Special Issue: Radio Link and Transport Protocol Engineering for Future-Generation Wireless Mobile Data Networks
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The emergence of wireless packet data applications (e.g., wireless web access, interactive and real-time mobile multimedia applications, wireless interactive gaming, client/server applications) is the key driver for the evolution of future-generation wireless networks from the current 2G/3G systems. To support such applications, efficient and intelligent engineering of protocols at different layers in the protocol stack, with the wireless network in mind, and the development of related concepts and technologies will be essential. While in wired networks the applications and protocols are quite fine-tuned, the unique characteristics of wireless networks such as user mobility, frequent link failure, limited link capacity, and limited battery and computational resources of mobile devices pose significant challenges in designing linklevel and transport protocols for future-generation high-speed wireless data networks. Within this context, this special issue addresses some of the radio link and transport protocol engineering aspects for future wireless data networks. We have selected 8 papers for this special issue from 24 submissions. The first paper by T. Farnham proposes a flexible protocol stack framework with an open application programming interface to support dynamic configuration of link layer protocols in different wireless networking scenarios. Also, using the proposed framework, link layer optimization can be performed to adapt to the changing radio environment by utilizing dynamic run-time software download and configuration. It is shown that the performance benefits from optimizing the link layer protocols depend largely on the specific scenario and user or service preferences. The second paper by L.-C. Wang, Y.-C. Chen, and M.-C. Chen proposes a cost-function-based radio link layer rate adaptation mechanism for the wideband code division multiple access (WCDMA) networks by taking channel impacts, link level buffer occupancy, and service priority into account. The rate adaptation mechanism can be implemented by exploiting the transport format selection procedure in the medium access control layer. The authors show that the proposed rate adaptation mechanism can effectively improve throughput in a multiservice environment at the cost of marginal decrease in power efficiency. For the future-generation wireless networks, IPcentric radio resource management schemes will be required in the radio access network. The third paper by V. Friderikos, L. Wang, M. Iwamua, and A. H. Aghvami proposes a radio link level power and rate adaptation scheme that integrates QoS information from the IP layer of the differentiated services (DiffServ) architecture together with lower layer criteria in order to optimize packet transmission over a CDMAbased air interface. The proposed scheme achieves the required per-class aggregate data rate and at the same time increases aggregate power gains by differentiating transmission of in-profile and out-of-profile packets. Streaming multimedia content over wireless links is a significant research challenge. In the fourth paper by I. Haratcherev et al., the authors present a signalstrength-based link adaptation algorithm for rate control for real-time multimedia streaming over IEEE 802.11-based wireless LANs. Experimental results based on the actual implementation of the proposed scheme shows that the rate control algorithm, due to its faster responsiveness to the fluctuating link conditions, can achieve a much higher video quality compared to that of a statistics-based rate controller, which is more common in current 802.11 products. Designing and optimizing reliable transport protocols for wired-wireless networks is a fundamental research problem. The fifth paper by K. Ghaboosi and B. H. Khalaj presents a new modification to the TCP, namely CICADA, which aims at isolating