1、ETSI EN 300 47 1-1 VI .Z.I (2001-05) European Standard (Telecommunications series) Electromagnetic com pati bi I ity and Radio spectrum Matters (ERM); Land Mobile Service; Rules for Access and the Sharing of common used channels by equipment complying with EN 300 113; Part 1 : Technical characterist
2、ics and methods of measurement 2 ETSI EN 300 471-1 V1.2.1 (2001-05) Th Reference REN/ERM-RP02-049-1 Keywords EMC, mobile, PMR, radio, service ETSI 650 Route des Lucioles F-O6921 Sophia Antipolis Cedex - FRANCE Tel.: +33 4 92 94 42 O0 Fax: +33 4 93 65 47 16 Siret No 348 623 562 O0017 - NAF 742 C Asso
3、ciation but non lucratif enregistre la Sous-prfecture de Grasse (06) No 7803/88 Important notice Individual copies of the present document can be downloaded from: hfl:/www.etsi. orq my cas present document may be made available in more than one electronic version or in print. I Df existing or percei
4、ved difference in contents between such versions, the reference version is the Portable Document Format (PDF). In case of dispute, the reference shall be the printing on ETSI printers of the PDF version kept on a specific network drive within ETSI Secretariat. Users of the present document should be
5、 aware that the document may be subject to revision or change of status. Information on the current status of this and other ETSI documents is available at If you find errors in the present document, send your comment to: ed itoretsi .fr Copyright Notification No part may be reproduced except as aut
6、horized by written permission. The copyright and the foregoing restriction extend to reproduction in all media. O European Telecommunications Standards Institute 2001. All rights reserved. ETSI 3 ETSI EN 300 471-1 V1.2.1 (2001-05) Contents Intellectual Property Rights 5 Foreword 5 Introduction 5 1 2
7、 3 4 4.1 4.2 4.3 4.4 5 6 6.1 6.2 6.3 6.4 6.5 6.6 6.7 6.7.1 6.7.2 7 8 8.1 8.1.1 8.1.2 8.1.3 8.2 8.2.1 8.2.2 8.2.3 9 Scope 6 References 6 De finit ions 7 General . 7 Sharing speech/data . 7 Sharing data/data . 7 Conformity to this EN . 8 Interpretation of the measurement results . 8 Technical characte
8、ristics of the equipment 8 Access protocol 8 General . 8 Principles 9 Procedure 9 Carrier sensing 10 Observation time . 10 Initiation of the transmitter 11 Duration of the RF channel occupation (time interval) 11 Transmissions of data packets exceeding 300 ms 11 Transmissions of data packets not exc
9、eeding 300 ms (speecwdata channels) . 11 Examples of sharing situations 11 Methods of measurement for receiver delays . 16 Carrier sense delay 16 Definition 16 Method of measurement . 16 Limit . 17 Receiver opening delay 17 Definition 17 Method of measurement . 17 Limit . 18 Measurement uncertainty
10、18 Annex A (normative): General arrangements for measurements involving the use of radiated fields . 19 A . 1 Test fixture . 19 A . 1.1 Description 19 A.1.2 Calibration 20 A.1.3 Mode ofuse 20 A.2 Acoustic coupler . 20 A.2.1 General . 20 A.2.3 Calibration 21 A.2.2 Description 21 ETSI 4 ETSI EN 300 47
11、1-1 V1.2.1 (2001-05) Annex B (informative): Comments concerning the random part of the observation time . 22 Annex C (informative): Comments concerning the traffic loading of shared channels 23 Annex D (informative): Bibliography . 24 History . 25 ETSI 5 ETSI EN 300 471-1 V1.2.1 (2001-05) Intellectu
12、al Property Rights IPRs essential or potentially essential to the present document may have been declared to ETSI. The information pertaining to these essential IPRs, if any, is publicly available for ETSI members and non-members, and can be found in ETSI SR O00 3 14: “Intellectual Property Rights (
13、IPRs); Essential, or potentially Essential, IPRs notjed to ETSI in respect of ETSI standards I, which is available from the ETSI Secretariat. Latest updates are available on the ETSI Web server (litt:/wvw.etsi ordj r). Pursuant to the ETSI IPR Policy, no investigation, including IPR searches, has be
14、en carried out by ETSI. No guarantee can be given as to the existence of other IPRs not referenced in ETSI SR O00 3 14 (or the updates on the ETSI Web server) which are, or may be, or may become, essential to the present document. Foreword This European Standard (Telecommunications series) has been
15、produced by ETSI Technical Committee Electromagnetic compatibility and Radio spectrum Matters (EM). The present document is part 1 of a multi-part deliverable covering the Land Mobile Service; Rules for Access and the Sharing of common used channels by equipment complying with 300 113, as identified
16、 below: Part 1: Part 2: “Technical characteristics and methods of measurement“; “Harmonized EN covering essential requirements under article 3.2 of the R it also contains two methods of measurement used for the assessment of receiver timing parameters (characteristics required for the implementation
17、 of the protocol). This access protocol may be used for data communications over channels originally intended for speech use. This access protocol also permits the sharing of a channel between several independent users of data communications. More precisely, this access protocol applies to single fr
18、equency simplex operation (and two frequency repeater operations with the repeater in duplex mode and the mobile units in simplex mode). This access protocol is applicable for: - multiple data only users, independent of each other, which do not share a common central control facility, but may share
19、a common single or two frequency radio channel; multiple mixed analogue speech and data users, independent from each other, which do not share a common central control facility, but may share a common single, or two frequency, radio channel and where speech is to have priority over data transmission
20、s. - In the case of analogue transmissions, the corresponding access protocol is known as the “radio-discipline“ of the users. The present document gives freedom for the use of any bit rate, any constant envelope modulation or any type of communications protocol which fulfils the normative parameter
21、s provided by the present document, in order to access a shared radio channel; within the limits set out in the present document, each group of users may use its own communication protocol. This access protocol is not applicable for data users with common central control facilities or for trunked sy
22、stems operating on dedicated non-shared channels. 2 Re fe re nces The following documents contain provisions which, through reference in this text, constitute provisions of the present document. References are either specific (identified by date of publication andor edition number or version number)
23、 or non-specific. For a specific reference, subsequent revisions do not apply. For a non-specific reference, the latest version applies. il ETSI EN 300 113-1 (V1.3.1): “Electromagnetic compatibility and Radio spectrum Matters (EM); Land mobile service; Radio equipment intended for the transmission o
24、f data (and speech) and having an antenna connector; Part 1: Technical characteristics and methods of measurement“. Pl ETSI EN 300 390-1 (V1.2.1): “Electromagnetic compatibility and Radio spectrum Matters (EM); Land Mobile Service; Radio equipment intended for the transmission of data (and speech) a
25、nd using an integral antenna; Part 1 : Technical characteristics and test conditions“. ETSI I-ETS 300 113 (1992): “Radio Equipment and Systems (RES); Land mobile service Technical characteristics and test conditions for non-speech and combined analogue speechhon-speech equipment with an internal or
26、external antenna connector, intended for the transmission of data“. 31 41 ETSI ETR 028 (1994): “Radio Equipment and Systems (RES); Uncertainties in the measurement of mobile radio equipment characteristics“. ETSI 7 ETSI EN 300 471-1 V1.2.1 (2001-05) 3 Definitions For the purpose of the present docum
27、ent, the following terms and definitions apply: bit: binary digit block: the smallest quantity of information sent over the radio channel. A constant number of useful bits are always sent together with the corresponding redundancy bits. packet: one block or a contiguous stream of blocks sent by one
28、(logical) transmitter to one particular receiver or one particular group of receivers burst (physical): transmission of a small number of consecutive packets within a period not exceeding 300 ms in accordance with this access protocol transmission (physical): one or several packets transmitted betwe
29、en power on and power off of a particular transmitter window: set of inter-related transmissions resulting from the action of the “initiating transmitter“, and limited in time by the access protocol and corresponding occupation rules to a duration of tt + Att. session: set of inter-related exchanges
30、 of packets occupying one or several windows or parts thereof (if applicable). It corresponds to a complete interactive procedure for interchanging data between users, comprising initiation, data transmission and termination procedures. The session can be short (e.g. 2 packets) or long (e.g. one ful
31、l page of text). message: user data to be transferred in one or more packets in a session initiating transmitter: the initiating transmitter is the station that has completed the “observation time“ (see clause 6.5) and therefore starts a transmission. This initiates a window and triggers the timer t
32、t. reply: transmission by a station as an answer to the “initiating transmitter“. This reply can be an acknowledge (“ACK“) or a negative acknowledge (“NACK“) or a longer packet of useful information. 4 4.1 General Sharing speech/data This access protocol gives speech priority over data on mixed spee
33、ch/data channels. In order to limit annoyance to speech users, the duration of data transmissions shall be limited in accordance with clause 6.7. 4.2 Sharing data/data On frequencies assigned only to data communication users (without common central control facilities) the access protocol provides ac
34、cess to independent users with equal priority. ETSI 8 ETSI EN 300 471-1 V1.2.1 (2001-05) 4.3 Conformity to this EN a) A signed declaration shall be provided as a confirmation that the equipment meets the requirements of this access protocol. b) This may be submitted by the manufacturer with the appl
35、ication form for tests. c) In the case where the controlling software for the equipment has not been engineered by the manufacturer of the radio equipment, the party responsible for engineering the controlling software shall provide a signed declaration that the equipment meets the requirements of t
36、his access protocol. d) Measurements of receiver carrier sense delay and opening delay shall be performed, possibly together with the tests corresponding to EN 300 113 (or EN 300 390). 4.4 Interpretation of the measurement results The interpretation of the results (e.g. results recorded in a test re
37、port) for the measurements described in the present document shall be as follows: - the measured value related to the corresponding limit shall be used to decide whether an equipment meets the requirements for that parameter of the present document; the value of the measurement uncertainty shall be,
38、 for each measurement, equal to or lower than the figures given in clause 9 (maximum acceptable values of the measurement uncertainties); the value of the measurement uncertainty for the measurement of each parameter shall be included in the corresponding test report (if any). - - For the test metho
39、ds, according to the present document, the measurement uncertainty figures shall be calculated in accordance with ETR 028 4 and shall correspond to an expansion factor (coverage factor) k = 1,96 or k = 2 (which provide confidence levels of respectively 95 % and 95,45 % in the case where the distribu
40、tions characterising the actual measurement uncertainties are normal (Gaussian). The particular expansion factor used for the evaluation of the measurement uncertainty shall be stated. 5 Technical characteristics of the equipment The timing requirements that the equipment shall fulfil in order to op
41、erate correctly and efficiently can be found in EN 300 113-1 i, clauses 5.1.7 and 5.1.8, EN 300 390-1 2, clauses 5.1.5 and 5.1.6 and clauses 8.1.3 and 8.2.3 ofthe present document. The corresponding methods of measurement can be found in EN 300 113-1 i, clauses 8.8 and 8.9, EN 300 390-1 2, clauses 8
42、.5 and 8.6 and in clauses 8.1 and 8.2, of the present document. 6 6.1 Access protocol General The access protocol shall be used for each occupation of the Radio Frequency (RF) channel for sharing datddata and for sharing speech/data with automatic channel access. ETSI 9 ETSI EN 300 471-1 V1.2.1 (200
43、1-05) 6.2 Principles The equipment determines whether or not the channel is, and has been, idle for a certain period (the observation time) by means of carrier sensing. The observation time consists of a fixed part and a randomly selected part. When the channel still appears to be idle at the end of
44、 the observation time, the transmitter is initiated and powered up within a specified time. The duration of the emission is limited (see clause 6.7). 6.3 Procedure The equipment shall determine whether or not the channel is, and has been, idle for a certain period (the observation time to), by means
45、 of carrier sensing (see clause 6.4). The observation time t, consists of a fixed part tf and a randomly selected Part tr. If the channel is occupied during part of the observation time, the process shall be repeated without changing m (see clause 6.5). If the channel appears to be idle throughout t
46、he observation time, the transmitter shall be initiated and powered up within the specified time (attack time; see EN 300 113-1 i, clause 8.8 or EN 300 390-1 2, clause 8.5). The channel can then be seized for the duration of one time interval. The maximum length tt of this interval depends on the fr
47、equency sharing category (datahpeech, data/data). If a re transmission is required (due, for example, to a “collision“, i.e. a simultaneous channel access by several users), the observation process shall be repeated and the channel shall be detected as idle prior to a repetition of a transmission. W
48、ithin one time interval, the following radio traffic may take place: a) from a base station to one or several mobiles; b) from a mobile to a base station; c) between mobiles. To ensure that no other user can access the channel during a time interval, the reversion time t, the time between transmissi
49、on of a message and reception of the corresponding acknowledgement and/or reply, shall not exceed 50 ms. The reversion time t, is the time between the switch off of one transmitter and the switch on of the other. The points of switch off and switch on are considered to be the points at which the transmitter power is 50 % of the rated carrier power. ETSI 10 Band 30 MHz to 137 MHz ETSI EN 300 471-1 V1.2.1 (2001-05) Threshold level in dBpV emf 12 6.4 z 137 MHz to 300 MHz Carrier sensing 6 Carrier sensing is the detection of whether the RF level in the receive ch
