5g wireless communication signal access control method based on intelligent multi-variable multi-service

Abstract

The application discloses a 5G wireless communication signal access control method based on intelligent multi-rate multi-service, and relates to the technical field of 5G wireless communication connection access control; the method comprises the following steps: constructing a 5G wireless communication system model based on intelligent multi-rate multi-service, establishing an access control condition of a user in a coverage area; designing an access control strategy function of the coverage area, adopting a CP strategy function as an access control strategy basis, modeling the access control strategy based on the access control condition; simulating the mobile behavior of the user in the 5G wireless communication system model, calculating the change probability of the 5G wireless communication signal of the user; and according to the multi-dimensional birth and death process evolution of the coverage area, calculating the blocking probability and the dropping probability of the coverage area after the coverage area occupation state is processed by the access control strategy function. Through the adaptive mechanism of the multi-rate service, the application can effectively reduce the blocking and dropping probability in the mobile process of the user, so as to improve the system resource utilization and the connection rate.

Description

Technical Field

[0001] This invention belongs to the field of 5G wireless communication connection access control technology, and particularly relates to a 5G wireless communication signal access control method based on intelligent multi-rate multi-service. Background Technology

[0002] 5G wireless communication systems provide wide-area network coverage. When users move within the coverage area, they switch connections between different 5G wireless communication systems according to their roaming protocols; this connection switching process is called handover. The evolution of 5G wireless communication systems has spurred a strong demand for multimedia services with guaranteed quality of service (QoS). Connection access control mechanisms are widely used in 5G wireless communication networks to selectively limit the number of access calls for various services, maximizing network resource utilization while meeting constraints. In 5G wireless communication systems, different services (such as voice and real-time video) have different QoS requirements; therefore, access control policies must be used to control the number of connections in each access network. The role of access control policies is to decide whether to accept a connection and allocate resources, or to reject the connection request directly, upon receiving it. Typically, the system prioritizes connection requests from handover users rather than newly initiated connection requests. From a user experience perspective, sudden connection interruptions are more frustrating than occasional blocking of new connections.

[0003] Standard connection access control mechanisms include: Guard Channel (GC), Queuing Priority (QP), Cutoff Priority (CP), Fractional Guard Channel (FG), and multi-threshold mechanisms. Most studies consider only a single service type, assuming all arriving connection requests occupy the same bandwidth. Therefore, some researchers have proposed multi-service access control strategies for multi-service wireless networks, such as Chao and Chen, Stratogiannis et al., and Stevens-Navarro et al.

[0004] Chao and Chen studied access control in mobile personal communication networks, focusing on access control for multiple call types with user mobility. They proposed and analyzed a general coordinate-convex access control strategy. Stratogiannis et al. developed a scheme to progressively suppress the access rate of new calls in each service class (SC) and process them independently according to the priority of each service. Performance analysis was conducted under general conditions of single-service and multi-service scenarios. Stevens-Navarro et al. extended the CP and FG strategies by introducing a policy function and evaluated four different combinations of access control strategies. They found that when both access networks use the CP strategy, the system performance is optimal under different connection request rates and user mobility conditions. This CP strategy reserves a fixed number of channels for switching users; if there are no available non-reserved channels, the connection request of a new user will be blocked. Network performance was evaluated by analyzing the blocking rate and drop rate of new calls and switching calls.

[0005] Most existing research on access control strategies regarding call blocking and dropped calls fails to consider the adaptive handling of diverse services in 5G wireless communication systems. Current mobile 5G wireless communication systems already support various call services, such as voice and video calls, but the bandwidth requirements for these services are typically fixed. If the bandwidth of these services could be flexibly adjusted, access control strategies based on intelligent variable rates could significantly reduce call blocking and dropped call rates, thereby improving the resource utilization of 5G wireless communication systems and meeting security requirements. Intelligent variable rates employ a novel and flexible implementation method to achieve flexible adjustment of call service bandwidth. For example, the voice coding standard G.722 supports dynamic bandwidth adjustment, and the multiple description coding (MDC) technology in video coding can also flexibly control the bandwidth requirements of video services.

[0006] The voice encoder is the fourth voice compression standard developed by the European Telecommunications Standards Institute (ETSI). This voice compression algorithm is consistent across GSM and WCDMA systems, reducing the encoding rate of source voice from 12.2 kb / s to a minimum of 4.75 kb / s. In the GSM system, Smart Multirate (SMMT) offers two voice channel modes: Smart Full Rate and Smart Half Rate. The total bit rate for Smart Full Rate is 22.8 kb / s, and for Smart Half Rate it is 11.4 kb / s. This "total bit rate" refers to the sum of the bit rate of the voice encoder and the bit rate of the channel encoder. Mobile terminals equipped with a Smart Multirate encoder can request to use a specific transmission mode.

[0007] Intelligent Multi-Rate Video Coding (MCD) splits a single media stream into multiple sub-streams (n ≥ 2), each sub-stream being called a "description". These description packets can be transmitted via multiple paths. MDC is essentially a data segmentation technique that has been applied to standards such as MPEG-2 and MPEG-4. In this invention, a single video media stream is split into two sub-streams, each serving as a different description for multi-description coding.

[0008] Intelligent multi-rate broadband encoders can be used for bandwidth adaptation in voice services and video services. If both voice and video call services support adaptive bandwidth adjustment, access control strategies for these adaptive rate services can effectively reduce call blocking and drop rates, thereby improving the resource utilization of 5G wireless communication systems and meeting the requirements of quality of service assurance.

[0009] This invention proposes a 5G wireless communication signal access control method based on intelligent multi-rate multi-service. It designs access control policy functions based on service category (e.g., video call, voice call) and connection request type (i.e., new request or handover request). By constructing an analysis model, it evaluates the performance of access control policies in 5G wireless communication systems with intelligent multi-rate services, and evaluates the system performance under the condition of actual application of access control policies. Summary of the Invention

[0010] The purpose of this invention is to provide a 5G wireless communication signal access control method based on intelligent multi-rate multi-service, in order to solve the problems mentioned in the background art, such as the lack of an access control strategy for adaptive processing of multiple services in 5G wireless communication systems and the inability to evaluate the access control strategy.

[0011] To achieve the above objectives, the present invention employs the following technical solution:

[0012] This invention proposes a 5G wireless communication signal access control method based on intelligent multi-rate multi-service, comprising the following steps:

[0013] S1. Construct a 5G wireless communication system model based on intelligent, multi-rate, and multi-service, and establish access control conditions for users to request new connections and request connections from new users within the coverage area.

[0014] S2. Design the access control policy function for the coverage area, using the CP policy function as the basis for the access control policy, ensuring that handover requests take precedence over new connection requests, and modeling the access control policy based on the access control conditions.

[0015] S3. Simulate the user's movement behavior in the 5G wireless communication system model and calculate the probability of the user connecting to or leaving the 5G wireless communication system during movement.

[0016] S4. Based on the user's mobile behavior, the coverage area occupancy status after being processed by the access control policy function evolves according to the multidimensional birth and death process of the coverage area, calculates the blocking probability and the dropping probability, and evaluates the access control policy function.

[0017] When the number of calls a base station can accept reaches its limit, the access control strategy adopts an intelligent variable rate method to segment the video call video portion, transmitting only the important parts of the image and reducing the image resolution, thereby increasing the number of calls.

[0018] Preferably, the 5G wireless communication system model based on intelligent multi-rate and multi-service is constructed in S1, as follows:

[0019] Set up the signal coverage area of ​​several 5G base stations as a cell , ≥4; Within the coverage area, the 5G wireless communication system provides two service types: single-mode service and dual-mode service. Dual-mode service includes dual-mode full-rate service and dual-mode reduced-rate service. User mobile devices with different service types can make new connection requests or handover connection requests.

[0020] Preferably, the access control conditions in S1 include the cell Do you accept different service types? There are six scenarios for making new connection requests and handover connection requests; details are as follows:

[0021] residential area The conditions under which China accepts new connection requests for "single-mode service" are:

[0022]

[0023] residential area The conditions under which a "single-mode service" handover connection request is accepted are as follows:

[0024]

[0025] residential area Conditions under which China accepts new connection requests for "Dual-Mode Full-Rate Service":

[0026]

[0027] residential area Conditions for accepting "Dual-Mode Full-Rate Service" handover connection requests:

[0028]

[0029] Receive "dual-mode full-rate service" from adjacent cells to the cell Conditions for handover connection requests in "Dual-mode rate reduction service":

[0030]

[0031] Accepting "dual-mode rate reduction service" from neighboring cells to the cell Conditions for handover connection requests in "Dual-mode rate reduction service":

[0032]

[0033] in, Indicates all currently The type of call service and the required connection capacity; the cell. Indicates the first The signal coverage area of ​​each base station; This indicates the bandwidth used by the "single-mode service". This indicates the bandwidth used by "dual-mode full-rate service"; Indicates the community The capacity; This represents the threshold for new connection requests; s This represents the threshold for handover connection requests.

[0034] Preferably, step S2 is as follows:

[0035] The cell capacity is The constraints for each basic bandwidth unit are as follows:

[0036]

[0037] in, Indicates all The type of call service and the amount of connection capacity required; Indicates the first The signal coverage area of ​​each base station and the total online capacity it can provide; This indicates that it represents the first type of call service (e.g., pure voice call on a single-mode service phone). This indicates the second type of call service (e.g., incomplete video call on a dual-mode rate-reduced service phone). This indicates the third type of call service (e.g., a full video call on a dual-mode full-rate service phone); Indicates the community The overall service occupancy vector; Indicate each service type The basic bandwidth unit;

[0038] Represents all The type of call service and the required connection capacity ( (), must be less than or equal to the first The signal coverage area of ​​each base station, and the total online capacity that can be provided ( );

[0039] At any given time, the community The service type is The number of connections is: For each community Service type s ∈S For new access requests and handover access requests, the access control policy is implemented through the policy function. and Perform modeling;

[0040] The priority of a handover access request must be higher than that of a new connection request, meaning the following conditions must be met:

[0041] ,

[0042] in, Indicates the community Types of services not accepted in China The new connection request strategy function; Indicates the community The service type from adjacent communities is not accepted. To service type The handover connection request strategy function;

[0043] Design the policy function using the CP policy function. and .

[0044] Furthermore, the policy function Modeling, specifically as follows:

[0045]

[0046] in, Indicates a single-mode service; Indicates dual-mode full-rate service; ψ This indicates the capacity to guarantee new call connection requests.

[0047] =1 indicates that when a service type A new connection request is attempting to access the cell. At that time, the CP strategy will reject new call connections;

[0048] =0 indicates that a service type A new connection request is attempting to access the cell. At that time, the CP strategy will approve the new call connection.

[0049] Furthermore, the policy function Modeling, when a service type A new connection request attempting to access the cell. At that time, the CP strategy will approve or reject the application based on the following conditions:

[0050]

[0051] in, Indicates a single-mode service. Indicates dual-mode full-rate service. This indicates a dual-mode reduced-rate service.

[0052] =1 indicates that when a service type A new connection request attempting to access the cell. At that time, the CP strategy will reject call connection requests for single-mode service, dual-mode full-rate service, and dual-mode reduced-rate service.

[0053] =0 indicates that a service type A new connection request attempting to access the cell. At that time, the CP strategy will approve the call connection request for single-mode service, dual-mode full-rate service, and dual-mode reduced-rate service.

[0054] Preferably, step S3 is as follows:

[0055] For different types of services, the community The channel hold time is defined as: ， The parameter for its holding time is: A user holding a connection of a certain service type has the probability of leaving or continuing to connect to the 5G wireless communication system when their channel hold time ends.

[0056] Probability of leaving the 5G wireless communication system The calculation formula is:

[0057]

[0058] The probability of continuing to move and connecting to neighboring cells The calculation formula is:

[0059]

[0060] in, Indicates from the community Switch to a nearby cell j Service types s The probability of a hand change attempt; This represents the remaining connection time, with an average value of [value missing]. ; Indicates the community The average cross-boundary time after a user enters the system is: .

[0061] Preferably, the evolution in S4 follows a multidimensional birth and death process, as follows:

[0062] User connection switching requests or new connection requests are being processed by the cell. Accepting this as a live event, the user terminates the connection or leaves the community. As a death event, we seek the birth rate and death rate in the process of birth and death;

[0063] residential area Medium service type The blocking probability of a new connection request is:

[0064]

[0065] residential area Medium service type The probability of dropping a handover connection request is:

[0066]

[0067] in, Indicates the community It is in a feasible state The probability of;

[0068] set up Indicates entering the community Previously based on service type Convert to service type The occurrence rate of handover connection requests is:

[0069]

[0070]

[0071]

[0072]

[0073]

[0074] in, ℜ represents the arrival rate of the new call after processing by the access control policy function; ∂ represents the arrival rate of the non-adaptive rate handover call after processing by the access control policy function; ∂ represents the arrival rate of the adaptive rate handover call after processing by the access control policy function. Indicates from neighboring cells j Service types Arrive at the community Service types t Turnover rate;

[0075] set up Indicating in relation to the community Service type in the corresponding birth and death process The mortality rate is:

[0076]

[0077] in, Indicates the community Medium service type The number of connections.

[0078] Preferably, the calculation of the blocking probability and the dropping probability in S4 is as follows:

[0079] Based on policy function and By iteratively solving the global equilibrium of the birth and death process, the corresponding blocking probability is obtained. and drop probability .

[0080] Preferably, the iterative solution to the global equilibrium of the birth-death process employs the following iterative fixed-point algorithm:

[0081] The first step is to consider all residential communities. Service type ,initialization =0, =0;

[0082] Step 2, if condition || ||+|| ||> e If true, then: solve for the turnover rate. ;

[0083] The third step is to calculate the birth rate. Blocking probability probability of dropping Then update: = , = ;

[0084] Return to step two until the calculation result meets the condition. ||+|| ||< e ;

[0085] Among them, || B || represents the sum of the absolute differences of all probability terms: Set tolerance e =10 -5 .

[0086] Compared with the prior art, the beneficial effects of the present invention are:

[0087] (1) The method in this invention establishes an access control strategy model under a multi-service 5G wireless communication system, analyzes the connection request arrival rate, departure rate, blocking probability and disconnection probability in the system, and verifies the effectiveness of the model through simulation experiments.

[0088] (2) Experiments show that the method in this invention can effectively reduce the probability of blocking and disconnection during user movement by using the adaptive mechanism of multi-rate service, thereby improving the system resource utilization and connection rate.

[0089] (3) The method in this invention verifies that mobile communication operators can use the access control strategy proposed in this invention to improve user experience and meet requirements when deploying intelligent multi-rate services. Attached Figure Description

[0090] Figure 1 This is a schematic diagram of the 5G wireless communication system model based on intelligent multi-rate multi-service in this invention. Detailed Implementation

[0091] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0092] Example 1:

[0093] Based on an intelligent, multi-rate, multi-service 5G wireless communication signal access control method, a model suitable for an intelligent, multi-rate, multi-service 5G wireless communication system is constructed. The designed access control strategy is used to analyze the blocking probability and dropout probability of connection requests. Specifically, the steps include:

[0094] Step 1: Construct a 5G wireless communication system model based on intelligent, variable-rate, and multi-service applications.

[0095] Figure 1 This invention demonstrates the architecture of an intelligent, multi-rate, multi-service 5G wireless communication system used in this invention. Handover occurs when users move between different cells. When studying call access control strategies, a general model of multi-service calls with mobility is considered, because most existing literature focuses on multi-category calls in fixed networks (i.e., without considering mobility) or only involves a single category of calls.

[0096] like Figure 1 As shown, assume there are four cells in the 5G wireless communication system, providing two types of call services. One is "single-mode service," which occupies a fixed and unadjustable bandwidth; the other is "dual-mode service," which has two modes: an unadjusted adaptive rate service, i.e., "dual-mode full-rate service," and an adjusted adaptive rate service, i.e., "dual-mode reduced-rate service."

[0097] The six conditions used in this invention summarize six common situations, as follows:

[0098] "Condition 1" means:

[0099] in, This indicates the bandwidth already used by cell 3. This indicates the connection request bandwidth for "single-mode service". This is the threshold for new connection requests. When "Condition 1" is met, connections from point [point name missing] are allowed in cell 3. K Time L Initiate a new "single-mode service" connection request.

[0100] “Condition 2” means:

[0101]

[0102] in, This indicates the bandwidth already used by cell 4. This represents the total bandwidth of cell 4. When condition 2 is met, traffic from point [point name missing] is allowed in cell 4. L Time M The "single-mode service" handover connection request. Meeting this condition increases the probability of blocking while reducing the probability of disconnection.

[0103] “Condition 3” means:

[0104]

[0105] Assumption =2, where This indicates the bandwidth already used by cell 2. This represents the connection request bandwidth for "dual-mode full-rate service". When "Condition 3" is met, connection from point [point name missing] in cell 2 is permitted. J Time D Initiate a new "dual-mode full-rate service" connection request. Similarly, point 1 in cell 1 also meets "condition 3". A Time B And from point 4 of the community A Time E The new "dual-mode full-rate service" connection request.

[0106] Condition 4 means:

[0107]

[0108] Assumption =2, where s This is the threshold for handover connection requests. When "Condition 4" is met, connection requests from point [point name missing] in cell 2 are allowed. B Time D Initiating a handover connection request for "dual-mode full-rate service". Similarly, point 1 in cell 1 also meets "condition 4". E Time F The "dual-mode full-rate service" handover connection request.

[0109] Condition 5 means:

[0110]

[0111] in, This represents the total bandwidth of cell 2. When condition 5 is met, the bandwidth of cell 1 located at point... F The "dual-mode full-rate service" was transferred to the midpoint of the second community. G The "dual-mode rate reduction service" allows for data transfer from points. F Time G The connection request for handover in Community 2. The location where the service type changes is point. C .

[0112] Condition 6 means:

[0113]

[0114] Assumption =2, and This indicates the connection request bandwidth for "dual-mode rate reduction service". When "Condition 6" is met, connection requests from the midpoint of cell 2 are permitted. I Time G The "dual-mode rate reduction service" handover connection request. Similarly, the connection from point in cell 1 also meets "condition 6". H Time IThe "dual-mode rate reduction service" handover connection request.

[0115] These conditions form the core of the call access control strategy, which aims to reduce the probability of blocking and dropped calls for various services simultaneously in a multi-service 5G wireless communication system.

[0116] Step 2: Design the access control strategy function.

[0117] The cell capacity is The constraints for Basic Bandwidth Units (BBUs) are as follows:

[0118]

[0119] in, Indicates all The type of call service and the amount of connection capacity required; Indicates the first The signal coverage area of ​​each base station and the total online capacity it can provide; This indicates the first type of call service; This indicates the second type of call service; This indicates the third type of call service; Indicates the community The overall service occupancy vector; Indicate each service type The basic bandwidth unit.

[0120] At any given time, the community The service type is s The number of connections is: For each community ∈{1,2,3,4}, for service type s∈S For new access requests and handover access requests, the access control policy (call access control) can be implemented through policy functions respectively. and Modeling is performed. Typically, the system prioritizes transfer requests from users because, for users, the sudden interruption of an ongoing connection is more frustrating than the occasional blocking of a new connection request. Therefore, transfer access requests must have higher priority than new connection requests, meaning the following conditions must be met:

[0121] ,

[0122] Existing technologies introduce the concept of policy functions and derive corresponding access control policy functions. Stevens-Navarro et al. pointed out in their literature that, under various connection request rates and different user mobility levels, simultaneously applying the Complete Partitioning (CP) policy in two access networks can achieve optimal performance in terms of design objectives. Therefore, this invention uses the CP policy function as the basis for the access control policy. This CP policy reserves a fixed number of available channels (i.e., BBUs) for handover requests. Next, using the notation of the policy function, when a service type is... s The connection request attempts to access the cell. At that time, for new users, the CP policy will reject them based on the following conditions:

[0123]

[0124] =1 indicates that when a service type A new connection request is attempting to access the cell. At that time, the CP strategy will reject new call connections;

[0125] =0 indicates that a service type A new connection request is attempting to access the cell. At that time, the CP strategy will approve the new call connection.

[0126] Furthermore, the rejection condition for users switching hands under the CP strategy is as follows:

[0127]

[0128] When it appears At this time, a hand-off dual-mode full-rate service call connection request will be transformed into a hand-off dual-mode reduced-speed service call connection request.

[0129] =1 indicates that when a service type A new connection request attempting to access the cell. At that time, the CP strategy will reject call connection requests for single-mode service, dual-mode full-rate service, and dual-mode slow-down service.

[0130] =0 indicates that a service type A new connection request attempting to access the cell. At that time, the CP strategy will approve the call connection requests for single-mode service, dual-mode full-rate service, and dual-mode slow-down service for the switch.

[0131] in, Indicates all currently The type of call service, the required connection capacity, and the integer parameters in equation (2) ψ The parameter σ in equation (3) is used to prioritize new connection requests, while the parameter σ in equation (3) is used to prioritize handover requests.

[0132] Step 3: Simulate user mobile behavior to build a traffic and mobility model.

[0133] This invention defines inter-cell boundary time to simulate user movement behavior. "Inter-cell boundary time" refers to the time interval between two adjacent cell boundaries experienced by a mobile user. This time depends on the cell size and the user's movement pattern. If an inter-cell boundary time is defined from the time the user enters the cell... The calculation begins from that moment, and it is denoted as... Assuming It is a random variable that follows an exponential distribution with a mean of . . Figure 1 This time period was displayed. That is, the boundary intersection point N and C The time between. In the community. The channel holding time is defined as the time during which a connected mobile user continues to occupy resources (represented by Basic Bandwidth Units, BBUs) in a cell.

[0134] For different types of services, the community The channel hold time is defined as: ， in and For all They all follow an exponential distribution, and the parameter for their retention time is: In the community In 5G wireless communication, a mobile user holding a connection of a certain service type has a probability of leaving the system at the end of their channel hold-time. The probability is calculated using the following formula: At the same time, this user also has a probability. It continues to move within the system and connects to neighboring cells.

[0135]

[0136] in, Indicates from the community Switch to a nearby cell j Service types s The probability of attempting to switch hands.

[0137] Step 4: Calculate the blocking probability and the drop probability based on the evolution of the cell occupancy status.

[0138] If the occupancy vector Meets all service types have If a vector is feasible and satisfies the constraints in equation (1), then the vector is considered feasible. This invention uses... Indicates all feasible A set of vectors. (Community) The occupancy status evolves according to a multidimensional birth and death process. A birth event occurs when a connection request from a new or transferred user is triggered by the cell. Accepted; Dead events occur when a user terminates the connection or leaves the cell. At that time. Let's assume... Indicates the community In state The probability of.

[0139] residential area In the middle, service type s The probability of a new user connection request being blocked is:

[0140]

[0141] Service Types t The probability of dropping user connection requests during the handover process is:

[0142]

[0143] make Indicates entering the community Previously, based on service type s Convert to service type t The generation rate of connection requests is:

[0144]

[0145] in

[0146]

[0147]

[0148]

[0149]

[0150] in, Indicates from neighboring cells j Service types s Transfer to the community Service types tThe handover rate.

[0151] set up Indicating in relation to the community In the corresponding process of birth and death, service type s The death rate. A death event refers to a user terminating their connection or leaving the cell. The events that occurred at that time.

[0152]

[0153] Given a policy function , and network parameters , , , , , and (For all communities) ∈M Service type s∈S This allows us to solve the global equilibrium equations for the birth-death process, and thus obtain the corresponding blocking probabilities. and drop probability In order to calculate the production rate in equation (7), it is necessary to first solve the turnover rate equation (11).

[0154] To calculate the blocking and dropping probabilities of connection requests from new users and repeating users, the following iterative fixed-point algorithm is used:

[0155] First, for all communities Service type ,initialization =0, =0. If condition|| ||+|| ||> e If true, then: solve the turnover rate equation (11); calculate the production rate. Blocking probability probability of dropping Then update: = , = Return to step 2 until the calculation result meets the condition. ||+|| ||< e Among them, || B || represents the sum of the absolute differences of all probability terms: The tolerance set in this invention e =10-5 .

[0156] When the number of calls a base station can accept reaches its limit, the access control strategy adopts an intelligent variable rate method to segment the video call video portion, transmitting only the important parts of the image and reducing the image resolution, thereby increasing the number of calls.

[0157] The meanings of the parameters involved in all formulas in this invention are shown in Table 1.

[0158] Table 1. Symbols and their definitions used.

[0159]

[0160] This invention supports diverse service categories with different bandwidth requirements, supports bandwidth adaptive function for call services, and evaluates the application effect of access control strategies in wireless access networks. By analyzing the connection request arrival rate, departure rate, blocking probability, and drop probability in the system, it evaluates the impact of adopting a bandwidth adaptive access control strategy in wireless access networks on call services, and evaluates the performance of the strategy based on connection request arrival rate in 5G wireless communication systems.

[0161] The above description is only for the purpose of helping to understand the method and core essence of the present invention, but the scope of protection of the present invention is not limited thereto. For those skilled in the art, any equivalent substitutions or modifications made to the technical solution and inventive concept disclosed in the present invention within the scope of the technology disclosed in the present invention should be covered within the scope of protection of the present invention. Therefore, the content of this specification should not be construed as a limitation of the present invention.

Claims

1. A 5G wireless communication signal access control method based on intelligent multi-rate multi-service, characterized in that, Includes the following steps: S1. Construct a 5G wireless communication system model based on intelligent, multi-rate, and multi-service, and establish access control conditions for users to request new connections and request connections from new users within the coverage area. S2. Design the access control policy function for the coverage area, using the CP policy function as the basis for the access control policy, ensuring that handover requests take precedence over new connection requests, and modeling the access control policy based on the access control conditions. S2 is specifically as follows: The cell capacity is The constraints for the basic bandwidth unit are as follows: in, Indicates all The type of call service and the amount of connection capacity required; Indicates the first The signal coverage area of ​​each base station and the total online capacity it can provide; This indicates the first type of call service; This indicates the second type of call service; This indicates the third type of call service; Indicates the community The overall service occupancy vector; Indicate each service type The basic bandwidth unit; At any given time, the community The service type is The number of connections is: For each community Service type s∈S For new access requests and handover access requests, the access control policy is implemented through the policy function. and Perform modeling; The priority of a handover access request must be higher than that of a new connection request, meaning the following conditions must be met: in, Indicates the community Types of services not accepted in China The new connection request strategy function; Indicates the community The service type from adjacent communities is not accepted. To service type The handover connection request strategy function; Design the policy function using the CP policy function. and ; The strategy function Modeling, when a service type A new connection request attempting to access the cell. At that time, the CP strategy will approve or reject the application based on the following conditions: in, Indicates a single-mode service; Indicates dual-mode full-rate service; ψ This indicates the capacity to guarantee new call connection requests; =1 indicates that when a service type A new connection request is attempting to access the cell. At that time, the CP strategy will reject new call connections; =0 indicates that a service type A new connection request is attempting to access the cell. At that time, the CP strategy will approve the new call connection; The strategy function Modeling, specifically as follows: in, Indicates a single-mode service. Indicates dual-mode full-rate service. This indicates a dual-mode reduced-rate service. =1 indicates that when a service type A new connection request attempting to access the cell. At that time, the CP strategy will reject call connection requests for single-mode service, dual-mode full-rate service, and dual-mode reduced-rate service. =0 indicates that a service type A new connection request attempting to access the cell. At that time, the CP strategy will approve the call connection request for single-mode service, dual-mode full-rate service and dual-mode reduced-rate service for the handover; S3. Simulate the user's movement behavior in the 5G wireless communication system model and calculate the probability of the user connecting to or leaving the 5G wireless communication system during movement. S4. Based on the user's mobile behavior, the coverage area occupancy status after being processed by the access control policy function evolves according to the multidimensional birth and death process of the coverage area, calculates the blocking probability and the drop probability, and evaluates the access control policy function.

2. The 5G wireless communication signal access control method based on intelligent multi-rate multi-service as described in claim 1, characterized in that, The S1 section describes the construction of a 5G wireless communication system model based on intelligent multi-rate and multi-service architecture, as detailed below: Set up the signal coverage area of ​​several 5G base stations as a cell , ≥4; Within the coverage area, the 5G wireless communication system provides two service types: single-mode service and dual-mode service. Dual-mode service includes dual-mode full-rate service and dual-mode reduced-rate service. User mobile devices with different service types can make new connection requests or handover connection requests.

3. The 5G wireless communication signal access control method based on intelligent multi-rate multi-service as described in claim 2, characterized in that, The access control conditions in S1 include the cell Do you accept different service types? There are six scenarios for making new connection requests and handover connection requests; details are as follows: residential area The conditions under which a new connection request for a "single-mode service" is accepted are: residential area The conditions under which a "single-mode service" handover connection request is accepted are as follows: residential area Conditions under which China accepts new connection requests for "dual-mode full-rate service": residential area Conditions for accepting "Dual-Mode Full-Rate Service" handover connection requests: Receive "dual-mode full-rate service" from neighboring cells to the cell Conditions for handover connection requests in "Dual-mode rate reduction service": Receive "dual-mode rate reduction service" from neighboring cells to the cell Conditions for handover connection requests in "Dual-mode rate reduction service": in, Indicates all currently The type of call service and the required connection capacity; the cell. Indicates the first The signal coverage area of ​​each base station; This indicates the bandwidth used by "single-mode service". This indicates the bandwidth used by "Dual-Mode Full-Rate Service". This indicates the bandwidth used by the "dual-mode rate reduction service"; Indicates the community The capacity; This represents the threshold for new connection requests; σ This represents the threshold for handover connection requests.

4. The 5G wireless communication signal access control method based on intelligent multi-rate multi-service as described in any one of claims 1-3, characterized in that, S3 is specifically as follows: For different types of services, the community The channel hold time is defined as: ， The parameter for its holding time is: A user holding a connection of a certain service type has the probability of leaving or continuing to connect to the 5G wireless communication system when their channel hold time ends. Probability of leaving the 5G wireless communication system The calculation formula is: The probability of continuing to move and connecting to neighboring cells The calculation formula is: in, Indicates from the community Switch to a nearby cell j Service types s The probability of a hand change attempt; This represents the remaining connection time, with an average value of [value missing]. ; Indicates the community The average cross-boundary time after a user enters the system is: .

5. The 5G wireless communication signal access control method based on intelligent multi-rate multi-service as described in claim 4, characterized in that, The evolution of S4 follows a multidimensional birth-death process, as detailed below: User connection switching requests or new connection requests are being processed by the cell. Accepting this as a live event, the user terminates the connection or leaves the community. As a death event, we seek the birth rate and death rate in the process of birth and death; residential area Medium service type The blocking probability of a new connection request is: residential area Medium service type The probability of dropping a handover connection request is: in, Indicates the community It is in a feasible state The probability of; set up Indicates entering the community Previously based on service type Convert to service type The occurrence rate of handover connection requests is: in, This indicates the arrival rate of new calls after processing by the access control policy function; This represents the arrival rate of non-adaptive rate handover calls after processing by the access control policy function; This represents the arrival rate of the adaptive rate handover call after processing by the access control policy function; Indicates from neighboring cells j Service types Arrive at the community Service types t Turnover rate; set up Indicating in relation to the community Service type in the corresponding birth and death process The mortality rate is: in, Indicates the community Medium service type The number of connections.

6. The 5G wireless communication signal access control method based on intelligent multi-rate multi-service as described in claim 5, characterized in that, In step S4, the blocking probability and the discard probability are calculated as follows: Based on policy function and By iteratively solving the global equilibrium of the birth and death process, the corresponding blocking probability is obtained. and drop probability .

7. The 5G wireless communication signal access control method based on intelligent multi-rate multi-service as described in claim 6, characterized in that, The global equilibrium of the birth-death process is solved iteratively using the following iterative fixed-point algorithm: The first step is to consider all residential communities. Service type ,initialization =0, =0; Step 2, if condition || ||+|| ||> ε If true, then: solve for the turnover rate. ; The third step is to calculate the birth rate. Blocking probability probability of dropping Then update: = , = ; Return to step two until the calculation result meets the condition. ||+|| ||< ε ; Among them, || B || represents the sum of the absolute differences of all probability terms: Set tolerance ε =10 -5 .

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