JP2008022318A - Private phs system - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a private PHS system which reduces a processing load on a main control unit. <P>SOLUTION: The main control unit 1 accumulates messages for a call control task. The accumulation amount decreases through processing of the call control task 10c. When sent messages to be received are too many and exceeds a prescribed threshold P3, however, it becomes difficult to perform the processing. For Then, whether there is a message accumulation amount P1 exceeding the prescribed threshold P3 is monitored, and when it exceeds the threshold P3, a predetermined wireless base station is turned OFF. When the accumulation amount P1 decreases down to a prescribed threshold P2 being less than P3, or less, the wireless base station is turned ON again. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a local PHS system, and more particularly to a local PHS system related to fail-safe when a call processing load increases.

  The private PHS system has a plurality of wireless base stations to cover a predetermined wireless area, and PHS terminals in the wireless area communicate with each other through the wireless base station, and furthermore, a private branch exchange (PBX) and the like It can be connected to a general public line via the telephone and serves to replace a telephone line in an office or office building.

The following is a conventional example of a conventional local PHS system.
Japanese Patent Laid-Open No. 11-187464 JP-A-2005-1557577 JP-A-11-331909

  In Patent Document 1, even when a PHS terminal moves from an area of a private PHS system to the outside, incoming connection is made through a public PHS network. Patent Document 2 intends to distribute the update processing load such as correction of a problem of a program after system operation at a radio base station in an area, addition of a function, and performance improvement. Patent Document 3 discloses an implementation example of a standard RCR-STD-28 of a radio wave system development center (RCR), which is a communication standard between a mobile station and an exchange.

  The private PHS system has a control device (hereinafter also referred to as a main control device) in order to realize various controls and functional processes in addition to a plurality of radio base stations. This main control unit is connected to a plurality of radio base stations, performs communication control for calling and calling with PHS, an exchange function for forming a call path, a PHS periodic position holding (registration) function, and an individual Performs group calls and broadcast notification functions as special processing other than calls.

  Here, the group call refers to a function that allows up to N (for example, 32) group members to call a conference call from the PHS, and the broadcast notification refers to the PHS display screen (LCD) of all broadcast notification groups. The function of displaying a message on the screen, and the regular position holding (registration) refers to a function in which the PHS periodically notifies the main controller of its own position (wireless area and its own position x, y).

  The processing load of the main control device has an adverse effect on the call capability. If the processing load exceeds the processing capability, the call cannot be made, and in the worst case, the system may be down.

Further details will be described.
The main cause of the increase in the processing load of the main control device is congestion. This congestion refers to a state where it is difficult to make a call due to an overload of a large number of call processing requests. For example, if a large number of request messages such as group calls, broadcast notifications, and periodic location registration requests from the PHS that are to be processed by the main control device overlap, the main control device cannot process the message, and the PHS A response to the location registration request cannot be returned in time. As a result, a retry location registration request is transmitted from the PHS, and a load is further applied. Furthermore, system down itself may occur.

  An object of the present invention is to provide a local PHS system that can reduce the processing load of a main control device.

The present invention includes a plurality of radio base stations for relaying PHS, a control device connected to the plurality of radio base stations and receiving and processing messages from the PHS, and a part of the radio base stations. Power supply ON / OFF switch means to the base station,
The above control device receives a message related to call control obtained through a radio base station, stores it in a mailbox, performs message processing, checks the amount of message stored in the mailbox, A private PHS system is disclosed in which the power supply ON / OFF switch to some of the radio base stations is switched to OFF when the accumulated amount is large.

  According to the present invention, the amount of stored call control messages as the processing load of the main control device is monitored, and if the processing load exceeds a specified value, some radio base stations are turned off (power is cut off). Thus, the radio base station is disconnected, thereby reducing the processing load on the main controller.

  FIG. 1 is a configuration example diagram of a local PHS system of the present invention. This system has a main controller 1, a plurality of radio base stations (BS) 2, a PHS 3 as a radio terminal, a PHS position display terminal 4, a telephone 5, and a maintenance console 6. Here, the PHS 3 is a portable terminal for each person that may be used within the area of the system but may be used outside the area of the system.

  The plurality of radio base stations 2 may have a scale ranging from several tens to several hundreds, and the effective radio communication areas are all narrow. And it acts as a radio relay means for the PHS in its own effective radio communication area.

  The main control device 1 includes a communication control function including a call to the PHS 3, a switching function for forming a call path, a PHS position information holding function (for determining which base station the PHS is under), a radio base It has processing functions such as station power supply control functions. Further, it has a group telephone call, broadcast notification control function, etc., which are unique processing as a local PHS system.

The PHS position display terminal 4 performs PHS position display based on the above functions, the telephone 5 is various contact means with the outside, and the maintenance console 6 is an operation means for maintenance and inspection.
The main controller 1 is a kind of computer system having a built-in program, and FIG. 2 shows a configuration diagram including this program example. In FIG. 2, the main controller 1 has a program 10, which is an IF reception task 10a, a call control task 10c, a power supply ON / OFF control task 10d, an IF transmission task 10e, an exchange task 10f, and a BS periodic check. Task 10g, IF periodic confirmation task 10h,... The call control task mailbox 10b stores a call control message, which is a message processing target.

  The main controller 1 and the radio base station 2 are connected by an interface board (BSIF) 7, and a power supply control line 11 is provided so that the radio base station 2 can be turned on or off by an ON or OFF command from the main controller 1. In this configuration, the power is cut off.

  The program 10 has a reception function by the IF reception task 10a, a transmission function by the IF transmission task 10e, a call control and communication control with the PHS which is the main process of the call control task 10c, a position information holding function, a path formation function by the exchange task 10f, The power supply control function of the wireless base station 2 by the power supply ON / OFF control task 10d, and the BS regular confirmation function and the IF regular confirmation function by the tasks 10g and 10h are fulfilled.

  In the program 10, the call control task 10c is a part that mainly performs call control and communication control with the PHS and PHS position holding registration, and causes an increase in processing load due to an increase in the number of PHS. The IF reception task 10a receives a message from the base station 2, determines the contents of the message, and transmits a task-related message to each of the other tasks 10c, 10f to 10h except the transmission task 10e according to the result. To do. For example, a message associated with a call is temporarily stored in the mailbox 10b for the task 10c, a response message for the base station status monitoring message is transmitted to the task 10g, and a response message for the IF board status monitoring message is transmitted to the task 10h. However, among the messages related to the tasks 10c, 10f to 10h, the message transmitted to the call control task 10c via the mailbox 10b occupies a large capacity. Therefore, the IF reception task 10a checks the availability of the mailbox 10b and monitors whether the availability is below a specified threshold value. When the free space becomes smaller than the threshold value, the reception task 10a activates the power supply ON / OFF control task 10d and sends a message to the BSIF 7 to turn off the corresponding radio base station 3. In response to this, the BSIF 7 sends an OFF command to the corresponding radio base station 3 through the control line 11 according to its own program, and turns off the power supply of the corresponding radio base station (so-called fail-safe function). Note that the transmission path from the exchange task 10f to the mailbox 10b is shown in FIG. 1, but this is because when the PHS call is made, the other party disconnects when sending an incoming call request to the call control task 10c or during a call. This is a route for transmitting a disconnection request to the call partner to the call control task 10c.

The power supply OFF of the radio base station will be described in detail.
The concept of power supply OFF means that an increase in the number of messages stored in the call control task mailbox 10b means that there is a demand exceeding the processing capacity of the program of the main controller 1, which is the most load factor. This is because, in order to eliminate the request message from the PHS, the power supply of a predetermined radio base station is turned off, that is, the radio base station is disconnected. The radio base stations to be turned off are not all, but are preselected or dynamically selected according to the load status.

  When the power supply of the radio base station is turned off, all messages from the PHS in the jurisdiction area of the radio base station do not reach the main control device 1, and as a result, the processing of the messages stored in the mailbox proceeds and overload The state will be released.

  Since the location registration message from the PHS is periodically transmitted, there is no problem in operation even if all of the location registration messages do not reach the main control device 1. In addition, because of the idea that not all of the radio base stations but part of the power supply is turned off, it does not prevent all oscillation requests from the PHS from reaching.

FIG. 3 shows an example of checking the mailbox of the call control task.
For example, if the total capacity is 32000 bytes and there is a message accumulation in which the message accumulation amount P1 exceeds the first threshold value P3, the power supply is turned off, that is, fail safe is performed. On the other hand, when the accumulation amount P1 decreases during the execution and becomes smaller than the second threshold value P2 (P3> P2), the power supply is turned on.

  FIG. 4 shows an example of selecting a radio base station whose power supply is controlled. For example, a maximum of 192 wireless base stations can be installed. In order to perform fail safe, to which radio base station of this radio base station the power supply is to be turned off is designated in advance in the operation setting in three stages. Note that it is not necessary to set all the operating radio base stations as power supply OFF targets. Thus, in order to prevent operation (use) from being impossible at all, there is a radio base station that is powered on around the radio base station that is powered off.

  The three stages in FIG. 4 define priorities, and feed the first radio base station (BS1, BS4, BS7, BS10) in which the mailbox accumulation amount P1 exceeds the first threshold value P3. Turn off. If the mailbox accumulation amount P1 does not fall below the second threshold value P2 even if monitoring is continued for a predetermined time width, for example, for one minute, the second radio base stations (BS2, BS5, BS8, BS11, BS13). , BS15) is turned off. Further, when a predetermined time width, for example, 30 seconds is monitored and the mailbox accumulation amount P1 does not fall below the second threshold value P2, the third radio base station (BS3, BS6, BS9, BS12, BS14, BS16, The power supply to BS17 and BS18) is turned off.

  Further, when the mail box accumulation amount P1 falls below the second threshold value P2, the power supply is turned on one by one every predetermined time of the first radio base station, for example, every 5 seconds. When all the first groups are powered on, if the second power is off, the power is turned on one by one in the same manner. The same applies to the third.

  Note that there is a method of actually turning off the power supply after notifying the subordinate PHS as notification information when the power supply of the base station is turned off. The PHS user will know the reason for the sudden disconnection, and convenience will be improved.

  FIG. 5 is a specific example of power supply ON / OFF in the radio base station 2. For example, a switch 2 a is provided in the power supply line of the 48 V DC power supply 30, and this is turned on / off from the task 10 d of the main controller 1. It is switched by command.

  FIG. 6 shows that the radio base station 2 is divided into a PHS side 20 and a main controller side 21, and power sources 40 and 41 are provided separately. It is turned off and the switch 2b on the PHS side 20 is always turned on.

  FIG. 7 shows an example in which the main control device 1 has a power source and the ON / OFF switch 1 a of the power supply line to the radio base station 2 is turned ON / OFF in the main control device 1. Of course, the switch 1a may be provided on the radio base station side.

Next, a modified example will be described.
(1) Although an example of power supply ON / OFF is used, there is a method in which the wireless base station maintains a power supply state and prohibits only transmission of a message to the main control device.
(2) There is also a method in which the reception task 1a of the main control device 1 has a fail-safe function so as to reject reception from a predetermined radio base station when the load increases.
(3) In the above (1) and (2), it is preferable to notify the subordinate PHS that the transmission is prohibited or rejected.

It is a structural example figure of the local PHS system of this invention. It is a block diagram centering on the program of the main control apparatus of the local PHS system of this invention. It is a figure which shows the relationship between the message | telegram accumulation amount of the call control task of this invention, and fail safe (power feeding OFF). It is a figure which shows the example of selection priority of the radio base station OFF in the fail safe of this invention. It is a mechanism diagram of power supply ON / OFF of the present invention. It is another mechanism figure of electric power feeding ON / OFF of this invention. It is another mechanism figure of electric power feeding ON / OFF of this invention.

Explanation of symbols

1 Main controller 2 Radio base station 3 PHS

Claims (1)

A plurality of radio base stations for relaying PHS, a control device connected to the plurality of radio base stations and receiving and processing messages from the PHS, and a part of the plurality of radio base stations to the radio base stations Power supply ON / OFF switch means,
The above control device receives a message related to call control obtained through a radio base station, stores it in a mailbox, performs message processing, checks the amount of message stored in the mailbox, A local PHS system in which the power supply ON / OFF switch to some of the radio base stations is switched to OFF when the accumulated amount is large.

Images