JP5168461B2 - TCXO control method and method for reconnection in mobile phone - Google Patents
TCXO control method and method for reconnection in mobile phone Download PDFInfo
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本発明は、携帯電話機における再接続時のＴＣＸＯ(Temperature Compensated Crystal Oscillator)制御方法及びその方式に関する。 The present invention relates to a TCXO (Temperature Compensated Crystal Oscillator) control method and method for reconnection in a mobile phone.
通常動作においてはＡＦＣ(Automatic Frequency Control)機能にて同期を保持できている受信周波数は概ね設計にて想定できる範囲内であるが場合によっては想定範囲外になる場合もある。受信周波数が期待周波数範囲外へずれるとＡＦＣ機能により追従させているＴＣＸＯの設定値も想定の範囲から外れることになる。 In normal operation, the reception frequency that can maintain synchronization by the AFC (Automatic Frequency Control) function is generally within a range that can be assumed by design, but in some cases, it may be outside the expected range. If the reception frequency deviates from the expected frequency range, the setting value of TCXO followed by the AFC function also deviates from the expected range.
受信周波数が期待周波数内にある場合と範囲外にある場合の２つの状態において、シャドウイング(Shadowing)等により発生する一時的な電波劣化状態による電波断状態となった場合、再接続する周波数をＴＣＸＯ等を制御することで検出するが、受信周波数が期待周波数内にあるのか否が不明な場合においても従来の制御では一律設計での期待値をＴＣＸＯに設定していた。このため、受信周波数が期待受信周波数外である場合は再接続に失敗し通信維持を失敗してしまう場合があった。 When the reception frequency is within the expected frequency and out of range, the frequency to be reconnected should the reconnection occur when there is a radio outage due to a temporary radio degradation caused by shadowing etc. Although detection is performed by controlling TCXO or the like, even when it is unclear whether the reception frequency is within the expected frequency, the conventional control sets the expected value in the uniform design to TCXO. For this reason, when the reception frequency is outside the expected reception frequency, reconnection may fail and communication maintenance may fail.
携帯電話機では、通常受信周波数がフェージングなどによりずれるため、ＡＦＣ機能で携帯電話機内部のターゲット周波数をずれた受信周波数に追従させることで通信同期を維持している。 In mobile phones, since the normal reception frequency is shifted due to fading or the like, communication synchronization is maintained by making the target frequency inside the mobile phone follow the shifted reception frequency by the AFC function.
ＡＦＣ機能については例えば特許文献１に記載されている。ここで従来のＡＦＣ機能について図１及び図２を用いて説明する。 The AFC function is described in Patent Document 1, for example. Here, the conventional AFC function will be described with reference to FIGS.
まず、通信時に携帯電話機用アンテナ（１−１）から入力した受信電波は無線部（１−２）内部の周波数発生部（１−３）で生成されたターゲット周波数を用いて、受信データに変換され、制御部（１−４）に送られる。この周波数発生部（１−３）はＴＣＸＯ（１−７）、即ち温度補償型の水晶発振器からの出力周波数を元にターゲット周波数を発生する。その後、ＡＦＣ制御部（１−６）では制御部（１−４）で受信したデータを元に周波数発生部（１−３）から出力しているターゲット周波数と受信電波周波数のずれを検出する。そして周波数ずれが少なくなるようにＴＣＸＯ（１−７）出力周波数を補正することで、ＴＣＸＯ（１−７）出力周波数を元にしている周波数発生部（１−３）のターゲット周波数を変化させる。上記制御によりターゲット周波数と受信電波周波数を同期させて通信を維持する。
通常動作においてはＡＦＣ機能にて同期を保持できている受信周波数は概ね設計にて想定できる範囲内であるが場合によっては想定範囲外になる場合もある。これは無線通信においては電波の反射、遅延などにより発生するフェージングなどの影響、外来ノイズにより受信電波周波数がずれる場合などに発生する。受信周波数が期待周波数範囲外へずれるとＡＦＣ機能により追従させているＴＣＸＯの設定値も想定の範囲から外れることになる。 In normal operation, the reception frequency at which synchronization can be maintained by the AFC function is generally within a range that can be assumed by design, but may be outside the expected range depending on the case. This occurs in wireless communication due to the influence of fading or the like caused by reflection or delay of radio waves, or when the received radio wave frequency shifts due to external noise. If the reception frequency deviates from the expected frequency range, the setting value of TCXO followed by the AFC function also deviates from the expected range.
受信周波数が期待周波数内にある場合と範囲外にある場合の２つの状態において、例えば移動中にビルなどが通信路内に入ることで発生するシャドウイングにより発生する一時的な電波劣化状態による電波断状態となった場合、再接続する周波数をＴＣＸＯ等を制御することで検出するが、受信周波数が期待周波数内にあるのか否かが不明な場合においても従来の制御では一律設計での期待値をＴＣＸＯに設定していた。 In two states, when the received frequency is within the expected frequency and when it is out of range, for example, radio waves due to a temporary radio wave degradation caused by shadowing that occurs when a building or the like enters the communication path while moving In the case of a disconnection state, the reconnection frequency is detected by controlling the TCXO, etc., but even if it is unclear whether the reception frequency is within the expected frequency, the conventional control expects a uniform design value. Was set to TCXO.
このため、受信周波数が期待受信周波数外である場合は再接続に失敗し通信維持を失敗してしまう場合があった。 For this reason, when the reception frequency is outside the expected reception frequency, reconnection may fail and communication maintenance may fail.
図２、図３及び図４を参照して従来の動作を説明する。 The conventional operation will be described with reference to FIG. 2, FIG. 3 and FIG.
図２は従来の再接続状態での処理フローを示している。 FIG. 2 shows a processing flow in a conventional reconnection state.
再接続状態に遷移（２−１）すると、まずＴＣＸＯの発振周波数を設計値に設定する（２−２）。その後、再接続検索処理に遷移する（２−３）。再接続検出処理ではＣＰＵ（１−８）（図１）から制御部（１−４）（図１）に命令を発行し、再接続処理を実行する。制御部（１−４）が一定時間通信相手を検索し再接続先を検出する。ここで再接続先（ｎ）が１以上検出できれば（２−５でＮＯ）再接続は成功（２−７）であるが、再接続先が見つからなければ（２−５でＹＥＳ）、再度２−２に戻り検索を繰り返す。 When transitioning to the reconnection state (2-1), first, the TCXO oscillation frequency is set to a design value (2-2). Then, the process proceeds to reconnection search processing (2-3). In the reconnection detection process, an instruction is issued from the CPU (1-8) (FIG. 1) to the control unit (1-4) (FIG. 1) to execute the reconnection process. The control unit (1-4) searches for a communication partner for a certain period of time and detects a reconnection destination. If one or more reconnection destinations (n) can be detected (NO in 2-5), the reconnection is successful (2-7), but if no reconnection destination is found (YES in 2-5), 2 again. Return to -2 and repeat search.
図３及び図４は上記処理フローを基に記載したものである。 3 and 4 are described based on the above processing flow.
図３は受信周波数が期待受信周波数範囲外へずれた場合を図示している。 FIG. 3 illustrates a case where the reception frequency is shifted outside the expected reception frequency range.
通信中に受信周波数が期待受信周波数範囲外へずれ、受信周波数とターゲット周波数の周波数差分が大きくなっている（３−１）。周波数差分が大きくなったので差分が少なくなるようにＴＣＸＯを制御した結果、ＴＣＸＯ設定値（３−２）が期待受信周波数検出可能範囲外になる。その後再接続状態に遷移し、ＴＣＸＯを設計値にて設定している。だが、周波数差分（３−１）は変化がない（つまり受信周波数は期待受信周波数外にある）ため結果的には再接続は失敗してしまうことになる。 During communication, the reception frequency deviates outside the expected reception frequency range, and the frequency difference between the reception frequency and the target frequency is large (3-1). As the frequency difference is increased, the TCXO is controlled so that the difference is reduced. As a result, the TCXO set value (3-2) falls outside the expected reception frequency detectable range. After that, the state transits to the reconnection state, and TCXO is set as a design value. However, since the frequency difference (3-1) does not change (that is, the reception frequency is outside the expected reception frequency), reconnection fails as a result.
図４は図３とは逆で受信周波数が期待受信周波数範囲内にある場合を図示している。 FIG. 4 illustrates the case where the reception frequency is in the expected reception frequency range, which is the reverse of FIG.
受信周波数は期待受信周波数範囲内にあり周波数差分は発生していない（４−１）。結果としてＴＣＸＯ設定も期待受信周波数範囲検出可能領域内になる（４−２）。この状態で再接続状態に遷移したとすると再接続は成功することになる。 The reception frequency is within the expected reception frequency range, and no frequency difference is generated (4-1). As a result, the TCXO setting is also within the expected reception frequency range detectable region (4-2). If the state transitions to the reconnection state in this state, the reconnection will be successful.
そこで、本発明は、携帯電話機における再接続時のＴＣＸＯ制御方法において、再接続成功の確率を上げることを目的とする。 Accordingly, an object of the present invention is to increase the probability of successful reconnection in a TCXO control method during reconnection in a mobile phone.
本発明によれば、携帯電話機における再接続時のＴＣＸＯ制御方法であって、予め定められた期待周波数範囲外に受信周波数が該当する場合に、再接続検索処理回数が第１の所定回数を超えるまでは、前記期待周波数範囲外に属する値であって電波断状態に遷移する直近に使用されていたＴＣＸＯ値を用いて再接続を試みるものとし、再接続検索処理回数が前記第１の所定回数を超えても再接続に成功しない場合に、ＴＣＸＯの設定値を設計値に再設定してから、再接続検索処理を再度試みることを特徴とするＴＣＸＯ制御方法が提供される。
According to the present invention, there is provided a TCXO control method at the time of reconnection in a mobile phone, and when the received frequency falls outside a predetermined expected frequency range, the number of reconnection search processes exceeds a first predetermined number of times. Until this time, it is assumed that reconnection is attempted using the TCXO value that is a value that belongs to the outside of the expected frequency range and has been used most recently to transit to the radio wave interruption state. If the reconnection is not successful even if the value exceeds TCXO, a TCXO control method is provided in which the setting value of the TCXO is reset to the design value and then the reconnection search process is retried.
上記のＴＣＸＯ制御方法において、再接続検索処理回数が前記第１の所定回数よりも少ない第２の所定回数を超えても再接続に成功しない場合に、ＴＣＸＯの設定値を基地局と携帯電話機との間の通信の周波数が同期していた時の値に再設定してから、再接続検索処理を再度試みるようにしてもよい。 In the above TCXO control method, if reconnection is not successful even if the number of reconnection search processes exceeds a second predetermined number less than the first predetermined number, the setting value of TCXO is set to the base station and the mobile phone. It is also possible to re-attempt the reconnection search process after resetting the value to the value when the communication frequency is synchronized.
上記のＴＣＸＯ制御方法において、基地局と携帯電話機との間の通信の周波数が同期している時にその周波数を記憶するステップを備えるようにしてもよい。 In the above TCXO control method, a step of storing the frequency when the frequency of communication between the base station and the mobile phone is synchronized may be provided.
本発明の動作とすることでＡＦＣ機能にて追従した受信周波数が期待範囲内／外いずれの場合においても受信周波数を検出可能となり再接続の成功率を向上させることが可能となる。結果的に通信維持率の向上が可能となる。 By adopting the operation of the present invention, the reception frequency can be detected regardless of whether the reception frequency followed by the AFC function is within or outside the expected range, and the success rate of reconnection can be improved. As a result, the communication maintenance rate can be improved.
以下、図面を参照して本発明を実施するための最良の形態について詳細に説明する。 The best mode for carrying out the present invention will be described below in detail with reference to the drawings.
従来の制御では、再接続状態に遷移した際にＴＣＸＯを一律設計値に設定していたが、本発明では受信周波数が期待受信周波数外にある場合を考慮し、電波断中の周波数検索を試みた回数を検出しｍ回までは再接続前に使用していたＴＣＸＯ値で検索する。再接続検出失敗が続いた場合はＴＣＸＯ設計値で再接続先の検出を実施する。前述する制御とすることで受信周波数が期待受信周波数範囲内／外いずれの場合においても受信周波数を検出可能となり再接続の成功率を向上させることが可能となる。結果的に通信維持率を向上することが可能となる。 In the conventional control, TCXO is set to a uniform design value when transitioning to the reconnection state. However, in the present invention, a case where the reception frequency is outside the expected reception frequency is considered, and a frequency search during radio interruption is attempted. The TCXO value used before reconnection is searched up to m times. When the reconnection detection failure continues, the reconnection destination is detected with the TCXO design value. With the above-described control, the reception frequency can be detected regardless of whether the reception frequency is within or outside the expected reception frequency range, and the success rate of reconnection can be improved. As a result, the communication maintenance rate can be improved.
本発明は、携帯電話機などの無線機を用いて通信を行う端末において、基地局と自端末の周波数差分を検出し同期保持を行うＡＦＣ機能及び周波数制御にＴＣＸＯを用いた携帯電話機において、特に一時的な電波断が発生した際にＴＣＸＯを適切に制御することで再接続の成功率を向上させる制御方法を提供し通信維持率を向上することを特徴とする。 The present invention relates to a mobile phone using a TCXO for frequency control and an AFC function that detects a frequency difference between a base station and its own terminal in a terminal that communicates using a wireless device such as a mobile phone. It is characterized by providing a control method for improving the success rate of reconnection by appropriately controlling the TCXO when a general radio wave interruption occurs and improving the communication maintenance rate.
（実施形態１）
本発明の一実施形態の構成を図１に示す。
(Embodiment 1)
The configuration of one embodiment of the present invention is shown in FIG.
本発明の携帯電話機は携帯電話用アンテナ（１−１）と無線部（１−２）、無線部（１−２）内部の無線通信に使用するターゲット周波数を発生させる周波数発生部（１−３）、通信を制御する制御部（１−４）、制御部（１−４）内部で受信レベルや通信品質を監視するレベル検出部（１−５）と周波数発生部（１−３）が発生させるターゲット周波数の元となる周波数を作成するＴＣＸＯ（１−７）、ＴＣＸＯ（１−７）出力周波数を補正するＡＦＣ制御部（１−６）、前述したレベル検出部でレベルがとれたことの判断を行ったり、周波数差分からＴＣＸＯ設定値を算出したり、再接続検索処理時に制御部等に命令し、検出実行結果である検出数を確認したりするＣＰＵ部（１−８）、及び一時的な値などを保持しておく記憶領域（１−９）を備える。 The cellular phone of the present invention includes a cellular phone antenna (1-1), a radio unit (1-2), and a frequency generator (1-3) that generates a target frequency used for radio communication inside the radio unit (1-2). ), A control unit (1-4) for controlling communication, a level detection unit (1-5) for monitoring the reception level and communication quality inside the control unit (1-4), and a frequency generation unit (1-3) are generated. TCXO (1-7) that creates a frequency that is the source of the target frequency to be generated, AFC control unit (1-6) that corrects the output frequency of TCXO (1-7), and the level detector described above CPU unit (1-8) for making a determination, calculating a TCXO set value from the frequency difference, instructing the control unit or the like during reconnection search processing, and confirming the number of detections as a detection execution result, and temporary Storage area (1 Equipped with a 9).
本発明の実施例を図５及び図６用いて説明する。 An embodiment of the present invention will be described with reference to FIGS.
再接続状態に遷移すると（５−１）、再接続先を検索する処理に遷移する（５−２）。再接続検出処理ではＣＰＵ（１−８）（図１）から制御部（１−５）（図１）に命令を発行し再接続処理を実行する。制御部（１−５）が一定時間再接続先を検索し再接続先を検出する。再接続先を１以上検出できれば（５−４でＮＯ）、再接続は成功（５−６）であるが、再接続先が見つからない場合（５−４でＹＥＳ）、再接続検索処理回数を確認する（５−５）。再接続検索処理回数が閾値以下であれば（５−７でＮＯ）、ＴＣＸＯ設定を変更せずに再接続検索処理を再び実効するが、閾値以上であれば（５−７でＹＥＳ）、現在設定しているＴＣＸＯ設定値の範囲では再接続できないと判断しＴＣＸＯを設計値に設定する（５−８）。 When transitioning to the reconnection state (5-1), the process proceeds to processing for searching for a reconnection destination (5-2). In the reconnection detection process, an instruction is issued from the CPU (1-8) (FIG. 1) to the control unit (1-5) (FIG. 1) to execute the reconnection process. The control unit (1-5) searches for the reconnection destination for a certain period of time and detects the reconnection destination. If one or more reconnection destinations can be detected (NO in 5-4), reconnection is successful (5-6), but if no reconnection destination is found (YES in 5-4), the number of reconnection search processes is set. Confirm (5-5). If the number of reconnection search processes is equal to or less than the threshold value (NO in 5-7), the reconnection search process is executed again without changing the TCXO setting, but if it is equal to or greater than the threshold value (YES in 5-7), the current It is determined that reconnection is not possible within the range of the set TCXO set value, and TCXO is set to the design value (5-8).
図６は上記処理フローを基に周波数差分が大きくなった状態で再接続状態に遷移した場合の動作を記載している。再接続１回目からｍ回目まではＡＦＣ機能にて算出したＴＣＸＯ設定値で再接続処理を実施している。ｍ回目が失敗した時点で現ＴＣＸＯ設定での再接続を中止しＴＣＸＯ設定を設計値に変更する。本アルゴリズムにより受信周波数が周波数差分検出可能範囲内／外いずれである場合も再接続が可能となり、通信維持率が向上することになる。 FIG. 6 shows the operation when transitioning to the reconnection state in a state where the frequency difference is large based on the above processing flow. From the first reconnection to the mth reconnection, the reconnection processing is performed with the TCXO setting value calculated by the AFC function. When the m-th time fails, the reconnection with the current TCXO setting is stopped and the TCXO setting is changed to the design value. With this algorithm, reconnection is possible regardless of whether the received frequency is within or outside the frequency difference detectable range, and the communication maintenance rate is improved.
（実施形態２）
前述した実施形態では、再接続検索処理がｍ回失敗した場合は無条件でＴＣＸＯ設計値を設定するとしていた（５−８）が、ＴＣＸＯ設計値設定以前に受信品質が確実に保てていた時のＴＣＸＯ設定値を設定することも考えられる。本処理の意図は、直近のＴＣＸＯ設定において、受信周波数に確実に追従できていた設定を用いることで更なる再接続率向上を狙うものである。本処理により複雑さは増すが再接続率の向上が期待できる。
(Embodiment 2)
In the above-described embodiment, the TCXO design value is unconditionally set when the reconnection search process has failed m times (5-8). However, the reception quality was reliably maintained before the TCXO design value was set. It is also conceivable to set the TCXO set value for the hour. The intent of this process is to further improve the reconnection rate by using a setting that can reliably follow the reception frequency in the latest TCXO setting. Although this process increases complexity, an improvement in reconnection rate can be expected.
図７及び図８に本処理の処理フローを示す。 7 and 8 show the processing flow of this processing.
図７はＴＣＸＯ設定値の保存処理である。図８の説明は図５に対する追加部分のみ記載する。 FIG. 7 shows the TCXO setting value storage process. The description of FIG. 8 describes only the addition to FIG.
まず図７において、ＴＣＸＯ設定値を保持する処理を記載する。但し本処理は本実施例を構成する１例として受信同期状態を基準にして保存する処理を記載したがこの限りである必要はない。 First, in FIG. 7, a process for holding the TCXO set value will be described. However, although this processing is described as an example of the configuration of the present embodiment, the processing is described based on the reception synchronization state, but this need not be the case.
ターゲット周波数と受信周波数の周波数差分を検出し（７−２）、ＴＣＸＯを制御する（７−３）。受信周波数とターゲット周波数の同期状態を確認し（７−４）、同期状態であればＴＣＸＯ設定値を保持する（７−６）。同期状態でなければ保持せずにＡＦＣ制御を終了（７−７）する。 A frequency difference between the target frequency and the reception frequency is detected (7-2), and the TCXO is controlled (7-3). The synchronization state between the reception frequency and the target frequency is confirmed (7-4), and if it is in the synchronization state, the TCXO set value is held (7-6). If it is not synchronized, AFC control is terminated (7-7) without being held.
次に図８に関して説明する。 Next, FIG. 8 will be described.
再接続検索処理回数を確認する（８−５）。再接続検索処理回数が閾値（ｌ）以下であれば（８−７でＮＯ）、ＴＣＸＯ設定を変更することなく再接続検索処理を再び実施する（８−２）が、閾値（ｌ）以上であれば（８−７でＹＥＳ）、閾値（ｍ）と比較する（８−９）。ここで、ｌ＜ｍである。ｍよりも小さい場合は（８−９でＮＯ）、再接続前で信頼できるＴＣＸＯ設定値（７−６で保持）を設定し（８−１０）、再接続処理を継続する。尚、この信頼できるＴＣＸＯ設定値に関しては例えば受信レベル、ノイズ量、同期検出状態などで測定することが可能だと考えるが本発明の中では同期状態として図７に記した。 The number of reconnection search processes is confirmed (8-5). If the number of reconnection search processes is less than or equal to the threshold value (l) (NO in 8-7), the reconnection search process is performed again without changing the TCXO setting (8-2). If it exists (YES in 8-7), it is compared with the threshold value (m) (8-9). Here, l <m. If it is smaller than m (NO in 8-9), a reliable TCXO setting value (retained in 7-6) is set before reconnection (8-10), and the reconnection process is continued. Note that this reliable TCXO set value can be measured, for example, according to the reception level, noise amount, synchronization detection state, etc., but in FIG.
処理回数が閾値（ｍ）よりも大きくなった場合は（８−１０でＹＥＳ）、ＴＣＸＯの設計値を設定（８−１１）し再接続処理を継続する。 When the number of processes becomes larger than the threshold value (m) (YES in 8-10), the design value of TCXO is set (8-11) and the reconnection process is continued.
本発明は、携帯電話機に適用できるのみならず、パーソナルコンピュータをインターネットに接続するための無線通信カードなどにも利用することができる。 The present invention can be applied not only to a mobile phone but also to a wireless communication card for connecting a personal computer to the Internet.
１−１ アンテナ
１−２ 無線部
１−３ 周波数発生部
１−４ 制御部
１−５ レベル検出部
１−６ ＡＦＣ制御部
１−７ ＴＣＸＯ
１−８ ＣＰＵ
１−９ 記憶領域
1-1 Antenna 1-2 Radio unit 1-3 Frequency generation unit 1-4 Control unit 1-5 Level detection unit 1-6 AFC control unit 1-7 TCXO
1-8 CPU
1-9 Storage area
Claims (6)
予め定められた期待周波数範囲外に受信周波数が該当する場合に、再接続検索処理回数が第１の所定回数を超えるまでは、前記期待周波数範囲外に属する値であって電波断状態に遷移する直近に使用されていたＴＣＸＯ値を用いて再接続を試みるものとし、
再接続検索処理回数が前記第１の所定回数を超えても再接続に成功しない場合に、ＴＣＸＯの設定値を設計値に再設定してから、再接続検索処理を再度試みることを特徴とするＴＣＸＯ制御方法。 A TCXO control method at the time of reconnection in a mobile phone,
When the received frequency falls outside the predetermined expected frequency range, the value is outside the expected frequency range and transitions to a radio wave interruption state until the number of reconnection search processes exceeds the first predetermined number of times. Suppose you try to reconnect using the TCXO value that was most recently used,
If reconnection is not successful even if the number of reconnection search processes exceeds the first predetermined number, the setting value of TCXO is reset to the design value, and then the reconnection search process is retried. TCXO control method.
前記制御部は、予め定められた期待周波数範囲外に受信周波数が該当する場合に、再接続検索処理回数が第１の所定回数を超えるまでは、前記期待周波数範囲外に属する値であって電波断状態に遷移する直近に使用されていたＴＣＸＯ値を用いて再接続を試みる指令を出力する手段と、
再接続検索処理回数が前記第１の所定回数を超えても再接続に成功しない場合に、ＴＣＸＯの設定値を設計値に再設定してから、再接続検索処理を再度試みる指令を出力する手段と、を備えることを特徴とするＴＣＸＯ制御方式。 A TCXO control system including a control unit that outputs an execution command at the time of reconnection in a mobile phone,
When the received frequency falls outside the predetermined expected frequency range , the control unit is a value belonging to the outside of the expected frequency range and the radio wave until the reconnection search processing count exceeds the first predetermined number. Means for outputting a command to attempt reconnection using a TCXO value that has been used most recently to transition to a disconnected state;
Means for outputting a command to re-attempt the reconnection search process after resetting the TCXO setting value to the design value when the reconnection is not successful even when the reconnection search process exceeds the first predetermined number of times. And a TCXO control system.
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