The minimum shielding radius of cell phone jammer is 15m

Including the following three categories, the Physical Channel (RF), the DPCH, P-CCPCH, the PRACH, the S-CCPCH, the AICH, PICH. 2. Transport Channel (PHY-MAC, define the data transfer mode), of DCH, PCH, BCH, RACH, FACH. . The Logical Channel (MAC-RLC, define the type of data transmission) DCCH, of CCCH the BCCCH, DTCH. , The contents of the network layer (Layer 3), Radio Resource Control (RRC) protocol is responsible for the allocation of radio resources control, and send control signaling. Understand the various agreements in the Uu protocol stack, such as shown in Figure 12.2, as well as the interactions between them, as shown in Figure 12.3. Therefore,  cell phone jammer is really a good signal jammer of the high cost performance
Such as is not difficult to understand the system architecture of the BP part of the smart phone. Figure 12.4 is the BP part of the system architecture diagram of a smart phone, this phone is applied to the 4G LTE network, produced by the British 4M Wireless Ltd But the BP part of the system architecture and 3G mobile phone part of BP, the structure is basically similar. Although structurally similar, but corresponds to different mobile networks, such as WCDMA and TD-SCDMA, the implementation details of each module are not identical, leading to the corresponding hardware may not be generic. This is the significance of the so-called "dual-mode dual standby mobile phone exists. Specifically, the. The customer can use  cell phone blocker again if the battery runs out for the long time use.
3G data transfer speeds of 2M to 7.5Mb / s (HSPA), the real-time demand far more than 2G, 3G, BP part is usually to use multiple DSP hardware and so on dedicated processors to handle the encoding and decoding of the protocol data, without using software approach. Use hardware and of course, to ensure speed, but for different communication protocols, such as 2G GSM / GRPS, and 3G WCDMA / HSPA, the need for different hardware fit. Different countries and regions use different frequency bands, the RF part is different. 2G mobile phone supports GSM / GPRS / EDGE, 850/1900 and 900/1800 known as the world's mobile phone (except Japan and South Korea). And at the same time, the GPS tracking device will be jammed by this kind of cell phone jammer .
3G world phone, the general need to support all 2G protocols and frequency bands, plus 3G 2100/850/1900 (covering Japan and Korea). Contrast MTK feature phones, seniors cell phone only supports two-band GSM / GPRS, 3G mobile phones BP in part to much more complex. If the BP complexity of MTK analog into the complexity of BP's in the 8086,3 G-phone, perhaps equivalent to Core2 Duo. All of which lead to a 3G smartphone BP part of the development is very difficult. 2G era, an unbeatable combination of TI's Nokia, once occupied most of the market share of the market-dominant companies. The minimum shielding radius of  cell phone jammer is 15m.
However, due to the delay of the rise of MTK, and 3G chip shipments, TI gradually lose the advantage of the baseband chip market. As for the 2G era, the baseband chip manufacturers NXP after being acquired last legs, the Broadcomm try to use low prices to compete for the market, but almost failed. Marvell's Tavor won RIM's orders, but the subsequent weakness. Qualcomm maneuvers, AP + BP SoC chip, firmly occupied the 3G single-chip market. At the same time, Qualcomm, with the low-end 3G chip of BP, BP-specific chip market to compete with Infineon. BP partly responsible for processing the call, real-time high. It means the best shielding range of cell phone jammer is 25m.