CN105163265A - Method for scheduling resources in machine network - Google Patents

Method for scheduling resources in machine network Download PDF

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Publication number
CN105163265A
CN105163265A CN201510524051.9A CN201510524051A CN105163265A CN 105163265 A CN105163265 A CN 105163265A CN 201510524051 A CN201510524051 A CN 201510524051A CN 105163265 A CN105163265 A CN 105163265A
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China
Prior art keywords
communication
communication equipment
way
equipment
channel resource
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CN201510524051.9A
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Chinese (zh)
Inventor
张奇勋
冯志勇
郑婷婷
冯泽冰
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Beijing University of Posts and Telecommunications
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Beijing University of Posts and Telecommunications
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Priority to CN201510524051.9A priority Critical patent/CN105163265A/en
Publication of CN105163265A publication Critical patent/CN105163265A/en
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W74/00—Wireless channel access, e.g. scheduled or random access
    • H04W74/08—Non-scheduled or contention based access, e.g. random access, ALOHA, CSMA [Carrier Sense Multiple Access]
    • H04W74/0808—Non-scheduled or contention based access, e.g. random access, ALOHA, CSMA [Carrier Sense Multiple Access] using carrier sensing, e.g. as in CSMA
    • H04W74/0825—Non-scheduled or contention based access, e.g. random access, ALOHA, CSMA [Carrier Sense Multiple Access] using carrier sensing, e.g. as in CSMA carrier sensing with collision detection
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W74/00—Wireless channel access, e.g. scheduled or random access
    • H04W74/08—Non-scheduled or contention based access, e.g. random access, ALOHA, CSMA [Carrier Sense Multiple Access]
    • H04W74/0833—Non-scheduled or contention based access, e.g. random access, ALOHA, CSMA [Carrier Sense Multiple Access] using a random access procedure

Abstract

The invention discloses a method for scheduling resources in a machine type communication network. The method comprises the following steps that: machine type communication groups including one or more pieces of communication equipment are constructed, wherein different pieces of communication equipment in the same machine type communication group have the same communication priority; a base station partitions channel resources specific to different machine type communication groups, and transmits corresponding scheduling authorization to the machine type communication groups in order to allocate the channel resources to the machine type communication groups; the machine type communication groups process the received scheduling authorization to obtain corresponding channel resources; when the communication equipment initiates a communication request, the machine type communication groups make the communication equipment access the channel resources according to a specific rule; and the communication equipment accessing the channel resources transmits data to the base station. Compared with the prior art, the method has the advantages that signaling overhead during accessing of the communication equipment to the channel resources can be simplified; communication request collisions are avoided; and time delay is shortened.

Description

Resource regulating method in a kind of machine network
Technical field
The present invention relates to the communications field, relate to the resource regulating method in a kind of machine communication network specifically.
Background technology
Along with the research of the 5th generation communication progressively launches, between machine, interconnected communication presents rapid growth momentum, and machine communication is because having the feature different from traditional interpersonal communication, more and more becomes the focus of research.The now current research about machine communication mainly concentrates on the transmission of data in the management method of group, the paging of group and group.
But in the prior art, existing technology usually can access treatment circuit in machinery equipment thus estimate the size for the backoff window of the access signaling to radio net between self-adaptative adjustment access periods according to the loading of access.The overload problem that what this technology mainly solved is in machine communication, the access success rate of hoisting machine equipment.It mainly concentrates on machine communication (MachineTypeCommunication, the realization of management and group MTC) and the aspect such as transfer of data and paging, do not pay close attention to the delay problem of machine communication, do not consider that the communication of time delay sensitive type business realizes.
But along with the machine application development that the time delay sensitivities such as industrial detection, Emergency Assistance and disaster monitoring are high, reduce machine communication time delay and become the important guarantee carried out smoothly guaranteeing such business.
Therefore, for the delay problem of machine communication, need the resource regulating method in new a kind of machine communication network.
Summary of the invention
For the delay problem of machine communication, the invention provides the resource regulating method in a kind of machine communication network, said method comprising the steps of:
Machine communication group is constructed in described machine communication network, each described machine communication group comprises the one or more communication equipments in described machine communication network, and the different described communication equipment in same described machine communication group has same communication priority;
Base station in described machine communication network is split channel resource for different described machine communication groups, sends corresponding scheduling authorization to described machine communication group thus for described machine communication group allocation channel resource;
Described machine communication group processes the described scheduling authorization that receives thus obtains corresponding described channel resource;
When described communication equipment initiating communication request, described communication equipment is accessed described channel resource according to ad hoc rules by described machine communication group;
The described communication equipment accessing described channel resource sends data to described base station.
In one embodiment, accessing in the process of described channel resource by the described communication equipment in described machine communication group, the different described communication equipment in described machine communication group accesses described channel resource in the mode of competition.
In one embodiment, the different described communication equipment in described machine communication group accesses in the process of described channel resource in the mode of competition the communication request collision problem adopting avoidance mechanism to solve different described communication equipments.
In one embodiment, the process that described communication equipment accesses described channel resource comprises following steps:
What each described communication equipment when the communication request of different described communication equipments collides being that communication request collides distributed corresponding specific duration keeps out of the way window, wherein, distributes described in different duration keep out of the way window to different described communication equipments;
Initiating communication request again after corresponding duration kept out of the way by the described communication equipment keeping out of the way window described in being assigned with;
When the communication request of described communication equipment does not collide, the described communication equipment of initiating described communication request is accessed described channel resource.
In one embodiment, the process that described communication equipment accesses described channel resource comprises following steps:
When described communication equipment initiating communication request, described channel resource is in down state, that distributes corresponding specific duration for described communication equipment keeps out of the way window;
Initiating communication request again after corresponding duration kept out of the way by the described communication equipment keeping out of the way window described in being assigned with;
When described channel resource is in upstate when described communication equipment initiating communication request, the described communication equipment of initiating described communication request is accessed described channel resource.
In one embodiment, for the described communication equipment occurred in the multiple described communication equipment of described communication request collision distribute duration be zero keep out of the way window.
In one embodiment, if the multiple described communication equipment that the collision of described communication request occurs only comprises a described communication equipment having experienced to keep out of the way, for experience the described communication equipment kept out of the way distribute duration be zero keep out of the way window.
In one embodiment, if the multiple described communication equipment that the collision of described communication request occurs comprises multiplely experienced the described communication equipment kept out of the way, the described communication equipment keeping out of the way least number of times for experience distribute duration be zero keep out of the way window.
In one embodiment, keep out of the way described in distribution described in the different duration of stochastic generation in the process of window and keep out of the way window.
In one embodiment, take according to described channel resource the duration keeping out of the way window that slot length adjusts described communication equipment.
Compared with prior art, the signaling consumption of communication equipment access channel resource can be simplified according to method of the present invention, solve communication request and collide and shorten time delay.
Further feature of the present invention or advantage will be set forth in the following description.Further, Partial Feature of the present invention or advantage will be become apparent by specification, or be understood by implementing the present invention.Object of the present invention and certain advantages realize by step specifically noted in specification, claims and accompanying drawing or obtain.
Accompanying drawing explanation
Accompanying drawing is used to provide a further understanding of the present invention, and forms a part for specification, with embodiments of the invention jointly for explaining the present invention, is not construed as limiting the invention.In the accompanying drawings:
Fig. 1 is method flow diagram according to an embodiment of the invention;
Fig. 2, Fig. 3 and Fig. 4 are the sequential chart according to various embodiments of the invention respectively.
Embodiment
Embodiments of the present invention are described in detail below with reference to drawings and Examples, enforcement personnel of the present invention whereby can fully understand how application technology means solve technical problem in the present invention, and reach the implementation procedure of technique effect and specifically implement the present invention according to above-mentioned implementation procedure.It should be noted that, only otherwise form conflict, each embodiment in the present invention and each feature in each embodiment can be combined with each other, and the technical scheme formed is all within protection scope of the present invention.
For the delay problem of machine communication, the present invention proposes the resource regulating method in a kind of machine communication network.Main purpose of the present invention is when ensureing that the communication of communication equipment is carried out smoothly, reduces the time delay of machine communication.Next the concrete implementation of one embodiment of the invention is described in detail based on flow chart.Step shown in the flow chart of accompanying drawing can perform in the computer system comprising such as one group of computer executable instructions.Although show the logical order of each step in flow charts, in some cases, can be different from the step shown or described by order execution herein.
Common machine communication network mainly comprises multiple communication equipment and base station.In the present invention, first the communication equipment in machine communication network with similar traffic feature (transmission data length, data transmitting period) is divided into a machine communication group.Namely first step S100 is performed, structure machine communication group step.Each like this machine communication group comprises one or more communication equipment, and the different communication equipment in uniform machinery communication group has same communication priority.
Then step S101 is performed, segmentation channel resource.Base station in machine communication network is split channel resource for different machine communication groups.Different machine communication groups obtains channel resource in the mode fought for.Concrete, be the priority considering machine communication group communication demand, the priority access channel resource that priority is high.
Following execution step S110, send scheduling authorization, send corresponding scheduling authorization to machine communication group thus be machine communication group allocation channel resource.Machine communication group performs step S111 after receiving scheduling authorization, and process scheduling authorization, machine communication group processes the scheduling authorization that receives thus obtains corresponding channel resource.Then, communication equipment in machine communication group performs step S120, initiating communication request, machine communication group performs step S125 after receiving communication request, access channel resource, the corresponding communication equipment in machine communication group is accessed channel resource according to ad hoc rules by machine communication group successively.Like this, the communication equipment of access channel resource just can perform step S131, sends data to base station.Finally, base station performs step S132, accepts and deal with data.
Compared with prior art, the signaling consumption of communication equipment access channel resource can be simplified according to method of the present invention.For the simplest situation, suppose that machine communication group only comprises a communication equipment.As shown in Figure 2, on initial timing node 201, base station 213 performs step S220, sends scheduling authorization to machine communication group.Through specific duration, have received scheduling authorization in timing node 202 machine communication group 212.
Then machine communication group 212 starts to perform step S230 at timing node 202, process scheduling authorization.To be disposed acquisition channel resource at timing node 203 after consuming specific duration.Next, in the communication equipment initiating communication request of timing node 203 machine communication group 212; Communication equipment is accessed channel resource after receiving communication request by machine communication group 212; Communication equipment performs step S240, sends data to base station.Through specific duration, have received data in timing node 204 base station 213.Finally, base station starts to perform step S250 at timing node 204, accepts and deal with data being disposed at timing node 205.
In a practical situation, machine communication group often comprises a more than communication equipment, and after machine communication group obtains channel resource, the multiple communication equipments that there will be in machine communication group send the situation of communication request simultaneously.Due to the same time, can only there be a communication equipment access channel resource in a machine communication group, therefore according to ad hoc rules, the corresponding communication equipment in machine communication group must be accessed channel resource successively.In the present embodiment, accessed successively in the process of channel resource by the corresponding communication equipment in machine communication group, communication equipment accesses channel resource in the mode of competition.Concrete, be the priority considering communication apparatus communication demand, the priority access channel resource that priority is high.Because resource is that the mode of competing is assigned with, relative to traditional source scheduling mode, signaling is simplified.
But there is similar traffic feature (transmission data length, data transmitting period) due to the communication equipment in machine communication group.This just causes multiple communication equipment to have identical priority, and at this moment the communication request of multiple communication equipment will collide.In the present embodiment, the communication equipment in machine communication group accesses in the process of channel resource in the mode of competition the communication request collision problem adopting avoidance mechanism to solve different communication equipments.
Concrete, in an embodiment of the present invention, at cellular network (LongTermEvolution, LTE) in the wireless resource scheduling process of machine communication, in conjunction with Carrier Sense Multiple Access/collision detection (CarrierSenseMultipleAccesswithCollisionAvoidance, CSMA/CA) avoidance mechanism in, determines the priority in request moment, thus forms the data transfer sequence of communication equipment in machine communication group with the size of keeping out of the way window.
As shown in Figure 1, after step S120, machine communication group performs step S121, judges whether communication request collision occurs.If there is not communication request collision (such as only having a communication equipment to initiate communication request), then perform step S125.
If there is communication request collision, the communication request of namely different communication equipments collides, then perform step S122, distributes and keeps out of the way window.What each communication equipment collided for communication request distributed corresponding specific duration keeps out of the way window.Then each communication equipment that communication request collides performs step S123 respectively, keeps out of the way, and is assigned with the described communication equipment keeping out of the way window and keeps out of the way corresponding duration.
That in step S122, distributes different duration to different communication equipments keeps out of the way window (concrete, in the present embodiment, to adopt random mode to generate the duration keeping out of the way window, thus ensure different to keep out of the way duration corresponding to window).Communication equipments different like this to keep out of the way duration just different, its time point terminating to keep out of the way is also just different.The communication equipment terminating to keep out of the way performs step S120, initiating communication request again again.The time point terminating to keep out of the way due to communication equipment is different, its again initiating communication request time would not produce communication request collision, now machine communication group performs step S125, by the communication equipment of initiating communication request access channel resource, thus solves initial collision problem.
It is noted herein that, when experience the communication equipment kept out of the way again initiating communication request time, although what start to keep out of the way with it can not collide again with it simultaneously, now may occur that not experiencing the new communication equipment kept out of the way creates communication requirement thus have issued communication request (first time communication request).Now communication request (first time communication request) and the communication request after keeping out of the way just there occurs collision.The mode of solving collision can be continue to adopt the mode of distributing and keeping out of the way window and carrying out keeping out of the way, but this also result in continuous print simultaneously and keeps out of the way thus create the unnecessary useless stand-by period.Also same communication equipment can be caused in addition to carry out many wheels continuously and to keep out of the way the situation that always can not access channel resource.In order to avoid the generation of above-mentioned situation, in the present embodiment, if multiple communication equipments that communication request collision occurs only comprise one and have experienced the communication equipment keeping out of the way window, for experience the communication equipment keeping out of the way window distribute duration be zero keep out of the way window.
Analyze theoretically, suppose that now there is N number of communication equipment contention access specific channel resource simultaneously in machine communication group.In order to ensure the transfer of data of this MTC group, each user keeps out of the way with a random length of window.Then, the precedence transmitted is determined according to the front and back of request time.The propagation delay time of equipment i after kth time is kept out of the way be defined as:
D k i = t k i + T 0 - - - ( 1 ) ,
Wherein it is the request moment of machinery equipment i after kth time is kept out of the way.Whole MTC group time delay is defined as D n.The length L keeping out of the way window is assumed to be obedience and is uniformly distributed l ~ U (0, W).According to the resource regulating method in a kind of machine communication network, equipment may before Successful transmissions data keeping out of the way through several times.For each equipment i, it keep out of the way window be independently, obey same equally distributed.The condition that machinery equipment i can transmit data after keeping out of the way k time is: remaining machinery equipment request time be all longer than equipment i. be defined as:
Ω K C = { x | x ∈ Ω , x ∉ Ω K } - - - ( 2 ) ,
Wherein Ω is whole equipment cluster set, and Ω kwhat represent is the cluster tool passed when keeping out of the way for the K time.Can successfully at the probability of K Successful transmissions for a typical equipment i be calculated as follows:
In formula 3, obedience is uniformly distributed, and is defined as: (1) formula obeys independent backoff procedure for different equipment, and (3) formula is obeyed independence, and different equipment i is obeyed same evenly with distribution.Consider the consistency of all devices, each machinery equipment any once keep out of the way time there is the probability of identical Successful transmissions data.So for etc. the equipment of data to be transmitted, always keep out of the way the expectation BT of number of times totalbe:
BT t o t a l = Σ k = 1 N kδ k i = Σ k = 1 N k ( 1 2 ) N + 1 - K - - - ( 4 )
So the mean transit delay D for whole MTC device group the chances are:
D = BT t o t a l E [ l ] + T 0 = M 2 W + T 0 - - - ( 5 )
For a simple application example, suppose that machine communication group comprises communication equipment A and B.As shown in Figure 3, on initial timing node 301, base station 313 performs step S320, sends scheduling authorization to machine communication group 312.Through specific duration, have received scheduling authorization in timing node 302 machine communication group 312.Then machine communication group 312 starts to perform step S321 at timing node 302, process scheduling authorization.To be disposed acquisition channel resource at timing node 314 after consuming specific duration.
Next, in communication equipment A and the request of B initiating communication of timing node 314 machine communication group 312.The communication request of device A and equipment B collides, and distributes different keep out of the way window after machine communication group 312 receives communication request respectively to device A and equipment B.Device A keep out of the way window be timing node 314 to timing node 303 (keeping out of the way step S322), the window of keeping out of the way of equipment B is that timing node 314 is to timing node 306 (keeping out of the way step S332).
Device A performs step S322 and terminates keep out of the way and initiate new communication request at timing node 303, and device A is accessed channel resource after receiving communication request by machine communication group 312.Device A performs step S323, sends data, sends data to base station 313.Through specific duration, have received data in timing node 304 base station 313.Finally, base station 313 starts to perform step S324 at timing node 304, accepts and deal with data being disposed at timing node 305.
Equipment B performs step S332 and terminates keep out of the way and initiate new communication request at timing node 306, and equipment B is accessed channel resource after receiving communication request by machine communication group 312.Equipment B performs step S333, sends data, sends data to base station 313.Through specific duration, have received data in timing node 307 base station 313.Finally, base station 313 starts to perform step S324 at timing node 307, accepts and deal with data being disposed at timing node 308.
Further, for the communication equipment occurred in multiple communication equipments of communication request collision distribute duration be zero keep out of the way window.So just can reduce time delay further.Such as in the embodiment shown in fig. 3, for device A distribute duration be zero keep out of the way window, be just equivalent to timing node 314 to overlap with timing node 303, device A does not experience to keep out of the way and directly accesses channel resource.It is noted herein that, during the collision of multiple communication equipment generation communication request can only to one of them communication equipment distribute duration be zero keep out of the way window.
When communication equipment is accessed channel resource, also need to consider a kind of situation, that exactly when the request of communication equipment initiating communication corresponding channel resource be in down state (such as base station just cannot receive new data in deal with data, channel resource is occupied, and the transfer of data of a upper equipment does not also complete or channel resource has been assigned to other machine communication group etc. temporarily) and cause accessing.Such as in the process of keeping out of the way, likely there will be machinery equipment and kept out of the way in the occupied time slot of channel.Therefore, even if the request moment of this equipment comes before queue, this channel can not be assigned to it.Such as device A asks the moment to be dropped in channel occupancy time slot when (k-1) secondary random back.As a result, when ensuing kth time is transmitted, the chance of channel access is handed to equipment B by device A.
For above-mentioned situation, add the step whether authenticated channel resource can use (whether occupied) in the present embodiment.Considering the fairness between MTC device group, supposing that each equipment is likely kept out of the way in channel occupancy time slot when keeping out of the way.In order to address this problem, invention introduces and heavily keep out of the way.If channel resource is in down state when the request of communication equipment initiating communication, then for communication equipment distribute corresponding specific duration keep out of the way window; Be assigned with the communication equipment keeping out of the way window and keep out of the way initiating communication request again after corresponding duration; If channel resource is in upstate by the communication equipment of initiating communication request access channel resource when the request of communication equipment initiating communication.
Be assigned with if certain the communication equipment keeping out of the way window keep out of the way corresponding duration after again initiating communication request time channel resource be still in down state, so continue as communication equipment again sub-distribution new keep out of the way window (heavily keeping out of the way).
In the present embodiment, communication request hit-treatment and unavailable process of channel resource are just combined as shown in Figure 1, when judging there is not communication request collision in step S121, perform step S124, channel can with judging.Judge whether channel resource can be used.If channel resource is unavailable, perform step S122, for communication equipment again sub-distribution new keep out of the way window (window is kept out of the way in distribution).If there is no channel resource takies, then perform step S125.
It is noted herein that, due to the existence of heavy avoidance mechanism, when experience the communication equipment kept out of the way again initiating communication request time, although what start to keep out of the way with it can not collide again with it simultaneously, now may occur that experiencing the communication equipment heavily kept out of the way have issued communication request at the moment.Now just there occurs collision.The mode of solving collision is continue to adopt the mode of distributing and keeping out of the way window and carrying out keeping out of the way equally.But this also result in continuous print and keeps out of the way thus create the unnecessary useless stand-by period simultaneously.Also same communication equipment can be caused in addition to carry out many wheels continuously and to keep out of the way the situation that always can not access channel resource.In order to avoid the generation of above-mentioned situation, in the present embodiment, if multiple communication equipments that communication request collision occurs only comprise multiplely experienced the communication equipment keeping out of the way window, the communication equipment keeping out of the way window least number of times for experience distribute duration be zero keep out of the way window.
Continue for simple application example, suppose that machine communication group comprises communication equipment A, B and C.As shown in Figure 4, on initial timing node 401, base station 413 performs step S420, sends scheduling authorization to machine communication group 412.Through specific duration, have received scheduling authorization in timing node 402 machine communication group 412.Then machine communication group 412 starts to perform step S421 at timing node 402, process scheduling authorization.To be disposed acquisition channel resource at timing node 414 after consuming specific duration.
Next, in communication equipment A, B and C initiating communication request of timing node 414 machine communication group 412.The communication request of device A, equipment B and equipment C collides, and distributes different keep out of the way window after machine communication group 412 receives communication request respectively to device A, equipment B and equipment C.The window of keeping out of the way of device A is that timing node 414 is to timing node 403 (keeping out of the way step S422), equipment B keep out of the way window be timing node 414 to timing node 415 (keeping out of the way step S442), the window of keeping out of the way of equipment C is that timing node 414 is to timing node 406 (keeping out of the way step S432).
Device A performs step S422 and terminates keep out of the way and initiate new communication request at timing node 403, and device A is accessed channel resource after receiving communication request by machine communication group 412.Device A performs step S423, sends data, sends data to base station 413.Through specific duration, have received data in timing node 404 base station 413.Finally, base station 413 starts to perform step S424 at timing node 404, accepts and deal with data being disposed at timing node 405.
Equipment B performs step S442 and terminates keep out of the way and initiate new communication request at timing node 415, but is also in data sending step (S423) in timing node 415 device A, and that is channel resource is taken by device A.Therefore distribute to equipment B after machine communication group 412 receives the communication request of equipment B and new keep out of the way window, timing node 415 is to timing node 409 (keeping out of the way step S443).
In the process that equipment B is kept out of the way again, equipment C performs step S432 to be terminated keep out of the way and initiate new communication request at timing node 406, and equipment C is accessed channel resource after receiving communication request by machine communication group 412.Equipment C performs step S433, sends data, sends data to base station 413.Through specific duration, have received data in timing node 407 base station 413.Finally, base station 413 starts to perform step S424 at timing node 407, accepts and deal with data being disposed at timing node 408.
Then, equipment B performs step S443 and terminates keep out of the way and initiate new communication request at timing node 409, and equipment B is accessed channel resource after receiving communication request by machine communication group 412.Equipment B performs step S444, sends data, sends data to base station 413.Through specific duration, have received data in timing node 410 base station 413.Finally, base station 413 starts to perform step S424 at timing node 410, accepts and deal with data being disposed at timing node 400.
The performance of scheduling scheme of the present invention is relevant with the length of keeping out of the way window.Correct selection the obedience function keeping out of the way window and the factor communicated will be very large affect time delay.If keeping out of the way window arranges excessive, the machinery equipment extra stand-by period will be caused thus cause the increase of time delay transmitted.When keep out of the way window selection too short will bring heavily keep out of the way and complexity keep out of the way control overhead.Because eNB is the information knowing equipment group in advance, equipment group also can obtain the prior information of the occupied situation of channel.Therefore, eNB can be that equipment reasonably adjusts and keeps out of the way length of window according to channel occupancy slot length.In the present invention, if the window selection kept out of the way is reasonable, so has all equipment of very large probability and all exit the channel occupancy moment, namely can not cause and heavily keep out of the way,
When the number of channel for communicating increases to M, what N number of equipment intercepted arbitrarily channel takies situation.If there are several up channels to be in idle condition, the shortest user of request time is by this channel resource of Stochastic accessing.If do not have channel to be in idle condition, equipment will keep out of the way several times until there is available channel resource.Along with the number of channel for communicating increases, the probability successfully accessing channel will increase and the overall time delay of equipment group will reduce.Suppose the access channel resource of the justice that all users are random, the time delay of so whole equipment group can be reduced to 1/M.
Be the algorithm according to the present invention one embody rule example below
Present hypothesis has a N number of equipment access M channel, in order to distinguish the equipment completing transfer of data and the equipment not completing transfer of data, adopting label, the label of the user of Successful transmissions data is masked as 1.First, the equipment in group is kept out of the way with certain length of window of keeping out of the way.Then, N number of user is sorted according to the request time of oneself.Based on this order, the request moment of each user and the moment of channel occupancy compare.If the request moment of equipment comes the front of queue and asks the moment to meet following condition: RT (i) > CT j,t, this equipment will access channel.After this equipment successfully accesses, the holding time of channel is calculated as: CT j,t← RT (i)+8, formula means that request moment and sole user's busy channel time 8 milliseconds of equipment are depended in current time delay consumption thus.After an equipment i successfully accesses channel j, keep out of the way number of times and add 1, until all users have passed data.
For the generation keeping out of the way window, in an embodiment of the present invention, first base station obtains the prior information of channel resource holding time; Then according to Channel holding time, window average is kept out of the way in adjustment; Then the length of keeping out of the way window is produced at random using this mean value as the average of normal distribution.Wherein backoff window oral from normal distribution L (i) formula as follows.
L ( i ) = 1 2 π σ exp ( - ( i - t ‾ ) 2 2 σ 2 ) - - - ( 6 )
Wherein l is for keeping out of the way length of window, be channel occupancy average time, σ is variance, and reasonably arranging σ can reduce time delay further.To sum up, compared with prior art, the signaling consumption of communication equipment access channel resource can be simplified according to method of the present invention, solve communication request and collide and shorten time delay.
Although execution mode disclosed in this invention is as above, the execution mode that described content just adopts for the ease of understanding the present invention, and be not used to limit the present invention.Method of the present invention also can have other various embodiments.When not deviating from essence of the present invention, those of ordinary skill in the art are when making various corresponding change or distortion according to the present invention, but these change accordingly or are out of shape the protection range that all should belong to claim of the present invention.

Claims (10)

1. the resource regulating method in machine communication network, is characterized in that, said method comprising the steps of:
Machine communication group is constructed in described machine communication network, each described machine communication group comprises the one or more communication equipments in described machine communication network, and the different described communication equipment in same described machine communication group has same communication priority;
Base station in described machine communication network is split channel resource for different described machine communication groups, sends corresponding scheduling authorization to described machine communication group thus for described machine communication group allocation channel resource;
Described machine communication group processes the described scheduling authorization that receives thus obtains corresponding described channel resource;
When described communication equipment initiating communication request, described communication equipment is accessed described channel resource according to ad hoc rules by described machine communication group;
The described communication equipment accessing described channel resource sends data to described base station.
2. method according to claim 1, it is characterized in that, accessing in the process of described channel resource by the described communication equipment in described machine communication group, the different described communication equipment in described machine communication group accesses described channel resource in the mode of competition.
3. method according to claim 2, it is characterized in that, the different described communication equipment in described machine communication group accesses in the process of described channel resource in the mode of competition the communication request collision problem adopting avoidance mechanism to solve different described communication equipments.
4. method according to claim 3, is characterized in that, the process that described communication equipment accesses described channel resource comprises following steps:
What each described communication equipment when the communication request of different described communication equipments collides being that communication request collides distributed corresponding specific duration keeps out of the way window, wherein, distributes described in different duration keep out of the way window to different described communication equipments;
Initiating communication request again after corresponding duration kept out of the way by the described communication equipment keeping out of the way window described in being assigned with;
When the communication request of described communication equipment does not collide, the described communication equipment of initiating described communication request is accessed described channel resource.
5. the method according to claim 3 or 4, is characterized in that, the process that described communication equipment accesses described channel resource comprises following steps:
When described communication equipment initiating communication request, described channel resource is in down state, that distributes corresponding specific duration for described communication equipment keeps out of the way window;
Initiating communication request again after corresponding duration kept out of the way by the described communication equipment keeping out of the way window described in being assigned with;
When described channel resource is in upstate when described communication equipment initiating communication request, the described communication equipment of initiating described communication request is accessed described channel resource.
6. method according to claim 5, is characterized in that, for the described communication equipment occurred in the multiple described communication equipment of described communication request collision distribute duration be zero keep out of the way window.
7. method according to claim 6, it is characterized in that, if the multiple described communication equipment that the collision of described communication request occurs only comprises a described communication equipment having experienced to keep out of the way, for experience the described communication equipment kept out of the way distribute duration be zero keep out of the way window.
8. method according to claim 6, it is characterized in that, if the multiple described communication equipment that the collision of described communication request occurs comprises multiplely experienced the described communication equipment kept out of the way, the described communication equipment keeping out of the way least number of times for experience distribute duration be zero keep out of the way window.
9. method according to claim 4, is characterized in that, keeps out of the way in the process of window and keep out of the way window described in the different duration of stochastic generation described in distribution.
10. the method according to claim 4 or 9, is characterized in that, takies according to described channel resource the duration keeping out of the way window that slot length adjusts described communication equipment.
CN201510524051.9A 2015-08-24 2015-08-24 Method for scheduling resources in machine network Pending CN105163265A (en)

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