WO2013078881A1

WO2013078881A1 - Method and apparatus for retransmitting communication packet in communication link layer

Info

Publication number: WO2013078881A1
Application number: PCT/CN2012/079671
Authority: WO
Inventors: 谢美娟
Original assignee: 中兴通讯股份有限公司
Priority date: 2011-11-28
Filing date: 2012-08-03
Publication date: 2013-06-06
Also published as: CN103138899A

Abstract

The present invention provides a method and an apparatus for retransmitting a communication packet in a communication link layer. The method comprises: calculating a retransmission frequency of a communication packet required to be retransmitted this time according to consumed time of retransmission communication of a previous communication packet, the consumed time of the retransmission communication being a difference between time of receiving a reply packet of the previous communication packet and time of sending the previous communication packet; and transmitting the communication packet required to be retransmitted this time according to the retransmission frequency obtained through calculation. By adopting the technical solution provided in the present invention, the problem in the related technology that link stability is maintained without consideration in a retransmission mechanism aspect is solved, thereby achieving the effect that the retransmission frequency is dynamically adjusted according to the status of the current network, so as to prevent network deterioration from being aggravated because of retransmission in a situation of a large network burden, and effectively alleviating the network burden.

Description

TECHNICAL FIELD The present invention relates to the field of communications, and in particular to a method and apparatus for retransmitting a communication packet in a communication link layer. In an external field environment, an Operation and Management Center (OMC) generally needs to take over a large number of evolved Node Bs (eNodeBs). The actual external field environment is more complicated, and there are more batch operations that can be performed on the network management system. These are easy to cause instability of the front and back links, which makes the network situation better or worse. The impact on the link between the OMC and the eNodeB is also compared. Large, may cause a "short-break" or "broken chain" situation. These situations are all unwilling to be seen by operators. Therefore, how to ensure the stability of the link and reduce the occurrence of short-circuit or broken links is particularly important. At present, the above problems are generally solved by dynamically adjusting the number of heartbeats to control the link burden too large, and these methods can certainly improve the network condition to some extent. However, for the actual field situation, the real cause of a momentary or broken link is not caused by too many heartbeats, but by continuous "retransmission packets". Therefore, the retransmission mechanism is the key to ensuring the stability of the link between the network management system and the network element. However, there is currently no technical solution to maintain link stability from the perspective of retransmission mechanism. In view of the above problems in the related art, an effective solution has not yet been proposed. SUMMARY OF THE INVENTION In the related art, there is no problem of maintaining link stability and the like in terms of a retransmission mechanism. The present invention provides a method and apparatus for retransmitting a communication packet in a communication link layer to at least solve the above problems. According to an embodiment of the present invention, a method for retransmitting a communication packet in a communication link layer is provided, including: calculating a retransmission of a communication packet that needs to be retransmitted according to a time taken for retransmission of communication of a previous communication packet Frequency, wherein the elapsed time of the retransmission communication is a difference between a time when the reply packet of the last communication packet is received and a time when the previous communication packet is transmitted; and the retransmission frequency according to the calculation Transmitting the communication packet that needs to be retransmitted this time. Before the retransmission frequency of the communication packet that needs to be retransmitted is calculated according to the elapsed time of the retransmission communication of the previous communication packet, the method further includes: determining that the elapsed time of the retransmission communication exceeds a predetermined threshold. The method further includes: determining whether the calculated retransmission frequency is higher than a retransmission frequency of the last retransmission communication; if yes, performing the retransmission communication according to a retransmission frequency of the last retransmission communication; If no, the retransmission communication is performed according to the calculated retransmission frequency. Before calculating the retransmission frequency of the communication packet that needs to be retransmitted according to the elapsed time of the communication packet retransmission of the previous communication packet, the method further includes: recording the transmitted communication packet into the retransmission queue and marking the sent communication packet The number of retransmissions. The method further includes: marking the number of retransmissions of the first transmitted communication packet as 0; if the reply packet of the first transmitted communication packet is not received within a predetermined time period, then the first transmitted communication is to be The number of retransmissions is increased by one. The method further includes: when the number of retransmissions reaches a preset threshold, determining that the communication link is broken. After transmitting the communication packet that needs to be retransmitted according to the calculated retransmission frequency, the method further includes: periodically checking a communication packet in the retransmission queue, and sequentially transmitting the communication packet in the retransmission queue . According to another embodiment of the present invention, there is provided a retransmission device for a communication packet in a communication link layer, comprising: a calculation module configured to calculate a retransmission required according to a time taken for retransmission of communication of a previous communication packet The retransmission frequency of the communication packet, wherein the time taken for the retransmission communication is a difference between a time when the reply packet of the previous communication packet is received and a time when the previous communication packet is transmitted; And configured to transmit, according to the calculated retransmission frequency, the communication packet that needs to be retransmitted this time. The apparatus further includes: a determining module configured to determine that the time taken for the retransmission communication exceeds a predetermined threshold. The device further includes: a determining module, configured to determine whether the calculated retransmission frequency is higher than a retransmission frequency of the last retransmission communication; if yes, notify the retransmission module to perform retransmission communication according to the last time The retransmission frequency carries out the retransmission communication; if not, the retransmission module is notified to perform the retransmission communication according to the calculated retransmission frequency. According to the embodiment of the present invention, the technical means for transmitting the communication packet that needs to be retransmitted by using the retransmission frequency of the communication packet that needs to be retransmitted according to the elapsed time of the communication packet retransmission of the previous communication packet is used, and the related information is solved. In the technology, there is no problem of maintaining link stability from the perspective of retransmission mechanism, and thus the retransmission frequency is dynamically adjusted according to the current network condition, thereby avoiding the effect of worsening the network due to retransmission under the condition of large network load. , effectively reducing the network burden. BRIEF DESCRIPTION OF THE DRAWINGS The accompanying drawings, which are set to illustrate,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,, In the drawings: FIG. 1 is a flowchart of a method for retransmitting a communication packet in a communication link layer according to an embodiment of the present invention; FIG. 2 is a diagram of a retransmission device for a communication packet in a communication link layer according to an embodiment of the present invention; 3 is a schematic structural diagram of a retransmission device of a communication packet in a communication link layer according to an embodiment of the present invention; FIG. 4 is a schematic diagram of a communication packet transmission process of an OMC transmission queue according to an embodiment of the present invention; FIG. 6 is a schematic flowchart of a communication packet transmission process of an OMC retransmission queue according to an embodiment of the present invention; FIG. 7 is a flowchart of an OMC retransmission frequency adjustment process according to an embodiment of the present invention; schematic diagram. BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, the present invention will be described in detail with reference to the accompanying drawings. It should be noted that the embodiments in the present application and the features in the embodiments may be combined with each other without conflict. 1 is a flow chart of a method for retransmitting a communication packet in a communication link layer according to an embodiment of the present invention. As shown in FIG. 1, the method includes: Step S102: Calculate a retransmission frequency of a communication packet that needs to be retransmitted according to a time taken for retransmission communication of a previous communication packet, where the time spent by the retransmission communication The difference between the time when the reply packet of the last communication packet is received and the time when the previous communication packet is sent; Step S104, transmitting the communication that needs to be retransmitted according to the calculated retransmission frequency package. Through the above processing process, since the communication packet that needs to be retransmitted can be retransmitted according to the retransmission frequency calculated by the time taken for the retransmission communication of the previous communication packet, the dynamic adjustment of the retransmission frequency of the communication packet can be realized, thereby When the network condition is degraded, the number of communication packets for retransmission communication in the network is effectively reduced by reducing the retransmission frequency, thereby avoiding continuous link-breaking reconstruction, ensuring the stability of the link, and effectively reducing the network burden. In the above embodiment, the communication packet may be a communication packet between the OMC and the eNodeB. Before the step S102, that is, before calculating the retransmission frequency of the communication packet that needs to be retransmitted according to the elapsed time of the last communication packet retransmission communication, the condition for starting the retransmission frequency adjustment may be set to avoid wasting the running resource. For example, the following conditions can be set: It is determined that the time taken for the retransmission communication exceeds a predetermined threshold. Before step S104, it may be further determined whether the retransmission communication is to be performed according to the retransmission frequency of the last retransmission communication according to the following condition: determining whether the calculated retransmission frequency is higher than the last retransmission communication. The retransmission frequency; if yes, the retransmission communication is performed according to the retransmission frequency of the last retransmission communication; if not, the retransmission communication is performed according to the calculated retransmission frequency. In order to perform retransmission more efficiently, a retransmission can be maintained for each network element's communication packet before calculating the retransmission frequency of the communication packet that needs to be retransmitted according to the elapsed time of the last communication packet retransmission communication. The queue may be specifically implemented by: recording the transmitted communication packet into a retransmission queue and marking the number of retransmissions of the transmitted communication packet. In a specific implementation of the present invention, the number of retransmissions may be counted by: marking the number of retransmissions of the first transmitted communication packet as 0; if the first transmission is not received within a predetermined time period The reply packet of the communication packet adds 1 to the number of retransmissions of the first transmitted communication. In order to avoid the continuation of the chain retransmission, the number of retransmissions may be set. Specifically, the following processing may be included: when the number of retransmissions reaches a preset threshold, the communication link is broken. In a preferred embodiment of the present invention, after the communication packet that needs to be retransmitted is transmitted according to the calculated retransmission frequency, the following processing procedure may be further included: periodically checking the communication packet in the retransmission queue. And transmitting the communication packets in the retransmission queue in sequence. In this embodiment, a retransmission device for a communication packet in a communication link layer is further provided, and the device is used to implement the foregoing embodiment and a preferred embodiment. The module is involved in the description. As used hereinafter, the term "module" may implement a combination of software and/or hardware of a predetermined function. Although the apparatus described in the following embodiments is preferably implemented in software, hardware, or a combination of software and hardware, is also possible and conceivable. 2 is a structural block diagram of a retransmission apparatus for a communication packet in a communication link layer according to an embodiment of the present invention. As shown in FIG. 2, the apparatus includes: a calculation module 20, connected to the retransmission module 22, configured to calculate a retransmission frequency of the communication packet that needs to be retransmitted according to the elapsed time of the last communication packet retransmission communication, where The elapsed time of the retransmission communication is a difference between a time when the reply packet of the last communication packet is received and a time when the previous communication packet is sent; The retransmission module 22 is configured to transmit the communication packet that needs to be retransmitted according to the calculated retransmission frequency. Preferably, as shown in FIG. 3, the foregoing apparatus may further include: a determining module 24, connected to the computing module 20, configured to determine that the elapsed time of the retransmission communication exceeds a predetermined threshold. Preferably, as shown in FIG. 3, the apparatus may further include: a determining module 26, connected to the retransmission module 22, configured to determine whether the calculated retransmission frequency is higher than a retransmission frequency of the last retransmission communication. If yes, the retransmission module is notified to perform the retransmission communication according to the retransmission frequency of the last retransmission communication; if not, the retransmission module is notified to perform the retransmission frequency according to the calculation. Retransmission communication. In order to better understand the above embodiments, the following detailed description will be made in conjunction with the preferred embodiments and the accompanying drawings. Embodiment 1 This embodiment is described by taking a communication link between an OMC and an eNodeB in the mobile communication field as an example. This embodiment provides a method for maintaining link stability by dynamically adjusting a communication packet. It should be noted that the retransmission mechanism in the related art only periodically retransmits, so that when the network condition is poor, it is bound to cause a vicious circle, which leads to a worse and worse network condition until the last link is broken, which is in this embodiment. The retransmission mechanism is different. In this embodiment, several flag values are added in the communication packet between the OMC and the eNodeB: the number of retransmissions, and the time consumed by the communication (that is, the communication time can be recorded after the time spent in the communication is calculated by the following method) In the packet, so that the next communication packet calculates the retransmission frequency of the next communication packet for retransmission according to the time consumed by the communication. The OMC maintains a retransmission queue and a reception queue for each network element. Each time the OMC sends a packet to the eNodeB, the transmission packet is recorded in the retransmission queue, and the number of retransmissions is set to zero. If the OMC receives a reply packet for this packet within the specified time, the packet is deleted from the retransmission queue. If the reply packet of this packet is not received within the specified time, the number of retransmissions of the packet is incremented by 1, and the time taken for the communication is recorded. Among them, the time spent in this communication = "send packet" when the time ij - the time when the "reply packet" was received. The OMC uses this to determine how much the frequency of subsequent retransmission packets needs to be adjusted. The OMC then enables the timing scan to send the packets in the retransmission queue at the calculated retransmission frequency. Through the above technical solution, the OMC can dynamically adjust the number of communication packets when the network communication quality is degraded (that is, dynamically adjust the number of communication packets transmitted in the same time according to the adjusted retransmission frequency), while maintaining the link stability. Next, reasonably judge the link state of the front and back. In order to achieve the above object, the present embodiment adopts the following technical solutions. In the first step, the 0MC and the eNodeB are normally built; the transmission frequency of the retransmission queue is the initial setting value. In the second step, the 0MC sends a heartbeat packet according to the heartbeat interval frequency. After each packet is sent, the time of sending is recorded, and the packet is added to the retransmission queue corresponding to the network element. In the third step, the 0MC periodically checks the retransmission queue, sequentially sends the communication packets in the queue, and increments the number of retransmissions by one. If the number of retransmissions of a packet is 0, it indicates that the packet is a normal communication packet; if it is greater than 0, it indicates that the packet is a retransmission packet, and indicates that it is the retransmission packet of the first few times. In the fourth step, if the reply packet period of normal communication is [MIN, MAX], the transmission frequency (ie, retransmission frequency) of the retransmission packet is A=MAX. The OMC continues to send the heartbeat detection packet with the original heartbeat detection packet frequency, and transmits the retransmission packet at the transmission frequency A of the retransmission packet. In the fifth step, if the OMC—the communication reply packet of the packet is not directly received, the retransmission is fixed according to the original frequency. When the retransmission times out, the OMC prompts the chain to be broken. In the sixth step, if the OMC receives the communication reply packet of a certain packet, that is, receives the ACK packet of the sending packet, the retransmission queue is viewed. If the number of retransmissions of this packet is 0 in the retransmission queue, the packet is deleted from the retransmission queue. If the retransmission queue shows that the packet is a retransmission packet, the number of retransmissions of the packet in the retransmission queue is decremented by one. At the same time, OMC detects the time spent on this communication, and compares the time spent in this communication with the original interval. Look at the interval of several times that falls within the original interval. Then, the retransmission packet of the subsequent communication packet is linearly decremented. For example: If the time period of the normal communication reply packet is [1.0, 2.0], the reply time of the communication packet is 4.5S, which means that the shortest communication takes 1 time, the longest needs to be 2, and the floating range is 2-1= 1. If it is actually 4.5S, Bay lj 1+3*1<4.5<2+3*1, which is more than 3 times of the normal value, is 4 times of the normal value. Then, the retransmission frequency of the retransmission packet in the retransmission queue is changed to 1/4. If the time spent in this communication is in the normal range, keep the existing retransmission frequency. In the seventh step, the OMC receives the communication reply packet of the next packet, checks the elapsed time, and calculates a new retransmission frequency. If the new retransmission frequency is higher than the previous frequency, the network condition is better, but the retransmission frequency is not changed. If the new retransmission frequency is lower than the previous one, indicating that the network condition is still poor, replace the new retransmission frequency. In the ninth step, until the time when the communication reply packet received by the OMC falls within the normal interval, indicating that the network communication quality is good at this time, the retransmission frequency is replaced with the original normal frequency. The foregoing technical solution of the embodiment is: in the case that the network quality is degraded due to physical or hardware or artificial large-scale operation, the link between the OMC and the base station is poor in communication quality for a period of time, in order to avoid the time during this period Constantly broken chain reconstruction, dynamically adjust the number of retransmission packets and retransmission frequency to ensure the stability of the link. After the OMC sends a packet to the network element, it adds the packet to the retransmission queue and starts waiting for the reply packet of the packet. Heavy The transmission queue uses a certain frequency to retransmit. If the OMC can receive the reply packet within the specified time to indicate that the network is in good condition, if the time of receiving the reply packet exceeds the normal range, the frequency of the next retransmission is adjusted according to the exceeded time. The main idea of this embodiment is to control the frequency of the retransmission, and dynamically adjust the retransmission frequency according to the current network condition, so as to avoid the deterioration of the network due to retransmission in the case of a large network load. Compared with the traditional method of reducing the network load by reducing the number of heartbeat packets, the reduction of the retransmission frequency can effectively reduce the number of retransmission packets in the network, and is more effective for reducing the network load. Embodiment 2 Prerequisites of the present example: The OMC and the eNodeB are in an already established state. After the link is established, the OMC and the eNodeB rely on heartbeat detection to ensure the survival of the link. The OMC periodically starts sending heartbeat packets, and the eNodeB responds to the heartbeat packets. The OMC maintains a retransmission queue and a reception queue for each eNodeB.

Transmission Mode of OMC: FIG. 4 is a schematic diagram of a communication packet transmission process of an OMC transmission queue according to an embodiment of the present invention. As shown in FIG. 4, the process includes: Step S402: The OMC constructs a heartbeat request packet to be sent at a set heartbeat frequency. Step S404: After the OMC constructs the heartbeat request packet successfully, the OMC sends the packet. Step S406: At the same time, the OMC needs to add the heartbeat request packet to the retransmission queue, record the transmission time, and set the number of retransmissions to 0.

Receiving Mode of OMC: FIG. 5 is a schematic diagram of a receiving process of a communication packet of a receiving queue according to an embodiment of the present invention. As shown in FIG. 5, the process includes: Step S502: The OMC receives a communication packet (a reply packet) of the foreground (ie, the eNodeB). Step S504, the OMC processes the packet, determines which packet of the network element the received packet is, and adds it to the receiving queue corresponding to the network element.

Transmission Mode of OMC Retransmission Queue: FIG. 6 is a schematic flowchart of a communication packet transmission process of an OMC retransmission queue according to an embodiment of the present invention. As shown in Figure 6, the process includes: Step S602, the OMC scans the retransmission queue at the set retransmission frequency. In step S604, it is first determined whether there is a communication packet in the queue, if no communication packet is not sent. Step S606, if the retransmission queue is not empty, the communication packets in the retransmission queue are sequentially transmitted in order, and if it is empty, the process proceeds to step S610. Step S608, adding 1 to the number of retransmissions of each packet in the retransmission queue, indicating that the packet has been retransmitted. Step S610, exiting. OMC retransmission frequency adjustment mode: In most cases, the OMC and the eNodeB rely on a fixed frequency heartbeat packet to keep the link normal. Referring to FIG. 7 step S702, the OMC periodically acquires a new received data packet from the receive queue. Step S704, the OMC needs to determine whether the packet is a communication reply packet. The OMC needs to use the communication reply packet to determine the retransmission frequency that needs to be adjusted. If it is a communication reply packet, go to step S706, otherwise go to step S722. Step S706, searching for a original communication packet corresponding to the packet from the retransmission queue. In step S708, it is necessary to judge the number of retransmissions. It is judged whether the number of retransmissions of the packet is 0, that is, whether the packet is a normal communication packet or a retransmission packet. If it is a normal communication packet (the number of retransmissions is 0), the probability that the network condition is good at this time is relatively large, but it still needs to be determined according to the communication time. If the packet is retransmitted (the number of retransmissions is not 0), the probability of poor network condition is greater. It is determined whether the network condition is good according to the number of retransmissions and the time required for retransmission. Step S710: If the number of retransmissions corresponding to the packet is 0, indicating that the packet is a normal communication reply packet for the packet, the packet is deleted from the retransmission queue, and if not, the number of retransmissions is decreased by 1. In step S712, the time taken for the communication of the packet is checked, and the subsequent determination is made by this. In step S714, the time consumed by the communication is compared with the normal interval value to check whether it falls within the normal value range. If it falls within the normal interval, it can be confirmed that the communication is normal, and the network between the OMC and the eNodeB is in good condition, and no adjustment is needed. Go to step S722. Step S722, exit. Embodiment 3 When the network condition between the OMC and the eNodeB is not good, the heartbeat interval needs to be dynamically adjusted in real time according to the communication packet. If the time spent on the heartbeat indicates that the network condition is getting better, in this case, the heartbeat frequency does not need to be adjusted, and the network is adjusted to the original value after the network is completely restored. See Figure 7. Step S702, the OMC periodically extracts the data packet from the acceptance queue. In step S704, in addition to the data communication packet between the OMC and the eNodeB, there are other types of packet structures specified by the protocol, and it is necessary to determine whether it is a communication data packet. Step S706, first, the OMC needs to check the retransmission queue, and find the original communication packet corresponding to the ACK packet (communication reply packet). Step S708, it is checked whether the number of retransmissions is 0. Step S710, if the number of retransmissions is 0, indicating that it is a normal communication packet, deleting the original communication packet; if the number of retransmissions is greater than 0, indicating that the packet is a retransmission packet, the number of retransmissions is decreased by 1, and the retransmission interval needs to be further Check the network status. Step S712, it is time to view the communication reply packet. Step S714, determining whether the time consumed by the communication falls within a range of the normal value range. If yes, go to step S722, otherwise go to step S716. In most cases, the time spent falls within the normal range. When the network condition is poor, a situation larger than the normal value range will occur. Step S716, calculating the retransmission frequency: If the normal communication time range is: [A, B], the allowed deviation range value is C=BA. Assume that the time taken for this communication reply is D. If A+N*C<=D<=B+N*C, it means that the time used for this communication is N+1 times the normal value. Then the re-frequency is adjusted to 1/(N+1) of the original frequency. According to the calculation formula of the frequency of retransmission of the time consumed by the communication, the adjusted retransmission frequency is obtained. In step S718, the retransmission frequency at this time is compared with the original frequency. If the value is still greater than the retransmission frequency currently used, the network condition is improving, but the normal condition is still not restored. In this case, there is no need to adjust the retransmission frequency, and the current retransmission frequency can still be used. Step S722, exit. Example 4 In the case of a large network load, the OMC dynamically adjusts the retransmission frequency to significantly reduce the network load and restore the network to normal conditions as soon as possible. See Figure 7. Step S702, when the communication packet is received in the receiving queue, the OMC sequentially extracts each packet from the receiving queue for analysis. Step S704, the OMC first determines whether the packet is a communication reply packet or another type of data packet. Other types of data packets are handled by their respective handlers. If it is not the communication reply packet, go to step S722, otherwise go to step 706. Step S706, viewing the retransmission queue, and searching for a retransmission packet corresponding to the packet. Step S708: If the packet is a reply packet of the communication, and finds a retransmission packet corresponding to the retransmission queue, first check whether the corresponding number of retransmissions is 0. Step S710, if the number of retransmissions is not 0, indicating that the communication reply packet of the retransmission packet is used, the number of retransmissions of the packet needs to be reduced by one. Step S712, calculating the time difference between the current time and the sending time of the packet, and obtaining the time taken for the communication of the packet. In step S714, the time is compared with the normal value range to check whether it is in the normal value range. If it falls within the normal value range, it indicates that the communication between the current OMC and the eNodeB is good, and the adjustment of the transmission frequency is not required, and the process goes to step S722, otherwise the process goes to step S716. In step S716, if the time is greater than the maximum value of the normal value range, it indicates that the current communication between the OMC and the eNodeB is poor, and the frequency of the communication packet needs to be adjusted to restore the network condition. Calculation of retransmission frequency: If the normal communication time range is: [A, B], the allowable deviation range is C=BA. Assume that the time taken for this communication reply is 1). If A+N*C<=D<=B+N*C, it means that the time used for this communication is N+1 times the normal value. Then the re-frequency is adjusted to 1/(N+1) of the original frequency. Step S718, comparing the newly obtained retransmission frequency with the currently used retransmission frequency, whether it is greater than the currently used retransmission frequency. If yes, go to step S722, otherwise go to step S720. Step S720, if the calculated retransmission frequency is smaller than the currently used retransmission frequency, indicating that the current network condition is still deteriorating, and it is required to continue to reduce the retransmission frequency of the communication packet. Therefore, the new retransmission frequency is replaced by the existing retransmission frequency, and the congestion of the network communication packet is continuously reduced. Step S722, exit. In another embodiment, software is also provided for performing the technical solutions described in the above embodiments and preferred embodiments. In another embodiment, a storage medium is provided, the software being stored, including but not limited to: an optical disk, a floppy disk, a hard disk, a rewritable memory, and the like. Obviously, those skilled in the art should understand that the above modules or steps of the present invention can be implemented by a general-purpose computing device, which can be concentrated on a single computing device or distributed over a network composed of multiple computing devices. Alternatively, they may be implemented by program code executable by the computing device, such that they may be stored in the storage device by the computing device and, in some cases, may be different from the order herein. The steps shown or described are performed, or they are separately fabricated into individual integrated circuit modules, or a plurality of modules or steps are fabricated as a single integrated circuit module. Thus, the invention is not limited to any specific combination of hardware and software. The above is only the preferred embodiment of the present invention, and is not intended to limit the present invention, and various modifications and changes can be made to the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and scope of the present invention are intended to be included within the scope of the present invention.

Claims

Claim

A method for retransmitting a communication packet in a communication link layer, comprising:

Recalculating the retransmission frequency of the communication packet that needs to be retransmitted according to the elapsed time of the retransmission communication of the previous communication packet, where the elapsed time of the retransmission communication is the reply packet of the last communication packet received. The difference between the time and the time at which the last communication packet was sent;

Transmitting the communication packet that needs to be retransmitted according to the calculated retransmission frequency.

The method according to claim 1, wherein, before calculating the retransmission frequency of the communication packet that needs to be retransmitted according to the elapsed time of the communication packet retransmission of the previous communication packet, the method further includes:

The time taken to determine the retransmission communication exceeds a predetermined threshold.

3. The method according to claim 1, further comprising:

Determining whether the calculated retransmission frequency is higher than a retransmission frequency of the last retransmission communication; if yes, performing the retransmission communication according to the retransmission frequency of the last retransmission communication; if not, following The calculated retransmission frequency is used for the current retransmission communication.

The transmitted communication packet is recorded in a retransmission queue and the number of retransmissions of the transmitted communication packet is marked.

5. The method according to claim 4, further comprising:

Marking the number of retransmissions of the first transmitted communication packet as 0;

The number of retransmissions of the first transmitted communication is incremented by one if the reply packet of the first transmitted communication packet is not received within a predetermined period of time.

The method according to claim 4, further comprising: determining that the communication link is broken when the number of retransmissions reaches a preset threshold.

The method according to claim 4, wherein, after the communication packet that needs to be retransmitted is transmitted according to the calculated retransmission frequency, the method further includes:

The communication packets in the retransmission queue are periodically checked, and the communication packets in the retransmission queue are sequentially transmitted.

8. A retransmission device for a communication packet in a communication link layer, comprising: a calculation module, configured to calculate a retransmission frequency of the communication packet that needs to be retransmitted according to the elapsed time of the retransmission communication of the previous communication packet, where the elapsed time of the retransmission communication is the receipt of the previous communication The difference between the time of replying the packet and the time of transmitting the last communication packet;

And a retransmission module, configured to transmit the communication packet that needs to be retransmitted according to the calculated retransmission frequency. The apparatus of claim 8, further comprising: a determining module configured to determine that the elapsed time of the retransmission communication exceeds a predetermined threshold. The apparatus according to claim 8, further comprising: a determining module, configured to determine whether the calculated retransmission frequency is higher than a retransmission frequency of the last retransmission communication; if yes, notify the weight The transmitting module performs the retransmission communication according to the retransmission frequency of the last retransmission communication; if not, notifying the retransmission module to perform the retransmission communication according to the calculated retransmission frequency.