JP2006191399A - Mobile radio system and line control apparatus - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To set up the necessary number of base stations even when the number of frequencies allocated is small. <P>SOLUTION: Base stations 1 to 3 respectively send radio signals of the same frequency f1 and mobile stations 7, 8 respectively send radio signals of a frequency f2. Areas 4 to 6 are service areas for respective base stations 1 to 3. At the time of no communication, each base station narrows the directivity of a transmission antenna, and while rotating, sends information indicating an idle channel (no communication). When the mobile station 7 existing in the service area 4 performs communication, a line control apparatus 9 judges communication quality between each base station and the mobile station 7, which is sent from the base station to the line control apparatus 9, sends a command to the base station 1 to be communicated to turn the transmission antenna to non-directivity and allow the base station 1 to communicate with the mobile station 7. Each of the other base stations rotates the direction of the transmission antenna so as not to be overlapped to the service area 4 and sends an upward busy signal so as to prevent the generation of a trouble in communication between the base station 1 and the mobile station 7. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a mobile radio system and a line control apparatus, and more particularly to a base station radio apparatus radio apparatus capable of obtaining good communication quality and communicating with a mobile station radio apparatus radio apparatus.

  In the conventional mobile radio system and line control device, for example, as shown in FIG. 5, a plurality of base station radio devices 21 to 23 are arranged in their respective service areas 24 to 24 so as not to generate blank portions where radio signals do not reach. The mobile station radio devices 27 are arranged so as to partially overlap each other and are within the service areas 24-26, so that the mobile station radio device 27 can communicate through any of the base station radio devices 21-23. The base station radio devices 21 to 23 with overlapping service areas are assigned different frequencies f21 to f23 to the transmitted radio signals so that radio signals do not collide in zones with overlapping service areas (hereinafter referred to as crossover zones). ing. The figure shows an example in which the mobile station radio device 27 is in the position closest to the base station radio device 21 (in the service area 24).

  The mobile station radio device 27 transmits a radio signal having a frequency f24, and first makes a location registration request during communication. This request is sent to the channel control device 28 through the received base station radio device 21 to perform location registration, and the channel control device 28 instructs the base station radio device 21 to communicate with the mobile station radio device 27. The Thus, only the base station radio device 21 (frequency f21) is controlled to communicate with the mobile station radio device 27, and other base station radio devices can communicate with other mobile station radio devices. is there.

  Each base station radio device is composed of a continuous transmission system that always sends out radio signals. For example, the mobile station radio device 27 moves during communication, and the reception level of radio signals at the base station radio device 21 decreases. When the communication quality deteriorates, the line control device 28 compares the reception level with the neighboring base station radio device (for example, the base station radio device 22 = frequency f22), and the neighboring base station radio device has the better communication quality. When the mobile station radio device 27 is determined to be good, the location of the mobile station radio device 27 is registered in the line control device 28 through the base station radio device 22, and communication with the mobile station radio device 27 is performed through the base station radio device 22. Switched.

  Such a mobile radio system is used, for example, for fire fighting operations, and a frequency is assigned to each fire department headquarters in each local government. However, if the jurisdiction is wide, a large number of base station radio devices must be provided. It is assumed that sufficient frequency allocation is not possible for the number of radio devices, the frequency of adjacent service areas is the same, radio signals collide in the crossover zone, and mobile station radio device location registration cannot be performed, etc. In some cases, communication problems may occur.

  As similar techniques, for example, JP-A-7-87011 and JP-A-11-178051 are disclosed.

JP-A-62-221230

  The present invention solves the above-described problems, uses a transmitter that can control the directivity of the transmission antenna of the base station radio apparatus, narrows the directivity of the transmission antenna of each base station radio apparatus when there is no communication, and rotates the directivity direction. By controlling the transmission radio signal so that it does not overlap with that from other base station radio devices, the collision of radio signals from the base station radio device in the crossover zone is avoided, and the position of the mobile station radio device An object of the present invention is to make it possible to install as many base station radio apparatuses as necessary even if the allocated frequency is small, without causing any trouble in registration and communication.

  In order to solve the above-described problems, the present invention provides a plurality of base stations that are installed by crossing over a part of each service area, transmit radio signals of the same frequency, and can control the directivity of the radio signals. A base station radio apparatus, a mobile station radio apparatus that communicates via the base station radio apparatus, and a communication between the base station radio apparatus and the mobile station radio apparatus via each base station radio apparatus, A radio network controller for controlling radio signals of the radio device, and when each base station radio device is in channel idle, the directivity of the radio signal of each base station radio device is narrowed, the directivity direction is rotated, and the base A mobile radio system is configured to control so that radio signals do not overlap each other in the crossover region of the station radio apparatus.

  By preventing the mutual radio signals from overlapping each other in the crossover area of the service area of each base station radio apparatus, by providing a time difference in the passage of the radio signal from each base station radio apparatus through the crossover area Achieve.

  A plurality of base station radio devices that are installed by crossing over a part of each service area, transmit radio signals of the same frequency, and can control the directivity of the radio signals, and the base station radio devices A mobile station radio apparatus that performs communication via the base station radio apparatus, a line control apparatus that controls communication with the mobile station radio apparatus via each base station radio apparatus and controls radio signals of the respective base station radio apparatuses; When communication between any one of the plurality of base station radio devices and the mobile station radio device is established, the radio signal from the established base station radio device is controlled to be transmitted omnidirectionally. The radio signal transmitted from another base station radio apparatus that has not established a connection is controlled so as to reduce the directivity and rotate the direction of the directivity and avoid the service area of the base station radio apparatus that has established the connection. Forming the mobile radio system.

  In addition, if there is a mobile station radio device other than the mobile station radio device with which the connection is established within the service area of the base station radio device with which the connection has been established, the mobile device with which the connection is established Transmission by mobile station wireless devices other than the station wireless device is suppressed.

  Also, a plurality of base station radio devices installed by crossing over a part of each service area, each transmitting a radio signal of the same frequency and capable of controlling the directivity of the radio signal, and the base station radio In communication with a mobile station radio device that performs communication via a device, the communication with the mobile station radio device via each base station radio device is controlled, and the directivity of the radio signal of each base station radio device In the line control apparatus that controls the base station radio apparatus, when each base station radio apparatus is in channel idle, the directivity of the radio signal of each base station radio apparatus is narrowed, the directivity direction is rotated, and the crossover region of the base station radio apparatus Thus, a line control device for controlling the radio signal of each base station radio device is configured so that the radio signals do not overlap each other.

  Also in this case, the time difference between the radio signals transmitted from the respective base station radio apparatuses and the crossover areas is set so that the radio signals do not overlap each other in the crossover area of the service area of each base station radio apparatus. This is achieved by providing

  By using the above means, in the mobile radio system and the line control device according to the present invention, a plurality of base station radio devices must be installed, and the radio signals transmitted from each base station radio device have the same frequency. In addition, when there is no communication, the directivity of the transmission antenna of each base station radio device is reduced and the radio signal transmission direction is rotated, so that the radio signals overlap each other in the crossover zone of the service area of each base station radio device. Therefore, even if the same frequency is used in adjacent base station radio devices, radio signal collision does not occur, and even when the allocated frequency is small, the required number of base station radio devices can be provided, and the mobile station The wireless device can be operated without causing any trouble in location registration and communication.

  Control of rotating the transmission direction of the radio signal by narrowing the directivity of the transmission antenna of each base station radio device is performed by the rotation control device. Therefore, the transmission antenna of each base station radio device is rotated in synchronization with the transmission radio. Signals can be prevented from overlapping each other in the crossover zone, which reduces the possibility of radio signals colliding.

  In addition, during communication with the mobile station radio apparatus, only the base station radio apparatus with which communication is performed makes the transmission antenna omnidirectional, so even if the mobile station radio apparatus moves within the service area, communication is not hindered. During this time, other base station radio devices interfere with communication with the mobile station radio device by rotating the direction of the transmitting antenna so that the transmitted radio signal does not reach the service area of the communicating base station radio device. Can be prevented.

  DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, embodiments of the present invention will be described in detail as examples based on the attached drawings.

  FIG. 1 is a principal block diagram showing an embodiment of a mobile radio system and a line control apparatus according to the present invention, which is a diagram at the time of no communication (channel idle). In the figure, 1, 2 and 3 are base station radio apparatuses, 4, 5 and 6 are service areas when radio signals are transmitted from the base station radio apparatus 1, 2 or 3 in an omnidirectional manner, and 7 and 8 are mobile station radio apparatuses. , 9 are line control devices, and A, B, and C are directivity areas when radio signals are transmitted from the base station radio devices 1, 2, or 3 with the directivity narrowed down.

  The line control device 9 controls the directivity of the transmission antennas provided in the base station radio devices 1, 2 and 3, and manages the location of the mobile station radio device requested to register the location, and the base station radio to be communicated with Designate a device to perform communication with a mobile station wireless device.

Next, the operation of the above configuration will be described.
In FIG. 1, base station radio apparatuses 1, 2 and 3 each transmit a radio signal of frequency f1, but mobile station radio apparatuses 7 and 8 are not communicating with either base station radio apparatus 1, 2 or 3. Each base station radio apparatus narrows the directivity of the transmission antenna under the control of the line control apparatus 9, adds "channel idle (no communication)" information to the radio signal, rotates the transmission direction as indicated by an arrow, Send to area 4, 5 or 6. Shaded areas A, B, and C in the figure indicate directivity areas of the transmitting antenna of each base station radio apparatus.

  Then, for example, by starting the rotation of the transmission antenna from the same position (orientation) and rotating in synchronization, the transmission radio signal from each base station radio apparatus is prevented from colliding in the crossover zone. That is, the transmission radio signal from each base station radio apparatus passes through the crossover zone with a time difference. Note that the receiving antenna of each base station radio device is omnidirectional to prepare for reception of radio signals from the mobile station radio device.

  When the mobile station radio apparatus 7 communicates, the mobile station radio apparatus 7 captures radio signals from the base station radio apparatuses 1, 2, and 3, and when the addition of channel idle information is confirmed, the position for communication A registration request (connection request) is transmitted at the frequency f2 together with the identification number of the mobile station wireless device. FIG. 2 is a diagram for explaining the operation at this time. In this case, the distance from the mobile station radio apparatus 7 to the base station radio apparatus is the closest to the base station radio apparatus 1, and then the base station radio apparatus 2 is close to the base station radio apparatus. The station radio device 3 is the farthest.

  Communication information with the mobile station radio apparatus 7 is transmitted from each base station radio apparatus to the line control apparatus 9, and the line control apparatus 9 receives the reception level and line quality at each base station radio apparatus included in the update information. From this situation, it is determined that the communication with the mobile station radio apparatus 7 is optimal to be performed via the base station radio apparatus 1, and the location of the mobile station radio apparatus 7 is registered. Note that the line control device 9 has received at least the transmission antennas of all the base station radio devices from the time when the mobile station radio device 7 first captures a radio signal from any of the base station radio devices and transmits a location registration request. The determination is made after the time required to complete one rotation of the pointing direction has elapsed, that is, after all the radio signals from each base station radio apparatus that can be received by the mobile station radio apparatus 7 have been received.

  Based on the above determination, as shown in FIG. 3, the line control device 9 transmits an activation command to the base station wireless device 1 and simultaneously transmits a BUSY transmission command to the base station wireless devices 2 and 3. The base station radio apparatus 1 makes the transmission antenna non-directional and communicates with the mobile station radio apparatus 7. At this time, since the base station radio apparatus 1 adds the “uplink BUSY” information to the transmission signal (downlink signal) and transmits it, the mobile station radio other than the mobile station radio apparatus 7 in the service area 4 of the base station radio apparatus 1 Transmission of the apparatus (mobile station radio apparatus 8 in the example in the figure) is suppressed. The “uplink BUSY” information is also received by the mobile station wireless device 7, but the mobile station wireless device 7 recognizes that the local station is communicating, so communication is continued without any delay.

  In addition, by transmitting the signal from the mobile station radio device 7 on the downlink signal from the base station radio device 1, the mobile station radio device 8 in the service area 4 can monitor the communication content. In addition, when the mobile communication system is in the two-wave half-reception mode (the base station radio device transmits a radio signal at the time of receiving as well as during transmission, the mobile station radio device transmits only at the time of transmission). If the transmission of the wireless device 7 is stopped, another mobile station wireless device 8 can interrupt and communicate via the base station wireless device 1.

  Receiving the BUSY transmission command from the line control device 9, the base station wireless devices 2 and 3 rotate the direction of the transmitting antenna so that the transmitted wireless signal avoids the service area 4 of the base station wireless device 1, and the “channel BUSY” A radio signal with information added is transmitted. Specifically, by adjusting the transmission output of the signal from each base station radio apparatus, adjustment is made so that the signal does not reach the range of the service area of the base station radio apparatus 1. As a result, when there are mobile station radio devices in the service areas 5 and 6 of the base station radio devices 2 and 3, these mobile station radio devices are suppressed from transmitting radio signals (frequency f2), and the base station radio device 1 So that the communication of the mobile station wireless device 7 via the communication line is not hindered.

  When each base station radio apparatus receives a radio signal from the mobile station radio apparatus 7, it reports the reception level and line quality information to the line control apparatus 9 sequentially. As shown in FIG. 4, the mobile station radio apparatus When the terminal 7 moves into the service area 5 of the base station wireless device 2 while communicating via the base station wireless device 1, the line control device 9 compares the information from each base station wireless device, 7 determines that it has left the service area 4 of the base station radio apparatus 1 and has entered the service area 5 of the base station radio apparatus 2, and transmits an activation command to the base station radio apparatus 2. 3 sends a BUSY send command.

  Thereby, the base station radio apparatus 2 makes the transmitting antenna omnidirectional, enters a state of communicating with the mobile station radio apparatus 7, and takes over the communication performed via the base station radio apparatus 1. The base station radio device 1 that has lost communication narrows the directivity of the transmission antenna, rotates the directivity direction so that the transmitted radio signal does not reach the service area 5, and enters a state of waiting for a radio signal from the mobile station radio device.

  When communication with the mobile station wireless device 7 is completed, the line control device 9 sends a “channel idle” command to all the base station wireless devices, so that each base station wireless device is in an initial state, that is, The directivity of the transmission antenna is reduced, and the state returns to the state of rotating in synchronization so that the transmission radio signals from the base station radio apparatuses do not collide in the crossover zone.

It is a principal part block diagram which shows one Example of the mobile radio | wireless system and line | wire control apparatus by this invention. It is a figure when the connection request | requirement is carried out from the mobile station radio | wireless apparatus. It is a figure when the mobile station radio | wireless apparatus 7 is communicating with the base station radio | wireless apparatus 1. FIG. It is a figure when the mobile station radio | wireless apparatus 7 moves to the service area 5 of the base station radio | wireless apparatus 2, and is communicating. It is a principal part block diagram which shows an example of the conventional mobile radio system and a line control apparatus.

Explanation of symbols

1, 2, 3, 21, 22, 23 Base station wireless device 4, 5, 6, 24, 25, 26 Service area 7, 8, 27 Mobile station wireless device 9, 28 Line controller A, B, C Base station Directional area of transmitting antenna of radio equipment

Claims (6)

A plurality of base station radio devices that are installed by crossing over a part of each service area, transmit radio signals of the same frequency, and can control the directivity of the radio signals, and the base station radio devices A mobile station radio apparatus that performs communication via the base station radio apparatus, a line control apparatus that controls communication with the mobile station radio apparatus via each base station radio apparatus and controls radio signals of the respective base station radio apparatuses; Consists of
When each base station radio apparatus is in a channel idle state, the directivity of the radio signal of each base station radio apparatus is narrowed down and the directivity direction is rotated so that the radio signals do not overlap each other in the crossover region of the base station radio apparatus A mobile radio system characterized in that   By preventing the mutual radio signals from overlapping each other in the crossover area of the service area of each base station radio apparatus, by providing a time difference in the passage of the radio signal from each base station radio apparatus through the crossover area The mobile radio system according to claim 1, wherein the mobile radio system is achieved. A plurality of base station radio devices that are installed by crossing over a part of each service area, transmit radio signals of the same frequency, and can control the directivity of the radio signals, and the base station radio devices A mobile station radio apparatus that performs communication via the base station radio apparatus, a line control apparatus that controls communication with the mobile station radio apparatus via each base station radio apparatus and controls radio signals of the respective base station radio apparatuses; Consists of
When communication between any one of the plurality of base station wireless devices and the mobile station wireless device is established, the wireless signal from the base station with which the connection has been established is controlled to be transmitted omnidirectionally, and the connection is established. A mobile radio system characterized in that radio signals transmitted from other base stations that are not connected are controlled so as to reduce directivity, rotate the directivity direction, and avoid the service area of the base station with which the connection is established.   If there is a mobile station radio device other than the mobile station radio device with which the connection has been established within the service area of the base station radio device with which the connection has been established, the mobile station radio with which the connection has been established 4. The mobile radio system according to claim 3, wherein transmission by a mobile station radio device other than the device is suppressed. A plurality of base station radio devices installed by crossing over a part of each service area, each sending radio signals of the same frequency, and capable of controlling the directivity of the radio signals;
In communication with a mobile station radio apparatus that performs communication via the base station radio apparatus, the communication with the mobile station radio apparatus via each base station radio apparatus is controlled, and the radio of each base station radio apparatus is controlled. In a line control device that controls the directivity of a signal,
When each base station radio apparatus is in a channel idle state, the directivity of the radio signal of each base station radio apparatus is narrowed down and the directivity direction is rotated so that the radio signals do not overlap each other in the crossover region of the base station radio apparatus A line control device for controlling the radio signal of each base station radio device.   By preventing the mutual radio signals from overlapping each other in the crossover area of the service area of each base station radio apparatus, by providing a time difference in the passage of the radio signal from each base station radio apparatus through the crossover area 6. The line control apparatus according to claim 5, which is achieved.