Time slot access method of TDMA (Time Division Multiple Access) system

Abstract

The invention discloses a time slot access method of a TDMA (Time Division Multiple Access) system, which relates to the field of communication and comprises the following steps: S1, a resource application time slot, an access time slot, an idle time slot and a service time slot are defined in a time slot resource list, and the resource application time slot is used for node equipment to apply for resources through the time slot; s2, through a resource application time slot, a decision node in the networking distributes a time slot length and a position required by the application node for the application node; s3, the decision node allocates a corresponding access time slot according to the time slot length applied by the application node; s4, the corresponding access application equipment occupies the service time slots with the same position and length, and node access is completed; and S5, when the equipment is powered off and resource use is completed, the access time slot and service time slot resources are quickly released. According to the technical scheme provided by the invention, the time slot allocation process can be optimized, and resources can be effectively utilized, so that the problems of troublesome process and low resource utilization rate caused by fixed time slots are solved.

Description

Technical Field

[0001] The invention belongs to the field of communications, and in particular relates to a time slot access method for a TDMA system. Background Art

[0002] The TDMA system can divide time into periodic frames, and each frame is further divided into several time slots, that is, time slots, in which the frames or time slots do not overlap in the time dimension. The first problem faced in the TDMA system is the time slot allocation problem. The first two concepts that need to be clarified are the time slot planning stage and the network access stage. The time slot planning stage is in the theoretical design period, and the main work is to plan the time slots owned by each device and the time period of the overall system operation in advance. The networking access stage is in the device working period, and the device will work periodically according to the time slots designed in the time slot planning stage. Generally speaking, in the time slot planning stage, the time slots owned by each device should be completely consistent with the time slots owned by each device in the networking access stage.

[0003] In order to access more devices during the networking access phase, the time slots of the entire frame period are planned to be very full during the time slot planning phase. Generally speaking, the networking devices of the TDMA system have a number when they are working, and this number will be used to allocate time slots during the time slot planning phase, that is, this number is bound to this time slot. When the number corresponding to a networking device is planned with a corresponding time slot, then this time slot is the dedicated time slot of this device. Regardless of whether this device exists, other devices will not occupy this time slot because it is not known when this device will exist.

[0004] Since the device number is bound to the position of the time slot planning, the device numbering needs to be continuous or have a certain pattern. In the actual product production and business process, for example: when the customer purchases the devices numbered 1, 2, and 3 for the first time, and then there is a period of time in between, the customer usually wants to purchase the devices numbered 4, 5... for the second purchase, and purchases in this regular order. Therefore, before the equipment is shipped, it is necessary to retrieve historical records, renumber and set processes, etc. This method is more troublesome and cannot be used as needed. Moreover, since the time slots in the time slot planning stage and the network access stage are completely consistent, and the time slots occupied by each device are dedicated time slots, although the number of self-organizing network devices actually connected in the application is small, they cannot occupy the time slots allocated to the unconnected devices, resulting in low overall time slot utilization and few resources occupied by a single device. Therefore, in order to overcome the above-mentioned defects, a time slot access method that can optimize the process and effectively utilize resources is needed. The present invention solves this technical problem. Summary of the invention

[0005] The purpose of the present application is to provide a time slot access method for a TDMA system, aiming to solve the problems of complex time slot allocation process and low time slot resource utilization.

[0006] To achieve the above object, the present application proposes a time slot access method for a TDMA system, the time slot access method for a TDMA system comprising the following steps:

[0007] S1. Each device in the entire network shares the same time slot resource list, in which resource application time slots, access time slots, idle time slots and service time slots are defined. The resource application time slots are used by node devices to apply for resources through these time slots.

[0008] S2. Apply for a time slot through the resource, and let the decision node within the network allocate the required time slot length and position to the applying node;

[0009] S3, the decision node allocates the corresponding access time slot according to the time slot length requested by the application node;

[0010] S4, the corresponding access application device occupies the idle time slot of the same position and length to complete the node access;

[0011] S5. When the device is powered off and the resources are used up, the access time slot resources will be quickly released.

[0012] Furthermore, the step S2 includes the following contents:

[0013] S21, the device is powered on and monitors other nodes;

[0014] S22, judging the existence of a decision node according to the data intercepted in the monitoring phase;

[0015] S23. Apply for resources from the decision node in the resource application time slot.

[0016] Furthermore, the step S23 includes the following contents:

[0017] S231. In a frame period, each device that needs to apply for resources randomly occupies a resource application time slot;

[0018] S232, after the device, i.e., the application node, occupies the resource application time slot, it sends a resource application signaling packet to the decision node;

[0019] S233. Devices that have not occupied the resource application time slot, and devices whose applications have not been authorized by the decision node, will continue to apply through the random cycle of the resource application time slot until they apply for the time slot resources.

[0020] Furthermore, the step S232 includes the following contents:

[0021] S2321, equipment and terminal connection;

[0022] S2322, after the device receives the data from the terminal and obtains the network port receiving flow value, it will calculate a communication gear according to the communication quality between itself and the decision node. This gear indicates the flow size that can be sent by a single basic unit time slot length, that is, the air interface sending flow size;

[0023] S2323. Calculate the time slot resource length required by the device;

[0024] S2324. The device sends a resource request signaling packet including the "required time slot resource length" to the decision node.

[0025] Furthermore, the step S3 includes the following contents:

[0026] S31, after receiving the resource request signaling packet, the decision node will calculate according to the current idle time slot resource length of the entire network;

[0027] S32, the decision node knows the starting position and length of the remaining idle time slots in the frame period, and subtracts the time slot resource length required by the device from the idle time slot length. If it is a positive number or 0, it is satisfied, and if it is a negative number, it is not satisfied;

[0028] S33. When resources are sufficient, the decision node will apply for node authorization.

[0029] Furthermore, the step S33 includes the following contents:

[0030] S331. When resources are sufficient, the decision node sends the starting position and length of the access time slot back to the application node via the air interface;

[0031] S332, after receiving the information, the applying node can send and receive related services at this location, that is, resource occupation, and the corresponding time slot resource list shared by the whole network will also be synchronously updated to indicate the occupation of this time slot resource by this applying node;

[0032] S333. When the applying node no longer performs business at this location, the time slot resource length required by the device changes to 0, and the corresponding time slot resource list also marks that this time slot position is idle, that is, it changes from an access time slot to an idle time slot.

[0033] Furthermore, the step S21 includes the following contents:

[0034] S211, the device is powered on and monitors whether there are other nodes that have been networked or not networked;

[0035] S212. If no signal from other devices is detected, the device will try to send a detection signal to notify other possible nodes.

[0036] S213. After attempting to transmit, the device will periodically stop transmitting and clear its own transmission time slot to re-monitor the signal;

[0037] S214, after clearing the transmission time slot, the device continues to monitor for a period of time to listen to the activities of other devices;

[0038] S215: If the device detects transmission from other devices during monitoring, indicating that other nodes exist, the device can apply for time slot resources.

[0039] Furthermore, the decision node in step S22 is the only designated node in the entire network, and the device applies for time slot resources through this node.

[0040] Furthermore, in step S232, after the resource request signaling packet is transmitted, the device immediately releases the time slot resource, and after the release, the device enters the receiving mode and waits for a response from the network.

[0041] Furthermore, in step S4, after the device completes access according to the access time slot, it can use the access time slot for a small amount of business activities. When there are a large number of business needs, the corresponding application node will apply to the decision node for a large number of business time slots. After obtaining authorization, the node uses the authorized business time slot resources.

[0042] The technical solution proposed in this application has at least the following technical effects:

[0043] (1) This solution changes the allocation of time slot resources from a binding system to an application system. Instead of using the traditional method to bind time slots, the device needs to apply for the required time slot resources through resource application time slots, thereby optimizing the time slot allocation process. There is no need to retrieve historical records, renumber and set processes, so that the device can be used as needed, which improves the ease of use of the device.

[0044] (2) In the traditional time slot allocation method, the entire frame period is usually divided into several time slots during the time slot planning stage, and each time slot can only be occupied by a dedicated device. When there are fewer powered-on devices, it is impossible to occupy the vacant time slots. In this scheme, the length and position of the access time slots allocated by the decision node are not fixed. The access time slots can occupy idle time slots. Therefore, when the number of devices is small, more time slots can be occupied, thereby increasing the overall utilization of the time slots and allowing a single device to occupy more resources.

[0045] (3) Since the traditional method plans different time slots for several devices, the length of each time slot is very short, resulting in low bandwidth and high latency. In this solution, the length of the time slot required by the device can be allocated according to actual conditions, and the length of the service time slot is variable. After the decision node calculates the required time slot resource length based on the received traffic and the sent traffic, when the length of the idle time slot is sufficient, the corresponding access time slot will occupy the required length in the idle time slot, thereby improving the usage effect and increasing the flexibility of time slot planning. BRIEF DESCRIPTION OF THE DRAWINGS

[0046] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the structures shown in these drawings without paying creative work.

[0047] Figure 1 This is a flow chart of time slot access in the present invention.

[0048] Figure 2 This is a flowchart of node monitoring in the present invention.

[0049] Figure 3 Schematic diagram of the time slot resource list in the present invention Figure 1 .

[0050] Figure 4 Schematic diagram of the time slot resource list in the present invention Figure 2 .

[0051] Figure 5 Schematic diagram of the time slot resource list in the present invention Figure 3 .

[0052] Figure 6 Schematic diagram of the traditional time slot resource list.

[0053] Figure 7 This is a connection diagram of self-organizing network devices.

[0054] The realization of the purpose, functional features and advantages of the present invention will be further explained in conjunction with embodiments and with reference to the accompanying drawings. DETAILED DESCRIPTION

[0055] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0056] It should be noted that if the embodiments of the present invention involve directional indications (such as up, down, left, right, front, back, etc.), the directional indications are only used to explain the relative position relationship, movement status, etc. between the components in a certain specific posture. If the specific posture changes, the directional indication will also change accordingly.

[0057] In addition, if there are descriptions involving "first", "second", etc. in the embodiments of the present invention, the descriptions of "first", "second", etc. are only used for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of technical features indicated. Therefore, the features limited to "first" and "second" may explicitly or implicitly include at least one of the features. In addition, if "and / or" or "and / or" appears in the full text, its meaning includes three parallel solutions. Taking "A and / or B" as an example, it includes solution A, solution B, or solutions that satisfy both A and B. In addition, the technical solutions between the various embodiments can be combined with each other, but it must be based on the ability of ordinary technicians in this field to implement. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such combination of technical solutions does not exist and is not within the scope of protection required by the present invention.

[0058] See also Figure 1-Figure 7 The present invention proposes a time slot access method for a TDMA system, comprising the following steps:

[0059] S1. Each device in the entire network shares the same time slot resource list. In the time slot resource list, resource application time slots, access time slots, idle time slots and service time slots are defined. The resource application time slot is used for node devices to apply for resources through this time slot;

[0060] S2, apply for time slots through resources, and let the decision node within the network allocate the required time slot length and position to the applying node;

[0061] S3, the decision node allocates the corresponding access time slot according to the time slot length requested by the application node;

[0062] S4, the corresponding access application device occupies the idle time slot of the same position and length to complete the node access;

[0063] S5. When the device is powered off and the resources are used up, the access time slot resources will be quickly released.

[0064] Preferably, the method in the present solution can be applied to a self-organizing network system, or satellite communications, walkie-talkies, etc. When the present solution is applied to a self-organizing network system, the devices mentioned in the content are self-organizing network devices. When the present solution is applied to other aspects, the devices mentioned are devices in other aspects. Therefore, the present solution can be implemented through different devices according to different application scenarios. For ease of understanding, the devices mentioned in the following content of this embodiment are all self-organizing network devices. This approach is only to facilitate the understanding of technicians in this field, and is not a limitation of the present solution.

[0065] See also Figure 1 In this embodiment, a resource application time slot represented by brown is designed at the starting position of 0 and the length of 1. After each device is powered on, it can use this time slot to apply for resources, so that the decision node within the network can allocate the required time slot length and position to the application node (i.e., the self-organizing network device), and this time slot will not be occupied by other time slots. This time slot has a unique function and an unchangeable position. Each device can occupy the resource application time slot, but only resource application signaling is allowed to be sent. This signaling is designed for narrowband data and is sent quickly. After the data is sent, the resource application time slot needs to be released quickly. The green part in the figure represents the access time slot, and the yellow part represents the idle time slot or the service time slot. The idle time slot or the service time slot can be occupied by the access time slot.

[0066] Each self-organizing network device in the entire network will share and synchronize a time slot resource list. The content of this list includes which nodes are connected to the network and the access position of the corresponding nodes. The unoccupied time slot resource position is the idle time slot position, and the occupied and non-access time slot position is the service time slot. This information is synchronized and known to the entire network.

[0067] Further, step S2 includes the following contents:

[0068] S21, the self-organizing network device is powered on and monitors other nodes;

[0069] S22, judging the existence of a decision node according to the data intercepted in the monitoring phase;

[0070] S23. Apply for resources from the decision node in the resource application time slot.

[0071] Among them, the monitoring time can be determined according to actual conditions and there is no specific restriction.

[0072] Further, step S23 includes the following contents:

[0073] S231. In one frame period, each ad hoc network device that needs to apply for resources randomly occupies a resource application time slot;

[0074] S232, after the self-organizing network device, i.e., the application node, occupies the resource application time slot, it will send a resource application signaling packet to the decision node;

[0075] S233. Devices that have not occupied the resource application time slot, and devices whose applications have not been authorized by the decision node, will continue to apply through the random cycle of the resource application time slot until they apply for the time slot resources.

[0076] Optionally, the random method adopted in this embodiment is a random function. For example, self-organizing network device 1 is represented as 1, and self-organizing network device 2 is represented as 2. When the result of the random function is 1, then within this cycle, self-organizing network device 1 will occupy the resource application time slot for application, and will release the time slot after the application to avoid conflict with subsequent devices in this time slot, thereby avoiding the situation where multiple devices occupy this time slot at the same time.

[0077] Further, step S232 includes the following contents:

[0078] S2321, the ad hoc network device is connected to the terminal via a network cable;

[0079] S2322, after the self-organizing network device receives the data from the terminal and obtains the network port receiving flow value, it will calculate a communication gear according to the communication quality between itself and the decision node. This gear indicates the flow size that can be sent in the 1ms time slot length, that is, the air interface sending flow size;

[0080] S2323. Calculate the time slot resource length required by the ad hoc network device and express it in the following way:

[0081] Required time slot resource length = network port receiving traffic / 1ms air port sending traffic + 1;

[0082] S2324. The ad hoc network device sends a resource request signaling packet including the "required time slot resource length" to the decision node via the wireless air interface.

[0083] Since the self-organizing network device is connected to the terminal through a network cable, when the terminal needs to perform business communication, data will be generated. The data is transmitted through the network cable, and the data will generate the concept of traffic. When the self-organizing network device receives this data and receives the network port receiving traffic value, it will calculate a communication gear (determined by the modulation method in the self-organizing network device) based on the communication quality (SNR) between itself and the decision node. This gear indicates the size of the traffic that can be sent in a 1ms time slot length (1ms air interface sending traffic).

[0084] See also Figure 7In general, the decision node is confirmed by the node number in an ad hoc network. When ad hoc network device 1, ad hoc network device 2, and ad hoc network device 3 are networking, ad hoc network device 1 is the decision node, and the remaining nodes can apply for resources from ad hoc network device 1. Of course, ad hoc network device 1 can also apply for resources from itself.

[0085] Furthermore, step S3 includes the following contents:

[0086] S31, after receiving the resource request signaling packet, the decision node will calculate according to the length of the idle time slot resources remaining in the entire network;

[0087] S32, the decision node knows the starting position and length of the remaining idle time slots in the frame period, and subtracts the time slot resource length required by the self-organizing network device from the idle time slot length. If it is a positive number or 0, it is satisfied, and if it is a negative number, it is not satisfied;

[0088] S33. When resources are sufficient, the decision node will apply for node authorization.

[0089] Further, step S33 includes the following contents:

[0090] S331. When resources are sufficient, the decision node sends the starting position and length of the access time slot back to the application node via the air interface;

[0091] S332, after receiving the information, the applying node can send and receive related services at this location, that is, resource occupation, and the corresponding time slot resource list shared by the whole network will also be synchronously updated to indicate the occupation of this time slot resource by this applying node;

[0092] S333. When the applying node no longer performs business at this location, the time slot resource length required by the ad hoc network device changes to 0, and the corresponding time slot resource list also marks that this time slot position is idle, that is, it changes from an access time slot to an idle time slot.

[0093] Furthermore, step S21 includes the following contents:

[0094] S211, the self-organizing network device is powered on, and monitors whether there are other nodes that have been networked or not networked;

[0095] S212. If no signal from other devices is detected, the device will try to send a detection signal to notify other possible nodes.

[0096] S213. After attempting to transmit, the device will periodically stop transmitting and clear its own transmission time slot to re-monitor the signal;

[0097] S214, after clearing the transmission time slot, the device continues to monitor for a period of time to listen to the activities of other devices;

[0098] S215: If the device detects transmission from other devices during monitoring, indicating that other nodes exist, the device can apply for time slot resources.

[0099] Furthermore, the decision node in step S22 is the ss id node, that is, the time node with the smallest node number, and the ad hoc network device applies for time slot resources through this node.

[0100] Furthermore, in step S232, after the resource application signaling packet is transmitted, the device immediately releases the time slot resource, and after the release, the device enters the receiving mode and waits for a response from the network.

[0101] After releasing the time slot, the ad hoc network device will enter the receiving mode and wait for the response of the network. This can ensure that the ad hoc network device can receive the corresponding signaling in time.

[0102] Furthermore, in step S4, after the device completes subnet access according to the access time slot, it can use the access time slot for a small amount of business activities. When there are a large number of business needs, the corresponding application node will apply to the decision node for a large number of business time slots. After obtaining authorization, the node uses the authorized business time slot resources.

[0103] See also Figure 6 The time slot planning of the conventional ad hoc network system in the traditional way is shown in the figure. The numbers 0 to 79 with a white background represent the time slot length based on 0.5ms, and the numbers 1 to 26 with a green background represent the devices numbered with this number. The length covered by green is the time slot length occupied by this device. The starting position of the time slot of device No. 1 is 0 and the length is 1, the starting position of the time slot of device No. 2 is 3 and the length is 1, and so on. The working time slot lengths of 26 devices are all 1 and the time slots of adjacent devices are separated by 0.5ms idle time slots (except for 26 nodes and 1 node). There is an idle time slot for interval between the time slots occupied by two adjacent devices (that is, between two adjacent green time slots). The idle time slot interval ensures the stability of the system in actual work, so it must exist. The frame period shown in the figure is 80 0.5ms, so the frame period is 40ms.

[0104] See also Figure 3 In this embodiment, a node 1 represented by green is connected at the starting position 3 with a length of 1, and a node 2 represented by green is connected at the starting position 6 with a length of 1. This time slot is called an access time slot, that is, the time slot allocated by the decision node to the device after the device is powered on and the resource application time slot is used to apply for resources; the decision node allocates these two time slots to node 1 and node 2 for access respectively, and node 1 and node 2 can perform some basic business activities through the two time slots they occupy.

[0105] See also Figure 4 ,When the number of accessed nodes increases, the corresponding access time slot will change. ,The access time slot is not bound to the number set for a certain device, but is allocated to the device that applies for the time slot resource through the resource ,application time slot.

[0106] See also Figure 5 The idle time slot can be divided into multiple parts through the interval time slot. If there are multiple services in the current system, the idle time slot can be allocated on demand and divided by the interval time slot to be allocated to different nodes as service time slots.

[0107] It can be seen from the above embodiments that the working principle of the present invention is as follows:

[0108] See also Figure 1 , Figure 2 , the self-organizing network device is powered on, and monitors whether there are other nodes that have been networked or not, and keeps listening. If other nodes (i.e. self-organizing network devices) are detected before the listening timeout, resources are requested. If the listening timeout occurs, the device tries to transmit a detection signal, and keeps listening in the idle time slot after the transmission. If other nodes are detected, resources are requested. If other nodes are not detected, the device continues to listen.

[0109] According to the data intercepted in the monitoring phase, the existence of the decision node is judged among the multiple nodes intercepted. The time node with the smallest node number is the decision node, and resources are applied for the decision node. Specifically, the application node sends a resource application signaling packet. The resource application signaling packet is small in size and has a low transmission gear, so it has high sensitivity and can be demodulated correctly even when the wireless channel is poor. The resource application signaling packet can only be transmitted in the resource application time slot and the time slot resources are released immediately after the transmission. The application node enters the receiving state, and the next transmission time is randomly selected according to the random function to avoid conflicts among multiple application nodes.

[0110] In the resource application stage, the application node applies for the access time slot length from the decision node. The decision node will calculate based on the remaining length of the idle time slot and the access time slot length applied for, and determine whether a time slot of the corresponding length can be allocated. After applying for the access time slot resource, the decision node will send the starting position and length that can be used by the application node. The application node accesses the network based on this information to achieve networking access;

[0111] After the device completes network access according to the access time slot, it can perform a small amount of business activities according to the allocated access time slot. When there are a large number of business needs, the length of the original access time slot is insufficient. The corresponding application node will apply for a large number of business time slot resources from the decision node. After obtaining authorization, that is, after applying for business resources, the business time slot will occupy the idle time slot. The node can use a large number of authorized business time slot resources, which improves resource utilization. When a large number of business needs are completed, the application node will quickly release the business time slot resources and continue to use the access time slot resources to maintain networking. After the release is completed, the original business time slot position becomes an idle time slot;

[0112] When the device is powered off or the resource usage is completed, the resource application signaling in the network changes, and the access time slot resources are quickly released for subsequent work of other devices.

[0113] Through the above process, the application, access, use and release of time slot resources can be realized, which fully improves the utilization rate of resources.

[0114] The above description is only an exemplary embodiment of the present invention, and does not limit the patent scope of the present invention. All equivalent structural changes made by using the contents of the present invention specification and drawings under the technical concept of the present invention, or directly / indirectly applied in other related technical fields are included in the patent protection scope of the present invention.

Claims

1. A time slot access method for a TDMA system, characterized in that: The following steps are involved: S1. Every device in the entire network shares the same time slot resource list, which defines resource application time slots, access time slots, idle time slots, and service time slots. The resource application time slots are used by node devices to apply for resources through these time slots. S2. Apply for a time slot using the resource, and have the decision node within the network allocate the required time slot length and position to the applying node; S3. The decision node allocates the corresponding access time slot according to the time slot length requested by the applicant node; S4. The corresponding access-applying device occupies an idle time slot of the same position and length, completing node access. S5. When the device is powered off and resource usage is complete, the access timeslot and service timeslot resources will be quickly released.

2. The time slot access method of the TDMA system according to claim 1, characterized in that: The step S2 includes the following contents: S21, the device is powered on and monitors other nodes; S22. Determine the existence of a decision node based on the data intercepted during the monitoring phase; S23. Apply for resources from the decision node in the resource application time slot.

3. The time slot access method of the TDMA system according to claim 2, characterized in that: The step S23 includes the following contents: S231. In one frame period, each device that needs to apply for resources randomly occupies a resource application time slot; S232, after the device, i.e., the application node, occupies the resource application time slot, it sends a resource application signaling packet to the decision node; S233. The device that does not occupy the resource application time slot, and the device whose application is not authorized by the decision node, will continue to apply through the random cycle of the resource application time slot until the time slot resource is applied for.

4. The time slot access method of the TDMA system according to claim 3, characterized in that: The step S232 includes the following contents: S2321, connecting the device to the terminal; S2322: After receiving the data from the terminal and obtaining the received traffic value, the device calculates a communication level based on the communication quality between itself and the decision node. This level indicates the amount of traffic that can be sent within the time slot length of a single basic unit. S2323. Calculate the time slot resource length required by the device; S2324. The device sends a resource request signaling packet including the "required time slot resource length" to the decision node.

5. The time slot access method of the TDMA system according to claim 1, characterized in that: The step S3 includes the following contents: S31. After receiving the resource request signaling packet, the decision node will calculate based on the current idle time slot resource length of the entire network; S32. The decision node knows the starting position and length of the remaining idle time slots in the frame period. The decision node subtracts the time slot resource length required by the device from the idle time slot length. If the result is a positive number or 0, the requirement is met. If the result is a negative number, the requirement is not met. S33. When resources are sufficient, the decision node will apply for node authorization.

6. The time slot access method of the TDMA system according to claim 5, characterized in that: The step S33 includes the following contents: S331. When resources are sufficient, the decision node sends the starting position and length of the access time slot back to the application node; S332: After receiving the information, the applying node can send and receive related services at this location, i.e., occupy resources. The corresponding time slot resource list shared by the entire network will also be synchronously updated to indicate the occupation of this time slot resource by this applying node. S333. When the applying node no longer performs services at this location, the time slot resource length required by the device changes to 0, and the corresponding time slot resource list also marks this time slot position as idle, that is, it changes from an access time slot to an idle time slot.

7. The time slot access method of the TDMA system according to claim 2, characterized in that: The step S21 includes the following contents: S211: Power on the device and monitor whether there are other nodes that are already networked or not. S212. If no signal from other devices is detected, the device attempts to send a detection signal to notify other possible nodes. S213. After attempting to transmit, the device will periodically stop transmitting and clear its own transmission time slot to re-monitor the signal; S214. After clearing the transmit timeslot, the device continues to monitor for a period of time to listen to the activities of other devices; S215: If the device detects transmission from other devices during the monitoring period, indicating that other nodes exist, the device may apply for time slot resources.

8. The time slot access method of the TDMA system according to claim 2, characterized in that: The decision node in step S22 is the only designated node in the entire network, and the device applies for time slot resources through this node.

9. The time slot access method of the TDMA system according to claim 3, characterized in that: In step S232, after the resource request signaling packet is transmitted, the device immediately releases the time slot resource. After the release, the device enters the receiving mode and waits for the response of the network.

10. The time slot access method of the TDMA system according to claim 1, characterized in that: In step S4, after the device completes access according to the access time slot, it can use the access time slot to carry out a small amount of business activities. When there is a large amount of business demand, the corresponding application node will apply to the decision node for a large number of business time slots. After obtaining authorization, the node uses the authorized business time slot resources.

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