No description
a2c1bebd43
Currently, wpa_supplicant may roam too aggressively; the need_to_roam() function will return early with a roaming decision if the difference in signal level or throughput between the current and selected APs is "sufficiently large." In particular, if the selected AP's estimated throughput is more than 5k greater than the current AP's estimated throughput, wpa_supplicant will decide to roam. Otherwise, if the selected AP's signal level is less than the current AP's signal level, or the selected AP's estimated throughput is at least 5k less than the current AP's estimated throughput, wpa_supplicant will skip the roam. These decisions are based only on one factor and can lead to poor roaming choices (e.g., a roam should not happen if the selected AP's estimated throughput meets the threshold but the current signal and throughput are already good, whereas a roam should happen if the signal is slightly worse but the estimated throughput is significantly better). This change standardizes the roaming heuristic for signal strength difference requirements and will hopefully improve user experience. The change can be summarized as follows: based on the current signal level, a certain roaming difficulty is assigned. Based on the selected AP's estimated throughput relative to the current AP's estimated throughput, the difficulty is adjusted up or down. If the difference in signal level meets the threshold, a roam happens. The hard-coded values were selected purely based on the previous version of this function. They may eventually need to be fine-tuned for optimal performance. Signed-off-by: Matthew Wang <matthewmwang@chromium.org> |
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| doc | ||
| eap_example | ||
| hostapd | ||
| hs20 | ||
| radius_example | ||
| src | ||
| tests | ||
| wlantest | ||
| wpa_supplicant | ||
| wpadebug | ||
| wpaspy | ||
| .gitignore | ||
| Android.mk | ||
| build_release | ||
| CONTRIBUTIONS | ||
| COPYING | ||
| README | ||
wpa_supplicant and hostapd -------------------------- Copyright (c) 2002-2019, Jouni Malinen <j@w1.fi> and contributors All Rights Reserved. These programs are licensed under the BSD license (the one with advertisement clause removed). If you are submitting changes to the project, please see CONTRIBUTIONS file for more instructions. This package may include either wpa_supplicant, hostapd, or both. See README file respective subdirectories (wpa_supplicant/README or hostapd/README) for more details. Source code files were moved around in v0.6.x releases and compared to earlier releases, the programs are now built by first going to a subdirectory (wpa_supplicant or hostapd) and creating build configuration (.config) and running 'make' there (for Linux/BSD/cygwin builds). License ------- This software may be distributed, used, and modified under the terms of BSD license: Redistribution and use in source and binary forms, with or without modification, are permitted provided that the following conditions are met: 1. Redistributions of source code must retain the above copyright notice, this list of conditions and the following disclaimer. 2. Redistributions in binary form must reproduce the above copyright notice, this list of conditions and the following disclaimer in the documentation and/or other materials provided with the distribution. 3. Neither the name(s) of the above-listed copyright holder(s) nor the names of its contributors may be used to endorse or promote products derived from this software without specific prior written permission. THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.