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Wi5 / odin-wi5

Odin framework: Patches + Wiki (Instructions)
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Send a TPC Request Element from the AP to the STA #7

Closed josemariasaldana closed 7 years ago

josemariasaldana commented 8 years ago

Note: This assumes Objective #4 has been achieved. Otherwise this information makes no sense, as it would be useless. If the power cannot be changed, then why should we get its value?

The idea is that the Controller should be able to know the power and the link margin of a STA.

This implies that the AP has to build a TPC Request Element (see 802.11-2012, Section 8.4.2.18).

Then we should see if the STAs answer or not.

haizeiwang507 commented 8 years ago

@ josemariasaldana Hello,I plan to achieve the function about: enable per-packet TPC on AR9002 based chips.but my openwrt version is lower (git clone git://git.openwrt.org/14.07/openwrt.git), there is no TPC function in ath9k(compat-wireless-2014-05-22) , Can you tell me your openwrt'version? I can't install openvswitch before when openwrt'version is higher. thank you!

josemariasaldana commented 8 years ago

Hi,

If you could help us enabling per-packet TPC, it would be great.

We have been working with OpenWrt 14.07 so far. But I think there would be no problem on moving to another version if it is necessary to make per-packet TPC run. Do recent versions support it?

As you say, it seems there is some issue with openvswitch in that case. We could try to fix it in that case.

BR, Jose

haizeiwang507 commented 8 years ago

HI, First it must have TPC function If we want to enable per-packet TPC, the TPC is added after backports-4.0.1-1.tar (we can found in 'static ssize_t write_file_tpc write_file_tpc' of backports-4.0.1-1/drivers/net/wireless/ath/ath9k/debug.c) ,so the first problem is how to use backports-4.0.1-1 in odin.

josemariasaldana commented 8 years ago

Well, the first objective would be to have an openwrt version with backports-4.0.1-1 driver. After that, applying the patch would be straightforward (you only have to add two blocks of code). So we could use that in Odin.

Are you planning to try this?

haizeiwang507 commented 8 years ago

yes. but it's not easy to have an openwrt version with backports-4.0.1-1 driver.

haizeiwang507 commented 8 years ago

@ josemariasaldana Hi, i have put the patch of TPC to the odin systerm and changed tcp_enable=ture (Default is flase in ath9k/hw.c), but i can't run tpc function(with comand : set phy phy0 set txpower limit [10]).my network card is ar9280. and i have find some explain in ieee802.11h about tpc. it had used in 802.11n 5G in Europe ,it seem to say that tpc is use from STA to STA . now , i plan to use tpc in AP mode ，but the information about tpc operating mechanism is too less that i have not found ever , (maybe tpc mechanism is used in your country ,can you help me?such as packets catched by tcpdump when tpc running or some informations ), Thanks

josemariasaldana commented 8 years ago

It seems that per-packet TPC is not possible. Although Click writes it in the Radiotap, the Linux kernel just ignores it.