MediaTek may be biting at Qualcomm’s 4G heels, but so far the US vendor, despite its problems in China, is still growing its share with the country’s vendors. Qualcomm has acted aggressively in the past year to pack functionality into 4G system on chip (SoC) products for low-cost smartphones and this has paid off. According to Will Strauss of chip analyst firm Forward Concepts: “Qualcomm’s chips are now doing quite well in the inexpensive smartphone market with fast-rising China-based companies like Xiaomi and Vivo. Although their China-specific smartphones also employ modem chips from other vendors (like Spreadtrum and Innofidei), the devices for 4G or for the West tend to favor Qualcomm.” Now MediaTek is fighting back with a series of…