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Add a cell_density option to configure data rates for normal, high and very high cell density wireless deployments. The purpose of using a minimum basic/mandatory data rate that is higher than 6 Mb/s, or 5.5 Mb/s (802.11b compatible), in high cell density environments is to transmit broadcast/multicast data frames using less airtime or to reduce management overheads where significant co-channel interference (CCI) exists and cannot be avoided. Caution: Without careful design and validation, configuration of a too high minimum basic/mandatory data rate can sacrifice connection stability or disrupt the ability to reliably connect and authenticate for little to no capacity benefit. This is because this configuration affects the ability of clients to hear and demodulate management, control and broadcast/multicast data frames. Deployments that have not been specifically designed and validated are usually best suited to use 6, 12 and 24 Mb/s as basic/mandatory data rates. Only usually seek to configure a 12 Mb/s, or 11 Mb/s (802.11b compatible), minimum basic/mandatory rate in high cell density deployments that have been designed and validated for this. For many deployments, the minimum basic/mandatory data rate should not be configured above 12 Mb/s to 18 Mb/s, 24 Mb/s or higher. Such a configuration is only appropriate for use in very high cell density deployment scenarios. A cell_density of Very High (3) should only be used where a deployment has a valid use case and has been designed and validated specifically for this use, nearly always with highly directional antennas - an example would be stadium deployments. For example, with a 24 Mb/s OFDM minimum basic/mandatory data rate, approximately a -73 dBm RSSI is required to decode frames. Many clients will not have roamed elsewhere by the time that they experience -73 dBm and, where they do, they frequently may not hear and be able to demodulate beacon, control or broadcast/multicast data frames causing connectivity issues. There is a myth that disabling lower basic/mandatory data rates will improve roaming and avoid sticky clients. For 802.11n, 802.11ac and 802.11ax clients this is not correct as clients will shift to and use lower MCS rates and not to the 802.11b or 802.11g/802.11a rates that are able to be used as basic/mandatory data rates. There is a myth that disabling lower basic/mandatory data rates will ensure that clients only use higher data rates and that better performance is assured. For 802.11n, 802.11ac and 802.11ax clients this is not correct as clients will shift around and use MCS rates and not the 802.11b or 802.11g/802.11a rates that able to be used as basic/mandatory data rates. Cell Density 0 - Disabled (Default) Setting cell_density to 0 does not configure data rates. This is the default. 1 - Normal Cell Density Setting cell_density to 1 configures the basic/mandatory rates to 6, 12 and 24 Mb/s OFDM rates where legacy_rates is 0. Supported rates lower than the minimum basic/mandatory rate are not offered. Setting cell_density to 1 configures the basic/mandatory rates to the 5.5 and 11 Mb/s DSSS rates where legacy_rates is 1. Supported rates lower than the minimum basic/mandatory rate are not offered. 2 - High Cell Density Setting the cell_density to 2 configures the basic/mandatory rates to the 12 and 24 Mb/s OFDM rates where legacy_rates is 0. Supported rates lower than the minimum basic/mandatory rate are not offered. Setting the cell_density to 2 configures the basic/mandatory rates to the 11 Mb/s DSSS rate where legacy_rates is 1. Supported rates lower than the minimum basic/mandatory rate are not offered. 3 - Very High Cell Density Setting the cell_density to 3 configures the basic/mandatory rates to the 24 Mb/s OFDM rate where legacy_rates is 0. Supported rates lower than the minimum basic/mandatory rate are not offered. Setting the cell_density to 3 only has effect where legacy_rates is 0, else this has the same effect as being configured with a cell_density of 2. Where specified, the basic_rate and supported_rates options continue to override both the cell_density and legacy_rates options. Signed-off-by: Nick Lowe <nick.lowe@gmail.com> |
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OpenWrt Project is a Linux operating system targeting embedded devices. Instead of trying to create a single, static firmware, OpenWrt provides a fully writable filesystem with package management. This frees you from the application selection and configuration provided by the vendor and allows you to customize the device through the use of packages to suit any application. For developers, OpenWrt is the framework to build an application without having to build a complete firmware around it; for users this means the ability for full customization, to use the device in ways never envisioned.
Sunshine!
Development
To build your own firmware you need a GNU/Linux, BSD or MacOSX system (case sensitive filesystem required). Cygwin is unsupported because of the lack of a case sensitive file system.
Requirements
You need the following tools to compile OpenWrt, the package names vary between distributions. A complete list with distribution specific packages is found in the Build System Setup documentation.
gcc binutils bzip2 flex python3 perl make find grep diff unzip gawk getopt
subversion libz-dev libc-dev
Quickstart
-
Run
./scripts/feeds update -ato obtain all the latest package definitions defined in feeds.conf / feeds.conf.default -
Run
./scripts/feeds install -ato install symlinks for all obtained packages into package/feeds/ -
Run
make menuconfigto select your preferred configuration for the toolchain, target system & firmware packages. -
Run
maketo build your firmware. This will download all sources, build the cross-compile toolchain and then cross-compile the GNU/Linux kernel & all chosen applications for your target system.
Related Repositories
The main repository uses multiple sub-repositories to manage packages of
different categories. All packages are installed via the OpenWrt package
manager called opkg. If you're looking to develop the web interface or port
packages to OpenWrt, please find the fitting repository below.
-
LuCI Web Interface: Modern and modular interface to control the device via a web browser.
-
OpenWrt Packages: Community repository of ported packages.
-
OpenWrt Routing: Packages specifically focused on (mesh) routing.
Support Information
For a list of supported devices see the OpenWrt Hardware Database
Documentation
Support Community
- Forum: For usage, projects, discussions and hardware advise.
- Support Chat: Channel
#openwrton freenode.net.
Developer Community
- Bug Reports: Report bugs in OpenWrt
- Dev Mailing List: Send patches
- Dev Chat: Channel
#openwrt-develon freenode.net.
License
OpenWrt is licensed under GPL-2.0