In April 2015, the Federal Communications Commission (FCC) announced that it will release the CiTIzens Broadband Radio Service (CBRS) band at 3,550-3,700 MHz with a bandwidth of 150 MHz. It is worth noting that the FCC uses a three-layer spectrum access architecture to release the right to use the band, which means that anyone has the opportunity to use the band. Commercial services using this band are expected to appear in 2017. Google Xuanyi said that in general, operators bid only for the spectrum they can use. However, some operators do not use so many users because of the fact that the spectrum is idle. In some cases, the number of users is too large, resulting in overcrowded spectrum. In addition, there are some smaller companies that do not have much capital or have not obtained a spectrum license because they are not competitive. Xuan Yi pointed out that if the spectrum sharing method can effectively reduce the waste of resources, other users can use it without using it, and it can also reduce the congestion problem. A three-layer spectrum access architecture was introduced in the FCC's 3.5 GHz CBRS band release plan. Under this architecture, when the high-level user (the first-tier user who is the license holder of the band and the second-tier user who has paid the license fee) does not use the band, the third-tier user (anyone) can use. When there are many third-tier users in the same place, use the available frequency according to the principle of fairness. However, the management of the third layer requires strict control regulations. Therefore, the FCC will implement spectrum sharing between different users and applications using the Spectrum Access System (SAS). At the same time, considering the key role played by the SAS mechanism in managing CBRS access and operation and ensuring the continuity of spectrum assignments, the FCC will design a certification process to review applications from SAS managers. Xuan Yi further analyzed that the concept of spectrum sharing has been introduced for a long time, but the main key to success is the government. Because when the spectrum has been auctioned, how to redistribute and share it must be rigorously prescribed by law. Second, the industry also needs heavyweight operators to support such practices. Not only that, but also whether the spectrum itself is easy to use. When a spectrum is easy to use, it will be supported by operators. If the frequency of the spectrum is too high or too low, it will reduce the operator's support. Willingness. Qualcomm, Nokia, Intel, Google's Access Technologies, Federated Wireless and Ruckus Wireless announced the establishment of the CBRS Alliance in early 2016. The alliance is currently promoting the commercialization of LTE solutions for the CBRS band, including LTE-TDD, Licensed Assisted Access (LAA) and MulteFire, all of which are technologies that can co-exist in the CBRS band. Barrier Strip Connector ,Barrier Type Terminal Block ,Dual Row Terminal Block ,Barrier Terminal Cixi Xinke Electronic Technology Co., Ltd. , https://www.cxxinke.com