KR20110118037A - Call processing method and mobile communication system - Google Patents

Abstract

An incoming call processing method and a mobile communication system are disclosed. When the mobile communication system that processes the incoming call to the called terminal fails in an attempt to make an incoming connection according to the incoming call request to the called terminal, the mobile communication system transmits a call resumption request (RCH) from the first called exchange to the calling exchange. The exchange may acquire the location information of the called terminal by querying the home location register, and retry the incoming call request to the second called exchange to which the called terminal is connected by using the same.

Description

Call processing method and mobile communication system

The present invention relates to a mobile communication system, and more particularly, to an incoming call processing method in an area where location registration of a terminating terminal overlaps and a mobile communication system for processing the same.

In general, when an originating terminal attempts to make an incoming call to the called terminal, when the incoming signal is not normally processed according to network conditions or various states of the called terminal, the communication system sends a notification broadcast for the incoming failure to the calling terminal. It allows you to recognize incoming calls.

Accordingly, the subscriber of the calling terminal retries the incoming call to the called terminal manually when receiving the announcement broadcast due to the incoming call failure. However, this is a procedure for retrying an incoming call at the subscriber's will, which is very cumbersome for the subscriber.

In addition, when the location registration is located in a region where the location registration overlaps according to the location of the destination terminal on the communication system, the reception failure occurs very frequently. As a result, subscriber complaints about communication services are increasing.

The present invention is to provide an incoming call processing method and a mobile communication system that can increase the success rate for incoming calls to the called terminal even at the frequent location registration of the called terminal.

Accordingly, it is possible to improve communication satisfaction for subscribers, and as a result, to provide an incoming call processing method and a mobile communication system that can reduce subscriber dissatisfaction by lowering a failure rate of incoming calls.

According to an aspect of the present invention, an exchange and a mobile communication system for processing an incoming call in an area where location registration of a terminating terminal overlaps.

According to an embodiment of the present invention, a setting unit for setting an incoming retry state for the incoming call retry to the called terminal when the incoming connection failure to the called terminal-the incoming retry state is set or not set; A communication unit for receiving an incoming call request from the originating exchange to the called terminal; And a call processing unit for transmitting a resume call handling (RCH) request to the originating exchange when the incoming retry state is set when the incoming connection failure to the called terminal according to the incoming call request is set. May be provided.

According to another embodiment of the present invention, a communication unit for receiving a resume call handling (RCH) request according to the incoming connection failure from the first destination exchange to the destination terminal; An acquisition unit for acquiring location information of the called terminal through a home location register according to the call resumption request; And a call processing unit which transmits an incoming call request including a call retry number to a second called exchange using the obtained location information of the called terminal.

According to another embodiment of the present invention, a home location register for storing location information of a called terminal; A first destination exchange transmitting a resume call handling (RCH) request when an incoming connection failure to the called terminal is failed in response to the first incoming call request to the called terminal; A second called exchanger to which the called terminal is connected when a second incoming call request is made to the called terminal; And acquiring the location information of the called terminal from the home location register according to the call resumption request and using the obtained location information of the called terminal, the second incoming call request including the number of call retries. A mobile communication system can be provided that processes an incoming call, including an outgoing exchange that transmits to a second destination exchange.

By providing an incoming call processing method and a mobile communication system according to an embodiment of the present invention, the success rate for an incoming call to the called terminal can be increased even at the frequent location registration of the called terminal.

Accordingly, the present invention can increase the communication satisfaction for the subscriber, and as a result can reduce the complaints of the subscriber by reducing the incoming call failure rate.

1 is a block diagram schematically illustrating a mobile communication system for processing incoming calls.
FIG. 2 is a block diagram schematically illustrating an internal configuration of an exchange for routing an incoming call to a called terminal in the mobile communication system of FIG.
3 is a block diagram schematically illustrating an internal configuration of an exchange requesting an incoming call to a called terminal in the mobile communication system of FIG.
4 is a flowchart illustrating a method of processing an incoming call to a called terminal in the mobile communication system of FIG.

BRIEF DESCRIPTION OF THE DRAWINGS The present invention is capable of various modifications and various embodiments, and specific embodiments are illustrated in the drawings and described in detail in the detailed description. However, this is not intended to limit the present invention to specific embodiments, it should be understood to include all transformations, equivalents, and substitutes included in the spirit and scope of the present invention. In the following description of the present invention, if it is determined that the detailed description of the related known technology may obscure the gist of the present invention, the detailed description thereof will be omitted.

The terms first, second, etc. may be used to describe various components, but the components should not be limited by the terms. The terms are used only for the purpose of distinguishing one component from another.

The terminology used herein is for the purpose of describing particular example embodiments only and is not intended to be limiting of the present invention. Singular expressions include plural expressions unless the context clearly indicates otherwise. In this application, the terms "comprise" or "have" are intended to indicate that there is a feature, number, step, operation, component, part, or combination thereof described in the specification, and one or more other features. It is to be understood that the present invention does not exclude the possibility of the presence or the addition of numbers, steps, operations, components, components, or a combination thereof.

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

[Description of Fig. 1]

1 is a block diagram schematically illustrating a mobile communication system for processing incoming calls.

Referring to FIG. 1, a mobile communication system for processing an incoming call includes a communication terminal 110, a base station 120, an exchange 130, and a home location register 140.

The communication terminal 110 is an apparatus for receiving various communication services provided by a mobile communication system through a communication network. For example, the type of communication terminal 110 may be a personal computer (PC), a personal digital assistant (PDA), a cellular phone, a personal communication service (PCS) phone, a hand-held PC, or a global network (GSM). System for Mobile (Phone), WCDMA phones, CDMA-2000 phones, MBS (Mobile Broad and System) phones and the like can be included.

That is, the communication terminal 110 may be equally applicable to any device capable of receiving a mobile communication service through a communication network.

The base station 120 receives location information of the communication terminal 110, registrant information, and a communication call of the communication terminal 110. For example, the base station 120 may include a base station transmitter (BTS), a base station controller (BSC) and a repeater (not shown). have.

The base station transmitter is arranged in units of cells and performs a function of transmitting a communication call of the communication terminal 110 to the exchange 130 via the base station controller. In addition, the base station transmitter detects the position of the communication terminal 110 existing in the cell area under the control of the base station transmitter and performs location registration.

The base station transmitter receives location information of the base station transmitter from a global positioning system (GPS). The base station transmitter transmits the location information to the communication terminal 110 using a system parameter message of the forward link call channel. The communication terminal 110 may register new location information by calculating the location of the communication terminal 110 using the location information of the base station transmitter of the cell to which the communication terminal 110 belongs. Location registration is a process of informing the exchange 130 of the location, status, identifier, slot period, and other characteristics of the communication terminal 110 through the base station transmitter, where the base station transmitter establishes an incoming call to the communication terminal 110. When you want to be able to effectively call the communication terminal 110. Such location registration is performed when the power of the communication terminal 110 is turned on or off, the communication terminal 110 moves the exchange period, or the parameter of the communication terminal 110 is changed.

The base station controller performs various functions required for radio call processing such as handoff while controlling and managing a plurality of base stations. The base station controller also transmits subscriber information of the location registered terminal to the exchange.

The base station controller performs a function of transferring a communication call transmitted from the communication terminal 110 through the base station transmitter to the exchange 130.

The exchange 130 has a control function and an interworking function with a public telephone network and another network switch so that the wireless base stations can be efficiently operated. For example, when the exchange 130 receives an outgoing call, the exchange 130 checks the home location register 140 of the GT (Global Title) through translation of the incoming prefix number. The exchange 130 inquires the location information of the called terminal in the identified home location register 140 and routes it to another exchange in which the called terminal is located according to the result.

Hereinafter, the exchange where the destination terminal is located will be described collectively as the destination exchange, and the exchange where the originating terminal is located will be collectively described as the source exchange.

When the originating exchange receives a call resume request (RCH: resume call handling) from the called exchange, the originating exchange may request a location query request including the number of times the call is resumed (hereinafter referred to as call retry number). 140). Here, the number of call retries may be transmitted by being included in the numberfoForwarding parameter of the MAP SRI message transmitted by the originating exchange to the home location register for the location query of the called terminal. In addition, when the originating exchange receives the location information of the called terminal according to the location query request from the home location register 140, the calling exchange transmits an incoming call request including the number of call retries to the called exchange 130. Here, the number of call retries may be the number of times that the originating exchange re-requests the incoming call routing from the originating exchange. The number of call retries may be transmitted in the redirection counter parameter of an IAM message transmitted for an incoming call request from the originating exchange to the destination exchange. This will be described in more detail with reference to the accompanying drawings below.

The destination exchange may transmit a call resumption request (RCH) to the originating exchange if the incoming call attempt to the destination terminal fails in response to the incoming call request (IAM) of the originating exchange. At this time, the destination exchange may transmit a call resumption request to the originating exchange when the incoming call request from the originating exchange to the called terminal is less than a preset number of incoming retries. That is, when the incoming exchange fails to make an incoming call connection with the called terminal in response to the incoming call request to the called terminal through the calling exchange, the incoming exchange restarts the incoming call with the calling exchange as many preset retry attempts to increase the incoming success rate. There is an advantage to this. This will also be described in more detail with reference to the accompanying drawings below.

The home location register 140 provides routing information to the exchange 130. In addition, the home location register 140 is a database that stores a service profile about subscriber information of a user of the communication terminal 110. The home location register 140 has information on a subscriber's telephone number, a mobile identification number (MIN), an electronic serial number (ESN), and a service type of the subscriber of the communication terminal 110. That is, the home location register 140 stores all subscriber information including information of the base station 120 and the exchange 130 where the communication terminal 110 is located.

[Description of Fig. 2]

FIG. 2 is a block diagram schematically illustrating an internal configuration of an exchange which routes an incoming call to a called terminal in the mobile communication system of FIG. 1. Here, the exchange is a destination exchange connected to the destination terminal.

Referring to FIG. 2, the destination exchange includes a communication unit 210, a setting unit 215, a storage unit 220, and a call processing unit 225.

The communication unit 210 performs a function of transmitting and receiving data with other devices of the mobile communication system (for example, the originating exchange, the home location register 140, and the like).

For example, the communication unit 210 may receive an incoming call request from the originating exchange to the called terminal. Here, the incoming call request may include or may not include the number of call retries.

For example, when the originating exchange first transmits an incoming call request to the called terminal to the called exchange, the incoming call request may not include the number of call retries. On the other hand, when the originating exchange requests the incoming call routing to the called terminal in response to the call resumption request from the called exchange, the incoming call request may include the number of call retries.

The setting unit 215 sets the incoming call retry state to the called terminal. Here, the incoming call retry state may be a set state or a non-set state. The incoming call retry state may be set by the mobile communication system administrator, for example, by an operation such as relocation of a base station of the mobile communication system.

For example, if the incoming call retry state is set to the set state, the called exchange may send a call resumption request for the incoming call retry to the calling exchange when the incoming call attempt (or connection) to the called terminal fails. have.

On the other hand, when the incoming call retry state is set to the non-set state, when the incoming call attempt (or connection) to the called terminal is unsuccessful, the incoming exchange will not send a call resumption request for the incoming call retry to the calling exchange. Can be. Accordingly, according to the general method, the originating exchange may transmit a guide message according to the incoming connection failure to the originating terminal.

The call processing unit 220 performs a call processing for an incoming call attempt (or connection) to the called terminal.

For example, the call processor 220 may transmit a response message including the routing number MSRN of the destination exchange according to the routing request PRN from the home location register 140 to the home location register 140. . In addition, the call processing unit 220 is responsible for call processing for attempting (or connecting) an incoming call with the called terminal according to an incoming call request from the originating exchange to the called terminal.

That is, the call processing unit 220 when the incoming connection to the called terminal fails in response to the incoming call request (IAM) from the originating exchange to the called terminal from the originating exchange, restarting the call for resuming the incoming call according to the incoming call retry state The request (RCH) can be sent to the originating exchange. As described above, the originating exchange may transmit an incoming call request to the called terminal (IAM) including the number of call retries. Accordingly, the destination exchange extracts and updates the number of call retries included in the incoming call request (IAM) when the incoming connection failure with the destination terminal corresponds to the incoming call request (IAM) from the originating exchange. If it is less than the reference value (for example, 5), a call resume request (RCH) may be sent to the originating exchange. This will be described in more detail with reference to FIG. 4 below.

Although not shown in FIG. 2, the destination exchange may further include an algorithm for operating the destination exchange, and a storage unit for storing the number of call resumptions of the originating exchange under the control of the call processor 225.

[Description of Fig. 3]

3 is a block diagram schematically illustrating an internal configuration of an exchange requesting an incoming call to a called terminal in the mobile communication system of FIG. 1. The exchange according to FIG. 3 is an originating exchange connected to an originating terminal.

The communication unit 310 performs a function of transmitting and receiving data with other devices (for example, the home location register 140, the destination exchange, etc.) of the mobile communication system.

The acquisition unit 315 checks the home location register 140 of the GT (Global Title) through translation of the incoming prefix number according to the origination call reception under the control of the call processing unit 325. The exchange 130 obtains by checking the location information of the called terminal in the identified home location register 140.

In more detail, the acquisition unit 315 requests a routing query including the terminal information (eg, phone number, MIN, IMSI) of the called terminal to the home location register 140 according to the outgoing call reception, and the corresponding home location. The registrar 140 may receive a routing response including location information.

The storage unit 320 stores an algorithm required for operating an originating exchange, a number of call retries to a called terminal, and the like.

The call processing unit 325 updates and stores the number of call retries to the destination terminal according to the reception of the call resumption request (RCH) from the destination exchange 130 by a preset value. Subsequently, the call processing unit 325 transmits an incoming call request (IAM) including the number of call retries to the destination exchange to the acquisition unit 315.

Here, when the call resumption request (RCH) is received, the call processing unit 325 may output the number of call retries stored for the called terminal to the acquisition unit 315. Accordingly, the acquisition unit 315 may register the home location register 140 by transmitting the number of retries of the call to the home location register 140 when the location information of the called terminal is inquired. Accordingly, the number of call retries from the home location register 140 to the called terminal may be stored.

[Description of Fig. 4]

4 is a flowchart illustrating a method of processing an incoming call to a called terminal in the mobile communication system of FIG. 1. Hereinafter, an exchange connected to an originating terminal will be referred to as an originating exchange, and an exchange connected to the terminating terminal will be referred to as an incoming exchange. In addition, the destination exchange may be one or more depending on the location of the destination terminal, and in this specification, the first destination exchange and the second destination exchange will be collectively described for convenience of understanding and description. In order to obtain the location information of the called terminal from the originating terminal, the routing information request (SRI: send routing information, hereinafter referred to as SRI) or LOR: Location Request, hereinafter LOR Is called). Here, the routing information request may include origination information and incoming information. The calling information or called information is identification information of the calling terminal or called terminal, respectively, and may be, for example, a telephone number, a MIN number, an MSISDN, or the like.

In step 410, the home location register 140 inquires the location information of the destination terminal according to the reception of the routing information request, checks the first destination exchanger connected to the destination terminal, and requests a routing to the first destination exchange (PRN: Provide Roaming). Send Number or ROR: Routing Request. Here, the routing request may include incoming and outgoing information.

Accordingly, in step 415, the first destination exchange transmits a routing response message (PRN Ack or ROR ACK) to the home location register 140. Here, the routing response message may include location information of the first destination exchange.

In step 420, the home location register 140 sends a routing information response (SRI Ack or LOR ACK) including the location information of the first destination exchange according to the reception of the routing response message including the location information of the first destination exchange. Transfer to the exchange.

In step 425, the originating exchange that receives the routing information response including the location information of the first destination exchange to which the destination terminal is connected, transmits an incoming call request (IAM) to the first destination exchange using the location information. Here, the incoming call request may include incoming and outgoing information.

Accordingly, in step 430, the first destination exchange attempts an incoming call connection to the destination terminal and determines whether the incoming connection to the destination terminal has failed (step 435).

If the incoming connection to the called terminal is successful, in step 440, the first called exchange performs a call process for setting up the incoming call to the called terminal. Since the technical matters obvious to those skilled in the art, a separate description will be omitted.

However, if the incoming connection to the called terminal fails, in step 445, the first destination exchange determines whether the incoming retry state for the incoming call retry is set.

If the incoming retry state is not set, in step 450, the first destination exchange generates and transmits a guide message according to a preset incoming failure to the originating exchange.

However, if the incoming retry state is set, in step 455, the first destination exchange transmits a call retry request (RCH or Redirection Request) for an incoming call retry to the destination terminal. Here, the call retry request may include incoming and outgoing information.

The originating exchange receiving the call resumption request (RCH) in step 460 requests routing information (SRI or TTNR) including the number of call retries for the called terminal in order to obtain the location information of the called terminal according to the change of the location of the called terminal. TransferToNumberRequest) to the home location register 140. Here, the originating exchange may generate the number of call retries for the called terminal according to the initial reception of the call resumption request from the called exchange. Thereafter, the originating exchange may update and store the number of call retries for the called terminal according to a preset size corresponding to the number of times of receiving a call resumption request from the called exchange to the called terminal.

Of course, when the number of call retries exceeds a preset reference value, the originating exchange may reset or delete the number of call retries for the called terminal to a preset value (eg, 0).

In step 465, the home location register 140 receiving the routing information request including the number of call retries stores the number of call retries for the called terminal. Subsequently, the home location register 140 inquires the location information of the called terminal, checks the second called exchange connected to the called terminal, and transmits a routing request (RPN: Provide Roaming Number or ROR) to the second called exchange. Here, the routing request may include incoming and outgoing information.

Accordingly, in step 470, the second destination exchange transmits a routing response message (PRN Ack or ROR ACK) to the home location register 140. Here, the routing response message may include location information of the second destination exchange.

In step 475, the home location register 140 transmits a routing information response (SRI Ack) including the location information of the corresponding second destination exchange to the originating exchange according to the reception of the routing response message including the location information of the second destination exchange. do.

In step 480, the originating exchange that receives the routing information response including the location information of the second destination exchange to which the destination terminal is connected, transmits an incoming call request (IAM) to the second destination exchange using the location information. Here, the incoming call request (IAM) is transmitted in addition to the incoming and outgoing information further including the number of retries for the incoming call to the called terminal (that is, the number of call retries).

Accordingly, in step 485, as described in steps 430 through 450, the second destination exchange determines whether the incoming call has failed after attempting an incoming call connection to the called terminal.

If the incoming call is unsuccessful, after checking whether the incoming call retry state is set to the set state, and if it is the set state, in step 490, the second destination exchange sets a preset number of call retries for the called terminal included in the incoming call request. It is determined whether it is less than the reference value.

If less than the reference value, in step 495, the second destination exchange sends a call resumption request (RCH or RR) to the originating exchange.

However, if the number of call retries is greater than or equal to the reference value, the second destination exchange transmits a guide message for failure of the incoming call and performs the incoming call release process. That is, the second destination exchange can send an REL (release) to the originating exchange.

In FIG. 4, it has been described on the assumption that there are two destination exchangers respectively connected to the destination terminal according to the movement of the destination terminal. However, the destination exchanger may be multiple according to the location movement of the destination terminal.

Even in such a case, when the destination exchange attempts an incoming call connection according to an incoming call request (IAM) to the destination terminal and the incoming connection fails, when the incoming retry state is set inside the destination exchange, the location of the destination terminal is set. A call resumption request (RCH) may be transmitted to the originating exchange so that the incoming call request to the called terminal through the information query is resumed.

The calling exchange updates and stores the number of call retries according to the reception of the call resumption request to the called terminal, and then acquires the position of the last-connected called exchange from the home location register 140 and restarts the call with the corresponding called exchange. An incoming call request IAM including the number of times may be transmitted. Therefore, it is possible to prevent the repeated incoming call attempt due to the incoming call failure to the called terminal.

On the other hand, the method for processing an incoming call according to the failure of the incoming call to the destination terminal in the mobile communication system according to an embodiment of the present invention is implemented in the form of program instructions that can be performed through various electronic means for processing information storage medium Can be recorded. The storage medium may include program instructions, data files, data structures, etc. alone or in combination.

Program instructions to be recorded on the storage medium may be those specially designed and constructed for the present invention or may be available to those skilled in the art of software. Examples of storage media include magnetic media such as hard disks, floppy disks and magnetic tape, optical media such as CD-ROMs, DVDs, and magnetic-optical media such as floppy disks. hardware devices specifically configured to store and execute program instructions such as magneto-optical media and ROM, RAM, flash memory, and the like. In addition, the above-described medium may be a transmission medium such as an optical or metal wire, a waveguide, or the like including a carrier wave for transmitting a signal specifying a program command, a data structure, and the like. Examples of program instructions include not only machine code generated by a compiler, but also devices that process information electronically using an interpreter, for example, high-level language code that can be executed by a computer.

The hardware device described above may be configured to operate as one or more software modules to perform the operations of the present invention, and vice versa.

It will be apparent to those skilled in the art that various modifications and variations can be made in the present invention without departing from the spirit or scope of the invention as defined in the appended claims. It will be understood that the invention may be varied and varied without departing from the scope of the invention.

110: communication terminal
120: base station
130: exchanger
140: home location register

Claims (11)

A setting unit configured to set an incoming retry state for the incoming call retry to the called terminal when the incoming connection to the called terminal fails; the incoming retry state is set or not set;
A communication unit for receiving an incoming call request from the originating exchange to the called terminal; And
And a call processing unit for transmitting a resume call handling (RCH) request to the originating exchange when the incoming retry state is set when the incoming connection failure to the called terminal according to the incoming call request is set.
The method according to claim 1,
The incoming call request includes a number of call retries, and the call processing unit transmits the call resume request to the originating exchange when the number of call retries is less than a preset reference value.
The method according to claim 1,
The incoming call request includes a number of call retries, and the call processing unit transmits a call release request to the originating exchange when the number of call retries is equal to or greater than a preset reference value.
A communication unit which receives a resume call handling (RCH) request according to an incoming connection failure from the first destination exchange to the destination terminal;
An acquisition unit for acquiring location information of the called terminal through a home location register according to the call resumption request; And
And a call processing unit which transmits an incoming call request including a number of call retries to a second called exchange using the obtained location information of the called terminal.
The method of claim 4, wherein
The call processor generates the number of call retries for the called terminal according to the reception of the first call resume request from the first destination exchange, and the number of times of receiving the second call resume request from the second destination exchange. And increase the number of call retries.
The method of claim 4, wherein
And a storage for storing the number of call retries.
A home location register for storing location information of the called terminal;
A first destination exchange transmitting a resume call handling (RCH) request when an incoming connection failure to the called terminal is failed in response to the first incoming call request to the called terminal;
A second called exchanger to which the called terminal is connected when a second incoming call request is made to the called terminal; And
Acquiring the location information of the called terminal from the home location register according to the call resumption request; A mobile communication system for processing an incoming call comprising an outgoing exchange that transmits to an incoming exchange.
The method of claim 7, wherein
When the incoming call fails with the called terminal according to the reception of the second incoming call request including the call retry number, the second called exchange is less than a preset reference value. A mobile communication system that processes incoming calls that send requests to resume calls.
The method of claim 8,
The second destination exchange system transmits a call release request to the originating exchange when the number of call retries is greater than or equal to a preset reference value when the incoming connection failure with the called terminal fails.
The method of claim 8,
The originating exchange generates the number of call retries for the called terminal according to the first call resume request from the first destination exchange, and according to the number of times of receiving a second call resume request from the second destination exchange. A mobile communication system for processing an incoming call for increasing the number of call retries to store.
The method of claim 8,
The first terminating exchange and the second terminating exchange process the incoming call for transmitting the call resumption request to the originating exchange according to whether the incoming retry state is set when the incoming connection to the terminating terminal fails. .

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