CN103516504A - Network node clock synchronization method, nodes and system - Google Patents
Network node clock synchronization method, nodes and system Download PDFInfo
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- CN103516504A CN103516504A CN201210369823.2A CN201210369823A CN103516504A CN 103516504 A CN103516504 A CN 103516504A CN 201210369823 A CN201210369823 A CN 201210369823A CN 103516504 A CN103516504 A CN 103516504A
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Abstract
The invention discloses a network node clock synchronization method which includes the first step that a second node receives a beacon sent by a first node and time t1 when the first node sends the beacon, and obtains time t2 when the second node receives the beacon; the second step that the local time of the second node is adjusted according to the time difference delta t1 between the t1 and the t2 to enable the second node and the first node to achieve clock synchronization; and the third step that after the local time of the second node is adjusted, the second node sends the beacon to a third node and time t3 when the second node sends the beacon, so that the local time of the third node is adjusted, and the clock synchronization can be achieved between the third node, the second node and the first node. According to the network node clock synchronization method, the beacon and the beacon sending time are transmitted between the nodes, the clock synchronization between the nodes is achieved, the clock synchronization problem of a wireless self-organized network is solved easily and effectively, no extra synchronization equipment is added, and the cost is low.
Description
Technical field
The present invention relates to communication technical field, particularly relate to a kind of network node clock synchronizing method and node, system.
Background technology
At present, clock synchronous obtains NTP (Network Time Protocol) (NTP, Network Time Protocol) in a large amount of uses, particularly the Internet in network technology, and precision is high, robustness and expandability good, its time synchronizing function is extensively admitted.But Network Time Protocol has its limitation, first, application Network Time Protocol must have the wire transmission network of good transmission environment; Secondly, Network Time Protocol is in time error check and correction process, need to frequently carry out message, and eliminate the non-definite factor in communication by complicated time correction algorithm, not consider the factors such as network time complexity, space resources consumption and node capacity.Limitation due to Network Time Protocol, when Network Time Protocol technology is applied to information gathering network, the applied environment of information gathering network complexity (as link failure probability frequently occurs) cannot guarantee the robustness of transmission link, and Network Time Protocol technology has increased the construction cost of information gathering network greatly.Therefore, how the simple and effective clock synchronous of realizing ad hoc deployed wireless networks is a problem demanding prompt solution.
Summary of the invention
The embodiment of the present invention provides a kind of network node clock synchronizing method and node, system.In the embodiment of the present invention, Section Point, according to receiving the time of beacon and the time that first node sends beacon, is adjusted local zone time, makes Section Point and first node clock synchronous.After Section Point is adjusted local zone time, Section Point also sends the time of beacon and Section Point transmission beacon to the 3rd node, make the 3rd node according to receiving the time of beacon and the time that Section Point sends beacon, adjust local zone time, make the 3rd node and Section Point, first node clock synchronous.Therefore, the present invention is in realizing internodal clock synchronous process, and the amount of information of transmitting between node is few, and without carrying out repeatedly information interaction, clock synchronous process is simple, and without relying on extra synchronizer, cost is low.
It is pointed out that the present invention is applicable to being applied to information gathering network, before image data, can simple and effectively carry out internodal clock synchronous, effectively reduce the acquisition cost of data.
A clock synchronizing method, comprising:
Section Point receives the beacon of first node transmission and the time t that described first node sends described beacon
1, obtain the time t that described Section Point receives described beacon
2;
Described Section Point is according to described t
1with described t
2time difference Δ t
1, adjust the local zone time of described Section Point, make the clock synchronous of described Section Point and described first node;
After adjusting the local zone time of described Section Point, described Section Point sends to the 3rd node the time t that described beacon and described Section Point send described beacon
3, so that described the 3rd node receives described beacon and the described t that Section Point sends
3, obtain the time t that described the 3rd node receives described beacon
4, according to described t
3with described t
4time difference, adjust the local zone time of described the 3rd node, make the clock synchronous of described the 3rd node and described Section Point and described first node.
Optionally, described Section Point is according to described t
1with described t
2time difference Δ t
1, the step of adjusting the local zone time of described Section Point comprises: more described t
2with described t
1if, described t
2be later than described t
1, the local zone time of described Section Point is shifted to an earlier date to Δ t
1time.
Optionally, described Section Point is according to described t
1with described t
2time difference Δ t
1, the step of adjusting the local zone time of described Section Point comprises: more described t
2with described t
1if, described t
2early than described t
1, the local zone time of described Section Point is postponed to Δ t
1time.
Optionally, lower floor's network node that described Section Point is described first node or with layer network node, lower floor's network node that described the 3rd node is described Section Point or with layer network node.
Optionally, described first node and described Section Point are adjacent node, and described Section Point and described the 3rd node are adjacent node.
, comprising:
Receiving element, for receiving the beacon of first node transmission and the time t that described first node sends described beacon
1, obtain the time t that described Section Point receives described beacon
2;
Adjustment unit, for according to described t
1with described t
2time difference Δ t
1, adjust the local zone time of described Section Point, make the clock synchronous of described Section Point and described first node;
Transmitting element, after adjusting the local zone time of described Section Point at adjustment unit, sends to described the 3rd node the time t that described beacon and described Section Point send described beacon
3, so that described the 3rd node receives described beacon and described t
3, obtain the time t that described the 3rd node receives described beacon
4, according to described t
3with described t
4time difference, adjust the local zone time of described the 3rd node, make the clock synchronous of described the 3rd node and described Section Point and described first node.
Optionally, described adjustment unit is also for more described t
1with described t
2if, described t
2be later than described t
1, the local zone time of described Section Point is shifted to an earlier date to Δ t
1time.
Optionally, described adjustment unit is also for more described t
1with described t
2if, described t
2early than described t
1, the local zone time of described Section Point is postponed to Δ t
1time.
, comprising:
Generation unit, for generating beacon;
Transmitting element, for sending the beacon of described generation unit generation and the transmitting time of described beacon to described Section Point.
, comprising:
First node, for sending beacon and sending the time t of described beacon to Section Point to Section Point
1;
Section Point, the described beacon and the described t that for receiving first node, send
1, obtain the time t that described Section Point receives described beacon
2, also for according to described t
1with described t
2time difference, adjust the local zone time of described Section Point, make the clock synchronous of described Section Point and described first node, also for after adjusting the local zone time of described Section Point, to the 3rd node, send the time t that described beacon and described Section Point send described beacon
3;
The 3rd node, the described beacon and the described t that for receiving described Section Point, send
3, obtain the time t that described the 3rd node receives described beacon
4, according to described t
3with described t
4time difference, adjust the local zone time of described the 3rd node, make the clock synchronous of described the 3rd node and described Section Point and described first node.
The embodiment of the present invention, by transmitting the transmitting time of beacon and beacon between node, realizes internodal clock synchronous, the simple and effective clock synchronization issue that solves wireless self-organization network not only, and do not increase extra synchronizer, cost is low.
Accompanying drawing explanation
Fig. 1 is the schematic flow sheet of 1 one kinds of network node clock synchronizing methods of embodiment;
Fig. 2 is the schematic flow sheet of 2 one kinds of network node clock synchronizing methods of embodiment;
Fig. 3 is 3 one kinds of Section Point cellular construction schematic diagrames of embodiment;
Fig. 4 is 4 one kinds of Section Point cellular construction schematic diagrames of embodiment;
Fig. 5 is 5 one kinds of first node cellular construction schematic diagrames of embodiment;
Fig. 6 is a kind of network system cellular construction schematic diagram of embodiment 6.
Embodiment
Below enumerate embodiment, and the present invention is described in detail by reference to the accompanying drawings.
Embodiment 1
As shown in Figure 1, a kind of network node clock synchronizing method, comprising:
101, Section Point receives the beacon of first node transmission and the time t that described first node sends described beacon
1, obtain the time t that described Section Point receives described beacon
2.
102, described Section Point is according to described t
1with described t
2, adjust the local zone time of described Section Point, make the clock synchronous of described Section Point and described first node.
Described t
1for first node sends the time of beacon to described Section Point, belong to the local zone time of first node, described t
2for Section Point receives the beacon time that described first node sends, belong to the local zone time of Section Point.Therefore, described t
2with described t
1between time difference be time difference of the local zone time of first node and Section Point.
103,, after adjusting the local zone time of described Section Point, described Section Point sends to the 3rd node the time t that described beacon and described Section Point send described beacon
3, so that described the 3rd node receives described beacon and the t that Section Point sends
3, obtain the time t that described the 3rd node receives described beacon
4, according to described t
3with described t
4time difference, adjust the local zone time of described the 3rd node, make the clock synchronous of described the 3rd node and described Section Point and described first node.
After adjusting the local zone time of described Section Point, the local zone time of described Section Point is synchronizeed with the local zone time of described first node.Now, described Section Point sends described beacon and described t to the 3rd node
3, so that described the 3rd node is receiving described beacon and described t
3after, adjust local zone time.The 3rd node, after adjusting local zone time, is synchronizeed with the local zone time of described Section Point, also synchronizes with the local zone time of described first node.
In the present embodiment, described first node, described Section Point and described the 3rd node can be the node of self-organizing network, as honeycomb (Zigbee) network node.The present embodiment method can be applied to the wireless self-organization networks such as Zigbee, is especially applicable to being applied to the self-organizing network for wireless information collection.In the time need to carrying out the data information acquisition of each node, can adopt the present embodiment method to carry out internodal time synchronized, then carry out data acquisition, effective guarantee the transmission of data between node.
Embodiment 2
As shown in Figure 2, a kind of network node clock synchronizing method, comprising:
201, Section Point receives the beacon of first node transmission and the time t that described first node sends described beacon
1, obtain the time t that described Section Point receives described beacon
2.
202, the more described t of described Section Point
1with described t
2if, described t
2be later than described t
1, the local zone time of described Section Point is shifted to an earlier date to Δ t
1time, Δ t
1for described t
1with described t
2time difference, make the clock synchronous of described Section Point and described first node.
203, the more described t of described Section Point
1with described t
2if, described t
2early than described t
1, the local zone time of described Section Point is postponed to Δ t
1time, make the clock synchronous of described Section Point and described first node.
Described t
1for first node sends the time of beacon to described Section Point, belong to the local zone time of first node.Described t
2for Section Point receives the beacon time that described first node sends, belong to the local zone time of Section Point.Therefore, described t
2with described t
1between time difference be time difference of the local zone time of first node and Section Point.As described t
2be later than described t
1time, the local zone time of described Section Point is later than the local zone time of described first node, and described Section Point should shift to an earlier date Δ t
1time, make the clock synchronous of described Section Point and described first node.As described t
2early than described t
1time, the local zone time of described Section Point is early than the local zone time of described first node, and described Section Point should postpone Δ t
1time, make the clock synchronous of described Section Point and described first node.
204,, after adjusting the local zone time of described Section Point, described Section Point sends to the 3rd node the time t that described beacon and described Section Point send described beacon
3, so that described the 3rd node receives described beacon and the described t that Section Point sends
3, obtain the time t that described the 3rd node receives described beacon
4, according to described t
3with described t
4time difference, adjust the local zone time of described the 3rd node, make the clock synchronous of described the 3rd node and described Section Point and described first node.
The mode of the 3rd knot adjustment local zone time can to adjust the mode of local zone time identical with Section Point, can refer step 202 and 203.
After adjusting the local zone time of described Section Point, the local zone time of described Section Point is synchronizeed with the local zone time of described first node.Now, described Section Point sends described beacon and described t to the 3rd node
3, so that described the 3rd node is receiving described beacon and described t
3after, adjust local zone time.The 3rd node, after adjusting local zone time, is synchronizeed with the local zone time of described Section Point, also synchronizes with the local zone time of described first node.
Optionally, lower floor's network node that described Section Point is described first node or with layer network node, lower floor's network node that described the 3rd node is described Section Point or with layer network node.
Optionally, described first node and described Section Point are adjacent node, and described Section Point and described the 3rd node are adjacent node.
Embodiment of the present invention method can be applied to change at many levels the network of structure.Before carrying out clock synchronous, network management center's node reads the whole network and is related to matrix table, calculates the hierarchical layout of the whole network child node, then according to the level less principle of minor node time slot more, gives each byte point distribution of the whole network unique time slot.After completing the time slot allocation of node, network management center's node can send the transmitting time of beacon and this beacon, the ground floor network node adjacent with network management center node receives beacon and transmitting time, according to the time and this transmitting time that receive beacon, adjust the local zone time of ground floor network node, make the clock synchronous of Qi Yu network management center node.Ground floor network node after the adjustment time again adjacent node of Xiang Tongcenghuo lower floor network forwards beacon, and this adjacent node is adjusted local zone time, makes the clock synchronous of Qi Yu network management center node.Beacon can be passed to fringe node step by step by adjacent node, makes node on network and the clock synchronous of Centroid.Adopt the embodiment of the present invention, network management center's node can send beacon in irregular mode, thereby realizes the synchronous of network time.
Embodiment 3
As shown in Figure 3, a kind of Section Point, comprising:
Receiving element 301, for receiving the beacon of first node transmission and the time t that described first node sends described beacon
1, obtain the time t that described Section Point receives described beacon
2;
Transmitting element 303, for after adjustment unit 302 is adjusted the local zone time of described Section Point, sends to described the 3rd node the time t that described beacon and described Section Point send described beacon
3, so that described the 3rd node receives described beacon and t
3, obtain the time t that described the 3rd node receives described beacon
4, according to described t
3with described t
4time difference, adjust the local zone time of described the 3rd node, make the clock synchronous of described the 3rd node and described Section Point and described first node.
Receiving element 301 is obtaining described t
1with described t
2afterwards, by described t
1with described t
2be transferred to adjustment unit 302, adjustment unit 302 receives the described t of described receiving element 301 transmission
1with described t
2, according to described t
1with described t
2time difference, the local zone time of described Section Point is adjusted to consistent with described first node, and after adjusting local zone time, transmitting element 303 sends described beacon and described t to the 3rd node
3, for the 3rd knot adjustment local zone time.
Embodiment 4
As described in Figure 4, a kind of Section Point, comprising:
Receiving element 401, for receiving the beacon of first node transmission and the time t that described first node sends described beacon
1, obtain the time t that described Section Point receives described beacon
2.
Transmitting element 403, for after adjustment unit 402 is adjusted the local zone time of described Section Point, sends to described the 3rd node the time t that described beacon and described Section Point send described beacon
3, so that described the 3rd node receives described beacon and described t
3, obtain the time t that described the 3rd node receives described beacon
4, according to described t
3with described t
4time difference, adjust the local zone time of described the 3rd node, make the clock synchronous of described the 3rd node and described Section Point and described first node.
Receiving element 401 is obtaining described t
1with described t
2afterwards, by described t
1with described t
2be transferred to adjustment unit 402, adjustment unit 402 receives the described t of described receiving element 401 transmission
1with described t
2, according to described t
1with described t
2time difference, as described t
2be later than described t
1time, the local zone time of described Section Point is postponed to Δ t
1time, make the clock synchronous of described Section Point and described first node, as described t
2early than described t
1time, the local zone time of described Section Point is postponed to Δ t
1time, make the clock synchronous of described Section Point and described first node.After described adjustment unit 402 is adjusted local zone time, transmitting element 403 sends described beacon and described t to the 3rd node
3, for the 3rd knot adjustment local zone time.Wherein, described first node and described Section Point can be adjacent node, and Section Point and described the 3rd node can be adjacent node.
Embodiment 5
As shown in Figure 5, a kind of first node, comprising:
Transmitting element 502, for sending the beacon of described generation unit 501 generations and the transmitting time of described beacon to described Section Point.
Embodiment 6
As shown in Figure 6, a kind of ad hoc network system, comprising:
The 3rd node 603, the described beacon and the described t that for receiving described Section Point 602, send
3, obtain the time t that described the 3rd node 603 receives described beacon
4, according to described t
3with described t
4time difference, adjust the local zone time of described the 3rd node 603, make the clock synchronous of described the 3rd node 603 and described Section Point 602 and described first node 601.
Optionally, described Section Point 602 can also be for more described t
1with described t
2if, described t
2be later than described t
1, the local zone time of described Section Point 602 is shifted to an earlier date to Δ t
1time, Δ t
1for described t
1with described t
2time difference, make the clock synchronous of described Section Point 602 and described first node 601; If described t
2early than described t
1, the local zone time of described Section Point 602 is postponed to Δ t
1time, make the clock synchronous of described Section Point 602 and described first node 601.
Optionally, described the 3rd node 603 can also be for more described t
3with described t
4if, described t
4be later than described t
3, the local zone time of described the 3rd node 603 is shifted to an earlier date to Δ t
2time, Δ t
2for described t
3with described t
4time difference, make the clock synchronous of described the 3rd node 603 and described Section Point 602, also with the clock synchronous of described first node 601; If described t
4early than described t
3, the local zone time of described the 3rd node 603 is postponed to Δ t
2time, make the clock synchronous of described the 3rd node 603 and described Section Point 602, also with the clock synchronous of described first node 601.
This ad hoc network system can be for information gathering, and as the radio meter register network as long-range water meter, ammeter, it is not increasing additional synchronization equipment, meets under requirement cheaply, efficiently solves the clock synchronization issue of the network node of checking meter.
A kind of network node the clock synchronizing method above embodiment of the present invention being provided and node, network system are described in detail, applied specific case herein principle of the present invention and execution mode are set forth, the explanation of above embodiment is just for helping to understand method of the present invention and core concept thereof; , for one of ordinary skill in the art, according to thought of the present invention, all will change in specific embodiments and applications, in sum, this description should not be construed as limitation of the present invention meanwhile.
Claims (10)
1. a network node clock synchronizing method, is characterized in that, comprising:
Section Point receives the beacon of first node transmission and the time t that described first node sends described beacon
1, obtain the time t that described Section Point receives described beacon
2;
Described Section Point is according to described t
1with described t
2time difference Δ t
1, adjust the local zone time of described Section Point, make the clock synchronous of described Section Point and described first node;
After adjusting the local zone time of described Section Point, described Section Point sends to the 3rd node the time t that described beacon and described Section Point send described beacon
3, so that described the 3rd node receives described beacon and the described t that Section Point sends
3, obtain the time t that described the 3rd node receives described beacon
4, according to described t
3with described t
4time difference, adjust the local zone time of described the 3rd node, make the clock synchronous of described the 3rd node and described Section Point and described first node.
2. network node clock synchronizing method according to claim 1, is characterized in that, described Section Point is according to described t
1with described t
2time difference Δ t
1, the step of adjusting the local zone time of described Section Point comprises: more described t
2with described t
1if, described t
2be later than described t
1, the local zone time of described Section Point is shifted to an earlier date to Δ t
1time.
3. network node clock synchronizing method according to claim 1, is characterized in that, described Section Point is according to described t
1with described t
2time difference Δ t
1, the step of adjusting the local zone time of described Section Point comprises: more described t
2with described t
1if, described t
2early than described t
1, the local zone time of described Section Point is postponed to Δ t
1time.
4. according to the network node clock synchronizing method described in claim 1,2 or 3, it is characterized in that, described Section Point is lower floor's network node of described first node or with layer network node, lower floor's network node that described the 3rd node is described Section Point or with layer network node.
5. network node clock synchronizing method according to claim 4, is characterized in that,
Described first node and described Section Point are adjacent node, and described Section Point and described the 3rd node are adjacent node.
6. a Section Point, is characterized in that, comprising:
Receiving element, for receiving the beacon of first node transmission and the time t that described first node sends described beacon
1, obtain the time t that described Section Point receives described beacon
2;
Adjustment unit, for according to described t
1with described t
2time difference Δ t
1, adjust the local zone time of described Section Point, make the clock synchronous of described Section Point and described first node;
Transmitting element, after adjusting the local zone time of described Section Point at adjustment unit, sends to described the 3rd node the time t that described beacon and described Section Point send described beacon
3, so that described the 3rd node receives described beacon and described t
3, obtain the time t that described the 3rd node receives described beacon
4, according to described t
3with described t
4time difference, adjust the local zone time of described the 3rd node, make the clock synchronous of described the 3rd node and described Section Point and described first node.
7. Section Point according to claim 6, is characterized in that,
Described adjustment unit is also for more described t
1with described t
2if, described t
2be later than described t
1, the local zone time of described Section Point is shifted to an earlier date to Δ t
1time.
8. Section Point according to claim 7, is characterized in that,
Described adjustment unit is also for more described t
1with described t
2if, described t
2early than described t
1, the local zone time of described Section Point is postponed to Δ t
1time.
9. a first node, is characterized in that, comprising:
Generation unit, for generating beacon;
Transmitting element, for sending the beacon of described generation unit generation and the transmitting time of described beacon to described Section Point.
10. an ad hoc network system, is characterized in that, comprising:
First node, for sending beacon and sending the time t of described beacon to Section Point to Section Point
1;
Section Point, the described beacon and the described t that for receiving first node, send
1, obtain the time t that described Section Point receives described beacon
2, also for according to described t
1with described t
2time difference, adjust the local zone time of described Section Point, make the clock synchronous of described Section Point and described first node, also for after adjusting the local zone time of described Section Point, to the 3rd node, send the time t that described beacon and described Section Point send described beacon
3;
The 3rd node, the described beacon and the described t that for receiving described Section Point, send
3, obtain the time t that described the 3rd node receives described beacon
4, according to described t
3with described t
4time difference, adjust the local zone time of described the 3rd node, make the clock synchronous of described the 3rd node and described Section Point and described first node.
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