Is it possible to get retransmission rates for uplink? I thought only downlink stats were available from the eNB (which makes sense, since the eNB would have no idea how many times each CPE had to retransmit unless the CPEs were reporting that information back to it somehow). Are you talking about pulling figures from the CPE somehow, or getting this information elsewhere?
On the sector I'm looking at, single retransmit blocks in the DL direction are about 1.4% of total blocks. According to old notes I have, 1% is supposed to be good. I don't know whether I should worry about the extra .4%, but I'm also not sure how this relates to uplink health (if at all). As far as percentages go for uplink modulation, 87% of all uplink bits were sent MCS 23, if we include MCS 20 + 23 together that rises to 91%, and if we include 19 + 20 + 23 together, that accounts for 94%. Are those good numbers? They seem fairly good to me. (I sure would love to see what individual CPEs are doing for modulation in either direction at any given time...) We have also been raising uplink AMBRs as well to help deal with this. Which seems to help some, and which I think is weird that it helps. For example, if I have uplink limited to 1.5Mbit/s, a radio on this sector might be able to average 300-400kbit/s. If I change that radio to an AMBR profile that has the uplink limit set to 10Mbit/s, then all of a sudden in the same conditions (minutes later, after changing that UE's profile and kicking it off the EPC) I see more like 800-1000kbit/s from the same CPE! These numbers are the same with both iperf TCP (on the radio) or RouterOS bandwidth-test (router behind the radio), 5 parallel streams in either case, very repeatable (at that same time of day). What the...? If roughly 1Mbit/s of capacity is available, and a given UE is set to 1.5Mbit/s of upload, why can't it achieve that 1Mbit/s unless I raise it to some crazy high number first? Why does throughput instantly double when I lift that AMBR value? So it sounds like you are telling me that you are doing a similar thing and just cranking those AMBR numbers way up on the EPC, but then you are using something else (RouterOS?) to queue packets up upstream? And you get better performance this way? I believe it based on what we have experienced (above), but it seems to me that this really shouldn't be the case. Shouldn't the EPC be working in tandem with the eNB to provide the best and most efficient airtime utilization possible? I don't think the issue with iperf is with you. I cut my teeth on iperf2 and even I can't get it to work right on the Compacts and BreezeWay. From what I can tell, problems appear to be multi-fold. BreezeWay has a "drop all TCP connections indiscriminately" rule at the end of its iptables firewall input chain. That's the primary problem as far as I can tell. Once that is out of the way, or an exception is added for TCP port 5001 earlier, it works, but the bundled iperf binary is somewhat buggy. The -r and -d options don't work right and the device that is playing the iperf server role fails to connect back to the other in client mode and crashes out when it is time to run a reverse-direction test. So you have to individually launch iperf as a server on both ends separately in order to test both directions. I remember running into a similar problem with the iperf2 binary packaged with some version of Ubuntu a while back, and I had to grab the iperf sources, patch them, and rebuild them before that switch worked right. It appears Compact and BW both have unpatched 2.0.5 with at least this bug present. -- Nathan From: [email protected] [mailto:[email protected]] On Behalf Of Jeremy Austin Sent: Wednesday, December 21, 2016 10:22 PM To: [email protected] Subject: Re: [Telrad] More CPE8K woes On Wed, Dec 21, 2016 at 7:44 PM, Nathan Anderson <[email protected]<mailto:[email protected]>> wrote: but this upload capacity thing is what caused me to try pushing 6.6 out to more Compacts, even though I have read reports of similar-sounding issues from others here who have fully upgraded...just wanted to make sure I have all bases covered. We haven't had stability issues per se with 6.6. We've had some success raising upload AMBR, and shaping upstream. What kind of retransmission rate are you seeing on the constrained sectors in the upload direction, in extended stats? We have one in particular that — despite having a verified clean channel — acts as if it's experiencing interference. Despite a very high SINR! And some truly bizarre spectrum analyzer results that aren't corroborated by other, colocated ENBs. I'm also not finding it easy running iperf between EPC and ENB, at Telrad's recommendation. I must be more used to the syntax of iperf3, because I don't have it correct yet. -- Jeremy Austin (907) 895-2311 (907) 803-5422 [email protected]<mailto:[email protected]> Heritage NetWorks Whitestone Power & Communications Vertical Broadband, LLC Schedule a meeting: http://doodle.com/jermudgeon
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