JP2010232706A - Retransmission parameter automatic calculation algorithm and system thereof - Google Patents

Retransmission parameter automatic calculation algorithm and system thereof Download PDF

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JP2010232706A
JP2010232706A JP2007195253A JP2007195253A JP2010232706A JP 2010232706 A JP2010232706 A JP 2010232706A JP 2007195253 A JP2007195253 A JP 2007195253A JP 2007195253 A JP2007195253 A JP 2007195253A JP 2010232706 A JP2010232706 A JP 2010232706A
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information
transmission path
reception
reception buffer
packet
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Ken Sasada
健 笹田
Yoshiki Watanabe
佳樹 渡邉
Yosuke Kuniyasu
洋亮 國安
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MEDIA GLOBAL LINKS KK
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Priority to PCT/JP2008/063452 priority patent/WO2009014222A1/en
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L1/00—Arrangements for detecting or preventing errors in the information received
    • H04L1/12—Arrangements for detecting or preventing errors in the information received by using return channel
    • H04L1/16—Arrangements for detecting or preventing errors in the information received by using return channel in which the return channel carries supervisory signals, e.g. repetition request signals
    • H04L1/18—Automatic repetition systems, e.g. Van Duuren systems
    • H04L1/1825—Adaptation of specific ARQ protocol parameters according to transmission conditions
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L1/00—Arrangements for detecting or preventing errors in the information received
    • H04L1/12—Arrangements for detecting or preventing errors in the information received by using return channel
    • H04L1/16—Arrangements for detecting or preventing errors in the information received by using return channel in which the return channel carries supervisory signals, e.g. repetition request signals
    • H04L1/18—Automatic repetition systems, e.g. Van Duuren systems
    • H04L1/1829—Arrangements specially adapted for the receiver end
    • H04L1/1835—Buffer management
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L47/00—Traffic control in data switching networks
    • H04L47/10—Flow control; Congestion control
    • H04L47/11—Identifying congestion
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L47/00—Traffic control in data switching networks
    • H04L47/10—Flow control; Congestion control
    • H04L47/28—Flow control; Congestion control in relation to timing considerations
    • H04L47/283—Flow control; Congestion control in relation to timing considerations in response to processing delays, e.g. caused by jitter or round trip time [RTT]
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L49/00—Packet switching elements
    • H04L49/90—Buffering arrangements

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  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Data Exchanges In Wide-Area Networks (AREA)
  • Communication Control (AREA)
  • Detection And Prevention Of Errors In Transmission (AREA)

Abstract

<P>PROBLEM TO BE SOLVED: To adjust a reception buffer amount to a suitable one for a transmission path. <P>SOLUTION: A system includes a transmission device which transmits packets in real time, buffers packets to be transmitted, and retransmits buffered packets upon reception of a packet retransmission request, and a reception device which receives a packet from the transmission device and outputs it to another device. The reception device obtains transmission path characteristic information as information indicating the characteristics of the transmission path between a reception buffer unit which buffers received packets and the transmission device, and variably adjusts a buffer readout threshold value in the reception buffer unit according to the obtained transmission path characteristic information. More specifically, the reception buffer amount is calculated according to one of or a combination of packet loss frequency information on reception packets, retransmission-enabled band information, reception buffer capacity information, and round trip delay time information. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

本発明は、パケットを受信する受信装置を有するシステムに関するものであり、さらに詳細には、送信装置から送信又は再送されるパケットを受信する際の受信バッファ量を調整する発明に関する。   The present invention relates to a system having a receiving device for receiving a packet, and more particularly to an invention for adjusting a reception buffer amount when receiving a packet to be transmitted or retransmitted from a transmitting device.

従来、リアルタイム性を有するパケット再送制御に関する発明が開示されている。たとえば特許文献１や２に開示されているように、受信装置にてパケットのエラーを検出した場合には、エラーパケットの再送要求を送信装置に対して出力し、これを受けた送信装置にて、そのエラーパケットの再送処理が行われている。   Conventionally, inventions relating to packet retransmission control having real-time characteristics have been disclosed. For example, as disclosed in Patent Documents 1 and 2, when a packet error is detected by the receiving device, a request for retransmission of the error packet is output to the transmitting device, and the receiving device receives the error packet retransmission request. The retransmission process of the error packet is performed.

ここで、リアルタイム性を有するパケットを受信する場合には、受信装置の受信バッファ量をどの程度のバッファ量にするかが重要となる。すなわち受信バッファ量は、多すぎると遅延が長くなり、少なすぎるとエラーが発生した場合に映像が乱れたり画質が劣化したりする。そこで、受信バッファの設定を最適に調整する必要がある。従来は、その設定に際して明確な方法がなく、最初にネットワークを構築する際に、パケットの再送時間など測定して受信バッファの設定を行っていた。
特開２００６−２３７９６８号公報 特開２００３−１６９０４０号公報 Here, when a packet having real-time characteristics is received, it is important to determine how much the reception buffer amount of the reception apparatus is set to. That is, if the amount of the reception buffer is too large, the delay becomes long, and if it is too small, the video is disturbed or the image quality is deteriorated when an error occurs. Therefore, it is necessary to optimally adjust the setting of the reception buffer. Conventionally, there is no clear method for the setting, and when the network is first constructed, the reception buffer is set by measuring the retransmission time of the packet.
JP 2006-237968 A JP 2003-169040 A

しかしながら、従来の受信バッファ量の調整方法では、実際に運用を行った場合には、当初の受信バッファの設定では不適切な設定になってしまう場合が発生していた。たとえば、朝や夜になった場合などの時間的な変化や、伝送路へのノイズ等の影響により、運用を行っている最中であっても受信バッファ量の最適な設定値は刻一刻と変化しているものであるが、従来は依然として技術者の勘などに頼った調整が行われていた。   However, in the conventional method for adjusting the reception buffer amount, when the operation is actually performed, the initial setting of the reception buffer may cause an inappropriate setting. For example, the optimum setting value for the receive buffer amount is always in progress even during operation due to temporal changes such as when it is morning or night, and noise on the transmission path. Although it has changed, in the past, adjustments still depended on the intuition of engineers.

そこで、本発明はかかる課題に鑑みてなされたものであり、再送パケットを含むパケットを受信する受信バッファの読出閾値を最適に調整することで、受信装置の受信バッファ量を伝送路に適した受信バッファ量に調整することを目的とする。   Therefore, the present invention has been made in view of such a problem, and by optimally adjusting the read threshold value of a reception buffer that receives a packet including a retransmission packet, the reception buffer amount of the reception device is suitable for a transmission path. The purpose is to adjust the buffer amount.

リアルタイムでパケットを送信するとともに送信するパケットをバッファし、パケット再送要求の受信によってバッファしたパケットの再送を行う送信装置と、送信装置からのパケットを受信して他の装置に出力するための受信装置と、を有するシステムであって、送信装置から送信されるパケットを受信するパケット受信部と、受信したパケットをバッファする受信バッファ部と、送信装置との間の伝送路の特性を示す情報である伝送路特性情報を取得する伝送路特性情報取得部と、取得した伝送路特性情報に基づいて、受信バッファ部におけるバッファ読出閾値を可変調整可能な受信バッファ調整部と、を有する受信装置を提供する。伝送路特性情報は、受信パケットのパケットロス頻度情報、再送可能帯域情報、受信バッファの容量情報、往復遅延時間情報のいずれか又はこれら全部の情報の組み合わせに基づいて算出して生成される。   Transmitting apparatus that transmits packets in real time, buffers packets to be transmitted, and retransmits the buffered packets upon reception of a packet retransmission request, and receiving apparatus for receiving packets from the transmitting apparatus and outputting them to other apparatuses And a packet receiving unit that receives a packet transmitted from the transmission device, a reception buffer unit that buffers the received packet, and information indicating characteristics of a transmission path between the transmission device Provided is a receiving device having a transmission path characteristic information acquisition section that acquires transmission path characteristic information, and a reception buffer adjustment section that can variably adjust a buffer read threshold in the reception buffer section based on the acquired transmission path characteristic information. . The transmission path characteristic information is calculated and generated based on any one of the packet loss frequency information, the retransmittable bandwidth information, the reception buffer capacity information, the round-trip delay time information, or a combination of all of these information.

本発明によれば、サービスを運用中であってもその伝送路の特性に応じた受信バッファ量を調整することが可能となるため、受信装置から他の装置に対して情報を出力する際に、遅延を感じさせることなく、かつ、画像のゆらぎや画質劣化を生じさせることなく情報を出力させることができる。   According to the present invention, since it is possible to adjust the reception buffer amount according to the characteristics of the transmission path even when the service is in operation, when the information is output from the reception device to another device, Thus, information can be output without causing a delay and without causing fluctuations in the image or deterioration in image quality.

以下に、各発明の実施の形態を説明する。なお、本発明はこれら実施の形態に何ら限定されるものではなく、その要旨を逸脱しない範囲において、種々なる態様で実施し得る。   Hereinafter, embodiments of each invention will be described. In addition, this invention is not limited to these embodiments at all, and can be implemented in various modes without departing from the gist thereof.

図１は、送信装置と、受信装置と、を含むシステムの図である。送信装置は、パケット化した情報を外部の装置から受信したり、あるいは送信装置内部にてパケット化処理を行ってパケットを取得する。パケット化する情報は、主にリアルタイム性が要求される情報であり、具体的な一例としては映像情報があげられる。   FIG. 1 is a diagram of a system including a transmission device and a reception device. The transmitting apparatus receives packetized information from an external apparatus or performs packetization processing inside the transmitting apparatus to acquire a packet. The information to be packetized is information that mainly requires real-time properties, and a specific example is video information.

送信装置１０は、送信パケットをバッファする送信バッファ部１１を有している。また、パケットを受信装置に対して送信するとともに、送信バッファ部に格納する送信部１２を有している。また、送信部から送信されるパケットか、送信バッファ部にて格納されているパケットのいずれかを選択出力させるためのセレクタ１３を有する。また、受信装置からのパケット再送要求に応じてパケットを再送するパケット再送制御部１４を有している。   The transmission apparatus 10 includes a transmission buffer unit 11 that buffers transmission packets. Moreover, it has the transmission part 12 which transmits a packet with respect to a receiver, and stores it in a transmission buffer part. In addition, a selector 13 is provided for selecting and outputting either a packet transmitted from the transmission unit or a packet stored in the transmission buffer unit. Further, it has a packet retransmission control unit 14 that retransmits a packet in response to a packet retransmission request from the receiving apparatus.

受信装置２０は、送信装置から送信されるパケットを受信するパケット受信部２１と、受信したパケットをバッファする受信バッファ部２２と、送信装置との間の伝送路の特性を示す情報である伝送路特性情報を取得する伝送路特性情報取得部２３と、取得した伝送路特性情報に基づいて、受信バッファ部におけるバッファ読出閾値を可変調整可能な受信バッファ調整部２４と、を有する。   The reception device 20 includes a packet reception unit 21 that receives a packet transmitted from the transmission device, a reception buffer unit 22 that buffers the received packet, and a transmission path that is information indicating characteristics of a transmission path between the transmission device. A transmission path characteristic information acquisition unit 23 that acquires characteristic information, and a reception buffer adjustment unit 24 that can variably adjust a buffer read threshold in the reception buffer unit based on the acquired transmission path characteristic information.

伝送路特性情報取得部２３は、送信装置との間の伝送路の特性を示す情報である伝送路特性情報を取得する。伝送路特性情報とは、たとえば、受信パケットのパケットロス頻度情報、再送可能帯域情報、受信バッファの容量情報、往復遅延時間情報のいずれか又はこれら全部の情報の組み合わせに基づいて算出して生成される情報である。以下、これらの情報と受信バッファ量との関係について説明する。   The transmission path characteristic information acquisition unit 23 acquires transmission path characteristic information that is information indicating characteristics of a transmission path between the transmission apparatus. The transmission path characteristic information is, for example, calculated and generated based on any one of packet loss frequency information of received packets, retransmittable bandwidth information, reception buffer capacity information, round-trip delay time information, or a combination of all of these information. Information. Hereinafter, the relationship between these pieces of information and the reception buffer amount will be described.

受信パケットのパケットロスの発生頻度が多い場合には、必要とされる受信バッファ量は多くなる。再送可能帯域情報とは、たとえば送信装置から受信装置への送信レートの最大値と、送信されるパケットのレートと、に基づいて生成される再送パケットの送信可能な帯域を示す情報であり、この再送可能帯域情報で示される再送パケットの送信可能な帯域が多い場合には、必要とされる受信バッファ量は少なくなる。往復遅延時間情報（ＲＴＴ）とは、受信装置から送信装置に対して再送要求パケットを出力して、実際にパケットが送信装置から受信装置に対して再送される遅延時間を示す情報であり、往復遅延時間情報が長い場合には、必要とされる受信バッファ量は多くなる。なお、受信バッファの容量情報は、受信バッファの現在の設定値や、受信バッファの最大許容値などを示す情報である。   When the frequency of occurrence of packet loss of received packets is high, the amount of reception buffer required increases. The retransmittable bandwidth information is, for example, information indicating the transmittable bandwidth of a retransmission packet generated based on the maximum value of the transmission rate from the transmission device to the reception device and the rate of the transmitted packet. When the retransmittable bandwidth indicated by the retransmittable bandwidth information is large, the amount of reception buffer required is small. The round-trip delay time information (RTT) is information indicating a delay time in which a retransmission request packet is output from the receiving apparatus to the transmitting apparatus and the packet is actually retransmitted from the transmitting apparatus to the receiving apparatus. When the delay time information is long, the amount of reception buffer required increases. The capacity information of the reception buffer is information indicating the current setting value of the reception buffer, the maximum allowable value of the reception buffer, and the like.

図２は、以上の処理の具体的な計算方法の算出ファクターの一例を示す図である。また、図３は、図２で示したファクターを利用した具体的な計算方法の一例である。   FIG. 2 is a diagram illustrating an example of calculation factors of a specific calculation method for the above processing. FIG. 3 is an example of a specific calculation method using the factors shown in FIG.

本実施形態は、主にギガ・ビット・イーサネット（登録商標）にて用いることができるため、たとえば算出した結果の受信バッファ量について、他の端末装置にてその情報を表示させてもよい。また、必要とされる受信バッファ量に関する情報を経時的に保持しておき、その遷移をモニタ表示させてもよい。なお、モニタ表示される情報としては、例えば４ｍｓや１ｓのように、秒単位での表示方法がなされてもよい。例えばパケットを固定長にて送信する場合には、バッファするパケットの量を計算することで、表示することが可能である。秒単位で表示することでユーザにとってはどの程度の遅延であるかを視覚的に確認できるというメリットがある。   Since this embodiment can be used mainly with Gigabit Ethernet (registered trademark), for example, the information about the calculated reception buffer amount may be displayed on another terminal device. Further, information regarding the required reception buffer amount may be retained with time, and the transition may be displayed on a monitor. The information displayed on the monitor may be displayed in units of seconds, such as 4 ms or 1 s. For example, when a packet is transmitted at a fixed length, it can be displayed by calculating the amount of packets to be buffered. By displaying in units of seconds, there is an advantage that it is possible to visually confirm how much delay the user has.

なお、具体的に受信装置の受信バッファ量を調整する場合には、たとえば受信装置側にて自動的に調整する処理が実行されてもよい。なお、伝送路を用いたパケットの送受信が運用中である場合には、受信バッファ量を調整する場合には、映像を瞬間的に乱してしまうため、運用者が最適なタイミングで受信バッファ量の調整を実行させる実行命令を入力するとしてもよい。   When specifically adjusting the reception buffer amount of the reception device, for example, a process of automatically adjusting the reception device may be executed. In addition, when packet transmission / reception using the transmission path is in operation, when adjusting the reception buffer amount, the video is momentarily disturbed, so the operator receives the reception buffer amount at the optimal timing. An execution instruction for executing the adjustment may be input.

以上は、受信装置を含むシステムに関する内容についての説明であるが、システムの動作方法、受信バッファ量調整方法、あるいは、パケット送受信システム、パケット送受信方法など、様々な態様にて実現することが可能である。   The above is a description of the contents related to the system including the receiving device, but it can be realized in various modes such as a system operation method, a reception buffer amount adjustment method, a packet transmission / reception system, and a packet transmission / reception method. is there.

システム全体のブロック図Block diagram of the entire system 受信バッファ量の算出ファクターを示す図The figure which shows the calculation factor of the reception buffer quantity 受信バッファ量の計算方法の一例を示す図The figure which shows an example of the calculation method of reception buffer amount

符号の説明Explanation of symbols

１０ 送信装置
１１ 送信バッファ部
１２ 送信部
１３ セレクタ
１４ パケット再送制御部
２０ 受信装置
２１ パケット受信部
２２ 受信バッファ部
２３ 伝送路特性情報取得部
２４ バッファ調整部
２５ 再送要求出力部 DESCRIPTION OF SYMBOLS 10 Transmission apparatus 11 Transmission buffer part 12 Transmission part 13 Selector 14 Packet retransmission control part 20 Reception apparatus 21 Packet reception part 22 Reception buffer part 23 Transmission path characteristic information acquisition part 24 Buffer adjustment part 25 Retransmission request output part

Claims (2)

リアルタイムでパケットを送信するとともに送信するパケットをバッファし、パケット再送要求の受信によって前記バッファしたパケットの再送を行う送信装置と、送信装置からのパケットを受信して他の装置に出力するための受信装置と、を有するシステムであって、
受信装置は、
送信装置から送信されるパケットを受信するパケット受信部と、
受信したパケットをバッファする受信バッファ部と、
送信装置との間の伝送路の特性を示す情報である伝送路特性情報を取得する伝送路特性情報取得部と、
取得した伝送路特性情報に基づいて、受信バッファ部におけるバッファ読出閾値を可変調整可能な受信バッファ調整部と、
を有するシステム。 Transmitting device that transmits packets in real time and buffers packets to be transmitted, and retransmits the buffered packets upon reception of a packet retransmission request, and reception for receiving packets from the transmitting device and outputting them to other devices A system comprising:
The receiving device
A packet receiving unit for receiving a packet transmitted from the transmission device;
A reception buffer for buffering received packets;
A transmission path characteristic information acquisition unit that acquires transmission path characteristic information, which is information indicating the characteristics of the transmission path between the transmission apparatus, and
A reception buffer adjustment unit capable of variably adjusting the buffer read threshold in the reception buffer unit based on the acquired transmission path characteristic information;
Having a system. 伝送路特性情報取得部は、
伝送路特性情報を、受信パケットのパケットロス頻度情報、再送可能帯域情報、受信バッファの容量情報、往復遅延時間情報のいずれか又はこれら全部の情報の組み合わせに基づいて算出して生成する伝送路特性情報生成手段を有する請求項１に記載のシステム。 The transmission path characteristic information acquisition unit
Transmission path characteristics generated by calculating transmission path characteristics information based on packet loss frequency information of received packets, retransmittable bandwidth information, reception buffer capacity information, round-trip delay time information, or a combination of all of these information The system according to claim 1, further comprising information generating means.
JP2007195253A 2007-07-26 2007-07-26 Retransmission parameter automatic calculation algorithm and system thereof Withdrawn JP2010232706A (en)

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