JP2000049689A - Interference signal power measuring method - Google Patents
Interference signal power measuring methodInfo
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- JP2000049689A JP2000049689A JP21592798A JP21592798A JP2000049689A JP 2000049689 A JP2000049689 A JP 2000049689A JP 21592798 A JP21592798 A JP 21592798A JP 21592798 A JP21592798 A JP 21592798A JP 2000049689 A JP2000049689 A JP 2000049689A
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- Prior art keywords
- signal power
- interference signal
- interference
- pilot symbol
- estimated
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Abstract
Description
【０００１】[0001]
【発明の属する技術分野】本発明は、ＣＤＭＡ（Code D
ivision Multiple Access ：符号分割多元接続）方式を
利用した移動通信システムにおいて、受信ＳＩＲ（Sign
al-to-Interference plus noise power Ratio ：希望波
対干渉波電力比）を測定する際の干渉信号電力測定方法
に関する。The present invention relates to a CDMA (Code D)
In a mobile communication system using an ivision Multiple Access (code division multiple access) method, a reception SIR (Sign
The present invention relates to a method for measuring an interference signal power when measuring an al-to-interference plus noise power ratio.
【０００２】ＣＤＭＡ方式を利用した移動通信システム
において、送信側では、音声等の情報をユーザに固有の
拡散符号で拡散し、拡散された信号を同じ周波数帯で重
ね合わせて送信する（スペクトル拡散方式の特徴）。ま
た、受信側では、この拡散符号によりユーザを識別でき
る。ＣＤＭＡ方式においては、スペクトル利用効率が高
い、秘話性が高い、周波数管理が容易、ソフトハンドオ
ーバが可能等の長所を有するが、遠い局から受信した希
望信号に干渉する近い局からの信号により、通話品質が
劣化するという状況が発生するため、高精度の送信電力
制御が必要となっている。2. Description of the Related Art In a mobile communication system using a CDMA system, a transmitting side spreads information such as voice with a spreading code peculiar to a user, and superimposes spread signals in the same frequency band and transmits them (spectrum spreading method). Features). On the receiving side, the user can be identified by the spreading code. The CDMA system has advantages such as high spectrum utilization efficiency, high confidentiality, easy frequency management, and soft handover. However, a signal from a nearby station that interferes with a desired signal received from a distant station is used. Since a situation occurs in which the quality deteriorates, high-precision transmission power control is required.
【０００３】[0003]
【従来の技術】以下、ＣＤＭＡ方式を利用した移動通信
システムにおいて、受信ＳＩＲを測定する際の、従来の
干渉信号電力測定方法について説明する。ＣＤＭＡ方式
では、同一の周波数帯域を複数のユーザが共有するた
め、他のユーザからの信号が干渉信号となり、自分のチ
ャネルの通信品質が劣化するという状況が発生する。2. Description of the Related Art A conventional method for measuring the power of an interference signal when measuring a reception SIR in a mobile communication system using the CDMA system will be described below. In the CDMA system, since the same frequency band is shared by a plurality of users, a signal from another user becomes an interference signal, and a situation occurs in which the communication quality of its own channel deteriorates.
【０００４】具体的にいうと、基地局の近くの移動局
と、遠くの移動局とが同時に通信を行う場合、基地局で
は、近くの移動局からの送信信号を高電力で受信し、遠
くの移動局からの送信信号を低電力で受信する。この場
合、遠くの移動局と基地局との通信は、近くの移動局か
らの干渉を受けて、通信品質が劣化するという問題、即
ち、遠近問題が発生する。この時、下りチャネルでは、
希望信号と干渉信号が同じ伝搬経路で受信されるため、
干渉の影響はそれ程大きくないが、上りチャネルでは、
各移動局が同一の電力で送信信号を送信すると、遠くの
移動局の送信信号が近くの移動局の送信信号（干渉）の
影響を受けやすい。[0004] More specifically, when a mobile station near the base station and a mobile station far away from each other simultaneously communicate, the base station receives a transmission signal from the mobile station near the base station with high power, and receives a signal from the mobile station near the base station. Of the mobile station with low power. In this case, the communication between the distant mobile station and the base station suffers from interference from the nearby mobile station, causing a problem that the communication quality is deteriorated, that is, a near-far problem. At this time, in the downlink channel,
Since the desired signal and the interference signal are received on the same propagation path,
The effect of the interference is not significant, but in the uplink channel,
When each mobile station transmits a transmission signal with the same power, the transmission signal of a distant mobile station is easily affected by the transmission signal (interference) of a nearby mobile station.
【０００５】この遠近問題を解決する技術としては、基
地局での受信電力が近くの移動局と遠くの移動局とで同
一になるように各移動局の送信電力を制御する送信電力
制御（transmission power control）がある。即ち、送
信電力制御とは、受信局（基地局または移動局）が受信
する受信電力、または受信電力から求められる希望信号
対干渉信号電力比（以後、ＳＩＲという）が、各移動局
の所在位置にかかわらず一定になるように送信電力を制
御するものである。As a technique for solving the near-far problem, transmission power control (transmission power) for controlling the transmission power of each mobile station so that the reception power at the base station is the same between the near mobile station and the far mobile station. power control). That is, the transmission power control means that the received power received by the receiving station (base station or mobile station) or the desired signal-to-interference signal power ratio (hereinafter referred to as SIR) obtained from the received power is determined by the location of each mobile station. The transmission power is controlled to be constant regardless of the transmission power.
【０００６】図１は、既知であるパイロット信号（パイ
ロットシンボル）を用いた同期検波を行う場合の信号構
成例を示す。即ち、パイロットシンボル２が所定間隔で
情報シンボル１に挿入されている信号のフレーム構成を
示す。尚、パイロットシンボル間の１周期はスロットと
呼ばれる（図示のスロット３ａ、３ｂ、３ｃ・・・を示
す）。FIG. 1 shows an example of a signal configuration in the case of performing synchronous detection using a known pilot signal (pilot symbol). That is, it shows a frame configuration of a signal in which pilot symbols 2 are inserted into information symbols 1 at predetermined intervals. One cycle between pilot symbols is called a slot (indicated by slots 3a, 3b, 3c,... In the drawing).
【０００７】基地局側では、特に上りチャネルにおける
送信電力制御を実現するため、スロット毎に上記ＳＩＲ
の測定を行う。尚、ＳＩＲは、基地局側へ到着する各到
着パスの各受信データシンボルにおける振幅の実測値を
用いて測定される。図２は、ＣＤＭＡ方式を利用した移
動通信システムにおいて、所定スロットの干渉信号電力
を測定する従来の干渉信号電力測定方法を示す。On the base station side, in order to realize transmission power control particularly in the uplink channel, the SIR is used for each slot.
Measurement. The SIR is measured using the measured value of the amplitude of each received data symbol of each arrival path arriving at the base station. FIG. 2 shows a conventional interference signal power measuring method for measuring the interference signal power of a predetermined slot in a mobile communication system using the CDMA system.
【０００８】尚、基地局側へ到着するパスの総数をＬと
する場合、例えば、ユーザ番号ｕ、スロット番号ｋ、シ
ンボル番号ｍ（受信するシンボルの総数Ｍ）、到着パス
番号ｌである複数の受信データシンボル（複素数値）の
推定値をWhen the total number of paths arriving at the base station is L, for example, a plurality of user numbers u, slot numbers k, symbol numbers m (total number M of received symbols), and arrival path numbers 1 Estimate the received data symbol (complex value)
【０００９】[0009]
【数１】 (Equation 1)
【００１０】とする。また、内挿補間によって得られる
フェージング・エンベロープの推定値は、It is assumed that: Also, the estimated value of the fading envelope obtained by interpolation is
【００１１】[0011]
【数２】 (Equation 2)
【００１２】となる。例えば、基地局において、パス番
号１〜Ｌの到着パスの受信データシンボルを受信する
と（Ｓ１０１）、該基地局では、観測した受信データシ
ンボルを、上記フェージング・エンベロープの推定値
により重み付け合成し、その結果として、情報シンボ
ル## EQU1 ## For example, when the base station receives the received data symbols of the arrival paths with path numbers 1 to L (S101), the base station weights and combines the observed received data symbols with the fading envelope estimation value, and As a result, the information symbol
【００１３】[0013]
【数３】 (Equation 3)
【００１４】を計算する（Ｓ１０２）（図４、従来手法
の実施例参照）。ただし、＊は複素共役を示す。更に、
基地局では、全情報シンボルの平均値(S102) (see FIG. 4, an embodiment of the conventional method). Here, * indicates a complex conjugate. Furthermore,
At the base station, the average value of all information symbols
【００１５】[0015]
【数４】 (Equation 4)
【００１６】を計算し、前記複数の受信データシンボル
と該平均値との差分の２乗の平均値を計算する。前記差
分の２乗の平均値は、The average of the square of the difference between the plurality of received data symbols and the average is calculated. The average value of the square of the difference is
【００１７】[0017]
【数５】 (Equation 5)
【００１８】にて求められる（図４、従来手法の実施例
参照）。基地局では、この差分の２乗の平均値を計算
することにより、干渉成分を推定する（Ｓ１０３）。最
後に、基地局は、上記干渉成分の推定値、即ち、前記差
分の２乗の平均値を複数スロットにわたり平均化し
（Ｓ１０４）、その平均値を、所定スロットにおける干
渉信号電力の推定値としている（Ｓ１０５）（図４、従
来手法の実施例参照）。(See FIG. 4, an embodiment of the conventional method). The base station estimates the interference component by calculating the average value of the square of the difference (S103). Finally, the base station averages the estimated value of the interference component, that is, the average value of the square of the difference over a plurality of slots (S104), and uses the average value as the estimated value of the interference signal power in a predetermined slot. (S105) (see FIG. 4, an example of the conventional method).
【００１９】例えば、複数のスロットを平均化する計算
方法の一例として、忘却係数α（但し、αは１よりわず
かに小さな一定値）のローパスフィルタを使用した場
合、上記干渉成分の推定値の複数スロットにわたる平
均値、即ち、所定スロットにおける干渉信号電力の推定
値は、For example, as an example of a calculation method for averaging a plurality of slots, when a low-pass filter having a forgetting factor α (where α is a fixed value slightly smaller than 1) is used, a plurality of estimated values of the interference component are obtained. The average over the slot, i.e., the estimate of the interference signal power in a given slot, is
【００２０】[0020]
【数６】 (Equation 6)
【００２１】のように、計算することができる。The calculation can be performed as follows.
【００２２】[0022]
【発明が解決しようとする課題】しかしながら、移動通
信システムでは、移動局が、例えば、伝送路での減衰が
大きなビル影等の場所と、伝送路での減衰が小さい場所
とを相互に移動することによって、伝送路の利得が急激
に変化することがある。尚、前記ビル影等から出た状態
は、見通し状態と呼ばれる。However, in the mobile communication system, the mobile station moves between, for example, a place where the attenuation on the transmission path is large, such as a building shadow, and a place where the attenuation on the transmission path is small. As a result, the gain of the transmission path may change rapidly. The state of the building coming out of the shadow or the like is called a line-of-sight state.
【００２３】従来の干渉信号電力測定方法においては、
観測した受信データシンボルを（図２、Ｓ１０１参
照）、上記フェージング・エンベロープの推定値により
重み付け合成して情報シンボルを求め（Ｓ１０２）、更
に受信データシンボルと全情報シンボルの平均値とから
干渉成分を推定し（Ｓ１０３）、この干渉成分の推定値
を複数スロットにわたり平均化することにより（Ｓ１０
４）、所定スロットにおける干渉信号電力の推定値を測
定している（Ｓ１０５）。この場合、フェージング・エ
ンベローブは見通し状態の有無により大きく変動するた
め、測定される干渉信号電力の推定値は、移動局が見通
し状態に移動すると緩やかに上がり、見通し状態が終了
すると緩やかに下がることになる。即ち、見通し状態が
終了した場合でも、フェージング・エンベロープにより
重み付けされた干渉信号電力は、緩やかに下がることと
なり、本来の値に追随して急激に変化しない。In the conventional interference signal power measuring method,
Observed received data symbols (see S101 in FIG. 2) are weighted and combined with the fading envelope estimation value to obtain information symbols (S102). Further, interference components are obtained from the received data symbols and the average value of all information symbols. By estimating (S103) and averaging the estimated value of the interference component over a plurality of slots (S10)
4) The estimated value of the interference signal power in the predetermined slot is measured (S105). In this case, since the fading envelope fluctuates greatly depending on the presence or absence of the line-of-sight state, the estimated value of the measured interference signal power gradually increases when the mobile station moves to the line-of-sight state, and gradually decreases when the mobile station ends. Become. That is, even when the line-of-sight state ends, the interference signal power weighted by the fading envelope gradually decreases, and does not rapidly change following the original value.
【００２４】その結果、上記のような場合に、干渉信号
電力の推定値の誤差が大きくなってしまうというという
問題点がある。そこで、本発明は、上記課題を解決し、
移動局がビル影から見通し状態に移動する等の伝送路の
利得が急激に変化する時の、干渉信号電力の測定精度の
向上を実現可能な干渉信号電力測定方法を提供すること
を目的とする。As a result, in the above case, there is a problem that the error of the estimated value of the interference signal power becomes large. Then, the present invention solves the above-mentioned problems,
It is an object of the present invention to provide an interference signal power measurement method capable of improving the measurement accuracy of interference signal power when the gain of a transmission line suddenly changes, for example, when a mobile station moves from a building shadow to a line of sight. .
【００２５】[0025]
【課題を解決するための手段】そこで、上記課題を解決
するため、本発明の干渉信号電力測定方法では、請求項
１に記載のように、複数のパイロットシンボル（図１に
示すパイロットシンボル２に相当）が所定間隔で情報シ
ンボル（図１に示す情報シンボル１に相当）に挿入され
ている複数の到着パス（図１に示す信号構成に相当）を
用いて、干渉信号電力を測定する移動通信システムの干
渉信号電力測定方法において、受信局は、到着する前記
各到着パス毎に、各パイロットシンボル区間における複
数の受信データシンボルを受信する受信ステップ（後述
する実施例のステップＳ１に相当）と、前記複数の受信
データシンボルに基づいて、各パイロットシンボル区間
における干渉成分を推定する干渉成分推定ステップ（後
述する実施例のステップＳ２に相当）と、前記各パイロ
ットシンボル区間毎に推定された干渉成分に基づいて、
各到着パスにおける干渉信号電力を推定するパス干渉信
号電力推定ステップ（後述する実施例のステップＳ３に
相当）とを有し、その後、前記各到着パス毎に推定され
た干渉信号電力を合成することにより、合成されたパイ
ロットシンボル区間の干渉信号電力を推定する合成干渉
信号電力推定ステップ（後述する実施例のステップＳ
４、Ｓ５に相当）を有することを特徴とする。請求項１
記載の発明では、干渉信号電力の測定精度の向上を実現
可能な具体的な干渉信号電力測定方法を規定する。Therefore, in order to solve the above-mentioned problems, according to the interference signal power measuring method of the present invention, a plurality of pilot symbols (the pilot symbol 2 shown in FIG. Mobile communication for measuring interference signal power using a plurality of arrival paths (corresponding to the signal configuration shown in FIG. 1) in which information symbols (corresponding to) are inserted into information symbols (corresponding to information symbol 1 shown in FIG. 1) at predetermined intervals. In the system interference signal power measuring method, a receiving station receives a plurality of received data symbols in each pilot symbol section for each of the arriving paths (corresponding to step S1 in an embodiment described later), An interference component estimating step of estimating an interference component in each pilot symbol section based on the plurality of received data symbols (a step in an embodiment described later); And Tsu corresponds to flop S2), based on the estimated interference component wherein each pilot symbol interval,
Estimating the interference signal power in each arrival path (corresponding to step S3 in an embodiment described later), and thereafter, combining the interference signal power estimated for each arrival path. , A combined interference signal power estimation step of estimating the interference signal power in the combined pilot symbol section (step S
4, equivalent to S5). Claim 1
In the described invention, a specific interference signal power measurement method capable of improving the measurement accuracy of the interference signal power is specified.
【００２６】本発明の干渉信号電力測定方法では、測定
される干渉信号電力の推定値は、移動局が見通し状態に
移動するとそれに対応して速やかに上がり、見通し状態
が終了するとそれに対応して速やかに下がることにな
る。即ち、本来の干渉信号電力に追随して速やかに変化
する。従って、本発明の干渉信号電力測定方法において
は、移動局がビル影から見通し状態に移動する等の伝送
路の利得が急激に変化する時の、干渉信号電力の測定精
度の向上を実現することができる。In the interference signal power measuring method of the present invention, the estimated value of the measured interference signal power rises correspondingly when the mobile station moves to the line-of-sight state, and rapidly increases when the line-of-sight state ends. Will fall. That is, it changes quickly following the original interference signal power. Therefore, in the interference signal power measuring method of the present invention, it is possible to improve the measurement accuracy of the interference signal power when the gain of the transmission path changes abruptly, for example, when the mobile station moves from the building to the line of sight. Can be.
【００２７】また、請求項２記載の発明において、請求
項１記載の干渉信号電力測定方法の干渉成分推定ステッ
プは、前記各パイロットシンボル区間における複数の受
信データシンボルの平均値を計算し（後述する実施例の
’式に相当）、前記複数の受信データシンボルと前記
平均値との差分を計算し、更に前記差分の２乗の平均値
を計算することにより（後述する実施例の’式に相
当）、各パイロットシンボル区間における干渉成分を推
定することを特徴とする。請求項２記載の発明では、各
パイロットシンボル区間における干渉成分を推定するた
めの、具体的な計算方法の一例を規定する。In the invention according to claim 2, the interference component estimating step of the interference signal power measuring method according to claim 1 calculates an average value of a plurality of received data symbols in each pilot symbol section (described later). By calculating the difference between the plurality of received data symbols and the average value, and calculating the average value of the square of the difference (corresponding to the expression in the embodiment) (corresponding to the expression in the embodiment described later). ), An interference component in each pilot symbol section is estimated. According to the second aspect of the present invention, an example of a specific calculation method for estimating an interference component in each pilot symbol section is defined.
【００２８】また、請求項３記載の発明において、請求
項２記載の干渉信号電力測定方法のパス干渉信号電力推
定ステップは、各パイロットシンボル区間毎に推定され
た干渉成分である前記差分の２乗の平均値の、各到着パ
スの複数パイロットシンボル区間にわたる平均値を計算
することにより（後述する実施例の’式に相当）、各
到着パスにおける干渉信号電力を推定することを特徴と
する。請求項３記載の発明では、各到着パスにおける干
渉信号電力を推定するための、具体的な計算方法の一例
を規定する。In the third aspect of the present invention, the step of estimating the path interference signal power in the interference signal power measurement method according to the second aspect includes the square of the difference being the interference component estimated for each pilot symbol section. The interference signal power in each arrival path is estimated by calculating the average value of the average value over a plurality of pilot symbol sections of each arrival path (corresponding to the expression 'in the embodiment described later). According to the third aspect of the present invention, an example of a specific calculation method for estimating the interference signal power in each arrival path is defined.
【００２９】また、請求項４記載の発明において、請求
項３記載の干渉信号電力測定方法の合成干渉信号電力推
定ステップは、前記各到着パスの複数パイロットシンボ
ル区間にわたる平均値に、内挿補間により得られるフェ
ージング・エンベロープを乗算し、前記乗算で得られた
乗算値を全ての到着パスにわたり積算することにより
（後述する実施例の’式に相当）、前記各到着パス毎
に推定された干渉信号電力を合成することを特徴とす
る。請求項４記載の発明では、各到着パス毎に推定され
た干渉信号電力を合成するための、具体的な計算方法の
一例を規定する。Further, in the invention according to claim 4, the step of estimating a combined interference signal power in the interference signal power measurement method according to claim 3 comprises interpolating an average value over a plurality of pilot symbol sections of each arrival path by interpolation. The interference signal estimated for each of the arrival paths is multiplied by the obtained fading envelope and integrated by multiplying the multiplication value obtained by the multiplication over all the arrival paths (corresponding to the equation (1) in the embodiment described later). It is characterized by combining power. According to the fourth aspect of the present invention, an example of a specific calculation method for combining interference signal powers estimated for each arrival path is defined.
【００３０】[0030]
【発明の実施の形態】以下、ＣＤＭＡ方式を利用した移
動通信システムにおいて、受信ＳＩＲ（Signal-to-Inte
rference plus noise power Ratio ：希望波対干渉波電
力比）を測定する際の、本発明の干渉信号電力測定方法
の実施例を、図面に基づいて説明する。BEST MODE FOR CARRYING OUT THE INVENTION In a mobile communication system using a CDMA system, a reception SIR (Signal-to-Inte
An embodiment of the interference signal power measuring method of the present invention when measuring a desired signal to interference wave power ratio (ratio plus noise power ratio) will be described with reference to the drawings.
【００３１】ＣＤＭＡ方式において、基地局の近くの移
動局と、遠くの移動局とが同時に通信を行う場合、基地
局では、近くの移動局からの送信信号を高電力で受信
し、遠くの移動局からの送信信号を低電力で受信する。
この場合、遠くの移動局と基地局との通信は、近くの移
動局からの干渉を受けて、通信品質が劣化するという遠
近問題が発生する。この時、下りチャネルでは、希望信
号と干渉信号が同じ伝搬経路で受信されるため、干渉の
影響はそれ程大きくないが、上りチャネルでは、各移動
局が同一の電力で送信信号を送信すると、遠くの移動局
の送信信号が近くの移動局の送信信号（干渉）の影響を
受けやすい。In the CDMA system, when a mobile station near a base station and a remote mobile station communicate simultaneously, the base station receives a transmission signal from a mobile station near the base station with high power and moves to a remote mobile station. A transmission signal from a station is received with low power.
In this case, communication between a distant mobile station and a base station suffers from a near-far problem that communication quality deteriorates due to interference from a nearby mobile station. At this time, in the downlink channel, since the desired signal and the interference signal are received on the same propagation path, the influence of the interference is not so large. However, in the uplink channel, if each mobile station transmits a transmission signal with the same power, it will be far away. Are easily affected by transmission signals (interference) of nearby mobile stations.
【００３２】この遠近問題を解決する技術としては、基
地局での受信電力が近くの移動局と遠くの移動局とで同
一になるように各移動局の送信電力を制御する送信電力
制御がある。基地局側では、特に上りチャネルにおける
送信電力制御を実現するため、スロット毎に上記ＳＩＲ
の測定を行う。この時、測定されるＳＩＲは、基地局側
へ到着する各到着パスの各受信データシンボルの実測値
を用いて測定される。As a technique for solving the near-far problem, there is transmission power control for controlling the transmission power of each mobile station so that the received power at the base station is the same between the near mobile station and the far mobile station. . On the base station side, in order to realize transmission power control especially in the uplink channel, the SIR
Measurement. At this time, the measured SIR is measured using the measured value of each received data symbol of each arrival path arriving at the base station.
【００３３】具体的にいうと、測定されるＳＩＲは、希
望信号の電力値（推定値）と干渉信号の電力値（推定
値）との比を計算することにより求められる。尚、ここ
でいう希望信号の電力値とは、内挿補間により求められ
るフェージング・エンベロープを所定のスロット単位で
平均することにより求められる電力値と定義する。図１
は、従来の技術にて説明した通り、既知であるパイロッ
トシンボル２が所定間隔で情報シンボル１に挿入されて
いる信号のフレーム構成を示す。本発明においても、従
来と同様にこの信号に基づいて、スロットの干渉信号電
力を測定する。More specifically, the measured SIR is obtained by calculating the ratio between the power value (estimated value) of the desired signal and the power value (estimated value) of the interference signal. Here, the power value of the desired signal is defined as a power value obtained by averaging a fading envelope obtained by interpolation in a predetermined slot unit. FIG.
Indicates a frame configuration of a signal in which known pilot symbols 2 are inserted into information symbols 1 at predetermined intervals, as described in the related art. Also in the present invention, the interference signal power of the slot is measured based on this signal as in the conventional case.
【００３４】図２は、ＣＤＭＡ方式を利用した移動通信
システムにおいて、所定スロットの干渉信号電力を測定
する本発明の干渉信号電力測定方法の一例を示す。尚、
基地局側へ到着するパスの総数をＬとする場合、例え
ば、ユーザ番号ｕ、スロット番号ｋ、シンボル番号ｍ
（総数Ｍ）、到着パス番号ｌである複数の受信データシ
ンボル（複素数値）の推定値をFIG. 2 shows an example of the interference signal power measuring method of the present invention for measuring the interference signal power of a predetermined slot in a mobile communication system using the CDMA system. still,
When the total number of paths arriving at the base station is L, for example, user number u, slot number k, symbol number m
(Total M), the estimated values of a plurality of received data symbols (complex values) with the arrival path number l
【００３５】[0035]
【数７】 (Equation 7)
【００３６】とする（図４、本発明の実施例参照）。ま
た、内挿補間によって得られるフェージング・エンベロ
ープの推定値は、(See FIG. 4, an embodiment of the present invention.) Also, the estimated value of the fading envelope obtained by interpolation is
【００３７】[0037]
【数８】 (Equation 8)
【００３８】となる。例えば、基地局は、パス番号１〜
Ｌ（Ｌは任意の整数）の到着パス毎に、各パイロットシ
ンボル区間（以後、スロットという）における複数の受
信データシンボル’を受信する（Ｓ１）。尚、本実施
例では、シンボル区間ｍ＝１，２，３，・・・，Ｍにつ
いて受信する。## EQU4 ## For example, the base station has path numbers 1 to
For each of the L (L is an arbitrary integer) arrival paths, a plurality of received data symbols ′ in each pilot symbol section (hereinafter referred to as a slot) are received (S1). In this embodiment, the reception is performed for the symbol sections m = 1, 2, 3,..., M.
【００３９】次に、基地局では、パス番号１〜Ｌの到着
パス毎に受信した前記複数の受信データシンボル’に
基づいて、各スロットにおける干渉成分の推定を行う
（Ｓ２）。第１に、基地局では、各スロットにおける前
記複数の受信データシンボル’の平均値を計算する。
各スロットにおける前記複数の受信データシンボル’
の平均値は、Next, the base station estimates an interference component in each slot based on the plurality of received data symbols' received for each of the arrival paths of path numbers 1 to L (S2). First, the base station calculates an average value of the plurality of received data symbols' in each slot.
The plurality of received data symbols in each slot
The average of
【００４０】[0040]
【数９】 (Equation 9)
【００４１】を計算することにより求めることができ
る。第２に、前記複数の受信データシンボルと平均値
’との差分を計算し、更にその差分の２乗の平均値を
計算する。前記差分の２乗の平均値は、Can be obtained by calculating Second, the difference between the plurality of received data symbols and the average value 'is calculated, and the average value of the square of the difference is calculated. The average value of the square of the difference is
【００４２】[0042]
【数１０】 (Equation 10)
【００４３】を計算することにより求めることができる
（図４、本発明の実施例参照）。基地局では、この平均
値’を各スロットにおける干渉成分の推定値とする。
次に基地局では、各スロット毎に推定された干渉成分に
基づいて、即ち、平均値’に基づいて、各到着パスに
おける干渉信号電力を推定する（Ｓ３）。各到着パスに
おける干渉信号電力は、各スロット毎に推定された干渉
成分である前記差分の２乗の平均値’を複数スロット
にわたり平均化することにより推定することができる。Can be obtained by calculating (see FIG. 4, embodiment of the present invention). In the base station, this average value is used as an estimated value of the interference component in each slot.
Next, the base station estimates the interference signal power in each arrival path based on the interference component estimated for each slot, that is, based on the average value '(S3). The interference signal power in each arrival path can be estimated by averaging the average value of the square of the difference, which is the interference component estimated for each slot, over a plurality of slots.
【００４４】例えば、複数スロットを平均化する計算方
法の一例として、忘却係数α（但し、αは１よりわずか
に小さな一定値）のローパスフィルタを使用した場合、
上記各到着パスにおける干渉信号電力の推定値は、For example, as an example of a calculation method for averaging a plurality of slots, when a low-pass filter having a forgetting factor α (where α is a fixed value slightly smaller than 1) is used,
The estimated value of the interference signal power in each arrival path is
【００４５】[0045]
【数１１】 [Equation 11]
【００４６】のように、計算することができる。これに
より、Ｌ個の干渉信号電力の推定値が得られる。その
後、基地局では、各到着パス毎に推定されたＬ個の干渉
信号電力’をフェージング・エンベロープによって合
成することにより（Ｓ４）、合成されたスロットの干渉
信号電力を推定する（Ｓ５）。具体的にいうと、各到着
パス毎に推定された干渉信号電力’に、内挿補間によ
り得られるフェージング・エンベロープを乗算し、その
乗算値を全て（Ｌ個）の到着パスにわたり積算すること
により合成する。この合成された値が、スロットでの干
渉信号電力の推定値となる。The calculation can be performed as follows. Thereby, the estimated values of the L interference signal powers are obtained. Thereafter, the base station estimates the interference signal power of the combined slot by combining the L interference signal powers ′ estimated for each arrival path using a fading envelope (S4). Specifically, the interference signal power 'estimated for each arrival path is multiplied by a fading envelope obtained by interpolation, and the multiplied value is integrated over all (L) arrival paths. Combine. This combined value becomes the estimated value of the interference signal power in the slot.
【００４７】従って、スロットの干渉信号電力の推定値
は、Therefore, the estimated value of the interference signal power of the slot is
【００４８】[0048]
【数１２】 (Equation 12)
【００４９】を計算することにより求めることができ
る。（図４、本発明の実施例参照）。以上、本実施例で
は、図３に示す本発明の干渉信号電力測定方法により、
スロットの干渉信号電力を推定している。このように、
本発明の干渉信号電力測定方法では、従来とは異なり、
フェージング・エンベロープの推定値により重み付けさ
れる前の干渉信号電力の推定値に対して平均化を行うた
め、見通し状態によるフェージング・エンベロープの急
激な変化に影響されることなく、高精度な干渉信号電力
の推定値を得ることができる。Can be obtained by calculating (See FIG. 4, Example of the present invention). As described above, in the present embodiment, the interference signal power measuring method of the present invention shown in FIG.
The interference signal power of the slot is estimated. in this way,
In the interference signal power measurement method of the present invention, unlike the related art,
Averaging is performed on the interference signal power estimation value before weighting with the fading envelope estimation value, so that the interference signal power is not affected by a sudden change in the fading envelope due to the line-of-sight condition, and the interference signal power is highly accurate. Can be obtained.
【００５０】従って、本発明の干渉信号電力測定方法で
得られた干渉信号電力の推定値を用いることにより、移
動通信システムの移動局では、より高精度な受信ＳＩＲ
を計算することができる。尚、本実施例では、特に、本
発明の干渉信号電力測定方法で得られた干渉信号電力の
推定値を、受信ＳＩＲを計算するためのものとして説明
したが、この干渉信号電力の推定値は、必要に応じて他
のパラメータとしても利用することができる。Therefore, by using the estimated value of the interference signal power obtained by the interference signal power measurement method of the present invention, the mobile station of the mobile communication system can obtain a more accurate reception SIR.
Can be calculated. In the present embodiment, the estimated value of the interference signal power obtained by the interference signal power measurement method of the present invention is described as one for calculating the reception SIR, but the estimated value of the interference signal power is , Can be used as other parameters as needed.
【００５１】[0051]
【発明の効果】本発明の干渉信号電力測定方法におい
て、移動通信システムの受信局は、従来とは異なり、各
パイロットシンボル区間における複数の受信データシン
ボルを受信する受信ステップと、各パイロットシンボル
区間における干渉成分を推定する干渉成分推定ステップ
と、干渉信号電力を推定するパス干渉信号電力推定ステ
ップとを、到着する前記各到着パス毎に実行している。According to the interference signal power measuring method of the present invention, the receiving station of the mobile communication system receives a plurality of received data symbols in each pilot symbol section, and a receiving step in each pilot symbol section. The interference component estimating step of estimating the interference component and the path interference signal power estimating step of estimating the interference signal power are executed for each of the arriving paths.
【００５２】その後、合成干渉信号電力推定ステップを
実行し、前記各到着パス毎に推定された干渉信号電力を
合成することにより、スロットでの干渉信号電力を推定
することができる。上記本発明の干渉信号電力測定方法
によれば、測定される干渉信号電力の推定値は、移動局
が見通し状態に移動するとそれに対応して速やかに上が
り、見通し状態が終了するとそれに対応して速やかに下
がることになる。即ち、測定される干渉信号電力の推定
値は、本来の干渉信号電力に追随して速やかに変化する
ことになる。Thereafter, a combined interference signal power estimation step is performed, and the interference signal power estimated for each arrival path is combined to estimate the interference signal power in the slot. According to the interference signal power measurement method of the present invention, the estimated value of the measured interference signal power increases quickly when the mobile station moves to the line-of-sight state, and increases rapidly when the line-of-sight state ends. Will fall. That is, the estimated value of the measured interference signal power quickly changes following the original interference signal power.
【００５３】従って、本発明によれば、移動局が、ビル
影から見通し状態に移動する等の伝送路の利得が急激に
変化する時における、干渉信号電力の測定精度の向上を
実現可能な干渉信号電力測定方法を提供することができ
る。Therefore, according to the present invention, when the gain of the transmission line changes rapidly, for example, when the mobile station moves from the shadow of the building to the line-of-sight state, it is possible to improve the interference signal power measurement accuracy. A method for measuring signal power can be provided.
【図１】パイロット信号を用いた同期検波を行う場合の
信号構成例である。FIG. 1 is an example of a signal configuration when performing synchronous detection using a pilot signal.
【図２】従来の干渉信号電力測定方法である。FIG. 2 shows a conventional interference signal power measuring method.
【図３】本発明の干渉信号電力測定方法である。FIG. 3 shows an interference signal power measuring method according to the present invention.
【図４】本発明及び従来の干渉信号電力測定方法におけ
る実施例の比較である。FIG. 4 is a comparison of embodiments of the present invention and a conventional interference signal power measuring method.
１ 情報シンボル ２ パイロットシンボル ３ａ，３ｂ，３ｃ スロット 1 information symbol 2 pilot symbol 3a, 3b, 3c slot
───────────────────────────────────────────────────── フロントページの続き (72)発明者 安達 文幸 東京都港区虎ノ門二丁目10番１号 エヌ・ ティ・ティ移動通信網株式会社内 Ｆターム(参考） 5K022 EE02 EE13 EE35 EE36 5K042 AA06 BA08 CA02 DA01 EA09 FA11 GA14 GA15 LA12 MA03 5K067 AA03 BB02 BB21 CC10 DD44 DD48 EE02 EE10 GG08 GG11 HH22 LL11 ────────────────────────────────────────────────── ─── Continued on the front page (72) Fumiyuki Adachi Inventor F-term in NTT Mobile Communication Network Co., Ltd. 2-1-1 Toranomon, Minato-ku, Tokyo 5K022 EE02 EE13 EE35 EE36 5K042 AA06 BA08 CA02 DA01 EA09 FA11 GA14 GA15 LA12 MA03 5K067 AA03 BB02 BB21 CC10 DD44 DD48 EE02 EE10 GG08 GG11 HH22 LL11
Claims (4)
情報シンボルに挿入されている複数の到着パスを用い
て、干渉信号電力を測定する移動通信システムの干渉信
号電力測定方法において、 受信局は、到着する前記各到着パス毎に、 各パイロットシンボル区間における複数の受信データシ
ンボルを受信する受信ステップと、 前記複数の受信データシンボルに基づいて、各パイロッ
トシンボル区間における干渉成分を推定する干渉成分推
定ステップと、 前記各パイロットシンボル区間毎に推定された干渉成分
に基づいて、各到着パスにおける干渉信号電力を推定す
るパス干渉信号電力推定ステップとを有し、 その後、前記各到着パス毎に推定された干渉信号電力を
合成することにより、合成されたパイロットシンボル区
間の干渉信号電力を推定する合成干渉信号電力推定ステ
ップを有することを特徴とする干渉信号電力測定方法。1. An interference signal power measurement method for a mobile communication system for measuring interference signal power using a plurality of arrival paths in which a plurality of pilot symbols are inserted into information symbols at predetermined intervals. A receiving step of receiving a plurality of received data symbols in each pilot symbol section, and an interference component estimating step of estimating an interference component in each pilot symbol section based on the plurality of received data symbols. A path interference signal power estimating step of estimating an interference signal power in each arrival path based on the interference component estimated for each pilot symbol section, and thereafter, the interference estimated for each of the arrival paths By combining the signal powers, the interference signal power in the combined pilot symbol section is calculated. Interference signal power measurement method characterized by having a synthetic interference signal power estimating step of constant.
タシンボルの平均値を計算し、 前記複数の受信データシンボルと前記平均値との差分を
計算し、 更に前記差分の２乗の平均値を計算することにより、各
パイロットシンボル区間における干渉成分を推定するこ
とを特徴とする請求項１記載の干渉信号電力測定方法。2. The interference component estimating step includes: calculating an average value of a plurality of received data symbols in each pilot symbol section; calculating a difference between the plurality of received data symbols and the average value; 2. The interference signal power measuring method according to claim 1, wherein an interference component in each pilot symbol section is estimated by calculating an average value of the square of the signal.
る前記差分の２乗の平均値の、各到着パスの複数パイロ
ットシンボル区間にわたる平均値を計算することによ
り、各到着パスにおける干渉信号電力を推定することを
特徴とする請求項２記載の干渉信号電力測定方法。3. The path interference signal power estimating step calculates an average value of an average value of the square of the difference, which is an interference component estimated for each pilot symbol section, over a plurality of pilot symbol sections of each arrival path. The interference signal power measuring method according to claim 2, wherein the interference signal power in each arrival path is estimated by performing the calculation.
平均値に、内挿補間により得られるフェージング・エン
ベロープを乗算し、 前記乗算で得られた乗算値を全ての到着パスにわたり積
算することにより、前記各到着パス毎に推定された干渉
信号電力を合成することを特徴とする請求項３記載の干
渉信号電力測定方法。4. The combined interference signal power estimation step comprises: multiplying an average value over a plurality of pilot symbol sections of each arrival path by a fading envelope obtained by interpolation, and 4. The interference signal power measuring method according to claim 3, wherein the interference signal power estimated for each of the arrival paths is synthesized by integrating over all the arrival paths.
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| US8437251B2 (en) | 2005-12-22 | 2013-05-07 | Qualcomm Incorporated | Methods and apparatus for communicating transmission backlog information |
| US8503938B2 (en) | 2004-10-14 | 2013-08-06 | Qualcomm Incorporated | Methods and apparatus for determining, communicating and using information including loading factors which can be used for interference control purposes |
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