CN109428777B - Method and terminal for detecting packet loss - Google Patents
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Abstract
The invention provides a method and a terminal for detecting packet loss, wherein the method comprises the steps of receiving information fed back by a receiving end, wherein the information comprises a minimum serial number of a packet which is not received by the receiving end, a maximum serial number of the packet which is received by the receiving end and receiving states of N continuous packets after the packet corresponding to the minimum serial number, and N is not more than the difference value of the maximum serial number and the minimum serial number; determining the grouping which is not received by the receiving end according to the information fed back by the receiving end; and for each packet which is not received, judging whether the packet which is not received is lost or not according to the difference value of the maximum sequence number of the received packet of the receiving end and the maximum sequence number of the transmitted packet when the packet which is not received is transmitted, so that the loss of a plurality of packets can be quickly detected at one time, and the generation of SACK can be effectively reduced or even avoided.
Description
Technical Field
The present invention relates to the field of network communications, and in particular, to a method and a terminal for detecting packet loss.
Background
In network communication, when a transmitting end and a receiving end transmit packets, there may be a case where a packet is lost, and if the transmitting end determines that a certain packet is lost, retransmission may be performed. Currently, the methods for determining packet loss are generally as follows: the first is to detect packet loss through a retransmission timeout timer RTO, when the feedback of a receiving end to a certain packet exceeds the RTO time, the packet loss is judged, and the RTO performs exponential backoff type increase along with the increase of the retransmission times of the packet, and the detection algorithm is dull in most cases, which affects the real-time performance of transmission and the overall throughput of the network; the second is that when the sending end receives three ACKs of the current minimum unacknowledged sequence number packet continuously, the packet is marked to be lost and is retransmitted quickly, the method is superior to the RTO algorithm to a certain extent, and has the defects that the opposite end is required to send at least three ACK packets, certain network consumption exists, and the method can only be used for judging the loss of the minimum unacknowledged sequence number packet, namely, only one packet can be judged to be lost at one time, and when the link loss rate is higher, the detection efficiency is low; the third method is to perform bulk packet loss detection by feedback SACK from the receiving end, and this method is only suitable for specific scenarios, such as: the method requires large consumption from both calculation amount and network flow, and when SACK is lost, the performance influence is aggravated, so it can not be used as normal detection method.
Therefore, the above methods for detecting packet loss in network communication all have obvious limitations, and especially in a weak network scenario, packet loss cannot be detected in time because of unstable links, which directly affects the real-time performance and throughput of network transmission.
Disclosure of Invention
The technical problem to be solved by the invention is as follows: the method and the terminal for detecting the packet loss can quickly detect a plurality of packet losses at one time, effectively reduce or even avoid the generation of SACK, and improve the real-time performance and the throughput of network transmission.
In order to solve the technical problems, the invention adopts a technical scheme that:
a method of detecting packet loss, comprising the steps of:
s1, receiving information fed back by a receiving end, wherein the information comprises a minimum sequence number of a packet which is not received by the receiving end, a maximum sequence number of the packet which is received by the receiving end and the receiving state of N continuous packets after the packet corresponding to the minimum sequence number, and N is not more than the difference value of the maximum sequence number and the minimum sequence number;
s2, determining the packets which are not received by the receiving terminal according to the information fed back by the receiving terminal;
s3, for each packet which is not received, judging whether the packet which is not received is lost or not according to the difference value between the maximum sequence number of the packet which is received by the receiving end and the maximum sequence number of the packet which is sent when the packet which is not received is sent.
In order to solve the technical problem, the invention adopts another technical scheme as follows:
a terminal for detecting packet loss, comprising a memory, a processor and a computer program stored on the memory and executable on the processor, the processor implementing the following steps when executing the computer program:
s1, receiving information fed back by a receiving end, wherein the information comprises a minimum sequence number of a packet which is not received by the receiving end, a maximum sequence number of the packet which is received by the receiving end and the receiving state of N continuous packets after the packet corresponding to the minimum sequence number, and N is not more than the difference value of the maximum sequence number and the minimum sequence number;
s2, determining the packets which are not received by the receiving terminal according to the information fed back by the receiving terminal;
s3, for each packet which is not received, judging whether the packet which is not received is lost or not according to the difference value between the maximum sequence number of the packet which is received by the receiving end and the maximum sequence number of the packet which is sent when the packet which is not received is sent.
The invention has the beneficial effects that: the receiving end feeds back the receiving states of a plurality of packets and the maximum sequence number of the received packets, the sending end judges whether the packets which are not received are lost or not according to the difference value of the maximum sequence number of the received packets and the maximum sequence number of the sent packets when the packets which are not received are sent, the loss of the packets is quickly detected at one time, the serialized processing in the prior art is optimized to be parallel processing, the packet retransmission efficiency is greatly improved, the probability of packet accumulation of the receiving end is greatly reduced and even kept in a reasonable range for a long time, and therefore the generation of SACK is effectively reduced and even avoided.
Drawings
FIG. 1 is a flow chart of a method of detecting packet loss according to an embodiment of the present invention;
fig. 2 is a schematic structural diagram of a terminal for detecting packet loss according to an embodiment of the present invention;
description of reference numerals:
1. detecting a packet lost terminal; 2. a memory; 3. a processor.
Detailed Description
In order to explain technical contents, achieved objects, and effects of the present invention in detail, the following description is made with reference to the accompanying drawings in combination with the embodiments.
The most key idea of the invention is that a receiving end feeds back the receiving states of a plurality of packets and the maximum sequence number of the received packets, and a sending end judges whether the unreceived packets are lost or not according to the difference value between the maximum sequence number of the received packets and the maximum sequence number of the sent packets when the unreceived packets are sent.
Referring to fig. 1, a method for detecting packet loss includes the steps of:
s1, receiving information fed back by a receiving end, wherein the information comprises a minimum sequence number of a packet which is not received by the receiving end, a maximum sequence number of the packet which is received by the receiving end and the receiving state of N continuous packets after the packet corresponding to the minimum sequence number, and N is not more than the difference value of the maximum sequence number and the minimum sequence number;
s2, determining the packets which are not received by the receiving terminal according to the information fed back by the receiving terminal;
s3, for each packet which is not received, judging whether the packet which is not received is lost or not according to the difference value between the maximum sequence number of the packet which is received by the receiving end and the maximum sequence number of the packet which is sent when the packet which is not received is sent.
From the above description, the beneficial effects of the present invention are: the receiving end feeds back the receiving states of a plurality of packets and the maximum sequence number of the received packets, the sending end judges whether the packets which are not received are lost or not according to the difference value of the maximum sequence number of the received packets and the maximum sequence number of the sent packets when the packets which are not received are sent, the loss of the packets is quickly detected at one time, the serialized processing in the prior art is optimized to be parallel processing, the packet retransmission efficiency is greatly improved, the probability of packet accumulation of the receiving end is greatly reduced and even kept in a reasonable range for a long time, and therefore the generation of SACK is effectively reduced and even avoided.
Further, the information fed back by the receiving end in step S1 is an ACK packet, where the ACK packet includes a bitmap with a length of N, and N bits from left to right of the bitmap respectively indicate the receiving states of N packets that are sequentially incremented after the packet corresponding to the minimum sequence number.
It can be known from the above description that adding a bitmap with length N to an ACK packet fed back by a receiving end realizes feedback of the receiving states of multiple packets, increases the number of packets whose receiving states can be fed back by the receiving end at one time, and the bitmap occupies a small space, which can ensure that the ACK packet does not occupy a large transmission space.
Further, the step S2 specifically includes:
and reading the minimum sequence number and bitmap information of the packet which is not received by the receiving terminal and is contained in the ACK message, and determining the packet which is not received by the receiving terminal according to the value of each bit in the bitmap information.
According to the description, the minimum sequence number and the bitmap information of the packets which are not received by the receiving end in the ACK message are read, so that the plurality of packets which are not received by the receiving end can be quickly determined at one time, and the efficiency is high.
Further, the step S3 specifically includes:
respectively setting a counter for each unreceived packet and setting an initial value to be 0;
let max _ ack _ seq denote the maximum sequence number of the packet received by the receiving end, max _ seq denote the maximum sequence number of the transmitted packet when the non-received packet is transmitted, and calculate X ═ max _ ack _ seq-max _ seq;
if X >0, making max _ seq of the non-received packet equal to max _ ack _ seq, and count of the non-received packet equal to count + X;
and if the count is greater than or equal to 3, judging that the unreceived packet is lost.
As can be seen from the above description, by setting a counter with an initial value of 0 for each packet that is not received, and updating the counter corresponding to each packet that is not received each time the feedback from the receiving end is received, when the value of the counter satisfies an empirical value, it is determined that the corresponding packet is lost, thereby ensuring the high-efficiency accuracy of packet loss determination.
Further, the step S3 further includes:
if X is 0, judging whether the packet which is not received is the packet corresponding to the minimum sequence number, if so, making the count of the packet which is not received equal to count + 1;
and if the count is greater than or equal to 3, judging that the unreceived packet is lost.
As can be seen from the above description, when X is 0, it indicates that packet retransmission is performed, transmission of a new packet is not added at the transmitting end, the count is updated in a manner of adding 1, and only the count of the packet corresponding to the minimum sequence number is updated, so that packet loss can be determined more quickly, accuracy of the counter value corresponding to each packet can be ensured, and accuracy of determination can be improved.
Referring to fig. 2, a terminal 1 for detecting packet loss includes a memory 2, a processor 3 and a computer program stored in the memory 2 and operable on the processor 3, wherein the processor 3 executes the computer program to implement the following steps:
s1, receiving information fed back by a receiving end, wherein the information comprises a minimum sequence number of a packet which is not received by the receiving end, a maximum sequence number of the packet which is received by the receiving end and the receiving state of N continuous packets after the packet corresponding to the minimum sequence number, and N is not more than the difference value of the maximum sequence number and the minimum sequence number;
s2, determining the packets which are not received by the receiving terminal according to the information fed back by the receiving terminal;
s3, for each packet which is not received, judging whether the packet which is not received is lost or not according to the difference value between the maximum sequence number of the packet which is received by the receiving end and the maximum sequence number of the packet which is sent when the packet which is not received is sent.
From the above description, the beneficial effects of the present invention are: the receiving end feeds back the receiving states of a plurality of packets and the maximum sequence number of the received packets, the sending end judges whether the packets which are not received are lost or not according to the difference value of the maximum sequence number of the received packets and the maximum sequence number of the sent packets when the packets which are not received are sent, the loss of the packets is quickly detected at one time, the serialized processing in the prior art is optimized to be parallel processing, the packet retransmission efficiency is greatly improved, the probability of packet accumulation of the receiving end is greatly reduced and even kept in a reasonable range for a long time, and therefore the generation of SACK is effectively reduced and even avoided.
Further, the information fed back by the receiving end in step S1 is an ACK packet, where the ACK packet includes a bitmap with a length of N, and N bits from left to right of the bitmap respectively indicate the receiving states of N packets that are sequentially incremented after the packet corresponding to the minimum sequence number.
It can be known from the above description that adding a bitmap with length N to an ACK packet fed back by a receiving end realizes feedback of the receiving states of multiple packets, increases the number of packets whose receiving states can be fed back by the receiving end at one time, and the bitmap occupies a small space, which can ensure that the ACK packet does not occupy a large transmission space.
Further, the step S2 specifically includes:
and reading the minimum sequence number and bitmap information of the packet which is not received by the receiving terminal and is contained in the ACK message, and determining the packet which is not received by the receiving terminal according to the value of each bit in the bitmap information.
According to the description, the minimum sequence number and the bitmap information of the packets which are not received by the receiving end in the ACK message are read, so that the plurality of packets which are not received by the receiving end can be quickly determined at one time, and the efficiency is high.
Further, the step S3 specifically includes:
respectively setting a counter for each unreceived packet and setting an initial value to be 0;
let max _ ack _ seq denote the maximum sequence number of the packet received by the receiving end, max _ seq denote the maximum sequence number of the transmitted packet when the non-received packet is transmitted, and calculate X ═ max _ ack _ seq-max _ seq;
if X >0, making max _ seq of the non-received packet equal to max _ ack _ seq, and count of the non-received packet equal to count + X;
and if the count is greater than or equal to 3, judging that the unreceived packet is lost.
As can be seen from the above description, by setting a counter with an initial value of 0 for each packet that is not received, and updating the counter corresponding to each packet that is not received each time the feedback from the receiving end is received, when the value of the counter satisfies an empirical value, it is determined that the corresponding packet is lost, thereby ensuring the high-efficiency accuracy of packet loss determination.
Further, the step S3 further includes:
if X is 0, judging whether the packet which is not received is the packet corresponding to the minimum sequence number, if so, making the count of the packet which is not received equal to count + 1;
and if the count is greater than or equal to 3, judging that the unreceived packet is lost.
As can be seen from the above description, when X is 0, it indicates that packet retransmission is performed, transmission of a new packet is not added at the transmitting end, the count is updated in a manner of adding 1, and only the count of the packet corresponding to the minimum sequence number is updated, so that packet loss can be determined more quickly, accuracy of the counter value corresponding to each packet can be ensured, and accuracy of determination can be improved.
Example one
A method of detecting packet loss, comprising the steps of:
s1, receiving information fed back by a receiving end, wherein the information comprises a minimum sequence number of a packet which is not received by the receiving end, a maximum sequence number of the packet which is received by the receiving end and the receiving state of N continuous packets after the packet corresponding to the minimum sequence number, and N is not more than the difference value of the maximum sequence number and the minimum sequence number;
the information fed back by the receiving end is an ACK message, the ACK message comprises a bitmap with the length of N, N bits of the bitmap from left to right respectively represent the receiving states of N packets which are sequentially increased after the packet corresponding to the minimum sequence number, namely the first bit of the bitmap represents: the reception status of the packet of minimum sequence number +1, the second bit indicates: the reception status of the packet of minimum sequence number +2, … …, the nth bit indicates: a reception state of a packet of minimum sequence number + N; the value of bit and the receiving state of the corresponding packet may be: 0 means not received, 1 means received; or 0 may indicate that it has been received, 1 indicates that it has not been received, and the data format of the ACK packet may be: the minimum sequence number (four bytes) of the packet which is not received by the receiving end, the maximum sequence number (four bytes) of the packet which is received by the receiving end, the length N (one byte) of the bitmap and the bitmap are not suitable to be too large, and the value of N is preferably smaller than 32;
s2, determining the packets which are not received by the receiving terminal according to the information fed back by the receiving terminal;
reading the minimum sequence number and bitmap information which are contained in the ACK message and are not received by the receiving end, and determining the packets which are not received by the receiving end according to the value of each bit in the bitmap information;
the determined packets which are not received can be put into a set according to the sequence of the packet sequence numbers from small to large;
s3, for each packet which is not received, judging whether the packet which is not received is lost or not according to the difference value between the maximum sequence number of the packet which is received by the receiving end and the maximum sequence number of the packet which is sent when the packet which is not received is sent;
adding two fields for each unreceived packet, wherein one field represents the maximum sequence number of a received packet by a receiving end, and the other field represents the maximum sequence number of a transmitted packet when the transmitting end transmits the unreceived packet, and the two fields are respectively represented by max _ ack _ seq and max _ seq, wherein the maximum sequence number of the transmitted packet when the transmitting end transmits the unreceived packet is correspondingly recorded when the transmitting end transmits the unreceived packet, and when the corresponding packet is judged to be unreceived for the first time, the corresponding value of the record is assigned to the max _ seq to serve as the initial value of the max _ seq; respectively setting a counter for each unreceived packet and setting an initial value to be 0;
traversing the set stored with the non-received packets according to the sequence of the packet sequence numbers from small to large, and executing the following steps for each traversed non-received packet:
calculating X as max _ ack _ seq-max _ seq;
if X >0, making max _ seq of the non-received packet equal to max _ ack _ seq, and count of the non-received packet equal to count + X;
if the count is greater than or equal to 3, judging that the unreceived packet is lost and needs to be retransmitted;
otherwise, no processing is carried out;
if X is 0, judging whether the packet which is not received is the packet corresponding to the minimum sequence number, if so, making the count of the packet which is not received equal to count + 1;
if the count is greater than or equal to 3, judging that the unreceived packet is lost and needs to be retransmitted;
otherwise, no processing is carried out;
if X <0, do nothing;
in order to avoid occupying too much memory space, after receiving information feedback of received confirmation after retransmission of the unreceived packet, the two corresponding fields and the counter are released.
Example two
A terminal 1 for detecting packet loss, comprising a memory 2, a processor 3 and a computer program stored on the memory 2 and executable on the processor 3, wherein the processor 3 implements the steps of the first embodiment when executing the computer program.
In summary, in the method and terminal for detecting packet loss provided by the present invention, the receiving end feeds back the receiving status of multiple packets and the maximum sequence number of the received packet, the sending end judges whether the unreceived packet is lost or not according to the difference between the maximum sequence number of the received packet and the maximum sequence number of the sent packet when the unreceived packet is sent, so as to realize fast detection of the loss of multiple packets at a time, optimize the serialized processing in the prior art to parallelized processing, greatly improve the packet retransmission efficiency, greatly reduce or even keep the probability of packet accumulation at the receiving end within a reasonable range for a long time, thereby effectively reducing or even avoiding the generation of SACK, and ensuring the high efficiency and accuracy of packet loss detection by setting reasonable judgment conditions, and simultaneously after the retransmission of the lost packet is successful, and releasing the storage space related to the grouping in time, and improving the utilization rate of the storage space.
The above description is only an embodiment of the present invention, and not intended to limit the scope of the present invention, and all equivalent changes made by using the contents of the present specification and the drawings, or applied directly or indirectly to the related technical fields, are included in the scope of the present invention.
Claims (4)
1. A method for detecting packet loss, comprising the steps of:
s1, receiving information fed back by a receiving end, wherein the information comprises a minimum sequence number of a packet which is not received by the receiving end, a maximum sequence number of the packet which is received by the receiving end and the receiving state of N continuous packets after the packet corresponding to the minimum sequence number, and N is not more than the difference value of the maximum sequence number and the minimum sequence number;
s2, determining the packets which are not received by the receiving terminal according to the information fed back by the receiving terminal;
s3, for each packet which is not received, judging whether the packet which is not received is lost or not according to the difference value between the maximum sequence number of the packet which is received by the receiving end and the maximum sequence number of the packet which is sent when the packet which is not received is sent;
the step S2 includes:
reading the minimum sequence number and bitmap information which are contained in the ACK message and are not received by the receiving end, and determining the packets which are not received by the receiving end according to the value of each bit in the bitmap information;
the step S3 specifically includes:
respectively setting a counter for each unreceived packet and setting an initial value to be 0;
let max _ ack _ seq denote the maximum sequence number of the packet received by the receiving end, max _ seq denote the maximum sequence number of the transmitted packet when the non-received packet is transmitted, and calculate X ═ max _ ack _ seq-max _ seq;
if X >0, making max _ seq of the non-received packet equal to max _ ack _ seq, and count of the non-received packet equal to count + X;
if the count is greater than or equal to 3, judging that the unreceived packet is lost;
if X is 0, judging whether the packet which is not received is the packet corresponding to the minimum sequence number, if so, making the count of the packet which is not received equal to count + 1;
and if the count is greater than or equal to 3, judging that the unreceived packet is lost.
2. The method of detecting packet loss according to claim 1,
in step S1, the information fed back by the receiving end is an ACK packet, where the ACK packet includes a bitmap with a length of N, and N bits from left to right of the bitmap respectively indicate the receiving states of N packets that are sequentially incremented after the packet corresponding to the minimum sequence number.
3. A terminal for detecting packet loss, comprising a memory, a processor and a computer program stored on the memory and executable on the processor, wherein the processor executes the computer program to perform the steps of:
s1, receiving information fed back by a receiving end, wherein the information comprises a minimum sequence number of a packet which is not received by the receiving end, a maximum sequence number of the packet which is received by the receiving end and the receiving state of N continuous packets after the packet corresponding to the minimum sequence number, and N is not more than the difference value of the maximum sequence number and the minimum sequence number;
s2, determining the packets which are not received by the receiving terminal according to the information fed back by the receiving terminal;
s3, for each packet which is not received, judging whether the packet which is not received is lost or not according to the difference value between the maximum sequence number of the packet which is received by the receiving end and the maximum sequence number of the packet which is sent when the packet which is not received is sent;
the step S2 includes:
reading the minimum sequence number and bitmap information which are contained in the ACK message and are not received by the receiving end, and determining the packets which are not received by the receiving end according to the value of each bit in the bitmap information;
the step S3 specifically includes:
respectively setting a counter for each unreceived packet and setting an initial value to be 0;
let max _ ack _ seq denote the maximum sequence number of the packet received by the receiving end, max _ seq denote the maximum sequence number of the transmitted packet when the non-received packet is transmitted, and calculate X ═ max _ ack _ seq-max _ seq;
if X >0, making max _ seq of the non-received packet equal to max _ ack _ seq, and count of the non-received packet equal to count + X;
if the count is greater than or equal to 3, judging that the unreceived packet is lost;
if X is 0, judging whether the packet which is not received is the packet corresponding to the minimum sequence number,
if yes, making the count of the packet which is not received equal to count + 1;
and if the count is greater than or equal to 3, judging that the unreceived packet is lost.
4. The terminal for detecting packet loss according to claim 3,
in step S1, the information fed back by the receiving end is an ACK packet, where the ACK packet includes a bitmap with a length of N, and N bits from left to right of the bitmap respectively indicate the receiving states of N packets that are sequentially incremented after the packet corresponding to the minimum sequence number.
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