ITU-R F 1103-1-2007 Basic requirements and technologies for fixed wireless access systems operating in bands below 3 GHz for the provision of wireless subscriber connections in rur.pdf
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1、 Rec. ITU-R F.1103-1 1 RECOMMENDATION ITU-R F.1103-1*Basic requirements and technologies for fixed wireless access systems operating in bands below 3 GHz for the provision of wireless subscriber connections in rural areas (Question ITU-R 125/9) (1994-2007) Scope This Recommendation provides basic re
2、quirements and technologies for fixed wireless access (FWA) systems operating in bands below 3 GHz for use for wireless connections in rural areas. The requirements include service aspects as well as performance/availability objectives. The Annexes describe technical and operational information spec
3、ifically required for FWA applications used in rural areas. Vocabulary RCS Radio Concentrator System A wireless system in which the radio resource (e.g. a time slot in the time domain or a frequency channel in the frequency domain) is commonly used by more than one subscriber by applying a multiple
4、access technique. Abbreviations ADPCM Adaptive differential pulse code modulation CDMA Code division multiple access E b) that the equipment for such links should be simple and reliable for reduction of establishment costs, and for ease of maintenance and operation; c) that in the provision of such
5、links, the calling rate allows the use of such methods as fixed wireless access (FWA) systems using point-to-multipoint (P-MP) applications; d) that FWA systems operating in bands below 3 GHz are suitable for the provision of such links and it is necessary to provide technical information on these s
6、ystems for the system designers; e) that in rural areas it is often difficult to implement metallic lines or other cable systems economically, however various telecommunication services provided by metallic lines or other cable systems should, as far as possible, be available also in rural areas; f)
7、 that Recommendation ITU-R F.1490 specifies generic requirements for FWA systems; g) that Recommendation ITU-R F.757 provides basic system requirements and performance objectives for FWA systems using mobile-derived technologies offering telephony and data communication services, recommends 1 that F
8、WA systems used for rural subscriber links should provide services also available by metallic lines. These services may include: 2-wire individual telephone service; payphone service of various kinds; 4-wire service with and without E the capability to carry voiceband data including facsimile and ot
9、her telematic services up to a bit rate of at least 9.6 kbit/s; 2 that, in many cases, the above FWA systems should: carry data at rates up to and including 64 kbit/s; provide, integrated services digital network (ISDN) basic rate access, 2B+D; 3 that giving due regard to economical considerations:
10、3.1 the grade of service (lost call probability) offered by such a system to a subscriber should not normally be worse than 1% and should be calculated employing ITU-T E-series Recommendations (e.g. E.506 and E.541) (see Note 1); 3.2 the error performance and availability objectives should be in acc
11、ordance with Recommendations ITU-R F.697 and ITU-R F.1400; 4 that for the effective use of frequency spectrum, radio concentrators and other digital multiple access techniques are preferred and for detailed technical information on TDMA P-MP systems Annex 1 be referred to (see Note 2); 5 that for eq
12、uipment general characteristics and operational environments, information contained in Annex 2 be referred to as a guide for administrations and system designers; 6 that voice encoding methods employed in digital systems be such that the integration of the system into the switched network is straigh
13、tforward and introduces as few limitations as possible. Rec. ITU-R F.1103-1 3 Recommended encoding methods are 64 kbit/s PCM and 32 kbit/s ADPCM in accordance with ITU-T Recommendations G.711 and G.726, respectively. NOTE 1 Some administrations may adopt other values for the grade of service, e.g. a
14、s much as 5%, depending on local conditions. NOTE 2 Other technologies such as CDMA and orthogonal frequency division multiplex (OFDM) can be found in the Fixed Wireless Access Handbook (Volume 1 of the Land Mobile Handbook). References ITU-R Recommendations Recommendation ITU-R F.382 Radio-frequenc
15、y channel arrangements for fixed wireless systems operating in the 2 and 4 GHz bands Recommendation ITU-R F.697 Error performance and availability objectives for the local-grade portion at each end of an ISDN connection at a bit rate below the primary rate utilizing digital radio-relay systems Recom
16、mendation ITU-R F.701 Radio-frequency channel arrangements for point-to-multipoint radio systems operating in frequency bands in the range 1.350 to 2.690 GHz (1.5, 1.8, 2.0, 2.2, 2.4 and 2.6 GHz) Recommendation ITU-R F.746 Radio-frequency arrangements for fixed service systems Recommendation ITU-R F
17、.757 Basic system requirements and performance objectives for fixed wireless access using mobile-derived technologies offering telephony and data communication services Recommendation ITU-R F.1242 Radio-frequency channel arrangements for digital radio systems operating in the range 1 350 MHz to 1 53
18、0 MHz Recommendation ITU-R F.1243 Radio-frequency channel arrangements for digital radio systems operating in the range 2 290-2 670 MHz Recommendation ITU-R F.1400 Performance and availability requirements and objectives for fixed wireless access to public switched telephone network Recommendation I
19、TU-R F.1401 Considerations for the identification of possible frequency bands for fixed wireless access and related sharing studies ITU-T Recommendations ITU-T Recommendation E.506: Forecasting international traffic ITU-T Recommendation E.541: Overall grade of service for international connections (
20、subscriber-to-subscriber) ITU-T Recommendation G.711: Pulse code modulation (PCM) of voice frequencies ITU-T Recommendation G.726: 40, 32, 24, 16 kbit/s Adaptive Differential Pulse Code Modulation (ADPCM) 4 Rec. ITU-R F.1103-1 Annex 1 General characteristics of fixed wireless access systems using TD
21、MA techniques 1 Introduction This Annex provides information on P-MP FWA systems using TDMA. Such systems can also generally operate in a non-concentrating mode such as for pre-assigned low capacity data links. These systems are now widely used to provide a subscriber voice data service primarily in
22、 rural/suburban areas and less frequently in urban locations. 2 General description The basic purpose of these systems is to provide a radio link that will extend services to rural subscribers where cable systems are more costly or severely restricted by terrain or to protect environments. As far as
23、 practicable these services should provide a transmission quality and range of facilities that are normally provided to subscribers in urban areas. Multiple access systems give subscribers access to several circuits, the number n of which is smaller than the number N of subscribers (n N). As this is
24、 a concentrator system, a certain grade of service in respect of attempts to set up calls must be accepted. The grade of service depends on the number n of circuits, the number N of subscribers and the traffic that is originated. A TDMA radio concentrator system (TDMA-RCS) consists of a single trans
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