KR101127662B1 - Method for improving call completion rate and mobile switching center using the same - Google Patents

Abstract

The present invention relates to a method for improving call completion rate and a mobile switching center performing the same.

The method for improving call completion rate according to the present invention is a method for improving a call completion rate for a terminal that is registering a location from a first mobile switching center to a second mobile switching center, the method comprising: (a) call processing for the terminal from the first mobile switching center; Receiving a request message, (b) generating a timer with a predetermined time after receiving the call processing request message, and (c) when the timer expires, the terminal is located in the second mobile switching center. Determining whether it is registered and processing a call to the terminal.

According to the present invention, it is possible to increase the completion rate of the requested call for the terminal in the position registration.

 Call completion rate, IMP, location registration

Description

METHOD FOR IMPROVING CALL COMPLETION RATE AND MOBILE SWITCHING CENTER USING THE SAME}

The present invention relates to a method for improving call completion rate and a mobile switching center performing the same.

When the terminal moves from the first mobile switching center to the second mobile switching center, a location registration procedure is performed for the terminal. When the location registration procedure from the first mobile switching center to the second mobile switching center is completed, the call requested for that terminal is then routed to the second mobile switching center. However, while the location registration procedure with the second mobile switching center is not completed, there is a problem that the call requested for the terminal is routed to the first mobile switching center.

At this time, the first mobile switching center may increase the completion rate of the call by routing the call requested for the terminal to the second mobile switching center where the terminal is registered. However, when the call to the terminal is routed from the first mobile switching center to the second mobile switching center in this way, the location registration of the terminal is not completed in the second mobile switching center. In this case, the second mobile switching center determines that the terminal does not exist in the second mobile switching center to reject the call for the terminal. This causes a problem that the completion rate of the call for the terminal is lowered.

Accordingly, an object of the present invention is to provide a method for increasing the completion rate of a call requested for a terminal that is registering a location.

The objects of the present invention are not limited to the above-mentioned objects, and other objects and advantages of the present invention, which are not mentioned above, can be understood by the following description, and more clearly by the embodiments of the present invention. It will also be readily apparent that the objects and advantages of the invention may be realized and attained by means of the instrumentalities and combinations particularly pointed out in the appended claims.

Method for improving the call completion rate according to an embodiment of the present invention for solving the above problems, in the method for improving the completion rate of the call for the terminal that is registering the location from the first mobile switching station to the second mobile switching station, (a) the Receiving a call processing request message for the terminal from a first mobile switching center; (b) after receiving the call processing request message, generating a timer having a preset time; and (c) if the timer is terminated. Determining whether the terminal is registered with the second mobile switching center and processing a call to the terminal.

According to another embodiment of the present invention, a mobile switching center includes a transceiver for receiving a call processing request message for a terminal moved from a first mobile switching station, a location registration processing unit for performing a location registration procedure for the terminal, and the call processing request. Generating a timer having a predetermined time after receiving the message; and determining whether the terminal is registered in the location when the timer expires, and including an IMP processing unit for processing a call to the terminal, wherein the call processing request message includes: The first mobile switching center transmits the message, and the transceiver unit transmits and receives a message necessary for the location registration processing unit to perform the location registration procedure or for the IMP processing unit to process a call to the terminal.

The foregoing and other objects, features and advantages of the present invention will become more apparent from the following detailed description of the present invention when taken in conjunction with the accompanying drawings, in which: There will be. In the following description, well-known functions or constructions are not described in detail since they would obscure the invention in unnecessary detail. Hereinafter, a preferred embodiment of the present invention will be described in detail with reference to the accompanying drawings.

According to the present invention, it is possible to increase the completion rate of the requested call for the terminal in the position registration.

The following merely illustrates the principles of the invention. Therefore, those skilled in the art, although not explicitly described or illustrated herein, can embody the principles of the present invention and invent various devices that fall within the spirit and scope of the present invention. In addition, all conditional terms and embodiments listed herein are in principle clearly intended to be understood solely for the purpose of understanding the concept of the invention and are not to be limited to the specifically listed embodiments and states. do.

It is also to be understood that the detailed description, as well as the principles, aspects and embodiments of the invention, as well as specific embodiments thereof, are intended to cover structural and functional equivalents thereof. In addition, these equivalents should be understood to include not only equivalents now known, but also equivalents to be developed in the future, that is, all devices invented to perform the same function regardless of structure.

Thus, for example, it should be understood that the block diagrams herein represent a conceptual view of example circuitry embodying the principles of the invention. Similarly, all flowcharts, state transitions, pseudocodes, and the like are understood to represent various processes performed by a computer or processor, whether or not the computer or processor is substantially illustrated on a computer readable medium and whether the computer or processor is clearly shown. Should be.

The functionality of the various elements shown in the figures, including functional blocks represented by a processor or similar concept, can be provided by the use of dedicated hardware as well as hardware capable of executing software in association with appropriate software. When provided by a processor, the functionality may be provided by a single dedicated processor, by a single shared processor or by a plurality of individual processors, some of which may be shared.

In addition, the explicit use of terms presented in terms of processor, control, or similar concept should not be interpreted exclusively as a citation to hardware capable of running software, and without limitation, ROM for storing digital signal processor (DSP) hardware, software. (ROM), RAM, and non-volatile memory are to be understood to implicitly include. Other hardware for the governor may also be included.

In the claims of this specification, components expressed as means for performing the functions described in the detailed description include all types of software including, for example, a combination of circuit elements or firmware / microcode, etc. that perform the functions. It is intended to include all methods of performing a function which are combined with appropriate circuitry for executing the software to perform the function. The invention, as defined by these claims, is equivalent to what is understood from this specification, as any means capable of providing such functionality, as the functionality provided by the various enumerated means are combined, and in any manner required by the claims. It should be understood that.

The above objects, features and advantages will become more apparent from the following detailed description taken in conjunction with the accompanying drawings, whereby those skilled in the art may easily implement the technical idea of the present invention. There will be. In the following description, well-known functions or constructions are not described in detail since they would obscure the invention in unnecessary detail. Hereinafter, a preferred embodiment of the present invention will be described in detail with reference to the accompanying drawings.

The present invention routes a call requested for a terminal registering a location from a first mobile switching center to a second mobile switching center to a second mobile switching center, and determines whether the terminal exists in the second mobile switching center after a predetermined time has elapsed. In addition, the completion rate of the call for the terminal can be increased.

1 is a view showing the configuration of a communication system for explaining a call completion rate improvement method according to an embodiment of the present invention.

Referring to FIG. 1, a communication system includes a mobile station (MS) 100, a first RNS 110, a first mobile switching center MSC 115, and a second RNS 120. , A second mobile switching center (second MSC: 125), and a home location register (HLR) 130.

The RNS 110 and 120 refer to a base station, which is an entity necessary for the MSC and the terminal 100 to communicate with each other. The RNS 110 and 120 may include one Radio Network Controller (RNC) and one or more NodeBs.

Mobile switching centers (MSCs 115, 125) provide an interface between a wireless system and a fixed network. The mobile switching center (MSC) transmits and receives a control signal (Control Signal) with the terminal through the RNS, allocates radio resources to the terminal and performs a location registration procedure according to the movement of the terminal.

The home location register (HLR) 130 refers to a database that stores and manages information about a terminal. The information on the terminal may include identification information of the terminal, location information of the terminal, additional service information of the terminal subscriber, and the like. Information about a terminal stored in the subscriber location register 130 is stored in a visitor location register (VLR) of a mobile switching center (MSC) that manages an area where the terminal is located when the terminal registers its location. The visitor location register (VLR) may be located within the mobile switching center or may be implemented separately from the mobile switching center.

2 and 3 are views for explaining a call completion rate improvement method according to an embodiment of the present invention.

Referring to FIG. 1, when the terminal 100 moves from an area managed by the first mobile switching center 115 to an area managed by the second mobile switching center 125, the first mobile switching station with respect to the terminal 100 ( The location registration procedure from 115 to the second mobile switching center 125 is performed. 2 is an example of a location registration procedure for the terminal 100.

Referring to FIG. 2, the terminal 100 transmits a message for requesting location registration (hereinafter, referred to as a location registration request message) to the second mobile switching center 125 (200).

Upon receiving the location registration request message 200, the second mobile switching center 125 transmits information of the terminal 100, for example, International Mobile Subscriber Identity (IMSI) and International Mobile Equipment Identity (IMEI) information. Request (115) (202).

Upon receiving the response message 204 for the message 202, the second mobile switching center 125 transmits a message to the terminal 100 to confirm whether the terminal 100 is a stolen terminal (206).

After confirming the identity of the terminal 100 by transmitting and receiving messages 202 to 208, the second mobile switching center 125 uses the authentication information for the terminal 100 stored in the subscriber location register 130. Through the message No. 210 to No. 216, the terminal 100 performs an authentication procedure.

After performing the authentication procedure for the terminal 100, the second mobile switching center 125 transmits message 218 to register the new location information for the terminal 100 with the subscriber location register 130. In order to register with the subscriber location register 130 that the terminal 100 is located within the area of the second mobile switching center 125.

Upon receiving the new location information 218 for the terminal 100, the subscriber location register 130 requests to delete the location information of the terminal 100 stored in the visitor location register (VLR) of the first mobile switching center 115. Message 220 to the first mobile switching center 115.

The subscriber location register 130 that has received the response message 222 for the message 220 transmits various kinds of information about the terminal 100 stored by the user 130 to the visitor location register of the second mobile switching center 125. (VLR) (224,226).

The second mobile switching center 125, having received the response message 228 to the message 218 from the subscriber location register 130, sends a message notifying that the location registration requested by the terminal 100 has been accepted. 230). At this time, if the transmission including the TMSI (Temporary Mobile Subscriber Identity) of the terminal 100, and receives a response message (232) for this from the terminal 100.

After completing the location registration procedure as shown in FIG. 2, the call requested for the terminal 100 is then routed to the second mobile switching center 125 instead of the first mobile switching center 115. However, the call requested for the terminal 100 may be routed to the first mobile switching center 115 while the location registration procedure to the second mobile switching center 125 is not completed. In this case, in order to increase the completion rate of the call, the first mobile switching center 115 may route the call requested for the terminal 100 to the second mobile switching center 125 where the terminal 100 is registering a location.

For example, referring to FIGS. 2 and 3, after receiving a call to the terminal 100, the first mobile switching center 115 checks whether the terminal 100 exists in an area managed by the 115. While paging 300 to the terminal 100 through the first RNS 110, the "Cancel Location" message 220 of FIG. 2 may be received. The first mobile switching center 115 transmits the IMP message 302 of FIG. 3 using the address of the second mobile switching center 125 included in the "Cancel Location" message 220 to thereby call the terminal 100. May be routed to the second mobile switching center 125.

After receiving the IMP message 302, the second mobile switching center 125 checks whether the terminal 100 is registered with the visitor location register (VLR) of the second mobile switching center 125 (304). When the terminal 100 is registered in the visitor location register (VLR) of the second mobile switching center 125, the second mobile switching center 125 uses the location information of the terminal 100 stored in the visitor location register (VLR). Paging 306 to the terminal 100 through the second RNS (120).

Upon receiving the paging response 308 from the terminal 100 via the second RNS 120, the second mobile switching center 125 sends a response message 310 to the IMP message 302 to the first mobile switching station 115. To transmit. Since the response message 310 to the IMP message 302 includes a new subscriber station number (MSRN) including the location of the second mobile switching center 125, the first mobile switching center 115 is a terminal. The call for 100 is routed to the second mobile switching center 125 (312). Since the call for the terminal 100 registered in the second mobile switching center 125 has been routed to the second mobile switching center 125, the call connection to the terminal 100 is completed using the general call processing procedure. Messages 314 to 322 are general call processing procedures and are not related to the main contents of the present invention, and thus detailed description thereof will be omitted.

The terminal 100 is registered in the visitor location register (VLR) of the second mobile switching center 125 because the location registration for the terminal 100 is not completed because the IMP message 302 is received from the first mobile switching center 115. If not, the second mobile switching center 125 determines that the terminal 100 does not exist in the second mobile switching center 125 (304). If it is determined that the terminal 100 does not exist in the second mobile switching center 125, the second mobile switching center 125 may reject the call to the terminal 100 or may not be able to access all the mobile terminal 125. Paging to the base station. As a result, there is a problem that the completion rate of the call to the terminal 100 is lowered.

Therefore, the second mobile switching center 125 transmits a call processing request message for the terminal 100 from the first mobile switching station 115, for example, an IMP message 302, during the location registration procedure for the terminal 100. Upon reception, the completion rate of the call to the terminal 100 may be increased by performing the determination after the predetermined time has elapsed, instead of immediately determining whether the terminal 100 exists in the second mobile switching center 125 (304).

This will be described in detail with reference to FIGS. 1 to 3.

When the second mobile switching center 125 receives the location registration request message 200 from the terminal 100, the second mobile switching center 125 turns on a flag (hereinafter, referred to as a location registration flag) indicating whether location registration is in progress. When the second mobile switching center 125 receives the call processing request message for the terminal 100 from the first mobile switching center 115, for example, the IMP message 302 while the location registration flag is 'ON'. A timer that has set a predetermined time is started (304).

When the timer expires, the second mobile switching center 125 determines whether the terminal 100 is registered in the second mobile switching center 125 to process the call to the terminal 100. In one embodiment, when the timer expires, the second mobile switching center 125 checks whether information about the terminal 100 is registered in the visitor location register (VLR) (304). After the call is connected to the terminal 100, if the procedure is not registered, the procedure for limiting the call to the terminal 100 or paging all base stations in the second mobile switching center 125 is performed.

In addition, when the terminal 100 is registered with the second mobile switching center 125 before the timer expires, the second mobile switching center 125 connects the call to the terminal 100 without waiting until the timer expires. Can be performed.

For example, the second mobile switching center 125 may monitor whether information of the terminal 100 is registered in the visitor location register VLR after the timer is activated. If the information of the terminal 100 is registered in the visitor location register (VLR) before the timer expires, the call connection procedure for the terminal 100 is immediately performed. Alternatively, when the location registration for the terminal 100 is completed and the value of the location registration flag is changed to 'OFF', the second mobile switching center 125 may transmit the information of the terminal 100 registered in the visitor location register VLR. A procedure for connecting a call to the terminal 100 can be performed by using the method.

4 is a block diagram showing the configuration of a mobile switching center according to an embodiment of the present invention.

Referring to FIG. 4, the mobile switching center may include a transceiver 410, a location registration processor 420, an IMP processor 450, and a timer 460.

The transceiver 410 is a call processing request message for the terminal 100 from the first mobile switching center 115 that was registered before the terminal 100 moved to the mobile switching center of FIG. 4, for example, an IMP message ( 302 may be received. In addition, the transceiver 410 is a message required for the location registration processing unit 420 to perform a location registration procedure for the terminal 100 or for the IMP processing unit 450 to process a call to the terminal 100 according to the IMP message. Can transmit and receive.

The location registration processing unit 420 performs a location registration procedure for the terminal 100 that has moved to the mobile switching center of FIG. 4. For example, the location registration procedure as shown in FIG. 2 may be performed.

If the transceiver 410 receives a call processing request message such as the IMP message 302 while the location registration processor 420 performs the location registration procedure for the terminal 100, the IMP processor 450 receives a preset time. Create a timer 460 with. When the timer 460 ends, the terminal 100 determines whether the location is registered and processes the call to the terminal 100. That is, when the timer 460 expires, the IMP processing unit 450 connects the call to the terminal 100 when the terminal 100 is registered in the location, and the terminal when the terminal 100 is not registered in the location. The call to 100 may be restricted or paged to all base stations connected to the mobile switching center of FIG. If the terminal 100 is registered in position before the timer 460 expires, the terminal 100 connects the call to the terminal 100 at the time when the terminal 100 is registered in the location without having to wait until the timer 460 ends. Can be.

As described above, the IMP processing unit 450 generates a timer 460 having a preset time when a call processing request message such as the IMP message 302 is received while the location registration procedure for the terminal 100 is performed. do. Hereinafter, an embodiment of determining by using a location registration flag that a location registration procedure for the terminal 100 is being performed will be described.

The transceiver 410 may receive the location registration request message 200 from the terminal 100.

The location registration processing unit 420 'ON' the location registration flag 430 when the transceiver 410 receives the location registration request message 200 from the terminal 100. When the location registration flag 430 is 'ON', it indicates that the location registration procedure is in progress, and when it is 'OFF', it indicates that the location registration procedure is completed.

The mobile switching center may further include a visitor location register (VLR) 440.

The visitor location register 440 stores information about the terminal 100 when the location registration processing unit 420 completes location registration for the terminal 100. Information about the terminal 100 is as described above.

The IMP processor 450 operates the timer 460 by setting a predetermined time when the transceiver 410 receives the IMP message 302 while the location registration flag 430 is 'ON'. When the timer 460 expires, the IMP processor 450 checks whether the terminal 100 is registered in the visitor location register 440, and if so, the IMP processing unit 450 connects the call to the terminal 100. If not registered, it performs a procedure of limiting a call to the terminal 100 or paging all base stations in the mobile switching center.

If the terminal 100 is registered with the visitor location register 440 before the timer 460 expires, the IMP processor 450 connects the call to the terminal 100 without waiting until the timer 460 expires. Can be performed. An example of this is as described above.

The method of the present invention as described above may be embodied as a program and stored in a computer-readable recording medium (such as a CD-ROM, a RAM, a ROM, a floppy disk, a hard disk, or a magneto-optical disk). Since this process can be easily implemented by those skilled in the art will not be described in more detail.

The present invention described above is capable of various substitutions, modifications, and changes without departing from the technical spirit of the present invention for those skilled in the art to which the present invention pertains. It is not limited by the drawings.

The present invention can be used to improve the completion rate of a requested call for a terminal in the position registration.

1 is a view showing the configuration of a communication system for explaining a call completion rate improvement method according to an embodiment of the present invention.

2 is a view for explaining a call completion rate improvement method according to an embodiment of the present invention.

3 is a view for explaining a call completion rate improvement method according to an embodiment of the present invention.

4 is a block diagram showing the configuration of a mobile switching center according to an embodiment of the present invention.

Claims (10)

A method for improving the completion rate of a call for a terminal that is registering a location from a first mobile switching center to a second mobile switching center, (a) receiving a call processing request message for the terminal from the first mobile switching center; (b) generating a timer with a preset time after receiving the call processing request message; And (c) when the timer expires, determining whether the terminal is registered with the second mobile switching center and processing a call to the terminal. The method of claim 1, In step (a), (a1) receiving a location registration request message from the terminal; (a2) turning on a location registration flag upon receiving the location registration request message; And (a3) receiving a call processing request message for the terminal from the first mobile switching station, with the location registration flag on; And the location registration flag is turned off when location registration for the terminal is completed. The method of claim 1, Step (c) is, If the terminal is registered with the second mobile switching center, the call is connected to the terminal. If the terminal is not registered with the second mobile switching center, the call to the terminal is restricted or the second mobile switching center is connected. Paging all base stations in the call. The method of claim 1, (d) if the terminal is location registered with the second mobile switching center before the timer expires, further comprising: connecting a call to the terminal at the time when the terminal is location registered with the second mobile switching center. How to improve call completion rate. The method according to claim 3 or 4, If the terminal is registered with the second mobile switching center, And the information on the terminal is registered in the visitor location register (VLR) of the second mobile switching center. A transceiver for receiving a call processing request message for a terminal moved from a first mobile switching center; A location registration processing unit which performs a location registration procedure for the terminal; And Generating a timer having a predetermined time after receiving the call processing request message, and determining whether the terminal is registered in a location when the timer expires, and including an IMP processing unit configured to process a call to the terminal; The call processing request message is transmitted by the first mobile switching center, And the transmitting and receiving unit transmits and receives a message necessary for the location registration processing unit to perform the location registration procedure or the IMP processing unit processes a call to the terminal. The method of claim 6, The transceiver unit receives a location registration request message sent by the terminal, The location registration processing unit turns on a location registration flag upon receiving the location registration request message. The call processing request message is received while the location registration flag is ON. And the location registration flag is turned off when location registration for the terminal is terminated. The method of claim 6, The IMP processing unit, Connecting the call to the terminal when the terminal is location registered, and if the terminal is not location registered, limiting or paging the call to the terminal to all base stations to which it is connected. The method of claim 6, The IMP processing unit, And if the terminal is location registered before the timer expires, connecting the call to the terminal at the time the terminal is location registered. 10. The method according to claim 8 or 9, Further includes a visitor location register (VLR), And when the terminal is registered in location, information about the terminal is registered in the visitor location register (VLR).

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