This page describes LTE Signalling Radio Bearer types which include LTE SRB0, SRB1 and SRB2. LTE Signalling radio
bearers(SRB) are used for the transfer of RRC and NAS signalling messages.
RRC messages are used as signalling between UE and eNodeB.
EDGE MCS Coding Schemes
- a summary, overview or tutorial about the basics of the GSM EDGE data
coding and error correction and MCS classes.
GSM EDGE TUTORIAL INCLUDES:
GSM EDGE technology
EDGE network architecture
Modulation, slot, & burst
EDGE MCS c
Home > IMS VoLTE Architecture
IMS VoLTE Architecture
The idea of IMS is old but after its deployment with LTE users and operators can harness the true power of IMS. IMS (IP Multimedia Subsystem) is a
standalone system which resides out of the LTE network
Physical Cell Id (PCI) : The PCI is combination of two synchronization signals
PSS ( primary synchronization signals, PCI- ID )
SSS ( Secondary synchronization signals , PCI- group)
There are 504 different PCI's in LTE.
How the planning can be done
HSDPA Packet scheduler algorithms
The goal of the HSDPA scheduler is to maximize the spectrum efficiency of the cell while
maintaining the QoS requirements for different data services.
HSDPA scheduler resides in the NodeB. It is a fast scheduler which can
LTE Frame and Subframe Structure
- information, overview, or tutorial about the LTE frame and subframe
structure including LTE Type 1 and LTE Type 2 frames.
IN THIS SECTION
OFDM, OFDMA, SC-FDMA
TDD & FDD
Frame & subframe
OFDM signals have a higher
OFDMi signals have a higher peak-to-average ratio (PAR)often called a peak-to-average
power ratio (PAPRi)than single-carrier signals do. The reason is that in the time domain, a
multicarrier signal is the sum of many narrowband
LTE Quick Reference
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PHICH stands for Physical channel HybridARQ Indicator Channel. Simply put, it is a secially designed downlink only
channel which carries ACK or NACK for the PUSCH received
E-DCH and E-TFCI
The uplink enhanced dedicated channel (E-DCH) is a transport channel between L2 and L1.
The attributes of the E-DCH transport channel are:
Transport Block Size. The transport block is the basic unit exchanged between L1 and
MAC. E-DCH tra
NANDUS ROUGH GUIDES
Rough Guide to 3G and HSPA
An Effort to Understand the Complexities of 3G/HSPA
This rough guide is an effort to help RF engineers who are interested in learning the basi
Fast Dormancy (UMTS state switching on the air interface)
Traditional Fast Dormancy
This technology was introduced to 3G UMTS to save the current consumption of the
device by switching between different mobile device activities states on the air
Random Access Procedure in LTE
When you switch on smartphone for the very first time, it will start searching for the network. There is a possibility that there are many
networks or to put in other words , there are many frequencies from differ
What is CQI PMI RI in LTE?
Well, we had discussed about uplink channel state information Difference between SRS and
DMRS by reference signals (SRS and DMRS). Now to achieve 1Gbps or more downlink
speed in LTE with effective resource utilization of full ba
Scheduling Request Procedure
The Scheduling Request (SR) is used for requesting UL-SCH resources for new transmission.
UEs MAC triggers scheduling request when a regular BSR is triggered and UE doesnt have uplink
resources for transmission of at least the