With the transition of mobile communication from the second generation to the third generation, new technologies are used from time to time, new mobile networks are established from time to time, RF resources are increasingly tight, and various potential sources of interference are presented at an alarming rate from time to time. The existence of these disturbances has a great impact on the operation of mobile networks. As the central issue of network optimization, it becomes more and more important to deal with mobile problems.
Mobile base station churning we apply a network performance indicator to weigh, namely IOI (IOI Interference on idle, after monitoring the churning of idle channels to ensure ideal network function), single time slot IOI > 5 or single transceiver (RTF) IOI > 40, indicating that the cell has churning. High IOI conditions can be divided into two categories: one is the high IOI of a single transceiver (RTF); the other is the high IOI of the whole cell.
1, if the problem is only presented in a single transceiver, the customer can switch the RTF to discern whether it is a hardware problem or a data problem. If the switch IOI will follow the carrier frequency to change the carrier frequency, duplexer and other hardware, if the switch IOI follow RTF, you can correct the frequency to redo the RTF data to solve the problem. 2, if all or more transceivers in the cell problems, this situation is more complex, the need for detailed problem-specific analysis. Community-wide causes of high IOI and disposal methods.
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1, the admission of components on the pathway is faulty or not properly installed or used: SUFR board, backplane, connection lines, etc., change the board and line. It is also worth noting that the second generation SURF2 board does not have a filter at the 0a/1a/2a end, as long as the B end. Can not connect the antenna directly on these ports, only on the B side, otherwise it will form high IOI. 2. abnormal PB or BER will incur high IOI. in accordance with the process of disposing PB and BER, the base station for tuning, power equalization, antenna feed VSWR check.
- access to the cell repeater, tower, indoor scattering and other equipment abnormal will cause high IOI, debugging external equipment, if necessary, change the equipment.
- antenna problems lead to high cell IOI. Cell antenna backwards to check whether the antenna problem.
5, the external environment of the disturbance? Some communication devices can be transmitted at the opposite frequency of our GSM receiver, such as conference best signal jammer. The best way to remove the interference is to use a spectrum analyzer to scan the frequency to find the source of interference.
For example, CDMA signal scrambling.
Poor cell planning or applying the opposite frequency after some changes.
The cell with high IOI is too close. In addition, the frequency of the hopping frequency and the surrounding base station frequency conflict can also form a disturbance, occurring high IOI. need to temporarily close the hopping frequency, and then check whether the IOI target can be related to it. This kind of disturbance can be dealt with by correcting the frequency point.
In short: cell scrambling problem is one of the most common problems of the current base station, which directly affects the quality of network communication. Such a problem is more complex and troublesome to dispose of. Processors need patience and time. Follow the steps step by step to find out. As long as the problem presents itself, only when the problem can be solved.
