317 questions
0
votes
0
answers
17
views
in Diameter Protocol Does a DRA need to show all the relevant applications or just relay application?
When creating a DRA (Diameter Routing Agent), in the CER/CEA do you need to have all the relevant Applications that the DRA allows or is the Relay Application (4294967295) enough?
I managed to get a ...
- 330
2
votes
2
answers
117
views
Does SM-DP+ has access to MNO specific keys in the eSIM realm?
As you know in the eSIM realm, for the customer model, SM-DP+ is responsible for loading the MNO provided profile into the eSIM chip; and, after loading such profile, the final end-user, can ...
- 63
0
votes
0
answers
24
views
Connection to The Things Network whit LR-FHSS
Context
I'm currently trying to connect to TTN whit LR-FHSS modulation, this is suppose to be supported by the Things Stack (Check that here), I'm using a LR1110 (this DevKit), using the LoRaWAN 1.0.4,...
- 1
0
votes
0
answers
21
views
How can we determine whether a SIM-Swap has occurred within a specific timeframe (hours/days/etc.) for a mobile user (MSISDN)?
In the context of SIM-Swap functionality, I'm seeking a method to extract the following details from DIAMETER messages interfacing with the HSS, or any network interface that offers such information:
...
0
votes
0
answers
58
views
MIMO channel Shannon Capacity
How do i add the capacity of a MIMO link with NR=2 and NT=4
clear all
clc
%Shannon capacity
snr=0;
for i = 1:10
snr = snr +2;
c=(log(1+10^(snr/10)))/log(2);
x(i)=snr;
y(i)=c;
...
0
votes
0
answers
45
views
BladeRF Setup: Srsenb Tx and Rx always 0
After building srsLTE from source referring from this article(https://hernan.de/blog/creating-a-cellular-testbed-with-yatebts-and-srslte/).When we run srsepc and srsenb the Tx and Rx values are always ...
- 1
0
votes
1
answer
251
views
Understanding Digit Repetition in Phone Numbers
I am currently working on a project that requires validation of phone numbers, and I'm curious about the potential repetition of a single digit within a phone number. In a typical phone number, how ...
0
votes
1
answer
82
views
Matlab 256-Qam Inphase values remains at -15 whiles the Quadrature values change
I have a vector of integers I am parsing a qam modulator in matlab using the qammod command, however I noticed when i plot the graph the quadrature part changes but the in-phase part remains at -15. ...
1
vote
0
answers
54
views
CGrateS - passing account's balance to GrantedUnit (4g)
I am using the latest version of CGrateS for my billing system and using open5gs for core system.
When updating sessions we reply with a GrantedUnit which is some constant.
For example, imagine an ...
1
vote
1
answer
330
views
Issue with message reconstruction using 16 QAM mapping in Python code
I am working on a Python code that involves message transmission and reception using 16 QAM mapping. However, I am encountering an issue where I am not getting the original message as expected.
code:
...
- 140
0
votes
0
answers
56
views
How to find the average transmitted energy per symbol (E) and Spectral Noise Density (No)?
I am trying to duplicate the Figure 3 in Matlab of the paper "Intelligent Reflecting Surface Assisted Terahertz Communications".
But, I cannot figure out how to find the values of E and No ...
- 1,270
0
votes
1
answer
60
views
Squared magnitude of the scattered field versus observation angle
I am trying to generate the figures in the paper [Intelligent Reflecting Surfaces at Terahertz Bands: Channel Modeling and Analysis][1]. Figure 2 is as below.
[![enter image description here][2]][2]
...
- 1,270
1
vote
0
answers
53
views
Is there a convention or rule used to name AAA interface in 3GPP?
Appologize if this has been answered.
I'm looking for what Gx, Gy, Cx interface stands for or What does single character mean.
Is there a convention or rule used to name AAA interface in 3GPP?
It ...
- 11
1
vote
1
answer
222
views
Is there a way to identify if the registrations on sip server are made from same application?
I am using Sip.js library to create a calling app. There seems to be times when the application registers itself multiple times, I have used ua.stop() method which serves the purpose of stopping the ...
- 11
1
vote
0
answers
49
views
Swift/iPad OS Network-Free Communication
Is it possible to let two Apps on two iPad communicate with each other, wothout them having a connection to the Internet?
My Problem is, that I want to create an app, where Multiple iPads communicate. ...
- 11
0
votes
1
answer
111
views
What happens if there is an error in the CRC code itself for a signal?
We using crc algorithm to detect errors , and we send with our message crc code , but what happened if an error occurre when we send it ? And how we detected?
I try nothing to do , but i guess that we ...
- 63
-1
votes
1
answer
383
views
BER result in MATLAB
I build a pam-2 modulation, then I make a pulse shaping with half sine (matched filter).
Then I send it through the AWGN channel.
At the end I do down sampling and demodulation.
But i have problem ...
- 383
0
votes
0
answers
131
views
How to open .pmd and .ocd files using python?
I'm working on my own fiber optic analysis software. Nevertheless, I'm facing a challenge in opening files about Polarization Mode Dispersion (.pmd) and Chromatic Dispersion (.ocd). OTDR curves (.sor) ...
2
votes
0
answers
501
views
How to trigger TS.43 entitlement flow with ImsServiceEntitlement app
I have a back end application which is supposed to work as Entitlement server in TS.43 flow ( https://www.gsma.com/newsroom/wp-content/uploads//TS.43-v8.0-3.pdf ). I want to test this application by ...
- 43
2
votes
0
answers
226
views
Information about the secondary cell when using android?
I wonder how I can get information about the secondary NR cell when connected to NSA 5G? Is there currently existing any method in android that can access and retrieve the information about the ...
2
votes
1
answer
1k
views
Does WebRTC enable peer to peer connectivity given no internet connection?
Given a state in which the cell towers are down and out of function, there is no internet connection, would WebRTC be able to form peer to peer connections?
Such that in case connection is lost to a ...
- 244
0
votes
2
answers
190
views
Why are 4b5b and 8b10b categorised as line code?
I have been reading https://en.wikipedia.org/wiki/Line_code, but it is not obvious to me why 4b5b and 8b10b are called line code.
What is the fundamental difference between line code and more ...
- 1,279
6
votes
0
answers
378
views
Carrier app throws SecurityException when adding an APN
We have an eUICC with carrier privileges, we are able to check the privileges by
telephonyManager.hasCarrierPrivileges() and it returns true.
Android documentation says that we are able to use the ...
0
votes
0
answers
29
views
Can we assign the users that located within the range of blue stars and black dot?
Is there a way to assign the RED points which are located within the Red STARS range (assume STARS have range (as circle) is 100m raduis), while the other RED points that are located out of the STAR ...
1
vote
2
answers
699
views
Difference between Cellular calls and VoIP calls in LTE?
What is the difference between Cellular calls and VoIP calls in LTE. As both use IP packets to send data to EPC. Without internet VoIP calls doesn't work but cellular calls work. Am I missing ...
- 13
0
votes
1
answer
402
views
Reassembly of segments
I am working on an application that intercepts various kinds of traffic. Recently I have been receiving out-of-order segments. This traffic is over TCP. The SIP header is among multiple segments. I am ...
0
votes
1
answer
1k
views
How to calculate the traffic intensity of an access link?
I am a computer science student and in my telecommunications course, we were asked a question that I can't solve. Here is the statement:
Either the local network below that accesses the Internet via a ...
- 1
0
votes
1
answer
110
views
is it possible to use android cellphones Telecommunication hardware to transmit and receive radio messages?
Is there a way to turn android phone 4G hardware to a module that can transmit any radio messages or make p2p connection with another phone?
0
votes
1
answer
1k
views
Diameter: Unknown Application Id upon decoding using tshark
I am trying to decode raw frames of a diameter call using tshark, all the fields: Command code, Application Id, AVPs are labelled as 'Unknown'. This labelling is followed by a sentence 'if you know ...
0
votes
1
answer
74
views
Trying to reduce gaussian noise
I'm trying to minimize gaussian error by trying to average out my data set of 512x60000 into one having 512x1000. I'm doing this by averaging 60 columns row-wise but it's not working(index error- ...
0
votes
2
answers
244
views
Carrier Sense Multiple Access with Collision Detection and Ethernet [closed]
I had a doubt, CSMA/CD is used by Ethernet. Ethernet is end to end, ie connected between two nodes. I hope, It has different channel for transmission and reception. Then how could a collision occur. ...
- 139
1
vote
0
answers
509
views
USSD Request will not show any response for a certain short code
I am using a SIM Modem accessed via Putty from my windows pc. Everything works fine, I can send at commands and receive results for example AT+CUSD=1,"*133#",15 will return +CUSD: 0,"...
- 11
0
votes
0
answers
57
views
Omnet++ need statistics on delays
I have a finished project, it works,
But I need statistics and graphs, but at the end (when the sca file is being generated) Very little information is generated there.
How can I fix this?
my network
...
0
votes
1
answer
563
views
How to recreate a join accept downlink message in LoRaWAN?
In the last months I've been working on my PhD thesis, which involves breaking LoRaWAN in a few ways (I'm studying cybersecurity) and I'm 1mm near to my goal, but I'm quite stuck on a stupid thing. I'...
- 108
0
votes
1
answer
104
views
Is it possible to extend and customize a mobile service provider's network?
I have tried asking around but I can't seem to find the answer that fits my situation.
I am in a rural area and the network here is terrible.
I want to extend the existing telecommunication companys' ...
- 165
0
votes
1
answer
86
views
What is the rationale for the encoding procedure described in the DVB-S2 standard for LDPC codes?
I have not found an explanation on why accumulating the given parity check addresses and then xoring the accumulated values gives the codeword of the LDPC code. The close it gets the Wikipedia ...
0
votes
1
answer
185
views
How to find the filter coefficients for a DVBS2 shaping SRRC?
in the DVBS2 Standard the SRRC filter is defined as
How can i find the filter's time domain coefficients for implementation? The Inverse Fourier transform of this is not clear to me.
1
vote
1
answer
588
views
Matlab - Chien Search implementation initialisation
I'm trying to implement a DVBS2 (48408, 48600) BCH decoder and I'm having troubles with finding the roots of the locator polynomial. For the Chien search here the author initialises the registers ...
1
vote
1
answer
221
views
What's the correct way to implement the BaseBand scrambler of DVBS2?
I'm trying to implement a transmitter based on the DVBS2 standard.
The guideline document shows a feedback shift registers for which the input does not depend on the message sent
DVBS2 base band ...
0
votes
2
answers
587
views
Is there a way of sending and receiving signals for modulated signal's using python?
Ive been trying to find ways of sending modulated signals on python which then later down the line do analyses on the data sent and received.
At the moment i just want to be able to send data using a ...
- 3
1
vote
1
answer
726
views
Triangle Pulse with fourier transformation
I have a basic exercise for telecommunications with matlab, and i must plot a triangle pulse with (-c,0) to (c,0) with c = 6 and Amplitude = 1 in a for loop for M pulses and approach the periodic ...
- 11
1
vote
1
answer
583
views
Error: using abs Complex integers are not supported
I get class:int16 type data using "audioread(filename, 'native')", which is a data IQIQIQ... stream. Then, I use complex(I, Q) to form the complex data samples. When I do abs(complex(I, Q)) ...
- 37
4
votes
1
answer
2k
views
Can I register Web RTC app as Calling app
I have web rtc implemented in a webview. Everything working fine as long as app in foreground.
Now if the app is in background/dose mode. I want to show a ringing screen like what's app.
I am having ...
- 34.3k
0
votes
2
answers
325
views
SIM Cloning Threat - HLR Security
I have an HLR security question in terms of risk assessment, which is broadly beyond my areas of expertise.
If an HLR was potentially hacked, would that create a risk of SIM card cloning (among other ...
- 1
0
votes
0
answers
604
views
How to solve error performing FM Demodulation in octave?
I am trying to demodulate a modulated FM Signal. As you can see in the code below I use fmmod to modulate the FM signal, however when I use fmdemod or ademodce then neither returns anything similar to ...
3
votes
1
answer
1k
views
Cannot detect CellInfo NR on Samsung S20
I am trying to detect 5G Nr cell info on Samsung S20 (T-Mobile) using Android API
CellIdentityNr
https://developer.android.com/reference/android/telephony/CellIdentityNr.html
and
CellSignalStrengthNr
...
- 151
0
votes
2
answers
611
views
what is sccp called digits in ss7?
i have a query
select count(distinct imsi) from SS7 where sccpcalleddigits like '86133%' .
what does this sccpcalleddigits mean? I am completely new to this domain.
- 139
-1
votes
1
answer
144
views
Do you have some advices about signal processing on binary time series?
I have a binary time series with some ASK modulated signals in different frequencies inside of it.
Let's say it's something like this: x = [0,0,0,1,1,1,1,0,0,0,0,1,1,1,1,0,0,0,0,1,1,1,1,0,0,0,0,0,0,0, ...
0
votes
0
answers
59
views
How to send data transparently using a GSM modem?
I want to send data to a remote modem+device using a local GSM modem attached to my PC.
At our customers premises with a local modem server it works as follows:
16:16:55.731 COM202 : » A
16:16:55.731 ...
- 1,466
2
votes
1
answer
5k
views
SMPP: submit_sm and deliver_sm
What is the difference between submit_sm and deliver_sm operations in the SMPP protocol?
When to use each one?
- 56