KR101110307B1 - Internet system supporting built-in mobility - Google Patents

Abstract

The present invention relates to a built-in mobility Internet system, which includes a user device, an access router supporting communication with each user device, and a core router supporting communication between each access router. A transport network that transmits and receives data between devices, a local mobility agent installed in an access router to manage location information of some user devices in the network, and a mobility device that communicates with each local mobility agent and manages location information for all user devices. It includes a control server, and is separated from the transmission network consists of a control network for controlling the communication between the user equipment using the location information of the user equipment. Accordingly, mobility may be provided in the basic structure of the system without requiring a protocol for supporting mobility as in the current Internet.

UE, EAR, ECR, LMA, MCS, NNP, UNP, UID, LID, AID

Description

Internet system supporting built-in mobility

The present invention relates to a mobility-providing Internet system, and more particularly, mobility can be supported under a basic structure through communication based on identifier (ID) and separation of a transport plane and a control plane. It is about a new internet system.

The present invention is derived from the research conducted as part of the IT growth engine technology development of the Ministry of Knowledge Economy and the Ministry of Information and Telecommunication Research and Development. [Task management number: 2006-S-061-03, Task name: IPv6 based QoS service and terminal mobility] Support router technology development].

1 is a block diagram of a conventional Internet mobility control system.

The conventional Internet mobility control system includes a mobile node (MN) 5, a counterpart node (CN: Correspondent Node) 35, a home agent (HA) 30, and a foreign agent (FA) Agent 20, the home agent 30 or the agent 20 is installed in the router (10).

The counterpart node 35 may be a mobile or fixed node, and refers to a node that transmits and receives data with the mobile node 5.

The home agent 30 is responsible for mobility support for the user in the home network of the mobile node 5, and the forest agent 20 is responsible for mobility support for the user in a network other than the home network.

When the mobile node 5 moves out of its home network and moves to another network, the mobile node 5 registers its location with the home agent 30 by using a foreign agent located in another network. At this time, the position of the mobile node 5 may be a newly assigned IP address from another network or an address of a forest agent managing another network. In this state, when the counterpart node 35 wants to send a packet to the mobile node 5, the counterpart node 35 does not recognize the movement of the mobile node 5, and thus, the counterpart node 35 is sent to the home network of the mobile node 5. Deliver the packet. Then, the home agent 30 receives the packet transmitted to the mobile node 5 and forwards the packet using the current position of the mobile node 5 obtained through the registration procedure of the mobile node 5. Accordingly, the counterpart node 35 can always communicate with the mobile node 5 regardless of whether or not the mobile node 5 moves.

2 is a structure of a protocol stack used in the Internet mobility control system of FIG.

The most representative mobility control protocol in the existing Internet base is Mobile IP. The Mobile IP protocol stack is located in the IP layer of the Internet protocol stack and includes a home agent 30 and a forest agent 20 that support mobility for the mobile node 5 or mobile node 5 that needs mobility support. As implemented in, it performs mobility support function for the mobile node 5. Accordingly, in the existing Internet mobility control system, an IP layer is formed in the protocol stacks of the mobile node 5, the router ER installed with the forest agent 20, the router, the router provided with the home agent, and the counterpart node. .

By the way, although Mobile IP is the most representative technology adopted to support mobility in the existing Internet, it is designed under the existing Internet design concept. Therefore, it is supported in the form of a patch-on on the existing Internet basically supporting a fixed terminal has a number of problems accordingly.

For example, the packet routing between the mobile node 5 and the counterpart node CN is basically in the form of triangular routing, and a plurality of encapsulation / de at each node due to tunneling for packet transmission. -Capsulation overhead is invented and has a problem such that a number of proxy functions are required for compatibility with the current Internet to support a mobile environment that is not considered in the existing Internet. The problem of the existing Internet has a limitation that it is difficult to satisfy the main conditions of the mobile environment required in the future Internet environment.

An object of the present invention is to provide an Internet system suitable for a future mobile environment through the identification-based communication and the separation of the transmission network and the control network.

The Internet system of the present invention according to the above object comprises at least one user device for transmitting and receiving data through a transmission network; At least one access router supporting communication of the user device through the transmission network; A core router supporting communication between the access routers through the transport network; The user network is managed by using an identifier for the user device through a control network separated from the transmission network and signaling for data transmission in the transmission network, and is provided for identification of the user device among the identifiers. A mobility control server controlling data to be transmitted between the user devices using a user identifier UID not including location information; And a local mobility agent communicating with the mobility control server through the control network and managing location information for the user device.

The mobility control server uses an identifier for the user device through signaling with a local mobility agent (LMA) including location information about the user device in a control network separate from a transmission network for data transmission between user devices. The data transmission and reception between the user device is controlled in the control network.

The Internet system according to the present invention transmits a packet to a user device using a user identifier (UID), thereby eliminating the need for a locator assignment such as an IP address for the user device, and accessing the protocol in the access network, especially the terminal. Simplify stack configuration, provide easy network access for users, and protocol separation between access network and core network allows easy evolution to the future Internet, ensures user location privacy, and moves to separation of delivery and control layers Efficient packet delivery is possible for the environment.

Hereinafter, the present invention will be described with reference to the drawings.

3 is a block diagram of the Internet mobility control system according to the present invention.

The present Internet system includes a user equipment (UE) 105 which is a user device, an enhanced access router (EAR) 110 which is an enhanced access router located at an end of the Internet, and an enhanced core router located in a core network of an internet mobility control system. ECR (Enhanced Core Router) 120, Local Mobility Agent (LMA) (150) located in the EAR (110), Mobility Control Server (MCS: Mobility Control Server) (160) located in the core network do.

In addition, the present Internet system is divided into a control network for signaling processing and a transmission network for data transmission.

In such an Internet system, a control network is formed between the LMA 150 and the MCS 160 and between the LMA 150 and the LMA 150, and all signaling for packet transmission is performed through the control network.

In addition, in the Internet system, the UE 105, the EAR 110, and the ECR 120 are interconnected through a transmission network to perform data transmission through the transmission network.

The UE 105 performs a function of requesting transmission of information to be transmitted by a user based on an identifier of a user or a terminal. Compared to the current Internet, which communicates based on IP addresses that simultaneously perform both identifier and locator functions, it simplifies the protocol stack of the user's device, enables the user to easily access the network, and does not include the locator. Has guaranteed features.

The EAR 110 supports transmission and reception of data between the UEs 105 through the core network, and processes all signaling for packet transmission for the mobile user on behalf of the user.

Therefore, there is no need for the user or the UE 105 to participate in mobility control, and the structure in which the EAR 110 controls mobility not only satisfies the network-based mobility control requirements currently required, but also the user. It provides easy access to the Internet, and naturally solves the location privacy problem, one of the key requirements of future Internet mobility control systems.

That is, even if the UE performs simple communication based on the identifier, the above function can be performed by the EAR processing a large part of the current UE. At this time, the location privacy problem is possible because the user or the UE 105 does not include the location information containing its location information in the packet transmission.

The LMA 150 is implemented at the end for signaling for packet transmission as an element of a control network corresponding to the EAR 110 of the transmission network. The LMA can then be implemented with or separately from the EAR, which depends on the implementation. The LMA 150 plays a role similar to that of a VLR (Visited Location Register) of a cellular system and includes a database that is responsible for managing location information related to one or more UEs 105.

The ECR 120 is an enhanced core router and communicates with the EAR 110 or another ECR 120 in the core network and is used for efficient packet delivery in the core network. Unlike the EAR, the ECR 120 may use the IP protocol for efficient packet delivery, but a new protocol according to the Internet system may be used. This has the advantage of providing a natural evolutionary path for the future Internet, which may not be compatible with the current Internet.

The MCS 160 plays a central role of signaling for packet transmission, and is implemented in the core network to communicate with the LMA 150. The MCS 160 manages location information, service profiles, etc. for all UEs 105, similarly to the function of the home location register (HLR) of all cellular systems. Accordingly, the MCS 160 is responsible for identifying and responding to the current location of the UE 105 when querying the location of the UE 105. The MCS may consist of multiple MCSs for load balancing, depending on the implementation.

As the Internet system separates the control network and the transmission network as described above, it is possible to establish a signaling and transmission system different from the existing Internet system, thereby enabling packet delivery with more reliability and flexibility.

Figure 4 is a table comparing the identifier of the Internet system proposed in the present invention and the identifier of the conventional Internet mobility control system.

As illustrated, three identifiers are used in the present Internet system: a user identifier (UID) as a user identifier, a location identifier (LID) as a location identifier, and an application identifier (AID) as an application identifier. In addition to the three identifiers, additional identifiers may be used later to improve special functions or existing functions.

UID is basically an identifier used to identify a user terminal or a user. The UID may correspond to a network access identifier (NAI), an e-mail address and an IP address, and an international mobile subscriber identity (IMSI) of a cellular system used in an existing Internet mobility control system. Although the UID may be formed in various formats, the present invention will be described assuming that the UID is basically formed in a NAI format.

LID is an identifier for identifying a location of a user terminal or a user in a network. The LID may correspond to an IP address used in an existing Internet mobility control system, a location area ID (LAI) and a cell ID (CID) used in a cellular system.

AID is an identifier used to identify a specific application used by a user. AID corresponds to the port number used in the existing Internet system.

By using such UID, LID, and AID, the present Internet system has a big difference in distinguishing a session from the existing Internet mobility control system. In the existing Internet mobility control system, an identifier used to distinguish end-to-end sessions has a form of [source IP address, source port number, destination IP address, destination port number]. In contrast, in the present Internet system, [source UID, source AID, UID of the transmitting UE 105, the AID of the transmitting UE 105, the UID of the receiving UE 105, and the AID of the receiving UE 105, destination UID, destination AID] type is used.

Comparing the types of these identifiers, the existing Internet mobility control system may include a source IP address, thereby exposing a user's location, thereby causing a user's location privacy problem. On the other hand, in the present Internet mobility control system, since only the UID including no location information is used, the location of the user is not exposed. Therefore, in the present Internet system, not only is the protocol stack of the access portion simple, but user location privacy does not occur.

5 is a conceptual diagram illustrating a signaling interface used in an internet system according to the present invention.

The signaling interface of the present Internet system includes an M _LM interface used between the MCS 160 and the LMA 150, an M _LL interface used between the LMA 150, and an M _UL interface used between the LMA 150 and the UE 105. It includes.

M _LM The interface is an interface between the LMA 150 and the MCS 160, and the M _LM Functions such as location registration and update, location query, etc. of the user mobile terminal are performed through the interface. M _LM The protocol of the interface may be a conventional IP protocol or an enhanced NNP (Network Network Protocol).

M _LL The interface is an interface between the LMA 150, M _LL Functions such as tunnel creation, bi-casting, and route optimization for handover may be performed on the interface. M _LL The protocol of the interface may use the existing IP protocol or the enhanced NNP protocol.

M _UL The interface is an interface between the UE 105 and the LMA 150, which is M _UL Through the interface, functions such as access, authentication, and charging of the user mobile terminal are performed. M _UL The protocol of the interface may be used UNP (User Network Protocol), UNP is newly defined in the present invention, will be described later.

6 is a configuration diagram of a protocol stack in a transmission network proposed by the present invention.

The transmission network includes a UE 105, an EAR 110, and an ECR 120. The protocol stacks used in the UE 105, the EAR 110, and the ECR 120 have different structures from each other. That is, in the present invention, the access network portion and the core network portion have a feature of having a different protocol stack.

The protocol stack of the UE 105 includes a link layer (L1 / L2), a UNP layer, and an application layer. Since the UE 105 does not perform signaling for packet transmission, it does not require a protocol stack for signaling and can be implemented much simpler than a conventional Internet system.

The protocol stack of the EAR 110 includes a first part for interfacing with the UE 105 and a second part for interfacing with a network. In this case, a new protocol may be used for packet transmission of the core network, but in the present embodiment, it is assumed that the existing IP is used. The first part consists of a link layer (L1 / L2) and the UNP layer, and the second part consists of a link layer and an IP layer. Here, as the protocol stack for the interface with the UE 105 consists of a link layer and a UNP layer, data transmitted and received between the UE 105 and the EAR 110 has a form including only the UNP header.

A new protocol may be used for packet transmission in the core network. However, in the present embodiment, it is assumed that the existing IP is used. Thus, the protocol stack of the ECR 120 has a link layer (L1 / L2) and an IP layer like the existing Internet. Is done. Therefore, since the protocol stacks of the EAR 110 and the ECR 120 both have an IP layer, packets transmitted and received between the EAR 110 and the ECR 120 have IP headers for packet forwarding to user data having an UNP header. It will have an added form.

7 is a diagram illustrating a protocol stack in a control network proposed by the present invention. In the present embodiment, the SCTP that is most typically used for signaling transmission is used as an example, but a new transmission protocol capable of efficient transmission of signaling information may be used instead of SCTP.

In the present control network, since the EAR 110 performs signaling for packet transmission on behalf of the UE 105, a protocol stack for signaling is implemented only on the LMA 150 and the MCS 160 constituting the control network.

The protocol stack of the LMA 150 is composed of a link layer (L1 / L2), an IP layer, an SCTP layer, and a Mobility Control Protocol (MCP) layer.

In the protocol of the LMA 150, signaling is performed using the MCP protocol, which is a new protocol in which IP packets are loaded on SCTP, which is a basic signaling transport layer protocol of a network. Since the detailed format of the MCP is irrelevant to the gist of the present invention, it will not be described in detail in the present invention. However, when SCTP is used, the MCP format basically follows the SCTP data chunk format.

The signaling packet generated by the LMA 150 has a form in which an SCTP header is formed in an MCP protocol message and an IP header is formed outside the SCTP header. The ECR 120 simply transmits the signaling packet while maintaining the IP packet form.

The MCS 160 protocol stack has a protocol stack having the same structure as that of the LMA 150, and processes a MCP message, which is a mobility-related protocol, to perform a mobility control function in the MCS 160.

As described above with reference to FIGS. 6 and 7, in the Internet system of the present invention, the protocol stack of the access portion is simplified compared to the conventional one, and newly defined, not the existing IP, between the UE 105 and the EAR 110. It is characteristic that UNP is used. This means that the UE 105 may no longer have a specific IP address, and user data is transmitted based on the UID. Using UID in this way can protect user location privacy and reduce the hassle of IP address assignment, which can bring many advantages in the structure of Internet system.

6 and 7 assume that the existing IP protocol is used, but in addition to the IP protocol mentioned above, other protocols applied to the wireless network may replace the IP layer described with reference to FIGS. 6 and 7. Of course you can.

8A is an example of a schematic format of a UNP packet generated at the UNP layer of the UE of FIG. 6.

The UNP packet is configured by combining UNP headers with user data, and the UNP header includes information for identifying the UNP packet. The UNP header consists of the sender user identifier, the sender application identifier, the receiver user identifier, and the receiver application identifier [source UID, source AID, destination UID, destination AID]. Various information can be included in the UNP header.

FIG. 8B is a schematic format of an NNP packet generated at the IP layer of the EAR of FIG. 6.

The NNP packet is configured in a form in which an IP header is combined with a UNP packet having a UNP header, and includes a source location identifier and a source location identifier [source LID, destination LID] to identify the NNP packet. In addition to the NNP header may include a variety of information for the control of the packet.

9A is a table showing the location database structure of the MCS of FIG. 4.

The location database of the MCS 160 includes an entry number, a UID, a LID, and a valid time. That is, for each entry, information about the UID and LID provided by the location registration and update procedure is mapped and stored. Here, the valid time represents the time when the information mapped to each entry is valid. When the user terminal is a wired terminal, the valid time is defined as infinity (INF). Therefore, if the location information returned from the MCS 160 has an infinite valid time when the LMA 150 queries the location, the LMA 150 recognizes the corresponding terminal as a wired terminal. In this case, since the location of the wired terminal is not changed, the LMA 150 immediately recognizes the wired terminal and immediately delivers the packet without a location query procedure when communicating with the corresponding terminal. This is because the structure of the Internet mobility control system proposed in the present invention basically regards the mobile terminal as the basic terminal and the wired terminal as an exception case requiring registration, which is considered in the future mobile mobility control system. Considering the network environment where the wireless environment is the main.

9B is a table showing the location database structure of the LMA of FIG. 4.

The location database of the LMA 150 manages mapping information between the UID and the LID for the local UE and the remote UE for each entry. Thus, the location database of the LMA 150 includes information about the entry number, local UE, remote UE, status, and valid time.

Here, the information about the local UE includes the UID and LID of the UEs, and is obtained from information provided from the MCS when querying the location of the local UEs managed by the LMA 150. On the other hand, the information on the remote UE is obtained by using a packet transmitted to the UEs managed by the LMA 150 and includes the UID and the LID of the remote UE. Each mapping information is managed separately into Ready and Active states according to the current state of the UE. Ready means that the UE is not currently communicating, the LMA 150 performs only location management for the UE. On the other hand, Active means that the UE is currently communicating, and the LMA 150 performs handover management together with location management for service continuity. The valid time of the information mapped to each entry means the valid time of each mapping information. If the mapping information for the packet to be transmitted exists within the valid time, the packet is delivered immediately without additional location query. This can significantly reduce the signaling added to the network. 10 is a message sequence chart illustrating an example of a process of registering and updating a location of a UE in an Internet system structure according to the present invention.

When the UE 105 is connected to the LMA 150 through a network access procedure (S1010), the LMA 150 registers the location of the UE 105 in the location database (S1020). Then, the LMA 150 transmits the UID of the user and the LID of the LMA 150 to the MCS 160 to register the location of the UE 105 in the MCS 160 (S1030). Then, the MCS 160 stores the LID and the UID for the corresponding UE 105 in the location database (S1040), and transmits an Ack message as confirmation of registration (S1050). Thereafter, when the UE 105 moves, the UE 105 performs a network access procedure again, and the LMA 150 performs a procedure of updating the location of the UE 105 through the same procedure as when registering a location. Then, the MCS 160 transmits a response message according to the location update of the UE 105.

11 is a message sequence chart showing a data transmission process between UEs managed by different LMAs.

In FIG. 11, the MUE 105B is a mobile terminal for receiving data, the CUE 105C is a counterpart mobile terminal for transmitting data, and the LMA-M 150b manages a MUE 105b. LMA, LMA-C 150a represents the LMA managing the CUE 105a.

First, in order to transfer data to the MUE 105b, the CUE 105a transmits a packet to the network using the UID of the MUE 105b (S1110). Then, the LMA-C 150a receives the packet from the CUE 105a and temporarily buffers the packet (S1120). At the same time, the LMA-C 150a extracts the information of the MCS 160 managing the MUE 105b using the UID of the MUE 105b, and the UID of the MUE 105b that is the destination to the MCS 160. Queries the location of the MUE (105b) by passing (S1130). The MCS 160 provides the LID, which is the location information of the LMA-M 150b in charge of the corresponding MUE 105b, with reference to the received UID (S1140). The LMA-C 150a that has determined the location of the MUE 105b stores the location information and the UID information of the MUE 105b in the location database (S1150), and transmits the buffered packet to the LMA-M 150b (S1160). ).

Receiving the packet, the LMA-M 150b stores the mapping information of the UID of the CUE 105a and the LMA-C 150a in the location database (S1170), and transmits the packet to the MUE 105b (S1180).

When transmitting and receiving such a packet, the LMA-C 150a of the transmitting side stores the UID and LID of the MUE 105b, and the LMA-M 150b of the receiving side stores the UID and LID of the CUE 105a to the counterpart, respectively. Store location information in a location database. Accordingly, when a packet is additionally transmitted from the CUE 105a to the MUE 105b, the packet may be delivered from the CUE 105a to the MUE 105b without additional location query. Similarly, even when the packet must be delivered from the MUE 105b to the CUE 105a, the packet can be delivered from the MUE 105b to the CUE 105a without additional location query. At this time, packet transmission between the MUE 105b and the CUE 105a can be performed only without a location query within an effective time. This is to reduce the signaling load of the entire network due to the location query at the UE.

Here, one of the other control functions of the mobility control method of the present embodiment corresponds to a handover. In the present embodiment, the handover is not described in detail, but the existing tunneling and bicasting methods may be used for the handover, and the handover may be more efficiently supported using the local cache proposed in the present invention.

The present invention does not require address allocation at the terminal because the user delivers the packet transmitted by the user using the user UID rather than the existing IP address, and enables easy access to the user's network and improves the location privacy of the user. And by introducing a new protocol UNP for the interface between the user and the network, it is possible to simplify the protocol in the access network, especially the terminal, resulting in ease of implementation and economics.

On the other hand, by separating the control network for transmitting the signaling for packet transmission and the transmission network for transmitting data, it is possible to efficiently send packets in a mobile environment. In addition, the access router which is a network element replaces most of the signaling for packet transmission, thereby reducing the burden on the terminal implementation and enabling network-based control required in the next-generation network environment.

On the other hand, by having a distributed mobility management structure such as a cellular network, such as the MCS (160) of the core network, the LMA (150) of the access stage, effective signaling is possible.

On the other hand, since the protocol between the access network and the core network is separated from each other, even if a new Internet protocol is used for an access network that is dependent on the mobile environment, the core network can use the current Internet protocol as it is, so it is not compatible with the current Internet. It is easy to evolve into the future Internet that may not.

In addition, the Internet system of the present invention uses a location database located in the LMA to enable communication between pre-registered UEs without additional location query within the valid time.

  Therefore, in the present invention, since all terminals are regarded as mobile terminals and require location registration and update as mandatory requirements, the signaling load that may occur may be significantly reduced.

In addition, by basically considering the terminal as a mobile terminal and by setting the wired terminal as an exception that requires registration, it provides an efficient mobility control method for future mobile and wireless network-oriented environment.

On the other hand, by considering the mobile terminal as a basic terminal, an additional signaling load is generated, but for the wired terminal separately managed using the effective time, and the signaling optimization method such as reuse of the mapping information in the local and remote LMA (150) The introduction can significantly reduce the signaling load on the network.

The present invention described above is not limited to the embodiments of the accompanying drawings and the detailed description, and it is understood that various substitutions, modifications, and changes can be made without departing from the technical spirit of the present invention. It will be apparent to those skilled in the art.

1 is a block diagram of a conventional Internet mobility control system,

2 is a structure of a protocol stack used in the Internet mobility control system of FIG.

3 is a block diagram of an Internet system according to the present invention;

4 is a table comparing the identifier of the Internet system according to the present invention and the identifier of the conventional Internet mobility control system,

5 is a conceptual diagram illustrating a signaling interface used in an internet system according to the present invention;

6 is a configuration diagram of a protocol stack in a transmission network according to the present invention;

7 is a diagram illustrating a protocol stack configuration in a control network of the present invention;

8A is a schematic format of a UNP packet generated at the UNP layer of the UE of FIG. 6, FIG.

8B is a schematic format of an NNP packet generated at the IP layer of the EAR of FIG. 6,

9A is a table showing the location database structure of the MCS of FIG. 4;

9b is a table showing the location database structure of the LMA of FIG. 4;

10 is a message sequence chart illustrating a process of registering and updating a location of a UE in an internet system according to the present invention;

11 is a message sequence chart showing a data transmission process between UEs managed by different LMAs.

Explanation of symbols on the main parts of the drawings

105: UE 110: EAR

120: ECR 150: LMA

160: MCS

Claims (13)

At least one user device for transmitting and receiving data through a transmission network; At least one access router supporting communication of the user device through the transmission network; A core router supporting communication between the access routers through the transport network; The user network is managed by using an identifier for the user device through a control network separated from the transmission network and signaling for data transmission in the transmission network, and is provided for identification of the user device among the identifiers. A mobility control server controlling data to be transmitted between the user devices using a user identifier UID not including location information; And And a local mobility agent communicating with the mobility control server through the control network and managing location information of the user device. The method of claim 1, The transmission network is formed between the user device, the access router and the core router, And the control network is formed between the local mobility agent and the mobility control server or the local mobility agent. The method of claim 1, And the mobility control server manages the user device using at least one identifier among the UID, the LID indicating the location of the user device, and the AID for identifying an application program of the user device.  The method of claim 1, And the mobility control server communicates with the local mobility agent through the control network using an IP protocol or a predetermined internet protocol. The method of claim 1, And the user device communicates with the local mobility agent using a user network protocol (UNP) based on a user or terminal identifier. The method of claim 1, And the user device comprises a protocol stack including a link layer, a UNP layer, and an application layer. The method of claim 2, The access router includes a first part used for communication with the user device, including a link layer and a UNP layer; A protocol stack configured as a second part used to communicate with the core router independently of the first part and including a link layer and a core network transport protocol (IP protocol) layer. Internet system characterized in that. The method of claim 2, The mobility control server and the local mobility agent Internet system, characterized in that consisting of a protocol stack including at least one layer of the link layer, network layer, transport layer and application layer. The method of claim 7, wherein The mobility control server communicates with the identifier of at least one of the UID, LID, and AID as information for identifying the UNP packet in a header of a UNP packet formed by the UNP layer. . The method of claim 9, The mobility control server includes a source user identifier (source UID), a source application identifier (source UID), a destination user identifier (destination UID), and a destination application identifier (destination AID) in a UNP header of the UNP packet. Internet system, characterized in that for communication. The method of claim 1, The mobility control server includes a location database for storing an entry number for each user device that forms an entry, information of a UID and LID mapped to the entry, and an effective time of the information mapped to the entry. Featuring an internet system. The method of claim 1, The local mobility agent may include an entry number for a connection between the user device or a connection between the user device and a remote user device not managed by the local mobility agent, a UID and LID of the user device, a UID and LID of the remote user device. And a location database for storing mapping information of an entry for a connection between the user device and the remote user, and information on a valid time of the mapping information. delete

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