KR101042112B1 - Method for processing portable internet using satellite and system thereof - Google Patents

Abstract

According to the present invention, the uplink cell in which uplink traffic is transmitted and the downlink cell in which downlink traffic is transmitted are separately configured to provide a portable Internet, and the radius of the downlink cell is increased to reduce the number of handoffs for downlink traffic, The present invention relates to a technique for reducing round trip time generated in downlink traffic transmitted through a PC.

To this end, the present invention provides a first process for transferring the information of the mobile terminal to the IP network when the mobile terminal requests the use of the mobile Internet to the mobile communication network; A second step of authenticating the portable terminal and assigning a home address (HoA) to the mobile terminal which has been successfully authenticated; A third step of the mobile communication network connecting the portable terminal to a destination CN of an IP network using the HoA; A fourth step of transmitting the data packet transmitted from the destination to the HA corresponding to the HoA; A fifth step in which the HA transmits a Spoofing ACK to the destination and continuously receives a data packet from the destination; And a sixth process of transmitting the data packet received by the HA to the portable terminal via the satellite and the downlink base station.

Description

Method and system for providing mobile internet using satellites {Method for processing portable internet using satellite and system}

1 is a cell configuration diagram when a mobile Internet providing method using a satellite according to an embodiment of the present invention is applied.

2 is a network configuration to which a mobile Internet providing method using satellites according to an embodiment of the present invention is applied.

3 to 4 is a timing diagram showing a signal processing procedure in a portable Internet system using a satellite according to an embodiment of the present invention.

5 is a flowchart for explaining a mobile Internet providing method using a satellite according to another embodiment of the present invention.

The present invention relates to a mobile Internet providing method and system using satellites, and more particularly, in providing a mobile Internet, an uplink cell for transmitting uplink traffic and a downlink cell for transmitting downlink traffic are separately configured and The present invention relates to a technique for reducing the number of handoffs for downlink traffic by increasing the radius and reducing round trip time generated in downlink traffic transmitted through satellites.

With the development of internet technology, in addition to the wired internet accessing the internet via a wired LAN card, a wireless internet technology capable of accessing the internet via a wireless LAN card has also been realized.

Wireless Internet technologies include a WiFi method defined in IEEE 802.11 that does not support mobility, and a WiBro method that supports mobility.

In the case of the WiFi system, a wireless LAN card can be used to access the wireless Internet within a cell radius of several hundred meters formed as an access point. Conventionally, since WiFi does not support handoff, there is a disadvantage in that mobility is not supported for a wireless terminal.

Unlike Wi-Fi, WiBro, which supports mobility, supports handoff, so that even when a wireless terminal moves a cell, the handoff is performed so that the wireless terminal can continuously use the wireless Internet. Hereinafter, in the present invention, the Internet that guarantees mobility in the wireless Internet is referred to as a mobile internet.

Such a WiBro has a diameter of a cell formed by a wireless base station of about several hundred m to about 1 Km, and considering the delay caused by handoff, a WiBro has a constant speed, for example, 60 Km. Can support Therefore, WiBro exhibits excellent performance in urban areas or sub-center areas where traffic is crowded and users are relatively less mobile.

However, as the mobility of the mobile terminal increases, WiBro is frequently secreted by urban areas, public roads, and highways where handoffs occur frequently due to the small downward cell radius, and the mobility of the mobile terminal is increased (ie, the moving speed is increased). In the open area, the handoff period is shortened due to the small size of the cell, resulting in discontinuity of the downlink traffic, and the disconnection of the downlink traffic occurs. Since this causes a decrease in the quality of service, it is not suitable to apply WiBro to densely populated areas.

In order to provide a portable Internet smoothly in such a densely populated area, a method of minimizing handoff of downlink traffic should be considered. To this end, a method of amplifying the output of a base station for transmitting and receiving a signal for portable Internet and enlarging the size of a cell formed by the base station may be considered.

However, in this case, since the output of the portable terminal communicating with the base station must also be counted, there are various problems that the battery consumption increases and the amount of electromagnetic waves emitted during use increases.

Accordingly, the present invention has been made to solve the above-mentioned conventional problems. When providing a mobile Internet service in an open population density area, the upstream traffic is via a mobile communication network, and the downlink traffic is a satellite and a cell radius. It aims to provide high quality portable Internet service even in low-density populated areas by minimizing handoff for downlink traffic by transmitting to the portable terminal through this large base station for portable Internet.                         

In addition, another object of the present invention is to minimize round trip time that may occur when downlink traffic is transmitted through a base station for portable Internet via satellite.

In order to achieve the above object, the mobile Internet providing method using the satellite according to the present invention, when the mobile terminal requests the use of the mobile Internet to the mobile communication network, the first process of transferring the information of the mobile terminal to the IP network ; A second step of authenticating the portable terminal and assigning a home address (HoA) to the mobile terminal which has been successfully authenticated; A third step of the mobile communication network connecting the portable terminal to a destination CN of an IP network using the HoA; A fourth step of transmitting the data packet transmitted from the destination to the HA corresponding to the HoA; A fifth step in which the HA transmits a Spoofing ACK to the destination and continuously receives a data packet from the destination; And a sixth process of transmitting the data packet received by the HA to the portable terminal via the satellite and the downlink base station.

In addition, the portable Internet providing system using the satellite according to the present invention, a mobile terminal for supporting the mobile communication network band and the portable Internet band; Mobile communication means for receiving uplink traffic from the portable terminal and transmitting the portable Internet-related traffic to an IP network; Portable Internet communication means for performing authentication on the portable terminal, managing the location of the portable terminal, and communicating with a destination of an IP network by applying a spoofing technique; An satellite receiving downlink traffic to be transmitted from the portable internet communication means to the portable terminal and transmitting the downlink traffic to a downlink base station through satellite communication; And a downlink base station receiving the downlink traffic from the satellite and transmitting the downlink traffic to the portable terminal through the portable internet band.

Hereinafter, with reference to the accompanying drawings will be described an embodiment of the present invention in more detail.

1 is a cell configuration diagram when the mobile Internet providing method using the satellite according to an embodiment of the present invention is applied.

As shown in FIG. 1, a downlink cell (DC) generated by a downlink base station 10 transmitting a radio signal in a frequency band corresponding to the portable Internet, for example, 2.3 GHz, and a mobile communication network correspond to mobile communication. The uplink cells DC1 to DC9 generated by the mobile communication base station 20 for transmitting / receiving radio signals in a frequency band of, for example, 0.8 GHz or 1.8 GHz are configured.

The mobile terminal 30 can process both a mobile communication frequency band (0.8 GHz or 1.8 GHz) and a mobile internet frequency band (2.3 GHz), and from the AAA server (not shown) of the mobile Internet through the mobile communication base station 20. After receiving the authentication, a Home Agent (HoA) is registered and assigned a Home Address (HoA), and a data packet transmitted from a destination CN (Correspondent Node) is received through the assigned HoA.

When the mobile base station 20 requests the portable Internet from the portable terminal 30, the mobile communication base station 20 authenticates the information of the portable terminal 30 to the AAA server of the portable internet, and upon request of the portable terminal 30 assigned the HoA, the CN Performs the function of accessing.

The downlink base station 10 transmits the downlink traffic transmitted by the CN to the HA through the HA to the portable terminal 30 through the HA.

Hereinafter, a mobile internet providing system using satellites according to an embodiment of the present invention will be described in detail with reference to FIG. 2.

As shown in FIG. 2, the portable Internet providing system using the satellite includes a mobile communication base station 20, a mobile communication network 25, an IP network 40, and an AAA that receive various signals transmitted from the mobile terminal 30. A server 42, HA 44, FA 72, satellite 70, and downlink base station 10 are provided.

In the present invention, the downlink base station 10 amplifies the output strength, thereby forming a wide radius of the downlink cell as shown in FIG.

First, when the mobile terminal 30 requests the CN 60 connection, the mobile communication network 25 managing the mobile communication base station 20 detects that the mobile Internet is requested from the mobile terminal 30, and then AAA server 42 Transmits an originating IP of the portable terminal 30 to request authentication for the portable terminal 30.

If authentication is successful by the AAA server 42, the AAA server 42 registers the mobile terminal 30 in the HA 44 closest to the source IP based on the source IP of the mobile terminal 30, If authentication fails, the mobile terminal 30 is notified of the authentication failure.

On the other hand, the HA 44 registered with the portable terminal 30 allocates a home agent (HoA) to the portable terminal 30 and transmits it to the FA 50. The HA 44 registers a binding list for the FA 50 in which the mobile terminal 30 is registered.

The FA 50 transmits HoA information to the mobile terminal 30 through the downlink base station 10, and then the mobile terminal 30 attempts to access the CN 60 using the HoA.

The CN 60 transmits a data packet to be transmitted to the portable terminal 30 to the HA 44 based on the HoA of the portable terminal 30 requesting the connection. HA 44 sends the data packet to FA 72, and FA 72 sends the data packet to satellite 70. At this time, the FA 72 includes the ID of the downlink base station to which the mobile terminal 30 is registered and identification information (for example, MAC address, etc.) of the mobile terminal 30 in the data packet to be transmitted to the satellite 70. And the satellite 70 downlinks the data packet to the downlink base station 10 so that the downlink base station 10 can transmit the data packet to the mobile terminal 10.

While using the mobile Internet through the above process, when the upcell is moved, a handoff occurs between the mobile communication base stations 20. However, even when the uplink handoff occurs, the HoA of the mobile terminal 30 does not change. The uplink traffic transmitted from the 30 is transmitted to the CN 60 configured in the IP network 40, and the CN 60 transmits a data packet to be transmitted to the portable terminal 30 to the HA 44, and the HA 44 ) Extracts the FA 50 registered by the mobile terminal 30 using the binding list, and transmits the data packet to the extracted FA 50.

Thereafter, the data packet is transmitted to the mobile terminal 10 through the satellite 70 and the downlink base station 10.

In this case, although handoff has occurred for upstream traffic, it can be seen that downlink traffic is processed without handoff. Referring to FIG. 1, while the mobile terminal 30 moves between the uplink cell DC2 and the uplink cell UC8, handoff occurs for uplink traffic, but no handoff occurs for downlink traffic. .

Meanwhile, in the embodiment of the present invention, since downlink traffic is transmitted using the satellite 70, there is a problem that a round trip time occurs due to a 250 ms propagation delay.

In the case of Transmission Control Protocol-Internet Protocol (TCP / IP), after transmitting a certain amount of data packets at the transmitting side, the data packets are continuously transmitted only when an ACK is received from the receiving side. If the ACK is not normally received from the receiver, the transmitter disconnects the session with the receiver and terminates the communication.

When the portable Internet providing method using the satellite according to the embodiment of the present invention is applied on the basis of TCP / IP, as shown in FIG. 3, the CN 60 corresponding to the transmitting side transmits data packet 1 and then the mobile communication network 25. Since the ACK must be received from the mobile terminal 30 through (), the data packet 2 in the next sequence is transmitted. Therefore, the data transmission time is significantly delayed due to the satellite propagation delay of 250 ms.

This delay in data transmission time adversely affects the quality of service.

Accordingly, in the present invention, in order to minimize the delay of the data transmission time, the HA 44 applies the spoofing technique.

A method of providing a mobile Internet using satellites according to an embodiment of the present invention will be described with reference to the timing diagram shown in FIG. 4 and the flowchart shown in FIG. 5.

When the data packet 1 from the CN 60 is transmitted via the IP network 40 (S2), the HA 44 determines whether there is a storage space in the buffer for storing the data packet (S40), If there is a storage space (Yes in S4), the data packet 1 is stored in the buffer (S8).

Subsequently, the HA 44 transmits the Spoofing ACK to the CN 60 through the IP network 40 (S10) and transmits the packet to the FA 72 in which the tunneling is formed.

Thereafter, the FA 72 transmits the identification information for the downlink base station 10, the identification information for the mobile terminal 30, and the data packet 1 to the satellite 70, and the satellite 10 transmits the received data. It transmits to the downlink base station 10.

Although the satellite propagation delay (250ms) occurs when transmitting data from the FA 72 to the downlink base station 10, the CN 60 receiving the Spoofing ACK receives the data through the IP network 40, as shown in FIG. Since packet 2 is transmitted, data packets can be received from CN 60 without being affected by satellite propagation delay (250ms).

On the other hand, the HA 44 determines whether an ACK is received from the mobile terminal 30 (S14), and when an ACK is received from the mobile terminal 30 (Yes in S14), the HA 44 stores the data packet in which the ACK is received in the buffer. Delete (S16) and proceed to the initial state.

However, as a result of the determination in S14, if no ACK is received from the portable terminal 30 (No in S14), it is checked whether a predetermined time has elapsed (S18).

As a result of the confirmation, when the elapse of the predetermined time is confirmed (Yes in S18), data packets not received with an ACK among the data packets stored in the buffer are retransmitted to the FA 44 in order.

Unlike the series of cases described above, if it is determined that the storage space does not exist in the buffer provided in the HA 44 (No in S4), communication with the portable terminal 30 is not normal. If not, the CN 60 is notified of the transmission failure (S6), and the session with the CN 60 is disconnected.

According to the present invention described with reference to FIG. 5, the data packet 2 is transmitted when the data packet 2 is transmitted from the CN 60 (b: see FIG. 4) when the HA 44 does not transmit the spoofing ACK. Since it becomes faster by "d" than the starting point (a: see FIGS. 3 and 4), the influence on the satellite propagation delay can be ignored.

In the above-described embodiment of the present invention, a means for spoofing processing is provided inside the HA 44 on the IP network 40 side, and the HA 44 has been described as applying the spoofing technique by itself. Means for the configuration may be configured separately from the HA 44, may be configured in the front of the HA 44 and the IP network 40.

According to the present invention as described above, by providing a mobile Internet using satellites, it is possible to reduce the hand-off for downlink traffic, and to transmit a data packet received from the CN to the mobile terminal without the influence of satellite propagation delays, population density It will also be possible to provide high quality mobile Internet services to the region.

On the other hand, the present invention is not limited to the above-described embodiment, but can be modified and modified within the scope not departing from the gist of the present invention, such modifications and changes should be regarded as belonging to the following claims. will be.

Claims (14)

A first step of transmitting the information of the portable terminal to the IP network when the portable terminal requests the use of the portable Internet through the mobile communication network; A second step of authenticating the portable terminal and assigning a home address (HoA) to the mobile terminal which has been successfully authenticated; A third step of the mobile communication network connecting the portable terminal to a destination CN of an IP network using the HoA; A fourth step of transmitting the data packet transmitted from the destination to the HA corresponding to the HoA; A fifth step in which the HA transmits a Spoofing ACK to the destination and continuously receives a data packet from the destination; And And a sixth process in which the data packet received by the HA is transmitted to the portable terminal via a satellite and a downlink base station. The method of claim 1, wherein the second process The mobile terminal may include registering a mobile terminal that has been successfully authenticated with a specific HA, receiving an HoA from the HA, and registering the mobile terminal with a specific FA and a specific downlink base station. How to provide. The method of claim 1, wherein the downlink base station is A portable internet providing method using a satellite, characterized in that the output strength is adjusted so that the radius of the down-cell is more than a predetermined value. The method of claim 1, A seventh step of the portable terminal requesting handoff to an IP network through the mobile communication network when an advertisement signal from the NEW downlink base station is received; An eighth step of the HA of the IP network performing handoff processing for the portable terminal based on the information of the portable terminal, and transferring the result to the FA and the downlink base station to which the portable terminal is to be registered; And And a ninth step of receiving, by the portable terminal, the handoff processing result from the downlink base station. The method of claim 1, wherein The HA transmits the data packet to the FA, and the FA uplinks the identifier of the downlink base station and the identifier of the portable terminal to the satellite together with the data packet. The method of claim 1, wherein in the fifth process The HA may store the data packet received from the CN in a buffer and then sequentially transmit the data packet; If an ACK is transmitted from the portable terminal, deleting a data packet to which the ACK is transmitted from the buffer; And And a third step of sequentially retransmitting the data packets stored in the buffer when the ACK is not transmitted from the portable terminal for a predetermined time. The method of claim 6, wherein the first step And if there is no space to store the data packet in the buffer, notifying the destination of the transmission failure, and terminating the connection with the destination. 7. The portable terminal according to any one of claims 1, 2, 4, 5, and 6, wherein the portable terminal corresponds to a frequency band corresponding to the mobile communication network and a portable internet communication network by the downlink base station. Portable Internet providing method using a satellite, characterized in that capable of supporting the frequency band. A mobile terminal supporting a mobile communication network band and a portable internet band; Mobile communication means for receiving uplink traffic from the portable terminal and transmitting the portable Internet-related traffic to an IP network; Portable Internet communication means for performing authentication on the portable terminal, managing the location of the portable terminal, and communicating with a destination of an IP network by applying a spoofing technique; An satellite receiving downlink traffic to be transmitted from the portable internet communication means to the downlink base station through satellite communication; And And a downlink base station receiving the downlink traffic from the satellite and transmitting the downlink traffic to the portable terminal through the portable internet band. The method of claim 9, wherein the portable Internet communication means, Authentication means for performing authentication on the portable terminal; An HA for allocating a home address (HoA) to the mobile terminal that has been successfully authenticated by the authentication means, and managing the position of the mobile terminal to perform a handoff to the mobile terminal; And And a FA for transmitting the downlink traffic transmitted from the HA to the downlink base station so that the portable terminal can receive the downlink traffic. The method of claim 9 or 10, wherein the downlink base station Portable Internet providing system using a satellite, characterized in that the output strength is adjusted so that the radius of the down-cell is more than a predetermined value. The method of claim 10, wherein the HA is After storing the data packet received from the destination in the buffer, the data packet is sequentially transmitted to the satellite, and if the ACK is transmitted from the mobile terminal through the mobile communication means, the data is transmitted in the buffer And discarding the packet and sequentially retransmitting the data packet stored in the buffer when the ACK is not transmitted from the portable terminal for a predetermined time. The method of claim 12, wherein the HA is And if there is no space to store the data packet in the buffer, notifying the destination of the transmission failure, and terminating the connection with the destination. The mobile terminal of claim 9, wherein the portable terminal comprises: And a frequency band corresponding to the mobile communication network and a frequency band corresponding to the portable internet communication network by the downlink base station.

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