A multi-mode networking system and method based on TDMA

Abstract

The application relates to a multi-mode networking system and method based on TDMA, the operation modes of the N nodes of the system include three modes: single node mode, mixed networking mode and multi-backbone node mode. In the initial state, a star network is constructed with the backbone node as the center, and the terminals realize interaction through the backbone node; when multiple backbone nodes all need to build networks and interference may be caused due to the short distance, the mixed networking mode is adopted, multiple networks with the backbone node as the center exist in time domain, the coexistence of multiple star networks is ensured, and the conflict between the networks is avoided. When the distance between the backbone nodes is far, the star networks can independently work. The networking method designed by the application can flexibly build networks of different modes when the nodes are arbitrarily moved, the interference between multiple networks can be avoided, and the modes can be switched according to needs.

Description

Technical Field

[0001] This invention belongs to the field of communication networking technology. Specifically, it designs a multi-mode networking system and method based on TDMA. Background Technology

[0002] TDMA-based networking systems include various types of network nodes. These include both powerful nodes and ordinary terminal nodes. Inter-node communication involves both end-to-end service interaction and unidirectional service transmission.

[0003] Some nodes in the system are stationary, while others are mobile. Mobile nodes move to distant locations and form independent networks, dividing the original network into smaller ones. When a node moves back, it needs to rejoin the original network to form a new one.

[0004] For such networking requirements, the competition, scheduling, and priority methods proposed in technical literature are not applicable in terms of network segmentation scenarios and scalability. Summary of the Invention

[0005] The technical problem solved by this invention is to overcome the shortcomings of the prior art and propose a TDMA-based multi-mode networking system and method, which can realize TDMA-based networking in scenarios such as network segmentation or aggregation caused by the movement of some nodes.

[0006] The solution of the present invention is: a multi-mode networking system based on TDMA, which includes N nodes, and the operating modes of the N nodes include three types: single master node mode, hybrid networking mode and multi-backbone node mode.

[0007] In single master node mode, one of the N nodes is the backbone node, and the other N-1 nodes are access terminals. After the master node powers on, it sends a broadcast signal, which includes the network mode, wireless frame length, and the node's address information. After the access terminal powers on, it listens for the master node's broadcast signal. Upon receiving the broadcast signal, it interacts with the master node to access the star network centered on the master node. Each access terminal communicates through the master node in TDMA mode.

[0008] In the hybrid networking mode, there is one master node and at least one slave node, both of which are backbone nodes, and the remaining nodes are access terminals. Some access terminals form a first star network with the master node, and other access terminals form a second star network with the slave node. The two star networks are time-synchronized. The master node and slave node send broadcast signals to the access terminals in their respective star networks according to TDMA mode. Access terminals in the first and second star networks communicate through the backbone node according to TDMA mode. Access terminals between the first and second star networks communicate through the master node and slave node.

[0009] In the multi-backbone node mode, there is one master node and at least one slave node, both of which are backbone nodes, and the remaining nodes are access terminals. A portion of the access terminals form a first star network with the master node, and another portion of the access terminals form a second star network with the slave node. The two star networks are time-independent, and the master node and slave node independently send broadcast signals to the access terminals within their respective star networks. The access terminals within the first and second star networks communicate through the backbone nodes in TDMA mode. The access terminals between the first and second star networks communicate through the master node and the slave node.

[0010] Preferably, the time slots in the single master node mode include three types: broadcast time slots, control time slots, and service time slots. Broadcast time slots are used by the backbone node. Control time slots are time slots for control signaling, including uplink and downlink control time slots. Uplink control time slots are used either through contention or by fixed allocation after network access, while downlink control time slots are used by the backbone node on demand. Service time slots are used on demand; when a terminal has service needs, it requests a service time slot from the backbone node through the control time slot, and releases the service time slot when the service ends. The control signaling includes network access signaling and service access signaling.

[0011] Preferably, the time slots in the hybrid networking mode are divided into master node time slots and slave node time slots. The time slots in both master node time slots and slave node time slots include three types: broadcast time slots, control time slots, and service time slots. The allocation method of the three types of time slots in the master node time slots and slave node time slots is the same as that in the single master node mode.

[0012] Preferably, in the multi-backbone node networking mode, the time slots of both the first star network and the second star network include three types: broadcast time slots, control time slots, and service time slots; the time slot allocation method of the first star network and the second star network is the same as that of the single master node mode.

[0013] Preferably, the construction process of a single-node star network is as follows:

[0014] The master node sends a broadcast signal in the broadcast time slot. The broadcast signal includes the network mode, wireless frame length, and master node address information. The network mode is set to single master node mode.

[0015] After each access terminal is powered on, it listens for the broadcast signal of the master node and joins the master node's network, becoming a member of the star network centered on the master node.

[0016] Preferably, the communication process of a single-node star network is as follows:

[0017] When a source access terminal needs to conduct service communication, it sends a service access request to the master node in the control time slot. The service access request includes the source access terminal address, the target access terminal address, and resource requirements; the resource requirements are the number of uplink time slots required.

[0018] After receiving the service access request from the source access terminal, the master node sends a response information in the downlink control time slot. The response information includes the terminal address and the allocated service time slot number.

[0019] When the service time slot allocated by the master node arrives, the source access terminal sends service information to the master node;

[0020] After receiving the service data, the master node sends the service data to the destination access terminal during an idle service time slot. The service information includes the destination access terminal address and the service content.

[0021] The target access terminal receives business information sent by the master node and obtains its own business data.

[0022] Preferably, the switching process from single-node mode to hybrid networking mode is as follows:

[0023] After the master node detects that the slave node has joined the star network, it automatically switches to hybrid networking mode and broadcasts a broadcast signal in the master node's broadcast time slot. At this time, the networking mode in the broadcast signal is set to hybrid networking mode.

[0024] The secondary node sends a broadcast signal in the agreed-upon secondary node broadcast time slot; the broadcast signal contains a hybrid network mode and secondary node address information.

[0025] After receiving the broadcast information from the master node and slave node, each access terminal judges the received signal strength and selects the star network with the higher received signal strength as its home network.

[0026] When the affiliation of an access terminal changes, the access terminal sends location update information in the control time slot of the newly joined backbone node. The location update information includes the terminal address and the address of the newly joined backbone node.

[0027] After receiving the location update information, the backbone node sends the new home information of the terminal to other backbone nodes and maintains the mapping table between the terminal and the backbone node.

[0028] Preferably, the communication process between two access terminals belonging to different star networks in the hybrid networking mode is as follows:

[0029] When a source access terminal needs to communicate with a terminal in another star network, the source access terminal first requests a service time slot through the control channel. After obtaining the service time slot, it sends service data containing the destination access terminal address to the backbone node of the star network in the service time slot. The backbone node queries the terminal-backbone node mapping table it maintains based on the destination access terminal address in the service data to obtain the backbone node corresponding to the destination access terminal. It then sends the data packet to the backbone node corresponding to the destination access terminal through the service time slot between backbone nodes. After receiving the packet, the backbone node corresponding to the destination access terminal queries the terminal-backbone node mapping table to confirm that the destination access terminal belongs to this node, and then sends the data packet to the destination access terminal in the service time slot.

[0030] Preferably, the switching conditions and process from hybrid networking mode to multi-backbone node mode are as follows:

[0031] In hybrid networking mode, the secondary node is within the coverage area of ​​the primary node, and both the primary and secondary nodes can receive each other's broadcast signals.

[0032] When the distance between the master node and the slave node gradually increases, and the master node does not receive the broadcast signal from the slave node for T consecutive seconds, it is considered that the slave node has moved far away, and the network mode is indicated as multi-backbone node mode in the broadcast signal.

[0033] When the master node is abnormal, if the slave node does not receive the broadcast signal from the master node for T consecutive seconds, the slave node will switch to backbone node mode and indicate the networking mode as multi-backbone node mode in the broadcast signal.

[0034] After receiving the broadcast signal from the master node or slave node, the access terminal selects a backbone node that can receive its broadcast signal to join its star network, and reports its location information in the control time slot of the star network.

[0035] Another technical solution of the present invention is: a multi-mode networking method based on TDMA, the method comprising the following steps:

[0036] Step 1: The master node powers on and sends a broadcast signal, which includes the network mode, wireless frame length, and node address. In the initial state, the network mode broadcast by the master node is the single master node mode.

[0037] Step 2: After the access terminal powers on and receives the broadcast signal from the master node, it joins the master node's network and becomes a member of the master node's network.

[0038] Step 3: The secondary node is powered on. This node first joins the network of the primary node as an ordinary access terminal. The primary node automatically switches the system to hybrid networking mode, extends the wireless frame length, and the mode identifier and frame length information are indicated in the broadcast information.

[0039] Step 4: The secondary node detects the broadcast signal indicating the hybrid mode and sends the broadcast signal at the indicated time, broadcasting the hybrid networking mode of the network centered on it, the wireless frame length, and the address of the secondary node;

[0040] Step 5: The primary and secondary nodes continuously exchange status information. When neither the primary nor the secondary node receives status information from the other for T consecutive seconds, they will switch the network centered on themselves to a multi-backbone node mode and indicate this in the broadcast information.

[0041] Step Six: When the secondary node needs to move closer to the primary node, the secondary node first turns off its broadcast information and continues to listen for the primary node's broadcast information. After receiving the broadcast information, it rejoins the network. The secondary node rejoins the primary node's network as an access terminal. The primary node switches the network mode to hybrid networking mode and indicates this in the broadcast information.

[0042] The advantages of this invention compared to the prior art are:

[0043] (1) This invention divides the nodes in the system into backbone nodes and terminal nodes. A star network is constructed with the backbone nodes as the center, and the terminals interact through the backbone nodes. When multiple backbone nodes need to be networked and interference may occur due to their close proximity, a hybrid networking mode is adopted, in which multiple networks centered on the backbone nodes exist in a time-division multiplexing manner in the time domain, which not only ensures the coexistence of multiple star networks, but also avoids conflicts between networks. When the distance between backbone nodes is far, each star network can work independently. The networking mode of the system can be switched as needed according to the scenario.

[0044] (2) Based on the TDMA system, this invention designs a multi-mode networking method. The designed single master node mode, hybrid mode and multi-backbone node mode are suitable for scenarios where node movement leads to network segmentation or aggregation. It can be applied to networking scenarios such as sea surface, underwater, and tactical data link, and has broad application prospects. Attached Figure Description

[0045] Figure 1 This is a schematic diagram of a single master node mode according to an embodiment of the present invention.

[0046] Figure 2 This is a schematic diagram of the hybrid mode in an embodiment of the present invention.

[0047] Figure 3 This is a schematic diagram of the multi-backbone node mode in an embodiment of the present invention.

[0048] Figure 4 This is a schematic diagram of a single backbone node network wireless frame according to an embodiment of the present invention.

[0049] Figure 5 This is a schematic diagram of a hybrid mode wireless frame in an embodiment of the present invention (taking one master node and one slave node as an example, with two networks synchronized).

[0050] Figure 6 This is a schematic diagram of a wireless frame in a multi-backbone node mode according to an embodiment of the present invention (taking one primary node network and one secondary node network as an example, the two networks do not need to be synchronized). Detailed Implementation

[0051] The present invention will be further described below with reference to the embodiments.

[0052] like Figure 1 , Figure 2 , Figure 3 As shown, the present invention discloses a multi-mode networking system based on TDMA. The system includes N nodes, and the operating modes of the N nodes include three types: single master node mode, hybrid networking mode, and multi-backbone node mode.

[0053] After the primary node powers on and establishes its network, connected terminals join the network. After the secondary node powers on and joins the network, the system automatically switches to hybrid mode. Two networks exist in the system, operating on a time-sharing basis, and the secondary node's network time is synchronized with the primary node's network time. When the networks maintained by the primary and secondary nodes are sufficiently far apart, they construct independent networks, allowing multiple networks to exist independently, and the primary and secondary nodes can be asynchronous. These modes can be switched as needed.

[0054] In single master node mode, one of the N nodes is the backbone node, and the other N-1 nodes are access terminals. After the master node powers on, it sends a broadcast signal, which includes the network mode, wireless frame length, and the node's address information. After the access terminal powers on, it listens for the master node's broadcast signal. Upon receiving the broadcast signal, it interacts with the master node to access the star network centered on the master node. Each access terminal communicates through the master node in TDMA mode.

[0055] In the hybrid networking mode, there is one master node and at least one slave node, both of which are backbone nodes, and the remaining nodes are access terminals. Some access terminals form a first star network with the master node, and other access terminals form a second star network with the slave node. The two star networks are time-synchronized. The master node and slave node send broadcast signals to the access terminals in their respective star networks according to TDMA mode. Access terminals in the first and second star networks communicate through the backbone node according to TDMA mode. Access terminals between the first and second star networks communicate through the master node and slave node.

[0056] In the multi-backbone node mode, there is one master node and at least one slave node, both of which are backbone nodes, and the remaining nodes are access terminals. A portion of the access terminals form a first star network with the master node, and another portion of the access terminals form a second star network with the slave node. The two star networks are time-independent, and the master node and slave node independently send broadcast signals to the access terminals within their respective star networks. The access terminals within the first and second star networks communicate through the backbone nodes in TDMA mode. The access terminals between the first and second star networks communicate through the master node and the slave node.

[0057] Preferably, the time slots in the single master node mode include three types: broadcast time slots, control time slots, and service time slots. Broadcast time slots are used by the backbone node; control time slots are for control signaling and include uplink and downlink control time slots. Uplink control time slots are used either through contention or by fixed allocation after network access; downlink control time slots are used by the backbone node on demand. Service time slots are used on demand; when a terminal has service needs, it requests a service time slot from the backbone node through the control time slot, and releases the service time slot when the service ends. The control signaling includes network access signaling and service access signaling. A single backbone node network radio frame is shown below. Figure 4 As shown.

[0058] The hybrid networking mode divides time slots into master node time slots and slave node time slots. Both master node and slave node time slots include three types of time slots: broadcast time slots, control time slots, and service time slots. The allocation method for these three types of time slots within the master node and slave node time slots is the same as that in the single master node mode. The hybrid mode radio frame is as follows: Figure 5 As shown in the figure, the broadcast time slots of the master node and the broadcast time slots of the slave node are allocated in a unified time slot allocation and are not occupied at the same time.

[0059] In the multi-backbone node networking mode, the time slots of both the first and second star networks include three types: broadcast time slots, control time slots, and service time slots. The time slot allocation method for the first and second star networks is the same as that for the single-master node mode. The wireless frame in the multi-backbone node mode is as follows: Figure 6 As shown in the diagram, the broadcast time slots of the primary node and the broadcast time slots of the secondary node are independent of each other and can be occupied simultaneously.

[0060] The process of constructing a star network in single-node mode is as follows:

[0061] The master node sends a broadcast signal in the broadcast time slot. The broadcast signal includes the network mode, wireless frame length, and master node address information. The network mode is set to single master node mode.

[0062] After each access terminal is powered on, it listens for the broadcast signal of the master node and joins the master node's network, becoming a member of the star network centered on the master node.

[0063] The communication process in a single-node star network is as follows:

[0064] When a source access terminal needs to conduct service communication, it sends a service access request to the master node in the control time slot. The service access request includes the source access terminal address, the target access terminal address, and resource requirements; the resource requirements are the number of uplink time slots required.

[0065] After receiving the service access request from the source access terminal, the master node sends a response information in the downlink control time slot. The response information includes the terminal address and the allocated service time slot number.

[0066] When the service time slot allocated by the master node arrives, the source access terminal sends service information to the master node;

[0067] After receiving the service data, the master node sends the service data to the destination access terminal during an idle service time slot. The service information includes the destination access terminal address and the service content.

[0068] The target access terminal receives business information sent by the master node and obtains its own business data.

[0069] The switching process from single-node mode to hybrid networking mode is as follows:

[0070] After the master node detects that the slave node has joined the star network, it automatically switches to hybrid networking mode and broadcasts a broadcast signal in the master node's broadcast time slot. At this time, the networking mode in the broadcast signal is set to hybrid networking mode.

[0071] The secondary node sends a broadcast signal in the agreed-upon secondary node broadcast time slot; the broadcast signal contains a hybrid network mode and secondary node address information.

[0072] After receiving the broadcast information from the master node and slave node, each access terminal judges the received signal strength and selects the star network with the higher received signal strength as its home network.

[0073] When the affiliation of an access terminal changes, the access terminal sends location update information in the control time slot of the newly joined backbone node. The location update information includes the terminal address and the address of the newly joined backbone node.

[0074] After receiving the location update information, the backbone node sends the new home information of the terminal to other backbone nodes and maintains the mapping table between the terminal and the backbone node.

[0075] Table 1. Mapping Table Between Terminals and Backbone Nodes

[0076]

[0077]

[0078] The communication process between two access terminals belonging to different star networks in the hybrid networking mode is as follows:

[0079] When a source access terminal needs to communicate with a terminal in another star network, the source access terminal first requests a service time slot through the control channel. After obtaining the service time slot, it sends service data containing the destination access terminal address to the backbone node of the star network in the service time slot. The backbone node queries the terminal-backbone node mapping table it maintains based on the destination access terminal address in the service data to obtain the backbone node corresponding to the destination access terminal. It then sends the data packet to the backbone node corresponding to the destination access terminal through the service time slot between backbone nodes. After receiving the packet, the backbone node corresponding to the destination access terminal queries the terminal-backbone node mapping table to confirm that the destination access terminal belongs to this node, and then sends the data packet to the destination access terminal in the service time slot.

[0080] The switching conditions and process from hybrid networking mode to multi-backbone node mode are as follows:

[0081] In hybrid networking mode, the secondary node is within the coverage area of ​​the primary node, and both the primary and secondary nodes can receive each other's broadcast signals.

[0082] When the distance between the master node and the slave node gradually increases, and the master node does not receive the broadcast signal from the slave node for T consecutive seconds, it is considered that the slave node has moved far away, and the network mode is indicated as multi-backbone node mode in the broadcast signal.

[0083] When the master node is abnormal, if the slave node does not receive the broadcast signal from the master node for T consecutive seconds, the slave node will switch to backbone node mode and indicate the networking mode as multi-backbone node mode in the broadcast signal.

[0084] After receiving the broadcast signal from the master node or slave node, the access terminal selects a backbone node that can receive its broadcast signal to join its star network, and reports its location information in the control time slot of the star network.

[0085] The nodes in the system are divided into two categories: backbone nodes and access terminals. Backbone nodes include master nodes and slave nodes.

[0086] Access terminals do not have the ability to communicate directly; all services from access terminals must be forwarded through backbone nodes. Secondary nodes have multiple roles: when a secondary node is not operating independently, it is an access terminal within the system; when it needs to operate independently, the secondary node is a backbone node with terminal access capabilities.

[0087] Access terminals decide whether to access the network of the primary or secondary node based on their location or signal strength relationship with the backbone node.

[0088] When there is a need for service access, an access request is sent through the control channel to obtain the service channel. In the multi-backbone node mode, only terminal nodes within the star network can interact, and terminal nodes across networks cannot exchange service time slots.

[0089] The present invention also provides a multi-mode networking method based on TDMA, the method comprising the following steps: Step 1: The master node powers on and sends a broadcast signal, the broadcast signal including the networking mode, radio frame length, and node address; in the initial state, the networking mode broadcast by the master node is single master node mode;

[0090] Step 2: After the access terminal powers on and receives the broadcast signal from the master node, it joins the master node's network and becomes a member of the master node's network.

[0091] Step 3: The secondary node is powered on. This node first joins the network of the primary node as an ordinary access terminal. The primary node automatically switches the system to hybrid networking mode, extends the wireless frame length, and the mode identifier and frame length information are indicated in the broadcast information.

[0092] Step 4: The secondary node detects the broadcast signal indicating the hybrid mode and sends the broadcast signal at the indicated time, broadcasting the hybrid networking mode of the network centered on it, the wireless frame length, and the address of the secondary node;

[0093] Step 5: The primary and secondary nodes continuously exchange status information. When neither the primary nor the secondary node receives status information from the other for T consecutive seconds, they will switch the network centered on themselves to a multi-backbone node mode and indicate this in the broadcast information.

[0094] Step Six: When the secondary node needs to move closer to the primary node, the secondary node first turns off its broadcast information and continues to listen for the primary node's broadcast information. After receiving the broadcast information, it rejoins the network. The secondary node rejoins the primary node's network as an access terminal. The primary node switches the network mode to hybrid networking mode and indicates this in the broadcast information.

[0095] Although the present invention has been disclosed above with reference to preferred embodiments, it is not intended to limit the present invention. Any person skilled in the art can make possible changes and modifications to the technical solutions of the present invention by utilizing the methods and techniques disclosed above without departing from the spirit and scope of the present invention. Therefore, any simple modifications, equivalent changes and alterations made to the above embodiments based on the technical essence of the present invention without departing from the content of the technical solutions of the present invention shall fall within the protection scope of the technical solutions of the present invention.

Claims

1. A multi-mode networking system based on TDMA, characterized in that... It consists of N nodes, and the N nodes operate in three modes: single master node mode, hybrid networking mode, and multi-backbone node mode. In single master node mode, one of the N nodes is the backbone node, and the other N-1 nodes are access terminals. After the master node powers on, it sends a broadcast signal, which includes the network mode, wireless frame length, and the node's address information. After the access terminal powers on, it listens for the master node's broadcast signal. Upon receiving the broadcast signal, it interacts with the master node to access the star network centered on the master node. Each access terminal communicates through the master node in TDMA mode. In the hybrid networking mode, there is one master node and at least one slave node, both of which are backbone nodes, and the remaining nodes are access terminals. Some access terminals form a first star network with the master node, and other access terminals form a second star network with the slave node. The two star networks are time-synchronized. The master node and slave node send broadcast signals to the access terminals in their respective star networks according to TDMA mode. Access terminals in the first and second star networks communicate through the backbone node according to TDMA mode. Access terminals between the first and second star networks communicate through the master node and slave node. In the multi-backbone node mode, there is one master node and at least one slave node, both of which are backbone nodes, and the remaining nodes are access terminals. A portion of the access terminals form a first star network with the master node, and another portion of the access terminals form a second star network with the slave node. The two star networks are time-independent, and the master node and slave node independently send broadcast signals to the access terminals within their respective star networks. Access terminals within the first and second star networks communicate through the backbone nodes in TDMA mode. Access terminals between the first and second star networks communicate through the master node and slave node. The networking method for the above-mentioned TDMA-based multi-mode system is as follows: Step 1: The master node powers on and sends a broadcast signal, which includes the network mode, wireless frame length, and node address. In the initial state, the network mode broadcast by the master node is single master node mode. Step 2: After the access terminal powers on and receives the broadcast signal from the master node, it joins the master node's network and becomes a member of the master node's network. Step 3: The secondary node is powered on. This node first joins the network of the primary node as an ordinary access terminal. The primary node automatically switches the system to hybrid networking mode, extends the wireless frame length, and the mode identifier and frame length information are indicated in the broadcast information. Step 4: The secondary node detects the broadcast signal indicating the hybrid mode and sends the broadcast signal at the indicated time, broadcasting the hybrid networking mode of the network centered on it, the wireless frame length, and the address of the secondary node; Step 5: The primary and secondary nodes continuously exchange status information. When neither the primary nor the secondary node receives status information from the other for T consecutive seconds, they will switch the network centered on themselves to a multi-backbone node mode and indicate this in the broadcast information. Step Six: When the secondary node needs to move closer to the primary node, the secondary node first turns off its broadcast information and continues to listen for the primary node's broadcast information. After receiving the broadcast information, it rejoins the network. The secondary node rejoins the primary node's network as an access terminal. The primary node switches the network mode to hybrid networking mode and indicates this in the broadcast information.

2. The TDMA-based multi-mode networking system according to claim 1, characterized in that... The single master node mode includes three types of time slots: broadcast time slots, control time slots, and service time slots. Broadcast time slots are used by the backbone node. Control time slots are time slots for control signaling, including uplink control time slots and downlink control time slots. Uplink control time slots are used either through contention or by fixed allocation after network access, while downlink control time slots are used by the backbone node on demand. Service time slots are used on demand. When a terminal has a service requirement, it requests a service time slot from the backbone node through the control time slot. The service time slot is released when the service ends. The control signaling includes network access signaling and service access signaling.

3. A multi-mode networking system based on TDMA according to claim 1, characterized in that... The time slots in the hybrid networking mode are divided into master node time slots and slave node time slots. The time slots in both master node time slots and slave node time slots include three types: broadcast time slots, control time slots, and service time slots. The allocation method of the three types of time slots in the master node time slots and slave node time slots is the same as that in the single master node mode.

4. A multi-mode networking system based on TDMA according to claim 1, characterized in that... In the multi-backbone node networking mode, the time slots of both the first star network and the second star network include three types: broadcast time slots, control time slots, and service time slots; the time slot allocation method of the first star network and the second star network is the same as that of the single master node mode.

5. A multi-mode networking system based on TDMA according to claim 1, characterized in that... The process of constructing a star network in single-node mode is as follows: The master node sends a broadcast signal in the broadcast time slot. The broadcast signal includes the network mode, wireless frame length, and master node address information. The network mode is set to single master node mode. After each access terminal is powered on, it listens for the broadcast signal of the master node and joins the master node's network, becoming a member of the star network centered on the master node.

6. A multi-mode networking system based on TDMA according to claim 1, characterized in that... The communication process in a single-node star network is as follows: When a source access terminal needs to perform service communication, it sends a service access request to the master node in the control time slot. The service access request includes the source access terminal address, the target access terminal address, and resource requirements. The resource requirement is the number of uplink time slots needed; After receiving the service access request from the source access terminal, the master node sends a response information in the downlink control time slot. The response information includes the terminal address and the allocated service time slot number. When the service time slot allocated by the master node arrives, the source access terminal sends service information to the master node; After receiving the service data, the master node sends the service data to the destination access terminal during an idle service time slot. The service information includes the destination access terminal address and the service content. The target access terminal receives business information sent by the master node and obtains its own business data.

7. A multi-mode networking system based on TDMA according to claim 1, characterized in that... The switching process from single-node mode to hybrid networking mode is as follows: After the master node detects that the slave node has joined the star network, it automatically switches to hybrid networking mode and broadcasts a broadcast signal in the master node's broadcast time slot. At this time, the networking mode in the broadcast signal is set to hybrid networking mode. The secondary node sends a broadcast signal in the agreed-upon secondary node broadcast time slot; the broadcast signal contains a hybrid network mode and secondary node address information. After receiving the broadcast information from the master node and slave node, each access terminal judges the received signal strength and selects the star network with the higher received signal strength as its home network. When the affiliation of an access terminal changes, the access terminal sends location update information in the control time slot of the newly joined backbone node. The location update information includes the terminal address and the address of the newly joined backbone node. After receiving the location update information, the backbone node sends the new home information of the terminal to other backbone nodes and maintains the mapping table between the terminal and the backbone node.

8. A multi-mode networking system based on TDMA according to claim 1, characterized in that... The communication process between two access terminals belonging to different star networks in the hybrid networking mode is as follows: When a source access terminal needs to communicate with a terminal in another star network, the source access terminal first requests a service time slot through the control channel. After obtaining the service time slot, it sends service data containing the destination access terminal address to the backbone node of the star network in the service time slot. The backbone node queries the terminal-backbone node mapping table it maintains based on the destination access terminal address in the service data to obtain the backbone node corresponding to the destination access terminal. It then sends the service data to the backbone node corresponding to the destination access terminal through the service time slot between backbone nodes. After receiving the data, the backbone node corresponding to the destination access terminal queries the terminal-backbone node mapping table to confirm that the destination access terminal belongs to this node, and then sends the service data to the destination access terminal in the service time slot.

9. A multi-mode networking system based on TDMA according to claim 1, characterized in that... The switching conditions and process from hybrid networking mode to multi-backbone node mode are as follows: In hybrid networking mode, the secondary node is within the coverage area of ​​the primary node, and both the primary and secondary nodes can receive each other's broadcast signals. When the distance between the master node and the slave node gradually increases, and the master node does not receive the broadcast signal from the slave node for T consecutive seconds, it is considered that the slave node has moved far away, and the network mode is indicated as multi-backbone node mode in the broadcast signal. When the master node is abnormal, if the slave node does not receive the broadcast signal from the master node for T consecutive seconds, the slave node will switch to backbone node mode and indicate the networking mode as multi-backbone node mode in the broadcast signal. After receiving the broadcast signal from the master node or slave node, the access terminal selects a backbone node that can receive its broadcast signal to join its star network, and reports its location information in the control time slot of the star network.

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