STOCKHOLM (Reuters) - Ericsson expects cut-throat competition between telecoms equipment makers as China prepares to spend billions of dollars on high-speed networks, punishing margins at a time when profitability is already under pressure. A decade-long price war launched by Chinese vendors Huawei and ZTE has already forced suppliers like Nortel and Motorola out of the market while smaller players like Alcatel-Lucent are mired in losses. Equipment makers hoping the roll-out of 4G - also known as LTE - networks in China later this year will ease industry problems will be disappointed. ...