JPH11225105A - Car / mobile phone base station antenna system - Google Patents

Abstract

(57) [Summary] (Modified) [PROBLEMS] To enable distribution of traffic in an automobile / mobile phone antenna system without affecting other sectors. A mobile phone / mobile phone base station recognizes an increase in traffic and an antenna system that rotates based on the means. Here, the plurality of antennas 2 attached to the column 3 have respective directivities, and the antenna system can cover 360 ° in all directions. By rotating the rotation unit 4 on the whole, the area covered by each antenna is changed. Thus, when traffic is concentrated in a certain sector, some of the mobile stations in the sector move to an adjacent sector in the same cell.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an automobile / mobile phone base station, and more particularly to an automobile / mobile phone base station antenna system capable of recognizing the concentration of traffic in one sector and dispersing the traffic as a result.

[0002]

2. Description of the Related Art In a CDMA mobile communication system, when traffic concentrates on a certain sector, the sector radius is reduced by operating the sector boundary line by power control in order to protect the system and secure communication quality, thereby reducing the traffic volume. In addition, for traffic that deviates from the boundary line due to the action, the boundary line of the adjacent sector is operated by power control and the sector radius is widened to accommodate those traffic so that the specific sector is not overloaded. (Dispersed).

[0003]

In the conventional fixed antenna, power control (operation of sector boundaries) of at least two or more sectors adjacent to the own sector is performed by a series of operations as described above. become. These operations must be performed synchronously.

[0004] It is an object of the present invention to provide an antenna capable of distributing traffic without having to take any of these complicated controls and without having to worry about such problems.

[0005]

According to the present invention, the direction of a base station antenna which is originally fixed can be changed, and a sector having a small traffic amount is rotated toward a sector having a large traffic amount to electrically connect the sector with a small traffic amount. The imbalance of traffic volume is improved by physically changing the cell range (arrangement) instead of changing the cell range.

[0006]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings. FIG. 1 is a perspective view of an antenna system for an automobile / mobile phone base station according to the present invention. 1 in FIGS. 1 and 2
Is an automobile / mobile phone antenna main body, 2 is an antenna, 3 is a support, 4 is a rotating unit, 5 is a radio unit, 6 is a control unit, and 7 is a base station. Here, the plurality of antennas 2 attached to the column 3 have respective directivities, and the antenna system can cover 360 ° in all directions. By rotating the rotating unit 4 as a whole,
The area covered by each antenna is variable. Thus, when traffic is concentrated in a certain sector, some of the mobile stations in the sector move to an adjacent sector in the same cell.

FIG. 4 schematically shows the effect. Such an action improves the traffic imbalance. As described above, the conventional antenna that performs traffic distribution by changing the cell (sector) radius requires not only fine power control but also synchronized control via a base station controller. On the other hand, the present invention has an advantage in that traffic is distributed to adjacent sectors in the same cell, so that complicated control as in the related art is not required. The present antenna system is applicable to the entire base station of an automobile / mobile phone system, but is particularly effective in a CDMA base station receiving signals simultaneously in adjacent sectors.

FIG. 2 shows an antenna system in which an antenna 2 covering a specific direction is connected to one support 3. By using a plurality of them, it is possible to cover all directions of 360 °. In such an antenna system, each sector can independently change the coverage area. Therefore, it is possible to reduce the traffic volume of the sector only by rotating the antenna system of the sector where the traffic is concentrated. At this time, some of the mobile stations communicating within the sector have to be handed off to an adjacent sector. At this time, an increase in power is also required, but a sufficient traffic distribution effect can be expected unless the call is disconnected. Also, it is naturally possible to rotate a plurality of antennas simultaneously.

FIG. 3 is a functional block diagram of the antenna system for a car / mobile phone base station according to the present invention as shown in FIGS. In FIG. 3, reference numeral 1 denotes the antenna body described with reference to FIGS. Reference numeral 4 denotes the rotating part. Reference numeral 5 denotes a radio unit, 6 denotes a control unit, and 7 denotes a base station. In the base station 7, the control unit 6 monitors the traffic volume of each sector, and when recognizing the sector where the traffic becomes excessive, gives a control signal to the rotation unit 4 to rotate the antenna and change the coverage area. .

A block diagram of a similar embodiment is shown in FIG.
Shown in 8 is a switch, 9 and 10 are antenna systems. The nine antenna systems and the ten antenna systems are antenna systems that cover all directions of 360 ° with different directivities or different sector divisions.

In the base station 7 as in FIG.
Monitors the amount of traffic in each sector and, when recognizing the sector where the traffic has become excessive, gives a control signal to the switch 8 to switch the antenna system to be used and changes the coverage area.

This system is particularly effective in a CDMA base station which demodulates received signals of adjacent sectors at the same time. Similarly, the same effect can be obtained even in a system in which the cover area of the antenna is changed by controlling a mechanism such as a reflector provided outside.

[0013]

According to the present invention, the imbalance in traffic volume can be improved without breaking the existing cell arrangement at all and without affecting adjacent cells. this is,
C which simultaneously demodulates the received signal of the adjacent sector in the same cell
This is particularly effective in a DMA base station, and has the advantage that technically difficult control such as inter-cell control is not required.

[Brief description of the drawings]

FIG. 1 is a perspective view of an automobile / mobile phone base station antenna system according to an embodiment of the present invention.

FIG. 2 is a perspective view of an automobile / mobile phone base station antenna system according to an embodiment of the present invention.

FIG. 3 is a functional block diagram of an automobile / mobile phone antenna system according to an embodiment of the present invention.

FIG. 4 is a schematic view showing the effect of the present invention.

FIG. 5 is a functional block diagram of an automobile / mobile phone antenna system according to an embodiment of the present invention.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Car / mobile phone base station antenna main body, 2 ... Antenna, 3 ... Post, 4 ... Rotating part, 5
... Radio unit, 6 ... Control unit, 7 ... Base station,
8 switches, 9, 10 antennas.

Claims (9)

[Claims] 1. An antenna device for a base station of a car / mobile phone, wherein a fulcrum or a base of a pillar to which an antenna capable of covering 360 degrees in all directions is connected can be rotated. Car / mobile phone base station antenna system. 2. An automobile / cellular phone base station antenna device, wherein a fulcrum to a support to which an antenna capable of covering a characteristic direction is connected or a base of the support can be rotated. Mobile phone base station antenna system. 3. An antenna system for an automobile / mobile phone base station, wherein the antenna apparatus has a reflector and can rotate the reflector. 4. An antenna system for a mobile / mobile phone base station in a base station antenna system for a mobile / mobile phone having the function according to claim 1, wherein the sector coverage can be changed. 5. An automobile / mobile phone base station antenna system having a function according to claim 2, wherein the sector coverage can be changed by rotating each antenna. Station antenna system. 6. An automobile / mobile phone base station antenna system according to claim 3, wherein the sector coverage can be changed by rotating a reflector. Antenna system. 7. An automobile / mobile phone base station antenna system, wherein a plurality of antennas having different directivities can be switched by a switch. 8. An automobile / mobile phone base station antenna system having a function according to claim 7, wherein a sector coverage can be changed. system. 9. An automobile / cellular phone base station antenna system wherein the directivity of the antenna can be changed by using a movable external mechanism component.
Mobile phone base station antenna system.