JP6504406B2 - データ処理装置、及び、データ処理方法 - Google Patents
データ処理装置、及び、データ処理方法 Download PDFInfo
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- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L49/00—Packet switching elements
- H04L49/55—Prevention, detection or correction of errors
- H04L49/552—Prevention, detection or correction of errors by ensuring the integrity of packets received through redundant connections
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L1/00—Arrangements for detecting or preventing errors in the information received
- H04L1/004—Arrangements for detecting or preventing errors in the information received by using forward error control
- H04L1/0041—Arrangements at the transmitter end
- H04L1/0042—Encoding specially adapted to other signal generation operation, e.g. in order to reduce transmit distortions, jitter, or to improve signal shape
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L1/00—Arrangements for detecting or preventing errors in the information received
- H04L1/004—Arrangements for detecting or preventing errors in the information received by using forward error control
- H04L1/0056—Systems characterized by the type of code used
- H04L1/0057—Block codes
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N19/00—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals
- H04N19/65—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals using error resilience
- H04N19/66—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals using error resilience involving data partitioning, i.e. separation of data into packets or partitions according to importance
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- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N19/00—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals
- H04N19/65—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals using error resilience
- H04N19/68—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals using error resilience involving the insertion of resynchronisation markers into the bitstream
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- 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
- H04N21/236—Assembling of a multiplex stream, e.g. transport stream, by combining a video stream with other content or additional data, e.g. inserting a URL [Uniform Resource Locator] into a video stream, multiplexing software data into a video stream; Remultiplexing of multiplex streams; Insertion of stuffing bits into the multiplex stream, e.g. to obtain a constant bit-rate; Assembling of a packetised elementary stream
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- 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
- H04N21/2381—Adapting the multiplex stream to a specific network, e.g. an Internet Protocol [IP] network
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- H—ELECTRICITY
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- H04N21/00—Selective content distribution, e.g. interactive television or video on demand [VOD]
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- H04W4/00—Services specially adapted for wireless communication networks; Facilities therefor
- H04W4/06—Selective distribution of broadcast services, e.g. multimedia broadcast multicast service [MBMS]; Services to user groups; One-way selective calling services
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L1/00—Arrangements for detecting or preventing errors in the information received
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
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- H04L2001/0092—Error control systems characterised by the topology of the transmission link
- H04L2001/0096—Channel splitting in point-to-point links
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Description
(see Part I, clause 4.3)
Table 1 associates the S2X system elements to the applications areas. All elements in Table 1 are optional in transmitting and receiving equipment complying with the S2 specification. At least "Normative" subsystems and functionalities shall be implemented in the transmitting and receiving equipment to comply with the S2X specification for a specific application area.
Within the present Annex, a number of configurations and mechanisms are defined as "Optional". Configurations and mechanisms explicitly indicated as "optional" within the present Annex, for a given application area, need not be implemented in the equipment to comply with the S2X specification. Nevertheless, when an "optional" mode or mechanism is implemented, it shall comply with the specification as given in the present document.
(see Part I, clause 5.1.6)
First byte (MATYPE-1):
・TS/GS field (2 bits): Transport Stream Input, Generic Stream Input (packetized or continuous) or GSEHEM.
・SIS/MIS field (1 bit): Single Input Stream or Multiple Input Stream.
・CCM/ACM field (1 bit): Constant Coding and Modulation or Adaptive Coding and Modulation (VCM is signalled as ACM).
・ISSYI (1 bit), (Input Stream Synchronization Indicator): If ISSYI = 1 = active, the ISSY field (see annex D) is inserted after UPs or in the baseband header in GSE-HEM
・For TS input mode:
○NPD (1 bit): Null-packet deletion active/not active.
・For GSE/Generic Continuous/Generic Packetized modes:
○GSE-Lite (1 bit): GSE stream is GSE-Lite compliant/non-compliant
・RO (2 bits): Transmission Roll-off factor (α). Three additional roll-off factors shall be available, 0,15; 0,10 and 0,05. Signalling shall be according to the following rule (Table 1[sic: should be revised as Table 2]):
○If RO bits are signalled consistently from BBHEADER to BBHEADER as either 00, 01, 10 the backward compatible definition (High roll-off range) applies:
00 = 0,35
01 = 0,25
10 = 0,20
○If RO bits are signalled from BBHEADER to BBHEADER in an alternating way with 11 then their interpretation shall be Low roll-off range:
00 = 0,15
01 = 0,10
10 = 0,05
It shall be ensured that the in a Multiple Input Stream configuration (SIS/MIS field = 0) alternation is unambiguously evident over all Input Streams (for every ISI) and MODCOD combinations, such that any receiver will receive regular alternation. Any receiver, once locked will switch to low roll-off range on first detection of '11'.
GSE variable-length or constant length UPs may be transmitted in GSE-HEM. In GSE-HEM, slicing of GSE packets is performed and SYNCD shall always be computed. The receiver may derive the length of the UPs from the packet header, therefore UPL transmission in BBHEADER is not performed. UPs shall not be sliced when there is a BBFRAME from a different stream following, splitting is only possible with the immediately following BBFRAME. The optional ISSY field is transmitted in the BBHEADER.
The Mode Adaptation unit shall perform the following sequence of operations (see figure 1):
・Optional input stream synchronization (see Part I, Annex D.2) relevant to the first transmitted UP which starts in the data field; ISSY field inserted in the UPL and SYNC fields of the BBHEADER.
・Null-packet Deletion and CRC-8 at UP level shall not be computed nor inserted.
・SYNCD computation (pointing at the first bit of the first transmitted UP which starts in the Data Field) and storage in BBHEADER. The transmitted UP corresponds exactly to the original UP itself. Hence SYNCD points to the first bit of the original UP.
・UPL not computed nor transmitted.
・GSE-Lite compliance of the stream shall be signalled in the 6th bit of the MATYPE-1 field. GSE-Lite=1 means a GSE-Lite compliant signal is transmitted. GSE-Lite=0 means that the transmitted GSE stream may not meet the definition of a GSE-Lite signal.
Generic Stream Encapsulation (GSE) [2] is an extremely flexible method to transmit any kind of data, including popular formats such as IP packets or TS packets where the data can be of fixed or variable length. GSE can be used for bonded channels to support a higher data rate than can be carried in a single RF channel. A maximum of L channels (L<=3) is supported. The number of bonded transponders and associated information is signalled in the GSE-LLC tables according to [2]. These GSE-LLC tables shall be transmitted in parallel over each of the bonded transponders. To ensure maximum efficiency in S2X, it is recommended to use GSE-HEM (see clause 5.1.7). The following describes the use of channel boding in GSE-HEM.
Channel bonding for GSE transmission is similar to the TS method of bonding described in clause 5.1.8.2, using the ISCR timing data in the ISSY field to allow the receiver to align packets from different RF channels (see Part I, Annex D for ISSY details). However ISSY is not added per UP, but per baseband frame (BBFRAME). ISSY shall always be used for bonded GSE channels. In the ISSY field, ISCR shall be transmitted every BBFRAME. BUFS and BUFSTAT shall not be transmitted.
At the modulator, input UPs (GSE packets) are continuously added to the Data Field of a single BBFRAME until it is complete. Appropriate ISSY information is added to the baseband frame header (BBHEADER) of each BBFRAME. ISSY information refers to the first transmitted UP which starts in the Data Field. UPs shall be transparently sliced between BBFRAMEs on different RF channels as necessary it is not required to slice UPs on BBFRAMEs using the same RF channel. The order of input UPs must be maintained in the bonding process. Each BBFRAME is constructed with a length that is derived according to the modulation and coding parameters for that RF channel. Each RF channel may have different modulation and coding parameters. In order to reduce buffering requirements, BBFRAMEs shall be created for each RF channel according to the ratio of the bitrate of each RF channel. For example if the bitrates of two bonded RF channels are equal, BBFRAMEs for each RF channel shall occur in alternating fashion.
An example of the transmission of bonded GSE channels is shown in Figure 3 below.
At the receiver side, each GSE bonded RF channel is demodulated according to the modulation and coding parameters for that RF channel. An example diagram is shown in Figure 4.
The output from each demodulator is then combined at the Merger using the ISSY information contained in the BBHEADER of each BBFRAME. The ISSY information provides the timing information to recover the order of the BBRAMES from different demodulators. Since ISSY information applies to each BBFRAME, and the packet order of UPs within each BBFRAME is maintained, the overall order of UPs is maintained at the Merger output. Split UPs are reconstructed in the Merger.
In comparison to the TS method, the output bitrate of each demodulator is no greater than the bitrate of the channel, which can significantly reduce the processing burden at the Merger. Furthermore, since ISSY information need only be processed per BBFRAME, the merging operation processing burden is also reduced. A maximum tolerance of one BBFRAME of delay shall be allowed between the different receivers.
After merging, additional processing such as filtering of GSE packets, output of IP or TS packets rather than GSE packets, and so on may be undertaken at the receiver as necessary.
For Generic Packetized streams, ISSY must be added on a per packet basis the same as for TS channel bonding. CRC-8 shall be added per packet, as described in Part I clause 5.1.5. SYNCD shall be computed and point to the first bit of the CRC-8 of the previous UP. Packets shall only be split on the same RF channel.
For Generic Continuous streams using GSE, ISSY must be added on a per packet basis the same as for TS channel bonding. CRC-8 computation shall not be performed. SYNCD shall be computed and point to the first transmitted UP in the Data Field. The UPL field may contain proprietary signalling, including information about channel bonding, otherwise the UPL field shall be set to 0. GSE Packets shall only be split on the same RF channel.
複数のパケットで構成される入力ストリームを分割し、FEC(Forward Error Correction)の対象となるBBF(Base Band Frame)のデータフィールドに前記入力ストリームの前記パケットが連続する順番で配置されたBBFを最小単位とする複数チャネルの分割ストリームを生成する分割部を備える
データ処理装置。
<2>
時刻を表す時刻情報を生成する生成部をさらに備え、
前記BBFは、前記BBFに配置される前記パケットに付加される前記時刻情報を含む
<1>に記載のデータ処理装置。
<3>
前記BBFのBBヘッダは、前記BBFに配置される先頭のパケットの前記時刻情報を含む
<2>に記載のデータ処理装置。
<4>
前記時刻情報は、DVB-S2に規定するISSY(Input Stream Synchroniser)であり、
DVB-S2に規定する前記BBFのBBヘッダのUPLフィールド及びSYNCフィールドを、前記ISSYを配置するフィールドとして用いる
<3>に記載のデータ処理装置。
<5>
前記分割部は、
前記パケットごとに、前記時刻情報を付加し、
前記BBFに配置される前記パケットの前記時刻情報を削除するとともに、前記BBFに配置される先頭のパケットの前記時刻情報を、前記BBFの前記BBヘッダに含める
<4>に記載のデータ処理装置。
<6>
前記分割部は、
前記入力ストリームを、前記BBFに配置されるBBF用データの単位で、前記分割ストリームに分割し、
前記分割ストリームのBBF用データが配置された前記BBFを生成する
<1>ないし<5>のいずれかに記載のデータ処理装置。
<7>
前記分割部は、
前記入力ストリームから、前記BBFを生成し、
前記入力ストリームを、前記BBFの単位で、前記分割ストリームに分割する
<1>ないし<5>のいずれかに記載のデータ処理装置。
<8>
前記入力ストリームは、TS(Transport Stream),GCS(Generic Continuous Stream),GSE(Generic Stream Encapsulation)パケットのストリーム、GSE-Liteパケットのストリーム、又は、IP(Internet Protocol)パケットのストリームである
<1>ないし<7>のいずれかに記載のデータ処理装置。
<9>
複数のパケットで構成される入力ストリームを分割し、FEC(Forward Error Correction)の対象となるBBF(Base Band Frame)のデータフィールドに前記入力ストリームの前記パケットが連続する順番で配置されたBBFを最小単位とする複数チャネルの分割ストリームを生成する
ステップを含むデータ処理方法。
<10>
複数のパケットで構成される入力ストリームを分割し、FEC(Forward Error Correction)の対象となるBBF(Base Band Frame)のデータフィールドに前記入力ストリームの前記パケットが連続する順番で配置されたBBFを最小単位とする複数チャネルの分割ストリームを生成する送信装置から送信されてくる前記複数チャネルの分割ストリームから、前記入力ストリームを再構成する再構成部を備える
データ処理装置。
<11>
前記送信装置は、時刻を表す時刻情報を生成し、
前記BBFは、前記BBFに配置される前記パケットに付加される前記時刻情報を含み、
前記再構成部は、前記時刻情報に基づいて、前記複数チャネルの分割ストリームから、前記入力ストリームを再構成する
<10>に記載のデータ処理装置。
<12>
前記BBFのBBヘッダは、前記BBFに配置される先頭のパケットの前記時刻情報を含み、
前記再構成部は、前記BBヘッダに含まれる前記時刻情報に基づいて、前記複数チャネルの分割ストリームから、前記入力ストリームを再構成する
<11>に記載のデータ処理装置。
<13>
前記時刻情報は、DVB-S2に規定するISSY(Input Stream Synchroniser)であり、
DVB-S2に規定する前記BBFのBBヘッダのUPLフィールド及びSYNCフィールドが、前記ISSYを配置するフィールドとして用いられる
<12>に記載のデータ処理装置。
<14>
前記入力ストリームは、TS(Transport Stream),GCS(Generic Continuous Stream),GSE(Generic Stream Encapsulation)パケットのストリーム、GSE-Liteパケットのストリーム、又は、IP(Internet Protocol)パケットのストリームである
<10>ないし<13>のいずれかに記載のデータ処理装置。
<15>
複数のパケットで構成される入力ストリームを分割し、FEC(Forward Error Correction)の対象となるBBF(Base Band Frame)のデータフィールドに前記入力ストリームの前記パケットが連続する順番で配置されたBBFを最小単位とする複数チャネルの分割ストリームを生成する送信装置から送信されてくる前記複数チャネルの分割ストリームから、前記入力ストリームを再構成する
ステップを含むデータ処理方法。
Claims (11)
- 時刻を表す時刻情報を生成する生成部と、
複数のパケットで構成される入力ストリームを分割して、チャネルごとの分割ストリームを生成する分割部と
を備え、
前記チャネルは、複数存在し、
前記分割ストリームは、FEC(Forward Error Correction)の対象となるBBF(Base Band Frame)のデータフィールドに前記入力ストリームの前記パケットが連続する順番で配置されたBBFを最小単位として構成され、
前記分割ストリームを構成する前記BBFのBBヘッダは、前記BBFに配置される先頭のパケットの前記時刻情報を含む
データ処理装置。 - 前記時刻情報は、DVB-S2に規定するISSY(Input Stream Synchroniser)であり、
DVB-S2に規定する前記BBFのBBヘッダのUPLフィールド及びSYNCフィールドを、前記ISSYを配置するフィールドとして用いる
請求項1に記載のデータ処理装置。 - 前記分割部は、
前記パケットごとに、前記時刻情報を付加し、
前記BBFに配置される前記パケットの前記時刻情報を削除するとともに、前記BBFに配置される先頭のパケットの前記時刻情報を、前記BBFの前記BBヘッダに含める
請求項2に記載のデータ処理装置。 - 前記分割部は、
前記入力ストリームを、前記BBFに配置されるBBF用データの単位で、前記分割ストリームに分割し、
前記分割ストリームのBBF用データが配置された前記BBFを生成する
請求項1ないし3のいずれかに記載のデータ処理装置。 - 前記分割部は、
前記入力ストリームから、前記BBFを生成し、
前記入力ストリームを、前記BBFの単位で、前記分割ストリームに分割する
請求項1ないし3のいずれかに記載のデータ処理装置。 - 前記入力ストリームは、TS(Transport Stream),GCS(Generic Continuous Stream),GSE(Generic Stream Encapsulation)パケットのストリーム、GSE-Liteパケットのストリーム、又は、IP(Internet Protocol)パケットのストリームである
請求項1ないし5のいずれかに記載のデータ処理装置。 - データ処理装置が、
時刻を表す時刻情報を生成し、
複数のパケットで構成される入力ストリームを分割して、チャネルごとの分割ストリームを生成する
ステップを含み、
前記チャネルは、複数存在し、
前記分割ストリームは、FEC(Forward Error Correction)の対象となるBBF(Base Band Frame)のデータフィールドに前記入力ストリームの前記パケットが連続する順番で配置されたBBFを最小単位として構成され、
前記分割ストリームを構成する前記BBFのBBヘッダは、前記BBFに配置される先頭のパケットの前記時刻情報を含む
データ処理方法。 - 時刻を表す時刻情報を生成する生成部と、
複数のパケットで構成される入力ストリームを分割して、チャネルごとの分割ストリームを生成する分割部と
を備え、
前記チャネルは、複数存在し、
前記分割ストリームは、FEC(Forward Error Correction)の対象となるBBF(Base Band Frame)のデータフィールドに前記入力ストリームの前記パケットが連続する順番で配置されたBBFを最小単位として構成され、
前記分割ストリームを構成する前記BBFのBBヘッダは、前記BBFに配置される先頭のパケットの前記時刻情報を含む
送信装置から送信されてくる前記チャネルごとの前記分割ストリームから、前記BBヘッダに含まれる前記時刻情報に基づいて、前記入力ストリームを再構成する再構成部を備える
データ処理装置。 - 前記時刻情報は、DVB-S2に規定するISSY(Input Stream Synchroniser)であり、
DVB-S2に規定する前記BBFのBBヘッダのUPLフィールド及びSYNCフィールドが、前記ISSYを配置するフィールドとして用いられる
請求項8に記載のデータ処理装置。 - 前記入力ストリームは、TS(Transport Stream),GCS(Generic Continuous Stream),GSE(Generic Stream Encapsulation)パケットのストリーム、GSE-Liteパケットのストリーム、又は、IP(Internet Protocol)パケットのストリームである
請求項8又は9に記載のデータ処理装置。 - 時刻を表す時刻情報を生成する生成部と、
複数のパケットで構成される入力ストリームを分割して、チャネルごとの分割ストリームを生成する分割部と
を備え、
前記チャネルは、複数存在し、
前記分割ストリームは、FEC(Forward Error Correction)の対象となるBBF(Base Band Frame)のデータフィールドに前記入力ストリームの前記パケットが連続する順番で配置されたBBFを最小単位として構成され、
前記分割ストリームを構成する前記BBFのBBヘッダは、前記BBFに配置される先頭のパケットの前記時刻情報を含む
送信装置から送信されてくる前記チャネルごとの前記分割ストリームを受信するデータ処理装置が、
受信された前記チャネルごとの前記分割ストリームから、前記BBヘッダに含まれる前記時刻情報に基づいて、前記入力ストリームを再構成する
ステップを含むデータ処理方法。
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