JP2010232819A - Retransmission control method and radio communication device - Google Patents

Retransmission control method and radio communication device Download PDF

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JP2010232819A
JP2010232819A JP2009076294A JP2009076294A JP2010232819A JP 2010232819 A JP2010232819 A JP 2010232819A JP 2009076294 A JP2009076294 A JP 2009076294A JP 2009076294 A JP2009076294 A JP 2009076294A JP 2010232819 A JP2010232819 A JP 2010232819A
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JP5115750B2 (en
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Takayuki Tsutsumi
貴之 堤
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NEC Platforms Ltd
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Abstract

<P>PROBLEM TO BE SOLVED: To achieve an efficient fallback in radio communication. <P>SOLUTION: A plurality of communication rates in radio communication and retransmission upper limits for making a maximum required time of data transmission at each communication rate common are associated with each other and set in a table. A communication rate of transmission data is determined (S1), and a retransmission upper limit corresponding to the communication rate is obtained from the table to be set as an existing retransmission upper limit (S2). The number of retransmissions of transmission data at the communication rate is counted (S6), and when the number of retransmissions exceeds the existing retransmission upper limit (S7), the communication rate is reduced to a lower communication rate based on the table (S8). The existing retransmission upper limit is updated by the retransmission upper limit corresponding to the reduced communication rate (S9), and the transmission data is retransmitted at the reduced communication rate (S3). <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

本発明は、無線通信における再送制御に関する。   The present invention relates to retransmission control in wireless communication.

無線通信のデータ送信が失敗した際に、そのデータを送信し直すという再送制御が知られている。通信速度(通信レート)が可変の環境では、再送してもデータが到達しない場合の対策として、再送の通信速度を現状から減速するフォールバック(Fallback)機能がある。   Retransmission control is known in which when wireless communication data transmission fails, the data is retransmitted. In an environment where the communication speed (communication rate) is variable, there is a fallback function that reduces the communication speed of retransmission from the current state as a countermeasure when data does not arrive even after retransmission.

上記のフォールバック機能に関連する技術に、例えば、後述の特許文献1に記載のものがある。同文献の技術は、ファクシミリ通信において、再送が同一ページにつき所定回数行われた場合に、通信速度を1レベル下げて再送するというものである。   As a technique related to the fallback function, for example, there is one described in Patent Document 1 described later. The technique of this document is to retransmit at a lower communication speed by one level when retransmission is performed a predetermined number of times for the same page in facsimile communication.

特開昭60−251760号公報JP-A-60-251760

上記のフォールバック機能によれば、再送が成功しやすくなる。しかしながら、通信速度を現状より下げて再送するため、元の速度にて再送を行った場合に比べ所要時間が長引く可能性がある。   According to the fallback function described above, retransmission is easy to succeed. However, since retransmission is performed at a lower communication speed than the current state, the required time may be longer than when retransmission is performed at the original speed.

ここで、図6に、通信速度と転送完了時間との関係を例示する。図示の例は、IEEE802.11g準拠の無線通信において、12キロビット(1500バイト)のデータを送信することを想定したものである。「転送完了時間」は、データ送信の開始からそのデータの到達確認(ACK)を受信するまでの所要時間を表す。転送完了時間の「最小」は、再送が発生しない場合の所要時間を表し、「最大」は、7回の再送を含めた所要時間を表す。「変動範囲」は、転送完了時間の「最大」と「最小」との差を表す。   Here, FIG. 6 illustrates the relationship between the communication speed and the transfer completion time. In the illustrated example, it is assumed that data of 12 kilobits (1500 bytes) is transmitted in wireless communication compliant with IEEE802.11g. “Transfer completion time” represents a required time from the start of data transmission until reception of the arrival confirmation (ACK) of the data. “Minimum” of the transfer completion time represents a required time when no retransmission occurs, and “Maximum” represents a required time including seven retransmissions. The “variation range” represents a difference between “maximum” and “minimum” of the transfer completion time.

図示の変動範囲に関し、例えば、最も高速の54Mbpsの場合の1.56msと、最も低速の1Mbpsの84msとでは約50倍もの差がある。このように、一定回数の再送を想定した場合の変動範囲は、低速の通信帯域ほど大きくなる。そのため、上記特許文献1の技術のように、再送が一定回数に達するごとにフォールバック(減速)する方法では、再送が成功するまでに時間が掛かりやすい。   Regarding the fluctuation range shown in the figure, for example, there is a difference of about 50 times between 1.56 ms for the fastest 54 Mbps and 84 ms for the slowest 1 Mbps. Thus, the fluctuation range when assuming a certain number of retransmissions becomes larger as the communication bandwidth is lower. Therefore, in the method of performing fallback (deceleration) every time the retransmission reaches a certain number of times as in the technique of Patent Document 1, it is likely to take time until the retransmission is successful.

そこで、本発明は、無線通信において効率の良いフォールバックを実現するための再送制御方法および無線通信装置を提供することを目的とする。   Accordingly, an object of the present invention is to provide a retransmission control method and a wireless communication apparatus for realizing efficient fallback in wireless communication.

本発明に係る再送制御方法は、無線通信の複数の通信速度と、当該各通信速度によるデータ送信の最大所要時間を共通にするための再送上限値との対応をテーブルに設定し、送信データの通信速度を決定して当該通信速度に対応する再送上限値を前記テーブルから取得し、当該取得した再送上限値を現行の再送上限値として設定し、前記通信速度による前記送信データの再送回数をカウントし、前記再送回数が前記現行の再送上限値を超える場合、前記通信速度を前記テーブルに基づくより低い通信速度に減速し、当該減速した通信速度に対応する再送上限値により前記現行の再送上限値を更新し、前記減速した通信速度により前記送信データを再送するという方法である。   In the retransmission control method according to the present invention, a correspondence between a plurality of communication speeds of wireless communication and a retransmission upper limit value for sharing the maximum required time for data transmission at each communication speed is set in a table. The communication speed is determined, the retransmission upper limit value corresponding to the communication speed is acquired from the table, the acquired retransmission upper limit value is set as the current retransmission upper limit value, and the number of retransmissions of the transmission data at the communication speed is counted. When the number of retransmissions exceeds the current retransmission upper limit value, the communication speed is reduced to a lower communication speed based on the table, and the current retransmission upper limit value is determined by the retransmission upper limit value corresponding to the reduced communication speed. The transmission data is retransmitted at the reduced communication speed.

本発明に係る無線通信装置は、無線通信の複数の通信速度と、当該各通信速度によるデータ送信の最大所要時間を共通にするための再送上限値との対応を表すテーブルと、送信データの通信速度を決定して当該通信速度に対応する再送上限値を前記テーブルから取得する制御部と、前記取得された再送上限値を現行の再送上限値として設定し、前記通信速度による前記送信データの再送回数をカウントし、前記再送回数が前記現行の再送上限値を超える場合、前記通信速度を前記テーブルに基づくより低い通信速度に減速し、当該減速した通信速度に対応する再送上限値により前記現行の再送上限値を更新し、前記減速した通信速度により前記送信データを再送する無線通信部とを備える。   The wireless communication apparatus according to the present invention includes a table indicating correspondence between a plurality of communication speeds of wireless communication and a retransmission upper limit value for sharing the maximum required time for data transmission at each communication speed, and communication of transmission data. A control unit that determines a speed and acquires a retransmission upper limit value corresponding to the communication speed from the table; and sets the acquired retransmission upper limit value as a current retransmission upper limit value, and retransmits the transmission data at the communication speed When the number of retransmissions exceeds the current retransmission upper limit value, the communication speed is reduced to a lower communication speed based on the table, and the current upper limit value corresponding to the reduced communication speed is A wireless communication unit that updates a retransmission upper limit value and retransmits the transmission data at the reduced communication speed.

本発明によれば、無線通信において効率の良いフォールバックを実現することができる。   According to the present invention, efficient fallback can be realized in wireless communication.

本発明の実施形態における無線通信装置のブロック図である。It is a block diagram of the radio | wireless communication apparatus in embodiment of this invention. 本発明の実施形態における再送回数テーブルの説明図である。It is explanatory drawing of the frequency | count table of retransmissions in embodiment of this invention. 本発明の実施形態の動作手順を示すフローチャートである。It is a flowchart which shows the operation | movement procedure of embodiment of this invention. 本発明の他の実施形態の動作手順を示すフローチャートである。It is a flowchart which shows the operation | movement procedure of other embodiment of this invention. 本発明の他の実施形態におけるテーブル更新に関するフローチャートである。It is a flowchart regarding the table update in other embodiment of this invention. IEEE802.11準拠の無線通信における通信速度および転送完了時間に関する説明図である。It is explanatory drawing regarding the communication speed and transfer completion time in the radio | wireless communication based on IEEE802.11.

図1に、本発明の実施形態における無線通信装置100の構成を示す。無線通信装置100は、例えば、無線基地局あるいは無線端末である。   FIG. 1 shows a configuration of a wireless communication apparatus 100 according to an embodiment of the present invention. The radio communication device 100 is, for example, a radio base station or a radio terminal.

再送回数テーブル106は、複数の通信速度と各通信速度によるデータ送信の所要時間を共通にするための再送上限値との対応を表す情報であり、無線通信装置100の記憶デバイスに格納されている。制御部101は、後述する再送部104からの要求により再送回数テーブル106を検索し、検出された再送上限値を無線通信部108へ供給する。また、この再送上限値に対応の通信速度を通信速度記録部107へ記録する。   The number-of-retransmissions table 106 is information representing correspondence between a plurality of communication speeds and a retransmission upper limit value for sharing the time required for data transmission at each communication speed, and is stored in the storage device of the wireless communication apparatus 100. . The control unit 101 searches the retransmission count table 106 in response to a request from the retransmission unit 104 described later, and supplies the detected retransmission upper limit value to the wireless communication unit 108. Further, the communication speed corresponding to the retransmission upper limit value is recorded in the communication speed recording unit 107.

無線通信部108において、送信判定部102は、受信局からの到達確認(ACK)の有無をもとにデータ送信の成否を判定する。再送部104は、送信エラーが発生した場合に、制御部101から供給された再送上限値の回数を限度として、送信データ記憶部105のデータを再送する。また、再送回数が上限を超える場合は、制御部101に対し新たな再送上限値を要求する。通信速度制御部103は、再送回数が上限を超えた場合に新たに適用される通信速度を通信速度記録部107から読み出し、通信速度を減速させる。   In wireless communication unit 108, transmission determination unit 102 determines the success or failure of data transmission based on the presence or absence of arrival confirmation (ACK) from the receiving station. When a transmission error occurs, the retransmission unit 104 retransmits the data in the transmission data storage unit 105 up to the number of retransmission upper limit values supplied from the control unit 101. Further, when the number of retransmissions exceeds the upper limit, a new retransmission upper limit value is requested to the control unit 101. The communication speed control unit 103 reads a newly applied communication speed from the communication speed recording unit 107 when the number of retransmissions exceeds the upper limit, and reduces the communication speed.

図2に、再送回数テーブル106の一例を示す。図示の再送回数テーブル106は、1Mbpsから54Mbpsまでの通信速度を12レベルに分け、レベル別に再送上限値を規定したものである。再送回数テーブル106の再送上限値は、前述したように、各通信速度によるデータ送信の最大所要時間を共通にするよう設定されている。以下、テーブルの設定について説明する。   FIG. 2 shows an example of the retransmission number table 106. The illustrated retransmission count table 106 divides the communication speed from 1 Mbps to 54 Mbps into 12 levels and defines the retransmission upper limit value for each level. As described above, the upper limit of retransmission in the retransmission count table 106 is set so that the maximum required time for data transmission at each communication speed is shared. The table setting will be described below.

送信データのデータ量をB[bit]、通信速度をV[bps]、再送を含めた送信回数の合計をN回、データの送信開始からACKを受信するまでの所要時間の最大値をT[sec](最大所要時間T)とした場合、次の式(1)が成り立つ。
T=N×B/V …(1)
The data amount of transmission data is B [bit], the communication speed is V [bps], the total number of transmissions including retransmission is N times, and the maximum time required from the start of data transmission to the reception of ACK is T [ sec] (maximum required time T), the following equation (1) holds.
T = N × B / V (1)

また、再送回数Rnは次の式(2)により表される。
Rn=N−1 …(2)
The number of retransmissions Rn is expressed by the following equation (2).
Rn = N-1 (2)

上記式(1)及び(2)より、再送上限値Rmaxは、次式(3)のように定義される。
max=(V×T/B)−1 …(3)
From the above equations (1) and (2), the retransmission upper limit R max is defined as the following equation (3).
R max = (V × T / B) −1 (3)

図2の例では、データ量Bが12キロビット(1500バイト)、最大所要時間Tが12msであるとした場合の再送上限値Rmaxが、通信速度のレベル別に設定されている。図示のテーブル設定によれば、例えば、通信速度18Mbpsの場合は、17回を上限として再送を行うことができる。そして、17回目の再送でも到達確認が得られない場合は、通信速度を現行の18Mbpsより減速して再送を行うことになる。 In the example of FIG. 2, the retransmission upper limit R max when the data amount B is 12 kilobits (1500 bytes) and the maximum required time T is 12 ms is set for each communication speed level. According to the illustrated table setting, for example, when the communication speed is 18 Mbps, retransmission can be performed up to 17 times. If the arrival confirmation cannot be obtained even after the 17th retransmission, the communication speed is reduced from the current 18 Mbps and the retransmission is performed.

なお、最大所要時間Tとして、通信速度の最小値Vminによるデータ量Bの送信に要する時間Tminを適用した場合、再送上限値Rmaxは、次式(4)により表される。
min=B/Vmin
max=(V×Tmin/B)−1=(V/Vmin)−1 …(4)
When the time T min required for transmitting the data amount B with the minimum value V min of the communication speed is applied as the maximum required time T, the retransmission upper limit R max is expressed by the following equation (4).
T min = B / V min
R max = (V × T min / B) −1 = (V / V min ) −1 (4)

図2の再送回数テーブル106に適用された最大所要時間T(12ms)は、上記のTminに相当する。 Maximum duration T that is applied to the number of retransmissions table 106 in FIG. 2 (12 ms) corresponds to the above T min.

図3に示すフローチャートを参照して、上記構成の無線通信装置100の動作を説明する。無線通信装置100は、データ送信に適用する通信速度を決定し(ステップS1)、その通信速度に対応の再送上限値(Rmax)を再送回数テーブル106から取得する(ステップS2)。また、再送回数のカウント値(Rn)をゼロにリセットする(ステップS3)。 With reference to the flowchart shown in FIG. 3, the operation of the wireless communication apparatus 100 configured as described above will be described. Radio communication apparatus 100 determines a communication speed to be applied to data transmission (step S1), and obtains a retransmission upper limit (R max ) corresponding to the communication speed from retransmission number table 106 (step S2). Further, the count value (Rn) of the number of retransmissions is reset to zero (step S3).

無線通信装置100は、データ送信を開始し(ステップS4)、受信局からのACKを待つ(ステップS5)。そして、所定時間内にACKが得られない場合は、データの再送を行うが、それに先立ち以下の処理を行う。   Radio communication apparatus 100 starts data transmission (step S4) and waits for an ACK from the receiving station (step S5). If ACK is not obtained within a predetermined time, data is retransmitted, but the following processing is performed prior to that.

まず、再送回数のカウント値を1加算し(ステップS6)、加算後の再送回数が前述の再送上限値を超えるか否かを確認する。再送回数が上限を超えない場合は(ステップS7:No)、現行の通信速度により再送を行う(ステップS4)。   First, 1 is added to the count value of the number of retransmissions (step S6), and it is confirmed whether or not the number of retransmissions after the addition exceeds the above-described retransmission upper limit value. If the number of retransmissions does not exceed the upper limit (step S7: No), retransmission is performed at the current communication speed (step S4).

一方、再送回数が上限を超える場合(ステップS7:Yes)、無線通信装置100は、現行の通信速度より低速の通信速度を再送回数テーブル106から選択し、それを新たな通信速度として認識する(ステップS8)。また、新たな通信速度に対応の再送上限値を再送回数テーブル106から取得して現行の再送上限値を更新する(ステップS9)。   On the other hand, when the number of retransmissions exceeds the upper limit (step S7: Yes), radio communication apparatus 100 selects a communication speed lower than the current communication speed from retransmission number table 106, and recognizes it as a new communication speed ( Step S8). Further, the retransmission upper limit value corresponding to the new communication speed is acquired from the retransmission count table 106, and the current retransmission upper limit value is updated (step S9).

より具体的には、図2より、例えば通信速度18Mbpsによる17回目の再送でもACKが得られない場合、現行の18Mbpsを、それより1レベル低速の12Mbps、あるいは2レベル低速の11Mbpsなどに変更する。そして、変更後の通信速度に関し再送回数テーブル106に設定されている再送上限値を、新たな上限として認識する。   More specifically, from FIG. 2, for example, if ACK is not obtained even at the 17th retransmission at a communication speed of 18 Mbps, the current 18 Mbps is changed to 12 Mbps, which is one level slower than that, or 11 Mbps, which is two levels slower than that. . Then, the retransmission upper limit value set in the retransmission count table 106 regarding the changed communication speed is recognized as a new upper limit.

無線通信装置100は、上記のようにして通信速度および再送上限値を更新すると、再送回数のカウント値をゼロにリセットし(ステップS3)、減速した通信速度により再送を行う(ステップS4)。   When wireless communication apparatus 100 updates the communication speed and retransmission upper limit as described above, wireless communication apparatus 100 resets the count value of the number of retransmissions to zero (step S3), and performs retransmission at the reduced communication speed (step S4).

以上説明したように、本実施形態によれば、再送回数テーブル106を用いてフォールバックを行うことから、通信速度の違いによる最大所要時間の偏りが抑制される。これにより、再送時のフォールバックを効率よく行うことができる。   As described above, according to the present embodiment, the fallback is performed using the retransmission number table 106, and thus the deviation of the maximum required time due to the difference in communication speed is suppressed. Thereby, fallback at the time of retransmission can be performed efficiently.

(他の実施形態)
本発明の他の実施形態を説明する。この実施形態は、再送回数テーブル106を無線通信の現状に応じて動的に変化させるというものである。そのために、無線通信装置100は、通信速度の減速回数をカウントする手段と、減速回数に応じて再送回数テーブル106の再送上限値を更新する手段をさらに備える。
(Other embodiments)
Another embodiment of the present invention will be described. In this embodiment, the retransmission count table 106 is dynamically changed according to the current state of wireless communication. For this purpose, radio communication apparatus 100 further includes means for counting the number of times of reduction in communication speed and means for updating the retransmission upper limit value in retransmission number table 106 according to the number of times of deceleration.

図4に、本実施形態の動作手順を示す。本実施形態の手順は、前述の実施形態のもの(図3)から以下の動作が追加される。   FIG. 4 shows an operation procedure of the present embodiment. In the procedure of this embodiment, the following operations are added to those of the above-described embodiment (FIG. 3).

無線通信装置100は、データ送信の通信速度および再送上限値を設定後(ステップS1,S2)、減速回数のカウント値Fnをゼロにリセットする(ステップS101)。また、再送回数が上限を超えることにより減速を行う都度(ステップS8)、減速回数Fnを1ずつ加算していく(ステップS102)。その後、ACKを受信したとき(ステップS5:Yes)、後述する手順により、再送回数テーブル106における再送上限値の設定を更新する(ステップS103)。   After setting the data transmission communication speed and the retransmission upper limit (steps S1 and S2), the wireless communication device 100 resets the count value Fn of the number of decelerations to zero (step S101). Each time deceleration is performed when the number of retransmissions exceeds the upper limit (step S8), the number of decelerations Fn is incremented by 1 (step S102). Thereafter, when ACK is received (step S5: Yes), the setting of the retransmission upper limit value in the retransmission number table 106 is updated by the procedure described later (step S103).

図5に示すフローチャートを参照して、テーブルの更新手順を説明する。無線通信装置100は、減速回数Fnのカウント値がゼロかどうかを確認する(ステップS103-1)。その結果、減速回数Fnがゼロの場合、すなわち再送回数が1度も上限を超えることなくデータ送信が完了した場合は、再送回数テーブル106の再送上限値を全体的に下げるように更新する(ステップS103-2)。この更新方法は任意であるが、例えば、次の方法を採用することができる。   The table update procedure will be described with reference to the flowchart shown in FIG. The wireless communication device 100 confirms whether the count value of the number of times of deceleration Fn is zero (step S103-1). As a result, when the number of decelerations Fn is zero, that is, when the data transmission is completed without exceeding the upper limit of the number of retransmissions, the retransmission upper limit value of the retransmission number table 106 is updated so as to be lowered as a whole (step S103-2). Although this update method is arbitrary, for example, the following method can be adopted.

その方法は、現行の再送上限値Rmaxと、ACK受信時点での再送回数Rn(≦Rmax)との差に応じて、テーブルの再送上限値の設定を更新するというものである。この更新のために、まず、再送回数テーブル106に適用されている最大所要時間Tを、再送回数Rnに基づく値Tnに変更する。変更後の最大所要時間Tnは、前述の式(1)を基づく次式(5)により得られる。 The method is to update the setting of the retransmission upper limit value in the table in accordance with the difference between the current retransmission upper limit value R max and the number of retransmissions Rn (≦ R max ) at the time of ACK reception. For this update, first, the maximum required time T applied to the retransmission count table 106 is changed to a value Tn based on the retransmission count Rn. The maximum required time Tn after the change is obtained by the following equation (5) based on the above equation (1).

Tn=(Rn+1)×B/Vn …(5)
上記式(5)によれば、再送回数Rnが少ないほど、すなわち再送回数Rnと上限(Rmax)との差が大きいほど、最大所要時間Tnが短くなる。上限との差が最も大きい再送回数Rn「0」の場合は、テーブルの設定が現状のものに維持される。
Tn = (Rn + 1) × B / Vn (5)
According to the above equation (5), the smaller the number of retransmissions Rn, that is, the greater the difference between the number of retransmissions Rn and the upper limit (R max ), the shorter the maximum required time Tn. When the number of retransmissions Rn is “0” having the largest difference from the upper limit, the table setting is maintained as it is.

続いて、前述の式(3)と上記式(5)とに基づく次式(6)により、各通信速度Vxの再送上限値Rxmaxを算出する。 Subsequently, the retransmission upper limit Rx max of each communication speed Vx is calculated by the following equation (6) based on the above equation (3) and the above equation (5).

Rxmax=(Vx×Tn/B)−1=Vx((Rn+1)/Vn)−1 …(6)
上記(6)から得られる各通信速度の再送上限値を再送回数テーブル106に設定し直すことで、テーブルの再送上限値を一律に下げるよう更新することができる。
Rx max = (Vx × Tn / B) −1 = Vx ((Rn + 1) / Vn) −1 (6)
By resetting the retransmission upper limit value of each communication speed obtained from the above (6) in the retransmission count table 106, it is possible to update the table so that the retransmission upper limit value is uniformly reduced.

無線通信装置100は、ACK受信時点での減速回数Fnが1回の場合は(図5のステップS103-3:No)、現状のテーブル設定を維持する。また、減速回数Fnが2回以上の場合は(図5のステップS103-3:Yes)、テーブルの再送上限値を一律に上げるよう更新する(ステップS103-4)。この更新の際は、例えば、現状の最大所要時間Tに規定値を加算する等により、現状より大きい値Tn´を用意する。そして、用意した最大所要時間Tn´を用いて、前述の(3)により各通信速度の新たな再送上限値を算出し、各算出値をテーブルに設定し直す。   When the number of times of deceleration Fn at the time of receiving the ACK is 1 (step S103-3: No in FIG. 5), the wireless communication device 100 maintains the current table setting. If the number of decelerations Fn is 2 or more (step S103-3: Yes in FIG. 5), the table is updated so as to increase the retransmission upper limit value uniformly (step S103-4). At the time of this update, for example, a value Tn ′ larger than the current value is prepared by adding a specified value to the current maximum required time T. Then, using the prepared maximum required time Tn ′, a new retransmission upper limit value for each communication speed is calculated according to the above (3), and each calculated value is reset in the table.

なお、図5の手順では、減速回数Fnが2回以上の場合に再送上限値を更新したが、この条件に限らず、減速が1回でも行われた場合に更新するようにしてもよい(S103-3:「Fn≧2」→「Fn≧1」)。   In the procedure of FIG. 5, the retransmission upper limit value is updated when the number of decelerations Fn is two or more. However, the upper limit is not limited to this condition, and may be updated when deceleration is performed even once ( S103-3: “Fn ≧ 2” → “Fn ≧ 1”).

本実施形態によれば、実際の通信状況を再送回数テーブル106に反映させることができる。   According to the present embodiment, the actual communication status can be reflected in the retransmission number table 106.

本発明の実施は、上記形態に限定されるものではなく、特許請求の範囲内で上記形態から適宜変形が可能である。例えば、再送回数テーブル106における通信速度のレベル分けは、図2に示す12レベルより少なくしてもよい。一例として、「1〜54Mbps」を「1〜6Mbps」,「9〜18Mbps」,「24〜54Mbps」の3つのレベルに分けることができる。このように分けた場合、再送上限値Rmaxの算出に用いる通信速度Vには、例えば、各レベル内での通信速度の平均値を適用すればよい。 The embodiment of the present invention is not limited to the above-described embodiment, and can be appropriately modified from the above-described embodiment within the scope of the claims. For example, the communication speed level division in the retransmission count table 106 may be less than the 12 levels shown in FIG. As an example, “1 to 54 Mbps” can be divided into three levels of “1 to 6 Mbps”, “9 to 18 Mbps”, and “24 to 54 Mbps”. In this case, for example, an average value of communication speeds within each level may be applied to the communication speed V used for calculating the retransmission upper limit value R max .

また、再送回数テーブル106に適用する最大所要時間Tは、図2のような通信速度の最小値(1Mbps)に基づく値に限らず、他の値であってもよい。   Further, the maximum required time T applied to the retransmission count table 106 is not limited to a value based on the minimum value (1 Mbps) of the communication speed as shown in FIG. 2, but may be another value.

本発明は、無線通信装置(100)の動作手順に対応したコンピュータプログラム、及び、そのプログラムが格納された記録媒体として実施することができる。   The present invention can be implemented as a computer program corresponding to the operation procedure of the wireless communication apparatus (100) and a recording medium storing the program.

本発明は、通信品質が保障されるベストエフォート型の無線ネットワークに好適である。   The present invention is suitable for a best-effort wireless network in which communication quality is guaranteed.

100 無線通信装置
101 制御部
102 送信判定部
103 通信速度制御部
104 再送部
105 送信データ記憶部
106 再送回数テーブル
107 通信速度記録部
108 無線通信部
100 wireless communication equipment
101 Control unit
102 Transmission judgment part
103 Communication speed controller
104 Retransmission part
105 Transmission data storage
106 Retransmission table
107 Communication speed recording section
108 Wireless communication unit

Claims (13)

無線通信の複数の通信速度と、当該各通信速度によるデータ送信の最大所要時間を共通にするための再送上限値との対応をテーブルに設定し、
送信データの通信速度を決定して当該通信速度に対応する再送上限値を前記テーブルから取得し、当該取得した再送上限値を現行の再送上限値として設定し、
前記通信速度による前記送信データの再送回数をカウントし、
前記再送回数が前記現行の再送上限値を超える場合、前記通信速度を前記テーブルに基づくより低い通信速度に減速し、当該減速した通信速度に対応する再送上限値により前記現行の再送上限値を更新し、
前記減速した通信速度により前記送信データを再送することを特徴とする再送制御方法。
Set a correspondence between a plurality of communication speeds of wireless communication and a retransmission upper limit value for making the maximum required time for data transmission at each communication speed in common,
Determine the communication speed of the transmission data, obtain the retransmission upper limit corresponding to the communication speed from the table, set the acquired retransmission upper limit as the current retransmission upper limit,
Count the number of retransmissions of the transmission data at the communication speed,
If the number of retransmissions exceeds the current retransmission upper limit, the communication speed is reduced to a lower communication speed based on the table, and the current retransmission upper limit is updated with the retransmission upper limit corresponding to the reduced communication speed. And
A retransmission control method, wherein the transmission data is retransmitted at the reduced communication speed.
さらに、前記送信データに関する到達確認を受信するまで前記通信速度の減速回数をカウントし、前記到達確認を受信したときの前記減速回数がゼロか否かを判別し、当該判別がゼロの場合は前記テーブルの再送上限値を該再送上限値以下に更新し、当該判別が否の場合は前記テーブルの再送上限値をより大きい値に更新することを特徴とする請求項1記載の再送制御方法。   Furthermore, the number of times of deceleration of the communication speed is counted until an arrival confirmation regarding the transmission data is received, and it is determined whether or not the number of decelerations is zero when the arrival confirmation is received. The retransmission control method according to claim 1, wherein the retransmission upper limit value of the table is updated to be equal to or less than the retransmission upper limit value, and if the determination is negative, the retransmission upper limit value of the table is updated to a larger value. 前記判別がゼロの場合に、前記現行の再送上限値と前記到達確認を受信したときの再送回数との差に応じて前記テーブルの再送上限値を更新することを特徴とする請求項2記載の再送制御方法。   3. The retransmission upper limit value in the table is updated according to a difference between the current retransmission upper limit value and the number of retransmissions when the arrival confirmation is received when the determination is zero. Retransmission control method. 前記テーブルの再送上限値Rmaxが、前記最大所要時間T、送信データのデータ量B、および、通信速度Vに基づく
max=(V×T/B)−1
により定義されることを特徴とする請求項1乃至3のいずれか1項に記載の再送制御方法。
The retransmission upper limit R max of the table is based on the maximum required time T, the data amount B of transmission data, and the communication speed V. R max = (V × T / B) −1
The retransmission control method according to claim 1, wherein the retransmission control method is defined by:
前記最大所要時間Tが、前記複数の通信速度における最小値による前記データ量Bの送信所要時間に対応することを特徴とする請求項4記載の再送制御方法。   5. The retransmission control method according to claim 4, wherein the maximum required time T corresponds to a required transmission time of the data amount B according to a minimum value at the plurality of communication speeds. 前記現行の再送上限値と前記到達確認を受信したときの再送回数Rnとの差に応じて前記テーブルの再送上限値を更新するとき、当該更新に用いる最大所要時間Tnを現行の通信速度Vnおよび前記送信データのデータ量Bに基づく
Tn=(Rn+1)×B/Vn
により求め、
当該更新により前記各通信速度Vxに設定すべき再送上限値Rxmax
Rxmax=(Vx×Tn/B)−1
により求めることを特徴とする請求項3記載の再送制御方法。
When the retransmission upper limit value of the table is updated according to the difference between the current retransmission upper limit value and the number of retransmissions Rn when the arrival confirmation is received, the maximum required time Tn used for the update is set to the current communication speed Vn and Based on data amount B of the transmission data Tn = (Rn + 1) × B / Vn
Sought by
The retransmission upper limit Rx max to be set for each communication speed Vx by the update is set as Rx max = (Vx × Tn / B) −1.
The retransmission control method according to claim 3, wherein the retransmission control method is obtained by:
無線通信の複数の通信速度と、当該各通信速度によるデータ送信の最大所要時間を共通にするための再送上限値との対応を表すテーブルと、
送信データの通信速度を決定して当該通信速度に対応する再送上限値を前記テーブルから取得する制御部と、
前記取得された再送上限値を現行の再送上限値として設定し、前記通信速度による前記送信データの再送回数をカウントし、前記再送回数が前記現行の再送上限値を超える場合、前記通信速度を前記テーブルに基づくより低い通信速度に減速し、当該減速した通信速度に対応する再送上限値により前記現行の再送上限値を更新し、前記減速した通信速度により前記送信データを再送する無線通信部とを備えることを特徴とする無線通信装置。
A table representing a correspondence between a plurality of communication speeds of wireless communication and a retransmission upper limit value for sharing the maximum required time for data transmission at each communication speed;
A control unit that determines a transmission speed of transmission data and obtains a retransmission upper limit corresponding to the communication speed from the table;
The acquired retransmission upper limit value is set as a current retransmission upper limit value, the number of retransmissions of the transmission data according to the communication speed is counted, and when the number of retransmissions exceeds the current retransmission upper limit value, the communication speed is set to A wireless communication unit that decelerates to a lower communication speed based on the table, updates the current retransmission upper limit value with a retransmission upper limit value corresponding to the reduced communication speed, and retransmits the transmission data at the reduced communication speed; A wireless communication apparatus comprising:
前記無線通信部は、さらに、前記送信データに関する到達確認を受信するまで前記通信速度の減速回数をカウントし、前記到達確認を受信したときの前記減速回数がゼロか否かを判別し、当該判別がゼロの場合は前記テーブルの再送上限値を該再送上限値以下に更新し、当該判別が否の場合は前記テーブルの再送上限値をより大きい値に更新することを特徴とする請求項7記載の無線通信装置。   The wireless communication unit further counts the number of times of deceleration of the communication speed until an arrival confirmation regarding the transmission data is received, determines whether the number of decelerations when the arrival confirmation is received is zero, 8. The retransmission upper limit value of the table is updated to be equal to or less than the retransmission upper limit value when is zero, and the retransmission upper limit value of the table is updated to a larger value when the determination is negative. Wireless communication device. 前記無線通信部は、前記判別がゼロの場合に、前記現行の再送上限値と前記到達確認を受信したときの再送回数との差に応じて前記テーブルの再送上限値を更新することを特徴とする請求項8記載の無線通信装置。   The wireless communication unit updates the retransmission upper limit value of the table according to a difference between the current retransmission upper limit value and the number of retransmissions when the arrival confirmation is received when the determination is zero, The wireless communication apparatus according to claim 8. 前記テーブルの再送上限値Rmaxが、前記最大所要時間T、送信データのデータ量B、および、通信速度Vに基づく
max=(V×T/B)−1
により定義されることを特徴とする請求項7乃至9のいずれか1項に記載の無線通信装置。
The retransmission upper limit R max of the table is based on the maximum required time T, the data amount B of transmission data, and the communication speed V. R max = (V × T / B) −1
The wireless communication apparatus according to claim 7, wherein the wireless communication apparatus is defined by:
前記最大所要時間Tが、前記複数の通信速度における最小値による前記データ量Bの送信所要時間に対応することを特徴とする請求項10記載の無線通信装置。   The wireless communication apparatus according to claim 10, wherein the maximum required time T corresponds to a required time for transmission of the data amount B according to a minimum value at the plurality of communication speeds. 前記無線通信部は、前記現行の再送上限値と前記到達確認を受信したときの再送回数Rnとの差に応じて前記テーブルの再送上限値を更新するとき、当該更新に用いる最大所要時間Tnを現行の通信速度Vnおよび前記送信データのデータ量Bに基づく
Tn=(Rn+1)×B/Vn
により求め、
当該更新により前記各通信速度Vxに設定すべき再送上限値Rxmax
Rxmax=(Vx×Tn/B)−1
により求めることを特徴とする請求項9記載の無線通信装置。
When the wireless communication unit updates the retransmission upper limit value in the table according to the difference between the current retransmission upper limit value and the number of retransmissions Rn when the arrival confirmation is received, the wireless communication unit sets a maximum required time Tn used for the update. Based on the current communication speed Vn and the data amount B of the transmission data Tn = (Rn + 1) × B / Vn
Sought by
The retransmission upper limit Rx max to be set for each communication speed Vx by the update is set as Rx max = (Vx × Tn / B) −1.
The wireless communication device according to claim 9, wherein the wireless communication device is obtained by:
コンピュータを請求項7乃至12のいずれか1項に記載の無線通信装置として機能させることを特徴とするプログラム。   A program for causing a computer to function as the wireless communication device according to any one of claims 7 to 12.
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