EP2652943A1 - Procédé et appareil de transmission des données ayant un flux de données dans un système de diffusion sans fil - Google Patents
Procédé et appareil de transmission des données ayant un flux de données dans un système de diffusion sans filInfo
- Publication number
- EP2652943A1 EP2652943A1 EP11849822.9A EP11849822A EP2652943A1 EP 2652943 A1 EP2652943 A1 EP 2652943A1 EP 11849822 A EP11849822 A EP 11849822A EP 2652943 A1 EP2652943 A1 EP 2652943A1
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- European Patent Office
- Prior art keywords
- frequency
- frame
- data
- section
- data stream
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- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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Classifications
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N7/00—Television systems
- H04N7/015—High-definition television systems
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L5/00—Arrangements affording multiple use of the transmission path
- H04L5/0091—Signaling for the administration of the divided path
- H04L5/0092—Indication of how the channel is divided
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L12/00—Data switching networks
- H04L12/02—Details
- H04L12/16—Arrangements for providing special services to substations
- H04L12/18—Arrangements for providing special services to substations for broadcast or conference, e.g. multicast
- H04L12/1881—Arrangements for providing special services to substations for broadcast or conference, e.g. multicast with schedule organisation, e.g. priority, sequence management
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L27/00—Modulated-carrier systems
- H04L27/26—Systems using multi-frequency codes
- H04L27/2601—Multicarrier modulation systems
- H04L27/2602—Signal structure
- H04L27/261—Details of reference signals
- H04L27/2613—Structure of the reference signals
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L65/00—Network arrangements, protocols or services for supporting real-time applications in data packet communication
- H04L65/60—Network streaming of media packets
- H04L65/70—Media network packetisation
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N21/00—Selective content distribution, e.g. interactive television or video on demand [VOD]
- H04N21/20—Servers specifically adapted for the distribution of content, e.g. VOD servers; Operations thereof
- H04N21/23—Processing of content or additional data; Elementary server operations; Server middleware
- H04N21/238—Interfacing the downstream path of the transmission network, e.g. adapting the transmission rate of a video stream to network bandwidth; Processing of multiplex streams
- H04N21/2383—Channel coding or modulation of digital bit-stream, e.g. QPSK modulation
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L5/00—Arrangements affording multiple use of the transmission path
- H04L5/0001—Arrangements for dividing the transmission path
- H04L5/0003—Two-dimensional division
- H04L5/0005—Time-frequency
- H04L5/0007—Time-frequency the frequencies being orthogonal, e.g. OFDM(A), DMT
Definitions
- the present invention relates generally to broadcast systems, and more specifically, to a method and apparatus relating to transmission and reception of data streams in digital video broadcast systems.
- a broadcast system such as a Digital Video Broadcasting (DVB) system, may transmit data in the form of a sequence of frames.
- a DVB system may operate according to, for example, a DVB Terrestrial 2 nd Generation (DVB-T2) standard, or for example, the following families of standards: Advanced Televisions Systems Committee (ATSC), Integrated Services Digital Broadcasting (ISDB), or Digital Multimedia Broadcasting (DMB).
- Each frame typically includes a preamble section and a data section.
- the preamble section and the data section are time-multiplexed.
- the data section may carry data arranged in the form of a number of data streams, which may be referred to as Physical Layer Pipes (PLP).
- PLP Physical Layer Pipes
- a PLP or a plurality of PLPs may carry, for example, a service such as a video channel that is to be provided to a user.
- Reception of data from the frames, and reception of the data streams may be assisted by signalling, which may typically be carried in the preamble of the frame, in which case the signalling is referred to as Out-of-Band (OB) signalling.
- the signalling may also be carried in the data section, in which case the signalling is referred to as In-Band (IB) signalling.
- the signalling may be referred to as physical layer signalling, or Layer 1 (L1) signalling.
- the signalling may indicate a modulation or coding scheme to be used for decoding data, and it may, for example, indicate sections of a data field to be decoded, or the location of a data stream within the data section.
- signal compression techniques has increased, and lower data rate services, which may be more robust in particular in mobile environments, have been provided. Accordingly, the number of data streams carried by a sequence of frames is potentially large, but thinly spread in the sense that not every frame may carry all of the data streams. Because signalling is typically required relating to each data stream for each frame, the signalling may represent a large overhead per frame in terms of data capacity and receiver power consumption.
- an aspect of the present invention provides data transmission and reception techniques in a broadcast system.
- a method of transmitting data comprising a data stream in a broadcast system.
- the data stream is mapped onto a super-frame having a plurality of frames.
- Each of the plurality of frames includes a preamble section and a data section.
- the preamble section and the data section are time-multiplexed.
- the data section carries the data stream, and the preamble section carries at least signalling information.
- the data section of each of the plurality of frames is segmented into a plurality of frequency zones. Each of the plurality of frequency zones has a same position in a frequency domain for each of the plurality of frames.
- At least part of the data stream is mapped to a first frequency zone of the plurality of frequency zones for each of the plurality of frames.
- a signalling information word is generated that carries signalling relating to a position and a bandwidth of at least the first frequency zone in the frequency domain to assist in reception of the data stream.
- the signalling information word is included in the preamble section of at least a given frame of the plurality of frames.
- the preamble section is transmitted within a first frequency bandwidth and the first frequency zone is transmitted within a second frequency bandwidth.
- the first frequency bandwidth is greater than the second frequency bandwidth.
- a transmitter for transmitting data having a data stream in a broadcast system.
- the transmitter includes a mapping unit that maps the data stream onto a super-frame comprising a plurality of frames.
- Each of the plurality of frames includes a preamble section and a data section.
- the preamble section and the data section are time-multiplexed.
- the data section carries the data stream, and the preamble section carries at least signalling information.
- the mapping unit also maps at least part of the data stream to a first frequency zone of a plurality of frequency zones for each of the plurality of frames.
- the apparatus also includes a segmenting unit that segments the data section of each of the plurality of frames into the plurality of frequency zones.
- the transmitter further includes a generating unit that generates a signalling information word that carries signalling relating to the position and a bandwidth of at least the first frequency zone in the frequency domain to assist in reception of the data stream.
- the transmitter additionally includes a transmitting unit for transmitting the preamble section of at least a given frame of the plurality of frames, which includes the signalling information word, within a first frequency bandwidth and transmitting the first frequency zone within a second frequency bandwidth.
- the first frequency bandwidth is greater than the second frequency bandwidth.
- a method for receiving data having a data stream in a broadcast system.
- a preamble section of a given frame is received within a first frequency bandwidth.
- a signalling information word is received in the preamble section of the given frame.
- the signalling information carries signalling relating to a position and a bandwidth of at least a first frequency zone of a plurality of frequency zones in a frequency domain.
- the first frequency zone is received within a second frequency bandwidth based on the signalling information word.
- the first frequency bandwidth is greater than the second frequency bandwidth.
- the data stream having been mapped onto a super-frame, includes a plurality of frames, each frame includes a preamble section and a data section, the preamble section and the data section are time-multiplexed, the data section carries the data stream, and the preamble section carries at least signalling information.
- the data section of each of the plurality of frames is segmented into the plurality of frequency zones, each of the plurality of frequency zones has a same position in the frequency domain for the each of the plurality of frames, and at least part of the data stream is mapped to the first frequency zone.
- a receiver is provided for receiving data having a data stream in a broadcast system.
- the receiver includes receiving unit for receiving a preamble section of a given frame within a first frequency bandwidth, receiving a signalling information word in the preamble section of the given frame, wherein the signalling information carries signalling relating to a position and bandwidth of at least a first frequency zone of a plurality of frequency zones in a frequency domain, and receiving the first frequency zone within a second frequency bandwidth based on the signalling information word.
- the first frequency bandwidth is greater than the second frequency bandwidth.
- the data stream which is mapped onto a super-frame, includes a plurality of frames, each frame includes a preamble section and a data section, the preamble section and the data section are time-multiplexed, the data section carries the data stream, and the preamble section carries at least signalling information.
- the data section of each of the plurality of frames is segmented into the plurality of frequency zones, each of the plurality of frequency zones has a same position in the frequency domain for the each of the plurality of frames, and at least part of the data stream is mapped to the first frequency zone.
- FIG. 1 is a diagram illustrating a data frame, according to an embodiment of the present invention.
- FIG. 2 is a diagram illustrating signalling in a data frame, according to an embodiment of the present invention
- FIG. 3 is a diagram illustrating mapping of time interleaving frame segments to frequency interleaving zones, according to an embodiment of the present invention
- FIG. 4 is a diagram illustrating a transmitter system, according to an embodiment of the present invention.
- FIG. 5 is a diagram illustrating mapping of frequency interleaving zones to physical layer zones, according to an embodiment of the present invention
- FIG. 6 is a diagram illustrating a receiver, according to an embodiment of the present invention.
- FIG. 7 is a diagram illustrating a receiver, according to another embodiment of the present invention.
- FIG. 8 is a diagram illustrating mapping of frequency interleaving zones to physical layer zones in Mode A, according to an embodiment of the present invention.
- FIG. 9 is a diagram illustrating mapping of frequency interleaving zones to physical layer zones in Mode B, according to an embodiment of the present invention.
- FIG. 10 is a table showing the L1-config signalling field, according to an embodiment of the present invention.
- FIG. 11 is a table showing the L1-dynamic signalling field, according to an embodiment of the present invention.
- FIG. 12 is a table showing the L1-dynamic-Ext signalling field, according to an embodiment of the present invention.
- FIG. 13 is a table showing the L1-config signalling field, according to an embodiment of the present invention.
- FIG. 14 is a table showing the L1-dynamic signalling field, according to another embodiment of the present invention.
- FIG. 15 is a table showing a further example of the L1-dynamic-Ext signalling field, according to another embodiment of the present invention.
- FIG. 16 is a table showing IB signalling, according to an embodiment of the present invention.
- FIG. 17 is a table showing the L1-pre-signalling field, according to an embodiment of the present invention.
- FIG. 18 is a table showing the L1-config signalling field, according to another embodiment of the present invention.
- Embodiments of the present invention are described in the context of a Digital Video Broadcasting Next Generation Handheld (DVB-NGH) standard based on the 2 nd generation terrestrial DVB-T2 system.
- DVD-NGH Digital Video Broadcasting Next Generation Handheld
- FIG. 1 is a diagram illustrating a data frame, according to an embodiment of the present invention. Specifically, FIG. 1 shows a frame structure of a given one of the frames in the super-frame.
- the frame includes a preamble section and a data section.
- the preamble section includes sections P1 8, L1-Pre 10, L1-Config 12, L1-Dynamic 14, L1-Dynamic EXT 16 and, in this embodiment of the present invention, Add Parity AP1 18a, and further additional parity sections as indicated as Add Parity AP2 18b and Add Parity AP N 18c.
- the data section includes PLPs PLP1 4a, PLP2 4b and so on, i.e., PLPN.
- the PLPs are shown to be arranged sequentially in time, but in practice this need not be the case. Instead, the PLPs may overlap in time and be multiplexed in frequency, for example.
- the L1-Pre section 10 contains signalling information relating at least to the modulation and coding scheme needed to receive the remainder of the preamble.
- the remainder of the preamble section contains information necessary to receive the data section, and in particular, the PLPs within the data section.
- the information may contain, for example, the start address of a PLP within the data section.
- the signalling information within the preamble may be referred to as OB signalling.
- the L1 Config section 12 typically carries information that is valid for each frame of the super-frame, and is typically the same for each frame of the super-frame.
- the L1-Dynamic section 14 typically varies from frame to frame, and relates to decoding the PLP within the frame. Typically, the L1-Dynamic section 14 will include a start address of the PLP, for example.
- the number of PLPs mapped onto a super-frame increases. However, each PLP may not be mapped to every frame. Carrying signalling information, and in particular L1-Dynamic information, relating to each PLP in each frame may involve a significant overhead in terms of signalling information.
- a first signalling information field, L1-Dynamic section 14, is provided for assisting in the reception of a first number of data streams.
- a second signalling information field, L1-Dynamic EXT 16 is provided for assisting in the reception of further data frames.
- the signalling information carried in the signalling information field typically includes L1-Dynamic information.
- the number of data streams for which signalling information is carried in the first signalling information field is less than or equal to a limit applicable to each of the frames in the super-frame.
- the first signalling information field is the same size for each of the frames in the super-frame.
- the size may be set at a value that is sufficiently large to give robustness due to frequency diversity.
- additional information may be transmitted beyond the capacity limit of the first signalling information field. Accordingly, the first signalling information field is maintained at a sufficient size to give robustness due to frequency diversity, while the second signalling information field may accommodate extra capacity if required.
- the second signalling information field may be less robust than the first information field, if the size of the second signalling information field is smaller than the first signalling information field.
- the first signalling information field may carry an indication as to whether a second signalling information field is to be transmitted, and may also carry an indication as to a length of the second signalling information field. This allows a receiver to inhibit reception of the second signalling information field if it is not to be transmitted, and may prepare for reception of the second signalling information field if it is to be transmitted.
- the second signalling information field may carry an indication of data streams that are idle. A receiver may inhibit reception of a frame that does not carry a data stream that is required to be received, thereby saving power consumption.
- the limit to the number of data streams for which signalling information is carried in the first signalling information field is typically determined based on statistical information relating to a number of active or idle data streams per frame for the plurality of frames, and/or based on at least a robustness of a scheme employed for the transmission of at least one of the first and second signalling information fields.
- the robustness scheme may include at least one of a modulation and coding scheme, a Multiple-Input Multiple-Output (MIMO) scheme, a Fast Fourier Transform (FFT) size, a pilot pattern, and a guard interval.
- the limit to the number of data streams for which information is carried in the first signalling information field is determined in accordance with the robustness of the transmission of the field, so that a lower limit to the size the first signalling information field may be set to a sufficient size to give adequate robustness taking into account frequency diversity and robustness of the transmission scheme.
- the first signalling information field may also be set to a size that is sufficiently large, such that it may accommodate an expected amount of signalling information related to active and passive data streams per frame, so that any overflow of signalling information beyond the expected amount may be carried in the second signalling information field.
- An indication of the limit may be carried in the preamble section of each frame, typically in the L1-Config section 12.
- the first signalling information field may have a higher robustness than the second signalling information field, due to a greater degree of frequency diversity, since the first signalling information field is typically interleaved over a larger frequency range.
- FIG. 2 illustrates a frame structure, according to an embodiment of the invention.
- the vertical axis represents frequency
- the horizontal axis represents time.
- the frame consists of a succession of Orthogonal Frequency Division Multiplexing (OFDM) symbols.
- OFDM Orthogonal Frequency Division Multiplexing
- Each OFDM symbol includes a number of subcarriers arranged at different frequencies within the frequency band of a symbol (FIZ 0 in FIG. 2, and 8 MHz in this embodiment of the present invention).
- a preamble region 2 occupies the full frequency width of the symbol.
- the remainder of the frame, being the data section, carries a number of data streams.
- the data section is segmented into a number of frequency zones, referred to as frequency interleaving zones, shown as FIZ 1 3a, FIZ 2 3b and FIZ NFIZ 3c.
- the preamble carries signalling information that is used to receive the data streams within the data section.
- Each frequency zone has the same position in a frequency domain for each of the plurality of frames in a super-frame.
- the data streams are mapped to the frequency zones, and typically, a data stream is mapped to a single frequency zone.
- PLP 1 4a and PLP 2 4b are mapped to FIZ 1 3a
- PLP 3 4c and PLP 4 4d are mapped to FIZ 2 3b
- PLP 5 6 and PLP 6 6b are mapped to FIZ NFIZ .
- a signalling information word which carries signalling relating to a position and bandwidth of at least the first frequency zone in a frequency domain to assist in the reception of the data stream, is carried in the preamble section of at least the first frame of super-frame.
- the signalling information word is typically carried in the L1-Config section of each frame.
- the preamble, carrying the signalling information word is transmitted within a wider frequency bandwidth (i.e., the full symbol bandwidth) than each of the frequency zones.
- a wider frequency bandwidth i.e., the full symbol bandwidth
- using the full symbol bandwidth to receive the preamble section may avoid the need to duplicate information in the preamble between frequency zones, which may be needed if the receiver were to use the bandwidth of the frequency zone throughout.
- a further advantage arising from reducing the transmission bandwidth, and consequently increasing a transmission time period, may be in terms of increased robustness, particularly in a mobile environment. Specifically, it may be advantageous to trade-off time and frequency diversity by reducing bandwidth and increasing a transmission time period, thereby trading a reduction in frequency diversity for a gain in time diversity.
- IB signalling may be included in the data streams of a frame. This allows the signalling information, and in particular the L1-Dynamic section, to be received within the bandwidth of a frequency zone. Accordingly, a receiver may maintain the second bandwidth for the reception of the data stream (after initially receiving the preamble in the wider bandwidth, typically in the first frame), thereby saving power consumption.
- each frequency zone is mapped to sub-carriers of a transmission symbol that are contiguous in frequency. Accordingly, the frequency band occupied by a mapped frequency zone is minimized. It would be wasteful of receiver bandwidth to leave gaps in the frequency domain.
- Data is typically interleaved in frequency, and the frequency interleaving sequence may vary from one OFDM symbol to another. This may provide greater robustness.
- pilot tones are inserted into the transmission symbol in a pattern that is independent of the segmentation of the data section of each of the plurality of frames into frequency zones. This simplifies the transmitter and receiver implementation, because the segmentation may be carried out independently from the arrangement of the physical layer.
- a lower limit may be determined based on an arrangement of pilot tones mapped to the frequency zone. In this way, a minimum robustness may be maintained for the transmission of the first frequency zone, since the robustness is dependent on the arrangement of the pilot tones. It may be required that a certain number of pilot tones fall within the part of a symbol to which the first frequency zone is mapped.
- the segmenting of the data section of each frame may be done at logic frame level, so that the implementation of a transmitter and a receiver may be simplified and the bandwidth and position of frequency zones may be allocated flexibly.
- the data stream includes components of a scalable video coding scheme
- the data section may also be segmented into a number of time zones, or Time Interleaving (TI) Frame Segments (TIFSs).
- TI Time Interleaving
- the data streams may first be mapped onto TI frames. As shown in FIG. 3, a TI frame 22 may be then be mapped to TIFSs 24a, 24b, 24c.
- a second signalling information word which carries signalling relating to the position of at least one of the TIFSs within a given frame may be included in the preamble section of the given frame, typically within the L1-Config section.
- a TI frame, or a number of TI frames were to be mapped directly onto a frequency interleaving zone, then padding may need to be included in the frequency interleaving zone if the amount of data carried by the TI frame or frames is not the same as the capacity of the frequency interleaving zone. The padding would be wasted capacity, since it may not carry data.
- the need to add padding in a frequency zone may be avoided, since the capacity of each TIFS may be arranged to fill a remaining part of a frame efficiently. For example, in FIG. 3, a TI frame 22 is mapped to both the TIFS 0 24a and the TIFS 1 24b. The TIFS 0 24a is mapped to fill remaining capacity in a frequency interleaving zone of a first frame 5a, and the TIFS 1 24b is mapped to a second frame 5b.
- the mapping of the TI frame 22 to the TIFSs 24a, 24b and to the frames 5a, 5b may be done in real time, so that flexible scheduling may be realized, in which it is not necessary to determine the number of TIFSs per frame, or over how many frames the TI frame is mapped.
- the TI frame may be mapped to start and end at any point within a frame and at any point within a super-frame, without the need to fix these points in advance.
- the second signalling information word may carry information relating to a timing of a subsequent TIFS, so that a receiver may inhibit reception of periods between TIFSs, thereby saving on power consumption, and so that the receiver may be prepared to receive subsequent TIFSs.
- FIG. 4 is a diagram illustrating a transmitter system, according to an embodiment of the present invention. Specifically, FIG. 4 shows a typical transmitter architecture, to allow segmentation into frequency zones and time interleaving frame segments.
- a data stream consists of different PLPs 400, 420, 430, and each PLP consists of consecutive TI frames.
- PLP1 400 includes TIF 1.0 405, TIF 1.1 410, ... TIF 1.N 415.
- the data of each TIF is interleaved according to the predefined time interleaver.
- a TIFS Segmentation and FIZ Mapping block 440 arranges several PLPs 400, 415, 430 into a specific FIZ 460, 465, 470, 475. Different PLPs of the FIZ are interleaved by the predefined frequency interleaver, according to the FIZ.
- a signalling generation block 450 contains the information of the logical frame structure related to PLP, TIF and FIZ.
- An OFDM generation block 480 constructs the block of OFDM cells, thereby building of the OFDM grid.
- the OFDM generation block 480 receives signalling information and data stream and maps the signalling information and data stream onto the OFDM resource.
- OFDM generation block 480 comprises apilot insertion block adds pilots into the transmitted frame depending pilot pattern, IFFT block, and Guard Insertion block.
- a Logic Frame Assembly block 490 includes a logical frame structure by assembling the different TIFSs and FIZ.
- FIG. 2 describes the logical frame structure, which is the output of the Logic Frame Assembly block.
- FIG. 5 is a diagram illustrating mapping of frequency interleaving zones to physical layer zones, according to an embodiment of the present invention.
- each frame may be divided into at least one physical layer zones PHY-Zone 1, 24, and PHY-Zone 2, 26, having different physical layer characteristics.
- the characteristics are typically varied between zones to give different levels of robustness, so that a mobile hand held receiver, for example, may receive a more robust zone, whereas a fixed receiver having a good antenna may receive a higher capacity zone.
- the physical characteristics may vary between zones in terms of FFT size, number of pilot tones, pattern of pilot tones, MIMO scheme and guard interval.
- each of the plurality of frequency zones maps to a frequency bandwidth that is the same for each physical layer zone. This allows a receiver to use the same bandwidth to receive a frequency zone within each physical layer zone of a frame.
- an interleaved frame segment may be mapped to a single physical layer zone in a given frame.
- Interleaving within a frequency interleaving zone and/or within a TIFS may be frequency-wise interleaving, so that successive parts of a data stream are mapped across parts of an OFDM symbol in frequency. The mapping may then moves on to map to parts of another orthogonal frequency division multiplexing symbol in frequency, and so on.
- the mapping may be time-wise interleaving, so that successive parts of a data stream are mapped in time across a succession of OFDM symbols, and then typically the mapping moves on to map in time to other frequency parts of the succession of OFDM symbols, and so on.
- a bandwidth of an analog filter and a sampling frequency, appropriate to the second bandwidth may be set based on the signalling information word, so that the receiver may be arranged for a minimum power consumption consistent with the bandwidth of the frequency zone to be received.
- FIG. 6 is a diagram illustrating a receiver, according to an embodiment of the present invention. Specifically, FIG. 6 illustrates a receiver suitable for receiving data frames having variable bandwidth frequency zones.
- the receiver has a signal processing unit.
- the signal processing unit generally including down-converter to convert the received signal into Intermediate Frequency 1 (IF1) 600 for baseband demodulation.
- the received signal is down-converted on a desired frequency (fo) 610 controlled by a controller 620.
- the down-converted signal is filtered through a Baseband Pass Filter (BPF) 630.
- BPF Baseband Pass Filter
- the filtered signal then has 8MHz bandwidth defined by the broadcasting system.
- the output of BPF is converted into Intermediated Frequency 2 (IF2) 640 and is filtered through a Low Pass Filter (LPF) 650.
- IF1 Intermediate Frequency 1
- LPF Low Pass Filter
- the IF2 640 and frequency of FIZ (f FIZ ) 650 are also controlled by the controller 620.
- the output signal of LPF 660 has a narrow bandwidth, e.g., 1.7 to 3.5 MHz.
- An Analog to Digitial Converter (ADC) 670 translates an analog output signal of FIZ 650 into a digital signal.
- the digital signal is demodulated by a demodulator 680.
- FIG. 7 is a diagram illustrating a receiver, according to another embodiment of the present invention.
- Tuner 700 receives broadcast service that is transmitted and converts those broadcast service into desired frequency signals.
- the Channel and FIZ Selector 720 controls the tuner 700 to down-convert a desired frequency (f0).
- the output signals of the tuner 700, I and Q components, are fed into a Remodulator 710 in order to adjust the analog receive bandwidth.
- This output of the Remodulator 710 is filtered through a Low Pass Filter(LPF) 730. From the LPF 730 output, a desired FIZ signal is selected at the BW Selector (bandwidth selector) 740 controlled by the Channel and FIZ selector 720.
- LPF Low Pass Filter
- An ADC 750 translates the output of BW Selector 740, an analog output signal of a desired FIZ allocated at fsh, into a digital signal.
- the digital signal is demodulated by a Next Generation Handheld (NGH) demodulator 760.
- NGW Next Generation Handheld
- FIG. 7 shows an alternative receiver architecture that could be used to adjust the analog receive bandwidth to be appropriate to receive the preamble and the whole first frame of a super-frame, or to receive a frequency zone for the remainder of the frames of the super-frame.
- FIG. 8 is a diagram illustrating mapping of frequency interleaving zones to physical layer zones in TIFS Mapping Mode A, according to an embodiment of the present invention.
- a TI-Frame consists of a plurality of CodeWords (CWs) and is divided into three TIFSs 24d, 24e, 24f mapped to different frequency zones 3a, 3b, 3c of successive frames 5a, 5b, 5c.
- L1 symbol of signalling the information of the frame structure is located in the beginning of frame.
- FIG. 9 is a diagram illustrating mapping of frequency interleaving zones to physical layer zones in TIFS Mapping Mode B, according to an embodiment of the present invention.
- a TI-Frame consists of a plurality of CWs and is divided into three TIFSs, 24d, 24e, and 24f mapped to different frequency zones,(3a, 3b, and 3c), of a given frame 5d.
- TIFS Mapping Mode A implies that the TI-Frame is transmitted through successive frames.
- TIFS Mapping Mode B infers that the TI-Frame is transmitted on a frame.
- FIGS. 10 to 18 provide examples of signalling words that may be used in embodiments of the invention.
- FIG. 10 is a table showing the L1-config signalling field, according to an embodiment of the present invention.
- the total number of PLPs used during the super-frame is indicated by NUM_PLP.
- the limit, applicable to each of the frames in the super-frame, to the number of PLP for which signalling information is carried in the first signalling information field is carried by NUM_PLP_IN_L1DYN, 30.
- FIG. 11 is a table showing the L1-dynamic signalling field, according to an embodiment of the present invention. Specifically, FIG, 11 gives an example of an L1 dynamic word.
- Reference numeral 32 relates to information regarding the PLPs for which information is carried within the L1 dynamic, rather than L1 dynamic-EXT word.. Most of the definition of the signalling field is described in accordance with DVB-T2 standards. Signalling fields 32 and 34 are described in greater detail below.
- NUM_PLP_IN_L1DYN The number of data streams signalled in the first signalling information in the current frame.
- PLP_ID An 8-bit field indicating the ID of the PLP carrying the data stream.
- PLP_START A 22-bit field indicating the start (location) of that PLP in the frame.
- PLP_NUM_BLOCKS A 10-bit field indicating the number of FEC blocks encapsulated in that PLP.
- Reference numeral 34 refers to NUM_PLP_ext, which may indicate the number of PLPs for which signalling information is carried in the L1 dynamic_EXT word. Reference numeral 34 also refers to NUM_IDLE_PLP, which indicates a number of idle PLPs within the frame.
- NUM_PLP_ext An 8-bit field indicating the number of active PLPs in the second signalling part (in case the number of PLPs in the frame exceeds the limit).
- NUM_IDLE_PLP An 8-bit field indicates the number of idle PLPs in the current frame.
- FIG. 12 is a table showing the L1-dynamic-Ext signalling field, according to an embodiment of the present invention. Specifically, FIG. 12 provides an example of an L1 dynamic_EXT word.
- Reference numeral 36 indicates components that carry signalling information relating to PLPs for which the information was not carried in the L1-dynamic word, and signalling information relating to idle PLPs. Signalling fields 36 are described in greater detail below.
- PLP_ID, PLP_START, PLP_NUM_BLOCKS Same as in the signalling definition in FIG. 11, but for the PLPs in the extended part.
- PLP_DELTA An 8-bit field indicates the relative timing to when the idle PLP will become active again.
- FIG. 13 is a table showing the L1-config signalling field, according to an embodiment of the present invention. Specifically, FIG. 13 illustrates a further example of a L1-config (configuration) signalling word, including signalling relating to TIFSs. Signalling fields 38, 40 and 42 are described in greater detail below.
- NUM_FIZ A 3-bit field indicating the number of FIZs.
- NUM_TIFS_a An 8-bit field indicating the number of TIFSs in the frame.
- PLP_TIF_NUM_BLOCKS A 10-bit field indicating the number of FEC blocks used in one time interleaving frame for a given PLP.
- FIZ_LENGTH A 10-bit field indicating the size of one FIZ in OFDM cells.
- FIZ_MAPPING_TYPE A 1-bit field indicating the mapping type of FIZ. This field is set to ‘1” if a TIFS Mapping Mode A is applied, and is set to “0” if a TIFS Mapping Mode B is applied
- FIG. 14 is a table showing the L1-dynamic signalling field, according to another embodiment of the present invention. Specifically, FIG. 14 illustrates a further example of a L1-dynamic signalling word, including signalling relating to TIFSs. Signalling fields 44 and 46 are described in detail below.
- PLP_ID An 8-bit field indicating the ID of the PLP carrying the data stream.
- PLP_TIFS_START A 21-bit field indicating the start position in the given TIFS.
- PLP_TIFS_LENGTH A 15-bit field indicating the size of the PLP in the given TIFS.
- PLP_TIFS_TYPE A 2-bit field indicating the type of the PLP in the given TIFS (PLP Type 1 or Type 2).
- PLP_TIFS_DRAME_IDX A 1-bit field indicating the frame index of the PLP mapped onto the given TIFS.
- PLP_TUFS_DELTA A 4-bit field indicating the relative timing from the current TIFS to the next TIFS which will carry the given PLP (PLP ID).
- FIZ_ID A 1-bit field indicating the ID of the FIZ carrying the TIFS.
- NUM_PLP_ext An 8-bit field indicating the number of active PLPs in the second signalling part (in case the number of PLPs in the frame exceeds the limit).
- NUM_IDLE_PLP An 8-bit field indicating the number of idle PLPs in the current frame.
- FIG. 15 is a table showing a further example of the L1-dynamic-Ext signalling field, according to another embodiment of the present invention. Specifically, FIG. 15 illustrates a further example of a L1-config-ext signalling word, including signalling relating to TIFSs. Signalling fields 48 are similar to the signalling fields in FIG. 14, but are used for the extended TIFS. IDLE_PLP, PLP_ID and PLP_DELTA are similar to the definitions provided with respect to FIG. 12.
- FIG. 16 is a table showing IB signalling, according to an embodiment of the present invention. Specifically, FIG. 16 illustrates an example of an IB signalling word, including signalling relating to TIFSs Signalling fields 50 are similar to those provided with respect to FIG. 14, but since it is IB signalling, they are embedded to the given/desired PLP.
- FIG. 17 is a table showing the L1-pre-signalling field, according to an embodiment of the present invention. Specifically, FIG. 17 illustrates an example of a L1-pre signalling word, including signalling relating to physical layer zones. Signalling fields 52 are defined as set forth below.
- PZ0_PILOT_PATTERN A 4-bit field indicating the pilot pattern in the Physical Zone 0 (First physical zone).
- PZ0_GUARD_INTERVAL A 3-bit field indicating the guard interval used in the Physical Zone 0 (first Physical Zone).
- NUM_PZ A 3-bit field indicating the number of the Physical Zones.
- FIG. 18 is a table showing the L1-config signalling field, according to another embodiment of the present invention.
- FIG. 18 illustrates a yet further example of a L1-config signalling word, including signalling relating to physical layer zones.
- Signalling fields 54, 56, 58 and 60 are defined as set forth below.
- Reference numeral 54 is same as reference numeral 40
- FIZ_LENGTH A 10-bit field indicating the number of cells (capacity of the frequency interleaving zone).
- FIZ_MAPPING_TYPE A 1-bit field indicating either frequency-wise or time-wise mapping is used (mode A and B).
- PZ_FFT_SIZE A 4-bit field indicating the FFT size of the Physical Zone.
- PZ_PILOT_PATTERN A 1-bit field indicating the pilot pattern used in the given physical zone.
- PZ_GUARD_INTERVAL A 1-bit field indicating the OFDM guard interval used in the given physical zone.
- Reference numeral 60 is same as reference numeral 38.
Abstract
L'invention concerne des procédés et des appareils permettant de transmettre des données ayant un flux de données dans un système de diffusion sans fil. Le flux de données est mis en correspondance avec une super-trame contenant des trames. Chaque trame contient une section de préambule et une section de données. La section de données transporte le flux de données et la section de préambule transporte des informations de signalisation. La section de données de chaque trame est segmentée en des zones de fréquence. Au moins une partie du flux de données est mise en correspondance avec une première zone de fréquence. Un mot d'information de signalisation est généré, celui-ci transportant une signalisation concernant une position et une largeur de bande d'au moins la première zone de fréquence. Le mot d'information de signalisation est contenu dans la section de préambule d'une trame donnée. La section de préambule est transmise dans une première bande de fréquences et la première zone de fréquence est transmise dans une seconde bande de fréquences. La première bande de fréquences est plus large que la seconde bande de fréquences.
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
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GB1021113.4A GB2484154A (en) | 2010-09-29 | 2010-12-13 | Frame structure for a digital broadcasting system |
PCT/KR2011/009530 WO2012081868A1 (fr) | 2010-12-13 | 2011-12-12 | Procédé et appareil de transmission des données ayant un flux de données dans un système de diffusion sans fil |
Publications (2)
Publication Number | Publication Date |
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EP2652943A1 true EP2652943A1 (fr) | 2013-10-23 |
EP2652943A4 EP2652943A4 (fr) | 2014-08-27 |
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Application Number | Title | Priority Date | Filing Date |
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EP11849822.9A Withdrawn EP2652943A4 (fr) | 2010-12-13 | 2011-12-12 | Procédé et appareil de transmission des données ayant un flux de données dans un système de diffusion sans fil |
Country Status (3)
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EP (1) | EP2652943A4 (fr) |
KR (1) | KR20120068705A (fr) |
WO (1) | WO2012081868A1 (fr) |
Citations (6)
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EP2131521A1 (fr) * | 2008-06-04 | 2009-12-09 | Sony Corporation | Réception d'un signal digital |
US20090304023A1 (en) * | 2008-06-04 | 2009-12-10 | Sony Corporation | New frame and training pattern structure for multi-carrier systems |
US20100135316A1 (en) * | 2008-10-09 | 2010-06-03 | Sony Corporation | Frame and data pattern structure for multi-carrier systems |
EP2207282A2 (fr) * | 2009-01-08 | 2010-07-14 | LG Electronics | Procédé de transmission et de réception d'un signal de télédiffusion et appareil de transmission et de réception d'un signal de télédiffusion |
US20100226426A1 (en) * | 2009-03-05 | 2010-09-09 | Nokia Corporation | Transmission of Physical Layer Signaling in a Broadcast System |
US20100262708A1 (en) * | 2009-04-08 | 2010-10-14 | Nokia Corporation | Method and apparatus for delivery of scalable media data |
Family Cites Families (1)
Publication number | Priority date | Publication date | Assignee | Title |
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KR101349990B1 (ko) * | 2007-10-31 | 2014-01-15 | 삼성전자주식회사 | 무선 디지털 방송 시스템에서 방송 데이터를 송수신하는방법 및 장치 |
-
2011
- 2011-12-12 KR KR1020110132675A patent/KR20120068705A/ko not_active Application Discontinuation
- 2011-12-12 EP EP11849822.9A patent/EP2652943A4/fr not_active Withdrawn
- 2011-12-12 WO PCT/KR2011/009530 patent/WO2012081868A1/fr active Application Filing
Patent Citations (6)
Publication number | Priority date | Publication date | Assignee | Title |
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EP2131521A1 (fr) * | 2008-06-04 | 2009-12-09 | Sony Corporation | Réception d'un signal digital |
US20090304023A1 (en) * | 2008-06-04 | 2009-12-10 | Sony Corporation | New frame and training pattern structure for multi-carrier systems |
US20100135316A1 (en) * | 2008-10-09 | 2010-06-03 | Sony Corporation | Frame and data pattern structure for multi-carrier systems |
EP2207282A2 (fr) * | 2009-01-08 | 2010-07-14 | LG Electronics | Procédé de transmission et de réception d'un signal de télédiffusion et appareil de transmission et de réception d'un signal de télédiffusion |
US20100226426A1 (en) * | 2009-03-05 | 2010-09-09 | Nokia Corporation | Transmission of Physical Layer Signaling in a Broadcast System |
US20100262708A1 (en) * | 2009-04-08 | 2010-10-14 | Nokia Corporation | Method and apparatus for delivery of scalable media data |
Non-Patent Citations (1)
Title |
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Also Published As
Publication number | Publication date |
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WO2012081868A1 (fr) | 2012-06-21 |
KR20120068705A (ko) | 2012-06-27 |
EP2652943A4 (fr) | 2014-08-27 |
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