CN107105474A - A kind of accidental access method limited in arrowband Internet of Things based on dynamic access - Google Patents
A kind of accidental access method limited in arrowband Internet of Things based on dynamic access Download PDFInfo
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- CN107105474A CN107105474A CN201710168122.5A CN201710168122A CN107105474A CN 107105474 A CN107105474 A CN 107105474A CN 201710168122 A CN201710168122 A CN 201710168122A CN 107105474 A CN107105474 A CN 107105474A
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- 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
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- 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
- H04W48/06—Access restriction performed under specific conditions based on traffic conditions
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W74/00—Wireless channel access
- H04W74/08—Non-scheduled access, e.g. ALOHA
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- 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
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Abstract
The invention discloses the accidental access method limited in a kind of arrowband Internet of Things based on dynamic access, including：(1), the difference of time delay is required according to arrowband internet-of-things terminal, terminal is divided into the first kind, Equations of The Second Kind；(2), the different access parameter generating mode of the first Terminal Type, the second Terminal Type is set, and the access parameter perseverance of the first Terminal Type is zero, the access parameter of the second Terminal Type is the random number in (0,1)；(3), base station is according to current request access terminal number, one access probability factor of dynamic broadcast, it is allowed to which the terminal that access parameter is less than access probability factor is accessed；(4) terminal of access, is allowed to randomly choose and send leading to base station, if certain leading is selected by multiple terminals, it is believed that select the leading terminal access failure, it is allowed to which it resends access request in next time slot；If leading selected by single terminal, then it is assumed that the terminal is successfully accessed.Using the cut-in method of the present invention, can effectively improve the first Terminal Type is successfully accessed rate first, greatly reduces maximum access delay.
Description
Technical field
The invention belongs to the arrowband technology of Internet of things based on cellular network, and in particular to a kind of access side of arrowband Internet of Things
Method.
Background technology
Arrowband Internet of Things (Narrow band Internet of Things, NB-IoT), is towards low work(as one kind
The honeycomb technology of Internet of things that the internet of things service of rate wide area covering is produced.Its up-downgoing only takes up 180KHZ bandwidth of operation, portion
Management side formula is extremely flexible, can independently dispose, protection band is disposed and with interior deployment.Arrowband Internet of Things can be deployed in existing LTE and
In LTE-A network, software and hardware upgrading is carried out based on existing network facility.
The Internet of Things communication technology has many kinds, is distinguished from transmission range, can be divided into short-range communication technology and wide-area communication
Technology.Short-range communication technology such as Zigbee, Wi-Fi, bluetooth etc., communication distance are only several meters, typical application scenarios such as intelligence
Household etc.；Wide-area communication include cable technology and wireless technology, cable technology such as fiber optic communication, wireless communication technology is such as
2G/3G/4G etc., can provide support for cargo tracking, smart city etc..Short-range communication technical communication distance is shorter, can be in
Long haul communication is realized after mode, has the disadvantage poor reliability；Wide-area communication reliability is high, safe, has the disadvantage cost
It is high；Wide-area communication is directed to the larger business of communication for service flow, and internet of things service packet is small, takes existing number
The wasting of resources is easily caused according to passage.Arrowband Internet of Things arises at the historic moment, and is low-power consumption, extensively connection, highly reliable business scenario are carried
For technical support.
Existing wide area internet of things service can be by GPRS technologies and wafer support, and by contrast, arrowband Internet of Things advantage is
Depth is covered, and power consumption of terminal is low, cost is low, supports extensive connection.GPRS chips can be operated in maximum coupling loss for 144dB
In the environment of, and arrowband Internet of Things chip, by arrowband and repeat system, coverage enhancement 20dB can be operated in maximum coupling loss
In the environment of 164dB.In addition, arrowband Internet of Things chip uses power-saving technique and enhanced discontinuous reception working method, pole
Power consumption is reduced greatly, ideally No. 5 batteries can continuous work for 10 years.
Arrowband Internet of Things supports bulk device connection.Up channel can use 3.75KHZ subcarrier spacings, can be by 180KHZ
It is divided into 48 channels, up equivalent power lifting；Base station and core net optimization, reduce space interface signaling expense, lifting frequency spectrum effect
Rate, greatly promotes channel capacity.In view of internet-of-things terminal huge number, it has to consider lower deployment cost.Existing GPRS moulds composition
This is relatively low, and arrowband Internet of Things module cost is lower, and single group cost is less than 5 dollars.The key for realizing low cost is narrowband systems,
Base band complexity is low；Using single antenna, half-duplex operation, radio frequency cost is low；Peak-to-average force ratio is low, and power amplification efficiency is high, can support
Integrated amplifier.
Depth covering is one of advantage of arrowband Internet of Things, and arrowband Internet of Things chip can be operated in maximum coupling loss and be
Under 164dB severe communication environment.According to different maximum coupling loss, arrowband internet-of-things terminal can be divided into CE0, CE1,
Tri- covering grades of CE2, correspond to the working environment that maximum coupling loss is 144dB, 154dB and 164dB respectively.Realize that depth is covered
The technological means of lid includes：
(1) it is only 3.75KHZ that, Internet of Things chip belt in arrowband is wide, under same power, significant increase power spectral density,
Signal intensity is increased, communication range is expanded；, can be according to different covering etc. using the leading scheme of brand-new single-tone frequency hopping
Level sets different leading sending times.Maximum coupling loss reaches 164dB terminal, and leading maximum number of retransmissions can be set and is
120, it is favorably improved detection of preamble success rate.
(2), the different leader resource of the different covering grade correspondence of arrowband Internet of Things, different brackets terminal should select correspondence
Leading accessed.If the leading of correspondence CE is not present in current time slots, access request is delayed to ensuing effective by continuation
Access slot.
(3), different leading sending times are set according to different covering grades, and the repetition for retransmitting digit symbol group is sent.
In single-tone frequency-hopping method, for reduction CP expenses, every 5 symbols add a CP, referred to as one set of symbols.Single-tone frequency-hopping method
In, single-tone refers to the subcarrier that up channel uses 3.75KHZ, and division 180KHZ is 48 sub-channels；Between frequency hopping digit symbol group
Frequency hopping, different hopping patterns represent different leading.Selection is different leading to select different frequency hoppings to originate son
Carrier wave
Arrowband Internet of Things has enjoyed equipment manufacturers, mobile operator concerns since emerge, following or will build up whole city
City covers an arrowband Internet of Things net, and the current Internet of Things Market and Technology of improvement is numerous and disorderly, the present situation of the bad coordination of business.
The content of the invention
Propose the accidental access method limited in a kind of arrowband Internet of Things (arrowband Internet of Things) based on dynamic access, it is therefore an objective to
That improves delay sensitive terminal is successfully accessed rate first, i.e., reduce its access delay to greatest extent.Method implementation steps are：
(1) arrowband internet-of-things terminal, is divided into the first kind and Equations of The Second Kind, the wherein first kind according to the sensitiveness to time delay
Terminal requires lower time delay than Equations of The Second Kind；
(2), all terminals are set to produce an access parameter P, wherein the access parameter perseverance of the first Terminal Type is 0, note
Make P1, the access parameter of the second Terminal Type generates at random in (0,1), is denoted as P2；
(3), according to existing available leader resource, the maximum accessible access request number M of estimation single.All terminals with
Machine access base station, one access probability factor δ of number of terminals N dynamic broadcasts that base station is accessed according to current request.If certain terminal connects
Enter parameter P<δ, then allow the terminal to access；If certain terminal access parameter P >=δ, the terminal access request is delayed by；
(4) terminal of access, is allowed to use competitive mode cut-in method, random selection is leading and is sent to base station.If multiple
Terminal selection is same leading, and these terminal access failures are assert in base station, and failure terminal can be in next access slot re-request
Access；If base station detects certain and leading only selected by terminal, then it is assumed that the terminal is successfully accessed, and to the terminal feedback one
Individual timing adjustment and the uplink data channels message related to resources of distribution.
Wherein, arrowband internet-of-things terminal uses special arrowband Internet of Things chip module, and arrowband is used between terminal and base station
Technology of Internet of things communicates.
In step (1), the first Terminal Type, the partitioning standards of the second Terminal Type are the different claimed ranges to time delay.Assuming that
Delay threshold is γ, if demanding terminal maximum delay is less than γ, is divided into the first Terminal Type；If demanding terminal time delay can surpass
γ is crossed, the second Terminal Type is divided into.
In step (2), each terminal produces an access parameter, and the effect of the access parameter is connect with base station broadcast
Enter probability factor to make comparisons, only access parameter just allows to be accessed less than the terminal of access probability factor, so that limiting terminal
Access amount, reduce access interference.
The access parameter of first Terminal Type is set in advance, i.e., after dividing terminal class according to delay threshold, the first kind is whole
The access parameter at end is set to 0.The access parameter of second Terminal Type is that independent random is produced, i.e., each terminal initiates access
The random access parameter between one (0,1) is produced while request, and the generation of each terminal random number is separate, mutually not
Influence.
In step (3), M is the maximum accessible access request number of single under existing leader resource.Assuming that leading number is
K, the total access request number of the first kind, the second Terminal Type is m.Using competitive mode cut-in method, m terminal is random from k leading
Selection m is sent to base station.Assuming that certain terminal have selected, some is leading, then other m-1 terminal will not select this leading general
Rate isThe leading selection of each terminal-pair etc. is general and separate.According to probability statistics principle, m terminal is accessed first
Successfully number isIfThen m terminal almost all is successfully accessed.Defining M is
The maximum accessible access request number of single under existing leader resource：M=max<m>, whenWherein<m
>M rounds are represented, max { } represents to take maximum.MeetM value more than one, but one
Number value set, here M take the maximum for the m for meeting constraints, constraints is less than 0.1 and ensures that now m terminal is with big
Probability is all successfully accessed.
In step (3), access probability factor δ changes with the first kind, the number dynamic that is currently accessed of the second Terminal Type.Note is current
Access request sum is N, wherein the first Terminal Type access request number is N1, can be single maximum under k, Current resource with the number of derivatives
Accessible number of request is M.Define δ calculation formula be：
One access probability factor δ of base station dynamic broadcast, to limit the terminal number for allowing access.First Terminal Type is set
P1≡ 0, so P1<δ perseverances are set up, it is ensured that the first Terminal Type is accessed first to be allowed to.If δ=0.4, the second Terminal Types are produced at random
Raw P2Average probability less than δ is about 0.4, i.e., about 40% the second Terminal Type allows to be accessed, and common with the first Terminal Type
It is same to take competitive mode cut-in method.
If certain terminal access parameter P >=δ, the terminal access request is not allowed in current time slots, i.e., the terminal is accessed
Request is delayed by.The terminal being delayed by is asked to resend access request in next time slot, but each terminal is set
There is the access sending times M of maximumReattempt, when some terminal retransmits the number of times of access request more than MReattempt, declaration is this time
Access failure.Terminal need to keep out of the way after a period of time, and new access request is initiated again.
In step (4), it is allowed to which the terminal of access carries out access processing using competitive mode cut-in method.Competitive mode cut-in method
Referring to allows each terminal of access, compete limited k it is leading, it is independent, random from k leading middle one transmission of selection
To base station.Only all terminals each select different leading, just can guarantee that all terminals are successfully accessed.
Base station successfully be detected some it is leading after, include leading sequence number, timing adjustment to selecting the leading terminal to send
And the message of uplink data channels resource allocation, the leading sequence number of terminal recognition, and the uplink data channels hair provided using base station
Send data message.The channel that terminal is each distributed using base station sends data message, in the absence of channel resource collision problem.
δ computational methods are defined by formula noted earlier.K is leading number, under being a definite value, existing leader resource
The maximum accessible access request number M of single is only relevant with k, i.e. M is also definite value.δ connects according to total access number N with the first Terminal Type
Enter several N1Dynamic change：
If (a), total access number is no more than the maximum accessible access request number M of single under current leader resource, set δ=
1, all terminals are all allowed to access；
If (b), total access number exceedes the maximum accessible access request number M of single under current leader resource, and first
Terminal Type number of request is less than M, then δ depends on total access number N, the first Terminal Type access number N1, present single maximum it is accessible
Access request number M；
If (c), total access number exceedes the maximum accessible access request book M of single under current leader resource, and first
Terminal Type access request number is all limited also above M, the then request of all second Terminal Types, only allows the first Terminal Type to access, δ
=0.01 can effectively limit the request of the second Terminal Type.
Beneficial effect
The accidental access method proposed by the present invention limited based on dynamic access, by setting, different access parameters, excellent
First ensure the access of delay sensitive terminal, effectively increase delay sensitive terminal is successfully accessed rate first, drops to greatest extent
Its low access delay, it is ensured that it meets delay requirement.
Brief description of the drawings
Fig. 1 is cut-in method flow chart of the present invention.
Fig. 2 is the specific works pattern of dynamic access grade restricted part in cut-in method.
Fig. 3 is not use dynamic access method for limiting and the first Terminal Type maximum access using dynamic access method for limiting
Time delay.
Fig. 4 is not use dynamic access method for limiting and the second Terminal Type maximum access using dynamic access method for limiting
Time delay.
Embodiment
Below in conjunction with the accompanying drawings, the present invention is further described.
Propose the accidental access method limited in a kind of arrowband Internet of Things (arrowband Internet of Things) based on dynamic access, it is therefore an objective to
That improves delay sensitive terminal is successfully accessed rate first, i.e., reduce its access delay to greatest extent.Method implementation steps are：
(1) arrowband internet-of-things terminal, is divided into the first kind and Equations of The Second Kind, the wherein first kind according to the sensitiveness to time delay
Terminal requires lower time delay than Equations of The Second Kind；
(2), all terminals are set to produce an access parameter P.The access parameter perseverance for setting the first Terminal Type is 0, note
Make P1；The access parameter of second Terminal Type is generated at random in (0,1), is denoted as P2；
(3), according to existing available leader resource, the maximum accessible access request number M of estimation single.All terminals with
Machine access base station, one access probability factor δ of number of terminals N dynamic broadcasts that base station is accessed according to current request.If certain terminal connects
Enter parameter P<δ, then allow the terminal to access；If certain terminal access parameter P >=δ, the terminal access request is delayed by；
(4) terminal of access, is allowed, using competitive mode cut-in method, random selection is leading and is sent to base station.If multiple
Terminal selection is same leading, and these terminal access failures are assert in base station, and failure terminal can be in next access slot re-request
Access；If base station detects certain and leading only selected by terminal, then it is assumed that the terminal is successfully accessed, and to the terminal feedback one
Individual timing adjustment and the uplink data channels message related to resources of distribution.
Specific works step refers to flow chart Fig. 1, Fig. 2.
Wherein, arrowband internet-of-things terminal uses special arrowband Internet of Things chip module, and arrowband is used between terminal and base station
Technology of Internet of things communicates.
In step (1), the first Terminal Type, the partitioning standards of the second Terminal Type are the different claimed ranges to time delay.Assuming that
Delay threshold is γ, if demanding terminal maximum delay is less than γ, is divided into the first Terminal Type；If demanding terminal time delay can surpass
γ is crossed, the second Terminal Type is divided into.
In step (2), each terminal produces an access parameter, and the effect of the access parameter is connect with base station broadcast
Enter probability factor to make comparisons, only access parameter just allows to be accessed less than the terminal of access probability factor, so that limiting terminal
Access amount, reduce access interference.
The access parameter of first Terminal Type is set in advance, i.e., after dividing terminal class according to delay threshold, the first kind is whole
The access parameter at end is set to 0.The access parameter of second Terminal Type is that independent random is produced, i.e., each terminal initiates access
The random access parameter between one (0,1) is produced while request, and the generation of each terminal random number is separate, mutually not
Influence.
In step (3), M is the maximum accessible access request number of single under existing leader resource.Assuming that leading number is
K, the total access request number of the first kind, the second Terminal Type is m.Using competitive mode cut-in method, m terminal is random from k leading
Selection m is sent to base station.Assuming that certain terminal have selected, some is leading, then other m-1 terminal will not select this leading general
Rate isThe leading selection of each terminal-pair etc. is general and separate.According to probability statistics principle, m terminal is accessed first
Successfully number isIfThen m terminal almost all is successfully accessed.Defining M is
The maximum accessible access request number of single under existing leader resource：M=max<m>, whenWherein<m
>M rounds are represented, max { } represents to take maximum.MeetM value more than one, but one
Number value set, here M take the maximum for the m for meeting constraints, constraints is less than 0.1 and ensures that now m terminal is with big
Probability is all successfully accessed.
In step (3), access probability factor δ changes with the first kind, the number dynamic that is currently accessed of the second Terminal Type.Note is current
Access request sum is N, wherein the first Terminal Type access request number is N1, can be single maximum under k, Current resource with the number of derivatives
Accessible number of request is M.Define δ calculation formula be：
One access probability factor δ of base station dynamic broadcast, to limit the terminal number for allowing access.First Terminal Type is set
P1≡ 0, so P1<δ perseverances are set up, it is ensured that the first Terminal Type is accessed first to be allowed to.If δ=0.4, the second Terminal Types are produced at random
Raw P2Average probability less than δ is about 0.4, i.e., about 40% the second Terminal Type allows to be accessed, and common with the first Terminal Type
It is same to take competitive mode cut-in method.
If certain terminal access parameter P >=δ, the terminal access request is not allowed in current time slots, i.e., the terminal is accessed
Request is delayed by.The terminal being delayed by is asked to resend access request in next time slot, but each terminal is set
There is the access sending times M of maximumReattempt, when some terminal retransmits the number of times of access request more than MReattempt, declaration is this time
Access failure.Terminal need to keep out of the way after a period of time, and new access request is initiated again.
In step (4), it is allowed to which the terminal of access carries out access processing using competitive mode cut-in method.Competitive mode cut-in method
Referring to allows each terminal of access, compete limited k it is leading, it is independent, random from k leading middle one transmission of selection
To base station.Only all terminals each select different leading, just can guarantee that all terminals are successfully accessed.
Base station successfully be detected some it is leading after, include leading sequence number, timing adjustment to selecting the leading terminal to send
And the message of uplink data channels resource allocation, the leading sequence number of terminal recognition, and the uplink data channels hair provided using base station
Send data message.The channel that terminal is each distributed using base station sends data message, in the absence of channel resource collision problem.
δ computational methods are defined by formula noted earlier.K is leading number, under being a definite value, existing leader resource
The maximum accessible access request number M of single is only relevant with k, i.e. M is also definite value.δ connects according to total access number N with the first Terminal Type
Enter several N1Dynamic change, it is characterised in that：
If (a), total access number is no more than the maximum accessible access request number M of single under current leader resource, set δ=
1, all terminals are all allowed to access；
If (b), total access number exceedes the maximum accessible access request number M of single under current leader resource, and first
Terminal Type number of request is less than M, then δ depends on total access number N, the first Terminal Type access number N1, present single maximum it is accessible
Access request number M；
If (c), total access number exceedes the maximum accessible access request book M of single under current leader resource, and first
Terminal Type access request number is all limited also above M, the then request of all second Terminal Types, only allows the first Terminal Type to access, δ
=0.01 can effectively limit the request of the second Terminal Type.
Because the terminal of different covering grades is using different leading, for ease of analysis, by taking CE2 terminals as an example.Modeling parameters
As shown in table 1, terminal access procedure obeys Beta distributions.
The modeling parameters of table 1
| NB-IoTTerminal number/cell | 50000 |
| Average access request number/day | 15 |
| CE 2 can use leading number | 48 |
| A Terminal Type accountings | 20% |
| B Terminal Type accountings | 80% |
| The NPRACH cycles (s) | 0.96 |
| NPRACH time slots (s) | 0.24 |
| Beta (α, β) | α=3, β=4, T=500 |
Through analysis, the accidental access method limited in the arrowband Internet of Things of this invention based on dynamic access, compared to not
Using traditional access scheme of this method, the maximum access delay of the first Terminal Type is effectively reduced, cost is sacrificial to a certain extent
The domestic animal access delay of Equations of The Second Kind.Concrete outcome is as shown in Figure 3, Figure 4.
It is described above be only the present invention be preferable to carry out method, it should be pointed out that：For the ordinary skill people of the art
For member, under the premise without departing from the principles of the invention, some improvements and modifications can also be made, these improvements and modifications also should
It is considered as protection scope of the present invention.
Claims (6)
1. the accidental access method limited in a kind of arrowband Internet of Things based on dynamic access, it is characterised in that comprise the following steps：
(1) arrowband internet-of-things terminal, is divided into the first kind and Equations of The Second Kind according to the sensitiveness to time delay, wherein the first Terminal Type
Lower time delay is required than Equations of The Second Kind；
(2), set all terminals to produce an access parameter P, wherein the access parameter perseverance of the first Terminal Type is 0, be denoted as P1,
The access parameter of second Terminal Type is generated at random in (0,1), is denoted as P2；
(3), according to existing available leader resource, the access request number M of estimation single maximum reason；All terminal Stochastic accessings
Base station, one access probability factor δ of number of terminals N dynamic broadcasts that base station is accessed according to current request；If certain terminal access parameter P
<δ, then allow the terminal to access；If certain terminal access parameter P >=δ, the terminal access request is delayed by；
(4) terminal of access, is allowed to use competitive mode cut-in method, random selection is leading and is sent to base station；If multiple terminals
Select same leading, these terminal access failures are assert in base station, failure terminal is accessed in next access slot re-request；If
Base station detects certain and leading only selected by terminal, then it is assumed that the terminal is successfully accessed, and to one timing of the terminal feedback
Adjustment and the uplink data channels message related to resources of distribution；
Wherein, arrowband internet-of-things terminal uses special arrowband Internet of Things chip module, and arrowband Internet of Things is used between terminal and base station
Network technology communicates.
2. the method as described in claim 1, it is characterised in that in step (1), the first Terminal Type, the division of the second Terminal Type
Foundation is the different claimed ranges to time delay；Assuming that delay threshold is γ, if demanding terminal maximum delay is less than γ, divided
For the first Terminal Type；If demanding terminal time delay can exceed γ, the second Terminal Type is divided into.
3. the method as described in claim 1, it is characterised in that in step (2), each terminal produces an access parameter,
The effect of the access parameter is made comparisons with the access probability factor of base station broadcast, and only access parameter is less than access probability factor
Terminal just allow to be accessed so that the access amount of limiting terminal, reduce access interference；
The access parameter of first Terminal Type is set in advance, i.e., according to delay threshold divide terminal class after, the first Terminal Type
Access parameter is set to 0；The access parameter of second Terminal Type is that independent random is produced, i.e., each terminal initiates access request
While produce random access parameter between one (0,1), and the generation of each terminal random number is separate, mutually not shadow
Ring.
4. the method as described in claim 1, it is characterised in that in step (3), M is single maximum under existing leader resource
The access request number of reason；Assuming that leading number is k, the total access request number of the first kind, the second Terminal Type is m；Connect using competitive mode
Enter method, m terminal is random to be sent to base station from k leading middle selection m；Assuming that certain terminal have selected, some is leading, then its
The probability that his m-1 terminal will not select this leading isThe leading selection of each terminal-pair etc. is general and separate；M
The number that terminal is successfully accessed first isIfThen m terminal almost all access
Success；It is the maximum accessible access request number of single under existing leader resource to define M：M=max<m>, whenWherein<m>M rounds are represented, max { } represents to take maximum；MeetM value more than one, a but number value set, here M take the maximum for the m for meeting constraints,
Constraints is less than 0.1 and ensures that now m terminal is all successfully accessed with maximum probability.
5. the method as described in claim 1, it is characterised in that in step (3), access probability factor δ is with the first kind, Equations of The Second Kind
The number dynamic that is currently accessed of terminal changes；It is N that note, which is currently accessed request sum, wherein the first Terminal Type access request number is N1,
It is that the maximum accessible number of request of single is M under k, Current resource with the number of derivatives, the calculation formula for defining δ is：
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<mn>1</mn>
</msub>
<mo>&GreaterEqual;</mo>
<mi>M</mi>
</mtd>
</mtr>
</mtable>
</mfenced>
</mrow>
One access probability factor δ of base station dynamic broadcast, to limit the terminal number for allowing access；First Terminal Type P is set1≡
0, so P1<δ perseverances are set up, it is ensured that the first Terminal Type is accessed first to be allowed to；If δ=0.4, the second Terminal Types are randomly generated
P2Average probability less than δ is about 0.4, i.e., about 40% the second Terminal Type allows to be accessed, and is adopted jointly with the first Terminal Type
Take competitive mode cut-in method；
If certain terminal access parameter P >=δ, the terminal access request is not allowed in current time slots, i.e. the terminal access request
It is delayed by；The terminal being delayed by is asked to resend access request in next time slot, but each terminal is both provided with most
Big access sending times MReattempt, when some terminal retransmits the number of times of access request more than MReattempt, declaration this time access
Failure；Terminal need to keep out of the way after a period of time, and new access request is initiated again.
6. the method as described in claim 1, it is characterised in that in step (4), it is allowed to which the terminal of access is accessed using competitive mode
Method carries out access processing；Competitive mode cut-in method, which is referred to, allows each terminal of access, and competition limited k is leading, solely
It is vertical, random to be sent to base station from k leading middle selections one；Only all terminals each select different leading, just can guarantee that
All terminals are successfully accessed；
Base station successfully be detected some it is leading after, to select the leading terminal to send to include leading sequence number, timing adjustment and on
The message of row data channel resource allocation, the leading sequence number of terminal recognition, and the uplink data channels provided using base station send number
It is believed that breath；The channel that terminal is each distributed using base station sends data message；
K is leading number, is that the maximum accessible access request number M of single only has with k under a definite value, existing leader resource
Close, i.e. M is also definite value；δ accesses number N according to total access number N and the first Terminal Type1Dynamic change：
If (a), total access number is no more than the maximum accessible access request number M of single under current leader resource, δ=1, institute are set
There is terminal to be all allowed to access；
If (b), total access number exceedes the maximum accessible access request number M of single under current leader resource, and the first kind is whole
Number of request is held to be less than M, then δ depends on total access number N, the first Terminal Type access number N1, the maximum accessible access of present single
Number of request M；
If (c), total access number exceedes the maximum accessible access request book M of single under current leader resource, and the first kind is whole
Terminate into number of request also above M, then the request of all second Terminal Types is all limited, only allow the first Terminal Type to access, δ=
0.01 effectively limits the request of the second Terminal Type.
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