Network Simulator ns2: Difference between revisions
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Ns-2 is a discrete event simulator targeted at networking research. |
Ns-2 is a discrete event simulator targeted at networking research. |
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= 802.11 Support = |
= General 802.11 Support = |
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The existing 802.11 support in ns-2 is disapointing for a number of reasons. |
The existing 802.11 support in ns-2 is disapointing for a number of reasons. |
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* Interference is only calculated between two packets. If the original received power is high enough, the frame will not be discarded, if it's too low, the frame will be discarded. The ratio of received to interfering power is compared to CPThresh and thus it's decided, whether the frame is discarded or not. |
* Interference is only calculated between two packets. If the original received power is high enough, the frame will not be discarded, if it's too low, the frame will be discarded. The ratio of received to interfering power is compared to CPThresh and thus it's decided, whether the frame is discarded or not. |
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== Patch by Marco Fiore == |
== Patch by Marco Fiore == |
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Link: http://www.telematica.polito.it/fiore/ |
Link: http://www.telematica.polito.it/fiore/ |
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== Patch by Ilango Purushothaman == |
== Patch by Ilango Purushothaman == |
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Link: http://ee.washington.edu/research/funlab/802_11/802_11_beacon.tar.gz |
Link: http://ee.washington.edu/research/funlab/802_11/802_11_beacon.tar.gz |
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= 802.11e support = |
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Problems |
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* Incompatible with legacy scripts |
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* Does not use logging functionality of ns2 |
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* No collisions between different network links???? |
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== Patch by Mike Moreton == |
== Patch by Mike Moreton == |
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* Original download location is offline |
* Original download location is offline |
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== IEEE 802.11e EDCA Simulation Model for ns-2 == |
== IEEE 802.11e EDCA Simulation Model for ns-2 (TU Berlin) == |
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Link: http://www.tkn.tu-berlin.de/research/802.11e_ns2/ |
Link: http://www.tkn.tu-berlin.de/research/802.11e_ns2/ |
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* proper computation of NAV, |
* proper computation of NAV, |
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* proper setting / resetting of NAV. |
* proper setting / resetting of NAV. |
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Missing: |
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* Rate Adaptation |
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== Stanford's 802.11e implementation for ns/2 == |
== Stanford's 802.11e implementation for ns/2 == |
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Link: http://info.iet.unipi.it/~cng/ns2hcca/ |
Link: http://info.iet.unipi.it/~cng/ns2hcca/ |
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* Patch for ns-2.29 (Nov 2005) |
* Patch for ns-2.29 (Nov 2005) |
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Latest revision as of 07:43, 5 June 2007
Ns-2 is a discrete event simulator targeted at networking research.
General 802.11 Support
The existing 802.11 support in ns-2 is disapointing for a number of reasons.
- No beacons, management packets etc
- No support for vendor specific extensions like
- transmission power control
- dynamic channel allocation
- No cross-channel fading
- Purushothaman, Roy - Technical Report - IEEE 802.11 implementation issues/bugs in ns2
- Schmidt-Eisenlohr et al - Bug Fixes on the IEEE 802.11 DCF Module of the Network Simulator ns-2.28
Interference Model
- Interference is only calculated between two packets. If the original received power is high enough, the frame will not be discarded, if it's too low, the frame will be discarded. The ratio of received to interfering power is compared to CPThresh and thus it's decided, whether the frame is discarded or not.
Patch by Marco Fiore
Adds the following features to ns-2.29
- realistic channel propagation by Wu Xiuchao
- ricean propagation model by Ratish J. Punnoose
- SNOOPy calendar scheduler by David X. Wei
- 802.11 bug fixes by Felix Schmidt-Eisenlohr
- multiple data transmission rates support by Marco Fiore
- Adaptive Auto Rate Fallback (AARF) by Marco Fiore.
Link: http://www.telematica.polito.it/fiore/
Patch by Ilango Purushothaman
- beacon support
- ongoing work!
Link: http://ee.washington.edu/research/funlab/802_11/802_11_beacon.tar.gz
IEEE 802.11 PCF support for ns-2.1b8
Link: http://www.sm.luth.se/~dugdale/index/software.shtml/
IEEE 802.11 Power Saving Model (PSM) support for ns-2.1b8a
Link: http://www.cag.lcs.mit.edu/~ronny/wireless_psm/readme.html
- Simulates standard 802.11 PSM protocol, or the Bounded Slowdown (BSD) protocol
802.11e support
Fork by Mathieu Lacage (INRIA)
A new 802.11 module based on a fork of ns-2 around mid-september 2005. Latest release was released in September 2005. The fork is not supported anymore.
Improvements
- ET/SNRT/BER-based PHY models
- 802.11a multirate
- 802.11e HCCA and EDCA
Problems
- Incompatible with legacy scripts
- Does not use logging functionality of ns2
- No collisions between different network links????
Link: http://yans.inria.fr/ns-2-80211/
Patch by Mike Moreton
- based on ns-2.26 (feb 2003)
- Support for 802.11e
- Original download location is offline
IEEE 802.11e EDCA Simulation Model for ns-2 (TU Berlin)
Link: http://www.tkn.tu-berlin.de/research/802.11e_ns2/
Based on ns-2.28 (feb 2005)
Extensions:
- EDCA
- no HCCA
- no block ACK
- contention free bursting (CFB) / TXOP bursting
Bugfixes:
- introduces seperate SIFS timer, such that different timers for deferal (DIFS) and inter-packet times are semantically different,
- stops deferal whenever the medium becomes busy,
- proper computation of NAV,
- proper setting / resetting of NAV.
Missing:
- Rate Adaptation
Stanford's 802.11e implementation for ns/2
Link: http://mosquitonet.stanford.edu/software/802.11e/
Qiang Ni's EDCF/HCF implementations for ns/2
Link: http://www-sop.inria.fr/planete/qni/Research.html
IEEE 802.11e HCCA module for ns-2
Link: http://info.iet.unipi.it/~cng/ns2hcca/
- Patch for ns-2.29 (Nov 2005)