Network mobility architecture was designed with mobile routers enabling continuous connection to the Internet. This paper proposes the mobile WLAN architecture that provides wide bandwidth for the users in the moving hot spot while the whole WLAN changes its point of attachment to the Internet. To serve mobile WLANs with continuous wideband, this paper focuses on the multiple mobile routers and...

A Mobile Node (MN) continuously moves in heterogeneous networks. When connections need to migrate between heterogeneous networks for performance and high-availability reasons, seamless vertical handoff is necessary first step. Everyone around the world would like to be connected seamlessly anytime anywhere through the best network. When MN changes its point of access technology handoff occurs. ...

Media streaming is a popular application demanding high data rates and hard delay constraints. These requirements raise great challenges in the wireless environment, where signal fading, noise interference and network congestion introduce data losses or corruptions. Today, the availability of the Third Generation (3G) wireless system and the Wireless Local Area Network (WLAN) provides a broader...

Due to the increasing popularity of IEEE 802.11 WLAN standards, WLAN have been wide spread to provide the last mile delivery of internet access to mobile users. Security is the critical issue in WLAN, because wireless network is open to everyone allow the illegal user to attack in open networks without any problem. Real time wireless networks require maximum level of security to assure high con...

Mit dem sprunghaften Anstieg des Marktes für drahtlose lokale Netzwerke (Wireless LANs) in den letzten beiden Jahren wurden zahlreiche neue Standardisierungsaktivitäten für den führenden Standard IEEE 802.11 aufgesetzt. Sie betreffen die Bereitstellung definierter Übertragungsqualitäten, die Verbesserung des Zusammenwirkens mehrerer Basisstationen, größere Übertragungsraten im 2,4 GHz Bereich, ...

In this paper a heterogeneous network model based on the IMS-SIP (session Initiation protocol) with the help of Authentication, Authorization, and Accounting (AAA) protocol that integrates the Worldwide Interoperability for Microwave Access (WiMAX), Universal Mobile Telecommunications System (UMTS) and Wireless Local Area Network (WLAN) technologies is proposed to improve QoS. The proposed Loos...

WLAN plays an important role as a complement to the existing or planned cellular networks which can offer high speed voice, video and data service up to the customer end. The aim of this paper is to analysis the performance of coded WLAN system for BPSK under AWGN channel. The low-density parity-check (LDPC) coding is considered as the high-performance channel coding scheme due to its good trad...

In this paper effects of two most likely interference sources: narrow-band (adjacent WLAN channels) and intra-system (Bluetooth-WLAN) interference on range and performance of IEEE 802.11b WLAN equipment were studied. Three main sets of measurements were performed: the first as “free space”, the second with narrowband interference and the third with wideband interference. The results of the firs...

This paper focuses on the integration of Internet and Wireless LANs (WLANs) and proposes a novel technique that supports seamless and efficient integration. This technique is based on a generic adaptation layer, referred to as Wireless Adaptation Layer (WAL), which is introduced between the IP layer and the WLAN Link Layer. WAL is designed to (i) dynamically cope with the wireless channel impai...

A coupled-line-based planar antenna for single-band and dual-band operation is presented. The well-known uniplanar coupled inverted-L antenna (UCILA) has a simple and specific mechanism to achieve the dual-band ratio that was not described in the past. The UCILA which shunted a short stub in the slotline portion can provide switchable modes among single-low band (3.4% for WLAN 2.44GHz), single-...