LTE user documentation(if there are inappropriate places, please correct me!) )7 using Fading TraceThis section describes how to use the fading traces in LTE emulation. (1) Generate Fading tracesgenerate fading traces by using the code provided by the dedicated MATLAB script (/lte/model/fading-traces/fading-trace-generator.m). The script contains a typical taps c
Understanding CS fallback in LTE
LTE technology supports packet based services only, however 3GPP does specifies fallback for circuit switched services as well. To achieve this LTE architecture and network nodes require additional functionality, this blog is an attempt to provide overviewFor same.
In LTE architecture,
Some key LTE technologies in Vernacular
I have never been in touch with the actual LTE equipment because I am working on CDMA, but I have read a lot of theoretical materials, including the red books. I personally feel that Chinese books are not very good yet, it covers a wide range of topics, but there are very few details. If you want to study it in depth, unless you look at the agreement, but how tired t
Although 4G is commercially available for half a year, the base station has poor network coverage and weak mobile phone signals, but there are still situations where the base station cannot be online or make phone calls. However, if the carrier uses a superconducting link system, mobile phone users do not have to worry about this.
Recently, reporters from a third-party detection agencies to a test results report that the use of superconducting lte rf
Network splitter |3g/lte Service collector | Mobile Internet Collector 1, overview | network shunt | 3G/LTE wireless network monitoring is far more complex than the original Internet backbone monitoring, mainly in the following aspects: The System diversity, China Mobile based on TD-SCDMA Technology, China Telecom is based on the CDMA2000 technology standard, and Unicom is based on WCDMA technology. Theref
With the development and evolution of mobile network communication systems, 3G mobile communication systems are no longer a distant dream. As China Mobile, China Unicom, and China Telecom increase their 3G network construction scale, a new term comes to our eyes, namely LTE. This article will focus on the differences between the 3G network architecture and the LTE network architecture, and explore the
Adax, industry leader in High-Performance Data grouping, processing, security, and network infrastructure, warned that the current LTE signaling infrastructure is insufficient, it is difficult to meet the next wave of 4G deployment needs. Market research firm Strategy Analytics also pointed out in its predictions that by 2017, the total number of LTE users worldwide will reach 1 billion, this means that all
With the mobile phone mobile internet constantly, has basically completed the traditional 2G to 3G transition, at present, China is vigorously promoting the development of 4G, the recent more promising to release 4G Fdd-lte photos, mobile networks such innovations to the user is faster mobile phone mobile device access to the Internet speed, and more stable signal , which also produced a term for LTE. The
Question 11: special sub-frame ratio of LTE sub-frames (Supplement to question 7)
To solve this problem, I didn't quite understand the protocol at the beginning. For example, I often encounter this problem:LTENeutron frame ratio is1, Special sub-frame Ratio7What does this mean?
Search for related questions online. The answers collected online are summarized as follows:
First, in the TDD frame structure, the frame length is 10 ms and is divided into 10
First, the system message concept and its contents si:system information; sibs:systeminformationblocks, except SystemInformationBlockType1, Other system messages are hosted on SystemInformation (SI) messages, and the mapping information for sibs and SI messages is included in SIBType1 scheduling While the SIBs is hosted on the Dl-sch channel, an SI can contain multiple cycles of the same sibs, and a SIB block is only in one SI message, and the SIB Typ
How to make mobile downloads fly together with LTE and Wi-Fi
With the rapid popularization of 4G terminals, LTE seems to be the fastest-transmitting mobile network technology. However, with the gradual rise of 4 k hd videos, how can we further break through the transmission speed in mobile networks?
Based on the current network resource configuration in Beijing, the theoretical peak rate of the downlink n
Topic:"An Introduction to Lte--lte, lte-advanced, SAE and 4G Mobile Communications"Christopher CoxDirector, Chris Cox Communications Ltd. UKPress:WILEYPreface:This was about the world ' s dominant 4G mobile telecommunication system, LTE.In writing the book, my aim have been to give the reader a concise, system level IntroductionTo the technology that
LTE user documentation(if there are inappropriate places, please correct me!) )8 Mobility Model with buildingswe now explain how to use the buildings model in the NS-3 emulator (especially the mobilitybuildinginfo and Buildingpropagationmodel classes) by example To set up LTE simulation scenarios (including buildings and indoor nodes). 1. Included Header files:#include 2. Path loss Model selection:ptr ();
LTE user documentation (if any, please correct me !)
12 radio environment maps by using the radioenvironmentmaphelper class, the radio environment map (REM) file may be output. For example, a uniform 2D mesh value indicates the downlink base station (with the strongest signal at each point) signal-to-Noise Ratio, you can specify whether REM should generate data or control channels. In addition, you can set rbid, which indicates that REM will be genera
Original link:Http://lteuniversity.com/get_trained/expert_opinion1/b/hongyanlei/archive/2009/08/06/cqi-reporting-in-lte.aspx
CQI = channel quality Indicator; signal quality indication;RI = rank indication; Rank indicator;PMI = precoding matrix Indicator; pre-coded matrices indicator;
The CQI is used to reflect the channel quality of downstream Pdsch. Use 0~15 to represent the channel quality of Pdsch. 0 indicates the worst channel quality and 15 indicates the best channel quality.–>ue sends CQI
LTE security vulnerabilities allow hackers to send false emergency alerts
Any electronic technology may have security vulnerabilities, even the mobile network technology itself is no exception. Researchers at the U. S. Pudu University and the University of Iowa have published a report describing the existence of severe security vulnerabilities in the LTE protocol, allowing hackers to launch 10 different at
Multiple access is a multi-address method which is realized by the different code sequences formed by spread spectrum technology. V. LTE (long term Evolution) projectLTE is the evolution of 3G, not a widely misunderstood 4G technology, but a transition between 3G and 4G technology, is the global standard of 3.9G, which improves the 3G air access technology, using OFDM and MIMO as the only standard for their wireless network evolution.LTE provides a p
In LTE, each cell has 64 preamble codes, so how do these preamble sequences preamble sequences generated? This article is intended to illustrate the process of generating a sequence of preamble codes.The set of preamble sequences consists of the root sequence and the cyclic shift sequence generated by the root sequence, which is divided into two large steps:(1) Generate a Zc (zadoff-chu) root sequence xu (n), as a datum sequence(2) Cyclic shift of the
LTE user documentation(if there are inappropriate places, please correct me!) )9 PHY Error ModelThe physical error model consists of a data error model and a downlink control error model, both of which are activated by default. You can use the Ns-3 property system to activate, specifically:Config::setdefault ("ns3::ltespectrumphy::ctrlerrormodelenabled", Booleanvalue ( False)); Config::setdefault ("ns3::ltespectrumphy::D ataerrormodelenabled", Boolea
have been doing the LTE physical layer related work, there has been a doubt, in 36.211 the beginning of a chapter defines the size of TS is 1/(15000*2048) s, why define so a strange unit time.Recently, this was related to the FFT/IFFT process.Assuming 20MHz bandwidth, the standard specifies that we use 2048 points to do the FFT process, the FFT process is the time domain, each time domain symbol has 2048 time domain sample, FFT, converted into the fre
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