1、 Recommendation ITU-R F.1777-1 (09/2015) System characteristics of television outside broadcast, electronic news gathering and electronic field production in the fixed service for use in sharing studies F Series Fixed service ii Rec. ITU-R F.1777-1 Foreword The role of the Radiocommunication Sector
2、is to ensure the rational, equitable, efficient and economical use of the radio-frequency spectrum by all radiocommunication services, including satellite services, and carry out studies without limit of frequency range on the basis of which Recommendations are adopted. The regulatory and policy fun
3、ctions of the Radiocommunication Sector are performed by World and Regional Radiocommunication Conferences and Radiocommunication Assemblies supported by Study Groups. Policy on Intellectual Property Right (IPR) ITU-R policy on IPR is described in the Common Patent Policy for ITU-T/ITU-R/ISO/IEC ref
4、erenced in Annex 1 of Resolution ITU-R 1. Forms to be used for the submission of patent statements and licensing declarations by patent holders are available from http:/www.itu.int/ITU-R/go/patents/en where the Guidelines for Implementation of the Common Patent Policy for ITU-T/ITU-R/ISO/IEC and the
5、 ITU-R patent information database can also be found. Series of ITU-R Recommendations (Also available online at http:/www.itu.int/publ/R-REC/en) Series Title BO Satellite delivery BR Recording for production, archival and play-out; film for television BS Broadcasting service (sound) BT Broadcasting
6、service (television) F Fixed service M Mobile, radiodetermination, amateur and related satellite services P Radiowave propagation RA Radio astronomy RS Remote sensing systems S Fixed-satellite service SA Space applications and meteorology SF Frequency sharing and coordination between fixed-satellite
7、 and fixed service systems SM Spectrum management SNG Satellite news gathering TF Time signals and frequency standards emissions V Vocabulary and related subjects Note: This ITU-R Recommendation was approved in English under the procedure detailed in Resolution ITU-R 1. Electronic Publication Geneva
8、, 2015 ITU 2015 All rights reserved. No part of this publication may be reproduced, by any means whatsoever, without written permission of ITU. Rec. ITU-R F.1777-1 1 RECOMMENDATION ITU-R F.1777-1* System characteristics of television outside broadcast, electronic news gathering and electronic field
9、production in the fixed service for use in sharing studies (Question ITU-R 252/5) (2007-2015) Scope This Recommendation, dealing with system characteristics of television outside broadcast (TVOB), electronic news gathering (ENG) and electronic field production (EFP) in the fixed service for use in s
10、haring studies contains the typical system parameters and operational requirements for these broadcast auxiliary services (BAS)1, which are required for sharing studies between the analogue and digital BAS in the fixed service and other radiocommunication services. Keywords Electronic news gathering
11、 (ENG), system characteristics The ITU Radiocommunication Assembly, considering a) that some administrations operate extensive terrestrial broadcast auxiliary services (BAS) under fixed service (FS) allocations; b) that administrations who operate analogue terrestrial BAS under FS allocations are li
12、kely to continue for a reasonable amount of time into the future; c) that some administrations are migrating from analogue to digital terrestrial BAS under FS allocations; d) that many administrations are likely to operate both terrestrial analogue and digital electronic news gathering (ENG) and tel
13、evision outside broadcast (TVOB) equipment under FS allocations for a reasonable amount of time in the future; e) that the frequency bands used for these BAS including TVOB, ENG and electronic field production (EFP) are, in many cases, shared by the FS and other services; f) that system characterist
14、ics for BAS including TVOB, ENG and EFP are different from those of typical fixed wireless systems (FWSs) as originally found in Recommendation ITU-R F.758; g) that it is desirable to identify the system parameters and operational characteristics for BAS applications including TVOB, ENG and EFP for
15、efficient sharing studies with other services, noting a) Report ITU-R BT.2069 Tuning range and operational characteristics of terrestrial electronic news gathering systems (ENG), provides specifications on TVOB, ENG and EFP; * This Recommendation should be brought to the attention of Radiocommunicat
16、ion Study Group 6. 1 The term “BAS” also known as services ancillary to broadcasting (SAB) is defined in Report ITU-R BT.2069. 2 Rec. ITU-R F.1777-1 b) Recommendation ITU-R M.1824 System characteristics of television outside broadcast, electronic news gathering and electronic field production in the
17、 mobile service for use in sharing studies; c) that as digital terrestrial BAS is the more sensitive service, successful sharing studies conducted with digital BAS assume that analogue BAS will be protected, recommends 1 that the description of the user requirements and key characteristics of analog
18、ue and digital terrestrial BAS in Annexes 1 and 2 be used by administrations seeking to operate these applications in the frequency bands allocated to the FS sharing with other services; 2 that the parameters described in Annex 2 should be used for sharing studies between digital BAS and other servi
19、ces; 3 that, for typical sharing considerations including development of criteria for these applications, the basic principles provided in Recommendation ITU-R F.758 should be used. Annex 1 System characteristics and user requirements for BASs including TVOB, ENG and EFP 1 Overview Certain bands all
20、ocated to the FS are used for fixed wireless links to provide BASs which are “contribution” links (i.e. an input to the broadcast studio) usually operated by television broadcasters and vital for the production of various television programmes. These services are commonly known as: Television outsid
21、e broadcast (TVOB): a planned use of group links using a variety of techniques to provide specialist coverage of an event. Electronic news gathering (ENG): the rapid, unplanned deployment of links to cover breaking news events, generally for short periods of time. Electronic field production (EFP):
22、a planned use of links to provide elements of a television production, can be “live” to air or recorded for later broadcast, generally with more elaborate television production values. The later sections in this Annex provide basic descriptions for these applications within the scope of this Recomme
23、ndation. For more detailed information, Report ITU-R BT.2069 could be referenced. 1.1 TVOB Operations for TVOB can range across a number of events which may include live entertainment, sports and other events of national or worldwide importance. TVOB involves the transmission of events back to a stu
24、dio facility for inclusion as programme material. TVOB operations are generally planned (e.g. sports broadcasts, concerts) multicamera live-to-air events. Such events may take place almost anywhere, but typically take place in urban Rec. ITU-R F.1777-1 3 area venues. Television broadcasters operate
25、multiple OB trucks with TVOB links, in addition to typical fixed links, in locations of high-population density and locations where TVOB events are frequently scheduled. The TVOB point-to-point (P-P) links generally involve the use of directional antennas (e.g. parabolic) and relatively low elevatio
26、n angles. Operational duration ranges from a few minutes up to several days, depending upon the type of event and its timing. In many cities, TVOB collection sites in the bands assigned for them are often mounted on the broadcast tower facilities located near the edge of the urban area. 1.2 ENG Oper
27、ational requirements for ENG include fixed, nomadic and mobile applications ranging from stationary reporting by journalists, mobile camera coverage of scenes of regional and world conflict to aerial coverage of natural disasters. Much news gathering takes place in the central business districts of
28、major cities, including sites close to major airports through to rural areas. ENG operations often involve the setting up of an unplanned P-P link or series of links. For daily news gathering in major city areas, broadcast network operators have utilized fixed collection sites operating in a number
29、of bands for analogue or digital ENG. ENG transmissions are consolidated from multiple nomadic operations over a large (up to 100 km radius) area. ENG collection sites are operated, in most cases, by TV networks in major city areas where the typical central collection site is located within the city
30、 centre, on the roof of a high building (e.g. 150 m above the surrounding terrain), including a range of steerable (e.g. parabolic dish) and fixed (e.g. panel arrays with 360 of azimuthal coverage). Many TV networks often have an alternative dedicated ENG collection site mounted on their broadcast t
31、ransmission tower. In most cities these are located near the edge of the urban area. 1.3 EFP As an extension of a television studio production, EFP is planned and requires higher production values that dictate a higher quality level in the video link performance. EFP operations are facilitated throu
32、gh the use of radio cameras, affording the operator with additional flexibility and avoiding the need for troublesome cables. Radio cameras relay programme material from portable cameras (e.g. as carried by a field cameraman) to a transportable or fixed receiving point, typically with path lengths o
33、f up to a couple of hundred metres. Typically, radio cameras operate at lower power levels and low gain omnidirectional transmitting antennas are used. Radio camera operation tends to be limited by battery life with operations lasting up to one hour in duration. Many other characteristics, however,
34、are similar to ENG, including use of the collection sites. 2 Specific operational characteristics affecting sharing considerations BAS including TVOB, ENG and EFP are used in a number of configurations and operational locations. Therefore, they are not characterized with operational characteristics
35、typical to general FS systems, and this has led to separate considerations in ensuring frequency sharing with various services operating in the same bands. Currently the operation of BAS may be likened to “nomadic” applications. By their very nature, BAS links are not planned in the same manner as o
36、ther fixed links as they are deployed in response to breaking news events or to follow action of a sporting event. The BAS service could be likened to a broadcaster toolkit (including a variety of transmitters, antennas and 4 Rec. ITU-R F.1777-1 receivers) used in a spectrum toolbox. The tools are c
37、hosen on an as-needed basis to cover a particular event. Whilst a BAS operator will predominantly operate within the bounds of their home administration, globalization of news and sport often requires them to temporarily relocate their equipment to operate within other administrations. The operation
38、al deployment characteristics of BAS are typically listed as follows: Geographic spread of operations: Fixed collection sites located near city centres of major and capital cities. Nomadic news collection and sporting events principally around the major city and urban areas, but potentially anywhere
39、 where news events occur. EFP and TVOB operations located on an event-by-event basis. Link densities: Major TV networks operate TVOB/ENG collection sites in major cities. For ENG operations news crews perform between one to five ENG collection operations per day, each of between half an hour up to a
40、 one-hour duration per broadcaster. The very nature of competitive news broadcasting creates peak usage times where all channels are operated simultaneously. Operational times/duration: TVOB/ENG collection sites operate continuously, picking up program material from nomadic news teams using mobile a
41、nd transportable ENG equipment. Events take place at any time of the day, with fewer events taking place at night, between about 2 400 h and 0400 h. ENG collections have been typically between about 1/2 h to 1 h in duration, with special event collections involving durations of between 2 to 5 h. On
42、occasions some operations have extended over days or even weeks. EFP operations tend to be between 3 and 8 h. With the introduction of digital ENG technology, the different functionality of digital systems have permitted broadcasters more flexibility to cover an increased number of events within the
43、 bandwidth assigned to BAS. 3 Equipment characteristics BAS operations involve a variety of equipment including transmitters mounted on the back of cameras and in other specialized applications such as temporary fixed links and vehicle mounted links. Likewise a variety of receivers are deployed to s
44、uit the situation. These range from a small antenna deployed at a BAS collection site for reception of camera-back transmitters to a central receiving site. 3.1 Central receiving sites Analogue TVOB/ENG operations have utilized a variety of antennas, including parabolic dish and co-linear with ENG c
45、ollection receiving stations typically using medium-gain horn arrays with terrestrial coverage over the full azimuth range. The characteristics of analogue FM modulated video signals dictated that only one antenna could be used into one receiver at a time. Digital technology allows numerous antennas
46、 to be connected in an array to a diversity receiver which selects the optimum signal automatically at any instant in time. The antenna types may be a mixture of steerable (e.g. parabolic dish), fixed panel arrays with up to 360 of azimuthal coverage. Additionally, diversity reception techniques are
47、 employed between collection sites to feed one “master” decoder and hence provide continuous coverage over a wider area. Now digital ENG systems have moved to a cellular-type of operation whereby a network of collection sites provides coverage over the wanted service area. Rec. ITU-R F.1777-1 5 3.2
48、Operational requirements of BAS equipment The design of BAS systems including TVOB, ENG and EFP has the following requirements (see Note 1): The transmission equipment must be robust and suitable for mounting in mobile vehicles. The transmitter must be capable of speedy set-up, allowing relatively u
49、nskilled staff to arrive at a news event and commence broadcasting very quickly. The entire system must be expandable to allow the number of stations using the repeater simultaneously, the number of local encoders at the repeater site or the number of repeater sites to be increased. The quality and robustness of the microwave link must be sufficient to allow reliable, broadcast quality transmissions to be received from almost anywhere within the broadcasters defined service region. The transmission frequency must be selectable to enable avoidance of congestion that may be
