HONG KONG--Softbank Corp.'s (9984.TO) acquisition of Sprint Nextel Corp. (S) will likely give the Japanese company effective control over two U.S. wireless carriers that hold rights to coveted airwave spectrum, making the $20 billion deal more appealing.

For U.S. consumers, that could translate into better network quality and more affordable smartphone payment plans, analysts said.

Last Monday, Softbank revealed plans to buy a 70% stake in Sprint. Less than a week later, Sprint disclosed its intention to raise its stake in Clearwire Corp. (CLWR), a small but spectrum-rich U.S. wireless carrier, to slightly above 50%.

As the Japanese telecommunications carrier expands into the U.S. market, it could take advantage of the combined spectrum resources at Sprint and Clearwire to take on their larger rivals Verizon Wireless and AT&T Inc. (T). Softbank could also strengthen its global position in the still-nascent market for fourth-generation, or 4G, wireless services, as Clearwire's planned 4G network will use a technology compatible with what the Japanese company is already using.

"In the telecom industry, having more spectrum definitely gives you an advantage," said Tokai Tokyo Research Center analyst Yusuke Tsunoda.

Telecom carriers are fighting over spectrum due to explosive demand for mobile data and the need to build a faster network in the age of smartphones. While airwaves that transmit wireless signals are controlled by the government, telecom carriers and broadcasters license airwave spectrum to operate their services. How much spectrum access a carrier has can determine its coverage, service quality, and ultimately its competitiveness in the industry. The battle over spectrum has been a major factor behind recent major telecom deals in the U.S. and globally. AT&T, for example, cited the need for spectrum in its failed attempt last year to take over Deutsche Telekom AG's (DTE.XE, DTEGY) T-Mobile USA for $39 billion. Earlier this month, T-Mobile agreed to merge with smaller U.S. rival MetroPCS Communications Inc. (PCS), a marriage analysts have said would address the two carriers' spectrum needs.

Sprint is moving to raise its stake in Clearwire to 50.4% from 48%. With a majority stake, Sprint still won't have complete control over Clearwire, as executive changes and other major decisions require votes from 10 of Clearwire's 13 board directors due to a previous agreement.

Still, Sprint's intention to buy an additional stake "is likely another step in an evolutionary process that could eventually result in the company gaining sole control" of Clearwire, said Fitch Ratings, in a note Friday.

"The Softbank deal gives Sprint significant financial flexibility and a broader range of options, including how to address the longer term strategic options with Clearwire," Fitch added.

As part of Softbank's acquisition, debt-strapped Sprint will receive an $8 billion cash injection from the Japanese company.

Softbank's deeper ties with Clearwire via Sprint could also speed up construction in the U.S. of a certain type of 4G network called TD-LTE, which is compatible with the technology Softbank is already using for some of its 4G mobile services in Japan. China Mobile Ltd. (CHL, 0941.HK), the world's biggest mobile operator by subscribers, also supports TD-LTE, and Beijing last week disclosed plans to allocate wireless spectrum for a next-generation network using the same technology. Clearwire could provide Softbank with a larger global presence in the TD-LTE market, which would put the Japanese company in a better position if TD-LTE becomes a major 4G standard in the future, industry observers said.

Sprint Chief Executive Dan Hesse told The Wall Street Journal in an interview last week that access to Clearwire's spectrum is important. "What Clearwire does is that it balances our portfolio by providing that really high-capacity capability," Mr. Hesse said.

A Softbank spokesman declined to comment on Sprint's decision to raise its stake in Clearwire or the move's implications.

Spectrum was a factor behind Softbank's recent decision to buy smaller Japanese carrier eAccess Ltd. (9427.TO) through a $2.3 billion stock-swap deal. At an Oct. 1 press conference disclosing the deal, Softbank Chief Executive Masayoshi Son said the spectrum owned by eAccess would help Softbank's next-generation fast-speed mobile service compete on more-equal grounds with similar services offered by larger Japanese carriers NTT DoCoMo Inc. (DCM, 9437.TO) and KDDI Corp. (9433.TO).

In an interview with The Wall Street Journal last week, Mr. Son said he wouldn't rule out further deals in the U.S. even as he focuses on closing the acquisition of Sprint.

--Thomas Gryta and Daisuke Wakabayashi contributed to this article.

Write to Juro Osawa at juro.osawa@wsj.com.

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