Download presentation

Presentation is loading. Please wait.

Published byBrandon Salazar Modified over 4 years ago

1
Mission-based Joint Optimal Resource Allocation in Wireless Multicast Sensor Networks Yun Hou Prof Kin K. Leung Archan Misra

2
Existing Congestion Control Originally, wired networks rate is the only variable to maximize network utility with fixed link capacity Recently, wireless networks Power defines capacity Power as another variable Alleviating bottlenecks More power on congested nodes Less power on non-congested nodes Conserving energy Congestion Control Via Network Utility Maximization Maximize the network utility Utility = U(flow rates) So far, Congestion Control = Joint optimization (rate, power) (Kelly, Low) (Chiang)

3
Issue with Single-radio Wireless Sensor Networks A node can transmit for one flow at a time Multiple flows going through the same node Flows are scheduled one by one Flow 1 Flow 2 Single-radio Sensor: All flows share the air-time of the node Question : how much air-time to spend on each flows?

4
Motivation – Adaptive airtime-sharing Equal time sharing = Suboptimal Biased time sharing = Optimal More then needed Less than needed Effective C = C * time fraction Objective : How to jointly adapt rate, power with airtime-sharing?

5
Multi-cast networks Two flows: [1, 2] = sources [3, 4, 5] = forwarding nodes [6, 7, 8, 9] = sinks One parent has multiple next-hop children nodes 2. Capacity for a transmission (n,f) One parent broadcast to multiple children Bottleneck child defines capacity Capacity of (3,1) = 5 1. (n,f) one multicast transmission C=5C=10 C(3,1)=5 Something special with multicast

6
s.t. where challenges: the non-linear rate constraint – explicit time fractions sharing scheme the non-concavity – High SINR Unknown bottleneck child -- known network schedule Challenges and assumptions The original problem Objective function = strictly concave : fixed time fraction for transmission (n,f) : set of flows passing through node n

7
Problem formulation: Utility of flowsPenalty of power Capacity is a function of power Capacity constraint with time sharing where Airtime Sharing: Multiple flows passing one node share the airtime of node The time fraction for flow f at n: Congestion control with adaptive air-time sharing (AAS) s.t.

8
Decomposition s.t. where The Lagrangian of the problem: RATE sub-problem: C is known constant here POWER-TIME sub-problem: C is to be optimized The RATE problem is concave by definition What about the POWER-TIME problem?

9
The capacity function C n,f (P) is concave –The Hessian matrix of C n,f < 0 The capacity function α n,f C n,f (P) is concave –Relative entropy –Preserves the convexity For any given vector V Concavity of POWER-TIME H is definite negative

10
Updating the airtime fractions Review the Lagrangian: At the optimum, we have Towards the optimal, an iterative algorithm to update is: The airtime constraint Insight: requires local info only works with existing congestion control readily Insight: More time to saturated flows Less time to low-demand flows

11
Adaptive air-time sharing (AAS) with optimal rate and power allocation The joint rate and power allocation algorithm (JRPA ) Airtime allocation based on local info. (rate and capacity) only Distributed AAS generally work with most kind of rate and power control.

12
Numerical results -Multicast scenarios AAS works with multicast as well The joint congestion control converges AAS improves network utility Optimal time-allocation at nodes can improve flow rates while saving power

13
Formulated a joint rate, power and per-node airtime optimization problem for multicast wireless networks Showed the concavity and convergence Fully distributed AAS working with existing congestion control algorithms Optimal airtime sharing improves the congestion control algorithms Future work Adaptive network schedule Optimal rate and power allocation with sensor selection Conclusions and future work

Similar presentations

OK

Optimization Flow Control—I: Basic Algorithm and Convergence Present : Li-der.

Optimization Flow Control—I: Basic Algorithm and Convergence Present : Li-der.

© 2018 SlidePlayer.com Inc.

All rights reserved.

To make this website work, we log user data and share it with processors. To use this website, you must agree to our Privacy Policy, including cookie policy.

Ads by Google

Ppt on tcp/ip protocol stack Ppt on guru granth sahib pdf Ppt on inhabiting other planets in the milky Ppt on shell scripting youtube Ppt on internet banking free download The nervous system for kids ppt on batteries Ppt on history of badminton game Animated ppt on magnetism for kids Cdc ppt on zika Ppt on computer graphics notes