KR102238521B1 - Partially distributed mobility management method dupporting grouop mobility of mobile router to which a plurality of terminals belong - Google Patents

Abstract

The present invention relates to a partially distributed mobility management method, comprising the steps of selecting any one of a plurality of terminals as a proxy terminal to act as a proxy for the disabled mobile router in preparation for the inability of a mobile router, the plurality of terminals The step of detecting the inability of the mobile router by any one of the terminals, the step of accessing the access router on behalf of the mobile router in which the proxy terminal is disabled, and the address of the mobile router in which the proxy terminal is disabled And resuming the interrupted communication service. Accordingly, the present invention can provide a more stable communication service.

Description

Partial distributed mobility management method supporting group mobility of mobile routers to which multiple terminals belong {PARTIALLY DISTRIBUTED MOBILITY MANAGEMENT METHOD DUPPORTING GROUOP MOBILITY OF MOBILE ROUTER TO WHICH A PLURALITY OF TERMINALS BELONG}

The present invention relates to a partially distributed mobility management method, and more particularly, to a partially distributed mobility management method capable of providing a more stable communication service in a partially distributed mobility network.

Recently, as the number of users using mobile devices rapidly increases, mobile mobility management has become an important function of smoothly supporting communication services in mobile networks.

Mobile device users who travel different distances and need to connect to different Internet services travel different distances through various means of transportation.

Therefore, host-based Mobile IPv6 (MIPv6) and network-based Proxy Mobile IPv6 (PMIPv6) protocols have been proposed to support mobility of mobile devices. MIPv6 is a host-based mobility management protocol proposed to support mobility of mobile devices, and provides global IP mobility in a simple and scalable manner.

1 is a conceptual diagram illustrating a host-based MIPv6 structure.

As shown in FIG. 1, MIPv6 is composed of a Home Agent (HA) supporting a home network, a Mobile Node (MN), and a Foreign Agent (FA) that delivers a packet to a network with a Mobile Node (MN).

HA is responsible for the mobility management of MNs in the domain, and the MN is assigned a global IP, Home of Address (HoA) from the HA. When the MN leaves the home network, the FA assigns a Care of Address (CoA) to the MN and updates the information to the HA. Thereafter, the HA manages the HoA and CoA of the MN, and all packets destined for the MN are transmitted from the HA to the MN through tunneling. However, in MIPv6, since the MN performs a signaling procedure related to mobility, a large burden may be placed on the terminal due to the implementation of complex standard specifications and an increase in power usage.

In order to overcome the shortcomings of MIPv6 as described above, the Internet Engineering Task Force (IETF) established the standard of PMIPv6, a network-based mobility management protocol, in order to reduce the burden on the MN and provide local mobility.

2 is a conceptual diagram illustrating a centralized PMIPv6 structure.

Centralized PMIPv6 is composed of Mobile Access Gateway (MAG) and Local Mobility Anchor (LMA).

The LMA manages the MN's ID and prefix information, and all traffic destined for the MN is transmitted to the MN through tunneling to the MAG to which the MN belongs through the LMA.

However, such a centralized structure has problems such as a traffic bottleneck for a single anchor, a routing path ratio optimization, a network scalability limitation, and a fatal problem to the entire network when a single anchor is unavailable.

Distributed Mobility Management (DMM) was proposed by the Internet Engineering Task Force (IETF) to solve the problems of the centralized protocol as described above.

Among various DMM techniques, two methods of PMIPv6-based distributed mobility management are discussed: Partially DMM (PDMM) and Fully DMM (FDMM). The distinction between PDMM and FDMM is the presence or absence of a centralized mobility database (CMD).

3 is a conceptual diagram for explaining a partially distributed mobility management structure.

PDMM consists of MAAR and CMD. In PDMM, the function of the data plane is distributed to the MAAR, and the function of the control plane is performed by the CMD.

CMD exchanges binding update messages with MAAR and manages MN's mobility information. MAAR allocates an IPv6 address to a terminal and plays the role of LMA and MAG of PMIPv6.

4 is a conceptual diagram for explaining a completely distributed mobility management structure.

FDMM is a distributed mobility management protocol based on PMIPv6 that performs operations using only MAAR without CMD. In FDMM, the MAAR is located at the edge of the network area as shown in FIG. 4 and performs both a data plane and a control plane function. In order to keep the service received by the MN, PDMM exchanges binding messages between CMD and MAAR, but FDMM exchanges messages between MAARs. In addition, since each MAAR of the FDMM knows only the information of the MN it has, there is a fatal disadvantage in that it has to find the information of the MAAR one by one. In addition, FDMM did not clearly define the method of exchanging binding messages between the old MAAR and the MAAR that newly provides the service in the recent IETF. Accordingly, the present invention proposes a group mobility management method using PDMM.

On the other hand, when multiple MNs handover to different mobility anchors and access routers (MAARs) in the DMM, it was confirmed that it is inefficient because message exchange rapidly increases in the handover procedure and loads the entire network.

To solve this problem, a group-based NEtwork that MOves (NEMO) protocol supporting network mobility was proposed by the IETF. In NEMO, even if the network moves, the MN can not only reduce energy consumption and complexity during operation, but also solve the problem of large data traffic. Thus, the terminal can continue to maintain an Internet connection without any influence on mobility. Accordingly, the present invention uses NEMO standardized by IETF in a partially distributed mobility management (PDMM) environment.

5 is a diagram for describing a conventional method for managing partial distributed mobility.

Referring to the drawing, in the partially distributed mobility management structure, a mobile terminal may generate an IP address by receiving a prefix from an initially accessed mobile anchor.

When the terminal moves to a different mobile anchor, a service is provided by creating an IP tunnel with a previous anchor (P_MR) and a new anchor (N_MR). However, at this time, if the previous anchor (P_MR) is disabled due to failure or destruction, information loss for the mobile terminal in the domain and the binding update procedure between CMDs cannot be performed. Therefore, communication service support for the terminal is also impossible.

In the prior art for solving this problem, when the previous mobile anchor (P_MR) becomes unavailable, the mobile terminal accesses the new mobile anchor. Thereafter, the new mobile anchor (N_MR) obtains information on the previous mobile anchor of the terminal from the CMD and sends a binding update message for handover of the terminal to the previous mobile anchor, but does not receive a response. After the timeout, the new mobile anchor (N_MR) recognizes that the previous mobile anchor (P_MR) is disabled, and all mobile anchors in the wholesaler to form a tunnel with the relay anchor (not shown) to which the counter terminal (CN) is connected. Send a broadcast message to the user. Thereafter, a tunnel is created through a binding update procedure between a new mobile anchor (N_MR) and a relay anchor (not shown) to which the counter terminal (CN) is connected, and the existing service for the terminal is resumed.

In the prior art, when information on the previous mobile router is obtained from the CMD and the new mobile router sends a binding update message to the previous mobile router and does not receive a response, the inability of the previous mobile router is identified. However, in the absence of a new mobile router, the terminal cannot maintain the existing service unless it is connected to the access router.

KR 10-1598109 B1

The technical problem to be solved by the present invention is to provide a partially distributed mobility management method capable of providing a more stable communication service by allowing a mobile terminal to act as a mobile router when a mobile router in a domain is disabled.

The partial distributed mobility management method according to an embodiment of the present invention for solving the above technical problem is a proxy terminal that will act as the disabled mobile router for any one of a plurality of terminals in preparation for the inability of the mobile router. Selecting to, the step of detecting the disability of the mobile router by any one of the plurality of terminals, the step of accessing the access router on behalf of the mobile router in which the proxy terminal is disabled, and the proxy terminal is disabled It may include resuming the interrupted communication service based on the address of the mobile router.

In addition, the step of selecting as the proxy terminal includes: the access router outputs a beacon signal, the terminal receiving the beacon signal transmits a beacon acknowledgment signal to the mobile router, and the mobile router confirms the beacon reception It may include the step of selecting the proxy terminal based on the signal.

In addition, the step of selecting the proxy terminal includes: the mobile router transmitting its own address and the address of the access router to the proxy terminal, and the mobile router broadcasts a binding message for notifying the address of the proxy terminal. It may further include transmitting to the plurality of terminals.

In addition, the step of detecting the disability of the mobile router is based on a first connection message periodically transmitted from the mobile router or a second connection message of the mobile router for connection confirmation signals periodically transmitted from the plurality of terminals. It may be to detect the inability of the mobile router.

In addition, the step of detecting the disability of the mobile router may include outputting an event message when communication with the counterpart terminal is disabled, and calculating the disability of the mobile router based on the event message. .

In addition, the step of accessing the access router may include transmitting a binding message for replacing the mobile router disabled by the proxy terminal in a broadcast manner, and the plurality of terminals transmit their IDs in response to the binding message. Transmitting to the proxy terminal, transmitting a connection request message for accessing the access router by the proxy terminal, and storing the address of the mobile router and the address of the proxy terminal in which the access router is disabled. Can include.

In addition, the step of resuming the communication service includes: transmitting, by the access router, a binding update request to a central management server, storing, by the central management server, change information of the mobile router based on the binding update request, the Transmitting, by the central management server, a binding message for transmission of communication traffic generated before the disabling of the mobile router to the proxy terminal, and the access by the proxy terminal based on the address of the disabled mobile router It may include the step of creating a traffic tunnel with a router.

In addition, the partial distributed mobility management method of the present invention may further include the step of releasing the traffic tunnel when the proxy terminal transmits all the generated communication traffic to the counterpart terminal before the mobile router is disabled. have.

The technical problem of the present invention is not limited to the above-described bar, and other technical problems can be inferred from the following examples.

The partially distributed mobility management method according to an embodiment of the present invention allows the mobile terminal to act as a mobile router when the mobile router in the domain is unavailable, thereby providing a more stable communication service without the need to search for a new mobile router. There is an advantage that there is..

In addition, the present invention can reduce latency and overhead related to mobility by removing the central anchor and bringing the network connection point closer to the mobile node by using the PDMM.

In addition, according to the present invention, by using a PDMM, inefficient use of a network due to traffic concentration and bottleneck can be reduced.

In addition, the present invention is a tactical information communication network (TICN) in which an upper unit and a lower unit communicate with each other via a mobile anchor, when the mobile anchor is disabled, the mobile node of any one lower unit is As it plays a role, more stable communication is possible even in urgent exhibition situations.

1 is a conceptual diagram for explaining the structure of MIPv6.
2 is a conceptual diagram illustrating a centralized PMIPv6 structure.
3 is a conceptual diagram for explaining a partially distributed mobility management structure.
4 is a conceptual diagram for explaining a completely distributed mobility management structure.
5 is a diagram for describing a conventional method for managing partial distributed mobility.
6 is a diagram for explaining a partially distributed mobility management system according to the description of the present invention.
7 is a flowchart illustrating a method for managing partial distributed mobility according to the description of the present invention.
8 is a signal flow diagram for explaining a method for selecting a proxy terminal according to the description of the present invention.
9 is a signal flow diagram illustrating a method of accessing an access router by an agent terminal according to the description of the present invention.
10 is a signal flow diagram illustrating a method of resuming a communication service according to the description of the present invention.

The terms used in the embodiments have selected general terms that are currently widely used as possible while considering functions in the present invention, but this may vary according to the intention or precedent of a technician working in the art, the emergence of new technologies, and the like. In addition, in certain cases, there are terms arbitrarily selected by the applicant, and in this case, the meaning of the terms will be described in detail in the description of the corresponding invention. Therefore, the terms used in the present invention should be defined based on the meaning of the term and the overall contents of the present invention, not a simple name of the term.

When a part of the specification is said to "include" a certain component, it means that other components may be further included rather than excluding other components unless specifically stated to the contrary. In addition, terms such as "?? unit" and "?? module" described in the specification mean a unit that processes at least one function or operation, which may be implemented as hardware or software, or as a combination of hardware and software. have.

In the following disclosure, a network prefix in IPv6 may be referred to as a prefix. In addition, the subnet ID and interface ID in IPv6 may be collectively referred to as ID. Also, the ipv6 address can be called an IP address.

In the following disclosure, disable of the mobile router may mean a state in which the mobile router cannot designate a transmission path of a packet due to destruction, failure, or failure of the mobile router.

In the following disclosure, the disabled mobile router may mean a mobile router in which the disabled is generated. Conversely, the normal mobile router may refer to a mobile router capable of specifying a transmission path of a packet before a failure occurs.

6 is a diagram for explaining a partially distributed mobility management system according to the description of the present invention.

Referring to the drawings, a partially distributed mobility management system according to an embodiment of the present invention includes a plurality of terminals 610, 620, 630, 640, hereinafter referred to as 600 when there is no need for classification), a mobile router 710, and access. A router 810, a central management server 910, and a counterpart terminal 650 may be included.

In addition, the partially distributed mobility management system includes a control plane and a data plane, and performs data packet processing in the control plane and a binding update message in the data plane. It can be used to manage the mobility information of the terminal.

The plurality of terminals 600 may be a first terminal 610, a second terminal 620, a third terminal 630, and a fourth terminal 640. Depending on the embodiment, the number of terminals 600 may be increased. In addition, in the present disclosure, the terminal 600 may be used interchangeably with a mobile node (MN) and a mobile terminal.

The plurality of terminals 600 may refer to a terminal capable of being moved as a terminal that performs packet data communication by receiving a mobile IP, but the present invention is not limited thereto.

Any one of the plurality of terminals 600 may act as an agent of the disabled mobile router 710 when the mobile router 710 is disabled. A mobile terminal that acts as a disabled mobile router may be referred to as an agent terminal 610.

The mobile router 710 may be assigned a home IP (HoA) from a home network (Mobile Network), and when moving to another mobile network, the mobile router 710 is assigned a temporary outsourced IP (CoA) from the mobile network. Network) can support network mobility of a plurality of terminals 600 in the.

The mobile router 710 may store information on a plurality of terminals 600 connected to the mobile router 710.

The access router 810 may allocate a home IP or a temporary entrusted IP to the mobile router 710, and designate a packet transmission path between the mobile router 710 and a counterpart terminal, ) And communication with the other terminal 650 may be enabled.

The central management server 910 may include a management table, and update information of the mobile router 710 and the plurality of terminals 600 to enable mobility of the mobile router 710 and/or the plurality of terminals 600. You can apply.

According to the above configuration, in a normal state, the plurality of terminals 600 can communicate with the counterpart terminal 650 through the mobile router 710 and the access router 810. However, when the mobile router 710 is disabled, since the data transmission path is blocked, the plurality of terminals 600 cannot communicate with the counterpart terminal 650.

Any one of the plurality of terminals 600 may detect the inability of the mobile router 710. For example, any one of the plurality of terminals 600 may detect the inability of the mobile router 710 through periodic message exchange with the mobile router 710. And/or any one of the plurality of terminals 600 may detect the inability of the mobile router 710 when a communication failure event occurs during communication with the counterpart terminal 650. 6 shows that the third terminal 630 detects the disability of the mobile router 710. The mobile terminal that detects the inability of the mobile router 710 may be referred to as a sensing terminal. The sensing terminal may notify the proxy terminal 610 of the inability of the mobile router 710.

When the mobile router 710 is disabled, the proxy terminal 610 may act on behalf of the mobile router 710. The proxy terminal 610 may act as a new mobile router 720 on behalf of the mobile router 710. The proxy terminal 610 may access the access router 810 on behalf of the disabled mobile router 710.

When the proxy terminal 610 operates as the new mobile router 720, the plurality of terminals 600 can communicate with the counterpart terminal 650 through the new mobile router 720 and the access router 810.

7 is a flowchart illustrating a method for managing partial distributed mobility according to the description of the present invention.

Referring to the drawing, the mobile router 710 may select an agent terminal 610 to act for its role in preparation for its inability (S710).

Since the proxy terminal 610 must access the access router 810 on behalf of the mobile router 710, the mobile router 710 is one of a plurality of terminals 600 included in the communication range of the access router 810. The terminal of can be selected as the proxy terminal 610. For example, the mobile router 710 may select the proxy terminal 610 based on a received signal strength indicator (RSSI) of a beacon signal received from the access router 810.

The sensing terminal 630 may detect the inability of the mobile router 710 (S720).

The sensing terminal 630 may detect the inability of the mobile router 710 based on whether or not the first connection message transmitted from the mobile router 710 is received.

For example, if the sensing terminal 630 does not receive a router advertisement message periodically transmitted from the mobile router 710 within a predetermined time, it may calculate that the mobile router 710 is disabled. The predetermined time may be appropriately set in consideration of the size of the buffer memory of the mobile router 710 and the relay router (not shown).

The detection terminal 630 may detect the inability of the mobile router 710 based on whether or not the mobile router 710 receives a second connection message for a connection confirmation signal that is periodically output.

For example, the detection terminal 630 uses a periodic, neighbor unreachability detection (NUD) using a neighbor advertisement (NA) and a neighbor solicitation (NS) message. 710) can be detected.

In a state in which the sensing terminal 630 communicates with the counterpart terminal 650, when the mobile router 710 is disabled, communication with the counterpart terminal 650 may be stopped. Accordingly, the sensing terminal 630 may output a communication failure event message when communication failure with the counterpart terminal 650 occurs. When receiving the communication failure event message, the proxy terminal 610 may calculate the communication failure of the mobile router 710.

On the other hand, the method of detecting the disability of the mobile router 710 through the above-described periodic message has the advantage of being able to quickly detect the disability of the mobile router 710, but since the group mobility network uses a wireless environment, The accuracy of the disabled detection may be reduced only by the detection method of the disabled mobile router through periodic messages. In addition, there is a problem that network traffic overload occurs when the message transmission/reception period is set to be short in order to improve accuracy and identification speed.

On the other hand, the method of detecting the disability of the mobile router 710 through the disability of communication described above has the advantage of reducing the overload problem of the system, but when there is no existing communication session or the terminal in the group is a new communication session If it is not requested, there is a possibility that the recovery operation may be delayed.

Accordingly, in the present invention, the disability through communication connectivity is used as a basic operation, but the load applied to the network is reduced by increasing the transmission period of the periodic identification message.

The proxy terminal 610 may access the access router 810 on behalf of the disabled mobile router 710 (S730).

The proxy terminal 610 may access the access router 810 and update information of the disabled mobile router 710 and its own information using an option field of a router advertisement (RA) message.

When there is an access request from the proxy terminal 610, the access router 810 updates the information of the mobile router 710 and the information of the proxy terminal 610 in the management table, and the proxy terminal 610 performs a new mobile router ( 720).

The proxy terminal 610 may resume the interrupted communication service based on the address of the disabled mobile router 710 (S740).

The access router 810 binds its own information to the information of the mobile router 710 and the information of the proxy terminal 610 received from the proxy terminal 610, and requests the central management server 910 to update the binding. (Proxy Binding Update: PBU) can be done.

The central management server 910 may update information of the mobile router 710, information of the proxy terminal 610, and the access router 810 in the management table. The central management server 910 may transmit a binding message to the proxy terminal 610 for transmission of existing communication traffic.

The proxy terminal 610 may create a traffic tunnel with the access router 810 based on information of the disabled mobile router 710.

The access router 810 may restore an existing communication session to the plurality of terminals 600 through a traffic tunnel to resume communication service. The access router 810 and/or the proxy terminal 610 may release the traffic tunnel when all of the existing communication is terminated.

8 is a signal flow diagram for explaining a method for selecting a proxy terminal according to the description of the present invention.

The selection method of the proxy terminal 610 performing the function of the disabled mobile router 710 should reflect the characteristics of the group mobility network. In particular, in the present invention, since the proxy terminal 610 has to replace the role of the disabled mobile router 710, the initial identifier of the disabled mobile router 710 can always replace the role of the proxy terminal 610. It is not.

The condition of the proxy terminal 610 must be able to perform the function of the disabled mobile router 710 and must be present in a location accessible to the access router 810. In particular, when there are a plurality of candidate proxy terminals that can be the proxy terminal 610, the optimal proxy terminal 610 should be selected for smooth communication.

In the present invention, when there are a plurality of candidate proxy terminals, the proxy terminal 610 may be selected based on the received signal strength (RSSI) of a beacon signal.

In more detail, the access router 810 may output a beacon signal (S810).

At least one of the plurality of terminals 600 may receive a beacon signal transmitted by the access router 810. The terminal receiving the beacon signal may be referred to as a candidate terminal. 8 illustrates that the second terminal 620 and the third terminal 630 are candidate terminals.

The terminal receiving the beacon signal may transmit a beacon confirmation signal to the mobile router 710 (S820).

The beacon confirmation signal may include received signal strength (RSSI) information of the beacon signal.

The mobile router 710 may select the proxy terminal 610 based on the beacon acknowledgment signal (S830).

The mobile router 710 may select the proxy terminal 610 based on the received signal strength (RSSI) of the beacon signal when there are a plurality of terminals that have received the beacon signal. The mobile router 710 may select a terminal having the largest received signal strength (RSSI) of the beacon signal as the proxy terminal 610. 8 illustrates that the second terminal 620 is selected as the proxy terminal 610.

The mobile router 710 may transmit its own address and the address of the access router 810 to the proxy terminal 610 through a router advertisement (RA) message using a flag (S840).

In addition, the mobile router 710 may transmit a binding message for notifying the address of the proxy terminal 610 to the plurality of terminals 600 in a broadcast manner (S850).

According to the present invention, by selecting the proxy terminal 610 based on the received signal strength (RSSI) of the beacon signal, it is possible to provide a more stable communication service.

9 is a signal flow diagram illustrating a method of accessing an access router by an agent terminal according to the description of the present invention.

Referring to the drawing, the detection terminal 630, which first identifies the inability of the mobile router 710, may transmit an inability detection signal to the proxy terminal 610 (S910).

Upon reception of the disability detection signal, the proxy terminal 610 may transmit a binding message informing that it replaces the disabled mobile router 710 in a broadcast manner to the UEs in the group (S920).

Terminals in the group may transmit their information to the proxy terminal 610 in response to the binding message (S930). The terminal information may include the terminal ID. The ID of the terminal is transmitted to the central management server 910 and may be used for calculating a Binding Cache Entry (BCE).

On the other hand, the access router 810 has lost connectivity with the disabled mobile router 710, but cannot determine the reasons for the mobile router 710's inability, temporary wireless communication failure, handover, etc. Can't do it. In addition, the access router 810 cannot delete the corresponding information from the partially distributed mobility control system, and must wait for reconnection of the terminal.

The proxy terminal 610 may transmit a connection request message for accessing the access router 810 to the access router 810 (S940).

The proxy terminal 610 may access the access router 810 and update the address of the disabled mobile router 710 and its own address using the option field of the router advertisement (RA) message (S950).

Upon receiving the address of the disabled mobile router 710 and the address of the proxy terminal 610, the access router 810 recognizes the inability of the mobile router 710, and the proxy terminal 610 becomes the new mobile router 720. It can be calculated as operating as.

10 is a signal flow diagram illustrating a method of resuming a communication service according to the description of the present invention.

Referring to the drawing, the access router 810 receiving the information of the proxy terminal 610 is information on the mobile router 710 disabled in the central management server 910, the information on the proxy terminal 610, and its own information. A binding update request including a may be transmitted (S1010).

The central management server 910 may update the change information of the mobile router 710 in the management table based on the update request (S1020).

The central management server 910 may transmit a binding response message (Proxy Binding Acknowledgment: PBA) to the access router 810 in response to the binding update request transmitted by the access router 810 (S1030).

The central management server 910 may transmit a binding message for transmitting the generated communication traffic to the agent terminal 610 before the mobile router 710 is disabled (S1040). Depending on the embodiment, S1030 and S1040 may be performed simultaneously.

The proxy terminal 610 may create a traffic tunnel of the access router 810 based on the address of the disabled mobile router 710 (S1050). In addition, the proxy terminal 610 may transmit a binding response message notifying the creation of a traffic tunnel to the central management server 910 (S1060).

The access router 810 may restore an existing communication session to terminals in the group through a traffic tunnel and resume communication service. The access router 810 may restore an existing communication session and transmit buffered data to terminals in the group.

Meanwhile, in order to reduce the complexity of the network, the present invention provides only the existing communication service through the traffic tunnel, and when a terminal in the group starts a new communication, the address of the proxy terminal 610 is used, regardless of the traffic tunnel. A communication service with the counterpart terminal 650 may be provided through routing.

In other words, when the proxy terminal 610 and/or the access router 810 transmits all the generated communication traffic to the counterpart terminal 650 before the mobile router 710 is disabled, the traffic tunnel may be released. have.

As described above, the present invention is suitable for an actual environment and efficiently resumes service for a terminal whose service has been interrupted due to the disability of the mobile router 710 in a partially distributed mobility management structure supporting group mobility. .

In particular, when the connection to a new mobile router, which is a limitation of the prior art that occurs when the characteristics of group mobility are considered, is difficult, there is a delay in connection, the new mobile router and the existing group have different mobility, etc. Overcoming the limitations of application in a mobile environment.

In addition, as described above, in the network mobility control structure, when the mobile router 710 performing the role of a gateway is disabled, the mobile group itself through the proxy terminal 610 acting as the mobile router 710 Communication recovery is possible.

Accordingly, real-time communication can be resumed regardless of the presence or absence of a new mobile router. In particular, in a tactical network environment, each group moves with separate mobility, and in an environment where the mobile router 710 is geographically separated and operated, connection with a new mobile router is impossible or an existing mobility must be abandoned. Regardless of environmental factors, there is an advantage that communication connection restoration operation is possible while supporting group mobility.

The embodiment according to the present invention described above may be implemented in the form of a computer program that can be executed through various components on a computer, and such a computer program may be recorded in a computer-readable medium. In this case, the medium is a magnetic medium such as a hard disk, a floppy disk, and a magnetic tape, an optical recording medium such as a CD-ROM and a DVD, a magnetic-optical medium such as a floptical disk, and a ROM. It may include a hardware device specially configured to store and execute program instructions, such as, RAM, flash memory, and the like.

Meanwhile, the computer program may be specially designed and configured for the present invention, or may be known and usable to a person skilled in the computer software field. Examples of computer programs may include not only machine language codes such as those produced by a compiler, but also high-level language codes that can be executed by a computer using an interpreter or the like.

Those of ordinary skill in the technical field related to the present embodiment will appreciate that it may be implemented in a modified form without departing from the essential characteristics of the above-described description. Therefore, the disclosed methods should be considered from an explanatory point of view rather than a limiting point of view. The scope of the present invention is shown in the claims rather than the foregoing description, and all differences within the scope equivalent thereto should be construed as being included in the present invention.

600: multiple terminals
610: proxy terminal
630: detection terminal
650: counterpart terminal
710: mobile router
810: access router
910: Central Management Server

Claims (8)

In the partially distributed mobility management method supporting group mobility of a mobile router to which a plurality of terminals belong,
In preparation for the inability of the mobile router, which means that the mobile router cannot designate a transmission path of a packet, selecting any one of the plurality of terminals as an agent terminal to act as an agent for the disabled mobile router step;
Detecting, by any one of the plurality of terminals, the inability of the mobile router;
Accessing an access router on behalf of the mobile router, which is disabled by the proxy terminal; And
Resuming the interrupted communication service based on the address of the mobile router in which the proxy terminal is disabled; Including,
The step of selecting as the proxy terminal
Outputting a beacon signal by the access router;
Transmitting, by the terminal receiving the beacon signal, a beacon reception confirmation signal to the mobile router; And
Including, the mobile router selecting the proxy terminal based on the beacon acknowledgment signal; Including,
The step of detecting the inability of the mobile router is
Partial distributed mobility management for detecting the inability of the mobile router based on a first connection message periodically transmitted from the mobile router or a second connection message of the mobile router for a connection confirmation signal periodically transmitted from the plurality of terminals Way. delete The method of claim 1,
The step of selecting as the proxy terminal
Transmitting, by the mobile router, its own address and the address of the access router to the proxy terminal; And
Transmitting, by the mobile router, a binding message for notifying an address of an agent terminal to the plurality of terminals in a broadcast manner. delete The method of claim 1,
The step of detecting the inability of the mobile router is
Outputting an event message when communication failure with the counterpart terminal occurs; And
Based on the event message, calculating that the mobile router is disabled. The method of claim 1,
The step of connecting to the access router
Transmitting, by the proxy terminal, a binding message for replacing the disabled mobile router in a broadcast manner;
Transmitting, by the plurality of terminals, their IDs to the proxy terminal in response to the binding message;
Transmitting, by the proxy terminal, an access request message for accessing the access router; And
And storing the address of the mobile router and the address of the proxy terminal in which the access router is disabled. The method of claim 1,
Resuming the communication service comprises:
Transmitting, by the access router, a binding update request to a central management server;
Storing, by the central management server, change information of the mobile router based on the binding update request;
Transmitting, by the central management server, a binding message for transmission of communication traffic generated before the mobile router is disabled, to the proxy terminal; And
And generating, by the proxy terminal, a traffic tunnel with the access router based on the address of the disabled mobile router. According to claim 7
If the proxy terminal transmits all the generated communication traffic to the counterpart terminal before the mobile router is disabled, releasing the traffic tunnel; The partial distributed mobility management method further comprising.

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