Markov Modeling of the Channel for HEW System Level Simulations

May 2014 doc.: IEEE 11-14/0598r0 Uplink multi-user MAC protocol for 11ax Date: 2014-05-11 Authors: Name Affiliations Address Phone Email Tran Thi Thao Nguyen Kyushu Institute of Technology 820-8502 Kawazu 680-4, Iizuka City, Fukuoka Japan +81-948-29-7692 [email protected] Leonardo Lanante Kyushu Institute of Technology 820-8502 Kawazu 680-4, Iizuka City, Fukuoka Japan +81-948-29-7692 [email protected] Hiroshi Ochi Kyushu Institute of Technology

820-8502 Kawazu 680-4, Iizuka City, Fukuoka Japan +81-948-29-7692 [email protected] Tatsumi Uwai Radrix co.ltd 820-8502 Incubation Facilities, Kawazu 680-4, Iizuka City, Fukuoka Japan +81-948-29-7937 [email protected] Yuhei Nagao Radrix co.ltd 820-8502 Incubation Facilities, Kawazu 680-4, Iizuka City, Fukuoka Japan +81-948-29-7937 [email protected] Submission Slide 1 Tran Thi Thao Nguyen, Kyushu Institute of Technology May 2014 doc.: IEEE 11-14/0598r0

Abstract The support for Uplink multi-user (UL MU) for 802.11ax is currently unclear. However, numerous studies have shown the benefit UL MU schemes in high-density environments. This presentation aims to start the discussion to formally support UL MU in 802.11ax. We also present a simple UL MU MAC Protocol to support our objective. Submission Slide 2 Tran Thi Thao Nguyen, Kyushu Institute of Technology May 2014 doc.: IEEE 11-14/0598r0 Background In a highly dense Wireless LAN environment, many collisions occur reducing the total network throughput and possibly lead to congestive collapse. Collision Figure 1: Multi-user transmit their data to AP at the same time[1] Submission Slide 3 Tran Thi Thao Nguyen, Kyushu Institute of Technology May 2014 doc.: IEEE 11-14/0598r0 Background Uplink Multi-user transmission reduces collision and hence the total throughput by allowing multiple transmission in a single TXOP. Multi-user transmission can be done in the

frequency or spatial domain. This figure is the result of combination of the OFDMA access and a CSMA scheme to improve efficiency. By adjusting the number of sub-channels, as the number of stations grows maintain a higher throughput than CSMA/CA based schemes. M: Number of subchannels Hybrid: OFDMA/CSMA Figure 2: Benefit of UL MU (OFDMA) in frequency domain [2] Submission Slide 4 Tran Thi Thao Nguyen, Kyushu Institute of Technology May 2014 doc.: IEEE 11-14/0598r0 Uplink Multi-user Transmission Definition Users transmit their data to an AP at the same time. [3] Type of uplink multi-user transmission Type Application Frequency Domain Multiplexing (FDM) OFDMA in a channel or in multiple channels such as LTE or WiMAX

Spatial Domain Multiplexing (SDM) Code Domain Multiplexing (CDM) Hybrid Multiplexing Submission UL MU MIMO such as LTE UL feedback in cellular network such as 3G cellular E.g. IDMA, CDMA E.g. Multicarrier-CDMA, OFDMIDMA Slide 5 Tran Thi Thao Nguyen, Kyushu Institute of Technology May 2014 doc.: IEEE 11-14/0598r0 UL MU MAC Protocol The benefit of UL MU can be easily demonstrated by the figure below DIFS+Backoff SIFS DIFS+Backoff DL MU frame SIFS DL MU frame AP AP

User1 UL ACK User1 User2 UL ACK User2 User3 UL ACK User4 UL ACK Time UL ACK UL ACK UL ACK User3 UL ACK User4 Time Figure 3a: UL MU Figure 3b: Conventional However, the benefit of this scenario is limited because it is highly dependent on the transmitted DL frame. Submission

Slide 6 Tran Thi Thao Nguyen, Kyushu Institute of Technology May 2014 doc.: IEEE 11-14/0598r0 UL MU MAC Protocol for general case Data transmission opportunities are signaled by the AP. DIFS+Backoff AP schedules UL MU Traffic STA inform the AP of transmission intent via a short request packet SIFS SIFS SIFS SIFS SIFS AP User2 User3 SIFS UL resource Scheduling info Sync User1

Resource request UL MU Frame Resource request UL MU Frame Resource request UL MU Frame Resource request User4 Figure 4: An example of stand-alone UL data frame - UL MU Transmission UL MU Frame Time Many UL MU MAC protocol in literature follows this protocol [2][3] In this protocol, the sequence is initiated by the AP similar to a point coordinator in PCF. We refer to this as centralized UL MU Submission Slide 7 Tran Thi Thao Nguyen, Kyushu Institute of Technology May 2014 doc.: IEEE 11-14/0598r0 Our ideas

A UL MU MAC Protocol should be Applicable to many scenarios to maximize its effect. Initiated by a participating STA and not the AP. Users that obtain TXOP should be able to send right away regardless of UL MU is used or not. If UL MU is used, users with TXOP dont have to wait for UL transmission timing. It means each users can initiate UL MU data frame transmission without any control from AP. We call this kind of protocol as Distributed UL MU. In contrast, in the case of Centralized UL MU protocol, frame transmission timing is always come from the AP. Minimal overhead Applicable in DCF/EDCA. Submission Slide 8 Tran Thi Thao Nguyen, Kyushu Institute of Technology May 2014 doc.: IEEE 11-14/0598r0 Environment scenario BSS AP Group1 User1 User2 User3 User7 User4 User5 User6 Group 2 Figure 5: Environment scenario Submission

Slide 9 Grouping concept here is the same as 11ac DL MU-MIMO grouping. User1 User2 User3 User4 User5 User6 User7 11ax Users supporting UL MU belonging to Group 1 11ax Users supporting UL MU belonging to Group 2 Legacy device Tran Thi Thao Nguyen, Kyushu Institute of Technology May 2014 doc.: IEEE 11-14/0598r0 Distributed UL MU frame transmission (Example) Scenario 1 : UL MU permitted - Transmission sequence - BSS BSS AP RTS AP Group1 G CTS User7

User1 User2 User3 User4 User5 User6 Group 2 Group1 User1 User2 User3 G ACK User7 BSS AP Group1 UL MU Frame Figure 6a: RTS and GroupCTS exchange User1 User2 User3 User7 User4 User5 User6 Group 2 Figure 6c: GroupACK transmission User4 User5 User6

Group 2 Figure 6b: UL MU Frame transmission Submission Slide 10 Tran Thi Thao Nguyen, Kyushu Institute of Technology May 2014 doc.: IEEE 11-14/0598r0 Distributed UL MU frame transmission (Example) Scenario 1 : UL MU permitted - Timing Diagram DIFS+Backoff SIFS SIFS SIFS G CTS DIFS+Backoff G ACK AP UL MU Frame GID1 User1 GID1 User2 RTS UL MU Frame UL MU Frame GID1 User3 Time

Figure 7: An example of Distributed UL MU frame transmission GID1 Submission Group 1 Slide 11 G CTS CTS frame with Group ID for UL G ACK ACK frame with Group ID for UL MU Frame Tran Thi Thao Nguyen, Kyushu Institute of Technology May 2014 doc.: IEEE 11-14/0598r0 Distributed UL MU frame transmission (Example) Scenario 2 : UL MU not permitted - Transmission sequence - BSS BSS AP RTS AP Group1 CTS User7

User1 User2 User3 User4 User5 User6 Group 2 Group1 User1 User2 User3 ACK User7 BSS AP Group1 UL Frame Figure 8a: RTS and CTS exchange User1 User2 User3 User7 User4 User5 User6 Group 2 Figure 8c: ACK transmission User4

User5 User6 Group 2 Figure 8b: UL Frame transmission Submission Slide 12 Tran Thi Thao Nguyen, Kyushu Institute of Technology May 2014 doc.: IEEE 11-14/0598r0 Distributed UL MU frame transmission (Example) Backward compatibility When any legacy device use RTS, the 11ax AP will always send normal CTS for backward compatibility. Hence, a normal RTS/CTS frame exchange will occur. When any legacy device hear a distributed UL MU sequence, it will be as if a normal RTS/CTS frame exchange has occurred. Submission Slide 13 Tran Thi Thao Nguyen, Kyushu Institute of Technology May 2014 doc.: IEEE 11-14/0598r0 Summary Centralized Advantages Disadvantage s

Submission Distributed - Guarantees latency. - Might have better theoretical performance benefit than distributed. - Low overhead - Symmetric with current 802.11ac DL MU scheme. - High overhead - Effect is dependent on whether - Neighbor BSSes operating users within the same group have in the same mode will the same traffic characteristics. hinder performance. Slide 14 Tran Thi Thao Nguyen, Kyushu Institute of Technology May 2014 doc.: IEEE 11-14/0598r0 New frame type definition The function same as 11ac CTS or ACK, but is for a Group. G CTS frame ( Same control frame Subtype as CTS) Frame Control Duration Duration RA FCS

b0 - b5 b6 Indication of group ID b47 Duration Predefine pattern Used to differentiate between CTS and G CTS G ACK frame Frame Control Duration Duration RA GroupFCS ACK Bitmap FCS New control frame Subtype Submission Slide 15 Tran Thi Thao Nguyen, Kyushu Institute of Technology May 2014 doc.: IEEE 11-14/0598r0 Conclusion and Future Work

We show a UL MU MAC Protocol which has low overhead and easily applicable in frequency domain or spatial domain UL MU. We plan to show MAC simulation results of the proposed scheme in a future contribution. Submission Slide 16 Tran Thi Thao Nguyen, Kyushu Institute of Technology May 2014 doc.: IEEE 11-14/0598r0 Straw Poll Do you agree that TGax should support a mode of uplink multi-user transmission ? Yes No Abstain Submission Slide 17 Tran Thi Thao Nguyen, Kyushu Institute of Technology May 2014 doc.: IEEE 11-14/0598r0 Straw Poll Do you agree that any proposal for uplink multi-user transmission protocol for TGax should be a distributed type of protocol ? Yes No Abstain Submission

Slide 18 Tran Thi Thao Nguyen, Kyushu Institute of Technology May 2014 doc.: IEEE 11-14/0598r0 References [1] WLAN components (Data Communications and Networking), what-when-how In Depth Tutorials and Information, http://what-when-how.com/data-communications-andnetworking/wlan-components-data-communications-and-networking/ [2] Yaser Pourmohammadi Fallah, Salman Khan, Panos Nasiopoulos, Hussein Alnuweiri, Hybrid OFDMA/CSMA Based Medium Access Control for Next-Generation Wireless LANs, IEEE Communications Society ICC 2008 [3] Jinyoung Chun, Wookbong Lee, Uplink multi-user transmission, 11-13/1388r0, LG Electronics Submission Slide 19 Tran Thi Thao Nguyen, Kyushu Institute of Technology

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