JP5591954B2 - Method and apparatus for quieting a transmitter in a white space device - Google Patents

Description

Related technology

Cross-reference of related applications
This application is expressly incorporated herein by reference in its entirety. 1) US Provisional Patent Application No. 61 / 292,391, filed January 5, 2010, in the name of Ravenendran et al., 2) US Provisional Patent Application No. 61 / 298,494, filed January 26, 2010, in the name of Ravenendran et al., And 3) US Provisional Patent Application, filed March 2, 2010, in the name of Ravenendran et al. Claim the benefit of 61 / 309,534.

  The present disclosure relates generally to a television white space device operable to communicate information via a television white space, and more particularly to a system for operating a transmitter and a sensor in the television white space. And methods.

  The Federal Communications Commission (FCC) generates all non-Federal use of the radio spectrum (including radio and television (TV) broadcasts) and all interstate telecommunications (wire, satellite and cable), as well as in the United States Or is an independent US government agency responsible for regulating all international communications that end. In 2008, the FCC issued a rule authorizing unlicensed signal operation on unused TV channels (ie, white space). However, this approved unlicensed use is subject to protection appropriately configured for the primary user of the TV band. The primary users of the TV band are ATSC / NTSC (National Television System Committee) transmitters such as TV broadcasters and licensed wireless microphones. This new rule allows wireless technology to use TV white space as long as the technology and the resulting signal transmission do not interfere with existing primary users. Therefore, periodic sensing is required to detect other signals. In this disclosure, various devices that use such technology to access this TV white space will be referred to as “white space devices”, “unlicensed devices”, and the like.

  It is desirable to distribute content wirelessly to television (TV) and other monitors. As an example, in some instances it may be desirable to have content delivered from a user device for output on a TV device. For example, compared to many TV device output functions, mobile phones, personal information terminals (PDAs), media player devices (eg, APPLE® IPOD® devices, other MP3 player devices, etc.), wrapping Many portable user devices, such as top computers and notebook computers, have limited / constrained output capabilities such as small display size. For example, a user who wants to view video on a portable user device may get an improved audiovisual experience when video content is delivered for output on a TV device. Thus, in some examples, a user is on a monitor with an ATSC tuner (eg, an HDTV device) in search of an improved audiovisual experience when receiving (eg, browsing and / or listening to) content. For output, it may be desired to distribute the content from the user device via white space. However, transmission to a television device over white space requires a sense that would interfere with the audiovisual experience.

  The present disclosure relates generally to white space devices that are operable to communicate information over white space, and more particularly to quiet a transmitter to sense an existing signal in a television white space. The present invention relates to a system and method for quiet. In one embodiment, a method for inconspicuous tranquilization of a transmitter in a white space device is generated from an application layer for transmission by a white space device transmitter to generate a null window of time. Inserting data into the transport stream. The time null window does not contain the required information. The method also includes transmitting the transport stream by the transmitter of the television white space device. The method senses an existing signal in white space by the white space sensor of the white space device during a null window of time.

  According to another aspect of the present disclosure, a white space device has a transmitter configured to transmit multimedia data in a transport stream over the white space. The white space device also has an application layer encoder configured to insert data into the transport stream to generate a null window of time. The white space device also has a white space sensor configured to sense signals in the white space during a null window of time.

  In yet another aspect, the white space system includes means for inserting data into the transport stream from the application layer to generate a null window of time. The system also includes means for transmitting the transport stream over the white space and means for quieting the transmission means during a null window of time.

  In a further aspect, a computer readable medium records program code for inconspicuous quietness of a transmitter of a white space device. The program code includes program code for inserting data into the transport stream from the application layer to generate a null window of time. The program code also includes program code for transmitting the transport stream over the white space. The program code also includes program code for sensing an existing signal in white space during a null window of time.

For a more complete understanding of the present disclosure, reference is now made to the following description, taken in conjunction with the accompanying drawings.
1 is a diagram of an example system in which embodiments of the present disclosure may be implemented. FIG. 3 is an exemplary big frame declaration according to an aspect of the present disclosure. FIG. 4 is an example multiplexing diagram according to one aspect of the present disclosure. FIG. 4 is an example multiplexing diagram according to one aspect of the present disclosure. FIG. 3 illustrates an example operational flow according to one aspect of the present disclosure.

  The word “exemplary” is used herein to mean serving as an example, instance, or illustration. Any embodiment described herein as "exemplary" is not necessarily to be construed as preferred or advantageous over other embodiments.

  White space devices generally refer to unlicensed wireless transceivers that communicate over unused spectrum in the television band. These devices generally operate in a cognitive manner, and the devices initially begin with TV band signals from authorized primary users (eg, Advanced Television Systems Committee (ATSC), National Television Systems Committee (NTSC), and some Scan to detect the wireless microphone protocol), and then select an unused channel to avoid interference with the grant signal.

  The white space device can be communicatively coupled to or incorporated within the user device, so that the white space device can be transmitted from the user device to the TV receiver device (eg, HDTV) via the TV white space. Information (eg, multimedia content) may be delivered to the device. Exemplary implementations of white space devices are further described herein. However, various implementations of such a white space device are possible, and any implementation of a white space device that is operable to deliver information from a user device over a TV white space is within the scope of this disclosure. Is within.

  In order for the white space device to operate in white space, some sense is performed (eg, to identify / confirm unused “white space” available in the TV band). Thus, a white space device calms its transmitter during periodic time intervals during which sensing can be performed by the device. In one embodiment, “quiet” includes turning the transmitter off, but in other embodiments, quieting filters the transmission, switches the transmission to a non-interfering frequency, or senses. Including some other act that allows to be done.

  Does not affect / degrade (or reduce / minimize impact / degradation) the quality of the transport stream being transmitted (eg, to enable a high quality audio / visual experience for the user) It is desirable to employ a method for quieting the transmitter in a) manner. In other words, it is desirable to quiet the transmitter without noticeable. This is when a user wants to deliver video multimedia content from a portable user device for output on a TV device (eg, an HDTV device) in search of an improved audiovisual experience. May be particularly desirable for applications involving real-time transmission / streaming of video, audio, and / or other content.

  Embodiments of the present disclosure are directed to quieting the transmitter of a white space device to sense a white space signal. Quiet is defined by transmitted transport streams (eg, moving pictures expert group (MPEG) -2 transport streams (TS), real-time transport protocol (RTP) transport streams, and transport streams) output by white space devices. Implemented in a manner that reduces or minimizes degradation to the Port Control Protocol (TCP) stream). In addition, it is often necessary to quiet the transmitter periodically to allow sensing to be performed by the white space device (eg, audio / s being transmitted for display). Reduce or minimize transmission degradation of content contained in transport streams being transmitted by whitespace devices (so that disruption to real-time streaming of visual information is reduced or minimized) It is desirable to quiet the transmitter in a manner.

  As described further herein, to allow several time frames available to quiet the transmitter inconspicuously (ie, audio / visual displayed on the receiving HDTV device) Various techniques for managing streaming of content (eg, multimedia content) may be employed such that disruption to information is reduced or minimized. This is generally referred to herein as “inconspicuous” transmitter quiescence.

As described further below, the embodiments of the present disclosure provide various implementations that employ application layer techniques for inconspicuous transmitter silence in white space devices. The related U.S. patent application no. No. [Attorney Docket No. 100701] describes an exemplary transport layer technique for modifying a transport stream for inconspicuous transmitter silence in a white space device.

  FIG. 1 is a diagram of an example system 100 in which embodiments of the present disclosure may be implemented. System 100 includes an exemplary user device 101, sometimes referred to as a “host” device. An exemplary implementation of user device 101 is shown in FIG. 1 in block diagram form. In the illustrated example, the user device 101 is shown as a mobile device, but in other embodiments the user device 101 need not be a mobile device. An exemplary user device 101 generally includes one or more processors, such as a media processor 104, a display processor 105, and / or an audio output processor 106, such that the user device 101 includes an embedded display 107 and an embedded speaker 108, etc. May have embedded input / output devices. Of course, the user device 101 may be configured differently in a given implementation (eg, may include different functional blocks and / or additional functional blocks than those shown in FIG. 1), and any such Various implementations are also within the scope of this disclosure.

  User device 101 is generally operable to generate content that can be output via its embedded output devices (eg, embedded display 107 and embedded speaker 108). Various types of content to be output on the user device are well known in the art, and any such content can be output on the user device 101 in a given application. For example, a multimedia player application may be running on the user device 101 to output multimedia content (eg, a movie). Of course, other content such as text content and / or other graphical / image and / or audio content (e.g., email content, web browsing content, video game content, word processing content, etc.) may be stored on the user device 101 by the user. May be output in a given application that may be interacting with.

  A user can (eg, on) one or more human interface input devices (not shown in FIG. 1) such as a pointer device (eg, mouse), joystick, keyboard, touch screen interface, microphone, etc. Information for interacting with the running application may be entered into the user device 101. In some examples, such user input information may cause some output to be generated or modified. For example, the input of the user's mouse movement may cause the pointer to move correspondingly on the embedded display 107 of the user device 101.

  The exemplary system 100 also includes a white space device 102, an exemplary implementation of which is shown in block diagram form in FIG. White space device 102 is communicatively coupled to such user device 101 to receive information from user device 101. In one embodiment, the white space device 102 is a separate device that may be referred to as a “dongle” that is communicatively coupled to the user device 101. The white space device 102 can be any suitable connection that allows information from the user device 101 to be captured by the white space device 102 via a USB connection, a PCIe interface, or as further described herein. Can be combined in a manner. For example, the white space device 102 communicates to the user device 101 via any suitable type of wired connection or via a wireless communication connection such as wireless USB (WUSB), Bluetooth, 802.11, etc. Can be combined as possible.

  The white space device 102 captures information from the user device 101. For example, the captured information includes content that is output via an output device, such as “video out” 126 and / or “audio out” 127, as shown in FIG. As described further herein, in some embodiments, “human interface device” (HID) data, eg, user input commands (eg, mouse movement, joystick movement, keyboard input, and / or (one Other information such as (or other commands received via the human interface device) may also be captured by the white space device 102. The white space device 102 is, for example, such that content captured from the user device 101 (eg, multimedia content) is monitored by a device such as a high definition television (HDTV) 103 shown in FIG. In order to be able to be received and output, the information captured from the user device 101 is operable to be wirelessly transmitted by the transmitter 116 over the wireless communication 123 via the TV white space.

  In the example shown in FIG. 1, the white space device 102 transmits an Advanced Television Systems Committee (ATSC) signal over the white space channel wirelessly, thereby effectively acting as a television station transmitter. Accordingly, as shown in block diagram form, the example white space device 102 of FIG. 1 includes an ATSC baseband processor and transmitter 109. As is known in the art, ATSC is compatible with the well-known MPEG-2 Transport Stream (TS), so that the exemplary white space device 102 is Audio / video decoder 111 for encoding the captured information, eg MPEG-2 / AC-3. The encoded data is transmitted via the multiplexer 150 to the transport encoder 112, for example, an MPEG-2 TS encoder. The transport stream packets are then sent to the RF transmission system 113 (and transmitter (eg, antenna) 116) for wireless transmission over the white space 123.

  The HDTV 103 can receive and process ATSC signals (eg, MPEG-2 TS) for output to the display and / or speakers of the HDTV device 103 so that the embedded wireless receiver 124 and the embedded ATSC tuner / A receiver (eg, a conventional television tuner) 125 is included.

  The example white space device 102 of FIG. 1 further includes a control module 110 having a white space spectrum sensor 120 for sensing TV white space (eg, for sensing signals within the TV white space). Such a sensor 120 periodically performs sensing to determine the available TV white space. The frequency manager logic 118 may adjust the channel when it is necessary to maintain transmission of the white space device within the determined available white space. As further described herein, a transmission is performed to allow the sensor 120 to perform its sense while such quiescence is being performed to improve the quality of the sense. An embodiment is provided for quieting the machine 116 inconspicuously.

  Of course, the ATSC is just one example of a set of television transmission standards that may be employed by the white space device 102, and in other embodiments, to transmit media content over the white space, the ATSC standard, DVB (Digital Any of various television standards such as a Video Broadcasting (IS) standard, an ISDB (Integrated Services Digital Broadcasting) standard, and a DMB (Digital Multimedia Broadcast) standard can be employed.

  As described above, the exemplary white space device 102 of FIG. 1 is ATSC compatible for transmitting information captured from the user device 101 and is therefore received and processed by the ATSC receiver / tuner 125 of the HDTV 103. To an MPEG-2 transport stream that can be

An exemplary application layer implementation.
Various techniques can be employed to quieten the white space device transmitter inconspicuously by techniques within the application layer according to the present disclosure. For example, assume that a transmission stream rate of 30 frames per second (fps) is used, which implies that each frame is approximately 33 ms. Further assume that a 10 ms window is desired within each second for sensing (eg, by the white space sensor 120 of FIG. 1). The transmitter of the white space device (eg, transmitter 116 of FIG. 1) will be quieted during such a 10 ms sensing window. To allow such a 10 ms window to become unobtrusively available to quiet the transmitter (ie for multimedia information being transmitted for reception and output on the receiving HDTV device) It is desirable to employ application layer techniques to manage the streaming of content (eg, multimedia content) from the transmitter of the white space device (so that disruption is reduced or minimized). In some embodiments, the sensing is performed without actually calming the transmitter.

  The ATSC defines one band of TV signals that may be used by the white space device 102 in some embodiments. For transport, ATSC uses the MPEG-2 system specification known as the MPEG-2 transport stream to encapsulate data, as described above. Three exemplary implementations for employing application layer techniques to enable inconspicuous transmitter quiescence in such MPEG-2 transport streams according to embodiments of the present disclosure are described below.

Exemplary implementation 1 (use of “big frame”):
As shown in FIG. 2, video encoder 111 receives the frame so that a receiver (eg, receiver 125 of FIG. 1) recognizes a standard frame in transport stream 200 as spanning at least one frame. Identify as “Big Frame”. When a big frame spans multiple frames, the standard frame actually spans only a single frame, so that an additional frame (or at least a portion of the additional frame) can be used for sensing "null" Is available as a window. For example, assume that the frame rate is 30 fps. As the 29th frame in each period is buffered and utilized by the receiver 125 for two frame periods, the 29th frame in each period is designated as a “big frame” (eg, in its header). Can be declared. Such designation of a frame as a “big frame” is supported by MPEG-2. In this way, the control module 110 can synchronize sensing (eg, with the sensor 120 of FIG. 1) with the occurrence of the 30th frame in each second. Since the “big frame” was transmitted during the 29th frame period, transmission is not required during the 30th frame period, that is, data from the 29th frame is used during the 30th frame period. This option is a multiplexing independent coding solution.

  In some embodiments, the position of the designated big frame may not be fixed at a given position within the frame period, but may vary (eg, randomly) within the frame period. Sensing (by sensor 120) can also vary to synchronize with the null window at the time immediately following the standard frame designated as the big frame. Video encoder 111 designates a “big frame” and control module 110 synchronizes sensing by white space device 102 (eg, by sensor 120) with the occurrence of “big frame”.

Exemplary implementation 2 (using still picture picture flag):
Another application layer technique includes a video encoder 111 that transmits a still picture picture flag of an MPEG-2 transport stream at a predefined time interval on a unique program ID (eg, during a time interval of 10 ms per second). . As shown in FIG. 3, the program 301 is set to have a higher priority than the primary program 200 for multiplexing in the multiplexer 150. By multiplexing this higher priority program 301 containing the still image picture flag with the primary program 200, the modified transport stream 302 has been shown, or has been transmitted with a still image inserted. Contains a still image flag when considered to be present. The control module 110 can quiesce (and initiate a sense) the transmitter 116 that is synchronized with a portion of the stream 302 labeled with a still image picture flag. By using the still image picture flag, timing as well as audio can be ignored. In this example, still images are not actually sent. Instead, tranquilization is synchronized with the timing at which a still image will be sent. Therefore, not transmitting at this point does not affect the content displayed on the monitor.

Exemplary implementation 3 (inserting an additional program with some characteristics into the stream):
The disclosure of which is expressly incorporated herein by reference, including the exemplary techniques disclosed in co-filed U.S. Patent Application No. [Attorney Docket No. 100701] filed at the same time, including ( Various techniques for quieting the transmitter (eg, by modifying the transport stream) may be employed at the transport layer. The transport stream can be modified in various ways, for example, to arrange several NULL packets together within the transport stream. For example, a sensing window (eg, 10 ms) may be achieved by sending a NULL data packet in the transport stream. The MPEG-2 multiplexer inserts null packets to make up for the required bandwidth. The location of these NULL packets can be modified in such a way that no actual data is sent for a continuous period of eg 10 ms.

  One way to guarantee a predetermined number of null packets in the transport stream is to include this additional program with NULL data (with a corresponding program ID or “PID”), this particular PID is always in place. (Eg, at the end of each second) to cause multiplexer 150 to engineer the transport stream. In some embodiments, the video bit rate of such inserted programs can vary / fluctuate.

  However, rather than modifying the transport stream, various techniques for achieving the desired transmitter quiet period can be achieved by the application layer. For example, in one embodiment, instead of multiplexing programs with varying bit rates, a dummy program 401 with a static video input to multiplexer 150 in addition to primary program 200 is shown in FIG. Yes. The bit rate of the dummy program 401 matches the time interval at which sensing is to be performed. The video encoder 111 creates a dummy program 401 having a fixed picture group (GOP) structure. The GOP structure starts at the time when sensing is to occur. The beginning of the GOP structure includes higher priority frames, eg, I frames. Therefore, when the dummy program 401 is multiplexed with the primary program 200, a null window is generated in the correction program 402 in synchronization with the beginning of each GOP structure. The quieting of the transmitter can be scheduled to occur in synchronization with the beginning of the GOP structure in the dummy program 401. Therefore, the control module 110 can synchronize the sensing with the fixed / static period of the added program 401. In other embodiments, the null window is formed at a time other than the beginning of each GOP structure.

  FIG. 5 illustrates an inconspicuous quietness of a transmitter (eg, transmitter 116 of FIG. 1) in a television white space device (eg, white space device 102 of FIG. 2), according to one embodiment of the present disclosure. An exemplary operational flow is shown. At block 501, application layer information is inserted to create a null window of time in the modified transport stream. At block 502, the modified transport stream is transmitted. During these time null windows, the white space transmitter is quieted and sensed to detect existing signals in the white space.

  In one configuration, the television white space device transports from the application layer for transmission by the transmitter of the television white space communication device to generate a null window of time in the transport stream at a given time. Means for inserting information into the stream; For example, such means for inserting this information may be video encoder 111.

  The device may further comprise means for transmitting the transport stream. For example, the transmitter 116 shown in FIG. 1 may be implemented. The device may further comprise means for sensing a signal in the white space during a time null window, such as the white space sensor 120 of FIG. The device may further include means for quieting the transmission means during the null window of time. For example, the control module 110 may perform this calming.

  In one configuration, the means for inserting information from the application layer into the transport stream may include means for multiplexing a program with static video and a fixed GOP structure with the transport stream. For example, multiplexer 150 may multiplex static video and video encoder 111 may encode static video.

  In one configuration, the means for inserting information from the application layer into the transport stream may include means for multiplexing a program including a still picture picture indication with the transport stream. For example, multiplexer 150 may multiplex still picture instruction and video encoder 111 may insert still picture instruction.

  In one configuration, the means for inserting information into the transport stream from the application layer is a means for declaring a standard frame present in the frame period of the transport stream as a big frame that should include a plurality of frames. Thus, a portion of these multiple frames may include means for declaring to form a null window of time. For example, video encoder 111 may declare a frame as a big frame.

  Those of skill in the art will understand that information and signals may be represented using any of a variety of different technologies and techniques. For example, data, instructions, commands, information, signals, bits, symbols, and chips that may be referred to throughout the above description are voltages, currents, electromagnetic waves, magnetic fields or magnetic particles, light fields or optical particles, or any of them Can be represented by a combination.

  Further, those skilled in the art will recognize that the various exemplary logic blocks, modules, circuits, and algorithm steps described in connection with the disclosure herein may be implemented as electronic hardware, computer software, or a combination of both. Will be understood. To clearly illustrate this interchangeability of hardware and software, various illustrative components, blocks, modules, circuits, and steps have been described above generally in terms of their functionality. Whether such functionality is implemented as hardware or software depends upon the particular application and design constraints imposed on the overall system. Those skilled in the art may implement the described functionality in a variety of ways for each particular application, but such implementation decisions should not be construed as departing from the scope of the present disclosure.

  Various exemplary logic blocks, modules, and circuits described in connection with the disclosure herein may be general purpose processors, digital signal processors (DSPs), application specific integrated circuits (ASICs), field programmable gate arrays (FPGAs), or others. Programmable logic device, individual gate or transistor logic, individual hardware components, or any combination thereof designed to perform the functions described herein. A general purpose processor may be a microprocessor, but in the alternative, the processor may be any conventional processor, controller, microcontroller, or state machine. The processor is also implemented as a combination of computing devices, eg, a combination of a DSP and a microprocessor, a plurality of microprocessors, one or more microprocessors associated with a DSP core, or any other such configuration. obtain.

  The method or algorithm steps described in connection with the disclosure herein may be implemented directly in hardware, implemented in software modules executed by a processor, or a combination of the two. A software module resides in RAM memory, flash memory, ROM memory, EPROM memory, EEPROM memory, registers, hard disk, removable disk, CD-ROM, or any other form of storage medium known in the art. Can do. An exemplary storage medium is coupled to the processor such that the processor can read information from, and write information to, the storage medium. In the alternative, the storage medium may be integral to the processor. The processor and the storage medium can reside in an ASIC.

  In one or more exemplary designs, the functions described may be implemented in hardware, software, firmware, or combinations thereof. If implemented in software, the functions may be stored on or transmitted over as one or more instructions or code on a computer-readable medium. Computer-readable media includes both computer storage media and computer communication media including any medium that facilitates transfer of a computer program from one place to another. A storage media may be any available media that can be accessed by a general purpose or special purpose computer. By way of example, and not limitation, such computer-readable media may be RAM, ROM, EEPROM, CD-ROM, or other optical disk storage, magnetic disk storage or other magnetic storage device, or any desired form in the form of instructions or data structures. Any other medium that can be used to carry or store the program code means and that can be accessed by a general purpose or special purpose computer or general purpose or special purpose processor can be provided. Any connection is also properly termed a computer-readable medium. For example, the software can use a coaxial cable, fiber optic cable, twisted pair, digital subscriber line (DSL), or wireless technology such as infrared, wireless, and microwave, from a website, server, or other remote source When transmitted, coaxial technologies, fiber optic cables, twisted pair, DSL, or wireless technologies such as infrared, radio, and microwave are included in the media definition. Discs and discs used in this specification are compact discs (CD), laser discs, optical discs, digital versatile discs (DVDs), floppy discs (discs). Includes a registered trademark disk and a Blu-ray registered disk, the disk normally reproducing data magnetically, and the disk optically reproducing data with a laser To do. Combinations of the above should also be included within the scope of computer-readable media.

Although the present disclosure and its advantages have been described in detail, it will be understood that various changes, substitutions and modifications can be made herein without departing from the technology of the present disclosure as defined by the appended claims. I want. Furthermore, the scope of the present application is not limited to the specific embodiments of the processes, machines, manufacture, compositions, means, methods and steps described herein. Those skilled in the art will readily appreciate from the present disclosure to perform substantially the same function or achieve substantially the same result as the corresponding embodiments described herein, existing or later. Any developed process, machine, manufacture, composition, means, method, or step may be utilized in accordance with the present disclosure. Accordingly, the appended claims are intended to include within their scope such processes, machines, manufacture, compositions of matter, means, methods, or steps.
Hereinafter, the invention described in the scope of claims of the present application will be appended.
[C1]
A method for inconspicuous calming of a transmitter in a white space device,
Inserting data into the transport stream to be transmitted by the transmitter of the white space device from the application layer to generate a null window of time;
Transmitting the transport stream;
A method comprising:
[C2]
Further comprising quieting the transmitter during a null window of the time;
The method according to [C1].
[C3]
Sensing further during the null window of time;
The method according to [C1].
[C4]
From the application layer, inserting the data into the transport stream,
Further comprising multiplexing a dummy program with a static video and fixed picture group (GOP) structure with the transport stream to form the time null window;
The method according to [C1].
[C5]
The time null window starts at the beginning of each GOP structure.
The method according to [C4].
[C6]
From the application layer, inserting the data into the transport stream,
A program including a portion flagged as the still picture picture is multiplexed with the transport stream to form a null window of time as corresponding to the portion of the transport stream in which the still picture picture is shown Further comprising
The method according to [C1].
[C7]
The inserting is
Declaring a standard frame present in a frame period of the transport stream as a big frame to span at least one frame period;
At least a portion of the at least one frame period forms a null window of the time;
The method according to [C1].
[C8]
The transport stream comprises one of a moving pictures experts group (MPEG) -2 transport stream, a real-time transport protocol (RTP) transport stream, and a transport control protocol (TCP) stream.
The method according to [C1].
[C9]
A transmitter configured to transmit multimedia data in a transport stream over white space;
An application layer encoder configured to insert data into the transport stream to generate a null window of time;
A white space sensor configured to sense a signal in the white space during the time null window;
A white space device.
[C10]
A multiplexer configured to multiplex a dummy program having a static video and fixed picture group (GOP) structure with the transport stream;
The device according to [C9].
[C11]
Multiplexing the transport stream with a program that includes a portion flagged as the still picture picture to form a null window of time as corresponding to the portion of the transport stream in which the still picture picture is shown Further comprising a multiplexer configured to:
The device according to [C9].
[C12]
The application layer encoder is configured to declare a standard frame present in a frame period of the transport stream as a big frame that should span at least one frame period, at least a portion of the at least one frame period being the time Form a null window,
The device according to [C9].
[C13]
The transport stream comprises a moving pictures experts group (MPEG) -2 transport stream,
The device according to [C9].
[C14]
The transport stream comprises a Real-time Transport Protocol (RTP) transport stream;
The device according to [C9].
[C15]
The transport stream comprises a Transport Control Protocol (TCP) stream;
The device according to [C9].
[C16]
Means for inserting data into the transport stream from the application layer to generate a null window of time;
Means for transmitting the transport stream via a white space;

Means for quieting the means for transmitting during the null window of time;
A white space system.
[C17]
The means for inserting data into the transport stream from an application layer comprises:
Means for multiplexing a dummy program with a static video and fixed picture group (GOP) structure with the transport stream to form the null window of time;
The system according to [C16].
[C18]
The means for inserting data into the transport stream from an application layer comprises:
Multiplexing the transport stream with a program that includes a portion flagged as the still picture picture to form a null window of time as corresponding to the portion of the transport stream in which the still picture picture is shown Further comprising means for
The system according to [C16].
[C19]
The means for inserting data into the transport stream from an application layer comprises:
Means for declaring a standard frame present in a frame period of the transport stream as a big frame to span at least one frame;
At least a portion of the at least one frame forms a null window of the time;
The system according to [C16].
[C20]
A computer readable medium having recorded thereon a program code for inconspicuous calming of a transmitter of a white space device, the program code comprising:
Program code for inserting data into the transport stream from the application layer to generate a null window of time;
Program code for transmitting the transport stream via white space;
Program code for sensing an existing signal in the white space during the time null window;
A computer-readable medium comprising:
[C21]
Further comprising code for multiplexing a dummy program with a static video and fixed picture group (GOP) structure with the transport stream to form the time null window;
The medium according to [C20].
[C22]
A program including a portion flagged as the still picture picture is multiplexed with the transport stream to form a null window of time as corresponding to the portion of the transport stream in which the still picture picture is shown Further comprising code for
The medium according to [C20].
[C23]
Further comprising code for declaring a standard frame present in a frame period of the transport stream as a big frame to span at least one frame, wherein at least a portion of the at least one frame forms a null window of the time To
The medium according to [C20].

Claims (21)

A method for quieting a transmitter in a white space device, the method performed by the device,
Inserting data from an application layer into a transport stream to be transmitted by the transmitter of the white space device to generate a null window of time;
Quieting the transmitter during the null window of time, where the calming is turning off the transmitter, filtering the transmission, and decoupling the transmission. Including switching to frequency or sensing,
Transmitting the transport stream. From the application layer, inserting the data into the transport stream,
Further comprising multiplexing a dummy program with a static video and fixed picture group (GOP) structure with the transport stream to form the time null window;
The method of claim 1. The time null window starts at the beginning of each GOP structure.
The method of claim 2. Inserting the data from the application layer into the transport stream,
A program including a portion flagged as the still picture picture is multiplexed with the transport stream to form a null window of time as corresponding to the portion of the transport stream in which the still picture picture is shown Further comprising
The method of claim 1. The inserting is
Declaring a standard frame present in a frame period of the transport stream as a big frame to span at least one frame period;
At least a portion of the at least one frame period forms a null window of the time;
The method of claim 1. The transport stream comprises one of a moving pictures experts group (MPEG) -2 transport stream, a real-time transport protocol (RTP) transport stream, and a transport control protocol (TCP) stream.
The method of claim 1. An application layer encoder configured to insert data into the transport stream to generate a null window of time;
A white space sensor configured to sense a signal in white space during the time null window ;
A white space device comprising: a transmitter configured to transmit the transport stream over the white space. A multiplexer configured to multiplex a dummy program having a static video and fixed picture group (GOP) structure with the transport stream;
The device according to claim 7. Multiplexing the transport stream with a program that includes a portion flagged as the still picture picture to form a null window of time as corresponding to the portion of the transport stream in which the still picture picture is shown Further comprising a multiplexer configured to:
The device according to claim 7. The application layer encoder is configured to declare a standard frame present in a frame period of the transport stream as a big frame that should span at least one frame period, at least a portion of the at least one frame period being the time Form a null window,
The device according to claim 7. The transport stream comprises a moving pictures experts group (MPEG) -2 transport stream,
The device according to claim 7. The transport stream comprises a Real-time Transport Protocol (RTP) transport stream;
The device according to claim 7. The transport stream comprises a Transport Control Protocol (TCP) stream;
The device according to claim 7. Means for inserting data into the transport stream from the application layer to generate a null window of time;
Means for transmitting the transport stream via a white space;
Means for quieting the means for transmitting during the time null window, the means for quieting means for turning off a transmitter, filtering the transmission Means, means for switching the transmission to a non-interfering frequency, or means for sensing,
White space system. The means for inserting data into the transport stream from an application layer comprises:
Means for multiplexing a dummy program with a static video and fixed picture group (GOP) structure with the transport stream to form the null window of time;
The system according to claim 14. The means for inserting data into the transport stream from an application layer comprises:
Multiplexing the transport stream with a program that includes a portion flagged as the still picture picture to form a null window of time as corresponding to the portion of the transport stream in which the still picture picture is shown Further comprising means for
The system according to claim 14. The means for inserting data into the transport stream from an application layer comprises:
Means for declaring a standard frame present in a frame period of the transport stream as a big frame to span at least one frame;
At least a portion of the at least one frame forms a null window of the time;
The system according to claim 14. A computer program comprising program code for quieting a transmitter of a white space device in at least one computer, said program code comprising:
Program code for inserting data into the transport stream from the application layer to generate a null window of time;
Program code for transmitting the transport stream via white space;
A computer program comprising program code for sensing an existing signal in the white space during the time null window. The program code, in order to form a null window of the time, further comprising program code for multiplexing said transport stream a dummy program with static video and fixed picture group (GOP) structure,
The computer program according to claim 18. The program code includes a program including a portion flagged as the still picture picture to form a null window of the time as corresponding to the portion of the transport stream in which the still picture picture is shown. Further comprising program code for multiplexing with the port stream,
The computer program according to claim 18. The program code further comprises code for declaring a standard frame present in a frame period of the transport stream as a big frame that should span at least one frame, wherein at least a portion of the at least one frame is the time Form a null window,
The computer program according to claim 18 .

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