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The deployment of LTE in unlicensed spectrum has recently been proposed to improve cellular data capacity. Under the title of License Assisted Access (LAA), 3GPP is developing a global standard to enable operators of licensed spectrum to expand into unlicensed spectrum. For regions with less restrictive regulations, the LTE-U Forum has developed a proprietary implementation based on LTE Release 12...
This paper exploits the fundamental connection between cell association and load in the sense of bits-per-joule energy efficiency. Users adopt a proposed energy- efficiency-based association reward function to associate with their base stations in a heterogeneous cellular network consisting of K independent Poisson point processes (PPPs) of base stations (BSs). We first investigate the cell association...
Long propagation delay in wireless local area networks (WLANs) such as long distance WLANs and WLANs with radio-over-fiber (RoF) technology increases frame collisions. In particular, when a conventional WLAN coexists with the WLAN with long delay, the propagation delay causes serious throughput degradation and unfairness between the uplink and the downlink in the WLAN with long delay. In this paper,...
This paper presents field experiments on the downlink throughput performance of a beam tracking proof-of-concept system targeting 5G millimeter wave radio access in the following typical small cell environments: a courtyard, lobby, and underground parking area. The majority of the area in the tested environments is Line-Of-Sight (LOS) with cell radii of less than 60 m. The results show that the maximum...
LTE is the next step of the broadband cellular technology evolution. It is referred as the fourth generation (4G) technology which offers better performance in throughput, latency, and spectral efficiency. It uses OFDM that is proven to combat inter-symbol-interference (ISI), multipath fading, and enabling scalable bandwidth allocation. Downlink LTE uses OFDM technology variation called OFDMA which...
The scheduling in LTE downlink channel is a key problem currently. The goal of many existing LTE scheduler is achieving the system highest performance, but the system fairness and delay of partial real-time service under limited bandwidth resources are not enough to be ensured sometimes. Therefore we design a multi-factor scheduling algorithm for the mixed business scenarios. Different from other...
Coordinated multi-point (CoMP) is an efficient technique to increase cell-edge coverage probability and throughput in cloud radio access network (C- RAN). In this paper, we develop a tractable framework to analytically evaluate the performance of two typical CoMP schemes, namely, zero-forcing beamforming(ZFBF) and non-coherent joint transmission (NC-JT). Using the stochastic geometry based approach,...
Nowadays, there is an increase in the use of real time applications in public locations through wireless networks. Enhanced Distributed Channel Access protocol was issued to support quality of service for the real time applications. It came to overcome the lack in Distributed Coordination Function protocol in order to support quality of service. In this paper, Markov chain model is designed to analyze...
This paper proposes throughput evaluation for LTE-Advanced network access in the particular service area employing carrier aggregation (CA) technique. From several kind of CA, we evaluate which one the best CA configuration in term of network throughput. 30 MHz aggregated bandwidth and two component carrier (CC) serve as a primary serving cell (PCell) and secondary serving cell (SCell) are used in...
This paper explain optimization technique used on HSPA+ network model in urban area, using HSPA service customer map in Bandung city and geographic data of Bandung city. Optimization technique involves antenna height change, antenna mechanical tilt change and reconfiguration of transmitter pilot power level. Optimization effect will be seen by measuring network coverage parameter (RSCPgood.area(%)...
In this paper, we present a new approach that seeks reducing the downlink TBS-index by the LTE-A eNodeB. Our objective is to minimize the total transmitted power based on getting the benefit from available but unused PRBs, while considering the QoS for the UEs and mitigating the interference from adjecent eNodeBs. Most previous studies have not assigned the residual PRBs in the eNodeB to change the...
Although downlink multi-user MIMO (MU-MIMO) technology is included in the IEEE 802.11ac Standard, multi-cell interference in IEEE 802.11ac MU-MIMO networks degrades expected performance gain from the technology due to unplanned deployment of access points. To this end, recent research efforts envision that a central controller coordinates a set of APs to alleviate the multi-cell interference. However,...
RF energy harvesting based on wireless energy transfer (WET) can release mobile terminals from battery constraint and has drawn significant research interest. In this paper, in order to solve the problem of Simultaneous Wireless Two-Way Information and One-Way Energy Transfer (TWI&OWE-SWT) in MIMO systems, an Adaptive Time-slot and Power Allocation Scheme (A-TPAS) is proposed. And to maximize...
Recently, interference problem between WiFi devices is serious by thoughtlessly installation of access points (APs). To solve this problem, we suggest interference alignment (IA) algorithm and analyze the link level performance of IA in IEEE 802.11ac specification.
This paper presents the optimal transmission scheme for a subscriber communicating to/through an airborne relay. This scheme provides situational awareness to each communication subscriber by considering channel variations (predicted offline and estimated in real time from relay signals), data traffic and energy consumption (subject to energy constraints for battery-operated units). The optimal decision...
In order to mitigate collisions among stations in wireless local area networks (WLANs), the adoption of multi-packet reception (MPR), which is generally implementable by the multi-user multiple-input multiple-output (MIMO) transmission technique, has been discussed extensively in the literature. Although MPR can efficiently mitigate collisions in uplink WLANs, it still results in the unbalancing problem...
The investigation of the LTE traffic channel blocking probability is presented in this paper. It is very important problem related to the effective utilization of physical resources in multiservice LTE networks. There will be shown the key motivation of moving to the direction of introducing the dynamic signaling and traffic channel resource relocation based on user demand.
Device-to-Device communication (D2D) is a proximity based technique in Long Term Evolution-Advanced (LTE-A) systems. This technique can improve system throughput, but also may cause heavy intra-cell interference. In downlink transmission, the Base Station (BS) severely interferes with D2D pairs while D2D pairs reusing resources of cellular users. Therefore, D2D transmitters have to raise their power...
As the perpetually increasing demands of users for high speed, higher data rates over wide bandwidths, lower system latencies in mobile communications, LTE/LTE-Advanced as a 4th Generation of Wireless networks infrastructures widely deployed to provide better support for these requirements. Carrier Ag-gregation(CA) is an important technology for LTE-A providing enhancements to peak data rates, both...
Sensor networks always face bottleneck problem at sink nodes where communication traffic concentrates. In order to achieve highly efficient communication in such networks, a multi-code reception spread-spectrum (MCR-SS-) CSMA/CA protocol has been proposed and shown to be effective to solve the uplink bottleneck when gathering information from sensor nodes. However, actual throughput for the network...
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