KR20000015269A - Method for optimizing terminal operation in digital mobile telecommunication system - Google Patents

Abstract

PURPOSE: A method for optimizing terminal operation in a digital mobile telecommunication system is provided to control a network connection request by the terminal itself conceiving load of network connection. CONSTITUTION: A base station classifies grade of network load depending on state of the network load. The grade of the network load is carried in a system information message of a broadcast channel and is transmitted to a terminal by the base station. The terminal performs operations associated with an initial call request, a packet transmission rate, a determination of hand-over and a call cancel depending on the state of the network load. For instance, the base station classifies the network grade into five levels of 0 to 4 levels. When 0 level is received from the base station, the terminal requests the initial call freely. Thus, the method decreases the network load.

Description

Method of optimizing terminal operation in digital mobile communication system

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to terminal control of a digital mobile communication system employing a code division multiple access (CDMA) scheme. In particular, the present invention relates to a system information message using a system information message that is periodically transmitted to a broadcast channel. The present invention relates to a method for optimizing a terminal operation of a digital mobile communication system that transmits information on a network load to recognize a network load by itself and to control a network connection request.

In general, the digital mobile communication system employing the broadband-CDMA system integrates various mobile communication networks and services that are formed to provide various types of services into one, so that all possible mobile communication services are provided through this. to be.

Such a digital mobile communication system is a system for providing a comprehensive mobile communication service to a subscriber by having the ability to cope with a multi-service and a multi-environment using various types of wireless access and a large capacity of a subscriber.

In other words, it is a system that provides multimedia communication and international roaming services such as data and video with voice and transmission speed of up to 2Mbps, and implements wired / wireless integrated system based on ATM network.

1 is a network structure diagram for a digital mobile communication system to be put into practical use in the future.

Here, the UIM (User Identity Module) provides a network or a service provider with a means for distinguishing a user from a digital mobile communication system and a mobile terminal, and provides authentication and service processing capability.

In addition, MT (Mobile Terminal) has a Mobile Control Function (MCF) function that interacts with the network side for mobility management, a Call Control Agent Function (CCAF) function that provides service access to the user, and association and access of the terminal side. RACAF (Radio Access Control Agent Function) function to control the access link, control the application and interconnection of the access radio link at the terminal side, and perform the radio channel source and error prevention encoding / decoding Mobile Radio (MRTR) Transmission and Reception) function.

In addition, the BTS (Base Transceiver System) controls the application and interconnection of the SIBF (System Information Broadcasting Function) function responsible for overall control for system access information broadcasting, the access radio link associated with the BS access link, and the macro during handover. It performs diversity and performs a Radio Frequency Transmission and Reception (RFTR) function that performs radio channel source and error prevention encoding / decoding.

In addition, the base station controller (BSC) functions as a Radio Access Control Function (RACF) that performs overall control of the association and access links between the terminal and the network.

In addition, the Mobile Switching Center (MSC) is a Call Control Function enhanced (CCF ') function that controls call and connection processing, coupled with the CCF', and provides a function required by the interaction between the CCF 'and the Service Control Function (SCF). Service Access Control Function (SACF) that performs the processing and control of non-call / non-bearer related services such as SSF (Service Switching Function) function, mobility management, etc., which controls access link for exchange period handover. Perform ARF (Access Relay Function) function.

In addition, the VLR (Visited Location Register) contains basic terminal mobility service logic and is invoked by service requests from other functional entities to support location management, mobility management, and identifier management, and the mobility logic instance. Stores and accesses the Location Registration Control Function (LRCF), subscriber identifier and location data that interact with other functional entities to obtain user or network information or to access additional logic required to process the data. It checks for consistency and provides the Location Registration Data Function (LRDF), which hides the actual data structure from the LRCF and provides a logical view.

In addition, the Home Location Register (HLR) performs LRCF and LRDF functions in the home network.

In addition, AC (Authentication Center) includes mobility control logic for authentication, is invoked by the service request of other functional objects to support terminal authentication, and to obtain the user or network information required to process the mobility logic instance Or the Authentication Control Function (ACF), which interacts with other functional objects to access additional logic, stores and accesses authentication data, checks data for consistency, and hides the actual data structure from the ACF or LRCF. It performs ADF (Authentication Data Function) function that provides logical view.

In addition, SCP (Service Control Point) includes IMT-2000's overall intelligent network service control function, and service logic is invoked by service events based on events from basic call, mobility, and non-call procedures. Service Control Function (SCF) functions that interact with other functional objects to obtain service, user, and network information needed to process service logic instances or to access additional logic, and to store data related to services and networks. It performs access to SDF, checking data consistency, hiding the actual data structure and providing a logical view to the SCF.

In addition, IP (Intelligent Peripheral) is a SRF (Specialized Resource) that provides special resources required for the execution of services provided by IN (i.e., digital reception, broadcasting, conference bridges), mobile multimedia services, and special resources for packet data transmission. Function)

A wireless channel of a digital mobile communication system that performs a plurality of functions as described above may be broadly divided into a dedicated channel and a common channel, and the dedicated channel may be added to a primary channel. It is divided into a supplementary channel.

Broadband-CDMA systems can provide broadband services by adding additional bands of various sizes to the baseband.

Here, the shared channel is a channel used to send and receive access parameters with the base station when the terminal is in an idle state or to send a short message in a short time without setting up a dedicated channel. During communication by assignment, not only user data but also signaling information and system management information are transmitted through this dedicated channel, and the shared channel is not accessed for the terminal in another idle state.

Meanwhile, in the digital mobile communication system adopting the broadband-CDMA scheme, system information is provided to a terminal through a broadcast channel.

The broadcast channel is a logical channel mapped to the paging channel, and is transmitted from the base station to the mobile station (terminal) at a period of 1.28 seconds.

Thus, the mobile station obtains system information of the base station or the digital mobile communication system through the broadcast channel.

2 is a message structure diagram of each channel in a mobile communication system employing a broadband-CDMA scheme, and FIG. 3 shows an information element of a system information message existing in a broadcast channel of each channel.

That is, a system information message is transmitted through a broadcast channel, and the system information message includes information about paging channel, pilot signal detection information, access parameter, service capability, neighbor base station list, power control method, and CDMA channel. Information necessary for random access such as sponsored information is included.

As a control method for the conventional call request, the base station receives the call request of the terminal, and if the load is small in consideration of the load of the base station, the initial call request of the terminal is received. Reject the initial call request.

In this case, that is, when the call request of the initial terminal is controlled by the load of the base station, when the load of the base station is actually high, even though the call request of the terminal is denied, the call is continuously known because the terminal is not known. Will be

Therefore, when the call request is made by the terminal under a heavy load of the base station as described above, it causes a problem of actually wasting precious radio resources.

In addition, when the load of the base station is heavily loaded, there is a lot of interference with the connected call, so that the quality of service is reduced. In this case, the terminal user has to bear the deterioration of the service quality regardless of his / her will.

Accordingly, the present invention is proposed to solve the above problems of the prior art,

The present invention uses a system information message periodically transmitted to a broadcast channel, and transmits information on the network load to the system information message so that the terminal itself recognizes the network load and adjusts a network access request. An object of the present invention is to provide a method for optimizing a terminal operation of a digital mobile communication system.

Method according to the present invention for achieving the above object,

A base station classifying network load state classifying and classifying network load classes according to network load conditions;

The base station transmits the network load rating after inserting the network load rating into the system information message of the broadcast channel after transmitting the network load rating;

The terminal receiving the network load class is characterized in that it comprises a terminal control step of appropriately performing operations related to initial call request, packet transmission rate, handover decision, and call release according to the network load state.

In the above, the base station is characterized by classifying the network load class into five classes according to the state of the network load.

In addition, the network load class of the fifth grade is a "0" grade in which there is no fear of adversely affecting the system because there are very few terminals in the call, and the system is light in the base station due to the lack of radio resources in the base station due to the increase of users in the cell. Class "1" indicates that there is a risk of degrading performance, and "2" class indicates that the base station cannot maintain the quality of service for each user while the radio resource usage of users connected to the base station is increasing. As a result, the service quality of each user drastically deteriorates as the wireless resource usage of the users who are connected to the service is greatly increased, and the service can no longer be provided due to a serious error in the network. It is characterized by classifying each.

The terminal receiving the network load rating is free to make an initial call request when the network load rating is "0".

In addition, the terminal receiving the network load rating is characterized in that when the network load rating is "1" rating maintains the service as it is currently busy, users who need to request a new call with the call is pending.

In addition, the terminal receiving the network load class, when the network load class is "2", when performing a non-real-time service, such as packet services, it characterized in that the data rate is lowered and the radio resources are returned.

In addition, the terminal receiving the network load class is characterized in that when the network load class is "3", only the terminals capable of handover perform handover using the active set or the candidate set.

In addition, the terminal receiving the network load rating is characterized in that the call release when the network load rating is "4" grade.

1 is a network structure diagram of a next generation digital mobile communication system;

2 is a message structure diagram of each channel applied to the system of FIG.

FIG. 3 is a structural diagram of a system information message in the wide broadcast channel of FIG. 2;

4 is a flowchart illustrating a method for optimizing a terminal operation of a digital mobile communication system according to the present invention.

<Explanation of symbols for main parts of the drawings>

UIM: User Identity Module

MT: Mobile Terminal

BTS: Base Transceiver System

BSC: Base Station Controller

Hereinafter, a preferred embodiment of the present invention according to the technical spirit as described above are as follows.

4 is a flowchart illustrating a method for optimizing a terminal operation of a digital mobile communication system according to the present invention.

As shown therein, the base station includes: a network load state classification step of classifying network load classes into predetermined pieces according to the state of the network load; The base station transmits the network load rating after inserting the network load rating into the system information message of the broadcast channel after transmitting the network load rating; The terminal receiving the network load class includes a terminal control step of appropriately performing operations related to initial call request, packet transmission rate, handover decision, and call release according to the network load state.

In the terminal operation optimization method according to the present invention, the network load state is first detected by the base station, and the network load class is divided into five levels according to the detected network load state.

That is, the base station classifies the network load class as "0" class when there are very few terminals currently communicating in the cell and thus does not adversely affect the system performance.

In addition, if the detected network load condition is due to an increase in the number of users in the cell and the radio resources in the base station are insufficient, it may cause a slight degradation in system performance. In this case, the network load class is classified as a "1" class.

In addition, if the detected network load is connected to the base station and the base station cannot maintain the quality of service (QoS) of each user due to the rapid increase in the radio resource usage of the users who are provided with the service, there is a possibility that there is a serious adverse effect on the system performance. In this case, the net load class is divided into "2" classes.

In addition, if the detected network load is connected to a base station and the service quality of each user drops sharply due to the explosive use of radio resources of users who receive the service, in this case, the network performance may be seriously adversely affected. Classify the load into "3" classes.

In addition, if it is determined that the detected network load state is a state in which a serious error occurs in the network and no more services can be provided, call processing is not possible, so it is divided into the lowest level of "4".

After classifying the network load status in this way, the network load rating information is periodically transmitted to the terminal as system information through a broadcast channel.

Meanwhile, the terminal receiving the system information message through the broadcast channel extracts the network load class from the system information message.

In addition, according to the extracted network load class, the following operations are performed to optimize the operation state of the terminal and to maintain a very high success rate for call connection with the base station.

That is, when the received network load class is "0", the user may freely make an initial call request and request a service normally.

In addition, when the received network load class is "1" class, previously communicating users maintain the service as it is, and users who need to request a new call once withhold the call request and periodically receive the system information. To monitor.

In addition, when the received network load class is "2", terminals receiving non-real-time services, such as packet services, lower the data rate and return radio resources.

In addition, when the received network load class is "3", only terminals capable of handover perform handover using an active set or a candidate set.

In addition, when the received network load class is "4", all terminals in the cell release the call because the call processing is impossible.

Although the present invention described above has been applied to only the digital mobile communication system adopting the broadband-CDMA method, the present invention is not limited thereto, and the present invention can be applied to all mobile communication systems conforming to the IS-95 wireless access standard.

As described above, the present invention provides a network load state to the terminal by using a system information message that is periodically transmitted to the terminal, thereby providing an advantage that the network load can be increased in real time.

In addition, in most cases, since the terminal checks the network load status and processes itself, there is an advantage of reducing the network load without the service user being aware of it.

In addition, by optimizing the operation of the terminal as described above, when the network load is increased, it is possible to reduce the load of the entire network by protecting the existing call for a new call request and reducing the non-real time service data transmission rate. have.

Claims (4)

In the terminal optimization method of the digital mobile communication system, A base station classifying network load state classifying step of classifying and classifying a network load class into a predetermined number according to network load conditions; The base station transmits the network load rating after inserting the network load rating into the system information message of the broadcast channel after transmitting the network load rating; The mobile terminal receiving the network load class comprises a terminal operation optimization step of appropriately controlling operations related to initial call request, packet rate, handover decision, and call release according to the network load class. How to optimize terminal operation of the system. The method of claim 1, wherein the base station classifies the network load class into "5 grades" according to the state of the network load. The network load rating of "class 5" is based on an increase in the number of users in a cell, "0", a state in which there are very few terminals in a call, which does not adversely affect the network management system performance. The level of "1" indicates that there is a risk of light performance degradation in the system due to lack of domestic radio resources. As the usage of wireless resources of users connected to the base station is increasing, the base station can maintain the quality of service for each user. "2" class is not available, and the radio resource usage of users who are connected to the base station is increasing. Method for optimizing the operation of the terminal of the digital mobile communication system, characterized in that the state can not be provided to each of the "4" grade. The mobile terminal of claim 1, wherein the terminal that has received the network load class freely performs an initial call request when the network load class is "0", and remains in a call when the network load class is "1". Users who need to maintain the service and request a new call withhold the call request, and when the network load class is "2", when the non-real time service such as packet service is performed, the data transmission rate is lowered and the radio resource is returned. If the network load class is "3", only the terminals capable of handover perform the handover using the active set or the candidate set, and perform the operation of releasing the call when the network load class is "4". Terminal operation optimization method of a digital mobile communication system, characterized in that.