Hybrid access control methods and unmanned resilient self-organizing network systems based on multi-channel access structures

Abstract

The application provides a hybrid access control method and a manned-unmanned flexible self-organizing 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 buffer spaces thereof; synchronously processing each subnet entering the network; adopting a combination of a network-wide broadcast time period, a multi-user polling time period and a multi-user contention time period to perform multi-service queue scheduling in a time period and a time slot; and the system implements the method in a layered and clustered flexible self-organizing network through the established multi-channel access structure. The application adopts a layered and clustered network architecture and a multi-channel access structure, realizes frequency division group networking and flexible network control of each cluster, adopts a hybrid access control method to realize service classification and scheduling, solves the problems of limited network scale and capacity bottleneck in the existing self-organizing network, and meets the requirements of large-scale networking, flexible clustering and partitioned service exchange of manned-unmanned cluster communication.

Description

Technical Field

[0001] This invention relates to the field of data link communication technology, and in particular to a hybrid access control method and an unmanned flexible self-organizing network system based on a multi-channel access structure. Background Technology

[0002] In the context of cross-domain joint operations involving land, sea, and air, manned and unmanned collaborative networking requires scalable hierarchical and clustered self-organizing network technology to achieve dynamic topology control, wireless resource management, and network capacity enhancement for large-scale self-organizing networks. The high-speed mobility, limited energy, dynamic inter-platform links, and mission-oriented characteristics of unmanned platforms present new challenges to the channel access mechanism of large-scale unmanned swarm self-organizing networks.

[0003] Channel bandwidth is a valuable resource in wireless communication. When multiple users share a wireless channel, simultaneous attempts to access the channel by multiple users will cause data frame collisions and affect reception, resulting in multiple access conflicts. Therefore, wireless communication networks require a reasonable Medium Access Control (MAC) mechanism to allocate wireless channel resources to network users using time division, frequency division, code division, or other methods, enabling users to access the channel in an orderly and coordinated manner, achieving efficient resource sharing. MAC protocol design needs to consider factors such as throughput, fairness, and quality of service.

[0004] Based on the different methods by which nodes acquire channels, MAC protocols can be divided into three categories: fixed allocation MAC protocols, reservation-based MAC protocols, and random contention-based MAC protocols. Fixed allocation protocols employ a static allocation strategy, assigning dedicated channel resources to network nodes. Throughout the communication process, each node exclusively enjoys the allocated frequency, time, codeword, or space resources, thus enabling network nodes to 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), and Space Division Multiple Access (SDMA).

[0005] Reservation MAC protocols are dynamically allocated MAC protocols, which can flexibly allocate channel resources to network nodes based on their service needs and network topology changes. A typical method of reservation MAC protocols is to reserve a channel in advance using short reservation packets. Once a reservation is successful, subsequent packets will be sent without collision. Representative reservation MAC protocols include Packet Reservation Multiple Access (PRMA), Hop Reservation Multiple Access (HRMA), and Collision Avoidance Time Division Multiple Access (CATA).

[0006] Random contention MAC protocols employ a random access strategy, where nodes compete for the right to use the channel. When a node has data to transmit, it immediately or after listening for channel idleness, it randomly accesses the channel with a certain transmission probability. If a collision occurs, an algorithm is used to back off or the probability is directly modified for a subsequent retransmission. Random contention MAC access mechanisms ensure peer-to-peer functionality among network nodes and are suitable for distributed networking environments. Typical random contention access mechanisms include ALOHA, Carrier Sense Multiple Access (CSMA), and Collision Avoidance Multiple Access (MACA).

[0007] Traditional multiple access protocols assume that a channel can only carry a single signal transmission at a time, and the system throughput cannot exceed the maximum link rate. In particular, the throughput of a randomly contention-based channel is limited by the probability of contention collisions. As the number of competing users increases, the probability of transmission failure also increases exponentially, and the system throughput will deteriorate severely.

[0008] Traditional channel multiplexing techniques use time-division, frequency-division, code-division, or statistical multiplexing methods 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] Existing wireless ad hoc networks use a single channel to carry network control signaling and multiple service transmissions, which limits network size and capacity bottlenecks, and does not meet the requirements of large-scale networking, flexible clustering, and regional service switching for both unmanned and manned trunking communication. Summary of the Invention

[0010] The purpose of this invention is to at least address one of the aforementioned technical deficiencies.

[0011] Therefore, one objective of this invention is to propose a hybrid access control method and an unmanned flexible self-organizing network system based on a multi-channel access structure. The system adopts a hierarchical cluster networking architecture and a multi-channel access structure to realize the grouping network of each cluster frequency and flexible networking control, and uses a hybrid access control method to realize service classification scheduling.

[0012] To achieve the above objectives, one embodiment of the present invention provides a hybrid access control method that performs service scheduling based on a set 4-level identifier, wherein the 4-level identifier includes subnet address, user address, service type, and QoS priority, and specifically includes the following steps:

[0013] S1. During the initialization phase, configure multiple business queues and their cache spaces;

[0014] S2. Perform synchronous network access processing on each subnet entering the network;

[0015] S3. Multi-service queue scheduling is carried out by combining network-wide broadcast time periods, multi-user polling time periods, and multi-user contention time periods, based on time periods and time slots.

[0016] During the network-wide broadcast period, when there are data packets in the network-wide broadcast service queue, the network-wide time slot allocation table is used to schedule the network-wide broadcast service.

[0017] During the multi-user polling period, the subnet time slot allocation table is used to periodically schedule the time-division telemetry service queue or other periodic service queues.

[0018] During periods of multi-user contention, contention for access is implemented, specifically including: preemptive contention for access of the highest priority services; intra-network contention for access of the second highest priority services; and inter-network contention for priority services that are relayed across networks, based on the channel occupancy of the destination subnet.

[0019] More preferably, the service queue includes a network-wide broadcast service queue, a time-division telemetry service queue, other periodic service queues, a burst service queue, and a cross-network relay service queue;

[0020] The network-wide 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 from other nodes.

[0025] More preferably, in S2, the process of synchronizing the network access of each subnet includes: performing network signal search according to the hybrid access protocol, wherein the network signal search is the process by which a node detects a specific frequency hopping pattern and / or spreading code sequence of broadcast messages from each subnet, performs frequency hopping synchronization and pseudo-code sequence synchronization, corrects the local clock through one-way time synchronization and RTT round-trip time synchronization, completes initial synchronization and fine synchronization, and achieves time slot alignment.

[0026] Further preferably, in S3, preemptive contention access is implemented for the highest priority service; based on the service arrival time, the nearest multi-user polling period and multi-user contention period are preempted; wherein, the highest priority service is transmitted with random delay jitter, making the frequency hopping patterns of periodic services and bursty services inconsistent, so that the receiver can distinguish the frequency hopping patterns and receive in parallel. It should be noted that the transmitter generates different frequency hopping patterns according to different types of periodic or bursty services, introducing controllable random delay jitter so that the receiver can distinguish them during reception. After time synchronization, multi-channel parallel transmission is adopted; at the same time, since the receiver is used in pairs with the transmitter, the receiver is also required to have the ability to access multiple channels and receive in parallel.

[0027] More preferably, in S3, the implementation of intra-network contention access for services with the next highest priority includes:

[0028] The statistical priority multiple access method is used for contention access, including queue checking based on service type and priority. If a service exists, and the channel occupancy is less than the transmission threshold, the transmission judgment is made according to the transmission threshold of the corresponding queue; if the channel occupancy is greater than or equal to the transmission threshold, backoff is performed.

[0029] The present invention also provides an unmanned flexible self-organizing network system based on a multi-channel access structure, which adopts a hierarchical clustering structure for networking, 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 zone as manned nodes, which are used for remote control, telemetry, network control and task allocation of all unmanned nodes.

[0031] The backbone network is deployed in the competition zone and consists of elected cluster head nodes, forming regional coverage of all unmanned nodes.

[0032] The physical clustering network is deployed within the communication coverage area of ​​the cluster head in the combat zone and is used to perform combat missions distributed by manned nodes or cluster head nodes. According to the hybrid access control method described in any one of claims 1-5, a multi-channel access structure is adopted to realize the FDMA of each cluster frequency group network and inter-cluster communication. The multi-channel access structure makes each cluster relatively independent, and allows members within the cluster to occupy the shared channel within the cluster in a time-division manner under the TDMA resource planning, so as to perform situation sharing, relative ranging, and telemetry information transmission.

[0033] The logical clustering network is characterized by task division, member acceptance judgment, and the establishment, maintenance, and closure of task subnets by a cluster head node elected by human nodes.

[0034] More preferably, the multi-channel access structure adopts a combination of TDMA and FDMA access methods to divide the time-frequency two-dimensional resources into a four-level access structure, namely channel, time frame, time period, and time slot, so as to realize frequency division multiple network control, periodic update control, service classification control and time division multiplexing control.

[0035] More preferably, the frequency division multiple network control is used to divide all network users into multiple clusters according to task grouping or geographical coverage principles. Each cluster of users shares a wireless channel, and resources are allocated within the cluster using pre-planning or dynamic allocation methods, so as to realize that a small number of users share a single wireless channel.

[0036] The periodic update control divides the wireless channel into periodically updated time frame structures to meet the service refresh rate requirements of periodic telemetry and control and network control services.

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

[0038] The time-division multiplexing control divides the resources of the multi-user polling period into several time slots, with each subnet user occupying one time slot, thereby achieving fair scheduling for users.

[0039] The hybrid access control method and the unmanned flexible self-organizing network system based on a multi-channel access structure provided by embodiments of the present invention have the following advantages:

[0040] 1) An unmanned clustered flexible self-organizing network system adopts a hierarchical networking structure. By limiting the size of members within a cluster through network clustering, it can reduce signaling overhead within the cluster, increase the channel bandwidth of cluster members, and support higher-speed service transmission. The clusters are connected in series through the cluster head and its communication link to realize inter-cluster communication, which can meet the functions of flexible networking, rapid reconfiguration, and dynamic resource allocation.

[0041] 2) Multi-channel access structure: Combining TDMA and FDMA access methods, the time and frequency two-dimensional resources are divided into four levels of access structure: channel, time frame, time period, and time slot. It supports access control functions such as frequency division multiple network, periodic update, service classification and time division multiplexing, and has the service carrying capacity of multiple QoS indicators.

[0042] 3) Hybrid access control method: Based on four levels of identifiers, including subnet address, user address, service type, and QoS priority, multi-service scheduling is performed. It supports multi-frequency three-dimensional networking, periodic polling monitoring and control, low-latency user access, and broadband service backhaul, thereby realizing adaptive transmission function for both unmanned and manned trunking networks with consideration for latency, bandwidth, network capacity, and QoS guarantees.

[0043] 4) Multi-user contention access method: Contention access is carried out on a time slot basis, and queues are sorted according to service priority. Various service scheduling methods such as preemptive contention, intra-network contention, and inter-network contention are used to meet the service requirements of latency-sensitive, bandwidth integration, and cross-network relay respectively, and realize the statistical reuse of time slot resources, traffic control, and traffic shaping.

[0044] 5) The preemptive contention access method, for the highest priority services sensitive to latency, can preempt the nearest multi-user polling time slot and multi-user contention time slot, supporting service transmission with random latency jitter. This enables the receiver to distinguish frequency hopping patterns and receive data in parallel, achieving statistical multiplexing of a single time slot. It solves the problems of limited network size and capacity bottlenecks in existing ad hoc networks, meeting the needs of large-scale networking, flexible clustering, and partitioned service switching for both automated and unmanned trunking communication.

[0045] Additional aspects and advantages of the invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Attached Figure Description

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

[0047] Figure 1 This invention provides a multi-channel access structure for an unmanned, flexible, self-organizing network system based on a multi-channel access structure.

[0048] Figure 2 A flowchart of the hybrid access control method provided by the present invention. Detailed Implementation

[0049] Embodiments of the present invention are described in detail below, examples of which are illustrated in the accompanying drawings, wherein 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 accompanying drawings are exemplary and intended to explain the present invention, and should not be construed as limiting the present invention.

[0050] To meet the requirements of flexible, autonomous, and collaborative network topology control and scalable resource allocation, unmanned trunking communication systems adopt a hierarchical networking structure. By limiting the size of members within a cluster through network clustering, signaling overhead within the cluster can be reduced, channel bandwidth of cluster members can be increased, and higher-speed service transmission can be supported. Clusters are connected in series through the cluster head and its communication links to achieve inter-cluster communication, enabling flexible networking, rapid reconfiguration, and dynamic resource allocation.

[0051] The unmanned flexible self-organizing network system based on a multi-channel access structure provided in this embodiment of the invention has a hierarchical network topology divided into a four-layer network architecture, including: core layer network, backbone layer network, physical cluster network and logical cluster network. The functional composition of each layer network is described as follows.

[0052] (1) Core layer network

[0053] The core network consists of manned nodes such as helicopters and ground control stations, deployed in a secure area, responsible for remote control, telemetry, networking control, and task allocation of all unmanned nodes. Remote control and telemetry between manned and unmanned nodes employs a networked telemetry and control mode, with manned nodes connecting to the cluster head, which then performs multi-hop broadcasts, reducing bandwidth requirements for the telemetry and control channels.

[0054] The human node uses a dedicated control channel to control the clustering network, distributing network control information to the cluster head node, and supports functions such as task-driven networking, dynamic resource allocation, and adaptive frequency planning.

[0055] Manned nodes use logical clustering to allocate tasks to unmanned clusters, distributing task information to a group of execution units via multicast. This supports functions such as task subnet establishment, task subnet maintenance, and task subnet shutdown.

[0056] In addition, multiple manned nodes can be interconnected tactically via the core network to exchange network control signaling, and support functions such as online task planning, subnet merging / separation, and task handover.

[0057] (2) Backbone layer network

[0058] The backbone network consists of cluster head nodes dynamically selected from the cluster network. Deployed in the competition area, within the communication coverage of manned nodes, it is responsible for member management, resource management, and routing management of the cluster network, as well as inter-cluster communication.

[0059] Inter-cluster communication in the backbone network uses dedicated channels, supports air relay and backbone network connection, forms regional coverage for all unmanned nodes, and meets the needs of cross-domain and cross-cluster tactical coordination and service transmission.

[0060] (3) Physical clustering network

[0061] A physical cluster network consists of cluster members that share a set of wireless channel resources. It is deployed in the combat zone, within the communication coverage of the cluster head, and is responsible for carrying out combat missions distributed by manned nodes or the cluster head node.

[0062] Under TDMA resource planning, members within the cluster occupy the shared channel within the cluster in a time-division manner to perform situational awareness sharing and relative ranging, while also supporting the backhaul of telemetry information and service information such as images / videos.

[0063] (4) Logical clustering network

[0064] When the physical clustering network is large, members within a cluster can be grouped into task groups to execute multiple combat missions simultaneously. Task-oriented member groups form a logical clustering network, distinguished by multicast addresses. Within a group, multicast security mechanisms are used to share task information, while external members are shielded from access.

[0065] Logical clustering networks are used by human nodes or cluster heads to perform task division, member admission, and security control, and support functions such as task subnet establishment, task subnet maintenance, and task subnet shutdown.

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

[0067] Existing planar ad hoc networks typically employ a single-channel access architecture for resource allocation, enabling multi-user sharing of wireless channel resources and point-to-multipoint transmission. Multiple access in planar ad hoc networks usually utilizes Time Division Multiple Access (TDMA) or contention-based access (such as CSMA, SPMA, etc.) to share a single channel resource. Due to the limitation of the total capacity of a single wireless channel, the network capacity of planar ad hoc networks is limited, and performance indicators such as network throughput, user rate, and access latency deteriorate as the number of users increases.

[0068] The resource allocation of the flexible self-organizing network adopts a multi-channel access structure to realize the frequency grouping network (FDMA) of each cluster. 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 TDMA and FDMA access methods, dividing the two-dimensional time-frequency resources into four levels of access structure: channel, time frame, time period, and time slot. It supports access control functions such as frequency division multiple network, periodic update, service classification, and time division multiplexing.

[0070] Frequency division multiple network (FDM) divides all network users into multiple clusters based on principles such as task grouping or geographical coverage. Each cluster's user groups share a single wireless channel. Within each cluster, resources are allocated using pre-planning or dynamic allocation methods, enabling small-scale users to share a single wireless channel. This achieves the goals of reducing access latency, increasing user bandwidth, and expanding network capacity.

[0071] Periodic updates are a time frame structure that divides the wireless channel into periodic update frames according to the update rate of the telemetry and control system with or without a cluster (usually 10Hz), in order to meet the service refresh rate requirements of periodic services such as telemetry and control and network control.

[0072] The service classification divides each time frame into three periods: network-wide broadcast, multi-user polling, and multi-user contention. The network-wide broadcast period is used for service distribution to manned nodes or cluster heads, including remote control information, network control information, and other service types. The multi-user polling period uses TDMA to access the channel and mainly supports telemetry information backhaul. The multi-user contention period uses contention to access the shared channel and mainly supports image, video, and other service backhaul.

[0073] Time-division multiplexing divides the resources of a multi-user polling period into several time slots, with each subnet user occupying one time slot, thus achieving fair scheduling for users.

[0074] The aforementioned multi-channel access structure employs a structured channel modeling method for hierarchical and categorized deployment of wireless channel resources, supporting hybrid access control for multiple users and services, achieving reasonable resource allocation and meeting the QoS performance requirements of various service types.

[0075] To achieve large-scale networking, periodic monitoring and control, and low-latency, high-bandwidth image / video service backhaul in manned / unmanned cluster resilient ad hoc networks, this invention proposes a hybrid FTSPMA access control method based on the multi-channel access structure of resilient ad hoc networks. This method uses a four-level identifier system—Subnet Identification (SNID), User MAC Address (UMAC), Service Type Identification (STI), and Quality of Service Identification (QoI)—for service scheduling. It supports multi-frequency three-dimensional networking, periodic polling monitoring and control, low-latency user access, and broadband service backhaul, thereby achieving adaptive transmission functionality for manned / unmanned cluster networks that guarantees latency, bandwidth, network capacity, and QoS. The FTSPMA hybrid access control method for hierarchical adaptive transmission employs service identification for multi-queue scheduling and channel access control, and includes the following processing steps.

[0076] like Figure 2As shown, another embodiment of the present invention provides a hybrid access control method, which performs service scheduling based on a set 4-level identifier, wherein the 4-level identifier includes subnet address, user address, service type and QoS priority, and specifically includes the following steps:

[0077] S1. During the initialization phase, configure multiple business queues and their cache spaces;

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

[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 queue is used to cache broadband intelligence information generated by reconnaissance payloads;

[0083] The cross-network relay service queue is used to cache cross-network relay forwarding messages from other nodes.

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

[0085] The process of synchronizing each subnet into the network includes: performing network signal search according to the hybrid access protocol, wherein the network signal search involves the node detecting specific frequency hopping patterns and / or spreading code sequences of broadcast messages from each subnet, performing frequency hopping synchronization and pseudo-code sequence synchronization, correcting the local clock through one-way time synchronization and RTT round-trip time synchronization, completing initial synchronization and fine synchronization, and achieving time slot alignment.

[0086] S3. Multi-service queue scheduling is carried out by combining network-wide broadcast time periods, multi-user polling time periods, and multi-user contention time periods, based on time periods and time slots.

[0087] The system employs a preemptive contention access mechanism for the highest priority services. Based on service arrival times, it preempts the nearest multi-user polling and multi-user contention periods. The highest priority services are transmitted with random delay jitter, causing inconsistencies in the frequency hopping patterns between periodic and bursty services. This allows the receiver to distinguish between the frequency hopping patterns and receive data in parallel. It should be noted that the transmitter generates different frequency hopping patterns based on the type of periodic or bursty service, introducing controllable random delay jitter so that the receiver can differentiate them during reception. After time synchronization, multi-channel parallel reception is employed. Since the receiver is paired with the transmitter, it must also possess multi-channel access and parallel reception capabilities.

[0088] During the network-wide broadcast period, when there are data packets in the network-wide broadcast service queue, the network-wide time slot allocation table is used to schedule the network-wide broadcast service.

[0089] During the multi-user polling period, the subnet time slot allocation table is used to periodically schedule the time-division telemetry service queue or other periodic service queues.

[0090] During periods of multi-user contention, contention for access is implemented, specifically including: preemptive contention for access of the highest priority services; intra-network contention for access of the second highest priority services; and inter-network contention for priority services that are relayed across networks, based on the channel occupancy of the destination subnet.

[0091] In S3, the implementation of intra-network contention access for services with the next highest priority includes:

[0092] The statistical priority multiple access method is used for contention access, including queue checking based on service type and priority. If a service exists, and the channel occupancy is less than the transmission threshold, the transmission judgment is made according to the transmission threshold of the corresponding queue; if the channel occupancy is greater than or equal to the transmission threshold, backoff is performed.

[0093] The present invention also provides an unmanned flexible self-organizing network system based on a multi-channel access structure, which adopts a hierarchical clustering structure for networking, including a core layer network, a backbone layer network, a physical clustering network, and a logical clustering network;

[0094] The core layer network is deployed in the security zone as manned nodes, which are used for remote control, telemetry, network control and task allocation of all unmanned nodes.

[0095] The backbone network is deployed in the competition zone and consists of elected cluster head nodes, forming regional coverage of all unmanned nodes.

[0096] The physical clustering network is deployed within the communication coverage area of ​​the cluster head in the combat zone and is used to perform combat missions distributed by manned nodes or cluster head nodes. According to the hybrid access control method described in any one of claims 1-5, a multi-channel access structure is adopted to realize the FDMA of each cluster frequency group network and inter-cluster communication. The multi-channel access structure makes each cluster relatively independent, and allows members within the cluster to occupy the shared channel within the cluster in a time-division manner under the TDMA resource planning, so as to perform situation sharing, relative ranging, and telemetry information transmission.

[0097] The logical clustering network is characterized by task division, member acceptance judgment, and the establishment, maintenance, and closure of task subnets by a cluster head node elected by human nodes.

[0098] More preferably, the multi-channel access structure adopts a combination of TDMA and FDMA access methods to divide the time-frequency two-dimensional resources into a four-level access structure, namely channel, time frame, time period, and time slot, so as to realize frequency division multiple network control, periodic update control, service classification control and time division multiplexing control.

[0099] More preferably, the frequency division multiple network control is used to divide all network users into multiple clusters according to task grouping or geographical coverage principles. Each cluster of users shares a wireless channel, and resources are allocated within the cluster using pre-planning or dynamic allocation methods, so as to realize that a small number of users share a single wireless channel.

[0100] The periodic update control divides the wireless channel into periodically updated time frame structures to meet the service refresh rate requirements of periodic telemetry and control and network control services.

[0101] The service classification control divides each time frame into three periods: network-wide broadcast, multi-user polling, and multi-user contention. The network-wide broadcast period is used for service distribution to manned nodes or cluster heads. The multi-user polling period uses TDMA to access the channel and supports telemetry information backhaul. The multi-user contention period uses contention to access the shared channel and supports image, video, and other service backhaul.

[0102] The time-division multiplexing control divides the resources of the multi-user polling period into several time slots, with each subnet user occupying one time slot, thereby achieving fair scheduling for users.

[0103] In the description of this specification, references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0104] Although embodiments of the present invention have been shown and described above, it is to be understood that the above embodiments are exemplary and should not be construed as limiting the present invention. Those skilled 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 principles and spirit of the invention. The scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A mixed access control method, characterized by, Specifically comprising the following steps: S1, in the initialization phase, configuring a plurality of service queues and their cache spaces; S2, synchronously processing each subnet in the network; S3, in time periods and time slots, using a combination of network-wide broadcast time periods, multi-user polling time periods, and multi-user contention time periods for multi-service queue scheduling; In the network-wide broadcast time period, when there are data packets in the network-wide broadcast service queue, a network-wide time slot allocation table is used for network-wide broadcast service scheduling; In the multi-user polling time period, a subnet time slot allocation table is used to periodically schedule the time-sharing telemetry service queue or other periodic service queue; In the multi-user contention time period, contention access is performed, specifically including: implementing preemptive contention access for the highest priority service; implementing same-network contention access for the second-highest priority service; and implementing different-network contention access for the priority service of cross-network relay according to the channel occupancy of the destination subnet for transmission judgment.

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

3. The hybrid access control method of claim 1, wherein, In S2, the synchronous network entry processing of each subnet in the network includes: performing network signal search according to the hybrid access protocol, wherein the network signal search is node detection of the specific frequency hopping pattern and / or spread spectrum code sequence of each subnet broadcast message, frequency hopping synchronization and pseudo code sequence synchronization, correction of the local clock through one-way time correction and RTT round-trip time correction, completion of initial synchronization and fine synchronization, and time slot alignment.

4. The hybrid access control method of claim 1, wherein, In S3, the highest priority service implements preemptive contention access; according to the service arrival time, the nearest multi-user polling time period and multi-user contention time period are preempted; wherein the highest priority service is sent with random time delay jitter, so that the frequency hopping patterns of periodic services and burst services are inconsistent, and the receiving end can distinguish and receive in parallel.

5. The hybrid access control method of claim 1, wherein, In S3, the second-highest priority service implements same-network contention access, including: Statistical priority multiple access is used for contention access, including queue checking according to service type and priority, sending judgment according to the sending threshold of the corresponding queue if there is service and the channel occupancy is less than the sending threshold; if the channel occupancy is greater than or equal to the sending threshold, back off.

6. A multi-channel access structure based human-free elastic self-organizing network system, characterized by, The network is formed by using a hierarchical and clustered structure, including a core layer network, a backbone layer network, a physical clustered network, and a logical clustered network; The core layer network is deployed in a safe area and serves as a manned node, which is used for remote control and telemetry, network control, and task allocation of all unmanned nodes; The backbone layer network is deployed in a contention area and is composed of cluster head nodes elected to form regional coverage of all unmanned nodes; The physical cluster network is deployed within the communication coverage of the cluster head in the battle area, and is used to perform the combat task distributed by the manned node or the cluster head node. The hybrid access control method according to any one of claims 1-5 is used to realize the frequency division multiple network (FDMA) of each cluster, inter-cluster communication, and multi-channel access structure, which makes each cluster relatively independent, and makes the members in the cluster occupy the shared channel in the cluster under the time division multiple access (TDMA) resource planning to share the situation, relative ranging, and back telemetry information. The logical cluster network is used to perform task division, member admission judgment, task sub-network establishment, maintenance, and closure by the cluster head node elected by the manned node.

7. The multi-channel access structure based human-in-the-loop flexible ad hoc network system of claim 6, wherein, The multi-channel access structure divides the time-frequency two-dimensional resource into four-level access structures of channel, time frame, time period, and time slot by combining TDMA and FDMA, and realizes frequency division multiple network control, periodic update control, service classification control, and time division multiplexing control.

8. The multi-channel access structure based human-in-the-loop flexible ad hoc network system of claim 7, wherein, The frequency division multiple network control is used to divide all network users into multiple clusters according to the task grouping or geographical coverage principle. Each user grouping of the cluster shares a wireless channel. The resource allocation is performed by using the pre-planning or dynamic allocation method in the cluster to realize the single wireless channel shared by small-scale users. The periodic update control is used to divide the wireless channel into a time frame structure for periodic update, and is used to meet the service refresh rate requirement of the periodic service of the measurement and control and network control. The service classification control is used to divide each time frame into three time periods of network-wide broadcast, multi-user polling, and multi-user competition. The network-wide broadcast time period is used for the service distribution of the manned node or the cluster head node. The multi-user polling time period uses the TDMA method to access the channel, and supports the telemetry information back transmission. The multi-user competition time period uses the competition method to access the shared channel, and supports the image and video service back transmission. The time division multiplexing control divides the resource of the multi-user polling time period into several time slots. Each user of the sub-network occupies one time slot to realize the fair scheduling for the users.

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