A Survey on Voice over IP over Wireless LANs
نویسندگان
چکیده
Voice over Internet Protocol (VoIP) is a form of voice communication that uses audio data to transmit voice signals to the end user. VoIP is one of the most important technologies in the World of communication. Around, 20 years of research on VoIP, some problems of VoIP are still remaining. During the past decade and with growing of wireless technologies, we have seen that many papers turn their concentration from Wired-LAN to Wireless-LAN. VoIP over Wireless LAN (WLAN) faces many challenges due to the loose nature of wireless network. Issues like providing Quality of Service (QoS) at a good level, dedicating capacity for calls and having secure calls is more difficult rather than wired LAN. Therefore VoIP over WLAN (VoWLAN) remains a challenging research topic. In this paper we consolidate and address major VoWLAN issues. This research is helpful for those researchers wants to do research in Voice over IP technology over WLAN network. Keywords—Capacity, QoS, Security, VoIP Issues, WLAN.
منابع مشابه
Voice Over IP: Improving the Quality Over Wireless LAN by Adopting a Booster Mechanism - An Experimental Approach
The performance of unreliable voice transmission (Voice over IP) over wireless links is measured not by the throughput but by the perceptual speech quality. The speech quality is impaired by packet losses, which are common on wireless links, and by high transmission delays. In this paper, we describe the design and implementation of a novel Speech Property Based Booster that improves the qualit...
متن کاملPerformance of Header Compression for VoIP in Wireless LANs
The increasing number of Voice over IP (VoIP) phones in wired and wireless technologies leads us to the performance discussion of VoIP traffic in IEEE 802.11 WLAN environments. Originally designed to transport best effort data traffic, WLANs may experience some problems with delay-sensitive and low-rate voice traffic. This paper investigates the Voice over WLAN (VoWLAN) capacity for different W...
متن کاملPacket Loss Concealment for G.722 using Side Information with Application to Voice over Wireless LANs
The G.722 wideband speech codec offers higher quality and better naturalness than G.711, is low in complexity, has low delay, and tandems well with other codecs. This makes it an attractive codec for Voice over IP and Voice over Wireless LANs. However, loss of a G.722 coded speech frame results in a mismatch of the encoder/decoder states that affects the decoding of subsequent correctly receive...
متن کاملA Novel AP for Improving the Performance of Wireless LANs Supporting VoIP
Recently, wireless LANs based on the IEEE 802.11 standard have become popular and widely used, and Voice-over-IP (VoIP) is one of the most promising technologies to be used in mobile devices over wireless networks. Up-to-date, new technologies have improved, providing a high data rate to support various kinds of realtime applications. However, besides the need for higher data rates, seamless ha...
متن کاملRethinking Mobile Telephony With the IMP
The recent widespread deployment of wireless LAN technology raises the question of how a mobile telephony system might instead be architected to use wireless LAN access points and the Internet to achieve similar services. In this paper, we examine an end-to-end architecture for mobile telephony, with a strong focus on endpoint issues. We have designed, implemented, and have experience using dev...
متن کامل