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LTE Home LTE Intro Data rates CAR of 4G SL Mobility EPC Arch Interfaces LTE Cells Multi Antenna Access Tech LTE Frame Alt Frame PHY Layer LTE vs. CDMA LTE or WiMax LTE VOIP
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LTE (Long Term Evolution)

Detailed LTE introduction can be referred from this link.

In brief LTE is a fourth generation (4G) wireless standard for broadband mobile technology. This standard is developed to meet long term future requirements of higher data rates, lower latency, better cell coverage and seamless handover.
mVoIP in 4G LTE or simply 4G LTE voip .

First of all there is no direct/out of box support for voice and SMS in LTE standard. This brings a requirement of back door options to support VoIP LTE. Some of  those options are discussed below.

Option 1: Fallback to 2G or 3G for Voice to achieve voip
Like the name suggest drop the 4G network and go back to 2G/3G network. There are some problems with this method. Biggest is longer call setup times  due to fall back and results in low QoS. Also requires software upgrades on Mobile Switching Centers (MSCs).

Option 2: Use of IMS
This seems like one of the possible solutions for mid to long term. In this option, network operator based voice services is integrated with the LTE IP Multimedia Subsystem (IMS). Obviously this is a complex system and will require long time to implement.
4G LTE and mobile VoIP discussion.
Introduction of 4G LTE and mobile VoIP followed by LTE  and mobile VoIP discussion.   
mVoIP or Mobile Voice over Internet Protocol networks.

mVoIP is extension of VoIP for mobile devices. Current wireless networks are capable of sending/receiving packets over the RF links in order of Mega bits per second or Mbps. With these rates voice calls can easily be converted into data packets and sent over the air along with multi-media packets.

mVoIP can be implemented in a local area with LAN setup or can be used with 3G/4G wireless networks.

Next we will discuss the methodology to integrate a 4G LTE mobile handset with a VoIP network.     
Evolved Packet Core (EPC) system architecture for all IP.Mobility Management Entity (MME),
Serving System (S) Architecture (A) Evolution (E) Gateway or Serving Gateway SGW.
Packet Data Network (PDN) SAE Gateway
Enhanced Packet Data Gateway (ePDG)
Multiple antenna techniques - MIMO, Adaptive antenna systems - AAS and Antenna diversity - AD
Cloud Computing ?
Whenever a document or photo is uploaded on the web, a thread of cloud computing is active. Learn more from here.
Option 3: VoLGA - Voice over LTE via Generic Access or VoLGA

Third option is to connect already existing Mobile Switching Centers to the LTE network via a gateway. VoLGA is based on the existing 3GPP Generic Access Network (GAN) standard. Using this option in existing networks saves extra call setup times and gives a better QoS.