KR20070089285A - Apparatus and method for processing feature code in mobile communication system - Google Patents

Abstract

An apparatus and a method for processing a feature code in a mobile communication system are provided to delay a hold-related procedure until the feature code is received, thereby providing a busy feature code service as a busy feature code, provided to a second generation network, to a third generation network. A method for processing a feature code in a mobile communication system comprises the following steps of: transmitting a holdAck message to a subscriber when a hold message is received from the subscriber(305); checking whether a setup message including the feature code is received from the subscriber after transmitting the holdAck message(311); and performing hold processing when the setup message is received(319).

Description

Apparatus and method for processing feature code in mobile communication system {APPARATUS AND METHOD FOR PROCESSING FEATURE CODE IN MOBILE COMMUNICATION SYSTEM}

1 is a diagram illustrating a signal exchange procedure for processing a feature code in a WCDMA system according to the prior art.

2 is a diagram showing a configuration for processing a feature code in a switching center (MSC) according to an embodiment of the present invention;

3 is a diagram illustrating a procedure for processing a feature code at a switching center (MSC) according to an embodiment of the present invention.

4 is a diagram illustrating a signal exchange procedure for processing a feature code in a WCDMA system according to an embodiment of the present invention.

Fig. 5 is a diagram showing a state transition diagram for performing hold processing in an exchange station according to an embodiment of the present invention.

The present invention relates to an apparatus and a method for processing a feature code in a mobile communication system, and more particularly, to perform a hold process after receiving a feature code in a wideband code division multiple access (WCDMA) communication system. An apparatus and method are provided.

As is known, UMTS (Universal Mobile Telecommunication System) is a third generation mobile communication system that combines Code Division Multiple Access (CDMA) technology based on the Global System for Mobile Communication (GSM) in Europe. Leading standardization in the 3rd Generation Partnership Project (3GPP), the system is capable of delivering high-speed data / multimedia services more efficiently than the 2nd generation system, and is expected to be widely used worldwide and can be used anywhere. ) Function can be provided. The main difference is that the GPS (Global Positioning System) is not used for synchronization compared to the cdma2000 system, which is a third generation system standard, and is also called a Wideband Code Division Multiple Access (WCDMA) system.

The WCDMA system defines a feature code, which may be referred to as an additional service request code transmitted from the terminal to the system in order to request activation / deactivation or routing processing of the additional service. For example, by sending a feature code during a call, a call forwarding request, a missed notification service request, a connection request to a specific server, etc. may be performed. This feature code is used not only in third generation WCDMA systems but also in second generation CDMA systems.

1 shows a signal exchange procedure for processing a feature code in a WCDMA system according to the prior art.

As shown, when a subscriber A transmits a feature code in a busy state, the subscriber station A (Mobile Station) 10 (MS) 10 holds a message to the radio network controller (RNC) 20 in step 101. Send a Hold message. Then, the wireless network controller 20 transmits a hold message from the terminal 10 to the media gateway controller (MGC) 30 in step 103.

Upon reception of the hold message, the media gateway controller 30 determines whether a hold service is available. If it is determined that the hold service is available, the media gateway controller 30 sends a MegaModifyReq message (MGW: Media GateWay) requesting to temporarily transmit a call route of the call in step 105. Forward to 40. In step 107, the media gateway 40 disconnects the call and delivers a response message (McModifyReplay message) to the media gateway controller 30.

After performing the call disconnection as described above, the media gateway controller 30 transmits a notifying message or holding tone to the remote subscriber (subscriber B) indicating a holding state in step 109. In operation 111, the media gateway 40 transmits the notification message or the response message (McModifyReplay message) to the holding tone transmission to the media gateway controller 30.

Then, the media gateway controller 30 transmits a HoldAck message to the wireless network controller 20 in step 113, and the wireless network controller 20 receives the received response in step 115. The message is transmitted to the terminal 10.

Upon receiving the HoldAck message, the terminal 10 transmits a CmSvcReq message to the radio network controller 20 in step 117 and receives a CmSvcAcpt message in response to step 119. In step 121, the terminal 10 transmits a setup message including the feature code to the radio network controller 20. Then, the wireless network controller 20 transmits a setup message from the terminal 10 to the media gateway controller 30 in step 123.

In step 125, the media gateway controller 30 receiving the setup message transmits the received feature code to the intelligent network SCP (Service Control Point) 50. Thereafter, the SCP 50 may request the media gateway controller 30 to perform additional operations based on the received feature code.

In the above description, the media gateway controller 30 and the media gateway 40 are entities that constitute a mobile switching center (MSC). The media gateway 40 is actually responsible for call switching, and the media gateway controller 30 controls call switching of the media gateway 40.

As described above, when the WCDMA system sends a feature code to request a specific service during a call, the WCDMA system first receives a hold message from the terminal, disconnects the call, and holds a tone ( The hold process is completed, for example, by transmitting a holding tone. Thereafter, the system transmits a holdAck message to the terminal and receives a setup message with the feature code as the called party from the terminal to process the feature code. On the other hand, in the second generation CDMA system (eg, GSM system), when a subscriber transmits a feature code during a call, the feature code is immediately transmitted to the system without additional operation, thereby enabling service without disconnection to the call.

As described above, since the WCDMA system first receives the feature code through the setup message after completing the hold processing, the WCDMA system cannot support a service that does not require a hold operation. This also means that the subscriber could not consistently provide the services provided in the 2nd generation CDMA network environment in the 3rd generation CDMA network.

Accordingly, an object of the present invention is to provide an apparatus and method for consistently supporting a feature code service supported in a second generation CDMA network in a third generation CDMA network.

Another object of the present invention is to provide an apparatus and method for performing hold processing after receiving a feature code in a WCDMA system.

According to an aspect of the present invention for achieving the above object, in a method of processing a feature code of the switching center in a mobile communication system, the process of transmitting a hold response message to the subscriber upon receiving a hold message from the subscriber, And after the hold response message is transmitted, checking whether a setup message including a feature code is received from the subscriber, and performing a hold process upon receiving the setup message.

According to another aspect of the present invention, a feature code processing apparatus of a switching center in a mobile communication system includes a timer in which a reception waiting time of a setup message including a feature code is set, and a hold response message when a hold message is received from a subscriber. And a call processing unit waiting for reception of the setup message until the timer expires.

According to still another aspect of the present invention, in a method for processing a feature code in a mobile communication system, when a subscriber transmits a feature code, the terminal transmits the hold message to the switching station, and when the holding message is received, Waiting for reception of a setup message for a predetermined time after transmitting a hold response message to the terminal; and upon receiving the hold response message, the terminal transmits a setup message including a feature code to the switching center; And when the setup message is received within the predetermined time, the switching center performs a hold process.

Hereinafter, the operating principle of the present invention will be described in detail with reference to the accompanying drawings. In the following description of the present invention, if it is determined that a detailed description of a related known function or configuration may unnecessarily obscure the subject matter of the present invention, the detailed description thereof will be omitted. Terms to be described later are terms defined in consideration of functions in the present invention, and may be changed according to intentions or customs of users or operators. Therefore, the definition should be made based on the contents throughout the specification.

Hereinafter, a method for performing hold processing after receiving a feature code in a mobile communication system will be described. Although the following description takes a wideband code division multiple access (WCDMA) communication system as an example, the present invention may be applied to other communication systems such as a synchronous mobile communication system (eg, CDMA2000).

Fig. 2 shows a configuration for processing a feature code in a switching center (MSC) according to an embodiment of the present invention.

As shown, the switching center includes a call processing unit 200, a message analyzer 202, a message generator 204, a feature code database (DB) 206, and a timer 208.

Referring to FIG. 2, first, the message analyzer 202 analyzes a message received from a radio network controller (RNC) and delivers the message to the call processor 200. According to the present invention, the message analyzer 202 analyzes a setup message including a hold message and a feature code received from the radio network controller (RNC) to the call processor 200. to provide.

Feature code database 206 manages feature codes for additional services provided by the system. For example, the feature code database 206 manages whether or not the additional service for each feature code requires hold processing.

The call processing unit 200 performs a corresponding call processing according to a message analysis result from the message analyzer 200. According to the present invention, upon receiving a hold message, the call processing unit 200 controls the message generator 204 to transmit a response message, and drives a timer 208 having a preset time set. Herein, the timer 208 is a timer in which a time for waiting to receive a setup message including a feature code is set.

When the setup message is received from the wireless network controller while the timer 208 is running, the call processing unit 200 searches for a feature code in the setup message and searches the database 206 for a hold code. If the feature code requires the hold process, the feature code is transmitted to the intelligent network SCP (Service Control Point) after performing the hold process.

The message generator 204 generates a corresponding message under the control of the call processor 200 and transmits the message to the radio network controller. According to the present invention, the message generator 204 generates a HoldAck message and transmits it to the radio network controller.

3 shows a procedure for processing a feature code in an MSC according to an embodiment of the present invention.

Referring to FIG. 3, first, in step 301, the switching center checks whether a hold message is received from the radio network controller. When the hold message is received, the exchange proceeds to step 303 to determine whether there is a possibility of receiving a setup message including a feature code thereafter. The likelihood determination may be determined in consideration of the information included in the hold message, the current subscriber state, and the like.

If it is determined that the feature code is unlikely to be received, the exchange proceeds to step 323 to perform a general hold process. On the other hand, if it is determined that the feature code is likely to be received, the exchange proceeds to step 305 and transmits a HoldAck message for the hold message to the radio network controller (terminal). After transmitting the response message, the switching center starts a timer in which the reception waiting time of the setup message including the feature code is set in step 307. After running the timer, the switching center checks in step 309 whether the timer has expired.

If the expiration of the timer is detected, in other words, if the setup message is not received until the timer expires, the exchange immediately proceeds to step 319 to perform a hold process. If the expiration of the timer is not detected, the exchange proceeds to step 311 and checks whether a setup message including a feature code is received. If the reception of the setup message is not detected, the exchange returns to step 309 again to detect expiration of the timer.

On the other hand, when the setup message including the feature code is received, the exchange goes to step 313 to stop the operation of the running timer. In step 315, the switching center searches the feature code database with the feature code included in the setup message. In operation 317, the exchange determines whether the supplementary service according to the feature code requires the hold process.

If the hold process is not required, the exchange proceeds to step 321 to transmit the feature code to the corresponding intelligent network SCP (Service Control Point). If the feature code requires hold processing, the switch center proceeds to step 319 to control the call switch (media gateway) to perform the hold processing and then proceeds to step 321. As described above, the hold processing means processing such as cutting into a call and sending a holding tone to a remote subscriber.

4 illustrates a signal exchange procedure for processing a feature code in a WCDMA system according to an embodiment of the present invention.

As shown, when the subscriber A transmits a feature code in a busy state, the subscriber station A (Mobile Station) 10 (MS) 10 holds a message to the radio network controller (RNC) 20 in step 401. Send a Hold message. Then, the wireless network controller 20 transmits a hold message from the terminal 10 to the media gateway controller (MGC) 30 in step 503.

Upon reception of the hold message, the media gateway controller 30 determines whether a hold service is possible. If it is determined that the hold service is available, the media gateway controller 30 transmits a HoldAck message to the wireless network controller 20 in response to the hold message. After transmitting the response message, the media gateway controller 30 drives the timer in which the reception waiting time of the setup message including the feature code is set in step 407.

On the other hand, the wireless network controller 20 transmits the HoldAck message to the terminal 10 in step 409. In step 411, the terminal 10 receiving the response message transmits a CmSvcReq message to the radio network controller 20, and receives a CmSvcAcpt message in response to the response. In step 415, the terminal 10 transmits a setup message including the feature code to the radio network controller 20. In step 417, the wireless network controller 20 transmits a setup message from the terminal 10 to the media gateway controller 30.

The media gateway controller 30 that receives the setup message while the timer is running stops the operation of the timer in operation 419. In operation 421, the media gateway controller 30 transmits a megaco message (McModifyReq message) requesting to temporarily transmit the call path of the busy call to a media gateway (MGW) 40. In step 423, the media gateway 40 disconnects the call and delivers a response message (McModifyReplay message) to the media gateway controller 30.

After performing the disconnection in this manner, the media gateway controller 30 transmits a notification message or holding tone to the remote subscriber (subscriber B) indicating the hold state in step 425. In operation 427, the media gateway 40 transmits the response message (McModifyReplay message) to the media gateway controller 30.

In step 429, the media gateway controller 30 transmits the feature code to the intelligent network SCP (service control point) 50 for the intelligent network service. Thereafter, the SCP 50 may request the media gateway controller 30 to perform additional operations based on the received feature code.

When the hold process is processed after receiving the feature code as described above, the state transition diagram (FSM: Finite State Machine) for the hold process is changed.

Fig. 5 shows a state transition diagram for performing hold processing in an exchange station according to an embodiment of the present invention.

As shown in the figure, the following six states are defined to perform the hold process.

The idle state (CH_Idle) 500 represents an initial state related to call hold. The hold delay state (CH_DelayedHold) 502 is a state waiting for an additional hold related instruction after receiving a hold process from a subscriber and transmitting a response result (Returnresult) for HoldAck or HoldMpty (Hold-Multi Party Call) to the terminal. The holding processing state (CH_ProcessingHold) 504 indicates a state of performing a holding procedure. The abnormal hold state (CH_PretendingHold) 506 is in a state of maintaining a hold state with a terminal and maintaining an idle inside the switching center in response to an abnormal hold processing request. The completion state (CH_Held) 508 indicates the state of completing the hold procedure. The recovery process state (CH_ProcessRetrieve) 510 indicates a state in which a hold recovery procedure is performed by receiving a recovery process from a subscriber.

Referring to FIG. 5, first, when a Hold message is received from a subscriber station in the idle state 500, the switching center transmits a response result for HolAck or HoldMPTY to the terminal, and then transitions to the hold delay state 502. The predetermined timer is driven. Here, the timer is a timer in which a reception waiting time of a setup message including a feature code is set.

 When the timer expires in the hold delay state 502 or when a setup message including the feature code is received, the switching station transitions to the hold processing state 504 to perform a hold process. Here, the hold processing means processing such as cutting a call and sending a holding tone to a remote subscriber. When the hold processing is completed in the hold processing state 504, the switching center transitions to the complete state 508. When the retrieval request is received from the subscriber in the completion state 508, the switching center transitions to the retrieval processing state 510 to perform retrieval processing. When the recovery processing is completed in the recovery processing state 510, the exchange station transitions to the idle state 500 after transmitting a response to the recovery processing.

 On the other hand, when a message requesting an abnormal hold process is received in the hold delay state 502, the switching center transitions to an abnormal hold state 506. If the abnormal hold process is not resolved in the abnormal hold state 506, the exchange transfers to the idle state 500 after transmitting a recovery process related response message to the subscriber.

Meanwhile, in the detailed description of the present invention, specific embodiments have been described, but various modifications are possible without departing from the scope of the present invention. Therefore, the scope of the present invention should not be limited to the described embodiments, but should be determined not only by the scope of the following claims, but also by those equivalent to the scope of the claims.

As described above, the present invention delays the hold related procedure until the feature code is received, thereby providing the feature code service during a call in the third generation network in the same manner as the busy feature code service method provided in the second generation network. There is an advantage to that. That is, there is an advantage that the subscriber can receive the same service using the same MMI (Man-Machine Interface) without any inconvenience even when handover between the second and third generation networks.

Claims (14)

A method of processing a feature code of an exchange station in a mobile communication system, When the hold message is received from the subscriber, transmitting a hold response message to the subscriber; Checking whether a setup message including a feature code is received from the subscriber after transmitting the hold response message; And performing a hold process upon receiving the setup message. The method of claim 1, wherein the setup message receiving process comprises: After the hold response message is transmitted, driving a timer having a reception waiting time of a setup message; And checking whether a setup message including a feature code is received from the subscriber while the timer is running. The method of claim 2, And if the setup message is not received until the timer expires, performing the hold process. The process of claim 1, wherein the performing of the hold process comprises: When the setup message is received, extracting feature codes from the setup message; Determining whether an additional service according to the feature code requires a hold process; And if the hold process is requested, performing the hold process. The process of claim 1, wherein the performing of the hold process comprises: Cutting the call path of the subscriber; After the call is disconnected, transmitting a message or holding tone indicating a holding state to a counterpart subscriber of the subscriber. The method of claim 1, And after performing the hold processing, transmitting the feature code in the setup message to an intelligent network SCP. A feature code processing apparatus of an exchange station in a mobile communication system, A timer for setting a reception waiting time of a setup message including a feature code; And a call processing unit for transmitting a hold response message upon receiving a hold message from a subscriber and waiting for reception of the setup message until the timer expires. The method of claim 7, wherein Further comprising a database for managing feature codes for additional services provided by the system, And the call processing unit searches the database with the feature code in the received setup message to determine whether a hold process is required, and performs the hold process when the hold process is required. The method of claim 7, wherein And if the setup message is not received until the timer expires, the call processing unit performs the hold processing. The method of claim 7, wherein The call processing unit, characterized in that for transmitting the feature code in the setup message to the intelligent network SCP (Service Control Point) after performing the hold processing. A feature code processing method in a mobile communication system, Transmitting, by the terminal, the hold message to the switching center when the subscriber transmits the feature code; Upon receiving the hold message, the switching station waiting for reception of a setup message for a predetermined time after transmitting a hold response message to the terminal; Transmitting, by the terminal, a setup message including a feature code to the switching center when the hold response message is received; And when the setup message is received within the predetermined time, the switching center performs a hold process. The method of claim 11, wherein the holding process is performed. Cutting the call path of the subscriber; After the call is disconnected, transmitting a message or holding tone indicating a holding state to a counterpart subscriber of the subscriber. The method of claim 11, And if the setup message is not received during the predetermined time, the switching center further performs the hold process. The method of claim 11, And, after performing the hold processing, transmitting, by the switching center, the feature code in the setup message to an intelligent network service control point (SCP).

Images