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| Excerpt from the paper: "Voice over LTE via Generic Access
Network, or VoLGA for short, which is defined by the VoLGA forum2. Here, the
concept is to connect the already existing Mobile Switching Centers to the LTE
network via a gateway. As no fallback to a legacy network is required, call
setup times are not increased and the user's quality of experience is consistent
with that of the 2G or 3G voice environment. VoLGA is based on the existing 3GPP Generic Access Network (GAN) standard, which is deployed for example by T-Mobile in the US and Orange in France. The purpose of GAN is to extend mobile services over a generic IP access network. One of the popular applications of GAN is with Wi-Fi-enabled phones. With GAN-based dual-mode mobile phones, all services are either available over their GSM networks as usual, or over Wi-Fi at home or in public places. Moving between the two network technologies is fully transparent to the user." |
This paper from Ericsson covers the following topics:
| This article provides an overview of the LTE radio interface, recently approved by the 3GPP, together with a more in-depth description of its features such as spectrum flexibility, multi-antenna transmission, and inter-cell interference control. The performance of LTE and some of its key features is illustrated with simulation results. The article is concluded with an outlook into the future evolution of LTE. |
| The LTE radio interface for 3GPP Release 8 was specified recently. This article describes the LTE link-layer protocols, which abstract the physical layer and adapt its characteristics to match the requirements of higher layer protocols.The LTE link-layer protocols are optimized for low delay and low overhead and are simpler than their counterparts in UTRAN. The state -of-the-art LTE protocol design is the result of a careful crosslayer approach where the protocols interact with each other efficiently. This article provides a thorough overview of this protocol stack, including the sub-layers and corresponding interactions in between them, in a manner that is more intuitive than in the respective 3GPP specifications. |
The special issue on LTE and LTE advanced contains
articles covering the following topics:
Note: The website also contains a link for downloading the PDF containing the entire special issue. |
This article from Freescale provides an excellent introduction to the LTE physical layer. The topics covered are:
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| This paper provides an introduction to how the LTE protocol stack operates. Because the final 3GPP specification will cover tens of thousands of pages, this paper touches only on the highest levels of protocol operation. The paper discusses the history and application requirements that determine the functions and priorities of LTE, examines the protocol stack in terms of the time domain and in terms of information moving through the stack, and finally discusses more specialized aspects of the standard such as scheduling and quality of service, management and control functions, handovers and power save operation. | |
Thesis covers a proof of concept LTE system. User
plane handling is covered in detail. The following topics are covered:
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| This article from Ericsson presents some of the key
features of the radio interface for LTE (long-term evolution), recently approved
by 3GPP. LTE enables unprecedented performance in terms of peak data rates,
delay, and spectrum efficiency. The authors discuss spectrum flexibility, multi-antenna technologies, scheduling, link adaptation, power control, and retransmission handling. |
| This article from Motorola talks about current and future spectrum allocations for LTE. Potential redeployment of GSM and other legacy services are also covered. |
Motorola gives an overview of the LTE air interface in this article. The main areas covered are:
This article from Motorola provides a good overview of LTE. The following are covered:
A technical presentation about LTE.
A presentation describing the MAC Sub-Layer of LTE. The following topics are covered:
A presentation describing the Radio Link Control (RLC) Sub-Layer of LTE. The following topics are covered:
A presentation describing the Packet Data Convergence Protocol (PDCP) Sub-Layer of LTE. The following topics are covered:
Analysis of different radio resource management and frequency reuse techniques in LTE.
In this paper, three scheduling schemes are evaluated in different scenarios for SC-FDMA used in LTE uplink, First maximum expansion and recursive maximum expansion are powerful in terms of gain over round robin but suffers from poor fairness results, Search-Tree Based Algorithm guarantees same amount of bandwidth for each user and yet improve the performance by factor 0.5 up to 1.2. Search-Tree Based allows adaptive computational complexity by introducing variable number of best branches to be stored in the search procedure..
| Majority of the world's operators and vendors are already committed to LTE deployments and developments, making LTE the market leader in the upcoming evolution to 4G wireless communication systems. Multiple input multiple output (MIMO) technologies introduced in LTE such as spatial multiplexing, transmit diversity, and beamforming are key components for providing higher peak rate at a better system efficiency, which are essential for supporting future broadband data service over wireless links. |
| For over a decade universities and wireless research
labs have been combining multiple antenna transmission techniques with advanced signal processing algorithms to create what is sometimes called smart-antenna and is also known as multi-input multi-output (MIMO) technology. These schemes are now moving into mainstream communication systems. Indeed, MIMO technologies can already be found in wireless local area network access points (e.g. 802.11n based solutions). This has led to MIMO being standardized in WiMAX as well as in 3GPP Rel-6 and Rel-7 of the UTRAN (HSPA) specifications. Further, Rel-8 of the E-UTRAN (LTE) 3GPP specifications, completed in March 2009, included the most advanced forms of MIMO in any standard in the industry. And even more advanced MIMO enhancements are currently being studied for inclusion in 3GPP Rel-9 and Rel-10. |
Presentation from Ericsson describing the evolution of the LTE Core Network.
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