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.196.3 TELECOMMUNICATION STANDARDIZATION SECTOR OF ITU (10/2016) SERIES J: CABLE NETWORKS AND TRANSMISSION OF TELEVISION, SOUND PROGRAMME AND OTHER MULTIMEDIA SIGNALS Cable modems and home networking Media access control l
2、ayer specification of second generation HiNoC Recommendation ITU-T J.196.3 Rec. ITU-T J.196.3 (10/2016) i Recommendation ITU-T J.196.3 Media access control layer specification of second generation HiNoC Summary Recommendation ITU-T J.196.3 describes the media access control (MAC) layer specification
3、 of second generation high performance network over coax (HiNoC) which provides 1 Gbit/s data transmission over coaxial networks. HiNoC consists of a HiNoC bridge (HB) and HiNoC modem (HM) as architectural functional entities and is layered as MAC layer and physical (PHY) layer. HiNoC 2.0 uses time
4、division duplexing (TDD) to adjust the bandwidth for upstream and downstream feasibly. HiNoC 2.0 uses time division multiple access (TDMA) and optional orthogonal frequency-division multiple access (OFDMA). The HiNoC 2.0 MAC (HiMAC) layer is composed of the convergence sublayer (CS), the common part
5、 sublayer (CPS) and the security sublayer (SS). This Recommendation contains descriptions for HiMAC frame types, functions and mechanisms of CS and CPS. History Edition Recommendation Approval Study Group Unique ID* 1.0 ITU-T J.196.3 2016-10-14 9 11.1002/1000/13050 Keywords HiNoC, MAC layer, second
6、generation 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/11.1002/1000/11830-en. ii Rec. ITU-T J.196.3 (10/2016) FOREWORD The International Telecommunicat
7、ion 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 a permanent organ of ITU. ITU-T is responsible for studying technical, operating and tariff ques
8、tions 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, establishes the topics for study by the ITU-T study groups which, in turn, produce Recommendation
9、s 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 necessary standards are prepared on a collaborative basis with ISO and IEC. NOTE In this Recommendation,
10、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, the Recommendation may contain certain mandatory provisions (to ensure, e.g., interoperability or
11、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 equivalents are used to express requirements. The use of such words does not suggest that compliance w
12、ith 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 claimed Intellectual Property Right. ITU takes no position concerning the evidence, validity or appl
13、icability 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 not received notice of intellectual property, protected by patents, which may be required to impl
14、ement 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/ITU-T/ipr/. ITU 2017 All rights reserved. No part of this publication may be reproduced, by any m
15、eans whatsoever, without the prior written permission of ITU. Rec. ITU-T J.196.3 (10/2016) iii Table of Contents Page 1 Scope . 1 2 References . 1 3 Definitions 1 3.1 Terms defined elsewhere 1 3.2 Terms defined in this Recommendation . 2 4 Abbreviations and acronyms 2 5 Conventions 3 6 MAC layer str
16、ucture . 3 7 MAC layer frame types 4 7.1 Overview 4 7.2 Signalling frame . 4 7.3 Control frame 6 7.4 Data frame 7 7.5 Encapsulation of HiMAC frames into PHY layer frames 8 7.6 Bit and octet transmission order in HiNoC 2.0 network 9 8 Convergence sublayer . 10 8.1 Function of the CS 10 8.2 Data frame
17、 framing/deframing . 10 8.3 Data frame retransmission 11 8.4 Priority mapping . 16 9 Common part sublayer 16 9.1 Media access control and channel allocation . 16 9.2 Node admission 21 9.3 Link maintenance . 34 9.4 Node quitting/deletion 43 9.5 Network synchronization and ranging 44 9.6 Power control
18、 45 Annex A Format of MAC layer frames 46 A.1 Signalling frame format 46 A.2 Control frame format . 57 A.3 Data frame format . 58 Annex B MAC layer constants . 61 Appendix I Examples of data frame retransmission mechanism 64 Appendix II HiNoC 2.0 and 1.0 MAC layer comparison . 70 Bibliography. 71 Re
19、c. ITU-T J.196.3 (10/2016) 1 Recommendation ITU-T J.196.3 Media access control layer specification of second generation HiNoC 1 Scope This Recommendation specifies the media access control (MAC) layer protocol and is part of a series of second generation high performance network over coax (HiNoC) Re
20、commendations for high speed data transmission over coaxial cable. This Recommendation applies to bi-directional high-performance wideband access digital systems that use coaxial cable connected between fibre-to-the-building and HiNoC modems (HMs). 2 References The following ITU-T Recommendations an
21、d other references contain provisions which, through reference in this text, constitute provisions of this Recommendation. At the time of publication, the editions indicated were valid. All Recommendations and other references are subject to revision; users of this Recommendation are therefore encou
22、raged to investigate the possibility of applying the most recent edition of the Recommendations and other references listed below. A list of the currently valid ITU-T Recommendations is regularly published. The reference to a document within this Recommendation does not give it, as a stand-alone doc
23、ument, the status of a Recommendation. ITU-T J.195.1 Recommendation ITU-T J.195.1 (2016), Functional requirements for high speed transmission over coaxial network connected with fibre to the building. ITU-T J.195.2 Recommendation ITU-T J.195.2 (2014), Physical layer specification for high speed tran
24、smission over coaxial networks. ITU-T J.195.3 Recommendation ITU-T J.195.3 (2014), Medium Access Control layer specification for high speed transmission over coaxial networks. ITU-T J.196.2 Recommendation ITU-T J.196.2 (2016), Physical layer specification of second generation HiNoC. 3 Definitions 3.
25、1 Terms defined elsewhere This Recommendation uses the following terms defined elsewhere: 3.1.1 control frame ITU-T J.195.2: Frame of the MAC layer used for access control and channel allocation. 3.1.2 data frame ITU-T J.195.2: Frame of the MAC layer used to carry data of the upper layer. 3.1.3 down
26、link ITU-T J.195.2: Link from HiNoC bridge (HB) to HiNoC modem (HM). 3.1.4 MAP cycle ITU-T J.195.3: A period of time planned by a MAP frame. 3.1.5 packing ITU-T J.195.1: A procedure of combining multiple Ethernet media access control (MAC) frames with the same destination and priority to form a high
27、 performance network over coax (HiNoC) MAC frame. 3.1.6 Pd cycle ITU-T J.195.2: A time interval between two adjacent downlink Probe frames. 3.1.7 segmentation b-ITU-T X.233: The act of generating two or more derived PDUs from an initial or derived PDU. The derived PDUs together carry the entire user
28、 data of the initial or derived PDU from which they were generated. 2 Rec. ITU-T J.196.3 (10/2016) 3.1.8 signalling frame ITU-T J.195.2: Frame of the MAC layer used for node admission, node quitting/deletion and link maintenance. 3.1.9 uplink ITU-T J.195.2: Link from HiNoC modem (HM) to HiNoC bridge
29、 (HB). 3.2 Terms defined in this Recommendation This Recommendation defines the following term: 3.2.1 Grouping-broadcast: A transmission method for a HiNoC bridge (HB) to broadcast frames to the HiNoC modems (HMs) joined in a certain group with the group ID indicated in the frame headers, while the
30、HMs that are not part of the group cannot receive the frames. 4 Abbreviations and acronyms This Recommendation uses the following abbreviations and acronyms: ARQ Automatic Repeat Request Cd downlink Control CP Cyclic Prefix CPS Common Part Sublayer CRC Cyclic Redundancy Check CS Convergence Sublayer
31、 Dd downlink Data Du uplink Data EISF Extended Information Subframe EMAC Ethernet MAC FEC Forward Error Correction HB HiNoC Bridge HiMAC HiNoC 2.0 MAC HiNoC High performance Network over Coax HM HiNoC Modem IFG Inter-Frame Gap MAC Media Access Control MAP Media Access Plan NHM New HiNoC Modem OFDMA
32、Orthogonal Frequency-Division Multiple Access Pd downlink Probe PDU Protocol Data Unit PE Parameter Element Pu uplink Probe Ru uplink Report SC Sub-Channel SCG_Ru Sub-Carrier Group for Ru frame Rec. ITU-T J.196.3 (10/2016) 3 SDL Specification and Description Language SDU Service Data Unit SS Securit
33、y Sublayer SSC Symbol Sub-Cell TDMA Time Division Multiple Access TLV Type-Length-Value 5 Conventions The keywords “is/are required to“ 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
34、 “is recommended“ indicate a requirement which is recommended but which is not absolutely required. Thus this 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 con
35、formance to this Recommendation is to be claimed. The keywords “can optionally“ indicate an optional requirement 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 op
36、tionally enabled by the network operator/service provider. Rather, it means the vendor may optionally provide the feature and still claim conformance with the specification. In the body of this Recommendation and its annexes, the words shall, shall not, should, and may sometimes appear, in which cas
37、e they are to be interpreted, respectively, as is required to, is prohibited from, is recommended, 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. The keywords “HiNoC 1.
38、0“ indicate the HiNoC system defined by the ITU-T J.195-series Recommendations. The keywords “HiNoC 2.0“ indicate the second generation HiNoC. 6 MAC layer structure The HiNoC 2.0 MAC (HiMAC) layer is required to consist of the convergence sublayer (CS) and common part sublayer (CPS), and can optiona
39、lly include the security sublayer (SS). The CS provides adaptation functions between the CPS and the higher layer, including address learning, packet forwarding table generation, priority mapping, framing/deframing and data frame retransmission (optional) functions. The CPS provides media access con
40、trol, channel allocation, node admission, node quitting/deletion and link maintenance functions. The SS defines the identity authentication mode, data encryption mode and secret key management mode. The structure of the HiMAC is shown in Figure 1. 4 Rec. ITU-T J.196.3 (10/2016) Figure 1 HiMAC struct
41、ure When accepting protocol data units (PDUs) from the higher layer, the CS is required to first perform priority mapping and send these PDUs to the corresponding queues. The CPS is required to forward the HiMAC data frames and utilize report-authorization-based media access control and channel allo
42、cation mechanism to transmit data between the HiNoC bridge (HB) and HM. 7 MAC layer frame types 7.1 Overview Three types of HiMAC frames are defined: signalling frame, control frame, and data frame. 7.2 Signalling frame Signalling frames are required to provide the functions of the signalling exchan
43、ge between the HB and HM during the node admission, node quitting/deletion and link maintenance. Signalling frames are divided into downlink signalling frames and uplink signalling frames. a) Downlink signalling frame The generic format of the downlink signalling frame is shown in Figure 2. The fram
44、e consists of a frame header, payload, padding (optional) and tail. Specifically, the frame header and payload consist of fixed part and extended part (optional). The extended part follows behind the fixed part and is required to consist of the number of the type-length-value (TLV) coding blocks and
45、 one or more TLV coding blocks for future function supplement; the length of extended part is variable and the value can be found in Annex A.1.1. The padding field is required to be filled with bit 0 and its length is variable (0) to guarantee that the length of the downlink signalling frame is a fi
46、xed value. The tail is required to be a 32-bit cyclic redundancy check (CRC) sequence generated over all the fields before the tail. Its generator polynomial is defined in equation (1). 1)( 2457810111216222326321 xxxxxxxxxxxxxxxg (1) Rec. ITU-T J.196.3 (10/2016) 5 A detailed definition of the payloa
47、d field is provided in Annex A.1.1, in which fixed parts, extended parts and the TLV coding format are presented. Figure 2 Generic downlink signalling frame format HiNoC 2.0 is required to define the nine downlink signalling frame types listed in Table 1. Table 1 Downlink signalling frame types Fram
48、e type Function EMPTY Used in downlink training and ranging ADM_RES Response to an admission request REJ Indicates that the HB refuses the admission request from the corresponding HM or will delete a corresponding HM from the network ULINK_REPORT Informs about the uplink parameters ACK Acknowledgeme
49、nt to DLINK_REPORT CMP_REPORT Advertises the downlink broadcast parameters/grouping-broadcast parameters of the network LINK_UPDATE Prompts HMs to update their link parameters QUIT_ACK Acknowledgement to QUIT POWER_CTRL Prompts an HM to adjust its transmission power gain b) Uplink signalling frame The generic format of the uplink signalling frame is shown in Figure 3. The frame consists of a frame header, payload, padding (optional) and tail. Specifically, the frame header and payload consist of fixed part
