KR101072678B1 - Communication method for peer to peer voip based on olsr protocol in wireless network and node for implementing the same - Google Patents

Abstract

The present invention relates to a peer-to-peer VoIP communication method based on OLSR protocol in a mobile wireless network and a node performing the same.
In order to achieve the above object, an OLSR protocol-based Peer to Peer VoIP communication method in a mobile wireless network according to an embodiment of the present invention comprises the steps of: (a) acquiring information of a node in the mobile wireless network according to the OLSR protocol; Forming a logical topology of a node in the mobile wireless network using the information and managing a routing table using the logical topology; and (c) information of a target node among the information obtained in step (a). Performing VoIP communication with the destination node using a routing table.
In addition, a node performing peer to peer VoIP communication based on OLSR protocol in a mobile wireless network according to an embodiment of the present invention acquires information of a node in a mobile wireless network according to an OLSR protocol and uses the information to perform the mobile communication. An OLSR processor for managing a routing table using the logical topology and forming a logical topology of a node in a wireless network and VoIP communication with the destination node using the routing table and information of the target node among the information obtained by the OLSR processor. It includes a VoIP unit to perform.

Description

The communication method and node for the communication in the mobile wireless network based on the OLE SRT protocol based on the protocol OLEP ＴＯ ＰＥＥ PEＯＩＰ

The present invention relates to a peer-to-peer VoIP communication method based on OLSR protocol in a mobile wireless network and a node performing the same.

The present invention is derived from a study performed as part of the industrial technology convergence project of the Korea Institute of Industrial Technology Evaluation and Management. [Task Management No .: 2008-F-002-02, Title: Development of Next Generation Tactical Defense Communication Source Technology]

Mobile Ad-hoc Networks (MANET, hereinafter referred to as "Mobile Wireless Networks") are mobile nodes that do not have an infrastructure such as a base station or an Access Point (AP). A network that communicates with each other in cooperation.

In the case of the conventional VoIP, a proxy server is used to perform SIP communication, and a registration server and / or DNS in which a partner peer location is registered is used to know a peer peer location to communicate with. . Also, in the case of Peer to Peer VoIP, IP address information of each peer is assigned to the VoIP terminal, and the information is stored in the server and the individual terminal.

Therefore, when the IP address of the peer terminal is changed, communication is impossible because the peer IP address information is not known until the changed IP address information is stored in the server and the individual terminal. In the case of a mobile wireless terminal having mobility, there is a problem that VoIP communication is impossible due to the same problem even when there is no access point (AP) for communication.

As described above, in order to perform Peer to Peer VoIP communication in a mobile wireless network, there is a problem in that address information of a counterpart node must be known in advance or a separate SIP proxy server and DNS are required. In addition, there is a problem in that it is not possible to perform VoIP communication with a node outside the mobile wireless network formed by a predetermined protocol.

Accordingly, the present invention provides a peer-to-peer VoIP based on OLSR protocol in a mobile wireless network which solves the problem of having to know the address information of the other node in advance or requiring a separate server in order to perform peer to peer VoIP communication in the mobile wireless network. It is an object of the present invention to provide a communication method.

Another object of the present invention is to provide a OLSR protocol based Peer to Peer VoIP communication method in a mobile radio network, which can perform Peer to Peer VoIP communication with a node outside the mobile radio network formed with the OLSR protocol.

The objects of the present invention are not limited to the above-mentioned objects, and other objects and advantages of the present invention, which are not mentioned above, can be understood by the following description, and more clearly by the embodiments of the present invention. It will also be appreciated that the objects and advantages of the present invention may be realized by the means and combinations thereof indicated in the claims.

In order to achieve the above object, an OLSR protocol-based Peer to Peer VoIP communication method in a mobile wireless network according to an embodiment of the present invention comprises the steps of: (a) acquiring information of a node in the mobile wireless network according to the OLSR protocol; Forming a logical topology of a node in the mobile wireless network using the information and managing a routing table using the logical topology; and (c) information of a target node among the information obtained in step (a). Performing VoIP communication with the destination node using a routing table.

In addition, a node performing peer to peer VoIP communication based on OLSR protocol in a mobile wireless network according to an embodiment of the present invention acquires information of a node in a mobile wireless network according to an OLSR protocol and uses the information to perform the mobile communication. An OLSR processor for managing a routing table using the logical topology and forming a logical topology of a node in a wireless network and VoIP communication with the destination node using the routing table and information of the target node among the information obtained by the OLSR processor. It includes a VoIP unit to perform.

According to the present invention, in order to perform Peer to Peer VoIP communication in a mobile wireless network, it is necessary to know address information of a counterpart node in advance or a separate server may be solved.

In addition, according to the present invention, it is possible to perform Peer to Peer VoIP communication with a node outside the mobile wireless network formed by the OLSR protocol.

1 is a diagram illustrating multi-hop VoIP communication in a mobile wireless network constructed using an OLSR protocol according to an embodiment of the present invention.
FIG. 2 is a diagram illustrating an example in which an MPR and an MPR selector dynamically configure a logical topology using an OLSR protocol.
3 is a flowchart illustrating a OLSR protocol based peer to peer VoIP communication method in a mobile wireless network according to an embodiment of the present invention.
4 is a block diagram illustrating a configuration of a node for performing peer to peer VoIP communication based on OLSR protocol in a mobile wireless network according to an embodiment of the present invention.
5 is a diagram illustrating an OLSR processor according to another exemplary embodiment of the present invention.
6 is a diagram illustrating Peer to Peer VoIP communication with a node outside of a mobile wireless network according to an embodiment of the present invention.
7 is a diagram illustrating a message format extending an HELLO message of an OLSR protocol according to an embodiment of the present invention.
8 is a diagram illustrating a message format in which a TC message of the OLSR protocol is extended according to an embodiment of the present invention.

The above and other objects, features, and advantages of the present invention will become more apparent by describing in detail exemplary embodiments thereof with reference to the attached drawings, which are not intended to limit the scope of the present invention. In the following description, well-known functions or constructions are not described in detail since they would obscure the invention in unnecessary detail. Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. In the drawings, the same reference numerals are used to indicate the same or similar components.

1 is a diagram illustrating multi-hop VoIP communication in a mobile wireless network constructed using an OLSR protocol according to an embodiment of the present invention.

Referring to FIG. 1, a mobile wireless network constructed using the OLSR protocol according to the present invention has a logical network topology, and Ad-Hoc-based multi-hop communication is possible using this topology.

In other words, each node (Node A through Node J) broadcasts its own information using the OLSR protocol and the node that receives the broadcasted information retransmits the information back to the neighboring nodes, thereby resolving the information back to the neighboring nodes. Node J) can share information with each other. Using this shared information, nodes A to J form a mobile radio network based on the OLSR protocol, and the mobile radio network has a logical network topology as shown in FIG. 1. Therefore, each node (Node A to Node J) may manage the routing table based on the formed network topology information.

In this manner, Node A may perform multi-hop VoIP communication with Node J.

The OLSR protocol is defined in RFC3626 "Optimized Link State Routing Protocol (OLSR)" and each protocol for VoIP communication is defined in RFC3261 "SIP: Session Initiation Protocol" and RFC4566 "SDP: Session Description Protocol".

FIG. 2 is a diagram illustrating an example in which an MPR and an MPR selector dynamically configure a logical topology using an OLSR protocol.

Referring to FIG. 2, an MPR node (multiple relay: information transfer node) plays a role of delivering information about a topology to MPR selectors (MSs) that have selected themselves as MPRs among nodes having a 1-hop relationship with themselves. . That is, the MPR is a node selected according to the OLSR protocol to prevent packet flooding due to retransmission of the same message, and only nodes selected as the MPR are responsible for retransmission. In one embodiment, each node may select as its MPR the node that has the most of its two or more neighboring nodes.

The OLSR protocol defines four messages as described below. Thus, each node constructs a logical topology by broadcasting and retransmitting such messages. Hereinafter, four messages (HELLO, MID, TC, HNA messages) will be described.

The HELLO message contains information about the node itself and about one-hop neighbor nodes. One-hop refers to the distance that can be reached without going through another node. A node at one-hop distance is called a one-hop node or a one-hop neighbor node.

A node that receives a HELLO message recognizes the message originator address in the HELLO message as its 1-hop neighbor node, and recognizes the addresses of the 1-hop neighbor node in the HELLO message as its 2-hop neighbor node. To be recognized. Detailed procedures for processing this information are described in the RFC3626 document and will be omitted. As such, each node of the mobile wireless network may configure a logical topology of up to two hops through the HELLO message.

MID messages are used by nodes with multiple OLSR interfaces to advertise information about their interfaces.

The TC message is retransmitted by the MPR and includes topology information for forming a logical topology. A node selected as an MPR broadcasts information about its MPR Selector node in a TC message, and the MPRs that receive the MPR are retransmitted to share a logical topology between multi-hops.

The HNA message defines the information for the connection with the Non-OLSR interface.

By using the OLSR protocol, each node (terminal) in the mobile wireless network can dynamically obtain address information of another node, and can manage a routing table using a logical topology.

Therefore, since the source node (source terminal) can perform SIP communication with the target node based on the address information of the dynamically acquired target node (target terminal), Peer to Peer VoIP communication according to the present invention is the address of the target terminal There is no need for a separate proxy server and DNS server to know information or to relay SIP communications.

Regarding the relay of SIP communication, a managed routing table is used based on a logical topology. That is, each of the terminals participating in the mobile wireless network may relay the SIP packet based on the routing table managed by the terminals. Based on the relayed SIP communication, session initiation for multimedia transmission can be performed in a peer to peer manner.

4 is a block diagram illustrating a configuration of a node (terminal) for performing OLSR protocol based Peer to Peer VoIP communication in a mobile wireless network according to an embodiment of the present invention.

The node of the mobile wireless network includes an OLSR processor 400, a VoIP unit 410, and a transceiver 420.

The VoIP unit 410 performs VoIP communication with the target terminal using the address information of the target terminal obtained by the OLSR processing unit 400. As described above, the VoIP unit 410 may use the SIP and SDP protocol to perform Peer to Peer VoIP communication with the target terminal.

The OLSR processor 400 dynamically acquires information on nodes in a mobile radio network according to the OLSR protocol to dynamically construct a logical topology, and manages a routing table based on this.

The transceiver 420 communicates with nodes in a mobile wireless network.

Preferably, the OLSR processor 400 includes a message generator 404, a message processor 406, a storage 408, a routing unit 410, and a controller 402.

The message generator 404 generates the above-described OLSR message (HELLO, MID, TC, HNA message).

The message processor 406 processes the OLSR messages (HELLO, MID, TC, HNA messages) received through the transceiver 420 according to the OLSR protocol.

The storage unit 408 stores the information and the routing table of the nodes obtained by the message processing unit 406 by processing the OLSR message (HELLO, MID, TC, HNA message).

The routing unit 410 manages the routing table based on the logical topology formed by using the information of the nodes obtained by processing the OLSR message (HELLO, MID, TC, HNA message).

The controller 402 receives the OLSR protocol communication start signal from the VoIP unit 410 so that the message generator 404, the message processor 406, the storage 408, and the routing unit 410 perform their respective functions. To control. In addition, the controller 402 provides information necessary for the VoIP unit 410 to perform peer to peer communication.

3 is a flowchart illustrating a OLSR protocol based peer to peer VoIP communication method in a mobile wireless network according to an embodiment of the present invention.

Referring to FIG. 3, the OLSR processor 400 starts OLSR protocol communication (S302). Step S302 may be performed by being requested by the VoIP unit 410 or may be periodically performed.

The OLSR processor 400 configures a dynamic topology by transmitting and receiving OLSR messages (HELLO, MID, TC, HNA messages) according to the OLSR protocol (S304).

The VoIP unit 410 obtains node information of the topology from the OLSR processing unit 400 (S306). As a result, information (eg, IP address information) of the target terminal can be obtained.

The VoIP unit 410 performs SIP communication using the address information and the routing table of the target terminal (S308).

The VoIP unit 410 may transmit data to the target terminal through a session connected by SIP communication (S310).

5 is a diagram illustrating an OLSR processor 400 according to another embodiment of the present invention.

Referring to FIG. 5, the OLSR processor 400 may generate and implement each thread for each type of job to be performed. As shown in FIG. 5, each thread gets a task assigned to it through an event call from a queue or operates in a periodic manner. Through this asynchronous operation, the bottleneck caused by frequent transmission and reception of the OLSR protocol is solved, and the solution of the bottleneck prevents automatic destruction of each message of the OLSR protocol.

The thread manager 500 performs a function of the controller 402, and the Hello Gen 512, the MID Gen 514, and the TC Gen 516 generate respective messages, and the Hello Proc 522 and the MID Proc ( 524 and TC Proc 526 process each message received by Receiver 520. The repository manager 518 processes each message to store and manage the information of each node, and the routing manager 528 performs the function of the routing unit 410.

6 is a diagram illustrating Peer to Peer VoIP communication with a node outside of a mobile wireless network according to an embodiment of the present invention. That is, according to the present invention, by extending the OLSR protocol, it is possible to advertise that it is a node capable of serving as a gateway, and using the advertised information, a node and a peer to peer outside the mobile radio network (MANET). VoIP communication can be performed.

To this end, the present invention extends the HELLO message and the TC message of the OLSR protocol.

First, referring to FIG. 7, a message format extending an HELLO message of the OLSR protocol will be described. In the HELLO message format, an unused Reserved field is defined as an EnableGW field 700, and the EnableGW field 700 allows the advertisement to advertise itself as a gateway. The value of the field 700 of the EnableGW has a value of 0 or 1, and if it is 1, it indicates that the gateway serves as a gateway.

Referring to FIG. 8, a message format in which a TC message of the OLSR protocol is extended will be described. In the OLSR protocol, TC messages are forwarded up to 255 hops, which propagates topology information to nodes on a mobile radio network (MANET). By extending these TC messages, the mobile radio network can know which node is acting as a gateway. It can propagate up to 255 hops on (MANET).

The Reserved field, which is not used in the TC message format, is defined as a gateway field 800, and information of a node serving as a gateway among nodes in the topology is transmitted through the gateway field 800. The gateway field 800 contains information about which nodes are gateways in the Advertised Neighbor Main Address fields of the TC message format. That is, by using the gateway field 800 as 16 bits, the order of the Advertised Neighbor Main Address fields may be expressed in each bit order (Bit-Order) to advertise that it is a gateway node for up to 16 nodes. For example, the rightmost bit of the gateway filter 800 indicates whether the first Advertised Neighbor Main Address field 801 is a gateway node, and the second bit from the right of the Gateway field 800 is the second Advertised Neighbor Main Address field 801. May indicate whether is a gateway node. Since 16 nodes can be advertised as gateway nodes, the positions of the gateway nodes can be located ahead of the packet.

In order to perform the method described with reference to FIGS. 6, 7 and 8, the message generator 404 of FIG. 4 may generate an extended HELLO message and an extended TC message, and the message processing unit 406 may extend the HELLO message and the extension. The TC message may be processed, and the transceiver 420 may transmit and receive an extended message and store the storage 408 therein. The routing unit 410 may route to the outside of the mobile wireless network using this gateway node.

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). Since this process can be easily implemented by those skilled in the art will not be described in more detail.

The present invention described above is capable of various substitutions, modifications, and changes without departing from the technical spirit of the present invention for those skilled in the art to which the present invention pertains. It is not limited by the drawings.

400: OLSR processing unit 410: VoIP unit
420: transceiver unit 402: control unit
404: message generating unit 406: message processing unit
408: storage unit 410: routing unit

Claims (6)

(a) obtaining information of a node in the mobile radio network according to the OLSR protocol;
(b) forming a logical topology of a node in the mobile wireless network using the information and managing a routing table using the logical topology; And
(c) performing VoIP communication with the target node using the information of the target node and the routing table among the information obtained in step (a).
Peer to Peer VoIP communication method based on the OLSR protocol in a mobile wireless network comprising a.
The method of claim 1,
(d) obtaining information of a node serving as a gateway for the mobile wireless network; And
(e) performing VoIP communication with a node outside the mobile wireless network through the gateway node;
The information on the node serving as the gateway is included in the HELLO message and the TC message of the OLSR protocol, OLSR protocol based Peer to Peer VoIP communication method in a mobile wireless network.
The method of claim 2,
The HELLO message includes information indicating whether the node that generated the HELLO message can serve as a gateway.
The TC message includes information indicating whether each node advertised through the TC message can act as a gateway, OLSR protocol based Peer to Peer VoIP communication method in a mobile wireless network.
An OLSR processor for acquiring information of a node in a mobile wireless network according to an OLSR protocol, forming a logical topology of a node in the mobile wireless network using the information, and managing a routing table using the logical topology; And
VoIP unit for performing VoIP communication with the target node using the information of the target node and the routing table among the information obtained by the OLSR processing unit
Node for performing Peer to Peer VoIP communication based on the OLSR protocol in a mobile wireless network including a.
The method of claim 4, wherein
The OLSR processing unit obtains information of a node serving as a gateway to the mobile wireless network,
The VoIP unit performs VoIP communication with a node outside the mobile wireless network through the gateway node,
The node performing the OLSR protocol based Peer to Peer VoIP communication in the mobile radio network, the information of the node serving as the gateway is included in the HELLO message and TC message of the OLSR protocol.
The method of claim 5,
The HELLO message includes information indicating whether the node that generated the HELLO message can serve as a gateway.
And the TC message includes information indicating whether each node advertised through the TC message can function as a gateway.

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