1, ENB antenna arrival angle (LTESCAOA) beyond the normal rangeIn the OMC-R measurement reporting technical requirements, this field is defined as:"Defines the estimated angle of a user's relative reference direction. The measurement reference direction should be true north, counterclockwise. can assist to determine the location of the user, providing location services, accuracy of 5 degrees. This measurement data represents the number of samples that meet the range of criteria in the omc-r stat
LTE user documentation(if there are inappropriate places, please correct me!) )Configure UE MeasurementsThe user measurement configuration activated in the simulation depends on the selected "Consumers", such as the switching algorithm. Users may need to add their own configurations in the following ways:
Directly configured in the base station RRC entity;
Configure the existing switching algorithm;
A new switching algorithm is develo
In view of the previous day to write a relevant knowledge point, and occasionally due to work reasons, did not follow up every day, so decided to write today another on the key technology of LTE knowledge, but also the last son.SON: (self organized network) ad-organized networks ;Contains three aspects: self-configuring, ANR (Automatic neighborhood optimization), MRO (switching self-optimizing);Automatic configuration is the base station cell equipmen
The LTE network has several key technologies, namely: Ofdm,amc,harq,mimo,icic,sonToday first to understand OFDM; (orthogonal Frequency Division multiplexing) Orthogonal frequency Division MultiplexingThe channel is divided into multiple orthogonal sub-channels, the high-speed data signal is converted into parallel low-speed sub-data stream, and modulated to each sub-channel for transmission.Orthogonal Frequency Division Multiplexing (OFDM) system is a
Tingfang Ji (Qualcomm), etc, "cell association and interference coordination in heterogeneous LTE-A cellular networks", jsac 2010.
Background:
Heterogeneous LTE Networks: Macro base station + femto Base Station
In macro-only cellular network, macro base stations have the same transmit power, terminal is connected to the macro Base Station with the strongest power
In heterogeneous network, terminals are
Key LTE technologies for wireless communication network learning ICIC (20141220), lteicic
ICIC: Inter Cell Interference Coordination, Inter-Cell Interference Coordination technology.
Cell interference is a key indicator that limits cell network cell throughput, especially for cell edge users. Because the Frequency Multiplexing factor supported by the LTE system is 1, meticulous management of inter-cell inte
Since 2008, Red Bend has partnered with Alcatel-Lucent to help device manufacturers and mobile network operators deliver mobile devices and services to the market faster and more easily. Using the OMA DM client on 4G LTE devices, device manufacturers can ensure that their devices are seamlessly compatible with the operator's Custom open Mobile Alliance Device Management (OMA DM) specification.
"Industry standards like OMA DM enable mobile operators to
).
The number of RB is correlated with the bandwidth of the frequency, with a bandwidth of 20MHz of 100 Rb,10mhz with 50 RB. P.sThe long-term evolution of the EPS:UMTS and the evolution of the system structure mentioned in the book that RB can contain 25 sub-carriers. Later checked, roughly on the R7 when the evaluation of the use of 25 sub-carriers, and then unified to 12, and GSM approach.
In the 3GPP LTE and LT
Summary:
Core platform of 3GPP, http://www.3gpp.org/ftp/Specs/html-info/23228.htm
First released by 3GPP Release 5, in order to enhance packet-switched domain (UMTS) in supporting IP multimedia services.
Providing back compatibility to circuit-switched domains and functionality to other IMs domains.
Nowadays, IMS provides access to Internet services (e.g. email, VoIP, video, etc) overdifferent networks (3g, cable TV, WLAN, XDSL, LTE, etc ). the
srb2 is also contained in RRC messages, but these NAS messages do not include any RRC Protocol control information, but are only included in RRC when RRC messages are transmitted, RRC is a carrier.
Once the security mode is activated, all RRC messages (including some NAS or 3GPP messages) of srb1 and srb2 are protected and encrypted through PDCP, NAS only protects and encrypts the integrity of NAS messages. In other words, layer-2 encryption and Protection of
of the default css.css can also be compatible with other non-IE browser implementations.Note: The default CSS style should be in the first line of the HTML document, and all content judged by the conditional comment must be behind the default style.For example, the following code, in IE, the execution of the display as red, and in non-IE browser display as black. If the conditional annotation is judged on the first line, it cannot be implemented. This example can explain the compatibility probl
IE6 and the following versions are visibleIE7 and the following versions are visibleOnly IE6 versions are visibleIn addition to IE versionIE8 The following version is visibleIE7 and larger than IE7 versions are visibleUsage:(1)You can use the following code to detect the version of the current IE browser (note: No effect is visible in non IE browsers)If the current browser is IE, but the version is lower than IE5, how to do it, you can use LTE: Is the
: ...--schedulinginfolist: Period and its corresponding SIB type--si-windowlength-- Systeminfovaluetag Note: An SI can contain multiple sib, and multiple si have a common si window length; SIB2 content: Common channel configuration, upstream carrier frequency, bandwidth, Radio Resource, MBSFN (multimedia Broadcast Multicast Services single frequency network), Rach required information SIB3 ... SIB12: Public resources and re-election of various information;
Second, the system message acquisition
calculation of MCS, modulation order, encoding rate, spectral efficiency relationship table
Reference URL: http://4g-lte-world.blogspot.tw/2012/12/transport-block-size-code-rate-protocol.html
Reference URL: http://blog.richliu.com/2013/10/22/1545/
(1) Premises:
Therefore, the efficiency can be simplified to the following formula:
tbs= size of the transfer block (table 7.1.7.2.1-1)
crc= the number of bits that are attached for error checking =24
Buffer Status Report (BSR)
When introducing Sr, we know that the resources required for uplink data transmission are obtained through BSR, the buffer status report process is used to provide the service ENB with information about how much data
Ref: E-UTRA_Physical layer procedures_3gpp ts 36.213-v9.2.0 (2010)
Summary of CQI learning:
1. Channel quality indication (CQI) report format:
2. There are two types of CQI reports: periodic and aperiodic.
Periodic CQI report is transmitted by
Note: Information interactions listed in the following table, including all information related to ENB (UE ENB EPC)
MSG name
Entities
Comment
S1 SETUP Request
ENB-> NW
S1ap setup
S1 setup response
NW->
Note: DCI (downlinkcontrolinformation) downlink control information
Transferred from: http://blog.sina.com.cn/s/blog_927cff010101epjc.html
about downlink Harq
Downlink Harq using asynchronous (asynchronous), adaptive (adaptive) means that the
Speaking of LTE, we immediately think of the 4G, and when it comes to 4G, many people in the mind is TDD LTE, because our first 4G license is TDD LTE, currently is TDD LTE, operators mainly for China Mobile's dominant. However, with the FDD LTE license soon to be released, C
Currently, traffic revenue is growing rapidly, accounting for about half of the operator's revenue. However, traditional voice communication revenue is still the focus of operators. However, in the 2G or 3G era, there is no obstacle in the 4G era.
Complicated VoIP implementation, multiple solutions help LTE transition
LTE is a full-IP network, and its network architecture can implement VoIP communication. H
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