11-16-1175-00-00ay-multi-stage-multi-resolution-beamforming-training-for-802-11ay.pptx

September 2016

doc.: IEEE 802.11-16/xxxxr0

Multi-Stage, Multi-Resolution Beamforming Training for 802.11ay Date: 2016-09-12 Authors: Name

Affiliations

Kome Oteri Hanqing Lou Rui Yang

Address

Phone

email

9710 Scranton Road, San Diego, CA, 92121

+1 858.210.4826

kome.oteri@ InterDigital.com

InterDigital Communication Inc.

Xiaofei Wang

Submission

Slide 1

Kome Oteri (InterDigital)

September 2016

doc.: IEEE 802.11-16/xxxxr0

Introduction • In 802.11ay, enhancements to the 802.11ad beamforming training procedures have been agreed on for complexity reduction, efficiency and to enable MIMO BF training [1][2][3][4]. • In this contribution, we propose a multi-stage, multiresolution beamforming training (BFT) framework to further increase the BF training efficiency in scenarios with high resolution beams. • The scheme also has advantages that enable more efficient beam tracking. Submission

Slide 2

Kome Oteri (InterDigital)

September 2016

doc.: IEEE 802.11-16/xxxxr0

Current BF Agreements • The following agreements have been made to improve BF training in 802.11ay [4]: • The 11ay beamforming protocol shall • enable TX and RX training using the same BRP frame. • enable simultaneous BF training of transmit DMG antennas. • support simultaneous RX antenna training. • provide the means to enable TX sector down selection as part of beamforming training. • support, for STAs with antenna pattern reciprocity, RX sector down selection as part of beamforming training. • support a mode of operation in which, in a single phase, the initiator trains its transmit antennas/sectors and multiple responders train their receive antennas/sectors. • The 11ay beamforming protocol supports multi-beamforming for multiple array antennas. Multi-beamforming means that a transmitter simultaneously sends SSW frames in multiple polarized directions. Submission

Slide 3

Kome Oteri (InterDigital)

September 2016

doc.: IEEE 802.11-16/xxxxr0

Multi-Stage, Multi-Resolution BFT • To further increase the efficiency of the beamforming training procedure with high resolution beamforming, we propose that 802.11ay support the use of a multi-stage, multi-resolution beamforming framework [5]. • In this framework, beams of increasing angular resolution can be used at different stages of the sector sweep, beam refinement or tracking procedure.

• To support this scheme in 802.11ay, signaling should be added to indicate the capability to perform multi-stage, multi-resolution BFT and to signal resolution information such as the maximum and current beam resolutions. Submission

Slide 4

Kome Oteri (InterDigital)

September 2016

doc.: IEEE 802.11-16/xxxxr0

Multi-Stage, Multi-Resolution BFT

•

L0: Sector Level Sweep: Identify Sector of angular spread 90 degrees

•

L1: BFT Level 1: • 4 beams per sector with angular spread 22.5 degrees

•

L2: BFT Level 2: • 4 beams per beam Level 1 or 16 beams per sector with angular spread 5.625 degrees

•

L3: BFT Level 3/ Non-hierarchical BRP: • 4 beams per beam Level 2 or 64 beams per sector with angular spread 1.046 degrees. Submission

Slide 5

Kome Oteri (InterDigital)

September 2016

doc.: IEEE 802.11-16/xxxxr0

Example Sector Index beam Index 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 Feedback beam Index 19

Beam = Sector 1, beam 19

• Single Resolution beam sweep : 64 beam sweeps and 1 feedback frame Resolution Index 1

Resolution Index 2

Resolution Index 3

Resolution Index 4

Sector Index L1 Index 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 4 4 4 4 4 4 4 4 4 4 4 4 4 4 4 4 beam Index 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 Feedback L1 index = 2 L2 Index beam Index

1

1

1

1

2

2

2

2

3

3

3

3

4

4

4

4

17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32

Feedack L2 Index = 1 L3 Index beam Index

1

2

3

4

17 18 19 20

Feedback L3 Index = 3

Beam = Sector 1, L1:beam 2, L2:beam 1, L3:beam 3

• Multi-stage, Multi-resolution beam sweep: 12 beam sweeps and 3 feedback frames Submission

Slide 6

Kome Oteri (InterDigital)

September 2016

doc.: IEEE 802.11-16/xxxxr0

BFT Protocol AP

BFT

1

2

3

…

…

64

Feedback Tx Sector 19 STA1

Rx Sector 3 from AP

Single Resolution BF Training AP

BFT

1,1

1,2

1, 3

1, 4

Stage 1

STA1

AP

Feedback Tx Sector 1,2

Rx Sector 3

BFT

1,2,1

1,2,2

1,2,3

1,2,4

Stage 2

STA1

AP

Feedback Tx Sector 1,2,1

Rx Sector 3

BFT

1,2,1,1

1,2,1,2

1,2,1,3

1,2,1,4

Stage 3

STA1

Rx Sector 3

Feedback Tx Sector 1,2,1,3 = 19

Multi-stage, Multi-Resolution BF Training Submission

Slide 7

Kome Oteri (InterDigital)

September 2016

doc.: IEEE 802.11-16/xxxxr0

Advantages of Multi-Stage, MultiResolution BFT • The overall number of training beams transmitted for a narrow beam system can be reduced. This is important especially in MIMO scenarios where multiple transmit-receive pairs are needed. • Connection between the transmitter-receiver pair can be made at any stage without the need for a long wait. • The procedure can also be combined with beam down-selection.

• The initiator or responder can request training at a particular resolution level and dynamically trade-off BFT efficiency and beam accuracy. • A node can request for BFT with a resolution fallback in case of a change in the channel which is advantageous for beam tracking

Submission

Slide 8

Kome Oteri (InterDigital)

September 2016

doc.: IEEE 802.11-16/xxxxr0

Conclusion • Multi-stage Multi-resolution BFT offers improvements in BF training efficiency and beam tracking for high resolution beams. • Signaling should be added to 802.11ay to indicate the capability to perform multi-stage, multi-resolution beam tracking and to signal information such as the maximum and current beam resolutions

Submission

Slide 9

Kome Oteri (InterDigital)

September 2016

doc.: IEEE 802.11-16/xxxxr0

Straw Polls • Do you agree to add the following text into the 802.11ay SFD? • 11ay shall support multi-stage, multi-resolution beamforming training as part of the beamforming training procedure

Submission

Slide 10

Kome Oteri (InterDigital)

September 2016

doc.: IEEE 802.11-16/xxxxr0

References 1. 2.

3. 4. 5.

IEEE 802.11-16/0100r3, MIMO BF Training Enhancements, Wang et. al., Jan 2016 IEEE 802.11-16/0316r0, Low Complexity Beamtraining for Hybrid MIMO, Fellhauer et. al., March 2016 IEEE 802.11-16/0420r1, BF Training for SU MIMO, Huang et. al., March 2016 IEEE 802.11-15/1358r5, Specification Framework for TGay, Cordeiro, August 2016 Noh, Song, Michael D. Zoltowski, and David J. Love. "MultiResolution Codebook Based Beamforming Sequence Design in Millimeter-Wave Systems." 2015 IEEE Global Communications Conference (GLOBECOM). IEEE, 2015.

Submission

Slide 11

Kome Oteri (InterDigital)