Reliable Communication over Wireless Links.

Anna Ewerlid

Nordic Radio Symposium 2001 (NRS 01) , Nynäshamn, Sweden, April 3-5 2001.

Outline:

The Wireless IP project within the PCC program studies problems that are crucial in the evolution of UMTS towards high data rates, as well as in future 4G technologies aimed at rapidly mobile terminals. The goal is to attain higher througputs for packet data in particular in downlinks, without bandwidth expansion and while providing acceptable quality of service for various classes of traffic.

Abstract:

Within the PCC Wireless IP project, we study how to optimize TCP/IP connections over fading wireless links. An important aspect here is to evaluate transport protocols for reliable (error-free) end-to-end communication.

The dominating transport protocol on the Internet is TCP/IP. This protocol has been tuned since 1977 for the primary problem in a global network, congestion and high but static latencies. The Internet is changing to utilize more wireless network segments. Wireless networks introduce new problems such as stochastic packet loss and varying latencies, which create problems for existing TCP flow control algorithms.

In this paper, we describe and compare schemes designed to improve the performance of TCP in such networks and propose our own solution for the problem.

Related publications:

PCC/NRS paper on Hybrid type-II ARQ/AMS and scheduling using channel prediction on fading channels.

Wireless IP System Proposal, RVK02

The simulation environment, RVK02.

Source:

Postscript, 1624K,   Pdf, 54K

Poster in Pdf, 11.5Mbyte