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802.11ac Basics

802.11ac BasicsSpeaker Name Jerome HenrySpeaker Title Technical Marketing EngineerDate Summer 2013Cisco Confidential 2011 Cisco and/or its affiliates. All rights reserved.# 2011 Cisco and/or its affiliates. All rights reserved.Cisco Confidential#Recap: from 802.11a/g to 802.11n802.11a/g use , BPSK, QPSK, 16-QAM or 64-QAM64 small waves (called Carriers, or Tones)No relationship between 64 carriers and 64 in 64-QAMSome carriers are not used for data:48 data subcarriers (in green)4 pilot subcarriers (in red) for synchronization and tracking12 zero subcarriers (in black) for calibration on sides and center

Inside each carrier, symbols are separated by silences (guard intervals), and some of them are repeated

000 000000 001000 011000 010001 001011 001010 001001 011011 011010 001001 010011 010010 010001 000010 000011 000100 010111 000101 000100 000110 000110 001111 001101 001100 001100 011101 011111 011110 011101 010111 010110 010110 100000 100001 100011 100010 100010 101011 101001 101000 101010 111011 111001 111000 111010 110011 110001 110000 110110 110111 110101 110100 110110 111111 111101 111100 111110 101111 101101 101100 101111 100101 100100 10064-QAM110 110001 101100 010110 110001 101100 010

ModulationData Rate perCarrier (kb/s)Total Gross Data Rate (Mb/s)Repeat ratioTotal Net Data Rate (Mb/s)64-QAM1125721/34864-QAM1125721/454 2011 Cisco and/or its affiliates. All rights reserved.Cisco Confidential#Recap: from 802.11a/g to 802.11n802.11n aggregates two carriers to more than double the speed: 128 subcarriers14 zero subcarriers (vs. 12) for calibration on sidesand center6 pilot subcarriers (vs. 4) for synchronization andtracking108 data subcarriers (vs. 48)54 Mb/s to 108+11 = 119 Mb/sUsable only in the 5GHz band802.11n also allows several co-existing radios on the same frequency (MIMO)Up to 4 radios, to receive and / or to send:

abcdefdefabcMIMO AP

Sending side: send more symbols, in parallel (spatial multiplexing)abcabcabcMIMO AP

Sending side: synchronize signals for better resulting signal at receiving end (Transmit Beamforming, TxBF, ClientLink)abcabcabcMIMO AP

Receiving side: synchronize signals for better signal (Maximal Ration Combining, MRC) 2011 Cisco and/or its affiliates. All rights reserved.Cisco Confidential#802.11n Max Speeds (Modulations Coding Schemes MCS), MbpsSpatial StreamsData rate (20 MHz channel, 800 ns GI)Data rate (20 MHz channel, 400 ns GI)Data rate (40 MHz channel, 800 ns GI)Data rate (40 MHz channel, 400 ns GI)165.572.21351502130144.42703003195216.74054504260288.8540600 2011 Cisco and/or its affiliates. All rights reserved.Cisco Confidential#802.11n Max Speeds (Modulations Coding Schemes MCS), Mbps, 1 SSMCSModulationRatio20 MHz channel40 MHz channel

800 ns GI400 ns GI800 ns GI400 ns GI0BPSK1/26.57.213.5151QPSK1/21314.427.302QPSK3/419.521.740.545316-QAM1/22628.95460416-QAM3/43943.38190564-QAM2/35257.8108120664-QAM3/458.565121.5135764-QAM5/66572.2135150 2011 Cisco and/or its affiliates. All rights reserved.Cisco Confidential#802.11n Cool Stuff That Never Took OffGreenfield header (pure 802.11n, for networks with no 802.11a/b/g stations)RIFS (Reduced Interframe Space, 2 s space for bursts)Antenna selection (implement 8 antennas, use 4)Unequal modulation (e.g. Spatial multiplexing, sending one 64-QAM signal and another BPSK signal)LSIG TXOP protection (802.11n stations reserve bandwidth using legacy frame header space)Dual CTS protection (AP send to CTS when using Space Time Block Coding, STBC, which extends the range of the cell: one CTS for non-STBC stations (short range), and one CTS for STBC stations (longer range))

2011 Cisco and/or its affiliates. All rights reserved.Cisco Confidential#How to get faster than 802.11n: 802.11acIncrease channel width beyond 40 MHzIncrease number of spatial streams more than 4Improve the modulation? Is 64-QAM the best we can do?Better manage the cellWhy would only one device send at a time?If we can have one device send 3 streams at the same time on the same frequency, why not have 3 devices send 1 stream at the same time on the same frequency instead?Why would all devices be on the same frequency?If we can send one 40 MHz signal, why not send two 20 MHz signals instead?

2011 Cisco and/or its affiliates. All rights reserved.Cisco Confidential#802.11ac: Larger Channel, More Streams160 MHz-wide channel widthUp to 160 MHz for APs80 MHz for stations, 160 MHz optionalMore spatial streamsUp to 8 spatial streams8 radio circuits sending or receivingBetter modulation256-QAM (8 bits per symbol vs. 6 bits for QAM-64)Up to 4 times faster

2011 Cisco and/or its affiliates. All rights reserved.Cisco Confidential#802.11ac Max Speeds (Modulations Coding Schemes MCS), Mbps, 1 SSMCSModulationRatio20 MHz channel40 MHz channel

80 MHz channel160 MHz channel800 ns GI400 ns GI800 ns GI400 ns GI800 ns GI400 ns GI800 ns GI400 ns GI0BPSK1/26.57.213.51529.332.558.5651QPSK1/21314.427.3058.5651171302QPSK3/419.521.740.54587.897.5175.5195316-QAM1/22628.95460117130234260416-QAM3/43943.38190175.5195351390564-QAM2/35257.8108120234260468520664-QAM3/458.565121.5135263.3292.5526.5585764-QAM5/66572.2135150292.53255856508256-QAM3/47886.71621803513907027809256-QAM5/6N/AN/A180200390433.3780866.7 2011 Cisco and/or its affiliates. All rights reserved.Cisco Confidential#802.11ac: Mu-MIMO8 spatial streams but many (battery-operated) clients will be 1 SS are we going to waste 7 SS (like we waste 3 SS with 802.11n?)No! With MU-MIMO, up to 4 clients can receive signals at the same time, on the same frequencyEach client has a dedicated spatial streamNo collisions anymoreFull-duplex becomes possibledefabcMIMO AP

2011 Cisco and/or its affiliates. All rights reserved.Cisco Confidential#

802.11ac Dream SpeedThroughput will all depend on stations!Example best case:160 MHz-wide channel, 8 antenna AP with MU-MIMO supportOne 4-SS, 160 MHz client, 3.47 Gbps data rateto this clientOne 2-SS, 160 MHz client, 1.73 Gbps data rate to this clientTwo 1-SS, 160 MHz clients, 867 Mbps data rate to each clientTotal cell throughput, 6.93 Gbps!But in reality, clients are not expectedto support more than 80 MHz (only the APs will support 160 MHz) 2011 Cisco and/or its affiliates. All rights reserved.Cisco Confidential#Lets talk about Encryption

2011 Cisco and/or its affiliates. All rights reserved.Cisco Confidential#WPA2/AES-CCMP?With current WPA2, blocks of 128 bits are encrypted with 128 bit AES/CCMP: 802.11 MAC headerCCMPPayload (data)MICFCSPN part 18 bytesReservedKey IDPacket Number - PN part 24 bytes2 bytes4 bytes1 byte1 byte8 bytes26 / 30(802.11n) bytes01011001 0000000SALengthPN2 bytes6 bytes6 bytes2 bytesCreate a 128 bit Init Block (starting block)You need to calculate the MIC and encrypt the packet in parallel lets look at the MIC:Encrypt with AES (128 bit key)= you get a 128 bit encrypted resultApply an XOR with the first 128 bits of payloadData16 bytesAES Encrypted16 bytesAESXOR Result 16 bytesEncrypt with AES (128 bit key)Apply an XOR with the next128 bits of payloadData16 bytesAES Encrypted16 bytesAESXOR Result 16 bytesRepeat 4 and 5 as you go through the frameXOR is a simple binary operation:You take each bit of data and encrypted block and apply the recipe:0 XOR 0 -> 00 XOR 1 -> 11 XOR 0 -> 11 XOR 1 -> 0 2011 Cisco and/or its affiliates. All rights reserved.Cisco Confidential#WPA2/AES-CCMP?With current WPA2, blocks of 128 bits are encrypted with 128 bit AES/CCMP: 802.11 MAC headerCCMPPayload (data)MICFCS8 bytes4 bytes8 bytes26 / 30(802.11n) bytesOnce you get to the last 128 bits of the payload (with padding if needed):Data16 bytesAES Encrypted16 bytesXOR Result 16 bytesAES Encrypted16 bytesAESAES Encrypted8 bytesTake the 64 most significant bits:thats your unencrypted MIC (TBC) 2011 Cisco and/or its affiliates. All rights reserved.Cisco Confidential#WPA2/AES-CCMP?Congratulation, you have your MIC. Now, lets encrypt the payload: 802.11 MAC headerCCMPPayload (data)MICFCS8 bytes4 bytes8 bytes26 / 30(802.11n) bytes01011001 0000000SALengthPN2 bytes6 bytes6 bytes2 bytesTake your 128 bit Init Block (starting block)Encrypt with AES (128 bit key)= you get a 128 bit encrypted resultApply an XOR with the first 128 bits of payload= you get your first 128 bit payload chunkData16 bytesAES Encrypted16 bytesAESXOR Result 16 bytesIncrement your PN by +1Apply an XOR with the next 128 bits of payloadData16 bytesAES Encrypted16 bytesAESXOR Result 16 bytesRepeat 4 to 6 as you go through the frameEncrypt this new block with AES 2011 Cisco and/or its affiliates. All rights reserved.Cisco Confidential#WPA2/AES-CCMP?Congratulation, you have your MIC. Now, lets encrypt the payload: 802.11 MAC headerCCMPPayload (data)MICFCS8 bytes4 bytes8 bytes26 / 30(802.11n) bytesOnce you get to the last 128 bits of the payload (with padding if needed):XOR Result 16 bytesAES Encrypted16 bytesAESAES Encrypted8 bytesIncrease PN by 1, encrypt the 128 bit Init Block (starting block) XOR with the Unencrypted MICKeep the most significant 64 bitsCongratulations! You have a encryptedpacket with an encrypted MICAES Encrypted8 bytes 2011 Cisco and/or its affiliates. All rights reserved.Cisco Confidential#Whats wrong with WPA2/CCMP?AES CCMP uses blocks of 128 bits, with a 128 bit key:128 bit key is getting a bit light, especially if you want FIPS certification (you will require 256 bit keys at some point)Blocks of 128 bits: with 802.11n A-MPDU max length of 65,535 octets, you may need more than 24 580 calculations to encrypt a frameIf your throughput is about 270 Mbps (3SS 450 Mbps), this represents more than 13 million calculations per second (just to encrypt) Imagine 6.93 Gbps close to 350 million calculations per secondIn their wisdom, the 802.11ac members decided that more efficiency would soon be needed:A first change is that 802.11ac allows for 256 bit keys, even with WPA2/CCMP and 128-bit blocksPacket format and process would stay the same, except that MIC would change from 64 bits (8 bytes) to 128 bits (16 bytes) 2011 Cisco and/or its affiliates. All rights reserved.Cisco Confidential#Whats wrong with WPA2/CCMP?A second change is that AES with Counter Cipher Mode (CCM) with Block Chaining Message Authentication Code (CMAC) Protocol (CCMP) is not the only possible mechanism anymore A new mechanism, AES with GCM with Galois Message Authentication Code (GMAC) Protocol (GCMP) is allowedKey is 128 or 256 bitsBlock can be 128, 192, 256, 384, 512 or 704 bit longA great strength of this mechanism is that you can calculate (still using AES) the different elements needed for the MIC determination in parallel, saving an enormous amount of timeGCMP was recently allowed in 802.11ac, experiments are being made so see how much time is savedGCMP (with 128 bit blocks and key) was already allowed by 802.11ad 2011 Cisco and/or its affiliates. All rights reserved.Cisco Confidential#GCMP, Why is it Faster?You can process some phases of the encryption/authentication in parallel: 802.11 MAC headerGCMPPayload (data)MICFCS8 bytes4 bytes16 bytes26 / 30(802.11n) bytesData16 bytesCut your frames in chunks of 128 bits:Data16 bytesData16 bytesTake a number (IV, usually 0), increment +1 so that you have as many IVs as data chunks:Counter 0 (IV)16 bytesCounter 1 (IV)16 bytesCounter n16 bytesPerform Galois Field multiplication on the counter:GF xGF xGF xGF result 016 bytesGF result 116 bytesGF result n16 bytesWARNING: simplified scheme for educational purpose 2011 Cisco and/or its affiliates. All rights reserved.Cisco Confidential#GCMP, Why is it Faster?The last phase is serial: 802.11 MAC headerGCMPPayload (data)MICFCS8 bytes4 bytes16 bytes26 / 30(802.11n) bytesApply your result to the data chunks:GF result 016 bytesGF result 116 bytesGF result n16 bytesData16 bytesData16 bytesData16 bytesConcatenate the results to get your 16 byte MIC:GHASH 016 bytesGHASH 116 bytesGHASH n16 bytesGHASH 0+116 bytesMIC16 bytes 2011 Cisco and/or its affiliates. All rights reserved.Cisco Confidential#802.11ac: What are we Waiting For?(and why not 20 streams, or 360 MHz-channels?)More streams: its not that easy!Multiple streams reach multiple receiving circuitsDistinguishing one from the other is difficultLarger channel is easier than more streams

2011 Cisco and/or its affiliates. All rights reserved.Cisco Confidential#Lets start with 160 MHz-wide Channels then!Here again, not that easy!Where do I find 160 MHz?One 80 MHz channel in 2.4GHzTwo 160 MHz channels in 5 GHz (with DFS; one without DFS band)802.11ac focuses on 5 GHzEven in 5 GHz, a new protocoldoes not make the spectrumwiderOne great advantage of 802.11ac will be to increase the 5 GHz adoptionBut multiple 802.11ac cell coexistence will be a challengeAnd can you afford 8 radios in your mobile device?

2011 Cisco and/or its affiliates. All rights reserved.Cisco Confidential#160 MHz channel is on the wayIn the US there are currently there are 22/10/5/1 channels with bandwidth 20/40/80/160MHz channelsWith opening up of 5.35-5.47GHz & 5.85-5.925GHz, the number of channels increases to 34/16/8/3If the industry manages to take back the TDWR channels, the number of increases to 37/18/9/4

1441401361321281241201161121081041001651611571531496460565248444036Channel #20 MHz40 MHz80 MHz160 MHzUNII-1UNII-2UNII-2 ExtendedUNII-35250MHz5350MHz5470MHz5725MHz96928884807672681691731771815825MHz5925MHz AvailableTDWR channels, not yet availableTo become availableSpecial OOBE must be met 2011 Cisco and/or its affiliates. All rights reserved.Cisco Confidential#23160 MHz channel is on the wayThe number of channels with 20/40/80/160MHz bandwidth in other countries is currently:EU: 17/8/4/2China: 5/2/1/0 about to expand number of channelsIndia: 13/6/3/1Japan: 19/9/4/2Russia: 16/8/4/1Efforts are underway globally to expand the availability of 5Ghz, including for use by wide 802.11ac channels 2011 Cisco and/or its affiliates. All rights reserved.Cisco Confidential#24Lets build 802.11ac in 2 stepsWFA Wave 1 certification includes only a subset of features:80 MHz is mandatory, 256QAM is optional (but all vendors put it in)Ability to RX 1/2/3SS is tested2SS is mandatory for non-battery-powered APsOnly 1SS is mandatory for battery powered APs and clientsFor Wave 1, the majority of vendors focus on 80 MHz, 1-3SS and 256QAMWave 1 products are based on 11ac D3.0 (May 2012) and started June/July 2013The WFA brand name is Wi-Fi CERTIFIED ac Wave 2 should include: 256QAM, 160MHz, 4SS 3.5Gbps PHY, 2.4Gbps MACFort Wave 2, it is expected that 160 MHz devices appear with 1-3SS for low- to high-end products (data rates of 867-2600 Mbps)Marketing roadmap for Wave 2 has not yet be approvedIn between, 802.11ac draft 5 was recirculated and approved with few commentsAmendment final approval is expected in late 2013

2011 Cisco and/or its affiliates. All rights reserved.Cisco Confidential#How far / How fast can you go with Wave 1?80 MHz, 3 SS => 1.3 Gbps80 MHz, 2 SS => 866.7 Mbps80 MHz, 1 SS => 433.3 Mbps256 QAM is very rewarding, for marketingHowever, noise affects dense signal (high QAM density) more than signal w/lower density1.3 Gbps range is likely to be short!

0459013518022527031504590135180225270315QPSK 16-QAM1000 points mapped, no noise04590135180225270315045901351802252703151000 points mapped, with noise 2011 Cisco and/or its affiliates. All rights reserved.Cisco Confidential#MU-MIMO Efficiency MechanismsChannel sounding for MUTo make efficient use of a channel (and beam form!), stations need to know the channel characteristics they can send test frames [sounding frames] of known structure, which allows the receiver to understand the channel specs, and return them to the sender Industry did not settle on any of the channel sounding mechanisms of 11n, and BF is being done via proprietary mechanisms But for MU-MIMO, a unique sounding mechanism is important, and 11ac community agreed on a single sounding mechanism - Same mechanism is applicable for SU-MIMOACK for MUAP polls each client for ACK. This adds overhead, but is more robust RTS/CTS for MUNo new RTS/CTS mechanism is added for MUBut the spec allows AP for proprietary mechanisms using conventional RTS/CTS 2011 Cisco and/or its affiliates. All rights reserved.Cisco Confidential#27Does MU-MIMO work? Yes, but802.11ac MU MIMO is like 802.11n MIMO, except instead of one client, there are up to four clientsAP does pre-coding for all the clients within the MU group simultaneouslyIn MU precoding, when AP beamforms space-time streams to one client, it simultaneously null-steers those space-time streams to the rest.All users MPDUs are padded to the same number of OFDM symbolsMU-MIMO is technically risky and challenging: Needs precise channel estimation (CSI) to maintain deep nulls Precise channel estimation adds overhead Rate adaptation is more difficult Throughput benefits are sensitive to MU grouping WFA Wave 2 certification: MU-MIMO

Null-steering:To send data to user 1, the AP forms a strong beam toward user 1, shown as the top-right lobe of the blue curve. At the same time the AP minimizes the energy for user 1 in the direction of user 2 and user 3. This is called "null steering" and is shown as the blue notches. Same logic applies to red and yellow beams. 2011 Cisco and/or its affiliates. All rights reserved.Cisco Confidential#28802.11ac / Legacy CoexistenceOne issue of 802.11n is 40 MHz coexistence with 20 MHz channelsB sends on Ch 36 (because it senses 802.11a AP on Ch 40)802.11an AP does CCA on 36,40, hears nothing, transmits40 MHz signal collides at B

36,4040BCollisionon 40802.11n802.11a802.11nCCA: 40 is busy-> use 36 onlyCCA: 36 and 40 clear-> use 36 and 403636+40 2011 Cisco and/or its affiliates. All rights reserved.Cisco Confidential#802.11ac / Legacy CoexistenceThis issue could be a lot worse for 802.11ac:802.11ac can use 20 MHz, 40 MHz (20 MHz primary/secondary), 80 MHz (40 MHz primary/secondary)

36Primary 2040444836Primary 2040444836Primary 2040444836Primary 20404448Free?Secondary 20Free?Secondary 40Secondary 20Secondary 20Primary 40Primary 40 2011 Cisco and/or its affiliates. All rights reserved.Cisco Confidential#802.11ac / Legacy CoexistenceThis issue could be a lot worse for 802.11ac:If secondary20 is busy, transmitter cannot extend to secondary40OBSS (802.11n or 802.11ac) with primary on local AP secondary would cause both APs to block each otherChoice of primary channel is critical for 802.11ac

Best configuration: both primary 20s alignedSecond best: primary 20s far apart (e.g. 36 and 48)

36Primary 20404448Secondary 40Secondary 2036Secondary 20404448Secondary 40Primary 20BlockBlockWastedBlock36 2011 Cisco and/or its affiliates. All rights reserved.Cisco Confidential#Legacy Coexistence - RTS/CTS for wide bandwidth operationWith wide bandwidth options, 802.11ac has made RTS/CTS procedures OBSS friendlyBased on a Cisco proposal, 802.11ac added a bandwidth reservation mechanism to legacy RTS/CTS framesLegacy devices recognize NAV and deferYet, three bits are hidden in scrambling sequence of the legacy PPDU that indicates desired BW that sender wishes to send PPDU withRTS sent on primary channel is duplicated on secondary channels, so that nearby stations belonging to OBSS know about upcoming transmissionThe responder, responds with CTS on primary channel, and it duplicates the CTS frame on some or all of the secondary channelsDepending on capabilities, bandwidth indication could be static or dynamic, where the RTS-sender could narrow the bandwidth to adapt to the condition on the other side 2011 Cisco and/or its affiliates. All rights reserved.Cisco Confidential# Interference at the responder side

Legacy Coexistence - Bandwidth reservationInitiator sends RTS on channels that its senses are freeSubsequent exchange depend on the capabilities of both sidesDynamic bandwidth reservation:Responder sends CTS only on channels that it sense are free. Initiator transmits data only over channels indicated free by CTS responseStatic bandwidth reservation: If the initiator has static capability, the responder sends CTS only if all the requested channels are free, otherwise sends no CTSRTSCTSCTSData transmissionData transmissionRTS is in 20MHz 11a format, but indicates: (1) 80MHz BW, (2) initiator is capable of dynamic BWCTS is in 20MHz 11a format, but indicates 40MHz BWExample of DynamicBandwidth Reservation WFA Wave 1 certification: RTS with BW signaling is optional CTS with BW signaling in response to RTS with BW signaling is a mandatory test

RTSRTSRTS 2011 Cisco and/or its affiliates. All rights reserved.Cisco Confidential#332 Last details - Power SavingThere has been debates on how to reduce processing in a station for the frames that are not addressed to the station, especially with large frames Three fields in 11ac physical header (PLCP) allow for power saving:Partial Association ID (PAID): A station receiving a unicast frame (or rather PPDU) with PAID not matching its own is allowed to stop receiver processingGroup ID (GID): AP announces ahead of time what stations belong to a MU GID. In a MU PPDU, those clients that do not belong to the GID in PLCP may drop the MU PPDU.TXOP PS: AP indicates to clients if there are no more MPDUs for them in the remaining of a TXOP and those clients may go to power save. This has some overhead for AP, but AP can disallow TXOP PS entirely. TXOP PS is not a popular features for AP vendors and they are not tested in WFA Wave 1 certificate.

2011 Cisco and/or its affiliates. All rights reserved.Cisco Confidential#342 Last Details - All A-MPDU in 11acIn 11ac, all PPDUs are in form of AMPDUVery large payloads are possible in 11ac (up to 1,048,575 octets!),The goal is to maintain efficiency: same amount of bytes is transmitted in less time, which increases the relative percentage of IFS and header overheadAt the same time, longer frames means longer header, if signaling the length of the PSDU in bytesAlternative is to signal the number of OFDM symbols, which is an AMPDU formatBut AMPDU with single MPDU (and necessary padding if needed) is allowed

WFA Wave 1 certification: AMPDU aggregation is a mandatory testRX AMPDU of AMSDU is an optional test802.11acACK802.11acHeaderPacket802.11acHeaderPacket802.11acHeaderPacket802.11nACK802.11nHeaderPacketPacketPacket802.11nHeaderPacket802.11nACKStandard frameA-MSDUA-MPDUMPDUMSDU 2011 Cisco and/or its affiliates. All rights reserved.Cisco Confidential#35SummaryWhat to Expect in Wave 1Clients are already out there, all supporting 80 Mhz (and 256-QAM)Broadcom (4335:1SS, 256-QAM, 433.3 Mbps and 4352:2 SS, 256-QAM, 867 Mbps)Marvell (Avastar 88W8897: 2 SS, 256-QAM, 867 Mbps)Qualcomm (WCM3680: 1 SS, 256-QAM, 433.3 Mbps, QCA9862: 2 SS, 256-QAM, 867 Mbps)Mediatek (MT7610 and MT7650: 1 SS, 256-QAM, 433.3Mbps)Redpine (RS9117: 1 SS, 256-QAM, 433.3Mbps)Intel (Wilkins Peak 2: 2 SS, 256-QAM, 867 MbpsAPs are coming out too, including the 802.11ac module for the 3600 (3 SS, 80 MHz, 256 QAM, 1.3 Gbps)First issues might be collisions with legacy systems, I do not get the speed written on the box, and my non-certified client cannot communicate with your AP 2011 Cisco and/or its affiliates. All rights reserved.Cisco Confidential#36How does it look like Beacon capture

2011 Cisco and/or its affiliates. All rights reserved.Cisco Confidential#

How does it look like Beacon captureBecause Wave 1Su = single UserMU = Multiple User 2011 Cisco and/or its affiliates. All rights reserved.Cisco Confidential#

How does it look like Beacon captureToo many MCS/SS to list them all!802.11ac adopts a coding technique :Bits 0-1 represent 1 SSBits 2-3 represent 2 SSEtc, bits 14-15 represent 8 SSThen, for each group:0 indicates support for VHT-MCS 0-7 for n spatial streams1 indicates support for VHT-MCS 0-8 for n spatial streams2 (10) indicates support for VHT-MCS 0-9 for n spatial streams3 (11) indicates that n spatial streams is not supported

2011 Cisco and/or its affiliates. All rights reserved.Cisco Confidential#How does it look like Beacon capture

No GCMP in wave 1 2011 Cisco and/or its affiliates. All rights reserved.Cisco Confidential#Q2 12Chip vendor Plug-fests BeginFeb 12802.11acDraft 2ApprovedQ4 13802.11acIEEERatificationMay 12802.11acDraft 3Q1 13802.11acIEEEFinal Letter Ballot/First sponsor ballotCisco Confidential For NDA use only, not for further disclosure or distributionQ1 14EstimatedWave 2 industry CertificationQ1Q2Q3Q4Q1Q2Q3Q4Q1Q2Q3Q4201220132014Q1 13Wave 1 industry Certification802.11ac Technology Timelines (Estimates) 2011 Cisco and/or its affiliates. All rights reserved.Cisco Confidential#Cisco Confidential For NDA use only, not for further disclosure or distributionQ1Q2Q3Q4Q1Q2Q3Q4Q1Q2Q3Q42012201320141st Gen .11acSmartphonesTablets(1x1, 2x2)Broader.11ac client adoption & proliferationConsumerClass APsLinksys, NetGear,D-LinkAP3600802.11acWave 1ModuleQ1 13EstimatedWave 1 industry CertificationMobile chips will be optimized for lower power consumption to allow 5GHz/11ac support Post-iPhone 5 and other smartphones in CY13 will likely be 11ac capableHTC already has a model available Higher powered Tablets will be 11ac enabled in CY13802.11ac Technology Timelines (Estimates) 2011 Cisco and/or its affiliates. All rights reserved.Cisco Confidential#Thank you. 2011 Cisco and/or its affiliates. All rights reserved.Cisco Confidential#TP Chart0.62.785.988.210.464.681.094.277.9310.361.238.251.756.0910.4712.783.2313.092.798.0512.716.065.317.443.8310.031519.018.1421.594.9412.2417.4822.3311.2126.526.6314.2220.5625.891530.198.4816.1523.5130.0718.7134.119.7918.4826.3833.9122.2340.1911.4420.9630.1238.6425.7445.1513.4423.2233.6343.0329.5651.0915.1125.8337.5347.8333.4856.3717.1429.2142.0253.9539.0461.819.5732.2646.0760.1343.1968.5121.5335.1652.0465.6247.1177.3123.5938.9857.0672.4252.3585.926.6243.162.5977.8458.3195.0729.4446.1667.4886.0464.67103.4831.3350.874.1995.3570.23111.4934.4854.9281.65104.377.25118.7238.2558.0588.19110.3685.11127.7341.0762.2895.64117.5692.02139.643.5567.12102128.6499.02149.1246.372.21106.45138.62105.33160.948.4878.89111.49149.21109.95179.0149.7986.1118.17157.33114.1195.2151.291.27125.31163.88116.62208.6352.0696.05132.97170.42118.75221.4953.06100.45140.65178.71120.35229.6853.52102.83147.32187.03120.82234.5953.62104.93153.64195.51121.05238.5753.76106.35157.05203.05121.24241.0553.92106.92159.33207.4121.34242.253.95107.4161.03211.15121.39242.8853.99107.83161.81213.38121.49242.9854107.84162214.72121.524354107.98162215.33121.524354108162215.76121.524354108162215.98121.524354108162215.96121.524354108162216121.5243

1x1 - 20 MHz2x2 - 20 MHz3x3 - 20 MHz4x4 - 20 MHz1x1 - 40 MHz2x2 - 40 MHzRange (m)OTA Throughput (Mbps)Throughput

TP-Data20 MHz40 MHzAntenna Gain (dB)017.1620.64Tx PWR (mW)100snr dBRange (m)Range (m)Rx Noise Figure (dB)101x1 - 20 MHz2x2 - 20 MHz3x3 - 20 MHz4x4 - 20 MHz1x1 - 40 MHz2x2 - 40 MHzFreq (GHz)5074.230.62.785.988.2159.020.464.68Free Space BP (m)1169.501.094.277.9310.3655.261.238.25Exponent3.5265.081.756.0910.4712.7851.753.2313.09360.932.798.0512.716.0648.455.317.44Tx OFDM Symb Energy (mJ)3.20E-04457.063.8310.031519.0145.378.1421.59Rx Noise PSD (mW/Hz)3.98E-17553.424.9412.2417.4822.3342.4811.2126.52650.026.6314.2220.5625.8939.771530.19Path G @ 1 m (dB)-46.42746.848.4816.1523.5130.0737.2418.7134.11TSNR @ 1 m (dB)82.63843.859.7918.4826.3833.9134.8722.2340.19TSNR @ BP (dB)82.63941.0611.4420.9630.1238.6432.6525.7445.151038.4513.4423.2233.6343.0330.5729.5651.091136.0015.1125.8337.5347.8328.6233.4856.371233.7117.1429.2142.0253.9526.8039.0461.81331.5619.5732.2646.0760.1325.1043.1968.511429.5521.5335.1652.0465.6223.5047.1177.311527.6723.5938.9857.0672.4222.0052.3585.91625.9126.6243.162.5977.8420.6058.3195.071724.2629.4446.1667.4886.0419.2964.67103.481822.7131.3350.874.1995.3518.0670.23111.491921.2734.4854.9281.65104.316.9177.25118.722019.9138.2558.0588.19110.3615.8385.11127.732118.6541.0762.2895.64117.5614.8392.02139.62217.4643.5567.12102128.6413.8899.02149.122316.3546.372.21106.45138.6213.00105.33160.92415.3148.4878.89111.49149.2112.17109.95179.012514.3349.7986.1118.17157.3311.40114.1195.212613.4251.291.27125.31163.8810.67116.62208.632712.5652.0696.05132.97170.429.99118.75221.492811.7653.06100.45140.65178.719.35120.35229.682911.0253.52102.83147.32187.038.76120.82234.593010.3153.62104.93153.64195.518.20121.05238.57319.6653.76106.35157.05203.057.68121.24241.05329.0453.92106.92159.33207.47.19121.34242.2338.4753.95107.4161.03211.156.73121.39242.88347.9353.99107.83161.81213.386.30121.49242.98357.4254107.84162214.725.90121.5243366.9554107.98162215.335.53121.5243376.5154108162215.765.17121.5243386.0954108162215.984.85121.5243395.7154108162215.964.54121.5243405.34541081622164.25121.5243

Select 4x4-200.40.060.480.0200000.04000000000000000000000000.2100.570.1200000.1000000000000000000000000.0800.410.3400000.1300.02000000.020000000000000000.0100.270.3600000.100.22000000.04000000000000000000.030.250.030000.1200.52000000.05000000000000000000.010.090.060000.0300.670.0700000.0100.05000000.0100000000000.030.08000000.560.2500000.0100.06000000.01000000000000.050.0100000.320.490.01000000.12000000000000000000.010.0400000.140.530.08000000.160.020000000.0200000000000.0500000.010.380.23000000.220.090000000.0200000000000.01000000.20.47000000.10.190000000.03000000000000000000.510.0200000.080.290.04000000.06000000000000000000.30.2000000.350.07000000.060.02000000000000.0100000.080.35000000.330.19000000.030.01000000000000.03000000.55000000.190.21000000.0100.0100000000000.01000000.620.0300000.010.220.090000000.0200000000000000000.530.13000000.160.13000000.010.0400000000000000000.270.280.0300000.10.290000000.0300000000000000000.010.250.1200000.090.48000000.010.030.0100000000000000000.160.200000.010.50.07000000.040.0200000000000000000.030.16000000.640.13000000.020.0200000000000000000.010.16000000.450.250.100000.010.02000000000000000000.07000000.330.410.15000000.030.0100000000000000000.02000000.10.540.3000000.020.0200000000000000000000000.030.370.55000000.020.020.0100000000000000000000000.160.74000000.010.070.0200000000000000000000000.080.680000000.210.0300000000000000000000000.020.60000000.310.07000000000000000000000000.410000000.40.19000000000000000000000000.250000000.420.33000000000000000000000000.10000000.390.51000000000000000000000000.050000000.260.69000000000000000000000000.030000000.150.82000000000000000000000000.010000000.080.910000000000000000000000000000000.070.930000000000000000000000000000000.030.970000000000000000000000000000000.010.9900000000000000000000000000000001000000000000000000000000000000010000000000000000000000000000000100000000000000000000000000000001

012345678910111213141516171819202122232425262728293031SNR (dB)4x4 - 20 MHz - MCS Selection

d-1x1-20snr dBMCS SelectionTPTP-SDPERPER-SD0123456700.61.630.89960.2712|1000000011.092.350.83740.3456|0.970.010.020000021.752.830.7390.399|0.960.010.030000032.793.540.62410.4265|0.900.10000043.834.260.52580.4637|0.8300.160.01000054.944.610.430.4449|0.740.010.230.02000066.635.070.32170.3953|0.6200.290.09000078.485.410.21110.3294|0.490.010.350.130.0200089.795.620.15680.308|0.390.010.40.170.03000911.445.920.14070.2642|0.1900.550.140.120001013.446.080.10820.2016|0.1100.490.230.160.01001115.116.330.06130.1652|0.100.40.270.210.02001217.146.840.06210.103|0.0600.360.160.360.06001319.577.690.04060.0763|0.0300.290.160.410.11001421.537.840.05490.0832|0.0300.170.160.450.170.0201523.598.140.05830.0957|0.0100.110.110.530.210.0301626.628.870.04210.0677|000.090.050.510.260.0901729.449.720.02970.0534|000.060.050.430.30.150.011831.3310.390.03550.0843|000.050.030.350.380.150.041934.4810.850.03230.0552|000.020.010.340.310.210.112038.2510.910.05190.0798|0000.010.210.280.330.172141.0710.570.03530.0602|00000.150.290.290.272243.559.810.02910.052|00000.090.280.230.42346.38.870.03380.0563|00000.060.130.330.482448.488.050.01730.0312|00000.060.060.30.582549.797.140.02210.0569|00000.010.090.220.682651.25.530.01520.0332|00000.010.050.140.82752.064.660.01770.0448|000000.030.090.882853.062.760.00550.0167|000000.010.080.912953.521.670.00240.0093|0000000.060.943053.621.440.00030.0017|0000000.060.943153.761.090.00120.0074|0000000.030.973253.920.60.00030.0017|0000000.010.993353.950.440.0010.0082|000000013453.990.050.00010.001|000000013554000|000000013654000|000000013754000|000000013854000|000000013954000|000000014054000|00000001

d-2x2-20snr dBMCS SelectionTPTP-SDPERPER-SD012345678910111213141502.782.980.57510.4315|0.940.030.03000000000000014.273.540.40640.4354|0.860.020.110.0100000000000026.093.860.26290.3615|0.670.060.250.0100000.01000000038.053.970.170.2883|0.450.040.470.0300000.010000000410.034.340.11710.2207|0.270.010.530.130.010000.050000000512.244.330.07310.1222|0.150.030.490.280.020000.0100.0200000614.224.270.05270.0878|0.0800.410.420.05000000.0400000716.154.550.03860.0713|0.0500.250.430.150000.0500.0700000818.484.980.04560.0733|000.190.320.30.01000.0500.120.010000920.965.270.03560.0569|000.120.230.450.03000.0100.130.0300001023.225.680.03630.0747|000.030.150.470.12000.0300.170.0300001125.836.290.05210.087|0000.060.470.240.0100.0200.140.040.020001229.216.480.05950.0846|0000.010.290.430.020000.140.080.030001332.266.660.03270.0621|00000.130.520.030.01000.180.070.060001435.167.390.04610.077|00000.050.510.080.02000.130.050.160001538.988.860.05390.0782|00000.010.350.170.05000.080.090.230.02001643.19.090.04020.0691|000000.190.240.12000.060.060.30.03001746.168.040.04170.0638|000000.10.210.26000.010.060.330.03001850.87.550.04520.0603|000000.030.150.4400000.260.110.0101954.929.410.0280.0503|000000.010.10.4700000.190.210.0202058.0510.540.03260.0624|0000000.020.400000.20.350.020.012162.2812.130.03780.0598|0000000.010.3800000.090.430.070.022267.1214.110.03710.058|00000000.2900000.050.490.140.032372.21160.04590.0704|00000000.2300000.010.440.260.062478.8916.680.05230.0681|00000000.13000000.360.380.132586.115.930.04170.0547|00000000.07000000.240.470.222691.2715.350.02970.051|00000000.06000000.150.430.362796.0513.740.03080.0531|00000000.01000000.110.380.528100.4510.380.02170.036|00000000.01000000.040.280.6729102.839.070.01580.0306|00000000.01000000.020.190.7830104.936.710.01020.0282|00000000000000.010.140.8531106.354.850.00420.0112|00000000000000.010.070.9232106.924.040.00470.0226|000000000000000.050.9533107.42.450.00340.0139|000000000000000.020.9834107.831.210.00050.0022|000000000000000.010.9935107.841.160.00150.0107|000000000000000136107.980.150.00020.0014|000000000000000137108000|000000000000000138108000|000000000000000139108000|000000000000000140108000|0000000000000001

d-3x3-20snr dBMCS SelectionTPTP-SDPERPER-SD0123456789101112131415161718192021222305.983.890.26420.3809|0.690.070.220.0100000.0100000000000000017.934.070.16810.298|0.480.040.430.0300000.02000000000000000210.474.160.10430.1762|0.260.010.530.1500000.0300.020000000000000312.74.140.05330.0901|0.1300.490.260.010000.0600.0500000000000004154.30.06240.0946|0.030.010.340.390.010000.0600.15000000.010000000517.484.330.04420.0691|000.140.390.090000.120.010.23000000.020000000620.564.690.04720.0748|000.050.250.160.01000.0500.380.0400000.0500.0100000723.515.180.05080.0821|000.020.130.190.0100000.470.1400000.0200.0200000826.385.590.04870.0802|000.010.030.150.0500000.480.220.03000000.0300000930.126.790.0450.0772|0000.010.060.1400000.350.30.07000000.07000001033.637.140.05050.0771|00000.010.180.010000.220.30.19000000.09000001137.536.790.04630.0662|00000.010.180.010000.040.320.32000000.12000001242.027.080.04420.0663|00000.010.140.010.010000.160.520.0400000.090.0200001346.078.630.05740.0738|000000.060.040.020000.050.560.1100000.080.070.010001452.049.940.04770.0635|0000000.070.030000.010.510.2600000.020.090.010001557.0610.480.04060.0652|0000000.030.0800000.360.400000.010.060.060001662.5911.480.03480.0563|000000.0100.100000.180.490.0400000.080.10001767.4811.540.05410.0801|00000000.0900000.050.570.1400000.050.10001874.1911.980.03520.0482|00000000.0400000.020.560.220.040000.020.10001981.6513.760.04680.0616|00000000.0300000.010.350.380.1200000.070.04002088.1914.470.03370.0536|00000000000000.160.330.2500000.190.07002195.6413.030.04490.0621|00000000000000.030.320.4400000.090.110.0102210211.650.02550.0418|000000000000000.290.500000.050.10.06023106.4511.90.02360.04|00000000000000.010.140.600000.010.140.1024111.4913.180.02740.0524|000000000000000.060.6400000.010.070.20.0225118.1717.20.03130.0524|000000000000000.030.5000000.10.280.0926125.3119.450.02660.0441|000000000000000.020.44000000.020.370.1527132.9719.780.03380.0511|000000000000000.010.280000000.460.2528140.6519.360.02960.0489|0000000000000000.07000000.110.40.4229147.3216.430.0280.042|0000000000000000.04000000.040.340.5830153.6411.740.01910.0321|0000000000000000000000.020.240.7431157.058.980.00970.0186|0000000000000000.010000000.160.8332159.335.840.00660.0164|00000000000000000000000.090.9133161.032.590.0060.016|00000000000000000000000134161.810.70.00120.0043|00000000000000000000000135162000|00000000000000000000000136162000|00000000000000000000000137162000|00000000000000000000000138162000|00000000000000000000000139162000|00000000000000000000000140162000|000000000000000000000001

d-4x4-20snr dBMCS SelectionTPTP-SDPERPER-SD01234567891011121314151617181920212223242526272829303108.213.690.1670.257800.40.060.480.0200000.0400000000000000000000000110.363.50.09950.164910.2100.570.1200000.100000000000000000000000212.783.520.07210.116120.0800.410.3400000.1300.02000000.02000000000000000316.064.170.04750.071330.0100.270.3600000.100.22000000.04000000000000000419.014.10.06120.09114000.030.250.030000.1200.52000000.05000000000000000522.333.630.07150.09645000.010.090.060000.0300.670.0700000.0100.05000000.010000000625.894.70.04880.078960000.030.08000000.560.2500000.0100.06000000.010000000730.075.370.04490.074700000.050.0100000.320.490.01000000.120000000000000833.915.370.04540.0713800000.010.0400000.140.530.08000000.160.020000000.0200000938.6460.04190.06399000000.0500000.010.380.23000000.220.090000000.02000001043.036.210.04860.070810000000.01000000.20.47000000.10.190000000.03000001147.835.550.04310.0588110000000000000.510.0200000.080.290.04000000.06000001253.958.160.04860.0677120000000000000.30.2000000.350.07000000.060.0200001360.138.860.04540.06131300000000.0100000.080.35000000.330.19000000.030.0100001465.628.010.0340.05641400000000.03000000.55000000.190.21000000.0100.010001572.428.310.04160.07061500000000.01000000.620.0300000.010.220.090000000.020001677.8411.440.0310.05541600000000000000.530.13000000.160.13000000.010.040001786.0413.510.0490.06761700000000000000.270.280.0300000.10.290000000.030001895.3512.720.05490.06931800000000000000.010.250.1200000.090.48000000.010.030.010019104.311.220.03690.048319000000000000000.160.200000.010.50.07000000.040.020020110.3612.020.02010.035720000000000000000.030.16000000.640.13000000.020.020021117.5616.040.03690.058421000000000000000.010.16000000.450.250.100000.010.020022128.6419.010.02780.0428220000000000000000.07000000.330.410.15000000.030.01023138.6217.680.04970.0608230000000000000000.02000000.10.540.3000000.020.02024149.2115.420.03430.0437240000000000000000000000.030.370.55000000.020.020.0125157.3313.540.02920.03852500000000000000000000000.160.74000000.010.070.0226163.8813.910.02560.03822600000000000000000000000.080.680000000.210.0327170.4215.440.02270.03612700000000000000000000000.020.60000000.310.0728178.7117.630.0280.037428000000000000000000000000.410000000.40.1929187.0319.360.02690.037229000000000000000000000000.250000000.420.3330195.5118.390.02840.037630000000000000000000000000.10000000.390.5131203.0516.180.01960.027731000000000000000000000000.050000000.260.6932207.414.140.01620.031932000000000000000000000000.030000000.150.8233211.1510.480.01130.026733000000000000000000000000.010000000.080.9134213.387.30.00450.0136340000000000000000000000000000000.070.9335214.724.540.00260.0078350000000000000000000000000000000.030.9736215.333.20.0020.0101360000000000000000000000000000000.010.9937215.761.290.00110.006370000000000000000000000000000000138215.980.210.00010.001380000000000000000000000000000000139215.960.30.00020.00143900000000000000000000000000000001402160004000000000000000000000000000000001

d-1x1-40snr dBMCS SelectionTPTP-SDPERPER-SD01234567891011121314151617181920212223242526272829303100.462.010.96560.1486|1000000011.233.280.90880.243|1000000023.235.210.76940.3617|0.9900.010000035.36.580.63390.4309|0.9700.030000048.147.520.48920.4396|0.8800.1200000511.218.770.37770.4215|0.7600.230.0100006159.560.27870.3689|0.5700.420.010000718.719.320.18620.2938|0.4100.550.040000822.239.190.0920.2016|0.300.610.080.01000925.749.650.05640.1262|0.2200.580.160.040001029.5610.120.06080.1066|0.100.560.240.10001133.4811.160.05920.0948|0.0500.510.160.280001239.0412.330.05740.0982|0.0100.370.170.430.02001343.1912.220.05230.0904|000.250.150.580.02001447.1112.920.04170.0763|000.190.130.590.09001552.3513.810.04180.0741|000.110.080.630.170.0101658.3115.030.04640.0772|000.060.020.590.310.0201764.6716.20.04370.0769|000.0200.510.40.0701870.2317.960.03880.0736|0000.010.420.420.140.011977.2519.840.04520.0725|00000.290.430.230.052085.1121.410.0380.0614|00000.220.320.350.112192.0221.840.04990.0736|00000.120.280.380.222299.0220.460.04080.0639|00000.060.230.370.3423105.3318.240.02810.0478|00000.050.120.360.4724109.9516.170.02260.0488|00000.020.090.310.5825114.112.250.01810.0305|00000.010.040.230.7226116.629.720.01570.0533|000000.010.20.7927118.755.430.00960.0214|0000000.120.8828120.353.350.00390.014|0000000.050.9529120.822.620.00230.0101|0000000.030.9730121.052.320.00040.0028|0000000.030.9731121.241.60.0010.0073|0000000.010.9932121.341.360.00020.002|0000000.010.9933121.390.880.00090.0072|0000000134121.490.120.00010.001|0000000135121.5000|0000000136121.5000|0000000137121.5000|0000000138121.5000|0000000139121.5000|0000000140121.5000|00000001

d-2x2-40snr dBMCS SelectionTPTP-SDPERPER-SD01234567891011121314151617181920212223242526272829303104.686.170.66820.4217|0.980.010.01000000000000018.257.050.46030.4239|0.90.020.080000000000000213.097.740.22470.3471|0.790.010.190.01000000000000317.447.80.13230.2281|0.5500.420.03000000000000421.597.740.0750.1295|0.330.020.570.08000000000000526.527.530.05120.0926|0.1200.660.180.010000.030000000630.197.460.05140.0941|0.0200.60.310.040000.030000000734.118.150.06340.0896|000.420.410.140000.0100.0200000840.199.190.04390.0723|000.210.450.24000000.100000945.159.470.05120.0813|000.090.320.430.0200000.14000001051.098.810.05090.0816|000.010.120.620.09000.0200.130.0100001156.379.470.04440.078|0000.050.560.2100000.160.0200001261.811.750.03830.0759|00000.520.340.010000.090.0400001368.5113.450.04540.0748|00000.340.480.030000.040.080.030001477.3114.190.05110.0787|00000.020.590.050.01000.130.080.120001585.916.380.03830.0545|00000.010.420.150.03000.10.050.240001695.0715.140.04820.0627|000000.290.170.09000.020.010.4200017103.4813.070.03540.059|000000.140.160.220000.010.460.010018111.4912.830.03340.0521|000000.030.160.3500000.390.070019118.7214.510.04060.0524|0000000.080.5600000.20.160020127.7317.730.03390.0562|0000000.040.5200000.110.330021139.621.390.0360.0525|00000000.3800000.060.520.04022149.1224.870.03420.0577|00000000.300000.020.560.12023160.929.660.05750.0814|00000000.16000000.550.270.0224179.0131.50.04590.0551|00000000.08000000.40.470.0525195.2130.090.04910.0596|00000000.02000000.240.580.1626208.6328.520.04320.0588|00000000.01000000.120.520.3527221.4922.790.0270.0411|00000000000000.060.390.5528229.6818.180.01690.0323|00000000000000.020.290.6929234.5914.660.01170.0268|00000000000000.010.180.8130238.579.310.00950.021|000000000000000.080.9231241.055.830.00360.0106|000000000000000.040.9632242.23.880.00220.0117|000000000000000.010.9933242.880.630.00050.0026|000000000000000134242.980.240.00010.001|000000000000000135243000|000000000000000136243000|000000000000000137243000|000000000000000138243000|000000000000000139243000|000000000000000140243000|0000000000000001