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Member
Reputation: 21
LTE 20MHz RB misusage
Hello all.
I am running a Huawei LTE TDD 20MHz system. As defined, there are 100 RB available.
But tracing the real usage, the RB usage is only 80 maximun. It never reaches 100.
Do you know possible reasons for that?
THX!
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Post Thanks - 1 Thanks
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2016-11-24 07:49 PM
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Senior Member
Reputation: 372
Re: LTE 20MHz RB misusage
Remember that in TDD the available RB are used in DL/UL. Probably you have a 80 DL/20 UL configuration...
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Post Thanks - 1 Thanks
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Member
Reputation: 21
Re: LTE 20MHz RB misusage
Thanks!
Which parameter and object should I check to find the configuration setting the ratio of RBs for DL/UL?
Thanks again!
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VIP Member
Reputation: 1791
Re: LTE 20MHz RB misusage
Originally Posted by
jkpllan3
Remember that in TDD the available RB are used in DL/UL. Probably you have an 80 DL/20 UL configuration...
that probably is not the reason for it. we have 80/20 config too but we could use all 100 RB.
80/20 subframe config. means during a frame 10 ms frame 80% is DL and 20 % is UL. e.g. for 1st TS which is DL for that 1 ms whole 100 RB are available to use. only during DWpts is the subframe where RB for traffic is chipped.
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Post Thanks - 1 Thanks
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Member
Reputation: 21
Re: LTE 20MHz RB misusage
OK, it is strange.
In our case, we have Huawei LTE TDD 20MHz.
We are using a test eNB with a single user that is me testing.
And making trace monitoring, I can see only a maximun of 80 RBs used in DL (see jpg).
Sin título.jpg
Any idea?
Thanks
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Junior Member
Reputation: 11
Re: LTE 20MHz RB misusage
Hi,
You are using SA2. You could change the subframe configuration to another one.
http://niviuk.free.fr/lte_tdd.php
BR
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Post Thanks - 1 Thanks
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Senior Member
Reputation: 360
Re: LTE 20MHz RB misusage
Please check you cell bandwidth configuration and transport bandwidth capacity.
Originally Posted by
dannthemann
OK, it is strange.
In our case, we have Huawei LTE TDD 20MHz.
We are using a test eNB with a single user that is me testing.
And making trace monitoring, I can see only a maximun of 80 RBs used in DL (see jpg).
Sin título.jpg
Any idea?
Thanks
Best people are those who are useful to others
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VIP Member
Reputation: 1791
Re: LTE 20MHz RB misusage
can you share this counter for the same time when you put trace?
L.ChMeas.PRB.DL.Used.Avg
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Re: LTE 20MHz RB misusage
yo need also to check requested throughput from your drivetest tools. is the requested throughput already maximum?
or need also to check APN-AMBR from RRCconfigurationsuccess message. is the APN throughput granted to give max throughput..
Originally Posted by
dannthemann
OK, it is strange.
In our case, we have Huawei LTE TDD 20MHz.
We are using a test eNB with a single user that is me testing.
And making trace monitoring, I can see only a maximun of 80 RBs used in DL (see jpg).
Sin título.jpg
Any idea?
Thanks
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