1、DRAFT FOR DEVELOPMENT DD IEC TS 61334-5-3:2001 Distribution automation using distribution line carrier systems Part 5-3: Lower-layer profiles Spread spectrum adaptive wideband (SS-AW) profile ICS 33.200 NO COPYING WITHOUT BSI PERMISSION EXCEPT AS PERMITTED BY COPYRIGHT LAWDD IEC TS 61334-5-3:2001 Th
2、is Draft for Development, having been prepared under the direction of the Electrotechnical Sector Policy and Strategy Committee, was published under the authority of the Standards Policy and Strategy Committee on 27 May 2002 BSI 27 May 2002 ISBN 0 580 39709 2 National foreword This Draft for Develop
3、ment reproduces verbatim IEC TS 61334-5-3:2001. This publication is not to be regarded as a British Standard. It is being issued in the Draft for Development series of publications and is of a provisional nature because the source document is an IEC Technical Specification which is not an internatio
4、nal standard. It should be applied on this provisional basis, so that information and experience of its practical application may be obtained. Comments arising from the use of this Draft for Development are requested so that UK experience can be reported to the international organization responsible
5、 for its conversion into a international standard. A review of this publication will be initiated 2 years after its publication by the international organization so that a decision can be taken on its status at the end of its three-year life. The commencement of the review period will be notified by
6、 an announcement in Update Standards. According to the replies received by the end of the review period, the responsible BSI Committee will decide whether to support the conversion into a international Standard. Comments should be sent in writing to the Secretary of BSI Technical Committee PEL/57, T
7、elecontrol systems, at 389 Chiswick High Road, London W4 4AL, giving the document reference and clause number and proposing, where possible, an appropriate revision of the text. A list of organizations represented on this committee can be obtained on request to its secretary. Cross-references The Br
8、itish Standards which implement international or European publications referred to in this document may be found in the BSI Standards Catalogue under the section entitled “International Standards Correspondence Index”, or by using the “Find” facility of the BSI Standards Electronic Catalogue. Summar
9、y of pages This document comprises a front cover, an inside front cover, the IEC TS title page, pages 2 to 23 and a back cover. The BSI copyright date displayed in this document indicates when the document was last issued. Amendments issued since publication Amd. No. Date CommentsSPCIFICATION TECHNI
10、QUE CEI IEC TECHNICAL SPECIFICATION TS 61334-5-3 Premire dition First edition 2001-01 Automatisation de la distribution laide de systmes de communication courants porteurs Partie 5-3: Profils des couches basses Profil SS-AW (Spread Spectrum Adaptive Wideband) Distribution automation using distributi
11、on line carrier systems Part 5-3: Lower-layer profiles Spread spectrum adaptive wideband (SS-AW) profile Numro de rfrence Reference number IEC/TS 61334-5-3:2001TS -43316-53 1002:CEI 2 2 CONTENTS Page FOREWORD.3 Clause 1 General 5 1.1 Scope and object.5 1.2 Normative references 5 2 Physical layer .6
12、2.1 Purpose.6 2.2 Overview .6 2.3 Modulation method 6 2.3.1 Spreading method6 2.3.2 Raw data bit modulation.6 2.4 Transmission method 6 2.4.1 Purpose.6 2.4.2 Bit and byte ordering6 2.4.3 Preamble (Pre) 7 2.4.4 Forward error correction (FEC) 7 2.4.5 Interframe gap .7 2.5 Physical layer services speci
13、fication.8 2.5.1 Overview .8 2.5.2 P_DATA.request8 2.5.3 P_DATA.confirm 9 2.5.4 P_DATA.indication.9 2.6 Sending and receiving physical sublayer 10 2.6.1 Sending .10 2.6.2 Receiving.10 3 Medium access control (MAC) sublayer.10 3.1 MAC sublayer service specification10 3.1.1 Overview .11 3.1.2 MA_DATA.
14、request .12 3.1.3 MA_DATA.confirm .13 3.1.4 MA_DATA.indication 13 3.2 Frame formats.14 3.2.1 Frame components 14 3.2.2 Enumeration of frame types .16 3.2.3 Frame header field values20 3.2.4 Invalid Frames.20 3.3 MAC sublayer operation.21 3.3.1 Overview .21 3.3.2 Data packet exchange .21 3.3.3 Broadc
15、ast data packet exchange22 3.3.4 Polling Exchange .22 3.3.5 Token exchange 23 IECTS6133453:2001 2002yaM72ISB 2 IECTS6133453:2001 BSI27May2002 2TS -43316-53 1002:CEI 3 3 INTERNATIONAL ELECTROTECHNICAL COMMISSION _ DISTRIBUTION AUTOMATION USING DISTRIBUTION LINE CARRIER SYSTEMS Part 5-3: Lower-layer p
16、rofiles Spread spectrum adaptive wideband (SS-AW) profile FOREWORD 1) The IEC (International Electrotechnical Commission) is a worldwide organization for standardization comprising all national electrotechnical committees (IEC National Committees). The object of the IEC is to promote international c
17、o-operation on all questions concerning standardization in the electrical and electronic fields. To this end and in addition to other activities, the IEC publishes International Standards. Their preparation is entrusted to technical committees; any IEC National Committee interested in the subject de
18、alt with may participate in this preparatory work. International, governmental and non-governmental organizations liaising with the IEC also participate in this preparation. The IEC collaborates closely with the International Organization for Standardization (ISO) in accordance with conditions deter
19、mined by agreement between the two organizations. 2) The formal decisions or agreements of the IEC on technical matters express, as nearly as possible, an international consensus of opinion on the relevant subjects since each technical committee has representation from all interested National Commit
20、tees. 3) The documents produced have the form of recommendations for international use and are published in the form of standards, technical specifications, technical reports or guides and they are accepted by the National Committees in that sense. 4) In order to promote international unification, I
21、EC National Committees undertake to apply IEC International Standards transparently to the maximum extent possible in their national and regional standards. Any divergence between the IEC Standard and the corresponding national or regional standard shall be clearly indicated in the latter. 5) The IE
22、C provides no marking procedure to indicate its approval and cannot be rendered responsible for any equipment declared to be in conformity with one of its standards. 6) Attention is drawn to the possibility that some of the elements of this technical specification may be the subject of patent rights
23、. The IEC shall not be held responsible for identifying any or all such patent rights. The main task of IEC technical committees is to prepare International Standards. In exceptional circumstances, a technical committee may propose the publication of a technical specification when the required suppo
24、rt cannot be obtained for the publication of an International Standard, despite repeated efforts, or the subject is still under technical development or where, for any other reason, there is the future but no immediate possibility of an agreement on an International Standard. IEC 61334-5-3, which is
25、 a technical specification, has been prepared by IEC technical committee 57: Power system control and associated communications. The text of this technical specification is based on the following documents: Enquiry draft Report on voting 57/423/CDV 57/475/RVC Full information on the voting for the a
26、pproval of this technical specification can be found in the report on voting indicated in the above table. This publication has been drafted in accordance with the ISO/IEC Directives, Part 3. IECTS6133453:2001 2002yaM72ISB 3 IECTS6133453:2001 BSI27May2002 3TS -43316-53 1002:CEI 4 4 The committee has
27、 decided that the contents of this publication will remain unchanged until 2004. At this date, the publication will be transformed into an International Standard; reconfirmed; withdrawn; replaced by a revised edition, or amended. IECTS6133453:2001 2002yaM72ISB 4 IECTS6133453:2001 BSI27May2002 4TS -4
28、3316-53 1002:CEI 5 5 DISTRIBUTION AUTOMATION USING DISTRIBUTION LINE CARRIER SYSTEMS Part 5-3: Lower-layer profiles Spread spectrum adaptive wideband (SS-AW) profile 1 General 1.1 Scope and object This specification describes the requirements of the spread spectrum adaptive wideband (SS- AW) approac
29、h which incorporates the services provided by the physical layer entity and the MAC sublayer. The transmission medium is assumed to be the distribution network on both the MV or LV level. The MAC sublayer described in this specification interfaces with the logical link control (LLC) layer described
30、in IEC 61334-4-32. The noise and signal attenuation characteristics of the MV and LV networks require a hierarchical approach, where methods for modulation/demodulation, synchronization, equaliza- tion, error control coding, and media access control are designed specifically for this hostile communi
31、cations environment. This approach includes a low-level link protocol within the MAC sublayer that incorporates some functions generally associated with a data link control procedure. This specification describes such a hierarchical approach based on a spread spectrum physical layer with fast synchr
32、onization enabling short-duration transmissions and adaptive equalization. This coupled with a low-level link protocol, the effective utilization of error correction and detection, and robust medium access management provides a robust, reliable platform for the LLC sublayer. The adaptive component o
33、f this approach refers to the equalization method used to compensate for the time-varying nature of the communication channel impairments. The receiver must select appropriate equalization values to adapt to the changing channel characteristics, which can be node-specific, on a frame basis to achiev
34、e optimal performance. The equalization parameters are adjusted based on various quality metrics available from the received frame, for example, the Hamming distance of the synchronization preamble, the error- free status of the frame header and data block, if present, or the failure to receive an e
35、xpected response. The equalization methods are well-known and the precise method is determined by the particular implementation of this specification. This allows cost/performance trade-offs and future improvements to occur without losing compatibility. 1.2 Normative references The following normati
36、ve documents contain provisions which, through reference in this text, constitute provisions of this part of IEC 61334. For dated references, subsequent amendments to, or revisions of, any of these publications do not apply. However, parties to agreements based on this part of IEC 61334 are encourag
37、ed to investigate the possibility of applying the most recent editions of the normative documents indicated below. For undated references, the latest edition of the normative document referred to applies. Members of IEC and ISO maintain registers of currently valid International Standards. IEC 61334
38、-4-32:1996, Distribution automation using distribution line carrier systems Part 4: Data communication protocols Section 32: Data link layer Logical link control (LLC) IECTS6133453:2001 2002yaM72ISB 5 IECTS6133453:2001 BSI27May2002 5TS -43316-53 1002:CEI 6 6 2 Physical layer 2.1 Purpose This clause
39、details the services required of the physical layer at the logical interface with the MAC sublayer. Also defined is the transmission method used to provide the information flow through the low-voltage distribution network. 2.2 Overview The physical layer provides the interface to the MAC sublayer fo
40、r the transmission of data units onto the physical medium. 2.3 Modulation method The transmitter shall generate a wideband signal to conform to the signal defined in 2.3.1 and 2.3.2 with a centre frequency of f 0and a null-to-null signal bandwidth of f 0 /2 to 3/2 f 0 , where for example f 0can be 4
41、7,5 kHz. 2.3.1 Spreading method An anti-symmetric waveform is digitally synthesized using 16 bits (chips) of a 16 f 0clock. Two periods of the anti-symmetric waveform (corresponding to 32 chips of the clock) define one raw data bit interval; for example, one raw data bit interval can consist of two
42、cycles of a sine wave. 2.3.2 Raw data bit modulation Each raw data bit interval is binary phase shift keyed (BPSK) using a non-return-to-zero level (NRZ-L) format, resulting in a raw data bit rate of f 0 /2. 2.4 Transmission method 2.4.1 Purpose In order to ensure optimum performance, all MAC data-u
43、nits received for transmission are encapsulated with a preceding preamble and encoded with a forward error correcting code (FEC). A PHY_frame consists of a P_sdu (from 6 bytes to 26 bytes) the same as the M_pdu (from 3 bytes to 13 bytes) transmitted by the MAC sublayer and encoded with the FEC (see
44、2.4.4 ); a preceding preamble (5 bytes) and a succeeding interframe gap (1 byte). Preamble P_sdu Interframe gap 5 bytes 6 to 26 bytes 1 byte Figure 1 Physical frame structure 2.4.2 Bit and byte ordering The bytes are sent from most significant byte (MSB) to least significant byte (LSB). By conventio
45、n, the most significant byte corresponds to the leftmost byte. Bit fields are packed with the same convention as byte fields. That is, the first bit in an octet is the most significant (leftmost) bit. IEC 2663/2000 IECTS6133453:2001 2002yaM72ISB 6 IECTS6133453:2001 BSI27May2002 6TS -43316-53 1002:CE
46、I 7 7 2.4.3 Preamble (Pre) The preamble, which precedes every transmitted frame, delimits the start of a valid frame. It contains the necessary sequences to allow the receiver to synchronize to the transmitted frame. It consists of four synchronization (Sync) bytes followed by one end of synchroniza
47、tion (EOS) byte. Preamble field values are defined in table 2. Sync Sync Sync Sync EOS Figure 2 Preamble structure 2.4.4 Forward error correction (FEC) All bytes contained in a frame, except for the preamble bytes, are encoded using the (8,4) error correcting code of table 1. The encoding of each ni
48、bble follows a two-step process. First, an increasing offset is added to the nibble; second, the resulting nibble is encoded using the code of table 1. The offset is initialized to 0 at the start of each frame, and is increased by 3 modulo 16 for each successive nibble. Bytes are encoded least signi
49、ficant nibble first. For example, the value 70 00 (hex) is encoded as follows: Table 1 (8,4) Error correcting code 1. 0 + 0 = 0; ECC(0) = 5A (least significant nibble of 70) 2. 7 + 3 = A; ECC(A) = 96 ( most significant nibble of 70) 3. 0 + 6 = 6; ECC(6) = 2E (least significant nibble of 00) 4. 0 + 9 = 9; ECC(9) = 89 ( most significant nibble of 00) Information Code value (hexadecimal) 05 A 1
