JP4991117B2 - Wireless communication terminal - Google Patents

Wireless communication terminal Download PDF

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JP4991117B2
JP4991117B2 JP2005057153A JP2005057153A JP4991117B2 JP 4991117 B2 JP4991117 B2 JP 4991117B2 JP 2005057153 A JP2005057153 A JP 2005057153A JP 2005057153 A JP2005057153 A JP 2005057153A JP 4991117 B2 JP4991117 B2 JP 4991117B2
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temperature
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wireless communication
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JP2006245862A (en
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慶介 大関
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    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02D—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN INFORMATION AND COMMUNICATION TECHNOLOGIES [ICT], I.E. INFORMATION AND COMMUNICATION TECHNOLOGIES AIMING AT THE REDUCTION OF THEIR OWN ENERGY USE
    • Y02D30/00—Reducing energy consumption in communication networks
    • Y02D30/70—Reducing energy consumption in communication networks in wireless communication networks

Description

本発明は無線通信端末に係り、特に複数の送信モードを有し、その中から選択した送信モードで動作する無線通信端末に関する。   The present invention relates to a wireless communication terminal, and more particularly, to a wireless communication terminal having a plurality of transmission modes and operating in a transmission mode selected from them.

ＧＰＲＳ（General Packet Radio Service）／ＥＧＰＲＳ(Enhanced General Packet Radio Service)等に代表される無線通信端末では、単位フレーム中の送信スロット数の多重化や送信信号の変調方式を変化させることにより、送信データレートを高速化する手法が用いられている。しかし、この手法では、高速時に消費電流が大きくなることにより、無線通信端末の温度上昇が生じる、電池消費が早くなる等の問題がある。   Wireless communication terminals represented by GPRS (General Packet Radio Service) / EGPRS (Enhanced General Packet Radio Service), etc., transmit data by multiplexing the number of transmission slots in a unit frame and changing the modulation method of the transmission signal. A technique for increasing the rate is used. However, this method has problems such as an increase in temperature of the wireless communication terminal due to an increase in current consumption at high speeds and an increase in battery consumption.

そこで、従来から温度上昇を低減する機能を備えた無線通信端末が知られている（例えば、特許文献１〜３参照）。すなわち、特許文献１記載の従来の無線通信端末では、連続送信時間を制限し、制限時間経過後に送信出力を減衰した状態で送信を行い、温度センサが一定の温度を越えた場合に送信出力を停止する構成である。   Therefore, conventionally, wireless communication terminals having a function of reducing temperature rise are known (see, for example, Patent Documents 1 to 3). That is, the conventional wireless communication terminal described in Patent Document 1 limits the continuous transmission time, performs transmission with the transmission output attenuated after the time limit has elapsed, and outputs the transmission output when the temperature sensor exceeds a certain temperature. It is the structure which stops.

また、特許文献２記載の従来の無線通信端末は、送信信号を増幅するＰＡモジュールが高温になり、増幅能力が低下した場合は、ＰＡモジュールのゲート電圧の絶対値を高くしてＰＡモジュールの電流量を抑制するようにした構成である。更に、特許文献３には、移動局の温度制御を実行するための温度測定機器を設け、温度がしきい値を超えている場合には伝送速度を減少させる移動局が開示されている。   Further, in the conventional wireless communication terminal described in Patent Document 2, when the PA module that amplifies the transmission signal becomes high temperature and the amplification capability is reduced, the absolute value of the gate voltage of the PA module is increased to increase the current of the PA module. In this configuration, the amount is suppressed. Further, Patent Document 3 discloses a mobile station that is provided with a temperature measuring device for performing temperature control of the mobile station, and reduces the transmission rate when the temperature exceeds a threshold value.

特開２００３−３０９４７３号公報（第２−３頁）JP 2003-309473 A (page 2-3) 特開平８−２０４５８７号公報（第５−７頁、第１２頁）JP-A-8-204587 (pages 5-7 and 12) 特表２００２−５３１０２３号公報（第１７頁）Japanese translation of PCT publication No. 2002-531023 (page 17)

しかるに、上記の特許文献１記載の従来の無線通信端末は、端末内の温度としきい値電圧との比較結果に応じて、送信電力を制御するか送信停止するものであり、また、特許文献２記載の従来の無線通信端末は、ＰＡモジュールのゲート電圧を制御するものであり、送信モードを切り替えて温度を低下させる構成ではない。また、特許文献３記載の従来の無線通信端末は、１フレームで受信及び／又は送信される最大のタイムスロット数のうち、送信スロットと受信スロットの比を替えて伝送速度を減少させるものであり、送信モードを切り替えるものではない。   However, the conventional wireless communication terminal described in Patent Document 1 controls transmission power or stops transmission according to the comparison result between the temperature in the terminal and the threshold voltage. The conventional wireless communication terminal described is for controlling the gate voltage of the PA module and is not configured to switch the transmission mode to lower the temperature. In addition, the conventional wireless communication terminal described in Patent Document 3 reduces the transmission rate by changing the ratio between the transmission slot and the reception slot out of the maximum number of time slots received and / or transmitted in one frame. It does not switch the transmission mode.

本発明は上記の点に鑑みなされたもので、複数の送信モードを有し、さらに端末温度、電池電圧等のハードウェア状態をモニタし、そのモニタ結果に応じて複数の送信モードのうちの一の送信モードに切り替え制御を行うことにより、ハードウェア状態により最適な送信モードで動作する無線通信端末を提供することを目的とする。   The present invention has been made in view of the above points, has a plurality of transmission modes, further monitors the hardware state such as terminal temperature and battery voltage, and selects one of the plurality of transmission modes according to the monitoring result. An object of the present invention is to provide a wireless communication terminal that operates in an optimal transmission mode depending on the hardware state by performing switching control to the transmission mode.

上記の目的を達成するため、本発明は単位フレーム中の送信スロット数の多重化及び送信信号の変調方式の切り替えが可能なノーマルモードと、単位フレーム中の送信スロット数の多重化及び送信信号の変調方式の切り替えが不可で固定の変調方式で送信を行う送信制御モードとのうち、送信データレートが高速である方のノーマルモードで動作を開始後、送信制御モードに切替可能な無線通信端末において、端末内部の端末温度を検出する温度検出手段と、ノーマルモードでの動作中に温度検出手段により検出された端末温度をモニタし、端末温度が予め設定した第１の設定温度より高くなったときは送信制御モードに切り替え、送信制御モードでの動作中に温度検出手段により検出された端末温度をモニタし、端末温度が第１の設定温度よりも低い予め設定した第２の設定温度以下となったとき、ノーマルモードに切り替える送信モード切り替え手段とを有することを特徴とする。 In order to achieve the above object, the present invention provides a normal mode in which the number of transmission slots in a unit frame can be multiplexed and the modulation scheme of a transmission signal can be switched, and the number of transmission slots in a unit frame can be multiplexed and a transmission signal can be changed. In a radio communication terminal capable of switching to the transmission control mode after starting the operation in the normal mode with the higher transmission data rate among the transmission control modes in which the modulation method cannot be switched and the transmission is performed with the fixed modulation method . When the terminal temperature detected by the temperature detecting means for detecting the terminal temperature inside the terminal and the temperature detecting means during operation in the normal mode is monitored, and the terminal temperature becomes higher than the preset first set temperature switching to the transmission control mode monitors the terminal temperature detected by the temperature detection means during operation in the transmission control mode, the terminal temperature first set temperature When it becomes less than the second set temperature set remote low advance, and having a transmission mode switching means for switching to the normal mode.

この発明では、ノーマルモードの方が送信制御モードに比べて送信データレートが高速であるため、消費電流が多くてノーマルモードで動作中の端末の内部温度（端末温度）が時間の経過と共に上昇するのに対し、送信制御モードでは送信データレートが低速であり消費電流が少なく、送信制御モードで動作中は端末温度が時間の経過と共に低下することに鑑み、初期状態では高速な伝送速度を確保するためにノーマルモードとし、そのノーマルモードでの動作中に端末温度が第１の設定温度より高くなったときは送信制御モードに切り替えることで端末温度を低下させて端末の発熱を抑え、その送信制御モードでの動作中に端末温度が第２の設定温度以下となったときは、ノーマルモードに切り替えることで高速な送信データレートでの動作を可能とすることができる。 In the present invention, the normal mode has a higher transmission data rate than the transmission control mode, so that the current consumption increases and the internal temperature (terminal temperature) of the terminal operating in the normal mode increases with time. On the other hand, in the transmission control mode, the transmission data rate is low and current consumption is small, and in the initial state, a high transmission speed is ensured in view of the fact that the terminal temperature decreases with time while operating in the transmission control mode. a normal mode in order, then the terminal temperature during operation in the normal mode is higher than the first set temperature reduces the terminal temperature by switching to the transmission control mode suppressing heat generation of the terminal, the transmission control dynamic terminal temperatures during operation in the mode is when it becomes less than the second set temperature, the high-speed transmission data rates by switching to the normal mode It is possible to enable the.

また、上記の目的を達成するため、本発明は、電池を電源とし、単位フレーム中の送信スロット数の多重化及び送信信号の変調方式の切り替えが可能なノーマルモードと、単位フレーム中の送信スロット数の多重化及び送信信号の変調方式の切り替えが不可で固定の変調方式で送信を行う送信制御モードとのうち、送信データレートが高速である方のノーマルモードで動作を開始後、送信制御モードに切替可能な無線通信端末において、端末内部の端末温度を検出する温度検出手段と、電池の電池電圧を検出する電池電圧検出手段と、ノーマルモードでの動作中に、温度検出手段により検出された端末温度と電池電圧検出手段により検出された電池電圧をそれぞれモニタし、端末温度が予め設定した第１の設定温度より高くなったとき、又は電池電圧が予め設定した設定値より低下したとき、ノーマルモードから送信制御モードに切り替える第１の送信モード切り替え手段と、送信制御モードでの動作中に温度検出手段により検出された端末温度をモニタし、端末温度が第１の設定温度よりも低い予め設定した第２の設定温度以下となったとき、ノーマルモードに切り替える第２の送信モード切り替え手段とを有することを特徴とする。この発明では、端末温度と電池電圧の両方に基づいて、送信モードを切り替えることができる。In order to achieve the above object, the present invention provides a normal mode in which a battery is used as a power source, the number of transmission slots in a unit frame can be multiplexed, and the modulation method of a transmission signal can be switched. Transmission control mode after starting operation in normal mode with the higher transmission data rate among transmission control modes in which transmission of a fixed modulation method is impossible and switching of the number of modulation and transmission signal modulation method is impossible In the wireless communication terminal that can be switched to, the temperature detection means for detecting the terminal temperature inside the terminal, the battery voltage detection means for detecting the battery voltage of the battery, and detected by the temperature detection means during operation in the normal mode When the terminal temperature and the battery voltage detected by the battery voltage detecting means are respectively monitored and the terminal temperature becomes higher than the first set temperature set in advance, or When the battery voltage falls below a preset value, the first transmission mode switching means for switching from the normal mode to the transmission control mode and the terminal temperature detected by the temperature detection means during operation in the transmission control mode are monitored. And a second transmission mode switching means for switching to the normal mode when the terminal temperature becomes equal to or lower than a second preset temperature lower than the first preset temperature. In the present invention, the transmission mode can be switched based on both the terminal temperature and the battery voltage.

本発明によれば、単位フレーム中の送信スロット数の多重化及び送信信号の変調方式の切り替えが可能なノーマルモードと、単位フレーム中の送信スロット数の多重化及び送信信号の変調方式の切り替えが不可で固定の変調方式で送信を行う送信制御モードとのうち、送信データレートが高速である方のノーマルモードで動作を開始後、送信制御モードに切替可能な無線通信端末において、端末温度又は電池電圧に応じて送信モードを切替えるようにしたため、無線通信端末の温度上昇又は電池消費を抑制し、ハードウェア状態により最適な送信モードを選択することができる。 According to the present invention, the normal mode in which the number of transmission slots in a unit frame can be multiplexed and the modulation scheme of the transmission signal can be switched, and the number of transmission slots in the unit frame and the modulation scheme of the transmission signal can be switched. In a wireless communication terminal capable of switching to the transmission control mode after starting the operation in the normal mode with the higher transmission data rate among the transmission control modes in which transmission is impossible and in a fixed modulation scheme , the terminal temperature or the battery Since the transmission mode is switched according to the voltage, the temperature increase or battery consumption of the wireless communication terminal can be suppressed, and the optimal transmission mode can be selected depending on the hardware state.

次に、本発明の実施の形態について図面と共に説明する。図１は本発明になる無線通信端末の一実施の形態のブロック図を示す。同図に示すように、この無線通信端末１００は、最寄りの無線基地局（図示せず）との間で無線通信する無線部１０１と、無線部１０１で送受信する信号を処理するベースバンド部１０２と、この無線通信端末の全体を統括的に制御する制御部１０３と、端末内部の温度を検出する温度センサ１０４と、電池１０６の電圧値を検出する電池電圧センサ１０５とから構成され、電池１０６の電源供給により動作する。   Next, embodiments of the present invention will be described with reference to the drawings. FIG. 1 is a block diagram showing an embodiment of a wireless communication terminal according to the present invention. As shown in the figure, the radio communication terminal 100 includes a radio unit 101 that performs radio communication with the nearest radio base station (not shown), and a baseband unit 102 that processes signals transmitted and received by the radio unit 101. And a control unit 103 that performs overall control of the entire wireless communication terminal, a temperature sensor 104 that detects the temperature inside the terminal, and a battery voltage sensor 105 that detects the voltage value of the battery 106. It operates by supplying power.

無線部１０１は、制御部１０３の制御に従い、ベースバンド部１０２から入力される信号を無線基地局に送信し、無線基地局から送信される信号を検索、受信してベースバンド部１０２に出力する。ベースバンド部１０２は制御部１０３の指定するデータのベースバンド処理を行った後に無線部１０１に出力し、無線部１０１から入力される信号のベースバンド処理を行う。制御部１０３は無線部１０１及びベースバンド部１０２の制御を行う。   The radio unit 101 transmits a signal input from the baseband unit 102 to the radio base station under the control of the control unit 103, searches for and receives a signal transmitted from the radio base station, and outputs the signal to the baseband unit 102 . The baseband unit 102 performs baseband processing of data specified by the control unit 103 and then outputs the data to the wireless unit 101, and performs baseband processing of a signal input from the wireless unit 101. The control unit 103 controls the wireless unit 101 and the baseband unit 102.

温度センサ１０４は無線通信端末１００内の温度をモニタし（検出し）、その検出温度を制御部１０３に出力する。電池電圧センサ１０５は電池１０６の電池電圧をモニタし（検出し）、その検出値を制御部１０３に出力する。   The temperature sensor 104 monitors (detects) the temperature in the wireless communication terminal 100 and outputs the detected temperature to the control unit 103. The battery voltage sensor 105 monitors (detects) the battery voltage of the battery 106 and outputs the detected value to the control unit 103.

次に、本実施の形態の無線通信端末１００が動作可能な送信モードについて、図２と共に説明する。図２において、送信モードの「ノーマル」は、送信スロット（Ｓｌｏｔ）の多重化と変調方式の切替が可能であり、送信データレートは高速であるが、消費電流が大きい。この送信モード「ノーマル」のＧＰＲＳ／ＥＧＰＲＳでの例として、ＥＧＰＲＳ Ｃｌａｓｓ１０の端末があげられる。この端末は、最大送信スロット数が２で、変調方式は、ＧＭＳＫと８ＰＳＫの切替が可能である。   Next, a transmission mode in which radio communication terminal 100 according to the present embodiment can operate will be described with reference to FIG. In FIG. 2, “normal” in the transmission mode allows multiplexing of transmission slots (Slots) and switching of the modulation method, and the transmission data rate is high, but the current consumption is large. An example of GPRS / EGPRS in this transmission mode “normal” is an EGPRS Class 10 terminal. In this terminal, the maximum number of transmission slots is 2, and the modulation scheme can be switched between GMSK and 8PSK.

また、送信モードの「送信制御モード」は、図２に示すように、送信スロット（Ｓｌｏｔ）の多重化と変調方式の切替がいずれも不可であり、送信データレートは低速であるが消費電流は少ない。この送信モード「送信制御モード」のＧＰＲＳ／ＥＧＰＲＳでの例としては、ＧＰＲＳ Ｃｌａｓｓ８の端末があげられる。この端末は、最大送信スロット数が１であり、変調方式はＧＭＳＫのみである。   In addition, as shown in FIG. 2, in the transmission mode “transmission control mode”, neither multiplexing of transmission slots (Slot) nor switching of the modulation method is possible, the transmission data rate is low, but the current consumption is low. Few. An example of GPRS / EGPRS in this transmission mode “transmission control mode” is a GPRS Class 8 terminal. In this terminal, the maximum number of transmission slots is 1, and the modulation scheme is only GMSK.

次に、図２の２つの送信モードを備えた図１の実施の形態の動作について、図３のフローチャートを併せ参照して説明する。図１の制御部１０３は、初期状態では送信モード「ノーマル」で動作開始するように端末を制御し（図３のステップＳ１）、この送信モード「ノーマル」での動作中において、温度センサ１０４で検出された端末内の温度（端末温度）をモニタし（図３のステップＳ２）。検出した端末温度が一定温度Ａより高いか否か判定する（図３のステップＳ３）。   Next, the operation of the embodiment of FIG. 1 having the two transmission modes of FIG. 2 will be described with reference to the flowchart of FIG. The control unit 103 in FIG. 1 controls the terminal to start operation in the transmission mode “normal” in the initial state (step S1 in FIG. 3). During operation in the transmission mode “normal”, the temperature sensor 104 The detected temperature in the terminal (terminal temperature) is monitored (step S2 in FIG. 3). It is determined whether or not the detected terminal temperature is higher than a certain temperature A (step S3 in FIG. 3).

制御部１０３は、検出した端末温度が一定温度Ａ以下であるとステップＳ３で判定した場合は、引き続き送信モード「ノーマル」で高速な伝送速度で動作すると共に、温度センサ１０４で検出された端末温度が一定温度Ａより高くなったかどうかを監視している（ステップＳ１〜Ｓ３）。   When it is determined in step S3 that the detected terminal temperature is equal to or lower than the constant temperature A, the control unit 103 continues to operate at a high transmission rate in the transmission mode “normal” and the terminal temperature detected by the temperature sensor 104. It is monitored whether or not has become higher than a certain temperature A (steps S1 to S3).

送信モード「ノーマル」では高速な伝送速度を確保できる反面、消費電流が大きいため、動作時間が長くなるほど、端末の発熱や電池消費が大きくなる傾向にある。このため、動作時間が長くなると、温度センサ１０４で検出された端末温度が一定温度Ａより高くなる。制御部１０３は、ステップＳ３で端末温度が一定温度Ａより高くなったと判定すると、送信モードをそれまでの「ノーマル」から「送信制御モード」に切替える（図３のステップＳ４）。   In the transmission mode “normal”, a high transmission speed can be secured, but since the current consumption is large, the heat generation of the terminal and the battery consumption tend to increase as the operation time increases. For this reason, if the operating time is lengthened, the terminal temperature detected by the temperature sensor 104 becomes higher than the constant temperature A. When determining that the terminal temperature has become higher than the constant temperature A in step S3, the control unit 103 switches the transmission mode from “normal” until then to “transmission control mode” (step S4 in FIG. 3).

制御部１０３は、「送信制御モード」に切り替えると、温度センサ１０４で検出された端末温度が一定温度Ｂ（＜Ａ）以下になったかどうかを監視する（図３のステップＳ５）。送信モード「送信制御モード」は、送信データレートは低速であるが、消費電流が少ないため、無線通信端末１００の端末温度の上昇を抑制することができ、動作時間が長くなると端末温度が低下する傾向にある。そこで、前記一定温度Ａよりも低い所定の一定温度Ｂを設定し、制御部１０３は、端末温度が一定温度Ｂ以下に低下するまでは、「送信制御モード」で無線通信端末１００を動作させる（図３のステップＳ５、Ｓ６）。   When switching to the “transmission control mode”, the control unit 103 monitors whether or not the terminal temperature detected by the temperature sensor 104 has become equal to or lower than a certain temperature B (<A) (step S5 in FIG. 3). In the transmission mode “transmission control mode”, although the transmission data rate is low, the current consumption is small, so that an increase in the terminal temperature of the wireless communication terminal 100 can be suppressed, and the terminal temperature decreases as the operation time increases. There is a tendency. Therefore, a predetermined constant temperature B lower than the constant temperature A is set, and the control unit 103 operates the wireless communication terminal 100 in the “transmission control mode” until the terminal temperature drops below the constant temperature B ( Steps S5 and S6 in FIG.

制御部１０３は、ステップＳ６で端末温度が一定温度Ｂ以下になったと判定すると、再び送信モードを「ノーマル」に切り替える（図３のステップＳ７）。その後、再びステップＳ２以降の動作が、動作終了まで繰り返される。   When determining that the terminal temperature has become equal to or lower than the constant temperature B in step S6, the control unit 103 switches the transmission mode to “normal” again (step S7 in FIG. 3). Thereafter, the operation after step S2 is repeated until the operation is completed.

図４は無線通信端末１００の端末温度の変遷の一例のグラフを示す。同図において、区間Ｔ１においては無線通信端末１００は送信モード「ノーマル」で動作しており、端末温度が上昇傾向にある。無線通信端末１００は端末温度が一定温度Ａを超えたことを検出すると、送信モードを「送信制御モード」に切替える。「送信制御モード」で動作している区間Ｔ２においては、無線通信端末１００は端末温度が下降傾向にある。「送信制御モード」で動作している無線通信端末１００は、端末温度が一定温度Ｂ以下になったことを検出すると、再び送信モードを「ノーマル」に切替え、区間Ｔ３では送信モード「ノーマル」で動作する。   FIG. 4 shows a graph of an example of changes in the terminal temperature of the wireless communication terminal 100. In the figure, in the section T1, the wireless communication terminal 100 operates in the transmission mode “normal”, and the terminal temperature tends to rise. When the wireless communication terminal 100 detects that the terminal temperature exceeds a certain temperature A, the wireless communication terminal 100 switches the transmission mode to the “transmission control mode”. In the section T2 operating in the “transmission control mode”, the terminal temperature of the wireless communication terminal 100 tends to decrease. When the wireless communication terminal 100 operating in the “transmission control mode” detects that the terminal temperature has become equal to or lower than the predetermined temperature B, the wireless communication terminal 100 switches the transmission mode to “normal” again. Operate.

このように、本実施の形態の無線通信端末１００は、動作開始以降、送信モードを「ノーマル」として、端末温度が一定温度Ａを超えるまでは高速な伝送速度で動作し、端末温度が一定温度Ａを超えると、送信モードを「送信制御モード」に切り替え、端末温度の上昇を抑制し、この送信制御モードで端末温度が一定温度Ｂ以下にまで低下すると再び送信モードを高速な「ノーマル」に切り替えるようにしたため、端末温度に応じた最適な送信モードを選択して、最適な動作をさせることができる。   As described above, the wireless communication terminal 100 according to the present embodiment operates at a high transmission rate until the terminal temperature exceeds the constant temperature A after the operation starts, with the transmission mode set to “normal”, and the terminal temperature is constant temperature. When A is exceeded, the transmission mode is switched to the “transmission control mode” to suppress the increase in the terminal temperature, and when the terminal temperature falls below a certain temperature B in this transmission control mode, the transmission mode is changed to the high speed “normal” again. Since switching is performed, it is possible to select an optimal transmission mode according to the terminal temperature and perform an optimal operation.

次に、本発明の他の実施の形態について説明する。この実施の形態は、基本的な構成は、図１と同じであり、また送信モードも図２に示した２つの送信モードの切替が可能な構成であるが、上記の実施の形態では端末温度をモニタしていたのに対し、この実施の形態では電池電圧をモニタし送信手段を選択する点に特徴がある。   Next, another embodiment of the present invention will be described. In this embodiment, the basic configuration is the same as that in FIG. 1, and the transmission mode can be switched between the two transmission modes shown in FIG. 2, but in the above embodiment, the terminal temperature is However, this embodiment is characterized in that the battery voltage is monitored and the transmission means is selected.

図１において、制御部１０３は電池電圧センサ１０５で検出された電池１０６の電池電圧をモニタし、モニタした電池電圧が一定電圧Ｃに達するまでは送信モード「ノーマル」で動作する。送信モード「ノーマル」は送信データレートは高速であるが、消費電流が大きいため電池１０６の電池電圧消費が大きい傾向がある。従って、動作時間が長くなるほど、電池電圧が低下していく。   In FIG. 1, the control unit 103 monitors the battery voltage of the battery 106 detected by the battery voltage sensor 105 and operates in the transmission mode “normal” until the monitored battery voltage reaches a certain voltage C. In the transmission mode “normal”, the transmission data rate is high, but since the current consumption is large, the battery voltage consumption of the battery 106 tends to be large. Therefore, the battery voltage decreases as the operation time becomes longer.

制御部１０３は、電池電圧センサ１０５から供給されるモニタ電池電圧が、上記の一定電圧Ｃを下回ったことを検出すると、送信モードを「ノーマル」から「送信制御モード」に切替える。送信モード「送信制御モード」は送信データレートは低速であるが、消費電流が少ないため電池１０６の電池消費を抑制することができる。従って、「送信制御モード」では、「ノーマル」に比べて電池電圧の低下の割合が少なくなる。これにより、電池１０６を従来に比べてより長時間使用することができる。   When the control unit 103 detects that the monitor battery voltage supplied from the battery voltage sensor 105 is lower than the constant voltage C, the control unit 103 switches the transmission mode from “normal” to “transmission control mode”. In the transmission mode “transmission control mode”, the transmission data rate is low, but since the current consumption is small, the battery consumption of the battery 106 can be suppressed. Therefore, in the “transmission control mode”, the rate of decrease in the battery voltage is smaller than that in “normal”. Thereby, the battery 106 can be used for a longer time than in the past.

図５は無線通信端末１００の電池電圧の変遷の一例のグラフを示す。図５において、区間Ｔ４においては無線通信端末１００は高速な伝送速度の送信モード「ノーマル」で動作しており、電池電圧は時間の経過と共に低下していく。無線通信端末１００は電池電圧が一定電圧Ｃを下回ったことを検出すると、送信モードを「送信制御モード」に切替える（区間Ｔ４→区間Ｔ５）。低速な伝送速度の「送信制御モード」で動作している区間Ｔ５においては、無線通信端末１００の電池電圧は送信モード「ノーマル」で動作している区間Ｔ４に比べて、緩やかな傾斜で低下していく。   FIG. 5 shows a graph of an example of changes in the battery voltage of the wireless communication terminal 100. In FIG. 5, in the section T4, the wireless communication terminal 100 operates in the transmission mode “normal” at a high transmission rate, and the battery voltage decreases with the passage of time. When the wireless communication terminal 100 detects that the battery voltage has fallen below the certain voltage C, the wireless communication terminal 100 switches the transmission mode to the “transmission control mode” (section T4 → section T5). In the section T5 operating in the “transmission control mode” at a low transmission speed, the battery voltage of the wireless communication terminal 100 decreases at a gentle slope as compared to the section T4 operating in the transmission mode “normal”. To go.

このようにして、この実施の形態では、制御部１０３が電池電圧センサ１０５で検出された電池１０６の電池電圧をモニタし、電池電圧が一定電圧Ｃを下回ったことを検出すると、送信モードを低速な送信制御モードに切替えることにより、電池１０６の電池消費を抑制し、ハードウェア状態により最適な送信手段を選択することができるという効果が得られる。   Thus, in this embodiment, when the control unit 103 monitors the battery voltage of the battery 106 detected by the battery voltage sensor 105 and detects that the battery voltage has fallen below a certain voltage C, the transmission mode is set to low speed. By switching to the proper transmission control mode, it is possible to suppress the battery consumption of the battery 106 and to obtain an effect that an optimal transmission means can be selected depending on the hardware state.

本発明の一実施の形態のブロック図である。It is a block diagram of one embodiment of the present invention. 本発明における送信モードの一例を示す図である。It is a figure which shows an example of the transmission mode in this invention. 本発明の一実施の形態の動作説明用フローチャートである。It is a flowchart for operation | movement description of one embodiment of this invention. 端末温度の変遷の一例を示すグラフである。It is a graph which shows an example of transition of terminal temperature. 電池電圧変遷の一例を示すグラフである。It is a graph which shows an example of a battery voltage transition.

符号の説明Explanation of symbols

１００ 無線通信端末
１０１ 無線部
１０２ ベースバンド部
１０３ 制御部
１０４ 温度センサ
１０５ 電池電圧センサ
１０６ 電池



DESCRIPTION OF SYMBOLS 100 Wireless communication terminal 101 Radio | wireless part 102 Baseband part 103 Control part 104 Temperature sensor 105 Battery voltage sensor 106 Battery



Claims (2)

単位フレーム中の送信スロット数の多重化及び送信信号の変調方式の切り替えが可能なノーマルモードと、単位フレーム中の送信スロット数の多重化及び送信信号の変調方式の切り替えが不可で固定の変調方式で送信を行う送信制御モードとのうち、送信データレートが高速である方の前記ノーマルモードで動作を開始後、前記送信制御モードに切替可能な無線通信端末において、
端末内部の端末温度を検出する温度検出手段と、
前記ノーマルモードでの動作中に前記温度検出手段により検出された端末温度をモニタし、該端末温度が予め設定した第１の設定温度より高くなったときは前記送信制御モードに切り替え、前記送信制御モードでの動作中に前記温度検出手段により検出された端末温度をモニタし、該端末温度が前記第１の設定温度よりも低い予め設定した第２の設定温度以下となったとき、前記ノーマルモードに切り替える送信モード切り替え手段と
を有することを特徴とする無線通信端末。 A normal mode in which the number of transmission slots in a unit frame can be multiplexed and the modulation scheme of the transmission signal can be switched; In the wireless communication terminal that can be switched to the transmission control mode after starting the operation in the normal mode with the higher transmission data rate among the transmission control modes in which transmission is performed in
Temperature detecting means for detecting the terminal temperature inside the terminal;
The terminal temperature detected by the temperature detecting means during operation in the normal mode is monitored, and when the terminal temperature becomes higher than a preset first set temperature, the transmission control mode is switched to, and the transmission control is performed. The terminal temperature detected by the temperature detecting means during operation in the mode is monitored, and when the terminal temperature becomes equal to or lower than a second preset temperature lower than the first preset temperature, the normal mode Transmission mode switching means for switching to a wireless communication terminal. 電池を電源とし、単位フレーム中の送信スロット数の多重化及び送信信号の変調方式の切り替えが可能なノーマルモードと、単位フレーム中の送信スロット数の多重化及び送信信号の変調方式の切り替えが不可で固定の変調方式で送信を行う送信制御モードとのうち、送信データレートが高速である方の前記ノーマルモードで動作を開始後、前記送信制御モードに切替可能な無線通信端末において、
端末内部の端末温度を検出する温度検出手段と、
前記電池の電池電圧を検出する電池電圧検出手段と、
前記ノーマルモードでの動作中に、前記温度検出手段により検出された端末温度と前記電池電圧検出手段により検出された電池電圧をそれぞれモニタし、該端末温度が予め設定した第１の設定温度より高くなったとき、又は前記電池電圧が予め設定した設定値より低下したとき、前記ノーマルモードから前記送信制御モードに切り替える第１の送信モード切り替え手段と、
前記送信制御モードでの動作中に前記温度検出手段により検出された端末温度をモニタし、該端末温度が前記第１の設定温度よりも低い予め設定した第２の設定温度以下となったとき、前記ノーマルモードに切り替える第２の送信モード切り替え手段と
を有することを特徴とする無線通信端末。 Normal mode, which can multiplex the number of transmission slots in a unit frame and switch the modulation method of the transmission signal with battery as power source, and cannot multiplex the number of transmission slots in a unit frame and switch the modulation method of the transmission signal In the radio communication terminal that can switch to the transmission control mode after starting the operation in the normal mode with the higher transmission data rate among the transmission control modes in which transmission is performed with a fixed modulation method in
Temperature detecting means for detecting the terminal temperature inside the terminal;
Battery voltage detection means for detecting the battery voltage of the battery;
During the operation in the normal mode, the terminal temperature detected by the temperature detecting means and the battery voltage detected by the battery voltage detecting means are monitored, respectively, and the terminal temperature is higher than a preset first set temperature. Or when the battery voltage falls below a preset set value, a first transmission mode switching means for switching from the normal mode to the transmission control mode,
When the terminal temperature detected by the temperature detecting means during operation in the transmission control mode is monitored, and the terminal temperature becomes equal to or lower than a second preset temperature lower than the first preset temperature, And a second transmission mode switching means for switching to the normal mode.
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