CN103686983B - A kind of data send the method and device of advanced processing - Google Patents
A kind of data send the method and device of advanced processing Download PDFInfo
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Abstract
The invention discloses a kind of data and send the method and device of advanced processing.The method is: node can process maximum delay according to default MAC layer transmission and PHY layer module requires that MAC layer module sends amount pre-set time of MAC C PDU, determine that this locality proceeds by the latest time point sending Message Processing, and when being not later than this latest time point, proceed by transmission and process.So, each node can proceed by FI message according to periodicity timed message exactly at time slot beginning boundary and send, FI message is alignd with time slot beginning boundary in the real time starting point that sends eated dishes without rice or wine, effectively prevent the message caused because of time delay to be delayed, ensure the transmission performance of system.
Description
Technical field
The present invention relates to the communications field, send the method and device of advanced processing particularly to a kind of data.
Background technology
Along with development and the gradually maturation of mobile self-networking technology of Vehicular communication system, in order to realize the reality to vehicle
Time, dynamically, intelligent management, develop DSRC (the Dedicated Short Range for car networking the most specially
Communications, DSRC) agreement.The DSRC transmitted in both directions by information, by vehicle and vehicle, vehicle and road
The information collecting device of side organically couples together, and supports point-to-point, point-to-multipoint delivery.
Mobile time-division slot ALOHA (Mobile Slotted Aloha, MS-ALOHA) mechanism is a kind of based on time-sharing format
DSRC MAC (Medium Access Control；Medium education) layer access and resource allocation mechanism, resource distribution base
In frame structure with slot (time slot) as unit.Refering to shown in Fig. 1, every N number of slot constitutes a frame (being designated as Frame), each frame
In slot numbered 0～N-1, move in circles between frames.Each slot only allow a vehicle be transmitted, i.e. car
It it is TDMA (Time Division Multiple Access, time division multiplex accesses) pattern between.Vehicle is when shared
Not only send the data of application layer in gap, but also need to send FI (Frame Information, frame information), in FI
The seizure condition of each slot in a frame can be indicated.
In actual application, each node can select the use time slot of self when access system, and wherein, access procedure is divided into
5 steps: monitoring, select idle slot, wait and confirm that this slot is idle, send, monitor feedback, substantially flow process sees Fig. 1
Shown in.
Step 1: node monitors a frame.
Node monitors all slot in a frame, and information is inserted in N*N time slot state cache table as shown in Figure 3.
Particularly as follows:
If node have received FI on slot n (0≤n≤N-1), then the N number of field (territory) in this FI is inserted
In row corresponding for slot n in N*N time slot state cache table, (each field has 4 kinds of STATUS (state) values, idle condition
(00), seizure condition (10), conflict situation (01), double bounce seizure condition (11), Fig. 3 is expressed as XX)；If on slot n
When node does not receive any content, then N row " default state " is inserted slot n in N*N time slot state cache table corresponding
Row in；Wherein, any one unit have 5 kinds of possible states, 4 kinds of the most above-mentioned states and default state.
By the way, after a frame end, node obtains the time slot state information that N*N matrix form is safeguarded, and
Perform step 2.
Step 2: node selects a free timeslot (available slot).
For certain slot, only when this slot row in N*N time slot state cache table meet following condition, node is recognized
It is idle available (available): each element in row for this slot, or is idle condition (00), or be default
State.
If available free slot, node selects this slot；If idle slot is more than one, node selects one the most at random
Individual；Without idle slot, then the slot lower than self current priority is regarded as the free time and select by node.
After selecting idle slot, perform step 3.
Step 3: node waits that selected slot arrives, reaffirms the most idle.
Assuming in step 2, node have selected idle slot p (e.g., slot 4).So before slot p arrives, node is held
Continuous each slot of monitoring, the old slot information covered in upper table by new slot information (i.e. remains the most N number of in window
The information of slot).By the time the ending of slot p-1, utilizes N*N time slot state cache table, checks whether slot p still meets step
Condition (including the mode considered without priority during idle slot) in rapid 2: the most then perform step 4 and (send
Subframe), otherwise, step 2 is re-executed immediately.
Step 4: node sends subframe at slot p.
Now in the FI of subframe, node fills in each field in FI according to following rule:
(1) for current slot, fill in seizure condition (10), and fill in self STI and precedence information
(2) for other slot, row corresponding in (N-1) * N time slot state cache table are investigated；
1) if N-1 element in row corresponding to slot is all that idle condition (00), default state or double bounce take
State (11), then extend this as idle condition (00) (not filling in STI and precedence information) by this slot state,
2) if the detecting domains of slot is seizure condition (10), and in arranging, other N-1 element is all idle condition
(00), default state, double bounce seizure condition (11), or the seizure condition (10) identical with detecting domains STI, then by this slot
State extends this as seizure condition (10) (filling in STI and the precedence information of correspondence).
3) if in slot respective column in N-1 element, occur in that 2 and above seizure condition (10), and STI is not
With, then this slot state is extended this as conflict situation (01) and (fill in the STI that priority is the highest, when priority is identical, select at random
Fill in for one, fill in the highest priority).
4) if the detecting domains of slot is default state, and in arranging in remaining N-1 element, one or more
For seizure condition (10), and their STI is the most identical, then this slot state is extended this as double bounce seizure condition (11) and (fill in STI
And priority).
After being sent, empty row corresponding for slot p in N*N time slot state cache table.Perform step 5.
Step 5: node monitors feedback, is confirmed whether successfully.
From the beginning of slot p+1, node monitors N-1 slot, generates (N-1) * N time slot state cache table, at slot p+
The ending (the namely beginning of slot p+N) of N-1, it is judged that N-1 element of the row that slot p is corresponding:
If N-1 element is default state, idle condition (00), or be seizure condition (10) and STI and self
STI identical, then it is assumed that be successfully accessed；
If in N-1 element, occur in that seizure conditions (10) different from self STI for one or more STI, then judge
Priority:
If other priority of the priority ratio of self are the highest, then it is assumed that success, slot p+N can continue to send；
If the priority of oneself is not the highest, then it is assumed that access failure, reselect immediately idle slot (from
Above step 2 starts):
If there being the STI (i.e. everybody is the highest priority) of the priority the same with self, then can be at slot p+
N sends, if the most again there is this situation, then again sends at slot p+2*N with Probability p, thinks with probability (1-p)
Send unsuccessfully, reselect idle slot immediately, perform step 2.
Through said process, node has been successfully accessed system and have selected the time slot of self transmission FI, e.g., refering to Fig. 2
Shown in, node, after monitoring access procedure, have selected the sending time slots that slot 4 is self, and node is successfully sent out on slot 4
After sending FI, just need the feedback according to other nodes, in follow-up flow process, the carrying out of slot 4 is safeguarded.Concrete maintenance process
(it is divided into two kinds of situations) as follows:
(1) completely the same with above step 4 for sending the FI filling method of slot: node use.The most not
Need to empty row (because the most not safeguarding this row) corresponding for slot p in time slot state cache table.
(2) for receiving slot: node maintenance (N-1) * N time slot state cache table and before the slot p+X*N of self
Judging whether successfully, method is the most completely the same with above step 5.
In a word, during channel maintenance, node has only to safeguard (N-1) * N time slot state cache table, it is not necessary to safeguard
N*N time slot state cache table, such as, channel maintenance process is as shown in Figure 4.
But, the design of existing MS-ALOHA algorithm does not takes into account to exist in real system and sends processing delay situation,
Only from theoretical derivation, thus there may be problems with:
1) message is late at transmission time point of eating dishes without rice or wine, and does not considers that there is MAC layer in real system sends processing delay and PHY layer
Send processing delay.
In such cases, if starting just to be transmitted processing from sending slot border, message can be made true eat dishes without rice or wine
Just send time starting point and be necessarily later than transmission slot time slot beginning boundary, cause the delay that message is transmitted.
2) MAC PDU (Medium Access Control Packet Data Unit, medium education are organized in advance
Protocol Data Unit) message send time, do not consider receive MAC-C PDU (Medium Access Control Control-
Packet Data Unit, medium education-control-protocol Data Unit) process time point: in there is no clear and definite time slot
The sequential relationship that reception processes, it is impossible to ensure to be updated the information tissue after processing according to the MAC-C PDU of up-to-date reception
The transmission of FI message.
3), when tissue MAC PDU message sends in advance, PHY layer processing delay and the sequential of MAC layer processing delay are not considered
Relation, it is impossible to process for transmission and the sequential processing mode that in time slot, reasonably the time drives is provided.
Obviously, under prior art, due to the MAC layer not considered and the processing delay of PHY layer so that the transmission of FI message is not
The regulation of relevant criterion can be met, so that redesign related procedure.
Summary of the invention
The embodiment of the present invention provides a kind of data to send the method and device of advanced processing, deposits in order to solving in prior art
Owing to not taking into account MAC layer and PHY layer processing delay, and FI is caused to send the problem being delayed.
The concrete technical scheme that the embodiment of the present invention provides is as follows:
A kind of data send the method for advanced processing, including:
After the MAC layer module of intra-node determines current time slots beginning boundary according to the notice of sync identification module, according to
The MAC layer transmission that this locality is preset processes maximum delay and PHY layer module requires that MAC layer module sends when shifting to an earlier date of MAC-C PDU
The area of a room, determines that this locality proceeds by the latest time point sending Message Processing；
MAC layer module, when less than described latest time point when, starts to be organized in the interior message sent of next time slot
Content.
A kind of data send the device of advanced processing, and this device includes sync identification module, MAC layer module and PHY layer mould
Block, wherein,
Described sync identification module, for notifying current time slots beginning boundary to MAC layer module.
Described MAC layer module, after determining current time slots beginning boundary according to the notice of sync identification module, according to this
The MAC layer transmission preset process maximum delay and PHY layer module requires that MAC layer module sends the pre-set time of MAC-C PDU
Amount, determines that this locality proceeds by the latest time point sending Message Processing；And when less than described latest time point when,
The message content sent in starting to be organized in next time slot.
In the embodiment of the present invention, in order to ensure that each internodal FI message can be opened according to boundary of time slot accurately eating dishes without rice or wine
Beginning is transmitted, node is at the previous time slot of sending time slots, during the transmission of tissue MAC PDU in advance, it is contemplated that PHY layer process
Time delay and the sequential relationship of MAC layer processing delay, for providing the sequential processing mechanism that the rational time drives, specifically in time slot
For: node can process maximum delay according to default MAC layer transmission and PHY layer module requires that MAC layer module sends MAC-C
Amount pre-set time of PDU, determines that this locality proceeds by the latest time point sending Message Processing, and is being not later than this latest time
In the moment of point, proceed by transmission and process.So, each node can according to periodicity timed message at time slot beginning boundary exactly
Proceed by FI message to send so that FI message is alignd with time slot beginning boundary in the real time starting point that sends eated dishes without rice or wine, and has
Effect avoids the message caused because of time delay and is delayed, and has ensured the transmission performance of system
Accompanying drawing explanation
Fig. 1 is superframe structure schematic diagram under prior art；
Fig. 2 is channel occupancy process based on MS-ALOHA algorithm under prior art；
Fig. 3 is N*N two dimension time slot state cache table schematic diagram under prior art；
Fig. 4 is channel maintenance process based on MS-ALOHA algorithm under prior art；
Fig. 5 is handling process timing diagram in time slot in the embodiment of the present invention；
Fig. 6 is to determine in the embodiment of the present invention that MAC layer sends message latest time point flow chart；
Fig. 7 is the first application scenarios lower network topology schematic diagram in the embodiment of the present invention；
Fig. 8 is that during the present invention implements, under the first application scenarios, MAC layer timer internal triggers sequential relationship schematic diagram；
Fig. 9 is that in the embodiment of the present invention, the first application scenarios lower outer portion intervalometer triggers sequential relationship schematic diagram；
Figure 10 is the second application scenarios lower network topology schematic diagram in the embodiment of the present invention；
Figure 11 is that during the present invention implements, under the first application scenarios, MAC layer timer internal triggers sequential relationship schematic diagram；
Figure 12 is that in the embodiment of the present invention, the first application scenarios lower outer portion intervalometer triggers sequential relationship schematic diagram；
Figure 13 is embodiment of the present invention interior joint illustrative view of functional configuration.
Detailed description of the invention
Under prior art, MAC layer module and PHY (Physical, physics) layer module in each node all can send
Time slot beginning boundary, the periodicity timed message receiving sync identification module triggers the transmission process of this time slot.If requiring PHY
Layer start to send MAC PDU at sending time slots beginning boundary, it is contemplated that real system exists MAC layer send processing delay and
PHY layer sends processing delay, then PHY layer cannot eat dishes without rice or wine to send the MAC of this time slot needs transmission at sending time slots beginning boundary
PDU.And if consideration carries out transmission in advance and processes, it is considered however that after the hot information being able to receive that processes, according to up-to-date
Information is transmitted processing.Thus for above-mentioned transmission processing delay problem, the embodiment of the present invention proposes a kind of time driving
Treatment mechanism, it is ensured that MAC PDU proceeds by transmission for the previous period in sending time slots beginning boundary in advance and processes, further
It is also ensured that the MAC PDU of prescribed form according to the message of up-to-date reception, can be generated, tissue sends message, effective guarantee
PHY layer starts to send MAC PDU at sending time slots beginning boundary.
Under the preferred embodiment of the present invention is described in detail combining accompanying drawing.
In order to solve problem present in existing real system, the timer processing mechanism that the condition that is designed with triggers, and
Devise and the abnormal conditions such as resource collision are occurring, terminate treatment mechanism in the time slot of Timing driver.
The handling process that time in certain time slot drives is as it is shown in figure 5, wherein it is determined that MAC layer sends message the latest
Time point detailed process as shown in Figure 6, specific as follows:
Step 600: the MAC layer module of intra-node and PHY layer module receive local synchronization at time slot beginning boundary and award
Time module periodicity timed message, determine that current time slots starts.
Sync identification module typically by the local crystal oscillator of node, external timing signal receive unit, signal processing unit, time
The module compositions such as clock output unit, are responsible for the local clock signal reliably that offer system needs.
As it is shown in figure 5, when the MAC layer module of intra-node and PHY layer module receive the periodicity of sync identification module
During timed message, it is believed that arrive the beginning of certain time slot；In the embodiment of the present invention, a time slot comprises: the MAC-C PDU stage
(being designated as MAC-C PDU in Fig. 5), MAC-D PDU stage (being designated as MAC-D PDU in Fig. 5) and protection time slot (are designated as in Fig. 5
Tg), when receiving the periodicity timed message of sync identification module, if current time slots be node at non-sent time slot, then save
Point carries out the reception (i.e. receive other nodes send FI) of MAC-C PDU in MAC layer module and PHY layer module, if current time
Gap is the sending time slots of node, then node proceeds by the transmission of local mac-C PDU (i.e. to other nodes transmission this locality
FI)。
Step 610:MAC layer module processes maximum delay according to the MAC layer transmission that this locality is preset and (is designated as DMAC_SEND_HANDLE)
Require that MAC layer module sends amount pre-set time (the note D of MAC-C PDU with PHY layer moduleMAC_SEND_CPDU), determine that this locality starts
It is transmitted the point of time slot the latest of Message Processing.
As it is shown in figure 5, the MAC-D PDU (e.g., high level data bag) received in current time slots due to MAC layer module is first
It is buffered in this locality, just sends when next frame starts, and MAC-C PDU to be sent in present frame has cached in previous frame
Finishing, therefore, MAC layer module, during current time slots receives MAC-D PDU, is disposed, then if MAC-C PDU receives
Transmission can be proceeded by process, and receive without waiting for MAC-D PDU, thus, when calculating latest time point, only need
Consider DMAC_SEND_HANDLE and DMAC_SEND_CPDU?.
Step 620:MAC layer, when less than above-mentioned latest time point when, sends in starting to be organized in next time slot
Message content, e.g., according to the MAC-C PDU and the MAC-D PDU of caching of reception from current time slots beginning boundary, according to the rules
The MAC PDC (including MAC-C PDU and PAC-D PDU) that form sends in generating next time slot.
As such, it is possible to PHY layer module is effectively ensured can start MAC PDU on sending time slots (i.e. next time slot) border
Transmission, i.e. PHY layer module is before next sending time slots beginning boundary, and minimum needs shift to an earlier date " DMAC_SEND_HANDLE+
DMAC_SEND_CPDU) " this section of duration proceed by the transmission of next time slot and process, i.e. " next sending time slots initial time
Point-(DMAC_SEND_HANDLE+DMAC_SEND_CPDU) " it is to proceed by the latest time point that transmission processes in advance.
Based in above-described embodiment, it is also preferred that the left in order to ensure that MAC layer module can be according to recently received MAC-C
PDU is transmitted processing, it is also preferred that the left the advanced processing time that MAC layer module is transmitted processing can not be the most forward, it is ensured that
After receiving MAC-C PDU in current time slots and completing to receive inter-process, it is transmitted processing by up-to-date information.In order to reach
To this purpose, in the embodiment of the present invention, it is contemplated that receive MAC-C to PHY layer module in current time slots from time slot beginning boundary
PDU, and receive flow processing through the demodulation of PHY layer, decoding etc., then to PHY layer to MAC layer module reporting MAC-C PDU's
Shi Changwei (DMAC_RCV_CPDU), and MAC layer module is after receiving the MAC-C PDU that PHY layer reports, and carries out the MAC-C of MAC layer
The reception of PDU processes, and reception processing delay is (DMAC_RCV_HANDLE)；So, MAC layer module just determines that current time slots proceeds by
The earliest time point that transmission processes is: time slot beginning boundary+(DMAC_RCV_CPDU+DMAC_RCV_HANDLE) time point of time delay, it is i.e.
Saying, when reaching above-mentioned earliest time point and less than above-mentioned latest time point, MAC layer module proceeds by transmission
Reason, the message content sent in i.e. starting to be organized in next time slot.
In the embodiment of the present invention, above-mentioned DMAC_SEND_HANDLE、DMAC_SEND_CPDU、DMAC_RCV_CPDUAnd DMAC_RCV_HANDLEThe most permissible
It is the parameter being pre-configured with based on experience value, does not repeats them here.
Certainly, refering to shown in Fig. 5, MAC layer module, after being transmitted processing, needs default transmission MAC PDU's
Latest time point, is sent to PHY layer module by the MAC-D PDU of caching in the MAC-C PDU after processing locality and previous frame, with
Ensure that PHY layer module has time enough to carry out information processing when arriving the beginning boundary of next transmission time.
Being not difficult to find out by the description of above-described embodiment, MAC layer module is not to be required for touching in each time slot
Send out data and send advanced processing flow process, i.e. without judging latest time point within each time, or, latest time point and
Early time point, only need to carry out above-mentioned judgement at the previous time slot of the time of transmission, and start a period of time under tissue in the suitable moment
The message content sent in gap, concrete the most machine-processed as described below (wherein, node is sending first MAC-from starting to be linked into
Processing procedure before C PDU is all access procedure, and processing procedure afterwards is all maintenance process):
1) MAC layer module determines when current time slots is the time slot of last in audit window in access procedure, currently
Time slot beginning boundary trigger data sends advanced processing flow process.
In access procedure, owing to node needs to select according to time slot state cache table at last time slot of audit window
Selecting free timeslot, and the free timeslot that may select is next time slot, therefore, node needs last at audit window
Time slot carries out the transmission of next time slot and processes, so MAC layer module needs last the time slot trigger data at audit window
Send advanced processing flow process.
2) MAC layer module determines that current time slots is in access procedure, during the previous time slot of free timeslot that node selects,
Advanced processing flow process is sent in current time slots beginning boundary trigger data.
In access procedure, after node selects free timeslot, lasting snoop procedure judges the free timeslot selected
It is still idle condition, is then selecting the previous time slot of free timeslot, MAC layer module to need trigger data to send advanced processing stream
Journey.
3), when MAC layer determines the previous time slot that current time slots is sending time slots in maintenance process, initiate in current time slots
Border trigger data sends advanced processing flow process.
During node maintenance takies time slot (i.e. sending time slots), if node receives all in lasting snoop procedure
Being positive feedback, then arrive the previous time slot taking time slot safeguarded, MAC layer module needs trigger data to send advanced processing
Flow process.
Based on above-described embodiment, in data send advanced processing flow process, so that latest time point and earliest time need to be judged
As a example by Dian, when implementing, can be in the way of using intervalometer.Particularly as follows: node can set at current time slots beginning boundary
Putting an intervalometer, the duration of this intervalometer is set to a numerical value between above-mentioned earliest time point and latest time point, i.e. [
Early time point, latest time point], when timer expiry, MAC layer module proceeds by transmission and processes, i.e. basis receives
In MAC-C PDU and previous frame, the MAC-D PDU of caching, starts the message content organizing next time slot to send.Such as, time concrete
Prolong information as shown in table 1:
Table 1
The concrete value of above-mentioned each parameter, by exploitation realize personnel according to real system platform property assessment processing delay after
Determine, do not repeat them here.
According to the Delay shown in table 1, it may be determined that the duration span of the intervalometer of MAC layer module reference is
[(DMAC_RCV_CPDU+DMAC_RCV_HANDLE), (DURATIONSLOT-DMAC_SEND_HANDLE-DMAC_SEND_CPDU)]。
In the embodiment of the present invention, intervalometer be provided with two ways, one is MAC layer timer internal, and another kind is
Device time in outside, is introduced separately below.
1, MAC layer timer internal: be arranged on MAC layer, at the previous time slot of sending time slots (described in the most above-mentioned flow process
Current time slots) time slot beginning boundary, MAN layer module start MAC timer internal, MAC timer internal time a length of on
Stating any one numerical value between earliest time point and latest time point, after MAC timer internal time-out, MAC layer module starts
The MAC layer message transmission carrying out next time slot processes.
2, external timer: be allocated to sync identification module when system initialization, at the previous time slot of sending time slots
The time slot beginning boundary of (current time slots described in the most above-mentioned flow process), sync identification module is to MAC layer module and PHY layer mould
Block starts external timer, so, from the beginning of time slot beginning boundary, through intervalometer while sending periodicity timed message
Delaying time long, sync identification module also needs to additionally provide one to send timed message to MAC layer module and triggers MAC layer module
The MAC layer message transmission proceeding by time slot processes.
In like manner, MAC layer is at the previous time slot of only sending time slots, i.e. above-mentioned 1), 2) and 3) in the case of these three
Process the timed message that time service mould sends simultaneously, carry out the MAC layer process that next time slot MAC layer message sends, in other situation
Under receive timed message, can directly abandon this message, not triggering following operation.
Certainly, in actual applications, either MAC layer timer internal or external timer, all it is possible that different
Often, now needing the timer ends making generation abnormal, concrete mode is as follows:
1) MAC layer timer internal.
When MAC layer module judges the next time slot (i.e. sending time slots) of current time slots according to the MAC-C PDU received
Colliding, then stop MAC layer timer internal, the transmission terminating carrying out in advance for next time slot in current time slots processes, joint
Point initiates to access again.
2) external timer.
When MAC layer module judges the next time slot (i.e. sending time slots) of current time slots according to the MAC-C PDU received
When colliding, the timed message triggering transmission process sync identification module sent abandons, under terminating in current time slots being
The transmission that one time slot is carried out in advance processes, and node initiates to access again.
Based on the various embodiments described above, concrete application scenarios is used the application of above-described embodiment to be made the most below
Thin introduction.
The first application scenarios: in access procedure, last time slot in audit window, node receives MAC-C PDU
After, selecting free timeslot is next time slot (i.e. sending time slots).
Refering to shown in Fig. 7, now, it is assumed that before node B accesses, existing 2 bunches, its interior joint A, node C 1 jump joint each other
Point, node A, node D 1 hop node each other, node C and node D 2 hop node each other.Wherein, in the transmission situation of each time slot node
As shown in table 2,
Table 2
(under the first application scenarios, each time slot node sends situation)
So, node B is in access procedure, and concrete processing procedure is as follows:
A1, node B start to access at the time slot 1 of a certain frame, and node B starts the FI of a frame and monitors, according to the FI received
Message is received processing.
(hereinafter referred to as time slot a) starts, and receives sync identification mould monitoring last time slot of a frame for A2, node B
After the time slot beginning boundary timed message that block sends, carry out time-gap number renewal process, i.e. think that time slot a is new reception time slot
Beginning, MAC layer module is that time slot a safeguards different reception time slots and sending time slots numbering respectively, and the time slot of sending time slots is compiled
Number than receive time-gap number carry previous time slot.
A3: if node B uses MAC layer timer internal, the then process that the time in time slot a drives to show inside MAC layer
Meaning flow process is refering to shown in Fig. 8.
As shown in Figure 8, when judge time slot a be node B in access procedure, during last time slot in audit window,
If above-mentioned 1), 2) and 3) one of these three situation, then node B starts MAC layer internal timing at the time slot beginning boundary of time slot a
Device, this MAC layer timer internal time a length of earliest time point to value Tsend between latest time point；
In time slot a, from time slot beginning boundary D the latestMAC_RCV_CPDUReceive the MAC-of the node A that PHY layer module reports
C PDU, processes maximum delay D through MAC layer inside modules receptionMAC_RCV_HANDLE, node B is according to the MAC-C of the node A received
PDU, carries out MAC layer reception process, and before MAC layer timer internal time-out, MAC layer module complete paired node A sends
The process of MAC-C PDU.
If node B collides according to the INFORMATION DISCOVERY next one time slot (i.e. sending time slots) received, then it is fixed to stop
Time device Tsend, the transmission terminating carrying out in advance for next time slot in time slot a processes, and node B initiates access again；Without
Collide, then node B stops intervalometer Tsend, organizes the MAC PDU information that next time slot is to be sent, i.e. proceeds by and send out
Send process.
On the other hand, if node B uses external timer, then process exemplary flow such as Fig. 9 that the time in time slot a drives
Shown in.
Starting different from MAC layer timer internal, external timer, when system initialization, obtains intervalometer from MAC layer
The configuration parameter of duration.
In time slot a, after node B completes the MAC layer reception process of the MAC-C PDU of receiving node A, if according to reception
To INFORMATION DISCOVERY next one time slot (i.e. sending time slots) collide, then the sync identification module cycle that node B will receive
The timed message processed in order to trigger transmission reported directly abandons, the transmission carried out in advance for next time slot in terminating time slot a
Processing, node B initiates to access again；Without colliding, then Node-B receiver in order to trigger transmission process timing
After message, it is judged that next time slot is sending time slots, it is assumed that next time slot is for meeting above-mentioned 1) this situation, then node B starts group
Knit the MAC PDU that next time slot is to be sent, i.e. proceed by transmission and process.
Under the second application scenarios, in maintenance process, arrive a time slot before sending time slots, do not receive MAC-C
PDU。
Refering to shown in Figure 10, it is assumed that there are 2 bunches, its interior joint A, node B, node C 1 hop node each other, node A, joint
Point D 1 hop node each other, node C and node D, node B and node D 2 hop node each other.Wherein, in the transmission feelings of each time slot node
Condition is as shown in table 3:
Table 2
(under the first application scenarios, each time slot node sends situation)
So, node B is in maintenance process, and concrete processing procedure is as follows:
B1, arrive sending time slots previous time slot (hereinafter referred to as time slot b), Node-B receiver to sync identification module sends
After time slot beginning boundary timed message, carry out time-gap number renewal process.Node B thinks that time slot b is opening of new reception time slot
Beginning, MAC layer module time slot b safeguards different reception time slots and sending time slots numbering respectively, and the time-gap number ratio of sending time slots connects
Receive time-gap number and carry previous time slot.
If B2 node B uses MAC layer timer internal, then the process exemplary flow such as figure that the time in time slot b drives
Shown in 11.
When node B judges that time slot b, in maintenance process, is the previous time slot of sending time slots, and is above-mentioned 1), 2) and 3)
These three situation for the moment, starts MAC layer timer internal at time slot beginning boundary, MAC layer timer internal time a length of
Early time point is to value Tsend between latest time point；
In time slot b, if node B begins to pass through PHY layer maximum from time slot beginning boundary receives processing delay
DMAC_RCV_CPDUAnd MAC layer inside modules reception processes maximum delay DMAC_RCV_HANDLE, do not receive MAC-C PDU yet, can be true
Regularly do not receive MAC-C PDU in gap b.By the time intervalometer Tsend time-out, node B organizes the MAC that next time slot is to be sent
PDU information, i.e. proceeds by transmission and processes.
On the other hand, if node B uses external timer, then the process exemplary flow such as figure that the time in time slot b drives
Shown in 12.
Starting different from MAC layer timer internal, external timer, when system initialization, obtains intervalometer from MAC layer
The configuration parameter of duration.
In time slot b, if node B begins to pass through PHY maximum reception from time slot beginning boundary processes time delay DMAC_RCV_CPDU
And MAC layer inside modules reception processes maximum delay DMAC_RCV_HANDLE, do not receive MAC-C PDU yet, it may be determined that in time slot b
Do not receive MAC-C PDU.
So, node B receive sync identification module periodic report in order to trigger transmission process timed message after,
Judge that next time slot is the sending time slots in maintenance process, and above-mentioned 3) this situation, then node B starts to organize next time slot to treat
The MAC PDU information sent, i.e. proceeds by transmission and processes.
Based on above-described embodiment, refering to shown in Figure 13, in the embodiment of the present invention, node include sync identification module 130,
MAC layer module 131 and PHY layer module 132, wherein,
Sync identification module 130, for notifying current time slots beginning boundary to MAC layer module 131 and PHY layer module 132；
MAC layer module 131, after determining current time slots beginning boundary according to the notice of sync identification module 130, according to
The MAC layer transmission that this locality is preset processes maximum delay and PHY layer module requires that MAC layer module sends when shifting to an earlier date of MAC-C PDU
The area of a room, determines that this locality proceeds by the latest time point sending Message Processing；And less than above-mentioned latest time point time
Carve, the message content sent in starting to be organized in next time slot；
PHY layer module 132, for the MAC-C PDU that current time slots receives reports to MAC layer module 133, and receives
MAC PDU to be sent (including MAC-C PDU and MAC-D PDU) after MAC layer module 131 process.
Further, the time slot beginning boundary that MAC layer module 131 is additionally operable to according to this locality is preset receives to PHY layer module
Process the duration of reporting MAC-C PDU and MAC layer module, for the reception processing delay of MAC-C PDU, determine that this locality is opened
Begin to be transmitted the earliest time point of Message Processing, and reach above-mentioned earliest time point and less than above-mentioned latest time point
Moment, the message content sent in starting to be organized in next time slot.
As shown in figure 13, further include in node and module 133 is set, for building fixed one at current time slots beginning boundary
Intervalometer, and the duration of this intervalometer is set to any one number between MAC layer module earliest time point and latest time point
Value, wherein, during timer expiry, the message content that MAC layer module sends in starting to be organized in next time slot.
Concrete, module 133 is set and intervalometer can be arranged MAC layer timer internal, by MAC layer module when current
Gap beginning boundary starts；Or, arranging module 133 can also be set to external timer by intervalometer, in system initial configuration
Stage is arranged in sync identification module, when arriving current time slots beginning boundary, sync identification module is sending periodically
Start while timed message.
In sum, in the embodiment of the present invention, in order to ensure that each internodal FI message can eated dishes without rice or wine according to accurately
Boundary of time slot proceeds by transmission, and node is at the previous time slot of sending time slots, when organizing the transmission of MAC PDU in advance, it is contemplated that
PHY layer processing delay and the sequential relationship of MAC layer processing delay, for the sequential processing providing the rational time to drive in time slot
Mechanism, particularly as follows: node can process maximum delay according to default MAC layer transmission and PHY layer module requires that MAC layer module is sent out
The pre-set time sending MAC-C PDU measures, and determines that this locality proceeds by the latest time point sending Message Processing, and is being not later than this
In the moment of latest time point, proceed by transmission and process.So, each node can play initial line according to periodicity timed message at time slot
Boundary proceeds by FI message exactly and sends so that FI message is at the real transmission time starting point eated dishes without rice or wine and time slot beginning boundary
Alignment, effectively prevent the message caused because of time delay and is delayed, ensured the transmission performance of system
On the other hand, in the embodiment of the present invention, if node considers to receive the process time point of MAC-C PDU further,
The transmission of the time slot state cache table tissue MAC PDU after then can updating according to MAC-C PDU based on up-to-date reception, thus
Improve the accuracy of FI message further.
Those skilled in the art are it should be appreciated that embodiments of the invention can be provided as method, system or computer program
Product.Therefore, the reality in terms of the present invention can use complete hardware embodiment, complete software implementation or combine software and hardware
Execute the form of example.And, the present invention can use at one or more computers wherein including computer usable program code
The upper computer program product implemented of usable storage medium (including but not limited to disk memory, CD-ROM, optical memory etc.)
The form of product.
The present invention is with reference to method, equipment (system) and the flow process of computer program according to embodiments of the present invention
Figure and/or block diagram describe.It should be understood that can the most first-class by computer program instructions flowchart and/or block diagram
Flow process in journey and/or square frame and flow chart and/or block diagram and/or the combination of square frame.These computer programs can be provided
Instruction arrives the processor of general purpose computer, special-purpose computer, Embedded Processor or other programmable data processing device to produce
A raw machine so that the instruction performed by the processor of computer or other programmable data processing device is produced for real
The device of the function specified in one flow process of flow chart or multiple flow process and/or one square frame of block diagram or multiple square frame now.
These computer program instructions may be alternatively stored in and computer or other programmable data processing device can be guided with spy
Determine in the computer-readable memory that mode works so that the instruction being stored in this computer-readable memory produces and includes referring to
Make the manufacture of device, this command device realize at one flow process of flow chart or multiple flow process and/or one square frame of block diagram or
The function specified in multiple square frames.
These computer program instructions also can be loaded in computer or other programmable data processing device so that at meter
Perform sequence of operations step on calculation machine or other programmable devices to produce computer implemented process, thus at computer or
The instruction performed on other programmable devices provides for realizing at one flow process of flow chart or multiple flow process and/or block diagram one
The step of the function specified in individual square frame or multiple square frame.
Although preferred embodiments of the present invention have been described, but those skilled in the art once know basic creation
Property concept, then can make other change and amendment to these embodiments.So, claims are intended to be construed to include excellent
Select embodiment and fall into all changes and the amendment of the scope of the invention.
Obviously, those skilled in the art can carry out various change and modification without deviating from this to the embodiment of the present invention
The spirit and scope of bright embodiment.So, if these amendments of the embodiment of the present invention and modification belong to the claims in the present invention
And within the scope of equivalent technologies, then the present invention is also intended to comprise these change and modification.
Claims (14)
1. the method that data send advanced processing, it is characterised in that including:
The media access control MAC layer module of intra-node determines current time slots beginning boundary according to the notice of sync identification module
After, the MAC layer transmission preset according to this locality processes maximum delay and physical PHY layer module requires that MAC layer module sends media and connects
Enter amount pre-set time of control-control protocol data cell MAC-C PDU, determine that this locality proceeds by transmission Message Processing
Late time point；
MAC layer module, when less than described latest time point when, starts to be organized in the interior message content sent of next time slot.
2. the method for claim 1, it is characterised in that farther include:
MAC layer module according to this locality preset time slot beginning boundary to PHY layer module reception process and reporting MAC-C PDU time
Length and MAC layer module, for the reception processing delay of MAC-C PDU, determine that this locality proceeds by transmission Message Processing the earliest
Time point, and when reaching described earliest time point and less than described latest time point, start to be organized in next time slot
The message content of interior transmission.
3. method as claimed in claim 1 or 2, it is characterised in that described MAC layer module determines that current time slots is access procedure
During last time slot in middle audit window, send advanced processing flow process in current time slots trigger data；Or,
Described MAC layer module determines that current time slots is in access procedure, during the previous time slot of free timeslot that node selects,
Current time slots trigger data sends advanced processing flow process；Or,
When MAC layer determines the previous time slot that current time slots is sending time slots in maintenance process, send out in current time slots trigger data
Send advanced processing flow process.
4. method as claimed in claim 2, it is characterised in that determine described latest time point and earliest time point, reaching
Described earliest time point and the moment less than described latest time point, in the message sent in starting to be organized in next time slot
Hold, including:
Node builds a fixed intervalometer at current time slots beginning boundary, and the duration of this intervalometer is set to described earliest time point
And any one numerical value between latest time point；
During described timer expiry, the message content that MAC layer module sends in starting to be organized in next time slot.
5. method as claimed in claim 4, it is characterised in that farther include:
Described intervalometer is MAC layer timer internal, MAC layer module start at current time slots beginning boundary；Or,
Described intervalometer is external timer, in system initial configuration phase is arranged on sync identification module, current arriving
During time slot beginning boundary, sync identification module start while sending periodicity timed message.
6. method as claimed in claim 5, it is characterised in that when MAC layer module judges to work as according to the MAC-C PDU received
When the next time slot of front time slot collides, according to MAC layer timer internal, then stop MAC layer timer internal, and whole
The transmission only carried out in advance for next time slot in current time slots processes, and according to external timer, then sync identification module is sent out
The timed message processed in order to trigger transmission sent abandons, at the transmission carried out in advance for next time slot in termination current time slots
Reason.
7. method as claimed in claim 4, it is characterised in that including: during described timer expiry, MAC layer module starts group
The message content sent in being woven in next time slot, including:
When described timer expiry, described MAC layer module according to the MAC-C PDU of reception from current time slots beginning boundary and
Medium education-data protocol data unit MAC-D the PDU of caching, format organization sends in next time slot according to the rules
MAC PDU.
8. data send a device for advanced processing, and this device includes sync identification module, media access control MAC layer module
With physical PHY layer module, it is characterised in that
Described sync identification module, for notifying current time slots beginning boundary to MAC layer module；
Described MAC layer module, after determining current time slots beginning boundary according to the notice of sync identification module, pre-according to this locality
If MAC layer transmission process maximum delay and PHY layer module and require that MAC layer module sends medium education-control-agreement number
Measure according to the pre-set time of unit MAC-C PDU, determine that this locality proceeds by the latest time point sending Message Processing；And not
Exceed the moment of described latest time point, the message content sent in starting to be organized in next time slot.
9. device as claimed in claim 8, it is characterised in that described MAC layer module is further used for:
Time slot beginning boundary to the PHY layer module reception preset according to this locality processes duration and the MAC of also reporting MAC-CPDU
Layer module, for the reception processing delay of MAC-C PDU, determines that this locality proceeds by the earliest time point sending Message Processing, and
When reaching described earliest time point and less than described latest time point, send in starting to be organized in next time slot disappears
Breath content.
10. device as claimed in claim 8 or 9, it is characterised in that described MAC layer module determines that current time slots is to access
In journey during the time slot of last in audit window, send advanced processing flow process in current time slots beginning boundary trigger data；Or
Person,
Described MAC layer module determines that current time slots is in access procedure, during the previous time slot of free timeslot that this device selects,
Advanced processing flow process is sent in current time slots beginning boundary trigger data；Or,
When MAC layer determines the previous time slot that current time slots is sending time slots in maintenance process, touch at current time slots beginning boundary
Send out data and send advanced processing flow process.
11. devices as claimed in claim 9, it is characterised in that farther include:
Unit is set, for building a fixed intervalometer at current time slots beginning boundary, and the duration of this intervalometer is set to described
Any one numerical value between earliest time point and latest time point, wherein, during described timer expiry, MAC layer module starts group
The message content sent in being woven in next time slot.
12. devices as claimed in claim 11, it is characterised in that described intervalometer is arranged in MAC layer by the described unit that arranges
Portion's intervalometer, is started at current time slots beginning boundary by MAC layer module；Or, described intervalometer is arranged by the described unit that arranges
For external timer, in system initial configuration phase is arranged on sync identification module, when arriving current time slots beginning boundary,
Started while sending periodicity timed message by sync identification module.
13. devices as claimed in claim 12, it is characterised in that described MAC layer module is further used for:
When judging that the next time slot of current time slots collides according to the MAC-C PDU received, if this device uses MAC layer
Timer internal, then stop MAC layer timer internal, and terminate at the transmission that carries out in advance for next time slot in current time slots
Reason, if this device uses external timer, the then timed message processed in order to trigger transmission sync identification module sent to lose
Abandoning, the transmission terminating carrying out in advance for next time slot in current time slots processes.
14. devices as claimed in claim 11, it is characterised in that including: described MAC layer module specifically for:
During described timer expiry, access according to the MAC-C PDU of reception from current time slots beginning boundary and the media of caching
Control-data protocol data unit MAC-D PDU, the MAC PDU that format organization sends in next time slot according to the rules.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210345876.0A CN103686983B (en) | 2012-09-17 | A kind of data send the method and device of advanced processing |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210345876.0A CN103686983B (en) | 2012-09-17 | A kind of data send the method and device of advanced processing |
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| CN103686983B true CN103686983B (en) | 2016-11-30 |
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