JP2017085525A - Base station device, communication method, and program - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a base station device and the like that can allocate a different frequency without measuring the different frequency.SOLUTION: A base station device comprises: a radio communication unit for communicating with a terminal device by radio; a delay information acquisition unit for acquiring information on delay in a signal communicated by radio with the terminal device by the radio communication unit; and a frequency determination unit for determining a frequency which the terminal device can use for communication on the basis of the information acquired by the delay information acquisition unit.SELECTED DRAWING: Figure 1

Description

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

There is a wireless communication system in which a base station device and a terminal device communicate wirelessly. The terminal device is wirelessly connected to one of the base station devices, accommodated in the base station device, and communicates with the base station device by radio.
Here, there is a case where one base station apparatus has a function of performing wireless communication using a plurality of different frequencies, and one terminal apparatus performs wireless communication using the plurality of different frequencies. It may have a function. In this case, the base station apparatus performs allocation (initial allocation or switching allocation) of frequencies used for radio communication to the terminal apparatus. Thus, inter-frequency carrier aggregation (CA) or load sharing (MLB) can be realized.

3GPP (3rd Generation Partnership Project), TS36.331, “Evolved Universal Terrestrial Radio Access (E-UTRA); 3GPP (3rd Generation Partnership Project), TS 36.211, “Evolved Universal Terrestrial Radio Access (E-UTRA); Physical Channels and Modulation”, V12.1.0 (201). 3GPP (3rd Generation Partnership Project), TS36.213, “Evolved Universal Terrestrial Radio Access (E-UTRA); Physical layer procedures”, V12.3.0 (201).

  However, in the base station device, when assigning another different frequency (different frequency) to the terminal device that communicates by radio at the currently assigned frequency, it is necessary to perform measurement on the different frequency. there were. In this measurement, for example, transmission / reception of an RRC message or measurement GAP processing is required, which may take a lot of time, and a large amount of power consumption (for example, battery power consumption) occurs in the terminal device. was there.

  The present invention has been made in view of such circumstances, and an object of the present invention is to provide a base station apparatus, a communication method, and a program capable of assigning different frequencies without performing measurement of different frequencies. .

  In order to solve the above problems, a base station apparatus according to an aspect of the present invention relates to a radio communication unit that communicates with a terminal apparatus by radio, and a delay of a signal that communicates by radio with the terminal apparatus by the radio communication unit. A base station apparatus comprising: a delay information acquisition unit that acquires information; and a frequency determination unit that determines a frequency that can be used for communication by the terminal device based on the information acquired by the delay information acquisition unit. is there.

  One aspect of the present invention includes a correspondence storage unit that stores a correspondence between information about the delay and a frequency that can be used for the communication in the base station device, and the frequency determination unit is A configuration that determines the frequency based on the stored correspondence may be used.

  According to an aspect of the present invention, in the base station apparatus, the delay information acquisition unit is transmitted from the terminal apparatus according to a downlink radio frame transmitted by the radio communication unit and received by the radio communication unit A configuration may be used in which the information is acquired based on a correction value of a transmission timing of an uplink radio frame.

  According to an aspect of the present invention, in the base station device, the delay information acquisition unit transmits the random access channel transmitted when the terminal device first accesses the terminal device by the wireless communication unit to the terminal device. A configuration may be used in which the information is acquired based on the transmission timing correction value.

  According to an aspect of the present invention, in the base station device, the delay information acquisition unit calculates a round trip delay time for the terminal device based on the correction value of the transmission timing, and the information is obtained based on the round trip delay time. The acquiring configuration may be used.

  According to one aspect of the present invention, in the base station apparatus, a configuration in which the information on the delay is distance information may be used.

  One aspect of the present invention includes a carrier aggregation execution unit that performs carrier aggregation processing using the frequency determined by the frequency determination unit in a base station apparatus, and the frequency determination unit A configuration may be used in which a frequency used for carrier aggregation is determined as a frequency that can be used for communication by the terminal device when the frequency is equal to or lower than a predetermined first threshold.

  One aspect of the present invention includes a load distribution execution unit that executes a load distribution process using the frequency determined by the frequency determination unit in a base station apparatus, wherein the frequency determination unit A configuration may be used in which a frequency used for load distribution is determined as a frequency that can be used for communication by the terminal device when the frequency is equal to or lower than a predetermined second threshold.

  In order to solve the above problem, in a communication method according to one aspect of the present invention, a wireless communication unit wirelessly communicates with a terminal device, and a delay information acquisition unit wirelessly communicates with the terminal device by the wireless communication unit. In the base station apparatus that acquires information on a delay of a signal to be communicated, and a frequency determination unit determines a frequency that can be used for communication by the terminal device based on the information acquired by the delay information acquisition unit. It is a communication method.

  In order to solve the above problems, a program according to an aspect of the present invention includes a step of wirelessly communicating with a terminal device of a computer included in a base station device, and information regarding a delay of a signal wirelessly communicated with the terminal device. And a step of determining a frequency that can be used for communication by the terminal device based on the acquired information.

  According to the present invention, it is possible to assign different frequencies without performing measurement of different frequencies.

1 is a block diagram showing a schematic configuration of a wireless communication system according to an embodiment of the present invention. It is a block diagram which shows the schematic structure of the base station apparatus which concerns on one Embodiment of this invention. It is a figure which shows an example of the table which stored the propriety for every terminal device regarding the carrier aggregation and load distribution which concern on one Embodiment of this invention. It is a figure which shows an example of the table which stored the delay time and distance for every terminal device which concern on one Embodiment of this invention. It is a figure showing an example of a table which stored correspondence with delay time and distance concerning one embodiment of the present invention, and usable frequency. It is a figure for demonstrating a response | compatibility with the distance and usable frequency which concern on one Embodiment of this invention. It is a sequence diagram which shows an example of the procedure of the process in which the base station apparatus and terminal device which concern on one Embodiment of this invention establish a wireless connection. It is a flowchart which shows an example of the procedure of the process performed in the base station apparatus which concerns on one Embodiment of this invention.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
FIG. 1 is a block diagram showing a schematic configuration of a wireless communication system 1 according to an embodiment of the present invention.
The wireless communication system 1 includes a base station device 11 and terminal devices 31-1 to 31-3 (may be called “users” or the like).
The base station apparatus 11 is accommodated by wireless connection with the terminal apparatuses 31-1 to 31-3 existing in the communication area 21 of the base station apparatus 11, and communicates with the terminal apparatuses 31-1 to 31-3 by radio. .
Each of the terminal devices 31-1 to 31-3 is, for example, a mobile phone terminal device such as a smartphone.

In FIG. 1, one base station apparatus 11 is shown, but the wireless communication system 1 includes a plurality of base station apparatuses.
Moreover, although the three terminal devices 31-1 to 31-3 are shown in FIG. 1, the wireless communication system 1 normally includes a larger number of terminal devices.
In the present embodiment, an LTE (Long Term Evolution) system is assumed, the base station device 11 is an eNB (evolved Node B), and the terminal devices 31-1 to 31-3 are UEs (User Equipment). is there.

FIG. 2 is a block diagram showing a schematic configuration of the base station apparatus 11 according to an embodiment of the present invention.
The base station apparatus 11 includes a wireless communication unit 101, a wired communication unit 102, an input / output unit 103, a storage unit 104, and a control unit 105. The control unit 105 includes a delay information acquisition unit 121, a frequency determination unit 122, a carrier aggregation execution unit 123, and a load distribution execution unit 124.

The wireless communication unit 101 communicates with the terminal devices 31-1 to 31-3 wirelessly.
The wired communication unit 102 communicates with other base station devices or higher-level devices by wire. This communication may be performed wirelessly.
The input / output unit 103 inputs information and outputs information.
As an example, the input / output unit 103 includes an operation unit, and inputs information corresponding to an operation performed by the operator (person) on the operation unit. As an example, the input / output unit 103 inputs information from another device. Note that the operator may be, for example, a telecommunications carrier or other general users.
As an example, the input / output unit 103 includes a display unit, and displays information on the screen of the display unit. As an example, the input / output unit 103 includes a sound output unit, and outputs sound information from the sound output unit. As an example, the input / output unit 103 outputs information to another device.
The storage unit 104 stores information.

The control unit 105 controls various processes in the base station apparatus 11. The control unit 105 may perform control other than the control shown in the present embodiment.
The delay information acquisition unit 121 acquires information (referred to as “delay information” in this embodiment) regarding delays that occur in wireless communication between the own device (base station device 11) and the terminal devices 31-1 to 31-3. .
Based on the delay information acquired by the delay information acquisition unit 121 for the terminal devices 31-1 to 31-3, the frequency determination unit 122 assigns frequencies to be assigned to wireless communication with the terminal devices 31-1 to 31-3. judge.
The carrier aggregation execution unit 123 executes carrier aggregation processing.
The load distribution execution unit 124 executes load distribution processing.

FIG. 3 is a diagram illustrating an example of a table 1011 that stores the availability of each of the terminal devices 31-1 to 31-3 regarding carrier aggregation and load distribution according to an embodiment of the present invention.
The table 1011 is stored in the storage unit 104.
The table 1011 includes identification information (referred to as “terminal ID” in the present embodiment) of the terminal devices 31-1 to 31-3 and whether or not carrier aggregation of the terminal devices 31-1 to 31-3 is possible (in the present embodiment). , “CA availability”) and the availability of load distribution (in this embodiment, “MLB availability”) of the terminal devices 31-1 to 31-3 are stored in association with each other. Further, the table 1011 stores frequencies that can be used for wireless communication by the terminal devices 31-1 to 31-3 in the columns of CA availability and MLB availability.

In the example of FIG. 3, the terminal device whose terminal ID is 001 (for example, the terminal device 31-1) can perform carrier aggregation, and the frequency f1 and the frequency f2 (values different from f1 and f2) in the carrier aggregation. The frequency f1 and the frequency f2 can be used in the load distribution.
The terminal device with the terminal ID 002 (for example, the terminal device 31-2) is the same as the terminal device with the terminal ID 001.
In addition, the terminal device with the terminal ID 003 (for example, the terminal device 31-3) cannot perform carrier aggregation, cannot perform load distribution, and can use only the frequency f1.

In the present embodiment, in each of the terminal devices 31-1 to 31-3, the frequency that can be used may be different for carrier aggregation and load distribution. The frequency is managed separately.
As another configuration example, in each of the terminal devices 31-1 to 31-3, a configuration in which frequencies that can be used are the same for carrier aggregation and load distribution may be used. In this configuration, the base station apparatus 11 collectively manages the feasibility of use and the frequencies that can be used for the terminal apparatuses 31-1 to 31-3 by carrier aggregation and load distribution. Also good.

  Here, the information stored in the table 1011 is, for example, from the terminal devices 31-1 to 31-3 when the base station device 11 and the terminal devices 31-1 to 31-3 are first wirelessly connected. It is transmitted to the base station apparatus 11. Thereby, the control unit 105 of the base station apparatus 11 acquires the information and stores it in the table 1011.

FIG. 4 is a diagram showing an example of a table 1021 storing delay times and distances for the terminal devices 31-1 to 31-3 according to the embodiment of the present invention.
The table 1021 is stored in the storage unit 104.
The table 1021 includes identification information (terminal ID) of the terminal devices 31-1 to 31-3, a delay time generated in wireless communication with the terminal devices 31-1 to 31-3, and a distance corresponding to the delay time. Are stored in association with each other. The distance is a distance between the base station device 11 and each of the terminal devices 31-1 to 31-3, and may be an estimated value.
Here, usually, the longer the delay time, the larger the distance, and the smaller the delay time, the smaller the distance.

In the example of FIG. 4, the terminal device whose terminal ID is 001 (for example, the terminal device 31-1) has a delay time of 0.1 (the unit is seconds, and so on), and the distance is 5 ( The unit is meters, and so on.
In addition, the terminal device whose terminal ID is 002 (for example, the terminal device 31-2) has a delay time of 0.3 and a distance of 15.
In addition, the terminal device whose terminal ID is 003 (for example, the terminal device 31-3) has a delay time of 0.2 and a distance of 10.
In the example of FIG. 4, the delay information acquisition unit 121 calculates the distance from the delay time using a relational expression in which the delay time and the distance are proportional. As another configuration example, a relational expression other than proportionality may be used.

  Here, the delay time information stored in the table 1021 is obtained, for example, when the base station device 11 and each of the terminal devices 31-1 to 31-3 are wirelessly connected for the first time. The unit 121 obtains it using the UL Timing correction value (TA Command) and stores it in the table 1021. Further, the delay information acquisition unit 121 calculates distance information based on the delay time information and stores the distance information in the table 1021.

FIG. 5 is a diagram showing an example of a table 1031 storing correspondences between delay times and distances and usable frequencies according to an embodiment of the present invention.
The table 1031 is stored in the storage unit 104. In the present embodiment, the information stored in the table 1031 is set and stored in advance, for example. Further, the information stored in the table 1031 may be received from, for example, a host device, set (may be rewritten), and stored.

The table 1031 includes a delay time, a distance, whether carrier aggregation is possible and frequencies that can be used in carrier aggregation (referred to as “usable frequency (CA)” in this embodiment), whether load balancing is possible, and load. The frequencies that can be used in the distribution (in this embodiment, referred to as “usable frequencies (MLB)”) are stored in association with each other.
Here, as the relational expression between the delay time and the distance, the same expression as the relational expression between the delay time and the distance stored in the table 1021 shown in FIG. 4 is used.

In the example of FIG. 5, when the delay time in wireless communication between the base station apparatus 11 and the terminal apparatuses 31-1 to 31-3 exceeds 0.21 (the base station apparatus 11 and the terminal apparatuses 31-1 to 31-31). 3 is more than 10.5), from the viewpoint of the distance, only the frequency f2 may be used in the wireless communication between the base station device 11 and the terminal devices 31-1 to 31-3. Yes, carrier aggregation is impossible, and load distribution is not possible.
On the other hand, when the delay time in wireless communication between the base station device 11 and the terminal devices 31-1 to 31-3 is 0.21 or less (the base station device 11 and the terminal devices 31-1 to 31-3 When the distance is 10.5 or less), from the viewpoint of the distance, the frequency f1 and the frequency f2 may be used in the wireless communication between the base station device 11 and the terminal devices 31-1 to 31-3. Yes, carrier aggregation is possible, and load distribution is possible.

Here, in the present embodiment, the first threshold relating to the delay time for determining whether or not carrier aggregation is possible is 0.21 (the first threshold relating to distance is 10.5).
In the present embodiment, the second threshold value related to the delay time for determining whether or not load distribution is possible is 0.21 (the second threshold value related to the distance is 10.5).
In the present embodiment, the same value is used for the first threshold value related to carrier aggregation and the second threshold value related to load distribution, but different values may be used as other configuration examples.

In this embodiment, it is assumed that the availability may differ between carrier aggregation and load distribution, and the availability is managed separately.
As another configuration example, a configuration in which the availability is the same for carrier aggregation and load distribution may be used. In this configuration, the base station apparatus 11 may collectively manage whether or not implementation is possible by carrier aggregation and load distribution.

  In the present embodiment, the information stored in the table 1031 shown in FIG. 5 can be commonly applied to arbitrary terminal devices 31-1 to 31-3. As another configuration example, the base station device 11 stores a plurality of types of tables such as the table 1031 illustrated in FIG. 5, and each of the terminal devices 31-1 to 31-3 includes a plurality of types. A configuration that refers to information stored in one corresponding table may be used.

FIG. 6 is a diagram for explaining the correspondence between the distance and the usable frequency according to the embodiment of the present invention.
In FIG. 6, the base station apparatus 11, the entire communication area 21 of the base station apparatus 11, the nearby communication area (proximity communication area 211) and the distant communication area (distant A communication area 221) and two terminal devices 31-1, 31-2 are shown.

Here, the entire communication area 21 is the same as that shown in FIG.
Of the entire communication area 21, a part of the area where the distance from the base station apparatus 11 is equal to or less than a predetermined threshold is set as a neighborhood communication area 211. Further, in the entire communication area 21, an area where the distance from the base station apparatus 11 exceeds the predetermined threshold is defined as a far communication area 221. A region including the near communication area 211 and the far communication area 221 is the entire communication area 21. Here, the predetermined threshold value regarding the distance is 10.5 (0.21 in the delay time) in the example of the table 1031 shown in FIG.

In the example of FIG. 6, the terminal device 31-1 exists in the near field communication area 211 of the base station device 11. On the other hand, the terminal device 31-2 exists in the far communication area 221 of the base station device 11.
In general, wireless communication using a low frequency enables communication to a far region compared to wireless communication using a high frequency.
In the present embodiment, the frequency f1 = 2 GHz and the frequency f2 = 800 MHz. In the present embodiment, the base station device 11 and the terminal device 31-1 existing in the nearby communication area 211 (the same applies to other terminal devices) use any of the frequencies f1 and f2. Wireless communication is possible. In the present embodiment, the base station device 11 and the terminal device 31-2 existing in the remote communication area 221 (same for other terminal devices) can perform wireless communication using only the frequency f2. Suppose that This information is determined by calculation or measurement in advance or at an arbitrary timing, and is set in the table 1031 shown in FIG.

FIG. 7 is a sequence diagram illustrating an example of a process procedure for establishing a wireless connection between the base station apparatus 11 and the terminal apparatus 31-1 according to an embodiment of the present invention. The same applies to terminal devices other than the terminal device 31-1.
Here, a generally known sequence may be used as this sequence.

(Process T1)
The base station apparatus 11 gives parameters related to a random access channel (RACH) to the terminal apparatus 31-1 existing under the cell (communication area) of the own apparatus (the base station apparatus 11). Inform. The terminal device 31-1 receives the parameter.
(Process T2)
The terminal apparatus 31-1 transmits RACH to the base station apparatus 11 using the received parameter. The base station apparatus 11 receives the RACH. Thereby, in the base station apparatus 11, the delay information acquisition part 121 can detect the delay amount (in this embodiment, round-trip delay amount) in the radio | wireless communication with the terminal device 31-1.
(Process T3)
The base station apparatus 11 transmits a UL Timing correction value (TA Command) to the terminal apparatus 31-1. The terminal device 31-1 receives the UL Timing correction value.
(Process T4)
The terminal device 31-1 transmits UL data to the base station device 11. The base station apparatus 11 receives the UL data.
Here, the UL Timing correction value (TA Command) is a command for correcting a round-trip delay amount in wireless communication between the base station apparatus 11 and the terminal apparatus 31-1. By transmitting the UL Timing correction value to the terminal device 31-1, the base station device 11 adjusts the transmission timing of the uplink (UL: Up Link) signal from the terminal device 31-1 to the base station device 11.
In the base station apparatus 11, the delay information acquisition unit 121 can detect the distance from the terminal apparatus 31-1 based on the UL Timing correction value. Note that the relationship between the UL Timing correction value and the distance may be set in advance and stored in the storage unit 104, for example.

  Thus, in this embodiment, the delay information acquisition unit 121 is transmitted from the terminal device 31-1 and received by the wireless communication unit 101 in accordance with the downlink radio frame transmitted by the wireless communication unit 101. Information is acquired based on the correction value of the uplink radio frame transmission timing (in this embodiment, the UL Timing correction value). Further, the delay information acquisition unit 121 uses the radio communication unit 101 to transmit the terminal device 31-to the random access channel (RACH) transmitted when the terminal device 31-1 first accesses the own device (base station device 11). Information is acquired based on the correction value of the transmission timing transmitted to 1. The delay information acquisition unit 121 calculates a round trip delay time (round trip delay amount) for the terminal device 31-1 based on the correction value of the transmission timing, and acquires information based on the round trip delay time.

FIG. 8 is a flowchart showing an example of a procedure of processing performed in the base station apparatus 11 according to an embodiment of the present invention.
Although the example of FIG. 8 shows the case where communication is performed between the base station device 11 and the terminal device 31-1, the same applies to the other terminal devices 31-2 to 31-3.

(Step S1)
In the base station apparatus 11, the control unit 105 acquires information (referred to as “terminal information” in the present embodiment) related to the terminal apparatus 31-1 through wireless communication with the terminal apparatus 31-1. The terminal information may include, for example, terminal ID information, frequency information that can be used for carrier aggregation, and frequency information that can be used for load distribution. The control unit 105 stores the acquired terminal information in the table 1011 shown in FIG.

(Step S2)
In the base station apparatus 11, the delay information acquisition unit 121 acquires delay information in wireless communication with the terminal apparatus 31-1. The delay information acquisition unit 121 stores the acquired delay information in the table 1021 shown in FIG.

(Step S3)
In the base station apparatus 11, the frequency determination unit 122 stores the information stored in the table 1011 shown in FIG. 3, the information stored in the table 1021 shown in FIG. 4, and the table 1031 shown in FIG. Based on the received information, in the wireless communication with the terminal device 31, a frequency that can be used for a predetermined process is determined.
Here, in the present embodiment, carrier aggregation processing and load distribution processing are used as the predetermined processing.

(Step S4)
In the base station apparatus 11, the carrier aggregation execution unit 123 uses the frequency determined to be usable for carrier aggregation processing by the frequency determination unit 122 for the terminal apparatus 31-1, and performs carrier aggregation. Execute the process.
Further, in the base station apparatus 11, the load distribution execution unit 124 uses the frequency determined to be usable for the load distribution process by the frequency determination unit 122 for the terminal device 31-1, and loads the load. Perform distributed processing.

As described above, in the base station apparatus 11 in the wireless communication system 1 according to the present embodiment, a delay (or distance) that can perform carrier aggregation or load distribution is set in advance. The base station apparatus 11 detects a delay (or distance) in wireless communication with each of the terminal apparatuses 31-1 to 31-3 and uses it for carrier aggregation or load distribution based on the detection result. Determine the frequencies that can be used.
Thereby, in the base station apparatus 11 in the radio | wireless communications system 1 which concerns on this embodiment, allocation of a different frequency can be performed for each terminal device 31-1 to 31-3, without performing measurement of a different frequency. And in the base station apparatus 11, these can be performed about the terminal device which can perform a carrier aggregation or load distribution. As described above, since the measurement of different frequencies can be omitted, the processing time required for the measurement can be shortened, and the power consumption required for the measurement in the terminal device can be omitted.

As one configuration example, a wireless communication unit (wireless communication unit 101 in the example of FIG. 2) that communicates with a terminal device (terminal devices 31-1 to 31-3 in the example of FIG. 1) wirelessly, and a wireless communication unit A delay information acquisition unit (delay information acquisition unit 121 in the example of FIG. 2) that acquires information related to a delay of a signal that communicates wirelessly with the terminal device, and communication with the terminal device based on the information acquired by the delay information acquisition unit 2 is a base station apparatus (base station apparatus 11 in the example of FIG. 1). The base station apparatus includes a frequency determination unit (frequency determination unit 122 in the example of FIG. 2).
As an example of the configuration, in the base station apparatus, a correspondence storage unit (FIG. 2) that stores correspondences between delay-related information and frequencies that can be used for communication (in the example of FIG. 5, information stored in the table 1031). In this example, the storage unit 104) is provided, and the frequency determination unit determines the frequency based on the correspondence stored by the correspondence storage unit.
As an example of the configuration, in the base station apparatus, the delay information acquisition unit transmits an uplink radio frame transmitted from the terminal apparatus and received by the radio communication unit according to the downlink radio frame transmitted by the radio communication unit. Information is acquired based on the correction value of the transmission timing.
As an example of the configuration, in the base station device, the delay information acquisition unit is connected to the random access channel (RACH) transmitted when the terminal device first accesses its own device (the base station device) by the wireless communication unit. Information is acquired based on the correction value of the transmission timing transmitted to the apparatus.
As an example of the configuration, in the base station device, the delay information acquisition unit calculates a round trip delay time for the terminal device based on the transmission timing correction value, and acquires information based on the round trip delay time.
As an example of the configuration, in the base station apparatus, the information regarding delay is distance information.
As an example of the configuration, the base station apparatus includes a carrier aggregation execution unit (carrier aggregation execution unit 123 in the example of FIG. 2) that performs carrier aggregation processing using the frequency determined by the frequency determination unit, A frequency determination part determines the frequency used for carrier aggregation as a frequency which can be used for communication by a terminal device, when a delay is below a predetermined 1st threshold value.
As an example of the configuration, the base station apparatus includes a load distribution execution unit (load distribution execution unit 124 in the example of FIG. 2) that executes load distribution processing using the frequency determined by the frequency determination unit. When the delay is equal to or less than a predetermined second threshold, the frequency determination unit determines the frequency used for load distribution as a frequency that can be used for communication by the terminal device.

As one configuration example, the wireless communication unit communicates wirelessly with the terminal device, the delay information acquisition unit acquires information regarding the delay of the signal wirelessly communicated with the terminal device by the wireless communication unit, and the frequency determination unit A communication method in the base station device that determines a frequency that can be used for communication by the terminal device based on the information acquired by the information acquisition unit (in the example of FIG. 1, a communication method performed in the base station device 11). It is.
As an example of the configuration, a step of wirelessly communicating with a terminal device to a computer included in the base station device, a step of acquiring information regarding a delay of a signal wirelessly communicated with the terminal device, and a terminal device based on the acquired information And a step of determining a frequency that can be used for communication according to (in the example of FIG. 1, a program executed in the base station apparatus 11).

  As mentioned above, although embodiment of this invention was explained in full detail with reference to drawings, the concrete structure is not restricted to this embodiment, The design change etc. of the range which does not deviate from the summary of this invention are included.

Further, a program for realizing the function of each device (for example, the base station device 11, the terminal devices 31-1 to 31-3, etc.) according to the above-described embodiment is recorded on a computer-readable recording medium. The processing may be performed by causing the computer system to read and execute the program recorded on the recording medium.
Here, the “computer system” may include an operating system (OS) or hardware such as a peripheral device.
The “computer-readable recording medium” means a flexible disk, a magneto-optical disk, a ROM (Read Only Memory), a writable nonvolatile memory such as a flash memory, a portable medium such as a DVD (Digital Versatile Disk), A storage device such as a hard disk built in a computer system.
Further, the “computer-readable recording medium” refers to a volatile memory (for example, DRAM (DRAM) inside a computer system that becomes a server or a client when a program is transmitted through a network such as the Internet or a communication line such as a telephone line. Dynamic Random Access Memory)) that holds a program for a certain period of time is also included.
The program may be transmitted from a computer system storing the program in a storage device or the like to another computer system via a transmission medium or by a transmission wave in the transmission medium. Here, the “transmission medium” for transmitting the program refers to 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 above program may be for realizing a part of the functions described above. Further, the program 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.

DESCRIPTION OF SYMBOLS 1 ... Wireless communication system, 11 ... Base station apparatus, 21 ... Communication area, 31-1 to 31-3 ... Terminal device, 101 ... Wireless communication part, 102 ... Wired communication part, 103 ... Input-output part, 104 ... Memory | storage part , 105 ... control unit, 121 ... delay information acquisition unit, 122 ... frequency determination unit, 123 ... carrier aggregation execution unit, 124 ... load distribution execution unit, 1011, 1021, 1031 ... table, 211 ... near communication area, 221 ... far away Communication area

Claims (10)

A wireless communication unit that communicates with the terminal device wirelessly;
A delay information acquisition unit that acquires information about a delay of a signal that communicates wirelessly with the terminal device by the wireless communication unit;
A frequency determination unit that determines a frequency that can be used for communication by the terminal device based on the information acquired by the delay information acquisition unit;
A base station apparatus comprising: A correspondence storage unit that stores correspondence between information on the delay and a frequency that can be used for the communication;
The frequency determination unit determines the frequency based on the correspondence stored by the correspondence storage unit.
The base station apparatus according to claim 1. The delay information acquisition unit uses a correction value for a transmission timing of an uplink radio frame transmitted from the terminal device and received by the radio communication unit according to a downlink radio frame transmitted by the radio communication unit. Based on said information,
The base station apparatus of any one of Claim 1 or Claim 2. The delay information acquisition unit is based on a correction value of the transmission timing transmitted to the terminal device by the wireless communication unit for a random access channel transmitted when the terminal device first accesses the terminal device. Get information,
The base station apparatus according to claim 3. The delay information acquisition unit calculates a round-trip delay time for the terminal device based on the correction value of the transmission timing, and acquires the information based on the round-trip delay time;
The base station apparatus of any one of Claim 3 or Claim 4. The information on the delay is distance information.
The base station apparatus of any one of Claims 1-5. A carrier aggregation execution unit that executes carrier aggregation processing using the frequency determined by the frequency determination unit,
The frequency determination unit determines a frequency used for carrier aggregation as a frequency that can be used for communication by the terminal device when the delay is equal to or less than a predetermined first threshold.
The base station apparatus according to any one of claims 1 to 6. Using the frequency determined by the frequency determination unit, comprising a load distribution execution unit for executing a load distribution process,
The frequency determination unit determines, as the frequency that can be used for communication by the terminal device, when the delay is equal to or less than a predetermined second threshold,
The base station apparatus according to any one of claims 1 to 7. The wireless communication unit communicates with the terminal device wirelessly,
A delay information acquisition unit acquires information on a delay of a signal wirelessly communicated with the terminal device by the wireless communication unit,
The frequency determination unit determines a frequency that can be used for communication by the terminal device based on the information acquired by the delay information acquisition unit.
A communication method in a base station apparatus. In the computer provided in the base station device,
Communicating wirelessly with a terminal device;
Obtaining information on delay of a signal that communicates wirelessly with the terminal device;
Determining a frequency that can be used for communication by the terminal device based on the acquired information;
A program for running

Images