JP6043390B2 - Mobile terminal test system - Google Patents

Description

  The present invention relates to a technique for easily specifying a location where a packet loss occurs when performing a throughput test on a mobile terminal.

  When measuring throughput (downlink) for a mobile terminal, packet data is transmitted from the test system, and a packet including an acknowledgment message sent from the mobile terminal that received the packet data is received and transmitted. Throughput, which is the amount of data per unit time, is obtained from the time difference from timing to reception of the ACK message and the number of packets confirmed to be received, and this change in throughput is displayed in a graph, for example.

  A technique for performing a throughput test on a mobile terminal as described above and displaying a graph of the obtained throughput is disclosed in Patent Document 1.

International Publication W02008 / 0965551

  The throughput obtained in the above test changes due to the delay caused by data processing inside the test system and inside the mobile terminal, but the loss of the packet itself (packet loss) inside the test system and inside the mobile terminal. ), Packet re-transmission processing is performed, and the throughput is greatly reduced.

  This change in throughput can be recognized from the displayed graph, but the change factor of the throughput cannot be specified from the graph.

  However, since the conventional test system has a log function for storing packet transfer history between layers in the test system together with time information, when the user recognizes a change in throughput in the displayed graph, The packet transfer history stored in the log function must be checked to find out at which processing stage the packet loss occurred, and it took time to identify the location where the packet loss occurred.

  An object of the present invention is to solve this problem and to provide a mobile terminal test system that can easily identify the location where a packet loss occurs.

In order to achieve the above object, a mobile terminal test system according to claim 1 of the present invention comprises:
A communication processing unit (21) that performs communication simulating a base station with a mobile terminal to be tested;
A display (22);
An operation unit (23);
Packet transmission means (31) for transmitting packet data to be used for a throughput test to the mobile terminal via the communication processing unit, and reception received from the mobile terminal for the packet data transmitted by the packet transmission means Packet receiving means (32) for receiving a packet including a confirmation message, and time difference measuring means for measuring a time difference from when the packet transmitting means transmits packet data until the packet receiving means receives a packet including an acknowledgment message (33), a throughput calculating means (34) for calculating the throughput from the time difference measured by the time difference measuring means and the number of packets confirmed to be received, and a throughput display means (35) for displaying the throughput calculated by the throughput calculating means in a graph. ), Layers in the test system The packet transfer status is monitored based on the sequence number of the packet, the packet transfer monitoring means (36) for storing the history information together with the time information, and the history information stored by the packet transfer monitoring means is displayed on the display section. In a mobile terminal test system comprising a test control unit (30) having a packet transfer history display means (37),
In the test control unit,
A packet loss detecting means (41) for detecting a timing at which a jump occurs in the sequence number of the packet monitored by the packet transfer monitoring means as a packet loss occurrence timing;
The position where the graph displayed by the throughput display means first decreases and changes after the packet loss occurrence timing detected by the packet loss detection means is the position where the throughput is reduced due to the occurrence of the packet loss. And a packet loss mark display means (42) for displaying a mark indicating the position in a state that can be designated by an operation on the operation unit,
The packet transfer history display means, when the mark is designated by the operation of the operation unit by the user, from the history information stored in the packet transfer monitoring means, the occurrence timing of the packet loss before the mark position The history information of the time zone including is extracted and displayed on the display unit.

  Since the mobile terminal test apparatus of the present invention is configured as described above, if a packet loss occurs in the test system during the throughput test, a mark indicating the position where the throughput decreases due to the packet loss is indicated. When the mark is displayed on the throughput graph and the user designates this mark, the time zone including the packet loss occurrence timing corresponding to the designated mark is obtained from the packet forwarding history information stored by the packet forwarding monitoring means. The history information is extracted and displayed on the display unit.

  For this reason, the user can easily recognize from the displayed mark that the packet loss has occurred during the throughput test and the change in the throughput graph due to the packet loss, and if the mark is specified on the operation unit, Since transfer history information in a time zone including the timing at which the packet loss occurs is displayed, it is possible to specify between which layers in the test system the packet loss has occurred. If it is found that packet loss has occurred in the test system in this way, it can be determined whether the variation in the throughput test result is due to the mobile terminal or the test system itself.

The figure which shows the structure of embodiment of this invention The figure which shows an example of the display screen of the throughput test result of embodiment The figure which shows an example of the display screen of the transfer history information including packet loss occurrence timing

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
FIG. 1 shows the configuration of a mobile terminal test system 20 to which the present invention is applied.

  The mobile terminal test system 20 includes a communication processing unit 21, a display unit 22, an operation unit 23, and a test control unit 30.

  The communication processing unit 21 includes a so-called pseudo base station apparatus that performs communication simulating a base station with the mobile terminal 1 to be tested. An actual pseudo base station apparatus performs complicated modulation / demodulation processing, frequency conversion processing, and the like corresponding to various communication schemes. In brief, a link is formed with the mobile terminal 1 to be tested. The high-frequency signal transmitted from the mobile terminal 1 is received from the test control unit 30 and is subjected to modulation processing according to the communication method of the mobile terminal 1, converted into a high-frequency signal and transmitted. Is received and demodulated, and the obtained data is given to the test control unit 30.

  The communication processing unit 21 sequentially converts input baseband packet data into a higher layer according to a predetermined protocol, converts the data into frame signals determined by a communication method, The frame signal is subjected to modulation processing and frequency conversion processing and transmitted, the signal transmitted from the mobile terminal 1 is subjected to frequency conversion processing and demodulation processing, and further converted to lower layers sequentially. Baseband packet data is obtained.

  The display unit 22 is for displaying various information and measurement results necessary for the test of the mobile terminal 1, and the operation unit 23 is for setting various parameters necessary for the test by the user. is there.

  The test control unit 30 exchanges data with the mobile terminal 1 to be tested via the communication processing unit 21, and performs various processes necessary for the test of the mobile terminal 1. The communication processing unit In some cases, the communication processing unit 21 and a separate control device, for example, a personal computer may be used.

  The test control unit 30 is configured to perform very many types of measurements on the mobile terminal. Here, a configuration for performing a throughput test of the mobile terminal 1 will be described. Note that the throughput test result performed by the test control unit 30 includes an element of a delay time (such as a delay time of the communication processing unit 21) necessary for packet transfer of the entire test system.

  The packet transmission unit 31 of the test control unit 30 transmits packet data used for the throughput test to the mobile terminal 1 via the communication processing unit 21. As this packet data, a plurality of (for example, 128, 256, etc.) packets having a 128-byte configuration are sent together, and information on a unique sequence number (packet number) is given to the plurality of packets. It shall be.

  The packet receiving unit 32 receives a packet including an acknowledgment message (hereinafter referred to as an ACK message) returned from the mobile terminal 1 with respect to the packet data transmitted by the packet transmitting unit 31.

  The time difference measuring unit 33 measures a time difference RTT from when the packet transmitting unit 31 transmits packet data until the packet receiving unit 32 receives a packet including an ACK message. It is assumed that the ACK message includes the sequence number of the packet that has been confirmed to be received.

  The throughput calculating unit 34 sequentially calculates the throughput TP (i) (unit is bps) based on the time difference RTT (i) measured by the time difference measuring unit 33 and the number of packets Pr (i) confirmed to be received by the ACK message. To do.

This calculation is
TP (i) = Pr (i) × 128 × 8 / RTT (i)
It becomes. Here, i represents the number of measurements.

  The throughput display means 35 displays the throughput calculated by the throughput calculation means 34 on the display unit 22 as a graph, for example, as shown in FIG. This display form is arbitrary, and in addition to the method of displaying the value of the sequentially calculated throughput TP (i) in the memory while displaying it on the graph of the horizontal axis time, the stage where a predetermined number of measurements are completed May be displayed all at once.

  The packet transfer monitoring unit 36 monitors the packet transfer status between layers in the test system configured by the test control unit 30 and the communication processing unit 21 based on the sequence number of the packet, and stores the history information together with the time information. . For example, packet data output from the test control unit 30 is input to the communication processing unit 21 as a physical layer signal, and is sequentially converted to an upper layer (MAC layer → RLC layer → PDCP layer) and transmitted to the mobile terminal 1. Then, the signal from the mobile terminal 1 is sequentially converted from the upper layer to the lower layer signal in the communication processing unit 21, and finally the physical layer packet data is output to the test control unit 30. .

  The packet transfer monitoring means 36 monitors the transfer status of this packet data between layers and stores the history information. The history information may include the packet sequence number.

  The packet transfer history display unit 37 is for displaying the packet transfer history stored by the packet transfer monitoring unit 36 on the display unit 22. Basically, the display unit 22 performs a specific operation on the operation unit 23. The packet transfer history display means 37 of this embodiment is configured to be described later, as shown in FIG. The packet transfer history in the time zone including the occurrence timing of the packet loss is extracted and automatically displayed on the display unit 22.

  Although the above configuration requirements are also included in the conventional apparatus, the test control unit 30 of the mobile terminal test system 20 of the present embodiment includes a packet loss detection unit 41 and a packet loss mark display unit in addition to the above configuration requirements. 42 is provided.

  The packet loss detection unit 41 checks the continuity of the sequence numbers of the packets monitored by the packet transfer monitoring unit 36, determines that a packet loss has occurred when a jump occurs in the sequence number, and determines the time information as the packet loss. Is stored as the occurrence timing Tloss. Here, for the packet transmitted to the mobile terminal 1, the continuity of the sequence numbers given by the packet transmitting means 21 is checked to determine whether there is a loss, and the packet transmitted from the mobile terminal 1 is determined. Checks the continuity of sequence numbers included in the receipt confirmation message to determine whether there is a loss. The packet sequence number may be stored together with the time information as the packet loss occurrence timing Tloss.

  When a packet loss occurs in the test system or in the mobile terminal 1, a receipt confirmation message for the transmitted packet is not received even after a predetermined time has elapsed. The packet transmitting unit 31 that has received this information from the packet receiving unit 32 retransmits the packet that has not been acknowledged. However, since the number of packets that have been acknowledged decreases due to this packet loss, the calculated value of the throughput decreases. As shown in FIG. 2, the throughput graph decreases sharply at time Ta. Note that the timing Ta at which the graph of throughput due to the packet loss decreases is delayed from the actual packet loss occurrence timing Tloss.

  The packet loss mark display means 42 displays a mark indicating that a packet loss has occurred on the throughput graph displayed by the throughput display means 35 in a state that can be designated by an operation on the operation unit 23. The shape of this mark is arbitrary, but for example, as shown in FIG. 2, on the time axis of the throughput graph, at the time position Ta where the throughput sharply decreases due to packet loss. Indicated by a triangle mark. As described above, the timing Ta at which the throughput graph decreases and changes with respect to the timing Tloss when the packet loss actually occurs is delayed, but the mark display position is first after the time Tloss when the packet loss occurs. What is necessary is just to match with the timing Ta at which the change decreases sharply.

  When this mark is displayed, if the user operates the operation unit 23 and designates the mark (for example, clicks the mouse cursor on the mark), the packet transfer history display means 37 is activated, and so on. The history information in the time zone including the packet loss occurrence timing Tloss corresponding to the mark is extracted from the history information stored in and displayed on the display unit 22. In the case where a sequence number is stored together with time information in the history information and packet loss occurrence timing Tloss, the history information may be extracted using the sequence number.

  FIG. 3 shows an example of the display. A number field indicating each processing order, each layer field, a data type field, a time field, and the like are provided in order from the left, and the transfer direction between layers is indicated by an arrow. . In this example, ten transfer histories from T (n-5) to T (n + 4) including packet loss occurrence timing Tloss = T (n) are displayed, and the transmission packet is the physical layer of the lowest layer. The state in which the packets are sequentially transferred from the layer (PHY) to the PDCP layer of the highest layer and the packet from the terminal (TE) is transferred from the highest layer to the lowest layer is indicated by arrows. Then, it is possible to identify that the packet loss is generated at the transfer stage from the PDCP layer to the PLC layer by the black-and-white reversal display or the color-coded display (shown by hatching in FIG. 3). When the history information includes a packet sequence number, a sequence number field may be provided to display the packet sequence number.

  As described above, in the mobile terminal test system 20 according to the embodiment, when a packet loss occurs in the test system during the throughput test, the generation timing is stored, and the throughput graph is displayed. When a mark indicating the position where the throughput decreases due to the packet loss is displayed on the graph, and the user designates this mark, the designation is made from the packet transfer history information stored by the packet transfer monitoring means 36. The history information of the time zone including the occurrence timing of the packet loss corresponding to the operated mark is extracted and displayed on the display unit 22.

  For this reason, the user can easily recognize from the displayed mark that the packet loss has occurred during the throughput test and the change in the throughput graph due to the packet loss. Since the transfer history information for the time period including the timing at which the packet loss occurs is displayed, it is possible to specify between which layers in the test system the packet loss has occurred. In addition, if it is known that packet loss has occurred in the test system, it can be easily determined whether the variation in the throughput test result is caused by the mobile terminal or the test system itself.

  DESCRIPTION OF SYMBOLS 1 ... Mobile terminal, 20 ... Mobile terminal test system, 21 ... Communication processing part, 22 ... Display part, 23 ... Operation part, 30 ... Test control part, 31 ... Packet transmission means, 32 ...... Packet receiving means, 33 ...... Time difference measuring means, 34 ...... Throughput calculating means, 35 ...... Throughput display means, 36 ...... Packet transfer monitoring means, 37 ...... Packet transfer history display means, 41 ...... Packet loss detection Means, 42 ... Packet loss mark display means

Claims (1)

A communication processing unit (21) that performs communication simulating a base station with a mobile terminal to be tested;
A display (22);
An operation unit (23);
Packet transmission means (31) for transmitting packet data to be used for a throughput test to the mobile terminal via the communication processing unit, and reception received from the mobile terminal for the packet data transmitted by the packet transmission means Packet receiving means (32) for receiving a packet including a confirmation message, and time difference measuring means for measuring a time difference from when the packet transmitting means transmits packet data until the packet receiving means receives a packet including an acknowledgment message (33), a throughput calculating means (34) for calculating the throughput from the time difference measured by the time difference measuring means and the number of packets confirmed to be received, and a throughput display means (35) for displaying the throughput calculated by the throughput calculating means in a graph. ), Layers in the test system The packet transfer status is monitored based on the sequence number of the packet, the packet transfer monitoring means (36) for storing the history information together with the time information, and the history information stored by the packet transfer monitoring means is displayed on the display section. In a mobile terminal test system comprising a test control unit (30) having a packet transfer history display means (37),
In the test control unit,
A packet loss detecting means (41) for detecting a timing at which a jump occurs in the sequence number of the packet monitored by the packet transfer monitoring means as a packet loss occurrence timing;
The position where the graph displayed by the throughput display means first decreases and changes after the packet loss occurrence timing detected by the packet loss detection means is the position where the throughput is reduced due to the occurrence of the packet loss. And a packet loss mark display means (42) for displaying a mark indicating the position in a state that can be designated by an operation on the operation unit,
The packet transfer history display means, when the mark is designated by the operation of the operation unit by the user, from the history information stored in the packet transfer monitoring means, the occurrence timing of the packet loss before the mark position The mobile terminal test system characterized by extracting history information of a time zone including and displaying on the display unit.

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