Download - Are You Ready for DOCSIS 3.1

Are You Ready for DOCSIS 3.1

Presenter: Tony HolmesVeEX Field Applications Engineer

CONFIDENTIAL 3.1 | Bootcamp 2

DOCSIS 3.1 Introduction DOCSIS 3.1 Basics Using the Tools Migration Plans

Technical Session Overview

DOCSIS 3.1 Introduction

Confidential & Proprietary Information of VeEX Inc. 3Presentation Name Here

Traffic growth is driven by demand and competition

The DOCSIS 3.1 spec will greatly increase the bandwidth performance of the HFC plant using OFDM PHY & LDPC FEC

10+ Gbps Downstream & 1+ Gbps Upstream will permit DOCSIS to satisfy subscriber BW needs well in to the future

DOCSIS scales very well. Efficient spectrum utilization Node splits Adding BW (DS & US) Mid-split/High-Split architecture DOCSIS Enhancements (higher modulations, new

PHY/FEC, etc.)

Why DOCSIS 3.1?

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Higher orders of modulation (HOM)

Elimination/ Reduction of RF guard band

Greater capacity achieved primarily through LDPC (HOM in clean channel) and OFDM (elimination of guard bands and HOM in impaired channels)

Close to 2X improvements over DOCSIS 3.0

More Capacity needed?

5

DOCSIS 3.1 delivers more throughput in existing spectrum Capitalizes on the new LDPC FEC & OFDM PHY technologies

Permits higher modulation orders (QAM 1024, 4096 & etc.)

Eliminates 6MHz & 8MHz channelization (N.A & Europe can unify)

Upstream operation up to at least 200MHz

Downstream operation to at least 1.2GHz

Will use bit-loading to adjust to the HFC plant

DOCSIS 3.1 Delivers More Throughput

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DOCSIS 3.1 Basics

3.1 | Bootcamp 7

Example of Spectrum Options

3.1 | Bootcamp 8

Downstream Spectrum Options 1. Initially use 750/862/1002 MHz Plants (> 6 Gbps) 2. Next up to 1.2 GHz with amp upgrade (> 7Gbps +) 3. Long-term to 1.7 GHz with tap upgrade (> 10Gbps +)

Upstream Spectrum Options 1. Use the current sub-split 42/65 MHz (> 200 Mbps) 2. mid-split 85 MHz (> 400 Mbps) 3. high-split 230 MHz (> 1Gbps)

CONFIDENTIAL

Orthogonal Frequency Division Multiplexing = large collection of very narrow QAM sub-carriers

Sub-carriers are grouped into OFDM blocks which are processed by FFT

OFDM

3.1 | Bootcamp 9CONFIDENTIAL

No wasted Capacity


OFDM sub-carriers can be packed tightly without interfering with each other

OFDM sub-carriers fall off faster at the band edges

OFDM Concept


FEC = Forward Error Correction

LDPC = Low Density Parity Check Invented by Robert Gallager in 1962 Could not be implemented in HW until recently Much more robust than Reed-Solomon

LDPC FEC


HFC Plant has at least 8 dB variation in CNR across plant

Multiple profiles allow operators to leverage SNR variation to improve system capacity

Example with 4 profiles A. Worst (mostly QAM256) B. Average (mostly QAM1K) C. Better (mostly QAM2K) D. Best (mostly QAM4K)

Downstream Profiles QAM4K Anyone?


OFDM/3.1 gives more Bits/Hz at the same CNR & operating conditions than 3.0

OFDM - More for less


6.3 6.38.6

10.5

Bits/Hz

CNR35 dB 41 dB

35% Efficiency gain 3.1 vs. 3.06.3 Max Bits/Hz on 3.010.5 Max Bits/Hz on 3.1 w/ QAM 40968.5 Typical Bits/Hz on 3.1 w/mixed QAM (256~4096)

PLC: (Physical Link Channel) all necessary information to decode and use the OFDM Signal – your passport

NCP: (Next Codeword Pointer) provides the modems with which Code Words (CW) are present and on each profile which CW to use

Profile A: used for Boot Profile - No profile A no 3.1. All 3.1 modems will use Profile A

OFDM: Information about the overall OFDM channel AvgPower, MER, and Noise

Profiles B, C and D: Provide higher modulations for greater efficiency

Building Blocks in Details


OFDM Overall Level, MER, ICFR, Echo

PLC (Physical Link Channel) Level, MER, CWE and UCWE

NCP (Next Codeword Pointer) Level, MER, CWE, and UCWE

Profiles A, B, C, D MER, CWE, and UCWE

OFDM Measurements


PLC needs to be locked

U CWE (Uncorrectable CWE): 0

MER > 15 dB (QAM16 OFDM)

Level > -15 dBmV

C CWE (Correctable CWE): Should be 0 but as long as they are corrected, it is okay

Test 1: PLC (Phy Link Channel)


PLC

NCP needs to be locked


MER > 15 dB (QAM16 OFDM)

Level > -15 dBmV


Test 2: NCP (Next Codeword Pointer)


NCP

CW start at low end and populate up

NCP start at high end and populate down

NCP lives here

Profile A needs to be locked


MER > 27 dB (please note – average MER)


IMPORTANT: If Profile A has not achieved locked or gets U CWE, modems will roll back to 3.0 > Look for Profile A performances if modem only locks in 3.0 mode

Test 3: Profile A


Profile A

Average Level > -6 dBmV

ICFR < 2 dB Peak to Peak

MER Average > 36 dB

MER Standard Deviation < 2 dB

MER @ 2nd Percentile > 35 dB

Test 4: OFDM Overall


OFDM

Modulation Min CNR/MER Mini Avg Power

QAM4096 41 dB -6 dBmV





Profile needs to be locked

U CWE (Uncorrectable CWE) and CWE (Correctable CWE): varies

MER see table per profile

Test 5: Profiles B, C, D


Modulation Min CNR/MER Mini Avg Power






Profile B, C, D, ....

Lock onto primary

Verify Bonding of SC QAM and OFDM on the Forward

Verify Bonding on the Return

Verify Average Power

Verify Upstream TX

Service Level Testing


Perform OFDM verification

Service Level Testing


Check bonded channels for any errors

PING for connectivity

VeTEST for Throughput testing both at RF port or Ethernet Port

PING and VeTEST


Using Spectrum to find Noise under OFDM


OFDM 96 MHzRunning clean

Noise Detected @ NCPWill cause modems to switch to 3.0

Example of Migration Plan

3.1 | Bootcamp 26

Backward Compatibility Support at least 24 bonded SC-QAM in downstream and 8 in upstream S-CDMA in the upstream DOCSIS 3.1 CM required to operate on DOCSIS 3.0 CMTS DOCSIS 3.1 CMTS required to support DOCSIS 3.0 (and 2.0) CM

Operation on existing HFC Networks Upstream spectrum remains below downstream Supports operation with existing upstream splits, 42/65MHz as in most operation, 85MHz

as specified in DOCSIS 3.0 Support spectrum evolution 200 MHz on upstream 1.2/1.7 GHz on downstream Support the ability to take advantages of enhanced capabilities when Network, Headend

and CPE permit

D3.1 Technology Migration


Current State: DOCSIS 3.0 CMTS or CCAP and 3.0 CM growth

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54/85 MHz

750MHz

5MHz

42/65MHz

Downstream

860MHz

1,000

MHz

20MHz

1-4 LD Channels

1-24/32 LD Channels

. . . . . .

D3.0 CM(NxM LD)

D2.0 CM(1x1 LD)

D2.0 CM(1x1 LD)

D1.0/1.1 CM

(1x1 LD)

D1.0/1.1 CM

(1x1 LD)

• May have 1.0/1.1 LD CMs (need 3.2 MHz 16-QAM channel)• More 3.0 LD CMs and GWs• More LD US and DS carriers and channel bonding

D3.0 CM(NxM LD)

Operating ModeLegacy DOCSIS LDDOCSIS 3.1 3.1

CCAP or CMTS

DOCSIS 3.0 (LD)

Upstream

LegacyOOB DS

Legacy OOB US

Out-of-BandMotorolaCisco

3.1 | BootcampCONFIDENTIAL

54/85 MHz

750MHz

5MHz

42/65MHz

Downstream

When 3.1 available: Begin deploying 3.1 CPEs in LD mode

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860MHz

1,000

MHz

20MHz

1-4 LD Channels

1-24/32 LD Channels

. . . . . .

D3.0 CM(NxM LD)

D2.0 CM(1x1 LD)

D2.0 CM(1x1 LD)

D1.0/1.1 CM

(1x1 LD)

D1.0/1.1 CM

(1x1 LD)

• May remove 1.0/1.1 LD CMs• Lots of 3.0 LD CMs and GWs• More LD US and DS carriers• May deploy S-CDMA• Begin deploying 3.1 CMs

D3.0 CM(NxM LD)


CCAP or CMTS

DOCSIS 3.0 (LD)

Upstream

LegacyOOB DS

Legacy OOB US


D3.1 CM(NxM LD)

D3.1 CM(NxM LD)


Future: Deploy 3.1 DS & US in Existing Split

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D3.1 CM(NxM LD +

3.1)

D3.1 CM(NxM LD +

3.1)

D2.0 CM(1x1 LD)

D2.0 CM(1x1 LD)

D3.0 CM(NxM LD)

D3.0 CM(NxM LD)

• Removed 1.0/1.1 LD CMs; no need for TDMA LD US channels• Begin deploying 3.1 CCAP: new blade or firmware update to 3.1 DS and US blade

• For MHA architecture, new EQAMs might be firmware upgradeable to 3.1 DS blades• Begin using OFDMA for 3.1 US and/or OFDM for 3.1 DS (don’t have to deploy together)

• Overlay 3.1 on current US spectrum with LD US, filling gaps and using logical channels• Use open spectrum for 3.1 DS OFDM channels in existing DS spectrum



CCAPDOCSIS 3.1

54/85 MHz

750MHz

5MHz

42/65MHz

Downstream

860MHz

1,000

MHz

20MHz

1-4 LD Channels

1-24/32 LD Channels

. . . . . .

Upstream

LegacyOOB DS

Legacy OOB US

OFDMA 3.1 OFDM 3.1 OFDM 3.1


Long Term: 3.1 CCAP w/more DS and/or US capacity

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3.X CCAPDOCSIS 3.X

D2.0 CM(1x1 LD)

D2.0 CM(1x1 LD)

D3.0 CM(NxM LD)

D3.0 CM(NxM LD)

100-240 MHz

750MHz

5MHz

85-200MHz

DownstreamUpstream

20MHz

TBD

OFDM 3.1

• Expand 3.1 US and/or DS capacity as feasible and required• Move OOB carriers; assess impact on existing STBs above 54 MHz• Use OFDM and OFDMA more extensively• Only use OFDM in new spectrum

. . . . . .

1-24/32 LD Channels


D3.1 CM(NxM LD +

3.1)

D3.1 CM(NxM LD +

3.1)

1-8 LD Channels

OFDM 3.1

860MHz

1,000

MHz

1,200

MHz

OFDM 3.1

LegacyOOB DS

Legacy OOB US


OFDMA 3.1


Questions???

Tony HolmesTel: (317) [email protected]

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Download - Are You Ready for DOCSIS 3.1

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