The Infona portal uses cookies, i.e. strings of text saved by a browser on the user's device. The portal can access those files and use them to remember the user's data, such as their chosen settings (screen view, interface language, etc.), or their login data. By using the Infona portal the user accepts automatic saving and using this information for portal operation purposes. More information on the subject can be found in the Privacy Policy and Terms of Service. By closing this window the user confirms that they have read the information on cookie usage, and they accept the privacy policy and the way cookies are used by the portal. You can change the cookie settings in your browser.
Wireless spectrum being a valuable resource, a large number of both non-profit and for-profit users rely on its unlicensed parts, usually to provide some sort of local area wireless coverage. When the cellular vendors and service providers expressed interest in the unlicensed spectrum, the incumbent community started to fear that the new technology would not respect the existing users. And although...
Licensed-Assisted Access (LAA) which allows LTE to be deployed in unlicensed spectrum is a promising technique currently under standardization in 3GPP Rel-13. To guarantee a peaceful coexistence of LAA with the incumbent systems such as WiFi, listen-before-talk (LBT) which requires the node to sense the medium before data transmission is introduced. On the other hand, LBT also prevents simultaneous...
This paper examines an LTE Release 12 discovery signal design and proposes various enhancements for current measurement definitions to more accurately capture the interference level of a frequency layer performing discontinuous transmission (DTX). We evaluated accuracy of the proposed layer selection metric by link-level tools, showed system-level evaluations for a system using a small cell ON/OFF...
In this paper we present the evolution of downlink multi-antenna techniques over different releases of E-UTRAN LTE specifications. First we walk through the design of MIMO transmission schemes, reference signals and channel state information feedback from Release 8 to the latest Release 10 of the specifications. We provide extensive system simulation results for downlink single- and multi-user MIMO,...
This chapter contains sections titled:
Introduction
VoIP Codecs
VoIP Requirements
Delay Budget
Scheduling and Control Channels
LTE Voice Capacity
Voice Capacity Evolution
Uplink Coverage
Circuit Switched Fallback for LTE
Single Radio Voice Call Continuity (SR‐VCC)
Summary
References
Set the date range to filter the displayed results. You can set a starting date, ending date or both. You can enter the dates manually or choose them from the calendar.