Patent Application
20160269102
This application claims the priority benefit of Korean Patent Application No. 10-2015-0032983, filed on Mar. 10, 2015, in the Korean Intellectual Property Office, the disclosure of which is incorporated herein by reference.
1. Field of the Invention
Embodiments relate to an apparatus for transmitting and receiving data through a satellite network, and more particularly, to an apparatus for transmitting and receiving data in multiple transmission paths including a satellite network and a wired network.
2. Description of the Related Art
Satellite communication refers to communication using a geostationary satellite positioned outside the atmosphere and revolving around the earth at a speed equal to a rotation speed of the earth. Satellite communication uses microwaves, and thus may perform high-speed and high-capacity communication and provide coverage to a wide area, for example, the entire area of a predetermined country. Further, satellite communication may provide stable communication irrespective of geographical features and be free from communication restraints even when disaster occurs. However, in satellite communication, a radio wave may require a round trip time of about 0.24 seconds. Thus, the radio wave may be delayed during audio communication, and security of data may not be guaranteed. In addition, since solar cells are used as a power source, data loss, for example, temporary communication loss, may occur when a satellite is in the shade of the earth or when it rains heavily.
According to an aspect, there is provided a data receiving apparatus including a first interface configured to receive content data transmitted through a satellite network path, a second interface configured to receive redundant data transmitted through a wired network path, the redundant data including information to be used to restore the content data, and a processor configured to restore a lost portion of the content data using the redundant data. The redundant data may be generated by applying random linear network coding to the content data.
The first interface may be configured to receive the content data in real time, and the second interface may be configured to receive the redundant data before the content data is received through the first interface. The first interface may be configured to receive the content data from a content data provider by performing satellite communication using a predetermined satellite bandwidth, and the second interface may be configured to receive redundant data with respect to the content data from the content data provider by performing terrestrial communication using a predetermined wired bandwidth.
According to another aspect, there is also provided a data receiving apparatus including a first interface configured to receive content data transmitted through a first communication network path, a second interface configured to receive redundant data including information to used to restore the content data through a second communication network path differing from the first communication network path, and a processor configured to restore a lost portion of the content data using the redundant data. The first communication network path and the second communication network path may be two different network paths selected from a satellite network path, a terrestrial wireless network path, and a wired network path. The redundant data may be generated by applying random linear network coding to the content data.
According to still another aspect, there is also provided a data receiving apparatus including a first interface configured to receive general data transmitted through a satellite network path, among original data including security data and the general data, a second interface configured to receive the security data through a wired network path, and a processor configured to regenerate the original data by combining the security data and the general data. The original data may be divided into the general data and the security data by a preset criterion. The second interface may be configured to receive security data to which a preset encryption method is applied, and the processor may be configured to restore the original data by applying a decryption method corresponding to the encryption method to the security data.
These and/or other aspects, features, and advantages of the invention will become apparent and more readily appreciated from the following description of embodiments, taken in conjunction with the accompanying drawings of which:
Hereinafter, reference will now be made in detail to embodiments with reference to the accompanying drawings, wherein like reference numerals refer to like elements throughout. However, the scope of the disclosure is not limited by those embodiments.
The terms used herein are mainly selected from general terms currently being used in related art(s). However, other terms may be used depending on development and/or changes in technology, custom, or a preference of an operator. Thus, it should be understood that the terms used herein are terms merely used to describe the embodiments, rather terms intended to limit the spirit and scope of this disclosure.
In addition, in a specific case, most appropriate terms have been arbitrarily selected by the inventors for ease of description and/or for ease of understanding. In this instance, the meanings of the arbitrarily used terms will be clearly explained in the corresponding description. Hence, the terms should be understood not by the simple names of the terms, but by the meanings of the terms and the following overall description of this specification.
Data may be transmitted and received using radio waves through a wireless communication network or wireless network which uses a base station installed on the ground, a wired communication network which uses a cable connecting a provider directly to a consumer, or a satellite communication network which uses a satellite outside the atmosphere. The wired communication network may be used to transmit and receive a large volume of data such as application data and non-real-time broadcast content, for example, content provided through an Internet protocol television (IPTV). The wireless communication network may be used to transmit and receive audio data, for example, of a phone call, image data, and text data in a mobile communication terminal such as a portable phone. The satellite communication network may perform high-speed and high-capacity communication and provide coverage to a wide area when compared to other communication networks. Thus, the satellite communication network is widely used in broadcast communication fields recently. For example, real-time broadcast content and related control signals for broadcast may be transmitted through the satellite network. To transmit and receive predetermined data, a communication device may be determined based on features of each communication network. In this example, a terminal capable of receiving data through the single determined communication network may be used.
Meanwhile, a single data receiver may receive data through various transmission paths. The data receiver may include equipment configured to receive data transmitted through at least one communication network. For example, a device supporting both wireless communication and wired communication may receive audio data transmitted through wireless communication, and also receive IPTV content transmitted through wired communication.
The first interface 110 may receive content data transmitted through the satellite communication network 160. In this example, the first interface 110 may receive the content data in real time. Receiving the content data in real time refers to receiving the content data immediately when the content data is transmitted by the content provider 150, and may include, for example, receiving broadcast content in a broadcast time.
The second interface 120 may receive data transmitted through the wired communication network 170. The data received through the second interface 120 may be associated with the content data received through the first interface 110. In detail, the data received through the second interface 120 may be redundant data including information to be used to restore the content data. As will be described below, when a portion of the content data received through the first interface 110 is lost, the processor 130 may restore the lost data using the redundant data received through the second interface 120. The second interface 120 may receive the redundant data before the content data is received through the first interface 110. When the content data is received in real time through the first interface 110, the second interface 120 may receive the redundant data with respect to the corresponding content data in advance. For example, when broadcast content is to be received as content data through the first interface 110 based on a broadcast schedule, redundant data with respect to the corresponding broadcast content may be received through the second interface 120 before a broadcast time.
Referring to
The redundant data may be received through the wired network, and network coding may be applied to the redundant data.
The redundant data may be generated by applying random linear network coding to the content data. Random linear network coding is a method that restores an original signal, for example, data to which network coding is yet to be applied, using coded packets, for example, data, received from a destination node with a probability of nearly “1”. Thus, the content data which is the original data may be restored through the redundant data.
The redundant data including the information to be used to restore the content data may be generated by applying random linear network coding to the content data. Random linear network coding is a method of transmitting data coded using an intermediate node, such as a relay, of a network. Random linear network coding may restore an original signal using data received by a reception node which is a destination. In this example, a probability of restoring the original signal is nearly “1”, and thus a transmission efficiency may increase.
The processor 630 may restore a lost portion of the content data using the redundant data. For example, in a case of the same items of content data are received, or the redundant data generated by applying network coding is received, the original content data may be restored in response to loss of the content data.
In another example, the data receiving apparatus 600 may receive original data being divided through heterogeneous network paths. In detail, general data of the original data may be received using a satellite communication network which enables high-speed and high-capacity transmission, and security data of the original data may be received through a wired communication network which guarantees security since the security data requires security. Accordingly, the data receiving apparatus 600 may include a first interface 610 configured to receive general data transmitted through a satellite network path, among original data including security data and the general data, a second interface 620 configured to receive the security data of the original data through a wired network path, and a processor 630 configured to regenerate the original data by combining the security data and the general data. In this example, the original data may be divided into the general data and the security data by preset criteria. The preset criteria may include personal data of users, medical records of patients, credit information of users, grade information of students, and family information of users. The present criteria may also include ID and password information of users.
The first interface 610 is configured to receive general data, and thus may receive data through a satellite communication network which does not guarantee security. The second interface 620 is configured to receive security data, and thus may receive data through a wired communication network which guarantees security. Meanwhile, the second interface 620 may also receive data through another communication network which provides security, and the first interface 610 configured to receive general data may also receive data through a communication network which guarantees security.
Further, to enhance security, the second interface 620 may receive security data to which a preset encryption method is applied. The second interface 620 may receive security data encrypted using various encryption methods. The encryption methods may include, for example, symmetric-key encryption, public-key encryption, Rivest-Shamir-Adleman (RSA) encryption, and quantum encryption. In this example, the processor 630 may restore the original data by applying a decryption method corresponding to the applied encryption method to the security data.
In another example, a data transmitting apparatus may be provided to transmit and receive data through multiple transmission paths.
The first interface 720 may transmit content data stored in the DB 710 to a geostationary satellite 750 through a satellite network path. A terminal capable of receiving data transmitted through the geostationary satellite 750 over a satellite network may receive the content data.
The second interface 730 may transmit redundant data generated by applying network coding to the content data stored in the DB 710 to a router 760 through a wired network path. The router 760 may transmit the content data to a terminal capable of receiving data transmitted over a wired network.
In this example, the content data may be restored using the redundant data. In detail, the extra redundant data may be transmitted in case of loss of the content data. The redundant data may include information to be used to restore the content data. For example, the redundant data may be the content data itself, or data generated by applying network coding to the content data. In particular, the redundant data may be generated by applying random linear network coding to the content data. Random linear network coding is a communication method that provides high transmission efficiency and restores an original signal using data received from a destination node with a probability of nearly “1”. Thus, the redundant data may be transmitted by applying random linear network coding to the content data.
According to the embodiments provided above, a packet loss rate with respect to a satellite communication network having a high packet loss rate may remarkably decrease. Further, since redundant data generated against data loss may not be transmitted through the satellite communication network, a number of packets to be transmitted through the satellite communication network may not change, and a bandwidth of the satellite communication network may be maintained constant without being reduced. A wired communication network may be additionally used, and thus high-quality image data may be transmitted without loss through the satellite communication path. For example, by applying the foregoing method a satellite broadcast service transmitting high-quality image content in a Ka band highly susceptible to rain attenuation, broadcast content may be transmitted and received effectively.
The units described herein may be implemented using hardware components and software components. For example, the hardware components may include microphones, amplifiers, band-pass filters, audio to digital convertors, and processing devices. A processing device may be implemented using one or more general-purpose or special purpose computers, such as, for example, a processor, a controller and an arithmetic logic unit, a digital signal processor, a microcomputer, a field programmable array, a programmable logic unit, a microprocessor or any other device capable of responding to and executing instructions in a defined manner. The processing device may run an operating system (OS) and one or more software applications that run on the OS. The processing device also may access, store, manipulate, process, and create data in response to execution of the software. For purpose of simplicity, the description of a processing device is used as singular; however, one skilled in the art will appreciate that a processing device may include multiple processing elements and multiple types of processing elements. For example, a processing device may include multiple processors or a processor and a controller. In addition, different processing configurations are possible, such as parallel processors.
The software may include a computer program, a piece of code, an instruction, or some combination thereof, to independently or collectively instruct or configure the processing device to operate as desired. Software and data may be embodied permanently or temporarily in any type of machine, component, physical or virtual equipment, computer storage medium or device, or in a propagated signal wave capable of providing instructions or data to or being interpreted by the processing device. The software also may be distributed over network coupled computer systems so that the software is stored and executed in a distributed fashion. The software and data may be stored by one or more non-transitory computer readable recording mediums The non-transitory computer readable recording medium may include any data storage device that can store data which can be thereafter read by a computer system or processing device. Examples of the non-transitory computer readable recording medium include read-only memory (ROM), random-access memory (RAM), CD-ROMs, magnetic tapes, floppy disks, optical data storage devices. Also, functional programs, codes, and code segments that accomplish the examples disclosed herein can be easily construed by programmers skilled in the art to which the examples pertain based on and using the flow diagrams and block diagrams of the figures and their corresponding descriptions as provided herein.
As a non-exhaustive illustration only, a terminal or device described herein may refer to mobile devices such as a cellular phone, a personal digital assistant (PDA), a digital camera, a portable game console, and an MP3 player, a portable/personal multimedia player (PMP), a handheld e-book, a portable laptop PC, a global positioning system (GPS) navigation, a tablet, a sensor, and devices such as a desktop PC, a high definition television (HDTV), an optical disc player, a setup box, a home appliance, and the like that are capable of wireless communication or network communication consistent with that which is disclosed herein.
A number of examples have been described above. Nevertheless, it should be understood that various modifications may be made. For example, suitable results may be achieved if the described techniques are performed in a different order and/or if components in a described system, architecture, device, or circuit are combined in a different manner and/or replaced or supplemented by other components or their equivalents. Accordingly, other implementations are within the scope of the following claims.
| Number | Date | Country | Kind |
|---|---|---|---|
| 10-2015-0032983 | Mar 2015 | KR | national |
