CN117202335A - Timing synchronization method, device, equipment and storage medium between star ad hoc networks - Google Patents
Timing synchronization method, device, equipment and storage medium between star ad hoc networks Download PDFInfo
- Publication number
- CN117202335A CN117202335A CN202210598344.1A CN202210598344A CN117202335A CN 117202335 A CN117202335 A CN 117202335A CN 202210598344 A CN202210598344 A CN 202210598344A CN 117202335 A CN117202335 A CN 117202335A
- Authority
- CN
- China
- Prior art keywords
- star
- hoc network
- time slot
- target
- node
- 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.)
- Pending
Links
- 238000000034 method Methods 0.000 title claims abstract description 55
- 238000012423 maintenance Methods 0.000 claims abstract description 10
- 230000001360 synchronised effect Effects 0.000 claims description 10
- 230000003111 delayed effect Effects 0.000 claims description 6
- 238000004590 computer program Methods 0.000 claims description 3
- 238000010586 diagram Methods 0.000 description 9
- 238000002955 isolation Methods 0.000 description 5
- 230000005540 biological transmission Effects 0.000 description 3
- 238000004891 communication Methods 0.000 description 2
- 230000006870 function Effects 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000013500 data storage Methods 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000010295 mobile communication Methods 0.000 description 1
- 230000003287 optical effect Effects 0.000 description 1
- 230000008707 rearrangement Effects 0.000 description 1
- 230000011664 signaling Effects 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
Landscapes
- Mobile Radio Communication Systems (AREA)
Abstract
The embodiment of the invention discloses a timing synchronization method, a device, equipment and a storage medium between star ad hoc networks. The method comprises the steps of obtaining a target receiving time slot of a local node; carrying out channel estimation according to pilot symbols at different positions of a target receiving time slot, and obtaining each noise power value corresponding to each pilot symbol respectively; determining a target timing adjustment quantity of the star ad hoc network relative to the adjacent star ad hoc network in a preset statistical period according to each noise power value and a preset noise threshold value; and notifying the target timing adjustment amount to other nodes in the star ad hoc network so as to realize the timing synchronization maintenance between the star ad hoc network and the adjacent star ad hoc network. The technical scheme of the embodiment of the invention provides a timing synchronization method between star-type ad hoc networks, which is provided during and after network deployment, maintains the timing synchronization between networks and ensures that the networks do not interfere with each other.
Description
Technical Field
The embodiment of the invention relates to a star ad hoc network technology, in particular to a timing synchronization method, a device, equipment and a storage medium between star ad hoc networks.
Background
The mobile ad hoc network (Mobile Ad Hoc Network, MANET) is composed of a group of wireless mobile nodes, is a network system which does not depend on the existing fixed communication network infrastructure and can be rapidly unfolded and used, requires minimum manual intervention, and does not have any central entity, self-organization and self-healing network; each network node cooperates with each other, and communicates and exchanges information through a wireless link, so that information and service sharing is realized; network nodes are able to join and leave the network dynamically, randomly, frequently, without the need for prior alerting or notification, and most likely without disrupting communication with other nodes in the network.
The star-type ad hoc network system is one of topological structures of a mobile ad hoc network, covers a point-to-point system and a point-to-multipoint system, and comprises 1 central node and N access nodes, wherein the central node acts as a base station in the whole network, and the tasks of network distribution, broadcasting, forwarding, control and the like are completed. The access node acts as a terminal in the whole network to finish the tasks of network searching access, data receiving and transmitting, signal quality feedback and the like. The access node is equivalent to a user for the central node. Any node in the network may be a central node or an access node.
In practical network deployment applications, a plurality of star-shaped ad hoc network systems are often required to be erected, and a plurality of networks are respectively distributed and form a network. As shown in fig. 1a, the center node and the access node of one star ad hoc network are far apart, but the center node and the center node of the two star ad hoc networks are close to each other, and the access node are close to each other, when the working frequency points of the two networks are the same or the frequency point is close to the radio frequency isolation degree is insufficient, if the transceiving timing of the two networks is not synchronous, mutual interference exists between the center nodes and the access node of the two networks, so that normal operation cannot be performed.
Disclosure of Invention
The embodiment of the invention provides a timing synchronization method, a device, equipment and a storage medium between star ad hoc networks, and provides the timing synchronization method between the star ad hoc networks.
In a first aspect, an embodiment of the present invention provides a method for timing synchronization between star ad hoc networks, performed by a node in the star ad hoc network, where the method includes:
acquiring a target receiving time slot of a local node; the target receiving time slot is a time slot with signal interference when timing difference exists between the star-shaped ad hoc network and the adjacent star-shaped ad hoc network;
performing channel estimation according to pilot symbols at different positions of the target receiving time slot, and obtaining each noise power value corresponding to each pilot symbol;
determining a target timing adjustment amount of the star ad hoc network relative to the adjacent star ad hoc network in a preset statistical period according to the noise power values and a preset noise threshold value;
and notifying other nodes in the star ad hoc network of the target timing adjustment quantity so as to realize the maintenance of timing synchronization between the star ad hoc network and the adjacent star ad hoc network.
In a second aspect, the embodiment of the invention also provides a star-type ad hoc network system, which comprises a central node and at least one access node;
the central node or the access node is used for executing the timing synchronization method between the star ad hoc networks according to any embodiment of the invention;
the central node is further configured to perform a timing synchronization method between the star ad hoc networks before the target receiving time slot of the local node is acquired according to any embodiment of the present invention.
In a third aspect, an embodiment of the present invention further provides a timing synchronization apparatus between star ad hoc networks, performed by a node in the star ad hoc network, where the apparatus includes:
the target receiving time slot acquisition module is used for acquiring a target receiving time slot of the local node; the target receiving time slot is a time slot with signal interference when timing difference exists between the star-shaped ad hoc network and the adjacent star-shaped ad hoc network;
the noise power value acquisition module is used for carrying out channel estimation according to pilot symbols at different positions of the target receiving time slot to acquire each noise power value corresponding to each pilot symbol respectively;
the target timing adjustment quantity acquisition module is used for determining the target timing adjustment quantity of the star ad hoc network relative to the adjacent star ad hoc network in a preset statistical period according to the noise power values and the preset noise threshold value;
and the target timing adjustment quantity notification module is used for notifying the target timing adjustment quantity to other nodes in the star ad hoc network so as to realize the timing synchronization maintenance between the star ad hoc network and the adjacent star ad hoc network.
In a fourth aspect, an embodiment of the present invention further provides an electronic device, including:
one or more processors;
a storage means for storing one or more programs;
the one or more programs, when executed by the one or more processors, cause the one or more processors to implement a method for timing synchronization between star ad hoc networks according to any embodiment of the present invention.
In a fifth aspect, an embodiment of the present invention further provides a computer readable storage medium, where a computer program is stored, where the program when executed by a processor implements a method for timing synchronization between star-type ad hoc networks according to any embodiment of the present invention.
The embodiment of the invention obtains the target receiving time slot of the local node; carrying out channel estimation according to pilot symbols at different positions of a target receiving time slot, and obtaining each noise power value corresponding to each pilot symbol respectively; determining a target timing adjustment quantity of the star ad hoc network relative to the adjacent star ad hoc network in a preset statistical period according to each noise power value and a preset noise threshold value; the method is used for notifying other nodes in the star ad hoc network of the target timing adjustment quantity so as to realize the technical means of maintaining the timing synchronization between the star ad hoc network and the adjacent star ad hoc network, and solves the problem that the receiving and transmitting timings are asynchronous when the working frequency points of the two star ad hoc networks are the same or the frequency point is similar and the radio frequency isolation degree is insufficient in the prior art, so that the central nodes and the access nodes of the two star ad hoc networks are mutually interfered.
Drawings
FIG. 1a is a schematic diagram of interference in a prior art star ad hoc network;
fig. 1b is a flowchart of a timing synchronization method between star ad hoc networks according to a first embodiment of the present invention;
fig. 1c is a schematic diagram of transmit-receive interference between nodes in an application scenario according to a first embodiment of the present invention;
fig. 2 is a schematic structural diagram of a star-type ad hoc network system according to a second embodiment of the present invention;
fig. 3 is a schematic structural diagram of a timing synchronization device between star ad hoc networks according to a third embodiment of the present invention;
fig. 4 is a schematic structural diagram of an electronic device according to a fourth embodiment of the present invention.
Detailed Description
Embodiments of the present invention will be described in further detail below with reference to the drawings and examples. It should be understood that the particular embodiments described herein are illustrative only and are not limiting of embodiments of the invention. It should be further noted that, for convenience of description, only some, but not all of the structures related to the embodiments of the present invention are shown in the drawings.
Example 1
Fig. 1b is a flowchart of a timing synchronization method between star ad hoc networks according to a first embodiment of the present invention, where the embodiment is applicable to a case of synchronizing timings between a plurality of star ad hoc networks in a network deployment application, and the method may be performed by a timing synchronization device between the star ad hoc networks, and the device may be implemented by software and/or hardware and integrated in a node executing the method. Specifically, referring to fig. 1b, the method specifically comprises the steps of:
s110, acquiring a target receiving time slot of the local node.
The local node may be a central node or other access nodes in the star ad hoc network. The central node can be equivalent to a base station in the star ad hoc network, and can complete tasks such as network distribution, broadcasting, forwarding, control and the like. The access node can be equivalent to a terminal in the star ad hoc network, and the tasks of network searching access, data receiving and transmitting, signal quality feedback and the like are completed. The access node may be equivalent to a user for the central node. Any node in the star ad hoc network may be a central node or an access node.
The target receiving time slot may be a time slot in which signal interference exists when there is a timing difference between the star ad hoc network and an adjacent star ad hoc network. The adjacent star ad hoc network may refer to other star ad hoc networks which have the same working frequency point as the star ad hoc network or have similar frequency points and insufficient radio frequency isolation, and which are not synchronized with the star ad hoc network in timing to cause interference to the star ad hoc network.
Optionally, when the local node is a central node in the star ad hoc network, before acquiring the target receiving time slot of the local node, the method further includes:
detecting whether the adjacent star-shaped ad hoc network exists in a preset time range when starting up and searching the network; the central nodes in different star ad hoc networks have different starting times within a preset time range; if yes, current timing information of the central nodes in the adjacent star ad hoc network is obtained, and the timing information of the local nodes is synchronously adjusted according to the current timing information, so that the central nodes with delayed startup time can perform timing synchronization by referring to the central nodes with startup network deployment completed.
The preset time range may refer to a preset time range for searching the network from the starting time of the local node. The current timing information may refer to timing information when the neighbor star ad hoc network is detected.
In this embodiment, when the star ad hoc network is initially established, a central node (local node) starts up to perform network searching operation within a preset time range, searches for no other central node network distribution nearby, and if a network of other central nodes is successfully searched (i.e., an adjacent star ad hoc network is detected to exist within the preset time range), obtains current timing information of the central node in the adjacent star ad hoc network, and performs synchronous adjustment on the timing information of the local node according to the current timing information, realizes initial alignment with the timing of the adjacent star ad hoc network, and then switches to the network to complete establishment of the star ad hoc network; if no adjacent star ad hoc network is searched, no other central node is considered to be nearby, and the direct network distribution flow completes the establishment of the star ad hoc network.
It should be noted that, the access nodes are aligned in timing with the central node as a reference, and after the initial synchronization of the timing of the central nodes of the two star ad hoc networks is achieved, each access node also synchronizes to achieve the initial synchronization of the timing.
Optionally, acquiring current timing information of a central node in the adjacent star ad hoc network, and performing synchronization adjustment on the timing information of the local node according to the current timing information may include:
acquiring a first time point when the local node locally detects a synchronous signal sent by a central node in the adjacent star ad hoc network and a second time point when the central node in the adjacent star ad hoc network sends the synchronous signal; and according to the difference between the first time point and the second time point, aligning and adjusting the timing information of the local node by taking the current timing information of the central node in the adjacent star ad hoc network as a reference.
The first time point may refer to a time point when the local node locally detects a synchronization signal sent by a central node adjacent to the star ad hoc network. The second point in time may refer to a point in time when the central node itself in the neighboring star ad hoc network transmits a synchronization signal. Wherein "first" and "second" of the "first time point" and "second time point" are timing information for distinguishing different objects, i.e., distinguishing between a star ad hoc network and an adjacent star ad hoc network, and are not used for describing a specific order.
For example, the local node receives a segment of data of subframes 2-7, detects a synchronization signal sent by a central node in the adjacent star ad hoc network at symbol 1 of subframe 3, and sends the synchronization signal by itself at symbol 5 of subframe 0, which can calculate a timing deviation according to "subframe 3 symbol 1" and "subframe 0 symbol 5".
In this embodiment, a first time point when a local node locally detects a synchronization signal sent by a central node in an adjacent star ad hoc network and a second time point when the central node itself in the adjacent star ad hoc network sends the synchronization signal may be obtained; according to the difference between the first time point and the second time point, the timing information of the local node can be aligned and adjusted by taking the current timing information of the central node in the adjacent star ad hoc network as a reference.
Optionally, when the local node is an access node in the star ad hoc network, the star ad hoc network has performed an initial synchronization operation with an adjacent star ad hoc network in advance, and specifically reference is made to the foregoing operation performed before the target receiving time slot of the local node is acquired when the local node is a central node in the star ad hoc network, which is not described herein.
It should be noted that, as time increases, the timing of initial synchronization between the star ad hoc network and the adjacent star ad hoc network gradually shifts. Further consideration is therefore required to maintain timing synchronization of the two networks. Because the timing is not greatly deviated generally, if the timing is deviated to cause the interference between the star ad hoc network and the adjacent star ad hoc network, the timing is corrected at the initial stage, and the bad scene that the two networks generate strong interference for a long time can be avoided.
In an optional implementation manner of this embodiment, acquiring the target receiving timeslot of the local node may include:
when a first switching time point from a sending time slot of a local node to a receiving time slot is detected, acquiring a first receiving time slot positioned after the first switching time point as the target receiving time slot; and when a second switching time point of switching from the receiving time slot of the local node to the transmitting time slot is detected, acquiring a last receiving time slot positioned before the second switching time point as the target receiving time slot.
The first switching time point may refer to a switching time point when a transmission time slot of the local node is switched to a reception time slot. The second switching time point may refer to a switching time point at which the reception slot of the local node is switched to the transmission slot.
In this embodiment, for the star ad hoc network and the adjacent star ad hoc network having timing deviation, in order to keep the timings between the two consistent, the alignment may be unified for the network with slow timing or the alignment may be unified for the network with fast timing. If the unified alignment is to the network with slow timing, when a first switching time point from a sending time slot of a local node to a receiving time slot is detected, acquiring a first receiving time slot positioned after the first switching time point as the target receiving time slot; if the network alignment with fast timing is unified, when a second switching time point from the receiving time slot of the local node to the transmitting time slot is detected, the last receiving time slot before the second switching time point can be acquired as the target receiving time slot.
Fig. 1c is a schematic diagram illustrating a transceiver interference between nodes in an application scenario according to a first embodiment of the present invention. The configuration of the receiving and transmitting time slots of the star ad hoc network is the same as that of the adjacent star ad hoc network, but the timing is not synchronous, and the distance between the central node A of the star ad hoc network and the central node B of the adjacent star ad hoc network is very close, so that interference is generated between the central nodes A and B. As shown in FIG. 1c, center node A is clocked faster than center node B, at T 0 The central node A will be interfered by the tail transmitting signal of the transmitting time slot 0 of the central node B at the head of the receiving time slot 1; at T 1 In the stage, the central node B will be interfered by the signal transmitted by the head of the transmission slot 3 of the central node a at the tail of the reception slot 2. In order to keep the timing synchronization between networks, if the timing alignment to the network with slow timing (i.e. the timing alignment to the central node B) is unified, at this time, the central node a is used as the local node, and the receiving time slot 1 in the central node a is used as the target receiving time slot; if systemUpon a fast-timing network alignment (i.e., timing alignment to the hub node a), the hub node B acts as the local node and the receive slot 2 in the hub node B acts as the target receive slot.
S120, carrying out channel estimation according to pilot symbols at different positions of the target receiving time slot, and obtaining each noise power value corresponding to each pilot symbol.
Wherein the pilot symbols may refer to reference signals. For example, the target reception slot may be uniformly divided into 4 blocks, a first pilot symbol is set in a first divided slot, a second pilot symbol is set in a second divided slot, a third pilot symbol is set in a third divided slot, and a fourth pilot symbol is set in a fourth divided slot.
In this embodiment, channel estimation may be performed according to pilot symbols at different positions of the target receiving slot, so as to obtain each noise power value corresponding to each pilot symbol. In the previous example, the first noise power value, the second noise power value, the third noise power value, and the fourth noise power value may be obtained based on the first pilot symbol, the second pilot symbol, the third pilot symbol, and the fourth pilot symbol, respectively.
Specifically, channel estimation may be performed according to pilot symbols at different positions of the target receiving slot by a preset estimation algorithm, so as to obtain each noise power value corresponding to each pilot symbol.
The preset estimation algorithm may refer to an MMSE (Minimum Mean Square Error ) algorithm, a ZF (Zero forcing equalization) algorithm, an LSE (Least Square Estimate, least squares estimation) algorithm, and the like.
S130, determining a target timing adjustment quantity of the star ad hoc network relative to the adjacent star ad hoc network in a preset statistical period according to the noise power values and a preset noise threshold value.
The preset noise threshold value may refer to an upper limit value of each noise power value. The preset noise threshold may be 2 times the noise power value corresponding to the last pilot symbol in the target receiving slot (or an empirical value set based on the noise power value corresponding to the last pilot symbol). The reason is that: assuming that the timing does not deviate too much, the last pilot symbol is furthest from the target receive slot header and is theoretically least subject to interference. The preset statistics period may be a preset statistics time range for the target reception slot. The target receive time slots may be counted at least once in a preset counting period. The target timing adjustment may specify a time adjustment symbol number.
In this embodiment, the target timing adjustment amount of the star ad hoc network relative to the adjacent star ad hoc network may be determined in a preset statistical period according to each noise power value and a preset noise threshold value.
In an optional implementation manner of this embodiment, determining, in a preset statistical period, a target timing adjustment amount of the star ad hoc network relative to the adjacent star ad hoc network according to the noise power values and a preset noise threshold value includes:
determining pilot symbols with interference in pilot symbols at different positions of the target receiving time slot according to the noise power values and a preset noise threshold value; in a preset statistical period, calculating the average value of the pilot symbols with interference according to the statistical times of the target receiving time slots and the number of the pilot symbols with interference corresponding to each target receiving time slot; and determining the target timing adjustment quantity of the star ad hoc network relative to the adjacent star ad hoc network by the average value.
In this embodiment, for each counted target receiving slot in the preset counting period, it may be determined whether the noise power values corresponding to the pilot symbols at different positions exceed a preset noise threshold, and the pilot symbols corresponding to the noise power values exceeding the preset noise threshold are determined as the pilot symbols with interference, so as to obtain the number of the pilot symbols with interference in each target receiving slot. Further, according to the statistics times of the target receiving time slot in the preset statistics period, calculating an average value of pilot symbols with interference of the target receiving time slot in the preset statistics period, and determining the average value as a target timing adjustment quantity of the star ad hoc network relative to the adjacent star ad hoc network.
And S140, notifying the target timing adjustment amount to other nodes in the star ad hoc network so as to realize the maintenance of timing synchronization between the star ad hoc network and the adjacent star ad hoc network.
In this embodiment, the target timing adjustment amount may be notified to other nodes in the star ad hoc network through signaling or broadcasting, and a time is agreed to be adjusted together for effect, so as to achieve timing synchronization maintenance between the star ad hoc network and the adjacent star ad hoc network.
According to the technical scheme, the target receiving time slot of the local node is obtained; carrying out channel estimation according to pilot symbols at different positions of a target receiving time slot, and obtaining each noise power value corresponding to each pilot symbol respectively; determining a target timing adjustment quantity of the star ad hoc network relative to the adjacent star ad hoc network in a preset statistical period according to each noise power value and a preset noise threshold value; the method is used for notifying other nodes in the star ad hoc network of the target timing adjustment quantity so as to realize the technical means of maintaining the timing synchronization between the star ad hoc network and the adjacent star ad hoc network, and solves the problem that the receiving and transmitting timings are asynchronous when the working frequency points of the two star ad hoc networks are the same or the frequency point is similar and the radio frequency isolation degree is insufficient in the prior art, so that the central nodes and the access nodes of the two star ad hoc networks are mutually interfered.
Example two
Fig. 2 is a schematic structural diagram of a star-type ad hoc network system according to a second embodiment of the present invention, and taking 3 access nodes as an example, as shown in fig. 2, the system may include: central node 210, access node 220, access node 230, and access node 240.
The central node 210 or the access nodes 220, 230, 240 are configured to perform a timing synchronization method between the star ad hoc networks according to any embodiment of the present invention, including:
acquiring a target receiving time slot of a local node; the target receiving time slot is a time slot with signal interference when timing difference exists between the star-shaped ad hoc network and the adjacent star-shaped ad hoc network;
performing channel estimation according to pilot symbols at different positions of the target receiving time slot, and obtaining each noise power value corresponding to each pilot symbol;
determining a target timing adjustment amount of the star ad hoc network relative to the adjacent star ad hoc network in a preset statistical period according to the noise power values and a preset noise threshold value;
and notifying other nodes in the star ad hoc network of the target timing adjustment quantity so as to realize the maintenance of timing synchronization between the star ad hoc network and the adjacent star ad hoc network.
The central node 210 is further configured to perform a timing synchronization method between the star ad hoc networks before acquiring the target receiving timeslot of the local node according to any embodiment of the present invention, where the method includes:
before acquiring a target reception slot of a local node:
detecting whether the adjacent star-shaped ad hoc network exists in a preset time range when starting up and searching the network; the central nodes in different star ad hoc networks have different starting times within a preset time range;
if yes, current timing information of the central nodes in the adjacent star ad hoc network is obtained, and the timing information of the local nodes is synchronously adjusted according to the current timing information, so that the central nodes with delayed startup time can perform timing synchronization by referring to the central nodes with startup network deployment completed.
Example III
Fig. 3 is a schematic structural diagram of a timing synchronization device between star ad hoc networks according to a third embodiment of the present invention, where the device may be executed by a node in a star ad hoc network, and the device may execute the timing synchronization method between star ad hoc networks related to the above embodiments. Referring to fig. 3, the apparatus includes: a target reception slot acquisition module 310, a noise power value acquisition module 320, a target timing adjustment amount acquisition module 330, and a target timing adjustment amount notification module 340. Wherein:
a target receiving time slot obtaining module 310, configured to obtain a target receiving time slot of a local node; the target receiving time slot is a time slot with signal interference when timing difference exists between the star-shaped ad hoc network and the adjacent star-shaped ad hoc network;
a noise power value obtaining module 320, configured to perform channel estimation according to pilot symbols at different positions of the target receiving slot, and obtain each noise power value corresponding to each pilot symbol;
a target timing adjustment amount obtaining module 330, configured to determine a target timing adjustment amount of the star ad hoc network relative to the adjacent star ad hoc network in a preset statistical period according to the noise power values and a preset noise threshold value;
and a target timing adjustment amount notification module 340, configured to notify other nodes in the star ad hoc network of the target timing adjustment amount, so as to maintain timing synchronization between the star ad hoc network and the adjacent star ad hoc network.
According to the technical scheme, the target receiving time slot of the local node is obtained; carrying out channel estimation according to pilot symbols at different positions of a target receiving time slot, and obtaining each noise power value corresponding to each pilot symbol respectively; determining a target timing adjustment quantity of the star ad hoc network relative to the adjacent star ad hoc network in a preset statistical period according to each noise power value and a preset noise threshold value; the method is used for notifying other nodes in the star ad hoc network of the target timing adjustment quantity so as to realize the technical means of maintaining the timing synchronization between the star ad hoc network and the adjacent star ad hoc network, and solves the problem that the receiving and transmitting timings are asynchronous when the working frequency points of the two star ad hoc networks are the same or the frequency point is similar and the radio frequency isolation degree is insufficient in the prior art, so that the central nodes and the access nodes of the two star ad hoc networks are mutually interfered.
In the above apparatus, optionally, the target receive timeslot acquisition module 310 may specifically be configured to:
when a first switching time point from a sending time slot of a local node to a receiving time slot is detected, acquiring a first receiving time slot positioned after the first switching time point as the target receiving time slot;
and when a second switching time point of switching from the receiving time slot of the local node to the transmitting time slot is detected, acquiring a last receiving time slot positioned before the second switching time point as the target receiving time slot.
In the above apparatus, optionally, the noise power value obtaining module 320 may specifically be configured to:
and carrying out channel estimation according to pilot symbols at different positions of the target receiving time slot by a preset estimation algorithm, and obtaining each noise power value corresponding to each pilot symbol.
In the above apparatus, optionally, the target timing adjustment amount obtaining module 330 may specifically be configured to:
determining pilot symbols with interference in pilot symbols at different positions of the target receiving time slot according to the noise power values and a preset noise threshold value;
in a preset statistical period, calculating the average value of the pilot symbols with interference according to the statistical times of the target receiving time slots and the number of the pilot symbols with interference corresponding to each target receiving time slot;
and determining the target timing adjustment quantity of the star ad hoc network relative to the adjacent star ad hoc network by the average value.
In the above apparatus, optionally, the timing synchronization method between the star ad hoc networks may be specifically executed by a central node in the star ad hoc network;
prior to acquiring the target receive time slot for the local node, it may also include,
the adjacent star ad hoc network detection module is used for detecting whether the adjacent star ad hoc network exists in a preset time range when the start-up search is performed; the central nodes in different star ad hoc networks have different starting times within a preset time range;
and the timing information adjustment module is used for acquiring the current timing information of the central nodes in the adjacent star ad hoc network if yes, and synchronously adjusting the timing information of the local nodes according to the current timing information so as to enable the central nodes with the delayed startup time to perform timing synchronization by referring to the central nodes with the startup network deployment completed.
In the above apparatus, optionally, the timing information adjustment module may be specifically configured to:
acquiring a first time point when the local node locally detects a synchronous signal sent by a central node in the adjacent star ad hoc network and a second time point when the central node in the adjacent star ad hoc network sends the synchronous signal;
and according to the difference between the first time point and the second time point, aligning and adjusting the timing information of the local node by taking the current timing information of the central node in the adjacent star ad hoc network as a reference.
The timing synchronization device between the star ad hoc networks provided by the embodiment of the invention can execute the timing synchronization method between the star ad hoc networks provided by any embodiment of the invention, and has the corresponding functional modules and beneficial effects of the execution method.
Example IV
Fig. 4 is a schematic structural diagram of an electronic device according to a fourth embodiment of the present invention, and as shown in fig. 4, the electronic device includes a processor 410, a memory 420, an input device 430 and an output device 440; the number of processors 410 in the electronic device may be one or more, one processor 410 being taken as an example in fig. 4; the processor 410, memory 420, input device 430, and output device 440 in the electronic device may be connected by a bus or other means, for example in fig. 4.
The memory 420 is used as a computer readable storage medium, and may be used to store a software program, a computer executable program, and a module, such as program instructions/modules corresponding to a timing synchronization method between star ad hoc networks in an embodiment of the present invention (for example, the target receiving slot acquiring module 310, the noise power value acquiring module 320, the target timing adjustment amount acquiring module 330, and the target timing adjustment amount notifying module 340 in a timing synchronization device between star ad hoc networks). The processor 410 executes various functional applications and data processing of the electronic device by running software programs, instructions and modules stored in the memory 420, i.e. implementing the above-mentioned method for timing synchronization between the star ad hoc networks, which is executed by a node in the star ad hoc network, the method comprising:
acquiring a target receiving time slot of a local node; the target receiving time slot is a time slot with signal interference when timing difference exists between the star-shaped ad hoc network and the adjacent star-shaped ad hoc network;
performing channel estimation according to pilot symbols at different positions of the target receiving time slot, and obtaining each noise power value corresponding to each pilot symbol;
determining a target timing adjustment amount of the star ad hoc network relative to the adjacent star ad hoc network in a preset statistical period according to the noise power values and a preset noise threshold value;
and notifying other nodes in the star ad hoc network of the target timing adjustment quantity so as to realize the maintenance of timing synchronization between the star ad hoc network and the adjacent star ad hoc network.
The method is specifically executed by a central node in the star ad hoc network;
before acquiring the target receiving time slot of the local node, the method further comprises:
detecting whether the adjacent star-shaped ad hoc network exists in a preset time range when starting up and searching the network; the central nodes in different star ad hoc networks have different starting times within a preset time range;
if yes, current timing information of the central nodes in the adjacent star ad hoc network is obtained, and the timing information of the local nodes is synchronously adjusted according to the current timing information, so that the central nodes with delayed startup time can perform timing synchronization by referring to the central nodes with startup network deployment completed.
Memory 420 may include primarily a program storage area and a data storage area, wherein the program storage area may store an operating system, at least one application program required for functionality; the storage data area may store data created according to the use of the terminal, etc. In addition, memory 420 may include high-speed random access memory, and may also include non-volatile memory, such as at least one magnetic disk storage device, flash memory device, or other non-volatile solid-state storage device. In some examples, memory 420 may further include memory remotely located relative to processor 410, which may be connected to the electronic device via a network. Examples of such networks include, but are not limited to, the internet, intranets, local area networks, mobile communication networks, and combinations thereof.
The input device 430 may be used to receive input numeric or character information and to generate key signal inputs related to user settings and function control of the electronic device. The output 440 may include a display device such as a display screen.
Example five
A fifth embodiment of the present invention provides a computer readable storage medium having stored thereon a computer program which, when executed by a processor, is configured to perform a method for timing synchronization between star ad hoc networks, the method being performed by a node in the star ad hoc network, the method comprising:
acquiring a target receiving time slot of a local node; the target receiving time slot is a time slot with signal interference when timing difference exists between the star-shaped ad hoc network and the adjacent star-shaped ad hoc network;
performing channel estimation according to pilot symbols at different positions of the target receiving time slot, and obtaining each noise power value corresponding to each pilot symbol;
determining a target timing adjustment amount of the star ad hoc network relative to the adjacent star ad hoc network in a preset statistical period according to the noise power values and a preset noise threshold value;
and notifying other nodes in the star ad hoc network of the target timing adjustment quantity so as to realize the maintenance of timing synchronization between the star ad hoc network and the adjacent star ad hoc network.
The method is specifically executed by a central node in the star ad hoc network;
before acquiring the target receiving time slot of the local node, the method further comprises:
detecting whether the adjacent star-shaped ad hoc network exists in a preset time range when starting up and searching the network; the central nodes in different star ad hoc networks have different starting times within a preset time range;
if yes, current timing information of the central nodes in the adjacent star ad hoc network is obtained, and the timing information of the local nodes is synchronously adjusted according to the current timing information, so that the central nodes with delayed startup time can perform timing synchronization by referring to the central nodes with startup network deployment completed.
Of course, the storage medium containing the computer executable instructions provided in the embodiments of the present invention is not limited to the above-described method operations, and may also perform the related operations in the timing synchronization method between the star ad hoc networks provided in any embodiment of the present invention.
From the above description of embodiments, it will be clear to a person skilled in the art that the present invention may be implemented by means of software and necessary general purpose hardware, but of course also by means of hardware, although in many cases the former is a preferred embodiment. Based on such understanding, the technical solution of the present invention may be embodied essentially or in a part contributing to the prior art in the form of a software product, which may be stored in a computer readable storage medium, such as a floppy disk, a Read-Only Memory (ROM), a random access Memory (Random Access Memory, RAM), a FLASH Memory (FLASH), a hard disk or an optical disk of a computer, etc., and include several instructions for causing a computer device (which may be a personal computer, a server, or a network device, etc.) to execute the method according to the embodiments of the present invention.
It should be noted that, in the embodiment of the timing synchronization device between the star ad hoc networks, each unit and module included are only divided according to the functional logic, but not limited to the above-mentioned division, so long as the corresponding functions can be implemented; in addition, the specific names of the functional units are also only for distinguishing from each other, and are not used to limit the protection scope of the present invention.
Note that the above is only a preferred embodiment of the present invention and the technical principle applied. It will be understood by those skilled in the art that the present invention is not limited to the particular embodiments described herein, but is capable of various obvious changes, rearrangements and substitutions as will now become apparent to those skilled in the art without departing from the scope of the invention. Therefore, while the invention has been described in connection with the above embodiments, the invention is not limited to the embodiments, but may be embodied in many other equivalent forms without departing from the spirit or scope of the invention, which is set forth in the following claims.
Claims (10)
1. A method for timing synchronization between star ad hoc networks, performed by a node in a star ad hoc network, comprising:
acquiring a target receiving time slot of a local node; the local node refers to a central node or an access node in the star ad hoc network; the target receiving time slot is a time slot with signal interference when timing difference exists between the star ad hoc network and an adjacent star ad hoc network;
performing channel estimation according to pilot symbols at different positions of the target receiving time slot, and obtaining each noise power value corresponding to each pilot symbol;
determining a target timing adjustment amount of the star ad hoc network relative to the adjacent star ad hoc network in a preset statistical period according to the noise power values and a preset noise threshold value;
and notifying other nodes in the star ad hoc network of the target timing adjustment quantity so as to realize the maintenance of timing synchronization between the star ad hoc network and the adjacent star ad hoc network.
2. The method of claim 1, wherein obtaining the target receive time slot for the local node comprises:
when a first switching time point from a sending time slot of a local node to a receiving time slot is detected, acquiring a first receiving time slot positioned after the first switching time point as the target receiving time slot;
and when a second switching time point of switching from the receiving time slot of the local node to the transmitting time slot is detected, acquiring a last receiving time slot positioned before the second switching time point as the target receiving time slot.
3. The method of claim 1 wherein performing channel estimation based on pilot symbols at different positions of the target receive slot to obtain respective noise power values corresponding to the respective pilot symbols comprises:
and carrying out channel estimation according to pilot symbols at different positions of the target receiving time slot by a preset estimation algorithm, and obtaining each noise power value corresponding to each pilot symbol.
4. The method of claim 1, wherein determining a target timing adjustment for the star ad hoc network relative to the adjacent star ad hoc network over a predetermined statistical period based on the respective noise power values and a predetermined noise threshold value comprises:
determining pilot symbols with interference in pilot symbols at different positions of the target receiving time slot according to the noise power values and a preset noise threshold value;
in a preset statistical period, calculating the average value of the pilot symbols with interference according to the statistical times of the target receiving time slots and the number of the pilot symbols with interference corresponding to each target receiving time slot;
and determining the target timing adjustment quantity of the star ad hoc network relative to the adjacent star ad hoc network by the average value.
5. The method according to any of claims 1-4, characterized in that the method is performed in particular by a central node in the star ad hoc network;
before acquiring the target receiving time slot of the local node, the method further comprises:
detecting whether the adjacent star-shaped ad hoc network exists in a preset time range when starting up and searching the network; the central nodes in different star ad hoc networks have different starting times within a preset time range;
if yes, current timing information of the central nodes in the adjacent star ad hoc network is obtained, and the timing information of the local nodes is synchronously adjusted according to the current timing information, so that the central nodes with delayed startup time can perform timing synchronization by referring to the central nodes with startup network deployment completed.
6. The method of claim 1, wherein obtaining current timing information of a central node in the adjacent star ad hoc network and synchronously adjusting the timing information of the local node according to the current timing information comprises:
acquiring a first time point when the local node locally detects a synchronous signal sent by a central node in the adjacent star ad hoc network and a second time point when the central node in the adjacent star ad hoc network sends the synchronous signal;
and according to the difference between the first time point and the second time point, aligning and adjusting the timing information of the local node by taking the current timing information of the central node in the adjacent star ad hoc network as a reference.
7. A star ad hoc network system, comprising a central node and at least one access node;
the central node or the access node being configured to perform the timing synchronization method between the star ad hoc networks according to claims 1-4;
the central node is further configured to perform the timing synchronization method between the star ad hoc networks according to claims 5-6.
8. A timing synchronization apparatus between star ad hoc networks, performed by a node in the star ad hoc network, comprising:
the target receiving time slot acquisition module is used for acquiring a target receiving time slot of the local node; the target receiving time slot is a time slot with signal interference when timing difference exists between the star-shaped ad hoc network and the adjacent star-shaped ad hoc network;
the noise power value acquisition module is used for carrying out channel estimation according to pilot symbols at different positions of the target receiving time slot to acquire each noise power value corresponding to each pilot symbol respectively;
the target timing adjustment quantity acquisition module is used for determining the target timing adjustment quantity of the star ad hoc network relative to the adjacent star ad hoc network in a preset statistical period according to the noise power values and the preset noise threshold value;
and the target timing adjustment quantity notification module is used for notifying the target timing adjustment quantity to other nodes in the star ad hoc network so as to realize the timing synchronization maintenance between the star ad hoc network and the adjacent star ad hoc network.
9. An electronic device, the electronic device comprising:
one or more processors;
a storage means for storing one or more programs;
the one or more programs, when executed by the one or more processors, cause the one or more processors to implement a method of timing synchronization between a star ad hoc network as claimed in any one of claims 1 to 6.
10. A computer readable storage medium having stored thereon a computer program, which when executed by a processor implements a method of timing synchronization between a star ad hoc network according to any of claims 1-6.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210598344.1A CN117202335A (en) | 2022-05-30 | 2022-05-30 | Timing synchronization method, device, equipment and storage medium between star ad hoc networks |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210598344.1A CN117202335A (en) | 2022-05-30 | 2022-05-30 | Timing synchronization method, device, equipment and storage medium between star ad hoc networks |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN117202335A true CN117202335A (en) | 2023-12-08 |
Family
ID=89002126
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202210598344.1A Pending CN117202335A (en) | 2022-05-30 | 2022-05-30 | Timing synchronization method, device, equipment and storage medium between star ad hoc networks |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN117202335A (en) |
-
2022
- 2022-05-30 CN CN202210598344.1A patent/CN117202335A/en active Pending
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN106804058B (en) | clustering time synchronization method combined with topology maintenance | |
| KR101811359B1 (en) | Method and apparatus for transmitting d2d signals | |
| CN111279666B (en) | Apparatus and method for performing wireless communication in mesh network | |
| US11246080B2 (en) | Beaconing in small wavelength wireless networks | |
| US10051586B2 (en) | Terminal synchronization method and apparatus for use in wireless communication network | |
| US8885630B2 (en) | TDMA communications system with configuration beacon and associated method | |
| US20150071121A1 (en) | Systems and methods for concurrent service discovery and minimum spanning tree formation for service delivery | |
| US20130003654A1 (en) | Mesh Node Role Discovery and Automatic Recovery | |
| US10687309B2 (en) | Enhanced broadcast transmission in unslotted channel hopping medium access control | |
| KR20090033381A (en) | Tdma channel access scheduling with neighbor indirect acknowledgment algorithm(nbla) for ad-hoc networks | |
| CN113098674B (en) | Time synchronization method and system for data link terminal of high-speed carrier self-organizing network | |
| KR20120028290A (en) | Node in a wireless system and method for time and frequency synchronizing nodes in a wireless system | |
| WO2015151423A1 (en) | Wireless communication method | |
| US9544782B2 (en) | Systems, apparatus, and methods for range extension of wireless communication | |
| US20150341875A1 (en) | Method and terminal for synchronizing in distributed wireless communication | |
| JP2012124663A (en) | Radio communication system, radio communication method, and radio communication program | |
| Saravanan | An Efficient Multi Channel Query Scheduling In Wireless Sensor Networks | |
| CN117202335A (en) | Timing synchronization method, device, equipment and storage medium between star ad hoc networks | |
| CN109982428A (en) | Construct method, terminal, the network equipment and the synchronous network system of synchronizing network | |
| US8792463B2 (en) | Method for managing a distribution of bandwidth in a communications network, corresponding storage means and slave node | |
| JP7270774B2 (en) | Signaling methods for D2D synchronization | |
| CN112312390A (en) | Neighbor discovery method and system | |
| Alhalabi et al. | Performance analysis of the constructive interference flooding in wireless sensor networks | |
| KR102252729B1 (en) | Method and terminal for synchronizing in distributed wireless communication | |
| Wei et al. | A self-stabilized firefly synchronization method for the ISA100. 11a network |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination |