mobility resilience and overhead constrained adaptation in … · mobility resilience and overhead...

Mobility Resilience and Overhead Constrained Adaptation in Mobile 60 GHz Networks M. Kumail Haider and Edward W. Knightly [email protected], [email protected] ECE Department, Rice University, Houston, TX RICE • 60 GHz Communication • 7-14 GHz bandwidth • Multi-Gbps rates in 802.11ad • Beamforming Training to establish directional links Introduction and Motivation • Mobility induced link breakage • Sector Misalignment • Blockage • Problems • Need training to restore the link • Exhaustive search incurs high overhead • Repeated training to overcome intermittent link breakage Training overhead to restore mobility induced link breakages can decrease throughput despite higher rates MOCA: Mobility resilience and Overhead Constrained Adaptation Beam Sounding • Sounding frames on selected sectors prior to Tx • Rate selection and beam refinement • Link breakage inference Pre-emptive Fast Recovery • Sound fail-over sectors upon breakage identification • Sector Expansion • Proactive search for NLOS paths • Switch to fail-over sectors if successful • Avoid packet loss and training overhead Beamwidth Adaptation • Jointly adapting rate and beamwidth in response to mobility • Maximize average link throughput rather than data rate • Exploiting multi-level codebook design =arg max η 1 , Implementation and Evaluation • 60 GHz Testbed • VubIQ transceivers • WARP baseband • Channel Measurements • Lab, office and classroom environments • Misalignment and rotation • Results • Slightly higher overhead in MOCA under low mobility • Significantly low overhead under high mobility due to lower training frequency • 1.5x-2x gains in throughput due to fast recovery and beamwidth adatptation approaches. Acknowledgements This research was supported by Intel, the Keck Foundation, and by NSF grants CNS-1514285 and CNS-1444056. Publication: M. Haider and E. Knightly, “Mobility Resilience and Overhead Constrained Adaptation in Directional 60 GHz WLANs: Protocol Design and System Implementation,” in Proceedings of ACM MobiHoc 2016.

Upload: others

Post on 06-Jan-2020

5 views

Category:

Documents

0 download

Report

Download

Embed Size (px):

TRANSCRIPT

Page 1: Mobility Resilience and Overhead Constrained Adaptation in … · Mobility Resilience and Overhead Constrained Adaptation in Mobile 60 GHz Networks. M. Kumail Haider and Edward W

Mobility Resilience and Overhead Constrained Adaptationin Mobile 60 GHz Networks

M. Kumail Haider and Edward W. [email protected], [email protected]

ECE Department, Rice University, Houston, TX

RICE

• 60 GHz Communication• 7-14 GHz bandwidth• Multi-Gbps rates in 802.11ad• Beamforming Training to

establish directional links

Introduction and Motivation

• Mobility induced link breakage• Sector Misalignment

• Blockage

• Problems• Need training to restore the link• Exhaustive search incurs high overhead• Repeated training to overcome intermittent link breakage

Training overhead to restore mobility induced link breakages

can decrease throughput despite higher rates

MOCA: Mobility resilience and Overhead Constrained Adaptation

Beam Sounding

• Sounding frames on selected sectors prior to Tx• Rate selection and beam refinement• Link breakage inference

Pre-emptive Fast Recovery

• Sound fail-over sectors upon breakage identification• Sector Expansion• Proactive search for NLOS paths

• Switch to fail-over sectors if successful• Avoid packet loss and training overhead

Beamwidth Adaptation

• Jointly adapting rate and beamwidth in response to mobility• Maximize average link throughput rather than data rate• Exploiting multi-level codebook design

𝜃𝜃𝑀𝑀𝑀𝑀𝑀𝑀𝑀𝑀 =arg max η 𝜃𝜃𝜃𝜃𝜃𝜃 𝜃𝜃1,𝜃𝜃𝑛𝑛

Implementation and Evaluation• 60 GHz Testbed

• VubIQ transceivers• WARP baseband

• Channel Measurements• Lab, office and classroom

environments• Misalignment and rotation

• Results• Slightly higher overhead in MOCA

under low mobility• Significantly low overhead under

high mobility due to lower training frequency

• 1.5x-2x gains in throughput due to fast recovery and beamwidthadatptation approaches.

Acknowledgements This research was supported by Intel, the Keck Foundation, and by NSF grants CNS-1514285 and CNS-1444056.

Publication: M. Haider and E. Knightly, “Mobility Resilience and Overhead Constrained Adaptation in Directional 60 GHz WLANs: Protocol Design and System Implementation,” in Proceedings of ACM MobiHoc 2016.

Simultaneous Scene Reconstruction and Auto-calibration ... · Auto-calibration using Constrained Iterative Closest ... captured from two overhead Microsoft Kinect cameras were

SnapApp: Mitigating Authentication Overhead with a Time ...€¦ · devices that reduces authentication overhead with a time-constrained quick-access option. SnapApp provides two

Using Overhead Projectors (OHPs) and Overhead Transparencies (OHTs)

Constrained Waves

Secure Single-Server Aggregation with (Poly)Logarithmic Overhead · 2020. 11. 10. · server and a large number of clients with constrained resources, a single communication channel

Constrained Optimal

Constrained Delaunay Triangulations (CDT)folk.uio.no/inftt/Div/constrSlides.pdf · Constrained Delaunay Triangulations (CDT) Recall: “Definition 1” (Constrained triangulation)

Persona Constrained Posterior Stabilized (CPS) Surgical · PDF fileINTR Constrained Posterior Stabilized (CPS) Surgical Technique Introduction The Constrained Posterior Stabilized

Multivariate Analysis - II: Constrained Ordinationcc.oulu.fi/~jarioksa/opetus/metodi/mmmbeam2.pdf · Constrained Ordination Methods Constrained Ordination 1 Distance-based Redundancy

Cable Pullers - Used Cranes | Overhead Cranes | Overhead

1 PREDETERMINED OVERHEAD RATE, OVERHEAD APPLICATION

ATTACHMENT 6.2 CORPORATE OVERHEAD STRATEGY · > Corporate Overhead Strategy > Divisional Overhead Strategy > System Operational Expenditure Strategy 2. Corporate overhead overview