CN110213835A - The multi-user's accidental access method and system of unequal error protection priority-based - Google Patents
The multi-user's accidental access method and system of unequal error protection priority-based Download PDFInfo
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- CN110213835A CN110213835A CN201910495733.XA CN201910495733A CN110213835A CN 110213835 A CN110213835 A CN 110213835A CN 201910495733 A CN201910495733 A CN 201910495733A CN 110213835 A CN110213835 A CN 110213835A
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W72/00—Local resource management
- H04W72/04—Wireless resource allocation
- H04W72/044—Wireless resource allocation based on the type of the allocated resource
- H04W72/0446—Resources in time domain, e.g. slots or frames
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W72/00—Local resource management
- H04W72/50—Allocation or scheduling criteria for wireless resources
- H04W72/52—Allocation or scheduling criteria for wireless resources based on load
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W72/00—Local resource management
- H04W72/50—Allocation or scheduling criteria for wireless resources
- H04W72/56—Allocation or scheduling criteria for wireless resources based on priority criteria
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
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- H04W74/08—Non-scheduled access, e.g. ALOHA
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Abstract
The invention discloses the multi-user's accidental access method and system of a kind of unequal error protection priority-based, which includes: the access request for receiving user；Judge current link load situation；If current link load is less than threshold value, then distributing current time slots for the user makes it access power grid, if current link load is greater than threshold value, then the numerical priority value of the user is compared with the numerical priority value of current time slots, if the numerical priority value of the user is greater than the numerical priority value of current time slots, then distributing current time slots for the user makes it access power grid, etc. otherwise after next time slot arrives, continue for the numerical priority value of the user to be compared with the numerical priority value of current time slots, if the numerical priority value of the user is less than the numerical priority value of current time slots, then distributing the current time slots for the user makes it access power grid.Multi-user's accidental access method and system can be improved the utilization rate of channel resource.
Description
Technical field
The present invention relates to smart grid fields of communication technology, do not wait mistake to protect priority-based especially with regard to a kind of
The multi-user's accidental access method and system of shield.
Background technique
As the inevitable development direction of next-generation electric power networks, smart grid be increasingly becoming one it is worldwide important
Research topic.Smart grid introduces the two-way communication framework between user and electrical supplier, may be implemented to power supply and demand both ends
Advanced monitoring and intelligent control.Wireless communication technique installation cost is low, cost of device is small, deployment is quick, access, flexibility extensively
The features such as strong, becomes the communication technology for being more suitable for smart grid application.But relatively harsh environment and difference in smart grid
The promotion of QoS (service quality) performance is made to become existing wireless communications skill the differentiated demand of the communication technology in application scenarios
Art is applied to the bottleneck of smart grid.How to avoid competition when multiple access, rationally resource utilized to become research hotspot.
In the prior art, Most users Admission Control is all based on the optimization problem of energy power consumption minimum, and
In large-scale communication network network, due to the presence of a large amount of base stations, safeguards that energy becomes can not ignore and disregard, therefore gross energy power consumption is not
It obtains and is not taken into account.It is noted that base station activation technology can alleviate equipment in network maintenance, energy is excessively high asks
Topic.Its main thought selects a part of base station and provides service for user to be appropriate, and allows remaining base station to be in non-and swash
State living.The combined optimization scheme of some base station activations and beam-forming method is implemented in maintenance energy power consumption out accordingly
And send and obtain an effective balance between energy power consumption as user access control problem, base station activation problem is almost
All it is considered separately.
In a large amount of burst services, there are some periodic location report informations, does not have high requirements to real-time etc., and some
Business is related to the information such as security threat, it is desirable that rapidly and accurately transmits, thus needs more protections.There is document to propose PR-
Different priorities data have been carried out unequal error protection by ALOHA (r- Aloha is preferential) agreement.In PR-ALOHA agreement, often
Frame is fixed, and there are a part of time slots to be provided only to high-priority users access, reduces high-priority data collision probability, improves
High-priority users throughput.But in PR-ALOHA agreement, the data packet of collision is still dropped, and channel resource does not obtain
Effective use.
The information disclosed in the background technology section is intended only to increase the understanding to general background of the invention, without answering
When being considered as recognizing or imply that the information constitutes the prior art already known to those of ordinary skill in the art in any form.
Summary of the invention
The purpose of the present invention is to provide a kind of multi-user's accidental access methods of unequal error protection priority-based
And system, it can be improved the utilization rate of channel resource.
To achieve the above object, the present invention provides a kind of multi-users of unequal error protection priority-based to connect at random
Entering method, multi-user's accidental access method is used to carry out unequal error protection to different priority datas in power grid,
Multi-user's accidental access method includes: the access request for receiving user；Judge current link load situation；If current
Link load is less than threshold value, then distributing current time slots for the user makes it access power grid, if current link load is greater than described
The numerical priority value of the user is then compared by threshold value with the numerical priority value of current time slots, if the priority number of the user
Value is greater than the numerical priority value of current time slots, then distributing current time slots for the user makes its access power grid, when otherwise etc. next
After gap arrives, continue for the numerical priority value of the user to be compared with the numerical priority value of current time slots, if the user
Numerical priority value is less than the numerical priority value of current time slots, then distributing the current time slots for the user makes it access power grid.Wherein,
The numerical priority value is bigger, then its corresponding priority is smaller.
In a preferred embodiment, multi-user's accidental access method further include: by the user setting in power grid
Different priority and the time slot in power grid is arranged to different priority.
It is described more the present invention also provides a kind of multi-user random access system of unequal error protection priority-based
For user's random access system for carrying out unequal error protection to different priority datas in power grid, the multi-user is random
Access system includes: receiving module, link load judgment module, the first power grid AM access module, priority comparison module, the second electricity
Net AM access module.
Receiving module is used to receive the access request of user.Link load judgment module is coupled with the receiving module,
For judging current link load situation after the access request for receiving the user.First power grid AM access module and the chain
Road load judgment module is coupled, for current link load be less than threshold value in the case where, for the user distribution it is current when
Gap makes it access power grid.Priority comparison module is coupled with the link load judgment module, for negative in current link
It carries in the case where being greater than threshold value, the numerical priority value of the numerical priority value of the user and current time slots is compared, is also used to
When the numerical priority value that comparison result is user is greater than the numerical priority value of current time slots, a time slot is waited, next
Continue for the numerical priority value of the numerical priority value of the user and current time slots to be compared in time slot.Second power grid AM access module
With the priority comparison module, it is less than for the numerical priority value that the comparison result when the priority comparison module is user
When the numerical priority value of current time slots, distributing current time slots for user makes it access power grid.Wherein, the numerical priority value is got over
Greatly, then its corresponding priority is smaller.
In a preferred embodiment, the multi-user random access system further include: User Priority setup module
With slot priorities setup module.User Priority setup module is coupled with the priority comparison module, for being power grid
In the different priority of user setting.Slot priorities setup module is coupled with the priority comparison module, for for
Different priority is arranged in time slot in power grid.
Compared with prior art, the multi-user random access side of unequal error protection priority-based according to the present invention
Method and system, when link load is less than the low link load of threshold value, user can access any time slot, be handled up with reaching
Rate is maximum；And when link load is greater than the high link load of threshold value, certain fixed time slots only allow high-priority users
Access, guarantees effective transmission of high-priority data；Therefore compared with the existing technology, when the present invention can utilize each as far as possible
Gap improves the utilization rate of channel resource.
Detailed description of the invention
Fig. 1 is the multi-user random access side of unequal error protection priority-based according to an embodiment of the present invention
Each step of method；
Fig. 2 is the multi-user random access side of unequal error protection priority-based according to an embodiment of the present invention
The flow chart of method；
Fig. 3 is multi-user's multipriority transmission mode schematic diagram according to an embodiment of the present invention；
Fig. 4 is link load estimated probability distribution map according to an embodiment of the present invention；
Fig. 5 is multi-user's random access system of unequal error protection priority-based according to an embodiment of the present invention
The module composition schematic diagram of system.
Specific embodiment
With reference to the accompanying drawing, specific embodiments of the present invention will be described in detail, it is to be understood that guarantor of the invention
Shield range is not limited by the specific implementation.
Unless otherwise explicitly stated, otherwise in entire disclosure and claims, term " includes " or its change
Changing such as "comprising" or " including " etc. will be understood to comprise stated element or component, and not exclude other members
Part or other component parts.
As depicted in figs. 1 and 2, in one embodiment, the multi-user of the unequal error protection priority-based is random
Cut-in method includes: step S1~step S3.
The access request of user is received in step sl.
Current link load situation is judged in step s 2.
Judge whether to access power grid in step s3.Specifically, if current link load (can basis less than threshold value
Practical application scene self-setting), then distributing current time slots for the user makes it access power grid, if current link load is greater than
The numerical priority value of the user is then compared by the threshold value with the numerical priority value of current time slots, if the user's is preferential
Value of series is greater than the numerical priority value of current time slots, then distributing current time slots for the user makes its access power grid, otherwise etc. next
After a time slot arrives, continue for the numerical priority value of the user to be compared with the numerical priority value of current time slots, if the use
The numerical priority value at family is less than the numerical priority value of current time slots, then distributing the current time slots for the user makes it access power grid,
Wherein, numerical priority value is bigger, then its corresponding priority is smaller.
In one embodiment, multi-user's accidental access method further include: by different preferential of the user setting in power grid
Grade and the time slot in power grid is arranged to different priority.
Fig. 3 is multi-user's multipriority transmission mode schematic diagram of present embodiment, as shown in figure 3, one of micro-capacitance sensor
Data frame is divided into n time slot, shares the m transmission electric energy terminal devices with wireless telecom equipment.Time slot and equipment quilt
It is divided into r different priorities.Priority 1, priority 2 ..., priority r, and priority-level is from high to low.It is negative in low link
In the case of load, all devices can choose in a frame and access power grid in any time slot；In high load situations, each equipment can only
It is linked into the time slot with equal priority or more low priority.Such as the equipment that priority is 2, it can be linked into preferential
Grade is 2,3 ..., in the time slot of r.
Compared with prior art, for this method in low link load, user can access any time slot, be gulped down with reaching
Spit rate maximum；And in high link load, certain fixed time slots only allow high-priority users to access, and guarantee high priority
Effective transmission of data, each time slot are fully utilized, and are integrally improved channel resource utilization rate.
For verification the verifying results, present embodiment has carried out simulation analysis to packet loss and throughput performance.
Network load G is defined first, represents the number of devices accessed in average each time slot, i.e. number of users and number of time slot
Ratio, G=m/n.The probability that each equipment is successfully accessed power grid is 1-q, wherein q is the probability of failed access power grid.
Link load thresholding G*It is defined such that successive interference cancellation process is able to carry out and can recover crash data
Maximum link load value when packet, can be derived fromWherein, λ is the position distribution of equipment, and Λ is
The number-of-packet that average each every frame of user is sent.
Data packet transmits correct probability T, i.e., the number of data packets correctly transmitted and number of time slot in average each time slot
Ratio: T=(1-q) G.
In multi-user's accidental access method according to the present embodiment, high-priority data only allows high-priority users to connect
Enter.Node degree distribution during definition multiple access is as follows: Λ (x) is that each user repeats to send the node degree of data packet
It is distributed Λ (x)=∑lΛlxl, wherein ΛlThe probability of l data packet of transmission is repeated for each user；Ψ (x) is each time slot
The node degree of the number of users received is distributed Ψ (x)=∑lΨlxl, wherein ΨlL number of users is received for each time slot
According to the probability of packet.Λ ' (1)=∑lΛlL is the number-of-packet that average each every frame of user is sent；Ψ ' (1)=∑lΨl·l
The number-of-packet received for averagely each time slot.
User and time slot all have different priorities, then the crash data packet number that different priorities time slot receives is different
's.Assuming that ratio shared by the user that priority is k is Puser (k), the ratio that the time slot that priority is k accounts for total number of timeslots is
Pslot(k).It will be apparent from
User can only transmit packets in the time slot with equal priority or more low priority, so each time slot
In include the data packet with equal priority or higher priority.The mean collisional that time slot with different priorities includes
Number-of-packet can be expressed as follows:
Ψ′1(1)=Puser(1)GΛ′(1)
…
…
When number of users levels off to infinite (m → ∞), bi-distribution is intended to Poisson distribution, and the parameter of Poisson distribution is
Ψ′k(1).Node degree distribution and edge degree during multiple access respectively indicate are as follows:
The node degree distribution of accessing user is set as Λ (x)=0.5x2+0.28x3+0.22x8, link load thresholding at this time
For G*=0.938.Assuming that all data packet length having the same, frame length value is fixed as 2000 (comprising 2000 in i.e. every frame
Time slot), maximum number of iterations is set as 200, and each simulated point result takes the average value of 100 experiments under the same conditions.
When analyzing packet loss and throughput performance, user and time slot, which are divided into high less advanced users proportion Puser, is
(0.5,0.5), different priorities time slot proportion Pslot are respectively set to (0.5,0.5), (0.4,0.6) and (0.6,
0.4).Link load changes by 0.1~2.0, and simulation result and analysis result are compared.
When link load is by 0.1~2.0 variation range, loading the mean value and mean square deviation of estimation, as shown in table 1.Fig. 4 is
Estimated probability distribution map when link load G=0.938, the close node degree distribution of probability can be approximated to be a mean value and mean square deviation
The Gaussian Profile changed with G.
1 link load of table estimates mean value and variance
| Load | Mean value | Mean square deviation |
| 0.2 | 0.200 | 0.007 |
| 0.4 | 0.400 | 0.013 |
| 0.6 | 0.601 | 0.017 |
| 0.8 | 0.799 | 0.025 |
| 1.0 | 1.006 | 0.038 |
| 1.2 | 1.203 | 0.053 |
| 1.4 | 1.408 | 0.080 |
| 1.6 | 1.616 | 0.119 |
| 1.8 | 1.824 | 1.954 |
| 2.0 | 0.140 | 0.165 |
Simulation result shows that the link load of estimation is loaded close to physical link, estimation mean square deviation become larger with load G and
Increase, this method is more accurate to the estimation of link load, therefore multi-user's accidental access method of present embodiment can be more
Add the resource for fully utilizing each time slot, effectively increases handling capacity, improve channel resource utilization rate.
Based on same inventive concept, the present invention also provides a kind of multi-users of unequal error protection priority-based
Random access system, as shown in figure 5, the multi-user random access system includes: receiving module 10, link load judgment module
11, the first power grid AM access module 12, priority comparison module 13, the second power grid AM access module 14.
Receiving module 10 is used to receive the access request of user.Link load judgment module 11 and 10 phase coupling of receiving module
It closes, for judging current link load situation after the access request for receiving user.
First power grid AM access module 12 is coupled with link load judgment module 11, for being less than in current link load
In the case where threshold value, distributing current time slots for the user makes it access power grid.
Priority comparison module 13 is coupled with link load judgment module 11, for being greater than threshold in current link load
In the case where value, the numerical priority value of the numerical priority value of the user and current time slots is compared, is also used to work as and compares knot
When fruit is that the numerical priority value of user is greater than the numerical priority value of current time slots, a time slot is waited, is relayed in next time slot
It is continuous to be compared the numerical priority value of the user and the numerical priority value of current time slots.Wherein, the bigger expression of numerical priority value
Priority is lower.
Second power grid AM access module 14 and priority comparison module 13, for working as the comparison result of priority comparison module 13
When being that the numerical priority value of user is less than the numerical priority value of current time slots, distributing current time slots for user makes it access power grid.
In one embodiment, multi-user random access system further include: User Priority setup module 15 and time slot
Priority setup module 16.User Priority setup module 15 is coupled with priority comparison module 13, for in power grid
The different priority of user setting.Slot priorities setup module 16 is coupled with priority comparison module 13, for being power grid
In time slot different priority is set.
In conclusion multi-user's accidental access method of the unequal error protection priority-based of present embodiment and being
System, in low link load, user can access any time slot, to reach throughput maximum；And in high link load feelings
Under condition, certain fixed time slots only allow high-priority users to access, and guarantee effective transmission of high-priority data, each time slot quilt
It makes full use of, is integrally improved channel resource utilization rate.
It should be understood by those skilled in the art that, embodiments herein can provide as method, system or computer program
Product.Therefore, complete hardware embodiment, complete software embodiment or reality combining software and hardware aspects can be used in the application
Apply the form of example.Moreover, it wherein includes the computer of computer usable program code that the application, which can be used in one or more,
The computer program implemented in usable storage medium (including but not limited to magnetic disk storage, CD-ROM, optical memory etc.) produces
The form of product.
The application is referring to method, the process of equipment (system) and computer program product according to the embodiment of the present application
Figure and/or block diagram describe.It should be understood that every one stream in flowchart and/or the block diagram can be realized by computer program instructions
The combination of process and/or box in journey and/or box and flowchart and/or the block diagram.It can provide these computer programs
Instruct the processor of general purpose computer, special purpose computer, Embedded Processor or other programmable data processing devices to produce
A raw machine, so that being generated by the instruction that computer or the processor of other programmable data processing devices execute for real
The device for the function of being specified in present one or more flows of the flowchart and/or one or more blocks of the block diagram.
These computer program instructions, which may also be stored in, is able to guide computer or other programmable data processing devices with spy
Determine in the computer-readable memory that mode works, so that it includes referring to that instruction stored in the computer readable memory, which generates,
Enable the manufacture of device, the command device realize in one box of one or more flows of the flowchart and/or block diagram or
The function of being specified in multiple boxes.
These computer program instructions also can be loaded onto a computer or other programmable data processing device, so that counting
Series of operation steps are executed on calculation machine or other programmable devices to generate computer implemented processing, thus in computer or
The instruction executed on other programmable devices is provided for realizing in one or more flows of the flowchart and/or block diagram one
The step of function of being specified in a box or multiple boxes.
The aforementioned description to specific exemplary embodiment of the invention is in order to illustrate and illustration purpose.These descriptions
It is not wishing to limit the invention to disclosed precise forms, and it will be apparent that according to the above instruction, can much be changed
And variation.The purpose of selecting and describing the exemplary embodiment is that explaining specific principle of the invention and its actually answering
With so that those skilled in the art can be realized and utilize a variety of different exemplary implementation schemes of the invention and
Various chooses and changes.The scope of the present invention is intended to be limited by claims and its equivalents.
Claims (4)
1. a kind of multi-user's accidental access method of unequal error protection priority-based, multi-user's accidental access method
For carrying out unequal error protection to different priority datas in power grid, which is characterized in that multi-user's random access
Method includes:
Receive the access request of user；
Judge current link load situation；And
If current link load is less than threshold value, distributing current time slots for the user makes it access power grid, if current link
Load is greater than the threshold value, then is compared the numerical priority value of the user with the numerical priority value of current time slots, if the use
The numerical priority value at family is greater than the numerical priority value of current time slots, then distributing current time slots for the user makes it access power grid, no
After then etc. next time slot arrives, continue to compare the numerical priority value of the numerical priority value of the user and current time slots
Compared with if the numerical priority value of the user is less than the numerical priority value of current time slots, distributing the current time slots for the user makes it
Power grid is accessed,
Wherein, the numerical priority value is bigger, then its corresponding priority is smaller.
2. multi-user's accidental access method of unequal error protection, feature exist priority-based as described in claim 1
In multi-user's accidental access method further include:
By the different priority of the user setting in power grid；And
Time slot in power grid is arranged to different priority.
3. a kind of multi-user random access system of unequal error protection priority-based, the multi-user random access system
For carrying out unequal error protection to different priority datas in power grid, which is characterized in that multi-user's random access
System includes:
Receiving module, for receiving the access request of user；
Link load judgment module is coupled with the receiving module, for judging after the access request for receiving the user
Current link load situation；
First power grid AM access module is coupled with the link load judgment module, for being less than threshold in current link load
In the case where value, distributing current time slots for the user makes it access power grid；
Priority comparison module is coupled with the link load judgment module, for being greater than threshold value in current link load
In the case where, the numerical priority value of the numerical priority value of the user and current time slots is compared, is also used to work as comparison result
When being that the numerical priority value of user is greater than the numerical priority value of current time slots, a time slot is waited, is continued in next time slot
The numerical priority value of the numerical priority value of the user and current time slots is compared；And
Second power grid AM access module, and the priority comparison module, for working as the comparison result of the priority comparison module
When being that the numerical priority value of user is less than the numerical priority value of current time slots, distributing current time slots for user makes it access power grid,
Wherein, the numerical priority value is bigger, then its corresponding priority is smaller.
4. the multi-user random access system of unequal error protection, feature exist priority-based as claimed in claim 3
In the multi-user random access system further include:
User Priority setup module is coupled with the priority comparison module, for for the user setting in power grid it is different
Priority；And
Slot priorities setup module is coupled with the priority comparison module, different for being arranged for the time slot in power grid
Priority.
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