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随着移动用户的激增，对蜂窝系统的覆盖要求也越来越高。若蜂窝系统设计恰当，则可以几乎无限制地覆盖世界各地，但在实际生活中，由于隧道、山岗、高大建筑物等的影响，往往不能形成良好的覆盖。同时，蜂窝系统发展到一定阶段后，运营商为增加竞争力和改善投资回收的机会，在
With the proliferation of mobile users, the coverage requirements for cellular systems are also getting higher and higher. If the cellular system is properly designed, it can cover almost all parts of the world with almost no restrictions. However, in actual life, due to the influence of tunnels, hills, tall buildings and the like, it often can not form a good coverage. In the meantime, after the cellular system has been developed to a certain stage, operators will be encouraged to increase their competitiveness and improve their investment recovery opportunities.