Home Networking On Coax for Video and Multimedia Overview for IEEE 802.1AVB Shlomo Ovadia www.mocalliance.org
Outline: What is MoCA? MoCA home usage model MoCA MAC/PHY features Field test results Summary May 30, 2007 Home Networking Digital Entertainment Without Compromise 2
About MoCA MoCA s Mission To develop and promote specifications and certify interoperable products that enable distribution of entertainment within the home using the existing in-home coaxial cabling Board of Directors Comcast, Cox, Echostar, Entropic, Linksys, Motorola, Panasonic, RadioShack, Toshiba, Verizon MoCA Activities Develop technical specifications, validate through field tests, certify MoCA enabled products as interoperable, and ensure access to necessary intellectual property for all members on reasonable and non-discriminatory terms Join MoCA: http://www.mocalliance.org/en/join/index.asp May 30, 2007 Home Networking Digital Entertainment Without Compromise 3
Drivers for Home Multimedia Networks Cable operator whole-home DVR and triple play DBS whole-home DVR Telco triple-play : video, voice, data Retail Home server & client for multimedia DVD-DVR combo Media Center PC to Media Center Extender/TV Backbone for Wi-Fi May 30, 2007 Home Networking Digital Entertainment Without Compromise 4
Multimedia Throughput Needs Data rate Simultaneous multiple HDTV,SDTV, data, voice, gaming,... Ave Mbps Peak Mbps Trick mode Mbps SDTV 1-2.5 2-9 4 20 HDTV 8-20 8-25 8 40+ ATSC 20 20 20 40+ Customers ask MoCA for 60 to 100+ Mbps net throughput Quality & reliability Does not degrade when other services are added Does not degrade when neighbor or housemate runs services Does not degrade when home appliances are turned on May 30, 2007 Home Networking Digital Entertainment Without Compromise 5
The Home Usage Model And Connectivity Each room can be a source and sink of multi-media content Consumers may Move equipment to other rooms Add a cable or splitter Mandatory connectivity model Room-to-room, peer-to-peer, full mesh, all outlets source and sink Backwards through splitters MoCA is the only technology that provides no-excuses networking roomto-room over in-home coax as is c.link No de 1 WiFi Repeater IP-STB PVR TV IP-STB PVR TV Splitter Splitter PC 2 Splitter Splitter IP-STB Client TV Acc es s Point Needed Home Router Splitter Connectivity Model Desirable Not Desirable Splitter Game Box IP-STB Client TV 802.11 Splitter Multi-tap DSL GW or ONT Cl ient 1 4 3 Client 3 Client 2 May 30, 2007 Home Networking Digital Entertainment Without Compromise 6
MoCA Channel Characteristics A SP- 41G 70 ft 45 ft 15 ft D B C Room-to-room characteristics dictate and require a custom PHY/MAC solution for ubiquitous coverage WAN Point Of Entry 10 ft 3:1 Splitter SP- 21G 10 ft E 40 ft F NORMAL 2-WAY CATV PATH Node Device SPLITTER JUMPING Frequency Response Long Path: F B Frequency Response Short Path: F E 3:1 Splitter 2:1 Splitter SPLITTER JUMPING Node Device Node Device Node Device Node Device Node Device May 30, 2007 Home Networking Digital Entertainment Without Compromise 7
Coexistence with Other Services Coexistence with other services is required Cable modem upstream (5-42 MHz) Cable operator downstream (50-860 MHz) Coax and splitters support reliable communications above 860 MHz 5-42 Upstream 4-12 VDSL 54-806/860 Off-Air/CATV 950-2150 Satellite L-Band A1 B1 C1 C2 C3 C4 D1 D2 D3 D4 D5 D6 D7 D8 1150 1200 1250 1300 1350 1400 1450 1500 900 1000 1100 1200 1300 1400 1500 1600 MHz May 30, 2007 Home Networking Digital Entertainment Without Compromise 8
MoCA PHY Layer Features 50 MHz MoCA channel bandwidth 224 OFDM subcarriers signal where each subcarrier can be modulated from BPSK to 256-QAM Adaptive bitloading OFDM at the transmitter PHY layer packet are R-S encoded for error recovery Three different probes are used to characterize the MoCA channel condition Four types of preambles are used for different PHY data packets to optimize throughput MoCA channels are located at different frequency bands between 875 MHz to 1500 MHz Robust PHY layer transmissions (PER 10-5 ) over coax using Time- Division Duplexing (TDD) PHY data rate in a two-node MoCA network > 250 Mb/s May 30, 2007 Home Networking Digital Entertainment Without Compromise 9
MoCA MAC Layer Features Distributed mesh network architecture with TDMA based scheduled access MoCA network support communications from 2 to 8 nodes Any MoCA node can become a Network Coordinator (NC) node automatically selected NC node broadcasts beacons every 10 ms Network access is coordinated using MAPs and reservations MAPs are transmitted by the NC node 1 ms Every node must go through an admission process before becoming part of the MoCA network Every node gets a reservation opportunity to send packets per MAP Robust network operation every node periodically updates its transmit power levels and PHY profiles using link maintenance operation (LMO) Seamless recovery of network backup NC node takes over when NC fails Secured network - all packets in the MoCA network are encrypted except for beacons May 30, 2007 Home Networking Digital Entertainment Without Compromise 10
MoCA Specification Development Initial MoCA MAC/PHY Specification v1.0 was released on 2/26/06. Latest MoCA MAC/PHY Specification v1.0 was released on 4/5/07. Extensions to MoCA specification are being discussed in SWG include: L2ME Messaging protocols Full-Mesh Rate Transaction Parameterized QoS Transactions 16 nodes Packet aggregation May 30, 2007 Home Networking Digital Entertainment Without Compromise 11
Field Testing of MoCA Goal - validate performance and coverage in real world conditions Field Test conducted in 250 homes, 15 cities Multiple operators and service providers All MoCA Members participated in tests Tests conducted under normal living conditions No modifications to cable plant Existing devices connected to cable Existing services connected to cable Tests systems designed for use by non-technical persons MoCA nodes deployed at each home cable outlet Test coordinated by laptop PC Collected multiple statistics on coverage, performance, and link May 30, 2007 Home Networking Digital Entertainment Without Compromise 12
Field Test Results Packet Error Rate less than 10-6 Average one-way latency less than 3.5 ms Net usable (MAC) data rates, with no changes to the home coax system: 97% of all paths in all homes achieved 100 Mbps Net usable (MAC) data rates, with simple remediation to the installed coax cable system: 100% of homes achieved 95 Mbps on every path in the home May 30, 2007 Home Networking Digital Entertainment Without Compromise 13
MoCA Performance/Coverage Performance: Percent of Paths vs. Bit Rate 100 90 80 70 60 % Paths 50 40 30 20 10 0 0 50 100 150 200 250 Mbps PHY Rate Throughtput (MAC) Rate May 30, 2007 Home Networking Digital Entertainment Without Compromise 14
Summary Home usage model room-to-room, peer-to-peer, full mesh connectivity 100 Mbps net throughput No-excuses, glitch-free video Consumer or Service provider enabled Coexistence with other services A reliable home mesh networking of digital content among MoCA devices using existing coaxial cables Proven real-world validation Large scale deployment of MoCA ( > 5M installed MoCA nodes) >100Mbps in 97% of all connections Reasonable remediation for other connections Secured network with seamless network recovery when NC fails May 30, 2007 Home Networking Digital Entertainment Without Compromise 15