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Nexus 5 max wifi speed?
- Thread starterChad_Petree
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The WIFI chip, because of size constraints was limited to how many streams it can handle since it does other duties too (I think Bluetooth and maybe others). The older phones (Nexus 4 and others) also had 1x1 spatial streams but were limited to 20mhz so that's why their max was 75Mbps (or some 72Mbps which some routers will show). The Nexus 5 has a 40mhz chip so it can link at faster rates. Using iPerf I think doesn' send TCP ACKs so that's why they were able to get 136Mbps which is close to the theoretical 150Mbps (or 144Mbps). In the real world however you wont get anything close to that as the internet works on TCP so it has to ACKnowledge every transmission which slows down reception of new data.
1x1 is relating to the spatial streams that a chip can handle..
In order to send faster speeds the device sends and receives streams at the same time. This is why new routers have 3 physical antennas, each connected to a radio (those are 3x3 ones).
In the N spec, each radio can send at a max of 75Mbps using 20Mhz of bandwidth. When you double that to 40Mhz you get 150Mbps. This is why 3x3 routers can do 450Mbps (vs 300Mbps).
The AC routers use the same layout (of 3x3) but because of their better tech (encoding, compression and such) they can put more information within the same bandwidth (20, 40Mhz) and they can use more of it as well since 802.11AC is in the 5Ghz range. They can then use 80Mhz channels as well.
So for AC per spatial stream is about 86Mbps per 20mhz.
So for AC you get 3x3 x 80mhz = 1.3Gbps (1.286Gbps) or only 600Mbps for 40mhz wide channel.
http://www.merunetworks.com/products/technology/80211ac/
There's a chart on that page which breaks it down a bit more as well as more info.
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As for which it decides to use that depends on a few things.
- If you have the same SSID/Password on both then it will use the stronger signal
- IF you have different ones then it will use whichever you specify till it can't anymore then it will jump onto the next known connection (that is if you have both saved)
- If you only specify 1 frequency to use then it will use that
SYN,SYN - ACK,ACK
the nexus 5 lacks this networking protocol & in turn limits it full DL capabilities?
dam, i need the traffic sniff it on my wifi when i get home, i didn't know this..
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- 6what do you mean with "it's a 1x1 radio"? If I have a router which has both 2.4 ghz and 5 ghz, how does it decide which band will it work with?
The WIFI chip, because of size constraints was limited to how many streams it can handle since it does other duties too (I think Bluetooth and maybe others). The older phones (Nexus 4 and others) also had 1x1 spatial streams but were limited to 20mhz so that's why their max was 75Mbps (or some 72Mbps which some routers will show). The Nexus 5 has a 40mhz chip so it can link at faster rates. Using iPerf I think doesn' send TCP ACKs so that's why they were able to get 136Mbps which is close to the theoretical 150Mbps (or 144Mbps). In the real world however you wont get anything close to that as the internet works on TCP so it has to ACKnowledge every transmission which slows down reception of new data.
1x1 is relating to the spatial streams that a chip can handle..
In order to send faster speeds the device sends and receives streams at the same time. This is why new routers have 3 physical antennas, each connected to a radio (those are 3x3 ones).
In the N spec, each radio can send at a max of 75Mbps using 20Mhz of bandwidth. When you double that to 40Mhz you get 150Mbps. This is why 3x3 routers can do 450Mbps (vs 300Mbps).
The AC routers use the same layout (of 3x3) but because of their better tech (encoding, compression and such) they can put more information within the same bandwidth (20, 40Mhz) and they can use more of it as well since 802.11AC is in the 5Ghz range. They can then use 80Mhz channels as well.
So for AC per spatial stream is about 86Mbps per 20mhz.
So for AC you get 3x3 x 80mhz = 1.3Gbps (1.286Gbps) or only 600Mbps for 40mhz wide channel.
http://www.merunetworks.com/products/technology/80211ac/
There's a chart on that page which breaks it down a bit more as well as more info.
-------------------------
As for which it decides to use that depends on a few things.
- If you have the same SSID/Password on both then it will use the stronger signal
- IF you have different ones then it will use whichever you specify till it can't anymore then it will jump onto the next known connection (that is if you have both saved)
- If you only specify 1 frequency to use then it will use that2i believe hardware wise it's 300 mbps for the nexus 5
but there are not that many servers or routers that will give you this.
i test off a gig server for speedtest, not sure what FCC uses.
i have gig fiber and a netgear R7000 router2
Do you mean with an Access point / Range extender?
It really depends on the hardware you have. I have a TP Link range extender and set it up to use the same SSID. This should mean that it is simply extending the distance of the original broadcast from the router and essentially, I am connecting to my main router, although in practice that does not seem to be the case. When I sit in between the router and the extender, I sometimes can see my signal is low because I am actually connecting to the extender rather than the nearer router and WiFi access seems much slower.
I do have the choice of setting it with a different SSID and in the case of a Windows laptop for example, I could set one as a Preferred network, so it will always connect to SSID1 unless not in range and it would connect to SSID2.
At the moment, I am struggling with the range extender set up though.
Edit, oh just seen what you were quoting the first time round. Same sort of answer though. If you connect to the 5GHz and the 2.4GHz became stronger, it wouldn't auto switch1
it still drops to 40 mbps due to nexus 5/avdroid bug. have turn off/on wifi to fix a couple of times a dayWow. Actually 300Mbps from a Nexus 5? What does your Link speed show for your SSID? I don't think I've seen my Nexus 5 with a Link speed over 150Mbps, and this is on a 5GHz Access Point that my notebook connects to at 300Mbps.1Thanks for all the info, I have to reread it because I didn't understand all of it hahaha, what do you mean with if they have the same password? you mean the router and the modem?
Your 2.4Ghz and 5Ghz frequencies on the router can have 2 different SSIDs or the same. Most people use different ones as a way to identify them but also doesn't allow roaming between them since the device will see it as a separate network.
