JPH10145273A - Mobile communication controller - Google Patents

Abstract

PROBLEM TO BE SOLVED: To selectively transmit a polarized wave as a signal wave that is sent from a base station to a mobile station, so that the mobile station can always acquire a satisfactory receiving state. SOLUTION: A signal wave that is sent from a mobile station is received by each polarized wave element 10a and 10b of an antenna 10 and supplied to each movable contact of a switching device 12 and each input terminal of a diversity control circuit 13. When a receiving signal that is outputted from a horizontal polarized wave element 10a is stronger than a receiving signal that is outputted from a vertical polarized wave element 10b, the circuit 13 supplies the receiving signal that is outputted from the element 10a to a receiver 15 and to the device 12, generates a switching signal S1a which makes a fixed contact connect to a movable contact on the side of a transmitting separator 11a. As a result, a signal that is sent from a transmitter 14 is transmitted from the element 10a via the separator 11a.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention is applied to a base station of a mobile radio communication device (hereinafter, sometimes referred to as a mobile station) such as a mobile phone, a mobile phone, or a simplified mobile phone (PHS). Mobile communication control apparatus, in particular, a mobile communication control apparatus that transmits a signal wave transmitted from a base station to a mobile station in a polarization mode that is expected to obtain a good reception state in the mobile station. Related to the device.

[0002]

2. Description of the Related Art Conventional mobile telephones and relatively large-sized shoulder telephones in which a handset and a transmitting / receiving unit are independent from each other are used in such a state that the antenna is used in a state where the antenna stands in a vertical direction with respect to the ground. The transmitted signal wave was almost limited to vertical polarization. For this reason, as shown in FIG.
a, a wireless base station spatial diversity receiving antenna 71 incorporating a vertical polarization element 72a, and a wireless base station spatial diversity transmitting / receiving antenna 72 similarly incorporating a vertical polarization element 72a.
A diversity circuit 73 that selectively supplies the stronger one of the signal waves received by the antennas 71 and 72 to the receiver 15; and a diversity circuit 73.
And a transmitter / receiver 74 for connecting one of the transmitters 14 to the diversity transmitting / receiving antenna 72.

[0003] On the other hand, in mobile phones and small mobile phones such as PHSs (which may be simply referred to as mobile phones hereinafter) which are rapidly spreading at present, a handset and a transmission / reception circuit unit are integrally formed. Therefore, the angle of the antenna from the zenith direction at the time of a call greatly differs depending on the use state, and the plane of polarization of the transmission wave transmitted from the mobile station cannot be uniquely determined. For this reason, as shown in FIG. 8, the transmission / reception equipment of the base station is provided with a polarization diversity antenna 80 for a radio base station incorporating both the horizontal polarization element 81 and the vertical polarization element 82, and Of the horizontal polarization and the vertical polarization received by the elements 81 and 82, only the signal wave having the strongest intensity is controlled to be selectively received by the diversity circuit 73 and supplied to the receiver 15.
Further, the transmission signal transmitted from the transmitter 14 is configured to be fixedly transmitted only from the vertical polarization element 82 via the transmission / reception separator 74.

[0004]

In the prior art described above, the signal transmitted from the base station to the mobile station regardless of the intensity of the vertical and horizontal polarizations transmitted from the mobile station and received by the base station. Waves were always limited to vertical polarization. However, when the base station detects the horizontal polarization stronger than the vertical polarization, the antenna of the partner mobile station is often horizontal with respect to the ground. Therefore, in such a case, if the base station also transmits the horizontally polarized waves to the mobile station, the reception state at the mobile station is improved. However, in the above-described base station of the related art, even when horizontal polarization is detected more strongly than vertical polarization, the transmission wave is always vertical polarization, so that the mobile station does not always obtain the optimal reception state. There was no problem.

[0005] An object of the present invention is to solve the above-mentioned problems of the prior art, and selectively use a polarization such that a good reception state can always be obtained in a mobile station as a signal wave transmitted from a base station to the mobile station. To provide a mobile communication control device that transmits the data to the mobile communication control device.

[0006]

Means for Solving the Problems In order to achieve the above object, the present invention is characterized in that the following means are taken. (1) Predict the attitude of the antenna of the mobile station that is the partner station based on the strength of each polarization transmitted from the mobile station and received by the base station, and determine the optimal polarization for the predicted antenna attitude. Was sent. (2) Predict the form of the mobile station, which is the partner station, based on identification information included in each polarization transmitted from the mobile station and received by the base station. If the antenna is likely to be used in a state close to vertical to the ground, transmit vertically polarized waves. If the mobile station is a mobile phone or PHS and the antenna is horizontal to the ground, When it is likely to be used in a close state, horizontal polarization is transmitted. (3) Transmit the vertically polarized wave on the control channel where the antenna attitude of the mobile station that is the partner station is likely to be nearly vertical to the ground, and the antenna attitude is nearly horizontal to the ground. The horizontal polarization is transmitted on the communication channel which is likely to be. (4) For each time slot, the attitude of the antenna of the mobile station, which is the partner station, is predicted, and the polarization optimal to the predicted attitude of the antenna is transmitted.

According to each of the above-described configurations, the mobile station can receive a polarized wave suitable for the attitude of its own antenna, so that a good reception state can always be obtained.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, an embodiment of the present invention will be described in detail with reference to the drawings. FIG. 1 is a block diagram showing a configuration of a transmission / reception facility of a base station according to a first embodiment of the present invention, wherein the same reference numerals as those described above denote the same or equivalent parts. The dual-polarization antenna 10 for a radio base station incorporates a horizontal polarization element 10a and a vertical polarization element 10b. In actual use, a multi-stage antenna array is used for increasing the gain and beam forming of the antenna. However, in order to make the description easy to understand, a single-stage antenna will be described as an example.

The horizontal polarization element 10a is connected to one movable contact of the switching device 12 and one input terminal of the diversity control circuit 13 via a transmission / reception separator 11a. The vertical polarization element 10b is connected to the other movable contact of the switching device 12 and the diversity control circuit 1 via the transmission / reception separator 11b.
3 is connected to the other input terminal. A transmitter 14 is connected to a fixed contact of the switching device 12, and a receiver 15 is connected to an output terminal of the diversity control circuit 13. As described later in detail with reference to FIG. 2, the diversity control circuit 13 compares the strength of the received signal input to each input terminal and selectively supplies the stronger signal to the receiver 15. A switching circuit S for switching the contacts of the switching device 12 in accordance with the result of the comparison.
1 (S1a or S1b) switching signal generator 13b
Are provided.

FIG. 2 shows the diversity control circuit 13.
FIG. 3 is a block diagram showing a configuration of a main part of a comparison unit 13 for comparing the strength of the reception signal input from each input terminal.
2 and an output selector 133 for selectively or combining the stronger one of the received signals input from the respective input terminals based on the comparison result signal S2 output from the comparator 132. A signal generation circuit for generating a switching signal S1 for switching a contact of the switching device 12 based on the comparison result signal S2 such that a transmission signal is output from a polarization element receiving a strong signal wave. And a part 134. In the present embodiment, the diversity circuit unit 13a and the switching signal generation unit 13b are compared with the comparison unit 13
2 is used, the simplification and downsizing of the circuit configuration as the diversity control circuit 13 is realized.

In such a configuration, the signal wave transmitted from the mobile station is transmitted to each of the polarization elements 10a and 10a of the antenna 10.
b, and the received signal is transmitted to each of the transmission / reception separators 11a and 11b.
Through the switching device 12 and the input terminal of the diversity control circuit 13. Here, if the received signal output from the horizontal polarization element 10a is stronger than the reception signal output from the vertical polarization element 10b, the diversity circuit unit 13a of the diversity control circuit 13
Supplies the reception signal output from the horizontal polarization element 10a to the receiver 15, and the switching signal generator 13b
, A switching signal S1a for connecting the fixed contact to the movable contact on the transmission separator 11a side is generated. As a result,
The signal transmitted from the transmitter 14 is transmitted from the horizontal polarization element 10a via the transmission separator 11a.

On the contrary, if the received signal output from the vertical polarization element 10b is stronger, the diversity circuit section 13a of the diversity control circuit 13 converts the received signal output from the vertical polarization element 10b. The switching signal generator 13b supplies the fixed contact to the transmission separator 1
A switching signal S1b for connecting to the movable contact on the 1b side is generated. As a result, the signal transmitted from the transmitter 14 is transmitted from the vertical polarization element 10b via the transmission separator 11b.

As described above, according to this embodiment, a mobile station transmitting a radio wave having a strong horizontal polarization component, in other words, a mobile station whose antenna attitude is predicted to be nearly horizontal with respect to the ground is transmitted to the mobile station. Is transmitting a radio wave with a strong vertical polarization component while transmitting horizontally polarized waves, in other words, a mobile station whose antenna attitude is predicted to be close to vertical with respect to the ground. Since the polarized wave is transmitted, the mobile station can receive the polarized wave suitable for the attitude of the antenna, so that a good reception state can always be obtained.

[0014] Even if the mobile station has an antenna perpendicular to the ground, the plane of polarization may change during propagation and the base station may strongly detect horizontal polarization. Even in this case, if the base station transmits the same polarization as the reception wave, the polarization plane of this transmission wave also changes during propagation, so the mobile station uses a polarization suitable for the attitude of its own antenna. Can be received.

FIG. 3 is a block diagram showing a configuration of a transmission / reception facility of a base station according to a second embodiment of the present invention, and the same reference numerals as those described above denote the same or equivalent parts. In the present embodiment, information indicating the form of each mobile station, that is, form information indicating whether the mobile station is a car phone or a small mobile phone, identification information unique to each mobile station (for example, a subscriber number), Are registered in the exchange 20 in advance in association with each other.

When detecting the identification information of each mobile station included in the received signal, the polarization mode selection circuit 21 obtains the form information of the mobile station from the exchange 20 based on the identification information. When the mobile station is a car phone and the antenna is likely to be used in a state close to the vertical with respect to the ground, the reception signal output from the vertical polarization element 10b is supplied to the receiver 15. On the other hand, for the switching device 12, a switching signal S1b for connecting the fixed contact to the movable contact on the transmission separator 11b side is generated. As a result, the signal transmitted from the transmitter 14 is transmitted from the vertical polarization element 10b via the transmission separator 11b.

If the mobile station is a mobile phone and the antenna is likely to be used in a state where the antenna is nearly horizontal with respect to the ground, the polarization mode selection circuit 21
While the received signal output from Oa is supplied to the receiver 15, the switching device 12 generates a switching signal S1a for connecting the fixed contact to the movable contact on the transmission separator 11a side. As a result, the signal transmitted from the transmitter 14 is transmitted from the horizontal polarization element 10a via the transmission separator 11a.

As described above, according to the present embodiment, the attitude of the antenna in use is determined based on the form of the mobile station determined based on the identification information. If it is highly likely that the mobile station will be used near vertical to the ground, transmit vertically polarized waves, and the mobile station is a mobile phone and the antenna is used near horizontal to the ground. If the possibility is high, horizontal polarization is transmitted. As a result, the mobile station can receive a polarized wave suitable for the attitude of the antenna, and can always obtain a good reception state.

FIG. 4 is a block diagram showing the configuration of a transmission / reception facility of a base station according to a third embodiment of the present invention. The same reference numerals as those described above denote the same or equivalent parts. In the present embodiment, one antenna is provided between the antenna 10 of the first embodiment described with reference to FIG. 1 and each of the transmission / reception separators 11a and 11b.
/ 4 wavelength line coupling type 90 ° hybrid circuit 41 is provided.
A 90 ° phase shifter 42 is further provided between the horizontal phase shifter 10a and the horizontal polarization element 10a in this embodiment.

According to such a configuration, to the diversity control circuit 13, signals representing the intensities of the respective polarized waves which are inclined at + 45 ° and −45 ° with respect to the ground and are orthogonal to each other are input. Diversity circuit section 13a
Is, for example, +45 input via the transmission / reception separator 11b.
If the received signal related to the polarization is stronger, the received signal is supplied to the receiver 15, and the switching signal generator 13b causes the switching device 12 to connect the fixed contact to the movable contact on the transmission separator 11b side. Switch signal S1b is generated. As a result, the signal transmitted from the transmitter 14 is transmitted to the transmission separator 11b.
And 90 ° hybrid circuit 41 to supply each of polarization elements 10a and 10b,
° Polarization will be transmitted.

Conversely, if the received signal relating to the −45 ° polarization input through the transmission / reception separator 11a is stronger, the diversity control circuit 13 supplies the received signal to the receiver 15, while For the switching device 12, a switching signal S1a for connecting the fixed contact to the movable contact on the transmission separator 11a side is generated. As a result, the signal transmitted from the transmitter 14 is transmitted to the transmission separator 11a, the 90 ° phase shifter 4
Are supplied to the respective polarization elements 10 a and 10 b via the 2 and 90 ° hybrid circuit 41, and -4 from the antenna 10.
5 ° polarization will be transmitted.

As described above, according to the present embodiment, + 45 °
If the polarization is strongly received, a + 45 ° polarization is transmitted to the mobile station, and if the −45 ° polarization is strongly received, the −45 ° polarization is transmitted to the mobile station. Therefore, the mobile station can receive a polarized wave suitable for the attitude of the antenna, and a good reception state can always be obtained.

FIG. 5 is a block diagram showing a configuration of a transmission / reception facility of a base station according to a fourth embodiment of the present invention. The same reference numerals as those described above denote the same or equivalent parts. In the present embodiment, a 1/4 distance is provided between the antenna 10 of the first embodiment described with reference to FIG.
It is characterized in that only the wavelength line coupling type 90 ° hybrid circuit 41 is provided.

According to such a configuration, the diversity control circuit 13 receives the signals representing the intensities of the right-handed and left-handed circularly polarized waves. Diversity circuit part 1
3a, for example, when the received signal related to right-handed circular polarization input via the transmission / reception separator 11a is stronger, supplies the received signal to the receiver 15, and the switching signal generator 13b sends the switching signal to the switching device 12. Then, a switching signal S1a for connecting the fixed contact to the movable contact on the transmission separator 11a side is generated. As a result, the signal transmitted from the transmitter 14 is
a and a 90 ° hybrid circuit 41 to supply each of the polarization elements 10 a and 10 b, and the antenna 10 transmits a right-handed circularly polarized wave.

Conversely, if the received signal relating to left-hand circular polarization is stronger, the diversity control circuit 13 supplies the received signal to the receiver 15 while the switching device 12 To generate a switching signal S1b for connecting to the movable contact on the transmission separator 11b side. As a result,
The signal transmitted from the transmitter 14 is transmitted through the transmission splitter 11a and the 90 ° hybrid circuit 41 to each polarization element 10
a, 10b, and the antenna 10 transmits a left-handed circularly polarized wave.

According to this embodiment, if the right-handed circularly polarized wave can be received strongly, the right-handed circularly polarized wave is transmitted to the mobile station. If the left-handed circularly polarized wave can be received strongly, the mobile station can receive the left-handed circularly polarized wave. Is transmitted, the mobile station can receive a polarized wave suitable for the attitude of the antenna, and a good reception state can always be obtained.

In each of the above-described embodiments, the base station transmits to the mobile station based on the strength of each received polarization and the attitude of the antenna of the mobile station predicted based on the form of the mobile station. Although the description has been made assuming that the polarization plane of the transmission wave is selected, in the fifth and sixth embodiments of the present invention described below, the polarization is selected in a time-division manner at each predetermined timing or period.

Communication modes in a general automobile / mobile phone system are roughly classified into a control channel called a paging channel and a subsequent communication channel, for example. Here, the mobile phone in a standby state is often held in a posture in which the antenna is perpendicular to the ground, and is often used in a posture close to horizontal when talking after receiving a call. Therefore, in the fifth embodiment of the present invention, a vertically polarized wave is transmitted on a control channel mainly used during standby, and a horizontally polarized wave is transmitted on a communication channel during a call.

According to the present embodiment, a vertically polarized wave is transmitted on the control channel where the attitude of the antenna of the mobile station is likely to be perpendicular to the ground, and the attitude of the antenna can be horizontal to the ground. Since a horizontally polarized wave is transmitted in a communication channel having high performance, the mobile station can receive a polarized wave suitable for the attitude of the antenna, and a good reception state can always be obtained.

In a digital automobile / mobile phone system, information may be transmitted and received in a time-division manner for each predetermined time slot. In such a case, a received radio wave is analyzed for each time slot. It is desirable that the polarization is frequently switched according to the reception intensity. Therefore, in a sixth embodiment of the present invention, as shown in FIG.
In a system in which information is transmitted and received in a time-division manner for each predetermined time slot, the intensity of the received radio wave is compared for each of one or more time slots in the same manner as described above, and the polarization plane of the transmission wave is determined based on the comparison result. Changed frequently.

According to the present embodiment, the strength of the received radio wave is frequently detected, and the optimum polarization is transmitted at each detection timing. A good reception state can always be obtained.

[0032]

As described above, according to the present invention, the following effects can be achieved. (1) Compare the strength of the received horizontal polarization and vertical polarization,
A mobile station that transmits a horizontally polarized wave to a mobile station whose antenna attitude is predicted to be nearly horizontal with respect to the ground, while a mobile station whose antenna attitude is predicted to be close to vertical to the ground Since the mobile station transmits a vertically polarized wave, the mobile station can receive a polarized wave suitable for the attitude of the antenna, and a good reception state can always be obtained. (2) Determine the attitude of the mobile station antenna based on the identification information included in the received wave, the possibility that the mobile station is a car phone and the antenna attitude is used near vertical to the ground If the mobile station is a mobile phone or PHS and the antenna is likely to be used in a state that is nearly horizontal with respect to the ground, transmit horizontal polarization. As a result, the mobile station can receive a polarized wave suitable for the attitude of the antenna, and a good reception state can always be obtained. (3) A mobile station transmitting a polarization close to + 45 ° polarization transmits a horizontal polarization of + 45 ° polarization to a mobile station transmitting a polarization close to the + 45 ° polarization, and a mobile station transmitting a polarization close to the −45 ° polarization to a mobile station transmitting a polarization close to −45 ° polarization. On the other hand, since the −45 ° polarized horizontally polarized wave is transmitted, the mobile station can receive a polarized wave suitable for the attitude of the antenna, and a good reception state can always be obtained. (4) A mobile station transmitting a polarization close to right-hand circular polarization transmits a horizontal right-hand polarization to a mobile station transmitting a polarization close to the right-hand circular polarization, and Since the left-handed circularly polarized horizontally polarized wave is transmitted, the mobile station can receive a polarized wave suitable for the attitude of the antenna, and a good reception state can always be obtained. (5) Transmit the vertically polarized wave on the control channel where the mobile station's antenna attitude is likely to be close to vertical to the ground, and use the horizontal polarization for the communication channel where the antenna attitude is likely to be near horizontal to the earth Since the polarized wave is transmitted, the mobile station can receive a polarized wave suitable for the attitude of the antenna, and a good reception state can be always obtained. (6) Since the received radio waves are analyzed for each time slot and the polarization is switched frequently according to the reception intensity,
The mobile station can always obtain a good reception state even if the antenna is frequently moved to the posture of the antenna.

[Brief description of the drawings]

FIG. 1 is a block diagram of a first embodiment of the present invention.

FIG. 2 is a block diagram illustrating a configuration of a diversity control circuit.

FIG. 3 is a block diagram of a second embodiment of the present invention.

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

FIG. 5 is a block diagram of a fourth embodiment of the present invention.

FIG. 6 is a time chart showing the operation of the sixth embodiment of the present invention.

FIG. 7 is a block diagram of the related art.

FIG. 8 is a block diagram of a conventional technique.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 10 ... Antenna, 10a ... horizontal polarization element, 10b ... vertical polarization element, 11a, 11b ... Tx / demultiplexer, 12 ... Switching device, 13 ... Diversity control circuit, 13a ... Diversity circuit part, 13b ... Switching signal generation part, 14 ... transmitter, 15 ... receiver, 41 ... 90 ° hybrid circuit, 4
2… 90 ° phase shifter

────────────────────────────────────────────────── ───

[Procedure amendment]

[Submission date] December 20, 1996

[Procedure amendment 1]

[Document name to be amended] Statement

[Correction target item name] Claim 5

[Correction method] Change

[Correction contents]

[Procedure amendment 2]

[Document name to be amended] Statement

[Correction target item name] Claim 9

[Correction method] Change

[Correction contents]

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Masayuki Nakano 6, Rokubancho, Chiyoda-ku, Tokyo Japan Mobile Communications Co., Ltd. (72) Toshio Sato 6, Rokubancho, Chiyoda-ku, Tokyo Japan Mobile Communications (72) Inventor Hiroyuki Arai 615-11 Imajuku-Higashicho, Asahi-ku, Yokohama-shi, Kanagawa Prefecture

Claims (10)

[Claims] 1. A plurality of antennas provided in accordance with a polarization system of signal waves to be transmitted and received, and only the strongest signal wave from signal waves received by each antenna is selectively or plural signals A diversity circuit for combining and receiving a wave; a switching circuit for selectively supplying a transmission signal to any of the plurality of antennas; and a signal wave of the transmission signal transmitted from the antenna receiving the strongest signal wave. And a switching control means for controlling the switching circuit. 2. The mobile communication according to claim 1, wherein the diversity circuit and the switching control means share a function of identifying a strongest signal wave from signal waves received by each antenna. Control device. 3. The antenna according to claim 1, wherein at least one of the plurality of antennas is a horizontal polarization antenna, and at least one of the remaining antennas is a vertical polarization antenna. The mobile communication control device according to the above. 4. At least two of said plurality of antennas are at + 45 ° and -45 ° with respect to ground, respectively.
The mobile communication control device according to claim 1 or 2, wherein the mobile communication control device is a dual-polarization antenna that transmits and receives polarized waves that are orthogonal to each other by being tilted only. 5. The antenna according to claim 1, wherein at least two of the plurality of antennas are dual-polarized antennas for transmitting and receiving left-handed polarized waves and left-handed polarized waves.
4. The mobile communication control device according to claim 1. 6. The mobile communication control device according to claim 1, wherein the control of the switching circuit is repeatedly performed at predetermined time intervals. 7. Based on a plurality of antennas provided in accordance with the polarization scheme of a transmitted and received signal wave and identification information of a partner station included in the received signal wave, the partner station can determine whether or not it is good. A polarization mode determination circuit for selecting a polarization mode for obtaining a reception state; a switching circuit for selectively supplying a transmission signal to one of the plurality of antennas; and transmitting a signal wave using the selected polarization mode. And a switching control means for controlling the switching circuit so that a transmission signal is transmitted from an antenna to be controlled. 8. The polarization mode decision circuit selects vertical polarization when the other station is a mobile phone based on the identification information, and selects horizontal polarization when the other station is a mobile phone based on the identification information. The mobile communication control device according to claim 7, wherein a wave is selected. 9. A mobile communication control device for executing a call on a communication channel after setting a call on a control channel, comprising: a plurality of antennas provided according to a polarization system of a signal wave to be transmitted and received; A switching circuit for selectively supplying to any one of the antennas, the switching circuit such that the signal wave of the transmission signal is transmitted from one antenna in a control channel and transmitted from another channel in a communication channel. A mobile communication control device, comprising: switching control means for controlling the communication control. 10. The mobile communication control device according to claim 9, wherein the one antenna is a vertically polarized antenna, and the other antenna is a horizontally polarized antenna.