Peering in Infrastructure Ad hoc Networks
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- David Christensen
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1 Peering in Infrastructure Ad hoc Networks EE 228a Course Project Mentor : Linhai He Group : Matulya Bansal Sanjeev Kohli
2 Presentation Outline Introduction to the problem Objectives Problem Formulation Analysis of approaches Experimental Results Conclusions
3 Presentation Outline Introduction to the problem Objectives Problem Formulation Analysis of approaches Experimental Results Conclusions
4 Ad hoc Networks : Current Modes of Operation Peer-to-Peer Mode Nodes relay each other s traffic Infrastructure Mode No relaying between nodes Nodes directly communicate with Base Station
5 A Hybrid Approach Base station A B Does Peering in Infrastructure Mode make sense?
6 Scenario : Reduced Power Base Station A B A and B both want to communicate with the base station. Using direct connections, A ends up using more power. With B agreeing to peer, A can reduce its power consumption while B can increase its throughput.
7 Presentation Outline Introduction to the problem Objectives Problem Formulation Analysis of approaches Experimental Results Conclusions
8 Objectives Analyze the advantages of peering in infrastructure mode based on two approaches: Individual User Centric: Each user tries to maximize its own performance System Centric: Users collaborate to maximize overall system performance Show improvement in network performance with experimental results
9 Assumptions Base Station distributes tokens to each user in every cycle The number of tokens, T, distributed by BS in every cycle equals the no of transmission slots in each cycle A user can transmit in a slot only if it has a token Underline MAC layer resolves contention for slots
10 Presentation Outline Introduction to the problem Objectives Problem Formulation Analysis of approaches Experimental Results Conclusions
11 Problem Formulation BS A B Total tokens in system - T Node A has T A tokens Node B has T B tokens T A + T B = T Power level of transmission is same for each user, P T
12 Problem Formulation (contd.) BS A B Data rate/slot for A BS = r A 1/(d A ) α Data rate/slot for B BS = r B 1/(d B ) α Data rate/slot for A B = r AB 1/(d AB ) α
13 No Peering (Relaying) BS A B Throughput of node A = T A.r A Throughput of node B = T B.r B Throughput of the whole system = τ = T A.r A + T B.r B Power consumption for above throughput = (T A + T B )P T
14 Node B Relays Node A s traffic Node A sends a request to node B for relaying its data. Information of total data to be relayed is sent with this the request Node B analyzes the cost of relaying (in terms of power spent and throughput gained) and sends a response to node A asking for the no of tokens it wants in lieu of relaying Node A analyzes this response and decides to relay its traffic through node B if it can meet node B s demand Assumption: Protocol setup time is negligible
15 Node B relays Node A s traffic BS A Request B Response Data
16 Problem formulation (contd.) Throughput of node A = T AB.r AB =T A.r A No of tokens available for distribution = T A T AB where T AB = T A (d AB /d A ) α Throughput of node B = (T B +T B ).r B where T B is the minimum no of tokens gained by node B to justify the relay i.e. to satisfy its utility function
17 Problem formulation (contd.) No of tokens saved in the system = T A (T AB + T B + T B ) where T B is the no of tokens needed by node B to transmit node A s data i.e. T B = (T AB.r AB )/r B Power spent by the system for same throughput as in the case of no relay = (T AB + T B + T B )P T
18 Token Distribution Strategies Equal tokens Both nodes get half of the total tokens T A = T B = T/2 [ Not Fair ] Equal Bandwidth Both nodes get equal throughput T A.r A = T B.r B T A /T B =(d A /d B ) α [ Doesn t optimize overall system throughput ]
19 Token Distribution Strategies Equal normalized rate of change in throughput w.r.t. no of tokens Throughput of node A = T A.r A T A /(d A ) α d(t A.r A )/d(t A ) 1/(d A ) α Similarly, d(t B.r B )/d(t B ) 1/(d B ) α [d(t A.r A )/d(t A )]/T A = [d(t B.r B )/d(t B )]/T B T A /T B =(d B /d A ) α BS [Optimizes overall system throughput and seems fair] A B
20 Presentation Outline Introduction to the problem Objectives Problem Formulation Analysis of approaches Experimental Results Conclusions
21 User Centric Approach In this system, each user tries to improve its own performance i.e. it doesn t relay any data for social cause, it relays only to improve its own performance We define the utility function of relaying node as: U(T, P) = T[1 + C(log P)/P] where T and P are the no of tokens and battery power of relaying node (available for itself) respectively Captures the token gain and energy payoff of relaying node very well
22 User Centric Approach (contd.) Value of utility function of node B before relaying is: U(T B, P B ) = T B [1 + C(log P B )/P B ] If T B is the no of tokens gained by relaying the data and P B is its new residual power, then new value of node B s utility function is: U((T B +T B ), P B ) = (T B + T B )[1 + C(log P B )/P B ] where P B = P B (P T.T B )and T B = T AB.r AB /r B
23 User Centric Approach (contd.) Since relaying node wants to maximize its performance, its utility value shouldn t decrease after relaying the date i.e. : U((T B +T B ), P B ) - U(T B, P B ) > 0 T B > T B C [(log P B /P B )/ P B ] T B C [(log P B /P B )/ P B ] is the minimum no of tokens needed by node B for its own usage in order to justify relaying node A s data.
24 System Centric Approach The users in this system try to enhance the overall system performance rather than their own. A user relays the traffic from another node if the ratio of residual battery power of relay node and source node is greater than the ratio of energy spent per bit by the relay node and the source node for transmission i.e. : PRelay ERelay > P E Direct Direct where E Direct and E Relay are the energies spent by source node and relay node to transmit one bit to the Base Station
25 System Centric Approach (contd.) In our 2-node case, E E B A d = ( d B α ) A A B BS Hence, node B will relay node A s data if, P P B A d > ( d B α ) A
26 Presentation Outline Introduction to the problem Objectives Problem Formulation Analysis of approaches Experimental Results Conclusions
27 Experimental Results Approach 1: Varying position of node B, power of B fixed
28 Experimental Results Approach 1: Varying position of node B, power at B fixed
29 Experimental Results Approach 1: Varying position of node A, power at B fixed
30 Experimental Results Approach 1: Varying position of node A, power at B fixed
31 Experimental Results Fraction of slots saved Vs power at node B Approach 1: Varying Power at node B, positions of A & B fixed
32 Experimental Results Approach 1: Varying Power at node B, positions of A & B fixed
33 Experimental Results Approach 2: Varying position of node B, power at A & B fixed
34 Experimental Results Approach 2: Varying position of node A, power at A & B fixed
35 Experimental Results Approach 2: Varying Power at node B, positions of A & B and power at A fixed
36 Presentation Outline Introduction to the problem Objectives Problem Formulation Analysis of approaches Experimental Results Conclusions
37 Conclusions Relaying can reduce power consumption in the system, increase throughput of the system or do both The amount of improvement achieved depends on the token distribution strategy and the topology of the system and battery power of constituents
38 Future Work Extend the analysis and experiments for N nodes Fine tune the model Analyze the system with different fairness notions
39 References 1. P. Gupta and P.R. Kumar, The capacity of Wireless Networks, IEEE Transactions on Information Theory, November M. Kubisch, S. Mengesha, D. Hollos, H. Karl and A. Wolisz, Applying ad-hoc relaying to improve capacity, energy efficiency and immission in infrastructure-based WLANs, TKN Technical Report Series, Berlin, July H. Karl and S. Mengesha, Analysing Capacity Improvements in Wireless Networks by Relaying, TKN Technical Report Series, Berlin, May M. Agarwal and A. Puri, Basestation Scheduling of Requests with Fixed Deadlines, INFOCOM'2002.
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