KR100596638B1 - Radio resource management method and mobile device in mobile communication system - Google Patents

Abstract

The present invention relates to a radio resource management method and a device thereof in a mobile communication system.

In the present invention, the base station determines the current radio resource utilization state in the current wireless access environment, sets the variable, classifies the data characteristics according to the data request quality of the service requested by the user, and allocates the radio resource through the radio resource allocation variable After that, the radio resource allocation variable is periodically checked to determine whether to change the radio resource allocation variable by changing the radio resource utilization state.

According to the present invention, the base station is smoothly allocated to users by dynamically allocating radio resources according to the performance and speed provided for each service by dividing the service requested by the user according to the data demand quality according to the radio utilization in the current wireless access environment. Multimedia services can be provided. In addition, it is possible to operate the limited radio resources more efficiently, to ensure the wireless connection according to the service required by the user, and to increase the utilization of the limited radio resources.

Next generation mobile communication system, radio access control layer, radio resource utilization status, radio resource allocation variable

Description

TECHNICAL FOR WIRELESS RESOURCE MANAGEMENT OF MOBILE COMMUNICATION SYSTEM AND APPARATUS THEREOF

1 illustrates a schematic wireless network structure of a mobile communication system to which the present invention is applied.

2 is a structural diagram of a device station according to an embodiment of the present invention.

3 is a flowchart illustrating a radio resource management method of a mobile communication system according to an exemplary embodiment of the present invention.

4 is a radio resource utilization state transition diagram in a radio resource management method of a mobile communication system according to an embodiment of the present invention.

5 is a diagram illustrating a data processing procedure from a mobile terminal in a radio resource management method of a mobile communication system according to an embodiment of the present invention.

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a radio resource management method of a mobile communication system, and more particularly, to a radio resource management method and apparatus thereof for ensuring a connection quality on a radio access control layer of a radio protocol layer.

The mobile communication system uses a limited radio resource, and the propagation characteristics of the radio link change with time due to the change of distance between the terminal and the base station, shadowing, fast fading, and noise. Keep changing.

In the mobile communication system, link adaptation technology is a technology for appropriately allocating and controlling radio resources by adapting to a change in characteristics of each link when simultaneously providing services to multiple users in a cell.

The next generation mobile communication system aims to provide various multimedia communication services including high-speed mobile Internet, so that multimedia traffic applied to the system as an input load is much more complicated and varied than traditional voice traffic. As described above, a technique for adaptively allocating radio resources by adapting to traffic changes is a traffic adaptation technique.

In mobile communication systems, link adaptation and traffic adaptation technologies are core technologies for providing various multimedia services to various users using limited radio resources.

Radio resource management technologies include call admission control, congestion control, dynamic channel allocation, handoff, power control, rate control, packet scheduling, load sharing scheme, and automatic repeat request (ARQ).

The core technology of radio resource management is a system technology for constructing optimal schemes for comprehensively managing resources in a radio section based on the type of traffic, system characteristics of a transmitter, channel characteristics, and information required from a receiver.

In the wireless channel, various services such as e-mail, file transfer, and the World Wide Web are expected to be provided. Each of these services has different types of service requirements.

Real-time communications such as video telephony allow some transmission errors, but services must be maintained at minimum transmission speeds, while services that are not sensitive to transmission delays, such as file transfers, have a minimum transmission speed. You can drop it. That is, if the transmission rate is controlled in consideration of the congestion of the wireless network according to the service type of the user, the radio resource can be efficiently used.

Scheduling is a technique for determining a user to be transmitted, a transmission time point, a transmission rate, etc. in order to efficiently utilize a system for a service request. Current wireless management research and development is generally considered to be power control, rate control, packet scheduling, and congestion control.

Here, the congestion control may be referred to as a mixed function of a mixed state, for example, power control + rate control, power control + scheduling, power control + congestion control, rather than independent functions.

Unlike voice call service-oriented systems, packet traffic not only has bursty characteristics but also requires various QoS for each traffic. In addition, apart from traffic characteristics, a scheduling algorithm capable of supporting priority among users or services should be presented. Therefore, in order to effectively manage finite radio resources, direct control of the traffic to which resources are allocated is required.

Radio access technologies, which are the most important part of the next generation mobile communication system for multimedia services, including high-speed data transmission, are roughly classified into a physical layer and a protocol layer.

Above, the physical layer technology consists of modulation / demodulation, spreading / despreading, channel coding, and various diversity techniques, and includes radio resource management (RRM) despite many efforts up to now. The protocol field is relatively weak.

In next-generation mobile communication systems, where packet data transmission will be the dominant, call admission control (CAC) / congestion control (CC), for traffic transmission requiring various quality of service (QoS) In a system in which dynamic channel allocation (DCA), handoff, power control (PC), rate control (RC), packet scheduling, and circuit packet coexist Hybrid scheduling, ARQ, and so on are important functions for radio resource utilization.

The demand for packet data service including the Internet is increasing in wireless communication, but the existing mobile communication terminal mainly provides voice calls, and has a function of transmitting a small amount of data such as SMS (Short Message Service). have.

Hereinafter, a radio resource management technique in a conventional mobile communication system will be described.

First, the radio resource management protocol processing method of the conventional next generation mobile communication system divides layer-3 into a call control function block, a radio resource management function block, and a mobility management function block, and excludes correlation between blocks. It is to make it easy to change or add new functions. However, this conventional technology only proposes a method of processing a radio resource management protocol in a radio resource management function block.

Another conventional technique is to allocate resources by comparing a QoS limit set for each routing area with a requested QoS in a packet service of a mobile switching center, so that a large number of service subscribers are registered in a specific area or the traffic load in that area is high. There is a way to reduce the packet denial rate. This prior art proposes a service quality control method of a mobile communication system to improve service satisfaction of multiple subscribers.

Another conventional technology is a radio resource management method that defines a class according to resource availability rate to notify the user of the availability rate change by using an alarm for each class, and allows the user to simply manage the expansion or reduction of resources. This prior art allows the base station manager to check the base station resource status in real time, and to efficiently manage the base station resource by presenting the criteria for resource extension and reduction.

As described above, the radio resource management technology of the mobile communication system according to the prior art does not mention the efficient management or operation of limited radio resources, and it is difficult to actively cope with the differentiated service requirements according to the needs of the subscribers, and the radio resource utilization There is a problem in that there are many constraints.

 The technical problem to be achieved by the present invention is to allocate the radio resources according to the performance and speed provided by each data service according to the utilization of the radio resources in the current wireless access environment radio resources of the mobile communication system for providing a smooth multimedia service to users It is to provide a management method.

In order to solve this problem, the present invention divides a service requested by a user according to data request quality, and then allocates a radio resource in consideration of a current radio resource utilization state.

In the radio resource management method of a mobile communication system according to an aspect of the present invention, when a plurality of mobile terminals access a wireless network or a wired network through a base station, the mobile communication system for providing a variety of multimedia services using a limited radio resources A radio resource management method of claim 1, comprising: (a) determining a current radio resource utilization state in a radio access environment of the mobile communication system and setting the radio resource allocation variable; (b) classifying data characteristics according to data request quality through a service requested by a user through the mobile terminal, and allocating radio resources by classifying them through the radio resource allocation variable set in step (a); And (c) when the radio resource allocation is performed in the step (b), after changing the radio resource utilization state by periodically checking the radio resource allocation variable set in the step (a), changing the radio resource allocation variable. Determining whether or not.

The radio resource utilization state of step (a) may include an initial state of the radio resource or an idle state in which the radio resource is released; A resource reservation state that transitions when the radio resources are allocated in the idle state, allocates the radio resources according to a user's request, and transitions to the idle state when the radio resources are released; A resource adaptation state that transitions to a resource reservation state if the utilization of the radio resource in the resource reservation state is equal to or greater than an average utilization rate of a radio resource allocation unit; And a resource monitoring state in which the utilization of the radio resource in the resource adaptation state exceeds the upper limit of the average utilization rate, and transitions to the resource adaptation state if the utilization rate is less than the upper limit of the average utilization rate.

An apparatus for managing radio resources according to another aspect of the present invention is a radio resource management apparatus of a mobile communication system for providing various multimedia services using radio resources when a plurality of mobile terminals access a wireless network or a wired network. A resource utilization measuring unit configured to measure a current radio resource utilization state in a wireless access environment of the mobile communication system; A state transition unit for setting a radio resource allocation variable according to the measured radio resource utilization state; And a resource allocator configured to classify data characteristics according to data request quality through the mobile terminal according to the data request quality and classify the radio resources by allocating the radio resources by classifying the set radio resource allocation variable. If so, the set radio resource allocation variable is periodically checked to allow the radio resource utilization state to transition.

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.

First, a radio resource management method of a mobile communication system according to an embodiment of the present invention will be described in detail with reference to FIGS. 1 to 5.

1 illustrates a schematic wireless network structure of a mobile communication system to which the present invention is applied, and FIG. 2 is a structural diagram of a base station according to an embodiment of the present invention.

As shown in FIG. 1, in a mobile communication system, a plurality of wireless mobile terminals are connected to a base station through a wireless network.

As shown in FIG. 2, the base station 100 includes a base station controller 110, a digital signal transceiver 120, and an analog signal transceiver 130.

The base station control apparatus 110 includes a resource utilization measurement unit 111 for measuring a utilization state of a radio resource, a state transition unit 112 for transitioning a utilization state according to a utilization state of a radio resource, and a radio resource with respect to input data. It includes a resource allocation unit 113 to allocate.

Meanwhile, the digital transceiver 120 may include a transmitter 121 and a receiver 122 for selectively performing a transmission / reception function. The transmitting unit 121 modulates and encodes various signals transmitted from the base station control apparatus 110 having the structure as described above, and the analog signal transmitting and receiving apparatus 130 transmits the modulated and encoded signals over the air. Broadcast to terminals.

In addition, the receiver 122 of the analog signal transceiver 130 and the digital transceiver 120 may receive various signals transmitted from the terminals and transmit the signals to the base station controller 110.

Next, a radio resource management method according to an embodiment of the present invention will be described based on such a structure.

3 is a flowchart illustrating a radio resource management method of a mobile communication system according to an exemplary embodiment of the present invention.

In such an unstructured network structure, as shown in FIG. 3, the radio resource management method of the mobile communication system according to the embodiment of the present invention is a radio resource in which a base station is limited when a plurality of mobile terminals access a wireless network or a wired network through a base station. Radio resource management for providing various multimedia services is performed using.

In detail, the base station 100 determines a current radio resource utilization state in a wireless access environment of the mobile communication system and sets a radio resource allocation variable (S1).

At this time, each radio resource utilization unit, that is, a layer managing a radio resource, has a radio resource utilization state as shown in FIG. 4. 4 is a diagram illustrating a state transition of radio resource utilization in a radio resource management method of a mobile communication system according to an embodiment of the present invention.

The radio resource utilization state is the basis for setting the radio resource allocation variables, and according to the radio resource utilization state, idle state (IDLE), resource reservation state (RE: RESOURCE RESERVATION), resource adaptation state (RF: RESOURCE FITNESS), resource monitoring state ( RO: RESOURCE OBSERVATION.

The idle state is an initial state of a radio resource or a state in which radio resources are released. In an idle state, the base station 100 starts radio resource allocation and transitions to a resource reservation state. In the resource reservation state, the base station 100 requests a user's request. According to the present invention, radio resources are allocated without restriction.

The resource utilization measuring unit 111 of the base station 100 periodically checks the radio resource utilization and transmits it to the state transition unit 112. The state transition unit 112 has a radio resource utilization average usage rate of the radio resource allocation unit. If it is above, the radio resource utilization state is shifted from the resource reservation state to the resource adaptation state, and when the radio resource utilization exceeds the usage limit in the resource adaptation state, the radio resource utilization state is shifted to the resource monitoring state.

When the resource utilization state falls below the upper limit of usage, the radio resource transitions back to the resource adaptation state.In the resource adaptation state, when the radio resource utilization falls below the average utilization rate, the state transitions back to the resource reservation state. Transition to initial idle state.

Meanwhile, the state transition unit 112 of the base station 100 operates the radio resource allocation by the management table as shown in Table 1 below.

The management table classifies data services into guaranteed services, controlled load services, and best-effort services according to the quality of service of data transmitted from the mobile terminal. High-priority services, controlled services are general data services, and best-in-class services are not very closely related to time and are low priority services.

Looking at the management table, since there is no user request in the idle state, resources are not allocated to all data services. In the resource reservation state, the radio resources required by the user are allocated to all data services.

In the resource adaptation state, the radio resources required by the user for the guaranteed and controlled services are allocated, and the radio resources of the limit for maintaining the resources of the resource adaptation state remaining for the best service are partially allocated.

In the resource monitoring state, the service is guaranteed for the guaranteed service of the user who is currently using the wireless resource, but the newly requested service is rejected, the radio resource is partially allocated or the service is waiting for the controlled service, and the best service is Enters the service standby state.

Subsequently, the resource allocation unit 113 of the base station 100 classifies data characteristics according to the data request quality of the service requested by the user through the mobile terminal as shown in FIG. 5 and refers to the radio resource allocation variable of the management table. Classify data and allocate radio resources (S2, S3, S4). 5 is a diagram illustrating a data processing procedure from a mobile terminal in a radio resource management method of a mobile communication system according to an embodiment of the present invention.

That is, when the mobile station transmits data in the state where the initial access and authentication is completed, the base station sets the quality of service (QoS) through the delimiter according to the required quality of the data.

The base station sets a resource allocation rule according to the set quality of service and the radio resource management state of the data. When the data is input to the queue according to the set resource allocation rule, the base station transmits data through the radio resource allocated by the scheduler. do.

The resource utilization measuring unit 111 of the base station 100 periodically checks the radio resource utilization state when the radio resource allocation is made, and according to the result, the state transition unit 112 transitions the radio resource utilization state as described above. After that, the radio resource allocation and operation variable generation rule is set (S5).

As described above, the radio resource management method of the mobile communication system according to an embodiment of the present invention can be used according to a data service required when a wireless access service is required in a state where a user located in a specific location and situation has a wireless mobile terminal. Since the connection type is different, it is necessary to efficiently support the radio resources required to support a specific service.

That is, the radio resource management method of the mobile communication system according to an embodiment of the present invention dynamically performs radio resource allocation for each data service required by the user according to the radio resource utilization in the current wireless access environment, thereby providing a service required by the user. It is possible to increase the utilization of radio resources while ensuring connection accordingly.

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

As described above, the radio resource management method of the mobile communication system according to the present invention divides the service requested by the user according to the data request quality according to the radio utilization in the current wireless access environment and allocates the radio resource according to the performance and speed provided for each service. By dynamically allocating, the base station can provide a smooth multimedia service to users and can operate a limited radio resource more efficiently.

By doing so, the radio resource management method of the mobile communication system according to the present invention can guarantee the radio connection according to the service required by the user and increase the utilization of the limited radio resource.

Claims (8)

In the radio resource management method of a mobile communication system for providing a variety of multimedia services using a limited radio resources when a plurality of mobile terminals are connected to a wireless network or a wired network through a base station, (a) setting a radio resource allocation variable by determining a current radio resource utilization state in a radio access environment of the mobile communication system; (b) allocating a radio resource by classifying data characteristics according to data request quality and classifying the service requested by a user through the mobile terminal through the set radio resource allocation variable; And (c) if the radio resource allocation is made, periodically checking the set radio resource allocation variable to determine whether to change the radio resource allocation variable after the radio resource utilization state transitions; Radio resource management method of a mobile communication system comprising a. The method of claim 1, The radio resource utilization state of step (a), An initial state of the radio resource or an idle state in which the radio resource is released; A resource reservation state that transitions when the radio resources are allocated in the idle state, allocates the radio resources according to a user's request, and transitions to the idle state when the radio resources are released; A resource adaptation state that transitions to a resource reservation state if the utilization of the radio resource in the resource reservation state is equal to or greater than an average utilization rate of a radio resource allocation unit; And The resource monitoring state transitions to the resource adaptation state if the utilization of the radio resources in the resource adaptation state exceeds the upper limit of the average utilization rate, and transitions to the resource adaptation state if it is less than the upper limit of the average utilization rate. Radio resource management method of a mobile communication system consisting of. The method according to claim 1 or 2, In step (a), And managing the radio resource allocation variable using a management table which is a reference for resource allocation according to a current radio resource utilization state. The method of claim 3, The management table, According to the service quality of the data transmitted from the mobile terminal, the data service is classified into a guaranteed service, a controlled service, and a best service, and according to the radio resource utilization status, whether to allocate resources for each data service, whether service is guaranteed, The radio resource management method of the mobile communication system is created whether or not to wait for service. The method of claim 4, wherein The management table, In the idle state, all data services are not allocated resources. In the resource reservation state, services of all data services are guaranteed, In the resource adaptation state, the guaranteed and controlled services are service guaranteed, and the best service is partially allocated a radio resource, In the resource monitoring state, the guaranteed service is service guarantee or resource part allocation, the controlled service is resource part allocation or service wait, and the best service enters a service wait state. The method according to claim 1 or 2, In step (b), (b-1) setting a quality of service (QoS) through a delimiter according to the characteristics of the data when the mobile terminal transmits data in a state where initial access and authentication are completed; (b-2) setting a resource allocation rule according to the radio resource allocation variable and the quality of service set in the step (b-1); And (b-3) allowing the data to be input to the queue according to the resource allocation rule set in step (b-2) and transmitting data through a radio resource allocated by a scheduler; Radio resource management method of a mobile communication system comprising a. In the radio resource management apparatus of a mobile communication system for providing a variety of multimedia services using a radio resource when a plurality of mobile terminals are connected to a wireless network or a wired network, A resource utilization measuring unit for measuring a current radio resource utilization state in a wireless access environment of the mobile communication system; A state transition unit for setting a radio resource allocation variable according to the measured radio resource utilization state; A resource allocator for classifying a service requested by a user through the mobile terminal according to the data request quality and classifying the radio resource by classifying the data through the set radio resource allocation variable. Including, The resource utilization measuring unit periodically checks the set radio resource allocation variable when a radio resource allocation is made so that the radio resource utilization state transitions. The method of claim 7, The radio resource utilization state, An initial state of the radio resource or an idle state in which the radio resource is released; A resource reservation state that transitions when the radio resources are allocated in the idle state, allocates the radio resources according to a user's request, and transitions to the idle state when the radio resources are released; A resource adaptation state that transitions to a resource reservation state if the utilization of the radio resource in the resource reservation state is equal to or greater than an average utilization rate of a radio resource allocation unit; And The resource monitoring state transitions to the resource adaptation state if the utilization of the radio resources in the resource adaptation state exceeds the upper limit of the average utilization rate, and transitions to the resource adaptation state if it is less than the upper limit of the average utilization rate. Radio resource management device consisting of.

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