WO2008069438A1 - The method and apparatus for receiving communication data - Google Patents

The method and apparatus for receiving communication data Download PDF

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Publication number
WO2008069438A1
WO2008069438A1 PCT/KR2007/005193 KR2007005193W WO2008069438A1 WO 2008069438 A1 WO2008069438 A1 WO 2008069438A1 KR 2007005193 W KR2007005193 W KR 2007005193W WO 2008069438 A1 WO2008069438 A1 WO 2008069438A1
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WO
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Patent type
Prior art keywords
data signal
communication network
signal received
format
mobile communication
Prior art date
Application number
PCT/KR2007/005193
Other languages
French (fr)
Inventor
Nam Kyung Lee
Dae Ig Chang
Ho Jin Lee
Original Assignee
Electronics And Telecommunications Research Institute
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date

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Classifications

    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04WWIRELESS COMMUNICATIONS NETWORKS
    • H04W28/00Network traffic or resource management
    • H04W28/02Traffic management, e.g. flow control or congestion control
    • H04W28/08Load balancing or load distribution
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04BTRANSMISSION
    • H04B7/00Radio transmission systems, i.e. using radiation field
    • H04B7/14Relay systems
    • H04B7/15Active relay systems
    • H04B7/185Space-based or airborne stations; Stations for satellite systems
    • H04B7/1853Satellite systems for providing telephony service to a mobile station, i.e. mobile satellite service
    • H04B7/18532Arrangements for managing transmission, i.e. for transporting data or a signalling message
    • H04B7/18536Shadowing compensation therefor, e.g. by using an additional terrestrial relay
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04WWIRELESS COMMUNICATIONS NETWORKS
    • H04W84/00Network topologies
    • H04W84/02Hierarchically pre-organised networks, e.g. paging networks, cellular networks, WLAN [Wireless Local Area Network] or WLL [Wireless Local Loop]
    • H04W84/04Large scale networks; Deep hierarchical networks
    • H04W84/042Public Land Mobile systems, e.g. cellular systems
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04WWIRELESS COMMUNICATIONS NETWORKS
    • H04W84/00Network topologies
    • H04W84/02Hierarchically pre-organised networks, e.g. paging networks, cellular networks, WLAN [Wireless Local Area Network] or WLL [Wireless Local Loop]
    • H04W84/04Large scale networks; Deep hierarchical networks
    • H04W84/06Airborne or Satellite Networks
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04WWIRELESS COMMUNICATIONS NETWORKS
    • H04W88/00Devices specially adapted for wireless communication networks, e.g. terminals, base stations or access point devices
    • H04W88/16Gateway arrangements

Abstract

Provided are a method and apparatus for receiving communication data and more particularly, to a method and apparatus for receiving communication data by using a satellite communication network and a mobile communication network. The method includes (a) receiving a data signal over a satellite communication network; (b) receiving the data signal over a mobile communication network if a level of the data signal received over the satellite communication network is lower than a predetermined reference level; and (c) converting the data signal received over the mobile communication network into a signal of a format that can be received by an access point (AP) and outputting the converted signal. Seamless communication is possible without disposing an additional satellite communication repeater by receiving a data signal over the mobile communication network in an NLOS area where satellite communication is impossible.

Description

Description

THE METHOD AND APPARATUS FOR RECEIVING COMMUNICATION DATA

Technical Field

[1] The present invention relates to a method and apparatus for receiving communication data, and more particularly, to a method and apparatus for receiving communication data by using a satellite communication network and a mobile communication network.

[2] The present invention has been produced from the work supported by the IT R&D program of MIC (Ministry of Information and Communication) /ITTA (Institute for Information Technology Advancement) [2006-S-020-01, Development of Satellite and Terrestrial Convergence Technology for Internet Service on High-speed Mobile Vehicles] in Korea. Background Art

[3] FIG. 1 is a conceptual diagram illustrating a conventional method for transmitting data in bidirectional satellite communication. Referring to FIG. 1, a signal from a satellite 110 is received via an active antenna 101 attached to a mobile object. The received signal is converted into a signal of a format usable by data devices of the mobile object by a signal converter 103 after passing through a group terminal 102. For instance, assuming that the mobile object is a train as shown in FIG. 1, a wireless local area network (WLAN) signal is most appropriate for data communication by a mobile device such as a mobile phone or a notebook computer in the train. In this case, the signal converter 103 converts the received satellite communication data into a WLAN signal and transmits the WLAN signal to an access point (AP) 109.

[4] Meanwhile, a wireless repeater 105 receives a WLAN signal from the exterior of the mobile object and transmits the WLAN signal to the AP 109 via a wireless connector 107, as described in detail with reference to FIG. 2.

[5] FIG. 2 is a schematic diagram illustrating a case where direct communication with a satellite is impossible upon data transmission in conventional bidirectional satellite communication. As shown in FIG. 2, when the mobile object is passing through a none line of sight (NLOS) area such as a tunnel, the mobile object may not be in direct communication with the satellite 110 due to any obstacle present between the mobile object and the satellite 110. In this case, a repeater 201 located in a area communicable with the satellite 110 receives a satellite communication data signal from the satellite 110 and outputs the received data signal toward the NLOS area via a wireless repeater 203. This output signal is received by the wireless repeater 105 attached to the outside of the mobile object that is passing through the NLOS area. The received signal is transmitted to the AP 109 via the wireless connector 107.

[6] Since the repeater 201 located in the LOS area converts the satellite communication data signal into the WLAN signal and transfers the WLAN signal to the plural wireless repeaters 203 located in the NLOS area and the wireless repeater 105 attached to the outside of the mobile object directly receives the data signal from the wireless repeater 203, the signal can be transmitted to the AP 109 via the connector 107 directly without passing through the signal converter 103, unlike the case where the signal is received via the active antenna 101 of FIG. 1.

[7] However, this data signal transmission requires the wireless repeaters 203 disposed in the NLOS area, costing much to install the repeaters 203 at the first time if there are many NLOS areas such as downtowns or mountains.

[8] Meanwhile, mobile communication networks have been built in most areas, and especially, mobile communication repeaters have been already installed in most NLOS areas for satellite communication, such as downtown, subway, trunk road and railroad areas.

[9] Thus, there is a need for a method capable of receiving high quality communication data with a minimized cost of installing the repeaters by combing a mobile communication network with a satellite communication network. Disclosure of Invention

Technical Problem

[10] The present invention is directed to a method and apparatus for receiving communication data by using a mobile communication network and a satellite communication network.

[11] The present invention is also directed to a method and apparatus for seamless communication in none line of sight (NLOS) areas. Technical Solution

[12] One aspect of the present invention provides a method for receiving communication data, including the steps of: (a) receiving a data signal over a satellite communication network; (b) receiving the data signal over a mobile communication network if a level of the data signal received over the satellite communication network is lower than a predetermined reference level; and (c) converting the data signal received over the mobile communication network into a signal of a format that can be received by an access point (AP) and outputting the converted signal.

[13] Another aspect of the present invention provides an apparatus for receiving communication data, including: a satellite communication gateway for converting a format of a data signal received over a satellite communication network; a mobile com- munication gateway for converting a format of a data signal received over a mobile communication network; a connection controller for outputting the data signal received from the mobile communication gateway if a level of the data signal received from the satellite communication gateway is lower than a predetermined reference value; and a wireless connection gateway for converting the data signal received from the connection controller into a signal of a format that can be received by an access point (AP).

Advantageous Effects

[14] The present invention provides seamless communication without disposing an additional satellite communication repeater by receiving a data signal over the mobile communication network in an NLOS area where satellite communication is impossible.

Brief Description of the Drawings [15] FIG. 1 is a conceptual diagram illustrating a conventional method for transmitting data in bidirectional satellite communication; [16] FIG. 2 is a schematic diagram illustrating a case where direct communication with a satellite is impossible upon data transmission in conventional bidirectional satellite communication; [17] FIG. 3 is a conceptual diagram illustrating a method for receiving communication data according to an exemplary embodiment of the present invention; [18] FIG. 4 is a block diagram illustrating a wireless-network interworking apparatus according to an exemplary embodiment of the present invention; and [19] FIG. 5 is a flowchart illustrating a method for receiving communication data according to an exemplary embodiment of the present invention.

Mode for the Invention [20] Hereinafter, exemplary embodiments of the present invention will be described in detail. However, the present invention is not limited to the exemplary embodiments disclosed below, but can be implemented in various types. Therefore, the present exemplary embodiments are provided for complete disclosure of the present invention and to fully inform the scope of the present invention to those ordinarily skilled in the art. [21] FIG. 3 is a conceptual diagram illustrating a method for receiving communication data according to an exemplary embodiment of the present invention. A method of receiving communication data according to an exemplary embodiment of the present invention will now be described with reference to FIG. 3. [22] A data signal from a data signal source such as a server may be transmitted to the inside of a mobile object over a satellite communication network 300 and a mobile communication network 310.

[23] The data signal received over the satellite communication network 300 is transmitted to a wireless-network interworking apparatus 336 according to an exemplary embodiment of the present invention via an active antenna 330 and a group terminal 332. Then, the wireless-network interworking apparatus 336 converts the data signal received over the satellite communication network 300 into a signal of a format that can be received by an AP 342 and outputs the converted signal to the AP 342.

[24] If the mobile object enters an NLOS area such as a tunnel as shown in FIG. 3, the data signal received over the satellite communication network 300 is blocked or a level of the data signal is weakened. In such a NLOS area, the data signal is transmitted to the wireless-network interworking apparatus 336 via a repeater 320 of the mobile communication network 300, a mobile repeater 321 located in the NLOS area, and a mobile receiver 334 attached to the mobile object.

[25] When the data signal received over the satellite communication network 300 is lower than a predetermined reference value or a level of a data signal received over the mobile communication network 310, the wireless-network interworking apparatus 336 converts the data signal received over the mobile communication network 310 into a signal of a format that can be received by the AP 342 and outputs the converted signal to the AP 342.

[26] The apparatus, i.e., the wireless-network interworking apparatus and method for receiving communication data according to an exemplary embodiment of the present invention will now be described in greater detail with reference to FIGS. 4 and 5, respectively.

[27] FIG. 4 is a block diagram illustrating the wireless-network interworking apparatus according to an exemplary embodiment of the present invention.

[28] Referring to FIG. 4, the wireless-network interworking apparatus 400 according to the embodiment of the present invention comprises a satellite communication gateway 402, a mobile communication gateway 404, a connection controller 406, a wireless connection gateway 408, and a wireless connector 409.

[29] The wireless-network interworking apparatus 400 supports Internet protocol version

4 (IPv4) and Internet protocol version 6 (IPv6) and performs a subnet management function. Here, the subnet refers to a sub-network for performing a complete operation of inter-network connection by building a logical network. Data is not transmitted to the exterior of the subnet within a range divided by the router. The subnet is helpful for making the intensity of a routing table small. The wireless-network interworking apparatus 400 supports a debugging mode for monitoring an operational state of the network.

[30] A detailed structure and operation of the wireless-network interworking apparatus according to the exemplary embodiment of the present invention will now be described.

[31] The satellite communication gateway 402 according to the embodiment of the present invention converts a data signal of a satellite digital communication format received from the satellite communication receiver 410 into a signal of a format that can be processed by the wireless-network interworking apparatus 400. The satellite digital communication format includes a satellite digital multimedia broadcasting (DMB) format.

[32] The mobile communication gateway 404 according to this embodiment of the present invention converts a data signal of a WLAN or wireless broadcasting Internet (Wibro) format received from the mobile communication receiver 412 into a signal of a format that can be processed by the wireless-network interworking apparatus 400.

[33] The connection controller 406 according to this embodiment of the present invention analyzes the data signal received from the satellite communication gateway 402. When a level of the signal received from the satellite communication gateway 402 is lower than a predetermined reference value, the connection controller 406 determines that the mobile object had entered an NLOC area of the satellite communication network 300 and controls to receive the data signal via the mobile communication gateway 404.

[34] The connection controller 406 compares a level of the data signal received over the satellite communication network 300 with a level of the data signal received over the mobile communication network 310, and outputs the data signal having a higher level to the wireless connection gateway 408.

[35] The connection controller 406 also performs a hand-over function so that seamless communication is made when a mobile terminal communicating with the AP 342 enters a coverage area of another AP 342.

[36] The connection controller 406 also sets a quality of service (QoS) depending on terminals connected to the system, and determines a data transfer rate and a communication quality for each terminal depending on the set QoS.

[37] The connection controller 406 also requests the group terminal to perform frequency management according to the number of mobile terminals connected to the system for frequency resource management.

[38] The wireless connection gateway 408 converts the signal received from the connection controller 406 into a signal of a format suitable to be output to the AP 342 in the mobile object.

[39] The wireless connector 409 outputs the converted signal from the wireless connection gateway 408 to the AP 342 of the mobile object.

[40] The wireless connector 409 performs a routing function for data transmission and supports static routing protocols, such as Internet protocol (IP), address resolution protocol (ARP), reverse address resolution protocol (RARP), Internet control message protocol (ICMP), and Internet group management protocol (IGMP), and dynamic routing protocols, such as routing information protocol (RIP) and open-shortest path- first (OSPF). The static routing protocol provides a higher routing speed and excellent security since the protocol allows a user to input a path directly. The dynamic routing protocol can automatically cope with several situations by a router communicating with other routers by oneself.

[41] In order to provide service to a mobile station connected to the system, the wireless connector 409 provides a security function for information transmitted and received among an authentification center, the mobile station, and a central station, by using an identifier of the mobile station.

[42] The satellite communication receiver 410 includes a receiver for receiving the data signal via an active phase antenna capable of receiving the data signal via the satellite communication network 300 and via a gap filler.

[43] The mobile communication receiver 412 includes an IEEE 802.16e receiver capable of receiving a Wibro portable Internet signal.

[44] FIG. 5 is a flowchart illustrating a method for receiving communication data according to an exemplary embodiment of the present invention. The method for receiving satellite communication data according to an exemplary embodiment of the present invention will now be described in detail with reference to FIG. 5.

[45] In step 500, the connection controller 406 receives a data signal via the satellite communication network 300.

[46] In step 502, the connection controller 406 compares a level of the data signal received over the satellite communication network 300 in step 500 with a predetermined reference value. If the level of the received data signal is lower than the reference value, the procedure proceeds to step 504. If not, the procedure proceeds to step 510.

[47] In step 504, the connection controller 406 receives the data signal through the mobile communication network 406.

[48] In step 506, the connection controller 406 compares the level of the data signal received over the satellite communication network 300 with a level of the data signal received over the mobile communication network 310. If the level of the data signal received over the satellite communication network 300 is lower than the level of the data signal received over the mobile communication network 310, the procedure proceeds to step 508. If not, the procedure proceeds to step 510.

[49] In step 508, the wireless connection gateway 408 converts the data signal received over the mobile communication network 310 into a signal of a format that can be received by the AP 342 and outputs the converted signal to the wireless connector 409. The wireless connector 409 outputs the converted signal to the AP 342 and then the procedure ends.

[50] Meanwhile, step 510 is performed when it is determined in step 502 that the level of the data signal received over the satellite communication network 300 is higher than the reference value or when it is determined in step 506 that the level of the data signal of the satellite communication network 300 is higher than the level of the data signal received over the mobile communication network 310. In step 510, the wireless connector 409 converts the data signal received over the mobile communication network 310 into a signal of a format that can be received by the AP 342 and outputs the converted signal to the wireless connector 409. The wireless connector 409 outputs the converted signal to the AP 342 and then the procedure ends.

[51] While the invention has been shown and described with reference to m certain exemplary embodiments thereof, 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.

Claims

Claims
[1] A method for receiving communication data, comprising the steps of:
(a) receiving a data signal over a satellite communication network;
(b) receiving the data signal over a mobile communication network if a level of the data signal received over the satellite communication network is lower than a predetermined reference level; and
(c) converting the data signal received over the mobile communication network into a signal of a format that can be received by an access point (AP) and outputting the converted signal.
[2] The method according to claim 1, wherein step (c) comprises converting the data signal received over the satellite communication network into the signal of the format that can be received by the AP and outputting the converted signal if the level of the data signal received over the satellite communication network is higher than the level of the data signal received over the mobile communication network.
[3] The method according to claim 1, wherein step (c) comprises converting the data signal received over the mobile communication network into the signal of the format that can be received by the AP and outputting the converted signal if the level of the data signal received over the satellite communication network is lower than the level of the data signal received over the mobile communication network.
[4] The method according to claim 1, wherein the data signal received over the satellite communication network comprises a signal of a satellite digital multimedia broadcasting format.
[5] The method according to claim 1, wherein the data signal received over the mobile communication network is a signal of a wireless local area network (WLAN) or wireless broadcasting Internet (Wibro) format.
[6] The method according to claim 1, wherein a format of the output signal includes at least one of Internet protocol (IP), routing information protocol (RIP), open- shortest path-first (OSPF), address resolution protocol (ARP), reverse address resolution protocol (RARP), Internet control message protocol (ICMP), and Internet group management protocol (IGMP).
[7] An apparatus for receiving communication data, comprising: a satellite communication gateway for converting a format of a data signal received over a satellite communication network; a mobile communication gateway for converting a format of a data signal received over a mobile communication network; a connection controller for outputting the data signal received from the mobile communication gateway if a level of the data signal received from the satellite communication gateway is lower than a predetermined reference value; and a wireless connection gateway for converting the data signal received from the connection controller into a signal of a format that can be received by an access point (AP).
[8] The apparatus according to claim 7, wherein the connection controller converts the data signal received from the satellite communication gateway into the signal of the format that can be received by the AP if the level of the data signal received from the satellite communication gateway is higher than the level of the data signal received from the mobile communication gateway.
[9] The apparatus according to claim 7, wherein the connection controller converts the data signal received from the mobile communication gateway into the signal of the format that can be received by the AP if the level of the data signal received from the satellite communication gateway is lower than the level of the data signal received from the mobile communication gateway.
[10] The apparatus according to claim 7, wherein the connection controller performs a hand-over function when a terminal communicating via the AP enters a coverage area of another access point.
[11] The apparatus according to claim 7, wherein the connection controller requests a group terminal to perform frequency resource management depending on the number of mobile terminals communicating via the AP.
[12] The apparatus according to claim 7, wherein the connection controller determines a priority of service according to a mobile terminal communicating via the AP and controls a data transfer rate according to the priority of service.
[13] The apparatus according to claim 7, wherein the data signal received over the satellite communication network comprises a signal of a satellite digital multimedia broadcasting (DMB) format.
[14] The apparatus according to claim 7, wherein the data signal received over the mobile communication network is a signal of a wireless local area network (WLAN) or wireless broadcasting Internet (Wibro) format.
[15] The apparatus according to claim 7, wherein a format of the signal output from the wireless connection gateway includes any one of Internet protocol (IP), routing information protocol (RIP), open-shortest path-first (OSPF), address resolution protocol (ARP), reverse address resolution protocol (RARP), Internet control message protocol (ICMP), and Internet group management protocol (IGMP).
PCT/KR2007/005193 2006-12-06 2007-10-23 The method and apparatus for receiving communication data WO2008069438A1 (en)

Priority Applications (4)

Application Number Priority Date Filing Date Title
KR20060122902 2006-12-06
KR10-2006-0122902 2006-12-06
KR10-2007-0061670 2007-06-22
KR20070061670A KR20080052253A (en) 2006-12-06 2007-06-22 The method and apparatus for receiving communication data

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2010070435A1 (en) * 2008-12-19 2010-06-24 Telespazio S.P.A. System for satellite communications in tunnels

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US5914942A (en) * 1996-10-25 1999-06-22 Ericsson Inc. Satellite communications system with dual mode bandwidth control
US6272315B1 (en) * 1997-12-03 2001-08-07 Northern Telecom Limited Mobile satellite system/terrestrial wireless system interworking techniques
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WO2004012471A1 (en) * 2002-07-29 2004-02-05 Interdigital Technology Corporation Method and apparatus for delivery of universal mobile telecommunications system (umts) based unit directional services over a wireless local area network (wlan)
US6879829B2 (en) * 2003-05-16 2005-04-12 Mobile Satellite Ventures, Lp Systems and methods for handover between space based and terrestrial radioterminal communications, and for monitoring terrestrially reused satellite frequencies at a radioterminal to reduce potential interference

Patent Citations (5)

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Publication number Priority date Publication date Assignee Title
US5914942A (en) * 1996-10-25 1999-06-22 Ericsson Inc. Satellite communications system with dual mode bandwidth control
US6272315B1 (en) * 1997-12-03 2001-08-07 Northern Telecom Limited Mobile satellite system/terrestrial wireless system interworking techniques
KR20030088730A (en) * 2002-05-14 2003-11-20 에스케이 텔레콤주식회사 Apparatus and Method for public WLAN service using radio bridge in subway area
WO2004012471A1 (en) * 2002-07-29 2004-02-05 Interdigital Technology Corporation Method and apparatus for delivery of universal mobile telecommunications system (umts) based unit directional services over a wireless local area network (wlan)
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Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2010070435A1 (en) * 2008-12-19 2010-06-24 Telespazio S.P.A. System for satellite communications in tunnels
US20120069777A1 (en) * 2008-12-19 2012-03-22 Telespazio S.P.A. System for Satellite Communications in Tunnels
US8837333B2 (en) 2008-12-19 2014-09-16 Telespazio S.P.A. System for satellite communications in tunnels
CN102362445B (en) 2008-12-19 2014-09-17 电视广播有限公司 System for satellite communications in tunnels

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