1、DRAFT FOR DEVELOPMENT DD IEC TS 61334-5-5:2001 Distribution automation using distribution line carrier systems Part 5-5: Lower layer profiles Spread spectrum-fast frequency hopping (SS-FFH) profile ICS 29.240.01 NO COPYING WITHOUT BSI PERMISSION EXCEPT AS PERMITTED BY COPYRIGHT LAWDD IEC TS 61334-5-
2、5:2001 This 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 2 April 2002 BSI 2 April 2002 ISBN 0 580 39263 5 National foreword This Draft
3、for Development is the English language version of IEC TS 61334-5-5:2001. 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
4、which is not an international 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 internationa
5、l organization responsible for its conversion into an 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
6、 period will be notified by 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 Te
7、chnical Committee PEL/57, Power system control and associated communications, 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 obt
8、ained on request to its secretary. Cross-references The British 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”
9、facility of the BSI Standards Electronic Catalogue. Summary of pages This document comprises a front cover, an inside front cover, the IEC TS title page, pages 2 to 30, an inside back cover and a back cover. The BSI copyright date displayed in this document indicates when the document was last issue
10、d. Amendments issued since publication Amd . No. Date CommentsTECHNICAL SPECIFICATION IECTS 61334-5-5 First edition 2001-09 Distribution automation using distribution line carrier systems Part 5-5: Lower layer profiles Spread spectrum-fast frequency hopping (SS-FFH) profile Reference number IEC/TS 6
11、1334-5-5:2001(E) DDIECTS6133455:2001 2 TS 31643-5-5 IE:C2100(E) CONTENTS FOREWORD 3 INTRODUCTION 5 1 Scope and object . 6 2 Normative references. 6 3 Abbreviations and definitions . 7 3.1 Abbreviations 7 3.2 Definitions 7 4 Physical layer 8 4.1 Purpose 8 4.2 Electrical characteristics . 8 4.3 Modula
12、tion principle 8 4.4 Receiver principle . 9 4.5 Synchronization 9 4.6 Frequency sets . 10 4.7 Physical frame encapsulation 10 4.8 Symbol, bit and byte encoding 11 4.9 Important parameters 11 4.10 Physical layer data services 11 4.11 Physical layer management interface 13 4.12 Physical layer states.
13、14 5 Medium access control sublayer 16 5.1 Outline 16 5.2 Repeater principle. 20 5.3 MAC layer data service definition 20 5.4 MAC layer timeout values . 22 5.5 MAC sublayer management services 23 5.6 MAC layer states 27 Figure 1 Time representation of M = 3 SS-FFH symbol 8 Figure 2 Coding of informa
14、tion symbols in sequence of carrier chips. 8 Figure 3 Actual P_PDU representation 11 Figure 4 MAC services 17 Figure 5 Frame decomposition 19 Figure 6 MAC management services . 23 Figure 7 Example segmentation of M_SDU 29 DDIECTS6133455:2001 BSI2April2002 2TS 31643-5-5 IE:C2100(E) 3 INTERNATIONAL EL
15、ECTROTECHNICAL COMMISSION _ DISTRIBUTION AUTOMATION USING DISTRIBUTION LINE CARRIER SYSTEMS Part 5-5: Lower layer profiles Spread spectrum-fast frequency hopping (SS-FFH) profile FOREWORD 1) The IEC (International Electrotechnical Commission) is a worldwide organization for standardization comprisin
16、g all national electrotechnical committees (IEC National Committees). The object of the IEC is to promote international co-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 S
17、tandards. Their preparation is entrusted to technical committees; any IEC National Committee interested in the subject dealt with may participate in this preparatory work. International, governmental and non-governmental organizations liaising with the IEC also participate in this preparation. The I
18、EC collaborates closely with the International Organization for Standardization (ISO) in accordance with conditions determined 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
19、of opinion on the relevant subjects since each technical committee has representation from all interested National Committees. 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 g
20、uides and they are accepted by the National Committees in that sense. 4) In order to promote international unification, IEC National Committees undertake to apply IEC International Standards transparently to the maximum extent possible in their national and regional standards. Any divergence between
21、 the IEC Standard and the corresponding national or regional standard shall be clearly indicated in the latter. 5) The IEC 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
22、is drawn to the possibility that some of the elements of this technical specification may be the subject of patent rights. 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 exceptio
23、nal circumstances, a technical committee may propose the publication of a technical specification when the required support 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 reaso
24、n, there is the future but no immediate possibility of an agreement on an International Standard. IEC 61334-5-5, which is 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
25、on the following documents: Enquiry draft Report on voting 57/489/CDV 57/518/RVC Full information on the voting for the approval 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 Directi
26、ves, Part 3. DDIECTS6133455:2001 BSI2April2002 3 4 TS 31643-5-5 IE:C2100(E) The committee has 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 revise
27、d edition, or amended. A bilingual version of this publication may be issued at a later date. DDIECTS6133455:2001 BSI2April2002 4TS 31643-5-5 IE:C2100(E) 5 INTRODUCTION This technical specification describes a new physical layer variant with respect to the already defined modulation techniques FSK a
28、nd S-FSK within the IEC 61334 series (IEC 61334-5-1 and IEC 61334-5-2 1) ). The SS-FFH profile outlined in this technical specification basically incorporates spread spectrum modulation techniques. It offers the main advantages of very high robustness and improved EMI characteristics without sharing
29、 classical spread spectrum drawbacks such as exaggerated bandwidth demand or impractical realization. The profile specifies the physical layer including the transmission methods and the services provided by both the physical layer and medium access sublayer entities. _ 1) IEC 61334-5-1, Distribution
30、 automation using distribution line carrier systems Part 5-1: Lower layer profiles The spread frequency shift keying (S-FSK) profile IEC 61334-5-2, Distribution automation using distribution line carrier systems Part 5-2: Lower layer profiles Frequency shift keying (FSK) profile DDIECTS6133455:2001
31、BSI2April2002 5 6 TS 31643-5-5 IE:C2100(E) DISTRIBUTION AUTOMATION USING DISTRIBUTION LINE CARRIER SYSTEMS Part 5-5: Lower layer profiles Spread spectrum-fast frequency hopping (SS-FFH) profile 1 Scope and object This technical specification describes the requirements of the spread spectrum-fast fre
32、quency hopping (SS-FFH) approach for distribution line carrier communication systems. It incor- porates the primitives provided by the physical and MAC layer entities as well as the modulation and transmission methods. 2 Normative references The following normative documents contain provisions which
33、, through reference in this text, constitute provisions of this part of IEC 61334. For dated references, subsequent amend- ments to, or revisions of, any of these publications do not apply. However, parties to agreements based on this part of IEC 61334 are encouraged to investigate the possibility o
34、f 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 61000-3-8, Electromagnetic compatibility
35、 (EMC) Part 3: Limits Section 8: Signalling on low-voltage electrical installations Emission levels, frequency bands and electromagnetic disturbance levels IEC 61334-4-1, Distribution automation using distribution line carrier systems Part 4: Data communication protocols Section 1: Reference model o
36、f the communication system IEC 61334-4-32, Distribution automation using distribution line carrier systems Part 4: Data communication protocols Section 32: Data link layer Logical Link Control (UC) ITU-T Recommendation V.42, Error-correcting procedures for DCEs using asynchronous-to- synchronous con
37、version DDIECTS6133455:2001 BSI2April2002 6TS 31643-5-5 IE:C2100(E) 7 3 Abbreviations and definitions For the purpose of this technical specification, the following abbreviations and definitions apply. 3.1 Abbreviations DA Destination_address DLC Distribution Line Carrier FFH Fast Frequency Hopping
38、LV Low Voltage M_PDU MAC Layer Protocol Data Unit M_SDU MAC Layer Service Data Unit MAC, M, MA Medium Access Control MV Medium Voltage P_PDU Physical Layer Protocol Data Unit P_SDU Physical Layer Service Data Unit SC Service_class SDU Service Data Unit SS Spread Spectrum 3.2 Definitions 3.2.1 chip s
39、inusoidal carrier waveform of limited time duration. Sequences of four chips form one symbol 3.2.2 domain logical section of a DLC network 3.2.3 hops number of routing repetitions required for communication between the master and a specific station 3.2.4 preamble modulated signal sequence that prece
40、des a data frame for synchronization purpose 3.2.5 routing repetition re-sending a PDU with a modified protocol information field because the destination station can not be reached directly by the source station. The routing repetition procedure concerns only the protocol information field and is ha
41、ndled by the MAC sublayer 3.2.6 symbol modulated signal that encodes two transmitted bits DDIECTS6133455:2001 BSI2April2002 7 8 TS 31643-5-5 IE:C2100(E) 4 Physical layer 4.1 Purpose This clause details the transmission method to transport data frames provided by the MAC sublayer to and from peer MAC
42、 entities using the electrical low-voltage distribution network. It also specifies the requirements for the logical interface between the physical layer and the MAC sublayer. 4.2 Electrical characteristics The physical layer interfaces directly with the low-voltage distribution wiring as transport m
43、edium. The electrical characteristics of the distribution network are AC, 230 V, 50/60 Hz. Network coupling may be either single- or three-phase. 4.3 Modulation principle The modulation method is spread spectrum fast frequency hopping (SS-FFH) modulation. The basis of SS-FFH are time-limited sinusoi
44、dal carrier waveforms of a certain time duration T Cand different frequencies f ii = 1 . M. These carrier bursts are called chips. The reciprocal of the chip time duration T Cis called chip rate R C . An information symbol is encoded by a sequence of subsequential chips as seen in figure 1. Time T C
45、 Figure 1 Time representation of M = 3 SS-FFH symbol Each frequency is used only once per sequence. For this reason, the number of symbols that can be encoded this way is M. An example for M = 4 is given in the following. Symbol Bitmapping Chip 1 Chip 2 Chip 3 Chip 4 S 1 00 f 1 f 2 f 3 f 4 S 2 01 f
46、2 f 3 f 4 f 1 S 3 10 f 3 f 4 f 1 f 2 S 4 11 f 4 f 1 f 2 f 3 Figure 2 Coding of information symbols in sequence of carrier chips IEC 1605/01 IEC 1606/01 DDIECTS6133455:2001 BSI2April2002 8TS 31643-5-5 IE:C2100(E) 9 The mapping of symbols into two bit patterns is also shown in figure 2. The maximum nu
47、mber of bits that can be encoded with M different symbols is ld M. Thus the data rate R Dgiven the chip rate R Cis R D= M R C ld (M) Spreading the information in the described way on numerous carriers has several advantages. First-symbol detection is possible with only one carrier present which make
48、s SS-FFH very robust against interference. Second EMI regulations can be met more easily through the fact that the signalling energy is not confined to a narrow spectral segment. SS-FFH provides the robustness unique to spread spectrum systems without sharing the drawbacks such as complicated synchr
49、onization or expensive system implementation. 4.4 Receiver principle Demodulation and detection of symbols follows a soft decision algorithm. This means that quasi-analogue values for the presence or non-presence of each chip of a symbol are used for detection. Four demodulated signals, one for each frequency j = 1 4, are used for symbol detection for each of the subsequent chips k =
