JP2013201501A - Radio base station device, radio terminal device, and communication control method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a radio base station device, a radio terminal device, and a communication control method which can suppress battery consumption of the radio terminal device without imposing a large load on a host network.SOLUTION: The radio base station device comprises: a radio reception unit 93 and a radio transmission unit 94 for receiving/transmitting radio signals from/to a radio terminal device 202; and a battery information acquisition unit 11 for acquiring battery information concerning a state of a battery of the radio terminal device 202.

Description

  The present invention relates to a radio base station apparatus, a radio terminal apparatus, and a communication control method, and more particularly to a radio base station apparatus, a radio terminal apparatus, and a communication control method that can suppress battery consumption of the radio terminal apparatus.

  In recent years, a cell for increasing the wireless communication capacity in a desired communication area, that is, an area in which a wireless terminal device can communicate, due to a dramatic increase in the number of mobile communication service subscribers and an increase in communication traffic due to data communication In addition to a coverage base station that forms a base station, for example, a communication system is proposed in which a capacity booster base station that forms a cell having a smaller radius than the coverage cell is provided in a coverage cell formed by the coverage base station.

  However, when a certain wireless communication area is configured by a coverage base station and a plurality of capacity booster base stations, power consumption in the wireless communication area is increased as compared to a case where only a coverage base station is configured.

  Since an increase in power consumption in a communication system increases business operation costs (OPEX) and carbon dioxide emissions in a wireless communication business, reduction of power consumption is an important issue. For example, 3GPP, “TS36.300 V9.7.0 Stage 2”, 2011-03, P160 (Non-Patent Document 1) describes the power utilization efficiency when a certain wireless communication area is configured using a plurality of wireless base station devices. The following techniques are disclosed as an example of improvement.

  That is, by utilizing a cell that supplements the capacity of radio communication, the communication load of the radio base station apparatus constituting the coverage cell is reduced, the cell is extinguished when the cell is not needed, and communication The power consumption can be reduced by forming the cell again according to the demand.

  Specifically, when the capacity booster base station receives a communication start instruction from another radio base station apparatus, the capacity booster base station transitions to an active (Active) state in which transmission / reception of a radio signal with the radio terminal apparatus starts, When the amount of communication traffic with the wireless terminal device decreases, the state transits to a dormant state where transmission / reception of wireless signals with the wireless terminal device is stopped.

  By the way, in recent years, not only the power consumption on the radio base station apparatus side but also the power consumption on the radio terminal apparatus side has become a problem. For example, in recent years, multifunctional mobile phone terminals, so-called smartphones, have become widespread. Since this smartphone has various functions as well as a telephone call function, there is a problem that power consumption is large and a battery is consumed quickly. In order to solve such a problem, a technique for suppressing the power consumption of the wireless terminal device by forcibly placing the wireless terminal device in an idle state by the wireless base station device has been studied.

3GPP, "TS36.300 V9.7.0 Stage 2", 2011-03, P160

  As described above, in order for the radio base station apparatus to forcibly place the radio terminal apparatus in the idle state, it is necessary to exchange control information for that purpose between the radio base station apparatus and the upper network side. However, the exchange of control information of the wireless terminal device newly causes a problem that a large load is given to the upper network side.

  The present invention has been made to solve the above-described problems, and an object of the present invention is to provide a radio base station apparatus and a radio that can suppress battery consumption of the radio terminal apparatus without imposing a great load on the upper network side. A terminal device and a communication control method are provided.

  (1) In order to solve the above-described problem, a radio base station apparatus according to an aspect of the present invention includes a transmission / reception unit for transmitting / receiving a radio signal to / from a radio terminal device, and the radio via the transmission / reception unit. A battery information acquisition unit for acquiring battery information related to the state of the battery of the terminal device.

  With such a configuration, the radio base station apparatus can acquire the battery information of the radio terminal apparatus from the radio terminal apparatus. Therefore, if the radio terminal apparatus performs a power saving operation based on the battery information, the upper network It is possible to cause the wireless terminal device to perform a power saving operation without exchanging control information with the. Therefore, the battery consumption of the wireless terminal device can be suppressed without imposing a great load on the upper network side.

  (2) Preferably, it further includes a terminal operation determination unit for determining operation information related to an operation performed in the wireless terminal device based on the battery information.

  According to this configuration, it is possible to cause the wireless terminal device to perform an appropriate operation based on the battery information.

  (3) Preferably, the terminal operation determination unit determines a report cycle of a predetermined measurement result performed by the wireless terminal device as the operation information.

  According to this configuration, it is possible to cause the wireless terminal device to report a predetermined measurement result at an appropriate cycle based on the battery information.

  (4) More preferably, the terminal operation determining unit determines the reporting cycle such that the reporting cycle becomes longer as the remaining battery level of the wireless terminal device is smaller.

  According to this configuration, since the frequency of reporting the predetermined measurement result by the wireless terminal device can be reduced as the remaining battery amount is small, the battery consumption of the wireless terminal device can be suppressed.

  (5) Preferably, the terminal operation determining unit determines a measurement cycle in a predetermined measurement operation performed by the wireless terminal device as the operation information.

  According to this configuration, it is possible to cause the wireless terminal device to perform a predetermined measurement operation at an appropriate period based on the battery information.

  (6) More preferably, the said terminal operation | movement determination part determines the said measurement period so that the said measurement period may become long, so that the battery residual amount of the said radio | wireless terminal apparatus is small.

  According to this configuration, since the frequency of the measurement operation by the wireless terminal device can be reduced as the remaining battery amount is smaller, battery consumption of the wireless terminal device can be suppressed.

  (7) Preferably, the measurement result of the reference signal transmitted from the wireless terminal apparatus to its own radio base station apparatus is acquired, and the frequency of the radio signal transmitted from the wireless terminal apparatus to its own radio base station apparatus is measured. A frequency setting unit for setting based on the result is further provided, and the terminal operation determining unit determines a transmission cycle of the reference signal as the operation information.

  With such a configuration, it is possible to cause the wireless terminal device to transmit the reference signal at an appropriate cycle based on the battery information. An example of such a reference signal is a sounding reference signal (SRS).

  (8) More preferably, the terminal operation determination unit determines the transmission cycle so that the transmission cycle becomes longer as the remaining battery level of the wireless terminal device is smaller.

  With such a configuration, the frequency of reference signal transmission by the wireless terminal device can be reduced as the remaining amount of the battery is smaller, so that battery consumption of the wireless terminal device can be suppressed.

  (9) Preferably, the terminal operation determining unit is configured to transmit the radio terminal device to its own radio base station device based on a relationship between transmission power and power consumption when the radio terminal device transmits a radio signal. A resource related to transmission of a radio signal is determined as the operation information.

  With such a configuration, the radio signal can be transmitted to the radio terminal device under appropriate conditions based on the battery information and the characteristics of the radio terminal device. Therefore, battery consumption of the wireless terminal device can be further suppressed.

  (10) More preferably, as the transmission power of the radio signal in the wireless terminal device increases, the terminal operation determination unit decreases the ratio of the increase in power consumption of the wireless terminal device to the increase in transmission power. In this case, the resource is determined so that a bandwidth for transmitting the radio signal is increased.

  With such a configuration, the wireless terminal device can transmit a wireless signal by a method with low power consumption, and thus can further suppress battery consumption.

  (11) More preferably, when the ratio of the increase amount of the power consumption of the wireless terminal device to the increase amount of the transmission power increases as the transmission power of the radio signal in the wireless terminal device increases, The resource is determined so that the bandwidth for transmitting the radio signal is reduced.

  With such a configuration, the wireless terminal device can transmit a wireless signal by a method with low power consumption, and thus can further suppress battery consumption.

  (12) Preferably, the radio terminal apparatus communicates with the radio base station apparatus based on communication control information received from the radio base station apparatus, and sets an on period and the communication control information to monitor the communication control information. It is possible to perform an intermittent monitoring operation that periodically repeats an off period that is not monitored, and the terminal operation determining unit determines the period of the intermittent monitoring operation of the wireless terminal device as the operation information.

  With such a configuration, it is possible to cause the wireless terminal device to perform an intermittent monitoring operation with an appropriate period based on the battery information.

  (13) More preferably, the terminal operation determination unit determines the cycle of the intermittent monitor operation so that the cycle of the intermittent monitor operation becomes longer as the remaining battery level of the wireless terminal device is smaller.

  With such a configuration, the frequency with which the wireless terminal device monitors the communication control information can be reduced as the remaining amount of the battery decreases, so that the battery consumption of the wireless terminal device can be suppressed.

  (14) Preferably, the terminal operation determination unit does not determine the operation information when the battery information indicates that the state of the battery is being charged.

  Since the wireless terminal device does not need to perform a power saving operation when the battery is being charged, such a configuration can cause the wireless terminal device to perform a power saving operation only when necessary. it can.

  (15) Preferably, the wireless terminal device is capable of selecting a power saving mode in which a power saving operation is performed and a normal mode in which a power saving operation is not performed. A mode information acquisition unit is provided for acquiring mode information indicating which of the power saving mode and the normal mode is selected.

  With such a configuration, in the radio base station apparatus, it can be recognized whether the user has selected whether or not to perform the power saving operation of the radio terminal apparatus.

  (16) More preferably, the terminal operation determination unit determines the operation information when the mode information indicates that the wireless terminal device has selected the power saving mode.

  As described above, by causing the wireless terminal device to perform the power saving operation only when the user selects the power saving mode, it is possible to meet the demand of the user who does not want the power saving mode.

  (17) Preferably, the wireless terminal device transmits received power information indicating a measurement result of the received power of the wireless signal from the wireless base station device to the wireless base station device, and the battery information acquisition unit includes: The battery information included in the received power information is acquired.

  By including the battery information in the received power information in this way, the wireless terminal device does not need to newly send the battery information to the wireless base station device, and battery consumption can be further suppressed.

  (18) Preferably, the wireless terminal device further includes a handover request unit for transmitting a handover request including the battery information to the handover destination wireless base station device when a handover operation of the wireless terminal device is performed.

  According to this configuration, even when the wireless terminal device is handed over, a power saving operation instruction can be given to the wireless terminal device by the handover target wireless base station device.

  (19) In order to solve the above-described problem, a wireless terminal device according to an aspect of the present invention is a wireless terminal device for transmitting / receiving a wireless signal to / from a wireless base station device. A battery state monitoring unit for monitoring the state of the battery, and a battery information transmission unit for transmitting battery information relating to the battery state to the radio base station apparatus.

  In this way, since the wireless terminal device transmits its battery information to the wireless base station device, the wireless base station device does not exchange control information with the higher-level network, and does not exchange control information with the higher-level network. It is possible to cause the wireless terminal device to perform a power saving operation based on the exchanged battery information. Therefore, the battery consumption of the wireless terminal device can be suppressed without imposing a great load on the upper network side.

  (20) Preferably, the battery information transmission unit transmits the battery information according to the remaining amount of the battery.

  According to this configuration, the battery information can be transmitted at an appropriate time according to the remaining battery level of the wireless terminal device.

  (21) More preferably, the battery information transmission unit transmits the battery information when the remaining amount of the battery becomes less than a threshold value.

  According to this configuration, since the battery information is transmitted when the remaining battery level is low, that is, when the wireless terminal device needs to perform power saving operation, battery consumption can be further suppressed. .

  (22) In order to solve the above problem, a communication control method according to an aspect of the present invention includes a step of receiving a radio signal from a radio terminal device, and a radio signal received from the radio signal received in the receiving step. Obtaining battery information regarding the battery status of the device.

  Thus, since the radio base station apparatus can acquire the battery information of the radio terminal apparatus from the radio terminal apparatus, if the radio terminal apparatus performs a power saving operation based on the battery information, It is possible to cause the wireless terminal device to perform a power saving operation without exchanging control information between them. Therefore, the battery consumption of the wireless terminal device can be suppressed without imposing a great load on the upper network side.

  (23) A communication control method according to another aspect of the present invention is a communication control method in a radio terminal apparatus for transmitting and receiving radio signals to and from a radio base station apparatus. Monitoring a battery state, and transmitting battery information relating to the battery state to a wireless base station device forming a cell in which the wireless terminal device is located.

  In this way, since the wireless terminal device transmits its battery information to the wireless base station device, the wireless base station device does not exchange control information with the higher-level network, and does not exchange control information with the higher-level network. It is possible to cause the wireless terminal device to perform a power saving operation based on the exchanged battery information. Therefore, the battery consumption of the wireless terminal device can be suppressed without imposing a great load on the upper network side.

  ADVANTAGE OF THE INVENTION According to this invention, the battery consumption of a radio | wireless terminal apparatus can be suppressed, without applying great load to the high-order network side.

It is a figure which shows the structure of the radio | wireless communications system which concerns on embodiment of this invention. It is a figure which shows the structure of the radio base station apparatus which concerns on embodiment of this invention. It is a figure which shows the structure of the control part in the radio base station apparatus which concerns on embodiment of this invention. It is a figure which shows the structure of the radio | wireless terminal apparatus which concerns on embodiment of this invention. It is a figure which shows the structure of the control part in the radio | wireless terminal apparatus which concerns on embodiment of this invention. It is a flowchart which shows an example of the operation | movement procedure at the time of the radio base station apparatus which concerns on embodiment of this invention notifies operation information with respect to a radio | wireless terminal apparatus. It is a figure which shows an example of the message of the RRC connection reconfiguration instruction | indication which concerns on embodiment of this invention. It is a figure which shows an example of the message of the measurement report which concerns on embodiment of this invention. It is a figure which shows the sequence of operation | movement when the radio base station apparatus which concerns on embodiment of this invention notifies operation information with respect to a radio | wireless terminal apparatus. It is a figure which shows the sequence of operation | movement when the radio base station apparatus which concerns on embodiment of this invention notifies operation information with respect to a radio | wireless terminal apparatus. It is a figure which shows an example of the content of the hand-over request which concerns on embodiment of this invention. It is a figure which shows the sequence of operation | movement when the radio base station apparatus which concerns on embodiment of this invention notifies operation information with respect to a radio | wireless terminal apparatus. It is a figure which shows an example of the content of the hand-over request which concerns on embodiment of this invention. It is a figure which shows the detail of the battery information of FIG. It is a figure which shows an example of the content of the hand-over request which concerns on embodiment of this invention. It is a figure which shows the structure of the control part of the radio base station apparatus which concerns on the modification 1 of embodiment of this invention. It is a flowchart which shows an example of the operation | movement procedure at the time of the radio base station apparatus which concerns on the modification 1 of embodiment of this invention notifies operation information with respect to a radio | wireless terminal apparatus. It is a figure which shows the structure of the control part in the radio base station apparatus which concerns on the modification 2 of embodiment of this invention. It is a figure which shows the method of transmitting the sounding reference signal of the radio | wireless terminal apparatus which concerns on the modification 2 of embodiment of this invention. It is a figure which shows the sequence of operation | movement when the radio base station apparatus which concerns on the modification 3 of embodiment of this invention notifies operation information with respect to a radio | wireless terminal apparatus. It is a figure which shows the characteristic of the radio | wireless terminal apparatus which concerns on the modification 3 of embodiment of this invention. It is a figure which shows the characteristic of the radio | wireless terminal apparatus which concerns on the modification 3 of embodiment of this invention. It is a figure which shows the radio | wireless signal transmission method of the radio | wireless terminal apparatus which concerns on the modification 3 of embodiment of this invention. It is a figure which shows the radio | wireless signal transmission method of the radio | wireless terminal apparatus which concerns on the modification 3 of embodiment of this invention. It is a figure which shows DRX operation | movement of the radio | wireless terminal apparatus which concerns on the modification 4 of embodiment of this invention. It is a figure which shows an example of the content of the battery information which the radio | wireless terminal apparatus which concerns on the modification 5 of embodiment of this invention transmits to a radio base station apparatus. It is a flowchart which shows an example of the operation | movement procedure at the time of the radio | wireless terminal apparatus which concerns on the modification 6 of embodiment of this invention transmits battery information.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. In the drawings, the same or corresponding parts are denoted by the same reference numerals and description thereof will not be repeated.

  The radio base station apparatus notifies the radio terminal apparatus of information about the cell and the neighboring cell that it forms, that is, the frequency of the radio signal and the ID (identification) of the neighboring cell. The wireless terminal device detects and measures neighboring cells based on information notified from the wireless base station device. The wireless terminal device starts moving to the neighboring cell based on the measurement result. Here, “movement” of the wireless terminal device means not only handover but also through which cell the wireless terminal device in an idle state starts communication in the future, that is, when a call or data communication is started. This means selecting whether to perform communication.

  For example, when the wireless terminal device is communicating with the wireless base station device, the destination of the wireless terminal device is determined by the wireless base station device or a higher-level device in the core network. For example, when the wireless terminal device is not communicating with the wireless base station device, the wireless terminal device determines the destination of the wireless terminal device.

  In addition, handover means that a radio base station apparatus that is a communication partner of a radio terminal apparatus during a call or data communication is switched.

  The wireless terminal device is located in a cell means that the wireless terminal device selects a wireless base station device forming the cell as a communication destination and can communicate with the wireless base station device. This means that communication is in progress.

  The femtocell and access mode are described in 3GPP (Third Generation Partnership Project) SPEC TS22.220 as follows. That is, a femto base station is a customer premises apparatus that connects a wireless terminal device connected via a wireless interface to a mobile communication carrier network using an IP backhaul.

  Further, in the femtocell access mode, the femto base station in the closed access mode provides a service only to related CSG (Closed Subscriber Group) members. In addition, the femto base station in the hybrid mode provides services to related CSG members and CSG non-members. The femto base station in the open access mode operates as a normal base station.

  Such a 3GPP definition may also be applied to the wireless communication system according to the embodiment of the present invention.

  Further, the following definitions can be applied together with or separately from the above definitions.

  The macro base station and the pico base station are wireless base station devices that are under the management of the operator and can communicate with the wireless base station device that has contracted with the operator. Further, it is considered that the macro base station and the pico base station are basically not turned off.

  A femto base station is a radio base station apparatus that is mainly installed in an individual or corporation building and may move or be turned off depending on the circumstances of the user.

    Further, the femto base station operates in one of open / hybrid / closed access modes. When the femto base station operates in the closed access mode, only registered members (terminals) can be connected. When operating in the closed access mode, the service is provided only to registered members. When operating in the hybrid mode, the service is provided to both registered members and unregistered members, that is, non-members. When operating in the open access mode, the same operation as that of the macro base station and the pico base station is performed.

[Configuration of wireless communication system]
FIG. 1 is a diagram showing a configuration of a wireless communication system according to an embodiment of the present invention.

  As shown in FIG. 1, the radio communication system is a mobile communication system that complies with LTE (Long Term Evolution) standardized by 3GPP (Third Generation Partnership Project), for example, and includes radio base station apparatuses 101A and 101B. In FIG. 1, two radio base station apparatuses are representatively shown, but a larger number of radio base station apparatuses may be provided.

  Radio base station apparatuses 101A and 101B are, for example, femto base stations, pico base stations, or macro base stations.

  The radio base station apparatus 101A can communicate with the radio terminal apparatus 202 by forming a cell CA and transmitting and receiving radio signals to and from the radio terminal apparatus 202 existing in the cell CA. The radio base station apparatus 101B can communicate with the radio terminal apparatus 202 by forming a cell CB and transmitting and receiving radio signals to and from the radio terminal apparatus 202 existing in the cell CB.

  Here, the direction from the wireless terminal device to the core network is referred to as an uplink direction, and the direction from the core network to the wireless terminal device is referred to as a downlink direction.

[Radio base station equipment]
FIG. 2 is a diagram showing the configuration of the radio base station apparatus according to the embodiment of the present invention.

  Referring to FIG. 2, radio base station apparatus 101 includes antenna 91, circulator 92, radio reception unit 93, radio transmission unit 94, signal processing unit 95, and control unit 98. The signal processing unit 95 includes a reception signal processing unit 96 and a transmission signal processing unit 97. The signal processing unit 95 and the control unit 98 are realized by a CPU (Central Processing Unit) or a DSP (Digital Signal Processor). A combination of the wireless reception unit 93 and the wireless transmission unit 94 corresponds to the transmission / reception unit of the present invention.

  The circulator 92 outputs the radio signal from the radio terminal device 202 received by the antenna 91 to the radio reception unit 93 and outputs the radio signal received from the radio transmission unit 94 to the antenna 91.

  Radio receiving section 93 converts the radio signal received from circulator 92 into a baseband signal or IF (Intermediate Frequency) signal, converts the frequency-converted signal into a digital signal, and outputs the digital signal to received signal processing section 96.

  The received signal processing unit 96 performs signal processing such as despreading in the CDMA (Code Division Multiple Access) method on the digital signal received from the wireless receiving unit 93, and part or all of the digital signal after this signal processing is performed. The data is converted into a predetermined frame format and transmitted to the core network side.

  The transmission signal processing unit 97 performs IFFT (Inverse Fast Fourier Transform) in an OFDM (Orthogonal Frequency Division Multiplex) method on communication data obtained by converting communication data received from the core network side into a predetermined frame format or communication data generated by itself. The digital signal after the signal processing is output to the wireless transmission unit 94.

  The radio transmission unit 94 converts the digital signal received from the transmission signal processing unit 97 into an analog signal, converts the frequency of the converted analog signal into a radio signal, and outputs the radio signal to the circulator 92.

  The control unit 98 exchanges various types of information with each unit and the core network in the radio base station apparatus 101.

  FIG. 3 is a diagram illustrating a configuration of a control unit in the radio base station apparatus according to the embodiment of the present invention.

  Referring to FIG. 3, control unit 98 includes a battery information acquisition unit 11, a terminal operation determination unit 12, and a handover request unit 13.

  The battery information acquisition unit 11 acquires battery information related to the state of the battery of the wireless terminal device 202. Examples of the battery information include information that the battery is charged (during charging), the remaining battery level is greater than or equal to a threshold (High Battery state), and the remaining battery level is less than the threshold (Low Battery state). Can be mentioned.

  The terminal operation determination unit 12 determines whether or not the wireless terminal device 202 should perform a power saving operation based on the battery information described above. When the terminal operation determining unit 12 determines that the power saving operation of the wireless terminal device 202 should be performed, the terminal operation determining unit 12 determines operation information regarding the operation performed in the wireless terminal device, and transmits the determined operation information to the transmission signal. The wireless terminal device 202 is notified via the processing unit 97 and the wireless transmission unit 94.

  In the present embodiment, the terminal operation determination unit 12 determines a measurement cycle in a predetermined measurement operation performed by the wireless terminal device 202 as operation information. The predetermined measurement operation can be exemplified by measurement of a radio signal or measurement of the state of the radio terminal device 202. Specific examples of the measurement of the radio signal include, for example, measurement of reception power of a radio signal transmitted from the radio base station apparatus 101 or measurement of reception quality of a radio signal transmitted from the radio base station apparatus 101. As a specific example of the measurement of the state of the wireless terminal device 202, there is measurement of the moving speed of the wireless terminal device 202. In the present embodiment, the terminal operation determining unit 12 is described as determining the period for measuring the reception power of the radio signal transmitted from each radio base station apparatus performed by the radio terminal apparatus 202 as the operation information.

  When the handover operation of the wireless terminal device 202 is performed, the handover request unit 13 transmits a handover request including the above-described battery information to the handover destination wireless base station device via the core network.

[Wireless terminal device]
FIG. 4 is a diagram illustrating a configuration of the wireless terminal device according to the embodiment of the present invention.

  Referring to FIG. 4, radio terminal apparatus 202 includes antenna 81, circulator 82, radio reception unit 83, radio transmission unit 84, signal processing unit 85, control unit 88, and input / output unit 89. Prepare. The signal processing unit 85 includes a reception signal processing unit 86 and a transmission signal processing unit 87. The signal processing unit 85 and the control unit 88 are realized by a CPU (Central Processing Unit), a DSP (Digital Signal Processor), or the like.

  Circulator 82 outputs the radio signal received from antenna 81 from radio base station apparatus 101 to radio reception unit 83, and outputs the radio signal received from radio transmission unit 84 to antenna 81.

  Radio receiving section 83 converts the radio signal received from circulator 82 into a baseband signal or IF (Intermediate Frequency) signal, converts the frequency-converted signal into a digital signal, and outputs the digital signal to received signal processing section 86.

  The received signal processing unit 86 performs signal processing such as FFT (Fast Fourier Transform) in the OFDM (Orthogonal Frequency Division Multiplex) method on the digital signal received from the wireless receiving unit 83, and outputs one of the digital signals after the signal processing. Part or all of the data is output to the control unit 88.

  The control unit 88 converts the digital signal received from the reception signal processing unit 86 into, for example, audio data and video data, and converts it into an analog signal as necessary. And the control part 88 outputs to the input-output part 89 containing a speaker, a microphone, a display, a key input device, etc.

  Further, the control unit 88 receives, for example, voice data and a control signal for controlling the wireless terminal device 202 received by the key input device from the input / output unit 89. Control unit 88 performs predetermined signal processing on the audio data and control signal received from input / output unit 89 to generate communication data, and outputs the communication data to transmission signal processing unit 87.

  The transmission signal processing unit 87 performs signal processing such as spreading processing in the CDMA (Code Division Multiple Access) system on the communication data received from the control unit 88 or communication data generated by itself, and the digital signal after this signal processing Is output to the wireless transmission unit 84.

  The wireless transmission unit 84 converts the digital signal received from the transmission signal processing unit 87 into an analog signal, converts the frequency of the converted analog signal into a wireless signal, and outputs the radio signal to the circulator 82.

  FIG. 5 is a diagram illustrating a configuration of a control unit in the wireless terminal device according to the embodiment of the present invention.

  Referring to FIG. 5, control unit 88 includes a battery state monitoring unit 21 and a battery information transmission unit 22.

  The battery state monitoring unit 21 monitors the state of the battery of its own wireless terminal device 202.

  The battery information transmission unit 22 transmits battery information indicating the monitoring result of the battery state monitoring unit 21 to the radio base station apparatus 101 that forms a cell in which the wireless terminal apparatus 202 is located. Note that the battery information acquisition unit 11 of the radio base station apparatus 101 described above acquires this battery information.

[Notification of operation information]
Next, an operation procedure when the radio base station apparatus according to the embodiment of the present invention notifies operation information to the radio terminal apparatus will be described in detail.

  The radio base station apparatus and the radio terminal apparatus in the communication system according to the embodiment of the present invention read and execute a program including the following sequences and steps in the flowcharts from a memory (not shown). This program can be installed externally. The installed program is distributed in a state stored in a recording medium, for example.

  FIG. 6 is a flowchart that defines an operation procedure when the radio base station apparatus according to the embodiment of the present invention notifies the radio terminal apparatus of operation information.

  First, the battery information acquisition unit 11 acquires battery information of the wireless terminal device 202 (step S1).

  Next, the terminal operation determination unit 12 determines whether or not the battery of the wireless terminal device 202 is charged based on the battery information acquired by the battery information acquisition unit 11 (step S2). If the terminal operation determining unit 12 determines that the battery of the wireless terminal device 202 is charged (Yes in step S2), the terminal operation determining unit 12 ends the process without determining the operation information.

  If the terminal operation determining unit 12 determines that the wireless terminal device 202 is not charged (No in Step S2), it next determines whether or not the remaining amount of the battery is greater than or equal to a threshold (Step S3). The threshold of the remaining battery level can be set as appropriate based on the battery capacity of the wireless terminal device 202 or the like. For example, it is preferable to set the threshold value of the remaining battery level to such a value that there is a high possibility that the remaining battery level becomes empty after a short time after the remaining battery level becomes less than the threshold value. For example, 30% of the battery capacity can be set as the threshold value.

  If the terminal operation determining unit 12 determines that the remaining battery level is equal to or greater than the threshold (Yes in step S3), the terminal operation determining unit 12 ends the process without determining the operation information. On the other hand, when determining that the remaining battery level is less than the threshold value (No in step S3), the terminal operation determining unit 12 determines the operation information and notifies the wireless terminal device 202 of the determined operation information (step S4). . For example, the terminal operation determination unit 12 determines that the cycle in which the radio terminal device 202 measures the received power of the radio signal transmitted from each radio base station device is longer than the current measurement cycle, and this determination is made. The wireless terminal device 202 is notified of the measurement cycle.

  As described above, the radio base station apparatus 101 can suppress battery consumption in the radio terminal apparatus 202 by causing the radio terminal apparatus 202 to perform a power saving operation.

  Next, details of an operation when the radio base station apparatus acquires battery information from the radio terminal apparatus and notifies the radio terminal apparatus of operation information based on the acquired battery information will be described. The wireless terminal device measures the received power of the wireless signal transmitted from each wireless base station device, and uses the measurement result as a measurement report (Measurement Report) to the wireless base station device that forms the cell in which it is located. Send. There are two types of timings at which the wireless terminal device transmits the measurement report to the wireless base station device, a type that is periodically transmitted and a type that is transmitted when an event occurs.

  The radio base station apparatus 101 can designate at least one of the following two types as a method by which the radio terminal apparatus 202 transmits battery information to the radio base station apparatus 101. The first type (type 1) is a type in which battery information is included in a measurement report that is periodically transmitted. The second type (type 2) is a type in which battery information is included in a measurement report transmitted when an event occurs.

  In addition, the radio base station apparatus 101 specifies the transmission timing of the battery information transmitted by the radio terminal apparatus 202 in an RRC (Radio Resource Control) connection reconfiguration instruction (RRC Connection Reconfiguration) transmitted to the radio terminal apparatus 202. Can do.

  FIG. 7 is a diagram showing an example of the contents of the RRC connection reconfiguration instruction according to the embodiment of the present invention.

  As illustrated in the lower part of FIG. 7, the radio base station apparatus 101 can specify the timing (triggerType) for transmitting battery information in the RRC connection reconfiguration instruction. As this timing, a timing (periodic) of transmitting battery information included in a measurement report that is periodically transmitted and a timing (event) of transmitting battery information included in a measurement report that is transmitted when an event occurs are specified. be able to. Also, the radio base station apparatus 101 can specify the battery information transmission cycle (reportInterval) in the RRC connection reconfiguration instruction when battery information is included in a measurement report that is periodically transmitted.

  FIG. 8 is a diagram showing an example of the contents of a measurement report including battery information. As shown in the lower part of FIG. 8, the battery information included in the measurement report is, specifically, as a parameter of BatteryInfo, the remaining battery level is greater than or equal to the threshold (High), the remaining battery level is less than the threshold (Low), or being charged (Recharging) can be set.

  Hereinafter, the operation in which the radio base station apparatus notifies the radio terminal apparatus of operation information will be described separately for Type 1 and Type 2. Regarding the operation of the radio base station apparatus in type 2, each radio base station apparatus performs communication between each radio base station apparatus according to X2AP (X2 Application Protocol) (type 2 (X2AP)) and each radio according to S1AP (S1 Application Protocol). The description will be divided into two types (type 2 (S1AP)) in which communication is performed between the base station device and the host device.

(Type 1)
In FIG. 9, the radio base station apparatus 101 notifies the radio terminal apparatus 202 of operation information based on the battery information included in the measurement report periodically transmitted from the radio terminal apparatus 202 to the radio base station apparatus 101. It is a figure which shows an example of the sequence of operation | movement.

  As shown in FIG. 9, first, the radio base station apparatus 101 transmits an RRC connection reconfiguration instruction to the radio terminal apparatus 202 (step S11).

  When the RRC connection is established between the wireless terminal device 202 and the wireless base station device 101, the wireless terminal device 202 transmits an RRC connection reconfiguration complete notification (RRC Connection Reconfiguration Complete) to the wireless base station device 101 ( Step S12).

  Next, based on the content of the RRC connection reconfiguration instruction from the radio base station apparatus 101, the radio terminal apparatus 202 periodically measures the received power of the radio signal transmitted from each radio base station apparatus (step S13). . And the radio | wireless terminal apparatus 202 transmits this measurement result to the radio base station apparatus 101 as a measurement report (step S14). The measurement report sent to the wireless base station device 101 includes battery information of the wireless terminal device 202. The transmission cycle of the measurement report can be set, for example, from 120 milliseconds to 60 minutes, and is generally 1 second in many cases. Here, since it is unlikely that a change in the remaining amount of the battery will appear at an interval of 1 second, the wireless terminal device 202 includes battery information at a cycle of about 15 minutes, for example, for a measurement report transmitted at a cycle of 1 second. be able to.

  Next, based on the battery information acquired from the wireless terminal device 202, the wireless base station device 101 determines whether or not the battery of the wireless terminal device 202 is charged and whether or not the remaining amount of the battery is greater than or equal to a threshold value. to decide. When the radio base station apparatus 101 determines that the battery of the radio terminal apparatus 202 is not charged and the remaining battery level is less than the threshold value, the measurement period of the received power in the radio terminal apparatus 202 is obtained as operation information. Is determined (step S15). Note that the measurement cycle determined as the operation information is longer than the measurement cycle currently performed in the wireless terminal device 202.

  Next, the radio base station apparatus 101 notifies the radio terminal apparatus 202 of the operation information, that is, the measurement period of the received power determined in step S15 in the RRC connection reconfiguration instruction (step S16).

  Next, when the RRC connection is established between the radio terminal apparatus 202 and the radio base station apparatus 101, the radio terminal apparatus 202 transmits an RRC connection reconfiguration completion notification to the radio base station apparatus 101 (step S17). . Thereby, according to the content of the RRC connection reconfiguration instruction from the radio base station apparatus 101, the radio terminal apparatus 202 measures the reception power of the radio signal transmitted from each radio base station apparatus as the RRC connection in step S17. It becomes longer than the measurement cycle before the reconfiguration completion notification is transmitted.

(Type 2 (X2AP))
FIG. 10 illustrates an operation in which the radio base station apparatus gives an instruction regarding the power saving operation to the radio terminal apparatus based on the battery information included in the measurement report transmitted from the radio terminal apparatus to the radio base station apparatus when an event occurs. It is a figure which shows an example of a sequence.

  As shown in FIG. 10, first, the radio base station apparatus 101A transmits an RRC connection reconfiguration instruction to the radio terminal apparatus 202 (step S21).

  When the RRC connection is established between the wireless terminal device 202 and the wireless base station device 101A, the wireless terminal device 202 transmits an RRC connection reconfiguration completion notification to the wireless base station device 101A (step S22).

  Next, the wireless terminal device 202 determines that an event has occurred as a result of measuring the received power of the wireless signal transmitted from each wireless base station device (step S23). In the present embodiment, the event is that the communication state of the wireless terminal device 202 with the wireless base station device 101A is deteriorated and the communication state with other wireless base station devices other than the wireless base station device 101A is improved. Means that.

  When determining that an event has occurred, the wireless terminal device 202 transmits a measurement report to the wireless base station device 101A (step S24). The measurement report sent to the wireless base station device 101A includes the battery information of the wireless terminal device 202.

  Next, 101 A of radio base station apparatuses acquire the measurement information which shows the measurement result for every cell ID based on the measurement report received from the radio | wireless terminal apparatus 202, and the battery information of the radio | wireless terminal apparatus 202, The memory | storage part which is not shown in figure (Step S25).

  Next, based on the measurement report received from the wireless terminal device 202, the wireless base station device 101A determines whether or not the wireless terminal device 202 should be handed over. For example, the radio base station apparatus 101B is determined as a handover destination (step S26).

  Next, the radio base station apparatus 101A transmits a handover request to the radio base station apparatus 101B (step S27). This handover request includes battery information of the wireless terminal device 202.

  FIG. 11 is a diagram showing an example of the contents of the handover request in the embodiment of the present invention. As shown at the bottom of FIG. 11, the battery information included in the handover request specifically includes, as parameters of Battery Information, the remaining battery level is equal to or higher than the threshold (High), the remaining battery level is lower than the threshold (Low), or Recharging can be set.

  The description will be continued with reference to FIG. Next, the radio base station apparatus 101B acquires the battery information of the radio terminal apparatus 202 included in the handover request and saves it in a storage unit (not shown) (step S28). Then, based on the battery information of the wireless terminal device 202 acquired from the wireless base station device 101A, the wireless base station device 101B determines whether or not the battery of the wireless terminal device 202 is charged, and the remaining amount of the battery is greater than or equal to the threshold value. Judge whether there is. When the radio base station apparatus 101B determines that the battery of the radio terminal apparatus 202 is not charged and the remaining battery level is less than the threshold value, the radio base station apparatus 101B determines the reception power measurement period in the radio terminal apparatus 202 as operation information. (Step S29). Note that the measurement cycle determined as the operation information is longer than the measurement cycle currently performed in the wireless terminal device 202.

  Next, the radio base station apparatus 101B transmits a handover response to the handover request from the radio base station apparatus 101A to the radio base station apparatus 101A (step S30). When transmitting the handover response, the radio base station apparatus 101B transmits the operation information, that is, the measurement cycle determined in step S29, to the radio base station apparatus 101A.

  When receiving the handover response from the radio base station apparatus 101B, the radio base station apparatus 101A notifies the radio terminal apparatus 202 of the measurement cycle determined in step S29 in the RRC connection reconfiguration instruction (step S31).

  Next, the wireless base station device 101A transmits a state notification indicating its own communication state and the like to the wireless base station device 101B (step S32).

  When the RRC connection is established between the wireless terminal device 202 and the wireless base station device 101B, the wireless terminal device 202 transmits an RRC connection reconfiguration completion notification to the wireless base station device 101B (step S33). Then, according to the content of the RRC connection reconfiguration instruction from the radio base station device 101A, the radio terminal device 202 measures the reception power of the radio signal transmitted from each radio base station, and the RRC connection reconfiguration in step S33 is performed. It becomes longer than the measurement cycle before sending the completion notification.

  Next, the radio base station apparatus 101B receives the RRC connection reconfiguration completion notification from the radio terminal apparatus 202, and transmits a handover completion notification and a terminal information release instruction to the radio base station apparatus 101A (step S34).

  Next, the wireless base station device 101A receives the handover completion notification and the terminal information release instruction, releases the information related to the wireless terminal device 202, and transmits the terminal information release completion notification to the wireless base station device 101B (step S35). ).

(Type 2 (S1AP))
FIG. 12 is a sequence of operations in which the radio base station apparatus gives an instruction regarding the power saving operation to the radio terminal apparatus based on the battery information included in the measurement report transmitted from the radio terminal apparatus to the radio base station apparatus when an event occurs. It is a figure which shows an example.

  As shown in FIG. 12, first, the radio base station apparatus 101A transmits an RRC connection reconfiguration instruction to the radio terminal apparatus 202 (step S41).

  When the RRC connection is established between the wireless terminal device 202 and the wireless base station device 101A, the wireless terminal device 202 transmits an RRC connection reconfiguration completion notification to the wireless base station device 101A (step S42).

  Next, the wireless terminal device 202 determines that an event has occurred as a result of measuring the received power of the wireless signal transmitted from each wireless base station device (step S43). In the present embodiment, the event is that the communication state of the wireless terminal device 202 with the wireless base station device 101A is deteriorated and the communication state with other wireless base station devices other than the wireless base station device 101A is improved. Means that.

  When determining that an event has occurred, the wireless terminal device 202 transmits a measurement report to the wireless base station device 101A (step S44). The measurement report sent to the wireless base station device 101A includes the battery information of the wireless terminal device 202.

  Next, 101 A of radio base station apparatuses acquire the measurement information which shows the measurement result for every cell ID based on the measurement report received from the radio | wireless terminal apparatus 202, and the battery information of the radio | wireless terminal apparatus 202, The memory | storage part which is not shown in figure (Step S45).

  Next, based on the measurement report received from the wireless terminal device 202, the wireless base station device 101A determines whether or not the wireless terminal device 202 should be handed over. For example, the radio base station apparatus 101B is determined as a handover destination (step S46).

  Next, the radio base station device 101A transmits a handover request indicating the radio base station device 101B to the higher-level device (step S47). This handover request includes battery information of the wireless terminal device 202.

  FIG. 13 is a diagram illustrating an example of the contents of a handover request in the embodiment of the present invention, and FIG. 14 is a diagram illustrating details of the battery information of FIG. As shown in the lowermost part of FIG. 13 and FIG. 14, the battery information included in the handover request is, specifically, as a parameter of Battery Information, the remaining battery level is equal to or higher than the threshold (High), and the remaining battery level is lower than the threshold (Low ) Or recharging can be set.

  Referring to FIG. 12 again, next, the upper apparatus receives the handover request from radio base station apparatus 101A and transmits the handover request to radio base station apparatus 101B (step S48). This handover request also includes battery information of the wireless terminal device 202.

  FIG. 15 is a diagram showing an example of the contents of the handover request according to the embodiment of the present invention. As shown at the bottom of FIG. 15, the battery information in the handover request from the higher-level apparatus to the radio base station apparatus 101B is the same as that in the handover request from the radio base station apparatus 101A to the higher-level apparatus described above.

  Referring to FIG. 12 again, next, radio base station apparatus 101B acquires battery information of radio terminal apparatus 202 included in the handover request, and stores it in a storage unit (not shown) (step S49).

  Based on the acquired battery information of the wireless terminal device 202, the wireless base station device 101B determines whether the battery of the wireless terminal device 202 is charged and whether the remaining amount of the battery is equal to or greater than a threshold value. Then, when the radio base station apparatus 101B determines that the battery of the radio terminal apparatus 202 is not charged and the remaining battery level is less than the threshold value, as the operation information, the measurement cycle of the received power in the radio terminal apparatus 202 Is determined (step S50). Note that the measurement cycle determined as the operation information is longer than the measurement cycle currently performed in the wireless terminal device 202.

  Next, the radio base station apparatus 101B transmits a handover response to the handover request from the upper apparatus to the upper apparatus (step S51). At the time of transmitting this handover response, the radio base station apparatus 101B also transmits the operation information, that is, the measurement cycle determined in step S50, to the higher-level apparatus.

  Next, the upper apparatus receives a handover response from the radio base station apparatus 101B, and transmits a handover instruction to the radio base station apparatus 101A (step S52). This handover instruction includes operation information.

  Next, wireless base station apparatus 101A receives the handover instruction from the host apparatus, and transmits the measurement cycle determined in step S50 to wireless terminal apparatus 202 in the RRC connection reconfiguration instruction (step S53).

  Next, the wireless base station device 101A transmits a status notification indicating its own communication status and the like to the higher-level device (step S54).

  Next, the higher-level device receives the status notification from the radio base station device 101A, and transmits a status notification indicating communication contents and the like with the radio terminal device 202 to the radio base station device 101B (step S55).

  When the RRC connection is established between the wireless terminal device 202 and the wireless base station device 101B, the wireless terminal device 202 transmits an RRC connection reconfiguration completion notification to the wireless base station device 101B (step S56). Then, according to the content of the RRC connection reconfiguration instruction from the radio base station device 101A, the radio terminal device 202 measures the received power of the radio signal transmitted from each radio base station, and the RRC connection reconfiguration in step S56 It becomes longer than the measurement cycle before sending the completion notification.

  Next, the radio base station apparatus 101B receives the RRC connection reconfiguration completion notification from the radio terminal apparatus 202 and transmits a handover completion notification to the higher-level apparatus (step S57).

  Next, the higher-level apparatus receives a handover completion notification from the radio base station apparatus 101B and transmits a terminal information release instruction to the radio base station apparatus 101A (step S58).

  Next, the wireless base station device 101A receives a terminal information release instruction from the higher-level device, releases information related to the wireless terminal device 202, and transmits a terminal information release completion notification to the higher-level device (step S59).

  In the radio base station apparatus according to the above embodiment, the radio reception unit 93 and the radio transmission unit 94 transmit and receive radio signals to and from the radio terminal device 202. Then, the battery information acquisition unit 11 acquires battery information regarding the state of the battery of the wireless terminal device 202.

  Thus, since the radio base station apparatus 101 can acquire the battery information of the radio terminal apparatus 202 from the radio terminal apparatus 202, if the radio terminal apparatus performs a power saving operation based on the battery information, the upper network It is possible to cause the wireless terminal device 202 to perform a power saving operation without exchanging control information with the. Therefore, the battery consumption of the wireless terminal device 202 can be suppressed without imposing a great load on the host network side.

  Further, in the radio base station apparatus according to the embodiment of the present invention, the terminal operation determination unit 12 determines operation information related to the operation performed in the radio terminal apparatus 202 based on the battery information acquired by the battery information acquisition unit 11.

  According to this configuration, it is possible to cause the wireless terminal device 202 to perform an appropriate operation based on the battery information.

  In the radio base station apparatus according to the embodiment of the present invention, the terminal operation determination unit 12 determines a measurement cycle in a predetermined measurement operation performed by the radio terminal apparatus 202 as operation information.

  According to this configuration, it is possible to cause the wireless terminal device 202 to perform a measurement operation at an appropriate period based on the battery information.

  Further, in the radio base station apparatus according to the embodiment of the present invention, the terminal operation determination unit 12 determines the measurement cycle so that the measurement cycle in the radio terminal device 202 becomes longer as the remaining battery level of the radio terminal device 202 decreases. .

  According to this configuration, the frequency of the measurement operation by the wireless terminal device 202 can be reduced as the remaining battery amount is smaller, and thus the battery consumption of the wireless terminal device 202 can be suppressed.

  In the radio base station apparatus according to the embodiment of the present invention, the terminal operation determination unit 12 does not determine the operation information when the battery information indicates that the battery state is being charged.

  Since the wireless terminal device 202 does not need to perform a power saving operation when the battery is being charged, such a configuration allows the wireless terminal device 202 to perform a power saving operation only when necessary. be able to.

  In the radio base station apparatus according to the embodiment of the present invention, the radio terminal apparatus 202 transmits received power information indicating the measurement result of the received power of the radio signal from the radio base station apparatus to its own radio base station apparatus 101. To do. The battery information acquisition unit 11 acquires battery information included in the received power information.

  By including the battery information in the received power information in this way, the wireless terminal device 202 does not need to newly send the battery information to the wireless base station device 101, and battery consumption can be further suppressed.

  In the radio base station apparatus according to the embodiment of the present invention, the radio base station apparatus 101A further includes a handover request unit 13 that transmits a handover request including battery information to the radio base station apparatus 101B that is the handover destination.

  According to this configuration, even when the wireless terminal device 202 is handed over, a power saving operation instruction can be given to the wireless terminal device 202 by the handover target wireless base station device 101B.

  Further, the wireless terminal device according to the embodiment of the present invention transmits and receives a wireless signal to and from the wireless base station device 101, and monitors the state of the battery in its own wireless terminal device, A battery information transmission unit 22 for transmitting battery information related to the battery state to the radio base station apparatus 101;

  Thus, since the wireless terminal device 202 transmits its battery information to the wireless base station device 101, the wireless base station device 101 communicates with this wireless terminal device without exchanging control information with the higher level network. It is possible to cause the wireless terminal device 202 to perform a power saving operation based on battery information exchanged between them. Therefore, the battery consumption of the wireless terminal device 202 can be suppressed without imposing a great load on the host network side.

  The above embodiment should be considered as illustrative in all points and not restrictive. The scope of the present invention is defined by the terms of the claims, rather than the description above, and is intended to include any modifications within the scope and meaning equivalent to the terms of the claims. For example, the above-described embodiment can be changed as in a modification described below.

[Modification 1]
The wireless terminal device 202 according to the modification 1 can select the power saving mode in which the power saving operation is performed and the normal mode in which the power saving operation is not performed.

  FIG. 16 is a diagram illustrating a configuration of a control unit in the radio base station apparatus according to the first modification. As shown in FIG. 16, in the radio base station apparatus 101 according to the first modification, the control unit 98 includes a mode information acquisition unit 14 in addition to the battery information acquisition unit 11 and the terminal operation determination unit 12.

  The mode information acquisition unit 14 acquires mode information regarding the mode selected by the wireless terminal device 202. This mode includes the power saving mode and the normal mode described above.

  FIG. 17 is a flowchart that defines an operation procedure when the radio base station apparatus according to Modification 1 notifies the radio terminal apparatus of operation information.

  As shown in FIG. 17, first, the mode information acquisition unit 14 acquires mode information of the wireless terminal device 202 (step S71).

  Next, the battery information acquisition unit 11 determines whether or not the mode of the wireless terminal device 202 is the power saving mode (step S72). When the battery information acquisition unit 11 determines that the mode of the wireless terminal device 202 is not the power saving mode (No in step S72), the terminal operation determination unit 12 ends the process without determining the operation information.

  When the battery information acquisition unit 11 determines that the mode of the wireless terminal device 202 is the power saving mode (Yes in step S72), the battery information acquisition unit 11 acquires the battery information of the wireless terminal device 202 (step S1). Since the process after step S1 is the same as that of the embodiment described above, the description will not be repeated.

  In the radio base station apparatus according to the first modification, the radio terminal apparatus 202 can select a power saving mode in which the power saving operation is performed and a normal mode in which the power saving operation is not performed. The radio base station apparatus 101 further includes a mode information acquisition unit 14 for acquiring mode information regarding the mode selected by the radio terminal apparatus.

  With such a configuration, the radio base station apparatus 101 can recognize whether the user has selected whether or not to operate the radio terminal apparatus 202 in the power saving mode.

  Further, in the radio base station apparatus according to the first modification, the terminal operation determination unit 12 determines the operation information when the mode information indicates that the radio terminal apparatus 202 is in the power saving mode.

  As described above, by causing the wireless terminal device 202 to perform the power saving operation only when the user selects the power saving mode, it is possible to meet the demand of the user who does not want the power saving mode.

[Modification 2]
The radio base station apparatus according to the second modification uses a sounding reference signal (SRS) that the radio terminal apparatus 202 transmits to the radio base station apparatus 101, the operation information determined by the terminal operation determination unit 12 in the above embodiment. This is the transmission cycle. In addition, it can be the same as that of embodiment mentioned above except operation information.

  FIG. 18 is a diagram illustrating a configuration of the control unit 98 in the radio base station apparatus 101 according to the second modification. As illustrated in FIG. 18, the control unit 98 of the radio base station apparatus 101 according to Modification 2 further includes a frequency setting unit 15 in addition to the battery information acquisition unit 11 and the terminal operation determination unit 12.

  The frequency setting unit 15 acquires the measurement result of the sounding reference signal from the wireless terminal device 202, and sets the frequency of the wireless signal that the wireless terminal device 202 sends to the wireless base station device 101 based on the measurement result. Note that the measurement of the sounding reference signal from the wireless terminal device 202 is performed by the received signal processing unit 96.

  And the terminal operation | movement determination part 12 in the wireless base station apparatus 101 determines the transmission period of the sounding reference signal which the wireless terminal apparatus 202 sends to the wireless base station apparatus 101 as operation information. Specifically, when the terminal operation determining unit 12 determines that the remaining battery level of the wireless terminal device 202 is less than the threshold, the transmission period of the sounding reference signal in the wireless terminal device 202 is determined, and the determined transmission The period is longer than the transmission period of the sounding reference signal when the remaining battery level is equal to or greater than the threshold value. Then, the terminal operation determination unit 12 notifies the wireless terminal device of the determined transmission period of the sounding reference signal.

  The sounding reference signal is a radio signal transmitted from the radio terminal apparatus 202 to the radio base station apparatus 101 for the purpose of frequency scheduling, MCS (Modulation and Coding Scheme) determination, precoder selection, and the like.

  FIG. 19 is a diagram illustrating a method in which the wireless terminal device transmits a sounding reference signal to the wireless base station device. As shown in FIG. 19, the radio | wireless terminal apparatus 202 transmits a sounding reference signal in order from a some antenna. Also, the wireless terminal device 202 transmits a sounding reference signal at a constant period in a plurality of bands. The reception signal processing unit 96 in the radio base station apparatus 101 measures this sounding reference signal. The frequency setting unit 15 acquires the measurement result, and sets the frequency of the radio signal transmitted from the radio terminal apparatus 202 to the radio base station apparatus 101 based on the measurement result.

  In the radio base station apparatus according to the modified example 2, the terminal operation determination unit 12 determines the transmission period of the sounding reference signal to be transmitted from the radio terminal apparatus 202 to its own radio base station apparatus 101 as the operation information.

  With such a configuration, it is possible to cause the wireless terminal device 202 to transmit the sounding reference signal at an appropriate cycle based on the battery information.

  Further, in the radio base station apparatus according to Modification 2, the terminal operation determination unit 12 sets the transmission cycle so that the transmission cycle of the sounding reference signal in the radio terminal device 202 becomes longer as the remaining battery level of the radio terminal device 202 decreases. decide.

  With such a configuration, the sounding reference signal to be transmitted to the wireless terminal device 202 can be transmitted less frequently as the remaining battery level is lower, so that the battery consumption of the wireless terminal device 202 can be suppressed.

[Modification 3]
In the radio base station apparatus according to the modified example 3, the terminal operation determination unit 12 in the above embodiment uses the radio base station 202 as a base station based on the relationship between the power consumption and the transmission power in the radio terminal apparatus 202 as the operation information. Resources relating to transmission of radio signals to the station apparatus 101 are determined. In addition, it can be the same as that of embodiment mentioned above except operation information.

  In the radio base station apparatus 101 according to the modified example 3, the terminal operation determination unit 12 uses the radio terminal apparatus as operation information based on the relationship between transmission power and power consumption when the radio terminal apparatus 202 transmits a radio signal. A resource related to transmission of a radio signal from 202 to the radio base station apparatus 101 is determined.

  The operation for notifying the wireless terminal device of this operation information will be described in detail with reference to FIG. FIG. 20 is a diagram illustrating an operation sequence when the radio base station apparatus according to Modification 3 notifies the radio terminal apparatus of operation information. The process until the radio base station apparatus 101 determines the operation information based on the battery information and determines whether or not to notify the radio terminal apparatus 202 of the determined operation information is the same as in the above-described embodiment. Therefore, the description will not be repeated.

  When the radio base station apparatus 101 determines to determine and notify the operation information to the radio terminal apparatus 202 based on the battery information received from the radio terminal apparatus 202, the radio base station apparatus 101 sets the power consumption type of the radio terminal apparatus 202 to the host apparatus. An inquiry is made (step S81). The radio base station apparatus 101 also receives an ID for identifying the radio terminal apparatus 202 from the radio terminal apparatus 202.

  The power consumption type of the wireless terminal device 202 includes, for example, a type in which the ratio of the increase in power consumption to the increase in transmission power decreases as the transmission power increases as illustrated in FIG. FIG. 21 is a diagram illustrating a relationship between transmission power and power consumption in the wireless terminal device. In addition, there is a type in which the ratio of the increase in power consumption to the increase in transmission power increases as the transmission power increases as shown in FIG. FIG. 22 is also a diagram illustrating a relationship between transmission power and power consumption in the wireless terminal device. Such a power consumption type is determined in advance for each wireless terminal device, and the host device stores information on the power consumption type corresponding to the ID of each wireless terminal device in a storage unit (not shown).

  Next, the higher-level device returns the power consumption type of the wireless terminal device 202 to the wireless base station device 101 (step S82).

  Upon receiving an answer from the higher-level device, the radio base station device 101 determines a resource related to transmission of a radio signal to the radio base station device 101 (step S83), and uses the determined content as an RRC connection reconfiguration instruction. It transmits to the terminal device 202 (step S84).

  FIG. 23 is a diagram illustrating resources allocated to the wireless terminal device 202 when the wireless terminal device 202 transmits a wireless signal. In FIG. 23, each block obtained by dividing the resource in the frequency axis direction and the time axis direction is a resource block, and the resource block indicated by hatching in the figure is a resource allocated to the wireless terminal device 202. For example, when the power consumption type of the wireless terminal device 202 is the type as shown in FIG. 21, the wireless base station device 101 can transmit data in a short time using the wide bandwidth as shown in FIG. Such resources are allocated to the wireless terminal apparatus 202, and information on the allocated resources is notified to the wireless terminal apparatus 202 as operation information.

  FIG. 24 is a diagram illustrating resources allocated to the wireless terminal device 202 when the wireless terminal device 202 transmits a wireless signal. In FIG. 24, each block obtained by dividing the resource in the frequency axis direction and the time axis direction is a resource block, and the resource block indicated by hatching in the figure is a resource allocated to the wireless terminal device 202. For example, when the power consumption type of the wireless terminal device 202 is a type as shown in FIG. 22, the wireless base station device 101 transmits data in a long time using the narrow bandwidth as shown in FIG. Resources that can be assigned are allocated to the wireless terminal apparatus 202, and information on the allocated resources is notified to the wireless terminal apparatus 202 as operation information.

  When the RRC connection is established between the radio terminal apparatus 202 and the radio base station apparatus 101, the radio terminal apparatus 202 transmits an RRC connection reconfiguration completion notification to the radio base station apparatus 101 (step S85).

  In the radio base station apparatus according to the third modification, the terminal operation determination unit 12 uses the radio terminal apparatus 202 as operation information based on the relationship between transmission power and power consumption when the radio terminal apparatus 202 transmits a radio signal. To determine a resource related to transmission of a radio signal from the mobile station to its own radio base station apparatus 101.

  With such a configuration, it is possible to cause the wireless terminal device 202 to transmit a wireless signal under appropriate conditions based on the battery information and the characteristics of the wireless terminal device 202. Therefore, battery consumption of the wireless terminal device can be further suppressed.

  Also, in the radio base station apparatus according to the modification 3, the terminal operation determining unit 12 is configured such that the ratio of the increase in power consumption to the increase in transmission power decreases as the radio signal transmission power in the radio terminal apparatus 202 increases. The resource is determined so that the bandwidth for transmitting the radio signal is increased.

  With such a configuration, the wireless terminal device 202 can transmit a wireless signal by a method with low power consumption, and thus can further suppress battery consumption.

  Also, in the radio base station apparatus according to Modification 3, the terminal operation determining unit 12 may increase the ratio of the increase in power consumption to the increase in transmission power as the radio signal transmission power in the radio terminal 202 increases. The resource is determined so that the bandwidth when transmitting the radio signal is reduced.

  With such a configuration, the wireless terminal device 202 can transmit a wireless signal by a method with low power consumption, and thus can further suppress battery consumption.

[Modification 4]
The radio base station apparatus according to Modification 4 uses the operation information determined by the terminal operation determination unit 12 in the above embodiment as the period of a DRX (Discontinuous Reception) operation. In addition, it can be the same as that of embodiment mentioned above except operation information.

  In the fourth modification, the wireless terminal device 202 communicates with its own radio base station device based on the communication control information received from its own radio base station device, and the on-period and communication control information to monitor the communication control information. An intermittent monitoring operation, for example, a DRX operation, which periodically repeats an off period during which no monitoring is performed, is performed. And the terminal operation | movement determination part 12 in the wireless base station apparatus 101 determines the period of DRX operation | movement of the wireless terminal device 202 as operation | movement information.

  Hereinafter, the DRX operation performed by the wireless terminal device 202 will be described with reference to FIG. FIG. 25 is a diagram illustrating DRX operation of the wireless terminal device.

  As illustrated in FIG. 25, the radio terminal device 202 receives a DRX operation execution instruction from the radio base station device 101, for example, and receives communication control information from the radio base station device 101, for example, PDCCH (for each DRX cycle Tdrx). Monitor Physical Downlink Control Channel). More specifically, the radio terminal apparatus 202 monitors the PDCCH in the on period Ton and stops monitoring the PDCCH in the off period Toff in the DRX cycle Tdrx. The on period Ton corresponds to “Active Time” in LTE. Further, for example, a period in which uplink data transmitted by the wireless terminal device 202 exists is “Active Time”.

  When the terminal operation determining unit 12 in the radio base station apparatus 101 determines that the remaining battery level of the radio terminal apparatus 202 is less than the threshold based on the information from the battery information acquisition unit 11, the DRX operation in the radio terminal apparatus 202 is performed. Is newly determined. Note that this determined cycle is longer than the cycle of the DRX operation currently being performed in the wireless terminal device 202. When the terminal operation determination unit 12 notifies the wireless terminal device 202 of the determined DRX operation cycle as operation information, the wireless terminal device 202 performs an operation of extending the DRX operation cycle, that is, the DRX cycle Tdrx.

  In the radio base station apparatus according to the fourth modification, the radio terminal apparatus 202 communicates with the radio base station apparatus 101 based on the communication control information received from the radio base station apparatus 101, and should monitor the communication control information. It is possible to perform an intermittent monitoring operation that periodically repeats an off period Toff in which Ton and communication control information are not monitored. And the terminal operation | movement determination part 12 determines the period of DRX operation | movement of the radio | wireless terminal apparatus 202 as operation | movement information.

  With such a configuration, it is possible to cause the wireless terminal device 202 to perform DRX operation with an appropriate period based on the battery information.

  Further, in the radio base station apparatus according to Modification 4, the terminal operation determination unit 12 determines the period of the intermittent monitor operation so that the DRX operation period becomes longer as the remaining battery level of the radio terminal apparatus 202 decreases.

  With such a configuration, the frequency of monitoring the communication control information to be performed by the wireless terminal device 202 can be reduced as the remaining battery level is small, and thus the battery consumption of the wireless terminal device 202 can be suppressed.

[Modification 5]
In the above embodiment, the wireless terminal device 202 includes the battery information in the measurement report and transmits it to the wireless base station device 101. However, the battery information is not included in the measurement report, but only the battery information is transmitted to the wireless base station device 101. 101 may be transmitted.

  FIG. 26 is a diagram illustrating an example of the content of the battery information transmitted from the wireless terminal device according to Modification 5 to the wireless base station device. As shown in the lower part of FIG. 26, the battery information is specifically set as a parameter of BatteryInfo such that the remaining battery level is equal to or higher than the threshold (High), the remaining battery level is lower than the threshold (Low), or being charged (recharging). Is possible.

[Modification 6]
In the wireless terminal device according to the modification 6, the battery information transmission unit 22 transmits battery information to the wireless base station device 101 according to the remaining amount of the battery.

  FIG. 27 is a flowchart illustrating an operation procedure when the wireless terminal device according to Modification 6 transmits battery information. As shown in FIG. 27, first, the battery state monitoring unit 21 monitors the state of the battery (step S91).

  Next, based on the state of the battery monitored by the battery state monitoring unit 21, the battery information transmission unit 22 determines whether or not the remaining amount of the battery is greater than or equal to a threshold value (step S92).

  When the battery information transmission unit 22 determines that the remaining battery level is equal to or greater than the threshold (Yes in step S92), the battery information transmission unit 22 ends the process without transmitting the battery information. On the other hand, when the battery information transmitting unit 22 determines that the remaining amount of the battery is less than the threshold (No in step S92), the battery information transmitting unit 22 transmits the battery information to the radio base station apparatus 101 (step S93).

  The battery information is also transmitted when the remaining battery level is equal to or greater than the threshold value. When the remaining battery level is less than the threshold value in step S92, the battery information is transmitted more than when the remaining battery level is equal to or greater than the threshold value. Processing that shortens the cycle may be used.

  In the wireless terminal device according to the modified example 6, the battery information transmission unit 22 transmits battery information according to the remaining battery level.

  According to this configuration, the battery information can be transmitted at an appropriate time.

  Further, in the wireless terminal device according to the modified example 6, the battery information transmission unit 22 transmits the battery information when the remaining amount of the battery becomes less than the threshold value.

  According to this configuration, the battery information is transmitted when the remaining battery level is low, that is, when the wireless terminal device 202 is required to perform a power saving operation. it can.

[Modification 7]
In the above embodiment, the operation information determined by the terminal operation determining unit 12 is the measurement cycle in the predetermined measurement operation performed by the wireless terminal device 202. This is the reporting cycle of the predetermined measurement result performed by the wireless terminal device 202. can do.

  In addition, the predetermined measurement result mentioned above can illustrate the measurement result of a radio signal or the measurement result of the state of the wireless terminal device 202. As a specific example of the measurement result of the radio signal, for example, the measurement result of the reception power of the radio signal transmitted from the radio base station apparatus 101 or the measurement result of the reception quality of the radio signal transmitted from the radio base station apparatus 101 is there. As a specific example of the measurement result of the state of the wireless terminal device 202, there is a measurement result of the moving speed of the wireless terminal device 202.

  In the radio base station apparatus according to the modified example 7, when the terminal operation determination unit 12 determines that the remaining battery level of the radio terminal apparatus 202 is less than the threshold based on the information from the battery information acquisition unit 11, for example, the radio terminal The reporting cycle of the measurement report in the device 202 is newly determined. This newly determined reporting cycle is longer than the reporting cycle when the remaining battery level is equal to or greater than the threshold.

  As described above, in the radio base station apparatus according to the modified example 7, the terminal operation determination unit 12 determines a report cycle of a predetermined measurement result performed by the radio terminal apparatus 202 as operation information.

  According to this configuration, it is possible to cause the wireless terminal device 202 to report a predetermined measurement result at an appropriate cycle based on the battery information.

  Further, in the radio base station apparatus according to the modified example 7, the terminal operation determining unit 12 determines the report period so that the report period becomes longer as the remaining battery level of the radio terminal apparatus 202 is smaller.

  According to this configuration, as the remaining battery level is lower, the frequency of reporting the predetermined measurement result by the wireless terminal device 202 can be reduced, so that battery consumption of the wireless terminal device 202 can be suppressed.

DESCRIPTION OF SYMBOLS 11 Battery information acquisition part 12 Terminal operation determination part 13 Handover request part 14 Mode information acquisition part 15 Frequency setting part 21 Battery monitoring part 22 Battery information transmission part 93 Wireless reception part 94 Wireless transmission part 101 Wireless base station apparatus 202 Wireless terminal apparatus

Claims (22)

A transmission / reception unit for transmitting / receiving a radio signal to / from a wireless terminal device;
A battery information acquisition unit for acquiring battery information related to a battery state of the wireless terminal device via the transmission / reception unit;
A radio base station apparatus.   The radio base station apparatus according to claim 1, further comprising: a terminal operation determination unit configured to determine operation information regarding an operation performed in the radio terminal apparatus based on the battery information.   The radio base station apparatus according to claim 2, wherein the terminal operation determining unit determines a report cycle of a predetermined measurement result performed by the radio terminal apparatus as the operation information.   The radio base station apparatus according to claim 3, wherein the terminal operation determining unit determines the reporting cycle so that the reporting cycle becomes longer as a remaining battery level of the radio terminal device is smaller.   The radio base station apparatus according to any one of claims 2 to 4, wherein the terminal operation determination unit determines a measurement cycle in a predetermined measurement operation performed by the radio terminal apparatus as the operation information.   The radio base station apparatus according to claim 5, wherein the terminal operation determining unit determines the measurement cycle so that the measurement cycle becomes longer as the remaining battery level of the radio terminal device decreases. The wireless terminal device acquires a measurement result of a reference signal transmitted to its own wireless base station device, and sets a frequency of a wireless signal transmitted from the wireless terminal device to its own wireless base station device based on the measurement result A frequency setting unit for
The radio base station apparatus according to any one of claims 2 to 6, wherein the terminal operation determining unit determines a transmission cycle of the reference signal as the operation information.   The radio base station apparatus according to claim 7, wherein the terminal operation determination unit determines the transmission cycle so that the transmission cycle becomes longer as the remaining battery level of the radio terminal device decreases.   The terminal operation determining unit is configured to transmit a radio signal from the radio terminal device to a radio base station device based on a relationship between transmission power and power consumption when the radio terminal device transmits a radio signal. Is determined as the operation information, the radio base station apparatus according to any one of claims 2 to 8.   The terminal operation determining unit transmits the radio signal when the ratio of the increase in power consumption of the radio terminal apparatus to the increase in transmission power decreases as the transmission power of the radio signal in the radio terminal apparatus increases. The radio base station apparatus according to claim 9, wherein the resource is determined so that a bandwidth at the time of performing increases.   The terminal operation determining unit transmits the radio signal when a ratio of an increase amount of power consumption of the radio terminal device to an increase amount of the transmission power increases as the transmission power of the radio signal in the radio terminal device increases. The radio base station apparatus according to claim 9, wherein the resource is determined so as to reduce a bandwidth at the time. The radio terminal apparatus communicates with the radio base station apparatus based on communication control information received from the radio base station apparatus, and cycles an on period in which the communication control information is monitored and an off period in which the communication control information is not monitored. It is possible to perform intermittent monitoring operation that repeats automatically,
The radio base station apparatus according to any one of claims 2 to 11, wherein the terminal operation determination unit determines a period of the intermittent monitor operation of the radio terminal apparatus as the operation information.   The radio base station apparatus according to claim 12, wherein the terminal operation determination unit determines the cycle of the intermittent monitor operation so that the cycle of the intermittent monitor operation becomes longer as the remaining battery level of the radio terminal device decreases.   The radio base according to any one of claims 2 to 13, wherein the terminal operation determining unit does not determine the operation information when the battery information indicates that the state of the battery is being charged. Station equipment. The wireless terminal device can select a power saving mode for performing power saving operation and a normal mode for not performing power saving operation,
The radio base station device further includes:
The mode information acquisition unit for acquiring mode information indicating which of the power saving mode and the normal mode is selected by the wireless terminal device according to any one of claims 1 to 14. Wireless base station equipment.   The radio base station apparatus according to claim 15, wherein the terminal operation determining unit determines the operation information when the mode information indicates that the radio terminal apparatus has selected the power saving mode. The radio terminal device transmits reception power information indicating a measurement result of radio signal reception power from the radio base station device to the radio base station device,
The radio base station apparatus according to any one of claims 1 to 16, wherein the battery information acquisition unit acquires the battery information included in the received power information.   18. The wireless communication apparatus according to claim 1, further comprising a handover request unit configured to transmit a handover request including the battery information to a handover destination radio base station apparatus when a handover operation of the radio terminal apparatus is performed. The radio base station apparatus according to the item. A wireless terminal device for transmitting and receiving wireless signals to and from a wireless base station device,
A battery state monitoring unit for monitoring the state of the battery in its own wireless terminal device;
A battery information transmission unit for transmitting battery information related to the state of the battery to the wireless base station device;
A wireless terminal device.   The wireless terminal device according to claim 19, wherein the battery information transmission unit transmits the battery information according to a remaining amount of the battery. Receiving a wireless signal from the wireless terminal device; and
Obtaining battery information relating to the battery state of the wireless terminal device from the wireless signal received in the receiving step;
Including a communication control method. A communication control method in a radio terminal apparatus for transmitting and receiving radio signals to and from a radio base station apparatus,
Monitoring the state of the battery in its own wireless terminal device;
Transmitting battery information relating to the state of the battery to a wireless base station device forming a cell in which the wireless terminal device is located;
Including a communication control method.

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