CN107086900A - Tackle the M2M communication Access Control optimization method of LTE network emergency - Google Patents
Tackle the M2M communication Access Control optimization method of LTE network emergency Download PDFInfo
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- CN107086900A CN107086900A CN201710315145.4A CN201710315145A CN107086900A CN 107086900 A CN107086900 A CN 107086900A CN 201710315145 A CN201710315145 A CN 201710315145A CN 107086900 A CN107086900 A CN 107086900A
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- 238000000034 method Methods 0.000 title claims abstract description 24
- 238000004891 communication Methods 0.000 title claims abstract description 21
- 238000005457 optimization Methods 0.000 title claims abstract description 16
- 230000003044 adaptive effect Effects 0.000 claims abstract description 9
- 230000005540 biological transmission Effects 0.000 claims description 6
- 238000001514 detection method Methods 0.000 claims description 2
- 238000012067 mathematical method Methods 0.000 claims description 2
- 238000013178 mathematical model Methods 0.000 claims description 2
- 238000012545 processing Methods 0.000 claims description 2
- 238000004364 calculation method Methods 0.000 description 2
- 230000001413 cellular effect Effects 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 238000012544 monitoring process Methods 0.000 description 1
- 238000011160 research Methods 0.000 description 1
Classifications
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W48/00—Access restriction; Network selection; Access point selection
- H04W48/02—Access restriction performed under specific conditions
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L5/00—Arrangements affording multiple use of the transmission path
- H04L5/003—Arrangements for allocating sub-channels of the transmission path
- H04L5/0048—Allocation of pilot signals, i.e. of signals known to the receiver
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W4/00—Services specially adapted for wireless communication networks; Facilities therefor
- H04W4/70—Services for machine-to-machine communication [M2M] or machine type communication [MTC]
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W48/00—Access restriction; Network selection; Access point selection
- H04W48/16—Discovering, processing access restriction or access information
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W74/00—Wireless channel access
- H04W74/08—Non-scheduled access, e.g. ALOHA
- H04W74/0833—Random access procedures, e.g. with 4-step access
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W74/00—Wireless channel access
- H04W74/08—Non-scheduled access, e.g. ALOHA
- H04W74/0866—Non-scheduled access, e.g. ALOHA using a dedicated channel for access
- H04W74/0875—Non-scheduled access, e.g. ALOHA using a dedicated channel for access with assigned priorities based access
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- Engineering & Computer Science (AREA)
- Signal Processing (AREA)
- Computer Networks & Wireless Communication (AREA)
- Computer Security & Cryptography (AREA)
- Mobile Radio Communication Systems (AREA)
Abstract
The present invention discloses a kind of M2M communication Access Control optimization method for tackling LTE network emergency, comprises the following steps：(10) reporting emergency event occurs：Machine node sends specific preamble to base station；(20) general service is prevented to access：According to specific preamble, emergency is placed in limit priority；(30) urgent number of nodes is estimated：The nodes of base station estimation request access；(40) adaptive adjustment access slot length：Base station is according to nodes, the length of adaptive adjustment access slot；(50) judge that event handling is finished：There is no node to transmit lead code, then judge that emergency is disposed；(60) base station time slot returns to normal configuration：Normal configuration will be returned to normal value, and by access slot length to the access barred Parameter reconstruction of common machines node.The Access Control optimization method of the present invention, accesses unobstructed, reliability height.
Description
Technical field
The invention belongs to machine communication technical field, particularly a kind of access is unobstructed, and the high reply LTE network of reliability is tight
The M2M communication Access Control optimization method of urgent thing part.
Background technology
M2M (Machine-to-Machine) communications are the communication closely related with IoT (Internet of Things)
Technology, refer to equipment by wired or wireless mode can transmit information in the case of without human intervention.Currently, due to
The huge commercial value of M2M business and wide application prospect, such as intelligent transportation, intelligent grid, seismic monitoring, consumption are set
Standby, smart home, public safety and intelligent medical etc., M2M communication are just attracting increasing notice.
In existing cellular network such as LTE, there are many researchs on M2M communication.Existing cellular network master
It is designed for person to person (H2H) communication, because M2M communication has many differences, existing honeycomb compared with H2H communications
Network can not well adapt to the communication requirement of M2M communication.The main flow feature of M2M communication is that great deal of nodes transmits low number
According to the message of rate.In order to transmit data, each node needs to initiate a random access procedure with the foundation connection of same base station.
In certain some urgent scenes, such as disaster and power failure, machine node is needed to M2M server reporting emergency alarms, bag
Include the type of disaster and the place of disaster.When many related machine nodes, which attempt Stochastic accessing, carrys out reporting emergency alarm,
It is likely to result in Physical Random Access Channel (PRACH) congestion.In this case, machine type node can hardly
The access network under delay requirement as defined in alarm.
In a word, the problem of prior art is present be：When LTE network emergency occurs, M2M communication access it is obstructed,
It is unreliable.
The content of the invention
It is an object of the invention to provide a kind of M2M communication Access Control optimization method for tackling LTE network emergency,
Access is unobstructed, and reliability is high.
The technical solution for realizing the object of the invention is：
A kind of M2M communication Access Control optimization method for tackling LTE network emergency, comprises the following steps：
(10) reporting emergency event occurs：Machine node sends specific preamble to base station, and the specific preamble is served as reasons
Reserved, be only capable of by the transmission of machine node, the generation for reporting emergency event by emergency in base station；
(20) general service is prevented to access：After base station learns that emergency occurs according to specific preamble, by emergency
Limit priority is placed in, the access of general service is prevented；
(30) urgent number of nodes is estimated：Next time slot after event occurs for base station is set to estimate time slot, and estimation please
Seek the nodes of access；
(40) adaptive adjustment access slot length：The nodes that base station is obtained according to estimation, during adaptive adjustment access
The length of gap, to meet defined time delay；
(50) judge that event handling is finished：Base station detects no node transmission lead code in some time slot, by retracting
Time, lead code still is transmitted without equipment, then judge that emergency is disposed；
(60) base station time slot returns to normal configuration：Base station by the access barred Parameter reconstruction of common machines node to just
Constant value, and access slot length is returned into normal configuration.
Compared with prior art, its remarkable advantage is the present invention：
1st, access unobstructed：Common connection control method is usually dynamic adjustment ACB parameters, is mainly used in alleviating lead code
Conflict, the average delay improvement to equipment is not obvious.The present invention by general service set access prevent, save with
The resource block of machine access procedure, delay performance is effectively improved so as to the method for the quantity by increasing random access time slot,
Access is unobstructed；
2nd, reliability is high：Common cut-in method is due to the common presence of urgent node and ordinary node, it is difficult to accurate estimation
The quantity of urgent node.The present invention sets ACB (access barred) parameter to be 0 to general service, is specifically connect by setting one
Input time slot, can accurately estimate the quantity of urgent node, reduce calculation error.
The present invention is described in further detail with reference to the accompanying drawings and detailed description.
Brief description of the drawings
Fig. 1 tackles the main flow chart of the M2M communication Access Control optimization method of LTE network emergency for the present invention.
Fig. 2 is the flow chart of reporting emergency event generation step in Fig. 1.
Fig. 3 is to estimate the flow chart of urgent number of nodes step in Fig. 1.
Fig. 4 is the flow chart of adaptive adjustment access slot length step in Fig. 1.
Fig. 5 finishes the flow chart of step for judgement event handling in Fig. 1.
Fig. 6 returns to the flow chart of normal configuration step for base station time slot in Fig. 1.
Fig. 7 is estimation number of nodes and the slot model figure of adjustment slot length.
In figure, 1 base, 2 panels, 11 top panels, 12 lower panels, 111 through holes.
Embodiment
As shown in figure 1, the M2M communication Access Control optimization method of present invention reply LTE network emergency, including it is as follows
Step：
(10) reporting emergency event occurs：Machine node sends specific preamble to base station, and the specific preamble is served as reasons
Reserved, be only capable of by the transmission of machine node, the generation for reporting emergency event by emergency in base station；
As shown in Fig. 2 (10) the reporting emergency event generation step includes：
(11) urgent lead code is transmitted：After emergency generation, urgent node transmits special urgent leading to base station
Code, the urgent lead code is reserved by base station exclusively for urgent node；
(12) emergency is judged：Base station judges emergency after urgent lead code is received, and prepares to make
Go out corresponding adjustment.
(20) general service is prevented to access：After base station learns that emergency occurs according to specific preamble, by emergency
Limit priority is placed in, the access of general service is prevented；
Described (20) prevent general service from accessing step：
Base station utilizes access barred mechanism, and the access barred parameter to general service is set to 0, with treated in emergency
The access of general service is prevented in journey, the access barred parameter is a base station broadcast access probability p in the lte networks,
The node of each request access selects the random number between one 0 to 1, if the number of selection is less than p, then the node can be transmitted
Lead code, otherwise the node can be prohibited access.
(30) urgent number of nodes is estimated：Next time slot after event occurs for base station is set to estimate time slot, and estimation please
Seek the nodes of access；
As shown in figure 3, described (30) estimate that urgent number of nodes step includes：
(31) setting estimation time slot：Base station is after judging that emergency occurs, by first access slot of urgent node
It is set to estimate time slot, slot length is 1ms；
(32) maximal possibility estimation obtains estimate：Base station sets different be chosen to the different lead codes in access slot
Probability is selected, according to the probability distribution that different lead codes are idle, successful and conflict, with reference to the shape of the actually detected each lead code arrived
State, the nodes of access are asked with the mathematical method estimation of maximal possibility estimation.
(40) adaptive adjustment access slot length：The nodes that base station is obtained according to estimation, during adaptive adjustment access
The length of gap, to meet defined time delay；
Include as shown in figure 4, (40) adaptively adjust access slot length step：
(41) average delay is calculated：With Markov chain founding mathematical models, obtain average delay and number of nodes and connect
The relation of input time slot length；
(42) slot length is adjusted：Average delay is calculated according to the number of nodes that estimation is obtained, finds and meets delay requirement
Random access slot length maximum.
(50) judge that event handling is finished：Base station detects no node transmission lead code in some time slot, by retracting
Time, lead code still is transmitted without equipment, then judge that emergency is disposed；
As shown in figure 5, described (50) judge that event handling finishes step and included：
(51) time slot state is detected：Whether base station detection has equipment to transmit lead code in random access time slot；
(52) timing judges：If transmitting lead code without equipment, base station is counted since random access backoff window start
When, if until timing to random access backoff window terminates, lead code is transmitted still without equipment, base station judges emergency processing
Finish, otherwise return to step (51).
(60) base station time slot returns to normal configuration：Base station by the access barred Parameter reconstruction of common machines node to just
Constant value, and access slot length is returned into normal configuration.
As shown in fig. 6, (60) base station time slot returns to normal configuration step and included：
(61) access barred parameter is adjusted：Base station is by for the access barred Parameter reconstruction of general service to normal value；
(62) slot length is adjusted：Random access slot length is returned to normal configuration by base station.
Fig. 7 show the slot model figure of estimation number of nodes and adjustment slot length.
In sometime point t1, emergency generation.Related urgent node sends an advance reservation to base station first
Lead code, to notify the generation of base station emergency.After base station learns that emergency occurs, time slot 1 is set, the time slot is main
Urgent nodes for estimating request access.Estimation is obtained after urgent nodes, and base station adaptively adjusts random access time slot
Length, to increase available random access resource quantity.In time slot n, base station detects emergency access request and handled
Finish.Base station and time point t2The configuration of channel is returned into normal value.
The present invention continues to use existing LTE RACHs framework, firmly fits actual, use value is high.The present invention is right
General service sets ACB parameters to be 0, by setting a specific access slot, can accurately estimate the quantity of urgent node,
Reduce calculation error.The present invention saves the resource block of random access procedure by setting access to prevent general service, so that
Delay performance can be effectively improved by the method for the quantity for increasing random access time slot.
Claims (7)
1. a kind of M2M communication Access Control optimization method for tackling LTE network emergency, it is characterised in that including following step
Suddenly：
(10) reporting emergency event occurs：Machine node sends specific preamble to base station, and the specific preamble is by base station
Reserved, be only capable of by the transmission of machine node, the generation for reporting emergency event by emergency；
(20) general service is prevented to access：After base station learns that emergency occurs according to specific preamble, emergency is placed in
Limit priority, prevents the access of general service；
(30) urgent number of nodes is estimated：Next time slot after event occurs for base station is set to estimate time slot, and estimation request connects
The nodes entered；
(40) adaptive adjustment access slot length：The nodes that base station is obtained according to estimation, adaptive adjustment access slot
Length, to meet defined time delay；
(50) judge that event handling is finished：Base station detects no node transmission lead code in some time slot, by Backoff time,
Lead code still is transmitted without equipment, then judges that emergency is disposed；
(60) base station time slot returns to normal configuration：Base station by the access barred Parameter reconstruction of common machines node to normal
Value, and access slot length is returned into normal configuration.
2. Access Control optimization method according to claim 1, it is characterised in that (10) the reporting emergency event occurs
Step includes：
(11) urgent lead code is transmitted：After emergency generation, urgent node transmits special urgent lead code to base station, should
Urgent lead code is reserved by base station exclusively for urgent node；
(12) emergency is judged：Base station judges emergency after urgent lead code is received, and phase is made in preparation
It should adjust.
3. Access Control optimization method according to claim 1, it is characterised in that described (20) prevent general service from accessing
Step is specially：
Base station utilizes access barred mechanism, and the access barred parameter to general service is set to 0, with emergency processing procedure
The access of general service is prevented, the access barred parameter is a base station broadcast access probability p in the lte networks, each
The node of request access selects the random number between one 0 to 1, if the number of selection is less than p, then the node can transmit leading
Yard, otherwise the node can be prohibited access.
4. Access Control optimization method according to claim 1, it is characterised in that described (30) estimate urgent number of nodes
Step includes：
(31) setting estimation time slot：First access slot of urgent node is set to by base station after judging that emergency occurs
Estimate time slot, slot length is 1ms；
(32) maximal possibility estimation obtains estimate：Base station sets different selected general to the different lead codes in access slot
Rate, according to the probability distribution that different lead codes are idle, successful and conflict, with reference to the state of the actually detected each lead code arrived,
With the nodes of the mathematical method estimation request access of maximal possibility estimation.
5. Access Control optimization method according to claim 1, it is characterised in that when (40) adaptively adjust access
Gap length step includes：
(41) average delay is calculated：With Markov chain founding mathematical models, when obtaining average delay with number of nodes and access
The relation of gap length；
(42) slot length is adjusted：Average delay is calculated according to the obtained number of nodes of estimation, find meet delay requirement with
The maximum of machine access slot length.
6. Access Control optimization method according to claim 1, it is characterised in that described (50) judge that event handling is finished
Step includes：
(51) time slot state is detected：Whether base station detection has equipment to transmit lead code in random access time slot；
(52) timing judges：If without equipment transmit lead code, base station countdown since random access backoff window start, if
Until timing to random access backoff window terminates, lead code is transmitted still without equipment, base station judges that emergency is disposed,
Otherwise step (51) is returned to.
7. Access Control optimization method according to claim 1, it is characterised in that (60) base station time slot is returned to just
Normal configuration step includes：
(61) access barred parameter is adjusted：Base station is by for the access barred Parameter reconstruction of general service to normal value；
(62) slot length is adjusted：Random access slot length is returned to normal configuration by base station.
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| CN107086900B (en) | 2020-04-10 |
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