CN109412677B - Communication broadcast self-adaptive fusion method in satellite-ground cooperative block chain system - Google Patents
Communication broadcast self-adaptive fusion method in satellite-ground cooperative block chain system Download PDFInfo
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B7/00—Radio transmission systems, i.e. using radiation field
- H04B7/14—Relay systems
- H04B7/15—Active relay systems
- H04B7/185—Space-based or airborne stations; Stations for satellite systems
- H04B7/1851—Systems using a satellite or space-based relay
- H04B7/18513—Transmission in a satellite or space-based system
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B7/00—Radio transmission systems, i.e. using radiation field
- H04B7/14—Relay systems
- H04B7/15—Active relay systems
- H04B7/185—Space-based or airborne stations; Stations for satellite systems
- H04B7/18578—Satellite systems for providing broadband data service to individual earth stations
- H04B7/18586—Arrangements for data transporting, e.g. for an end to end data transport or check
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L1/00—Arrangements for detecting or preventing errors in the information received
- H04L1/12—Arrangements for detecting or preventing errors in the information received by using return channel
- H04L1/16—Arrangements for detecting or preventing errors in the information received by using return channel in which the return channel carries supervisory signals, e.g. repetition request signals
- H04L1/18—Automatic repetition systems, e.g. Van Duuren systems
- H04L1/1867—Arrangements specially adapted for the transmitter end
- H04L1/188—Time-out mechanisms
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W28/00—Network traffic management; Network resource management
- H04W28/02—Traffic management, e.g. flow control or congestion control
- H04W28/04—Error control
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W4/00—Services specially adapted for wireless communication networks; Facilities therefor
- H04W4/06—Selective distribution of broadcast services, e.g. multimedia broadcast multicast service [MBMS]; Services to user groups; One-way selective calling services
Abstract
The embodiment of the invention provides a communication broadcast self-adaptive fusion method in a satellite-ground cooperative block chain system, which comprises the following steps: the target common node broadcasts target data generated by the target common node, timing is started, so that the first neighbor node continuously broadcasts the target data, the first gateway node sends the target data to the satellite, and the satellite performs whole-network broadcasting on the target data; after the preset time, if the target common node does not receive the target data of the satellite broadcast, the target common node sends the target data to the first gateway node again so that the first gateway node sends the target data to the satellite again, and the satellite broadcasts the whole network again. The communication broadcast self-adaptive fusion method in the satellite-ground cooperative block chain system provided by the embodiment of the invention can carry out cooperative scheduling self-adaptive retransmission broadcast through the ground node and the satellite, and can effectively utilize the high efficiency of the satellite large-range broadcast and the flexibility of ground network transmission, thereby meeting the requirements of the block chain system on high speed, reliability and whole network synchronization of the communication system.
Description
Technical Field
The embodiment of the invention relates to the technical field of communication, in particular to a communication broadcast self-adaptive fusion method in a satellite-ground cooperative block chain system.
Background
The blockchain is a technology for establishing a distributed digital account book system based on a point-to-point transmission network technology, a cryptography technology, a database storage technology, a consensus mechanism and the like. Since the point-to-point transmission of the existing blockchain system is a protocol established on an application layer, transaction broadcast and blockchain broadcast in the blockchain system require data transmission once for each node, which will bring a great burden to the network, and network congestion is likely to occur in the case of frequent transactions. Under the index of measuring the performance of the blockchain system by the number of transactions in unit time, the throughput of the blockchain system is determined by the number of transactions contained in a single block and the delay of the block to realize the whole network broadcasting. Under the existing internet architecture, certain time is required for each transaction of the block chain or for generating a new block to realize the whole network broadcasting, so the transaction speed of the block chain system is seriously influenced by the existing network transmission technology.
In the prior art, a block chain system composed of a satellite and a ground node is called a satellite-ground cooperative block chain system, in the system, the broadcasting of blocks and transactions is generally performed by adopting satellite communication, and the rapid whole-network broadcasting of information is realized by utilizing the characteristics of wide coverage range and broadcasting of the satellite communication.
However, with satellite broadcasting, due to the difference in time and space of the communication channels, some nodes may lose some broadcast information or receive wrong broadcast information. The satellite-ground cooperative block chain system cannot work normally or the system efficiency is low, and the system reliability is low.
Disclosure of Invention
It is an object of embodiments of the present invention to provide an adaptive convergence method for communication broadcast in a satellite-to-ground coordinated blockchain system that overcomes or at least partially solves the above mentioned problems.
In order to solve the foregoing technical problem, in one aspect, an embodiment of the present invention provides a communication broadcast adaptive fusion method in a satellite-ground cooperative blockchain system, including:
the method comprises the steps that a target common node broadcasts target data generated by the target common node, timing is started, so that a first neighbor node continuously broadcasts the target data, a first gateway node sends the target data to a satellite, and the satellite broadcasts the target data in a whole network;
after a preset time, if the target common node does not receive the target data broadcasted by the satellite, the target data is sent to the first gateway node again, so that the first gateway node sends the target data to the satellite again, and the satellite broadcasts the target data in the whole network again.
The communication broadcast self-adaptive fusion method in the satellite-ground cooperative block chain system provided by the embodiment of the invention can carry out cooperative scheduling self-adaptive retransmission broadcast through the ground node and the satellite, and can effectively utilize the high efficiency of the satellite large-range broadcast and the flexibility of ground network transmission, thereby meeting the requirements of the block chain system on high speed, reliability and whole network synchronization of the communication system.
Drawings
Fig. 1 is a schematic diagram illustrating a communication broadcast adaptive fusion method in a satellite-ground cooperative blockchain system according to an embodiment of the present invention;
fig. 2 is a schematic logic flow diagram of a general node retransmission transaction according to an embodiment of the present invention;
fig. 3 is a schematic logic flow diagram of a general node retransmission block according to an embodiment of the present invention;
fig. 4 is a schematic diagram of a transmission logic flow after a common node receives a block sent by the common node according to an embodiment of the present invention;
fig. 5 is a schematic diagram of a transmission logic flow after a gateway node receives a transaction sent by a common node according to an embodiment of the present invention;
fig. 6 is a schematic diagram of a transmission logic flow after a gateway node receives a block sent by a common node according to an embodiment of the present invention;
fig. 7 is a schematic diagram illustrating a transmission logic flow after a gateway node receives a transaction of a satellite broadcast according to an embodiment of the present invention;
fig. 8 is a schematic diagram illustrating a logic flow of transmission after a gateway node receives a block of a satellite broadcast according to an embodiment of the present invention;
fig. 9 is a schematic diagram illustrating a logic flow of transmission after a gateway node receives a block request according to an embodiment of the present invention;
fig. 10 is a schematic diagram illustrating a transmission logic flow after a transaction sent by a gateway node is received by a satellite according to an embodiment of the present invention;
fig. 11 is a schematic diagram illustrating a logic flow of transmission after a satellite receives a block sent by a gateway node according to an embodiment of the present invention;
fig. 12 is a schematic diagram of a communication broadcast adaptive fusion apparatus in a satellite-ground cooperative blockchain system according to an embodiment of the present invention;
fig. 13 is a schematic structural diagram of an electronic device according to an embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments of the present invention without making any creative effort, shall fall within the protection scope of the present invention.
Fig. 1 is a schematic diagram of a communication broadcast adaptive fusion method in a satellite-ground cooperative blockchain system according to an embodiment of the present invention, and as shown in fig. 1, the embodiment of the present invention provides a communication broadcast adaptive fusion method in a satellite-ground cooperative blockchain system, where the method includes:
step S101, a target common node broadcasts target data generated by the target common node and starts timing to enable a first neighbor node to continuously broadcast the target data, so that a first gateway node sends the target data to a satellite, and the satellite broadcasts the target data in the whole network;
step S102, after a preset time, if the target common node does not receive the target data broadcasted by the satellite, re-sending the target data to the first gateway node, so that the first gateway node sends the target data to the satellite again, and the satellite broadcasts the target data over the whole network again.
Specifically, the satellite-ground cooperative block chain system comprises a plurality of common nodes for running a block chain program, a point-to-point network is formed between the common nodes through the internet, each common node is provided with a neighbor node, the neighbor nodes are also common nodes, and a pair of neighbor nodes can perform data transmission through the internet. Meanwhile, the satellite-ground collaborative block chain system further comprises a satellite and a plurality of gateway nodes, the satellite comprises a satellite main body and a ground main station, the satellite main body orbits the earth in the air according to a preset orbit, the gateway nodes can communicate with the ground main station through a ground network, and the ground main station can send data to the satellite main body. The satellite agent may broadcast information to all nodes (including the general nodes and the gateway nodes), and each node (including the general nodes and the gateway nodes) may receive the wireless broadcast information of the satellite. After the common node is accessed to the network, a certain number of neighbor nodes are locally stored, and the common node can be accessed to a gateway node with the optimal transmission path. The gateway node is capable of communicating with a ground master station of the satellite. The gateway nodes may communicate with each other.
The gateway node and the satellite ground master station respectively store a data cache, called local cache, in the local cache, the received data and the priority of the data are stored, and the data can be sent out according to the priority of the data, wherein the data can be transactions or blocks. The priority of the cached data can be measured by the priority value, and the higher the priority value is, the higher the priority of the data will be sent out from the local cache preferentially.
The common node is provided with a buffer area for sending data locally, when a target common node generates target data locally, the target data is sent to the first neighbor node and the first gateway node in a broadcasting mode, and timing is started at the same time. The first neighbor node is a neighbor node of the target ordinary node, and the first gateway node is a gateway node which is accessed to the network by the target ordinary node and has an optimal transmission path with the first gateway node. The first neighbor node continues to broadcast the target data, the first gateway node sends the target data to the satellite, and the satellite broadcasts the target data in the whole network.
After the preset time, if the target common node does not receive the target data of the satellite broadcast, the target data is sent to the first gateway node again, so that the first gateway node sends the target data to the satellite again, the satellite broadcasts the target data in the whole network again, and the process is repeated until the target common node receives the target data of the satellite broadcast. The preset time can be configured according to actual conditions.
And if the target common node receives the target data broadcasted by the satellite, the data is considered to be successfully transmitted and is not retransmitted.
Fig. 2 is a schematic logic flow diagram of a normal node retransmission transaction according to an embodiment of the present invention, and as shown in fig. 2, taking data retransmitted by a normal node as an example of a transaction, after a new transaction a is locally generated by a normal node a1, the transaction a is sent to a neighboring node a2 and a gateway node B1 in a broadcast manner, and timing is started at the same time. The neighbor node a2 is a neighbor node of the ordinary node a1, and the gateway node B1 is a gateway node of the ordinary node a1 accessing the network and having an optimal transmission path with itself. For the neighbor node a2 to continue broadcasting the transaction a, and for the gateway node B1 to send the transaction a to the satellite, which broadcasts the transaction a over the network.
After the preset time, for example, after 2 seconds, if the ordinary node a1 determines that the transaction a broadcasted by the satellite is not received, the transaction a is sent to the gateway node B1 again, so that the gateway node B1 sends the transaction a to the satellite again, the satellite broadcasts the transaction a all over the network again, and the process is repeated until the ordinary node a1 receives the transaction a broadcasted by the satellite.
Fig. 3 is a logic flow diagram of a normal node retransmission block according to an embodiment of the present invention, and as shown in fig. 3, taking data retransmitted by a normal node as a block as an example, if a new block a is locally generated by a normal node a1, the normal node a1 sends the block a to a neighboring node a2 and a gateway node B1 in a broadcast manner, and starts timing at the same time.
After 2 seconds, if the regular node a1 determines that the block a of the satellite broadcast is not received, the block a is retransmitted to the gateway node B1, so that the gateway node B1 retransmits the block a to the satellite, and the satellite performs the full-network broadcast on the block a again, and the process is repeated until the regular node a1 receives the block a of the satellite broadcast.
The communication broadcast self-adaptive fusion method in the satellite-ground cooperative block chain system provided by the embodiment of the invention can carry out cooperative scheduling self-adaptive retransmission broadcast through the ground node and the satellite, and can effectively utilize the high efficiency of the satellite large-range broadcast and the flexibility of ground network transmission, thereby meeting the requirements of the block chain system on high speed, reliability and whole network synchronization of the communication system.
On the basis of the above embodiment, further, when the target data is a target transaction, after the first neighboring node receives the target transaction broadcast by the target ordinary node, the following steps are performed:
verifying the validity of the target transaction;
and if the verification is passed, adding the target transaction into a local transaction pool, otherwise, discarding the target transaction.
Specifically, when the target data is a target transaction, after the first neighboring node receives the target transaction broadcast by the target common node, the following steps are executed:
first, the target transaction is validated for validity.
And if the verification is passed, adding the target transaction into a local transaction pool, otherwise, discarding the target transaction.
For example, in the example of the above embodiment, the neighbor node a2 verifies the validity of the transaction a after receiving the transaction a broadcast by the normal node a1, and if the verification is passed, the transaction a is added to the local transaction pool, otherwise, the transaction a is discarded.
The communication broadcast self-adaptive fusion method in the satellite-ground cooperative block chain system provided by the embodiment of the invention can carry out cooperative scheduling self-adaptive retransmission broadcast through the ground node and the satellite, and can effectively utilize the high efficiency of the satellite large-range broadcast and the flexibility of ground network transmission, thereby meeting the requirements of the block chain system on high speed, reliability and whole network synchronization of the communication system.
On the basis of the foregoing embodiments, further, when the target data is a target block, after the first neighboring node receives the target block broadcast by the target ordinary node, the following steps are performed:
verifying the legality of the target block;
if the verification is passed, judging whether a missing block exists according to the numbers of other blocks stored in the local database and the number of the target block;
and if the missing blocks exist, sending a block request to a second neighbor node and a second gateway node to acquire the missing blocks.
Specifically, fig. 4 is a schematic diagram of a transmission logic flow after a common node receives a block sent by the common node according to an embodiment of the present invention, and as shown in fig. 4, when target data is a target block, a first neighboring node receives the target block broadcasted by the target common node, and then performs the following steps:
first, the target block is verified for validity.
If the verification is passed, judging whether a missing block exists according to the numbers of other blocks stored in the local database and the number of the target block.
And if the missing blocks exist, sending a block request to a second neighbor node and a second gateway node to acquire the missing blocks. The second neighbor node is a neighbor node of the first neighbor node, and the second gateway node is a gateway node which is accessed to the network by the second neighbor node and has an optimal transmission path with the second neighbor node.
For example, in the example of the above embodiment, the neighbor node a2 verifies the validity of the block a after receiving the block a broadcast by the regular node a1, and if the verification is passed, the block a is saved in the local database.
If the block a has a number of 8 and the other blocks stored in the local database of the neighboring node a2 have numbers of: "1, 2, 3, 4, 5, 6", since the numbers of the blocks are arranged in a certain order, after the neighboring node a2 receives the block a, it can determine the lack of the block with the number of 7 according to the numbers of other blocks and the number of the block a stored in the local database.
At this point, neighbor node A2 then sends a chunk request to neighbor node A3 and gateway node B2 to obtain the missing chunk numbered 7. The neighbor node A3 is a neighbor node of the neighbor node a2, and the gateway node B2 is a gateway node which is accessed to the network by the neighbor node a2 and has an optimal transmission path with itself.
The communication broadcast self-adaptive fusion method in the satellite-ground cooperative block chain system provided by the embodiment of the invention can carry out cooperative scheduling self-adaptive retransmission broadcast through the ground node and the satellite, and can effectively utilize the high efficiency of the satellite large-range broadcast and the flexibility of ground network transmission, thereby meeting the requirements of the block chain system on high speed, reliability and whole network synchronization of the communication system.
On the basis of the foregoing embodiments, further, when the target data is a target transaction, after the first gateway node receives the target transaction broadcast by the target ordinary node, the following steps are performed:
checking whether the target transaction exists in a local cache;
if the target transaction does not exist, the target transaction is stored in a local database, the target transaction is added into a local cache, and the priority value of the target transaction in the local cache is set as a first preset value GTN.
Specifically, fig. 5 is a schematic diagram of a transmission logic flow after a gateway node receives a transaction sent by a common node according to an embodiment of the present invention, and as shown in fig. 5, when target data is a target transaction, a first gateway node receives the target transaction broadcast by the target common node, and then executes the following steps:
first, it is checked whether the target transaction is in the local cache.
If the target transaction does not exist, the target transaction is stored in a local database, the target transaction is added into a local cache, and the priority value of the target transaction in the local cache is set as a first preset value GTN.
For example, in the example of the above embodiment, the gateway node B1, upon receiving transaction a broadcast by regular node a1, checks whether there is transaction a in the local cache.
If transaction A does not exist, transaction A is saved in a local database, transaction A is added into a local cache, and the priority value of transaction A in the local cache is set to GTN, wherein GTN is 254.
The communication broadcast self-adaptive fusion method in the satellite-ground cooperative block chain system provided by the embodiment of the invention can carry out cooperative scheduling self-adaptive retransmission broadcast through the ground node and the satellite, and can effectively utilize the high efficiency of the satellite large-range broadcast and the flexibility of ground network transmission, thereby meeting the requirements of the block chain system on high speed, reliability and whole network synchronization of the communication system.
On the basis of the foregoing embodiments, further, when the target data is a target block, after the first gateway node receives the target block broadcast by the target normal node, the following steps are performed:
storing the target block into a local database, adding the target block into a local cache, and setting the priority value of the target block in the local cache as a second preset value GBN;
judging whether a missing block exists according to the numbers of other stored blocks in a local database and the number of the target block;
if there is a missing block, a block request is sent to the second gateway node to obtain the missing block.
Specifically, fig. 6 is a schematic diagram of a transmission logic flow after a gateway node receives a block sent by a common node according to an embodiment of the present invention, and as shown in fig. 6, when target data is a target block, a first gateway node receives the target block broadcasted by the target common node, and then performs the following steps:
firstly, the target block is saved in a local database, the target block is added into a local cache, and the priority value of the target block in the local cache is set as a second preset value GBN.
And judging whether the missing block exists according to the numbers of other blocks stored in the local database and the number of the target block.
If there is a missing block, a block request is sent to the second gateway node to obtain the missing block.
And a plurality of gateway nodes send the transaction information and the block information in the local cache to the ground master station of the satellite according to a fixed period. And the gateway node selects the transaction and the block from the local cache to send according to the sequence of the priority values from large to small. If the priority values are the same, the transaction and the block forwarding priority strategy in the blockchain system are sent.
For example, in the example in the above embodiment, after receiving the block a broadcast by the regular node a1, the gateway node B1 stores the block a in the local database, adds the block a to the local cache, and sets the value of the priority of the block a in the local cache to the second preset value GBN, where GBN is 255.
If the block a has a number of 8 and the other blocks stored in the local database of the gateway node B1 have numbers of: "1, 2, 3, 4, 5, 6", since the numbers of the blocks are arranged in a certain order, after receiving the block a, the gateway node B1 can determine that there is a block with a number of 7 according to the numbers of other blocks and the number of the block a stored in the local database.
At this point, the gateway node B1 sends a chunk request to gateway node B2 to obtain the missing chunk numbered 7.
The communication broadcast self-adaptive fusion method in the satellite-ground cooperative block chain system provided by the embodiment of the invention can carry out cooperative scheduling self-adaptive retransmission broadcast through the ground node and the satellite, and can effectively utilize the high efficiency of the satellite large-range broadcast and the flexibility of ground network transmission, thereby meeting the requirements of the block chain system on high speed, reliability and whole network synchronization of the communication system.
On the basis of the above embodiments, further, when the target data is a target transaction, after the first gateway node receives the target transaction broadcasted by the satellite, the following steps are executed:
checking whether the target transaction exists in a local cache;
if the target transaction does not exist, storing the target transaction in a local database;
and if the target transaction exists, deleting the target transaction from a local cache.
Specifically, fig. 7 is a schematic diagram of a transmission logic flow after a gateway node receives a transaction of a satellite broadcast according to an embodiment of the present invention, and as shown in fig. 7, when target data is a target transaction, a first gateway node receives the target transaction of the satellite broadcast, and then performs the following steps:
first, the target transaction is validated for legitimacy.
If the verification is passed, it is checked whether the target transaction is in the local cache.
If the target transaction does not exist, the target transaction is saved in a local database.
And if the target transaction exists, deleting the target transaction from the local cache.
For example, in the example of the above embodiment, after receiving transaction a broadcast by the satellite, gateway node B1 verifies the validity of transaction a. If the verification passes, it is checked whether transaction A is in the local cache.
If transaction A does not exist, transaction A is saved in a local database. If transaction A exists, transaction A also exists in the local database, and at the moment, transaction A is deleted from the local cache.
The communication broadcast self-adaptive fusion method in the satellite-ground cooperative block chain system provided by the embodiment of the invention can carry out cooperative scheduling self-adaptive retransmission broadcast through the ground node and the satellite, and can effectively utilize the high efficiency of the satellite large-range broadcast and the flexibility of ground network transmission, thereby meeting the requirements of the block chain system on high speed, reliability and whole network synchronization of the communication system.
On the basis of the foregoing embodiments, further, when the target data is a target block, after the first gateway node receives the target block broadcasted by the satellite, the following steps are performed:
checking whether the target block exists in a local cache or not;
if the target block does not exist, storing the target block into a local database, and judging whether a missing block exists according to the numbers of other stored blocks in the local database and the number of the target block;
if there is a missing block, a block request is sent to the second gateway node to obtain the missing block.
Specifically, fig. 8 is a schematic diagram of a transmission logic flow after the gateway node receives a block of the satellite broadcast according to an embodiment of the present invention, and as shown in fig. 8, when the target data is a target block, the first gateway node performs the following steps after receiving the target block of the satellite broadcast:
first, the target block is validated.
If the verification is passed, whether the target block exists in the local cache is checked.
If the target block does not exist, the target block is stored in a local database, and whether a missing block exists is judged according to the numbers of other stored blocks in the local database and the number of the target block. If there is a missing block, a block request is sent to the second gateway node to obtain the missing block.
If the target block exists, the target block is deleted from the local cache.
For example, in the example of the above embodiment, after receiving the block a broadcast by the satellite, the gateway node B1 verifies the validity of the block a, and if the verification is passed, checks whether the block a exists in the local cache.
If there is no block a, then block a is saved in the local database, and if block a is numbered 8, then the numbers of the other blocks saved in the local database of gateway node B1 are: "1, 2, 3, 4, 5, 6", since the numbers of the blocks are arranged in a certain order, after receiving the block a, the gateway node B1 can determine that there is a block with a number of 7 according to the numbers of other blocks and the number of the block a stored in the local database. At this point, gateway node B1 sends a chunk request to gateway node B2 to obtain the missing chunk numbered 7.
If the block A exists in the local cache, the block A is deleted from the local cache.
The communication broadcast self-adaptive fusion method in the satellite-ground cooperative block chain system provided by the embodiment of the invention can carry out cooperative scheduling self-adaptive retransmission broadcast through the ground node and the satellite, and can effectively utilize the high efficiency of the satellite large-range broadcast and the flexibility of ground network transmission, thereby meeting the requirements of the block chain system on high speed, reliability and whole network synchronization of the communication system.
On the basis of the foregoing embodiments, further, after the second gateway node receives the blocking request, the following steps are performed:
checking whether the target block exists in a local database;
if the target block exists, the target block is sent to a requester;
checking whether the target block exists in a local cache or not;
and if the target block exists, increasing the priority value of the target block in the local cache by one unit.
Specifically, fig. 9 is a schematic diagram of a logic flow of transmission after a gateway node receives a blocking request according to an embodiment of the present invention, and as shown in fig. 9, after the second gateway node receives the blocking request for a target block, the following steps are performed:
first, whether the target block exists in the local database is checked.
If the target block exists in the local database, the target block is sent to a requester, and then whether the target block exists in a local cache or not is checked; if the target block exists in the local cache, the priority value of the target block in the local cache is increased by one unit, and if the priority value is already the maximum value, the maximum value is kept.
If the target block does not exist in the local cache, adding the target block into the local cache, and setting the priority value of the target block in the local cache as GB.
If the target block does not exist in the local database, returning a search failure instruction to the requester for indicating that the target block cannot be searched, and sending a block request aiming at the target block to other gateway nodes.
For example, in the example of the above embodiment, after receiving the tile request for tile a sent by the neighboring node a2 or the gateway node B1, the gateway node B2 checks whether there is tile a in the local database.
If the local database has the block A, the block A is sent to a neighbor node A2 or a gateway node B1, and then whether the block A exists in a local cache or not is checked; if the local cache has the block A, the priority value of the block A in the local cache is increased by one, and if the priority value is already the maximum value 255, the maximum value 255 is kept.
If the local cache does not have the block A, adding the block A into the local cache, and setting the priority value of the block A in the local cache as GB, wherein GB is 0.
If there is no tile A in the local database, a search failure instruction is returned to the neighboring node A2 or the gateway node B1 indicating that the target tile is not found, and a tile request for the target tile is sent to another gateway node, such as the gateway node B3.
The communication broadcast self-adaptive fusion method in the satellite-ground cooperative block chain system provided by the embodiment of the invention can carry out cooperative scheduling self-adaptive retransmission broadcast through the ground node and the satellite, and can effectively utilize the high efficiency of the satellite large-range broadcast and the flexibility of ground network transmission, thereby meeting the requirements of the block chain system on high speed, reliability and whole network synchronization of the communication system.
On the basis of the above embodiments, further, when the target data is a target transaction, after receiving the target transaction sent by the first gateway node, the satellite performs the following steps:
checking whether the target transaction exists in a local cache;
if the target transaction does not exist, adding the target transaction into a local cache, and setting the priority value of the target transaction in the local cache as a third preset value ST;
and if the target transaction exists, increasing the priority value of the target transaction in a local cache by one unit.
Specifically, fig. 10 is a schematic diagram of a transmission logic flow after a satellite receives a transaction sent by a gateway node according to an embodiment of the present invention, and as shown in fig. 10, when target data is a target transaction, the satellite receives the target transaction sent by a first gateway node through a ground master station, and then performs the following steps:
firstly, the target transaction is validated legally, and if the validation is passed, whether the target transaction exists in the local cache is checked.
If the target transaction does not exist, the target transaction is added into the local cache, and the value of the priority of the target transaction in the local cache is set as a third preset value ST.
If the target transaction exists, the priority value of the target transaction in the local cache is increased by one unit, and if the priority value is already the maximum value, the maximum value is kept.
For example, in the example of the above embodiment, after the satellite receives transaction a sent by gateway node B1 via the ground master station, it checks whether transaction a is in the local cache.
If the transaction A does not exist in the local cache, adding the transaction A into the local cache, and setting the priority value of the transaction A in the local cache as ST, wherein the ST is 0.
If transaction a is in the local cache, the value of the priority of transaction a in the local cache is increased by one, and if the value of the priority is already the maximum value 255, the maximum value 255 is maintained.
The communication broadcast self-adaptive fusion method in the satellite-ground cooperative block chain system provided by the embodiment of the invention can carry out cooperative scheduling self-adaptive retransmission broadcast through the ground node and the satellite, and can effectively utilize the high efficiency of the satellite large-range broadcast and the flexibility of ground network transmission, thereby meeting the requirements of the block chain system on high speed, reliability and whole network synchronization of the communication system.
On the basis of the foregoing embodiments, further, when the target data is a target block, after the satellite receives the target block sent by the first gateway node, the following steps are performed:
checking whether the target block exists in a local cache or not;
if the target block does not exist, adding the target block into a local cache, and setting the priority value of the target block in the local cache as a fourth preset value SB;
and if the target block exists, increasing the priority value of the target block in the local cache by one unit.
Specifically, fig. 11 is a schematic diagram of a transmission logic flow after a satellite receives a block sent by a gateway node according to an embodiment of the present invention, and as shown in fig. 11, when target data is a target block, the satellite receives the target block sent by a first gateway node through a ground master station, and then performs the following steps:
firstly, the target block is validated, if the validation is passed, the local cache is checked whether the target block exists.
If the target block does not exist, adding the target block into the local cache, and setting the priority value of the target block in the local cache as a fourth preset value SB.
If the target block exists, the priority value of the target block in the local cache is increased by one unit, and if the priority value is already the maximum value, the maximum value is kept.
For example, in the example of the above embodiment, after the satellite receives the block a sent by the gateway node B1 through the ground master station, it checks whether there is the block a in the local cache.
If the local cache does not have the block A, adding the block A into the local cache, and setting the priority value of the block A in the local cache to be SB, wherein the SB is 8.
If the local cache has the block A, the priority value of the block A in the local cache is increased by one, and if the priority value is already the maximum value 255, the maximum value 255 is kept.
The communication broadcast self-adaptive fusion method in the satellite-ground cooperative block chain system provided by the embodiment of the invention can carry out cooperative scheduling self-adaptive retransmission broadcast through the ground node and the satellite, and can effectively utilize the high efficiency of the satellite large-range broadcast and the flexibility of ground network transmission, thereby meeting the requirements of the block chain system on high speed, reliability and whole network synchronization of the communication system.
The method comprises the steps that a satellite main station receives transactions and blocks of a plurality of gateway nodes and then sends the transactions and the blocks to a satellite main body, the satellite main body broadcasts transaction and block information to all the nodes at fixed time slot intervals, the satellite main body selects the transactions and the blocks from a local cache region of a ground main station according to the sequence of descending priority values to send, and if the priorities of the transactions and the blocks are the same, the transactions and the block broadcasting priority strategies are sequenced according to a block chain system. And after the ground master station of the satellite finishes transmitting the data, deleting the data from the local cache region.
The transaction data and the block data to be broadcast by the satellite main body are respectively encoded by fountain codes and then broadcast.
In the embodiment of the invention, the values GB, GTN, GBN, ST and SB of the priority can be configured according to the actual system requirement, and can also be dynamically adjusted according to the system operation condition.
Finally, the effect of the embodiment of the present invention is further described in detail by another example:
in a satellite blockchain system with 2 gateway nodes and N common nodes, it is assumed that the average transmission delay between the common nodes, between the common nodes and the gateway nodes is 100ms, and the transmission time between the gateway nodes and the satellite is 200 ms. According to the data given in the prior art, the average time from the generation of a data packet by a common node to the realization of the whole network diffusion is 13s by adopting the traditional point-to-point broadcasting scheme. The transmission time required by the scheme in the embodiment of the present invention is 100+100+200+200 — 600ms, and the total transmission time in the embodiment of the present invention is only 4.6% of that in the conventional scheme.
When the satellite is adopted, due to the fact that a retransmission mechanism with cooperation of the ground and the satellite is adopted, reliable transmission of transaction and block information is guaranteed, effective broadcasting of data is guaranteed through retransmission when part of nodes cannot receive the broadcasting data, and efficiency and reliability are both considered. Assuming that D is the number of transactions in each tile and T is the time required to broadcast a tile, the throughput of the blockchain system can be measured in terms of D/T. According to the test results in the prior art, for the conventional blockchain system, when D <20k, increasing D can improve the system throughput. However, when D is large enough, the system throughput tends to be saturated, which seriously affects the practicality of the blockchain system. In the block transmission scheme of the invention, T can be kept unchanged within a certain range only by correspondingly improving communication resources such as time frequency, power and the like of transmission after D is increased, so that the throughput of a block chain system can be greatly improved by improving the transaction amount of each broadcast.
Assuming that the probability of packet loss or error of the satellite broadcast is p, the packet size is B bits. If the strategy of satellite terrestrial cooperative retransmission is not adopted, all terrestrial retransmission is assumed, and the data transmission quantity brought by each data packet is pBN. When the number N of users is large, the amount of retransmission data is large, which easily causes the blocking of the gateway node. If all are retransmitted by the satellite, the satellite needs to retransmit the data with a probability p, reducing the satellite broadcast efficiency. After the scheme of the invention is adopted, the broadcasting is carried out through the satellite only when a large number of nodes do not correctly receive the satellite broadcasting, and the retransmission parameters can be dynamically adjusted according to the bandwidth, the data transmission quantity and the actual transmission channel characteristics of the actual satellite, so that the ground communication retransmission or the satellite broadcasting retransmission is dynamically selected, the integral efficiency of the ground communication and the satellite broadcasting is improved, and the high-speed and reliable data synchronization of the whole network is realized.
Fig. 12 is a schematic diagram of a communication broadcast adaptive fusion device in a satellite-ground coordination blockchain system according to an embodiment of the present invention, and as shown in fig. 12, an embodiment of the present invention provides a communication broadcast adaptive fusion device in a satellite-ground coordination blockchain system, which is used for executing the method described in any of the embodiments above, and specifically includes a broadcast module 1201 and a determination module 1202, where:
the target common node is used for broadcasting target data generated by the target common node through a broadcasting module 1201, and starts timing to enable a first neighbor node to continue broadcasting the target data, so that a first gateway node sends the target data to a satellite, and the satellite broadcasts the target data in the whole network; after a preset time, if the target common node determines that the target data broadcasted by the satellite is not received through the determination module 1202, the target common node retransmits the target data to the first gateway node, so that the first gateway node retransmits the target data to the satellite, and the satellite performs the whole network broadcasting on the target data again.
An embodiment of the present invention provides a communication broadcast adaptive fusion apparatus in a satellite-ground collaborative blockchain system, configured to execute the method described in any of the above embodiments, where specific steps of executing the method described in one of the above embodiments by the apparatus provided in this embodiment are the same as those in the corresponding embodiment described above, and are not described here again.
The communication broadcast self-adaptive fusion device in the satellite-ground cooperative block chain system provided by the embodiment of the invention can carry out cooperative scheduling self-adaptive retransmission broadcast through the ground node and the satellite, and can effectively utilize the high efficiency of the satellite large-range broadcast and the flexibility of ground network transmission, thereby meeting the requirements of the block chain system on high speed, reliability and whole network synchronization of the communication system.
Fig. 13 is a schematic structural diagram of an electronic device according to an embodiment of the present invention, and as shown in fig. 13, the electronic device includes: processor 1301, memory 1302, and bus 1303;
the processor 1301 and the memory 1302 complete communication with each other through the bus 1303;
the method comprises the steps that a target common node broadcasts target data generated by the target common node, timing is started, so that a first neighbor node continuously broadcasts the target data, a first gateway node sends the target data to a satellite, and the satellite broadcasts the target data in a whole network;
after a preset time, if the target common node does not receive the target data broadcasted by the satellite, the target data is sent to the first gateway node again, so that the first gateway node sends the target data to the satellite again, and the satellite broadcasts the target data in the whole network again.
Embodiments of the present invention provide a computer program product comprising a computer program stored on a non-transitory computer-readable storage medium, the computer program comprising program instructions that, when executed by a computer, enable the computer to perform the methods provided by the above-mentioned method embodiments, for example, including:
the method comprises the steps that a target common node broadcasts target data generated by the target common node, timing is started, so that a first neighbor node continuously broadcasts the target data, a first gateway node sends the target data to a satellite, and the satellite broadcasts the target data in a whole network;
after a preset time, if the target common node does not receive the target data broadcasted by the satellite, the target data is sent to the first gateway node again, so that the first gateway node sends the target data to the satellite again, and the satellite broadcasts the target data in the whole network again.
Embodiments of the present invention provide a non-transitory computer-readable storage medium, which stores computer instructions, where the computer instructions cause the computer to perform the methods provided by the above method embodiments, for example, the methods include:
the method comprises the steps that a target common node broadcasts target data generated by the target common node, timing is started, so that a first neighbor node continuously broadcasts the target data, a first gateway node sends the target data to a satellite, and the satellite broadcasts the target data in a whole network;
after a preset time, if the target common node does not receive the target data broadcasted by the satellite, the target data is sent to the first gateway node again, so that the first gateway node sends the target data to the satellite again, and the satellite broadcasts the target data in the whole network again.
Those of ordinary skill in the art will understand that: all or part of the steps for implementing the method embodiments may be implemented by hardware related to program instructions, and the program may be stored in a computer readable storage medium, and when executed, the program performs the steps including the method embodiments; and the aforementioned storage medium includes: various media that can store program codes, such as ROM, RAM, magnetic or optical disks.
The above-described embodiments of the apparatuses and devices are merely illustrative, where the units described as separate parts may or may not be physically separate, and the parts displayed as units may or may not be physical units, may be located in one place, or may be distributed on multiple network units. Some or all of the modules may be selected according to actual needs to achieve the purpose of the solution of the present embodiment. One of ordinary skill in the art can understand and implement it without inventive effort.
Through the above description of the embodiments, those skilled in the art will clearly understand that each embodiment can be implemented by software plus a necessary general hardware platform, and certainly can also be implemented by hardware. With this understanding in mind, the above-described technical solutions may be embodied in the form of a software product, which can be stored in a computer-readable storage medium such as ROM/RAM, magnetic disk, optical disk, etc., and includes instructions for causing a computer device (which may be a personal computer, a server, or a network device, etc.) to execute the methods described in the embodiments or some parts of the embodiments.
Finally, it should be noted that: the above examples are only intended to illustrate the technical solution of the present invention, but not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions of the embodiments of the present invention.
Claims (9)
1. A communication broadcast adaptive fusion method in a satellite-ground cooperative block chain system is characterized by comprising the following steps:
the method comprises the steps that a target common node broadcasts target data generated by the target common node, timing is started, so that a first neighbor node continuously broadcasts the target data, a first gateway node sends the target data to a satellite, and the satellite broadcasts the target data in a whole network;
after a preset time, if the target common node does not receive the target data broadcasted by the satellite, the target data is sent to the first gateway node again, so that the first gateway node sends the target data to the satellite again, and the satellite broadcasts the target data in the whole network again;
when the target data is a target transaction, after the satellite receives the target transaction sent by the first gateway node, the following steps are executed:
checking whether the target transaction exists in a local cache;
if the target transaction does not exist, adding the target transaction into a local cache, and setting the priority value of the target transaction in the local cache as a third preset value;
and if the target transaction exists, increasing the priority value of the target transaction in a local cache by one unit.
2. The method according to claim 1, wherein when the target data is a target transaction, after the first neighboring node receives the target transaction broadcast by the target ordinary node, the following steps are performed:
verifying the validity of the target transaction;
and if the verification is passed, adding the target transaction into a local transaction pool, otherwise, discarding the target transaction.
3. The method according to claim 1, wherein when the target data is a target block, after the first neighboring node receives the target block broadcast by the target regular node, the following steps are performed:
verifying the legality of the target block;
if the verification is passed, judging whether a missing block exists according to the numbers of other blocks stored in the local database and the number of the target block;
and if the missing blocks exist, sending a block request to a second neighbor node and a second gateway node to acquire the missing blocks.
4. The method according to claim 1, wherein when the target data is a target transaction, after the first gateway node receives the target transaction broadcast by the target ordinary node, the following steps are performed:
checking whether the target transaction exists in a local cache;
if the target transaction does not exist, the target transaction is stored in a local database, the target transaction is added into a local cache, and the priority value of the target transaction in the local cache is set as a first preset value.
5. The method according to claim 1, wherein when the target data is a target block, after the first gateway node receives the target block broadcast by the target regular node, the following steps are performed:
storing the target block into a local database, adding the target block into a local cache, and setting the priority value of the target block in the local cache as a second preset value;
judging whether a missing block exists according to the numbers of other stored blocks in a local database and the number of the target block;
if there is a missing block, a block request is sent to the second gateway node to obtain the missing block.
6. The method according to claim 1, wherein when the target data is a target transaction, the first gateway node performs the following steps after receiving the target transaction broadcasted by the satellite:
checking whether the target transaction exists in a local cache;
if the target transaction does not exist, storing the target transaction in a local database;
and if the target transaction exists, deleting the target transaction from a local cache.
7. The method of claim 1, wherein when the target data is a target block, the first gateway node performs the following steps after receiving the target block broadcasted by the satellite:
checking whether the target block exists in a local cache or not;
if the target block does not exist, storing the target block into a local database, and judging whether a missing block exists according to the numbers of other stored blocks in the local database and the number of the target block;
if there is a missing block, a block request is sent to the second gateway node to obtain the missing block.
8. The method according to any of claims 3, 5 or 7, wherein after receiving the blocking request, the second gateway node performs the following steps:
checking whether the target block exists in a local database;
if the target block exists, the target block is sent to a requester;
checking whether the target block exists in a local cache or not;
and if the target block exists, increasing the priority value of the target block in the local cache by one unit.
9. The method of claim 1, wherein when the target data is a target block, after the satellite receives the target block sent by the first gateway node, the following steps are performed:
checking whether the target block exists in a local cache or not;
if the target block does not exist, adding the target block into a local cache, and setting the priority value of the target block in the local cache as a fourth preset value;
and if the target block exists, increasing the priority value of the target block in the local cache by one unit.
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| CN110099127A (en) * | 2019-05-13 | 2019-08-06 | 西安华域网络文化发展有限公司 | A kind of block chain method of data synchronization, device, medium and electronic equipment |
| CN111200500B (en) * | 2019-12-19 | 2022-07-01 | 广西大学 | Satellite management method based on block chain and physical unclonable function |
| CN111147392B (en) * | 2019-12-25 | 2021-08-24 | 腾讯科技（深圳）有限公司 | Data synchronization method, device and equipment based on block chain and readable storage medium |
| CN112202487B (en) * | 2020-09-30 | 2022-03-08 | 东南大学 | Block chain structure based on satellite |
| CN112671452B (en) * | 2020-12-17 | 2023-03-14 | 西安电子科技大学 | Heterogeneous satellite network management method, system, medium, equipment, terminal and application |
| CN113905059B (en) * | 2021-06-03 | 2022-07-01 | 电子科技大学 | Block storage method and model of lightweight block chain of Internet of vehicles |
| CN114071247B (en) * | 2021-11-02 | 2024-03-01 | 上海佰贝网络工程技术有限公司 | Block chain data broadcast transmission method, system, computer equipment and computer readable storage medium |
| CN117031511B (en) * | 2023-10-09 | 2024-02-20 | 北京星河动力装备科技有限公司 | Spacecraft navigation method, device, system, electronic equipment and storage medium |
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