CN110581745B - Method and device for correcting time synchronization and frequency deviation of communication node - Google Patents
Method and device for correcting time synchronization and frequency deviation of communication node Download PDFInfo
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- CN110581745B CN110581745B CN201910863167.3A CN201910863167A CN110581745B CN 110581745 B CN110581745 B CN 110581745B CN 201910863167 A CN201910863167 A CN 201910863167A CN 110581745 B CN110581745 B CN 110581745B
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04J—MULTIPLEX COMMUNICATION
- H04J3/00—Time-division multiplex systems
- H04J3/02—Details
- H04J3/06—Synchronising arrangements
- H04J3/0635—Clock or time synchronisation in a network
- H04J3/0638—Clock or time synchronisation among nodes; Internode synchronisation
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L27/00—Modulated-carrier systems
- H04L27/0014—Carrier regulation
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L27/00—Modulated-carrier systems
- H04L27/0014—Carrier regulation
- H04L2027/0024—Carrier regulation at the receiver end
- H04L2027/0026—Correction of carrier offset
Abstract
The invention relates to a method and a device for correcting time synchronization and frequency deviation of a communication node. The method comprises the following steps: the method comprises the following steps: the slave node monitors and receives time broadcast of a plurality of proxy nodes, and establishes a proxy node list; step two: judging whether the time information from a plurality of proxy nodes can be put into a proxy node list or not; step three: putting the time information of a plurality of agent nodes into an agent node list; step four: judging whether the time broadcast reception is finished; step five: if the time broadcast is judged to be finished, judging whether the time information of the main agent node is received, otherwise, continuing the subsequent time broadcast of the plurality of agent nodes; step six: time synchronization and frequency offset correction are performed. The invention can realize high-efficiency and high-quality communication without external interference.
Description
Technical Field
The present invention relates generally to a method and apparatus for time synchronization and frequency offset correction for power line carrier communication, wireless communication, wired communication, and the like, and more particularly, to a method and apparatus for time synchronization and frequency offset correction between nodes participating in communication.
Background
In a system for communication by modulating a carrier, if the time between different communication nodes is not synchronous, the communication success rate is reduced, even the communication is completely impossible, so the time synchronization between the communication nodes and the consistency of the frequency of the used carrier have important significance in improving the communication success rate. Therefore, in order to correct time asynchronism and frequency deviation caused by crystal oscillator precision deviation of each node, time synchronization and frequency deviation correction are required to be performed on timing between nodes.
In a Communication system like Broadband Power Line Communication (BPL, IEEE1901.1), time information is put in a beacon frame from a central node (Coordinator), and self time information, such as the time when the beacon frame is sent, is sent to a child node in a periodic broadcast manner. And the child node corrects the time of the child node according to the received time information, calculates the frequency deviation between the child node and the coordinator, and corrects the signal transceiver of the child node. However, this technique has the following drawbacks: in an environment with interference, an environment with poor signal quality is likely to cause a beacon frame reception failure, and thus the frequency offset cannot be corrected.
The sub-node which completes the time synchronization and frequency deviation correction can also continue to broadcast the time information thereof so as to assist the sub-node which can not directly receive the coordinator broadcast to carry out the time synchronization and frequency deviation correction. These child nodes participating in the time broadcast may be referred to as proxy child nodes. Through the continuous broadcast of the coordinator and the agent child nodes, the time of the whole network can be synchronized, and the frequency deviation is limited to the minimum range. For a node, a reference node whose time synchronization and frequency offset correction is selected based on, for example, signal quality, communication success rate, etc., is referred to as a master proxy node. However, this technique has the following drawbacks: since only the master agent node is tracked, when the beacon frame from the master agent node is lost, the time synchronization and the frequency offset correction cannot be performed.
Unlike time synchronization, two time broadcast packets of the same node need to be received continuously for frequency offset correction. However, the communication is easily interfered by the environment, which results in the failure of receiving the data frame, especially in the environment of power line carrier communication and wireless communication. For example, a time broadcast packet selected as the master agent node in the previous cycle may occur, and may not be received in the present cycle. In a severe interference environment, this may result in that the frequency deviation of some nodes is not corrected for a long time, thereby affecting the communication success rate thereof. In addition, since the communication resources are occupied and the communication is not successful, the communication efficiency of the whole system is reduced.
Although those skilled in the art can solve the above problem by using different encoding methods for the header and body of the data frame in the communication system, for example, in order to improve the success rate of receiving the data frame. For example, the data frame header adopts a coding scheme (e.g., QPSK) with strong interference rejection and good error tolerance for frequency offset, and the data frame body adopts a coding scheme (e.g., 16QAM) with high transmission rate and high requirement for frequency offset, however, communication failure often exists.
Disclosure of Invention
In view of the above technical problems, the present invention is directed to a method and an apparatus for time synchronization and frequency offset correction, which can continuously perform time synchronization and frequency offset correction to improve a communication success rate in an environment with severe interference, especially in an environment with severe interference of co-frequency signals from other communication devices.
In order to achieve the above technical effects, the inventors of the present invention have found that the above technical problems can be solved by a method and apparatus for achieving high-efficiency and high-quality communication free from external interference.
According to the present invention, there is provided a method for correcting time synchronization and frequency deviation between communicating nodes, comprising the steps of:
the method comprises the following steps: the slave node monitors and receives time broadcast of a plurality of agent nodes, records local received time and establishes an agent node list;
step two: judging whether the time information from the plurality of proxy nodes can be put into the proxy node list or not;
step three: placing the time information of the plurality of proxy nodes into the proxy node list;
step four: judging whether the time broadcast reception is finished;
step five: if the time broadcast is judged to be completed in the fourth step, judging whether the time information of the main agent node is received, and if the time broadcast is judged to be not completed, continuing the subsequent time broadcast of the plurality of agent nodes;
step six: if the information of the master agent node is not received, reselecting the master agent node, and if the time information of the master agent node is received or the master agent node is reselected, performing time synchronization and frequency offset correction.
According to an embodiment of the present invention, the proxy node list is created by time information from a plurality of proxy nodes, and includes a current synchronization frame transmission time, a current synchronization frame reception time, a last synchronization frame reception time, and a last synchronization frame transmission time.
According to an embodiment of the present invention, the master broker node is selected from the list of broker nodes, and if the broker node in step three is the master broker node of the own node, the time synchronization and frequency offset correction operations may be performed immediately herein.
According to an embodiment of the present invention, when there is no master agent node, one of the agent node lists is selected as a master agent node, and time synchronization and frequency offset correction are performed according to the time information of the reselected master agent node.
According to one embodiment of the invention, the master proxy node is selected in accordance with the node that has the greatest signal strength of the received data frame, which may be based on the parent node on the communication path.
According to an embodiment of the present invention, the dynamic frequency deviation correction on a data frame by frame basis may further include:
step 1: judging whether the time information contains sending time or not for each received frame header;
step 2: if the sending time is included, proposing the sending time and local receiving time;
and step 3: if the sending time is not included, the data frame body is normally received;
and 4, step 4: calculating the frequency deviation of the data frame body and setting a receiver;
and 5: receiving a data frame body;
step 6: after the reception of the data frame body is completed, the frequency deviation is restored to the value before the setting.
According to an embodiment of the present invention, there is provided an apparatus for correcting time synchronization and frequency deviation between communicating nodes, including:
a first module: the slave node monitors and receives time broadcast of a plurality of agent nodes, records local received time and establishes an agent node list;
and a second module: judging whether the time information from the plurality of proxy nodes can be put into the proxy node list or not;
and a third module: placing the time information of the plurality of proxy nodes into the proxy node list;
and a module IV: judging whether the time broadcast reception is finished;
and a fifth module: if the time broadcast is judged to be finished in the module IV, judging whether the time information of the main agent node is received or not, and if the time broadcast is judged to be unfinished, continuing the subsequent time broadcast of the plurality of agent nodes;
and a module six: if the information of the master agent node is not received, reselecting the master agent node, and if the time information of the master agent node is received or the master agent node is reselected, performing time synchronization and frequency offset correction.
According to an embodiment of the present invention, the module six includes a dynamic frequency offset correction unit capable of performing frame-by-frame dynamic frequency offset correction on a data frame, and the dynamic frequency offset correction unit may perform the following operations:
step 1: judging whether the time information contains sending time or not for each received frame header;
step 2: if the sending time is included, proposing the sending time and local receiving time;
and step 3: if the sending time is not included, the data frame body is normally received;
and 4, step 4: calculating the frequency deviation of the data frame body and setting a receiver;
and 5: receiving a data frame body;
step 6: after the reception of the data frame body is completed, the frequency deviation is restored to the value before the setting.
Drawings
FIG. 1 is a schematic diagram of a time synchronization and frequency offset correction system of the present invention;
FIG. 2 is a flow chart of slave node time synchronization and frequency offset correction according to the present invention;
FIG. 3 is a flow chart of slave node dynamic frequency offset correction according to the present invention;
fig. 4 is a schematic diagram of a proxy node list according to the present invention.
Detailed Description
The technical purpose is realized by the following technical scheme:
a method for correcting time synchronization and frequency offset between communicating nodes is provided in which a slave node first listens to the time broadcast of a plurality of proxy nodes and records the time of its broadcast and the time of receipt of the broadcast packet from the node. The proxy node comprises a coordinator, the time broadcast comprises a time value of a time when the sending node starts to send the broadcast frame, and the broadcast packet comprises a time value of a header time when the receiving node receives the broadcast frame.
In order to save the storage space, only the received time information of a part of the proxy nodes may be recorded according to a certain selection principle, so as to form a proxy node list as shown in fig. 4. The selection principle may be, but is not limited to, signal strength of received data frames, hierarchical information in the network topology, etc.
In the proxy node list shown in fig. 4, one is determined as a master proxy node according to the proxy node selection principle. The proxy node selection principle may be, but is not limited to, a parent node on a communication path, a node with the highest signal strength of a received data frame, and the like. The parent node is its master proxy node, and the child nodes are nodes communicating with the proxy nodes. In the proxy node list, the time information of the proxy master node and other proxy nodes is periodically updated, and the transmission period is the update period of the proxy node because the time synchronization frame is periodically transmitted.
If the time information from the main agent node can not be received, one main agent node can be reselected according to the agent node selection principle to carry out time synchronization and frequency deviation correction.
Further, according to a preferred embodiment, the present invention may further include: the system of different coding modes is adopted for the data frame head and the data frame body, and the sending time information is carried in the frame head, so that the latest frequency deviation is calculated and used for receiving the data frame body, and the receiving success rate is improved.
In order to support the dynamic frequency offset calculation, corresponding receiving time information needs to be stored in the proxy node list. In the dynamic frequency offset correction, after the reception of one data frame is completed, the frequency offset needs to be restored to the original value.
Specifically, the method for correcting time synchronization and frequency offset between communicating nodes of the present invention is applied to time synchronization and frequency offset correction of a communication system by modulating a carrier, in which:
the slave node listens and receives time information from a plurality of proxy nodes, and establishes a proxy node list as shown in FIG. 4; selecting one slave node as a proxy master node based on the proxy node list; and performing time synchronization and frequency deviation correction according to the time information of the proxy master node, specifically, calculating a time deviation, writing the time deviation into a time deviation register, calculating a frequency deviation, and writing the frequency deviation into a frequency deviation register, wherein the adopted schematic formula is as follows:
time deviation is the sending time of the current synchronous frame and the receiving time of the current synchronous frame
Frequency deviation [ (present synchronization frame reception time-last synchronization frame reception time) - (present synchronization frame transmission time-last synchronization frame transmission time) ]/(present synchronization frame transmission time-last synchronization frame transmission time)
The selecting, by the slave node, a proxy master node from the proxy node list includes: according to the principle of setting the slave node, when the proxy master node does not exist, one of the proxy master nodes is selected from the proxy node list to be used as the proxy master node.
In addition, if the slave node does not receive the time information from the proxy master node, reselecting the proxy master node, including:
and according to the principle set by the slave node, selecting another node from the proxy node list as a proxy master node. And performing time synchronization and frequency deviation correction according to the time information of the reselected proxy master node.
Furthermore, if the header of the data frame received from the node contains time information, dynamic frequency offset correction can be performed, including: calculating frequency deviation correction according to the time information in the data frame header; the frequency offset correction is applied to reception of a frame body of the data frame.
And after the data frame body is received, restoring the frequency deviation to the original value.
In order to make the advantages and technical solutions of the present invention easier to understand, the technical solutions in the embodiments of the present invention are described in further detail below with reference to the drawings in the embodiments.
As shown in fig. 1 and 2, the method for correcting time synchronization and frequency deviation between communicating nodes of the present invention includes the steps of:
step 201: monitoring and receiving time broadcast of a plurality of agent nodes, and simultaneously recording the locally received time;
step 202: it is determined whether the time information from the above proxy node is put in the proxy node list shown in fig. 4 (to clarify the details of the proxy node: see fig. 4). The judgment can be based on, but not limited to, the signal strength of the data frame, the hierarchy information in the network topology (if possible, the design of the hierarchy information indicates that the number of nodes that need to pass through when communicating with the central node is the hierarchy), and the like. Time information from all proxy nodes may also be saved if the slave node has sufficient memory.
Step 204: it is judged whether the time broadcast reception is completed (the judgment is made according to what is: the transmission time of all the proxy nodes is finished and is considered to be completed). If not, the time broadcast of the subsequent proxy node is continuously received. If it has, step 205 is performed.
Step 205: whether the corresponding row of the table of fig. 4 is updated to determine whether the time information of the proxy master node is received.
Step 206: and if the information of the proxy main node is not received, reselecting the proxy main node. The selection may be based on, but is not limited to, a parent node on the communication path, a node that receives the data frame with the greatest signal strength, etc.
Step 207: if the time information of the proxy master node is received or the proxy master node is reselected, time synchronization and frequency offset correction are performed.
If the node also needs to broadcast the proxy time information, before transmission, steps 205, 206, and 207 may be performed in advance even if the reception is not completed as a result of the determination in step 204. The time information sent by the node is ensured to be synchronized.
The broadcast information described herein may be, but is not limited to, a beacon frame, a data frame of a local broadcast or a full network broadcast.
Further, as shown in fig. 3, the data frame may be subjected to dynamic frequency offset correction frame by frame:
step 301: and judging whether the sending time information is contained or not for each received frame header.
Step 302: if the sending time is contained, the sending time and the local receiving time are proposed.
Step 303: if the transmission time is not included, the data frame body is normally received.
Step 304: the frequency offset of the frame is calculated and the receiver is set up.
Step 305: a data frame body is received.
Step 306: after the reception of the data frame body is completed, the frequency deviation is restored to the value before the setting.
Some embodiments have been described in connection with the accompanying drawings. The figures are merely schematic representations, and such proportions are not intended to be limiting, as components and steps may be added, removed and/or rearranged without departing from the spirit of the claims. In addition, any specific features, aspects, methods, characteristics, properties, qualities, attributes, elements, etc. associated with the various embodiments disclosed herein may be used in all other embodiments set forth herein. Additionally, it should be recognized that any of the methods described herein may be practiced using any apparatus suitable for performing the recited steps.
Although several embodiments and variations thereof have been described in detail, other modifications and methods of using them will be apparent to those skilled in the art. Therefore, it should be understood that equivalents may be constructed of various applications, modifications, materials, and substitutions without departing from the scope of the unique and inventive disclosure or claims herein.
Claims (8)
1. A method for correcting time synchronization and frequency offset between communicating nodes, comprising the steps of:
the method comprises the following steps: the slave node monitors and receives time broadcast of a plurality of agent nodes, records local received time and establishes an agent node list;
step two: judging whether the time information from the plurality of proxy nodes can be put into the proxy node list or not;
step three: placing the time information of the plurality of proxy nodes into the proxy node list;
step four: judging whether the time broadcast reception is finished;
step five: if the time broadcast is judged to be completed in the fourth step, judging whether the time information of the main agent node is received, and if the time broadcast is judged to be not completed, continuing the subsequent time broadcast of the plurality of agent nodes;
step six: if the information of the master agent node is not received, reselecting the master agent node, and if the time information of the master agent node is received or the master agent node is reselected, performing time synchronization and frequency offset correction.
2. The method of claim 1, wherein the proxy node list is created by time information from a plurality of proxy nodes, and includes a current sync frame transmission time, a current sync frame reception time, a last sync frame reception time, and a last sync frame transmission time.
3. The method of claim 1, wherein the master broker node is selected from the list of broker nodes, and wherein the time synchronization and frequency offset correction operations are performed on-the-fly if the broker node in step three is the master broker node of the node.
4. The method of claim 1, wherein in the absence of said master agent node, selecting one of said list of agent nodes as a master agent node,
and carrying out time synchronization and frequency deviation correction according to the time information of the reselected master agent node.
5. The method of claim 4, wherein the master proxy node is selected based on the node having the greatest signal strength of the received data frame based on the parent node on the communication path.
6. The method of claim 1, wherein the dynamic frequency offset correction on a frame-by-frame basis is performed on a data frame, comprising
Step 1: judging whether the time information contains sending time or not for each received frame header;
step 2: if the sending time is contained, extracting the sending time and local receiving time;
and step 3: if the sending time is not included, normally receiving a data frame body;
and 4, step 4: calculating the frequency deviation of the data frame body and setting a receiver;
and 5: receiving the data frame body;
step 6: and restoring the frequency deviation to the value before setting when the data frame body is received.
7. An apparatus for correcting time synchronization and frequency offset between communicating nodes, comprising:
a first module: the slave node monitors and receives time broadcast of a plurality of agent nodes, records local received time and establishes an agent node list;
and a second module: judging whether the time information from the plurality of proxy nodes can be put into the proxy node list or not;
and a third module: placing the time information of the plurality of proxy nodes into the proxy node list;
and a module IV: judging whether the time broadcast reception is finished;
and a fifth module: if the time broadcast is judged to be finished in the module IV, judging whether the time information of the main agent node is received or not, and if the time broadcast is judged to be unfinished, continuing the subsequent time broadcast of the plurality of agent nodes;
and a module six: if the information of the master agent node is not received, reselecting the master agent node, and if the time information of the master agent node is received or the master agent node is reselected, performing time synchronization and frequency offset correction.
8. The apparatus of claim 7, wherein the sixth module comprises a dynamic frequency offset modification unit capable of performing frame-by-frame dynamic frequency offset modification on a data frame, and the dynamic frequency offset modification unit is capable of performing the following operations:
step 1: judging whether the time information contains sending time or not for each received frame header;
step 2: if the sending time is contained, extracting the sending time and local receiving time;
and step 3: if the sending time is not included, normally receiving a data frame body;
and 4, step 4: calculating the frequency deviation of the data frame body and setting a receiver;
and 5: receiving the data frame body;
step 6: and restoring the frequency deviation to the value before setting when the data frame body is received.
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