CN102769577A - Method and network device for achieving message retransmission - Google Patents
Method and network device for achieving message retransmission Download PDFInfo
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- CN102769577A CN102769577A CN2012102986020A CN201210298602A CN102769577A CN 102769577 A CN102769577 A CN 102769577A CN 2012102986020 A CN2012102986020 A CN 2012102986020A CN 201210298602 A CN201210298602 A CN 201210298602A CN 102769577 A CN102769577 A CN 102769577A
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Abstract
The invention provides a method and a network device for achieving message retransmission. The method includes: A. setting corresponding relation of retransmission times and retransmission time interval, setting a retransmission list and enabling the organization structure of the retransmission list to be a two-dimensional array; B. determining the retransmission time interval according to the retransmission times of retransmission message and the corresponding relation, determining the position of the retransmission message in the retransmission list according to the retransmission time interval and storing the retransmission message at the position of the retransmission list; C. deleting the retransmission message that acknowledgement character (ACK) information corresponds to if receiving the ACK information, transmitting the retransmission message if not receiving the ACK information that the retransmission message corresponds to when retransmission time interval is exceeded, deleting the retransmission message from the retransmission list, adding one time on the retransmission times of the retransmission message and executing the step B. again. The method and the network device can reduce occupation of network bandwidth by retransmission and avoid further aggravation of network congestion.
Description
Technical field
The present invention relates to the network transmission technology field, relate in particular to a kind of method and network equipment of realizing that message retransmits.
Background technology
In network transmission technology,, need retransmit some messages for correctness and the integrality that guarantees to transmit.With the dynamic routing protocol is example, and common employing of dynamic routing protocol (especially link-state routing protocol) retransmits the affirmation technology, on the route switching network equipment, extensively uses, and can guarantee the correctness and the integrality of dynamic routing protocol route learning.
Retransmit the affirmation technology through accomplishing, when the network equipment sends routing update (update) message, can this update message be joined in the local retransmission list after the transmission at LA Management Room delivery confirmation (ACK) message.When the ACK message received from neighbor device, again the update message is deleted from retransmission list; If do not receive ACK in the certain hour from neighbor device, think that then neighbor device do not receive this update message, promptly can retransmit this update message and give neighbor device.Re-transmission takes place every interval certain hour (retransmission time interval) once, when receiving corresponding ACK, the update message is deleted from retransmission list again.When network exists when congested, the time delay of transmission through network message increases, and same, the propagation delay time of update message and ACK message also will increase, and cause the network equipment can't in time receive update message and ACK message, thereby cause the re-transmission of update message.Message retransmits meeting additive decrementation subnetwork bandwidth, and too much re-transmission will further aggravate the congested of network.
It is thus clear that existing message retransmission technique is under the situation of not receiving the ACK message, to resend message according to fixing retransmit interval, this mode can be wasted the network bandwidth under the situation of network congestion, and can further aggravate the congested of network.
Summary of the invention
The present invention proposes a kind of method that realizes that message retransmits, can be under the situation of network congestion, minimizing re-transmission itself takies the network bandwidth, avoids the further aggravation of network congestion.
The present invention also proposes a kind of network equipment, can be under the situation of network congestion, and minimizing re-transmission itself takies the network bandwidth, avoids the further aggravation of network congestion.
Technical scheme of the present invention is achieved in that
A kind of method that realizes that message retransmits comprises:
A, the corresponding relation of number of retransmissions and retransmission time interval is set; Retransmission list is set, and the institutional framework of said retransmission list is a two-dimensional array;
B, confirm retransmission time interval, confirm this position of re-transmission message in retransmission list, this re-transmission message is kept in the said position of retransmission list according to retransmission time interval according to the number of retransmissions and the said corresponding relation that retransmit message;
If C receives ACK message, then that said ACK message is corresponding re-transmission message deletion; If when retransmission time interval is overtime, do not receive to retransmit the corresponding ACK message of message, then send said re-transmission message, said re-transmission message is deleted from retransmission list, and the number of retransmissions of said re-transmission message is added 1, again execution in step B.
A kind of network equipment of realizing that message retransmits comprises:
Module is set, is used to be provided with the corresponding relation of number of retransmissions and retransmission time interval; Also be used to be provided with retransmission list, the institutional framework of said retransmission list is a two-dimensional array;
Preserve module, be used for confirming retransmission time interval, confirm this position of re-transmission message in retransmission list, this re-transmission message is kept in the said position of retransmission list according to retransmission time interval according to the number of retransmissions and the said corresponding relation that retransmit message;
Retransmission module, when being used to receive ACK message, the re-transmission message deletion that said ACK message is corresponding; When also being used for when retransmission time interval is overtime, not receiving the ACK message that retransmits the message correspondence; Send said re-transmission message; Said re-transmission message is deleted from retransmission list; And the number of retransmissions of said re-transmission message added 1, indication is preserved module and is confirmed to retransmit the position of message again and preserve and retransmit message.
It is thus clear that; The method that the realization message that the present invention proposes retransmits and the network equipment can be controlled each message and independently retransmit; Thereby the minimizing number of retransmissions reduces re-transmission itself to the taking of the network bandwidth under the situation of network congestion, avoid the further aggravation of network congestion.
Description of drawings
Fig. 1 is a repeating method sketch map of the present invention;
Fig. 2 is a retransmission list polling mechanism sketch map of the present invention;
Fig. 3 is the structural representation of the network equipment of the present invention's proposition.
Embodiment
The present invention proposes a kind of message retransmission method, for each retransmits message a retransmission time interval is set, and can dynamically adjust retransmission time interval according to each number of retransmissions that retransmits message; A two-dimensional array is set as retransmission list; Retransmit the position of message in retransmission list according to retransmission time interval and current poll index calculation, will retransmit message and be saved in the corresponding position; Retransmission list is carried out automatic regular polling; When being checked through the overtime re-transmission message of retransmission time interval, should retransmit message and send, increase its number of retransmissions and recomputate retransmission time interval; Change the position of re-transmission message in retransmission list, wait for next time retransmitting.If receive before retransmit interval is overtime to retransmit corresponding affirmation (ACK) message of message, then should retransmit message and from retransmission list, delete.
The method that the realization message that the present invention proposes retransmits comprises:
A, the corresponding relation of number of retransmissions and retransmission time interval is set; Retransmission list is set, and the institutional framework of said retransmission list is a two-dimensional array;
B, confirm retransmission time interval, confirm this position of re-transmission message in retransmission list, this re-transmission message is kept in the said position of retransmission list according to retransmission time interval according to the number of retransmissions and the said corresponding relation that retransmit message;
If C receives ACK message, then that said ACK message is corresponding re-transmission message deletion; If when retransmission time interval is overtime, do not receive to retransmit the corresponding ACK message of message, then send said re-transmission message, said re-transmission message is deleted from retransmission list, and the number of retransmissions of said re-transmission message is added 1, again execution in step B.
Among the above-mentioned steps A, the corresponding relation of number of retransmissions and retransmission time interval is set,, dynamically adjusts retransmission time interval according to number of retransmissions for each message is provided with retransmission time interval;
Particularly, for each message is provided with retransmission time interval (interval), this retransmission time interval initial value is set to a default value (for example: 5 seconds), is each message accounting number of retransmissions (number) simultaneously.Use a kind of exponential backoff method, dynamically adjust retransmission time interval according to number of retransmissions, concrete mode is:
R(1)=Rmin
R (i+1)=Min (KR (i) is Rmax), as i >=1 the time;
R (i): the retransmission time interval when representing the i time re-transmission;
K is the constant that is provided with in advance, representes that this retransmission time interval is last K times;
Rmin: represent initial retransmission time interval;
Rmax: the expression maximum retransmit time interval;
Min: represent a function, get two minimum values in the parameter.
It is thus clear that the retransmission time interval of each message can constantly increase along with the increase of number of retransmissions, unrestrictedly increase for fear of retransmission time interval, for retransmission time interval is provided with maximum.
Further, definition poll index (index) and polling cycle, polling cycle equals the line number of Rmax divided by retransmission list; The initial value of index is 0, whenever then calculates (index+1) modS (wherein S representes the line number of retransmission list) through a polling cycle, with the currency of the value that calculates as index.
Among the above-mentioned steps B, retransmit message and be kept in the retransmission list, retransmission list is a two-dimensional array; Retransmit the line number at message place according to computes:
Row representes to retransmit the line number at message place;
Index representes the poll index;
Interval representes retransmission time interval;
Cyc representes polling cycle;
Round under
expression;
Mod representes delivery;
S representes the line number of retransmission list.
When the line number row in retransmission list that calculates when a plurality of re-transmission messages is identical, these message sequences are joined line number is in the row of row in the retransmission list, the columns at message place is column.Show for the retransmission list institutional framework signal that the present invention proposes like table 1.
Table 1
The network equipment constantly produces new re-transmission message, and adopts aforesaid way will retransmit message to be kept in the retransmission list.Wait for to retransmit the corresponding ACK message of message then, and if received ACK message from retransmission list this re-transmission message of deletion; Otherwise,, then send and should retransmit message, and will retransmit the correspondence position that message joins retransmission list again after recomputating retransmission time interval if still do not receive ACK message when retransmission time interval is overtime.As shown in Figure 1, the repeating method in the inventive method comprises:
Step 101: calculate the retransmission time interval that this retransmits message according to the number of retransmissions that retransmits message;
Step 102: should retransmit the position of message in retransmission list according to retransmission time interval and poll index calculation, and preserve and to retransmit message;
Step 103: judge whether to receive to retransmit the corresponding ACK message of message that if receive, then deletion should retransmit message from retransmission list; Otherwise execution in step 104;
Step 104: when the retransmission time interval that retransmits message is overtime, sends and should retransmit message, the number of retransmissions of this re-transmission message is added 1, execution in step 101 again.
In the above-mentioned steps 104; Adopt polling mechanism to judge whether the retransmission time interval that retransmits message is overtime, particularly, the polling mechanism of retransmission list is provided with a polling cycle; Polling cycle is fixed value (for example: 2 seconds); For retransmission list is provided with poll index index, each polling cycle is to after date, and the row that line number (row) is identical with (index+1) modS in the traversal retransmission list (wherein; S is the line number of retransmission list), if existence retransmits message then explains that the retransmission time interval of this re-transmission message is overtime.After traversal is accomplished, calculate (index+1) modS,, get into next polling cycle the currency of the value that calculates as index.Like Fig. 2 is retransmission list polling mechanism sketch map of the present invention, and every through a polling cycle, the network equipment then travels through the delegation in the retransmission list; For example, when the line number of retransmission list is M, the network equipment travel through successively the 1st the row, the 2nd the row ..., until (M-1) OK, return the 0th row afterwards again, proceed traversal.
If in a polling cycle, traverse the re-transmission message, explain that then these retransmission time intervals that retransmit message are overtime, need these messages be retransmitted away, and its number of retransmissions is added 1.After retransmitting completion; Need deletion should retransmit message; Recomputate the position of this re-transmission message and it is joined in the retransmission list; Therefore need use the exponential backoff method to recomputate retransmission time interval according to current number of retransmissions, will retransmit message according to retransmission time interval and join in the retransmission list again.
When receiving ACK message, in retransmission list, search corresponding re-transmission message, should retransmit message after finding and from retransmission list, delete, no longer retransmit this message, with the number of retransmissions zero clearing of this message, the re-transmission of this message is so far accomplished simultaneously.
The present invention also proposes a kind of network equipment of realizing that message retransmits, like the structural representation of Fig. 3 for the network equipment of the present invention's proposition, comprising:
Module 301 is set, is used to be provided with the corresponding relation of number of retransmissions and retransmission time interval; Also be used to be provided with retransmission list, the institutional framework of said retransmission list is a two-dimensional array;
Preserve module 302, be used for confirming retransmission time interval, confirm this position of re-transmission message in retransmission list, this re-transmission message is kept in the said position of retransmission list according to retransmission time interval according to the number of retransmissions and the said corresponding relation that retransmit message;
Above-mentionedly number of retransmissions that module 301 is provided with is set and the corresponding relation of retransmission time interval is:
R(1)=Rmin
R (i+1)=Min (KR (i), Rmax), i >=1; Wherein,
The retransmission time interval of correspondence when R (i) expression number of retransmissions is i;
K is the constant that is provided with in advance;
Rmin representes initial retransmission time interval;
Rmax representes the maximum retransmit time interval;
Min representes to get two minimum values in the parameter.
The above-mentioned module 301 that is provided with also is provided with polling cycle, and said polling cycle equals the line number of Rmax divided by retransmission list;
Above-mentioned preservation module 302 confirm to retransmit the position of message in retransmission list according to retransmission time interval, with retransmitting the mode that message is kept in the said position of retransmission list is:
Retransmit the line number at message place according to computes:
wherein
Row representes to retransmit the line number at message place;
Index representes the poll index, and the initial value of said index is 0, whenever then calculates (index+1) modS through a polling cycle, with the currency of the value that calculates as index; Wherein, S representes the line number of retransmission list;
Interval representes retransmission time interval;
Cyc representes polling cycle;
S representes the line number of retransmission list;
To retransmit message according to the aforementioned calculation result is kept in the corresponding line of said retransmission list.
Above-mentioned retransmission module 303 judges that the overtime mode of retransmission time intervals is: when polling cycle expires, and the re-transmission message of the modS that searches that line number equals in the retransmission list (index+1), the retransmission time interval of the re-transmission message that then finds is overtime.
To sum up visible; The method that the realization message that the present invention proposes retransmits and the network equipment can be provided with a retransmission time interval to each message; Retransmission time interval is increased with number of retransmissions; Reduce the frequency that message retransmits, thereby reduce the quantity that message retransmits, prevent under the situation of network congestion, to retransmit message and make congested further aggravation.
The above is merely preferred embodiment of the present invention, and is in order to restriction the present invention, not all within spirit of the present invention and principle, any modification of being made, is equal to replacement, improvement etc., all should be included within the scope that the present invention protects.
Claims (8)
1. method that realizes that message retransmits is characterized in that said method comprises:
A, the corresponding relation of number of retransmissions and retransmission time interval is set; Retransmission list is set, and the institutional framework of said retransmission list is a two-dimensional array;
B, confirm retransmission time interval, confirm this position of re-transmission message in retransmission list, this re-transmission message is kept in the said position of retransmission list according to retransmission time interval according to the number of retransmissions and the said corresponding relation that retransmit message;
If receiving, C confirms ACK message, then that said ACK message is corresponding re-transmission message deletion; If when retransmission time interval is overtime, do not receive to retransmit the corresponding ACK message of message, then send said re-transmission message, said re-transmission message is deleted from retransmission list, and the number of retransmissions of said re-transmission message is added 1, again execution in step B.
2. method according to claim 1 is characterized in that, the corresponding relation of said number of retransmissions and retransmission time interval is:
R(1)=Rmin
R (i+1)=Min (KR (i), Rmax), i >=1; Wherein,
The retransmission time interval of correspondence when R (i) expression number of retransmissions is i;
K is the constant that is provided with in advance;
Rmin representes initial retransmission time interval;
Rmax representes the maximum retransmit time interval;
Min representes to get two minimum values in the parameter.
3. method according to claim 2 is characterized in that, said steps A also comprises: polling cycle is set, and said polling cycle equals the line number of Rmax divided by retransmission list;
Confirm to retransmit the position of message in retransmission list according to retransmission time interval described in the step B, be retransmitting the mode that message is kept in the said position of retransmission list:
Retransmit the line number at message place according to computes:
wherein
Row representes to retransmit the line number at message place;
Index representes the poll index, and the initial value of said index is 0, whenever then calculates (index+1) modS through a polling cycle, with the currency of the value that calculates as index; Wherein, S representes the line number of retransmission list;
Interval representes retransmission time interval;
Cyc representes polling cycle;
S representes the line number of retransmission list;
To retransmit message according to the aforementioned calculation result is kept in the corresponding line of said retransmission list.
4. method according to claim 3; It is characterized in that; Judge among the step C that the overtime mode of retransmission time interval is: when polling cycle expires, the re-transmission message of the modS that searches that line number equals in the retransmission list (index+1), the retransmission time interval of the re-transmission message that then finds is overtime.
5. network equipment of realizing that message retransmits is characterized in that the said network equipment comprises:
Module is set, is used to be provided with the corresponding relation of number of retransmissions and retransmission time interval; Also be used to be provided with retransmission list, the institutional framework of said retransmission list is a two-dimensional array;
Preserve module, be used for confirming retransmission time interval, confirm this position of re-transmission message in retransmission list, this re-transmission message is kept in the said position of retransmission list according to retransmission time interval according to the number of retransmissions and the said corresponding relation that retransmit message;
Retransmission module is used to receive when confirming ACK message, the re-transmission message deletion that said ACK message is corresponding; When also being used for when retransmission time interval is overtime, not receiving the ACK message that retransmits the message correspondence; Send said re-transmission message; Said re-transmission message is deleted from retransmission list; And the number of retransmissions of said re-transmission message added 1, indication is preserved module and is confirmed to retransmit the position of message again and preserve and retransmit message.
6. the network equipment according to claim 5 is characterized in that, saidly the number of retransmissions of module setting is set and the corresponding relation of retransmission time interval is:
R(1)=Rmin
R (i+1)=Min (KR (i), Rmax), i >=1; Wherein,
The retransmission time interval of correspondence when R (i) expression number of retransmissions is i;
K is the constant that is provided with in advance;
Rmin representes initial retransmission time interval;
Rmax representes the maximum retransmit time interval;
Min representes to get two minimum values in the parameter.
7. the network equipment according to claim 6 is characterized in that, the said module that is provided with also is provided with polling cycle, and said polling cycle equals the line number of Rmax divided by retransmission list;
Said preservation module confirm to retransmit the position of message in retransmission list according to retransmission time interval, with retransmitting the mode that message is kept in the said position of retransmission list is:
Retransmit the line number at message place according to computes:
wherein
Row representes to retransmit the line number at message place;
Index representes the poll index, and the initial value of said index is 0, whenever then calculates (index+1) modS through a polling cycle, with the currency of the value that calculates as index; Wherein, S representes the line number of retransmission list;
Interval representes retransmission time interval;
Cyc representes polling cycle;
S representes the line number of retransmission list;
To retransmit message according to the aforementioned calculation result is kept in the corresponding line of said retransmission list.
8. the network equipment according to claim 7; It is characterized in that; Said retransmission module judges that the overtime mode of retransmission time interval is: when polling cycle expires; The re-transmission message of the modS that searches that line number equals in the retransmission list (index+1), the retransmission time interval of the re-transmission message that then finds is overtime.
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| CN109697113A (en) * | 2018-12-29 | 2019-04-30 | 广州华多网络科技有限公司 | Request method, apparatus, equipment and the readable storage medium storing program for executing retried |
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