1、 I n t e r n a t i o n a l T e l e c o m m u n i c a t i o n U n i o n ITU-T J.195.1 TELECOMMUNICATION STANDARDIZATION SECTOR OF ITU (03/2016) SERIES J: CABLE NETWORKS AND TRANSMISSION OF TELEVISION, SOUND PROGRAMME AND OTHER MULTIMEDIA SIGNALS Cable modems and home networking Functional requirement
2、s for high speed transmission over coaxial networks connected with fibre to the building Recommendation ITU-T J.195.1 Rec. ITU-T J.195.1 (03/2016) i Recommendation ITU-T J.195.1 Functional requirements for high speed transmission over coaxial networks connected with fibre to the building Summary Rec
3、ommendation ITU-T J.195.1 specifies the functional requirements of high performance network over coax (HiNoC) for high-speed data transmission over coaxial networks in the cable industry. Internet protocol (IP) technology is one of the foreseeable trends of the next generation broadcasting network,
4、which needs to fully support triple-play services and the rapidly increasing bandwidth demands for multichannel video services. Therefore, it is necessary to define the functional requirements of HiNoC. This Recommendation contains descriptions of functional requirements for the general system, phys
5、ical layer (PHY) and media access control (MAC) layer functions over coaxial networks connected with fibre to the building. This Recommendation also provides a HiNoC operation-deployment scenario and HiNoC use cases. History Edition Recommendation Approval Study Group Unique ID* 1.0 ITU-T J.195.1 20
6、13-03-01 9 11.1002/1000/11879 2.0 ITU-T J.195.1 2016-03-15 9 11.1002/1000/12765 Keywords Coaxial network, HiNoC. _ * To access the Recommendation, type the URL http:/handle.itu.int/ in the address field of your web browser, followed by the Recommendations unique ID. For example, http:/handle.itu.int
7、/11.1002/1000/11830-en. ii Rec. ITU-T J.195.1 (03/2016) FOREWORD The International Telecommunication Union (ITU) is the United Nations specialized agency in the field of telecommunications, information and communication technologies (ICTs). The ITU Telecommunication Standardization Sector (ITU-T) is
8、 a permanent organ of ITU. 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 Standardization Assembly (WTSA), which meets every four years,
9、establishes the topics for study by the ITU-T study groups which, in turn, produce Recommendations on these topics. The approval of ITU-T Recommendations is covered by the procedure laid down in WTSA Resolution 1. In some areas of information technology which fall within ITU-Ts purview, the necessar
10、y standards are prepared on a collaborative basis with ISO and IEC. NOTE In this Recommendation, the expression “Administration“ is used for conciseness to indicate both a telecommunication administration and a recognized operating agency. Compliance with this Recommendation is voluntary. However, t
11、he Recommendation may contain certain mandatory provisions (to ensure, e.g., interoperability or applicability) and compliance with the Recommendation is achieved when all of these mandatory provisions are met. The words “shall“ or some other obligatory language such as “must“ and the negative equiv
12、alents are used to express requirements. The use of such words does not suggest that compliance with the Recommendation is required of any party. INTELLECTUAL PROPERTY RIGHTSITU draws attention to the possibility that the practice or implementation of this Recommendation may involve the use of a cla
13、imed Intellectual Property Right. ITU takes no position concerning the evidence, validity or applicability of 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, ITU had
14、not received notice of intellectual property, protected by patents, which may be required to implement this Recommendation. However, implementers are cautioned that this may not represent the latest information and are therefore strongly urged to consult the TSB patent database at http:/www.itu.int/
15、ITU-T/ipr/. ITU 2016 All rights reserved. No part of this publication may be reproduced, by any means whatsoever, without the prior written permission of ITU. Rec. ITU-T J.195.1 (03/2016) iii Table of Contents Page 1 Scope . 1 2 References . 1 3 Definitions 1 3.1 Terms defined elsewhere 1 3.2 Terms
16、defined in this Recommendation . 1 4 Abbreviations and acronyms 2 5 Conventions 3 6 Architecture 4 7 Functional requirements . 5 7.1 General requirements 5 7.2 System requirements of the PHY layer 6 7.3 System requirements of the MAC layer . 6 Appendix I Scenario for HiNoC operation-deployment . 8 A
17、ppendix II Use cases of HiNoC 10 Bibliography. 12 iv Rec. ITU-T J.195.1 (03/2016) Introduction Recommendation ITU-T J.195.1 defines one solution, namely high performance network over coax (HiNoC), to address high-density small office, home office (SOHO) end-user requirements by using fibre to the bu
18、ilding (FTTB) infrastructure and coax architecture. HiNoC is layered into the media access control (MAC) layer and the physical layer (PHY) to fully utilize the unassigned spectrum of the “last 100 m“ coaxial network in order to provide more bandwidth and improve the spectral efficiency. HiNoC also
19、supports the operations of existing TV broadcasting services. Rec. ITU-T J.195.1 (03/2016) 1 Recommendation ITU-T J.195.1 Functional requirements for high speed transmission over coaxial networks connected with fibre to the building 1 Scope This Recommendation defines the functional requirements of
20、high performance network over coax (HiNoC) for high-speed data transmission over coaxial networks connected with fibre to the building (FTTB). The functionalities described in this Recommendation are based on FTTB + coax architecture. HiNoC provides more bandwidth with the unassigned spectrum of the
21、 last 100 m coaxial network. HiNoC also supports the operations of existing TV broadcasting services. 2 References None. 3 Definitions 3.1 Terms defined elsewhere This Recommendation uses the following terms defined elsewhere: 3.1.1 access network b-ITU-T Q.1742.1: Network that connects access techn
22、ologies (such as a radio access network) to the core network. 3.1.2 data encryption b-ITU-T J.191: Data encryption prevents the unauthorized disclosure/access of data. Data encryption does an excellent job at providing data confidentiality and protection against theft of service. Encryption prevents
23、 making data unable to read without the correct decrypting key; however, it does not validate the source/receiving entities and it does not provide copy protection after the data has been decrypted. It also does not prevent DoS attacks. 3.1.3 dynamic channel allocation b-ITU-T F.723: The principle o
24、f allocating in a flexible way the available channel capacity between various types of data, comprising audio, video, control information, still pictures and other application specific data to maximize the quality of service. 3.1.4 key management b-ITU-T J.160: The process of distributing shared sym
25、metric keys needed to run a security protocol. 3.1.5 out-of-band attenuation b-ITU-T G.671: The minimum attenuation (in dB) of channels that fall outside of the operating wavelength range. 3.1.6 packet classification b-ITU-T Y.1222: The process of distinguishing Ethernet frames for the purpose of ap
26、plying appropriate traffic control and congestion control mechanisms is called Ethernet frame classification. 3.2 Terms defined in this Recommendation This Recommendation defines the following terms: 3.2.1 address learning: A process that establishes the mapping between higher layer protocol data un
27、it (PDU) addresses and high performance network over coax (HiNoC) node addresses. 3.2.2 centralized distribution structure: A physical structure of a passive coaxial access network and a multiple stage power distribution network realized by splitters only. 2 Rec. ITU-T J.195.1 (03/2016) 3.2.3 conste
28、llation mapping: The process of mapping data bits to the constellation symbol. 3.2.4 link maintenance: The function of estimating and exchanging parameters of links between a master node and client nodes to adapt to the variation of channel characteristics and maintain the steady working of the syst
29、em. 3.2.5 node quitting/deletion: The function to support a client node quitting a high performance network over coax (HiNoC) system or a master node deleting a client node from a HiNoC system. 3.2.6 package filter: The process of analysing and selecting a data packet according to the established ru
30、le set. 3.2.7 packing: A procedure of combining multiple Ethernet media access control (MAC) frames with the same destination and priority to form a high performance network over coax (HiNoC) MAC frame. 3.2.8 passive coaxial access network: An access network composed of a coaxial network and passive
31、 power distribution components such as splitters and taps. 3.2.9 service priority mapping: A function whereby the media access control (MAC) layer maps the service stream matching the message features into the assignment priority queue of the quality of service (QoS) level and simultaneously re-labe
32、ls the priority level of the service stream. 3.2.10 stream classification: The process of distinguishing higher layer protocol data units (PDUs) in order to apply appropriate traffic and congestion control mechanisms. 3.2.11 tree distribution structure: A physical structure of a passive coaxial acce
33、ss network and a multiple stage power distribution network realized by splitters and taps or by taps only. 3.2.12 unpacking: A procedure of dividing a high performance network over coax (HiNoC) media access control (MAC) frame into individual Ethernet MAC frames; the opposite of packing. 4 Abbreviat
34、ions and acronyms This Recommendation uses the following abbreviations and acronyms: 3DTV three Dimensional Television 3G third Generation 4G fourth Generation AP Access Point AWGN Additive White Gaussian Noise BER Bit Error Rate CPS Common Part Sublayer CS Convergence Sublayer DBA Dynamic Bandwidth
35、 Allocation EMC Electromagnetic Compatibility FEC Forward Error Correction FTTB Fibre To The Building GSM Global System for Mobile communications HB HiNoC Bridge Rec. ITU-T J.195.1 (03/2016) 3 HiNoC High performance Network over Coax HM HiNoC Modem IP Internet Protocol IPv4 Internet Protocol version
36、 4 IPv6 Internet Protocol version 6 MAC Media Access Control MSO Multiple Systems Operator OFDM Orthogonal Frequency Division Multiplexing OLT Optical Line Terminal ONU Optical Network Unit PDU Protocol Data Unit PHY Physical layer PON Passive Optical Network QoS Quality of Service SAP Service Acces
37、s Point SD/HD TV Signal Degrade/High Definition Television SOHO Small Office, Home Office SS Security Sublayer STB Set-Top Box TDD Time Division Duplexing TV Television UHDTV Ultra High-Definition Television VoIP Voice over Internet Protocol Wi-Fi Wireless Fidelity 5 Conventions In this Recommendati
38、on: The keywords “is required to“ indicate a requirement which must be strictly followed and from which no deviation is permitted if conformance to this document is to be claimed. The keywords “is recommended“ indicate a requirement which is recommended but which is not absolutely required. Thus thi
39、s requirement need not be present to claim conformance. The keywords “is prohibited from“ indicate a requirement which must be strictly followed and from which no deviation is permitted if conformance to this Recommendation is to be claimed. The keywords “can optionally“ indicate an optional require
40、ment which is permissible, without implying any sense of being recommended. This term is not intended to imply that the vendors implementation must provide the option and the feature can be optionally enabled by the network operator/service provider. Rather, it means the vendor may optionally provid
41、e the feature and still claim conformance with the specification. 4 Rec. ITU-T J.195.1 (03/2016) In the body of this Recommendation, the words shall, shall not, should, and may sometimes appear, in which case they are to be interpreted, respectively, as is required to, is prohibited from, is recomme
42、nded, and can optionally. The appearance of such phrases or keywords in an appendix or in material explicitly marked as informative are to be interpreted as having no normative intent. 6 Architecture The logical architecture model of HiNoC is shown in Figure 1. The model includes two parts: a master
43、 node and client nodes. The master node links the passive optical network (PON) and the client nodes link home terminals. J . 1 9 5 . 1 (1 3 )_ F 0 1M a s t e rnodeC l i e n tnodeC l i e n tnodeC l i e n tnodeD a t a 1 / 2 / 3D a t a 1D a t a 2D a t a 3D a t a 1 / 2 / 3Figure 1 HiNoC logical archite
44、cture A master node supports several registered client nodes and may have an upper limit for the number of registered client nodes. In a network there may be one or several master nodes. The master node manages the allocation of global coaxial network resources and matches the uplink PON transmissio
45、n capacity. With reference to the uplink bandwidth availability, the master node assigns each clients upstream and downstream bandwidth based on the balance between the clients bandwidth requests and the dynamic bandwidth allocation (DBA)/quality of service (QoS)/priority configuration. The master n
46、ode detects and maintains the linkage with clients. The client node communicates with the master node and provides bandwidth to the connected terminals. The client node identifies the requests of the service flows supported by the terminal and negotiates with the master node for the upstream and dow
47、nstream bandwidth. The protocol stack of HiNoC is defined in Figure 2. The protocol stack includes the physical layer (PHY) and media access control (MAC) layer. Rec. ITU-T J.195.1 (03/2016) 5 J. 1 9 5 . 1 (1 3 )_ F 0 2U p p er et h ern et lay erCo n v erg en ce s u b lay erCo mmo n p art s u b lay
48、erPh y s ical lay er PH YM A CSec u ri ty s u b lay erSA PSA PSA PH iN o CFigure 2 HiNoC protocol architecture The PHY layer frames the data fed from the MAC layer, modulates the frame after the appropriate channel coding and transmits into the coaxial network, and vice versa. The MAC layer provides
49、 two functions: one is media access control and the other is service adaptation, and includes the common part sublayer (CPS) and convergence sublayer (CS), and may also include a security sublayer (SS). The CS provides the adaptation between the CPS and the higher layer including address learning, packet forwarding table generation, service priority mapping and data frame packing/unpacking functions. The CPS provides MAC, channel and bandwidth allocation, node registration and abortion and linkage maintenance functions. The SS provides
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