High quality recharge service

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Technical details in mobile communication

Signals are transmitted from a discrete number of locations to all mobiles within the geographical area. The issuance to the terminals within the same cell is made from the base station simultaneously in time, on the same bandwidth. Thus, the path for the useful signal to a mobile is the same as that followed by the rest of mobile recharge signals sent to other phones. That is, looking at a communication specifically useful signal and interfering signal from the same base station decay at the same rate.

This means that the signal to interference remains invariant at any point within the cell. That is why, in the ideal case of solitary confinement, assuming no thermal noise additive to interference, it would be fastest api service provider necessary to implement any control power In practice, the cells are surrounded by other cells that operate on the same frequency band !. Therefore, as a terminal moves away from the base station has a downward component interfering signal its own base station and a signal component interference from other mobile recharge base stations is increasing. In the worst point, when the mobile terminal is within the limits of a cell, it receives much interference signal of its own base station and base station in the adjacent cell.

In the worst point, considering only propagation loss, it is observed that the degradation of the signal to interference with the most favorable case is aproximat damente 6 dB, as a result of counting the interference of the two adjacent base stations. The best case is that in which the mobile terminal is very close to its base station and thus mobile recharge the interference of its own base station is dominant. Therefore, for down link it is also necessary to implement a power control to ensure the same quality of service for all phones, regardless of their location within the cell. Operating margin power control is not in any event as large as for the up link, which spoke margin of about 80 dB.

For the down link speech is normally margin of about 20 dB. The justification to operate with a margin of 20 dB is to consider not only the propagation losses, but losses slow fading and multiparty effect. Thus, in the case of mobile terminal next to cell boundaries, a disadvantage is mobile recharge that in which the signal from the base station is subject to a deep fade, which affects both the useful signal and the interfering. But the interfering signal from the neighboring cell does not need to be subject to the same fading, causing a noticeable degradation in the signal fastest api service provider to interference communication.

The transfer of call, generically, is switching from the base station to the mobile terminal contact. However, there are several ways to CDMA base station switching, which leads to different forms of hand off that are discussed below. For the first generation systems a hand off necessarily imply a change of the carrier fastest api service provider used with the old base station, going to tune in to another carrier frequency belonging to the group using the new base station. Hence, the nickname of mobile recharge hard handover because at some point the connection with the previous base station stops to then resume for another channel with the new base station, this is because the mobile terminals can only tune to a frequency simultaneously.
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