CN108401265A - A kind of random access control method for machine-to-machine communication - Google Patents
A kind of random access control method for machine-to-machine communication Download PDFInfo
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- CN108401265A CN108401265A CN201710069886.9A CN201710069886A CN108401265A CN 108401265 A CN108401265 A CN 108401265A CN 201710069886 A CN201710069886 A CN 201710069886A CN 108401265 A CN108401265 A CN 108401265A
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- 238000000034 method Methods 0.000 title claims abstract description 31
- 238000004891 communication Methods 0.000 title claims abstract description 11
- 238000012163 sequencing technique Methods 0.000 claims abstract description 42
- 230000008685 targeting Effects 0.000 claims abstract description 42
- 230000001413 cellular effect Effects 0.000 claims abstract description 36
- 238000001514 detection method Methods 0.000 claims abstract description 10
- 238000013468 resource allocation Methods 0.000 abstract description 7
- 230000011664 signaling Effects 0.000 description 11
- 230000005540 biological transmission Effects 0.000 description 9
- 238000005516 engineering process Methods 0.000 description 6
- 230000001960 triggered effect Effects 0.000 description 4
- 239000000969 carrier Substances 0.000 description 2
- 230000008569 process Effects 0.000 description 2
- 238000001228 spectrum Methods 0.000 description 2
- 230000008859 change Effects 0.000 description 1
- 230000001419 dependent effect Effects 0.000 description 1
- 230000006870 function Effects 0.000 description 1
- 238000007689 inspection Methods 0.000 description 1
- 238000004080 punching Methods 0.000 description 1
Classifications
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W24/00—Supervisory, monitoring or testing arrangements
- H04W24/10—Scheduling measurement reports ; Arrangements for measurement reports
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W72/00—Local resource management
- H04W72/12—Wireless traffic scheduling
- H04W72/1263—Mapping of traffic onto schedule, e.g. scheduled allocation or multiplexing of flows
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W72/00—Local resource management
- H04W72/50—Allocation or scheduling criteria for wireless resources
- H04W72/54—Allocation or scheduling criteria for wireless resources based on quality criteria
-
- 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
- H04W74/0833—Random access procedures, e.g. with 4-step access
- H04W74/0841—Random access procedures, e.g. with 4-step access with collision treatment
- H04W74/0858—Random access procedures, e.g. with 4-step access with collision treatment collision detection
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- Computer Networks & Wireless Communication (AREA)
- Signal Processing (AREA)
- Quality & Reliability (AREA)
- Mobile Radio Communication Systems (AREA)
Abstract
The invention discloses a kind of random access control methods for machine-to-machine communication.This approach includes the following steps：Machine sends targeting sequencing to the cellular device as gateway；Cellular device executes initial stage collision detection according to targeting sequencing, and random access examining report is sent to evolved base station；Evolved base station distributes random access resource according to random access examining report.The invention avoids concealed nodes and exposed node problems, and dynamic resource allocation is carried out to random access request information, realize resource multiplex and the multiplexing of opportunistic random access guiding.
Description
Technical field
The present invention relates to a kind of random access control method more particularly to a kind of connecing at random for machine-to-machine communication
Access control method belongs to internet of things field.
Background technology
In following world Internet of Things (internet of things), machine-to-machine communication (Machine-to-
Machine, abbreviation M2M) it is considered as one of wherein most important Form of Technique.M2M technologies lay particular emphasis on the interconnection of mobile terminal
And serial Communication, it is the main internet of things service field of communications carrier.Currently, how by wireless sensor, sensor network
Deep integrating is carried out with cellular wireless system, is still one of the technical problem underlying of urgent need to resolve in M2M technologies.
Fig. 1 is shown in the prior art, and a solution example of M2M technologies is realized in cellular wireless system.It should
System include evolved base station (abbreviation eNB), it is multiple as M2M gateways cellular device/user equipment (in Fig. 1 with UE A,
For UE B, UE C and UE D) and multiple M2M machines (abbreviation machines being connect respectively with cellular device/user equipment
Device).Wherein, only there are one air interfaces (LTE TDD) for M2M machines, and the downlink of shared FDD/TDD cellular wireless systems is believed
The frequency spectrum in road.As shown in Figure 1, different machine needs will count with the help of cellular device/user equipment as M2M gateways
According to being sent to evolved base station.In this, it is assumed that all cellular device/user equipmenies as gateway are all in RRC (radio
Resource control, wireless heterogeneous networks) connection mode.
Wherein, evolved base station uses the down channel and up channel of cellular system using FDD modes, and in downlink
Signal is sent to machine and cellular device (M2M gateways) on carrier wave, is only connect from the cellular device as gateway on up-link carrier
The collection of letters number.
Cellular device/user equipment (having the ability for serving as M2M gateways or sensor gateway, abbreviation gateway UE) uses
FDD modes use the up channel and down channel of cellular system.Signal is sent to evolved base station on up-link carrier, under
On row carrier wave signal is received from machine and evolved base station.
Machine uses the down channel resources of cellular system using TDD modes.On the downstream carriers to cellular device or can
Selection of land sends signal to other machines, and receives signal on the downstream carriers from evolved base station or optionally from other machines.
The congestion problems of random access channel (RACH) are in 3 gpp by extensive discussions, wherein a large amount of machine may
It is triggered by the same event, starts simultaneously at their random access procedure.Due to the RACH limited amounts in LTE, such case
Serious congestion will inevitably be caused, because many machines will be attempted to access on the same RACH.
For the scene in Fig. 1, it is a kind of alleviate RACH congestions solution be realize resource multiplex, two of which is apart
Far machine can use identical radio resource simultaneously, and random access request information is sent to their corresponding gateway UE.
In order to realize this multiplexing, one needs the machine for carrying out random access that a Seize ACK message will be sent to occupy in advance then first
It is used for transmission the reserved resource of random access request information.Detailed machine identification (ID) is contained in random access request information
With relevant information.After gateway UE is successfully received random access request information, it will be by Dedicated Signaling Channel information
It is transmitted to evolved base station.In this solution, there are two main functions for Seize ACK message：
(1) pre- conflict control is carried out by Seize ACK message：Any machine for hearing Seize ACK message within a certain period of time will not
Seize ACK message can be sent.Therefore Seize ACK message only is had sent (in the ideal case) there are one machine, it will use reserved money
Source sends its random access request information.Other machines will postpone their random access to next random access week
Phase.It should be noted that when two machines send Seize ACK message simultaneously, and when they do not detect other side, in reserved money
It may also can be clashed on source.
(2) multiplexing control：Due to not detecting that the machine of any Seize ACK message can send Seize ACK message, it is accordingly used in
Sending the reserved resource of random access request information can be multiplexed by the machine of wide apart.If a machine due to it is other
Machine wide apart and can not hear any Seize ACK message, then it undoubtedly can with multiplexed resource carry out low-power random access
Request message transmission.
But problems with is still had in above-mentioned solution：
(1) because machine the same time can be only in detecting state or in send Seize ACK message state,
It is executed on a series of M2M RACH (being used for transmission Seize ACK message) that pre- conflict control can only be in the time domain.
(2) it is to be reserved in advance to be used to send the resource of random access request information, can not be according to the load of request
Situation dynamically changes.Therefore, once a large amount of machines are triggered, their random access procedure will undergo very long time delay.
(3) because whether the execution of multiplexing monitors Seize ACK message, therefore hidden node problem and exposure depending on machine
Node problems will reduce the efficiency of resource multiplex.
Hidden node problem:This problem is as shown in Figure 2.When machine M1 sends Seize ACK message, machine M2 farther out from M1,
Therefore M2 can not hear Seize ACK message, M2 can send the Seize ACK message of own to the same gateway UE.Subsequent random
In the transmission of access request information, the signal that M2 is sent will interfere the signal of M1 transmissions.
Exposed node problems:This problem is as shown in Figure 3.Machine M1 and M2 originally can be with multiplexed resources, because they are right
The interference of UEA and UEB is acceptable.But because M2 can hear the Seize ACK message of M1, therefore M2 will not be multiplexed money
Source carries out the transmission of random access request information.
(4) since random access request information is only transmitted to evolved base station by gateway UE, evolved base station can not obtain
The information of resource multiplex.Therefore, evolved base station can not consider the case where resource multiplex, be adjusted to the business of the following machine
Degree.
Invention content
Technical problem to be solved by the present invention lies in provide a kind of random access control for machine-to-machine communication
Method.
For achieving the above object, the present invention uses following technical solutions：
A kind of random access control method for machine-to-machine communication includes the following steps：
Machine sends targeting sequencing to the cellular device as gateway；
The cellular device executes initial stage collision detection according to the targeting sequencing, and random access is sent to evolved base station
Examining report；
The evolved base station distributes random access resource according to the random access examining report.
Wherein more preferably, the targeting sequencing mark that the cellular device was detected do not conflict is sent to described drill
Into type base station.
Wherein more preferably, the random access examining report includes format field, the format for indicating the targeting sequencing.
Wherein more preferably, the format field indicates to use bitmap mode or length wise using different value respectively.
Wherein more preferably, the random access examining report using length wise indicate the targeting sequencing when, including
The format field and length field.
Wherein more preferably, the evolved base station is only that the cellular device each of reports different targeting sequencing distribution
Resource.
Wherein more preferably, when two cellular devices report identical targeting sequencing, the evolved base station is
Described two cellular devices distribute identical resource.
Wherein more preferably, the cellular device is reported based on it the targeting sequencing and evolved base station distribution
Resource determines reception behavior features.
Compared with prior art, random access control method provided by the present invention avoids concealed nodes and exposure saves
The problem of point, carries out dynamic resource allocation to random access request information, realizes resource multiplex and opportunistic connect at random
Enter leading multiplexing.
Description of the drawings
Fig. 1 is to realize a solution exemplary plot of M2M technologies in cellular wireless system；
Fig. 2 is the flow chart of random access control method provided by the present invention；
Fig. 3 is a kind of format sample figure of random access examining report in the present invention.
Specific implementation mode
It is further to the technology contents expansion of the present invention in the following with reference to the drawings and specific embodiments to be described in detail.
The shortcomings that in order to overcome the prior art, and RACH congestion problems, the present invention is avoided to propose (to have the ability to make by gateway UE
For the cellular device of gateway) collision detection at initial stage is carried out to the random access leader sequences of M2M machines.Then, gateway UE to
Evolved base station sends a random access examining report.
Hereafter, the random access examining report based on all gateway UE, it is multiple that evolved base station can obtain enough resources
Use information.Therefore, the case where resource multiplex can be considered in evolved base station, to back to back random access request information and future
The business of machine carries out resource allocation.
Each gateway UE can be according to the random access leader sequence reported before it and then from evolved base station
It is adjusted with the relevant PDCCH of random access (physical downlink control channel, Physical Downlink Control Channel)
Degree, to automatically determine the reception behavior features for sending signal to machine.It therefore, there is no need to add additional signaling and come notification gateway UE's
Reception behavior features, signaling overheads can reduce.
Random access control method provided by the present invention includes mainly four features：First be gateway UE initial stage punching
Prominent detection and the random access examining report for being subsequently sent to evolved base station.Second is that evolved base station considers resource multiplex
To the resource allocation algorithm of random access request information after situation.Third is gateway UE according to the targeting sequencing reported before it
It is dispatched with the relevant PDCCH of random access, automatically determines its reception behavior features.4th be evolved base station can utilize with
Machine accesses the multiplexed information in examining report, considers the resource multiplex between machine, is scheduled to the business in machine future.
As shown in Fig. 2, random access control method provided by the present invention includes the following steps：
Step a：Machine randomly chooses a random access leader sequence from predefined targeting sequencing group, and sends
To the cellular device as gateway.
In M2M system scenarios as shown in Figure 1, after machine obtains the location information of RACH, they will random selection
One delay, and a random access leader sequence is randomly choosed from predefined targeting sequencing group, then in random access
On channel random access leader sequence is sent after randomly selected delay.It should be noted that the fields M2M discussed herein
Jing Zhong, RACH are in downstream spectrum, its position can be notified by evolved base station by broadcast channel.M2M machines
After device sends the targeting sequencing to the cellular device, only gateway UE can detect the targeting sequencing that all machines are sent, because
This not will produce hidden node problem in the prior art or exposed node problems.
Essentially, there are two types of the selection modes of machine random access leader sequence.It is new if it is machine definitions
Random access radio network temporary identifier (RA-RNTI), then the random access of machine will not interfere with completely cellular device/
The random access of user equipment, because using RACH in uplink frame compared to cellular device/user equipment, machine is in downlink
Different RACH is used in frame.In this case, machine and gateway UE can be multiplexed phase in their random access procedure
Same targeting sequencing group.
In another option, existing LTE RA-RNTI be both used for the random access of gateway UE, were also used for machine
Random access, the honeycomb targeting sequencing group of script will be divided into two subsets：One is used for gateway UE；Another is used for machine
Device.At this moment, the random access of gateway UE will be influenced by the random access of machine, although need not be changed to RA-RNTI.
Step b：Gateway UE executes collision detection, and sends random access examining report to base station.
After machine sends random access leader sequence, the gateway UE in the present invention by the collision detection at the initial stage that executes, with
Local conflict is found, i.e., local machine conflict will be directly detected by gateway UE, before the random access only not conflicted
Evolved base station can be just reported to by leading sequence.
Certainly in some special circumstances, two machines can send identical targeting sequencing to the same gateway UE simultaneously.
In this case gateway UE will be unable to find conflict, until next two machines send random access request on the same resource
Failure.
In the early stage after collision detection, the targeting sequencing mark not conflicted detected will be passed through dedicated signaling by gateway UE
Channel reporting is to evolved base station.Because assuming gateway UE in the present invention in RRC connection status, therefore each gateway
UE has the Dedicated Signaling Channel of one and evolved base station.
In addition, indicating the targeting sequencing detected in random access examining report there are two types of method.One is by every
The serial number (sequence number, SN) of a targeting sequencing detected.Another kind is the method by bitmap.It should be noted that
Be different method and can generate different signaling overheadss in report information.For example, when the targeting sequencing quantity that detect compared with
When few, the representation of serial number may be more effective.And when the targeting sequencing quantity detected is more, the representation of bitmap
It may be more effective.
In the present invention, the quantity of the targeting sequencing sent based on the machine detected is dynamically selected one by gateway UE
A suitable format.Therefore the signaling format of random access examining report will include a domain " F " (format field), be used to indicate report
Accuse the format used.A kind of example of format as shown in figure 3, wherein domain " Len " (length field) will be inserted into after the domain " F ",
It is used to indicate the length of subsequent " SN " (serial number) information.If define 64 random access leader sequences for M2M with
Machine accesses, then each serial number needs 6 bits to identify a random access leader sequence.In this case, if inspection
The targeting sequencing quantity measured is more than 10, and the representation of bitmap has smaller signaling overheads.Therefore, 4 bits are used enough
In the domain " Len ".
It will appreciated by the skilled person that the present invention random access examining report signaling format, as
For scheme, it can also be to fix to use bitmap or format length, format field do not needed in signaling format at this moment.
Since LTE (considering real time voice traffic) can receive certain time delay, moreover, when many machines are triggered
When, the delay of random access procedure is not dependent on small time delay caused by accidental access signal processing, but is caused depending on conflict
Stand-by period.Therefore, the time delay that gateway UE is brought to evolved base station feedback random access examining report is can to receive
Degree.Furthermore the present invention has carried out dynamic resource allocation to random access request information, even if considering gateway UE to evolution
The time delay that type base station feedback random access examining report is brought, on the whole random access control method of the invention still can add
The process of fast machine random access.
Step c：Evolved base station considers resource multiplex, and the random access leader sequence mark each to report is distributed random
Access-in resource.
After evolved base station is collected into all random access examining reports from all gateway UE, evolved base station will consider
Resource multiplex between different gateway UE distributes resource for different random access leader sequences.Specifically, when two gateways
When UE reports an identical targeting sequencing, it need not separate and handle them, but them as the same targeting sequencing,
Identical resource is distributed for them, realizes resource multiplex.This is because only when can be with multiplexed resource between them, two
(or multiple) different gateway UE can just report an identical targeting sequencing.Otherwise, a gateway UE can detect two phases
Same targeting sequencing, this can be considered to be conflicted by gateway UE.Therefore, evolved base station only needs to report for gateway UE
Each different targeting sequencing distributes resource.If finding a targeting sequencing in the collection of this wheel random access leader sequence
It was reported by another gateway UE, and has been that it is assigned with resource, then evolved base station only needs to skip it,
Handle next random access leader sequence reported.Therefore, the PDCCH of evolved base station notice in, resource only need with
Different targeting sequencing associations.It is identical with traditional LTE, need not appoints with the relevant resource notification signaling of random access
What changes.
Step d：Machine sends random access request information according to the resource allocation of base station to gateway UE.
After machine, which is received, to be dispatched with the relevant PDCCH of random access, they sent before distributing to respectively with
Continue to send random access request information to gateway UE in the resource of machine access lead sequence.In random access request information,
Detailed information further can be transmitted to evolved base such as machine identification, service type, bandwidth request by gateway UE
It stands, therefore evolved base station can be the traffic assignments resource in machine future.
It should be noted that by using the information in random access examining report, different machines can be considered in evolved base station
Resource multiplex between device is the traffic assignments resource in machine future.Furthermore, it is not necessary that notifying them for random to gateway UE
The reception behavior features of access request information, because each gateway UE can be based on the targeting sequencing and evolved base station reported before it
Dispatched with the relevant PDCCH of random access, to determine its reception behavior features.
Step e：Gateway UE is dispatched based on random access leader sequence and the PDCCH of base station, determines reception behavior features.
The PDCCH that each gateway UE can be distributed based on the targeting sequencing and evolved base station reported before it, receives and
From the random access request information of machine, random access is realized.
Compared with prior art, the present invention has the following advantages：
1. hidden node problem and exposed node problems are avoided, because the recipient of random access leader sequence only has net
Close UE.Machine is not needed upon Seize ACK message detection to determine whether it sends random access leader sequence.
2. the dynamic resource allocation of pair random access request information.When many machines are triggered, more resources can be by
Transmission of the distribution for random access request information.Compared to the mode of reserved resource, dynamic allocation random access of the invention
The mode of resource can accelerate the process of machine random access.
3. evolved base station can obtain resource multiplexing information from random access examining report.Resource multiplex can be examined
Consider the transmission of the transmission and the following machine service for random access request information.
4. the present invention also achieves opportunistic random access leader sequence multiplexing.For example, when two distances farther out
Gateway UE detects the same random access leader sequence (coming from two different machines), and when no conflict occurred,
The random access of two machines can all succeed, although they have sent identical random access leader sequence.
Random access control method in M2M communication system provided by the present invention is described in detail above.It is right
For those of ordinary skill in the art, it is done under the premise of without departing substantially from true spirit any apparent
Change, all will constitute to infringement of patent right of the present invention, corresponding legal liabilities will be undertaken.
Claims (8)
1. a kind of random access control method for machine-to-machine communication, it is characterised in that include the following steps：
Machine sends targeting sequencing to the cellular device as gateway；
The cellular device executes initial stage collision detection according to the targeting sequencing, and random access detection is sent to evolved base station
Report；
The evolved base station distributes random access resource according to the random access examining report.
2. random access control method as described in claim 1, it is characterised in that：
The targeting sequencing mark that the cellular device was detected do not conflict is sent to the evolved base station.
3. random access control method as described in claim 1, it is characterised in that：
The random access examining report includes format field, the format for indicating the targeting sequencing.
4. random access control method as claimed in claim 3, it is characterised in that：
The format field indicates to use bitmap mode or length wise using different value respectively.
5. random access control method as described in claim 1, it is characterised in that：
The random access examining report using length wise when indicating the targeting sequencing, including the format field and length
Domain.
6. random access control method as claimed in claim 2, it is characterised in that：
The evolved base station is only that the cellular device each of reports different targeting sequencings to distribute resource.
7. random access control method as claimed in claim 6, it is characterised in that：
Resource of the cellular device based on its targeting sequencing and evolved base station distribution that report, determines to receive row
For.
8. random access control method as claimed in claim 6, it is characterised in that：
When two cellular devices report identical targeting sequencing, the evolved base station is described two cellular devices
Distribute identical resource.
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