KR101191723B1 - Method for discovering neighbor networks in mobile station and network system for enabling the method - Google Patents

Abstract

The present invention relates to a wireless network, and more particularly, a method (*''and system''*) which a mobile station discovers a neighbor network in an Internet protocol based wireless network, a network management server for enabling the method, and a method of operating the network management server. A network management server of a wireless network system, the server including: a neighborhood (NH) database maintaining configuration information with respect to at least one neighbor network; a communication interface receiving a request message for capability/configuration information of the neighbor network from a mobile station which is connected via a predetermined access point or a base station; and a database management unit extracting the capability/configuration information of the neighbor network which is included in the request message by referring to the neighborhood database, and controlling a reply message including the capability/configuration information to betransmitted to the mobile station via the communication interface.

Description

METHOD FOR DISCOVERING NEIGHBOR NETWORKS IN MOBILE STATION AND NETWORK SYSTEM FOR ENABLING THE METHOD}

1 is a block diagram illustrating an overview of a network including a network management server and a mobile station in accordance with the present invention in a wireless network system composed of two or more heterogeneous networks.

2 is a flowchart illustrating an example of a neighbor network discovery method according to an embodiment of the present invention.

3 illustrates an example of a performance / configuration information request message for requesting performance / configuration information of a neighbor network from a mobile station to a network management server according to an embodiment of the present invention.

4 is a diagram illustrating an example of a performance / configuration information reply message for transmitting performance / configuration information from a network management server to a mobile station to a neighbor network according to an embodiment of the present invention.

5 is a diagram illustrating an example of an IEEE 802.21 frame format including a performance / configuration information request message and a performance / configuration information response message according to an embodiment of the present invention illustrated in FIGS. 3 and 4.

<Explanation of symbols for the main parts of the drawings>

111: access point 113: network management server

120: Naver hood database 130: mobile station

The present invention relates to a wireless network, and more particularly, to a method for a mobile station (MS) to discover a neighbor network in a wireless network based on an Internet protocol (IP), and a method for the same. The present invention relates to a network management server and a method of operating the server.

As the demand for mobile communication grows, many wireless networks are being developed, and various discussions about next generation networks (NGNs) for providing a seamless service between these heterogeneous wireless networks are performed. And technology development is in progress.

Such wireless networks include Local Area Networks (LANs), Wide Area Networks (WANs), Metropolitan Area Networks (MANs), Wireless Local Area Networks (WLANs), and Wireless Personal Area Networks (LANs). Wireless Personal Area Network (WPAN), General Packet Radio Service (GPRS), and other Wireless Fidelity, worldwide interoperability for microwave access (WiMAX), and code division multiple access (CDMA) Wi-Fi is a term that refers to a specific type of WLAN that uses the IEEE 802.11 family of specifications WiMAX is a form of broadband wireless connection based on the IEEE 802.16 standard for MAN. Such wireless network systems may be personal computers, mobile phones, or other portable devices. Communication between various mobile stations (MS), such as a communication terminal, enables the above-described wireless network system, such as an access node or an access point on which entry / exit of user traffic is performed. It further comprises one or more bridge elements.

In a situation where various kinds of wireless network technologies described above are developed and implemented, compatibility problems between two or more heterogeneous wireless networks are emerging. In other words, the technology of assigning an IP address to an individual mobile station (MS) is limited for compatibility between heterogeneous wireless systems, called All-IP. In addition, mobile IPv6 (IP version 6) development to secure address resources under All-IP, Naver network discovery technology under IPv6, and mobility service improvement technology including handover in IPv6. Various related technical issues are being raised, and in particular, a method for discovering a neighbor network of a mobile station (MS) located in two or more heterogeneous wireless networks in an All-IP environment is a problem. And the Naver network discovery technology is essential for determining which wireless network MSs in heterogeneous wireless network environments including CDMA2000 networks will connect to or to which wireless network. can do.

As such, research is being conducted to enable discovery of capability and configuration information for a neighbor network. One solution is to design a Media Access Control layer. However, such a design can simply provide some of the information needed for full discovery. In addition, the IEEE 802.11k solution for WLAN, for example, can be applied only to the IEEE 802.11 link, but is not generally applicable to heterogeneous wireless network systems. In addition, the solution through the MAC layer design has a problem that it is difficult to easily apply to legacy networks (legacy network). Similarly, some of the information about the Naver network can also be obtained by the operation of some specific protocols. For example, some information about the NAVER network can be obtained by using a protocol such as proxy router discovery used in mobile Internet Protocol version 6 (IPv6) fast handover, but this also has very limited applicability. 1) Applicability to All-IP environment, (2) Discovery of all NAVER networks around mobile station (MS), (3) Extensive learning about performance / configuration of NAVER network at mobile station (MS) Cannot solve the needs of

Currently, IEEE 802.21 Working Group (WG) proposes a variety of proposals for inter-working between heterogeneous wireless networks, such as high-speed handover support in all-IP environments. There is no technical solution for making a NAVER network discovery request, which entity responds to the NAVER network discovery request, and in what message format the request or response is sent or received.

Accordingly, a new network discovery method and a system therefor that can be used in a next-generation network system in which All-IP is expected to become popular will be newly proposed.

The present invention has been made to improve the prior art as described above, and its object is to optimize the handover of a mobile station in two or more heterogeneous wireless network environments.

In addition, an object of the present invention is to propose a Naver network discovery method that can be easily applied to a legacy network by using a general-purpose DHCP for the Naver network discovery of a mobile station.

In addition, an object of the present invention is to provide an information element for a NAVER network to a mobile station by utilizing a Media Independent Handover (IS) Information Service (MIH) proposed by the IEEE 802.21 Working Group (WG).

In addition, an object of the present invention is to present a concrete solution and transmission message format for handover between heterogeneous and earless networks, which are currently discussed in the IEEE 802.21 Working Group (WG).

In order to achieve the above-described problems of the prior art and the object of the present invention, a network management server of a wireless network system according to an embodiment of the present invention, Neighborhood (Neighborhood) for maintaining configuration information for one or more neighbor network (Neighborhood; NH) A) database; A communication interface unit for receiving a request message for performance / configuration information of a neighbor network from a mobile station connected through a predetermined access point or a base station (BS); And a database for reading the performance / configuration information of the neighbor network included in the request message with reference to the NH database, and transmitting a response message including the performance / configuration information to the mobile station through the communication interface. Characterized in that it comprises a management unit.

The method for discovering a neighbor network according to an embodiment of the present invention may include receiving beacon information from the neighbor network, and identifying the neighbor network using the beacon information. ; Transmitting a request message for performance / configuration information of the neighbor network to a predetermined network management server through an access point or a base station; And receiving a response message including the performance / configuration information for the neighbor network from the network management server.

Hereinafter, with reference to the accompanying drawings, the configuration and operation principle of the sound reproduction screen according to the present invention will be described in detail.

For reference, a mobile station (MS) as used herein refers to a PDC (Personal Digital Cellular) phone, a PCS (Personal Communication Service) phone, a PHS (Personal Handyphone System) phone, CDMA-2000 (1X, 3X). Phone, Wideband CDMA Phone, Dual Band / Dual Mode Phone, Global Standard for Mobile (GSM) Phone, Mobile Broadband System (MBS) Phone, Digital Multimedia Broadcasting (DMB) Terminal, Smart (Smart) phones, orthogonal frequency division multiplexing (OFDM), orthogonal frequency division multiplexing access (OFDMA) communication terminals, such as devices that may include a personal digital assistant (PDA), hand-held PC (Hand-Held PC), Portable terminals such as notebook computers, laptop computers, WiBro terminals, MP3 players, MD players, and the International Mobile Telecommunication-2000 (IMT-2000) terminals that provide international roaming services and extended mobile communication services. Po A portable electric and electronic device, which refers to all kinds of handheld-based wireless communication devices, which includes an orthogonal frequency division multiplexing access (OFDMA) module, a code division multiplexing access (CDMA) module, a bluetooth module, and an infrared communication module (infrared). It may be provided with a predetermined communication module such as a Data Association or a wired / wireless LAN card, and is interpreted as a concept of collectively a mobile terminal capable of performing a certain arithmetic operation by mounting a microprocessor.

In addition, a neighbor network refers to a wireless network located around a wireless network in which a mobile station MS is currently located.

1 is a block diagram illustrating an overview of a network including a network management server and a mobile station in accordance with the present invention in a wireless network system composed of two or more heterogeneous networks.

The block diagram shown in FIG. 1 shows, in advance, the capability / configuration information of a candidate wireless network among neighbors in a mobile station (MS) in accordance with the present invention. One embodiment of a wireless network system that proactively discovers is shown. A wireless network system consisting of two or more heterogeneous networks includes one or more IEEE 802.11a / 11b / 11g (WiFi) networks, a wireless local area network (WLAN), a metropolitan area network (MAN) (eg WiMAX), a wireless personal area Network (Wireless PAN), General Packet Radio Service (GPRS) network, Global System for Mobile communication (GSM) network, Code Division Multiple Access (CDMA) network (e.g., CDMA 2000), Bluetooth network or other wireless network It may consist of one or more of the. 1 shows an example of a wireless network system including two WiFi networks, one WiMAX network, and two CDMA2000 networks.

As shown in FIG. 1, the wireless network system 100 includes a plurality of mobile networks operated by a number of network operators. These mobile networks are a WiFi network 110 operated by operator A, a CDMA2000 network 140, and a WiMAX network 160, a WiFi network 150 operated by operator B, and a CDMA2000 operated by operator C. Network 170. Each of these mobile networks 110, 140, 150, 160, 170 is one or more Access Points (APs) or Base Stations for providing certain mobile services to a mobile station (MS) 130. BS) and a network management server (eg, a DHCP server) that provides host configuration information for mobile stations 130 located within the mobile network. The network management server 113 may be connected through an access point, an access router (AR), a dedicated server of an access network, or the like. In addition, the WiFi network 110 shown in FIG. 1 includes a first access point (AP1) 111, a second access point (AP2) 112, and a network management server 113. 113 is connected to the Neighborhood (NH) database 120. The NH database 120 may have the same physical location as the network management server 113 or may be a separate entity located remotely through a predetermined wired or wireless network.

In addition, the CDMA2000 network 140 illustrated in FIG. 1 includes a first base station (BS1) 141, and the WiFi network 150 includes a third access point (AP3) 151 and a fourth access point (AP4). 152, the WiMAX network 160 includes a second base station (BS2) 161, and the CDMA network 170 includes a third base station (BS3) 171. Each network 140 to 170 further includes a respective network management server.

Mobile station (MS) 130 communicates with network management server 113 via first access point (AP1) 111 (paths 114, 115). Such paths 114 and 115 will be described later with reference to FIG. 2. The Naver Hood (NH) database 120 of the network management server 113 is an access point (AP) or base station (BS) of the WiFi network 110 and one or more neighboring networks 140 to 170 located in the vicinity of the WiFi network. It includes a plurality of information fields for each. Examples of such information fields include media access control (MAC) addresses, operator identifiers, network access server (NAS) identifiers, Internet Protocol identifier information such as IPv4 / 6, and the like. In addition, as an information element (IE) as performance / configuration information that can be recorded in the NH database 120, a network type, an operator identifier, a radio type, and a roaming partner list , IPv4 / IPv6 support, security, quality of service (QoS) level information for each network, current load information for each network, geographic location, pre-authentication performance, pricing plan, Location Based Service (LBS) list, VPN support, physical layer (PHY) type, channel parameters and the like. Such information elements may be manually input by a network operator or may be automatically input from a separate network management system in the case of variable information elements that may be updated in real time.

In the wireless network, the access points (AP) 111, 112, 151, 152 and the base station (BS) 141, 161, 171, 172 generally transmit and receive data for connection between users in each wireless network. do. It also functions as an interconnection point between the wireless network and the wired network. That is, the mobile station (MS) 130, which may be referred to as a user terminal or an end terminal, may be an access point (AP) 111, 112, 151, 152 or a base station (BS) 141, 161, Through 171 and 172, a connection to the wireless network and a predetermined service provided by the wireless network may be provided.

The network management server 113 shown in FIG. 1 may be a Dynamic Host Configuration Protocol (DHCP) server. As will be appreciated by those skilled in the art, DHCP assigns an IP address to a specific DHCP client through steps (1) Discover, (2) Offer, (3) Request, and (4) ACK. The DHCP server maintains database means for recording information such as assignable IP address, lease duration of allocated IP address, DNS, Default Gateway, and WINS. The network management server 113 according to the present invention is implemented using such a DHCP server, but the function of recording the above-described information about the neighbor network in the NH database 120 to provide to the mobile station (MS) (130) In charge. Since all IP terminals including the mobile station (MS) 130 are assigned an IP address according to a universal protocol called DHCP, the performance / configuration of the NAVER network in (3) Request and (4) ACK phases according to DHCP. It is possible to discard the neighbor network around the mobile station (MS) 130 through a method of requesting information and receiving a response thereto.

In addition, the network management server 113 may include a neighbor from a mobile station connected through a predetermined access point or a base station (BS), in addition to the neighbor database (NH). A communication interface unit (not shown) for receiving a performance / configuration information request message for a network, and the NH database 120 to read performance / configuration information of the neighbor network included in the request message, and to perform the communication And a database manager (not shown) for controlling to transmit the response message including the capability / configuration information to the mobile station (MS) 130 through an interface.

2 is a flowchart illustrating an example of a neighbor network discovery method according to an embodiment of the present invention.

2, a neighbor network discovery method according to an embodiment of the present invention is performed between an AP / BS 210, a mobile station (MS) 130, a network management server 113, and an NH database 120. do.

First, the AP / BS 210 transmits a beacon periodically (periodically) to a mobile station (MS) 130 located in a neighbor network of a corresponding wireless network (step 211). The beacon includes a unique identifier (eg, MAC address information, etc.) of the AP / BS 210, and the mobile station (MS) 130 that receives the beacon is the AP / BS of the NAVER network. The unique identifier 210 is recorded and held in the predetermined recording means (step 212). The mobile station (MS) 130 sends a capability and / or configuration information request message (NH_Request_Option) for the NAVER network to the network management server 113 through an access point or base station of a wireless network currently located. Transmit (step 213). An example of a performance / configuration information request message that the mobile station (MS) 130 sends to the network management server 113 in step 213 is shown in FIG. 3.

3 illustrates an example of a performance / configuration information request message for requesting performance / configuration information of a neighbor network from a mobile station to a network management server according to an embodiment of the present invention.

The performance / configuration information request message 300 shown in FIG. 3 includes a Neighborhood (NH) Request 310 and an Option Length 320. NH Request 310 means the type of DHCP request, Option Length 320 means the size of the option (for example, byte unit). The NH Request 310 and Option Length 320 may follow the standard DHCP option format described in the DHCP reference. The MAC type 330 and the target network MAC address 340 fields may be optionally added, and the MAC type 330 includes size and format information of the target network MAC address 340 which follows. The MAC address 340 may be the MAC address of an access point or base station of a specific wireless network requested by the mobile station (MS) 130 to the network management server 113. The MAC address is information obtained by the mobile station receiving a beacon periodically transmitted from an access point or base station of the neighbor network.

The case where 330 and 340 shown in FIG. 3 is not included means that the mobile station (MS) 130 requests performance / configuration information for all NAVER networks to the network management server 113 (get_all). In addition, when 330 or 340 is included, this means that the mobile station (MS) 130 requests performance / configuration information about one or more specific NAVER networks from the network management server 113 (get_one).

Referring back to FIG. 2, the network management server 113 receiving the performance / configuration information request message NH_Request_Option illustrated in FIG. 3 from the mobile station MS 130 may perform the performance / configuration information request message NH_Request_Option. Accordingly, a predetermined query is sent to a neighborhood database (step 214). The query requests performance / configuration information for all neighbor networks around the mobile station (MS) 130 according to the performance / configuration information request message (NH_Request_Option) (in case of get_all), or the performance / configuration information request message. According to (NH_Request_Option) it is to request the performance / configuration information for the particular neighbor network around the mobile station (MS) 130 (in case of get_one).

NH database 120 parses the database field to read the performance / configuration information of the Naver network, and transmits it to the network management server 113 in a query (step 215).

The network management server 113 transmits a performance / configuration information response message (NH_Reply_Option) including the performance / configuration information of the neighbor network included in the response to the mobile station (MS) 130 (step 216).

4 is a diagram illustrating an example of a performance / configuration information reply message for transmitting performance / configuration information from a network management server to a mobile station to a neighbor network according to an embodiment of the present invention.

The performance / configuration information response message 400 shown in FIG. 4 includes a Neighborhood (NH) Reply 410 and an Option Length 420. The NH Reply 410 indicates the type of the DHCP reply, and the Option Length 420 means the size of the option (for example, in bytes). As in FIG. 3, such NH Reply 410 and Option Length 420 may follow the standard DHCP option format described in the DHCP reference. The information set 430 for NAVER NETWORK 1 includes an info length of information included in the information set 430 and info1 to info5 which are information elements (IE) for NAVER NETWORK 1. do. In addition, the information set 440 for the Naver network 2 includes an information length of the information included in the information set 440 and an information element (IE) for the Naver network 1 (info1 to info5). do. Referring to FIG. 4, a detailed structure of info3 among the information element (IE) fields included in the information sets 430 and 440 is illustrated. Info3 may include a type 451 of the information element IE, a length 452 of the information element IE, and a value 453 field.

The performance / configuration information response message NH_Reply_Option shown in FIG. 4 is the number of target networks included in the performance / configuration information request message NH_Request_Option transmitted in step 213 of FIG. 2 or is recorded in the NH database 120. For example, the number of neighboring NAVER networks is two. The information sets 430 and 440 may be larger when the number of target networks that the mobile station (MS) 130 requests for performance / configuration information increases or when the number of neighbor networks recorded in the NH database 120 is large. Can increase. In addition, although five info fields included in the information sets 430 and 440 are illustrated, this is merely an example and various design changes are possible.

Referring back to FIG. 2, the performance / configuration information response message (NH_Reply_Option) shown in FIG. 4 is transmitted to the mobile station (MS) 130, which receives the mobile station (MS) 130. The appropriate neighbor network is selected according to the information of the neighbor network included in the information response message NH_Reply_Option (step 217). Through this, the mobile station (MS) 130 performs an access procedure such as 3-way handshaking with the access point or the base station of the neighbor network to be connected (step 218), and is connected to the neighbor network through the access procedure. A mobile communication service through the neighbor network may be used (step 219). The neighbor network discovery method illustrated in FIG. 2 is a case where a mobile station (MS) 130 is located in a mobile environment as well as a case where a mobile station (MS) 130 wants to connect to a new neighbor network. It can also be used in a handover procedure for receiving a seamless service.

The neighbor network discovery method illustrated in FIG. 2 may be applied as in the following embodiments.

(1) In WiBro (part of the Wireless Internet Standard defined in IEEE 802.16) fast handoff, in order to use the same Pairwise Master Key (PMK), the mobile station 130 has a predetermined base station (BS). It should be known whether it is managed by a given network access server (NAS). By the Naver network discovery method according to the present invention, the mobile station (MS) 130 can obtain the NAS ID from the network management server 113 before the 3-way handshake with the target base station BS.

(2) The mobile station (MS) 130 may obtain the NAS ID of the target WiFi network from the network management server 113 even before handing over to the target WiFi network, thereby pre-authentication. You can proceed.

(3) The mobile station 130 can discover base stations (BSs) connected to the same IP subnet as the network in which it is currently located, and the mobile station (MS) attaches to any of these base stations (BS) ( attach), it is easy to see that the current IP configuration is valid.

(4) By learning channel information of the target access point (AP) of the performance / configuration information of the Naver network obtained by the Naver network discovery method according to the present invention, the mobile station (MS) 130 performs continuous wireless scanning ( radio scanning) can be reduced. This may increase battery performance of the mobile station (MS) 130.

(5) Since the mobile station (MS) 130 can learn the target foreign agent (FA) or the access router (AR) in advance, the mobile station (MS) 130 can handover to the target network. You can request bi-casting previously. This bi-casting is associated with semi-soft handovers that require communication with both old and new point of attachment (POA).

In addition, performance / configuration information response message (NH_Reply_Option) using a MIHF (Media Independent Handover Function) frame discussed in IEEE 802.21 Working Group (WG), which is currently working on standardization, to specify a Naver network discovery method according to the present invention. ) And performance / configuration information request message (NH_Request_Option). A frame format for request / response of an information element (IE) for a neighbor network using such a Media Independent Handover Function (MIHF) frame will be described in detail with reference to FIG. 5.

FIG. 5 is a diagram illustrating an example of an IEEE 802.21 MIHF frame format including a performance / configuration information request message and a performance / configuration information response message according to an embodiment of the present invention illustrated in FIGS. 3 and 4.

As will be appreciated by those skilled in the art, the currently discussed IEEE 802.21 MIHF frame consists of a total of six bytes of a MIHF fixed header and an undefined size MIHF variable load. Among them, the performance / configuration information request message and the performance / configuration information response message according to the present invention may be included in the MIH message ID 510 field which occupies 2 bytes of the MIHF fixed header and the MIHF-Payload 520 of the MIHF variable load. .

The MIH message ID 510 shown in FIG. 5 may be configured with a 4-bit SID (Service ID) 511, a 3-bit Option Code 512, and a 9-bit Action ID 513. Among them, a service identifier for providing an information element (IE) of the NAVER network according to the present invention is inserted into the SID 511, and the NH_Request 310 shown in FIG. 3 and the NH_Reply shown in FIG. Information is inserted, and information corresponding to Option Lengths 320 and 420 of FIGS. 3 and 4 is inserted into the Action ID 513. In addition, the MIHF-Payload 520 of the MIHF variable load includes the MAC type 330 of the target network and the MAC address 340 of the target network when the IEEE 802.21 MIHF frame of FIG. 5 is an NH_Request_Option message. You can. When the IEEE 802.21 MIHF frame of FIG. 5 is the NH_Reply_Option message, the information sets 430 and 440 of the neighbor network 1 or 2 shown in FIG. 4 may be included in the MIHF-Payload 520 of the MIHF variable load.

As such, in order to obtain performance / configuration information of the Naver network in the mobile station (MS) 130, the Dynamic Host Configuration Protocol (DHCP) widely used in the current IP network is used. Request and response of configuration information required by DHCP are included in the IEEE 802.21 MIHF frame and transmitted to allow the mobile station (MS) 130 to acquire performance / configuration information of neighboring neighbor networks in an All-IP environment. Can be.

In addition, the near-infrared body fat measurement method according to the present invention can be implemented in the form of program instructions that can be executed by various computer means can be recorded on a computer readable medium. The computer readable medium may include program instructions, data files, data structures, etc. alone or in combination. The program instructions recorded on the medium may be those specially designed and constructed for the present invention or may be available to those skilled in the art of computer software. Examples of computer-readable recording media include magnetic media such as hard disks, floppy disks, and magnetic tape, optical media such as CD-ROMs, DVDs, and magnetic disks, such as floppy disks. Magneto-optical media, and hardware devices specifically configured to store and execute program instructions, such as ROM, RAM, flash memory, and the like. The medium may be a transmission medium such as an optical or metal line, a wave guide, or the like, including a carrier wave for transmitting a signal designating a program command, a data structure, or the like. Examples of program instructions include not only machine code generated by a compiler, but also high-level language code that can be executed by a computer using an interpreter or the like. The hardware device described above may be configured to operate as one or more software modules to perform the operations of the present invention, and vice versa.

While specific embodiments of the present invention have been described so far, various modifications are possible without departing from the scope of the present invention.

Therefore, the scope of the present invention should not be limited to the described embodiments, but should be defined not only by the claims below, but also by the equivalents of the claims.

According to the present invention, handover of a mobile station can be optimized in two or more heterogeneous wireless network environments.

In addition, according to the present invention, by using a general-purpose DHCP for the Naver network discovery of the mobile station, a Naver network discovery method that can be easily applied to legacy networks is provided.

According to the present invention, an information element for a NAVER network can be provided to a mobile station by utilizing a media independent handover (MIH) information service (MIH) currently proposed by the IEEE 802.21 working group (WG).

In addition, according to the present invention, a concrete solution and transmission message format for handover between heterogeneous wireless networks, which are currently discussed in the IEEE 802.21 Working Group (WG), are presented.

As described above, the present invention has been described by way of limited embodiments and drawings, but the present invention is not limited to the above-described embodiments, which can be variously modified and modified by those skilled in the art to which the present invention pertains. Modifications are possible. Accordingly, the spirit of the present invention should be understood only in accordance with the following claims, and all equivalents or equivalent variations thereof are included in the scope of the present invention.

Claims (25)

In the network management server of a wireless network system, A Neighborhood (NH) database that maintains configuration information for one or more neighbor networks; A communication interface unit for receiving a request message for performance / configuration information of a neighbor network from a mobile station connected through a predetermined access point or a base station (BS); And A database manager which reads the performance / configuration information of the neighbor network included in the request message by referring to the NH database and transmits a response message including the performance / configuration information to the mobile station through the communication interface; Network management server comprising a. The method of claim 1, The network management server is a network management server, characterized in that the DHCP (Dynamic Host Configuration Protocol) server. The method of claim 1, The request message includes a service identifier and an option length, and optionally includes MAC address information of a target neighbor network. The method of claim 3, The response message includes a service identifier and an Option Length, (1) when the request message includes the MAC address information of the target neighbor network, the performance / configuration information of the target neighbor network; And (2) when the request message does not include the MAC address information of the target neighbor network, the network management server including the performance / configuration information of all neighbor networks recorded in the NH database. The method of claim 1, The request message has a Media Independent Handover Function (MIHF) frame format according to IEEE 802.21, The request message may include a media independent handover (MIH) identifier field including a service identifier and an option length, and a MIHF payload field including a MAC address information of a target neighbor network. . The method of claim 1, The response message has a Media Independent Handover Function (MIHF) frame format according to IEEE 802.21, The response message includes a Media Independent Handover (MIH) identifier field including a service identifier and an Option Length, and a MIHF payload field including performance / configuration information of a target neighbor network. The method of claim 6, The performance / configuration information of the target neighbor network included in the MIHF payload field is performance / configuration information for a specific target neighbor network included in the request message or all neighbor networks recorded in the NH database. Featured network management server. The method of claim 1, Wherein said network management server is located for each wireless network of said wireless network system. The method of claim 1, The performance / configuration information includes a media access control (MAC) address, an operator identifier, a network access server (NAS) identifier, and IPv4 / 6 of the access point of the neighbor network or the base station. Protocol (Internet Protocol) identifier information Network type, operator identifier, radio type, roaming partner list, IPv4 / IPv6 support, security, Quality of Service (QoS) of each network Level information, current load information for each NAVER network, geographic location, pre-authentication performance, pricing plan, location based service (LBS) list, VPN support, PHY (Physical layer) Network type), or one or more of channel parameters. The method of claim 1, Wherein said wireless network system is All-IP. In a method for discovering a neighbor network, Receiving beacon information from the neighbor network, and identifying the neighbor network using the beacon information; Transmitting a request message for performance / configuration information of the neighbor network to a predetermined network management server through an access point or a base station; And Receiving a response message including the performance / configuration information for the neighbor network from the network management server Naver network discovery method comprising a. 12. The method of claim 11, The beacon information includes a neighbor address of the access point or the base station of the neighbor network NAV network discovery method. 12. The method of claim 11, The network management server is a Naver network discovery method, characterized in that the DHCP (Dynamic Host Configuration Protocol) server. 12. The method of claim 11, The request message includes a service identifier and an Option Length, and optionally includes MAC address information of a target neighbor network. The method of claim 14, The response message includes a service identifier and an Option Length, (1) when the request message includes the MAC address information of the target neighbor network, the performance / configuration information of the target neighbor network; (2) When the request message does not include the MAC address information of the target neighbor network, the neighbor network discovery, which includes the performance / configuration information of all neighbor networks recorded in a network hood (NH) database. Way. 12. The method of claim 11, The request message has a Media Independent Handover Function (MIHF) frame format according to IEEE 802.21 MIIS, The request message includes a media independent handover (MIH) identifier field including a service identifier and an option length, and a MIHF payload field optionally including a MAC address information of a target neighbor network. Way. 12. The method of claim 11, The response message has a Media Independent Handover Function (MIHF) frame format according to IEEE 802.21 MIIS, The response message includes a network independent handover (MIH) identifier field including a service identifier and an option length, and a MIHF payload field including performance / configuration information of a target neighbor network. Way. 18. The method of claim 17, The performance / configuration information of the target neighbor network included in the MIHF payload field is the performance / configuration for all neighbor networks recorded in a specific target neighbor network or a network hood (NH) database included in the request message. Naver network discovery method, characterized in that the information. 12. The method of claim 11, And the network management server is located for each wireless network of a wireless network system. 12. The method of claim 11, The performance / configuration information includes a media access control (MAC) address, an operator identifier, a network access server (NAS) identifier, an IPv4 / 6 Internet protocol of the access point or the base station of the neighbor network. (Internet Protocol) Identifier Information Network type, operator identifier, radio type, roaming partner list, IPv4 / IPv6 support, security, quality of service level of each network Information, current load information for each Naver network, geographic location, pre-authentication performance, pricing plan, location based service (LBS) list, VPN support, physical layer (PHY) Naver network discovery method comprising one or more of a type, or a channel parameter. 12. The method of claim 11, Analyzing the performance / configuration information of the neighbor network included in the response message; Selecting a neighbor network to access according to the analysis result; And Connecting to the selected neighbor network Naver network discovery method further comprising. A computer-readable recording medium for recording a program for performing the method of claim 11. In the method for providing information of the NAVER network to the mobile station, Maintaining a neighbor hood (NH) database that records performance / configuration information for one or more neighbor networks located around the network management server; Receiving a request message for performance / configuration information of the neighbor network from a mobile station connected through a predetermined access point or base station (BS); And Reading performance / configuration information of the neighbor network included in the request message by referring to the NH database, and transmitting a response message including the performance / configuration information to the mobile station; Naver network information providing method comprising a. 24. The method of claim 23, The network management server is a Naver network information providing method, characterized in that the DHCP (Dynamic Host Configuration Protocol) server. A computer-readable recording medium for recording a program for performing the method of claim 24.

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