Difference between revisions of "LAA-WiFi-Coexistence"
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ns-3 is well-known for providing high fidelity, packet-level models of [https://www.nsnam.org/docs//models/html/wifi.html Wi-Fi] and [https://www.nsnam.org/docs//models/html/lte.html LTE], but simulation studies to date have not tried to combine the technologies on the same channel. In industry, 3GPP is defining standards for [http://www.3gpp.org/news-events/3gpp-news/1603-lte_in_unlicensed using LTE in unlicensed spectrum]. The term License-Assisted Access (LAA) is frequently used to refer to these extensions, and refers to the fact that the use of unlicensed spectrum is complementary to the use of licensed spectrum for LTE, with the unlicensed spectrum providing complementary or secondary carriers that can be aggregated with carriers on licensed frequencies. | ns-3 is well-known for providing high fidelity, packet-level models of [https://www.nsnam.org/docs//models/html/wifi.html Wi-Fi] and [https://www.nsnam.org/docs//models/html/lte.html LTE], but simulation studies to date have not tried to combine the technologies on the same channel. In industry, 3GPP is defining standards for [http://www.3gpp.org/news-events/3gpp-news/1603-lte_in_unlicensed using LTE in unlicensed spectrum]. The term License-Assisted Access (LAA) is frequently used to refer to these extensions, and refers to the fact that the use of unlicensed spectrum is complementary to the use of licensed spectrum for LTE, with the unlicensed spectrum providing complementary or secondary carriers that can be aggregated with carriers on licensed frequencies. | ||
| − | This page describes a project sponsored by | + | This page describes a project sponsored by [http://www.wi-fi.org/ Wi-Fi Alliance] to improve ns-3 models to facilitate studies about the coexistence of Wi-Fi and unlicensed variants of LTE on the same channel. The project is being conducted by [http://www.cttc.es/ CTTC] and the [https://depts.washington.edu/funlab/members/ University of Washington]. |
== Design == | == Design == | ||
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The software is available in a repository at ns-3's main code server, http://code.nsnam.org: | The software is available in a repository at ns-3's main code server, http://code.nsnam.org: | ||
* The phase 1 code is available with Mercurial, can be [http://code.nsnam.org/laa/ns-3-laa/ browsed on the web], or by download in a [http://code.nsnam.org/laa/ns-3-laa/archive/tip.zip zip] or [http://code.nsnam.org/laa/ns-3-laa/archive/tip.tar.bz2 tar.bz2] format. | * The phase 1 code is available with Mercurial, can be [http://code.nsnam.org/laa/ns-3-laa/ browsed on the web], or by download in a [http://code.nsnam.org/laa/ns-3-laa/archive/tip.zip zip] or [http://code.nsnam.org/laa/ns-3-laa/archive/tip.tar.bz2 tar.bz2] format. | ||
| − | * The phase 2 code (under | + | * The phase 2 code (still under development as of this February 2016 writing) is available with Mercurial, can be [http://code.nsnam.org/laa/ns-3-lbt/ browsed on the web], or by download in a [http://code.nsnam.org/laa/ns-3-lbt/archive/tip.zip zip] or [http://code.nsnam.org/laa/ns-3-lbt/archive/tip.tar.bz2 tar.bz2] format. |
The software will eventually be migrated to ns-3 releases, but as of the latest ns-3.24 release, none of the above extensions are available in the main release. | The software will eventually be migrated to ns-3 releases, but as of the latest ns-3.24 release, none of the above extensions are available in the main release. | ||
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A contribution to the November 3GPP RAN1 meeting ([http://www.3gpp.org/ftp/tsg_ran/WG1_RL1/TSGR1_83/Docs/R1-156621.zip R1-156621]) has been generated. Steps to reproduce the experiments in the contribution are documented in the file 'src/laa-wifi-coexistence/experiments/README.txt' in the phase 2 repository. | A contribution to the November 3GPP RAN1 meeting ([http://www.3gpp.org/ftp/tsg_ran/WG1_RL1/TSGR1_83/Docs/R1-156621.zip R1-156621]) has been generated. Steps to reproduce the experiments in the contribution are documented in the file 'src/laa-wifi-coexistence/experiments/README.txt' in the phase 2 repository. | ||
| − | + | The implementation has evolved since the November 3GPP RAN1 meeting and more current results are documented in the links below. | |
== Getting started == | == Getting started == | ||
Revision as of 05:49, 16 February 2016
Main Page - Current Development - Developer FAQ - Tools - Related Projects - Project Ideas - Summer Projects
Installation - Troubleshooting - User FAQ - HOWTOs - Samples - Models - Education - Contributed Code - Papers
Contents
Overview
ns-3 is well-known for providing high fidelity, packet-level models of Wi-Fi and LTE, but simulation studies to date have not tried to combine the technologies on the same channel. In industry, 3GPP is defining standards for using LTE in unlicensed spectrum. The term License-Assisted Access (LAA) is frequently used to refer to these extensions, and refers to the fact that the use of unlicensed spectrum is complementary to the use of licensed spectrum for LTE, with the unlicensed spectrum providing complementary or secondary carriers that can be aggregated with carriers on licensed frequencies.
This page describes a project sponsored by Wi-Fi Alliance to improve ns-3 models to facilitate studies about the coexistence of Wi-Fi and unlicensed variants of LTE on the same channel. The project is being conducted by CTTC and the University of Washington.
Design
Phase 1
This phase has produced a new Wi-Fi Spectrum-based physical layer, enabling Wi-Fi devices and LTE devices to coexist on the same ns-3 channel. Beyond this enabling capability, several enhancements to the ns-3 models have been made:
- Enhancements to Wi-Fi clear-channel access (CCA) and frame synchronization models
- A Wi-Fi roaming model for AP selection based on received signal strength
- LTE interference model enhancements
- New indoor and outdoor propagation models
- Wi-Fi MIMO and interference models for fading model D
- Duty-cycled LTE transmission model
- Scenarios corresponding to the indoor and outdoor scenarios defined in 3GPP TR36.889
- A framework for executing simulation campaigns and quickly plotting the results
Phase 2
Current work is focused on developing models related to the current standardization process for Release 13. In particular, a "Listen-Before-Talk" (LBT) mode is being developed for LTE, and scenarios are being constructed to evaluate technical topics such as the sensitivity on performance on the Energy Detection threshold used for the LBT CCA mechanism.
Software
The software is available in a repository at ns-3's main code server, http://code.nsnam.org:
- The phase 1 code is available with Mercurial, can be browsed on the web, or by download in a zip or tar.bz2 format.
- The phase 2 code (still under development as of this February 2016 writing) is available with Mercurial, can be browsed on the web, or by download in a zip or tar.bz2 format.
The software will eventually be migrated to ns-3 releases, but as of the latest ns-3.24 release, none of the above extensions are available in the main release.
The extensions reside in four main directories:
- Scripts, tests, and documentation to construct simulations involving these new models are in 'src/laa-wifi-coexistence'
- Extensions to LTE to enable unlicensed variants are in 'src/lte'
- Extensions to the Wi-Fi module to enable the SpectrumWifiPhy and new error models are in 'src/wifi'
- Propagation model extensions are in 'src/propagation'
Reports
A contribution to the November 3GPP RAN1 meeting (R1-156621) has been generated. Steps to reproduce the experiments in the contribution are documented in the file 'src/laa-wifi-coexistence/experiments/README.txt' in the phase 2 repository.
The implementation has evolved since the November 3GPP RAN1 meeting and more current results are documented in the links below.
Getting started
All figures and data in the 3GPP RAN1 meeting contribution can be generated by following the steps in the above ns-3-lbt Phase 2 archive by consulting the README.txt in the software directory under 'src/laa-wifi-coexistence/experiments/README.txt'.
Additional documentation (in progress) is available at the following URLs:
- HTML: https://www.nsnam.org/~tomh/ns-3-lbt-documents/html/lbt-wifi-coexistence.html
- PDF: https://www.nsnam.org/~tomh/ns-3-lbt-documents/lbt-wifi-coexistence.pdf
Contacts
Contact Tom Henderson (tomhend@u.washington.edu) for more information.
