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Mobile communication terminal testing apparatus and method of testing mobile communication terminal

A mobile communication terminal and testing device technology, applied in transmission monitoring, electrical components, transmission systems, etc., can solve problems such as the inability to show the tester the value of EVM and the inability to analyze it.

Active Publication Date: 2014-07-02
ANRITSU CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0012] However, in the conventional mobile communication terminal testing device, since the average value of EVM for 16 time periods is collectively calculated, there is a problem that it is not possible to show the tester the value of EVM for each time period.
Therefore, in the conventional mobile communication terminal test equipment, it is sometimes impossible to perform detailed analysis or discovery of defects in the development stage of the mobile communication terminal or the evaluation stage on the production line, and it is desired to improve this situation.

Method used

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  • Mobile communication terminal testing apparatus and method of testing mobile communication terminal
  • Mobile communication terminal testing apparatus and method of testing mobile communication terminal
  • Mobile communication terminal testing apparatus and method of testing mobile communication terminal

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Embodiment Construction

[0040] First, before describing the embodiments of the present invention, a test mode for EVM measurement in LTE (hereinafter referred to as "EVM test mode") specified in "3GPP TS 36.521-16.5.2.1A" will be described.

[0041] Such as figure 1 As shown, the EVM test mode is defined in 1 frame. 1 frame includes 10 subframes (subframes 0 to 9). Each subframe includes 2 time slots. That is, 1 frame is constituted by 20 time slots of time slots 0 to 19 .

[0042] For example, when the frequency bandwidth of the channel is 10 MHz, each of the 20 time slots has an area in which 50 RBs can be allocated in the direction of the frequency axis. Among these time slots, a predetermined number of RBs are allocated to time slots 4 to 7 and 14 to 17 indicated by oblique lines. Therefore, in the EVM test mode, areas indicated by slanted lines are allocated areas, and other areas are non-allocated areas.

[0043] Time periods 4~7, 14~17 are allocated with figure 2 The number of RBs show...

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Abstract

The invention provides a mobile communication terminal testing device and a mobile communication terminal testing method capable of displaying EVM according to each time period. The mobile communication terminal testing device (1) has: a receiving unit (12), which receives a radio frequency transmission signal from the mobile communication terminal (2) and converts it into a baseband signal, and outputs the baseband signal as a digitally valued received signal; an EVM measurement circuit ( 22), measuring the modulation accuracy of each symbol contained in the received signal; the time period selection part (32), selecting at least one of a plurality of time periods; and the display part (43), displaying the time period selection part (32) EVM for each symbol contained in the selected time period.

Description

technical field [0001] The invention relates to a mobile communication terminal testing device and a mobile communication terminal testing method for testing mobile communication terminals such as mobile phones or portable terminals. Background technique [0002] Conventionally, as such a mobile communication terminal testing device, for example, a device disclosed in Patent Document 1 is known. This mobile communication terminal testing device has a transmitting circuit for transmitting signals to the mobile communication terminal and a receiving circuit for receiving signals from the mobile communication terminal, and operates as a virtual base station for transmitting and receiving signals to the mobile communication terminal to test the mobile communication terminal structure. In Patent Document 1, there are descriptions of a code division multiple access (CDMA: Code Division Multiple Access) method or a wideband code division multiple access (W-CDMA: Wideband-Code Divi...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04B17/00
CPCH04B17/0065H04B17/23
Inventor 井上直树
Owner ANRITSU CORP