KR100451404B1 - method for controlling communication service, and system for the same - Google Patents

Abstract

The present invention relates to a communication system, and more particularly, to a communication service control method for switching a connection of a service network according to a quality of service of communication networks in an environment in which communication networks defined by different protocols interoperate with each other. It is about a system for him. In particular, by converting the communication path to wireless network (especially CDMA network or GSM network) according to the quality of service (QoS) of wired network (especially IP network) for wired / wireless terminals based on Voice over Internet Protocol (VoIP) service It is an invention that provides a higher quality voice communication service.

Description

Method for controlling communication service, and system for the same

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a communication system. In particular, in an environment in which communication networks defined by different protocols interoperate with each other, the service network is switched according to the quality of service of the communication networks. The present invention relates to a communication service control method and a system therefor.

Conventionally, in service of a real-time application such as a voice call, there are a priority based method and a dual mode driving method as a method for guaranteeing the quality of service.

Priority-based QoS is a method of guaranteeing the quality of service by changing the priority of real-time applications, thereby processing voice, which is a real-time application, over data.

This approach focuses on how to efficiently use a fixed bandwidth for the characteristics and purpose of the application.

However, this method has some disadvantages in QoS when the network is in good condition, but it does not have any effect when the network becomes congested or down for some reason.

Dual-mode operation is different from wireless LAN (WLAN), 3GPP (3th Generation Partnership Project) code division multiple access (CDMA), wireless LAN (WLAN) and Global System for Mobile communications system (GSM). It is aimed at application service between networks.

That is, the service area of the WLAN provides a communication service according to the WLAN protocol, and the service quality is guaranteed by providing a communication service according to the CDMA protocol or the GSM protocol outside the service area of the WLAN.

However, this method only switches the communication service according to the location of the user terminal, and does not consider the QoS of the network in which the communication service is provided.

In addition, there is Quintum technologies, Inc.'s Voice over Internet Protocol (VoIP) gateway to ensure communication service quality.

Voice over Internet Protocol (VoIP) is a communication service technology that converts voice into a transportable Internet Protocol (hereinafter, referred to as IP) packet and enables a voice call on the Internet through an IP network.

The VoIP gateway method operates through a network connection between an IP network and a Public Switching Telecommunication Network (hereinafter referred to as PSTN).

When a wired terminal (wired telephone) is connected to the VoIP gateway, the VoIP gateway converts the incoming voice to match the VoIP, and delivers it to the IP network. Converts to voice and delivers to PSTN.

At this time, when delivering the voice converted into an IP packet to the IP network, the VoIP gateway checks the quality of the voice through the IP network. When the voice quality is notified from the IP network, the VoIP gateway switches the communication service from the IP network to the PSTN without the user's feeling, thereby assuring the quality of service.

However, this only guarantees the quality of service for wireline terminals. And there is a limit to provide only the interworking between the IP network and the PSTN for voice calls.

Accordingly, an object of the present invention has been devised in view of the above-mentioned point. In particular, in the environment in which communication networks defined by different protocols interoperate, the quality of service (QoS) of the communication networks is measured, and the The present invention provides a method and system for controlling a communication service suitable for converting a connection into a useful network.

Communication service control method according to the present invention for achieving the above object, the first step of transmitting the voice signal received from the CDMA phone to the IP network, the second step of monitoring the quality of service of the IP network, And a third step of switching the communication path of the CDMA phone to the CDMA network according to the quality of service (QoS) of the monitored IP network.

Preferably, after the third step, as the quality of service of the IP network is restored to the level at which communication service is available, the method further includes the step of returning the communication path of the CDMA phone from the CDMA network to the IP network.

Another feature of the communication service control method according to the present invention for achieving the above object is a first step of transmitting a voice signal received from a landline telephone to the IP network, and monitoring the quality of service of the IP network And a third step of converting the communication path of the wireline telephone into the CDMA network according to the quality of service (QoS) of the monitored IP network.

Preferably, the first step converts the voice signal received from the wireline telephone into a CDMA signal conforming to the transmission standard of the CDMA network and delivers it to the IP network. That is, the 64kbps PCM signal received from the landline is converted into an 8kbps CDMA signal.

Communication service control system according to the present invention for achieving the above object, in the communication service based on voice communication (VoIP) to the Internet Protocol (IP) network, CDMA phone, wired telephone and the IP network It is characterized by consisting of an adaptive gateway to monitor the quality of service of the, and to switch the communication path of the CDMA phone or wireline telephone according to the quality of service of the IP network.

Preferably, the adaptive gateway monitors the quality of service of the IP network and, according to the service quality monitor / controller for instructing communication path switching according to the quality of service of the IP network, according to the command of the quality of service monitor / controller, And a selector for switching the communication path of the CDMA phone or the wireline telephone to a CDMA network, and a vocoder for converting a voice signal received from the wireline telephone into a CDMA signal conforming to the transmission standard of the CDMA network.

In particular, the selector is a CSM chipset (Cell Site Modem chipset) and MSM chipset (Mobile System Modem chipset) for switching the communication path of the CDMA phone or wireline telephone to a CDMA network, and the communication path switching command of the service quality monitor / controller The controller is configured to control the CSM chipset and the MSM chipset to convert the communication path of the CDMA phone or the wired telephone into a CDMA network.

In addition, the selector consisting of the CSM chipset, the MSM chipset and the controller and the quality of service monitor / controller are manufactured as a single module, and the MSM chipset is configured to convert the communication path of the wired telephone into the CDMA network. Call setup to the CDMA network is performed.

1 is a diagram showing a comprehensive configuration of a system for communication service control according to the present invention.

2 is a diagram illustrating a system configuration for controlling a communication service according to an embodiment of the present invention.

3 is a flowchart illustrating a communication service control procedure according to a first embodiment of the present invention.

4 is a flowchart illustrating a communication service control procedure according to a second embodiment of the present invention.

<Description of Symbols for Main Parts of Drawings>

100: adaptive gateway

110: RF unit

111: micro base station (Nano BTS) 112: micro control station (Nano BSC)

120: adaptive controller

121: 1st Vocoder 122: 2nd Vocoder

130: Internet Protocol (IP Unit)

131: Packetizer / Depacketizer

132: Quality of Service (QoS monitor / controller)

140: selector 200: wireless terminal

300: Wireline Terminal 400: Wireless Network

500: Wireline Network

Hereinafter, a preferred embodiment of a communication service control method and a system therefor according to the present invention will be described with reference to the accompanying drawings.

1 is a view showing a comprehensive configuration of a system for communication service control according to the present invention.

Referring to Figure 1 will be described the system configuration and operation of the components of the present invention.

The service control system of the present invention is composed of an adaptive gateway (100), a terminal (200, 300), a wireless network (400), and a wired network (500).

The terminals 200 and 300 include a wireless terminal 200 that communicates through an air interface, and a wireline terminal 300 that communicates through a communication line.

The wireless terminal 200 is a conventional mobile terminal with guaranteed mobility, such as a CDMA phone conforming to the CDMA protocol or a GSM phone conforming to the GSM protocol.

The wired terminal 300 is a terminal for which a communication line is required, such as a wired telephone or a personal computer. In particular, in the case of landline telephones, analog phones and digital phones are used. The present invention has a device configuration for converting a signal of an analog telephone into a digital signal (PCM), which will be described later.

A WLAN phone or a Bluetooth phone is also used as the terminal of the present invention, and a PDA equipped with a CDMA card is also used as the terminal of the present invention.

The adaptive gateway 100 includes a radio unit (RF unit) 110 serving as a base station (BTS) and a control station (BSC) of a wireless network system conforming to a wireless communication protocol, and controls communication service of the present invention. It further comprises an adaptive controller (120), an IP unit (130) and a selector (140) for the adaptive controller.

The wireless terminal 110 is a micro base station (Nano BTS) 111 that serves as a base station of the wireless network 400, and a micro control station (NanoBSC) 112 that serves as a control station of the wireless network 400. It consists of. The micro base station 111 and the micro control station 112 have a reduced service capacity according to the number of users compared to the base station and the control station of the wireless network 400. In particular, the micro base station 111 has a built-in repeater (repeater) responsible for signal amplification and relay.

In particular, the nano base station (Nano BTS) 111 and the wireless terminal 200 forms a dedicated channel (dedicated channel) to communicate. In other words, the radio terminal 200 is preferentially communicatively connected with the nano base station (Nano BTS) 111 by default.

The adaptive controller 120 includes a first vocoder 121, a second vocoder 122, and a controller 123. The first vocoder 121 converts the audio signal of the analog wired terminal into a signal conforming to the transmission standard of the digital wired terminal, and the second vocoder 122 converts the signal of the analog wired terminal into a signal of the digital wired terminal and the digital wired terminal. This converts the signal into a signal conforming to the transmission standard of the wireless network 400. In addition, a coder / decoder (not shown) for coding data flowing from the wired terminal 300 or decoding a data packet to be transmitted to the wired terminal 300 is also provided in the adaptive controller 120.

Referring to the vocoding examples by the adaptive controller 120, the controller 123 analyzes whether the incoming audio signal of the wired terminal 300 is an analog signal or a digital signal. If the incoming signal is an analog signal, the signal path is opened to the first vocoder 121 for the incoming signal. Then, the first vocoder 121 converts the incoming analog voice signal into a digital voice signal (e.g. 64 kbps PCM signal) and transfers it to the second vocoder 122. Accordingly, the second vocoder 122 converts the input digital voice signal into a signal conforming to the transmission standard of the wireless network.

On the other hand, if the incoming signal is a digital signal (e.g. 64kbps PCM signal), the controller 123 opens a signal path to the second vocoder 122 for the incoming signal. Then, the second vocoder 122 converts the input digital voice signal into a signal conforming to the transmission standard of the wireless network.

The second vocoder 122 decodes the voice packet to be transmitted to the wired terminal 300 into a digital signal conforming to the standard of the digital wired terminal. When the decoded digital signal is a signal to be transmitted to the analog wired terminal, the first vocoder 121 converts the digital signal converted by the second vocoder 122 back to an analog signal.

As a further example, if the wireless network 400 is a CDMA network and data is input from a wired terminal 300 such as a computer, a coder / decoder (not shown) converts the input data into a signal according to the CDMA transmission standard. On the contrary, the data of the CDMA transmission standard to be transmitted to the wired terminal 300 is converted into a PCM signal conforming to the standard of the wired terminal 300.

As another example, when the wireless network 400 is a CDMA network and a voice signal (64 kbps PCM signal) is input from a wired telephone, the second vocoder 122 converts a 64 kbps PCM (Pulse Code Modulation) signal into a 8 kbps CDMA signal. . On the contrary, it converts 8kbps CDMA signal to 64kbps PCM signal. However, since the wired terminal 300 does not always use only a 64kbps PCM signal, in the present invention, the second vocoder 122 converts a signal (WLAN signal), which is not a 64kbps PCM signal, into a 64kbps PCM signal, Again converted to a CDMA signal of 8kbps. That is, the second vocoder 122 converts the 8X (X is a natural number) kbps PCM signals into a basic 64 kbps PCM signal and then converts the 8 kbps CDMA signal.

The controller 123 of the adaptive controller 120 also changes the output path of the second vocoder 122 when it receives a handoff command. That is, when a handoff command is received for the signal being transmitted to the IP network, the output path of the second vocoder is changed to be transmitted to the wireless network, and conversely, the handoff recovery is performed for the signal being transmitted to the wireless network after the handoff. Upon receiving the command, the output path is changed to transmit the output signal of the second vocoder to the IP network.

In addition, when the handoff for the signal being transmitted to the IP network is completed, the controller 123 disconnects the output path to the IP network side. After the handoff recovery for the signal being transmitted to the wireless network is completed, the controller 123 disconnects the output path to the radio only side.

The following IP unit 130 is composed of a packetizer / depacketizer 131 and a QoS monitor / controller 132. The packetizer / depacketizer 131 converts a signal going to the wired network 500 into a packet conforming to the transmission standard of the wired network 500 or releases a packet coming from the wired network 500.

The QoS monitor / controller 132 monitors the QoS of the wired network 500 after the packet is delivered to the wired network 500 and manages the handoff from the monitoring data. In more detail, if the QoS of the wired network 500 is detected by the cause for some reason, the QoS monitor / controller 132 operates in conjunction with the selector 140, which will be described later, to the terminal currently sending a signal. Handoff is performed, and signal transmission to the wired network 500 is controlled.

As an example, when the wireless network 400 and the wired network 500 are CDMA networks and IP networks, respectively, and the CDMA voice signals are packetized and transmitted from the CDMA terminal as the wireless terminal 200 to the IP network, If a failure of the IP network is detected, the QoS monitor / controller 132 interworks with the selector 140 to hand off signal transmission to the IP network to the CDMA network.

As another example, the wireless network 400 and the wired network 500 are CDMA networks and IP networks, respectively, and the PCM voice signals are transmitted from the wired telephone as the wired terminal 300, and then converted into CDMA voice signals and transmitted as packets to the IP network. When the failure of the IP network is detected, the QoS monitor / controller 132 interworks with the selector 140 to hand off signal transmission to the IP network to the CDMA network.

The selector 140 mentioned above performs an actual handoff from the wired network 500 to the wireless network 400 in cooperation with the wireless terminal 110 under the direction of the QoS monitor / controller 132.

In particular, the selector 140 operates as if the wireless terminal calls the wireless network 400 for a handoff to the wireless network 400 for the wired terminal 300, thereby making a call to the wireless network 400. Perform call initiation / setup. In more detail, in order to hand off the signal transmission from the wired terminal 300 to the wired network 500 to the wireless network 400, it is possible after call setup is completed between the wired terminal 300 and the wireless network 400. . Therefore, the selector 140 replaces the call setup with the wireless network 400 of the wired terminal 300. In particular, the MSM chipset to be described below replaces call establishment with the wireless network 400 of the wired terminal 300.

When the wireless network 400 is a CDMA network, the selector 140 includes a CSM chipset, a mobile system modem chipset, and a controller. Of course, the wireless terminal 100 is a CDMA terminal.

The CSM chipset is a chipset embedded in a base station (BTS), which is a component of a CDMA network. The CSM chipset performs a call setup and traffic transmission in conjunction with a CDMA terminal and includes an MSM embedded in the selector 140. Works with the chipset to perform handoffs.

The MSM chipset is the same as the MSM chipset embedded in the CDMA terminal, and performs call setup, traffic transmission, and coding / decoding or vocoding in conjunction with a base station (BTS), which is a component of the CDMA network. In particular, it works with the CSM chipset to perform handoffs.

In the present invention, the CSM chipset and the MSM chipset may be mounted inside the micro base station 111. That is, when the micro base station 111 includes the selector 140, unlike the base station of the existing CDMA network, only the CSM chipset is included, the micro base station 11 of the present invention includes both the CSM chipset and the MSM chipset together.

The controller causes the CSM chipset and the MSM chipset to perform a substantial handoff when a handoff command is issued from the QoS monitor / controller 132 and initializes the CSM chipset and the MSM chipset when the handoff ends. When the handoff ends, the handoff completion is notified to the adaptive controller 120 and the QoS monitor / controller 132.

As such, when the selector 140 is composed of a CSM chipset, an MSM chipset, and a controller, the MSM chipset has functions of a coder / decoder (not shown) and vocoders 121 and 122, so that separate coders / decoders and vocoders may be configured. no need. 1 illustrates a logical configuration. However, the first vocoder 121 is configured separately due to vocoding characteristics.

In the present invention, preferably, the selector 140 having the CSM chipset, the MSM chipset, and the controller is implemented as a module together with the QoS monitor / controller 130.

The wireless network 400 may be a CDMA network or a GSM network. The wired network may be an IP network or an Ethernet (ETHERNET).

The following describes a communication service control operation performed by the above components.

Basically, the wireless terminal 200 and the wired terminal 300 undergo a registration procedure with the adaptation gateway 100. Accordingly, the adaptation gateway 100 recognizes the target terminal to which it will serve. As an example, a phone number and / or device number uniquely assigned to each of the terminals 200 and 300 is registered in the adaptation gateway 100. Accordingly, when there is a signal currently being received, the adaptation gateway 100 may know whether the received signal is transmitted from a terminal that is already registered.

First, an example of a case in which the wireless terminal 200 is to transmit a voice signal to the wired network 500.

In order to send a voice signal, the wireless terminal 200 goes through a call setup procedure with the wireless terminal 110. As an example, signaling for call setup between the wireless terminal 200 and the wireless terminal 110 is based on a session initiation protocol (SIP) or the standard of ITU-T H.323.

After call setup, the voice signal of the wireless terminal 200 passes through the wireless terminal 110. The voice signal output from the wireless terminal 110 is passed to the packetizer / depacketizer 131 by bypassing the vocoders 121 and 122.

The packetizer / depacketizer 131 converts the voice signal output from the wireless terminal 110 into a packet conforming to the transmission standard of the wired network 500 and transmits the packet to the wired network 500.

At this time, the QoS monitor / controller 132 monitors the QoS of the wired network 500.

If for some reason it is detected that the QoS of the wired network 500 is deteriorated, the QoS monitor / controller 132 issues a seamless hand-off command to the controller 140 of the selector 140 and the adaptive controller 120. ) To the controller 123. However, even at this time, the voice signal of the wireless terminal 200 is transmitted to the wired network 500. That is, the controller 123 of the adaptive controller 120 newly opens the output path to the wireless terminal 110 while maintaining the output path of the second vocoder 122 to the existing wired network 500.

The controller of the selector 140 sends a seamless hand-off trigger / initiation message to the CSM chipset and the MSM chipset.

Accordingly, the CSM chipset and the MSM chipset perform a substantial handoff to the wireless network 400, thereby converting a path from which the wireless terminal 200 transmits a voice signal to the wired network 500 to the wireless network 400. . When the handoff is in progress, the voice signal of the wireless terminal 200 is simultaneously sent to the wired network 500. The handoff performed by the CSM chipset and the MSM chipset is the same hard handoff as recommended in the CDMA standard.

When the handoff to the wireless network 400 is completed, the controller of the selector 140 sends a disconnection handoff complete message to the adaptive controller 120 and the QoS monitor / controller 132. The QoS monitor / controller 132 then drops the path to the wired network 500 to which the voice signal of the wireless terminal 200 has been transmitted. The QoS of the wired network 500 is continuously monitored. The controller 123 of the adaptive controller 120 disconnects the output path to the wired network side of the second vocoder 122.

If it is detected that the QoS of the wired network 500 has been restored, the QoS monitor / controller 132 issues a seamless hand-off recovery command to the controller of the selector 140 and the adaptive controller 120. To the controller 123. However, also in this case, the voice signal of the wireless terminal 200 is transmitted to the wireless network 400, the packetizer / depacketizer 131 is enabled (enable). The controller 123 of the adaptive controller 120 newly opens the output path to the existing wired network side while maintaining the output path to the radio end 110 side after the handoff of the second vocoder 122.

The controller of the selector 140 transmits a seamless hand-off recovery trigger / initiation message to the CSM chipset and the MSM chipset.

Accordingly, the CSM chipset and the MSM chipset perform a substantial handoff to the wired network 500, thereby converting a path from which the wireless terminal 200 transmits a voice signal to the wired network 500 to the wired network 500. When handoff recovery is in progress, the voice signal of the wireless terminal 200 is simultaneously sent to the wireless network 400.

When handoff recovery to the wired network 500 is completed, the controller of the selector 140 forwards the disconnection handoff recovery complete message to the adaptive controller 120 and the QoS monitor / controller 132. The QoS monitor / controller 132 then drops the path to the wireless network 400 to which the voice signal of the wireless terminal 200 has been transmitted. The controller of the adaptive controller 120 disconnects the output path to the radio end side of the second vocoder 122. The QoS monitor / controller 132 continues to monitor the QoS of the wired network 500.

The following is an example of the case where the wired terminal 300 wants to transmit a voice signal to the wired network 500.

The wired terminal 300 transmits a voice signal to the adaptive gateway 100.

The vocoder 122 of the adaptive gateway 100 converts the received voice signal of the wired terminal 300 into a radio standard signal that conforms to the transmission standard of the wireless network 400, thereby packetizing / depacketizer 131. To pass.

The packetizer / depacketizer 131 converts the converted wireless standard signal into a packet conforming to the transmission standard of the wired network 500 and transmits the converted packet to the wired network 500.

At this time, the QoS monitor / controller 132 monitors the QoS of the wired network 500.

If for some reason a symptom of poor QoS of the wired network 500 is detected, the QoS monitor / controller 132 issues a seamless hand-off command to the controller 140 and the adaptive controller 120 of the selector 140. ) To the controller 123. However, even at this time, the voice signal of the wireless terminal 200 is transmitted to the wired network 500. That is, the controller 123 of the adaptive controller 120 newly opens the output path to the wireless terminal 110 while maintaining the output path of the second vocoder 122 to the existing wired network 500.

The controller of the selector 140 sends a seamless hand-off trigger / initiation message to the CSM chipset and the MSM chipset.

Accordingly, the MSM chipset operates as if the wireless terminal calls the wireless network 400 for the handoff to the wireless network 400 for the wired terminal 300, thereby initiating / setting up the call to the wireless network. call initiation / setup). As a result, the call setup to the wireless network 400 of the wired terminal 300 is successfully completed.

Thereafter, the CSM chipset and the MSM chipset perform a substantial handoff to the wireless network 400, thereby converting a path from which the wired terminal 300 transmits a voice signal to the wired network 500 to the wireless network 400. When the handoff is in progress, the voice signal of the wired terminal 300 is simultaneously sent to the wired network 500.

When the handoff to the wireless network 400 is completed, the controller of the selector 140 sends a disconnection handoff complete message to the adaptive controller 120 and the QoS monitor / controller 132. Then, the controller 123 in the adaptive controller 120 switches the output path of the second vocoder 122 to the radio end 110 side, and the QoS monitor / controller 132 has until the voice signal of the wired terminal 300 Drops the path to the wired network 500 that has been delivered. The QoS monitor / controller 132 continues to monitor the QoS of the wired network 500.

If it is detected that the QoS of the wired network 500 has been restored, the QoS monitor / controller 132 sends a seamless hand-off recovery command to the controller of the selector 140 and the adaptive controller 120. send. However, at this time, the voice signal of the wired terminal 300 is transmitted to the wireless network 400, and the packetizer / depacketizer 131 is enabled. The controller 123 of the adaptive controller 120 newly opens the output path to the existing wired network side while maintaining the output path to the radio end 110 side after the handoff of the second vocoder 122.

The controller of the selector 140 transmits a seamless hand-off recovery trigger / initiation message to the CSM chipset and the MSM chipset.

Accordingly, the CSM chipset and the MSM chipset perform a substantial handoff to the wired network 500, thereby converting a path from which the wired terminal 300 transmits a voice signal to the wireless network 400 to the wired network 500. When handoff recovery is in progress, the voice signal of the wired terminal 300 is simultaneously sent to the wireless network 400.

When handoff recovery to the wired network 500 is completed, the controller of the selector 140 sends a disconnection handoff recovery complete message to the adaptive controller 120 and the QoS supervisor / controller 132 and the MSM chipset is set up. The call of the wired terminal 300 that was present is released. Then, the controller 123 in the adaptive controller 120 switches the output path of the second vocoder 122 to the IP terminal 130 side, and the CSM chipset and the MSM chipset until the voice signal of the wired terminal 300 has been transmitted. The path to the wireless network 400 is dropped. The QoS monitor / controller 132 continues to monitor the QoS of the wired network 500.

Also, the important point is that when the QoS monitor / controller 132 monitors the QoS of the wired network 500, the threshold is set in advance and the handoff is determined based on the threshold.

Examples of the handoff determination of the QoS monitor / controller 132 will be described. First, the QoS monitor / controller 132 presets the first threshold value, the second threshold value, and the third threshold value for handoff.

If the QoS of the wired network 500 falls below the first threshold, it is determined that this is a symptom of poor QoS. When the QoS continues to decrease at a predetermined rate from the first threshold and reaches the second threshold, handoff is performed.

Thereafter, handoff recovery is only performed when the third threshold that is set to a value higher than the second threshold is stably exceeded. In this case, stably exceeding the QoS of the wired network 500 continuously increases the QoS at a predetermined rate from the second threshold rather than an unstable one such as swinging based on the third threshold, but exceeds the third threshold. Say. That is, in the present invention, even if the QoS of the wired network 500 exceeds the third threshold, seamless hand-off recovery is not always performed.

In the above description, the adaptive gateway 100 controls handoff. That is, the QoS monitor / controller 132 monitors the QoS of the wired network 500 and instructs a handoff command. However, the present invention also considers the case of instructing the handoff command from the terminal (200, 300) side. In this case, when the terminal 200 or 300 instructs the handoff command, the terminal user who is currently in the call determines that the call state is not good, and instructs the handoff command to the adaptive gateway 100.

The terminal 200 or 300 further includes a separate key for a handoff command, and when the user determines that the call state is not good for some reason, the user presses the handoff key to select a seamless hand-off command 140. To the controller.

Accordingly, the controller of the selector 140 transmits a seamless hand-off trigger / initiation message to the CSM chipset and the MSM chipset.

Subsequent operations are the same as the case where the adaptive gateway 100 controls the handoff, which has already been mentioned above, and handoff recovery is also performed by the QoS monitor / controller 132 of the adaptive gateway 100.

2 is a diagram illustrating a system configuration for controlling a communication service according to an embodiment of the present invention.

Referring to FIG. 2, the system of FIG. 2 is a configuration for controlling a communication service between a CDMA network and an IP network.

The service control system of the present invention is composed of an adaptive gateway, a CDMA phone, a landline telephone, a CDMA network, and an IP network.

The adaptive gateway includes a radio unit (RF unit) serving as a base station (BTS) and a control station (BSC) of a CDMA system conforming to the CDMA protocol, and an adaptive controller for controlling a communication service of the present invention. It further comprises an IP unit and a selector.

The radio end is composed of a nano base station (Bano) serving as a base station (BTS) of a CDMA network and a nano control station (Nano BSC) serving as a control station (BSC) of the CDMA network. The micro base station and the micro control station have reduced service capacity according to the number of users compared to the base station and the control station of the CDMA network.

And inside the micro base station is built a repeater (repeater) responsible for signal amplification and relay.

In particular, a nano base station (Nano BTS) and a CDMA phone forms a dedicated channel to communicate. In other words, the radio terminal 200 is preferentially communicatively connected with the nano base station (Nano BTS) 111 by default.

An adaptive controller is composed of a first vocoder, a second vocoder, and a controller.

Coders / decoders and vocoders convert wireline telephone applications (voice or data) into CDMA signals that conform to the CDMA transmission standard.

That is, the coder / decoder converts the data coming from the wireline telephone into a CDMA signal conforming to the CDMA transmission standard.

The first vocoder converts the analog signal flowing from the analog wireline telephone into a 64 kbps PCM signal and outputs it to the second vocoder. The second vocoder converts the 64kbps PCM signal from the digital wireline telephone or the first vocoder into an 8kbps CDMA signal for transmission to the IP network and transmits it to the IP stage.

However, since the application of the CDMA phone is already an 8kbps CDMA signal, there is no signal conversion of the vocoder to the signal of the CDMA phone. That is, bypasses the vocoder.

The controller of the adaptive controller changes the output path of the second vocoder according to the handoff command, and also directs the path to the vocoder to be signaled according to the characteristics of the signal coming from the landline.

An IP unit configured immediately before the next IP network includes a packetizer / depacketizer and a QoS monitor / controller.

In the present invention, the packetizer / depacketizer processes only a CDMA signal of 8 kbps. That is, the packetizer / depacketizer converts the 8kbps CDMA signal going to the IP network into a packet conforming to the transmission standard of the IP network or releases the IP packet from the IP network.

If the IP packet coming from the IP network packetizes a 64kbps PCM voice signal, the packet is not decoded after the packet is released. However, if the incoming IP packet is a packetized 8kbps CDMA signal, the vocoder decodes it into a 64kbps PCM signal after packet release.

The QoS monitor / controller monitors the QoS of the IP network after the packet is delivered to the IP network, instructs the handoff from the monitoring data, and when the handoff is completed, the IP network. Disconnects the path and restores the path of the IP network when QoS of the IP network is restored.

More specifically, QoS of an IP network can be deteriorated due to various factors such as transmission delay and packet loss. If the QoS monitor / controller determines that the transmission environment of the current IP network continues to be degraded because the QoS of the IP network falls below a predetermined first threshold, the QoS monitor / controller operates with a selector to transmit a current voice signal. Perform a handoff to (CDMA phone or landline phone).

As an example, when a CDMA voice signal of a CDMA phone is packetized and delivered to an IP network, if a failure of the IP network is detected, the QoS monitor / controller is connected to the selector to the IP network. Hand off the signal transmission to the CDMA network.

As another example, when a 64kbps PCM voice signal is transmitted from a wired telephone and then converted into an 8kbps CDMA voice signal and transmitted as a packet to the IP network, if a failure of the IP network is detected, the QoS monitor / controller is a selector. In conjunction with, hand off signal transmission to IP network to CDMA network.

The selector receives the handoff instruction from the QoS monitor / controller and performs a substantial handoff from the IP network to the CDMA network in association with the wireless terminal.

However, the wired telephone does not need to set up a separate call to send a voice signal to the IP network. However, in order to be handed off to the CDMA network, signal transmission is possible only after the wired telephone sets up a call to the CDMA network. However, fixed line telephones do not have a call setup function to the CDMA network, so the selector replaces them.

That is, the selector operates as if the CDMA phone is calling the CDMA network before handoff, for handoff to the CDMA network for the wired telephone, and performs call initiation / setup to the CDMA network. do.

Call setup or handoff for these landlines is made possible by the selector fitted with an MSM chipset and CSM chipset.

The CSM chipset performs call setup and traffic transmission of CDMA phones and landline phones, and works with the MSM chipset to perform handoffs.

The MSM chipset is also embedded in a CDMA phone and performs call setup, traffic transmission, and coding / decoding or vocoding in conjunction with a base station (BTS) of a CDMA network. In particular, it works with the CSM chipset to perform handoffs.

And inside the selector a controller is also mounted. The controller causes the CSM chipset and the MSM chipset to perform a substantial handoff when a handoff command is issued from the QoS monitor / controller, and initializes the CSM chipset and the MSM chipset when the handoff ends. And when the handoff ends, inform the adaptive controller and QoS monitor / controller of the handoff completion. Accordingly, the controller of the adaptive controller changes the output path of the second vocoder to the wireless network side, and the QoS monitor / controller disconnects the communication path to the IP network.

In this way, the selector is composed of the CSM chipset, the MSM chipset, and the controller, so that the selector may perform the functions of the coder / decoder and the vocoder or separately configure the coder / decoder and the vocoder.

Next, a communication service control procedure performed by the above components will be described with reference to FIGS. 3 and 4.

3 is a flowchart illustrating a communication service control procedure according to a first embodiment of the present invention, and relates to an example in which a voice signal of a CDMA phone is serviced through IP, such as Voice over IP (VoIP).

Basically, once the CDMA phone is registered with the adaptive gateway (S1).

If there is a request for transmission of a voice signal from the registered CDMA phone to the IP network (S2), call setup is once performed between the CDMA phone and the RF unit of the adaptive gateway (S3).

When call setup is completed (S4), a dedicated communication channel is formed between the CDMA phone and the radio terminal (S5). In other words, the CDMA phone is preferentially connected to a nano base station (Nano BTS) by default.

The CDMA phone transmits an 8kbps CDMA signal through the formed dedicated communication channel (S6), and the wireless end transmits the received 8kbps CDMA signal to the packetizer / depacketizer (S7).

The packetizer / depacketizer converts the input 8kbps CDMA signal into an IP packet according to a transmission standard of the IP network and then transfers the packet to the IP network (S8 and S9).

The QoS monitor / controller monitors the QoS of the IP network from the time point at which the dedicated communication channel is formed between the CDMA phone and the radio end (S10).

If the QoS of the IP network is degraded and the QoS continues to decrease even after falling below the first threshold set for determining whether to handoff (S11), the QoS monitor / controller selects a seamless hand-off command. Send to the controller of (S12).

At this time, the communication path of the CDMA phone maintains the IP network.

The controller of the selector delivers a seamless hand-off trigger / initiation message to the CSM chipset and the MSM chipset (S13).

Accordingly, the CSM chipset and the MSM chipset hand off the CDMA phone to the CDMA network (S14). That is, the CSM chipset and the MSM chipset switch the communication path so that the voice signal of the CDMA phone is received at the base station of the CDMA network.

When the handoff for the CDMA phone is completed (S15), the controller of the selector forwards the disconnection handoff complete message to the QoS monitor / controller (S16).

The QoS monitor / controller disconnects the communication path to the IP network in response to the disconnection handoff completion message being input (S17).

However, even after the QoS monitor / controller continues to monitor the QoS of the IP network (S18).

However, if the QoS of the IP network becomes good and the QoS continues to increase even after exceeding the set second threshold for determining whether to handoff (S19), the QoS monitor / controller performs an uninterrupted handoff recovery (S19). send a seamless hand-off recovery) command to the selector controller (S20).

At this time, the communication path of the CDMA phone maintains the CDMA network.

In particular, in the present invention, the QoS monitor / controller does not send a seamless hand-off recovery command to the controller of the selector just because the QoS of the IP network exceeds only the third threshold. That is, when the QoS of the IP network swings based on the third threshold, that is, the increase and decrease are repeated after the second threshold is exceeded, but not maintained for a certain period after the third threshold is completely exceeded. Similarly, if the IP network is unstable, even if the QoS of the IP network exceeds the threshold, a seamless hand-off recovery command is not sent.

The controller of the selector that has received the seamless hand-off recovery command sends a seamless hand-off recovery trigger / initiation message to the CSM chipset and the MSM chipset. S21).

Accordingly, the CSM chipset and the MSM chipset hand off the CDMA phone to the wireless end of the adaptive gateway in the CDMA network (S22). That is, the CSM chipset and the MSM chipset switch the communication path so that the voice signal of the CDMA phone is received at the wireless end of the adaptive gateway. The packetizer / depacketizer is enabled to transmit an 8kbps CDMA signal received from the CDMA phone to the IP network.

When handoff recovery to the IP network is completed (S23), the controller of the selector forwards an uninterrupted handoff recovery complete message to the QoS monitor / controller. The QoS monitor / controller then drops the path to the CDMA network to which the voice signal of the CDMA phone has been transmitted (S24).

After that, the QoS monitor / controller continues to monitor the QoS of the IP network.

4 is a flowchart illustrating a communication service control procedure according to a second embodiment of the present invention, and relates to an example in which a voice signal of a wireline telephone is serviced through IP, such as Voice over IP (VoIP).

Basically, the landline is registered with the adaptive gateway (S30).

If there is a voice signal transmission request from the registered wireline telephone to the IP network (S31), a wired communication channel is formed (S32).

The wired telephone transmits a 64kbps PCM signal through the formed wired communication channel (S33), and the vocoder of the adaptive controller converts the received 64kbps PCM signal into an 8kbps CDMA signal (S34).

The packetizer / depacketizer converts the 8kbps CDMA signal output from the vocoder into an IP packet according to the transmission standard of the IP network and then transfers it to the IP network (S35 and S36).

The QoS monitor / controller monitors the QoS of the IP network from the time point at which the wired communication channel to the wired telephone is formed (S37).

If the QoS of the IP network is degraded and the QoS continues to decrease even after falling below the first threshold set for determining whether to handoff (S38), the QoS monitor / controller selects a seamless hand-off command. Send to the controller of the controller and the controller of the adaptive controller (S39).

At this time, the communication path of wired telephone maintains IP network. That is, the controller of the adaptive controller opens a new output path to the radio side while maintaining the output path to the existing IP network of the second vocoder.

The controller of the selector delivers a seamless hand-off trigger / initiation message to the CSM chipset and the MSM chipset (S40).

The MSM chipset operates as if the CDMA phone attempts to make a voice call so that the wired telephone is handed off to the CDMA network, and performs call initiation / setup to the CDMA network (S41).

When the call setup of the wireline telephone to the CDMA network is successfully completed (S42), the CSM chipset and the MSM chipset perform a handoff to the CDMA network and handoff the wireline telephone to the CDMA network (S43). That is, the CSM chipset and the MSM chipset switch the communication path so that the voice signal of the wireline telephone is received by the base station of the CDMA network. At this time, the voice signal of the wireline telephone is first converted into an 8kbps CDMA signal.

When the handoff to the landline is completed (S44), the controller of the selector forwards the disconnection handoff complete message to the adaptive controller and the QoS monitor / controller (S45).

The QoS monitor / controller disconnects the communication path to the IP network in response to the disconnection handoff completion message being input (S46). The controller of the adaptive controller disconnects the output path to the IP network side of the second vocoder.

However, even afterwards, the QoS monitor / controller continuously monitors the QoS of the IP network (S47).

However, if the QoS of the IP network is good and the QoS continues to increase even after exceeding the set second threshold for determining whether to handoff (S48), the QoS monitor / controller may perform an uninterrupted handoff recovery (S48). Seamless hand-off recovery) command is sent to the controller of the selector and the controller of the adaptive controller (S49).

At this time, the communication path of the wireline telephone maintains the CDMA network. That is, the controller of the adaptive controller newly opens the output path to the existing IP network side while maintaining the output path to the radio end side after the handoff of the second vocoder.

The QoS monitor / controller enables the packetizer / depacketizer and regenerates the path to the IP network of the wireline telephone (S50). Accordingly, the communication path of the wireline telephone is simultaneously formed with the CDMA network and the IP network.

In particular, in the present invention, the QoS monitor / controller does not send a seamless hand-off recovery command to the controller of the selector and the controller of the adaptive controller just because the QoS of the IP network exceeds only the third threshold. That is, when the QoS of the IP network swings based on the third threshold, that is, the increase and decrease are repeated after the second threshold is exceeded, but not maintained for a certain period after the third threshold is completely exceeded. Similarly, if the IP network is unstable, even if the QoS of the IP network exceeds the threshold, a seamless hand-off recovery command is not sent to the controller of the selector.

The controller of the selector that has received the seamless hand-off recovery command sends a seamless hand-off recovery trigger / initiation message to the CSM chipset and the MSM chipset. S51).

Accordingly, the CSM chipset and the MSM chipset switch the path of the wired telephone to the CDMA network to the IP network (S52), and the MSM chipset releases the call of the wired telephone set (S53).

When handoff recovery to the IP network is completed (S54), the controller of the selector forwards an uninterrupted handoff recovery complete message to the QoS supervisor / controller and the controller of the adaptive controller (S55). The controller of the adaptive controller disconnects the output path to the radio end side of the second vocoder. The QoS monitor / controller then continues to monitor the QoS on the IP network.

According to the present invention described above, by handoff the voice signal of the terminal to the wireless network (particularly CDMA network) according to the QoS (Quality of Service) of the wired network (particularly IP network), the wireless network and the wired network interworking with each other It provides higher quality voice communication service in communication environment.

And while maintaining the advantages of existing VoIP service, it can overcome the limitation of VoIP service.

Those skilled in the art will appreciate that various changes and modifications can be made without departing from the technical spirit of the present invention.

Therefore, the technical scope of the present invention should not be limited to the contents described in the detailed description of the specification but should be defined by the claims.

Claims (22)

In a communication system that interconnects a wired network and a wireless network, Transmitting a voice signal received from a terminal to the wired network; And a second step of switching the communication path of the terminal to the wireless network according to the quality of service (QoS) of the wired network. The method of claim 1, wherein the first step, And a voice signal received from a wired terminal is converted into a signal based on a transmission standard of the wireless network and transmitted to the wired network. The method of claim 1, wherein after the second step, And restoring a communication path of the terminal from the wireless network to the wired network as the service quality of the wired network is restored to a level at which the communication service is possible. In a communication system that interconnects an Internet Protocol (IP) network and a CDMA network, Transmitting a voice signal received from a CDMA phone to the IP network; A second step of monitoring a quality of service of the IP network; And a third step of switching the communication path of the CDMA phone to the CDMA network according to the quality of service (QoS) of the monitored IP network. The method of claim 4, wherein after the third step, And restoring a communication path of the CDMA phone from the CDMA network to the IP network as the quality of service of the IP network is restored to a level capable of communication service. The method of claim 4, wherein the third step, And maintaining the communication path of the CDMA phone to the IP network before completely switching the communication path of the CDMA phone to the CDMA network. In a communication system that interconnects an Internet Protocol (IP) network and a CDMA network, Transmitting a voice signal received from a landline telephone to the IP network; A second step of monitoring a quality of service of the IP network; And a third step of switching the communication path of the wireline telephone to the CDMA network according to the quality of service (QoS) of the monitored IP network. The method of claim 7, wherein the first step, And converting the voice signal received from the wireline telephone into a CDMA signal conforming to the transmission standard of the CDMA network and transmitting the converted voice signal to the IP network. The communication service control method according to claim 8, wherein a 64 kbps PCM signal received from the landline is converted into an 8 kbps CDMA signal. 8. The method of claim 7, wherein after the third step, And converting the voice signal received from the wireline telephone into a CDMA signal conforming to the transmission standard of the CDMA network, and transferring the converted CDMA signal to the CDMA network. 8. The method of claim 7, wherein after the third step, And restoring a communication path of the wireline telephone from the CDMA network to the IP network as the quality of service of the IP network is restored to a level of communication service. 12. The communication service control according to claim 11, wherein the voice signal received from the wireline telephone is converted into a CDMA signal according to a transmission standard of the CDMA network, and the converted CDMA signal is transmitted to the returned IP network. Way. A wireless terminal; Wired terminal; And an adaptive gateway that monitors the service quality of the wired network and switches the communication path of the wireless terminal or the wired terminal according to the quality of service of the wired network. The method of claim 13, wherein the adaptation gateway, A service quality monitor / controller for monitoring a service quality of the wired network and instructing a communication path change according to the service quality of the wired network; And a selector for switching the communication path of the wireless terminal or the wired terminal to a wireless network according to the command of the quality of service monitor / controller. 15. The communication service control system of claim 14, wherein the adaptive gateway further comprises a vocoder for converting a voice signal of the wired terminal into a signal based on a transmission standard of the wireless network. The method of claim 14, wherein the selector, And setting up a call to the wireless network for the wired terminal to switch the communication path of the wired terminal to a wireless network. The method of claim 13, wherein the adaptation gateway, When the service quality of the wired network becomes a level at which communication service is impossible, the communication path of the terminals is switched to the wireless network, And after the communication path is switched to the wireless network, when the service quality of the wireline network returns to a level at which the communication service is available, the communication path of the terminals is restored to the wireless network. In a communication service based on voice communication (VoIP) to the Internet Protocol (IP) network, A CDMA phone; A landline telephone; And an adaptive gateway that monitors the service quality of the IP network and switches the communication path of the CDMA phone or the wired telephone according to the quality of service of the IP network. 19. The system of claim 18, wherein the adaptive gateway is A service quality monitor / controller that monitors the service quality of the IP network and instructs the communication path switching according to the service quality of the IP network; A selector for switching the communication path of the CDMA phone or the wireline telephone to a CDMA network according to the command of the quality of service monitor / controller; And a vocoder for converting a voice signal received from the wireline telephone into a CDMA signal according to a transmission standard of the CDMA network. The method of claim 19, wherein the selector, CSM chipset (Cell Site Modem chipset) and MSM chipset (Mobile System Modem chipset) for converting the communication path of the CDMA phone or wireline telephone to a CDMA network, And a controller for receiving the communication path switching command of the quality of service monitor / controller to control the CSM chipset and the MSM chipset to switch the communication path of the CDMA phone or the wireline telephone to the CDMA network. Control system. 21. The communication service control system according to claim 20, wherein the selector and the quality of service monitor / controller composed of the CSM chipset, the MSM chipset, and the controller are manufactured as one module. The method of claim 20, wherein the MSM chipset, And setting up a call to the CDMA network for the wireline telephone to switch the communication path of the wireline telephone to a CDMA network.