KR20060024996A - Method for transmitting and receiving call without transcoding between wcdma system and cdma system and apparatus thereof - Google Patents

Abstract

The present invention relates to a method and apparatus for transmitting and receiving a call without transcoding between a WCDMA network and a CDMA network, and a method for establishing a call transmitted and received between a calling terminal and a called terminal respectively located in a WCDMA network and a CDMA network according to the present invention. Receiving call setup request information and voice codec information from the originating terminal at the originating exchange; detecting terminating exchange information in which the called terminal is registered in correspondence with the call setup request information at the originating exchange; Transmitting the call setup request information and the voice codec information to the detected exchange, and the terminating exchange transmits the received call setup request information and the voice codec information to the called terminal. Voice codec information determined by the called terminal among the information and the Receiving and transmitting call establishment response information corresponding to call establishment request information to the originating terminal, wherein the destination exchange and the originating exchange correspond to each transcoder in accordance with the call establishment response signal and the determined voice codec information. The method may include setting a call path between the calling terminal and the called terminal which bypass.

WCDMA, CDMA, DBDM, Voice Codec.

Description

Method for transmitting and receiving call without transcoding between WCDMA system and CDMA system and apparatus             

1 is a flowchart illustrating a method for establishing a call transmitted and received between a calling terminal and a called terminal located in a WCDMA network and a CDMA network according to the prior art.

2 is a schematic structural diagram of an overall system used in a WCDMA network and a CDMA network according to a preferred embodiment of the present invention.

3A is a format diagram of a call setup request signal between a WCDMA network and a CDMA network according to a preferred embodiment of the present invention.

3B is a format diagram of a call setup response signal between a WCDMA network and a CDMA network according to a preferred embodiment of the present invention.

3b is a format diagram of a handover request signal between a WCDMA network and a CDMA network according to a preferred embodiment of the present invention;

4 is a flowchart illustrating a method for setting up a call transmitted / received without transcoding between a calling terminal and a called terminal located in a WCDMA network and a CDMA network, respectively, according to a preferred embodiment of the present invention.

5 is a flowchart illustrating a method for performing a handover between a WCDMA network and a CDMA network without transcoding by a busy mobile communication terminal according to an exemplary embodiment of the present invention.

Figure 6 is a schematic diagram of the overall system used between the WCDMA network, the CDMA network and the public telephone network according to a preferred embodiment of the present invention.

Figure 7a is a comparison of the call setup method between the WCDMA network and the CDMA network according to a preferred embodiment of the present invention compared to the call setup method according to the prior art.

FIG. 7B is a comparison diagram illustrating a method for handover between a WCDMA network and a CDMA network according to a preferred embodiment of the present invention, compared with a method for handover according to the related art. FIG.

<Explanation of symbols for the main parts of the drawings>

10: WCDMA Mobile Switching Center (MSC)

20 WCDMA base station controller (RNC: Radio Network Controller)

30: WCDMA base station (Node-B)

40: Home Location Register (HLR)

50: CDMA mobile network exchange (MSC)

60: CDMA base station controller (BSC)

70: CDMA base station (BTS: Basestation Tranceiver System)

80: terminal located on the WCDMA network

90: terminal located in the CDMA network

The present invention relates to a method for transmitting and receiving a call between a WCDMA network and a CDMA network, and more particularly, to a method for transmitting and receiving a call without transcoding between a WCDMA network and a CDMA network.

Currently, mobile communication networks use a method of transmitting and receiving voice data in the form of a compressed frame by coding voice data for efficiency of radio resources. When the calling mobile communication terminal and the called mobile communication terminal are located in the same mobile communication network, a method of transmitting and receiving a call between mobile communication terminals is a method of transmitting and receiving a call without transcoding compressed coded voice data. On the other hand, if the mobile communication network where the calling mobile terminal and the terminating mobile communication terminal are located is not identical to each other, voice traffic is a PCM (64Kbps) with a common rate of transmission regardless of the voice coding scheme supported by each mobile communication network. Pulse Code Modulation) transmits the call by transcoding the data. Here, PCM is most commonly used as a modulation method that converts a signal such as analog data into a binary signal in order to transmit a data sequence purely 0 and 10,000 like a computer file. Analog signal systems associated with computers are now stored and transmitted on a PCM basis.

Unlike the case in which the mobile communication networks are the same, transcoding is performed in each mobile communication network if the mobile communication networks are not identical to each other. Accordingly, data transformation and voice quality deterioration and delay may occur. Therefore, in order to solve this technically, each mobile communication network promises information on the codecs supported between the calling network and the called network, or the voice codec information can be negotiated with each other in call setup and traffic conditions. This is introduced. The typical technologies are the Third Generation Partnership Project (3GPP) / 3 Third Generation Partnership Project2 (TFG) or TrFO (Transcoder Free Operation) proposed by the 3GPP (Third Generation Partnership Project2). It is a standardized method for making a call between a network and a called network. 3GPP, a standardization organization for Wideband Code Division Multiple Access (WCDMA), uses the Out of Band Control of Transcoder method to negotiate voice codecs between both ends of in-band TFO technology. TrFO technology is adopted as standard. However, since the WCDMA network and the CDMA network are separate networks, there is a problem that a voice call is performed after two transcoding processes when a call is transmitted and received on each network.

1 is a flowchart illustrating a method for establishing a call transmitted and received between a calling terminal and a called terminal respectively located in a WCDMA network and a CDMA network according to the prior art.

In step S110, an outgoing mobile communication terminal located in a WCDMA network, which is a calling network, connects a call to a called mobile communication terminal located in a CDMA network, which is a called network. In step S120, in the WCDMA network, which is the originating network, the conventionally coded voice packet is transcoded into a commonly used PCM and transmitted to the CDMA network which is the destination network. In the WCDMA network, the digital signal by the PCM is compressed and coded using an adaptive multi-rate narrowband speech codec. In step S130, in the CDMA network, which is the destination network, the voice packets compressed and coded by the PCM described above are transcoded to be available in the voice codec used in the CDMA network. In a CDMA network, voice packets are compressed and coded by using a Qualcomm Code-Excited Linear Prediction (QCELP) and Enhanced Variable Rate Coder (EVRC) codec. In step S140, the incoming mobile communication terminal located in the CDMA network receives the above-mentioned voice packet, and the call is performed between the terminals. Therefore, since each network undergoes a separate transcoding process, there is a problem that data transformation and quality deterioration and delay according to coding and decoding may occur.

Accordingly, an object of the present invention is to provide a method and apparatus for establishing a call by transmitting and receiving a call without transcoding between a mobile communication terminal located in a WCDMA network and a mobile communication terminal located in a CDMA network. It is.

Another object of the present invention is to provide a method and apparatus for handover by transmitting and receiving a call without transcoding when a mobile communication terminal moves between a WCDMA network and a CDMA network.

It is still another object of the present invention to process an incoming call when a WCDMA network and a CDMA network are connected to another network, and the transcoding of the voice packet is performed at the gateway connected to the other network, and the transcoding of the voice packet is performed between the WCDMA network and the CDMA network. A method and apparatus for establishing a call by transmitting and receiving a call without being performed are provided.

Other objects of the present invention will become more apparent through the preferred embodiments described below.

In order to achieve the above objects, according to an aspect of the present invention, it is possible to provide a method for establishing a call to be transmitted and received between the source terminal and the destination terminal respectively located in the WCDMA network and the CDMA network.

According to a preferred embodiment of the present invention, a method for establishing and receiving a call between a calling terminal and a called terminal located in a WCDMA network and a CDMA network, respectively, comprises: receiving call setting request information and voice codec information from the calling terminal at the calling exchange; Detecting, by the originating exchange, information on the destination exchange in which the called terminal is registered according to the call establishment request information, and the originating exchange transmitting the call establishment request information and the voice codec information to the detected destination exchange. And the destination exchange transmitting the received call setup request information and the voice codec information to the called terminal, and the call setup corresponding to the voice codec information determined by the called terminal and the call setup request information among the voice codec information. Receive response information and send it to the calling terminal Transmitting, and in response to the call setup response signal and the determined voice codec information, the called exchange and the calling exchange set up a call path between the calling terminal and the called terminal bypassing each transcoder. It may include.

Here, the WCDMA network and any one or more of the CDMA network is connected to the other network in the incoming call, the WCDMA network and the gateway of any one of the CDMA network is connected to the other network in the gateway Transcoding may be performed, and the other network may be a public telephone network (PSTN).

In order to achieve the above objects, according to another aspect of the present invention, it is possible to provide a method for setting up a call transmitted and received between a calling terminal and a called terminal located in a WCDMA network and a CDMA network, respectively.

According to a preferred embodiment of the present invention, a method for establishing a call transmitted and received between a calling terminal and a called terminal located in a WCDMA network and a CDMA network, respectively, transmitting call setting request information and voice codec information to the calling exchange at the calling terminal, Determining voice codec information to be used for the corresponding call among the voice codec information received at the called terminal, and the called terminal transmits the call setting response information corresponding to the determined voice codec information and the call setup request information to the called exchange. The calling terminal may include transmitting a voice call by using the determined voice codec information. When voice codec information is exchanged between the calling terminal and the called terminal, the calling exchange and the called exchange may respectively be used. To set up a voice call to bypass the transcoder The.

Wherein the originating exchange may be a WCDMA exchange, the terminating exchange may be a CDMA exchange, and conversely, the originating exchange may be a CDMA exchange, and the terminating exchange may be a WCDMA exchange.

Here, the voice codec information may be transmitted in an inband or outband format, and the voice codec information may be information about a plurality of voice codecs stored in the calling terminal. The information may be determined according to a preset priority.

In order to achieve the above objects, according to another aspect of the present invention, it is possible to provide a method for a mobile communication terminal to handover between a WCDMA network and a CDMA network.

According to a preferred embodiment of the present invention, a method for handover between a WCDMA network and a CDMA network by a mobile communication terminal is performed when the first base international controller determines the strength of a signal received from the terminal to determine that the strength of the signal is weak. Transmitting a handover request signal including voice codec information being used by the terminal to an exchange, wherein the first exchange detects a second exchange of a network to which the terminal is to be handed over and requests the handover to the second exchange; Transmitting a signal, wherein the second exchange transmits the received handover request signal to a second base international controller, and the second base international controller receives the handover request signal and accesses the terminal; The second base international controller transmitting a handover completion signal of the terminal to the second exchange; Transmitting the handover complete signal to the first exchange, wherein the first exchange transmits a call release signal to a first base international controller and the first base station releases a call with the terminal. When voice codec information is exchanged between the first exchange and the second exchange period, the second exchange and the destination exchange may establish a voice communication path that bypasses each transcoder.

Here, the first switch and the first base station controller may be a WCDMA switch and a WCDMA base station controller, respectively, and the second switch and the second base station controller may be a CDMA switch and a CDMA base station controller, respectively. The switch and the first base station controller may each be a CDMA switch and a CDMA base station controller, and the second switch and the second base station controller may be a WCDMA switch and a WCDMA base station controller, respectively.

In order to achieve the above objects, according to another aspect of the present invention, it is possible to provide an apparatus for transmitting and receiving a call without transcoding between a WCDMA network and a CDMA network.

An apparatus for transmitting and receiving a call without transcoding between a WCDMA network and a CDMA network according to an exemplary embodiment of the present invention transmits and receives call establishment request information and voice codec information embedded in the terminal when a call is set up, and performs a handover during handover. A WCDMA base station controller and a CDMA base station controller for transmitting and receiving over request information and voice codec information embedded in the terminal with the exchange, transmitting and receiving call setup request information and voice codec information embedded in the terminal at the time of call setup, and handover. A WCDMA exchanger and a CDMA exchanger for transmitting and receiving handover request information and voice codec information embedded in the terminal, the WCDMA exchanger and the CDMA exchanger may set a voice call path for bypassing each transcoder.

Hereinafter, a method and apparatus for transmitting and receiving a call without transcoding between a WCDMA network and a CDMA network according to the present invention will be described in detail with reference to the accompanying drawings. Regardless of the sign, the same or corresponding components are given the same reference numerals and redundant description thereof will be omitted.

In the method for transmitting and receiving a call without transcoding between the WCDMA network and the CDMA network according to the present invention, the mobile communication between the WCDMA network and the CDMA network is performed by using voice codec information used in the calling mobile terminal. It is possible to avoid transcoding at the exchange. The method for transmitting and receiving a call without transcoding between a WCDMA network and a CDMA network according to the present invention can be divided into two types. One is a method for setting up a call from a calling mobile terminal to a receiving mobile terminal, and the other is a handover method when a mobile terminal moves between a WCDMA network and a CDMA network.

In addition, the method for transmitting / receiving a call without transcoding between the WCDMA network and the CDMA network according to the present invention may use the WCDMA network as the source network and the CDMA network as the destination network, and vice versa. In addition, in case of handover, it is possible to move from WCDMA network to CDMA network and vice versa. For convenience of explanation, the following description will focus on the case where the WCDMA network is the source network and the CDMA network is the destination network and when the WCDMA network is moved from the WCDMA network to the CDMA network.

2 is a schematic structural diagram of an overall system used in a WCDMA network and a CDMA network according to a preferred embodiment of the present invention. Referring to FIG. 2, the overall system used for the WCDMA network and the CDMA network includes a WCDMA Mobile Switching Center (MSC) 10, a WCDMA Radio Network Controller (RNC) 20, and a WCDMA Base Station (Node-). B) 30, Home Location Register (HLR) 40, CDMA Mobile Network Switching System (MSC) 50, CDMA Base Station Controller (BSC) 60, CDMA Base Station (BTS) Tranceiver System) 70, a terminal 80 located in the WCDMA network, and a terminal 90 located in the CDMA network.

The WCDMA mobile switching center 10 performs a subscriber's incoming / outgoing call processing function, a location registration procedure, a handover processing procedure processing function, and the like, and the WCDMA base station controller 20 is provided between the WCDMA mobile network switch 10 and the WCDMA base station 30. It is in charge of base station management and control. In addition, the WCDMA base station 30 is a network termination device that performs baseband signal processing, wired and wireless conversion, and transmission and reception of wireless signals, and is directly connected to the terminal 80 located in the WCDMA network. The subscriber location register 40 is a database that stores information on subscribers of the mobile communication service. The subscriber location register 40 provides the WCDMA mobile network switch 10 with information about the subscriber at the time of origination, location registration, and reception at the mobile communication terminal. do. In addition, the CDMA mobile network exchanger 50, the CDMA base station controller 60 and the CDMA base station 70 in the CDMA network also play a role as described above in the CDMA network, which is readily available to those skilled in the mobile communication field. If the above role as a configuration that can be implemented, it can be implemented in the present invention is obvious.

In addition, the terminal 80 located in the WCDMA network and the terminal 90 located in the CDMA network are DBDM (Dual Band Dual Mode) capable of embedding both the AMR codec, which is the voice codec of WCDMA, and the QCELP, EVRC codec, which is the voice codec of the CDMA. ) Terminal. In this case, the DBDM terminal may include a WCDMA chip (AMR codec, etc.) and a CDMA chip (QCELP, EVRC codec, etc.) as different chips, or may include all of the above codecs in a single chip, and may be used in WCDMA and CDMA. It is obvious that the present invention can be applied to preferred embodiments of the present invention as long as the voice data can be processed.

3A to 3C are format diagrams of data transmitted and received between a WCDMA network and a CDMA network according to a preferred embodiment of the present invention. 3A is a format diagram of a call setup request signal between a WCDMA network and a CDMA network according to a preferred embodiment of the present invention, and FIG. 3B is a format diagram of a call setup response signal between a WCDMA network and a CDMA network according to a preferred embodiment of the present invention. 3B is a format diagram of a handover request signal between a WCDMA network and a CDMA network according to a preferred embodiment of the present invention.

Referring to FIG. 3A, the call setup request signal includes voice codec information and call setup request information. Referring to FIG. 3B, the call setup response signal may include voice codec information and call setup response information. The call setup request information is information for requesting to set up a call from a terminal 80 located in a WCDMA network to a terminal 90 located in a CDMA network, and the WCDMA mobile network switch 10 and the CDMA mobile network switch 50 use this to make a call. And the call setup response information is information that responds to call setup in response to the call setup request information. In addition, the voice codec information is information indicating a standard to be coded voice data transmitted and received between the terminal 80 located in the WCDMA network and the terminal 90 located in the CDMA network. The voice codec information may be a list of voice codecs including one or more information about a voice codec embedded in the terminal 80 located in the WCDMA network, and then determine a voice codec supported by the terminal 90 located in the CDMA network.

Therefore, the voice codec information used in the terminal 80 located in the WCDMA network is transmitted to the terminal 90 located in the CDMA network, and the terminal 90 located in the CDMA network determines the voice codec information to be compressed and coded. As a result, the WCDMA mobile switching center 10 and the CDMA mobile switching center 50 may not perform transcoding.

Referring to FIG. 3C, the handover request signal may include voice codec information, handover request information, and moving base station information. The voice codec information is information of the voice codec which is continuously used in the terminal 90 located in the CDMA network even after the handover is terminated. The handover request information is an area of the CDMA mobile network switch 50 where the terminal 80 located in the WCDMA network is located. In the case of moving to the UE, information for requesting handover is performed. The moving base station information is information on the CDMA mobile network switch 50.

4 is a flowchart illustrating a method of setting up a call transmitted and received without transcoding between a calling terminal and a called terminal located in a WCDMA network and a CDMA network, respectively, according to a preferred embodiment of the present invention.

In step S410, the terminal 80 located in the WCDMA network makes a call setup request by transmitting a call setup request signal to the WCDMA mobile network switch 10 via the WCDMA base station 30 and the WCDMA base station controller 20. At this time, the call setup request signal includes voice codec information that can be supported by a codec embedded in the terminal 80 located in the WCDMA network. Here, the signaling method including the voice codec information may be an inband signaling method in which signal information and user data are transmitted on the same channel, and the outband signaling method in which signal information and user data are transmitted on different channels. This can be

In step S420, the WCDMA mobile switching center 10 performs a call progress procedure in response to a call establishment request signal of the terminal 80 located in the WCDMA network. In step S430, the WCDMA mobile switching center 10 obtains routing information up to the CDMA mobile switching center 50 by performing a procedure for locating the terminal 90 located in the CDMA network.

In step S440, the WCDMA mobile switching center 10 sends a call setup request signal to the CDMA mobile switching center 50 to proceed with the call switching request procedure. Here, the call setup request signal transmitted to the CDMA mobile network switch 50 includes voice codec information that can be supported by a codec embedded in the terminal 80 located in the WCDMA network. In step S450, the CDMA mobile network switch 50 transmits a call setup request signal to a terminal 90 located in a CDMA network, which is a called terminal, to perform an incoming call setup request procedure, wherein the call setup request signal is also described in the above-described voice codec information. It includes.

In step S460, the terminal 90 located in the CDMA network analyzes voice codec information included in the received call setup request signal, and the voice codec information includes a list of voice codecs available in the terminal 90 located in the CDMA network. If so, it is determined whether or not it is available according to a preset priority, and after determining voice codec information to be used for the call transmitted from the terminal 80 located in the WCDMA network, and transmitting the response signal to the CDMA mobile network switch 50. Perform the requirements confirmation procedure. The criterion for setting the priority of the availability of the voice codec information is set based on the voice codec embedded in the terminal 90 located in the CDMA network, and the codec previously used in the terminal 90 located in the CDMA network. Can be set and other setters can be set arbitrarily.

In step S470, the CDMA mobile switching center 50 transmits a call setup response signal including voice codec information determined and transmitted from the terminal 90 located in the CDMA network to the WCDMA mobile switching center 10 to perform a response procedure for call setup. After performing in step S480, the terminal 80 located in the WCDMA network, the WCDMA mobile switching center 10, the CDMA mobile switching center 50, and the terminal 90 located in the CDMA network are determined by the terminal 90 located in the CDMA network. Calls are connected by a voice codec according to the transmitted voice codec information.

Therefore, in response to the call setup response signal and the determined voice codec information, the called exchange and the calling exchange may establish a call path between the calling terminal and the called terminal bypassing each transcoder.

FIG. 5 is a flowchart illustrating a method of performing a handover between a WCDMA network and a CDMA network without transcoding by a mobile terminal in a call according to an exemplary embodiment of the present invention.

In step S510, when the terminal 80 located in the WCDMA network moves to the CDMA network, the signal strength in the WCDMA network becomes weak and the signal strength in the CDMA network becomes strong, so that the terminal 80 located in the WCDMA network becomes a WCDMA base station. The handover request procedure is initiated by sending a handover request signal to the WCDMA mobile switching center 10 via the controller 20. Here, the handover request signal transmitted from the terminal 80 located in the WCDMA network to the WCDMA mobile network switch 10 includes voice codec information being used by the terminal 80 located in the moving WCDMA network.

In step S520, the WCDMA mobile network switch 10 initiates a switching period handover request procedure by transmitting a handover request signal received from the terminal 80 located in the WCDMA network to the CDMA mobile network switch 50. Here, as described above, the handover request signal received by the CDMA mobile network switch 50 includes voice codec information being used by the terminal 80 located in the moving WCDMA network.

In step S530, the CDMA mobile network switch 50 transmits the received handover request signal to the CDMA base station controller 60.

In step S540, the CDMA base station controller 60 extracts the voice codec information after the terminal 90 located in the CDMA network receives the handover request signal from the CDMA base station controller 60, and stores the codec information currently in use. do. Further, the handover response signal is transmitted to the CDMA mobile network switch 50 through the CDMA base station controller 60. Herein, the mobile terminal moves from the WCDMA network to the CDMA network so that the terminal 80 located in the WCDMA network is referred to as a terminal 90 located in the CDMA network.

In step S550, the CDMA mobile switching center 50 performs the handover request acceptance procedure by transmitting the received handover response signal to the WCDMA mobile switching center 10, and in step S560, the WCDMA mobile switching center 10 performs the handover. The handover execution instruction procedure is performed by transmitting a handover response signal to the terminal 80 located in the WCDMA network with weak signal strength through the requested WCDMA base station controller 20.

In step S570, when the terminal 90 located in the CDMA network is connected to the CDMA base station, the CDMA base station controller 60 transmits a handover completion signal to the CDMA mobile network switch 50 to perform the handover completion procedure.

In step S580, the handover completion signal received by the CDMA mobile network switch 50 is transmitted to the WCDMA mobile network switch 10, and in step S590, the WCDMA mobile network switch 10 sends a call release signal to the WCDMA base station controller 20. The resource release procedure is performed by the transmission, and the handover is terminated.

Therefore, when voice codec information is exchanged with the first exchange during the second exchange period, the destination exchange, which has been previously established with the second exchange and with the first exchange, can establish a voice communication path that bypasses each transcoder. have.

According to another embodiment of the present invention, when the terminal 80 located in the WCDMA network moves from the WCDMA mobile network to the CDMA mobile network, the terminal 90 located in the CDMA network selects a new wireless channel in the region of the CDMA mobile network switch 50. After the handover request signal is transmitted to the CDMA mobile network switch 50, the handover is requested. Here, the handover request signal transmitted from the terminal 90 located in the CDMA network to the CDMA mobile switching center 50 includes voice codec information being used by the terminal 80 located in the moving WCDMA network.

After receiving the handover request signal, the CDMA mobile network switch 50 queries the subscriber location register 40 to determine in which zone of the switch the terminal 90 located in the CDMA network has moved. As a result of the inquiry, the CDMA mobile switching center 50 requests the WCDMA mobile switching center 10 to terminate the call established in the terminal 90 located in the CDMA network, and the WCDMA mobile switching center 10 communicates with the terminal 90 located in the CDMA network. Terminate the currency. Thereafter, the WCDMA mobile network switch 10 performs the handover completion procedure by transmitting a handover completion signal to the terminal 90 located in the CDMA network.

Here, the handover request signal transmitted by the terminal 80 located in the WCDMA network may include voice codec information and handover request information. Since the terminal 80 located in the WCDMA network transmits a handover request signal to the CDMA mobile network switch 50, unlike the illustrated in FIG. 3C, the terminal 80 may not include moving base station information.

6 is a schematic structural diagram of an overall system used between a WCDMA network, a CDMA network, and a public telephone network according to a preferred embodiment of the present invention. Referring to FIG. 6, the overall system according to the present invention further includes a gateway 610, a public switched telephone network (PSTN) switch 620, and a wired terminal 630 in the entire system shown in FIG. 2.

The gateway 610 is a device for converting a data packet used in a mobile communication network commonly used to data of a public communication network and vice versa, and a public switched telephone network (PSTN) switch 620 is a switch located in a public telephone network. The wired terminal 630 is a telephone terminal connected to a public telephone network. Since the general wired terminal 630 does not have a codec of voice data embedded in the above-described DBDM terminal, when the other network such as a public switched telephone network (PSTN) network is connected to the WCDMA network or the CDMA network, the gateway 610 It is not possible to send and receive calls without transcoding according to the present invention. Therefore, when one or more of the WCDMA network and the CDMA network are connected to another network to process an incoming call transmitted from a public telephone network, transcoding is performed at the gateway to which one of the WCDMA network and the CDMA network is connected to the other network. As described above, transcoding is not performed between the WCDMA network and the CDMA network. In the above, the case where the other network is a public telephone network has been described, but it is obvious that the other network may be applied to a voice packet network (VoIP), which is a wireless or wired Internet network.

FIG. 7A is a comparison diagram comparing a call setup method between a WCDMA network and a CDMA network according to a preferred embodiment of the present invention with a call setup method according to the prior art, and FIG. 7B is a WCDMA network and a CDMA according to a preferred embodiment of the present invention. It is a comparison chart comparing the method of handover to manganese with the method of handover according to the prior art.

Referring to FIG. 7A, when a call is established between a WCDMA network and a CDMA network, voice data is transmitted and received through transcoding in both the WCDMA mobile network switch 10 and the CDMA mobile network switch 50 according to the prior art. In contrast, according to the present invention, transcoding is not performed anywhere in the WCDMA mobile switching center 10 and the CDMA mobile switching center 50, and voice data is transmitted and received.

Referring to FIG. 7B, when handing over a WCDMA network and a CDMA network, according to the prior art, transmission and reception of a signal during the exchange period with the WCDMA mobile network switch 10 are not transcoded, but the WCDMA mobile network switch 10 and the CDMA In the mobile switching center 50, all of the signals are transceived through transcoding. On the other hand, according to the present invention, the signal is transmitted and received without transcoding anywhere in the WCDMA mobile switching center 10 and the CDMA mobile switching center 50.

The present invention is not limited to the above embodiments, and many variations are possible by those skilled in the art within the spirit of the present invention.

As described above, a method and apparatus for transmitting and receiving a call between a WCDMA network and a CDMA network according to the present invention transmit and receive a call without transcoding between a mobile communication terminal located in a WCDMA network and a mobile communication terminal located in a CDMA network. Can be set.

A method and apparatus for transceiving a call without transcoding between a WCDMA network and a CDMA network according to the present invention can transmit and receive a call without transcoding and handover when a mobile communication terminal moves between a WCDMA network and a CDMA network. .

A method and apparatus for transceiving a call without transcoding between a WCDMA network and a CDMA network according to the present invention, when the WCDMA network and a CDMA network are connected to another network to process an incoming call, transcoding voice packets in a gateway connected to the other network. In this case, the WCDMA network and the CDMA network can transmit and receive calls without transcoding voice packets and establish a call.

Claims (13)

A method for establishing a call transmitted and received between a calling terminal and a called terminal located in a WCDMA network and a CDMA network, respectively, Receiving call setup request information and voice codec information from the originating terminal at an originating exchange; Detecting terminating exchange information in which the terminating terminal is registered according to the call establishment request information at the originating exchange; The originating exchange transmitting the call establishment request information and the voice codec information to the detected destination exchange; Sending, by the destination exchange, the received call establishment request information and the voice codec information to the destination terminal; Receiving voice codec information determined by the called terminal and call setup response information corresponding to the call setup request information among the voice codec information and transmitting the same to the calling terminal; And In response to the call setup response signal and the determined voice codec information, the called exchange and the calling exchange include establishing a call path between the calling terminal and the called terminal bypassing each transcoder. A method for establishing a call without transcoding between a WCDMA network and a CDMA network. The method of claim 1, In order to process an incoming call by connecting at least one of the WCDMA network and the CDMA network to another network, And the voice call is transcoded at a gateway in which either one of the WCDMA network and the CDMA network is connected to the other network, and transcoding is performed between the WCDMA network and the CDMA network. The method of claim 2, And the other network is a public telephone network (PSTN). A method for establishing a call transmitted and received between a calling terminal and a called terminal located in a WCDMA network and a CDMA network, respectively, Transmitting call setup request information and voice codec information to an originating exchange at the originating terminal; Determining voice codec information to be used for a corresponding call among the voice codec information received by the called terminal; Transmitting, by the destination terminal, call setup response information corresponding to the determined voice codec information and the call setup request information to a destination exchange; And The originating terminal comprises the step of transmitting a voice call using the received voice codec information, When voice codec information is exchanged between the calling terminal and the called terminal, the calling exchange and the called exchange establish a voice call path for bypassing each transcoder, transcoding between the WCDMA network and the CDMA network. How to set up an arc without. The method according to claim 1 or 4, Wherein the originating exchange is a WCDMA exchange and the terminating exchange is a CDMA exchange; and wherein a call is established without transcoding between the WCDMA network and the CDMA network. The method according to claim 1 or 4, Wherein the originating exchange is a CDMA exchange and the terminating exchange is a WCDMA exchange; and wherein a call is established without transcoding between the WCDMA network and the CDMA network. The method according to claim 1 or 4, And the voice codec information is transmitted in an inband or outband format without transcoding between the WCDMA network and the CDMA network. The method according to claim 1 or 4, And the voice codec information is information on a plurality of voice codecs stored in the calling terminal without transcoding between the WCDMA network and the CDMA network. The method according to claim 1 or 4, And the voice codec information is determined according to a preset priority, without a transcoding between a WCDMA network and a CDMA network. In the method of the mobile terminal handover between the WCDMA network and the CDMA network, Transmitting a handover request signal including voice codec information being used by the terminal to the first exchange when the signal strength is determined to be weak by determining the strength of the signal received from the terminal; The first switch detecting the second switch of the network to which the terminal is to be handed over and transmitting the handover request signal to the second switch; Sending, by the second exchange, the received handover request signal to a second base international controller; The second base international controller accessing the terminal after receiving the handover request signal; The second base international controller transmitting a handover complete signal of the terminal to the second exchange; The second exchange sending the handover complete signal to the first exchange; The first exchange sending a call release signal to the first base international controller and the first base station releasing the call with the terminal, When the voice codec information is exchanged between the first exchange and the second exchange period, the second exchange and the destination exchange establish a voice call path for bypassing each transcoder. How to handover without transcoding in. The method of claim 10, The first switch and the first base station controller are each a WCDMA switch and a WCDMA base station controller, and the second switch and the second base station controller are respectively a CDMA switch and a CDMA base station controller. How to handover without transcoding. The method of claim 10, The first switch and the first base station controller are each a CDMA switch and a CDMA base station controller, and the second switch and the second base station controller are each a WCDMA switch and a WCDMA base station controller. How to handover without transcoding. An apparatus for transmitting and receiving a call without transcoding between a WCDMA network and a CDMA network, WCDMA base station controller and CDMA base station controller for transmitting and receiving call setup request information and voice codec information embedded in the terminal with the exchange, and handover request information and voice codec information embedded in the terminal with the exchange during handover. ; And a WCDMA exchange and a CDMA exchange which transmit and receive call establishment request information and voice codec information embedded in the terminal when establishing the call, and transmit and receive handover request information and voice codec information embedded in the terminal when handover. , And the WCDMA switch and the CDMA switch establish a voice call path for bypassing each transcoder, and transceiving a call without transcoding between the WCDMA network and the CDMA network.

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