KR20020048249A - Differential service code assignment machine in the voice Internet packet - Google Patents

Abstract

PURPOSE: A differential service code allocation apparatus and a method in an audio Internet packet are provided to offer a differential character to the audio packet needed the minimum transmission delay between end users and the minimum packet loss based on a real time transmission by using the collected network information and the apparatus information, thereby enhancing service quality between the end users. CONSTITUTION: A network load supervisor(100) maintains a network topology and a link state information, supervises the network state, and transmits the necessary information for determining the effective code allocation to an information collector periodically. A device supervisor(110) maintains a device use information, supervises the device use state periodically, and transmits the necessary information for determining the effective code allocation to the information collector periodically. The information collector(150) produces a discrimination value based on the information from the network load supervisor(100) and the device supervisor(110) and then transmits the produced value to a differential service code allocator. An audio packet detector(130) separates the various packets into an audio packet, a multimedia packet, other packets based on protocol header information of the received packet, allocates an MSB code, and transmits the allocated packets to the differential service code allocator. The differential service code allocator(140) allocates the remain LSB code based on the MSB 3bits information of DCSP(DiffServ Code Point) and then allocates the final DSCP.

Description

Differential service code assignment machine in the voice Internet packet

The present invention relates to an apparatus and method for allocating differential service codes in voice Internet packets. In particular, the present invention requires a minimum delay of transmission and minimum packet loss based on real-time transmission using collected network information and device information. By providing differentiation from other packets with respect to the voice packet to improve the quality of service between end users.

Generally, in the traditional network, the transmitted packets are processed the same without any special processing for the application service. The data processing process could not meet the service requirements between end users.

In other words, packets flowing into the intermediate nodes connecting the end user are retransmitted after a certain time elapses or abandon transmission when the data flow on the network increases.

This results in the difficulty of the service itself in the case of real-time voice call, and also satisfies users because some operating systems provide services to satisfy the requirements of multimedia and real-time applications, but they cannot adjust the data flow on the network. It is difficult to provide a level of service.

As described above, a technology for controlling the flow of data by referring to the size and transmission rate of data to be transmitted between end users in consideration of application requirements is used.

In a network, data flow on the network can be controlled according to requirements such as packet transmission rate and packet arrival time required by the application. In this way, guaranteeing the quality of service between end users is called network quality of service (QoS). .

In order to guarantee the network QoS described above, because the ToS (Type of Service) region exists in the existing Internet protocol header information, the quality of service between end users cannot be guaranteed in the current Internet network.

On the other hand, there is a differential service (DiffServ) that guarantees the level of service through network resource reservation. In the differential service (DiffServ), Best Effort, Expedited Forwarding is used by using 6 bits among 8 bits of the ToS area of the Internet protocol. Allocate differential service code points (DiffServ CodePoints (DSCP)) that provide (EF) and Assured Forwarding (AF) services.

Packets entering the first network are assigned different service code points and are serviced in the network according to their values, but no clear allocation method has yet been proposed.

The present invention is to solve such a conventional problem, an object of the present invention, based on the real-time transmission using the collected network information and device information requires a minimum delay between the end user and packet loss. The present invention provides an apparatus and method for allocating a service code differentially in a voice Internet packet that can improve service quality between end users by providing a differentiation from other packets for the voice packet.

1 is a system diagram for allocating a differential service code in accordance with the present invention.

2 is a flowchart illustrating a determination value determination process according to network state information and device information collection according to the present invention.

3 is a flowchart illustrating a process of detecting a voice packet and assigning a most significant bit (MSB) code according to the present invention.

4 is a flowchart illustrating a least significant bit (LSB) code allocation process according to the present invention.

<Description of the reference numerals for the main parts of the drawings>

100: network load monitor 110: device monitor

130: voice packet detector 140: differential service code allocator

150: information collector

In the present invention for achieving the above object, the optimal code allocation method in the differential service (DiffServ) to improve the service quality between end users maintains the network topology, link state information and device state information, and monitors the network state. A network load monitor that periodically updates network load information, a device monitor that periodically monitors the device status to update the device usage status, and allocates an initial code by separating voice packets, multimedia packets, and other packets from the received packets. And a differential service code allocator for allocating a final code to a packet transmitted by the voice packet detector according to a determination value for determining a code notified by the network load monitor and the device monitor. .

In addition, the differential service code allocation method for improving the quality of service between end users to achieve the above object is divided into two parts of 6-bit information used in the differential service by three bits each of the most significant bit (MSB) in the first voice packet detector. : The most significant bit (MSB) allocating step of allocating most significant bits first, and the least significant bit (LSB) allocating the remaining least significant bit (LSB) based on information notified by the network load monitor and the device monitor. Characterized in divided into stages.

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

1 is a block diagram of an optimal code allocation system in a differential service (DiffServ) to ensure the service quality between end users according to the present invention.

That is, as shown here, the network load monitor 100 maintains the network topology and link state information and periodically monitors the network state to periodically send information necessary to determine an efficient code allocation to the information collector, and the use of the device. In the device monitor 110 and the network load monitor 100 and the device monitor 110, which maintains the degree information and periodically monitors the use status of the device and periodically sends information necessary for determining an efficient code allocation to the information collector. The information collector 150 generates a judgment value based on the sent information and sends the information collector 150 to the differential service code allocator, and divides various types of packets into voice packets, multimedia packets, and other packets based on the header information of each received protocol. The first most significant bit (MSB) code The voice packet detector 130 sent to the service code allocator, the differential service code point (DSCP) most significant bit (MSB) 3-bit information of the packet sent from the voice packet detector 130, and the information collected by the information collector 150. It consists of a differential service code allocator 140 that allocates the remaining least significant bit (LSB) code based on the value to assign the final code point (DSCP).

Referring to the accompanying drawings, the operation of the present invention configured as described above is as follows.

First, FIG. 2 is based on information that has been informed by the network load monitor 100 and the device monitor 110 in an optimal code allocation system in a differential service (DiffServ) to ensure service quality between end users according to the present invention. As a flowchart illustrating a process of determining a determination value, which is a reference for code allocation, in the differential service code allocator 140, the process performed by the information collector 150 in FIG. 1 is described. Here, the determination value is a value that is a reference for determination of code assignment by the differential service code allocator 140 and is based on the information collected by the network load monitor 100 and the device monitor 110 in the information collector 150. The limit value is the maximum value that the device can accommodate the loss and processing delay of the packet in the range that satisfies the quality of service between end users, and the default value is the most device that does not lose the packet and induces the minimum delay. Indicates a value capable of maintaining a stable state.

First, if it is determined that the state is stable based on the collected information, and if the network state is determined to be stable, the determination value for the code assignment is determined as a threshold value indicating the maximum value that the device can accept (steps S1-S3). .

However, if it is determined in step S2 that the network state is unstable, the device information is collected again (step S4), and if the usage amount exceeds the standard amount, the determination value for the code allocation is determined by the device quality of service. It is determined as the default value that can be guaranteed to the maximum (steps S5, S6).

As a result of the determination in step S5, when the device usage does not exceed the reference amount, the determination value for the code assignment is determined as a threshold that can satisfy the service quality between end users.

Figure 3 detects the voice packet among the various packets received by the voice packet detector 130 of the optimal code allocation system in the differential service to ensure the quality of service between end users according to the present invention and the first most significant bit (MSB) code In order to clarify the process of allocating the present invention, a process performed by the voice packet detector 130 is illustrated in FIG. 1.

First, if the data area of the Internet protocol packet is User Datagram Protocol (UDP) by determining whether the protocol is UDP based on the result of collecting the Internet protocol header information, the user datagram protocol header information is collected. If not = UDP, the first most significant bit (MSB) code is assigned to 000 (steps S11-S14).

In addition, when the destination port number is a real time transport protocol (RTP), real time transport protocol header information is collected (steps S15 and S16).

If the load type is negative, the first most significant bit (MSB) code is assigned to 101 (steps S17 and S18).

As a result of the determination in step S15, if the destination port number is not a real time transport protocol (RTP), it is determined whether the destination port number is multimedia, and if not, the first most significant bit (MSB) code is 001. If it is correct, the first most significant bit (MSB) code is assigned to 010 (S19-S21).

On the other hand, when the determination result of step S17, the payload type (Payload Type) is not negative

If it is determined that the load type is audio, the first most significant bit (MSB) code is assigned to 011 (steps S22 and S23). If the load type is not audio, the first most significant bit (MSB) code is allocated to 110 (step S24).

4 is a differential service code point of a packet transmitted from a voice packet detector 130 in a differential service code allocator 140 of an optimal code allocation system in DiffServ for guaranteeing service quality between end users according to the present invention. CodePoint: This is a flowchart for describing a process of allocating a least significant bit (LSB) code of a DSCP) and is for explaining a process performed by the differential service code allocator 140 of FIG. 1.

That is, the determination value is collected from the information collector 105 to collect the most significant bit (MSB) code information of the differential service code point (DSCP) of the packet received from the voice packet detector 130 (steps S31 and S32).

If it is determined that the MSB code = 000 is "Yes", if the most significant bit (MSB) code value is 000, the least significant bit (LSB) code is allocated to 000 (steps S33 and S34).

Here, 000000, which is the sum of the most significant bit (MSB) code and the least significant bit (LSB) code, represents the lowest level of the service level, and allocates all services that do not require real time transmission to this level.

If the most significant bit (MSB) code value is not 000 in step S33, it is determined whether MSB = 101 (step S35). If the most significant bit (MSB) code value is 101, if the device usage is less than the determined value, code 110 is allocated. If the device usage is greater than the determined value (steps S37 and S38), the device allocates 010 (step S41).

Here, 000101, which is the sum of the most significant bit (MSB) code and the least significant bit (LSB) code, represents the highest level of the service level, and real-time transmission is required to allocate a real-time voice service sensitive to delay and loss to this level.

On the other hand, in step S36 collects the size information of the received packet, and improves the quality of service by dividing the service level grade provided by the differential service by the size unit of the packet.

If it is determined that the collected packet size is MTU / 3, and "Yes", the code is allocated to 010 when the device usage is less than the determined value (steps S39-S41), and the code is 100 when the device usage is larger than the determined value. (S42).

In this case, the MTU represents a maximum transmission unit.

On the other hand, if the size <MTU / 2/3 in step S39 again determines whether the size <MTU * 2/3 If "Yes" if the device usage is less than the determined value, the code is assigned to 100 and if the code is 110 Assign (steps S43-S45).

In the step S43, if the size> MTU * 2/3, if the device usage is less than the determined value, the code is allocated to 110. If the device usage is greater than the determined value, the code is allocated to 000000 (steps S46 and S47).

That is, in each case, an emphasis may be placed on maintaining service quality between end users by allocating a least significant bit (LSB) code that provides a lower service level when the device usage exceeds a determined value.

The present invention as described above has the effect of ensuring the service quality maintenance between end users by detecting the real-time voice packet as the priority processing to ensure the satisfactory quality of the real-time voice service.

That is, the code point (DSCP) of the differential service proposed in the present invention is divided according to the characteristics of the data to be serviced and allocated in consideration of the network state and the device usage situation, thereby reducing the waiting time in the device and processing the priority. The advantage is that it becomes possible and prevents the loss of quality against loss.

Claims (6)

In code point (DSCP) allocation of differential services, A network load monitor that maintains network topology and link state information, periodically monitors network status, and sends information to the information collector to determine efficient code allocation; A device monitor that maintains device usage information and periodically monitors the device usage and sends information to the information collector to determine efficient code assignments; An information collector which periodically generates and maintains a determination value for code allocation based on the information sent from the network load monitor and the device monitor, and sends the same to a differential service code allocator; A voice packet detector for dividing various types of packets into voice packets, multimedia packets, and other packets based on protocol-specific header information of the received packets and assigning an initial most significant bit (MSB) code; Based on the differential service code point (DSCP) most significant bit (MSB) 3-bit information of the packet sent from the voice packet detector and the determination value informed by the information collector, the remaining least significant bit (LSB) code is allocated to the final code point (DSCP). And a differential service code allocator for allocating a). In code point (DSCP) allocation of differential services, Allocating the most significant bit (MSB) 3-bit code according to the protocol of the packet, And assigning a least significant 3 bit code according to network conditions and usage of the device. 3. The method of claim 2, wherein the most significant bit (MSB) 3-bit allocation is A first step of allocating a real-time voice packet to a code guaranteeing the highest quality of service, A second step of allocating an audio packet to a code that guarantees a next quality of service; A third step of allocating the video packet to a code that guarantees the next quality of service, A fourth step of allocating a packet for a multimedia conference to a code that guarantees the next quality of service; A fifth step of allocating other user datagram (UDP) packets to codes for guaranteeing the quality of service of the next step, And a sixth step of allocating the remaining packets to codes for guaranteeing the lowest quality of service. 3. The method of claim 2, wherein the least significant bit (LSB) 3-bit allocation is: A first step of separating a packet according to a code assigned to a most significant bit (MSB), A second step of separating the packet according to the size of the packet, And a third step of adjusting the service quality maintenance level between end users according to the usage of the device and the determined value. 5. The method of claim 1 or 4, wherein the decision value is assigned to a threshold value and a default value based on network state information and device information when the determination value is determined. In voice packet detection among differential service code assignment methods in voice internet packets, Distinguishing a User Datagram Protocol (UDP) packet from other packets based on header information of an Internet Protocol (IP) packet, Distinguishing real-time transport protocol (RTP) packets from other packets based on user datagram protocol (UDP) header information; And a method of allocating voice packets to audio packets based on real-time transport protocol (RTP) header information.