According to China Manned Space Engineering Online, China recently successfully launched a second data relay satellite named Tian-Lian One-02. The satellite is to be used for China’s first space docking mission planned for the second half of the year. The satellite was developed by China Academy of Space Technology, under China Aerospace Science and Technology Corporation. This new satellite works in conjunction with the Tian-Lian One-01 satellite, launched three years ago, to form a network to support space data relay and to provide monitoring and control services. The Tian-Lian One-01 satellite served the manned space mission Shenzhou VII to increase the coverage of monitoring and control services from 15% to 50%.
Source: China Manned Space Engineering Online, July 12, 2011