1、raising standards worldwideNO COPYING WITHOUT BSI PERMISSION EXCEPT AS PERMITTED BY COPYRIGHT LAWBSI Standards PublicationBS ISO/IEC 24730-21:2012Information technology - Realtime locating systems (RTLS)Part 21: Direct Sequence Spread Spectrum(DSSS) 2,4 GHz air interface protocol:Transmitters operat
2、ing with a singlespread code and employing a DBPSK dataencoding and BPSK spreading schemeBS ISO/IEC 24730-21:2012 BRITISH STANDARDNational forewordThis British Standard is the UK implementation of ISO/IEC24730-21:2012. Together with BS ISO/IEC 24730-2:2012 and BS ISO/IEC 24730-22:2012, it supersedes
3、 BS ISO/IEC 24730-2:2006 which iswithdrawn.The UK participation in its preparation was entrusted to TechnicalCommittee IST/34, Automatic identification and data capturetechniques.A list of organizations represented on this committee can beobtained on request to its secretary.This publication does no
4、t purport to include all the necessaryprovisions of a contract. Users are responsible for its correctapplication. The British Standards Institution 2012. Published by BSI StandardsLimited 2012ISBN 978 0 580 74407 5ICS 35.040Compliance with a British Standard cannot confer immunity fromlegal obligati
5、ons.This British Standard was published under the authority of theStandards Policy and Strategy Committee on 30 June 2012.Amendments issued since publicationDate Text affectedBS ISO/IEC 24730-21:2012Reference numberISO/IEC 24730-21:2012(E)ISO/IEC 2012INTERNATIONAL STANDARD ISO/IEC24730-21First editi
6、on2012-06-01Information technology Real time locating systems (RTLS) Part 21: Direct Sequence Spread Spectrum (DSSS) 2,4 GHz air interface protocol: Transmitters operating with a single spread code and employing a DBPSK data encoding and BPSK spreading scheme Technologies de linformation Systmes de
7、localisation en temps rel (RTLS) Partie 21: Protocole dinterface dair 2,4 GHz dtalement de spectre squence directe (DSSS): metteurs fonctionnant avec un code dtalement unique et utilisant un codage de donnes DBPSK et un schma dtalement BPSK BS ISO/IEC 24730-21:2012ISO/IEC 24730-21:2012(E) COPYRIGHT
8、PROTECTED DOCUMENT ISO/IEC 2012 All rights reserved. Unless otherwise specified, no part of this publication may be reproduced or utilized in any form or by any means, electronic or mechanical, including photocopying and microfilm, without permission in writing from either ISO at the address below o
9、r ISOs member body in the country of the requester. ISO copyright office Case postale 56 CH-1211 Geneva 20 Tel. + 41 22 749 01 11 Fax + 41 22 749 09 47 E-mail copyrightiso.org Web www.iso.org Published in Switzerland ii ISO/IEC 2012 All rights reservedBS ISO/IEC 24730-21:2012ISO/IEC 24730-21:2012(E)
10、 ISO/IEC 2012 All rights reserved iiiForeword ISO (the International Organization for Standardization) and IEC (the International Electrotechnical Commission) form the specialized system for worldwide standardization. National bodies that are members of ISO or IEC participate in the development of I
11、nternational Standards through technical committees established by the respective organization to deal with particular fields of technical activity. ISO and IEC technical committees collaborate in fields of mutual interest. Other international organizations, governmental and non-governmental, in lia
12、ison with ISO and IEC, also take part in the work. In the field of information technology, ISO and IEC have established a joint technical committee, ISO/IEC JTC 1. International Standards are drafted in accordance with the rules given in the ISO/IEC Directives, Part 2. The main task of the joint tec
13、hnical committee is to prepare International Standards. Draft International Standards adopted by the joint technical committee are circulated to national bodies for voting. Publication as an International Standard requires approval by at least 75 % of the national bodies casting a vote. Attention is
14、 drawn to the possibility that some of the elements of this document may be the subject of patent rights. ISO and IEC shall not be held responsible for identifying any or all such patent rights. ISO/IEC 24730-2 was prepared by Joint Technical Committee ISO/IEC JTC 1, Information technology, Subcommi
15、ttee SC 31, Automatic identification and data capture techniques. This first edition of ISO/IEC 24730-21, together with ISO/IEC 24730-2 and ISO/IEC 24730-22, cancels and replaces the first edition of ISO/IEC 24730-2:2006, which has been technically revised. ISO/IEC 24730 consists of the following pa
16、rts, under the general title Information technology Real time locating systems (RTLS): Part 1: Application program interface (API) Part 2: Direct Sequence Spread Spectrum (DSSS) 2,4 GHz air interface protocol Part 21: Direct Sequence Spread Spectrum (DSSS) 2,4 GHz air interface protocol: Transmitter
17、s operating with a single spread code and employing a DBPSK data encoding and BPSK spreading scheme Part 22: Direct Sequence Spread Spectrum (DSSS) 2,4 GHz air interface protocol: Transmitters operating with multiple spread codes and employing a QPSK data encoding and Walsh offset QPSK (WOQPSK) spre
18、ading scheme Part 5: Chirp spread spectrum (CSS) at 2,4 GHz air interface Part 6: Ultra Wide Band Air Interface protocol Part 61: Low rate pulse repetition frequency Ultra Wide Band (UWB) air interface Part 62: High rate pulse repetition frequency Ultra Wide Band (UWB) air interface BS ISO/IEC 24730
19、-21:2012ISO/IEC 24730-21:2012(E) iv ISO/IEC 2012 All rights reservedIntroduction ISO/IEC 24730-21 defines the physical layer for compliant RTLS transmitters operating with a single spread code and employing a DBPSK data encoding and BPSK spreading scheme. BS ISO/IEC 24730-21:2012INTERNATIONAL STANDA
20、RD ISO/IEC 24730-21:2012(E) ISO/IEC 2012 All rights reserved 1Information technology Real time locating systems (RTLS) Part 21: Direct Sequence Spread Spectrum (DSSS) 2,4 GHz air interface protocol: Transmitters operating with a single spread code and employing a DBPSK data encoding and BPSK spreadi
21、ng scheme 1 Scope ISO/IEC 24730-2 is comprised of a main document and two additional parts and defines a networked location system that provides X-Y coordinates and data telemetry. The system utilizes RTLS transmitters that autonomously generate a direct sequence spread spectrum radio frequency beac
22、on. These devices can be field programmable and support an optional exciter mode that allows modification of the rate of location update and location of the RTLS device. ISO/IEC 24730-2 defines these modes, but does not define the means by which they are accomplished. This part of ISO/IEC 24730 spec
23、ifies transmitters operating with a single spread code and employing a differential binary phase shift keying (DBPSK) data encoding and binary phase shift keying (BPSK) spreading scheme. 2 Normative references The following referenced documents are indispensable for the application of this document.
24、 For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies. ISO/IEC 24730-2:2011, Information technology Real time locating systems (RTLS) Part 2: Direct Sequence Spread Spectrum (DSSS) 2,4 GHz air i
25、nterface protocol ISO/IEC 24730-22:2011, Information technology Real time locating systems (RTLS) Part 22: Direct Sequence Spread Spectrum (DSSS) 2,4 GHz air interface protocol: Transmitters operating with multiple spread codes and employing a QPSK data encoding and Walsh offset QPSK (WOQPSK) spread
26、ing scheme 3 Terms and definitions For the purposes of this document, the terms and definitions provided in ISO/IEC 24730-2 apply. 4 Symbols and abbreviated terms For the purposes of this document, the symbols and abbreviated terms provided in ISO/IEC 24730-2 apply. BS ISO/IEC 24730-21:2012ISO/IEC 2
27、4730-21:2012(E) 2 ISO/IEC 2012 All rights reserved5 Requirements 5.1 Frequency range For the purposes of this document, the frequency range provided in ISO/IEC 24730-2 applies. 5.2 2,4 GHz spread spectrum air interface attributes For the purposes of this document, the 2,4 GHz spread spectrum air int
28、erface attributes provided in ISO/IEC 24730-2 apply. 5.3 Compliance requirements For the purposes of this document, the compliance requirements provided in ISO/IEC 24730-2 apply. 5.4 Manufacturer tag ID For the purposes of this document, the manufacturer tag ID provided in ISO/IEC 24730-2 applies. 5
29、.5 Physical layer parameters The parameter definitions in Table 1 apply. These parameters are referenced by parameter name. These operating parameters are to be defined for the temperature range of 30 degrees Celsius to 50 degrees Celsius. An optional mode is defined for utilization in Japan. This a
30、llows the operation in conformance with local radio regulations in Japan. This mode shall be used for systems that will be operated in Japan. Link parameters for this mode are defined in Table 2a. Table 3 and Table 4 specify the parameters for the optional air interfaces that may be implemented. Tab
31、le 1 RTLS transmitter DSSS link parameters Parameter name Description Operating frequency range 2400 MHz2483,50 MHz Operating frequency accuracy 25 ppm maximum Centre frequency 2441,750 MHz Occupied channel bandwidth 60 MHz Transmit power Class 1: 10 dBm EIRP max. Class 2: Maximum in accordance to l
32、ocal regulations Spurious emission, out of band The device shall transmit in conformance with spurious emissions requirements defined by the countrys regulatory authority within which the system is operated. Modulation BPSK DSSS Data encoding Differentially encoded Data bit rate 59,7 kb/s Bit error
33、rate 0,001% PN chip rate 30,521875 MHz 25 ppm PN code length 511 PN spread code 0x1CB BS ISO/IEC 24730-21:2012ISO/IEC 24730-21:2012(E) ISO/IEC 2012 All rights reserved 3Parameter name Description Data packet lengths Option 1: 56 bits Option 2: 72 bits Option 3: 88 bits Option 4: 152 bits Message CRC
34、 polynomial G(x) = X12+ X11+ X3+ X2+ X + 1 CRC polynomial initialized value 0x001 Blink interval Programmable, 5 s minimum Blink interval randomization 638 ms maximum Number of sub-blinks Programmable, 1 - 8 Sub-blink interval randomization 125 ms 16 ms maximum Maximum frequency drift 2 ppm over the
35、 duration of the entire message Phase accuracy 0,50 radians within any 33 s period Phase noise 15 degrees when the noise is integrated from 100 Hz to 100 kHz Table 2a RTLS transmitter DSSS link parameters for Japan Mode Parameter name Description Operating frequency range 2400 MHz2483,50 MHz Operati
36、ng frequency accuracy 25 ppm maximum Centre frequency 2441,750 MHz Occupied channel bandwidth 26 MHz Transmit power Class 1: 10 dBm EIRP max. Class 2: Maximum in accordance to local regulations Spurious emission, out of band The device shall transmit in conformance with spurious emissions requiremen
37、ts defined by the countrys regulatory authority within which the system is operated. Modulation BPSK DSSS Data encoding Differentially encoded Data bit rate 59,7 kb/s Bit error rate 0,001% PN chip rate 15,260938 MHz 25 ppm PN code length 511 PN spread code 0x8D Data packet lengths Option 1: 56 bits
38、Option 2: 72 bits Option 3: 88 bits Option 4: 152 bits Message CRC polynomial G(x) = X12+ X11+ X3+ X2+ X + 1 CRC polynomial initialized value 0x001 Blink interval Programmable, 5 s minimum Blink interval randomization 638 ms maximum BS ISO/IEC 24730-21:2012ISO/IEC 24730-21:2012(E) 4 ISO/IEC 2012 All
39、 rights reservedParameter name Description Number of sub-blinks Programmable, 1 - 8 Sub-blink interval randomization 125 ms 16 ms maximum Maximum frequency drift 2 ppm over the duration of the entire message Phase accuracy 0,50 radians within any 33 s period Phase noise 15 degrees when the noise is
40、integrated from 100 Hz to 100 kHz Table 3 RTLS transmitter OOK link parameters Parameter Number Parameter Name Description O 1a Carrier frequency 2400 MHz - 2483,5 MHz O 1b Operating frequency accuracy 25 ppm maximum O 1c Centre frequency 2441,750 MHz O 2a Data encoding Differentially encoded O 2b D
41、ata packet lengths Option 1: 88 bits Option 2: 184 bits O 2c Message CRC polynomial G(x) = X16+ X12+ X5+ 1 O 2d CRC polynomial initialized value 0x0001 O 3 Transmit power Class 1: 10 dBm EIRP max. Class 2: Max. per local radio regulations O 4 Transmit spurious emissions, out of band Within local rad
42、io regulations O 5 Modulation OOK/FSK, using 2 tones 376,8 kHz /535,5 kHz O 5a Logic “0” 19 cycles at a 377 kHz rate of 2,44652 GHz on/off O 5b Logic “1” 27 cycles at a 535 kHz rate of 2,44652 GHz on/off O 6 Data rate 19,83 kb/s O 7 Duty cycle 50% O 8 Data error rate 0,001% max. BS ISO/IEC 24730-21:
43、2012ISO/IEC 24730-21:2012(E) ISO/IEC 2012 All rights reserved 5Table 4 RTLS transmitter magnetic link parameters Parameter Number Parameter Name Description M 1 Signalling frequencies 114,688 kHz and 126,976 kHz M 2 Field strength Regulatory/application dependent M 3 Bit data rate 2,048 kb/s M 4 Sym
44、bol period 244,14 ms M 5 Data error rate 0,001% M 6 Start sync. 3 symbol periods 114,688 kHz followed by 3 symbol periods 126,976 kHz M 7 End sync. 3 symbol periods 126,976 kHz followed by 3 symbol periods 114,688 kHz M 8 Data bit 0 1 symbol period 126,976 kHz followed by 1 symbol period 114,688 kHz
45、 M 9 Data bit 1 1 symbol period 114,688 kHz followed by 1 symbol period 126,976 kHz M 10a Programmer packet lengths Option 1: 10 bits Option 2: 48 bits Option 3: 64 bits Option 4: 68 bits Option 5: 144 bits Option 6: 160 bits M 10b Exciter packet lengths Option 1: 10 bits Option 2: 28 bits Option 3:
46、 44 bits Option 4: 144 bits M 11 Data encoding Manchester encoding M 12a Programmer message CRC polynomial G(X) = X12+ X11+ X3+ X2+ X1+ 1 M 12b 28-bit exciter CRC polynomial G(X) = X8+ X4+ X3+ X2+ 1 M 12c 44-bit exciter CRC polynomial G(X) = X12 + X11+ X3+ X2+ X1+ 1 M 12d 10-bit programmer / exciter
47、 CRC polynomial G(X) = X4+ X1+ 1 6 Mandatory air interface protocol specification 6.1 General ISO/IEC 24730-21 defines the 2,400 GHz to 2,4835 GHz RTLS spread-spectrum transmissions and the command/data level air interface communication protocols. These protocols facilitate communication between a c
48、ompliant RTLS transmitter and a compliant infrastructure. The optional protocols in clause 7 facilitate communication between an RTLS transmitter and a programming device and also an exciter device respectively. The timing parameters and signal characteristics for the protocols are defined in the ph
49、ysical link specification in clause 5. BS ISO/IEC 24730-21:2012ISO/IEC 24730-21:2012(E) 6 ISO/IEC 2012 All rights reserved6.2 Introduction Beacon type RTLS system architecture consists of RTLS transmitters that “blink” a Direct Sequence Spread Spectrum (DSSS) signal, and fixed position RTLS readers that receive those signals. The system then determines the x, y location of the RTLS transmitters. Location of tagged assets can be determined
