JP6502883B2 - Base station apparatus, communication control method, and computer program - Google Patents

Description

  The present invention relates to a base station apparatus, a communication control method, and a computer program.

  Conventionally, in a wireless communication system, a wireless relay technology is known in which a wireless repeater device is provided corresponding to a base station device, and wireless signals are relayed between the base station device and a terminal device by the wireless repeater device. According to this radio relay technology, the coverage (communicable range) of the base station apparatus can be expanded.

  Further, in Patent Document 1, a registration table in which information related to a terminal permitted to be used for a specific base station is registered is prepared in advance, and the terminal registered in the registration table is used as the specific base station. There is disclosed a state control system of a terminal which makes communication possible and makes a terminal not registered in the registration table incapable of communication using the specific base station.

Patent No. 4318520

3GPP TS 36.101 User Equipment (UE) radio transmission and reception 3GPP TS 36.321 Medium Access Control (MAC) protocol specification 3GPP TS 36.331 Radio Resource Control (RRC); Protocol specification

  In recent years, in order to use frequency resources, there may be cases where use is permitted for use in a wireless communication system, with respect to a frequency band that has not been previously permitted for use in a certain wireless communication system. In this case, by the base station apparatus, the terminal apparatus and the wireless repeater apparatus corresponding to the new frequency band, the above-described wireless relay technology can be used for the new frequency band. However, because replacing the existing wireless repeater device with a wireless repeater device compatible with the new frequency band is costly and time-consuming, the wireless repeater device not compatible with the new frequency band is used. There is a possibility that you Here, in a wireless communication system in which a wireless repeater device that does not correspond to a new frequency band exists, it is conceivable that all terminal devices be treated uniformly so as not to use the new frequency band. It is not possible to take advantage of the new frequency band at the time of coping.

  Further, according to the prior art of Patent Document 1 described above, in a specific base station apparatus using a new frequency band, the registration table of the terminal apparatus corresponding to the new frequency band is prepared in advance. A terminal device registered in the registration table can be made communicable using the specific base station, and a terminal device not registered in the registration table can not be made communicable using the specific base station. it can. However, in a wireless communication system in which a wireless repeater device not compatible with a new frequency band exists, even if a terminal device registered in the registration table can be communicated using the particular base station, The terminal device could not communicate with the specific base station via the wireless repeater device.

  The present invention has been made in consideration of the above circumstances, and a base station apparatus capable of appropriately applying the restriction of the use frequency of a wireless repeater apparatus to a terminal apparatus performing wireless communication with a base station apparatus. It is an object of the present invention to provide a communication control method and a computer program.

(1) One aspect of the present invention is a base station apparatus that performs radio communication with a terminal apparatus, and a delay amount information acquisition unit that acquires delay amount information representing an amount of delay of radio communication between the terminal apparatus and the base station apparatus And, based on the delay amount information acquired by the delay amount information acquiring unit, corresponding to the base station device as a restriction of a use frequency band applied to wireless communication between the terminal device and the base station device. A base station apparatus comprising: a radio control unit that determines whether to apply a restriction on a use frequency band of the provided radio repeater apparatus; an available frequency band that can be used by the radio repeater apparatus is It is one band, and the usable frequency band that can be used by the base station apparatus is another band different from the first band and the first band, and the radio control unit indicates that the delay amount information indicates delay The restriction of the use frequency band of the wireless repeater device is applied when the value is equal to or more than the threshold, and the terminal device uses the other band when the delay amount represented by the delay amount information is less than the threshold. The restriction of the use frequency band of the wireless repeater device is not applied when it is possible, while the restriction of the use frequency band of the wireless repeater device is applied when the terminal device can not use the other band, It is a base station apparatus.
( 2 ) In one aspect of the present invention, in the base station apparatus according to the above (1) , the delay amount information acquiring unit transmits the random access channel signal received by the base station apparatus from the terminal apparatus. The base station apparatus acquires the delay amount information based on the transmission timing correction value of the uplink radio frame for the downlink radio frame transmitted to the terminal apparatus.

( 3 ) One aspect of the present invention is a communication control method of a base station apparatus performing wireless communication with a terminal apparatus, wherein the base station apparatus represents a delay amount indicating delay of wireless communication between the terminal apparatus and the base station apparatus. Applying to wireless communication between the terminal apparatus and the base station apparatus based on the delay amount information acquired by the base station apparatus in the delay amount information acquiring step of acquiring amount information; A wireless control step of determining whether to apply the restriction of the use frequency band of the wireless repeater apparatus provided corresponding to the base station apparatus as the restriction of the use frequency band to be selected ; The usable frequency band that can be used by the wireless repeater device is the first band, and the usable frequency bands that can be used by the base station device are the first band and the first band. And the base station apparatus applies the restriction of the use frequency band of the wireless repeater apparatus when the delay amount represented by the delay amount information is equal to or greater than a threshold, and the delay amount information When the terminal device can use the other band when the delay amount to be expressed is less than the threshold, the restriction of the use frequency band of the wireless repeater device is not applied, while the terminal device is not the other terminal. The communication control method applies the restriction of the use frequency band of the wireless repeater when the band can not be used .

( 4 ) One aspect of the present invention is delay amount information for acquiring delay amount information indicating delay amount of wireless communication between the terminal device and the base station device in a computer of a base station device performing wireless communication with the terminal device The base station apparatus is supported as a restriction of a use frequency band applied to wireless communication between the terminal apparatus and the base station apparatus based on the acquisition function and the delay amount information acquired by the delay amount information acquisition function. A computer program for realizing a wireless control function of determining whether or not the restriction of the use frequency band of the wireless repeater device provided is applied, which can be used by the wireless repeater device The frequency band is a first band, and the usable frequency band that can be used by the base station apparatus is the first band and another band different from the first band, The line control function applies the restriction of the use frequency band of the wireless repeater device when the delay amount represented by the delay amount information is equal to or greater than a threshold, and the delay amount represented by the delay amount information is less than the threshold. The restriction of the use frequency band of the wireless repeater device is not applied when the terminal device can use the other band, while the terminal device can not use the other band. It is a computer program which applies restrictions of the use frequency band of a radio repeater device .

  According to the present invention, it is possible to appropriately apply the restriction of the use frequency of the wireless repeater device to a terminal device that performs wireless communication with a base station device.

It is a figure which shows the structural example of the radio | wireless communications system which concerns on one Embodiment. It is a figure which shows the function structural example of the base station apparatus eNB which concerns on one Embodiment. It is a figure which shows the hardware structural example of the base station apparatus eNB which concerns on one Embodiment. It is a figure which shows the example of the restrictions of the use frequency band of the radio repeater apparatus Rep which concerns on one Embodiment. It is a figure which shows the example of the restrictions of the other use frequency band which concerns on one Embodiment. It is a flowchart which shows the example of the communication control method which concerns on one Embodiment. It is a general | schematic sequence chart which concerns on the RACH signal which concerns on one Embodiment. It is explanatory drawing of "TA command" which concerns on one Embodiment. It is explanatory drawing of the delay amount threshold-value determination method which concerns on one Embodiment.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
FIG. 1 is a view showing an example of the configuration of a wireless communication system according to the present embodiment. The wireless communication system illustrated in FIG. 1 includes a base station apparatus eNB, terminal apparatuses UE_1 and UE_2, and a wireless repeater apparatus Rep. The wireless repeater apparatus Rep is provided to correspond to the base station apparatus eNB. The radio repeater apparatus Rep relays a radio signal exchanged between the base station apparatus eNB and the terminal apparatus. The radio signal exchanged between the base station apparatus eNB and the terminal apparatus includes a signal (UL signal) of a link (uplink (UL): UL) in the direction from the terminal apparatus to the base station apparatus eNB, and a base station There is a link in the direction from the device eNB to the terminal device (downlink (DL) signal (DL signal)).

  The terminal device UE_1 relatively exists near the base station device eNB. The terminal device UE_2 is relatively far from the base station apparatus eNB. The terminal device UE_1 can transmit and receive radio signals to and from the base station apparatus eNB without passing through the radio repeater apparatus Rep. The terminal device UE_2 can not transmit and receive radio signals to and from the base station device eNB without passing through the radio repeater device Rep. However, the terminal apparatus UE_2 can transmit and receive radio signals to and from the base station apparatus eNB via the radio repeater apparatus Rep. In this manner, the coverage Cov of the base station apparatus eNB can be expanded by the wireless repeater apparatus Rep.

  Hereinafter, the terminal devices UE_1 and UE_2 are referred to as a terminal device UE when not particularly distinguished.

  FIG. 2 is a diagram showing an example of a functional configuration of the base station apparatus eNB according to the present embodiment. Among the functional configurations of the base station apparatus eNB, FIG. 2 illustrates configurations relating to a delay amount information acquisition function and a radio control function. In FIG. 2, the base station apparatus eNB includes a delay amount information acquisition unit 11 and a radio control unit 12. The delay amount information acquisition unit 11 acquires delay amount information indicating the delay amount of wireless communication between the terminal device UE and the base station device eNB. Based on the delay amount information acquired by the delay amount information acquiring unit 11, the radio control unit 12 uses the radio repeater apparatus Rep as a restriction on the use frequency band applied to radio communication between the terminal apparatus UE and the base station apparatus eNB. It is determined whether or not the restriction of the use frequency band is applied.

  FIG. 3 is a diagram illustrating an example of a hardware configuration of the base station apparatus eNB according to the present embodiment. In FIG. 3, the base station apparatus eNB includes a wireless communication unit 21, a CPU 22, and a storage unit 23. These units are configured to exchange data. The wireless communication unit 21 wirelessly communicates with the terminal device UE. The CPU 22 controls the base station apparatus eNB. This control function is realized by the CPU 22 executing a computer program. The storage unit 23 stores computer programs executed by the CPU 22 and various data. The storage unit 23 stores a wireless control program 31. The functions of the units of the base station apparatus eNB illustrated in FIG. 2 are realized by the CPU 22 illustrated in FIG. 3 executing the wireless control program 31 stored in the storage unit 23.

  The storage unit 23 stores frequency band constraint information 32. The frequency band restriction information 32 includes information indicating the restriction of the use frequency band of the radio repeater apparatus Rep and information indicating the restriction of at least one other use frequency band. Another limitation of the use frequency band is a limitation of the use frequency band applied to the terminal apparatus UE when the restriction of the use frequency band of the wireless repeater apparatus Rep is not applied to the terminal apparatus UE.

  FIG. 4 is a diagram showing an example of the restriction of the use frequency band of the wireless repeater device Rep according to the present embodiment. FIG. 4 shows the restriction of the use frequency band of UL. In the restriction of the use frequency band of the wireless repeater apparatus Rep shown in FIG. 4, the wireless repeater apparatus Rep can use the band B but can not use the band A and the band C.

  FIG. 5 is a diagram showing an example of the restriction of another use frequency band according to the present embodiment. FIG. 5 shows the restriction of the use frequency band of UL. In the restriction of the other use frequency bands shown in FIG. 5, the band B can be used in the same manner as the restriction of the use frequency band of the radio repeater apparatus Rep shown in FIG. Further, although the band A can not be used under the restriction of the use frequency band of the wireless repeater apparatus Rep shown in FIG. 4, the restriction of the transmission power of the terminal apparatus UE (about 12 dBm) under the restriction of the other use frequency band shown in FIG. Can be used within the scope of In addition, although the band C can not be used under the restriction of the use frequency band of the wireless repeater apparatus Rep shown in FIG. 4, the restriction of the transmission power of the terminal apparatus UE (about 20 dBm) under the restriction of the other use frequency band shown in FIG. Can be used within the scope of

  For example, among the bands A, B and C shown in FIGS. 4 and 5, the band B is a band originally usable in the wireless communication system according to the present embodiment, and the bands A and C are wireless according to the present embodiment. This is a band that can be newly used by the communication system. Then, the radio repeater apparatus Rep corresponds to the band B which can be originally used, but does not correspond to the band A and the band C which can be newly used. For this reason, the radio repeater apparatus Rep requires the restriction of the use frequency band shown in FIG.

  FIG. 6 is a flowchart showing an example of the communication control method according to the present embodiment. An example of the operation of the base station apparatus eNB according to the present embodiment will be described with reference to FIG. Here, the restrictions of the used frequency band shown in FIGS. 4 and 5 will be described as an example. Further, among the bands A, B and C shown in FIGS. 4 and 5, the band B is a band originally usable in the wireless communication system according to the present embodiment, and the bands A and C are wireless according to the present embodiment. This is a band that can be newly used by the communication system. Then, the radio repeater apparatus Rep corresponds to the band B which can be originally used, but does not correspond to the band A and the band C which can be newly used. Moreover, one terminal device UE will be described here to simplify the description.

(Step S101) The delay amount information acquiring unit 11 acquires delay amount information indicating the delay amount of wireless communication between the terminal device UE and the base station apparatus eNB. Here, a method of acquiring delay amount information will be described.

  In the present embodiment, the delay amount information acquisition unit 11 is based on the reception result of the uplink (UL) random access channel (RACH) signal and the timing correction value (TA command (Timing Advance command)). Get delay amount information. In the wireless communication system according to the present embodiment, when communication is started between the terminal device UE and the base station device eNB, a RACH signal is used. The RACH signal is used to synchronize the UL signal between the terminal apparatus UE and the base station apparatus eNB. The base station apparatus eNB generates a "TA command" based on the reception result of the RACH signal received from the terminal apparatus UE, and transmits the generated "TA command" to the terminal apparatus UE.

  FIG. 7 is a schematic sequence chart according to the RACH signal. The transmission procedure of the signal related to the RACH signal will be described with reference to FIG.

(Step S1) The base station apparatus eNB broadcasts a RACH related parameter to the terminal apparatus UE by a broadcast signal.

(Step S2) The terminal device UE transmits a RACH signal to the base station device eNB using the RACH related parameter notified from the base station device eNB.

(Step S3) The base station apparatus eNB generates "TA command" based on the reception result of the RACH signal received from the terminal apparatus UE, and generates "TA command" for the terminal apparatus UE that has transmitted the RACH signal. Send ".

(Step S4) The terminal device UE transmits a data signal of UL using the “TA command” received from the base station device eNB. At this time, the terminal device UE notifies the base station device eNB of a UL data signal whether or not the restriction of the other used frequency bands shown in FIG. 5 can be applied.

FIG. 8 is an explanatory diagram of “TA command”. In FIG. 8, the UL timing correction value “N _TA × T _S [seconds]” by “TA command” is used when the terminal apparatus UE transmits an uplink radio frame (UL Radio Frame). It is a transmission timing correction value of a UL radio frame with respect to a downlink radio frame (DL Radio Frame (DL Radio Frame)). Downlink (DL) is a link in a direction from the base station apparatus eNB to the terminal apparatus UE. T _S is “1/30720000” seconds. As N _TA, for example, _"N TA = TA × 16, where, TA is the one of an integer from 0 to 1282" is used. This UL timing correction value (TA command) enables timing correction from 0 to 670 [microseconds]. This synchronizes UL signals for the terminal device UE in the range of approximately 0 to 100 [km] as the radius of the coverage size converted to the round trip delay time between the base station device eNB and the terminal device UE. It corresponds to what you can do.

The delay amount information acquiring unit 11 is a terminal device based on the “TA command” transmitted to the terminal device UE with respect to the RACH signal at the time of initial access among the RACH signals that the base station device eNB has received from the terminal device UE in the past. The distribution of round trip delay time (round trip delay time distribution) for the UE is calculated. The delay amount information acquiring unit 11 determines a representative round trip delay time based on the round trip delay time distribution. The representative round trip delay time is an example of delay amount information. Examples of the representative round trip delay time include the following.
(Example 1 of representative round trip delay time) 95% tile value in round trip delay time distribution.
(Example 2 of representative round trip time) The longest round trip time in the round trip time distribution.
(Example 3 of representative round trip delay time) Round trip delay time of the maximum distribution number in round trip delay time distribution.
(Example 4 of representative round trip time) An average value of round trip time in the round trip time distribution.

  Note that “TA command” is also transmitted to the terminal apparatus UE in response to the RACH signal at the time of synchronization loss. However, “TA command” at the time of out of synchronization is a difference value from the previous “TA command”. When processing in consideration of this difference value, “TA command” at the time of out of synchronization may be used to calculate the round trip delay time distribution.

The explanation is returned to FIG.
(Step S102) The wireless control unit 12 determines whether the delay amount represented by the delay amount information acquired by the delay amount information acquiring unit 11 is less than a threshold. As a result of this determination, if it is less than the threshold value, the process proceeds to step S103, and if it is more than the threshold value, the process proceeds to step S104.

(Step S103) The radio control unit 12 applies the restriction of the use frequency band of the radio repeater apparatus Rep shown in FIG. 4 as the restriction of the use frequency band applied to the radio communication between the terminal apparatus UE and the base station apparatus eNB. do not do. When the radio control unit 12 is notified from the terminal device UE that the restriction of the other use frequency band shown in FIG. 5 can be applied in the above step S4, the radio control unit 12 is shown in FIG. Apply the restrictions of other use frequency bands. Therefore, the band A, the band B, and the band C can be used for UL wireless communication between the terminal device UE and the base station apparatus eNB.

  On the other hand, in the case where the radio control unit 12 is notified by the terminal device UE that the restriction of the other used frequency bands shown in FIG. The restriction of the use frequency band of the wireless repeater apparatus Rep shown in FIG. 4, that is, the restriction of the original use frequency band of the wireless communication system according to the present embodiment is applied. Therefore, only the band B can be used for UL wireless communication between the terminal device UE and the base station device eNB.

(Step S104) The radio control unit 12 applies the restriction of the use frequency band of the radio repeater apparatus Rep shown in FIG. 4 as the restriction of the use frequency band applied to the radio communication between the terminal apparatus UE and the base station apparatus eNB. Do. Therefore, only the band B can be used for UL wireless communication between the terminal device UE and the base station device eNB.

  FIG. 9 is an explanatory diagram of a delay amount threshold determination method according to the present embodiment. The delay amount threshold determination method according to the present embodiment will be described with reference to FIG. Here, as in the description of FIG. 6 above, the restriction of the used frequency band shown in FIGS. 4 and 5 will be described as an example.

  In FIG. 9, the threshold used for delay amount threshold determination is dt. The threshold dt is set in advance in the base station apparatus eNB. The threshold value dt is for the purpose of distinguishing between the case where the communication path passes through the wireless repeater device Rep and the case where the communication route does not pass through the wireless repeater device Rep with regard to the delay amount of the wireless communication between the terminal device UE and the base station device eNB. It is determined. For example, the threshold dt is determined based on the distance between the base station apparatus eNB and the wireless repeater apparatus Rep. Also, the threshold value dt may be determined in consideration of the amount of delay increased by passing through the wireless repeater device Rep.

  In the base station apparatus eNB, the delay amount information acquisition unit 11 acquires delay amount information of the terminal device UE_1 and delay amount information of the terminal device UE_2. The delay amount represented by the delay amount information of the terminal device UE_1 is d1. The delay amount represented by the delay amount information of the terminal device UE_2 is d2.

  The radio control unit 12 compares the delay amount d1 of the terminal device UE_1 with the threshold value dt. As a result of this comparison, the delay amount d1 of the terminal device UE_1 is less than the threshold dt. Accordingly, the radio control unit 12 does not apply the restriction of the use frequency band of the radio repeater device Rep as the restriction of the use frequency band applied to the radio communication between the terminal device UE_1 and the base station device eNB. The radio control unit 12 applies the restriction of the other use frequency band shown in FIG. 5 to the terminal device UE_1 when the terminal device UE_1 can apply the restriction of the other use frequency band shown in FIG. . As a result, UL wireless communication between the terminal device UE_1 and the base station apparatus eNB can be newly used in the wireless communication system in addition to the band B originally usable in the wireless communication system according to the present embodiment. Band A and band C can be used.

  On the other hand, when the terminal device UE_1 can not apply the restriction of the other use frequency band shown in FIG. 5, the radio control unit 12 applies the use frequency of the radio repeater apparatus Rep shown in FIG. 4 to the terminal device UE_1. The band restriction, that is, the restriction of the original used frequency band of the wireless communication system according to the present embodiment is applied. Thereby, only the band B can be used for the wireless communication of UL between the terminal device UE_1 and the base station apparatus eNB due to the restriction of the used frequency band of the terminal device UE_1.

  The radio control unit 12 compares the delay amount d2 of the terminal device UE_2 with the threshold value dt. As a result of this comparison, the delay amount d2 of the terminal device UE_2 is larger than the threshold dt. Thereby, the radio control unit 12 applies the restriction of the use frequency band of the radio repeater device Rep as the restriction of the use frequency band applied to the radio communication between the terminal device UE_2 and the base station device eNB. Thereby, only the band B can be used for the UL radio communication between the terminal device UE_2 and the base station device eNB due to the restriction of the frequency band used by the radio repeater device Rep. For the terminal device UE_2, by using only the band B due to the restriction of the use frequency band of the wireless repeater device Rep, the wireless communication with the base station device eNB via the wireless repeater device Rep is not hindered. can do.

  According to this embodiment, delay amount information representing a delay amount of wireless communication between the terminal device UE and the base station device eNB is acquired, and based on the delay amount information, between the terminal device UE and the base station device eNB It is determined whether or not the restriction of the use frequency band of the wireless repeater device Rep is applied as the restriction of the use frequency band applied to the wireless communication. Thereby, the restriction | limiting of the use frequency of radio | wireless repeater apparatus Rep can be applied appropriately with respect to the terminal device UE which carries out radio | wireless communication with the base station apparatus eNB.

  For example, when the delay amount represented by the delay amount information of the terminal apparatus UE is less than the threshold, it can be determined that the terminal apparatus UE is in wireless communication with the base station apparatus eNB without passing through the wireless repeater apparatus Rep. The restriction of the use frequency of the wireless repeater apparatus Rep is not applied. Thereby, since the restriction of the use frequency of the terminal apparatus UE can be applied to the terminal apparatus UE, the use frequency of the terminal apparatus UE can be applied regardless of the restriction of the use frequency of the radio repeater apparatus Rep. It can contribute to utilization of frequency resources within the limits.

  On the other hand, when the delay amount represented by the delay amount information of the terminal apparatus UE is equal to or more than the threshold value, it can be determined that the terminal apparatus UE is in wireless communication with the base station apparatus eNB via the wireless repeater apparatus Rep. The restriction of the use frequency of the repeater device Rep is applied. Thereby, for the terminal apparatus UE, by applying the restriction of the use frequency of the wireless repeater apparatus Rep, wireless communication with the base station apparatus eNB via the wireless repeater apparatus Rep is not disturbed. be able to.

  According to the present embodiment, when a frequency band that can be newly used for the wireless communication system is provided, while the existing wireless repeater device Rep that does not correspond to the new frequency band is continuously used, the original In addition to the frequency band of the above, it is possible to operate to utilize a new frequency band. For example, for a wireless communication system operating only in the band B due to the restriction of the use frequency in FIG. 4, new bands A and C can be further used by changing the restriction on the use frequency in FIG. Suppose that it became. In this case, while continuing to use the existing wireless repeater device Rep that is compatible with the original band B but not the new band A and the band C, in addition to the original band B, a new It is possible to operate to use the wide band A and the wide band C as well. As a result, it is possible to reduce the cost and time for replacing the existing wireless repeater device Rep with a new wireless repeater device compatible with the band A and the band C, and to effectively use frequency resources.

  In the case where the first wireless repeater device corresponding only to the original band B and the second wireless repeater device corresponding to the new band A and the band C in addition to the original band B are mixed. When the delay amount represented by the delay amount information of the terminal apparatus UE is equal to or more than the threshold, the restriction of the use frequency of the first wireless repeater device (only the band B can be used) is applied, and the delay represented by the delay amount information of the terminal apparatus UE When the amount is less than the threshold, it is assumed that the restriction of the use frequency of the first wireless repeater device (only the band B can be used) is applied. However, when it is possible to distinguish between the case where the communication route passes through the first wireless repeater device and the case where the communication route passes through the second wireless repeater device according to the delay amount of the wireless communication between the terminal device UE and the base station device eNB. And a threshold for performing the discrimination, wherein the threshold restricts the use frequency of the first wireless repeater device (only band B can be used) or restricts the use frequency of the second wireless repeater device (band A and band B Or band C may be used).

  Although the embodiments of the present invention have been described in detail with reference to the drawings, the specific configuration is not limited to this embodiment, and design changes and the like within the scope of the present invention are also included.

  For example, as a wireless communication system of the above-described embodiment, the present invention can be applied to a wireless communication system called Long Term Evolution (LTE) defined by 3rd Generation Partnership Project (3GPP).

In addition, a computer program for realizing the functions of the base station apparatus eNB described above may be recorded in a computer readable recording medium, and the computer system may read and execute the program recorded in the recording medium. Good. Note that the “computer system” referred to here may include an OS and hardware such as peripheral devices.
The “computer readable recording medium” is a writable non-volatile memory such as a flexible disk, an optical magnetic disk, a ROM, a flash memory, etc., a portable medium such as a DVD (Digital Versatile Disc), etc. Storage devices such as hard disks.

Furthermore, the “computer-readable recording medium” is a volatile memory (for example, DRAM (Dynamic Memory) inside a computer system that becomes a server or client when a program is transmitted via a network such as the Internet or a communication line such as a telephone line) As Random Access Memory), it is assumed that the program which holds the program for a fixed time is included.
The program may be transmitted from a computer system in which the program is stored in a storage device or the like to another computer system via a transmission medium or by transmission waves in the transmission medium. Here, the “transmission medium” for transmitting the program is a medium having a function of transmitting information, such as a network (communication network) such as the Internet or a communication line (communication line) such as a telephone line.
Further, the program may be for realizing a part of the functions described above. Furthermore, it may be a so-called difference file (difference program) that can realize the above-described functions in combination with a program already recorded in the computer system.

11 ... delay amount information acquisition unit, 12 ... radio control unit, 21 ... radio communication unit, 22 ... CPU, 23 ... storage unit, 31 ... radio control program, 32 ... frequency band restriction information, eNB ... base station apparatus, UE_1, UE_2: Terminal device, Rep: Wireless repeater device

Claims (4)

In a base station apparatus that performs wireless communication with a terminal apparatus,
A delay amount information acquiring unit that acquires delay amount information representing a delay amount of wireless communication between the terminal device and the base station device;
Based on the delay amount information acquired by the delay amount information acquisition unit, it is provided corresponding to the base station device as a restriction of a use frequency band applied to wireless communication between the terminal device and the base station device. A wireless control unit that determines whether to apply the restriction of the use frequency band of the wireless repeater device ;
The available frequency band that the wireless repeater device can use is the first band,
An available frequency band that can be used by the base station apparatus is the first band and another band different from the first band,
The wireless control unit
When the delay amount represented by the delay amount information is equal to or greater than a threshold, the restriction of the use frequency band of the wireless repeater device is applied.
When the amount of delay represented by the amount of delay information is less than a threshold, when the terminal device can use the other band, the restriction of the use frequency band of the wireless repeater device is not applied, while the terminal When the device can not use the other band, apply the restriction of the use frequency band of the wireless repeater device,
Base station device. The delay amount information acquiring unit is a transmission timing of an uplink radio frame for a downlink radio frame, which the base station apparatus has transmitted to the terminal apparatus with respect to a random access channel signal received by the base station apparatus from the terminal apparatus. Acquiring the delay amount information based on the correction value;
The base station apparatus according to claim 1. In a communication control method of a base station apparatus performing wireless communication with a terminal apparatus,
A delay amount information acquiring step in which the base station device acquires delay amount information indicating a delay amount of wireless communication between the terminal device and the base station device;
The base station apparatus as a restriction of a use frequency band applied to wireless communication between the terminal apparatus and the base station apparatus based on the delay amount information acquired in the delay amount information acquiring step. a communication control method comprising a wireless control step of determining whether to apply the constraints used frequency band of the radio repeater device which is provided in correspondence with,
The available frequency band that the wireless repeater device can use is the first band,
An available frequency band that can be used by the base station apparatus is the first band and another band different from the first band,
The base station apparatus
When the delay amount represented by the delay amount information is equal to or greater than a threshold, the restriction of the use frequency band of the wireless repeater device is applied.
When the amount of delay represented by the amount of delay information is less than a threshold, when the terminal device can use the other band, the restriction of the use frequency band of the wireless repeater device is not applied, while the terminal When the device can not use the other band, apply the restriction of the use frequency band of the wireless repeater device,
Communication control method. In the computer of the base station apparatus which performs wireless communication with the terminal device,
A delay amount information acquisition function of acquiring delay amount information representing a delay amount of wireless communication between the terminal apparatus and the base station apparatus;
Based on the delay amount information acquired by the delay amount information acquiring function, it is provided corresponding to the base station device as a restriction of a use frequency band applied to wireless communication between the terminal device and the base station device. A computer program for realizing a wireless control function of determining whether to apply the restriction of the use frequency band of the wireless repeater device ,
The available frequency band that the wireless repeater device can use is the first band,
An available frequency band that can be used by the base station apparatus is the first band and another band different from the first band,
The wireless control function is
When the delay amount represented by the delay amount information is equal to or greater than a threshold, the restriction of the use frequency band of the wireless repeater device is applied.
When the amount of delay represented by the amount of delay information is less than a threshold, when the terminal device can use the other band, the restriction of the use frequency band of the wireless repeater device is not applied, while the terminal When the device can not use the other band, apply the restriction of the use frequency band of the wireless repeater device,
Computer program.

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