IEEE 802.11ac
IEEE 802.11ac
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IEEE 802.11ac is a wireless networking standard in the 802.11 family (which is marketed under the brand name Wi-Fi), developed in the IEEE Standards Association, providing high-throughput wireless local area networks (WLANs) on the 5 GHz band. The standard was developed from 2008 (PAR approved 2008-09-26) through 2013 and published in December 2013 (ANSI approved 2013-12-11).[1][2] The standard has been alternatively labelled as Wi-Fi 5 by Wi-Fi Alliance.[3][4]
The specification has multi-station throughput of at least 1 gigabit per second and single-link throughput of at least 500 megabits per second (500 Mbit/s). This is accomplished by extending the air-interface concepts embraced by 802.11n: wider RF bandwidth (up to 160 MHz), more MIMO spatial streams (up to eight), downlink multi-user MIMO (up to four clients), and high-density modulation (up to 256-QAM).[5][6]
Wi-Fi Alliance separated the introduction of ac wireless products into two phases ("wave"), named "Wave 1" and "Wave 2".[7][8] From mid-2013, the alliance started certifying Wave 1 802.11 ac products ships by manufacturers, based on the IEEE 802.11 ac Draft 3.0 (the IEEE standard was not finalized until later that year).[9] Subsequently in year 2016, Wi-Fi Alliance introduced the Wave 2 certification, which include additional features like MU-MIMO, 160MHz channel width support, support for more 5GHz channels, and four spatial streams (with four antennas; compares to three in Wave 1 and 802.11n, and eight in IEEE's 802.11ac specification).[10] It means Wave 2 products would have higher bandwidth and capacity than Wave 1 products.[11]
Contents
1 New technologies
2 Features
2.1 Mandatory
2.2 Optional
3 New scenarios and configurations
3.1 Example configurations
4 Wave 1 vs. Wave 2
5 Data rates and speed
5.1 Advertised
6 Products
6.1 Commercial routers and access points
6.2 Commercial laptops
6.3 Commercial handsets
6.4 Commercial tablets
6.5 Chipsets
7 See also
8 Notes
9 References
10 External links
New technologies[edit]
New technologies introduced with 802.11ac include the following:[6][12]
- Extended channel binding
- Optional 160 MHz and mandatory 80 MHz channel bandwidth for stations; cf. 40 MHz maximum in 802.11n.
- More MIMO spatial streams
- Support for up to eight spatial streams (vs. four in 802.11n)
- Downlink multi-user MIMO (MU-MIMO, allows up to four simultaneous downlink MU-MIMO clients)
- Multiple STAs, each with one or more antennas, transmit or receive independent data streams simultaneously.
Space-division multiple access (SDMA): streams not separated by frequency, but instead resolved spatially, analogous to 11n-style MIMO.
- Downlink MU-MIMO (one transmitting device, multiple receiving devices) included as an optional mode.
- Multiple STAs, each with one or more antennas, transmit or receive independent data streams simultaneously.
- Modulation
- 256-QAM, rate 3/4 and 5/6, added as optional modes (vs. 64-QAM, rate 5/6 maximum in 802.11n).
- Some vendors offer a non-standard 1024-QAM mode, providing 25% higher data rate compared to 256-QAM
- Other elements/features
Beamforming with standardized sounding and feedback for compatibility between vendors (non-standard in 802.11n made it hard for beamforming to work effectively between different vendor products)- MAC modifications (mostly to support above changes)
- Coexistence mechanisms for 20, 40, 80, and 160 MHz channels, 11ac and 11a/n devices
- Adds four new fields to the PPDU header identifying the frame as a very high throughput (VHT) frame as opposed to 802.11n's high throughput (HT) or earlier. The first three fields in the header are readable by legacy devices to allow coexistence
Features[edit]
Mandatory[edit]
- Borrowed from the 802.11a/802.11g specifications:
- 800 ns regular guard interval
- Binary convolutional coding (BCC)
- Single spatial stream
- 800 ns regular guard interval
- Newly introduced by the 802.11ac specification:
- 80 MHz channel bandwidths
Optional[edit]
- Borrowed from the 802.11n specification:
- Two to four spatial streams
Low-density parity-check code (LDPC)
Space–time block coding (STBC)- Transmit beamforming (TxBF)
- 400 ns short guard interval (SGI)
- Newly introduced by the 802.11ac specification:
- five to eight spatial streams
- 160 MHz channel bandwidths (contiguous 80+80)
- 80+80 MHz channel bonding (discontiguous 80+80)
- MCS 8/9 (256-QAM)
New scenarios and configurations[edit]
The single-link and multi-station enhancements supported by 802.11ac enable several new WLAN usage scenarios, such as simultaneous streaming of HD video to multiple clients throughout the home, rapid synchronization and backup of large data files, wireless display, large campus/auditorium deployments, and manufacturing floor automation.[13]
With the inclusion of USB 3.0 interface, 802.11ac access points and routers can use locally attached storage to provide various services that fully utilize their WLAN capacities, such as video streaming, FTP servers, and personal cloud services.[14] With storage locally attached through USB 2.0, filling the bandwidth made available by 802.11ac was not easily accomplished.
Example configurations[edit]
All rates assume 256-QAM, rate 5/6:
| Scenario | Typical client form factor | PHY link rate | Aggregate capacity (speed) |
|---|---|---|---|
| One-antenna AP, one-antenna STA, 80 MHz | Handheld | 433 Mbit/s | 433 Mbit/s |
| Two-antenna AP, two-antenna STA, 80 MHz | Tablet, laptop | 867 Mbit/s | 867 Mbit/s |
| One-antenna AP, one-antenna STA, 160 MHz | Handheld | 867 Mbit/s | 867 Mbit/s |
| Three-antenna AP, three-antenna STA, 80 MHz | Laptop, PC | 1.27 Gbit/s | 1.27 Gbit/s |
| Two-antenna AP, two-antenna STA, 160 MHz | Tablet, laptop | 1.69 Gbit/s | 1.69 Gbit/s |
| Four-antenna AP, four one-antenna STAs, 160 MHz (MU-MIMO) | Handheld | 867 Mbit/s to each STA | 3.39 Gbit/s |
Eight-antenna AP, 160 MHz (MU-MIMO)
| Digital TV, Set-top Box, Tablet, Laptop, PC, Handheld |
| 6.77 Gbit/s |
| Eight-antenna AP, four 2-antenna STAs, 160 MHz (MU-MIMO) | Digital TV, tablet, laptop, PC | 1.69 Gbit/s to each STA | 6.77 Gbit/s |
Wave 1 vs. Wave 2[edit]
Wave 2, referring to products introduced in 2016, offers a higher throughput than legacy Wave 1 products, those introduced starting in 2013. The PHY (physical) theoretical rate for Wave 1 maxes out at 1.3 Gbps, while Wave 2 can be 2.34 Gbps. Wave 2 can therefore reach Gigabit speeds even if the real world throughput turns out to be only 50% of the theoretical rate. Wave 2 also supports a higher number of connected devices.[11]
Data rates and speed[edit]
| MCS index[a] | Spatial Streams | Modulation type | Coding rate | Data rate (in Mbit/s)[15][b] | |||||||
|---|---|---|---|---|---|---|---|---|---|---|---|
| 20 MHz channels | 40 MHz channels | 80 MHz channels | 160 MHz channels | ||||||||
| 800 ns GI | 400 ns GI | 800 ns GI | 400 ns GI | 800 ns GI | 400 ns GI | 800 ns GI | 400 ns GI | ||||
| 0 | 1 | BPSK | 1/2 | 6.5 | 7.2 | 13.5 | 15 | 29.3 | 32.5 | 58.5 | 65 |
| 1 | 1 | QPSK | 1/2 | 13 | 14.4 | 27 | 30 | 58.5 | 65 | 117 | 130 |
| 2 | 1 | QPSK | 3/4 | 19.5 | 21.7 | 40.5 | 45 | 87.8 | 97.5 | 175.5 | 195 |
| 3 | 1 | 16-QAM | 1/2 | 26 | 28.9 | 54 | 60 | 117 | 130 | 234 | 260 |
| 4 | 1 | 16-QAM | 3/4 | 39 | 43.3 | 81 | 90 | 175.5 | 195 | 351 | 390 |
| 5 | 1 | 64-QAM | 2/3 | 52 | 57.8 | 108 | 120 | 234 | 260 | 468 | 520 |
| 6 | 1 | 64-QAM | 3/4 | 58.5 | 65 | 121.5 | 135 | 263.3 | 292.5 | 526.5 | 585 |
| 7 | 1 | 64-QAM | 5/6 | 65 | 72.2 | 135 | 150 | 292.5 | 325 | 585 | 650 |
| 8 | 1 | 256-QAM | 3/4 | 78 | 86.7 | 162 | 180 | 351 | 390 | 702 | 780 |
| 9 | 1 | 256-QAM | 5/6 | N/A | N/A | 180 | 200 | 390 | 433.3 | 780 | 866.7 |
| 0 | 2 | BPSK | 1/2 | 13 | 14.4 | 27 | 30 | 58.5 | 65 | 117 | 130 |
| 1 | 2 | QPSK | 1/2 | 26 | 28.9 | 54 | 60 | 117 | 130 | 234 | 260 |
| 2 | 2 | QPSK | 3/4 | 39 | 43.3 | 81 | 90 | 175.5 | 195 | 351 | 390 |
| 3 | 2 | 16-QAM | 1/2 | 52 | 57.8 | 108 | 120 | 234 | 260 | 468 | 520 |
| 4 | 2 | 16-QAM | 3/4 | 78 | 86.7 | 162 | 180 | 351 | 390 | 702 | 780 |
| 5 | 2 | 64-QAM | 2/3 | 104 | 115.6 | 216 | 240 | 468 | 520 | 936 | 1040 |
| 6 | 2 | 64-QAM | 3/4 | 117 | 130.3 | 243 | 270 | 526.5 | 585 | 1053 | 1170 |
| 7 | 2 | 64-QAM | 5/6 | 130 | 144.4 | 270 | 300 | 585 | 650 | 1170 | 1300 |
| 8 | 2 | 256-QAM | 3/4 | 156 | 173.3 | 324 | 360 | 702 | 780 | 1404 | 1560 |
| 9 | 2 | 256-QAM | 5/6 | N/A | N/A | 360 | 400 | 780 | 866.7 | 1560 | 1733.4 |
| 0 | 3 | BPSK | 1/2 | 19.5 | 21.7 | 40.5 | 45 | 87.8 | 97.5 | 175.5 | 195 |
| 1 | 3 | QPSK | 1/2 | 39 | 43.3 | 81 | 90 | 175.5 | 195 | 351 | 390 |
| 2 | 3 | QPSK | 3/4 | 58.5 | 65 | 121.5 | 135 | 263.3 | 292.5 | 526.5 | 585 |
| 3 | 3 | 16-QAM | 1/2 | 78 | 86.7 | 162 | 180 | 351 | 390 | 702 | 780 |
| 4 | 3 | 16-QAM | 3/4 | 117 | 130 | 243 | 270 | 526.5 | 585 | 1053 | 1170 |
| 5 | 3 | 64-QAM | 2/3 | 156 | 173.3 | 324 | 360 | 702 | 780 | 1404 | 1560 |
| 6 | 3 | 64-QAM | 3/4 | 175.5 | 195 | 364.5 | 405 | N/A | N/A | 1579.5 | 1755 |
| 7 | 3 | 64-QAM | 5/6 | 195 | 216.7 | 405 | 450 | 877.5 | 975 | 1755 | 1950 |
| 8 | 3 | 256-QAM | 3/4 | 234 | 260 | 486 | 540 | 1053 | 1170 | 2106 | 2340 |
| 9 | 3 | 256-QAM | 5/6 | 260 | 288.9 | 540 | 600 | 1170 | 1300 | 2340 | 2600 |
| 0 | 4 | BPSK | 1/2 | 26 | 28.8 | 54 | 60 | 117.2 | 130 | 234 | 260 |
| 1 | 4 | QPSK | 1/2 | 52 | 57.6 | 108 | 120 | 234 | 260 | 468 | 520 |
| 2 | 4 | QPSK | 3/4 | 78 | 86.8 | 162 | 180 | 351.2 | 390 | 702 | 780 |
| 3 | 4 | 16-QAM | 1/2 | 104 | 115.6 | 216 | 240 | 468 | 520 | 936 | 1040 |
| 4 | 4 | 16-QAM | 3/4 | 156 | 173.2 | 324 | 360 | 702 | 780 | 1404 | 1560 |
| 5 | 4 | 64-QAM | 2/3 | 208 | 231.2 | 432 | 480 | 936 | 1040 | 1872 | 2080 |
| 6 | 4 | 64-QAM | 3/4 | 234 | 260 | 486 | 540 | 1053.2 | 1170 | 2106 | 2340 |
| 7 | 4 | 64-QAM | 5/6 | 260 | 288.8 | 540 | 600 | 1170 | 1300 | 2340 | 2600 |
| 8 | 4 | 256-QAM | 3/4 | 312 | 346.8 | 648 | 720 | 1404 | 1560 | 2808 | 3120 |
| 9 | 4 | 256-QAM | 5/6 | N/A | N/A | 720 | 800 | 1560 | 1733.2 | 3120 | 3466.8 |
Several companies are currently offering 802.11ac chipsets with higher modulation rates: MCS-10 and MCS-11 (1024-QAM), supported by Quantenna and Broadcom. Although technically not part of 802.11ac, these new MCS indices are expected to become official in the 802.11ax standard (~2019), the successor to 802.11ac.
160 MHz channels, and thus the throughput might be unusable in some countries/regions due to regulatory issues that allocated some frequencies for other purposes.
Advertised[edit]
| Type | 2.4 GHz band[c] (Mbit/s) | config [all 40 MHz] | 5 GHz band (Mbit/s) | config [all 80 MHz] |
|---|---|---|---|---|
| AC450[16] | - | - | 433 | 1 stream @ MCS 9 |
| AC600 | 150 | 1 stream @ MCS 7 | 433 | 1 stream @ MCS 9 |
| AC750 | 300 | 2 streams @ MCS 7 | 433 | 1 stream @ MCS 9 |
| AC1000 | 300 | 2 streams @ MCS 7 | 650 | 2 streams @ MCS 7 |
| AC1200 | 300 | 2 streams @ MCS 7 | 867 | 2 streams @ MCS 9 |
| AC1300 | 400 | 2 streams @ MCS 9 | 867 | 2 streams @ MCS 9 |
| AC1300[17] | - | - | 1,300 | 3 streams @ MCS 9 |
| AC 1350[18] | 450 | 3 streams @ MCS 7 | 867 | 2 streams @ MCS 9 |
| AC1450 | 450 | 3 streams @ MCS 7 | 975 | 3 streams @ MCS 7 |
| AC1600 | 300 | 2 streams @ MCS 7 | 1,300 | 3 streams @ MCS 9 |
| AC1750 | 450 | 3 streams @ MCS 7 | 1,300 | 3 streams @ MCS 9 |
| AC1900 | 600[d] | 3 streams @ MCS 9 | 1,300 | 3 streams @ MCS 9 |
| AC2200 | 450 | 3 streams @ MCS 7 | 1,733 | 4 streams @ MCS 9 |
| AC2300 | 600 | 4 streams @ MCS 7 | 1,625 | 5 streams @ MCS 7 |
| AC2350 | 600 | 4 streams @ MCS 7 | 1,733 | 4 streams @ MCS 9 |
| AC2600 | 800[d] | 4 streams @ MCS 9 | 1,733 | 4 streams @ MCS 9 |
| AC3000 | 450 | 3 streams @ MCS 7 | 1,300 + 1,300 | 3 streams @ MCS 9 x 2 |
| AC3150 | 1000[e] | 4 streams @ 1024-QAM | 2,167 | 4 streams @ 1024-QAM |
| AC3200 | 600[d] | 3 streams @ MCS 9 | 1,300 + 1,300[f] | 3 streams @ MCS 9 x 2 |
| AC5000 | 600 | 4 streams @ MCS 7 | 2,167 + 2,167 | 4 streams @ 1024-QAM x 2 |
| AC5300[21] | 1000[e] | 4 streams @ 1024-QAM | 2,167 + 2,167 | 4 streams @ 1024-QAM x 2 |
Products[edit]
Commercial routers and access points[edit]
Quantenna released the first 802.11ac chipset for retail Wi-Fi routers and consumer electronics on November 15, 2011.[22] Redpine Signals released the first low power 802.11ac technology for smartphone application processors on December 14, 2011.[23] On January 5, 2012, Broadcom announced its first 802.11ac Wi-Fi chips and partners[24] and on April 27, 2012, Netgear announced the first Broadcom-enabled router.[25] On May 14, 2012, Buffalo Technology released the world’s first 802.11ac products to market, releasing a wireless router and client bridge adapter.[26] On December 6, 2012, Huawei announced commercial availability of the industry's first enterprise-level 802.11ac Access Point.[27]
Motorola Solutions is selling 802.11ac access points including the AP 8232.[28] In April 2014, Hewlett-Packard started selling the HP 560 access point in the controller-based WLAN enterprise market segment.[29]
Commercial laptops[edit]
On June 7, 2012, it was reported that Asus had unveiled its ROG G75VX gaming notebook, which would be the first consumer-oriented notebook to be fully compliant with 802.11ac[30] (albeit in its "draft 2.0" version).
In June 2013, Apple announced that the new MacBook Air features 802.11ac wireless networking capabilities,[31][32] later announcing in October 2013 that the MacBook Pro and Mac Pro also featured 802.11ac.[33][34]
As of December 2013[update], Hewlett-Packard incorporates 802.11ac compliance in laptop computers.[35]
Commercial handsets[edit]
| Vendor | Model | Release Date | Chipset | Notes |
|---|---|---|---|---|
| HTC | One (M7) | March 22, 2013 | BCM4335 [36] | First 802.11ac-enabled handset announced February 19, 2013[37] |
| Samsung | Galaxy S4 | April 26, 2013 | BCM4335 [38] | |
| Samsung | Galaxy Note 3 | September 25, 2013 | BCM4339 [39] | Subsequent Devices Include 802.11ac |
| LG | LG Nexus 5 | October 2013[40] | BCM4339 [41] | BCM4339 is the updated version of the BCM4335 |
| Nokia | Lumia 1520 | November 2013[42] | WCN3680 | First 802.11ac-enabled Windows Phone |
| Nokia | Lumia Icon | February 20, 2014[43] | WCN3680 | Lumia 930 is Europe version of the same phone, also with 802.11ac |
| HTC | One (M8) | March 25, 2014 | WCN3680 [44] | |
| Samsung | Galaxy S5 | April 11, 2014 | BCM4354[45] | |
| LG | G2 | September 18, 2013 | AWL9581 [46] | |
| LG | G3 | May 23, 2014 | BCM4339 [47] | |
| Amazon.com | Fire Phone | July 25, 2014 [48] | WCN3680 [49] | |
| Samsung | Galaxy S5 Prime/SM-G906S | June 18, 2014 | QCA6174 | |
| Samsung | Galaxy Alpha | September 7, 2014 | E702A7[50] | |
| Apple | iPhone 6/Plus | September 19, 2014 | BCM4345[51] | First 802.11ac-enabled iOS devices |
| Motorola | Nexus 6 | October 16, 2014 | BCM4356[52] | |
| Samsung | Galaxy Note 4 | October 10, 2014 | BCM4358[53] | |
| Samsung | Galaxy Note 5 | August 21, 2015 | BCM4359 [54] |
Commercial tablets[edit]
| Vendor | Model | Release Date | Chipset | Notes |
|---|---|---|---|---|
| Microsoft | Surface Pro 3 | June 20, 2014 | Avastar 88W8897 | 802.11ac-enabled touchscreen computing device |
| Apple | iPad Air 2 | October 24, 2014 | Broadcom BCM4350 | First 802.11ac-enabled iOS tablet device |
| Nexus 9 | November 3, 2014 | Nvidia Tegra K1 | 2x2 MIMO |
Chipsets[edit]
| Vendor | Part # | Streams | LDPC | TxBF | 256-QAM | Applications |
|---|---|---|---|---|---|---|
| Broadcom | BCM43602 | 3 |  | | | routers, laptops |
| Broadcom | BCM4360 | 3 | | | | routers, laptops |
| Broadcom | BCM43569 | 2 | | | | DTV |
| Broadcom | BCM4352 | 2 | | | | tablets |
| Broadcom | BCM4350 | 2 | | | | tablets |
| Broadcom | BCM4356 | 2 | | | | handsets, tablets |
| Broadcom | BCM4354 | 2 | | | | handsets, tablets |
| Broadcom | BCM4339 | 1 | | | | handsets |
| Broadcom | BCM4335 | 1 | | | | handsets |
| Broadcom | BCM4359 | 2 | | | | handsets |
| Broadcom | BCM43455 | 1 | | | | handsets |
| Marvell | Avastar 88W8897 | 2 | | | | tablets |
| Marvell | Avastar 88W8864 | 3 | | | | routers |
| Qualcomm | WCN3680 | 1 | | | | handsets |
| Qualcomm | 2 | |  | | tablets | |
| Qualcomm | QCA9880 | 3 | | | | home routers |
| Qualcomm | 3 | | | | enterprise routers | |
| Qualcomm | QCA9892 | 2 | | | | tablets, PtP Links |
| Qualcomm | 4 | | | | enterprise access points | |
| Qualcomm | QCA9992 | 3 | | | | enterprise access points |
| MediaTek | MT7610 | 1 | ? | ? | ? | PC (PCIe or USB) |
| MediaTek | [ MT7650] | 1 | ? | | | handsets |
| MediaTek | MT7612E | 2 | | | | laptops (PCIe 2.0) |
| MediaTek | 2 | | | | laptops (USB 3.0) | |
| Quantenna | QAC2300 | 4 | | | | routers |
| Redpine Signals | RS9117 | 1 | | ? | | handsets |
| Redpine Signals | RS9333 | 3 | | ? | | routers |
| Realtek | RTL8811AU | 1 | ? | ? | ? | adapter (USB 2.0) |
| Realtek | RTL8812AU | 2 | ? | ? | ? | adapter (USB 3.0) |
| Intel | AC-3160 | 1 | ? | ? | ? | laptops |
| Intel | AC-7260 | 2 | ? | ? | ? | laptops |
See also[edit]
- IEEE 802.11ax
- IEEE 802.11ad
- IEEE 802.11
Notes[edit]
^ MCS 9 is not applicable to all channel width/spatial stream combinations.
^ A second stream doubles the theoretical data rate, a third one triples it, etc.
^ 802.11ac only specifies operation in the 5 GHz band. Operation in the 2.4 GHz band is specified by 802.11n.
^ abc With 802.11n, 600 Mbit/s in the 2.4 GHz band can be achieved by using four spatial streams at 150 Mbit/s each. As of December 2014[update], commercially available devices that achieve 600 Mbit/s in the 2.4 GHz band use 3 spatial streams at 200 Mbit/s each.[19][20] This requires the use of 256-QAM modulation, which is not compliant with 802.11n and can be considered a proprietary extension.[20]
^ ab With proprietary extension to 802.11n, using 40MHz channel in 2.4GHz, 400ns guard interval, 1024-QAM, and 4 spatial streams.
^ As of December 2014[update], commercially available AC3200 devices use two separate radios with 1,300 Mbit/s each to achieve 2,600 Mbit/s total in the 5 GHz band.
References[edit]
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External links[edit]
- 802.11ac Technology Introduction white paper
- A list of 802.11ac devices
- Understanding IEEE 802.11ac Wi-Fi Standard and Preparing the Enterprise WLAN
- MIMO 802.11ac Test Architectures
- 802.11ac: The Fifth Generation of Wi-Fi Technical Paper
- Intel® Wireless Products Selection Guide
Categories:
- IEEE 802.11
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