KR101337777B1 - address mapping method between IPv6 multicast and IEEE802.16 connection identifier in wireless broadband access network - Google Patents

Abstract

The present invention relates to a multicast address translation / reverse translation method and a packet forwarding method using the same in a portable internet network. ), A method of converting the link layer into link identification information (CID) serving as an address of the link layer [IEEE 802.16 multicast CID], an inverse transform method thereof, and a packet forwarding method using the same.

To this end, the present invention provides a method for translating a multicast address in a portable Internet network (IEEE 802.16 network), the method comprising: determining whether a packet to be transmitted is an IPv6 packet; Identifying a multicast address of a network layer for forwarding the IPv6 packet, and extracting range information and multicast group identification information from the identified multicast address; And configuring multicast connection identification information (CID) serving as a link layer address in the IEEE 802.16 network, based on the extracted range information and the extracted multicast group identification information.

IEEE 802.16, IPv6, Multicast Address, Multicast Connection Identification (CID), Range Information, Group Identification Information

Description

Multicast Address Translation / Inverse Translation Method and Packet Forwarding Method Using Them {address mapping method between IPv6 multicast and IEEE802.16 connection identifier in wireless broadband access network}

1 is a configuration example of a portable Internet (WiBro) network to which the present invention is applied;

2 is an explanatory diagram showing a standardized IPv6 multicast address format;

3 is a diagram illustrating an embodiment of a multicast address translation method according to the present invention;

4 is a flowchart illustrating an embodiment of a multicast address translation / reverse translation method and a packet forwarding method using the same according to the present invention.

* Explanation of symbols on the main parts of the drawing

11: mobile terminal (PSS) 12: base station (RAS)

13 control station (ACR)

The present invention relates to a multicast address translation / reverse translation method and a packet forwarding method using the same in a portable Internet network, and more particularly, to a multicast address (IPv6 multicast address) of a network layer for forwarding IPv6 packets in an IEEE 802.16 network. The present invention relates to a method of converting a link identifier into a connection identifier (CID) [IEEE 802.16 multicast CID] serving as an address of a link layer, and an inverse transform method thereof, and a packet forwarding method using the same.

The Internet, which is driving the rapid wave of informatization of the society, is expanding to almost unlimited use, and even the telephone service for existing voice communication is being changed based on the Internet. One of the biggest problems in the widespread use of the Internet is the lack of IP (Internet Protocol) addresses.

The application of the Internet to various diverse fields such as the rapidly increasing Internet users and the ubiquitous sensor network (USN) requires such a large number of IP addresses, especially when using the Internet for voice and video communication. The lack of IP address has been recognized as a serious obstacle for society to move toward the information age because it requires a unique IP address rather than private IP using Network Address Translation (NAT).

The current wireless Internet environment is represented by WiBro service based on Wireless LAN (WiFi) based on IEEE 802.11 standard or Mobile WiMax (IEEE 802.16e). As wireless Internet services are becoming more popular after wired Internet, the existing IPv4 address is gradually being exhausted due to the increase in usage, and in the long term, the transition to the next generation Internet standard, IPv6 (Internet Protocol Version 6, IETF RFC4291). It is expected to be essential.

To address address depletion, the IETF has standardized IPv6 as a new addressing system for the next generation of the Internet, and the introduction of it is becoming more common.

IPv6, the address system of the next generation Internet, does not simply increase the number of usable IP addresses but includes new technologies such as automatic address setting and simplified option header, which solve the problems of the Internet which was difficult to solve in the existing IPv4 system .

However, an IEEE 802.16 network can configure a network in a point-to-multipoint method and a mesh method, and can provide a communication service using IPv4 or IPv6 packets. In particular, in order to provide a new service by configuring a large number of terminals as a network in device-to-device communication such as a wireless web camera and a sensor network, the introduction of IPv6 technology is essential.

However, until now, a mobile subscriber station (PSS: Portable Subscriber Station) and a base station (RAS: Radio Access Station) constituting an IEEE 802.16 network have provided communication services using IPv4.

In the IEEE 802.16 network, a point-to-multipoint method is used. The data transmitted from the terminal (PSS) to the base station (RAS) is transferred using the Layer 2 unicast method, and the data sent from the base station (RAS) to the terminal (PSS) is broadcast. Deliver differently depending on the usage by cast or unicast method.

IPv6 technology is designed based on wired broadcast based network environment. In the IEEE 802.3 network, a method of identifying and sending an IPv6 multicast packet to a link layer address is defined as a standard. IPv6 multicast addresses are defined in standards as shown in FIG.

In the point-to-multipoint scheme of the IEEE 802.16 network, a terminal (PSS) is possible through a base station (RAS) to broadcast or multicast to another terminal (PSS) in the same base station (RAS).

Specifically, in the point-to-multipoint scheme of the IEEE 802.16 network, the terminal PSS may communicate only with the base station RAS. Accordingly, the terminal PSS transmits information to the base station RAS in the form of Layer 2 unicast, and the base station RAS may deliver information to the terminal PSS in the form of unicast or multicast. In case of using the IEEE 802.16 point-to-multipoint scheme, Layer 3 multicast, which requires packets to be delivered to terminals (PSS) on the same link, such as Neighbor Solicitation (NS), is performed by the base station in the form of Layer 2 unicast. Because it is only transmitted to RAS, Duplicated Address Detection (DAD) does not work due to the wireless section communication characteristics of the IEEE 802.16 point-to-multipoint scheme.

That is, in the case of automatic IPv6 address setting, the terminal PSS generates an NS packet and delivers it directly to the terminals PSS on the same link, thereby checking whether the generated address is being used by another terminal PSS. do. However, in the point-to-multipoint scheme of the IEEE 802.16 network, the terminal PSS is physically connected only with the base station RAS because only the communication from the terminal PSS to the base station RAS is allowed. Therefore, even if another terminal (PSS) attached to the base station (RAS) is using the generated address, if the base station (RAS) does not perform special processing, the NS will not be delivered to the terminal (PSS) and the address is duplicated. (DAD) cannot be checked, and IPv6 address autoconfiguration cannot be performed.

The conventional method for solving this problem provides a proxy function of processing multicast on behalf of a terminal PSS at a base station (RAS) or a control station (ACR). However, this proxy function has the following problems.

Information necessary for the address duplication check (DAD) used in the automatic IPv6 address setting method should be managed by the proxy of the base station (RAS) or the control station (ACR). In addition, since all functions required by the terminal PSS, such as multicast subscription and withdrawal of the IP layer, are performed in the proxy, a control message for processing the multicast subscription and withdrawal of the terminal PSS is further defined. There is a problem that should be. In addition, when the multicast control is performed at the proxy of the base station RAS or the control station ACR, processing inherent in the base station RAS or the control station ACR may be degraded.

In view of this, there is a need for a method for identifying a network layer's multicast address and sending it as link layer address information in an IEEE 802.16 network.

SUMMARY OF THE INVENTION The present invention has been proposed to meet the above-mentioned requirements. It is an object of the present invention to provide a method for converting into an identification information (CID) serving as an address (IEEE 802.16 multicast CID), a reverse conversion method thereof, and a packet forwarding method using the same.

Other objects and advantages of the present invention can be understood by the following description, and will be more clearly understood by the embodiments of the present invention. It will also be readily apparent that the objects and advantages of the invention may be realized and attained by means of the instrumentalities and combinations particularly pointed out in the appended claims.

According to an aspect of the present invention, there is provided a method of translating a multicast address in a portable Internet network (IEEE 802.16 network), the method comprising: determining whether a packet to be transmitted is an IPv6 packet; Identifying a multicast address of a network layer for forwarding the IPv6 packet, and extracting range information and multicast group identification information from the identified multicast address; And configuring multicast connection identification information (CID) serving as a link layer address in the IEEE 802.16 network, based on the extracted range information and the extracted multicast group identification information.

Meanwhile, the present invention provides a method of delivering a packet in a portable Internet network (IEEE 802.16 network), the method comprising: determining whether a packet to be transmitted is an IPv6 packet; Identifying a multicast address of a network layer for forwarding the IPv6 packet, and extracting range information and multicast group identification information from the identified multicast address; Configuring multicast connection identification information (CID) serving as a link layer address in the IEEE 802.16 network, based on the extracted range information and the extracted multicast group identification information; And transmitting an IEEE 802.16 Medium Access Control (MAC) frame to a lower layer by using the configured multicast connection identification information.

In order to achieve the above object, the present invention provides a method for reverse translation into a multicast address in a portable Internet network (IEEE 802.16 network), the method comprising: receiving a multicast connection identification information (CID) of a received IEEE 802.16 Medium Access Control (MAC) frame Confirming; Extracting range information and multicast group identification information from the identified multicast connection identification information (CID); And configuring a multicast address of a network layer for delivering an IPv6 packet based on the extracted range information and the extracted multicast group identification information.

Meanwhile, the present invention provides a method for delivering a packet in a portable Internet network (IEEE 802.16 network), the method comprising: checking a multicast connection identification information (CID) of a received IEEE 802.16 Medium Access Control (MAC) frame; Extracting range information and multicast group identification information from the identified multicast connection identification information (CID); Configuring a multicast address of a network layer for delivering an IPv6 packet based on the extracted range information and the extracted multicast group identification information; And forwarding an IPv6 packet to a higher layer using the configured multicast address.

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The above objects, features and advantages will become more apparent from the following detailed description taken in conjunction with the accompanying drawings, whereby those skilled in the art may easily implement the technical idea of the present invention. There will be. In the following description, well-known functions or constructions are not described in detail since they would obscure the invention in unnecessary detail. Hereinafter, a preferred embodiment of the present invention will be described in detail with reference to the accompanying drawings.

The present invention provides link identification information (CID) serving as an address of a link layer to identify a network layer multicast address (IPv6 multicast address) for transporting IPv6 packets in an IEEE 802.16 network. Connection identification information (CID)] and the IEEE 802.16 MAC frame transmitted from the transmitter (terminal or base station) using the IEEE 802.16 multicast connection identification information (IEEE 802.16 MAC frame connection identification information) A method (first conversion method), a method for reconfiguring an IPv6 multicast address from IEEE 802.16 multicast connection identification information (CID) (inverse translation method), and an IPv6 at a receiver (device or control station) using an IPv6 multicast address. It is divided into a method of generating a packet and delivering it to a higher layer (second delivery method).

In the conversion and the first transmission method, the IPv6 multicast address information is converted and transmitted to the connection identification information (CID) serving as the link layer address in the IEEE 802.16 network, wherein the transmitter (terminal or base station / control station) is IPv6. IEEE 802.16 multicast connection identification information (CID) is configured from the scope of the multicast address and the multicast group ID, and the IEEE 802.16 medium access control (MAC) frame is received by the receiver (base station / control). Station or terminal).

In particular, the conversion method is a transmission module of a terminal or a base station / control station so that an IPv6 multicast address of a network layer for transmitting IPv6 packets in an IEEE 802.16 network can be identified (transmitted through the link layer) at the link layer. It is determined whether the packet to be transmitted is IPv6, and when using an IPv6 multicast address, it extracts the scope information and the multicast group ID from the IPv6 multicast address to identify the IEEE 802.16 multicast connection. Convert to information (CID).

The inverse transform and the second forwarding method may include IPv6 multicast scope information and multicast group identification information from IEEE 802.16 multicast connection identification information (CID) serving as a link layer address in an IEEE 802.16 network. Extracts the IPv6 multicast address from the receiver (base station / control station or terminal) and delivers the IPv6 packet to the upper layer.

As such, in an IEEE 802.16 network, a transmitter (terminal or base station / control station) generates IEEE 802.16 multicast connection identification information (CID) using an IPv6 multicast address, and at a receiver (base station / control station or terminal), IEEE 802.16 multi Creates an IPv6 multicast address using Cast Connection Identification (CID).

1 is a diagram illustrating a configuration of a WiBro network to which the present invention is applied.

As shown in FIG. 1, a typical WiBro network includes a mobile subscriber station (PSS) 11 that provides a service through a wireless connection with a base station (RAS) 12. A base station (RAS) 12 that connects a wireless connection with a mobile terminal (PSS) 11 to an Internet Protocol (IP) network, and an access control router (ACR) 13 for IP access and mobility management. Etc.

Typically, in a WiBro (IEEE 802.16) network, a base station (RAS) 12 provides a physical wireless access function to a WiBro wireless Internet terminal, i.e., a mobile terminal (MN) 11, and a control station (ACR) 13 ) Is responsible for higher layers such as routing.

When the packet is delivered to the mobile terminal (PSS) 11 from the outside of the wireless access network, the packet is delivered to the base station devices (BS) 12 and 13 through an access router (AR) 14 and the base station device (BS). (12, 13) forwards the packet to the mobile terminal (PSS) (11).

In the above description, the base station (RAS) 12 and the control station (ACR) 13 may be integrated into one device and may be implemented separately.

The IPv6 multicast address (see Figure 2) used in the present invention identifies several interfaces. Using the appropriate multicast routing topology, packets forwarded to a multicast address are forwarded to all interfaces identified by the address.

The FP (Format Prefix) of the IPv6 multicast address is 'FF (1111 1111)'. IPv6 addresses always begin with 'FF', and 'FF' indicates that the address is an IPv6 multicast address.

In addition to the FP, the IPv6 multicast address includes flag information, scope information, and multicast group identifier for identifying a multicast group.

The Flags field indicates a flag set in an IPv6 multicast address. The size of this field is 4 bits. Of these, the upper 3 bits are reserved, so 0 is assigned. However, the flag defined in the current RFC 2373 is a T (temporary) flag, and the T flag uses the lower bits of the flag field. The T flag set to '0' indicates that the IPv6 multicast address is a well known multicast address permanently assigned by the Internet Assigned Nembers Authority (IANA), and the T flag set to '1' indicates that the multicast address is not permanently assigned. Indicates a temporary (temporary assignment) multicast address.

Also, the Scope field is a 4-bit field used to limit the scope of the multicast group (the scope of the IPv6 internetwork to which the multicast traffic will be delivered). For example, a value of '1' indicates a node local multicast group, and a value of '2' indicates that the range is link local.

In addition, the Multicast Group ID field identifies the multicast group and is unique within the range The size of this field is 112 bits The permanently assigned group ID is not related to the range, Temporary group IDs are only relevant for a specific range: Multicast addresses from FF01 :: to FF0F :: are well-known reserved addresses.

FIG. 3 is an exemplary explanatory diagram illustrating a multicast address translation method according to the present invention, which converts a 128-bit IPv6 multicast address defined in FIG. 2 into 16-bit connection identification information (CID) of an IEEE 802.16 network. The method is shown.

As shown in Fig. 3, IEEE 802.16 multi serving as the link layer address to identify (transfer through the link layer) the IPv6 multicast address of the network layer for forwarding IPv6 packets in the IEEE 802.16 network (through the link layer). To convert to Cast Connection Identification Information (CID), the Scope and Multicast Group ID are extracted from the IPv6 multicast address of FIG. 2 and converted into IEEE 802.16 Multicast Connection Identification Information (CID). To convert.

At this time, the 16-bit IEEE 802.16 multicast connection identification information (CID) is 8-bit FE (11111110) used for multicast purposes, and 4-bit range information constituting an IPv6 multicast address (128 bits). ), And the lower 4 bits of the 112-bit Multicast Group ID (Multicast Group ID) constituting the IPv6 multicast address (128 bits) [8 bits + 4 bits + 4 bits]. Here, 'FE 1111110' indicates IEEE 802.16 multicast connection identification information (CID).

Although not shown in the figure, in order to reverse the conversion from IEEE 802.16 multicast connection identification information (CID) to an IPv6 multicast address, the IEEE 802.16 multicast connection identification information (CID) serving as the link layer address in the IEEE 802.16 network is used. The IPv6 multicast address is reconstructed by extracting IPv6 multicast scope information and multicast group ID information.

At this time, the 128-bit IPv6 multicast address includes an 8-bit FF 1111111 indicating that the IPv6 multicast address is an IPv6 multicast address, and 4-bit range information Scope constituting the IEEE 802.16 multicast connection identification information (CID). Four bits of flag information (Flag) allocated as '0' and four bits of multicast group ID constituting the IEEE 802.16 multicast connection identification information (CID) are the lower bits, and the remaining bits are all It consists of 112 bits of Multicast Group ID allocated to '0' [8 bits + 4 bits + 4 bits + 112 bits]. In this case, 'FF 1111111' indicates that the corresponding address is an IPv6 multicast address, and flag information Flags indicates a flag set to the IPv6 multicast address.

4 is a flowchart illustrating an embodiment of a multicast address translation / reverse translation method and a packet forwarding method using the same according to the present invention.

First, the transmission module of the mobile communication terminal (PSS) 11 or the base station apparatus (BS) 12, 13 determines whether the packet to be transmitted is an IPv6 packet (401). At this time, if it is not an IPv6 packet, it is processed as an IPv4 packet. IPv4 packet processing scheme will be discussed in the present invention.

As a result of the determination (401), it is checked whether the IPv6 packet is transmitted by multicast (403), and if it is transmitted by unicast, the IEEE 802.16 transport connection identification information (CID) is configured to configure the base station apparatus (BS) 12, 13 or the receiving module of the mobile communication terminal (PSS) 11 (404).

However, if the IPv6 packet is transmitted to the multicast address (403), the IPv6 multicast address is converted into connection identification information (CID) serving as an address of the link layer in the IEEE 802.16 network and transmitted (407).

At this time, the mobile communication terminal (PSS) 11 or the base station apparatus (IPS) 11 or the base station apparatus may be configured to identify (transfer through the link layer) the IPv6 multicast address of the network layer for transmitting IPv6 packets in the IEEE 802.16 network. The transmitting module of BS (12) and (13) extracts Scope and Multicast Group ID from the IPv6 multicast address (405, 406) and converts it into IEEE 802.16 Multicast Connection Identification (CID). (407). That is, the lower 4 bits of the 4-bit Scope and 112-bit Multicast Group ID constituting the 128-bit IPv6 multicast address are extracted (405, 405) and used for multicast purposes. 16-bit IEEE 802.16 multicast connection identification information (CID) together with 8-bit FE (1111110) is used. [Information used for 8-bit multicast use + 4-bit range information + 4-bit multi Cast group identification].

Thereafter, the IEEE 802.16 MAC frame is transmitted to the receiving module of the base station apparatus (BS) 12, 13 or the mobile communication terminal (PSS) 11 using the IEEE 802.16 multicast connection identification information (CID). Sublayer].

Then, the receiving module of the base station apparatus (BS) 12, 13 or the mobile communication terminal (PSS) 11 is connected to the transmitting module of the mobile communication terminal (PSS) 11 or the base station apparatus (BS) 12,13. If the connection identification information (CID) of the transmitted IEEE 802.16 MAC frame is checked (408) and the connection identification information (CID) does not start with 'FE (1111110)' (in step "404", the IEEE 802.16 transport connection identification is performed. If information (CID) is transmitted), for example, a unicast CID, the IPv6 packet is processed using the IEEE 802.16 transport connection identification information (CID) (409).

As a result of the check 408, if the connection identification information (CID) starts with 'FF 1111111' (that is, the IEEE 802.16 multicast connection identification information (CID)), the base station apparatus (BS) 12, 13 B) The receiving module of the mobile communication terminal (PSS) 11 converts the scope information and the multicast group ID information to convert the IEEE 802.16 multicast connection identification information (CID) into an IPv6 multicast address. It extracts (410, 411), inversely converts to an IPv6 multicast address (412), and forwards it to an upper layer (413) (lower layer to upper layer).

At this time, in order to reconfigure the 128-bit IPv6 multicast address, the 4-bit scope information extracted from the IEEE 802.16 multicast connection identification information (CID) is used as it is, and the IEEE 802.16 multicast connection identification information (CID) is used. The 4-bit multicast group ID extracted from the sub-bit is assigned as the lower bit, and the remaining 108 bits are all assigned to '0' to form 112-bit multicast group ID. An 8-bit FF (1111111) indicating that it is an IPv6 multicast address and 4 bits of flag information (Flag) all assigned with '0' are added. Bit range information + 112 bit multicast group identification information].

In the above-described step 401, in which the transmission module of the mobile communication terminal (PSS) 11 or the base station apparatus (BS) 12, 13 determines an IPv6 packet, convergence of a registration message performed in the IEEE 802.16 network access step is performed. It is determined by using Convergence Sublayer (CS) information. That is, the Type 7 information of the registration message indicates an IPv4 packet when bit # 1 is 1 and an IPv6 packet when bit # 2 is 1. When creating a connection based on this information, if the CS type is '100' in the DSx message, it indicates an IPv4 packet and if it is '101', it indicates an IPv6 packet. Therefore, when the packet is not an IPv6 packet in step 401, the packet may be processed as an IPv4 packet according to the information of the registration message and the DSx message.

CS provides a kind of tunneling effect for transmitting IEEE 802.16 MAC frames in a radio section between a mobile station (PSS) 11 and a base station (RAS) 12, where the connection identification information (CID) It serves as an identifier.

Further, in the above, the process 403 in which the transmitting module of the mobile communication terminal (PSS) 11 or the base station apparatus (BS) 12, 13 determines the IPv6 multicast address is performed by using a 128-bit IPv6 multicast address. If the first 8 bits are FF prefix information starting with '11111111', then it is a multicast address. For reference, the IPv6 unicast address starts with '001', in which case the IEEE 802.16 Transport Connection Identification (CID) is used.

Further, in the above, the transmission module of the mobile communication terminal (PSS) 11 or the base station apparatus (BS) 12, 13 converts the 128-bit IPv6 multicast address into 16-bit IEEE 802.16 connection identification information (CID). To this end, the lower 4 bits of the scope information and the multicast group identification information are extracted from the IPv6 multicast address of FIG. 2 (405, 406) and converted into IEEE 802.16 multicast connection identification information (CID). (407). In this case, the 16-bit IEEE 802.16 connection identification information (CID) uses FEA0 to FEFE for multicast purposes. Therefore, IEEE 802.16 multicast connection identification information (CID) is composed of 8 bits with 'FE (11111110)', and uses the lower 4 bits of 4-bit Scope and Multicast Group ID. It generates as shown in Figure 3 (407).

The generated IEEE 802.16 multicast connection identification information (CID) is transmitted as a radio signal through an IEEE 802.16 MAC frame (407).

Subsequently, the receiving module of the base station apparatus (BS) 12, 13 or the mobile communication terminal (PSS) 11 is an IEEE 802.16 multi-layer in which connection identification information (CID) of an IEEE 802.16 MAC frame starts with 'FE 1111110'. In case of Cast Connection Identification Information (CID), 4-bit scope information and 4-bit multicast group identification information from IEEE 802.16 connection identification information (CID) to convert to 128-bit IPv6 multicast address. ID) is extracted (410, 411), and a 128-bit IPv6 multicast address as shown in FIG. 2 is generated (412). In this case, referring to the generated 128-bit IPv6 multicast address, the 8-bit prefix is set to 'FF 1111111', and the 4-bit flag information Flag is all assigned to '0'. In addition, the 4-bit range information (Scope) uses the information obtained in step "410", and the 112-bit multicast group identification information (Multicast Group ID) is the 4-bit multicast group obtained in step "411". Assign the identification information (Multicast Group ID) to the lower bits and assign the remaining 108 bits to '0'.

This 128-bit reconstructed IPv6 multicast address is used by the upper layer.

In the above, whether to use the IPv6 packet depends on the method used when establishing the connection in step "401".

Also, in the reception module of the base station apparatus (BS) 12, 13 or the mobile communication terminal (PSS) 11, when the connection identification information (CID) does not start with 'FE 111110' (408), that is, If it is cast connection identification information (CID), IEEE 802.16 transport connection identification information (CID) is used, and if it is another purpose CID, processing for that purpose is performed.

The method of the present invention as described above may be embodied as a program and stored in a computer-readable recording medium (such as a CD-ROM, a RAM, a ROM, a floppy disk, a hard disk, or a magneto-optical disk). Such a process can be easily carried out by those skilled in the art and will not be described in detail.

It will be apparent to those skilled in the art that various modifications and variations can be made in the present invention without departing from the spirit or scope of the invention. The present invention is not limited to the drawings.

As described above, the present invention has an effect of providing an address duplication check processed by a proxy of a base station or a control station by a standardized method.

In addition, the present invention has the effect of controlling IPv6 multicast subscription, withdrawal, etc., which is very difficult to process in a proxy of a base station or a control station.

Accordingly, the present invention has the advantage of providing a consistent method of controlling address auto-configuration, address duplication, multicast subscription, change, and withdrawal, which are based on providing a multicast function in an existing IPv6 network. .

In addition, the present invention has the advantage that it is possible to control the multicast without using a new control message required in the multicast method by the proxy in the IEEE 802.16 network.

Claims (13)

In the method of translating a multicast address in a portable Internet network (IEEE 802.16 network), A determination step of determining whether a packet to be transmitted is an IPv6 packet; Identifying a multicast address of a network layer for forwarding the IPv6 packet, and extracting range information and multicast group identification information from the identified multicast address; And Configuring multicast connection identification information (CID) serving as a link layer address in the IEEE 802.16 network based on the extracted range information and the extracted multicast group identification information; How to convert a multicast address in a mobile Internet network comprising a. The method of claim 1, The multicast address is, An 8-bit 'FF' indicating an IPv6 multicast address, 4-bit flag information, 4-bit scope information, and 112-bit multicast group ID information. How to convert multicast address in the Internet. The method of claim 2, The multicast connection identification information (CID), 8-bit 'FE' used for multicast purposes, the 4-bit scope information constituting the multicast address, and the 112-bit multicast group identification information (Multicast) constituting the multicast address. A method of translating a multicast address in a portable Internet network, including multicast group ID of lower 4 bits of Group ID). 4. The method according to any one of claims 1 to 3, In the determination step, And determining by using convergence sublayer information of a registration message performed in the process of accessing the IEEE 802.16 network. In a method for delivering a packet in a portable Internet network (IEEE 802.16 network), Determining whether a packet to be transmitted is an IPv6 packet; Identifying a multicast address of a network layer for forwarding the IPv6 packet, and extracting range information and multicast group identification information from the identified multicast address; Configuring multicast connection identification information (CID) serving as a link layer address in the IEEE 802.16 network, based on the extracted range information and the extracted multicast group identification information; And Transmitting an IEEE 802.16 medium access control (MAC) frame to a lower layer by using the configured multicast connection identification information; Packet delivery method in a mobile Internet network comprising a. 6. The method of claim 5, The multicast connection identification information (CID), 8-bit 'FE' used for multicast purposes, the 4-bit range for configuring the multicast address, and the 112-bit multicast group identification information for forming the multicast address. A packet forwarding method in a portable Internet network including multicast group ID information of the lower 4 bits. In the reverse conversion method to a multicast address in a portable Internet network (IEEE 802.16 network), Checking multicast connection identification information (CID) of the received IEEE 802.16 Medium Access Control (MAC) frame; Extracting range information and multicast group identification information from the identified multicast connection identification information (CID); And Configuring a multicast address of a network layer for delivering an IPv6 packet based on the extracted range information and the extracted multicast group identification information Inverting a multicast address in a mobile Internet network comprising a. The method of claim 7, wherein The multicast connection identification information (CID), Multicast address in a mobile Internet network, which includes an 8-bit 'FE' used for multicast purposes, the 4-bit Scope, and the 4-bit Multicast Group ID. How to invert to. 9. The method of claim 8, The multicast address is, An 8-bit 'FF' indicating an IPv6 multicast address, the 4-bit range information Scope constituting the multicast connection identification information (CID), and 4-bit flag information all assigned to '0' ( Flag) and a 112-bit multicast group in which the 4-bit Multicast Group ID constituting the multicast connection identification information (CID) is a lower bit and all remaining bits are all assigned to '0'. A method for inverse translation into a multicast address in a portable Internet network, including identification information (Multicast Group ID). In a method for delivering a packet in a portable Internet network (IEEE 802.16 network), Checking multicast connection identification information (CID) of the received IEEE 802.16 Medium Access Control (MAC) frame; Extracting range information and multicast group identification information from the identified multicast connection identification information (CID); Configuring a multicast address of a network layer for delivering an IPv6 packet based on the extracted range information and the extracted multicast group identification information; And Forwarding an IPv6 packet to a higher layer using the configured multicast address Packet delivery method in a mobile Internet network comprising a. 11. The method of claim 10, The multicast address is, An 8-bit 'FF' indicating an IPv6 multicast address, the 4-bit range information Scope constituting the multicast connection identification information (CID), and 4-bit flag information all assigned to '0' ( Flag) and a 112-bit multicast group in which the 4-bit Multicast Group ID constituting the multicast connection identification information (CID) is a lower bit and all remaining bits are all assigned to '0'. Packet delivery method in a portable Internet network, including identification information (Multicast Group ID). delete delete

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