1、INTERNATIONAL TELECOMMUNICATION UNION ITU=T TELECOMMUNICATION STANDARDIZATION SECTOR OF ITU 5.114 (09/99) SERIES J: TRANSMISSION OF TELEVISION, SOUND PROGRAMME AND OTHER MULTIMEDIA SIGNALS Interactive systems for digital television distribution Interaction channel using digital enhanced cordless tel
2、ecommunications ITU-T Recommendation J.114 (Previously CCITT Recommendation) ITU-T J-SERIES RECOMMENDATIONS TRANSMISSION OF TELEVISION, SOUND PROGRAMME AND OTHER MULTIMEDIA SIGNALS General Recommendations General specifications for analogue sound-programme transmission Performance characteristics of
3、 analogue sound-programme circuits Equipment and lines used for analogue sound-programme circuits Digital encoders for analogue sound-programme signals Digital transmission of sound-programme signals Circuits for analogue television transmission Analogue television transmission over metallic lines a
4、nd interconnection with radio-relay links Digitai transmission of television signals Ancillary digital services for television transmission Operational requirements and methods for television transmission Inteirrctlvo: systeiar for digitai teevlsion istribuon Transport of WEG-2 signals on packetised
5、 networks Measurement of the quality of service Digital television distribution through local subscriber networks J.1-J.9 J. 10-J. 19 5.20-J.29 J.30-J.39 J .40-J .49 J.50-J.59 5.60-5.69 5.70-5.79 5.80-1.89 J.90-J.99 J. 100-J. 109 J.ll(M.129 J.130-J.139 J.140-J. 149 5.150-J.159 Forjrther detaih, plea
6、se refer to ITU-T List of Recommendations. ITU-T RECOMMENDATION 5.114 INTERACTION CHANNEL USING DIGITAL ENHANCED CORDLESS TELECOMMUNICATIONS Summary This Recommendation is the baseline specification for the provision of an interaction channel using the Digital Enhanced Cordless Telecommunications (D
7、ECT) Standard in conjunction with a digital broadcasting delivery medium. It is suitable for use with any broadcast transmission medium, such as cable, satellite, terrestrial, etc., thus ensuring the maximum degree of interoperability and economies of scale. Source IT-T Recommendation J.114 was prep
8、ared by ITU-T Study Group 9 (1997-2000) and was approved under the WTSC Resolution No. 1 procedure on 16 September 1999. Recommendation 5.114 (09/99) i - FOREWORD ITU (International Telecommunication Union) is the United Nations Specialized Agency in the field of telecommuni- cations. The ITU Teleco
9、mmunication Standardization Sector (ITU-T) is a permanent organ of the ITU. The ITU-T is responsible for studying technical, operating and tariff questions and issuing Recommendations on them with a view to standardizing telecommunications on a worldwide basis. The World Telecommunication Standardiz
10、ation Conference (WTSC), which meets every four years, establishes the topics for study by the ITU-T Study Groups which, in their turn, produce Recommendations on these topics. The approval of Recommendations by the Members of the ITU-T is covered by the procedure laid down in WTSC i Resolution No.
11、1. In some areas of information technology which fall within ITU-Ts purview, the necessary standards are prepared on a collaborative basis with IS0 and IEC. NOTE In this Recommendation, the expression “Administration“ is used for conciseness to indicate both a telecommunication administration and a
12、recognized operating agency. INTELLECTUAL PROPERTY RIGHTS The ITU draws attention to the possibility that the practice or implementation of this Recommendation may involve the use of a claimed Intellectual Property Right. The ITU takes no position concerning the evidence, validity or applicability o
13、f claimed Intellectual Property Rights, whether asserted by ITU members or others outside of the Recommendation development process. As of the date of approval of this Recommendation, the ITU had not received notice of intellectual property, protected by patents, which may be required to implement t
14、his Recommendation. However, implementors are cautioned that this may not represent the latest information and are therefore strongly urged to consult the TSB patent database. O ITU 2000 All rights reserved. No part of this publication may be reproduced or utilized in any form or by any means, elect
15、ronic or mechanical, including photocopying and microfilm, without permission in writing from the ITU. 11 Recommendation J.114 (09/99) CONTENTS Scope References 2.1 Normative references 2.2 Informative references Abbreviations Reference model . 4.1 Protocol stack model . 4.2 System model DVB interac
16、tion channel specification for DECT 5.1 System architecture . 5.2 Physical interfaces . 5.3 Calling procedures 5.4 DECT profiles . 5.5 Forced disconnection Appendix I . Basic characteristics of DECT . 1.1 DECT introduction . 1.2 DECT standard 1.3 Profiles 1.4 Wireless Relay Station (WRS) 1.5 DECT Au
17、thentication Module (DAM) . Appendix II - DECT implementation alternatives . Page 1 1 1 1 2 3 3 4 4 5 5 5 5 7 7 7 8 11 14 14 15 . 111 Recommendation 5.114 (0999) - STD-ITU-T RECMN J-LL4-ENGL 1799 - 48b2571 Ob74393 T77 = Introduction This Recommendation, for the use of the DECT system to provide an i
18、nteraction channel for a digital broadcasting service, is not transmission medium specific. It can be used with any of the broadcast transmission media currently standardized by the IT. It is consistent with the generic reference model described in Recommendation J.110, and the network independent p
19、rotocols in Recommendation J. 1 1 1. iv Recommendation 5.114 (09/99) Recommendation J.114 INTERACTION CHANNEL USING DIGITAL ENHANCED CORDLESS TELECOMMUNICATIONS (Geneva, 1999) 1 Scope This Recommendation is the baseline specification for the provision of an interaction channel based on the Digital E
20、nhanced Cordless Telecommunications (DECT) to Digital Video Broadcasting (DW) systems. This Recommendation does not intend to specie an interaction channel solution associated to each broadcast system because the interoperability of different delivery media to transport the interaction channel is de
21、sirable. Therefore, the DECT solution for the interaction channel applies to satellite, cable, MATV, Satellite Master Antenna Television (SMATV), terrestrial, microwave or any future DVB broadcasting or distribution system. The solutions provided in this Recommendation for an interaction channel thr
22、ough the DECT are a part of a wider set of alternatives to implement interactive services for DVB systems. 2 References The following IT-T Recommendations and other references contain provisions which, through reference in this text, constitute provisions of this Recommendation. At the time of publi
23、cation, the editions indicated were valid. All Recommendations and other references are subject to revision; all users of this Recommendation are therefore encouraged to investigate the possibility of applying the most recent edition of the Recommendations and other references listed below. A list o
24、f the currently valid ITU-T Recommendations is regularly published. 2.1 111 121 131 141 51 161 2.2 71 Normative references ITU-T Recommendation J.110 (1997), Basic principles for a worldwide common family of systems for the provision of interactive television services. ITU-T Recommendation J.111 (19
25、98), Network independentprotocols for interactive systems. EN 50201: 1998, Interfaces for DVB-IRD, CENELEC. ETS 300 765-2 (1998), Digital Enhanced Cordless Telecommunications (DECT); Radio in the Local Loop (EL) Access Profile (RAP); Part 2: Advanced telephony services. EN 301 240 (1998), Digital En
26、hanced Cordless Telecommunications (DECT); Data Services Profile (DSP); Point-to-Point Protocol (PPP) interworking for internet access and general multi-protocol datagram transport. ETS 300 700 (1 997), Digital Enhanced Cordless Telecommunications (DECT); Wireless Relay Station (WRS). Informative re
27、ferences ETS 300 765-1 (1997), Digital Enhanced Cordless Telecommunications (DECT); Radio in the Local Loop (RLL) Access Profile (RAP); Part I: Basic telephony services. ETS 300 444 (1999, Digital Enhanced Cordless Telecommunications (DECT); Generic Access Profile (GAP). ETS 300 822 (1 998), Digital
28、 Enhanced Cordless Telecommunications (DECT); Integrated Services Digital Network (ISDN); DECT/ISDN Interworking for intermediate system configuration; Interworking und profile specification, Recommendation 5.114 (09/99) 1 101 ETR 308 (1996), Digital Enhanced Cordless Telecommunications (DECT); Serv
29、ices, facilities and confzgurations for DECT in the local loop. ETR 185 (1995), Digital Enhanced Cordless Telecommunications (DECT); Data Services Profile (DSP); Profile overview. ETS 300 651 (1996), Digital Enhanced Cordless Telecommunications (DECT); Data Services Profile (DSP); Generic data link
30、service; (service type C, class 2). ETS 300 701 (1996), Digital Enhanced Cordless Telecommunications (DECT); Data Services Profile (DSP); Genericframe relay service with mobility (service types A and B, class 2). li 12 1131 3 Abbreviations This Recommendation uses the following abbreviations: AN Aud
31、ioNideo BC Broadcast Channel CI Common Interface CTA Cordless Terminal Adapter DAM DECT Authentication Module DECT Digital Enhanced Cordless Telecommunications DSP Data Services Profile EMC Electromagnetic Compatibiiity FP Fixed Part FT Fixed Termination GAP Generic Access Profile IC Interaction Cha
32、nnel IIM Interactive Interface Module IN Interactive Network INA IRD ISDN IWU LAP LLME MAC MAW NIU NTU NWK Interactive Network Adapter Integrated Receiver Decoder Integrated Services Digital Network Inter-Working Unit Link Access Protocol Lower Layer Management Entity Medium Access Control Master An
33、tenna Television Network Interface Unit Network Termination Unit Network os1 Open Systems Interconnection PHL Physical PP Portable Part PPP Point-to-Point Protocol PSTN Public Switched Telephone Network I RAP Radio in the local loop Access Profile RF Radio Frequency 2 Recommendation J.114 (09/99) Ii
34、8b259L Ob7439b 78b RLL SMATV Satellite Master Antenna Television STB Set-Top Box STU Set-Top Unit WRS Wireless Relay Station Radio in the Local Loop 4 Reference model A reference model for the system architecture of narrow-band interaction channels in a broadband scenario (asymmetric interactive ser
35、vices) is presented in this clause. 11 4.1 Protocol stack model Within the Digital Video Broadcasting (DVB) commercial requirements for asymmetric interactive services supporting broadcast to the home with narrow-band return channel (see DVB-AO08 7), a simple communications model has been used to id
36、entie the necessity and importance of each commercial requirement consisting of the following layers (the layers do not coincide exactly with the Open Systems Interconnection (OSI) layers): - - - Physical layer: where all the physical (electrical) transmission parameters are defined. Transport layer
37、: defines all the relevant data structures and communication protocols like 2) Interactive Interface Module (IIM); and b) Set-Top Unit (STU). The user terminal provides interfaces for both broadcast and interaction channels. The interface between the user terminal and the interaction network is via
38、the IiM. 5 A DECT infrastructure can support the implementation of the interaction channel for DVE broadcasting systems by providing a wireless bidirectional communication path between the user terminal and an infrastructure connecting to the DVB interaction channel specification for DECT I service
39、provider. The basic characteristics of DECT are described in Appendix I. 4 Recommendation 5.114 (09/99) 5.1 System architecture The interactive Interface Module (UM) is implemented through a DECT Portable Part (PP) (see Figure 3). The DECT PP can be internal or external to the STB. - EH-” Ravider pd
40、apter rr- Ravider %-Top B-field (traffic) per half slot (protected mode); B-field (traffic) per full slot (unprotected mode); B-field (traffic) per full slot (protected mode); 80 kbit/s B-field (traffic) per double slot (unprotected mode); 64 kbit/s B-field (traffic) per double slot (protected mode)
41、; 6.4 kbiis A-field (controsignalling) per half slot, slot and double slot. DECT has features that could be suitable in an interactive DVB system. DECT can handle a lot of users in a small area (urban and suburban situation) and support a broad range of services. DECT has algorithms for authenticati
42、on of both the base station and the terminal as well as a simple encryption scheme DECT Authentication Module (DAM) card support. A Wireless Relay Station (WRS) can be used to extend the coverage. There is no need for traditional frequency planning as DECT uses dynamic channel selection. In the rest
43、 of this appendix, more information is provided concerning the main functionality of the DECT standard. 1.2 DECT standard The structure of the basic DECT standard (see ETS 300 175 parts 1 to 9) is based on the layered principles used in the IS0 Open Systems Interconnection (OSI) model. The complete
44、DECT Common Interface (CI) corresponds to the lower three layers of the IS0 OS1 model, but DECT defines four layers of protocol. These lower layers differ from the OS1 model because the OS1 model takes no account of either the uncertainties introduced by using radio transmissions at the physical lay
45、er or of the concept of handover. A structure of four layers is used for the signalling protocols as shown in Figure I. 1. The top of the NWK layer corresponds to the top of the OS1 layer 3. The intermediate boundaries have no OS1 equivalent but for ease of understanding an approximate correspondenc
46、e is given below: - - - OS1 Layer 1 : all of the PHL layer plus part of the MAC layer; OS1 Layer 2: most of the MAC layer plus all of the DLC; OS1 Layer 3: all of the NWK layer. 8 Recommendation 5.114 (09199) os1 Layer 3 Network Layer (NWK) Data Link Control Layer (DLC) os1 Layer 2 Data Link Control
47、 Layer (DLC) os1 Layer 1 to the subscriber from the subscriber 4 LA rw b 12 3 4 5 6 7 6 91011121 2 3 4 5 6 7 8 9101112 Lower Layer Management Entity C-Plane U-Plane A-field (64 bit) B-field (320 bit) X-field (4 bit) Z-field (4 bit) Physical Layer (PW TOO788oSWdoS Figure I.llJ.114 - The DECT layered
48、structure 1.2.1 Physical (PHL) layer The physical layer divides the radio spectrum into the physical channels. This division occurs in two fixed dimensions, frequency and time. The frequency and time division uses Time Division Multiple Access (TDMA) operation on muitiple RF carriers. Ten carriers a
49、re provided in the hquency band 1880 MHz to 1900 MHz. DECT also provides for possible extensions of the band to meet future demand. On each carrier the TDMA structure defines 24 time slots (when full slots are used) in a 10 ms Came, where each time slot may be used to transmit one self contained packet of data (see Figure 1.2). I TDMA frame = 24 timeslots (1 O ms) FRAME SLOT D-Field _-_- 0 . Figure I.2/J.114 - Example of the full slot framing structure Recommendation 5.114 (09/99) 9 Each transmitted packet contains a synchronization field, togethe
