Available frequency band is 9.6MHz for channel number 47 — 95, 49 pairs of carrier frequency can be 12/9/8/6/6/6/2 law divided into 7 groups, the base station carrier frequency can be configured as a 6/6 / 6 structure. If the available band wide, the 12MHZ above. In theory, the base station carrier frequency can be configured into a 8/8/8 or even more. Thus, the capacity of the network will be greatly enhanced. More stringent requirements on the ability of the equipment and software functionality. BCCH and TCH carrier frequency selected in different ways, is divided into several MRP, are presented to the following two types: fixed-MRP is allocated to the traffic channel (TCH) layers of the carrier frequency is fixed, independent of each other, do not overlap. It can stop the too powerful blocking of cell phone jammer coming out of the prison.
As shown in Table 1, Table 2 shows the frequency planning is done, the layer configuration carrier frequency, the advantages of doing so is to TCH contained frequency adjustment easy, if a layer of TCH interference, as long as the adjustment of that layer can be, do not Consider the impact of the other layer of the carrier frequency. The disadvantage is that the carrier frequency configuration is not flexible. Improved MRP is allocated to the traffic channel (TCH) of the carrier frequency of the layers overlap each other, not independent, specific groupings shown in Table 3, the distribution of TCH3 layer carrier frequency unchanged, while the increase in TCH2 layer the TCH3 layer carrier frequency and an increase in the TCH1 layer TCH2 layer of the carrier frequency for frequency planning, according to the traffic density distribution of the different multiplexing, flexible configuration of the carrier frequency. The antenna direction of cell phone jammer can determine the effective shielding range.
MRP technology to break down the traditional fixed frequency reuse pattern, so that the carrier frequency configuration flexibility, in particular, a fan-shaped plot the distribution of the carrier frequency can not be the same fan-shaped cell frequency reuse carrier frequency identical, both to improve the same frequency interference protection, improved frequency hopping effect, which is a notable feature of MRP technology. MRP technology can be flexible according to capacity requirements and the traffic distribution of the frequency planning, can gradually increase the network capacity, high capacity than simply use a 4 × 3 complex network in a way, using a simple 3 × 3,2 × 3,1 × 3 reuse compared to impact on the quality of the network is small, using the techniques such as frequency hopping, power control, discontinuous transmit (DTX) is a GSM system should have the technology. The antenna of cell phone jammer points to the place to be jammed.
No other special requirements on the equipment and software, as long as careful network planning and optimization to meet the network safe and reliable operation. The surplus of the carrier frequency can be used for micro-cellular. Concentric garden technology is in the GSM network, the wireless coverage of the district (part of a base station or base station (sector antennas) the area covered), divided into two layers, the outer and inner, also known as top-level (Overlay) and bottom ( underlay). The outer layer of coverage is usually cellular cell, while the inner layer of the coverage focused on the base station near the outer layer of generally conventional 4 × 3 reuse, while the inner layer is dense multiplexing ways, such as 3 × 3,2 × 3 or 1 × 3. The location has the most powerful shielding effect of cell phone jammer .