If the paper is about the 3G industry in China in 2021, the structure could include background on 3G in China, developments in 2021, competition between telecom providers, user adoption, challenges (like spectrum allocation), and future outlook. However, considering that 3G was already being phased out in many countries by 2021, in China it might still be in use in certain rural areas. Also, the government's policies regarding network infrastructure, 4G and 5G rollout, and how 3G fits into the overall strategy.