CN117812667A - Multimode networking system and method based on TDMA - Google Patents
Multimode networking system and method based on TDMA Download PDFInfo
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Abstract
The invention relates to a multimode networking system and method based on TDMA, wherein the system comprises N nodes, and the operation modes comprise three modes: single node mode, hybrid networking mode, and multi-backbone node mode. In an initial state, a star network is built by taking a backbone node as a center, and interaction is realized among terminals through the backbone node; when the multiple backbone nodes all need to build the network and interference is possibly caused due to the close distance, a hybrid networking mode is adopted, and the multiple networks taking the backbone nodes as the center exist in a time-sharing mode in the time domain, so that coexistence of the multiple star networks is ensured, and conflicts among the networks are avoided. When the distance between backbone nodes is far, each star network can work independently. The networking method designed by the invention can flexibly establish networks with different modes when the node moves at will, can avoid interference among a plurality of networks, and can switch modes according to the need.
Description
Technical Field
The invention belongs to the technical field of communication networking, and particularly relates to a multi-mode networking system and method based on TDMA.
Background
Various types of network nodes are included in TDMA-based networking systems. The system has powerful nodes and common terminal nodes. There is both end-to-end traffic interaction and unidirectional traffic transmission between nodes.
Some nodes in the system are stationary and some nodes are movable. The node with the mobile capability is moved to a far place to construct an independent network, and the original network is divided into a plurality of small networks. When the node moves back, the node needs to be aggregated with the original network into one network.
In view of such networking requirements, the competing, scheduling and priority methods proposed in the technical literature are not applicable in terms of network segmentation scenarios and scalability.
Disclosure of Invention
The invention solves the technical problems that: the system and the method can realize the networking based on the TDMA under the scenes of network segmentation or aggregation and the like caused by the movement of part of nodes.
The solution of the invention is as follows: a TDMA-based multimode networking system, the system comprising a total of N nodes, the N nodes operating modes comprising three: a single master node mode, a hybrid networking mode, and a multi-backbone node mode;
in a single master node mode, 1 node in N nodes is a backbone node, N-1 nodes are access terminals, the master node transmits a broadcast signal after being started, and broadcast contents comprise a networking mode, a wireless frame length and node address information; after the access terminal is started, monitoring a broadcast signal of a main node, after receiving the broadcast signal, performing network access interaction with the main node, accessing a star network taking the main node as a center, and communicating through the main node by each access terminal according to a TDMA mode;
in the hybrid networking mode, the system comprises 1 main node and at least 1 auxiliary node, wherein the main node and the auxiliary node are backbone nodes, and the other nodes are access terminals; a part of access terminals and the master node form a first star network, and the other part of access terminals and the slave nodes form a second star network; the time synchronization of the two star networks is realized, a main node and a secondary node send broadcast signals to access terminals in the respective star networks according to a TDMA mode, and the access terminals in the first star network and the second star network communicate through backbone nodes according to the TDMA mode; an access terminal between the first star network and the second star network communicates with the secondary node through the primary node;
in a multi-backbone node mode, the multi-backbone node comprises 1 main node and at least 1 auxiliary node, wherein the main node and the auxiliary node are backbone nodes, and the other nodes are access terminals; a part of access terminals and the master node form a first star network, and the other part of access terminals and the slave nodes form a second star network; the time of the two star networks is independent, the main node and the auxiliary node independently send broadcast signals to the access terminals in the respective star networks, and the access terminals in the first star network and the second star network communicate through the backbone nodes according to a TDMA mode; an access terminal between a first star network and a second star network communicates through a primary node and a secondary node.
Preferably, the time slots of the single master node mode comprise three types of broadcast time slots, control time slots and service time slots; the broadcast time slot is used by a backbone node, the control time slot is a time slot of a control signaling, the control time slot comprises an uplink control time slot and a downlink control time slot, the uplink control time slot is used in a competition mode or a fixed allocation mode after network access, and the downlink control time slot is used by the backbone node as required; the service time slot is used according to the need, when the network access terminal has service requirement, the service time slot is obtained by applying the control time slot to the backbone node, and the service time slot is released when the service is finished, wherein the control signaling comprises network access signaling and service access signaling.
Preferably, the time slots of the hybrid networking mode are divided into a main node time slot and a secondary node time slot, wherein the time slots of the main node time slot and the secondary node time slot comprise three types of broadcast time slots, control time slots and service time slots; the allocation mode of the three types of time slots in the time slot of the main node and the time slot of the auxiliary node is the same as that of the time slot allocation of the single main node mode.
Preferably, in the multi-backbone node networking mode, the time slots of the first star network and the second star network each include three types of broadcast time slots, control time slots and service time slots; the time slot allocation mode of the first star network and the second star network is the same as that of the single master node mode.
Preferably, the single node mode star network construction process is as follows:
the main node transmits a broadcast signal in a broadcast time slot, wherein the broadcast signal comprises a networking mode, a wireless frame length and main node address information; the networking mode is set as a single master node mode;
after each access terminal is started, the broadcast signals of the main node are monitored, and then the access terminal is added into the network of the main node, and becomes a member of a star network taking the main node as a center.
Preferably, the single node mode star network communication procedure is as follows:
when a source access terminal needs to carry out service communication, a service access application is sent to a main node in a control time slot, wherein the service access application comprises a source access terminal address, a target access terminal address and a resource requirement; the resource requirement is the number of the required uplink time slots;
after receiving a service access application of a source access terminal, a main node sends response information in a downlink control time slot, wherein the response information comprises a terminal address and an allocated service time slot number;
when the service time slot allocated by the main node arrives, the source access terminal sends service information to the main node;
after receiving the service data, the master node sends the service data to a target access terminal in an idle service time slot, wherein the service information comprises a target access terminal address and service content;
and the target access terminal receives the service information sent by the main node and acquires own service data.
Preferably, the switching process from the single node mode to the hybrid networking mode is as follows:
after the main node detects that the auxiliary node joins the star network, the main node automatically switches to a hybrid networking mode, and broadcasts a broadcast signal in a broadcast time slot of the main node, and at the moment, the networking mode in the broadcast signal is set to be the hybrid networking mode;
the auxiliary node transmits a broadcast signal in a appointed auxiliary node broadcast time slot; the networking mode in the broadcast signal is a hybrid networking mode, and the address information is the address information of the auxiliary node;
after receiving the broadcast information of the main node and the auxiliary node, each access terminal judges the intensity of the received signal and selects a star network with high intensity of the received signal as a home network;
the access terminal with changed attribution relation sends position updating information on the control time slot of the newly added backbone node, wherein the position updating information comprises a terminal address and the newly added backbone node address;
after the backbone node receives the position updating information, the backbone node sends new attribution information of the terminal to other backbone nodes, and a mapping table of the terminal and the backbone node is maintained.
Preferably, the communication process of 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 firstly applies for a service time slot through a control channel, after obtaining the service time slot, service data with a destination access terminal address is sent to a backbone node of the star network in the service time slot, the backbone node inquires a maintained terminal and backbone node mapping table according to the destination access terminal address in the service data, obtains a backbone node corresponding to the destination access terminal, sends the data packet to the backbone node corresponding to the destination access terminal through the service time slot between the backbone nodes, and after the backbone node corresponding to the destination access terminal receives the data packet, inquires the terminal and the backbone node mapping table, confirms that the destination access terminal belongs to the node and sends the data packet to the destination access terminal in the service time slot.
Preferably, the switching condition and process from the hybrid networking mode to the multi-backbone node mode are as follows:
in the mixed networking mode, the auxiliary nodes can receive broadcasting signals of the other side in the coverage area of the main nodes;
when the distance between the main node and the auxiliary node gradually becomes far, and the main node continuously receives the broadcasting signal of the auxiliary node for T seconds, the auxiliary node is considered to be far away, and the networking mode is indicated as a multi-backbone node mode in the broadcasting signal;
when the main node is abnormal, the auxiliary node continuously receives the broadcast signal of the main node for T seconds, the auxiliary node switches the bit to be in a backbone node mode, and the networking mode is indicated to be in a multi-backbone node mode in the broadcast signal;
after receiving the broadcast signal of the main node or the auxiliary node, the access terminal selects the backbone node which can receive the broadcast signal to join the star network, and reports the position information in the control time slot of the star network.
The other technical scheme of the invention is as follows: a TDMA-based multimode networking method, the method comprising the steps of:
step one, starting a main node, and transmitting a broadcast signal, wherein the broadcast signal comprises a networking mode, a wireless frame length and a node address; in the initial state, the networking mode broadcasted by the master node is a single master node mode;
step two: the access terminal is started, the network of the main node is added after the broadcast signal of the main node is detected, and the access terminal becomes a member of the network of the main node;
step three: the auxiliary node is started, the node is firstly used as a common access terminal to join the network of the main node, the main node automatically switches the system into a hybrid networking mode, the wireless frame length is expanded, and the mode identification and the frame length information are indicated in broadcast information;
step four: the auxiliary node detects the broadcast signal indicating the mixed mode, and transmits the broadcast signal at the indicated moment, and broadcasts the mixed networking mode, the wireless frame length and the auxiliary node address of the network taking the auxiliary node as the center;
step five: the main node and the auxiliary node continuously exchange state information, and when the main node and the auxiliary node continuously do not receive state information of the other side for T seconds, the main node and the auxiliary node switch a network taking the main node as a center into a multi-backbone node mode and indicate the multi-backbone node mode in broadcast information;
step six: when the auxiliary node needs to approach the main node, the auxiliary node firstly closes the broadcast information, continuously monitors the broadcast information of the main node, re-enters the network after receiving the broadcast information, and re-enters the network of the main node by taking the auxiliary node as an access terminal, and the main node switches the network mode into a hybrid networking mode and indicates the network mode in the broadcast information.
Compared with the prior art, the invention has the beneficial effects that:
(1) The invention divides the nodes in the system into a trunk node and a terminal node. A star network is built by taking backbone nodes as centers, and interaction is realized among terminals through the backbone nodes; when the multiple backbone nodes all need to build the network and interference is possibly caused due to the close distance, a hybrid networking mode is adopted, and the multiple networks taking the backbone nodes as the center exist in a time-sharing mode in the time domain, so that coexistence of the multiple star networks is ensured, and conflicts among the networks are avoided. When the distance between backbone nodes is far, each star network can work independently. The networking mode of the system is switched according to the scene as required;
(2) The invention designs a multi-mode networking method based on a TDMA system, and the designed single-master node mode, mixed mode and multi-backbone node mode are suitable for scenes in which nodes move to cause network segmentation or aggregation, can be applied to networking scenes such as sea surfaces, underwater, tactical data chains and the like, and have wide application prospects.
Drawings
FIG. 1 is a schematic diagram of a single master node mode according to an embodiment of the present invention.
FIG. 2 is a schematic diagram of a hybrid mode according to an embodiment of the present invention.
FIG. 3 is a schematic diagram of a multi-backbone node mode according to an embodiment of the present invention.
Fig. 4 is a schematic diagram of a single backbone node network radio frame according to an embodiment of the present invention.
Fig. 5 is a schematic diagram of a mixed mode radio frame (taking one master node and one slave node as an example, two networks are synchronized) according to an embodiment of the present invention.
Fig. 6 is a schematic diagram of a multi-backbone node mode radio frame according to an embodiment of the present invention (taking a primary node network and a secondary node network as an example, two networks do not need to be synchronized).
Detailed Description
The invention is further illustrated below with reference to examples.
As shown in fig. 1, fig. 2, and fig. 3, the system of the multimode networking system based on TDMA of the present invention includes N nodes, and the operation modes of the N nodes include three modes: single master node mode, hybrid networking mode, and multi-backbone node mode.
After the main node is started, the access terminal is connected to the network, after the auxiliary node is started, the system is automatically switched to a hybrid mode, two networks exist in the system in a time-sharing mode, and the network time of the auxiliary node is synchronous on the network of the main node; when the network distance maintained by the main node and the auxiliary node is far enough, the main node and the auxiliary node construct independent networks, a plurality of networks exist independently, and the main node and the auxiliary node can be out of synchronization. Several modes switch as needed.
In a single master node mode, 1 node in N nodes is a backbone node, N-1 nodes are access terminals, the master node transmits a broadcast signal after being started, and broadcast contents comprise a networking mode, a wireless frame length and node address information; after the access terminal is started, monitoring a broadcast signal of a main node, after receiving the broadcast signal, performing network access interaction with the main node, accessing a star network taking the main node as a center, and communicating through the main node by each access terminal according to a TDMA mode;
in the hybrid networking mode, the system comprises 1 main node and at least 1 auxiliary node, wherein the main node and the auxiliary node are backbone nodes, and the other nodes are access terminals; a part of access terminals and the master node form a first star network, and the other part of access terminals and the slave nodes form a second star network; the time synchronization of the two star networks is realized, a main node and a secondary node send broadcast signals to access terminals in the respective star networks according to a TDMA mode, and the access terminals in the first star network and the second star network communicate through backbone nodes according to the TDMA mode; an access terminal between the first star network and the second star network communicates with the secondary node through the primary node;
in a multi-backbone node mode, the multi-backbone node comprises 1 main node and at least 1 auxiliary node, wherein the main node and the auxiliary node are backbone nodes, and the other nodes are access terminals; a part of access terminals and the master node form a first star network, and the other part of access terminals and the slave nodes form a second star network; the time of the two star networks is independent, the main node and the auxiliary node independently send broadcast signals to the access terminals in the respective star networks, and the access terminals in the first star network and the second star network communicate through the backbone nodes according to a TDMA mode; an access terminal between a first star network and a second star network communicates through a primary node and a secondary node.
Preferably, the time slots of the single master node mode comprise three types of broadcast time slots, control time slots and service time slots; the broadcast time slot is used by a backbone node, the control time slot is a time slot of a control signaling, the control time slot comprises an uplink control time slot and a downlink control time slot, the uplink control time slot is used in a competition mode or a fixed allocation mode after network access, and the downlink control time slot is used by the backbone node as required; the service time slot is used according to the need, when the network access terminal has service requirement, the service time slot is obtained by applying the control time slot to the backbone node, and the service time slot is released when the service is finished, wherein the control signaling comprises network access signaling and service access signaling. A single backbone node network radio frame is shown in fig. 4.
The time slots of the hybrid networking mode are divided into a main node time slot and a secondary node time slot, wherein the time slots of the main node time slot and the secondary node time slot comprise three types of broadcasting time slots, control time slots and service time slots; the allocation mode of the three types of time slots in the time slot of the main node and the time slot of the auxiliary node is the same as that of the time slot allocation of the single main node mode. As shown in fig. 5, the mixed mode radio frame is seen from the figure, and the primary node broadcast time slot and the secondary node broadcast time slot are not occupied at the same time in the unified time slot allocation.
In the multi-backbone node networking mode, the time slots of the first star network and the second star network comprise three types of broadcast time slots, control time slots and service time slots; the time slot allocation mode of the first star network and the second star network is the same as that of the single master node mode. A multi-backbone node mode radio frame is shown in fig. 6. As can be seen from the figure, the broadcast time slot of the primary node and the broadcast time slot of the secondary node are independent from each other and can be occupied at the same time.
The single-node mode star network construction process is as follows:
the main node transmits a broadcast signal in a broadcast time slot, wherein the broadcast signal comprises a networking mode, a wireless frame length and main node address information; the networking mode is set as a single master node mode;
after each access terminal is started, the broadcast signals of the main node are monitored, and then the access terminal is added into the network of the main node, and becomes a member of a star network taking the main node as a center.
The single-node mode star network communication process is as follows:
when a source access terminal needs to carry out service communication, a service access application is sent to a main node in a control time slot, wherein the service access application comprises a source access terminal address, a target access terminal address and a resource requirement; the resource requirement is the number of the required uplink time slots;
after receiving a service access application of a source access terminal, a main node sends response information in a downlink control time slot, wherein the response information comprises a terminal address and an allocated service time slot number;
when the service time slot allocated by the main node arrives, the source access terminal sends service information to the main node;
after receiving the service data, the master node sends the service data to a target access terminal in an idle service time slot, wherein the service information comprises a target access terminal address and service content;
and the target access terminal receives the service information sent by the main node and acquires own service data.
The switching process from the single node mode to the hybrid networking mode is as follows:
after the main node detects that the auxiliary node joins the star network, the main node automatically switches to a hybrid networking mode, and broadcasts a broadcast signal in a broadcast time slot of the main node, and at the moment, the networking mode in the broadcast signal is set to be the hybrid networking mode;
the auxiliary node transmits a broadcast signal in a appointed auxiliary node broadcast time slot; the networking mode in the broadcast signal is a hybrid networking mode, and the address information is the address information of the auxiliary node;
after receiving the broadcast information of the main node and the auxiliary node, each access terminal judges the intensity of the received signal and selects a star network with high intensity of the received signal as a home network;
the access terminal with changed attribution relation sends position updating information on the control time slot of the newly added backbone node, wherein the position updating information comprises a terminal address and the newly added backbone node address;
after the backbone node receives the position updating information, the backbone node sends new attribution information of the terminal to other backbone nodes, and a mapping table of the terminal and the backbone node is maintained.
Table 1 mapping table of terminals and backbone nodes
The communication process of 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 firstly applies for a service time slot through a control channel, after obtaining the service time slot, service data with a destination access terminal address is sent to a backbone node of the star network in the service time slot, the backbone node inquires a maintained terminal and backbone node mapping table according to the destination access terminal address in the service data, obtains a backbone node corresponding to the destination access terminal, sends the data packet to the backbone node corresponding to the destination access terminal through the service time slot between the backbone nodes, and after the backbone node corresponding to the destination access terminal receives the data packet, inquires the terminal and the backbone node mapping table, confirms that the destination access terminal belongs to the node and sends the data packet to the destination access terminal in the service time slot.
The switching condition and process from the hybrid networking mode to the multi-backbone node mode are as follows:
in the mixed networking mode, the auxiliary nodes can receive broadcasting signals of the other side in the coverage area of the main nodes;
when the distance between the main node and the auxiliary node gradually becomes far, and the main node continuously receives the broadcasting signal of the auxiliary node for T seconds, the auxiliary node is considered to be far away, and the networking mode is indicated as a multi-backbone node mode in the broadcasting signal;
when the main node is abnormal, the auxiliary node continuously receives the broadcast signal of the main node for T seconds, the auxiliary node switches the bit to be in a backbone node mode, and the networking mode is indicated to be in a multi-backbone node mode in the broadcast signal;
after receiving the broadcast signal of the main node or the auxiliary node, the access terminal selects the backbone node which can receive the broadcast signal to join the star network, and reports the position information in the control time slot of the star network.
Nodes in the system fall into two categories: a backbone node and an access terminal, wherein the backbone node comprises a primary node and a secondary node.
The access terminals do not have the capability of direct communication, and the services of the access terminals all need to be forwarded through the backbone nodes. The auxiliary node is multiple identity, when the auxiliary node does not independently form network, it is an access terminal in the system, when the auxiliary node needs to independently form network, the auxiliary node is a backbone node, and has terminal access capability.
The access terminal decides a network accessing the main node or the auxiliary node according to the position relation or the signal strength relation between the access terminal and the backbone node.
When the service access requirement exists, an access application is sent through a control channel, a service channel is obtained, only terminal nodes in the star network can interact in a multi-backbone node mode, and service time slots can not be carried out among terminals crossing the network.
The invention also provides a multimode networking method based on TDMA, which comprises the following steps: step one, starting a main node, and transmitting a broadcast signal, wherein the broadcast signal comprises a networking mode, a wireless frame length and a node address; in the initial state, the networking mode broadcasted by the master node is a single master node mode;
step two: the access terminal is started, the network of the main node is added after the broadcast signal of the main node is detected, and the access terminal becomes a member of the network of the main node;
step three: the auxiliary node is started, the node is firstly used as a common access terminal to join the network of the main node, the main node automatically switches the system into a hybrid networking mode, the wireless frame length is expanded, and the mode identification and the frame length information are indicated in broadcast information;
step four: the auxiliary node detects the broadcast signal indicating the mixed mode, and transmits the broadcast signal at the indicated moment, and broadcasts the mixed networking mode, the wireless frame length and the auxiliary node address of the network taking the auxiliary node as the center;
step five: the main node and the auxiliary node continuously exchange state information, and when the main node and the auxiliary node continuously do not receive state information of the other side for T seconds, the main node and the auxiliary node switch a network taking the main node as a center into a multi-backbone node mode and indicate the multi-backbone node mode in broadcast information;
step six: when the auxiliary node needs to approach the main node, the auxiliary node firstly closes the broadcast information, continuously monitors the broadcast information of the main node, re-enters the network after receiving the broadcast information, and re-enters the network of the main node by taking the auxiliary node as an access terminal, and the main node switches the network mode into a hybrid networking mode and indicates the network mode in the broadcast information.
Although the present invention has been described in terms of the preferred embodiments, it is not intended to be limited to the embodiments, and any person skilled in the art can make any possible variations and modifications to the technical solution of the present invention by using the methods and technical matters disclosed above without departing from the spirit and scope of the present invention, so any simple modifications, equivalent variations and modifications to the embodiments described above according to the technical matters of the present invention are within the scope of the technical matters of the present invention.
Claims (10)
1. A TDMA-based multimode networking system, comprising a total of N nodes, the N nodes operating modes comprising three: a single master node mode, a hybrid networking mode, and a multi-backbone node mode;
in a single master node mode, 1 node in N nodes is a backbone node, N-1 nodes are access terminals, the master node transmits a broadcast signal after being started, and broadcast contents comprise a networking mode, a wireless frame length and node address information; after the access terminal is started, monitoring a broadcast signal of a main node, after receiving the broadcast signal, performing network access interaction with the main node, accessing a star network taking the main node as a center, and communicating through the main node by each access terminal according to a TDMA mode;
in the hybrid networking mode, the system comprises 1 main node and at least 1 auxiliary node, wherein the main node and the auxiliary node are backbone nodes, and the other nodes are access terminals; a part of access terminals and the master node form a first star network, and the other part of access terminals and the slave nodes form a second star network; the time synchronization of the two star networks is realized, a main node and a secondary node send broadcast signals to access terminals in the respective star networks according to a TDMA mode, and the access terminals in the first star network and the second star network communicate through backbone nodes according to the TDMA mode; an access terminal between the first star network and the second star network communicates with the secondary node through the primary node;
in a multi-backbone node mode, the multi-backbone node comprises 1 main node and at least 1 auxiliary node, wherein the main node and the auxiliary node are backbone nodes, and the other nodes are access terminals; a part of access terminals and the master node form a first star network, and the other part of access terminals and the slave nodes form a second star network; the time of the two star networks is independent, the main node and the auxiliary node independently send broadcast signals to the access terminals in the respective star networks, and the access terminals in the first star network and the second star network communicate through the backbone nodes according to a TDMA mode; an access terminal between a first star network and a second star network communicates through a primary node and a secondary node.
2. A TDMA-based multimode networking system according to claim 1 wherein said single master mode time slots comprise three categories, broadcast time slots, control time slots and traffic time slots; the broadcast time slot is used by a backbone node, the control time slot is a time slot of a control signaling, the control time slot comprises an uplink control time slot and a downlink control time slot, the uplink control time slot is used in a competition mode or a fixed allocation mode after network access, and the downlink control time slot is used by the backbone node as required; the service time slot is used according to the need, when the network access terminal has service requirement, the service time slot is obtained by applying the control time slot to the backbone node, and the service time slot is released when the service is finished, wherein the control signaling comprises network access signaling and service access signaling.
3. The TDMA-based multimode networking system of claim 1 wherein the time slots of the hybrid networking mode are divided into a primary node time period and a secondary node time period, the time slots of the primary node time period and the secondary node time period each comprising three categories of broadcast time slots, control time slots and traffic time slots; the allocation mode of the three types of time slots in the time slot of the main node and the time slot of the auxiliary node is the same as that of the time slot allocation of the single main node mode.
4. A TDMA-based multimode networking system according to claim 1 wherein said multi-backbone node networking mode wherein the time slots of the first and second star networks each comprise three categories, broadcast time slots, control time slots and traffic time slots; the time slot allocation mode of the first star network and the second star network is the same as that of the single master node mode.
5. A TDMA-based multimode networking system according to claim 1 wherein said single-node mode star network is constructed as follows:
the main node transmits a broadcast signal in a broadcast time slot, wherein the broadcast signal comprises a networking mode, a wireless frame length and main node address information; the networking mode is set as a single master node mode;
after each access terminal is started, the broadcast signals of the main node are monitored, and then the access terminal is added into the network of the main node, and becomes a member of a star network taking the main node as a center.
6. A TDMA-based multimode networking system according to claim 1 wherein single-node mode star network communication is as follows:
when a source access terminal needs to carry out service communication, a service access application is sent to a main node in a control time slot, wherein the service access application comprises a source access terminal address, a target access terminal address and a resource requirement; the resource requirement is the number of the required uplink time slots;
after receiving a service access application of a source access terminal, a main node sends response information in a downlink control time slot, wherein the response information comprises a terminal address and an allocated service time slot number;
when the service time slot allocated by the main node arrives, the source access terminal sends service information to the main node;
after receiving the service data, the master node sends the service data to a target access terminal in an idle service time slot, wherein the service information comprises a target access terminal address and service content;
and the target access terminal receives the service information sent by the main node and acquires own service data.
7. A TDMA-based multimode networking system according to claim 1 wherein the single-node mode to hybrid networking mode switching procedure is:
after the main node detects that the auxiliary node joins the star network, the main node automatically switches to a hybrid networking mode, and broadcasts a broadcast signal in a broadcast time slot of the main node, and at the moment, the networking mode in the broadcast signal is set to be the hybrid networking mode;
the auxiliary node transmits a broadcast signal in a appointed auxiliary node broadcast time slot; the networking mode in the broadcast signal is a hybrid networking mode, and the address information is the address information of the auxiliary node;
after receiving the broadcast information of the main node and the auxiliary node, each access terminal judges the intensity of the received signal and selects a star network with high intensity of the received signal as a home network;
the access terminal with changed attribution relation sends position updating information on the control time slot of the newly added backbone node, wherein the position updating information comprises a terminal address and the newly added backbone node address;
after the backbone node receives the position updating information, the backbone node sends new attribution information of the terminal to other backbone nodes, and a mapping table of the terminal and the backbone node is maintained.
8. A TDMA-based multimode networking system according to claim 1 wherein the communication procedure for two access terminals belonging to different star networks in 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 firstly applies for a service time slot through a control channel, after obtaining the service time slot, service data with a destination access terminal address is sent to a backbone node of the star network in the service time slot, the backbone node inquires a maintained terminal and backbone node mapping table according to the destination access terminal address in the service data, obtains a backbone node corresponding to the destination access terminal, sends the data packet to the backbone node corresponding to the destination access terminal through the service time slot between the backbone nodes, and after the backbone node corresponding to the destination access terminal receives the data packet, inquires the terminal and the backbone node mapping table, confirms that the destination access terminal belongs to the node and sends the data packet to the destination access terminal in the service time slot.
9. A TDMA-based multimode networking system according to claim 1 wherein the conditions and procedures for switching from hybrid networking mode to multi-backbone mode are:
in the mixed networking mode, the auxiliary nodes can receive broadcasting signals of the other side in the coverage area of the main nodes;
when the distance between the main node and the auxiliary node gradually becomes far, and the main node continuously receives the broadcasting signal of the auxiliary node for T seconds, the auxiliary node is considered to be far away, and the networking mode is indicated as a multi-backbone node mode in the broadcasting signal;
when the main node is abnormal, the auxiliary node continuously receives the broadcast signal of the main node for T seconds, the auxiliary node switches the bit to be in a backbone node mode, and the networking mode is indicated to be in a multi-backbone node mode in the broadcast signal;
after receiving the broadcast signal of the main node or the auxiliary node, the access terminal selects the backbone node which can receive the broadcast signal to join the star network, and reports the position information in the control time slot of the star network.
10. A TDMA-based multimode networking method according to claim 1 wherein:
step one, starting a main node, and transmitting a broadcast signal, wherein the broadcast signal comprises a networking mode, a wireless frame length and a node address; in the initial state, the networking mode broadcasted by the master node is a single master node mode;
step two: the access terminal is started, the network of the main node is added after the broadcast signal of the main node is detected, and the access terminal becomes a member of the network of the main node;
step three: the auxiliary node is started, the node is firstly used as a common access terminal to join the network of the main node, the main node automatically switches the system into a hybrid networking mode, the wireless frame length is expanded, and the mode identification and the frame length information are indicated in broadcast information;
step four: the auxiliary node detects the broadcast signal indicating the mixed mode, and transmits the broadcast signal at the indicated moment, and broadcasts the mixed networking mode, the wireless frame length and the auxiliary node address of the network taking the auxiliary node as the center;
step five: the main node and the auxiliary node continuously exchange state information, and when the main node and the auxiliary node continuously do not receive state information of the other side for T seconds, the main node and the auxiliary node switch a network taking the main node as a center into a multi-backbone node mode and indicate the multi-backbone node mode in broadcast information;
step six: when the auxiliary node needs to approach the main node, the auxiliary node firstly closes the broadcast information, continuously monitors the broadcast information of the main node, re-enters the network after receiving the broadcast information, and re-enters the network of the main node by taking the auxiliary node as an access terminal, and the main node switches the network mode into a hybrid networking mode and indicates the network mode in the broadcast information.
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