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Revision as of 05:45, 3 December 2018 by Valentin
The FTM Responder device is pre-assemble with software image on SD Card installed on the FTMR device (e.g. Compulab Fitlet2).
The software image based on Yocto BSP for Intel E3900 is pre compiled with Intel AC8260 WIFI driver supporting 11mcFTM Responder mode, Bluetooth driver for AC8260 and set of network services to enable out of the box operation. A user can deploy the device with default setting, apply power and the FTMR device will boot automatically and start operate. You will be able to scan with your mobile and detect the FTM Responder device as well measure FTM Ranges from our mobile few minutes after FTMR is power on. For transferring data via FTMR device, please refer to the above chapters describing network topology deployment and backhauling mode and configuration. If there is no backhaul connected to the FTMR device, the FTMR device will automatically serve responding to Wi-Fi location range measurements request sent by mobile devices supporting 11mcFTM and certified by the WIFI Alliance for Wi-Fi Location .
The following sub chapters describe the out of the box configuration as well parameters that the user can change within the FTM Responder device.
In order to connect to the FTM Responder device you shall use remote PC connect to the FTMR via SSH.
Note: Changing parameters within FTM Responder is only for qualified technician who is familiar with FTMR device technical details.
Out of the Box Configuration
1) Wi-Fi Backhaul (BH) – Association with a Wi-Fi network:
The FTM Responder device will search automatically for an access point (AP) named “INTC_FTMR1”, with password “WCSLCDFTMR”, operating at 5GHz band. If such an external access point detected, the FTM Responder will connect and associate to the Access Point and use the AP’s Wi-Fi channel for FTM and SoftAP. In case the FTMR device does not detect the external access point configured for FTMR Wi-Fi Backhauling, the FTM Responder device will restart its Backhauling interface and try to reactivate it every 15 minutes, searching for an External Access point with SSID defined in the FTMR file /etc/wpa_supplicant.conf.
2) FTM Responder device Wi-Fi SoftAP : a Wi-Fi interface enabling for mobile devices to associate and transfer data over Wi-Fi network created by the FTM Responder device:
Channel is set according to Backhauling of the external Access point that the FTMR will be associated (in case of Wi-Fi backhaul mode). Note: If the external Access point with specific SSID defined for FTMR Wi-Fi Backhauling is not in the RF range of standard radio signal between the External Access point / Router and FTMR the FTMR will not associate automatically to the external Wi-Fi Access point. In case the FTMR is not associated after boot to external Access point (Wi-Fi Backhauling),the SoftAP and FTM Wi-Fi channel set in /etc/hostapd.conf will be used. Default channel defined in the hostapd.conf for “out of the box” is CH48 (Freq. 5240 MHz).
i. Channel Bandwidth (BW) : 80MHz. ii. SSID#1 (SoftAP) : DO_NOT_CONNECT note: this is the SSID that a mobile device can be associate in order to transfer data over Wi-Fi via the FTM Responder device in case a backhauling is connected to the FTMR device. You can change SSID#1 name to another name in all the hostapd.conf files within all the FTMR responder devices in case you prefer to use other SSID#1 name. iii. Password (for SSID#1): responders
Out of the box values (in the hostapd.conf file):
Parameter name |Out of the box value --------------------|-------------------- Interface wlp1s0 Channel 48 vht_oper_chwidth 1 (80 MHz) (channel BW) SSID (#1, SoftAP) DO_NOT_CONNECT ht_capab [SMPS-DISABLED][HT40-] hw_mode A
FTM Responder: Configuring parameters
In case there is a need to configure the FTMR parameters, this can be by configuring the following files.
There are 3 files that the a qualified technician and System integrator who deploy FTM Responder devices in a venue can edit, in order to set the deployment parameters different than the out of the box deployment:
This file holds the data on the SSID (SSID#2 of the External Access point allocated for Wi-Fi Backhauling) and Password of the external Access point that the FTMR to be associated in order to establish a Wi-Fi backhaul network connection between the FTMR and the external nearby access point. Note: in case you want to ensure No automatic connection of Wi-Fi Backhauling established, you can define a SSID#2 with a name that the FTMR will never be able to associate to external Access Point
File is located at /etc/wpa_supplicant.conf
Parameter Out of the Box WiFi BH SSID (#2) INTC_FTMR1 WiFi BH Password WCSLCDFTMR
This file holds all parameters of the SoftAP that is visible to the user from the responders network.
File is located at /etc/hostapd.conf.
Parameter Out of the Box settings interface wlp1s0 channel 48 vht_oper_chwidth 1 (80 MHz) (channel BW) SSID (#1, SoftAP) DO_NOT_CONNECT ht_capab [SMPS-DISABLED][HT40-] hw_mode a
In this file, it is possible to enable / disable the Wi-Fi Firmware behavior, using some parameters
File is located at /etc/modprobe.d/iwlwifi.conf.
Parameter Out of the Box settings CAM mode options iwlmvm power_scheme=1 enabled ASAP mode options iwlwifi ftm_resp_asap=1 enabled Read options iwlwifi nvm_file="nvm-sfp-b2-open.bin” - COMMENTED configurations from bin file is disabled
The end 2 end topology to serve multi-client by single FTM Responder optimize when FTM Responder are set to operate in ASAP mode (this mode is define in the 802.11REVmc protocol).
In case you want to verify that the configuration is set to ASAP mode: check the file, by running “cat /etc/modprobe.d/iwlwifi.conf” The file should contain the following lines: options iwlmvm power_scheme=1 options iwlwifi ftm_resp_asap=1
FTMR Configuration: Changing channel and BW
The “out of the box” configuration of the FTM Responder software is set to 5Ghz band CH48 , 80Mhz Channel Bandwidth.
For 5Ghz band, it is recommended to use channels 36, 40, 44, 48. Other channels that allowed per country regulation are subject to WW regulatory requirements. Note that in order to comply WW regulatory, some channels are not supported (e.g. DFS channels are not supported), or channels are per Country regulation.
Modifying channel and BW is possible and done by editing hostapd.conf that resides within the GalileGen2 FTM Responder device.
File location: /etc/hostapd.conf
Change SoftAP channel
a. Edit line: # If CONFIG_ACS build option is enabled, the channel can be selected # automatically at run time by setting channel=acs_survey or channel=0, both of # which will enable the ACS survey based algorithm. channel=48 Change the number to the desired channel b. Edit line: ht_capab=[SMPS-DISABLED][HT40=] Change the sign (HT40+/-) according to table A (next page).
Change channel bandwidth
For 80 MHz
a. # ieee80211ac: Whether IEEE 802.11ac (VHT) is enabled # 0 = disabled (default) # 1 = enabled # Note: You will also need to enable WMM for full VHT functionality. ieee80211ac=1 b. # 0 = 20 or 40 MHz operating Channel width # 1 = 80 MHz channel width # 2 = 160 MHz channel width # 3 = 80+80 MHz channel width vht_oper_chwidth=1
For 40 MHz
a. # ieee80211ac: Whether IEEE 802.11ac (VHT) is enabled # 0 = disabled (default) # 1 = enabled # Note: You will also need to enable WMM for full VHT functionality. ieee80211ac=0 b. # 0 = 20 or 40 MHz operating Channel width # 1 = 80 MHz channel width # 2 = 160 MHz channel width # 3 = 80+80 MHz channel width vht_oper_chwidth=0
For 20 MHz
edit same as for 40 MHz, and also
c. ht_capab=[SORT-GI-20] d. require_ht=0
Table A: HT Capability Signs
Channel HT Sign 36 + 40 - 44 + 48 - 52 + 56 - 60 + 64 - 68 + 72 - 76 + 80 - 84 + 88 - 92 + 96 - 100 + 104 - 108 + 112 - 116 + 120 - 124 + 128 - 132 + 136 - 140 + 144 - 149 + 153 - 157 + 161 - 165 + 169 - 173 + 177 -