CN121001137A - A 5G wireless communication signal access control method based on intelligent multi-rate and multi-service - Google Patents
A 5G wireless communication signal access control method based on intelligent multi-rate and multi-serviceInfo
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Abstract
本发明公开了基于智能多变率多业务的5G无线通信讯号接入控制方法，涉及5G无线通信连接接入控制技术领域；该方法包括如下步骤：构建基于智能多变率多元业务的5G无线通信系统模型，建立用户在覆盖区域内的接入控制条件；设计覆盖区域的接入控制策略函数，采用CP策略函数作为接入控制策略基础，基于接入控制条件对接入控制策略建模；模拟用户在5G无线通信系统模型中的移动行为，计算用户5G无线通信讯号变化概率；将经过接入控制策略函数处理后的覆盖区域占用状态按照覆盖区域的多维生灭过程演变，计算阻塞概率与丢弃概率。本发明通过多变率服务的自适应机制，可在用户移动过程中有效降低阻塞与掉线概率，从而提升系统资源利用率与连接率。
This invention discloses a 5G wireless communication signal access control method based on intelligent multi-rate multi-service, relating to the field of 5G wireless communication connection access control technology. The method includes the following steps: constructing a 5G wireless communication system model based on intelligent multi-rate multi-service, and establishing access control conditions for users within the coverage area; designing an access control policy function for the coverage area, using a CP policy function as the basis for the access control policy, and modeling the access control policy based on the access control conditions; simulating user movement behavior in the 5G wireless communication system model and calculating the probability of changes in the user's 5G wireless communication signal; and calculating the blocking probability and drop probability by analyzing the coverage area occupancy state after processing by the access control policy function according to the multi-dimensional birth and death process of the coverage area. This invention, through an adaptive mechanism of multi-rate services, can effectively reduce the probability of blocking and dropped connections during user movement, thereby improving system resource utilization and connectivity.
Description
Technical Field
The invention belongs to the technical field of 5G wireless communication connection access control, and particularly relates to a 5G wireless communication signal access control method based on intelligent multiple-variable-rate multiple services.
Background
The 5G wireless communication system provides wide area network coverage and a user may switch connections between different 5G wireless communication systems according to their roaming agreements as they move within the coverage area, a process known as handoff. The evolution of 5G wireless communication systems has spawned a strong demand for multimedia services with quality of service guarantees. Connection access control mechanisms are widely used in 5G wireless communication networks to selectively limit the number of various types of traffic access calls to maximize network resource utilization while meeting constraints. In 5G wireless communication systems, the requirements of different services (e.g. voice, real-time video) for quality of service are different, so the number of connections in each access network must be controlled by an access control policy. The role of the access control policy is to decide, upon receipt of a connection request, whether to accept the connection and allocate resources, or to reject the connection request directly. Typically, the system will give priority to connection requests from the handoff user rather than newly initiated connection requests. From a user experience point of view, a sudden break of a connection is less desirable than a new connection being blocked occasionally.
Standard connection access control mechanisms include Guard Channel (GC), queuing Priority (QP), cut-off Priority (CP), fractional Guard Channel (Fractional Guard Channel, FG), and multiple threshold mechanisms. Most studies only consider a single traffic type, defaulting to all incoming connection requests occupying the same bandwidth. Thus, some researchers have proposed multi-service access control policy mechanisms for multi-service wireless networks, such as Chao and Chen, stratogiannis et al and Stevens-Navarro et al.
Chao and Chen have studied the problem of access control in mobile personal communication networks, focusing on discussing multiple types of call access control where the user has mobility. They propose and analyze a generic class of coordinate (coordinate-convex) access control policies. Stratogiannis et al developed a scheme to gradually suppress the new call access rate for each traffic class (SERVICE CLASS, SC) and process it independently according to the priority of each traffic. The scheme performs performance analysis under the general conditions of single service and multi-service. Stevens-Navarro et al expands the CP and FG policies and evaluates four different access control policy combinations by introducing policy functions. They found that when both access networks employ CP policies, the system performance is optimal under different connection request rates and user mobility conditions. The CP policy reserves a fixed number of channels for the handoff user and if there are no unreserved channels, the connection request of the new user will be blocked. The policy evaluates network performance by analyzing the blocking rate and dropping rate of new calls and handoff calls.
The above-mentioned existing research on access control strategies in terms of call blocking and dropped calls has mostly not considered adaptive processing of multiple traffic in 5G wireless communication systems. Current mobile 5G wireless communication systems have been able to support a variety of call services, such as voice and video calls, but the bandwidth requirements for these services are typically fixed. If the bandwidths of the services can be flexibly adjusted, the access control policy mechanism adopted by the services based on the intelligent multiple variability rate can obviously reduce the call blocking rate and the disconnection rate, thereby improving the resource utilization rate of the 5G wireless communication system and meeting the guarantee. With respect to flexible adjustment of call service bandwidth, intelligent multiple variability is enabled using a novel and flexible implementation. For example, the speech coding standard g.722 supports dynamic adjustment of bandwidth, and Multiple Description Coding (MDC) techniques in video coding can also flexibly control the bandwidth requirements of video services.
The speech coder is a fourth speech compression standard established by the European Telecommunication Standardization Institute (ETSI). The speech compression algorithm is consistent with the GSM and WCDMA systems, and can reduce the encoding rate of the source speech from 12.2 kb/s to the lowest 4.75 kb/s. In global system for mobile communications (GSM), intelligent multi-rate has two voice channel modes, intelligent full-rate and intelligent half-rate. Wherein the total bit rate of the intelligent full rate is 22.8 kb/s, and the total bit rate of the intelligent half rate is 11.4 kb/s. This "total bit rate" refers to the sum of the bit rate of the speech encoder and the bit rate of the channel encoder. A mobile terminal equipped with an intelligent multi-rate encoder may request the use of a particular transmission mode.
Intelligent multi-rate video coding splits a single media stream into multiple sub-streams (n≥2), each of which is called a "description". These described packets may be transmitted over multiple paths. MDC is essentially a data splitting technique that has been applied to standards such as MPEG-2 and MPEG-4. In the present invention, a single video media stream is split into two sub-streams, each as a different description of multiple description coding.
The intelligent multi-rate broadband encoder can be used for bandwidth adaptation of voice services and can realize bandwidth adaptation of video services. If the voice and video call services support the self-adaptive adjustment of the bandwidth, the access control strategy aiming at the self-adaptive rate services can effectively reduce the blocking rate and the disconnection rate of the call, thereby improving the resource utilization rate of the 5G wireless communication system and meeting the requirements of service quality guarantee.
The invention provides a 5G wireless communication signal access control method based on intelligent multiple-variability multiple-service, which designs an access control strategy function based on service types (such as video call and voice call) and connection request types (namely new request or handoff request), and is used for evaluating the performance of the access control strategy in a 5G wireless communication system with the intelligent multiple-variability service by constructing an analysis model and evaluating the system performance under the condition of actually applying the access control strategy.
Disclosure of Invention
The invention aims to provide a 5G wireless communication signal access control method based on intelligent multiple-variable-rate multiple services, so as to solve the problems that the prior method provided in the background art lacks an access control strategy for adaptive processing of multiple services in a 5G wireless communication system, and cannot evaluate the access control strategy.
In order to achieve the above purpose, the invention adopts the following technical scheme:
The invention provides a 5G wireless communication signal access control method based on intelligent multiple variable rate multiple services, which comprises the following steps:
s1, constructing a 5G wireless communication system model based on intelligent multi-rate multi-element service, and establishing access control conditions of new connection request connection and handoff request connection of a user in a coverage area;
S2, designing an access control strategy function of a coverage area, adopting a CP strategy function as an access control strategy base, ensuring that a handoff request takes precedence over a new connection request, and modeling the access control strategy based on access control conditions;
S3, simulating the movement behavior of the user in the 5G wireless communication system model, and calculating the probability of the user connecting or leaving the 5G wireless communication system in the movement process;
s4, combining the mobile behaviors of the users, evolving the occupied state of the coverage area processed by the access control strategy function according to the multidimensional vanishing process of the coverage area, calculating the blocking probability and the discarding probability, and evaluating the access control strategy function;
When the number of call connection acceptable by the base station reaches the upper limit, the access control strategy adopts an intelligent multi-transformation method, so that the image part of the video call is divided by the image, only important parts of the transmitted image are transmitted, the resolution of the image is reduced, and the number of call connection is further increased.
Preferably, in the step S1, a 5G wireless communication system model based on intelligent multi-rate multi-element service is constructed, which specifically includes the following steps:
setting signal coverage areas of a plurality of 5G base stations as cells ,And providing two service types, namely single-mode service and dual-mode service in the coverage area, wherein the dual-mode service comprises dual-mode full-rate service and dual-mode reduced-rate service, and the user mobile equipment with different service types performs new connection request or handoff connection request.
Preferably, the access control conditions in S1 include a cellWhether or not to accept different service typesSix cases of new connection request and handoff connection request are performed, specifically as follows:
Cell The conditions for accepting the new connection request of the single mode service are as follows:
Cell The conditions for accepting the "single mode service" handoff connection request are:
Cell Conditions for accepting a new connection request of "dual mode full rate service":
Cell Conditions for accepting a "dual mode full rate service" handoff connection request:
accepting "dual mode full rate service" from neighbor cells to cells Conditions for handoff connection request in "dual mode reduced rate service":
accepting "dual mode reduced rate service" from neighboring cells to cells Conditions for handoff connection request in "dual mode reduced rate service":
Wherein, the Representing the current totalityThe cell is used for receiving call service type and the online capacity needed to be occupiedRepresent the firstSignal coverage of each base station; Representing the bandwidth occupied by "single mode services", Representing the bandwidth occupied by a "dual mode full rate service"; Representing cells Is a capacity of (2); Representing the threshold for new connection requests and sigma representing the threshold for handoff connection requests.
Preferably, the S2 is specifically as follows:
The cell capacity is The constraint requirements for the individual basic bandwidth units are as follows:
Wherein, the Representing allThe call service type is selected, and the online capacity is required to be occupied; Represent the first Signal coverage of each base station, total connection capacity available; Representing the type of call service representing the 1 st (e.g., voice only call for a single mode service handset); indicating the type of 2 call services (e.g., incomplete video call of dual mode reduced rate service handset); Indicating the 3 rd call service type (e.g., full video call for dual mode full rate service handset); Representing cells Occupancy vector of the overall service; Representing each service type Is a basic bandwidth unit of (1);
Representing all The call service type is classified, and the online capacity to be occupied is #) Must be less than or equal to the firstSignal coverage of each base station, total connection capacity which can be provided);
At any time, a cellThe medium service type isThe number of connections is: For each cell New access request and handoff access request of service type S epsilon S, access control strategy is respectively passed through strategy functionAndModeling is carried out;
The handoff access request must have a higher priority than the new connection request, i.e. the following conditions should be met:
,
Wherein, the Representing cellsType of service not accepted in (b)A new connection request policy function; Representing cells Not accepting service types from neighboring cellsTo service typeA handoff connection request policy function;
Design of policy functions using CP policy functions And。
Further, the policy functionModeling is specifically as follows:
Wherein, the Representing a single mode service; Indicating a dual mode full rate service and ψ indicates the capacity to guarantee new call connection requests.
When=1, it means that when a service typeAttempting to access the cellWhen the CP strategy refuses to connect the new call;
When=0, it means that when one service type Attempting to access the cellThe CP policy will then approve the new call connection.
Further, the policy functionModeling, when a service typeAttempting to access the cellWhen the CP policy passes or refuses, the CP policy is passed or refused according to the following conditions:
Wherein, the A single-mode service is represented and,Representing a dual mode full rate service,Representing a dual mode reduced rate service;
=1, indicating when a service type Attempting to access the cellWhen the call connection request is received, the CP strategy refuses the single-mode service, the dual-mode full-rate service and the dual-mode reduced-rate service of the handoff;
=0, indicating when a service type Attempting to access the cellAt this time, the CP policy may approve the handoff of the single mode service, the dual mode full rate service, and the dual mode reduced rate service call connection request.
Preferably, the S3 is specifically as follows:
For different types of services, cells The channel hold time in (a) is defined as: The parameters of the holding time are: a user holding a connection of a certain type of service, the user having a probability of leaving or continuing to connect to the 5G wireless communication system at the end of its channel hold time;
Probability of leaving 5G wireless communication system The calculation formula is as follows:
Probability of continuing to move and connect to neighboring cells The calculation formula is as follows:
Wherein, the Representing a slave cellA probability of handoff attempt to a service type s of a neighboring cell j; indicating the remaining connection time, the average value is ;Representing cellsThe cross-boundary time after the user enters is as follows, the average value is。
Preferably, in S4, the evolution is performed according to a multidimensional vanishing process, specifically as follows:
User handoff connection request or new connection request is cell Accepting as a life event, the user terminating the connection or leaving the cellAs a dead event, calculating the birth rate and the death rate in the process of birth and death;
Cell Type of medium serviceThe blocking probability of new connection requests is:
Cell Type of medium serviceThe drop probability of the handoff connection request is:
Wherein, the Representing cellsIn a viable stateProbability of (2);
Is provided with Indicating entry into a cellPreviously from service typeSwitching to service typeThe generation rate of the handoff connection request is as follows:
Wherein, the R represents the arrival rate of the non-adaptive rate handoff call processed by the access control strategy function, ∂ represents the arrival rate of the adaptive rate handoff call processed by the access control strategy function; representing the type of service in a secondary neighbor cell j To cellA handoff rate of service type t;
Is provided with Indicated in the associated cellCorresponding service type in life-to-life processMortality of (2) is:
Wherein, the Representing cellsType of medium serviceIs a number of connections.
Preferably, the blocking probability and the discarding probability are calculated in S4 as follows:
Based on a policy function AndObtaining corresponding blocking probability by iteratively solving global balance of the living and extinguishing processAnd drop probability。
Preferably, the global balance of the process of solving the living and extinguishing through iteration adopts the following iterative dead point algorithm:
first step, for all cells And service typeInitializing=0,=0;
Second, if the condition is |||+||If | > ε is true, then solve for the handoff rate;
Third, calculating the yieldProbability of blockingProbability of discardThen updating:=,=;
Returning to the second step until the calculation result meets the condition ||+||||<ε;
Wherein, the |b|| represents the sum of absolute value differences of all probability terms: the tolerance epsilon=10 -5 is set.
Compared with the prior art, the invention has the beneficial effects that:
(1) The method establishes an access control strategy model under the multi-element service 5G wireless communication system, analyzes the arrival rate, the departure rate, the blocking probability and the disconnection probability of the connection request in the system, and verifies the effectiveness of the model through simulation experiments.
(2) Experiments show that the method can effectively reduce blocking and disconnection probability in the moving process of the user through the self-adaptive mechanism of the multi-rate service, thereby improving the utilization rate and the connection rate of system resources.
(3) The method verifies that the mobile communication operator can utilize the access control strategy provided by the invention to improve the user experience and meet the requirements under the condition of deploying the intelligent multiple-change-rate service.
Drawings
Fig. 1 is a schematic diagram of a 5G wireless communication system model based on intelligent multi-rate and multi-element service in the present invention.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
Example 1:
A5G wireless communication signal access control method based on intelligent multiple-variable-rate multiple-service is used for constructing a model applicable to an intelligent multiple-variable-rate multiple-service 5G wireless communication system, and the designed access control strategy is adopted for analyzing the blocking probability and the disconnection probability of a connection request. The method specifically comprises the following steps:
Step one, constructing a 5G wireless communication system model based on intelligent multiple-variability multi-element service.
Fig. 1 illustrates the architecture of an intelligent multiple-variability multi-component service 5G wireless communication system used in the present invention. The user may handoff when moving between different cells, and when studying call access control policies, the general model of multi-service calls with mobility is considered, as most existing literature is concerned with multi-class calls in fixed networks (i.e. mobility is not considered), or calls involving only a single class.
As shown in fig. 1, it is assumed that there are four cells in total in the 5G wireless communication system, and two call services are provided. One of which is a "single mode service" which occupies a fixed and non-adjustable bandwidth, and the other is a "dual mode service" which has two modes, one being an unadjusted adaptive rate service, i.e. "dual mode full rate service", and the other being an adjusted adaptive rate service, i.e. "dual mode reduced rate service".
The six conditions used in the present invention summarize the six general cases, which are specifically as follows:
"condition 1" means:
Wherein, the Indicating the bandwidth already occupied by the cell 3,Representing the connection request bandwidth of "single mode service",Is the threshold for new connection requests. When "condition 1" is satisfied, a new "single mode service" connection request is allowed to be initiated in cell 3 from point K to point L.
"Condition 2" means:
Wherein, the Indicating the bandwidth already occupied by the cell 4,Representing the total bandwidth of cell 4. When "condition 2" is satisfied, a "single mode service" handoff connection request from point L to point M in cell 4 is allowed. Meeting this condition increases the blocking probability while reducing the drop probability.
"Condition 3" means:
Assume that =2, WhereinIndicating the bandwidth already occupied by cell 2,Representing the connection request bandwidth of the "dual mode full rate service". When "condition 3" is satisfied, a new "dual mode full rate service" connection request is allowed to be initiated in cell 2 from point J to point D. Also, the "condition 3" is satisfied with the new "dual mode full rate service" connection request from point a to point B in cell 1 and from point a to point E in cell 4.
"Condition 4" means:
Assume that =2, Where σ is the threshold for handoff connection requests. When "condition 4" is satisfied, a handoff connection request of "dual mode full rate service" is allowed to be initiated in cell 2 from point B to point D. Also, the "dual mode full rate service" handoff connection request from point E to point F in cell 1 is satisfied for "condition 4".
"Condition 5" means:
Wherein, the Representing the total bandwidth of cell 2. When "condition 5" is satisfied, the "dual mode full rate service" handoff in cell 1 at point F is a "dual mode reduced rate service" for point G in cell 2 and cell 2 handoff connection request from point F to point G is allowed. The location of the service type change is point C.
"Condition 6" means:
Assume that =2, AndRepresenting the connection request bandwidth of the "dual mode reduced rate service". When "condition 6" is satisfied, a "dual mode reduced rate service" handoff connection request from point I to point G in cell 2 is allowed. Also, the "dual mode reduced rate service" handoff connection request from point H to point I in cell 1 is satisfied for "condition 6".
These conditions form the core of a call access control strategy, and the aim is to reduce the blocking probability and the disconnection probability of various services in a multi-service 5G wireless communication system.
Step two, designing an access control strategy function.
The cell capacity isThe constraint requirements of the Basic Bandwidth Unit (BBUs) are as follows:
Wherein, the Representing allThe call service type is selected, and the online capacity is required to be occupied; Represent the first Signal coverage of each base station, total connection capacity available; Representing the type 1 call service; representing the type 2 call service; representing the 3 rd call service type; Representing cells Occupancy vector of the overall service; Representing each service type Is used for the basic bandwidth unit of (a).
At any time, a cellThe number of connections with the service type s is: for each cell E {1,2,3,4}, access control policies (call access control) may be passed through policy functions for new access requests and handoff access requests of service type S e S, respectivelyAndModeling is performed. Typically, the system will give the request of the handoff user a higher priority because it is less desirable for the user that the ongoing connection be suddenly interrupted than if a new connection request were blocked at once. Therefore, the handoff access request must have a higher priority than the new connection request, i.e. the following condition should be satisfied:
,
The prior art introduces the concept of policy functions and derives the corresponding access control policy functions. Stevens-Navarro et al, in the literature, state that applying a full share priority (Complete Partitioning, CP) policy in two access networks simultaneously at multiple connection request rates and different user mobility levels can achieve optimal performance on design goals. Therefore, the present invention adopts the CP policy function as the basis of the access control policy. The CP policy reserves a fixed number of available channels (i.e., BBUs) for handoff requests. Next, by means of the notation of the policy function, when a connection request of service type s attempts to access the cell When a new user is identified, the CP policy is rejected according to the following conditions:
When=1, it means that when a service type Attempting to access the cellWhen the CP strategy refuses to connect the new call;
When=0, it means that when one service type Attempting to access the cellThe CP policy will then approve the new call connection.
And the rejection condition of the CP policy to the handoff user is:
When it occurs When the hand-off dual-mode full-rate service call connection request is received, the hand-off dual-mode full-rate service call connection request is converted into the hand-off dual-mode deceleration service call connection request.
=1, Indicating when a service typeAttempting to access the cellWhen the call connection request is received, the CP strategy refuses the single-mode service, the dual-mode full-rate service and the dual-mode deceleration service of the handoff;
=0, indicating when a service type Attempting to access the cellAt this time, the CP policy may approve the single mode service, the dual mode full rate service, and the dual mode reduced rate service call connection request for the handoff.
Wherein, the Representing the current totalityThe call service type, the online capacity that needs to be occupied, the integer parameter ψ in equation (2) is used to guarantee the new connection request preferentially, and the parameter σ in equation (3) is used to guarantee the handoff request preferentially.
And thirdly, simulating the movement behavior of the user to construct a flow and mobility model.
The invention defines inter-cell boundary time to simulate the movement behavior of the user. By "inter-boundary time" is meant the time interval that elapses between one mobile user crossing the boundary between two adjacent cells. The time depends on the size of the cell and the movement pattern of the user. If an inter-boundary time from a user enters a cellIs calculated at the moment in time of starting the calculation, it is noted as. Assume thatIs a random variable obeying the exponential distribution, the average value is. FIG. 1 illustrates this time periodI.e. the time between boundary intersections N and C. In a cellThe channel hold time (channelholdingtime) in (a) is defined as the time during which a connected mobile subscriber continues to occupy resources (represented by basic bandwidth unit BBUs) in the cell.
For different types of services, cellsThe channel hold time in (a) is defined as: Wherein AndFor all ofAll obey an exponential distribution, the parameters of which hold time are: . In a cell In the method, when a mobile user holding a certain service type connection is over the channel holding time, the existence probability leaves the 5G wireless communication system, and the probability calculation formula is as follows: . At the same time, the user has probability Continue to move in the system and connect to neighboring cells.
Wherein, the Representing a slave cellProbability of handoff attempt to service type s of neighboring cell j.
And step four, calculating blocking probability and discarding probability based on the evolution of the cell occupation state.
If the vector is occupiedSatisfy all service typesHas the following componentsAnd satisfies the constraint in equation (1), then the vector is said to be viable. For the inventionRepresenting all feasibleA set of vectors. CellThe occupancy state of (2) evolves according to a multidimensional vanishing procedure. The event occurs in a connection request by cell from a handoff user or a new userUpon acceptance, a dead event occurs when the user terminates the connection or leaves the cellWhen (1). Is provided withRepresenting cellsIn a state ofIs a probability of (2).
CellIn the new user connection request blocking probability of the service type s is:
the handoff user connection request discarding probability of the service type t is:
Order the Indicating entry into a cellThe generation rate of the connection request from the service type s to the service type t is as follows:
Wherein the method comprises the steps of
Wherein, the Indicating a handoff to a cell from a service type s in a neighboring cell jHandoff rate (handoverrate) for service type t.
Is provided withIndicated in the associated cellMortality of the service type s in the corresponding birth and death process (deathrate). The death event refers to the user terminating the connection or leaving the cellEvents that occur at the time.
Given a policy function,Network parameters、、、、、And(For all cells)E M, service type S e S), the global equilibrium equation of the birth-and-death process can be solved, and the corresponding blocking probability is obtainedAnd drop probability. To calculate the yield in equation (7), the handoff rate equation (11) needs to be solved first.
To calculate the blocking and dropping probabilities of connection requests from new users and handoff users, the following iterative dead point algorithm is used:
First, for all cells And service typeInitializing=0,=0. If the condition is |||+||If epsilon is satisfied, solving a hand-over rate equation (11), and calculating the birth rateProbability of blockingProbability of discardThen updating:=,= Returning to the step 2 until the calculation result meets the condition|| ||+|||| < Epsilon. Where B represents the sum of absolute differences of all probability terms: . The tolerance epsilon=10 -5 set in the present invention.
When the number of call connection acceptable by the base station reaches the upper limit, the access control strategy adopts an intelligent multi-transformation method, so that the image part of the video call is divided by the image, only important parts of the transmitted image are transmitted, the resolution of the image is reduced, and the number of call connection is further increased.
The meanings of the parameters involved in all the formulas in the present invention are shown in table 1.
The symbols used in Table 1 and their definitions
The invention supports multiple business types with different bandwidth demands, supports the bandwidth self-adapting function of call service, evaluates the application effect of access control strategy in wireless access network, evaluates the influence of access control strategy supporting bandwidth self-adapting on call service in wireless access network by analyzing the arrival rate, departure rate, blocking probability and disconnection probability of connection request in the system, and evaluates the performance of strategy based on connection request arrival rate in 5G wireless communication system.
The foregoing is only for aiding in understanding the method and the core of the invention, but the scope of the invention is not limited thereto, and it should be understood that the technical scheme and the inventive concept according to the invention are equivalent or changed within the scope of the invention by those skilled in the art. In view of the foregoing, this description should not be construed as limiting the invention.
Claims (10)
1. The 5G wireless communication signal access control method based on intelligent multiple-variable-rate multiple services is characterized by comprising the following steps:
s1, constructing a 5G wireless communication system model based on intelligent multi-rate multi-element service, and establishing access control conditions of new connection request connection and handoff request connection of a user in a coverage area;
S2, designing an access control strategy function of a coverage area, adopting a CP strategy function as an access control strategy base, ensuring that a handoff request takes precedence over a new connection request, and modeling the access control strategy based on access control conditions;
S3, simulating the movement behavior of the user in the 5G wireless communication system model, and calculating the probability of the user connecting or leaving the 5G wireless communication system in the movement process;
S4, combining the mobile behaviors of the users, and evaluating the access control strategy function by calculating the blocking probability and the discarding probability according to the evolution of the coverage area occupation state processed by the access control strategy function and the multidimensional extinction process of the coverage area.
2. The method for controlling access of 5G wireless communication signals based on intelligent multiple-rate multiple services according to claim 1, wherein the step S1 is to construct a 5G wireless communication system model based on intelligent multiple-rate multiple services, specifically as follows:
setting signal coverage areas of a plurality of 5G base stations as cells ,And providing two service types, namely single-mode service and dual-mode service in the coverage area, wherein the dual-mode service comprises dual-mode full-rate service and dual-mode reduced-rate service, and the user mobile equipment with different service types performs new connection request or handoff connection request.
3. The intelligent multiple-variability multiple-service based 5G wireless communication signal access control method according to claim 2, wherein the access control conditions in S1 include a cellWhether or not to accept different service typesSix cases of new connection request and handoff connection request are performed, specifically as follows:
Cell The conditions for accepting the new connection request of the single mode service are as follows:
Cell The conditions for accepting the "single mode service" handoff connection request are:
Cell Conditions for accepting a new connection request of "dual mode full rate service":
Cell Conditions for accepting a "dual mode full rate service" handoff connection request:
accepting "dual mode full rate service" from neighbor cells to cells Conditions for handoff connection request in "dual mode reduced rate service":
accepting "dual mode reduced rate service" from neighboring cells to cells Conditions for handoff connection request in "dual mode reduced rate service":
Wherein, the Representing the current totalityThe cell is used for receiving call service type and the online capacity needed to be occupiedRepresent the firstSignal coverage of each base station; Representing the bandwidth occupied by "single mode services", Representing the bandwidth occupied by a "dual mode full rate service"; Representing cells Is a capacity of (2); Representing the threshold for new connection requests and sigma representing the threshold for handoff connection requests.
4. The method for controlling access of a 5G wireless communication signal based on intelligent multiple-rate multiple services according to any one of claims 1 to 3, wherein S2 is specifically as follows:
The cell capacity is The constraint requirements of the basic bandwidth unit are as follows:
Wherein, the Representing allThe call service type is selected, and the online capacity is required to be occupied; Represent the first Signal coverage of each base station, total connection capacity available; Representing the type 1 call service; representing the type 2 call service; representing the 3 rd call service type; Representing cells Occupancy vector of the overall service; Representing each service type Is a basic bandwidth unit of (1);
At any time, a cell The medium service type isThe number of connections is: For each cell New access request and handoff access request of service type S epsilon S, access control strategy is respectively passed through strategy functionAndModeling is carried out;
The handoff access request must have a higher priority than the new connection request, i.e. the following conditions should be met:
,
Wherein, the Representing cellsType of service not accepted in (b)A new connection request policy function; Representing cells Not accepting service types from neighboring cellsTo service typeA handoff connection request policy function;
Design of policy functions using CP policy functions And。
5. The intelligent multiple-variability multiple-service based 5G wireless communication signal access control method according to claim 4, wherein said policy functionModeling, when a service typeAttempting to access the cellWhen the CP policy passes or refuses, the CP policy is passed or refused according to the following conditions:
Wherein, the Representing a single mode service; Psi represents the capacity to guarantee new call connection requests;
When=1, it means that when a service type Attempting to access the cellWhen the CP strategy refuses to connect the new call;
When=0, it means that when one service type Attempting to access the cellThe CP policy will then approve the new call connection.
6. The intelligent multiple-variability multiple-service based 5G wireless communication signal access control method according to claim 5, wherein said policy functionModeling is specifically as follows:
Wherein, the A single-mode service is represented and,Representing a dual mode full rate service,Representing a dual mode reduced rate service;
=1, indicating when a service type Attempting to access the cellWhen the call connection request is received, the CP strategy refuses the single-mode service, the dual-mode full-rate service and the dual-mode reduced-rate service of the handoff;
=0, indicating when a service type Attempting to access the cellAt this time, the CP policy may approve the handoff of the single mode service, the dual mode full rate service, and the dual mode reduced rate service call connection request.
7. The intelligent multiple-variable-rate multiple-service-based 5G wireless communication signal access control method according to claim 6, wherein S3 is specifically as follows:
For different types of services, cells The channel hold time in (a) is defined as: The parameters of the holding time are: a user holding a connection of a certain type of service, the user having a probability of leaving or continuing to connect to the 5G wireless communication system at the end of its channel hold time;
Probability of leaving 5G wireless communication system The calculation formula is as follows:
Probability of continuing to move and connect to neighboring cells The calculation formula is as follows:
Wherein, the Representing a slave cellA probability of handoff attempt to a service type s of a neighboring cell j; indicating the remaining connection time, the average value is ;Representing cellsThe cross-boundary time after the user enters is as follows, the average value is。
8. The intelligent multiple-variability multiple-service based 5G wireless communication signal access control method according to claim 7, wherein the evolution in S4 is performed according to a multidimensional vanishing procedure, specifically as follows:
User handoff connection request or new connection request is cell Accepting as a life event, the user terminating the connection or leaving the cellAs a dead event, calculating the birth rate and the death rate in the process of birth and death;
Cell Type of medium serviceThe blocking probability of new connection requests is:
Cell Type of medium serviceThe drop probability of the handoff connection request is:
Wherein, the Representing cellsIn a viable stateProbability of (2);
Is provided with Indicating entry into a cellPreviously from service typeSwitching to service typeThe generation rate of the handoff connection request is as follows:
Wherein, the R represents the arrival rate of the non-adaptive rate handoff call processed by the access control strategy function, ∂ represents the arrival rate of the adaptive rate handoff call processed by the access control strategy function; representing the type of service in a secondary neighbor cell j To cellA handoff rate of service type t;
Is provided with Indicated in the associated cellCorresponding service type in life-to-life processMortality of (2) is:
Wherein, the Representing cellsType of medium serviceIs a number of connections.
9. The intelligent multiple-variable-rate multiple-service-based 5G wireless communication signal access control method according to claim 8, wherein the calculating of the blocking probability and the discarding probability in S4 is specifically as follows:
Based on a policy function AndObtaining corresponding blocking probability by iteratively solving global balance of the living and extinguishing processAnd drop probability。
10. The intelligent multiple-variability multiple-service based 5G wireless communication signal access control method according to claim 9, wherein the global balance of the process of extinction is solved by iteration, and the following iterative fixed point algorithm is adopted:
first step, for all cells And service typeInitializing=0,=0;
Second, if the condition is |||+||If | > ε is true, then solve for the handoff rate;
Third, calculating the yieldProbability of blockingProbability of discardThen updating:=,=;
Returning to the second step until the calculation result meets the condition ||+||||<ε;
Wherein, the |b|| represents the sum of absolute value differences of all probability terms: the tolerance epsilon=10 -5 is set.
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| CN101527678A (en) * | 2009-04-15 | 2009-09-09 | 南京邮电大学 | Method for controlling multi-service comprehensive distinction based on fuzzy flow perceiving |
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