CN113114340B - Simultaneous same-frequency full-duplex measurement and control communication networking method - Google Patents
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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
- H04B7/18521—Systems of inter linked satellites, i.e. inter satellite service
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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
- H04B7/1851—Systems using a satellite or space-based relay
- H04B7/18519—Operations control, administration or maintenance
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L5/00—Arrangements affording multiple use of the transmission path
- H04L5/14—Two-way operation using the same type of signal, i.e. duplex
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02D—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN INFORMATION AND COMMUNICATION TECHNOLOGIES [ICT], I.E. INFORMATION AND COMMUNICATION TECHNOLOGIES AIMING AT THE REDUCTION OF THEIR OWN ENERGY USE
- Y02D30/00—Reducing energy consumption in communication networks
- Y02D30/70—Reducing energy consumption in communication networks in wireless communication networks
Abstract
The method for networking the simultaneous co-frequency full-duplex measurement and control communication can improve the channel use efficiency, the networking access timeliness and the anti-interference capability. The invention is realized by the following technical scheme: the satellite node networking adopts a clustering structure, cluster heads broadcast cluster information through a downlink common spread spectrum channel, all satellites in the clusters share an uplink common spread spectrum channel to bear network control information sent to the cluster heads, and the satellites compete to access the uplink common spread spectrum channel through a full-duplex carrier sense and collision avoidance mode; each satellite applies a special spread spectrum channel for bearing measurement and control communication service to the cluster head, and service transmission between the satellites adopts a simultaneous same-frequency full duplex mode. The node X broadcasts through (1) cluster head information; (2) a network access request; (3) returning to the network; (4) discovering a neighbor node; (5) neighbor node handshaking; (6) confirming network access; (7) and the network access process is completed by the whole network information updating step.
Description
Technical Field
The invention belongs to the field of wireless communication, and particularly relates to a measurement and control node networking method of a measurement and control communication system in the field of aerospace measurement and control communication.
Technical Field
The common-frequency simultaneous full-duplex CCFD is a novel duplex technology which is emerging in recent years. The technology can realize signal transmission on the same physical channel, namely, the transmission and the reception of signals are realized at the same time and the same frequency. Compared with the traditional Time Division Duplex (TDD) and Frequency Division Duplex (FDD) modes, the CCFD technique realizes communication links in two directions on the same channel, thereby improving the spectrum efficiency by nearly one time. After a full-duplex technology is introduced into a wireless communication network, interference between receiving and transmitting is an important factor influencing system performance, all simultaneous same-frequency transmitting nodes are interference sources for non-target receiving nodes, and meanwhile, a transmitting signal of a same-frequency transmitter can generate strong self-interference for a local receiver, so that one of the application keys of the simultaneous same-frequency full-duplex system is effective interference elimination. At present, a great deal of achievements are researched aiming at the interference elimination technology, various interference elimination methods such as space domain interference suppression, radio frequency domain interference suppression, digital domain interference suppression and the like are provided, the problem of basic application of the simultaneous same-frequency full duplex technology is basically solved, and a foundation is laid for network application of the simultaneous same-frequency full duplex technology.
With the development of space industry, the increase of the number of satellite users in the field of space measurement and control, the increasing of space and aviation launching tasks and the large number of reconnaissance, surveying and mapping, meteorological, communication, navigation and remote sensing tasks of on-orbit satellites lead to the explosive increase of the space measurement and control task quantity and the increasingly sharp contradiction between communication service quantity and spectrum resources. Because the measurement and control network scale is continuously increased, the number and tasks of measurement and control satellites are increased sharply, and the traditional satellite measurement and control mode of measurement and control by using a foundation or a space-based measurement and control station has the problems of high power consumption, transmission delay, ground coverage, reliability, quick iteration and the like. One solution is: the large-scale satellite nodes are connected through the self-organizing network, so that the interaction, aggregation and distribution of the node measurement and control information in the network are realized, and the measurement and control of the large-scale satellite can be completed only by supporting a small number of links of the satellite nodes and the measurement and control station. However, in the existing satellite network, the satellite nodes generally adopt a duplex mode of frequency division duplex or time division duplex, and realize large-scale satellite node networking by combining a time division multiple access technology, so that the problems of complex frequency pairing, limited channel capacity and the like exist.
In the scene application of a satellite measurement and control network, how to utilize a simultaneous same-frequency full duplex technology to construct a network which can reduce time-frequency resource occupation, improve system capacity, improve channel use efficiency and networking access timeliness becomes a research direction with prospect.
Disclosure of Invention
In order to solve the problems of rapid, reliable and efficient networking of a satellite measurement and control communication network, the invention aims to provide a same-frequency full-duplex measurement and control communication networking method which can reduce time-frequency resource occupation, improve system capacity, and improve channel use efficiency and networking access timeliness.
The above object of the present invention can be achieved by the following measures, and a method for simultaneous co-frequency full duplex measurement and control communication networking is characterized by comprising the following steps: the service transmission between the satellites adopts a simultaneous same-frequency full duplex mode, and the satellites compete to access an uplink public spread spectrum channel in a full duplex carrier sense and conflict avoidance mode; in the satellite node networking, a cluster structure that each cluster is uniformly managed by a cluster head is adopted, all satellites in the cluster share one uplink common spread spectrum channel to bear network control information sent to the cluster head, the cluster head periodically broadcasts cluster information through the downlink common spread spectrum channel, and each satellite applies for a special spread spectrum channel for bearing measurement and control communication services to the cluster head; after monitoring the periodically broadcast cluster information, the node X sends a network access request to the cluster head through an uplink common spread spectrum channel, applies for network access and requests network resources; after receiving a network access request sent by a node X, a cluster head sends a network access reply frame on a downlink public spread spectrum channel after a waiting time, which indicates that the handshake is completed and the connection is successfully established; a node X receives an access network reply frame sent by a cluster head, selects an unused spread spectrum code as a self special spread spectrum channel spread spectrum code according to the content carried by the access network reply frame, and broadcasts a node discovery frame to the whole network through an uplink public spread spectrum channel; after the neighbor node of the node X receives the node discovery frame sent by the node X, the node X establishes handshake connection through an uplink common control channel, confirms that the node X is the neighbor node, and then updates a neighbor table and a routing table; after waiting for a period of time for the neighbor node to reply, the node X considers that the neighbor node is found out completely, and then sends a network access confirmation frame to the cluster head through an uplink common spread spectrum channel; and after receiving the network access confirmation frame sent by the node X, the cluster head indicates that the new node successfully accesses the network, updates the network data table and the resource use information, and performs whole-network broadcasting on the spreading codes distributed to the node X.
The invention has the following beneficial effects:
the networking method has the advantages that the satellite node networking adopts a clustering structure, and each cluster is uniformly managed by a cluster head; the cluster head broadcasts cluster information through a downlink common spread spectrum channel, all satellites in the cluster share one uplink common spread spectrum channel to bear network control information sent to the cluster head, and the satellites compete to access the uplink common spread spectrum channel through a full-duplex carrier sense and conflict avoidance mode; each satellite applies a special spread spectrum channel for bearing measurement and control communication service to the cluster head, and service transmission between the satellites adopts a simultaneous same-frequency full duplex mode. The self-organizing networking mode of clustering networking, full duplex carrier sense access and special spread spectrum channel design can realize the rapid, reliable and efficient networking of the satellite measurement and control communication network. The method can lead the large-scale node networking of the system to be flexible, has no transmission bearing bottleneck, can replace the node redundancy, and has strong system survivability and high reliability compared with the traditional mode.
The invention adopts (1) cluster head information broadcast; (2) a network access request; (3) returning to the network; (4) discovering a neighbor node; (5) neighbor node handshaking; (6) confirming network access; (7) in the network access process of information updating of the whole network, full-duplex carrier sense access is utilized, each node carries out uninterrupted carrier sense in the data sending process, and data is stopped immediately when collision occurs, so that the delay of half-duplex sensing information can be avoided, the sensing time of the collision is shortened, and the use efficiency of a channel and the access timeliness of a network group are improved.
In the invention, after receiving the node discovery frame sent by the node X, the neighbor node of the node X establishes handshake connection with the node X through an uplink common control channel to confirm that the nodes are neighbor nodes, and then the neighbor nodes and the routing table are updated by the two parties. The topology condition in the node cluster can be quickly acquired by the way of handshaking between the broadcast and the neighbor nodes during network access.
The invention adopts the cluster head to successfully access the network after receiving the network access confirmation frame sent by the node X, the cluster head updates the network data table and the resource use information, and the whole network broadcasting is carried out on the spread spectrum code distributed to the node X. The method can accurately distinguish and identify the information source by distributing different spreading codes to different nodes, and has good anti-interference and data confidentiality.
Drawings
The invention is further described with reference to the following figures and examples.
Fig. 1 is a schematic diagram of a simultaneous same-frequency full-duplex measurement and control communication networking scene of an LEO satellite group.
Fig. 2 is a schematic diagram of a network access process of a new node of the simultaneous same-frequency full-duplex measurement and control communication networking of the invention.
Detailed Description
Refer to fig. 1 and 2. According to the invention, the service transmission between the satellites adopts a simultaneous same-frequency full duplex mode, and the satellites compete to access an uplink common spread spectrum channel in a full duplex carrier sense and conflict avoidance mode; in the satellite node networking, a cluster structure that each cluster is uniformly managed by a cluster head is adopted, all satellites in the cluster share one uplink common spread spectrum channel to bear network control information sent to the cluster head, the cluster head periodically broadcasts cluster information through the downlink common spread spectrum channel, and each satellite applies for a special spread spectrum channel for bearing measurement and control communication services to the cluster head; after monitoring the periodically broadcast cluster information, the node X sends a network access request to the cluster head through an uplink common spread spectrum channel, applies for network access and requests network resources; after receiving a network access request sent by a node X, a cluster head sends a network access reply frame on a downlink common spread spectrum channel after waiting time, which indicates that the handshake is completed and the connection is successfully established; a node X receives an access network reply frame sent by a cluster head, selects an unused spread spectrum code as a self special spread spectrum channel spread spectrum code according to the content carried by the access network reply frame, and broadcasts a node discovery frame to the whole network through an uplink public spread spectrum channel; after the neighbor node of the node X receives the node discovery frame sent by the node X, the node X establishes handshake connection through an uplink common control channel to confirm that the neighbor nodes are mutually adjacent, and then the neighbor table and the routing table are updated by the node X and the neighbor node; after waiting for a period of time for the neighbor node to reply, the node X considers that the neighbor node is found out completely, and then sends a network access confirmation frame to the cluster head through an uplink common spread spectrum channel; and after receiving the network access confirmation frame sent by the node X, the cluster head indicates that the new node successfully accesses the network, updates the network data table and the resource use information, and performs whole-network broadcasting on the spreading codes distributed to the node X.
In order to illustrate a specific implementation of the simultaneous co-frequency full-duplex measurement and control communication networking, a simultaneous co-frequency full-duplex measurement and control communication networking process is described based on an LEO satellite group. The method divides an LEO satellite group into 4 LEO satellite clusters, N satellites are arranged in one cluster, 1 satellite is selected from each cluster as a cluster head, and different clusters are mutually connected through the cluster head and a GEO/MEO satellite. Cluster heads broadcast cluster information through a downlink common spread spectrum channel, all satellites in the cluster share one uplink common spread spectrum channel to bear network control information sent to the cluster heads, and the satellites compete to access the uplink common spread spectrum channel through a full-duplex carrier sense and collision avoidance mode; each satellite applies a special spread spectrum channel for bearing measurement and control communication service to the cluster head, and service transmission between the satellites adopts a simultaneous same-frequency full duplex mode.
Participate in fig. 2. For a satellite node X attempting to access a certain cluster, the network access process comprises (1) cluster head information broadcasting; (2) a network access request; (3) returning to the network; (4) discovering a neighbor node; (5) neighbor node handshaking; (6) confirming network access; (7) and updating the information of the whole network. The steps are described in detail as follows:
step 1: the cluster head broadcasts cluster information periodically through a downlink common spread spectrum channel.
Step 2: after the node X monitors the cluster information which is periodically broadcasted, a network access request is sent to the cluster head through the uplink common spread spectrum channel, network access is applied, and network resources are requested.
And step 3: and the cluster head receives the network access request sent by the node X, and then sends a network access reply frame on the downlink common spread spectrum channel after a waiting time, which indicates that the handshake is completed and the connection is successfully established. The contents of the network access reply frame comprise available spreading codes in the cluster, address codes and spreading codes of other network nodes, topology information of nodes in the cluster and the like.
And 4, step 4: and when the node X receives the access network reply frame sent by the cluster head, selecting an unused spread spectrum code as a self special spread spectrum channel spread spectrum code according to the content carried by the access network reply frame, and broadcasting the discovery frame to the whole network broadcasting node through an uplink public spread spectrum channel. The node discovery frame contents include the node ID of node X and the selected dedicated spreading channel spreading code information.
And 5: after receiving the node discovery frame sent by the node X, the neighbor nodes of the node X establish handshake connection with the node X through an uplink common control channel to confirm that the neighbor nodes are mutually adjacent. Then both sides update the neighbor table, the routing table.
Step 6: and the node X waits for the reply of the neighbor node, and after a period of time, the node X considers that the neighbor node is found out completely. And then the node X sends a network access confirmation frame to the cluster head through an uplink public spread spectrum channel. The network access confirmation frame content comprises the node ID, the spreading code and the neighbor node information of the node X.
And 7: and after receiving the network access confirmation frame sent by the node X, the cluster head indicates that the new node successfully accesses the network, updates the network data table and the resource use information, and broadcasts the information of the node X in the whole network.
The multi-node clustering networking in the step 1 is characterized in that a huge number of network nodes are clustered and self-organized, clusters are connected through gateway node cluster heads, the data exchange of the whole network is realized, and the cluster heads at the peer positions serve as a control center at the same time.
And 2, under the access mode of full-duplex carrier sensing and collision avoidance, a sending node continuously monitors a channel and receives channel state information in the data sending process, if the channel is detected to be used by other stations, the physical layer immediately feeds back the carrier sensing result to an MAC (media access control) layer, the MAC layer controls the station to stop sending data immediately and controls the station to enter a corresponding backoff process, and delay caused by collision sensing is reduced.
And 3, each satellite has a unique spreading code according to the spreading codes in the steps 3, 4, 5 and 6. The spreading codes correspond to the node IDs one to one in the code table. When the satellite transmits data, the satellite transmits the data by using the own spreading code, thereby avoiding the interference of the data among the satellites. In addition, the common spreading channel uses a dedicated common spreading code. For each cluster, each cluster has a unique cluster address code, and the cluster address code is used as a scrambling code and is subjected to addition modulo-2 operation with a spread spectrum code, so that inter-cluster interference is avoided. For each node in the cluster, the node has a unique spreading spectrum and uses the code to spread the spreading spectrum, so as to distinguish communication information of different satellites.
The above detailed description of the embodiments of the present invention has been presented in terms of specific embodiments and is intended only to facilitate the understanding of the method and apparatus of the present invention; meanwhile, for a person skilled in the art, according to the idea of the present invention, the specific embodiments and the application range may be changed, and in summary, the content of the present specification should not be construed as a limitation to the present invention.
Claims (7)
1. A method for networking simultaneous same-frequency full-duplex measurement and control communication is characterized in that: the service transmission between the satellites adopts a simultaneous same-frequency full duplex mode, and the satellites compete to access an uplink public spread spectrum channel in a full duplex carrier sense and conflict avoidance mode; in the satellite node networking, a cluster structure that each cluster is uniformly managed by a cluster head is adopted, all satellites in the cluster share one uplink common spread spectrum channel to bear network control information sent to the cluster head, the cluster head periodically broadcasts cluster information through the downlink common spread spectrum channel, and each satellite applies for a special spread spectrum channel for bearing measurement and control communication services to the cluster head; the method comprises the following steps: after monitoring the periodically broadcast cluster information, the node X sends a network access request to the cluster head through an uplink common spread spectrum channel, applies for network access and requests network resources; after receiving a network access request sent by a node X, a cluster head sends a network access reply frame on a downlink common spread spectrum channel after waiting time, which indicates that the handshake is completed and the connection is successfully established; a node X receives an access network reply frame sent by a cluster head, selects an unused spread spectrum code as a self special spread spectrum channel spread spectrum code according to the content carried by the access network reply frame, and broadcasts a node discovery frame to the whole network through an uplink public spread spectrum channel; after the neighbor node of the node X receives the node discovery frame sent by the node X, the node X establishes handshake connection through an uplink common control channel, confirms that the node X is the neighbor node, and then updates a neighbor table and a routing table; after waiting for a period of time for the neighbor node to reply, the node X considers that the neighbor node is found out completely, and then sends a network access confirmation frame to the cluster head through an uplink common spread spectrum channel; and after receiving the network access confirmation frame sent by the node X, the cluster head indicates that the new node successfully accesses the network, updates the network data table and the resource use information, and performs whole-network broadcasting on the spreading codes distributed to the node X.
2. The simultaneous co-frequency full-duplex measurement and control communication networking method of claim 1, characterized in that: the satellite is divided into a plurality of satellite clusters, N satellites are arranged in each cluster, 1 satellite is selected from each cluster as a cluster head, and different clusters are mutually connected through the cluster heads and GEO/MEO satellites.
3. The simultaneous co-frequency full-duplex measurement and control communication networking method of claim 1, characterized in that: the contents of the network-entry reply frame comprise available spreading codes in the cluster, address codes and spreading codes of other nodes in the network, and topology information of the nodes in the cluster, and the contents of the node discovery frame comprise node ID of the node X and information of the selected spreading codes of the special spreading channels.
4. The simultaneous co-frequency full-duplex measurement and control communication networking method of claim 1, characterized in that: the satellite node networking is characterized in that a large number of satellite nodes are clustered and self-organized, clusters are connected through gateway node cluster heads, whole network data exchange is achieved, and the cluster heads in the peer-to-peer positions serve as control centers at the same time.
5. The simultaneous co-frequency full-duplex measurement and control communication networking method of claim 1, characterized in that: under the access mode of full-duplex carrier sensing and collision avoidance, a sending node continuously monitors a channel and receives channel state information in the data sending process, if the channel is detected to be used by other stations, a physical layer immediately feeds back the carrier sensing result to an MAC (media access control) layer, the MAC layer immediately stops the station from sending data and controls the station to enter a corresponding backoff process, and delay caused by collision sensing is reduced.
6. The simultaneous co-frequency full-duplex measurement and control communication networking method of claim 1, characterized in that: each satellite has a unique spreading code, the spreading codes correspond to the node IDs one by one in a code table, the satellite uses the own spreading code to transmit when the satellite transmits data, and in addition, a public spreading channel uses a special public spreading code.
7. The simultaneous co-frequency full-duplex measurement and control communication networking method of claim 1, characterized in that: for each cluster, each cluster has a unique cluster address code, and the cluster address code is used as a scrambling code and is subjected to addition modulo 2 operation with a spread spectrum code; for each node in the cluster, the node has a unique spreading code, and the spreading code is used for spreading, so that the communication information of different satellites can be distinguished.
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| CN114268360B (en) * | 2021-12-10 | 2023-07-14 | 中国运载火箭技术研究院 | Aircraft ad hoc network method based on simultaneous same-frequency full duplex |
| JP2023139533A (en) * | 2022-03-22 | 2023-10-04 | 株式会社Ｎｔｔドコモ | Communication device, base station, terminal, and communication method |
| CN114978289B (en) * | 2022-05-24 | 2023-09-26 | 中国人民解放军国防科技大学 | High-speed data transmission system of simultaneous same-frequency full duplex satellite |
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