CN101321027B - Synchronization process of wireless mesh network - Google Patents
Synchronization process of wireless mesh network Download PDFInfo
- Publication number
- CN101321027B CN101321027B CN200810116932A CN200810116932A CN101321027B CN 101321027 B CN101321027 B CN 101321027B CN 200810116932 A CN200810116932 A CN 200810116932A CN 200810116932 A CN200810116932 A CN 200810116932A CN 101321027 B CN101321027 B CN 101321027B
- Authority
- CN
- China
- Prior art keywords
- priority
- node
- synchronous
- presynchronization
- timestamp
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
- 238000000034 method Methods 0.000 title claims abstract description 24
- 230000001360 synchronised effect Effects 0.000 claims abstract description 122
- 230000009191 jumping Effects 0.000 claims description 3
- 238000012546 transfer Methods 0.000 claims description 3
- 230000009286 beneficial effect Effects 0.000 abstract 1
- 208000004350 Strabismus Diseases 0.000 description 5
- 230000005540 biological transmission Effects 0.000 description 5
- 238000005516 engineering process Methods 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000004891 communication Methods 0.000 description 1
- 238000012937 correction Methods 0.000 description 1
- 239000013078 crystal Substances 0.000 description 1
- 230000002950 deficient Effects 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 230000010365 information processing Effects 0.000 description 1
Images
Landscapes
- Mobile Radio Communication Systems (AREA)
Abstract
一种无线网状网的精确同步方法，在无线网状网的信标帧的同步协议元素中添加同步定时信息和预同步，包括预同步优先级和同步后优先级，预同步优先级通过预先设定和路由信息获得，同一网状网节点的预先设定优先级应不同；在未同步和失去同步时，同步后优先级等于预同步优先级，在同步后，节点的同步后优先级等于所同步节点的同步后优先级。在同步时，低预同步优先级的节点同步到同步后优先级的节点；当多个节点提供相同的优先级时，较慢的节点同步到较快的节点。通过应用本发明，对于网状网确定性接入，尤其是广播和信息向一个节点汇聚的应用场景，有利于提高网络的吞吐量。
A precise synchronization method for a wireless mesh network, adding synchronization timing information and pre-synchronization in the synchronization protocol elements of the beacon frame of the wireless mesh network, including pre-synchronization priority and post-synchronization priority, the pre-synchronization priority is passed through the pre-synchronization Setting and routing information acquisition, the pre-set priority of the same mesh network node should be different; when not synchronized or out of synchronization, the priority after synchronization is equal to the priority of pre-synchronization, after synchronization, the priority of the node after synchronization is equal to The post-sync priority of the synced node. When synchronizing, nodes with low pre-synchronization priority synchronize to nodes with post-synchronization priority; when multiple nodes provide the same priority, slower nodes synchronize to faster nodes. By applying the present invention, for the deterministic access of the mesh network, especially the application scenario of broadcasting and information gathering to one node, it is beneficial to improve the throughput of the network.
Description
Technical field
The present invention relates to the computer network information processing technology field, more specifically, the present invention relates to a kind of method for synchronous of wireless mesh network.
Background technology
Wireless mesh network is a kind of and traditional diverse network of WLAN, comprises that scope is wider relatively, as long as exist a node to transmit the packet that is transferred to other node in the wireless network, such network is exactly a wireless mesh network in general sense.In practice, wireless mesh network generally is meant the broadband wireless network of the GB15629.11 national standard that satisfies the IEEE802.11s standard or formulating.
Traditional wireless network must be visited concentrated access point just can carry out wireless connections, even two nodes are adjacent to each other, also must just can communicate through access point.And in network in wireless mesh network, each node can carry out direct communication with one or more peer node.
Activate in the probing response frame of synchronous protocol in beacon and announcement, mesh node is used mesh node synchronous protocol element.For a mesh node, can support multiple synchronous protocol, but in specific a period of time, only activate a kind of synchronous protocol.Based on the needs that self need with neighbours' mesh node, support the mesh node of synchronous protocol will select with neighbours' mesh node perhaps synchronous synchronously for one with a sub-set of neighbours' mesh node.
Neighbours' agreement that squints is a kind of synchronous protocol that allows mesh node to pass through neighbours' mesh node tracking time.The mesh node of supporting this agreement is through setting up synchronously, between self timing synchronization function (TSF) timer and neighbours' timing synchronization function timer, calculates the time bias value.Other node that mesh node is independent of in the mesh network network begins the timing synchronization function timer, may carry out the renewal of self synchronizing function timer through the beacon that receives from other mesh node or the timestamp the probing response frame then.
When a node receives the more value of fast timing synchronizing function timer; The value that needs the timing synchronization function timer of renewal self; Synchronous with the node of the value of sending this timing synchronization function timer, that is: each node is always synchronous with the fastest node hardy in the network.
Existing synchronous protocol accuracy is below 1024 microseconds, and in mesh network, as if the speed rates of physical layer with 54Mbps, in this time, at least 3 packets may take place to send conflict because of stationary problem, thereby influence network throughput.In addition, because the fastest node is always led over other node, in fact the fastest node is always nonsynchronous with other node.In future, because the raising of link layer transmission rate, sending conflict can further increase.
Summary of the invention
For overcoming the defective of the network conflict that brings owing to high-speed transfer in the existing network transmission, the present invention proposes a kind of method for synchronous of wireless mesh network.
According to an aspect of the present invention, proposed a kind of method for synchronous of wireless mesh network, having comprised:
Step 10), in the synchronous protocol element of the wireless mesh network beacon frame that transceiver sent of each node, add synchronous priority and inferior timestamp timing information;
Step 20), the transceiver of said each node passes through more said synchronous priority and said inferior timestamp timing information when transfer of data with the transceiver of the node that sends beacon frame; Confirm the synchronous priority of the transceiver of said each node, realize the synchronous of said wireless mesh network.
Wherein, step 10) further comprises:
Step 110), in the synchronous protocol element of each node, add presynchronization priority territory, priority territory, back and inferior timestamp timing information synchronously, and set said presynchronization priority;
Step 120), the synchronous back priority of said each node of renewal equals its presynchronization priority.
Wherein, step 20) further comprise:
The two said presynchronization priority, said synchronous back priority and said inferior timestamp timing information of more said node and the node that sends beacon frame confirmed self synchronous back priority.
Wherein, step 110) also comprise: said node during according to operation information confirm self presynchronization priority, said presynchronization priority equals the jumping figure that said node sent/transmitted a path of data arrives wired network access point.
Wherein, step 110) in, the presynchronization priority level initializing of the different nodes of same wireless mesh network is got different value.
Wherein, step 20) also comprise:
When other node of high priority synchronous, the synchronous back priority of said node equal the priority of other node of synchronous high priority;
When the priority of other node of synchronous high priority reduce, the synchronous back priority of said node transceiver correspondingly reduces.
Wherein, step 20) also comprise:
The node of low presynchronization priority is synchronous with the node of high back synchronously priority;
When a plurality of nodes provided identical synchronous back priority, the node of low presynchronization priority and the node of high presynchronization priority were synchronous;
When the synchronous back of node priority was all identical with low presynchronization priority, slower node was synchronized to node faster.
Wherein, The node of said low priority is synchronized to the node of high priority; And slower node is synchronized to faster, and the step of node comprises: when low priority or slower node receive highlyer or faster when the timestamp that sends of node and inferior timestamp than own priority, use high timestamp of priority and inferior timestamp to replace self timestamp and inferior timestamp.
Wherein, said inferior timestamp timing information refers to provide the additional timing information of the timestamp that the wireless mesh network standard beacon frame is carried of higher timing accuracy.
Through using the present invention, insert for the mesh network certainty, the application scenarios that converges to a node of broadcasting and information especially can significantly improve the throughput of network.
Description of drawings
Fig. 1 is the wireless mesh network structural representation;
Fig. 2 is according to wireless mesh network presynchronization priority sketch map of the present invention;
Fig. 3 is according to wireless mesh network method for synchronous flow chart of the present invention;
Fig. 4 is according to the synchronous back of wireless mesh network of the present invention priority sketch map.
Embodiment
Be described in detail below in conjunction with accompanying drawing and specific embodiment method for synchronous a kind of wireless mesh network provided by the invention.
Wireless mesh network is a kind of expansion of IEEE 802.11 serial WLAN basic service set networks, is a kind of novel public access wireless LAN and metropolitan area network solution.Different with conventional wlan, wireless mesh network is transferred to cable broadband network with data with wireless mode, thereby reduces the demand to wired connection with high costs, and reduces the complexity of network design.The topology of wireless mesh network is arbitrarily, is similar to fishnet, has mulitpath from a node to another node, and because adopt radio frequency transmission, so be referred to as wireless mesh network.
Fig. 1 is the structural representation of wireless mesh network, and according to IEEE 802.11s draft standard, comprise in a wireless mesh network: one or more mesh network is to the access point MPP of wired network, A1 shown in the figure and A2; A plurality of mesh node MP that are used to transmit data, the D1 shown in the figure, D2 and D3, MP only have the data forwarding function; A plurality of mesh node and user access point MAP, B1 shown in the figure and B2; Subscriber station (STA) C1, C2, C3 and C4 can insert mesh network through MAP, and the data of subscriber station STA are forwarded to access point A1 or the A2 of mesh network to wired network by route.
In existing wireless mesh network IEEE 802.11s draft standard,, in the wireless mesh network standard, introduce a kind of expansion synchronization framework for the synchronous protocol realization that makes the mesh network network is more flexible.In this synchronous extension framework, introduce neighbours' synchronous protocol that squints, can realize the interoperability of smallest synchronization ability and mesh node.Mesh node is used the synchronous protocol element at beacon with announcing in the probing response frame that activates synchronous protocol.
According to this synchronization framework, node can select flexibly with other node synchronously.Common implementation is to have only when a node receives faster timestamp, and it just upgrades himself synchronizing function timer, and synchronous with the node that sends this timestamp, that is: each node is always synchronous with the fastest node hardy in the network.Existing synchronous protocol accuracy is below 1024 microseconds, and in wireless mesh network, as if the speed rates of physical layer with 54Mbps, in this time, at least 3 packets may take place to send conflict because of stationary problem, thereby influence network throughput.
In order to improve network performances such as throughput, the node M PP A1 of wireless mesh network, MPP A2, MAP B1 and MAP B2 and MP D often adopt a plurality of wireless transceivers, and work in respectively on the different channels.According to embodiments of the invention; In the synchronous protocol element of the wireless mesh network beacon frame that transceiver sent, add presynchronization priority territory, synchronous priority territory, back and inferior timestamp timing information territory; Be respectively applied for definition mesh node required presynchronization priority when synchronous, back priority and inferior timestamp timing information synchronously, what be used to realize is that to have each transceivers of wireless netted network node of a plurality of wireless transceivers synchronous with the transceiver of other node that works in same channel.
Synchronous protocol element according to the present invention is as shown in table 1 below, comprises outside element ID E1, length E2, the synchronous protocol identification E3, also comprises the synchronous protocol content territory of 4 bytes.
Table 1 wireless mesh network synchronous protocol element is formed
Element ID E1 is the identifier of synchronous protocol element, and length E2 is the length of synchronous protocol element, and the representative content definition of synchronous protocol differential threshold E3 is as shown in table 2 below; The synchronous protocol differential threshold comprises 4 bytes; Be made up of with its value OUI, OUI is 3 bytes, and the value of OUI is 1 byte.
The representative content of table 2 synchronous protocol differential threshold
| OUI (3 byte) | Value | Meaning |
| 00-0F-AC | 0 | Neighbours' synchronous protocol that squints |
| 00-0F-AC | 1-255 | Undefined |
| 00-0C-CC | 0 | Accurate neighbours' synchronous protocol that squints |
| 00-0C-CC | 0 | Classification precise synchronization agreement |
| The OUI of provider | 0-255 | Provider is specific |
Typically be embodied as:
(1) when definition OUI be 00-0F-AC, when value is 0, the neighbours that adopt 802.11 standards to define the synchronous protocol that squints;
(2) when the definition OUI be 00-0F-AC, when value is 1-255, for reserving undefined part;
(3) when definition OUI be 00-0C-CC, when value is 0, the classification synchronous protocol of embodiments of the invention definition is adopted in expression, the priority of all network nodes is identical;
(4) when definition OUI be 00-0C-CC, when value is 1, the classification synchronous protocol of embodiments of the invention definition is adopted in expression;
(5) when definition OUI for the OUI of other provider, when value is 0-255, define especially by other provider.
Especially, when OUI=00-0C-CC, the concrete realization of synchronous protocol content territory E4 is as shown in table 3 below; Comprise presynchronization priority F1, synchronous back priority F2, reservation F3, prolongation stamp mask F4, prolongation stamp F5, wherein, F1 accounts for 8 bits; F2 accounts for 8 bits; F3 accounts for 2 bits, and F4 accounts for 4 bits, and F5 accounts for 10 bits.
The data format in table 3 synchronous protocol content territory
The value of prolongation stamp mask is represented the number of significant digit of inferior timestamp, and significance bit begins to count from a high position, is 10 to the maximum.Inferior timestamp timing information, it is 1023 delicate to be meant that the additional timing information of the timestamp that the wireless mesh network standard beacon frame is carried that higher timing accuracy is provided, the value of inferior timestamp are to the maximum, and the value of least significant bit back thinks 0, that is:
The value of inferior timestamp={ value that the prolongation stabs } step-by-step with by the significance bit of inferior timestamp several 1,10 deduct inferior timestamp several 0 binary numbers of constituting of significance bit.
Mesh node MP, MPP and MAP transceiver during according to preset priority or according to operation information confirm presynchronization priority of self and back priority synchronously.Presynchronization priority F1 representes the initial synchronisation priority of node; Be the synchronizing capacity of node, for MPP, this is worth between 1-127; The presynchronization priority F1 of the different MPP of the same wireless mesh network difference of should trying one's best, otherwise possibly cause " isolated island synchronously ".The presynchronization Determination of priority method of MPP is generally: if node configuration advanced clock source, its priority should be set to higher.Disposed GPS (GPS) such as a certain MPP, the timing accuracy that is no more than 20ns with the universal time error can be provided, its presynchronization priority can be selected between 1-31 at random.If there is the MPP of a plurality of GP configuring S in the network,, form " isolated island synchronously " even their presynchronization priority is identical, can not impact, because they are synchronous with universal time network performance yet.All configurations the MPP of GPS between 1-31, select its priority at random, also reduced the identical possibility of presynchronization priority.If the clock source that the general crystal oscillator of node configuration ratio of precision is higher, its presynchronization priority can be selected between 32-63 at random.
For MP and MAP, its presynchronization priority is between 128-255, and the jumping figure that the transceiver that presynchronization priority equals node sent/transmitted a path of data arrives wired network access point adds 128.
Wireless mesh network as shown in Figure 2, the presynchronization priority of each node is: node A1 is a MPP, and its presynchronization priority is chosen as 1 in this example at random between 0-127, A2 also is a MPP, for different with A1, has selected the presynchronization priority 2.The suppose priorities value is more little in this example, and priority is high more.Mesh node D1 { realizes and the communicating by letter of wired network that D1 is a hop node of route, so its presynchronization priority is 128+1=129 thereby G1} is connected to MPP A1 through route; { G5 realizes and the communicating by letter of wired network that so D2 is two hop nodes of route, its presynchronization priority is 128+2=130 thereby G1} is connected to MPP A1 to mesh node D2 through route; Mesh node D3 { realizes and the communicating by letter of wired network that so D3 is a hop node of route, its presynchronization priority is 128+1=129 thereby G4} is connected to MPP A2 through route; { G3 realizes and the communicating by letter of wired network that so B2 is two hop nodes of route, its presynchronization priority is 128+2=130 thereby G4} is connected to MPP A2 through route for mesh node and user access point MAP B2; { G2} is connected to MPP A1, thereby realizes and the communicating by letter of wired network that so B1 is a hop node of route, its presynchronization priority is 128+1=129 through route for mesh node and user access point MAP B1.
Fig. 3 is the synchronous schematic flow sheet of wireless mesh network according to the present invention.Be used for a certain node is carried out synchronously, be called this node below the synchronous a certain node.As shown in the figure, priority was presynchronization priority after this node obtained presynchronization priority and upgrades synchronously, began to receive data; Judge whether Synchronization timeout, if having overtimely, needing to upgrade again synchronously, back priority is presynchronization priority; Judge whether the beacon synchronization response frame that receives comprises regularly synchronizing information element,, return and receive next data if do not comprise; If comprise, with the synchronously back priority ratio of the synchronous back priority that comprises in the timing synchronizing information element that receives and this node, if the former priority is littler; Then return and receive next data, if it is the former priority is bigger, then synchronous with the node that sends this beacon synchronization response frame this node; And upgrade the priority of the synchronous back priority of this node for the node of this beacon synchronization response frame of transmission; If the former equates with the latter, compares the presynchronization priority of two nodes, if the former presynchronization priority is bigger; This node and said node is synchronous, receive next data otherwise return.
More specifically, the inter-synchronuos method mutually between node M P, MAP and MPP is: the node of the first-selected high synchronously back synchronously of the node of low presynchronization priority priority; When a plurality of nodes provided identical synchronous back priority, the node first-selection of low presynchronization priority was synchronized to the node of high presynchronization priority; When synchronous back priority was identical with low presynchronization priority, slower node was synchronized to node faster.Synchronously back priority is node M P, MAP and MPP and the priority of neighbor node after synchronously, when as yet synchronously or do not lose with other node synchronous, synchronously after priority equal presynchronization priority.
Comprise in the mesh network MP, MAP and MPP all nodes transceiver according to when operation information confirm that the method for the synchronous back priority of self is: when other node of accomplishing with high priority synchronous, then the synchronous back priority of node transceiver equal the priority of other node of synchronous high priority.The node of low priority is synchronized to the node of high priority; And slower node is synchronized to faster, and the method for node is: when low priority or slower node receive the high or timestamp and the inferior timestamp that send of node faster than own priority, then that route priority is high timestamp replaces timestamp and the inferior timestamp of self.
For example; In Fig. 2, MP D1 receive MPP A1 and MPP A2 carry synchronous protocol element beacon after, find that the presynchronization priority of MPP A1 is the highest; Then synchronous with it, with the value of the timing synchronization function timer of high timestamp of the priority that receives MPP A1 and inferior timestamp correction self:
The representative of the offset of MPP A1 mesh node=MPP A1 timestamp and inferior timestamp time-value of self current timing synchronization function timer;
The offset of the value+MPP A1 mesh node of the current timing synchronization function timer of the value of the timing synchronization function timer that MP D1 is new=MP D1 self;
MP D1 with its synchronously back priority change 1 into, and in the synchronous protocol element of the beacon of its transmission, broadcast;
MAP B1 adopt use the same method synchronous with A1, its synchronously back priority be 1.
Other node adopts the method for similar D1 and B1 and neighbours' priority node synchronous: D2, A2 find that the synchronous back priority of D1 is higher than the reservation priority of self, change 1 into synchronously and with their synchronous back priority with D1.
MP D3 adopt use the same method synchronous with A2, its synchronously back priority be 1.
MAP B2 adopt use the same method synchronous with MP D3, its synchronously back priority be 1.
When the priority of other node of synchronous high priority reduce, then the synchronous back priority of node transceiver correspondingly reduces.MP D3 might at first receive beacon that MPP A2 sends and this moment A2 not synchronous as yet with D1, its preparatory priority is 2, and back priority is 2 synchronously.This moment D3 can select with A2 synchronous, its synchronously back priority be 2.And after this, A2 and D1 are synchronous, and its synchronous back priority becomes 1.When MP D3 receives the synchronous element of timing from the beacon of A2 once more, D3 with its synchronously back priority update be 1.
After the Network Synchronization, the synchronous back priority of all nodes of network shown in Figure 2 is 1, and is as shown in Figure 4.
What should explain at last is; Above embodiment is only in order to describe technical scheme of the present invention rather than the present technique method is limited; The present invention can extend to other modification, variation, application and embodiment on using, and therefore thinks that all such modifications, variation, application, embodiment are in spirit of the present invention and teachings.
Claims (6)
1. the method for synchronous of a wireless mesh network comprises:
Step 10), in the synchronous protocol element of the wireless mesh network beacon frame that transceiver sent of each node, add presynchronization priority territory, priority territory, back and inferior timestamp timing information synchronously, and set said presynchronization priority; Wherein, Said inferior timestamp timing information refers to provide the additional timing information of the timestamp that the wireless mesh network standard beacon frame is carried of higher timing accuracy; Said presynchronization priority is represented the initial synchronisation priority of node, said synchronous back priority be this node with neighbor node the priority after synchronous;
Step 20), the transceiver of the transceiver of said each node and the node that sends beacon frame is through more said presynchronization priority when transfer of data, said synchronous back priority and said inferior timestamp timing information, confirms priority behind transceiver synchronous of said each node;
The node of low presynchronization priority is synchronous with the node of high back synchronously priority;
When a plurality of nodes provided identical synchronous back priority, the node of low presynchronization priority was synchronized to the node of high presynchronization priority;
When the synchronous back of node priority was all identical with low presynchronization priority, slower node was synchronized to node faster.
2.
AsThe described method of claim 1, wherein, step 10) further comprises:
The synchronous back priority of upgrading said each node equals its presynchronization priority.
3.
AsThe described method of claim 1, wherein, step 10) also comprises:
Said node according to when operation information confirm that self presynchronization priority, said presynchronization priority equal the jumping figure that said node sent/transmitted a path of data arrives wired network access point and adds 128.
4.
AsThe described method of claim 1, wherein, step 20) also comprise:
When synchronous with other node of high priority, the synchronous back priority of said node equal the priority of other node of synchronous high priority;
When the priority of other node of synchronous high priority reduce, the synchronous back priority of said node transceiver correspondingly reduces.
5.
AsThe described method of claim 1; Wherein, The node of said low presynchronization priority is synchronized to the node of high presynchronization priority; And slower node is synchronized to faster, and the step of node comprises: when low presynchronization priority or slower node receive highlyer or faster when the timestamp that sends of node and inferior timestamp than own presynchronization priority, use high timestamp of presynchronization priority and inferior timestamp to replace self timestamp and inferior timestamp.
6.
AsThe described method of claim 2, wherein, in the step 10), the presynchronization priority level initializing of the different nodes of same wireless mesh network is got different value.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200810116932A CN101321027B (en) | 2008-07-21 | 2008-07-21 | Synchronization process of wireless mesh network |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200810116932A CN101321027B (en) | 2008-07-21 | 2008-07-21 | Synchronization process of wireless mesh network |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN101321027A CN101321027A (en) | 2008-12-10 |
| CN101321027B true CN101321027B (en) | 2012-09-05 |
Family
ID=40180893
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN200810116932A Active CN101321027B (en) | 2008-07-21 | 2008-07-21 | Synchronization process of wireless mesh network |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN101321027B (en) |
Families Citing this family (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2011097770A1 (en) * | 2010-02-15 | 2011-08-18 | Nokia Siemens Networks Oy | Synchronisation in a communication system |
| CN102014464B (en) * | 2010-11-19 | 2013-07-24 | 重庆金美通信有限责任公司 | Method for synchronously processing networks in wireless MESH network |
| CN102855275B (en) * | 2012-07-18 | 2016-12-21 | 公安部第一研究所 | A kind of move database synchronous method that there is not knowledge based storehouse under wireless network environment and system |
| CN105282840B (en) * | 2014-07-24 | 2019-02-22 | 北京信威通信技术股份有限公司 | A kind of method of time synchronization between mobile Ad hoc network interior joint |
| CN105281884B (en) * | 2014-07-24 | 2019-02-22 | 北京信威通信技术股份有限公司 | A kind of node time synchronous method in network without center |
| CN106162810B (en) * | 2016-08-30 | 2019-05-28 | 北京交通大学 | A kind of new node networking synchronous method of wireless multi-hop collaborative network |
| CN107979498B (en) * | 2018-01-03 | 2020-12-11 | 深圳市吉祥腾达科技有限公司 | A mesh network cluster and a large file transmission method based on the cluster |
| CN111405654B (en) * | 2020-03-22 | 2021-08-20 | 西安电子科技大学 | Information transmission method between highly dynamic wireless nodes |
| US12289132B2 (en) * | 2022-05-19 | 2025-04-29 | Nec Corporation | Time synchronization method with trusted beacons and distributed fiber sensing |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1606839A (en) * | 2001-12-21 | 2005-04-13 | 诺基亚公司 | Apparatus and an associated method for facilitating synchronization in a wireless mesh network |
| CN1937556A (en) * | 2005-08-24 | 2007-03-28 | 摩托罗拉公司 | Timing synchronization of mesh points in a wireless communication network |
-
2008
- 2008-07-21 CN CN200810116932A patent/CN101321027B/en active Active
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1606839A (en) * | 2001-12-21 | 2005-04-13 | 诺基亚公司 | Apparatus and an associated method for facilitating synchronization in a wireless mesh network |
| CN1937556A (en) * | 2005-08-24 | 2007-03-28 | 摩托罗拉公司 | Timing synchronization of mesh points in a wireless communication network |
Also Published As
| Publication number | Publication date |
|---|---|
| CN101321027A (en) | 2008-12-10 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN101321027B (en) | Synchronization process of wireless mesh network | |
| US7729336B2 (en) | Synchronization and timing source priority in an ad-hoc network | |
| CN101616479B (en) | The method and apparatus that time synchronized is carried out in TDMA multi-hop wireless networks | |
| TWI322601B (en) | Wireless ad-hoc communication system and communication terminal synchronizing method in wireless ad-hoc communication system | |
| US8467370B2 (en) | Beaconing techniques in frequency hopping spread spectrum (FHSS) wireless mesh networks | |
| US20090041003A1 (en) | Synchronization of distributed networks | |
| KR100438824B1 (en) | Methods for compensating propagation delay in point-to-multipoint data communication networks | |
| CN106658735A (en) | TDMA based long propagation delay wireless link time slot distribution method | |
| JP2009533943A (en) | Apparatus and method for supporting relay service in multi-hop relay broadband wireless access communication system | |
| EP3104556B1 (en) | Clock synchronization method and device, and communication system | |
| CN101610594A (en) | TD-OFDMA-based Dynamic Hierarchical PMP/Mesh Hybrid Network System and Its Superframe Structure | |
| JP2023506489A (en) | System and method for large phase correction in R-PHY network architecture | |
| CN104853375A (en) | Sending method for avoiding beacon frame collision in enhanced wireless local area network | |
| CN101155101A (en) | Method, device and system for avoiding conflict of beacon information in wireless local area network mesh network | |
| WO2016185291A1 (en) | Frame start optimizing in telecommunications systems | |
| CN100488175C (en) | Serial tandem connection bus up flow control method and node equipment | |
| CN105072586B (en) | To the management method of the forwarding of broadcast message in embedded radio self-organizing network | |
| US20240064671A1 (en) | Informing in groups of iab mt-du resource misalignment | |
| CN101800612A (en) | MAC (Media Access Control) layer synchronizing method improved based on IEEE 802.16d | |
| JP3865223B2 (en) | Wireless network time synchronization method | |
| CN101541106B (en) | Relay method in wireless communication system | |
| CN105704808B (en) | The Distributed Time synchronous method of multihop self-organizing network | |
| CN102104931B (en) | Method and device for fragmenting, sending and receiving network topology information | |
| CN106358240B (en) | A data frame transmission method and device for virtual elastic CPRI interface | |
| CN109586834B (en) | A Method for Automatic Selection of Auxiliary Time Base |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant |