1、T/R l(M1 E 1 Diskibubon: B Recommendation T/R 10-01 (Oslo 1991, revised in Madrid 1992) WIDE BAND DATA TRANSMISSION SYSTEMS USING SPREAD-SPECTRUM TECHNOLOGY IN THE 2.5 GHz BAND Recommendation proposed by the “Frequency Management“ Working Group 0 Text of the Recommendation adopted by the “European R
2、adiocommunications Committee“ (ERC): INTRODUCTION In 1991 the European Radiocommunications Committee published ERC Report 1 on the harmonisation of frequency bands for Radio Local Area Networks (FUANS). Subsequently it was recognised that it would be preferable to identify the frequency bands to be
3、used for Wide Band Data Transmission Systems such as RLANs before ETSI started to develop the relevant ETSs. In order to enable the rapid deployment of the market a general requirement was identified for a regulatory reghe requiring little or no frequency coordination for individual systems. One pos
4、sibility would be to ammoodate Wide Band Data Transmission Systems in ISM frequency bands. The sharing conditions in most ISM fiequency bands are not ideal due to the use of these bands for other low power devices as well as for ISM applications. Howevex, the methodologies developed for assessing co
5、mpatibility between spread-spectrum and narrow band systems show that satisfactory and reliable operation for Wide Band Data Transmissian Systems is possible in an ISM environment. It is considered that the ISM frequency band 2400-2500 MHz offers the best possibility for meeting this requirement whi
6、ch is the lowest ISM band available in Europe offering sufficient bandwidth whilst still providing sufficient in-building penetration to facilitate cost effective and flexible system applications. However, it is recognised that the future ETSI HiPERL.AN standard, requiring higher data rates, wiil ne
7、cessitate a more predictable sharing environment. Therefore, CEPT is in the process of developing a separate Recommendation for HIPERLANs operating m the 5 GHz range and in the band 17.1-17.3 GHz. The DECT system developed by ETSI also provides RLAN facilities. Edition of March 1,1993 STD-CEPT T/R L
8、O-01 E-ENGL 1993 2326434 0034582 27L T/R 1001 E Page 2 The following Recommendation is therefore agreed by CEPT: The European Conference of Postal and Telecommunications Administrations, considering that (a) CEFT has a long-term objective to harmonise the use of radio frequencies throughout Europe,
9、(b) there is an emerging requirement for Wide Band Data Transmission Systems using radio, thus offering increased flexibility, (c) ETSI will be developing an appropriate standard for such applications, (d) the 2.5 GHz ISM allocation provides the best means of meeting the requirement in terms of spec
10、trum availability, bandwidth and good in-building penetration, (e) there is a general requirement for a regalatory regime which enables the rapid deployment of Wide Band Data Transmission Systems with minimal frequency planning, (0 some countries outside Europe have already designated frequency spec
11、trum in the 915 MHz and 2450 MHz ISM frequency bands for such systems using spread-spectrum technology, (g) the 915 MHz frequency band is designated within CEPT countries for GSM and other mobile radio services in accordance with CEPT Recommendation T/R 75-02 E and is therefore not available for any
12、 Wide Band Data Transmission Systems within CEPT countries, (h) compatibility studies have shown that Wide Band Data Transmission Systems using spread-spectrum technology, due to their low spectral power density and their high immunity against interference, could share with some narrow band radio sy
13、stems, noting that there is also a requirement for RLAN Systems operating in a predictable sharing environment and enabling medium and high capacity data transfer rates with good frequency re-use capability which could be met in frequency bands around 5 GHz and in the band 17.1-17.3 GHz for which ET
14、SI has decided to develop a standard for a “High Performance European Radio LAN (HPERLAN)” and for which CEPT is intendhg to develop a Recommendation m 1992, recommends that 1. the band 2400-2500 MHz be wed on a non-interference and non-protected basis for Wide Band Data Transmission Systems using s
15、pread-spectrum technology with a minimum aggregate bit rate of 250 kbitls. The total power in this frequency range shall not exceed -10 dBW e.i.r.p. For systems using direct sequence spread-spectrum technology, the peak e.i.r.p. spectral density shall not exceed -20 dBW/MHz; for systems using freque
16、ncy hopping spread-spectrum technology, the peak e.i.r.p. shall not exceed -10 dBW measured in a 100 IrHZ bandwidth, 2. Wide Band Data Transmission Systems using spread-spectrum technology have to be type approved according to the ETSI Standard XXX and have to be marked “CEPT-RLAN Y” according to th
17、e Recommendation TIR 7 1-03 E, 3. CEFT Member countries shall not require an individual licence for the use of Wide Band Data Transmission Systems using spread-spectrum technology terminals.” Edition of March 1,1993 Tm 10-01 Wide band data transmission systems using spread-spectrum technology in the
18、 2.5 GHz band Adm Imp1 AUT Yes BEL Yes CZE Yes Remarks I II I I Planned I IRL Ives IROU Ives I II ISL LIE LVA NOR POL POR Yes Yes Planned Yes Planned Yes S SUI SVN TUR Planned Implementation is under consideration Yes Yes Yes 2.9.1997. Regulation on radio licenses, art. 9 (Off.Gaz. of SVN, No. 50197)
