KR100639376B1 - Method for assignning mobile network address of the mobile communication terminal - Google Patents

Abstract

The present invention relates to an addressing method in an ad-hoc network, and more particularly, a unique IP address using an electric serial number (ESN) of a mobile communication terminal in a mobile ad-hoc network. The present invention relates to a mobile network addressing method of a mobile communication terminal, which can reduce collision possibility of duplicate addresses in a duplicated address detection (DAD) process for automatic address allocation.

The above-described mobile network addressing method of a mobile communication terminal of the present invention comprises: a first step of determining IP version information; If the IP version is determined to be IPv4, the second step of generating a random number after reading the ESN of the mobile communication terminal and adding it to a 16-bit position after the prefix of the IPv4 address; Process; If the IP version is determined to be IPv6 as a result of the first step, the ESN of the mobile communication terminal is called, divided into eight digits of two digits, and expanded to add to the 64-bit position after the prefix of the IPv6 address. And a third process of generating a mobile network address.

Wireless network, ad hoc, ESN, access point (AP)

Description

Method for assignning mobile network address of the mobile communication terminal

1 is a schematic system configuration diagram of a mobile ad-hoc network in the prior art;

2 is a flowchart illustrating a process of a mobile network addressing method of a mobile communication terminal according to an embodiment of the present invention.

* Description of Major Symbols in Drawings *

10: communication network 20: basic service set A (BSS-A)

30: Basic Service Set B (BSS-B)

21, 31: access point

21, 22, 31, 33: wireless mobile terminal

The present invention relates to an addressing method in a mobile ad-hoc network, and more particularly, to a mobile ad-hoc using an ESN (Electrical Serial Number) of a mobile communication terminal in a mobile ad-hoc network. Move to enable automatic assignment of unique IP addresses for network access Move to reduce the likelihood of collisions caused by duplicate addresses generated by the process of duplicated address detection (DAD) during address autoconfiguration for ad-hoc network access A mobile network addressing method of a communication terminal.

An access point (AP) connected to a wired network may wirelessly connect each computer. This is called an infrastructure network and can be implemented by operating each IEEE 802.11 device in an infrastructure network mode. The network implemented in this way is called Extended Service Set (ESS).

In the above-described network, a mobile terminal such as a notebook or a mobile phone having a wireless LAN card is wirelessly connected to the AP, and then performs data communication with another network on the network to which the AP is connected. To this end, when a new user enters an area where an AP provides a service, the new user is automatically connected to the AP and connected to a wireless network. This network is called an ad-hoc network.

1 illustrates a schematic configuration of an ad-hoc network as described above, and includes an access point connected in a wired or wireless manner to a communication network 10 configured as a wired or wireless distribution system (Distribution System). AP: Basic Service Set A (BSS-A) 20 to which a wireless network service area is allocated by Access Point A (AP-A) 21 and Access Point B (AP-B); Basic service set B (BSS-B) 30 is formed, and a plurality of mobile terminals A1, A2, B1, and B2 having independent mobile addresses are included in the service areas of basic service sets A and B. .

In this case, the mobile terminal needs to set the network layer in order to receive the service by connecting the mobile terminal to the mobile ad hoc network (MANET) as described above. In case of the lower 64 bits, IP version 4 replaces the lower 16 bits of class c to generate an address. At this time, the address range assigned to the mobile ad hoc network (MANET) is 169.254 / 16 for version 4 and FEC0: 0: 0: FFFF :: / 64 for version 6. When the address is generated through the EUI-64 extension and flooded the NS (Neighbor Solicitation) message to the network before using the address, the address is used after DAD (Duplicated address detection) process is confirmed. If the address is already in use by someone else, generate a random (RANDOM) number to generate the sub-network address in the case of version 4 and the 64 bit number in the case of version 6 The address is assigned by performing the process of setting the address.

However, the above-described addressing process in the mobile ad hoc network of the prior art allows the DAD procedure to assign an address by a message transfer procedure depending on flooding in the autoconfiguration process of the mobile station. This will overload the network. In addition, due to the nature of the mobile ad hoc network (MANET) network partitions occur frequently has a problem that takes a long time in the address assignment process.

In addition, the above-described conventional address allocation method has a problem in that the probability of generating the same address is increased because the address is generated by a random number.

In addition, the hybrid mobile communication terminal (cellular & peer-to-peer) has recently been put to practical use, which enables multi-hop communication between users through a conventional ad-hoc network. In this case, when the IP resources of the existing cellular network are used for individual wireless communication, there is a problem that a waste of public address resources allocated for wired network use is caused.

Accordingly, the present invention addresses the problem of prolonging the address allocation time by flooding in the DAD procedure in the above-described automatic address setting process of the mobile ad hoc network of the prior art and the address for setting the network layer of the wireless mobile terminal by generating a random number. In order to solve the problem of collision caused by duplication of address and waste of public address resource, it is possible to access mobile ad hoc network by using serial serial information (ESN) of wireless mobile terminal. It is an object of the present invention to provide a mobile network addressing method of a mobile communication terminal that enables automatic address setting of a network layer for a mobile station.

A mobile network addressing method of a mobile communication terminal of the present invention for achieving the above object includes a first step of determining IP version information; A second step of generating a mobile network address by generating a random number using the ESN of the mobile communication terminal and adding the 16-bit position after the prefix of the IPv4 address when the IP version is determined to be IPv4 and; When the IP version is determined to be IPv6 as a result of the first step, the ESN of the mobile communication terminal is divided into eight digits of two digits and expanded to add a 64-bit position after the prefix of the IPv6 address to generate a mobile network address. It is characterized by consisting of a third process.

The second process may include reading the ESN; Dividing the read ESN into two four digits; Generating a random number by using each of the two divided four-digit numbers as a key value; Performing 255 modulation on the generated random number; And generating a mobile network address by allocating the result of performing the 255 modulation to the C and D classes of the IP address of the IPv4.

The C class address is a 255 modulation value generated by the upper four digits of the ESN, and the D class address is a 255 modulation value generated by the lower four digits of the ESN.

The third process includes reading the ESN; Dividing the read ESN into four numbers of two digits; Expanding the four divided numbers to be mapped to 64 bits; And adding the four numbers extended for the 64-bit mapping to the lower 64-bits of the EUI-64 to generate a mobile network address.

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

2 is a flowchart illustrating a process of a mobile network addressing method of a mobile communication terminal according to an embodiment of the present invention. For convenience of description in the description of the embodiment of the mobile network addressing method of the mobile communication terminal of the present invention with reference to FIG. 2, it is assumed that the ESN which is the manufacturing serial number of the mobile communication terminal is 8C772A13. In the description of one embodiment of the present invention, it is assumed that the mobile communication terminal is equipped with a random number generator for generating a random number for addressing.

As shown in FIG. 2, when the mobile communication terminal enters the service area of the mobile ad hoc network described above, an automatic address setting process for automatically setting a mobile network address in order to receive a wireless data communication service is performed.

After the automatic configuration process for the mobile network address is performed, the mobile communication terminal determines whether the ad hoc network to which it belongs is IPv4 or IPv6 (S100).

If the determination result of the process S100 described above is IPv4, the mobile communication terminal reads its own 8-digit serial serial number (ESN: Electrical Serial Number). The ESN number read next is divided into 8C77 of the upper four digits and 2A13 of the lower four digits (S110).

In operation S110, random numbers are generated by using the upper four digits and the lower four digits of the divided ESN as key values. For example, if the function for random generation is called SRAND (), random numbers are generated using SRAND (8C77) for the upper four digits and SRAND (2A13) for the lower four digits, respectively, to generate random numbers (S120). .

After generating the random number SRAND (8C77) generated by using the upper four digits 8C77 of the ESN of the mobile communication terminal as the key value and the random number SRAND (2A13) generated by using the lower four digits 2A13 as the key value in S120 Perform 255 module operations on the generated random numbers. The 255 modulation value of the random number generated by the upper four digits 8C77 of the ESN among the numbers generated by the 255 modulation is designated as the C class value among the IPv4 network addresses. Next, the 255 modulation value of the random number generated by the lower four digits 2A13 of the ESN among the numbers generated by 255 modulation is designated as the D class value among the IPv4 network addresses. By the process as described above, it is possible to generate a network address of IPv4 that can be used in the mobile ad hoc network of the mobile communication terminal (S130).

Next, the address is generated by combining the network address of the IPv4 generated in step S130 with the prefix. That is, in the case of IPv4 as in the prior art, in the configuration of 169.254 / 16 bits, by inserting the 8-bit C-class address and D-class address generated in step S130 into the lower 16-bit region in the prefix of 169.254, it is unique to the mobile communication terminal. Generates a mobile ad hoc network address of the mobile communication terminal for the mobile ad hoc network access is granted (S140).

After the mobile communication terminal sets the mobile ad hoc network address to the terminal by the process of S110 to S140, the mobile communication terminal can access the mobile ad hoc network to perform communication.

Next, a mobile ad hoc network address generation process of the mobile communication terminal in case of IPv6 will be described.

In the process of FIG. 2, when it is determined that IPv6 is used unlike the processes of S110 to S140 described above in step S100, the ESN may be mapped to exactly 64 bits. That is, as described in the prior art, in the case of IPv6, the value generated by the ESN is correctly mapped to the lower 64 bits of the EUI-64 extension formed of FEC0: 0: 0: FFFF / 64.

Therefore, the mobile terminal reads its own 8-digit serial serial number (ESN: Electrical Serial Number) and divides the ESN number into four numbers having two digits sequentially from the upper number. That is, in one embodiment of the present invention, the ESN is divided into four numbers of 8C: 77: 2A: 13 (S150).

Next, the mobile communication terminal expands 8C: 77: 2A: 13 divided into four numbers in step S150 to 8C8C: 7777: 2A2A: 1313 to have 64 bits (S160).

Thereafter, the value generated in step S160 is combined with the prefix to generate an address for accessing the mobile ad hoc network of the mobile communication terminal. That is, as described in the above description of the prior art, generated in the step S160 in the lower 64 bits of the prefix FEC0: 0: 0: FFFF 8C8C: 7777: 2A2A: 1313 is inserted to generate a unique address FEC0: 0: 0: FFFF: 8C8C: 7777: 2A2A: 1313 for a mobile ad hoc network connection of the mobile communication terminal (S170).

The present invention described above is unique to a mobile communication terminal in generating an address required for peer-to-peer communication through an automatic address setting method proposed by a mobile ad-hoc network (MANET). By using the ESN, a single unique IP address uniquely assigned to each mobile communication terminal can be generated.

As described above, the present invention enables the generation of a single unique IP address using the unique ESN of the mobile communication terminal in the automatic configuration of the IP address for accessing the mobile ad hoc network, thereby wasting the shared IP address. In addition, the present invention provides an effect of shortening the automatic address setting time for accessing the mobile ad hoc network by eliminating the procedure of acquiring the IP address by the flooding process according to the DAD.

In addition, the present invention described above does not generate an address by generating a random number in the prior art, but sets an IP address using a unique ESN of the mobile communication terminal, thereby preventing the generation of duplicate addresses as in the prior art. It provides an effect of solving the conflict problem between terminals having the same IP address.

Claims (4)

A first step of determining IP version information; A second step of generating a mobile network address by generating a random number by using the ESN of the mobile communication terminal and adding the 16-bit position after the prefix of the IPv4 address when the IP version is determined to be IPv4 and; When the IP version is determined to be IPv6 as a result of the first step, the ESN of the mobile communication terminal is divided into eight digits of two digits and expanded to add a 64-bit position after the prefix of the IPv6 address to generate a mobile network address. A mobile network addressing method of a mobile communication terminal, characterized in that comprises a third step. The method of claim 1, wherein the second process comprises: Reading the ESN; Dividing the read ESN into two four digits; Generating a random number by using each of the two divided four-digit numbers as a key value; Performing 255 modulation on the generated random number; And assigning a result value of the 255 modulation to a C class and a D class of the IP address of the IPv4 to generate a mobile network address. The method of claim 2, wherein generating the mobile network address comprises: The C class address is a 255 modulation value generated by the upper four digits of the ESN, The class D address is a mobile network addressing method of a mobile communication terminal, characterized in that 255 modulation value generated by the lower four digits of the ESN. The method of claim 1, wherein the third process comprises: Reading the ESN; Dividing the read ESN into four numbers of two digits; Expanding the four divided numbers to be mapped to 64 bits; And generating the mobile network address by adding the four numbers extended for the 64-bit mapping to the lower 64-bits of the EUI-64.

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