CN107733589B - Method, device, equipment and storage medium for realizing automatic retransmission request of ad hoc network - Google Patents
Method, device, equipment and storage medium for realizing automatic retransmission request of ad hoc network Download PDFInfo
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L1/00—Arrangements for detecting or preventing errors in the information received
- H04L1/12—Arrangements for detecting or preventing errors in the information received by using return channel
- H04L1/16—Arrangements for detecting or preventing errors in the information received by using return channel in which the return channel carries supervisory signals, e.g. repetition request signals
- H04L1/18—Automatic repetition systems, e.g. Van Duuren systems
- H04L1/1829—Arrangements specially adapted for the receiver end
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L1/00—Arrangements for detecting or preventing errors in the information received
- H04L1/12—Arrangements for detecting or preventing errors in the information received by using return channel
- H04L1/16—Arrangements for detecting or preventing errors in the information received by using return channel in which the return channel carries supervisory signals, e.g. repetition request signals
- H04L1/1607—Details of the supervisory signal
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L1/00—Arrangements for detecting or preventing errors in the information received
- H04L1/12—Arrangements for detecting or preventing errors in the information received by using return channel
- H04L1/16—Arrangements for detecting or preventing errors in the information received by using return channel in which the return channel carries supervisory signals, e.g. repetition request signals
- H04L1/18—Automatic repetition systems, e.g. Van Duuren systems
- H04L1/1829—Arrangements specially adapted for the receiver end
- H04L1/1864—ARQ related signaling
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- H—ELECTRICITY
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- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W4/00—Services specially adapted for wireless communication networks; Facilities therefor
- H04W4/06—Selective distribution of broadcast services, e.g. multimedia broadcast multicast service [MBMS]; Services to user groups; One-way selective calling services
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
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Abstract
The embodiment of the invention discloses a method, a device, equipment and a storage medium for realizing an automatic retransmission request of an ad hoc network. The method comprises the following steps: a receiving node receives first information which is sent by a sending node in a network and points to the receiving node; if the number of the received first information sent by the same sending node reaches a preset number value, broadcasting first receiving state feedback information when the next sending time slot arrives, so that each sending node adjusts the information sending mode of each next sending time slot according to the first receiving state feedback information; the first receiving state feedback information includes feedback information of the receiving state of the first information sent by the receiving node to each sending node. The method for realizing the automatic retransmission request of the ad hoc network can be suitable for the wireless ad hoc network, improves the transmission efficiency of each node, ensures the quality of wireless communication among the nodes, and improves the communication reliability among the nodes.
Description
Technical Field
The embodiment of the invention relates to the technical field of communication, in particular to a method, a device, equipment and a storage medium for realizing an automatic repeat request of an ad hoc network.
Background
A wireless Ad-Hoc Network (Mobile Ad-Hoc Network) refers to a multi-hop mobility peer-to-peer Network composed of dozens to hundreds of nodes, using a wireless communication mode and dynamically networking, which is referred to as a wireless Ad-Hoc Network for short, and aims to transmit a multimedia information stream with a service quality requirement through a dynamic routing and mobility management technology. The wireless ad hoc network does not need the support of fixed equipment, each node, namely the user terminal, is networked by itself, and when in communication, other user nodes forward data. The network form breaks through the geographical limitation of the traditional wireless cellular network, can be deployed more quickly, conveniently and efficiently, and is suitable for the communication needs of some emergency occasions, such as individual soldier communication systems in battlefields.
Automatic Repeat-Request (ARQ) is one of error correction protocols of a data link layer in an OSI (Open System Interconnection) model. Recovering an erroneous data message by requesting a sender from a receiver to retransmit the erroneous data message is one of methods for handling errors introduced by a channel in communication, and is sometimes referred to as backward error correction. Conventional automatic Repeat requests are classified into three types, namely Stop-and-Wait ARQ, Go-Back-N ARQ, and Selective Repeat ARQ. The difference between the three protocols is that the processing mechanisms for the erroneous data messages are different, the complexity of the three ARQ protocols is increased, and the efficiency is also increased. No matter which ARQ method is adopted alone, the requirement for automatic retransmission in a wireless ad hoc network system cannot be met.
Disclosure of Invention
The embodiment of the invention provides a method, a device, equipment and a storage medium for realizing an automatic retransmission request of an ad hoc network, which are used for optimizing the existing method for realizing the automatic retransmission request, providing a method for realizing the automatic retransmission request suitable for a wireless ad hoc network system and ensuring the communication quality and the communication reliability among nodes in the wireless ad hoc network.
In a first aspect, an embodiment of the present invention provides a method for implementing an ad hoc network automatic repeat request, including:
a receiving node receives first information sent by a sending node in a network, wherein the first information points to the receiving node;
if the receiving node determines that the number of the received first information sent by the same sending node reaches a preset number value, broadcasting first receiving state feedback information to the network when the next sending time slot arrives, so that each sending node adjusts the information sending mode of the respective next sending time slot according to the first receiving state feedback information;
the first receiving state feedback information includes feedback information of a receiving state of the first information sent by the receiving node to each sending node.
In a second aspect, an embodiment of the present invention further provides a method for implementing an ad hoc network automatic repeat request, including:
a sending node sends first information to a receiving node in a network and stores the first information, wherein the first information points to the corresponding receiving node;
the sending node receives first receiving state feedback information sent by a target receiving node, wherein the first receiving state feedback information comprises feedback information of receiving states of information sent by the target receiving node to the sending nodes;
and the sending node adjusts the information sending mode of the next sending time slot of the sending node according to the feedback information of the receiving state of the first information sent by the sending node from the target receiving node in the first receiving state feedback information.
In a third aspect, an embodiment of the present invention further provides an apparatus for implementing an ad hoc network automatic repeat request, which is applied to a receiving node, and includes:
the information receiving module is used for receiving first information sent by a sending node in a network where the first information is located, and the first information points to the receiving node;
a feedback information sending module, configured to broadcast first receiving state feedback information to the network when a next sending time slot arrives if it is determined that the number of the received first information sent by the same sending node reaches a preset number value, so that each sending node adjusts an information sending mode of each next sending time slot according to the first receiving state feedback information;
the first receiving state feedback information includes feedback information of a receiving state of the first information sent by the receiving node to each sending node.
In a fourth aspect, an embodiment of the present invention further provides an apparatus for implementing an ad hoc network automatic repeat request, which is applied to a sending node, and includes:
the information sending module is used for sending first information to a receiving node in a network and storing the first information, wherein the first information points to the corresponding receiving node;
a feedback information receiving module, configured to receive first receiving state feedback information sent by a target receiving node, where the first receiving state feedback information includes feedback information of receiving states of information sent by the target receiving node to each sending node;
and a sending mode adjusting module, configured to adjust an information sending mode of a next sending time slot of the sending node according to the feedback information of the receiving state of the first information sent by the sending node from the target receiving node in the first receiving state feedback information.
In a fifth aspect, an embodiment of the present invention further provides a computer device, including a memory, a processor, and a computer program stored in the memory and executable on the processor, where the processor implements the method for implementing an ad hoc network automatic repeat request applied to a receiving node when executing the program.
In a sixth aspect, the embodiment of the present invention further provides a computer-readable storage medium, on which a computer program is stored, where the computer program, when executed by a processor, implements the implementation method of the ad hoc network automatic repeat request applied to a receiving node according to the embodiment of the present invention.
In a seventh aspect, an embodiment of the present invention further provides a computer device, including a memory, a processor, and a computer program stored in the memory and executable on the processor, where the processor implements the method for implementing an ad hoc network automatic repeat request applied to a sending node when executing the program.
In an eighth aspect, an embodiment of the present invention further provides a computer-readable storage medium, on which a computer program is stored, where the computer program, when executed by a processor, implements the method for implementing an ad hoc network automatic repeat request applied to a sending node according to the embodiment of the present invention.
According to the method, the device, the equipment and the storage medium for realizing the automatic retransmission request of the ad hoc network, the receiving node receives the first information which is sent by the sending node in the network and points to the receiving node, if the number of the received first information sent by the same sending node reaches the preset number value, the first receiving state feedback information is broadcasted to the network when the next sending time slot arrives, so that each sending node adjusts the information sending mode of the respective next sending time slot according to the first receiving state feedback information.
Drawings
Fig. 1 is a flowchart of an implementation method for automatic repeat request of an ad hoc network according to an embodiment of the present invention;
fig. 2 is a flowchart of a method for implementing an ad hoc network automatic repeat request according to a second embodiment of the present invention;
fig. 3 is a flowchart of an apparatus for implementing an ad hoc network automatic repeat request according to a fourth embodiment of the present invention;
fig. 4 is a flowchart of an apparatus for implementing an ad hoc network automatic repeat request according to a fifth embodiment of the present invention;
fig. 5 is a schematic structural diagram of a computer device according to a sixth embodiment of the present invention.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings and examples. It is to be understood that the specific embodiments described herein are merely illustrative of the invention and are not limiting of the invention. It should be further noted that, for the convenience of description, only some of the structures related to the present invention are shown in the drawings, not all of the structures.
It should be further noted that, for the convenience of description, only some but not all of the relevant aspects of the present invention are shown in the drawings. Before discussing exemplary embodiments in more detail, it should be noted that some exemplary embodiments are described as processes or methods depicted as flowcharts. Although a flowchart may describe the operations (or steps) as a sequential process, many of the operations can be performed in parallel, concurrently or simultaneously. In addition, the order of the operations may be re-arranged. The process may be terminated when its operations are completed, but may have additional steps not included in the figure. The processes may correspond to methods, functions, procedures, subroutines, and the like.
Example one
Fig. 1 is a flowchart of a method for implementing an ad hoc network automatic retransmission request according to an embodiment of the present invention, where this embodiment is applicable to a situation where a receiving node requests a sending node to retransmit an erroneous data packet to recover an error packet in a wireless ad hoc network, and the method may be implemented by an apparatus for implementing an ad hoc network automatic retransmission request applied to a receiving node according to an embodiment of the present invention, where the apparatus may be implemented in a software and/or hardware manner and may be generally integrated in a mobile terminal, and the method of this embodiment specifically includes the following steps:
s110, receiving the first information sent by the sending node in the network where the receiving node is located. Wherein the first information is directed to the receiving node.
Wherein the network may be a wireless ad hoc network formed by the receiving node and the transmitting node.
In a wireless ad hoc network, each node can transmit information or receive information, for each piece of information, a transmitter of the information is called a transmitting node, and a receiver of the information is called a receiving node. The receiving node receives first information which is sent by other sending nodes and points to the receiving node.
And S120, if the receiving node determines that the number of the received first messages sent by the same sending node reaches a preset number value, broadcasting first receiving state feedback information to the network when a next sending time slot arrives, so that each sending node adjusts the information sending mode of each next sending time slot according to the first receiving state feedback information.
The first receiving state feedback information includes feedback information of a receiving state of the first information sent by the receiving node to each sending node, and the feedback information is, for example, ACK (Acknowledgement character) or NACK (Negative Acknowledgement character).
The first receiving state feedback information is sent by the receiving node for all the sending nodes sending the first information to the receiving node, wherein the first receiving state feedback information includes the feedback information of the receiving states of all the first information sent by the sending nodes and pointing to the receiving node.
The receiving node judges whether the number of the first information sent by the same sending node reaches a preset number value, the preset number value is determined by time slot allocation and the number of nodes according to an average allocation rule, and specifically, the preset number value meets the following requirements: and N is INT (Q/A +1), N is the preset quantity value, Q is the number of time slots in a complex frame, A is the total number of nodes in the wireless ad hoc network, and INT is an integer function.
When the number of the first information which is sent by one sending node and points to the receiving node reaches a preset number value, the receiving node broadcasts feedback information of the receiving state of the first information sent by each node to the wireless ad hoc network when the next sending time slot arrives, so that each sending node knows the state of each sending information, namely whether the sending information is successfully received by the receiving node or not, the information sending mode of each next sending time slot is adjusted, namely, the first information which is not successfully received by the resending receiving node or the sending mode of the sending node normally runs, and the information is sent according to the transmission requirement.
And if the receiving node determines that the number of the first information sent by any sending node reaches the preset number value before the next sending time slot arrives, the receiving node sends the information according to a normal sending mode when the next sending time slot arrives.
In an optional implementation manner of this embodiment, the receiving node may broadcast the first reception state feedback information when a next fixed time slot pre-allocated to the node arrives.
And dividing the time slot in each multiframe into a fixed time slot and a dynamic time slot, wherein the fixed time slot is fixedly distributed to each node, and the dynamic time slot is dynamically distributed according to the transmission requirement of each node.
That is, the first reception state feedback information broadcast by the receiving node is transmitted in a fixed time slot allocated in advance. For example, the receiving node determines that the number of the received first information sent by the same sending node reaches a preset number value in the current multiframe, and if the fixed time slot pre-allocated to the receiving node does not arrive, the receiving node broadcasts first receiving state feedback information when the fixed time slot pre-allocated to the receiving node in the current multiframe arrives; if the fixed time slot pre-allocated to the receiving node has passed, the receiving node broadcasts the first receiving state feedback information when the fixed time slot pre-allocated to the receiving node in the next multiframe arrives.
In another optional implementation manner of this embodiment, the receiving node may also broadcast the first receiving state feedback information when a next dynamic time slot pre-allocated to the node arrives. That is, the first reception state feedback information broadcasted by the receiving node is transmitted in a dynamic slot previously allocated thereto. For example, if the receiving node determines that the number of the received first messages sent by the same sending node reaches a preset number value in the current multiframe, the receiving node generates a requirement for transmitting the messages, and broadcasts the first state feedback message when the dynamic time slot allocated to the receiving node arrives.
In the technical scheme, when the receiving node determines that the number of the received first messages sent by the same sending node reaches a preset number value, the receiving node sends the first state feedback message by using the next sending time slot, and can timely feed back the receiving state of the received messages to the sending node, so that the sending node can timely adjust the message sending mode of the respective next sending time slot, and the message interaction efficiency among the nodes in the network is improved.
In the method for implementing an ad hoc network automatic retransmission request provided in this embodiment, a receiving node receives first information, which is sent by a sending node in a network where the receiving node is located and points to the receiving node, and if it is determined that the number of the received first information sent by the same sending node reaches a preset number value, when a next sending time slot arrives, first receiving state feedback information is broadcasted to the network, so that each sending node adjusts an information sending mode of each next sending time slot according to the first receiving state feedback information.
According to the average distribution rule, a preset quantity value is designed, and the receiving node broadcasts first receiving state feedback information to the network when determining that the number of the received first information sent by the same sending node reaches the preset quantity value. If the interval time for the receiving node to send the first receiving state feedback information is too short, too many network resources are occupied due to frequent sending of the first receiving state feedback information, and normal information interaction among the nodes is influenced; if the interval time for the receiving node to send the first receiving state feedback information is too long, data delay may be caused due to the delayed feedback of the information receiving state, and even system transmission errors may be caused. In summary, the preset quantity value is designed, so that the receiving node can be prevented from influencing normal information interaction with other nodes due to the fact that the receiving node sends and receives the state feedback information, the transmission efficiency of each node is improved, and the communication quality and reliability between the nodes are also ensured.
Example two
Fig. 2 is a flowchart of a method for implementing an ad hoc network automatic retransmission request according to a second embodiment of the present invention, where this embodiment is applicable to a situation where a receiving node requests a sending node to retransmit an erroneous data packet to recover an error packet in a wireless ad hoc network, and the method may be implemented by an apparatus for implementing an ad hoc network automatic retransmission request applied to a sending node according to the second embodiment of the present invention, where the apparatus may be implemented in a software and/or hardware manner and may be generally integrated in a mobile terminal, and the method of this embodiment specifically includes the following steps:
s210, a sending node sends first information to a receiving node in the network and stores the first information. Wherein the first information points to a corresponding receiving node.
Specifically, the network is a wireless ad hoc network formed by the transmitting node and the receiving node.
The sending node in the wireless ad hoc network can send first information pointing to any other node, and stores the first information, aiming at retransmitting the first information pointing to the corresponding receiving node if the feedback information of the receiving state of the corresponding receiving node to the first information is NACK.
S220, the sending node receives first receiving state feedback information sent by a target receiving node. The first receiving state feedback information includes feedback information of receiving states of information sent by the target receiving node to the sending nodes.
The sending node receives first receiving state feedback information sent by a target receiving node so as to obtain feedback information of a receiving state of the first information which is sent by the sending node and points to the target receiving node.
The first receiving state feedback information is sent by the target receiving node for all the sending nodes sending the first information to the target receiving node, wherein the first receiving state feedback information includes the feedback information of the receiving states of all the first information sent by the sending nodes and pointing to the target receiving node.
S230, the sending node adjusts an information sending mode of a next sending time slot of the sending node according to the feedback information of the receiving state of the first information sent by the sending node from the target receiving node in the first receiving state feedback information.
The sending node adjusts the information sending mode of the next sending time slot according to the feedback state (for example, ACK or NACK) of each first information in the first receiving state feedback information, whether the first information which is not successfully received by the target receiving node is retransmitted or the sending mode of the sending node normally operates, and sends the information according to the transmission requirement.
In an optional implementation manner of this embodiment, if the sending node determines, according to the first reception feedback information, that the reception state of the target receiving node for the first information is correct for receiving confirmation (that is, the feedback state of the first information is ACK), the sending node discards the first information, and sends information according to a normal sending mode when a next sending slot arrives;
and if the transmitting node determines that the receiving state of the target receiving node for the first information is that the receiving is determined to be wrong (namely the feedback state of the first information is NACK) according to the first receiving feedback information, the transmitting node retransmits the first information to the target receiving node when the next transmitting time slot arrives.
Specifically, when the next fixed time slot pre-allocated to the sending node and/or the dynamic time slot allocated in real time arrives, the sending node resends the first information to the target receiving node.
That is, the first information retransmitted by the transmitting node to the target receiving node may be a fixed time slot previously allocated to the transmitting node next to the first information, or may be retransmitted when a dynamic time slot dynamically allocated in real time according to a transmission requirement of each transmitting node arrives.
On the basis of the foregoing embodiments, after the transmitting node retransmits the first information to the target receiving node when the next transmission slot arrives, if it is determined that the cumulative number of times of retransmitting the first information to the target receiving node reaches two or three times, the transmitting node stops retransmitting the first information, and discards the first information.
That is, for the first information whose information feedback state is NACK, after the sending node retransmits the first information two to three times, the receiving node receives the feedback information state or NACK, and it is determined that the first information cannot be successfully received by the target receiving node, and the information is not repeatedly transmitted.
In the method for implementing an ad hoc network automatic repeat request provided by this embodiment, a sending node sends first information to a receiving node in a network where the sending node is located, and the first information is stored; receiving first receiving state feedback information which is sent by a target receiving node and comprises feedback information of receiving states of information sent by the target receiving node to all sending nodes; according to the technical scheme that the feedback information of the receiving state of the first information sent by the sending node is adjusted by the target receiving node according to the feedback information of the receiving state of the first information in the first receiving state feedback information, and the information sending mode of the next sending time slot is adjusted, the automatic retransmission method suitable for the wireless ad hoc network system is provided, the transmission efficiency of each node is improved, meanwhile, the quality of wireless communication among the nodes is guaranteed, and the communication reliability among the nodes is also improved.
On the basis of the foregoing embodiments, if the sending node determines that the first receiving state feedback information sent by the target receiving node is not received within a set threshold number of multiframes, the first information of the feedback information in the receiving state is sent to the target receiving node again after the threshold number of multiframes is set.
Wherein the set threshold satisfies: m > T, wherein M is the set threshold, and T satisfies: t ═ INT [ (a-1) × (N-1) × a/Q ], a being a total number of nodes in the wireless ad hoc network, Q being a number of time slots in one complex frame, INT being an integer function, N being a maximum transmission number of information transmitted by the transmitting node, satisfying: N-INT (Q/a + 1).
If the sending node determines that the first receiving state feedback information sent by the target receiving node is not received within the set threshold number of multiframes, the first receiving state feedback information sent by the target receiving node is considered to be lost, so that the sending node can send the first information of the feedback information of the non-receiving state to the target receiving node again after setting the threshold number of multiframes.
In the above technical solution, the setting of the threshold is significant in avoiding a phenomenon that the sending node erroneously triggers retransmission in order to avoid that the first receiving state feedback information is not sent at the target receiving node. For example, the sending node sends the first information to the target receiving node during the first multiframe, and when the first receiving state feedback information sent by the target receiving node is not received yet when the third multiframe arrives, the sending node considers that the first receiving state feedback information is lost, and sends the first information that the receiving state feedback information is not received to the target receiving node again. Meanwhile, the target receiving node does not actually send the receiving state feedback information of the first information, that is, the sending node retransmits the first information by mistake, so that the target receiving node repeatedly receives the information. Therefore, the setting of the threshold can improve the stability and reliability of the system and reduce the retransmission error rate.
EXAMPLE III
On the basis of the above embodiments, the present embodiment will provide a specific embodiment. Wherein, the total number of nodes in the wireless ad hoc network is assumed to be 4, which are node 1, node 2, node 3 and node 4. The specific implementation allocation scheme is as follows: one multiframe comprises four fixed time slots and four dynamic time slots, wherein the fixed time slot 1 is allocated as a node 1 sending time slot, the fixed time slot 2 is allocated with a node 2 sending time slot, the fixed time slot 3 is allocated with a node 3 sending time slot, and the fixed time slot 4 is allocated with a node 4 sending time slot; the dynamic time slots are dynamically allocated according to the transmission requirements of each node.
It should be noted that the number of timeslots in a multiframe can be set according to the actual situation, and is usually 2nThe number of the fixed time slots and the dynamic time slots in each multiframe can also be set according to the actual situation, the number of the fixed time slots allocated to each node can be one or more, and the invention does not specifically limit the number of the fixed time slots and the dynamic time slots.
Taking node 2 as an example, a method for implementing the above ad hoc network automatic repeat request is described, where the information transmission condition in the wireless ad hoc network is shown in table 1, table 2, and table 3, where iTjR in the table indicates information transmitted by the ith node and received by the jth node.
TABLE 1 schematic time slot allocation for multiframes
Table 2 received information statistics for node 2
Table 3 reception state feedback information of node 2
| 1 | 2 | 3 | |
| 1T2R | NACK | ACK | NACK |
| 2T2R | |||
| 3T2R | ACK | ||
| 4T2R |
As can be seen from the formula N — INT (Q/a +1), the preset number value N is 3, that is, the maximum number of messages sent from each sending node to the receiving node is 3.
As shown in table 2, when the node 2 receives the information sent by the node 1, the number of the information is three at first, and the node 2 also receives one information sent by the node 3, the node 2 broadcasts the reception status feedback information when its next fixed transmission time slot arrives. It should be noted that as long as the number of information sent to the node 2 by one node reaches 3, the node 2 will perform statistics again on the number of information received by the node, and the receiving state feedback information broadcasted by the node includes feedback information of receiving states of all information sent by the nodes.
Specifically, referring to table 1 (the numbers in the first column of table 1 indicate the sequence numbers of the multiframes), in the first multiframe, node 1 sends three pieces of information to node 2 when its fixed time slot 1 and two of the dynamic time slots arrive, namely 1T2R (1), 1T2R (2), and 1T2R (3) in the first multiframe in table 1; node 3 sends a message, 3T2R, to node 2 when its fixed time slot 3 arrives. Besides, in the first multiframe, information interaction among other nodes is realized.
When the next fixed transmission time slot of the node 2 arrives, that is, when the fixed time slot 2 of the second multiframe arrives, the node 2 broadcasts the reception status feedback information in the wireless ad hoc network, which is detailed in table 3, that is, the reception status of the first information and the third information sent by the node 1 received by the node 2 is NACK, and the reception status of the second information sent by the node 1 received and the reception status of the information sent by the node 3 received are ACK.
If the node 1 receives the receiving status feedback information broadcasted by the node 2 and knows that the receiving status of the first information and the third information is NACK, the first information and the third information are retransmitted when the next transmission slot arrives, and the retransmission can be performed in the fixed slot 1 or the dynamic slot, as exemplified in table 1, the retransmission is performed in the dynamic slot, that is, 1T2R (1) and 1T2R (3) transmitted in the first multiframe dynamic slot; knowing that the reception status of the second information is ACK, the second information is discarded, and new information is sent when the next transmission slot arrives, and may be sent in its fixed slot 1 or dynamic slot, as exemplified in table 1 by sending new information in its fixed slot 1, i.e. 1T2R (new) in the fixed slot 1 of the third multiframe.
If the node 3 receives the receiving state feedback information broadcasted by the node 2 and knows that the receiving state of the information sent to the node 2 is ACK, the information is discarded, new information is sent when the next sending time slot comes, and the new information can be sent in the fixed time slot 3 or in the dynamic time slot.
As can be seen from the formula M > T for setting the threshold, when T is 3, M can be 4 as calculated from INT [ (a-1) × (N-1) × a/Q ].
If the node 1 determines that the reception state feedback information broadcasted by the node 2 is not received within 4 multiframes, it is determined that the reception state feedback information transmitted by the node 2 is lost, and therefore, the node 1 retransmits three pieces of information of the feedback information of the non-reception state, i.e., 1T2R (1), 1T2R (2) and 1T2R (3) retransmitted in the fixed time slot 1 and the dynamic time slot in the fifth multiframe in table 1, to the node 2 after 4 multiframes.
Example four
Fig. 3 is a schematic structural diagram of an apparatus for implementing an ad hoc network automatic retransmission request according to a fourth embodiment of the present invention, which is applicable to a situation in which a receiving node in a wireless ad hoc network requests a sending node to retransmit an erroneous data packet so as to recover the erroneous data packet, and is applied to the receiving node, where the apparatus may be implemented in a software and/or hardware manner, and may be generally integrated in a mobile terminal, as shown in fig. 3, and the apparatus includes: an information receiving module 310 and a feedback information transmitting module 320. Wherein the content of the first and second substances,
an information receiving module 310, configured to receive first information sent by a sending node in a network where the sending node is located, where the first information points to the receiving node;
a feedback information sending module 320, configured to broadcast first receiving status feedback information to the network when a next sending timeslot arrives if it is determined that the number of the received first information sent by the same sending node reaches a preset number value, so that each sending node adjusts an information sending mode of a respective next sending timeslot according to the first receiving status feedback information.
The first receiving state feedback information includes feedback information of a receiving state of the first information sent by the receiving node to each sending node.
The embodiment provides a device for realizing an automatic retransmission request of an ad hoc network, wherein a receiving node receives first information which is sent by a sending node in a network where the receiving node is located and points to the receiving node, if the number of the received first information sent by the same sending node reaches a preset number value, when a next sending time slot arrives, first receiving state feedback information is broadcasted to the network, so that each sending node adjusts an information sending mode of each next sending time slot according to the first receiving state feedback information.
Specifically, the network is a wireless ad hoc network formed by the receiving node and the transmitting node.
The preset quantity value satisfies the following conditions: and N is INT (Q/a +1), where N is the preset number value, Q is the number of timeslots in one complex frame, a is the total number of nodes in the wireless ad hoc network, and INT is an integer function.
In an optional implementation manner of this embodiment, the feedback information sending module 320 is specifically configured to broadcast the first receiving state feedback information when a next fixed time slot pre-allocated to the receiving node arrives or when a next dynamic time slot pre-allocated to the receiving node arrives.
On the basis of the foregoing embodiments, the apparatus for implementing an ad hoc network automatic repeat request further includes:
and the common information sending module is used for sending the information according to a normal sending mode when the next sending time slot reaches, if the number of the first information sent by any sending node is determined to reach the preset number value before the next sending time slot reaches.
The device for realizing the automatic retransmission request of the ad hoc network can execute the method for realizing the automatic retransmission request of the ad hoc network applied to the receiving node provided by any embodiment of the invention, and has the corresponding functional modules and the beneficial effects of the method for realizing the automatic retransmission request of the ad hoc network applied to the receiving node.
EXAMPLE five
Fig. 4 is a schematic structural diagram of an apparatus for implementing an ad hoc network automatic retransmission request according to a fifth embodiment of the present invention, which is applicable to a situation where a receiving node in a wireless ad hoc network requests a sending node to retransmit an erroneous data packet so as to recover the erroneous data packet, and is applied to the sending node, where the apparatus may be implemented in a software and/or hardware manner, and may be generally integrated in a mobile terminal, as shown in fig. 4, the apparatus includes: an information transmitting module 410, a feedback information receiving module 420, and a transmission mode adjusting module 430. Wherein the content of the first and second substances,
the information sending module 410 is configured to send first information to a receiving node in the network, and store the first information. Wherein the first information points to a corresponding receiving node;
a feedback information receiving module 420, configured to receive first receiving state feedback information sent by a target receiving node, where the first receiving state feedback information includes feedback information of receiving states of information sent by the target receiving node to each sending node;
a sending mode adjusting module 430, configured to adjust an information sending mode of a next sending time slot of the sending node according to the feedback information of the receiving state of the first information sent by the sending node from the target receiving node in the first receiving state feedback information.
In the implementation apparatus for an ad hoc network automatic repeat request provided by this embodiment, a sending node sends first information to a receiving node in a network where the sending node is located, and stores the first information; receiving first receiving state feedback information which is sent by a target receiving node and comprises feedback information of receiving states of information sent by the target receiving node to all sending nodes; according to the technical scheme that the feedback information of the receiving state of the first information sent by the sending node is adjusted by the target receiving node according to the feedback information of the receiving state of the first information in the first receiving state feedback information, and the information sending mode of the next sending time slot is adjusted, the automatic retransmission method suitable for the wireless ad hoc network system is provided, the transmission efficiency of each node is improved, meanwhile, the quality of wireless communication among the nodes is guaranteed, and the communication reliability among the nodes is also improved.
Specifically, the network is a wireless ad hoc network formed by the transmitting node and the receiving node.
In an optional implementation manner of this embodiment, the sending mode adjusting module 430 may include: normal transmission information units and retransmission information units. Wherein the content of the first and second substances,
a normal sending information unit, configured to discard the first information if it is determined that the receiving state of the target receiving node for the first information is correct for receiving according to the first receiving feedback information, and send the information according to a normal sending mode when a next sending time slot arrives;
and a resending information unit, configured to resend the first information to the target receiving node when a next sending time slot arrives if it is determined that the receiving state of the target receiving node for the first information is that reception is erroneously acknowledged according to the first reception feedback information.
Specifically, the resending information unit is specifically configured to resend the first information to the target receiving node when a next fixed time slot pre-allocated to the sending node and/or a dynamic time slot allocated in real time arrives.
On the basis of the foregoing embodiments, the sending mode adjusting module 430 may further include: and a retransmission stop information unit, configured to stop retransmitting the first information and discard the first information if it is determined that the cumulative number of times of retransmitting the first information to the target receiving node reaches two or three times after retransmitting the first information to the target receiving node when a next transmission slot arrives.
On the basis of the foregoing embodiments, the apparatus for implementing an ad hoc network automatic repeat request may further include:
and an information retransmission module, configured to, if it is determined that the first receiving state feedback information sent by the target receiving node is not received within a set threshold number of multiframes, resend the first information of the feedback information in the non-receiving state to the target receiving node after the set threshold number of multiframes.
Specifically, the set threshold satisfies: m > T, wherein M is the set threshold, and T satisfies: t ═ INT [ (a-1) × (N-1) × a/Q ], a being a total number of nodes in the wireless ad hoc network, Q being a number of time slots in one complex frame, INT being an integer function, N being a maximum transmission number of information transmitted by the transmitting node, satisfying: N-INT (Q/a + 1).
The device for realizing the automatic retransmission request of the ad hoc network can execute the method for realizing the automatic retransmission request of the ad hoc network applied to the sending node provided by any embodiment of the invention, and has the corresponding functional modules and the beneficial effects of the method for realizing the automatic retransmission request of the ad hoc network applied to the sending node.
EXAMPLE six
As shown in fig. 5, a schematic structural diagram of a computer device according to a sixth embodiment of the present invention is shown in fig. 5, where the computer device includes:
one or more processors 510, one processor 510 being illustrated in FIG. 5;
a memory 520;
the computer device may further include: an input device 530 and an output device 540.
The processor 510, the memory 520, the input device 530 and the output device 540 of the computer apparatus may be connected by a bus or other means, and fig. 5 illustrates the connection by a bus as an example.
The memory 520 is a non-transitory computer-readable storage medium and may be used to store software programs, computer-executable programs, and modules, such as program instructions/modules corresponding to an implementation method of an ad-hoc network automatic repeat request applied to a receiving node or an implementation method of an ad-hoc network automatic repeat request applied to a sending node in the embodiment of the present invention (for example, the motion information receiving module 310 and the feedback information sending module 320 shown in fig. 3, or the information sending module 410, the feedback information receiving module 420, and the sending mode adjusting module 430 shown in fig. 4). The processor 510 executes various functional applications and data processing of the computer by running software programs, instructions and modules stored in the memory 520, namely, implementing an implementation method of the foregoing embodiments, which is applied to an ad hoc network automatic repeat request of a receiving node, or an implementation method of an ad hoc network automatic repeat request of a sending node.
The memory 520 may include a storage program area and a storage data area, wherein the storage program area may store an operating system, an application program required for at least one function; the storage data area may store data created according to use of the computer device, and the like. Further, the memory 520 may include high speed random access memory, and may also include non-transitory memory, such as at least one magnetic disk storage device, flash memory device, or other non-transitory solid state storage device. In some embodiments, memory 520 may optionally include memory located remotely from processor 510, which may be connected to a terminal device via a network. Examples of such networks include, but are not limited to, the internet, intranets, local area networks, mobile communication networks, and combinations thereof.
The input device 530 may be used to receive input numeric or character information and generate key signal inputs related to user settings and function control of the computer apparatus. The output device 540 may include a display device such as a display screen.
EXAMPLE seven
Embodiments of the present invention further provide a storage medium containing computer-executable instructions, which when executed by a computer processor, are configured to perform a method for implementing an ad hoc network automatic repeat request applied to a receiving node, where the method includes:
a receiving node receives first information sent by a sending node in a network, wherein the first information points to the receiving node;
if the receiving node determines that the number of the received first information sent by the same sending node reaches a preset number value, broadcasting first receiving state feedback information to the network when the next sending time slot arrives, so that each sending node adjusts the information sending mode of the respective next sending time slot according to the first receiving state feedback information;
the first receiving state feedback information includes feedback information of a receiving state of the first information sent by the receiving node to each sending node.
Or, a method for implementing an ad hoc network automatic repeat request applied to a sending node is executed, and the method comprises the following steps:
a sending node sends first information to a receiving node in a network and stores the first information, wherein the first information points to the corresponding receiving node;
the sending node receives first receiving state feedback information sent by a target receiving node, wherein the first receiving state feedback information comprises feedback information of receiving states of information sent by the target receiving node to the sending nodes;
and the sending node adjusts the information sending mode of the next sending time slot of the sending node according to the feedback information of the receiving state of the first information sent by the sending node from the target receiving node in the first receiving state feedback information.
Optionally, the computer executable instruction, when executed by a computer processor, may be further configured to execute a technical solution of an implementation method applied to an ad hoc network automatic repeat request of a receiving node or an implementation method applied to an ad hoc network automatic repeat request of a sending node according to any embodiment of the present invention.
From the above description of the embodiments, it is obvious for those skilled in the art that the present invention can be implemented by software and necessary general hardware, and certainly, can also be implemented by hardware, but the former is a better embodiment in many cases. Based on such understanding, the technical solutions of the present invention may be embodied in the form of a software product, which can be stored in a computer-readable storage medium, such as a floppy disk, a Read-Only Memory (ROM), a Random Access Memory (RAM), a FLASH Memory (FLASH), a hard disk or an optical disk of a computer, and includes several instructions for enabling a computer device (which may be a personal computer, a server, or a network device) to execute the methods according to the embodiments of the present invention.
It is to be noted that the foregoing is only illustrative of the preferred embodiments of the present invention and the technical principles employed. It will be understood by those skilled in the art that the present invention is not limited to the particular embodiments described herein, but is capable of various obvious changes, rearrangements and substitutions as will now become apparent to those skilled in the art without departing from the scope of the invention. Therefore, although the present invention has been described in greater detail by the above embodiments, the present invention is not limited to the above embodiments, and may include other equivalent embodiments without departing from the spirit of the present invention, and the scope of the present invention is determined by the scope of the appended claims.
Claims (13)
1. A method for realizing automatic retransmission request of an ad hoc network is characterized by comprising the following steps:
a receiving node receives first information sent by a sending node in a network, wherein the first information points to the receiving node;
if the receiving node determines that the number of the received first information sent by the same sending node reaches a preset number value, broadcasting first receiving state feedback information to the network when a next sending time slot arrives, so that each sending node adjusts an information sending mode of the respective next sending time slot according to the first receiving state feedback information, wherein the information sending mode comprises the steps of resending information which is not successfully received by the receiving node and sending new information according to a transmission requirement;
the preset quantity value satisfies the following conditions: n ═ INT (Q/a +1), where N is the preset number value, Q is the number of time slots in one complex frame, a is the total number of nodes in the wireless ad hoc network, and INT is an integer function;
the first receiving state feedback information includes feedback information of a receiving state of the first information sent by the receiving node to each sending node.
2. The method of claim 1, wherein broadcasting first reception state feedback information to the network by the receiving node upon arrival of a next transmission slot comprises:
and the receiving node broadcasts the first receiving state feedback information when a next fixed time slot pre-allocated to the receiving node arrives or when a next dynamic time slot pre-allocated to the receiving node arrives.
3. A method for realizing automatic retransmission request of an ad hoc network is characterized by comprising the following steps:
a sending node sends first information to a receiving node in a network and stores the first information, wherein the first information points to the corresponding receiving node;
the sending node receives first receiving state feedback information sent by a target receiving node, wherein the first receiving state feedback information comprises feedback information of receiving states of information sent by the target receiving node to the sending nodes; the first receiving state feedback information is broadcasted to the network when the next sending time slot of the target receiving node arrives after the target receiving node determines that the number of the received first information sent by the same sending node reaches a preset number value; the preset quantity value satisfies the following conditions: n ═ INT (Q/a +1), where N is the preset number value, Q is the number of time slots in one complex frame, a is the total number of nodes in the wireless ad hoc network, and INT is an integer function;
and the sending node adjusts an information sending mode of the next sending time slot of the sending node according to the feedback information of the receiving state of the first information sent by the sending node from the target receiving node in the first receiving state feedback information, wherein the information sending mode comprises the steps of resending the information which is not successfully received by the receiving node and sending new information according to the transmission requirement.
4. The method of claim 3, wherein the adjusting, by the sending node, the information transmission mode of the next transmission slot of the sending node according to the feedback information of the reception status of the first information sent by the sending node from the target receiving node in the first reception status feedback information comprises:
if the transmitting node determines that the receiving state of the target receiving node for the first information is correct to confirm the receiving according to the first receiving feedback information, the transmitting node discards the first information and transmits the information according to a normal transmitting mode when the next transmitting time slot is reached;
and if the transmitting node determines that the receiving state of the target receiving node for the first information is wrong according to the first receiving feedback information, the transmitting node retransmits the first information to the target receiving node when the next transmitting time slot arrives.
5. The method of claim 4, wherein after the transmitting node retransmits the first information to the target receiving node when the next transmission slot arrives, the method comprises:
and if the transmitting node determines that the cumulative number of times of retransmitting the first information to the target receiving node reaches two or three times, stopping retransmitting the first information and discarding the first information.
6. The method of claim 3, further comprising: if the sending node determines that the first receiving state feedback information sent by the target receiving node is not received within the set threshold number of multiframes, the first information of the feedback information in the receiving state is sent to the target receiving node again after the threshold number of multiframes are set.
7. The method of claim 6, wherein the set threshold satisfies: m > T, wherein M is the set threshold, and T satisfies: INT [ (A-1) × (N-1). times.A/Q ].
8. An apparatus for implementing an automatic repeat request in an ad hoc network, applied to a receiving node, comprises:
the information receiving module is used for receiving first information sent by a sending node in a network where the first information is located, and the first information points to the receiving node;
a feedback information sending module, configured to broadcast, if it is determined that the number of received first information sent by the same sending node reaches a preset number value, first receiving state feedback information to the network when a next sending time slot arrives, so that each sending node adjusts an information sending mode of a respective next sending time slot according to the first receiving state feedback information, where the information sending mode includes resending information that the receiving node did not successfully receive and sending new information according to a transmission requirement;
the preset quantity value satisfies the following conditions: n ═ INT (Q/a +1), where N is the preset number value, Q is the number of time slots in one complex frame, a is the total number of nodes in the wireless ad hoc network, and INT is an integer function;
the first receiving state feedback information includes feedback information of a receiving state of the first information sent by the receiving node to each sending node.
9. An apparatus for implementing automatic repeat request of ad hoc network, applied to a sending node, is characterized by comprising:
the information sending module is used for sending first information to a receiving node in a network and storing the first information, wherein the first information points to the corresponding receiving node;
a feedback information receiving module, configured to receive first receiving state feedback information sent by a target receiving node, where the first receiving state feedback information includes feedback information of receiving states of information sent by the target receiving node to each sending node; the first receiving state feedback information is broadcasted to the network when the next sending time slot of the target receiving node arrives after the target receiving node determines that the number of the received first information sent by the same sending node reaches a preset number value; the preset quantity value satisfies the following conditions: n ═ INT (Q/a +1), where N is the preset number value, Q is the number of time slots in one complex frame, a is the total number of nodes in the wireless ad hoc network, and INT is an integer function;
and a sending mode adjusting module, configured to adjust an information sending mode of a next sending time slot of the sending node according to the feedback information of the receiving state of the first information sent by the sending node from the first receiving state feedback information and the target receiving node, where the information sending mode includes resending information that the receiving node did not successfully receive and sending new information according to a transmission requirement.
10. A computer device comprising a memory, a processor and a computer program stored on the memory and executable on the processor, wherein the processor implements the method for implementing ad hoc network automatic repeat request according to any one of claims 1-2 when executing the program.
11. A computer-readable storage medium, on which a computer program is stored, which, when being executed by a processor, implements the method for implementing ad hoc network automatic repeat request according to any one of claims 1-2.
12. A computer device comprising a memory, a processor and a computer program stored on the memory and executable on the processor, wherein the processor implements the method for implementing ad hoc network automatic repeat request according to any one of claims 3 to 7 when executing the program.
13. A computer-readable storage medium, on which a computer program is stored, which, when being executed by a processor, implements the method for implementing ad hoc network automatic repeat request according to any one of claims 3 to 7.
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