KR20080051681A - Method for configuring network address translating table in mobile communication system and method for routing network address of base station - Google Patents

Abstract

A method for constructing a network address transmission table in a mobile communication system and a network address transformation routing method of a base station using the same are provided to reduce the use cost and maintenance cost significantly according to the use of the communication path. An NAT(Network Address transformation Table) is equipped in a base station(110) to implement an NAT routing function. The base station converts an IP(Internet Protocol) packet on the basis of the NAT and offers the NAT routing function. The NAT is constructed by one to one mapping between the private IP address of each additional device and a connection port between each addition device and the base station. The NAT table is constructed by one-to-one mapping of IP addresses of the entire additional devices by port numbers. The base station performs a routing function related to the up stream and down stream on the basis of the NAT table. Up/down streams are constructed by source IP and source port number, destination IP and destination port number.

Description

METHOD FOR CONFIGURING NETWORK ADDRESS TRANSLATING TABLE IN MOBILE COMMUNICATION SYSTEM AND METHOD FOR ROUTING NETWORK ADDRESS OF BASE STATION}

1 is a schematic diagram showing the configuration of an attachment management system according to the prior art;

2 is a schematic view showing the configuration of an additional device management system to which an embodiment of the present invention can be applied;

3 is a schematic diagram showing a network address translation (NAT) table configuration process and a network address translation (NAT) routing process of a base station using the same according to an embodiment of the present invention.

4 is a flowchart illustrating a down-stream routing procedure for transmitting a packet from an attachment server to the attachment during a network address translation (NAT) routing process according to an embodiment of the present invention.

5 is a flowchart illustrating an up-stream routing procedure for transmitting a packet from an attachment to an attachment server in a network address translation (NAT) routing process according to an embodiment of the present invention;

<Explanation of symbols for the main parts of the drawings>

10: additional device 20: additional device server

30: base station (Node-B) 40: control station (RNC)

50: network management device (NMS)

The present invention relates to the field of mobile communications, and more particularly, to a method of configuring a network address translation table in a mobile communication system and a method of routing a network address translation (NAT) of a base station using the same.

NAT is an IETF standard that allows multiple users in an enterprise or organization to access the Internet with only one public Internet Protocol (IP) address. A public IP that uses a private IP address outside the enterprise. This is a function that converts an address (Public IP Address). By this function, a large number of private IP addresses used internally are converted to public IP addresses defined through NAT when going out. Therefore, since it does not conflict with other public IP addresses outside, more people can use the Internet by configuring more private IP addresses than limited IP addresses.

In general, in a communication through an internal network with an internal network such as a company or an organization, a private IP address used in the internal network is mapped to one or more public IP addresses, transmitted to the outside, and received on the received packets. The public IP address is translated into a private IP address. As such, NAT has the advantage of reducing the number of public IP addresses by separating officially known IP addresses from private IP addresses. In addition, each request sent or received must go through an address translation process, which helps enhance security.

Meanwhile, in a general mobile communication system, an additional device server is used to manage additional devices such as a repeater or a radio frequency (RF) monitoring device that each base station has jurisdiction over. Since the conventional base station (Node-B) 10 does not provide a NAT routing function, the conventional attachment server 20 as shown in FIG. 1 uses a separate communication path (IP routing). There is no choice but to manage the additional device 30 can not take advantage of the NAT.

Therefore, the conventional mobile communication system has a disadvantage in that facility costs and maintenance costs are caused by using a separate communication path for managing the additional device (30).

Disclosure of Invention An object of the present invention is to provide a communication path (IP routing) for managing an additional device in a base station's jurisdiction through a NAT network in an asynchronous mobile communication system (WCDMA), and a method for configuring the network address translation table. It is to provide a network address translation (NAT) routing method of the base station used.

According to an embodiment of the present invention, a NAT table is configured by one-to-one mapping of a private IP address of each additional device having an IP address of a base station as a public IP address to a connection port between each additional device and the base station.

According to another embodiment of the present invention, a NAT routing method of a base station in a mobile communication system, a NAT table by mapping a private IP address of each additional device to each connection port between a plurality of additional devices managed by the base station and the base station Configuring a; Searching, by the base station, a private IP address mapped to source port number information of the downstream, based on the NAT table, in the downstream processing from the additional device server to the first additional device; And changing, by the base station, the destination IP address of the downstream to the searched private IP address, and the source IP address to the public IP address to the predetermined additional device.

According to an embodiment of the present invention, by implementing a NAT network using a base station in an asynchronous mobile communication system (WCDMA), a base station is in charge of a repeater, an additional device server, such as a radio frequency (RF) monitoring device, or the like. There is provided a method for managing additional devices through a NAT network.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings. However, in the following description, when there is a risk of unnecessarily obscuring the gist of the present invention, a detailed description of well-known functions and configurations will be omitted.

2 is a diagram schematically illustrating a configuration of an additional device management system to which an embodiment of the present invention can be applied.

As shown in FIG. 2, the present invention configures a NAT network using a base station (Nobe-B) 110. That is, in the IP network, the hub (Hub) and the base station (Node-B) 110 are interworked, and the router (Router) and the control station (RNC: Radio Access Network) 130 are interworked in the IP network.

The control station (RNC) 130 connects the base station (Node-B) 110 to the attachment server 120 through a router of the IP network. The base station (Node-B) 110 communicates with the additional device 100 through a hub of the IP network, and communicates with the control station (RNC) 130 by wire, so that the additional device 100 and the additional device server 120 ) Performs a signal processing function for communication between the two, in particular the NAT routing function of the present invention. That is, by implementing the NAT routing function to the base station (Node) 110, which will be described in more detail below, the additional device server 120 is connected to the additional devices 100 managed by the base station (Node-B) (110) It provides communication path (IP routing) to manage through NAT network.

The network management device (NMS) 140 is an integrated system configured to control devices for monitoring and controlling the mobile communication network through a single interface that can be used by an administrator. Manage. Each network element is distinguished by an address, and the links connecting the network elements each have a characteristic value. The network management device (NMS) 140 collects network resource information and state information from each of these network elements, Manage network elements.

3 is a diagram illustrating a network address translation table (NAT table) configuration process and a network address translation (NAT) routing process of a base station using the same according to an embodiment of the present invention.

In order to implement the NAT routing function, a network address translation table (hereinafter referred to as a NAT table) is provided in the base station (Node-B) 110. The base station (Node-B) 110 provides a NAT routing function by converting IP packets based on a NAT table.

The NAT table is a one-to-one mapping of a private IP address of each additional device having a base station's IP address as a public IP address and a connection port between each additional device 100 and the base station Node-B 110. Configure by mapping. For example, it is assumed that the address of the additional device server 120 is "60.1.1.1", the IP address of the base station 110 is "30.50.1.3", and the IP address of the accessory 1 is set to "192.168.1.1". Assume that the IP address of the additional device 2 is "192.168.1.2", and that the IP address of the additional device 3 is "192.168.1.3", the IP of the additional device 1 for the port number 1 ("10001"). Map address "192.168.1.1", map port number 2 ("10002") to IP address "192.168.1.2" of AP2, and port number 3 ("10003") to IP of AP3 Map the address "192.168.1.3". In this way, a NAT table is constructed by mapping IP addresses of all additional devices one-to-one by port number.

Based on the NAT table, the base station (Node-B) 110 upstream from the attachment 100 to the attachment server 120 or upstream of the attachment 100 from the attachment server 120. NAT routing can be performed on the down stream.

Up / Down Stream is composed of Source IP (Src IP), Source Port Number (Src PORT), Destination IP (Dst IP), and Destination Port Number (Dst PORT). It may be a status value transmission command of the additional device server 120, and may be a status measurement value of the additional device 100 as an example of an upstream.

In the base station (Node-B) 110, when downstream processing from the additional device server 120 to the additional device 1, the downstream (for example, the source IP (Src IP) address is “60.1”) based on the NAT routing table. .1.1 ", source port number (Src PORT) information is" 10001 ", destination IP (Dst IP) address is" 30.50.1.3 ", destination port number (Dst PORT) information is" 20000 "] After retrieving the IP address ("192.168.1.1") of the additional device 1 mapped to the source port information ("10001"), the destination IP address (in this case, the destination IP address of the downstream) is the base station 110. ) IP address ("192.168.1.1") and the source IP address ("60.1.1.1") to its own IP address ("30.50.1.3"). Send to Attachment 1. That is, the source IP (Src IP) address is "60.1.1.1", the source port number (Src PORT) information is "10001", the destination IP (Dst IP) address is "30.50.1.3", the destination port number (Dst PORT) Downstream with information "20000", source IP (Src IP) address "30.50.1.3", source port number (Src PORT) information "10001", destination IP (Dst IP) address "192.168.1.1", The destination port number (Dst PORT) information is "20000" to perform NAT routing function by changing the IP packet.

When the base station (Node-B) 110 performs the upstream processing from the attachment device 1 to the attachment server 120, the corresponding upstream [for example, the source IP (Src IP) address is “192.168.1.1” based on the NAT table. ", Source port number (Src PORT) information" 20000 ", destination IP (Dst IP) address" 30.50.1.3 ", destination port number (Dst PORT) information" 10001 " After retrieving the port number information ("10001") mapped to the IP address "192.168.1.1" of 1, set the destination port number information of the corresponding upstream to the retrieved port number information ("10001") and set the source IP address. It changes its IP address (" 30.50.1.3 ") and transmits it to the upper additional device server 120. That is, the source IP (Src IP) address is "192.168.1.1", the source port number (Src PORT) information is "20000", the destination IP (Dst IP) address is "30.50.1.3", the destination port number (Dst PORT) The source IP (Src IP) address is "30.50.1.3", the source port number (Src PORT) information is "20000", the destination IP (Dst IP) address is "60.1.1.1", The destination port number (Dst PORT) information is "10001" to perform NAT routing function through IP packet conversion.

As such, the private IP address of each additional device 100 is converted into one public IP address (the IP address of the base station 110), and one public IP address is associated with each private IP address using port number information. Mapped to one-to-many. At this time, the port number can be dynamically assigned.

As described above, through the NAT routing function provided by the base station 110, the additional devices 100 in the place where the base station 110 is installed are connected to the upper additional device server 120 through the communication path provided by the base station 110. Can be managed.

4 is a flowchart illustrating a down-stream routing procedure for transmitting a packet from an additional device server to the additional device during a NAT routing process according to an embodiment of the present invention.

First, the base station (Node-B) 110 waits for receiving an IP packet (downstream) from the higher layer device server 120 (401), and transmits from the higher layer device server 120 to the additional device 100. If the downstream is received, the source port number (Src PORT) information (for example, "10001") of the downstream is confirmed to determine whether the port defined on the NAT table (402).

As a result of the check 402, if the source port number (Src PORT) information (for example, "10001") of the downstream is not a port defined in the NAT table, the state transitions back to the waiting state (401).

Here, as an example of the downstream, the source IP (Src IP) address is "60.1.1.1", the source port number (Src PORT) information is "10001", the destination IP (Dst IP) address is "30.50.1.3", the destination The port number (Dst PORT) information may be "20000".

If the check result 402, the source downstream port information (Src PORT) information (for example, "10001") is a port defined in the NAT table, mapping to the source port number (Source Port) information ("10001") The IP address ("192.168.1.1") of the attached additional device 1 is searched (403).

Subsequently, the downstream destination IP (Destination) address (in this case, the destination IP address is the IP address of the base station 110) is changed to the IP address of the found attachment 1 ("192.168.1.1") and the source IP address ( "60.1.1.1") to its IP address ("30.50.1.3") (404), so that the changed downstream, ie, source IP (Src IP) address is "30.50.1.3", source port number (Src PORT ) In step 405, information "10001", a destination IP (Dst IP) address "192.168.1.1", and a destination port number (Dst PORT) information "20000" are transmitted to the additional device 1 (405).

FIG. 5 is a flowchart illustrating an upstream streaming procedure for transmitting a packet from an additional device to an additional device server during a NAT routing process according to an embodiment of the present invention.

First, the base station (Node-B) 110 waits to receive an IP packet (upstream) from the additional device 100 (501), and then upstream transmitted from the additional device 100 to the additional device server 120. If received, the source IP address of the corresponding upstream (for example, IP address "192.168.1.1" of the additional device 1) is checked to determine whether the IP is defined in the NAT table (502).

As a result of the check (502), if the source IP address of the upstream (for example, IP address "192.168.1.1" of the additional device 1) is not the IP defined in the NAT table, the state transitions to the reception waiting state again (501).

Here, as an example of the upstream, the source IP (Src IP) address is "192.168.1.1", the source port number (Src PORT) information is "20000", the destination IP (Dst IP) address is "30.50.1.3", the destination The port number (Dst PORT) information may be "10001".

As a result of the check 502, if the source IP address of the corresponding upstream (for example, IP address "192.168.1.1" of the attachment 1) is the IP defined in the NAT table, the source IP address (IP address "192.168 of the attachment 1). .1.1 ") to search for port number information (" 10001 ") mapped (503).

Subsequently, the destination port number information of the upstream is set to the retrieved port number information ("10001") and the source IP address is changed to its own IP address ("30.50.1.3") (504), thereby changing the upstream, that is, the source IP (Src IP) address is "30.50.1.3", source port number (Src PORT) information is "20000", destination IP (Dst IP) address is "60.1.1.1", destination port number (Dst PORT) information is " The upstream of 10001 "is transmitted to the additional device server 120 (505).

As described above, embodiments of the present invention use a NAT routing function implementation scheme, and use a "Masquerading" scheme, which is a dynamic NAT scheme. The "Masquerading" method is a special case of dynamic NAT, in which NAT is operated with only one public IP address. All private IP addresses are translated into a single public IP address, and one-to-many mapping with multiple private IP addresses using port numbers. At this time, the port number is also dynamically allocated.

Although the methods have been described through specific embodiments, the methods may also be embodied as computer readable code on a computer readable recording medium. Computer-readable recording media include all kinds of recording devices that store data that can be read by a computer system. Examples of computer-readable recording media include ROM, RAM, CD-ROM, magnetic tape, floppy disks, optical data storage devices, and the like, which are also implemented in the form of carrier waves (for example, transmission over the Internet). Include. The computer readable recording medium can also be distributed over network coupled computer systems so that the computer readable code is stored and executed in a distributed fashion. In addition, functional programs, codes, and code segments for implementing the above embodiments can be easily inferred by programmers in the art to which the present invention belongs.

In addition, while the present invention has been described in connection with some embodiments, it is to be understood that various modifications and changes can be made without departing from the spirit and scope of the invention as will be understood by those skilled in the art. You will need to know Also, such modifications and variations are intended to fall within the scope of the claims appended hereto.

According to the method of constructing the network address translation table and the network address translation routing method of the base station using the same according to the embodiments of the present invention, since a separate communication path is not required for the management of an additional device managed by the base station, There is an advantage that can significantly reduce the cost of use and maintenance.

Claims (14)

A method of configuring a network address translation table for a NAT routing function of a base station in a mobile communication system, And configuring a NAT table by one-to-one mapping of a private IP address of each additional device having a public IP address as a public IP address to a connection port between each additional device and the base station. The method of claim 1, The base station, In the downstream processing from the additional device server to the predetermined additional device, after searching for the private IP address mapped to the source port number information of the downstream based on the NAT table, the searched private IP address is searched for the destination IP address of the downstream. A method of configuring a network address translation table for converting an IP address and converting the changed private IP address to the IP address. The method of claim 1, The base station, In the upstream processing from the predetermined additional device to the additional device server, after retrieving the port number information mapped to the source IP address of the upstream based on the NAT table, the destination port number information of the corresponding upstream is searched for. And converting the source IP address into the public IP address and transmitting the number information. The method of claim 3, And a network address translation table for dynamically allocating the port number. As a NAT routing method of a base station in a mobile communication system, Constructing a NAT table by mapping one-to-one private IP addresses of each additional device to each connection port between the plurality of additional devices controlled by the base station and the base station; Searching, by the base station, a private IP address mapped to source port number information of the downstream, based on the NAT table, in the downstream processing from the additional device server to the first additional device; And The base station changing the downstream destination IP address to the searched private IP address and changing a source IP address to the public IP address and transmitting the same to the predetermined additional device; Network address translation routing method of a base station comprising a. The method of claim 5, Retrieving port number information mapped to a source IP address of a corresponding upstream based on the NAT table, in the upstream processing from the second additional device to the additional device server; And Transmitting, by the base station, the destination port number information of the corresponding upstream to the searched port number information, and changing the source IP address to the public IP address to the additional device server; Network address translation routing method of the base station further comprising. The method according to claim 5 or 6, Network address translation routing method of the base station to set the IP address of the base station to the public IP address. The method of claim 7, wherein A network address translation routing method of a base station for dynamically allocating the port number. A network address translation routing system of a base station, A NAT table is constructed by one-to-one mapping of a plurality of additional devices managed by a base station and a private IP address of each additional device to each connection port between the base stations, In the downstream processing from the additional device server to the first additional device, the base station searches for the private IP address mapped to the source port number information of the downstream based on the NAT table, And the base station changes the downstream destination IP address into the searched private IP address and the source IP address into the public IP address to transmit to the predetermined additional device. The method of claim 9, In the upstream processing from the second additional device to the additional device server, the base station searches for port number information mapped to the source IP address of the upstream based on the NAT table, And the base station converts the destination port number information of the upstream to the searched port number information and changes the source IP address to the public IP address and transmits the source port address to the additional device server. The method of claim 9 or 10, Network address translation routing system of the base station to set the IP address of the base station to a public IP address. The method of claim 11, A network address translation routing system of a base station for dynamically allocating the port number. A computer readable storage medium storing computer executable instructions for performing a method of configuring a network address translation table for a NAT routing function of a base station in a mobile communication system. The method, And configuring a NAT table by one-to-one mapping of a private IP address of each additional device with a public IP address of a base station to a connection port between each additional device and the base station. A computer readable storage medium storing computer executable instructions for performing a NAT routing method of a base station in a mobile communication system. Constructing a NAT table by mapping one-to-one private IP addresses of each additional device to each connection port between the plurality of additional devices controlled by the base station and the base station; Searching, by the base station, a private IP address mapped to source port number information of the downstream, based on the NAT table, in the downstream processing from the additional device server to the first additional device; And The base station changing the downstream destination IP address to the searched private IP address and changing a source IP address to the public IP address and transmitting the same to the predetermined additional device; Computer-readable storage medium comprising a.

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