoding, and error detection on the signal received from the radio section 33, and supplies decoded data and an error detection result to the control section 31. .

The signal processing unit 32 also has a function of performing a so-called closed-loop control for controlling the transmission power of the own station in accordance with an instruction from the base station 11.

The radio section 33 connected to the baseband processing section 32 includes a transmitting section, a receiving section, and a transmitting / receiving section (not shown).

The transmitting section performs QPSK modulation on the spread-modulated signal received from the signal processing section 32 to convert the signal into an RF signal, and transmits the RF signal to the duplexer 34. The receiving section transmits the RF signal received from the duplexer 34. The signal is demodulated into a baseband signal and transmitted to the signal processing unit 32.

The transmitting / receiving section generates a necessary frequency and supplies it to the transmitting section and the receiving section.

The transmission / reception duplexer 34 filters the signal supplied from the transmission section in the radio section 33 to remove unnecessary waves, and then transmits the signal to the transmission / reception antenna 15A, while transmitting the RF signal received by the antenna 15A. From the signals, a signal in a predetermined frequency band is filtered and supplied to the receiving unit in the wireless unit 33.

The duplexer 34 is designed to have sufficient isolation so that the transmission RF signal does not leak to the reception path.

The radio section 33 connected to the baseband processing section 32 converts the signal processed by the baseband processing section 32 into a radio signal and converts the received radio signal into a signal required by the baseband processing section 32. Is a circuit that converts the

As described above, the antenna 15A is an antenna having a single directivity, and its direction is controlled by the motor 37. That is, the directing direction (the direction toward the center of the radiation pattern) can be changed in the horizontal plane by mechanical movement using the motor 37 as a power source.

The rotational movement of the motor 37 is controlled by the control unit 31 via the control line 36. This control includes a control direction that determines the rotation direction of the motor 37 and a control amount that determines the amount of rotation. That is, the direction of the antenna 15A is uniquely determined by the control amount and the control direction.

The power supply unit 3 provided in the terminal 15
5 supplies necessary DC power to each unit in the terminal device 15 by, for example, converting a 12-volt DC input.

The terminal 15 is placed at the user's house, for example, the apparatus main body 15B is installed near the water meter ED1, and the antenna 15A (including the motor 37) installed on the roof and the apparatus main body 15B are connected by a control line 36 or the like. It will be connected by wire.

However, if necessary, the apparatus main body 15B may be installed on the roof together with the antenna 15A, or the antenna 15A may be installed near the water meter ED1 together with the apparatus main body 15B.

Next, the configuration of the base station will be described.

Since both base stations 11 and 12 have the same internal configuration shown in FIG. 2, FIG. 2 will be described as showing the internal configuration of base station 11 communicating with terminal 15.

In FIG. 2, the device main body 11 of the base station 11
B includes an external interface unit 40, a control unit 41, a baseband processing unit 42, a wireless unit 43, a duplexer 44, and a power supply unit 45.

Since these structures correspond to the internal structure of the device main body 15B of the terminal 15, detailed description thereof will be omitted.

That is, the external interface unit 40 corresponds to the external interface unit 30, the control unit 41 corresponds to the control unit 31, the baseband processing unit 42 corresponds to the baseband processing unit 32, and the radio unit 43 Corresponds to the radio unit 33, the duplexer 44 corresponds to the duplexer 34, and the power supply 45 corresponds to the power supply 35.

However, the details of the specifications of the circuits 40 to 45, such as the point that the input of the power
It may be different from the circuits 30 to 35 described above.

In the present embodiment, unlike the antenna 15A of the terminal 15, the antenna 11A of the base station 11 is an omni-directional antenna in a horizontal plane, and therefore has a motor for rotating it. The center device 21 corresponds to the external device ED2 to which the external interface unit 40 is connected by wire.

It is to be noted that a system configuration in which the base station is equipped with a directional antenna is also possible.
A motor for rotating the antenna may be mounted on the base station.

Hereinafter, the operation of the present embodiment having the above configuration will be described.

(A-2) Operation of the Embodiment In the present embodiment, each of the terminals 15 to 18 uses the X-axis coordinate and the Y-axis of the position of its own station in the horizontal plane by some method.
It is assumed that the axis coordinates are known in advance.

In this embodiment, at the time of the first installation, the GPS
(G1oba1 Positioning System
m) It is assumed that each terminal recognizes the location of its own installation location from information and stores it. This storage is stored and held in the control unit 31, for example.

Of course, the GPS information may be received when necessary without storing and holding.
A method not using the PS may be used.

When it is necessary to change the direction of the antenna of the terminal device due to increase / decrease or change of the base station, the center device 21 first supplies an operation start trigger to the corresponding base station.

For example, in FIG. 4, a new base station 20 indicated by a broken line is installed (increased),
When it is desired to direct the antenna 15A of the terminal 15 which has been directed to the base station 20 to the base station 20, the base station 11 which has received the trigger for designating the increase processing from the center apparatus 21 transmits the trigger to the terminal 15 as shown in FIG. An antenna control command AI having a data configuration is transmitted.

In FIG. 3, an instruction type section IT is a section indicating that this data is an antenna control instruction.
It is also used for identification of other instructions.

The X-axis coordinate data part XD stores the new base station 2
This is a portion indicating the X-axis coordinate of the position of 0, and is set to longitude in the present embodiment. Similarly, the Y-axis coordinate data portion YD is a portion indicating the Y-axis coordinate of the position of the base station 20, and in the present embodiment, indicates the latitude.

That is, according to the antenna control command AI, the antenna coordinate values (XD, YD) corresponding to the position of the new base station 20 (strictly, the position of the antenna 20A of the base station 20) are set.
D) is sent.

The terminal 15 that has received the antenna control command AI receives the current coordinate value of the antenna 15A (corresponding to the position of the antenna 11A of the base station 11) and the antenna coordinate value of the received data (the antenna 20A of the base station 20). Position XD,
YD) and the position of the antenna 15A of the own station, the control direction and control amount of the motor 37, that is, which direction the antenna 15A should be rotated and how many times should be calculated using a predetermined calculation. , The direction of the antenna 15A is changed via the control line 36.

As a result, the antenna 15A is directed to the new base station 20, and thereafter, the terminal 15 communicates with the base station 20.

On the other hand, when the number of base stations decreases, for example, when the base station 11 is deleted from the radio telemeter system 10, before the deletion, the base station that has received a signal from the center device 21 that triggers the reduction processing is received. Bureau 11
A procedure for directing the directional antenna 16A of the terminal 16 toward the base station 12 and then deleting the base station 11 is performed.

Similarly, when the position of the base station 11 is to be changed, before the change, the antennas of the terminals 15 and 16 are transmitted by radio transmission from the base station 11 which has received a trigger designating the change processing from the center device 21. The directions of 15A and 16A may be directed to the position of the change destination, and then the position of the base station 11 may be changed.

In the normal operation of the wireless telemeter system 10, the metering information of the water meter collected by each of the base stations 11, 12 (, 20) from each of the terminals 15 to 18 is transmitted to the center device 21 and accumulated. Will be processed.

(A-3) Effects of the Embodiment According to the present embodiment, the operation of changing the direction of the antenna of each terminal can be automated, and does not require any manual operation unlike the related art.

Therefore, the operation of the wireless telemeter system can be performed smoothly, flexibly, and inexpensively, and the cost for maintaining and expanding the system can be greatly reduced.

(B) Other Embodiments As in the above embodiment, instead of an antenna that controls the direction of a radiation pattern by a motor, an antenna that electrically controls the direction of a radiation pattern, such as a phased array antenna, is used. May be used.

In this case, since the control of the direction of the antenna is performed by changing the phase of the radio wave, the same operation as in the above embodiment is performed except that the motor 37 and the control line 36 are not required. The same effect can be obtained.

The antenna control command A of the above embodiment
In I, the absolute values of the coordinates of X and Y are used as data, but this is used as difference data from the current antenna direction data (stored on the base station side) to reduce the load on the terminal. Can also.

In this case, the base station holds and manages information on the position of the terminal, the position of the base station to which the directional antenna of the terminal is currently pointing, and the position of the base station to which the terminal is newly pointing. In addition, the base station also performs an operation to determine in which direction the antenna of the terminal needs to rotate and how many times based on this information.

In this case, when the first terminal is installed, the control unit 31 of each terminal may store the antenna direction (radiation pattern direction) at that time.

Further, regarding the data structure of the antenna control command AI, the command type section IT is not always necessary, and the terminal can be surely added with a new antenna by adding it to a predetermined position of control data transmitted on the downlink channel. A structure that can identify the information for designating the direction is sufficient.

In the above description, control data is transmitted on the downlink channel from the base station to the terminal, and meter measurement information is transmitted on the uplink channel from the terminal to the base station. Information other than control data may be transmitted, or information other than measurement information may be transmitted on an uplink channel.

Further, in the above embodiment, the direction of the radiation pattern is changed only in the horizontal plane, but may be changed in the vertical plane. That is, it may be performed in the vertical plane alone, or may be performed in both the horizontal plane and the vertical plane.

The number of base stations can be increased, decreased, or changed not only by increasing or decreasing the number of base stations as described in the above embodiment, or by changing the geographical position of the base stations. This also includes a change in system operating conditions such as a change in transmission power of the system and a change in frequency band used.

In the above description, the process for determining the direction of the antenna of each terminal is performed by each base station and each terminal autonomously. This processing may be performed centrally for the entire 10.

In this case, each base station and each terminal do not need to hold and manage information on the position of the terminal, the position of the base station to which the directional antenna of the terminal is currently pointing, and the like. Since each base station or terminal does not need to perform the calculation for determining in which direction the antenna of the corresponding terminal needs to rotate based on the information, the size of the base station or terminal can be reduced, and the load can be reduced. Can be lightened.

In the above embodiment, the number of base stations increases and decreases,
Although the center device 21 gives a trigger for the increase process, the decrease process, and the change process corresponding to the change, the center device 21 may be used as a base station to be a new pointing target (the base station 20 in the above example of the increase process). Alternatively, the base station (the base station 11 in the example of the above-described increase processing) that has been the pointing target may be used.

In this case, the external device ED2 to which the external interface unit 40 is connected by wire is another base station such as the base station 12, and the center device 21.

In the above description, the external interface unit 3
The connections between the external devices ED1 and ED2 are wired, but may be wireless if necessary.

Further, in the above description, a wireless telemeter system has been described. However, the communication system of the present invention is a wireless telemeter system in which one or a plurality of terminal devices are wirelessly connected to one base station or control station. Application to a fixed station wireless system other than the system is also possible. For example, there is a case where a home security system installed in each user's home is wirelessly connected to one base station.

For the present invention, the frequency band of 2.4 to 2.5 GHz, the CDMA system,
Naturally, two-way communication is not an essential requirement.

The term “radiation pattern” used in the claims does not mean that the directional antenna is a transmitting antenna. That is, in the claims, the directional antenna included in the wireless fixed terminal,
An antenna used for both transmission and reception, an antenna dedicated to transmission, or an antenna dedicated to reception may be used.

That is, the present invention can be widely applied to a radio fixed terminal, a radio base station, and a communication system when a radio fixed terminal having a directional antenna and a radio base station communicate using the directional antenna. it can.

[0097]

As described above, according to the communication system of the present invention,
The radio base station and the fixed radio terminal have high communication quality and high system capacity, but are easy and efficient to control. It is possible to automatically change the direction of the radiation pattern of the directional antenna of the wireless fixed terminal.

Accordingly, the direction of the radiation pattern of the directional antenna can be changed immediately and almost simultaneously with respect to a large number of fixed wireless terminals in response to an increase or decrease in the number of wireless base stations. The cost for maintenance and expansion of the system can be kept low.

In addition, the simplicity of control generally means that the radio base station,
This means that the device size of the wireless fixed terminal is small and the structure is simple, and this also contributes to cost reduction.

[Brief description of the drawings]

FIG. 1 is a block diagram illustrating a configuration of a terminal device according to an embodiment.

FIG. 2 is a block diagram illustrating a configuration of a base station according to the embodiment.

FIG. 3 is a schematic diagram illustrating a data configuration of an antenna control command according to the embodiment.

FIG. 4 is a schematic diagram showing an overall configuration of a wireless telemeter system according to the embodiment.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 10 ... Wireless telemeter system, 11, 12, 20 ... Base station, 11A, 12A, 15A-18A, 20A ... Antenna, 31, 41 ... Control part, 37 ... Motor, ED1, E
D2: external device, AI: antenna control command, XD: X-axis coordinate data part, YD: Y-axis coordinate data part.

Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI Theme coat II (reference) H04Q 7/26 7/30

Claims (5)

[Claims] 1. A fixed radio station comprising a directional antenna for wirelessly communicating with a radio base station, a radiation pattern changing means for changing a direction of a radiation pattern of the directional antenna, Designation signal detection means for detecting, from among the signals transmitted from the radio base stations, a radiation pattern direction designation signal serving as a basis for determining the direction of the radiation pattern of the directional antenna, A fixed radio terminal comprising: a radiation pattern direction control unit that determines a direction of the radiation pattern according to the content and controls the radiation pattern changing unit according to the determined direction of the radiation pattern. 2. The radio fixed terminal according to claim 1, wherein the radio fixed terminal includes a terminal side position recognizing means for recognizing terminal position information indicating a position of the own station. Is composed of target position information that specifies the position of the radio base station to which the direction of the radiation pattern is to be adjusted, and the radiation pattern direction control unit performs the radiation pattern direction from the terminal position information and the target position information. If the wireless fixed terminal does not have the terminal-side position recognition means, the wireless base station recognizes at least the terminal position information of each wireless fixed terminal and the target position information, The radiation pattern direction designation signal includes difference information between a current radiation pattern direction of each wireless fixed terminal and a new radiation pattern direction, and the radiation pattern direction control means , Wireless fixed terminal and determining the direction of the radiation pattern on the basis of the difference information. 3. A radio base station of a communication system accommodating a radio fixed terminal having a directional antenna, wherein a radiation pattern direction designation signal serving as a basis for determining a direction of a radiation pattern of the directional antenna is transmitted to the radio fixed station. A radio base station comprising a designation signal transmitting means for transmitting to a terminal. 4. The radio base station according to claim 3, wherein the radio base station includes at least base station side position recognizing means for recognizing a position of the own station, wherein the wireless fixed terminal indicates a position of the own station. When the terminal side position recognizing means for recognizing position information is provided, the radiation pattern direction designation signal includes target position information for specifying a position of a radio base station to which the direction of the radiation pattern is to be adjusted, If the wireless fixed terminal does not include the terminal-side position recognition means, the wireless base station, at least the terminal position information of each wireless fixed terminal, the position relationship management means for recognizing and managing the target position information, The radio base station, wherein the radiation pattern direction designation signal comprises difference information between a current radiation pattern direction of each wireless fixed terminal and a new radiation pattern direction. 5. A communication system comprising the wireless fixed terminal according to claim 1 or 2 and the wireless base station according to claim 3 or 4.