lte

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

/downstream switching period, the sub-frames 0, 5, and dwpts must go downstream. For a 10 ms upstream/downstream switching cycle, each half frame has dwpts, with only GP and uppts within 1st half frames, 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.

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

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

byte of the DCI =bin (10011111) =0x9f, the value of the second byte =bin (01110000) =0x70 (assuming A11 after the bit is 0).Definitions for each field in the 4.DCI1A formatThis article describes the more DCI1A formats used in the downstream dispatch allocation. PDCCH channel bearer of the DCI1A format of the code stream, it has 2 kinds of functions: the first role, is also the most commonly used role, is the bearer of the current sub-frame pdsch scheduling control information ; the second funct

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

: UnknownChina Band: No　Iv. comparison of FDMA, TDMA and CDMA1. Frequency division is sometimes called channelized, that is, the entire assignable spectrum is divided into a number of individual radio channel transmit and receive carrier frequency, each channel can transmit one voice or control information. 2. Time Division Multiple access is on a broadband wireless carrier on a number of times or called time slots divided into several cent channel, each user occupies a time slot, only in this d

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,

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

Network Splitter | Mobile Internet Collector |100g LTE core network collectorThe RTL9807 flow acquisition equipment developed by Rongteng Network is a new generation NPS multi-core processing platform plus high performance switching chip, based on the ATCA architecture of high-performance 3g/lte acquisition and shunt equipment. Designed for the 3g/lte Core networ

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