4G5GWorld has a new home now. Visit TelecomGrid for new stories and blogs!

LteWorld Forum

Discuss any 4G LTE related topic.

Can Anybody explain differences between CS Call and PS Call ?

Can Anybody explain differences between CS Call and PS Call and if possible with real time examples ?

GUTI and GUMMEI

Hi ,

Is there any difference between MME GROUP ID , MME CODE in GUMMEI & GUTI.I have a scenario where using HeNB GW.HeNB GW sending the GUMMEI where we have different MME GRP ID and MME Code compared to GUTI which is assigned by MME.

LTE spec for system level performance

Hi everyone,

do you know any 3GPP spec to validate system level performance?

Thank you very much.

Best regards,

Natalia

LTE Uplink Throughput Calculation

How can we calculate the LTE UL Throughput

LTE Testing

What are the different tests I can perform to test that an LTE system works or not when delay is introduced on CPRI backhaul between BBU and RRH?
I want increase CPRI delay incrementally and check when the system breaks down and what are the indications of this..Any ideas?

Consumed transmit power vs. differet MCS indices

Hello,

I was wondering is there any way to measure the consumed transmit power (in downlink) for a fix sized packet for different MCS indicies. Imagine eNB wants to send to a specific UE a packet which size is Z bits. What is the difference of consumed power if I send this packet with a MCS = A in ONE TTI, and the other case where it sends the packet with MCS_prime = B (B < A) in TWO TTI?

Monitoring NACK/ACK(instead of monitoring BER)

Does this happen in LTE that the number of NACK are monitored in a transmission, and if they exceed a particular value, the transmission parameters(error rates, symbol rates) might be changed for a better transmission.

EESM

Does anyone have a good reference, or how-to on using EESM? Also, there's the elusive Beta... is there a standard value to be used?

Thanks,
Tom

How to measure spectral flatness in LTE uplink measurements

Can anyone explain the technical details and/or implementation about spectral flatness measurement in LTE uplink?

GW selection (geographically closer) for SIPTO

If a APN is SIPTO enabled, MME has to select the geographically closer GWs during GW selection procedure and continue to do so during UE Mobility. My question is what are the parameters of DNS query and what is the actual syntax of that query for SGW and PGW selection?

Paging in LTE

What are the differences of Paging procedures in LTE and GSM.

Any spec describe the Backward and Forward Compatibility between 3GPP release version

Hi,
I got one spec TS 32.154 is about for this, but I want to know more detail, for example, If rel9 eNB receive rel10 IE even if that is mandatory from MME, any spec to specify how the eNB handle this IE to ensure the operation works normally?

As I known, basically, the new version release should operate backward compatibility, but how about forward compatibility in the old version side?

Frequency of Creation/Modification/Delete of PCRF policies

Hi,
I'm new within PCRF, I would like to know how often a creation/modification/deletion of policy is happening?
Is it something ongoing or it happens once? is it on a daily/weekly basis?

Thanks in advance,

Nir

SRB2 and Data radio bearer

Hi, experts,

eNB receives Sum of INI_CONT_STP_REQ and EPS_BEARER_SETUP_ATTEMPTS from MME but in response its not sending data radio bearer and SRB2 attempts to UE. if you have any idea that what reason it can be, kindly share with me

Where timing advance parameter is reported?

Hi all,

I'm looking for timing advance values in LTE Cell trace files. Could you please tell me in which message the timing advance parameter is reported? I had a look in many 3GPP ASN.1 Class Definitions, but did not find it.

Thanks in advance,

Pedro.