JP2005051713A

JP2005051713A - Packet transmission method and communication device

Info

Publication number: JP2005051713A
Application number: JP2003284333A
Authority: JP
Inventors: Yohei Inaba; 庸平稲葉
Original assignee: Mitsubishi Electric Corp
Current assignee: Mitsubishi Electric Corp
Priority date: 2003-07-31
Filing date: 2003-07-31
Publication date: 2005-02-24

Abstract

<P>PROBLEM TO BE SOLVED: To provide a packet transmission method for preventing a packet loss. <P>SOLUTION: The packet transmission method adopts an automatic repeat request (ARQ) as an error control technology and is configured to perform: a soft judgement value synthesizing step wherein an ACK/NACK judgement part of a packet transmission side communication device extracts HARQ-ACK information indicating "ACK" or "NACK" from a soft judgement value obtained as a demodulation result of a received signal and synthesizes a soft judgement value for each of all symbols indicating the relevant HARQ-ACK information; and a judgement step wherein the synthesization result of the soft discrimination value is compared with a predetermined threshold for judging the HARQ-ACK information, judging that the HARQ-ACK information is "NACK" when the synthesization result of the soft judgement value is lower than or equal with the threshold, and judging that the HARQ-ACK information is "ACK" when the synthesization result of the soft judging value is higher than (or higher than or equal with) the threshold. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

本発明は、誤り制御技術として自動再送要求（ＡＲＱ：Automatic Repeat Request）を採用する無線通信システムにおけるパケット伝送方法に関するものである。 The present invention relates to a packet transmission method in a wireless communication system that employs automatic repeat request (ARQ) as an error control technique.

以下、従来のパケット伝送方法について説明する。３ＧＰＰ（3rd Generation Partnership Project）においては、下り高速無線通信技術としてＨＳＤＰＡ（High Speed Downlink Packet Access）が規格で定められている。このＨＳＤＰＡでは、上り無線チャネルとしては、端末側からのＡＣＫ／ＮＡＣＫ情報，通信品質の情報（ＣＱＩ：Channel Quality Indicator）を伝送するためのチャネルとしてＨＳ−ＤＰＣＣＨ（High Speed - Dedicated Physical Control Channel）が規定されており、たとえば、基地局から端末局へのダウンリンク伝送において端末局が正しくパケットを受信できなかった場合、端末局が基地局に対して再送要求（ＮＡＣＫ）を行うことによって、通信の信頼性を高めている。また、下り無線チャネルとしては、データを伝送するためのチャネルとしてＨＳ−ＰＤＳＣＨ（High Speed - Physical Downlink Shared Channel）が規定されており、また、データ伝送を制御するためのチャネルとしてＨＳ−ＳＣＣＨ（High Speed - Shared Control Channel）が規定されている（下記非特許文献１参照）。 Hereinafter, a conventional packet transmission method will be described. In 3GPP (3rd Generation Partnership Project), HSDPA (High Speed Downlink Packet Access) is defined as a standard as a downlink high-speed wireless communication technology. In this HSDPA, HS-DPCCH (High Speed-Dedicated Physical Control Channel) is used as an uplink radio channel as a channel for transmitting ACK / NACK information from the terminal side and communication quality information (CQI: Channel Quality Indicator). For example, when a terminal station cannot correctly receive a packet in downlink transmission from the base station to the terminal station, the terminal station makes a retransmission request (NACK) to the base station, thereby Increases reliability. Also, as a downlink radio channel, HS-PDSCH (High Speed-Physical Downlink Shared Channel) is defined as a channel for transmitting data, and HS-SCCH (High Speed-Shared Control Channel) is defined (see Non-Patent Document 1 below).

ここで、上記従来のパケット伝送方法を採用する無線通信システム（基地局，端末局）の動作について説明する。まず、基地局からＨＳ−ＰＤＳＣＨ上に送信された信号を受け取った端末局では、受信信号を復調後、データとともに送信される誤り検出符号により誤り検出を行う。そして、受信データに誤りがない場合には、ＨＳ−ＤＰＣＣＨを使用してＡＣＫ信号を基地局に対して送信し、次データの送信を要求する。一方、受信データに誤りがある場合、端末局では、ＨＳ−ＤＰＣＣＨを使用してＮＡＣＫ信号を基地局に対して送信し、データの再送を要求する。なお、ＨＳ−ＤＰＣＣＨの送信電力は、送信する信号（ＡＣＫ信号，ＮＡＣＫ信号）によって決定される。 Here, the operation of a wireless communication system (base station, terminal station) that employs the conventional packet transmission method will be described. First, a terminal station that has received a signal transmitted on the HS-PDSCH from the base station performs error detection using an error detection code transmitted together with data after demodulating the received signal. If there is no error in the received data, an ACK signal is transmitted to the base station using HS-DPCCH, and a request for transmission of the next data is made. On the other hand, when there is an error in the received data, the terminal station transmits a NACK signal to the base station using HS-DPCCH, and requests retransmission of the data. Note that the transmission power of the HS-DPCCH is determined by a signal to be transmitted (ACK signal, NACK signal).

基地局では、受信したＨＳ−ＤＰＣＣＨ上の信号を復調し、ＡＣＫ／ＮＡＣＫ信号を合成する。合成したＡＣＫ／ＮＡＣＫ信号の軟判定値の正負によりＡＣＫまたはＮＡＣＫを判断し、たとえば、ＡＣＫを受信した場合は、ＨＳ−ＰＤＳＣＨにより次データを送信し、ＮＡＣＫを受信した場合は、ＨＳ−ＰＤＳＣＨによりデータを再送する。そして、送信するデータが次データか再送データかを示すために、受信したＡＣＫ／ＮＡＣＫ情報をＨＳ−ＳＣＣＨで送信する。 The base station demodulates the received HS-DPCCH signal and synthesizes an ACK / NACK signal. ACK or NACK is determined by the sign of the soft decision value of the combined ACK / NACK signal. For example, when ACK is received, the next data is transmitted by HS-PDSCH, and when NACK is received, by HS-PDSCH. Resend data. Then, the received ACK / NACK information is transmitted on the HS-SCCH to indicate whether the data to be transmitted is the next data or retransmission data.

また、端末局から送信されるＨＳ−ＤＰＣＣＨ信号の送信電力については、送信するＨＡＲＱ−ＡＣＫ信号に対応したΔＡＣＫまたはΔＮＡＣＫがＨＳ−ＤＰＣＣＨ送信電力増加量ΔＨＳ−ＤＰＣＣＨとして設定される。なお、ΔＡＣＫ，ΔＮＡＣＫは上位レイヤより設定される。 Also, for the transmission power of the HS-DPCCH signal transmitted from the terminal station, ΔACK or ΔNACK corresponding to the HARQ-ACK signal to be transmitted is set as the HS-DPCCH transmission power increase amount ΔHS-DPCCH. Note that ΔACK and ΔNACK are set by the upper layer.

３ＧＰＰ規格TS25.211 v5.1.03GPP standard TS25.211 v5.1.0

しかしながら、上記従来のパケット伝送方法においては、パケット受信側が再送を要求するためにＮＡＣＫ信号を送信した場合であっても、たとえば、無線通信路におけるフェージング等により誤りが発生し、パケット送信側で受信したＮＡＣＫ信号を誤って判定してしまうことがある。すなわち、ＮＡＣＫ信号が誤ってＡＣＫ信号と判定され、本来再送されるべきデータが送信されずに、次データが送信されてしまうことがある。そのため、パケット受信側において、データの欠落が発生する、という問題があった。また、再送データが送られてこないので、データの送信回数が増え、他通信への干渉が増加する、という問題もあった。 However, in the conventional packet transmission method described above, even when the packet receiving side transmits a NACK signal to request retransmission, an error occurs due to, for example, fading in the wireless communication path, and the packet transmitting side receives the packet. May be erroneously determined. That is, the NACK signal may be erroneously determined as an ACK signal, and the next data may be transmitted without transmitting the data that should be retransmitted. For this reason, there is a problem that data loss occurs on the packet receiving side. In addition, since retransmission data is not sent, there is a problem in that the number of data transmissions increases and interference with other communications increases.

本発明は、上記に鑑みてなされたものであって、フェージング等が発生し、無線通信路の状態が劣化した場合であっても、パケットの欠落を防止可能なパケット伝送方法を得ることを目的とする。 The present invention has been made in view of the above, and an object of the present invention is to provide a packet transmission method capable of preventing packet loss even when fading or the like occurs and the state of a wireless communication path deteriorates. And

上述した課題を解決し、目的を達成するために、本発明にかかるパケット伝送方法にあっては、誤り制御技術として自動再送要求（ＡＲＱ：Automatic Repeat Request）を採用する場合のパケット伝送方法であって、たとえば、パケット送信側の通信装置が、受信信号の復調結果として得られる軟判定値から「ＡＣＫ」または「ＮＡＣＫ」を示す応答情報を抽出し、当該応答情報を示す全シンボルの軟判定値を合成する軟判定値合成ステップと、前記軟判定値の合成結果と、前記応答情報を判定するための所定のしきい値と、を比較し、前記軟判定値の合成結果が前記しきい値以下（または未満）の場合、前記応答情報を「ＮＡＣＫ」と判定し、前記軟判定値の合成結果が前記しきい値より大きい（または以上）場合、前記応答情報を「ＡＣＫ」と判定する判定ステップと、を含むことを特徴とする。 In order to solve the above-described problems and achieve the object, the packet transmission method according to the present invention is a packet transmission method in the case of employing automatic repeat request (ARQ) as an error control technique. For example, the communication device on the packet transmission side extracts response information indicating “ACK” or “NACK” from the soft decision value obtained as a demodulation result of the received signal, and the soft decision values of all symbols indicating the response information A soft decision value combining step for combining the soft decision value, a combination result of the soft decision value, and a predetermined threshold value for determining the response information, and the combination result of the soft decision value is the threshold value. In the following (or less) case, the response information is determined as “NACK”, and when the combined result of the soft decision value is greater than (or greater than) the threshold value, the response information is determined as “ACK”. Characterized in that it comprises a determination step of, a.

この発明によれば、復調結果の信頼度（上記軟判定値の合成結果の大きさ）に応じて「ＡＣＫ」か「ＮＡＣＫ」か、を判定することとした。 According to the present invention, it is determined whether it is “ACK” or “NACK” according to the reliability of the demodulation result (the magnitude of the synthesis result of the soft decision value).

この発明によれば、パケット受信側通信装置が「ＮＡＣＫ」を送信した場合に、パケット送信側通信装置が受信信号を「ＡＣＫ」と判定してしまう誤りを回避できるので、すなわち、再送を要求されたにもかかわらず、再送データではなく次送信データを送信してしまう、という誤動作を回避できるので、たとえば、無線通信路の状態が劣化した場合であっても、パケット受信側通信装置におけるパケットの欠落を防止できる、という効果を奏する。 According to the present invention, when the packet receiving side communication apparatus transmits “NACK”, an error that the packet transmitting side communication apparatus determines that the received signal is “ACK” can be avoided, that is, retransmission is requested. In spite of this, it is possible to avoid a malfunction that the next transmission data is transmitted instead of the retransmission data. There is an effect that omission can be prevented.

以下に、本発明にかかるパケット伝送方法および通信装置（基地局，端末局）の実施の形態を図面に基づいて詳細に説明する。なお、この実施の形態によりこの発明が限定されるものではない。 Embodiments of a packet transmission method and a communication device (base station, terminal station) according to the present invention will be described below in detail with reference to the drawings. Note that the present invention is not limited to the embodiments.

実施の形態１．
図１は、本発明にかかるパケット伝送方法を実現するための実施の形態１のパケット送信側通信装置（基地局）の構成を示す図であり、特に、ＨＳ−ＤＰＣＣＨ上のＡＣＫ／ＮＡＣＫ信号を判定するための構成を示す図である。この通信装置は、受信信号と遅延プロファイル情報から受信信号に多重化されたＨＳ−ＤＰＣＣＨ信号を復調し、復調結果として軟判定値を生成する受信信号復調部１と、受信信号復調部１にて生成される軟判定値からＡＣＫ／ＮＡＣＫ信号（ＡＣＫ信号かＮＡＣＫ信号か）を判定するＡＣＫ／ＮＡＣＫ判定部２と、を備える。 Embodiment 1 FIG.
FIG. 1 is a diagram showing a configuration of a packet transmission side communication apparatus (base station) according to Embodiment 1 for realizing a packet transmission method according to the present invention. In particular, FIG. 1 shows an ACK / NACK signal on HS-DPCCH. It is a figure which shows the structure for determining. This communication apparatus demodulates an HS-DPCCH signal multiplexed on a received signal from the received signal and delay profile information, and generates a soft decision value as a demodulation result, and a received signal demodulating unit 1 An ACK / NACK determination unit 2 that determines an ACK / NACK signal (an ACK signal or a NACK signal) from the generated soft decision value.

ここで、上記通信装置の動作の概要を説明する。受信信号復調部１では、受信信号と遅延プロファイル情報を受け取り、逆拡散，位相推定，ＲＡＫＥ合成等を行うことによって、ＨＳ−ＤＰＣＣＨ信号の復調結果として軟判定値を生成する。ＡＣＫ／ＮＡＣＫ判定部２では、ＡＣＫ／ＮＡＣＫ判定用しきい値と、上記軟判定値のＨＡＲＱ−ＡＣＫ情報と、を用いて、受け取った信号がＡＣＫ信号かＮＡＣＫ信号かを判定する。そして、その判定結果を再送制御部（図示はしていない）に対して通知する。 Here, the outline | summary of operation | movement of the said communication apparatus is demonstrated. The received signal demodulator 1 receives the received signal and delay profile information, and performs a despreading, phase estimation, RAKE combining, etc., thereby generating a soft decision value as a demodulation result of the HS-DPCCH signal. The ACK / NACK determination unit 2 determines whether the received signal is an ACK signal or a NACK signal using the threshold for ACK / NACK determination and the HARQ-ACK information of the soft decision value. Then, the determination result is notified to a retransmission control unit (not shown).

つづいて、本実施の形態の特徴であるＡＣＫ／ＮＡＣＫ判定部２の処理を図面に従って詳細に説明する。図２は、ＡＣＫ／ＮＡＣＫ判定部２の処理を示すフローチャートである。 Next, processing of the ACK / NACK determination unit 2 that is a feature of the present embodiment will be described in detail with reference to the drawings. FIG. 2 is a flowchart showing processing of the ACK / NACK determination unit 2.

まず、ＡＣＫ／ＮＡＣＫ判定部２では、受信信号復調部１から出力されたＨＳ−ＤＰＣＣＨ信号の軟判定値を、ＨＡＲＱ−ＡＣＫ情報とＣＱＩ情報に分離し、ＨＡＲＱ−ＡＣＫ情報を示す全シンボルの軟判定値を合成する（ステップＳ１）。そして、軟判定値の合成結果（合成後のＨＡＲＱ−ＡＣＫ情報）と、外部より設定されるＡＣＫ／ＮＡＣＫ判定用しきい値と、を比較する（ステップＳ２）。たとえば、ＨＳ−ＤＰＣＣＨ信号のＨＡＲＱ−ＡＣＫ情報は、ＡＣＫ信号が硬判定値：「１」、ＮＡＣＫ信号が硬判定値：「０」で示されるため、上記比較の結果、合成後のＨＡＲＱ−ＡＣＫ情報がＡＣＫ／ＮＡＣＫ判定用しきい値以下（または未満）の場合は、判定結果を「ＮＡＣＫ」とし（ステップＳ３）、合成後のＨＡＲＱ−ＡＣＫ情報がＡＣＫ／ＮＡＣＫ判定用しきい値より大きい（または以上）場合は、判定結果を「ＡＣＫ」とする（ステップＳ４）。 First, the ACK / NACK determination unit 2 separates the soft decision value of the HS-DPCCH signal output from the received signal demodulation unit 1 into HARQ-ACK information and CQI information, and softens all symbols indicating HARQ-ACK information. The determination values are synthesized (step S1). Then, the combination result of the soft decision value (HARQ-ACK information after the combination) is compared with the threshold for ACK / NACK determination set from the outside (step S2). For example, in the HARQ-ACK information of the HS-DPCCH signal, the ACK signal is indicated by a hard decision value: “1”, and the NACK signal is indicated by a hard decision value: “0”. If the information is equal to or less than (or less than) the threshold for ACK / NACK determination, the determination result is “NACK” (step S3), and the combined HARQ-ACK information is larger than the threshold for ACK / NACK determination ( In the case of (or above), the determination result is “ACK” (step S4).

図３は、ＡＣＫ／ＮＡＣＫ判定処理の一例を示す図である。たとえば、従来方式の符号による判定においては、ＨＡＲＱ−ＡＣＫ情報１０２，１０３は「ＮＡＣＫ」と判定され、ＨＡＲＱ−ＡＣＫ情報１０４，１０５は「ＡＣＫ］と判定される。しかしながら、ＨＡＲＱ−ＡＣＫ情報１０２と１０５は信号電力が小さいため、信号に対する信頼度が低く、送信側が送信した信号と、受信側で判定したＡＣＫ／ＮＡＣＫ信号の判定結果と、が異なっている可能性が高いと考えられる。そこで、本実施の形態においては、受信したＨＳ−ＤＰＣＣＨ信号における上記合成後のＨＡＲＱ−ＡＣＫ情報と、ＡＣＫ／ＮＡＣＫ判定用しきい値と、を比較し、たとえば、合成後の信号電力が一定以上のＡＣＫ信号のみを「ＡＣＫ」と判定する。すなわち、ＡＣＫ／ＮＡＣＫ情報１０５のように従来方式では「ＡＣＫ」と判定された信号であっても、本実施の形態では、上記しきい値による判定によって「ＮＡＣＫ」と判定される場合がある。 FIG. 3 is a diagram illustrating an example of an ACK / NACK determination process. For example, in the determination by the code of the conventional method, the HARQ-ACK information 102 and 103 is determined as “NACK”, and the HARQ-ACK information 104 and 105 is determined as “ACK.” However, the HARQ-ACK information 102 and Since the signal power is low at 105, the reliability of the signal is low, and it is highly likely that the signal transmitted from the transmission side is different from the determination result of the ACK / NACK signal determined at the reception side. In the present embodiment, the combined HARQ-ACK information in the received HS-DPCCH signal is compared with the threshold for ACK / NACK determination, and, for example, an ACK with a combined signal power exceeding a certain level is compared. Only the signal is determined as “ACK”. That is, even in the case of a signal that is determined as “ACK” in the conventional method, such as ACK / NACK information 105, in this embodiment, it may be determined as “NACK” by the determination based on the threshold value.

このように、本実施の形態においては、復調結果の信頼度に応じてＡＣＫ／ＮＡＣＫ信号を判定することとした。これにより、パケット受信側通信装置がＮＡＣＫ信号を送信した場合に、パケット送信側通信装置が受信信号をＡＣＫ信号と判定してしまう誤りを回避できるので、すなわち、再送を要求されたにもかかわらず、再送データではなく次データを送信してしまう、という誤動作を回避できるので、たとえば、無線通信路の状態が劣化した場合であっても、パケット受信側通信装置におけるパケットの欠落を防止できる。 Thus, in this embodiment, the ACK / NACK signal is determined according to the reliability of the demodulation result. As a result, when the packet receiving side communication apparatus transmits a NACK signal, an error that the packet transmitting side communication apparatus determines that the received signal is an ACK signal can be avoided, that is, even though retransmission is requested. Since the malfunction that the next data is transmitted instead of the retransmitted data can be avoided, for example, even when the state of the wireless communication path is deteriorated, it is possible to prevent the packet reception side communication device from being lost.

実施の形態２．
前述した実施の形態１では、外部より設定されたＡＣＫ／ＮＡＣＫ判定用しきい値と、ＨＡＲＱ−ＡＣＫ情報の軟判定値の合成結果と、を比較し、その結果に基づいてＡＣＫ／ＮＡＣＫ信号（ＡＣＫ信号かＮＡＣＫ信号か）を判定したが、実施の形態２では、ＨＡＲＱ−ＡＣＫ情報の硬判定値を利用してＡＣＫ／ＮＡＣＫ判定用しきい値を算出し、このしきい値に基づいてＡＣＫ／ＮＡＣＫ信号を判定する。 Embodiment 2. FIG.
In the first embodiment described above, the threshold value for ACK / NACK determination set from the outside is compared with the synthesized result of the soft decision value of the HARQ-ACK information, and an ACK / NACK signal ( In the second embodiment, an ACK / NACK determination threshold is calculated using a hard decision value of HARQ-ACK information, and ACK is determined based on this threshold. / NACK signal is determined.

図４は、本発明にかかるパケット伝送方法を実現するための実施の形態２のパケット送信側通信装置（基地局）の構成を示す図であり、特に、ＨＳ−ＤＰＣＣＨ上のＡＣＫ／ＮＡＣＫ信号を判定するための構成を示す図である。この通信装置は、実施の形態１と同様のＨＳ−ＤＰＣＣＨ信号の復調結果である軟判定値に加えて、さらに復調結果として硬判定値を出力する受信信号復調部１１と、当該硬判定値に基づいて、たとえば、通信状態の目安となるＡＣＫシンボル数を算出するＡＣＫシンボル数算出部１２と、当該ＡＣＫシンボル数に基づいてＡＣＫ／ＮＡＣＫ判定用しきい値を生成するＡＣＫ／ＮＡＣＫ判定しきい値算出部１３と、を備える。なお、先に説明した実施の形態１と同様の構成については、同一の符号を付してその説明を省略する。 FIG. 4 is a diagram showing a configuration of a packet transmission side communication apparatus (base station) according to the second embodiment for realizing the packet transmission method according to the present invention. In particular, FIG. 4 shows an ACK / NACK signal on the HS-DPCCH. It is a figure which shows the structure for determining. This communication apparatus includes a received signal demodulator 11 that outputs a hard decision value as a demodulation result in addition to a soft decision value that is a demodulation result of the HS-DPCCH signal similar to that in the first embodiment, and a hard decision value. Based on, for example, an ACK symbol number calculation unit 12 that calculates the number of ACK symbols that serves as an indication of a communication state, and an ACK / NACK determination threshold that generates an ACK / NACK determination threshold based on the number of ACK symbols And a calculation unit 13. In addition, about the structure similar to Embodiment 1 demonstrated previously, the same code | symbol is attached | subjected and the description is abbreviate | omitted.

ここで、上記実施の形態２の通信装置の動作について説明する。なお、ここでは、先に説明した実施の形態１と異なる動作についてのみ説明する。 Here, the operation of the communication apparatus according to the second embodiment will be described. Here, only operations different from those of the first embodiment described above will be described.

受信信号復調部１１では、ＨＳ−ＤＰＣＣＨ信号の復調結果として軟判定値をＡＣＫ／ＮＡＣＫ判定部２に対して出力し、さらに、復調結果として硬判定値をＡＣＫシンボル数算出部１２に対して出力する。ＡＣＫシンボル数算出部１２では、通信状態の推定処理として、たとえば、受け取った硬判定値からＨＡＲＱ−ＡＣＫ情報とＣＱＩ情報を分離し、ＨＡＲＱ−ＡＣＫ情報を示すシンボル毎の符号によりＡＣＫシンボル数を算出する。そして、ＡＣＫ／ＮＡＣＫ判定しきい値算出部１３では、たとえば、内部メモリに設定された、想定されるＡＣＫシンボル数毎に関連付けられたＡＣＫ／ＮＡＣＫ判定用しきい値に基づいて、上記で算出されたＡＣＫシンボル数に対応するＡＣＫ／ＮＡＣＫ判定用しきい値を検索する。 Reception signal demodulator 11 outputs a soft decision value to ACK / NACK determination unit 2 as the demodulation result of the HS-DPCCH signal, and further outputs a hard decision value to ACK symbol number calculation unit 12 as the demodulation result. To do. In the ACK symbol number calculation unit 12, for example, the HARQ-ACK information and the CQI information are separated from the received hard decision value, and the number of ACK symbols is calculated by the code for each symbol indicating the HARQ-ACK information as the communication state estimation process. To do. Then, the ACK / NACK determination threshold value calculation unit 13 calculates, for example, based on the threshold value for ACK / NACK determination set in the internal memory and associated with each assumed number of ACK symbols. A threshold for ACK / NACK determination corresponding to the number of received ACK symbols is searched.

なお、ＡＣＫシンボル数が多い場合は、ＨＡＲＱ−ＡＣＫ情報を示す全シンボルの軟判定値を合成した値が低い場合であっても「ＡＣＫ」と判定することができるように、ＡＣＫ／ＮＡＣＫ判定用しきい値を低い値（０に近い値）とする。また、ＡＣＫ判定しきい値算出部１３の内部メモリから検索可能なＡＣＫ／ＮＡＣＫ判定用しきい値は、外部からも設定可能とする。 When the number of ACK symbols is large, the ACK / NACK determination can be performed so that it can be determined as “ACK” even when the combined value of the soft decision values of all symbols indicating HARQ-ACK information is low. The threshold value is set to a low value (a value close to 0). The ACK / NACK determination threshold that can be searched from the internal memory of the ACK determination threshold calculation unit 13 can be set from the outside.

このように、本実施の形態においては、外部から設定されたしきい値に基づいてＡＣＫ／ＮＡＣＫ信号を判定するのではなく、ＨＡＲＱ−ＡＣＫ情報を示す全シンボルの符号によりＡＣＫシンボル数を求め、当該ＡＣＫシンボル数に応じたＡＣＫ／ＮＡＣＫ判定用しきい値を検索し、当該ＡＣＫ／ＮＡＣＫ判定用しきい値に基づいてＡＣＫ／ＮＡＣＫ信号を判定することとした。これにより、ノイズの少ない状態で受信信号の振幅が小さい場合であっても、精度よくＡＣＫ／ＮＡＣＫ信号を判定できる。 As described above, in the present embodiment, instead of determining an ACK / NACK signal based on a threshold value set from the outside, the number of ACK symbols is obtained by the code of all symbols indicating HARQ-ACK information, An ACK / NACK determination threshold value corresponding to the number of ACK symbols is searched, and an ACK / NACK signal is determined based on the ACK / NACK determination threshold value. Thereby, even when the amplitude of the received signal is small in a state where there is little noise, the ACK / NACK signal can be accurately determined.

実施の形態３．
前述した実施の形態２では、ＡＣＫ／ＮＡＣＫ判定しきい値算出部１３の内部メモリに設定されているＡＣＫ／ＮＡＣＫ判定用しきい値を使用してＡＣＫ／ＮＡＣＫ信号（ＡＣＫ信号かＮＡＣＫ信号か）を判定していたが、実施の形態３では、ＳＮ比に基づいて内部でＡＣＫ／ＮＡＣＫ判定用しきい値を算出する。 Embodiment 3 FIG.
In Embodiment 2 described above, an ACK / NACK signal (whether an ACK signal or a NACK signal) is used by using the threshold for ACK / NACK determination set in the internal memory of the ACK / NACK determination threshold calculation unit 13. In the third embodiment, an ACK / NACK determination threshold is calculated internally based on the SN ratio.

図５は、本発明にかかるパケット伝送方法を実現するための実施の形態３のパケット送信側通信装置（基地局）の構成を示す図であり、特に、ＨＳ−ＤＰＣＣＨ上のＡＣＫ／ＮＡＣＫ信号を判定するための構成を示す図である。この通信装置は、受信信号に多重化されたＨＳ−ＤＰＣＣＨ信号を復調するＨＳ−ＤＰＣＣＨ復調部２１と、受信信号に多重化されたＤＰＣＣＨ信号を復調するＤＰＣＣＨ復調部２２と、ＤＰＣＣＨ復調部２２から出力されるＳＩＲ値に基づいてＡＣＫ／ＮＡＣＫ判定用しきい値を算出するＡＣＫ／ＮＡＣＫ判定しきい値算出部２３と、を備える。なお、先に説明した実施の形態１および２と同様の構成については、同一の符号を付してその説明を省略する。 FIG. 5 is a diagram showing a configuration of the packet transmission side communication apparatus (base station) of the third embodiment for realizing the packet transmission method according to the present invention. In particular, FIG. 5 shows an ACK / NACK signal on the HS-DPCCH. It is a figure which shows the structure for determining. The communication apparatus includes an HS-DPCCH demodulator 21 that demodulates an HS-DPCCH signal multiplexed on a received signal, a DPCCH demodulator 22 that demodulates a DPCCH signal multiplexed on a received signal, and a DPCCH demodulator 22. An ACK / NACK determination threshold value calculation unit for calculating an ACK / NACK determination threshold value based on the output SIR value. In addition, about the structure similar to Embodiment 1 and 2 demonstrated previously, the same code | symbol is attached | subjected and the description is abbreviate | omitted.

ここで、上記実施の形態３の通信装置の動作について説明する。なお、ここでは、先に説明した実施の形態１および２と異なる動作についてのみ説明する。 Here, the operation of the communication apparatus according to the third embodiment will be described. Here, only operations different from those of the first and second embodiments described above will be described.

ＨＳ−ＤＰＣＣＨ復調部２１では、受信信号を復調し、受信信号に多重化されているＨＳ−ＤＰＣＣＨ信号の復調結果として軟判定値を生成する。また、ＤＰＣＣＨ復調部２２では、ＡＣＫ／ＮＡＣＫ判定しきい値の生成に雑音等の影響を反映するために、復調後のＤＰＣＣＨ信号のＳＩＲ値を算出する。ＡＣＫ／ＮＡＣＫ判定しきい値算出部２３では、ＳＩＲ値が良好な（高い）値の場合、しきい値を低い値（０に近い値）、ＳＩＲが劣悪な（低い）値の場合、しきい値を高い値（０から遠い値）とする。 The HS-DPCCH demodulation unit 21 demodulates the received signal and generates a soft decision value as a demodulation result of the HS-DPCCH signal multiplexed with the received signal. Further, the DPCCH demodulation unit 22 calculates the SIR value of the demodulated DPCCH signal in order to reflect the influence of noise or the like on the generation of the ACK / NACK determination threshold value. In the ACK / NACK determination threshold value calculation unit 23, when the SIR value is a good (high) value, the threshold value is a low value (a value close to 0), and when the SIR value is a bad (low) value, the threshold is set. The value is set to a high value (a value far from 0).

なお、ここで使用するＳＩＲ値はＳＮ比を示す値であり、ＤＰＣＣＨ信号のＰｈＣＨＢＥＲ，サーチ時の相関電力値、と言ったＳＮ比を推定できる他の値を使用してもよい。 The SIR value used here is a value indicating the SN ratio, and other values capable of estimating the SN ratio such as the PhCH BER of the DPCCH signal and the correlation power value at the time of search may be used.

このように、本実施の形態においては、外部から設定されたしきい値に基づいてＡＣＫ／ＮＡＣＫ信号を判定するのではなく、ＳＮ比の状態によりＡＣＫ／ＮＡＣＫ判定用しきい値を変更し、当該ＡＣＫ／ＮＡＣＫ判定用しきい値に基づいてＡＣＫ／ＮＡＣＫ信号を判定することとした。これにより、受信信号の振幅が小さい場合であっても、精度よくＡＣＫ／ＮＡＣＫ信号を判定できる。 Thus, in this embodiment, instead of determining an ACK / NACK signal based on an externally set threshold, the ACK / NACK determination threshold is changed according to the state of the SN ratio, The ACK / NACK signal is determined based on the ACK / NACK determination threshold. Thereby, even when the amplitude of the received signal is small, the ACK / NACK signal can be accurately determined.

実施の形態４．
図６は、本発明にかかるパケット伝送方法を実現するための無線通信システム（基地局，端末局）の構成を示す図である。この無線通信システムを構成する基地局は、上り受信信号からＨＳ−ＤＰＣＣＨ信号を復調するＨＳ−ＤＰＣＣＨ復調部３１と、復調したＨＳ−ＤＰＣＣＨ信号からＨＡＲＱ−ＡＣＫ信号を分離し、ＡＣＫ／ＮＡＣＫ信号を判定するＡＣＫ／ＮＡＣＫ判定部３２と、ＡＣＫ／ＮＡＣＫ判定部の判定結果に基づいて送信データ管理，再送管理，再送時のデータ分割等、送信全体を制御する送信制御部３３と、送信データを符号化および変調し、その結果であるＨＳ−ＰＤＳＣＨ信号を出力するＨＳ−ＰＤＳＣＨ送信部３４と、制御情報を符号化および変調し、その結果であるＨＳ−ＳＣＣＨ信号を出力するＨＳ−ＳＣＣＨ送信部３５と、を備える。なお、上記基地局における復調処理および判定処理は、先に説明した実施の形態１〜３の構成を用いて実現することとしてもよい。 Embodiment 4 FIG.
FIG. 6 is a diagram showing a configuration of a wireless communication system (base station, terminal station) for realizing the packet transmission method according to the present invention. The base station constituting this radio communication system separates an HS-DPCCH demodulator 31 that demodulates an HS-DPCCH signal from an uplink received signal, and separates an HARQ-ACK signal from the demodulated HS-DPCCH signal, and transmits an ACK / NACK signal. An ACK / NACK determination unit 32 for determining, a transmission control unit 33 for controlling the entire transmission such as transmission data management, retransmission management, and data division at the time of retransmission based on the determination result of the ACK / NACK determination unit, and encoding the transmission data An HS-PDSCH transmitter 34 that outputs and outputs the HS-PDSCH signal as a result, and an HS-SCCH transmitter 35 that encodes and modulates the control information and outputs the HS-SCCH signal as a result thereof. And comprising. Note that the demodulation processing and determination processing in the base station may be realized using the configurations of the first to third embodiments described above.

また、端末局は、受信信号からＨＳ−ＰＤＳＣＨ信号を復調するＨＳ−ＰＤＳＣＨ復調部４１と、受信信号からＨＳ−ＳＣＣＨ信号を復調するＨＳ−ＳＣＣＨ復調部４２と、ＨＳ−ＰＤＳＣＨ復調部４１およびＨＳ−ＳＣＣＨ復調部４２の出力を復号し、制御情報とデータの分離，データの誤り検出等、受信全体を制御する受信制御部４３と、受信制御部４３による復号結果に基づいてＨＡＲＱ−ＡＣＫ信号を生成するＡＣＫ／ＮＡＣＫ選択部４４と、決定されたＨＡＲＱ−ＡＣＫ信号と受信制御部４３から通知される受信信号の制御情報に基づいて、ＨＡＲＱ−ＡＣＫ信号を含む応答信号に対して変調および送信電力制御を行い、その結果であるＨＳ−ＤＰＣＣＨ信号を出力するＨＳ−ＤＰＣＣＨ送信制御部４５と、を備える。 Also, the terminal station demodulates the HS-PDSCH signal from the received signal, the HS-PDSCH demodulator 41, the HS-SCCH demodulator 42 that demodulates the HS-SCCH signal from the received signal, the HS-PDSCH demodulator 41 and the HS -The output of the SCCH demodulation unit 42 is decoded, the reception control unit 43 that controls the entire reception such as separation of control information and data, data error detection, and the HARQ-ACK signal based on the decoding result by the reception control unit 43 Based on the ACK / NACK selection unit 44 to be generated, the determined HARQ-ACK signal and the control information of the received signal notified from the reception control unit 43, the response signal including the HARQ-ACK signal is modulated and transmitted power An HS-DPCCH transmission control unit 45 that performs control and outputs an HS-DPCCH signal as a result.

ここで、上記基地局および端末局の動作を図６および図７を用いて説明する。図７は、基地局と端末局との間でやりとりされる信号を示す図である。 Here, the operations of the base station and the terminal station will be described with reference to FIGS. FIG. 7 is a diagram illustrating signals exchanged between the base station and the terminal station.

まず、基地局では、ＨＳ−ＤＰＣＣＨ復調部３１が、ＨＳ−ＤＰＣＣＨ信号を復調し、その復調結果からＨＡＲＱ−ＡＣＫ信号を分離し、ＡＣＫ／ＮＡＣＫ判定部３２が、ＡＣＫ／ＮＡＣＫ信号を判定し、その判定結果を送信制御部３３へ通知する。たとえば、ＨＡＲＱ−ＡＣＫ信号が「ＡＣＫ」と判定された場合、送信制御部３３では、次に送るべき送信データを用意する。そして、ＨＳ−ＰＤＳＣＨ送信部３４が、当該送信データを符号化および変調し、その結果であるＨＳ−ＰＤＳＣＨ信号を送信する。また、ＨＳ−ＳＣＣＨ送信部３５が、上記判定結果である「ＡＣＫ」を符号化および変調し、その結果であるＨＳ−ＳＣＣＨ信号を送信する。 First, in the base station, the HS-DPCCH demodulation unit 31 demodulates the HS-DPCCH signal, separates the HARQ-ACK signal from the demodulation result, and the ACK / NACK determination unit 32 determines the ACK / NACK signal, The determination result is notified to the transmission control unit 33. For example, when the HARQ-ACK signal is determined to be “ACK”, the transmission control unit 33 prepares transmission data to be transmitted next. Then, the HS-PDSCH transmission unit 34 encodes and modulates the transmission data, and transmits the HS-PDSCH signal as a result. Further, the HS-SCCH transmission unit 35 encodes and modulates “ACK” that is the determination result, and transmits the HS-SCCH signal that is the result.

一方、上記ＨＡＲＱ−ＡＣＫ信号が「ＮＡＣＫ」と判定された場合、送信制御部３３では、次に送るべき初送データ（再送データ）を用意する。そして、ＨＳ−ＰＤＳＣＨ送信部３４が、当該初送データを符号化および変調し、その結果であるＨＳ−ＰＤＳＣＨ信号を再送する。また、ＨＳ−ＳＣＣＨ送信部３５が、上記判定結果である「ＮＡＣＫ」を符号化および変調し、その結果であるＨＳ−ＳＣＣＨ信号を送信する。 On the other hand, when the HARQ-ACK signal is determined to be “NACK”, the transmission control unit 33 prepares initial transmission data (retransmission data) to be transmitted next. Then, the HS-PDSCH transmission unit 34 encodes and modulates the initial transmission data, and retransmits the HS-PDSCH signal as a result. Further, the HS-SCCH transmission unit 35 encodes and modulates “NACK” that is the determination result, and transmits the HS-SCCH signal that is the result.

つぎに、端末局では、ＨＳ−ＳＣＣＨ復調部４２が、基地局から送られてくるＨＳ−ＳＣＣＨ信号を復調し、その復調結果に基づいて、ＨＳ−ＰＤＳＣＨ復調部４１が、ＨＳ−ＰＤＳＣＨ信号を復調する。受信制御部４３では、復調後のデータが正常に受信できているかどうかを判定する。そして、ＡＣＫ／ＮＡＣＫ選択部４４では、受信制御部４３の判定結果に基づいて基地局へＡＣＫ／ＮＡＣＫ信号のどちらを送信するかを選択する。その後、ＨＳ−ＤＰＣＣＨ送信制御部４５では、選択されたＡＣＫ／ＮＡＣＫ信号を符号化および変調し、その結果であるＨＳ−ＤＰＣＣＨ信号を基地局へ送信する。このとき、ＨＳ−ＤＰＣＣＨ送信制御部４５では、送信電力制御を行う。具体的には、図７に示すＨＳ−ＳＣＣＨ信号により返信されたＡＣＫ／ＮＡＣＫ返信信号１１２と、過去にＨＳ−ＤＰＣＣＨ送信制御部４５がＨＳ−ＤＰＣＣＨ信号として送信したＨＡＲＱ−ＡＣＫ信号１１１と、を比較し、それらが一致しない場合は、以降のＨＳ−ＤＰＣＣＨ信号の送信電力を一定レベル増加させる。 Next, in the terminal station, the HS-SCCH demodulation unit 42 demodulates the HS-SCCH signal transmitted from the base station, and the HS-PDSCH demodulation unit 41 converts the HS-PDSCH signal based on the demodulation result. Demodulate. The reception control unit 43 determines whether the demodulated data can be normally received. Then, the ACK / NACK selection unit 44 selects which of the ACK / NACK signals is transmitted to the base station based on the determination result of the reception control unit 43. Thereafter, the HS-DPCCH transmission control unit 45 encodes and modulates the selected ACK / NACK signal, and transmits the resulting HS-DPCCH signal to the base station. At this time, the HS-DPCCH transmission control unit 45 performs transmission power control. Specifically, the ACK / NACK reply signal 112 returned by the HS-SCCH signal shown in FIG. 7 and the HARQ-ACK signal 111 transmitted by the HS-DPCCH transmission control unit 45 as the HS-DPCCH signal in the past, If they do not match, the transmission power of subsequent HS-DPCCH signals is increased by a certain level.

図８は、ＨＳ−ＤＰＣＣＨ送信制御部４５の詳細構成を示す図であり、ＨＳ−ＤＰＣＣＨ送信部５１と、ＨＡＲＱ−ＡＣＫ記憶部５２と、ＡＣＫ／ＮＡＣＫ比較部５３と、ＨＳ−ＤＰＣＣＨ送信電力制御部５４と、を備える。 FIG. 8 is a diagram showing a detailed configuration of the HS-DPCCH transmission control unit 45, which includes an HS-DPCCH transmission unit 51, a HARQ-ACK storage unit 52, an ACK / NACK comparison unit 53, and HS-DPCCH transmission power control. Unit 54.

ＡＣＫ／ＮＡＣＫ比較部５３では、受信制御部４３から通知されるＡＣＫ／ＮＡＣＫ返信信号１１２と、ＨＡＲＱ−ＡＣＫ記憶部５２に記憶されているＡＣＫ／ＮＡＣＫ返信信号１１２に対応する過去のＨＡＲＱ−ＡＣＫ信号１１１と、を比較し、その比較結果をＨＳ−ＤＰＣＣＨ送信電力制御部５４に通知する。そして、ＨＳ−ＤＰＣＣＨ送信電力制御部５４では、送信すべきＨＳ−ＤＰＣＣＨ信号に対して送信電力制御を行う。なお、ＨＡＲＱ−ＡＣＫ記憶部５２では、ＡＣＫ／ＮＡＣＫ選択部４４にて生成されたＨＡＲＱ−ＡＣＫ信号を保存し、ＡＣＫ／ＮＡＣＫ比較部５３からの要求により出力する。 In the ACK / NACK comparison unit 53, a past HARQ-ACK signal corresponding to the ACK / NACK reply signal 112 notified from the reception control unit 43 and the ACK / NACK reply signal 112 stored in the HARQ-ACK storage unit 52. 111 and the HS-DPCCH transmission power control unit 54 is notified of the comparison result. Then, the HS-DPCCH transmission power control unit 54 performs transmission power control on the HS-DPCCH signal to be transmitted. The HARQ-ACK storage unit 52 stores the HARQ-ACK signal generated by the ACK / NACK selection unit 44 and outputs it according to a request from the ACK / NACK comparison unit 53.

図９は、ＨＳ−ＤＰＣＣＨ送信電力制御部５４の処理を示すフローチャートである。まず、ＡＣＫ／ＮＡＣＫ選択部４４にて生成されたＨＡＲＱ−ＡＣＫ信号に基づいて（ステップＳ１１）ＨＳ−ＤＰＣＣＨ送信電力増加量：ΔＨＳ−ＤＰＣＣＨを算出する（ステップＳ１２、Ｓ１３）。つぎに、ＡＣＫ／ＮＡＣＫ比較部５３による比較結果が不一致の場合（ステップＳ１４，不一致）、ＨＳ−ＤＰＣＣＨ送信電力加算係数：ＨＳ−ＤＰＣＣＨ＿ｃｏｅｆを、ＨＳ−ＤＰＣＣＨ送信電力補正値：Δｃｏｒｒｅｃｔに加算する（ステップＳ１５）。また、ＡＣＫ／ＮＡＣＫ比較部５３による比較結果が一致する場合には（ステップＳ１４，一致）、ＨＳ−ＤＰＣＣＨ送信電力補正値：Δｃｏｒｒｅｃｔに対する加算を行わない。ただし、一定期間にわたって比較結果が一致した場合には、段階的に、ＨＳ−ＤＰＣＣＨ送信電力補正値：Δｃｏｒｒｅｃｔの値を所定量だけ小さくする。これにより、他のチャネルに対する雑音の影響を低減できる。 FIG. 9 is a flowchart showing processing of the HS-DPCCH transmission power control unit 54. First, based on the HARQ-ACK signal generated by the ACK / NACK selector 44 (step S11), an HS-DPCCH transmission power increase amount: ΔHS-DPCCH is calculated (steps S12 and S13). Next, when the comparison result by the ACK / NACK comparison unit 53 does not match (step S14, mismatch), the HS-DPCCH transmission power addition coefficient: HS-DPCCH_coef is added to the HS-DPCCH transmission power correction value: Δcorrect (step) S15). If the comparison results by the ACK / NACK comparison unit 53 match (step S14, match), the HS-DPCCH transmission power correction value: Δcorrect is not added. However, if the comparison results match over a certain period, the value of HS-DPCCH transmission power correction value: Δcorrect is decreased by a predetermined amount step by step. This can reduce the influence of noise on other channels.

つぎに、上記で算出したＨＳ−ＤＰＣＣＨ送信電力補正値：Δｃｏｒｒｅｃｔを上記ΔＨＳ−ＤＰＣＣＨに加算し、ＨＳ−ＤＰＣＣＨ信号の送信電力を算出する（ステップＳ１６）。最後に、ＨＳ−ＤＰＣＣＨ送信部５１では、ＨＳ−ＤＰＣＣＨ送信電力制御部５４で算出された送信電力でＨＳ−ＤＰＣＣＨ信号を送信する。 Next, the HS-DPCCH transmission power correction value: Δcorrect calculated above is added to the ΔHS-DPCCH to calculate the transmission power of the HS-DPCCH signal (step S16). Finally, the HS-DPCCH transmission unit 51 transmits the HS-DPCCH signal with the transmission power calculated by the HS-DPCCH transmission power control unit 54.

このように、本実施の形態においては、ＨＳ−ＳＣＣＨ信号により返信されたＡＣＫ／ＮＡＣＫ返信信号によって、端末局が送信したＨＡＲＱ−ＡＣＫ信号が正しく基地局に伝送されているかどうかを判定し、正しく伝送されていない場合には、ＨＡＲＱ−ＡＣＫ信号を含むＨＳ−ＤＰＣＣＨ信号の送信電力を増加させることとした。これにより、以降のＨＡＲＱ−ＡＣＫ信号を基地局にて正しく判定できるので、再送データの欠落を防ぐことができる。 As described above, in this embodiment, it is determined whether the HARQ-ACK signal transmitted from the terminal station is correctly transmitted to the base station based on the ACK / NACK reply signal returned by the HS-SCCH signal, and When not transmitted, the transmission power of the HS-DPCCH signal including the HARQ-ACK signal is increased. As a result, subsequent HARQ-ACK signals can be correctly determined by the base station, so that retransmission data can be prevented from being lost.

以上のように、本発明にかかるパケット伝送方法は、誤り制御技術としてＡＲＱ（Automatic Repeat Request）を採用する無線通信システムに有用であり、特に、高速無線通信を実現するための無線通信システムおよび通信装置に適している。 As described above, the packet transmission method according to the present invention is useful for a radio communication system that employs ARQ (Automatic Repeat Request) as an error control technique, and in particular, a radio communication system and communication for realizing high-speed radio communication. Suitable for the device.

本発明にかかるパケット伝送方法を実現するための実施の形態１のパケット送信側通信装置（基地局）の構成を示す図である。It is a figure which shows the structure of the packet transmission side communication apparatus (base station) of Embodiment 1 for implement | achieving the packet transmission method concerning this invention. ＡＣＫ／ＮＡＣＫ判定部の処理を示すフローチャートである。It is a flowchart which shows the process of an ACK / NACK determination part. ＡＣＫ／ＮＡＣＫ判定処理の一例を示す図である。It is a figure which shows an example of an ACK / NACK determination process. 本発明にかかるパケット伝送方法を実現するための実施の形態２のパケット送信側通信装置（基地局）の構成を示す図である。It is a figure which shows the structure of the packet transmission side communication apparatus (base station) of Embodiment 2 for implement | achieving the packet transmission method concerning this invention. 本発明にかかるパケット伝送方法を実現するための実施の形態３のパケット送信側通信装置（基地局）の構成を示す図である。It is a figure which shows the structure of the packet transmission side communication apparatus (base station) of Embodiment 3 for implement | achieving the packet transmission method concerning this invention. 本発明にかかるパケット伝送方法を実現するための無線通信システム（基地局，端末局）の構成を示す図である。It is a figure which shows the structure of the radio | wireless communications system (base station, terminal station) for implement | achieving the packet transmission method concerning this invention. 基地局と端末局との間でやりとりされる信号を示す図である。It is a figure which shows the signal exchanged between a base station and a terminal station. ＨＳ−ＤＰＣＣＨ送信制御部の詳細構成を示す図である。It is a figure which shows the detailed structure of an HS-DPCCH transmission control part. ＨＳ−ＤＰＣＣＨ送信電力制御部の処理を示すフローチャートである。It is a flowchart which shows the process of an HS-DPCCH transmission power control part.

Explanation of symbols

１受信信号復調部
２ＡＣＫ／ＮＡＣＫ判定部
１１受信信号復調部
１２ＡＣＫシンボル数算出部
１３ＡＣＫ／ＮＡＣＫ判定しきい値算出部
２１ＨＳ−ＤＰＣＣＨ復調部
２２ＤＰＣＣＨ復調部
２３ＡＣＫ／ＮＡＣＫ判定しきい値算出部
３１ＨＳ−ＤＰＣＣＨ復調部
３２ＡＣＫ／ＮＡＣＫ判定部
３３送信制御部
３４ＨＳ−ＰＤＳＣＨ送信部
３５ＨＳ−ＳＣＣＨ送信部
４１ＨＳ−ＰＤＳＣＨ復調部
４２ＨＳ−ＳＣＣＨ復調部
４３受信制御部
４４ＡＣＫ／ＮＡＣＫ選択部
４５ＨＳ−ＤＰＣＣＨ送信制御部
５１ＨＳ−ＤＰＣＣＨ送信部
５２ＨＡＲＱ−ＡＣＫ記憶部
５３ＡＣＫ／ＮＡＣＫ比較部
５４ＨＳ−ＤＰＣＣＨ送信電力制御部 DESCRIPTION OF SYMBOLS 1 Reception signal demodulation part 2 ACK / NACK determination part 11 Reception signal demodulation part 12 ACK symbol number calculation part 13 ACK / NACK determination threshold value calculation part 21 HS-DPCCH demodulation part 22 DPCCH demodulation part 23 ACK / NACK determination threshold value Calculation unit 31 HS-DPCCH demodulation unit 32 ACK / NACK determination unit 33 Transmission control unit 34 HS-PDSCH transmission unit 35 HS-SCCH transmission unit 41 HS-PDSCH demodulation unit 42 HS-SCCH demodulation unit 43 Reception control unit 44 ACK / NACK Selection unit 45 HS-DPCCH transmission control unit 51 HS-DPCCH transmission unit 52 HARQ-ACK storage unit 53 ACK / NACK comparison unit 54 HS-DPCCH transmission power control unit

Claims

In a packet transmission method in the case of employing automatic repeat request (ARQ) as an error control technique,
The communication device on the packet transmission side
A soft decision value combining step of extracting response information indicating "ACK" or "NACK" from the soft decision value obtained as a demodulation result of the received signal, and combining the soft decision values of all symbols indicating the response information;
The composite result of the soft decision value is compared with a predetermined threshold value for determining the response information. When the composite result of the soft decision value is equal to or less than (or less than) the threshold value, the response A determination step of determining information as “NACK” and determining that the response information is “ACK” when a composite result of the soft decision value is greater than (or greater than) the threshold;
A packet transmission method comprising:

The packet transmission method according to claim 1, wherein the predetermined threshold is set from the outside.

The communication state is estimated by determining the response information using a symbol-by-symbol code of the received signal, and if the communication state is good, even if the synthesis result of the soft decision value is low The packet transmission method according to claim 1, wherein the predetermined threshold value is determined so that it can be determined as “ACK”.

The predetermined threshold is calculated so that the influence of noise is calculated based on the demodulation result of the received signal, and the threshold when the influence of noise is large is higher than the threshold when the influence of noise is small. The packet transmission method according to claim 1, wherein the packet transmission method is determined.

5. The packet transmission method according to claim 4, wherein a predetermined threshold value reflecting the influence of the noise is determined based on an SIR value of a control channel.

The packet transmission method according to claim 4, wherein a predetermined threshold value reflecting the influence of the noise is determined based on a PhCH-BER of a control channel.

5. The packet transmission method according to claim 4, wherein a predetermined threshold value reflecting the influence of the noise is determined based on a correlation power of a path search of a control channel.

The communication device on the packet receiving side
The “ACK / NACK” information transmitted together with the transmission data from the communication device on the packet transmission side is compared with the response information returned in response to the previous packet transmission. The packet transmission method according to claim 1, wherein the transmission power of information is increased by a certain level.

9. The packet transmission method according to claim 8, wherein when the comparison result matches over a certain period, the transmission power of the response information is reduced by a predetermined amount.

In a communication device on the packet transmission side that employs automatic repeat request (ARQ) as error control technology,
Response information indicating “ACK” or “NACK” is extracted from the soft decision value obtained as a demodulation result of the received signal, and the soft decision values of all symbols indicating the response information are synthesized, and further, the soft decision values are synthesized. A result is compared with a predetermined threshold value for determining the response information, and when the result of combining the soft decision values is less than (or less than) the threshold value, the response information is “NACK”. ACK / NACK determination means for determining that the response information is “ACK” when the combined result of the soft decision values is greater than (or greater than) the threshold value,
A communication apparatus comprising:

The communication apparatus according to claim 10, wherein the ACK / NACK determination unit can set the predetermined threshold value from the outside.

The ACK / NACK determination means estimates a communication state by determining the response information using a symbol-by-symbol code of a received signal, and if the communication state is good, combines the soft decision value The communication apparatus according to claim 10, wherein the predetermined threshold value is determined so that “ACK” can be determined even when the result is low.

The ACK / NACK determination means calculates the influence of noise based on the demodulation result of the received signal so that the threshold when the influence of noise is large is higher than the threshold when the influence of noise is small. The communication apparatus according to claim 10, wherein the predetermined threshold is determined.

The communication apparatus according to claim 13, wherein the ACK / NACK determination unit determines a predetermined threshold value reflecting the influence of the noise based on a SIR value of a control channel.

The communication apparatus according to claim 13, wherein the ACK / NACK determination unit determines a predetermined threshold value reflecting the influence of the noise based on a PhCH-BER of a control channel.

14. The communication apparatus according to claim 13, wherein the ACK / NACK determination unit determines a predetermined threshold value reflecting the influence of the noise based on a correlation power of a path search for a control channel.

In a communication device on the packet receiving side that employs automatic repeat request (ARQ) as error control technology,
When "ACK / NACK" information transmitted together with transmission data from the communication device on the packet transmission side is compared with response information returned in response to the previous packet transmission, Transmission control means for increasing the transmission power of the response information by a certain level;
A communication apparatus comprising:

The communication apparatus according to claim 17, wherein the transmission control unit lowers the transmission power of the response information by a predetermined amount when the comparison results match over a certain period.