KR100942923B1 - Method and System for selecting optimal DHCP server in condition of WiMedia wireless communication environment - Google Patents

Abstract

The present invention relates to a method and system for selecting an optimal DHCP server when a plurality of DHCP servers exist in a WiMedia network environment, which is a kind of a wireless personal area network (PAN) network. A DHCP server selecting method performed by a DHCP client to select a DHCP server to use among DHCP servers, the method comprising: collecting information information including power remaining information and capacity for each of the plurality of DHCP servers, and based on the collected information. It provides a DHCP server selection method comprising a step of selecting a DHCP server to use, and establishing a network using the selected DHCP server and a system for performing the same.

DHCP server, WiMedia, IP allocation

Description

Method and system for selecting optimal DHCP server in condition of WiMedia wireless communication environment

The present invention relates to a method and system for selecting an optimal DHCP server in a WiMedia network environment, which is a kind of wireless personal area network (PAN), and more particularly, to a wireless environment of a user among a plurality of dynamic host configuration protocol servers. A method and system for selecting a server with the most suitable parameters.

Dynamic Host Configuration Protocol (DHCP), which is widely used when performing TCP / IP communication wirelessly, or dynamic host configuration protocol, is a communication protocol for automatically allocating and managing configuration information necessary for executing TCP / IP communication. As defined in RFC 1541.

As a BOOTP, Dynamic Host Configuration Protocol (DHCP) server assigns IP address according to DHCP client's request. Information such as a network address, a default gateway address for DNS communication, a DNS server address, and the like are set as received information.

In most cases where only one DHCP server operates in the same network, there is no problem with the selection of a DHCP server. If there are multiple DHCP servers, the DHCP client relies on the DHCP Offer message first received. It is common to set the information.

However, as the use of operating systems that can use DHCP servers such as Linux and Vmware extends to the general user area, there are often cases where malicious DHCP servers are operating in the network, which are not normally allowed. Due to the network information allocation, incorrect network information may be received.

In addition, in a wireless PAN-based WiMedia network, in which multiple networks are mixed, DHCP server conflicts are very likely because devices generate their own addresses and determine roles without a coordinator controlling devices generating beacon groups. Big. Therefore, there is a need for a method for resolving a collision and communication impossibility between device addresses in a DHCP client that may occur due to a mixture of DHCP servers having the same function.

Accordingly, the present invention is to solve the problems and disadvantages of the prior art, to provide a method of selecting the best DHCP server in the currently connected PAN network environment when there are a plurality of DHCP servers in the wireless environment as described above. .

In order to achieve the above object, the present invention provides a DHCP server selection method performed by a DHCP client to select a DHCP server to be used from among a plurality of DHCP servers on the WiMedia wireless network, Capacity and power remaining information for each of the plurality of DHCP servers Collecting information including a; and selecting a DHCP server to use based on the collected information, and establishing a network using the selected DHCP server provides a DHCP server selection method.

According to another aspect of the present invention, a DHCP server selection method performed by a DHCP server to select a DHCP server to use among a plurality of DHCP servers on a WiMedia wireless network, the method comprising: receiving a DHCP Discover message and responding to the message; Checks its IP pool and sends a DHCP Offer message if additional IP allocation is possible, and upon receiving an information request message, responds with DHCP server information including its Capacity, connection information, and power remaining information. And providing a DHCP server, and receiving a DCHP Request message, determining the configuration in response to the DCHP Request message, and transmitting a DHCP Ack message.

According to another aspect of the present invention, in the WiMedia client that performs data communication by assigning an IP in a DHCP manner over a WiMedia wireless network, a client configuration information storage unit for storing wireless environment configuration information may include at least one DHCP server. A server information storage unit for collecting server information including capacity and power remaining information for each DHCP server, selecting an optimal DHCP server based on client configuration information and server information included in the storage units, or according to a user input It provides a WiMedia client comprising a server selection unit for selecting a DHCP server.

According to the present invention, even if there are a plurality of DHCP servers in the same wireless network in a WiMedia wireless environment, it is possible to easily collect configuration information of the server and select a DHCP server that provides an optimal speed and network configuration in a wireless environment. Receiving incorrect network information, which is a problem of the wired-based DHCP server selection method, can solve a configuration problem that is difficult to recover.

Details of the above object and technical configuration and the effects thereof according to the present invention will be more clearly understood by the following detailed description with reference to FIGS. 1 to 3 which illustrate preferred embodiments of the present invention.

1 is an overall configuration diagram showing a system for wireless data transmission and reception of the DHCP client system of the present invention.

Referring to Figure 1, the wireless DHCP client according to the present invention is largely composed of the WiMedia host processor 100 and the WiMedia MAC processor 200.

The WiMedia host processor 100 searches for devices belonging to the WiMedia network, connects to the coordinator device based on the found information, and transmits / receives the TCP / IP-based data transmission / reception processing unit 111 to participate in the PAN network. WiMac protocol processing unit 110 including a data transmission and reception unit 112 for the host, HCI (Host Control Interface) based protocol processing unit 120 for transmitting TCP / IP-based data through the host interface, and on the actual hardware The USB device packet processor 130 is responsible for timing and data retransmission.

The WiMedia MAC processing unit 200 is a transmission FIFO management unit 210 and a reception FIFO management unit 220 for managing data transmitted and received through the host interface, MAC protocol processing unit 230 for transmitting the received data in accordance with the WiMedia standard protocol ), And a UWB PHY transceiver 240 for transmitting via a wireless communication PHY interface.

The WiMedia-based DHCP client system of the present invention is configured to select a DHCP server suitable for the current DHCP client wireless environment or set by the user when the network participates in the WiMac protocol processing unit 110 and use it.

To this end, the WiMac protocol processing unit 110 includes a client configuration information storage unit for storing wireless environment configuration information of a DHCP client system, a server information collection unit for requesting server information from DHCP servers transmitting a DHCP Offer message, and receiving the server information; A server information storage unit that stores server information collected from one or more DHCP servers through the server information collection unit, and selects an optimal DHCP server based on client configuration information and server information included in these storage units, or based on user input. It includes a server selector for selecting a server.

When the optimal DHCP server selection is completed, the DCHP client system according to the present invention is connected to a DHCP server, is assigned an IP, and initiates wireless data transmission and reception.

In the above embodiment, the client configuration information storage unit, the server information storage unit, and the server selection unit have been described as being included in the WiMac protocol processing unit 110. However, this is merely an example and may be included in other components or disposed independently. Of course it can be.

 FIG. 2 is a flowchart illustrating an operation performed between a DHCP client and a server for selecting an optimal DHCP server in a network environment in which a plurality of DCHP servers exist.

The DHCP client joins the PAN network and configures its own network information according to the WiMedia connection protocol. In this case, the network information is dynamically set up using the static IP allocation method or the DHCP protocol. You can use the way information is allocated from the server.

In general, a method of dynamically receiving an IP assignment using a DHCP protocol is mainly used. In this case, network allocation is performed according to the process shown in FIG.

The DHCP client accessing the WiMedia network and obtaining the permission of the network channel starts the network configuration (200), and first broadcasts the DHCP Discovery 210 packet in the form of an L2 broadcast message.

After receiving the message, the DHCP servers 1 and 2 check their IP pool, and if the IP allocation is possible, configure the configuration (220, 220 '), and then provide the IP provider with a DHCP Offer message (230, 230'). Will be sent.

In the conventional DHCP client, the network is configured with the configuration of the first DHCP server. However, the above-described problem may occur in a WiMedia PAN environment in which a plurality of DHCP servers may exist. For example, a timer is set for 5 seconds to receive DHCP Offer messages 230 and 230 'from all DHCP servers that it can receive.

When receiving a plurality of Offer messages 230 and 230 ', a DHCP server that is optimal for its wireless environment is selected 240 using a configuration selection method described below.

When the DHCP server is selected, the DHCP request message 250 is transmitted to the corresponding server to request the DHCP server to confirm its IP allocation information as the configuration. Upon receiving this message, the DHCP server confirms the configuration of its own IP pool (260) and sends an DHCP ACK 270 response message to the client for IP assignment.

The DHCP client receiving the DHCP ACK message determines the network information of the DHCP client by setting the network setting 280.

3 is a diagram illustrating a series of processes by which a DHCP client selects a DHCP server.

First, the DHCP client starts a timer (S300) and goes through a process of storing a DHCP Offer message received during a predetermined time. That is, if a DHCP Offer message is received after the timer is started (S310), the received DHCP server information is stored before the timer expires (S320).

After the timer expires (Yes in S330), the client determines whether there are a plurality of received DHCP servers (S340).

If there is a plurality of information of the server through the DHCP server decision information collection process to collect the capacity, connection information, etc. for each DHCP server using the WiMedia protocol characteristics to collect the characteristic information of each DHCP server (S350).

After collecting the server information through this process, the most suitable DHCP server is determined based on this information (S370).

Determination of the DHCP server is illustrated by the user selecting (S360) in FIG. That is, the DHCP client provides the collected information through the server selection screen of the WiMedia device user and requests the user to select a server directly. A configuration may be taken to determine a DHCP server based on the user's selection by this request.

To this end, it is preferable to include a means for providing a list of the DHCP client server to the user, and input means for receiving a user selection.

However, unlike this, the DHCP client can automatically select the DHCP server based on the information of the automatically collected server to complete the server determination process.

Hereinafter, the above-described server information collecting step (S350) will be described in more detail.

The network discovery process for discovering wireless channels in a WiMedia network is called beaconing. By receiving the channel information during this Beacon Period, the network ID for the PAN network existing within its surroundings (radius 10 ~ 100m) and the coordinator and participant responsible for channel allocation of the PAN network. Information can be collected.

Server information collection, or IE (Information Element) collection process is performed in two steps.

First, DHCP server, server PHY_Rate, and Capacity information belonging to each PAN network can be collected by using Beaconing IE Request / Response Packet in the network participation interval channel slot given every predetermined time (256ms).

When a DHCP client sends an IE Reqeust Packet, the DHCP server receives the response packet and sends a response packet. When the DHCP packet corresponds to a DHCP server having a Device Type field of 1, the information included in the PHY rate / Life Time field To the DHCP server information.

4 shows a configuration of a request packet. The element ID field has a unique ID for each PAN network, defines a request type by the value of the MAC Capability Bitmap field, and requests DHCP server information as in the present embodiment. In case of doing so, set as link feedback (0xb7).

FIG. 5 illustrates a configuration of a response packet to which a DHCP server receiving a request packet responds.

Element ID field of Response Packet sets unique ID per PAN network of DHCP server, Device Type field is set to 1 (true) when corresponding device is DHCP server, and PHY Rate field supports each wireless device. The speed is specified in the field. WiMedia wireless chip supports various transmission speeds up to 480Mbps ~ 20Mbps.

The Life Time field contains battery level information. Due to the characteristics of PAN network devices, many devices operate on batteries rather than devices that operate in power mode. Provided by the hierarchy.

Secondly, once the IE information is collected, a ranging measurement process is performed on the DHCP server. Due to the characteristics of the RF chip used in WiMedia, distance measurement between two devices is possible. This is called Ranging Measurement. This functionality is provided by WiMedia MAC instrumentation and is simply performed through Ranging SAP (Service Access Point) calls. This Ranging Measurement measures the distance between a DHCP server and a DHCP client.

Through the above process, PAN network information (PAN network ID and device information belonging to PAN network) existing in the periphery, DHCP server and support PHY rate (transmission rate) for each server in each PAN network, Life time (Life Time), distance information between DHCP server and client can be collected.

In this way, the information on <device information / transmission speed / available time / distance> belonging to the PAN is provided to the DHCP client user to select a DHCP server suitable for his server selection criteria, or based on the server information as described above. Therefore, DHCP client selects the appropriate DHCP server and joins the network.

Although the present invention has been shown and described with reference to the preferred embodiments as described above, it is not limited to the above embodiments and those skilled in the art without departing from the spirit of the present invention. Various changes and modifications will be possible. Therefore, the scope of the present invention will be defined by the description of the claims below.

1 is a block diagram of a WiMedia-based DHCP client system according to the present invention.

FIG. 2 is a sequence diagram illustrating operations performed between a DHCP client and a DHCP server for IP assignment on a WiMedia network. FIG.

3 is a flow chart illustrating a method performed by a DHCP client to select an optimal DHCP server.

4 is a diagram illustrating a configuration of a request packet transmitted by a DHCP client.

5 is a diagram illustrating a configuration of a response packet transmitted by a DHCP server.

Claims (11)

In the DHCP server selection method performed by a DHCP client to select a DHCP server to use among a plurality of DHCP servers on the WiMedia wireless network, Collecting information including power remaining information and capacity for each of the plurality of DHCP servers; Selecting a DHCP server to use based on the collected information; Establishing a network using the selected DHCP server DHCP server selection method comprising a. The method of claim 1, wherein the information collecting step Broadcasting a DHCP Discover message; Receiving a DHCP Offer message for a predetermined time; Determining whether a single plural number of DHCP servers in a network are determined through the received DHCP Offer message; If the plurality of DHCP servers exist in the network, collecting the information of the DHCP server; DHCP server selection method comprising a. The method of claim 1, wherein collecting information of the DHCP server is And collecting DHCP server information including connection information for each DHCP server using the WiMedia protocol characteristic. The method of claim 1, wherein selecting the DHCP server Providing a list of collected DHCP servers to the client user; Receiving a selection input of the user and selecting a DHCP server accordingly DHCP server selection method comprising a. The method of claim 1, wherein selecting the DHCP server Analyzing the collected DHCP server information; Selecting a DHCP server based on the analysis result DHCP server selection method comprising a. In the DHCP server selection method performed by the DHCP server to select a DHCP server to use among a plurality of DHCP servers on the WiMedia wireless network, Receiving a DHCP Discover message, In response to the message, checking its own IP pool and transmitting a DHCP Offer message when additional IP allocation is possible; In response to receiving the information request message, providing DHCP server information including its capacity, power level information, and connection information; Upon receiving the DCHP Request message, confirming the configuration in response and sending a DHCP Ack message. DHCP server selection method comprising a. In a client that performs data communication by assigning an IP address using a DHCP method in a wireless network, Client configuration information storage unit for storing the wireless environment configuration information, A server information storage unit for collecting server information including power remaining information and capacity for each of the DHCP servers and collected from one or more DHCP servers; Server selection unit for selecting an optimal DHCP server based on the client configuration information and server information included in the storage if there are a plurality of DHCP servers in the network or a DHCP server according to the user input Client comprising a. The method of claim 7, wherein Server information providing means for listing and providing the DHCP server information to a user; Input means for receiving a server selection input of the user Client further comprising a. The method of claim 7, wherein Server information collection means for requesting server information from DHCP server that sent DHCP Offer message and receiving it Client further comprising a. The method of claim 7, wherein The server information client further comprises connection information for each DHCP server. A client according to any one of claims 7 to 10, One or more DHCP servers present in the same wireless network as the client Optimal DHCP server selection system comprising a.

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