CN107295567A - A kind of unlimited resources collision detection method based on frame structure - Google Patents
A kind of unlimited resources collision detection method based on frame structure Download PDFInfo
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- CN107295567A CN107295567A CN201710602481.7A CN201710602481A CN107295567A CN 107295567 A CN107295567 A CN 107295567A CN 201710602481 A CN201710602481 A CN 201710602481A CN 107295567 A CN107295567 A CN 107295567A
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- 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
- H04W28/0294—Traffic management, e.g. flow control or congestion control forcing collision
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W74/00—Wireless channel access, e.g. scheduled or random access
- H04W74/08—Non-scheduled or contention based access, e.g. random access, ALOHA, CSMA [Carrier Sense Multiple Access]
- H04W74/0808—Non-scheduled or contention based access, e.g. random access, ALOHA, CSMA [Carrier Sense Multiple Access] using carrier sensing, e.g. as in CSMA
- H04W74/0825—Non-scheduled or contention based access, e.g. random access, ALOHA, CSMA [Carrier Sense Multiple Access] using carrier sensing, e.g. as in CSMA carrier sensing with collision detection
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W74/00—Wireless channel access, e.g. scheduled or random access
- H04W74/08—Non-scheduled or contention based access, e.g. random access, ALOHA, CSMA [Carrier Sense Multiple Access]
- H04W74/0833—Non-scheduled or contention based access, e.g. random access, ALOHA, CSMA [Carrier Sense Multiple Access] using a random access procedure
- H04W74/0841—Non-scheduled or contention based access, e.g. random access, ALOHA, CSMA [Carrier Sense Multiple Access] using a random access procedure with collision treatment
- H04W74/085—Non-scheduled or contention based access, e.g. random access, ALOHA, CSMA [Carrier Sense Multiple Access] using a random access procedure with collision treatment collision avoidance
Abstract
The present invention relates to a kind of unlimited resources collision detection method based on frame structure, belong to wireless communication field.This method comprises the following steps：S1：Radio frames are divided into collision detection area and data transmission range；S2：The collision detection code division that collision detection time slot is carried into high priority collision detection code and low priority collision detection code；Collision detection code is sent on collision detection time slot；S3：Equipment detects collision detection codes all in collision detection time slot, by detecting the conflict order of severity that the quantity evaluation data transmission range of collision detection code is present, and with the back off time of this determination equipment；If not finding that other equipment sends collision detection code, equipment uses the Radio Resource in data transfer area.The transfer resource competition that the present invention solves under the conditions of frame synchronization uses problem；In addition, collision detection code divide into different priority, scene of the different priorities competition using transfer resource is adapted to.
Description
Technical field
The invention belongs to wireless communication field, it is related to a kind of unlimited resources collision detection method based on frame structure.
Background technology
Using distributed control method, each node of bus is attached by way of competition, the right to use of bus is obtained.
Only obtaining the node of the right to use just can be to bus sending information frame, and the information frame is by all node senses of attached bus
Know.Including three below main points：First：Carrier sense, sends node before information frame is sent, it is necessary to intercept whether media are located
In idle condition；Second：Multiple access, with two kinds of implications, had both represented that multiple nodes can also illustrate that one while access media
The information frame that individual node is sent can be received by multiple nodes；3rd：Collision detection, sends node and is sending the same of information frame
When, it is necessary to media are monitored, judge whether to clash (synchronization whether there is other nodes and also sending information frame).At present
There is two ways available, csma/collision detection mechanism is (referred to as：CSMA/CD, Carrier Sense
Multiple Access/Collision Detect) and Carrier Sense Multiple access/avoid collision (referred to as：CSMA/CA) side
Formula.
CSMA/CD modes, i.e. csma/collision detection mechanism.When multiple networks on wired ethernet
Equipment is needed the conflict simultaneously when carrying out data transmission, occurred using this agreement with regard to that can detect on network and carries out corresponding position
Reason.Its operation principle can be summarized as listem-before-talk, be said when listening；Once conflict, stops immediately；Await a favorable opportunity, then say again.
But it is not appropriate for WLAN, in a wireless local area network, radio wave transmissions distance is limited, and not all node is all
Signal can be listened to；Moreover because wireless network card work is in a half-duplex mode, equipment can not receive data-signal
While transmit data-signal.On the other hand, wireless bandwidth is not originally high, once colliding, data will be resend, and be gulped down
Therefore the amount of telling can also reduce.
CSMA/CD has carried out some modifications, employs new agreement CSMA/CA, CSMA/CA operation principle as follows：
(1) whether detection channel first is by website (abbreviation：STA) use, if detecting channel idle, wait distribution
Coordination function interframe space is (referred to as：DIFS) after the time, data are sent out.
(2) if purpose STA is properly received this frame, by short interFrameGap (referred to as：SIFS) after the time, to source STA
Send acknowledgement frame ACK.
(3) source STA receives ACK frames, determines that data transfer is correct, after experience DIFS time intervals, it may appear that one section of sky
Between idle, it is called contention window, shows that the situation of each STA contention channels occurs.
If finding that channel is occupied when detecting channel, STA can use the back off algorithm of CSMA/CA agreements, freeze to keep out of the way
Timer.As long as channel idle, back-off timer just carries out countdown.When back-off timer is reduced to zero, STA just sends number
According to frame and wait to be confirmed.If not receiving ACK frames after sending data frame, this frame must be retransmitted.
Have a problem that, can be sent out when multiple site requests send data in current CSMA/CD or CSMA/CA
Raw conflict, because not knowing the order of severity of conflict, all websites can only be kept out of the way according to identical mechanism, participate in again
The conflict competition of next round.There is open defect in actual deployment application in this mode：
First：It can be clashed when multiple websites are asked simultaneously and send data, but each website only knows there is it
He also sends data by website in request, does not know that how many specific website is sent in request but, so can not be to the serious of conflict
Degree is estimated.
Second：When website sends data generation conflict, it is impossible to objective evaluation conflict spectrum, so having no idea to provide
Rational back off time, can only randomly choose a back off time within a time.
3rd：There are different priority in the transmission data of website, but had no idea according to current implementation to improve high
Priority sends the probability of data.Namely in actual applications, such as signaling can be set as high priority, and in conflict
There is preferential transmission right in competition.
So there is certain defect in actual use in current CSMA/CD or CSMA/CA.
The content of the invention
In view of this, it is an object of the invention to provide a kind of side of the competition in wireless communication system using Radio Resource
Formula, its principle is that Radio Resource is managed and used using radio frames mode, and radio frames are divided into collision detection area first
With data transmission range, a collision detection area and a data transmission range constitute a transmission unit.Collision detection area is used to assist
Adjust multiple equipment competition using data transfer area, be made up of multiple collision detection time slots.Data transfer area is used for equipment and transmits height
The data of priority or low priority, data transfer area can be made up of multiple data transmission frames.
To reach above-mentioned purpose, the present invention provides following technical scheme：
A kind of unlimited resources collision detection method based on frame structure, this method comprises the following steps：
S1：Radio frames are divided into collision detection area and data transmission range, a collision detection area and a data transmission range
Constitute a transmission unit；Collision detection area is made up of multiple collision detection time slots, and number is used for coordinating multiple equipment competition
According to transmission range, data transfer area is made up of multiple data transmission frames, and the number of high priority or low priority is transmitted for equipment
According to；
S2：The collision detection code division that collision detection time slot is carried into high priority collision detection code and low priority conflict
Detection code；One is randomly choosed from high priority collision detection code if equipment sends high-priority data, if equipment
Send lower-priority data and then randomly choose one from low priority collision detection code；By collision detection code in collision detection
Sent in gap；
S3：Equipment detects collision detection codes all in collision detection time slot, by the quantity for detecting collision detection code
The conflict order of severity that data transfer area is present is assessed, and with the back off time of this determination equipment；If not finding that other set
Preparation send collision detection code, then equipment uses the Radio Resource in data transfer area.
Further, in the step S3：
If equipment does not find the collision detection code that other equipment is sent, it is determined that this equipment possesses making for data transfer area
Use authority；
If equipment is found that the collision detection code that other equipment is sent, and all collision detection code priority is all low
In this equipment collision detection code priority, then the equipment possess the right to use in data transfer area；
If the priority for the collision detection code that equipment discovery other equipment is sent is identical with this equipment or than this equipment
Height, then one rational back off time of selection, again participation transmission unit are the competition of Radio Resource by the equipment.
Further, in the step S3：
Equipment, which detects high priority collision detection code, has t individual, wherein t >=0, low priority collision detection code s, wherein
s≥0；When equipment detects t+s ≠ 0；If equipment sends high-priority data, equipment is in follow-up 0~t of transmission unit
One transmission unit competition of random selection uses Radio Resource；If equipment sends lower-priority data, equipment is follow-up
The competition that a transmission unit participates in Radio Resource is randomly choosed in transmission unit t~t+s；
Further describe, in conflict scene, equipment selection is numbered since 0 using follow-up transmission unit, is kept out of the way for 0
Transmission unit be conflict this transmission unit；
Equipment waits the transmission unit time randomly choosed out to arrive, and when the transmission unit time reaches, equipment is reselected
Collision detection code, participates in process of the competition using data transfer area again.
The beneficial effects of the present invention are：
(1) the transfer resource competition that the present invention is solved under the conditions of frame synchronization uses problem.In existing frame synchronization side
Under formula, transfer resource carries out unified distribution and used, in the absence of competition usage scenario, with the increase of business and scene, though
There is identical frame synchronization between right distinct device, but transfer resource scene is used there is also competition.
(2) present invention obtains the serious journey of conflict when equipment detects conflict using the mode of orthogonal collision detection code
Degree, it is determined that competition uses the number of devices of identical transfer resource.
(3) collision detection code divide into different priority by the present invention, can adapt to different priorities competition and uses biography
The scene of defeated resource.
Brief description of the drawings
In order that the purpose of the present invention, technical scheme and beneficial effect are clearer, the present invention provides drawings described below and carried out
Explanation：
Fig. 1 is the Radio Resource collision detection schematic diagram based on frame structure；
Fig. 2 is the Radio Resource coordination process figure based on frame structure；
Fig. 3 is the avoidance mechanism being wirelessly transferred in conflict；
Fig. 4 is the Conflicts management strategy under routine CP patterns；
Fig. 5 is the Conflicts management strategy under extension CP patterns；
Fig. 6 is the Conflicts management strategy under LTE frame patterns；
Fig. 7 is the conflict avoidance mechanism under LTE frame patterns；
Fig. 8 is that cell and mobile terminal competition use multiple transmission unit schematic diagram of a scenario；
Fig. 9 is the multichannel conflict avoidance mechanism under LTE frame patterns.
Embodiment
Below in conjunction with accompanying drawing, the preferred embodiments of the present invention are described in detail.
As shown in figure 1, the present invention is managed and used to Radio Resource using radio frames mode, first by radio frames point
Into collision detection area and data transmission range, a collision detection area and a data transmission range constitute a transmission unit.Conflict
Detection zone is used to coordinate multiple equipment competition using data transfer area, is made up of multiple collision detection time slots.Use in data transfer area
The data of high priority or low priority are transmitted in equipment, data transfer area can be made up of multiple data transmission frames.
Collision detection time slot in each collision detection area may carry multiple collision detection codes with property of orthogonality, punching
Prominent detection code is divided into two groups, high priority collision detection code and low priority collision detection code, if equipment sends high priority
Data then randomly choose one from high priority collision detection code, if lower-priority data, then from low priority conflict
One is randomly choosed in detection code, and collision detection code is sent on collision detection time slot.
Equipment detects collision detection codes all in collision detection time slot first when collision detection is carried out, and
And by detecting the conflict order of severity that the quantity evaluation data transmission range of collision detection code is present, and moving back with this determination equipment
Keep away the time.If not finding that other equipment sends collision detection code, equipment can use the Radio Resource in data transfer area.
The Radio Resource coordination process based on frame structure that the present invention is provided is detailed below, as shown in Figure 2.
Step 1：There is orthogonality between each code word for all collision detection code that equipment is used, all devices use phase
With method by collision detection code division into two groups, i.e. high priority and low priority collision detection code.Such as 1 step in Fig. 2.
Step 2：If what device request was sent is high-priority data, then random from high priority collision detection code
A code is selected, if lower-priority data, then randomly choose a code from low priority collision detection code, and rear
Sent on continuous collision detection time slot.Such as 2,3,4,5 steps in Fig. 2.
Step 3：Equipment is randomly choosed after a collision detection time slot in follow-up collision detection time slot, and this equipment stops
Collision detection code is sent on the collision detection time slot, and detects the conflict that other equipment is sent on collision detection time slot
Detection code.Such as 6 steps in Fig. 2.
Step 4：If in step 3, equipment does not find the collision detection code that other equipment is sent, it is determined that this equipment is gathered around
There is the access right in data transfer area.Such as 7,8 steps in Fig. 2.
Step 5：If in step 3, equipment is found that the collision detection code that other equipment is sent, and all conflicts
Detection code priority is below the collision detection code priority of this equipment, then the equipment possesses the right to use in data transfer area.
Step 6：If in step 3, equipment find the priority of other equipment collision detection code it is identical with this equipment or
It is higher than this equipment, then equipment will select a rational back off time, the competition that transmission unit is Radio Resource is participated in again.
Such as 9,10,11 steps in Fig. 2.
Be detailed below the present invention provide the Radio Resource conflict coordination based on frame structure when backoff procedure, such as scheme
Shown in 3.
Step 1：Equipment randomly chooses a collision detection time slot in upcoming collision detection area, i.e., in such as Fig. 1
In 1~M of collision detection area in randomly choose a collision detection time slot.Such as 1 step in Fig. 3.
Step 2：Equipment will detect that all collision detection codes in randomly selected collision detection time slot, it is assumed that equipment is examined
Measuring high priority collision detection code has t (t is more than or equal to 0), and (s is more than or equal to low priority collision detection code s
0).If equipment does not find high priority collision detection code and low priority collision detection code, this equipment possesses to be passed in data
The access right of Radio Resource in defeated area.Such as 2,3,4,5 steps in Fig. 3.
Step 3：If in second step, equipment detection t+s is not equal to 0, and if equipment sends high priority number
According to then equipment randomly chooses a transmission unit competition in follow-up 0~t of transmission unit and uses Radio Resource, wherein at random
The follow-up transmission unit of selection is 0, then it represents that select this conflict transmission unit to carry out data transmission.If equipment sends low excellent
First DBMS, then equipment transmission unit is randomly choosed in follow-up transmission unit t~t+s and participates in the competing of Radio Resource
Strive.Such as 6,7,8 steps in Fig. 3.
Step 4：Equipment waits the transmission unit time randomly choosed out to arrive.When reaching the transmission unit time, equipment
Collision detection code is reselected, process of the competition using data transfer area is participated in again.Such as 9 steps in Fig. 3.
Two application scenarios are illustrated below, are scene of the LTE cells competition using Radio Resource first,
Next to that LTE mobile terminal carries out the scene of direct communication.
Specific embodiment 1：
In the application deployment of following LTE cells, plug and play is the direction of a development, can be entered with similar Wi-Fi hotspot
Row deployment, but the plug-and-play feature of cell is for the planning of Radio Resource and using will bring very big impact, mainly
It is that, because having no idea to coordinate the use of Radio Resource in time between different cell, cell competition uses wireless
Resource will be inevitable.The invention provides a kind of method for solving this conflict.
In order to clearly demonstrate the details of use of the present invention, it will hereafter be illustrated from two angles, and be multiple LTE first
The method that terminal challenge uses same transmission unit, followed by the competition of multiple LTE terminals uses the method for multiple transmission units.
, it is necessary to compete using same transmission unit before multiple cells and LTE terminal carry out data transmission, in description tool
Basic conception is first introduced before body mode of operation：
First：Time interval resource is divided：Continue to continue to use current LTE frame structures, if normal CP patterns, then a son
Frame divide into 14 OFDMs (referred to as：OFDM) symbol, wherein preceding 7 OFDM symbols are used for collision detection area, each
Symbol definition is a collision detection time slot, as shown in Figure 4.If extension CP patterns, then a subframe has 12 OFDM symbols
Number, wherein preceding 3 OFDM symbols are set to collision detection area, as shown in Figure 5.Actual in use, collision detection number of time slot
(being OFDM numbers in this embodiment), can be different according to different system.For convenience of explanation, in the examples of implementation,
Normal CP patterns will be used, that is, there are 7 collision detection time slots (7 OFDM times) to illustrate the specific implementation of the invention.
Second：The definition of transmission unit：According to the requirement of the present invention, transmission unit is by collision detection area and data transmission range
Constitute, in this embodiment it is assumed that data transfer area is constituted by sending data field 1 and sending data field 2, sending data field can
To be 1 or multiple subframe Radio Resources.For convenience of explanation, data field 2 is sent to be made up of the subframe of two 1ms length.
3rd：Transmit data priority：The data sent in data transfer area are divided into two types, signaling data and business
Data.Wherein signaling data is defined as the high-priority data in the present invention, and business datum is defined as low preferential in the present invention
DBMS.
4th：Collision detection code：In the present embodiment, collision detection code uses ZC different in ZC sequences, ZC sequences
It is mutually orthogonal between sequence code.
Lower mask body introduces the data transfer between cell and mobile terminal, mainly introduces and coordinates to conflict and using biography
The operating process of defeated resource.It is specific as shown in Figure 6.
Step 1：On small-cell base station after electricity, neighbouring macro base station is searched for first, if not receiving macro base station,
Small-cell base station nearby is continued search for, the purpose of the process is to ensure that cells all in a region all keep synchronous shape
State, that is, it is synchronous with frequency and frame timing.Such as 1 step in Fig. 6.
Step 2：When small-cell base station sends downlink data to mobile terminal, or cell receives mobile terminal and asked
Ask need send upstream data when, i.e., between cell and mobile terminal data transfer need take Radio Resource.Such as Fig. 6
In 2,3 steps.
Step 3：Small-cell base station determines the data type for needing to send first, if signaling data, is then defined as height
Priority data, if business datum, is then defined as lower-priority data.If high-priority data, then randomly choose
The orthogonal collision detection code of one high priority, if lower-priority data, then one low priority of random selection is orthogonal
Collision detection code.Such as 4,5,6 steps in Fig. 6.
Step 4：Cell will wait next transmission unit time to arrive, and specific calculation is SFN%T_
Schedule=T_Offset, wherein SFN represent that all cells all keep identical System Frame Number (unit is radio frames),
T_Schedule represents the length of transmission unit, that is, represents how many radio frames.T_Offset represents offset.T_Schedule
With T_Offset to preset, all cells all use identical parameter, the T_Schedule=in the examples of implementation
3, T_Offset=0.Such as 7 steps in Fig. 6.
Step 5：Cell can be sent when a transmission unit arrives on the collision detection time slot of transmission unit
Orthogonal collision detection code, except the collision detection time slot for oneself needing to detect, in the remaining each collision detection of transmission unit
Gap is required for sending.Such as 8 steps in Fig. 6.
Step 6：Cell randomly chooses a collision detection time slot in all collision detection time slots of transmission unit.Inspection
Survey needs to send data with the presence or absence of other cells, if there is orthogonal collision detection code, indicates that other cells also exist
Request uses the transmission unit, otherwise represents to use the transmission unit without other small cell requests.Such as 9 steps in Fig. 6.
Step 7：If cell detects orthogonal collision detection code in collision detection time slot, cell will start this
Conflict avoidance mechanism in invention, otherwise represents that the transmission unit can be used to carry out data biography between cell and mobile terminal
It is defeated.Such as 10 steps in Fig. 6.
Lower mask body introduces avoidance mechanism when LTE terminal request is conflicted using transfer resource.It is specific as shown in Figure 7.
Step 1：Cell randomly chooses a collision detection time slot, stops sending originally small in this collision detection time slot
The orthogonal collision detection code of cell.Such as 1 step in Fig. 7.
Step 2：Cell receives the data on selected collision detection time slot, and detects all orthogonal collision detection
Code.It is assumed that detecting the orthogonal collision detection code of high priority has t, the orthogonal collision detection code of low priority has s.As schemed
2 step in 7.
Step 3：Detecting orthogonal collision detection code has t+s, if t+s=0, shows without the competition of other cells
Using the transmission unit, this cell can use the data transfer area resource on transmission unit.Such as 3,4 steps in Fig. 7.
Step 4：If t+s is not equal to 0, show other cells also in data transfer of the competition using the transmission unit
Area resource, if what is sent between cell and mobile terminal is signaling data, cell (can be represented in 1 and t in [1, t]
Between, including 1 and t) one transmission unit of random selection in individual transmission unit, and when participating in conflict again on the transmission unit
The competition of transfer resource.If what is sent between cell and mobile terminal is business datum, cell is in [(t+1), (t+
S)] (represent between t+1 and t+s, including t+1 and t+s) to randomly choose a transmission unit in individual transmission unit, in the biography
The competition of transfer resource during conflict is participated on defeated unit again.
Such as 5,6,7 steps in Fig. 7.
Step 5：At random after selected transmission unit, cell reselects corresponding orthogonal collision detection code, waits to be selected
Fixed transmission unit is arrived, and the collision detection of transmission unit is then participated in again to complete the process of competition transfer resource.Such as Fig. 7
In 8,9 steps.
The scene that competition between multiple cells and terminal uses a transmission unit is presented above, in actual application
In, cell and mobile terminal can compete the transmission unit provided using different frequent points.Lower mask body introduction uses the present invention
Solve the method for multiple cells and mobile terminal competition using multiple transmission units.
Multiple cells and mobile terminal competition use multiple transmission unit scenes, specific as shown in Figure 8.It is assumed that cell
K transmission unit can be used between mobile terminal.Separate between each channel, the transmission unit of each channel is also
Since SFN%T_Schedule=T_Offset positions, each transmission unit has the collision detection area of oneself and data to send
Area.
Lower mask body introduces multiple cells and LTE terminal using many set transmission resource request data transfers and when conflicting
Handling process.It is specific as shown in Figure 9.
Step 1：Cell determines the transfer resource that can be used in the region first, that is, determines available transmission channel,
It is assumed that there is the transmission channel of K bar independences.Such as 1 step in Fig. 9.
Step 2：The cell for needing to send or receiving data randomly chooses a channel into k from channel number 1, false
Fixed randomly selected channel number is z, and wherein z belongs to 1 to integer between k (can include 1 and k).Such as 2 steps in Fig. 9.Cell
Competition uses the transmission unit on channel k first.
Step 3：Cell uses the mode of transfer resource according to multiple cells and mobile terminal conflict, and competition uses letter
Transmission unit resource on road k.Such as 3 steps in Fig. 9.
Specific embodiment 2：
In order to more preferably illustrate that the present invention can be used in practice, it will hereafter proceed to put to the proof.Without the covering of any base station
Environment in need to be in communication with each other between LTE terminal, particularly in emergent or disaster relief scene, because LTE base station can not make
With so supporting that the communication between LTE terminal is very necessary.Due in the same area, it is understood that there may be much to LTE terminal all
Need to be in communication with each other, but progress Radio Resource of being had no idea between them is coordinated using, it is necessary to using conflict competition side
Formula.The scene is device-to-device (abbreviation：D2D) scene, so the competition that the present invention can also be applied to D2D transfer resources makes
During.
In LTE system D2D, there are two kinds using the mode of Radio Resource, a kind of is to determine D2D terminals by base station scheduling
Radio Resource, that is, base station scheduling D2D terminals send the running time-frequency resource used.Another mode is by one group of network configuration
Radio Resource or by terminal give tacit consent to one group of Radio Resource, then D2D terminals randomly choose one group of Radio Resource use.Second
In the situation of kind, due to there is no base station to carry out Radio Resource coordination between D2D terminals, used wirelessly so there is D2D terminal challenges
The situation of resource.Under D2D terminal direct connection scenes, because wireless when can solve no base station scheduling well using patent of the present invention
The conflict that resource is produced.
With reference to the description in specific embodiments above 1, the specific method for solving the communication of D2D terminal direct connections is as follows.
Step 1：Electricity on D2D starting up of terminal, first search base station signal, if not searching base station signal, are searched for
The synchronizing signal that neighbouring D2D terminals are sent, it is ensured that D2D terminal references identical LTE wireless timeslots and identical in communication
System Frame Number.
Step 2：According to the definition of current 3GPP standards, the Radio Resource that D2D terminal direct connections are used is wide from system message
Broadcast, connection mode is configured and terminal default configuration.Wherein system message broadcast and connection mode configuration, it is necessary to be that terminal is in
In base station signal coverage, then network can allow D2D terminals oneself random selection for sending request to make with allocation radio resource
With.If D2D is in without base station coverage area, the Radio Resource that D2D terminals can only randomly choose acquiescence is used.
Step 3：If D2D terminals need to send signaling data, D2D terminals are from the orthogonal collision detection code of high priority
Random selection one, if D2D terminals send business datum, D2D terminals are random from the orthogonal collision detection code of low priority
Selection one.
Step 4：D2D terminals randomly choose one group in Radio Resource group and used.And according to SFN%T_Schedule=
T_Offset come determine carry out collision detection transmission unit.
Step 5：D2D terminals send selected orthogonal punching on the collision detection time slot in the collision detection area of transmission unit
Prominent detection code, and when a randomly selected collision detection time slot arrives, D2D stops sending the collision detection code of oneself,
Detect whether other D2D terminals have sent collision detection code simultaneously.
Step 6：If D2D terminals detect the collision detection code of other D2D terminals transmission on collision detection time slot,
The avoidance mechanism that D2D terminals are enabled in patent of the present invention is handled.
Step 7：If D2D terminals are not detected by the collision detection code of other D2D terminals transmission on collision detection time slot,
Then the D2D terminals possess the authority that data are sent on transmission unit.
Finally illustrate, preferred embodiment above is merely illustrative of the technical solution of the present invention and unrestricted, although logical
Cross above preferred embodiment the present invention is described in detail, it is to be understood by those skilled in the art that can be
Various changes are made to it in form and in details, without departing from claims of the present invention limited range.
Claims (3)
1. a kind of unlimited resources collision detection method based on frame structure, it is characterised in that：This method comprises the following steps：
S1：Radio frames are divided into collision detection area and data transmission range, a collision detection area and a data transmission range are constituted
One transmission unit；Collision detection area is made up of multiple collision detection time slots, is passed for coordinating multiple equipment competition using data
Defeated area, data transfer area is made up of multiple data transmission frames, and the data of high priority or low priority are transmitted for equipment；
S2：The collision detection code division that collision detection time slot is carried into high priority collision detection code and low priority collision detection
Code；One is randomly choosed from high priority collision detection code if equipment sends high-priority data, if equipment is sent
Lower-priority data then randomly chooses one from low priority collision detection code；By collision detection code on collision detection time slot
Send；
S3：Equipment detects collision detection codes all in collision detection time slot, by detecting that the quantity of collision detection code is assessed
The conflict order of severity that data transfer area is present, and with the back off time of this determination equipment；If not finding that other equipment is sent out
Collision detection code is sent, then equipment uses the Radio Resource in data transfer area.
2. a kind of unlimited resources collision detection method based on frame structure as claimed in claim 1, it is characterised in that：Described
In step S3：
If equipment does not find the collision detection code that other equipment is sent, it is determined that this equipment possesses the right to use in data transfer area
Limit；
If equipment is found that the collision detection code that other equipment is sent, and all collision detection code priority is below this
Equipment collision detection code priority, then the equipment possess the right to use in data transfer area；
If equipment finds that the priority for the collision detection code that other equipment is sent is identical with this equipment or higher than this equipment,
The equipment will select a rational back off time, and the competition that transmission unit is Radio Resource is participated in again.
3. a kind of unlimited resources collision detection method based on frame structure as claimed in claim 1, it is characterised in that：Described
In step S3：
Equipment, which detects high priority collision detection code, has t individual, wherein t >=0, low priority collision detection code s, and wherein s >=
0；When equipment detects t+s ≠ 0；If equipment send high-priority data, equipment in follow-up 0~t of transmission unit with
Machine selects a transmission unit competition to use Radio Resource；If equipment sends lower-priority data, equipment is in follow-up biography
The competition that a transmission unit participates in Radio Resource is randomly choosed in defeated unit t~t+s；
Further describe, in conflict scene, equipment selection is numbered since 0 using follow-up transmission unit, keeps out of the way the biography for 0
Defeated unit is this transmission unit of conflict；
Equipment waits the transmission unit time randomly choosed out to arrive, and when the transmission unit time reaches, equipment reselects conflict
Detection code, participates in process of the competition using data transfer area again.
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