CN107155213A - Synchronous method, node apparatus and Wireless MESH network system - Google Patents
Synchronous method, node apparatus and Wireless MESH network system Download PDFInfo
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- CN107155213A CN107155213A CN201710128739.4A CN201710128739A CN107155213A CN 107155213 A CN107155213 A CN 107155213A CN 201710128739 A CN201710128739 A CN 201710128739A CN 107155213 A CN107155213 A CN 107155213A
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W56/00—Synchronisation arrangements
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W56/00—Synchronisation arrangements
- H04W56/001—Synchronization between nodes
- H04W56/0015—Synchronization between nodes one node acting as a reference for the others
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Abstract
The application is related to the synchronous method and node apparatus for Wireless MESH network and the Wireless MESH network system including the node apparatus.The method according to the invention, the synchronizing signal broadcasted from nodal test host node is locally obtaining frame boundaries, and send access signal to the host node.At least one is from the access signal of node transmission, the corresponding Delay of estimation described in the host node detection and broadcasts the Delay.The Delay issued from host node described in nodal test.If described from nodal test to the Delay, the frame boundaries are adjusted according to the Delay, so as to realize synchronous with the host node.The technical scheme of the application can lift the net synchronization capability of MESH network node.
Description
Technical field
The application is related to Wireless MESH network field, specifically, synchronous method and node for Wireless MESH network
Device and the Wireless MESH network system including the node apparatus.
Background technology
Wireless MESH network（Wireless mesh network）Also referred to as " multi-hop（multi-hop）" network.Wireless MESH network
Core guiding theory is that signal can be launched and be received to each node allowed in network, and any wireless device node can be same
Signal can be launched and be received to each node in Shi Zuowei AP and router, network, each node can with one or
The multiple peer nodes of person carry out direct communication.The development of Wireless MESH network be in it is in the ascendant among, industry is proposed
With the various schemes of development.In this application, MESH network can understand in a broad sense.
Wireless MESH network is divided into asynchronous network and synchronizing network.When network density and it is larger when, it is synchronous
MESH network has more preferable network performance in actual applications.In synchronous MESH network, it is desirable to which the frame boundaries on node are same
Step.In the case where there is the external synchronization sources such as GPS/ Big Dippeves auxiliary, the whole network is synchronously relatively easy to realize, and synchronization accuracy also compares
It is higher.But under many scenes, such as when underground, jungle, satellite-signal is not covered or signal quality is bad,
The net synchronization capability of system will be had a strong impact on.
Existing conventional simultaneous techniques includes beacon synchronization technology, i.e., in the case where not using external synchronization clock source,
Timestamp is only stamped between network node in special packet switch, the local time difference between superior node is calculated, with this
Reach synchronization.The beacon synchronization technology of existing comparative maturity has：
NTP (Network Time Protocol) technology：It is mainly used in needing synchronous network node in internet, is a kind of
Software synchronization technology.
The technologies of IEEE 1588：Cardinal principle be by synchronous signal cycle in network all nodes when
Clock is synchronized, and is to realize that the master clock of the network equipment is synchronous by way of software and hardware combining.
Both the above technology is generally used for wire communication, some Wireless MESH networks can also be borrowed when synchronous the above this
Two kinds of technologies.No matter which kind of technology, is typically all stabbed using software time, i.e., insert synchronous letter in sending or receiving message
Breath, but be due to, when sending or receiving message, to be processed the shadow of the factors such as device processing speed, operating system working method
Ring, soft timestamp has certain error with actual transmission or reception time, has a strong impact on synchronization accuracy.
When being synchronized among the nodes by sending synchronizing signal, network typically can determine whether a host node.Host node
Synchronizing signal is sent, synchronizing signal is received from node, and local frame boundaries are determined according to synchronizing signal, is realized and host node
It is synchronous.But, it is different to the propagation delay time from node due to the synchronizing signal on host node, therefore from the frame boundaries on node still
So have deviation, it is impossible to the high-precise synchronization between each node of strict guarantee.
Therefore, still need to improve the synchronization of Wireless MESH network.
Above- mentioned information is only used for strengthening the understanding of the background to the present invention, therefore it disclosed in the background section
It can include not constituting the information to prior art known to persons of ordinary skill in the art.
The content of the invention
A kind of synchronous method and node apparatus for Wireless MESH network of disclosure, can lift MESH network section
The net synchronization capability of point.
Other characteristics and advantage of the present invention will be apparent from by following detailed description, or partially by the present invention
Practice and acquistion.
According to an aspect of the present invention there is provided a kind of synchronous method for Wireless MESH network, including：
The synchronizing signal broadcasted from nodal test host node, is locally obtaining frame boundaries；
It is described that access signal is sent from node to the host node；
The Delay issued from host node described in nodal test；
If described from nodal test to the Delay, the frame boundaries are adjusted according to the Delay, so that real
It is now synchronous with the host node.
According to an embodiment, the access signal that sent from node to the host node includes：It is described from node according to institute
State frame boundaries and send access signal to the host node.
According to an embodiment, the Delay issued from host node described in nodal test includes：It is described to exist from node
After sending the access to the host node, continue listening broadcast channel, detection sends the access time-frequency of the access signal
Whether Delay that the host node issue is had in resource.
According to another aspect of the present invention there is provided a kind of synchronous method for Wireless MESH network, including：
Host node broadcast synchronization signal；
The access signal that at least one sends from node described in the host node detection；
The host node estimates corresponding Delay according to the access signal detected；
The host node broadcasts the Delay.
According to an embodiment, preceding method also includes：The host node set for it is described at least one accessed from node
At least one running time-frequency resource, at least one described running time-frequency resource respectively have respective running time-frequency resource ID.
According to an embodiment, at least one described access signal sent from node of the host node detection includes：It is described
Host node travels through at least one described running time-frequency resource to detect access signal.
According to an embodiment, the host node, which broadcasts the Delay, to be included：The host node broadcasts the time delay letter
Breath and the corresponding running time-frequency resource ID.
According to an embodiment, the host node estimates that corresponding Delay includes according to the access signal detected：Institute
Host node is stated on the basis of its local frame boundaries, corresponding Delay is estimated.
According to another aspect of the present invention there is provided a kind of node apparatus for Wireless MESH network, including：
Synchronization signal detection module, for detecting the synchronizing signal that host node is sent, is locally obtaining frame boundaries；
Signal transmitting module is accessed, for sending access signal to the host node；
Delay detection module, for detecting the Delay that the host node is issued；
Synchronization module, for when the Delay detection module detects the Delay, according to the Delay
The frame boundaries are adjusted, so as to realize that the node apparatus is synchronous with the host node.
According to an embodiment, the access signal transmitting module is configured to send to the host node according to the frame boundaries
Access signal.
According to an embodiment, the Delay detection module is configured to：In the access signal transmitting module to described
Host node is sent after the access, continues listening broadcast channel, and detection is sent on the access running time-frequency resource of the access signal
Whether Delay that the host node issue is had.
According to another aspect of the present invention there is provided a kind of node apparatus for Wireless MESH network, including：
Synchronizing signal sending module, for broadcast synchronization signal；
Signal detection module is accessed, for detecting at least one described access signal for being sent from node；
Time delay estimation module, the access signal for being detected according to delay time signal detection module estimates corresponding Delay；
Delay sending module, for broadcasting the Delay.
According to an embodiment, aforementioned nodes device also includes running time-frequency resource module, for set be used for it is described at least one
At least one running time-frequency resource accessed from node, at least one described running time-frequency resource has respective running time-frequency resource ID respectively.
According to an embodiment, the access signal detection module is configured to：At least one described running time-frequency resource is traveled through to examine
Survey access signal.
According to an embodiment, when the Delay sending module is configured to broadcast the Delay and be corresponding described
Frequency resource ID.
According to an embodiment, time delay estimation module is configured to：On the basis of local frame boundaries, mould is detected according to delay time signal
The access signal that block is detected, estimates corresponding Delay.
There is provided a kind of Wireless MESH network system, including aforementioned nodes device according to another aspect of the present invention.
There is provided a kind of node apparatus for Wireless MESH network according to another aspect of the present invention, it is characterised in that bag
Include：
Transmitter；
Receiver；
Processor；
Memory, stores the instruction that following operation is completed for the processor：
The synchronizing signal that host node is sent is detected, frame boundaries are locally being obtained；
Access signal is sent to the host node；
Detect the Delay that the host node is issued；
When detecting the Delay, the frame boundaries are adjusted according to the Delay, so as to realize the node apparatus
It is synchronous with the host node.
There is provided a kind of node apparatus for Wireless MESH network according to another aspect of the present invention, it is characterised in that bag
Include：
Transmitter；
Receiver；
Processor；
Memory, stores the instruction that following operation is completed for the processor：
Broadcast synchronization signal；
The access signal that at least one sends from node described in detection；
The access signal detected according to delay time signal detection module estimates corresponding Delay；
Broadcast the Delay.
Synchronous method according to embodiments of the present invention and node apparatus can lift the net synchronization capability of MESH network node.
Brief description of the drawings
Its example embodiment is described in detail by referring to accompanying drawing, above and other feature of the invention and advantage will become
It is more obvious.
Figure 1A, 1B and 1C show the synchronizing process for Wireless MESH network according to an embodiment of the present invention；
Fig. 1 D show the synchronous regime after the synchronizing process shown in Figure 1A -1C；
Fig. 1 E show the signal sequence of the synchronizing process shown in Figure 1A -1C；
Fig. 1 F show the synchronizing process for Wireless MESH network according to another embodiment of the invention；
Fig. 1 G show the synchronizing process for Wireless MESH network according to another embodiment of the invention；
Fig. 2 shows to be used for the synchronous slave node side method of Wireless MESH network according to another embodiment of the invention；
Fig. 3 shows to be used for the synchronous host node method of Wireless MESH network according to another embodiment of the invention；
Fig. 4 shows the node apparatus for Wireless MESH network according to an embodiment of the present invention；
Fig. 5 shows the node apparatus for Wireless MESH network according to another embodiment of the invention；
Fig. 6 shows the node apparatus for Wireless MESH network according to another embodiment of the invention.
Specific embodiment
Example embodiment is described more fully with referring now to accompanying drawing.However, example embodiment can be real in a variety of forms
Apply, and be not understood as limited to embodiment set forth herein；On the contrary, thesing embodiments are provided so that the present invention will be comprehensively and complete
It is whole, and the design of example embodiment is comprehensively conveyed into those skilled in the art.Identical reference is represented in figure
Same or similar part, thus repetition thereof will be omitted.
Implement in addition, described feature, structure or characteristic can be combined in any suitable manner one or more
In example.Embodiments of the invention are fully understood so as to provide there is provided many details in the following description.However,
It will be appreciated by persons skilled in the art that technical scheme can be put into practice without one in the specific detail or more
It is many, or can be using other methods, constituent element, material, device, step etc..In other cases, it is not shown in detail or describes
Known features, method, device, realization, material operate to avoid fuzzy each aspect of the present invention.
Block diagram shown in accompanying drawing is only functional entity, not necessarily must be corresponding with physically separate entity.
I.e., it is possible to realize these functional entitys using software form, or these are realized in the module that one or more softwares are hardened
A part for functional entity or functional entity, or realized in heterogeneous networks and/or processor device and/or microcontroller device
These functional entitys.
The present invention provides a kind of two-way synchronization method for Wireless MESH network.
According to the design of the present invention, signal is sent respectively using host node and from node, is realized by bi-directional synchronization wireless
The synchronization of MESH network, can be obviously improved the net synchronization capability of MESH network node.
The example embodiment conceived according to the technology of the present invention is described with reference to the accompanying drawings.
Figure 1A, 1B and 1C show the synchronizing process for Wireless MESH network according to an embodiment of the present invention.Fig. 1 D
Synchronous regime after synchronizing process shown in Figure 1A -1C is shown.When Fig. 1 E show the signal of the synchronizing process shown in Figure 1A -1C
Sequence.
The synchronous method of Wireless MESH network according to embodiment of the present invention is described referring to Figure 1A -1E.
As shown in Figure 1A and 1E, the first step, it is determined that oneself is host node（source node）Afterwards, host node is according to this
Nodal clock, broadcast synchronization signal.In addition, can also broadcast system information.
The synchronizing signal sent from nodal test host node, obtains the frame boundaries on respective node.
In addition, broadcast singal is also can detect from node obtains system information.Due to the influence of transmission delay, each from node
On the frame boundaries that now obtain can all be deviated, as shown in T1, T2 in Figure 1A.
As shown in Figure 1B and 1E, second step, in order to further adjust from the frame boundaries on node, enable as far as possible with
Frame boundaries alignment on host node, from node according to the frame boundaries detected in such as first step, according to system information, each solely
Vertical access (discovery) signal that sends is to host node.
Host node on the basis of its local frame boundaries, detect from node send access signal, and estimate transmission when
Prolong information (TA).For example, on the basis of the local frame boundaries of host node synchronizing signal, detecting from the access signal of the transmission of node 1
Postpone as 2 times of T1, then it is T1 that can estimate from the propagation delay time of node 1.
In order to support it is multiple accessed simultaneously from node, multiple running time-frequency resources for being used to access can be set, and be numbered.It is main
All access running time-frequency resources of node traverses, after access signal is detected, estimate TA.
As shown in Fig. 1 C and 1E, the 3rd step, host node broadcasts TA values and corresponding access running time-frequency resource ID.
From node after access signal is sent, broadcast channel is continuously listened for, detects that oneself sends connecing for access signal
Whether have TA issue, until time-out if entering on running time-frequency resource, then it represents that failure.
If receiving TA information, the frame boundaries obtained from the first step are adjusted according to TA from node, with realization and main section
The accurate synchronization of point.
Then, SFN is detected from broadcast singal from node, oneself local SFN is updated, with Network Synchronization.
Fig. 1 D show the synchronous regime after the synchronizing process shown in Figure 1A -1C.Referring to Fig. 1 D, the final mesh of bi-directional synchronization
Mark is that the local frame boundaries on all nodes should realize the base of the whole network in a window centered on the frame boundaries by host node
This synchronization.
Compared to one-way synchronization technology, propagation delay time is reduce or eliminated according to the bi-directional synchronization technology of embodiment of the present invention
Influence, improve synchronous performance.
Fig. 2 shows to be used for the synchronous slave node side method of Wireless MESH network according to another embodiment of the invention.
Referring to Figure 1A -1E, as shown in Fig. 2 in S202, the synchronizing signal broadcasted from nodal test host node is locally being obtained
Take frame boundaries.
According to an embodiment, broadcast singal is also detected from node to obtain system information.
In S204, access signal is sent from node to host node.
According to an embodiment, it is multiple from node according to system information, respective independently transmitted access signal.
According to another embodiment, access signal is sent to host node from node according to frame boundaries.
In S206, the Delay issued from nodal test host node.
According to an embodiment, from node after access is sent to host node, continue listening broadcast channel, detection transmission connects
Enter the Delay for whether thering is host node to issue on the access running time-frequency resource of signal.
In S208, judge whether to detect Delay.If detecting Delay, S210 is gone to；Otherwise, go to
S212。
In S210, frame boundaries are adjusted according to Delay, so as to realize synchronous with host node.
For example, with reference to Fig. 1 C, its local frame boundaries is adjusted from node 1 according to time delay T1, and is adjusted from node 2 according to time delay T2
Its whole local frame boundaries, to realize the accurate synchronization with host node.After this, SFN can be detected from broadcast singal from node,
Oneself local SFN is updated, with Network Synchronization.
In S212, judge whether time-out.It is not timed-out, then goes to S206, continues to detect the Delay that host node is issued；
Otherwise, detection failure is represented, S214 is gone to.
In S214, judge whether the frequency of failure exceedes pre-determined number N.If being not above pre-determined number N, go to
S204, access signal is sent to host node.
Fig. 1 F and 1G show that sending repeatedly access signal from node completes synchronous schematic diagram.
In Fig. 1 F scene, for example, when host node receiver noise/interference is larger, host node can not every time into
The access signal that work(detection is sent from node, now needs repeatedly to send access signal from node（At most send n times）.
Referring to Fig. 1 F, in time point a, host node sends synchronizing signal.
In time point b, from nodal test to synchronizing signal.
In first time point c, access signal is sent from node.C and b fixed time aparts t, d and a fixed time apart
t。
Host node detection access Signal Fail.
In second time point c, access signal is sent from node.
In second time point e, host node detects the access signal sent from node.D and e intervals 2*T1.
In time point f, T1 is sent to from node by host node.
In time point g, T1 is received from node, frame boundaries are corrected according to T1.
In Fig. 1 G scene, for example, when larger from node receiver noise/interference, from node can not every time into
When work(detection includes T1 system information, it is also desirable to access signal is repeatedly sent from node.
Referring to Fig. 1 G, in time point a, host node sends synchronizing signal.
In time point b, from nodal test to synchronizing signal.
In time point c, access signal is sent from node.C and b fixed time aparts t, d and a fixed time apart t.
In first time point e, host node detects access signal.D and e intervals 2*T1.
In first time point f, T1 is sent to from node by host node.
From the failure of nodal test Delay.
In second time point c, access signal is sent from node.
In second time point e, host node detects the access signal sent from node.D and e intervals 2*T1.
In second time point f, T1 is sent to from node by host node.
In time point g, T1 is received from node, frame boundaries are corrected according to T1.
Fig. 3 shows to be used for the synchronous source node method of Wireless MESH network according to another embodiment of the invention.
Referring to Figure 1A -1E, as shown in figure 3, in S302, after host node is determined that it is, host node broadcast synchronization signal.Separately
Outside, host node can also broadcast system information.
In S304, host node detects at least one access signal sent from node.
According to an embodiment, host node sets at least one running time-frequency resource accessed at least one from node, at least
One running time-frequency resource has respective running time-frequency resource ID respectively.
According to another embodiment, host node travels through at least one running time-frequency resource to detect access signal.
In S306, host node estimates corresponding Delay according to the access signal detected.According to an embodiment, main section
Point estimates corresponding Delay on the basis of its local frame boundaries.
In S308, host node broadcast Delay.For example, according to an embodiment, host node broadcast Delay and correspondingly
Running time-frequency resource ID so that continue listening broadcast channel from the detectable access running time-frequency resource for sending access signal of node
Delay.
Fig. 4 shows the node apparatus for Wireless MESH network according to an embodiment of the present invention.
As shown in figure 4, the node apparatus 400 for Wireless MESH network may include synchronization signal detection module 402, access
Signal transmitting module 404, delay time signal detection module 406 and synchronization module 408.Node apparatus 400 can be as foregoing from section
Point.
Synchronization signal detection module 402 can be used for the synchronizing signal that detection host node is sent, and locally obtain frame boundaries.Root
According to an embodiment, synchronization signal detection module 402 also can detect broadcast singal and obtain system information.
Signal transmitting module 404 is accessed to can be used for sending access signal to host node.According to an embodiment, access signal hair
Module 404 is sent to be configured to send access signal to host node according to frame boundaries.According to an embodiment, signal transmitting module is accessed
404 according to independently transmitted access (discovery) signal of system information to host node.
Delay detection module 406 can be used for the Delay that detection host node is issued.According to an embodiment, time delay letter
Breath detection module 406 can be configured to：After access signal transmitting module sends access to host node, continue listening broadcast letter
Road, whether detection is sent on the access running time-frequency resource of access signal the Delay that host node is issued.
Synchronization module 408 can be used for when Delay detection module detects Delay, be adjusted according to Delay
Frame boundaries, so as to realize that the node apparatus is synchronous with host node.According to an embodiment, synchronization module 408 is from broadcast singal
SFN is detected, oneself local SFN is updated, with Network Synchronization.
Node apparatus 400 for Wireless MESH network can realize the previously described synchronization conceived according to the present application
Method, is repeated no more with foregoing similar explanation.
Fig. 5 shows the node apparatus for Wireless MESH network according to another embodiment of the invention.
As shown in figure 5, the node apparatus 500 for Wireless MESH network may include synchronizing signal sending module 502, access
Signal detection module 504, time delay estimation module 506 and time delay information sending module 508.Node apparatus 500 can be as foregoing
Host node.
Synchronizing signal sending module 502 can be used for broadcast synchronization signal.According to an embodiment, it is determined that node is host node
（source node）Afterwards, synchronizing signal sending module 502 is according to this nodal clock, broadcast synchronization signal.In addition, synchronizing signal
Sending module 502 can also broadcast system information.
Access signal detection module 504 can be used for the access signal for detecting that at least one sends from node.
According to an embodiment, node apparatus 500 also includes running time-frequency resource module, is used at least one from node for setting
At least one running time-frequency resource of access, at least one running time-frequency resource has respective running time-frequency resource ID respectively.
According to an embodiment, access signal detection module can be configured at least one running time-frequency resource of traversal to detect access letter
Number.
When time delay estimation module 506 estimates corresponding available for the access signal detected according to delay time signal detection module
Prolong information.According to an embodiment, time delay estimation module be can be configured on the basis of local frame boundaries, and mould is detected according to delay time signal
The access signal that block is detected, estimates corresponding Delay.
Delay sending module 508 can be used for broadcast Delay.According to an embodiment, Delay sending module can
It is configured to broadcast Delay and corresponding running time-frequency resource ID.
Node apparatus 500 for Wireless MESH network can realize the previously described synchronization conceived according to the present application
Method, is repeated no more with foregoing similar explanation.
Wireless MESH network system according to an embodiment of the present invention may include the node dress that foregoing reference picture 4 is described
Put, as from node apparatus, and may include the node apparatus that foregoing reference picture 5 is described, be used as master node device.It is such wireless
MESH network system can be obviously improved the net synchronization capability of network node.
Fig. 6 shows the node apparatus for Wireless MESH network according to an embodiment of the present invention.
As shown in fig. 6, the node apparatus 600 for Wireless MESH network may include processor 602, memory 604, transmitting
Device 606 and receiver 608.
Memory 604 can store the instruction that operation processing is performed for processor 602.The memory 504 of memory 604 can be wrapped
Include volatibility or nonvolatile memory, such as static RAM（SRAM）, Electrically Erasable Read Only Memory
（EEPROM）, Erasable Programmable Read Only Memory EPROM（EPROM）, programmable read only memory（PROM）, read-only storage（ROM）
Deng the present invention is not limited in this respect.
Processor 602 can call the instruction that is stored in memory 604 to perform associative operation, such as control transmitter 606 and connect
Receive device 608 and carry out signal transmitting and receiving etc..
According to an embodiment, memory 604 is stored completes the instruction that operates below for processor 602：When the transmitting
Device is distributed for each of the multiple receiving node when a time slot application different sub-carrier is to multiple receiving node transmission signals
Transmission power, and each transmission power of distribution is related to correspondingly received node.It is used for it can be readily appreciated that memory 604 can also be stored
Processor 602 completes the instruction of other operations according to embodiments of the present invention, repeats no more here.
According to another embodiment, memory 604 is stored completes the instruction that operates below for processor 602：Broadcast synchronization
Signal；The access signal that at least one sends from node described in detection；The access letter detected according to delay time signal detection module
Number corresponding Delay of estimation；Broadcast the Delay.It can be readily appreciated that memory 604 can be also stored for processor 602
The instruction of other operations according to embodiments of the present invention is completed, is repeated no more here.
The description of embodiment more than, those skilled in the art are it can be readily appreciated that the method for the embodiment of the present invention and corresponding
Module can be realized by way of software or partial software hardening.Therefore, the technical scheme of the embodiment of the present invention can be with
The form of software product is embodied, and the software product can be stored in a non-volatile memory medium（Can be CD-ROM,
USB flash disk, mobile hard disk etc.）In, including some instructions are to cause a computing device（Can be personal computer, server, shifting
Dynamic terminal or the network equipment etc.）Perform method according to embodiments of the present invention.
It will be understood by those skilled in the art that accompanying drawing is the schematic diagram of example embodiment, module or flow in accompanying drawing
Not necessarily implement the present invention necessary, therefore cannot be used for limiting the scope of the invention.
It will be appreciated by those skilled in the art that above-mentioned each module can be distributed in device according to the description of embodiment, also may be used
It is disposed other than with carrying out respective change in one or more devices of the present embodiment.The module of above-described embodiment can be merged into
One module, can also be further split into multiple submodule.
The exemplary embodiment of the present invention is particularly shown and described above.It should be understood that the invention is not restricted to sent out
Bright embodiment, on the contrary, it is intended to cover comprising various modifications in the spirit and scope of the appended claims and wait
Effect arrangement.
Claims (19)
1. a kind of synchronous method for Wireless MESH network, it is characterised in that including：
The synchronizing signal broadcasted from nodal test host node, is locally obtaining frame boundaries；
It is described that access signal is sent from node to the host node；
The Delay issued from host node described in nodal test；
If described from nodal test to the Delay, the frame boundaries are adjusted according to the Delay, so that real
It is now synchronous with the host node.
2. synchronous method as claimed in claim 1, it is characterised in that described that access signal is sent from node to the host node
Including：It is described to send access signal to the host node according to the frame boundaries from node.
3. synchronous method as claimed in claim 1, it is characterised in that the time delay issued from host node described in nodal test
Information includes：It is described from node after the access is sent to the host node, continue listening broadcast channel, detection sends institute
The Delay for whether thering is the host node to issue on the access running time-frequency resource for stating access signal.
4. a kind of synchronous method for Wireless MESH network, it is characterised in that including：
Host node broadcast synchronization signal；
The access signal that at least one sends from node described in the host node detection；
The host node estimates corresponding Delay according to the access signal detected；
The host node broadcasts the Delay.
5. synchronous method as claimed in claim 4, it is characterised in that also include：The host node is set for described at least
One at least one running time-frequency resource from node access, at least one described running time-frequency resource has respective running time-frequency resource respectively
ID。
6. synchronous method as claimed in claim 5, it is characterised in that at least one sends out from node described in the host node detection
The access signal sent includes：The host node travels through at least one described running time-frequency resource to detect access signal.
7. synchronous method as claimed in claim 6, it is characterised in that the host node, which broadcasts the Delay, to be included：
The host node broadcasts the Delay and the corresponding running time-frequency resource ID.
8. synchronous method as claimed in claim 4, it is characterised in that the host node is estimated according to the access signal detected
Corresponding Delay includes：The host node estimates corresponding Delay on the basis of its local frame boundaries.
9. a kind of node apparatus for Wireless MESH network, it is characterised in that including：
Synchronization signal detection module, for detecting the synchronizing signal that host node is sent, is locally obtaining frame boundaries；
Signal transmitting module is accessed, for sending access signal to the host node；
Delay detection module, for detecting the Delay that the host node is issued；
Synchronization module, for when the Delay detection module detects the Delay, according to the Delay
The frame boundaries are adjusted, so as to realize that the node apparatus is synchronous with the host node.
10. node apparatus as claimed in claim 9, it is characterised in that the access signal transmitting module is configured to according to institute
State frame boundaries and send access signal to the host node.
11. node apparatus as claimed in claim 9, it is characterised in that the Delay detection module is configured to：Described
Access signal transmitting module is sent to the host node after the access, continues listening broadcast channel, is detected and is connect described in sending
Enter the Delay for whether thering is the host node to issue on the access running time-frequency resource of signal.
12. a kind of node apparatus for Wireless MESH network, it is characterised in that including：
Synchronizing signal sending module, for broadcast synchronization signal；
Signal detection module is accessed, for detecting at least one described access signal for being sent from node；
Time delay estimation module, the access signal for being detected according to delay time signal detection module estimates corresponding Delay；
Delay sending module, for broadcasting the Delay.
13. node apparatus as claimed in claim 12, it is characterised in that also including running time-frequency resource module, is used for for setting
It is described at least one from node access at least one running time-frequency resource, at least one described running time-frequency resource respectively have it is respective when
Frequency resource ID.
14. node apparatus as claimed in claim 13, it is characterised in that the access signal detection module is configured to：Traversal
At least one described running time-frequency resource is to detect access signal.
15. node apparatus as claimed in claim 14, it is characterised in that the Delay sending module is configured to broadcast institute
State Delay and the corresponding running time-frequency resource ID.
16. node apparatus as claimed in claim 12, it is characterised in that time delay estimation module is configured to：With local frame boundaries
On the basis of, the access signal detected according to delay time signal detection module estimates corresponding Delay.
17. a kind of Wireless MESH network system, it is characterised in that including：
Node apparatus as described in claim any one of 9-11, as from node apparatus；And
Node apparatus as described in claim any one of 12-16, is used as master node device.
18. a kind of node apparatus for Wireless MESH network, it is characterised in that including：
Transmitter；
Receiver；
Processor；
Memory, stores the instruction that following operation is completed for the processor：
The synchronizing signal that host node is sent is detected, frame boundaries are locally being obtained；
Access signal is sent to the host node；
Detect the Delay that the host node is issued；
When detecting the Delay, the frame boundaries are adjusted according to the Delay, so as to realize the node apparatus
It is synchronous with the host node.
19. a kind of node apparatus for Wireless MESH network, it is characterised in that including：
Transmitter；
Receiver；
Processor；
Memory, stores the instruction that following operation is completed for the processor：
Broadcast synchronization signal；
The access signal that at least one sends from node described in detection；
The access signal detected according to delay time signal detection module estimates corresponding Delay；
Broadcast the Delay.
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| CN2016101279340 | 2016-03-04 | ||
| CN201610127934.0A CN105792346A (en) | 2016-03-04 | 2016-03-04 | Synchronization method, node device and wireless MESH network system |
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