Mobile infrastructure sharing is on the rise, whether encouraged by regulators or adopted willingly to reduce costs. Probably the largest tower sharing deal in the world is now on the cards, between the three Chinese cellcos, and it could even be extended to base stations. This could accelerate LTE roll-out, but squeeze suppliers, which are looking to China’s 4G roll-outs as a rare source of wireless infrastructure growth in 2014. China Mobile, China Unicom and China Telecom are in negotiations, though no agreement has yet been reached, according to filings by the three firms with the Hong Kong stock exchange. No details were provided, but the talks are understood to focus on reducing the cost of building out LTE, in…