KR100725117B1 - A Communication method in VoIP network - Google Patents

Abstract

 The present invention relates to a communication method in a VoIP network, and operates as a Best Effort (BE) channel when a subscriber's information transmission bandwidth is greater than or equal to a CIR value, and the subscriber's information transmission bandwidth is a minimum speed guarantee value. If it is less than the minimum speed guarantee channel, the minimum speed guarantee channel, the minimum speed guarantee channel is activated when the call is set up for the call, the minimum speed guarantee channel is released when the call is released to terminate the call, In this case, the lowest speed guarantee channel is characterized by first processing a voice packet and a signaling message, so that even when the number of simultaneous users is large, it is possible to prevent a decrease in information transmission speed of all concurrent users and to prevent a decrease in voice quality. There is an advantage to that.

VoIP, CIR, HFC, RTP Packet, CMTS

Description

A communication method in VoIP network

1 is a block diagram of a communication system in a VoIP network according to an embodiment of the present invention

2 is a diagram schematically illustrating a communication method in a VoIP network according to the present invention performed on the communication system.

3 is a flowchart illustrating a communication method in a VoIP network according to the present invention performed on the communication system.

<Description of Symbols for Main Parts of Drawings>

100: communication system 105: first VoIP terminal

110: second VoIP terminal 115: VoIP server

120: IP network 125: HFC network

130: CMTS

The present invention relates to a communication method in a Voice over Internet Protocol (VoIP) network, and more particularly, to a subscriber using the VoIP network, to allocate a constant information transmission bandwidth and to improve voice quality. It is about.

 Quality of service (QoS) technology, developed for IP networks, classifies packets by application or by subscriber to vary the quality of service according to a given characteristic. That is, it can be classified by subscriber to provide a differentiated service on the network, and can be classified by application to provide a differentiated service on the network. Such service differentiation technology in the network is widely used.

Packet classification for QoS uses first the source or destination address of the IP header, which is the network layer, or second, the port number of the User Datagram Protocol (UDP) or TCP, which is the data of the transport layer that carries the IP packet. do.

For example, if the source address is '1.0.0.0/24', the highest level service may be provided. If the TCP port number of the transport layer is '23', the highest level service may be provided.

On the other hand, as the demand for transmission of data that requires real-time transmission of video data and audio data through the Internet becomes stronger, a protocol for meeting the demand is provided by the Internet Engineering Task Force (IETF), an Internet standardization organization. A protocol (hereinafter referred to as RTP) has been defined.

The real-time transport protocol (RTP) is the upper layer of the Internet protocol (IP) at the network layer and UDP at the transport layer, and is the next generation of the Internet, which transmits real-time information such as interactive audio, video, and simulation data. This is a protocol for providing end-to-end transport service function required by an application program.

In particular, VoIP, which is one of the most widely used applications on the Internet, delivers voice data using RTP packets, and VoIP is recognized as an important QoS object in a network.

However, in case of transmitting information to a plurality of subscribers in the VoIP network by applying a conventional QoS technology, a scheme in which a plurality of subscribers share the entire bandwidth by using a Best Effort (BE) channel is shared. When there are many simultaneous access subscribers, there is a problem that the information transmission speed is lowered to all concurrent access subscribers.

In addition, since the priority processing technique for the various packets transmitted through the best channel (BE) is not applied, there is a problem in that voice quality is degraded.

Accordingly, the present invention has been made to solve the above-described problem, and an object of the present invention is to prevent a decrease in information transmission speed of all simultaneous users even when the number of simultaneous users is large, and also to prevent a decrease in voice quality. To provide.

The communication method in the VoIP network according to the present invention for achieving the above object is, if the information transmission bandwidth of the lowest rate guaranteed (CIR) channel subscriber is more than the minimum rate guaranteed (CIR) value, the call path of the subscriber is the best ( BE) channel, and if the CIR channel subscriber information transmission bandwidth is less than the minimum speed guarantee value, the subscriber's call path is characterized by operating as a CIR channel.

Here, the lowest rate guaranteed (CIR) channel is characterized by first processing the voice packet and the signaling message.

The method for processing the voice packet and the signaling message may include: classifying the voice packet and the signaling message by identifying an IP address or a port number included in the voice packet and the signaling message; And processing the classified voice packet and signaling message first.

In addition, the lowest speed guarantee (CIR) channel, the minimum speed guarantee (CIR) channel is activated when the call is set up for the call, the minimum speed guarantee (CIR) channel is released when the call is terminated for the call termination It is characterized by.

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

Example

1 is a block diagram of a communication system in a VoIP network according to an embodiment of the present invention.

In the present embodiment, a plurality of subscriber VoIP terminals are represented by the first and second VoIP terminals for convenience of description.

First, as shown in Figure 1, the communication system 100 in the VoIP network according to an embodiment of the present invention is connected to the first and second subscriber communication terminal (not shown), respectively, performs a gateway function (gateway) VoIP server performing overall control of a call such as controlling a call to open a call path between the first and second VoIP terminals 105 and 110 and the first and second VoIP terminals 105 and 110 An IP (Internet Protocol) network 120 connected to the VoIP server 115 to enable communication between the first and second VoIP terminals 105 and 110, and the first and second VoIP terminals. A hybrid-fiber coaxial (HFC) network 125 connected to the first and second VoIP terminals 105 and 110 so as to be connected to the first and second VoIP terminals 105 and 110, the IP network 120 and the HFC network ( 125) includes a Cable Modem Termination System (CMTS) for interworking.

Referring to Figure 2 schematically illustrates a communication method in the VoIP network according to the present invention on the communication system 100, first when the first VoIP terminal 105 wants to call the second VoIP terminal 110 The first VoIP terminal 105 requests a call setup for the call with the second VoIP terminal 110 toward the VoIP server 115 (1).

Next, the first and second VoIP terminals 105 and 110 face the CMTS 130, and the communication path between the first and second VoIP terminals 105 and 110 is guaranteed at the lowest speed (CIR: Committed Information Rate). Request to be set to channel (②, ② '). Here, the 'lowest rate guarantee (CIR)' is determined by the system operator and refers to the guaranteed minimum data transmission rate for each subscriber.

Next, the CMTS 130, which is requested to set the lowest speed guaranteed (CIR) channel, sets the call path between the first and second VoIP terminals 105 and 110 as the lowest speed guaranteed (CIR) channel. After determining whether or not a response is made, the first and second VoIP terminals 105 and 110 perform the response (②, ② '). This will be described later in detail.

Then, the first and second VoIP terminals 105 and 110 communicate with each other through the established communication path (③).

Then, if the first and / or second VoIP terminals 105, 110 want to release the call, the first and / or second VoIP terminals 105, 110 terminate the call towards the VoIP server 115. (④).

Finally, the first and second VoIP terminals 105 and 110 request the release of the lowest rate guaranteed (CIR) channel toward the CMTS 130 and then receive a response thereto, thereby receiving the first and second VoIP terminals ( The communication between 105 and 110 ends.

3 is a flowchart illustrating a communication method in the VoIP network according to the present invention on the communication system 100.

Referring to FIG. 3, the communication method in the VoIP network according to the present invention will be described in detail. First, when the first VoIP terminal 105 wants to make a call with the second VoIP terminal 110, the first VoIP terminal 105 A call setup request is made to the VoIP server 115 (S305).

Next, the VoIP server 115 requests the call establishment with the first VoIP terminal 105 toward the second VoIP terminal 110 (S310).

Next, the second VoIP terminal 110 responds to the call establishment request of the VoIP server 115 (S315), and the VoIP server 115 is directed toward the first VoIP terminal 105, and the first VoIP terminal 105 In response to the call setup request of 105 (S320).

Next, the first and second VoIP terminals 105 and 110 face the CMTS 130 so that the communication path between the first and second VoIP terminals 105 and 110 is set as the lowest speed guaranteed (CIR) channel. Request (S325, S325 ').

At this time, the CMTS 130 determines whether to set the call path between the first and second VoIP terminals 105 and 110 as the lowest speed guaranteed (CIR) channel in consideration of other simultaneous access users.

For example, if the total information transmission bandwidth is 100 Mbps and the CIR value is 10 Mbps, if there are two subscribers of the CIR channel and three BE channel subscribers among the concurrent users, In addition, the information transmission bandwidth per subscriber is 100 Mbps / 5 = 20 Mbps, which is greater than the minimum CIR value of 10 Mbps, so that all five concurrent users operate as the best (BE) channel of 20 Mbps. Accordingly, the CMTS 130 does not operate the call path between the first and second VoIP terminals 105 and 110 through the CIR channel (the first and / or second VoIP terminals 105 and 110). ) Is assumed to be the lowest rate guaranteed (CIR) channel subscriber.

However, if, for example, the total information transmission bandwidth is 100 Mbps and the minimum speed guarantee (CIR) value is 10 Mbps, two concurrent subscribers have two CIR channel subscribers and 10 best channel subscribers. If so, the information transmission bandwidth per subscriber is 100 Mbps / 12 = 8.33 Mbps, which is less than the minimum speed guarantee (CIR) value of 10 Mbps, in which case the lowest rate guarantee (CIR) channel subscriber is the lowest rate guaranteed (CIR) channel. (10 Mbps), and other best channel subscribers share the rest of the information transmission bandwidth {(100 Mbps-10 Mbps * 2) / 10 = 8 Mbps}. Accordingly, the CMTS 130 operates the call path between the first and second VoIP terminals 105 and 110 through the CIR channel (the first and / or second VoIP terminals 105 and 110). ) Is assumed to be the lowest rate guaranteed (CIR) channel subscriber.

In this embodiment, it is assumed that the call path between the first and second VoIP terminals 105 and 110 operates as the lowest speed guaranteed (CIR) channel.

Next, the CMTS 130 responds to the first and second VoIP terminals 105 and 110 in response to a request for setting a minimum speed guarantee (CIR) channel of the first and second VoIP terminals 105 and 110. (S330, S330 ').

Next, the first and second VoIP terminals 105 and 110 communicate with each other through the CIR channel (S335).

In this case, it is preferable to classify the packet transmitted through the CIR channel and to first process a voice packet (RTP packet) and a signaling message, thereby preventing deterioration of voice quality.

That is, it uses (identifies) the IP address of the source or destination of the IP header, which is the network layer, or uses the port number of UDP or TCP, which is data of the transport layer that carries IP packets (identifies). After classifying the voice packet (RTP packet) and the signaling message, only the voice packet (RTP packet) and the signaling message may be processed and transmitted first.

Then, if the first VoIP terminal 105 wants to terminate the call, the first VoIP terminal 105 requests the VoIP server 115 to terminate the call (S340).

Next, the VoIP server 115 requests the call termination with the first VoIP terminal 105 toward the second VoIP terminal 110 (S345).

Then, the second VoIP terminal 110 responds to the call termination request of the VoIP server 115 (S350), the VoIP server 115 toward the first VoIP terminal 105, the first VoIP terminal 105 Respond to the call termination request of 105 (S355).

Finally, the first and second VoIP terminals 105 and 110 request the release of the lowest rate guaranteed (CIR) channel established between the first and second VoIP terminals 105 and 110 toward the CMTS 130. At step S360 and S360 ', the CMTS 130 responds thereto (S365 and S365') to terminate communication between the first and second VoIP terminals 105 and 110.

Meanwhile, in the above-described embodiment, the dynamic operation method of operating the lowest speed guarantee (CIR) channel only when a call is applied, but in some cases, the lowest rate guarantee (CIR) channel is operated until the VoIP terminal is turned off. You can also apply static operation.

In this way, when the number of concurrent users is large, by allocating the lowest rate guaranteed (CIR) channel to some subscribers, it is possible to prevent the problem of a decrease in the information transmission speed of all concurrent users. By performing packet priority processing in conjunction, it is possible to maintain voice quality even at the highest times in a shared media HFC network.

The present invention is not limited to the above-described embodiments, but can be variously modified and changed by those skilled in the art, which should be regarded as included in the spirit and scope of the present invention as defined in the appended claims. something to do.

 As described in detail above, according to the communication method in the VoIP network according to the present invention, even when the number of simultaneous users is large, there is an advantage in that the information transmission speed of all simultaneous users can be prevented from being lowered and the voice quality can be prevented from being lowered. have.

Claims (4)

If the CIR channel subscriber's information transmission bandwidth is greater than or equal to the CIR value, the subscriber's call path operates as the best channel and the CIR channel subscriber's information transmission. If the bandwidth is less than the minimum speed guarantee value, the subscriber's call path operates as the lowest rate guaranteed (CIR) channel The lowest speed guarantee (CIR) channel, First, process voice packets and signaling messages, The method for processing the voice packet and the signaling message first, Classifying the voice packet and the signaling message by identifying an IP address or a port number included in the voice packet and the signaling message; And Processing the classified voice packets and signaling messages first; and The lowest speed guarantee (CIR) channel, And the lowest speed guarantee (CIR) channel is activated when a call is set up for a call, and the minimum speed guarantee (CIR) channel is released when a call is terminated. delete delete delete

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