KR100199026B1 - Overload control method between bsc and bts call processing processor - Google Patents

Abstract

The present invention relates to a method for controlling a load between a control station and a call processing processor of a base station in a mobile communication system. The present invention relates to an overload control method of a base station call processor in a CDMA mobile communication system. A first step of receiving control information, a second step of accepting a call request as much as a variable permission rate of the control information, a third step of checking whether another control information is received from the call control processor in the control section, and the second step If it is determined in step 3 that another control information is received from the call control processor in the control section, it is determined that another control information is not received from the call control processor in the control section in the fourth process and the third process of terminating. If it is determined, a tie is transmitted while sending a control confirmation request message to the call control processor. The driving and so on to claim 5 comprising a process of proceeding with the second step, the invention as described above has the effect that the call processing to prevent the performance degradation caused by an overload occurs on the control station.

Description

Load control method between control station and call processing processor of base station

1 is a structural diagram of a base station system of a CDMA mobile communication system according to the present invention;

2 is a flowchart of load control information processing in a call control processor.

3 is a flowchart of overload control in a base station call processor.

4 is a flowchart of call admission / rejection processing in a base station call processor.

The present invention relates to a load control method in a mobile communication system, and more particularly, to a method for controlling a load between a control station and a call processing processor of a base station in a mobile communication system.

In general, a CDMA mobile system (hereinafter, referred to as a CMS) is a mobile communication system based on a storage program control scheme, and is a system configured by layering a plurality of processors. .

A base station controller controls a plurality of base transceiver subsystems.

The control station and the base station may be overloaded due to the occurrence of a large number of calls.

In this case, the conventional method has a problem in that when the overload is detected by the control station, the overload is controlled only by the control station, so that the call generated from the base station cannot be controlled in advance, making it difficult to efficiently operate the system.

Therefore, there is a need for a method of controlling call generation in a base station so as to control overload due to load concentration of a control station.

SUMMARY OF THE INVENTION An object of the present invention for solving the above problems is to control the load by interworking between the control station and the base station when the load generated by the call control processor and the base station call processor of the control station and the base station reaches an overloaded state, The purpose is to prevent the system from affecting the whole system.

A feature of the present invention for achieving the above object is a load control information processing method which is executed when an occurrence of overload is detected in a call control processor in a CDMA mobile communication system or driven by a timer. Based on the processor occupancy of the station, the corresponding variable permitting rate, that is, when the control station processor occupancy is 0 to 100, the variable permitting rate is 1- (processor occupancy), and the larger the processor occupancy, the smaller the variable permitting rate. In the first process of transmitting a variable license rate to the base station when the occupancy rate of the control station processor is 50% or more, the control confirmation request message is received from the base station call processor within a predetermined time. Trigger level message with no special structure, received from control station at base station The call is accepted or rejected according to the control information-variable license rate. If the variable license rate is received at 30% and the base station controls the call, the state of the control station is changed and the variable license rate is increased to 40% and sent to the base station. However, if this information fails to arrive at the base station, the message is lost. The base station continues to reject about 10% of calls during the control period, which reduces the acceptance rate of the call. Requesting to inquire of the load status of the control station. Therefore, this message is used to provide the call processor of the base station with the load state of the control station. If it is determined in the second step that the control confirmation request message has not arrived within a certain time, the step of clearing the timer and ending; In step 3, it is determined that the control confirmation request message has been reached in step 2, and in step 4, receiving the received control confirmation request message, and checking the received control confirmation request message to check whether the current load state has changed. If it is determined that the current load state is changed in the fifth process and the fifth process, if it is determined that the current load state has not changed in the sixth process proceeding to the first process and the fifth process, the timer is driven and terminated. In the seventh process.

Another aspect of the present invention for achieving the above object is a method for overload control in a base station call processor in a CDMA mobile communication system, the first step of receiving control information transmitted from a call control processor, the variable permission of the control information A second step of accepting a call request as much as a rate, a third step of checking whether another control information is received from the call control processor in the control section, and another control from the call control processor in the control section in the third step If it is determined that the information has been received, if it is determined that another control information has not been received from the call control processor in the control section in the fourth process and the third process of terminating, while transmitting the control confirmation request message to the call control processor, The fifth process of driving the timer and proceeding to the second process. .

Another feature of the present invention for achieving the above object is a method for processing call approval and rejection in a base station call processor when a call is generated from a mobile subscriber in a CDMA mobile communication system. In step 1, if it is determined in the first step that the rejection information indicates a rejection state, in the second process of notifying and terminating the rejection of the call to the mobile subscriber, and if it is determined that the rejection information does not indicate the rejection state in the first process, the call This is because the third step of transmitting and ending the call request message to the call control software.

Hereinafter, with reference to the accompanying drawings will be described in detail one of the preferred embodiments according to the present invention.

1 is a structural diagram of a base station system of a CDMA mobile communication system according to the present invention.

Referring to Figure 1, the structure of a base station system of a CDMA mobile communication system according to the present invention will be described.

The CMS is composed of a control station operation preservation device (abbreviated as BSM), a control station, a base station, a mobile station and a mobile switching center.

One BSM manages twelve control stations, which perform the operation and maintenance functions of the control station and the base station.

Within one control station, there is a Call Control Processor (hereinafter referred to as CCP) and 32 Selector Interface Modules (hereinafter referred to as SIM), which are in charge of wired and wireless link control signal processing and call control. do.

The CDMA Interconnection Network (CIN) of the control station provides a communication path by packet data transmission between the BSM and the control station and the base station.

The SIM is composed of a selector matching processor (hereinafter referred to as SIP), a selector vocoding processor (hereinafter referred to as SVP), and the like.

One control station can accommodate up to 32 base stations and 32 SIPs, and one SIP can connect with up to four SVPs.

The base station is connected to the control station by a midline and routes or transmits and receives control information through interworking with the CCP, and routes and transmits and receives traffic information of the mobile station.

Each control station connects each control station CIN to four group CINs to form a control station network.

In addition, the base station call processor (hereinafter abbreviated as BCP) of the base station controls the call in cooperation with the CCP of the control station.

As such, the control station and the base station are configured by layering several processors.

Call origination starts at the base station and location registration, paging and call processing are concentrated at the control station.

2 is a flowchart of load control information processing in the call control processor.

A process of processing load control information in the call control processor will be described with reference to FIG. 2.

When the CCP is overloaded or driven by a timer, the process is executed by an operating system.

In S201 transmits the control information through the control process to the BCP.

Here, the transmission information includes a variable permission rate of the call for each overload class.

In S202, the control confirmation request message from the BCP within a certain time is checked whether the CCP has been reached.

If it is determined in S202 that the control confirmation request message has not been reached within a certain time, the timer is cleared and terminated in S206.

That is, the CCP stays in a waiting state for a while while being processed in the BCP.

If it is determined in S202 that the control confirmation request message has been received, S203 receives the reached control confirmation request message.

In S204, the control check request message received is checked to see if the current load status has changed.

If it is determined in S204 that the current load state has changed, the process proceeds to S201.

If it is determined in S204 that the current load state has not changed, in S205 a timer for repeating this process is driven and terminated.

3 is a flowchart of overload control in a base station call processor.

Referring to Figure 3 describes the process of overload control in the base station call processor as follows.

In S301 receives the control information transmitted from the CCP.

In S302, the class control counter is cleared to zero.

In S303, a random license rate included in the transmitted control information is generated to generate a random number. (Generation of random numbers is generally provided by using a rand (seed) system library owned by all operating systems.)

In S304, the modulo value is 100, that is, the modulo 100 is 99 if the random number is 999. The value is between 0 and 99. It is checked whether this is less than the variable permission rate of the control information.

If it is determined in step S304 that the random number is a module value is not smaller than the variable permission rate of the control information, S305 rejects the call entry and stores the rejection information and terminates. Will have the value of.

This is done each time a call occurs, assuming that the variable grant rate-control information-received from the control station is 66%, the call is accepted if the result of this modulo 100 is 0-66, and if it has a value of 67-99, the call is rejected. do.)

If it is determined in step S304 that the value modulo to 100 is smaller than the variable permission rate of the control information, then in step S306, the controller accepts the incoming call and increments the control counter.

In S307, the rejection information is cleared.

In S308, it is checked whether the variable permission rate of the control information is equal to the control counter.

If it is determined in S308 that the variable permission rate of the control information is not equal to the control counter, the flow proceeds to S303.

In other words, the call is repeatedly performed until the control counter reaches the variable permission rate of the control information.

If it is determined in step S308 that the variable permission rate of the control information is the same as the control counter, in step S309 it is checked whether another control information is received from the CCP in the control section.

If it is determined in step S309 that another control information has been received from the CCP in the control section, the process ends.

If it is determined in step S309 that another control information has not been received from the CCP within the control section, S310 transmits a control confirmation request message to the CCP.

In S311, the timer is driven and the process proceeds to S302.

4 is a flowchart of call admission / rejection processing in a base station call processor.

Referring to Figure 4 describes the call approval / rejection process in the base station call processor as follows.

In S401, it is checked whether a call has occurred from the mobile subscriber.

Here, the approval of the entry of the call grants the entry of the call within the duration of the control counter according to the variable license rate.

If it is determined in S401 that no call has occurred, the flow proceeds to S401.

If it is determined in S401 that a call has occurred, it is checked in S402 whether the reject information indicates a reject state.

If it is determined in step S402 that the rejection information indicates a rejection state, S403 notifies the mobile subscriber of the rejection of the call and ends.

If it is determined in step S402 that the rejection information does not indicate a rejection state, that is, if the rejection information is determined to be '0', since the call is possible in S404, the call control software transmits the call request message and ends.

Therefore, the present invention as described above has an effect in preventing the call processing performance degradation caused by the overload generated in the control station.

As a result, the capacity of the call handled by the control station and the base station is kept constant even under an overload condition, which greatly contributes to improving the performance of the system and maintaining the high reliability of the CMS mobile system.

In the future, it will be easy to apply to the implementation of personal mobile communication.

Claims (4)

Claims [1] A load control information processing method executed when an occurrence of overload is detected in a call control processor or driven by a timer in a CDMA mobile communication system, the method comprising: a first step of transmitting the controlled information to a base station call processor; A second step of checking whether a control confirmation request message has arrived from the base station call processor within the predetermined time; A third step of clearing and ending the timer if it is determined that the control confirmation request message has not been reached within a predetermined time in the second step; A fourth step of receiving the reached control confirmation request message if it is determined that the control confirmation request message has been reached in the second step; A fifth step of checking whether the current load condition has been changed by examining the received control confirmation request message; A sixth process of proceeding to the first process when it is determined that the current load state is changed in the fifth process; And a seventh process of driving and terminating a timer if it is determined that the current load state has not changed in the fifth process. The method of claim 1, wherein the control information transmitted to the base station call processor in the first process includes a variable permission rate of a call for each overload class. An overload control method in a base station call processor in a CDMA mobile communication system, comprising: a first step of receiving control information transmitted from a call control processor; A second step of accepting a call request equal to the variable permission rate of the control information; A third step of checking whether another control information is received from the call control processor in a control section; A fourth step of terminating if it is determined that another control information has been received from the call control processor in the control section in the third step; And if it is determined in the third step that another control information has not been received from the call control processor in the control section, driving a timer while transmitting a control confirmation request message to the call control processor and proceeding to the second step. An overload control method in a base station call processor, comprising five steps. The method of claim 1, wherein the second process comprises: a first step of clearing a control counter for each grade; A second step of generating a random number by receiving the variable permission rate included in the transmitted control information; A third step of checking whether a modulo value of the random number is smaller than the variable permission rate of the control information; In the third step, if it is determined that the modulo value of the random number is 100 is not smaller than the variable permission rate of the control information, a fourth step of storing and terminating rejection information while rejecting entry of a call; A fifth step of acknowledging the incoming call and incrementing the control counter when it is determined that the modulo value of the random number is 100 less than the variable permission rate of the control information in the third step; A sixth step of clearing the rejection information; A seventh step of checking whether the variable permission rate of the control information is equal to the control counter; An eighth step of proceeding to the second step if it is determined in the seventh step that the variable permission rate of the control information is not equal to the control counter; And a ninth step of proceeding to the third process if it is determined that the variable permission rate of the control information is equal to the control counter in the seventh step.