CN103248463B - A kind of method and apparatus of transmission frame information - Google Patents
A kind of method and apparatus of transmission frame information Download PDFInfo
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- CN103248463B CN103248463B CN201210025471.9A CN201210025471A CN103248463B CN 103248463 B CN103248463 B CN 103248463B CN 201210025471 A CN201210025471 A CN 201210025471A CN 103248463 B CN103248463 B CN 103248463B
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Abstract
The invention discloses a kind of method and apparatus of transmission frame information (FI), the method comprises: sending node carries out busy judgement for time slot each in superframe; Sending node judges whether to need instruction ephemeral terminations mark (STI) for time slot each in superframe; Sending node arranges the frame information that will send according to judged result, and described frame information comprises each Time Slot Occupancy bitmap (bitmap).Receiving node receives and getting frame information; Receiving node takies bitmap information according to described current time slots, and self current channel occupancy situation, self to one or more information in the FI maintenance condition of sending node and the feature of current time slots, that determines this time slot takies situation.The program can reduce FI protocol overhead greatly, improves the index such as resource utilization ratio and throughput of system.
Description
Technical field
The present invention relates to ad hoc network field, refer to a kind of method and apparatus of transmission frame information (FrameInformation, FI) especially.
Background technology
RR-ALOHA is access based on TDMA and resource allocation mechanism.After node occupies a time slot, by periodically sending FI, carry the Time Slot Occupancy situation oneself directly perceived in FI, the time slot service condition in the last superframe within the scope of the jumping namely detected.The FI that each node sends by monitoring surroundings nodes, can judge each Time Slot Occupancy situation in adjacent double bounce bunch, thus realizes the time interval resource that coverage disjoint jumps between (Onehop, OH) bunch and reuse.
Fig. 1 is that in prior art, terminal propagates FI schematic diagram in single-hop bunch A, B and C.Shown in Figure 1, in figure, 1-7 represents node, elliptic region A, B, C represent a jumping (OH) bunch, all nodes in each OH bunch bunch in enjoy full-mesh, can not direct communication if the node in different bunches does not belong to all bunches of common subset, the node belonging to A, B, C bunch of common subset can communicate with nodes all in other bunches, and OH bunch with common node forms an adjacent double bounce (TH) bunch.Can know that 3 bunches, all node slot time take situation from FI-4 (FI of node 4) and FI-5: for FI-3, if all nodes (2,3 in its OH bunch, 4,5,6) k-N time slot is all AVAILABLE, then k time slot is AVAILABLE; If have the time slot of at least one node to be identified as BUSY in its OH bunch, then node 3 is RESERVED in k time slot mark.
In RR-ALOHA, when new node adds network, a primary channel (BC) (corresponding resource reservation unit must be obtained.A resource reservation unit can be that a time slot also can corresponding multiple time slot.In data transmission procedure, if terminal does not initiatively abandon time interval resource corresponding to BC, then can use the slot transmission data taken, other nodes can not use this time slot in the meantime always.
From the angle of this node, each activation node thinks that time slot allocation takies situation with fix information institutional framework FI instruction by periodically sending.In each superframe, node all must send FI in the BC of oneself, and to upgrade in time Time Slot Occupancy state according to the FI of neighbors and the channel usage of oneself, and the Time Slot Occupancy state after upgrading is embodied in the FI oneself sent.
In RR-ALOHA, FI is a vector be made up of N number of time slot (timeslot number comprised in superframe) state information.As shown in Figure 2 a, in a superframe in 7 time slots time slot 0, time slot 1, time slot 3 and time slot 6 by C
bC, B, C
sCtake with A.
Terminal oneself intercepts acquisition in top n time slot to the FI that other-end sends, and the FI of node A on its BC as shown in Figure 2 b.As shown in Figure 2 b, in the FI that terminal sends, the status indication information of each time slot is made up of 12bit, is respectively:
Time Slot Occupancy status indication information (1bit): time slot state in FI, when dividing into groups by correct reception or sending, time slot is labeled as busy (BUSY1), otherwise is labeled as the spare time (FREE0);
Take the temporary mark (SourceTemporaryIdentifier, STI) (8bit) of corresponding time slot terminal;
Send priority instruction (2bit) of data;
PTP business instruction (1bit);
Therefore, the FI transmitted is needed to need 12 × N number of bit altogether in each time slot.
When terminal meets the FI listening to other-end transmission, need the seizure condition according to each time slot of content update receiving FI.Time Slot Occupancy has two states: reserved (RESERVED) state or available (AVAILABLE) state.Time Slot Occupancy condition adjudgement rule is as follows:
Rule 1: from time slot (K-N) in time slot (K-1), time slot (K-N) is marked as busy by the FI that sending node j at least receives a node feeding back in OH bunch, then K time slot is marked as and preengages (RESERVED), otherwise is labeled as available (AVAILABLE).
When sending FI, node receives FI according in previous superframe length, determines the seizure condition of each time slot in superframe, generates the FI shown in Fig. 2 a.Due to the difference of node present position, therefore the Time Slot Occupancy situation of each node perceived is different, the FI that each node sends only reflects the Time Slot Occupancy situation oneself perceived, therefore only determine the seizure condition of the time slot sent in FI in the FI that each node sends according to the FI oneself directly monitored at corresponding time slot, and do not indicate the seizure condition of third party's time slot in FI, indicate the seizure condition of third party's time slot according in reception FI.Such as, node A only listens to the FI of Node B transmission in a super frame period at time slot 5, the FI middle finger of Node B is shown in time slot 3 and is taken by node C, and at this moment, the FI that A node sends only indicates time slot 5 to be taken by B, and does not indicate time slot 3 to be taken by C node.
FI makes node can grasp the distribution condition of (Radio Resource beyond double bounce can be multiplexing) time slot within the scope of double bounce, safeguards occupying BC channel, reduces conflict, improves resource utilization.
The major function of FI: be inform channel conditions, solves hiding, exposed node problems; In ADhoc mode whether access node accessed simultaneously and successfully adjudicate.Specific to a node, during as sending node, the channel occupancy condition information that take and notice the jumping that oneself listen within the scope of of surroundings nodes oneself to current time slots is informed, to realize reliable resource reservation and collision detection within the scope of double bounce by the FI of oneself; During as receiving node, from the FI of other node, learn a jumping bunch and two to jump bunch in resource condition information, comprise oneself current resource taken and whether collide.Specifically, if receiving node does not also have BC, its seizure condition indication information by the request time slot in the FI that receives in feedback window and the temporary mark taking request time slot terminal judge whether oneself successfully accesses.If receiving node has safeguarded the BC of oneself, its by monitoring reception constantly to FI in the seizure condition indication information of request time slot and the temporary mark that takies request time slot terminal judge whether oneself can hold over BC channel.
In RR-ALOHA mechanism, each " stablizing " node adding network in each super frame period, oneself BC must send FI, obviously, current FI expense is very large, to cause in real system resource utilization and throughput too low, therefore need to be optimized design to the generating mode of FI.
Although Resourse Distribute by two jump bunch in units of carry out multiplexing, but each node only needs the Time Slot Occupancy situation indicating oneself and oneself a jumping neighbors in RR-ALOHA mechanism, on average, there is time slot over half to be that corresponding seizure condition identification bit is designated as idle condition in the FI that each node sends, reduce the service efficiency of resource.Idle condition, does not need 12 bits.
In RR-ALOHA mechanism, in FI, the seizure condition of each time slot identifies except seizure condition identification bit, also to point out that the STI taken corresponding to corresponding time slot node identifies whether to collide, the time slot that the seizure condition listened to is not changed all carry in each FI its correspondence STI information and in stable network topology situation, what only need to indicate channel takies situation, and STI is otiose., also can cause the great wasting of resources.
In RR-ALOHA mechanism, in FI, the seizure condition of each time slot identifies except seizure condition identification bit, also to point out that the STI taken corresponding to corresponding time slot node identifies whether to collide, also the STI position (as shown in Figure 2 b) needing reserved time slot corresponding when time slot is not occupied, in addition, the STI information that the time slot do not changed to the seizure condition listened to all carries its correspondence in each FI also can cause the great wasting of resources.
In basic RR-ALOHA mechanism, FI is except instruction Time Slot Occupancy state and STI information corresponding to time slot, also carries time slot and sends the precedence information of data and the PTP indication bit for supporting PTP to transmit.For these two information bits, under part system is arranged, can cancel.
Therefore, need for above problem, need to do corresponding enhancing to RR-ALOHA, namely under the prerequisite do not reduced, reduce protocol overhead, improve resource utilization.
Summary of the invention
The invention provides a kind of method and device of transmission frame information, the protocol overhead of FI can be reduced.
The method of a kind of sending node transmission frame information that the embodiment of the present invention provides, the method comprises:
Sending node carries out busy judgement for time slot each in superframe, and judges whether to need in the FI that will send, indicate ephemeral terminations to identify STI for time slot each in superframe;
Sending node arranges the FI that will send according to judged result, and described FI comprises each Time Slot Occupancy bitmap bitmap.
The method of a kind of receiving node getting frame information that the embodiment of the present invention provides, the method comprises:
Receiving node receives and in getting frame information, current time slots takies bitmap information;
Receiving node takies bitmap information according to described current time slots, and self current channel occupancy situation, self to one or more information in the FI maintenance condition of sending node and the feature of current time slots, that determines this time slot takies situation.
The device of a kind of sending node transmission frame information that the embodiment of the present invention provides, this device comprises:
Judging unit, for carrying out busy judgement for time slot each in superframe, and judges whether to need to indicate STI in the FI that will send for time slot each in superframe;
Control unit, for arranging the FI that will send according to judged result, and described FI comprises each Time Slot Occupancy bitmap bitmap.
The device of a kind of receiving node getting frame information that the embodiment of the present invention provides, this device comprises:
Receiving element, takies bitmap information for current time slots in reception also getting frame information;
Determining unit, for taking bitmap information according to described current time slots, and self current channel occupancy situation, self to one or more information in the FI maintenance condition of sending node and the feature of current time slots, that determines this time slot takies situation.
In the present invention program, sending node carries out busy judgement for time slot each in superframe; Sending node arranges the frame information that will send according to judged result, and described frame information comprises each Time Slot Occupancy bitmap bitmap.Receiving node receives and in getting frame information, current time slots takies bitmap information; Receiving node takies bitmap information according to described current time slots, and self current channel occupancy situation, self to one or more information in the FI maintenance condition of sending node and the feature of current time slots, that determines this time slot takies situation.The program can reduce FI protocol overhead greatly, improves the index such as resource utilization ratio and throughput of system.
Accompanying drawing explanation
Fig. 1 is that in prior art, terminal propagates FI schematic diagram in single-hop bunch A, B and C;
Fig. 2 a is the structural representation of a FI; Fig. 2 b is the FI schematic diagram needing in each time slot to transmit;
Fig. 3 is the simplification FI structural representation of the embodiment of the present invention;
Fig. 4 is the method flow schematic diagram of the sending node transmission frame information of the embodiment of the present invention;
Fig. 5 is the method flow schematic diagram of the receiving node transmission frame information of the embodiment of the present invention;
The apparatus structure schematic diagram of a kind of sending node transmission frame information that Fig. 6 provides for the present embodiment;
The apparatus structure schematic diagram of a kind of receiving node getting frame information that Fig. 7 provides for the present embodiment;
Fig. 8 is the scene schematic diagram of jumping cluster node in specific embodiment one for two;
Fig. 9 is that in specific embodiment one, existing node slot time takies list.
Embodiment
In order under the prerequisite of not influential system performance, reduce FI protocol overhead.In the present invention program, sending node carries out busy judgement for time slot each in superframe, and judges whether to need in the FI that will send, indicate ephemeral terminations to identify STI for time slot each in superframe; Sending node arranges the FI that will send according to judged result, and described FI comprises each Time Slot Occupancy bitmap bitmap.Receiving node receives and in getting frame information, current time slots takies bitmap information; Take bitmap information according to described current time slots, and self current channel occupancy situation, self to one or more information in the FI maintenance condition of sending node and the feature of current time slots, that determines this time slot takies situation.
Shown in Figure 4, the method for a kind of sending node transmission frame information of the embodiment of the present invention comprises the following steps:
Step 401: sending node carries out busy judgement for time slot each in superframe.
Step 402: sending node judges whether to need to indicate ephemeral terminations to identify STI in the FI that will send for time slot each in superframe.
Step 403: sending node arranges the FI that will send according to judged result, and described FI comprises each Time Slot Occupancy bitmap bitmap.
Here, can be divided into two kinds of situations, the first situation, if the time slot of current judgement is free timeslot, then the FI sent comprises the seizure condition of this time slot for idle, and does not comprise any ephemeral terminations mark STI.
The second situation, if the time slot of current judgement is busy time slot, if the time slot of current judgement is busy time slot, one or more information in the channel condition information safeguarded during channel condition information, transmission frame information last time of described sending node according to self current maintenance and system traffic demand and priority resources preemption mechanism, determine whether to need to indicate STI in the FI that will send.
For the second situation, can specifically be subdivided into following embodiment:
If when this time slot described once sends FI on this sending node, the seizure condition of this time slot is busy, and the temporary mark taking the terminal of this time slot is identical with the current temporary mark taking the terminal of this time slot, then the described FI that will send comprises the occupancy of this time slot, be now busy, and do not comprise the ephemeral terminations mark STI of the node taking this time slot.
If when this time slot described once sends FI on this sending node, the seizure condition of this time slot is busy, and the temporary mark taking the terminal of this time slot is not identical with the current temporary mark taking the terminal of this time slot, then the described FI that will send comprises the occupancy of this time slot, be now busy, and comprise the ephemeral terminations mark STI of the node taking this time slot.
If when this time slot described once sends FI on this sending node, the seizure condition of this time slot is idle, then the described FI that will send comprises the occupancy of this time slot, is now busy, and comprises the ephemeral terminations mark STI of the node taking this time slot.
If according to system traffic demand, determine the PTP mark needing the corresponding business of time slot, then described FI comprises PTP mark, if determine the PTP mark not needing the corresponding business of time slot, does not then comprise PTP mark in described FI.
If according to system traffic demand and priority resources preemption mechanism, determine the PRI mark needing the corresponding business of time slot, then described FI comprises PTP mark, if determine the PRI mark not needing the corresponding business of time slot, does not then comprise PTP mark in described FI.
Shown in Figure 3, the simplification FI of the embodiment of the present invention comprises priority and there is indication information, this node FI and neighbors FI, and wherein, priority existence is designated as optional.This node FI can comprise the time slot index (7 bits or 8 bits) of current time slots information (9 bit) and other time slots, current time slots information comprises PRI (2bit), STI (8bit) and whether BC (1bit) information, wherein, PRI (2bit) is for optional, and neighbors FI comprises each Time Slot Occupancy bitmap, priority list (optional), STI existence instruction list and STI list.
Shown in Figure 5, the method for a kind of receiving node getting frame information of the embodiment of the present invention specifically comprises the steps:
Step 501: receiving node receives and in getting frame information, current time slots takies bitmap bitmap information;
Step 502: receiving node takies bitmap information according to described current time slots, and self current channel occupancy situation, self to one or more information in the FI maintenance condition of sending node and the feature of current time slots, that determines this time slot takies situation.
In step 502, if current time slots is not the channel place time slot of receiving node, then receiving node determines that this time slot is for take.
In step 502, if current time slots is the time slot at the channel place that receiving node is safeguarded, and described sending node is not the node that receiving node is safeguarded, the seizure condition of this time slot is idle, then ignore this time slot.
If current time slots is receiving node safeguard the time slot at channel place, and described sending node is not the node that receiving node is safeguarded, the seizure condition of this time slot is busy, but do not comprise the ephemeral terminations mark taking this time slot in described FI, then receiving node thinks that this sending node gives negative feedback for the Time Slot Occupancy of oneself, now, receiving node thinks that oneself BC takies failure, needs again to access.
If current time slots is the time slot at the channel place that receiving node is safeguarded, and described sending node is not the node that receiving node is safeguarded, in described FI, the seizure condition of current time slots is busy, described FI comprises the ephemeral terminations mark taking this time slot, and described ephemeral terminations mark is identical with self temporary mark, then receiving node thinks that the time slot that this sending node takies for oneself gives positive feedback.
If current time slots is the time slot at the channel place that receiving node is safeguarded, and described sending node is not the node that receiving node is safeguarded, in described FI, the seizure condition of current time slots is busy, but described FI comprises the ephemeral terminations mark taking this time slot, and described ephemeral terminations mark is identical with self temporary mark, then receiving node thinks that this sending node gives negative feedback for the Time Slot Occupancy of oneself, now, receiving node thinks that oneself BC takies failure, needs again to access.
If current time slots is the time slot at the channel place that receiving node is safeguarded, and described sending node is the node that receiving node is safeguarded, in described FI, the seizure condition of current time slots is idle, then receiving node is thought needs access failure again to access.
If current time slots is the time slot at the channel place that receiving node is safeguarded, and described sending node is the node that receiving node is safeguarded, the seizure condition of current time slots is busy, but described FI comprises the ephemeral terminations mark taking this time slot, and described ephemeral terminations mark is identical with self temporary mark, then receiving node thinks that the time slot that this sending node takies for oneself gives positive feedback.
If current time slots is the time slot at the channel place that receiving node is safeguarded, and described sending node is the node that receiving node is safeguarded, the seizure condition of current time slots is busy, but do not comprise the ephemeral terminations mark taking this time slot in described FI, then receiving node thinks that this sending node gives positive feedback for the Time Slot Occupancy of oneself.
If current time slots is the time slot at the channel place that receiving node is safeguarded, and described sending node is the node that receiving node is safeguarded, the seizure condition of current time slots is busy, described FI comprises the ephemeral terminations mark taking this time slot, and described ephemeral terminations mark is not identical with self temporary mark, then receiving node thinks that this sending node gives negative feedback for the Time Slot Occupancy of oneself, now, receiving node thinks that oneself BC takies failure, needs again to access.
Shown in Figure 6, the device of a kind of sending node transmission frame information that the present embodiment provides comprises: judging unit 61 and control unit 62.
Judging unit 61, for carrying out busy judgement for time slot each in superframe, and judges whether to need to indicate STI in the FI that will send for time slot each in superframe;
Control unit 62, for arranging the frame information that will send according to judged result, and described frame information comprises each Time Slot Occupancy bitmap bitmap.
Described control unit 62, if be free timeslot for the time slot of current judgement, then the FI sent comprises the seizure condition of this time slot for idle, and does not comprise any ephemeral terminations mark STI.
Described control unit 62, if the time slot for current judgement is busy time slot, one or more information in the channel condition information safeguarded during channel condition information, transmission frame information last time of described sending node according to self current maintenance and system traffic demand and priority resources preemption mechanism, determine whether to need to indicate STI in the FI that will send.
Described control unit 62, if when this time slot described once sends FI on this sending node, the seizure condition of this time slot is busy, and the temporary mark taking the terminal of this time slot is identical with the current temporary mark taking the terminal of this time slot, then the described FI that will send comprises the occupancy of this time slot, be now busy, and do not comprise the ephemeral terminations mark STI of the node taking this time slot.
Described control unit 62, if when this time slot described once sends FI on this sending node, the seizure condition of this time slot is busy, and the temporary mark taking the terminal of this time slot is not identical with the current temporary mark taking the terminal of this time slot, then the described FI that will send comprises the occupancy of this time slot, be now busy, and comprise the ephemeral terminations mark STI taking this time slot.
Described control unit 62, if when this time slot described once sends FI on this sending node, the seizure condition of this time slot is idle, then the described FI that will send comprises the occupancy of this time slot, be now busy, and comprise the ephemeral terminations mark STI taking this time slot.
Described control unit 62, if for according to system traffic demand, determine the PRI mark needing the corresponding business of time slot, then described FI comprises PRI mark, if determine the PRI mark not needing the corresponding business of time slot, does not then comprise PRI mark in described FI.
Described control unit 62, if for according to system traffic demand and priority resources preemption mechanism, determine the PRI mark needing the corresponding business of time slot, then described FI comprises PRI mark, if determine the PRI mark not needing the corresponding business of time slot, then do not comprise PRI mark in described FI.
Shown in Figure 7, the device of a kind of receiving node getting frame information that the present embodiment provides comprises: receiving element 71 and determining unit 72, wherein,
Receiving element 71, takies bitmap information for current time slots in reception also getting frame information;
Determining unit 72, for taking bitmap information according to described current time slots, and self current channel occupancy situation, self to one or more information in the FI maintenance condition of sending node and the feature of current time slots, that determines this time slot takies situation.
Described determining unit 72, if be not the time slot at channel place that receiving node is safeguarded for current time slots, then receiving node determines that this time slot is for take.
Described determining device 72, if be the time slot at channel place that receiving node is safeguarded for current time slots, and described sending node is not the node that receiving node is safeguarded, the seizure condition of this time slot be the free time, then ignore this time slot.
Described determining device 72, if for the time slot that current time slots is the channel place that receiving node is safeguarded, and described sending node is not the node that receiving node is safeguarded, the seizure condition of this time slot is busy, but do not comprise the ephemeral terminations mark taking this time slot in described FI, then receiving node is thought needs the channel occupancy failure of self again to access.
Described determining unit 72, if for the time slot that current time slots is the channel place that receiving node is safeguarded, and described sending node is not the node that receiving node is safeguarded, in described FI, the seizure condition of current time slots is busy, described FI comprises the ephemeral terminations mark taking this time slot, and described ephemeral terminations mark is identical with self temporary mark, then receiving node thinks that the time slot that this sending node takies for oneself gives positive feedback.
Described determining unit 72, if for the time slot that current time slots is the channel place that receiving node is safeguarded, and described sending node is not the node that receiving node is safeguarded, in described FI, the seizure condition of current time slots is busy, but described FI comprises the ephemeral terminations mark taking this time slot, and described ephemeral terminations mark is identical with self temporary mark, then receiving node is thought needs access failure again to access.
Described determining unit 72, if for the time slot that current time slots is the channel place that receiving node is safeguarded, and described sending node is the node that receiving node is safeguarded, in described FI, the seizure condition of current time slots is idle, then receiving node is thought needs access failure again to access.
Described determining unit 72, if for the time slot that current time slots is the channel place that receiving node is safeguarded, and described sending node is the node that receiving node is safeguarded, the seizure condition of current time slots is busy, but do not comprise the ephemeral terminations mark taking this time slot in described FI, then receiving node thinks that this sending node gives positive feedback for the Time Slot Occupancy of oneself.
Described determining unit 72, if for the time slot that current time slots is the channel place that receiving node is safeguarded, and described sending node is the node that receiving node is safeguarded, the seizure condition of current time slots is busy, described FI comprises the ephemeral terminations mark taking this time slot, and described ephemeral terminations mark is not identical with self temporary mark, then receiving node is thought needs the channel occupancy failure of self again to access.
Lift specific embodiment below and describe technical scheme of the present invention in detail.
Embodiment 1: have a new node just to start application BC and do not receive the embodiment of the FI of any node do not safeguarded.
In the present embodiment, current super frame is X superframe, and superframe length is 7slots, and for two jumping cluster node schematic diagrames shown in Fig. 8, in node A and B stable existence and bunch 1, node A and node D stable existence are in bunches 2.Node C just starting up, need request BC resource, the BC of other nodes takies slotlist as shown in Figure 9, node C has heard the FI of node A and Node B in audit window, after monitoring terminates, have selected slot3 and send FI, subsequent feedback window interior nodes C has heard again the FI of node A and Node B.
A concrete implementation process is as follows:
(1) first newly added node C intercepts channel, and time of intercept is a superframe.
(2) node of current steady, comprise node A, C and D all to need to send FI on the BC of oneself correspondence, node A and Node B are a hop node of node C, and node D is two hop nodes of node C, here for a hop node node A of the node C newly accessed.When superframe Xslot6, node A needs to send FI.
In the Time Slot Occupancy bitmap of node A in FI, the channel occupancy situation that slot1, slot2 and slot6 are corresponding is busy, and other slot occupancies are free; For slot1, slot2, because Node B and node D all stable existence in network, do not need to send STI, namely slot1 and slot2 seizure condition mark when a upper superframe node A sends FI is all busy, and the temporary mark of Time Slot Occupancy terminal that the temporary mark taking the terminal of corresponding time slot and node A this moment safeguard is identical, in this case, node only needs the occupancy indicating this time slot to be denoted as busy when sending FI, does not need to indicate the temporary mark taking this time slot terminal.
Such as only consider broadcast communication at present or realize point to point link by MAC Address mode or other modes, this time does not need PTPflag;
Consider that it is not very reliable for carrying out priority preemption mechanism according to RR-ALOHA algorithm, and the business demand of system designed by considering at present and concrete priority resources preemption mechanism can ensure the access priority of different business, this time has not needed PTPflag;
(3) receiving node utilizes the FI received to upgrade time slot state table, and the node C only and newly accessed here is example;
New starter node C, by the monitoring to FI in audit window, knows slot1, slot2 and slot6 is occupied at present, and slot1 is taken by two hop nodes, slot2 and slot6 is taken by hop node B and A respectively.
(4) ask the node of BC resource by time slot state table, Stochastic choice free timeslot K sends FI, and starts to intercept channel;
Specifically, after audit window terminates, new starter node C is { BC that the time slot that in slot0, slot3, slot4, slot5}, Stochastic choice one is idle is selected as oneself, and the FI sending oneself on the time slot selected in idle slot.
(5) node C is after slot3 sends FI, a hop node of node C---after comprising node A and Node-B receiver to the FI information of node C, need to do corresponding process.Node A and Node B just need the feedback information indicated new access node in upper once each self-corresponding FI.Still, for node A, after the FI message of correct receiving node C, when superframe X+1slot6, node A needs the FI sending oneself.
Now, in the FI information of node A except the instruction to Node B, node D and the BC of oneself, the feedback to node C is also comprised.Namely for the slot3 that node C selects, because of slot3 on node a once send FI time its seizure condition be designated free, then now, node A send FI time except needing the occupancy indicating this time slot to be denoted as busy, also need to indicate the temporary mark taking this time slot terminal, i.e. the STI of node C.Indicate to indicate with STI by the occupancy of time slot and jointly complete the positive feedback of node A to the Time Slot Occupancy of node C.
(6) whether node C intercepts a super frame tim e length, preengage and successfully judge, if namely node A and Node B all give node C positive feedback, node C thinks that oneself accesses successfully.Otherwise, think and need access failure to restart to monitor.
What provide above is the behavior of new access node, and for having BC and occurring for bunch node merged, the behavior of node is also consistent, repeats no more here.
Embodiment 2: have a new node just to start application BC and have received the embodiment of the FI of the node do not safeguarded.
The thinking of this enforcement is identical with embodiment 1, namely sending node needs the channel condition information according to oneself current maintenance and determines this FI in conjunction with the channel occupancy information that a upper superframe is safeguarded, but for receiving node, the place different from embodiment 1 is that receiving node still have received the FI of the node oneself do not safeguarded after selecting BC.Node C has only heard the FI of Node B in audit window, and namely node C does not hear the FI that node A sends, and in feedback window, have received the FI of node A transmission, and now, node A, for node C, is the node do not safeguarded.In feedback window, node C is as receiving node, and the same FI needing to send according to node A, the BC in conjunction with oneself judges according to corresponding criterion.
With embodiment 1, above-mentioned behavior for have BC and occur bunch merge node for, behavior is also consistent, repeats no more here.
The solution of the present invention is compared with the FI transmit mechanism of existing basic RR-ALOHA mechanism, and the channel information safeguarded when sending node is by also combining last transmission FI according to the channel condition information of oneself current maintenance and other information determine this FI.The FI that receiving node receives according to this, and take situation in conjunction with oneself current BC, oneself carries out respective handling to the FI maintenance condition of sending node and the feature of current time slots.The program can reduce FI protocol overhead greatly, improves the index such as resource utilization ratio and throughput of system.
The FI of existing basic RR-ALOHA mechanism and the FI resource requirement after improving are analyzed as follows:
(1) basic FI design, FI expense is as shown in table 1.Each time slot adopts 12bit to represent in FI.
The basic FI expense of table 1
(2) the FI design after improving
After improving, FI message is elongated, and content arrangement is as follows:
First bitmap mode is adopted to indicate the occupancy instruction bit of each time slot, carry out indicating (the corresponding bit of each resource allocation unit in units of resource allocation unit, be used to indicate the not busy busy condition of each resource allocation unit), bitmap length equals the resource allocation unit number comprised in superframe.(Part1：Bitmap1)
After above-mentioned bitmap, then adopt bitmap mode to indicate each occupied resource allocation unit uses in the terminal of this resource allocation unit and last superframe and use the terminal of this resource allocation unit whether to be same terminal.This bitmap length equals occupied resource allocation unit number in superframe.(Part2：Bitmap2)
To occupied and and occupied terminal not resource allocation unit together in last superframe, provide the STI of the occupied terminal after the change of each resource allocation unit.This partial-length equals the resource allocation unit number * STI length that the relation that takies occurs.(Part3：STIlist)
From analyzing above, the length of TDadhocDSRC mechanism FI is change, length=Part1+Part2+Part3.
FI after improvement designs resource overhead changes ratio impact by the user of the resources occupation rate in super frame period, last superframe and current use same asset allocation units.If the user of last superframe and the same time slot of current use changes ratio when being 5%, FI expense corresponding in different superframe slots occupation proportion situation is in Table.
Table 2 is for improving neighborhood information territory expense in FI
Show more known by table 1 and table 2, the FI design after improvement greatly reduces the expense of FI.
Those skilled in the art should understand, embodiments of the invention can be provided as method, system or computer program.Therefore, the present invention can adopt the form of complete hardware embodiment, completely software implementation or the embodiment in conjunction with software and hardware aspect.And the present invention can adopt in one or more form wherein including the upper computer program implemented of computer-usable storage medium (including but not limited to magnetic disc store, CD-ROM, optical memory etc.) of computer usable program code.
The present invention describes with reference to according to the flow chart of the method for the embodiment of the present invention, equipment (system) and computer program and/or block diagram.Should understand can by the combination of the flow process in each flow process in computer program instructions realization flow figure and/or block diagram and/or square frame and flow chart and/or block diagram and/or square frame.These computer program instructions can being provided to the processor of all-purpose computer, special-purpose computer, Embedded Processor or other programmable data processing device to produce a machine, making the instruction performed by the processor of computer or other programmable data processing device produce device for realizing the function of specifying in flow chart flow process or multiple flow process and/or block diagram square frame or multiple square frame.
These computer program instructions also can be stored in can in the computer-readable memory that works in a specific way of vectoring computer or other programmable data processing device, the instruction making to be stored in this computer-readable memory produces the manufacture comprising command device, and this command device realizes the function of specifying in flow chart flow process or multiple flow process and/or block diagram square frame or multiple square frame.
These computer program instructions also can be loaded in computer or other programmable data processing device, make on computer or other programmable devices, to perform sequence of operations step to produce computer implemented process, thus the instruction performed on computer or other programmable devices is provided for the step realizing the function of specifying in flow chart flow process or multiple flow process and/or block diagram square frame or multiple square frame.
Although describe the preferred embodiments of the present invention, those skilled in the art once obtain the basic creative concept of cicada, then can make other change and amendment to these embodiments.So claims are intended to be interpreted as comprising preferred embodiment and falling 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 to the present invention and not depart from the spirit and scope of the present invention.Like this, if these amendments of the present invention and modification belong within the scope of the claims in the present invention and equivalent technologies thereof, then the present invention is also intended to comprise these change and modification.
Claims (31)
1. a method of sending node transmission frame information FI, is characterized in that, the method comprises:
Sending node carries out busy judgement for time slot each in superframe, and judges whether to need in the FI that will send, indicate ephemeral terminations to identify STI for time slot each in superframe;
If the time slot of current judgement is free timeslot, then the FI sent comprises the seizure condition of this time slot for idle, and does not comprise any STI;
If the time slot of current judgement is busy time slot, one or more information in the channel condition information safeguarded during channel condition information, transmission frame information last time of described sending node according to self current maintenance and system traffic demand and priority resources preemption mechanism, determine whether to need to indicate STI in the FI that will send;
Wherein, described FI comprises each Time Slot Occupancy bitmap bitmap.
2. method according to claim 1, it is characterized in that, if when this time slot described once sends FI on this sending node, the seizure condition of this time slot is busy, and the temporary mark taking the terminal of this time slot is identical with the current temporary mark taking the terminal of this time slot, then the described FI that will send comprises the occupancy of this time slot, is now busy, and does not comprise the ephemeral terminations mark STI of the node taking this time slot.
3. method according to claim 1, it is characterized in that, if when this time slot described once sends FI on this sending node, the seizure condition of this time slot is busy, and the temporary mark taking the terminal of this time slot is not identical with the current temporary mark taking the terminal of this time slot, then the described FI that will send comprises the occupancy of this time slot, is now busy, and comprises the ephemeral terminations mark STI of the node taking this time slot.
4. method according to claim 1, it is characterized in that, if when this time slot described once sends FI on this sending node, the seizure condition of this time slot is idle, then the described FI that will send comprises the occupancy of this time slot, be now busy, and comprise the ephemeral terminations mark STI of the node taking this time slot.
5. method according to claim 1, is characterized in that, if according to system traffic demand, determine the PTP mark needing the corresponding business of time slot, then described FI comprises PTP mark, if determine the PTP mark not needing the corresponding business of time slot, does not then comprise PTP mark in described FI.
6. method according to claim 1, it is characterized in that, if according to system traffic demand and priority resources preemption mechanism, determine the PRI mark needing the corresponding business of time slot, then described FI comprises PTI mark, if determine the PRI mark not needing the corresponding business of time slot, then do not comprise PTIA mark in described FI.
7. a method for receiving node getting frame information, is characterized in that, the method comprises:
Receiving node receives and in getting frame information, current time slots takies bitmap information;
Receiving node takies bitmap information according to described current time slots, and self current channel occupancy situation, self to one or more information in the FI maintenance condition of sending node and the feature of current time slots, that determines this time slot takies situation;
Wherein, described sending node carries out busy judgement for time slot each in superframe, and judges whether to need in the FI that will send, indicate ephemeral terminations to identify STI for time slot each in superframe; If the time slot of current judgement is free timeslot, then the FI sent comprises the seizure condition of this time slot for idle, and does not comprise any STI; If the time slot of current judgement is busy time slot, one or more information in the channel condition information safeguarded during channel condition information, transmission frame information last time of described sending node according to self current maintenance and system traffic demand and priority resources preemption mechanism, determine whether to need to indicate STI in the FI that will send.
8. method according to claim 7, is characterized in that, if current time slots is not the channel place time slot of receiving node, then receiving node determines that this time slot is for take.
9. method according to claim 7, is characterized in that, if current time slots is the time slot at the channel place that receiving node is safeguarded, and described sending node is not the node that receiving node is safeguarded, the seizure condition of this time slot is idle, then ignore this time slot.
10. method according to claim 7, it is characterized in that, if current time slots is the time slot at the channel place that receiving node is safeguarded, and described sending node is not the node that receiving node is safeguarded, the seizure condition of this time slot is busy, but do not comprise the ephemeral terminations mark taking this time slot in described FI, then receiving node is thought needs the channel occupancy failure of self again to access.
11. methods according to claim 7, it is characterized in that, if current time slots is the time slot at the channel place that receiving node is safeguarded, and described sending node is not the node that receiving node is safeguarded, in described FI, the seizure condition of current time slots is busy, described FI comprises the ephemeral terminations mark taking this time slot, and described ephemeral terminations mark is identical with self temporary mark, then receiving node thinks that the time slot that this sending node takies for oneself gives positive feedback.
12. methods according to claim 7, it is characterized in that, if current time slots is the time slot at the channel place that receiving node is safeguarded, and described sending node is not the node that receiving node is safeguarded, in described FI, the seizure condition of current time slots is busy, but described FI comprises the ephemeral terminations mark taking this time slot, and described ephemeral terminations mark is identical with self temporary mark, then receiving node is thought needs access failure again to access.
13. methods according to claim 7, it is characterized in that, if current time slots is the time slot at the channel place that receiving node is safeguarded, and described sending node is the node that receiving node is safeguarded, in described FI, the seizure condition of current time slots is idle, then receiving node is thought needs access failure again to access.
14. methods according to claim 7, it is characterized in that, if current time slots is the time slot at the channel place that receiving node is safeguarded, and described sending node is the node that receiving node is safeguarded, the seizure condition of current time slots is busy, but described FI comprises the ephemeral terminations mark taking this time slot, and described ephemeral terminations mark is identical with self temporary mark, then receiving node thinks that the time slot that this sending node takies for oneself gives positive feedback.
15. methods according to claim 7, it is characterized in that, if current time slots is the time slot at the channel place that receiving node is safeguarded, and described sending node is the node that receiving node is safeguarded, the seizure condition of current time slots is busy, but do not comprise the ephemeral terminations mark taking this time slot in described FI, then receiving node thinks that this sending node gives positive feedback for the Time Slot Occupancy of oneself.
16. methods according to claim 7, it is characterized in that, if current time slots is the time slot at the channel place that receiving node is safeguarded, and described sending node is the node that receiving node is safeguarded, the seizure condition of current time slots is busy, and described FI comprises the ephemeral terminations mark taking this time slot, and described ephemeral terminations mark is not identical with self temporary mark, then receiving node is thought needs the channel occupancy failure of self again to access.
The device of 17. 1 kinds of sending node transmission frame information, is characterized in that, this device comprises:
Judging unit, for carrying out busy judgement for time slot each in superframe, and judges whether to need to indicate STI in the FI that will send for time slot each in superframe;
Control unit, if be free timeslot for the time slot of current judgement, then the FI sent comprises the seizure condition of this time slot for idle, and does not comprise any ephemeral terminations mark STI; If the time slot of current judgement is busy time slot, one or more information in the channel condition information safeguarded during channel condition information, transmission frame information last time of described sending node according to self current maintenance and system traffic demand and priority resources preemption mechanism, determine whether to need to indicate STI in the FI that will send, described FI comprises each Time Slot Occupancy bitmap bitmap.
18. devices according to claim 17, it is characterized in that, described control unit, if when this time slot described once sends FI on this sending node, the seizure condition of this time slot is busy, and the temporary mark taking the terminal of this time slot is identical with the current temporary mark taking the terminal of this time slot, then the described FI that will send comprises the occupancy of this time slot, be now busy, and do not comprise the ephemeral terminations mark STI of the node taking this time slot.
19. devices according to claim 17, it is characterized in that, described control unit, if when this time slot described once sends FI on this sending node, the seizure condition of this time slot is busy, and the temporary mark taking the terminal of this time slot is not identical with the current temporary mark taking the terminal of this time slot, then the described FI that will send comprises the occupancy of this time slot, be now busy, and comprise the ephemeral terminations mark STI of the node taking this time slot.
20. devices according to claim 17, it is characterized in that, described control unit, if when this time slot described once sends FI on this sending node, the seizure condition of this time slot is idle, then the described FI that will send comprises the occupancy of this time slot, is now busy, and comprises the ephemeral terminations mark STI of the node taking this time slot.
21. devices according to claim 17, it is characterized in that, described control unit, if for according to system traffic demand, determine the PTP mark needing the corresponding business of time slot, then described FI comprises PTP mark, if determine the PTP mark not needing the corresponding business of time slot, does not then comprise PTP mark in described FI.
22. devices according to claim 17, it is characterized in that, described control unit, if for according to system traffic demand and priority resources preemption mechanism, determine the PRI mark needing the corresponding business of time slot, then described FI comprises PRI mark, if determine the PRI mark not needing the corresponding business of time slot, does not then comprise PRI mark in described FI.
The device of 23. 1 kinds of receiving node getting frame information, is characterized in that, this device comprises:
Receiving element, takies bitmap information for current time slots in reception also getting frame information;
Determining unit, for taking bitmap information according to described current time slots, and self current channel occupancy situation, self to one or more information in the FI maintenance condition of sending node and the feature of current time slots, that determines this time slot takies situation;
Wherein, described sending node carries out busy judgement for time slot each in superframe, and judges whether to need in the FI that will send, indicate ephemeral terminations to identify STI for time slot each in superframe; If the time slot of current judgement is free timeslot, then the FI sent comprises the seizure condition of this time slot for idle, and does not comprise any STI; If the time slot of current judgement is busy time slot, one or more information in the channel condition information safeguarded during channel condition information, transmission frame information last time of described sending node according to self current maintenance and system traffic demand and priority resources preemption mechanism, determine whether to need to indicate STI in the FI that will send.
24. devices according to claim 23, is characterized in that, described determining unit, if be not the time slot at the channel place that receiving node is safeguarded for current time slots, then receiving node determines that this time slot is for take.
25. devices according to claim 23, is characterized in that, described determining unit, if for current time slots be the time slot at the channel place of the maintenance of receiving node, and described sending node is not the node that receiving node is safeguarded, the seizure condition of this time slot is idle, then ignore this time slot.
26. devices according to claim 23, it is characterized in that, described determining unit, if for the time slot that current time slots is the channel place that receiving node is safeguarded, and described sending node is not the node that receiving node is safeguarded, the seizure condition of this time slot is busy, but does not comprise the node ephemeral terminations mark taking this time slot in described FI, then receiving node is thought needs the channel occupancy failure of self again to access.
27. devices according to claim 23, it is characterized in that, described determining unit, if for the time slot that current time slots is the channel place that receiving node is safeguarded, and described sending node is not the node that receiving node is safeguarded, in described FI, the seizure condition of current time slots is busy, described FI comprises the ephemeral terminations mark of the node taking this time slot, and described ephemeral terminations mark is identical with self temporary mark, then receiving node thinks that the time slot that this sending node takies for oneself gives positive feedback.
28. devices according to claim 23, it is characterized in that, described determining unit, if for the time slot that current time slots is the channel place that receiving node is safeguarded, and described sending node is not the node that receiving node is safeguarded, in described FI, the seizure condition of current time slots is busy, but described FI comprises the ephemeral terminations mark taking this time slot, and described ephemeral terminations mark is different from self temporary mark, then receiving node is thought needs access failure again to access.
29. devices according to claim 23, it is characterized in that, described determining unit, if for the time slot that current time slots is the channel place that receiving node is safeguarded, and described sending node is the node that receiving node is safeguarded, in described FI, the seizure condition of current time slots is idle, then receiving node is thought needs access failure again to access.
30. devices according to claim 23, it is characterized in that, described determining unit, if for the time slot that current time slots is the channel place that receiving node is safeguarded, and described sending node is the node that receiving node is safeguarded, the seizure condition of current time slots is busy, but does not comprise the ephemeral terminations mark taking this time slot in described FI, then receiving node thinks that this sending node gives positive feedback for the Time Slot Occupancy of oneself.
31. devices according to claim 23, it is characterized in that, described determining unit, if for the time slot that current time slots is the channel place that receiving node is safeguarded, and described sending node is the node that receiving node is safeguarded, the seizure condition of current time slots is busy, described FI comprises the ephemeral terminations mark taking this time slot, and described ephemeral terminations mark is not identical with self temporary mark, then receiving node is thought needs channel maintenance failure again to access.
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| CN103379541B (en) * | 2012-04-12 | 2016-04-20 | 电信科学技术研究院 | A kind of transmission method of frame information FI message and device |
| CN104427617B (en) * | 2013-08-19 | 2018-03-30 | 大唐电信科技产业控股有限公司 | A kind of resource instruction and determination method, apparatus |
| CN104581819A (en) * | 2013-10-25 | 2015-04-29 | 电信科学技术研究院 | Slot resource collision determination method and device |
| CN104918281B (en) * | 2014-03-10 | 2019-02-12 | 大唐电信科技产业控股有限公司 | A kind of method and device that data are sent |
| CN103929824A (en) * | 2014-03-26 | 2014-07-16 | 中国人民解放军总参谋部第六十三研究所 | Wireless network node neutral access dynamic configuration method |
| CN105025513B (en) * | 2014-04-30 | 2019-05-28 | 电信科学技术研究院 | A kind of time slot state maintaining method and device |
| CN106488564B (en) * | 2015-08-31 | 2019-09-17 | 大唐电信科技产业控股有限公司 | A kind of transmission method and device of frame information |
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