QoS Class Identifier (QCI)

The need for supporting a broader variety of applications requiring higher bandwidth and lower latency led 3GPP to alleviate the existing QoS principles with the introduction for EPS of a QoS Class Identifier (QCI).
LTE provides different QoS for a given application by putting it into the different bearer . each bearer has its own QCI (QoS Class Identifier) which introduce a particular service for a particular application. as far as I know 9 different QCIs have been defined in LTE based on priority,packet loss and delay.

 

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The QoS architecture in EPC enables a number of important capabilities for both operators and users:

VoIP support with IMS: QoS is a crucial element for providing LTE/IMS voice service.
Enhanced application performance:Applications such as gaming or video can operate more reliably.
More flexible business models:With flexible, policy-based charging control, operators and third-parties will be able to offer content in creative new ways. For example, an enhanced video stream to a user could be paid for by an advertiser.
Congestion control: In congestion situations, certain traffic flows (e.g., bulk transfers, abusive users) can be throttled down to provide a better user experience for others.

VoLTE + Wi-Fi = LTE Femto

This week, Kineto announced it now supports the GSMA’s VoLTE profile (IMS voice & SMS) in its Smart Wi-Fi client. Smartphones with the Smart Wi-Fi client will now be able to receive the mobile operator’s voice/SMS service (VoLTE) when attached to Wi-Fi.
I have always believed LTE and Wi-Fi were two sides of the same coin – both are high-speed, low-latency flat IP networks. LTE covers the macro/outdoor world, and Wi-Fi is by far the dominant in-building wireless technology. Marrying the two technologies into a seamless experience delivers a compelling experience for mobile subscribers.
In the move to LTE, mobile operators are adopting VoLTE, an IMS/SIP-based voice and SMS profile that replaces (replicates?) the existing circuit voice/SMS services used in GSM/UMTS networks.

What are the functionality of eNodeB?

E-UTRAN consists solely of the evolved Node B (eNB), which is responsible for all radio interface functionality.

eNB is the RAN node in the EPS architecture that is responsible for radio transmission to and reception from UEs in one or more cells.
The eNB is connected to EPC nodes by means of an S1 interface.The eNB is also connected to its neighbor eNBs by means of the
X2 interface. Some significant changes have been made to the eNB functional allocation compared to UTRAN. Most Rel-6 RNC
functionality has been moved to the E-UTRAN eNB. Below follows a description of the functionality provided by eNB.

Good PDF Document on LTE Functionality

UMTS/HSPA to LTE Migration

UMTS/HSPA to LTE Migration- A white Paper from Motorola Maximize the life and value of existing assets while achieving a true 4G network

Download Full lenth Paper from Here

Contents
Abstract
- A Dynamic Industry and Technology Evolution
- LTE Performance
- UMTS " LTE Network Architecture Evolution
- Determine the Business Case for LTE
- Subscriber Device Availability
- Deployment Considerations
- Seamlessly Connected Network
- Spectrum Implications
- Maximize Existing Assets
- UMTS to LTE Upgrade Strategy
- UMTS/LTE Architecture
- Functional Elements
- UMTS / HSPA RAN Site Upgrade to LTE
- Backhaul Site Upgrade to LTE
- LTE Voice
- LTE Video

Download Full lenth Paper from Here