JP2005294914A - Different frequency measurement method - Google Patents

Different frequency measurement method Download PDF

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JP2005294914A
JP2005294914A JP2004102901A JP2004102901A JP2005294914A JP 2005294914 A JP2005294914 A JP 2005294914A JP 2004102901 A JP2004102901 A JP 2004102901A JP 2004102901 A JP2004102901 A JP 2004102901A JP 2005294914 A JP2005294914 A JP 2005294914A
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JP4409333B2 (en
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Kentaro Fukushima
健太郎 福島
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Fujitsu Ltd
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Abstract

【目的】 コンプレストモードにおいて測定条件のばらつきによる受信レベルの測定の誤りや、セル間の受信レベルに対する大小関係の判定の誤りを防止する。
【構成】 コンプレストモードにおいて、異周波測定時間に応じて測定レベルを補正する。すなわち、(1)レベル測定時間Ｔに応じて現測定レベルＰと過去の測定レベルとにそれぞれ重み付けα、βを付け、(2)重み付けされた現測定レベルと過去の測定レベルを加算し、(3)加算結果を測定レベルとして出力する。
【選択図】 図５[Objective] To prevent errors in measurement of reception levels due to variations in measurement conditions in the compressed mode and errors in determining the magnitude relationship with respect to reception levels between cells.
[Configuration] In the compressed mode, the measurement level is corrected according to the different frequency measurement time. (1) Weights α and β are assigned to the current measurement level P and the past measurement level according to the level measurement time T, respectively. (2) The weighted current measurement level and the past measurement level are added, and ( 3) Output the addition result as a measurement level.
[Selection] Figure 5

Description

本発明は異周波測定方法に係わり、特に、コンプレストモードにおいて通信中基地局の送信周波数と異なる送信周波数の基地局から受信する信号のレベルを測定する異周波測定方法に関する。   The present invention relates to a different frequency measurement method, and more particularly to a different frequency measurement method for measuring a level of a signal received from a base station having a transmission frequency different from a transmission frequency of a communicating base station in a compressed mode.

移動通信において、移動端末(移動局)は移動しながら基地局を介して相手端末と通信する。移動局が移動により基地局がカバーする地域(セル)の境界に近づくと、該基地局からの受信電波が弱くなり、隣接基地局からの受信電波が強くなる。かかる場合、移動局は、隣接基地局のうち最も受信電波状態が良好な基地局をサーチし、該サーチした基地局に無瞬断で切り替える（ハンドオーバ）。
隣接基地局の送信周波数が通信中基地局(現基地局)の送信周波数と同じであれば、移動局は受信周波数を切り替えることなく、現基地局と通信しながら隣接基地局の電波状態、例えば受信レベルを測定することができる。しかし、隣接基地局の送信周波数が現基地局の送信周波数と異なる場合には、受信周波数を切り替える必要がある。移動局が勝手に受信周波数を切り替えて隣接基地局の受信レベルを測定すれば、現基地局からのデータを受信できなくなる。このため、網側(無線ネットワーク制御装置RNC)は、移動局がセル境界に近づいたかを監視し、近づけば周辺の基地局の送信周波数を調べ、現基地局の送信周波数と異なる送信周波数の基地局が存在すれば、コンプレストモードにして移動局が現基地局と通信しながら異周波数の周辺基地局の電波状態を測定できるようにする。 In mobile communication, a mobile terminal (mobile station) communicates with a counterpart terminal via a base station while moving. When the mobile station moves and approaches the boundary of the area (cell) covered by the base station, the radio wave received from the base station becomes weak and the radio wave received from the adjacent base station becomes strong. In such a case, the mobile station searches for a base station with the best reception radio wave state among adjacent base stations, and switches to the searched base station without interruption (handover).
If the transmission frequency of the adjacent base station is the same as the transmission frequency of the communicating base station (current base station), the mobile station communicates with the current base station without switching the reception frequency, for example, the radio state of the adjacent base station, for example, The reception level can be measured. However, when the transmission frequency of the adjacent base station is different from the transmission frequency of the current base station, it is necessary to switch the reception frequency. If the mobile station arbitrarily switches the reception frequency and measures the reception level of the adjacent base station, data from the current base station cannot be received. For this reason, the network side (radio network controller RNC) monitors whether the mobile station has approached the cell boundary, checks the transmission frequency of the surrounding base station if it approaches, and transmits a base with a transmission frequency different from the transmission frequency of the current base station. If a station exists, the mobile station can set the compressed mode so that the mobile station can measure the radio wave conditions of neighboring base stations of different frequencies while communicating with the current base station.

すなわち、コンプレストモードとは現基地局からのデータ受信を行いつつ、異周波数のセル検出(セルサーチ)や該セルのレベル測定を行うために用いられる制御モードである。図１８に示すように、通常連続して行う通信処理((A)参照)を、コンプレストモード((B)参照)では一定時間通信処理を中断し(GAPを開ける)、その間に異周波に対してレベル測定等の各処理を行う。全てのフレームに対してGAPを開けるわけではなく、GAPのないフレームをノーマルフレーム、GAPのあるフレームをコンプレストフレームと呼ぶ。コンプレストフレームの非GAP期間では、通信品質を保つためにノーマルフレームよりも大きな電力で送信する。GAPは単一のフレームに開ける場合(シングルフレーム、（B）)と,（C）に示すように2つのフレームに跨って開ける場合(ダブルフレーム)がある。3GPPの仕様上、（D）に示すようにコンプレストフレームの位置、GAPの位置、長さ等はその時の環境や測定要求により異なる。
コンプレストモードに入ると、たとえば図１９に示すように、2つのギャップgap1，gap2が存在する第1送信ギャップパターン(TG pattern 1)と第2送信ギャップパターン(TG pattern 2)の繰り返しでギャップ位置を決定する8つのパラメータTGSN，TGL1，TGL2，TGD，TGPL1，TGPL2，TGPRC，TGCFNが特定される。尚、図１９は3GPP仕様からの抜粋である。 In other words, the compressed mode is a control mode used to detect a cell at a different frequency (cell search) and measure the level of the cell while receiving data from the current base station. As shown in FIG. 18, normally continuous communication processing (see (A)) is interrupted for a certain period of time in the compressed mode (see (B)) (GAP is opened), and during that time, the frequency is changed to a different frequency. Each processing such as level measurement is performed. GAPs are not opened for all frames. Frames without GAP are called normal frames, and frames with GAP are called compressed frames. In a non-GAP period of a compressed frame, transmission is performed with a larger power than a normal frame in order to maintain communication quality. GAP can be opened in a single frame (single frame, (B)), or can be opened across two frames as shown in (C) (double frame). According to the 3GPP specifications, as shown in (D), the position of the compressed frame, the position and length of the GAP vary depending on the environment and measurement requirements at that time.
When entering the compressed mode, for example, as shown in FIG. 19, the gap position is repeated by repeating the first transmission gap pattern (TG pattern 1) and the second transmission gap pattern (TG pattern 2) in which two gaps gap1 and gap2 exist. 8 parameters TGSN, TGL1, TGL2, TGD, TGPL1, TGPL2, TGPRC, and TGCFN are determined. FIG. 19 is an excerpt from the 3GPP specification.

従来技術として2つの通信システムにおける時間基準間のオフセットを測定するものがある(例えば、特許文献１参照)。しかし、この従来技術は、デュアルモード携帯電話機において、通信中セルの時間基準と隣接セルの時間基準との間のオフセットを測定し、該オフセットを考慮して2つの通信システム（例えばUMTSとGSM）において通信できるようにしたものであり、コンプレストモードにおいて異周波測定するものではない。
特開２００３−３０９８７０号公報 As a conventional technique, there is one that measures an offset between time references in two communication systems (see, for example, Patent Document 1). However, this prior art measures the offset between the time reference of the cell in communication and the time reference of the neighboring cell in a dual-mode mobile phone, and takes into account the offset, so that two communication systems (for example, UMTS and GSM) In the compressed mode, different frequencies are not measured.
JP 2003-309870 A

コンプレストモードにおけるレベル測定実行時のGAP長は仕様上、固定長ではない。また測定時の周辺環境も刻々と変化しており、異周波レベル測定を複数回行った場合、測定時間や移動速度といった測定条件にばらつきが生じる可能性が高い。かかる測定条件のばらつきは受信レベルの測定の誤りや、セル間の受信レベルに対する大小関係の判定の誤りにつながり、サービス品質を低下させてしまう問題がある。
以上から本発明の目的は、コンプレストモードにおいて測定条件のばらつきによる受信レベルの測定の誤りや、セル間の受信レベルに対する大小関係の判定の誤りを防止し、サービス品質の低下を防ぐことである。 The GAP length when performing level measurement in the compressed mode is not a fixed length due to the specifications. In addition, the surrounding environment at the time of measurement changes every moment, and when different frequency level measurement is performed a plurality of times, there is a high possibility that measurement conditions such as measurement time and moving speed will vary. Such variations in measurement conditions lead to errors in measurement of the reception level and errors in determining the magnitude relationship with respect to the reception level between cells, and there is a problem that service quality is degraded.
Accordingly, an object of the present invention is to prevent an error in measurement of a reception level due to variations in measurement conditions in a compressed mode, an error in determining a magnitude relationship with respect to a reception level between cells, and a reduction in service quality. .

上記課題は本発明によれば、通信中基地局の送信周波数と異なる送信周波数の基地局から受信する信号のレベルを測定するコンプレストモードにおいて、異周波測定時間に応じて測定レベルを補正することにより達成される。前記補正は、(1)レベル測定時間に応じて現測定レベルと過去の測定レベルにそれぞれ重み付けをし、(2)重み付けされた現測定レベルと過去の測定レベルを加算し、(3)加算結果を測定レベルとして出力することにより行なう。また、異周波測定時の移動局の移動速度を検出し、移動速度別に前記測定レベルの補正を行なう。
また、上記課題は本発明によれば、通信中基地局の送信周波数と異なる送信周波数の基地局から受信する信号のレベルを測定するコンプレストモードにおいて、測定時間が同一の測定レベルを加算平均して測定時間毎に保存し、基準測定時間における加算平均値と現測定レベルの測定時間における加算平均値との差を補正値として演算し、現測定レベルに前記補正値を加算し、加算結果を測定レベルとして出力することにより達成される。この際、レベル範囲毎に測定時間が同一の測定レベルを加算平均して測定時間毎に保存し、現測定レベルが属するレベル範囲の基準測定時間における加算平均値と現測定レベルの測定時間における加算平均値との差を補正値として演算することもできる。また、異周波測定時の移動局の移動速度を検出し、移動速度別に前記測定レベルの補正を行なう。 According to the present invention, in the compressed mode for measuring the level of a signal received from a base station having a transmission frequency different from the transmission frequency of the communicating base station, the measurement level is corrected according to the different frequency measurement time. Is achieved. The correction includes (1) weighting the current measurement level and the past measurement level according to the level measurement time, (2) adding the weighted current measurement level and the past measurement level, and (3) the addition result. Is output as a measurement level. Further, the moving speed of the mobile station at the time of different frequency measurement is detected, and the measurement level is corrected for each moving speed.
In addition, according to the present invention, the above-described problem is obtained by adding and averaging measurement levels having the same measurement time in a compressed mode in which the level of a signal received from a base station having a transmission frequency different from the transmission frequency of the communicating base station is measured. Is stored for each measurement time, and the difference between the addition average value at the reference measurement time and the addition average value at the measurement time of the current measurement level is calculated as a correction value. The correction value is added to the current measurement level, and the addition result is calculated. This is achieved by outputting as a measurement level. At this time, the measurement levels with the same measurement time for each level range are averaged and stored for each measurement time, and the average value for the reference measurement time of the level range to which the current measurement level belongs and the addition for the measurement time of the current measurement level. The difference from the average value can be calculated as a correction value. Further, the moving speed of the mobile station at the time of different frequency measurement is detected, and the measurement level is corrected for each moving speed.

本発明によれば、異周波測定時間に応じて測定レベルを補正するようにしたから、コンプレストモードにおいて測定時間のばらつきによる受信レベルの測定の誤りや、セル間の受信レベルに対する大小関係の判定の誤りを防止し、サービス品質の低下を防ぐことができる。
本発明によれば、測定時間が同一の測定レベルを加算平均して測定時間毎に保存し、基準測定時間における加算平均値と現測定レベルの測定時間における加算平均値との差を補正値として演算し、現測定レベルに前記補正値を加算し、加算結果を測定レベルとして出力するようにしたから、全ての測定結果に対し測定時間という条件の差をなくすことができ、特に複数セルのレベル測定を行っているような場合、セル間の受信レベル測定結果に対する大小関係を精度良く行うことが可能となる。
本発明によれば、レベル範囲毎に測定時間が同一の測定レベルを加算平均して測定時間毎に保存し、現測定レベルが属するレベル範囲の基準測定時間における加算平均値と現測定レベルの測定時間における加算平均値との差を補正値として演算し、現測定レベルに前記補正値を加算し、加算結果を測定レベルとして出力するようにしたから、測定レベルの変動幅が大きい場合に精度をより高める事が可能となる。
本発明によれば、異周波測定時の移動局の移動速度を検出し、移動速度別に測定レベルの補正を行なうようにしたから、移動しながら複数セルのレベル測定を行っているような場合、セル間の受信レベル測定結果に対する大小関係を精度良く行うことが可能となる。 According to the present invention, since the measurement level is corrected according to the different frequency measurement time, the measurement of the reception level due to the measurement time variation in the compressed mode and the determination of the magnitude relationship with respect to the reception level between cells are performed. Errors can be prevented, and deterioration of service quality can be prevented.
According to the present invention, the measurement levels having the same measurement time are added and averaged and stored for each measurement time, and the difference between the addition average value at the reference measurement time and the addition average value at the measurement time of the current measurement level is used as a correction value. Since it calculates and adds the correction value to the current measurement level and outputs the addition result as the measurement level, it can eliminate the difference of the measurement time condition for all measurement results, especially the level of multiple cells When measurement is performed, it is possible to accurately perform a magnitude relationship with respect to a reception level measurement result between cells.
According to the present invention, the measurement levels having the same measurement time for each level range are averaged and stored for each measurement time, and the average value and the measurement of the current measurement level in the reference measurement time of the level range to which the current measurement level belongs are measured. The difference from the average value over time is calculated as a correction value, the correction value is added to the current measurement level, and the addition result is output as the measurement level. Therefore, accuracy is improved when the fluctuation range of the measurement level is large. It becomes possible to raise more.
According to the present invention, since the moving speed of the mobile station at the time of different frequency measurement is detected and the measurement level is corrected according to the moving speed, when measuring the level of a plurality of cells while moving, It is possible to accurately perform the magnitude relationship with respect to the reception level measurement result between cells.

コンプレストモードにおいて測定した周辺セルの受信レベルを、補正手段において、測定時間あるいは移動速度を考慮して補正し、受信レベルの精度を向上すると共に、周辺セル間の受信状態の比較精度を向上する。
補正手段は、測定時間に応じて測定レベルを補正し(第1の補正)、あるいは、基準測定時間における測定レベルの平均値と現測定レベルの測定時間における平均値との差を補正値とし、該補正値を現測定レベルに加算することにより補正する(第2の補正)。あるいは、異周波測定時の移動局の移動速度を検出し、移動速度別に前記第１の補正、第２の補正を行なう。
以上のようにすれば、コンプレストモードにおいて測定条件のばらつきによる受信レベルの測定の誤りや、セル間の受信レベルに対する大小関係の判定の誤りを防止し、サービス品質の低下を防ぐことが可能となる。 In the correction mode, the reception level of the neighboring cells measured in the compressed mode is corrected in consideration of the measurement time or the moving speed, thereby improving the accuracy of the reception level and improving the comparison accuracy of the reception state between the neighboring cells. .
The correction means corrects the measurement level according to the measurement time (first correction), or uses the difference between the average value of the measurement level at the reference measurement time and the average value at the measurement time of the current measurement level as a correction value. Correction is performed by adding the correction value to the current measurement level (second correction). Alternatively, the moving speed of the mobile station at the time of different frequency measurement is detected, and the first correction and the second correction are performed for each moving speed.
By doing so, it is possible to prevent errors in reception level measurement due to variations in measurement conditions in the compressed mode and errors in determining the magnitude relationship with respect to the reception level between cells, and prevent deterioration in service quality. Become.

図１は本発明を適用する移動局の構成図であり、RF部１１の受信側１１ａはアンテナ１０で受信した無線信号を増幅すると共に、べースバンド信号に周波数をダウンコンバートし、ついでQPSK直交復調して受信複素信号(Ｉ，Ｑ信号)を出力し、RF部１１の送信側１１ｂは送信複素信号(I,Q信号)をQPSK直交変調し、無線周波数にアップコンバートし、ついで高周波増幅してアンテナより送信する。データ処理部１２において、逆拡散回路２１は受信I,Q信号に拡散コードを乗算して逆拡散し、逆拡散結果を復号部２２、レベル測定部２３、移動速度検出部２４、セル検出部２５に入力する。復号部２２は受信データを復号して復号結果を制御部１３に入力し、レベル測定部２３は受信信号レベルを測定し、測定結果を制御部１３に入力し、移動速度検出部２４は移動速度を検出して制御部１３に入力し、セル検出部２５はセルを検出して制御部１３に入力する。送信部２６は、送信データを符号化し、符号化データに拡散コードを乗算して送信複素信号(Ｉ，Ｑ信号)をRF部１１に入力する。制御部１３はコンプレストモードが網側より指令されると、適宜のタイミングでRF部１１のシンセサイザ(図示せず)を制御して受信周波数を切り替えると共に、レベル測定部２３で測定された受信レベル(測定レベル)の補正を行なう。   FIG. 1 is a configuration diagram of a mobile station to which the present invention is applied. A receiving side 11a of an RF unit 11 amplifies a radio signal received by an antenna 10, down-converts a frequency to a baseband signal, and then performs QPSK orthogonal demodulation. Then, the reception complex signal (I, Q signal) is output, and the transmission side 11b of the RF unit 11 performs QPSK quadrature modulation on the transmission complex signal (I, Q signal), up-converts to a radio frequency, and then performs high-frequency amplification. Transmit from antenna. In the data processing unit 12, the despreading circuit 21 despreads the received I and Q signals by multiplying the spreading code, and the despread result is decoded by the decoding unit 22, level measuring unit 23, moving speed detecting unit 24, and cell detecting unit 25. To enter. The decoding unit 22 decodes the received data and inputs the decoding result to the control unit 13, the level measurement unit 23 measures the received signal level, inputs the measurement result to the control unit 13, and the moving speed detection unit 24 sets the moving speed. Is detected and input to the control unit 13, and the cell detection unit 25 detects the cell and inputs it to the control unit 13. The transmission unit 26 encodes transmission data, multiplies the encoded data by a spreading code, and inputs a transmission complex signal (I, Q signal) to the RF unit 11. When the compressed mode is commanded from the network side, the control unit 13 controls the synthesizer (not shown) of the RF unit 11 at an appropriate timing to switch the reception frequency, and the reception level measured by the level measurement unit 23. Correct (measurement level).

図２はRF部１１の構成図であり、受信側１１ａにおいて、低ノイズアンプ(LNA)11a-1はアンテナ１０、アンテナ共用器１１ｃを介して入力する受信無線信号を増幅し、バンドパスフィルタ(BPF)11a-2は不要成分を除去し、周波数変換部11a-3は周波数シンセサイザ１１ｄから出力する周波数信号を受信無線信号に乗算して中間周波数にダウンコンバートし、中間増幅器（IFA）11a-4は中間周波信号を中間周波増幅し、AD変換器(ADC)11a-5は入力する中間周波信号をディジタルに変換し、変復調部１１ｅは入力信号に直交復調処理を施して複素Ｉ，Ｑ信号にして送出する。また、送信側１１ｂにおいて、変復調部１１ｅは送信Ｉ，Ｑ信号に直交変調処理を施し、DA変換器(DAC)11b-1は変調信号をアナログに変換し、周波数変換部11b-2は入力信号の周波数を無線周波数にアップコンバートし、バンドパスフィルタ(BPF)11b-3は無線周波数成分を選択通過し、電力増幅器(PA)11b-4は無線信号を高周波増幅してアンテナ共用器１１ｃ、アンテナ１０を介して送信する。周波数シンセサイザ１１ｄは、制御部１３からの指示に従って、発振周波数を切り替えて異周波基地局から送信される信号を受信して受信レベルを測定できるようにする。   FIG. 2 is a configuration diagram of the RF unit 11. On the receiving side 11a, a low noise amplifier (LNA) 11a-1 amplifies a received radio signal input via the antenna 10 and the antenna duplexer 11c, and a band pass filter ( (BPF) 11a-2 removes unnecessary components, and the frequency converter 11a-3 multiplies the received radio signal by the frequency signal output from the frequency synthesizer 11d, down-converts it to an intermediate frequency, and intermediate amplifier (IFA) 11a-4 Amplifies the intermediate frequency signal, the AD converter (ADC) 11a-5 converts the input intermediate frequency signal to digital, and the modem unit 11e performs orthogonal demodulation processing on the input signal to form complex I and Q signals. And send it out. On the transmission side 11b, the modulation / demodulation unit 11e performs orthogonal modulation processing on the transmission I and Q signals, the DA converter (DAC) 11b-1 converts the modulation signal into analog, and the frequency conversion unit 11b-2 receives the input signal. The bandpass filter (BPF) 11b-3 selectively passes the radio frequency component, and the power amplifier (PA) 11b-4 amplifies the radio signal at a high frequency to perform the antenna duplexer 11c and the antenna. 10 to transmit. The frequency synthesizer 11d switches the oscillation frequency in accordance with an instruction from the control unit 13 and receives a signal transmitted from the different frequency base station so that the reception level can be measured.

図３は移動速度検出部２４の構成図であり、電力化部２４ａは受信I，Q信号を逆拡散して得られた受信Ich信号（SI）と受信Qch信号(SQ)を用いて次式
SI 2＋SQ 2 (1)
により電力Ｐを算出する。電力Ｐはフェージングにより変動するから、周波数変換部２４ｂは該電力Ｐよりフェージング周波数を抽出し、速度算出部２４ｃはフェージング周波数に周知の演算により移動速度をVを算出して出力する。
図４はレベル測定部２３の構成図であり、電力化部２３ａは受信I，Q信号を逆拡散して得られた受信Ich信号（SI）と受信Qch信号(SQ)を用いて(1)式により電力Ｐを算出し、真数−対数変換部２３ｂは電力Pを対数に変換してRSSI(Received Signal Strength Indicator)を受信レベルとして出力する。なお、受信レベルはRSSIに限らず、Ec/N0、RSCP(Received Signal Code Power)などを使用することもできる。
以上の図１〜図４の構成は以降のいずれの実施例にも適用できるものである。 FIG. 3 is a block diagram of the moving speed detector 24. The power generator 24a uses the received Ich signal (S I ) and the received Qch signal (S Q ) obtained by despreading the received I and Q signals. Next formula
S I 2 + S Q 2 (1)
To calculate the power P. Since the power P fluctuates due to fading, the frequency conversion unit 24b extracts a fading frequency from the power P, and the speed calculation unit 24c calculates a moving speed V by a known calculation for the fading frequency and outputs it.
FIG. 4 is a block diagram of the level measuring unit 23. The power generating unit 23a uses the received Ich signal (S I ) and the received Qch signal (S Q ) obtained by despreading the received I and Q signals ( The power P is calculated from the equation (1), and the true-logarithm conversion unit 23b converts the power P into a logarithm and outputs RSSI (Received Signal Strength Indicator) as a reception level. The reception level is not limited to RSSI, and Ec / N 0 , RSCP (Received Signal Code Power), etc. can also be used.
1 to 4 can be applied to any of the following embodiments.

図５は第1実施例の異周波測定方法の説明図であり、制御部１３の異周波測定処理をブロック図で示している。測定結果である測定レベルＰ、測定時間Ｔは図1のレベル測定部23より入力される。
重み係数保存部３１は、現測定レベルと過去の測定レベルのそれぞれに付ける重み係数α、βをレベル測定時間(スロット数)に応じて保存する。すなわち、重み係数保存部３１は、レベル測定時間(スロット数)と重み係数α、βの対応を示す係数テーブルを記憶する。1フレームは１５スロットで構成され、コンプレストモードにおいてGAP長は、スロット数で特定される。図では説明上、測定時間として3スロット、5スロット、7スロットの場合のみ示しているがこれらに限らない。重み係数αとβの和は1であり、測定時間が長くなる程、αは大きく、βは小さくなるように決められている。なお、α，βの値は一例であり、実験的に最適な重み係数を決定することができる。
重み係数決定部３２は実際の測定時間Ｔに応じた重み係数α、βを重み係数保存部３１より求め、乗算部３３は現測定レベルＰに重み係数αを乗算し、乗算部３４は前回の測定レベルに重み係数βを乗算し、加算部３５は各乗算結果を加算し、加算結果を測定レベルとして出力し、遅延部３６は今回の測定レベルを、次の測定レベルに対して前回の測定レベルとして出力する。 FIG. 5 is an explanatory diagram of the different frequency measurement method of the first embodiment, and shows the different frequency measurement process of the control unit 13 in a block diagram. The measurement level P and the measurement time T, which are measurement results, are input from the level measurement unit 23 in FIG.
The weighting factor storage unit 31 stores the weighting factors α and β assigned to the current measurement level and the past measurement level according to the level measurement time (number of slots). That is, the weight coefficient storage unit 31 stores a coefficient table indicating the correspondence between the level measurement time (number of slots) and the weight coefficients α and β. One frame is composed of 15 slots, and the GAP length is specified by the number of slots in the compressed mode. In the figure, for the sake of explanation, only the measurement time of 3 slots, 5 slots, and 7 slots is shown, but it is not limited thereto. The sum of the weighting factors α and β is 1, and the larger the measurement time, the larger α and the smaller β. Note that the values of α and β are examples, and an optimum weighting factor can be determined experimentally.
The weighting factor determination unit 32 obtains the weighting factors α and β corresponding to the actual measurement time T from the weighting factor storage unit 31, the multiplication unit 33 multiplies the current measurement level P by the weighting factor α, and the multiplication unit 34 The measurement level is multiplied by the weighting coefficient β, the addition unit 35 adds each multiplication result, and outputs the addition result as the measurement level. The delay unit 36 sets the current measurement level to the next measurement level and the previous measurement level. Output as level.

第1実施例において、重み係数αは測定時間が長くなる程大きくなるため、異周波測定時間に応じて測定レベルを補正したことになる。
第1実施例によれば、異周波測定時間に応じて測定レベルを補正するようにしているため、コンプレストモードにおいて測定時間のばらつきによる受信レベルの測定の誤りや、セル間の受信レベルに対する大小関係の判定の誤りを防止し、サービス品質の低下を防ぐことができる。 In the first embodiment, since the weighting factor α increases as the measurement time increases, the measurement level is corrected according to the different frequency measurement time.
According to the first embodiment, the measurement level is corrected according to the different frequency measurement time, so in the compressed mode, the measurement error of the reception level due to the variation of the measurement time and the magnitude of the reception level between cells are small or large. It is possible to prevent an error in determining the relationship and to prevent a deterioration in service quality.

図６は第２実施例の異周波測定処理を行なう制御部１３の機能ブロック図であり、測定結果である測定レベルＰ、測定時間Ｔは図1のレベル測定部23より入力される。
測定時間／平均値保存部４１は、測定時間が同一の測定レベルを加算平均して得られた加算平均値を測定時間(スロット数)別に保存する。すなわち、測定時間／平均値保存部４１は、測定時間と加算平均値との対応を示す測定時間／平均値テーブルを記憶する。図では説明上、測定時間として3スロット、5スロット、7スロットの場合のみ示しているがこれらに限らない。
平均値更新／抽出部４２は前記テーブルより基準測定時間(たとえば５スロット)における加算平均値Ｙと現測定レベルの測定時間（たとえば３スロット）に応じた加算平均値Ｘをそれぞれ読み出してオフセット補正値算出部４３に入力すると共に、現測定レベルの測定時間（３スロット）に応じた加算平均値を算出して測定時間／平均値テーブルを更新する。
オフセット補正値算出部４３は、基準測定時間における加算平均値Ｙと現測定レベルの測定時間における加算平均値Ｘとの差分ΔＰ
ΔＰ=（Ｙ−Ｘ） (2)
を補正値として算出して出力し、測定結果補正部４４は現測定レベルPに補正値ΔＰを加算し、加算結果（Ｐ＋ΔＰ）を測定レベルとして出力する。 FIG. 6 is a functional block diagram of the control unit 13 that performs the different frequency measurement process of the second embodiment, and the measurement level P and the measurement time T, which are measurement results, are input from the level measurement unit 23 of FIG.
The measurement time / average value storage unit 41 stores the addition average value obtained by averaging the measurement levels having the same measurement time for each measurement time (number of slots). That is, the measurement time / average value storage unit 41 stores a measurement time / average value table indicating the correspondence between the measurement time and the addition average value. In the figure, for the sake of explanation, only the measurement time of 3 slots, 5 slots, and 7 slots is shown, but it is not limited thereto.
The average value update / extraction unit 42 reads out the addition average value Y in the reference measurement time (for example, 5 slots) and the addition average value X corresponding to the measurement time of the current measurement level (for example, 3 slots) from the table, respectively, and the offset correction value. While inputting into the calculation part 43, the addition average value according to the measurement time (3 slots) of the present measurement level is calculated, and a measurement time / average value table is updated.
The offset correction value calculation unit 43 calculates the difference ΔP between the addition average value Y at the reference measurement time and the addition average value X at the measurement time of the current measurement level.
ΔP = (Y−X) (2)
Is calculated and output as a correction value, and the measurement result correction unit 44 adds the correction value ΔP to the current measurement level P, and outputs the addition result (P + ΔP) as the measurement level.

以上では基準の測定時間を5slotとして説明したが、性能や状況に応じて基準の測定時間を3、5、7slot等から選択することができる。
過去のレベル測定結果より測定時間別に測定結果の平均値Ｘ，Ｙ，Ｚが求まっている状態において、測定時間が3slotの測定結果Ｐが入力すると、該測定結果を基準測定時間5slot相当となるように補正を行う。この場合の補正値ΔＰは図７の(a)に示すようにofst3-5（＝Ｙ−Ｘ）となる。従って、実際の測定結果Ｐに補正値ofst3-5を加算した値（＝Ｐ＋Ｙ−Ｘ）を補正後の測定結果とする。また、測定時間が7slotの測定結果Ｐが入力した場合、基準測定時間5slot相当となるように補正を行う。この場合の補正値ΔＰは図７の(b)に示すようにofst7-5（＝Ｙ−Ｚ）となる。従って実際の測定結果Ｐにofst7-5を加算した値（＝Ｐ＋Ｙ−Ｚ）が補正後の測定結果となる。なお、測定時間が3slotで基準測定時間が7slotの場合の補正値ofst3-7を図7の(c)に示す。 Although the reference measurement time has been described as 5 slots in the above, the reference measurement time can be selected from 3, 5, 7 slots, etc. according to the performance and situation.
In the state where the average values X, Y, and Z of the measurement results are obtained for each measurement time from the past level measurement results, if the measurement result P with a measurement time of 3 slots is input, the measurement results are equivalent to the reference measurement time of 5 slots. Make corrections. The correction value ΔP in this case is ofst3-5 (= Y−X) as shown in FIG. Therefore, a value obtained by adding the correction value ofst3-5 to the actual measurement result P (= P + Y−X) is used as the measurement result after correction. Further, when the measurement result P having a measurement time of 7 slots is input, correction is performed so as to correspond to the reference measurement time of 5 slots. The correction value ΔP in this case is ofst7-5 (= Y−Z) as shown in FIG. Accordingly, a value obtained by adding ofst7-5 to the actual measurement result P (= P + Y−Z) becomes the measurement result after correction. FIG. 7C shows the correction value ofst3-7 when the measurement time is 3 slots and the reference measurement time is 7 slots.

図８は第２実施例における制御部１３の処理フローである。測定結果(測定レベルＰ、測定時間Ｔ)が入力すると(ステップ１０１)、測定時間／平均値テーブルより基準測定時間における加算平均値と現測定レベルの測定時間における加算平均値をそれぞれ読み出して(2)式によりオフセット補正値ΔＰを算出する(ステップ１０２)。ついで、次式
補正結果＝Ｐ＋ΔＰ (3)
により補正結果を算出し(ステップ１０３)、該補正結果を測定レベルとして出力し(ステップ１０４)、最後に、測定時間Ｔの加算平均を算出して測定時間／平均値テーブルを更新する(ステップ１０５)。
以上のように、第2実施例によれば、全ての測定結果に対し測定時間という条件の差をなくす事で、特に複数セルのレベル測定を行っているような場合ではセル間の受信レベル測定結果に対する大小関係を精度良く行うことが可能となる。 FIG. 8 is a processing flow of the control unit 13 in the second embodiment. When the measurement results (measurement level P, measurement time T) are input (step 101), the addition average value at the reference measurement time and the addition average value at the measurement time of the current measurement level are read from the measurement time / average value table (2 ) To calculate the offset correction value ΔP (step 102). Next, the following equation Correction result = P + ΔP (3)
(Step 103), and outputs the correction result as a measurement level (step 104). Finally, an addition average of the measurement time T is calculated and the measurement time / average value table is updated (step 105). ).
As described above, according to the second embodiment, by eliminating the difference in the condition of measurement time for all measurement results, especially when measuring the level of multiple cells, measurement of the reception level between cells. It becomes possible to accurately perform the magnitude relation to the result.

第３実施例は、異周波測定レベル範囲を幾つかの範囲に分割し、それぞれのレベル範囲毎に第2実施例を適用する。すなわち、第３実施例では、レベル範囲毎に測定時間が同一の測定レベルを加算平均して測定時間毎に保存し、現測定レベルが属するレベル範囲の基準測定時間における加算平均値と現測定レベルの測定時間における加算平均値との差を補正値ΔＰとして演算し、(3)式により実際の測定レベルを補正して出力する。
第３実施例の機能ブロック構成は第２実施例と同じであり、図９に示す測定時間／平均値テーブルが用いられる点が異なる。
図９の測定時間／平均値テーブルでは、レベル範囲Ｌ１〜Ｌ４毎に、測定時間(スロット数)が同一の測定レベルを加算平均し、該平均値を測定時間別に保持している。たとえば、レベル範囲Ｌ１では、測定時間３，５，７スロットに対応して加算平均値X1，Y1，Z1が保持され、レベル範囲Ｌ２では、測定時間３，５，７スロットに対応して加算平均値X2，Y2，Z2が保持され、同様に各レベル範囲の加算平均値が保持されている。尚、図９のレベル範囲L１〜L４は一例であり、種々のレベル範囲が考えられる。
図１０はレベル範囲毎、測定時間毎のオフセット補正値説明図であり、(a)は基準測定時間が5スロット、実測定時間が3スロットの場合の各レベルＬ１〜Ｌ４におけるオフセット補正値、(b)は基準測定時間が5スロット、実測定時間が７スロットの場合の各レベルＬ１〜Ｌ４におけるオフセット補正値、(c)は基準測定時間が７スロット、実測定時間が３スロットの場合の各レベルＬ１〜Ｌ４におけるオフセット補正値である。 In the third embodiment, the different frequency measurement level range is divided into several ranges, and the second embodiment is applied to each level range. That is, in the third embodiment, the measurement levels having the same measurement time for each level range are added and averaged and stored for each measurement time, and the addition average value and the current measurement level in the reference measurement time of the level range to which the current measurement level belongs are stored. Is calculated as a correction value ΔP, and the actual measurement level is corrected by the equation (3) and output.
The functional block configuration of the third embodiment is the same as that of the second embodiment, except that the measurement time / average value table shown in FIG. 9 is used.
In the measurement time / average value table of FIG. 9, for each level range L1 to L4, measurement levels having the same measurement time (number of slots) are added and averaged, and the average value is held for each measurement time. For example, in the level range L1, the addition average values X 1 , Y 1 , Z 1 are held corresponding to the measurement times 3, 5, 7 slots, and in the level range L2, the measurement times 3, 5, 7 slots are supported. Thus, the addition average values X 2 , Y 2 , and Z 2 are held, and similarly, the addition average value of each level range is held. Note that the level ranges L1 to L4 in FIG. 9 are examples, and various level ranges can be considered.
FIG. 10 is an explanatory diagram of offset correction values for each level range and for each measurement time. (A) is an offset correction value for each level L1 to L4 when the reference measurement time is 5 slots and the actual measurement time is 3 slots. b) Offset correction value at each of the levels L1 to L4 when the reference measurement time is 5 slots and the actual measurement time is 7 slots, and (c) is each when the reference measurement time is 7 slots and the actual measurement time is 3 slots. This is an offset correction value at levels L1 to L4.

図１１は第３実施例における制御部１３の処理フローである。
測定結果(測定レベルＰ、測定時間Ｔ)が入力すると(ステップ２０１)、測定時間／平均値テーブル(図９)より、現測定レベルが属するレベル範囲(たとえばＬ３)の基準測定時間(たとえば5スロット)における加算平均値Y3と現測定レベルの測定時間（例えば3スロット）の加算平均値X3をそれぞれ読み出してオフセット補正値ΔＰ（＝Y3−X3）を算出する(ステップ２０２)。ついで、次式
補正結果＝Ｐ＋ΔＰ
により補正結果を算出し(ステップ２０３)、該補正結果を測定レベルとして出力し(ステップ２０４)、最後に、現測定レベルが属するレベル範囲Ｌ３の測定時間Ｔ（＝3スロット）の加算平均X3を算出して、測定時間／平均値テーブルを更新する(ステップ２０５)。
第３実施例によれば、レベル測定結果である受信レベルの変動幅が大きい場合に精度をより高める事が可能となる。
また、第３実施例によれば、過去のレベル測定結果から受信電界強度が同等である場合の測定時間差による補正値を用いて補正するため、一回のコンプレストモードにて対象セルのレベル測定処理を一度しかしない状況において、測定レベルがフェージング等の影響を受けた場合でも過去の測定データを用いて補正するため、信頼度を向上でき、受信レベル比較の信頼性を向上することができる。 FIG. 11 is a processing flow of the control unit 13 in the third embodiment.
When the measurement result (measurement level P, measurement time T) is input (step 201), the reference measurement time (for example, 5 slots) of the level range (for example, L3) to which the current measurement level belongs from the measurement time / average value table (FIG. 9). ) average value Y 3 and offset correction value ΔP an average value X 3 reads each current measured level of the measurement time (e.g., 3 slots) in (= Y 3 -X 3) is calculated (step 202). Next, the following equation Correction result = P + ΔP
(Step 203), the correction result is output as a measurement level (step 204), and finally, the addition average X 3 of the measurement time T (= 3 slots) in the level range L3 to which the current measurement level belongs. And the measurement time / average value table is updated (step 205).
According to the third embodiment, it is possible to further improve the accuracy when the fluctuation range of the reception level as the level measurement result is large.
Further, according to the third embodiment, the level measurement of the target cell is performed in one compressed mode because the correction is performed using the correction value due to the measurement time difference when the received electric field strength is equal from the past level measurement result. In a situation where processing is performed only once, even when the measurement level is affected by fading or the like, correction is performed using past measurement data, so that the reliability can be improved and the reliability of the reception level comparison can be improved.

第1〜第３実施例では、測定レベルの補正を移動局で行なったが基地局側で行なうようにできる。図１２は基地局１が、移動局(移動端末)２より異周波測定結果Ｐとその際の測定時間Ｔを取得し、第１〜第３実施例により測定レベルの補正を行なう場合の説明図である。
図13は基地局１が、移動局２が測定時間別に算出した測定結果の加算平均値を取得し、第２〜第３実施例により測定レベルの補正を行なう場合の説明図である。 In the first to third embodiments, the correction of the measurement level is performed at the mobile station, but can be performed at the base station side. FIG. 12 is an explanatory diagram when the base station 1 acquires the different frequency measurement result P and the measurement time T at that time from the mobile station (mobile terminal) 2 and corrects the measurement level according to the first to third embodiments. It is.
FIG. 13 is an explanatory diagram in the case where the base station 1 acquires the average value of the measurement results calculated by the mobile station 2 for each measurement time and corrects the measurement level according to the second to third embodiments.

第５実施例は異周波レベル測定時の移動局の移動速度に着目し、移動速度毎にレベル測定時間による補正を行なう例である。図１４は第５実施例の制御部の機能ブロック図であり、図５の第1実施例と同一部分には同一符号を付している。異なる点は、(1)重み係数保存部３１に代えて速度別重み係数保存部37を設けた点、(2)移動速度検出部２４を設けた点、(3)重み係数決定部３２が移動局の移動速度Ｖおよび実測定時間Ｔに応じて重み係数α、βを決定して出力する点である。
速度別重み係数テーブルVWTLには、速度範囲別(0〜V0，V0〜V1，V1〜V2，…)に各測定時間(スロット数)に対応させて重み係数α、βを持たせている。重み係数決定部３２は、実際の移動速度Vが属する速度範囲のテーブルより実測定時間Ｔに応じた重み係数α、βを求めて各乗算器３３，３４に入力する。乗算部３３は現測定レベルＰに重み係数αを乗算し、乗算部３４は前回の測定レベルに重み係数βを乗算し、加算部３５は各乗算結果を加算し、加算結果を測定レベルとして出力し、遅延部３６は今回の測定レベルを、次回の測定レベルに対して前回の測定レベルとして出力する。
第５実施例によれば、移動しながら複数セルのレベル測定を行っているような場合、セル間の受信レベル測定結果に対する大小関係を精度良く行うことが可能となる。 The fifth embodiment focuses on the moving speed of the mobile station at the time of different frequency level measurement, and performs correction based on the level measurement time for each moving speed. FIG. 14 is a functional block diagram of the control unit of the fifth embodiment, and the same parts as those of the first embodiment of FIG. The difference is that (1) a speed-dependent weight coefficient storage unit 37 is provided instead of the weighting coefficient storage unit 31, (2) a moving speed detection unit 24 is provided, and (3) the weighting factor determination unit 32 is moved. The weighting factors α and β are determined and output according to the moving speed V of the station and the actual measurement time T.
The weighting factor table VWTL for each speed includes weighting factors α and β corresponding to each measurement time (number of slots) for each speed range ( 0 to V 0 , V 0 to V 1 , V 1 to V 2 ,...). I have it. The weighting coefficient determination unit 32 obtains weighting coefficients α and β corresponding to the actual measurement time T from the speed range table to which the actual moving speed V belongs and inputs the weighting coefficients α and β to the multipliers 33 and 34. The multiplication unit 33 multiplies the current measurement level P by the weighting factor α, the multiplication unit 34 multiplies the previous measurement level by the weighting factor β, the addition unit 35 adds each multiplication result, and outputs the addition result as a measurement level. The delay unit 36 outputs the current measurement level as the previous measurement level with respect to the next measurement level.
According to the fifth embodiment, when level measurement of a plurality of cells is performed while moving, the magnitude relationship with respect to the reception level measurement result between cells can be accurately performed.

第６実施例は異周波レベル測定時の移動局の移動速度に着目し、移動速度毎にレベル測定時間による補正を行なう別の例である。図１５は第６実施例の制御部の機能ブロック図であり、図６の第２実施例と同一部分には同一符号を付している。異なる点は、(1)測定時間／平均値保存部４１に、速度別測定時間／平均値テーブルVTATLを記憶する点、(2)移動速度検出部２４を設けた点、(3)重み係数更新／抽出部４２が、移動局の移動速度Ｖが属する速度範囲における基準測定時間の加算平均値と実測定時間Ｔの加算平均値をそれぞれテーブルVTATLより読み出してオフセット補正値算出部４３に入力する点である。
速度別測定時間／平均値テーブルVTATLは、速度範囲別(0〜V0，V0〜V1，V1〜V2，…)に、測定時間(スロット数)が同一の測定レベルを加算平均して測定時間別に保存している。たとえば、速度範囲0〜V0における測定時間3スロットの測定結果の加算平均値をＸ0として保存し、測定時間５スロットの測定結果の加算平均値をY0として保存し、測定時間７スロットの測定結果の加算平均値をＺ0として保存し、以下同様に各速度範囲の測定時間別平均値を記憶する。 The sixth embodiment is another example that pays attention to the moving speed of the mobile station at the time of measuring the different frequency level and performs correction by the level measuring time for each moving speed. FIG. 15 is a functional block diagram of the control unit of the sixth embodiment, and the same parts as those of the second embodiment of FIG. The difference is that (1) the measurement time / average value storage unit 41 stores the measurement time / average value table VTATL for each speed, (2) the moving speed detection unit 24 is provided, and (3) the weighting factor update. / Extraction unit 42 reads out the addition average value of the reference measurement time and the addition average value of the actual measurement time T in the speed range to which the moving speed V of the mobile station belongs, and inputs them to the offset correction value calculation unit 43. It is.
The measurement time / average value table VTATL for each speed averages the measurement levels with the same measurement time (number of slots) for each speed range ( 0 to V 0 , V 0 to V 1 , V 1 to V 2 , ...) And stored by measurement time. For example, the average value of the measurement results for the measurement time of 3 slots in the speed range 0 to V 0 is stored as X 0 , the average value of the measurement results for the measurement time of 5 slots is stored as Y 0 , and the measurement time of 7 slots is stored. The addition average value of the measurement results is stored as Z 0 , and the average value for each speed range for each speed range is stored in the same manner.

図１６は第6実施例の制御部１３の処理フローである。
測定結果(測定レベルＰ、測定時間Ｔ)が入力すると(ステップ３０１)、移動局の移動速度Ｖを取得し(ステップ３０２)、速度別測定時間／平均値テーブルVTATLの移動速度Ｖが属する速度範囲（V0〜V1とする）に応じた基準測定時間(5スロットとする)の加算平均値Y1と実測定時間(3スロットとする)の加算平均値X1をテーブルVTATLよりそれぞれ読み出して、オフセット補正値ΔＰ（＝Y1−X1）を算出する(ステップ３０３)。ついで、次式
補正結果＝Ｐ＋ΔＰ
により補正結果を算出し(ステップ３０４)、該補正結果を測定レベルとして出力し(ステップ３０５)、最後に、速度範囲（V0〜V1）における実測定時間Ｔの加算平均X1を算出して速度別測定時間／平均値テーブルVTATLを更新する(ステップ３０６)。
第６実施例によれば、移動しながら複数セルのレベル測定を行っているような場合で、セル間の受信レベル測定結果に対する大小関係を精度良く行うことが可能となる。 FIG. 16 is a processing flow of the control unit 13 of the sixth embodiment.
When the measurement result (measurement level P, measurement time T) is input (step 301), the moving speed V of the mobile station is acquired (step 302), and the speed range to which the moving speed V of the measurement time / average value table VTATL belongs. (V 0 ~V 1 to) the corresponding reference measurement time (5 slots and) average value Y 1 and the actual measuring time (a 3 slot) the average value X 1 reads each from the table VTATL of Then, an offset correction value ΔP (= Y 1 −X 1 ) is calculated (step 303). Next, the following equation Correction result = P + ΔP
By calculating the correction result (step 304), the correction result is output as a measurement level (step 305), and finally calculates the arithmetic mean X 1 real measurement time T in the speed range (V 0 ~V 1) Then, the measurement time / average value table VTATL for each speed is updated (step 306).
According to the sixth embodiment, it is possible to accurately perform the magnitude relation with respect to the reception level measurement result between cells in the case where the level measurement of a plurality of cells is performed while moving.

第7実施例は、異周波レベル測定時の移動局の移動速度に着目し、移動速度毎にレベル測定時間による補正を行なう更に別の例である。第6実施例と異なる点は、(1)速度範囲別に、レベル範囲毎に図９に示すテーブルを保存し、(2)実移動速度が属する速度範囲のテーブルであって、現測定レベルが属するレベル範囲の基準測定時間における加算平均値と現測定レベルの測定時間における加算平均値との差を補正値ΔＰとして演算し、(3)式により実際の測定レベルを補正して出力する点である。なお、ブロック構成は図１５の第６実施例と同じである。
図１７は第７実施例の制御部１３の処理フローである。
測定結果(測定レベルＰ、測定時間Ｔ)が入力すると(ステップ４０１)、移動局の移動速度Ｖを取得し(ステップ４０２)、実速度が属する速度範囲に応じた測定時間／平均値テーブルであって、現測定レベルが属するレベル範囲の基準測定時間の加算平均値と実測定時間Ｔの加算平均値をテーブルよりそれぞれ読み出して、オフセット補正値ΔＰを算出する(ステップ４０３)。ついで、次式
補正結果＝Ｐ＋ΔＰ
により補正結果を算出し(ステップ４０４)、該補正結果を測定レベルとして出力し(ステップ４０５)、最後に、前記速度範囲のテーブルであって、実測定レベルが属するレベル範囲の実測定時間Ｔの加算平均を算出して速度別測定時間／平均値テーブルを更新する(ステップ４０６)。 The seventh embodiment is yet another example in which correction is made based on the level measurement time for each moving speed, paying attention to the moving speed of the mobile station at the time of measuring different frequency levels. The difference from the sixth embodiment is that (1) the table shown in FIG. 9 is stored for each level range for each speed range, and (2) the speed range table to which the actual moving speed belongs, to which the current measurement level belongs. The difference between the addition average value at the reference measurement time of the level range and the addition average value at the measurement time of the current measurement level is calculated as a correction value ΔP, and the actual measurement level is corrected by equation (3) and output. . The block configuration is the same as that of the sixth embodiment shown in FIG.
FIG. 17 is a processing flow of the control unit 13 of the seventh embodiment.
When the measurement result (measurement level P, measurement time T) is input (step 401), the mobile station's moving speed V is acquired (step 402), and the measurement time / average value table corresponding to the speed range to which the actual speed belongs is obtained. Then, the addition average value of the reference measurement time and the addition average value of the actual measurement time T in the level range to which the current measurement level belongs are respectively read from the table to calculate the offset correction value ΔP (step 403). Next, the following equation Correction result = P + ΔP
(Step 404), and outputs the correction result as a measurement level (step 405). Finally, in the speed range table, the actual measurement time T of the level range to which the actual measurement level belongs is calculated. The addition average is calculated and the measurement time / average value table for each speed is updated (step 406).

第７実施例によれば、移動しながら複数セルのレベル測定を行っているような場合で、かつ、測定レベルの変動幅が大きい場合、セル間の受信レベル測定結果に対する大小関係を精度良く行うことが可能となる。
以上第５〜第７実施例によれば、速度毎の補正値を用いる事により、一定速度で移動する場合、あらゆる速度において精度良く補正を行うことができる。また、速度を変えながら移動するような場合においても、速度以外の条件を一致させた場合の補正値を比較する事で速度差による補正値を求める事ができ、この速度差による補正値を用いる事により、一定速度で移動する場合と同様に精度良く補正を行うことができる。また、移動速度差をなくすことにより、特に移動しながら複数セルのレベル測定を行っているような場合、セル間の受信レベル測定結果に対する大小関係を精度良く行うことが可能となる。 According to the seventh embodiment, when the level measurement of a plurality of cells is performed while moving and the fluctuation range of the measurement level is large, the magnitude relation with respect to the reception level measurement result between cells is accurately performed. It becomes possible.
As described above, according to the fifth to seventh embodiments, by using the correction value for each speed, when moving at a constant speed, the correction can be performed with high accuracy at any speed. Also, even when moving while changing the speed, a correction value based on the speed difference can be obtained by comparing the correction values when the conditions other than the speed are matched, and the correction value based on the speed difference is used. Thus, the correction can be performed with high accuracy as in the case of moving at a constant speed. Further, by eliminating the moving speed difference, it is possible to accurately perform the magnitude relationship with respect to the reception level measurement result between cells, particularly when the level measurement of a plurality of cells is performed while moving.

・変形例
以上の実施例は複数のコンプレストモードにおける複数回のレベル測定結果に対する場合であるが、一回のコンプレストモードにおいて、対象セルに対してレベル測定処理を複数回行い、その結果を用いて各実施例の補正処理を行なうことができる。
任意の基地局Aから近隣の基地局BあるいはCの内、受信電界強度の強い方にハンドオーバーするような状況において、基地局B、Cそれぞれのレベル測定を一度しか行わなかった場合、片方のレベル測定時に仮にフェージングの影響を受けた場合、測定結果である受信電界強度が低く見えてしまい、本来ハンドオーバーしたい基地局とは違う基地局にハンドオーバーする可能性がある。かかる場合、一回のコンプレストモード時に、対象セルに対して複数回レベル測定を実施し、各実施例の補正手法を用いて補正するようにすれば、受信電界強度の信頼性を高める事ができ、ハンドオーバー先の基地局を間違える可能性を低減できる。例えば、対象セル(複数)に対して一回しかレベル測定を行わなかった場合、基地局Bの受信電界強度の方が基地局Cの受信電界強度より大きいとすると、
RSSI_cell_b＞RSSI_cell_c
（RSSI_cell_b：基地局Bの受信電界強度、RSSI_cell_c：基地局Cの受信電界強度）
となる事が期待される。ところが、仮に基地局Bのレベル測定中にフェージングの影響を受けたとすれば、
RSSI_cell_b−RSSI_fd＜RSSI_cell_c
（RSSI_fd：フェージングによるロス分）
となる可能性があり、その結果、基地局Bにハンドオーバーするべきところを基地局Cに誤ってハンドオーバーする事になる。しかし、変形例のように、一回のコンプレストモード時において、対象セルに対してレベル測定処理を複数回行い、その結果を用いて各実施例の補正処理を行なうようにすれば、測定レベルの信頼性を向上してハンドオーバー先の基地局を間違える可能性を低減できる。 -Modified example The above embodiment is a case for a plurality of level measurement results in a plurality of compressed modes, but in one compressed mode, the level measurement process is performed a plurality of times on the target cell, and the result is The correction processing of each embodiment can be performed by using.
In a situation where handover is performed from an arbitrary base station A to a neighboring base station B or C having a higher received electric field strength, if the level measurement of each of the base stations B and C is performed only once, If the fading is affected at the time of level measurement, the received electric field strength, which is the measurement result, appears to be low, and there is a possibility that the base station is handed over to a base station different from the base station that is originally intended to be handed over. In such a case, it is possible to improve the reliability of the received electric field strength by performing level measurement multiple times on the target cell and correcting it using the correction method of each embodiment in one compressed mode. It is possible to reduce the possibility of mistaken handover destination base stations. For example, if the level measurement is performed only once for the target cell (plurality), if the received electric field strength of the base station B is greater than the received electric field strength of the base station C,
RSSI_cell_b> RSSI_cell_c
(RSSI_cell_b: received field strength of base station B, RSSI_cell_c: received field strength of base station C)
It is expected to become. However, if it is affected by fading during the level measurement of base station B,
RSSI_cell_b−RSSI_fd <RSSI_cell_c
(RSSI_fd: Loss due to fading)
As a result, a place to be handed over to the base station B is erroneously handed over to the base station C. However, if the level measurement process is performed a plurality of times on the target cell and the correction process of each embodiment is performed using the result in one compressed mode as in the modification, the measurement level Therefore, the possibility of mistaken handover destination base stations can be reduced.

・付記
（付記１） コンプレストモードにおいて通信中基地局の送信周波数と異なる送信周波数の基地局から受信する信号のレベルを測定する異周波測定方法において、
異周波測定時間に応じて測定レベルを補正する、
ことを特徴とする異周波測定方法。
（付記２） 前記補正は、レベル測定時間に応じて現測定レベルと過去の測定レベルにそれぞれ重み付けをし、重み付けされた現測定レベルと過去の測定レベルを加算し、加算結果を測定レベルとして出力することにより行なう、
ことを特徴とする付記1記載の異周波測定方法。
（付記３） コンプレストモードにおいて通信中基地局の送信周波数と異なる送信周波数の基地局から受信する信号のレベルを測定する異周波測定方法において、
測定時間が同一の測定レベルを加算平均して測定時間毎に保存し、
基準測定時間における加算平均値と現測定レベルの測定時間の加算平均値との差を補正値として演算し、
現測定レベルに前記補正値を加算し、加算結果を測定レベルとして出力する、
ことを特徴とする異周波測定方法。
（付記４）レベル範囲毎に測定時間が同一の測定レベルを加算平均して測定時間毎に保存し、現測定レベルが属するレベル範囲の基準測定時間における加算平均値と現測定レベルの測定時間の加算平均値との差を補正値として演算する、
ことを特徴とする付記３記載の異周波測定方法。
（付記５） 移動局より前記測定レベルと測定時間を取得して基地局にて、測定レベルの補正を行なう、
ことを特徴とする付記１乃至４記載の異周波測定方法。
（付記６） 移動局より前記加算平均値を取得して基地局にて、測定レベルの補正を行なう、
ことを特徴とする付記３乃至４記載の異周波測定方法。
（付記７）異周波測定時の移動局の移動速度を検出し、
移動速度別に前記測定レベルの補正を行なう、
ことを特徴とする付記１乃至４記載の異周波測定方法。
（付記８） コンプレストモードにおいて通信中基地局の送信周波数と異なる送信周波数の基地局から受信する信号のレベルを測定する異周波測定装置において、
現測定レベルと過去の測定レベルのそれぞれに付ける重み係数をレベル測定時間別に保存する重み係数保存部、
実際のレベル測定時間に応じた重み係数を前記重み係数保存部より求め、現測定レベルと過去の測定レベルにそれぞれ乗算して加算し、加算結果を測定レベルとして出力する測定レベル補正部、
を備えたことを特徴とする異周波測定装置。
（付記９）コンプレストモードにおいて通信中基地局の送信周波数と異なる送信周波数の基地局から受信する信号のレベルを測定する異周波測定装置において、
測定時間が同一の測定レベルを加算平均し、該加算平均を測定時間毎に保存する手段、
基準測定時間における加算平均値と現測定レベルの測定時間におけ加算平均値との差を補正値として演算する手段、
現測定レベルに前記補正値を加算し、加算結果を測定レベルとして出力する測定レベル補正手段、
を備えたことを特徴とする異周波測定装置。
（付記１０） 前記加算平均手段は、レベル範囲毎に測定時間が同一の測定レベルを加算平均して測定時間毎に保存し、前記補正値演算手段は現測定レベルが属するレベル範囲の基準測定時間における加算平均値と現測定レベルの測定時間における加算平均値との差を補正値として演算する、
ことを特徴とする付記９記載の異周波測定装置。
（付記１１） 異周波測定時の移動局の移動速度を検出する手段を備え、移動速度別に前記測定レベルの補正を行なう、
ことを特徴とする付記８乃至１０記載の異周波測定装置。 ・ Additional Note (Appendix 1) In a different frequency measurement method for measuring the level of a signal received from a base station having a transmission frequency different from the transmission frequency of the communicating base station in compressed mode,
Correct the measurement level according to the different frequency measurement time,
The different frequency measuring method characterized by the above-mentioned.
(Supplementary note 2) The correction weights the current measurement level and the past measurement level according to the level measurement time, adds the weighted current measurement level and the past measurement level, and outputs the addition result as the measurement level. To do,
The method for measuring different frequencies as described in appendix 1, wherein
(Additional remark 3) In the different frequency measurement method which measures the level of the signal received from the base station of the transmission frequency different from the transmission frequency of the communicating base station in the compressed mode,
The measurement levels with the same measurement time are averaged and stored for each measurement time.
The difference between the addition average value at the reference measurement time and the addition average value of the measurement time at the current measurement level is calculated as a correction value.
Add the correction value to the current measurement level and output the addition result as the measurement level.
The different frequency measuring method characterized by the above-mentioned.
(Supplementary Note 4) The measurement levels with the same measurement time for each level range are averaged and stored for each measurement time, and the average value of the reference measurement time of the level range to which the current measurement level belongs and the measurement time of the current measurement level are stored. Calculate the difference from the addition average value as a correction value.
The different frequency measuring method according to supplementary note 3, wherein
(Supplementary Note 5) The measurement level and measurement time are acquired from the mobile station and the measurement level is corrected at the base station.
The different frequency measurement method according to any one of supplementary notes 1 to 4, wherein:
(Supplementary Note 6) Obtain the above average value from the mobile station and correct the measurement level at the base station.
The different frequency measurement method according to any one of supplementary notes 3 to 4, characterized in that:
(Appendix 7) Detecting the moving speed of the mobile station when measuring different frequencies,
The measurement level is corrected for each moving speed.
The different frequency measurement method according to any one of supplementary notes 1 to 4, wherein:
(Additional remark 8) In the different frequency measuring apparatus which measures the level of the signal received from the base station of the transmission frequency different from the transmission frequency of the base station in communication in compressed mode,
A weighting factor storage unit that stores the weighting factor assigned to each of the current measurement level and the past measurement level for each level measurement time,
A weighting factor corresponding to the actual level measurement time is obtained from the weighting factor storage unit, multiplied by the current measurement level and the past measurement level, added, and a measurement level correction unit that outputs the addition result as a measurement level,
A different frequency measuring apparatus comprising:
(Additional remark 9) In the different frequency measuring apparatus which measures the level of the signal received from the base station of the transmission frequency different from the transmission frequency of the communicating base station in the compressed mode,
Means for averaging the measurement levels having the same measurement time and storing the average for each measurement time;
Means for calculating the difference between the addition average value at the reference measurement time and the addition average value at the measurement time of the current measurement level as a correction value;
Measurement level correction means for adding the correction value to the current measurement level and outputting the addition result as a measurement level;
A different frequency measuring apparatus comprising:
(Additional remark 10) The said addition average means adds and averages the measurement level with the same measurement time for every level range, and preserve | saves for every measurement time, The said correction value calculating means is the reference | standard measurement time of the level range to which the present measurement level belongs The difference between the addition average value in the measurement time and the addition average value in the measurement time of the current measurement level is calculated as a correction value.
The different frequency measuring device according to appendix 9, characterized in that.
(Supplementary Note 11) A means for detecting the moving speed of the mobile station at the time of different frequency measurement is provided, and the measurement level is corrected for each moving speed.
The different frequency measuring device according to any one of appendices 8 to 10, characterized in that.

本発明を適用する移動局の構成図である。It is a block diagram of the mobile station to which this invention is applied. RF部の構成図である。It is a block diagram of RF part. 移動速度検出部の構成図である。It is a block diagram of a moving speed detection part. レベル測定部の構成図である。It is a block diagram of a level measurement part. 第1実施例の異周波測定処理を行なう制御部の機能ブロック図である。FIG. 3 is a functional block diagram of a control unit that performs different frequency measurement processing of the first embodiment. 第２実施例の異周波測定処理を行なう制御部の機能ブロック図である。It is a functional block diagram of the control part which performs the different frequency measurement process of 2nd Example. 第２実施例の補正値説明図である。It is correction value explanatory drawing of 2nd Example. 第２実施例における制御部の処理フローである。It is a processing flow of the control part in 2nd Example. 第３実施例の測定時間／平均値テーブルである。It is a measurement time / average value table of 3rd Example. 第３実施例のレベル毎、測定時間毎のオフセット補正値説明図である。It is offset correction value explanatory drawing for every level of every 3rd Example, and measurement time. 第３実施例における制御部の処理フローである。It is a processing flow of the control part in 3rd Example. 基地局が、移動局より異周波測定結果とその際の測定時間を取得し、第１〜第３実施例により測定レベルの補正を行なう場合の第４実施例の説明図である。It is explanatory drawing of 4th Example in case a base station acquires the different frequency measurement result and the measurement time in that case from a mobile station, and correct | amends a measurement level by 1st-3rd Example. 基地局が、移動局より、測定時間別に算出した測定結果の加算平均値を取得し、第２〜第３実施例により測定レベルの補正を行なう場合の第４実施例の説明図である。It is explanatory drawing of 4th Example when a base station acquires the addition average value of the measurement result calculated according to measurement time from the mobile station, and correct | amends a measurement level by 2nd-3rd Example. 第５実施例の制御部の機能ブロック図である。It is a functional block diagram of the control part of 5th Example. 第６実施例の制御部の機能ブロック図である。It is a functional block diagram of the control part of 6th Example. 第6実施例の制御部の処理フローである。It is a processing flow of the control part of 6th Example. 第７実施例の制御部の処理フローである。It is a processing flow of the control part of 7th Example. コンプレストモードの説明図である。It is explanatory drawing of compressed mode. コンプレストモードにおいて網側より送信されるパラメータ説明図である。It is parameter explanatory drawing transmitted from the network side in compressed mode.

符号の説明Explanation of symbols

３１ 重み係数保存部
３２ 重み係数決定部
３３，３４ 乗算部
３５ 加算部
３６ 遅延部
31 Weight coefficient storage unit 32 Weight coefficient determination unit 33, 34 Multiplication unit 35 Addition unit 36 Delay unit

Claims (5)

コンプレストモードにおいて通信中基地局の送信周波数と異なる送信周波数の基地局から受信する信号のレベルを測定する異周波測定方法において、
異周波測定時間に応じて測定レベルを補正する、
ことを特徴とする異周波測定方法。 In the different frequency measurement method for measuring the level of a signal received from a base station having a transmission frequency different from the transmission frequency of the communicating base station in the compressed mode,
Correct the measurement level according to the different frequency measurement time,
The different frequency measuring method characterized by the above-mentioned. 前記補正は、レベル測定時間に応じて現測定レベルと過去の測定レベルにそれぞれ重み付けをし、重み付けされた現測定レベルと過去の測定レベルを加算し、加算結果を測定レベルとして出力することにより行なう、
ことを特徴とする請求項1記載の異周波測定方法。 The correction is performed by weighting the current measurement level and the past measurement level according to the level measurement time, adding the weighted current measurement level and the past measurement level, and outputting the addition result as the measurement level. ,
2. The different frequency measuring method according to claim 1, wherein: コンプレストモードにおいて通信中基地局の送信周波数と異なる送信周波数の基地局から受信する信号のレベルを測定する異周波測定方法において、
測定時間が同一の測定レベルを加算平均して測定時間毎に保存し、
基準測定時間における加算平均値と現測定レベルの測定時間の加算平均値との差を補正値として演算し、
現測定レベルに前記補正値を加算し、加算結果を測定レベルとして出力する、
ことを特徴とする異周波測定方法。 In the different frequency measurement method for measuring the level of a signal received from a base station having a transmission frequency different from the transmission frequency of the communicating base station in the compressed mode,
The measurement levels with the same measurement time are averaged and stored for each measurement time.
The difference between the addition average value at the reference measurement time and the addition average value of the measurement time at the current measurement level is calculated as a correction value.
Add the correction value to the current measurement level and output the addition result as the measurement level.
The different frequency measuring method characterized by the above-mentioned. レベル範囲毎に測定時間が同一の測定レベルを加算平均して測定時間毎に保存し、現測定レベルが属するレベル範囲の基準測定時間における加算平均値と現測定レベルの測定時間の加算平均値との差を補正値として演算する、
ことを特徴とする請求項３記載の異周波測定方法。 The measurement levels with the same measurement time for each level range are averaged and stored for each measurement time. The average addition value at the reference measurement time of the level range to which the current measurement level belongs and the average addition value of the measurement time at the current measurement level To calculate the difference between
The method for measuring different frequencies according to claim 3. 異周波測定時の移動局の移動速度を検出し、
移動速度別に前記測定レベルの補正を行なう、
ことを特徴とする請求項１乃至４記載の異周波測定方法。 Detect the moving speed of the mobile station when measuring different frequencies,
The measurement level is corrected for each moving speed.
5. The method for measuring different frequencies according to claim 1, wherein:
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