lte failover

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

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

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

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

ICIC:Inter Cell interference coordination, inter-cell interference coordination technology. For cellular network cell throughput is the key limit of the target is the cell disturbance, especially the cell edge users. Because the LTE system supports a frequency multiplexing factor of 1, the meticulous management of inter-cell interference is particularly important.The Icic design guideline is to increase the throughput of edge users without decreasing

Redirection in LTE means that the system uses redirectedcarrierinfo in the rrcconnectionrelease message to indicate that the UE will attempt to reside in the specified system/frequency point after leaving the connection state.LTE supports intra-system redirection and bidirectional inter-system redirectionCommunity redirection is divided into based onMeasurementAndNon-MeasurementU when you select measurement-based redirection, after receiving the measu

UBuntu 14.04 LTE under host name and IP address resolution some related configuration files:/etc/hosts: Host file. Manually configure the mapping between the IP address and the host name. The format is one map bar item per line: /etc/network/interfaces: Host network interface configuration file, both Ifup and Ifdown commands depend on it./ETC/RESOLV.CONF: Name Server (DNS) configuration file, and actually /etc/resolv.conf is a linked file that points

Tags: class business body Difference Telecom diameter bring APN dynamic"Technical stuff." What is the difference between the user database HSS in LTE networks and the HLR of traditional 2g/3g? Can I combine networking?EPS HSS and HLR are respectively responsible for 4G user data and 2G/3G user data storage, the two main differences are:(1) different stored data, including user dynamic information and static contract data, HSS storage user 4G dynamic i

1. Several Concepts about active/standby are clarified: FailoverLinkFailoverLink is used to communicate with each other's working status. The information transmitted on Failoverlink includes the current status (active and standby) of the o device) o Power status (available only based on the dedicated failover cable) oHello Information Package (also sent through all other ports) oAct 1. Several Concepts about Master/Slave are clarified:

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,

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

With the comprehensive commercial use of 3G, as the world's 4G (or the last 3g) candidate standards of TD-LTE technology has become the focus of the 2010 China International Information and Communications exhibition of major equipment manufacturers. The commercial applications of several equipment manufacturers can be seen in the previous article "2010 communications exhibition under triple play. This time, let's take a look at the most direct impact

First, we need to understand power control (3 gppts 36.213). When the mobile phone is far away from the base station, in order to ensure the quality of the call, we need to increase the sending power appropriately. When the distance is far to a certain extent, but there is no available peripheral cell, you need to reduce the service quality (e.g. bitrate ). In 3G networks such as UMTS and WCDMA, power control is needed at cell edge since channels are interfere each other. In the

general, the Turbo code member encoder is a RSC encoder. The reason is that the recursive encoder can improve bit BER performance of code. Turbo Code The turbo code used in the 3GPP LTE protocol is a parallel cascaded code with a 1/3-bit rate, and its encoder consists of two RSC encoders with the same code rate of 1/2 and a interleaving, as shown in Figure 2. Since recursive convolutional codes produce more code weight than non recursive convolutio