KR20090015238A - Method and apparatus for broadcasting service by using ultra uwb in a wireless communication system - Google Patents

Abstract

A broadcasting service method using a UWB in a wireless communication system and an apparatus thereof are provided to broadcast multimedia data to a plurality of UWB terminals in a zone centering on a contact point by using a fast transmission technique of a UWB(Ultra Wide Band). A server(300) and a terminal(306) perform initialization for wireless communication connection(308). The terminal performs scanning for finding the server through RCL of the terminal. If the server is scanned, the terminal checks signal strength after requesting connection to the server. The server and terminal perform secure connection in the connection operation. The connected server and terminal perform a service. The terminal finds the UWB service being broadcast in the connected server(324). The server transmits broadcast service information or a record to the terminal(326). The terminal user selects a broadcast desired from the received broadcast service information(328).

Description

TECHNICAL AND APPARATUS FOR BROADCASTING SERVICE BY USING ULTRA UWB IN A WIRELESS COMMUNICATION SYSTEM}

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a technique for performing a broadcast service in a wireless communication system. In particular, the present invention relates to a radio suitable for performing a broadcast service to a plurality of terminals in a UWB zone by using an ultra wide band (hereinafter referred to as UWB). The present invention relates to a broadcast service method and apparatus using an ultra wide band in a communication system.

Today, with the development of the digital industry, various digital devices are evolving. These various digital devices have a communication function such as the Internet to perform Internet communication through a predetermined communication company system. For example, the notebook computer may provide an Internet service at a place where a predetermined network system is established even while moving over a wireless LAN.

In recent years, as the demand for ubiquitous networking increases, a short-range wireless personal area network (WPAN) technology that connects home appliances, office devices, and various information devices at home without installing wiring is attracting attention. have.

WPAN technology delivers information between relatively few users over a relatively short distance and allows direct communication between peripherals without cables. In particular, the high-speed WPAN operates at 2.4 GHz and supports up to hundreds of Mbps, enabling multimedia traffic transmission.

As WPAN will become a major technology for ubiquitous networking, standardization and technology development will be actively conducted worldwide and the market size will increase significantly.

Transmission methods used by the WPAN technology so far include WLAN, Bluetooth, Zigbee, and UWB. The WLAN is an IEEE 802.11a / b / g standard method and is widely used in notebook computers. ZigBee is an IEEE 802.15.4 standard. It is a low-power, 250Kbps transmission technology that can be used for flashing lights that are not frequently transmitted, remote control of home appliances, and factory automation. Bluetooth is a wireless communication technology that can replace the cable of a computer and a printer as the IEEE 802.14.1 standard, and is used when low power and frequent communication occur, such as a mobile phone and an MP3 wireless earphone.

In particular, UWB is the IEEE 802.15.3a standard. UWB technology is the most suitable technology to wirelessly transmit and receive most existing data including high-definition video data due to the high transmission speed of several hundred Mbps compared to WLAN, Bluetooth, and Zigbee. This is in the limelight.

However, since most UWB technologies are considered to use the pulse position modulation method, very accurate time synchronization is required for transmission and reception, and a special antenna having excellent ultra-wideband frequency characteristics should be used. In addition, since the signal is distributed over a wide band, it may affect other communication, and even though the average power is small, the peak power is large, which may cause an impairment of other systems due to impulse electromagnetic waves.

In the conventional WPAN technology operating as described above, the UWB technology is capable of transmitting and receiving data at a high transmission speed, but the transmission distance is limited to within 10m, so if there is a wall in the house, it does not pass well The disadvantage is that mobility is not guaranteed.

In addition, most zone-based services, such as ZigBee and Bluetooth, which are based on access points (APs), are slower than the speed of using wired LAN or UWB technology because they are low-speed transmission-oriented data or control signals. .

Accordingly, the present invention provides a broadcast service method and apparatus using ultra-wide band in a wireless communication system capable of broadcasting multimedia data to a plurality of UWB terminals in a zone based on an access point (AP) using UWB's high-speed transmission technology. .

In addition, the present invention is a high-speed transmission technology of the UWB broadcasting using ultra-wideband in a wireless communication system to add a broadcast function profile to the UWB PHY / MAC structure to enable the multimedia data broadcasting to a plurality of UWB terminals in the zone from the AP Provide service methods and devices.

According to an embodiment of the present invention, there is provided a method of discovering an AP by at least one UWB terminal located in a zone starting from an access point (AP) connected to an ultra wideband (UWB) wireless communication network. Requesting a UWB broadcast service by connecting to and via a UWB; selecting a desired broadcast from broadcast service information received from the AP in response to the request; and requesting transmission of the selected broadcast to the AP. And receiving a broadcast stream from the AP.

In another aspect, the present invention is characterized by adding a broadcast service profile using UWB on top of a UWB physical (PHY) layer / UWB media access control (MAC) layer.

The present invention also includes a process of requesting an AP to stop a broadcast service, and receiving a response from the AP to stop a broadcast service.

The present invention also includes a process of requesting UWB disconnection from the AP and a process of receiving a UWB disconnection from the AP.

In another embodiment of the present invention, the method includes periodically transmitting an AP discovery signal to at least one UWB terminal located in a zone starting from an access point (AP) connected to an ultra-wideband (UWB) wireless communication network; Performing a UWB connection with the UWB terminal that has received the AP discovery signal; transmitting a broadcast service information request message from the connected UWB terminal to the UWB terminal; If the broadcast service selection information is received from the step of transmitting the broadcast stream to the UWB terminal.

In another aspect, the present invention is characterized by adding a broadcast service profile using UWB on top of a UWB physical (PHY) layer / UWB media access control (MAC) layer.

The present invention also includes transmitting a broadcast service stop message to the at least one UWB terminal and stopping the broadcast service.

The present invention also includes transmitting a UWB disconnect message to the at least one UWB terminal, and performing the UWB disconnection.

An apparatus of an embodiment of the present invention is connected to a plurality of ultra-wideband (UWB) access points (AP), UWB wireless communication network for performing data transmission and reception services using UWB technology, and is connected to the UWB wireless communication network, The AP service is periodically transmitted to at least one UWB terminal located in a zone to perform a UWB connection with a UWB terminal that wants to connect and receives a broadcast service information request message from the connected UWB terminal. When the information is transmitted to the UWB terminal and broadcast service selection information is received from the UWB terminal, an AP for transmitting a corresponding broadcast stream to the UWB terminal is connected to the discovered AP and the UWB, and the connected AP is connected. When a UWB broadcast service is requested and broadcast service information is received from the AP, a desired broadcast is selected from the broadcast service information. And a UWB terminal transmitting to the AP and receiving a broadcast stream from the AP.

In another aspect, the present invention is characterized by adding a broadcast service profile using UWB on top of a UWB physical (PHY) layer / UWB media access control (MAC) layer.

In addition, the UWB terminal in the present invention, characterized in that the request to stop the broadcast service to the AP, and receives a response to stop the broadcast service from the AP.

Meanwhile, in the present invention, the UWB terminal may request UWB disconnection from the AP and receive a UWB disconnection response from the AP.

Also, in the present invention, the AP may transmit a broadcast service stop message to the at least one UWB terminal and stop the broadcast service.

Meanwhile, in the present invention, the AP transmits a UWB disconnection message to the at least one UWB terminal, and performs the UWB disconnection.

In the present invention, the effects obtained by the representative ones of the disclosed inventions will be briefly described as follows.

In the present invention, since most zone-based services such as ZigBee and Bluetooth are low-speed transmission-oriented data or control signals, the zone-based service is controlled by low-speed control signals by using the broadcast profile function of UWB. It can be secured as a basis for transmitting high-speed multimedia data in the transmission method, and a plurality of users having a UWB terminal can receive high-speed broadcast data through an AP located in a zone through a zone-based service using UWB. It works.

Hereinafter, the operating principle of the present invention will be described in detail with reference to the accompanying drawings. In the following description of the present invention, when it is determined that a detailed description of a known function or configuration may unnecessarily obscure the subject matter of the present invention, the detailed description thereof will be omitted. Terms to be described later are terms defined in consideration of functions in the present invention, and may be changed according to intentions or customs of users or operators. Therefore, the definition should be made based on the contents throughout the specification.

The UWB technology used in the present invention is an innovative next-generation wireless transmission technology, which realizes a high data transfer rate of 100 Mbps, which exceeds 54 Mbps of IEEE 802.11a, and consumes less than 100 mW, thus catching up with the low power characteristics of Bluetooth. UWB technology, as the name suggests, processes data using a high frequency bandwidth of several GHz. It uses the highest data rate of 100Mbps but consumes only a few tens of mW.

This is roughly a tenth to a hundredth as compared to the power consumption of a cell phone or wireless LAN. The factors that enable faster system operation are that cell phones and wireless LANs use frequencies ranging from 1 to several tens of MHz, while ultra-wideband communications use frequencies from 100 GHz up to 1000 times higher. Because it is.

Using this frequency bandwidth, data transfer rates of 500 Mbps to 1 Gbps can be achieved even with existing technologies. However, with existing wireless technologies, achieving this level of speed is nearly impossible. Therefore, UWB technology uses the transmit / receive pulse method, which is a relatively simple data transmission structure, to realize a significantly lower power consumption rate than the existing technology.

Each pulse used to transmit and receive data consists of microwaves ranging from 1ns up to hundreds of ps. In addition, the transmit power of each pulse is also very low at 10nW / MHz. This is below the level of electromagnetic noise produced by the equipment. On the other hand, because data transmission and reception are discontinuous, data reach is limited, but circuit consumption can be greatly reduced.

In the present invention, the UWB technology described above is used, and by adding a broadcast service profile (Local Broadcasting) to enable a broadcast service to the UWB PHY / MAC structure, the UWB fast transmission technology to which the broadcast service profile is added is used. In this way, it is possible to broadcast multimedia data to a plurality of UWB terminals in a zone starting from an access point (hereinafter referred to as an AP).

1 is a diagram illustrating a UWB PHY / MAC structure according to a preferred embodiment of the present invention.

Referring to FIG. 1, the UWB PHY / MAC structure proposed by the WiMedia Alliance includes a physical layer 100 and a media access control of a multi-band Orthogonal Frequency Division Multiplexing (MB-OFDM) scheme. By using the (MAC: Media Access Control) layer 105, in addition to the wireless Universal Serial Bus (USB) 110 as a wireless module, a high performance serial bus (IEEE1394) 115, Bluetooth 120, and WiNET 125 Allows multiple applications for higher layers such as) to be used simultaneously.

Referring to the data transfer functions available through the UWB technology, the wireless USB 110 function can enable file transfer as a wireless method using the function of current wired USB 2.0, and IEEE 1394 (115). ) Supports transmission speeds of up to 400Mbps, connecting to video conferencing, video production, small high-speed networks, high-speed printing, and entertainment equipment.

In addition, the Bluetooth 120 is a wireless communication that can replace the cable of the computer and the printer, the line of the mobile phone and earphones, a technology that was mainly used when low-power and frequent communication occurs, such as a mouse, keyboard, wireless earphones, Combining with UWB enables the integration of low power, low cost, ad hoc networking, built-in security, and wireless devices, which are the advantages of Bluetooth, while enabling the high-speed transmission of large data, which is the advantage of UWB technology. WiNET 125 is an IP-based application profile and performs a function of IP-based wireless networks.

Meanwhile, UWB PHY / MAC enables mobile phone based PAN services to be provided in mobile communication systems through linkage with Wireless Internet Platform for Interoperability (WIPI) / Personal Area Network (PAN) platform 135. In connection with the standard WIPI, the UWB technology enables mobile phones to access the wireless Internet network.

Through this, UWB technology including profiles for the above transmission technologies (WUSB, Bluetooth, IEEE1394, WiNET) can transmit and receive data between users without going through the mobile communication network, as well as various application businesses and mobile phones linked to the mobile communication network. In addition, it enables the implementation of ubiquitous network through linkage with automobile home network.

Accordingly, the present invention is to add a broadcast profile 130 in addition to four profiles such as wireless USB (110), IEEE1394 (115), Bluetooth 120, WiNET (125) that can be implemented using UWB technology.

Therefore, the broadcast profile 130 is a set of profiles that can apply functions suitable for a broadcast service, and includes a local broadcasting function, a low data rate (LDR) function, a streaming function, and the like. Among them, a local broadcasting function is to perform a broadcast service capable of broadcasting to a terminal to which a plurality of UWB technologies are applied in a zone from the AP.

Meanwhile, although the embodiment of the present invention has been described based on the MB-OFDM UWB technology, the present invention can also be applied to the UWB technology of the direct sequence code division multiple access (DS-CDMA) method. Of course. That is, the UWB physical layer is a DS-CDMA scheme, and by adding a broadcast service profile on the profile of the UWB technique using the DS-CDMA scheme, a broadcast service is possible.

2 is a diagram illustrating a broadcast service structure using a UWB AP according to a preferred embodiment of the present invention.

Referring to FIG. 2, the wireless communication network 220 operates from a wireless communication system or a mobile communication system, and performs high-speed data transmission and reception through UWB technology combined with an interface such as WUSB, IEEE1394, and Bluetooth WiNET. In addition, the plurality of UWB APs 210 are connected by wire and perform a broadcast service through the plurality of UWB APs 210.

The UWB AP 210 is connected to a plurality of UWB terminals located in a zone using UWB technology, thereby performing data transmission and reception and broadcasting service. To this end, the UWB AP 210 periodically transmits an AP discovery signal to a plurality of UWB terminals 202, 204, and 206 located in the zone 200, so that the plurality of UWB terminals 202, 204, and 206 are UAB APs. Search for 210 to allow connection.

A plurality of UWB terminals 202, 204, and 206 located in the zone 200 starting from the UWB AP 210 perform call processing with each other using a mobile communication system, and are connected to the UWB AP 210 to transmit and receive data. And reception of a broadcast service. In order to receive such a broadcast service, the plurality of UWB terminals 202, 204, and 206 search for the UWB AP 210, and when the discovered AP exists in a specific zone, the plurality of UWB terminals 202, 204, 206 selects the discovered UWB APs 210 so that connections are made to each other.

Accordingly, the plurality of UWB terminals 202, 204, and 206 transmit a request message for a specific broadcast service to the UWB AP 210, and the UWB AP 210 transmits a broadcast service request message to the mobile communication network 220. Thereafter, the mobile communication network 220 transmits the multimedia data to the UWB AP 210, and the UWB AP 210 transmits the broadcast service requested by each terminal to the plurality of terminals 202, 204, and 206.

Here, the zone 200 may be a Starbucks coffee shop, a movie theater such as CGV, or a SK gas station. The content transmitted here may be cinematic information such as movie trailers, point of view and main character interviews in movie theaters, and in coffee shops such as Starbucks, broadcast movie and music video video trailers and coffee shop advertisements or new menus. SK gas stations can also broadcast nearby information (restaurants, travel destinations) and traffic information.

3 is a flowchart illustrating a broadcast service operation procedure using a UWB AP according to a preferred embodiment of the present invention.

Referring to FIG. 3, first, the AP and the wireless network terminal are referred to as a server 300, and a terminal in which the UWB technology is implemented is referred to as a terminal 306.

The server 300 and the terminal 306 perform initialization for a wireless communication connection in step 308. The server 300 initializes and configures a channel through a server-side Radio Communication Links (RCL) 302 in step 310. In step 312, the terminal 306 performs initialization through the terminal-side RCL 304.

Thereafter, the server 300 and the terminal 306 perform a connection operation in step 314. In step 316, the server 300 receives a connection request message from the terminal 306 through the server-side RCL 302. Check the signal strength.

In step 318, the terminal 306 scans the server 300 through the terminal-side RCL 304 to request the connection to the server 300 when the server 300 is scanned. Check the signal strength.

In this case, the server 300 and the terminal 306 may perform a secure connection during the connection operation as in step 320.

Thereafter, the server 300 and the terminal connected to each other perform the service in step 306, 322, and the service execution step of 322 is an algorithm added according to local broadcasting among broadcast profiles added to the UWB.

In detail, in operation 324, the terminal 306 searches for a UWB service broadcast from the connected server 300. In operation 326, the server 300 transmits broadcast service information or a record to the terminal 306, and in step 328, the user of the terminal 306 selects a desired broadcast from the received broadcast service information.

When the terminal 306 transmits the broadcast service request message selected through the UWB channel in the steps 330 and 332 on the server 300, in step 334, the server 300 receives the broadcast service selection information, and thus the UWB channel is received. The requested broadcast stream is transmitted to the terminal 306 through the terminal.

If the terminal 306 user wants to stop watching the broadcast service in step 336, the terminal 306 receives a terminal termination command from the user in step 338, and the terminal 306 terminates the broadcast stream in step 340. ) Or transmits a broadcast service termination request message to the server 300, and disconnects the connection from the server 300 in step 342. Since the server 300 receives the broadcast stream termination request message from the terminal 306, the server 300 transmits the broadcast stream termination response message to the terminal 306, and terminates the broadcast stream in step 344.

However, when the server 300 wants to stop the broadcast service transmission in step 346 or when the broadcast service stop command is issued from an upper end of the server 300, in step 348, the server 300 issues its own server shutdown command. In operation 350, a message indicating that the broadcast service is to be terminated is transmitted to the terminal 306. In step 352, the terminal 306 receives the broadcast service termination message from the server 300, and recognizes this. In step 352, the terminal 306 terminates the broadcast service.

When the server 300 or the terminal 306 wants to disconnect from each other after the broadcast service is terminated, the server 300 transmits a UWB disconnection message to the server-side RCL 302 in step 354, and the terminal 306 transmits the UWB disconnection message. In this case, if the terminal 306 transmits the UWB disconnect request message to the terminal-side RCL 304 in step 356, the server 300 receives the UWB disconnect request message. Thereafter, the UWB disconnection response message is transmitted to the terminal 356, and then disconnection is performed.

As described above, the present invention adds a profile for enabling a broadcast service to the UWB PHY / MAC structure, thereby using a UWB high-speed transmission technique to access a number of points in a zone from an access point (hereinafter referred to as an AP). It is possible to broadcast multimedia data to a UWB terminal.

Meanwhile, in the detailed description of the present invention, specific embodiments have been described, but various modifications are possible without departing from the scope of the present invention. Therefore, the scope of the present invention should not be limited to the described embodiments, but should be defined not only by the appended claims, but also by the equivalents of the claims.

As described above, the wireless communication system according to the present invention is suitable for enabling the transmission of high-speed multimedia data in the low-speed center control signal transmission using the existing AP using the broadcast profile function of the UWB.

1 illustrates a UWB PHY / MAC structure according to a preferred embodiment of the present invention;

2 is a diagram illustrating a broadcast service structure using a UWB AP according to an embodiment of the present invention;

3 is a flowchart illustrating a broadcast service operation procedure using a UWB AP according to a preferred embodiment of the present invention.

<Explanation of Signs of Major Parts of Drawings>

200: ZONE 210: UWB AP

220: wireless communication network 202, 204, 206: UWB terminal

Claims (10)

Discovering an AP by at least one UWB terminal located in a zone starting from an access point (AP) connected to an ultra-wideband (UWB) wireless communication network; Requesting a UWB broadcast service by connecting the discovered AP to a UWB network; Selecting a desired broadcast from broadcast service information received from the AP in response to the request; Requesting the AP to transmit the selected broadcast; Receiving a broadcast stream from the AP Broadcast service method using an ultra-wideband in a wireless communication system comprising a. The method of claim 1, The method, And a broadcast service profile using UWB on a UWB physical (PHY) layer / UWB media access control (MAC) layer in the protocol stack of the UWB. Periodically transmitting an AP discovery signal to at least one UWB terminal located in a zone starting from an access point (AP) connected to an ultra-wideband (UWB) wireless communication network; Connecting to the UWB terminal and the UWB network receiving the AP discovery signal; When the broadcast service information request message is received from the connected UWB terminal, transmitting corresponding broadcast service information to the UWB terminal; When the broadcast service selection information is received from the UWB terminal, transmitting the corresponding broadcast stream to the UWB terminal. Broadcast service method using an ultra-wideband in a wireless communication system comprising a. The method of claim 3, wherein The method, And a broadcast service profile using UWB on a UWB physical (PHY) layer / UWB media access control (MAC) layer in the protocol stack of the UWB. A UWB wireless communication network connected to a plurality of UWB access points to perform data transmission and broadcasting service using UWB technology; The AP is connected to the UWB wireless communication network, periodically transmits an AP discovery signal to at least one UWB terminal located in a zone, connects to the UWB terminal to be connected to the UWB network, and requests broadcast service information from the connected UWB terminal. An AP for transmitting the broadcast service information to the UWB terminal when receiving the message and transmitting the broadcast stream to the UWB terminal when receiving the broadcast service selection information from the UWB terminal; When the searched AP is connected to the UWB, the UWB broadcast service is requested to the connected AP, and broadcast service information is received from the AP, a desired broadcast is selected from the broadcast service information and transmitted to the AP. UWB terminal receiving a broadcast stream from the AP Broadcast service apparatus using an ultra-wideband in a wireless communication system comprising a. The method of claim 5, The device is And a broadcast service profile using UWB on the UWB physical (PHY) layer and the UWB media access control (MAC) layer in the protocol stack of the UWB. The method of claim 5, The AP, And transmitting a broadcast service stop message to the at least one UWB terminal and stopping the broadcast service. The method of claim 5, The AP, And a UWB disconnection message to the at least one UWB terminal, and performing the UWB disconnection. The method of claim 5, The UWB terminal, And a broadcast service stop request from the AP, and a broadcast service stop response from the AP. The method of claim 5, The UWB terminal, Requesting UWB disconnection from the AP and receiving a UWB disconnection from the AP.

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