KR100641326B1 - Call management method in 3GPP generation mobile communication network - Google Patents

Abstract

The present invention provides a method for processing a call according to a communication standard in a core network of a next-generation mobile communication network, and transmits an IAM (Initial Address Message) from a calling party to a called party according to a call processing request from a calling party, and at the same time, a basic codec at the calling party. Pre-set outgoing RAB (Radio Access Bearer) using the information, and when the outgoing RAB setup is completed, the calling party provides a replacement tone of the ring back tone from the calling party to the calling terminal, and during the process, the called party attempts paging according to the IAM. When a paging response is received, codec negotiation is performed, and an incoming RAB is set using specific codec information determined as a result of the negotiation, and at the same time, an APM message including specific codec information is provided to the calling party to relay between the receiving party and the calling party. Allow section currency to connect. Then, when the called terminal is alerted, the called party provides the ACM and the RBT to the calling party so that the RBT is provided to the calling terminal and cuts off the replacement sound of the RBT or the calling terminal and the calling party. Before the two-way call path is established between terminals, the calling party compares the basic codec information with the specific codec information and resets the calling RAB by using the specific codec information.

Next generation mobile network, WCDMA, call processing, call mute, coloring

Description

Call processing method in next generation mobile communication network {Call management method in 3GPP generation mobile communication network}

1 is a data flow diagram illustrating a basic call processing method in a general next generation mobile communication network.

2 is a data flow diagram illustrating a call processing method of a next-generation mobile communication network according to an embodiment of the present invention for eliminating an outgoing mute state.

The present invention relates to a ring back tone service in a next generation (3GPP: 3 Generation Partnership Project, R4 (Release4)) mobile communication network. In particular, the calling subscriber makes a call during call processing in a next generation mobile communication network. The present invention relates to a call processing method in a next-generation mobile communication network that enables to provide an RBT or a coloring service without a silent state from an incoming paging request.

In general, the characteristics of the mobile call processing in the mobile communication technology require the setting of a radio channel between the called base station and the called terminal by the incoming paging before the alerting time of the called terminal. In this way, when the receiving terminal is alerted after the wireless channel is set up at the called party and the called party RAB is set accordingly, the calling terminal is provided with a RBT.

However, in general, the response time of the called terminal to the incoming paging, that is, the time that the wireless channel is set up takes a few seconds up to several tens of seconds, so that the calling terminal has an outgoing mute state for several seconds to several tens of seconds when the wireless channel is established. do.

This outgoing mute state has caused dissatisfaction with the service to users who are familiar with the use of wired terminals. For this reason, the second generation mobile communication network provides a proceeding tone, which is an alternative to the RBT, to the calling terminal at the time of paging attempt, so that the ring back tone is connected from the paging point. We cancel outgoing mute state until.

However, the next-generation mobile communication network of the 3GPP R4 standard cannot use the method of providing a progress sound to the calling terminal at the time of paging attempt, and also cannot solve the outgoing mute state because it cannot develop a method of replacing the same.

Hereinafter, the next generation mobile communication network of the 3GPP R4 standard will be briefly described.

The 3GPP R4 standard, which is advanced from the 3GPP Release 99 standard, is a switching server (hereinafter referred to as 'MSC') solely for signaling switching (MSC: Mobile Switching Center) and media gateway (MGW :) for media transmission and conversion. Media GateWay) completely separate the path for signal processing and data bearer processing. As a result of these changes, TFO (Tandem Free Operation) and TrFO (Transcoder Free Operation) are defined to improve call quality and efficiently use resources by avoiding unnecessary codecs on bearer processing paths between media gateways. MEGACO (MEGA GAteWay COntrol) was defined between the media gateway and the exchange for call control, and the bearer-independent call control (BICC) protocol was introduced for relay call processing between the exchanges.

The next generation mobile communication network of the 3GPP R4 standard (hereinafter referred to as 'third generation mobile communication network') performs a typical call processing procedure as shown in FIG. 1 is a call processing procedure diagram of a general next-generation mobile communication network.

As shown in FIG. 1, a third generation mobile communication network includes a radio access network (RAN) including a base station performing call processing and a base station controller (RNC) for controlling a base station, and signaling. Core network (CN), which includes an exchange center (MSC) for processing a network, a media gateway (MGW) for processing media transmission and conversion, and a home location register (HLR). By the MSC and the originating and terminating radio network controller (RNC). Here, the Iu interface is used between the MSC and the media gateway and the base station controller (RNC).

First, when the calling terminal inputs the mobile telephone number of the called terminal and requests the call to the calling radio access network (O_RAN), the calling radio access network (O_RAN) requests the call to the calling exchange (O_MSC) (101). In response to the call originating request, the O_MSC transmits an IAM (Initial Address Message) including the called party identification information and the supportable codec information supported by the called party to the destination exchange T_MSC (102). Upon receipt of the IAM, the T_MSC transmits paging to the terminating radio access network T_RAN (103).

The terminating exchange T_MSC then receives a paging response from the terminating radio access network T_RAN (104), sends an incoming setup message to the terminating terminal (105), and includes supportable called party codec information. Receive a Call Confirm message (106).

The destination exchange (T_MSC) performs codec negotiation with the collected source and destination codec information to determine specific codec information and transmits an APM (Application Transport Mechanism) message including the determined codec information to the source exchange (O_MSC). At the same time, the terminating radio access network (O_RAN) causes the terminating RAB to be set with the set codec information (108).

The originating exchange (O_MSC) performs outgoing radio access network (O_RAN) and RAB setup with the codec information included in the APM message (110). Information for connecting to a codec and other intercommunication paths is transferred to connect the intercommunication paths through the media gateways O_MGW and T_MGW (109).

The RBT of the called media gateway T_MGW corresponding to the alerting of the called terminal is transmitted to the calling media gateway O_MGW through the connected relay section call paths (111 and 112). At the same time, RBT is provided and the destination exchange (T_MSC) sends an address complete message (ACM) indicating the incoming alert state to the originating exchange (O_MSC) (113), and the originating exchange (O_MSC) is the originating terminal side. In step 114, a message indicating an alerting state is transmitted.

Then, when the called party answers the incoming call to the called terminal, the called radio access network (T_RAN) transmits a connection message to the called exchange (T_MSC) (115), whereby the called exchange (T_MSC) sends an Answer Message (ANM) to the calling exchange ( O_MSC) and the originating exchange (O_MSC) transmits a connection message to the originating radio access network (O_RAN) to notify that the transition to the busy state by the incoming response (117). In addition, during this process, the mobile station establishes a bidirectional call through the MEGACO message to the media gateway (118).

As described above, the third generation mobile communication network has been described. However, if the silent solution applied to the second generation mobile communication network is applied to the third generation mobile communication network, the following problems occur.

That is, in order to apply the mute cancellation method applied to the second generation mobile communication network to the third generation mobile communication network, an alternate sound of the RBT should be provided from the paging transmission time 103 to the calling terminal. Calls from the media gateway to the outgoing radio network must be established first.

However, as described above, the originating RAB in the next generation mobile communication network is a procedure performed after the paging response. Therefore, in the next generation mobile communication network, since RAB is not set up between the originating radio access network (O_RAN) and the originating terminal at the time of paging transmission, the call cannot be connected to the call transmitting the replacement tone of the RBT to the originating terminal. There is no problem.

Accordingly, an object of the present invention is to solve the conventional problem, and to solve the outgoing mute until the incoming terminal is alerted after the call origination in the 3G mobile communication network.

In order to achieve the above object, the present invention provides a method for processing a call according to a communication standard in a core network of a next-generation mobile communication network, comprising: transmitting an IAM (Initial Address Message) from a calling party to a called party according to a call processing request of a calling party; Stage 1; A second step of setting up an outgoing radio access network and an outgoing radio access bearer (RAB) using basic codec information at the calling party; A third step of providing a substitute sound of a ring back tone from the calling party to the calling terminal when the calling RAB setting is completed; A fourth step of attempting paging at the called party according to the IAM; A fifth step of, if the paging response is received, perform a codec negotiation at the called party and establish a called radio access network and a called RAB using specific codec information determined as a result of the negotiation; A sixth step of providing, by the called party, an APM (Application Transport Mechanism) message including the specific codec information to the calling party so that a relay section call path is connected between the receiving party and the calling party; A seventh step of, when the called terminal is alerted, providing a call completion tone to an originating terminal by providing an address complete message (ACM) and a ring back tone at the called side; And resetting the originating RAB by using the specific codec information when the calling party compares the basic codec information with the specific codec information before the bidirectional call path is established between the called terminal and the calling terminal. It provides a call processing method in a next-generation mobile communication network comprising the eight steps.

The present invention also provides a computer-readable recording medium for executing the above-described method to achieve the above object.

Hereinafter, a preferred embodiment according to the present invention will be described with reference to FIG. 2.

2 is a data flow diagram illustrating a call processing method of a next generation mobile communication network according to an exemplary embodiment of the present invention for resolving an outgoing mute state.

First of all, the method of the present invention is implemented in a mobile communication network conforming to the 3GPP R4 standard. Since call processing is performed at originating and terminating radio access networks (O_RAN, T_RAN), originating and terminating exchanges (O_MSC, T_MSC), and originating and terminating media gateways (O_MGW, T_MGW), The present invention will be described below.

First, the caller enters the mobile terminal number of the called terminal into the calling terminal and presses the transmit key to send the call to the calling radio access network (O_RAN), and the calling radio access network (O_RAN) requests the call originating from the calling exchange (O_MSC). (201). The originating exchange (O_MSC) receives and stores the supportable codec information of the originating terminal at this time.

When the originating exchange (O_MSC) receives a call request from the originating radio access network (O_RAN), the call exchanger (O_MSC) identifies the destination exchange (T_MSC) from the home location register through the telephone number of the called terminal included in the received call and sends it to the called exchange (O_MSC). The IAM signal is transmitted (202). At this time, the IAM signal includes supportable source codec information.

The originating exchange (O_MSC) transmits an IAM and specifies default codec information to temporarily set an originating RAB in the originating radio access network (O_RAN) (203).

When the RAB setup is completed, the originating exchange (O_MSC) instructs the originating terminal to provide a calling tone (Proceeding Tone) of the RBT to the originating terminal through a MEGACO message to eliminate the silence of the calling party. (204). In this case, when a call abnormal call termination message is transmitted from the T_MSC due to a problem occurring before a paging attempt, an announcement or a tone may be transmitted without a replacement sound of the ring back tone.

While the calling party RAB is set and the replacement tone is provided as described above, the called party calls the called terminal according to the IAM signal transmitted from the calling exchange O_MSC, and the calling RAB is set. That is, when the receiving exchanger (T_MSC) receives the IAM signal, it stores the supportable codec information transmitted from the calling party, transmits paging to the terminating radio access network (T_RAN), and calls the terminating terminal through the terminating radio access network (T_RAN). (205).

If the called terminal is in a callable state, the called radio access network T_RAN transmits a paging response to the called exchange T_MSC (206). The terminating exchange (T_MSC) transmits a setup message to the terminating terminal upon receiving the paging response (207), and receives a call confirm message including codec information supported by the terminating party from the terminating terminal ( 208), the destination exchange T_MSC determines the specific codec information by performing codec negotiation by using the stored source codec information and the called party support codec information.

When the codec information is determined, the T_MSC transmits an APM (Application Transport Mechanism) message including the determined codec information to the originating exchange (O_MSC) (209), and simultaneously sets up the incoming RAB to the terminating radio access network (T_RAN). Perform 210.

When the originating exchange (O_MSC) receives the APM message from the terminating exchange (O_MSC), the originating exchanger (O_MSC) stores the final determined codec information, that is, specific codec information included in the APM message (211), and relays it through the MEGACO message to the originating media gateway (O_MGW). Instructing the call path, and thus, the originating and terminating media gateway connects the relay section call path with each other (212).

On the other hand, the occurrence of the alerting of the called terminal by the setting of the called RAB is known to the called exchange T_MSC (213), and the called exchange T_MSC transmits the ACM to the calling exchange O_MSC (215). At the same time, the destination exchange T_MSC connects the RBT to the destination media gateway T_MGW through a MEGACO message. The ring back tone provided by the terminating media gateway is transmitted to the outgoing media gateway O_MGW through the relay section call path (214).

When the originating exchange (O_MSC) receives the ACM message from the terminating exchange (T_MSC), it transmits the MEGACO message to the originating media gateway, and stops the transmission of the currently provided provisioning tone (216). The RBT is provided from the called party to the calling terminal. When the RBT is provided through the calling RAB, the caller hears the RBT through the calling terminal. At this time, the originating exchange (O_MSC) provides an alerting message to the calling terminal informing the state transition (altering of the called terminal) of the called terminal (217).

After the process is completed, when the called party accepts the call connection by operating the called terminal, the called terminal transmits a message (Connect) indicating the call state to the called exchange (T_MSC) (218), and the called exchange (T_MSC) calls An ANM (Answer Message) informing the connection is transmitted to the calling exchange (O_MSC) (219), and the setting is performed as a two-way call cutting the ring back tone through the incoming media gateway.

The originating exchange (O_MSC) compares the specific codec information, which is the final codec negotiation result transmitted from APM and stored with the preset codec information, after the ANM message is received and before the sender and receiver perform the busy state setting operation in which the two-way call is opened. If the specific codec information and the basic codec information is the same as the comparison result, the current set originating RAB is kept as it is (221). RAB setting is made (222). Then, a message (Connect) informing of a busy state is transmitted to the calling terminal (223), and a two-way call path is established through the calling media gateway (224).

As a result, the present invention resolves outgoing silence by providing a substitute tone immediately to the caller when the caller transmits the call and providing such a substitute tone until the actual RBT is provided.

On the other hand, in the above-described embodiment, it has been described that after the RBT is provided to the caller, a process 220 for comparing the basic codec information temporarily set by the calling party with specific codec information that is the final result transmitted from the called party is described. . However, the process of determining whether to reset the RAB, which compares the basic codec information used when setting the temporary RAB and the specific codec information as the final negotiation result, is performed until a two-way call path is established between the sender and the receiver based on the 3GPP R4 standard. Is enough. Therefore, the process 220 can be performed at any point in time after the APM is received by the originating exchange (O_MSC) and the final coded information is finally negotiated and before the bidirectional call path is established between the sender and the receiver.

Although the above-described embodiment has described a case in which there is a paging response to paging of the destination exchange T_MSC, when the paging of the destination exchange T_MSC is not a normal paging response, that is, the called terminal is busy or powered off. There may be a case where off and a called terminal is in a shadowed area. This case is briefly explained.

As described above, the RAB is set at the calling party regardless of the paging attempt procedure of the called party. The incoming paging attempt first determines a state in which a paging attempt is not made, such as a case of a call or a power off, by determining the state of the called subscriber in the destination exchange T_MSC. In this case, the destination exchange T_MSC transmits a call release message including the reason to the originating exchange O_MSC. The originating exchange (O_MSC) may send out an announcement or tone according to the reason, and eventually terminate the call. For this case, the originating exchange O_MSC may wait a predetermined time for connecting the replacement tone of the ring back tone. If the called terminal is in the shadowed area, it is an incomplete call that occurs after the paging attempt. Therefore, the calling terminal is listening for a replacement ring tone. The called exchange (T_MSC) forwards the message including the reason to the calling party due to the non-answering paging. The originating exchange (O_MSC) terminates the call after connecting the appropriate announcement or tone through the originating media gateway.

On the other hand, the present invention, like the second generation mobile communication solves the call mute until the call is provided after the caller requests the call. Therefore, the present invention is capable of coloring service like second generation mobile communication. That is, the present invention is to provide a progress tone provided by the originating media gateway (O_MGW) at the above-described progress tone connection time 204, but the caller subscribes to a coloring service and registers a coloring call ring tone such as a pop song or the like. It is possible to provide a coloring service that provides CRBT: Coloring RBT in place of the progress sound. In the case of providing the coloring service, the present invention omits the process of blocking the progress sound by the calling media gateway (O_MGW), and instead, a coloring call connection sound in the process of setting up a two-way call path between the calling and destination terminals. You can block it.

The technical spirit of the present invention has been described above with reference to the accompanying drawings, but this is by way of example only and not intended to limit the present invention. In addition, it is obvious that any person skilled in the art can make various modifications and imitations without departing from the scope of the technical idea of the present invention.

The present invention has the effect of improving the quality of service and trusting the user by eliminating the outgoing silence state while complying with the 3GPP R4 standard. In addition, since the present invention conforms to the 3GPP R4 standard, it is easy to add additional services, and the coloring service can be performed like the second generation mobile communication.

Claims (5)

In the method of processing a call according to the communication standard in the core network of the next generation mobile communication network, A first step of requesting a call origination by the originating exchange in response to the call processing request of the originating terminal by the originating terminal; The originating exchange transmits an IAM (Initial Address Message) including the originating codec information that can be supported by the destination exchange according to the call origination request according to the first step, and designates basic codec information to send the originating RAB to the originating radio access network. A second step of temporarily setting a radio access bearer; When the originating RAB setup is completed by the second step, the originating exchange instructs the originating media gateway to provide a replacement tone of the ring back tone to the calling terminal so that a substitute sound of the ring back tone is provided to the calling terminal. step; The destination exchange receiving the IAM in the second step transmits paging to the destination radio access network to call the destination terminal through the destination radio access network; If the destination exchange receives a paging response after the fourth step, the destination exchange performs codec negotiation and transmits an APM (Application Transport Mechanism) message including specific codec information determined as a result of the negotiation, to the originating exchange, A fifth step of performing an incoming RAB setting operation on the incoming wireless access network; The sixth step of receiving the APM message from the destination exchange by the fifth step, instructing the outgoing media gateway to connect to the relay call by instructing the outgoing media gateway to connect to the relay section; ; When the terminating terminal is alerted by the terminating RAB setting according to the fifth step, the terminating exchange transmits an address complete message (ACM) to the originating exchange, and the originating exchange that receives the ACM from the terminating exchange exchanges the originating media. A seventh step of instructing the gateway to stop transmitting the substitute tone of the currently provided ring back tone, wherein the terminating exchange instructs the called media gateway to provide the ring back tone to the calling terminal; And Before the bidirectional call path is established between the called terminal and the calling terminal, the calling exchange compares the basic codec information with the specific codec information and resets the calling RAB by using the specific codec information when it is different. Call processing method in the next generation mobile communication network comprising the step of. The method of claim 1, The call connection tone provided in the seventh step is a call processing method in a next generation mobile communication network, wherein the called party is a coloring call connection tone registered and registered with a coloring service. The method of claim 1, After the fourth step, If the destination exchange does not receive a paging response, the destination exchange notifies the originating exchange of the reason for the paging failure, and accordingly, the originating exchange stops the replacement of the ring back tone and informs the originating terminal of the reason for the paging failure. Call processing method in the next generation mobile communication network comprising a. delete delete

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