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The physical (PHY) layer peak rate of the wireless local area network (WLAN) has been almost exponentially improved over the past 15 years since 1999. However, it is proved that the throughput is very low comparing to the PHY peak rate, and the media access control (MAC) efficiency is very low in the current WLANs specification, especially in dense deployment scenarios. Therefore, to achieve high...
WiFi is currently the most widely used communication standard over wireless LAN . Facing the trend that broad band and networking quality are emphasized, the IETF SIGTRAN working group and IEEE 802.11standards working groups proposed a new-generation communication protocol, stream control transmission protocol (SCTP) and wireless LAN communication standard, IEEE 802.11ac/VHT for transport layer and...
Delayed offloading of mobile user delay tolerant traffic, through other networks such as WiFi networks or millimeter wave (mm-w) gates, is a promising solution for dealing with the ever-growing problem of wireless cellular network capacity. In this paper, we investigate the problem of how we can optimally associate a user with delayed traffic to a nearby offloading zone, i.e., to which nearby offloading...
In this paper, a medium access protocol suitably adapted for the operation of Long term evolution (LTE) in unlicensed band (LTE-U) is proposed. The MAC design considers the impact of LTE-U on the devices operating in unlicensed band, such as WiFi and legacy LTE. The LTE-U design differences from the legacy LTE system, an inherently a synchronized, tightly controlled system are explored. The performance...
Green communication has been a hot issue with the energy consumption of ICT industry continuously growing. To achieve the goal of energy saving, base station sleep schemes are extensively investigated; however, they are hard to implement in actual commercial network for the risk of losing of users. So in this paper, we try another way to improve the energy efficiency of LTE network by interworking...
An increasing number of internet connected devices access large multimedia files over the Internet. Therefore, the bandwidth demand is exponentially increasing. To satisfy users’ demands, multi-band wireless routers, which simultaneously support several bands, are developed. However, current multiband routers do not attempt to maximize the utilization of frequency bands nor consider the energy consumption...
Machine to machine communication (M2M) or machine type communication (MTC) facilitates communication without any human intervention. These applications will support an enormous number of stations (STAs). To mitigate degradation of the throughput and delay performance in wireless local area networks (WLAN) that employ carrier sense multiple access collision avoidance (CSMA/CA) protocol with request...
Interleave division multiple access (IDMA) is a Non-Orthogonal Multiple Access (NOMA) technique regarded as an enabling technology for next generation wireless systems. IDMA can improve the system efficiency by supporting multiple access for a large number of stations. For high spectral efficiency transmission in IDMA, previous works proposed systems in the context of Superposition Coded Modulation...
With the proliferation of Internet of Things (IoT) devices such as smartphones, sensors, cameras, and RFIDs, it is possible to collect massive amount of data for localization and tracking of people within commercial buildings. Enabled by such occupancy monitoring capabilities, there are extensive opportunities for improving the energy consumption of buildings via smart HVAC control. In this respect,...
This paper presents analytical expressions of network throughput for wireless 2-hop networks with tethering function at any offered load. Network throughputs can be obtained analytically by expressing collision probabilities and frame existence probabilities with respect to each node. The validities of the analytical expressions are confirmed from quantitative agreements between analytical and simulation...
Hybrid aggregation is a frame aggregation scheme in IEEE 802.11 Medium Access Control (MAC) which combines the use of MAC Service Data Unit Aggregation (A-MSDU) and MAC Protocol Data Unit Aggregation (A-MPDU) together. Using hybrid aggregation, we can get higher throughput than using either A-MSDU or A-MPDU only scheme. However, the throughput may decrease in some high Bit Error Rate (BER) conditions...
One of the goals of 5G is to simplify the 4G core network and enable interworking across multiple Radio Access Technologies (RATs) without the addition of specialized network elements, protocols and interfaces that perform often redundant functions for each access technology. Achieving this reduces operator costs, and can improve the subscriber experience when devices can access multiple RATs. In...
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