Vodafone Group has injected Rs 47,700 crore ($7.15 billion) into its Indian unit ahead of an auction of airwaves in the world’s second-biggest mobile phone market, which has seen increased competition with the entry of Reliance Jio.

Vodafone India is the second-largest carrier in the country by customers and revenues where, Bharti Airtel is the leader. The funds, injected in the first half of the fiscal year that began in April, will “enable Vodafone India to continue its investments in spectrum and expansion of networks across various technology layers”, chief executive Sunil Sood said in a statement on Thursday.

The announcement came eight days ahead of the biggest-ever spectrum auction and 17 days after the launch of Reliance Jio.

Vodafone India is a 100 percent fully owned subsidiary of the Vodafone Group. The telecom service provider has around 200 million customers in the country. Over half of its customers (107 million) come from rural India.

The company has around 22.5 percent revenue market share.

India’s already competitive telecoms landscape is set to be further roiled by the entry of conglomerate Reliance Industries, controlled by the country’s richest man Mukesh Ambani.

That has further raised the importance of an airwave auction set to start on October 1. Vodafone India is among seven carriers that have submitted interest to participate and analysts expect an aggressive bidding process.

Competition is expected to be especially intense in 4G, relatively new for India where telecoms services are one of the cheapest in the world and carrier’s margins are lower than in developed markets.

“It shows that they (Vodafone) would also be investing in the 4G LTE network, and wherever they don’t have LTE spectrum they will buy that,” said Jigar Shah, chief executive at Maybank Kim Eng Securities India Pvt Ltd, regarding the equity infusion.

Shah called the funds “very positive” for Vodafone India.

Vodafone India currently offers 4G services in some of India’s 22 telecoms zones, but still lags bigger rival Bharti Airtel Ltd and new entrant Jio in terms of airwaves for the high-speed services.

Vodafone also has plans to list its Indian unit in an initial public offering expected to raise between $2 billion and $3 billion, potentially the biggest in India. It did not give an update on the planned IPO in Thursday’s statement.

Since entering India in 2007, Vodafone has expanded rapidly, announcing on Thursday that it had crossed 200 million customers, including 107 million in rural areas.

Bharti Airtel, India’s biggest mobile phone carrier, said in November last year that it planned to invest $9 billion over three years to upgrade its network.