JP4771884B2 - Base station apparatus and congestion avoidance method for base station apparatus - Google Patents

Description

  The present invention relates to a base station apparatus and a congestion avoiding method for avoiding congestion of the base station apparatus.

  In data communication in PHS, a communication method called slot connection is adopted in order to provide a high-speed communication service to users connected to a base station.

Hereinafter, the slot connection communication will be described with reference to the drawings.

FIG. 2 is a diagram showing slots in general communication that are not slot-connected. In normal TDMA communication, the time axis is divided and the line is allocated.

In this example, the time axis is divided into 8 slots, and time division control is repeatedly performed for each frame. In this case, four lines A, B, C, and D can be used in pairs of a transmission slot and a reception slot. This state is the basic method, and the maximum line can be used.

  As described above, in recent years, there has been a growing need for users to transmit more information, and there is a method for transmitting more information by connecting slots. FIG. 3 is a diagram showing slots at the time of communication in which slot connection is performed. In this case, instead of increasing the number of slots allocated per user, the number of available lines decreases as a whole. In this example, line A has the same transmission capacity as that of the basic system, but line B can perform communication with a transmission capacity approximately three times that of the basic system. However, while the basic system can use 4 lines (4 users), only 2 lines (2 users) can be used.

Thus, in the slot connection state, a larger number of lines cannot be secured.

  In addition, in the event of a disaster such as an earthquake, many users call all at once to ensure urgent contact and safety, so communication exceeding the line capacity is required, and as a result, a state called communication congestion that prevents communication is generated. .

  In addition, base station devices such as PHS (Personal Handy-phone System), which are small and light in weight, are often installed on utility poles, building rooftops, and the like. For this reason, it is more susceptible to external influences such as strong winds and earthquakes than a device installed indoors, and the failure rate is high.

  A conventional base station apparatus includes a maintenance diagnosis unit. The maintenance diagnosis unit monitors the internal state of the base station device and attempts to recover autonomously when it detects a failure. In addition, the maintenance diagnosis unit notifies the base station management device, which is a higher-level device, of information related to the occurrence or recovery of the failure.

Patent Document 1 listed below is a mobile phone having an Internet connection function and an e-mail transmission / reception function, and includes one or more types of means for detecting an abnormal situation or an emergency situation. A technology related to a mobile phone that receives and transmits the above information is disclosed. Further, in Patent Document 2 below, the base station transmits a communication restriction message for selectively prohibiting transmission via a broadcast channel to the mobile station, so that the mobile station prohibits transmission and “location registration”. A technique for transitioning to a regulation standby mode without performing the process is disclosed.
JP 2005-311995 A JP-A-8-317471

  As mentioned above, in the event of a disaster such as an earthquake, many users call all at once to ensure urgent contact and safety, so communication exceeding the line capacity is required, and as a result, there is a state where communication is impossible, called congestion. appear. In particular, in the state where the slot connection communication is performed in the data communication, the number of users assigned to the communication is less than the maximum number, so that congestion easily occurs particularly in the circuit switching type communication such as voice communication. Also, in packet communication, which is data communication, since the number of assignable slots is reduced, a large number of transmission waits occur, and the overall throughput is significantly reduced.

  In addition, the base station does not have a function for performing congestion avoidance control, and cannot perform autonomous and detailed congestion avoidance control. That is, the base station performs congestion avoidance control in accordance with instructions and commands related to congestion avoidance control from the upper communication network. Furthermore, when there is no congestion avoidance control instruction from the upper communication network due to some kind of communication failure, it is not possible to shift to congestion avoidance control.

  The present invention has been made in view of the above-described conventional problems, and based on earthquake shake information collected by the base station itself, a base station apparatus capable of performing congestion avoidance communication control suitable for the base station, and An object of the present invention is to provide a congestion avoidance method for a base station apparatus.

In order to achieve the above object, a communication base station apparatus according to the present invention communicates with a plurality of users by time division multiplex communication, and continuously at least a part of a plurality of slots allocated to the plurality of users. In the case of performing slot connection communication assigned to one user, the environment information acquisition means for acquiring the environment information of the communication base station, and the magnitude of the shake indicated by the vibration information which is the acquired environment information exceeds a predetermined value wherein the Ru and a congestion avoidance control means for changing the number of consecutive slots in the slot coupled communication when.

  Furthermore, in one aspect of the present invention, the environment information acquisition unit is a vibration sensor that detects vibration information.

In addition, the present invention provides a communication base that communicates with a plurality of users by time division multiplex communication and performs slot connection communication in which at least a part of the plurality of slots allocated to the plurality of users is continuously allocated to one user. A method for avoiding communication congestion in a station, the step of acquiring environmental information of a communication base station, and the slot connection when the magnitude of fluctuation indicated by vibration information as the acquired environmental information exceeds a predetermined value A congestion avoidance control step for changing the number of consecutive slots in communication ;
It is characterized by including.

  According to the base station apparatus and the congestion avoidance method of the base station apparatus in the present invention, it is possible to perform congestion avoidance communication control suitable for the base station based on the shake information collected by the base station itself. Further, it is possible to predictively perform congestion avoidance control before congestion starts. Furthermore, even if an instruction regarding congestion avoidance control from the host management device does not come due to some kind of communication failure, etc., if the base station observes shaking, it can autonomously perform congestion avoidance communication control and secure the number of lines. be able to.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. FIG. 1 is a functional block diagram of the base station apparatus 1. The base station apparatus 1 includes an external interface unit 11, a signal processing unit 12, a slot connection unit 13, a radio unit 14, an avoidance control unit 16, an acceleration calculation unit 17, and an acceleration sensor 18.

  A control unit (not shown) includes an operation management unit, a radio control unit, and a line control unit, and includes a CPU, a memory, and the like, and performs control related to the operation of the base station apparatus 1 as a whole.

  The wireless communication unit 14 includes an antenna 15, is connected to the slot coupling unit 13, and is connected to the external interface 11 via the signal processing unit 12. The radio unit 14 receives a signal from each communication device 2 received by the antenna 15 and converts the signal into a signal that can be processed by the slot coupling unit 13 and the signal processing unit 12. The slot connecting unit 13 separates the slot of the signal connected by the slot received by the radio unit 14 and sends it to the signal processing unit 12. The signal processing unit 12 demodulates the received signal from which the slots are separated, extracts the packet, and outputs the packet to the external interface 11. Also, a plurality of packets input from the external interface 11 are modulated and sent to the slot connector 13. The slot connection unit appropriately connects communication slots according to a control unit (not shown) and sends the communication slot to the radio unit 14. The radio unit 14 transmits the signal received from the slot coupling unit 13 to each communication device 2 via the antenna 15.

  The external interface 11 is connected to a communication network via an ISDN (Integrated Service Digital Network) line, Ethernet (registered trademark), or the like, and connects the base station apparatus 1 and the communication network to each other. The interface 11 outputs a packet input from the communication network to the signal processing unit 13 in accordance with an instruction from the control unit. In addition, a plurality of packets input from the signal processing unit 13 are output to the communication network.

  The maintenance diagnosis unit 50 includes a failure monitoring unit (tilt notification unit) 52, an antenna diagnosis unit 54, a line diagnosis unit 56, and a tilt diagnosis unit 60. The maintenance diagnosis unit 50 monitors the operating state of each functional block of the base station device 10 and attempts to recover autonomously when it detects the occurrence of a failure. Further, as necessary, the base station management device that is a host device or an online center including the base station management device is notified of information related to the occurrence or recovery of a failure. The failure monitoring unit 52 is connected to the antenna diagnosis unit 54, the line diagnosis unit 56, and the inclination diagnosis unit 60, and monitors the diagnosis result input from each diagnosis unit, and if necessary, causes a failure to the base station management device or the like. Notify such information. The antenna diagnosis unit 54 is connected to the failure monitoring unit 52 and is connected to the wireless communication unit 30 and the antenna 32 via the wireless control unit 24. And while diagnosing the state of the radio | wireless communication part 30 and the antenna 32, a diagnostic result is output to the failure monitoring part 52. FIG. The line diagnosis unit 56 is connected to the failure monitoring unit 52 and is connected to the line interface 40 via the line control unit 26. Then, the state of the line connected to the base station apparatus 10 is diagnosed, and the diagnosis result is output to the failure monitoring unit 52.

  The acceleration sensor 18 is a vibration sensor that detects vibration information. The acceleration calculation unit 17 calculates a gravitational acceleration vector applied to the base station apparatus 1 measured by the acceleration sensor 18 and acquires a correspondence with the time axis of the calculated gravitational acceleration vector. That is, a change in the time direction of the gravitational acceleration vector is acquired. Further, the acquired data on the change in the time direction of the gravitational acceleration vector is stored in a storage unit (not shown). The acceleration sensor 18 is fixed to the base station apparatus 1 and measures the acceleration applied to the base station apparatus 1. The acceleration sensor 18 is a sensor that measures the magnitude of acceleration applied to the attached object. Specifically, the acceleration sensor 18 measures the magnitude and direction of the gravitational acceleration (gravity acceleration vector) and uses the acceleration sensor 18 as a reference. The x, y, z direction components of the gravitational acceleration vector in the coordinate system are acquired. In the present embodiment, each component of the gravitational acceleration vector measured by the acceleration sensor 18 is used as an acceleration applied to the base station apparatus 1. Here, when the base station apparatus shakes due to an earthquake or the like, the acceleration acquired by the acceleration calculating unit 17 may be an average value of values measured by the acceleration sensor 18 at a predetermined sampling period. By so doing, variations in measurement values related to the gravitational acceleration vector by the acceleration sensor 18 are reduced, and the measurement accuracy is improved.

  The avoidance control unit 16 performs control related to congestion avoidance based on the gravitational acceleration vector calculated by the acceleration calculation unit 17. The operation of the avoidance control unit 16 will be described with reference to FIG.

  Information on the gravitational acceleration vector acquired by the acceleration sensor 18 and calculated by the acceleration calculation unit 17 is organized into the following two pieces of information. a is seismic intensity information, and b is shaking time.

a Seismic intensity: Indicates the maximum acceleration of shaking. Flag if any seismic intensity is exceeded.

b Shaking time: Indicates the time during which acceleration greater than an arbitrary acceleration has been detected. A flag is set if any shaking time is exceeded.

FIG. 4 shows the handling level of avoidance communication control, and the black circle in this figure indicates that a flag is set.

Further, a control unit (not shown) performs a self-diagnosis process of an emergency power source provided in the base station based on the gravitational acceleration vector. The self-diagnosis result is stored in a storage unit (not shown) and can be referred to by the avoidance control unit 16. The avoidance control unit 16 performs optimum congestion avoidance communication control for the base station based on the relationship among the seismic intensity, the shaking time, and the self-diagnosis result shown in FIG. For example, by changing from small-capacity large-capacity communication control to large-capacity small-capacity communication priority (number of lines reservation priority) control, a line is secured in the event of a disaster such as an earthquake. For example, if the seismic intensity is greater than a predetermined seismic intensity and the shaking time is longer than a predetermined value, slot connection is impossible regardless of the self-diagnosis result of the emergency power supply. If the seismic intensity is greater than the specified seismic intensity and the shaking time is shorter than the specified time, slot connection is not possible when the emergency power supply self-diagnosis result is “Voltage drop”, but the emergency power supply self-diagnosis result is “normal”. If so, slot connection is allowed up to 2 connections.

  Further, the congestion avoidance communication control may be canceled after a predetermined time elapses according to the use status of the line or an instruction from the base station management apparatus that is the host apparatus.

Next, the congestion avoiding operation of the base station apparatus 1 will be described based on the flowchart of FIG.
First, a base station is installed and normal operation is performed (S10). When a shake such as an earthquake occurs, it is determined whether the gravitational acceleration vector applied to the base station calculated by the acceleration calculation unit 17 is equal to or greater than a specified value (S20). If it is not over the limit, return to normal operation. If it exceeds the limit, the avoidance control unit 16 starts congestion avoidance control (S30). At this time, flags are set according to the seismic intensity and shaking time. Further, a self-diagnosis of the emergency power supply of the base station is executed, and whether it is normal or the voltage is lowered is stored in the storage unit (S40). Subsequently, the countermeasure level of avoidance communication control is determined using FIG. 4 (S50). Then, the slot connection number is changed according to the determined handling level (S60). Subsequently, it is confirmed whether or not the change of the slot connection number is completed (S70). If not completed, the process returns to S60. If completed, an operation to maintain congestion avoidance control is performed. (S80). Then, it is confirmed whether a predetermined congestion avoidance control time has elapsed. If it has elapsed, the normal operation mode is restored (S110). Even when the time has not elapsed, if there is an instruction from the upper management device to cancel the congestion avoidance control, the normal operation mode is similarly returned to the upset (S110). If there is no cancellation instruction, an operation for maintaining congestion avoidance control is performed.

  According to the base station apparatus and the congestion avoidance method of the base station apparatus described above, it is possible to perform congestion avoidance communication control suitable for the base station based on the shake information collected by the base station itself. Further, it is possible to predictively perform congestion avoidance control before congestion starts. Furthermore, even if an instruction regarding congestion avoidance control from the host management device does not come due to some kind of communication failure, etc., if the base station observes shaking, it can autonomously perform congestion avoidance communication control and secure the number of lines. be able to.

  The present invention is not limited to the above embodiment. For example, in the above embodiment, the time for maintaining the congestion avoidance control may be determined according to the handling level of avoidance communication control.

It is a functional block diagram of the base station apparatus which concerns on embodiment of this invention. It is a figure showing the slot at the time of general communication which is not slot-linked. It is a figure showing the slot at the time of communication which is performing slot connection. It is the figure which showed the coping level of avoidance communication control. It is a flowchart which shows the operation | movement concerning the congestion avoidance control of a base station apparatus.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 1 Base station apparatus, 2 External communication apparatus, 11 External I / F part, 12 Signal processing part, 13 Slot connection part, 14 Radio | wireless part, 15 Antenna, 16 Avoidance control part, 17 Acceleration calculation part, 18 Acceleration sensor

Claims (3)

In a communication base station that performs communication with a plurality of users in time division multiplex communication, and performs slot concatenated communication in which at least a part of a plurality of slots allocated to the plurality of users is continuously allocated to one user,
Environmental information acquisition means for acquiring environmental information of the communication base station;
Congestion avoidance control means for changing the number of consecutive slots in the slot connection communication when the magnitude of shaking indicated by the vibration information that is the acquired environmental information exceeds a predetermined value ;
Communication base station device characterized by Ru with a. The communication base station apparatus according to claim 1, wherein the environment information acquisition unit is a vibration sensor that detects vibration information. Communication congestion avoidance in a communication base station that communicates with a plurality of users by time division multiplex communication and performs slot-linked communication in which at least a part of the plurality of slots allocated to the plurality of users is continuously allocated to one user A method,
Obtaining environmental information of the communication base station;
A congestion avoidance control step of changing the number of consecutive slots in the slot connection communication when the magnitude of the vibration indicated by the vibration information that is the acquired environment information exceeds a predetermined value ;
Congestion avoidance method characterized by including.

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