KR100657599B1 - Method for Distributing of Resources on Cable Modem Termination System And Authentication Method of Data Transmission Quantity of Cable Modem Using The Same - Google Patents

Abstract

The present invention relates to the distribution of traffic between a cable modem termination system and each interface when a mixed network of optical and coaxial cables is operated as a data transmission network. (A) Up, down, uplink Monitoring traffic on the port; (b) Analyze the traffic of the upstream port from each of the ports monitored in step (a) to find the overload port of the traffic that exceeds the preset threshold, and if there is an overloaded port, Moving the excess amount to a low load port in which a traffic margin is greater than the excess amount of the overload port, and storing the result of the movement in a DB, and requesting port expansion or cell division if there is no low load port of traffic lower than a reference value; (c) if there is no overload up port or distribution of the up port is completed, analyzing traffic of the down port to find another low load down port and storing the result in the DB; otherwise, requesting port expansion or cell division; (d) When there is no overload down port or analysis of the down port is completed, uplink traffic is analyzed to find another low load uplink port, and the result is stored in the DB.

Internet, cable, modem, port, overload, low load, distributed, pay as you go

Description

Method for Distributing of Resources on Cable Modem Termination System And Authentication Method of Data Transmission Quantity of Cable Modem Using The Same}

1 is a block diagram of a cable modem network according to the present invention.

2 is a flow chart for explaining the present invention.

3 is a flowchart illustrating a port distribution process in the present invention.

4 is a graph illustrating a distributed processing method of an overload port according to the present invention.

5 is a graph for explaining a conventional method for distributed processing of an overloaded port.

Explanation of symbols on the main parts of the drawings

10: internet 11: router

12 switch 13 operation server

14: CMTS 15: ORX

16: OTX 17: combiner

20: ONU 21: Splitter

22: cable modem 23: PC

24: STB 25: TV

The present invention relates to a resource distribution method of a cable modem termination system and a data transmission amount checking method of the cable modem using the same. In particular, when operating a mixed network of optical and coaxial cables as a data transmission network, the traffic between the cable modem termination system and each interface It is to check the variance and the amount of data transmission by cable modem using this method.

In general, a network composed of a mixture of an optical cable and a coaxial cable, that is, a communication network, that is, an optical coaxial hybrid network (HFC; Hybrid Fiber & Coaxial) has been installed and operated as a cable TV network. It is developed to transmit data using frequency band and is operated as a high speed data communication network.

As shown in FIG. 1, the HFC can be described by dividing the TV transmission network and data transmission into a data transmission network for TV signal transmission.

First, the TV transmission network receives a TV program supplied from the program provider 18 and is mixed with the data signal by the combiner 17 and then the optical cable network by the optical transmitter 16 and the optical network unit 20 (ONU). And the coaxial cable network via the ONU 20, the distributor 21, the STB 24, and the like, to the TV 25.

Unlike the TV transmission network configured as described above, the data transmission network includes a router 11 connected to the Internet 10, a switch 12 connected to the router 11, an operation server 14, and the switch. One side is composed of a Cable Modem Termination System (CMTS) 14 connected to 12, and in the case of downlink data transmission (in case of transmitting data in the subscriber direction) by the combiner 17 Mixed with the TV signal, the optical cable network by the OTX (16) and ONU (20), and the coaxial cable network through the ONU (20), the distributor 21 and the cable modem (CM; Cable Modem) 22, etc. Is transmitted to the PC 23, and in the case of uplink data transmission, the CMTS from the PC 23 through the CM 22 and the distributor 21 through the ONU 20 and the ORX (Optical Receiver) 15 14, and is connected to the Internet 10 via the switch 12 and the router 11.

The cable transmission network is originally a network designed mainly for downlink services in order to transmit analog video channels to many users. When the cable transmission network is used as a data network, a frequency band ranging from 54 to 860 MHz can be used as a downlink frequency band. In contrast, the uplink data frequency band is 5 to 42 MHz, and a narrower frequency band is allocated than the downlink frequency band.

In addition, the data transmission service using the cable transmission network as described above provides an uplink speed of about 2.5 Mbps using a frequency of 1.6 MHz bandwidth per channel and a QPSK modulation method, and uses a 6 MHz bandwidth and 64 QAM modulation method per down channel. It provides downlink speed of 27Mbps.

Therefore, since the number of subscribers subscribed to one cell is large, and simultaneous access is required to share an uplink bandwidth of 2.5 Mbps, traffic congestion is inevitable.

In order to suppress such traffic congestion, it is necessary to continuously monitor uplink traffic as well as downlink traffic and manage appropriate traffic.

In order to manage such traffic, conventionally, while monitoring an upstream port of the CMTS, an appropriate amount of traffic is set as a reference value for each port, and when a port exceeding the reference value occurs, the excess traffic of the corresponding port is operated as traffic lower than the reference value. You are using a method to move to a different port.

The conventional upstream port management described above will be described with reference to FIG. 5 again. In the case of port 1 before the port adjustment (see FIG. 5A), the traffic amount B exceeding the reference value has occurred. .

Since the traffic volume on port 1 has exceeded the threshold, data transmission congestion occurs on the cable modems of subscribers using port 1, so the excess traffic (B) on port 1 can be moved to another port. There is a need.

To this end, conventionally, as shown in (B) of FIG. 5, the excess traffic amount (B) is moved by selecting an arbitrary port among other ports (ports 2 to 6 in FIG. 5) that maintain a lower traffic volume than the reference value. give.

However, in the conventional traffic management method as described above, when the excess traffic amount (B) is moved to the third or sixth port, the traffic stably unless a sudden increase in traffic occurs in the cable modem of the subscriber of the corresponding port. Although the transmission can be made, in case of port 2, because the excess traffic amount (B) was exceeded as soon as the threshold was exceeded, traffic management for port 2 must be re-managed, so the data of the cable modem of the subscriber using the port Transmission may be congested.In case of port 5, the baseline is approached at the moment of excess traffic (B) movement. Therefore, if the cable modem using the port increases or the traffic increases, The congestion of the port can occur immediately. There is a possibility soon lead to direct traffic exceeds phenomenon because they maintain the traffic volume.

Therefore, in the conventional traffic management method as shown in FIG. 5, in the process of moving the excess traffic amount from one port to another port, the traffic moves regardless of the remaining amount of traffic with respect to the reference value without considering the traffic state of the spare port. Because of this, there is a problem that traffic management is not smoothly performed.

Accordingly, the present invention has been made in view of the problems of the prior art, and an object thereof is to monitor traffic of each port constituting the CMTS in a data transmission network by a cable modem termination system (CMTS). When traffic exceeds this threshold, it provides a way to distribute the resources of the cable modem end system that optimizes the port management of the cable modem end system by moving the excess traffic on that port to another port that can maintain optimal traffic conditions. There is.

Another object of the present invention is to provide a method for identifying a data transmission amount of a cable modem by using the resource distribution method of the cable modem termination system and a data transmission amount checking method of the cable modem using the same.

In order to achieve the above object, the present invention comprises the steps of: (a) the server connected to the cable modem end system to monitor the traffic of the uplink, downlink, uplink port; (b) Analyze the traffic of the upstream port from each of the ports monitored in step (a) to find the overload port of the traffic exceeding the preset threshold value, and if there is an overloaded port, After moving the excess amount to the low load port with the excess traffic over the excess port, the result of the movement is stored in the DB, and if there is no low load port with a traffic state lower than the reference value, the port expansion or cell division is requested. step; (c) When there is no overload upstream or distribution of the upstream is completed, the traffic of the downlink port is analyzed to find another low load down port, and if found, the found result is stored in the DB. step; (d) if there is no overload down port or analysis of the down port is completed, analyzing uplink traffic to find another low load uplink port, storing the found result in the DB, and requesting an expansion of the port if not. A resource distribution method of a cable modem end system is provided.

The step (a) further comprises the step of obtaining in real time up or down traffic information for each cable modem for each of the down port, the up port of the cable modem termination system, the down port of the cable modem termination system For monitoring of upstream or downstream traffic between multiple cable modems connected to the upstream port and the upstream port, it is preferable to monitor the traffic according to a preset monitoring period for each connection among the respective downstream ports and the connection between the upstream port and the multiple cable modems. Do.

And, in the step (b), if the traffic excess of the overloaded upstream port is greater than the maximum traffic margin among the low load ports, the excess amount is divided into a plurality, and the divided multiple excess traffics are sequentially selected from the low load port of the maximum traffic margin. The method further includes any one step of distributing the moving amount or dividing the excess amount according to the margin amount of the low load port of the spare amount and distributing the excess amount to the low load port.

In addition, the present invention includes the steps of (a) the server accesses the cable modem end system to monitor the traffic of the uplink, downlink, uplink port; (b) Analyze the traffic of the upstream port from each of the ports monitored in step (a) to find the overload port in the traffic state exceeding the preset threshold value. After moving the excess amount to a low load port where the traffic margin for the overload port is greater than that of the overload port, the result of the movement is stored in the DB, and if there is no low load port with a traffic state lower than the threshold value, a port expansion or cell division is requested. Doing; (c) When there is no overload upstream or distribution of the upstream is completed, the traffic of the downlink port is analyzed to find another low load down port, and if found, the found result is stored in the DB. step; (d) if there is no overload down port or the analysis of the down port is completed, analyzing uplink traffic to find another low load uplink port, and if found, storing the found result in the DB; (e) monitoring the traffic of the upstream port and / or the downstream port and confirming the data transmission amount of each cable modem; It also provides.

(Example)

Hereinafter, with reference to the accompanying drawings showing a preferred embodiment of the present invention described above in more detail.

Control process for the CMTS (14) made in the present invention is made by the control of the operation server 13, the CMTS 14 is a down port and up port for data communication with the CM 22, and the Internet ( 10 uplink port for connection.

Accordingly, in the present invention, the uplink (CM-> CMTS direction) and downlink (CMTS-> CM direction) traffic according to data transmission between the CMTS 14 and the CM 22 and the Internet (CMTS <-> Internet) Target traffic.

In the data transmission between the CMTS 14 and the CM 22, since the uplink speed and the downlink speed are different from each other, and the uplink speed is relatively lower than the downlink speed, the number of CMs 22 subscribed to one cell is large. Traffic congestion is more likely to occur.

Therefore, the operation server 13 is connected to the CMTS 14 (S 10) in the state of traffic information between the CM 22 or the Internet 10 for each port (for example, the amount of data transmitted) It is extracted (S 11).

In order to manage traffic for each port, first, uplink traffic between the CMTS 14 and the CM 22 is analyzed (S 12).

In this case, the operation server 13 must first set a reference value for the smooth traffic transmission for each port.

This reference value is set for smooth traffic transmission of each port, and it is preferable that each port is set to a value (eg, 80%) lower than a maximum traffic limit.

On the basis of the reference value set for each port as described above, it is checked whether there is an upstream port exceeding the reference value among the plurality of upstream ports (S 13).

As a result, if there is an upstream port (overloaded upstream port) exceeding the threshold, the traffic volume (overloaded traffic volume) exceeding the threshold of the overloaded upstream port is divided and moved to the port that maintains the lowest traffic state among the upstream ports ( S 132), the result is stored in the DB (S 132).

This process will be described in more detail with reference to FIG. 3. The excess traffic amount (the difference between the current traffic amount and the reference value of the port where the excess traffic amount of the overloaded upstream port maintains the lowest traffic state (lowest traffic up port) is the largest). Greater than or equal to the traffic margin of the port (S 1321), the excess traffic volume of the overloaded upstream port is moved to the lowest traffic upstream port (S 1322).

As shown in FIG. 4, since the traffic of port # 1 has exceeded the threshold as shown in FIG. 4, in order to move the excess traffic A exceeding the threshold to another port, the current traffic is The excess traffic amount A is moved to the port with the smallest amount (port 6 (# 6) in FIG. 4).

However, if the excess traffic of the overloaded upstream port is greater than the free traffic of the lowest traffic port (S 1321), the excess traffic of the overloaded upstream port is divided into a plurality (S 1323), and the divided multiple traffic starts from the lowest traffic port. In order to distribute the traffic to the ports with the most free traffic (S 1324).

However, in addition to the distributed movement method, the excess amount may be divided in a manner of dividing the excess amount in accordance with the margin ratio with respect to the reference value of the low load port, and distributed to the corresponding low load port corresponding to each ratio.

On the other hand, if there is no low load up port (S 131), the operation server 13 requires port expansion or cell division request to the network administrator because the port expansion or cell division is necessary (S 134).

When the traffic analysis or management for the upstream port is completed as described above, the operation server 13 analyzes the downlink traffic (S 14), and maintains more traffic conditions than a predetermined reference value in comparison with the traffic transmission capability of the downlink port. By checking whether there is an overloaded traffic port (overload down port) under an overload state (S15), if there is an overloaded down port, it is checked whether there is a downlink port that maintains downlink traffic lower than a reference value (S151).

If there is a low load down port, in the case of the down port, because of the characteristics of the CMTS 14, the up port movement to the subscriber's CM cannot be instantaneously unlike the up port, and thus, the overload state of the down port and the low load down port The result of the existence is stored in the DB (S 152) to allow port distribution by the administrator.

However, if there is an overload down port but there is no low load down port, the network manager requests the expansion of the down port or requests cell division (S 153).

Then, when there is no overload down port or analysis of the down port is completed (S 15), the traffic for uplink connecting the CMTS 14 and the Internet is analyzed (S 16) to check whether there is an overload (S 17). ).

As a result of checking the overload on the uplink port, if the uplink is overloaded and there is an uplink in another low load state (S 171), the result is stored in the DB (S 172), and the uplink is overloaded and underloaded. If there is no link, the network manager requests an uplink extension (S 153).

When the analysis on the uplink port is completed as described above, the traffic information is returned to the step S 11 of extracting the traffic information for the next period traffic analysis.

In the above process, the traffic for each port should be periodically analyzed with an appropriate period set in advance by the operation server 13 to allow smooth data communication between the CMTS 14 and the CM 22.

On the other hand, by using the resource distribution method of the cable modem end system as described above to measure the amount of data transmission between the CMTS 14 and each CM 22, each CM (22) for a certain period (for example, monthly unit) You can check the data transfer amount for.

That is, the data transmission between the CMTS 14 and each CM 22 is the amount of downlink data transmission between the down port of the CMTS 14 and one CM 22 or between the upstream port of the CMTS 14 and one CM 22. The amount of uplink data transmission can be measured respectively.

The data transmission volume between the CMTS 14 and the CM 22 during the predetermined period measured as described above can be used as billing data when the Internet usage fee is operated in a pay-as-you-go scheme (a system that charges the Internet usage fee in proportion to the data transmission amount). It is.

In addition, when the operation server 13 brings the traffic state data from the CMTS 14, in the past, the data accumulated for each CM 22 was periodically taken for a predetermined time to analyze the traffic state of each port. In the present invention, for each of the downlink port, uplink port, and uplink, the corresponding traffic information for each CM 22 is taken and analyzed.

As described above, if the traffic information for each CM 22 is taken and analyzed for each port, the traffic information for each CM 22 can be analyzed in real time so that the traffic state can always be optimally managed.

In addition, although not described in the above embodiments, if there is a port or CM 22 that requires special attention (for example, heavy traffic congestion), the port or CM may be monitored at shorter intervals than other ports or CMs. Thus, traffic congestion of the corresponding port can be made more intensive, thereby minimizing traffic congestion.

According to the present invention, the data transmission state between the CMTS 14 and the CM 22, that is, when the traffic of the upstream port exceeds the threshold while monitoring the traffic in real time, is distributed to other low load ports as appropriate. In this way, the data transmission state between the CMTS 14 and the CM 22 can be optimally operated.

In addition, the present invention provides the effect that the data transfer amount obtained while monitoring the traffic for each port between the CMTS 14 and the CM 22 can be used as billing data of the Internet pay-as-you-go system.

In the above, the present invention has been illustrated and described with reference to specific preferred embodiments, but the present invention is not limited to the above-described embodiments and the general knowledge in the technical field to which the present invention pertains without departing from the spirit of the present invention. Various changes and modifications will be made by those who possess.

Claims (5)

(a) the server accessing the cable modem end system and monitoring the traffic of the uplink, downlink, and uplink ports; (b) Analyze the traffic of the upstream port from each of the ports monitored in the step (a) to find the overload port in the traffic state exceeding the preset threshold value, and if there is an overloaded port, the reference value among the low load ports in the traffic state lower than the threshold value. After moving the excess amount to the low load port where the traffic margin for the overload port exceeds the reference value of the overload port, the result of the movement is stored in the DB. Requesting division; (c) When there is no overload upstream or distribution of the upstream is completed, the traffic of the downlink port is analyzed to find another low load down port, and if found, the found result is stored in the DB. step; (d) if there is no overload down port or the analysis of the down port is completed, analyzing uplink traffic to find another low load uplink port, and if found, storing the found result in the DB; Resource distribution method of the cable modem end system comprising a. The cable according to claim 1, wherein the step (a) further comprises obtaining uplink or downlink traffic information for each cable modem in real time for each of the down port and the up port of the cable modem termination system. Resource distribution method for modem end systems. 3. The method of claim 2, wherein the monitoring for uplink or downlink traffic between a plurality of cable modems connected to the downlink port and the uplink port of the cable modem end system is performed by connecting each of the downlink port and the uplink port and the connection between the plurality of cable modems. The resource distribution method of a cable modem end system, characterized in that for monitoring traffic according to a preset monitoring period for the. The method of claim 1, wherein the step (b) further comprises dividing the excess amount into a plurality of excess traffics, if the traffic excess of the overloaded upstream port is greater than the maximum traffic margin among the low load ports. Distributing and moving in sequence from the load port, and further comprising any one step selected from the step of dividing the excess amount according to the margin amount of the low load port of the margin amount to distribute to the corresponding low load port Resource distribution method for cable modem end systems. (a) the server accessing the cable modem end system and monitoring the traffic of the uplink, downlink, and uplink ports; (b) Analyze the traffic of the upstream port from each of the ports monitored in the step (a) to find the overload port in the traffic state exceeding the preset threshold value, and if there is an overloaded port, the reference value among the low load ports in the traffic state lower than the threshold value. After moving the excess amount to the low load port where the traffic margin for the overload port exceeds the reference value of the overload port, the result of the movement is stored in the DB. Requesting division; (c) When there is no overload upstream or distribution of the upstream is completed, the traffic of the downlink port is analyzed to find another low load down port, and if found, the found result is stored in the DB. step; (d) if there is no overload down port or the analysis of the down port is completed, analyzing uplink traffic to find another low load uplink port, and if found, storing the found result in the DB; (e) monitoring the traffic of the upstream and / or downstream ports to ascertain the data throughput of each cable modem; Method of confirming the data transmission amount of the cable modem using the resource distribution method of the cable modem end system comprising a.

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