The wireless industry doesn't seem to have been slowed much by the recent downturn in the economy. CTIA calculated the U.S. wireless industry investment at around $310 billion in 2010. Wireless companies' research and development spending also appeared to continue unabated--not surprising given the cut-throat nature of competition in the industry. Thus, Fierce has taken a look at the research and development habits of some of the wireless industry's top vendors, in terms of spending. Check out how R&D spending stacks up among Alcatel-Lucent (NYSE:ALU), Apple (NASDAQ:AAPL), Ericsson (NASDAQ:ERIC), Motorola, Nokia (NYSE:NOK), Qualcomm (NASDAQ:QCOM) and Research In Motion (NASDAQ:RIMM). Special report