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B1 = 15 B2 = 5 data Distributed Fair Scheduling (DFS) wait Weight of node 1 = 1 Weight of node 2 = 3 Assume equal packet size B1 = 10 B2 = 5 wait data B1 = 5 B2 = 5 Collision ! B1 = 15 (DFS actually picks a random value with mean 15) B2 = 5 (DFS picks a value with mean 5) 286
Impact of Collisions After collision resolution, either node 1 or node 2 may transmit a packet The two alternatives may have different fairness properties (since collision resolution can result in priority inversion) 287
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- Page 253 and 254: Other Geocasting Schemes [Macwan01
- Page 255 and 256: Some Related Work Content-based Mu
- Page 257 and 258: Capacity of Fixed Ad Hoc Networks [
- Page 259 and 260: Continues from last slide … Dela
- Page 261 and 262: Measured Scaling Law [Gupta01] Mea
- Page 263 and 264: Medium Access Control Protocols 263
- Page 265 and 266: Hidden Terminal Problem Node B can
- Page 267 and 268: Reliability Wireless links are pro
- Page 269 and 270: IEEE 802.11 Wireless MAC Distribut
- Page 271 and 272: Collision Avoidance With half-dupl
- Page 273 and 274: B1 = 25 B2 = 20 cw = 31 DCF Example
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- Page 277 and 278: Binary Exponential Backoff in DCF
- Page 279 and 280: IEEE 802.11 Distributed Coordinatio
- Page 281 and 282: Fairness Issue Assume that initial
- Page 283 and 284: MACAW Solution for Fairness When a
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- Page 291 and 292: Fairness in Multi-Hop Networks Not
- Page 293 and 294: Balanced MAC degree of node j p_ij
- Page 295 and 296: Balanced MAC Results show that it
- Page 297 and 298: Estimation-Based Fair MAC Fair sha
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- Page 301 and 302: Sender-Initiated Protocols The pro
- Page 303 and 304: Using Receiver’s Help in a Sender
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- Page 307 and 308: Capacity and MAC Protocols The MAC
- Page 309 and 310: Energy Conserving MAC Since many m
- Page 311 and 312: A Power Aware Multi-Access Protocol
- Page 313 and 314: PAMAS PAMAS uses a control channel
- Page 315 and 316: Another Proposal in PAMAS To avoid
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- Page 319 and 320: UDP Performance Several relevant s
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- Page 325 and 326: Transmission Control Protocol (TCP)
- Page 327 and 328: Cumulative Acknowledgements A new
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- Page 333 and 334: How does TCP detect a packet loss?
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B1 = 15<br />
B2 = 5<br />
data<br />
Distributed Fair Scheduling (DFS)<br />
wait<br />
Weight of node 1 = 1<br />
Weight of node 2 = 3<br />
Assume equal<br />
packet size<br />
B1 = 10<br />
B2 = 5<br />
wait<br />
data<br />
B1 = 5<br />
B2 = 5<br />
Collision !<br />
B1 = 15 (DFS actually picks a random value<br />
with mean 15)<br />
B2 = 5 (DFS picks a value with mean 5)<br />
286
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