JP6892133B2 - Communication terminal, wireless communication control method and wireless communication control program - Google Patents

Description

The present disclosure relates to communication terminals, wireless communication control methods and wireless communication control programs.

When a communication terminal called a mobile station and a base station communicate with each other, if a radio wave from a communication device other than the communication target is received, the radio wave may interfere with the communication. Considerated control is required.

Patent Document 1 discloses that a femtocell base station selects a scheduling mode by determining the influence of interference exerted by the femtocell base station on a macrocell base station and a macrocell terminal. Patent Document 2 discloses that a communication terminal removes a replica signal of an interference reference signal from a desired data signal which is a received signal received from a desired station.

Japanese Unexamined Patent Publication No. 2011-254389 Japanese Unexamined Patent Publication No. 2013-106210

By the way, the communication terminals such as smartphones currently used include communication terminals compatible with a plurality of communication carriers (carriers) capable of communicating in a wireless communication network operated by a plurality of communication carriers (carriers). When communication on a wireless communication network provided by a plurality of telecommunications carriers is simultaneously performed on a communication terminal compatible with a plurality of telecommunications carriers, the communication of one telecommunications carrier interferes with the communication of another telecommunications carrier. Affects communications of other carriers. Therefore, in the communication terminal, when communication is performed simultaneously in the wireless communication network provided by a plurality of communication carriers, there arises a problem that normal communication cannot be performed.

Specifically, when communication is performed on a wireless communication network provided by a plurality of telecommunications carriers, the reception sensitivity of the communication terminal is significantly deteriorated, and Registration (location registration, etc.) / Connection (RRC (Radio Resource Control) connection) ) May not be possible. Alternatively, when communication is performed on a wireless communication network provided by a plurality of telecommunications carriers, even if Registration / Connection is established on the communication terminal, the communication of at least one telecommunications carrier is disconnected due to poor reception sensitivity. The problem arises.

The above problem occurs as the frequency band (frequency band) used for communication in the wireless communication network provided by each communication carrier is closer in the communication terminal. In this case, the communication terminal cannot establish the communication of any of the communication carriers and requests the wireless communication network of the communication carrier to reconnect, so that it takes time to complete the communication establishment. It also leads to problems.

Here, as a measure to prevent the influence of the communication of a certain telecommunications carrier when the communication of a plurality of telecommunications carriers is performed at the same time, the communication circuit used for the communication of each telecommunications carrier is used. It is conceivable to insert a filter. However, when the communication circuits and frequency bands are close to each other, it is difficult to attenuate sharply with a filter, which is not an effective countermeasure.

In addition, as another measure, it is expected that the isolation between antennas will be improved by arranging the antennas used for communication of each telecommunications carrier away from each other. However, when it is necessary to provide an antenna in the communication terminal as an implementation of the communication terminal, isolation between the antennas cannot be secured.

On the other hand, even when the antenna is provided outside the communication terminal, if the communication terminal is small, a connector for arranging the antenna used for communication of each communication carrier, an RF (Radio Frequency) component, RF wiring, RF cable, etc. will be close. Therefore, even when the antenna is provided outside the communication terminal, it is difficult to secure isolation between carriers.

An object of the present disclosure is to solve the above-mentioned problems, and to provide a communication terminal, a wireless communication control method, and a wireless communication control program capable of suppressing deterioration of communication quality.

The communication terminal related to this disclosure is
Acquires the first information about the frequency band preferentially used in the communication with the base station operated by the first communication carrier, and the signal strength of the radio signal transmitted by each frequency band included in the first information. With the first communication department
Acquires the second information about the frequency band preferentially used in the communication with the base station operated by the second communication carrier and the signal strength of the radio signal transmitted by each frequency band included in the second information. With the second communication department
A selection unit that selects the first frequency band from the first information and selects the second frequency band from the second information.
When the first signal strength indicating the signal strength of the first frequency band, the second signal strength indicating the signal strength of the second frequency band, and the simultaneous communication by the first frequency band and the second frequency band are performed. Based on the amount of deterioration of the first reception sensitivity of the first communication unit and the amount of deterioration of the second reception sensitivity of the second communication unit, the communication by the first frequency band satisfies the first communication quality and the second. It is a communication terminal including a determination unit for determining whether or not communication by a frequency band satisfies the second communication quality.

The wireless communication control method according to the present disclosure is
Acquires the first information about the frequency band preferentially used in the communication with the base station operated by the first communication carrier, and the signal strength of the radio signal transmitted by each frequency band included in the first information. That and
Acquires the second information about the frequency band preferentially used in the communication with the base station operated by the second communication carrier and the signal strength of the radio signal transmitted by each frequency band included in the second information. That and
Selecting the first frequency band from the first information and selecting the second frequency band from the second information
At the time of simultaneous communication between the first signal strength indicating the signal strength of the first frequency band, the second signal strength indicating the signal strength of the second frequency band, and the first frequency band and the second frequency band. Based on the amount of deterioration of the first reception sensitivity with respect to the first signal strength and the amount of deterioration of the second reception sensitivity with respect to the second signal strength, the communication by the first frequency band satisfies the first communication quality and the second. It is a wireless communication control method including determining whether or not communication by a frequency band satisfies the second communication quality.

The wireless communication control program related to this disclosure is
Acquires the first information about the frequency band preferentially used in the communication with the base station operated by the first communication carrier, and the signal strength of the radio signal transmitted by each frequency band included in the first information. That and
Acquires the second information about the frequency band preferentially used in the communication with the base station operated by the second communication carrier and the signal strength of the radio signal transmitted by each frequency band included in the second information. That and
Selecting the first frequency band from the first information and selecting the second frequency band from the second information
At the time of simultaneous communication between the first signal strength indicating the signal strength of the first frequency band, the second signal strength indicating the signal strength of the second frequency band, and the first frequency band and the second frequency band. Based on the amount of deterioration of the first reception sensitivity with respect to the first signal strength and the amount of deterioration of the second reception sensitivity with respect to the second signal strength, the communication by the first frequency band satisfies the first communication quality and the second. It is a wireless communication control program that causes a computer to determine whether or not communication by a frequency band satisfies the second communication quality.

According to the present disclosure, it is possible to provide a communication terminal, a wireless communication control method, and a wireless communication control program capable of suppressing deterioration of communication quality.

It is a block diagram which shows the structural example of the communication terminal which concerns on Embodiment 1. FIG. It is a figure which shows the configuration example of the wireless communication system which concerns on Embodiment 2. FIG. It is a figure for demonstrating that the reception sensitivity deteriorates when two communication units communicate with each other at the same time. It is a figure for demonstrating that the reception sensitivity deteriorates when two communication units communicate with each other at the same time. It is a figure which shows an example of the reception sensitivity deterioration amount information table. It is a figure which shows an example of the RSRP threshold information table. It is a flowchart which shows the operation example of the communication terminal which concerns on Embodiment 2. It is a figure which shows an example of the RSRP threshold information table which concerns on the modification of Embodiment 2. It is a figure which shows an example of the reception sensitivity deterioration amount information table which concerns on the modification of Embodiment 2. It is a block diagram which illustrates the hardware composition of the computer (information processing apparatus) which can realize the communication terminal and the like which concerns on each embodiment of this disclosure.

Hereinafter, embodiments of the present disclosure will be described with reference to the drawings. The following descriptions and drawings have been omitted or simplified as appropriate for the purpose of clarifying the explanation. Further, in each of the following drawings, the same elements are designated by the same reference numerals, and duplicate explanations are omitted as necessary.

(Embodiment 1)
The first embodiment will be described with reference to FIG. FIG. 1 is a block diagram showing a configuration example of a communication terminal according to the first embodiment. The communication terminal 1 is a communication terminal compatible with a plurality of communication carriers. The communication terminal 1 may be, for example, a mobile phone terminal, a smartphone terminal, a tablet terminal, a mobile router, a personal computer device, or the like. The communication terminal 1 includes a first communication unit 11, a second communication unit 12, a selection unit 13, and a determination unit 14.

The first communication unit 11 acquires first information regarding a frequency band that is preferentially used in communication with a base station (not shown) operated by the first communication carrier. In addition, the first communication unit 11 acquires the signal strength of the radio signal transmitted by each frequency band included in the first information.

The frequency band is information indicating a frequency band, and may be, for example, an Operating Band specified in 3GPP (Third Generation Partnership Project) TS 25.101. Further, the preferentially used frequency band is a frequency band that is preferentially used in communication in the wireless communication network operated by the first telecommunications carrier among the frequency bands assigned to the first telecommunications carrier.

The second communication unit 12 acquires the second information regarding the frequency band preferentially used in communication with the base station (not shown) operated by the second communication carrier. In addition, the second communication unit 12 acquires the signal strength of the radio signal transmitted by each frequency band included in the second information.

The preferentially used frequency band is, among the frequency bands assigned to the second telecommunications carrier, the frequency band preferentially used in communication in the wireless communication network operated by the second telecommunications carrier.

The selection unit 13 selects the first frequency band from the first information acquired by the first communication unit 11, and selects the second frequency band from the second information acquired by the second communication unit 12. The selection unit 13 may select the first frequency band and the second frequency band based on the signal strength of the radio signal transmitted by each frequency band acquired by the first communication unit 11 and the second communication unit 12. .. Alternatively, the selection unit 13 may select the first frequency band and the second frequency band based on the priority of each frequency band acquired by the first communication unit 11 and the second communication unit 12.

The determination unit 14 receives the first signal strength indicating the signal strength of the first frequency band, the second signal strength indicating the signal strength of the second frequency band, and the reception during simultaneous communication by the first frequency band and the second frequency band. It is determined whether or not the desired communication quality is satisfied based on the amount of sensitivity deterioration.

Specifically, the determination unit 14 determines the first signal strength, the second signal strength, the amount of deterioration in the first reception sensitivity of the first communication unit during simultaneous communication by the first frequency band and the second frequency band, and the second. Based on the amount of deterioration in the second reception sensitivity of the communication unit, it is determined whether or not the desired communication quality is satisfied. The determination unit 14 determines that the communication in the first frequency band satisfies the first communication quality based on the first signal strength, the second signal strength, the first reception sensitivity deterioration amount, and the second reception sensitivity deterioration amount. It is determined whether the communication in the second frequency band satisfies the second communication quality.

The first reception sensitivity deterioration amount is the reception sensitivity deterioration amount of the first communication unit, and is the reception sensitivity deterioration amount with respect to the first signal strength. The second reception sensitivity deterioration amount is the reception sensitivity deterioration amount of the second communication unit, and is the reception sensitivity deterioration amount with respect to the second signal strength.

The amount of deterioration in the first reception sensitivity is the amount of interference that the communication of the second communication unit 12 gives to the communication of the first communication unit 11 and the first communication unit due to the input of the radio signal of the second communication unit 12 to cause blocking. Includes 11 signal level degradation amounts. Blocking means that the radio signal of the second communication unit 12 is input to the first communication unit 11, the AMP (Amplifier) is saturated, and the signal level of the first communication unit 11 deteriorates.

The amount of deterioration in the second reception sensitivity is the amount of interference that the communication of the first communication unit 11 gives to the communication of the second communication unit 12 and the second communication unit due to the input of the radio signal of the first communication unit 11 to cause blocking. Includes 12 signal level reductions.

Since the communication terminal 1 according to the first embodiment has the above configuration, the communication by the first frequency band satisfies the first communication quality and the first communication quality is satisfied based on the first reception sensitivity deterioration amount and the second reception sensitivity deterioration amount. It can be determined in advance that the communication by the two frequency bands satisfies the second communication quality. That is, according to the communication terminal 1 according to the first embodiment, the amount of deterioration in reception sensitivity including the amount of interference that the communication of a certain communication carrier gives to the communication of another communication carrier is taken into consideration before the communication is performed. , It becomes possible to determine in advance whether or not the desired communication quality is satisfied. Therefore, according to the communication terminal 1 according to the first embodiment, it is possible to suppress deterioration of communication quality.

(Embodiment 2)
Subsequently, the second embodiment will be described. The second embodiment is an embodiment in which the first embodiment is detailed.

<Configuration example of wireless communication system>
A configuration example of the wireless communication system 100 according to the second embodiment will be described with reference to FIG. FIG. 2 is a diagram showing a configuration example of the wireless communication system according to the second embodiment. As shown in FIG. 2, the wireless communication system 100 includes a communication terminal 20, a base station 30, and a base station 40.

The communication terminal 20 corresponds to the communication terminal 1 according to the first embodiment. The communication terminal 20 is a communication terminal that supports communication in a wireless communication network operated by two communication carriers. The communication terminal 20 is, for example, a communication terminal corresponding to LTE (Long Term Evolution) communication provided by two communication carriers. In the following description, the two carriers will be described as LTE1 and LTE2. In the present embodiment, the communication terminal 20 is described as a communication terminal whose communication method corresponds to LTE, but it may be a communication terminal corresponding to LTE-Advance, or it corresponds to another communication method. You may. Further, the communication terminal 20 may be a communication terminal corresponding to LTE communication provided by three or more communication carriers.

The base station 30 is a base station provided in a wireless communication network operated by a telecommunications carrier LTE1, and is a wireless base station specified in 3GPP. The base station 30 is capable of LTE communication, for example, and may be referred to as an eNodeB or an eNB. The base station 30 notifies the broadcast information including various information necessary for the communication terminal 20 to perform communication. The broadcast information includes information on a frequency band (frequency band) assigned to LTE 1 that the communication terminal 20 preferentially uses in communication with the base station 30.

Although the wireless communication system 100 is described in FIG. 2 as a configuration including one base station 30, it may be configured to include a plurality of base stations 30. That is, the communication terminal 20 may receive broadcast information from a plurality of base stations 30 and acquire information regarding a frequency band that is preferentially used in the wireless communication network operated by LTE1.

The base station 40 is a base station provided in a wireless communication network operated by a telecommunications carrier LTE2, and is a wireless base station specified in 3GPP. The base station 40 is capable of LTE communication, for example, and may be referred to as eNodeB or eNB. The base station 40 notifies the broadcast information including various information necessary for the communication terminal 20 to perform communication. The broadcast information includes information on a frequency band (frequency band) assigned to LTE 2 that the communication terminal 20 preferentially uses in communication with the base station 40.

Although the wireless communication system 100 is described in FIG. 2 as a configuration including one base station 40, it may be configured to include a plurality of base stations 40. That is, the communication terminal 20 may receive broadcast information from a plurality of base stations 40 and acquire information regarding a frequency band that is preferentially used in the wireless communication network operated by LTE2.

<Communication terminal configuration example>
Next, a configuration example of the communication terminal 20 will be described with reference to FIG. FIG. 3 is a diagram showing a configuration example of a communication terminal according to the second embodiment. The communication terminal 20 includes a communication unit 21, a communication unit 22, a control unit 23, and a storage unit 24.

The communication unit 21 corresponds to the first communication unit 11 according to the first embodiment. The communication unit 21 is configured to be able to connect and communicate with the base station 30 operated by the communication carrier LTE1. The communication unit 21 receives the broadcast information notified from the base station 30, and acquires information about the frequency band preferentially used in communication with the base station 30 from the broadcast information. The communication unit 21 measures and acquires RSRP (Reference Signal Received Power) indicating the signal strength of the radio signal transmitted by each frequency band included in the priority band information. In the following description, information regarding the preferentially used frequency band received by the communication unit 21 may be referred to as LTE1 priority band information.

The communication unit 21 includes an antenna unit 211 and a radio unit 212.
The antenna unit 211 is an antenna for transmitting and receiving wireless signals. The antenna unit 211 receives the broadcast information broadcast from the base station 30.

The radio unit 212 modulates the baseband signal and transmits the modulated transmission signal to the base station 30 via the antenna unit 211. Further, the radio unit 212 demodulates the received signal received by the antenna unit 211 into a baseband signal.

The radio unit 212 demodulates the radio signal (received signal) received via the antenna unit 211 into a baseband signal. The radio unit 212 acquires LTE1 priority band information included in the notification information notified from the base station 30 and outputs the LTE1 priority band information to the control unit 23. The radio unit 212 measures the RSRP of the radio signal transmitted by each frequency band included in the broadcast information notified from the base station 30, and outputs the measurement result to the control unit 23.

The communication unit 22 corresponds to the second communication unit 12 according to the first embodiment. The communication unit 22 is configured to be able to connect and communicate with the base station 40 operated by the communication carrier LTE2. The communication unit 22 receives the broadcast information notified from the base station 40, and acquires information about the frequency band preferentially used in communication with the base station 40 from the broadcast information. The communication unit 22 measures and acquires RSRP indicating the signal strength of the radio signal transmitted by each frequency band included in the priority band information. In the following description, information regarding the preferentially used frequency band received by the communication unit 22 may be referred to as LTE2 priority band information.

The communication unit 22 includes an antenna unit 221 and a radio unit 222.
The antenna unit 221 is an antenna for transmitting and receiving radio signals. The antenna unit 221 receives the broadcast information broadcast from the base station 40.

The radio unit 222 modulates the baseband signal and transmits the modulated transmission signal to the base station 40 via the antenna unit 221. Further, the radio unit 222 demodulates the received signal received by the antenna unit 221 into a baseband signal.

The radio unit 222 demodulates the radio signal (received signal) received via the antenna unit 221 into a baseband signal. The radio unit 222 acquires the LTE2 priority band information included in the notification information notified from the base station 40 and outputs the LTE2 priority band information to the control unit 23. The radio unit 222 measures the RSRP of the radio signal transmitted by each frequency band included in the broadcast information broadcast from the base station 40, and outputs the measurement result to the control unit 23.

The control unit 23 is a control unit that performs various controls of the communication terminal 20. The control unit 23 includes a selection unit 231, a determination unit 232, and a communication control unit 233.

The selection unit 231 corresponds to the selection unit 13 according to the first embodiment. The selection unit 231 selects one frequency band from the frequency bands included in the LTE1 priority band information based on the RSRP of each frequency band acquired by the communication unit 21 (radio unit 212).

Specifically, the selection unit 231 selects the frequency band having the highest RSRP from the frequency bands not selected among the frequency bands included in the LTE1 priority band information. In the following description, the frequency band selected from the LTE1 priority band information may be described as the LTE1 frequency band.

Further, the selection unit 231 selects one frequency band from the frequency bands included in the LTE2 priority band information based on the RSRP of each frequency band acquired by the radio unit 222.

Specifically, the selection unit 231 selects the frequency band having the highest RSRP from the frequency bands not selected among the frequency bands included in the LTE2 priority band information. In the following description, the frequency band selected from the LTE2 priority band information may be described as the LTE2 frequency band.

The determination unit 232 corresponds to the determination unit 14 according to the first embodiment. Based on the reception sensitivity deterioration amount information table T1, the determination unit 232 determines the reception sensitivity deterioration amount of each of the communication unit 21 and the communication unit 22 at the time of simultaneous communication by the LTE1 frequency band and the LTE2 frequency band. The reception sensitivity deterioration amount information table T1 is information stored in the storage unit 24 described later, and includes the reception sensitivity deterioration amount for RSRP measured by the communication unit 21 and the reception sensitivity deterioration amount for RSRP measured by the communication unit 22. Information for determining.

Here, with reference to FIGS. 3 to 5, it will be described that the reception sensitivity is deteriorated by the communication unit 21 and the communication unit 22 communicating at the same time, and the reception sensitivity deterioration amount information table T1 will be described. 3 and 4 are diagrams for explaining that the reception sensitivity deteriorates when the two communication units communicate with each other at the same time.

First, FIG. 3 will be described. FIG. 3 is a diagram showing the relationship between the signal level and the noise level of the communication unit 21, and the vertical axis of FIG. 3 shows the level [dBm]. Note that FIG. 3 is omitted from the description because the communication unit 22 has the same characteristics.

The solid line shows the signal level (signal strength) of the received signal of the communication unit 21, and the alternate long and short dash line shows the noise level of the communication unit 21 when the communication unit 22 is not operating (when OFF). .. The difference between the signal level and the noise level is the S / N ratio (SINR: Signal to Interference plus Noise power Ratio).

The dotted line indicates the noise level of the communication unit 21 when the communication unit 22 is operating (when ON), and the noise level of the communication unit 21 increases as compared with the case where the communication unit 22 is not operating. .. That is, when the communication unit 22 operates, the signal of the communication unit 22 interferes with the communication unit 21, and the noise level of the communication unit 21 rises. As the noise level rises, the difference from the signal level becomes smaller, so the S / N ratio decreases. When the communication unit 21 and the communication unit 22 communicate with each other at the same time in this way, the communication in the communication unit 22 interferes with the communication in the communication unit 21, and the reception sensitivity of the communication unit 21 deteriorates.

Next, FIG. 4 will be described. FIG. 4 is a diagram showing the relationship between the signal level and the noise level of the communication unit 21, and the vertical axis of FIG. 4 shows the level [dBm]. Note that FIG. 4 omits the description because the communication unit 22 has the same characteristics.

The solid line indicates the signal level (signal strength) of the received signal of the communication unit 21 when the communication unit 22 is not operating (when OFF), and the dotted line indicates the signal level (signal strength) when the communication unit 22 is operating (when OFF). ) Indicates the signal level (signal strength) of the received signal of the communication unit 21. The alternate long and short dash line indicates the noise level of the communication unit 21. Similar to FIG. 3, the difference between the signal level and the noise level is the signal-to-noise ratio (SINR).

When the communication unit 22 operates (when the communication unit 22 is turned on), the signal level of the communication unit 21 is lowered because blocking occurs due to the radio signal of the communication unit 22. Blocking means that the radio signal of the communication unit 22 is input to the communication unit 21, the AMP is saturated, and the signal level of the communication unit 21 deteriorates.

When the signal level decreases, the difference from the noise level decreases, so that the S / N ratio decreases. When the communication unit 21 and the communication unit 22 communicate at the same time in this way, blocking occurs due to the wireless signal of the communication unit 22, the signal level in the communication unit 21 decreases, and the reception sensitivity of the communication unit 21 deteriorates. ..

Therefore, in the present embodiment, the amount of deterioration of the reception sensitivity including both the values of the reception sensitivity that are deteriorated by the communication unit 21 and the communication unit 22 simultaneously communicating with each other as described with reference to FIGS. 3 and 4 is measured in advance. It is registered in the reception sensitivity deterioration amount information table T1. Then, the determination unit 232 determines the reception sensitivity deterioration amount of each of the communication unit 21 and the communication unit 22 based on the reception sensitivity deterioration amount information table T1.

Next, an example of the reception sensitivity deterioration amount information table T1 will be described with reference to FIG. FIG. 5 is a diagram showing an example of a reception sensitivity deterioration amount information table. The reception sensitivity deterioration amount information table T1 is a table in which the reception sensitivity deterioration amounts of the communication unit 21 and the communication unit 22 when the communication unit 21 and the communication unit 22 communicate with each other at the same time are registered.

The band (LTE1), RSRP (LTE1), band (LTE2), RSRP (LTE2), deterioration amount (LTE1), and deterioration amount (LTE2) are set in the reception sensitivity deterioration amount information table T1 in this order from the left.

In the band (LTE1), a candidate frequency band that can be set in the LTE1 priority band information is set.
In RSRP (LTE1), RSRP, which is a condition for determining the amount of deterioration in reception sensitivity of the communication unit 21 and the communication unit 22, is set for each candidate frequency band that can be set in the LTE1 priority band information. In the present embodiment, the RSRP (LTE1) is set so that the RSRP as a condition includes a predetermined range.

In the band (LTE2), a candidate frequency band that can be set in the LTE2 priority band information is set.
In RSRP (LTE2), RSRP, which is a condition for determining the amount of deterioration in reception sensitivity of the communication unit 21 and the communication unit 22, is set for each candidate frequency band that can be set in the LTE2 priority band information. In the present embodiment, the RSRP (LTE2) is set so that the RSRP as a condition includes a predetermined range.

In the deterioration amount (LTE1), the reception sensitivity deterioration amount of the communication unit 21 when simultaneous communication is performed by the communication unit 21 and the communication unit 22 is set. In other words, the deterioration amount (LTE1) is set to the reception sensitivity deterioration amount of the communication unit 21 when simultaneous communication is performed by the LTE1 frequency band and the LTE2 frequency band. The amount of deterioration in reception sensitivity of the communication unit 21 is determined by a combination of the LTE1 frequency band, RSRP of the frequency band, LTE2 frequency band, and RSRP of the frequency band.

In the deterioration amount (LTE2), the reception sensitivity deterioration amount of the communication unit 22 when simultaneous communication is performed by the communication unit 21 and the communication unit 22 is set. In other words, the deterioration amount (LTE2) is set to the reception sensitivity deterioration amount of the communication unit 22 when simultaneous communication is performed by the LTE1 frequency band and the LTE2 frequency band. The amount of deterioration in reception sensitivity of the communication unit 22 is determined by a combination of the LTE1 frequency band, RSRP of the frequency band, LTE2 frequency band, and RSRP of the frequency band.

For example, suppose that the selection unit 231 selects frequency band A as the LTE1 frequency band, and the RSRP of frequency band A is X [dBm] between Δ△ and □□. Further, it is assumed that the selection unit 231 selects the frequency band b as the LTE2 frequency band, and the RSRP of the frequency band b is Y [dBm] between ▲▲ and ■■. In this case, the determination unit 232 determines the amount of deterioration in reception sensitivity of the communication unit 21 as BF [dB], and the amount of deterioration in reception sensitivity of the communication unit 22 as bf [dB].

Returning to FIG. 2, the description of the configuration example of the determination unit 232 will be continued. When the determination unit 232 determines the amount of deterioration in reception sensitivity of the communication unit 21, the determination unit 232 corrects the RSRP of the LTE1 frequency band selected from the LTE1 priority band information by the selection unit 231 based on the amount of deterioration in reception sensitivity of the determined communication unit 21. .. Further, when the determination unit 232 determines the reception sensitivity deterioration amount of the communication unit 22, the RSRP of the LTE2 frequency band selected by the selection unit 231 from the LTE2 priority band information is determined based on the reception sensitivity deterioration amount of the communication unit 22. to correct.

Assuming that the corrected RSRP for the frequency band A selected as the LTE1 frequency band is "LTE1BandA reception quality (RSRP)", the determination unit 232 corrects the RSRP of the frequency band A using the following equation (1). ..
LTE1BandA reception quality (RSRP) = X-BF ... (1)

Assuming that the corrected RSRP for the frequency band b selected as the LTE2 frequency band is "LTE2Bandb reception quality (RSRP)", the determination unit 232 corrects the RSRP of the frequency band b using the following equation (2). ..
LTE2Bandb reception quality (RSRP) = Y-bf ... (2)

Then, the determination unit 232 satisfies the communication quality (communication quality for LTE1) in which the communication by the LTE1 frequency band is registered in advance, and the communication quality in which the communication by the LTE2 frequency band is registered in advance (communication quality for LTE2). Is determined.

Specifically, the determination unit 232 uses the RSRP threshold information table T2, and the corrected RSRP calculated by the equation (1) is equal to or greater than the pre-registered threshold value, and is calculated by the equation (2). It is determined whether the corrected RSRP is equal to or higher than the pre-registered threshold value.

When the corrected RSRP calculated by the equation (1) is equal to or higher than the pre-registered threshold value (RSRP threshold value for LTE1), the determination unit 232 determines the communication quality (communication for LTE1) in which communication by the LTE1 frequency band is registered in advance. Quality) is judged to be satisfied.

When the corrected RSRP calculated by the equation (2) is equal to or higher than the pre-registered threshold value (RSRP threshold value for LTE2), the determination unit 232 determines the communication quality (communication for LTE2) in which communication by the LTE2 frequency band is registered in advance. Quality) is judged to be satisfied.

Here, an example of the RSRP threshold information table T2 will be described with reference to FIG. FIG. 6 is a diagram showing an example of the RSRP threshold information table. The RSRP threshold information table T2 is a table in which an RSRP threshold is set for determining whether or not communication in the frequency band selected by the selection unit 231 is stable communication. The RSRP threshold information table T2 contains an RSRP threshold (RSRP threshold for LTE1) for determining whether or not the communication quality for LTE1 is satisfied, and an RSRP threshold (RSRP for LTE2) for determining whether or not the communication quality for LTE2 is satisfied. It is a table in which the threshold value) is set.

In the RSRP threshold information table T2, a telecommunications carrier, a band, and an RSRP threshold are set in order from the left.
As the telecommunications carrier, a telecommunications carrier for obtaining the RSRP threshold value is set, and LTE1 or LTE2 is set. When LTE1 is set, it indicates that the RSRP threshold of the row in the RSRP threshold information table is the RSRP threshold for LTE1. When LTE2 is set, it indicates that the RSRP threshold of the row in the RSRP threshold information table is the RSRP threshold for LTE2.

For the band, each frequency band that can be set in the LTE1 priority band information and the LTE2 priority band information is set. For example, in the RSRP threshold information table T2, the RSRP threshold of the row in which LTE1 is set for the telecommunications carrier and A is set for the band is the RSRP threshold for LTE1, and the RSRP threshold for frequency band A is set. Is shown.

The RSRP threshold is set to the RSRP threshold for determining whether or not the communication is stable. When the telecommunications carrier is LTE1, it is the RSRP threshold for LTE1, and when the telecommunications carrier is LTE2, it is the RSRP threshold for LTE2. The RSRP threshold is a threshold determined by the combination of the telecommunications carrier and the frequency band.

The determination unit 232 determines whether or not the corrected RSRP calculated by the equations (1) and (2) is equal to or greater than the threshold set in the RSRP threshold information table T2.

For example, suppose that the selection unit 231 selects frequency band A as the LTE1 frequency band and selects frequency band b as the LTE2 frequency band. It is assumed that the LTE1BandA reception quality (RSRP) is X-BF and the LTE2Bandb reception quality (RSRP) is Y-bf.

The determination unit 232 acquires the RSRP threshold value of the row in which the telecommunications carrier is set to LTE1 and the band is set to A from the RSRP threshold value information table T2. The determination unit 232 determines whether or not the X-BF has acquired RSRP (-127 dBm) or more.

The determination unit 232 acquires the RSRP threshold value of the row in which the telecommunications carrier is set to LTE2 and the band is set to b from the RSRP threshold value information table T2. The determination unit 232 determines whether or not Y-bf is equal to or greater than the acquired RSRP (-124 dBm).

When the X-BF is -127 dBm or more, the determination unit 232 determines that the communication by the LTE1 frequency band satisfies the communication quality registered in advance (communication quality for LTE1). When Y-bf is −124 dBm or more, the determination unit 232 determines that the communication by the LTE2 frequency band satisfies the communication quality registered in advance (communication quality for LTE2).

On the other hand, when X-BF is less than -127 dBm, the determination unit 232 determines that the communication by the LTE1 frequency band does not satisfy the communication quality registered in advance (communication quality for LTE1). When Y-bf is less than −124 dBm, the determination unit 232 determines that the communication by the LTE2 frequency band does not satisfy the communication quality registered in advance (communication quality for LTE2).

When the determination unit 232 determines that the communication by the LTE1 frequency band does not satisfy the communication quality for LTE1, the selection unit 231 causes the selection unit 231 to select a frequency band different from the already selected frequency band. That is, when the communication by the LTE1 frequency band does not satisfy the communication quality for LTE1, the selection unit 231 selects a frequency band different from the already selected frequency band as the LTE1 frequency band from the LTE1 priority band information.

When the determination unit 232 determines that the communication by the LTE2 frequency band does not satisfy the communication quality for LTE2, the determination unit 232 causes the selection unit 231 to select a frequency band different from the already selected frequency band. That is, when the communication by the LTE2 frequency band does not satisfy the communication quality for LTE2, the selection unit 231 selects a frequency band different from the already selected frequency band as the LTE2 frequency band from the LTE2 priority band information.

The selection unit 231 selects a frequency band until the communication by the frequency band selected from the LTE1 priority band information satisfies the communication quality for LTE1 and the communication by the frequency band selected from the LTE2 priority band information satisfies the communication quality for LTE2. repeat.

When the communication by the LTE1 frequency band satisfies the communication quality for LTE1 and the communication by the LTE2 frequency band satisfies the communication quality for LTE2, the communication control unit 233 sets the LTE1 frequency band in the communication unit 21 and sets the LTE2 frequency band. Set in the communication unit 22. That is, when the communication by the LTE1 frequency band satisfies the communication quality for LTE1 and the communication by the LTE2 frequency band satisfies the communication quality for LTE2, the communication control unit 233 performs the communication by the LTE1 frequency band and the LTE2 frequency band. Control.

The storage unit 24 stores the reception sensitivity deterioration amount information table T1 and the RSRP threshold value information table T2. In addition, the storage unit 24 stores various setting information necessary for the communication terminal 20 to operate.

<Operation example of communication terminal>
Next, an operation example of the communication terminal 20 will be described with reference to FIG. 7. FIG. 7 is a flowchart showing an operation example of the communication terminal according to the second embodiment.

When the communication terminal 20 is activated or cell reselection (cell reselection) is executed (step S101), the communication terminal 20 executes the operations after step S102. Cell selection is an operation for selecting a different cell from the currently connected cells.

Next, the communication unit 21 receives the notification information from the base station 30 operated by the communication company 1, and the communication unit 22 receives the notification information from the base station 40 operated by the communication company 2 (step S102).

The communication unit 21 (radio unit 212) acquires the LTE1 priority band information included in the broadcast information received from the base station 30, and measures the RSRP of the radio signal transmitted by each frequency band included in the LTE1 priority band information. To get. The radio unit 212 outputs the acquired LTE1 priority band information and RSRP of each frequency band included in the LTE1 priority band information to the control unit 23.

The communication unit 22 (radio unit 222) acquires the LTE2 priority band information included in the broadcast information received from the base station 40, and measures the RSRP of the radio signal transmitted by each frequency band included in the LTE2 priority band information. To get. The radio unit 222 outputs the acquired LTE1 priority band information and RSRP of each frequency band included in the LTE1 priority band information to the control unit 23.

Next, the selection unit 231 selects one frequency band from each of the LTE1 priority band information and the LTE2 priority band information based on the RSRP of each frequency band (step S103).

Specifically, the selection unit 231 selects the frequency band having the largest RSRP value among the frequency bands included in the LTE1 priority band information as the LTE1 frequency band. The selection unit 231 selects the frequency band having the largest RSRP value among the frequency bands included in the LTE2 priority band information as the LTE2 frequency band.

It is also assumed that each of the LTE1 priority band information and the LTE2 priority band information contains only one frequency band. Therefore, the selection unit 231 confirms whether or not a plurality of frequency bands are included for each of the LTE1 priority band information and the LTE2 priority band information, and when the plurality of frequency bands are included, the selection unit 231 selects the frequency band based on RSRP. You may try to do so.

Next, the determination unit 232 acquires (determines) the amount of deterioration in reception sensitivity of the communication unit 21 and the communication unit 22 when simultaneous communication is performed with a frequency band selected from each of the LTE1 priority band information and the LTE2 priority band information. (Step S104).

Specifically, the determination unit 232 uses the reception sensitivity deterioration amount information table T1 and the selected LTE1 frequency band, LTE2 frequency band, and RSRP of the frequency band to deteriorate the reception sensitivity of the communication unit 21 and the communication unit 22. Determine the amount.

Next, the determination unit 232 corrects the RSRP of the selected frequency band based on the amount of deterioration in reception sensitivity of the communication unit 21 and the communication unit 22 acquired in step S104 (step S105).

Specifically, the determination unit 232 corrects the RSRP of the LTE1 frequency band by using the RSRP of the LTE1 frequency band, the amount of deterioration of the reception sensitivity of the acquired communication unit 21, and the equation (1). The determination unit 232 corrects the RSRP of the LTE2 frequency band by using the RSRP of the LTE2 frequency band, the amount of deterioration of the reception sensitivity of the acquired communication unit 22, and the equation (2).

Next, the determination unit 232 determines whether the RSRP corrected in step S105 is equal to or greater than the pre-registered RSRP threshold value (step S106). Specifically, the determination unit 232 has the corrected RSPR for the LTE1 frequency band, the carrier of the RSRP threshold information table T2 is LTE1, and the RSRP threshold (RSRP for LTE1) corresponding to the selected frequency band. Determine if it is greater than or equal to the threshold). Further, in the determination unit 232, the corrected RSPR for the LTE2 frequency band is equal to or higher than the RSRP threshold (RSRP threshold for LTE2) corresponding to the selected frequency band when the carrier of the RSRP threshold information table T2 is LTE2. Is determined.

When the corrected RSRP of the LTE1 frequency band is equal to or higher than the RSRP threshold value (RSRP threshold value for LTE1) and the corrected RSRP of the LTE2 frequency band is equal to or higher than the RSRP threshold value (RSRP threshold value for LTE2) (YES in step S106), the process proceeds to step S108.

On the other hand, when at least one of the corrected RSRP of the LTE1 frequency band and the corrected RSRP of the LTE2 frequency band is less than the RSRP threshold value (NO in step S106), the process proceeds to step S107.

In step S107, for the frequency band in which the corrected RSRP is less than the RSRP threshold value, the selection unit 231 changes the frequency band (step S107), returns to step S104, and continues the process.

When the corrected RSRP of the LTE1 frequency band is less than the RSRP threshold value (RSRP threshold value for LTE1), the selection unit 231 has the highest RSPR frequency among the frequency bands excluding the frequency band already selected in the LTE1 priority band information. Select a band. In other words, the selection unit 231 selects a frequency band different from the already selected frequency band as the LTE1 frequency band from the LTE1 priority band information.

When the corrected RSRP of the LTE2 frequency band is less than the RSRP threshold value (RSRP threshold value for LTE2), the selection unit 231 has the highest RSPR frequency among the frequency bands excluding the frequency band already selected in the LTE2 priority band information. Select a band. In other words, the selection unit 231 selects a frequency band different from the already selected frequency band as the LTE2 frequency band from the LTE2 priority band information.

When the determination unit 232 determines that stable communication cannot be performed when simultaneous communication is performed by the LTE1 frequency band and the LTE2 frequency band, the selection unit 231 selects the next priority frequency band. Then, the selection unit 231 and the determination unit 232 perform steps S104 to S107 until a combination of frequency bands determined to enable stable communication even if simultaneous communication is performed by the LTE1 frequency band and the LTE2 frequency band is found. repeat.

In step S108, the communication control unit 233 sets the currently selected frequency band to the communication unit 21 and the communication unit 22, performs registration (location registration, etc.), puts it in the standby state (step S108), and performs processing. finish. That is, when the communication control unit 233 finds a combination of frequency bands that is determined to enable stable communication even if simultaneous communication is performed by the LTE1 frequency band and the LTE2 frequency band, the communication control unit 233 currently selects the frequency band. Communicate with. The communication terminal 20 starts simultaneous communication by the LTE1 frequency band and the LTE2 frequency band, and realizes stable communication.

As described above, the communication unit 21 acquires the LTE1 priority band information and the RSRP of each frequency band included in the LTE1 priority band information. The communication unit 22 acquires the LTE2 priority band information and the RSRP of each frequency band included in the LTE2 priority band information. The selection unit 231 selects a frequency band from each of the LTE1 priority band information and the LTE2 priority band information. The determination unit 232 determines the amount of deterioration in reception sensitivity of the communication unit 21 and the communication unit 22 when simultaneous communication is performed with the selected frequency band, and corrects the RSRP of the selected frequency band. Then, the determination unit 232 determines in advance whether or not the communication by the selected frequency band satisfies the communication quality registered in advance by comparing the corrected RSRP and the RSRP threshold value. That is, according to the communication terminal 20, the desired communication quality is obtained in consideration of the amount of deterioration in reception sensitivity including the amount of interference that the communication of one communication carrier gives to the communication of another communication carrier before performing communication. It is possible to determine in advance whether or not the condition is satisfied. Therefore, according to the communication terminal 20 according to the second embodiment, it is possible to suppress deterioration of communication quality.

Further, when the communication by the selected frequency band does not satisfy the desired communication quality, the selection unit 231 and the determination unit 232 select a combination of different frequency bands until the desired communication quality is satisfied. That is, the communication terminal 20 does not perform communication until both the LTE1 frequency band and the LTE2 frequency band satisfy the desired communication quality. Therefore, according to the communication terminal 20, it is not possible to establish the communication of any of the communication carriers, and it is possible to operate so as to suppress the request for reconnection from the wireless communication network of the communication carrier. Therefore, according to the communication terminal 20 according to the second embodiment, it is possible to shorten the time until the communication establishment is completed.

(Modification example)
In the second embodiment described above, the following modifications may be made.
<1> In the second embodiment, the selection unit 231 selects the LTE1 frequency band from the LTE1 priority band information and selects the LTE2 frequency band from the LTE2 priority band information based on the RSRP of each frequency band. .. However, the present invention is not limited to this, and the selection unit 231 selects the LTE1 frequency band from the LTE1 priority band information and selects the LTE2 frequency band from the LTE2 priority band information based on the priority set for each frequency band. May be.

In this case, the storage unit 24 may store in advance the priority of each frequency band that can be set in the LTE1 priority band information, and may store in advance the priority of each frequency band that can be set in the LTE2 priority band information. Then, the selection unit 231 selects the LTE1 frequency band from the LTE1 priority band information and selects the LTE2 frequency band from the LTE2 priority band information based on the priority of each frequency band stored in the storage unit 24. May be good.

Alternatively, the base station 30 may include the priority of each frequency band in the LTE1 priority band information, and the base station 40 may include the priority of each frequency band in the LTE2 priority band information. Then, the selection unit 231 may select the LTE1 frequency band from the LTE1 priority band information based on the priority of each frequency band included in the LTE1 priority band information. Further, the selection unit 231 may select an LTE2 frequency band from the LTE2 priority band information based on the priority of each frequency band included in the LTE2 priority band information.

<2> In the second embodiment, the storage unit 24 stores the reception sensitivity deterioration amount information table T1, and the determination unit 232 uses the reception sensitivity deterioration amount information table T1 to receive the reception sensitivities of the communication unit 21 and the communication unit 22. The amount of deterioration was determined. However, the present invention is not limited to this, and the reception sensitivity deterioration amount set in the reception sensitivity deterioration amount information table T1 may be reflected in the RSRP threshold value in advance. Even in this way, the same effect as that of the second embodiment can be obtained.

In this case, the storage unit 24 does not have to store the reception sensitivity deterioration amount information table T1. The determination unit 232 can omit the calculation of the above-mentioned equations (1) and (2). Further, the RSRP threshold value set in the RSRP threshold value information table is a value obtained by adding the reception sensitivity deterioration amount set in the reception sensitivity deterioration amount information table T1 to each RSRP threshold value used in the second embodiment.

Here, an example of the RSRP threshold information table T3 according to this modification will be described with reference to FIG. FIG. 8 is a diagram showing an example of the RSRP threshold information table according to the modified example of the second embodiment.

As shown in FIG. 8, in the RSRP threshold information table T3 according to this modified example, a telecommunications carrier, a band, a simultaneous communication status, and an RSRP threshold are set in order from the left.

As the telecommunications carrier, a telecommunications carrier for obtaining the RSRP threshold value is set, and LTE1 or LTE2 is set. When LTE1 is set, it indicates that the RSRP threshold of the row in the RSRP threshold information table is the RSRP threshold for LTE1. When LTE2 is set, it indicates that the RSRP threshold of the row in the RSRP threshold information table is the RSRP threshold for LTE2.

For the band, each frequency band that can be set in the LTE1 priority band information and the LTE2 priority band information is set. For example, in the RSRP threshold information table T3, the RSRP threshold of the row in which LTE1 is set for the telecommunications carrier and A is set for the band is the RSRP threshold for LTE1, and the RSRP threshold for frequency band A is set. Is shown.

Simultaneous communication conditions for determining the RSRP threshold are set in the simultaneous communication conditions. For example, when it is desired to determine the RSRP threshold value for LTE1 in which the LTE1 frequency band is A and the LTE2 frequency band is b, the RSRP threshold value of the line in which LTE1 is set in the telecommunications carrier and LTE2 band b is set in the simultaneous communication condition is for LTE1. Indicates that it is the RSRP threshold.

The RSRP threshold is set to the RSRP threshold for determining whether or not the communication is stable. As described above, the RSRP threshold value of the RSRP threshold value information table T3 is a value that reflects the reception sensitivity deterioration amount set in the reception sensitivity deterioration amount information table T1.

<3> In the second embodiment described above, the reception sensitivity deterioration amount of the communication unit 21 and the communication unit 22 is determined by combining each RSRP in addition to the LTE1 frequency band and the LTE2 frequency band. It was set in the quantity information table T1. However, the present invention is not limited to this, and the amount of deterioration in reception sensitivity of the communication unit 21 and the communication unit 22 may be determined without using RSRP. That is, the reception sensitivity deterioration amount of the communication unit 21 and the communication unit 22 may be set to a value determined by the combination of the LTE1 frequency band and the LTE2 frequency band in the reception sensitivity deterioration amount information table. Even in this way, the same effect as that of the second embodiment can be obtained. Further, in this way, it is possible to reduce the capacity of the storage area required by the storage unit 24.

Here, an example of the reception sensitivity deterioration amount information table T4 according to this modification will be described with reference to FIG. 9. FIG. 9 is a diagram showing an example of a reception sensitivity deterioration amount information table according to a modified example of the second embodiment.

As shown in FIG. 9, the reception sensitivity deterioration amount information table T4 according to the present modification is a table without columns of RSRP (LTE1) and RSRP (LTE2) of the reception sensitivity deterioration amount information table T1 according to the second embodiment. is there. In the reception sensitivity deterioration amount information table T4 according to this modification, the values set in the deterioration amount (LTE1) and the deterioration amount (LTE2) are the deterioration amount (LTE1) and the deterioration amount (LTE2) of the reception sensitivity deterioration amount information table T1. Different from. Since the information set in the reception sensitivity deterioration amount information table T4 is the same as that of the reception sensitivity deterioration amount information table T1, the description thereof is omitted.

<4> In the above-described second embodiment, a modified example in which the above-mentioned modified examples 2 and 3 are combined may be used. That is, as in the modification 3, the amount of deterioration in reception sensitivity of the communication unit 21 and the communication unit 22 is determined by the combination of the LTE1 frequency band and the LTE2 frequency band. Then, the storage unit 24 does not hold the reception sensitivity deterioration amount information table, and the reception sensitivity deterioration amount of the communication unit 21 and the communication unit 22 to be determined becomes a value reflected in the RSRP threshold value of the RSRP threshold value information table T3. .. Even in this way, the same effect as that of the second embodiment can be obtained. Further, in this way, it is possible to reduce the capacity of the storage area required by the storage unit 24.

(Other embodiments)
The communication terminals 1 and 20 (hereinafter, referred to as communication terminals 1 and the like) described in the above-described embodiment may have the following hardware configurations. FIG. 10 is a block diagram illustrating a hardware configuration of a computer (information processing device) capable of realizing a communication terminal or the like according to each embodiment of the present disclosure.

Referring to FIG. 10, the communication terminal 1 and the like include a plurality of antennas 1201-1 to 1201-N, a network interface 1202, a processor 1203 and a memory 1204. The plurality of antennas 1201-1 to 1201-N and the network interface 1202 are used to communicate with other wireless communication devices. The network interface 1202 may include, for example, an IEEE (Institute of Electrical and Electronics Engineers) 802.11 series, an IEEE 802.3 series, and the like, and a network interface card (NIC) compliant with the above-mentioned wireless communication method.

The processor 1203 reads the software (computer program) from the memory 1204 and executes it to perform the processing of the communication terminal 1 and the like described by using the flowchart in the above-described embodiment. The processor 1203 may be, for example, a microprocessor, an MPU (Micro Processing Unit), or a CPU (Central Processing Unit). Processor 1203 may include a plurality of processors.

Memory 1204 is composed of a combination of volatile memory and non-volatile memory. Memory 1204 may include storage located away from processor 1203. In this case, processor 1203 may access memory 1204 via an I / O interface (not shown).

In the example of FIG. 10, memory 1204 is used to store software modules. By reading these software modules from the memory 1204 and executing them, the processor 1203 can perform the processing of the communication terminal 1 and the like described in the above-described embodiment.

As described with reference to FIG. 10, each of the processors included in the communication terminal 1 and the like executes one or a plurality of programs including a group of instructions for causing the computer to perform the algorithm described with reference to the drawings.

In the above example, the program can be stored and supplied to a computer using various types of non-transitory computer readable medium. Non-transitory computer-readable media include various types of tangible storage media. Examples of non-temporary computer-readable media include magnetic recording media (eg, flexible disks, magnetic tapes, hard disk drives), magneto-optical recording media (eg, magneto-optical disks). Further, examples of non-transitory computer-readable media include CD-ROM (Read Only Memory), CD-R, and CD-R / W. Further, examples of non-transitory computer-readable media include semiconductor memory. The semiconductor memory includes, for example, a mask ROM, a PROM (Programmable ROM), an EPROM (Erasable PROM), a flash ROM, and a RAM (Random Access Memory). The program may also be supplied to the computer by various types of transient computer readable medium. Examples of temporary computer-readable media include electrical, optical, and electromagnetic waves. The temporary computer-readable medium can supply the program to the computer via a wired communication path such as an electric wire and an optical fiber, or a wireless communication path.

The present disclosure is not limited to the above embodiment, and can be appropriately modified without departing from the spirit. Further, the present disclosure may be carried out by appropriately combining the respective embodiments.

In addition, some or all of the above embodiments may be described as in the following appendix, but are not limited to the following.
(Appendix 1)
Acquires the first information about the frequency band preferentially used in the communication with the base station operated by the first communication carrier, and the signal strength of the radio signal transmitted by each frequency band included in the first information. With the first communication department
Acquires the second information about the frequency band preferentially used in the communication with the base station operated by the second communication carrier and the signal strength of the radio signal transmitted by each frequency band included in the second information. With the second communication department
A selection unit that selects the first frequency band from the first information and selects the second frequency band from the second information.
When the first signal strength indicating the signal strength of the first frequency band, the second signal strength indicating the signal strength of the second frequency band, and the simultaneous communication by the first frequency band and the second frequency band are performed. Based on the amount of deterioration of the first reception sensitivity of the first communication unit and the amount of deterioration of the second reception sensitivity of the second communication unit, the communication by the first frequency band satisfies the first communication quality and the second. A communication terminal including a determination unit for determining whether communication by a frequency band satisfies the second communication quality.
(Appendix 2)
When the communication by the first frequency band does not satisfy the first communication quality, the selection unit selects a frequency band different from the selected frequency band as the first frequency band, and communicates by the second frequency band. The communication terminal according to Appendix 1, wherein a frequency band different from the selected frequency band is selected as the second frequency band when the second communication quality is not satisfied.
(Appendix 3)
The determination unit corrects the first signal strength based on the first reception sensitivity deterioration amount, and when the corrected first signal strength is equal to or higher than the first threshold value, communication in the first frequency band is performed. When it is determined that one communication quality is satisfied, the second signal strength is corrected based on the second reception sensitivity deterioration amount, and the corrected second signal strength is equal to or higher than the second threshold value, the second frequency band is used. The communication terminal according to Appendix 1 or 2, wherein it is determined that the communication by the above satisfies the second communication quality.
(Appendix 4)
When the first signal strength is equal to or higher than the first threshold value set according to the first reception sensitivity deterioration amount, the determination unit determines that the communication by the first frequency band satisfies the first communication quality. When the second signal strength is equal to or higher than the second threshold value set according to the amount of deterioration of the second reception sensitivity, it is determined that the communication by the second frequency band satisfies the second communication quality, Appendix 1 or The communication terminal according to 2.
(Appendix 5)
The communication terminal according to Appendix 3 or 4, wherein the first reception sensitivity deterioration amount and the second reception sensitivity deterioration amount are determined by a combination of the first frequency band and the second frequency band.
(Appendix 6)
The first reception sensitivity deterioration amount and the second reception sensitivity deterioration amount are determined by a combination of the first frequency band, the first signal strength, the second frequency band, and the second signal strength. The communication terminal according to any one of 5.
(Appendix 7)
The first communication unit acquires the first information from the notification information notified from the base station operated by the first communication carrier, and obtains the first information.
The communication terminal according to any one of Supplementary note 1 to 6, wherein the second communication unit acquires the second information from the notification information notified from the base station operated by the second communication carrier.
(Appendix 8)
The selection unit selects the first frequency band based on the signal strength of the frequency band included in the first information, and the first is based on the signal strength of the frequency band included in the second information. The communication terminal according to any one of Supplementary note 1 to 7, which selects two frequency bands.
(Appendix 9)
The selection unit selects the first frequency band based on the priority of the frequency band included in the first information, and the second frequency is based on the priority of the frequency band included in the second information. The communication terminal according to any one of Supplementary notes 1 to 7, which selects a band.
(Appendix 10)
Acquires the first information about the frequency band preferentially used in the communication with the base station operated by the first communication carrier, and the signal strength of the radio signal transmitted by each frequency band included in the first information. That and
Acquires the second information about the frequency band preferentially used in the communication with the base station operated by the second communication carrier and the signal strength of the radio signal transmitted by each frequency band included in the second information. That and
Selecting the first frequency band from the first information and selecting the second frequency band from the second information
At the time of simultaneous communication between the first signal strength indicating the signal strength of the first frequency band, the second signal strength indicating the signal strength of the second frequency band, and the first frequency band and the second frequency band. Based on the amount of deterioration of the first reception sensitivity with respect to the first signal strength and the amount of deterioration of the second reception sensitivity with respect to the second signal strength, the communication by the first frequency band satisfies the first communication quality and the second. A wireless communication control method including determining whether communication by a frequency band satisfies the second communication quality.
(Appendix 11)
Acquires the first information about the frequency band preferentially used in the communication with the base station operated by the first communication carrier, and the signal strength of the radio signal transmitted by each frequency band included in the first information. That and
Acquires the second information about the frequency band preferentially used in the communication with the base station operated by the second communication carrier and the signal strength of the radio signal transmitted by each frequency band included in the second information. That and
Selecting the first frequency band from the first information and selecting the second frequency band from the second information
At the time of simultaneous communication between the first signal strength indicating the signal strength of the first frequency band, the second signal strength indicating the signal strength of the second frequency band, and the first frequency band and the second frequency band. Based on the amount of deterioration of the first reception sensitivity with respect to the first signal strength and the amount of deterioration of the second reception sensitivity with respect to the second signal strength, the communication by the first frequency band satisfies the first communication quality and the second. A wireless communication control program that causes a computer to determine whether communication by a frequency band satisfies the second communication quality.

1, 20 Communication terminal 11 1st communication unit 12 2nd communication unit 13, 231 Selection unit 14, 232 Judgment unit 21, 22 Communication unit 23 Control unit 24 Storage unit 30, 40 Base station 100 Wireless communication system 211, 221 Antenna unit 212, 222 Wireless unit 233 Communication control unit

Claims (8)

Acquires the first information about the frequency band preferentially used in the communication with the base station operated by the first communication carrier, and the signal strength of the radio signal transmitted by each frequency band included in the first information. With the first communication department
Acquires the second information about the frequency band preferentially used in the communication with the base station operated by the second communication carrier and the signal strength of the radio signal transmitted by each frequency band included in the second information. With the second communication department
A selection unit that selects the first frequency band from the first information and selects the second frequency band from the second information.
When the first signal strength indicating the signal strength of the first frequency band, the second signal strength indicating the signal strength of the second frequency band, and the simultaneous communication by the first frequency band and the second frequency band are performed. Based on the amount of deterioration of the first reception sensitivity of the first communication unit and the amount of deterioration of the second reception sensitivity of the second communication unit, the communication by the first frequency band satisfies the first communication quality and the second. A determination unit for determining whether communication by a frequency band satisfies the second communication quality is provided .
The communication terminal , wherein the first reception sensitivity deterioration amount and the second reception sensitivity deterioration amount are determined by a combination of the first frequency band, the first signal strength, the second frequency band, and the second signal strength. When the communication by the first frequency band does not satisfy the first communication quality, the selection unit selects a frequency band different from the selected frequency band as the first frequency band, and communicates by the second frequency band. The communication terminal according to claim 1, wherein when the second communication quality is not satisfied, a frequency band different from the selected frequency band is selected as the second frequency band. The determination unit corrects the first signal strength based on the first reception sensitivity deterioration amount, and when the corrected first signal strength is equal to or higher than the first threshold value, communication in the first frequency band is performed. When it is determined that one communication quality is satisfied, the second signal strength is corrected based on the second reception sensitivity deterioration amount, and the corrected second signal strength is equal to or higher than the second threshold value, the second frequency band is used. The communication terminal according to claim 1 or 2, wherein it is determined that the communication by the user satisfies the second communication quality. When the first signal strength is equal to or higher than the first threshold value set according to the first reception sensitivity deterioration amount, the determination unit determines that the communication by the first frequency band satisfies the first communication quality. 1. When the second signal strength is equal to or higher than the second threshold value set according to the amount of deterioration in the second reception sensitivity, it is determined that the communication in the second frequency band satisfies the second communication quality. Or the communication terminal according to 2. The first communication unit acquires the first information from the notification information notified from the base station operated by the first communication carrier, and obtains the first information.
The communication terminal according to any one of claims 1 to 4 , wherein the second communication unit acquires the second information from the notification information notified from the base station operated by the second communication carrier. The selection unit selects the first frequency band based on the signal strength of the frequency band included in the first information, and the first is based on the signal strength of the frequency band included in the second information. The communication terminal according to any one of claims 1 to 5 , which selects two frequency bands. Acquires the first information about the frequency band preferentially used in the communication with the base station operated by the first communication carrier, and the signal strength of the radio signal transmitted by each frequency band included in the first information. That and
Acquires the second information about the frequency band preferentially used in the communication with the base station operated by the second communication carrier and the signal strength of the radio signal transmitted by each frequency band included in the second information. That and
Selecting the first frequency band from the first information and selecting the second frequency band from the second information
At the time of simultaneous communication between the first signal strength indicating the signal strength of the first frequency band, the second signal strength indicating the signal strength of the second frequency band, and the first frequency band and the second frequency band. Based on the amount of deterioration of the first reception sensitivity with respect to the first signal strength and the amount of deterioration of the second reception sensitivity with respect to the second signal strength, the communication by the first frequency band satisfies the first communication quality and the second. and the communication by the frequency band to determine satisfies the second communication quality, only including,
The first reception sensitivity deterioration amount and the second reception sensitivity deterioration amount are determined by a combination of the first frequency band, the first signal strength, the second frequency band, and the second signal strength. Method. A wireless communication control program for causing a computer to execute a wireless communication control method.
The wireless communication control method is
Acquires the first information about the frequency band preferentially used in the communication with the base station operated by the first communication carrier, and the signal strength of the radio signal transmitted by each frequency band included in the first information. That and
Acquires the second information about the frequency band preferentially used in the communication with the base station operated by the second communication carrier and the signal strength of the radio signal transmitted by each frequency band included in the second information. That and
Selecting the first frequency band from the first information and selecting the second frequency band from the second information
At the time of simultaneous communication between the first signal strength indicating the signal strength of the first frequency band, the second signal strength indicating the signal strength of the second frequency band, and the first frequency band and the second frequency band. Based on the amount of deterioration of the first reception sensitivity with respect to the first signal strength and the amount of deterioration of the second reception sensitivity with respect to the second signal strength, the communication by the first frequency band satisfies the first communication quality and the second. Including determining whether communication by frequency band satisfies the second communication quality,
The first reception sensitivity deterioration amount and the second reception sensitivity deterioration amount are determined by a combination of the first frequency band, the first signal strength, the second frequency band, and the second signal strength. program.

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