Handover test of mobile terminal

Simulation of the transmission path between the base stations

Application

In mobile communication equipment such as mobile phone, the information should be transferred without breaking off when the transmission path is switched from a base station to next base station (called handover).

This handover test can be simulated using two or more units of MAT800 or MAT810.

Solution

• Since mobile phone goes away from the base station A, the receiving level becomes low gradually, and conversely it becomes high gradually in the base station B. Moreover, there may be an obstacle blocking the radio wave in the middle.
  This simulation is shown in the figure above "Signal generation".
• High-speed programmable attenuators MAT800/810 are electronic type. Since any spike and chattering are not generated when switching, it is the optimum instrument for simulating the change of radio wave in the air.
• The difference and feature from conventional attenuator are shown in the table below.

[Difference and feature from conventional attenuator]

Item	Traditional attenuator	MAT800/810	Remarks
Swiching method	Mechanical	Electronic
Swiching speed	0 to 20ms/point	2μs/point	Great improvement of time resolution
Attenuation step	1dB	0.05dB	Great improvement of amplitude resolution
Spike at swiching	Large spike	No spike	The spike causes the communication error
Proguram memory	Nothing	128ｋword built-in program memory	The air state is stored
Program memory	Nothing	FREE, BURST, GATE Triffer for readout Internal/external readout clock Pause period of readout cycle	Various memory readout function
Software for maiking	Nothing	Making attenuation progrum can be done as easily as maiking arbitrary waveform.	Standard accessory of MAT800/810

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