lte book

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

, and the dwpts length of 2nd half frames is 1 ms. Uppts and sub-frame 2 are used as the uplink, and sub-Frames 7 and 9 are used as the downlink.Physical resources Basic time unit Antenna Port LTE uses antenna ports to differentiate space resources. The definition of an antenna port is defined from the receiver's perspective. That is, if the receiver needs to distinguish the difference in space between resources, multiple antenna ports need to be d

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

New Solution for LTE Networks" Mobile, broadband, and IP-based telecommunication services are becoming increasingly apparent. mobile communication technology is in a critical period of network technology evolution. As a unified standard for next-generation mobile communication, the LTE system has many advantages, including high-frequency spectral efficiency, peak rate, high mobility, and flattened network

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

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

role, is the bearer of the current sub-frame pdsch scheduling control information ; the second function is the network side The PDCCH Order is initiated by DCI1A and the non-competitive random access process is triggered . For non-competitive random access related content, please refer to the LTE-TDD random access process (6)-sub-scenario description of competitive access and non-competitive access process.If DCI1A is used as PDCCH Order to trigger

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

LTE system information is one of the key aspects of the air interface. it consists of the master information block (MIB) and a number of system information blocks (SIBs ). the MIB is broadcast on the physical Broadcast Channel(Pbch), while sibs are sent on the physical downlink shared channel (pdsch) through radio resource control (RRC) messages. sib1 is carried by "systeminformationblocktype 1" message. siB2 and other sibs are carried by "systeminfor

Basic Introduction of LTE physical layer (1) The LTE physical layer implements significant technological innovation and performance enhancement. Key Technical innovations are mainly embodied in the following aspects: flexible configuration of time-frequency resources using OFDMA as the basic multi-access technology, and significant improvement in spectrum efficiency through MIMO technology; the use of AMC,

Failure phenomenon:The first time to open "Lenovo understand the Internet", did not appear input Lenovo account and password interface, but prompted: "Mobile network has not yet opened." This condition is run in connection with WiFi and you see the LTE icon in change adapter settings is not enabled.Reason Analysis:The use of pre-installed WIN10 system, in the WIN10 system under the flight mode has a separate set of wireless network, Bluetooth,

Recently, Shanghai released the "12th Five-Year Plan" for the development of the communications industry (hereinafter referred to as the "Plan"), proposing that by the end of the "12th Five-Year Plan", the number of mobile phone users would reach 30 million, 3G and LTE accounts for over 70% of users. According to the plan, by the end of the 12th Five-Year Plan, the number of telephone users in Shanghai reached 38 million, and the number of fixed phon

was opening quickly, which led us to the station, but too late.In the case of slow channel changes, such as indoor or nomadic access services in large cities, it is necessary to use the closed-loop MIMO to further improve the performance of the shampoo.Closed-loop system is the receiving end of the information channel feedback to the transmitter, and then the transmission of data encoding, beamforming or antenna selection and other operations.The feedback method is divided into full feedback or