Some positions are not suitable to installation

 The dormitory may also needs the bulk shielding of signal jammer .
Bohai Rim region to the mobile phone industry clusters formed three major multinational mobile phone company in Tianjin, Beijing Nokia as its core, the five largest mobile phone spare parts production base in the star network chain. Driven by the core business, Tianjin has formed a five mobile phone production base of support, that is, Samsung, Panasonic, Roma represented chip RC components production base; to Freescale, Semiconductor Manufacturing International, represented by IC production base; the power of God, Sanyo, represented by the blue sky green energy production base; to CTS, GM production base, represented by the device; represented by the general resistance of matte plastic production base. Bohai Rim region is a typical mobile phone industry cluster of foreign-led industrial clusters, the entire mobile phone industry chain in foreign control. Some positions are not suitable to installation of this kind of signal jammer .
Thus, the entire cluster network structure showing a certain amount of instability to the stable development of clusters in the region made a test. In the following areas: structural dependence on foreign capital and strong. Vulnerable to fluctuations in the core of multinational production and the impact of the strategic shift. Its development is strongly dependent on foreign capital, technology, market and management system, embedded with local suppliers is not enough depth and breadth. Once the cluster's core business or strategic adjustments due to production fluctuations in investment shift occurs, it will shake the foundation for the development cluster. Cluster Innovation weak. Upgrading and development of industrial clusters is limited. Accompanied by changes in market demand, mobile phones life cycles continue to shorten, increasing overall competitiveness. The installation position of signal jammer can be predetermined.
Industry clusters within the chain linkage between the development of collaborative innovation to enhance the mobile phone industry has become a tool of competition between clusters. Currently the Bohai Sea region although the mobile phone industry clusters have a relatively complete industrial chain, but Yanfa weak, the lack of effective regional innovation network, the low level of integration of industry. Talent, technology, information and other advanced elements of the supply, lack of independent brands, all of which will make future development face serious challenges. Upgrade lack of intrinsic motivation. In multinational companies the leading mobile industry cluster, the cluster of innovation in the promotion of activities, businesses and other innovative resources have not yet fully formed between the main channels of cooperation of independent innovation, indicating that lateral clusters embedded poor.