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Doc.: IEEE 802.11-14/0883r2 Submission September 2014 PHY SIG Frame Structure for IEEE 802.11aj (45GHz) Authors/contributors: Date: 2014-09-09 Presenter:

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Presentation on theme: "Doc.: IEEE 802.11-14/0883r2 Submission September 2014 PHY SIG Frame Structure for IEEE 802.11aj (45GHz) Authors/contributors: Date: 2014-09-09 Presenter:"— Presentation transcript:

1 doc.: IEEE 802.11-14/0883r2 Submission September 2014 PHY SIG Frame Structure for IEEE 802.11aj (45GHz) Authors/contributors: Date: 2014-09-09 Presenter: Haiming Wang

2 doc.: IEEE 802.11-14/0883r2 Submission September 2014 Shiwen He, Haiming Wang Slide 2 Abstract The submission presents the physical layer (PHY) SIG frame structure to enable downlink multi-user MIMO WLAN communications for IEEE 802.11aj (45GHz). This submission is an update version of IEEE 802.11- 14/0883r0 which was presented in July 2014 plenary session. −MCS −CRC −Midamble

3 doc.: IEEE 802.11-14/0883r2 Submission September 2014 Shiwen He, Haiming Wang Slide 3 Background 1.Challenges of future WLAN −Limited spectrum resources −Requirement for very high data rate 2.Features of future WLAN –Large bandwidth –Multiple channel mode –Multi-user –Multi-stream –Beyond 10 Gbps throughput

4 doc.: IEEE 802.11-14/0883r2 Submission September 2014 Shiwen He, Haiming Wang Slide 4 Technology Objects Technical goal: –Dynamic BW –Multi-user & Multi-stream –Energy efficiency –Scrambler –Single-Carrier & OFDM Dynamic BW –Dynamic channel BW selection for 1080 MHz BSS to enhance the adaptability in different channel environments and improve spectral efficiency.

5 doc.: IEEE 802.11-14/0883r2 Submission September 2014 Shiwen He, Haiming Wang Slide 5 Technology Objects Multi-user & Multi-stream Achieve a multi-user multi-stream control to obtain the multiplexing gain. Energy efficient communication Achieve energy efficient communication, i.e., allow non-AP STAs in TXOP power save mode to enter Doze state during a TXOP. Scrambler Scrambling effectively reduces the PAPR in OFDM system. Single carrier & OFDM Switch between SC and OFDM.

6 doc.: IEEE 802.11-14/0883r2 Submission September 2014 Shiwen He, Haiming Wang Slide 6 SIG-A structure The SIG-A field carries information required to interpret PPDUs. To support more types of MCSs, the number of the bits in the MCS field is increased to 4 from 3. To track the change of CSI, a midamble field is added to indicate the transmission style of the training field in SC PHY. The study in [1] has revealed that CRC-8 with the generator 0x83=x 8 +x 2 +x+1 is enough to check the SIG-A fields.

7 doc.: IEEE 802.11-14/0883r2 Submission September 2014 Shiwen He, Haiming Wang Slide 7 Explanation of each field in SIG-A Scrambler BitFieldsNumber of BitsDescription B0-B6 Scrambler Initialization 7 The initial scrambler state. B7SC/OFDM1 Set to 0 if SC transmission is adopted for PPDU, set to 1 if OFDM transmission is adopted for PPDU. B8BW1 Set to 0 for 540MHz, set to 1 for 1080MHz. B9 Dynamic Bandwidth 1 If BW=1 and Duplicate=1: set Dynamic Bandwidth to 1 for allowing dynamic bandwidth; set to 0 for non allowing dynamic bandwidth. Otherwise set to 0; (Reserved) B10-B11Sub-Band2 Bitmap (B10-B11): If Dynamic Bandwidth=1, set to 10 for using the primary 540MHz channel, set to 01 for using the secondary 540MHz channel; set to 11 for using 1080MHz channel; Otherwise set to 00 (reserved).

8 doc.: IEEE 802.11-14/0883r2 Submission September 2014 Shiwen He, Haiming Wang Slide 8 Explanation of each field in SIG-A SC-PHY & OFDM-PHY BitFieldsNumber of BitsDescription B0-B6 Scrambler Initialization 7The initial scrambler state. B7SC/OFDM1 Set to 0 if SC transmission is adopted for PPDU, set to 1 if OFDM transmission is adopted for PPDU. B8BW1Set to 0 for 540MHz, set to 1 for 1080MHz. B9 Dynamic Bandwidth 1 If BW=1 and Duplicate=1: set Dynamic Bandwidth to 1 for allowing dynamic bandwidth; set to 0 for non allowing dynamic bandwidth. Otherwise set to 0; (Reserved) B10-B11Sub-Band2Bitmap (B10-B11): If Dynamic Bandwidth=1, set to 10 for using the primary 540MHz channel, set to 01 for using the secondary 540MHz channel; set to 11 for using 1080MHz channel; Otherwise set to 00 (reserved).

9 doc.: IEEE 802.11-14/0883r2 Submission September 2014 Shiwen He, Haiming Wang Slide 9 Explanation of each field in SIG-A BitFields Number of Bits Description B0-B6 Scrambler Initializati on 7The initial scrambler state. B7SC/OFDM1 Set to 0 if SC transmission is adopted for PPDU, set to 1 if OFDM transmission is adopted for PPDU. B8BW1Set to 0 for 540MHz, set to 1 for 1080MHz. B9 Dynamic Bandwidth 1 If BW=1 and Duplicate=1: set Dynamic Bandwidth to 1 for allowing dynamic bandwidth; set to 0 for non allowing dynamic bandwidth. Otherwise set to 0; (Reserved) B10-B11Sub-Band2Bitmap (B10-B11): If Dynamic Bandwidth=1, set to 10 for using the primary 540MHz channel, set to 01 for using the secondary 540MHz channel; set to 11 for using 1080MHz channel; Otherwise set to 00 (reserved). Dynamic bandwidth

10 doc.: IEEE 802.11-14/0883r2 Submission September 2014 Shiwen He, Haiming Wang Slide 10 Explanation of each field in SIG-A Multi-user & Multi-stream BitFieldsNumber of BitsDescription B12-B29Length18 SU ： Number of data octets in the PSDU, Range 1- 162143; MU ： Maximum number of data octets in the PSDU of all users, Range 1-162143. B30STBC1 For an SU PPDU: set to 1 if space time block coding is used and set to 0 otherwise. For a MU PPDU: set to 0. B31-B36GroupID6 Set to the value of the TXVECTOR parameter GROUP_ID. A value of 0 or 63 indicates a SU PPDU; otherwise, indicates a MU PPDU. B37Aggregation1Set to 1 indicate that the PPDU in the data portion of the packet contains an A-MPDU; otherwise, set to 0.

11 doc.: IEEE 802.11-14/0883r2 Submission September 2014 Shiwen He, Haiming Wang Slide 11 Explanation of each field in SIG-A Multi-user & Multi-stream BitFieldsNumber of BitsDescription B38-B40Midamble3 For SC transmission, transmit an SCTF block every specified number of data blocks; For OFDM transmission, this field is undefined. B41-B51NSTS/Partial AID 11For a MU PPDU: NSTS is divided into 4 user positions of 2 bits each. User position, where, uses bits B(38+) to B(39+). The number of space time streams for user are indicated at user position =USER position[ ], where….,NUM-USERS-1, and the notation A[b] denotes the value of array A at index b. Zero space-time streams are indicated at positions not listed in the USER_POSITION array. Each user position is set as follows: Set to 0 for 0 space-time streams Set to 1 for 1 space-time stream Set to 2 for 2 space-time streams B46-B48 ： set to zero, reserved For a SU PPDU: B38-B39 Set to 0 for 1 space-time stream Set to 1 for 2 space-time streams Set to 2 for 3 space-time streams Set to 3 for 4 space-time streams B40-B48 Partial AID: Set to the value of the TXVECTOR parameter PARTIAL_AID. Partial AID provides an abbreviated indication of the intended recipient(s) of the PSDU.

12 doc.: IEEE 802.11-14/0883r2 Submission September 2014 Shiwen He, Haiming Wang Slide 12 Explanation of each field in SIG-A Multi-user & Multi-stream BitFieldsNumber of BitsDescription B52-B55SU MCS4 For a SU PPDU: MCS index For a MU PPDU: reserved B56Precoded1 For a SU PPDU: Set to 1 if a Beam-forming steering matrix is applied to the waveform in an SU transmission as described in TBD, set to 0 otherwise. For a MU PPDU: Reserved and set to 1 B57-B63Reserved7Reserved bits B64-B71CRC8SIG-A check sequence. Definition of this field calculation is in TBD.

13 doc.: IEEE 802.11-14/0883r2 Submission September 2014 Shiwen He, Haiming Wang Slide 13 Transmitter Block Diagram for SIG-A fields Using SC Transmission The SIG-A field carries information required to interpret PPDUs transmission. The SIG-A field is transmitted using the SC PHY mode.

14 doc.: IEEE 802.11-14/0883r2 Submission September 2014 Shiwen He, Haiming Wang Slide 14 SIG-B structure BitFieldsNumber of BitsDescription B0-B6Scrambler Initialization7The initial scrambler state. B7-B10MU MCS4MU MCS index. B11-B28Length18 Number of data octets in the PSDU, Rang 1-162143. B29-B31Reserved3Reserved bits. B32-B39CRC8SIG-B check sequence. Definition of this field calculation is in TBD. The SIG-B field carries information required to interpret PPDUs in MU transmission case.

15 doc.: IEEE 802.11-14/0883r2 Submission September 2014 Shiwen He, Haiming Wang Slide 15 Transmitter Block Diagram for SIG-B fields Using OFDM MU PPDU Transmission The SIG-B field carries information required to interpret PPDUs in MU transmission case. In other word, the SIG- B field is only transmitted for the MU case.

16 doc.: IEEE 802.11-14/0883r2 Submission September 2014 Shiwen He, Haiming Wang Slide 16 Reference [1] P. Koopman,T. Chakravarty, Cyclic Redundancy Code (CRC) Polynomial Selection For Embedded Networks, The International Conference on Dependable Systems and Networks, DSN-2004. [2] PHY SIG Frame Structure for IEEE 802.11aj (45GHz), IEEE 802.11- 14/0883r0 [3] PPDU Format for IEEE 802.11aj (45GHz), IEEE 802.11-14/1082r0

17 doc.: IEEE 802.11-14/0883r2 Submission September 2014 Shiwen He, Haiming Wang Slide 17 Thanks for Your Attention.

18 doc.: IEEE 802.11-14/0883r2 Submission September 2014 Shiwen He, Haiming Wang Slide 18 1.What is the motivation for the design of our SIG? The main role of our SIG is to carry information which is required to interpret the physical protocol data unit (PPDU). The basic required information to carry is listed as: −Dynamic bandwidth −Multi-user & Multi-stream −Energy efficiency −Scrambler initialization −Single & Multi-carrier Questions & Replies

19 doc.: IEEE 802.11-14/0883r2 Submission September 2014 Shiwen He, Haiming Wang Slide 19 2.What is the difference between VHT-SIG and our SIG? The scrambler initialization field is included in our SIG, which is located in the service field that is removed in IEEE 802.11ac, due to the motivation of further enhancement of reducing the PAPR of SIG and reducing the SIG transmission overhead, such as the transmission of SIG-B in single user transmission for IEEE 802.11aj (45GHz). The indication of the dynamic bandwidth is also included in the SIG field. A subfield which indicates the modulated model is added in the SIG field. Questions & Replies

20 doc.: IEEE 802.11-14/0883r2 Submission September 2014 Shiwen He, Haiming Wang Slide 20 3.What are the key features of the SIG? Re: The key features of the SIG are listed as follows: ① Scrambler initialization: reducing the PAPR. ② Dynamic bandwidth: improving the spectral efficiency. ③ Multi-user & Multi-stream: enhancing the system capacity. ④ Energy efficiency: reducing the power consumption. ⑤ SC & OFDM: considering the PAPR and the power amplifier efficiency due to the fact that, in some cases, the power efficiency is more important than the spectral efficiency in the mmWave WLAN systems. Questions & Replies

21 doc.: IEEE 802.11-14/0883r2 Submission September 2014 Shiwen He, Haiming Wang Slide 21 4.How to support more MCSs? Re: To support more MCSs, the number of the bits in the MCS field is increased to 4 from 3. Combining with SC/OFDM field, IEEE 802.11aj(45GHz) can support 32 MCSs. Questions & Replies

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