Realizing mobile wireless Internet telephony and streaming multimedia testbed

Abstract

Streaming real-time multimedia content over the Internet is gaining momentum in the communications, entertainment, music and interactive game industries as well as in the military. In general, streaming applications include IP telephony, multimedia broadcasts and various interactive applications such as multi-party conferences, collaborations and multiplayer games. Successfully realizing such applications in a highly mobile environment, however, presents many research challenges. In order to investigate such challenges and demonstrate viable solutions, we have developed an experimental indoor and outdoor testbed laboratory. By implementing standard IETF protocols into this testbed, we have demonstrated the basic functionalities required of the mobile wireless Internet to successfully support mobile multimedia access. These requirements include signaling, registration, dynamic configuration, mobility binding, location management, Authentication Authorization and Accounting (AAA), and quality of service over a variety of radio access network (RAN) technologies (e.g. 802.11b, CDMA/GPRS). In this paper, we describe this testbed and discuss important design issues and tradeoffs. We detail the incorporation and inter-relation of a wide catalog of IETF protocols-such as SIP, SAP, SDP, RTP/RTCP/RTSP, MGCP, variants of Mobile-IP, DRCP, HMMP, PANA, and DSNP-to achieve our goals. We believe that the results and experiences obtained from this experimental testbed will advance the understanding of the pertinent deployment issues for a Mobile Wireless Internet.

A User-Balanced System for IP Telephony in WLANs

“…On the other hand, there are some practical studies. Dutta et al in [7] checked the performance of wireless Internet telephony in depth. In this work we observe the behaviour of the IP telephony when there is another type of traffic in the network.…”

SIP-based proactive and adaptive mobility management framework for heterogeneous networks

“…To date, many mobility management schemes have been proposed to address seamless handover focusing on intelligent selection of APs and maintaining session continuity, where each scheme employs a different handover strategy (Jayaram and Sreenivasulu, 2006;Cho and Kim, 2005;Wang and Bao, 2005;Dutta et al, 2004Dutta et al, , 2005Puttonen et al, 2005;Guo et al, 2004Guo et al, , 2005Banerjee et al, 2003;Akhtar et al, 2003;Sharma et al, 2004;Pahlavan et al, 2000;Bi et al, 2004;Sundaresan and Papagiannaki, 2006;Leggio et al, 2005). In general, these schemes could be categorized into the traditional and the advanced mobility management schemes based on a few factors.…”

“…There have been several works focusing on vertical handoff support (Dutta et al, 2004(Dutta et al, , 2005Puttonen et al, 2005;Guo et al, 2004Guo et al, , 2005 and codec switching (Ng et al, 2005;Perkins and Gharai, 2006). Our unique contributions were on integrating different level of switching schemes within a mobility management system that performs switching selectively according to the network conditions (including RSSI analysis and network traffic status), application QoS requirements and user preference, while considering the connection cost and battery power, as highlighted in the above usage scenario.…”

Applied-Information Technology with Design and Development of Bluetooth PSTN Gateway and Audio Terminal

“…3-in-1 phone is a typical speech use in the application of Bluetooth technology. The so-called 3-in-1 phone usually has two kinds of interpretation: (1) Based on the public cellular mobile phone, the users can enjoy more reasonable tariff service in cellular networks, public switched telephone network, PSTN, by only one mobile phone. (2) Though the Bluetooth technology, import the cell phones, cordless phones and multimedia computer, access telephone network or other public telecommunication network, see figure 1.…”