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Complete Proposal for 802.11ad

Complete Proposal for 802.11ad. Date: 2010-05-01. Authors:. Summary. This document proposes the PHY and MAC layer design for 802.11ad operating in the 60GHz band PHY layer design A hybrid PHY designed consisting of the SC PHY and the OFDM PHY is proposed

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Complete Proposal for 802.11ad

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  1. Complete Proposal for 802.11ad Date: 2010-05-01 Authors: Hiroshi Harada, NICT

  2. Summary • This document proposes the PHY and MAC layer design for 802.11ad operating in the 60GHz band • PHY layer design • A hybrid PHY designed consisting of the SC PHY and the OFDM PHY is proposed • Channelization of the 60GHz band is presented • Data rate modes of respective PHYs are listed • Common mode signaling bridging across two PHYs is introduced • Frame format for respective PHYs are presented • MAC layer design • Proposed MAC contains Basic MAC and Enhanced MAC • Basic MAC is based on 802.11-2007 supporting for 802.11 user experience • Enhanced MAC purposes to achieve very high throughput (>1Gbps), support directivity, and coexist with other 60GHz systems and for QoS improvement • Beamforming Hiroshi Harada, NICT

  3. Motivation of Proposal • This proposal has the following purposes of • Enhancement of 802.11 PHY and MAC to fulfill the requirements of 802.11ad system • Co-existence of other already standardized 60GHz systems such as 802.15.3c WPAN Hiroshi Harada, NICT

  4. Presentation Outline Section 1: PHY Proposal for 802.11ad • Overview of the Proposed 802.11ad PHY • Channelization • Modulation and Coding • Common Mode Signaling • SC PHY Frame Format • OFDM PHY Frame Format • PHY Simulation Results Section 2: MAC Proposal for 802.11ad • Overview of the proposed 802.11ad MAC • Enhanced MAC • Co-existence • MAC Simulation Results Hiroshi Harada, NICT

  5. Section 1: PHY Proposal for 802.11ad

  6. Abbreviations • FEC – forward error correction • MCS – Modulation and Coding Scheme • SC - Single carrier • OFDM - Orthogonal Frequency Division Multiplexing • CMS – Common Mode Signaling Hiroshi Harada, NICT

  7. Presentation Outline (PHY Layer) • Overview of the Proposed 802.11ad PHY • Channelization • Modulation and Coding • Common Mode Signaling • SC PHY Frame Format • OFDM PHY Frame Format Hiroshi Harada, NICT

  8. Overview of the Proposed 802.11ad PHY • The proposed 802.11ad PHY consists any or the combination of the following: • SC PHY • OFDM PHY • Features of the PHY modes: • The SC PHY mainly targets applications with low complexity • The OFDM PHY mainly targets applications that require higher data rates • To reduce implementation burden, both PHYs are designed to have similarities in the aspects of frame construction • To manage multi-PHY-mode management and mitigate interference, the CMS is specified to facilitate coexistence between the SC PHY and the OFDM PHY Hiroshi Harada, NICT

  9. Channelization Hiroshi Harada, NICT

  10. Overview on SC and OFDM Data Rates • The SC and OFDM classes of data rates give flexibility to various potential applications requiring data rate support from several hundreds of Mbps to several Gbps • The data rate classes are categorized as: • Class 1 – up to 1.6Gbps • Class 2 – up to 3Gbps • Class 3 – up to 7 Gbps • A Robust MCS called CMS is proposed to bridge between the SC and OFDM PHYs • In OFDM PHY, three modes with different FFT sizes are proposed for flexibility. Hiroshi Harada, NICT

  11. Timing Related Values for SC PHY Hiroshi Harada, NICT

  12. MCSs for SC PHY *Mandatory MCSs Hiroshi Harada, NICT

  13. Timing Related Values for OFDM PHY MODE 1 Hiroshi Harada, NICT

  14. Timing Related Values for OFDM PHY MODE 2 Hiroshi Harada, NICT

  15. Timing Related Values for OFDM PHY MODE 3 Hiroshi Harada, NICT

  16. MCS for OFDM PHY *FFT size: 512, 128, 64 Data rates are for FFT sizes 512 and 128. For 64, data rates are around 10% less. Hiroshi Harada, NICT

  17. MCS for Common Mode Signaling *Note that CMS is the first MCS in the SC PHY table Hiroshi Harada, NICT

  18. CMS Functional Description • CMS is the most robust and long reaching MCS in the SC PHY and is specified to bridge between the SC PHY and OFDM PHY • CMS is the mandatory MCS for all STAs • CMS is employed in procedures facilitating multi-PHY-mode network management (i.e. discovery and synchronization) and other cross-PHY procedures Hiroshi Harada, NICT

  19. Generic Frame Format • The following slides show the components of the SC PHY and OFDM PHY frames • PLCP preamble • SIGNAL • DATA • The modulation and coding schemes used in respective components are given • The generic frame format for SC PHY and OFDM PHY are the same • PLCP preamble structure for SC PHY and OFDM PHY are the same • SIGNAL field structure for SC PHY and OFDM PHY are the same Hiroshi Harada, NICT

  20. SC PHY Frame Format~ General ~ Hiroshi Harada, NICT

  21. OFDM PHY Frame Format~ General ~ Hiroshi Harada, NICT

  22. SC and OFDM PHY Frame Format~ PLCP Preamble for CMS ~ CMS Preamble Hiroshi Harada, NICT

  23. SC and OFDM PHY Frame Format~ PLCP Preamble for SC PHY and OFDM PHY ~ SC Preamble OFDM Preamble Hiroshi Harada, NICT

  24. SC and OFDM PHY Frame Format~ PLCP Preamble Golay Sequences ~ a256 = [b128 a128 ] b256 = [b128 a128 ] Hiroshi Harada, NICT

  25. PHY Frame Format~ SIGNAL ~ • PHY header (5 octets) contains • Scrambler ID (4 bits) • Information on scrambling seed • Aggregation (1 bit) • indicates whether aggregation is used • MCS (5 bits) • indicates the modulation and coding information of DATA • Frame length (20 bits) • Indicates the length of the frame • Pilot Word Length (2 bit) • indicates the type of pilot word length in DATA, ignored in OFDM PHY • Reserved (8 bits) Hiroshi Harada, NICT

  26. Results of PHY Simulation Hiroshi Harada, NICT

  27. Simulation Parameters for Single Carrier PHY Evaluation Hiroshi Harada, NICT

  28. Simulation Channel Model • AWGN channel model • Fading channel model and scenarios • Living Room (LR) • Omni to Omni LOS • Omni to Direction NLOS • Directional to Directional NLOS • Conference Room (CR) • Omni to Omni LOS • Omni to Direction NLOS • Directional to Directional NLOS • Hardware impairments are considered in the simulation. • PA/PN model with 0.5dB back-off as defined in Evaluation document Hiroshi Harada, NICT

  29. SC MCS AWGN PER 0 10 RS-BPSK PER RS-QPSK PER 1/2 LDPC-BPSK PER 3/4 LDPC-BPSK PER 1/2 LDPC-QPSK PER 3/4 LDPC-QPSK PER 7/8 LDPC-QPSK PER -1 3/4 LDPC-8PSK PER 10 3/4 LDPC-16QAM PER PER -2 10 -3 10 -2 0 2 4 6 8 10 12 14 16 CNR(dB) PER performance of SC MCSs (AWGN) Hiroshi Harada, NICT

  30. PER performance under CR/LR Omni-Omni LOS Environment CNR(dB) Hiroshi Harada, NICT

  31. PER performance under LR/CR Omni-Directional NLOS Environment CNR(dB) Hiroshi Harada, NICT

  32. PER performance under LR/CR Directional-Directional NLOS Environment CNR(dB) Hiroshi Harada, NICT

  33. Simulation Parameters for OFDM PHY Evaluation Hiroshi Harada, NICT

  34. Section 2: MAC Proposal for 802.11ad Hiroshi Harada, NICT

  35. Presentation Outline (MAC Layer) Part1: Overview of the proposed 802.11ad MAC • Concept • Basic MAC • Enhanced MAC • High level MAC operations Part2: Enhanced MAC • Contention-free period (CFP) scheduling • Enhanced data transmission • Enhanced co-existence • Directivity support Part3: MAC Simulation Results • Goodput • Delay • Packet Loss Hiroshi Harada, NICT

  36. Part1: Overview of the proposed 802.11ad MAC Hiroshi Harada, NICT

  37. Concept for Proposed 802.11ad MAC 802.11ad MAC • Proposed 802.11ad MAC contains Basic MAC to maintain 802.11 user experience, and Enhanced MACto achieve very high throughput and to support directivity and co-existence Basic MAC based on 802.11-2007 + Enhanced MAC for Very High Throughput, Directivity and Co-existence Hiroshi Harada, NICT

  38. Basic MAC • All basic functionalities of 802.11ad MAC are based on 802.11-2007 supporting for 802.11 user experience • Basic MAC functions • Scan • Association/Re-associaton/Disassociation • Authentication/Dis-authentication • Channel Accesses – DCF, PCF, HCF, HCCA • Other functions – synchronization, power management, security, etc. Hiroshi Harada, NICT

  39. Enhanced MAC • Enhanced MAC purposes to achieve very high throughput (>1Gbps), support directivity, and coexistwithother 60GHz systems and for QoS improvement • Enhanced MAC functions • Very High Throughput Achievement • Contention-Free Period (CFP) Scheduling • Enhanced data transmission in CFP • Frame aggregation & Aggregation-ACK • Bi-directional aggregation with ACK • Directivity Support • Directional association • Beamforming • Co-existence Support • Co-existence among homogeneous systems • Co-existence among heterogeneous systems Hiroshi Harada, NICT

  40. High-Level MAC Operations in 802.11ad Hiroshi Harada, NICT

  41. Part2: Details of Enhanced MAC Hiroshi Harada, NICT

  42. Contention-Free Period Scheduling • Contention-Free Period (CFP) scheduling supports enhanced data transmission • Dynamically scheduled CFP can guarantee the high throughput and delay requirements of data transmission B (Beacon) TS (Traffic Stream) CP (Contention Period) CFP(Contention Free Period) (Example of contention-free period scheduling) Hiroshi Harada, NICT

  43. Enhanced Data Transmission • Enhanced data transmission in CFP includes beamforming support, frame aggregation/aggregation-ACK, and bi-directional aggregation with ACK • Beamforing period in CFP enables to beamform without interference between Src/Dest • Frame aggregation / Aggregation-ACK/ Bi-directional aggregation with ACKguarantees QoS requirements of throughput and delay • Aggregation are performed by on-demand and negotiation between Src/Dest (Example of data transmission during CFP) Hiroshi Harada, NICT

  44. Aggregation / Aggregation ACK / Bi-directional aggregation with ACK • Proposed aggregation supports to aggregate video traffics (video aggregation MSDU, VA-MSDU) • VA-MSDU frame body consists of • MAC subheader with HCS and aggregated MSDUs with Subframe FCS (SFCS) • MAC subheader contains • Aggregated MSDUs information • Aggregation ACK (A-ACK) bitmap • VA-MSDU allows • maximum length of each MSDU (including SFCS) : 1Mbytes • maximum length of aggregated MSDUs : 16Mbytes • Bi-directional VA-MSDU by using both of aggregation and aggregation ACK bitmap SFCS (Subframe FCS)

  45. Negotiation for Aggregation • Negotiation for Aggregation • are performed for capability confirmation • can be operated in CFP or CP • are performed on-demand between Src and Dest • are performed directly between AP and STAs • are performed directly between STA and STA after Directed Link Setup (DLS) defined in 802.11-2007 Neg. DLS Neg. Neg. Case 1 : communication between AP and STAs Neg. Case 2 : communication between STA and STA Hiroshi Harada, NICT

  46. Directivity Support • Directivity support for 802.11ad system includes directional association and beamforming • Directional association • Directional beacons (up to 4 beacons) and Directional contention periods (CPs) enable STAs to associate to AP directionally • Beamforming • Beamforming protocol is based on 11/496r0 Q-beacon (Directional Quasi-omni beacon) GT (Guardtime) Hiroshi Harada, NICT

  47. Directional Association Example • AP • broadcasts beacons to the supported directions • determines the directional beacon interval appropriately • STAs • scan beacons on the supported directions • associate with AP on the directional CP Hiroshi Harada, NICT

  48. Enhanced Co-existence (1/4)- Co-existence for homogeneous systems - • Enhanced co-existence provides co-existence among homogeneous systems and among heterogeneous systems • Co-existence for homogeneous systems provides QoS assurance during CFP • Avoid mutual interference by overlapping homogenous networks to data transmission during CFP Hiroshi Harada, NICT

  49. Enhanced Co-existence (2/4)- Co-existence for homogeneous systems - • Co-existence action frame (CAF) supports to avoid mutual interference by overlapping homogenous networks to data transmission during CFP • CAF includes schedule information of CFP • STAs periodically sends out CAFs for potentially incoming homogeneous networks • STAs scan CAFs before transmitting data during CFP Hiroshi Harada, NICT

  50. Enhanced Co-existence (3/4)- Co-existence for heterogeneous systems - • There are two 60GHz unlicensed wireless system specifications in the IEEE 802 (802.15.3c and 802.11ad) • A mechanism is proposed to facilitate coexistence between 802.15.3c and 802.11ad while minimizing the additional complexity in implementation • The co-existence mechanism is based on the document 10/0231r3 (John R. Barr) and 10/0485r0(Chin-Sean Sum ) Hiroshi Harada, NICT

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