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Heterogeneous wireless systems such as a combination of mobile broadband wireless access (MBWA) and wireless local area network (WLAN) are candidates to attain the large capacity in next generation mobile communication systems. For capacity expansion, small cell networks using millimeter wave are necessary. However, small cell networks have only several meters coverage, thus their resources are used...
In this paper, we optimized the performance of wireless local area networks, MAC and physical layer behavior plays a vital role in wireless network. In the presence of interference, optimizing physical layer parameters carrier sense threshold, preamble detection, physical layer capture and MAC layer queue length. We demonstrate in our simulation study the effect of high rate traffic for node density...
Recently, the full duplex communication has been spotlighted as one of key technologies of the future wireless local area network (WLAN). The full duplex MAC protocols are actively researched because the feasibility of full duplexing is achieved because of the technology evolution. The full duplex MAC protocols can be categorized as two types. One is centralized type and the other is distributed type...
In dense deployments, the performance of IEEE 802.11 Wireless Local Area Networks (WLANs) depends on the development of efficient contention resolution mechanisms since the collision probability can be high even with low number of users with the current 802.11 MAC mechanism. Also, the current 802.11 MAC is not opportunistic in the sense that it does not consider channel quality and traffic load of...
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,...
Dense deployment of wireless local area networks (WLANs) is part of the next generation Wi-Fi and standardization (802.11ax) efforts are underway. However, dense deployment of WLAN access points (APs) faces increased interference and uncoordinated association of user stations (STAs) with APs, which degrade network throughput. To assess the potential of improving uplink throughput in the presence of...
In this paper, we study the throughput fairness performance in IEEE 802.11 based wireless local area networks (WLANs) without and with successive interference cancellation (SIC) technique. We consider a single rate WLAN with carrier sense multiple access with collision avoidance (CSMA/CA) medium access control (MAC) protocol for MAC layer and a SIC technique at the physical layer. We determine the...
We are developing multi-hop wireless LAN access points (APs) for a Community Information Network (CIN) to be deployed in Takanawa area, Minato City, Tokyo, Japan, to transfer information supporting citizens' daily lives and to provide the internet access environment for both residents and tourists. This paper shows a prototype development of the AP device for the CIN made by the Raspberry Pi boards...
All existing protocols in wireless networks are mainly based on Carrier Sense Multiple Access with Collision Avoidance. By applying collision detection in wireless networks, the time spent on collision can be reduced and thus improves system throughput. However in a real WLAN scenario due to the use of nonlinear modulation techniques only receiver can decide whether a packet loss takes place, even...
Nowadays, receivers can separate multiple transmitted packets simultaneously through the use of advanced signal processing techniques. This capability is called multi-packet reception (MPR). Currently, several proposals have been made to modify the operation of 802.11 and take advantage of the MPR capability. However, under multi-rate transmissions, these techniques suffer from the phenomenon known...
In this paper, we investigate issues of fairness and spatial reuse in heterogeneous wireless local area networks (WLANs) based on IEEE 802.11ax. According to discussions in the evolving IEEE 802.11ax standardization, the value of carrier sensing threshold (CSTH) needs to be increased, in order to improve spectral efficiency of WLANs by means of spatial reuse. We reveal a serious problem of unfairness,...
To meet the ever increasing demand for wireless local area network (WLAN) connectivity, we propose to use the frequency range allocated for ultra-wideband (UWB) radios as an alternative spectral resource for conventional WLAN systems. Since the maximum permitted emission of UWB radios is 50-dB smaller than that of conventional WLAN devices, aerial communication range will be shortened to less than...
MAC interference in IEEE 802.11 network is caused by overlapped signal ranges and complex carrier sensing topology. Data throughput and wireless coverage increases by sender's transmission power in free space and this property identified the transmission power as a standard indication for wireless efficiency; however, increased transmission power also implies longer reachable signal range and higher...
This paper describes the performance analysis of several existing backoff algorithms in terms of achievable throughput and short-term fairness. Through the performance evaluations conducted by the event-driven simulator we show the tradeoff of the maximum achievable throughput and short-term fairness. According to our investigations controlling the growth rate of contention window (CW) can make notable...
For the next-generation mobile communication, heterogeneous wireless networks have been discussed to attain high throughput and wide coverage. In heterogeneous wireless networks, wireless local area network (WLAN) is important as a destination to offload traffic. However, hidden terminal problem and exposed terminal problem of WLAN become seriously in high user-density, high traffic demand and multicell...
With the rising of smart devices and data-intensive service, more and more people have been dedicated to the study of a novel network architecture and communication solution. As 5G revolutionizes how humans acquire, manage and engage with information, this trend will accelerate. To meet this evolution, a novel admission control strategy in LTE-A and WLAN integrated network is proposed in this paper...
We propose co-locating a Super Wi-Fi access point (AP) with a Wi-Fi AP aiming to mitigate the performance anomaly of the traditional WLAN by relocating low-rate Wi-Fi stations (STAs) in the outskirts of Wi-Fi's coverage to Super Wi-Fi. This strategy is based on the two key insights: it would enhance the throughput of Wi-Fi STAs due to the reduced number of STAs; it also provides QoS guarantees to...
We exploit the Degrees of Freedom (DoF) resulting from the deployment of multiple antennas, both at the Access Points (APs) and the clients, to address the Hidden Terminal problem in Multi User (MU) Multiple Input Multiple Output (MIMO)Wireless Local Area Networks (WLANs). This approach permits concurrent transmissions and is able to maintain a constant gain in network throughput in a Hidden Terminal...
Wireless local area network (WLAN) using millimeter wave (mmWave) communications is one of enabler of next generation wireless access networks since huge bandwidth is available in mmWave bands and it enables beyond Gbit/s communications. This paper experimentally evaluate the PHY rate and the throughput performance of off the shelf mmWave WLAN devices that are compatible with IEEE 802.11ad standard...
It is known that the accumulated contact data of all stations of multistatic sonar arrays cannot be handled by traditional VHF links. While other technologies like satellite communication systems could handle the amount of data, these systems are usually too costly in terms of money, weight, or power consumption to be deployed on sonar buoys. Therefore, we installed commercial off-the-shelf WLAN with...
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