Hybrid access control method and unmanned flexible ad hoc network system based on multi-channel access structure

Abstract

The invention provides a hybrid access control method and an unmanned flexible ad hoc network system based on a multi-channel access structure. The method comprises the following steps: in an initialization stage, configuring a plurality of service queues and cache spaces thereof; performing synchronous network access processing on each subnetwork accessed to the network; taking a time period and a time slot as units, and performing multi-service queue scheduling by combining a whole-network broadcast time period, a multi-user polling time period and a multi-user competition time period; according to the system, the method is implemented in the layered and clustered elastic ad hoc network through an established multi-channel access structure. According to the invention, a layered and clustered networking architecture and a multi-channel access structure are adopted to realize each cluster frequency packet networking and flexible networking control, and a hybrid access control method is adopted to realize service classification scheduling, so that the problems of limited network scale and capacity bottleneck in the existing ad hoc network are solved, and the service performance of the ad hoc network is improved. And the requirements of large-scale networking, flexible clustering and partition service exchange of unmanned trunking communication are met.

Description

Technical Field

[0001] The present invention relates to the technical field of data link communication, and particularly relates to a hybrid access control method and a manned and unmanned elastic ad hoc network system based on a multi-channel access structure. Background Art

[0002] Under the application background of cross-domain joint operations on land, sea and air, manned-unmanned collaborative networking requires scalable hierarchical and clustered ad hoc network technologies to achieve dynamic topology control, radio resource management and network capacity improvement of large-scale ad hoc networks. The characteristics of high-speed movement, limited energy, dynamic inter-platform links and task orientation of unmanned platforms have brought new challenges to the channel access mechanism of large-scale unmanned cluster ad hoc networks.

[0003] Channel bandwidth is a precious resource for wireless communication. When multiple users share a wireless channel, if multiple users attempt to access the channel simultaneously, data frame collisions will occur and affect reception, resulting in multiple access collisions. Therefore, a wireless communication network requires a reasonable access control (Medium Access Control, MAC) mechanism to allocate wireless channel resources to network users in ways such as time division, frequency division, and code division, so that each user can access the channel in an orderly manner in a coordinated and effective way to achieve efficient resource sharing. The design of the MAC protocol requires factors such as throughput, fairness, and quality of service.

[0004] According to the different ways for nodes to obtain channels, MAC protocols can be divided into three categories: fixed allocation MAC protocols, reservation MAC protocols, and random access MAC protocols. Fixed allocation protocols adopt static allocation strategies to fixedly allocate dedicated channel resources for network nodes. During the entire communication process, nodes exclusively use the allocated frequency, time, codeword, or spatial resources, so that network nodes can use the channel without conflict. Fixed allocation MAC protocols include: Time Division Multiple Access (TDMA), Frequency Division Multiple Access (FDMA), Code Division Multiple Access (CDMA), Space Division Multiple Access (SDMA), etc.

[0005] Reservation MAC protocols belong to dynamic allocation MAC protocols and can flexibly allocate channel resources for network nodes according to the service requirements of nodes and network topology changes. The typical method of reservation MAC protocols is to use short reservation packets to reserve channels in advance. Once the reservation is successful, subsequent packets will be sent without conflict. Representatives of reservation MAC protocols include Packet Reservation Multiple Access (PRMA), Hop Reservation Multiple Access (HRMA), Collision Avoidance Time Division Multiple Access (CATA), etc.

[0006] The random competition MAC protocol uses a random access strategy. Each node obtains the right to use the channel in a competitive manner. When a node has data to transmit, it immediately or after listening to the idle channel, it randomly accesses the channel with a certain transmission probability. If a collision occurs, the algorithm backs off or directly modifies the probability for the next retransmission. Using the random competition MAC access mechanism, the network nodes are functionally equivalent, which is suitable for distributed networking application environments. Typical random competition access mechanisms include: ALOHA protocol, carrier sense MA (CSMA), collision avoidance multiple access protocol (MACA), etc.

[0007] Traditional multiple access protocols assume that the channel can only carry a single signal transmission at the same time, and the system throughput cannot exceed the maximum link rate. In particular, the throughput of the random contention channel is limited by the probability of contention conflict. When the number of competing users increases, the probability of transmission failure will also increase exponentially, and the system throughput will be seriously deteriorated.

[0008] Traditional channel multiplexing technology uses time division, frequency division, code division or statistical multiplexing to allocate or schedule channel resources. The peak throughput of a single channel is less than the link transmission rate, and there is a bottleneck in improving channel capacity.

[0009] The existing wireless ad hoc network uses a single channel to carry network control signaling and multi-service transmission, which has limited network scale and capacity bottleneck effect, and cannot meet the needs of large-scale networking, flexible clustering and partitioned service exchange for unmanned cluster communications. Summary of the invention

[0010] The object of the present invention is to solve at least one of the above-mentioned technical drawbacks.

[0011] To this end, one purpose of the present invention is to propose a hybrid access control method and an unmanned flexible self-organizing network system based on a multi-channel access structure, which adopts a layered cluster networking architecture and a multi-channel access structure to realize frequency grouping networking and flexible networking control of each cluster, and adopts a hybrid access control method to realize service classification scheduling.

[0012] In order to achieve the above object, an embodiment of one aspect of the present invention provides a hybrid access control method, which performs service scheduling according to a set 4-level identifier, wherein the 4-level identifier includes a subnet address, a user address, a service type, and a QOS priority, and specifically includes the following steps:

[0013] S1. In the initialization phase, multiple service queues and their cache spaces are configured;

[0014] S2, synchronize the access to each subnet;

[0015] S3, using time periods and time slots as units, adopting a combination of network-wide broadcast periods, multi-user polling periods, and multi-user competition periods to perform multi-service queue scheduling;

[0016] During the full - network broadcast period, when there are data packets in the full - network broadcast service queue, the full - network time - slot allocation table is used for full - network broadcast service scheduling;

[0017] During the multi - user polling period, the sub - network time - slot allocation table is used to perform periodic service queue scheduling for the time - sharing telemetry service queue or other periodic service queues;

[0018] During the multi - user competition period, competition access is carried out, specifically including: preemptive competition access for the service with the highest priority; co - network competition access for the service with the second - highest priority; and for the priority service of cross - network relay, transmission judgment is made according to the channel occupancy of the destination sub - network, and cross - network competition access is carried out.

[0019] Further preferably, the service queue includes a full - network broadcast service queue, a time - sharing telemetry service queue, other periodic service queues, burst service queues, and cross - network relay service queues;

[0020] The full - network broadcast service queue is used to cache network control information;

[0021] The time - sharing telemetry service queue is used to cache network telemetry information;

[0022] The other periodic service queues are used to cache specific periodic application services;

[0023] The burst service queue is used to cache broadband intelligence information generated by reconnaissance payloads;

[0024] The cross - network relay service queue is used to cache cross - network relay forwarding messages of other nodes.

[0025] Further preferably, in S2, the synchronous network access processing for each accessed sub - network includes: searching for network signals according to the hybrid access protocol, where the network signal search is that the node detects the specific hopping frequency pattern and / or spreading code sequence of each sub - network broadcast message, performs hopping frequency synchronization and pseudo - code sequence synchronization, corrects the local clock through one - way time calibration and RTT round - trip time calibration methods, completes initial synchronization and fine synchronization, and realizes time - slot alignment.

[0026] Further preferably, in S3, preemptive contention access is performed on the service with the highest priority; according to the service arrival time, the nearest multi-user polling period and multi-user contention period are preempted; among them, when the service with the highest priority is sent, it is accompanied by a random delay jitter, so that the frequency hopping patterns of periodic services and burst services are inconsistent, and the receiving end can distinguish the frequency hopping patterns and perform parallel reception. It should be noted that the transmitting end introduces controllable random delay jitter according to different types of periodic services or burst services to generate different frequency hopping patterns, so that the receiving end can distinguish them during reception. After time synchronization, multi-channel parallel transmission is adopted; at the same time, since the receiving end is paired with the transmitting end, the receiving end is required to also have the ability of multi-channel access and parallel reception.

[0027] Further preferably, in S3, for the service with the second highest priority, co-network contention access is performed, including:

[0028] Statistical priority multiple access is used for contention access, including queue inspection according to service type and priority. If there is a service and the channel occupancy is less than the transmission threshold, transmission judgment is performed according to the transmission threshold of the corresponding queue; if the channel occupancy ≥ the transmission threshold, backoff is performed.

[0029] The present invention also provides a manned and unmanned elastic ad hoc network system based on a multi-channel access structure, which is networked by a hierarchical clustering structure, including a core layer network, a backbone layer network, a physical clustering network, and a logical clustering network;

[0030] The core layer network is deployed in the security area and serves as a manned node, and the manned node is used for remote control, telemetry, network control, and task allocation of all unmanned nodes;

[0031] The backbone layer network is deployed in the contention area and consists of elected cluster head nodes, forming area coverage for all unmanned nodes;

[0032] The physical clustering network is deployed within the communication coverage of the cluster head in the battle area and is used to execute the combat tasks distributed by the manned node or the cluster head node. According to the hybrid access control method described in any one of the above claims 1-5, a multi-channel access structure is adopted to implement FDMA for each cluster frequency grouping network, inter-cluster communication. The multi-channel access structure makes each cluster relatively independent, and enables the members within the cluster to share the cluster-internal shared channel in a time-division manner under the TDMA resource planning to perform situation sharing, relative ranging, and backhaul telemetry information;

[0033] The logical clustering network performs task division, member admission judgment, establishment, maintenance, and shutdown of task subnets by the cluster head nodes elected by the manned nodes.

[0034] Further preferably, the multi-channel access structure adopts a combination of TDMA and FDMA access methods to divide the time-frequency two-dimensional resources into four-level access structures such as channels, time frames, time periods, and time slots, to achieve frequency division multiplexing control, periodic update control, service classification control, and time division multiplexing control.

[0035] Further preferably, the frequency division multiplexing control is used to divide the users of the whole network into multiple clusters according to the principle of task grouping or geographical coverage, and the user groups of each cluster share a wireless channel. The cluster adopts a pre-planning or dynamic allocation method to allocate resources, so that small-scale users share a single wireless channel;

[0036] The periodic update control; divides the wireless channel into a periodic updated time frame structure to meet the service refresh rate requirements of the periodic services of measurement and control and network control;

[0037] The service classification control divides each time frame into three time periods: full network broadcast, multi-user polling and multi-user competition. The full network broadcast period is used for service distribution of manned nodes or cluster head nodes; the multi-user polling period uses TDMA to access the channel and supports telemetry information return; the multi-user competition period uses competition to access the shared channel and supports image, video and other service return.

[0038] The time division multiplexing control divides the resources of the multi-user polling period into several time slots, and each subnet user occupies one of the time slots, thereby realizing user-oriented fair scheduling.

[0039] The hybrid access control method and the flexible ad hoc network system with or without personnel based on a multi-channel access structure provided by the embodiments of the present invention have the following beneficial effects:

[0040] 1) The unmanned cluster elastic self-organizing network system adopts a hierarchical structure to form a network. By limiting the size of cluster members through network clustering, the signaling overhead within the cluster can be reduced, the channel bandwidth of cluster members can be increased, and higher-speed service transmission can be supported. The clusters are connected in series through the cluster head and its communication link to achieve inter-cluster communication, which can meet the functions of flexible networking, rapid reconstruction and dynamic resource allocation.

[0041] 2) Multi-channel access structure, combining TDMA and FDMA access methods, divides the time-frequency two-dimensional resources into four levels of access structure, namely channel, time frame, time period and time slot, which respectively support access control functions such as frequency division multiplexing, periodic update, service classification and time division multiplexing, and have the service carrying capacity of multiple QoS indicators.

[0042] 3) Hybrid access control method, which performs multi-service scheduling based on four-level identifiers such as subnet address, user address, service type, and QoS priority, supports multi-frequency three-dimensional networking, periodic polling measurement and control, low-latency user access, and broadband service backhaul, so as to achieve the adaptive transmission function of unmanned / manned cluster networking for latency, bandwidth, networking capacity, and QoS guarantee.

[0043] 4) Multi-user contention access method, which performs contention access in units of time slots, sorts queues according to service priorities, and performs multi-class service scheduling through preemptive contention, same-network contention, different-network contention, etc., to meet the service requirements of latency-sensitive, bandwidth integration, and cross-network relay respectively, and realizes statistical multiplexing, traffic control, and traffic shaping of time slot resources.

[0044] 5) Preemptive contention access method. For the highest-priority service that is latency-sensitive, it can preempt the nearest multi-user polling time slot and multi-user contention time slot, supports service sending with random latency jitter, enables the receiving end to perform frequency-hopping pattern discrimination and parallel reception, and realizes statistical multiplexing of a single time slot. Solve the problems of limited network scale and capacity bottleneck in existing ad hoc networks, and meet the requirements of large-scale networking, flexible clustering, and partition service switching for unmanned / manned cluster communication.

[0045] Additional aspects and advantages of the present invention will be given in part in the following description, become apparent in part from the following description, or be understood through the practice of the present invention. Brief Description of the Drawings

[0046] The above and / or additional aspects and advantages of the present invention will become apparent and be readily understood from the description of the embodiments in conjunction with the following drawings, where:

[0047] Figure 1 is the multi-channel access structure in the unmanned / manned elastic ad hoc network system based on the multi-channel access structure provided by the present invention.

[0048] Figure 2 is the flowchart of the hybrid access control method provided by the present invention. Detailed Description of the Embodiments

[0049] The embodiments of the present invention will be described in detail below. Examples of the embodiments are shown in the drawings, where the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the drawings are exemplary and are intended to explain the present invention and should not be construed as limiting the present invention.

[0050] To meet the requirements of flexible and mobile, autonomous and collaborative network topology control and resource allocation for scale expansion, some unmanned cluster communication systems adopt a hierarchical structure for networking. By restricting the scale of members within a cluster through network clustering, the signaling overhead within the cluster can be reduced, the channel bandwidth of cluster members can be increased, and the transmission of higher-rate services can be supported. By connecting each cluster through the cluster head and its communication link to achieve inter-cluster communication, functions such as flexible networking, rapid reconstruction, and dynamic resource allocation can be satisfied.

[0051] The unmanned and manned elastic self-organizing network system based on a multi-channel access structure provided by the embodiments of the present invention, wherein the hierarchical network topology is divided into a four-layer networking architecture, including: the core layer network, the backbone layer network, the physical clustering network, and the logical clustering network, etc. The functional compositions of each layer of the network are described as follows.

[0052] (1) Core layer network

[0053] The core layer network is composed of manned nodes such as helicopters and ground control stations, which are deployed in a safe area and are responsible for remote control, telemetry, network control, and task allocation of all unmanned nodes. The remote control and telemetry of unmanned nodes by manned nodes adopt a networked measurement and control mode. The manned nodes are connected to the cluster head, and then the cluster head performs multi-hop broadcasting, which can reduce the bandwidth requirements of the measurement and control channels.

[0054] The network control of the clustering network by manned nodes adopts a dedicated control channel to distribute network control information to the cluster head nodes, supporting functions such as task-driven networking, dynamic resource allocation, and adaptive frequency planning.

[0055] The task allocation of manned nodes to the unmanned cluster adopts the method of logical clustering, and distributes task information to a group of execution units in a multicast manner, supporting functions such as task subnet establishment, task subnet maintenance, and task subnet shutdown.

[0056] In addition, multiple manned nodes can adopt core network connections for tactical interconnection to perform network control signaling interaction, supporting functions such as online task planning, subnet merging / splitting, and task handover.

[0057] (2) Backbone layer network

[0058] The backbone layer network is composed of cluster head nodes dynamically and preferably generated by the clustering network, which are deployed in a competitive area and are within the communication coverage of manned nodes. It is responsible for member management, resource management, and routing management of the clustering network, and is also responsible for inter-cluster communication.

[0059] The inter-cluster communication of the backbone layer network adopts a dedicated channel, supporting air relay and backbone network connection, forming area coverage for all unmanned nodes, and meeting the tactical coordination and service transmission requirements across domains and clusters.

[0060] (3) Physical clustering network

[0061] The physical clustering network consists of in-cluster members that share a set of wireless channel resources, are deployed in the combat area, and are within the communication coverage of the cluster head, responsible for executing combat tasks distributed by manned nodes or cluster head nodes.

[0062] Under the TDMA resource planning, in-cluster members occupy the in-cluster shared channel at different times for situation sharing and relative ranging, and at the same time support the backhaul of telemetry information and service information such as pictures / videos.

[0063] (4) Logical clustering network

[0064] When the scale of the physical clustering network is large, in-cluster members can perform task grouping and execute multiple combat tasks simultaneously. The member grouping oriented to tasks forms a logical clustering network, which is distinguished by multicast addresses. The group adopts a multicast security mechanism to share task information and shields it from members outside the cluster.

[0065] The logical clustering network is subject to task division, member admission, and security control by manned nodes or cluster head nodes, and supports functions such as task subnet establishment, task subnet maintenance, and task subnet shutdown.

[0066] As Figure 1 shown, another embodiment of this application proposes a multi-channel access structure.

[0067] The resource allocation of existing flat ad hoc networks usually adopts a single-channel access architecture to realize the multi-user sharing of wireless channel resources and the point-to-multipoint transmission function. The multiple access of flat ad hoc networks usually adopts time division multiple access (TDMA) or contention access (such as CSMA, SPMA, etc.) to share a single channel resource. Limited by the total capacity of a single wireless channel, the networking capacity of flat ad hoc networks is limited, and performance indicators such as network throughput, user rate, and access delay deteriorate as the number of users increases.

[0068] For the resource allocation of elastic ad hoc networks, a multi-channel access structure is adopted to implement frequency division networking (FDMA) for each cluster. The inter-cluster communication uses dedicated channels to support cross-domain and cross-cluster transmission; the multi-channel access structure makes each cluster relatively independent, forming a multi-subnet access structure, and the resources within the cluster are flexibly allocated without interference.

[0069] The multi-channel access structure combines two access methods of TDMA and FDMA, divides the time-frequency two-dimensional resources into a 4-level access structure of channels, time frames, time periods, and time slots, and supports access control functions such as frequency division multi-networking, periodic update, service classification, and time division multiplexing respectively.

[0070] Frequency-division multi-network divides all network users into multiple clusters according to principles such as task grouping or geographical coverage. Users in each cluster share a wireless channel, and pre-planned or dynamic allocation methods are used for resource allocation within the cluster to enable a small number of users to share a single wireless channel, achieving the goals of shortening access delay, increasing user bandwidth, and expanding network capacity.

[0071] Periodic update divides the wireless channel into a time-frame structure with periodic updates according to the measurement and control update rate of the manned or unmanned cluster (usually 10 Hz) to meet the service refresh rate requirements of periodic services such as measurement and control and network control.

[0072] Service classification divides each time frame into three time slots: full-network broadcast, multi-user polling, and multi-user competition. The full-network broadcast time slot is used for service distribution by manned nodes or cluster head nodes, including service types such as remote control information and network control information; the multi-user polling time slot accesses the channel using the TDMA method and mainly supports the return of telemetry information; the multi-user competition time slot accesses the shared channel using a competition method and mainly supports the return of services such as images and videos.

[0073] Time-division multiplexing divides the resources of the multi-user polling time slot into several time slots, and each subnet user occupies one of them to achieve fair scheduling for users.

[0074] The above multi-channel access structure uses a structured channel modeling method for hierarchical classification and deployment of wireless channel resources, supports hybrid access control for multiple users and multiple services, and achieves reasonable resource allocation and meets the QoS performance index requirements of multiple types of services.

[0075] To achieve large-scale networking, periodic measurement and control, and low-latency, high-bandwidth image / video service return of the manned and unmanned cluster elastic self-organizing network system, based on the multi-channel access structure of the elastic self-organizing network, the present invention proposes an FTSPMA hybrid access control method. Service scheduling is carried out according to four-level identifiers such as subnet address (SNID: Subnet Identification)-user address (UMAC: User MAC Address)-service type (STI: Service Type Identification)-QoS priority (QoI: Quality of Service Identification), supporting multi-frequency three-dimensional networking, periodic polling measurement and control, low-latency user access, and broadband service return, thereby realizing the adaptive transmission function of the manned and unmanned cluster networking for delay, bandwidth, network capacity, and QoS guarantee. The FTSPMA hybrid access control method for hierarchical adaptive transmission uses service identification for multi-queue scheduling and channel access control, including the following processing steps.

[0076] As Figure 2As shown in the figure, another embodiment of the present invention provides a hybrid access control method, which performs service scheduling according to the set 4-level identifier. The 4-level identifier includes subnet address, user address, service type, and QOS priority, and specifically includes the following steps:

[0077] S1. In the initialization stage, configure multiple service queues and their buffer spaces;

[0078] The service queues include a network-wide broadcast service queue, a time-sharing telemetry service queue, other periodic service queues, burst service queues, and cross-network relay service queues;

[0079] The network-wide broadcast service queue is used to cache network control information;

[0080] The time-sharing telemetry service queue is used to cache network telemetry information;

[0081] The other periodic service queues are used to cache specific periodic application services;

[0082] The burst service queues are used to cache broadband intelligence information generated by reconnaissance payloads;

[0083] The cross-network relay service queues are used to cache cross-network relay forwarding messages of other nodes.

[0084] S2. Perform synchronous network access processing on each subnet accessing the network;

[0085] The synchronous network access processing for each subnet accessing the network includes: searching for network signals according to the hybrid access protocol. Among them, the network signal search is that the node detects the specific hopping frequency pattern and / or spreading code sequence of the broadcast messages of each subnet, performs hopping frequency synchronization and pseudo-code sequence synchronization, corrects the local clock through one-way time calibration and RTT round-trip time calibration methods, completes initial synchronization and fine synchronization, and realizes time slot alignment.

[0086] S3. Use a combination of network-wide broadcast periods, multi-user polling periods, and multi-user contention periods to perform multi-service queue scheduling in units of periods and time slots;

[0087] Preemptive contention access is implemented for the service with the highest priority; according to the service arrival time, preempt the nearest multi-user polling period and multi-user contention period; among them, when the service with the highest priority is sent, it has a random delay jitter, so that the hopping frequency patterns of periodic services and burst services are inconsistent, and the receiving end can distinguish the hopping frequency patterns and perform parallel reception. It should be noted that the transmitting end generates different hopping frequency patterns according to different types of periodic services or burst services to introduce controllable random delay jitter, so that the receiving end can distinguish when receiving. After time synchronization, multi-channel parallel reception is adopted; since the receiving end and the transmitting end are paired for use, it is required that the receiving end also has the ability of multi-channel access and parallel reception.

[0088] During the full - network broadcast period, when there are data packets in the full - network broadcast service queue, the full - network time - slot allocation table is used for full - network broadcast service scheduling;

[0089] During the multi - user polling period, the sub - network time - slot allocation table is used for periodic service queue scheduling of the time - sharing telemetry service queue or other periodic service queues;

[0090] During the multi - user competition period, competitive access is carried out, specifically including: preemptive competitive access for the service with the highest priority; co - network competitive access for the service with the second - highest priority; and cross - network relay priority service, and transmission judgment is made according to the channel occupancy of the destination sub - network for heterogeneous network competitive access.

[0091] In S3, the co - network competitive access for the service with the second - highest priority includes:

[0092] Statistical priority multiple access is used for competitive access, including queue inspection according to service type and priority. If there is a service and the channel occupancy is less than the transmission threshold, transmission judgment is made according to the transmission threshold of the corresponding queue; if the channel occupancy ≥ transmission threshold, back - off is performed.

[0093] The present invention also provides a manned - unmanned elastic ad - hoc network system based on a multi - channel access structure, which is networked by a hierarchical and clustered structure, including a core - layer network, a backbone - layer network, a physical - clustered network, and a logical - clustered network;

[0094] The core - layer network is deployed in the security area and serves as a manned node, which is used for remote control, telemetry, network control, and task assignment of all unmanned nodes;

[0095] The backbone - layer network is deployed in the competition area and consists of elected cluster - head nodes, forming area coverage of all unmanned nodes;

[0096] The physical - clustered network is deployed within the communication coverage of the cluster - head in the battle area and is used to execute combat tasks distributed by the manned node or the cluster - head node. According to the hybrid access control method described in any one of claims 1 - 5 above, a multi - channel access structure is used to achieve FDMA for each cluster frequency grouping network, inter - cluster communication. The multi - channel access structure makes each cluster relatively independent, and cluster members share the cluster - internal shared channel in a time - sharing manner under TDMA resource planning for situation sharing, relative ranging, and back - transmission of telemetry information;

[0097] The logical - clustered network is used for task division, member admission judgment, establishment, maintenance, and shutdown of task sub - networks by the cluster - head nodes elected by the manned nodes.

[0098] Further preferably, the multi-channel access structure divides the time-frequency two-dimensional resources into four-level access structures such as channels, time frames, time periods, and time slots by adopting a combined access method of TDMA and FDMA, so as to realize frequency-division multi-network control, periodic update control, service classification control, and time-division multiplexing control.

[0099] Further preferably, the frequency-division multi-network control is used to divide all network users into multiple clusters according to the task grouping or geographical coverage principle. The user groups in each cluster share a wireless channel, and pre-planning or dynamic allocation methods are used for resource allocation within the cluster to realize small-scale user sharing of a single wireless channel;

[0100] The periodic update control divides the wireless channel into a time frame structure with periodic updates to meet the service refresh rate requirements of periodic services such as measurement and control and network control;

[0101] The service classification control divides each time frame into three time periods: full-network broadcast, multi-user polling, and multi-user competition. Among them, the full-network broadcast time period is used for service distribution of manned nodes or cluster head nodes; the multi-user polling time period accesses the channel in the TDMA manner to support the return of telemetry information; the multi-user competition time period accesses the shared channel in a competitive manner to support the return of services such as images and videos.

[0102] The time-division multiplexing control divides the resources in the multi-user polling time period into several time slots, and each subnet user occupies one of the time slots to realize fair scheduling for users.

[0103] In the description of this specification, the descriptions with reference to terms such as "one embodiment", "some embodiments", "example", "specific example", or "some examples" mean that the specific features, structures, materials, or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described can be combined in a suitable manner in any one or more embodiments or examples.

[0104] Although the embodiments of the present invention have been shown and described above, it can be understood that the above embodiments are exemplary and should not be construed as limiting the present invention. Those of ordinary skill in the art can make changes, modifications, substitutions, and variations to the above embodiments within the scope of the present invention without departing from the principle and purpose of the present invention. The scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A hybrid access control method, characterized in that, Specifically, it includes the following steps: S1. In the initialization stage, configure multiple service queues and their cache spaces; S2. Perform synchronous network access processing on each subnet accessing the network; S3. Use a combination of full-network broadcast periods, multi-user polling periods, and multi-user contention periods in units of time periods and time slots for multi-service queue scheduling; In the full-network broadcast period, when there are data packets in the full-network broadcast service queue, use the full-network time slot allocation table for full-network broadcast service scheduling; In the multi-user polling period, use the subnet time slot allocation table to perform periodic service queue scheduling on the time-sharing telemetry service queue or other periodic service queues; In the multi-user contention period, perform contention access, specifically including: performing preemptive contention access on the service with the highest priority; performing co-network contention access on the service with the second-highest priority; for the priority service of cross-network relay, make a transmission judgment according to the channel occupancy of the destination subnet and perform cross-network contention access.

2. The hybrid access control method according to claim 1, wherein The service queues include a full-network broadcast service queue, a time-sharing telemetry service queue, other periodic service queues, burst service queues, and cross-network relay service queues; The full-network broadcast service queue is used to cache network control information; The time-sharing telemetry service queue is used to cache network telemetry information; The other periodic service queues are used to cache specific periodic application services; The burst service queues are used to cache broadband intelligence information generated by reconnaissance payloads; The cross-network relay service queues are used to cache cross-network relay forwarding messages of other nodes.

3. The hybrid access control method according to claim 1, characterized in that, In S2, the synchronous network access processing for each subnet accessing the network includes: performing network signal search according to the hybrid access protocol, where the network signal search is that the node detects the specific hopping frequency pattern and / or spreading code sequence of each subnet broadcast message, performs hopping frequency synchronization and pseudo-code sequence synchronization, corrects the local clock through one-way time calibration and RTT round-trip time calibration methods, and completes initial synchronization and fine synchronization to achieve time slot alignment.

4. The hybrid access control method according to claim 1, wherein In S3, for the service with the highest priority, perform preemptive contention access; according to the service arrival time, preempt the nearest multi-user polling period and multi-user contention period; among them, when the service with the highest priority is sent, it has a random delay jitter, so that the hopping frequency patterns of periodic services and burst services are inconsistent, and the receiving end can distinguish the hopping frequency patterns and perform parallel reception.

5. The hybrid access control method according to claim 1, wherein In S3, for the service with the second-highest priority, perform co-network contention access, including: Use the statistical priority multiple access method for contention access, including performing queue inspection according to the service type and priority. If there is a service, if the channel occupancy is less than the transmission threshold, make a transmission judgment according to the transmission threshold of the corresponding queue; if the channel occupancy ≥ the transmission threshold, perform backoff.

6. An elastic ad-hoc network system with or without people based on a multi-channel access structure, characterized in that, Use a hierarchical and clustered structure for networking, including a core layer network, a backbone layer network, a physical clustering network, and a logical clustering network; The core layer network is deployed in the security area and serves as a manned node, and the manned node is used for remote control, telemetry, network control, and task assignment of all unmanned nodes; The backbone layer network is deployed in the contention area and consists of elected cluster head nodes, forming area coverage for all unmanned nodes; The physical clustering network is deployed within the communication coverage of the cluster head in the combat zone, and is used to perform combat tasks distributed by manned nodes or cluster head nodes. According to the hybrid access control method described in any one of claims 1 to 5 above, a multi-channel access structure is used to implement the frequency packet network FDMA of each cluster, inter-cluster communication, and the multi-channel access structure makes each cluster relatively independent, so that the members in the cluster can occupy the shared channel in the cluster in time-sharing under TDMA resource planning, and carry out situation sharing, relative ranging, and telemetry information transmission. The logical clustering network is composed of a cluster head node elected by human nodes to perform task division, member admission judgment, and the establishment, maintenance and closing of task subnets.

7. The elastic ad-hoc network system with or without people based on a multi-channel access structure according to claim 6, characterized in that The multi-channel access structure adopts a combination of TDMA and FDMA access methods to divide the time-frequency two-dimensional resources into four levels of access structure, namely, channel, time frame, time period, and time slot, to realize frequency division multiplexing control, periodic update control, service classification control, and time division multiplexing control.

8. The elastic ad-hoc network system with or without people based on a multi-channel access structure according to claim 7, characterized in that, The frequency division multiplexing control is used to divide the users of the whole network into multiple clusters according to the principle of task grouping or geographical coverage. The user groups of each cluster share a wireless channel. The cluster adopts pre-planning or dynamic allocation method to allocate resources, so that small-scale users can share a single wireless channel. The periodic update control; divides the wireless channel into a periodic updated time frame structure to meet the service refresh rate requirements of the periodic services of measurement and control and network control; The service classification control divides each time frame into three time periods: full network broadcast, multi-user polling and multi-user competition. The full network broadcast period is used for service distribution of manned nodes or cluster head nodes; the multi-user polling period uses TDMA to access the channel and supports telemetry information return; the multi-user competition period uses competition to access the shared channel and supports image, video and other service return. The time division multiplexing control divides the resources of the multi-user polling period into several time slots, and each subnet user occupies one of the time slots, thereby realizing user-oriented fair scheduling.

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