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.
This work presents two-rank (Wi-Fi and LTE) analytical model, from which we can evaluate the goodput of vehicular wireless network depending on the number of vehicles N in the access point (AP) coverage area. To evaluate the suitability of the model used, experimental data are compared with the theoretically calculated data. The results obtained allow us to evaluate the performance of each individual...
Leveraging multi-path transmission in an energy-efficient manner is of great importance for mobile devices in heterogeneous wireless networks. Recently, Multi-Path TCP (MPTCP) has been introduced as a potential solution that could leverage this path diversity, but making it energy efficient not only depends on the end-user's observed interface capacity but also on the other competitors' decision....
One of the promising enhanced features introduced in LTE-Advanced is relaying. Coverage extensions as well as enhanced throughput gain are attractive from the perspective of network operators. While functioning in the macro-overlaid network, relay offers the flexibility of random deployment (nomadic relay) at places where the communication link is congested due to an occasional event (e.g. festival)...
Recently, the 3rd Generation Partnership Project (3GPP) has standardized LTE-licensed assisted access (LTE-LAA) supporting LTE downlink carrier aggregation (CA) in the 5 GHz unlicensed spectrum. LTE-LAA technology allows LTE operators to freely use additional frequency resources in the 5 GHz unlicensed spectrum. Therefore, the problem of coexistence with other existing communication technologies in...
In wireless network system the resources are limited. Therefore, managing resources is considered as a challenging task. The resource are distributed among attached UEs, so allocating resources needs to be well controlled. Packet scheduler in LTE network is responsible for assigning resources to attached UEs. Also, femtocell network is considered as promising solution for poor channel in indoor environment...
In this paper, we consider how to achieve optimum throughput when LTE with listen before talk (LBT) shares the unlicensed spectrum with WiFi. Basically, we aim to address two problems: 1) How can WiFi access point (AP) and WiFi station (STN) configure the access parameters to maximize the throughput of their own networks when they have knowledge of the access parameter of LTE? 2) How to jointly tune...
Dual Connectivity(DC) is one of the key technologies standardized in Release 12 of the 3GPP specifications for the Long Term Evolution (LTE) network. It attempts to increase the per-user throughput by allowing the user equipment (UE) to maintain connections with the MeNB (master eNB) and SeNB (secondary eNB) simultaneously, which are inter-connected via non-ideal backhaul. In this paper, we focus...
The existing Private/Professional Mobile Radio (PMR) technologies designed specifically for Mission Critical Communication (MCC) systems are narrowband and wideband devices, with limited network data capacity in emergency scenarios. They are majorly used to support MCC voice communications and low data rate applications during mission critical operations. However, the need for broadband systems that...
Extending LTE to unlicensed bands (LTE-U) is gaining increasing interest recently. However, its success faces great challenges due to the inherent lack of compatibility between LTE and Wi-Fi. In this paper, we address the problem of harmonious coexistence and efficient spectrum sharing for LTE-U and Wi-Fi. We develop an analysis framework for the Carrier Sensing Adaptive Transmission (CSAT) mechanism,...
The LTE system that traditionally uses the licensed band have added the new technology, licensed assisted access (LAA), that enables to use 5 GHz unlicensed band with existing licensed band. Coexistence with Wi-Fi is major part of the LAA technology and regulations relating to coexistence has been revised after LAA technology emerged in Europe. Channel occupancy time (COT) is a critical parameter...
The fifth generation (5G) ultra dense network (UDN) is envisioned as a very dense deployment of low power base stations where heterogeneous radio access technologies are used to satisfy the data rate demand of users employing both licensed and unlicensed spectrum. In UDN scenario, conditions of the channels operating in licensed band may exhibit intermittent characteristics due to the varying level...
4G Long Term Evolution (LTE) mobile system adopts Adaptive Modulation and Coding (AMC) as a link adaption mechanism that is based on the User Equipment (UE) periodically reporting channel condition summarised through Channel Quality Indicator (CQI) which, in turn, is based on Signal-to-Interference-plus-Noise Ratio (SINR) and Reference Signal Received Power (RSRP). Although CQI has a predominant role...
The aim of this paper is to introduce the measurement method for challenging Non-Line of Sight (NLOS) conditions in mobile networks. The need to develop the measurement method appeared LTE (Long Term Evolution) uplink (UL) performance with different antenna technologies when receiving NLOS signal in field tests. Many challenges appeared during the study. This paper introduces the challenges and presents...
Management of Interference Is the solution designing for LTE network to reduce inter symbol interference (ISI) and intercell interference (ICI) using the frequency reuse schemes which has the objective to maximize the coverage area and provide more capacity in cells, especially in cell edge. Based on those propositions, this paper analyzes the process of optimizing subcarrier and power allocation...
In this paper, we propose a new power allocation method on non-orthogonal multiple access (NOMA) schemes in cellular uplink network. It is known that NOMA could be a promising candidate as a wireless access scheme for future 5G radio access technology. To enhance the spectrum efficiency, NOMA adopts a successive interference cancellation (SIC) receiver as the baseline receiver scheme for robust multiple...
In March 2016, a new protocol called licensed-assisted access (LAA) has been embodied in Release 13 (Rel-13) for Long-Term Evolution (LTE) to operate on unlicensed spectrum and interwork with Wi-Fi. The relevant standards clarify the channel access procedures and contention window (CW) adjustment procedures for LAA. In a long period of time, the coexistence performance of LAA with other technologies,...
Contention-based transmission is a promising solution for small packet traffic in the fifth generation mobile networks (5G). Packet segmentation is applied to efficiently support diverse services with relative fixed transport block (TB) setting. The packet segmentation defined by LTE RLC Unac-knowledged Mode (UM) is used in the study. First, we determine the header overhead of the segmentation. Then...
In this work, decentralized coordinated scheduling in LTE-Advanced downlink networks is studied, where the base stations abstain from transmitting data on particular frequency/time resources in order to reduce the inter-cell interference experienced by users connected to neighboring base stations. The proposed decentralized scheme is derived with regard to low information exchange between the base...
Harmonious coexistence between LTE with Licensed-Assisted Access (LTE-LAA) and WIFI is a research issue due to deploying LTE to unlicensed spectrum 5GHz. Listen-before-talk (LBT) scheme works as a requisite in unlicensed spectrum to ensure the fairness among different radio access technologies (RATs). To reduce the collision caused by relatively fixed contention window (CW) of LBT scheme and ensure...
Due to the lack of spectrum resource of power wireless private network, it is difficult to guarantee the transmission for the services in the distribution network. In order to enhance the network resource utilization, this paper puts forward a method for the uplink resource scheduling of power wireless private network based on NB-IoT and LTE hybrid transmission. Firstly, through the cognizing for...
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.