KR20060096128A - Over load controlling method of the mobile communication system - Google Patents

Abstract

The present invention relates to overload control in a mobile communication system, and more particularly, to prevent the occurrence of a failure of the system in advance due to a situation in which overload control by the overload control method set in the mobile communication system is impossible. An overload control method of a mobile communication system.

The present invention described above comprises a first step of setting an overload control condition having an overload control time and a call permission rate value by an operating station using statistical information according to an hourly load state of a mobile communication system; A second step of transmitting, by the operating station, an overload control condition to an exchange (MSC) of a mobile communication system when the start time of overload control by the operating station reaches after the first step; A third step of performing overload control according to the overload control condition of the second step; And a fourth process of releasing the overload control by the operating station when the overload control time has elapsed after the third process.

Mobile communication system, overload control, incoming call control, outgoing call control, paging control

Description

Overload controlling method of the mobile communication system

1 is a block diagram of a mobile communication system for overload control in the prior art,

2 is a signal flow diagram for the overload control of the prior art by the mobile communication system of FIG.

3 is a block diagram of a mobile communication system for overload control according to an embodiment of the present invention;

4 is a signal flowchart for overload control of the mobile communication system of the present invention in the mobile communication system of FIG.

* Description of Major Symbols in Drawings *

100: base station controller (BSC)

200: exchanger (MSC: Mobile Switching Center)

300: base station (BTS: base station transceiver station)

400: mobile station (MS)

500: communication network

600: operating station

The present invention relates to overload control in a mobile communication system, and more particularly, to prevent the occurrence of a failure of the system in advance due to a situation in which overload control by the overload control method set in the mobile communication system is impossible. An overload control method of a mobile communication system.

1 is a block diagram of a mobile communication system according to the related art. In order to provide a mobile communication service to a mobile communication terminal 100, a base station transceiver subsystem (BTS) is provided. , &Quot; BTS " (200), base station controller (BSC: Base Station Controller, " BSC ") 300, exchanger (MSC: Mobile Switching Center, " MSC ") 400 and the figure are not shown, but a gateway for interworking with a home location register (HLR), a visitor location register (VLR) and a public communication network (Gateway: hereinafter referred to as "GW") and the like.

In the above configuration, the BTS 200 is a device configured as a wireless transceiver and communicates with the MS 100 through a wireless link. That is, the BTS 200 provides a link between the MS 100 and the BSC 300, communicates with the MS 100 through a common air interface (CAI), and communicates with the BSC 300 through a wired network interface. .

The BSC 300 manages a plurality of BTSs 200, and is responsible for radio channel setting, frequency hopping, handover processing, and connects the BTS 200 and the MSC 400. And call control function. That is, the BSC 300 controls the call connection according to the number of allowable call connections between the MSs 100. To this end, the BSC 300 is equipped with a call controller (CC) 310.

In addition, the MSC 400 processes outgoing and incoming calls in each BTS 300, and the public telephone network (PSTN) with central control functions such as system management and billing of base stations so that all base stations can be efficiently operated. It performs the function of an exchange that performs a connection with an exchange of.

The MSC 400 for performing the above-described functions includes a switching subsystem (hereinafter referred to as "SS") 410 and an interconnection subsystem (hereinafter referred to as "IS") ( 420 and a common subsystem (hereinafter referred to as "CS") 430.

The above-described Switching Subsystem (hereinafter referred to as "SS") 410 determines the overload state of the call processing function and the mobile communication system including the mobile subscriber and the trunk line matching device, the time switch, and various signal devices. Call control is performed for call origination by calculating the call tolerance according to the overload condition.

The Interconnection Subsystem (hereinafter referred to as "IS") 420 performs a switching function for connecting SSs to each other at a central location of the exchange, a status management of subscribers in the exchange area, and a number translation function. Control is performed.

The Common Subsystem (hereinafter referred to as "CS") 430 may be used for the overall management of the exchange, including operation management, maintenance, mobile subscriber location registration, and MAP (Mobile Application Part) functions for data transmission and reception between HLR / SMS servers. Perform system control and billing functions.

 For overload control according to the control of the incoming and outgoing signals described above, the BSC 300 is equipped with a CC 310 for detecting information on a current call connection state and the like, and the SS 410 of the MSC 400 has a first overload. A traffic and resource controller (hereinafter referred to as "first TRC") 411, a telephony device system library (hereinafter referred to as "TDSL") 412, and a mobile call control unit (mobile) A Call Controller (hereinafter referred to as "MCC") 413 is mounted, and the IS 420 has a second traffic and resource controller (hereinafter referred to as "second TRC") for determining and setting an overload state for an incoming call. 421 and a paging controller (hereinafter referred to as " MPC ") are mounted.

FIG. 2 is a signal flow diagram illustrating a process for overload control in a conventional mobile communication system having the above-described configuration. Referring to FIG. 2, a process of overload control in a conventional mobile communication system will be described below. Same as

First, when the CC 310 of the BSC 300 is determined to be overloaded in call connection processing, the first TRC 411 of the call control state information of the CC 310 in the SS 410 of the MSC 400 is determined. Transfer to (S1).

The first TRC 411 having received the call control state information from the CC 410 determines whether the SS 410 is in an overloaded state at a preset overload detection period (eg, 2 seconds). The first TRC 411 of the SS 410 receives the overload state information input from the CC 310 of the BSC 300 and compares the reference value with a preset reference value for the number of call connections. The overload condition is exceeded, and the load rate of the CPU of each controller and the number of interprocessor communication (IPC) processes for processing control commands between the controllers are exceeded by comparing with a threshold value. Determine with. At this time, when the load transitions from the normal state (NORM) to the overload state, the call control level is determined according to the load state (S2).

As a result of the above-described determination of S2, if the SS 410 is not overloaded, the current state is maintained. If the SS 410 is not overloaded, the call tolerance value according to the call control level is calculated and determined. Outgoing signal control (call control according to the originating request of the mobile communication terminal) at 300 is performed. Here, in the case of call control, the call allowance is determined by multiplying the call control rate by the number of successful call occurrences of the previous period. In addition, the overload condition is reported to the CC 310 of the BSC 300 to allow only the number of calls allowed, so that the BSC 300 performs the call control. If the number of call allowances calculated in the above-described process is 0, the first TRC 411 transmits the origination prohibition message to the CC 310, and the CC 411 blocks the connection of the outgoing call so that The failure is blocked (S3).

Next, the call permission value determined in step S3 is transmitted to the TDSL 412 to update the preset call permission value (S4).

The MCC 413 of the SS 410 requests the call tolerance value from the TDSL 412 when performing the call processing, and performs the call control if the SS 410 is overloaded according to the result (S5).

At the same time as the process S4, the first TRC 411 reports the call tolerance of the SS 410 determined in the process S3 to the second TRC 421 of the IS 420, so that each SS 410 installed in the MSC 400 is processed. ) Performs the incoming call control (control of the paging signal transmission to the called terminal by the mobile communication system) (S6).

The MPC 422, which is an outgoing signal processor of the IS 420, controls the incoming call by controlling the paging according to the overload state by requesting the current overload state from the TRC 411 at the time of paging attempt. That is, paging is attempted only for the number allowed in this process, and the paging exceeding the number is controlled as an error (FAIL) to control the incoming signal (S7).

That is, the mobile communication system according to the related art performs an overload control at a preset period (for example, 2 seconds) by determining that the addition of the number of calls allowed or the load rate of the CPU of each controller exceeds a preset value as an overload condition. do. The above-described overload control is performed according to the call control level. When the load transitions from the normal (NORM) state to the overload state, the call control level is determined according to the load state. In more detail, in the case of outgoing call control, only the call allowance number determined by multiplying the call control rate by the call success rate of the previous period is determined. At this time, if the number of call allowances is 0, the call prohibition message is transmitted to CC 310. In case of the incoming call control, the determined call control rate is transmitted to the IS 420, and the IS 420 receives the call control rate and performs the incoming call control according to the call control rate for the incoming call to the corresponding SS 420. It is.

However, the overload control method in the mobile communication system in the related art as described above, the overload control only when the average load of the processor configured in the CC 310, SS 410, IS 420 is more than the processor load tolerance It is supposed to perform However, when the call is congested, the processor load increases with the exponential function. Therefore, if overload control is performed only when the average processor load is greater than or equal to the processor load allowance, it is impossible to perform an appropriate overload control for the increase of the load of the processor, which increases with an exponential function during the congestion of the call. Has the problem.

Accordingly, the present invention is to solve the above-mentioned problems in the prior art, and in addition to the mobile communication overload control in the prior art, using the statistical information about the traffic of the system is set in a specific time zone when the traffic congestion occurs An object of the present invention is to provide an overload control method of a mobile communication system which prevents the occurrence of a failure of the mobile communication system due to an overload of the mobile communication system by performing call control on an incoming signal according to an overload control condition.

In the overload control method of the mobile communication system of the present invention for achieving the above object, the overload control condition having an overload control time and call tolerance value by the operating station using the statistical information according to the hourly load state of the mobile communication system. Setting a first process; A second step of transmitting, by the operating station, an overload control condition to an exchange (MSC) of a mobile communication system when the start time of overload control by the operating station reaches after the first step; A third step of performing overload control according to the overload control condition of the second step; And a fourth process of releasing the overload control by the operating station when the overload control time has elapsed after the third process.

The third step includes: a call tolerance determination step of determining a call tolerance according to the call admission rate; And an overload control process for performing overload control according to the call tolerance.

The overload control process of the third process may include an outgoing signal control for allowing an outgoing signal within the call allowance and an incoming call control for transmitting a paging signal within the call allowance.

Hereinafter, the present invention will be described in more detail with reference to the accompanying drawings.

3 is a view showing the configuration of a mobile communication system to which the overload control method of the mobile communication system according to the present invention is applied.

As shown in FIG. 3, a base station transceiver subsystem (BTS) is provided to provide a mobile communication service to a mobile communication terminal (hereinafter referred to as "MS") 100 according to the present invention. BTS "), a base station controller (BSC: Base Station Controller, " BSC ") 300, a switchboard (MSC: Mobile Switching Center, " MSC ") 400, and Although not shown in the drawing, the Home Location Register (hereinafter referred to as "HLR"), the Visitor Location Register (hereinafter referred to as "VLR") and the gateway for interworking with the public network (Gateway) (Hereinafter referred to as " GW ") and the like, and an operating station 600 which transmits an operating station control command through a communication network so that overload control by the operating station can be performed at a specific time when congestion is expected according to the present invention. Configured in the Common Subsystem (CS) 430 of the MSC 400 Is configured to work with an overload controller (Traffic and Resource Management Controller, hereinafter "TRM") 431.

The BTS 200 is a device configured as a wireless transceiver and communicates with the MS 100 through a wireless link, and the BSC 300 controls the call connection according to the number of call connections allowed between the MSs 100. To this end, the BSC 300 is equipped with a call controller (CC: Call Controller) as described in the related art.

 And, as described in the prior art, the MSC 400 also determines the overload state of the mobile communication system therein, and then calculates a call allowance according to the overload state to perform a call control on the originating signal. A switching subsystem (hereinafter referred to as "SS") 410, an interconnection subsystem (hereinafter referred to as "IS") 420 that performs control over incoming calls, and billing and overall system control. It is configured to include a common subsystem (hereinafter referred to as "CS") 430 to perform.

The SSC 410 of the MSC 400 includes a first traffic and resource controller (hereinafter referred to as a "first TRC") 411 and a system information storage unit (hereinafter referred to as a "telephony device system library"). TDSL "412 and a Mobile Call Controller (MCC) 413 are mounted. In addition, the IS 420 includes a second traffic and resource controller (hereinafter referred to as "second TRC") 421 and a paging controller (Mobile Paging Controller) for determining and setting an overload state for an incoming call. (Hereinafter referred to as "MPC") is the same as the prior art, and in addition, the CSC 430 of the MSC 400 as an aspect of the present invention manages the overload control to perform the overload control according to the call control conditions of the operating station The TRM 431 is mounted.

In addition, the above-described operating station 600 is configured with a network management server (not shown) and a terminal equipped with a network management program such as Cisco, Novell, etc., such as BTS 200, BSC 300, MSC 400, and the like. Remote monitoring of the state, control according to each state, if the overload control by the control of the operating station is required by the TRM 431 mounted on the CS 430 of the MSC 400, the operating station is set by time according to the statistical data It is characterized in that the mobile communication system can perform the overload control by the operating station by transmitting an overload control condition having one call acceptance rate.

In the general state, the mobile communication system having the above-described configuration transitions to an overload state when the CPU load of each control unit is equal to or greater than the reference value (Minor Reference), and performs overload control in units of preset periods (for example, two seconds). . Overload control is performed according to the call control level (steps 0-11). After that, when the time set to the time when the call is congested according to the statistical data on the call connection request by time arrives, the mobile communication system performs the overload control on the incoming / outgoing call according to the control command by the operating station. By effectively preparing the control, it is possible to prevent the failure of the mobile communication system due to the congestion of the call that occurs before the overload control in the overload condition.

4 is a signal flowchart illustrating a process of an overload control method in the above-described mobile communication system of FIG. 3.

As shown in FIG. 4, the overload control processes S11 to S17 in a general state are performed in the same manner as the processes S1 to S7 for overload control in the prior art of FIG. 2. Therefore, the description of the overload control process that overlaps with the prior art will be omitted, and the following will describe in detail the process related to the overload control method of the mobile communication system according to the present invention.

As shown in FIG. 4, the mobile communication system generally performs overload control of the mobile communication system at a predetermined period (for example, 2 seconds) by the processes S1 to S7 illustrated in FIG. 2.

At this time, the operating station stores the overload control time calculated by the statistical information according to the time-based call connection state in each BSC 300 and the MSC 400, call allowance information for overload control, When it arrives, the TRM 431 mounted on the CS 430 of the MSC 400 to be overloaded control has an overload control time and an overload control time for the overload control together with the overload control command by the operating station. The condition information is transmitted (S18).

The TRM 431 of the MSC 400 that receives the overload control command from the operating station 600 transmits the overload control command and call permission information to the TRC 411 mounted on the SS 410 of the MSC 400. (S19). Although the overload control condition information having the overload control command and the call permission rate by the operating station in step S19 described above may be automatically transmitted by the network management server according to a preset time period in the system, otherwise, it is transmitted to the operator of the operating station when necessary. May be input and transmitted.

The first TRC 411 of the SS 410, which has received the overload control command and the call acceptance rate by the operating station from the TRM 431 of the CS 430, stops the overload control process in the current state and transmits the call transmitted from the operating station. The number of call allowances (call allowance) is calculated according to the allowance rate (S20).

Next, the first TRC 411 of the SS 410 transmits information on the number of call allowances (call allowances) determined in step S20 to the CC 311 of the BSC 310 (S21) and originates from the BSC 310. Overload control is performed by performing call control on the call (S22).

In addition, the first TRC 411 of the SS 410 transmits the call allowance number (call tolerance) information determined in step S20 at the same time as step S21 to the TDSL 412 of the SS 410 to allow the call allowance according to the operating station control command. To store the information (S23).

Thereafter, the MCC 413 of the SS 410 performs control on the originating signal from the MSC 400 according to the call allowance value according to the operating station control command stored in the TDSL 412 (S24).

In addition, the TRC 411 of the SS 410 transmits to the second TRC 421 mounted on the IS 420 of the MSC 400 at the same time as the process S21. The MPC 422 of the IS 420 performs paging control, that is, incoming call control, according to the number of call allowances (call allowances) determined in step S20 registered in the second TRC 421 (S26).

Processes S21 to S22, S23 to S24, and S25 to S26 may be performed regardless of the order or may be performed simultaneously.

In the above-described process of the present invention, it is possible to efficiently perform overload control of the mobile communication system by enabling the overload control at the time when call congestion occurs according to the statistical data to be performed efficiently according to the operating station control command. .

According to the present invention described above, in the overload control of the mobile communication system, it is determined that the call congestion will exceed the load state of the processors configured in the mobile communication system according to the collected statistics on the call congestion of the mobile communication system. By performing the overload control according to the overload control command by the operating station in the prior art, the mobile communication system in the prior art is not prepared for the exponential increase of the overload due to the congestion of the problem to solve the problem that a serious failure occurs It provides the effect of improving operational stability.

Claims (2)

 A first step of setting an overload control condition having an overload control time and a call allowance value by an operating station using statistical information according to the hourly load state of the mobile communication system; A second step of transmitting, by the operating station, an overload control condition to an exchange (MSC) of a mobile communication system when the start time of overload control by the operating station reaches after the first step; A third step of performing overload control according to the overload control condition of the second step; And a fourth process of releasing the overload control by the operating station when the overload control time has elapsed after the third process. The method of claim 1, wherein the third process comprises: A call tolerance determining step of determining a call tolerance according to the call tolerance; And an overload control process for controlling an outgoing signal within a call allowance determined in the call allowance determining process and an incoming call control for controlling the transmission of a paging signal within the call allowance. Overload control method of mobile communication system.

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