JPH09247063A - Digital high speed radio communication equipment - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent effect of a reflecting wave from surrounding onto waveform distortion and to relieve deterioration in shadowing by selecting a path used for communication of a succeeding frame among path used for paths of lots of directivity antennas and object paths of destinations. SOLUTION: A mobile station 41 a sector antenna 51 consisting of 6 directivity antenna and a base station 42 has sector antennas 61-64 each consisting of 6 directivity antennas. Furthermore, one sector antenna having plural directivity antennas is provided to the mobile station 41 and four sector antennas each having plural directivity antennas is provided to the base station 42, one transmission antenna is selected from the directivity antenna among the directivity antennas of the mobile station 41, one transmission antenna is selected from the directivity antenna among the directivity antennas of the base station 42 and four reception antennas are selected from the directivity antennas among the directivity antennas of the base station 42. A radio wave incident to any sector by a sector changeover switch is selected among radio waves incident to each directivity antenna of the sector antenna 51 and a receiver receives a signal.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a digital high-speed wireless communication device using antenna diversity which improves transmission quality by using a sector antenna composed of a plurality of directional antennas. In particular, it is possible to remedy the deterioration due to ground reflection and the deterioration due to shadowing, and it is not necessary to use a dedicated burst for measuring the quality of the communication path during communication. The present invention relates to a communication device.

[0002]

2. Description of the Related Art Conventionally, many types of diversity have been put into practical use, which are composed of two or three directional antennas. When the number of directional antennas is thus small, it was easy to successively measure the quality of all directional antennas and switch or combine the input signals from the directional antennas.

However, in order to ensure stable communication quality even in a propagation path where multiple reflections are likely to occur,
It is effective to use a directional antenna with a narrow beam, and it is inevitable to use a sector antenna equipped with many directional antennas in order to widen the coverage in the arrival direction of radio waves. In addition, in order to ensure stable communication quality even in a propagation path where shadowing is likely to occur when people or vehicles block the communication path, or where height patterns are generated due to reflected waves from the ground or ceiling. It is effective to prepare multiple propagation paths with low spatial correlation for quality deterioration due to shadowing and height patterns. When transmitting and receiving between two terminals, at least one of them should be spatially spaced. It becomes necessary to provide a plurality of sector antennas, and it becomes necessary to provide more and more directional antennas.

For example, "High Bit Rate Communication System for Overcoming Multipath" (Japanese Patent Laid-Open No. 02-79628).
No.), as shown in FIGS. 2 and 3, for the antenna selection algorithm between the node 120 and the radiotelephone 110 each using 6 directional antennas shown in FIG. Disclosed is a method of measuring quality for 36 combinations and switching to the best combination of sectors when a route change is required in block 455.

[0005]

However, in this conventional method, the frame is always received and the learning is performed while changing the combination of the directional antennas, and the control is always performed so as to obtain the combination of the sectors of good quality. But
Even if the communication quality deteriorates due to the combination, learning of at least the next 6 frames must be completed in order to judge the necessity of changing the route, and there is a disadvantage that switching is delayed.

Further, in order to select the communication path by the combination of the directional antennas at the two terminals, it is necessary to constantly transmit a dedicated test burst for the purpose of measuring the quality of the communication path at regular time intervals. However, there are drawbacks such as reduced transmission efficiency.

Furthermore, since the communication path can be combined with the directional antennas of the two terminals, it is necessary to contact the two terminals in advance when switching, and it takes time to switch or switching is required. At that time, there is a drawback that the transmission quality is deteriorated and it may not be possible to make a contact and switching may not be possible.

Further, in this system, as shown in FIG. 1, even if the quality of the direct wave between the antennas is deteriorated by shadowing or height pattern, the reflected wave can be used for communication. Stable communication quality should be ensured in a radio environment where reflected waves cannot be expected to have sufficient communication quality unless they are surrounded by metal walls, and shadowing and height patterns frequently occur. There was a drawback that it became difficult.

On the other hand, there is transmission diversity as a conventional technique. (Example: Japanese Patent Laid-Open No. 05-252088) This is a TDD (Time Division Duplex) communication between two terminals so that communication quality in the vertical direction is equivalent, and communication is performed by one antenna at the first terminal. The second terminal communicates with a plurality of antennas. When the signal transmitted from the first terminal is received by the second terminal, the quality of the communication path by the plurality of antennas of the second terminal is compared by some means, and the antenna of the second terminal is selected. It is a thing.

According to this method, it is not necessary to constantly transmit the dedicated test burst for the purpose of measuring the quality of the communication path, and the control can be performed only within the second terminal, so that the switching time is also reduced. It is short and does not require contact between the two terminals. However, this method is generally effective when the antenna is an omni-antenna. That is, in this method, the first terminal has only one antenna, and it is necessary to use an antenna having a small directivity, such as an omni-antenna, in order to widen the coverage area in the arrival direction of radio waves. Therefore, a lot of reflected waves from the surroundings are input to the antenna, and the influence of the spectrum waveform distortion is large, and there is a drawback that it cannot be applied to broadband communication.

The second terminal has a plurality of directional antennas, and mainly two antennas are realized. As described above, as the number of directional antennas increases, all the antennas are used. There is a drawback that comparing the quality of communication paths is very difficult in realizing the device.

An object of the present invention is to provide a digital high-speed wireless communication device which solves the above-mentioned drawbacks when performing diversity transmission / reception between sector antennas.

[0013]

According to the present invention, among a large number of directional antennas, a path based on a combination of sectors used for communication and a plurality of paths that are candidates for switching destinations are selected at startup. The most main feature is to select a route used for communication of the next frame from a route used for communication and a route which is a candidate for switching. This is different from the conventional technique in that a plurality of paths with low spatial correlation are prepared in a radio wave environment where shadowing and height patterns frequently occur, and that the receiving antenna is a directional antenna in transmission diversity.

Therefore, the present invention can solve the above-mentioned problems, and can detect the transmission quality of a plurality of paths at the same time, thereby enabling high-speed and reliable switching, reducing quality deterioration, and preventing interference of reflected waves. A digital high-speed wireless communication device capable of being provided can be provided.

[0015]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 4 shows an antenna configuration example of the digital high-speed wireless communication device according to the first embodiment of the present invention. In the figure, the mobile station has a sector antenna 51 including six directional antennas, and the base station 42 has sector antennas 61 to 64 including six directional antennas. The four sector antennas of the base station 42 are arranged two in the horizontal direction and two in the vertical direction. The two horizontal antennas are arranged so that the line of sight with the mobile station 41 is not blocked by the moving object at the same time. In addition, the two units in the vertical direction are arranged at half pitch intervals of the height pattern.

FIG. 5 shows the configuration of the mobile station 41 shown in FIG. In the figure, among the radio waves incident on each of the directional antennas 51a to 51f of the sector antenna 51, the radio wave incident on one of the sectors is selected by the sector changeover switch 52, and the receiver 55 is switched by the transmission / reception switching of the TDM switch 53. So that the signal is received by. The reception level of the radio wave is measured by the detector 56,
As a result, the control unit 57 causes the sector changeover switch 5
Reflected in sector switching by 2. Next, the signal transmitted from the transmitter 54 reaches the sector changeover switch 52 by the transmission / reception changeover of the TDM switch 53, and the directional antenna 51a by the sector changeover by the sector changeover switch 52.
The signal is transmitted as a radio wave from any one of ~ 51f.

FIG. 6 shows the configuration of the base station 42 shown in FIG. In the figure, four sector antennas 611,
The signals simultaneously received by the 621, 631, and 641 are sector changeover switches 612, 622, and 63, respectively.
2, 642, the signals incident from one directional antenna for each sector antenna are received by the receivers 615, 62.
5,635,645 are reached. The communication quality of the signal received by each sector antenna is detected by the detectors 616 and 616, respectively.
626, 636, 646, and based on the results, the control unit 607 controls the transmission changeover switch 608, the reception changeover switch 609, and the sector changeover switch 612.
622, 632 and 642 are controlled. The signal transmitted from the transmitter 604 is transmitted from one sector of the omnidirectional antennas of the base station 42 by switching the transmission changeover switch 608 and the sector changeover switches 612, 622, 632, 642.

As described above, in the example shown in the present embodiment, the mobile station 41 has one sector antenna having a plurality of directional antennas and the base station 42 has one sector antenna.
, There are four, one from the directional antenna of the mobile station 41 for transmission and one for reception.
One of the directional antennas of the base station 42 is used for transmission, and four are used for reception.

FIG. 7 (a) is a diagram showing how the base station transmits a broadcast signal to the mobile station in the first embodiment of the present invention, and FIG. 7 (b) shows the transmission of the broadcast signal. It is a figure which shows dimming. Before the communication between the mobile station 71 and the base station 72 is started, the base station 72 sends a notification signal from each of the directional antennas of the sector antennas 711 and 721 shown in FIG. It is sent out at regular time intervals in the order shown.

At this time, the reason why the broadcast signal is not transmitted from all the sector antennas of the base station 72 is to save the start-up time, and the broadcast signals are transmitted to the sector antennas 711 and 721. The two antennas are vertically arranged at a half pitch interval, and even if one of the two antennas receives the interference of the ground reflected wave significantly when transmitting and receiving with the mobile station 71, the other antenna is This is because it is considered that the interference of the ground reflected wave is not significantly received. On the other hand, the sector antennas 711 and 731 or the sector antennas 721 and 741 are arranged in the horizontal direction as a countermeasure against shadowing, and the shadowing is completed in a short time even when the notification signal cannot be received due to the shadowing. Therefore, it is considered that the method of not transmitting the broadcast signal from the sector antennas 731 and 741 is effective for saving the start-up time.

FIG. 8 (a) is a diagram showing how the directional antenna of the mobile station receives the broadcast signal in the first embodiment of the present invention, and FIG. 8 (b) shows the broadcast signal. It is a figure which shows transmission / reception timing. The mobile station 81 receives the notification signal at each directional antenna of the sector antenna 81 shown in FIG. 8A at regular time intervals in the order shown in FIG. 8B as an example. From the quality of the received notification signal, the mobile station 81 selects the directional antenna, for example, 811f included in the base station 82 that has transmitted the notification signal and the 81 directional antenna, for example, 81rc, that has received the notification signal. Then, the response signal is transmitted at the timing when 811f receives it. Here, various means can be considered for measuring the quality of the received broadcast signal. The first example is a method of measuring the reception level. That is, it is a method of detecting the received notification signal reception level by the detector 56 and selecting the one having the highest level detected. As a second example, there is a method of supplementing the received signal, detecting the number of error bits in the demodulated signal, and selecting the one with the least error. There is also a method of using a result obtained by combining the results of both the error bit number and the reception level with a certain function. On the other hand, in the above-mentioned examples, the results were evaluated in all cases, but if there is something that meets the quality standard that is in the process of evaluation, there is also a method of ending the selection at that point without performing the subsequent evaluation. .

The notification signal is different in frequency from the signal used in normal communication. In digital high-speed wireless communication to which the present invention is applied, the frequency of the base station is indefinite because the mobile station and the base station are targeted at wireless stations that are unspecified. Therefore, in order for the mobile station to quickly capture the broadcast signal of the base station, the broadcast signal needs to have a uniform frequency in the digital high-speed wireless communication. Therefore, since the notification signal and the signal used in normal communication must have different frequencies, in order to evaluate the transmission quality of each communication path both at startup and during normal communication, the notification signal and the signal used in normal communication are used. In both cases, it is necessary to include a burst for quality measurement, and there is a drawback that transmission efficiency becomes low. Therefore, in the present invention, the signals used during normal communication include
Use a method that does not include bursts for quality measurement.

FIG. 9 is a diagram showing an example of selection of diversity candidate antennas according to the first embodiment of the present invention. When the directional antenna 91rc of the mobile station 91 and the directional antenna 911f of the base station 92 are selected as communication antennas, there are six sector antennas in each sector antenna 921, 931 and 941 of the base station 92 in FIG. Of the directional antennas of
921f and 931f in the same direction as 1f on the horizontal plane
And 941f are diversity candidate antennas.

Particularly, in this example, since the sector antennas 911 and 921 are arranged in the vertical direction, when 911f is selected for the mobile station 91, the sector antenna 92 is selected.
Among the directional antennas of the mobile station 9 of FIG.
It means that we are aiming for 1. However, since the sector antennas 911 and 921 are arranged at a half pitch interval here, even if the reception quality of 911f is good, 92
Since the reception quality of 1f is not always good, the method according to the present invention for selecting the antenna 921f at the position corresponding to the selected 911f as the diversity candidate antenna is effective.

FIG. 10 is a diagram showing another example of selection of diversity candidate antennas of the base station in the first embodiment of the present invention. Directional antenna 101 of base station 102
When 1f is selected, the sector antennas 1031 and 1
Of the directional antennas of 041, the directional antennas corresponding to 1011f are 1031f and 1041f which are in the same direction as 1011f on the horizontal plane. However, as can be seen in the figure, the sector antennas 1031 and 1041
Is at a position horizontally separated from the sector antenna 1011 by a certain distance, and therefore 1031f and 1041f are not necessarily most oriented to the mobile station 101. One of the sector antennas 1031 and 104 of the base station 102
1. Directional antennas 1031f and 1041f corresponding to the directional antenna 1011f selected in 1 and 1031a, 1031e and 1041 arranged in the vicinity thereof.
a, 1041e, the directional antenna that sequentially receives the synchronization bursts transmitted from the mobile station 101, detects the reception quality of the synchronization bursts, and receives the highest quality signal;
For example, let 1031a be a diversity candidate antenna in the sector antenna 1031. The sector antenna 10
Among 41, the method of selecting 1041a corresponding to 1031a using the fourth embodiment is effective.

FIG. 11 is a diagram showing selection of diversity candidate antennas and communication antennas in the first embodiment of the present invention. Directional antenna 1111 of the base station 112 selected as a diversity candidate antenna
11 out of f, 1121f, 1131, and 1141a
It is assumed that 11f is used as an antenna for communication with the mobile station 111 as shown in FIG. The signal transmitted from the directional antenna selected in the mobile station 111, for example, 111c is received by the directional antenna 1111f in the base station 112, and the detector 616 measures the transmission quality of the signal, for example, the bit error rate. To be done.
1 which is another diversity candidate antenna of the base station 112
In 121f, 1131a, 1141a, the carrier wave of the signal is received, and the detectors 626, 636, 64 are received.
At 6, the reception level of the carrier is detected.

When the bit error rate measured by the detector 616 is deteriorated below a certain threshold, the base station 1
Twelve other diversity candidate antennas, 1121
Among the f, 1131a and 1141a, the directional antenna having the highest detected reception level, for example, 1131a is used as the next communication antenna, and when transmitting to the mobile station 111 next time and receiving a signal from the mobile station 111. When this is done, the selected 1131a is used. In this example, the quality of the four directional antennas arranged in the vertical and horizontal directions is constantly evaluated at the same time. Therefore, when the received signal from the communication antenna 1111f deteriorates, the cause of the deterioration may be shadowing. For example, 11 arranged horizontally
The deterioration can be relieved by switching to 31a. Further, if the height pattern is changed due to ground reflection or the like, the deterioration can be relieved by switching to 1121f arranged in the vertical direction.

FIG. 12A shows reception of a signal transmitted from a base station to a mobile station by a selected directional antenna and an example of the signal of two adjacent antennas on both sides in the first embodiment of the present invention. FIG. 12 (b) is a diagram showing the transmission / reception timing of the signal. As shown in FIG. 12 (a), the signal transmitted from the base station 122 is one directional antenna selected by the mobile station 121, for example, 1
When received at 21 rc, two signals each having a certain number of bits in a part of the signal transmitted from the base station 122 are 12 at the timing shown in FIG.
The signals are received by the directional antennas 121rb and 121rd on both sides of 1c, and the reception level of each signal is detected by the detector 55. The transmission quality of the signal received at 121 rc, for example, the bit error rate, is measured by the detector 55, and if the measured bit error rate is lower than a certain threshold, 121 rb, 121
In rd, the directional antenna with the highest detected reception level, for example, 121rd, is used as the next communication antenna, and when transmitting to the base station 122 next time and when receiving a signal from the base station 122, Use the selected 121rd.

FIG. 13 is a flow chart showing the branch switching algorithm of the first embodiment of the present invention.
In the figure, first, after communication is started between the mobile station 41 and the base station 42, after sending and receiving a notification signal,
A directional antenna used for communication in the mobile station 41 (example: 51c above), a directional antenna used in communication for the base station 42 (example: 611f above), and a diversity candidate antenna (example: 621f, 631a, 6 above).
41a) is selected (S1301, S1302, S1)
303, S1304, S1305).

During normal communication, when the communication quality of the directional antenna used for communication in the base station 42 deteriorates below a certain threshold (S1306, S1307), 3
The directional antenna having the highest reception level is selected from the two diversity candidate antennas and used for communication with the mobile station 41 (S1308).

Also in the selected directional antenna,
When the communication quality deteriorates below a certain threshold (S130
9), selecting a directional antenna having a high reception level from the directional antennas (eg, 51b and 51d) on both sides of the directional antenna (eg, 51c) used for communication of the mobile station 41, This is used for communication with the base station 42 (S
1310).

When the directional antenna of the mobile station 41 is continuously switched a fixed number of times and the communication quality of the fixed threshold cannot be obtained, the mobile station 41 and the base station 4 are connected.
The communication with the second communication starts again from the transmission / reception of the notification signal (S1).
311).

FIG. 14 shows an antenna configuration example of a digital high-speed wireless communication device according to the second embodiment of the present invention. In the figure, it is assumed that transmission and reception are performed between the mobile station 141 and the base station 142 of FIG. The mobile station 141 has a sector antenna 151 composed of six directional antennas, and the base station 142 has sector antennas 161 and 162 composed of six directional antennas. The two sector antennas of the base station 142 have two vertical antennas.
The two antennas are arranged at half pitch intervals of the height pattern, and when transmitting and receiving with the mobile station 141, even if one of the two antennas receives significant interference of the ground reflected wave, the other antenna receives the ground signal. It is arranged so as not to be significantly affected by the interference of reflected waves.

FIG. 15 shows the configuration of the mobile station 141. Each directional antenna 1 of the sector antenna 151 is shown in FIG.
Among the radio waves that enter 51a to 151f, the radio waves that enter one of the sectors is selected by the sector changeover switch 152, and the signal is received by the receiver 155 by the transmission / reception switching of the TDM switch 153. The reception level of the radio wave is measured by the detector 156, and the result is reflected by the control unit 157 in the sector switching by 152 and the retransmission request signal transmitted from the transmitter 154. Next, the signal transmitted from the transmitter 154 reaches 152 by transmission / reception switching of 153, and is transmitted as a radio wave from any of the directional antennas 151a to 151f by sector switching by 152. When the transmission quality of the signal received by the receiver 155 is deteriorated below a certain threshold value, a retransmission request signal is output from the transmitter 154 and is transmitted as a radio wave from any of the directional antennas 151a to 151f. It

FIG. 16 shows the configuration of the base station 142. The signals simultaneously received by the two sector antennas 1611 and 1621 are directed by the sector changeover switches 1612 and 1622, one for each sector antenna. The signal incident from the antenna is the receiver 1
615, 1625 are reached. The communication quality of the signal received by each sector antenna is detected by the detector 1616,
Measured at 1626, and based on the result, the control unit 1
Reference numeral 607 denotes a transmitter 1604 and a transmission changeover switch 160.
8, control the reception changeover switch 1609 and the sector changeover switches 1612, 1622. The signal transmitted from the transmitter 1604 is set to 1 by switching the transmission changeover switch 1608 and the sector changeover switches 1612 and 1622.
It is transmitted from one sector of the omnidirectional antennas of 42. If the transmission quality of the signal selected by the reception changeover switch 1609 has deteriorated below a certain threshold, a retransmission request signal is output from the transmitter 1604, and the directional antennas 1611a to 1611f and 1612a to 161 are transmitted.
It is transmitted as a radio wave from any of 2f.

As described above, in the example shown in this embodiment, the mobile station 141 has one sector antenna having a plurality of directional antennas, and the base station 1 has one sector antenna.
42, there are two, one that is used for transmission from the directional antenna of the mobile station 141, one that is used for reception, and one that is used for transmission from the directional antenna that the base station 142 has. Select two to use.

FIG. 17 (a) is a diagram showing how the base station transmits a broadcast signal to the mobile station in the second embodiment of the present invention, and FIG. 17 (b) shows the mobile station broadcast. It is a figure which shows the transmission timing of a signal. Before the communication between the mobile station 171 and the base station 172 is started, the base station 172 transmits the notification signal to the sector antennas 1711 and 17 shown in FIG.
From each of the directional antennas 21 shown in FIG. 17B, for example, the signals are transmitted at a constant time interval. These two antennas are vertically arranged at half pitch intervals, and even if one of the two antennas receives interference from the ground reflected wave when transmitting / receiving to / from the 171, the other antenna is It is considered that the reflected waves of the earth are not significantly affected.
Even if the notification signal cannot be received due to the shadowing, the shadowing is completed in a short time. Therefore, it is considered that the transmission of the notification signal is sufficiently effective from the sector antennas 1711 and 1721.

FIG. 18A shows how the directional antennas of the mobile station according to the second embodiment of the present invention receive the broadcast signal, and FIG. 18B shows how the base station transmits to the mobile station. It is a figure which shows the transmission / reception timing of a notification signal. The mobile station 181 receives the notification signal at each directional antenna of the sector antenna 181r shown in FIG. 18A at regular time intervals in the order shown in FIG. 18B as an example.
The mobile station 181 determines from the quality of the received notification signal that
The directional antenna of the base station 182 that has transmitted the notification signal, for example, 1811f, and the directional antenna of the received 181r, for example, 181rc, are selected, and 181
The response signal is transmitted at the timing when 1f receives it. Here, various means for measuring the quality of the received broadcast signal can be considered, but they are as described in the first embodiment. The notification signal is also as described in the first embodiment.

FIG. 19 is a diagram showing selection of diversity candidate antennas of the base station in the second embodiment of the present invention. As shown in the figure, the directional antenna 191c of the mobile station 191 and the directional antenna 19 of the base station 192 are arranged.
When 11f is selected as the communication antenna, FIG.
Of the six directional antennas in the sector antenna 1921 of 192 in FIG. 9, which corresponds to 1911f,
Let 1921f which is in the same direction as f on the horizontal plane be a diversity candidate antenna.

In particular, in this example, 1911 and 1921 are arranged in the vertical direction, so that 1911 for the mobile station 191
When 11f is selected, 1921f is the mobile station 191 in the directional antenna of the sector antenna 1921.
Will be oriented to. However, since the sector antennas 1911 and 1921 are arranged at a half pitch interval here, even if the reception quality of 1911f is good, the reception quality of 1921f is not always good.
Antenna 1 at the position corresponding to the selected 1911f
The method according to the present invention in which 921 is selected as the diversity candidate antenna is effective.

FIG. 20 is a diagram showing selection of diversity candidate antennas of the base station in the second embodiment of the present invention. As shown in the figure, when the directional antenna 2011f of the base station 202 is selected, the sector antenna 202
The directional antenna corresponding to 2011f among the directional antennas of 1 is 2021f which is in the same direction as 2011f on the horizontal plane. Since the sector antennas 2011 and 2021 of the base station 202 are arranged in the vertical direction in this example, it can be considered that the 2021 is most oriented to the mobile station 201.

FIG. 21 is a diagram showing selection of diversity candidate antennas and communication antennas in the second embodiment of the present invention. In FIG. 21, of the directional antennas 2111f and 2121f of the base station 212 selected as diversity candidate antennas, 2111f is used as an antenna for communication with the mobile station 211 as shown in FIG. . The signal transmitted from the directional antenna selected in the mobile station 211, for example, the signal 211c is transmitted to the directional antenna 21 in the base station 212.
11 f, and the detector 1616 measures the transmission quality of the signal, for example, the bit error rate. 2121 which is another diversity candidate antenna of the base station 212
At f, the carrier wave of the signal is received, and the detector 1626 detects the reception level of the carrier wave.
When the bit error rate measured by the detector 1616 deteriorates below a certain threshold, another diversity candidate antenna of the base station 212, 2121f, is used as the next communication antenna and then transmitted to the mobile station 211. 2121f is used at the time and when receiving the signal from the mobile station 211.

In this example, the quality of the two directional antennas arranged in the vertical direction is constantly evaluated at the same time. Therefore, when the received signal deteriorates, the cause of the deterioration is that the height pattern changes due to ground reflection. If so, deterioration can be remedied by switching to 2121f arranged in the vertical direction. If the cause of the deterioration is shadowing, the deterioration can be remedied by retransmitting the signal.

FIG. 22 (a) shows the reception of a signal transmitted from the base station to the mobile station by the selected directional antenna in the second embodiment of the present invention and an example of the signal of two adjacent antennas on both sides. FIG. 22 (b) is a diagram showing transmission / reception timing of the signal, which shows how the unit receives the signal. As shown in FIG. 22A, the signal transmitted from the base station 222 is one directional antenna selected by the mobile station 221, for example, 2
When received at 21c, two signals having a certain number of bits in a part of the signal transmitted from the base station 222 are respectively 221 at the timing shown in FIG.
The signals are received by the directional antennas 221rb and 221rd on both sides of c, and the reception level of each signal is detected by the detector 155. The transmission quality of the signal received at 221rc, eg, the bit error rate, is measured by the detector 155, and if the measured bit error rate is below a certain threshold, 221rb, 22b.
In 1rd, the detected directional antenna having the highest reception level, for example, 221rd is used as the next communication antenna, and when transmitting to the base station 222 and receiving a signal from the base station 222, The selected 221rd is used.

FIG. 23 is a flow chart showing the branch switching algorithm of the second embodiment of the present invention.
In the figure, first, after communication is started between the mobile station 141 and the base station 142, after transmitting / receiving the notification signal,
A directional antenna used for communication in the mobile station 141 (example: 151c above), a directional antenna used in communication for the base station 142 (example: 1611f above), and a diversity candidate antenna (example: 1621f above) are selected. (S2301, S2302, S2303).

During normal communication, when the communication quality of the directional antenna used for communication in the base station 142 deteriorates below a certain threshold (S2304, S2305),
One diversity candidate antenna is used for communication with the mobile station 141 (S2306).

Also in the selected directional antenna,
When the communication quality deteriorates below a certain threshold (S230
7), directional antennas (eg: 151c) on both sides of the directional antenna (eg: 151c) used for communication of the mobile station 141.
A directional antenna having a high reception level is selected from the above 151b and 151d) (S2308), and this is selected by the base station 1
Used for communication with 42.

When the directional antenna of the mobile station 141 is continuously switched a fixed number of times and the communication quality of the fixed threshold cannot be obtained, the communication between the mobile station 141 and the base station 142 is not performed. , The notification signal is transmitted and received again (S2309).

FIG. 24 shows an antenna configuration example of the digital high-speed wireless communication device of the third embodiment according to the present invention. In the figure, a mobile station 241 and a base station 24
It is assumed that transmission / reception is performed with the two. Mobile station 241
Is a sector antenna 251 composed of 6 directional antennas
And the base station 242 has sector antennas 261 and 262 composed of six directional antennas. The base station 24
Two sector antennas 2 are arranged in a horizontal direction at intervals such that the line-of-sight with the mobile station 241 is not blocked by a moving object at the same time, and when performing transmission / reception with the mobile station 241, which of the two antennas is used. If the antenna is significantly degraded by shadowing, the other antenna is not significantly degraded by the shadowing.

FIG. 25 shows the configuration of the mobile station 241. Of the radio waves incident on the directional antennas 251a to 251f of the sector antenna 251, the radio waves incident on any sector by the sector changeover switch 252 are shown. Is selected, and the signal is received by the receiver 255 via the frequency changeover switch 258 and the TDM switch 253. The reception level of the radio wave is measured by the detector 256, and when the transmission quality of the signal is deteriorated below a certain threshold value, the control unit 257 switches the sector changeover switch 252 or the frequency changeover switch 258. Next, the signal transmitted from the transmitter 254 is transmitted as a radio wave from any of the directional antennas 251a to 251f via the TDM switch 253, the frequency changeover switch 258 and the sector changeover switch 252.

FIG. 26 shows the configuration of the base station 242. The signals simultaneously received by the two sector antennas 2611 and 2621 are directed by the sector changeover switches 2612 and 2622, one for each sector antenna. The signal incident from the antenna is the receiver 2
615, 2625 are reached. The communication quality of the signal received by each sector antenna is detected by the detector 2616,
Measured at 2626, and based on the result, the control unit 2
Reference numeral 607 denotes a transmitter 2604 and a transmission changeover switch 260.
8, reception changeover switch 2609, sector changeover switch 2
612, 2622 and the frequency changeover switch 261F,
262F is controlled. The signal transmitted from the transmitter 604 is transmitted by the transmission changeover switch 2608 and the sector changeover switch 2
612, 2622 and the frequency changeover switch 261F,
By switching 262F, one sector of the omnidirectional antennas of the base station 242 is transmitted. When the transmission quality of the signal selected by the reception changeover switch 2609 has deteriorated below a certain threshold, the transmission changeover switch 2608 and the frequency changeover switches 261F and 261
The directional antenna 2611a to
It is transmitted as a radio wave from any of 2611f and 2612a to 2612f.

As described above, in the example shown in the present embodiment, the mobile station 241 has one sector antenna having a plurality of directional antennas, and the base station 2 has one sector antenna.
There are two in 42. One is used for transmission from the directional antenna of the mobile station 241, one is used for reception, and one is used for transmission from the directional antenna of the base station 142. Select two to use.

FIG. 27 (a) shows how the base station transmits the broadcast signal to the mobile station in the third embodiment of the present invention, and FIG. 27 (b) shows the transmission timing of the broadcast signal. It is a figure. In the figure, before the communication between the mobile station 271 and the base station 272 is started, the base station 272 sends a broadcast signal to the sector antennas 2711 and 2711 shown in FIG.
From each of the directional antennas 21, the directional antennas 21 are transmitted at fixed time intervals in the order shown in FIG. These two antennas are horizontally arranged at an interval such that the line of sight with the mobile station 271 is not blocked by a moving object at the same time, and one of the two antennas is deteriorated due to shadowing when transmitting / receiving to / from the 271. However, it is considered that the other antenna is not significantly deteriorated by the shadowing. However, both of the two antennas
When receiving the interference due to the ground reflected wave, the frequency band of the notification signal is switched by the frequency changeover switch 261F or 262F.

FIG. 28A shows how the mobile station receives the broadcast signal in the third embodiment of the present invention.
FIG. 8 (b) is a diagram showing the transmission / reception timing of the notification signal from the base station to the mobile station. The mobile station 281 receives the notification signal at each directional antenna of the sector antenna 2811 shown in FIG. 28A at regular time intervals in the order shown in FIG. 28B as an example. Based on the quality of the received notification signal, the mobile station 281 has a directional antenna, such as 2811, included in the base station 282 that has transmitted the notification signal.
f and the received 281 directional antennas, for example, 28
1c is selected, and at the timing when 2811f receives,
Send a response signal. Here, various means for measuring the quality of the received broadcast signal can be considered, but they are as described in the first embodiment. The notification signal is also as described in the first embodiment.

FIG. 29 is a diagram showing selection of diversity candidate antennas of the base station in the third embodiment of the present invention. As shown in FIG. 29, when the directional antenna 291c of the mobile station 291 and the directional antenna 2911f of the base station 292 are selected as the communication antennas, the directional antennas of the sector antenna 2921 of 292 in FIG. Of these, 2921f, which corresponds to 2911f and is in the same direction on the horizontal plane as 2911f, is the diversity candidate antenna.

FIG. 30 is a diagram showing selection of diversity candidate antennas of the base station in the third embodiment of the present invention. As shown in the figure, when the directional antenna 3011f of the base station 302 is selected, the sector antenna 302
The directional antenna corresponding to 3011f among the directional antennas of 1 is 3021f, which is 3021f in the same direction on the horizontal plane. However, as can be seen from FIG. 10, the sector antenna 3021 is
Since it is located at a certain distance in the horizontal direction with respect to
The 021f is not always the most oriented to the mobile station 301. One of the sector antennas of the base station 301 3
The directional antenna 3011 selected in 021
The directional antenna 3021f corresponding to f and 3021a and 3021e arranged in the vicinity thereof are used for the mobile station 301.
The directional antenna, for example, 3021a that receives the highest quality signal is sequentially received by the sector antenna 3
The antenna is a diversity candidate antenna within 021.

FIG. 31 is a diagram showing selection of diversity candidate antennas and communication antennas of the base station in the third embodiment of the present invention. Directional antenna 3 of the base station 312 selected as a diversity candidate antenna
It is assumed that 3111f out of 111f and 3121a is used as an antenna for communication with the mobile station 311 as shown in FIG. The signal transmitted from the directional antenna selected by the mobile station 311 such as 311c is transmitted to the directional antenna 3111f at the base station 312.
Then, the detector 2616 measures the transmission quality of the signal, for example, the bit error rate. Base station 312
In the other diversity candidate antenna 3121f, the carrier wave of the signal is received, and the detector 262 detects
At 6, the reception level of the carrier is detected. When the bit error rate measured by the detector 2616 deteriorates below a certain threshold, another diversity candidate antenna 3121a of the base station 312 is used as the next communication antenna and then transmitted to the mobile station 311. Time and mobile station 3
When receiving the signal from 11, the 3121a is used.

In this example, since the qualities of two directional antennas arranged in the horizontal direction are constantly evaluated at the same time, if the deterioration of the received signal is caused by shadowing, the horizontal Arranged in three directions
By switching to 1a, deterioration can be relieved. If the deterioration is caused by a change in height pattern due to ground reflection or the like, the frequency changeover switch 26
By switching between 1F and 262F, deterioration can be relieved.

FIG. 32 (a) shows reception of a signal transmitted from a base station to a mobile station by a selected directional antenna and an example of the signal of two adjacent antennas on both sides in the third embodiment of the present invention. FIG. 32 (b) is a diagram showing transmission / reception timing of the signal, which shows how the unit receives the signal. As shown in FIG. 32 (a), the signal transmitted from the base station 322 is one directional antenna selected by the mobile station 321, for example, 3
When received at 21c, two signals having a certain number of bits in a part of the signal transmitted from the base station 322 are respectively 321 at the timing shown in FIG. 32 (b).
The signals are received by the directional antennas 321rb and 321rd on both sides of c, and the reception level of each signal is detected by the detector 256. The transmission quality of the signal received at 321 rc, eg, the bit error rate, is measured at the detector 256, and if the measured bit error rate is below a certain threshold, 321 rb, 32
In 1rd, the directional antenna with the highest detected reception level, for example, 321rd is used as the next communication antenna, and when transmitting to the base station 322 and receiving a signal from the base station 322 next, The selected 321rd is used.

FIG. 33 is a flow chart showing the algorithm of the third embodiment of the present invention. In the figure, first, after communication is started between the mobile station 241 and the base station 242, a directional antenna (for example, 251c) used for communication in the mobile station 241 after transmitting / receiving a notification signal, In the base station 242, a directional antenna (eg, 2611f) used for communication and a diversity candidate antenna (eg, 2621f) are selected (S3301, S3302, S3303, S330).
4).

During normal communication, when the communication quality of the directional antenna used for communication in the base station 242 deteriorates below a certain threshold (S3305, S330).
6) The mobile station 41 is connected to one diversity candidate antenna.
It is used for communication with (S3307).

Also in the selected directional antenna,
When the communication quality deteriorates below a certain threshold (S330
8), directional antennas (eg: 251c) on both sides of the directional antenna (eg: 251c) used for communication of the mobile station 241.
A directional antenna having a high reception level is selected from the above 251b and 251d) and used for communication with the base station 242 (S3309).

When the directional antenna of the mobile station 241 is continuously switched a fixed number of times and the communication quality of the fixed threshold cannot be obtained, the communication between the mobile station 241 and the base station 242 is not performed. , The notification signal is transmitted and received again (S3310).

In the above first to third embodiments of the present invention, the diversity candidate antenna of the base station is
Once selected, it does not switch during normal communication.

However, if the mobile station can receive the above-mentioned annunciation signal transmitted from the base station even during normal communication, the following embodiment can be realized.

A mobile station 34 having a sector antenna 341r composed of six directional antennas in FIG. 34A.
Sector antenna 34 consisting of 1 and 6 directional antennas
There is communication with the base station 342 having 21, 3422, 3423 and 3424.
It is assumed that the broadcast signals are sequentially transmitted from the directional antennas of the respective sector antennas of 2. Mobile station 341
Then, the respective broadcast signals are sequentially received by the directional antennas of the sector antenna 341r of the mobile station 341.
The broadcast signal transmitted from the directional antenna 3421f included in 21 is sequentially received by each of the directional antennas 341ra to 341rf included in the sector antenna 341r. In the mobile station 341, each directional antenna 341ra-
The storage device 3412 included in the mobile station 341 stores the strength of the notification signal received by the directional antenna having the highest reception level among the 341 rf received, for example, 341 rc.
Remember in. It should be noted that it is also possible to evaluate the quality of the broadcast signal here by error bits instead of strength.

Further, in the mobile station 341, the table of the reception level of the notification signal transmitted from each directional antenna of the base station 342 is prepared as shown in FIG. 34 (b), and the table is transmitted from the directional antenna 3421f. When the notification signal has the highest reception level among the notification signals transmitted from the sector antenna 3421, the diversity candidate antenna change request signal is included in the next signal to be transmitted, and the base station 34
2 receives the diversity candidate antenna change request signal and then changes the diversity candidate antenna in the sector antenna 3421 to 3421f, or
Leave at 21f.

In this embodiment, it is necessary to receive the annunciation signal during communication, but there are two cases where the frequency of the communication signal is different from the frequency of the annunciation signal and when these two frequencies are the same. . When the two frequencies are different, it is necessary to switch the reception frequency at the timing of the notification signal by a synthesizer or to have two oscillators in order to receive the notification signal during communication. The directional antenna determined to be the optimum signal may not be optimum at the communication frequency. On the other hand, when the communication frequency is the same as the frequency of the notification signal, the above problem does not occur.

[0069]

As described above, according to the present invention,
By arranging multiple antennas at one terminal, the transmission quality of multiple routes can be detected at the same time, and the transmission quality of other routes can be measured sequentially after the degradation of the transmission quality of routes as in the conventional technology. Since there is no need to do so, fast and reliable switching is possible.

Further, it is efficient because it is not necessary to constantly transmit a dedicated test burst for the purpose of measuring the quality of the communication path for selecting the communication path.

Furthermore, by disposing a plurality of antennas at one terminal, it is possible to reduce quality deterioration due to shadowing and waveform distortion. Transmit diversity can be performed by arranging a single sector antenna in one terminal and arranging a plurality of sector antennas in the other terminal, and in a terminal having a single sector antenna, one sector antenna is included in the sector antenna. Since one directional antenna is used for transmission and reception with the other terminal, interference of reflected waves can be prevented.

Moreover, it is possible to select a communication path of optimum quality by measuring the quality of the communication path with a small number of antennas while having a large number of directional antennas.

[Brief description of drawings]

FIG. 1 is a diagram showing a multipath problem for communication between two terminals in a conventional example.

FIG. 2 is a diagram showing an example of a prior branch candidate group selection algorithm in a conventional example.

FIG. 3 is a flowchart showing a branch switching algorithm in a conventional example.

FIG. 4 is a diagram showing an antenna arrangement of a mobile station and a base station according to the first embodiment of the present invention.

5 is a diagram showing a configuration of the mobile station of FIG.

FIG. 6 is a diagram showing a configuration of a base station of FIG.

[Fig. 7] Fig. 7 is a diagram showing a manner of transmitting a broadcast signal from each directional antenna of the base station to the mobile station and a transmission timing of the broadcast signal from each directional antenna of the base station to the mobile station in the present invention.

FIG. 8 shows how a directional antenna of a mobile station receives a broadcast signal and a timing of transmitting / receiving a broadcast signal from the base station to each directional antenna of the mobile station according to the first embodiment of the present invention. It is a figure.

FIG. 9 is a diagram showing an example of selection of diversity candidate antennas of a base station according to the first embodiment of the present invention.

FIG. 10 is a diagram showing another example of selection of diversity candidate antennas of the base station in the first embodiment example of the present invention.

FIG. 11 is a diagram showing selection of diversity candidate antennas and communication antennas of a base station in the first embodiment example of the present invention.

FIG. 12 is a view showing how a signal transmitted from a base station to a mobile station is received by a selected directional antenna according to the present invention and a part of the signal by two antennas on both sides of the selected directional antenna. FIG. 3 is a diagram showing the reception of the signal and the transmission / reception timing of the signal.

FIG. 13 is a flowchart showing a branch switching algorithm according to the first embodiment of this invention.

FIG. 14 is a diagram showing an antenna arrangement of a mobile station and a base station according to the second embodiment of the present invention.

15 is a diagram showing a configuration of the mobile station of FIG.

16 is a diagram showing a configuration of the base station of FIG.

FIG. 17 is a diagram showing how the directional antennas of the base station transmit the broadcast signal to the mobile station and the broadcast signals of the directional antennas of the base station to the mobile station according to the second embodiment of the present invention. It is a figure which shows transmission timing.

FIG. 18 is a view showing reception of a broadcast signal in each directional antenna of the mobile station according to the second embodiment of the present invention;
It is a figure which shows the transmission / reception timing of the alerting | reporting signal from a base station to each directional antenna of a mobile station.

FIG. 19 is a diagram showing an example of selection of diversity candidate antennas of a base station in the second embodiment example of the present invention.

FIG. 20 is a diagram showing another example of selection of diversity candidate antennas of a base station in the second embodiment example of the present invention.

FIG. 21 is a diagram showing an example of selection of a diversity candidate antenna and a communication antenna in a base station according to the second embodiment of the present invention.

FIG. 22 is a view showing how a signal transmitted from a base station to a mobile station is received by a selected directional antenna according to the present invention, and a part of the signal by two antennas on both sides of the selected directional antenna. FIG. 3 is a diagram showing the reception of the signal and the transmission / reception timing of the signal.

FIG. 23 is a flow chart showing a branch switching algorithm of the second exemplary embodiment of the present invention.

FIG. 24 is a diagram showing an antenna arrangement of a mobile station and a base station in the third embodiment example of the present invention.

FIG. 25 is a diagram showing the configuration of the mobile station of FIG. 24.

FIG. 26 is a diagram showing the configuration of the base station of FIG. 24.

FIG. 27 is a view showing how the directional antennas of the base station transmit the broadcast signal to the mobile station and the broadcast signals of the directional antennas of the base station to the mobile station in the third embodiment of the present invention. It is a figure which shows transmission timing.

FIG. 28 is a diagram showing how a directional antenna of a mobile station receives a broadcast signal according to the third embodiment of the present invention;
It is a figure which shows the transmission / reception timing of the alerting | reporting signal from a base station to each directional antenna of a mobile station.

FIG. 29 is a diagram showing an example of selection of diversity candidate antennas of a base station according to the third embodiment of the present invention.

FIG. 30 is a diagram showing another example of selection of diversity candidate antennas of a base station in the third embodiment example of the present invention.

FIG. 31 is a diagram showing an example of selection of diversity candidate antennas and communication antennas of a base station in the third embodiment of the present invention.

FIG. 32 is a view showing how a signal transmitted from a base station to a mobile station is received by a selected directional antenna according to the third embodiment of the present invention, and two signals are provided on both sides of the selected directional antenna. It is a figure which shows the reception of some signals of the said signal in one antenna, and the transmission / reception timing of this signal.

FIG. 33 is a flow chart showing a branch switching algorithm of the third exemplary embodiment of the present invention.

FIG. 34 is an example of switching diversity candidate antennas;
It is a figure which shows the table showing the rank of the receiving level of the alerting | reporting signal transmitted from the sector antenna which a base station has.

[Explanation of symbols]

110 wireless telephone 120 node 130 structure 170 structure 41 mobile station 42 base station 51 mobile station sector antennas 51a to 51f mobile station directional antenna 52 mobile station sector changeover switch 53 mobile station TDM switch 54 mobile station transmitter 55 mobile station reception Machine 56 Mobile station detector 57 Mobile station controller 61-64 Base station sector antenna 611a-611f, 621a-621f, 631a-
631f, 641a to 641f Base station directional antennas 612, 622, 632, 642 Base station sector switch 613, 623, 633, 643 Base station TDM switch 604 Base station transmitter 615, 625, 635, 645 Base station receiver 616 , 626, 636, 646 Base station detector 607 Base station control unit 608 Base station transmission changeover switch 609 Base station reception changeover switch 71 Mobile station 71r Mobile station sector antenna 71a to 71f Mobile station directional antenna 72 Base station 711 to 741 Base Station sector antennas 711a to 711f, 721a to 721f, 731a to
731f, 741a to 741f Base station directional antenna 81 Mobile station 81r Mobile station sector antenna 81a to 81f Mobile station directional antenna 82 Base station 811 to 841 Base station sector antenna 811a to 811f, 821a to 821f, 831a to
831f, 841a to 841f Base station directional antenna 91 Mobile station 91r Mobile station sector antenna 91a to 91f Mobile station directional antenna 92 Base station 911 to 941 Base station sector antenna 911a to 911f, 921a to 921f, 931a to
931f, 941a to 941f Base station directional antenna 101 Mobile station 101r Mobile station sector antenna 101a to 101f Mobile station directional antenna 102 Base station 1011 to 1041 Base station sector antenna 1011a to 1011f, 1021a to 1021f, 1
031a to 1031f, 1041a to 1041f Base station directional antenna 111 Mobile station 111r Mobile station sector antenna 111a to 111f Mobile station directional antenna 112 Base station 1111 to 1141 Base station sector antenna 1111a to 1111f, 1121a to 1121f, 1
131a to 1131f, 1141a to 1141f Base station directional antenna 121 Mobile station 121r Mobile station sector antenna 121a to 121f Mobile station directional antenna 122 Base station 1211 to 1241 Base station sector antenna 1211a to 1211f, 1221a to 1221f, 1,
231a to 1231f, 1241a to 1241f Base station directional antenna 141 Mobile station 142 Base station 151 Mobile station sector antenna 151a to 151f Mobile station directional antenna 152 Mobile station sector selection switch 153 Mobile station TDM switch 154 Mobile station transmitter 155 Mobile station Receiver 156 Mobile station detector 157 Mobile station control section 161, 162 Base station sector antenna 1611a-1611f, 1621a-1621f Base station directional antenna 1612, 1622 Base station sector changeover switch 1613, 1623 Base station TDM switch 1604 Base station transmission 1615, 1625 Base station receiver 1616, 1626 Base station detector 1607 Base station control unit 1608 Base station transmission changeover switch 1609 Base station reception changeover switch 171 Mobile station 71r Mobile station sector antenna 171a-171f Mobile station directional antenna 172 Base station 1711, 1721 Base station sector antenna 1711a-1711f, 1721a-1721f Base station directional antenna 181 Mobile station 181r Mobile station sector antenna 181a-181f Mobile station directional Antenna 182 Base station 1811, 1821 Base station sector antenna 1811a-1811f, 1821a-1821f Base station directional antenna 191 Mobile station 191r Mobile station sector antenna 191a-191f Mobile station directional antenna 192 Base station 1911, 1921 Base station sector antenna 191a -1911f, 1921a-1921f Base station directional antenna 201 Mobile station 201r Mobile station sector antenna 201a-201f Mobile station directional antenna Tena 202 Base station 2011, 2021 Base station sector antenna 2011a to 2011f, 2021a to 2021f Base station directional antenna 211 Mobile station 211r Mobile station sector antenna 211a to 211f Mobile station directional antenna 212 Base station 2111, 2121 Base station sector antenna 2111a -2111f, 2121a-2121f Base station directional antenna 221 Mobile station 221r Mobile station sector antenna 221a-221f Mobile station directional antenna 222 Base station 2211, 2221 Base station sector antenna 2211a-2211f, 2221a-2221f Base station directional antenna 241 Mobile station 242 Base station 251 Mobile station sector antennas 251a to 251f Mobile station directional antenna 252 Mobile station sector switch 253 Mobile station DM switch 254 mobile station transmitter 255 mobile station receiver 256 mobile station detector 257 mobile station control units 261 and 262 base station sector antennas 2611a to 2611f and 2621a to 2621f base station directional antennas 2612 and 2622 base station sector changeover switch 2613 , 2623 Base station TDM switch 2604 Base station transmitter 2615, 2625 Base station receiver 2616, 2626 Base station detector 2607 Base station control unit 2608 Base station transmission changeover switch 2609 Base station reception changeover switch 261F, 262F Base station frequency changeover switch 271 mobile station 271r mobile station sector antenna 271a to 271f mobile station directional antenna 272 base station 2711, 2721 base station sector antenna 2711a to 2711f, 2721a to 2721 f Base station directional antenna 281 Mobile station 281r Mobile station sector antenna 281a to 281f Mobile station directional antenna 282 Base station 2811, 2821 Base station sector antenna 2811a to 2811f, 2821a to 2821f Base station directional antenna 291 Mobile station 291r Mobile station Sector antennas 291a to 291f Mobile station directional antennas 292 Base stations 2911, 2921 Base station sector antennas 2911a to 2911f, 2921a to 2921f Base station directional antennas 301 Mobile stations 301r Mobile station sector antennas 301a to 301f Mobile station directional antennas 302 Bases Stations 3011, 3021 Base station sector antennas 3011a to 3011f, 3021a to 3021f Base station directional antennas 311 Mobile stations 311r Mobile station sector antennas Tena 311a to 311f Mobile station directional antenna 312 Base station 3111, 3121 Base station sector antenna 3111a to 3111f, 3121a to 3121f Base station directional antenna 321 Mobile station 321r Mobile station sector antenna 321a to 321f Mobile station directional antenna 322 Base station 3211, 3221 base station sector antennas 3211a to 3211f, 3221a to 3221f base station directional antenna 341 mobile station 341r mobile station sector antenna 341ra to 341rf mobile station directional antenna 3412 mobile station sector changeover switch 3413 mobile station TDM switch 3414 mobile station transmission Machine 3415 Mobile station receiver 3416 Mobile station detector 3417 Mobile station storage device 342 Base station 3421 to 3424 Base station sector antenna 3421f Chikyoku directional antenna

Claims (8)

[Claims] 1. A digital high-speed wireless communication device for communicating between a first terminal and a second terminal, wherein the first terminal has Nr (Nr is a positive integer of 1 or more) directivity. And a sector antenna composed of Nc (Nc is a positive integer greater than or equal to 1) M sector antennas (M is a positive integer greater than or equal to 2). (Which is an integer), the transmission quality of a communication path is detected in at least one of the first terminal and the second terminal, and the first terminal and the second terminal have the detection result from the detection result. A digital high-speed wireless communication device, characterized in that selection means for selecting one or more from each of the directional antennas is provided. 2. A total of Nc of M1 (M1 is a positive integer M1 ≦ M) sector antennas among the M sector antennas of the second terminal.
2. The digital high-speed wireless communication device according to claim 1, wherein the broadcast signal is sequentially transmitted from 1 (N1 = Nc * M1) directional antennas at regular time intervals. 3. A response signal is sequentially received from the directional antenna at a timing after a predetermined time from the timing of transmitting the notification signal, and Nr of the first terminal is provided.
The directional sectors sequentially receive the annunciation signal, and one directional antenna included in the first terminal selected by the selecting means to N included in the second terminal.
3. The digital high-speed wireless communication device according to claim 2, wherein the response signal is transmitted at the timing when the directional antenna selected by the selecting means out of the c directional antennas is received. 4. The j-th (j = 1, 2, 3) of the i-th (i = 1, 2, 3, ..., M) sector antenna of the directional antennas of the second terminal.・ ・ ・ ・ ・ ・ N
When the directional antenna of c) is selected as the communication antenna, the k-th (k = 1, 2, 3, ..., M, and k ≠)
i) corresponding to the directional antenna selected as the communication antenna among the Nc directional antennas in the sector antenna, and the j-th (j = 1) in the same direction as the directional antenna on the horizontal plane. , 2, 3, ..., Nc) directional antennas are used as diversity candidate antennas.
4. The digital high-speed wireless communication device according to any one of 3 to 3. 5. The kth directional antenna selected from the directional antennas of the second terminal when the jth directional antenna in the ith sector antenna is selected as the communication antenna.
Corresponding to the directional antenna selected as the communication antenna among the Nc directional antennas in the sector antenna of, and close to the j-th directional antenna in the same direction on the horizontal plane as the directional antenna. Mc (m
c is a positive integer such that 1 <mc <Nc) directional antennas sequentially receive the synchronization bursts transmitted from the first terminal, and the reception quality of the synchronization bursts causes the synchronization bursts in the kth sector antenna to be received. The digital high-speed wireless communication device according to claim 1, wherein a diversity candidate antenna is selected. 6. One of the Nr directional antennas of the first terminal is selected, and one of the plurality of directional antennas of the second terminal communicates. At least one directional antenna is selected as a diversity candidate antenna, and a signal transmitted from the selected directional antenna of the first terminal is used as a communication antenna of the second terminal. Received by the selected directional antenna to evaluate the quality of the received signal and monitor the received quality at the directional antenna selected as the diversity candidate antenna, and monitor the result and the signal received by the communication antenna. Whether it is a communication antenna or a diversity candidate antenna according to the quality evaluation result One directional antenna is newly selected as a communication antenna, and the communication newly selected at the second terminal when transmitting a signal to the first terminal and when receiving a signal from the first terminal is newly selected. The digital high-speed wireless communication device according to any one of claims 1 to 5, wherein the antenna for use is used. 7. The signal transmitted from a second terminal when a major portion of the signal transmitted from the second terminal is received at one directional antenna selected at the first terminal. Each of the mr signals (mr is a positive integer 1 <mr <Nr) having a constant number of bits in a portion of the m-th signal is located near the selected directional antenna of the first terminal. Based on the transmission quality of the signals respectively received by the directional antennas and received by the selected directional antennas of the first terminal and the quality of the signals received by the mr directional antennas, One of the selected directional antennas and the mr directional antennas is newly selected as the directional antenna used for communication of the first terminal. 7. The directional antenna newly selected in the first terminal is used when transmitting a signal to the second terminal and when receiving a signal from the second terminal next. The digital high-speed wireless communication device according to the item. 8. One of the Nr directional antennas of the first terminal is selected as a communication antenna, and the Mc sector antennas of the second terminal each have Nc directional antennas. Of the directional antennas are selected as diversity candidate antennas, respectively, and Nc of the M sector antennas at the second terminal are N in total (N = Nc × M). A notification signal is sequentially transmitted from the directional antennas at regular time intervals, and the level of the notification signal received at the first terminal is stored in a storage device included in the first terminal. The terminal creates a table of the level of the received notification signal for each directional antenna of the second terminal, and receives the table. The table is updated at any time according to the level of the broadcast signal, and the quality of the broadcast signal received at the first terminal among the M sector antennas of the second terminal is A diversity candidate antenna change request signal for notifying the best directional antenna is transmitted, the second terminal receives the diversity candidate antenna change request signal, and a diversity candidate is received in each sector antenna of the second terminal. The antenna is changed to the directional antenna notified by the diversity candidate antenna change request signal, and then the newly selected diversity candidate antenna is selected in the second terminal when the reception quality of the signal from the first terminal is monitored. Claim 1 to be used
8. The digital high-speed wireless communication device according to any one of items 1 to 7.