JP2003152630A - Downlink packet scheduling method and radio base station - Google Patents
Downlink packet scheduling method and radio base stationInfo
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- JP2003152630A JP2003152630A JP2001350599A JP2001350599A JP2003152630A JP 2003152630 A JP2003152630 A JP 2003152630A JP 2001350599 A JP2001350599 A JP 2001350599A JP 2001350599 A JP2001350599 A JP 2001350599A JP 2003152630 A JP2003152630 A JP 2003152630A
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- mobile station
- base station
- quality information
- downlink quality
- transmission
- Prior art date
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Abstract
(57)【要約】
【課題】 各移動局の下り品質の変動具合が異なる場合
でも、共有チャネルの時間的な送信割り当てを移動局間
で公平とする。
【解決手段】 自局の無線ゾーンに在圏する複数の移動
局の各々との間で無線通信を行うとともに下り方向のパ
ケット送信の際にスケジューリングを行う無線基地局に
おいて、パケット通信中の各移動局についての瞬時の下
り品質情報と各移動局についての当該瞬時の下り品質情
報の時間的な分布とに基づいて、複数の移動局における
各移動局についてのパケット送信の優先度を表す送信優
先度係数として、各移動局についての瞬時の下り品質の
時間的な分布の累積確率値を算出する優先度係数計算部
１３Ｃと、算出した各移動局についての送信優先度係数
と各移動局に対して送信すべきパケットの有無とに基づ
いて、送信すべきパケットを決定する優先度比較部１３
Ｄとを設けた。
(57) [Summary] [Problem] To make the temporal transmission allocation of a shared channel fair among mobile stations even when the downlink quality of each mobile station varies. SOLUTION: In a wireless base station which performs wireless communication with each of a plurality of mobile stations located in a wireless zone of the own station and performs scheduling at the time of packet transmission in a downlink direction, each mobile station during packet communication performs A transmission priority indicating the priority of packet transmission for each mobile station in a plurality of mobile stations based on the instantaneous downlink quality information for the station and the temporal distribution of the instantaneous downlink quality information for each mobile station As a coefficient, a priority coefficient calculating unit 13C for calculating the cumulative probability value of the temporal distribution of the instantaneous downlink quality for each mobile station, and the calculated transmission priority coefficient for each mobile station and Priority comparison unit 13 that determines a packet to be transmitted based on the presence or absence of a packet to be transmitted
D.
Description
【０００１】[0001]
【発明の属する技術分野】本発明は、下りパケットスケ
ジューリング方法及び無線基地局に係り、より詳しく
は、無線基地局と当該無線基地局により形成される無線
ゾーンに在圏する複数の移動局の各々との間で無線通信
を行う移動通信システムにおける、無線基地局から移動
局への下り方向のパケット送信に関する下りパケットス
ケジューリング方法、及び当該移動通信システムを構成
する無線基地局に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a downlink packet scheduling method and a radio base station, and more particularly to each of a radio base station and a plurality of mobile stations existing in a radio zone formed by the radio base station. TECHNICAL FIELD The present invention relates to a downlink packet scheduling method for downlink packet transmission from a radio base station to a mobile station in a mobile communication system that performs radio communication with the mobile base station and a radio base station that constitutes the mobile communication system.
【０００２】[0002]
【従来の技術】移動通信システムの下りリンクにおい
て、無線基地局が、当該無線基地局の形成する無線ゾー
ンに在圏する複数の移動局との間で、一つの物理チャネ
ルを共有して用いる場合がある。以下、この時に用いら
れる物理チャネルを「下り共有チャネル」と呼ぶ。この
下り共有チャネルにおいては、無線基地局が、通信相手
である複数の移動局に対する送信順序を、各移動局の瞬
時の無線品質に基づいて制御することによって、その基
地局で提供できるスループットを高めることが出来る。
このような無線基地局による送信順序制御は、スケジュ
ーリングと呼ばれる。特に、伝送遅延に対する要求条件
がさほど厳しくないパケットデータ伝送については、ス
ケジューリングを適用することにより、通信容量が増大
し、あるいは、通信品質が向上することが知られている
（例えば、文献：J.M.Holtzman、IEEEVTC2000 sprin
g）。2. Description of the Related Art In a downlink of a mobile communication system, a radio base station shares one physical channel with a plurality of mobile stations existing in a radio zone formed by the radio base station. There is. Hereinafter, the physical channel used at this time is referred to as a "downlink shared channel". In this downlink shared channel, the radio base station controls the transmission order to a plurality of mobile stations with which it communicates, based on the instantaneous radio quality of each mobile station, thereby increasing the throughput that the base station can provide. You can
Such transmission order control by the radio base station is called scheduling. In particular, for packet data transmission with less stringent requirements for transmission delay, it is known that the communication capacity is increased or the communication quality is improved by applying the scheduling (for example, reference: JM Holtzman, IEEEVTC2000 sprin
g).
【０００３】広帯域ＣＤＭＡ無線通信システムの２つの
標準化プロジェクト「３ＧＰＰ」（3rd generation pa
rtnership project）と「３ＧＰＰ２」（3rd generation
partnership project 2）において、下り方向高速パケ
ット伝送方式である「ＨＳＤＰＡ」（文献“3GPP TR2
5.848 v4.0.0”）や「1XEV-Do」(文献“3GPP2 C.S0024R
ev.1.0.0)の標準化が行われている。これらの方式にお
いても、回線の通信速度を適応的に変える方式（適応変
調・符号化方式）と、数ｍｓの周期で動作するスケジュ
ーリングを組み合わせて用いることで、個々のユーザに
対するスループット、およびシステム全体のスループッ
トを向上させることが出来るようになっている。[0003] two of the standardization project "3GPP" wideband CDMA wireless communication system (3 rd generation pa
rtnership project) and "3GPP2" (3 rd generation
In the partnership project 2), the downlink high-speed packet transmission method “HSDPA” (reference “3GPP TR2
5.848 v4.0.0 ”) and“ 1XEV-Do ”(reference“ 3GPP2 C.S0024R
(ev.1.0.0) is being standardized. Even in these methods, by combining the method that adaptively changes the communication speed of the line (adaptive modulation / coding method) and the scheduling that operates at a cycle of several ms, the throughput for individual users and the overall system It is possible to improve the throughput of.
【０００４】パケットスケジューリング方法として、従
来から良く知られるものに、ラウンドロビンスケジュー
ラ、Max C/Iスケジューラ、Proportional fairnessスケ
ジューラと呼ばれるものがある。Conventionally well-known packet scheduling methods are called round robin scheduler, Max C / I scheduler, and Proportional fairness scheduler.
【０００５】このうちラウンドロビンスケジューラは、
無線基地局に属する移動局に順番に下り共有チャネルの
送信割り当てを行うものである。図７に、無線基地局
が、２つの移動局＃１、＃２と通信している場合の、そ
れぞれの移動局における下り品質の時間的変動と、ラウ
ンドロビンスケジューラによる送信割り当てパターンの
一例を示す。ただし、図中の太線で示した部分が、それ
ぞれの移動局に送信割り当てが行われた時間区間を示
す。この図７に示されるように、ラウンドロビンスケジ
ューラは、下り品質にかかわらず、各移動局に順番に
（図７の例では交互に）送信の割り当てが行われるた
め、各移動局に対する送信に割り当てられる時間は公平
となる。しかしながら、各移動局の下り無線品質の良し
悪しに関係なく割り当てが行われるため、以下に説明す
る他の２つのタイプのスケジューラに比較して、一般
に、得られるスループットは低くなる。Of these, the round robin scheduler is
The transmission allocation of the downlink shared channel is sequentially performed to the mobile stations belonging to the radio base station. FIG. 7 shows an example of a temporal change in downlink quality at each mobile station when the radio base station is communicating with two mobile stations # 1 and # 2, and an example of a transmission allocation pattern by the round robin scheduler. . However, the portion shown by the bold line in the figure shows the time period in which the transmission allocation is performed for each mobile station. As shown in FIG. 7, since the round-robin scheduler allocates transmissions to each mobile station in sequence (alternately in the example of FIG. 7) regardless of downlink quality, the round-robin scheduler allocates transmissions to each mobile station. The time spent will be fair. However, since the assignment is performed regardless of whether the downlink radio quality of each mobile station is good or bad, the obtained throughput is generally low as compared with the other two types of schedulers described below.
【０００６】Max C/Iスケジューラは、無線基地局に属
する移動局のうち、スケジューリング周期の開始時に下
り品質が最も高い移動局に対して送信割り当てを行うス
ケジューリング方法である。図８に、無線基地局が、２
つの移動局＃１、＃２と通信している場合の各移動局に
おける下り品質の時間的変動と、Max C/Iスケジューラ
による送信割り当てパターンの一例を示す。通常、伝送
する回線の品質が高くなれば、伝送できる情報速度は高
くなることにより、このようなスケジューリング方法
が、当該無線基地局のスループットを最大にする。しか
しながら、例えば無線基地局から遠くに位置する移動局
などの平均的に下り回線状況が悪い移動局に対してはほ
とんど送信機会が与えられないため、各移動局で得られ
るスループットが極端に異なるおそれがあるという問題
が生じる。すなわち、基地局近傍に位置する移動局は極
端に良いスループットを得ることが出来るものの、それ
以外の移動局は非常に低いスループットとなる状況が生
じうる。The Max C / I scheduler is a scheduling method of performing transmission allocation to a mobile station having the highest downlink quality at the start of a scheduling cycle among mobile stations belonging to a radio base station. In FIG. 8, the wireless base station is
An example of a temporal change of downlink quality in each mobile station when communicating with two mobile stations # 1 and # 2 and a transmission allocation pattern by the Max C / I scheduler is shown. Normally, the higher the quality of the line to be transmitted, the higher the information rate that can be transmitted, and such a scheduling method maximizes the throughput of the radio base station. However, since there is almost no transmission opportunity for a mobile station such as a mobile station located far from the radio base station in which the downlink condition is bad on average, the throughput obtained by each mobile station may be extremely different. There is a problem that there is. That is, although a mobile station located near the base station can obtain extremely good throughput, a situation may occur in which other mobile stations have extremely low throughput.
【０００７】Proportional fairnessスケジューラは、
上記ラウンドロビンスケジューラのように、各移動局へ
の送信に割り当てられる時間は公平にしつつ、個々の移
動局の下り回線状況の瞬時的な変動に応じて送信割り当
てを行うスケジューラである。文献（A.Jalai, IEEE V
TC2000 spring）に、Proportional fairnessスケジュ
ーラの詳細が示されている。具体的には、移動局の瞬時
の下り品質と時間平均した下り品質との比が一番高いも
のに対して送信割り当てを行う。図９に、無線基地局
が、２つの移動局＃１、＃２と通信している場合の、そ
れぞれの移動局における下り品質の時間的変動と、Prop
ortional fairnessスケジューラによる送信割り当てパ
ターンの一例を示す。この図９からわかるように、瞬時
下り品質を、平均下り品質で割った値をスケジューリン
グの基準とすることで、各々の移動局において、下り品
質が比較的良い状況で送信の割り当てが行われるため、
ラウンドロビンスケジューラに比較して、高いスループ
ットを得ることが期待できる。そのうえ、各々の移動局
における下り品質の変動の様子がほぼ等しい状況であれ
ば、時間的に公平な割り当てを実現することが出来る、
という利点がある。このような利点により、従来は、Pr
oportional fairnessスケジューラが用いられていた。The Proportional fairness scheduler is
Like the above-mentioned round robin scheduler, it is a scheduler that fairs the time allocated to transmission to each mobile station and allocates transmission according to the instantaneous fluctuation of the downlink situation of each mobile station. Literature (A. Jalai, IEEE V
TC2000 spring) details the Proportional fairness scheduler. Specifically, transmission allocation is performed to the mobile station having the highest ratio of the instantaneous downlink quality to the time-averaged downlink quality. FIG. 9 shows temporal changes in downlink quality at each mobile station when the radio base station is communicating with two mobile stations # 1 and # 2, and Prop
An example of a transmission allocation pattern by an ortional fairness scheduler is shown. As can be seen from FIG. 9, when the value obtained by dividing the instantaneous downlink quality by the average downlink quality is used as the scheduling reference, each mobile station allocates transmission in a situation in which the downlink quality is relatively good. ,
High throughput can be expected compared to the round robin scheduler. Moreover, if the downlink quality fluctuations in each mobile station are almost equal, time-wise fair allocation can be realized.
There is an advantage. Due to these advantages, conventionally, Pr
The oportional fairness scheduler was used.
【０００８】[0008]
【発明が解決しようとする課題】しかしながら、Propor
tional fairnessスケジューラは、各々の移動局におけ
る下り品質の変動具合が異なる場合には、時間的に公平
なスケジューリングが実現できない、という問題点があ
る。即ち、下り品質の変動は、同じ無線基地局に属する
移動局の中でも、移動局の移動速度や移動局近傍の伝搬
条件などにより、大きく異なることもある。その場合、
変動が大きい移動局においては、その変動のピークに近
い部分で送信割り当てが行われるが、変動がほとんど生
じないような移動局においては、ほとんど送信割り当て
が行われないという問題が生じうる。図１０に、無線基
地局が３つの移動局＃１、＃２、＃３と通信している場
合の、各移動局における下り品質の時間的変動とPropor
tional fairnessスケジューラによる送信割り当てパタ
ーンの一例を示す。図１０において、移動局＃３のよう
な下り品質の変動が小さい移動局に対しては、送信割り
当て時間が極端に短くなり、時間的な公平性を実現でき
ないといった不都合が生じうる。[Problems to be Solved by the Invention] However, Propor
The conventional fairness scheduler has a problem that temporal fair scheduling cannot be realized when the downlink quality variation in each mobile station is different. That is, the variation in downlink quality may vary greatly among mobile stations belonging to the same radio base station depending on the moving speed of the mobile station, the propagation conditions near the mobile station, and the like. In that case,
In a mobile station with a large fluctuation, transmission allocation is performed in a portion close to the peak of the fluctuation, but in a mobile station in which fluctuation hardly occurs, transmission allocation may be rarely performed. In FIG. 10, when the radio base station is communicating with three mobile stations # 1, # 2, and # 3, the temporal variation of downlink quality at each mobile station and the Propor
An example of a transmission allocation pattern by the tional fairness scheduler is shown. In FIG. 10, for a mobile station such as mobile station # 3 in which fluctuations in downlink quality are small, the transmission allocation time becomes extremely short, which may cause inconvenience that fairness in time cannot be realized.
【０００９】本発明は、上記課題を解決するために成さ
れたものであり、各移動局の下り品質の変動具合が異な
る場合においても、各移動局の下り品質が、当該移動局
の平均的な下り品質に比べて良い場合に送信割り当てを
行いつつ、共有チャネルの時間的な送信割り当てを移動
局間で公平とすることができる下りパケットスケジュー
リング方法及び無線基地局を提供することを目的とす
る。The present invention has been made in order to solve the above problems, and even when the downlink quality of each mobile station varies, the downlink quality of each mobile station is the same as that of the mobile station. It is an object of the present invention to provide a downlink packet scheduling method and a radio base station capable of fairing the temporal transmission allocation of a shared channel among mobile stations while performing transmission allocation when it is better than the downlink quality. .
【００１０】[0010]
【課題を解決するための手段】上記目的を達成するため
に、本発明に係る請求項１記載の下りパケットスケジュ
ーリング方法は、無線基地局と当該無線基地局により形
成される無線ゾーンに在圏する複数の移動局の各々との
間で無線通信を行う移動通信システムにおける、前記無
線基地局から前記移動局への下り方向のパケット送信に
関する下りパケットスケジューリング方法であって、前
記無線基地局が、パケット通信中の各移動局についての
瞬時の下り品質情報と各移動局についての当該瞬時の下
り品質情報の時間的な分布とに基づいて、前記複数の移
動局における各移動局についてのパケット送信の優先度
を表す送信優先度係数を算出する優先度係数算出工程
と、前記無線基地局が、各移動局についての送信優先度
係数と各移動局に対して送信すべきパケットの有無とに
基づいて、送信すべきパケットを決定する決定工程と、
を有することを特徴とする。In order to achieve the above object, a downlink packet scheduling method according to a first aspect of the present invention resides in a radio base station and a radio zone formed by the radio base station. In a mobile communication system that performs wireless communication with each of a plurality of mobile stations, a downlink packet scheduling method for downlink packet transmission from the radio base station to the mobile station, wherein the radio base station is a packet Priority is given to packet transmission for each mobile station in the plurality of mobile stations based on the instantaneous downlink quality information for each mobile station in communication and the temporal distribution of the instantaneous downlink quality information for each mobile station. A priority coefficient calculating step of calculating a transmission priority coefficient indicating the degree of transmission, and the radio base station Based on the presence or absence of a packet to be transmitted Te, a determination step of determining a packet to be transmitted,
It is characterized by having.
【００１１】請求項１に記載の構成によれば、無線基地
局は、優先度係数算出工程にて、パケット通信中の各移
動局についての瞬時の下り品質情報と各移動局について
の当該瞬時の下り品質情報の時間的な分布（例えば、当
該分布から得られる瞬時下り品質の平均値に加え、変動
具合を表す値（標準偏差など））とに基づいて、複数の
移動局における各移動局についてのパケット送信の優先
度を表す送信優先度係数を算出し、決定工程にて、各移
動局についての送信優先度係数と各移動局に対して送信
すべきパケットの有無とに基づいて、送信すべきパケッ
トを決定する。例えば、送信すべきパケットが存在する
移動局の中で、算出された送信優先度係数が最も高い移
動局のパケットを、送信すべきパケットとして決定する
ことができる。According to the configuration of claim 1, the radio base station, in the priority coefficient calculation step, instantaneous downlink quality information for each mobile station during packet communication and the instantaneous downlink quality information for each mobile station. For each mobile station in a plurality of mobile stations, based on the temporal distribution of the downlink quality information (for example, the average value of the instantaneous downlink quality obtained from the distribution and a value indicating the degree of fluctuation (standard deviation, etc.)) , A transmission priority coefficient representing the priority of packet transmission is calculated, and in the determining step, transmission is performed based on the transmission priority coefficient for each mobile station and the presence / absence of packets to be transmitted to each mobile station. Determine which packet should be sent. For example, the packet of the mobile station having the highest calculated transmission priority coefficient among the mobile stations having the packet to be transmitted can be determined as the packet to be transmitted.
【００１２】ここで、上記発明の作用を、具体例を挙げ
て説明する。図１（ａ）、（ｂ）は、２つの移動局＃
１、＃２における、下り品質の累積分布の一例を示した
ものである。この例では、２つの移動局の下り品質の分
布が互いに異なる形状となっており、図１（ａ）に示す
移動局＃１の下り品質値は、変動幅が小さく、平均値の
近傍に集中しているのに対し、図１（ｂ）に示す移動局
＃２の下り品質値は、変動幅が大きく、広範囲に分布し
ている。Now, the operation of the above-mentioned invention will be described with reference to specific examples. 1A and 1B show two mobile stations #
3 shows an example of the cumulative distribution of downlink quality in Nos. 1 and # 2. In this example, the downlink quality distributions of the two mobile stations are different from each other, and the downlink quality value of mobile station # 1 shown in FIG. 1A has a small fluctuation range and is concentrated near the average value. On the other hand, the downlink quality values of mobile station # 2 shown in FIG. 1B have a large fluctuation range and are distributed over a wide range.
【００１３】ある時刻ｔ０において、各移動局の下り品
質値が、この図１に示すような時間的分布をとる場合に
は、従来のProportional fairnessスケジューラでは、
（瞬時下り品質／平均下り品質）の値が高い方が選択さ
れるので、この図１の例では、移動局＃２が選択され
る。At a certain time t0, when the downlink quality value of each mobile station has a temporal distribution as shown in FIG. 1, the conventional Proportional fairness scheduler
Since the higher value of (instantaneous downlink quality / average downlink quality) is selected, mobile station # 2 is selected in the example of FIG.
【００１４】一方、この発明では、瞬時下り品質の時間
的な分布も考慮して選択が行われる。例えば、時刻ｔ０
での瞬時値の累積確率は、移動局＃１が「０．９」で、
移動局＃２が「０．７」であるが、この瞬時値の累積確
率が高い方の移動局＃１が、移動局＃２よりも優先され
る。すなわち、上記発明は、各移動局の下り品質の変動
度合いが異なる場合においても、時間的に公平な送信割
り当てを行うように作用する。On the other hand, in the present invention, the selection is made in consideration of the temporal distribution of the instantaneous downlink quality. For example, time t0
The cumulative probability of the instantaneous value at is 0.9 for mobile station # 1,
Although the mobile station # 2 is "0.7", the mobile station # 1 having the higher cumulative probability of this instantaneous value is prioritized over the mobile station # 2. That is, the above-described invention operates so as to perform time-wise fair transmission allocation even when the degree of variation in downlink quality of each mobile station is different.
【００１５】このように、共有チャネルの送信割り当て
において、従来のように各移動局についての瞬時の下り
品質と平均下り品質のみでなく、当該瞬時の下り品質情
報の時間的な分布も判断要素に加えて、共有チャネルの
送信割り当てが行われるので、各移動局における下り品
質の変動の具合（即ち、時間的な分布の形状）が異なる
場合においても、時間的に公平な送信割り当てを行うこ
とが出来る。As described above, in the shared channel transmission allocation, not only the instantaneous downlink quality and the average downlink quality of each mobile station as in the conventional case but also the temporal distribution of the instantaneous downlink quality information are used as the judgment factors. In addition, since transmission allocation of the shared channel is performed, even when the degree of variation in downlink quality at each mobile station (that is, the shape of temporal distribution) is different, time-wise fair transmission allocation can be performed. I can.
【００１６】ところで、優先度係数算出工程では、請求
項２に記載したように、無線基地局は、送信優先度係数
として、各移動局についての瞬時の下り品質情報の時間
的な分布の累積確率値を算出することが好ましい。これ
により、各移動局の下り品質が良い状況で送信割り当て
が行われる上に、送信割り当ての公平化をより精度良く
行うことができる。By the way, in the priority coefficient calculation step, as described in claim 2, the radio base station uses the cumulative probability of the temporal distribution of the instantaneous downlink quality information for each mobile station as the transmission priority coefficient. It is preferable to calculate the value. By this means, transmission allocation can be performed in a situation where the downlink quality of each mobile station is good, and moreover, transmission allocation can be faired more accurately.
【００１７】また、優先度係数算出工程では、請求項３
に記載したように、無線基地局は、各移動局についての
瞬時の下り品質情報、各移動局についての瞬時の下り品
質情報の時間的な分布から得られる当該瞬時の下り品質
情報の平均値及び当該瞬時の下り品質情報の標準偏差に
基づいて、各移動局についての送信優先度係数を算出す
ることが好ましい。このように送信優先度係数の算出に
おいて、瞬時の下り品質情報の標準偏差を用いること
で、各移動局の下り品質が良い状況で送信割り当てが行
われる上に、比較的簡易に、時間的に公平なスケジュー
リングを実現することが出来る。Further, in the priority coefficient calculation step, the third aspect
As described in, the radio base station, the instantaneous downlink quality information about each mobile station, the average value of the instantaneous downlink quality information obtained from the temporal distribution of the instantaneous downlink quality information about each mobile station, and It is preferable to calculate the transmission priority coefficient for each mobile station based on the standard deviation of the instantaneous downlink quality information. Thus, in the calculation of the transmission priority coefficient, by using the standard deviation of the instantaneous downlink quality information, transmission allocation is performed in a situation where the downlink quality of each mobile station is good, and it is relatively simple and time-based. Fair scheduling can be realized.
【００１８】より具体的には、請求項４に記載したよう
に、優先度係数算出工程では、無線基地局は、送信優先
度係数として、瞬時の下り品質情報と、当該瞬時の下り
品質情報の平均値及び当該下り品質情報の標準偏差の積
との比を算出することが好ましい。上記の比は、例え
ば、（瞬時の下り品質情報／（瞬時の下り品質情報の平
均値×当該下り品質情報の標準偏差））で表される。More specifically, as described in claim 4, in the priority coefficient calculating step, the radio base station uses the instantaneous downlink quality information and the instantaneous downlink quality information as the transmission priority coefficient. It is preferable to calculate the ratio of the average value and the product of the standard deviations of the downlink quality information. The above ratio is represented by, for example, (instantaneous downlink quality information / (average value of instantaneous downlink quality information × standard deviation of the downlink quality information)).
【００１９】また、瞬時の下り品質情報としては、請求
項５に記載したように、無線基地局から送信するリフ
ァレンスチャネルの信号電力対干渉電力比（ＳＩＲ）、
移動局から無線基地局に送信される推奨の変調・符号
化レベル（推奨ＭＣＳレベル）、下り回線で各移動局
との間に設定される付随個別チャネルの送信電力レベ
ル、無線基地局から送信するリファレンスチャネルの
受信信号電力レベル、又は無線基地局から送信するリ
ファレンスチャネルの受信信号電力対帯域内信号電力
比、の何れかを採用することができる。As the instantaneous downlink quality information, as described in claim 5, the signal power to interference power ratio (SIR) of the reference channel transmitted from the radio base station,
Recommended modulation / coding level (recommended MCS level) transmitted from mobile station to radio base station, transmission power level of associated dedicated channel set between each mobile station in downlink, transmission from radio base station Either the received signal power level of the reference channel or the received signal power of the reference channel transmitted from the radio base station to the in-band signal power ratio can be adopted.
【００２０】リファレンスチャネルのＳＩＲを採用す
れば、精度よく品質の差別化を計ることが可能となり、
推奨ＭＣＳレベルを採用すれば、直接的に各移動局に
ついてのスループットを高めるスケジューリングが可能
となる。また、付随個別チャネルの送信電力レベルを
採用すれば、移動局からの下り品質報告を受けることな
くスケジューリングを行うことが可能となり、リファ
レンスチャネルの受信信号電力レベル又はリファレン
スチャネルの受信信号電力対帯域内信号電力比を採用す
れば、移動局は簡易的に下り品質を測定することが可能
となる。If the SIR of the reference channel is adopted, it becomes possible to accurately differentiate the quality,
If the recommended MCS level is adopted, it is possible to directly perform scheduling for increasing the throughput for each mobile station. In addition, if the transmission power level of the associated dedicated channel is adopted, it becomes possible to perform scheduling without receiving the downlink quality report from the mobile station, and the reception signal power level of the reference channel or the reception signal power of the reference channel vs. in-band. If the signal power ratio is adopted, the mobile station can easily measure the downlink quality.
【００２１】上述した下りパケットスケジューリング方
法に係る発明は、以下のように無線基地局に係る発明と
して記述することもできる。これらは実質的に同一の技
術的思想に基づくものであり、同様の作用・効果を奏す
る。The invention relating to the downlink packet scheduling method described above can be described as an invention relating to a radio base station as follows. These are based on substantially the same technical idea, and have the same action and effect.
【００２２】即ち、本発明に係る無線基地局は、請求項
６に記載したように、自局により形成される無線ゾーン
に在圏する複数の移動局の各々との間で無線通信を行う
とともに、当該無線通信における前記移動局への下り方
向のパケット送信の際に下りパケットスケジューリング
を行う無線基地局であって、パケット通信中の各移動局
についての瞬時の下り品質情報と各移動局についての当
該瞬時の下り品質情報の時間的な分布とに基づいて、前
記複数の移動局における各移動局についてのパケット送
信の優先度を表す送信優先度係数を算出する優先度係数
算出手段と、各移動局についての送信優先度係数と各移
動局に対して送信すべきパケットの有無とに基づいて、
送信すべきパケットを決定する決定手段と、を備えたこ
とを特徴とする。That is, the radio base station according to the present invention, as described in claim 6, performs radio communication with each of a plurality of mobile stations existing in a radio zone formed by itself. A wireless base station that performs downlink packet scheduling at the time of downlink packet transmission to the mobile station in the radio communication, wherein instantaneous downlink quality information about each mobile station during packet communication and about each mobile station Based on the instantaneous temporal distribution of downlink quality information, priority coefficient calculation means for calculating a transmission priority coefficient indicating the priority of packet transmission for each mobile station among the plurality of mobile stations, and each mobile station. Based on the transmission priority coefficient for the station and the presence or absence of packets to be transmitted to each mobile station,
And a determining means for determining a packet to be transmitted.
【００２３】ここで、優先度係数算出手段は、請求項７
に記載したように、前記送信優先度係数として、各移動
局についての瞬時の下り品質情報の時間的な分布の累積
確率値を算出するよう構成することが好ましい。Here, the priority coefficient calculating means is the same as in claim 7.
As described above, it is preferable to calculate the cumulative probability value of the temporal distribution of the instantaneous downlink quality information for each mobile station as the transmission priority coefficient.
【００２４】また、優先度係数算出手段は、請求項８に
記載したように、前記各移動局についての瞬時の下り品
質情報、前記各移動局についての瞬時の下り品質情報の
時間的な分布から得られる当該瞬時の下り品質情報の平
均値及び当該瞬時の下り品質情報の標準偏差に基づい
て、前記各移動局についての送信優先度係数を算出する
よう構成することが好ましい。Further, the priority coefficient calculating means, as described in claim 8, uses the instantaneous downlink quality information for each mobile station and the temporal distribution of the instantaneous downlink quality information for each mobile station. Preferably, the transmission priority coefficient for each mobile station is calculated based on the obtained average value of the instantaneous downlink quality information and the standard deviation of the instantaneous downlink quality information.
【００２５】また、優先度係数算出手段は、請求項９に
記載したように、前記送信優先度係数として、前記瞬時
の下り品質情報と、当該瞬時の下り品質情報の平均値及
び当該下り品質情報の標準偏差の積との比を算出するよ
う構成することが好ましい。Further, as described in claim 9, the priority coefficient calculating means, as the transmission priority coefficient, the instantaneous downlink quality information, an average value of the instantaneous downlink quality information, and the downlink quality information. Preferably, it is configured to calculate the ratio with the product of the standard deviations of.
【００２６】更に、瞬時の下り品質情報は、請求項１０
に記載したように、無線基地局から送信するリファレ
ンスチャネルの信号電力対干渉電力比、移動局から前
記無線基地局に送信される推奨の変調・符号化レベル、
下り回線で各移動局との間に設定される付随個別チャ
ネルの送信電力レベル、無線基地局から送信するリフ
ァレンスチャネルの受信信号電力レベル、又は無線基
地局から送信するリファレンスチャネルの受信信号電力
対帯域内信号電力比、の何れかであることが好ましい。Furthermore, the instantaneous downlink quality information is defined in claim 10.
As described in, the signal power to interference power ratio of the reference channel transmitted from the radio base station, the recommended modulation and coding level transmitted from the mobile station to the radio base station,
The transmission power level of the associated dedicated channel set with each mobile station on the downlink, the reception signal power level of the reference channel transmitted from the radio base station, or the reception signal power vs. band of the reference channel transmitted from the radio base station It is preferable that either of the internal signal power ratios.
【００２７】[0027]
【発明の実施の形態】［第１実施形態］以下、図面を用
いて本発明の第１実施形態について説明する。図２に
は、本発明が適用された移動通信システム１のシステム
構成例を示す。同図に示すように、本発明は、無線基地
局１０と複数の移動局２０Ａ、２０Ｂ、２０Ｃ（以下、
移動局２０と総称する。）から構成される移動通信シス
テム１を想定している。下り共有チャネル３０は、全て
の移動局２０に対して共有して用いられる下り方向のみ
のチャネルであり、各移動局２０に対するパケットデー
タを伝送するのに用いられる。一方、付随個別チャネル
４０Ａ、４０Ｂ、４０Ｃ（以下、付随個別チャネル４０
と総称する。）は、下り共有チャネル３０を用いて通信
を行う各々の移動局２０に個別に割り当てられる双方向
のチャネルであり、上りでは、ユーザデータ以外に、パ
イロットシンボル、下り付随個別チャネルのための送信
電力制御コマンド、共有チャネルのスケジューリング
や、適用変調・符号化に用いるための下り品質情報等が
伝送される。下りでは、上り付随個別チャネルのための
送信電力制御コマンド等が伝送される。BEST MODE FOR CARRYING OUT THE INVENTION [First Embodiment] A first embodiment of the present invention will be described below with reference to the drawings. FIG. 2 shows a system configuration example of the mobile communication system 1 to which the present invention is applied. As shown in the figure, the present invention is directed to a radio base station 10 and a plurality of mobile stations 20A, 20B, 20C (hereinafter,
Collectively referred to as mobile station 20. ) Is assumed. The downlink shared channel 30 is a channel only in the downlink direction that is shared and used by all mobile stations 20, and is used to transmit packet data for each mobile station 20. On the other hand, the associated individual channels 40A, 40B, 40C (hereinafter, associated individual channels 40
Collectively. ) Is a bidirectional channel that is individually assigned to each mobile station 20 that communicates using the downlink shared channel 30, and in the uplink, in addition to user data, transmission power for pilot symbols and downlink associated dedicated channels. Control commands, scheduling of shared channels, downlink quality information used for applied modulation / coding, and the like are transmitted. On the downlink, a transmission power control command for the uplink associated dedicated channel and the like are transmitted.
【００２８】図３には、本発明が適用される移動通信シ
ステムの無線基地局１０の概要構成例を示す。同図に示
すように、無線基地局１０は、アンテナ１１を備えた送
受信無線部１７と、上位ノードインターフェース部１２
と、下り共有チャネル送信信号処理部１３と、付随個別
チャネル送受信信号処理部１４と、共通パイロットチャ
ネル送信信号処理部１５と、各チャネルの送受信信号処
理部１６とを含んで構成されている。FIG. 3 shows a schematic configuration example of the radio base station 10 of the mobile communication system to which the present invention is applied. As shown in the figure, the radio base station 10 includes a transmission / reception radio unit 17 having an antenna 11 and an upper node interface unit 12.
A downlink shared channel transmission signal processing section 13, an associated dedicated channel transmission / reception signal processing section 14, a common pilot channel transmission signal processing section 15, and a transmission / reception signal processing section 16 for each channel.
【００２９】無線基地局１０では、上位ノードより上位
ノードインターフェース部１２を介して入力された各チ
ャネルの送受信データは、各チャネルの送受信信号処理
部１６に入力される。各チャネルの送受信信号処理部１
６において、上り方向のチャネルでは、逆拡散、Ｒａｋ
ｅ受信、誤り訂正復号やＴＰＣコマンドの復号等の受信
信号処理が行われる。また、下り方向のチャネルでは、
誤り訂正符号化、下り高速送信電力制御のための送信電
力調整、チャネライゼーションコード拡散処理等が行わ
れる。In the radio base station 10, the transmission / reception data of each channel input from the upper node via the upper node interface unit 12 is input to the transmission / reception signal processing unit 16 of each channel. Transmit / receive signal processing unit 1 for each channel
6, in the uplink channel, despreading, Rak
Received signal processing such as e reception, error correction decoding, and TPC command decoding is performed. In the downlink channel,
Error correction coding, transmission power adjustment for downlink high-speed transmission power control, channelization code spreading processing, etc. are performed.
【００３０】また、本発明が適用される対象の物理チャ
ネルである下り共有チャネル３０（図２）の送信信号処
理部１３には、各ユーザの付随個別チャネル送受信信号
処理部１４より、上り付随チャネルを用いて各移動局２
０から報告された下り品質情報が入力される。Further, the transmission signal processing unit 13 of the downlink shared channel 30 (FIG. 2), which is the physical channel to which the present invention is applied, has the uplink dedicated channel transmitted from the transmission / reception signal processing unit 14 of the associated dedicated channel of each user. Using each mobile station 2
The downlink quality information reported from 0 is input.
【００３１】なお、下り共有チャネル３０（図２）につ
いては、下り共有チャネル送信信号処理部１３により、
後述するスケジューリング等も行われる。送受信無線部
１７においては、下り共有チャネル３０に関する送信デ
ータを下り共有チャネル送信信号処理部１３から受け取
り、それらに対し、合成、スクランブルコード拡散を行
った後に、ナイキストフィルタリングや周波数変換が行
われ、アンテナ１１より送信される。一方、アンテナ１
１から受信された信号は、送受信無線部１７において、
周波数変換、フィルタリング、標本化、量子化が施され
た上で、付随個別チャネル送受信信号処理部１４および
その他のチャネルの送受信信号処理部１６に入力され
る。Regarding the downlink shared channel 30 (FIG. 2), the downlink shared channel transmission signal processing unit 13
Scheduling described later is also performed. The transmission / reception radio unit 17 receives the transmission data regarding the downlink shared channel 30 from the downlink shared channel transmission signal processing unit 13, performs synthesis and scramble code spreading on them, then performs Nyquist filtering and frequency conversion, and the antenna 11 is transmitted. On the other hand, antenna 1
In the transmission / reception wireless unit 17, the signal received from
After being subjected to frequency conversion, filtering, sampling, and quantization, they are input to the associated dedicated channel transmission / reception signal processing unit 14 and transmission / reception signal processing unit 16 of other channels.
【００３２】次に、図４を用いて、下り共有チャネル送
信信号処理部１３の構成と動作を説明する。同図に示す
ように、下り共有チャネル送信信号処理部１３は、ユー
ザデータ蓄積部１３Ａと、変調・符号化レベル選択部１
３Ｂと、優先度係数計算部１３Ｃと、優先度比較部１３
Ｄと、変調符号化部１３Ｅとを含んで構成されており、
このうちユーザデータ蓄積部１３Ａ、変調・符号化レベ
ル選択部１３Ｂ及び優先度係数計算部１３Ｃは、ユーザ
毎に設けられている。Next, the configuration and operation of the downlink shared channel transmission signal processing section 13 will be described with reference to FIG. As shown in the figure, the downlink shared channel transmission signal processing unit 13 includes a user data storage unit 13A and a modulation / coding level selection unit 1
3B, a priority coefficient calculation unit 13C, and a priority comparison unit 13
D and a modulation and coding unit 13E,
Of these, the user data storage unit 13A, the modulation / coding level selection unit 13B, and the priority coefficient calculation unit 13C are provided for each user.
【００３３】下り共有チャネル送信信号処理部１３で
は、上位ノードから上位ノードインターフェース部１２
を介して受信されたユーザデータは、ユーザデータ蓄積
部１３Ａに蓄積される。また、付随個別チャネル送受信
信号処理部１４からは、各移動局２０から付随個別チャ
ネル４０を用いて伝送された下り共通パイロットチャネ
ルの受信ＳＩＲ（受信に係る信号電力対干渉電力比）の
報告値が、変調・符号化レベル選択部１３Ｂ及び優先度
係数計算部１３Ｃに入力される。In the downlink shared channel transmission signal processing unit 13, from the upper node to the upper node interface unit 12
The user data received via is stored in the user data storage unit 13A. In addition, the report value of the reception SIR (signal power to interference power ratio related to reception) of the downlink common pilot channel transmitted from each mobile station 20 using the associated dedicated channel 40 is output from the associated dedicated channel transmission / reception signal processing unit 14. , And is input to the modulation / coding level selection unit 13B and the priority coefficient calculation unit 13C.
【００３４】優先度係数計算部１３Ｃでは、入力された
下り共通パイロットチャネルの受信ＳＩＲ報告値に基づ
いて優先度が計算され、優先度比較部１３Ｄに入力され
る。一方、変調・符号化レベル選択部１３Ｂでは、入力
された下り共通パイロットチャネル受信ＳＩＲ報告値に
基づいて、変調・符号化レベルの選択が行われる。In the priority coefficient calculation unit 13C, the priority is calculated based on the received reception SIR report value of the downlink common pilot channel and is input to the priority comparison unit 13D. On the other hand, the modulation / coding level selection unit 13B selects the modulation / coding level based on the input downlink common pilot channel reception SIR report value.
【００３５】優先度比較部１３Ｄでは、各ユーザの優先
度の比較が行われ、ユーザデータ蓄積部１３Ａにデータ
が蓄積されたユーザのうち送信優先度係数がもっとも高
いユーザ向けのユーザデータをユーザデータ蓄積部１３
Ａから変調符号化部１３Ｅに入力するとともに、変調・
符号化レベル選択部１３Ｂから変調符号化レベルを変調
符号化部１３Ｅに入力する。変調符号化部１３Ｅでは、
入力されたユーザデータに対して、入力された符号化レ
ベルに基づいて、変調処理及び符号化処理を施し、これ
ら処理後のユーザデータを送受信無線部１７へ出力す
る。The priority comparison unit 13D compares the priorities of the respective users, and the user data for the user having the highest transmission priority coefficient among the users whose data is stored in the user data storage unit 13A is set as the user data. Accumulator 13
Input from A to the modulation / coding unit 13E,
The modulation coding level is input from the coding level selection unit 13B to the modulation coding unit 13E. In the modulation / coding unit 13E,
Modulation processing and coding processing are performed on the input user data based on the input coding level, and the user data after these processing is output to the transmission / reception wireless unit 17.
【００３６】ここで、図５を用いて、本実施形態にて特
徴的な優先度係数計算部１３Ｃの構成と動作を説明す
る。同図に示すように、優先度係数計算部１３Ｃは、下
り品質値累積確率分布作成部Ｃ１と累積確率計算部Ｃ２
とを含んで構成されている。Here, the configuration and operation of the priority coefficient calculator 13C, which is characteristic of this embodiment, will be described with reference to FIG. As shown in the figure, the priority coefficient calculating unit 13C includes a downlink quality value cumulative probability distribution creating unit C1 and a cumulative probability calculating unit C2.
It is configured to include and.
【００３７】優先度係数計算部１３Ｃでは、下り共通パ
イロットチャネル受信ＳＩＲ報告値が下り品質値累積確
率分布作成部Ｃ１に入力され、下り品質値累積確率分布
作成部Ｃ１において下り共通パイロット受信ＳＩＲ報告
値の累積確率分布が作成又は更新される。In the priority coefficient calculating unit 13C, the downlink common pilot channel reception SIR report value is input to the downlink quality value cumulative probability distribution creating unit C1, and the downlink quality value cumulative probability distribution creating unit C1 receives the downlink common pilot reception SIR report value. The cumulative probability distribution of is created or updated.
【００３８】また、累積確率計算部Ｃ２には、下り共通
パイロットチャネル受信ＳＩＲ報告値と当該報告値の累
積確率分布とが入力され、累積確率計算部Ｃ２はこれら
累積確率分布および下り共通パイロット受信ＳＩＲ報告
値を用いて、当該下り共通パイロット受信ＳＩＲ報告値
の累積確率値を求め、得られた累積確率値を優先度比較
部１３Ｄに出力する。この出力された累積確率値は、前
述したように、優先度比較部１３Ｄにおいて送信優先度
係数として扱われ、送信優先度係数がもっとも高いユー
ザ向けのユーザデータに対しスケジューリングされるこ
ととなる。Further, the downlink common pilot channel reception SIR report value and the cumulative probability distribution of the report value are input to the cumulative probability calculation section C2, and the cumulative probability calculation section C2 receives these cumulative probability distribution and downlink common pilot reception SIR. Using the report value, the cumulative probability value of the downlink common pilot reception SIR report value is obtained, and the obtained cumulative probability value is output to the priority comparison unit 13D. As described above, the output cumulative probability value is treated as the transmission priority coefficient in the priority comparison unit 13D, and the user data for the user having the highest transmission priority coefficient is scheduled.
【００３９】以上、説明したように、本実施形態におい
ては、下り品質の累積確率値をスケジューリングの優先
度として用いるため、個々の移動局２０について考えた
場合には、下り品質状況の良い時に送信割り当てが行わ
れることとなり、各々の移動局２０に割り当てられる時
間を公平とすることができる。また、下り共通パイロッ
ト受信ＳＩＲ報告値を、スケジューリングの基準値とし
て用いることにより、よりきめの細かい優先度判定が可
能となる。As described above, in the present embodiment, since the cumulative probability value of downlink quality is used as the scheduling priority, when considering each mobile station 20, transmission is performed when the downlink quality situation is good. Since the allocation is performed, the time allocated to each mobile station 20 can be made fair. Further, by using the downlink common pilot reception SIR report value as a reference value for scheduling, it becomes possible to make a more detailed priority determination.
【００４０】［第２実施形態］次に、図面を用いて本発
明の第２実施形態について説明する。本実施形態では、
優先度係数計算部１３Ｃの構成のみが第１実施形態と異
なる。即ち、無線基地局１０の概要構成は第１実施形態
と同様、図３のとおりとする。そこで、図６を用いて本
実施形態の優先度係数計算部１３Ｃの構成と動作を説明
する。[Second Embodiment] Next, a second embodiment of the present invention will be described with reference to the drawings. In this embodiment,
Only the configuration of the priority coefficient calculation unit 13C is different from that of the first embodiment. That is, the schematic configuration of the wireless base station 10 is as shown in FIG. 3, as in the first embodiment. Therefore, the configuration and operation of the priority coefficient calculation unit 13C of this embodiment will be described with reference to FIG.
【００４１】図６に示すように、優先度係数計算部１３
Ｃは、下り共通パイロットチャネルの受信ＳＩＲ報告値
の平均値を計算する平均値計算部Ｃ３と、下り共通パイ
ロットチャネルの受信ＳＩＲ報告値の標準偏差を計算す
る標準偏差計算部Ｃ４と、除算機能を持つ除算部Ｃ５、
Ｃ６とを含んで構成される。As shown in FIG. 6, the priority coefficient calculator 13
C has an average value calculation unit C3 that calculates the average value of the received SIR report values of the downlink common pilot channel, a standard deviation calculation unit C4 that calculates the standard deviation of the received SIR report values of the downlink common pilot channel, and a division function. Division unit C5,
And C6.
【００４２】このような優先度係数計算部１３Ｃには、
付随個別チャネル送受信信号処理部１４（図３）より下
り共通パイロットチャネルの受信ＳＩＲ報告値が入力さ
れ、当該報告値は除算部Ｃ５、平均値計算部Ｃ３、標準
偏差計算部Ｃ４の各々に入力される。そして、平均値計
算部Ｃ３において平均値が計算されるとともに、標準偏
差計算部Ｃ４において標準偏差が計算される。さらに、
除算部Ｃ５では、入力Ａとしての下り共通パイロットチ
ャネルの受信ＳＩＲ報告値を、入力Ｂとしての平均値で
割る除算が行われ、その除算結果が除算部Ｃ６に出力さ
れる。さらに、除算部Ｃ６では、入力Ａとしての上記除
算結果（報告値／平均値）を、入力Ｂとしての標準偏差
で割る除算が行われ、その除算結果、即ち、（報告値／
（平均値×標準偏差））で表される比の値が送信優先度
係数として出力される。The priority coefficient calculating section 13C as described above has
The reception SIR report value of the downlink common pilot channel is input from the associated dedicated channel transmission / reception signal processing unit 14 (FIG. 3), and the report value is input to each of the division unit C5, the average value calculation unit C3, and the standard deviation calculation unit C4. It Then, the average value calculation unit C3 calculates the average value, and the standard deviation calculation unit C4 calculates the standard deviation. further,
The division unit C5 divides the received SIR report value of the downlink common pilot channel as the input A by the average value as the input B, and the division result is output to the division unit C6. Further, in the division unit C6, the division result (report value / average value) as the input A is divided by the standard deviation as the input B, and the division result, that is, (report value /
The value of the ratio represented by (average value × standard deviation) is output as the transmission priority coefficient.
【００４３】この出力された比の値は、第１実施形態で
述べたように、優先度比較部１３Ｄ（図４）において送
信優先度係数として扱われ、送信優先度係数がもっとも
高いユーザ向けのユーザデータに対しスケジューリング
されることとなる。As described in the first embodiment, the output value of the ratio is treated as a transmission priority coefficient by the priority comparison unit 13D (FIG. 4), and is for a user having the highest transmission priority coefficient. It will be scheduled for user data.
【００４４】以上、説明したように、本実施形態におい
ては、スケジューリングの送信優先度係数として、瞬時
の下り品質、およびその平均値だけでなく標準偏差も用
いて得た値、即ち、（報告値／（平均値×標準偏差））
で表される比の値を用いるため、個々の移動局２０にお
ける下り品質の変動具合が異なる場合においても、個々
の移動局２０について考えた場合には、下り品質状況の
良い時に送信割り当てが行われることとなり、各々の移
動局２０に割り当てられる時間を公平とすることができ
る。また、このような時間的に公平なスケジューリング
を行うための構成として、標準偏差を計算し除算するだ
けという簡易な構成で実現することができる。また、下
り共通パイロットの受信ＳＩＲを、スケジューリングの
基準値として用いることにより、よりきめの細かい優先
度判定が可能となる。As described above, in the present embodiment, the value obtained by using not only the instantaneous downlink quality and its average value but also the standard deviation as the transmission priority coefficient for scheduling, that is, (reported value) / (Average value x standard deviation))
Since the ratio value represented by is used, even if the downlink quality variation in each mobile station 20 is different, when considering each mobile station 20, the transmission allocation is performed when the downlink quality situation is good. Therefore, the time allotted to each mobile station 20 can be made fair. Further, as a configuration for performing such fair scheduling in time, it is possible to realize with a simple configuration in which the standard deviation is simply calculated and divided. Further, by using the reception SIR of the downlink common pilot as a reference value for scheduling, it becomes possible to perform finer priority determination.
【００４５】なお、上記第１、第２実施形態では、下り
品質報告を、下り共通パイロットチャネルの受信ＳＩＲ
としているが、これを、移動局２０による推奨ＭＣＳレ
ベル、付随個別チャネルの送信電力、下り共通パイロッ
トの受信電力、或いは下り共通パイロットのＥc/Ｎo
（受信信号電力対帯域内信号電力比）等とすることもで
きる。もちろん、下り品質の内容はこの発明を限定する
ものではない。In the first and second embodiments, the downlink quality report is transmitted as the reception SIR of the downlink common pilot channel.
However, this is the recommended MCS level by the mobile station 20, the transmission power of the associated dedicated channel, the reception power of the downlink common pilot, or the Ec / No of the downlink common pilot.
(Received signal power to in-band signal power ratio) or the like. Of course, the content of the downlink quality does not limit the present invention.
【００４６】[0046]
【発明の効果】以上説明したように、本発明によれば、
共有チャネルの送信割り当てにおいて、従来のように各
移動局についての瞬時の下り品質と平均下り品質のみで
なく、当該瞬時の下り品質情報の時間的な分布も判断要
素に加えて、共有チャネルの送信割り当てが行われるの
で、各移動局における下り品質の変動の具合（即ち、時
間的な分布の形状）が異なる場合においても、時間的に
公平な送信割り当てを行うことが出来る。As described above, according to the present invention,
In the shared channel transmission allocation, not only the instantaneous downlink quality and average downlink quality for each mobile station as in the past, but also the temporal distribution of the instantaneous downlink quality information is added to the decision factor, and the transmission of the shared channel is performed. Since the allocation is performed, even when the degree of variation in downlink quality (that is, the shape of temporal distribution) in each mobile station is different, time-wise fair transmission allocation can be performed.
【図１】移動局における下り品質の累積分布の一例を示
したグラフであり、（ａ）は下り品質値の変動幅が小さ
く平均値の近傍に集中している例を、（ｂ）は下り品質
値の変動幅が大きく広範囲に分布している例を、それぞ
れ示す。FIG. 1 is a graph showing an example of a cumulative distribution of downlink quality in a mobile station, where (a) is an example in which the fluctuation range of downlink quality values is small and concentrated near the average value, and (b) is downlink. An example is shown in which the fluctuation range of the quality value is large and distributed over a wide range.
【図２】移動通信システムのシステム構成図である。FIG. 2 is a system configuration diagram of a mobile communication system.
【図３】無線基地局の構成図である。FIG. 3 is a configuration diagram of a radio base station.
【図４】下り共有チャネル送信信号処理部の構成図であ
る。FIG. 4 is a configuration diagram of a downlink shared channel transmission signal processing unit.
【図５】第１実施形態における優先度係数計算部の構成
図である。FIG. 5 is a configuration diagram of a priority coefficient calculation unit in the first embodiment.
【図６】第２実施形態における優先度係数計算部の構成
図である。FIG. 6 is a configuration diagram of a priority coefficient calculation unit in the second embodiment.
【図７】２つの移動局における下り品質の時間的変動と
ラウンドロビンスケジューラによる送信割り当てパター
ンの一例を示す図である。FIG. 7 is a diagram showing an example of a temporal change in downlink quality in two mobile stations and a transmission allocation pattern by a round robin scheduler.
【図８】２つの移動局における下り品質の時間的変動と
Max C/Iスケジューラによる送信割り当てパターンの一
例を示す図である。[Fig. 8] Fig. 8 is a graph showing temporal changes in downlink quality at two mobile stations.
It is a figure which shows an example of the transmission allocation pattern by the Max C / I scheduler.
【図９】２つの移動局における下り品質の時間的変動と
Proportional fairnessスケジューラによる送信割り当
てパターンの一例を示す図である。[Fig. 9] Fig. 9 is a graph showing temporal changes in downlink quality at two mobile stations.
It is a figure which shows an example of the transmission allocation pattern by a Proportional fairness scheduler.
【図１０】３つの移動局における下り品質の時間的変動
とProportional fairnessスケジューラによる送信割り
当てパターンの一例を示す図である。FIG. 10 is a diagram showing an example of a temporal change in downlink quality in three mobile stations and a transmission allocation pattern by a Proportional fairness scheduler.
１…移動通信システム、１０…無線基地局、１１…アン
テナ、１２…上位ノードインターフェース部、１３…下
り共有チャネル送信信号処理部、１３Ａ…ユーザデータ
蓄積部、１３Ｂ…変調・符号化レベル選択部、１３Ｃ…
優先度係数計算部、１３Ｄ…優先度比較部、１３Ｅ…変
調符号化部、１４…付随個別チャネル送受信信号処理
部、１５…共通パイロットチャネル送信信号処理部、１
６…送受信信号処理部、１７…送受信無線部、２０…移
動局、３０…共有チャネル、４０…付随個別チャネル、
Ｃ１…品質値累積確率分布作成部、Ｃ２…累積確率計算
部、Ｃ３…平均値計算部、Ｃ４…標準偏差計算部、Ｃ
５、Ｃ６…除算部。DESCRIPTION OF SYMBOLS 1 ... Mobile communication system, 10 ... Radio base station, 11 ... Antenna, 12 ... Upper node interface part, 13 ... Downlink shared channel transmission signal processing part, 13A ... User data storage part, 13B ... Modulation / coding level selection part, 13C ...
Priority coefficient calculation unit, 13D ... Priority comparison unit, 13E ... Modulation coding unit, 14 ... Associated dedicated channel transmission / reception signal processing unit, 15 ... Common pilot channel transmission signal processing unit, 1
6 ... Transmission / reception signal processing unit, 17 ... Transmission / reception radio unit, 20 ... Mobile station, 30 ... Shared channel, 40 ... Associated individual channel,
C1 ... Quality value cumulative probability distribution creating unit, C2 ... Cumulative probability calculating unit, C3 ... Average value calculating unit, C4 ... Standard deviation calculating unit, C
5, C6 ... Division section.
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Claims (10)
される無線ゾーンに在圏する複数の移動局の各々との間
で無線通信を行う移動通信システムにおける、前記無線
基地局から前記移動局への下り方向のパケット送信に関
する下りパケットスケジューリング方法であって、前記
無線基地局が、パケット通信中の各移動局についての瞬
時の下り品質情報と各移動局についての当該瞬時の下り
品質情報の時間的な分布とに基づいて、前記複数の移動
局における各移動局についてのパケット送信の優先度を
表す送信優先度係数を算出する優先度係数算出工程と、
前記無線基地局が、各移動局についての送信優先度係数
と各移動局に対して送信すべきパケットの有無とに基づ
いて、送信すべきパケットを決定する決定工程と、を有
する下りパケットスケジューリング方法。1. In a mobile communication system for performing wireless communication between a wireless base station and each of a plurality of mobile stations located in a wireless zone formed by the wireless base station, the wireless base station to the mobile station. A downlink packet scheduling method for packet transmission in the downlink direction to the wireless base station, wherein the radio base station sets the time of instantaneous downlink quality information about each mobile station in packet communication and the instant downlink quality information about each mobile station. A priority coefficient calculation step of calculating a transmission priority coefficient indicating the priority of packet transmission for each mobile station in the plurality of mobile stations,
The downlink base station scheduling method, wherein the radio base station determines a packet to be transmitted based on a transmission priority coefficient for each mobile station and the presence / absence of a packet to be transmitted to each mobile station. .
基地局が、前記送信優先度係数として、各移動局につい
ての瞬時の下り品質情報の時間的な分布の累積確率値を
算出することを特徴とする請求項１記載の下りパケット
スケジューリング方法。2. In the priority coefficient calculating step, the radio base station calculates, as the transmission priority coefficient, a cumulative probability value of a temporal distribution of instantaneous downlink quality information for each mobile station. The downlink packet scheduling method according to claim 1, characterized in that.
基地局が、前記各移動局についての瞬時の下り品質情
報、前記各移動局についての瞬時の下り品質情報の時間
的な分布から得られる当該瞬時の下り品質情報の平均値
及び当該瞬時の下り品質情報の標準偏差に基づいて、前
記各移動局についての送信優先度係数を算出することを
特徴とする請求項１記載の下りパケットスケジューリン
グ方法。3. In the priority coefficient calculation step, the radio base station obtains from the instantaneous downlink quality information about each mobile station and the temporal distribution of the instantaneous downlink quality information about each mobile station. 2. The downlink packet scheduling method according to claim 1, wherein the transmission priority coefficient for each mobile station is calculated based on the average value of the instantaneous downlink quality information and the standard deviation of the instantaneous downlink quality information. .
基地局が、前記送信優先度係数として、前記瞬時の下り
品質情報と、当該瞬時の下り品質情報の平均値及び当該
下り品質情報の標準偏差の積との比を算出することを特
徴とする請求項３記載の下りパケットスケジューリング
方法。4. In the priority coefficient calculation step, the radio base station uses the instantaneous downlink quality information, the average value of the instantaneous downlink quality information, and the standard of the downlink quality information as the transmission priority coefficient. 4. The downlink packet scheduling method according to claim 3, wherein a ratio with a product of deviations is calculated.
地局から送信するリファレンスチャネルの信号電力対干
渉電力比、前記移動局から前記無線基地局に送信される
推奨の変調・符号化レベル、下り回線で各移動局との間
に設定される付随個別チャネルの送信電力レベル、前記
無線基地局から送信するリファレンスチャネルの受信信
号電力レベル、又は前記無線基地局から送信するリファ
レンスチャネルの受信信号電力対帯域内信号電力比の何
れかであることを特徴とする請求項１〜４の何れか１項
に記載の下りパケットスケジューリング方法。5. The instantaneous downlink quality information includes a signal power to interference power ratio of a reference channel transmitted from the radio base station, a recommended modulation / coding level transmitted from the mobile station to the radio base station, The transmission power level of the associated dedicated channel set with each mobile station on the downlink, the reception signal power level of the reference channel transmitted from the radio base station, or the reception signal power of the reference channel transmitted from the radio base station. 5. The downlink packet scheduling method according to claim 1, wherein the downlink packet scheduling method is any one of in-band signal power ratio.
する複数の移動局の各々との間で無線通信を行うととも
に、当該無線通信における前記移動局への下り方向のパ
ケット送信の際に下りパケットスケジューリングを行う
無線基地局であって、パケット通信中の各移動局につい
ての瞬時の下り品質情報と各移動局についての当該瞬時
の下り品質情報の時間的な分布とに基づいて、前記複数
の移動局における各移動局についてのパケット送信の優
先度を表す送信優先度係数を算出する優先度係数算出手
段と、各移動局についての送信優先度係数と各移動局に
対して送信すべきパケットの有無とに基づいて、送信す
べきパケットを決定する決定手段と、を備えた無線基地
局。6. A wireless communication is performed with each of a plurality of mobile stations existing in a wireless zone formed by the own station, and at the time of downlink packet transmission to the mobile station in the wireless communication. A radio base station for performing downlink packet scheduling, wherein the plurality of mobile stations based on the instantaneous downlink quality information about each mobile station during packet communication and the temporal distribution of the instantaneous downlink quality information about each mobile station Priority coefficient calculating means for calculating a transmission priority coefficient representing the priority of packet transmission for each mobile station in the mobile station, and a transmission priority coefficient for each mobile station and a packet to be transmitted to each mobile station. And a determining unit that determines a packet to be transmitted based on the presence or absence of the wireless base station.
先度係数として、各移動局についての瞬時の下り品質情
報の時間的な分布の累積確率値を算出することを特徴と
する請求項６記載の無線基地局。7. The priority coefficient calculation means calculates, as the transmission priority coefficient, a cumulative probability value of a temporal distribution of instantaneous downlink quality information for each mobile station. The described wireless base station.
局についての瞬時の下り品質情報、前記各移動局につい
ての瞬時の下り品質情報の時間的な分布から得られる当
該瞬時の下り品質情報の平均値及び当該瞬時の下り品質
情報の標準偏差に基づいて、前記各移動局についての送
信優先度係数を算出することを特徴とする請求項６記載
の無線基地局。8. The priority coefficient calculation means obtains the instantaneous downlink quality information for each mobile station and the instantaneous downlink quality information obtained from the temporal distribution of the instantaneous downlink quality information for each mobile station. 7. The radio base station according to claim 6, wherein the transmission priority coefficient for each mobile station is calculated based on the average value of the above and the standard deviation of the instantaneous downlink quality information.
先度係数として、前記瞬時の下り品質情報と、当該瞬時
の下り品質情報の平均値及び当該下り品質情報の標準偏
差の積との比を算出することを特徴とする請求項８記載
の無線基地局。9. The priority coefficient calculating means uses, as the transmission priority coefficient, a ratio of the instantaneous downlink quality information to a product of an average value of the instantaneous downlink quality information and a standard deviation of the downlink quality information. 9. The wireless base station according to claim 8, wherein
基地局から送信するリファレンスチャネルの信号電力対
干渉電力比、前記移動局から前記無線基地局に送信され
る推奨の変調・符号化レベル、下り回線で各移動局との
間に設定される付随個別チャネルの送信電力レベル、前
記無線基地局から送信するリファレンスチャネルの受信
信号電力レベル、又は前記無線基地局から送信するリフ
ァレンスチャネルの受信信号電力対帯域内信号電力比の
何れかであることを特徴とする請求項６〜９の何れか１
項に記載の無線基地局。10. The instantaneous downlink quality information includes a signal power to interference power ratio of a reference channel transmitted from the radio base station, a recommended modulation / coding level transmitted from the mobile station to the radio base station, The transmission power level of the associated dedicated channel set with each mobile station on the downlink, the reception signal power level of the reference channel transmitted from the radio base station, or the reception signal power of the reference channel transmitted from the radio base station. It is any one of the signal power ratio with respect to a band, The one of Claims 6-9 characterized by the above-mentioned.
The radio base station according to item.
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