Samsung MAC Proposal Presentation Aug 2004 doc.: IEEE 802.11-02/0917r2 August 2004 SAMSUNG 11n MAC Samsung MAC Proposal Presentation Kyunghun Jang, Samsung, et al Kyunghun Jang, Samsung, et al

Authors and Contributors August 2004 Authors and Contributors Kyunghun Jang (khjang@samsung.com) Youngsoo Kim (kimyoungsoo@samsung.com) Jin-Bong Chang (jinb.chang@samsung.com) Dongjun Lee (djthekid.lee@samsung.com) Jon Rosdahl (jon.rosdahl@partner.samsung.com) Changyeul Kwon (cy.kwon@samsung.com) Chil-Youl Yang (hacky710@samsung.com) SukJin Yun (sj.yun@samsung.com) Seyoung Shin (shinsy01@samsung.com) Kyungik Cho (kyungik.cho@samsung.com) Sunghyun Choi (schoi@snu.ac.kr) Seongkwan Kim (skim@mwnl.snu.ac.kr) Tae-Jin Lee (tjlee@ece.skku.ac.kr) Duck-Yong Yang (ducky@ece.skku.ac.kr) Hyung-Wook Yoon (hwyoon@ece.skku.ac.kr) Kyunghun Jang, Samsung, et al

Samsung MAC Proposal Samsung MAC Proposal FRCC compliance August 2004 Samsung MAC Proposal Samsung MAC Proposal FRCC compliance 11-04-0920-00-000n Samsung MAC Proposal Technical Specification 11-04-0918-01-000n Samsung MAC Proposal Results 11-04-0919-00-000n Samsung MAC Proposal CC Summary 11-04-0921-00-000n Kyunghun Jang, Samsung, et al

Contents Summary of New MAC Features Two-level Frame Aggregation Aug 2004 doc.: IEEE 802.11-02/0917r2 August 2004 Contents Summary of New MAC Features Two-level Frame Aggregation MP-Frame: Aggregation Control Smart Block ACK Error Recovery Mechanisms Operating Modes Kyunghun Jang, Samsung, et al Kyunghun Jang, Samsung, et al

New MAC Features (1) Two-level frame aggregation August 2004 New MAC Features (1) Two-level frame aggregation Supports multiple destinations and multiple rates in a PPDU MAC header compression Allows more efficient medium usage when multiple MPDUs are aggregated in a PSDU A service period for aggregation exchanges Initiated by MP frame and is combined with dynamic TDM and CSMA/CA without collision and unnecessary backoff delay Kyunghun Jang, Samsung, et al

New MAC Features (2) Smart Block ACK Three error recovery mechanisms August 2004 New MAC Features (2) Smart Block ACK Uses a two-level bitmap with a variable size instead of a fixed 128 octets as in the 802.11e Block ACK Three error recovery mechanisms Used with the two-level frame aggregation mechanism Operating modes For coexistence between legacy STAs and HT STAs Kyunghun Jang, Samsung, et al

Two-level Frame Aggregation August 2004 Two-level Frame Aggregation MAC Header DA1:TID1 MSDU F C S MAC Header DA1:TID1 MSDU F C S MAC Header DA1:TID2 MSDU F C S MAC Header DA2:TID1 MSDU F C S MPDU Aggregate PSDU M D PSDU DATA MPDU M D CH-type1 MPDU M D CH-type2 MPDU M D PSDU DATA MPDU Preamble/ PLCP Header P D PSDU P D PSDU Aggregate PPDU rate1 rate2 basic rate MD : MPDU Delimiter, PD : PSDU Delimiter Kyunghun Jang, Samsung, et al

Compressed MAC Header (CH) August 2004 Compressed MAC Header (CH) CH-type1 MPDU CH-type2 MPDU Octets: 2 6 2 6 0 ~ 2304 4 Frame Control Address 3 Sequence Control Address 4 (if needed) MSDU FCS Octets: 2 6 2 6 2 0 ~ 2304 4 Frame Control Address 3 Sequence Control Address 4 (if needed) QoS Control MSDU FCS Kyunghun Jang, Samsung, et al

MPDU and PPDU Delimiters August 2004 MPDU and PPDU Delimiters MD (4 octets) PD (2 symbols) Bits: 4 12 8 8 Reserved MPDU length CRC Unique Pattern Bits: 2 16 6 8 16 Reserved PSDU length MCS CRC Unique Pattern Kyunghun Jang, Samsung, et al

Preamble/PLCP header Structure August 2004 Preamble/PLCP header Structure Symbols : 2 2 1 1 1/2 TBD Legacy-STF Legacy-LTF Legacy-SIG HT-SIG HT-STF HT-LTF Bits: 4 1 12 1 6 Bits: 4 13 1 6 Rate reserved Length Parity Tail Antenna Config. reserved Parity Tail Kyunghun Jang, Samsung, et al

Format of MultiPoll Frame August 2004 Format of MultiPoll Frame Dur/ID BSSID Frame control octets : 2 2 6 D/L Count(n) U/L Count(m) D/L MAP 5 * n U/L MAP 4 * m AID Length MCS 14bit 16bit 6bit Antenna Config 4bit QoS Control Recommended Rate TID No TID 3bit 1bit AAI TxOPLimit 8bit FCS 4 * MCS: Modulation Coding Scheme * AAI: Aggregated ACK Indicator Kyunghun Jang, Samsung, et al

MP-Frame: Aggregation Control August 2004 MP-Frame: Aggregation Control D/L MAP AID LENGTH MCS HT STA1 length1 rate1 HT STA2 length2 rate2 U/L MAP AID QoS ctrl Recom. Rate HT STA1 qos1 rate1 HT STA2 qos2 rate2 HT STA3 qos3 rate3 Dynamic TDM CSMA/CA MP Aggregate PSDU Aggregate PSDU CF- END HT AP Aggregate PPDU Aggregate PSDU HT STA 1 TXOP Limit 1 HT STA 2 Aggregate PSDU 2 1 HT STA 3 TXOP Limit DATA NAV 4 3 Non-polled (HT) STA 4 2 1 Service Period PIFS PIFS DIFS DIFS PIFS AIFS[AC] Kyunghun Jang, Samsung, et al

Long NAV for Aggregation Exchanges August 2004 Long NAV for Aggregation Exchanges Dynamic TDM CSMA/CA MP Aggregate PSDU Aggregate PSDU CF- END HT AP Aggregate PPDU Aggregate PSDU HT STA 1 Set NAV TXOP Limit Reset NAV 1 HT STA 2 Aggregate PSDU HT STA 3 2 1 TXOP Limit Non-polled (HT) STA 4 NAV Shrinking 4 3 Service Period PIFS PIFS DIFS DIFS PIFS AIFS[AC] Kyunghun Jang, Samsung, et al

Smart Block ACK Frames Smart Block ACK Request (SBAR) MPDU August 2004 Smart Block ACK Frames Smart Block ACK Request (SBAR) MPDU Smart Block ACK (SBA) MPDU 2 octets 2 octets 6 octets 6 octets 2 octets 2 octets 4 octets Frame Control Duration RA TA BAR Control Block Ack Starting Sequence Control FCS Reserved SSBAR TID SSBAR: Selective SBAR SSBAR=1 : Implicit Error Recovery 11 bits 1 bits 4 bits 2 octets 2 octets 6 octets 6 octets 2 octets 2 octets 8 octets 2*n octets 4 octets Frame Control Duration RA TA BA Control BA Starting Sequence Control BA MSDU Bitmap BA Erroneous MSDU Bitmap FCS A Last SN NA Reserved TID Bits : 1 6 1 4 4 Kyunghun Jang, Samsung, et al

August 2004 SBA MPDU First bit, “A”, in the BA control field, indicates whether all MSDUs have been successfully received, up to the MSDU with 6 bits of a sequence number in the Last SN subfield. “NA” bit in the BA control field, indicates no packet has been successfully received. Bm bit, in 8 octet BA MSDU Bitmap field, indicates whether all the fragmented MPDUs with SN = (BA Starting Sequence Control + m) have been successfully received or not. The total number (n) of following BA erroneous MSDU Bitmap equals to the number of zero bits in BA MSDU Bitmap field. The order of subsequent BA erroneous MSDU Bitmap follows the order of zero bits in the BA MSDU Bitmap. Kyunghun Jang, Samsung, et al

Example of Smart Block ACK (1) August 2004 Example of Smart Block ACK (1) Fragmented MSDU with SN = 10 Fragmented MSDU with SN = 11 Fragmented MSDU with SN = 12 10-1 10-2 10-3 10-4 11-1 11-2 11-3 12-1 12-2 12-3 12-4 12-5 Corresponding Smart Block ACK Octets: 2 2 6 6 2 2 4 Frame Control Duration RA TA BA Control SN = 10 FCS 1 12 reserved TID Bits : 1 6 1 4 4 Kyunghun Jang, Samsung, et al

Example of Smart Block ACK (2) August 2004 Example of Smart Block ACK (2) Fragmented MSDU with SN = 10 Fragmented MSDU with SN = 11 Fragmented MSDU with SN = 12 10-1 10-2 10-3 10-4 11-1 11-2 11-3 12-1 12-2 12-3 12-4 12-5 Corresponding Smart Block ACK Octets: 2 2 6 6 2 2 8 2 2 4 Frame Control Duration RA TA BA Control SN = 10 1 … BA Erroneous MSDU Bitmap of SN = 11 BA Erroneous MSDU Bitmap of SN = 12 FCS BA MSDU Bitmap 12 reserved TID 1 1 … 1 1 1 … BA control BA Erroneous MSDU Bitmap of SN = 11 BA Erroneous MSDU Bitmap of SN = 12 Kyunghun Jang, Samsung, et al

Example of Smart Block ACK (3) August 2004 Example of Smart Block ACK (3) Fragmented MSDU with SN = 10 Fragmented MSDU with SN = 11 Fragmented MSDU with SN = 12 10-1 10-2 10-3 10-4 11-1 11-2 11-3 12-1 12-2 12-3 12-4 12-5 Corresponding Smart Block ACK Octets: 2 2 6 6 2 2 8 2 4 Frame Control Duration RA TA BA Control SN = 10 1 … BA Erroneous MSDU Bitmap of SN =11 FCS BA MSDU Bitmap 1 … 11 reserved TID BA Erroneous MSDU Bitmap of SN = 11 BA control Kyunghun Jang, Samsung, et al

Error Recovery Mechanisms August 2004 Error Recovery Mechanisms MP-Frame: Immediate Error Recovery MP-Frame: Coordinated Error Recovery MP-Frame: Implicit Error Recovery Kyunghun Jang, Samsung, et al

MP-Frame: Immediate Error Recovery August 2004 MP-Frame: Immediate Error Recovery Within TXOP limit Within TXOP limit 1 2 1 2 1 Preamble PLCP MP-Frame Preamble PLCP Data MPDU Data MPDU SBAR MPDU Data MPDU Data MPDU SBAR MPDU Preamble PLCP SBA MPDU Data MPDU SBAR MPDU Preamble PLCP SBA MPDU Preamble PLCP SBA MPDU Preamble PLCP CF-END frame HT AP Retransmission 11 12 Preamble PLCP SBA MPDU Data MPDU Data MPDU SBAR MPDU Preamble PLCP SBA MPDU STA1 AAI = 0 Retransmission 21 22 21 Preamble PLCP SBA MPDU Data MPDU Data MPDU SBAR MPDU Preamble PLCP Data MPDU SBAR MPDU STA2 1 AAI = 0 PIFS DIFS SIFS SIFS DIFS SIFS SIFS SIFS PIFS Kyunghun Jang, Samsung, et al

MP-Frame: Coordinated Error Recovery August 2004 MP-Frame: Coordinated Error Recovery Error Recovery Phase 1 2 1 2 2 Preamble PLCP MP-Frame Preamble PLCP Data MPDU Data MPDU SBAR MPDU Data MPDU Data MPDU SBAR MPDU Preamble PLCP MP-Frame Preamble PLCP SBA MPDU Data MPDU SBAR MPDU SBA MPDU Preamble PLCP SBA MPDU Preamble PLCP CF-END frame HT AP Retransmission 11 12 Preamble PLCP SBA MPDU Data MPDU Data MPDU SBAR MPDU Preamble PLCP SBA MPDU STA1 AAI = 1 Retransmission 21 22 21 Preamble PLCP SBA MPDU Data MPDU Data MPDU SBAR MPDU Preamble PLCP Data MPDU SBAR MPDU STA2 1 1 AAI = 1 PIFS DIFS DIFS PIFS PIFS DIFS DIFS PIFS PIFS Kyunghun Jang, Samsung, et al

MP-Frame: Implicit Error Recovery (1) August 2004 MP-Frame: Implicit Error Recovery (1) 1 2 1 2 1 2 2 Preamble PLCP MP-Frame Preamble PLCP Data MPDU Data MPDU SBAR MPDU Data MPDU Data MPDU SBAR MPDU Data MPDU Data MPDU SBAR MPDU Preamble PLCP Data MPDU SBAR MPDU Preamble PLCP CF-END frame HT AP SSBAR = 1 SSBAR = 0 STA 1 AAI = 0 Preamble PLCP SBA MPDU Preamble PLCP SBA MPDU STA 2 1 AAI = 0 Backoff count STA 3 2 1 AAI = 0 PIFS DIFS SIFS SIFS DIFS Kyunghun Jang, Samsung, et al

MP-Frame: Implicit Error Recovery (2) August 2004 MP-Frame: Implicit Error Recovery (2) 1 2 1 2 1 2 1 2 Preamble PLCP MP-Frame Preamble PLCP Data MPDU Data MPDU SBAR MPDU Data MPDU Data MPDU SBAR MPDU Data MPDU Data MPDU SBAR MPDU Preamble PLCP Data MPDU Data MPDU SBAR MPDU Preamble PLCP CF-END frame 1 HT AP Preamble PLCP SBA MPDU Preamble PLCP SBA MPDU SSBAR = 1 SSBAR = 0 STA 1 AAI = 0 NA = 1 STA 2 1 AAI = 0 STA 3 2 1 AAI = 0 PIFS DIFS SIFS SIFS DIFS PIFS Kyunghun Jang, Samsung, et al

Operating Modes Pure mode Mixed mode Managed mode August 2004 Operating Modes Pure mode There are only HT STAs without any legacy STAs Mixed mode There are legacy STAs and HT STAs together Protection mechanisms (CTS-to-Self, RTS/CTS) are used in the CP Managed mode HT AP can manage the access control between HT STAs and legacy STAs CP for HT STAs is assigned in CFP. Kyunghun Jang, Samsung, et al

CTS-to-Self or RTS/CTS for Contention Period (CP) August 2004 CTS-to-Self or RTS/CTS for Contention Period (CP) Legacy CTS HT Data 1 Backoff slots HT STA1 ACK Backoff slots HT STA2 NAV Backoff slots HT Others NAV Legacy STAs Backoff slots NAV AIFS[AC] SIFS SIFS AIFS[AC] Kyunghun Jang, Samsung, et al

Benefits of Legacy ACK During CP in mixed and managed mode August 2004 AIFS[AC] SIFS AIFS[AC] HT Data HT STA SRC 1 Backoff slots Legacy ACK Backoff slots HT STA DEST Legacy STAs don’t know HT Data, thus set the EIFS Backoff slots Legacy STAs EIFS In case of successful reception of legacy ACK, the EIFS is not used Kyunghun Jang, Samsung, et al

Contention-Free Period Contention-Free Repetition Interval August 2004 Managed Mode SIFS Beacon HT AP HT STAs Sub-CFP HT CP Contention Period NAV MaxCFPDuration MaxCFPDuration - HTCPDuration HT Data ACK CF- End …. LagacySTAs Contention-Free Period Contention-Free Repetition Interval Reset NAV HT transmission Legacy transmission Kyunghun Jang, Samsung, et al

August 2004 Thank You Kyunghun Jang, Samsung, et al