In general some maxims to follow include, but are not limited to: Some of you may even have your amateur radio tech/general/extra class license, but transmitting potentially encrypted cellular traffic is still prohibited to the best of my knowledge. Even if you did have the required spectrum licenses to transmit (which is highly unlikely), you could still cause serious harm if you by accident intercept or infer with emergency calls from legitimate subscribers. ![]() Some laws in other countries are so strict that even possessing an SDR, let alone transmitting, can get you thrown into jail. Violations of FCC regulations can at best land you a hefty fine. This means you need to be ethical when performing cellular, or any radio-based research for that matter. Technically there are the industrial, scientific and medical (ISM) band frequencies, but even these don’t give you free reign to transmit devices (and humans) transmitting in these bands still need FCC approval and testing. Well sorry, this is one of those “if you have to ask you can’t afford it” deals. But wait, what if you don’t have a license? Do you really need one and how can you get one? If you have the equipment and are properly licensed, you’ll legally be able to setup a cell site of your own. To get a base station up and running you need two things: a software defined radio (SDR) for the radio frontend and a software station implementation that can talk to your SDR. In cellular terminology these are known as the BTS and eNodeB for GSM and LTE respectively, but throughout we’ll stick with base station. In this tutorial we’re going to detail the exact steps my guest author Tyler Tucker and I took to get a 2G (GSM) and 4G (LTE) testbed up and running. Without a background in signal processing, cellular protocol conventions, or the right equipment, debugging why a cellular testbed isn’t working can be a pain, to say the least. Understanding and setting up a cellular testbed for this kind of exploration can be a difficult and frustrating process. etc/rc.d/init.d/functionselse exit 1fi# Avoid using root ' s Tmpdirunset tmpdir# Source networking configuration: /etc/sysconfig/network# Check that networking are up.Have you ever wondered how your smartphone communicates over-the-air? How calls and SMSs reach your phone from across the world? What about how your phone decodes over-the-air messages? Does it do it correctly and what happens if it doesn’t? Well these answers and more lie within the 2 - 5G cellular protocols and their implementations. # Pidfile:/var/run/yate.pid# Source function Library.if Then. #!/bin/sh# chkconfig:-35# description:starts and stops the Yate daemon # used to provide Yate services. We can refer to the run file to write yated: So what if we want to use service commands to manage Yate services? We know that running scripts for services under Linux are typically managed by service. If you want to output debug information to a log file: This requires reference to the operating parameters of the Yate (ran too fast, did not get down the picture) In order to let the future of their own ease, as long as the present self to do a little more work, re-start to build yate environment.īecause there is no CentOS version, had to download Windows source package, this time source: ĭownload using svn: svncheckout YATE-SVNĪfter the download is complete, enter YATE-SVN ![]() Or the honest use of words and pictures of the method to record. As the saying goes: good memory is better than bad writing. Many know things will forget the same, need to re-spend more time to understand and learn. After thinking, a lot of things now understand, will use.
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