There are a number of relatively independent base band processing units and carrier processing units in the system. The working frequency carrier of each carrier processing unit is fixed, the service information of each communication path is processed by fixed base band unit, and then the processed information is transferred to carrier units of different … Read more
When you decide to apply hopping to any BTS then below parameter require to previously defining. All the parameters which are related to hopping are configured in cell/configure Hopping data Hopping mode: the mode used by the BTS system, including three options: not hopping, base band hopping and RF hopping. MA (Mobile Allocation Set): the … Read more
In GSM system, the interference strength and distribution on each frequency carrier in cell are different, the carrier variation of the bursts of the same communication low the interference on signal, the radio wave interference on communication is equalized. If no hopping is used, the mobile station will always work on fixed frequency carrier, each … Read more
Hopping can lower the influence of Rayleigh fading to signal strength. This influence equals to frequency diversity. One voice code block of GSM is transmitted in 8 bursts separately after channel coding. Since the Rayleigh fading is based on frequency, in other words, the valley point of signal fading appears in different locations at different … Read more
Hopping can lower many kinds of interferences, such as co-channel interference, adjacent channel interference, inter modulation interference, etc. Hopping turns the consecutive long time interference of mobile station into discontinuous interference of single burst, and such interference can be greatly lowered through channel decoding, de-interleave and error correction technology. After hopping technology is adopted, GSM … Read more
When using close frequency reuse technique, system interference is the most important factor for frequency reuse ratio. Usually, power control and discontinuous transmission technologies are adopted to lower system interference. To prevent interference and improve system communication quality under the same interference condition, frequency hopping technology is used. Therefore, frequency hopping is a very important … Read more
Multi-layer reuse pattern is a gradual process for TCH frequency planning. In other words, the reuse is rather loose in TCH1 layer and it is quite close in the last TCH layer .The reason for this pattern is that base band hopping is used in the Multi-layer reuse pattern. When there are rather few frequency … Read more
In TCH interval grouping, the three cells of the same BTS use the same HSN while different BTS use different HSN, and different MAIO are used by carriers in the same layer of the same BTS. The HSN of BTS A is 1, the MAIO of two carriers TCH1 and TCH2 in Group 1 cell … Read more
The actual frequency planning of certain areas is usually conducted with such areas divided into segments geographically, i.e., first divide a complex network into small networks. However, there should be some frequency carriers (when the frequency is enough) reserved at the boundary of the segments or the frequency carriers should be divided. Such boundary should … Read more
Isolated reuse technology refers to 1*3 or 1*1 reuse with short reuse distance and severe interferences, radio frequency hopping technology has to be adopted. The aggregate of hopping frequencies needs to be far more larger than the number of TRX (more than twice), MA, HSN and MAIO parameter are used to avoid frequency conflict. Let’s … Read more