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This paper proposes a fast and low-complexity retransmission scheme for Industrial WLAN system. The proposed scheme exploits the frequency diversity and employs channel selectivity in order to achieve high-reliability and low-latency communication. The channel selectivity is carried out instantly by re-scheduling sub-carrier allocation during OFDM transmission in order to obtain diversity gain. Evaluation...
A user in IEEE 802.11(Wi-Fi) system must associate to a particular Access Point (AP) to communicate through the Internet. According to the current association method which is based on Receive Signal Strength Index(RSSI), the user first identify its convenient APs and associate with the strongest AP, excluding the fact whether that AP is overloaded or not. In current scenario, the wireless network...
In this paper, TA-ARQ (Time-constrained Aggregated Automatic Repeat-reQuest) with an adaptive rate control for SVC streaming based on HDP transport protocol is proposed. To meet the requirement of terminal equipment in the heterogeneous network environments, we consider SVC for different applications. Selected NALUs (Network Abstraction Layer Units) are sent according to the quality estimation of...
Quality of Service (QoS) is considered as the standard check of a conveyance system to show provided services and its availability. For illustration application like video conferencing, voice over ip (VOIP), streaming videos, real time operation feel necessity for draconian assurance on jitter, packet loss, prioritization of services and end-to-end delay. So to overcome these issues a novel scheme...
Communication and data networking field are being changed by the use of wireless networks, which enables user to communicate and access application and information without wires anywhere and anytime. This emerging and innovative technology while used in the computer networks which are supporting more flexibility and mobility. But one of the most considerable factors is power consumption. Because majority...
Full audio bandwidth with very low algorithmic delay CODEC is state-of-the-art in CODEC technology. This type of CODEC is expected to support full frequency range for human hearing. It will enable future multipurpose audio applications, especially those which require high quality of audio signal with very low delay. A popular choice for this type of CODEC is the Constrained Energy Lapped Transform...
The uncoordinated deployment of many high-bandwidth 802.11a/g/n access points (APs) in urban areas offers the potential for WLANs to be a strong complement to cellular networks in providing ubiquitous connectivity. However, given that the bandwidth of the backhaul links connected to these APs is often an order-of-magnitude lower than that of the WLAN channel, aggregating the throughput from multiple...
Multi-standard connectivity has become de-facto for smart phones and laptops but is emerging also to other more specialized gadgets like e-book readers. Such devices need to be designed for the best performance even when multiple standards are operating simultaneously. In the future, RF band allocations will make the scene even more complex especially in LTE evolution towards band aggregation. Once...
Today's laptops and mobile terminals are equipped with several network interfaces belonging to different access technologies. Users can benefit from multi-homing to access network services anywhere, at any time and from any network. Multipath TCP (MPTCP) is a modified version of Transmission Control Protocol (TCP) which allows a TCP connection to simultaneously send data over multiple paths. One of...
There is an unfairness between long-term TCP flows and short-term TCP flows because of the single queue and first-in-first-out scheduling algorithm in access point (AP) in WLAN. This paper suggests a priority scheduling algorithm. In the algorithm AP maintains one queue with a timer for each TCP flow. The scheduled orders of queues are based on values of timers. Network Simulator (NS) is used to simulate...
At present, none of the wireless access or mobile cellular network technologies provides ubiquitous coverage and the complete set of services required by the users. Therefore, the next generation of wireless networks i.e. 4th Generation (4G) network aims at the integration of these distinct yet complementary networks to satisfy user requirements and to provide ubiquitous coverage, anywhere and anytime...
Admission control plays an important role in providing Quality of Service (QoS) guarantees for wireless mesh networks (WMNs). Multipath routing can improve network performance in reliability and load balancing. However, when the multipath routing are adopted in 802.11-based WMNs, the transmission with bandwidth assurance is facing rigorous challenges. In this paper, a novel joint design of multipath...
When a mobile host transmitting real-time video traffic using DCCP CCID3 moves between two wireless LAN access points with different congestion situations, it is difficult to quickly change the transmission rate according to the changes of communication environment because controlling the sending rate depends on feedback information. To solve this problem, we recently proposed a predictive rate control...
With the rapid proliferation of bandwidth intensive content, a newer technology is essential as 802.11 a/b/g cannot satisfy the requirements, like higher bandwidth. The latest generation, 802.11n, is the answer and helps accelerate the uptake of Wi-Fi integration in CE (Consumer Electronic) devices. Nowadays, most of CE devices are Wi-Fi-enabled and the unprecedented growth causes a dearth of bandwidth...
Dynamic Spectrum Access in a Wireless LAN can enable a set of secondary users' devices to access unused spectrum, or whitespace, which is found between the transmissions of a set of primary users' devices. The primary design objective for an efficient secondary user access strategy is to be able to “scavenge” spatio-temporally fragmented bandwidth while limiting the amount of interference caused to...
In an IEEE 802.11 wireless LAN, the access point transmits broadcast packets once at a fixed rate, often the lowest rate of the basic rate set, which results in low bandwidth efficiency and no reliability. This problem can be addressed by proper-designed cross application and MAC layer broadcast mechanisms, in which reliability is provided by application layer forward error corrections, and broadcast...
Seamless mobility across heterogeneous wireless networks requires a certain level of Quality of Service (QoS) to be assured as it determines the packet loss and delay during handoff procedure. Selecting the target network in an appropriate time plays a crucial role towards achieving ubiquitous networks. This paper proposes a network discovery and selection method called Improved Access Router Discovery...
Examining a protocol is necessary in order to identify its advantages and disadvantages precisely. Here we apply UPnP technology on an Ethernet network to evaluate its performance and identify its positive and negative sides. As it is known that UPnP can be run on many media that support IP such as Ethernet, Bluetooth and Wi-Fi. This paper produces an evaluation of UPnP service discovery protocol...
The third generation (3G) of mobile communications has been successfully standardized and implemented throughout the world. International Mobile Telecommunications-2000 (IMT-2000) technology is a representative realization of 3G technology. Currently IMT-2000 is evolving to a next generation standard named IMT-Advanced. Major milestone technologies that lead 3G in to the fourth generation (4G) standards...
Application of wireless technologies in Industrial communication claims for timely data delivery, since many applications are based on processes with real-time constraints. Currently, the 802.11B is the most used wireless protocol in the industrial applications area but it is not the ideal solution owing to the contention for medium access which can cause unbounded delays. In this paper the authors...
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