CN105101098A - MANET (Mobile Ad Hoc Network) physical layer synchronizing method - Google Patents
MANET (Mobile Ad Hoc Network) physical layer synchronizing method Download PDFInfo
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- CN105101098A CN105101098A CN201410196914.XA CN201410196914A CN105101098A CN 105101098 A CN105101098 A CN 105101098A CN 201410196914 A CN201410196914 A CN 201410196914A CN 105101098 A CN105101098 A CN 105101098A
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Abstract
The invention discloses an MANET physical layer synchronizing method and relates to a node inside an MANET system. By calculating the timing offsets with all surrounding adjacent nodes in the system, the node adjusts its own system timing and keeps synchronous to other nodes in the network system. The method is characterized in that it is agreed that timing of all nodes in the system is consistent; the node periodically sends synchronous and broadcast signals within an agreed time slot and further receives synchronous and broadcast signals from other nodes in agreed sending time slots of other nodes. The method comprises the following steps of calculating the timing offsets among the node and other adjacent nodes and informing other adjacent nodes of the information through a timing broadcast channel; and adjusting the system timing of the node according to the calculated timing offsets among the node and the other adjacent nodes and in line with a certain algorithm so as to make the node synchronous to other nodes in the network. By means of the methods, all nodes in the MANET can be kept synchronous with no dependence on other external signal sources. The system can achieve synchronization of all nodes therein in an independent way.
Description
Technical field
The present invention relates to wireless communication field, more specifically, relate to the method for the automatic completion system Timing Synchronization of multinode physical layer in wireless self-organization network.
Background technology
Wireless self-organization network and MANET (MobileAdHocNetwork) are a kind of technology being different from conventional wireless communication network.
Traditional wireless cellular communication network, needs the fixing network equipment, as the support of base station, carries out forwarding and user's Service controll of data.And wireless self-organization network does not need permanent plant support, the networking voluntarily of each node and user terminal.During communication, carried out the forwarding of data by other user nodes.This latticed form breaches the geographic limitations of conventional wireless cellular network, can quicker, convenient, dispose efficiently, be suitable for the communication needs of some urgent occasions, as individual soldier's communication system etc. in battlefield.But also there is the drawback that the network bandwidth is limited, poor to real-time service support, fail safe is not high in wireless self-organization network.At present, a large amount of researcher is had to carry out this project research both at home and abroad.
Wireless self-organization network is one and is formed by tens to up to a hundred nodes, adopted communication, the mobility peer-to-peer network of the multi-hop of dynamic group net.Its objective is the multimedia information stream by dynamic routing and mobile management technical transmission with quality of service requirement.
Wireless self-organization network is the Wireless Broadband MAN based on IP agreement, support multi-multipoint network structure, there is intelligent advantage and the features such as mobile broadband, wireless location such as MANET, selfreparing, multi-hop cascade, node self-management, be the network of a kind of Large Copacity, two-forty, wide coverage, become a kind of effective means of broadband access.Say in a sense, wireless self-organization network is a kind of network architecture thought more importantly, and major function is embodied in non-stop layer, MANET, multistage jumper connection and route and judges to select.
Wireless self-organization network is a kind of and the diverse new wireless networks technology of conventional wireless network.In traditional WLAN (wireless local area network) (WLAN), the wireless link accesses network that each client is all connected with access point (AP) by one, user is to intercom mutually, and first must access a fixing AP, this network configuration is called single-hop networks.And in wireless self-organization network, any wireless device node all can simultaneously as router, each node in network can send and Received signal strength, and each node can carry out direct communication with one or more peer node.
The largest benefit of this structure is: if nearest AP due to flow excessive and cause congested, the adjacent node that data can be automatically rerouted to communication flows less transmits.The rest may be inferred, and packet according to the situation of network, can also continue to be routed to next node nearest with it and transmit, until arrive final destination.Such access mode is exactly multi-hop access.
The Internet (Internet) that we know in fact is exactly the exemplary of a wireless self-organization network.When we send a Email, mail is not directly arrive in the mailbox of addressee, but is forwarded to another one server by router from a server, just arrives the mailbox of user through repeatedly routing forwarding.In repeating process, router generally understands the highest transmission path of efficiency of selection, to make Email can arrive the mailbox of user as early as possible.Therefore, wireless self-organization network can be regarded as " wireless version of the Internet ".
Summary of the invention
The wireless self-organization network physical layer synchronization method that the present invention relates to, under the scene not relying on external system timing source, can realize all node physical layer synchronization in system.
According to an aspect of the present invention, a kind of wireless self-organization network physical layer synchronization method is successively containing following steps:
In engagement system, all node timings are consistent,
Step (1) periodically sends synchronous and broadcast singal
In described wireless self-organization network, all nodes send synchronous and broadcast singal in its agreement time slot periodically;
Other synchronisation of nodes of step (2) periodic receipt and broadcast singal
In described wireless self-organization network, all nodes receive the synchronous and broadcast singal of all neighborss around it in agreement time slot periodically;
Step (3) broadcast timing offset information
In described wireless self-organization network, all nodes are by the timing offset information of its surrounding neighborss all with it calculated according to self timing ga(u)ge of its broadcast channel broadcasts;
Step (4) timing adjustment
The timing offset information relevant to himself that in described wireless self-organization network, all nodes are broadcasted according to all neighborss, and self calculate with the timing offset information of around all neighborss, timing adjustment values is calculated, adjustment System timing offset by certain algorithm.
According to a further aspect in the invention, described wireless self-organization network is when arranging the timing of all nodes and being consistent, utilize the timing offset information that around it, all neighborss calculate, and self calculate with the timing offset information of around all neighborss, by certain algorithm computing system timing adjustment values.
Accompanying drawing explanation
When Fig. 1 represents that radio self-organized network nodes of the present invention timing is consistent, propagation delay time calculates schematic diagram.
When Fig. 2 represents that radio self-organized network nodes of the present invention timing is inconsistent, propagation delay time calculates schematic diagram.
Fig. 3 represents wireless self-organization network frame structure schematic diagram of the present invention.
Embodiment
In order to reach object of the present invention, by the following technical solutions:
(1) in described wireless self-organization network, the timing of agreement all nodes is consistent.
(2) in described wireless self-organization network, all nodes are according to the timing of oneself in its agreement time slot, and periodicity sends synchronous and broadcast singal, as shown in Figure 3.The transmission position that each node has it independent, does not conflict mutually.
(3) in described wireless self-organization network, all nodes receive the synchronous of other all neighbors and broadcast singal in the agreement time slot of other node, and the timing according to oneself calculates its time side-play amount.Below illustrate in two kinds of situation:
(a) when the timing of all nodes is consistent, as shown in Figure 1.Node 1 and node 2 send synchronous and broadcast singal according to accurate timing in its agreement time slot, and carry out synchronous and broadcast signal reception at the sending time slots of other node.Now, the path delay of time 1 that node 2 calculates is completely equal with the path delay of time 2 that node 1 calculates, and is directly proportional to the distance between two nodes.
B (), when there is timing offset, node timing occurs inconsistent, as shown in Figure 2.Node 1 in its time slot according to the timed sending shifted to an earlier date synchronous and broadcast singal, and at the synchronous and broadcast singal that the sending time slots receiving node 2 of node 2 sends, now, due to the timing advance of node 1, the path delay of time 1 that node 2 calculates diminishes, and the path delay of time 2 that node 1 calculates becomes large, the Distance geometry timing offset of the path delay of time and two nodes has relation.
(4) path delay of time information relevant to himself broadcasted according to all neighborss of described wireless self-organization network interior nodes, and self calculate with the information in the path delay of time of around all neighborss, calculate timing adjustment values by certain algorithm, adjust the timing deviation of oneself.
Be more than physical layer Timing Synchronization computational methods example in a wireless self-organization network, any utilization described in accompanying drawing 1-3 is just sent out all at this patent protection range.
Claims (2)
1. a wireless self-organization network physical layer synchronization method, described method is successively containing following steps:
In engagement system, all node timings are consistent,
Step (1) periodically sends synchronous and broadcast singal
In described wireless self-organization network, all nodes send synchronous and broadcast singal in its agreement time slot periodically;
Other synchronisation of nodes of step (2) periodic receipt and broadcast singal
In described wireless self-organization network, all nodes receive the synchronous and broadcast singal of all neighborss around it in agreement time slot periodically;
Step (3) broadcast timing offset information
In described wireless self-organization network, all nodes are by the timing offset information of its surrounding neighborss all with it calculated according to self timing ga(u)ge of its broadcast channel broadcasts;
Step (4) timing adjustment
The timing offset information relevant to himself that in described wireless self-organization network, all nodes are broadcasted according to all neighborss, and self calculate with the timing offset information of around all neighborss, timing adjustment values is calculated, adjustment System timing offset by certain algorithm.
2. a kind of wireless self-organization network physical layer synchronization method according to claim 1, it is characterized in that: described wireless self-organization network is when arranging the timing of all nodes and being consistent, utilize the timing offset information that around it, all neighborss calculate, and self calculate with the timing offset information of around all neighborss, by certain algorithm computing system timing adjustment values.
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106535138A (en) * | 2016-11-11 | 2017-03-22 | 希诺麦田技术（深圳）有限公司 | Synchronization method and synchronization device for time division multiple access (TDMA) self-organizing network |
| RU2621604C1 (en) * | 2016-02-02 | 2017-06-06 | Федеральное государственное бюджетное образовательное учреждение высшего образования "Вятский государственный университет" | Control method of mobile self-organizing network topology |
| CN107371231A (en) * | 2016-05-13 | 2017-11-21 | 北京信威通信技术股份有限公司 | The synchronous method and device of wireless Mesh netword |
| CN109699071A (en) * | 2019-03-18 | 2019-04-30 | 辰芯科技有限公司 | Method for synchronizing time, system and the readable storage medium storing program for executing of self-organized network communication system |
| CN111050394A (en) * | 2017-03-15 | 2020-04-21 | Oppo广东移动通信有限公司 | Method and device for transmitting synchronization signals |
-
2014
- 2014-05-12 CN CN201410196914.XA patent/CN105101098A/en active Pending
Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| RU2621604C1 (en) * | 2016-02-02 | 2017-06-06 | Федеральное государственное бюджетное образовательное учреждение высшего образования "Вятский государственный университет" | Control method of mobile self-organizing network topology |
| CN107371231A (en) * | 2016-05-13 | 2017-11-21 | 北京信威通信技术股份有限公司 | The synchronous method and device of wireless Mesh netword |
| CN106535138A (en) * | 2016-11-11 | 2017-03-22 | 希诺麦田技术（深圳）有限公司 | Synchronization method and synchronization device for time division multiple access (TDMA) self-organizing network |
| CN106535138B (en) * | 2016-11-11 | 2020-01-07 | 希诺麦田技术（深圳）有限公司 | Synchronization method and device for time division multiple access self-organizing network |
| CN111050394A (en) * | 2017-03-15 | 2020-04-21 | Oppo广东移动通信有限公司 | Method and device for transmitting synchronization signals |
| CN111050394B (en) * | 2017-03-15 | 2021-03-09 | Oppo广东移动通信有限公司 | Method and device for transmitting synchronization signals |
| US11570772B2 (en) | 2017-03-15 | 2023-01-31 | Guangdong Oppo Mobile Telecommunications Corp., Ltd. | Method and device for transmitting synchronization signal |
| CN109699071A (en) * | 2019-03-18 | 2019-04-30 | 辰芯科技有限公司 | Method for synchronizing time, system and the readable storage medium storing program for executing of self-organized network communication system |
| CN109699071B (en) * | 2019-03-18 | 2021-03-16 | 辰芯科技有限公司 | Time synchronization method, system and readable storage medium for ad hoc network communication system |
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Application publication date: 20151125 |