KR20080091540A - Methods and system for qos-guaranteed multi-mode fast mobility management in wireless networks - Google Patents

Abstract

Method and a system for QoS(Quality of Service)-guaranteed multi-mode fast mobility management in wireless networks are provided to support the IP(Internet Protocol)-based real time multimedia service efficiently when moving the mobile terminal between cells. A mobile terminal communicates an opponent terminal through an OMS(Open Mobility Management Server) via a wireless LAN base station and a router. The OMS and the router are also operated integrally. When moving the mobile terminal, the service quality of the mobile terminal is deteriorated due to the reduction of the reception electric wave. In order to compensate the deteriorated service quality, the wireless Interface is activated and the mobile terminal receives a temporal IP from the router and forms a tunnel together with the OMS. The mobile terminal transmits and receives data simultaneously in parallel by means of the tunnels 1 and 2. Accordingly, the operable effective bandwidth is increased and the reduction of the bandwidth at the tunnel 1 is compensated.

Description

Quality Assurance Multi-Mode Fast Mobility Management Method and System in Wireless Networks

1 is a block diagram of a service quality guaranteed high-speed mobility management system according to the present invention

Figure 2: Open mobility management server and mobile terminal structure according to the present invention

Figure 3: Detailed structure of mobility management information table according to the present invention

Figure 4: Call setup, parallel data transmission and call cancellation algorithm through the open mobility management server according to the present invention

5 is a parallel transmission mobility management algorithm of the open mobility management server according to the present invention

6 is a service quality guarantee mobility management algorithm of a mobile terminal according to the present invention.

According to the present invention, when a mobile terminal equipped with two or more wireless communication interfaces moves between homogeneous or heterogeneous wireless network cells, IP (Internet Protocol) -based voice calls, video calls, and video conferencing are performed in real time without degrading service quality. The present invention relates to a service quality guaranteed multi-mode high-speed mobility management method and system capable of efficiently supporting a real-time multimedia service. The wireless network may include a wireless fan (Pan), a personal area network (LAN), a wireless local area network (LAN), a metropolitan area network (MAN), and a wireless wide area network (WAN).

Looking at the conventional technology related to the present invention, the next-generation wireless communication network is a wireless fan, wireless LAN and wireless man, which are being developed in the IEEE 802 working group, together with broadband wireless completion such as 3G and 4G, interconnected on the basis of All-IP. Will be constructed. In these various wireless communication networks, the mobile terminal operates in a multi-mode equipped with a plurality of different wireless communication interfaces to support IP-based mobile real-time multimedia services such as mobile VoIP, mobile IPTV, and mobile real-time video conferencing. From the user's point of view, although these next-generation wireless networks have high-speed packet transmission capability, they provide a high-speed mobility management function that guarantees the quality of service required to provide the real-time multimedia service when a mobile terminal moves between homogeneous or heterogeneous wireless networks. There is a problem that can not be.

Looking at the prior art of mobility management when a mobile terminal moves between various wireless cell cells, the mobility management of a dual-mode phone that can switch between the GSM (Global System for Mobile Communications) network and IEEE 802.11 wireless LAN without service interruption There is a GAN (Generic Access Network) structure suggested by the ETSI TS standard in the UMA forum. In addition, IMS (Internet Multimedia System) Forum is researching seamless VoIP support in various wired / wireless converged communication networks based on Session Initiation Protocol (SIP). Meanwhile, FMCA (Fixed Mobile Convergence Alliance) has announced the linkage technology between Bluetooth wireless fan and cellular wireless network. However, GAN or IMS technology is a technology for providing a seamless IP connection from the service provider's point of view, and there is a problem of service interruption when the IP of the mobile terminal is changed, and it provides a service quality guarantee or a high speed handover function while moving. can not do.

In addition, there are MIP (Mobile IP), Fast MIP, Hierarchical MIP developed by IETF, Internet standardization organization for IP mobility management, SCTP-ADDIP for mobility management in transport layer, and SIP for mobility management in application layer. However, most of these IETF handover international standards do not provide high-speed mobility management to guarantee service quality between various heterogeneous wireless networks. Recently, in the IETF Multi-Homing working group, when a mobile node has a plurality of temporary IP addresses by mounting a plurality of different interfaces, a method for improving distributed system service reliability or performance related to the mobile node is studied. have. Unlike the research in IETF multihoming, however, in the present invention, multi-homing walking is performed by establishing parallel distributed packet tunnel through SIP-based open mobility management server located in the middle rather than end-to-end using multiple interfaces. This is different from the group's current research.

Other related researches have developed MIH (Media Independent Handover) standard interface to enable interworking of various wireless networks in data link layer in IEEE 802.21 Working Group, but it does not suggest the method of guaranteeing the quality of service when the terminal moves. In conclusion, despite the fact that many technologies and international standards have been developed to date, service quality guaranteed high-speed wireless network mobility management, which guarantees seamless mobility to users when mobile terminals move between various wireless networks, is not properly provided. It is true.

The technical problem to be achieved by the present invention is to solve the problems of the prior art as described above, a variety of mobile terminals such as mobile phones, Internet phones, smart phones, laptops in a wireless network between the same or different types of wireless network cells Its purpose is to provide a service quality guaranteed high-speed mobility management function that can efficiently support IP-based multi-party real-time multimedia services regardless of the type of wireless network.

Another object of the present invention is to increase the degraded quality of service by transmitting data in parallel by dynamically forming a two-way tunnel through a plurality of new wireless networks when the quality of service is degraded while the mobile station is in motion. Independent of the above, and to provide a service quality guaranteed high-speed mobility management structure and function without packet loss or time delay due to handover.

Another object of the present invention is to provide a service quality guaranteed high-speed mobility management structure and function applicable to both IPv4 and IPv6 networks.

The present invention provides a service quality guaranteed multi-mode high-speed mobility management method that can efficiently support IP-based real-time multimedia services regardless of the type of wireless network when a mobile terminal equipped with a plurality of wireless communication interfaces moves between cells in a wireless network. It is about the system.

Hereinafter, the configuration and operation of the embodiments of the present invention with reference to the accompanying drawings, the configuration and operation of the present invention shown and described in the drawings will be described by at least one embodiment, whereby the present invention described above The technical idea and its core composition and operation are not limited.

With reference to the drawings shown so that the present invention can be easily understood. Figure 1 shows the configuration of a service quality guaranteed high-speed mobility management system. 2 is an open mobility management server and a mobile terminal structure. 3 shows a detailed structure of the mobility management information table. 4 is a call setup, parallel data transmission and call termination algorithm through an open mobility management server. 5 is a parallel transmission mobility management algorithm of an open mobility management server. 6 is a service quality guarantee mobility management algorithm of a mobile terminal.

1 is a block diagram of a service quality guaranteed high-speed mobility management system in the various wireless networks proposed in the present invention. The communication quality of service referred to in the present invention is a data rate (or bandwidth) to be guaranteed even when the quality of service is changed due to a decrease in signal strength or congestion of a wireless network during the movement of a mobile station for a specific multimedia communication service. It can be defined as loss and time delay and response time.

In FIG. 1, a scenario for service quality guaranteed fast mobility management is as follows. First, the mobile terminal B communicates with the other terminal A through an Open Mobility Management Server (OMS) via a wireless LAN base station and router 1. In this case, an open mobility management server and a router may operate as one integrated system. B moves away from the base station on the move and degrades the quality of service due to a decrease in received radio wave strength. In order to compensate for the deteriorated quality of service, the mobile station B activates the wireless network interface and accesses the wireless network to receive a temporary IP from the router 2 to establish an open mobility management server and a tunnel 2. And the existing tunnel 1 and the newly set tunnel 2 is used to send and receive data in parallel at the same time. This increases the available effective bandwidth to compensate for the bandwidth reduction in tunnel 1 to ensure quality of service. The mobile station B is disconnected from the WLAN access point as it continuously moves, connects to the wireless man, connects to the open mobility management server through the tunnel 3, and communicates with the mobile station A. In this case, after connecting to tunnel 3, if the quality of service is guaranteed, tunnel 2 is removed.

By doing so, the mobile terminal B communicates with the open mobility management server directly at the terminal by forming an end-to-end tunnel with the terminal, unlike the conventional handover method in the conventional mobile communication network. . Unlike conventional handover methods, packet loss or delay due to handover can be eliminated while moving by transmitting and receiving data in advance by connecting to a new wireless network that can be accessed when service quality is deteriorated. Unlike the existing international IP handover standard based on IETF Mobile IP, mobile terminals A and B use SIP-based user ID to set up call through open mobility management server. Mobility and service mobility can also be provided. In particular, if the terminal A has a tunneling function like the mobile terminal B, the user ID of B may be registered in the open mobility management server to establish a tunnel between both ends, and may directly transmit and receive data. In this case, seamless fast handover is supported not only for B but also for A while moving. 1 tunnel 4 illustrates this case. Finally, the mobile station B may communicate with the mobile station C connected to the router 1 without using a tunnel.

FIG. 2 shows the structure of an open mobility management server and a mobile terminal system for the service quality guaranteed high-speed mobility management shown in FIG. 1. Here, the term open means that the open mobility management server provides a SIP-based mobility management interface for mobility management. 2 (a) is a mobility management structure of a mobile terminal. The mobile terminal is equipped with a multi-mode communication interface that can be composed of a wireless fan, a wireless LAN, a wireless man, a wireless arm, and communicates with an open mobility management server. The multimode communication interface may be composed of two or more identical wireless network communication interfaces in the case of a homogeneous wireless network. In FIG. 2 (a), the packet distributor plays a role of transmitting a packet in parallel through an open mobility management server and a plurality of data transmission tunnels, and a packet aggregator collects packets arriving through a plurality of data transmission tunnels to the other party. In charge of sending. In the case of a multi-mode mobile terminal, the power manager plays a role of minimizing power consumption that may occur when communicating through a plurality of wireless communication interfaces. The multi-mode L2 mobility manager searches for a wireless network link that can be connected when the mobile station moves and performs a layer 2 handover function. In addition, it communicates with the MIH (Media Independent Handover) server in the mobile communication system through the IEEE 802.21 MIH to import and send the information required for the management of layer 2 (L2) mobility. The third layer (L3) mobility manager communicates with the open mobility management server to perform the three-layer fast handover function to guarantee the quality of service. The service quality monitor monitors the quality of a specific service currently provided by using packet monitoring technology and notifies the open mobility management server.

In FIG. 2 (b), the mobility management information table includes mobility management-related IETF SIP-based user information, a currently connected IP address, and mobility management policy to be applied when selecting multiple wireless networks. The service quality manager manages the service quality such as packet loss, delay time, and response time, and the security manager is in charge of authentication, control, and data encryption of the wireless network or open mobility management server. It consists of an event manager that handles the occurrence of other network and an automatic configuration manager that helps automatic wireless network selection and configuration. Other roles of Quality of Service Monitor, L3 Mobility Manager, Packet Splitter, and Packet Collector are similar to those of Mobile Terminal.

3 is a detailed structure of the mobility management information table. In FIG. 3, the user ID may be represented by an e-mail address or a phone number defined in the SIP standard, and the home IP address indicates a unique internet address assigned to the user ID. The parallel connection number indicates the number of IP connections connected in parallel to the mobile terminal of the current user ID. The current connection information represents the current connection information of the mobile terminal and has n triple information (temporary IP address, authentication, bandwidth) when the mobile terminal uses n IP connections. The effective bandwidth of the quality of service is defined as the bandwidth sum of the n connections. Others include current location information of the mobile terminal and authentication of wireless networks accessible from the location. Here, the home IP address can use IPv6 as well as IPv4. Because both terminals provide tunneling function, IPv6 application can be supported because data can be exchanged with each other through end-to-end tunnel with unique IP address as IPv6. Therefore, the mobility management structure proposed in the present invention can be used by using both IPv4 or IPv6 when both ends use the same type of home IP address and both sides use the same type of temporary IP address.

4 is a call establishment algorithm between the user and the parallel data transmission call through the Open Mobility Management Server (OMS). In FIG. 4, the open mobility management server plays a role of a gateway for relaying call setting signals between both ends when setting up a call. In the case of a signal using SIP, since the terminal can process the SIP signal, the role of the open mobility management server is relatively simple. That is, the same role as the conventional SIP gateway except for establishing a tunnel between the open mobility management server and the user when transmitting data. When the opposite terminal and the mobile terminal are connected to the same router, it is not necessary to establish and use a tunnel for data transmission as described in FIG.

5 illustrates in more detail the parallel transport mobility management algorithm of the open mobility management server of FIG. The algorithm of FIG. 5 is performed after call setup in FIG. 4 is completed. In FIG. 4, the location information or the degree of congestion of the User_ID can be obtained by requesting network management information of each corresponding wireless network by referring to nearby accessible wireless network information sent by the User_ID. The access rights or authentication information for the wireless network may be owned by an open mobility management server or may be directly owned by a mobile terminal user. Once the mobile terminal accesses the wireless network, the open mobility management server grasps the service quality and bandwidth information through the wireless network, stores it in the current connection information of the mobility management information table, and continues to modify and supplement it.

6 shows a service quality guarantee mobility management algorithm of a mobile terminal. In FIG. 6, it is assumed that an initial connection is made with a specific wireless network. The mobile terminal first checks whether the effective bandwidth of the current transmission path is satisfied and if not, activates the dormant multimode communications using the radio link detector. If there is a new wireless network that can be connected, the mobile terminal sends network information to the open mobility management server through the existing wireless connection to bring the authentication method required for the connection.

If it is difficult to obtain access authority information for a new wireless network from an open mobility management server, the L2 mobility manager obtains access information if the MIH server can be accessed locally. The L3 mobility manager then accesses the new wireless network and gets a temporary IP address for temporary use. Then, the temporary IP address is used to establish a tunnel with an open mobility management server to establish a new IP transmission path, establish a parallel packet transmission path in connection with an existing transmission path, and then transmit packets in parallel. This increases the effective transmission bandwidth. If the service quality is not satisfied when the data packet is exchanged in parallel by forming a new tunnel with the open mobility management server, the open mobility until the service quality of the mobile terminal is ensured through a plurality of different wireless networks that can be connected while moving. Dynamically establishes multiple parallel data transmission tunnels with the management server to transmit data. Lastly, if the radio wave strength is weakened by the distance from a specific wireless network, the connection with the wireless network is disconnected and the open mobility management server is notified to remove the corresponding tunnel. The above described processes are repeated until the effective bandwidth is satisfied. If the effective bandwidth is satisfied, the unnecessary power consumption is reduced by putting the unused wireless communication interface through the mobile manager's power manager.

When establishing a new tunnel to guarantee the quality of service, the second layer handover is completed using the handover information from the second layer using MIH-based or proprietary technology according to the mobile terminal's movement to secure a new temporary IP address in advance. Prepare for a handover by accessing a DHCP server or by using an autoconfiguration function to obtain a new temporary IP address in advance.After the two-layer handover is completed, the temporary IP address is immediately notified to the open mobility management server for handover. Knotless mobility management without packet loss or delay.

In summary, in the various wireless networks proposed by the present invention, the method and system of high quality mobility management system guaranteeing a new transmission path dynamically before the connection from a specific wireless network is disconnected using tunneling based parallel transmission technique. Since data is transmitted / received, the same or heterogeneous wireless network moves in the overlapped region, unlike the various handover methods. Thus, there is no delay due to packet loss or handover. Moreover, quality of service can be guaranteed because the required bandwidth can be obtained through a plurality of accessible wireless networks. In particular, unlike most existing handover methods, handover preparation is started based on the quality of service, which reduces the handover time required for acquiring temporary IP by starting the handover well before disconnection due to the decrease in radio wave strength. Can be.

The present invention is a mobile phone, Internet phone, PMP in a wireless network. UltraPC. When various mobile terminals such as smart phones and laptops move between the same or heterogeneous wireless network cells, regardless of the type of wireless network, it guarantees the service quality of IP-based real-time mobile multimedia service and gives high-speed mobility management function. By having a high industrial applicability is very high.

The present invention is a mobile phone, Internet phone, PMP in a wireless network. UltraPC. When various mobile terminals such as smart phones and laptops move between homogeneous or heterogeneous cells, regardless of the type of wireless network, it guarantees the service quality of IP-based real-time multimedia service and provides high-speed mobility management function.

Another effect of the present invention is to dynamically establish a two-way tunnel by accessing a number of new wireless networks when the quality of the wireless network communication service is degraded due to a decrease in received radio signals or a congestion of the network. Therefore, the service quality is improved by transmitting data in parallel, thereby improving quality of service, independent of upper transmission and application layers, and providing a service quality guaranteed fast mobility management function without packet loss or time delay due to handover.

Another effect of the present invention is that the mobile terminal is located in an open mobility management server or when both terminals have a tunneling function, there is an effect of providing the end-to-end mobility management function.

Yet another object of the present invention is to provide a service quality guaranteed fast mobility management function applicable to both IPv4 and IPv6 networks.

Claims (12)

In the service quality guaranteed multi-mode high-speed mobility management method that can efficiently support IP-based real-time multimedia services regardless of the type of wireless network when a mobile terminal equipped with a plurality of wireless communication interfaces in a wireless network moves between cells, A mobility management table composed of a mobility management table for managing mobility of a mobile terminal and an open mobility management server for managing a mobility management table and a mobility management table for mobility management in a wireless network. Registering and storing the user ID, the unique IP address of the user, the temporary IP address currently being used, and the location of the current mobile terminal; In the wireless network, the mobile terminal and the counterpart terminal first complete a call setup by exchanging call setup and response messages with each other through an open mobility management server; After the call setup is completed between the two terminals, data is transmitted by establishing a two-way tunnel using each unique IP address and temporary IP address between the open mobility management server and the mobile terminal for data transmission, and transmitting the data to the open mobility management server and the counterpart terminal. Transmitting data without the tunnel; When transmitting the data, the mobile terminal activates a dormant multi-mode communication interface to access a new wireless network and is assigned a new temporary IP address when the service quality deteriorates while using the mobile terminal to form a new tunnel with an open mobility management server. Transmitting and receiving data packets in parallel through the existing tunnel and the new tunnel; And When the mobile terminal is far from the wireless network that is connected to the wireless network, or when the data transmission or reception is completed, or the connection is blocked for other reasons, the open mobility management server is notified to remove the tunnel and reduce power consumption. Quality of service guaranteed multi-mode high-speed mobility management method comprising the step of putting the wireless communication interface dormant state. The method according to claim 1, In the step of completing the call setup by exchanging the call setup and response message with each other, the open mobility management server registers the IP address of the counterpart in the mobility management table and sets the call with the temporary IP address of the mobile station and the IP address of the counterpart. And transmitting a response signal to complete a call setup between both terminals. The method according to claim 1, Forming a new tunnel with the open mobility management server and transmitting and receiving data packets in parallel through the existing tunnel and the new tunnel may be performed by activating a dormant multi-mode communication interface when the mobile terminal is degraded in service quality. When the information is sent to the open mobility management server, the open mobility management server identifies the congestion status and access rights of the wireless network information near the mobile terminal and sends the information to the mobile terminal. The method according to claim 1, Forming a new tunnel with the open mobility management server and transmitting and receiving data packets in parallel through the existing tunnel and the new tunnel, the mobile terminal uses the information received from the open mobility management server to access a new wireless network and create a new temporary IP. It receives an address and sends it to the open mobility management server. The open mobility management server forms a two-way tunnel using its own IP address and a new temporary IP address of the mobile terminal as entrances and exits. High speed mobility management method. The method according to claim 1, Forming a new tunnel with the open mobility management server, and transmitting and receiving data packets in parallel through the existing tunnel and the new tunnel, if the service quality is not satisfied, the quality of service of the mobile terminal through a plurality of wireless networks that can be accessed during the movement. Until this is ensured, multiple parallel data transmission tunnels are established with the open mobility management server to transmit data, and when a part of the tunnels is removed due to the movement of the mobile terminal, a new tunnel is dynamically formed to guarantee service quality. Quality assurance multi-mode fast mobility management method consisting of steps. The method according to claim 1 or 5, Dynamically forming a new tunnel to guarantee the quality of service may be performed by using two-layer handover information using two-layer handover information using MIH-based or proprietary technology according to the movement of the mobile station to secure a new temporary IP address. Before completing, connect to the DHCP server or use the address autoconfiguration function to obtain a new temporary IP address in advance to prepare for a three-tier handover, and immediately notify the open mobility management server of the temporary IP address after the two-tier handover is completed. Quality of service guaranteed multi-mode high-speed mobility management method comprising the step of providing a mobility management function without knots or delays due to handover. A service quality guaranteed multi-mode high-speed mobility management system that can efficiently support IP-based real-time multimedia services regardless of the type of wireless network when a mobile terminal equipped with a plurality of wireless communication interfaces in a wireless network moves between cells, A mobility management table composed of a mobility management table for managing mobility of a mobile terminal and an open mobility management server for managing a mobility management table and a mobility management table for mobility management in a wireless network. Means for registering and storing the user ID, the user's unique IP address, the temporary IP address currently in use, and the location of the current mobile terminal. In the wireless network, a mobile terminal and a counterpart terminal communicate with each other through an open mobility management server to exchange call setup and response messages with each other. After the call setup is completed between the two terminals, data is transmitted by establishing a two-way tunnel using each unique IP address and temporary IP address between the open mobility management server and the mobile terminal for data transmission, and transmitting the data to the open mobility management server and the counterpart terminal. Means for transmitting data without tunnels and When transmitting the data, the mobile terminal activates a dormant multi-mode communication interface to access a new wireless network and is assigned a new temporary IP address when the service quality is degraded while using it, and forms a new tunnel with the open mobility management server. Means for sending and receiving data packets in parallel over existing tunnels and new tunnels. When the mobile terminal is far from the wireless network that is connected to the wireless network, or when the data transmission or reception is completed, or the connection is blocked for other reasons, the open mobility management server is notified to remove the tunnel and reduce power consumption. Quality of service guaranteed multi-mode mobility management system consisting of a means to put the wireless communication interface dormant state. The method according to claim 7, The means for completing the call setup by exchanging the call setup and response messages with each other is that the open mobility management server registers the IP address of the counterpart in the mobility management table and sets up the call with the temporary IP address of the mobile station and the IP address of the counterpart. And a means for completing a call setup between both terminals by transmitting a response signal. The method according to claim 7, The means for forming a new tunnel with the open mobility management server and transmitting and receiving data packets in parallel through the existing tunnel and the new tunnel activates a dormant multi-mode communication interface when the mobile terminal deteriorates the quality of service while moving. When the information is sent to the open mobility management server, the open mobility management server is a service quality guaranteed multi-mode high-speed mobility management system composed of means for identifying the congestion status and access rights of wireless network information near the mobile terminal and sending it to the mobile terminal. The method according to claim 7, In the means for forming a new tunnel with the open mobility management server and transmitting and receiving data packets in parallel through the existing tunnel and the new tunnel, the mobile terminal uses the information received from the open mobility management server to connect to a new wireless network to create a new temporary IP. It receives an address and sends it to an open mobility management server. The open mobility management server is a service quality guaranteed multi-mode consisting of a means of forming a bidirectional tunnel using its own IP address and a new temporary IP address of a mobile terminal as entrances and exits. High speed mobility management system. The method according to claim 7, The means for forming a new tunnel with the open mobility management server and transmitting and receiving data packets in parallel through the existing tunnel and the new tunnel is not satisfied with the quality of service. Until this is ensured, multiple parallel data transmission tunnels are established with the open mobility management server to transmit data, and when a part of the tunnels is removed due to the movement of the mobile terminal, a new tunnel is dynamically formed to guarantee service quality. Quality assurance multi-mode high mobility management system composed of means. The method according to claim 7 or 11, The means for dynamically forming a new tunnel to guarantee the quality of service includes a two-layer handover by using two-layer handover information using MIH-based or proprietary technology according to the movement of the mobile terminal to secure a new temporary IP address in advance. Before completing, connect to the DHCP server or use the address autoconfiguration function to obtain a new temporary IP address in advance to prepare for a three-tier handover, and immediately notify the open mobility management server of the temporary IP address after the two-tier handover is completed. Quality of service guaranteed multi-mode mobility management system consisting of means that provide mobility management without knots or delays due to handover.

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