WiFi 802.11n Samsung Xcover 4 problem

RouterOS Wireless Networking
1

Hi All,

I have a Capsman configuration with 2x RB751G (only 2.4ghz)
With my lenova laptop it all works ok. 300 mbit wifi connection and about 150 mbit real throughput.

But my Samsung Xcover 4 (SM-G390F) gets only 65mbit. When I connected to a Huawei router (HG655d) I get 72.2 mbit.
Same for my other notebook which has a Broadcom 4313GN 802.11b/g/n 1x1 Wi-Fi-adapter.

It seems that the problem is related to “Guard Interval” being long instead of “short”. Which seems to suggest that the signal is non optimal, however the same client, same room, same short distance different access point shows that the client and surroundig are okay. Also my Lenovo laptop has no problem doing the 300 mbit, which tells me the rb751 is also on hardware level okay. I have tried 4 different unit of the RB751.
It seems to be a compatibel issue between the device and access point.

CONFIG:

# dec/09/2018 10:07:13 by RouterOS 6.42.10
# software id = FW4M-3X2V
#
# model = 751G-2HnD
# serial number = 3A65025BEA46
/caps-man access-list
add action=accept allow-signal-out-of-range=10s disabled=no interface=any signal-range=-75..120 ssid-regexp=""
add action=reject allow-signal-out-of-range=10s disabled=no interface=any signal-range=-120..-76 ssid-regexp=""
/caps-man configuration
add channel.band=2ghz-g/n country=netherlands datapath.bridge=bridge1 datapath.local-forwarding=yes name=cfg1 rates.basic=54Mbps rates.supported=54Mbps \
    security.authentication-types=wpa2-psk security.disable-pmkid=no ssid=Otten
/caps-man interface
add channel.extension-channel=Ce channel.frequency=2412 configuration=cfg1 disabled=no l2mtu=1600 mac-address=D4:CA:6D:67:8D:77 master-interface=none name=KANTOOR \
    radio-mac=D4:CA:6D:67:8D:77
add channel.extension-channel=Ce channel.frequency=2452 configuration=cfg1 disabled=no l2mtu=1600 mac-address=D4:CA:6D:68:80:EF master-interface=none name=WOONKAMER \
    radio-mac=D4:CA:6D:68:80:EF
/caps-man manager
set ca-certificate=auto certificate=auto enabled=yes
/caps-man provisioning
add action=create-enabled master-configuration=cfg1 name-format=identity

[admin@KANTOOR] /caps-man registration-table>  print stats  
 0 interface=WOONKAMER ssid="x" mac-address=58:C5:CB:08:1B:F1 tx-rate="65Mbps-20MHz/1S" rx-rate="65Mbps-20MHz/1S" rx-signal=-49 uptime=47m42s20ms packets=382,264 
   bytes=142478,29376 tx-rate-set="OFDM:54 BW:1x HT:0-7" eap-identity="" 

 1 interface=WOONKAMER ssid="x" mac-address=E0:06:E6:4D:8D:12 tx-rate="65Mbps-20MHz/1S" rx-rate="65Mbps-20MHz/1S" rx-signal=-39 uptime=2m58s210ms packets=2338,2611 
   bytes=1822696,308429 tx-rate-set="OFDM:54 BW:1x HT:0-7" eap-identity=""

Looking at the forum I found this http://forum.mikrotik.com/t/xiaomi-phone-low-wifi-tx-rate/93622/1
Someone has his samsung xcover4 with 72.2 mbit.
But he uses the wAP ac, not the RB751

I have tried with and without capsman. Tried the last stable version.
Is the problem the RB751? Or is it configuration / software issue?

Thanks!

Cheers,
Harry

2

Some details about the mobile phone can be found on:
https://fccid.io/A3LSMG390F/Operational-Description/A3LSMG390F-Operational-Description-Note-for-Samsung-0227-updated-3298140

Although the chipset documentation may indicate possible functions, the following have been permanently
hardware > disabled > in this device and cannot be enabled by the end user or service provider

• WLAN 2.4GHz 802.11n HT40
• WLAN 5GHz 802.11ac

This tells me that 72.2 mbit on 2.4ghz is the maxium for the Samsung Xcover4.
It’s unclear if it’s broadcom chip or not.

Cheers,
Harry

3

I did some testing to see what is the real difference. It’s what you expected about 10% faster.

SAMSUNG XCOVER4 with 72.2 mbit connection

iperf3 -c 192.168.1.200
Connecting to host 192.168.1.200, port 5201
[ 4] local 192.168.178.3 port 58401 connected to 192.168.1.200 port 5201
[ ID] Interval Transfer Bandwidth
[ 4] 0.00-1.00 sec 6.40 MBytes 53.7 Mbits/sec
[ 4] 1.00-2.00 sec 5.89 MBytes 49.4 Mbits/sec
[ 4] 2.00-3.00 sec 6.30 MBytes 52.8 Mbits/sec
[ 4] 3.00-4.00 sec 6.14 MBytes 51.6 Mbits/sec
[ 4] 4.00-5.00 sec 6.11 MBytes 51.2 Mbits/sec
[ 4] 5.00-6.00 sec 6.14 MBytes 51.5 Mbits/sec
[ 4] 6.00-7.00 sec 6.03 MBytes 50.6 Mbits/sec
[ 4] 7.00-8.00 sec 6.22 MBytes 52.2 Mbits/sec
[ 4] 8.00-9.00 sec 6.14 MBytes 51.5 Mbits/sec
[ 4] 9.00-10.00 sec 6.02 MBytes 50.5 Mbits/sec

[ ID] Interval Transfer Bandwidth
[ 4] 0.00-10.00 sec 61.4 MBytes 51.5 Mbits/sec sender
[ 4] 0.00-10.00 sec 61.2 MBytes 51.3 Mbits/sec receiver


SAMSUNG XCOVER4 with 65mbit on RB751

iperf3 -c 192.168.178.252
Connecting to host 192.168.178.252, port 5201
[ 4] local 192.168.178.3 port 37196 connected to 192.168.178.252 port 5201
[ ID] Interval Transfer Bandwidth
[ 4] 0.00-1.00 sec 5.77 MBytes 48.3 Mbits/sec
[ 4] 1.00-2.00 sec 5.55 MBytes 46.5 Mbits/sec
[ 4] 2.00-3.00 sec 5.80 MBytes 48.7 Mbits/sec
[ 4] 3.00-4.00 sec 5.46 MBytes 45.8 Mbits/sec
[ 4] 4.00-5.00 sec 5.53 MBytes 46.4 Mbits/sec
[ 4] 5.00-6.00 sec 5.34 MBytes 44.8 Mbits/sec
[ 4] 6.00-7.00 sec 5.78 MBytes 48.4 Mbits/sec
[ 4] 7.00-8.00 sec 5.47 MBytes 46.0 Mbits/sec
[ 4] 8.00-9.00 sec 5.52 MBytes 46.3 Mbits/sec
[ 4] 9.00-10.00 sec 5.44 MBytes 45.6 Mbits/sec

[ ID] Interval Transfer Bandwidth
[ 4] 0.00-10.00 sec 55.7 MBytes 46.7 Mbits/sec sender
[ 4] 0.00-10.00 sec 55.3 MBytes 46.4 Mbits/sec receiver

W

4

Hi

I replaced the RB751G with a RB951G-2HnD, this solves my issue. Same configuration with CAPSMAN.
It seems the problem is related to the Atheros AR92xx chip and the problem is not there in the Atheros AR9300 chip.

I noticed that other phones also did not get the 72.2 mbit like a iphone SE.

Cheers,
Harry