CN104158867A - Information multi-hop forwarding method based on WAVE (wireless access in vehicular environments) protocol - Google Patents
Information multi-hop forwarding method based on WAVE (wireless access in vehicular environments) protocol Download PDFInfo
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Abstract
The invention discloses an information multi-hop forwarding method based on a WAVE (wireless access in vehicular environments) protocol. If information belongs to a multi-hop service, a source node sets a forwarding identification and hop limit in a forwarding control field according to the service type demand of the information, the source node adds a WSA (WAVE service advertiseme) message to the forwarding control field and announces the adding of the WSA message to the forwarding control field in a CCH (common transport channel) time slot, other nodes receive and analyze the WSA message and judge the process modes to the WSA message by the source node according to the forwarding control field, and the process modes comprises reception, application or forwarding; in an SCH (simultaneous channel) time slot, the source node sends a message, a node needing to receive the message receives the message, and if the node needs to forward the message, the node reconstructs the forwarding control field and the WSA message and serves as the source node of the message to forward the message. With adoption of the information multi-hop forwarding method, the forwarding control field is set in the WSA message, so that the information multi-hop forwarding is realized in the WAVE protocol, and the application range of the WAVE application is enlarged.
Description
Technical field
The invention belongs to intelligent transportation system technical field, more specifically say, relate to a kind of information multi-hop retransmission method based on WAVE agreement.
Background technology
Along with the commercialization of 4G starts, the fast development of mobile Internet, and the traffic jam issue that each city faces is serious gradually, intelligent transportation system (ITS, Intelligent Transport System) shows its huge market and development prospect gradually.As one of hot technology in ITS field, WAVE (Wireless Access in Vehicular Environments) agreement Shi You DOT is leading, a set of inter-vehicle communication technology being applicable in vehicle mobile self-organizing network of being formulated by IEEE.WAVE agreement has been followed the hierarchical design of OSI, mobile topological environmental for vehicle has been made optimization, introduced multichannel handover operation, in network layer, used channel allocation mechanism and service broadcast and subscribing mechanism, and designed a kind of WSMP (WAVE Short Message Protocol) agreement and realized the communication of low delay.
The main communication technology that relies on two aspects of car networking: short-distance wireless communication and at a distance mobile communication technology, the former is mainly the 2.4G communication technologys such as RFID sensing equipment and similar WIFI, the latter is mainly the mobile communication technologies such as GPRS, 3G, LTE, 4G.Dedicated Short Range Communications, technology DSRC is that the FCC of FCC distributes 5.9GHz frequency as the technology of intelligent transportation system ITS communication.For meeting In-vehicle networking communication requirement, the IEEE802.11p that IEEE has formulated by IEEE802.11 supplements standard and the IEEE1609 standard bunch WAVE protocol stack jointly forming.
Fig. 1 is WAVE protocol stack structure figure.As shown in Figure 1, the MAC layer of WAVE and PHY layer are based on IEEE802.11p complementary agreement.IEEE802.11p is that the enhancing under vehicle environment supplements to IEEE802.11 standard, in the 5.9GHz of DSRC frequency range, provide between high-speed mobile OBU, OBU with RSU between the ability of exchanges data.With reference to OSI master pattern, IEEE1609.x is positioned on IEEE802.11p, contains data link layer, network layer, transport layer, application layer and In-vehicle networking node administration and communication security and formulates.
As shown in Figure 1, WAVE1609 agreement provides IPv6 agreement and WSMP agreement at datum plane, therefore can select two kinds of modes to transmit data.Wherein, IPv6 be IETF design for substituting current edition IP agreement---the IP next generation protocol of IPv4, follow IETF RFC2460 standard completely.WSMP agreement is a kind of efficient low delay point-to-point communication mode for vehicle environmental design, be applicable between vehicle and vehicle to the communication between the node of roadside.
In WAVE1609 agreement, the use of IPv6 should be noted that following 2 points:
1) the IP parameter of IPv6, as information such as IPv6 address, mask, gateway, DNS, to pass through system manager, or by WME (WAVE Management Entity, WAVE management entity) according to WSA (WAVE Service Advertiseme, WAVE serves bulletin) in information configure, and may be according to application scenario and frequent variations;
2) before using IPv6, must first to WME, carry out service request, and be assigned to after SCH (Traffic Channel), could start to carry out transfer of data with IPv6.
Because the IP parameter of IPv6 is to be configured or configured according to information in WSA by WME by system manager, do not support routing function, so can only being single-hop, message can reach.
The feature of WSMP agreement is, the bottom physical parameter of message (as MAC Address, transmission rate, channel), is directly to be controlled by upper layer application.WSMP is a kind of point-to-point communication protocol, does not support multi-hop to forward, and the object MAC of message must the interior single-hop of current communication range can reach.
In sum, due to the limitation of WSMP agreement itself and the collocation strategy of IPv6 protocol parameter, cause WAVE equipment not possess the ability that multi-hop forwards, only support single-hop message to send.The communication range of WAVE equipment is just restricted like this.In actual car networking, a lot of user application expectations can forward by multi-hop, obtain larger communication range.Table 1 is car working application demand analysis table.
Table 1
Known according to table 1, certain applications, for example security information application, should allow near vehicle node around know in time, can reduce like this generation of traffic accident.The communication range of single-hop is limited, can not allow more vehicle receive security information.Multi-hop can expand the communication range of vehicle, allows the vehicle of farther place also can receive security information.In the application of clean culture, some application expectation can multi-hop be forwarded to the node of farther place.For example V-V mutual (vehicle interactive communication) is a class application relatively more conventional in WAVE application, but vehicle may be in the communication range of the other side's vehicle.If be therefore only single-hop communication, this communication will failure so.If there are the support words of multi-hop, vehicle also can be realized proper communication in larger communication range so.
In WAVE1609 agreement, define a control channel CCH and six service channel SCH.In standard, point out that the default action of WAVE equipment is that CCH and SCH alternately switch.Take 100ms as one-period, wherein first access CCH50ms, and then access SCH50ms, so circulation.Wherein on CCH, be mainly used in transmit management information, comprising topmost WSA (WAVE Service Advertiseme) frame, WSA frame is encapsulated in VSA (Vendor Specific Action) frame and sends, and the upper main transmitting service information of SCH.Selecting which SCH for ISP, is that oneself determines; And for service user, be to obtain by WSA.And the data of IPv6 can only be in SCH channel in this agreement, the data of WSMP can be in CCH and SCH channel.Although six SCH channels can transmit data, accomplish frequency spectrum resource maximum using simultaneously, CCH channel but only has one.CCH will be mainly used in transmitting the information that control and management is relevant, and service data will be in SCH channel.All channels are all shared wireless medium, and message is all directionless diffusion.
Summary of the invention
The object of the invention is to overcome the deficiencies in the prior art, a kind of information multi-hop retransmission method based on WAVE agreement is provided, by add forwarding control field in WSA message, realize information multi-hop and forward, solve the problem that existing WAVE1609 agreement does not support that multi-hop forwards.
For achieving the above object, the information multi-hop retransmission method that the present invention is based on WAVE agreement comprises the following steps:
S1: when source node need to send information, build and forward control field, if information belongs to multi-hop business, according to COS under information and demand, in forwarding control field, arrange and forward sign and jumping figure restriction, forward to be designated and force to forward or optional forwarding, jumping figure is restricted to maximum hop count, if information belongs to single-hop business, forwarding control field is filled to single-hop service identification; Source node adds WSA message by forwarding control field, and WSA is encapsulated in VSA, adds source address and destination address, and in CCH channel time slot, WSA message is noticed on CCH channel, is ready for sending infomational message;
S2: other nodes WSA message that reception sources node sends on CCH channel parsing in vehicle-mounted net, if single-hop business is processed according to single-hop handling process; If multi-hop business is divided into two kinds of situations:
If unicast service judges that whether oneself is the destination node of this message, if so, receives and use message; If not, whether decision node forwards, if need to forward, receives and forwarding information message, otherwise does not do any operation;
If broadcasting service judges whether to need this service, if needed, node judges whether to forward, if need to forward, receives and use infomational message, and forwarding information message, if do not need to forward, only receives and use infomational message; If do not need this service, whether decision node forwards, if need to forward, receives and forwarding information message, otherwise does not do any operation;
Judge whether to need the method forwarding to be: first judgement forwards sign, if forward to be designated, force to forward, be judged to be and need to forward; If forward and be designated optional forwarding, calculate present node available network resource, if available network resource is greater than default forwarded thresholding, is judged to be and needs to forward, otherwise be judged to be, do not need to forward;
S3: in SCH channel time slot, judge that the node need to receive infomational message all switches to the SCH channel of WSA message appointment in source node and step S2, source node sends infomational message, and the node that need to receive infomational message receives infomational message;
S4: node receives after infomational message, if only need to use infomational message, offers application and uses, if also need forwarding information message, first judges whether this infomational message is duplicate message, and if so, dropping packets, does not forward; Otherwise step S2 is resolved to the jumping figure restriction obtaining and subtract 1 as new jumping figure restriction, if current jumping figure restriction is greater than 0, this node is as new source node, former forwarding sign in the WSA message receiving according to CCH time slot and new jumping figure restriction build and forward control field, rebuild WSA message, infomational message is sent, otherwise dropping packets does not forward.
The present invention is based on the information multi-hop retransmission method of WAVE agreement, if information belongs to multi-hop business, source node is according to the demand of the COS of information, in forwarding control field, arrange and forward sign and jumping figure restriction, if belong to single-hop business, forwarding control field is filled to single-hop service identification, source node adds WSA message by forwarding control field and notices at CCH time slot, other nodes receive WSA message and resolve, according to forwarding control field, judge the processing mode of this node to this infomational message, comprise and whether receiving, whether use and whether forward, at SCH time slot, source node sends infomational message, and the node that need to receive infomational message receives infomational message, if node needs forwarding information message, rebuild and forward control field and WSA message, then, as the source node of infomational message, this infomational message is forwarded.
The present invention has following beneficial effect:
(1) the present invention, by forwarding control field is set in WSA message, forwards thereby realize information multi-hop in WAVE agreement;
(2) the information multi-hop retransmission method that the present invention proposes can keep good compatibility with other standards WAVE equipment;
(3) method that the information multi-hop that the present invention proposes forwards, has expanded the scope of application that WAVE applies.
Accompanying drawing explanation
Fig. 1 is WAVE protocol stack structure figure;
Fig. 2 is the message handling process schematic diagram of source node;
Fig. 3 is WSA message structure schematic diagram;
Fig. 4 is the WSA message handling process schematic diagram of forward node and destination node;
Fig. 5 is Fig. 4 repeating judgement handling process schematic diagram;
Fig. 6 is infomational message forward process schematic flow sheet in Fig. 4;
Fig. 7 is the application scenarios of embodiment 1;
Fig. 8 is the workflow diagram of vehicle V1, V2 and V3 in embodiment 1;
Fig. 9 is the application scenarios of embodiment 2;
Figure 10 is the workflow diagram of each vehicle in embodiment 2.
Embodiment
Below in conjunction with accompanying drawing, the specific embodiment of the present invention is described, so that those skilled in the art understands the present invention better.Requiring particular attention is that, in the following description, when perhaps the detailed description of known function and design can desalinate main contents of the present invention, these are described in here and will be left in the basket.
The information multi-hop retransmission method that the present invention is based on WAVE agreement, has mainly utilized WSA message, has increased forwarding control field in WSA message, and the forwarding control field in the WSA message that each node receives by parsing realizes multi-hop and forwards.In multi-hop forwards, can be source node, intermediate node and destination node by the node division in vehicle-mounted net.
Fig. 2 is the message handling process schematic diagram of source node.As shown in Figure 2, the message flow process of source node is:
S201: build and forward control field:
When source node need to send information, first build and forward control field.Forward control field, also claim FCC (Forward Control Character), for description node, whether should forward.Forward control field and comprise forwarding sign and jumping figure restriction.When source node need to send information, just need to build to forward control field, if information belongs to multi-hop business, just in forwarding control field, arrange and forward sign and jumping figure restriction, if belong to single-hop business, forwarding control field is filled to single-hop service identification.Table 2 is to forward control field example.
Table 2
As shown in table 2, in present embodiment, the length that forwards control field is 8bit, and wherein the 1st, 2 identify (FF0, FF1) for forwarding, and whether forwarding sign needs multi-hop forwarding for sign, and employing 01 is expressed as to be forced to forward; 10 represent optional forwarding.The 3rd to 6 is jumping figure restriction (FHL0～FHL3), adopts 0001～1110 to represent the optional value of message jumping figure, and minimum hop count is 1, and maximum hop count is 14.Table 3 is the corresponding tables of jumping figure restriction.7th～8 are total to 2bit is reservation position, inserts 00 or 11.In other single-hop situations, forward control field and be filled to 0x00 or 0xFF.
| Forward jumping figure | Corresponding binary message |
| 1 | 0001 |
| 2 | 0010 |
| 3 | 0011 |
| 4 | 0100 |
| 5 | 0101 |
| 6 | 0110 |
| 7 | 0111 |
| 8 | 1000 |
| 9 | 1001 |
| 10 | 1010 |
| 11 | 1011 |
| 12 | 1100 |
| 13 | 1101 |
| 14 | 1110 |
Table 3
Jumping figure restriction can arrange according to actual needs, and still, due to the restriction of In-vehicle networking, even if jumping figure restriction arranges to such an extent that also cannot reach very greatly satisfied telecommunication effect, therefore generally the maximum of jumping figure restriction is set to 14.
S202: build WSA message:
After forwarding control field builds, forwarding control field is added to WSA message.Fig. 3 is WSA message structure schematic diagram.As shown in Figure 3, in WSA message, comprise information on services, channel information, WAVE routing broadcast etc., in each embodiment of present embodiment, forward control field and be in the information on services extension field that is placed on WSA message.
S203: notice WSA message:
Source node is encapsulated into WSA in VSA, adds source address and destination address, and in CCH channel time slot, WSA message is noticed on CCH channel, builds infomational message to be sent, is ready for sending.When business is broadcast, destination address is broadcast address; When business is clean culture, destination address is destination node address.
S204: send infomational message:
In SCH channel time slot, source node switches to the SCH channel of appointment in WSA message, sends infomational message.According to the parameter of upper strata appointment, by the infomational message building in step S203, WSMP agreement or the IPv6 agreement by WAVE datum plane sends message to source node.
The message handling process of forward node and destination node is basically identical, therefore its handling process is merged to explanation.Fig. 4 is the WSA message handling process schematic diagram of forward node and destination node.As shown in Figure 4, the processing stage of WSA message, the WSA message handling process of forward node and destination node comprises the following steps:
S401: receive and resolve WSA message:
In CCH channel time slot, in vehicle-mounted net, other nodes WSA message that reception sources node sends on CCH channel parsing, obtain forwarding the information such as control field, SCH channel.
S402: resolve according to step S401 the forwarding control field obtaining and judge that whether information type is multi-hop business, if multi-hop business enters step S404, otherwise enters step S403.
S403: process according to single-hop handling process, process according to the handling process in existing WAVE agreement.
S404: determine whether broadcasting packet, if so, enter step S407, otherwise enter step S405.
S405: judge according to destination address whether oneself is the destination node of message, if so, illustrate that message reaches home, enter step S406, otherwise explanation also needs to forward, enter step S411.
S406: receive and use infomational message.Known according to the judgement of step S402, S404, S405, what enter this step is multi-hop unicast service, and this node is the destination node of message.For destination node, should receive infomational message, and process according to the message handling process in WAVE agreement, to application, send service available notice, wait for application call infomational message and process, upper layer application receives after service available notice, as required recalls information message, its detailed process is consistent with prior art, does not repeat them here.The send and receive of infomational message carries out at SCH time slot, enters after SCH time slot, and the node that need to receive infomational message switches to the SCH channel of WSA message appointment, the infomational message that reception sources node sends.
S407: judge whether this node needs this service, whether this information is the information that certain upper layer application needs, and if so, enters step S408, otherwise enters step S411.
S408: whether decision node forwards, if so, enters step S409, otherwise enters step S410.
Fig. 5 is Fig. 4 repeating judgement schematic flow sheet.As shown in Figure 5, forwarding judgement comprises the following steps:
S501: resolve the forwarding control field obtaining according to step S401, judge whether it is to force to forward, if so, illustrate that node must receive this message forward, enter step S504, otherwise enter step S502.
S502: the available network resource ANR (Available Network Resource) that calculates present node.Conventionally the various network resources that available network resource ANR should Comprehensive Assessment present node, storage area, this node of comprising channel resource utilance, present node busy degree, node send many factors that affect network performance such as the successful probability of service, and specific features parameter can be selected as required.In actual applications, the computational methods of the occurrence of available network resource ANR can arrange as required, for example can be according to each characteristic ginseng value weighted average of selecting.
S503: judge whether ANR is greater than default forwarded thresholding, can forward thresholding is the threshold value that present node can E-Packet, if be greater than, illustrates that node can provide resource to carry out message repeating, enters step S504, otherwise enters step S505.
S504: result of determination is needs forwarding.
S505: result of determination forwards for not needing.
S409: receive and use infomational message, forwarding information message.
When message is the needed service of certain upper layer application of this node, no matter whether forward, all to receive and use infomational message.
S410: receive and use infomational message, not forwarding information message.
S411: whether decision node forwards, if so, enters step S412, otherwise enters step S413.
S412: receive infomational message and forward.
S413: do not do any operation, do not carry out any subsequent operation for this message, continue original work.
Although step S408 and step S411 judge whether to forward, and whether need this service, and have the different handling process of two covers according to node, the main distinction is whether use this infomational message.
Fig. 6 is infomational message forward process schematic flow sheet in Fig. 4.As shown in Figure 6, the handling process that infomational message forwards comprises the following steps:
S601: determine whether duplicate message, whether received identical infomational message, if so, enter step S604, otherwise enter step S602.
S602: jumping figure restriction subtracts 1, as new jumping figure restriction, node subtracts 1 by the jumping figure restriction in the WSA message repeating control field receiving at CCH time slot before.
S603: judge whether current jumping figure restriction is greater than 0, if not, enter step S5604, otherwise enter step S605.
S604: dropping packets.
S605: build new forwarding control field: the forwarding in the new jumping figure restriction obtaining according to step S602 and the WSA receiving before identifies to build new forwarding control field.
S606: build new WSA message and notice: the forwarding control field obtaining according to step S605, builds the WSA message of this node forwarding information message, and notice this WSA message when the CCH time slot as source node on CCH channel.
S607: send infomational message: when SCH time slot, node switches to the SCH channel of WSA message appointment, send infomational message.
When WAVE equipment is used certain application service, the classification based on application is selected different handling processes.For single-hop application, normative reference WAVE communication between devices flow process.For the course of work of the present invention is described better, enumerates three different running examples that are applied under different demands and describe.
Embodiment 1
The road condition safety information that the is applied as application of the present embodiment.Fig. 7 is the application scenarios of embodiment 1.As shown in Figure 7, have 6 cars in its application scenarios, wherein V1 finds that there is traffic accident occur to need this information to other vehicle transmission, adopt multi-hop to force to forward to reach fast, efficiently, timely by information transmission.Only with vehicle V1, V2 and V3, the workflow that in the present embodiment, information sends is described below.
Fig. 8 is the workflow diagram of vehicle V1, V2 and V3 in embodiment 1.As shown in Figure 8, in embodiment 1, the workflow of vehicle V1, V2 and V3 is as follows:
1) 0～50ms:CCH working time slot
Vehicle V1, as the source node of this road condition safety information, in order to reach the transmission demand of information in the present embodiment, arranges the FCC=0x78 in WSA, i.e. FCC=(01111000)
2, representing that the infomational message that vehicle V1 sends belongs to pressure forwarding, the jumping figure of forwarding is restricted to 14.Build the WSA message of this information, it is SCH that SCH channel is set
1, destination node address is broadcast address, and as source node, on CCH, notices this WSA message.Vehicle V1 encapsulation road condition safety infomational message, is ready for sending.
Because vehicle V2 is within the scope of a jumping of vehicle V1, vehicle V2 listens at CCH time slot the WSA message that vehicle V1 sends, and parsing can obtain this information and belong to pressure forwarding type, and information transmitting channel is SCH
1.Judge that known vehicle V2 needs this service, so being operating as of vehicle V2 receives and uses infomational message, forwarding information message.
2) 50～100ms:SCH working time slot
Vehicle V1 and vehicle V2 all switch to SCH
1message sends and receives information.
By packaged infomational message, WSMP agreement or the IPv6 agreement by WAVE datum plane sends vehicle V1.
Vehicle V2 offers application use after receiving infomational message, and forward, because the restriction of jumping figure is now 13 after subtracting 1, be greater than 0, therefore now vehicle V2 rebuilds new WSA message according to the WSA message of the vehicle V1 receiving in a upper CCH time slot, comprise copying forwarding sign and reseting jumping figure restriction, and the own SCH channel that will work in next SCH is set in WSA, in the present embodiment, SCH working channel is set is SCH to vehicle V2
2.
3) 100～150ms:CCH working time slot
The WSA message that vehicle V2 now builds in this CCH time slot sends previous step on CCH channel as the source node of this road condition safety information.
Vehicle V3 within the scope of one jumping listens to the WSA that vehicle V2 sends at CCH channel, the same with vehicle V2 before, and parsing can obtain this information and belong to pressure forwarding type, and information transmitting channel is SCH
2.Judge that known vehicle V3 needs this service, so the operation of vehicle V3 is similarly and receives and use infomational message, forwarding information message.
4) 150～200ms:SCH working time slot
Vehicle V2 and vehicle V3 all switch to SCH
2message sends and receives information.
By packaged infomational message, WSMP agreement or the IPv6 agreement by WAVE datum plane sends vehicle V2.
Vehicle V3 offers application use after receiving infomational message, and forward, because the restriction of jumping figure is now 12 after subtracting 1, be greater than 0, therefore now vehicle V3 rebuilds new WSA message according to the WSA message of the vehicle V2 receiving in a upper CCH time slot, comprise copying forwarding sign and reseting jumping figure restriction, and the own SCH channel that will work in next SCH is set in WSA.
By that analogy, constantly repeat reception and the repeating process in time slot, enter jumping figure and be restricted to 0, thereby reach the effect that road condition safety diffusion of information is gone out.And other jump the vehicle of scope at vehicle V1 mono-, vehicle V5 for example, its course of work is identical with vehicle V2, because each vehicle is the broadcast mode adopting when forwarding, therefore each vehicle needs to judge whether to receive this message after receiving this infomational message, if once received, do not deal with, in order to avoid waste Internet resources.
Embodiment 2
The present embodiment be applied as Internet access service.By the demand of Internet access service is analyzed, can know that this service needs multi-hop, but might not need node to force to forward to its message, optional forwarding can meet this demand for services.Fig. 9 is the application scenarios of embodiment 2.As shown in Figure 9, in the present embodiment, vehicle V6 needs Internet access service, the Internet service that roadside unit RSU is needed is by vehicle V1 access WAVE network, each node by calculate own current available network resource ANR and with oneself forwarded thresholding comparison, selectivity forwards.
Table 4 is communication ranges of each vehicle in embodiment 2.For convenience of description, suppose that each vehicle position in the present embodiment message transmitting procedure is relatively static.
| Car number | Communication range |
| V1 | V2，V4 |
| V2 | V3，V5，V6 |
| V3 | V2，V6 |
| V4 | V5 |
| V5 | V4，V2，V6 |
| V6 | V2，V3，V5 |
Table 4
Figure 10 is the workflow diagram of each vehicle in embodiment 2.As shown in figure 10, in embodiment 2, the workflow of each vehicle is as follows:
1) 0～50ms:CCH working time slot
Vehicle V1 is the source node in WAVE network as this message, and the transmission demand according to message, arranges the FCC=0xA8 in WSA, i.e. FCC=(10101000)
2, represent that the infomational message that vehicle V1 sends belongs to optional forwarding, forward jumping figure and be restricted to 10.Build the WSA message of this information, it is SCH that SCH channel is set
1, destination node address is destination address, i.e. the address of vehicle V6, and as source node, on CCH, notice this WSA message.
Vehicle V2 and vehicle V4 listen at CCH time slot the WSA message that vehicle V1 sends, and parsing can obtain this information and belong to optional forwarding type, and information transmitting channel is SCH
1.Vehicle V2 and vehicle V4 judgement are known oneself is not destination node, judges whether to forward.Vehicle V2 and V4 calculate respectively node available network resource ANR separately, and by ANR and separately node can forward thresholding comparison, the ANR of the two is all greater than and can forwards thresholding, so vehicle V2 and V4 add forwarding.In summary, vehicle V2 and V4 receive only infomational message and forward, and do not use infomational message.
2) 50～100ms:SCH working time slot
Vehicle V1 and V2, V4 all switch to SCH
1message sends and receives information.
By packaged infomational message, WSMP agreement or the IPV6 agreement by WAVE datum plane sends vehicle V1.
Vehicle V2 receives after infomational message, because the restriction of jumping figure is now 9 after subtracting 1, be greater than 0, therefore now vehicle V2 rebuilds new WSA message according to the WSA message of the vehicle V1 receiving in a upper CCH time slot, comprise copying and forward sign and reset jumping figure restriction, and the own SCH channel that will work in next SCH is set in WSA message, in the present embodiment, SCH working channel is set is SCH to vehicle V2
2.
Vehicle V4 receives after message, because the restriction of jumping figure is now 9 after subtracting 1, be greater than 0, therefore now vehicle V2 rebuilds new WSA message according to the WSA message of the vehicle V1 receiving in a upper CCH time slot, comprise copying and forward sign and reset jumping figure restriction, and the own SCH channel that will work in next SCH is set in WSA message, in the present embodiment, SCH working channel is set is SCH4 to vehicle V4.
3) 100～150ms:CCH working time slot
The WSA that vehicle V2 and vehicle V4 build in now sending previous step as source node when the CCH time slot on CCH channel respectively.
Vehicle V3 listens to the WSA message that vehicle V2 sends at CCH channel, and resolving and obtaining this information is optional forwarding type.Vehicle V3 judgement is known oneself is not destination node, judges whether to forward.Calculate this node ANR, ANR and this node can be forwarded to thresholding comparison, ANR is less than or equal to and can forwards thresholding, does not therefore forward this message.
Vehicle V5 listens to the WSA message that vehicle V4 sends at CCH channel, and resolving and obtaining this information is optional forwarding type.Vehicle V5 judgement is known oneself is not destination node, judges whether to forward.Calculate this node ANR, ANR and this node can be forwarded to thresholding comparison, ANR is less than or equal to and can forwards thresholding, does not therefore forward this message.
Vehicle V6 listens to the WSA message that vehicle V2 sends at CCH channel, resolves and obtains its destination node address for self address, therefore receives and use infomational message.
4) 150～200ms:SCH working time slot
Vehicle V2 and vehicle V6 all switch to SCH
2message sends and receives information.Vehicle V4 switches to SCH
4channel sends infomational message.
Vehicle V2 by packaged infomational message the WSMP agreement by WA vehicle VE datum plane or IPV6 agreement at SCH
2channel sends.
Vehicle V4 by packaged infomational message the WSMP agreement by WA vehicle VE datum plane or IPV6 agreement at SCH
4channel sends.
Vehicle V6 receives after the infomational message of vehicle V2, and resolving information message sends service available notice to respective application, no longer forwards this message.
Other vehicles continue to operate in the own channel of work in the original plan.
Although above the illustrative embodiment of the present invention is described; so that those skilled in the art understand the present invention; but should be clear; the invention is not restricted to the scope of embodiment; to those skilled in the art; as long as various variations appended claim limit and definite the spirit and scope of the present invention in, these variations are apparent, all utilize innovation and creation that the present invention conceives all at the row of protection.
Claims (3)
1. the information multi-hop retransmission method based on WAVE agreement, is characterized in that, comprises the following steps:
S1: when source node need to send information, build and forward control field, if information belongs to multi-hop business, according to COS under information and demand, forwarding sign and jumping figure restriction are set in controlling forwarding field, forward and be designated pressure forwarding or optional forwarding, jumping figure is restricted to maximum hop count, if information belongs to single-hop business, forwarding control field is filled to single-hop service identification; Source node adds WSA message by forwarding control field, and WSA is encapsulated in VSA, adds source address and destination address, and in CCH channel time slot, WSA message is noticed on CCH channel, is ready for sending infomational message;
S2: other nodes WSA message that reception sources node sends on CCH channel parsing in vehicle-mounted net, if single-hop business is processed according to single-hop handling process; If multi-hop business is divided into two kinds of situations:
If unicast service judges that whether oneself is the destination node of this message, if so, receives and use message; If not, whether decision node forwards, if need to forward, receives and forwarding information message, otherwise does not do any operation;
If broadcasting service judges whether to need this service, if needed, node judges whether to forward, if need to forward, receives and use infomational message, and forwarding information message, if do not need to forward, only receives and use infomational message; If do not need this service, whether decision node forwards, if need to forward, receives and forwarding information message, otherwise does not do any operation;
Judge whether to need the method forwarding to be: first judgement forwards sign, if forward to be designated, force to forward, be judged to be and need to forward; If forward and be designated optional forwarding, calculate present node available network resource, if available network resource is greater than default forwarded thresholding, is judged to be and needs to forward, otherwise be judged to be, do not need to forward;
S3: in SCH channel time slot, judge that the node need to receive infomational message all switches to the SCH channel of WSA message appointment in source node and step S2, source node sends infomational message, and the node that need to receive infomational message receives infomational message;
S4: node receives after infomational message, if only need to use infomational message, offers application and uses, if also need forwarding information message, first judges whether this infomational message is duplicate message, if so, dropping packets,, do not forward; Otherwise step S2 is resolved to the jumping figure restriction obtaining and subtract 1 as new jumping figure restriction, if current jumping figure restriction is greater than 0, this node is as new source node, former forwarding sign in the WSA message receiving according to CCH time slot and new jumping figure restriction build and forward control field, rebuild WSA message, infomational message is sent, otherwise dropping packets does not forward.
2. information multi-hop retransmission method according to claim 1, is characterized in that, described forwarding control field is arranged in the business information extension field of WSA message.
3. information multi-hop retransmission method according to claim 1, is characterized in that, described jumping figure restriction maximum is 14.
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