KR100980273B1 - A processing method of prediction based handoff of heterogeneous wireless networks - Google Patents

Abstract

In the prediction-based handoff processing method between heterogeneous wireless networks in a wireless communication system in which at least one wireless LAN base station is provided in a WiBro / WiMAX network including at least one WiBRO / WMAX base station according to an embodiment of the present invention When the WiMAX base station receives the terminal handoff request message from the accessing terminal, the WiMAX base station transmits the handoff request message to the WLAN base station. When the WLAN base station receives a handoff request message, the WLAN base station interprets the handoff request message.

Description

A processing method of prediction based handoff of heterogeneous wireless networks

The present invention relates to the field of mobile communications, and more particularly, to a handoff method between heterogeneous wireless networks and a wireless communication system including heterogeneous networks.

Recently, the WiBro / WiMAX service, which enables internet access while on the go, using a portable device, has become popular. Wireless broadband (WiBro) and worldwide interoperability for microwave access (WiMAX) support a range of kilometers and fast mobility (up to 60 km / h), similar to mobile networks, and are much higher than traditional mobile networks. It has the advantage of supporting speed. This has the advantage of providing a service over a wide area since the cell radius is larger than that of the WLAN.

Nevertheless, WiBro / WiMAX has a disadvantage in that the transmission speed is lower than that of WLAN. In case of WLAN, it supports 11 ~ 54Mbps of transmission speed, so it can provide sufficient data service to users compared with wired internet. However, in the case of WLAN, the cell coverage is tens to hundreds of meters, and since it does not basically provide handoff, the existing data service is disconnected when the hot spot is left.

If the WLAN network is included in the WiBro / WiMAX network by making the most of the advantages and disadvantages of these two networks, the capacity of the WiBro / WiMAX base station may be increased, or the wireless LAN network may be used to compensate for the shadow area that the base station cannot cover. May be used.

In this situation, the handoff needs to be performed from the WiBro / WiMAX network to the WLAN network. Currently, each of the wireless networks only considers a handoff from a single network. Should be. In addition, in supporting handoffs between heterogeneous wireless networks, it is required to make a substantial portion of the handoff technology by the WLAN base station to make minimal modifications while maintaining the current infrastructure of WiBro / WiMAX.

However, the WiBro / WiMAX standard only specifies handoffs between homogeneous networks, and the WLAN standard defines only a few simple connection messages without proposing a clear handoff algorithm.

Accordingly, an object of the present invention is to provide a prediction-based handoff processing method from a WiBro / WiMAX network to a WLAN network.

Another object of the present invention is to provide a wireless communication system capable of processing handoff from a WiBro / WiMAX network to a WLAN network.

In order to achieve the above object of the present invention, in a wireless communication system of the interworking network provided with at least one WLAN base station in the WiBro / WiMAX network including at least one WiBro / WiMAX base station according to an embodiment of the present invention In the prediction-based handoff processing method between heterogeneous wireless networks, when a WiBro / WiMAX base station receives a terminal handoff request message from a connected terminal, a handoff request message is transmitted to the WLAN base station. When the WLAN base station receives the handoff request message, the WLAN base station interprets the handoff request message.

After the WLAN base station interprets the handoff message, it constructs a handoff request response message according to the WiBro / WiMAX standard and transmits the handoff request response message to the WiBro / WiMAX base station.

When the WiBro / WiMAX base station receives the handoff request response message, it transmits a handoff execution message to the WLAN base station. When the WLAN base station receives the handoff execution message, the WLAN base station interprets the received handoff execution message. After the WLAN base station interprets the received handoff execution message, the WLAN base station constructs a handoff response message according to the WiBro / WiMAX standard and transmits the handoff response message to the WiBro / WiMAX base station.

The WLAN base station performs a handoff according to the interpreted handoff execution message and then receives a join request message from the terminal. The response message for the association request is transmitted to the terminal.

After the WLAN base station transmits a response message to the association request, it is included in the WiBro / WiMAX network and connected to the WiBro / WiMAX standard as a WiBro / WiMAX gateway that connects the WiBro / WiMAX base station to the WLAN base station. Send a data path connection request message accordingly.

When the gateway receives the data path connection request message, the gateway sets a data path between the WLAN base station and the gateway and transmits a data path connection request response message to the WLAN base station. When the WLAN base station receives the data path connection request response message, the WLAN base station interprets the received data path connection request response message.

After the WLAN base station interprets the data path connection request response message, the WLAN base station constructs a data path connection response message according to the WiBro / WiMAX standard and transmits the data path connection response message to the gateway.

When the WLAN base station completes the handoff process for the terminal, the WLAN base station configures and transmits a handoff completion message to the WiBro / WiMAX standard.

In an embodiment, the terminal may be a dual mode terminal supporting both the WiBro / WiMAX standard and the WLAN standard.

In an embodiment, the WLAN base station may include a message conversion module between a control message of the WiBro / WiMAX network and a control message of the WLAN network including the WLAN base station.

In an embodiment, after the WLAN base station analyzes the control message of the WiBro / WiMAX network, the configuration value for the response message according to the WiBro / WiMAX standard may use information of the WLAN standard.

In order to achieve the above object of the present invention, heterogeneous wireless communication in a wireless communication system of at least one WLAN base station provided in a WiBro / WiMAX network including at least one WiBro / WiMAX base station according to an embodiment of the present invention. In the prediction-based handoff processing method between networks, the terminal communicates with the WiBro / WiMAX base station. The terminal discovers the WLAN base station via the WiBro / WiMAX base station. The terminal informs the WiBro / WiMAX base station that it will perform a handoff. The WiBro / WiMAX base station requests a handoff to the WLAN base station. The terminal performs an access for communication with the WLAN base station.

In an embodiment, the terminal receives a base station advertisement message periodically transmitted from the WiBro / WiMAX base station, performs the communication with the WiBro / WiMAX base station, and identifies IDs and quality of service of adjacent base stations. ) May obtain parameters and channel information to manage the list of adjacent base stations. The base station advertisement message may include both information on the WiBro / WiMAX base station and information on the WLAN base station.

In order to achieve the above object of the present invention, a wireless communication system according to an embodiment of the present invention includes a terminal capable of accessing a WiBro / WiMAX network and a WLAN network, and at least one WiBro / WiFi / WiFi / WiMAX network. WiMAX base station; The WiBro / WiMAX network provided in the WiBro / WiMAX network and the Wi-Fi / WiMAX gateway that connects the Wi-Fi / WiMAX network and the wireless LAN network and the Wi-Fi / WiMAX network to handle the handoff from the WiBro / WiMAX network to the WLAN network. At least one WLAN base station.

In at least one example embodiment, the at least one WLAN base station may be located within cell coverage of the at least one WiBro / WiMAX base station. The WLAN base station may include a message conversion module between the control message of the WiBro / WiMAX network and the control message of the WLAN network.

According to embodiments of the present invention, it is based on a tightly coupled network structure that can take full advantage of the WiBro / WiMAX network and the WLAN network, and supports handoff for heterogeneous wireless networks through modification of the WLAN base station. Can be. In addition, when the handoff from the WiBro / WiMAX network to the WLAN network is performed, the handoff according to the WiBro / WiMAX standard can be performed to minimize the modification of the terminal.

Hereinafter, a method of manufacturing a semiconductor device in accordance with embodiments of the present invention will be described in detail with reference to the accompanying drawings. However, the present invention is not limited to the following embodiments, and has ordinary skill in the art. It will be apparent to those skilled in the art that the present invention may be embodied in various other forms without departing from the spirit of the invention.

The terminology used herein is for the purpose of describing particular example embodiments only and is not intended to be limiting of the present invention. Singular expressions include plural expressions unless the context clearly indicates otherwise. In this application, the terms "comprise" or "having" are intended to indicate that there is a feature, number, step, action, component, part, or combination thereof that is described, and that one or more other features or numbers are present. It should be understood that it does not exclude in advance the possibility of the presence or addition of steps, actions, components, parts or combinations thereof. Unless defined otherwise, all terms used herein, including technical or scientific terms, have the same meaning as commonly understood by one of ordinary skill in the art. Terms such as those defined in the commonly used dictionaries should be construed as having meanings consistent with the meanings in the context of the related art and shall not be construed in ideal or excessively formal meanings unless expressly defined in this application. Do not.

On the other hand, when an embodiment is otherwise implemented, a function or operation specified in a specific block may occur out of the order specified in the flowchart. For example, two consecutive blocks may actually be performed substantially simultaneously, and the blocks may be performed upside down depending on the function or operation involved. Like reference numerals in the drawings denote like elements.

1 shows the process for Fully controlled handoff in WiBro / WiMAX.

Referring to FIG. 1, in the handoff of WiBro / WiMAX, the mobile terminal 10 (MS) first searches for an adjacent network and acquires the information. To this end, the mobile terminal 10 periodically transmits a base station advertisement (MOB_NBR-ADV: Neighbor Advertisement) from a base station 20 (BS) providing wireless connectivity to a corresponding network when the mobile terminal 10 is located anywhere in the network. Receive a message (S11). This base station advertisement (MOB_NBR-ADV) message contains information about all base stations in the adjacent location and network attributes of the base station. Therefore, when the mobile station 10 receives the base station advertisement (MOB_NBR-ADV) message, the mobile station 10 acquires IDs, quality of service (QoS) parameters, and channel information of neighboring base stations, and uses the information to perform handoff later. Can be. Another method for acquiring network information by the mobile terminal 10 is a scanning procedure performed by the mobile terminal 10 to measure downlink signal quality received from neighboring base stations 20. to be. The mobile terminal 20 acquires a list of neighbor base stations through a base station advertisement (MOB_NBR-ADV) message and manages the list as candidate base stations for handoff by selecting an appropriate base station based on real-time link information acquired through scanning. can do.

Next, the handoff preparation step will be described.

During the handoff preparation phase, the mobile station 10 is a target base station most suitable for handoff based on signal strength and QoS parameters received from neighboring base stations acquired through a base station advertisement (MOB_NBR-ADV) message. Determine. In addition, the mobile station determines the handoff in consideration of the service quality and signal strength currently provided by the base station, and notifies the serving base station 20 serving the service by using the terminal handoff request (MOB_MSHO-REQ) message (S21). ).

The base station 20 receiving the terminal handoff request (MOB_MSHO-REQ) message transmits a handoff request (HO_REQ) message indicating a handoff request to the terminal handoff request (MOB_MSHO-REQ) message through the gateway 30 (ASN GW). The target base station 40 in the list is sent to (S22).

The target base station 40 receiving the handoff request (HO_REQ) message checks the available resources, requested resource and QoS information, and responds with the result of the handoff request in the handoff request response (HO_RSP) message. (S23).

The response result is included in the base station handoff request response (MOB_BSHO-RSP) message through the serving base station 20 to be delivered to the mobile terminal 10 (S24).

After completing response to the handoff request to the mobile terminal 10, the serving base station 20 sends a response to the handoff request response (HO_RSP) message to the target base station 40 through a handoff response (HO_ACK) message. (S22). Meanwhile, in the step S22, the serving base station 20 may notify the handoff by transmitting a base station handoff request (MOB_BSHO-REQ) message to the mobile terminal 10.

In such processes, the target base stations 40 may selectively perform data path setting with the gateway 30 in which the mobile terminal 10 is currently serving (S26). Through these steps S21 to S26, handoff is prepared.

Next, a handoff execution step will be described.

The mobile terminal 10 selects one of the target base stations determined through the handoff preparation step and if it is ready to move, it sends a serving handoff (MOB_HO-IND) message to the serving base station 20 to finally notify the fact and handoff. Perform (S31).

The serving base station 20 receiving the perform handoff (MOB_HO-IND) message transmits a handoff execution (HO_Cnf) message to the target base station 40 (S32).

The target base station 40 receiving the handoff execution (HO_CNF) message processes the handoff and responds with a handoff response (HO_ACK) message (S33). In these processes, the mobile terminal 10 may perform data path setting with the gateway 30 that is being serviced in advance (S34).

The mobile terminal 10 transmits a ranging request (RNG-REQ) message to the target base station 40 to enter the network (S41).

The mobile terminal 10 performs an additional network entry process (S42). In this case, a skippable procedure may occur according to a handoff procedure supported by the target base station 40.

At the same time, the data path setting process (S51, S52, S53) between the target base station 40 and the gateway 30 and the data path removing process (S61, S62, S63) between the existing serving base station 20 is performed. From this point in time, the target base station 40 may start service to the mobile terminal 10. In addition, a path with candidate target base stations that have previously set a data path is also removed.

After all handoff processes are completed, a handoff complete (HO_COMPLETE) message is transferred from the target base station 40 to the serving base station 30 to complete the handoff (S71).

2 schematically illustrates a configuration of a wireless communication system according to an embodiment of the present invention.

Referring to FIG. 2, the wireless communication system 100 includes a terminal 110, a WiBro / WiMAX base station 120, a BS, a gateway 140, an ASN GW, and a WLAN base station 130 or an access point (AP). ). In the wireless communication system 100, the gateway 140 is connected to the Internet 150. In addition, the WiBro / WiMAX base station 120 and the gateway 140 may configure the WiBro / WiMAX network, and the WLAN base station 130 and the gateway 140 may configure the WLAN network. In addition, the wireless communication system 100 may be a tightly-coupled interworking network structure in which the WLAN base station 140 is included in the cell coverage of the WiBro / WiMAX base station 120.

The terminal 110 may be connected to both the WiBro / WiMAX base station 120 and the WLAN base station 130 and may be a dual mode terminal supporting both the WiBro / WiMAX standard and the wireless LAN standard. In addition, the WLAN base station 130 may support some functions of the WiBro / WiMAX standard. Thus, the WLAN base station 130 processes a handoff from the WiBro / WiMAX network to the WLAN network. Although not shown, the WLAN base station 130 may include a message conversion module between the control message of the WiBro / WiMAX network and the control message of the WLAN network.

The terminal 110 has a protocol structure as shown in FIG. 3 to support both the WiBro / WiMAX standard and the wireless LAN standard.

Referring to FIG. 3, the protocol structure 200 of the terminal 110 includes an IP layer 20 as a top layer and then an interface selection layer 220. Subsequently, sub-layers of the Service-Specific Convergence Sublayer 230, the MAC Common Part Sublayer 240, and the Security Sublayer 250 are included. The protocol structure 200 of the terminal 110 also includes a PHY 260 and a WiMAX 270.

4 illustrates a method for processing prediction-based handoff between heterogeneous wireless networks in a wireless communication system according to an embodiment of the present invention.

In the method 300 for handoff processing of the terminal of FIG. 4, the wireless communication system is an interworking network including the WiBro / WiMAX base station 120 and the WLAN base station 130 in the WiBro / WiMAX network as shown in FIG. 2 and connected to the Internet. Also included is a gateway 140.

In order to perform the handoff, the terminal 100 first searches for a neighboring network to obtain information about the found neighboring network. To this end, the terminal 110 receives a base station advertisement (MOB_NBR-ADV: Neighbor Advertisement) message that is periodically transmitted from the base station providing wireless connectivity to the network when in any position of the network (S311). This base station advertisement (MOB_NBR-ADV) message contains information about all base stations in the adjacent location and network attributes of the base station. Thus, when the terminal 110 receives a base station advertisement (MOB_NBR-ADV) message, the terminal 110 acquires ID, quality of service (QoS) parameter, and channel information of neighboring base stations, and may use such information to perform handoff later. have. This message may set information about a neighbor base station by an administrator in advance. At this time, the administrator sets the information on the WLAN base station 130 as well as the WiBro / WiMAX base station 120, so that the terminal 110 thinks of the WLAN base station 130 as the WiBro / WiMAX base station 120 and additionally. Handoff to the WLAN network can be performed without modification.

When the terminal 110 receives a base station advertisement (MOB_NBR-ADV) message and acquires IDs, quality of service (QoS) parameters, and channel information of neighboring base stations, it prepares for handoff.

In this handoff preparation step, the terminal 110 determines a target base station most suitable for handoff based on the strength and QoS parameters of signals received from neighboring base stations obtained in the previous step S311. In addition, the terminal 110 determines the handoff in consideration of the service quality and the signal strength provided from the WiBro / WiMAX base station 120, which is the current base station, and is currently in service using the terminal handoff request (MOB_MSHO-REQ) message. The serving base station, that is, the WiBro / WiMAX base station 120 is notified (S321). When the WiBro / WiMAX base station 120 receives the terminal handoff request (MOB_MSHO-REQ) message, the terminal handoff request (MOB_MSHO-REQ) is transmitted through the gateway 140 through a handoff request (HO_REQ) message indicating a handoff request. The target base stations in the message are sent (S321). These target base stations include a WLAN base station 130. The target base stations that receive the handoff request (HO_REQ) message check the resources available to them, the requested resource and QoS information, and respond to the handoff request response (HO_RSP) message with the result of the handoff request (HO_RSP). S323). At this time, the WLAN base station 130 may also receive a handoff request (HO_REQ) message, interpret the content of the handoff request (HO_REQ) message, and send a response. Table 1 below shows contents of a handoff request (HO_REQ) message that a WLAN base station should know.

TABLE 1

The WLAN base station 130 may map the transferred QoS parameters with the Access Category of the WLAN as shown in Table 2 below.

TABLE 2

Also, in case of SF ID, maintain the table of [Table 3] below, which is mapped with TID (Traffic ID) of each Access Category according to the transmitted QoS Parameters, and after that, service to the corresponding SF ID is applied through mapping value. Serviced by TID. [Table 2] above is used for TID allocation by Access Category.

[Table 3]

The WLAN base station 130 transmits the environment of the WLAN network which can be supported by the UE in response to the handoff request (HO_REQ) message through the handoff request response (HO_RSP) message (S323). The handoff request response (HO_RSP) message may be configured according to the WiBro / WiMAX standard. In addition, the configuration value for the handoff request response (HO_RSP) message may use information of the WLAN standard. Table 4 below is information on the WLAN network included in the handoff request response (HO_RSP) message sent by the WLAN base station 130.

[Table 4]

The response result is included in the base station handoff response (MOB_BSHO-RSP) message through the serving base station, that is, the WiBro / WiMAX base station 120, and is transmitted to the terminal 110 (S324).

After transmitting the response message for the handoff request to the terminal 110, the serving base station, that is, WiBro / WiMAX base station 120, to the target base station, that is, the WLAN base station 130, for the handoff request response (HO_RSP) message The response is transmitted through a handoff response (HO_ACK) message (S325). The target base station, that is, the WLAN base station 130, should be able to interpret the message after receiving the handoff response (HO_ACK) message. The content of the handoff response (HO_ACK) message is not much different from the interpretation method of the previously received message. Meanwhile, in this step, the serving base station, that is, the WiBro / WiMAX base station 120 may notify the handoff by transmitting a base station handoff request (MOB_BSHO-REQ) message to the terminal 110.

If the terminal 110 selects one of the target base stations determined through the handoff preparation step and is ready to move, it sends a handoff (MOB_HO-IND) message to the serving base station, that is, the WiBro / WiMAX base station 120 (S531). Finally, it announces this fact and performs a handoff, at which time the selected target base station becomes the wireless LAN base station 130 in the handoff scenario .. The serving base station that receives the perform handoff (MOB_HO-IND) message, that is, WiBro / The WiMAX base station 120 transmits a handoff execution (HO_CNF) message to the target base station, that is, the wireless LAN base station 130, via the gateway 140 (S332), the target base station receiving the handoff execution (HO_CNF) message, That is, the WLAN base station 130 interprets the handoff execution (HO_CNF) message, processes it, and responds with a handoff response (HO_ACK) message (S333). The handoff response (HO_ACK) message The configuration value for the handoff response (HO_ACK) message may use information of the WLAN standard, in which case the WLAN base station 130 needs to perform handoff execution ( HO_CNF) message content is shown in Table 5 below.

TABLE 5

Thereafter, the information of the WLAN included in the handoff response (HO_ACK) message transmitted by the WLAN base station 130 is not significantly different from that of the previous message.

The terminal 110 transmits an ASSOCIATION REQUEST message to the WLAN base station 130 in order to enter the WLAN network (S341). At this time, a setting value for the network environment supported by the WLAN base station 130 is included in the ASSOCIATION REQUEST message and transmitted. When the WLAN base station 130 receives the association request (ASSOCIATION REQUEST) message, and transmits the association request response (ASSOCIATION MESSAGE) message to the terminal 110 (S342) allows the terminal to enter the network.

After the WLAN base station 130 transmits an ASSOCIATION MESSAGE message to the terminal 110, the gateway 140 transmits a data path connection request (PATH_REQ_REQ) message to establish a data path with the gateway 140. To transmit. Information on the WLAN network to be delivered by the data path connection request (PATH_REQ_REQ) message is shown in Table 6 below.

TABLE 6

The gateway 140 receiving the data path connection request (PATH_REG_REQ) message from the WLAN base station 130 responds with a data path connection request response (PATH_REG_RSP) message (S352). The information that should be interpreted by the WLAN base station among the information included in the data path connection request response (PATH_REG_RSP) message is not significantly different from the previously transmitted data path connection request (PATH_REG_REQ) message.

Upon receiving the data path connection request response (PATH_REG_RSP) message, the WLAN base station 130 responds through the data path connection response (PATH_REG_ACK) message (S353). The data path connection response (PATH_REG_ACK) message may be configured according to the WiBro / WiMAX standard. In addition, the configuration value of the data path connection response (PATH_REG_ACK) message may use a WLAN standard. The information of the WLAN network included in the data path connection response (PATH_REG_ACK) message is not significantly different from the contents of the previously transmitted message.

The data path removal process between the gateway 140 and the serving base station, that is, the WiBro / WiMAX base station 120 is performed while the data path is established between the gateway 140 and the target base station, that is, the WLAN base station 130. (S361, S362, S363). From the time point at which the data path is removed between the gateway 140 and the serving base station, that is, the WiBro / WiMAX base station 120, the WLAN base station 130 may start a service to the terminal 110.

When the WLAN base station 130 starts service to the terminal 110 and all handoff processes are completed, the WLAN base station 130 includes a serving base station in a handoff complete (HO_COMPLETE) message about the handoff result. That is, the transmission to the WiBro / WiMAX base station 120 (S370). The handoff complete (HO_COMPLETE) message may be configured according to the WiBro / WiMAX standard. In addition, the configuration value for the handoff complete (HO_COMPLETE) message may use a WLAN standard. In this case, values to be set by the WLAN base station 130 are as shown in Table 7 below.

TABLE 7

5 is a flowchart illustrating a prediction-based handoff processing method between heterogeneous wireless networks in a wireless communication system according to another embodiment of the present invention.

Similarly to FIG. 4, the handoff processing method of FIG. 5 is an interworking network including the WiBro / WiMAX base station 120 and the WLAN base station 130 in the WiBro / WiMAX network as shown in FIG. Included.

2 and 5, in the handoff processing method 400, the terminal 110 communicates with the WiBro / WiMAX base station 120 (S410). At this time, the terminal 110 receives a base station advertisement message periodically transmitted from the WiBro / WiMAX base station 120 to perform the communication with the WiBro / WiMAX base station 120 and performs identification (ID) and QoS of adjacent base stations. quality of service) to obtain a parameter and channel information to manage the list of adjacent base stations. In addition, the base station advertisement message may include both the information about the WiBro / WiMAX base station 120 and the WLAN base station 130. The terminal 110 discovers the wireless LAN base station 130 through the WiBro / WiMAX base station 120 (S420). The terminal 110 notifies the WiBro / WiMAX base station 120 that it will perform a handoff (S430). The WiBro / WiMAX base station 120 requests a handoff to the WLAN base station 130 (S440). The terminal 110 performs an access for communication with the WLAN base station 130 (S450).

According to embodiments of the present invention, when performing a handoff from a WiBro / WiMAX network to a WLAN network, the terminal has an effect of supporting a technology for receiving a service received in the WiBro / WiMAX network in the WLAN network. In addition, it is based on a tightly coupled network structure that can take full advantage of the WiBro / WiMAX network and the WLAN network, and can support handoffs for heterogeneous wireless networks by modifying the WLAN base station. In addition, when the handoff from the WiBro / WiMAX network to the WLAN network is performed, handoff according to the WiBro / WiMax standard can be performed to minimize the modification of the terminal. Therefore, embodiments of the present invention can minimize the modification of the terminal or the modification of the network when the handoff between the heterogeneous wireless network in a mobile communication system including a heterogeneous network to increase the capacity of the Wi-Fi / WiMAX network or WiBro It can serve as a complement to shadowed areas that WiMAX base stations cannot cover.

As described above, the present invention has been described with reference to a preferred embodiment of the present invention, but those skilled in the art may vary the present invention without departing from the spirit and scope of the present invention as set forth in the claims below. It will be understood that modifications and changes can be made.

1 shows the process for Fully controlled handoff in WiBro / WiMAX.

2 schematically illustrates a configuration of a wireless communication system according to an embodiment of the present invention.

3 shows a protocol structure of a terminal supporting both the WiBro / WiMAX standard and the WLAN standard.

4 illustrates a method for processing prediction-based handoff between heterogeneous wireless networks in a wireless communication system according to an embodiment of the present invention.

5 is a flowchart illustrating a prediction-based handoff processing method between heterogeneous wireless networks in a wireless communication system according to another embodiment of the present invention.

Claims (13)

A handoff processing method of a terminal in a wireless communication system of an interworking network having at least one WLAN base station in a WiBro / WiMAX network including at least one WiBro / WiMAX base station, Transmitting a handoff request message to the WLAN base station when the WiBro / WiMAX base station receives a terminal handoff request message from a connected terminal; Interpreting the handoff request message when the WLAN base station receives the handoff request message; After the WLAN base station interprets the handoff request message, constructing a handoff request response message according to the WiBro / WiMAX standard and delivering the handoff request response message to the WiBro / WiMAX base station; When the WiBro / WiMAX base station receives the handoff request response message, transmitting a handoff execution message to the WLAN base station; Interpreting the received handoff execution message when the WLAN base station receives the handoff execution message; After the WLAN base station interprets the received handoff execution message, constructing a handoff response message according to the WiBro / WiMAX standard and transmitting the handoff response message to the WiBro / WiMAX base station; Receiving, by the WLAN base station, a handoff request message from the terminal after performing the handoff according to the interpreted handoff execution message; Transmitting a response message in response to the association request to the terminal; And And transmitting the data path connection request message according to the WiBro / WiMAX standard to a WiBro / WiMAX gateway that is included in the WiBro / WiMAX network and connects the WiBro / WiMAX base station and the wireless LAN base station. Prediction-based handoff processing method between heterogeneous wireless networks, characterized in that. delete delete delete delete The method of claim 1, wherein when the gateway receives the data path connection request message, setting a data path between the WLAN base station and the gateway and transmitting a data path connection request response message to the WLAN base station. ; And And when the WLAN base station receives the data path connection request response message, interpreting the received data path connection request response message. The method of claim 6, further comprising: after the WLAN base station interprets the data path connection request response message, constructs a data path connection response message according to the WiBro / WiMAX standard and transmits the data path connection response message to the gateway. Prediction-based handoff processing method between heterogeneous wireless networks. 8. The method of claim 7, further comprising: configuring and transmitting a handoff completion message according to the WiBro / WiMAX standard to the WiBro / WiMAX base station when the WLAN base station completes a handoff process for the terminal. Prediction-based handoff processing method between heterogeneous wireless networks, characterized in that. The module of claim 1, wherein the WLAN base station can support some functions of the WiBro / WiMAX standard, and a message conversion module between a control message of the WiBro / WiMAX network and a control message of the WLAN network including the WLAN base station. And after analyzing the control message of the WiBro / WiMAX network, the configuration value for the response message according to the WiBro / WiMAX standard uses information of the wireless LAN standard, and the terminal uses the WiBro / WiMAX standard and the wireless LAN standard. Prediction-based handoff processing method between heterogeneous wireless networks, characterized in that the dual mode terminal that supports all. delete delete delete delete

Images