KR101543772B1 - Network access device and packet transmission method in the device - Google Patents

Abstract

A network access device is disclosed that is implemented in an Internet Protocol (IP) network and connects external networks to an IP network. The network access device includes a packet receiver for receiving packets transmitted from an external network, analyzing application layer information of the received packet to determine the type of the packet, and transmitting the destination address of the received packet to a predetermined destination address And a packet transmission unit for transmitting the packet whose destination address is modified to a destination. That is, a packet entering an IP network from an external network such as a sensor network can be automatically transmitted to one or a plurality of destinations designated by an operator, thereby enabling quick sharing of information.

Description

[0001] The present invention relates to a network access device and a packet transmission method performed in the device,

And more particularly, to a network access device that receives a packet that enters an IP (Internet Protocol) network from an external network and transmits the packet to a destination.

This study is derived from the research carried out as part of the IT original technology development project of the Ministry of Knowledge Economy. [Assignment Number: 2006-S-064-02, Title: BcN Network Engineering Technology Research]

In a whole network in which heterogeneous networks are mixed, for example, a plurality of sensor networks and an entire network composed of IP networks, a network access device implemented in an IP network transmits all packets transmitted from sensor networks to an IP address And to deliver it to a predetermined destination. For the purpose of network operation and management, the network access device also measures the packet flow and controls excessive traffic flow to a specific destination. To perform these roles, the network access device uses a method of analyzing the IP header information of the packet.

In recent years, there is a need for detailed analysis of application layer information for various traffic control and management in a network. Therefore, although many network processors and system chips are being developed to provide such functions, specific methods and application models that can use them are not activated. However, as the social environment evolves and evolves into a ubiquitous environment, the network area including the sensor network expands and the amount of information flowing into the network increases exponentially. Among the packets generated from the devices that are not normally managed are unnecessary and meaningless This results in disruption of the entire network or waste of resources. This can not be prevented only by analyzing the IP header information.

It is an object of the present invention to enable rapid sharing of information by allowing an application layer to be transmitted to one or more destinations specified by an operator by analyzing an application layer of a packet entering an IP network from an external network such as a sensor network.

The present invention also aims at enhancing the stability of a network by previously filtering garbage packets or abnormal packets generated from an abnormal sensor device or the like through application layer analysis of packets.

In addition, it aims at ensuring efficient operation of the network by filtering packets that may cause unnecessary traffic increase.

According to an aspect of the present invention, there is provided a network access apparatus, which is implemented in an IP network and connects external networks to an IP network, includes a packet receiver for receiving packets transmitted from an external network, A packet processing unit for identifying the type of the received packet, modifying the destination address of the received packet to a destination address preset for the detected type, and a packet transmitting unit for transmitting the destination address-modified packet to the destination.

In order to accomplish the above-mentioned object, a packet transmission method implemented in a network access device that is implemented in an IP network and connects external networks to an IP network includes analyzing application layer information of a packet received from an external network, Modifying the destination address of the packet to a predetermined destination address with respect to the type of the detected packet, and outputting the output packet to the destination.

According to the present invention, a packet entering an IP network from an external network, such as a sensor network, can be automatically transmitted to one or more destinations specified by an operator, thereby enabling quick sharing of information.

In addition, the packet can be automatically transmitted to one or more destinations designated by the operator, thereby preventing concentration of the packets in a single server, and distributing information to the server for backup when a problem occurs in one server.

In addition, the network access device automatically transfers the packet to a plurality of destinations, thereby remarkably improving the information utilization structure in which the destination delivered to one destination is redistributed as needed.

Also, by analyzing the packet application layer information, it is possible to enhance the stability of the network by pre-filtering the garbage packet or the abnormal type packet generated from the abnormal sensor.

In addition, filtering is performed on packets that do not satisfy the transmission time interval specified by the operator and can cause unnecessary traffic increase, thereby enabling efficient operation of the network.

In addition, by performing the packet distribution function in the network access device, the functions in the sensor network can be reduced and the necessary functions can be easily added to the network access device, so that the network access device can be flexibly operated in the utilization method.

BRIEF DESCRIPTION OF THE DRAWINGS The foregoing and further aspects of the present invention will become more apparent from the following detailed description of preferred embodiments with reference to the accompanying drawings. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings.

1 is a diagram illustrating an entire network including a broadband IP network and sensor networks according to an embodiment of the present invention.

The broadband IP network 170 is a network covering both IPv4 and IPv6 address systems. The plurality of scattered sensor networks 100, 110, and 120 are connected through the network access devices 180 and 190 of the IP network. The network access device may be a router or a switch. The sensor information collected at the sensor networks 100, 110 and 120 is transmitted to the network access devices 180 and 190 of the IP network 170 and the network access devices 180 and 190 transmit the sensor information And delivers the packet to the network entities (130, 140, 150, 160). Here, each of the organs 130, 140, 150, and 160 processes and collects the sensor information collected as a whole according to the nature of the sensor information, and provides useful information or provides it to the operator.

2 is a protocol stack structure diagram of a packet that has been transmitted from the sensor network to the IP network.

The protocol stack of the packet includes a physical layer 200, a MAC layer 210, a network layer 220, a transport layer 230, and an application layer 240 including actual sensor information. A network access device according to an aspect of the present invention analyzes sensor information included in an application layer 240 of a packet and handles packets according to characteristics of the information.

3 is a diagram illustrating an application layer payload configuration of a packet configured with sensor information according to an embodiment of the present invention.

FIG. 3 is a detailed description of the sensor information 370 constituting the application layer 240 of the packet. Basically, the sensor information 370 is composed of contents to be included in the sensor information. The sensor ID 310 is a unique identifier for identifying the sensor in the corresponding sensor network. The IP address 320 is an ID address allocated to the sensor. The location information 330 indicates geographical information on which the corresponding sensor is located. The sensing data major classification type (340) is information for dividing sensor information into a large range, and the sensing data sub-classification type (350) is information for finely distinguishing sensor information classified into large categories. In FIG. 3, the type of the sensor information is exemplified as a two-stage classification of an upper (main category) and a lower (lower category), but a single classification is also possible. And the sensing data means actual information generated from the sensor.

4 is a block diagram of a network access device in accordance with an embodiment of the present invention.

The network access device 180 includes a packet receiving unit 400, a packet processing unit 410, and a packet transmitting unit 420. The packet receiving unit 400 receives a packet transmitted from the external network to the IP network and transmits the packet to the packet processing unit 410. In one embodiment, the external network is a sensor network. In this case, the packet is a packet including sensor information. The packet processor 410 analyzes the application layer of the packet, modifies the destination address of the packet according to the analysis result, and transfers the packet to the packet transmitter 420 or discards the packet. The packet processing unit 410 also performs a packet filtering function to prevent repeated transmission of unnecessary packets. In order to perform these functions, the packet processing unit 410 refers to various table information. In addition, the packet processing unit 410 can set or change the table information according to an operator request through the external management system 430. Meanwhile, the packet transmission unit 420 transmits the packet transmitted from the packet processing unit 410 to the designated destination.

FIG. 5 is an exemplary table for classifying sensing data types for identifying sensor information.

The type classification table 500 provides classification information on a sensing data type for distinguishing sensor information. As shown, the sensing data types can be classified into a large classification 510 and a small classification 520 subdivided in a large classification. In this case, it is desirable to standardize the classification system in order to maintain the consistency of the sensor information between the institutions processing the sensor information and to improve the efficiency of the sensor information processing.

FIG. 6 is an exemplary table for managing destination address information to be delivered according to a major classification type of sensing data and transmission time interval information to which the packet is transmitted.

The destination address information 620 of an organization to which a packet is to be delivered and the transmission time interval information 630 to which a packet is delivered are managed through the table 600 of FIG. 6 for each sensing data major classification type 610. This table value can be set or changed according to the operator's request through the external management system in the initial setting or operating state. One or more destination address information 620 can be set for each sensing data major classification type 610 and it is also possible to set transmission time interval information 630 differently corresponding to each destination address information 620 .

FIG. 7 is an exemplary table for managing destination address information to be delivered according to a subtype type of sensing data and transmission time interval information to which the packet is delivered.

The table 700 of FIG. 7 is a table further divided into sub-steps according to the sensing data major classification type as compared with the table 600 of FIG. 6, and the sensing data sub-classification types 720 are classified by the sensing data major classification types 710 . This table value can be set or changed according to the operator's request through the external management system in the initial setting or operating state. One or more destination address information 730 can be set for each sub-category, and it is also possible to set transmission time interval information 740 differently corresponding to each destination address information 730.

8 is an illustration of a packet transmission filtering table for suppressing unnecessary repetitive transmission of a packet.

The packet transmission filtering table 800 includes transmission time information 810 for the sensing data major classification type 810, the sensing data small classification type 820, the sensor ID 830, the IP address 840 for the sensor, (860). In one embodiment, the transmission time information 860 is updated in the overwrite format when a packet is normally transmitted to a given destination address.

FIG. 9 is a flowchart for processing a packet according to a sensing data major classification type as an initial process in the overall packet processing performed in the packet processing unit of FIG. 4 according to an embodiment of the present invention.

The packet processing unit 410 receives the packet through the packet receiving unit 400 in the reception waiting state for receiving the packet (step 900) (step 902). The packet processor 410 analyzes the application layer of the received packet and reads the sensing data major classification type information in the payload configuration of the application layer of the packet as shown in FIG. 3 (step 904). Then, a normal verification process is performed on the sensing data major classification type information (step 906). In one embodiment, the packet processor 410 may perform a normal verification process on the sensing data major classification type information by referring to the table 600. [ That is, it is checked whether the sensing data major classification type information is registered in the table 600. If it is determined in step 906 that the packet is abnormal, the packet processor 410 discards the packet, switches to the reception standby state, and terminates (step 908) (step 910). If it is a default value corresponding to a predefined by-pass in step 906, the packet processing unit 410 transfers the packet to the packet transmitting unit 420 as it is, (Step 912) (step 914). On the other hand, if it is determined in step 906 that the sensing data major classification type information is normal, the packet processing section 410 proceeds to a process for confirming the sub classification on the sensing data major classification type information (step 916).

10 is a flowchart for processing a packet according to a sensing data subtype type when the sensing data major classification type in FIG. 9 is normally determined according to an embodiment of the present invention.

The packet processing unit 410 reads the sensing data subtype type information in the payload configuration of the application layer of the packet as shown in FIG. 3 (step 1000). Then, a normal confirmation process is performed on the sensing data subclass type information (step 1002). In one embodiment, the packet processing unit 410 can perform a normal check process on the sensing data subtype type information by referring to the table 700. [ That is, it is confirmed whether or not the sensing data sub-classification type information is registered in the table 700. If it is determined that the packet is abnormal or a default value corresponding to a predefined bypass, the packet processing unit 410 processes the packet according to the sensing data major classification type of the packet. That is, the packet processor 410 reads the destination address information of the sensing data major classification type in the table 600 (step 1004), checks whether the destination address information exists (step 1006), and if the packet exists, The process proceeds to the next step for delivering to the specified destination (step 1016). If it is determined in step 1006 that the destination address information does not exist, the packet processing unit 410 transfers the packet to the packet transmitting unit 420 as it is, switches to the reception waiting state for the next packet processing, and terminates (step 1008) (Step 1010).

On the other hand, if it is determined in step 1002 that the sensing data subtype type information is normal, the packet processing unit 410 reads the destination address information of the sensing data subtype type in the table 700 and determines whether the destination address information exists (step 1012) Step 1014). If not, the process goes to step 1004 to perform the same process (steps 1006 to 1010) described above. If it is determined in step 1014 that the destination address information exists, the packet processing unit 410 proceeds to the next step for delivering the packet to the destination specified by the operator (step 1016).

11 is a processing flowchart for delivering a packet to a destination address designated by an operator corresponding to a sensing data type in the packet processing unit of FIG. 4 according to an embodiment of the present invention.

The packet processor 410 checks the number of destination addresses to which the packet is to be transmitted through the table 600 of FIG. 6 or the table 700 of FIG. 7 according to the flow of FIG. 10 (step 1100). If the destination address number is one, the packet processing unit 410 modifies the destination address of the packet to the corresponding destination address specified in the table 600 or 700 (step 1102). Then, the packet processing unit 410 performs packet transmission filtering (step 1104), and enters the reception waiting state for the next packet processing and ends (step 1106). If there are a plurality of destination addresses, the packet processing unit 410 modifies the destination address of the packet to the first destination address among destination addresses specified in the table, and performs packet transmission filtering (step 1108) (step 1110 ). After performing the packet transmission filtering, the packet processing unit 410 checks whether the packet delivery is completed to all the destination addresses (step 1112). That is, it confirms whether the packet delivery is completed by the number of destination addresses. If not, the packet processor 410 copies the packet (step 1114). Then, the packet processing unit 410 modifies the destination address of the copied packet to the second destination address among the corresponding destination addresses specified in the tables 600 and 700, and performs packet transmission filtering. Then, steps 1108 to 1114 are repeated until packet transfer is completed for all the destination addresses. When the packet is transmitted to all the destination addresses, the packet processing unit 410 switches to the reception waiting state and terminates (step 1116).

12 is a specific example flowchart of the packet transmission filtering performing procedure shown in FIG.

Represents a packet transmission filtering function for suppressing repetitive packet transmission within a given transmission time interval. The packet processor 410 checks whether the transmission time interval information 630 or 740 is set to '0' in the table 600 of FIG. 6 or the table 700 of FIG. 7 (step 1200). If it is set to '0', the packet processing unit 410 transfers the packet to the packet transmitting unit 420 and terminates the process (step 1202). If the transmission time interval information 630 and 740 is set to a value other than '0', the packet processing unit 410 reads the packet transmission filtering table 800 of FIG. 8 to check whether there is a history of previous packet transmission (Step 1204) (step 1206). If there is no packet transmission history, the packet processing unit 410 transfers the packet to the packet transmission unit 420, adds a record of the packet transmitted to the packet transmission filtering table 800, and then terminates (step 1208) Step 1210). If there is a packet transmission history, the packet processor 410 compares the time of the previous packet transmission with the current time (step 1212). If the packet transmission history is smaller than the transmission time interval, the packet is discarded and terminated (step 1214) If the interval is greater than the interval, the packet is transmitted to the packet transmission unit 420, the transmission time is updated in the packet transmission filtering table 800, and the process is terminated (step 1216) (step 1218).

The present invention has been described with reference to the preferred embodiments. It will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention as defined by the appended claims. Therefore, the disclosed embodiments should be considered in an illustrative rather than a restrictive sense. The scope of the present invention is defined by the appended claims rather than by the foregoing description, and all differences within the scope of equivalents thereof should be construed as being included in the present invention.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a diagram illustrating an example of an entire network including a broadband IP network and sensor networks according to an embodiment of the present invention; FIG.

FIG. 2 is a diagram showing a protocol stack structure of a packet transmitted from a sensor network to an IP network; FIG.

3 is a diagram illustrating an application layer payload configuration example of a packet configured with sensor information according to an embodiment of the present invention;

4 is a block diagram of a network access device in accordance with an embodiment of the present invention.

5 is a table example in which sensing data types for classifying sensor information are classified.

6 is a table example for managing destination address information to be delivered according to a major classification type of sensing data and transmission time interval information to which the packet is delivered.

FIG. 7 is a table example for managing destination address information to be delivered according to a subtype type of sensing data and transmission time interval information to which the packet is delivered. FIG.

8 is an illustration of a packet transmission filtering table for suppressing unnecessary repetitive transmission of a packet;

FIG. 9 is a flowchart for processing a sensing data major classification type during the entire packet processing performed by the packet processing unit of FIG. 4 according to an embodiment of the present invention;

FIG. 10 is a flow chart for processing a sensing data subtype type when the sensing data major classification type in FIG. 9 is normally determined according to an embodiment of the present invention.

FIG. 11 is a flowchart illustrating a process for transmitting a packet to a destination address designated by an operator corresponding to a sensing data type in the packet processing unit of FIG. 4 according to an embodiment of the present invention.

12 is a specific example flow chart of the packet transmission filtering performing procedure shown in FIG.

Claims (10)

1. A network access device, which is implemented in an Internet Protocol (IP) network and connects external networks and the IP network, A packet receiver for receiving a packet transmitted from the external network; A packet processor for analyzing application layer information of the received packet to determine the type of the packet and for correcting a destination address of the received packet to a destination address preset for the detected type; And And a packet transmitter for transmitting the destination address-modified packet to a destination, Wherein the packet processing unit checks whether the difference between the current time at which the packet is received and the destination transmission time of the same transmission destination identifier and the same type of packet received before the packet is received is within a predetermined time interval, And discards the received packet if it is within a predetermined range. The method according to claim 1, Wherein the packet processor sequentially copies a packet and updates a destination address of a packet to a predetermined destination address when the destination address is preset according to the identified type. The method according to claim 1, Wherein the packet processing unit discards the packet if the identified packet type is an undefined type. delete 1. A network access device, which is implemented in an Internet Protocol (IP) network and connects external networks and the IP network, A packet receiver for receiving a packet transmitted from the external network; A packet processor for analyzing application layer information of the received packet to determine the type of the packet and for correcting a destination address of the received packet to a destination address preset for the detected type; And And a packet transmitter for transmitting the destination address-modified packet to a destination, If the type of the packet identified through the application layer information analysis is classified into one or more subtypes in the higher type, the packet processing unit modifies and outputs the destination address of the packet to a predetermined destination address for the lowest type, And if the destination address for the lowest type is abnormal, corrects the destination address of the packet to the destination address set for the upper type of the lowest type and outputs the corrected destination address. A packet transmission method implemented in an Internet Protocol (IP) network and performed in a network access device connecting external networks and the IP network, Analyzing application layer information of a packet received from an external network to determine a packet type; Modifying and outputting a destination address of a packet with a predetermined destination address for the type of the identified packet; And And transmitting the output packet to a destination, The step of modifying and outputting the destination address of the packet may include: if the type of the identified packet is classified into one or more sub-types in the higher type, the destination address of the packet is modified to a predetermined destination address for the lowest type, And if the destination address for the lowest type is abnormal, the destination address of the packet is modified to the destination address set for the upper type of the lowest type and output. The method of claim 6, wherein modifying and outputting the destination address of the packet comprises: And generating the packet by the number of the predetermined destination address and outputting the modified destination address to a different destination address if the number of the destination address is more than a predetermined number. Lt; RTI ID = 0.0 > accessing < / RTI > The method according to claim 6, And discards the packet if the type of the identified packet is an undefined type. A packet transmission method implemented in an Internet Protocol (IP) network and performed in a network access device connecting external networks and the IP network, Analyzing application layer information of a packet received from an external network to determine a packet type; Modifying and outputting a destination address of a packet with a predetermined destination address for the type of the identified packet; And And transmitting the output packet to a destination, Whether or not the difference between the current time at which the packet was received and the destination transmission time of the same identifier and the same type of packet received before the packet is received is within a predetermined time interval before the step of outputting the modified destination address, Checking; And Discarding the received packet if the time is within a preset time; The method comprising the steps of: receiving a packet from a network access device; delete

Images