Multimode wireless intercom system converged communication method

Abstract

The application relates to the technical field of wireless communication, and discloses a multi-standard wireless intercom system fusion communication method, which comprises the following steps: S1. constructing a multi-standard wireless intercom system; S2. constructing a dynamic time slot division model based on time division multiple access (TDMA) technology, and dividing a time axis into a frame structure comprising fixed guarantee time slots and dynamically allocated time slots; S3. calculating the required time slots of each standard by using an adaptive signal mapping algorithm; constructing a synchronization mechanism to realize microsecond-level clock synchronization; S4. a resource allocation is performed by an intelligent scheduling platform according to an enhanced comprehensive communication demand index; and S5. data transmission and processing are realized according to the resource allocation; through time slot division based on the TDMA technology, signal mapping and the synchronization mechanism, the compatibility of the multi-standard wireless intercom system is realized, so that wireless intercom terminals of different standards can communicate in the same system, and the universality and expansibility of the system are improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of wireless communication, in particular to a multi-mode wireless intercom system fusion communication method. BACKGROUND

[0002] With the rapid development of wireless communication technology, different modes of wireless intercom systems such as digital trunking (TETRA, DMR), analog intercom, and public network intercom are widely used in emergency command, transportation, energy and chemical industries. For example, in the field of public safety, the police digital trunking (PDT) system used by the public security system has encryption communication and fast calling functions, while the conventional analog intercom system used by the fire department is characterized by high reliability; in the management of commercial buildings, the DMR digital intercom system commonly used by property management teams can realize group communication, while logistics enterprises rely more on public network intercom systems to realize cross-regional scheduling.

[0003] However, due to significant differences in frequency band allocation, modulation technology, signaling protocol, etc., interconnection and interworking between different systems are difficult to achieve. For example, digital trunking systems use TDMA time division multiple access technology, while analog intercom systems use FM frequency modulation technology, which have essential differences in signal processing mechanism and cannot be directly compatible. This technical barrier makes users often need to carry multiple terminal devices of different modes in actual application, which not only increases the use cost but also reduces the operation convenience.

[0004] The existing wireless intercom system also has problems such as low utilization rate of communication resources and inability to dynamically allocate resources according to actual needs. Traditional systems mostly use fixed channel allocation mode, when a certain channel is busy, other channel resources are idle, resulting in low overall communication efficiency. Especially in large activity places or complex industrial environments, multiple modes of wireless intercom devices are used at the same time, but they cannot work effectively with each other. In densely populated scenes such as music festivals and sports events, the intercoms used by different departments such as security, medical care, and logistics often have incompatible modes, resulting in information transmission delay, command execution confusion, and other situations; in high-risk industrial environments such as oil and chemical industries, communication between different devices is not smooth, which may even cause safety hazards, seriously affecting the timeliness and accuracy of communication.

[0005] To solve the above problems, we propose a multi-mode wireless intercom system fusion communication method. SUMMARY

[0006] The present application provides a multi-mode wireless intercom system fusion communication method for promoting the solution to the problems mentioned in the background.

[0007] One aspect

[0008] The application provides the following technical scheme: a multi-standard wireless intercom system fusion communication method, the fusion communication method comprising the following steps: S1. Constructing a multi-standard wireless intercom system, and the multi-standard wireless intercom system comprising a multi-standard access module, a TDMA core processing module, an intelligent scheduling platform and wireless intercom terminals of multiple standards;

[0009] S2. Constructing a dynamic time slot division model based on a time division multiple access (TDMA) technology, dividing a time axis into a frame structure comprising fixed guarantee time slots and dynamically allocated time slots, wherein the fixed guarantee time slots account for 30% of the total time slots and are preferentially allocated to emergency communication;

[0010] S3. Adopting an adaptive signal mapping algorithm to calculate the required time slots of each standard; and constructing a synchronization mechanism to realize microsecond-level clock synchronization;

[0011] S4. The intelligent scheduling platform allocates resources according to an enhanced comprehensive communication demand index;

[0012] S5. Realizing data transmission and processing according to the resource allocation.

[0013] Preferably, the multi-standard access module in S1 is used to access wireless intercom signals of different standards, and the wireless intercom signals of different standards comprise police digital trunking (PDT), digital mobile radio (DMR) and terrestrial trunked radio (TETRA); the TDMA core processing module uniformly processes signals of different standards based on the TDMA technology, realizing multi-standard compatibility; and the intelligent scheduling platform is used to dynamically allocate communication resources according to real-time communication demands of the system.

[0014] Through the above technical scheme, the intelligent scheduling platform dynamically allocates communication resources according to real-time communication demands of the system, ensuring the efficiency and stability of communication.

[0015] Preferably, the dynamic time slot division model in S2 is constructed by the TDMA core processing module, and the dynamic time slot division model executes the following strategies:

[0016] dividing the time axis into multiple frames, and each frame is further divided into a plurality of time slots;

[0017] Let the time length of a frame, i.e., the initial frame length, be T frame0 , the time length of each time slot be T slot , and the number of time slots contained in a frame be N

[0018] The wireless intercom signals of different standards are transmitted in the time slots, and for the signals of the PDT standard, n1 time slots are occupied, for the signals of the DMR standard, n2 time slots are occupied, and n1+n2≤N.

[0019] Introducing dynamic frame length adjustment mechanism: let the system load coefficient be p, and Where, ∑F j is the total workload of each task in the system, F max is the maximum processing capacity of the system;

[0020] The dynamic frame length calculation formula is: T frame = T frame0 ×(1+α·p), where T frame represents the adjusted dynamic frame length, a is the adjustment coefficient, and 0< a <1, the adjustment coefficient is used to control the adjustment range of the frame length with the load change;

[0021] When the system load exceeds the threshold p th , the frame length expansion is triggered, and the maximum expansion number does not exceed 2 times;

[0022] The time slot allocation adopts a hierarchical structure, and the number of time slots N contained in a frame, i.e. the total time slot, is divided into:

[0023] The fixed guarantee time slot N f accounts for 30%, and is preferentially allocated to emergency communication;

[0024] The dynamic allocation time slot N d accounts for 70%, and is allocated according to real-time demand;

[0025] And satisfy Where K is the number of emergency terminals, and l is the minimum time slot demand of a single terminal.

[0026] Through the above technical scheme, in the TDMA core processing module, time division multiple access technology is used to finely manage time resources. Specifically, the system divides the time axis into a plurality of frames that are periodically repeated, each frame as an independent time unit, carrying the transmission task of multiple standard wireless intercom signals. In order to realize the parallel transmission of multiple signals, each frame is further divided into a plurality of non-overlapping time slots, which are like "data channels" in the time dimension, providing exclusive transmission windows for different signals.

[0027] Preferably, the adaptive signal mapping algorithm is used in S3 to calculate the number of time slots required for each standard, and the signals of different standards are mapped into the corresponding time slots, specifically:

[0028] For the i-th standard signal, let its data rate be R i , then the amount of data it can transmit in a time slot is D i =R i ×T slot ;

[0029] According to the data amount of the signal and the capacity of the time slot, the following strategy is adopted to determine the time slot allocation of the signal in the frame, and the specific strategy is as follows:

[0030] Suppose that the i-th signal needs m i time slots, then wherein D totali,i is the total data amount of the i-th signal needed to be transmitted in a frame, represents the rounding up operation;

[0031] The number of time slots needed by the i-th signal is corrected by adding an interference suppression factor, and the corrected number is as follows: wherein μ i is the interference attenuation coefficient of the signal, and is calculated by real-time monitoring of the channel bit error rate BER i , and μ i = 0.1 x BER i / BER th , BER th is a threshold value.

[0032] Through the above technical solution, the rounding up mechanism ensures that even if the remaining data amount is insufficient for a complete time slot, a time slot is still allocated to ensure complete data transmission and avoid information loss. In actual application, considering the priority mechanism of system scheduling, the PDT signal usually adopts a sequential allocation strategy, that is, starting from the starting time slot of the frame, the time slots are allocated sequentially. This allocation method can effectively reduce the complexity of signal scheduling and reduce transmission delay. At the same time, in order to avoid interference between signals of different modes, the system also reserves a certain number of guard time slots to ensure the stability of signal conversion between adjacent time slots.

[0033] Preferably, the synchronization mechanism in S3 enables signals of different modes to be accurately transmitted in respective time slots in the multi-mode wireless intercom system, and the synchronization mechanism adopts a synchronization method based on a common synchronization channel, sets a synchronization time slot at a fixed position of each frame, and sends a synchronization signal. The synchronization mechanism adopts the following strategy:

[0034] Suppose that the period of the synchronization signal is T sync , and T sync is an integer multiple of T frame , and the formula is T sync =k x T frame , k is a positive integer;

[0035] In the synchronization time slot, a synchronization data packet containing timestamp and frame number information is sent, and after each device receives the synchronization data packet, the clock frequency and phase are adjusted according to the timestamp and the clock deviation of the device itself to maintain synchronization in subsequent time slot transmission. On the basis of the synchronization mechanism, a proportional-integral control algorithm (PI algorithm) is introduced to optimize the synchronization adjustment process, and the specific strategy is as follows:

[0036] Let the clock offset be Δt j Synchronous adjustment amount δ j The calculation formula is: δ j =k p ·Δt j +k i ·∫Δt j dt, where k p k is the proportionality coefficient. i The integral coefficient is used to achieve microsecond-level synchronization through PI control;

[0037] The synchronization signal transmission period is dynamically adjusted to: T sync =k×T frame ×(1+β·σ t ), where σ t β represents the standard deviation of the system clock jitter, and β is the compensation coefficient.

[0038] To further improve synchronization accuracy, a proportional-integral (PI) control algorithm was introduced to optimize the synchronization adjustment process, building upon the existing synchronization method based on a common synchronization channel. Simultaneously, considering the impact of system clock jitter on synchronization performance, a dynamic adjustment strategy for the synchronization signal transmission period was designed.

[0039] Preferably, in S4, the intelligent scheduling platform obtains the communication needs of each terminal by real-time monitoring of the communication requests, data traffic, and signal strength of each wireless intercom terminal and constructing a communication demand perception model. Specifically, the communication demand perception model is as follows:

[0040] Suppose there are M wireless intercom terminals in total. For the j-th terminal, the urgency level of its communication request is E. j E j The value range is 1-5, with 5 representing the highest level of urgency;

[0041] The current data flow is F j The signal strength is S j The integrated communication requirement index Q of this terminal j Calculated using the following formula: Where α′, β′, and γ are weighting coefficients, and α′+β′+γ=1, F′ max S is the maximum data traffic that the system can support. max and S min These represent the maximum and minimum signal strength values, respectively. Through the aforementioned technical solution, the differentiated needs of terminals in different scenarios can be accurately captured. Using the communication demand perception model, the intelligent scheduling platform can comprehensively and accurately understand the communication needs of each terminal. Based on this, and combined with the actual total amount of communication resources, scientific and rational resource allocation can be carried out.

[0042] Preferably, the intelligent scheduling platform allocates the communication resources according to the communication demand of each terminal obtained by the communication demand perception model, adopts a dynamic programming algorithm, and sets that the system has N' time slots in total which can be used for allocation, and for the i-th time slot, the terminal set which can be allocated is T i When allocating the time slots, the integrated communication demand index Q j is preferentially met, and the specific algorithm steps are as follows:

[0043] A1. Initialization: mark all time slots as unallocated, and the number of allocated time slots of all terminals is 0;

[0044] A2. Traverse all terminals, and calculate the integrated communication demand index Q j of each terminal;

[0045] A3. For each time slot i, select the terminal j with the highest integrated communication demand index Q i from the terminal set T j , allocate the time slot i to the terminal, and update the number of allocated time slots of the terminal;

[0046] A4. Repeat A3 until all time slots are allocated or the communication demand of all terminals is met;

[0047] In the allocation process, if there are multiple terminals with the same Q j , allocation is performed according to the priority of the terminals.

[0048] Through the above technical solution, through this dynamic programming algorithm, the communication resources can be reasonably allocated according to the real-time communication demand, and the resource utilization rate and communication quality are improved.

[0049] Preferably, the data transmission and processing in S5 are divided into a sending end and a receiving end, and when the sending end has data to send, the specific steps are as follows:

[0050] B1. According to the communication system to which the terminal belongs, complete data encapsulation according to the corresponding protocol;

[0051] B2. After encapsulation, the data is immediately transmitted to the multi-standard access module, and the multi-standard access module accurately sends the data packet to the TDMA core processing module within the specified time window according to the time slot resources pre-allocated by the TDMA core processing module;

[0052] B3. After receiving the data, the TDMA core processing module starts the integration and processing process, adds time slot number and frame number control information, completes the optimization processing of the data, and then forwards the processed data packet to the intelligent scheduling platform;

[0053] B4. The intelligent scheduling platform dynamically plans the data transmission path and target receiving terminal based on the pre-set communication resource allocation strategy, and forwards the data packets to the corresponding transmission link to ensure that the data arrives at the destination.

[0054] Through the above technical solution, when the target terminal is in a coverage area of ​​different standards, the platform will trigger a protocol conversion mechanism to repackage the data into a format that can be recognized by the target standard, and finally forward the data to the target receiving terminal accurately through the selected transmission link.

[0055] Preferably, at the receiving end, the wireless intercom terminal maintains precise synchronization with the system through a synchronization mechanism and monitors the channel within the allocated time slot, specifically as follows:

[0056] C1. When data arrives, the TDMA core processing module performs a frame deframe operation to extract valid data and control information;

[0057] C2. Based on the communication standard corresponding to the data, it is transmitted to the multi-standard access module. The multi-standard access module performs decapsulation processing on the data according to the corresponding standard protocol, restores the original data, and pushes it to the receiving end for processing and visualization.

[0058] Through the above technical solution, the intelligent scheduling platform runs through the entire data transmission process, monitoring the data reception status in real time, including whether the data was successfully received and whether there were any anomalies such as packet loss. Once an anomaly is detected, the platform will respond quickly, dynamically adjusting the communication resource allocation scheme and transmission strategy to ensure the stability and reliability of data transmission.

[0059] The present invention has the following beneficial effects:

[0060] By using time slot division, signal mapping and synchronization mechanisms based on Time Division Multiple Access (TDMA) technology, compatibility of multi-standard wireless intercom systems is achieved, enabling wireless intercom terminals of different standards to communicate in the same system, thus improving the system's versatility and scalability.

[0061] The intelligent scheduling platform, through a communication demand perception model and dynamic programming resource allocation algorithm, can dynamically and rationally allocate communication resources according to the system's real-time communication needs, improving the utilization rate of communication resources and ensuring the efficiency and stability of communication. For example, during peak communication demand periods, it can prioritize allocating more time slot resources to terminals with urgent communication requests and large data traffic, ensuring the smooth operation of critical communications.

[0062] This multi-standard wireless intercom system converged communication method improves the problems of low communication resource utilization and inability to work collaboratively in existing wireless intercom systems, and provides a more reliable and efficient solution for communication in various scenarios, with broad application prospects. Attached Figure Description

[0063] Figure 1 The system flowchart of the present application.

[0064] Figure 2 The step flowchart of the present application dynamic planning algorithm for allocating communication resources.

[0065] Figure 3 The specific step flowchart of the present application when the sending end has data to send.

[0066] Figure 4 The flowchart of the present application wireless intercom terminal keeping accurate synchronization with the system through the synchronization mechanism. DETAILED DESCRIPTION

[0067] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of protection of the present application.

[0068] Embodiment 1, refer to Figures 1-4 The multi-mode wireless intercom system fusion communication method comprises the following steps:

[0069] S1. Constructing a multi-mode wireless intercom system, and the multi-mode wireless intercom system comprises a multi-mode access module, a TDMA core processing module, an intelligent dispatching platform and a plurality of modes of wireless intercom terminals;

[0070] The multi-mode access module is used for accessing wireless intercom signals of different modes, and the wireless intercom signals of different modes comprise police digital trunking, digital mobile radio and land mobile radio, wherein the police digital trunking is PDT, the digital mobile radio is DMR, and the land mobile radio is TETRA; the TDMA core processing module uniformly processes signals of different modes based on time division multiple access TDMA technology, to realize multi-mode compatibility; the intelligent dispatching platform is used for dynamically allocating communication resources according to real-time communication demands of the system;

[0071] S2. Constructing a dynamic time slot division model based on TDMA technology, and dividing a time axis into a frame structure comprising fixed guarantee time slots and dynamically allocated time slots, wherein the fixed guarantee time slots account for 30% of the total time slots and are preferentially allocated to emergency communication;

[0072] The dynamic time slot division model is constructed by the TDMA core processing module in S2, and the dynamic time slot division model executes the following strategies:

[0073] The time axis is divided into multiple frames, and each frame is further divided into a plurality of time slots;

[0074] The time length of a frame, i.e. the initial frame length, is T frame0 The time length of each time slot is T slot The number of time slots contained in a frame is N

[0075] Different mode wireless intercom signals are transmitted in time slots, and for the signals of the PDT mode, n1 time slots are occupied, and for the signals of the DMR mode, n2 time slots are occupied, and n1+n2≤N;

[0076] A dynamic frame length adjustment mechanism is introduced: the system load coefficient is ρ, and Where ∑F j is the total workload of each task in the system, and F max is the maximum processing capacity of the system;

[0077] The dynamic frame length calculation formula is: T frame =T frame0 ×(1+α·ρ), where T frame represents the adjusted dynamic frame length, α is the adjustment coefficient, and 0<α<1, and the adjustment coefficient is used to control the adjustment range of the frame length with the load;

[0078] When the system load exceeds the threshold value ρ th , the frame length expansion is triggered, and the maximum expansion number does not exceed 2 times;

[0079] The time slot allocation adopts a hierarchical structure, and the number of time slots contained in a frame N, i.e. the total time slots, is divided into:

[0080] The fixed guarantee time slots N f account for 30%, and are preferentially allocated to emergency communication;

[0081] The dynamic allocation time slots N d account for 70%, and are allocated according to real-time demand;

[0082] And satisfy Where K is the number of emergency terminals, and λ is the minimum time slot demand of a single terminal.

[0083] S3. Adopt an adaptive signal mapping algorithm to calculate the number of time slots required for each mode; and construct a synchronization mechanism to achieve microsecond-level clock synchronization;

[0084] In S3, an adaptive signal mapping algorithm is used to calculate the number of time slots required for each mode, and signals of different modes are mapped into corresponding time slots, specifically:

[0085] For the signals of the i-th mode, let its data rate be R iThe data amount that it can transmit in one time slot is D i = R i × T slot ;

[0086] According to the data amount of the signal and the capacity of the time slot, the following strategy is adopted to determine the time slot allocation of the signal in the frame, and the specific strategy is as follows:

[0087] Suppose that the i-th signal needs m i time slots, then wherein D totali,i is the total data amount of the i-th signal that needs to be transmitted in one frame, represents the rounding-up operation;

[0088] The interference suppression factor is added, and the number of time slots needed by the i-th signal is corrected as follows: wherein μ i is the interference attenuation coefficient of the signal, and is calculated by real-time monitoring of the channel bit error rate BER i , and μ i = 0.1 × BER i / BER th , and BER th is a threshold value.

[0089] The synchronization mechanism enables signals of different formats to be accurately transmitted in their respective time slots in the multi-format wireless intercom system, and the synchronization mechanism adopts a synchronization method based on a common synchronization channel, sets a synchronization time slot at a fixed position of each frame, sends a synchronization signal, and adopts the following strategy:

[0090] Suppose that the period of the synchronization signal is T sync , and T sync is an integer multiple of T frame , and the formula is as follows: T sync = k × T frame , wherein k is a positive integer;

[0091] In the synchronization time slot, a synchronization data packet containing timestamp and frame number information is sent, and after each device receives the synchronization data packet, the clock frequency and phase are adjusted according to the timestamp therein and the clock offset of the device itself, so that synchronization is maintained in subsequent time slot transmission; on the basis of the synchronization mechanism, a proportional-integral control algorithm (PI algorithm) is introduced to optimize the synchronization adjustment process, and the specific strategy is as follows:

[0092] Suppose that the clock offset is Δt j , and the synchronization adjustment amount δ j is calculated as follows: δ j = k p · Δt j + k i · ∫Δtj dt, wherein k p is a proportional coefficient, k i is an integral coefficient, and subtle level synchronization is achieved through PI control;

[0093] The synchronization signal transmission period is dynamically adjusted as T sync = k x T frame x (1 + β x σ t ), wherein σ t is a standard deviation of system clock jitter, and β is a compensation coefficient;

[0094] S4. The intelligent scheduling platform allocates resources according to the enhanced integrated communication demand index;

[0095] The intelligent scheduling platform constructs a communication demand perception model to obtain the communication demand of each terminal by monitoring the communication request, data flow, and signal strength of each wireless intercom terminal in real time, and the communication demand perception model is specifically:

[0096] Suppose there are M wireless intercom terminals, and the emergency degree of the communication request of the jth terminal is E j , wherein the value range of E j is 1-5, and 5 represents the highest emergency degree;

[0097] The current data flow is F j , the signal strength is S j , and the integrated communication demand index Q j of the terminal is calculated through the following formula: wherein α', β', and γ are weight coefficients, and α' + β' + γ = 1, F' max is the maximum data flow that the system can support, S max and S min are the maximum value and minimum value of the signal strength, respectively; the intelligent scheduling platform allocates communication resources according to the communication demand of each terminal obtained by the communication demand perception model, and supposes that the system has N' time slots in total that can be used for allocation, and for the ith time slot, the terminal set that can be allocated is T i , and when the time slot is allocated, the integrated communication demand index Q j is prioritized, and the specific algorithm steps are as follows:

[0098] A1. Initialization: mark all time slots as unallocated, and the number of allocated time slots of all terminals is 0;

[0099] A2. Traverse all terminals to calculate the integrated communication demand index Q j of each terminal;

[0100] A3. For each time slot i, from the terminal set T iThe integrated communication demand index Q is selected j The highest terminal j is allocated with the time slot i, and the number of allocated time slots of the terminal is updated;

[0101] A4. Repeat A3 until all time slots are allocated or the communication demand of all terminals is met;

[0102] In the allocation process, if there are multiple terminals with the same Q j , allocation is performed according to the priority of the terminal;

[0103] S5. According to the resource allocation, data transmission and processing are realized;

[0104] In S5, data transmission and processing are divided into a sending end and a receiving end. When the sending end has data to send, the specific steps are as follows:

[0105] B1. According to the communication standard to which the terminal belongs, data encapsulation is completed according to the corresponding protocol;

[0106] B2. After encapsulation, the data is immediately transmitted to the multi-standard access module, which sends the data packet to the TDMA core processing module in the specified time window according to the time slot resource allocated by the TDMA core processing module in advance;

[0107] B3. After receiving the data, the TDMA core processing module starts the integration and processing process, adds time slot number and frame number control information, completes the optimization processing of the data, and then forwards the processed data packet to the intelligent scheduling platform;

[0108] B4. The intelligent scheduling platform dynamically plans the data transmission path and target receiving terminal based on the pre-set communication resource allocation strategy, and forwards the data packet to the corresponding transmission link to ensure that the data reaches the destination.

[0109] The receiving end, the wireless intercom terminal, keeps accurate synchronization with the system through the synchronization mechanism and listens to the channel in the allocated time slot, specifically as follows:

[0110] C1. When the data arrives, the TDMA core processing module performs frame extraction operation to extract valid data and control information;

[0111] C2. According to the corresponding communication standard of the data, it is transmitted to the multi-standard access module, which performs decapsulation processing on the data according to the corresponding standard protocol, restores the original data, and then pushes it to the receiving end for processing and visual presentation.

[0112] Embodiment 2

[0113] For ease of understanding, the method is described in detail taking the application in a large-scale event place as an example.

[0114] In a large sports event venue, security personnel use PDT system wireless intercom equipment for security patrol and command, venue staff use DMR system wireless intercom equipment for daily work coordination, and some emergency rescue personnel use TETRA system wireless intercom equipment as a backup communication means. Because different system equipment cannot directly communicate, information transmission is not smooth, affecting work efficiency.

[0115] System building: according to the method of the application, a multi-system wireless intercom system converged communication system is built. A multi-system access module is deployed to access wireless intercom signals of three systems of PDT, DMR and TETRA. A TDMA core processing module is configured, and the frame length T frame = 100 ms and the time slot length T slot = 5 ms, so that one frame contains slots, and the intelligent scheduling platform monitors the communication requirements of each terminal in real time.

[0116] During the event, the security personnel find a security hazard and send an emergency communication request through the PDT system terminal. The emergency degree of its communication request E = 5, the current data flow F = 50 bits / s, and the signal strength S = -55 dBm. The venue staff are arranging the venue and have a large data flow F = 200 bits / s, the communication request emergency degree E = 3, and the signal strength S = -60 dBm. The intelligent scheduling platform calculates the comprehensive communication requirement index of the security personnel terminal according to the communication requirement perception model The comprehensive communication requirement index of the venue staff terminal

[0117] In resource allocation, the intelligent scheduling platform allocates more time slot resources to the security personnel terminal to ensure that its emergency communication can be carried out in time and smoothly. At the same time, according to the TDMA mechanism, signals of different systems are transmitted in the time slots allocated to them, realizing compatible communication of multiple systems and improving the communication efficiency and collaborative work ability of the entire venue.

[0118] It should be noted that in this text, relational terms such as first and second are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "contain" or any other variant thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed or inherent to such a process, method, article or device.

[0119] The above merely describes the preferred embodiments of the present application, and it should be pointed out that those skilled in the art can make several improvements and refinements without departing from the technical principles of the present application, and these improvements and refinements should also be considered as falling within the protection scope of the present application.

Claims

1. A converged communication method for multi-standard wireless intercom systems, characterized in that, The converged communication method includes the following steps: S1. Construct a multi-standard wireless intercom system, which includes a multi-standard access module, a TDMA core processing module, an intelligent dispatch platform, and wireless intercom terminals of various standards. S2. Based on Time Division Multiple Access (TDMA) technology, a dynamic time slot partitioning model is constructed, which divides the time axis into a frame structure containing fixed guaranteed time slots and dynamically allocated time slots. The fixed guaranteed time slots account for 30% of the total time slots and are given priority for emergency communications. In S2, a dynamic time slot partitioning model is constructed through the TDMA core processing module, and the dynamic time slot partitioning model executes the following strategy: the time axis is divided into multiple frames, and each frame is further divided into several time slots; Let the duration of a frame, i.e., the initial frame length, be T. frame0 The time length of each time slot is T. slot Then the number of time slots contained in a frame Different types of wireless intercom signals are transmitted in time slots. For PDT signals, n1 time slots are occupied, and for DMR signals, n2 time slots are occupied, and n1+n2≤N. Introducing a dynamic frame length adjustment mechanism: Let the system load coefficient be ρ, and Where, ∑F j F represents the total workload of all tasks in the system. max This represents the system's maximum processing capacity. The formula for calculating dynamic frame length is: T frame =T frame0 ×(1+α·ρ), where T frame This represents the adjusted dynamic frame length, where α is the adjustment coefficient, and 0 < α < 1. The adjustment coefficient is used to control the adjustment range of the frame length as the load changes. When the system load exceeds the threshold ρ th When this occurs, frame length expansion is triggered, and the maximum expansion number does not exceed twice the frame length. The time slot allocation adopts a hierarchical structure, dividing the number of time slots N in a frame, i.e., the total number of time slots, into: Fixed guarantee time slot N f 30% will be allocated preferentially to emergency communications; Dynamically allocate time slot N d 70% will be allocated based on real-time demand. And satisfy N f +N d =N, Where K is the number of emergency terminals, and λ is the minimum time slot requirement for a single terminal; S3. Calculate the number of time slots required for each standard using an adaptive signal mapping algorithm; construct a synchronization mechanism to achieve microsecond-level clock synchronization; S3 employs an adaptive signal mapping algorithm to calculate the required number of time slots for each standard, mapping signals from different standards to corresponding time slots. Specifically: For the signal of the i-th type, let its data rate be R. i Then the amount of data it can transmit in one time slot is D. i =R i ×T slot ; Based on the data volume and time slot capacity of the signal, the following strategy is adopted to determine the time slot allocation of this standard signal in the frame. The specific strategy is as follows: Let the i-th type of signal require m i Each time slot, then Among them, D totali,i Let be the total amount of data that the i-th type of signal needs to transmit in one frame. This indicates the rounding up operation; By increasing the interference suppression factor, the number of time slots required for the i-th signal type is corrected as follows: Where, μ i This is the interference attenuation coefficient for the signal of this standard, and it is calculated by real-time monitoring of the channel bit error rate (BER). i It was calculated that, at the same time, μ i =0.1×BER i / BER th BER th This is the threshold value; The synchronization mechanism in S3 enables signals of different standards to be transmitted accurately within their respective time slots in a multi-standard wireless intercom system. The synchronization mechanism adopts a synchronization method based on a common synchronization channel, sets a synchronization time slot at a fixed position in each frame, and sends a synchronization signal. The synchronization mechanism employs the following strategy: Let the period of the synchronization signal be T. sync And T sync It is T frame Multiples of T are given by the formula: T sync =k×T frame k is a positive integer; Within the synchronization time slot, synchronization data packets containing timestamps and frame numbers are sent. Upon receiving these packets, each device adjusts its clock frequency and phase based on the timestamp and its own clock offset to maintain synchronization in subsequent time slot transmissions. A proportional-integral (PI) control algorithm is introduced to optimize the synchronization adjustment process based on this synchronization mechanism. The specific strategy is as follows: Let the clock offset be Δt j Synchronous adjustment amount δ j The calculation formula is: δ j =k p ·Δt j +k i ·∫Δt j dt, where k p k is the proportionality coefficient. i The integral coefficient is used to achieve microsecond-level synchronization through PI control; The synchronization signal transmission period is dynamically adjusted to: T sync =k×T frame ×(1+β·σ t ), where σ t β is the standard deviation of system clock jitter, and β is the compensation coefficient; S4. The intelligent scheduling platform allocates resources based on enhanced integrated communication demand indicators; S5. Based on resource allocation, realize data transmission and processing.

2. The multi-standard wireless intercom system converged communication method according to claim 1, characterized in that, The multi-standard access module in S1 is used to access wireless intercom signals of different standards, including police digital trunking, digital mobile radio, and terrestrial trunking radio. The police digital trunking is PDT, the digital mobile radio is DMR, and the terrestrial trunking radio is TETRA. The TDMA core processing module processes the signals of different standards uniformly based on time division multiple access (TDMA) technology to achieve multi-standard compatibility. The intelligent scheduling platform is used to dynamically allocate communication resources according to the real-time communication needs of the system.

3. The multi-standard wireless intercom system converged communication method according to claim 1, characterized in that, The intelligent scheduling platform in S4 obtains the communication needs of each terminal by monitoring the communication requests, data traffic, and signal strength of each wireless intercom terminal in real time and constructing a communication demand perception model. The communication demand perception model is as follows: Suppose there are M wireless intercom terminals in total. For the j-th terminal, the urgency level of its communication request is E. j E j The value range is 1-5, with 5 representing the highest level of urgency; The current data flow is F j The signal strength is S j The integrated communication requirement index Q of this terminal j Calculated using the following formula: Where α′, β′, and γ are weighting coefficients, and α′+β′+γ=1, F′ max S is the maximum data traffic that the system can support. max and S min These represent the maximum and minimum signal strength values, respectively.

4. The multi-standard wireless intercom system converged communication method according to claim 3, characterized in that, The intelligent scheduling platform allocates communication resources based on the communication needs of each terminal obtained from the communication demand perception model, using a dynamic programming algorithm. Assume the system has a total of N′ time slots available for allocation. For the i-th time slot, the set of terminals that can be allocated to it is T. i When allocating time slots, priority should be given to meeting the comprehensive communication demand index Q. j The specific algorithm steps are as follows: A1. Initialization: Mark all time slots as unallocated, and set the number of allocated time slots for all terminals to 0; A2. Iterate through all terminals and calculate the comprehensive communication demand index Q for each terminal. j ; A3. For each time slot i, from the terminal set T i Select the comprehensive communication demand index Q j The highest-ranking terminal j is assigned time slot i and the number of allocated time slots for that terminal is updated. A4. Repeat A3 until all time slots are allocated or the communication needs of all terminals are met; During the allocation process, if multiple terminals have Q... j In the same case, allocation is made according to the terminal's priority.

5. The multi-standard wireless intercom system converged communication method according to claim 4, characterized in that, In S5, data transmission and processing are divided into a sending end and a receiving end. When the sending end has data to send, the specific steps are as follows: B1. Based on its own communication standard, data encapsulation is completed in accordance with the corresponding protocol; B2. After encapsulation, the data is immediately transmitted to the multi-standard access module. The multi-standard access module accurately sends the data packet to the TDMA core processing module within the specified time window according to the time slot resources pre-allocated by the TDMA core processing module. After receiving the data, the B3.TDMA core processing module initiates the integration and processing process. By adding time slot number and frame number control information, it completes the data optimization processing and then forwards the processed data packet to the intelligent scheduling platform. B4. The intelligent scheduling platform dynamically plans the data transmission path and target receiving terminal based on the pre-set communication resource allocation strategy, and forwards the data packets to the corresponding transmission link to ensure that the data arrives at the destination.

6. The multi-standard wireless intercom system converged communication method according to claim 5, characterized in that, At the receiving end, the wireless intercom terminal maintains precise synchronization with the system through a synchronization mechanism and monitors the channel within the allocated time slots, specifically as follows: C1. When data arrives, the TDMA core processing module performs a frame deframe operation to extract valid data and control information; C2. Based on the communication standard corresponding to the data, it is transmitted to the multi-standard access module. The multi-standard access module performs decapsulation processing on the data according to the corresponding standard protocol, restores the original data, and pushes it to the receiving end for processing and visualization.

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