I was advised not use 4x4 unless all the CPE were NLOS. The explanation
I was given was that in 4x4's current form the CPE will have difficulty
differentiating between all 4 chains.
In our drive testing we found 4x4 performed worse than 2x2 in most
cases, but it was better for weak/NLOS CPE, which jives with what I was
told. Try 2x4 as a middle ground. I also believe I was told that 4x4
is going to work better when MU-MIMO hits the street.
-Adam
So, an update on this for those who are interested:
VERY preliminary results so far, and I'm not even sure I am willing to
hang my hat on them yet they are so "late-breaking", but:
- Upgrading Compacts on 6.5r1 to 6.6 *seems* to have largely mitigated
this issue for CPE8Ks attached to such Compacts.
- CPE8Ks attached to Compacts already running 6.6 that exchibited
similar symptoms *seem* to be fixed...after turning 4x4TM4 off on the
Compact. :-(
The CPE8Ks on the 6.6 Compacts in 4x4 mode showed other weirdness in
addition to the constant detaches, such as extremely low downlink
throughput (CPE7Ks on the same Compact continued to perform just
fine). Once 4x4 was disabled, throughput issue cleared right up, as
did the CPE detaches.
grrr.
So I guess we continue to run without 4x4.
It wasn't like we seemed to be getting much benefit from it anyway.
We didn't see the SINRs budge at all on any of the CPEs. Maybe we are
doing something wrong? The only thing I did to enable it was 'set
deployment topology SingleCarrier4X4TM4', commit, and reboot.
-- Nathan
*From:*Nathan Anderson
*Sent:* Wednesday, December 21, 2016 3:27 PM
*To:* [email protected]
*Subject:* RE: [Telrad] More CPE8K woes
To be more precise, I should say that a CPE8K that didn't have the
problem suddenly started experiencing it, and this coincided with the
firmware upgrade of the eNB he attaches to. I can't definitively say
that the eNB upgrade actually caused it. It's just an interesting
data point that we definitely have CPE8Ks experiencing this issue
across multiple eNB firmware versions.
-- Nathan
*From:*[email protected] <mailto:[email protected]>
[mailto:[email protected]] *On Behalf Of *Nathan Anderson
*Sent:* Wednesday, December 21, 2016 3:23 PM
*To:* [email protected] <mailto:[email protected]>
*Subject:* Re: [Telrad] More CPE8K woes
EPC is 6.6 0729
We admittedly still have some ENB 6.5r1 (2616) running out there; when
6.6 came out, it wasn't soon after (2-3 months maybe?) we had managed
to stop banging our heads into our desks trying to get everything to
run smoothly and with good performance. We saw some reports of
troubles with 6.6 shortly after release, esp. with 4x4 mode, which we
didn't have to use if we upgraded, true, but it was one of the major
draws of the release, so if we were going to hold off on implementing
that, why rush to upgrade? It was nice to be able to have things run
smoothly for a time and sit back and take a breath.
But 6.5 ENB code doesn't seem to be to blame here; in fact, last
night, I pushed 6.6 out to one ENB, which caused a CPE8K that
previously was not exhibiting these symptoms to suddenly begin doing
so today!
-- Nathan
*From:*[email protected] <mailto:[email protected]>
[mailto:[email protected]] *On Behalf Of *Jeremy Austin
*Sent:* Wednesday, December 21, 2016 3:12 PM
*To:* [email protected] <mailto:[email protected]>
*Subject:* Re: [Telrad] More CPE8K woes
On Wed, Dec 21, 2016 at 2:08 PM, Nathan Anderson <[email protected]
<mailto:[email protected]>> wrote:
Is anybody else out there seeing their CPE8000s randomly drop off the
network
I only saw this on a 1xxx revision of EPC code, and it might have not
been the same precise behavior. What ENB/EPC code are you running?
--
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
<http://doodle.com/jermudgeon>
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