Layer 3 Throughput Analysis for Advanced ALOHA Protocols Federico - - PowerPoint PPT Presentation

layer 3 throughput analysis for advanced aloha protocols
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Layer 3 Throughput Analysis for Advanced ALOHA Protocols Federico - - PowerPoint PPT Presentation

Jan. 2015 SPCoding School, Campinas, Brazil Layer 3 Throughput Analysis for Advanced ALOHA Protocols Federico Clazzer 1 1 Institute for Communications and Navigation German Aerospace Center, DLR, Germany 1/5 SPCoding School 2015 F. Clazzer


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SLIDE 1
  • Jan. 2015

SPCoding School, Campinas, Brazil

Layer 3 Throughput Analysis for Advanced ALOHA Protocols

Federico Clazzer1

1 Institute for Communications and Navigation

German Aerospace Center, DLR, Germany

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SLIDE 2

1/5 SPCoding School 2015 − F. Clazzer − Layer 3 Throughput Analysis for Advanced ALOHA Protocols −

  • Jan. 2015

Background

Medium access protocols are fundamental for an effective and efficient share

  • f the common medium in wireless scenarios with multiple transmitters.

Random access schemes are simple and effective when the nature of the channel traffic generated by the transmitters shows a bursty and unpredictable nature or when the number of transmitters is extremely high and coordination is hard to achieve. Example scenarios are

  • Machine-to-machine communication
  • Satellite networks
  • Underwater networks
  • RFID communication systems
  • Vehicular and ad-hoc networks
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SLIDE 3

2/5 SPCoding School 2015 − F. Clazzer − Layer 3 Throughput Analysis for Advanced ALOHA Protocols −

  • Jan. 2015

Motivation

  • Nowadays Random Access (RA) is used for signaling or for session

initialization, but

  • New RA protocols have a very good throughput performance (see next

slide), therefore

  • They might be used also for data transmission and
  • Extended performance evaluations of RA protocols in a complete

protocol stack are still missing

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SLIDE 4

3/5 SPCoding School 2015 − F. Clazzer − Layer 3 Throughput Analysis for Advanced ALOHA Protocols −

  • Jan. 2015

Layer 3 Throughput Analysis

The assumptions

  • We consider a population of Nu users sharing the same medium where

each user generates packets of layer 3 with a duration subject to the generic probability measure fX(x)

  • The user cannot forward the layer 3 packet to layer 2 until the previous

layer 2 packet has been sent.

  • The protocols operation are assumed in open-loop
  • Both slotted (SA, CRDSA) and unslotted (ALOHA, CRA) are considered

in the investigation

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SLIDE 5

4/5 SPCoding School 2015 − F. Clazzer − Layer 3 Throughput Analysis for Advanced ALOHA Protocols −

  • Jan. 2015

Remarks

  • The analytical framework helps to evaluate the layer 3 throughput of

slotted schemes without the need of numerical simulation of this layer.

  • The required input are only

1 Successful decoding probability of layer 2, Psucc−L2 2 The probability measure fX (x) or at least the estimate of the mean value

Conclusions

  • Numerical results will show that unslotted protocols outperforms slotted
  • nes in all the scenarios
  • Slotted protocols instead are more robust against variations in the

probability measure of the L3 packet length