KR101709874B1 - Ip address allocation method and ip address allocation server for performing the method - Google Patents

Abstract

The present invention relates to an IP address allocation method and an IP address allocation server. After analyzing the domain type and the device type of characteristic information included in a message received from a user terminal to grasp the communication pattern of the user terminal, it is possible to allocate an appropriate IP address according to the characteristic information of the user terminal, by using a lease time set differently according to the communication pattern of the identified user terminal and an address tolerance range mapped to the lease time. So, it is easy to search and manage the IP address according to the user terminal.

Description

TECHNICAL FIELD [0001] The present invention relates to an IP address allocation method and an IP address allocation method,

The following description relates to an IP address assignment method and an IP address assignment server for performing the method. More particularly, the present invention relates to an IP address assignment method for analyzing a communication pattern of a user terminal in response to a dynamic assignment request for an IP address received from a user terminal, And an IP address allocation method and an IP address allocation server for allocating an appropriate IP address according to a communication pattern.

In recent years, mobile Internet services are increasing due to widespread use of wired / wireless communication services and smart devices. As a result, the demand for IP addresses is rapidly increasing due to the arrival of the Internet service era. In this situation, the assignable addresses of IPv4 address (IP Version 4), which can allocate 4.3 billion IP addresses in total, are gradually being reduced. To solve this problem, a network address translation (NAT) .

In other words, in an IPv4 network, NAT is a network address translator used to connect internal networks by converting packets between the internal network and the Internet using private address space. Here, the reason for using NAT is to delay exhaustion of IPv4 addresses by using only a small number of global (external) addresses in large-scale internal networks. However, NAT actually delays IPv4 address exhaustion and does not solve the problem of large scale expansion in practice.

As a result, IPv6 (IP Version 6) addressing is being addressed as a way to solve the problem caused by depletion of IPv4 addresses. This is because the IPv6 address scheme can theoretically generate infinite IP addresses. However, since the currently used network address system is an IPv4 address system, the IPv4 address system and the IPv6 address system can not coexist in the transition to the IPv6 address system. For this reason, the IPv6 address system was considered as a realistic solution, not a full-fledged transition but a gradual and point-to-point conversion, and it became important to search for effective coexistence.

However, for a number of years, various types of conversion technologies have been proposed for R & D and conversion, but the application to IPv6 networks has not been successful. This is mainly due to the fact that research has been carried out only in terms of technology, and it has not reflected the approach of the service side or the market requirements.

In addition, the introduction of the IPv6 address system on a large scale was a time when many improvements were required in terms of equipment performance. The most important reason is that many network equipment, infrastructure, services and Internet devices still support only IPv4 addresses. In other words, the introduction of IPv6 addresses did not proceed as fast as expected, and research and development also reached a lull. In particular, in terms of service providers, the introduction of IPv6 made it uneconomical to build an infrastructure in a situation where profit generation was uncertain. This was also one of the reasons for delaying the adoption of IPv6.

Therefore, an " address resource sharing technique " is required in which a large number of Internet devices can efficiently share a limited IPv4 address. Typically, an " address resource sharing technique " In the DHCP method, an Internet device does not use a fixed IP address but temporarily uses an arbitrary IP address for a certain period of time.

As a result, the DHCP network manager manages the IP address automatically, rather than the method of assigning and setting the IP address directly. At this time, when an Internet device attempts to access the network through DHCP, the Internet device can dynamically receive an IP address from DHCP. Therefore, it is widely used in wireless LAN (WLAN) and home network where Internet devices frequently connect and renew connections.

However, the DHCP method is not efficient in cache management for storing addresses, MAC addresses, lease times, and the like allocated to Internet devices as addresses are allocated in a random manner at the request of an Internet device. In addition, the DHCP method assigns the same lease time to all the Internet devices irrespective of the type of the Internet device requesting the IP address allocation, and thus has a structure that can adversely affect the turnover rate in a situation where the IP address is insufficient.

Accordingly, there is a need for a method that can allocate IP addresses more efficiently considering the types of Internet devices according to requests for IP address allocation of internet devices based on the DHCP method.

The present invention relates to a method and apparatus for distinguishing a type of a user terminal requesting an IP address assignment based on a DHCP scheme and setting an assignable range of address available according to the classified type, An IP address allocation method, and an IP address allocation server.

The present invention relates to a method and apparatus for classifying a type of a user terminal requesting an IP address allocation based on a DHCP method and determining a lease time for an IP address according to the classified type, An allocation method and an IP address allocation server.

A method of managing an IP address performed by an IP address management server according to an exemplary embodiment includes receiving a message for receiving an IP address from a user terminal; Confirming characteristic information of a user terminal including a domain type and a device type in response to the message; And determining a lease time according to the characteristic information, and allocating the determined IP address to the user terminal.

The domain type according to an exemplary embodiment includes information for distinguishing a type according to an operation provided by the user terminal, and the device type includes a type according to a usage pattern between a user and a user terminal based on a domain type of the user terminal As shown in FIG.

The step of allocating the IP address to the user terminal according to an embodiment may determine a different lease time for each user terminal in consideration of the address turnover rate according to the communication pattern of the user terminal according to the characteristic information.

In the step of allocating the IP address to the user terminal according to the embodiment, the higher the address rotation rate according to the communication pattern of the user terminal, the shorter the rental time of the IP address allocated to the user terminal.

The step of assigning an IP address to a user terminal according to an exemplary embodiment may search an address availability range corresponding to the determined lease time and allocate an unassigned IP address to the user terminal.

The IP address assignment method and the IP address assignment server according to an embodiment of the present invention classify the types of user terminals requesting IP address allocation based on the DHCP method and set an assignable address range according to the classified type , It is easy to search and manage the IP address according to the user terminal.

The IP address assignment method and the IP address assignment server according to an embodiment of the present invention classify the types of user terminals requesting IP address allocation based on the DHCP method, , It is possible to improve the address turnover rate to the IP address.

1 is a diagram illustrating an operation procedure for assigning an IP address according to an exemplary embodiment of the present invention.
2 is a diagram illustrating a structure of an Ethernet header reflecting a type of a user terminal according to an exemplary embodiment.
FIG. 3 is a detailed configuration for identifying a device type of a user terminal according to an exemplary embodiment. Referring to FIG.
FIG. 4 illustrates a type of a user terminal according to an exemplary embodiment of the present invention.
FIG. 5 is a diagram illustrating an address availability range for an IP address according to an exemplary embodiment of the present invention. Referring to FIG.

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 operation procedure for assigning an IP address according to an exemplary embodiment of the present invention.

Referring to FIG. 1, the IP address assignment server 101 may assign an IP address to the user terminal 102 in response to a message transmitted from the user terminal 102. Here, the IP address assignment server 101 may be a server using a Dynamic Host Configuration Protocol (DHCP) scheme known as an address resource sharing technology. The IP address assignment server 101 can use the following three types of address allocation methods based on the DHCP method.

 (i) Manual Allocation

(ii) Automatic Allocation: Static / Permanent automatic allocation

(iii) Dynamic Allocation: Dynamic / Temporary automatic allocation

The IP address assignment server 101 can allocate an IP address to the user terminal 102 by using Dynamic Allocation among the three types of address assignment methods described above. In other words, the IP address assignment server 101 can use dynamic allocation, which can dynamically allocate an IP address whenever the user terminal 102 accesses the network based on the DHCP method.

At this time, the IP address assignment server 101 can identify the type of the user terminal 102 in allocating an arbitrary IP address to the user terminal 102 for a predetermined time. Here, the IP address assignment server 101 can identify the type of the user terminal 102 based on the characteristic information of the user terminal 102 transmitted through the DHCP Discover operation according to the DHCP protocol operation procedure. The IP address assignment server 101 may determine a different lease time for the IP address corresponding to the type of the separated user terminal 102. [ Thereafter, the IP address assignment server 101 may allocate an IP address not yet allocated among the IP addresses existing within the address available range mapped to the determined lease time to the user terminal 102.

Specifically, the IP address assignment server 101 may perform a DHCP protocol operation procedure as shown in FIG.

In operation 103, the user terminal 102 may transmit a message to the IP address assignment server 101 to receive the IP address. Here, the message may refer to a broadcast message for searching the IP address assignment server 101 to which the user terminal 102 can assign an IP address. The user terminal 102 may broadcast a message on the network including a MAC address as a main parameter for identifying the user terminal 102 transmitting the message.

For example, the user terminal 102 may broadcast the message "There is a DHCP server, please respond" through DHCP Discover on a LAN (same subnet).

In step 104, the IP address assignment server 101 may receive the broadcast message from the user terminal 102. The IP address assignment server 101 can determine an IP address that can be assigned to the user terminal 102 based on the received message. That is, the IP address assignment server 101 can deliver network information including an IP address that can be assigned to the user terminal 102, rather than merely transmitting a response message to the broadcast message.

To this end, the IP address assignment server 101 can confirm the characteristic information of the user terminal 102 included in the received message. The message may include a MAC address that can identify the user terminal 102. The IP address assignment server 101 can determine the characteristic information of the user terminal 102 based on the MAC address included in the message. Here, a detailed configuration for grasping the characteristic information of the user terminal 102 will be described with reference to FIG.

The IP address assignment server 101 can determine the lease time of the IP address for the user terminal 102 based on the confirmed characteristic information. In other words, the IP address assignment server 101 identifies the type of the user terminal 102 according to the characteristic information, and determines the communication pattern for the user terminal 102 based on the classified type, You can set different lease times for IP addresses. Thereafter, the IP address assignment server 101 can extract an IP address that is not yet assigned among the IP addresses included in the address available range mapped to the set lease time.

In step 105, the IP address assignment server 101 receives the message transmitted from the user terminal 102 and transmits a response message to the received message. Here, the IP address assignment server 101 may transmit a response message including the IP address assignable to the user terminal 102 to the user terminal 102.

For example, the IP address assignment server 101 may send an IP address (determined in step 104) to the user terminal 102 via the DHCP Offer message " Can be transmitted. That is, the IP address assignment server 101 can transmit information on the MAC address of the user terminal 102 and the IP address assignable to the user terminal 102.

In step 106, the user terminal 102 may receive a response message including information on the IP address from the IP address assignment server 101. [ At this time, the user terminal 102 may receive a response message from one or more IP address assignment servers 101 in response to a message broadcast on the LAN. The user terminal 102 may select one IP address assignment server 101 through the received response message and request network information according to the IP address to the IP address assignment server 101.

For example, the user terminal 102 can transmit a request to the IP address assignment server 101 via the DHCP request, "Please use the IP address to forward the network information".

In step 107, the IP address assignment server 101 can allocate the corresponding IP address by transmitting the network information about the IP address in response to the request of the user terminal 102. [ At this time, the IP address assignment server 101 can inform the user terminal 102 of a time when the user terminal 102 can use the IP address by transmitting a lease address corresponding to the IP address assigned to the user terminal 102.

The user terminal 102 can then perform a network connection according to the lease time for the IP address and the IP address allocated from the IP address assignment server 101. [

2 is a diagram illustrating a structure of an Ethernet header reflecting a type of a user terminal according to an exemplary embodiment.

Referring to FIG. 2, the user terminal 202 may forward a message to the IP address assignment server 201 in order to receive an IP address through DHCP Discover. Here, the message may include the MAC address 203 as information that can identify the user terminal 202. Here, the MAC address 203 may include information for identifying the type of the user terminal 202. The structure of the MAC address 203 is 14 bytes and may include information such as a destination MAC address 204, a source MAC address 205, an Ethernet type 206, data, and a CRC.

At this time, the Ethernet type 206 is composed of 2 bytes. In assigning an IP address to the user terminal 202, the IP address assignment server 201 transmits characteristic information for identifying the type of the user terminal 202 . For this purpose, the Ethernet type 206 can be divided into a domain type 207 and a device type 208 each having 1 byte, and a divided domain type 207 and a device type 208 type 208 may represent characteristic information that can identify the type of the user terminal 202.

The domain type (207) may be information for distinguishing a type according to an operation provided by the user terminal (202). In other words, the domain type may be information that can distinguish a type according to what kind of service a user can receive through a user terminal.

The device type 208 may include information for classifying a type according to a usage pattern between a user and a user terminal based on a domain type of the user terminal. Here, the usage pattern may indicate the user's tendency to use according to the closeness between the user and the user terminal.

The IP address assignment server 201 can determine the type of the user terminal 202 based on the characteristic information of the user terminal 202 included in the message transmitted from the user terminal 202. Here, a detailed configuration for determining the type of the user terminal 202 will be described with reference to FIG.

In assigning an IP address according to a message transmitted from the user terminal 202, the IP address assignment server 201 does not allocate an arbitrary IP address to all the terminals but identifies the type of the user terminal 202 , And a different IP address can be assigned according to the classified type. The IP address assignment server 201 may receive the message including the characteristic information from the user terminal 202 at the time of DHCP Discover to distinguish the type of the user terminal 202 according to the different IP address allocation.

The IP address assignment server 201 can then determine the type of the user terminal 202 using the characteristic information included in the message received from the user terminal 202 at the time of DHCP Discover. The IP address assignment server 201 can determine a different lease time for each user terminal in consideration of the address turnover rate based on the communication pattern of the user terminal according to the characteristic information. The IP address assignment server 201 can determine a different lease time for each user terminal so that the lease time of the IP address allocated to the user terminal becomes shorter as the address rotation rate based on the communication pattern of the user terminal becomes higher.

The IP address assignment server 201 may also be configured to determine whether the user terminal 202 is in an active state or in a non-active state based on (i) the location of the user terminal 202, (ii) It is possible to determine a different lease time for each user terminal.

(i) the location of the user terminal

The IP address assignment server 201 may determine the lease time considering the current location of the user terminal 202. [ In other words, the IP address assignment server 201 can determine the lease time considering whether the user terminal 202 is located at a suitable place where the network can be used.

For example, when the current location of the user terminal is located in a classroom or a laboratory, the IP address allocation server 201 recognizes that the user is frequently moved to a situation where the user must listen to a class or a lecture, The lease time of about one hour can be determined.

In another example, when the current location of the user terminal is located in the faculty room or office, the IP address allocation server 201 may determine the lease time of the IP address as long as possible, considering that the user is not frequently moved have.

In another example, if the current location of the user terminal is a large mobility space such as a cafe or a public place, the IP address allocation server 201 may determine a lease time shorter than the lease time allocated to the classroom or lab .

(ii) a time zone or a season when the message is received from the user terminal 202

The IP address assignment server 201 can determine the lease time considering the time zone or the season in which the message is received from the user terminal 202. [ In other words, when the IP address assignment server 201 receives the message from the user terminal 202, it can determine the peak time zone and determine an appropriate lease time corresponding to the message transmitted in the peak time zone.

For example, when an IP address allocation request is concentrated on a peak time zone or a weekday on which a user is driven, the IP address allocation server 201 can determine the lease time of the IP address for the user terminal 202 to be short. On the contrary, when the IP address allocation request is concentrated on the peak time zone during the peak period or the weekday on the weekday, the IP address allocation server 201 may determine the lease time of the IP address for the user terminal 202 for a long time.

(iii) Activity

The IP address assignment server 201 can determine the lease time considering the amount of activity that the user terminal 202 accesses. In other words, when the activity (contact request activity) for the user terminal 202 requesting assignment to the IP address is frequent, the IP address assignment server 201 determines the lease time of the corresponding user terminal 202 for a long time , The lease time of the user terminal 202 can be shortened.

The IP address assignment server 201 may search an address availability range corresponding to the determined lease time and allocate an unassigned IP address to the user terminal.

FIG. 3 is a detailed configuration for identifying a device type of a user terminal according to an exemplary embodiment. Referring to FIG.

Referring to FIG. 3, the IP address assignment server can determine the type of the user terminal based on the characteristic information of the user terminal included in the message transmitted from the user terminal. And the characteristic information of the user terminal may refer to an Ethernet type included in the MAC address of the user terminal. The Ethernet type is divided into a domain type and a device type, and information for determining the type of the user terminal can be provided through the divided information.

More specifically, the domain type may be information that distinguishes the type according to the operation provided by the user terminal. In other words, the domain type may be information that can distinguish a type according to what kind of service a user can receive through a user terminal. For example, it can be assumed that the terminal A is a cellular phone that performs an operation such as a phone / message / application, and the terminal B is a sensor that performs an operation of collecting information from a plurality of sensors. The domain type of the terminal A may represent the mobile type and the domain type of the terminal B may represent the sensor type according to the operation type.

The device type may include information for classifying the type according to the usage pattern between the user and the user terminal based on the domain type of the user terminal. Here, the usage pattern may indicate the user's tendency to use according to the closeness between the user and the user terminal. That is, when the user uses the user terminal, the user can display different usage patterns according to the characteristics of the user terminal.

Referring to FIG. 3 (a), a user can use a mobile phone that is easy to carry as a user terminal. In the case of a mobile phone, the user uses the mobile phone in contact with a part of the user's body by holding it in the user's hand or putting it in a pocket of clothes.

Referring to FIG. 3 (b), the user can use the notebook as a user terminal. In the case of a notebook, a user fixes the notebook in a specific place, and then uses the notebook in a fixed position. As a result, the user has a high degree of close contact with the user terminal depending on what type of terminal the user terminal is, and the usage patterns thereof may be different.

And, this usage pattern can indicate the mobility of the user terminal when the IP address is allocated. In other words, the mobile phone is kept in a part of the user's body, and movement to the position frequently occurs according to the movement of the user. On the other hand, as the notebook is fixed at a specific place, the position may not move almost regardless of the user's movements.

Therefore, the user terminal can collect information about the IP address from the IP address allocation server based on the characteristic information of the user terminal to receive the IP address, .

FIG. 4 illustrates a type of a user terminal according to an exemplary embodiment of the present invention.

Referring to FIG. 4, the table shown in FIG. 4 may be data classified into a domain type and a device type according to the type of a user terminal. In other words, the IP address allocation server can analyze the MAC address included in the message transmitted through the DHCP Discover from the user terminal. At this time, the IP address assignment server can confirm the characteristic information of the user terminal from the newly defined Ethernet type in the MAC address.

The characteristic information of the user terminal may be divided into a domain type and a device type that can distinguish the type of the user terminal, and the IP address assignment server may classify the lease time for the IP address assignable to the corresponding user terminal Can be determined. The detailed configuration for determining the lease time will be described with reference to FIG.

FIG. 5 is a diagram illustrating an address availability range for an IP address according to an exemplary embodiment of the present invention. Referring to FIG.

Referring to FIG. 5, the IP address assignment server can determine a lease time for an IP address assignable to a user terminal using data according to the type of the user terminal classified through FIG.

Generally, an IP address allocation server has a concept of 'lease' for an IP address according to a request of a user terminal. When assigning an IP address to a user terminal, the IP address allocation server transmits an IP address and a lease time for an IP address that the user terminal can use together, and returns the corresponding IP address after the lease time, The turnover rate and availability of the system can be increased. The lease time may be set in consideration of a case where the number of terminals requesting an IP address is larger than an IP address assignable by the IP address assignment server.

In other words, if the IP address assignment server can assign 255 IP addresses but only one user terminal using 255 IP addresses, the lease time of the IP address for one user terminal is meaningful I will not. Accordingly, it may be desirable for the IP address assignment server to set the lease time for the IP address to the MAX value. For example, a lease time can be set to a maximum value because no lease time is meaningful for a user terminal using a home router.

On the other hand, if A company has 255 IP addresses and 300 employees, and if 300 people do not have Internet at the same time, it is up to the company to have 300 IP addresses It would be a waste. Therefore, it is effective to allocate 255 retention IPs whenever employees request them, and then collect them after use.

However, if the performance or usage of the user terminal using the IP address differs depending on the employee requesting the IP address, it may be inefficient to retrieve the IP address for the same lease time. This is because it is necessary to repeat the process of reassigning the recovered IP address to the employee.

Accordingly, the IP address allocation server can determine the type of the user terminal to increase the turnover rate and availability for the IP address, and determine a different lease time according to the determined type of the user terminal. That is, the IP address assignment server can determine the lease time considering the turnover rate of the IP address according to the domain type and the device type for the user terminal.

At this time, the turnover rate with respect to the IP address can be determined by the communication pattern of the user terminal according to the domain type and the characteristic information according to the device type. In other words, when a user desires to allocate an IP address to the mobile phone, the mobile phone generally changes its position according to the location of the user, and the longer the rental time is set, the lower the rotation rate of the IP address. On the other hand, since the location of the notebook is not changed irrespective of the user's location movement, the shorter the lease time is set, the lower the rotation rate of the IP address is.

As a result, a high-mobility user terminal (EX, mobile phone) may be a pattern that uses a network using an IP address for a short period of time in a communication pattern, and a low-mobility user terminal In a pattern, it may be a pattern that uses the network using an IP address for a longer time than a user terminal with high mobility in a semi-fixed position.

The communication pattern of the user terminal can be confirmed through the property information included in the message transmitted from the user terminal. As a result, the IP address assignment server can determine a different lease time for each user terminal in consideration of the address turnover rate based on the communication pattern of the user terminal according to the characteristic information of the user terminal.

Accordingly, the IP address assignment server can determine the lease time so that the lease time of the IP address allocated to the user terminal becomes shorter as the address rotation rate based on the communication pattern of the user terminal becomes higher. For example, the IP address assignment server can be divided into four stages according to the address turnover rate to the IP address: a device with high IP turnover rate, a device with low IP turnover rate, a device with low IP turnover rate / registered device. Here, each step can be determined according to the device type.

The IP address allocation server can determine an IP address that can be allocated to the user terminal by using the mapped address availability range corresponding to the determined lease time. In other words, the IP address allocation server sets a range of IP addresses that can be allocated in correspondence with the divided steps according to the lease time, and assigns an IP address within the address available range corresponding to the lease time to the user terminal have.

In this case, the IP address allocation server can set the address availability range so that the address located in front of the user terminal having the high turnover rate of the IP address can be allocated considering the address turnover rate with respect to the IP address. The IP address assignment server may set an address availability range so that a lower-order address is allocated to a user terminal having a lower IP address turnover rate.

In other words, assuming that the address range to be allocated is 210.53.48.1 to 254, that is, 254, the IP address allocation server searches all 1 to 254 IP addresses in assigning the IP address to the user terminal , Any IP address that has not yet been assigned can be assigned to the user terminal. In this case, the IP address assignment server may be inefficient in assigning an IP address as it must perform a search for all assignable IP addresses.

Accordingly, the IP address assignment server can search for an IP address more quickly as it can be allocated to an address located in front of a terminal having a higher address turnover rate for an IP address. In addition, the IP address assignment server can allocate a fixed IP address to the user terminal by allocating the IP address assignment server to a user terminal registered in advance or a user terminal having a low address turnover rate with respect to the IP address.

As a result, the IP address allocation server can determine the Ethernet type of the MAC header in the " DHCP Discover message " sent from the user terminal based on the DHCP method, and then give the corresponding lease time.

For example, if the Ethernet type is 0xF0F0, it is recognized that the user terminal that transmitted the message is a laptop, and that the address rotation rate according to the communication pattern for the laptop is not high. The lease time can be determined.

As a result, the IP address assignment server can determine the Ethernet type of the MAC address in the "DHCP Discover message" sent by the user terminal based on the DHCP method, and assign an IP address corresponding to the user terminal. Accordingly, the IP address assignment server can easily manage the address allocation and the lease time, and can quickly find the user terminal that reconnects and the user terminal that requests the lease time again.

Accordingly, the IP address allocation server can effectively improve the IP address turnover and management according to the user terminal by classifying the type of the user terminal in the IoT environment.

The methods according to embodiments of the present invention may be implemented in the form of program instructions that can be executed through various computer means and recorded in a computer-readable medium. The computer-readable medium may include program instructions, data files, data structures, and the like, alone or in combination. The program instructions recorded on the medium may be those specially designed and constructed for the present invention or may be available to those skilled in the art of computer software.

While the invention has been shown and described with reference to certain preferred embodiments thereof, it will be understood by those of ordinary skill 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. This is possible.

Therefore, the scope of the present invention should not be limited to the described embodiments, but should be determined by the equivalents of the claims, as well as the claims.

101: IP address allocation server
102: user terminal
103: DHCP Discover Step
104: Steps to set the lease time
105: DHCP Offer step
106: DHCP Request phase
107: DHCP ACK step

Claims (5)

An IP address management method performed by an IP address management server,
Receiving a message for receiving an IP address from a user terminal;
A domain type for distinguishing the operation type of the user terminal according to a service that can be provided by the user, and ii) a device type for distinguishing the characteristics of the user terminal according to the closeness between the user and the user terminal, Identifying characteristic information of the user terminal;
Analyzing a communication pattern related to a time of using the network using the IP address in the user terminal based on the characteristic information;
Determining a lease time of the user terminal so that the lease time of the IP address allocated to the user terminal becomes shorter as the address rotation rate of the user terminal becomes higher, based on the analyzed communication pattern of the user terminal; And
Assigning the determined lease time-assigned IP address to the user terminal
Lt; / RTI >
The closeness between the user and the user terminal,
As the position of the user terminal is frequently changed according to the movement of the user, the close contact between the user and the user terminal increases,
The address turnover rate,
Wherein the IP address assignment method increases the address turnover rate as the time taken to use the network according to the communication pattern of the user terminal becomes shorter. delete delete delete The method according to claim 1,
Wherein the step of assigning the IP address to the user terminal comprises:
And searching for an address availability range corresponding to the determined lease time to allocate an unassigned IP address to the user terminal.

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