JP2005244690A - Virtual field test equipment - Google Patents

Abstract

A field test of a wireless mobile terminal in a virtual field including an infinite number of base stations can be performed using resources of a limited number of common channels and dedicated channels.
A system controller 10 that manages at least a base station arranged in a virtual field and a radio propagation path environment in the virtual field, a common channel that simulates a plurality of base stations that surround a test terminal 14 in the virtual field, and Base station control for controlling a base station that transmits / receives to / from the test terminal 14 using the resources provided by the multiple base station simulation unit 12 under the control of the system control unit 10 and the multiple base station simulation unit 12 that provides dedicated channel resources Radio wave propagation path environment generation for generating and loading a radio wave propagation path environment instructed by the system control unit 10 to a radio signal exchanged between the unit 11 and a base station controlled by the base station control unit 11 and the test terminal 14 Part 13.
[Selection] Figure 1

Description

  The present invention relates to a virtual field test apparatus that performs a field test of a wireless mobile communication system indoors.

  A field test in which an operation test of a wireless mobile terminal is performed outdoors while riding a car or walking in an urban area requires a great deal of labor. Therefore, a technique for efficiently performing a field test indoors has been proposed (for example, Patent Document 1).

Japanese Patent Laid-Open No. 11-186773

  However, a characteristic feature of the cellular radio mobile communication system is that the radio mobile terminal successively switches base stations with which the mobile station communicates by the handover process. In order to perform field tests virtually, innumerable base stations are required in principle.

  The technique described in Patent Document 1 requires as many base station simulating means as the number of base stations that communicate with wireless mobile terminals. For example, in order to perform field tests in an urban area where high-rise buildings are lined up, it is necessary to densely gather base stations with a narrow coverage range in order to ensure communication quality, so that the size of the virtual field test apparatus increases. There is.

  As a result, it is necessary to narrow the range in which the wireless mobile terminal moves and to keep the number of base stations communicating with the wireless mobile terminal within the constraints of the virtual field test apparatus. It is also a factor that reduces the reproducibility of the test.

  The present invention has been made in view of the above, and a virtual field test apparatus capable of performing a field test of a radio mobile terminal in a virtual field including a myriad of base stations using a limited number of common channel and dedicated channel resources The purpose is to obtain.

  In order to achieve the above-described object, a virtual field test apparatus according to the present invention includes at least a system control unit that manages a base station arranged in a virtual field and a radio wave propagation path environment in the virtual field, A plurality of base station simulation units that provide resources for common channels and dedicated channels that simulate a plurality of base stations surrounding the wireless mobile terminal, and resources provided by the plurality of base station simulation units under the control of the system control unit The system control unit instructs a radio signal exchanged between the base station controlled by the base station controller and the base station controlled by the base station control unit and the radio mobile terminal. And a radio wave propagation path environment generation unit for generating and loading a radio wave propagation path environment.

  According to the present invention, the resources of the common channel and the dedicated channel provided by the multiple base station simulator are limited, but can be changed and used according to the base station to be simulated. Field tests of wireless mobile terminals in the field can be performed.

  According to the present invention, it is possible to perform a field test of a wireless mobile terminal in a virtual field including an infinite number of base stations using a limited number of common channel and dedicated channel resources prepared for simulating a base station. Play.

  Exemplary embodiments of a virtual field test apparatus according to the present invention will be described below in detail with reference to the drawings.

  FIG. 1 is a block diagram showing a configuration of a virtual field test apparatus according to an embodiment of the present invention. The virtual field test apparatus shown in FIG. 1 includes a system control unit 10, a base station control unit 11 connected to the system control unit 10, a radio wave propagation path environment generation unit 13, and a wireless mobile terminal (hereinafter referred to as “test terminal”). 14 and a plurality of base station simulation units 12 interposed between the base station control unit 11 and the radio wave propagation path environment generation unit 13.

  The system control unit 10 has functions for performing management of base stations arranged in a virtual field, management of radio wave propagation path environment in the virtual field, movement of the test terminal 14, incoming / outgoing call control, and state management. The multiple base station simulator 12 includes a baseband signal transmitter 12a and a baseband signal receiver 12b, and a limited number of common channels for simulating a plurality of base stations surrounding the test terminal 14 in the virtual field, and It has a function of providing dedicated channel resources (see FIGS. 2 and 3). The base station control unit 11 has a function of simulating a base station that transmits and receives with the test terminal 14 using resources provided by the multiple base station simulation unit 12 under the control of the system control unit 10. The radio wave propagation path environment generation unit 13 generates and loads a radio wave propagation path environment indicated by the system control unit 10 on a radio signal exchanged between the base station controlled by the base station control unit 11 and the test terminal 14. It has a function.

  FIG. 2 is a block diagram illustrating a configuration example of a baseband signal transmission unit in the multiple base station simulation unit illustrated in FIG. FIG. 3 is a block diagram illustrating a configuration example of a baseband signal reception unit in the multiple base station simulation unit illustrated in FIG. In FIGS. 2 and 3, only representative channels are shown to facilitate understanding of the present invention, but the present invention is not limited to this. Needless to say, the present invention also includes the case of using other uplink and downlink channels defined in each system.

  In FIG. 2, the baseband signal transmission unit 12 a includes, for example, four downlink channel baseband processing units 21, 22, 23, and 24. The downlink channel baseband processing unit 21 is a baseband processing unit for a downlink common channel for transmitting broadcast information to the test terminal 14, and includes K broadcast channel transmission resources 21-1 to 21 -K. . The downlink common channel baseband processing unit 22 is a downlink common channel baseband processing unit for the test terminal 14 to search for a cell, and includes L pilot channel transmission resources 22-1 to 22-L. Yes.

  The downlink common channel baseband processing unit 23 is a downlink common channel baseband processing unit for transmitting a connection request to the test terminal 14, and includes M paging channel transmission resources 23-1 to 23-M. I have. The downlink dedicated channel baseband processing unit 24 is a downlink dedicated channel baseband processing unit for performing a call and data communication with the test terminal 14, and includes N dedicated channel transmission resources 24-1 to 24 -N. I have.

  In FIG. 3, the baseband signal receiving unit 12 b is configured by, for example, two uplink channel baseband processing units 31 and 32. The uplink channel baseband processing unit 31 is a baseband processing unit for an uplink common channel for performing a connection request from the test terminal 14, low-rate data communication, and the like, and includes P random access channel reception resources 31-1. ~ 31-P. The uplink channel baseband processing unit 32 is an uplink dedicated channel baseband processing unit for performing communication and data communication with the test terminal 14, and includes Q individual channel reception resources 32-1 to 32-Q. Yes.

  Here, the numbers K, L, M, N, P, and Q of transmission / reception resources of each common channel and individual channel prepared in the baseband signal transmission unit 12a and the baseband signal reception unit 12b are the terminals and base stations in the mobile communication system. Is determined from the maximum number of common channels required for simultaneous measurement, the corresponding carrier frequency, the base station arrangement on the field, and the like. Hereinafter, a description will be given with reference to FIG.

FIG. 4 is a diagram for explaining a method of determining the number of transmission resources shown in FIG. 2 and the number of reception resources shown in FIG. In FIG. 4, the maximum number of supported carrier frequencies (uplinks) used by the test terminal 14 is four, and the maximum number of corresponding carrier frequencies (downlinks) used by the base station is four. The maximum number of individual channels that can be simultaneously communicated is eight, and the number of sectors covering the test terminal 14 is eight. The uplink frequencies are expressed as f _c1 , f _c2 , f _c3 and f _c4 . Further, the downlink frequencies are denoted as F _c1 , F _c2 , F _c3 , and F _c4 .

In this case, the test terminal 14 measures the reception quality of the common channel at the carrier frequency in each sector to be covered, determines the sector and carrier frequency for starting communication, and reports measurement information for performing the handover process. Therefore, it is necessary to receive a common channel at four carrier frequencies in each of up to eight sectors. Therefore, the number K, L, M of transmission resources of the common channel in the baseband signal transmission unit 12a is
K = L = M = (maximum number of sectors covering the test terminal) × (maximum value of the corresponding carrier frequency) + α = 8 × 8 + α = 64 + α (1)
Can be determined.

  In equation (1), the constant α is the number of spare resources for continuously switching between the base station and the sector that simulate the communication as the test terminal 14 moves. This constant α can be obtained as follows. For example, when the maximum number of sectors covering the test terminal 14 is 3, and the sector covering the test terminal 14 changes from sector A, B, C to sector C, D as the test terminal 14 moves, the following Thus, continuous sector switching can be realized by simulating each sector.

  That is, first, simulation of sector D is newly started. The sectors covering the test terminal 14 at this time are A, B, C, and D. Next, the simulation of sectors A and B that no longer cover the test terminal 14 is stopped. As a result, the sectors covering the test terminal 14 are C and D. In this case, since the maximum value of the number of sectors covering the test terminal 14 is 3, and one new sector is newly added, the number of sectors covering the test terminal 14 temporarily exceeds the maximum number. For example, if the number of sectors that can be added at one time is 1, and a plurality of sectors are added, α = 1 can be set by repeating the sector addition process a plurality of times.

  In addition, as shown in FIG. 4, when the maximum value of the individual channels that can be simultaneously communicated between the base station and the test terminal 14 is 8, the base station does not need to transmit / receive 8 or more individual channels. The number of dedicated channel transmission / reception resources N and Q can be determined as N = Q = 8.

  Next, FIG. 5 is a diagram illustrating an example of base station operation parameters provided by the system control unit illustrated in FIG. 1 to the base station control unit. In FIG. 5, “corresponding carrier frequency (uplink)”, “corresponding carrier frequency (downlink)”, “sector configuration”, and “corresponding physical channel” are defined for each of the three base stations BTS1, BTS2, and BTS3.

In the base station BTS1, the corresponding carrier frequencies (upstream) are four ( _fc1 , _fc2 , _fc3 , _fc4 ), and the corresponding carrier frequencies (downlinks) are also four ( _Fc1 , _Fc2,. F _c3 , F _c4 ). The sector structure is assumed to be composed of four sectors divided every 90 °.

In the base station BTS2, the corresponding carrier frequencies (upstream) are four ( _fc1 , _fc2 , _fc3 , _fc4 ), and the corresponding carrier frequencies (downstream) are also four ( _Fc1 , _Fc2,. F _c3 , F _c4 ). The sector configuration is composed of six sectors divided every 60 °.

In the base station BTS3, the corresponding carrier frequencies (uplink) are two ( _fc1 , _fc2 ), and the corresponding carrier frequencies (downlink) are also two ( _Fc1 , _Fc2 ). The sector configuration is composed of six sectors divided every 60 °.

  The corresponding physical channel is common to the three base stations BTS1, BTS2, and BTS3. The downlink broadcast channel, pilot channel, and paging channel used by the base station, and the uplink and downlink used by both the base station and the test terminal are used. Dedicated channels and an uplink random access channel used by the test terminal.

Moreover, FIG. 6 is a figure which shows an example of the carrier frequency with which the test terminal shown in FIG. 1 is equipped. Similarly to the base station BTS, the test terminal 14 can be equipped with a maximum of four carrier frequencies. However, as shown in FIG. 6, for example, the test terminal 14 can be configured to correspond to two carrier frequencies f _c1 and f _c2. .

  The operation of the field test apparatus configured as described above will be described below with reference to FIGS. FIG. 7 is a diagram illustrating a configuration example of a virtual field and a moving route of the test terminal. FIG. 8 is an enlarged view of the moving path portion of the test terminal shown in FIG. 9 and 10 are flowcharts for explaining the test operation at the initial position LOC1 shown in FIG. 11 and 12 are flowcharts for explaining the test operation at the position LOC2 after the movement shown in FIG. 13 and 14 are flowcharts for explaining the test operation at the position LOC3 after the movement shown in FIG.

  As shown in FIG. 7, the virtual field 40 is configured by a large number of base station cover areas having overlapping areas. Among them, the test terminal 14 communicates with each base station (hereinafter referred to as “BTS1, BTS2, BTS3”) in the base station cover areas 41, 42, and 43 indicated by solid lines, and the base station cover area indicated by broken lines. Then, no communication is performed. That is, the test terminal 14 moves with the BTS 2 cover area 42 and the BTS 3 cover area 43 along the movement path 46 starting from the initial position 45 in the BTS 1 cover area 41.

  In FIG. 8, the BTS1 cover area 41 is composed of four sectors as shown in FIG. 5, and two sectors 81 and 82 are shown. As shown in FIG. 5, the BTS2 cover area 42 is composed of six sectors, of which two sectors 83 and 84 are shown. The BTS3 cover area 43 is composed of six sectors as shown in FIG. 5, and two sectors 85 and 86 are shown.

  The system control unit 10 determines the position indicated in the vicinity of the boundary between the sector 81 and the sector 82 in the region where the position LOC1 indicated in the sector 81 overlaps with the sectors 81 and 82 in the BTS1 cover area 41 and the sector 83 in the BTS2 cover area 42. The LOC2 and the position LOC3 shown near the boundary between the sector 83 and the sector 84 in the BTS2 cover area 42 and the sector 85 in the area where the sector 84 in the BTS2 cover area 42 and the sector 85 in the BTS3 cover area 43 overlap. At the position LOC4, the test of the base stations (BTS1, BTS2, BTS3) using the test terminal 14 is performed according to the procedure described below.

  (A) The operation when the test terminal 14 starts communication at the position LOC1 will be described with reference to FIGS. In step ST1, the system control unit 10 first sets the test start position LOC1 in the virtual field 40, and controls the test terminal 14 to enter a standby state. Next, parameters for simulating the radio wave propagation path environment around the test terminal 14 are set in the radio wave propagation path environment generation unit 13 based on the position LOC1 of the test terminal 14 and the base station arrangement information. This parameter is the amplitude information and phase information of the radio signal obtained from the delay profile in the field, data obtained by actually measuring the reception level, or data calculated on the computer by ray tracing or the like. These pieces of information are values obtained based on various information that affects radio wave propagation in fields such as buildings, tunnels, and natural terrain, such as time variations at the stationary point of the test terminal 14 and arbitrary movement routes. It also corresponds to fluctuations when moving at speed.

  Then, the system control unit 10 determines a base station where radio waves can physically reach the test terminal 14 among the base stations surrounding the test terminal 14 based on the radio wave propagation information and the base station arrangement information. A parameter necessary for operating the base station is set in the base station control unit 11. In the example shown in FIG. 7, since the test start position LOC1 of the test terminal 14 is included only in the BTS1 cover area 41, the system control unit 10 sets the operation parameters of the BTS1 to the base station control unit 11. Become. For example, as described with reference to FIG. 5, the operation parameters include a physical channel, a carrier frequency, a sector configuration, and the like corresponding to the BTS 1. When the operation parameters of BTS 1 are set, system control unit 10 instructs base station control unit 11 to transmit a broadcast channel, a paging channel, and a pilot channel and to receive a random access channel in sector 81 of BTS 1. .

  In step ST2, the base station control unit 11 receives the operation parameters of the BTS 1 and the transmission / reception instruction from the system control unit 10, determines transmission / reception resources to be used by the multiple base station simulation unit 12, and baseband signal transmission unit 12a. Is instructed to transmit a downlink common channel (broadcast channel, pilot channel), and simulates transmission / reception by the common channel with the test terminal 14 in the sector 81 of BTS1.

Here, the transmission / reception resources used by the multiple base station simulation unit 12 determined by the base station control unit 11 are as follows. That is, as shown in FIG. 5, in downlink transmission in BTS1, since it corresponds to four carrier frequencies ( _fc1 , _fc2 , _fc3 , _fc4 ), broadcast channel transmission resources in the baseband signal transmission unit 12a It is determined that 21-1 to 21-4 are used, pilot channel transmission resources 22-1 to 22-4 are used, and paging channel transmission resources 23-1 to 23-4 are used. Further, in the uplink reception in BTS1, because it corresponds to the four carrier frequencies _{(F c1, F c2, F} c3, F c4), a random access channel receiver resources in the base-band signal receiving unit 12b 31 - 1 to 31 - 4 Decide to use.

  The above is a decision in the case of simulating transmission / reception of the common channel in the sector 81 at the corresponding four carrier frequencies from the BTS 1 side. For example, as shown in FIG. When only the frequency is supported, the test terminal 14 determines according to the corresponding carrier frequency.

  In step ST3, when transmission of the downlink common channel is started in the baseband signal transmission unit 12a, the baseband signal of each channel is input to the radio wave propagation path environment generation unit 13. The radio wave propagation path environment generation unit 13 performs transmission filtering and up-conversion to a carrier frequency on each baseband signal, then changes amplitude and phase due to multipath interference, noise, fading, etc. in the virtual field, noise components Are transmitted to the test terminal 14.

In step ST4, the test terminal 14 determines a base station, a sector, and a carrier frequency for performing location registration from the content of broadcast information transmitted through the broadcast channel and the quality of the pilot channel, and the determined sector of the base station A location is registered by transmitting a random access channel. In the present example, since the position LOC1 of the test terminal 14 exists in the sector 81 of the BTS1 cover area 41, the test terminal 14 transmits the position registration information to the sector 81 of the BTS1. Note that the test terminal 14 determines the downlink carrier frequency as f _c2 and determines the uplink carrier frequency as F _c2 .

  In step ST5, the radio wave propagation path environment generation unit 13 changes the amplitude and phase due to multipath interference, noise, fading, and the like in the virtual field 40 to the random access channel including the position registration information received from the test terminal 14, and noise components. , Receiving filtering and down-conversion are performed and handed over to the baseband signal receiving unit 12b.

In Step ST6, the baseband signal receiving unit 12b demodulates and decodes the received baseband signal using the random access channel reception processing resources 31-1 to 31-4. In this example, since the random access channel is transmitted from the test terminal 14 using the carrier frequency F _c2 , for example, the location registration information is correctly decoded in the random access channel reception processing resource 31-2, and the base station control unit 11 is used. Is transmitted to the system control unit 10. As a result, the position of the test terminal 14 is registered in the system control unit 10, and an incoming / outgoing call at the test terminal 14 becomes possible.

  In the virtual field test apparatus according to this embodiment, both the transmission from the base station side (multiple base station simulation unit 12) and the transmission from the mobile station side (test terminal 14) are performed as in the normal wireless cellular system. Is possible. Here, a case where transmission is made from the base station side (multiple base station simulation unit 12) will be described.

  That is, the system control unit 10 requests the base station control unit 11 to connect to the test terminal 14 based on the received location registration information of the test terminal 14 (step ST7). In response, the base station control unit 11 determines the base station, sector, and carrier frequency to which the connection request is directed and instructs the baseband signal transmission unit 12a to perform connection request processing (step ST8). Thus, since the paging information is output to the radio wave propagation path environment generation unit 13 using the paging channel transmission processing resource in the baseband transmission unit 12a, the radio wave propagation path environment generation unit 13 described above for the received paging channel. The radio wave propagation path environment is loaded and transmitted to the test terminal 14 (step ST9).

  The test terminal 14 recognizes the connection request from the paging information included in the received paging channel and, when permitting, transmits a random access channel to notify the connection permission (step ST10). The radio wave propagation path environment generation unit 13 loads the above-described radio wave propagation path environment on the received random access channel and delivers it to the baseband signal reception unit 12b (step ST11). In the baseband signal reception unit 12b, the connection permission is decoded using the random access channel reception resource, and is transmitted to the system control unit 10 via the base station control unit 11 (step ST12).

  The system control unit 10 confirms the connection permission and requests the base station control unit 11 to transmit / receive to / from the test terminal 14 (step ST13). In response to the transmission / reception request, the base station control unit 11 determines transmission / reception resources (dedicated channels) to be used by the multiple base station simulation unit 12, and sets an individual channel between the multiple base station simulation unit 12 and the test terminal 14. Establish and simulate transmission / reception (step ST14).

Here, the following transmission / reception simulation using dedicated channels is performed. That is, the dedicated channel transmission resource 24-1 of the baseband signal transmission unit 12a is used to simulate dedicated channel transmission at a downlink carrier frequency permitted to be connected from the sector 81, for example, _fc2 . In addition, the dedicated channel reception resource 32-1 of the baseband signal transmission unit 12b is used to simulate dedicated channel reception at an uplink carrier frequency corresponding to the carrier frequency f _c2 of the downlink dedicated channel in the sector 81, for example, F _c2. .

  As described above, downlink dedicated channel transmission from the baseband signal transmission unit 12a to the test terminal 14 and uplink dedicated channel reception from the test terminal 14 to the baseband signal reception unit 12b are started, and the multiple base station simulation unit 12 generates Communication (call or data transmission / reception) between the base station and the test terminal 14 is realized.

  As described above, the system control unit 10 performs transmission / reception control of the common channel used to determine the sector, the carrier frequency, the communication channel, and the like with which the test terminal 14 makes a call before starting a call with the test end terminal 14. Then, the base station control unit 11 is simulated so that only the combination of the sector and carrier frequency of the base station covering the test terminal 14 is switched, and the base station, sector, and carrier frequency to be simulated are switched as the test terminal 14 moves. It comes to control.

  (B) Next, the operation when the test terminal 14 has moved to the position LOC2 will be described with reference to FIGS. In step ST20, the system control unit 10 first causes the radio wave propagation path environment generation unit 13 to simulate the radio wave propagation path environment around the test terminal 14 based on the position LOC2 of the test terminal 14 and the base station arrangement information. Set. Next, based on the radio wave propagation information and the base station arrangement information, a base station where radio waves can physically reach the test terminal 14 is determined among the base stations surrounding the test terminal 14, and the determined base station is operated. Therefore, parameters necessary for this are set in the base station control unit 11.

  In the present example, when the test terminal 14 reaches the position LOC2 while performing communication, as shown in FIG. 8, the test terminal 14 is performing communication with the BTS1 in the overlapping region of the BTS1 cover area 41 and the BTS2 cover area 42. At this time, since the test terminal 14 is covered by the sectors 81 and 82 in the BTS1 cover area 41 and the sector 83 in the BTS2 cover area 42, the system control unit 10 operates the BTS1 and BTS2 surrounding the test terminal 14. The parameter is set in the base station control unit 11. However, since the operation parameters of BTS1 have already been set at the position LOC1, only the operation parameters of BTS2 are set here. The operational parameters of BTS2 are as shown in FIG. When the system control unit 10 sets the operation parameters of the BTS 2, the broadcast control channel, the paging channel, and the pilot channel are transmitted to the base station control unit 11 in the sector 82 of the BTS 1 and the sector 83 of the BTS 2. Instruct to receive the channel.

  In step ST21, the base station control unit 11 receives the operation parameters and transmission / reception instructions of the BTS 2 from the system control unit 10, determines transmission / reception resources to be used by the multiple base station simulation unit 12, and baseband signal transmission unit 12a. Is instructed to transmit the downlink common channel (broadcast channel, pilot channel), and the transmission / reception by the common channel with the test terminal 14 in the sector 82 of BTS1 and the sector 83 of BTS2 is simulated.

  At this time, transmission / reception is continuously simulated without opening the common channel and the individual channel opened at the position LOC1. That is, broadcast channel transmission resources 21-1 to 21-4, pilot channel transmission resources 22-1 to 22-4, paging channel transmission resources 23-1 to 23-4, and dedicated channel transmission resources 24-1 to 24-24. -4, random access channel reception resources 31-1 to 31-4, and dedicated channel reception resources 32-1 to 32-4 are not released, and transmission / reception of the common channel and the dedicated channel in the sector 81 of BTS1 is continued. To simulate.

  Therefore, the transmission / reception resources used by the multiple base station simulation unit 12 determined by the base station control unit 11 are as follows. The carrier frequencies in BTS2 are the same four as in BTS1, as shown in FIG. In sector 82, broadcast channel transmission resources 21-5 to 21-8 are used, pilot channel transmission resources 22-5 to 22-8 are used, paging channel transmission resources 23-5 to 23-8 are used, and random numbers are used. The access channel reception resources 31-5 to 31-8 are determined to be used. In sector 83, broadcast channel transmission resources 21-9 to 21-12 are used, pilot channel transmission resources 22-9 to 22-12 are used, and paging channel transmission resources 23-9 to 23-12 are used. The random access channel reception resources 31-9 to 31-12 are determined to be used.

  The above is a decision in the case of simulating transmission / reception of the common channel in the sectors 82 and 83 at the corresponding four carrier frequencies from the standpoint of the BTS1 and BTS2, but for example, as shown in FIG. If only corresponds to two carrier frequencies, the test terminal 14 decides according to the corresponding carrier frequencies.

In step ST22, the test terminal 14 measures the reception quality of the pilot channel received at each sector and carrier frequency, and receives reception quality measurement information using an individual channel communicating at the carrier frequency _fc2 in the sector 81. Report to the system control unit 10 periodically.

  In step ST23, the radio wave propagation path environment generation unit 13 loads the radio wave propagation path environment on the downlink common channel received from the baseband signal transmission unit 12a and transmits the load to the test terminal 14. The radio wave propagation path environment is loaded on the random access channel received from the test terminal 14 and delivered to the baseband signal receiving unit 12b. In addition, the radio wave propagation path environment is loaded on an individual channel periodically received from the test terminal 14 and delivered to the baseband signal reception unit 12b.

  In step ST24, the baseband signal reception unit 12b demodulates and decodes the received baseband signal using the dedicated channel reception processing resource. The decoded reception quality measurement information is transmitted to the system control unit 10 via the base station control unit 11.

  In step ST25, the system control unit 10 determines a sector and a carrier frequency to which the test terminal 14 performs handover from reception quality of pilot channels at four carrier frequencies in each of the sectors 81, 82, and 83. And the new sector which communicates with the test terminal 14 is notified with respect to the base station control part 11. FIG.

In the present example, when the test terminal 14 exceeds the reception there is quality threshold of the pilot channel of a sector 81, 82 and 83 at the carrier frequency f _c2 measured at position LOC2, test terminals 14 a handover The sector 82 and sector 83 to be performed and the carrier frequency f _c2 are determined, and the base station control unit 11 is instructed to communicate with the test terminal 14 also in the sector 82 and sector 83 at the carrier frequency f _c2 .

In step ST26, the base station control unit 11 determines the added transmission / reception resource (dedicated channel) for the sector to be used in the multiple base station simulation unit 12, and between the multiple base station simulation unit 12 and the test terminal 14. Establish an individual channel and simulate transmission / reception of the individual channel. For example, by using the individual channel transmission resources 24-2 and 24-3 in the baseband signal transmitting section 12a, to simulate the dedicated channel transmission in a sector 82 and sector 83 at the carrier frequency f _c2. In addition, dedicated channel reception resources 32-2 and 32-3 in the baseband signal receiving unit 12b are used to simulate dedicated channel reception in the sector 82 and the sector 83 at the carrier frequency F _c2 . The dedicated channel transmission resource 24-1 and the dedicated channel reception resource 32-1 are not released, and the transmission / reception of the dedicated channel in the sector 81 is continuously simulated.

In step ST27, the system control unit 10 instructs the test terminal 14 to communicate with the added sector using the dedicated channel that is used without being released. That is, the system control unit 10 uses the individual channel in the sector 81 of the carrier frequency _fc2 currently used for communication so that the test terminal 14 communicates with the sectors 82 and 83 in addition to the sector 81. Instruct. Note that a sector that performs communication is hereinafter referred to as an “active set”.

In step ST28, the test terminal 14 starts transmission / reception on the individual channel in the sector at the position LOC1 and the sector specified to be added at the position LOC2, and immediately after the transmission / reception starts, the system uses the individual channel for which connection has been established. The control unit 10 is notified of the completion of addition of the designated sector. That is, after receiving the instruction, the test terminal 14 starts transmission / reception of the dedicated channel at the carrier frequencies f _c2 (reception) and F _c2 (transmission) in the sectors 81, 82, and 83. Immediately after the start of the transmission / reception, the test terminal 14 notifies the system control unit 10 of addition of the sectors 82 and 83 to the active set using the dedicated channel with which the connection has been established, and the handover process in the test terminal 14 is completed.

As described above, when the test terminal 14 exceeds the reception there is quality threshold of the pilot channel of a sector 81, 82 and 83 at the carrier frequency f _c2 measured at position LOC2, test terminals 14 communicating In addition to the sector 81, the sector 82 and the sector 83 are added as sectors for communication, and transmission and reception of individual channels are simultaneously performed in the sectors 81, 82, and 83 at the carrier frequencies f _c2 (downstream) and F _c2 (upstream). And communication in the handover state is realized.

  (C) Next, the operation when the test terminal 14 has moved to the position LOC3 will be described with reference to FIGS. In step ST30, when the test terminal 14 reaches the position LOC3 while communicating with BTS1 and BTS2, the system control unit 10 instructs the radio wave propagation path environment generation unit 13 based on the position LOC3 and the base station arrangement information. Set parameters for simulating surrounding radio wave propagation paths. However, since the position LOC3 is near the boundary between the sector 83 and the sector 84 in the BTS2 cover area 42, and the base station operation parameter of the BTS2 has already been set at the position LOC2, here, the position LOC3 for the base station control unit 11 Base station operation parameters are not set. The system control unit 10 instructs the base station control unit 11 to transmit a broadcast channel, a paging channel, and a pilot channel and to receive a random access channel from the new sector 84 at the position LOC3.

  In step ST31, the base station control unit 11 receives a transmission / reception instruction from the system control unit 10, determines transmission / reception resources to be used by the multiple base station simulation unit 12, and transmits a downlink common channel (broadcast) to the baseband signal transmission unit 12a. (Channel, pilot channel) transmission is instructed, and transmission / reception on the common channel with the test terminal 14 in the sector 84 of the BTS 2 is simulated.

  At this time, transmission / reception is continuously simulated without releasing the common channel and the individual channel established at the positions LOC1 and LOC2. That is, broadcast channel transmission resources 21-1 to 21-12, pilot channel transmission resources 22-1 to 22-12, paging channel transmission resources 23-1 to 23-12, and dedicated channel transmission resources 24-1 to 24-24. -12, random access channel reception resources 31-1 to 31-12 and dedicated channel reception resources 32-1 to 32-12 are not released, and common channels in sectors 81 and 82 of BTS1 and sector 83 of BTS2 The transmission / reception of individual channels is continuously simulated.

  Therefore, the transmission / reception resources used by the multiple base station simulation unit 12 determined by the base station control unit 11 are as follows. The carrier frequencies in BTS2 are the same four as in BTS1, as shown in FIG. In sector 84, broadcast channel transmission resources 21-13 to 21-19 are used, pilot channel transmission resources 22-13 to 22-19 are used, paging channel transmission resources 23-13 to 23-18 are used, and random numbers are used. The access channel reception resources 31-13 to 31-19 are determined to be used.

  The above is a decision in the case of simulating transmission / reception of the common channel in the sector 84 at the corresponding four carrier frequencies from the BTS 3 side. For example, as shown in FIG. 6, the test terminal 14 has two carriers. When only the frequency is supported, the test terminal 14 determines according to the corresponding carrier frequency.

In step ST32, the test terminal 14 measures the reception quality of the pilot channel received at the four carrier frequencies in each of the sectors 81, 82, 83, and ₈₄ , and performs communication at the carrier frequency _fc2 in the sector 81. The reception quality measurement information is periodically reported to the system control unit 10 using the dedicated channel.

  In step ST <b> 33, the radio wave propagation path environment generation unit 13 loads the radio wave propagation path environment on the downlink common channel received from the baseband signal transmission unit 12 a and transmits it to the test terminal 14. The radio wave propagation path environment is loaded on the random access channel received from the test terminal 14 and delivered to the baseband signal receiving unit 12b. In addition, the radio wave propagation path environment is loaded on an individual channel that is periodically received from the test terminal 14 and delivered to the baseband signal receiving unit 12b.

  In step ST34, the baseband signal receiving unit 12b demodulates and decodes the received baseband signal using the dedicated channel reception processing resource. The decoded reception quality measurement information is transmitted to the system control unit 10 via the base station control unit 11.

  In step ST35, the system control unit 10 determines a sector and a carrier frequency to which the test terminal 14 performs handover from reception quality of pilot channels at four carrier frequencies in each of the sectors 81, 82, 83, and 84. And the new sector which communicates with the test terminal 14 is notified with respect to the base station control part 11. FIG.

If in the present example, which exceeds the reception there is quality threshold of the pilot channel of a sector 81, 82, 83, 84 of the carrier frequency f _c2 which is tested terminal 14 was measured at the location LOC3, test terminal 14 is a hand The sector 84 to be over and the carrier frequency _fc2 are determined, and the base station control unit 11 is instructed to communicate with the test terminal 14 also in the sector 84 at the carrier frequency _fc2 .

In step ST36, the base station control unit 11 determines the added transmission / reception resource (dedicated channel) for the sector to be used by the multiple base station simulation unit 12, and between the multiple base station simulation unit 12 and the test terminal 14. Establish an individual channel and simulate transmission / reception of the individual channel. For example, the dedicated channel transmission resource 24-4 in the baseband signal transmission unit 12a is used to simulate dedicated channel transmission in the sector 84 at the carrier frequency _fc2 . Further, the dedicated channel reception resource 32-4 in the baseband signal receiving unit 12b is used to simulate the dedicated channel reception in the sector 84 at the carrier frequency F _c2 . The dedicated channel transmission resources 24-1 to 24-3 and the dedicated channel reception resources 32-1 to 34-3 are not released, and transmission and reception of dedicated channels in the sectors 81, 82, and 83 are continuously simulated. Yes.

In step ST37, the system control unit 10 uses the dedicated channel used without opening the sector at the position LOC1 and the sector at the position LOC2 to the test terminal 14 to determine the sector at the position LOC1. An instruction is given to delete the sector at position LOC2 and to communicate with the sector at position LOC3. That is, the system control unit 10 uses the individual channels in the sectors 81, 82, and 83 of the carrier frequency _fc2 currently used for communication, and excludes the sectors 81 and 82 from the active set for the test terminal 14. , To add the sector 84 to the active set.

  In step ST38, in response to the instruction for addition / deletion, the test terminal 14 stops the transmission / reception of the individual channel in the sector 81 at the position LOC1 and the sector 82 at the position LOC2, and the individual channel in the sector 84 at the position LOC3. Start sending and receiving. Immediately after the start of the transmission / reception, the test terminal 14 notifies the system control unit 10 of the deletion of the sectors 81 and 82 from the active set and the addition of the sector 84 to the active set using the dedicated channel with which the connection has been established. The handover process at the test terminal 14 is completed.

  In step ST39, when receiving a deletion notification from the active set of the sectors 81 and 82 from the test terminal 14, the system control unit 10 transmits / receives the individual channels established at the positions LOC1 and LOC2 to the base station control unit 11. Give instructions to stop. That is, it instructs to stop transmission / reception of individual channels in the sectors 81 and 82.

In step ST40, the base station control unit 11 releases the corresponding dedicated channel transmission resource in the baseband signal transmission unit 12a, and stops the simulation of dedicated channel transmission established at the positions LOC1 and LOC2. Also, the corresponding dedicated channel reception resource in the baseband signal receiving unit 12b is released, and the simulation of dedicated channel reception established at the positions LOC1 and LOC2 is stopped. That is, the dedicated channel transmission resources 24-1 to 24-2 of the baseband signal transmission unit 12a are released, and the simulation of dedicated channel transmission in the sectors 81 and 82 is stopped at the carrier frequency _fc2 . Also, the dedicated channel reception resources 32-1 to 32-2 of the baseband receiving unit 12b are released, and the simulation of dedicated channel reception in the sectors 81 and 82 is stopped at the carrier frequency F _c2 .

  As described above, at the position LOC3, the sector 81 and the sector 82 are out of the coverage area and newly entered into the sector 84 coverage area. Therefore, for the test terminal 14, the sectors 81 and 82 are excluded from the active set. The operation of adding the sector 84 to the active set is performed.

  By the way, even in the sector to which the transmission / reception resources of the common channel and the dedicated channel are allocated, the sector that cannot communicate with the test terminal 14 should stop the transmission / reception of the dedicated channel by appropriately performing the handover process. In preparation for the case where the handover process is not performed correctly, it is necessary to perform the transmission / reception stop process for the dedicated channel together with the common channel.

  That is, in step ST41, the system control unit 10 determines a sector in which radio waves cannot physically reach the current position of the test terminal 14, and notifies the base station control unit 11 of the common channel and the dedicated channel in the corresponding sector. Instructs to stop sending / receiving simulation. As shown in FIG. 8, at the position LOC3, the test terminal 14 is out of the coverage area of the sector 81 and the sector 82, so that neither the common channel nor the dedicated channel in the sectors 81 and 82 can reach the test terminal 14. Therefore, the system control unit 10 instructs the base station control unit 11 to stop the simulation of transmission / reception of the common channel and the dedicated channel in the sector 81 and the sector 82.

  In step ST42, the base station control unit 11 receives a simulation stop instruction from the system control unit 10, releases the corresponding resources of the baseband signal transmission unit 12a and the baseband signal reception unit 12b, and is shared by the designated sector. Stop transmission / reception simulation of channels and individual channels.

  In this example, broadcast channel transmission resources 21-1 to 21-8, pilot channel transmission resources 22-1 to 22-8, and paging channel transmission resources 23-1 to 23-8 of the baseband signal transmission unit 12a Are released, and transmission simulation at four carrier frequencies in the sectors 81 and 82 is stopped. Also, the random access channel reception resources 31-1 to 31-8 of the baseband signal reception unit 12b are released, and the reception simulation at the four carrier frequencies in the sectors 81 and 82 is stopped.

  However, in this example, for the stop instructions sectors 81 and 82, the handover process is correctly performed as described above, and the dedicated channel transmission resources 24-1 to 24-2 of the baseband signal transmission unit 12a have already been released. In addition, since the dedicated channel transmission resources 32-1 to 32-2 of the baseband signal receiving unit 12b have already been released, nothing is performed on the dedicated channel resources in this step ST42.

Thus, transmission / reception of the common channel and the dedicated channel in the sector 81 and the sector 82 is stopped, transmission / reception of the common channel is performed in the sector 83 and the sector 84, and in the sector 83 and the sector 84, the carrier frequency _fc2 (down), F _{In c2} (uplink), transmission / reception of the dedicated channel is performed simultaneously, and communication in the handover state is realized.

  (D) Next, the operation when the test terminal 14 has moved to the position LOC4 will be described with reference to FIG. At the position LOC4, the system control unit 10 deletes the sector 83 from the active set and adds the sector 85 to the active set, so that only the sector 85 is included in the active set. This is similar to the process performed at the position LOC3 for deleting the sector 81 and the sector 82 from the active set and adding the sector 84 to the active set. Therefore, the test terminal 14 communicates with the sector 84 and the sector 85.

  Further, since the sector 83 does not cover the test terminal 14 in the LOC4, the system control unit 10 releases the transmission / reception resources of the common channel and the dedicated channel of the sector 81 and the sector 82 at the position LOC3, and the sector 81 and the sector The simulation of transmission / reception of the common channel and the dedicated channel in the sector 83 is stopped by performing the same processing as the simulation of transmission / reception of the common channel and the dedicated channel in the sector 82 is stopped.

  In addition, the system control unit 10 similarly sets the operation parameters of the BTS 3 that newly covers the test terminal 14 at the position LOC4 in the base station control unit 11 as well. The operational parameters of BTS 3 are shown in FIG. Note that the operation parameters of the BTS 2 have been set at the position LOC2, and are shown in FIG. Eventually, the base station control unit 11 uses the baseband signal transmission / reception resources in the multiple base station simulation unit 12 as follows to simulate communication with the test terminal 14 at the position LOC4.

  That is, (1a) broadcast channel transmission resources 21-13 to 21-16 in the baseband signal transmission unit 12a are used to simulate broadcast channel transmission at four carrier frequencies in the sector 84. (1b) Also, broadcast channel transmission resources 21-1 to 21-2 are used to simulate broadcast channel transmission at two carrier frequencies in the sector 85. (2a) The pilot channel transmission resources 22-13 to 22-16 in the baseband signal transmission unit 12a are used to simulate pilot channel transmission at four carrier frequencies in the sector 84. (2b) Also, pilot channel transmission resources 22-1 to 22-2 are used to simulate pilot channel transmission at two carrier frequencies in the sector 85.

(3a) The paging channel transmission resources 23-13 to 23-16 in the baseband signal transmission unit 12a are used to simulate paging channel transmission at four carrier frequencies in the sector 84. (3b) Further, the paging channel transmission resources 23-1 to 23-2 are used to simulate paging channel transmission at two carrier frequencies in the sector 85. (4a) Random access channel reception resources 31-13 to 31-16 in the baseband signal receiving unit 12b are used to simulate random access channel reception at four carrier frequencies in the sector 84. (4b) Also, random access channel reception resources 31-1 to 31-21 are used to simulate random access channel reception at two carrier frequencies in sector 85. (5a) The dedicated channel transmission resource 24-1 in the baseband signal transmission unit 12a is used to simulate dedicated channel transmission at the carrier frequency _fc2 in the sector 85. (5b) Also, the dedicated channel reception resource 32-1 in the baseband signal receiving unit 12b is used to simulate dedicated channel reception at the carrier frequency F _c2 in the sector 85.

  In the simulation of the sector 84, since BTS2 corresponds to four carrier frequencies, it is assumed that transmission / reception of the common channel in the sector 84 is simulated at four carrier frequencies. However, as shown in FIG. May correspond to only two carrier frequencies, the test terminal 14 may be configured to simulate transmission / reception of a common channel in the sector 84 only at the corresponding carrier frequency. In this case, the sector 85 is the same.

In this state, the test terminal 14 measures the reception quality of the pilot channels in the sectors 84 and 85 at the two carrier frequencies, and reports to the system control unit 10 using the dedicated channel in the sector 85. As shown in FIG. 5, BTS2 corresponds to four carrier frequencies, whereas BTS3 corresponds to only two carrier frequencies, so here, for load balancing, the test terminal 14 is located at position LOC4. The operation in the case of performing inter-frequency handover from the carrier frequency f _c2 (downlink), F _c2 (uplink) to f _c1 (downlink), F _c1 (uplink) will be described.

First, the system control unit 10 instructs the base station control unit 11 to perform transmission / reception of an individual channel at the carrier frequency f _c1 (transmission) and F _c1 (reception) in the sector 85. The base station control unit 11 uses the baseband signal transmission / reception resources in the multiple base station simulation unit 12 as follows to simulate transmission / reception of an individual channel at a different carrier frequency in the sector 85. That is, the dedicated channel transmission resource 24-2 in the baseband signal transmission unit 12a is used to simulate dedicated channel transmission at the carrier frequency f _c1 in the sector 85. Further, the dedicated channel reception resource 32-2 in the baseband signal receiving unit 12b is used to simulate dedicated channel reception at the carrier frequency F _c1 in the sector 85.

Next, regarding the individual channel transmission / reception of the sector 85 at the test terminal 14, the system control unit 10 stops transmission / reception at the carrier frequencies f _c1 (reception) and F _c1 (transmission), and the carrier frequencies f _c2 (reception), F _The test terminal 14 is instructed to use the dedicated channel in the sector 85 at the carrier frequency _fc2 to start transmission / reception at _c2 (transmission). When completing the change of the carrier frequency, the test terminal 14 notifies the system control unit 10 of the completion of the change of the carrier frequency at the carrier frequency F _c1 using the dedicated channel of the sector 85.

Next, the system control unit 10 instructs the base station control unit 11 to stop transmission / reception of dedicated channels at the carrier frequencies f _c2 (transmission) and F _c2 (reception) in the sector 85. The base station control unit 11 releases baseband signal transmission / reception resources in the multiple base station simulation unit 12 as follows, and performs _dedicated channel transmission / reception at the carrier frequencies f _c2 (transmission) and F _c2 (reception) in the sector 85. Stop. That is, the dedicated channel transmission resource 24-1 in the baseband signal transmission unit 12a is released, and the simulation of dedicated channel transmission at the carrier frequency _fc2 in the sector 85 is stopped. Also, the dedicated channel reception resource 32-1 in the baseband signal receiving unit 12b is released, and the simulation of dedicated channel reception at the carrier frequency F _c2 in the sector 85 is stopped.

As a result, the inter-frequency handover from the carrier frequency f _c2 (down) and F _c2 (up) to f _c1 (down) and F _c1 (up) at the position LOC4 of the test terminal 14 is realized.

  As described above, the sector and carrier frequency with which one test terminal communicates at a time are limited, and the base station that communicates with the test terminal can transmit and receive the same sector and carrier frequency that the test terminal can simultaneously communicate with. It is only necessary to simulate the function, and communication between an infinite number of base stations and test terminals in a virtual field can be simulated by switching sectors and carrier frequencies to be simulated by a plurality of base station simulation units according to the position of the test terminal.

  As described above, the system control unit 10 simulates only the sector and the carrier frequency of the base station with which the test terminal 14 communicates at the same time in the transmission / reception control of the individual channel used for the communication between the test terminal 14 and the base station. Then, the base station controller 11 is controlled so as to switch the base station, sector, and carrier frequency to be simulated in accordance with the handover process accompanying the movement of the test terminal 14.

  In this embodiment, in the handover process at the position LOC3 or the position LOC3, since there are enough vacant transmission / reception resources for the common channel and the dedicated channel in the multiple base station simulation unit, all the sectors to be added are added. Unnecessary sectors have been deleted, but if there are no vacant transmission / reception resources for the common channel and dedicated channel, the transmission / reception simulation in unnecessary sectors is stopped simultaneously with the addition of sectors, and You may make it ensure the transmission / reception resource of a common channel and a separate channel in order to perform transmission / reception simulation.

  In this embodiment, for the purpose of fully automating the field test, the system control unit performs the movement of the test terminal, the incoming / outgoing call control, and the state management, but without automatically controlling the test terminal, for example, The field test may be performed by the tester performing a normal operation on the test terminal to perform a call or data communication.

  As described above, the virtual field test apparatus according to the present invention is useful for performing field tests of wireless mobile terminals in virtual fields including a myriad of base stations using a limited number of common channel and dedicated channel resources. In particular, it is suitable for simulating the operation of a base station that communicates with a wireless mobile terminal.

It is a block diagram which shows the structure of the virtual field test apparatus which is one embodiment of this invention. It is a block diagram which shows the structural example of the baseband signal transmission part in the multiple base station simulation part shown in FIG. FIG. 2 is a block diagram illustrating a configuration example of a baseband signal reception unit in the multiple base station simulation unit illustrated in FIG. 1. FIG. 4 is a diagram illustrating a method for determining the number of transmission resources illustrated in FIG. 2 and the number of reception resources illustrated in FIG. 3. It is a figure which shows an example of the base station operation parameter which the system control part shown in FIG. 1 gives to a base station control part. It is a figure which shows an example of the carrier frequency with which the test terminal shown in FIG. 1 is equipped. It is a figure explaining the structural example of a virtual field, and the movement path | route of a test terminal. It is a figure which expands and shows the movement path | route part of the test terminal shown in FIG. 9 is a flowchart for explaining a test operation at an initial position LOC1 shown in FIG. 8 (No. 1). FIG. 9 is a flowchart for explaining a test operation at the initial position LOC1 shown in FIG. 8 (No. 2). FIG. 9 is a flowchart for explaining a test operation at a position LOC2 after movement shown in FIG. 8 (part 1); 9 is a flowchart for explaining a test operation at a position LOC2 after movement shown in FIG. 8 (part 2). FIG. 9 is a flowchart for explaining a test operation at a position LOC3 after movement shown in FIG. 8 (part 1); FIG. 9 is a flowchart for explaining a test operation at a position LOC3 after movement shown in FIG. 8 (part 2);

Explanation of symbols

10 system controller,
11 Base station controller,
12 multiple base station simulation section,
12a baseband signal transmitter,
12b baseband signal receiver,
13 Radio wave propagation path environment generation unit,
14 wireless mobile terminals (test terminals),
21, 22, 23, 24 Downstream channel baseband processing unit,
21-1 to 21-K broadcast channel transmission resources,
22-1 to 22-L pilot channel transmission resources,
23-1 to 23-M paging channel transmission resources,
24-1 to 24-N dedicated channel transmission resources,
31, 32 Up channel baseband processing unit,
31-1 to 31-P Random access channel reception resource,
32-1 to 32-Q dedicated channel reception resources,
40 virtual fields,
41 Base station 1 (BTS1) cover area,
42 Base station 2 (BTS2) cover area,
43 Base station 3 (BTS3) cover area,
45 Initial position of test terminal,
46 Test terminal travel path,
81-85 Sectors present on the test terminal movement path,
LOC1 to LOC4 Test location of the test terminal.

Claims (5)

A system control unit for managing at least a base station arranged in the virtual field and a radio propagation path environment in the virtual field;
A plurality of base station simulating units for providing resources of common channels and dedicated channels that simulate a plurality of base stations surrounding the wireless mobile terminal in the virtual field;
A base station control unit that controls a base station that transmits and receives to and from the wireless mobile terminal using resources provided by the plurality of base station simulation units under the control of the system control unit;
A radio wave propagation path environment generation unit configured to generate and load a radio wave propagation path environment instructed by the system control unit to a radio signal exchanged between the base station controlled by the base station control unit and the radio mobile terminal;
A virtual field test apparatus comprising: The system controller is
Means for performing wireless mobile terminal movement, incoming and outgoing call control and status management;
The virtual field test apparatus according to claim 1, further comprising: The system controller is
In transmission / reception of a common channel, the base station control is performed such that the base station, sector, and carrier frequency to be simulated are switched as the radio mobile terminal moves, by simulating the base station sector and carrier frequency covering the radio mobile terminal. Means for controlling the part,
The virtual field test apparatus according to claim 1, further comprising: The system controller is
In the transmission / reception of dedicated channels, only the sector and carrier frequency of the base station with which the wireless mobile terminal communicates at the same time are simulated, and the base station, sector and carrier frequency simulated according to the handover process accompanying the movement of the wireless mobile terminal are Means for controlling the base station controller to switch;
The virtual field test apparatus according to claim 1, further comprising: The base station controller
When there are no available resources provided by the plurality of base station simulation units, a common channel and an individual channel for performing transmission / reception simulation in a newly added sector are stopped at the same time as adding sectors Means for securing the plurality of resources in the base station simulation unit,
The virtual field test apparatus according to claim 3, further comprising:

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