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Apple is reportedly beefing up its sales force as it expands its iAd mobile advertising network and readies its iTunes Radio webcasting service.

AdAge reports (hat-tip to Tom Taylor, who covers the story today in Tom Taylor now here) Apple posted want ads on its job board for five iAd-related jobs, plus another 35 to LinkedIn in August alone. Apple's job openings include account coordinators, ad design managers, project managers, and engineers to create new rich media ads for iAd. The company is also hiring ad execs with creative experience to work with advertisers and agencies to create better ads.

AdAge's coverage links to an eMarketer report from June projecting iAd U.S. revenue growth from $213 million this year to $376 million in 2014 and $623 million in 2015.

Apple will hold a special media event on Tuesday, reportedly to unveil two new iPhone models. Observers believe the new mobile operating system, iOS 7, will go live a week or so later, and with it, Apple's heralded iTunes Radio Internet radio service.

Read more in AdAge here.

In anticipation of its Internet radio service, Apple is recrafting its iAd mobile advertising service in a way that will sell and deliver ads more reminiscent of Pandora, and even broadcast radio.

Apple is now reportedly courting major advertising companies and big-name brands to the iAd platform, and has mobilized both engineering and sales staffs in this effort.

The iAd platform is an ad network that can deliver ads to apps run on Apple mobile devices. Ads can be targeted to consumers based on other apps, music, movies, and books they've downloaded.

Businessweek explains that the iAd unit was initally created to run ads from third-party developers to encourage sales of the software they create and sell in Apple's App Store. Apple cofounder, the late Steve Jobs, "bought mobile-ad network Quattro Wireless to start an advertising platform in 2010," writes Businessweek. He "wanted the service to help developers make money so they would remain committed to making software for Apple’s products... The service was intended to make money for developers -- not Apple."

One obstacle Apple needs to overcome to convince big markets is iAd's lack of fine control over which apps will run their ads. What's more, advertising on it can cost more than rival services, and campaigns are limited to apps on Apple mobile devices.

To counter this, Apple has reportedly reduced its number of different charges and cut rates. They're also allowing agencies to use purchased inventory for more than one client, and have begun to accept ads for alcoholic beverages.

Part of Apple's licensing terms with labels, sources say, is an advertising revenue share. Though the company is hoping to announce the service at its developers conference next week, the iRadio service won't be publicly available to consumers until later this year, sources say, when Apple releases its iOS 7 mobile operating system.

Read more in BloombergBusinessweek here.