HONG KONG/BEIJING: Huawei Technologies Co Ltd doubled its China smartphone revenue in the first half of this year, defying a slowdown in the world's biggest handset market that is enveloping rivals Xiaomi Inc and Samsung Electronics Co Ltd. The fourth-largest smartphone maker globally missed shipment targets for two years, but a focus shift to high-margin premium models has brought into range its goal of moving 33 percent more handsets than 2014, said a person with knowledge of the matter.