3G技术在当今移动通信中已广泛应用，由于应用人群众多，应用领域广泛范围大，3G移动通信在覆盖范围上的要求变得尤其重要。为了使应用移动设备的人群更便利，使3G应用领域与范围广泛，本文对既有GMS网络大楼进行3G覆盖，并增强优化3G网络的相关技术进行了研究。 为增强3G移动通信覆盖范围需解决3G技术在增强接收功率、提高接收准确率和扩大信号接收范围的问题，以增强3G移动通信的覆盖范围。本课题将对异频切换技术、全向天线技术、直放站进行研究，并应用上述技术解决3G移动通信覆盖的问题。 本文对楼宇在频率配置上采用同频+异频配置方案，低层采用同频信号，高层采用异频信号。同频覆盖的好处是节省频率资源，切换成功率高。异频覆盖能够有效避免异频污染，而且可以提高系统的容量。结合楼宇实际情况，由于来自室外信号普遍较强，会对室内信号产生污染，故采用同频+异频配置方案。此方案中，电梯井道的覆盖完全引入高层小区信号，然后利用吸顶天线引入高层异频信号到低层形成引导切换区域。由于电波传播时受到多方面的衰减，就要求天线的增益较高，全向天线得到了较多研发。全向天线一般应用于用户分布比较稀疏，话务量不高的环境，故本楼宇内采用全向天线。直放站属于同频放大设备，是指在无线通信传输过程中起到信号增强的一种无线电发射中转设备。直放站的基本功能就是一个射频信号功率增强器。一般用于扩大覆盖，填补盲区。通常采用全向天线作为转发天线。直放站在下行链路中，由施主天线现有的覆盖区域中拾取信号，通过带通滤波器对带通外的信号进行极好的隔离，将滤波的信号经功放放大后再次发射到待覆盖区域。在上行链接路径中，覆盖区域内的移动台手机的信号以同样的工作方式由上行放大链路处理后发射到相应基站，从而达到基地站与手机的信号传递。

3G technology in the mobile communication has been widely used, because of the crowd, wide application range,3G mobile communication in coverage requirements becomes particularly important. In order to make people more convenient application for mobile devices, so that the application of 3G field with a wide range, this article on the existing GMS network building3G coverage, and enhance the optimization of 3G network technology has been studied. In order to enhance3G mobile communication coverage required to solve 3G technology in enhancing the received power, improve the accurate receiving and expanded signal receiving and scope of the problem, in order to enhance3G mobile communication coverage. This task will be to different frequency switching technology, omnidirectional antenna technology, repeater for research, and application of the above technique to solve the 3G mobile communication coverage problem. The buildings on the frequency allocation adopts the same frequency + frequency allocation scheme, low layer adopts the same frequency signal, high using frequency signal. Same frequency coverage of the advantage is to save frequency resource, handover success rate high. Pilot frequency coverage can effectively avoid the pilot frequency pollution, but also can improve the system capacity. Combined with the actual situation of the building, from the outdoor signal generally stronger, the indoor signal generating pollution, it adopts the same frequency and different frequency allocation scheme. In this scheme, the elevator hoistway covered entirely into the high cell signal, and then use the ceiling antenna high-rise different frequency signals to a lower layer to form a guide switch area. Due to wave propagation by many aspects of the attenuation, requires higher antenna gain, antenna has been more research and development. Omnidirectional antenna is generally applied to the user very sparse, traffic is not high environment. This building adopts omnidirectional antenna. Repeater belonging to the same frequency amplifying device, refers to the wireless transmission during the process of signal enhancement in a radio relay apparatus. The basic function of the workstation RF signal is a power increase. Generally used to expand the coverage, fill area. Usually used as a transmitting antenna omnidirectional antenna. Repeater in the downlink, a donor antenna current coverage area of the pickup signal, through the bandpass filter to take external signals are excellent isolation, filtering signal amplifier amplification again after the launch to be covered area. The uplink link path, covering area of mobile mobile phone signal in the same way of working by uplink amplification link to the corresponding processing base after launch, thus achieved the base station and mobile phone signal transmission.