CN104301951A - Data package forwarding method and device - Google Patents
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- CN104301951A CN104301951A CN201410510782.3A CN201410510782A CN104301951A CN 104301951 A CN104301951 A CN 104301951A CN 201410510782 A CN201410510782 A CN 201410510782A CN 104301951 A CN104301951 A CN 104301951A
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W36/00—Hand-off or reselection arrangements
- H04W36/02—Buffering or recovering information during reselection ; Modification of the traffic flow during hand-off
- H04W36/023—Buffering or recovering information during reselection
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W36/00—Hand-off or reselection arrangements
- H04W36/16—Performing reselection for specific purposes
- H04W36/18—Performing reselection for specific purposes for allowing seamless reselection, e.g. soft reselection
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Abstract
The embodiment of the invention provides a data package forwarding method and device. The method includes the steps that when a mobile node is switched to a destination node from a source node, a second node receives a data package which is from a first node and is sent to the mobile node, the data package is sent to the second node under the condition that the first node detects that the data package cannot be successfully sent to the mobile node, and the first node is used as the source node or the first node receives the data package from the source node; the second node sends the data package to the mobile node; if the second node detects that the data package cannot be successfully sent to the mobile node, the data package is sent to a third node, and accordingly the third node can send the data package to the mobile node. By means of the data package forwarding method and device, the forwarding time of the data package is shortened.
Description
Technical field
The present invention relates to communication technical field, particularly relate to a kind of data packet forwarding method and device.
Background technology
In the prior art, some node is transportable, and such as, the mobile terminals such as mobile phone can move.When these mobile nodes move in the coverage of another node from the coverage of a node, will switch.
At present, a kind of comparatively general changing method is direct-cut operation, and the method is also referred to as the non-forwarded mode of packet.In the method, when mobile node is from current node to another node motion, if the signal received from present node is more weak, and the signal received from destination node is stronger, then mobile node disconnects the connection with source node immediately, and connects with destination node.When mobile node is switched to destination node, stops receiving data from old node, carry out the transmitting-receiving of data immediately from destination node.Owing to not forwarding original connection or message, thus handoff procedure is quite fast.But the packet mailing to source node during switching just likely is lost, and Consumer's Experience is not high.
In order to avoid at handoff procedure packet loss, prior art proposes a kind of changing method, and the method is smooth-switch algorithm, also referred to as the pass-through mode of packet.In the method, when mobile node is switched to destination node, destination node sends broadcast message to source node.After source node receives broadcast message, according to the MAC Address of destination node in broadcast message, the packet mailing to mobile node of oneself buffer memory is forwarded to destination node, by destination node to mobile node forwarding data bag.The method decreases packet loss quantity to a certain extent, but, because source node is to the buffer memory of packet and forwarding, add the switching delay time on the contrary.
Therefore, the technical problem needing those skilled in the art urgently to solve at present is exactly: how while reduction packet loss, reduce the time that packet forwards.
Summary of the invention
Embodiment of the present invention technical problem to be solved is to provide a kind of data packet forwarding method, while reduction packet loss, to reduce the time that packet forwards.
Accordingly, the embodiment of the present invention additionally provides a kind of packet transfer device, packet, in order to ensure the implementation and application of said method.
In order to solve the problem, the invention discloses a kind of data packet forwarding method, comprise: when mobile node is switched to destination node from source node, Section Point receives the packet sending to mobile node from first node, wherein, described packet is that described first node detected send to described Section Point to described mobile node sends described packet failure when, and described first node is that described source node or described first node receive described packet from described source node; Described Section Point sends described packet to described mobile node; If described Section Point detects to described mobile node send the failure of described packet, then send described packet to the 3rd node, so that described 3rd node sends described packet to described mobile node.
Preferably, if described Section Point detects to described mobile node send the failure of described packet, then described Section Point judges whether the hop count of described packet is greater than predetermined threshold, if described hop count is not more than predetermined threshold, then forward described packet to described 3rd node; Otherwise, do not forward described packet.
Preferably, Section Point receive from first node send to the packet of mobile node after, described method also comprises: packet described in described Section Point buffer memory.
In order to solve the problem, the invention discloses a kind of data packet forwarding method, comprising: source node detects to mobile node and sends packet failure; Described source node sends described packet to first node, so that described first node sends described packet to described mobile node, and when described first node detect send described packet failure to described mobile node, described packet is sent, so that described Section Point sends described packet to described mobile node to Section Point.
Preferably, when described mobile node is switched to destination node from described source node, described source node detects to described mobile node and sends the failure of described packet.
In order to solve the problem, the invention discloses a kind of packet transfer device, packet, comprise: receiving element, for when mobile node is switched to destination node from source node, receive the packet sending to described mobile node from first node, wherein, described packet is that described first node detected send to described device to described mobile node sends described packet failure when, and described first node is that described source node or described first node receive described packet from described source node; Transmitting element, for sending described packet to described mobile node; Detecting unit, for detecting to described mobile node whether unsuccessfully to send described packet; Described transmitting element also for when the testing result of described detecting unit is failed, sends described packet to the 3rd node, so that described 3rd node sends described packet to described mobile node.
Preferably, described detecting unit also for when detect send described packet failure to described mobile node, judge whether the hop count of described packet is greater than predetermined threshold, if described hop count is not more than predetermined threshold, then described transmitting element is used for forwarding described packet to described 3rd node; Otherwise, do not forward described packet.
Preferably, described device also comprises: buffer unit, for packet described in buffer memory.
In order to solve the problem, the invention discloses a kind of packet transfer device, packet, comprising: detecting unit, sending packet failure for detecting to mobile node; Transmitting element, for sending described packet to first node, so that described first node sends described packet to described mobile node, and when described first node detect send described packet failure to described mobile node, described packet is sent, so that described Section Point sends described packet to described mobile node to Section Point.
Preferably, described detecting unit is used for when described mobile node is switched to destination node from described source node, detects to described mobile node and sends the failure of described packet.
Compared with prior art, the embodiment of the present invention comprises following advantage:
In the prior art, when adopting smooth-switch algorithm, when mobile node is switched to destination node, the packet mailing to mobile node of oneself buffer memory is forwarded to destination node by source node, by destination node to mobile node forwarding data bag.Because packets need sends to destination node from source node, be then transmitted to mobile node again by destination node, if the node between source node and destination node is too much, then can increase the forwarding time of packet.And in this application, when mobile node is switched to destination node, source node by Packet Generation to via node, packet can be transmitted to mobile node by via node, after waiting Packet Generation to destination node, just packet is transmitted to mobile node, thus while reduction packet loss, shorten the wireless distances that packet forwards, reduce the forwarding time of packet.
Accompanying drawing explanation
Fig. 1 is the flow chart of steps of a kind of data packet forwarding method embodiment of the present invention;
Fig. 2 is the flow chart of steps of another kind of data packet forwarding method embodiment of the present invention;
Fig. 3 is the flow chart of steps of another data packet forwarding method embodiment of the present invention;
Fig. 4 is the schematic diagram of three kinds of changing method switching delays;
Fig. 5 is the schematic diagram of three kinds of changing method packet loss amounts;
Fig. 6 is the structured flowchart of a kind of packet transfer device, packet embodiment of the present invention;
Fig. 7 is the preferred structured flowchart of a kind of packet transfer device, packet embodiment of the present invention;
Fig. 8 is the structured flowchart of another kind of packet transfer device, packet embodiment of the present invention.
Embodiment
For enabling above-mentioned purpose of the present invention, feature and advantage become apparent more, and below in conjunction with the drawings and specific embodiments, the present invention is further detailed explanation.
One of core idea of the embodiment of the present invention is, when mobile node is switched to destination node from source node, Section Point receives the packet sending to mobile node from first node, wherein, described packet is that described first node detected send to described Section Point to described mobile node sends described packet failure when, and described first node is that described source node or described first node receive described packet from described source node; Described Section Point sends described packet to described mobile node; If described Section Point detects to described mobile node send the failure of described packet, then send described packet to the 3rd node, so that described 3rd node sends described packet to described mobile node.In this application, when mobile node is switched to destination node, source node by Packet Generation to via node, packet can be transmitted to mobile node by via node, after waiting Packet Generation to destination node, just packet is transmitted to mobile node, thus while reduction packet loss, reduce the forwarding time of packet, thus reduce the switching delay time.
The embodiment of the present invention can be applied in wireless Mesh netword, in wireless Mesh netword, equal between node, and can carry out data retransmission mutually, each node both can provide access service, also provided routing function.When mobile node is from a node motion to another node, wireless connections are switched to node in the best state by it.In wireless Mesh netword, in order to provide the various application services met the demands, each node must switch asking of network node effectively.
With reference to Fig. 1, show the flow chart of steps of a kind of data packet forwarding method embodiment of the present invention, specifically can comprise the steps:
Step 102, when mobile node is switched to destination node from source node, Section Point receives the packet sending to mobile node from first node, wherein, described packet is that described first node detected send to described Section Point to described mobile node sends described packet failure when, and described first node is that described source node or described first node receive described packet from described source node;
In a preferred embodiment of the embodiment of the present invention, the packet that first node sends can be sent by the forms of broadcasting, and like this, first node, without the need to knowing the MAC Address of Section Point, can realize the transmission of packet.
When specific implementation, if mobile node successfully receives the packet that first node sends, then first node can receive notice and send successful message, if do not receive this message in the given time, then first node can be determined to send unsuccessfully.
Step 104, described Section Point sends described packet to described mobile node;
When specific implementation, Section Point receive from first node send to the packet of mobile node after, described Section Point can also packet described in buffer memory.
Step 106, if described Section Point detects to described mobile node send the failure of described packet, then sends described packet to the 3rd node, so that described 3rd node sends described packet to described mobile node.
When specific implementation, Section Point can adopt this packet of the mode identical with first node whether successfully to send to mobile node, if send successfully, then notifies that this packet of each node has sent successfully, without the need to forwarding this packet to other node again, thus save transfer resource.
In the present embodiment, Section Point and the 3rd node can be the via nodes between source node and destination node.First node can be source node itself, also can be the via node between source node and destination node.In the present embodiment, Section Point is only an example as via node, and other via nodes can complete the operation identical with Section Point.
In a preferred embodiment of the embodiment of the present invention, the max-forwards number of times of packet can be limited by predetermined threshold, if described Section Point detects to described mobile node send the failure of described packet, then described Section Point judges whether the hop count of described packet is greater than predetermined threshold, if described hop count is not more than predetermined threshold, then forward described packet to described 3rd node; Otherwise, do not forward described packet.This hop count can be each node add packet in certain position (such as, add packet header to), initial hop count is 0, often forwards once, hop count adds 1, and Section Point can determine whether by the hop count in packet to be greater than predetermined threshold.In the present embodiment, by limiting max-forwards number of times, avoiding the open-rely to packet, thus saving transfer resource.
In the prior art, when adopting smooth-switch algorithm, when mobile node is switched to destination node, the packet mailing to mobile node of oneself buffer memory is forwarded to destination node by source node, by destination node to mobile node forwarding data bag.Because packets need sends to destination node from source node, be then transmitted to mobile node again by destination node, if the node between source node and destination node is too much, then can increase the forwarding time of packet.And in this application, when mobile node is switched to destination node, source node by Packet Generation to via node, packet can be transmitted to mobile node by via node, after waiting Packet Generation to destination node, just packet is transmitted to mobile node, thus while reduction packet loss, reduces the forwarding time of packet.
With reference to Fig. 2, show the flow chart of steps of a kind of data packet forwarding method embodiment of the present invention, specifically can comprise the steps:
Step 202, source node detects to mobile node and sends packet failure;
In a preferred embodiment of the embodiment of the present invention, when described mobile node is switched to destination node from described source node, described source node detects to described mobile node and sends the failure of described packet.
When specific implementation, if mobile node successfully receives the packet that source node sends, then source node can receive notice and send successful message, if do not receive this message in the given time, then source node can be determined to send unsuccessfully.
Step 204, described source node sends described packet to first node, so that described first node sends described packet to described mobile node, and when described first node detect send described packet failure to described mobile node, described packet is sent, so that described Section Point sends described packet to described mobile node to Section Point.
In the present embodiment, first node and Section Point can be the via nodes between source node and destination node, can complete embodiment illustrated in fig. 1 in the operation of via node.
In the prior art, when adopting smooth-switch algorithm, when mobile node is switched to destination node, the packet mailing to mobile node of oneself buffer memory is forwarded to destination node by source node, by destination node to mobile node forwarding data bag.Because packets need sends to destination node from source node, be then transmitted to mobile node again by destination node, if the node between source node and destination node is too much, then can increase the forwarding time of packet.And in this application, when mobile node is switched to destination node, source node by Packet Generation to via node, packet can be transmitted to mobile node by via node, after waiting Packet Generation to destination node, just packet is transmitted to mobile node, thus while reduction packet loss, reduces the forwarding time of packet.
With reference to Fig. 3, show the flow chart of steps of a kind of data packet forwarding method embodiment of the present invention, specifically can comprise the steps:
Step 302, node A sends this packet to relaying (visible) Node B after sending packet failure to node C;
Step 304, this packet of Node B buffers, after sending packet success to node C, notice node A has forwarded successfully, without the need to forwarding this packet again; If send unsuccessfully, then send this packet to relaying (visible) node D;
Step 306, this packet of node D buffer memory, after sending packet success to node C, then notify that these data of Node B have sent successfully, then, Node B reinforms node A; If send unsuccessfully, then node D sends this packet to relaying (visible) node E;
Step 308, this packet of node E buffer memory, after sending packet success to node C, then notify that these data of node D have sent successfully, node D notifies Node B, and Node B reinforms node A; If failure, send this packet to relaying (visible) node F, by that analogy, until successfully by this Packet Generation to node C.If the number of times that this packet forwards in node is greater than predetermined threshold, then no longer forward this packet, avoid unrestrictedly forwarding the data cached bag that this packet causes and take massive band width.
In the present embodiment, node A is source node, node C is mobile node, Node B, D, E and F are all via node, all nodes all carry out data interaction by broadcasting packet, when success sends after packet to node C, via node can notified message, avoids again sending this packet.
Fig. 4 is the schematic diagram of three kinds of changing method switching delays, as shown in Figure 4, compared with traditional storage forwarding smooth-switch algorithm, the switching delay of the storage forwarding smooth-switch algorithm based on via node that the present embodiment provides obtains certain improvement, this is because add the success rate of forwarding data bag based on the algorithm of via node.
Fig. 5 is the schematic diagram of three kinds of changing method packet loss amounts, and as shown in Figure 5, the packet loss quantity of direct-cut operation is maximum.Due to reasons such as the time variation of wireless transmission medium, unsteadiness, decay and channel conflictions, the jumping figure that packet forwards is more, and the probability of loss is larger.Therefore, compared with traditional storage forwarding smooth-switch algorithm, the data-bag lost situation of the storage forwarding smooth-switch algorithm based on via node that the present embodiment provides is significantly improved.
In the present embodiment, data pack buffer is on the node of relay forwarding, after mobile node successful switch completes, the packet of these buffer memorys will be forwarded directly to mobile node from via node, shorten the wireless distances that packet forwards, and source node improves success rate to the packet of mobile node through Buffer forwarding, network rate is shaken diminish, data-bag lost situation improves.
It should be noted that, for embodiment of the method, in order to simple description, therefore it is all expressed as a series of combination of actions, but those skilled in the art should know, the embodiment of the present invention is not by the restriction of described sequence of movement, because according to the embodiment of the present invention, some step can adopt other orders or carry out simultaneously.Secondly, those skilled in the art also should know, the embodiment described in specification all belongs to preferred embodiment, and involved action might not be that the embodiment of the present invention is necessary.
With reference to Fig. 6, show the structured flowchart of a kind of packet transfer device, packet embodiment of the present invention, this device can use as via node, specifically can comprise as lower module:
Receiving element 602, for when mobile node is switched to destination node from source node, receive the packet sending to described mobile node from first node, wherein, described packet is that described first node detected send to described device to described mobile node sends described packet failure when, and described first node is that described source node or described first node receive described packet from described source node;
Transmitting element 604, for sending described packet to described mobile node;
Detecting unit 606, for detecting to described mobile node whether unsuccessfully to send described packet;
Described transmitting element 604 also for when the testing result of described detecting unit is failed, sends described packet to the 3rd node, so that described 3rd node sends described packet to described mobile node.
In a preferred embodiment of the embodiment of the present invention, described detecting unit 606 also for when detect send described packet failure to described mobile node, judge whether the hop count of described packet is greater than predetermined threshold, if described hop count is not more than predetermined threshold, then described transmitting element is used for forwarding described packet to described 3rd node; Otherwise, do not forward described packet.
Fig. 7 shows the preferred structured flowchart of a kind of packet transfer device, packet of the present invention embodiment, and as shown in Figure 7, in a preferred embodiment of the embodiment of the present invention, described device also comprises:
Buffer unit 702, for packet described in buffer memory.
With reference to Fig. 8, show the structured flowchart of a kind of packet transfer device, packet embodiment of the present invention, this device can use as source node, specifically can comprise as lower module:
Detecting unit 802, sends packet failure for detecting to mobile node;
Transmitting element 804, for sending described packet to first node, so that described first node sends described packet to described mobile node, and when described first node detect send described packet failure to described mobile node, described packet is sent, so that described Section Point sends described packet to described mobile node to Section Point.
In a preferred embodiment of the embodiment of the present invention, described detecting unit 802, for when described mobile node is switched to destination node from described source node, detects to described mobile node and sends the failure of described packet.
For device embodiment, due to itself and embodiment of the method basic simlarity, so description is fairly simple, relevant part illustrates see the part of embodiment of the method.
Each embodiment in this specification all adopts the mode of going forward one by one to describe, and what each embodiment stressed is the difference with other embodiments, between each embodiment identical similar part mutually see.
Those skilled in the art should understand, the embodiment of the embodiment of the present invention can be provided as method, device or computer program.Therefore, the embodiment of the present invention can adopt the form of complete hardware embodiment, completely software implementation or the embodiment in conjunction with software and hardware aspect.And the embodiment of the present invention can adopt in one or more form wherein including the upper computer program implemented of computer-usable storage medium (including but not limited to magnetic disc store, CD-ROM, optical memory etc.) of computer usable program code.
The embodiment of the present invention describes with reference to according to the flow chart of the method for the embodiment of the present invention, terminal equipment (system) and computer program and/or block diagram.Should understand can by the combination of the flow process in each flow process in computer program instructions realization flow figure and/or block diagram and/or square frame and flow chart and/or block diagram and/or square frame.These computer program instructions can being provided to the processor of all-purpose computer, special-purpose computer, Embedded Processor or other programmable data processing terminal equipment to produce a machine, making the instruction performed by the processor of computer or other programmable data processing terminal equipment produce device for realizing the function of specifying in flow chart flow process or multiple flow process and/or block diagram square frame or multiple square frame.
These computer program instructions also can be stored in can in the computer-readable memory that works in a specific way of vectoring computer or other programmable data processing terminal equipment, the instruction making to be stored in this computer-readable memory produces the manufacture comprising command device, and this command device realizes the function of specifying in flow chart flow process or multiple flow process and/or block diagram square frame or multiple square frame.
These computer program instructions also can be loaded on computer or other programmable data processing terminal equipment, make to perform sequence of operations step to produce computer implemented process on computer or other programmable terminal equipment, thus the instruction performed on computer or other programmable terminal equipment is provided for the step realizing the function of specifying in flow chart flow process or multiple flow process and/or block diagram square frame or multiple square frame.
Although described the preferred embodiment of the embodiment of the present invention, those skilled in the art once obtain the basic creative concept of cicada, then can make other change and amendment to these embodiments.So claims are intended to be interpreted as comprising preferred embodiment and falling into all changes and the amendment of embodiment of the present invention scope.
Finally, also it should be noted that, in this article, the such as relational terms of first and second grades and so on is only used for an entity or operation to separate with another entity or operating space, and not necessarily requires or imply the relation that there is any this reality between these entities or operation or sequentially.And, term " comprises ", " comprising " or its any other variant are intended to contain comprising of nonexcludability, thus make to comprise the process of a series of key element, method, article or terminal equipment and not only comprise those key elements, but also comprise other key elements clearly do not listed, or also comprise by the intrinsic key element of this process, method, article or terminal equipment.When not more restrictions, the key element limited by statement " comprising ... ", and be not precluded within process, method, article or the terminal equipment comprising described key element and also there is other identical element.
Above to a kind of data packet forwarding method provided by the present invention and device, be described in detail, apply specific case herein to set forth principle of the present invention and execution mode, the explanation of above embodiment just understands method of the present invention and core concept thereof for helping; Meanwhile, for one of ordinary skill in the art, according to thought of the present invention, all will change in specific embodiments and applications, in sum, this description should not be construed as limitation of the present invention.
Claims (10)
1. a data packet forwarding method, is characterized in that, comprising:
When mobile node is switched to destination node from source node, Section Point receives the packet sending to mobile node from first node, wherein, described packet is that described first node detected send to described Section Point to described mobile node sends described packet failure when, and described first node is that described source node or described first node receive described packet from described source node;
Described Section Point sends described packet to described mobile node;
If described Section Point detects to described mobile node send the failure of described packet, then send described packet to the 3rd node, so that described 3rd node sends described packet to described mobile node.
2. method according to claim 1, it is characterized in that, if described Section Point detects to described mobile node send the failure of described packet, then described Section Point judges whether the hop count of described packet is greater than predetermined threshold, if described hop count is not more than predetermined threshold, then forward described packet to described 3rd node; Otherwise, do not forward described packet.
3. method according to claim 1, is characterized in that, Section Point receive from first node send to the packet of mobile node after, described method also comprises:
Packet described in described Section Point buffer memory.
4. a data packet forwarding method, is characterized in that, comprising:
Source node detects to mobile node and sends packet failure;
Described source node sends described packet to first node, so that described first node sends described packet to described mobile node, and when described first node detect send described packet failure to described mobile node, described packet is sent, so that described Section Point sends described packet to described mobile node to Section Point.
5. method according to claim 4, is characterized in that, when described mobile node is switched to destination node from described source node, described source node detects to described mobile node and sends the failure of described packet.
6. a packet transfer device, packet, is characterized in that, comprising:
Receiving element, for when mobile node is switched to destination node from source node, receive the packet sending to described mobile node from first node, wherein, described packet is that described first node detected send to described device to described mobile node sends described packet failure when, and described first node is that described source node or described first node receive described packet from described source node;
Transmitting element, for sending described packet to described mobile node;
Detecting unit, for detecting to described mobile node whether unsuccessfully to send described packet;
Described transmitting element also for when the testing result of described detecting unit is failed, sends described packet to the 3rd node, so that described 3rd node sends described packet to described mobile node.
7. device according to claim 6, it is characterized in that, described detecting unit also for when detect send described packet failure to described mobile node, judge whether the hop count of described packet is greater than predetermined threshold, if described hop count is not more than predetermined threshold, then described transmitting element is used for forwarding described packet to described 3rd node; Otherwise, do not forward described packet.
8. device according to claim 6, is characterized in that, described device also comprises:
Buffer unit, for packet described in buffer memory.
9. a packet transfer device, packet, is characterized in that, comprising:
Detecting unit, sends packet failure for detecting to mobile node;
Transmitting element, for sending described packet to first node, so that described first node sends described packet to described mobile node, and when described first node detect send described packet failure to described mobile node, described packet is sent, so that described Section Point sends described packet to described mobile node to Section Point.
10. device according to claim 9, is characterized in that, described detecting unit is used for when described mobile node is switched to destination node from described source node, detects to described mobile node and sends the failure of described packet.
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| CN110740146A (en) * | 2018-07-18 | 2020-01-31 | 贵州白山云科技股份有限公司 | method and device for scheduling cache nodes and computer network system |
| CN110740146B (en) * | 2018-07-18 | 2020-06-26 | 贵州白山云科技股份有限公司 | Method and device for scheduling cache nodes and computer network system |
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