CN105024941A - Multi-priority multichannel MAC protocol self-adaptive jitter method and system - Google Patents
Multi-priority multichannel MAC protocol self-adaptive jitter method and system Download PDFInfo
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- CN105024941A CN105024941A CN201510304569.1A CN201510304569A CN105024941A CN 105024941 A CN105024941 A CN 105024941A CN 201510304569 A CN201510304569 A CN 201510304569A CN 105024941 A CN105024941 A CN 105024941A
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L47/00—Traffic control in data switching networks
- H04L47/10—Flow control; Congestion control
- H04L47/23—Bit dropping
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L47/00—Traffic control in data switching networks
- H04L47/10—Flow control; Congestion control
- H04L47/24—Traffic characterised by specific attributes, e.g. priority or QoS
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L47/00—Traffic control in data switching networks
- H04L47/10—Flow control; Congestion control
- H04L47/27—Evaluation or update of window size, e.g. using information derived from acknowledged [ACK] packets
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L47/00—Traffic control in data switching networks
- H04L47/10—Flow control; Congestion control
- H04L47/28—Flow control; Congestion control in relation to timing considerations
- H04L47/283—Flow control; Congestion control in relation to timing considerations in response to processing delays, e.g. caused by jitter or round trip time [RTT]
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L47/00—Traffic control in data switching networks
- H04L47/50—Queue scheduling
- H04L47/62—Queue scheduling characterised by scheduling criteria
- H04L47/6245—Modifications to standard FIFO or LIFO
Abstract
A multi-priority multichannel MAC protocol self-adaptive jitter method of the invention comprises the following steps: 1, business packet data arriving at a network layer is sent to buffer queues of corresponding channels to undergo queuing according to priority levels: 2, packet data is taken out from the buffer queues and divided into N burst data packets; 3, before sending of each burst data packet, the size of a jitter window is determined according to the priority level and a jitter phase where the burst data packet is and the jitter phase transfer probability p of the burst data packet; 4, a jitter process of the burst data packet is completed according to the determined size of the jitter window at randomly selected jitter time; a channel frequency point is randomly selected from in a concentrated mode in channels to perform sending; and 5, the quantity of the burst data packets in each channel in a segment of time is subjected to statistical analysis; quantification expression is carried out on a network load to be regarded as a basis for setting of a transfer probability p. According to the invention, low time-delay and high reliability of high priority grouping are guaranteed, and the method is applicable to providing different QoS for different business priority degrees.
Description
Technical field
The invention belongs to communication technical field, relate to a kind of constructing communication network method, be specifically related to a kind of multipriority multi-channel MAC protocols adaptive jitter method of load feedback Network Based.
Background technology
Aeronautical communications network system needs the Capability Requirement of networked coordination of low time delay, distributed, self-organizing when performing some task, have that time-constrain is strict, high, the multitask coordinated parallel characteristic of information interaction quality requirement, therefore very high requirement is proposed to the information interaction sharing capability of network system.In order to meet the Capability Requirement of distributed, low time delay, self-organizing, the general architectural framework adopting Ad hoc network.Wherein, MAC protocol, as the primary study content of aviation Ad hoc network, mainly to solve between multiple node the problem of how efficient shared communication channel, directly affects ageing, reliability, throughput of system and the dynamic group net ability of system.Current typical military aviation communications network system, U.S. army Link11 Data-Link uses polling mechanism MAC protocol, the TDMA agreement that Link-16 Data-Link uses, only could communicate in the polling time slot planned in advance or distribute in time slot, exist end-to-end time delay greatly, extensibility and the shortcoming such as survivability is poor.Link22 adopts dynamic TDMA mechanism, is provided with certain flexibility and autgmentability, and the time delay that information transmission is shared, generally in level second, is difficult to the Millisecond propagation delay time requirement meeting air communications chronesthesy business.Based on the MAC protocol of CSMA mechanism, for solving the problem of concealed terminal and exposed terminal, RTS/CTS control frame generally to be adopted to carry out alternately, when aviation large scale propagation delay is larger, be difficult to the Millisecond delay requirement meeting some urgency traffic.
Summary of the invention
Goal of the invention of the present invention is a kind of multipriority multi-channel MAC protocols adaptive jitter method providing load feedback Network Based, solve aviation Ad hoc network differentiated service priority service, and strict ageing and guaranteed reliability can be provided for highest priority traffic, solve the problem of penalty during Stochastic accessing class MAC protocol heavy duty simultaneously.
Goal of the invention of the present invention is achieved through the following technical solutions:
A kind of multipriority multi-channel MAC protocols adaptive jitter method, comprises following steps:
Step 1: k bar channel is set according to priority-level number k, business grouping data network layer arrived according to priority rank is sent into the buffer queue of respective channel and is ranked;
Step 2: take out grouped data from buffer queue, adopts the Turbo of 1/3 efficiency coding to carry out error correction coding to the grouped data of taking out, the grouped data after error correction coding is split as N number of burst packet; Wherein comprise the identification information of grouping serial number and packet sequence number in each burst packet;
Step 3: before sending, the priority-level residing for burst packet and shake stage and shake stage transition probability p determine the size of jitter window to each burst packet;
Step 4: burst packet completes dither process according to the jitter window size Stochastic choice shaky time determined, in channel set, Stochastic choice channel frequency sends;
Step 5: the quantity of the burst packet in statistics a period of time on each channel, carries out quantization means to offered load, as the installation warrants of shake stage transition probability p.
According to above-mentioned feature, the queue discipline of described buffer queue is first-in first-out, if buffer queue is full, then directly abandons grouped data.
According to above-mentioned feature, the determination of described jitter window size comprises following steps:
A) jitter window size is divided into m grade stage, if the jitter window value Cwin in the 1st grade stage is minimum, the jitter window value in m grade stage is m Cwin, the burst packet of limit priority is only in the 1st grade stage, the burst packet of secondary limit priority is in the 1st and the 2nd grade stage, the burst packet jitter level stage of a kth priority is in the 1st to a kth grade stage, can only shift between the stage between adjacent phases;
If b) the shake stage of current burst packet pending is less than the maximum jitter stage of priority belonging to burst packet, stage of then shaking moves a shake stage after shaking stage transition probability p, or moves forward a shake stage with 1-shake stage transition probability p;
If c) the shake stage of current burst packet pending equals the minimum jitter stage of priority belonging to burst packet, stage of then shaking moves a shake stage after shaking stage transition probability p, or rests on the current dither stage with 1-shake stage transition probability p;
If d) the shake stage of current burst packet pending equals the maximum jitter stage of priority belonging to burst packet, stage of then shaking rests on the current dither stage to shake stage transition probability p, or moves forward a shake stage with 1-shake stage transition probability p.
Another object of the present invention is to provide the system realizing multipriority multi-channel MAC protocols adaptive jitter method, comprise the k bar channel, channel occupancy statistical module, the packet recombining module that arrange according to priority, in each channel, comprise FIFO queue module, burst generation module, adaptive jitter module.
Described FIFO queue module is used for providing buffer queue for the grouped data of respective priority;
Burst generation module is used for taking out grouped data from buffer queue, first the grouped data of taking out is carried out to the Turbo error correction coding of 1/3 efficiency, then be split as several burst packet by isometric for the grouped data after error correction coding, in each burst packet, add the identification information comprising grouping serial number and packet sequence number;
Adaptive jitter module is used for each burst packet before sending, and the priority-level residing for burst packet and shake stage and shake stage transition probability p determine the size of jitter window; After determining jitter window size, Stochastic choice shaky time completes dither process, and then from frequency storehouse, Stochastic choice frequency passes through transmitter access network;
Described channel occupancy statistical module is for adding up the quantity of the burst packet in a period of time on each channel, quantization means is carried out to channel busy degree, the foundation that adaptive jitter module channel busy degree value being fed back to each priority is arranged as its shake stage transition probability.
Described packet recombining module is used for carrying out decoding restructuring according to identification information in the burst packet received to bursty data.
According to above-mentioned feature, described FIFO queue module according to the rule of first-in first-out by grouped data stored in buffer queue, if buffer queue is full, then directly abandon grouped data.
According to above-mentioned feature, described adaptive jitter module determines the size of jitter window by the two-dimensional state transition diagram that maintain a shake stage sum counter.
The present invention is as an important algorithm of aeronautical Ad hoc networks MAC protocol, for service with different priority levels provides, corresponding QoS ensures for each priority arranges the different maximum jitter stage to utilize adaptive jitter mechanism, and the feedback regulation effect of the self adaptation transition probability p provided by channel occupancy statistical module, agreement is made to possess business load adaptive ability, namely during underload, each priority service all can be efficient, reliable transmission, to sacrifice low priority traffice communication quality for cost during heavy duty, ensure that the low delay of high priority packet and highly reliable, be applicable to being applied to for different business top grade provides different QoS, and to the real-time of high-priority service and the very high air communications networking occasion of reliability requirement.
Accompanying drawing explanation
Fig. 1 is the framework of the multipriority multi-channel MAC protocols of load feedback Network Based;
Fig. 2 is MAC protocol state transition diagram;
Fig. 3 is the two-dimensional state transition diagram of adaptive jitter algorithm shake stage sum counter.
Embodiment
Below in conjunction with the drawings and specific embodiments, the present invention is described in detail.
The technical solution adopted in the present invention is a kind of multipriority multi-channel MAC protocols adaptive jitter method of load feedback Network Based, specifically implements according to following steps:
Step 1: k bar channel is set according to priority-level number k, business grouping data network layer arrived according to priority rank is sent into the buffer queue of respective channel and is ranked;
Step 2: take out grouped data from buffer queue, adopts the Turbo of 1/3 efficiency coding to carry out error correction coding to the grouped data of taking out, the grouped data after error correction coding is split as N number of burst packet; Wherein comprise the identification information of grouping serial number and packet sequence number in each burst packet;
Step 3: before sending, the priority-level residing for burst packet and shake stage and shake stage transition probability p determine the size of jitter window to each burst packet.
For preferentially ensureing real-time and the reliability of high-priority service.Jitter window size is divided into m grade stage, the jitter window value Cwin in the 1st grade stage is minimum, the jitter window value in m grade stage is m Cwin, highest priority traffic burst is only in the 1st grade stage, secondary highest priority traffic burst can be in the 1st and the 2nd grade stage, by that analogy, a kth priority jitter level stage can locate the 1st to a kth grade stage, can only shift between adjacent phases between stage, its shake stage transition probability is p, and this value is calculated by step 5 to be determined.
Fig. 2 is the state transition diagram of the multipriority multi-channel MAC protocols of offered load feedback, and each priority burst delay variation mechanism is run according to the state transitions policy independence of Fig. 2.After transmission bursty state and idle condition, as also having burst pending, then perform by following rule:
(1) if the current dither stage be less than maximum jitter stage of this priority, then shaking the stage is move a shake stage after the probability of p with probability, or move forward a shake stage with the probability of probability 1-p, corresponding jitter window doubles (moving afterwards) or reduces one times (reach).
(2) if the current dither stage equal minimum jitter stage of this priority, then shaking the stage is move a shake stage after the probability of p with probability, or rest on the current dither stage with the probability of probability 1-p, corresponding jitter window doubles (moving afterwards) or remain unchanged (stop).
(3) if the current dither stage equal maximum jitter stage of this priority, stage of then shaking is that the probability of p rests on the current dither stage with probability, or move forward a shake stage with the probability of probability 1-p, corresponding jitter window remains unchanged (stop) or double (reach).
(4), in jitter window after the adjustment, then Stochastic choice shaky time is burst Stochastic choice frequency access channel from frequency storehouse.
(5) after burst transmit, as also having burst pending, then continue to perform according to above-mentioned steps, otherwise enter idle condition.
Step 4: burst packet completes dither process according to the jitter window size Stochastic choice shaky time determined, in channel set, Stochastic choice channel frequency sends;
Step 5: the quantity of the burst packet in statistics a period of time on each channel, carries out quantization means to offered load, as the installation warrants of shake stage transition probability p.
As is shown in fig. 1, for realizing this multipriority multi-channel MAC protocols adaptive jitter method, the invention provides a kind of system, comprising FIFO queue module, burst generation module, adaptive jitter module, channel occupancy statistical module, packet recombining module.Their concrete function is respectively:
FIFO queue module: for each priority packet data provides the storage of limited capacity to cushion, grouped data is according to order of arrival successively stored in respective buffer queue, and buffering area is saturated, and this grouping abandons automatically.
Burst generation module: take out the head of the queue grouping in buffer queue, first grouping is carried out to the Turbo coding of 1/3 efficiency, then be isometricly split as several burst packet, in each burst packet, add respective identity identification information (comprising grouping serial number and packet sequence number).
Adaptive jitter module: each burst packet first carries out adaptive jitter before sending, the shake of each priority burst packet can executed in parallel and shake stage transition probability p is identical simultaneously, shake stage transition probability p value is upgraded by channel occupancy statistical module Real-time Feedback, and channel busy degree its value higher is larger.Unlike each priority maximum jitter stage, priority its maximum jitter stage lower is larger.Bursty data wraps on the current dither stage, respectively with certain shake stage transition probability p advance or after move a shake stage, under the jitter window that this shake stage is corresponding, Stochastic choice shaky time completes dither process, and then from frequency storehouse, Stochastic choice frequency passes through transmitter access network.
Channel occupancy statistical module: the amount of bursts in statistics a period of time on each channel, carries out quantization means to channel busy degree, this value is fed back to the foundation that each priority adaptive jitter module is arranged as its shake stage transition probability.
Packet recombining module: the identification information according to the burst packet received carries out decoding restructuring to it, according to Turbo coding principle, only successfully need receive burst over half and just successfully can recover grouping.
Fig. 3 is the two-dimensional state transition diagram of adaptive jitter algorithm shake stage sum counter.
In adaptive jitter algorithm, each priority service has the coincidence counter worked alone, and provides bursty jitter timing function.Network node is the two-dimensional state transition diagram that each priority service maintains a shake stage sum counter.As Fig. 3 be priority n (n=1,2,3 ...) the two-dimensional state transition diagram of shake stage sum counter, comprise 1 altogether, 2 ..., m is m shake stage altogether, and the maximum jitter stage m value of different priorities is different.In shake stage i (1≤i≤m), comprise 1,2 ..., W
iw altogether
iindividual count status, and W
ialong with the increase in shake stage linearly increases, W
i=iW
1.The transfer in shake stage can only be carried out between adjacent phases, and backward transition probability is p, and forward direction transition probability is (1-p).Counter status can only be moved by rear forwards between the same shake stage, often shifts forward once through a shake time slot δ counter status.
The adaptive jitter mechanism of different priorities burst can simultaneously independent operating, and when only arriving when happening suddenly, algorithm starts to start.Be only that the burst of n illustrates with priority: if current dither stage when burst arrives is i (1<i<m), burst is not shaken in this stage, but be move a shake stage after probability with p, move forward a shake stage with probability (1-p), both are exclusive events.If after move a shake stage, then the current dither stage becomes i+1.With probability 1/W
i+1at manifold [1, W
i+1] middle Stochastic choice integer is as counter initial value, when counter is 0, bursty jitter completes and accesses channel by the frequency of Stochastic choice.Next priority is that the burst pending of n has continued shake according to said process.
Be understandable that, for those of ordinary skills, can be equal to according to technical scheme of the present invention and inventive concept thereof and replace or change, and all these change or replace the protection range that all should belong to the claim appended by the present invention.
Claims (6)
1. a multipriority multi-channel MAC protocols adaptive jitter method, comprises following steps:
Step 1: k bar channel is set according to priority-level number k, business grouping data network layer arrived according to priority rank is sent into the buffer queue of respective channel and is ranked;
Step 2: take out grouped data from buffer queue, adopts the Turbo of 1/3 efficiency coding to carry out error correction coding to the grouped data of taking out, the grouped data after error correction coding is split as N number of burst packet; Wherein comprise the identification information of grouping serial number and packet sequence number in each burst packet;
Step 3: before sending, the priority-level residing for burst packet and shake stage and shake stage transition probability p determine the size of jitter window to each burst packet;
Step 4: burst packet completes dither process according to the jitter window size Stochastic choice shaky time determined, in channel set, Stochastic choice channel frequency sends;
Step 5: the quantity of the burst packet in statistics a period of time on each channel, carries out quantization means to offered load, as the installation warrants of shake stage transition probability p.
2. multipriority multi-channel MAC protocols adaptive jitter method according to claim 1, is characterized in that the queue discipline of described buffer queue is first-in first-out, if buffer queue is full, then directly abandons grouped data.
3. multipriority multi-channel MAC protocols adaptive jitter method according to claim 1, is characterized in that the determination of described jitter window size comprises following steps:
A) jitter window size is divided into m grade stage, if the jitter window value Cwin in the 1st grade stage is minimum, the jitter window value in m grade stage is mCwin, the burst packet of limit priority is only in the 1st grade stage, the burst packet of secondary limit priority is in the 1st and the 2nd grade stage, the burst packet jitter level stage of a kth priority is in the 1st to a kth grade stage, can only shift between the stage between adjacent phases;
If b) the shake stage of current burst packet pending is less than the maximum jitter stage of priority belonging to burst packet, stage of then shaking moves a shake stage after shaking stage transition probability p, or moves forward a shake stage with 1-shake stage transition probability p;
If c) the shake stage of current burst packet pending equals the minimum jitter stage of priority belonging to burst packet, stage of then shaking moves a shake stage after shaking stage transition probability p, or rests on the current dither stage with 1-shake stage transition probability p;
If d) the shake stage of current burst packet pending equals the maximum jitter stage of priority belonging to burst packet, stage of then shaking rests on the current dither stage to shake stage transition probability p, or moves forward a shake stage with 1-shake stage transition probability p.
4. one kind realizes the system of multipriority multi-channel MAC protocols adaptive jitter method according to claim 1, comprise the k bar channel, channel occupancy statistical module, the packet recombining module that arrange according to priority, comprise FIFO queue module, burst generation module, adaptive jitter module in each channel, it is characterized in that:
Described FIFO queue module is used for providing buffer queue for the grouped data of respective priority;
Described burst generation module is used for taking out grouped data from buffer queue, first the grouped data of taking out is carried out to the Turbo error correction coding of 1/3 efficiency, then be split as several burst packet by isometric for the grouped data after error correction coding, in each burst packet, add the identification information comprising grouping serial number and packet sequence number;
Described adaptive jitter module is used for each burst packet before sending, and the priority-level residing for burst packet and shake stage and shake stage transition probability p determine the size of jitter window; After determining jitter window size, Stochastic choice shaky time completes dither process, and then from frequency storehouse, Stochastic choice frequency passes through transmitter access network;
Described channel occupancy statistical module is for adding up the quantity of the burst packet in a period of time on each channel, quantization means is carried out to channel busy degree, the foundation that adaptive jitter module channel busy degree value being fed back to each priority is arranged as its shake stage transition probability;
Described packet recombining module is used for carrying out decoding restructuring according to identification information in the burst packet received to bursty data.
5. system according to claim 4, is characterized in that the rule of described FIFO queue module according to first-in first-out by grouped data stored in buffer queue, if buffer queue is full, then directly abandons grouped data.
6. system according to claim 4, is characterized in that described adaptive jitter module determines the size of jitter window by the two-dimensional state transition diagram that maintain a shake stage sum counter.
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| CN110535786A (en) * | 2019-07-24 | 2019-12-03 | 华为技术有限公司 | A kind of method and relevant device of data transmission |
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