JP3034251B1 - Mobile communication device - Google Patents

Abstract

An object of the present invention is to provide a mobile communication device capable of directing a beam of an array antenna to a mobile terminal at a higher speed and more reliably than a conventional technology. SOLUTION: A fixed propagation information including a map, terrain information, and building information in a service area covered by a base station 100 is stored in a fixed propagation information database memory 21, and the fixed propagation information stored in the fixed propagation information database memory 21 is stored. Based on the above, when performing communication with a mobile terminal, an optimum weighting factor for combining a desired wave and suppressing an unnecessary wave is calculated for each position of a predetermined unit in the service area, and the propagation characteristic is calculated. It is stored in the parameter database memory 22. The propagation characteristic setting processing unit 20
When performing communication with the transceiver 10, the weight coefficient is read from the propagation characteristic parameter database memory 22 based on the detected position detection data of the PHS telephone 50, and
Set to -1 to 10-3.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a mobile communication device applied to a mobile communication system such as a mobile phone system.

[0002]

2. Description of the Related Art For example, prior art document 1 "Masamoto Matsumoto et al.
"Adaptive Array Antenna for Mobile Communication-Technology Survey and Outlook-", NTT DoCoMo Technical Journal, Vol. 5, No. 4, pp. 25-36 "discloses a technology of an adaptive array antenna for mobile communication. This document describes a space-time equalization technique in addition to an adaptive array antenna for receiving an uplink signal and an adaptive array antenna for transmitting a downlink signal. Here, in the signal processing of the adaptive array, the weighting coefficient for each transmitting and receiving antenna element is statistically processed on the assumption that the position of the mobile terminal is indefinite and the propagation characteristics are not known. Discloses a method of calculating by using. This document also lists various algorithms that can be applied in an adaptive array.

[0003] In addition, prior art document 2 “Special issue on
“Smart Antennas”, IEEE Personal Communications, Vo
l.5, No. 1, Feb. 1998, describe various mobile communication antennas.

[0004]

However, although all of the documents provide an overview of adaptive antennas for mobile communication, the prior art adaptive antennas are based on the premise that propagation characteristics can be understood only statistically. In addition, a method of extracting a signal having a characteristic like a desired wave from a received signal by signal processing has been adopted. For this reason, it is necessary to spend time optimizing, and the optimal value is required to include the uncertainty of incoming radio wave information in addition to the approximate calculation at the time of optimization. It had given the limits of quality.

An object of the present invention is to solve the above-mentioned problems and to provide a mobile communication device capable of directing a beam of an array antenna to a mobile terminal at a higher speed and more reliably than the prior art. is there.

[0006]

A mobile communication apparatus according to the present invention synthesizes a desired wave by multiplying a transmission / reception signal transmitted / received by a plurality of antenna elements of an array antenna by a predetermined weighting factor. In a mobile communication device having a transceiver for suppressing unnecessary waves and communicating with a mobile terminal, a detecting means for detecting the position of the mobile terminal, a map and terrain information in a service area covered by the mobile communication device, a building A first storage device that stores fixed propagation information including information, and a desired wave combined and unnecessary wave when communicating with a mobile terminal based on the fixed propagation information stored in the first storage device. A first processing means for calculating an optimal weighting factor for suppressing each of the predetermined unit positions in the service area, and a weighting factor calculated by the first processing means. When performing communication with the second storage device and the mobile terminal, a second coefficient for reading a weight coefficient from the second storage device and setting the weight coefficient in the transceiver based on the position detected by the detection means. And processing means.

Preferably, in the mobile communication device, when performing communication with the mobile terminal, an optimal multiplication coefficient is calculated by adaptively controlling the multiplication coefficient so that the strength of a received signal is maximized. Further, a learning means for learning by updating the multiplication coefficient stored in the second storage device is further provided.

Further, in the mobile communication device, preferably, an optimum multiplication coefficient is calculated in consideration of the position of the moving object at the current time, and the multiplication coefficient stored in the second storage device is set. And a third processing unit.

[0009]

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 shows an embodiment of the present invention.
FIG. 2 is a block diagram illustrating a configuration of a mobile communication system. This fruit
In the embodiment, the mobile communication system using the PHS telephone 50 is used.
An example of a system will be described. This mobile communication system
Station 100, a radio control station 300 connected thereto,
It comprises a PHS telephone 50 as a mobile terminal. Book
The mobile communication system according to the embodiment includes a plurality of array antennas.
Specified for transmitted and received signals transmitted and received by antenna elements
Weighting factor w_1a, W_2a, W_3a, W_1b, W_2b, W _3bMultiply by
By combining the desired wave and suppressing the unnecessary wave
PHS telephone 5 including transceivers 10-1 to 10-3
0 in the mobile communication device of the base station 100 that communicates with
As compared with the prior art, in particular, the propagation characteristic setting processing unit 2
0 is provided. Here, (a) the base
Map and terrain within the service area covered by station 100
Fixed propagation information including information and building information
(B) fixed propagation information data
Based on the fixed propagation information stored in the base memory 21.
Therefore, when communicating with the mobile terminal, a desired wave is synthesized and
The optimum weighting factor for suppressing unnecessary waves is
Calculation for each position of a predetermined unit in the
Stored in the parameter database memory 22;
The transport characteristic setting processing unit 20 communicates with the PHS telephone 50.
At the time, the detected position detection data of the PHS telephone 50 is
Based on the propagation characteristics parameter database memory
22 to the weighting factor w_1a, W_2a, W_3a, W_1b, W_2b, W_3b
Is read and set in the transceivers 10-1 to 10-3.
You.

Referring to FIG. 1, a radio control station 300 includes a radio control station control device 301 and a location registration memory 302 connected thereto.
1 is connected to a plurality of base stations 100, for example, while being connected to a public telephone network 500. Here, the radio control station controller 301 is provided with a telephone exchange, and connects the outgoing call of the PHS telephone 50 received by the base station 100 to the public telephone network 500 while connecting the incoming call from the public telephone network 500 to the location. A line is connected to the PHS telephone 50 via the base station 100 closest to the position of the PHS telephone 50 to be received and stored in the registration memory 302. Here, when the PHS telephone 50 is turned on, the radio control station controller 30
1 is based on the communication between the plurality of base stations 100 and the PHS telephone 50,
The current position detection data (for example, latitude and longitude) of the PHS telephone 50 is calculated from the electric field strength of the transmission signal from the HS telephone 50, and stored in the position registration memory 302 for each PHS telephone 50 as needed. With the current technology, the position detection error is about 3 m (Prior Art Document 3, "Tatsumi Yanagawa et al.," A study on detection accuracy in position detection method using reception level "," IEICE General Conference, 1998. , B-5-31, March 1998 "). The position detection data stored in the position registration memory 302 is transmitted through the control data communication device 15 of the base station 100 when requested by the propagation characteristic setting processing unit 20 of the base station 100.
It is transmitted to propagation characteristic setting processing section 20.

In the present embodiment, the position detection in the PHS telephone system is used. However, the present invention is not limited to this, and the position may be detected and registered using a digital GPS device. In this case, the position detection accuracy is about 3 cm (see, for example, prior art document 4, "Namie Hiromune et al.," R using digital MCA radio for data transmission.
TK-GPS positioning ", 1998 IEICE General Conference, B-2-3, March 1998". ).

A telephone signal from the public telephone network 500 is input to the data modulator 11 of the base station 100 via the radio control station controller 301, while a telephone signal output from the data demodulator 14 is transmitted to the radio control station. It is transmitted to the public telephone network 500 via the control device 301.

In base station 100, array antenna 1
Numeral 01 denotes, for example, a linear array antenna, for example, in which three antenna elements 1-1 to 1-3 are, for example, １ ／
They are arranged on a straight line close to each other at wavelength intervals. The data modulator 11 modulates a predetermined intermediate frequency signal (hereinafter, referred to as an IF signal) according to a predetermined modulation method in accordance with an input telephone signal, and transmits and receives the modulated IF signal via the distributor 12 to each of the transmission / reception. Output to the multipliers 4-1 to 4-3 of the devices 10-1 to 10-3.

The transceiver 10-1 has a circulator 2-
1; a transmitter 3-1; multipliers 4-1 and 5-1; and a receiver 6-1.
The antenna element 1-1 of the array antenna 101 is connected to -1. Multiplication coefficients w _1a and w of multipliers 4-1 and 5-1
_1b is determined and set by the propagation characteristic setting processing unit 20, and is controlled. The transmitter 3-1 includes an up-converter that frequency-converts the IF signal output from the multiplier 4-1 into a frequency of the transmission signal, and a power amplifier that power-amplifies the transmission signal, and circulates the power-amplified transmission signal. The signal is output to the antenna element 1-1 via the 2-1 and radiated toward the PHS telephone 50. On the other hand, the antenna element 1-1
The received signal received by the circulator 2-1
Is input to the receiver 6-1 via the. The receiver 6-1 includes:
A high-frequency low-noise amplifier, a down-converter for converting the frequency of a received signal to an intermediate frequency of an IF signal, and an intermediate-frequency amplifier for amplifying the IF signal are provided. And outputs it to the adder 13.

The transceiver 10-2 includes a circulator 2-
2, a transmitter 3-2, multipliers 4-2 and 5-2, and a receiver 6-2, and is configured similarly to the transceiver 10-1, and the circulator 2-2 includes an array antenna 101.
Are connected. Also, the transceiver 1
0-3 is a circulator 2-3, a transmitter 3-3,
It has multipliers 4-3 and 5-3 and a receiver 6-3, and is configured similarly to the transceiver 10-1, and the circulator 2-3 is connected to the antenna element 1-3 of the array antenna 101. .

The adder 13 adds the three input IF signals and outputs the added IF signal to the data demodulator 14. In response, the data demodulator 14 demodulates the input IF signal into the original telephone signal and transmits the demodulated IF signal to the public telephone network 500 via the radio network controller 301.

For example, base station 1 installed in building 211
10 is provided with a base station antenna 110a,
00 is connected. In the propagation example shown in FIG. 1, the transmission signal radiated from the antenna 50a of the PHS telephone 50 carried by the operator 51 is, for example, a direct wave in the base station 110.
Is propagated to and received by the base station antenna 110a,
The direct wave propagates and is received by the antenna element 102 of the base station 100, is reflected by the building 201 and is propagated and received by the antenna element 1-1 and the like, and is reflected by the train 203 and is received by the train 203. 2 and the like.
3 and received.

The propagation characteristic setting processing section 20 is connected to a timer 23 for measuring the current time, a fixed propagation information database memory 21, a propagation characteristic parameter database memory 22, and the control data communication device 15. Here, the fixed propagation information database memory 21 stores a map and terrain information in a service area covered by the base station 100, a building database including building positions and wall surfaces,
Electric constants of walls and ground, I related to driving control of the automobile 202
Position information from a TS (Intelligent Transportation System) system, travel information of train 203 (time and travel position), type and direction of array antenna 101, base station 1
Fixed propagation information data including the transmission / reception frequency of 00 and the like are stored in advance. As shown in the following table, when the PHS telephone 50 is located at each position (latitude and longitude) in the base station 100, the propagation characteristic parameter database memory 22 optimally arranges the PHS telephone 50. Multiplier 4 for the direction to steer the beam of antenna 101
The respective multiplication coefficients w _1a , w _2a , w _3a and w _1b , w _2b , w _{3b of} -1 to 4-3 and 5-1 to 5-3 are the base station 1
It is stored in advance for each position data of a predetermined unit in 00.

[0020]

[Table 1] ―――――――――――――――――――――――――――――――― Position data (latitude and longitude) w _1a , w _2a , W _3a , w _1b , w _2b , w _3b ―――――――――――――――――――――――――――――――― ………… ………………… ――――――――――――――――――――――――――――――――――――

By the way, Prior Art Document 5, "Tokuo Abe et al.," Creation of Spatio-Temporal Channel Model Using Ray Trace Method ", IEICE Technical Report, A. P197, R
CS97-235, NW97-180, 1998 2
In the `` moon, '' by inputting information such as the building database, electrical constants such as walls and ground, the type and orientation of the antenna, and frequency, propagation using the ray tracing method, which was mainly used for estimating the average electric field, etc. Route search,
Disclosed is software that can calculate signal levels, flat fading, delay profiles, angle delay profiles, and the like.

The propagation characteristic setting processing unit 20 of the present embodiment
For example, using a known method such as this software program, based on the fixed propagation information data in the fixed propagation information database memory 21 in advance, the arrival direction of the transmission signal from each position shown in Table 1 and its intensity, phase, and reflection. The direction of arrival and the time difference of interference waves such as waves are calculated in advance, and then, based on these calculated data, optimal multiplication is performed such that only the desired wave of the multipath waves is combined to suppress unnecessary waves. The coefficients w _1a , w _2a , w _3a , w _1b , w _2b , w _3b are calculated and stored in the propagation characteristic parameter database memory 22 in advance. Therefore, when there is an outgoing / incoming call of the PHS telephone 50, the corresponding PH is sent to the radio control station controller 301.
Requests position detection data S phone 50, based on the position detection data sent in response to this, Table 1 of the multiplication from the table the coefficient w _1a of propagation characteristic parameter database memory 22, w _2a, w _3a, w _1b , w _2b , w _3b are read out, and each of the multipliers 4-1 to 4-3 and 5-1 to 5-
Set to 3.

Therefore, the PHS telephone 50 and the base station 100
In mobile communication with, transmission and reception signals are weighted using optimal multiplication coefficients based on actual fixed propagation information data, rather than so-called stochastic propagation path estimation. As a result, the error rate characteristics at the time of signal extraction are greatly improved, and high-speed and high-quality communication can be provided.

Further, the propagation characteristic setting processing unit 20
During actual call communication between the telephone 50 and the base station 100, optimal multiplication is performed by adaptively controlling the multiplication coefficient so that the strength of the received signal is maximized in accordance with each detection position of the PHS telephone 50. The learning may be performed by calculating the coefficient and updating the multiplication coefficient data in the propagation characteristic parameter database memory 22. Further, the propagation characteristic setting processing unit 20 obtains the current time from the timer 23, and considers the traveling position of the moving object such as the train 203 or the car 202 at the current time, and transmits the transmission signal from each position shown in Table 1. The direction of arrival and its intensity and phase, the direction of arrival of an interference wave such as a reflected wave, and the time difference are calculated, and based on the calculated data, optimal multiplication coefficients w _1a , w _2a , w _3a ,
w _1b, w _2b, may be calculated the w _3b. Through these learning and calculation, a multiplication coefficient more suitable for actual propagation can be calculated, and further, the error rate characteristic at the time of signal extraction is improved, and high-speed and high-quality communication can be provided.

In the above embodiment, the data of the fixed propagation information database memory 21 is stored in advance. However, the present invention is not limited to this. Whenever possible, for example, a known ITS (Intelligent Transportation System)
And GIS (Geographic Informa), a map information system
may be downloaded and stored from the respective databases of the Action System) via a communication network such as the Internet.

In the above embodiment, the propagation characteristic setting processing unit 20, the fixed propagation information database memory 21 and the propagation characteristic parameter database memory 22
However, the present invention is not limited to this, and may be provided at a location such as the radio control station 300 or another central monitoring station.

[0027]

As described above in detail, according to the present invention, by multiplying a transmission / reception signal transmitted / received by a plurality of antenna elements of an array antenna by a predetermined weighting factor,
Equipped with a transceiver that combines the desired wave and suppresses unnecessary waves,
In a mobile communication device for communicating with a mobile terminal, a detecting means for detecting a position of the mobile terminal, and a fixed propagation information including a map, terrain information, and building information in a service area covered by the mobile communication device are stored. An optimal weighting factor for synthesizing a desired wave and suppressing an unnecessary wave when performing communication with a mobile terminal based on the fixed propagation information stored in the first storage device and the first storage device. A first processing unit that calculates for each position of a predetermined unit in the service area, a second storage device that stores a weight coefficient calculated by the first processing unit, and communication with the mobile terminal. A second processing unit that reads a weight coefficient from the second storage device based on the position detected by the detection unit and sets the weight coefficient in the transceiver. Therefore, in mobile communication between the mobile terminal and the mobile communication device, weighting of transmission / reception signals is performed by using an optimal multiplication coefficient based on actual fixed propagation information data instead of so-called stochastic propagation path estimation. Therefore, the error rate characteristic at the time of signal extraction is significantly improved as compared with the related art, and high-speed and high-quality communication can be provided.

Preferably, in the mobile communication device, when performing communication with the mobile terminal, an optimal multiplication coefficient is calculated by adaptively controlling the multiplication coefficient so that the strength of a received signal is maximized. And a learning means for learning by updating the multiplication coefficient stored in the second storage device. Therefore, since the adaptive control is further performed according to the current situation, the error rate characteristic at the time of signal extraction is further greatly improved, and high-speed and high-quality communication can be provided.

Further, in the mobile communication device, preferably, an optimum multiplication coefficient is calculated in consideration of the position of the moving object at the current time, and the multiplication coefficient stored in the second storage device is set. And a third processing unit for performing the processing. Therefore, since the adaptive control is further performed according to the current situation, the error rate characteristic at the time of signal extraction is further greatly improved, and high-speed and high-quality communication can be provided.

[Brief description of the drawings]

FIG. 1 is a block diagram illustrating a configuration of a mobile communication system according to an embodiment of the present invention.

[Explanation of symbols]

 1-1 to 1-3: antenna element, 2-1 to 2-3: circulator, 3-1 to 3-3: transmitter, 4-1 to 4-3, 5-1 to 5-3: multiplier 6-1 to 6-3: receiver, 11: data modulator, 12: distributor, 13: adder, 14: data demodulator, 15: control data communication device, 20: propagation characteristic setting processing unit, 21 ... fixed propagation information database memory, 22 ... propagation characteristic parameter database memory, 23 ... timer, 50 ... PHS telephone, 50a ... antenna, 51 ... operator, 100 ... base station, 101 ... array antenna, 110 ... base station, 110a ... Base station antennas, 201, 211: building, 202: automobile, 300: radio control station, 301: radio control station controller, 302: location registration memory, 500: public telephone network.

Continuing from the front page (72) Inventor Takashi Inoue 5 Sanraya, Inaya, Koza-cho, Soraku-cho, Kyoto Prefecture Within ATI Environmental Protection Communication Research Laboratories (72) Inventor Yoshiyuki Fujino, Seika-cho, Soraku-gun, Kyoto Prefecture Large character Inaniya Small character No. 5 Sanhiradani Inside ATR Environmental Adaptive Communications Research Laboratories (56) References JP-A-11-215044 (JP, A) JP-A-9-214421 (JP, A) Field surveyed (Int.Cl. ⁷ , DB name) H04B ⁷ /02-7/12 H01Q 21/00-21/30 H04B ^7/ 24-7/26 H04Q ⁷ /00-7/38

Claims (3)

(57) [Claims] 1. A mobile terminal, comprising: a transmitter / receiver for multiplying a transmission / reception signal transmitted / received by a plurality of antenna elements of an array antenna by a predetermined weighting coefficient to synthesize a desired wave and suppress an unnecessary wave; Detecting means for detecting the position of a mobile terminal, and first storage for storing fixed propagation information including map, terrain information, and building information in a service area covered by the mobile communication device. An apparatus and, based on the fixed propagation information stored in the first storage device, when communicating with a mobile terminal, an optimum weighting factor for synthesizing a desired wave and suppressing unnecessary waves, A first processing unit that calculates for each position of a predetermined unit in the area; a second storage device that stores a weighting factor calculated by the first processing unit; And a second processing means for reading a weight coefficient from the second storage device based on the position detected by the detection means and setting the weight coefficient in the transceiver. apparatus. 2. When performing communication with the mobile terminal, adaptively controlling the multiplication coefficient so as to maximize the strength of a received signal, thereby calculating an optimal multiplication coefficient,
The mobile communication device according to claim 1, further comprising learning means for learning by updating the multiplication coefficient stored in the storage device. A third processing unit that calculates an optimum multiplication coefficient in consideration of the position of the moving object at the current time and sets the multiplication coefficient stored in the second storage device; 3. The mobile communication device according to claim 1, wherein: