JPH0322632A - Load distributing system for radio base station - Google Patents

Abstract

PURPOSE:To attain load distribution even to a call during talking regardless of origination by providing plural directional antennas and a directional antenna controller having a function controlling a transmission output sent from the directional antenna on plural radio base stations. CONSTITUTION:When the load state monitoring controller of an automobile telephone exchange 6 detects the overload of a radio base station 12 and detects radio base stations 8, 9, 11 having a sufficient margin, since the radio base station 12 reduces the cover area, a control signal decreasing the transmission output is sent and the radio base stations 8, 9, 11 expand the cover area in the direction of the radio base station 12, on of directional antennas is designated and the control signal is sent to increase the transmission output. Thus, the automobile telephone set during communication in the coverage of the radio base station 12 easily detects the deterioration in the reception state of a radio wave and the loading state of the entire system is averaged.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a load balancing method for a wireless base station, and particularly to a load balancing method for a wireless base station in a cellular car phone system. [Prior Art] In the conventional wireless base station load balancing method, when a mobile phone terminal makes a call and the communication channel of the wireless base station that first detects the call is overloaded, the communication channel of the adjacent wireless base station is The connection was made via a trunk. [Problem to be solved by the invention] Specified by the car telephone exchange [Problem to be solved by the invention] The conventional load balancing method of the wireless base station described above only performs load balancing when a car phone terminal makes a call; The problem is that load balancing cannot be performed for calls. An object of the present invention is to provide a wireless base station with a directional antenna,
A car telephone exchange has a monitoring function for monitoring the load status of a plurality of wireless base stations, and a control function for controlling the transmission output of a specific directional antenna of the plurality of wireless base stations to be changed based on the monitoring result of this monitoring function. The object of the present invention is to provide a load distribution method for a wireless base station that can perform load distribution not only for outgoing calls but also for calls in progress by providing a load status monitoring and control device with the present invention. [Means for Solving the Problems] The wireless base station load balancing method of the present invention provides a cellular car phone system in which a plurality of directional antennas and transmission outputs transmitted from the directional antennas are distributed to a plurality of wireless base stations. A directional antenna control device having a control function is provided, and the mobile phone exchange has a monitoring function for monitoring the load status of the plurality of wireless base stations, and a specific control device for the plurality of wireless base stations based on the monitoring result of this monitoring function. This configuration includes a load condition monitoring control device having a control signal sending function for sending a control signal to the directional antenna control device so as to change the transmission output of the directional antenna. [Example] Next, an example of the present invention will be described with reference to the drawings. FIG. 1 is a block diagram of an embodiment of the present invention. The radio base station 1 is provided with directional antennas 2, 3.4, and a directional antenna control device 5 that can individually control the transmission output transmitted from each of the directional antennas 2.3.4. ．． The car telephone exchange 6 has a plurality of wireless base stations 1
A monitoring function that monitors the load condition of
．． A load condition monitoring control device 7 is provided which has a control signal sending function for sending a control signal to the directional antenna control device 5 so as to change the transmission outputs of antennas 3 and 4. Next, we will explain the operation. FIG. 2 is an explanatory diagram for explaining the operation of controlling the directional antenna M of the present invention. The car telephone exchange 6 has wireless base stations 8, 9, 10, 11.
．． It is connected to 12. The car telephone exchange 6 and the radio base stations 8, 9, 10, 11.12 are not shown in FIG. .4 and a directional antenna control device 5. Now, the load condition monitoring control device 7 of the car telephone exchange 6
Assume that an overload state of wireless base station l2 is detected. Therefore, the load state monitoring and control device 7 monitors the load states of the radio base stations 8, 9, 10, and l1 adjacent to the radio base station l2, and detects the radio base stations 8, 9, and 11 that still have sufficient margin. do. Next, the load state monitoring and control device 7
2, in order to reduce the coverage area, a control signal is sent to lower the transmission output, and at the same time, the wireless base stations 8, 9, 1l
In order to expand the coverage area in the direction of the wireless base station 12, a control signal is sent to specify one of the directional antennas 2, 3.4 and increase the transmission output. However, since no particular control signal is sent to the wireless base station 10, the size of the coverage area does not change. Each directional antenna control device 5 of the wireless base station 8, 9, 11 that received the control signal,
Increase the transmission power for a specific directional antenna according to the received control signal. By doing this, it becomes easier for a car phone terminal that is talking in the coverage area of the wireless base station 12 to detect deterioration in the reception condition of radio waves, and other adjacent wireless base stations 8, 9.1
The number of calls that are reconnected to 1 will increase, and the load state of the entire system will be averaged out.

〔Effect of the invention〕

As explained above, the present invention provides a wireless base station with a directional antenna, a mobile phone exchange with a monitoring function for monitoring the load status of a plurality of wireless base stations, and a mobile phone exchange that receives the monitoring results of the monitoring function and then monitors the load status of a plurality of wireless base stations. By providing a load status monitoring and control device with a control function that controls the transmission output of a specific directional antenna of a station to change, it is possible to perform load distribution not only for outgoing calls but also for calls in progress. It is effective.

[Brief explanation of the drawing]

FIG. 1 is a block diagram of an embodiment of the present invention, and FIG. 2 is an explanatory diagram for explaining the directional antenna control operation of the present invention. 1, 8, 9, 10, 11.12... Radio base station, 2, 3.4... Directional antenna, 5...
... Directional antenna control device, 6 ... Car telephone exchange, 7 ... Load condition monitoring control device.

Claims (1)

[Claims] In a cellular car telephone system, a plurality of wireless base stations are provided with a plurality of directional antennas and a directional antenna control device having a function of controlling the transmission output transmitted from the directional antennas, and a car telephone exchange is provided with a plurality of directional antennas. a monitoring function for monitoring the load state of a wireless base station; and a control signal being sent to the directional antenna control device to change the transmission output of a specific directional antenna of the plurality of wireless base stations in response to the monitoring result of this monitoring function. 1. A load distribution system for a wireless base station, comprising: a load condition monitoring and control device having a control signal sending function.