WO2011110130A2 - Procédé de réglage de redondance de paquets, dispositif et système de réseau associés - Google Patents

Procédé de réglage de redondance de paquets, dispositif et système de réseau associés Download PDF

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Publication number
WO2011110130A2
WO2011110130A2 PCT/CN2011/073255 CN2011073255W WO2011110130A2 WO 2011110130 A2 WO2011110130 A2 WO 2011110130A2 CN 2011073255 W CN2011073255 W CN 2011073255W WO 2011110130 A2 WO2011110130 A2 WO 2011110130A2
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WO
WIPO (PCT)
Prior art keywords
redundancy
packet loss
packet
sequence
occurrences
Prior art date
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PCT/CN2011/073255
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English (en)
Chinese (zh)
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WO2011110130A3 (fr
Inventor
胡国杰
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华为技术有限公司
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Application filed by 华为技术有限公司 filed Critical 华为技术有限公司
Priority to CN201180000267.5A priority Critical patent/CN102845008B/zh
Priority to PCT/CN2011/073255 priority patent/WO2011110130A2/fr
Publication of WO2011110130A2 publication Critical patent/WO2011110130A2/fr
Publication of WO2011110130A3 publication Critical patent/WO2011110130A3/fr

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Classifications

    • 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
    • H04L1/0001—Systems modifying transmission characteristics according to link quality, e.g. power backoff
    • H04L1/0009—Systems modifying transmission characteristics according to link quality, e.g. power backoff by adapting the channel coding

Definitions

  • the present invention relates to the field of communications technologies, and in particular, to a packet redundancy adjustment method, related device, and network system. Background technique
  • IP Internet Protocol
  • VoIP Voice over IP
  • a VoIP network can carry services with high real-time requirements, such as real-time voice, real-time video, and real-time data.
  • RTP Real-Time Transfer Protocol
  • IP networks that is defined to operate in a one-to-one or one-to-many transmission with the goal of providing time information and media stream synchronization.
  • UDP user datagram protocol
  • ATM asynchronous transfer mode
  • the format of the voice packet on a typical VoIP network is: physical link layer + IP protocol layer + UDP protocol layer + RTP protocol layer + voice data.
  • RTP itself only guarantees the transmission of real-time data, but since the IP network is for an unreliable network with no connection, the RTP packet may be lost during transmission.
  • the real-time service requires the quality of service ("Qos") to meet certain requirements.
  • Qos quality of service
  • the general requirement is that the packet loss rate is less than 1%, the delay is less than 100 milliseconds (ms), and the network jitter is less than 20 ms. Therefore, in order to guarantee the Q 0S of the real-time service, a redundant mechanism is needed to recover the lost data during the transmission.
  • RTP redundancy mechanism
  • Each current RTP packet carries the content of the previous or the first few RTP packets.
  • RTP packet When an RTP packet is lost, it can be carried from the subsequent RTP packet. Recover lost RTP packets in redundancy. For example, when sending, if there is no redundancy
  • the packet transmission sequence is RTP1, RTP2, RTP3, and RTP4, where RTPi represents the i-th RTP packet.
  • each RTP message carries a redundant packet
  • the message transmission sequence is RTP1, RTP2/RTP1, RTP3/RTP2, RTP4/RTP3; if each RTP message carries two redundant packets, the message transmission sequence It is RTP1, RTP2/RTP1, RTP3/RTP2/RTP1, RTP4/RTP3/RTP2.
  • the part after the first "/" in the message is called the redundancy package, and the part before the first "/" is called If there is no packet loss during the transmission, the receiver only uses the primary packet as a valid service packet and discards the redundant packet.
  • the basic principle of the redundancy mechanism defined by the RFC2733 protocol is: Add redundant messages carrying Forward Error Correction (FEC) information to the transmitted message sequence, and the receiver can use redundancy.
  • the packet recovers the lost RTP packet.
  • a plurality of RTP packets may be extracted from the media data stream, and XORed, and a redundant packet containing FEC information may be generated, and the redundant packet may be used by the receiving end to recover any An RTP message used to generate it.
  • the sequence of message transmission when there are no redundant messages is a, b, c, d.
  • the sequence of sending packets with redundant packets is a, b, f(a, b), c, d, f(c, d), where f(a, b) is a redundant message, indicating The result of the exclusive OR of the text a and the message b.
  • the redundant packets f(a, b) and f(c, d) are directly discarded; if the packet b is lost, the packet a and the packet f(a, b) are sent. After the XOR, the message b can be recovered, thereby realizing the packet loss compensation.
  • the loss of two consecutive texts can be compensated.
  • the messages b, c are lost, then a and f(a, b) XOR can be restored to b, and b and f(b, c) XOR can be restored (.
  • the prior art solution When the RTP redundancy mechanism defined in RFC 2198 is used, the prior art solution generally determines the number of redundant packets carried in each RTP packet during call setup, and each packet carries a fixed redundancy packet during the call process.
  • the prior art scheme When using the RTP redundancy mechanism defined by RFC2733, the prior art scheme generally determines the redundant error correction mode used by the call when the call is established, and uses the redundant error correction mode during the call.
  • the embodiment of the invention provides a packet redundancy adjustment method, a related device and a network system, which can reduce the service packet loss rate and ensure the service quality.
  • a packet redundancy adjustment method includes:
  • the control sender sends a message to the receiving end by using the redundancy to be used.
  • a transmitting device comprising:
  • An obtaining unit configured to acquire the number of occurrences of each packet loss event in the message sequence that the sending device has sent to the receiving device;
  • a redundancy determining unit configured to determine a redundancy to be used according to the number of occurrences of each packet loss event, where the redundancy to be used is to enable the packet loss rate of the packet sequence to meet the packet loss requirement. The smallest redundancy among the redundancy;
  • a sending unit configured to send a message to the receiving device by using the redundancy to be used.
  • a network system comprising: the above sending device, and a receiving device,
  • the receiving device is configured to receive the message sequence and the message sent by the sending device, and report the number of occurrences of each packet loss event in the message sequence to the sending device.
  • the control sender sends a message to the receiving end by using the redundancy to be used. Since the packet loss rate after the redundancy compensation to be used satisfies the packet loss requirement, the quality of the service can be ensured; and the redundancy to be used at the transmitting end is the smallest redundancy among the redundancy that satisfies the packet loss requirement. Therefore, the bandwidth required for service transmission can be reduced, and the waste of bandwidth can be avoided.
  • FIG. 1 is a flowchart of a method for adjusting packet redundancy according to an embodiment of the present invention
  • FIG. 2 is a flowchart of a message redundancy adjustment method for performing budget based on redundancy from large to small according to an embodiment of the present invention
  • FIG. 3 is a flowchart of a message redundancy adjustment method for performing budget based on redundancy from small to large according to an embodiment of the present invention
  • FIG. 4 is a structural diagram of a transmitting device according to an embodiment of the present invention.
  • FIG. 5 is a structural diagram of another sending device according to an embodiment of the present invention.
  • FIG. 6 is a structural diagram of still another transmitting device according to an embodiment of the present invention.
  • FIG. 7 is a structural diagram of a transmitting device with a timer according to an embodiment of the present invention.
  • FIG. 8 is a structural diagram of a network system according to an embodiment of the present invention. detailed description
  • an embodiment of the present invention provides a packet redundancy adjustment method, where the method includes: 101. Obtain a number of occurrences of each packet loss event in a packet sequence that has been sent by a sending end to a receiving end.
  • the execution body of each step of the embodiment of the present invention may be a sender or a receiver.
  • the packet loss event in the packet sequence in the step may include: losing one packet event, dropping two packet events, dropping three packet events, and dropping four packet events. Among them, the loss of one packet event is that only one valid service packet is lost when the event occurs; the loss of two packet events is that two valid service packets are continuously lost when the event occurs; the three packet events are lost continuously when the event occurs.
  • One valid service package; the loss of 4 packet events is the continuous loss of 4 valid service packets when the event occurs.
  • the lost i packet event in the embodiments of the present invention refers to an event in which one valid service packet is lost.
  • the step may be: the sending end sends the message sequence to the receiving end by using the specific redundancy, and the number of occurrences of each packet loss event in the message sequence reported by the receiving end is obtained; wherein, the specific redundancy It may be 0, that is, the transmitting end sends the sequence of the packet without performing packet loss compensation, and the specific redundancy may also be 1, 2 or the like.
  • the redundancy is carried in each RTP packet allowed by the sender.
  • the number of redundant packets For the RFC2733 protocol, the redundancy indicates the forward error correction mode, and the forward error correction mode with the redundancy of 1 can compensate for one packet event; the redundancy is 2 for the forward direction.
  • the error correction mode can compensate for 2 packet events; the forward error correction mode with redundancy 3 can compensate for 3 packet events; the forward error correction mode with redundancy 4 can compensate for 4 packet events. .
  • the packet transmission sequence of the forward error correction mode indicated by the redundancy degree may be: a, b, f(a, b), c, d, f(c, d);
  • the sequence of message transmission in the forward error correction mode indicated by 2 may be: a, f(a, b), b, f(b, c), c, f(c, d), d;
  • the sequence of message transmission in the forward error correction mode indicated by 3 may be: a, b, f(a, b, c), c, f(a, c, d), f(a, b, d), d
  • a, b, c, and d in the above-mentioned respective message transmission sequences are valid service packets, f(a, b), f(b, c), f(c, d), f(a, b, c), f(a, c, d), f(a, b,
  • the redundancy to be used Determine, according to the number of occurrences of each packet loss event, the redundancy to be used, where the redundancy to be used is the smallest redundancy that enables the packet loss rate of the packet sequence to meet the packet loss requirement. Redundancy.
  • the packet loss requirement is smaller than the preset packet loss threshold; the packet loss rate of the packet sequence is the sum of packet loss rates caused by each packet loss event.
  • the total packet loss rate ie, the packet loss rate of each packet loss event
  • the compensation method with redundancy of 1 can also ensure that the total packet loss rate after compensation is 0.
  • the redundancy to be used determined in this step is the smallest redundancy among the redundancy of the packet loss rate and the packet loss requirement.
  • the step 102 may be implemented in the following manner: According to the number of occurrences of each packet loss event, the maximum redundancy is decremented, and the determining step is performed on the redundancy one by one, and the determining step is to determine the redundancy. Whether the packet loss rate of the compensated packet sequence satisfies the packet loss requirement; and the minimum redundancy that can satisfy the packet loss requirement is determined as the redundancy to be used.
  • the packet loss rate of each packet loss event greater than j is obtained, and then the sum of packet loss rates of each packet loss event greater than j is obtained, and the sum is The packet loss rate of the packet sequence compensated by the redundancy j; or, first, the sum of the number of packet loss events of each packet loss event greater than j, and dividing the sum by the message sequence The number of valid service packets is obtained, and the packet loss rate of the message sequence compensated by the redundancy j is obtained.
  • performing a determining step on the redundancy one by one, indicating that the determining step is performed from the maximum redundancy, does not mean that the determining step is performed for all the redundancy, and The decision step is stopped after finding the redundancy to be used.
  • the control sending end sends the message to the receiving end by using the redundancy to be used.
  • the execution body of each step of the embodiment of the present invention may be a sender or a receiver. If the sender of the entity is executed, the sender directly receives the redundancy to be used in the step 103. If the executor is the receiving end, the receiving end returns the indication information indicating the redundancy to be used to the sending end, and after receiving the indication information, the transmitting end uses the redundancy to be used. Send a message to the receiver.
  • step 101, step 102, and step 103 may be performed periodically, that is, step 101, step 102, and step 103 are performed every predetermined period to adjust the redundancy in time according to the transmission environment. That is, when the cycle time arrives, the sender sends the message sequence for the test to the receiver with a certain degree of redundancy, and then obtains the number of occurrences of each packet loss event in the message sequence for the test reported by the receiver. And determining the redundancy to be used according to the number of occurrences of each packet loss event; optionally, when the cycle time arrives, the sender does not send the message sequence for testing, but directly utilizes the specific redundancy. Sends a sequence of data packets to be transmitted during the call to the receiving end, such as an RTP packet sequence, and obtains the number of occurrences of each packet loss event in the packet sequence reported by the receiving end.
  • a sequence of data packets to be transmitted during the call to the receiving end, such as an RTP packet sequence, and obtains the number of occurrences
  • the step 101, the step 102, and the step 103 are performed when the packet loss ratio is greater than or equal to the packet loss threshold, that is, when the current packet loss rate of the packet sequence is greater than or equal to the packet loss threshold, the step is performed.
  • the step 102 and step 103 in order to adjust the redundancy in time when the transmission environment is deteriorated, and ensure the quality of the service transmission.
  • the minimum redundancy among the redundancy that can make the packet loss rate of the packet sequence meet the packet loss requirement is the redundancy to be used.
  • the control sender then sends a message to the receiving end using the redundancy to be used. Since the packet loss rate after the redundancy compensation to be used satisfies the packet loss requirement, the quality of the service can be guaranteed;
  • the redundancy used is the smallest redundancy among the redundancy that satisfies the packet loss requirement. Therefore, the bandwidth required for service transmission can be reduced, and the waste of bandwidth can be avoided.
  • an embodiment of the present invention provides a method for adjusting packet redundancy, which is
  • the RTP packet of the RFC 2198 protocol is used to calculate the sum of the packet loss rates of events according to the redundancy from large to small.
  • the method includes:
  • the sending end determines the maximum redundancy and the packet loss threshold of the current service.
  • the packet loss threshold is determined by the type of the current service.
  • the real-time voice service has a packet loss threshold of 1%
  • the real-time data service has a packet loss threshold of 0%.
  • the maximum redundancy is the maximum redundancy allowed by the sender.
  • the maximum redundancy is usually preset in the product, and the maximum redundancy of different models can be different.
  • the sending end does not use the packet loss compensation mode, and directly sends an RTP message sequence to the receiving end.
  • the sender uses a redundancy of zero.
  • the receiving end determines the number of occurrences of each packet loss event in the RTP packet sequence according to the sequence number of the received RTP packet, and reports the real-time transport control protocol (Real-Time Transport Control Protocol) to the transmitting end.
  • the RTCP packet carries the number of occurrences of each packet loss event
  • the sender obtains a prediction result of the network environment according to the RTCP packet, wherein the prediction result of the network environment includes the number of occurrences of each packet loss event, The total packet loss rate in the RTP message sequence.
  • the RTP protocol and the RTCP protocol are used together.
  • the RTP protocol is used to transmit service packets.
  • the RTCP protocol is used to monitor and feedback the transmission of RTP packets on the IP network. During the call progress, the receiver periodically sends The sender feeds back the RTCP packet.
  • the RTP packet has a unique sequence number.
  • the receiving end determines the number of occurrences of each packet loss event according to the sequence number of the received RTP packet, for example, in the RTP packet sequence sent by the sender. There are 10 RTP messages, and the sequence numbers are 1-10. If the RTP message sequence number received by the receiver is 1, 2, 3, 5, 8, or 10, the receiver does not receive the sequence.
  • the number of occurrences is the second (that is, one packet loss event is the RTP packet with the sequence number 4 lost, and the other one packet event is the RTP packet with the sequence number 9 lost).
  • the number of occurrences of the two packet events is lost. It is 1 time (that is, the RTP message with sequence number 6 and the RTP message with sequence number 7 are lost).
  • the RTCP packet may also carry the number of packet loss caused by each packet loss event, the packet loss rate caused by each packet loss event, and the total number of packet loss in the RTP packet sequence.
  • the existing RTCP packet includes: a cumulative number of packets lost field, an extended highest sequence number received field, and a draft-specific extension (profile). a specific extensions field, where the accumulated packet loss number field identifies the total number of lost packets in a period of time.
  • the RTP packet sequence is transmitted during the time period, and the accumulated packet loss number field identifies the above.
  • the total number of lost packets in the RTP packet sequence; the extended received highest sequence number field identifies the sequence number of the packet loss statistics.
  • the embodiment of the present invention extends the draft-specific extension field, and the number of occurrences of each packet loss event is carried in the draft-specific extension field.
  • the number of packet loss caused by each packet loss event may also be carried, and each packet loss event is caused. The rate of packet loss and so on.
  • step 204 The sending end determines whether the timer expires. If yes, step 205 is performed, and if no, step 211 is performed.
  • the duration of the preset timer of the sending end, when the timer expires, indicates the time when the transmitting end adjusts the redundancy.
  • the redundancy j is the redundancy of the packet loss rate to be predicted.
  • the sum of the packet loss ratios of the packet loss events is compared with the packet loss rate of each packet loss event, and the sum of the packet loss ratios of the packet loss events is smaller than the packet loss threshold. If yes, go to step 207; , go to step 210.
  • the sending end determines whether j is equal to 0. If yes, go to step 208. If no, go to step 209.
  • the sending end determines that the redundancy degree is the redundancy to be used, and performs step 211.
  • the sender determines that j+1 is the redundancy to be used.
  • the sender determines j as the redundancy to be used.
  • the sending end determines whether the currently performed call service ends. If no, go to step 212. If yes, end the process.
  • the sending end sends the RTP packet to the receiving end by using the redundancy to be used.
  • the sum of the packet loss rates of the packet loss events after budget compensation according to the redundancy degree is large and small, and according to the budget result
  • the redundancy to be used by the transmitting end is determined, where the redundancy to be used by the transmitting end is the smallest redundancy among the redundancy of the packet loss rate and the redundancy of the packet loss threshold. Since the packet loss rate of the RTP packet sent by the subsequent redundancy is smaller than the packet loss threshold, the quality of the service can be guaranteed; since the redundancy is the smallest redundancy among the redundancy smaller than the packet loss threshold. Therefore, the bandwidth required for service transmission can be reduced, and the waste of bandwidth can be avoided.
  • the test results of the network environment include: the number of occurrences of each packet loss event, and each packet loss. The number of packet loss caused by the event, the packet loss rate caused by each packet loss event, the total packet loss rate, and the probability of each packet loss event occupying the total packet loss event.
  • the number of lost packets, the packet loss rate caused by each packet loss event, the total packet loss rate, and the probability of each packet loss event occupying the total packet loss event are respectively obtained by the received message in a period of time.
  • the RTP packet sequence is transmitted during the period of time, and the number of occurrences of each packet loss event and each The number of packet loss caused by the packet loss event, the packet loss rate caused by each packet loss event, the total packet loss rate, and the probability of each packet loss event occupying the total packet loss event are:
  • the packet loss event in the above RTP packet sequence The number of occurrences, the number of lost packets caused by each packet loss event, the packet loss rate caused by each packet loss event, the total packet loss rate, and the probability of each packet loss event accounting for the total packet loss event.
  • the packet loss threshold of the current call service is 3%. After the packet loss occurs, the packet loss rate does not need to be compensated to 0. The total packet loss rate of each packet loss event is less than the packet loss after packet loss compensation. The threshold is OK.
  • the packet loss rate is 0; then consider using the redundancy of 3 to compensate.
  • the redundancy 3
  • the packet loss caused by one packet loss, two packet events, and three packet events can be compensated.
  • the compensation is 3, and the packet loss rate is 15/30000. It can be seen that the packet loss rate is less than the loss.
  • Package threshold Consider the method of using the redundancy of 2 to compensate. When the redundancy is 1, the packet loss caused by losing one packet event and dropping two packet events can be compensated. For the loss of three packets.
  • the packet loss caused by the event 2 packets are compensated, and 1 packet is not compensated.
  • the packet loss caused by the 4 packet event 2 packets are compensated, and 2 packets are not compensated.
  • the number of lost packets caused by 3 packet loss events is 105, and the number of lost packets caused by 4 packet loss events is 30.
  • the total packet loss rate is (105+30) / 30000. It can be seen that the total packet loss rate is less than the packet loss. Threshold; consider using the method of redundancy 1 to compensate. After the compensation is 1 mode, the packet loss caused by one packet event can be compensated.
  • the packet loss rate is 0% due to the loss of one packet event, and the packet loss rate caused by the loss of two packet events is 1.77%, and the packet loss caused by three packet events is lost.
  • the rate is 0.70%, and the packet loss rate caused by a packet loss event is 0.15 %.
  • the sum of the packet loss rates caused by each packet loss event is 2.62%, which is less than 3%. Therefore, the compensation method with redundancy of 1 is used. Can guarantee the quality of the business.
  • another embodiment of the present invention provides a packet redundancy adjustment method.
  • the method uses an RTP packet conforming to the RFC2198 protocol as an example, and the packet loss rate of each event is budgeted according to the redundancy from small to large. And, the method specifically includes:
  • Steps 301-303 are the same as steps 201-203, and are not described herein again.
  • step 304 The sending end determines whether the timer expires. If yes, step 305 is performed. If no, step 310 is performed.
  • the sender's budget is compensated by the redundancy j, the sum of the packet loss rate of each packet loss event, comparing whether the sum of the packet loss rate of each packet loss event is greater than or equal to the packet loss threshold, and if so, executing step 307; If no, go to step 309.
  • the sender determines whether j is equal to N. If no, returns to step 306; if yes, step 309 is performed.
  • Steps 310-311 are the same as steps 211-212, and are not described herein again.
  • an embodiment of the present invention provides a sending device, including:
  • the obtaining unit 10 is configured to acquire the number of occurrences of each packet loss event in the message sequence that the sending device has sent to the receiving device.
  • the redundancy determining unit 20 is configured to determine, according to the number of occurrences of each packet loss event, the redundancy to be used, where the redundancy to be used is to enable the packet loss rate of the packet sequence to meet the packet loss requirement.
  • the sending unit 30 is configured to send a message to the receiving device by using the redundancy to be used.
  • the obtaining unit 10 is specifically configured to send the message sequence to the receiving device by using a specific redundancy, and obtain the number of occurrences of each packet loss event in the message sequence reported by the receiving device.
  • the specific redundancy may be 0 or other values, which does not affect the implementation of the present invention.
  • the redundancy determining unit 20 may specifically include: a determining unit 21, configured to perform decrementing from the maximum redundancy according to the number of occurrences of each packet loss event, and perform a determining step on the redundancy one by one, The determining step is to determine whether the packet loss rate of the packet sequence after the redundancy compensation is used meets the packet loss requirement; and the determining unit 22 is configured to determine the minimum redundancy that can satisfy the packet loss requirement. For redundancy to be used.
  • the packet loss rate of the packet sequence compensated by the redundancy j is obtained according to the number of packet loss events of each packet loss event greater than j and the number of valid service packets in the packet sequence.
  • the implementation is similar to the method embodiment and will not be mentioned here.
  • the sending device further includes: a timer 40, configured to trigger, when the timing time arrives, the acquiring unit to send the packet to the receiving device by using a specific redundancy. sequence.
  • the message sequence may be a sequence of messages used for testing, or a sequence of messages to be transmitted between the sending device and the receiving device, such as an RTP message sequence, which does not affect the implementation of the present invention;
  • the message sent by 30 is an RTP message that needs to be transmitted between the sending device and the receiving device.
  • the minimum redundancy among the redundancy that enables the packet loss rate of the message sequence to meet the packet loss requirement is the redundancy to be used, and then the transmitting unit uses the redundancy to be used to the receiving device.
  • Send a message is a message that specifies the redundancy of the packet loss rate of the message sequence to meet the packet loss requirement.
  • an embodiment of the present invention provides a network system, including: a sending device 50 and a receiving device 60, where
  • the sending device 50 is configured to obtain the number of occurrences of each packet loss event in the message sequence that the sending device 50 has sent to the receiving device 60, and determine the redundancy to be used according to the number of occurrences of each packet loss event, where to be used
  • the redundancy is the smallest redundancy in the redundancy that enables the packet loss rate of the packet sequence to meet the packet loss requirement; and the packet is sent to the receiving device 60 by using the redundancy to be used;
  • the receiving device 60 is configured to receive the message sequence and the message sent by the sending device 50, and report the number of occurrences of each packet loss event in the message sequence to the sending device.
  • the structure and function of the specific sending device may be the same as the structure and function of the sending device in the embodiment shown in FIG. 4 to FIG. 7 , and details are not described herein again.
  • the sending device determines, according to the number of occurrences of each packet loss event in the packet sequence, that the redundancy of the packet sequence can meet the packet loss requirement, and the minimum redundancy is the redundancy to be used.
  • the redundancy is then sent to the receiving device using the redundancy to be used. Since the packet loss rate after the redundancy compensation is used to meet the packet loss requirement, the service quality can be guaranteed; since the redundancy is the smallest redundancy among the redundancy requirements for meeting the packet loss requirement, the service transmission can be performed. The required bandwidth is reduced to avoid wasting bandwidth.

Abstract

Selon l'invention, un procédé de réglage de redondance de paquets comprend les étapes suivantes: l'acquisition des temps d'occurrence de chaque événement de perte de paquets dans une suite de paquets envoyée par un expéditeur à un destinataire; en fonction des temps d'occurrence de chaque événement de perte de paquets, une redondance à utiliser est déterminée qui est la redondance minimale parmi celles qui font que le facteur de perte dans la suite de paquets est conforme au critère établi pour la perte de paquets; l'expéditeur reçoit l'instruction d'envoyer des paquets au destinataire en utilisant la redondance prévue à cet effet. Un dispositif de transmission comprend: une unité d'acquisition pour acquérir les temps d'occurrence de chaque événement de perte de paquets dans une suite de paquets envoyée par un expéditeur à un destinataire; une unité de détermination de redondance pour déterminer une redondance à utiliser en fonction des temps d'occurrence de chaque événement de perte de paquets, cette redondance étant la redondance minimale parmi celles qui font que le facteur de perte dans la suite de paquets est conforme au critère établi pour la perte de paquets; et une unité de transmission pour envoyer des paquets au destinataire en utilisant la redondance prévue à cet effet.
PCT/CN2011/073255 2011-04-25 2011-04-25 Procédé de réglage de redondance de paquets, dispositif et système de réseau associés WO2011110130A2 (fr)

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CN201180000267.5A CN102845008B (zh) 2011-04-25 2011-04-25 报文冗余度调整方法、相关设备及网络系统
PCT/CN2011/073255 WO2011110130A2 (fr) 2011-04-25 2011-04-25 Procédé de réglage de redondance de paquets, dispositif et système de réseau associés

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WO2017173880A1 (fr) * 2016-04-06 2017-10-12 华为技术有限公司 Procédé et dispositif pour réduire le taux de perte de paquet d'une transmission

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