KR20120126452A - Mobile communication system for protecting duplicated call processing and call processing method - Google Patents

Abstract

PURPOSE: A Mobile communication system for preventing overlapping call processing and a call processing method thereof are provided to prevent the overlapping call processing by not receiving a retransmitted request message for controlling a wireless resource when the overlapping processing of call processing corresponding to the retransmitted request message is normally performed in a wireless network controller. CONSTITUTION: If a reason that an RRC(Radio Resource Control) is connected is retransmission, a message analyzing unit delivers an extracted initial terminal identifier to a processing determination unit(S120). The processing determination unit determines an overlap of call processing by referring to a state database. The processing determination unit determines the normal operation of the call processing by referring to the state database(S130). When the overlap and the normal operation are determined, a message processing unit ignores a request message for RRC connection retransmitted from a mobile terminal(S140~S160). [Reference numerals] (AA) Start; (BB) Yes; (CC) No; (DD) End; (S100) Receiving an RRC connection request message again; (S110) Extracting an initial terminal identifier and an RRC connection reason; (S120) Transmitting again?; (S130) Determining call processing overlap and normal operation; (S140) Call processing overlap?; (S150) Normal operation?; (S160) Ignoring the RRC connection request message; (S170) Processing the RRC connection request message

Description

Mobile communication system for protecting duplicate call processing and its call processing method

The present invention relates to a mobile communication system and a call processing method for preventing duplicate call processing.

Recently, smart phones, which are intelligent terminals that add computer support functions such as internet communication and information retrieval to mobile phones, can be installed with desired applications.

Smart phones not only can directly access the Internet using the wireless Internet, but also can access the Internet in various ways by using various browsing programs, so that the load of mobile communication networks of domestic and overseas mobile communication providers is increasing rapidly.

When analyzing the call type of a smartphone, it is analyzed that a small volume of data calls is frequently generated. Frequent generation of such small volumes of data calls increases the call processing load of the base station and base station controller due to the increase in call processing messages.

The wireless environment is poor due to the increased network load caused by the use of smartphones due to the mobile network load caused by the use of existing mobile phones. There is a case that the call processing response is not sent down.

In this case, the mobile terminal retransmits the message for the unprocessed call processing request to the mobile communication system, and the mobile communication system reloads the call processing procedure for the retransmitted call processing request, thereby reducing the load on the mobile communication system. There is a problem that is weighted more.

The technical problem to be achieved by the present invention is that when the radio resource control request message is retransmitted from the mobile terminal, when the call processing corresponding to the retransmitted radio resource control request message is normally duplicated in the radio network controller, the retransmitted radio resource control The present invention provides a mobile communication system and a call processing method for preventing duplicate call processing by not accepting a request message.

Call processing method according to one feature of the present invention,

CLAIMS 1. A method for performing a process for a call transmitted from a mobile terminal by a wireless network controller controlling a wireless network access of a mobile terminal through a base station, comprising: determining whether call processing requested by the mobile terminal is overlapped; And if it is determined that the call processing is duplicated, performing the duplicated previous call processing without performing the requested call processing.

The determining of whether the call processing is duplicated may include: extracting identification information corresponding to the mobile terminal from the message for requesting call processing; Determining that call processing corresponding to the identification information is being performed; And when it is determined that the call processing is being performed, determining that the call processing is duplicated, and determining that the call processing is not duplicated when it is determined that the call processing is not being performed.

In addition, the performing of the duplicated previous call processing may include: determining whether the call processing is normally operated when it is determined that the call processing is duplicated; And if it is determined that the call processing is normally operated, performing a duplicate previous call processing without performing the call processing.

The call processing method may further include extracting a connection reason of the message from the message requesting the call processing before determining whether the call processing is duplicated; Determining whether the connection reason is retransmission; And determining whether the call processing is duplicated when the connection reason is retransmission.

The call processing request message is a radio resource control connection request message, the identification information is an initial UE identity, and the connection reason is a radio resource control connection reason. .

The call processing method may further include performing the call processing when it is determined that the call processing is not duplicated, when it is determined that the call processing does not operate normally or when the connection reason is not retransmission. do.

Mobile communication system according to another aspect of the present invention,

A mobile terminal for transmitting a message for requesting call processing to access a mobile communication network, and resending the message for requesting call processing when a setting message for the call request message is not received within a preset time; And a wireless network controller receiving a message requesting call processing from the mobile terminal through a base station, and performing the previous call processing without performing the requested call processing if it is determined that the requested call processing is duplicated. It includes.

The wireless network controller may include: a message analyzer extracting identification information corresponding to the mobile terminal and a message connection reason in the message, and outputting the identification information together with the message when the message connection reason is retransmission; A processing unit determining unit for determining whether call processing corresponding to the identification information output from the message analyzing unit is duplicated and whether the call processing is normally operated and outputting the result; And when the result of the normal operation indicates that the call processing is normally performed while the result of the duplication output from the process determining unit indicates that the call processing is repeatedly executed, the call processing. It includes a message processing unit that does not perform.

The message processing unit stores information on the call processing being processed, and the information on the call processing stores the initial terminal identifier corresponding to the mobile terminal requesting the call processing and information on whether the call processing is normally operated. It further includes a status database.

The processing unit may determine whether call processing is duplicated by checking whether there is a call processing being performed on the mobile terminal corresponding to the identification information according to whether the identification information is stored in the status database. Duplicate determination unit; And a normal operation determination unit determining whether call processing is normally performed by checking whether the call processing being performed on the mobile terminal corresponding to the identification information is normally operating through the status database.

The message processing unit may perform the requested call processing when it is determined by the message analysis unit that the message connection reason is not retransmission.

In addition, the message processing unit, if the result of the duplication indicates that the call processing is not executed repeatedly, or if the result of the normal operation indicates that the call processing is not operating normally, the requested It is characterized by performing call processing.

According to the present invention, when the radio resource control request message is retransmitted from the mobile terminal, when the call processing corresponding to the retransmitted radio resource control request message is normally duplicated in the radio network controller, the retransmitted radio resource control request message is transmitted. By not accepting, duplicate call processing can be prevented.

As such, since the call processing for the radio resource control request message retransmitted from the mobile terminal is not performed, an increase in load in the radio network controller can be avoided.

1 is a flowchart illustrating a call setup process in a general mobile communication network.
2 is a diagram illustrating a mobile communication system to which an embodiment of the present invention is applied.
FIG. 3 is a diagram illustrating a specific configuration of the wireless network controller shown in FIG. 2.
4 is a diagram illustrating an example of the status DB shown in FIG. 2.
5 is a flowchart illustrating a method for preventing duplicate call processing in a wireless network controller according to an embodiment of the present invention.

DETAILED DESCRIPTION Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings so that those skilled in the art may easily implement the present invention. The present invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. In the drawings, parts irrelevant to the description are omitted in order to clearly describe the present invention, and like reference numerals designate like parts throughout the specification.

Throughout the specification, when a part is said to "include" a certain component, it means that it can further include other components, without excluding other components unless specifically stated otherwise. Also, the terms " part, "" module," and " module "in the specification mean units for processing at least one function or operation and can be implemented by hardware or software or a combination of hardware and software .

In the present specification, a mobile terminal (MT) is a mobile station (MS), a terminal, a terminal, a subscriber station (SS), a portable subscriber station (PSS), a user equipment (User Equipment). It may also refer to a user equipment (UE), an access terminal (AT), and the like, and may include all or some functions of a mobile terminal, a subscriber station, a portable subscriber station, a user device, and the like.

In this specification, a base station (BS) is an access point (AP), a radio access station (RAS), a node B, a base transceiver station (BTS) Mobile Multihop Relay) -BS, and may include all or some of the functions of an access point, a radio access station, a Node B, a base transceiver station, and an MMR-BS.

First, a general call setup process in a mobile communication network will be described. Here, the mobile communication network will be described using WCDMA (Wideband Ccode Division Multiple Access) UTRAN (UMTS Terrestrial Radio Access Network) as an example.

1 is a flowchart illustrating a call setup process in a general mobile communication network.

Referring to FIG. 1, the mobile terminal 10 transmits a Radio Resource Control (RRC) connection request message (RRC Connection Request) through a base station Node B (20) to access a mobile communication network. Network Controller 30) (S10).

Thereafter, the base station controller 30 transmits a radio link setup request message to the base station 20 to establish a wireless link with the base station 20 (20), and the base station 20 After setting the requested radio link, a radio link setup response is transmitted to the base station controller 30 (S30).

Next, the base station controller 30 sends a message for configuring AAL2 Access Link Control Application Part (ALCAP), which is a protocol for allocating and releasing a channel ID of AAL2 (AAL2) for Asynchronous Transfer Mode (ATM) setting. The base station 20 transmits an ERQ (Establish Request Message) to the base station 20 (S40), and the base station 20 performs an AAL2 ALCAP setup procedure and then sends an AAL2 ALCAP setup confirmation message (AAL2 / ECF (Establish Confirm Message)). Transfer to 30 (S50).

Thereafter, the base station controller 30 and the base station 20 perform a frame synchronization process using the established radio link and AAL2. To this end, the base station controller 30 transmits a downlink synchronization message (DL Synchronization (CFN (Connection Fram Number))) to the base station 20 (S60), and the base station 20 transmits an uplink synchronization message (UL Synchronization (ToA). (Timing Adjust)) is transmitted to the base station controller 30 (S70).

When the frame synchronization process is normally performed, the base station controller 30 transmits a radio resource control connection setup message (RRC Connection Setup) to the mobile terminal 10 through the base station 20 (S80).

When the RRC connection establishment message is received from the base station controller 30, the mobile terminal 10 sets up a radio bearer based on the radio resource configuration information specified in the RRC connection establishment message, and an RRC connection setup complete message (RRC Connection Setup Complete). Is transmitted to the base station controller 30 through the base station 20 to terminate the initial call processing procedure for accessing the mobile communication network (S90).

In the meantime, the wireless environment between the mobile terminal 10 and the base station 20 or the base station controller 30 is not good or the overload of the base station 20 or the base station controller 30 is in progress. Due to this, the base station controller 30 may not transmit the RRC connection setup message S80 to the mobile terminal 10 or the base station controller 30 may transmit but the mobile terminal 10 may not receive it.

In this case, the mobile terminal 10 drives the timer at the same time as transmitting the RRC connection setup message to the base station controller 30 in the step (S10), until the timer expires RRC from the base station controller 30 Since the connection establishment message is not received, the mobile terminal 10 retransmits the RRC connection establishment message transmitted in step S10 to the base station controller 30. Here, the expiration time set in the timer and the number of retransmissions may be limited to a specific value.

Accordingly, although the base station controller 30 performs or performs the call setup process S20 to S70 according to the RRC connection request requested in the step S10 from the mobile terminal 10, the mobile terminal 10 Due to the RRC connection request retransmitted from the above, the above call setup process (S20 to S70) must be performed again.

As described above, it is necessary to prevent the load on the mobile communication system from being further increased due to the duplicate call processing for performing the same call setup again.

Now, a mobile communication system for preventing duplicate call processing and a method for preventing the same according to an embodiment of the present invention will be described in detail.

2 is a diagram illustrating a mobile communication system to which an embodiment of the present invention is applied.

As shown in FIG. 2, a mobile communication system according to an embodiment of the present invention includes a radio access network (RAN) 100 and a core network 200.

In the mobile communication system, the mobile terminal 300 is connected to the core network 200 through the wireless access network 100. That is, the mobile terminal 300 is a portable communication device capable of performing wireless communication using a mobile communication system. An example of the mobile terminal 300 may be a mobile phone, a smart phone, or the like. However, embodiments of the mobile terminal 300 are not limited to a mobile phone or a smart phone, as the boundary between digital devices is flexible due to the development of digital technology. Accordingly, the mobile terminal 300 may be implemented with other types of portable digital devices, such as personal digital assistants (PDAs) or notebook computers.

The wireless access network 100 may cover a geographical area that may be divided into cells, which are wireless communication areas that the base station 110 can support. Although the UTRAN is described as an embodiment of the radio access network 100 as an example, the embodiment of the present invention is not limited thereto, but may be applied to various types of mobile communication systems.

The radio access network 100 includes a base station (node-B) 110 and a radio network controller (RNC) 120.

The base station 110 serves as a contact point between the wireless access network 100 and the mobile terminal 300.

The wireless network controller 120 manages wired and wireless channels, protocol matching processing of the mobile terminal 300 and the base station 110, soft handoff processing, general packet radio service (GPRS) connection, system loading, Corresponds to a base station controller that performs functions such as fault management.

In the embodiment of the present invention, when the RRC connection request message is received from the mobile terminal 300 through the base station 110, the wireless network controller 120, the mobile terminal 300 among the message internal information included in the RRC connection request message Extract identification information for verifying, and determine whether or not the ongoing call processing is duplicated for the mobile terminal 300 based on the extracted identification information, and if there is a duplicate call processing and the call processing is normal, received from the above Ignore the RRC connection request message and perform the existing call processing procedure. In this case, the identification information for identifying the mobile terminal 300 is, for example, "Initial UE Identity" among the message internal information included in the RRC connection request message, and the initial terminal identifier transmits the RRC connection request message. Means a unique identifier that can identify one mobile terminal (300).

In addition, the wireless network controller 120 extracts "Establishment Cause (RRC connection reason)", which is an internal information indicating the reason why the mobile terminal 300 transmits the RRC connection request message, from the RRC connection request message to determine the call processing duplication. Please refer to. For example, only when the RRC connection reason is a reason for retransmitting the RRC connection request message due to timer expiration, the operation for determining whether call processing is duplicated may be performed.

Hereinafter, with reference to the drawings will be described three configurations and operation of the wireless network controller 120 according to an embodiment of the present invention. Here, only the configuration of the wireless network controller 120 as an object in the embodiment of the present invention will be described, and for the configuration of performing the signal relay function between the base station 110 and the core network 200, the convenience of explanation will be provided. Omitted.

FIG. 3 is a diagram illustrating a specific configuration of the wireless network controller 120 shown in FIG. 2.

As shown in FIG. 3, the wireless network controller 120 includes a transmitter 121, a receiver 122, a message analyzer 123, a database DB 124, and a process determination unit 125. , And a message processing unit 126.

The transmitter 121 receives a message output from the message processor 126, for example, an RRC connection setup message, and transmits the message to the base station 110.

The receiver 122 receives and outputs a message transmitted from the base station 110, for example, an RRC connection request message.

The message analyzer 123 receives the message output from the receiver 122 and performs analysis. In particular, when the message output from the receiver 122 is an RRC connection request message, the message analyzer 123 analyzes the RRC connection request message. That is, the message analyzer 123 extracts an initial UE identity and an RRC establishment cause, which are internal information of the RRC connection request message, and the RRC connection reason expires a timer in the mobile terminal 300. Determine the case of retransmission due to. When the RRC connection reason is retransmission due to timer expiration or the like in the mobile terminal 300, the message analyzer 123 transmits the extracted initial terminal identifier to the process determination unit 124. However, if the reason for the RRC connection is not retransmission due to timer expiration or the like in the mobile terminal 300, the corresponding RRC connection request message is transferred to the message processing unit 126 as it is.

In addition, even if the message output from the receiver 122 is not an RRC connection request message, the message analyzer 123 transfers the message to the message processor 126 as it is.

The status DB 124 stores information on call processing being processed by the message processing unit 126. That is, as shown in FIG. 4, the current state DB 125 stores the message processing unit 126 for information on the call processing that is currently being processed, and the mobile terminal requesting the call processing for the call processing ( An initial terminal identifier corresponding to 300) and information on whether the call processing is normally operated are stored.

The process determining unit 125 receives the initial terminal identifier of the RRC connection request message transmitted from the message analyzing unit 123 and refers to the mobile terminal 300 corresponding to the initial terminal identifier with reference to the current status DB 124. It is determined whether the processing is duplicated, and if there is duplicate call processing, it is determined whether the call processing is normally operated.

The process determining unit 125 transmits the call processing overlapping determination result and the call processing normal operation determining result to the message processing unit 126.

For the operation, the process determination unit 125 includes a duplication determination unit 1251 and a normal operation determination unit 1252.

The duplicate determination unit 1251 is a call currently being performed for the mobile terminal 300 corresponding to the initial terminal identifier according to whether the initial terminal identifier transmitted from the message analyzer 123 is stored in the status DB 124. It checks whether there is a process and judges whether or not call processing is duplicated. That is, the overlap determination unit 1251 determines that the call processing is duplicated if the initial terminal identifier transmitted from the message analysis unit 123 is stored in the current state DB 124, otherwise, the duplicate determination unit 1251 is not a duplicate of call processing. To judge.

The normal operation determination unit 1252 checks whether the call processing currently being performed for the mobile terminal 300 corresponding to the initial terminal identifier is operating normally or abnormally through the status DB 125 to determine the call processing. Determine whether it operates normally. That is, the normal operation determination unit 1252 determines whether the call processing is normal by referring to the normal operation field of the status DB 124 for the call processing corresponding to the initial terminal identifier.

The message processor 126 may determine whether the RRC connection request message retransmitted from the mobile terminal 300 through the receiver 122 according to a result of determining whether or not the call processing is transmitted from the processor 125 determines whether the call is duplicated or not. Determine whether to accept. That is, the message processing unit 126 indicates that the call processing delivered from the process determining unit 125 indicates whether the call processing is duplicated and that the call processing unit 126 indicates that the call processing is duplicated. Since it is not necessary to perform processing on the RRC connection request message retransmitted by the mobile terminal 300 through, the call processing stored in the status DB 124 is ignored, ignoring the RRC connection request message retransmitted by the mobile terminal 300. Allow the procedure to be performed.

Hereinafter, the operation of the radio network controller 120 will be described with reference to FIG. 5.

First, the mobile terminal 300 transmits an RRC connection request message to the radio network controller 120 through the base station 110 in order to access the mobile communication network, and then set a timer of the mobile terminal 300, for example, a T300 timer. It is assumed that the RRC connection request message is not transmitted from the radio network controller 120 until the time expires, so that the RRC connection request message is retransmitted to the radio network controller 120. Therefore, the first RRC connection request message transmitted by the mobile terminal 300 is currently in the process of call processing in the wireless network controller 120, and this call processing will be described as assuming that the normal operation is stored in the current state DB 124. .

The wireless network controller 120, that is, the receiver 122 of the wireless network controller 120 receives the RRC connection request message retransmitted from the mobile terminal 300 through the base station 110 and transmits the received RRC connection request message to the message analyzer 123. (S100).

The message analyzer 123 extracts the initial terminal identifier and the RRC connection reason from the RRC connection request message transmitted from the receiver 122 (S110), and the RRC connection reason is retransmitted due to the expiration of a timer in the mobile terminal 300. It is determined whether or not the recognition (S120).

If it is determined in step S120 that the RRC connection reason is retransmission, the message analyzing unit 123 transfers the initial terminal identifier extracted in step S110 to the processing whether determiner 124, and processes the message. The determination unit 125 receives the initial terminal identifier of the RRC connection request message transmitted from the message analyzer 123 and checks whether there is a call processing matching the initial terminal identifier by referring to the current status DB 124. If there is a call processing that matches the initial terminal identifier, and if there is a call processing that matches the initial terminal identifier, it is determined whether the call processing that matches the initial terminal identifier is normal by referring to the current status DB 124. The determination result and the normal operation determination result are transmitted to the message processing unit 126 (S130).

Therefore, the message processing unit 126 determines whether call processing is duplicated according to the result of determining whether the call processing is overlapped from the processing unit 125 (S140). It is determined whether the call processing is normally operated according to the determination result of the normal operation of the call processing transmitted from 125 (S150).

If it is determined in the above step that the call processing is operating normally, the message processing unit 126 ignores the RRC connection request message retransmitted from the mobile terminal 300 received through the receiving unit 122 (S160).

On the other hand, if it is determined in step S120 that the RRC connection reason is not retransmission, call processing for the RRC connection request message received through the receiver 122 must be performed, and thus the message analyzer 123 connects the corresponding RRC connection. The request message is transferred to the message processing unit 126 to perform a corresponding call processing (S170).

In addition, when it is determined in step S140 that the call processing is not duplicate, the message processing unit 126 performs a call processing on the RRC connection request message transmitted from the processing determination unit 125 (S170).

In addition, even when the call processing is not operating normally in step S150 and is determined to be an abnormal operation, the message processing unit 126 performs a call processing on the RRC connection request message transmitted from the processing determining unit 125. (S170).

As such, when the wireless network controller 120 determines that the RRC connection request message retransmitted from the mobile terminal 300 is a duplicate call processing and normal call processing in the wireless network controller 120, the retransmitted RRC By not accepting the connection request message, an increase in load due to call processing for the RRC connection request message retransmitted from the mobile terminal 300 may be prevented.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is to be understood that the invention is not limited to the disclosed exemplary embodiments, It belongs to the scope of right.

Claims (13)

A method for performing a process for a call transmitted from a mobile terminal by a wireless network controller controlling a wireless network connection of a mobile terminal through a base station, the method comprising:
Determining whether the call processing requested by the mobile terminal is duplicated; And
If it is determined that the call processing is duplicated, performing the previous previous call processing without performing the requested call processing;
Call processing method comprising a. The method of claim 1,
Determining whether or not the call processing is duplicated,
Extracting identification information corresponding to the mobile terminal from the message for requesting call processing;
Determining that call processing corresponding to the identification information is being performed; And
If it is determined that the call processing is being performed, determining that the call processing is duplicated, and determining that the call processing is not duplicated when it is determined that the call processing is not being performed.
Call processing method comprising a. The method of claim 2,
Performing the duplicated previous call processing,
If it is determined that the call processing is duplicated, determining whether the call processing is normally operated; And
If it is determined that the call processing is normally operated, performing a duplicate previous call processing without performing the call processing;
Call processing method comprising a. The method of claim 3,
Before the step of determining whether the call processing is duplicated,
Extracting a connection reason of the message from the message requesting the call processing;
Determining whether the connection reason is retransmission;
Determining whether the call processing is duplicated if the connection reason is retransmission;
Call processing method comprising a. 5. The method of claim 4,
The call processing request message is a radio resource control connection request message,
The identification information is an initial UE identity, and the connection reason is a radio resource control connection cause (Establishment Cause), characterized in that. 5. The method of claim 4,
When it is determined that the call processing is not duplicated, when it is determined that the call processing does not operate normally or when the connection reason is not retransmission, the call processing method is performed. A mobile terminal for transmitting a message for requesting call processing to access a mobile communication network, and resending the message for requesting call processing when a setting message for the call request message is not received within a preset time; And
A wireless network controller that receives a message requesting call processing from the mobile terminal through a base station, and performs duplicate previous call processing without performing the requested call processing when it is determined that the requested call processing is duplicated.
Mobile communication system comprising a. The method of claim 7, wherein
The wireless network controller,
A message analyzer extracting identification information corresponding to the mobile terminal and a message connection reason in the message, and outputting the identification information together with the message when the message connection reason is retransmission;
A processing unit determining unit for determining whether call processing corresponding to the identification information output from the message analyzing unit is duplicated and whether the call processing is normally operated and outputting the result; And
If the result of the duplication output from the processing state judging unit indicates that the call processing is executed repeatedly, the result of the normal operation indicates that the call processing is operating normally. Message processing unit that does not perform
Mobile communication system comprising a. 9. The method of claim 8,
The message processing unit stores information on the call processing being processed, and the information on the call processing is a current state of storing the initial terminal identifier corresponding to the mobile terminal requesting the call processing and information on whether the call processing is normally operated. A mobile communication system further comprising a database. 10. The method of claim 9,
The process determination unit,
A duplication determination unit for determining whether call processing is duplicated by checking whether there is a call processing being performed on the mobile terminal corresponding to the identification information according to whether the identification information is stored in the status database; And
The normal operation determination unit which determines whether the call processing is normally performed by checking through the status database whether the call processing being performed on the mobile terminal corresponding to the identification information is operating normally.
Mobile communication system comprising a. 10. The method of claim 9,
The message processing unit performs the requested call processing when it is determined by the message analyzing unit that the message connection reason is not retransmission. 10. The method of claim 9,
The message processing unit,
If the result of the duplication indicates that the call processing is not executed repeatedly, or if the result of the normal operation indicates that the call processing is not normally operating, the requested call processing is performed. Mobile communication system. 10. The method of claim 9,
The call processing request message is a radio resource control connection request message,
The identification information is an initial UE identity and the connection reason is a radio resource control connection cause (Establishment Cause).

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