DOCSIS 3.1. High Level Overview at NANOG 59. Karthik Sundaresan, Lead Architect. Oct 09, Cable Television Laboratories, Inc.
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1 DOCSIS 3.1 High Level Overview at NANOG 59 Karthik Sundaresan, Lead Architect Oct 09, 2013
2 Key Objectives PHY & MAC layer choices Evolution of the DOCSIS network architecture Summary Slide 2
3 DOCSIS is a global standard deployed on all continents Over 180 million units shipped worldwide Data services over the Hybrid Fiber Coax Plant Video Services IP Services Voice Services MSO Core Aggregation Network CMTS CMTS CMTS DOCSIS Optical Node Homes Passed CM CM CM CM CM CM CM Line RF Amplifiers
4 DOCSIS 1.0 High Speed Internet Access DOCSIS 1.1 Voice, Gaming, Streaming DOCSIS 2.0 Capacity for Symmetric Services DOCSIS 3.0 Channel Bonding,IPv6 DOCSIS 3.1 OFDM, Wideband Channel Slide 4
5 DOCSIS 3.1 Key Project Objectives
6 Higher Capacity: Efficient 10+ Gbps downstream, 2+ Gbps upstream Cost Reduction: Significant cost per bit reduction w.r.t. DOCSIS 3.0 Plant Adaptation: Adapt to different spectrum, plant conditions Effective Migration Strategy: Allow success based migration, investment Existing HFC Network Operation: Operates without modification of network, actives Slide 6
7 New Forward Error Correction (FEC) Low Density Parity Check (LDPC) enables higher order modulation (e.g. 1024,4096 QAM) Greater spectral efficiency (bits/second/hz) 256 QAM to 4096 QAM = 50% Operation across large bands of spectrum Multi-Gigabit speeds require larger spectrum bands E.g. ~500 of downstream spectrum at 10 bits/ symbol (net) for ~5 Gbps Note: DOCSIS 3.0 would require ~780 for 5 Gbps Slide 7
8 OFDM for upstream, downstream Robust operation, efficient use of spectrum Multiple narrow sub-carriers transmitted together in a block No more 6/8 channel restrictions Enables plant adaptation Adjustment to channel conditions with khz resolution Operation into band edge Easy expansion into available spectrum Slide 8
9 DOCSIS 3.1 CMs will operate on DOCSIS 3.0 CMTSs Deploy on existing CMTS/CCAP, incrementally activate new PHY capabilities when upgraded DOCSIS 3.1 CMTSs will support DOCSIS 3.0 CMs Can continue to use DOCSIS 2.0 & 3.0 CMs after DOCSIS 3.1 upgrades CMs and CMTSs will support bonding 24 downstream SC-QAM channels 8 upstream SC-QAM channels CMs and CMTSs will support bonding between D3.0 and D3.1 channels Slide 9
10 Upstream spectrum remains below downstream CPE devices support existing splits (42/65 ) and higher splits (85 and 200 ) Activate OFDM sub-carriers to increase capacity as needed CPE devices operate in existing downstream and higher spectrum enabled by network and passive elements, up to ~1.2 GHz No plant changes required to deploy DOCSIS 3.1 equipment Future proof - If MSOs chose to expand HFC spectrum in the future, no CPE or infrastructure swap required to increase capacity /65 85/ ,000 1,200* Upstream Downstream Slide 10
11 DOCSIS 3.1 PHY & MAC Layer Choices MAC Convergence Layer PHY
12 OFDM Numerology Max Channel BW, varied channel sizes, Num of subcarriers Downstream and Upstream, Number of OFDM channels Varied FFT Sizes and Subcarrier spacing New Frequency Ranges, Splits Higher Modulation orders US/DS TX/RX New Fidelity requirements Proactive Network Maintenance New Convergence Layer Slide 12
13 OFDM channel treated like a SC-QAM channel Provides flexibility to the scheduler for optimizing service Support for bonding between: OFDM channels SC-QAM (DOCSIS 3.0) channels Between each type of channel Works along with Simultaneous Time and Frequency Division Multiplexing Slide 13
14 Ranging and Probing Profile Testing and assignment Larger MTU Size : 2000 bytes Energy Management : Light sleep mode Timing & Synchronization : Higher precision and accuracy Active Queue Management Hierarchical QoS : Advanced Bandwidth Management Slide 14
15 D3.1 Migration and Network Evolution
16 CPE Devices Few 1.0/1.1 Lots of 2.0 Some 3.0 DOCSIS 3.0 CPE Remove 1.0/1.1? More 3.0 Many 3.0 Begin deploy 3.1 Lots of 3.0 More 3.1 DOCSIS 3.1 CPE Lots of 3.1 Cap 3.0 CPE Leverages Spectrum CPE Refresh Today Soon 3.1 CPE 3.1 DS / US CCAP Augment HFC HE Equipment 5-42/65 US 3.0 CMTS DS Bonding 3.0 DS CCAP More DS Bonding US Bonding S- CDMA? 3.0 D/US CCAP More DS & US bonding 3.1 CCAP Begin 3.1 DS and/or US OFDM Expand DS OFDM spectrum Expand US Split Expand DS HE upgrade DOCSIS 3.0 HE DOCSIS 3.1 HE
17 Legacy OOB US 1-3 LD Channels Analog Legacy OOB DS Today some US bonding, 8 target DS 4-8 LD Channels Out-of-Band Motorola OOB Cisco OOB D3.0 D /65 54/ ,000 Tomorrow Full US bonding (<8), 500 Mbps+ DS D3, D3.1 CPE in D3 mode Legacy OOB US 1-4 LD Channels Analog Legacy OOB DS 4-24/32 LD Channels /65 54/ ,000 Upstream Downstream Slide 17
18 Legacy OOB US 1-6 LD Channels 2015/16 Add D3.1 signals in available spectrum Analog Legacy OOB DS 8-24/32 LD Channels Out-of-Band Motorola OOB Cisco OOB D3.0 D3.1 (OFDM) /65 54/ Bond D3 and D3.1 groups for high rate tier 1,000 Legacy OOB US 1-6 LD Channels Future Change split, expand BW 8-24/32 LD Channels / ,000 1,200* Upstream Downstream * Potential 1700 w/tap face plate changes
19 Operates on and increases efficiency on existing HFC Top speeds and capacity require more IP spectrum Start with a small block and bond to DOCSIS 3.0 channels Video optimization and all IP migration to free spectrum Optimize to high BW customers HFC upgrades can also benefit efficiency and opex Core network investments made with BW growth Head-end Distribution Hub Transport Ring Distribution Hub Optical Node Public WiFi Access Points Distribution 8-24 Fibers Hub Enterprise Optical Node Homes Passed Optical Node Optical Node Optical Node Trunk RF Amplifier Line RF Amplifiers SMB 19
20 New LDPC FEC and higher order modulation OFDM upstream and downstream Backward compatibility with DOCSIS 3.0 system Channel Bonding (24x8 SC-QAM channel minimum) Upstream below downstream (no top split ) Operates on existing plant without changes Slide 20
21 DOCSIS 3.1 technology enables faster services Capital investment can be made per customer demand DOCSIS 3.1 specifications are latest in the series that has evolved to meet anticipated future demand and facilitate new applications Cost-effectively scale to multi-gigabit services Works in and further optimizes existing HFC plant Options for new spectrum usage; increasing capacity State-of-the-Art technologies and innovation Slide 21
22 Questions? Thanks!
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