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What is RB or Resource Block? A Resource Block (RB) is a time- and frequency resource that occupies 12 subcarriers (12x15 kHz = 180 kHz) and...

What is a resource block

What is RB or Resource Block?

A Resource Block (RB) is a time- and frequency resource
that occupies 12 subcarriers (12x15 kHz = 180 kHz) and one slot (=0.5 ms).

RBs are allocated in pairs by the scheduler (then referred to as Scheduling Blocks).

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Each OFDM symbol contains, if 64-QAM is used, 6 bits per subcarrier (15kHz). There are, if normal CP is used, 7 OFDM symbols per slot. This ...

Calculate the maximum theoretical physical peak data rate in LTE radio interface

Each OFDM symbol contains, if 64-QAM is used, 6 bits per subcarrier (15kHz). There are, if normal CP is used, 7 OFDM symbols per slot. This ends up with 6*7 = 42 bits per slot.

One slot is 0.5 ms which gives us 42/0.5ms = 84kbps per sub-carrier.
If the full bandwidth, 20MHz, is used, there are
20MHz/15kHz=1333 sub-carriers.

However, only 1200 of these are used for user data. This
corresponds to 100 resource blocks.

1200*84kbps = 100,8 Mbps.
With four MIMO layers, we should be able to achieve 403,2 Mbps
of raw data rate in the physical layer.
What about the user data rate? The data rates used for L1/L2
signaling, reference signals, PBCH, SCH, layer 3 signaling and protocol headers has to be subtracted from this figure.

Then we end up with approximately 320 Mbps of user data rate on RLC level??
In UL we have approximately the same calculation, except that the gain from MIMO cannot be included, since no SU-MIMO is used in UL. Hence, approximately 80-100 Mbps of theoretical bitrate should be possible to reach.

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Self-Healing Self-healing is a function that mitigates the faults automatically by triggering appropriate recovery actions. From the point o...

LTE SON on Self-Healing

Self-Healing

Self-healing is a function that mitigates the faults automatically by triggering appropriate recovery
actions.

From the point of view of fault management, for each detected fault appropriate alarms are be generated by the faulty network entity, regardless of whether it is an automatically detected and automatically cleared fault, or an automatically detected and manually cleared fault.

The self-healing functionality monitors the alarms, and gathers necessary correlated information (e.g. measurements, testing result, etc.) and does deep analysis, and triggers appropriate recovery actions to solve the fault.

It also monitors the execution of the recovery actions and decides the next step accordingly. When self-healing iteration ends, the self-healing functionality generates
appropriate notifications to inform the Integration Reference Point (IRP) Manager of all the changes
performed.

This concludes the section on the new radio access network for LTE, and the following chapters cover the new Core Network entities required to support this new technology.

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Self-Optimization Based on the actual location of equipment, the optimization of the initial neighbour list is required, (e.g. radio measu...

LTE SON on Self-Optimization

Self-Optimization

Based on the actual location of equipment, the optimization of the initial neighbour list is required,
(e.g. radio measurements of eNodeBs are required to solve the call drops or handover problems).

For this approach, RRC connections and their accompanying measurements can be used to gather
the needed information about their neighbours.

Known neighbours can be checked if they are really
appropriate concerning real RF conditions; new ones can be included based on information about detected cells in the UEs. Neighbour related parameters include:

Location of the neighbours (distance)

UE measurement reporting or eNodeB radio scanning for neighbours

Field strength information

Event measurements such as cell specific call drops or handover failures

Network Management System(EMS)/Element Management

System(NMS) configuration data

Planning tool data

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Self-Configuration Self-configuration is the process that is executed automatically after the physical installation of the eNB. An IP addres...

LTE SON on Self-Configuration

Self-Configuration

Self-configuration is the process that is executed automatically after the physical installation of the
eNB.

An IP address is allocated to the new eNB.

The eNB connects to the OAM system for authentication, software download and configuration data download. The initial radio configuration and transport parameters configuration are completed, and the software is downloaded into the eNB.

The eNB connects to the OAM system for configuration data or normal network management.

The S1-links and X2-links are established and dependent nodes such as MMEs and eNBs are updated with new configuration data.

The inventory system in the OAM is informed that a new eNB is ready to perform the next required operation.

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LTE MIMO MIMO, (Multiple-input and Multiple-output), refers to the use of multiple antennas at both the transmitter and receiver to improve ...

What is MIMO in LTE

LTE MIMO

MIMO, (Multiple-input and Multiple-output), refers to the use of multiple antennas at both the
transmitter and receiver to improve communication performance. It is one of several forms of smart
antenna technology.

MIMO offers significant increases in data throughput and link range without additional bandwidth or
transmit power. This is achieved due to a higher spectral efficiency, (more bits per second per hertz
of bandwidth), and link reliability or diversity (reduced fading).

LTE supports Multi-Mode Adaptive MIMO for Downlink and Uplink, which accommodates both higher
data rate and wider coverage:

Single User MIMO for peak user data rate improvement.

Multi User MIMO for average data rate enhancement.

Collaborative/Network MIMO for cell edge user data rate boost.

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Self Organizing Network - SON SON in LTE SON is a certain set of features defined as use cases in 3GPP and applied for LTE. The feature sets...

What is SON

Self Organizing Network - SON

SON in LTE

SON is a certain set of features defined as use cases in 3GPP and applied for LTE.

The feature sets, dependent on 3GPP releases (e.g. 8 or 9) are expected to benefit Operators by transforming possible network management operations into automatic executable software procedures, hence resulting in substantial savings in OPEX.

Automation is not a new concept for wireless networks, although with LTE this will prove to be more efficient, enabling the extensive use of automated processes. Thus, the appearance of SON algorithms represents a continuation of the natural evolution of wireless networks, where automated processes are simply extending their scope deeper
into the network.

SON features are distributed to eNB and EPC, and include Self Configuration, Self Optimization and
Self Healing features.

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LTE stands for Long Term Evolution.LTE is a standard for 4th generation (4G) mobile broadband which is aimed to be the successor to the 3...

What is LTE

LTE stands for Long Term Evolution.LTE is a standard for 4th generation (4G) mobile broadband which is aimed to be the successor to the 3G technologies GSM/UMTS.

LTE is already implemented in many countries but still in the early stage.

LTE is also considered the competitor to WiMAX.

LTE promises to provide theoretical peak download rates of up 100Mbps (rates with varies based on environment etc) and peak upload rates of up to 50Mbps.

LTE is a better technology than wimax becauste LTE will make people free from the burden of having to find a WiFi hotspot (Wimax) when they are on the road.

As long as you have an LTE modem, LTE subscribers can connect to the internet anywhere in the service provider's coverage area!

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Download Ericsson LTE Perspective in PDF

Ericsson LTE Perspective

Download Ericsson LTE Perspective in PDF

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LTE vs 3G Demo

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Speedtest - LTE Vodafone

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Speedtest - LTE Deutsche Telekom

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LTE - drive test results

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What is LTE with a simple term (cartoon version)

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LTE Overview

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