1. Submission September 2004 doc.: IEEE 802.11-04/0935r3 S. Coffey, et al., WWiSE group Slide 1 WWiSE IEEE 802.11n Proposal September 16, 2004 Airgo Networks, Bermai, Broadcom, Conexant, Realtek, STMicroelectronics, Texas Instruments

2. Submission September 2004 doc.: IEEE 802.11-04/0935r3 S. Coffey, et al., WWiSE group Slide 2 Contributors and contact information Airgo Networks: VK Jones, vkjones@airgonetworks.com Bermai: Neil Hamady, nhamady@bermai.com Broadcom: Jason Trachewsky, jat@broadcom.com Conexant: Michael Seals, michael.seals@conexant.com Realtek: Stephan ten Brink, stenbrink@realtek-us.com STMicroelectronics: George Vlantis, George.Vlantis@st.com Texas Instruments: Sean Coffey, coffey@ti.com

3. Submission September 2004 doc.: IEEE 802.11-04/0935r3 S. Coffey, et al., WWiSE group Slide 3 Contents WWiSE approach Overview of key features Proposal description –Physical layer design –MAC features Discussion Summary

4. Submission September 2004 doc.: IEEE 802.11-04/0935r3 S. Coffey, et al., WWiSE group Slide 4 The WWiSE approach WWiSE = World Wide Spectrum Efficiency The partnership was formed to develop a specification for next generation WLAN technology suitable for worldwide deployment Mandatory modes of the WWiSE proposal comply with current requirements in all major regulatory domains: Europe, Asia, Americas Proposal design emphasizes compatibility with existing installed base, building on experience with interoperability in 802.11g and previous 802.11 amendments All modes are compatible with QoS and 802.11e Maximal spectral efficiency translates to highest performance and throughput in all modes

5. Submission September 2004 doc.: IEEE 802.11-04/0935r3 S. Coffey, et al., WWiSE group Slide 5 The WWiSE approach, contd. One solution applicable to all markets “Synergy and mutual reinforcement is only possible if the following conditions are met: The same HT technology is able to function in all three markets and environments [home, enterprise, hotspot]– this enhances the utility of HT for the users … ” –Wi-Fi Alliance MRD for High Throughput Technology, Nov. 2003 (doc. 11-03/879r2)

6. Submission September 2004 doc.: IEEE 802.11-04/0935r3 S. Coffey, et al., WWiSE group Slide 6 Overview of key mandatory features The WWiSE proposal’s mandatory modes are: –2 transmit antennas –20 MHz operation –135 Mbps maximum PHY rate –2x1 transmit diversity modes, 20 MHz –Mixed mode preambles enabling on-the-air legacy compatibility –Efficient greenfield preambles – no increase in length over legacy –Enhanced efficiency MAC mechanisms –All components based on enhancement of existing COFDM PHY 2x2 MIMO operation in a 20 MHz channel: Goal is a robust, efficient, small-form-factor, universally compliant 100 Mbps mode that fits naturally with the existing installed base

7. Submission September 2004 doc.: IEEE 802.11-04/0935r3 S. Coffey, et al., WWiSE group Slide 7 Overview of key optional features The WWiSE proposal’s optional modes are: –3 and 4 transmit antennas –40 MHz operation –Up to 540 Mbps PHY rate –2x1, 3x2, 4x2, 4x3 transmit diversity modes –Advanced coding: Rate-compatible LDPC code

8. Submission September 2004 doc.: IEEE 802.11-04/0935r3 S. Coffey, et al., WWiSE group Slide 8 Transmitter block diagram FEC encoder, puncturer MIMO interleaver Symbol mapper D/A Interpol., filtering, limiter Upconverter, amplifier IFFT Add cyclic extension (guard) Add pilots Insert training

9. Submission September 2004 doc.: IEEE 802.11-04/0935r3 S. Coffey, et al., WWiSE group Slide 9 Unified format Code rate Cyclic prefix, ns CodeConstellation 1/2800BCC, LDPC16-QAM 3/4800BCC, LDPC16-QAM 2/3800BCC, LDPC64-QAM 3/4800BCC, LDPC64-QAM 5/6800BCC, LDPC64-QAM All combinations of 2, 3, 4 transmit antennas and 20/40 MHz offer exactly these 5 modes All 20 MHz modes have 54 data subcarriers, 2 pilots. All 40 MHz modes have 108 data subcarriers, 4 pilots

10. Submission September 2004 doc.: IEEE 802.11-04/0935r3 S. Coffey, et al., WWiSE group Slide 10 Advantages of unified format Minimization of cost: –Development time, testing of modes, and interoperability are significant sources of cost –A unified basic plan simplifies these tasks Market acceptance and growth –Faster time to market –The most straightforward scalability Rate selection and management: –One basic plan across all antenna configurations and bandwidths

11. Submission September 2004 doc.: IEEE 802.11-04/0935r3 S. Coffey, et al., WWiSE group Slide 11 2 transmitter SDM, 20 MHz (mandatory) PHY rateData carriers PilotsCode rate Cyclic prefix, ns CodeConstellation 54 Mbps5421/2800BCC16-QAM 81 Mbps5423/4800BCC16-QAM 108 Mbps5422/3800BCC64-QAM 121.5 Mbps5423/4800BCC64-QAM 135 Mbps5425/6800BCC64-QAM

12. Submission September 2004 doc.: IEEE 802.11-04/0935r3 S. Coffey, et al., WWiSE group Slide 12 2x1 modes, 20 MHz (mandatory) PHY rateData carriers PilotsCode rate Cyclic prefix, ns CodeConstellation 6.75 Mbps5421/2800BCCBPSK 10.125 Mbps5423/4800BCCBPSK 13.5 Mbps5421/2800BCCQPSK 20.25 Mbps5423/4800BCCQPSK 27 Mbps5421/2800BCC16-QAM 40.5 Mbps5423/4800BCC16-QAM 54 Mbps5422/3800BCC64-QAM 60.75 Mbps5423/4800BCC64-QAM

13. Submission September 2004 doc.: IEEE 802.11-04/0935r3 S. Coffey, et al., WWiSE group Slide 13 Optional data modes 20 MHz: –3 Tx space-division multiplexing –4 Tx space division multiplexing –3x2, 4x2, 4x3 space-time transmit diversity 40 MHz: (all 40 MHz modes optional) –1 Tx antenna –2 Tx space division multiplexing –3 Tx space division multiplexing –4 Tx space division multiplexing –2x1, 3x2, 4x2, 4x3 space-time transmit diversity LDPC code option –An option in all proposed MIMO configurations and channel bandwidths

14. Submission September 2004 doc.: IEEE 802.11-04/0935r3 S. Coffey, et al., WWiSE group Slide 14 Optional mode data rates ConfigurationRate ½, 16-QAM Rate ¾, 16-QAM Rate 2/3, 64-QAM Rate ¾, 64-QAM Rate 5/6, 64-QAM 3 Tx, 20 MHz 81121.5162182.25202.5 4 Tx, 20 MHz 108162216243270 ConfigurationRate ½, 16-QAM Rate ¾, 16-QAM Rate 2/3, 64-QAM Rate ¾, 64-QAM Rate 5/6, 64-QAM 1 Tx, 40 MHz 5481108121.5135 2 Tx, 40 MHz 108162216243270 3 Tx, 40 MHz 162243324364.5405 4 Tx, 40 MHz 216364432486540 40 MHz: 20 MHz:

15. Submission September 2004 doc.: IEEE 802.11-04/0935r3 S. Coffey, et al., WWiSE group Slide 15 FEC encoder, puncturer MIMO interleaver Symbol mapper D/A Interpol., filtering, limiter Upconverter, amplifier IFFT Add cyclic extension (guard) Add pilots Insert training

16. Submission September 2004 doc.: IEEE 802.11-04/0935r3 S. Coffey, et al., WWiSE group Slide 16 Preambles Mixed-mode preambles: –Capable of operation in presence of legacy 11a/g devices –Ensure correct deferral behavior by devices compliant to legacy spec Green-field preambles: –Operate in time interval or environment with only 11n devices on the air –May be used with protection mechanisms, as in 11g; or with new burst mode; or in 11n-only BSS –Greater efficiency than mixed-mode preambles Both preamble types are derived from a common basic structure, providing reuse in algorithms

17. Submission September 2004 doc.: IEEE 802.11-04/0935r3 S. Coffey, et al., WWiSE group Slide 17 Short training sequence STRN 400 ns cs STRN 400 ns cs STRN 200 ns cs STRN 400 ns cs STRN 200 ns cs STRN 600 ns cs 2 Transmitters 3 Transmitters 4 Transmitters 20 MHz: STRN = 802.11ag short training sequence 40 MHz mixed mode: STRN = Pair of 802.11ag short sequences separated in frequency by 20 MHz 40 MHz green field: STRN = Newly defined sequence cs = Cyclic shift

18. Submission September 2004 doc.: IEEE 802.11-04/0935r3 S. Coffey, et al., WWiSE group Slide 18 Long training sequence and SIGNAL-N, green-field, 2 transmitters 20 MHz: LTRN = 802.11ag long training sequence with four extra tones, 6.4 usec 40 MHz: LTRN = Newly defined sequence, 6.4 usec GI2 1 = GI2 for LTRN with 1600 ns cyclic shift SIGNAL-N = 54 bits, 4 usec GI2 1 STRN 400 ns cs LTRN 1600 ns cs GI2 SIGNAL-N 1600 ns cs

19. Submission September 2004 doc.: IEEE 802.11-04/0935r3 S. Coffey, et al., WWiSE group Slide 19 Long training sequence and SIGNAL-N, green-field, 3 and 4 transmitters STRN 400 ns cs STRN 200 ns cs STRN 600 ns cs GI2 1 LTRN 1600 ns cs GI2 GI2 3 LTRN 100 ns cs LTRN 1700 ns cs GI2 2 GI2 1 LTRN 1600 ns cs GI2  GI2 3  LTRN 100 ns cs  LTRN 1700 ns cs  GI2 2 SIGNAL-N 100 ns cs SIGNAL-N 1600 ns cs SIGNAL-N 1700 ns cs For 3 transmitters, the first three rows are used

20. Submission September 2004 doc.: IEEE 802.11-04/0935r3 S. Coffey, et al., WWiSE group Slide 20 Long training and SIGNAL fields, mixed mode, 2 transmitters GI2 4 STRN 400 ns cs LTRN  100 ns cs GI2 SIGNAL  100 ns cs 2 transmitter green-field long training and SIGNAL-N; plus short sequence if 40 MHz

21. Submission September 2004 doc.: IEEE 802.11-04/0935r3 S. Coffey, et al., WWiSE group Slide 21 Long training and SIGNAL fields, mixed mode, 3 and 4 transmitters STRN LTRN STRN 400 ns cs GI2 4 LTRN  100 ns cs GI2 SIGNAL  100 ns cs 3 or 4 transmitter green-field long training and SIGNAL-N; plus short training if 40 MHz STRN 600 ns cs SIGNAL 200 ns cs GI2 6 LTRN 200 ns cs STRN 200 ns cs LTRN 100 ns cs GI2 5 SIGNAL 100 ns cs For 3 transmitters, the first three rows are used

22. Submission September 2004 doc.: IEEE 802.11-04/0935r3 S. Coffey, et al., WWiSE group Slide 22 Preamble lengths (20 & 40 MHz) All space-time block codes follow the pattern with the same number of transmit antennas 8 8 0 0 Second long 284884x4 284883x3 204882x2 204881x1 TotalSIGNALFirst long ShortConfigurationGreen-field

23. Submission September 2004 doc.: IEEE 802.11-04/0935r3 S. Coffey, et al., WWiSE group Slide 23 Preamble lengths (20 & 40 MHz), contd. All space-time block codes follow the pattern with the same number of transmit antennas Mixed mode 0/8  /8 Second short 8 8 0 0 Third long 4 4 4 4 Second SIGNAL 8 8 8 8 Second long 40/484884x4 40/484883x3 32/404882x2  /40 4881x1 TotalSIGNALFirst long ShortConfiguration

24. Submission September 2004 doc.: IEEE 802.11-04/0935r3 S. Coffey, et al., WWiSE group Slide 24 FEC encoder, puncturer MIMO interleaver Symbol mapper D/A Interpol., filtering, limiter Upconverter, amplifier IFFT Add cyclic extension (guard) Add pilots Insert training

25. Submission September 2004 doc.: IEEE 802.11-04/0935r3 S. Coffey, et al., WWiSE group Slide 25 Parallel encoders For 40 MHz modes with more than two spatial streams, two parallel BCC encoders are used: Multiplexing across two encoders (round robin) BCC encoder, puncturer To MIMO interleaver Data payload

26. Submission September 2004 doc.: IEEE 802.11-04/0935r3 S. Coffey, et al., WWiSE group Slide 26 Advanced coding option Rate-compatible LDPC code with the following parameters: Transmitter block diagram as for BCC modes, except symbol interleaver, rate-compatible puncturing, and tail bits are not used 194416205/6 194414583/4 194412962/3 19449721/2 Block lengthInformation bitsRate

27. Submission September 2004 doc.: IEEE 802.11-04/0935r3 S. Coffey, et al., WWiSE group Slide 27 LDPC code, contd. There is no change required to SIFS or to any other system timing parameters when the advanced coding option is used The block size of 1944 reduces or eliminates the need for pad bits at the end of a packet –Pad bits are eliminated for 2 transmitter operation in 20 MHz channels, and 2x1 and 1x1 in 40 MHz channels The four parity check matrices are derived from the rate-1/2 matrix via row combining The parity check matrices are structured and based on square- shaped building blocks of size 27x27 The parity check matrices are structured to enable efficient encoding

28. Submission September 2004 doc.: IEEE 802.11-04/0935r3 S. Coffey, et al., WWiSE group Slide 28 FEC encoder, puncturer MIMO interleaver Symbol mapper D/A Interpol., filtering, limiter Upconverter, amplifier IFFT Add cyclic extension (guard) Add pilots Insert training

29. Submission September 2004 doc.: IEEE 802.11-04/0935r3 S. Coffey, et al., WWiSE group Slide 29 MIMO interleaving Coded bits TX 0 interleaved bits TX 1 interleaved bits ConfigurationIdepth 108 tones, 1 Tx, 2x112 All others6 Bit-cycling across N TX transmitters Parameterized 802.11a-style interleaver 5 subcarrier shift, same interleaver... Shift of 5 additional subcarriers for each additional antenna

30. Submission September 2004 doc.: IEEE 802.11-04/0935r3 S. Coffey, et al., WWiSE group Slide 30 FEC encoder, puncturer MIMO interleaver Symbol mapper D/A Interpol., filtering, limiter Upconverter, amplifier IFFT Add cyclic extension (guard) Add pilots Insert training

31. Submission September 2004 doc.: IEEE 802.11-04/0935r3 S. Coffey, et al., WWiSE group Slide 31 Space-time block codes and asymmetry Simple space-time block codes (STBCs) are used to handle asymmetric antenna configurations –STBC rate always is an integer  No new PHY rates result from STBC encoding of streams –Block size is always two OFDM symbols –STBC encoding follows the stream encoding AP STA

32. Submission September 2004 doc.: IEEE 802.11-04/0935r3 S. Coffey, et al., WWiSE group Slide 32 Asymmetric modes, contd. These modes are all open-loop –No channel state information required at transmitter –No calibration required –No overhead from exchanging channel state information –No sensitivity to channel state information errors

33. Submission September 2004 doc.: IEEE 802.11-04/0935r3 S. Coffey, et al., WWiSE group Slide 33 Space-time block codes 2x1: 3x2: 4x2: 4x3: s1*s1* s2*s2* Tx 2 s2s2 s1s1 Tx 1 t2t2 t1t1 s1*s1* s2*s2* Tx 2 s4s4 s3s3 Tx 3 s2s2 s1s1 Tx 1 t2t2 t1t1 s1*s1* s2*s2* Tx 2 s4s4 s3s3 Tx 3 s3*s3* s4*s4* Tx 4 s2s2 s1s1 Tx 1 t2t2 t1t1 s1*s1* s2*s2* Tx 2 s4s4 s3s3 Tx 3 ss ss Tx 4 s2s2 s1s1 Tx 1 t2t2 t1t1 The STBC is applied independently to each OFDM subcarrier

34. Submission September 2004 doc.: IEEE 802.11-04/0935r3 S. Coffey, et al., WWiSE group Slide 34 FEC encoder, puncturer MIMO interleaver Symbol mapper D/A Interpol., filtering, limiter Upconverter, amplifier IFFT Add cyclic extension (guard) Add pilots Insert training

35. Submission September 2004 doc.: IEEE 802.11-04/0935r3 S. Coffey, et al., WWiSE group Slide 35 Power spectral density, 20 MHz An AWG is loaded with files representing signal formats of interest. –Each file represents about 0.5 msec of randomly modulated OFDM symbols, prepended with short and long training sequences Output of AWG is modulated using an R&S SMIQ to IF frequency The output of the SMIQ is input to a board with RFFE+PA –The PA distorts the input spectrum, producing spectral regrowth. The resulting spectrum is recorded on a spectrum analyzer. IF R&S SMIQ Spectrum Analyzer AWG I Q I Q RFFE Board RF (2.4 GHz) R&S SMIQ LO

36. Submission September 2004 doc.: IEEE 802.11-04/0935r3 S. Coffey, et al., WWiSE group Slide 36 56-tone OFDM signals This is a 56 tone OFDM signal with a short trapezoidal window The PA is operated 3.5 dB backed off from PO-1 dB compression point The signal meets spectral mask The “standard” 52 tone OFDM signal with same window meets mask with a backoff of 3.0 dB -

37. Submission September 2004 doc.: IEEE 802.11-04/0935r3 S. Coffey, et al., WWiSE group Slide 37 2 pilot symbols MIMO systems have multiple receive chains, providing receive diversity Format uses cyclic modulation of pilot symbols in time and space, for 20 MHz and 40 MHz –This provides transmit diversity gain over a static modulation Overall the scheme provides robust synchronization with MIMO-OFDM transmission

38. Submission September 2004 doc.: IEEE 802.11-04/0935r3 S. Coffey, et al., WWiSE group Slide 38 MAC features

39. Submission September 2004 doc.: IEEE 802.11-04/0935r3 S. Coffey, et al., WWiSE group Slide 39 MAC features The WWiSE proposal builds on 802.11e functionality as much as possible, in particular EDCA, HCCA, and Block Ack –Block Ack mandatory Backward compatibility Simplicity –Shorter time to standardization –Shorter time to productization Effectiveness –Eliminate the big bottlenecks

40. Submission September 2004 doc.: IEEE 802.11-04/0935r3 S. Coffey, et al., WWiSE group Slide 40 Aggregation Bursting and Aggregation: –MSDU aggregation Increased maximum PSDU length, to 8191 octets –PSDU aggregation = HTP burst: sequence of MPDUs from same transmitter Reduced interframe spacing –0 usec if at same Tx power level and PHY configuration –2 usec otherwise (with preamble) –Not dependent on RA

41. Submission September 2004 doc.: IEEE 802.11-04/0935r3 S. Coffey, et al., WWiSE group Slide 41 HTP Burst = PPDU aggregation Multiple RA allowed within the burst Block Ack Request and Block Ack frames allowed within the burst Last PSDU bit indicates to receiver that it should revert to preamble search PSDUNsPSDUNsPSDUNsxIFS No idle gap Last PSDU bit set Normal ACK policy Non-normal ACK Ns = N-Signal field @ robust encoding rate Np = N-Preamble Np

42. Submission September 2004 doc.: IEEE 802.11-04/0935r3 S. Coffey, et al., WWiSE group Slide 42 HTP Burst vs. MSDU Aggregation HTP burst allows aggregation without incurring latency cost (on-the-fly aggregation) HTP allows multiple RA per burst HTP allows multiple rates within burst HTP allows varying TX power within burst

43. Submission September 2004 doc.: IEEE 802.11-04/0935r3 S. Coffey, et al., WWiSE group Slide 43 Block Ack  Ack Policy Block Ack frames now have ACK policy bits –Allows: Normal ACK behavior per 802.11e draft No-ACK other settings reserved –Reduces Block Ack overhead by eliminating explicit ACKs (as an option)

44. Submission September 2004 doc.: IEEE 802.11-04/0935r3 S. Coffey, et al., WWiSE group Slide 44 Block Ack  Ack Policy, contd. –Allows multiple RA + Block Ack Frames within a single HTP burst if immediate ACK required: –HTP burst broken to allow SIFS + ACK –HTP burst single RA, ending with Block Ack Request + SIFS + ACK –HTP burst single RA, ending with Block Ack Request + Block Ack + ACK without immediate ACK –HTP burst is allowed to continue –HTP burst may contain multiple Block Ack Request to multiple RA –Effectively allows additional, more efficient modes of use for Block Ack mechanism

45. Submission September 2004 doc.: IEEE 802.11-04/0935r3 S. Coffey, et al., WWiSE group Slide 45 Legacy Interaction Legacy remediation –N-STA detection/advertisement Identification of TGn and non-TGn devices and BSSs Extends ERP information element Uses proven 802.11g signaling –Legacy Protection mechanisms Existing protection mechanisms (extended to N/G case) Addition of PLCP length spoofing –40/20 MHz channel switching supported Equitable sharing of resources with legacy

46. Submission September 2004 doc.: IEEE 802.11-04/0935r3 S. Coffey, et al., WWiSE group Slide 46 Simulations PHY model in MAC simulations –Detailed description in IEEE 802.11-04/877r3 –TGn MIMO Channel Models –Impairments as specified by FRCC –Union bound technique to estimate PHY layer frame errors –Performance closely matches full simulations for mandatory phy configurations Binary convolutional coding –Executes as MATLAB routine called by MAC simulator in NS

47. Submission September 2004 doc.: IEEE 802.11-04/0935r3 S. Coffey, et al., WWiSE group Slide 47 EDCA Simulation Results EDCA 2x2 – 20MHz 5GHz (max rate = 135 mbps) –QOS goals met, all flows, all scenarios S-1: 54 Mbps (52q/1.5nq), latencies excellent S-4: 44 Mbps (10q/34nq), latencies excellent S-6: 47 Mbps (45q/2nq), latencies very good EDCA 2x2 – 40MHz 5GHz (max rate = 270 mbps) –Even better, e.g. S-1: 56 Mbps (52q/3.5nq), latencies excellent S-4: 65 Mbps (10q/55nq), latencies excellent S-6: 51 Mbps (45q/6nq), latencies excellent * HTP burst employed in sims, but no aggregation used

48. Submission September 2004 doc.: IEEE 802.11-04/0935r3 S. Coffey, et al., WWiSE group Slide 48 EDCA Simulation Parameters – AP/STA e.g., scenario 4 CWMINCWMAXAIFSN TXOP LIMIT msec AC_BK31/63511/5114/42.0/1.0 AC_BE31/63127/2554/43.0/2.5 AC_VI15/1531/313/32.5/1.1 AC_VO7/1531/312/21.2/1.0

49. Submission September 2004 doc.: IEEE 802.11-04/0935r3 S. Coffey, et al., WWiSE group Slide 49 HCCA Simulation Results HCCA 2x2 – 20MHz 5GHz (max rate = 135 mbps) –QOS goals met, all flows, all scenarios S-1: 80 Mbps (52q/28nq), latencies excellent S-4: 86 Mbps (10q/76nq), latencies very good* S-6: 63 Mbps (45q/18nq), latencies excellent HCCA 2x2 – 40MHz 5GHz (max rate = 270 mbps) –Even better, e.g. S-1: 110 Mbps (52q/58nq), latencies excellent S-4: 135 Mbps (10q/125nq), latencies excellent S-6: 70 Mbps (46q/24nq), latencies excellent * scheduler tuned too much toward BE flows

50. Submission September 2004 doc.: IEEE 802.11-04/0935r3 S. Coffey, et al., WWiSE group Slide 50 HCCA Simulation Parameters HTP burst employed, but no MSDU aggregation used Very simple scheduler employed –Round robin Same TXOP value granted to all STA, regardless of flow characteristics, number of flows at STA, or priority of flows Each STA polled once per round No real effort put into making an intelligent scheduler Results quite good –Could be better Better scheduler could be used Could employ MSDU aggregation

51. Submission September 2004 doc.: IEEE 802.11-04/0935r3 S. Coffey, et al., WWiSE group Slide 51 Discussion

52. Submission September 2004 doc.: IEEE 802.11-04/0935r3 S. Coffey, et al., WWiSE group Slide 52 100 Mbps throughput See response to CC 27 in 11/04-0877-00-000n Efficiency upgrades in 802.11e and further enhancements in 11n mean that the 45-50% system efficiencies of old 802.11 systems have evolved to 75-85% in contemporary systems –Many such enhancements are commercially available in firmware upgrades from multiple vendors 100 Mbps throughput is achieved from 135 Mbps PHY rate in a variety of scenarios 100 Mbps throughput may even be achieved from 121.5 Mbps PHY rate

53. Submission September 2004 doc.: IEEE 802.11-04/0935r3 S. Coffey, et al., WWiSE group Slide 53 100 Mbps throughput, contd. Example scenario: –4000 byte packets –HTP burst transmission, 3 packets –Block ack –10%+ for assorted other users, beacons, etc. BSS share, etc. Preamble SIGNAL-N SIFSDIFS 960 usec Data payload Block ack request/ack 20240 4 4 24 1632 34 106

54. Submission September 2004 doc.: IEEE 802.11-04/0935r3 S. Coffey, et al., WWiSE group Slide 54 Modes and robustness Ways of achieving 100 Mbps throughput robustly: 2x2, 20 MHz channel, 121.5 Mbps mode, BCC, MMSE detection. –Requires high MAC efficiency; achievable with both HCCA and EDCA 2x2, 20 MHz channel, 135 Mbps mode, LDPC, MMSE detection 2x3, 20 MHz channel, 135 Mbps mode, BCC, MMSE detection. –Requires third radio receive chain; meets feasibility threshold easily 2x2, 20 MHz channel, 135 Mbps mode, near-ML detection –Requires reduced-complexity algorithms for detection

55. Submission September 2004 doc.: IEEE 802.11-04/0935r3 S. Coffey, et al., WWiSE group Slide 55 Optionality of 40 MHz Reasons why 40 MHz channels are not proposed as mandatory: Limited worldwide applicability –Europe: clause 4.4.2.2 of ETSI EN 301 893 V1.2.3 –Japan: ARIB STD-T71 Not necessarily better in performance than two 20 MHz channels –Repackaging; System and contention overhead; Dense deployments However there are cases where 40 MHz channels make sense –We offer full range of 40 MHz modes – all as optional

56. Submission September 2004 doc.: IEEE 802.11-04/0935r3 S. Coffey, et al., WWiSE group Slide 56 Summary One unified format for modes Used for 2, 3, 4, transmit antennas 20 MHz and 40 MHz channels Used with open-loop space-time block codes BCC, LDPC Code 64-QAM8003/4 16-QAM8003/4 64-QAM8005/6 16-QAM8001/2 64-QAM8002/3 ConstellationCyclic prefix, ns Code rate

57. Submission September 2004 doc.: IEEE 802.11-04/0935r3 S. Coffey, et al., WWiSE group Slide 57 WWiSE patent position

58. Submission September 2004 doc.: IEEE 802.11-04/0935r3 S. Coffey, et al., WWiSE group Slide 58 WWiSE Patent Position Essential patent claims owned or controlled by WWiSE companies will be available on zero royalty basis –Important information on terms & conditions available at http://www.wwise.org/IPinformation.htm http://www.wwise.org/IPstatement.htm IEEE strictly limits discussion of licensing terms & conditions at IEEE meetings –WWiSE representatives can answer any questions outside of IEEE meetings –Please feel free to contact any of the WWiSE representatives shown on next slide…

59. Submission September 2004 doc.: IEEE 802.11-04/0935r3 S. Coffey, et al., WWiSE group Slide 59 For More Information… Visit WWiSE website: –www.wwise.org Or contact: –Rolf DeVegtrolfdevegt@airgonetworks.com –Neil Hamadynhamady@bermai.com –Chris Hansenchansen@broadcom.com –Jim Zyrenjim.zyren@conexant.com –Thomas Chouthomasc@realtek.com –George Vlantisgeorge.vlantis@st.com –Bill Carneybill.carney@ti.com

60. Submission September 2004 doc.: IEEE 802.11-04/0935r3 S. Coffey, et al., WWiSE group Slide 60 References and further information 1.IEEE 802.11/04-0886-03-000n, “WWiSE group PHY and MAC specification.” 2.IEEE 802.11/04-0877-04-000n, “WWiSE proposal response to functional requirements and comparison criteria.” See also www.wwise.org Or send email to info@wwise.org