CN102724728A - Expanding ring synchronization-based regional route establishment method in wireless network - Google Patents
Expanding ring synchronization-based regional route establishment method in wireless network Download PDFInfo
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- CN102724728A CN102724728A CN2012101484205A CN201210148420A CN102724728A CN 102724728 A CN102724728 A CN 102724728A CN 2012101484205 A CN2012101484205 A CN 2012101484205A CN 201210148420 A CN201210148420 A CN 201210148420A CN 102724728 A CN102724728 A CN 102724728A
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Abstract
The invention discloses an expanding ring synchronization-based regional route establishment method in a wireless network. The regional route establishment process is divided into a plurality of atomic operations, and a certain time interval is inserted between the adjacent atomic operations so as to guarantee the synchronization accuracy of multiple regional route establishment processes. The above algorithm of the invention does not reduce the rationality of the established regional route, while at the same time greatly reduces the transmission number of broadcast packets in the network and further reduces the energy cost of the route establishment process.
Description
Technical field
The invention belongs to wireless network route construction technical field, be specifically related in a kind of wireless network based on the synchronous regional method for routing foundation of expanded ring.
Background technology
In some radio sensing networks based on heterogeneous nodes, there is two or more different nodes type in network.For the network that has two kinds of node types, the node of claiming a fairly large number of responsible perceptional function is a sensing node, and what calculating and communication capacity were enhanced is the enhancement mode node.Can use special-purpose wireless channel to communicate between the enhancement mode node, each enhancement mode node will be responsible for safeguarding the sensing node of its region and set up route with it and connect, and claims that this route is regional route, and is as shown in Figure 1.
Foundation for regional route; General fashion is to let each enhancement mode node initiate the broadcasting of a route request information RREQ at the whole network (or in bigger existence jumping figure radius); Each enhancement mode that each sensing node analysis is received saves indexs (Metrics) such as the entrained jumping figure of RREQ message, energy indication, and then makes the most reasonably Route Selection.Though this routing form can let most of sensing node select the most rational enhancement mode node and add its zone, obviously, the generation of too much broadcast makes that the energy expense of setting up regional route by this way is excessive.
Summary of the invention
The object of the invention is to provide in a kind of wireless network based on the synchronous regional method for routing foundation of expanded ring, solved radio sensing network in the prior art and set up technical problems such as the energy expense of regional route is excessive.
In order to solve these problems of the prior art, technical scheme provided by the invention is:
Based on the synchronous regional method for routing foundation of expanded ring, be provided with control centre, gateway node, the sensing node of being responsible for perceptional function and responsible sensing node in the said wireless network and safeguard the enhancement mode node that is connected with route in a kind of wireless network; It is characterized in that said method comprising the steps of:
(1) control centre sends LARES Synchronization Control message to gateway node, said gateway node with LARES Synchronization Control message to the enhancement mode node broadcasts;
(2) after the enhancement mode node receives LARES Synchronization Control message, read LARES Synchronization Control message and obtain to wait for the jumping figure temporal information;
(3) after the enhancement mode node was waited for the wait jumping figure time of LARES Synchronization Control message, sensing node was broadcasted the LARE control messages in its region, and set up the regional route of its region synchronously through expanded ring.
Preferably; Reply RREP message to node and select to add the enhancement mode node and be regarded as atomic operation with sending or transmit LARE control messages and sensing node between the node in the said method step (3), and atomic operation is set behind atomic operation at every turn carries out Synchronous Processing blanking time.
Preferably, when the setting in the atomic operation time interval was satisfied packet and in network, propagated in the longest path in the said method step (3), the atomic operation cumulative time error of its maximum possible was less than the atomic operation time interval.
Preferably, the enhancement mode node may further comprise the steps the transmitting-receiving of LARES Synchronization Control message in the said method:
A) after the enhancement mode node is received LARES Synchronization Control message, judge whether to handle for the first time LARES Synchronization Control message; When for the first time locating LARES Synchronization Control message, the route entry that provides the path to create gateway node by LARES Synchronization Control message, C set by step) carry out, otherwise judge whether the path that LARES Synchronization Control message provides is nearer;
When B) path that provides of LARES Synchronization Control message is nearer, the new route direction and the jumping figure information updating gateway node route entry that provide according to LARES Synchronization Control message, otherwise ending method;
C) upgrade jumping figure, LARE stand-by period and the energy indication field of LARES Synchronization Control message, with the LARES Synchronization Control information broadcast after upgrading to next hop neighbor node; Open LARE then and send LARE broadcast messages to be sent such as waiting timer.
Preferably, sensing node may further comprise the steps the transmitting-receiving of LARE control messages in the said method:
A) sensing node is received the LARE control messages that the enhancement mode node is set up, and creates the route entry of enhancement mode node direction, opens the RREP transmission timer and waits for atomic operation blanking time;
B) the RREP transmission timer is received from all after overtime and is selected the more excellent node of energy the enhancement mode node of its LARE control messages, sends RREP message, opens the RREP transmission timer and waits for atomic operation blanking time;
C) sensing node judges whether the overtime RREP message before of RREP transmission timer sends success; When sending successfully, receive the suitable zone of selection its LARE control messages from all after the LARE transmission timer is overtime, and send RREP message to this regional enhancement mode node; Otherwise reselect the enhancement mode node, and send RREP message to it.
What the present invention obtained a kind of wireless network region route sets up algorithm synchronously; Through regional route is set up operating process atomization; A kind of notion of atomic operation has promptly been proposed; Provide route and set up each atomic operation of process, and insert the time interval of certain-length, and then improve the synchronization accuracy that a plurality of regional routes are set up process in the adjacent atom operation.
Regional route of the present invention is set up algorithm based on synchronous expanded ring; Network is initiated the route of its region synchronously and is set up process through control each enhancement mode node to a kind of Synchronization Control message of enhancement mode node (or leader cluster node) broadcasting; This synchronization message is controlled the jumping figure time that each enhancement mode node (or leader cluster node) initiated area route is set up required wait before through wait jumping figure time field is set; Node is at every turn with needing that this field is subtracted one before this forwards, guarantees that with this kind each enhancement mode node waiting for that jumping figure separately initiates the process of setting up of regional route separately at synchronization after the time as much as possible.
Enhancement mode node (or leader cluster node) sends a kind of regional route of propagating with the mode of expanded ring to its region and sets up broadcast; The characteristics of this message are that each broadcasting waits for that sufficiently long atomic operation just carries out next step atomic operation (promptly sending route replies message to the enhancement mode node, to let enhancement mode node and path intermediate node be established to the route entry of present node direction) after blanking time afterwards.Wait for atomic operation blanking time once more, carry out then and regional route is set up broadcast be broadcast to next this atomic operation of hop neighbor node, by that analogy, set up process until the network area route and finish.
Algorithm of the present invention causes under the prerequisite of this shortcoming of lot of consumption avoiding the above-mentioned zone route to set up in the mode a large amount of broadcasts to network energy; A kind of atomic operation notion (Atomic Operation is proposed; Can think that it is an atomic operation that node sends packet at every turn); And, guaranteed the reasonability of each regional route through each regional route of network being set up the simultaneous operation of process enforcement expanded ring.
Method of the present invention improves synchronization accuracy through the time interval that increases regional route and set up between two continuous in process atomic operations; Each network area successively enlarges its regional route size with the mode of synchronous expanded ring; Each layer region route is all made its most reasonably Route Selection of thinking in expansion, the Path selection that each node layer is done after the expectation by this all is rational.This method for synchronous can reduce network is handled the time-delay aspect to node crystal oscillator deviation and data packet transceive requirement; Set up the time span of process and reduce route and set up expense through increasing regional route, and can guarantee that the regional route of setting up has reasonability preferably.
With respect to scheme of the prior art, advantage of the present invention is:
The invention provides in a kind of wireless network based on the synchronous regional method for routing foundation of expanded ring; Through being set up process, regional route is divided into a plurality of atomic operations; And between adjacent atom operation, insert certain time interval, guarantee that with this a plurality of regional routes set up the synchronization accuracy of process.This algorithm has reduced the quantity that broadcast packet is propagated in the network significantly in the rational while of regional route of not reducing foundation, and then reduces the energy expense that route is set up process.
Description of drawings
Below in conjunction with accompanying drawing and embodiment the present invention is further described:
Fig. 1 is the Wireless Network Applications scene sketch map of the embodiment of the invention;
Fig. 2 is the regional route synchronization message sketch map of the embodiment of the invention;
Fig. 3 is the regional route synchronization message transmitting-receiving process chart of the embodiment of the invention;
Fig. 4 is the atomic operation notion and the simultaneous operation sketch map of the embodiment of the invention;
Fig. 5 is that embodiment of the invention enhancement mode node synchronized broadcasting zone route is set up the message sketch map;
Fig. 6 is that embodiment of the invention sensing node is replied the response message sketch map synchronously to the enhancement mode node;
Fig. 7 is that embodiment of the invention sensing node is transmitted route synchronously and set up the control messages sketch map;
Fig. 8 is that expansion synchronously of embodiment of the invention zone route and sensing node are replied route replies message sketch map to the enhancement mode node synchronously;
Fig. 9 is embodiment of the invention sensing node is set up control messages to route a transmitting-receiving process chart.
Embodiment
Below in conjunction with specific embodiment such scheme is further specified.Should be understood that these embodiment are used to the present invention is described and are not limited to limit scope of the present invention.The implementation condition that adopts among the embodiment can be done further adjustment according to the condition of concrete producer, and not marked implementation condition is generally the condition in the normal experiment.
Embodiment
As shown in Figure 1, be provided with control centre, gateway node, the sensing node of being responsible for perceptional function and responsible sensing node in the wireless network of present embodiment and safeguard the enhancement mode node that is connected with route.May further comprise the steps based on the synchronous regional method for routing foundation of expanded ring in the wireless network:
(1) control centre sends LARES Synchronization Control message to gateway node, said gateway node with LARES Synchronization Control message to the enhancement mode node broadcasts;
(2) after the enhancement mode node receives LARES Synchronization Control message, read LARES Synchronization Control message and obtain to wait for the jumping figure temporal information;
(3) after the enhancement mode node was waited for the wait jumping figure time of LARES Synchronization Control message, sensing node was broadcasted the LARE control messages in its region, and set up the regional route of its region synchronously through expanded ring.
Introduce in network at first that regional route is set up control messages LARE (Local Area Route Establish) and regional route is set up Synchronization Control message LARES (Local Area Route Establish Synchronization).LARE message is used for the foundation of certain enhancement mode node peripheral region route of network; The LARES synchronization message is used for network gateway node the enhancement mode node is carried out synchronously; Make all enhancement mode nodes in the network set up process (promptly sending the process of LARE broadcast) in the regional route that synchronization is initiated separately as far as possible, guarantee that route sets up process and carry out synchronously.
The working mechanism of LARES synchronization message is as shown in Figure 2:
After the WSN network is laid well; The network control center sends LARES Synchronization Control message to gateway node; Comprise in this message and wait for jumping figure time field; Expression receives that the enhancement mode node of this message need wait for the needed time of jumping figure that this field of this message propagation is indicated, could control the foundation of this zone route to its neighbours' sensing node broadcasting LARE message then.It is that mode with discreet value is stored in the middle of each enhancement mode node that the needed time is jumped in the every propagation of LARES message one.The wait hop count field that presets among Fig. 2 is 8, before the each forwarding of later enhancement mode node, all can this field be subtracted 1, and like this, each enhancement mode node just can be close to the identical moment initiation process of setting up of regional route separately.The enhancement mode node is as shown in Figure 3 to the transmitting-receiving flow chart of LARES message.
LARE zone route is set up control messages working mechanism:
Each enhancement mode node is waited for the regular hour according to the wait jumping figure time field of LARES message, just can initiate LARE broadcasting to its region then, and set up regional route.The process of setting up of zone route uses expanded ring to carry out synchronously; Each node is sent or transmit the LARE control messages regard atomic operation as one time, sensing node is replied RREP message select its regional enhancement mode node whole operation process of adding to be regarded as atomic operation one time to this node.Whenever carry out after atomic operation, each node will wait for that all the atomic operation of a regular length just can carry out next step and be derived from operation blanking time.As shown in Figure 4 about atomic operation and the synchronous sketch map of mulitpath atomic operation; 7 that have indicated among the figure on 4 paths are derived from operation; Therefore the overlapping on the time of origin not between preceding 5 atomic operations are adjacent is thought synchronously, and atomic operation afterwards then is a step-out; Because when back one goes on foot the atomic operation generation, the not completion synchronously of a last step atomic operation.For regional route was set up process, the atomic operation of step-out possibly cause sensing node to make judgement of irrational path and selection, so should avoid the generation of atomic operation step-out in the network as much as possible.Can find out that by Fig. 4 along with the increase of atomic operation number of times, its out of alignment time can accumulate; But through increasing the atomic operation time interval, can reduce the shared proportion of this out of alignment time, and then reduce the influence of step-out; Increase continuous atomic operation synchronism; Therefore, the atomic operation time interval should be in the scope of allowing long enough, to satisfy synchronous requirement.
The setting in the atomic operation time interval should be satisfied following condition: when packet was propagated in the longest path in network, the atomic operation cumulative time error of its maximum possible should be less than the atomic operation time interval.For example, it is the longest for N jumps to suppose in the network that certain sensing node arrives apart from its nearest enhancement mode node path, and packet is every when jumping through one, and the delay time error of maximum is T, and then Interval should satisfy the atomic operation time interval:
Interval>=3*N*T。
Coefficient 3 is to consider that node also might find routing error (though probability is extremely low) in the enhancement mode node sends the process of RREP response message; Add the sensing node of regional route for application this error notification then; Sensing node is reselected new enhancement mode node or new path and is sent the RREP response message, and this process needs the time of 3 times N*T at least.When T is 50ms, N is 20 o'clock, and Interval should be made as 3s at least, and the process time set up of path is at least T like this
Establish>N*Interval=1min.
Fig. 5 ~ 8 are depicted as regional route and set up each atomic operation sketch map of process.All enhancement mode nodes are synchronous, and to send LARE control messages atomic operation sketch map to neighbours' sensing node separately as shown in Figure 5; Neighbor node is selected only zone according to one or more LARE message of receiving; And wait for that atomic operation sends RREP to this zone enhancement mode node direction after blanking time and replys message (as shown in Figure 6), so that the enhancement mode node updates is to this sensing node direction route.The enhancement mode node carries out according to following steps the transmitting-receiving process of LARES Synchronization Control message:
A) after the enhancement mode node is received LARES Synchronization Control message, judge whether to handle for the first time LARES Synchronization Control message; When for the first time locating LARES Synchronization Control message, the route entry that provides the path to create gateway node by LARES Synchronization Control message, C set by step) carry out, otherwise judge whether the path that LARES Synchronization Control message provides is nearer;
When B) path that provides of LARES Synchronization Control message is nearer, the new route direction and the jumping figure information updating gateway node route entry that provide according to LARES Synchronization Control message, otherwise ending method;
C) upgrade jumping figure, LARE stand-by period and the energy indication field of LARES Synchronization Control message, with the LARES Synchronization Control information broadcast after upgrading to next hop neighbor node; Open LARE then and send LARE broadcast messages to be sent such as waiting timer.
Fig. 7 representes that each zone boundary node transmits LARE message atomic operation sketch map synchronously; Same; The node of receiving the LARE message of forwarding can wait for atomic operation after blanking time to selecting suitable zone and send RREP to this zone and reply message, regional route is expanded (as shown in Figure 8) synchronously.Be illustrated in figure 9 as processing of LARE information receiving and transmitting and regional route and set up flow chart.Sensing node carries out according to following steps the transmitting-receiving step process of LARE control messages:
A) sensing node is received the LARE control messages that the enhancement mode node is set up, and creates the route entry of enhancement mode node direction, opens the RREP transmission timer and waits for atomic operation blanking time;
B) the RREP transmission timer is received from all after overtime and is selected the more excellent node of energy the enhancement mode node of its LARE control messages, sends RREP message, opens the RREP transmission timer and waits for atomic operation blanking time;
C) sensing node judges whether the overtime RREP message before of RREP transmission timer sends success; When sending successfully, receive the suitable zone of selection its LARE control messages from all after the LARE transmission timer is overtime, and send RREP message to this regional enhancement mode node; Otherwise reselect the enhancement mode node, and send RREP message to it.
Above-mentioned instance only is explanation technical conceive of the present invention and characteristics, and its purpose is to let the people who is familiar with this technology can understand content of the present invention and enforcement according to this, can not limit protection scope of the present invention with this.All equivalent transformations that spirit is done according to the present invention or modification all should be encompassed within protection scope of the present invention.
Claims (5)
1. a wireless network is interior based on the synchronous regional method for routing foundation of expanded ring, is provided with control centre, gateway node, the sensing node of being responsible for perceptional function and responsible sensing node in the said wireless network and safeguards the enhancement mode node that is connected with route; It is characterized in that said method comprising the steps of:
(1) control centre sends LARES Synchronization Control message to gateway node, said gateway node with LARES Synchronization Control message to the enhancement mode node broadcasts;
(2) after the enhancement mode node receives LARES Synchronization Control message, read LARES Synchronization Control message and obtain to wait for the jumping figure temporal information;
(3) after the enhancement mode node was waited for the wait jumping figure time of LARES Synchronization Control message, sensing node was broadcasted the LARE control messages in its region, and set up the regional route of its region synchronously through expanded ring.
2. method according to claim 1; It is characterized in that in the said method step (3) replying RREP message to node and select to add the enhancement mode node and be regarded as atomic operation, and atomic operation is set behind atomic operation at every turn carries out Synchronous Processing blanking time sending or transmit LARE control messages and sensing node between the node.
3. method according to claim 1; When it is characterized in that in the said method step (3) that the setting in the atomic operation time interval is satisfied packet and in network, propagated in the longest path, the atomic operation cumulative time error of its maximum possible is less than the atomic operation time interval.
4. method according to claim 1 is characterized in that enhancement mode node in the said method may further comprise the steps the transmitting-receiving of LARES Synchronization Control message:
A) after the enhancement mode node is received LARES Synchronization Control message, judge whether to handle for the first time LARES Synchronization Control message; When for the first time handling LARES Synchronization Control message, the route entry that provides the path to create gateway node by LARES Synchronization Control message, C set by step) carry out, otherwise judge whether the path that LARES Synchronization Control message provides is nearer;
When B) path that provides of LARES Synchronization Control message is nearer, the new route direction and jumping figure information updating gateway node route entry, the C set by step that provide according to LARES Synchronization Control message) carry out, otherwise ending method;
C) upgrade jumping figure, LARE stand-by period and the energy indication field of LARES Synchronization Control message, with the LARES Synchronization Control information broadcast after upgrading to next hop neighbor node; Open LARE then and send LARE broadcast messages to be sent such as waiting timer.
5. method according to claim 1 is characterized in that sensing node in the said method may further comprise the steps the transmitting-receiving of LARE control messages:
A) sensing node is received the LARE control messages that the enhancement mode node is set up, and creates the route entry of enhancement mode node direction, opens the RREP transmission timer and waits for atomic operation blanking time;
B) the RREP transmission timer is received from all after overtime and is selected the more excellent node of energy the enhancement mode node of its LARE control messages, sends RREP message, opens the RREP transmission timer and waits for atomic operation blanking time;
C) sensing node judges whether the overtime RREP message before of RREP transmission timer sends success; When sending successfully, receive the suitable zone of selection its LARE control messages from all after the LARE transmission timer is overtime, and send RREP message to this regional enhancement mode node; Otherwise reselect the enhancement mode node, and send RREP message to it.
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| CN101183486A (en) * | 2007-12-05 | 2008-05-21 | 浙江林学院 | Reliability design method for wireless data acquisition of timber drying process |
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| US20060002368A1 (en) * | 2004-07-01 | 2006-01-05 | Honeywell International Inc. | Latency controlled redundant routing |
| CN101183486A (en) * | 2007-12-05 | 2008-05-21 | 浙江林学院 | Reliability design method for wireless data acquisition of timber drying process |
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