CN101521557A - Method and system for error control and congestion control - Google Patents

Method and system for error control and congestion control Download PDF

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CN101521557A
CN101521557A CN200810065494A CN200810065494A CN101521557A CN 101521557 A CN101521557 A CN 101521557A CN 200810065494 A CN200810065494 A CN 200810065494A CN 200810065494 A CN200810065494 A CN 200810065494A CN 101521557 A CN101521557 A CN 101521557A
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hop
module
communication link
control
error
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CN101521557B (en
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李云
庄宏成
刘占军
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Huawei Technologies Co Ltd
Chongqing University of Post and Telecommunications
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Huawei Technologies Co Ltd
Chongqing University of Post and Telecommunications
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B7/00—Radio transmission systems, i.e. using radiation field
    • H04B7/14—Relay systems
    • H04B7/15—Active relay systems
    • H04B7/185—Space-based or airborne stations; Stations for satellite systems
    • H04B7/18502—Airborne stations
    • H04B7/18506—Communications with or from aircraft, i.e. aeronautical mobile service
    • H04B7/18508—Communications with or from aircraft, i.e. aeronautical mobile service with satellite system used as relay, i.e. aeronautical mobile satellite service

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Abstract

本发明公开了一种差错控制和拥塞控制方法和系统，差错控制方法包括检测到报文错误，判断通信链路是否连续，根据通信链路是否连续的判断结果采用不同的差错控制机制。拥塞控制方法包括检测到通信链路拥塞，判断通信连续是否连续，根据通信链路是否连续的判断结果采用不同的拥塞控制机制。差错控制系统包括报文检测模块，通信链路判断模块，差错控制决策模块和差错控制模块。拥塞控制系统包括拥塞检测模块，通信链路判断模块，拥塞控制决策模块，拥塞控制模块。有效的解决了网络比如无线互联网络的差错控制和拥塞控制。

Figure 200810065494

The invention discloses an error control and congestion control method and system. The error control method includes detecting message errors, judging whether the communication link is continuous, and adopting different error control mechanisms according to the judging result of whether the communication link is continuous. The congestion control method includes detecting the communication link congestion, judging whether the communication is continuous or not, and adopting different congestion control mechanisms according to the judging result of whether the communication link is continuous or not. The error control system includes a message detection module, a communication link judgment module, an error control decision module and an error control module. The congestion control system includes a congestion detection module, a communication link judgment module, a congestion control decision module, and a congestion control module. It effectively solves the error control and congestion control of networks such as wireless Internet networks.

Figure 200810065494

Description

Error control and congestion control method and system
Technical field
The present invention relates to the communication technology, be specifically related to a kind of wireless internet network error control and congestion control method and system.
Background technology
Wireless internet network is called the wireless multi-hop the Internet again, realizes that with wireless mode terminal equipment connects such as the wireless multi-hop between the mobile terminal device, provides the communication service of similar wired internet (Internet).(as GSM, 3G) compares with traditional mobile communication system, a key character of wireless internet network is the interconnection that can realize in the mode of wireless multi-hop between the Wireless Telecom Equipment, its Wireless Telecom Equipment is the end system of generation and process information usually, it is again the intermediate system of forwarding information, therefore, require them to have routing function usually.
Wireless internet network has networking flexibility, enforcement is convenient, capability to resist destruction is strong, frequency spectrum reusability advantages of higher, since proposing, just received the very big concern of academia, military circles and industrial quarters, especially in recent years, be that the wireless internet network technology of representative more becomes one of research and development focus of wireless communication field with mobile ad-hoc network (MANET:Mobile Ad hoc NETworks), wireless Mesh netword, wireless sensor network.
Because wireless internet network adopts Radio Transmission Technology, compares with cable communicating technology, the distinguishing feature of radio communication is error rate height, limited bandwidth, and therefore, error control and congested control are one of wireless internet network key technologies that need solve.In traditional the Internet; for the end-to-end reliable transmission that guarantees to divide into groups; avoid network congestion; usually adopt error control and congestion control policy end to end in transport layer; existing error control end to end and congestion control policy are usually based on following basic assumption: suppose to exist between communicating pair and maybe can set up reliably path end to end; although this hypothesis is set up in the wired internet network, in wireless Internet, this hypothesis is not always set up.In wireless Internet, owing to influenced by natural disturbance and human factor, the Radio Link between the node can interrupt and can not guarantee consistent the existence, and this makes that the communication path between the communicating pair is also unreliable, even does not have path end to end.The reason that causes Radio Link to be interrupted mainly contains:
1), obstacle stops and electromagnetic interference.
2), node moves.
3), in order to reach some purpose, the people is interrupted for causing Radio Link.As in sensor network, in order to reduce energy consumption, artificially to dispatch sensor node and be in periodic resting state, this may cause network interruption to occur connecting between subregion and the node.
4), in some occasion, such as interplanetary Internet (IPN:InterPlaNet), can't set up continuous Radio Link between the communication node at all.
The discontinuity of Radio Link is may not have reliably path end to end between the communicating pair to the direct influence of communication, and this makes in traditional the Internet that error control can not directly apply to congested control technology end to end and is connected the wireless internet network with interruption characteristic.
Has cycle discontinuity and end-to-end path has the characteristics of long delay at the Radio Link of wireless Internet, over nearly 1 year, IETF subordinate's the DTNRG of research group (Delay Torrent NetworkResearch Group) has proposed a kind of network architecture based on Bundle in 2007, Bundle be superimposed upon on the transport layer, the communication protocol under the application layer, with the message (being also referred to as Bundle) of any length protocol Data Unit (PDU:Protocol Data Unit) as this layer.Bundle adopts message-oriented store-and-forward mode, allows message to be stored in for a long time in the permanent storage media at intermediate node, is delivered to destination node up to message.
Bundle still adopts traditional routing policy in network layer, still adopts traditional error control and congestion control mechanism in transport layer, and therefore, Bundle also is not suitable for being interrupted the wireless internet network of connection.In addition, Bundle allows message longer-term storage on permanent storage media, can use up to the outlet Radio Link, therefore, it has certain adaptive capacity to the interspace Radio Link of periodic interruptions, but because Bundle aims at the interplanetary Internet design, be operated on the traditional network layer and transport layer, and realize complicated, disposal ability and storage capacity to Wireless Telecom Equipment all have very high requirement, and are not suitable for wireless connections and interrupt at random, disposal ability, the wireless internet network (as mobile Ad hoc network and sensor network etc.) that storage capacity and energy are all limited.
In sum, the inventor finds: prior art is primarily aimed at the network that has continuous connection performance about congested control and error-control schemes, and be not suitable for the network that link is connected to the interruption characteristic, need the congested control and the error-control schemes that can solve the network that may include link connection performance with interruption.
Summary of the invention
The embodiment of the invention provides a kind of error control and congestion control method and system, has effectively solved error control and the congested control of network such as wireless internet network.
The embodiment of the invention provides a kind of error control to comprise and detects the message mistake, judge whether communication is continuous continuously, and whether continuous judged result adopts different error control mechanisms according to communication link.
It is congested that the embodiment of the invention provides a kind of jamming control method to comprise to detect communication link, judges whether communication is continuous continuously, and whether continuous judged result adopts different congestion control mechanisms according to communication link.
The embodiment of the invention provides a kind of accuracy control system, comprising: the message detection module, be used for whether mistake of detection messages, and optionally send the message error message to the communication link judge module; The communication link judge module is used for receiving the message error message from the message detection module, judges whether communication link is continuous; The error control decision-making module is used for receiving the judged result from the communication link judge module, and according to the judged result of communication link judge module, the decision-making error control mechanism; Error Control module is used for receiving the control indication from the error control decision-making module, and indicates according to the control of error control decision-making module, carries out corresponding error control.
A kind of congestion control system that the embodiment of the invention provides comprises: the congestion detection module, and whether congested, optionally send link congestion information to the communication link judge module if being used for detecting communication link; The communication link judge module is used for receiving the link congestion information from the congestion detection module, judges whether communication link is continuous; Congested control decision module is used for receiving the judged result from the communication link judge module, and according to the judged result from the communication link judge module, the decision-making congestion control mechanism; Congested control module is used for receiving the control indication from congested control decision module, and indicates according to the control of congested control decision module, carries out corresponding congestion control mechanism.
The embodiment of the invention is by the connection performance of phase-split network communication link, connection performance according to network communication link carries out corresponding error control and congestion control mechanism, can more effectively solve error control and the congested control problem of network such as wireless internet network.
Description of drawings
Fig. 1 has the wireless Internet schematic diagram that is interrupted connection performance;
Fig. 2 is an error control method embodiment flow chart;
Fig. 3 is a hop-by-hop error control method embodiment schematic diagram;
Fig. 4 is a multi-hop error control method embodiment schematic diagram;
Fig. 5 is a jamming control method embodiment flow chart;
Fig. 6 is accuracy control system example structure figure;
Fig. 7 is congestion control system example structure figure;
Fig. 8 is a multi-hop jamming control method embodiment schematic diagram;
Fig. 9 is a hop-by-hop jamming control method embodiment schematic diagram.
Embodiment
The embodiment of the invention provides a kind of new network error control and congestion control system and method, can effectively solve the network for example error control and the congested control problem of wireless internet network.
The present invention is described in detail below in conjunction with drawings and the specific embodiments.
Be understandable that the embodiment of the invention not only goes for but is not limited to have the network of the link connection performance of interruption, such as wireless internet network.Be that example is not introduced the present invention is construed as limiting below with the wireless internet network.
Fig. 1 has the wireless Internet schematic diagram that is interrupted connection performance.Whole communication network is made up of notebook computer, base station, airborne communication platform (such as aircraft, dirigible etc.), communication satellite and palmtop PC (PDA, Personal Digital Assistant).Can set up continuous Radio Link between notebook computer and the base station, also can there be continuous Radio Link between communication satellite and the PDA, but while coverage base station and communication satellite situation at one time may appear in the radio signal of airborne communication platform, therefore, between base station and the airborne communication platform, just may there be the interruption Radio Link between airborne communication platform and the communication satellite.Certainly, when airborne communication platform and base station near the time, also can have continuous Radio Link between the two; When the airborne communication platform is in the visual range of satellite, also can there be continuous Radio Link between the two.The discontinuity of Radio Link is may not have path end to end between the communicating pair to the direct influence of communication, as shown in Figure 1, because the Radio Link between base station and the airborne communication platform, between airborne communication platform and the communication satellite is interrupted, so, just can not set up a continuous link end to end between notebook computer and the PDA.
Understand for convenience and be interrupted link and continuous link, can this notion be as an example with " contact (CT:Contact) ".So-called contact can be chance that can direct communication between two nodes in the network.Once contact between two nodes can be described with a five-tuple, i.e. CT=(S, R, T s, T e, C), wherein S represents the source end of link, and the destination of R statement link, Ts, Te are represented time started and concluding time of contacting respectively, and C is illustrated in the once contact, and S is to the average data transmission rate of R.If all can realize direct communication between this two node at any time, or the connection that is no more than the data session agreement break time is interrupted the maximum allowed time (being generally 2 minutes), just there is Continuous Contact between these two nodes, or claims that the communication link between these two nodes is continuous; Otherwise we claim that the communication link between two nodes is be interrupted discontinuous in other words conj.or perhaps.Further, we can be interrupted the connection wireless internet network with existing the wireless internet network that is interrupted Radio Link to be called.Certainly abovely the present invention is not constituted qualification for example, the scope that other similar explanations of those of ordinary skills also belong to the present invention to be protected for what be interrupted link and continuous link.
Understand various embodiments of the present invention for convenience, provide following illustration for single-hop control, multi-hop control and end-to-end control.Single-hop (Single-hop) control: refer to that the controlled function in the network directly finished by communicating pair, and the communicating pair direct communication, do not need the forwarding of intermediate node.Multi-hop (Multi-hop) control: refer to that the controlled function in the network need participate in just finishing by intermediate node.End-to-end (End-to-End) control: refer in the network controlled function by source node and (or) destination node finishes jointly or separately, do not need a kind of control mode of the participation of intermediate node.
Embodiment one has described a kind of error-control method.
Come error-control method in the illustrated embodiments one below in conjunction with Fig. 2.
Square frame 201 is the processing of detection messages mistake.Present embodiment can adopt technology such as cyclic redundancy check (CRC) or message segment retransmission timer be overtime to come the detection messages mistake.
Square frame 202 processing for judging that communication link is whether continuous.
According to the whether continuous result of communication link, adopt different error control methods, such as, if link is continuous, can adopt the error control of error control end to end or hop-by-hop; If link is discontinuous, can adopt the multi-hop error control, perhaps also can adopt the error control of hop-by-hop.
Preferred scheme is for further to carry out meticulousr error control according to the communication link error rate.
Square frame 203 and square frame 204 are for to judge whether the error rate is lower than the processing of threshold value.
If square frame 205 is continuous for link, and, then adopt error control method end to end if the error rate is lower than threshold value.
For no matter link is continuously or discontinuous to square frame 206, if the error rate is not less than threshold value, then adopts the error control method of hop-by-hop.
If square frame 207 is discontinuous for link, and, then adopt the error control method of multi-hop if the error rate is lower than threshold value.
It will be appreciated by those skilled in the art that Fig. 2 is the schematic diagram of a preferred embodiment, the processing links among Fig. 2 might not be that enforcement the present invention is necessary.And the Rule of judgment in square frame 203 and the square frame 204 can be not limited to Fig. 2 for example, change " judge that the error rate whether be lower than or equal threshold value " into such as condition, other treatment step corresponding modify, similar variation all is to belong to protection range of the present invention.
Come the error control method of illustration hop-by-hop and multi-hop below in conjunction with Fig. 3 and Fig. 4.
In Fig. 3, node 1 and node 6 constitute communicating pair, and node 1 is a source node, and node 6 is destination nodes.Wherein the link between node 1 and node 2, node 2 and node 3, node 4 and node 5, node 5 and the node 6 is the lower and continuous Radio Link of the error rate, and the link of node 3 and node 4 is the higher Radio Links of the error rate.
Error control method is as follows under situation shown in Figure 3: when node 4 detects mistake, then node 4 sends a negative affirmation to node 3, and node 3 receives that this negates after determining, just to node 4 re-transmission error messages, reaches error checking purposes.Under the high situation of link error rates, adopt the error control strategy of hop-by-hop, can avoid carrying out unnecessary retransmission, thereby save air-link resources, reduce the time that mistake is recovered with retransmission limit at the mistake link at other links.
Further, we are in conjunction with the error control method of Fig. 4 explanation when having the Radio Link that is interrupted.In Fig. 4, node 1 and node 6 constitute communicating pair, and node 1 is a source node, and node 6 is destination nodes.Wherein the link between node 1 and node 2, node 2 and node 3, node 4 and node 5, node 5 and the node 6 is the lower and continuous Radio Link of the error rate, and the link of node 3 and node 4 is interrupted.
Error control method is as follows under situation shown in Figure 4: when node 3 detects mistake, then node 3 sends a negative affirmation to source node, receives after this Negative Acknowledgement, and source node just to node 3 re-transmission error messages, reaches error checking purposes.The reason that adopts above-mentioned multi-hop error control mechanism is when the link between node 3 and the node 4 is interrupted, the affirmation end to end (ACK) of being beamed back by node 6 is return node 1 in time, by above-mentioned multi-hop error control mechanism, can in time recover, and in time the packet that retransmits be forwarded continuous time at link by node 3 to mistake.Certainly, node 3 also can adopt the error control mechanism of hop-by-hop, perhaps also can further judge that according to the node 3 and the error rate situation of node 4 error control mechanism that adopts hop-by-hop still adopts the error control mechanism of multi-hop.
Embodiment one can carry out different error control by the continuous or discrete characteristic of link, and further can the junction link characteristic carry out different error control with error ratio characteristic, can be with retransmission limit at the mistake link, avoid carrying out unnecessary retransmission at other links, thereby the saving air-link resources reduces the time that mistake is recovered; Perhaps can in time recover, as early as possible data retransmission mistake.
Embodiment two has described a kind of congestion control method.
Come congestion control method in the illustrated embodiments one below in conjunction with Fig. 5.
Square frame 501 is for detecting the congested processing of communication link.
Square frame 502 processing for judging that communication link is whether continuous.
According to the whether continuous result of communication link, adopt different jamming control methods, such as, when link is continuous, can adopt the congested control of congested end to end control or hop-by-hop; When link is discontinuous, can adopt the congested control of multi-hop, perhaps also can adopt the congested control of hop-by-hop.
Preferred scheme is for further to carry out meticulousr congested control according to the situation of link bandwidth variable quantity in the unit interval.
Square frame 503 and square frame 504 is for judging whether link bandwidth variable quantity in the unit interval is higher than the processing of threshold value.
If square frame 505 is continuous for link, and, then adopt error control method end to end if the link bandwidth variable quantity is not higher than threshold value in the unit interval.
For no matter link is continuously or discontinuous to square frame 506, if if the link bandwidth variable quantity is higher than threshold value in the unit interval, then adopt the error control method of hop-by-hop.
If square frame 507 is discontinuous for link, and, then adopt the error control method of multi-hop if the link bandwidth variable quantity is not higher than threshold value in the unit interval.
It will be appreciated by those skilled in the art that Fig. 5 is the schematic diagram of a preferred embodiment, the processing links among Fig. 5 might not be that enforcement the present invention is necessary.And the Rule of judgment in square frame 503 and the square frame 504 can be not limited to giving an example of Fig. 5; change " judge in the unit interval link bandwidth variable quantity whether be higher than or equal threshold value " into such as condition; other treatment step corresponding modify, similarly variation all is to belong to protection range of the present invention.
The present embodiment congestion detection method can detect by the following method:
Figure A200810065494D00161
If can sketching, this detection method is the average occupancy of formation average occupancy thresholding greater than formation, if perhaps the average service time of MAC layer data grouping is greater than the average service time thresholding of MAC layer data grouping, perhaps the average collision probability of MAC layer grouping is greater than the average collision probability thresholding of MAC layer grouping, then link takes place congestedly, otherwise that link does not take place is congested.The Rule of judgment of certain above-mentioned detection method also can change; can change " if the average occupancy of formation is greater than or equal to the average occupancy thresholding of formation " into such as " if the average occupancy of formation is greater than average occupancy thresholding of formation ", similarly variation all belongs to protection scope of the present invention.
In said method, S is the average occupancy of formation, S ThBe the average occupancy thresholding of formation, the method for calculating S is as follows: by formula S New=aS Old+ (1-a) S TempCalculate S, S NewBe the average occupancy of formation to be calculated, S OldBe the average occupancy of the formation that had before calculated, the average occupancy of once calculating before " before " can refer to herein of formation also can refer to previous any average occupancy of once calculating of formation, S TempFor the instantaneous occupancy of formation, every regular hour t, the occupancy of formation is added up, and give S the statistical value assignment Temp, α is the smoothing factor of queue occupancy
In said method, T is the average service time of MAC layer data grouping, promptly receives packet to average time that this packet is successfully sent from the MAC layer.T ThBe the thresholding of the average service time of MAC layer data grouping, the method for calculating T is as follows: by formula T New=β T Old+ (1-β) T TempCalculate T, wherein, T NewBe the average service time of MAC layer data grouping to be calculated, T OldBe the average service time that the MAC layer data that had before calculated is divided into groups, the average service time of the MAC layer data of once calculating before " before " can refer to herein grouping also can refer to the average service time that previous any MAC layer data of once calculating is divided into groups, T TempFor the MAC layer is given the service time of given data packet, the MAC layer is every successfully to send a data grouping, and be T the service time of calculating it Temp, β is the smoothing factor of queue occupancy.
In said method, P is the average collision probability of MAC layer grouping, P ThBe the average collision probability thresholding of MAC layer grouping, the method for calculating P is as follows: P by formula New=λ P Old+ (1-γ) P TempCalculate P, wherein P NewBe the average collision probability of MAC layer grouping to be calculated, P OldBe the average collision probability that the MAC layer that had before calculated divides into groups, the average collision probability of the MAC layer that once calculates before " before " can refer to herein grouping also can refer to the average collision probability that previous any MAC layer that once calculates divides into groups, P TempFor the sample value of MAC layer packet collisions probability, every regular hour t, send the collision probability of grouping in the timing statistics t, promptly use collision frequency divided by total transmission number of times, and give P the statistical value assignment Temp, γ is the smoothing factor of packet collisions probability.
Carry out the jamming control method of illustration hop-by-hop and multi-hop below in conjunction with Fig. 8 and Fig. 9.
As shown in Figure 8, node 1 and node 6 constitute communicating pair, and node 1 is a source node, and node 6 is destination nodes.Wherein the link between node 1 and node 2, node 2 and node 3, node 4 and node 5, node 5 and the node 6 for continuously and bandwidth variable quantity in the unit interval be lower than the link of threshold value, and the link of node 3 and node 4 is that the link that is interrupted is such as the Radio Link that is interrupted.The jamming control method of multi-hop is as follows: send professional the generation when congested when node 3 detects to downstream node such as node 4, and the bandwidth of node 3 and the link of node 4 changes in the unit interval and is lower than threshold value, then node 3 sends congestion indicating message to source node, source node is received after the congestion indicating message, reduce data transmission rate, reach and reduce congested purpose.
As shown in Figure 9, node 1 and node 6 constitute communicating pair, and node 1 is a source node, and node 6 is destination nodes.Link between node 1 and node 2, node 2 and the node 3 is link or the Radio Link that unit interval link bandwidth variable quantity is higher than threshold value, node 3 is the Radio Link of the link of interruption such as interruption with node 4, and the link between node 4 and node 5, node 5 and the node 6 is the link that the bandwidth change amount is lower than threshold value in continuous and unit interval.The jamming control method of hop-by-hop is as follows: when node 3 detects congested such as the professional generation of node 4 transmissions to downstream node, and the bandwidth of link changes in the unit interval and has surpassed threshold value, then node 3 sends congestion indicating message to node 2, after node 2 is received congestion indicating message, reduce data forwarding speed; If node 2 occurs congestedly because of reducing data forwarding speed, then node 2 further sends congestion indicating message to node 1 (being source node), after node 1 is received congestion indicating message, reduces data forwarding speed, finally reaches to reduce congested purpose.
The congested response time of the congestion control policy of hop-by-hop is short, can eliminate the congested of bottleneck link rapidly; The congestion control policy of multi-hop slows down congested by the transmission rate that directly reduces source node, can not cause the congested of upstream node.
Embodiment three provides a kind of system of error control.
It will be appreciated by those skilled in the art that this system can be the system of plurality of sets one-tenth, also can be that an independent device constitutes.The device that constitutes this congested system can be portable terminal, fixed terminal, PDA, base station etc.
The accuracy control system that embodiment three provides with reference to figure 6, comprising: message detection module 601, be used for whether mistake of detection messages, and optionally send the message error message to the communication link judge module; Communication link judge module 602 is used for receiving the message error message from the message detection module, judges whether communication link is continuous; Error control decision-making module 603 is used for receiving the judged result from the communication link judge module, and according to the judged result of communication link judge module, the decision-making error control mechanism; Error Control module 604 is used for receiving the control indication from the error control decision-making module, and indicates according to the control of error control decision-making module, carries out corresponding error control.
Preferably, Error Control module comprises the Error Control module 607 of Error Control module 606, hop-by-hop and the Error Control module 608 of multi-hop end to end.The error control decision-making module is according to the judged result of communication link judge module, and the decision-making error control mechanism is specially: if communication link is continuous, then send the control indication to Error Control module end to end or to the Error Control module of hop-by-hop; If communication link is discontinuous, then indicate to the Error Control module of multi-hop or to the Error Control module transmission control of hop-by-hop; The Error Control module of end-to-end Error Control module or hop-by-hop or the Error Control module of multi-hop are carried out error control according to the control indication.
Preferably, this embodiment also comprises error rate judge module 605, is used to judge the communication link error rate; Then the error control decision-making module further is used for receiving from the judged result of communication link judge module with from the judged result of the communication link error rate of error rate judge module, and according to from the judged result of communication link judge module and the judged result of the communication link error rate, the decision-making error control mechanism.Preferably, Error Control module comprises the Error Control module of Error Control module, hop-by-hop and the Error Control module of multi-hop end to end; Wherein the error control decision-making module is according to the judged result of communication link judge module and the judged result of the communication link error rate, the decision-making error control mechanism is specially: if link is continuous, and if the error rate is lower than threshold value, to the control of Error Control module transmission end to end indication; If the error rate is not less than threshold value, to the Error Control module transmission control indication of hop-by-hop; If link is discontinuous, and if the error rate is lower than threshold value, to the Error Control module transmission control indication of multi-hop.The Error Control module of the Error Control module of Error Control module or hop-by-hop or multi-hop is carried out error control according to the control indication end to end.Certainly the error control decision-making module can have multiple condition for the comparison Rule of judgment of the error rate and threshold value, and present embodiment is not given an example one by one.
" reception " speech among this embodiment can be understood as and initiatively obtains from other modules also can be to receive the information that other modules are sent.Above-mentioned module can be distributed in a device, also can be distributed in multiple arrangement.Above-mentioned module can be merged into a module, also can further split into a plurality of submodules.
It will be appreciated by those skilled in the art that Fig. 6 is the schematic diagram of a preferred embodiment, the module among Fig. 6 might not be that enforcement the present invention is necessary.
Embodiment four provides a kind of system of congested control
Can be understood as this system and can be the system of plurality of sets one-tenth, also can be that an independent device constitutes.The device that constitutes this congested system can be portable terminal, fixed terminal, PDA, base station etc.
A kind of congestion control system that embodiment four provides with reference to figure 7, comprising: congestion detection module 701, and whether congested, optionally send link congestion information to the communication link judge module if being used for detecting communication link; Communication link judge module 702 is used for receiving the link congestion information from the congestion detection module, judges whether communication link is continuous; Congested control decision module 703 is used for receiving the judged result from the communication link judge module, and according to the judged result from the communication link judge module, the decision-making congestion control mechanism; Congested control module 704 is used for receiving the control indication from congested control decision module, and indicates according to the control of congested control decision module, carries out corresponding congested control.
Preferably, congested control module comprises the congested control module 707 of congested end to end control module 706, hop-by-hop and the congested control module 708 of multi-hop; Wherein congested control decision module is according to the judged result of communication link judge module, and the decision-making congestion control mechanism is specially: if communication link is continuous, then send the control indication to congested control module end to end or to the congested control module of hop-by-hop; If communication link is discontinuous, then indicate to the congested control module of multi-hop or to the congested control module transmission control of hop-by-hop; The congested control module of end-to-end congested control module or hop-by-hop or the congested control module of multi-hop are carried out congested control according to the control indication.
Preferably, link bandwidth judge module 705 is used to judge the variable quantity of link bandwidth in the unit interval; Congested control decision module, be used for receiving from the judged result of communication link judge module and the judged result of link bandwidth judge module, and according to the judged result of communication link judge module and the judged result of link bandwidth judge module, the decision-making congestion control mechanism: preferred, congested control module comprises the congested control module of congested end to end control module, hop-by-hop and the congested control module of multi-hop; Wherein congested control decision module is according to the judged result of communication link judge module and the judged result of link bandwidth judge module, the decision-making congestion control mechanism is specially: if link is continuous, and if the link bandwidth variable quantity is not higher than threshold value in the unit interval, to congested control module transmission control indication end to end; If the link bandwidth variable quantity is higher than threshold value in the unit interval, to the congested control module transmission control indication of hop-by-hop; If link is discontinuous, and if the link bandwidth variable quantity is not higher than threshold value in the unit interval, to the congested control module transmission control indication of multi-hop.The congested control module of congested end to end control module or hop-by-hop or the congested control module of multi-hop are carried out congested control according to the control indication.Certain congested control decision module can have multiple condition for the comparison Rule of judgment of link bandwidth variable quantity and threshold value in the unit interval, and present embodiment is not given an example one by one.
Preferably, the congestion detection module comprises:
Formation detection module 709: whether being used for average occupancy according to formation, to detect communication link congested; If for example the average occupancy of formation is greater than the average occupancy thresholding of formation, it is congested to judge that then link takes place, otherwise judges that link does not take place congested.Certainly the comparison Rule of judgment of the average occupancy thresholding of the average occupancy of formation and formation can have multiple condition, and present embodiment is not given an example one by one.Further can comprise the average occupancy computing module 712 of formation, be used for average occupancy according to following algorithm computation formation:
S new＝a·S old+(1-a)·S temp
Wherein, S NewBe the average occupancy of formation to be calculated, S OldBe the average occupancy of the formation that had before calculated, the average occupancy of once calculating before " before " can refer to herein of formation also can refer to previous any average occupancy of once calculating of formation, S TempFor the instantaneous occupancy of formation, every regular hour t, the occupancy of formation is added up, and give S the statistical value assignment Temp, α is the smoothing factor of queue occupancy.
Perhaps
Whether average service time detection module 710: it is congested to be used for detecting communication link according to the average service time that the MAC layer data is divided into groups; If for example the average service time of MAC layer data grouping is greater than the average service time thresholding of MAC layer data grouping, it is congested to judge that then link takes place, otherwise judges that link does not take place congested.Certainly the comparison Rule of judgment of the average service time thresholding of the average service time of MAC layer data grouping and the grouping of MAC layer data can have multiple condition, and present embodiment is not given an example one by one.Further can comprise average service time computing module 713, be used for average service time according to following algorithm computation MAC layer data grouping:
T new＝β·T old+(1-β)·T temp
Wherein, T NewBe the average service time of MAC layer data grouping to be calculated, T OldBe the average service time that the MAC layer data that had before calculated is divided into groups, the average service time of the MAC layer data of once calculating before " before " can refer to herein grouping also can refer to the average service time that previous any MAC layer data of once calculating is divided into groups, T TempFor the MAC layer is given the service time of given data packet, the MAC layer is every successfully to send a data grouping, and be T the service time of calculating it Temp, β is the smoothing factor of queue occupancy.
Whether average collision probability detection module 711: it is congested to be used for detecting communication link according to the average collision probability that the MAC layer divides into groups; If for example the average collision probability of MAC layer grouping is greater than the average collision probability thresholding of MAC layer grouping, it is congested to judge that then link takes place, otherwise judges that link does not take place congested.Certainly the comparison Rule of judgment of the average collision probability thresholding of the average collision probability of MAC layer grouping and the grouping of MAC layer can have multiple condition, and present embodiment is not given an example one by one.
Further can comprise average collision probability computing module 714, be used for average collision probability according to following algorithm computation MAC layer grouping:
P new＝λ·P old+(1-γ)·P temp
P NewBe the average collision probability of MAC layer grouping to be calculated, P OldBe the average collision probability that the MAC layer that had before calculated divides into groups, the average collision probability of the MAC layer that once calculates before " before " can refer to herein grouping also can refer to the average collision probability that previous any MAC layer that once calculates divides into groups, P TempFor the sample value of MAC layer packet collisions probability, every regular hour t, send the collision probability of grouping in the timing statistics t, promptly use collision frequency divided by total transmission number of times, and give P the statistical value assignment Temp, γ is the smoothing factor of packet collisions probability.
" reception " speech among this embodiment can be understood as and initiatively obtains from other modules also can be to receive the information that other modules are sent.Above-mentioned module can be distributed in a device, also can be distributed in multiple arrangement.Above-mentioned module can be merged into a module, also can further split into a plurality of submodules.
It will be appreciated by those skilled in the art that Fig. 7 is the schematic diagram of a preferred embodiment, the module among Fig. 7 might not be that enforcement the present invention is necessary.
The invention described above embodiment sequence number is not represented the quality of embodiment just to description.
The scheme of the content record of claim also is the protection range of the embodiment of the invention.
One of ordinary skill in the art will appreciate that all or part of processing in the foregoing description method is to instruct relevant hardware to finish by program, described program can be stored in a kind of computer-readable recording medium.
The above is preferred embodiment of the present invention only, is not to be used to limit protection scope of the present invention.Within the spirit and principles in the present invention all, any modification of being done, be equal to replacement, improvement etc., all should be included within protection scope of the present invention.

Claims (22)

1、一种差错控制方法，其特征在于，该方法包括：1. An error control method, characterized in that the method comprises: 检测到报文错误，判断通信链路是否连续，根据通信链路是否连续的判断结果采用不同的差错控制机制。When a message error is detected, it is judged whether the communication link is continuous, and different error control mechanisms are adopted according to the judgment result of whether the communication link is continuous. 2、如权利要求1所述的方法，其特征在于，2. The method of claim 1, wherein: 所述根据通信链路是否连续的判断结果采用不同的差错控制机制具体为：The different error control mechanisms adopted according to the judgment result of whether the communication link is continuous are as follows: 如果通信链路连续，采用端到端的差错控制或者逐跳的差错控制；If the communication link is continuous, use end-to-end error control or hop-by-hop error control; 如果通信链路是不连续，采用多跳差错控制或者采用逐跳的差错控制。If the communication link is discontinuous, use multi-hop error control or use hop-by-hop error control. 3、如权利要求1所述的方法，其特征在于，该方法进一步包括：3. The method of claim 1, further comprising: 判断通信链路误码率，根据通信链路是否连续的判断结果和通信链路误码率的判断结果采用不同的差错控制机制。To judge the bit error rate of the communication link, different error control mechanisms are adopted according to the judging result of whether the communication link is continuous or not and the judging result of the bit error rate of the communication link. 4、如权利要求3所述的方法，其特征在于，4. The method of claim 3, wherein: 所述根据通信链路是否连续的判断结果和通信链路误码率的判断结果采用不同的差错控制机制具体为：According to the judgment result of whether the communication link is continuous and the judgment result of the bit error rate of the communication link, different error control mechanisms are adopted to be specifically: 如果链路是连续的，而且若误码率低于门限值，采用端到端的差错控制方法；If the link is continuous, and if the bit error rate is lower than the threshold, an end-to-end error control method is used; 如果误码率不低于门限值，采用逐跳的差错控制；If the bit error rate is not lower than the threshold value, adopt hop-by-hop error control; 如果链路是不连续的，而且若误码率低于门限值，采用多跳的差错控制。If the link is discontinuous, and if the bit error rate is lower than the threshold value, multi-hop error control is adopted. 5、一种拥塞控制方法，其特征在于，该方法包括：5. A congestion control method, characterized in that the method comprises: 检测到通信链路拥塞，判断通信链路是否连续，根据通信链路是否连续的判断结果采用不同的拥塞控制机制。Detecting communication link congestion, judging whether the communication link is continuous, and adopting different congestion control mechanisms according to the judging result of whether the communication link is continuous. 6、如权利要求5所述的方法，其特征在于，6. The method of claim 5, wherein: 所述根据通信链路是否连续的判断结果采用不同的拥塞控制机制具体为：The different congestion control mechanisms adopted according to the judgment result of whether the communication link is continuous are as follows: 如果通信链路连续，采用端到端的拥塞控制或者逐跳的拥塞控制；If the communication link is continuous, use end-to-end congestion control or hop-by-hop congestion control; 如果通信链路是不连续，采用多跳拥塞控制或者采用逐跳的拥塞控制。If the communication link is discontinuous, use multi-hop congestion control or use hop-by-hop congestion control. 7、如权利要求5所述的方法，其特征在于，该方法进一步包括：7. The method of claim 5, further comprising: 判断单位时间内链路带宽变化量，根据通信链路是否连续的判断结果和单位时间内链路带宽变化量的判断结果采用不同的拥塞控制机制。Judging the link bandwidth variation per unit time, adopting different congestion control mechanisms according to the judging result of whether the communication link is continuous or not and the judging result of the link bandwidth variation per unit time. 8、如权利要求7所述的方法，其特征在于，8. The method of claim 7, wherein: 所述根据通信链路是否连续的判断结果和单位时间内链路带宽变化量的判断结果采用不同的拥塞控制机制具体为：According to the judging result of whether the communication link is continuous and the judging result of the link bandwidth variation per unit time, different congestion control mechanisms are used specifically as follows: 如果链路是连续的，而且若单位时间内链路带宽变化量不高于门限值，采用端到端的拥塞控制方法；If the link is continuous, and if the link bandwidth change per unit time is not higher than the threshold value, use the end-to-end congestion control method; 如果单位时间内链路带宽变化量高于门限值，采用逐跳的拥塞控制；If the change in link bandwidth per unit time is higher than the threshold, use hop-by-hop congestion control; 如果链路是不连续的，而且单位时间内链路带宽变化量不高于门限值，采用多跳的拥塞控制。If the link is discontinuous and the change in link bandwidth per unit time is not higher than the threshold, multi-hop congestion control is used. 9、如权利要求5到8任一项所述的方法，其特征在于，9. A method as claimed in any one of claims 5 to 8, characterized in that, 检测通信链路拥塞的方法为：The methods for detecting communication link congestion are: 根据队列的平均占用率或者根据MAC层数据分组的平均服务时间或者根据MAC层分组的平均碰撞概率进行检测通信链路拥塞。The communication link congestion is detected according to the average occupancy rate of the queue or according to the average service time of the MAC layer data packets or according to the average collision probability of the MAC layer packets. 10、如权利要求9所述的方法，其特征在于，所述检测通信链路拥塞的方法具体为：10. The method according to claim 9, wherein the method for detecting communication link congestion is specifically: 如果队列的平均占用率大于队列的平均占用率门限，或者如果MAC层数据分组的平均服务时间大于MAC层数据分组的平均服务时间门限，或者如果MAC层分组的平均碰撞概率大于MAC层分组的平均碰撞概率门限，则链路发生拥塞，否则链路没有发生拥塞。If the average occupancy rate of the queue is greater than the average occupancy threshold of the queue, or if the average service time of the MAC layer data packets is greater than the average service time threshold of the MAC layer data packets, or if the average collision probability of the MAC layer packets is greater than the average Collision probability threshold, the link is congested, otherwise the link is not congested. 11、如权利要求10所述的方法，其特征在于，11. The method of claim 10, wherein: 所述队列的平均占用率的计算方法为：The calculation method of the average occupancy rate of the queue is: Snew＝a·Sold+(1-a)·Stemp S new ＝a·S old +(1-a)·S temp 其中，Snew为待计算的队列的平均占用率，Sold为先前计算得到的队列平均占用率，Stemp为队列的瞬时占用率，每隔一定的时间t，对队列的占用率进行统计，并将统计值赋值给Stemp，α为队列占用率的平滑因子。Among them, S new is the average occupancy rate of the queue to be calculated, S old is the average occupancy rate of the queue calculated previously, S temp is the instantaneous occupancy rate of the queue, and the occupancy rate of the queue is counted every certain time t, And the statistical value is assigned to S temp , and α is the smoothing factor of the queue occupancy rate. 12、如权利要求10所述的方法，其特征在于，12. The method of claim 10, wherein: MAC层数据分组的平均服务时间为从MAC层接收到数据分组到该数据分组被成功发送的平均时间；The average service time of a MAC layer data packet is the average time from when the MAC layer receives the data packet to when the data packet is successfully sent; MAC层数据分组的平均服务时间为：The average service time of MAC layer data packets is: Tnew＝β·Told+(1-β)·Ttemp T new ＝β·T old +(1-β)·T temp 其中，Tnew为待计算的MAC层数据分组的平均服务时间，Told为先前计算得到的MAC层数据分组的平均服务时间，Ttemp为MAC层给定数据分组的服务时间，MAC层每成功发送一个数据分组，计算它的服务时间为Ttemp，β为队列占用率的平滑因子。Among them, T new is the average service time of the MAC layer data packet to be calculated, T old is the average service time of the previously calculated MAC layer data packet, and T temp is the service time of the given data packet of the MAC layer. Send a data packet, calculate its service time as T temp , and β is the smoothing factor of the queue occupancy rate. 13、如权利要求10所述的方法，其特征在于，13. The method of claim 10, wherein: MAC层分组的平均碰撞概率的计算方法为：The calculation method of the average collision probability of MAC layer packets is: Pnew＝λ·Pold+(1-γ)·Ptemp P new = λ·P old +(1-γ)·P temp Pnew为待计算的MAC层分组的平均碰撞概率，Pold为先前计算得到的MAC层分组的平均碰撞概率，Ptemp为MAC层分组碰撞概率的样本值，每隔一定的时间t，统计时间t内发送分组的碰撞概率，即用碰撞次数除以总的发送次数，并将统计值赋值给Ptemp，γ为分组碰撞概率的平滑因子。P new is the average collision probability of MAC layer packets to be calculated, P old is the average collision probability of MAC layer packets previously calculated, P temp is the sample value of MAC layer packet collision probability, every certain time t, statistical time The collision probability of packets sent within t is to divide the number of collisions by the total number of sendings, and assign the statistical value to P temp , where γ is the smoothing factor of the packet collision probability. 14、一种差错控制系统，其特征在于，包括：14. An error control system, characterized in that it comprises: 报文检测模块，用来检测报文是否错误；The message detection module is used to detect whether the message is wrong; 通信链路判断模块，用来接收来自报文检测模块的报文错误信息，判断通信链路是否连续；The communication link judging module is used for receiving message error information from the message detecting module, and judging whether the communication link is continuous; 差错控制决策模块，用来接收来自通信链路判断模块的判断结果，并且根据通信链路判断模块的判断结果，决策差错控制机制；The error control decision-making module is used to receive the judgment result from the communication link judgment module, and decides the error control mechanism according to the judgment result of the communication link judgment module; 差错控制模块，用来接收来自差错控制决策模块的控制指示，并根据差错控制决策模块的控制指示，进行相应的差错控制。The error control module is used to receive the control instruction from the error control decision-making module, and perform corresponding error control according to the control instruction of the error control decision-making module. 15、如权利要求14所述的差错控制系统，其特征在于，15. The error control system of claim 14, wherein: 差错控制模块包括端到端的差错控制模块、逐跳的差错控制模块和多跳的差错控制模块；The error control module includes end-to-end error control module, hop-by-hop error control module and multi-hop error control module; 所述差错控制决策模块根据通信链路判断模块的判断结果，决策差错控制机制具体为：According to the judgment result of the communication link judgment module, the error control decision-making module, the decision-making error control mechanism is specifically: 如果通信链路连续，则向端到端的差错控制模块或者向逐跳的差错控制模块发送控制指示；If the communication link is continuous, send a control instruction to the end-to-end error control module or to the hop-by-hop error control module; 如果通信链路是不连续，则向多跳的差错控制模块或者向逐跳的差错控制模块发送控制指示；If the communication link is discontinuous, send a control instruction to a multi-hop error control module or to a hop-by-hop error control module; 端到端差错控制模块或逐跳的差错控制模块或多跳的差错控制模块根据控制指示进行差错控制。The end-to-end error control module or the hop-by-hop error control module or the multi-hop error control module performs error control according to the control instruction. 16、如权利要求14所述的差错控制系统，其特征在于，包括16. The error control system of claim 14, comprising 误码率判断模块，用于判断通信链路误码率；A bit error rate judging module, used for judging the bit error rate of the communication link; 差错控制决策模块，用来接收来自通信链路判断模块的判断结果和来自误码率判断模块的通信链路误码率的判断结果，并根据来自通信链路判断模块的判断结果和通信链路误码率的判断结果，决策差错控制机制。The error control decision-making module is used to receive the judgment result from the communication link judging module and the judging result of the bit error rate of the communication link from the bit error rate judging module, and according to the judging result from the communication link judging module and the communication link Judgment result of bit error rate, decision-making error control mechanism. 17、如权利要求16所述的差错控制系统，其特征在于，包括17. The error control system of claim 16, comprising 差错控制模块包括端到端的差错控制模块、逐跳的差错控制模块和多跳的差错控制模块；The error control module includes end-to-end error control module, hop-by-hop error control module and multi-hop error control module; 所述差错控制决策模块根据通信链路判断模块的判断结果和通信链路误码率的判断结果，决策差错控制机制具体为：According to the judgment result of the communication link judgment module and the judgment result of the bit error rate of the communication link, the error control decision-making module of the error control decision-making module is specifically: 如果链路是连续的，而且若误码率低于门限值，向端到端的差错控制模块发送控制指示；If the link is continuous, and if the bit error rate is lower than the threshold value, send a control instruction to the end-to-end error control module; 如果误码率不低于门限值，向逐跳的差错控制模块发送控制指示；If the bit error rate is not lower than the threshold value, send a control instruction to the hop-by-hop error control module; 如果链路是不连续的，而且若误码率低于门限值，向多跳的差错控制模块发送控制指示；If the link is discontinuous, and if the bit error rate is lower than the threshold value, send a control instruction to the multi-hop error control module; 端到端的差错控制模块或逐跳的差错控制模块或多跳的差错控制模块根据控制指示进行差错控制。The end-to-end error control module or the hop-by-hop error control module or the multi-hop error control module performs error control according to the control instructions. 18、一种拥塞控制系统，其特征在于，包括：18. A congestion control system, comprising: 拥塞检测模块，用来检测通信链路是否拥塞；Congestion detection module, used to detect whether the communication link is congested; 通信链路判断模块，用来接收来自拥塞检测模块的链路拥塞信息，判断通信链路是否连续；The communication link judgment module is used to receive the link congestion information from the congestion detection module, and judge whether the communication link is continuous; 拥塞控制决策模块，用来接收来自通信链路判断模块的判断结果，并且根据来自通信链路判断模块的判断结果，决策拥塞控制机制；The congestion control decision-making module is used to receive the judgment result from the communication link judgment module, and decides the congestion control mechanism according to the judgment result from the communication link judgment module; 拥塞控制模块，用来接收来自拥塞控制决策模块的控制指示，并根据拥塞控制决策模块的控制指示，进行相应的拥塞控制机制。The congestion control module is used to receive the control instruction from the congestion control decision-making module, and perform corresponding congestion control mechanism according to the control instruction of the congestion control decision-making module. 19、如权利要求18所述的拥塞控制系统，其特征在于，19. The congestion control system of claim 18, wherein: 拥塞控制模块包括端到端的拥塞控制模块、逐跳的拥塞控制模块和多跳的拥塞控制模块；The congestion control module includes an end-to-end congestion control module, a hop-by-hop congestion control module and a multi-hop congestion control module; 所述拥塞控制决策模块根据通信链路判断模块的判断结果，决策拥塞控制机制具体为：According to the judgment result of the communication link judgment module, the congestion control decision-making module determines the congestion control mechanism specifically as follows: 如果通信链路连续，则向端到端的拥塞控制模块或者向逐跳的拥塞控制模块发送控制指示；If the communication link is continuous, send a control instruction to the end-to-end congestion control module or to the hop-by-hop congestion control module; 如果通信链路是不连续，则向多跳的拥塞控制模块或者向逐跳的拥塞控制模块发送控制指示；If the communication link is discontinuous, send a control instruction to the multi-hop congestion control module or to the hop-by-hop congestion control module; 端到端拥塞控制模块或逐跳的拥塞控制模块或多跳的拥塞控制模块根据控制指示进行拥塞控制。The end-to-end congestion control module or the hop-by-hop congestion control module or the multi-hop congestion control module performs congestion control according to the control instruction. 20、如权利要求18所述的拥塞控制系统，其特征在于，包括20. The congestion control system of claim 18, comprising 链路带宽判断模块，用于判断单位时间内链路带宽的变化量；The link bandwidth judging module is used to judge the amount of change of the link bandwidth per unit time; 拥塞控制决策模块，用来接收来自通信链路判断模块的判断结果和链路带宽判断模块的判断结果，并根据通信链路判断模块的判断结果和链路带宽判断模块的判断结果，决策拥塞控制机制：The congestion control decision-making module is used to receive the judgment result from the communication link judgment module and the judgment result of the link bandwidth judgment module, and decide congestion control according to the judgment result of the communication link judgment module and the judgment result of the link bandwidth judgment module mechanism: 21、如权利要求20所述的拥塞控制系统，其特征在于，包括21. The congestion control system of claim 20, comprising 拥塞控制模块包括端到端的拥塞控制模块、逐跳的拥塞控制模块和多跳的拥塞控制模块；The congestion control module includes an end-to-end congestion control module, a hop-by-hop congestion control module and a multi-hop congestion control module; 所述拥塞控制决策模块根据通信链路判断模块的判断结果和链路带宽判断模块的判断结果，决策拥塞控制机制具体为：According to the judgment result of the communication link judgment module and the judgment result of the link bandwidth judgment module, the congestion control decision-making module of the described congestion control mechanism is specifically: 如果链路是连续的，而且若单位时间内链路带宽变化量不高于门限值，向端到端的拥塞控制模块发送控制指示；If the link is continuous, and if the change in link bandwidth per unit time is not higher than the threshold value, send a control instruction to the end-to-end congestion control module; 如果单位时间内链路带宽变化量高于门限值，向逐跳的拥塞控制模块发送控制指示；If the link bandwidth variation per unit time is higher than the threshold value, send a control instruction to the hop-by-hop congestion control module; 如果链路是不连续的，而且若单位时间内链路带宽变化量不高于门限值，向多跳的拥塞控制模块发送控制指示；If the link is discontinuous, and if the link bandwidth variation per unit time is not higher than the threshold value, send a control instruction to the multi-hop congestion control module; 端到端的拥塞控制模块或逐跳的拥塞控制模块或多跳的拥塞控制模块根据控制指示进行拥塞控制。The end-to-end congestion control module or the hop-by-hop congestion control module or the multi-hop congestion control module performs congestion control according to the control instruction. 22、如权利要求18至21任一项所述的拥塞控制系统，其特征在于，拥塞检测模块包括：22. The congestion control system according to any one of claims 18 to 21, wherein the congestion detection module includes: 队列检测模块：用来根据队列的平均占用率来检测通信链路是否拥塞；Queue detection module: used to detect whether the communication link is congested according to the average occupancy rate of the queue; 或者or 平均服务时间检测模块：用来根据MAC层数据分组的平均服务时间来检测通信链路是否拥塞；Average service time detection module: used to detect whether the communication link is congested according to the average service time of the MAC layer data packets; 平均碰撞概率检测模块：用来根据MAC层分组的平均碰撞概率来检测通信链路是否拥塞。Average collision probability detection module: used to detect whether the communication link is congested according to the average collision probability of MAC layer packets.
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