Channel Access Delay Analysis of IEEE 802-16 Best Effort Services Hossein Ghaffarian, Mahmood Fathy, Mohsen Soryani Dept. of Computer Engineering Iran.

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Channel Access Delay Analysis of IEEE Best Effort Services Hossein Ghaffarian, Mahmood Fathy, Mohsen Soryani Dept. of Computer Engineering Iran University of Science and Technology, Tehran-Iran IEEE Infocom 2008

Outline Introduction IEEE Best Effort Service Mechanism Analytical Model of Best Effort Service Simulation Results Conclusions 2

Introduction Four types of service Unsolicited Grant Service (UGS) Real-time Polling Service (rtPS) Non-real-time Polling Service (nrtPS) Best Effort service (BE) 3

Introduction -Motivation Implementations of four types in IEEE networks are very costly Wibro only supports Best Efforts services Related work Performance analysis via simulations results IEEE PMP mode IEEE Mesh mode IEEE

Introduction -Goal Channel access delay of IEEE BE services Analytical model for delay in BE service 5

IEEE Best Effort Service Mechanism Two types of request mechanism Stand alone bandwidth request mechanism Incremental request Aggregate request Piggybacking bandwidth request mechanism Incremental request 6

IEEE Best Effort Service Mechanism Bandwidth contention period 7 Ranging Request Opportunities Bandwidth Request Opportunities Uplink Data Bandwidth Request Opportunity 01 Bandwidth Request Opportunity N …….. Uplink Subframe

IEEE Best Effort Service Mechanism Collision avoidance Contention resolution process Request backoff start vs. Request backoff start The SS shall randomly select a value from (0, 2 Requestbackstart ) The number of contention transmission opportunities that the SS shall defer before an eligible transmission 8 Ex: Request backoff start = 4  The range of backoff = (0,15) Value = 2  Differ 2 transmission opportunities BR Opportunity 1 BR Opportunity 2 BR Opportunity 3 BR Opportunity N ……..

Analytical Model of Best Effort Service -Basic Measurements 9 Current value of backoff window of node i Backoff stage  Retry count The minimum value of backoff window of node i Retry limit

Analytical Model of Best Effort Service -Basic Measurements The probability of TXOP 1 selected by one SS is 1/5 C i : The number of connections in node i P s,i :The probability of a successful request in node i 10 BR TXOP 1 BR TXOP 2 BR TXOP 3 BR TXOP 4 BR TXOP 5

Analytical Model of Best Effort Service -Basic Measurements 11

Analytical Model of Best Effort Service -Transmission Saturation Delay 12 Backoff stage  Retry count Failure Conditions Successful Condition

Analytical Model of Best Effort Service -Transmission Saturation Delay 13

Analytical Model of Best Effort Service -Transmission Saturation Delay 14

Analytical Model of Best Effort Service -Transmission Saturation Delay 15

Analytical Model of Best Effort Service -Transmission Saturation Delay

17

Analytical Model of Best Effort Service -Transmission Saturation Delay 18

Simulation Results 19

Simulation Results 20

Simulation Results 21

Simulation Results 22

Simulation Results 23

Simulation Results 24

Simulation Results 25

Simulation Results 26

Simulation Results 27

Conclusions This paper proposes an a nalytical model for delay in BE service Transmission Markov model Analytical results The best condition: BW min = FrameOpp 28