lte book

Recently, there are a lot of topics on TD-SCDMA. The point of view is to support and oppose the two factions, and to settle the historical scores. Personally, TD-SCDMA itself is indeed a failure, at least the masses of the eyes are discerning. But also can not completely negate the credit of TD-SCDMA, it is not the key to td-lte development and growth, not to say, but at least for Td-lte laid a foundation.

With the division of spectrum resources, a huge rock in the road of TD-LTE commercialization was moved. At the recently held "TD-LTE technology and spectrum Seminar", China's 2.6GHz spectrum planning scheme was announced,-2690hz of the 2.6GHz band all divided into TDD spectrum. The determination of spectrum division, which sent a clear signal to the TD-LTE indust

LTE user documentation(if there are inappropriate places, please correct me!) )evolved Packet Core (EPC)we now explain how to write a simulation program that allows simulation of the EPC in addition to the LTE Wireless access network. The EPC allows the use of IPV4 networks to connect to LTE devices. In other words, conventional ns-3 applications and IPV4 sockets

Chang gang, Ericsson China's chief market officer, said that during the construction of TD-LTE, D + F hybrid networking will be the final network form. He further stressed that for the construction of F band, F band new than the TD-SCDMA upgrade in performance, optimization and maintenance, there is no significant difference in the construction progress and investment benefits. D-band is superior to F-band upgrade According to the news, China Mobile i

Extended LTE network For Network developers, you only need to pay a little attention to the current situation of 4G/LTE communication needs, and you will be able to understand the future development trend. According to recent forecasts, mobile data traffic will increase by 11 times by 2018. More than half of the 190 EB data flowing through the wireless network will be transmitted through the 4G/

In the Last Post, "LTE Physical Transmission Resources (3)-time-frequency resources," the final mention of Pcfich and other downstream physical channels, this blog post originally wanted to write Pcfich channel, but in preparation for writing Pcfich, found the need to use the antenna port related content, and these content is not yet written. So this paper first write the antenna port and downlink reference signal related content.1. Relationship of an

At present, LTE access bearer network is not widely used, but there are still many problems. So I have studied the development status and problems of the LTE access bearer network. I will share with you here, hoping it will be useful to you. From 2G/3G to LTE access bearer network, more than 90% of wireless site addresses will be reused, and 2G/3G will coexist wi

After writing the previous blog, "LTE cell search-Physical cell ID and synchronization signal PSS, SSS," I would like to continue to write system information related content, but found to write the time necessary to involve PDCCH, Phich and other content, and these content has not been systematically written. So the next few posts will write some of the LTE background knowledge that needs to be mastered.Thi

1. Frequency band (Band)The so-called frequency band , refers to the wireless decoder in the specified degree of distortion and rated output power of the operating band width, refers to a frequency range or the width of the spectrum , that is, the minimum operating frequency of the wireless decoder to the maximum operating frequency range, The unit is Hz. For convenience, in LTE, a digital 1-43 is used to denote different bands (36101-v10.21.0 version

What does VoWi-Fi bring to the voice communication experience in the LTE age? In the Internet era, users have high requirements on business experience, including voice services. To some extent, this can be explained that compared with the global LTE construction climax, the VoLTE business is growing more slowly. As the first telecom-level public voice service, VoLTE puts forward high requirements on the op

In tdd lte, upper and lower lines are not necessarily symmetric. When the number of downstream sub-frames is higher than that of the upstream sub-frames, the harq of multiple downstream sub-frames is reported in one upstream sub-frame. The number of harq records reported in an uplink sub-frame depends on the configuration of the LTE uplink and downlink MIMO modes. Through upper layer configuration,

Cat. That is ue-category, according to the definition of 3GPP, ue-category is divided into 1~10 a total of 10 levels, of which cat.1-5 is R8 definition, cat.6-8 is R10 definition, cat.9-10 is R11 definition. As shown above, ue-category mainly defines the upper and lower line rates that the UE terminal can support. The cat.0 is an LTE terminal grade that is written to the 3GPP rel.12 Standard and supports a lower-rate, lower-power version. cat.0 and

China Mobile Shanghai company plans to launch TD-LTE trial for commercial use in the first half of next year. On June 28, at the fifth session of the Shanghai Communications Development Conference, Mao weiliang, deputy general manager of the data business department of China Mobile Shanghai Company, revealed that in the second half of this year, TD-LTE terminal only data card, wait until the first half of

to technical system lags behind, weak data bandwidth capabilities, and poor mobility, it is difficult to meet the development requirements of industry private networks. To help private network users solve the above problems, narrowband Digital cluster technology has clearly evolved to a broadband multimedia Cluster Based on LTE, the TD-LTE-based broadband multimedia digital cluster solution is favored by u

Before reading this article, it is recommended to take a look at the post "LTE-TDD HARQ (1)-upstream HARQ timing" to better understand the content of this article.The main contents of this article include:(1) What is the Phich channel and what is its role?(2) How to uniquely identify a Phich channel(3) What is the content of the Phich channel corresponding to the reg actual mapping?(4) Location of the Phich channel1. What is the Phich channelPHICH Cha

points of the sub-carrier overlay becomes SC-FDMA symbol, because the modulation is done in the time domain, so the uplink of a UE data can be regarded as a single carrier,So called SC-FDMA. A SC-FDMA symbol corresponds to the 12*NRB sub-carrier, and a time slot consists of 7 SC-FDMA symbols.4. For example, this re, which is assumed to be re (2,3), represents the third Sc-fmda symbolic symbol of the 2nd sub-carrier on the time domain. What this symbol is. is a waveform of physical space transfe

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,

Question 16: Time Synchronization 1.Wireless Link Quality Detection To ensure the correct transmission of downstream signaling and data, the UE side needs to check the downlink quality after the cell search is complete to ensure that the downlink signaling and data are correctly received, the UE implements uplink synchronization with the base station through the random access process. After that, the base station continuously sends timed adjustment commands to the UE to maintain uplink synchroni

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