KR101209936B1 - Traffic control system and method for wireless data service - Google Patents

Abstract

The present invention effectively manages a terminal device roamed by another wireless relay device as a quasi-connection state terminal based on a predefined downlink transmission situation, and separately receives a downlink data packet to the quasi-connection state terminal. Traffic control for wireless data service that prevents the problem of system throughput degradation caused by retransmission of downlink traffic that cannot be delivered to roaming terminal equipment by storing in quasi-connection packet storage area and not trying to transmit it. Systems and methods are disclosed. In the traffic control system for a wireless data service of the present invention, when a terminal device generates a predefined device connection movement event during a connection with a specific wireless relay device, the terminal device requests and connects a device connection movement to another corresponding wireless relay device. When a predetermined downlink transmission situation occurs when a specific wireless relay device transmits a downlink data packet to the connected terminal device, the terminal device is managed as a quasi-connection state terminal. When the downlink data packet is received, the quasi-connection state is received. And storing the downlink data packet in a quasi-connected packet storage area or transmitting the downlink data packet to a terminal device managed according to the terminal.

Description

TRAFFIC CONTROL SYSTEM AND METHOD FOR WIRELESS DATA SERVICE}

The present invention relates to a traffic control system and method for a wireless data service, and more particularly, when a wireless relay device of a terminal device moves between wireless relay devices in an environment without a separate controller device, the wireless relay device connected to the terminal device is transferred to the terminal device. Traffic control system and method for wireless data service minimizing system throughput degradation through downlink traffic control in consideration of the problem of system throughput degradation caused by retransmission of unsuccessful downlink traffic, and operation method of wireless relay device and wireless relay device It is about.

A wireless data service system (Wi-Fi, Wireless Fidelity) is a next-generation communication method that further supports mobility in a short-range data communication method using a fixed access point (AP), such as a conventional wireless LAN.

In such a wireless data service system, various standards have been proposed, and international standardization of the portable Internet is currently progressing around the IEEE 802.1x. Wireless LAN terminal devices supporting Wireless LAN in IEEE 802.1x, when accessing the wireless Internet to use data services, first access the WLAN network through an access point (AP) and connect the wireless relay device. It is common to access the wireless Internet via.

In such a wireless data service system environment, when a plurality of APs are installed in a specific area such as a public institution, a school, a subway, a terminal, and the like, a seamless movement, or roaming, is performed when a terminal device moves between wireless relays. It may be provided with a controller device for managing a wireless relay device to support. However, these controller units are installed in only a few places due to their high price. Therefore, wireless data service system environment that is serviced in most areas such as public institutions, schools, subways, terminals, etc., does not have a separate controller device and installs APs that operate independently according to NAT (Network Address Translation) method. Providing.

However, in a wireless data service system environment including NAT-based APs, there is a difficulty in supporting seamless roaming of terminal devices because the APs are independently managed. In particular, the upstream traffic is generated by the terminal device, so it is supported even after roaming. However, the downlink traffic from the Internet server just before roaming of the terminal device continues to the roaming AP because the server cannot recognize the movement of the terminal device. Will occur.

That is, the AP keeps down traffic for a plurality of terminal devices in a queue and attempts to transmit data from the downlink data packets that arrive first in a first-in first-out (FIFO) manner. If the first packet in the queue is for a terminal that has already moved to another AP and the AP does not know whether the terminal has moved, the AP continues to attempt to retransmit the packet to the terminal. . This increases the latency of packets behind the queue, which in turn reduces system throughput. In particular, the situation where the users who do not move due to the mobile users to feel the performance degradation of the wireless LAN will be a problem situation that must be solved in terms of user quality for the operator managing the network.

Accordingly, in the present invention, in a wireless data service environment without a separate controller device, a problem of system throughput degradation caused by retransmission of downlink traffic that is not transmitted to the terminal device before the mobile device is moved to the terminal device when moving between the wireless relay devices of the terminal device. Considering this, we propose a method to minimize system throughput degradation through downlink traffic control.

The present invention has been made in view of the above circumstances, and an object of the present invention is to connect a device to another wireless relay device corresponding to a terminal device when a predefined device connection movement event occurs during connection with a specific wireless relay device. Requesting movement and access, and if a predetermined downlink transmission situation occurs when the downlink data packet is transmitted to the terminal apparatus to which the specific wireless relay apparatus is previously connected, the terminal apparatus is managed as a quasi-connection state terminal, and the downlink data is transmitted. When the packet is received, traffic control for a wireless data service storing the downlink data packet in the quasi-connected packet storage area or transmitting the downlink data packet to the terminal device according to whether the packet is a downlink data packet to the terminal device managed as the quasi-connection state terminal. Providing a system and method, the wireless relay device based on the occurrence of a predefined downlink transmission situation The roaming terminal is effectively roamed by managing the roaming terminal device as a quasi-connection state terminal and storing it in a quasi-connection packet storage area when receiving downlink data packets to the quasi-connection state terminal. This is to prevent the occurrence of a problem of system throughput degradation by retransmitting downlink traffic that cannot be delivered to the terminal device.

The present invention has been made in view of the above circumstances, and another object of the present invention is to determine whether a predetermined downlink transmission situation occurs when transmitting a downlink data packet to a connected terminal device and determine the downlink transmission. When a failure occurs, the terminal device is managed as a quasi-connected state terminal, and when a downlink data packet is received, the quasi-connected packet is stored according to whether the downlink data packet is a downlink data packet to the terminal device managed as the quasi-connected state terminal. By providing a method of operating a wireless relay device and a wireless relay device stored in an area or transmitted to a corresponding terminal device, a problem of system throughput degradation due to retransmission of downlink traffic that cannot be delivered to a roaming terminal device is prevented. To support the environment.

Traffic control system for a wireless data service according to the first aspect of the present invention for achieving the above object, the device connection to the corresponding other wireless relay device when a predefined device connection movement event occurs during connection with a specific wireless relay device A terminal device requesting movement; And managing a terminal device as a quasi-connection state terminal when a predetermined downlink transmission situation occurs when the downlink data packet is transmitted to the connected terminal device. When the downlink data packet is received, the terminal device is managed as the quasi-connection state terminal. And a wireless relay device for storing the downlink data packet in the quasi-connected packet storage area or transmitting the downlink data packet to the terminal device according to whether the data packet is a downlink data packet to the terminal device.

A wireless relay apparatus according to a second aspect of the present invention for achieving the above object, the failure situation determination unit for determining whether a predetermined downlink transmission failure occurs when transmitting a downlink data packet to a connected terminal device; A quasi-connection state management unit that manages the terminal device as a quasi-connection state terminal when the downlink transmission failure occurs; And a relay controller configured to store the downlink data packet in the quasi-connected packet storage area or transmit the downlink data packet to the terminal device according to whether the downlink data packet is received or not as a downlink data packet to the terminal device managed as the quasi-connection state terminal. Include.

Preferably, the quasi-connection state management unit stores the terminal identification information corresponding to the terminal device in the quasi-connection terminal information, if the generated quasi-connection terminal information exists when the downlink transmission failure occurs. If the generated quasi-connected terminal information does not exist, quasi-connected terminal information including terminal identification information corresponding to the terminal device may be generated and stored.

Preferably, if the quasi-connection terminal information is present, the relay controller may determine whether the received downlink data packet is a downlink data packet to the terminal device managed as the quasi-connection state terminal.

Preferably, the relay controller determines whether the received downlink data packet corresponds to the terminal identification information included in the quasi-connected terminal information, and if the corresponding downlink data packet corresponds to the terminal identification information included in the quasi-connected terminal information. The data packet may be stored in the quasi-connected packet storage area, and if the data packet does not correspond to the terminal identification information included in the quasi-connected terminal information, the downlink data packet may be stored in a specific packet transmission standby area to transmit the downlink data packet to a corresponding terminal device. .

Preferably, the quasi-connection state management unit, if there is a terminal device that is maintained for more than a predetermined quasi-connection state holding time as the quasi-connection state terminal, the terminal identification information of at least one terminal device managed by the quasi-connection state terminal In the quasi-connected terminal information to be stored, the terminal identification information of the terminal device maintained for more than the quasi-connection state holding time may be deleted to recognize the terminal device as the disconnected terminal.

Preferably, the relay controller may delete the downlink data packet to the terminal device recognized as the disconnect terminal from the quasi-connect packet storage area.

Preferably, the quasi-connection state management unit, when the uplink data packet is received from the terminal device managed as the quasi-connection state terminal, the quasi-connection terminal for storing the terminal identification information of at least one terminal device managed by the quasi-connection state terminal. The terminal may be recognized as a connection terminal by deleting terminal identification information of the terminal device corresponding to the uplink data packet from the information.

Preferably, the relay controller may be configured to move the downlink data packet to the terminal device recognized as the connection terminal from the quasi-connection packet storage area to the packet transmission standby area.

Traffic control method for a wireless data service according to a third aspect of the present invention for achieving the above object, the other wireless relay device corresponding to the terminal device when a predefined device connection movement event occurs during connection with a specific wireless relay device Requesting a device connection movement to connect; Managing the terminal device as a quasi-connection state terminal when a predetermined downlink transmission situation occurs when the downlink data packet is transmitted to the terminal device to which the specific wireless relay device is previously connected; And when the specific wireless relay device receives the downlink data packet, the downlink data packet is stored in the quasi-connected packet storage area according to whether the downlink data packet is transmitted to the terminal device managed as the quasi-connected state terminal, or to the terminal device. Transmitting.

In the operation method of the wireless relay apparatus according to the fourth aspect of the present invention for achieving the above object, a failure situation determination step of determining whether or not a predetermined downlink transmission situation occurs when transmitting a downlink data packet to the connected terminal device; ; A quasi-connection state management step of managing a corresponding terminal device as a quasi-connection state terminal when the downlink transmission failure occurs; And receiving the downlink data packet, storing the downlink data packet in the quasi-connected packet storage area or transmitting the downlink data packet to the terminal device according to whether the downlink data packet is transmitted to the terminal device managed as the quasi-connection state terminal. It includes.

Preferably, in the quasi-connected state management step, when the downlink transmission situation occurs, if there is already generated quasi-connected terminal information, the terminal identification information corresponding to the terminal device is stored in the quasi-connected terminal information. And generating and storing quasi-connected terminal information including terminal identification information corresponding to the terminal apparatus if the generated quasi-connected terminal information does not exist when the downlink transmission failure occurs.

Preferably, in the relay control step, when the quasi-connection terminal information exists, it may be determined whether the received downlink data packet is a downlink data packet to the terminal device managed as the quasi-connection state terminal.

Preferably, the relaying control step determines whether the received downlink data packet corresponds to the terminal identification information included in the quasi-connected terminal information, and if it corresponds to the terminal identification information included in the quasi-connected terminal information. Storing the downlink data packet in the quasi-connected packet storage region; and if the downlink data packet does not correspond to the terminal identification information included in the quasi-connected terminal information, the downlink data packet is transmitted to a specific packet transmission standby region to transmit the downlink data packet to a corresponding terminal device. It may include storing in.

Preferably, if there is a terminal device that is maintained for a predetermined quasi-connection state holding time or more as the quasi-connection state terminal, the quasi-connection terminal information for storing the terminal identification information of at least one terminal device managed by the quasi-connection state terminal. The method may further include recognizing the terminal device as a disconnection terminal by deleting the terminal identification information of the terminal device maintained for more than the quasi-connection state holding time.

Preferably, the relay control unit may further include deleting a downlink data packet to the terminal device recognized as the disconnect terminal from the quasi-connect packet storage area.

Preferably, when the uplink data packet is received from the terminal device managed as the quasi-connection state terminal, the uplink data packet in the quasi-connection terminal information storing the terminal identification information of at least one terminal device managed as the quasi-connection state terminal. The method may further include recognizing the terminal device as a connection terminal by deleting terminal identification information of the terminal device corresponding to the terminal.

Preferably, the method may further include moving a downlink data packet to the corresponding terminal device recognized as the connection terminal from the quasi-connection packet storage area to the packet transmission standby area and storing the data packet.

Accordingly, according to the traffic control system and method for a wireless data service of the present invention, a wireless relay device effectively manages a terminal device roamed to another wireless relay device as a quasi-connection state terminal based on a predefined downlink transmission situation. When the downlink data packet is received to the quasi-connection state terminal, it is stored in a separate quasi-connection packet storage area and does not attempt to transmit it. Thus, the system throughput is reduced due to retransmission of downlink traffic that cannot be delivered to the roaming terminal device. The occurrence of the situation can be prevented in advance.

Therefore, according to the traffic control system and method for a wireless data service of the present invention, in the environment without a separate controller device, when the radio relay device of the terminal device is moved between the mobile terminal connected before the movement is not transmitted to the terminal device Considering the problem of system throughput deterioration due to retransmission of traffic, downlink traffic control can minimize system throughput deterioration.

1 is a block diagram showing a traffic control system for a wireless data service according to a preferred embodiment of the present invention.
2 is a block diagram showing the configuration of a wireless relay apparatus according to a preferred embodiment of the present invention.
3 is a flowchart illustrating a control flow of a traffic control method for a wireless data service according to a preferred embodiment of the present invention.
4 is a flowchart illustrating a process of managing quasi-connected terminal information in a method of operating a wireless relay apparatus according to an exemplary embodiment of the present invention.
5 is a flowchart illustrating a downlink data packet control process in a method of operating a wireless relay apparatus according to an exemplary embodiment of the present invention.
6 is a flowchart illustrating a quasi-connected terminal state switching process in a method of operating a wireless relay apparatus according to an exemplary embodiment of the present invention.

Hereinafter, preferred embodiments of the present invention will be described with reference to the accompanying drawings.

1 is a diagram illustrating a traffic control system for a wireless data service according to a preferred embodiment of the present invention.

As shown in FIG. 1, in the traffic control system for a wireless data service according to the present invention, when a predefined device connection movement event occurs during a connection with a specific wireless relay device A 200, another wireless relay corresponding to the corresponding traffic relaying event occurs. The terminal device 10 requesting the device connection movement to the device B 300 and the terminal device 10 when a predefined downlink transmission situation occurs in response to the transmission of the downlink data packet to the connected terminal device 10. When the downlink data packet is received and the downlink data packet is received, the downlink data packet is stored in the quasi-connected packet storage area according to whether the downlink data packet is transmitted to the terminal device 10 managed as the quasi-connected state terminal. It includes a wireless relay device A (200) for transmitting to the terminal device (for example 20).

The traffic control system for a wireless data service according to the present invention includes a plurality of wireless relay devices, and as an example, will be described by referring to / showing the wireless relay device A 200 and the wireless relay device B 300.

The terminal devices 10, 20... Are terminals that can use a wireless data service by accessing a specific wireless relay device, accessing a WLAN network through the wireless relay device, and accessing the wireless Internet through the terminal device. For convenience of description, the terminal devices 10, 20... Will be referred to as being connected to the wireless relay device A 200.

That is, when the terminal device 10, 20... Generally wants to use a wireless data service, the terminal device 10 is connected to a wireless relay device (for example, the wireless relay device A 200) located at the shortest distance. The wireless network may be connected to the WLAN network through the wireless network A 200 and the wireless Internet through the wireless relay A 200.

For example, the terminal device 10, 20... Selects an optimal wireless relay device A 200 based on the signal strength with neighboring wireless relay devices and sends an Association Request message to the wireless relay device A. If the wireless relay device A 200 responds by sending an association response message by transmitting the connection to the mobile station 200, the connection between the terminal device 10, 20... And the wireless relay device A 200 is terminated. Is done.

And, since the terminal device (10, 20 ...) does not have its own IP address when connecting to the wireless relay device A (200), it provides a DHCP Request message to the wireless relay device A (200) to request an IP address. If the wireless relay device A 200 responds by replying with a DHCP response message including the IP address, the terminal device 10, 20... Receives an IP address. At this time, the terminal devices 10, 20, ... also receive the IP address for the default gateway (G / W).

After that, if the terminal device 10, 20 ... wants to use the wireless data service by executing an application such as an Internet browser, the terminal device 10, 20 ... prepares to provide a data packet to a default gateway. That is, since the terminal apparatuses 10 and 20 do not know the MAC address of the gateway, they request the MAC address of the IP address of the gateway through an ARP Request message. Since the wireless relay device A 200 is a gateway, the wireless relay device A 200 responds to the terminal device with an ARP Response message including BSSID (Basic Service Set Identifier) 1, which is its MAC address.

Accordingly, the terminal apparatuses 10, 20, ... store the IP address and the MAC address of the gateway in the gateway address information table, that is, the ARP table, and the terminal apparatuses 10, 20, ... On the other hand, a data packet having a Destination MAC address field set to BSSID1, a Source MAC address field set to its own MAC address, and a BSSID field set to BSSID1 is generated and transmitted / transmitted to the wireless relay device A200.

As such, a situation in which a specific terminal device 10 moves toward the wireless relay device B 300 among the plurality of terminal devices 100 connected to the wireless relay device A 200 may occur.

Accordingly, the terminal device 10, when a predefined device connection movement event occurs, requests the device connection movement to the other wireless relay device B 300 corresponding thereto.

That is, when the terminal device 10 moves toward the wireless relay device B 300 in a situation in which the terminal device 10 is connected to the wireless relay device A 200, the signal strength of the wireless relay device B 300 is increased by the wireless relay device A 200. A situation occurs that becomes larger than the signal strength of, and this occurrence can be recognized as a device connection movement event occurrence.

When the device connection movement event occurs as described above, the terminal device 10 requests a device connection movement, that is, roaming, by sending a reassociation request message to the corresponding wireless relay device 300, and thus, the wireless relay device B ( When the 300 responds by replying to the Reassociation Response message, the connection between the terminal apparatus 10 and the radio relay apparatus B 300 is established. As such, the device connection movement procedure when roaming from the wireless relay device A 200 to the wireless relay device B 300 by the movement of the terminal device 10 will be the same as the existing method.

However, when the terminal device 10 roams to the wireless relay device B 300, the terminal device 10 does not go through a disconnection (or disassociation) process with the wireless relay device A 200 connected before roaming to the wireless relay device B 300. Connection may occur.

That is, before the terminal device 10 connects to the wireless relay device B 300, the terminal device 10 transmits a disassociation request message to the wireless relay device 200 to request the disconnection, and thus the wireless relay device A 200 disassociates the response. In response to the message, the connection between the terminal device 10 and the wireless relay device A 200 is normally released. However, in roaming between wireless relay devices operating in a NAT method, a terminal device often moves without performing a disconnection process.

The wireless relay devices 200 and 300 are WLAN accesses as relay devices that support a plurality of terminal devices 100 to use wireless data services in a wireless data service system (for example, Wi-Fi, Wireless Fidelity) environment to which the present invention is applied. It may include a point (AP).

The wireless relay apparatuses 200 and 300 relay data traffic between a plurality of terminal apparatuses 100 connected thereto and an external specific data service server 400 so as to service uplink data packets from the plurality of terminal apparatuses 100. The terminal 400 transmits the downlink data packet returned from the data service server 400 to the corresponding terminal device 10, 20... And supports the plurality of terminal devices 100 to use the wireless data service. .

The wireless relay device A 200 and the wireless relay device B 300 may have the same configuration. Hereinafter, the wireless relay device A 200 will be described for convenience of description.

The wireless relay device A 200 connects the terminal device 10 to a quasi-connection state terminal (or a quasi-association state terminal) when a predetermined downlink transmission situation occurs in response to the downlink data packet transmission to the connected terminal device 10. When the downlink data packet is received, the downlink data packet is stored in the quasi-connect packet storage area according to whether the downlink data packet is transmitted to the terminal device 10 managed as the quasi-connection state terminal or the corresponding terminal device ( Ex: 20).

That is, the wireless relay device A (200), when receiving downlink data packets to a plurality of connected terminal device 100 in order to store them in a queue, that is, in the packet transmission standby area, and checks the packet transmission standby area, first-in-first-out Attempts to transmit downlink data packets in a (FIFO) manner. In this case, if there is a terminal device 10 roamed to another wireless relay device B 300 without performing a normal disconnection (or disassociation) process as described above, the wireless relay device A 200 that does not recognize this fact is present. Attempt to send the downlink data packet to the terminal device 10 will fail.

The wireless relay device A 200 manages the terminal device 10 as a quasi-connection state terminal when a predetermined downlink transmission situation occurs in response to the downlink data packet transmission to the specific terminal device 10 as described above. .

When the downlink data packet is received from the data service server 400, the wireless relay device A 200 determines whether the downlink data packet received this time is a downlink data packet to the terminal device 10 managed as the quasi-connection state terminal. Judge.

In this case, if the received downlink data packet is a downlink data packet to the terminal device 10 managed as the quasi-connected state terminal, the wireless relay device A 200 stores the downlink data packet in the quasi-connected packet storage area. No attempt will be made to transmit to the terminal device 10.

Meanwhile, if the downlink data packet received this time is not the downlink data to the terminal device 10 managed as the quasi-connection state terminal, the wireless relay device A 200 transmits the downlink data packet to the corresponding terminal device (eg, 20). Will be sent). That is, the wireless relay device A 200 stores the downlink data packets in a queue, that is, in the packet transmission standby area, examines the packet transmission waiting area, and attempts to transmit the downlink data packet by the first in, first out (FIFO) method. The downlink data packet may be transmitted to the corresponding terminal device 20.

Hereinafter, a detailed configuration of a wireless relay apparatus according to the present invention will be described with reference to FIG. 2. For convenience of description, the reference numeral 200 of the wireless relay device A will be described.

The wireless relay apparatus 200 according to the present invention includes a failure situation determination unit 210 for determining whether a predetermined downlink transmission failure occurs in response to downlink data packet transmission to a connected terminal device, and the downlink transmission. When the failure occurs, the quasi-connection state management unit 220 for managing the terminal device as a quasi-connection state terminal, and if a downlink data packet is received, depending on whether or not the downlink data packet to the terminal device managed as the quasi-connection state terminal. It includes a relay control unit 230 for storing the downlink data packet in the quasi-connected packet storage area or transmits to the terminal device.

The failure situation determination unit 210 determines whether a predefined downlink transmission failure occurs in response to the downlink data packet transmission to the connected terminal device.

When the wireless relay device 200 receives the downlink data packets from the data service server 400 to the plurality of terminal devices 100 connected as described above, the wireless relay device 200 sequentially queues them to the packet transmission standby area 250. It stores and checks the packet transmission waiting area 250 and attempts to transmit the downlink data packet to the terminal device in a first-in first-out (FIFO) manner.

In other words, the relay controller 230 manages information on a plurality of connected terminal devices 100, and receives a downlink data packet from the data service server 400 to a specific terminal device and transmits it to a packet transmission standby area ( The data traffic relay, in particular, the downlink data traffic relay, which attempts to transmit the downlink data packet to the terminal device in a first-in-first-out (FIFO) manner by checking the packet transmission standby area 250 and transmitting the data to the terminal device.

The failure situation determination unit 210, through the data traffic relay process performed in the relay control unit 230, whether a predetermined downlink transmission failure situation occurs in response to the transmission of the downlink data packet to the connected terminal device; Can be determined.

For example, in IEEE 802.11, if one downlink data packet is retransmitted K times and all K times fail, the transmission of the data packet is stopped, the data packet is deleted from the queue, and the next data packet is removed. Attempt a transfer to.

Accordingly, the failure status determining unit 210 defines a case in which a case of stopping transmission attempt and data packet deletion occurs for N data packets consecutively corresponding to one terminal device as described above. It can be recognized that this has occurred.

The quasi-connection state management unit 220 manages the terminal device (eg, 10) as a quasi-connection state terminal (or quasi-association state terminal) when a downlink transmission failure occurs based on the determination of the failure situation determination unit 210. do.

More specifically, the quasi-connection state management unit 220, when the downlink transmission situation occurs, if there is already generated quasi-connection terminal information, the terminal identification information corresponding to the corresponding terminal device 10, the quasi-connection terminal information If the pre-generated semi-connected terminal information does not exist, the semi-connected terminal information including the terminal identification information corresponding to the terminal device 10 may be generated and stored.

That is, the quasi-connection state management unit 220, if it is recognized that the downlink transmission failure occurs in response to the downlink data packet transmission to the specific terminal device 10 based on the determination of the failure situation determination unit 210, It is determined whether there is already generated quasi-connected terminal information.

Accordingly, if the quasi-connection terminal information generated previously does not exist, the quasi-connection state management unit 220 determines the terminal identification information corresponding to the corresponding terminal device 10 in which the downlink transmission situation has occurred (eg, MAC address). By generating and storing the quasi-connected terminal information 225 including), the terminal device 10 can be managed as a quasi-connected state terminal.

On the other hand, the quasi-connection state management unit 220, if the quasi-connection terminal information 225 previously generated as a result of the determination, the terminal identification information corresponding to the corresponding terminal device 10 in which the downlink transmission situation occurred this time (for example: By storing the MAC address) in the quasi-connection terminal information 225, the terminal device 10 can be managed as a quasi-connection state terminal.

Accordingly, the quasi-connection state management unit 220 lists and stores / manages the quasi-connection terminal information 225 storing the terminal identification information for the terminal devices determined to be the quasi-connection state terminals, thereby providing the terminal apparatus in the quasi-connection state. It will manage information about the fields.

When the downlink data packet is received, the relay controller 230 stores the downlink data packet in the quasi-connect packet storage area 240 according to whether the downlink data packet is a downlink data packet to the terminal device 10 managed as the quasi-connection state terminal. Or transmit to the terminal device (eg 20).

In more detail, the relay controller 230 manages information on the plurality of terminal apparatuses 100 connected as described above, and receives a downlink data packet from the data service server 400 to a specific terminal apparatus. Data traffic relay, particularly downlink data, which is stored in the packet transmission standby area 250 and examines the packet transmission waiting area 250 and attempts to transmit the corresponding downlink data packet to the terminal device in a first-in first-out (FIFO) manner. Perform traffic relay.

When the quasi-connection terminal information 225 is present, the relay controller 230 may determine whether the received downlink data packet is a downlink data packet to the terminal device managed as the quasi-connection state terminal. Do.

That is, when the relay controller 230 receives the downlink data packet from the data service server 400 to the specific terminal device, the relay controller 230 first checks whether the quasi-connected terminal information 225 exists, and then quasi-connected terminal information 225. If there is no), the downlink data packet received this time will be stored in the packet transmission standby area 250 without performing a separate determination process. Accordingly, the relay controller 230 inspects the packet transmission standby area 250 by performing the data traffic relay as described above, and the corresponding terminal device for the corresponding downlink data packet in a first-in first-out (FIFO) method (eg, 10,20). ...)

On the other hand, when the relay control unit 230 receives the downlink data packet from the data service server 400 to a specific terminal device, first checks whether the quasi-connected terminal information 225 exists, and the quasi-connected terminal information 225. ), It is determined whether the downlink data packet received this time corresponds to the terminal identification information included in the quasi-connection terminal information 225, and whether the downlink data packet is a downlink data packet to the terminal device managed as the quasi-connection state terminal. can do. That is, the relay control unit 230, when the quasi-connection terminal information 225 is present, that is, when the quasi-connection state terminal of the access terminal device 100 that it manages, quasi-binding for the received downlink data packet As a connection state terminal, the terminal operates in an operation mode that determines whether it is a downlink data packet to the terminal device managed, that is, a quasi-connection mode.

As such, the relay controller 230 operating in the quasi-connected mode determines whether the received downlink data packet corresponds to the terminal identification information included in the quasi-connected terminal information 225. The downlink data packet is stored in the quasi-connected packet storage area 240 when it corresponds to the terminal identification information included, and the downlink data packet is specified when it does not correspond to the terminal identification information included in the quasi-connected terminal information 225. It is stored in the specific packet transmission standby area 250 to be transmitted to the terminal device (eg 20).

In this case, the relay controller 230 determines whether the terminal identification information corresponding to the destination included in the received downlink data packet corresponds to the terminal identification information included in the quasi-connected terminal information 225, thereby determining the downlink data packet. As a quasi-connection state terminal, it can be determined whether the data packet is a downlink data packet to the managed terminal device.

In other words, the relay controller 230 determines whether the received downlink data packet corresponds to the terminal identification information included in the quasi-connection terminal information 225, and thus the terminal identification information of the downlink data packet corresponds to the quasi-connection terminal information ( If it does not correspond to the terminal identification information included in 225, since the downlink data packet received this time is not the downlink data to the terminal device 10 managed as a quasi-connection state terminal, this downlink data packet is a specific terminal device corresponding to this time. (Eg, 20) to store in the packet transmission standby area 250, that is, queue.

Accordingly, the relay control unit 230, by performing the data traffic relay as described above will examine the packet transmission standby area 250 and transmits to the terminal device 20 for the downlink data packet in a first-in first-out (FIFO) method. .

Meanwhile, the relay controller 230 determines whether the received downlink data packet corresponds to the terminal identification information included in the quasi-connected terminal information 225, and the terminal identification information of the downlink data packet corresponds to the quasi-connected terminal information 225. If corresponding to the terminal identification information included in the), this time the downlink data packet is stored in the quasi-connected packet storage area 240 will not attempt to transmit to the terminal device (10).

In this case, the relay controller 230 may store only the maximum q data packets in the quasi-connection packet storage area 240 and discard more data packets.

Accordingly, in the wireless relay apparatus according to the present invention, a terminal device roamed by another wireless relay device is managed as a quasi-connection state terminal, and when receiving a downlink data packet to the quasi-connection state terminal, it is stored in a separate quasi-connection packet storage area. By not attempting the transmission, it is possible to prevent the occurrence of a problem of system throughput degradation by retransmitting downlink traffic that cannot be delivered to the terminal device.

Furthermore, the quasi-connection state management unit 220 deletes the terminal identification information corresponding to the terminal device maintained as the quasi-connection state terminal for more than a predetermined quasi-connection state holding time from the quasi-connection terminal information 225 to remove the terminal device. It can be recognized as a disconnect terminal.

That is, the quasi-connection state management unit 220, in continuously managing the quasi-connection terminal information 225, the terminal devices corresponding to each terminal identification information included / stored in the quasi-connection terminal information 225 is set in advance Determines whether the quasi-connection stays longer than. Thus, the quasi-connection state management unit 220, if the terminal identification information contained / stored in the quasi-connection terminal information 225 or more than the preset quasi-connection state holding time, the corresponding terminal identification information in the quasi-connection terminal information (225) By deleting it, the corresponding terminal device (eg, 10) can be recognized / determined that the terminal is completely connected / disconnected, that is, disconnected terminal.

Accordingly, the relay controller 230 may delete the downlink data packet to the terminal device 10 recognized as the disconnection terminal by the quasi-connection state management unit 220 from the quasi-connection packet storage area 240.

On the other hand, the quasi-connection state management unit 220, if the uplink data packet is received, if the received uplink data packet corresponds to the terminal identification information included in the quasi-connection terminal information 225, the quasi-connection terminal information In step 225, the terminal may be recognized as a connection terminal.

That is, the quasi-connection state management unit 220, in continuously managing the quasi-connection terminal information 225, the terminal device corresponding to each terminal identification information included / stored in the quasi-connection terminal information 225 (for example, 10) It is determined whether an uplink data packet is received from the controller.

For example, the quasi-connection state management unit 220 determines whether the uplink data packet received from the terminal device corresponds to the terminal identification information included in the quasi-connection terminal information 225 through interworking with the relay controller 230. As a result, it is possible to determine / recognize whether an uplink data packet from the terminal device 10 managed as the quasi-connection state terminal is received.

Alternatively, the quasi-connection state management unit 220 transmits a request to send (RTS) for each preset confirmation period T1 with respect to the terminal device 10 included in the quasi-connection terminal information 225, thereby responding to the response CTS ( If a Clear To Send) is returned, it can be recognized that the uplink data packet is received from the corresponding terminal device 10, that is, the terminal device 10 managed as the quasi-connection state terminal.

As such, the quasi-connection state management unit 220, when the received uplink data packet corresponds to the terminal identification information included in the quasi-connection terminal information 225, that is, uplink data from the terminal device 10 managed as a quasi-connection state terminal When the packet is received, the corresponding terminal device 10 may be recognized / determined that the corresponding terminal device 10 is normally connected / connected by deleting the terminal identification information from the quasi-connection terminal information 225.

Accordingly, the relay controller 230 transmits the downlink data packet to the terminal device 10 recognized as the connection terminal by the quasi-connection state management unit 220 from the quasi-connection packet storage area 240 to the packet transmission standby area 250. You can move it to and save it. Accordingly, the relay controller 230 may check the packet transmission standby area 250 by performing data traffic relay as described above, and transmit the packet to the corresponding terminal device 10 for the downlink data packet in a first-in first-out (FIFO) method. .

In this case, the quasi-connection state management unit 220, as described above, in response to the case where the connection from the quasi-connection terminal disconnected or switched / recognized as a specific terminal identification information is removed from the quasi-connection terminal information (225) If there is no terminal identification information in the connection terminal information 225, the quasi-connection state management unit 220 may delete the quasi-connection terminal information (225).

In addition, if the quasi-connection terminal information 225 is not deleted / exists as described above, the relay controller 230 will stop operating in the quasi-connection mode described above. Accordingly, the relay controller 230 may store the downlink data packet in the packet transmission standby area 250 as before without performing a separate determination process on the received downlink data packet.

As described above, the traffic control system for a wireless data service according to the present invention effectively manages a terminal device roamed to another wireless relay device as a quasi-connected state terminal based on occurrence of a predefined downlink transmission situation. When the downlink data packet is received by the quasi-connection state terminal, it is stored in a separate quasi-connection packet storage area and does not attempt to transmit it. Therefore, the system throughput is reduced by retransmitting downlink traffic that cannot be delivered to the roaming terminal device. Problem occurrence can be prevented in advance.

Therefore, the traffic control system for a wireless data service according to the present invention, in the environment that does not have a separate controller device, the downlink traffic that is not transmitted to the terminal device when the wireless relay device before the movement when moving between the wireless relay device of the terminal device; Considering the problem of system throughput deterioration due to retransmission, it is possible to minimize system throughput deterioration through downlink traffic control.

Hereinafter, a traffic control method for a wireless data service according to a preferred embodiment of the present invention will be described with reference to FIGS. 3 to 6. Here, for convenience of explanation, the configurations shown in FIGS. 1 and 2 will be described with reference to corresponding reference numerals.

First, a traffic control method for a wireless data service according to a preferred embodiment of the present invention will be described with reference to FIG. 3.

The terminal devices 10, 20... Are terminals that can use a wireless data service by accessing a specific wireless relay device, accessing a WLAN network through the wireless relay device, and accessing the wireless Internet through the terminal device. For convenience of description, the terminal devices 10, 20... Will be referred to as being connected to the wireless relay device A 200.

That is, when the terminal device 10, 20... Generally wants to use a wireless data service, the terminal device 10 is connected to a wireless relay device (for example, the wireless relay device A 200) located at the shortest distance. The wireless network may be connected to the WLAN network through the wireless network A 200 and the wireless Internet through the wireless relay A 200.

The wireless relay device A 200 relays data traffic between a plurality of connected terminal devices 10 and 20 and an external specific data service server 400 (S10), thereby providing a plurality of terminal devices 10 and 20. The uplink data packet from the data service server 400 is transmitted, and the downlink data packet returned from the data service server 400 is transmitted to the corresponding terminal device (10, 20 ...) to the plurality of terminal devices (10,20). ) To use the wireless data service.

In this case, when the wireless relay device A 200 is connected to the wireless relay device B 300, the signal strength of the wireless relay device 300 becomes greater than the signal strength of the wireless relay device A 200. The terminal device A 10 is placed in a situation in which the situation is recognized as a device connection movement event occurrence, and correspondingly to the corresponding wireless relay device B 300 by requesting / connecting the device connection movement to the wireless relay device B ( 300 may be roamed (S20).

However, when the terminal device A 10 roams to the wireless relay device B 300, the wireless relay device B 300 does not undergo a connection (or disassociation) process with the wireless relay device A 200 connected before roaming. Connection may occur.

The wireless relay device A 200 transmits the corresponding terminal device (eg, 10) to a quasi-connection state terminal when a predetermined downlink transmission situation occurs in response to the downlink data packet transmission to the connected terminal devices 10 and 20. Or quasi-associated state terminal).

That is, the wireless relay device A (200), if the downlink data packets to the plurality of terminal devices (10, 20) connected to the transmission / reception from the data service server 400 (S30), in order to queue them, that is, packet transmission Stored in the waiting area, and checks the packet transmission waiting area and attempts to transmit the downlink data packet in a first-in first-out (FIFO) method (S40). At this time, if there is a terminal device A 10 roamed to another wireless relay device B 300 without performing a normal disconnection (or disassociation) process as described above, the wireless relay device A (not aware of this fact) ( At 200, the downlink data packet transmission attempted to the terminal device A 10 will fail.

The wireless relay device A 200 quasi-connects the corresponding terminal device A 10 when a predetermined downlink transmission situation occurs in response to the downlink data packet transmission to the specific terminal device A 10 as described above (S50). It manages as a state terminal (S60).

When the downlink data packet is received (S70), the wireless relay device A200 determines whether the downlink data packet is a downlink data packet to the terminal device A10 managed as the quasi-connection state terminal (S60). It is stored in the quasi-connection packet storage area (S95) or transmitted to the terminal device (for example, 20) (D90).

That is, when the downlink data packet is received from the data service server 400, the wireless relay device A 200 determines whether the downlink data packet received this time is the downlink data packet to the terminal device A 10 managed as the quasi-connection state terminal. Determine whether or not.

In this case, the wireless relay device A 200 stores the downlink data packet in the quasi-connect packet storage area when the received downlink data packet is a downlink data packet to the terminal device A 10 managed as the quasi-connection state terminal. It will not attempt to transmit to the terminal device A (10).

Meanwhile, if the downlink data packet received this time is not the downlink data to the terminal device A 10 managed as the quasi-connection state terminal, the wireless relay device A 200 transmits the downlink data packet to the corresponding terminal device (eg, 20) will send. That is, the wireless relay device A 200 stores the downlink data packets in a queue, that is, in the packet transmission standby area, examines the packet transmission waiting area, and attempts to transmit the downlink data packet by the first in, first out (FIFO) method. The downlink data packet may be transmitted to the terminal device B 20.

Hereinafter, an operation method of the wireless relay apparatus according to the present invention will be described in more detail with reference to FIGS. 4 to 6.

First, the quasi-connection terminal information management process in the operating method of the wireless relay apparatus according to the present invention will be described with reference to FIG. 4.

Operation method of the wireless relay device 200 according to the present invention, by relaying the data traffic between the plurality of terminal devices (10, 20) and the external specific data service server 400 is connected (S100), a plurality of terminals The uplink data packets from the devices 10 and 20 are transferred to the data service server 400 and the downlink data packets returned from the data service server 400 are transmitted to the corresponding terminal devices 10, 20 ... The terminal 10, 20 supports to use a wireless data service.

That is, in the operation method of the wireless relay apparatus 200 according to the present invention, when downlink data packets to a plurality of connected terminal apparatuses 10 and 20 are received from the data service server 400, the packets are sequentially queued, that is, packets. Store in the transmission standby area (250).

Accordingly, in the method of operating the wireless relay device 200 according to the present invention, the packet transmission standby area 250 is examined to transmit / transmit the downlink data packet to the corresponding terminal device (10, 20 ...) (S110). In step S120, a first-in, first-out (FIFO) method attempts to transmit the downlink data packet to the corresponding terminal device.

At this time, the operation method of the wireless relay apparatus 200 according to the present invention, through the above-described data traffic relay process (S110, S120), the downlink transmission failure predefined in response to the downlink data packet transmission to the connected terminal device It may be determined whether a situation occurs (S130).

For example, in IEEE 802.11, if one downlink data packet is retransmitted K times and all K times fail, the transmission of the data packet is stopped, the data packet is deleted from the queue, and the next data packet is removed. Attempt a transfer to.

Therefore, the operation method of the wireless relay apparatus 200 according to the present invention is a case where the case of the transmission attempt cancellation and data packet deletion occurs as described above for N data packets consecutively corresponding to one terminal device. It can be recognized that a defined downlink transmission situation has occurred.

Accordingly, in the method of operating the wireless relay apparatus 200 according to the present invention, when the downlink transmission failure does not occur based on the determination of step S130, the N data packets are continuously described corresponding to one terminal device. In this case, since the transmission attempt is not stopped and the data packet is deleted, the current data packet transmission attempt is repeated (S120) or the packet transmission is performed in step S110, depending on whether or not the attempted transmission is successful (S135). The wait area 250 will be examined and an attempt will be made to transmit the next data packet.

On the other hand, the operation method of the wireless relay device 200 according to the present invention, based on the determination of the step S130, when a downlink transmission failure occurs, the corresponding terminal device (eg 10) quasi-connection state terminal (or quasi-associated state) Terminal).

In more detail, the operation method of the wireless relay apparatus 200 according to the present invention determines whether there is already generated quasi-connected terminal information when a downlink transmission failure occurs based on the determination of step S130 (S140). If there is already generated quasi-connected terminal information, the terminal identification information corresponding to the corresponding terminal device 10 is included and stored in the quasi-connected terminal information (S150). It is possible to generate and store quasi-connected terminal information including the terminal identification information corresponding to the device 10 (S160).

That is, in the operation method of the wireless relay device 200 according to the present invention, if it is recognized that a downlink transmission situation occurs in response to the downlink data packet transmission for a specific terminal device 10, the quasi-connected terminal is first generated. Determine whether information exists.

Accordingly, in the operation method of the wireless relay apparatus 200 according to the present invention, if the quasi-connected terminal information generated as a result of the determination does not exist, the terminal identification corresponding to the corresponding terminal apparatus 10 in which the downlink transmission situation has occurred this time. By generating and storing quasi-connection terminal information 225 including information (eg, MAC address), the terminal device 10 can be managed as a quasi-connection state terminal.

On the other hand, in the operation method of the wireless relay device 200 according to the present invention, if the quasi-connected terminal information 225 previously generated as a result of the determination, this corresponds to the terminal device 10 in which the downlink transmission situation occurs this time. By including and storing terminal identification information (eg, MAC address) in the quasi-connection terminal information 225, the terminal device 10 can be managed as a quasi-connection state terminal.

Thus, the operation method of the wireless relay device 200 according to the present invention, by storing the terminal identification information for the terminal devices that are determined to be the quasi-connection state terminal in the quasi-connection terminal information 225 stored in the list by storing / managing In addition, the terminal manages information on the terminal devices in the quasi-connected state.

Hereinafter, a downlink data packet control process in a method of operating a wireless relay apparatus according to the present invention will be described with reference to FIG. 5.

In the operation method of the wireless relay apparatus 200 according to the present invention, when a downlink data packet is received, the downlink data packet is quasi-connected packet according to whether the downlink data packet is a downlink data packet to the terminal device 10 managed as a quasi-connection state terminal. The data is stored in the storage area 240 or transmitted to the corresponding terminal device (eg, 20).

More specifically, the operation method of the wireless relay apparatus 200 according to the present invention manages information on the plurality of terminal apparatuses 100 connected as described above, and the specific terminal apparatus from the data service server 400. When the downlink data packet is received, the packet is stored in the packet transmission waiting area 250 and the packet transmission waiting area 250 is examined and attempted to transmit the downlink data packet to the corresponding terminal device in a first-in first-out (FIFO) method. Data traffic relaying, in particular, downlink data traffic relaying.

As described above, when the quasi-connected terminal information 225 is present, the operation method of the wireless relay apparatus 200 according to the present invention includes downlink data to a terminal device in which the received downlink data packet is managed as the quasi-connected state terminal. It is desirable to determine whether it is a packet.

That is, in the operation method of the wireless relay device 200 according to the present invention, when a downlink data packet is received from the data service server 400 to a specific terminal device (S170), whether the quasi-connection terminal information 225 exists. Check first (S180), if the quasi-connection terminal information 225 does not exist, it will store the downlink data packet received this time in the packet transmission standby area 250 as described above without performing a separate determination process (S185). ). Accordingly, in the method of operating the wireless relay apparatus 200 according to the present invention, by performing the data traffic relay as described above, the packet transmission standby region 250 is inspected to correspond to the corresponding downlink data packet in a first-in first-out (FIFO) method. Will be sent to the terminal (e.g. 10,20 ...).

On the other hand, in the operation method of the wireless relay device 200 according to the present invention, if a downlink data packet is received from the data service server 400 to a specific terminal device, first check whether the quasi-connection terminal information 225 is present. If the quasi-connected terminal information 225 is present, the terminal device managed as the quasi-connected state terminal by determining whether the downlink data packet received this time corresponds to the terminal identification information included in the quasi-connected terminal information 225. It may be determined whether the data packet is a downlink (S190). That is, in the method of operating the wireless relay device 200 according to the present invention, when the quasi-connection terminal information 225 exists, that is, the quasi-connection state terminal among the access terminal apparatuses 10 and 20 managed by the user exists. In this case, the received downlink data packet is operated in an operation mode that determines whether it is a downlink data packet to a terminal device managed as a quasi-connection state terminal, that is, in a quasi-connection mode.

As described above, the operation method of the wireless relay apparatus 200 according to the present invention operating in the quasi-connection mode determines whether the received downlink data packet corresponds to the terminal identification information included in the quasi-connection terminal information 225 ( S190), if corresponding to the terminal identification information included in the quasi-connected terminal information 225, the downlink data packet is stored in the quasi-connected packet storage area 240 (S200), the terminal included in the quasi-connected terminal information (225) If the identification information does not correspond, the downlink data packet is stored in the specific packet transmission standby area 250 to be transmitted to the specific terminal device (for example, 20) (S185).

In this case, the operation method of the wireless relay device 200 according to the present invention, whether the terminal identification information corresponding to the destination included in the received downlink data packet corresponds to the terminal identification information included in the quasi-connection terminal information 225. By judging, it can be determined whether the downlink data packet is the downlink data packet to the terminal device managed as the quasi-connection state terminal.

In other words, the operation method of the wireless relay apparatus 200 according to the present invention determines whether the received downlink data packet corresponds to the terminal identification information included in the quasi-connection terminal information 225, and thus, the terminal of the downlink data packet. If the identification information does not correspond to the terminal identification information included in the quasi-connection terminal information 225, since the downlink data packet received this time is not the downlink data to the terminal device 10 managed as the quasi-connection state terminal, this time downlink In order to transmit the data packet to a specific terminal device (for example, 20), it is stored in the packet transmission standby area 250, that is, the queue.

Accordingly, in the method of operating the wireless relay apparatus 200 according to the present invention, by performing the data traffic relay as described above, the packet transmission standby region 250 is inspected to correspond to the corresponding downlink data packet in a first-in first-out (FIFO) method. To the terminal device 20.

On the other hand, the operation method of the wireless relay device 200 according to the present invention, by determining whether the received downlink data packet corresponds to the terminal identification information included in the quasi-connection terminal information 225, the terminal identification of the downlink data packet If the information corresponds to the terminal identification information included in the quasi-connected terminal information 225, the downlink data packet will be stored in the quasi-connected packet storage area 240 so as not to attempt transmission to the terminal device 10.

Here, in the method of operating the wireless relay device 200 according to the present invention, only up to q data packets may be placed in the quasi-connection packet storage area 240 and more data packets may be discarded.

Hereinafter, with reference to Figure 6 to describe the quasi-connection terminal state switching process in the operating method of the wireless relay apparatus according to the present invention.

The operation method of the wireless relay apparatus 200 according to the present invention includes deleting terminal identification information corresponding to a terminal device maintained for a predetermined quasi-connection state holding time or more as a quasi-connection state terminal from the quasi-connection terminal information 225. A terminal can be recognized as a disconnect terminal.

That is, the operation method of the wireless relay device 200 according to the present invention includes a terminal corresponding to each terminal identification information included / stored in the quasi-connected terminal information 225 while continuously managing the quasi-connected terminal information 225. It is determined whether the devices are maintained for more than a predetermined quasi-connection state holding time (S210).

Thus, in the operation method of the wireless relay device 200 according to the present invention, if the terminal identification information included / stored in the quasi-connection terminal information 225 or more in a preset quasi-connection state holding time or more, the terminal identification information is semi-connected. The terminal device 225 may be deleted from the terminal information 225 to recognize / determine that the corresponding terminal device (eg, 10) is a fully connected / disconnected terminal, that is, a disconnected terminal (S220).

Accordingly, in the method of operating the wireless relay device 200 according to the present invention, the downlink data packet to the terminal device 10 recognized as the disconnected terminal device, that is, the disconnected terminal in step S220, is provided in the quasi-connected packet storage area 240. Can be deleted (S230).

On the other hand, in the operation method of the wireless relay device 200 according to the present invention, when the uplink data packet is received, if the received uplink data packet corresponds to the terminal identification information included in the quasi-connection terminal information 225, the terminal identification The information may be deleted from the quasi-connected terminal information 225 to recognize the terminal device as the connected terminal.

That is, the operation method of the wireless relay device 200 according to the present invention includes a terminal corresponding to each terminal identification information included / stored in the quasi-connected terminal information 225 while continuously managing the quasi-connected terminal information 225. It is determined whether an uplink data packet is received from the device (eg, 10) (S240).

For example, the operation method of the wireless relay apparatus 200 according to the present invention includes determining whether the uplink data packet received from the connected terminal apparatus corresponds to the terminal identification information included in the quasi-connection terminal information 225. The terminal may determine / recognize whether an uplink data packet from the terminal device 10 managed as the quasi-connection state terminal is received.

Or, the operation method of the wireless relay device 200 according to the present invention, by transmitting a request to send (RTS) for each preset confirmation period T1 for the terminal device 10 included in the quasi-connected terminal information 225, In response to this, when the response CTS (Clear To Send) is returned, it may be recognized that the uplink data packet is received from the corresponding terminal device 10, that is, the terminal device 10 managed as the quasi-connection state terminal.

As such, the operation method of the wireless relay device 200 according to the present invention includes a terminal device managed when the received uplink data packet corresponds to the terminal identification information included in the quasi-connection terminal information 225. When the uplink data packet is received from (10), the corresponding terminal device 10 may be recognized / determined that the corresponding terminal device 10 is normally connected / connected by deleting the corresponding terminal identification information from the quasi-connected terminal information 225 ( S250).

Thus, in the operation method of the wireless relay device 200 according to the present invention, the downlink data packet to the terminal device 10 recognized as the connection terminal in step WS250 in the quasi-connected packet storage area 240 in the packet transmission standby area ( 250 may be moved and stored (S260).

Accordingly, in the method of operating the wireless relay apparatus 200 according to the present invention, by performing the data traffic relay as described above, the packet transmission standby region 250 is inspected to correspond to the corresponding downlink data packet in a first-in first-out (FIFO) method. Will be sent to terminal 10.

Here, in the operation method of the wireless relay device 200 according to the present invention, the specific terminal identification information is quasi-connected terminal information 225 in response to the case where the quasi-connected terminal is disconnected from the quasi-connected terminal or switched / recognized as the connected terminal as described above. ), If there is no terminal identification information in the quasi-connected terminal information 225, the quasi-connected terminal information 225 may be deleted.

In addition, if the quasi-connection terminal information 225 is not deleted / exists as described above, the operation method of the wireless relay device 200 according to the present invention will stop operating in the quasi-connection mode described above. Thus, the operation method of the wireless relay apparatus 200 according to the present invention will store the downlink data packet in the packet transmission standby area 250 as before without performing a separate determination process on the received downlink data packet.

As described above, the traffic control method for a wireless data service according to the present invention effectively uses a terminal device roamed to another wireless relay device as a quasi-connected state terminal based on occurrence of a predefined downlink transmission situation. Management, and when receiving downlink data packets to the quasi-connection state terminal, it stores them in a separate quasi-connection packet storage area and does not attempt to transmit them. The problem situation can be prevented.

Therefore, the traffic control method for a wireless data service according to the present invention, in the environment that does not have a separate controller device, when moving between wireless relay devices of the terminal device to the downlink traffic that is not transmitted to the terminal device before the movement Considering the problem of system throughput deterioration due to retransmission, it is possible to minimize system throughput deterioration through downlink traffic control.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is to be understood that the invention is not limited to the disclosed exemplary embodiments, but, on the contrary, It will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention as defined by the appended claims.

Based on the occurrence of the predefined downlink transmission situation, the wireless relay device effectively manages the terminal device roamed with another wireless relay device as a quasi-connection state terminal, and stores the quasi-connection packet separately when receiving a downlink data packet to the quasi-connection state terminal. The present invention provides a traffic control system and method for a wireless data service which prevents a problem of a system throughput degradation caused by retransmission of downlink traffic that cannot be delivered to a roaming terminal device by not storing it in an area and attempting to transmit it. When applied, it is possible to make great progress in terms of improving network throughput, improving roaming communication quality, and user satisfaction, and the possibility of commercially available or sales of the applied radio relay and service solution is not only sufficient, but also realistically implemented.

10,20: terminal device 200,300: wireless relay device
400: data service server

Claims (18)

A terminal device requesting a device connection movement to another corresponding wireless relay apparatus when a predefined device connection movement event occurs during connection with a specific wireless relay apparatus; And
The terminal device is managed as a quasi-connection state terminal when a predefined downlink transmission situation occurs in response to the transmission of a downlink data packet to the terminal device that is previously connected. When the downlink data packet is received, the terminal device is managed as the quasi-connection state terminal. And a wireless relay device which stores the downlink data packet in a quasi-connected packet storage area or transmits the downlink data packet to a terminal device according to whether it is a downlink data packet to a terminal device. A failure situation determination unit for determining whether a predefined downlink failure situation occurs when transmitting a downlink data packet to a connected terminal device;
A quasi-connection state management unit that manages the terminal device as a quasi-connection state terminal when the downlink transmission failure occurs; And
When the downlink data packet is received, the relay controller may store the downlink data packet in the quasi-connected packet storage area or transmit the downlink data packet to the terminal device according to whether the downlink data packet is transmitted to the terminal device managed as the quasi-connection state terminal. Wireless repeater, characterized in that. The method of claim 2,
The quasi-connection state management unit,
When the downlink transmission failure occurs, if the quasi-connected terminal information generated previously exists, the terminal identification information corresponding to the terminal device is included in the quasi-connected terminal information and stored. If the quasi-connected terminal information does not exist previously, And generating and storing quasi-connection terminal information including terminal identification information corresponding to the terminal apparatus. The method of claim 3, wherein
The relay control unit,
And if the quasi-connected terminal information is present, determining whether the received downlink data packet is a downlink data packet to a terminal device managed as the quasi-connected state terminal. The method according to claim 3 or 4,
The relay control unit,
It is determined whether the received downlink data packet corresponds to the terminal identification information included in the quasi-connected terminal information. If the corresponding downlink data packet corresponds to the terminal identification information included in the quasi-connected terminal information, the downlink data packet is stored in the quasi-connected packet. And storing the data packet in a specific packet transmission standby area so as to transmit the downlink data packet to a specific terminal device if the terminal data is stored in an area and it does not correspond to the terminal identification information included in the quasi-connected terminal information. The method of claim 2,
The quasi-connection state management unit,
If there is a terminal device which is maintained as a quasi-connection state terminal for a preset quasi-connection state holding time, the quasi-connection state is maintained in the quasi-connection terminal information storing the terminal identification information of at least one terminal device managed by the quasi-connection state terminal. And deleting the terminal identification information of the terminal device maintained for more than a time, thereby recognizing the terminal device as a disconnection terminal. The method according to claim 6,
The relay control unit,
And deleting the downlink data packet to the corresponding terminal device recognized as the disconnection terminal from the quasi-connect packet storage area. The method of claim 2,
The quasi-connection state management unit,
When the uplink data packet is received from the terminal device managed as the quasi-connection state terminal, the terminal corresponding to the uplink data packet in the quasi-connection terminal information storing the terminal identification information of at least one terminal device managed as the quasi-connection state terminal. And deleting the terminal identification information of the device to recognize the terminal device as a connection terminal. The method of claim 8,
The relay control unit,
And storing the downlink data packet to the corresponding terminal device recognized as the connection terminal from the quasi-connection packet storage area to a specific packet transmission standby area. Requesting, by the terminal device, requesting device connection movement to another corresponding wireless relay apparatus when a predefined device connection movement event occurs during connection with a specific wireless relay apparatus;
Managing the terminal device as a quasi-connection state terminal when a predetermined downlink transmission situation occurs when the downlink data packet is transmitted to the terminal device to which the specific wireless relay device is previously connected; And
When the specific wireless relay device receives the downlink data packet, the downlink data packet is stored in the quasi-connected packet storage area or transmitted to the terminal device according to whether the downlink data packet is a downlink data packet to the terminal device managed as the quasi-connection state terminal. Traffic control method for a wireless data service comprising the steps of. A failure situation determination step of determining whether a predefined downlink failure situation occurs when transmitting a downlink data packet to a connected terminal device;
A quasi-connection state management step of managing a corresponding terminal device as a quasi-connection state terminal when the downlink transmission failure occurs; And
When the downlink data packet is received, a relay control step of storing the downlink data packet in the quasi-connected packet storage area or transmitting the downlink data packet to the terminal device according to whether the downlink data packet is transmitted to the terminal device managed as the quasi-connection state terminal. Operation method of a wireless relay device comprising a. The method of claim 11,
The quasi-connection state management step,
Storing the terminal identification information corresponding to the terminal device in the quasi-connected terminal information when the generated quasi-connected terminal information exists when the downlink transmission failure occurs;
And generating and storing quasi-connected terminal information including terminal identification information corresponding to the terminal device when the quasi-connected terminal information does not exist when the downlink transmission failure occurs. How the device works. 13. The method of claim 12,
The relay control step,
And if the quasi-connected terminal information is present, determining whether the received downlink data packet is a downlink data packet to a terminal device managed as the quasi-connected state terminal. The method according to claim 12 or 13,
The relay control step,
It is determined whether the received downlink data packet corresponds to the terminal identification information included in the quasi-connected terminal information. If the corresponding downlink data packet corresponds to the terminal identification information included in the quasi-connected terminal information, the downlink data packet is stored in the quasi-connected packet. Storing in the area,
And storing the downlink data packet in a specific packet transmission standby area so as to transmit the downlink data packet to a corresponding terminal device if the terminal connection information is not included in the quasi-connection terminal information. . The method of claim 11,
If there is a terminal device which is maintained as a quasi-connection state terminal for a preset quasi-connection state holding time, the quasi-connection state is maintained in the quasi-connection terminal information storing the terminal identification information of at least one terminal device managed by the quasi-connection state terminal. And deleting the terminal identification information of the terminal device maintained for more than a period of time and recognizing the terminal device as a disconnection terminal. The method of claim 15,
And deleting, from the quasi-connected packet storage area, a downlink data packet to the corresponding terminal device that is recognized as the disconnection terminal. The method of claim 11,
When the uplink data packet is received from the terminal device managed as the quasi-connection state terminal, the terminal corresponding to the uplink data packet in the quasi-connection terminal information storing the terminal identification information of at least one terminal device managed as the quasi-connection state terminal. And deleting the terminal identification information of the device and recognizing the corresponding terminal device as a connection terminal. The method of claim 17,
And moving the downlink data packet to the terminal device recognized as the connection terminal from the quasi-connection packet storage area to a specific packet transmission standby area and storing the data packet.

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