JP2006054779A - Radio base station test system - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a radio base station test system, capable of measuring the transmission delay of data at an incoming transmission and an outgoing transmission in a communication via a radio base station apparatus. <P>SOLUTION: The radio base station test system comprises a dummy radio terminal 2 emulating radio terminal; and a dummy radio network controller 3 for emulating radio network controller for controlling the communications via the radio base station device 1. The dummy radio terminal 2 has a time information grant section for granting time information to data at a lowermost protocol layer common to radio communications and cable communications in protocols used for the communications of data transmitted, through the radio base station device 1, to the dummy radio network controller 3. The dummy radio network controller 3 has: a time information extracting section for extracting the time information from the data transmitted by the dummy radio terminal 2; and a transmission delay measuring section for measuring the transmission delay in the data generated on a line from the dummy radio terminal 2 up to the dummy radio network controller 3, based on the time information. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a radio base station test system for testing a radio base station apparatus installed in a base station for radio communication by a radio terminal apparatus such as a mobile phone, and more specifically, in communication via a radio base station apparatus, The present invention relates to a radio base station test system that measures a transmission delay of data generated with a radio network controller.

Conventionally, for measuring transmission delay, for example, time stamps are continuously generated at a predetermined timing, and the generated time stamps are assigned to a plurality of ATM cells, respectively, and a plurality of ATM cells to which time stamps are attached. Is transmitted to the system under test, the ATM cell fed back from the system under test is received, the time stamp is detected from the received ATM cell, and the detected time stamp and the time stamp at the time when the ATM cell is received, There is known an ATM cell transfer delay measuring device for obtaining a transfer delay time of an ATM cell (see, for example, Patent Document 1).
Japanese Patent Laid-Open No. 10-271119

  However, in the conventional ATM cell transfer delay measuring device, when measuring the data transmission delay in the communication through the wireless base station device that performs wireless communication with the wireless terminal device and wired communication with the wireless network control device, There has been a problem that it is impossible to measure the transmission delay of data generated from the terminal device to the wireless network control device and the transmission delay of data generated from the wireless network control device to the wireless terminal device.

  The present invention has been made in order to solve the conventional problems. When measuring a data transmission delay in communication via a radio base station apparatus, data transmission occurring from the radio terminal apparatus to the radio network control apparatus is performed. It is an object of the present invention to provide a radio base station test system capable of measuring a delay and a transmission delay of data generated from a radio network control apparatus to a radio terminal apparatus.

  The wireless base station test system of the present invention includes a pseudo wireless terminal device (2) that emulates a wireless terminal device that performs communication via the wireless base station device by wirelessly communicating with the wireless base station device (1), A pseudo wireless network control device (3) that emulates a wireless network control device that controls communication via the wireless base station device by wired communication with the wireless base station device, the pseudo wireless terminal device comprising: Of the protocols used for communication of data transmitted to the pseudo wireless network control device via the wireless base station device, time information is added to the data in the lowest protocol layer common to the wireless communication and the wired communication. A time information adding unit (14) for providing the pseudo wireless network control device, wherein the pseudo wireless network control device is transmitted by the pseudo wireless terminal device. A time information extraction unit (25) for extracting time information from the extracted data, and a transmission delay of data generated from the pseudo wireless terminal device to the pseudo wireless network control device based on the time information extracted by the time information extraction And a transmission delay measuring unit (26) for measuring.

  With this configuration, in order to add time information to data in the lowest protocol layer common to wireless communication and wired communication, when measuring a data transmission delay in communication via a wireless base station device, the wireless terminal device It is possible to measure the transmission delay of data generated up to the wireless network control device.

  The radio base station test system of the present invention further includes a management device (4) for managing the pseudo radio terminal device and the pseudo radio network control device, and the management device communicates data to which the time information is added. A channel allocating unit for allocating a channel designated by the management device for communication of data to which time information is given by the time information giving unit; The time information extraction unit may extract the time information from communication data assigned to a channel designated by the management device.

  With this configuration, by assigning a dedicated channel for communication of data to which time information is added, transmission / reception of data to which time information is added can be prevented from being affected by transmission / reception of other data, and data transmission The measurement accuracy of delay can be improved.

  Further, the radio base station test system of the present invention is a pseudo radio terminal apparatus (2) that emulates a radio terminal apparatus that performs communication via the radio base station apparatus by performing radio communication with the radio base station apparatus (1). And a pseudo radio network control device (3) for emulating a radio network control device for controlling communication via the radio base station device by wired communication with the radio base station device, the pseudo radio network control The device transmits data to a time at a lowest protocol layer common to the wireless communication and the wired communication among protocols used for communication of data transmitted to the pseudo wireless terminal device via the wireless base station device. A time information adding unit (24) for adding information, wherein the pseudo wireless terminal device is controlled by the pseudo wireless network control device. A time information extracting unit (15) for extracting time information from the transmitted data, and data generated from the pseudo wireless network control device to the pseudo wireless terminal device based on the time information extracted by the time information extracting unit And a transmission delay measuring unit (16) for measuring the transmission delay of the transmission.

  With this configuration, in order to add time information to data in the lowest protocol layer common to wireless communication and wired communication, when measuring a data transmission delay in communication via a wireless base station device, the wireless network control device The transmission delay of data generated from the wireless terminal device to the wireless terminal device can be measured.

  The radio base station test system of the present invention further includes a management device (4) for managing the pseudo radio terminal device and the pseudo radio network control device, and the management device communicates data to which the time information is added. A dedicated channel to be assigned for use, and the pseudo wireless network control device assigns a channel designated by the management device for communication of data to which time information is given by the time information giving unit (22 And the time information extraction unit may extract the time information from communication data assigned to a channel designated by the management device.

  With this configuration, by assigning a dedicated channel for communication of data to which time information is added, transmission / reception of data to which time information is added can be prevented from being affected by transmission / reception of other data, and data transmission The measurement accuracy of delay can be improved.

  Further, the wireless base station test method of the present invention includes a pseudo wireless terminal device (2) that emulates a wireless terminal device that performs communication via the wireless base station device by wirelessly communicating with the wireless base station device (1). And a pseudo wireless network control device (3) for emulating a wireless network control device for controlling communication via the wireless base station device by wired communication with the wireless base station device. In the radio base station test method for testing the radio base station apparatus, the pseudo radio terminal apparatus is used for communication of data transmitted to the pseudo radio network control apparatus via the radio base station apparatus. Time information is attached to the data at the lowest protocol layer common to the wireless communication and the wired communication, In the pseudo wireless network control device, time information is extracted from data transmitted by the pseudo wireless terminal device, and transmission delay of data generated from the pseudo wireless terminal device to the pseudo wireless network control device based on the extracted time information Measure.

  This method gives time information to data in the lowest protocol layer common to wireless communication and wired communication. Therefore, when measuring a data transmission delay in communication via a wireless base station device, the wireless terminal device It is possible to measure the transmission delay of data generated up to the wireless network control device.

  Further, the wireless base station test method of the present invention includes a pseudo wireless terminal device (2) that emulates a wireless terminal device that performs communication via the wireless base station device by wirelessly communicating with the wireless base station device (1). And a pseudo wireless network control device (3) for emulating a wireless network control device for controlling communication via the wireless base station device by wired communication with the wireless base station device. In the radio base station test method for testing the radio base station apparatus, the pseudo radio network control apparatus is used for communication of data transmitted to the pseudo radio terminal apparatus via the radio base station apparatus. Time information is attached to the data at the lowest protocol layer common to the wireless communication and the wired communication, In the pseudo wireless terminal device, time information is extracted from the data transmitted by the pseudo wireless network control device, and data transmission delay occurs from the pseudo wireless network control device to the pseudo wireless terminal device based on the extracted time information Measure.

  By this method, time information is added to data in the lowest protocol layer common to wireless communication and wired communication, so that when measuring the transmission delay of data in communication via the wireless base station device, the wireless network control device The transmission delay of data generated from the wireless terminal device to the wireless terminal device can be measured.

  The wireless base station test system of the present invention includes a data transmission delay that occurs from a wireless terminal device to a wireless network control device when measuring a data transmission delay in communication through the wireless base station device, and a wireless network control device. The transmission delay of data generated from the wireless terminal device to the wireless terminal device can be measured.

  Embodiments of the present invention will be described below with reference to the drawings.

  FIG. 1 is a block diagram of a radio base station test system according to an embodiment of the present invention.

  The radio base station test system is a radio terminal apparatus that performs communication via the radio base station apparatus 1 by performing radio communication with the radio base station apparatus 1 installed in a base station (also referred to as “Base Transceiver Station”). (A user equipment, also referred to as “UE”) and a wireless network control device that controls communication via the wireless base station device 1 by wired communication with the wireless base station device 1 Radio network controller (also referred to as “RNC”)), and a radio base station apparatus 1 including a pseudo radio terminal apparatus 2 and a management apparatus 4 that manages the pseudo radio network control apparatus 3. As a device to be measured, a data transmission delay occurring between the pseudo wireless terminal device 2 and the pseudo wireless network control device 3 is measured. That.

  The management device 4 is configured by a personal computer device or the like, and is connected to the pseudo wireless terminal device 2 and the pseudo wireless network control device 3 through a communication path 5 such as Ethernet (registered trademark).

  For example, the management device 4 instructs the start of measurement of the transmission delay of data generated between the pseudo wireless terminal device 2 and the pseudo wireless network control device 3 according to the input operation of the operator, The channel assigned for communication is specified.

  FIG. 2 is a block diagram of the pseudo wireless terminal device 2.

  The pseudo wireless terminal device 2 is generated by a wireless communication unit 10 that wirelessly communicates with the wireless base station device 1, a transmission data generation unit 11 that generates data to be transmitted via the wireless communication unit 10, and a transmission data generation unit 11. A channel allocation unit 12 for allocating channels for data communication, a time information generation unit 13 for generating time information indicating the current time, a time information addition unit 14 for adding time information to data, and a pseudo wireless network control device 3, the time information extracting unit 15 that extracts time information from the data received by the wireless communication unit 10, and the pseudo wireless network control device 3 based on the time information extracted by the time information extracting unit 15. Based on a transmission delay measuring unit 16 that measures a transmission delay of data generated up to the terminal device 2, an instruction from the management device 4, and the like. And a control unit 17 that controls each unit constituting the pseudo radio terminal apparatus 2 Te.

  The radio communication unit 10 is configured by a radio communication interface module or the like, and transmits data to the pseudo radio network control device 3 by receiving radio communication with the radio base station device 1 or receives data from the pseudo radio network control device 3. It has come to be.

  Here, a protocol configuration used for communication of data transmitted and received by the wireless communication unit 10 will be described with reference to FIG. FIG. 3 is a diagram illustrating an example of a protocol stack for communication of data transmitted / received between the pseudo wireless terminal device 2 and the pseudo wireless network control device 3 via the wireless base station device 1.

  Protocols used in wireless communication between the pseudo wireless terminal device 2 and the wireless base station device 1 are IP (Internet Protocol), PPP (Point-to-Point Protocol), PDCP (Packet Data Convergence Protocol), RLC from the upper level. (Radio Link Control), MAC / Mac-d (Medium Access Control or Medium Access Control-dedicated transport channel), Null / Mac-hs (unused or Medium Access Control-high speed downlink shared channel), PHY (Physical layer) It is comprised by each protocol layer. Note that RRC (Radio Resource Control) is a layer for control data.

  On the other hand, protocols used in wired communication between the pseudo wireless network control device 3 and the wireless base station device 1 are IP, PPP, PDCP, RLC, MAC / Mac-d, Iub Frame Protocol, AAL2 (ATM Adaptation) from the upper level. Layer 2), ATM (Asynchronous Transfer Mode), and L1 (Layer 1) protocol layers.

  That is, between the pseudo wireless terminal device 2 and the pseudo wireless network control device 3, the protocol layers of IP, PPP, PDCP, RLC, and MAC / Mac-d from the upper level are set to common protocols for wireless communication and wired communication. The other lower protocol layers comply with the wireless communication protocol and the wired communication protocol, respectively.

  As described above, the radio base station apparatus 1 transparently transfers a protocol layer compliant with a common protocol in wireless communication and wired communication, and mutually communicates lower protocol layers compliant with the wireless communication and wired communication protocols. Converted and transferred.

  Note that communication of data transmitted / received between the pseudo radio terminal apparatus 2 and the pseudo radio network control apparatus 3 via the radio base station apparatus 1 conforms to the protocol stack example described with reference to FIG. This will be described below.

  Returning to FIG. 2, the transmission data generation unit 11, the channel allocation unit 12, the time information generation unit 13, the time information addition unit 14, the time information extraction unit 15, the transmission delay measurement unit 16, and the control unit 17 are configured by an FPGA (Field Programmable). Each is configured by a gate array (DSP), a digital signal processor (DSP), or a central processing unit (CPU).

  The channel allocation unit 12 allocates a channel for communication of each data generated by the transmission data generation unit 11 and allocates a dedicated channel designated by the management device 4 for communication of data to which time information is given. It has become.

  In this way, by allocating a dedicated channel for communication of data to which time information is added, transmission / reception of data to which time information is added can be prevented from being affected by transmission / reception of other data. The measurement accuracy of delay can be improved. The channel in the present embodiment refers to a channel in the MAC / Mac-d protocol layer (hereinafter simply referred to as “Mac layer”).

  The time information generation unit 13 generates time information based on the time synchronized with the pseudo wireless network control device 3. For example, the time information generation unit 13 may measure the time based on a signal for time synchronization received from a dedicated line connected with the pseudo wireless network control device 3, and a global positioning system (Global Positioning System, It is also possible to measure the time by configuring with “GPS”.

  The time information adding unit 14 adds time information to data in the lowest protocol layer common to wireless communication and wired communication, that is, the MAC layer, for communication in a channel designated by the management device 4 and assigned exclusively. It comes to grant.

  When the time information adding unit 14 adds time information in a protocol layer lower than the Mac layer, it is difficult to extract time information on the side of the pseudo wireless network control device 3 due to a difference in the protocol to be complied with. Thus, when time information is given in a protocol layer higher than the MAC layer, transmission delay measurement becomes inaccurate due to transmission control such as overhead and retransmission during protocol conversion.

  The time information extraction unit 15 is a channel designated by the management device 4 and allocated exclusively for the data transmitted from the pseudo wireless network control device 3 via the wireless base station device 1 and received by the wireless communication unit 10. The time information given in the MAC layer to the communication data in is extracted.

  The transmission delay measurement unit 16 performs pseudo-simulation from the pseudo wireless network control device 3 based on the difference between the time represented by the time information extracted by the time information extraction unit 15 and the current time represented by the time information generated by the time information generation unit 13. The transmission delay of data generated up to the wireless terminal device 2 is measured.

  Information representing the transmission delay measured by the transmission delay measurement unit 16 is transmitted to the management device 4 via the control unit 17 and displayed via a display device provided in the management device 4, for example.

  Here, an example of the display result of the transmission delay displayed on the display device provided in the management device 4 is shown in FIG. FIG. 4 shows a histogram of the number of frames in which a transmission delay corresponding to each step of a predetermined delay time has occurred, the horizontal axis indicates the delay time, and the vertical axis indicates a transmission delay corresponding to each delay time. Represents the number of frames. In the management device 4, the start time and delay time steps on the horizontal axis may be changed.

  FIG. 5 is a block diagram of the pseudo wireless network control device 3.

  The pseudo wireless network control device 3 is generated by a wired communication unit 20 that performs wired communication with the wireless base station device 1, a transmission data generation unit 21 that generates data to be transmitted via the wired communication unit 20, and a transmission data generation unit 21. A channel allocating unit 22 for allocating a channel for communication of the received data, a time information generating unit 23 for generating time information indicating the current time, a time information adding unit 24 for adding time information to data, and a pseudo wireless terminal device 2, a time information extraction unit 25 that extracts time information from data received by the wired communication unit 20, and a pseudo wireless network from the pseudo wireless terminal device 2 based on the time information extracted by the time information extraction unit 25. Based on a transmission delay measuring unit 26 that measures the transmission delay of data generated up to the control device 3, an instruction from the management device 4, and the like. And a control unit 27 for controlling the components constituting the pseudo radio network controller 3 Te.

  The wired communication unit 20 is configured by a wired communication interface module or the like, and transmits data to the pseudo wireless terminal device 2 or receives data from the pseudo wireless terminal device 2 by performing wired communication with the wireless base station device 1. It is like that.

  Here, the transmission data generation unit 21, the channel allocation unit 22, the time information generation unit 23, the time information addition unit 24, the time information extraction unit 25, the transmission delay measurement unit 26, and the control unit 27 are connected to the pseudo wireless terminal device 2. Since the transmission data generation unit 11, the channel allocation unit 12, the time information generation unit 13, the time information addition unit 14, the time information extraction unit 15, the transmission delay measurement unit 16, and the control unit 17 are configured in the same manner. The detailed explanation is omitted.

  The operation of the radio base station test system configured as described above will be described with reference to FIG. The operation of the radio base station test system described below starts when the management apparatus 4 is instructed to start measuring the transmission delay of data generated from the pseudo radio terminal apparatus 2 to the pseudo radio network control apparatus 3.

  First, in the pseudo radio terminal apparatus 2, generation of data to be transmitted to the pseudo radio network control apparatus 3 is started by the transmission data generation unit 11 (S1), and a channel is assigned by the channel allocation unit 12 for communication of the generated data. Assigned.

  Here, when the channel allocated for data communication is a dedicated channel designated by the management device 4 (S2), the time information generated by the time information generation unit 13 is changed to the time information addition unit 14. Is added to the data in the Mac hierarchy (S4).

  The data generated by the transmission data generation unit 11 is wirelessly transmitted to the wireless base station device 1 by the wireless communication unit 10 (S5), and the protocol for wireless communication in the wireless base station device 1 is changed to the protocol for wired communication. Protocol conversion for conversion is performed (S6), and wired transmission is performed to the pseudo wireless network control device 3 (S7).

  In the pseudo wireless network control device 3, when the dedicated channel designated by the management device 4 is a channel to which communication of data received by the wired communication unit 20 is assigned (S8), a time information extraction unit in the Mac hierarchy 25, time information is extracted from the data (S9). Based on the extracted time information and the time information indicating the current time generated by the time information generation unit 23, the pseudo wireless terminal device 2 to the pseudo wireless network control device 3 The transmission delay of the data that occurs until then is measured by the transmission delay measuring unit 26 (S10).

  The measurement result by the transmission delay measuring unit 26 is transmitted to the management device 4 via the control unit 17 and displayed via a display device or the like provided in the management device 4 (S11). If the management device 4 has instructed the end of transmission delay measurement (S12), the operation of the radio base station test system has ended, and the management device 4 has not instructed to end the measurement of transmission delay. In (S12), the operation of the radio base station test system returns to step S1.

  The operation for measuring the transmission delay of data generated from the pseudo radio terminal apparatus 2 to the pseudo radio network control apparatus 3 has been described above. However, the data transmission delay generated from the pseudo radio network control apparatus 3 to the pseudo radio terminal apparatus 2 is described. Since the operation for measuring the data transmission can be easily performed based on the description of the operation for measuring the transmission delay of data generated from the pseudo wireless terminal device 2 to the pseudo wireless network control device 3, the description thereof will be omitted.

  As described above, according to the radio base station test system according to the embodiment of the present invention, the radio base station provides time information to data in the lowest protocol layer common to radio communication and wired communication. When measuring the data transmission delay in communication via the device 1, the data transmission delay that occurs from the wireless terminal device to the wireless network control device and the data transmission delay that occurs from the wireless network control device to the wireless terminal device are: Can be measured.

The block diagram which shows the structure of the radio base station test system which concerns on one embodiment of this invention The block diagram which shows the structure of the pseudo | simulation radio | wireless terminal apparatus which concerns on one embodiment of this invention The figure which shows the example of the protocol stack used for the communication of the data transmitted / received via the wireless base station apparatus between the pseudo radio | wireless terminal apparatus and pseudo radio | wireless network control apparatus which concern on one embodiment of this invention The figure which shows the example of the display result of the transmission delay displayed on the display apparatus provided in the management apparatus which concerns on one embodiment of this invention The block diagram which shows the structure of the pseudo | simulation radio | wireless network control apparatus which concerns on one embodiment of this invention The flowchart which shows operation | movement of the radio base station test system which concerns on one embodiment of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Radio base station apparatus 2 Pseudo radio terminal apparatus 3 Pseudo radio network control apparatus 4 Management apparatus 5 Communication path 10 Wireless communication part 11, 21 Transmission data generation part 12, 22 Channel allocation part 13, 23 Time information generation part 14, 24 Time Information giving unit 15, 25 Time information extracting unit 16, 26 Transmission delay measuring unit 17, 27 Control unit 20 Wired communication unit

Claims (6)

A pseudo wireless terminal device (2) that emulates a wireless terminal device that performs communication via the wireless base station device by wirelessly communicating with the wireless base station device (1);
A pseudo wireless network control device (3) for emulating a wireless network control device for controlling communication via the wireless base station device by wired communication with the wireless base station device;
The pseudo wireless terminal device is the lowest protocol common to the wireless communication and the wired communication among the protocols used for communication of data transmitted to the pseudo wireless network control device via the wireless base station device. A time information adding unit (14) for adding time information to data in a layer;
The pseudo wireless network control device includes a time information extraction unit (25) that extracts time information from data transmitted by the pseudo wireless terminal device;
A transmission delay measuring unit (26) for measuring a transmission delay of data generated from the pseudo wireless terminal device to the pseudo wireless network control device based on the time information extracted by the time information extraction. Wireless base station test system. A management device (4) for managing the pseudo wireless terminal device and the pseudo wireless network control device;
The management device designates a dedicated channel assigned for communication of data to which the time information is attached,
The pseudo wireless terminal device includes a channel assignment unit (12) for assigning a channel designated by the management device for communication of data to which time information is given by the time information giving unit,
2. The radio base station test system according to claim 1, wherein the time information extraction unit extracts the time information from communication data assigned to a channel designated by the management apparatus. A pseudo wireless terminal device (2) that emulates a wireless terminal device that performs communication via the wireless base station device by wirelessly communicating with the wireless base station device (1);
A pseudo wireless network control device (3) for emulating a wireless network control device for controlling communication via the wireless base station device by wired communication with the wireless base station device;
The pseudo wireless network control device is the lowest protocol common to the wireless communication and the wired communication among the protocols used for communication of data transmitted to the pseudo wireless terminal device via the wireless base station device. A time information giving unit (24) for giving time information to data in a layer;
The pseudo wireless terminal device extracts a time information from data transmitted by the pseudo wireless network control device (15),
A transmission delay measuring unit (16) for measuring a transmission delay of data generated from the pseudo wireless network control device to the pseudo wireless terminal device based on the time information extracted by the time information extracting unit; Wireless base station test system. A management device (4) for managing the pseudo wireless terminal device and the pseudo wireless network control device;
The management device designates a dedicated channel assigned for communication of data to which the time information is attached,
The pseudo wireless network control device has a channel assignment unit (22) for assigning a channel designated by the management device for communication of data to which time information is given by the time information giving unit,
4. The radio base station test system according to claim 3, wherein the time information extraction unit extracts the time information from communication data assigned to a channel designated by the management apparatus. A pseudo wireless terminal device (2) that emulates a wireless terminal device that performs communication via the wireless base station device by wirelessly communicating with the wireless base station device (1);
A wireless base station test system comprising: a pseudo wireless network control device (3) that emulates a wireless network control device that controls communication through the wireless base station device by wired communication with the wireless base station device. In the radio base station test method for testing the radio base station apparatus,
Of the protocols used for communication of data transmitted to the pseudo wireless network control device via the wireless base station device in the pseudo wireless terminal device, the lowest protocol common to the wireless communication and the wired communication Add time information to the data in the layer,
In the pseudo wireless network control device, time information is extracted from the data transmitted by the pseudo wireless terminal device, and data is transmitted from the pseudo wireless terminal device to the pseudo wireless network control device based on the extracted time information. A radio base station test method characterized by measuring a delay. A pseudo wireless terminal device (2) that emulates a wireless terminal device that performs communication via the wireless base station device by wirelessly communicating with the wireless base station device (1);
A wireless base station test system comprising: a pseudo wireless network control device (3) that emulates a wireless network control device that controls communication through the wireless base station device by wired communication with the wireless base station device. In the radio base station test method for testing the radio base station apparatus,
Among the protocols used for communication of data transmitted to the pseudo wireless terminal device via the wireless base station device in the pseudo wireless network control device, the lowest protocol common to the wireless communication and the wired communication Add time information to the data in the layer,
In the pseudo wireless terminal device, time information is extracted from the data transmitted by the pseudo wireless network control device, and data is transmitted from the pseudo wireless network control device to the pseudo wireless terminal device based on the extracted time information. A radio base station test method characterized by measuring a delay.

Images