JP3479263B2 - Radio base station test apparatus and test method therefor - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a radio base station test apparatus and a test method therefor, and more particularly to a radio base station test having a plurality of sector antennas and radio transceivers respectively corresponding to a plurality of sectors of a mobile communication system. The present invention relates to a test device and a test method for the test device.

[0002]

2. Description of the Related Art A mobile communication system comprises a large number of radio base stations. A test machine (test transceiver or TTR) is used for the operation test of these base stations. In the TDMA (time division multiple access) method, interference does not occur between a plurality of base stations if different frequencies are used, but interference occurs in the CDMA (code division multiple access) method using the same frequency.

As shown in FIG. 7, a conventional test apparatus is mounted on a tester 103, a plurality of antennas (sector antennas) 101a to 101f respectively corresponding to a plurality of sector zones obtained by dividing a service area of a radio base station. A single (non-directional) tester antenna 102 is used. There are variations in the spatial coupling amount between the tester antenna 102 and the plurality of sector antennas 101a to 101f. For example, the spatial coupling amount between the sector antenna 101b and the tester antenna 102 is −30 dB, and the sector antenna 101e and the tester antenna 10 are connected.
The amount of spatial coupling with 2 is -50 dB. The downlink radio wave in which the control channel and the call channel are multiplexed is the sector antenna 101b and the sector antenna 101e.
Have been fired from each. If the outputs of the respective antenna ends are the same, the strength of the radio wave received by the transmitting / receiving unit 104 of the tester antenna 102 from the sector antenna 101b is 20 dB higher than the strength of the radio wave received by the tester antenna 102 from the sector antenna 101e. Is getting stronger. For this reason, the tester antenna 102 grasps the downlink radio wave emitted from the sector antenna 101b, and is in a state where the sector antenna 101b is within range.

[0004]

In the conventional test equipment,
In the above-described state, even if the host device instructs the downlink radio wave of the sector antenna 101e to be grabbed by the tester antenna 102, the downlink radio wave of the sector antenna 101b is largely interfered by the downlink radio wave of the sector antenna 101e. The sector antenna 101e acts as electric power and the downlink radio wave of the sector antenna 101e is masked by the downlink radio wave emitted from the sector antenna 101b.
The downward radio wave emitted from 01e is the antenna 10 for the tester.
2 (transmission / reception section 104) cannot perform decoding, and cannot be within the area of the sector antenna 101e. Sector antenna 10
During the test of 1e, the actual distance between the tester antenna 102 and the sector antenna 101e is 20
The host device that determines that the dB component is at a distant point requests the tester antenna 102 to have an electric field value that is higher by 20 dB than when the sector antenna 101b was being tested. For this reason, during communication with the tester antenna, the reception sensitivity of the sector antenna 101b (the transceiver thereof) that is suppressed by the interference of the input unnecessary radio wave is deteriorated.

Therefore, there is a demand for a method of performing a test for each sector (sector antenna) without interference from other sectors (sector antennas) in the CDMA system having the same frequency.

[0006]

A test apparatus according to the present invention has a plurality of sector antennas and radio transceivers respectively corresponding to a plurality of sectors to which the same radio frequency is assigned in a mobile communication system. In the test equipment for testing the radio base station , the area surrounded by the sector antennas
Main sector of each sector antenna is provided in the core area.
Back lobe in the central area, which is different from the
A plurality of beam antennas each having a directivity pattern corresponding to the included side lobe ; an antenna switching means for selecting any one beam antenna from the plurality of beam antennas; and a selection via the antenna switching means. Connected with beam antenna to send and receive test radio signals
The test radio transmission / reception means for receiving the signal , the antenna switching means and the radio transmission / reception means to control the beam antenna
Transmitting and receiving the test radio signal for each sector, and the sector antenna for each sector without receiving interference from other sectors and
And a control means for testing the wireless transceiver.

[0007]

[0008]

[0009]

A radio base station of a mobile communication system according to the present invention has the test apparatus having the above-mentioned configuration, and the main lobe is directed outward on a circle equidistant from the center position of the plurality of sector antennas. A plurality of beam antennas of the test apparatus are arranged at equal intervals, and the test radio waves are transmitted and received by using the back lobes of the sector antennas.

The test method of the present invention is a test method for testing a radio base station having a plurality of sector antennas and radio transceivers respectively corresponding to a plurality of sectors to which the same radio frequency is assigned in a mobile communication system. ,
Provided in the central area surrounded by the sector antennas
Each directional pattern of the multiple beam antennas
The center different from the main lobe of each sector antenna
It to the side lobe, including the back lobe facing into the area
Corresponding to each of the above, by the antenna switching means, each beam
Select any one of the beam antennas
And a test wireless transmission / reception means for transmitting / receiving a test wireless signal
And a control means for connecting the antenna switching means and
The beam antenna is controlled by controlling the test radio transmitting / receiving means.
The test wireless signal is sent and received for each
The sector antenna and sector for each sector without interference from
And the process of testing the radio transceiver .

[0012]

BEST MODE FOR CARRYING OUT THE INVENTION The present invention relates to a test apparatus for a code division multiple access type wireless base station for a mobile communication system (hereinafter referred to as a CDMA base station), which has a plurality of directivity patterns corresponding to the number of sectors. Equipped with a beam antenna and beam terminal switcher, each sector can be operated without interference from other sectors.
( EN) Provided are a test device and a test method capable of performing a test.

Next, embodiments of the present invention will be described in detail with reference to the drawings.

FIG. 1 is a block diagram showing an embodiment of the present invention, and FIG. 2 is a detailed view showing the antenna switching device thereof. 1 and 2, the tester 1 is a CDMA
A plurality of antennas (sector antennas) 5a, 5b, 5 respectively corresponding to a plurality of (six in this example) sector zones obtained by dividing a service area operated by a base station (not shown)
a plurality of radiating elements 41 corresponding to c, 5d, 5e and 5f
A plurality of beam antennas 4a, 4b, 4c including a, 41b, 41c, 41d, 41e, 41f, and a plurality of beam terminals 30a, 30b, 30c, 30d, 30e, 30f.
And a plurality of hybrid circuits (HYB) 31a, 31
Beam terminal switch 20 including b and 31c, control unit 11 that controls the whole, and transmission / reception unit 1 that transmits and receives radio signals.
It has 2 and.

The beam antenna 4a inputs a transmission wave to either of the two beam terminals 30a and 30b,
It is a two-beam antenna that can change the phase of the transmission wave and separately supply the two radiating elements 41a and 41b through the HYB 31a and the antenna connectors 32a and 32b, and can change the directivity pattern in two kinds of directions. It corresponds to 5a and 5b. The HYB 31a is a 4-terminal circuit, and one signal input to a certain input terminal is 2
It is separated into two signals, and the phase of one signal is advanced / retarded by 90 degrees and output to two output terminals respectively. On the contrary, the two signals input to the two output terminals are combined by advancing / retarding the phase of one signal by 90 degrees, and are output to the two input terminals.

Similarly, the beam antenna 4b is
At the beam terminals 30c and 30d via the YB 31b and the antenna connectors 32c and 32d, the sector antenna 5c,
5d, the beam antenna 4c includes a beam terminal 30 via the HYB 31c and antenna connectors 32e and 32f.
e and 30f correspond to the sector antennas 5e and 5f, respectively.

In this embodiment, the number of sectors (6
Although three two-beam antennas are used as the beam antenna corresponding to (1), the present invention is not limited to this, and six single-beam antennas can be used. In this case, it is not necessary to use HYB.

During the test of the sector antenna 5a and the transceiver connected thereto, the tester 1 sends a beam terminal switching signal SS having the information "beam terminal 30a selected" from the controller 11. The beam terminal switching device 20 inputs the beam terminal switching signal SS and connects it to the beam terminal 30a. At this time, in the beam antenna 4a, the directivity pattern formed by the radiating elements 41a and 41b in which the transmitted wave passes through the hybrid circuit corresponds only to the sector antenna 5a, and the transmitted wave output from the tester 1 is transmitted. Does not interfere with other sectors, it is possible to test the sector antenna 5a and the transceiver without causing deterioration in reception sensitivity due to interference with non-test sectors.

Next, the configuration of the present embodiment will be described in more detail.

Hereinafter, the beam antennas 4a to 4c or the general terminals are transmitted and transmitted, and the sector antennas 5a to 5c are transmitted.
The radio wave received by 5f is referred to as "uplink radio wave", and the radio wave emitted from the sector antennas 5a to 5f and transmitted and received by the beam antennas 4a to 4c or the general terminal is referred to as "downlink radio wave".

In the configuration of the CDMA base station test apparatus according to the present invention, an antenna group is provided together with a test mobile unit (hereinafter referred to as a test unit). As shown in FIG. 1, the tester 1 is equipped with an antenna group. The antenna group is
Each has a sharp directional pattern in two different directions 3
One beam antenna 4a-4c is provided. Each of the beam antennas 4a to 4c has a radiating element. The beam antenna 4a has radiating elements 41a and 41b, the beam antenna 4b has radiating elements 41c and 41d, and the beam antenna 4c has radiating elements 41e and 41f. Each of the beam antennas 4a to 4c is a transmission / reception shared antenna capable of transmitting and receiving.

The CDMA base station is provided with six sector antennas 5a to 5f and is connected to transceivers for transmitting and receiving CDMA radio signals corresponding to the respective sectors mounted in the CDMA base station. Each transceiver has appropriate spreading and despreading units inside to communicate with the CDMA mobile station. After that, for example, the sector antenna 5a
The test of the transmitter / receiver connected to is simply referred to as “test of the sector (5a)”.

As shown in FIG. 5, the system is designed so that each sector (sector zone) formed by the six sector antennas 5a to 5f is concentrically formed at equal angular intervals and equidistant from the concentric points. ing. The service area forms a circular area in which each sector zone is integrated. The sector antennas 5a to 5f are arranged at equal intervals on a circle equidistant from the center position, and the antenna group (beam antennas 4a to 4c) of the tester 1 is provided at the center position.

The tester 1 further includes a beam terminal switching device 20.
And a control unit 11 and a transmission / reception unit 12. The control unit 11 and the transmission / reception unit 12 are connected to the beam terminal switching device 20.

The control unit 11 is connected to the beam terminal switching unit 20 via the signal connector 21, and the beam terminal switching unit 20 is connected.
To the beam terminal switching signal SS.

The transmission / reception unit 12 has a proper spreading unit and despreading unit therein for communicating with the CDMA base station. The transmission / reception unit 12 is connected to the beam terminal switching unit 20 via the RF coaxial connector 23, and the beam terminal switching unit 2 is connected.
An up radio wave is output to 0, and a down radio wave is input from the beam terminal switch 20.

The beam terminal switching unit 20 has a beam terminal switching switch group inside. The beam terminal changeover switch group is, as shown in FIG. 2, a beam terminal changeover switch 25a, 25b, 25c, 25d, 25e, 25f.
Is equipped with. The transmitter / receiver 12 includes the beam terminals 30a to 30f based on the operations of the beam terminal switching switches 25a to 25f.
Only one arbitrary one of the beam antennas 4a to 4c is bidirectionally connected via the beam terminal switch 20 which selects only one arbitrary one of the antennas 30f.

The beam terminal switch 20 further includes an antenna connector group. The antenna connector group includes six antenna connectors 32a, 32b, 32c,
It has 32d, 32e, and 32f. The antenna connectors 32a to 32f correspond to the beam antennas 4a to 4c, respectively. Antenna connectors 32a, 32
b corresponds to the beam antenna 4a, and the antenna connector 3
2a is connected to the radiating element 41a to connect the antenna connector 32
b is connected to the radiating element 41b . Similarly, the antenna connectors 32c and 32d correspond to the beam antenna 4b, the antenna connector 32c is connected to the radiating element 41c, and the antenna connector 32d is connected to the radiating element 41d. The antenna connectors 32e and 32f correspond to the beam antenna 4c, and the antenna connector 32e is the radiating element 4
1e and the antenna connector 32f is connected to the radiating element 41.
It is connected to f.

For example, a commercially available SMA type connector is adopted for each terminal of the antenna connectors 32a to 32f, and its spatial isolation can be realized at -80 dB or less, and the influence of spatial interference between those terminals is eliminated. Has been done.

The antenna connectors 32a to 32f are further connected to the RF coaxial connector 23 described above in a switchable manner. Switch 2 for switching each beam terminal
5a to 25f and the RF coaxial connector 23 are connected to each other by strip lines 24 (shown by double-headed arrows in FIG. 2 respectively), and the lengths of the strip wavelengths of the in-tube wavelengths handled by the tester 1 are set as the respective lengths. Half the length is given. Further, the layout is such that the isolation between the strip lines 24 is about -80 dB or less. In the layout method, for example, each stripline 24 is arranged on a different layer of the multilayer printed board, or a shield case is provided between the striplines 24, whereby isolation of -80 dB or less can be realized.

Each beam terminal switching switch 25a-25
A selection circuit 22 composed of an IC (semiconductor integrated circuit) is inserted between f and the signal connector 21. The input terminal IN of the selection circuit 22 is connected to the signal connector 21, and the output terminals OUT15a to 15f of the selection circuit 22 are
The beam terminal switching switches 25a to 25f are connected correspondingly. The selection circuit 22 is based on the selection information of the beam terminal switching signal SS input from the signal connector 21, and switches 25a to 25 for beam terminal switching.
Connect any one of f. The strip lines 24 of the other antenna switching switches that are not selected are opened.

The impedance Z of the stripline 24 in the open state is expressed by the following general formula: Z = Zo / jta
It can be calculated by n (2πL / λg). Where Zo: characteristic impedance of stripline, L: electrical length, λ
g: Wavelength in the tube.

As described above, since the length of each strip line 24 is 1/2 of the guide wavelength of the frequency handled by the tester 1, the impedance of the strip line 24 in the open state is an infinite value according to the above equation. Becomes That is, the other strip lines 24 that are not selected are open in a high frequency and are equivalent to the unconnected state, and can be ignored. Therefore, there is no effect due to impedance fluctuation or the like.

Each beam antenna 4a-4c has its output adjusted when the tester 1 is installed so that the received electric field values received by the corresponding sector antennas 5a-5f of the base station are uniform. There is.

First, the beam terminal 30a is selected by the beam terminal switching signal SS to select the beam terminal switching switch 25a.
, The beam antenna 4a emits in the direction of the sector antenna 5a, and the received electric field value received by the sector antenna 5a of the base station is a reference value (for example, about −40 dBm ± 5d).
The position of the beam antenna 4a is adjusted so as to be in B), and the reception electric field value received by the other sector antennas 5b to 5f becomes a predetermined electric field value (for example, -100 dBm or less) that does not cause deterioration in reception sensitivity. It is confirmed that

Next, the output value of the tester 1 is kept constant and the beam terminal 30 is turned on by the beam terminal switching signal SS.
Select b and connect the switch 25b for changing the beam terminal, the beam antenna 4a emits in the direction of the sector antenna 5b, and the received electric field value received by the sector antenna 5b becomes the above reference value (about -40 dBm ± 5 dB). The beam antenna 3a is adjusted so that the reception electric field values received by the other sector antennas 5a and 5c to 5f are the predetermined electric field value (-100 dBm) that does not cause the deterioration of the reception sensitivity.
The following is confirmed. Such adjustment is performed on the other remaining beam antennas 4b and 4c.

As described above, the beam antenna 4a can emit the transmitted wave as a beam having two kinds of directivity patterns by switching the beam terminals 30a and 30b.
The tester 1 is directionally installed so that the electric field value of the up radio wave input to the sector antennas 5a and 5b is the maximum.

In terms of processing and characteristics of the antenna body, according to "Illustrated mobile communication antenna system / Kyohei Fujimoto supervision / general electronic publisher", a two-beam antenna is shown in FIG.
0 (page 148), the two beam terminals A and B have two radiating elements # via a hybrid circuit.
Connect to # 1 and # 2. An external view of the configuration of such a two-beam antenna is shown in FIG.

The radiating elements # 1 and # 2 are arranged in a wavelength (hereinafter, λ) corresponding to the used frequency as shown in FIG.
Is applied to each formula to calculate. For example, if the operating frequency is about 2 GHz, λ is equal to about 15 cm, and the distance S from the center line (assumed to be the Z axis) of the reflector to be fixed in the Y axis direction is S = 4.8 cm.
The height gap H of the radiating elements # 1 and # 2 is 7.5 cm, the width W of the reflecting plate is 10.2 cm, the depth T of the side plate is 1.2 cm, and X from the reflecting plate to the radiating element. An axial distance D = 2.1 cm can be calculated for each. The radiating elements # 1 and # 2 are fixed to the reflecting plate based on the dimensions thus obtained. The two-beam antenna can emit a beam having two kinds of directivity patterns by inputting a transmission wave to any of the beam terminals A and B. When the transmitted wave is input to the beam terminal A, it is deflected to the right by 30 degrees from the front (X-axis) direction of the reflector, and when the transmitted wave is input to the beam terminal B, it is left 30 from the front (X-axis) of the reflector. A beam deflected in the direction of degree is obtained. Also, the side lobes that cause interference between the beams are reduced because the side plates are provided.

FIG. 3 shows directivity patterns of the sector antenna and the beam antenna. Sector antenna 5a
The beam angle of the main lobe 51 is designed to be approximately 60 degrees. Therefore, the interference due to the downlink radio wave of the sector antenna 5a does not affect the sector antennas 5b to 5f. Sector antenna 5a
Has a sub-lobe (side lobe and back lobe, hereinafter referred to as side lobe) 52 having a small pattern size in the opposite direction (direction toward the center point) opposite to the direction of the main lobe 51. Such side lobes 52 are used for communication with the beam antenna 4a.

On the other hand, the beam antenna 4a is connected to the beam terminal 3
The main lobe 43 when 0a is connected has directivity in the direction of 30 degrees to the right of the front direction and corresponds to the sector antenna 5a, and the sector antenna 5b is in the null point (insensitive) direction. The interference due to the side lobe (downstream radio wave) of 5b does not affect.

Next, the operation of this embodiment will be described in more detail.

Six sector antennas 5a to 5f corresponding to each sector zone of the radio service area of the CDMA base station
Uses the same frequency operationally determined by the connected transceiver, and performs code division multiple access between it and the general terminal.

In the CDMA base station test apparatus according to the present invention, by selectively connecting any one beam terminal, the transmission / reception relationship between any one test sector antenna of the base station and the beam antenna corresponding to that position is particularly improved. It can be tested in a one-to-one correspondence, and a test that avoids uplink and downlink interference with other non-test sector antennas is possible. Due to the directional relationship between a sector antenna and a beam antenna, the side lobes of that sector antenna are used.

The tester 1 sequentially and periodically tests whether the CDMA base station is operating normally, with respect to the sector antennas 5a to 5f and their transceivers.

First, the operation of testing the sector antenna 5a and its transceiver (test of sector (5a)) will be described.

The control section 11 outputs a beam terminal switching signal SS for selecting the beam terminal 30a. The beam terminal switch 20 connects the beam antenna 4a as an operating antenna. The beam emitted from the beam antenna 4a is
The direction is 30 degrees to the right of the front direction of the beam antenna 4a (direction of the sector antenna 5a). That is, as shown in FIG. 3, the downlink radio wave of the sector antenna 5a is coupled to the tester 1 via the beam antenna 4a, and the tester 1
The upstream radio wave of is coupled to the sector antenna 5a, so that the communication between the beam antenna 4a and the sector antenna 5a becomes possible. The test content is generally a practical operation test of a CDMA base station performed by a host device controlling the tester 1, and by using any one channel among a plurality of owned channels of each sector as a test channel, The normal operation of the sector (5a) can be confirmed.

Next, the operation of testing the sector antenna 5b and its transceiver (test of sector (5b)) will be described. The control unit 11 outputs a beam terminal switching signal SS that selects the beam terminal 30b. Beam terminal switch 2
0 connects the beam antenna 4a as an operating antenna. The beam emitted from the beam antenna 4a is in the direction of 30 degrees to the left of the front direction of the beam antenna 4a (direction of the sector antenna 5b). That is, as shown in FIG.
By being coupled to the tester 1 via a and the upstream radio wave of the tester 1 being coupled to the sector antenna 5b,
Communication between the beam antenna 4a and the sector antenna 5b becomes possible. In this way, the tests are sequentially performed on the sectors (5a) to (5f).

Looking at the situation of the down radio wave and the up radio wave, for example, it is assumed that the outputs from the respective antenna ends are emitted from the sector antenna 5b and the sector antenna 5e, respectively. When the beam terminal 30b is connected to the tester 1, the beam antenna 4a captures the downlink radio wave only from the sector antenna 5b, so that the tester 1 can be placed in the sector (5b).

On the other hand, when the tester 1 selects the beam terminal 30e, the beam antenna 4c captures the downlink radio wave only from the sector antenna 5e, so that the sector (5e) can be placed in the area. As a result, the tester 1 can be coupled with the downlink radio wave of any sector antenna.

Further, in the tester 1, since the beam antenna 4a emits only in the direction of the sector antenna 5b when the beam terminal 30b is connected, only the sector antenna 5b can grab and couple the upstream radio wave of the tester 1. . On the other hand, when the tester 1 is connected to the beam terminal 30e, the beam antenna 4c emits only in the direction of the sector antenna 5e, so only the sector antenna 5e can grab and couple the upstream radio wave of the tester 1. In this way, the tester 1 and each sector ((5a) to (5f)) can perform one-to-one communication with each other, and the sectors other than the ones in communication do not receive suppression because of interference. Sensitivity does not deteriorate.

The test cycle is carried out, for example, every other day by designating the time in the midnight zone when the traffic (call) volume is relatively small. In addition, the designation of the test sector and the test start time,
The test cycle can be freely set on the host device side of the CDMA base station.

Next, another embodiment will be described.

As another embodiment of the present invention, referring to FIG. 4, the beam terminal changeover switches 25a to 25a of FIG.
25f and these beam terminal switching switches 25a-2
A coaxial relay 26 is used in place of the 1/2 guide wavelength stripline 24 between the 5f and the RF coaxial connector 23.

In the coaxial relay, a reed switch is inserted in a copper tube around which a coil is wound, and the core wire of each coaxial cable (including the coaxial connector) and the reed switch contacts (contact points) to be connected and disconnected. The shield wire and the copper tube are connected to each other, the drive current of the coil is controlled to control the magnetic field applied to the reed switch, and the contact is opened and closed. The reed switch is a switch in which a pair of ferromagnet-made reeds are used as contacts and are opposed to each other with a minute gap, and are enclosed together with an inert gas in a glass tube. Since the entire switch is covered with a copper tube, the coaxial cable's shielding property and impedance matching property are maintained. A plurality (six) for one coaxial connector 23 as in the present invention
When any one of the beam terminals 30a to 30f is selected and connected, the necessary number (6) of reed switches,
A set of copper tubes and coils and branching means for them are provided. Further, in order to drive the current to these coils, the output signal to each OUT terminal of the selection circuit 22 is used.

As such a coaxial relay 26, for example, "Position Latching (6-MP-28-LS) manufactured by K & L Microwave Incorporated is used.
MA-I-TTL) "and can be replaced with the strip line 24. In this case, the selection circuit 22 inputs the antenna switching signal SS, which is information of arbitrary sector antenna selection, and is connected to OUT.
If a TTL level signal is output to the terminal, it is possible to switch to any sector antenna. Moreover,
If the coaxial relay can input the serial logic signal, the beam terminal switching signal output from the external control unit 11 can be directly connected to correspond to the beam terminal switching unit 20 to the selection circuit 22. Can also be omitted.

[0057]

According to the present invention, since beam antennas corresponding to a plurality of sectors (sector antennas) are switched and used, a CDM operating the same frequency in a plurality of sectors.
With respect to the A base station and its test method, each sector can be tested individually without avoiding interference from other sectors and without interrupting the operation of other sectors.

[Brief description of drawings]

FIG. 1 is a block configuration diagram showing an embodiment of the present invention.

FIG. 2 is a block diagram showing a configuration example of a beam terminal switching device in FIG.

FIG. 3 is a plan view showing an example of a directivity pattern of a sector antenna.

FIG. 4 is a block diagram showing another embodiment of the present invention.

FIG. 5 is a schematic diagram showing a service area of a CDMA base station.

FIG. 6 is an external view showing a configuration example of a two-beam antenna.

FIG. 7 is a block configuration diagram showing a conventional radio base station test apparatus.

[Explanation of Codes] 1 Tester 4a to 4c Beam antennas 5a to 5f Sector antenna 11 Controller 12 Transmitter / receiver 20 Beam terminal switching device 22 Selection circuit 23 RF coaxial connector 24 Strip lines 25a to 25f Beam terminal switching switch 26 Coaxial relay 30a to 30f Beam terminals 31a to 31c Hybrid circuit (HYB) 32a to 32f Antenna connectors 41a to 41f Radiating element 43 One main lobe of two beam antenna 51 Main lobe of sector antenna 52 Side lobe of sector antenna (back lobe)

─────────────────────────────────────────────────── --- Continuation of front page (56) References JP-A 61-70826 (JP, A) JP-A 7-46036 (JP, A) JP-A 10-308709 (JP, A) JP-A 10- 303617 (JP, A) JP 5-283923 (JP, A) JP 2001-231068 (JP, A) JP 6-37693 (JP, A) (58) Fields investigated (Int.Cl. ⁷⁾ , DB name) H04B 17/00 H04B 7/26 H01Q 3/00

Claims (3)

(57) [Claims] 1. The same radio frequency of a mobile communication system
In a test device for testing a radio base station having a plurality of sector antennas and radio transceivers respectively corresponding to a plurality of sectors to which is allocated , provided in a central area surrounded by the plurality of sector antennas.
Different from the main lobe of each sector antenna
Side row including back lobe pointing into the central region
Multiple beam antenna and any one of the antenna switching means for selecting the beam antenna, the selected via the antenna switching unit beam antenna of said plurality of beam antennas having directivity patterns corresponding respectively to Bed And a test wireless transmission / reception unit connected to and for transmitting / receiving a test wireless signal , controlling the antenna switching unit and the wireless transmission / reception unit.
Transmit and receive the test radio signal for each beam antenna.
And a control means for testing the sector antenna and the radio transceiver for each sector without receiving interference from other sectors. 2. The test device according to claim 1, comprising:
Several sector antennas on a circle equidistant from the center position.
Place the inlobes at equal intervals so that they face outward,
Install multiple beam antennas of the test equipment at the center position.
Test using the back lobe of each sector antenna.
Mobile communication system characterized by transmitting and receiving test radio waves
Stem wireless base station . 3. The same radio frequency of a mobile communication system
Multiple corresponding to multiple sectors assigned to
Base station having a sector antenna and a wireless transceiver
In the test method for performing the test of 1., it is provided in the central area surrounded by the plurality of sector antennas.
Each directional pattern of the multiple beam antennas
The center different from the main lobe of each sector antenna
It to the side lobe, including the back lobe facing into the area
Corresponding to each of the beam antennas by the antenna switching means
Select any one beam antenna of
Connected to the test wireless transmission / reception means for transmitting / receiving the signal, the control means causes the antenna switching means and the test
Control the wireless transmission / reception means for each beam antenna
Transmit and receive test radio signals to prevent interference from other sectors.
Sector antenna and wireless transmission / reception for each sector without receiving
A test method characterized by performing a test of a receiver .