1、 I n t e r n a t i o n a l T e l e c o m m u n i c a t i o n U n i o n ITU-T G.9903 TELECOMMUNICATION STANDARDIZATION SECTOR OF ITU Amendment 1 (08/2015) SERIES G: TRANSMISSION SYSTEMS AND MEDIA, DIGITAL SYSTEMS AND NETWORKS Access networks In premises networks Narrowband orthogonal frequency divisi
2、on multiplexing power line communication transceivers for G3-PLC networks Amendment 1 Recommendation ITU-T G.9903 (2014) Amendment 1 ITU-T G-SERIES RECOMMENDATIONS TRANSMISSION SYSTEMS AND MEDIA, DIGITAL SYSTEMS AND NETWORKS INTERNATIONAL TELEPHONE CONNECTIONS AND CIRCUITS G.100G.199 GENERAL CHARACT
3、ERISTICS COMMON TO ALL ANALOGUE CARRIER-TRANSMISSION SYSTEMS G.200G.299 INDIVIDUAL CHARACTERISTICS OF INTERNATIONAL CARRIER TELEPHONE SYSTEMS ON METALLIC LINES G.300G.399 GENERAL CHARACTERISTICS OF INTERNATIONAL CARRIER TELEPHONE SYSTEMS ON RADIO-RELAY OR SATELLITE LINKS AND INTERCONNECTION WITH MET
4、ALLIC LINES G.400G.449 COORDINATION OF RADIOTELEPHONY AND LINE TELEPHONY G.450G.499 TRANSMISSION MEDIA AND OPTICAL SYSTEMS CHARACTERISTICS G.600G.699 DIGITAL TERMINAL EQUIPMENTS G.700G.799 DIGITAL NETWORKS G.800G.899 DIGITAL SECTIONS AND DIGITAL LINE SYSTEM G.900G.999 MULTIMEDIA QUALITY OF SERVICE A
5、ND PERFORMANCE GENERIC AND USER-RELATED ASPECTS G.1000G.1999 TRANSMISSION MEDIA CHARACTERISTICS G.6000G.6999 DATA OVER TRANSPORT GENERIC ASPECTS G.7000G.7999 PACKET OVER TRANSPORT ASPECTS G.8000G.8999 ACCESS NETWORKS G.9000G.9999 Metallic access networks G.9700G.9799 Optical line systems for local a
6、nd access networks G.9800G.9899 In premises networks G.9900G.9999 For further details, please refer to the list of ITU-T Recommendations. Rec. ITU-T G.9903 (2014)/Amd.1 (08/2015) i Recommendation ITU-T G.9903 Narrowband orthogonal frequency division multiplexing power line communication transceivers
7、 for G3-PLC networks Amendment 1 Summary Amendment 1 to Recommendation ITU-T G.9903 (2014) adds support for coexistence with other narrowband PLC technologies via the preamble-based coexistence mechanism specified in clause 10 of IEEE 1901.2. History Edition Recommendation Approval Study Group Uniqu
8、e ID* 1.0 ITU-T G.9903 2012-10-29 15 11.1002/1000/11823 1.1 ITU-T G.9903 (2012) Amd. 1 2013-05-07 15 11.1002/1000/11897 2.0 ITU-T G.9903 2013-05-07 15 11.1002/1000/12049 3.0 ITU-T G.9903 2014-02-22 15 11.1002/1000/12088 3.1 ITU-T G.9903 (2014) Amd. 1 2015-08-13 15 11.1002/1000/12539 _ * To access th
9、e Recommendation, type the URL http:/handle.itu.int/ in the address field of your web browser, followed by the Recommendations unique ID. For example, http:/handle.itu.int/11.1002/1000/11830-en. ii Rec. ITU-T G.9903 (2014)/Amd.1 (08/2015) FOREWORD The International Telecommunication Union (ITU) is t
10、he United Nations specialized agency in the field of telecommunications, information and communication technologies (ICTs). The ITU Telecommunication Standardization Sector (ITU-T) is a permanent organ of ITU. ITU-T is responsible for studying technical, operating and tariff questions and issuing Re
11、commendations on them with a view to standardizing telecommunications on a worldwide basis. The World Telecommunication Standardization Assembly (WTSA), which meets every four years, establishes the topics for study by the ITU-T study groups which, in turn, produce Recommendations on these topics. T
12、he approval of ITU-T Recommendations is covered by the procedure laid down in WTSA Resolution 1. In some areas of information technology which fall within ITU-Ts purview, the necessary standards are prepared on a collaborative basis with ISO and IEC. NOTE In this Recommendation, the expression “Admi
13、nistration“ is used for conciseness to indicate both a telecommunication administration and a recognized operating agency. Compliance with this Recommendation is voluntary. However, the Recommendation may contain certain mandatory provisions (to ensure, e.g., interoperability or applicability) and c
14、ompliance with the Recommendation is achieved when all of these mandatory provisions are met. The words “shall“ or some other obligatory language such as “must“ and the negative equivalents are used to express requirements. The use of such words does not suggest that compliance with the Recommendati
15、on is required of any party. INTELLECTUAL PROPERTY RIGHTSITU draws attention to the possibility that the practice or implementation of this Recommendation may involve the use of a claimed Intellectual Property Right. ITU takes no position concerning the evidence, validity or applicability of claimed
16、 Intellectual Property Rights, whether asserted by ITU members or others outside of the Recommendation development process. As of the date of approval of this Recommendation, ITU had received notice of intellectual property, protected by patents, which may be required to implement this Recommendatio
17、n. However, implementers are cautioned that this may not represent the latest information and are therefore strongly urged to consult the TSB patent database at http:/www.itu.int/ITU-T/ipr/. ITU 2015 All rights reserved. No part of this publication may be reproduced, by any means whatsoever, without
18、 the prior written permission of ITU. Rec. ITU-T G.9903 (2014)/Amd.1 (08/2015) 1 Recommendation ITU-T G.9903 Narrowband orthogonal frequency division multiplexing power line communication transceivers for G3-PLC networks Amendment 1 1) Scope This amendment adds support for coexistence with other nar
19、rowband PLC technologies via the preamble-based coexistence mechanism specified in clause 10 of IEEE 1901.2. 2) Modifications to ITU-T G.9903 2.1) References In clause 2, add the following entry after “IEEE 802.15.4“. IEEE 1901.2 IEEE 1901.2 (2013), IEEE standard for low-frequency (less than 500 kHz
20、) narrowband power line communications for smart grid applications. 2.2) Coexistence with other PLC networks Modify clause 6.2 as indicated by the tracked changes. 6.2 Coexistence with other PLC networks Three Two mechanisms are defined to allow coexistence between ITU-T G.9903 devices and other NB-
21、narrowband PLC technologies operating in the same frequency brangeand: frequency division coexistence; preamble-based coexistence. Frequency division (FD) coexistence mechanism: allows suppressing interference from ITU-T G.9903 devices into a particular frequency band or bands by using non-overlappi
22、ng ITU-T G.9903 bandplans. Flexible use of different bandplans provides an opportunity to separate systems operating over the same medium in non-overlapping bandplans. The FD coexistence mechanism can provide coexistence with both single and multiple carrier PLC systems. Frequency notching coexisten
23、ce mechanism: shall be used to suppress interference from ITU-T G.9903 devices into a particular (relatively narrow) frequency range by notching out one or more subcarriers (see clause B.3 of ITU-T G.9901). Frequency notching allows ITU-T G.9903 devices to coexist with the existing narrowband FSK/PS
24、K systems operating over the same frequency band. Preamble-based coexistence mechanism shall be used by ITU-T G.9903 devices to fairly share the medium with other types of PLC technologies operating over the same frequency band (and utilizing this coexistence mechanism). The definition of this coexi
25、stence mechanism is for further study. This same coexistence mechanism also facilitates coexistence between ITU-T G.9903 implementations using different overlapping bandplans. This coexistence mechanism shall be mandatory with the exception of when the network is operated in frequency bands restrict
26、ed to monitoring or controlling the operation of the grid, in which case coexistence is optional. The above coexistence mechanisms can be applied simultaneously, enabling ITU-T G.9903 devices to coexist with multiple PLC technologies operating over the same medium. 2 Rec. ITU-T G.9903 (2014)/Amd.1 (
27、08/2015) 2.3) Frequency division coexistence and preamble-based coexistence Add clauses 6.2.1 and 6.2.2 after clause 6.2. 6.2.1 Frequency division coexistence mechanism A first method consists in assigning non-overlapping bandplans to devices complying with this Recommendation in communication range
28、. A second method is to exploit the tone masking (see clause 7.15 and description of macToneMask attribute in Table 9-15) feature to avoid any overlapping frequencies. Frequency division coexistence provides a means to ensure coexistence between devices complying with this Recommendation and both si
29、ngle (e.g., existing narrowband FSK/PSK systems) and multiple carrier PLC systems. 6.2.2 Preamble-based coexistence mechanism (optional) Devices complying with this Recommendation may support the preamble-based coexistence mechanism specified in clauses 10.2.2 and 10.3 to 10.5 of IEEE 1901.2 to fair
30、ly share the medium with other types of narrowband PLC technologies supporting the same preamble-based coexistence mechanism. Support for this coexistence mechanism is optional in this Recommendation, with the exception given in Annex G. If devices complying with this Recommendation support the prea
31、mble-based coexistence mechanism, then Tables 10-2 and 10-3 of IEEE 1901.2 shall be revised as specified below. The IDs (identifiers) listed in Table 10-2 of IEEE 1901.2 shall be replaced by the identifiers listed in Table 6-1. Table 6-1 Attributes for the preamble-based coexistence mechanism Attrib
32、ute Identifier Beta 0x0117 aMacMaxCoexistenceBackoffs 0x0118 macAlpha 0x0119 K 0x011A macNdcTime 0x011B NOTE The other attributes listed in Table 10-2 of IEEE 1901.2 (aCEIFS, macLongPreambleDuration, macDCEIFS, macMinChannelIdleTime) do not require an identifier as their values depend exclusively on
33、 the values of other attributes which have their own identifier. The IDs (identifiers) and default values listed in Table 10-3 of IEEE 1901.2 shall be replaced by the ones listed in Table 6-2. Table 6-2 Coexistence control PIB attributes Attribute Identifier Default Value macCoexPreambleDetectionEna
34、bled 0x011C FALSE macCoexPreambleEnabled 0x011D FALSE Rec. ITU-T G.9903 (2014)/Amd.1 (08/2015) 3 2.4) Annex G Introduce Annex G after Annex F. Annex G Regional requirements for the USA (This annex forms an integral part of this Recommendation.) This annex describes the domestic practices, standards
35、and the application method for the preamble-based coexistence mechanism in clause 6.2.2 in the USA. For devices complying with this Recommendation operating in the USA, the default value of attribute macCoexPreambleDetectionEnabled shall be set to TRUE see Table 6-2. If the coexistence preamble is d
36、etected, then at least one narrowband PLC technology using a native preamble different from the one specified in this Recommendation is present and operating over the same frequency band. In this case, attribute macCoexPreambleEnabled (see Table 6.2) shall also be set to TRUE. Printed in Switzerland
37、 Geneva, 2015 SERIES OF ITU-T RECOMMENDATIONS Series A Organization of the work of ITU-T Series D General tariff principles Series E Overall network operation, telephone service, service operation and human factors Series F Non-telephone telecommunication services Series G Transmission systems and m
38、edia, digital systems and networks Series H Audiovisual and multimedia systems Series I Integrated services digital network Series J Cable networks and transmission of television, sound programme and other multimedia signals Series K Protection against interference Series L Environment and ICTs, cli
39、mate change, e-waste, energy efficiency; construction, installation and protection of cables and other elements of outside plant Series M Telecommunication management, including TMN and network maintenance Series N Maintenance: international sound programme and television transmission circuits Serie
40、s O Specifications of measuring equipment Series P Terminals and subjective and objective assessment methods Series Q Switching and signalling Series R Telegraph transmission Series S Telegraph services terminal equipment Series T Terminals for telematic services Series U Telegraph switching Series V Data communication over the telephone network Series X Data networks, open system communications and security Series Y Global information infrastructure, Internet protocol aspects and next-generation networks Series Z Languages and general software aspects for telecommunication systems
