CN106452974A - Random access resource allocation method based on D2D communication subgroups - Google Patents
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- 238000000034 method Methods 0.000 title claims abstract description 24
- 238000004891 communication Methods 0.000 title claims abstract description 20
- 238000013468 resource allocation Methods 0.000 title abstract 2
- 230000005540 biological transmission Effects 0.000 claims description 15
- 238000009826 distribution Methods 0.000 claims description 8
- 230000001174 ascending effect Effects 0.000 claims description 6
- 230000036967 uncompetitive effect Effects 0.000 claims description 4
- 238000001514 detection method Methods 0.000 claims description 3
- 238000012546 transfer Methods 0.000 description 6
- 238000012544 monitoring process Methods 0.000 description 5
- 238000001228 spectrum Methods 0.000 description 3
- 230000009286 beneficial effect Effects 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 238000010295 mobile communication Methods 0.000 description 2
- 230000008569 process Effects 0.000 description 2
- 230000011664 signaling Effects 0.000 description 2
- 239000002699 waste material Substances 0.000 description 2
- 230000002159 abnormal effect Effects 0.000 description 1
- 230000004913 activation Effects 0.000 description 1
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Classifications
-
- 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
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L43/00—Arrangements for monitoring or testing data switching networks
- H04L43/10—Active monitoring, e.g. heartbeat, ping or trace-route
- H04L43/103—Active monitoring, e.g. heartbeat, ping or trace-route with adaptive polling, i.e. dynamically adapting the polling rate
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W28/00—Network traffic management; Network resource management
- H04W28/02—Traffic management, e.g. flow control or congestion control
- H04W28/0215—Traffic management, e.g. flow control or congestion control based on user or device properties, e.g. MTC-capable devices
-
- 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
- H04W74/085—Random access procedures, e.g. with 4-step access with collision treatment collision avoidance
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- General Health & Medical Sciences (AREA)
- Mobile Radio Communication Systems (AREA)
Abstract
The invention discloses a random access resource allocation method based on D2D communication subgroups. The method comprises the following steps that S1.MTC equipment capable of executing D2D communication is divided into a plurality of subgroups; one main MTC equipment and the reset of slave MTC equipment are assigned in each subgroup; S2.a base station communicates with the main MTC equipment in a polling manner and allocates uplink resources to each main MTC equipment; S3.the slave MTC equipment competes for the uplink resources in the subgroups and the main MTC equipment arbitrates competition of the slave MTC equipment and reports an arbitration result to the base station; and S4.the base station allocates random access resources of the slave MTC equipment assigned by the arbitration result. According to the method, the resource utilization rate is improved and the real-time property under an Internet of Things application is improved.
Description
Technical field
The present invention relates to mobile Internet of Things field, the random access resource distribution of the subgroup that more particularly to communicated based on D2D
Method.
Background technology
Internet of Things (Internet of Things, abbreviation IoT) is the revolutionary evolution of current internet, from offer people
Be interconnected to the network interconnecting some equipment.The data perceiving or collect is converted into intelligent information by IoT, thus embedding for intelligence
Enter the living environment to us.Internet of Things application is related to many scenes, including：
■ smart home：The personal lifestyle pattern of family is strengthened, can more advantageously remote monitoring and operation man
Front yard equipment and system；
■ industrial automation：Depend on minimum human intervention, robot device control by computer complete manufacture times
Business；
■ intelligent medical：Embedded sensor and vibrator with patient or in medicine, for monitoring and following the tracks of patient；
■ intelligent grid：Power grid operation person can control accordingly and manage resource, so that the offer of electric power is proportional to people
The growth of mouth, the therefore power consumption of family and building can be strengthened；
■ smart city：There is provided information interested for resident in a straightforward manner, thus improving the quality of life in city；
For example need according to the people, the system of multiple interconnections can intelligently provide service interested, including traffic, infrastructure and doctor
Treat etc..
Current mobile communications network is for interpersonal communication scheme, defines conversational service, Streaming Media
All polymorphic types such as business, interactive service and background type business.It is associated with type of service, in network structure, protocol stack and biography
The aspects such as the design of defeated pattern are all for being adapted to these business, to ensure effectiveness, reliability, safety and the warp of information transfer
Ji property.
This kind of machine type communication of Internet of Things (Machine Type Communication, abbreviation MTC) business presents many
Plant characteristic, such as there is (or part has) Hypomobility, small data quantity and the transmission of non-frequent data item etc..For fleet management, water
Electric coal is checked meter and the application scenarios such as Distant supervision and control, also can present the characteristic of group, that is, application server is (as fleet
Management and running center) from one group of mobile terminal (vehicle) obtain information, and then command corresponding terminal behavior.In order to adapt to
The fast development of this kind of business, existing mobile communications network should adjust and strengthen accordingly, ensureing that traditional people-people is logical
On the basis of the service quality of letter, make great efforts to improve the performance of some internet of things services.
In the management to mobile terminal for the Mobile Access Network, it is provided with the state of two kinds of wireless heterogeneous networks (RRC)：Connect
(connected) state and idle (idle) state.When terminal is in connection status, it is flat that it has control and base station between
The signaling channel in face, now generally also has business datum being transmitted.When service ending for a period of time after, terminal can be transformed into
For idle condition, now terminate the signaling data path between same base station, base station can discharge more disposal abilities and
Storage capacity serves other terminals；But the safety information related to this terminal and positional information (can only achieve some
The TA rank of individual base station composition) still can retain in MME, it is easy to reduce the information between node when setting up and connecting next time
Exchange capacity.For the application of typical Internet of Things, application of such as checking meter is in the collection data instruction receiving application server initiation
Just report, delay warning and power failure etc. are to initiate Active report that is to say, that the data of terminal is lasting in abnormal generation
Transmission time can be very short, and the overwhelming majority is all in idle condition.Connection status to be transferred to for this terminal from idle condition, this
Process is to realize by Stochastic accessing (Random Access, abbreviation RA), wherein based on the random access procedure competing such as
Shown in Fig. 1.
1) signature (a corresponding Zadoff-Chu code sequence) set for competition specified by from base station for the mobile terminal
In select one at random, on pre-assigned running time-frequency resource transmit；
2) base station receives leading symbol, for detecting not responding of collision；It is not detected by the then supposition collided
Terminal apart from the distance of base station, direct base station so that how long lead send, to ensure that each terminal reaches the patrolling of base station
Collect apart from equal；It is terminal distribution Cell Radio Network Temporary Identifier/Identity, Cell-RNTI (C-RNTI) simultaneously；And the subsequent transmission of dispatch terminal；
3) terminal sends message, such as RRC connection message etc. on the running time-frequency resource of scheduling instruction；
4) message before base station in response, and give to arbitrate for competing the result whether conflicted.Base station receives in (1st) step
Leading symbol in it is possible to there are multiple terminal times using same signature upper close, beyond the time resolution of base station
Rate demand, does not detect collision；Multiple terminals can be led to execute the uplink of (3rd) step.Base station carries out school to data message
Test, so far just can be truly realized completely competition conflict arbitration.
Uncontested Stochastic accessing is another kind of form, and difference is that, before step (1), base station is from non-competing label
Targeting sequencing is specified for terminal, this predistribution mode is only applicable to switch, the synchronization before downlink data transmission in name set
Etc. situation, the data transfer actively initiated for terminal is invalid.
Internet of Things Network Communication is usually directed to substantial amounts of terminal, under the group case connecting same application server, more has
Transmit while great amount of terminals.Terminal almost simultaneous transmission number taking bridge monitoring as a example, when train passes through, with sensor
According to, similar scene also includes the fishery data monitoring under extreme weather, burglar force an entry into a building after safety and protection monitoring etc..In a large number eventually
While end, data transfer needs competitive channel to realize, and random access resource distribution is excessive, does not make full use of and then wastes money
Source；Distribution is very few, and the leading symbol transmission between terminal can produce collision, and failed transmission also leads to the waste of resource；One can
The method of row is to elongate the competition time of terminal, in the several seconds within the time of tens of seconds, allows terminal to go to compete, but the reality of business
When property can be affected again.
Content of the invention
Goal of the invention：It is an object of the invention to provide a kind of can solve the problem that defect present in prior art based on D2D
The random access resource distributing method of communication subgroup.
Technical scheme：The random access resource distributing method of the subgroup that communicated based on D2D of the present invention, is walked including following
Suddenly：
S1：The MTC device of executable D2D communication is divided into multiple subgroups：A main MTC device is specified in each subgroup,
Remaining is from MTC device；
S2：Base station is communicated with main MTC device in the way of poll, and ascending resource is distributed to each main MTC device；
S3：From MTC device in subgroup internal competition ascending resource, main MTC device is secondary to carrying out from the competition of MTC device
Cut out, and arbitration result is reported base station；
S4：The distribution carrying out random access resource from MTC device that base station is specified to arbitration result.
Further, described step S3 includes following sub-step：
S3.1：Leading symbol sequence is sent on the random access resource of specified D2D transmission time slot to master from MTC device
MTC device；
S3.2：After main MTC device detects leading symbol sequence, unique identification information is informed from MTC device；
S3.3：Send to main MTC device from MTC device and be easy to main MTC device and be at war with the reference data of arbitration；
S3.4：Main MTC device is at war with arbitration；
S3.5：Main MTC device, on the pre-assigned polling resources in base station, reports the race condition in current subgroup.
Further, the reference data in described step S3.3 includes the data showing to compete priority.
Further, in described step S3.5, main MTC device also will specify the mark letter from MTC device in arbitration result
The data is activation of breath and competition priority is to base station.
Further, the identification information in described step S3.2 includes numbering in subgroup numbering and group.
Further, in described step S4, what base station was specified to arbitration result should from MTC device distribution leading symbol sequence pair
Uncompetitive signature.
Further, in described step S1, the division principle of subgroup is：
(1) all MTC device being associated with single application server are divided into a subgroup；
(2) each MTC device is informed by competing priority in base station, is easy to MTC device all in this cell are divided
Subgroup.
Further, the main MTC device in described step S1 is according to signal incoming level and quality and current battery charge
To choose.
Further, if the collision probability of main MTC device detection is higher than threshold value, can select under the assistance of base station
Other main MTC device, one sub- group is split into multiple subgroups.
Beneficial effect：Compared with prior art, the present invention has following beneficial effect：
1) subgroup dividing mode so that subgroup in participate in competition equipment be greatly reduced so that colliding minimizing, invalid biography
Defeated decline means that spectrum efficiency gets a promotion；
2) D2D transmission be the short-range transmission of small-power, between multiple subgroups can using identical running time-frequency resource come with
Machine access contention, the form of this multiplexing can improve spectrum efficiency；
3) from whole meaning, terminal can quickly obtain uplink resource and carry out data transmission, thus improving
Real-time under Internet of Things application；
4) distinguishable go out the application of each Internet of Things priority level, and report to base station through main MTC device, so that base station exists
In follow-up scheduling, resource priority is distributed to more urgent equipment；
5) the maintenance and management process of subgroup is relatively simple, convenient to carry out；
6) because the communication between sub- group member is only the interim interaction numbered and compete these parameters of priority, no
It is related to the factor of any data privacy, impact thus without to the safety of communication system.
Brief description
Fig. 1 is the random access procedure schematic diagram based on competition of the prior art；
Fig. 2 is the schematic diagram of step S3 in the specific embodiment of the invention and S4.
Specific embodiment
With reference to the accompanying drawings and detailed description, technical scheme is further introduced.
For data transfer while a large amount of MTC terminal, the service quality of user should be considered, such as the time delay of transmission because
Element, the efficiency that resource uses from the point of view of operator again.For this reason, can using terminal direct connection (Device to Device,
Abbreviation D2D) communication and divide the form of subgroup designing.
D2D communication refers to when the distance between terminal is sufficiently small, can be by the way of " direct " or " local routing "
Communication, it is to avoid by infrastructure network, i.e. the alternate path of the node of base station and some core net, thus save link
Resource, also avoids wasting the disposal ability of node on link simultaneously.Have been defined for D2D in the 12nd version (Rel-12) of LTE
Basic framework, be wherein in communication with each other using uplink channel between terminal.
This specific embodiment disclose a kind of based on D2D communicate subgroup random access resource distributing method, including with
Lower step：
S1：The MTC device of executable D2D communication is divided into multiple subgroups：A main MTC device is specified in each subgroup,
Remaining is from MTC device；
S2：Base station is communicated with main MTC device in the way of poll, and ascending resource is distributed to each main MTC device；
S3：From MTC device in subgroup internal competition ascending resource, main MTC device is secondary to carrying out from the competition of MTC device
Cut out, and arbitration result is reported base station；
S4：The distribution carrying out random access resource from MTC device that base station is specified to arbitration result：According to each main MTC
The information that equipment reports, to arrange the suitable information transfer from MTC device in conjunction with urgency, notify on the uplink from
MTC device, and distribute the corresponding uncompetitive signature of leading symbol sequence for it, as shown in Figure 2.Subsequently from MTC device execution
Uncompetitive Stochastic accessing, and then obtain the data transfer of up-link.
Because D2D is the short-range communication mode of small-power, within the coverage of same base station, exist multiple this
The subgroup of sample, the MTC device number so participating in competing within subgroup is greatly reduced, and the probability of collision can substantially reduce；And
Same running time-frequency resource can be multiplexed, the utilization rate of resource also synchronously improves between subgroup.
Wherein, as shown in Fig. 2 step S3 includes following sub-step：
S3.1：Leading symbol sequence is sent on the random access resource of specified D2D transmission time slot to master from MTC device
MTC device；
S3.2：After main MTC device detects leading symbol sequence, unique identification information is informed from MTC device；Mark
Numbering in packet enclosed tool group # and group；
S3.3：Send to main MTC device from MTC device and be easy to main MTC device and be at war with the reference data of arbitration；Reference
Data includes the data showing to compete priority；
S3.4：Main MTC device is at war with arbitration, by competition arbitration it can be found that undetected in abovementioned steps touch
Hit；
S3.5：Main MTC device, on the pre-assigned polling resources in base station, reports the race condition in current subgroup, and
Enclose the identification information from MTC device specified in arbitration result and the data of competition priority.
In step S1, the division principle of subgroup is：
(1) all MTC device being associated with single application server are divided into a subgroup；
(2) each MTC device is informed by competing priority in base station, is easy to MTC device all in this cell are divided
Subgroup.This is that such as fault alarm is more harsh than daily checking meter has because the requirement of real-time of every kind of application is different
Delay requirement.
The selection of the main MTC device in step S1 is very crucial because this equipment to serve in subgroup other from
MTC device, select bad may be to causing stronger interference between subgroup, thus reducing spectrum efficiency.Generally,
Chosen according to signal incoming level and quality and current battery charge.Stand in the angle of operator, this main MTC device generation
The method of reason can avoid the competition of a large amount of MTC device Stochastic accessing to collide, and the congestion problems of effectively solving wireless access network carry
Spectral efficient and acquisition economic benefit；It is contemplated that incentive measure is encouraging this behavior.
After main MTC device is chosen, add suitable subgroup from MTC, obtain related configuration information, such as subgroup is joined
Put transmission intercal and the time slot of D2D communication, resource that RACH is used etc..When information changes, each from
MTC device need to upgrade in time.
If the collision probability of main MTC device detection is higher than threshold value, others can be selected under the assistance of base station
Main MTC device, one sub- group is split into multiple subgroups, so can reduce the quantity of equipment within single subgroup.If more
Change new main MTC device, then each need to add new subgroup from MTC device.
The only interim numbering being interacted with from MTC device due to main MTC device and competition these parameters of priority, are not related to
And the factor of any data privacy, impact thus without to the safety of communication system.
Claims (9)
1. based on D2D communicate subgroup random access resource distributing method it is characterised in that：Comprise the following steps：
S1：The MTC device of executable D2D communication is divided into multiple subgroups：A main MTC device is specified in each subgroup, remaining
Be from MTC device；
S2：Base station is communicated with main MTC device in the way of poll, and ascending resource is distributed to each main MTC device；
S3：From MTC device in subgroup internal competition ascending resource, main MTC device is arbitrated to from the competition of MTC device, and
Arbitration result is reported base station；
S4：The distribution carrying out random access resource from MTC device that base station is specified to arbitration result.
2. according to claim 1 based on D2D communicate subgroup random access resource distributing method it is characterised in that：Institute
State step S3 and include following sub-step：
S3.1：Leading symbol sequence is sent on the random access resource of specified D2D transmission time slot to main MTC from MTC device
Equipment；
S3.2：After main MTC device detects leading symbol sequence, unique identification information is informed from MTC device；
S3.3：Send to main MTC device from MTC device and be easy to main MTC device and be at war with the reference data of arbitration；
S3.4：Main MTC device is at war with arbitration；
S3.5：Main MTC device, on the pre-assigned polling resources in base station, reports the race condition in current subgroup.
3. according to claim 2 based on D2D communicate subgroup random access resource distributing method it is characterised in that：Institute
State the data that the reference data in step S3.3 includes showing to compete priority.
4. according to claim 3 based on D2D communicate subgroup random access resource distributing method it is characterised in that：Institute
State in step S3.5, main MTC device also will specify identification information and the number competing priority from MTC device in arbitration result
According to being sent to base station.
5. according to claim 2 based on D2D communicate subgroup random access resource distributing method it is characterised in that：Institute
State the identification information in step S3.2 and include numbering in subgroup numbering and group.
6. according to claim 1 based on D2D communicate subgroup random access resource distributing method it is characterised in that：Institute
State in step S4, what base station was specified to arbitration result distributes the corresponding uncompetitive signature of leading symbol sequence from MTC device.
7. according to claim 1 based on D2D communicate subgroup random access resource distributing method it is characterised in that：Institute
The division principle stating subgroup in step S1 is：
(1) all MTC device being associated with single application server are divided into a subgroup；
(2) each MTC device is informed by competing priority in base station, is easy to MTC device all in this cell be carried out divide subgroup.
8. according to claim 1 based on D2D communicate subgroup random access resource distributing method it is characterised in that：Institute
The main MTC device stated in step S1 is chosen according to signal incoming level and quality and current battery charge.
9. according to claim 1 based on D2D communicate subgroup random access resource distributing method it is characterised in that：As
The collision probability of really main MTC device detection is higher than threshold value, then can select other main MTC device under the assistance of base station,
One sub- group is split into multiple subgroups.
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Application publication date: 20170222 |