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55830bb2142e344429b649b761595809 | 102 778-6 | 6.3 Detailed representation of AdES signature verification | The user should be able to display all the elements of the signer and all CA Certificates used in the validation path if required. The signature details shall contain the following information if available in the verification result: a) The algorithm validity as in section 3.5.2 of [3]. b) The certificate path validity... |
2a974b8006a5344345d71fc87d1c49a4 | 102 773 | 1 Scope | The present document defines the interface to a modulator for a second generation terrestrial television system (DVB-T2). The present document also describes a mechanism to allow the operation of over the air regenerative repeaters in SFN or non-SFN networks. |
2a974b8006a5344345d71fc87d1c49a4 | 102 773 | 2 References | References are either specific (identified by date of publication and/or edition number or version number) or non-specific. For specific references, only the cited version applies. For non-specific references, the latest version of the reference document (including any amendments) applies. Referenced documents which ar... |
2a974b8006a5344345d71fc87d1c49a4 | 102 773 | 2.1 Normative references | The following referenced documents are necessary for the application of the present document. [1] ETSI EN 302 755: "Digital Video Broadcasting (DVB); Frame structure channel coding and modulation for a second generation digital terrestrial television broadcasting system (DVB-T2)". [2] ETSI TS 102 606: "Digital Video Br... |
2a974b8006a5344345d71fc87d1c49a4 | 102 773 | 2.2 Informative references | The following referenced documents are not necessary for the application of the present document but they assist the user with regard to a particular subject area. [i.1] ETSI TS 102 831: "Digital Video Broadcasting (DVB); Implementation guidelines for a second generation digital terrestrial television broadcasting syst... |
2a974b8006a5344345d71fc87d1c49a4 | 102 773 | 3 Definitions, symbols and abbreviations | |
2a974b8006a5344345d71fc87d1c49a4 | 102 773 | 3.1 Definitions | For the purposes of the present document, the terms and definitions given in [i.1] and the following apply: auxiliary stream: sequence of cells carrying data of as yet undefined modulation and coding, which may be used for future extensions or as required by broadcasters or network operators common PLP: PLP having one ... |
2a974b8006a5344345d71fc87d1c49a4 | 102 773 | 3.2 Symbols | For the purposes of the present document, the symbols given in [i.1] and the following apply: Nx The value N is expressed in radix x NOTE: The radix of x is decimal, thus 2A16 is the hexadecimal representation of the decimal number 42. NT2 Number of T2-frames in a super-frame IFEF The value of FEF_INTERVAL from the L1-... |
2a974b8006a5344345d71fc87d1c49a4 | 102 773 | 3.3 Abbreviations | For the purposes of the present document, the abbreviations given in [i.1] and the following apply: ACE Active Constellation Extension AL Application Layer AL-FEC Application Layer Forward Error Correction ASI Asynchronous Serial Interface BB BaseBand bflbf bit-field, left bit first bflbfzpb bit-field, left bit first, ... |
2a974b8006a5344345d71fc87d1c49a4 | 102 773 | 4 General description | |
2a974b8006a5344345d71fc87d1c49a4 | 102 773 | 4.1 System overview | The DVB-T2 specification [1] enables service-specific robustness to be achieved through the use of Physical Layer Pipes (PLPs). The allocation of data to each PLP is not however prescriptive and the T2 specification merely states that certain constraints must be met. ETSI ETSI TS 102 773 V1.3.1 (2012-01) 11 To enable S... |
2a974b8006a5344345d71fc87d1c49a4 | 102 773 | 4.2 System architecture | The block diagram of a typical DVB-T2 end-to-end chain for Transport Stream input is shown in figure 1. The T2-MI is shown as "Interface B" at the output of the T2-Gateway. Figure 1: Block diagram of a typical DVB-T2 chain |
2a974b8006a5344345d71fc87d1c49a4 | 102 773 | 4.3 Protocol stack | Figure 2 shows the T2-MI protocol stack. ETSI ETSI TS 102 773 V1.3.1 (2012-01) 12 Figure 2: The T2-MI protocol stack The DVB-T2 Modulator Interface (T2-MI) carries the DVB-T2 system inputs, MPEG-2 TS and/or Generic Streams, encapsulated within DVB-T2 Baseband Frames [1]. In addition the T2-MI also carries other T2 data... |
2a974b8006a5344345d71fc87d1c49a4 | 102 773 | 5 T2-MI packets | Several different types of T2-related data may be sent over the T2-MI through the use of T2-MI packets. All fields are uimsbf unless otherwise stated. |
2a974b8006a5344345d71fc87d1c49a4 | 102 773 | 5.1 T2-MI packet definition | The T2-MI packet format is shown in figure 3. ETSI ETSI TS 102 773 V1.3.1 (2012-01) 13 Figure 3: T2-MI packet format Each T2-MI packet is composed of a 6 byte header, followed by a variable-length payload part plus padding, when required, and a 32-bit CRC tail for error detection. The T2-MI packet consists of the follo... |
2a974b8006a5344345d71fc87d1c49a4 | 102 773 | 5.2 T2-MI payload definitions | |
2a974b8006a5344345d71fc87d1c49a4 | 102 773 | 5.2.1 Baseband Frame | T2-MI packets with a packet_type of 0016 shall carry Baseband Frames, in accordance with [1], clause 5.1.7. The T2-MI packet payload is shown in figure 4. frame_idx 8 bits plp_id 8 bits Kbch bits 1 bit rfu BBFRAME intl_frame _start 7 bits Figure 4: Baseband Frame payload The fields are defined as follows: frame_idx (8 ... |
2a974b8006a5344345d71fc87d1c49a4 | 102 773 | 5.2.2 Auxiliary stream I/Q data | T2-MI packets with a packet_type of 0116 shall carry auxiliary stream data, in accordance with [1], clause 8.3.7. The T2-MI packet payload is shown in figure 5. frame_idx 8 bits aux_id 4 bits 12 bits rfu aux_stream_data variable Figure 5: Auxiliary stream payload frame_idx (8 bits) indicates the FRAME_IDX, as defined i... |
2a974b8006a5344345d71fc87d1c49a4 | 102 773 | 5.2.3 Arbitrary cell insertion | T2-MI packets with a packet_type of 0216 shall carry arbitrary cell data that the modulator shall insert into the T2 frame starting at the specified cell address and continuing until the end of the complex cell values in the aribitrary_cell_data field. The T2-MI packet payload is shown in figure 6. frame_idx 8 bits rfu... |
2a974b8006a5344345d71fc87d1c49a4 | 102 773 | 5.2.4 L1-current T2-MI packets | T2-MI packets with a packet_type of 1016 shall contain L1 pre- and post-signalling data to be inserted (as described in clause 5.3) into the P2 symbols of the T2-frame indicated by frame_idx and describing the same ("current") T2-frame. The T2-MI packet payload is shown in figure 7. frame_idx 8 bits L1-current_data rfu... |
2a974b8006a5344345d71fc87d1c49a4 | 102 773 | 5.2.5 L1-future | T2-MI packets with a packet_type of 1116 shall contain L1 post-signalling data to be inserted (according to clause 7.2.3 of [1]) into the P2 symbols of the T2-frame indicated by frame_idx, and/or in-band signalling data to be inserted into the first BB-Frame of the Interleaving Frame beginning in that T2-frame. The sig... |
2a974b8006a5344345d71fc87d1c49a4 | 102 773 | 5.2.6 P2 bias balancing cells | T2-MI packets with a packet_type of 1216 shall contain information regarding bias balancing cells to be inserted by the modulator (according to clause 8.3.6.3.1 of [1]) into the P2 symbols of the T2-frame indicated by frame_idx to approximately bias the balance of the L1 signalling. This packet instructs a modulator ho... |
2a974b8006a5344345d71fc87d1c49a4 | 102 773 | 5.2.7 DVB-T2 timestamp | T2-MI packets with a packet_type of 2016 shall carry the DVB-T2 timestamp, used to synchronize the output of DVB-T2 modulators. Two mechanisms are defined; absolute and relative. The T2-MI packet payload for this data is shown in figure 10. subseconds utco 13 bits seconds_since_2000 40 bits 27 bits T2_timestamp rfu 4 b... |
2a974b8006a5344345d71fc87d1c49a4 | 102 773 | 5.2.7.1 Null timestamp | When it is not required to synchronize the output of multiple DVB-T2 modulators, the DVB-T2 timestamp shall be signalled as null by setting all bits of the T2_timestamp and utco fields to 12. When generating a composite signal, even in an MFN, Null timestamps shall not be used, to ensure the correct relative timing of ... |
2a974b8006a5344345d71fc87d1c49a4 | 102 773 | 5.2.8 Individual addressing | T2-MI packets with a packet_type of 2116 shall carry individual addressing data that can be used to configure an individual or group of modulators. The individual addressing mechanism is asynchronous and packets can be sent at any time. It is used by the modulator to update register values as and when these packets are... |
2a974b8006a5344345d71fc87d1c49a4 | 102 773 | 5.2.8.1 Existing addressing functions | The format of the individual addressing functions is in accordance with clause 6.1 of TS 101 191 [3]. Table 5 indicates which of the currently defined functions are also applicable to DVB-T2. Table 5: Existing individual addressing functions Function function_tag value Applicable to DVB-T2? Transmitter time offset 0016... |
2a974b8006a5344345d71fc87d1c49a4 | 102 773 | 5.2.8.2 Addressing functions specific to DVB-T2 | Some new functions are defined to fully support DVB-T2 as depicted in table 6. Whilst these have the same basic structure as those defined in clause 6.1 of TS 101 191 [3], the data they carry is specific to their function in a T2 system. ETSI ETSI TS 102 773 V1.3.1 (2012-01) 21 Table 6: Individual addressing functions ... |
2a974b8006a5344345d71fc87d1c49a4 | 102 773 | 5.2.8.2.1 ACE-PAPR function | The ACE-PAPR function is used to signal the Active Constellation Extension (ACE) parameters to the DVB-T2 modulator (see clause 9.6.1 of [1]). ACE has 3 parameters, G, L and Vclip that must be conveyed to all the modulators that are part of an SFN to ensure that they produce identical on-air signals. Table 7 shows the ... |
2a974b8006a5344345d71fc87d1c49a4 | 102 773 | 5.2.8.2.2 MISO group function | This function allows the MISO group (see clause 9.6.1 of [1] and annex D) to be signalled to a DVB-T2 modulator. Table 8 shows the format of the individual addressing function. Table 8: MISO group function Syntax Number of bits Format tx_MISO_function() { function_tag 8 uimsbf function_length 8 uimsbf function_body() {... |
2a974b8006a5344345d71fc87d1c49a4 | 102 773 | 5.2.8.2.3 TR-PAPR function | The TR-PAPR function is used to signal the Tone Reservation (TR) parameters to the DVB-T2 modulator (see clause 9.6.2 of [1]). TR has a single parameter Vclip that must be conveyed to all the modulators that are part of an SFN to ensure that they produce identical on-air signals. Table 9 shows how these parameters are ... |
2a974b8006a5344345d71fc87d1c49a4 | 102 773 | 5.2.8.2.4 L1-ACE-PAPR function | The L1-ACE-PAPR function is used to signal the Active Constellation Extension (ACE) parameters that are applied to the use of ACE on the L1 signalling cells (only) to the DVB-T2 modulator (see clause 9.6.1 of [1]). The L1-ACE has one parameter CL1_ACE_MAX that must be conveyed to all the modulators that are part of an ... |
2a974b8006a5344345d71fc87d1c49a4 | 102 773 | 5.2.8.2.5 TX-SIG FEF Sequence Numbers function | This function is used to signal the sequence numbers used by a DVB-T2 modulator when generating a Transmitter Signature contained within a FEF part (see clause 6 of [9]). The Transmitter Signature has two values of a parameter h that are used to select which Generalised Orthogonal Sequence Sh is transmitted in each of ... |
2a974b8006a5344345d71fc87d1c49a4 | 102 773 | 5.2.8.2.6 TX-SIG aux stream transmitter ID function | This function is used to signal the transmitter ID used by a DVB-T2 modulator when generating a Transmitter Signature contained within an auxiliary stream (see clause 5 of [9]). The Transmitter Signature denotes the individual transmitters to be signalled as having a transmitter ID of tx_id_1, tx_id_2, … tx_id_M, i.e. ... |
2a974b8006a5344345d71fc87d1c49a4 | 102 773 | 5.2.9 FEF part: Null | T2-MI packets with a packet_type of 3016 shall carry information related to a FEF part, in accordance with [1], clause 8.4, during which no signal shall be generated by a single profile modulator apart from the P1 preamble. The T2-MI packet payload is shown in figure 12. fef_idx 8 bits rfu 9 bits s1_field 3 bits s2_fie... |
2a974b8006a5344345d71fc87d1c49a4 | 102 773 | 5.2.10 FEF part: I/Q data | T2-MI packets with a packet_type of 3116 shall carry information related to a FEF part, in accordance with [1], clause 8.4, together with I/Q data to be transmitted during the FEF part. The T2-MI packet payload is shown in figure 13. fef_idx 8 bits rfu 9 bits s1_field 3 bits s2_field 4 bits fef_part_data variable Figur... |
2a974b8006a5344345d71fc87d1c49a4 | 102 773 | 5.2.11 FEF part: composite | T2-MI packets with a packet_type of 3216 shall carry information related to a FEF part, in accordance with [1], clause 8.4, formed as a composite of sub-parts as depicted in figure 14. ETSI ETSI TS 102 773 V1.3.1 (2012-01) 26 P1 sub-part index 0 sub-part index 1 sub-part index P-1 ... FEF-part FEF_LENGTH subpart_length... |
2a974b8006a5344345d71fc87d1c49a4 | 102 773 | 5.2.12 FEF sub-part | T2-MI packets with a packet_type of 3316 shall carry information related to a FEF sub-part as shown in figure 16. fef_idx 8 bits rfu1 32 bits subpart_idx 16 bits subpart_variety 16 bits subpart_length 22 bits rfu2 10 bits subpart() variable tx_identifier 16 bits Figure 16: FEF part: sub-part payload fef_idx (8 bits) in... |
2a974b8006a5344345d71fc87d1c49a4 | 102 773 | 5.2.12.1 FEF sub-part: Null | This sub-part variety instructs a modulator to transmit a null sub-part during which no signal shall be generated by the modulator. Its format is described in table 14. Table 14: FEF sub-part: Null Format Number of bits Format subpart() { reserved_for_future_use 32 bflbf } reserved_for_future_use (32 bits) are reserved... |
2a974b8006a5344345d71fc87d1c49a4 | 102 773 | 5.2.12.2 FEF sub-part: IQ | This sub-part variety instructs a modulator to transmit a set time-domain IQ samples for the duration of the sub-part. Its format is described in table 15. Table 15: FEF sub-part: IQ data Format Number of bits Format subpart() { reserved_for_future_use 32 bflbf iq_data variable (see below) } reserved_for_future_use (32... |
2a974b8006a5344345d71fc87d1c49a4 | 102 773 | 5.2.12.3 FEF sub-part: PRBS | This sub-part variety instructs a modulator to transmit a sub-part containing data generated by a PRBS. Its format is shown in table 16. Table 16: FEF sub-part: IQ data Format Number of bits Format subpart() { prbs_type 8 uimsbf reserved_for_future_use 96 bflbf } prbs_type (8 bits) indicates the type of PRBS and techni... |
2a974b8006a5344345d71fc87d1c49a4 | 102 773 | 5.2.12.4 FEF sub-part: TX-SIG FEF | This sub-part variety instructs a modulator to form a sub-part during which time a Transmitter Signature using a FEF [9] shall be transmitted. Its format is shown in table 18. ETSI ETSI TS 102 773 V1.3.1 (2012-01) 29 Table 18: FEF sub-part: TX-SIG using a FEF Format Number of bits Format subpart() { reserved_for_future... |
2a974b8006a5344345d71fc87d1c49a4 | 102 773 | 5.3 Generation of L1 signalling from the T2-MI packets | The behaviour of a DVB-T2 modulator operating with a T2-MI signal as described by the present document is defined by the DVB-T2 specification [1] of the signal-on-air combined with the definition of the content of the various T2-MI packets, together with certain configuration parameters for the individual modulator. Mo... |
2a974b8006a5344345d71fc87d1c49a4 | 102 773 | 5.4 Transmission order of T2-MI packets | The T2-MI packets with packet_type 0016 (BB-Frames) for a given PLP shall be sent in the original order of the Baseband Frames they encapsulate. The transmission of such T2-MI packets is mandatory. The T2-MI packets with packet_type 0116 (Auxiliary streams) with a given value of aux_id and packets with packet_type 0216... |
2a974b8006a5344345d71fc87d1c49a4 | 102 773 | 5.5 Timing of T2-MI packet transmission | In this clause, Tmin1, Tmin2, Tmin3, Tmax1, Tmax2 , Tmax3 and Tmax4 represent specification values for a modulator and should be quoted by modulator manufacturers. Network operators should design the timing of a network carrying T2-MI taking into account the values for each of the modulators in the network. The T2-MI p... |
2a974b8006a5344345d71fc87d1c49a4 | 102 773 | 6 Transport of T2-MI packets | The structure of the T2-MI protocol stack described in clause 4.3 allows two mechanisms for distribution; one for traditional ASI interfaces, the other for IP based networks. Both mechanisms rely on first inserting the T2-MI packets into DVB/MPEG-2 TS packets which can then be interfaced to a distribution network via s... |
2a974b8006a5344345d71fc87d1c49a4 | 102 773 | 6.1 Encapsulation of T2-MI packets in MPEG-2 TS | The insertion of T2-MI packets into MPEG-2 TS packets shall be in accordance with EN 301 192 [4], clause 4, "Data Piping". This mechanism allows for the insertion of data directly into the payload of MPEG-2 TS packets with the minimum of additional overhead. ETSI ETSI TS 102 773 V1.3.1 (2012-01) 33 |
2a974b8006a5344345d71fc87d1c49a4 | 102 773 | 6.1.1 Description | The T2-MI packets are inserted, one after another, into the payload of MPEG-2 TS packets. Each new T2-MI packet shall start immediately following the previous one. A TS packet may contain more than one T2-MI packet. T2-MI packets that are too big to fit into the payload of a single TS packet shall be split across multi... |
2a974b8006a5344345d71fc87d1c49a4 | 102 773 | 6.2 Encapsulation of MPEG-2 TS in IP packets | A DVB-T2 modulator may support the transport of MPEG-2 TS over IP. In case the DVB-T2 modulator supports IP-based delivery, the transport of MPEG-2 TS over IP shall follow the specification in this clause. The transport of MPEG-2 TS over IP relies on the methods specified in TS 102 034 [5]. This clause specifies a prot... |
2a974b8006a5344345d71fc87d1c49a4 | 102 773 | 6.2.1 Setup Information | For delivering FEC-protected, multicast MPEG-2 Transport Streams over RTP using the protocols in TS 102 034 [5], the following setup information should be provided according to [5], clause 5.2.6.2, table 4: • IPMulticastAddress: - IPMulticastAddress@Source: Optionally the IP unicast address of the source of the TS may ... |
2a974b8006a5344345d71fc87d1c49a4 | 102 773 | 6.2.2 Transport Protocols | Where the MPEG-2 TS is transported over IP, the MPEG-2 TS shall be encapsulated in RTP (Real-time Transport Protocol) according to RFC 3550 [6] as specified in TS 102 034 [5], clause 7.1.1. RTCP sender reports and receiver reports shall not be used. FEC protection of the MPEG-2 Transport Stream may be provided accordin... |
2a974b8006a5344345d71fc87d1c49a4 | 102 773 | 6.2.3 Session Initiation and Control | Session initiation is outside the scope of the specification. The session initiation and control for the multicast distribution according to TS 102 034 [5], clause 7.3.1 may be used. |
2a974b8006a5344345d71fc87d1c49a4 | 102 773 | 6.2.4 Network Requirements | The network requirements for the multicast distribution shall be in accordance with TS 102 034 [5], clause 7.2. In case application layer FEC is applied, the network requirements may be relaxed. For configuration examples of application layer FEC for different network characteristics, refer to DVB BlueBook A115 [i.3]. ... |
883651f8a8ad66ad16cf8e6f86cfe3f0 | 102 772 | 1 Scope | The present document specifies a protection scheme for the MPE sections specifically adapted for broadcasting environments supporting long duration fadings such as DVB-SH. • Clause 3 introduces the (normative) definitions, symbols and abbreviations. • Clause 4 introduces the (normative) sender operation. The present do... |
883651f8a8ad66ad16cf8e6f86cfe3f0 | 102 772 | 2 References | References are either specific (identified by date of publication and/or edition number or version number) or non-specific. For specific references, only the cited version applies. For non-specific references, the latest version of the reference document (including any amendments) applies. Referenced documents which ar... |
883651f8a8ad66ad16cf8e6f86cfe3f0 | 102 772 | 2.1 Normative references | The following referenced documents are necessary for the application of the present document. [1] ETSI EN 301 192 (V1.4.1): "Digital Video Broadcasting (DVB); DVB Specification for Data Broadcasting". [2] ETSI TS 102 472 (V1.2.1): "Digital Video Broadcasting (DVB); IP Datacast over DVB-H: Content Delivery Protocols". [... |
883651f8a8ad66ad16cf8e6f86cfe3f0 | 102 772 | 2.2 Informative references | The following referenced documents are not necessary for the application of the present document but they assist the user with regard to a particular subject area. Not applicable. |
883651f8a8ad66ad16cf8e6f86cfe3f0 | 102 772 | 3 Definitions, symbols and abbreviations | |
883651f8a8ad66ad16cf8e6f86cfe3f0 | 102 772 | 3.1 Definitions | For the purposes of the present document, the following terms and definitions apply: Application Data Sub Table (ADST): function used to map IP datagrams in Application Data Tables (ADTs) NOTE: The Application Data Sub Table (ADST) is a function that allows mapping of a datagram burst to an ADT: ADST(j) refers to the j... |
883651f8a8ad66ad16cf8e6f86cfe3f0 | 102 772 | 3.2 Symbols | For the purposes of the present document, the following symbols apply. • All symbols and parameters are in italics. EXAMPLE 1: datagram_burst_size(k) EXAMPLE 2: parameter k • All fields that are transmitted are denoted with police courier new. EXAMPLE: burst_number ETSI ETSI TS 102 772 V1.1.1 (2010-09) 12 • All functio... |
883651f8a8ad66ad16cf8e6f86cfe3f0 | 102 772 | 3.3 Abbreviations | For the purposes of the present document, the following abbreviations apply: ADST Application Data Sub Table ADT Application Data Table CRC Cyclic Redundancy Check DSMCC Digital Storage Media Command and Control DVB-H Digital Video Broadcast Handheld DVB-SH Digital Video Broadcast Satellite Handheld EM Encoding Matrix ... |
883651f8a8ad66ad16cf8e6f86cfe3f0 | 102 772 | 4 Sender operation | |
883651f8a8ad66ad16cf8e6f86cfe3f0 | 102 772 | 4.1 Introduction | According to figure 1, the sender operation takes as its input the datagram bursts and generates at its output the time- slice bursts. The flow diagram of the sender operation is shown in figure 4. The initialization process before receiving the first datagram burst is described in clause 4.3. Then following procedure ... |
883651f8a8ad66ad16cf8e6f86cfe3f0 | 102 772 | 4.2 Parameters | The following parameters are assumed to be available to the sender process and either by direct signalling or by indirect computation. The carriage or derivation of the parameters is detailed in clause 6. Only those parameters required in clause 4 are presented; as a consequence those parameters that are used only by t... |
883651f8a8ad66ad16cf8e6f86cfe3f0 | 102 772 | 4.3 Initialization | Before the first datagram burst is received, the following actions are required: • The internal burst number k is set to any suitable value, e.g. kmax-1. • M concurrent encoding matrices are allocated, each with one ADT of size K times T and one iFDT with size N times T. • Each ADT and iFDT is filled entirely with 0 by... |
883651f8a8ad66ad16cf8e6f86cfe3f0 | 102 772 | 4.4 Reception of New Datagram Burst | With the reception of a new datagram burst, the following steps are carried out: • Assign datagram burst number k by incrementing counter k of one unit. • Store the corresponding datagram burst size datagram_burst_size(k). • Store the datagram burst k such that it can be delivered after delay D. ETSI ETSI TS 102 772 V1... |
883651f8a8ad66ad16cf8e6f86cfe3f0 | 102 772 | 4.5 Generation of IFEC-Burst | An IFEC burst is generated taking into account the current burst number k, data in iFDTs, as well as the datagram burst size of previous datagram bursts. In total, at most R IFEC sections are generated for each IFEC burst. Each IFEC section in this burst gets assigned a unique IFEC burst number k'=k [kmax]. In addition... |
883651f8a8ad66ad16cf8e6f86cfe3f0 | 102 772 | 4.6 Time-Slice Burst Generation and Sending | The time-slice burst is generated from the MPE sections obtained from datagram burst k-D, possibly from the corresponding MPE-FEC sections included in this burst k-D, and the IFEC sections of the corresponding IFEC burst generated when datagram burst k was received. The rules for generating this time-slice burst are li... |
883651f8a8ad66ad16cf8e6f86cfe3f0 | 102 772 | 4.7 Datagram Burst to ADT Mapping | The datagram burst k is mapped by ADST function to the ADT, including the necessary padding as specified in clause 3. Then, for j= all 0,…,C-1 the ADST columns ADST(j) are shifted into ADT(m), whereby: • k'=k[kmax] and m = adt_index(k', j). • Shifting means that column ADST(j) is inserted at the right of ADT(m) moving ... |
883651f8a8ad66ad16cf8e6f86cfe3f0 | 102 772 | 4.8 Generation of iFDT | If the next burst number k+1 is a multiple of the encoding period EP it is necessary to generate the N parity symbols in iFDT(m) from the K data symbols in ADT(m), with m= floor(k/EP) [M]. The details of iFDT generation are presented in clause 6 and depend on T_code signalled in id_selector_bytes of time_slicing_fec_de... |
883651f8a8ad66ad16cf8e6f86cfe3f0 | 102 772 | 5 Carriage of MPE-IFEC sections (normative) | |
883651f8a8ad66ad16cf8e6f86cfe3f0 | 102 772 | 5.1 Generalities | When time_slice_fec_identifier_descriptor specifies that MPE-IFEC is used on an elementary stream, the MPE-IFEC parity of each Time-Slice burst SHALL be delivered in MPE-IFEC sections described in table 2. MPE-IFEC sections are carried in the same elementary stream as the corresponding MPE data sections. |
883651f8a8ad66ad16cf8e6f86cfe3f0 | 102 772 | 5.2 Syntax and semantics | MPE-IFEC sections are compliant to the DSMCC_section Type "User private" in ISO/IEC 13818-6 [4]. The mapping of the section into MPEG-2 Transport Stream packets is defined in ISO/IEC 13818-1 [5]. The syntax and semantics of the MPE-IFEC section are defined in table 2. Table 2: MPE-IFEC section Syntax Number of bits Ide... |
883651f8a8ad66ad16cf8e6f86cfe3f0 | 102 772 | 5.3 Real time parameters | Each MPE-IFEC section SHALL carry real time parameters described in table 3. Table 3: Time Slicing and MPE-IFEC real time parameters Syntax Number of bits Identifier real_time_parameters () { delta_t 12 uimsbf MPE_boundary 1 bslbf frame_boundary 1 bslbf prev_burst_size 18 uimsbf } delta_t: Usage of this 12-bit field de... |
883651f8a8ad66ad16cf8e6f86cfe3f0 | 102 772 | 6 Time Slice and FEC identifier descriptor (normative) | |
883651f8a8ad66ad16cf8e6f86cfe3f0 | 102 772 | 6.1 Introduction (informative) | This descriptor identifies whether MPE-IFEC is used on an elementary stream, in addition to the signalling of MPE-FEC. So the current specification comes in addition to the one found in [1], clause 9.5 without contradicting it. In particular absolutely no change has been done on fields used by MPE-FEC. The differences ... |
883651f8a8ad66ad16cf8e6f86cfe3f0 | 102 772 | 6.2 Descriptor (normative) | Table 4: Time Slice and FEC identifier descriptor Syntax Number of bits Identifier time_slice_fec_identifier_descriptor () { descriptor_tag 8 uimsbf descriptor_length 8 uimsbf time_slicing 1 bslbf mpe_fec 2 uimsbf reserved_for_future_use 2 bslbf frame_size 3 uimsbf max_burst_duration 8 uimsbf max_average_rate 4 uimsbf ... |
883651f8a8ad66ad16cf8e6f86cfe3f0 | 102 772 | 6.3 Sliding Encoding with RS code (normative) | |
883651f8a8ad66ad16cf8e6f86cfe3f0 | 102 772 | 6.3.1 General | This encoding scheme is an extension of the MPE-FEC. It uses the same encoding parity code as the MPE-FEC, benefiting from its existing hardware support. |
883651f8a8ad66ad16cf8e6f86cfe3f0 | 102 772 | 6.3.2 Parameter Definitions | The following parameter restrictions apply: • The T_code value SHALL be set to 00. • The encoding period MUST be set to 1, i.e. EP is set to 1. • The IFEC data spread, B, is signalled in the id_selector_byte->B, [0;255]. • The IFEC spread, S, is signalled in the id_selector_byte->S, [0;255]. • The data burst delay, D, ... |
883651f8a8ad66ad16cf8e6f86cfe3f0 | 102 772 | 6.3.3 Mapping Functions | The following parameter mapping functions SHALL be used: • The ADT index for a given modulo datagram burst number k' and a given ADST column number j is given as: - adt_index(k', j) = (k' + j[B])[M] • The iFDT index for a given modulo datagram burst number k' and a given section index number j is given as: - ifdt_index... |
883651f8a8ad66ad16cf8e6f86cfe3f0 | 102 772 | 6.3.4 Generation of iFDT | For a given ADT, the generation of the iFDT follows the definition of [1], clause 9.5.1. Any K<191 is achieved by shortening as specified in [1], clause 9.3.3.1. Any N<64 is achieved by puncturing as specified in [1], clause 9.3.3.2. |
883651f8a8ad66ad16cf8e6f86cfe3f0 | 102 772 | 6.3.5 Memory considerations | See TS 102 584 [3], clause 6. |
883651f8a8ad66ad16cf8e6f86cfe3f0 | 102 772 | 6.4 Generalized Encoding with Raptor code (informative) | |
883651f8a8ad66ad16cf8e6f86cfe3f0 | 102 772 | 6.4.1 General | The inclusion of a Raptor encoding scheme extends the flexibility compared to the sliding RS scheme as presented in clause 6.3. This is achieved as the ADT size can be increased significantly and one MAY benefit from the possibility of a full software implementation of the IFEC decoding. In case that this encoding sche... |
883651f8a8ad66ad16cf8e6f86cfe3f0 | 102 772 | 6.4.2 Parameter Definitions | The following parameter restrictions apply: • The T_code value SHALL be set to 01. • The encoding period EP is signalled in the id_selector_byte->EP, [0;255]. • The IFEC data spread, B, is signalled in the id_selector_byte->B, [0;255]. • The IFEC spread, S, is signalled in the id_selector_byte->S, [0;255]. • The data b... |
883651f8a8ad66ad16cf8e6f86cfe3f0 | 102 772 | 6.4.3 Mapping Functions | The following parameter mapping functions SHALL be used: • The ADT index for a given modulo datagram burst number k' and a given ADST column number j is given as: - adt_index(k', j) = ( floor(k'/EP) + j[B])[M] • The ADT column for a given modulo datagram burst number k' and a given ADST column number j is given as: - a... |
883651f8a8ad66ad16cf8e6f86cfe3f0 | 102 772 | 6.4.4 Generation of iFDT | The iFDT is generated using the Systematic Raptor Encoder as specified in [2], clause C.4, whereby: • The ADT corresponds to a source block. • Columns of the ADT correspond to source symbols. • Columns of the iFDT correspond to repair symbols. The source block size K is defined as C*EP, the symbol size T corresponds to... |
883651f8a8ad66ad16cf8e6f86cfe3f0 | 102 772 | 6.4.5 Example Parameters | This clause provides recommendations for the setting of the transport parameters id_selector_byte->G_code and id_selector_byte->C at the sender. Note that other parameters MAY be applied and signalled based on specific criteria. This recommendation is based on the following input parameters: • NBurst the maximum burst ... |
b65e1c895f8d97ce262f71305c0a2c52 | 102 744-3-7 | 1 Scope | The present document defines the extension to the Non-Access Stratum (NAS) Layer peer-to-peer interface (defined in ETSI TS 124 007 [1] and ETSI TS 124 008 [2]) of the Family SL satellite radio interface between the Radio Network Controller (RNC) and the User Equipment (UE) used in the satellite network, that is requir... |
b65e1c895f8d97ce262f71305c0a2c52 | 102 744-3-7 | 2 References | |
b65e1c895f8d97ce262f71305c0a2c52 | 102 744-3-7 | 2.1 Normative references | References are either specific (identified by date of publication and/or edition number or version number) or non-specific. For specific references, only the cited version applies. For non-specific references, the latest version of the reference document (including any amendments) applies. Referenced documents which ar... |
b65e1c895f8d97ce262f71305c0a2c52 | 102 744-3-7 | 2.2 Informative references | References are either specific (identified by date of publication and/or edition number or version number) or non-specific. For specific references, only the cited version applies. For non-specific references, the latest version of the reference document (including any amendments) applies. NOTE: While any hyperlinks in... |
b65e1c895f8d97ce262f71305c0a2c52 | 102 744-3-7 | 3 Symbols and abbreviations | |
b65e1c895f8d97ce262f71305c0a2c52 | 102 744-3-7 | 3.1 Symbols | For the purposes of the present document, the symbols in clause 3 of ETSI TS 102 744-1-4 [7] apply. |
b65e1c895f8d97ce262f71305c0a2c52 | 102 744-3-7 | 3.2 Abbreviations | For the purposes of the present document, the abbreviations in clause 3 of ETSI TS 102 744-1-4 [7] apply. |
b65e1c895f8d97ce262f71305c0a2c52 | 102 744-3-7 | 4 Introduction | |
b65e1c895f8d97ce262f71305c0a2c52 | 102 744-3-7 | 4.1 Non-Access Stratum Layer | The Non-Access Stratum (NAS) Layer provides support to the Internet Protocol (IP) Layer via the User Plane Handler (UPH), and uses the services provided by the Adaptation Layer (AL). The IP Layer provides support to routing protocols, such as the Internet Group Management Protocol (IGMP) used by IPv4 systems to report ... |
b65e1c895f8d97ce262f71305c0a2c52 | 102 744-3-7 | 4.2 Conventions used in the present document | |
b65e1c895f8d97ce262f71305c0a2c52 | 102 744-3-7 | 4.2.1 Presentation | The following conventions are applied throughout the present document: • In the ASN.1, variable names are always in lower case letters with hyphenation used to improve readability (e.g. message-type). Data Types in the ASN.1 always start with an upper case letter and may contain additional upper case letters to improve... |
b65e1c895f8d97ce262f71305c0a2c52 | 102 744-3-7 | 4.2.2 "Reserved" Fields and Values | Fields shown as Reserved BITSTRING (..) in the ASN.1 structures shall be set to zero by the sender and shall be ignored by the receiver. Values not allocated in distinguished value lists shall not be used by the sender and shall be ignored by the receiver. NOTE: Distinguished Value Lists of type Integer are being used ... |
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