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cauldron
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60GHz PtP : how to optimize wAP 60G for audio/video applications with poor jitter tolerance

Sat Jun 23, 2018 7:48 pm

Audio or video streaming are usually a continuous IPv4 UDP packets flow. I noticed that there are very few parameters to customize the 60GHz physical wireless layer in the RouterOS CLI interface (/interface w60g ...). Unfortunately, the "/interface wireless wlan1 ..." can not be used with w60g physical interface...

Perhaps there are some parameters to enable the "block ACK" or other useful options to decrease the waiting time or the hw-retries setting even at the cost of packet losses?



802.11ad are standardizing 60 GHz technology to facilitate multi-gigabit-per-second
communications over shorter distances. This standard has many new features to improve and
sustain high-speed communications with TDMA single-carrier and OFDM schemes. They allow
for scheduled and contention-based access, beamforming, and power-save mechanisms that
decrease power consumption and increase throughput...

802.11ad defines a frame acknowledgement (ACK) policy called block acknowledgement.
When block ACK is enabled, the transmitting station transmits a block of frames one frame at a
time immediately after each other without waiting for the receiver to acknowledge the
previous frame. After the entire block of frames has been transmitted, the receiving station
sends a control frame called block ACK that includes a bitmap. The bitmap, in which each bit
corresponds to a frame, indicates which frames were received successfully and which ones
were not. The receiver knows to send a block ACK frame when it receives a block ACK request
frame from the transmitter. This ACK policy allows the transmitter to use shorter IFS between
frames, and it eliminates the IFS between each frame and its individual ACK frame, as in a
typical stop-and-wait protocol...
 
pe1chl
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Re: 60GHz PtP : how to optimize wAP 60G for audio/video applications with poor jitter tolerance

Sat Jun 23, 2018 8:22 pm

Of course in the current MikroTik devices on full-speed links the ethernet is the bottleneck and there is enough room on the radio channel especially when using large packets...
So there would be no obvious improvements from such techniques as back-to-back frames never occur.

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