KR100578302B1 - Method for resource management of next generation mobile communication network - Google Patents

Abstract

The present invention relates to a resource management method in a next generation mobile communication network.

In the next-generation mobile communication network, a resource management method applies a load parameter of handover calls requesting a handover to the current cell and calls requesting a handover from the current cell to an adjacent cell as a decision parameter in call admission control. The call is accepted to ensure the minimum transmission rate, and the current load state and neighboring cells are dynamically monitored for the movement of the handover call to perform the load control with the appropriate load.

In this way, by accepting a new call or a handover call according to the resource usage of the current network and the movement of the mobile terminal, an appropriate load is always applied to the network to prevent excessive load from occurring, and also periodically By adjusting the amount of reservation resources by quality class, it is possible to guarantee the quality of service required by the mobile terminal performing real-time service even when moving from a cell with a low cell load to a cell region with a high cell load, and also reducing the cell radius. And can efficiently support the mobility of the terminal.

Next Generation Mobile Network, Handover, Call Admission Control, Load Control, Resource Usage

Description

Resource Management in Next Generation Mobile Networks {METHOD FOR RESOURCE MANAGEMENT OF NEXT GENERATION MOBILE COMMUNICATION NETWORK}

1 illustrates a configuration of a resource management system in a next generation mobile communication network according to an embodiment of the present invention.

2 illustrates a basic model of admission control according to an embodiment of the present invention.

3 is a flowchart illustrating a resource management method in a next generation mobile communication network according to an embodiment of the present invention.

4 illustrates a load control model using surplus resource information according to an embodiment of the present invention.

5 illustrates a resource structure for performing a secondary load control algorithm according to an embodiment of the present invention.

The present invention relates to a resource management method in a next generation mobile communication network, and in particular, a resource management method in a next generation mobile communication network for preventing overloading of a network by performing call admission control according to current resource usage and resource usage of a terminal. It is about.

Through handover that occurs due to movement between cells, the terminal has various types of channel / load environments. When a terminal moves from a cell with a low load to a cell region with a high load, the mobile communication system should be able to guarantee the quality of service required by the mobile terminal.

In addition, for a high speed multimedia service, a cell having a smaller radius than a conventional cell is required in a next generation mobile communication system, and more handover will occur. In this frequent handover situation, the mobile terminal requires a certain level of quality of service as in the case where no handover is performed. Therefore, the admission control or the load control is required.

In particular, in the next generation mobile communication system, in order to determine whether to handover with a target cell, it is necessary to determine whether the handover service is available (capability of serving).

That is, it is necessary to determine whether to accept the handover service according to the load of the target cell. In particular, when there is insufficient resources to accommodate the real-time service, a situation arises in which the truncation with the cell is to be performed. Therefore, call admission control and load control considering the mobility of the mobile terminal are urgently required.

The technical problem to be achieved by the present invention is to perform the call admission control and the load control in consideration of the current network resource usage and mobility of the mobile terminal to ensure the service quality of real-time services even in the event of frequent handovers It is to provide a resource management method in a mobile communication network.

In order to solve this problem, the present invention accepts a new call / handover call according to the current network resource usage and the resource usage according to the movement of the terminal, and when the load control of the network by call acceptance is insufficient, Perform load control for overall resource operation.

A resource management method in a next generation mobile communication network according to an aspect of the present invention is a resource management method in a next generation mobile communication network for a base station to accept a connection request from a mobile terminal, the method comprising: a) a new call / handover from the mobile terminal; Classifying a quality of service class according to characteristics of each call and measuring resource usage of a current network when requesting a connection request of a call; b) accepting the new call or the handover call so as to guarantee the minimum transmission rate for all calls according to the resource usage of the network measured in step a); And c) controlling the load of the network to a certain level by monitoring the current load state and the movement state of the handover call of adjacent cells when the load control of the network by step b) is insufficient.

Step b) is preferably accepted if the minimum transmission rate of the new request of the new call / handover calls is less than the surplus resources.

The surplus resource is preferably calculated by Equation 2 below periodically or at every admission control request.

In the step c), when the amount of the surplus resources is less than zero, the amount of resources of each class (RT) is obtained by sharing the common resources by primary load control. Increasing to a minimum value that results in; And c-2) reallocating a transmission rate of each class by secondary load control such that the amount of resources of each class is compared with a reference value such that the amount of resources of each class is at a reference level. Do.

DETAILED DESCRIPTION Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings so that those skilled in the art may easily implement the present invention. As those skilled in the art would realize, the described embodiments may be modified in various different ways, all without departing from the spirit or scope of the present invention. In the drawings, parts irrelevant to the description are omitted in order to clearly describe the present invention. Like parts are designated by like reference numerals throughout the specification.

In the 4th generation mobile communication system providing a mobile multimedia service, traffic having various traffic characteristics must be simultaneously transmitted. To this end, the mobile communication system must provide a transmission service in the network that can guarantee traffic in accordance with the quality of service (QoS).

The traffic characteristics per call can vary depending on the application, and the application can have different quality of service (QoS) for each call, and the network must tailor the quality of service (QoS) to every call individually.

Since this method is difficult to implement because of the complexity of the network having to provide different services for each call, in the embodiment of the present invention, a few representative service classes are defined and corresponding service quality ( QoS) class.

That is, the quality of service structure is defined as a structure having the following four quality of service classes, and the base station assigns the appropriate quality of service class to each traffic characteristic of each call and uses the admission control, load control, and resource allocation algorithms in the cell. To be controlled during service.

<Service Quality Structure>

1) LL Class (Low Delay, Low Loss Class)-A quality of service class with low latency and weak traffic characteristics.

2) LH Class (Low Delay, High Loss Class)-A quality of service class that has strong loss-to-loss and low latency real-time traffic characteristics,

3) HL class (High Delay, Low Loss Class)-a quality of service class that is strong in delay and weak in traffic,

4) HH Class (High Delay, High Loss Class)-Class of quality of service that has strong traffic against delay and loss.

In this quality of service structure, priority is given to LL class> LH class> HL class> HH class to assign priority to traffic in real time.

The buffer resource allocates a large amount to the LL class and the LH class which are sensitive to packet loss, so that when the transmission bandwidth is short, it is stored in the buffer to reduce the loss.

First, a resource management system in a next generation mobile communication network according to an embodiment of the present invention will be described in detail with reference to FIG. 1.

1 illustrates a configuration of a resource management system in a next generation mobile communication network according to an embodiment of the present invention, and FIG. 2 illustrates a basic model of admission control according to an embodiment of the present invention.

As shown in FIG. 1, a resource management system in a next-generation mobile communication network according to an embodiment of the present invention includes a handover control unit 10, a resource operation unit 20, an admission control unit 30, and a load control unit 40. Include.

The handover control unit 10 generates and outputs handover state information of a handover call requesting input to the current cell and handover calls requesting handover from the current cell to an adjacent cell.

The resource management unit 20 adjusts the resource allocation based on the state information of the current occupied resources and available resources.

As shown in FIG. 2, the admission control unit 30 accepts a service request that can guarantee a minimum transmission rate for all calls.

Here, the minimum data rate value is a value that should be guaranteed for any service request including handover.

Therefore, when the new call is accepted, the admission control unit 30 accepts only when the delay limit for the current call is guaranteed without affecting the delay of the existing class traffic.

The load controller 40 accepts a new call and a handover call according to the current network resource usage by the admission controller 30 to control the load based on the information of the surplus resources RC _i so that an appropriate load is always applied to the network. Prevent excessive loads from occurring

Next, operations of a resource management system in a next generation mobile communication network according to an embodiment of the present invention will be described in detail with reference to FIGS. 2 to 5.

3 is a flowchart illustrating a resource management method in a next generation mobile communication network according to an embodiment of the present invention, and FIG. 4 is a load control model using surplus resource information according to an embodiment of the present invention.

As shown in FIG. 3, in the resource management method of the next generation mobile communication network according to the present invention, when the resource management system receives a request for connection of a new call or a handover call (S1), the admission control unit 30 operates the resource. Appropriate load is always applied to the network by accepting new and handover calls according to the current network resource usage from the unit 20. (S2)

In this case, the connection of each call is accepted when the condition of Equation 1 below is satisfied, the call acceptance is performed for each quality of service class, and the unit of each parameter is a value defined for each class.

Here, i means a class number (LL, LH, HL, HH), N _ij means the minimum rate (New Rate) for the new request, RCi is an available resource as the following equation Calculated by two.

는 임의의 클래스 C에 해당하는 서비스를 수행하는 호들의 전송률의 합이다.

는 임의의 클래스 C에 해당하는 서비스를 수행하고 현 셀로의 핸드오버를 요구하는 호들의 서비스 전송률의 합이고,

는 임의의 클래스 C에 해당하는 서비스를 수행하고 현 셀에서 목적 셀로의 핸드오버를 요구하는 호들의 서비스 전송률의 합이다. 여기서, 클래스 C는 클래스 번호 i에 해당하는 클래스 중 임의의 클래스를 나타낸다.Here, RT _i is a value that is periodically changed by the load control, the amount of resources allocated to any quality of service class C,

Is the sum of the transmission rates of calls performing a service corresponding to any class C.

Is the sum of the service rates of calls that perform a service of any class C and require handover to the current cell,

Is the sum of the service rates of calls performing a service corresponding to any class C and requesting handover from the current cell to the destination cell. Here, class C represents any class among classes corresponding to class number i.

In this case, the service transmission rate refers to a transmission rate set during admission control or a readjusted rate by load control according to the class characteristics.

As shown in Figure 4, surplus resources are reflected in the resource allocation policy, including load and admission control.

The increase in the load that the setting of the radio access bearer of the radio access network will have on the radio network is measured. This load measurement is performed to distinguish the uplink and the downlink, and the requested bearer is accepted only when the uplink and downlink admission control allows.

The transmission rate of each call connection may vary with time, and even at the same transmission rate, more resources may be required due to the movement of the mobile terminal.

Allowing the air interface load to increase excessively will reduce the area of the cell below the planned value and cannot guarantee the quality of the currently connected service. Therefore, call admission control alone may not be sufficient to prevent overload, and a load control algorithm that dynamically monitors the current load state and the movement state of handover calls of adjacent cells and controls it at an appropriate load at a high speed is required.

The load control unit 40 is performed based on the RCi information and controls the load by increasing and decreasing RCi.

인지를 판단하여(S4), RC_i가 0보다 작은 경우에 1차 부하 제어에 의한 공용 자원(Shard)의 점유를 통하여 RT_i의 양을 기준치까지 증가함으로써 자원의 유동성에 대처하도록 한다.(S5)That is, when the RC _i information is generated by the above equation (2) (S3), the load control unit 40

If the RC _i is less than zero (S4), it is possible to cope with the liquidity of the resource by increasing the amount of RT _i to the reference value through the occupancy of the common resource (Shard) by the primary load control (S5). )

As shown in Equation 3 below, RT _i is less than the sum of the reserved resource amount and the shared resource amount (shard) of each class, where Rr _i is the reserved resource amount of each class.

In this way, the primary load control is a load control for resource management from a class perspective, but the secondary load control is a load control for overall resource operation.

That is, when RC _i <0, the load control unit 40 performs the first load control algorithm to reduce the amount of RT _i as the minimum value (RCi> 0) through the occupation of common resources (Shard). Increase until it is.

In this case, RT _i expresses the transmission rate (Downlink, RT _{tr, i} ) and the reception rate (Uplink; RT _{re, i} ) at the same time, and the primary forward load control for the downlink and the primary reverse load for the uplink The control has the same structure.

가 부하의 평가 척도로 사용한다.(S6)The load control unit 40 performs the secondary load control algorithm

It is used as an evaluation measure of load (S6).

5 illustrates a resource structure for performing a secondary load control algorithm according to an embodiment of the present invention.

As shown in FIG. 5, the secondary load control algorithm has performance reference values R ₋₀ , R ₀ , and R _+0, and RT denotes a transmission rate (Downlink; RT _tr ) and a reception rate (Uplink; RT _re ). Simultaneously expressed, the uplink and downlink have the same structure. Here, as shown in FIG. 5, the positive reference value R _{+ 0} is the largest, the negative reference value R− ₀ is the smallest, and the specific reference value R ₀ is located therebetween.

If RT> R ₊₀ , the load control unit 40 performs a secondary load control algorithm to reallocate the transfer rate of each class to lower than R ₀ , and if RT <R _-0 , performs a load control algorithm for each class. Reallocate the baud rate and raise it above R ₀ .

In this case, the load control unit 40 includes not only the service call but also the handover calls as a target of the load control algorithm, and includes the handover call in the rate reassignment during the call admission control of the handover call.

Thus, in the embodiment of the invention periodically or admission control generate a RC _i information for each on-demand, and to use this RC _i information to efficiently cope with the cells increase in load due to the arcs handover future resource allocation partitioning policy Set it again.

It controls call acceptance, load control, and resource allocation for each class, which can actively cope with the change of resource occupancy due to frequent handover, and works efficiently in a small cell environment with high speed mobility.

Although the preferred embodiment of the present invention has been described in detail above, the present invention is not limited thereto, and various other changes and modifications are possible.

As described above, the resource management method in the next-generation mobile communication network according to the present invention always accepts a new call or a handover call according to the resource usage of the current network and the movement of the mobile terminal, so that an appropriate load is always applied to the network, resulting in excessive load. There is an effect that can prevent.

In addition, the resource management method in the next-generation mobile communication network according to the present invention periodically adjusts the amount of reservation resources by quality of service class, thereby performing real-time service even when moving from a cell having a low cell load to a cell region having a high cell load. Not only can the service quality required by the mobile terminal be guaranteed, but the cell radius can be reduced and the mobility of the terminal can be efficiently supported.

Claims (12)

A resource management method in a next generation mobile communication network for a base station to accept a connection request from a mobile terminal, a) classifying a quality of service class according to characteristics of each call and measuring resource usage of a current network when a request for connection of a new or handover call is requested from the mobile terminal; b) accepting the new call or the handover call so as to guarantee the minimum transmission rate for all calls according to the resource usage of the network measured in step a); And c) controlling the load of the network to a predetermined level by monitoring the current load state and the movement state of the handover call of neighbor cells when the network load control by step b) is insufficient; Resource management method in the next-generation mobile communication network comprising a. The method of claim 1, The quality of service class in step a), LL class (Low Delay, Low Loss Class) for services with low latency and weak traffic characteristics, LH class (Low Delay, High Loss Class) for services with high loss and low latency real-time traffic characteristics, High-delay and low-loss classes are defined as high delay, low-loss classes, and high-delay and high-loss services are defined as high delay and high loss classes, respectively. Resource management method in next generation mobile communication network. The method of claim 1, B), The resource management method of the next generation mobile communication network to perform the admission control for each of the quality of service class, and to define the unit of each parameter used for the admission control and load control. The method of claim 1, B), Accepting when the minimum transmission rate of the new request of the new call or the handover calls is less than the surplus resource according to the following relationship;

I denotes a class number, N _ij denotes a minimum rate for new request, and RCi denotes an available resource; Resource management method in the next generation mobile communication network, characterized in that. The method of claim 4, wherein The surplus resource is calculated by the following equation periodically or at each admission control request;

Where RT _i is the amount of resources allocated to any quality of service class C,

Is the sum of the transmission rates of calls performing services of any class C,

Is the sum of the service rates of calls that perform any class C service and require handover to the current cell,

Is the sum of the service rates of the calls that perform any class C service and require handover from the current cell to the destination cell; Resource management method in the next generation mobile communication network, characterized in that. The method of claim 5, The service rate is, A resource management method in a next generation mobile communication network, wherein the transmission rate is set at the time of admission control according to the characteristics of the quality of service class, or the rate is adjusted by load control. The method of claim 5, C), c-1) If the amount of surplus resources is less than zero, increase the amount of resources (RT) of each class through the common resource occupancy by primary load control to a minimum value such that the amount of surplus resources becomes zero or more. Making a step; And c-2) comparing the amount of resources of each class with a reference value, and reallocating a transmission rate of each class by secondary load control such that the amount of resources of each class is at a reference level; Resource management method in the next-generation mobile communication network comprising a. The method of claim 7, wherein The amount of resources of each class is A resource management method in a next generation mobile communication network that is equal to or less than the sum of the reserved resource amount and the common resource amount of each class. The method of claim 7, wherein The amount of resources of each class represents a transmission rate and a reception rate at the same time. The method of claim 7, wherein Step c-1), A resource management method in a next generation mobile communication network which performs the same primary forward load control for downlink and primary reverse load control for uplink. The method of claim 7, wherein Step c-2), If the amount of resources (RT) of each class exceeds a positive reference value (R _{+ 0} ), the second load control reallocates the transmission rate of each class to specify a smaller value than the positive reference value (R _{+ 0} ). Lowering it below a reference value R ₀ ; And If the resource amount RT of each class is less than the negative reference value R _{-0 which} is smaller than the specific reference value R ₀ , the rate of each class is reassigned by the secondary load control and the specific reference value ( Raising step above R ₀ ) Resource management method in the next-generation mobile communication network comprising a. The method of claim 1, C), A resource management method in a next generation mobile communication network that performs load control including a call currently in service and a handover call.

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