KR20040075232A - Priority call establishing method by reserving system resorce - Google Patents

Abstract

PURPOSE: A method for connecting a preferential call by reserving system resources is provided to preferentially connect a call of a specific subscriber registered in a system even when traffic is congested. CONSTITUTION: After system resources are reserved(S200), a mobile terminal for a preferential call is registered in a base station(S210). When a call is attempted by the mobile terminal(S220), the base station checks whether the mobile terminal has been registered for a preferential call connection(S230). If the mobile terminal has been registered for a preferential call connection, the base station allocates reserved system resources(S240).

Description

Priority call connection method by system resource reservation {PRIORITY CALL ESTABLISHING METHOD BY RESERVING SYSTEM RESORCE}

The present invention relates to a call connection method in a mobile communication system, and more particularly, to a method of preferentially connecting a call by a base station system resource reservation.

The basic concept of cellular mobile communication was proposed by Bell Labs in the 1940's, and the actual commercial service was rapidly developed in 1983 with the launch of Advanced Mobile Phone Service (AMPS) in the United States. This analog AMPS is called first generation mobile communication.

The Code Division Multiple Access (CDMA) mobile communication system uses a global positioning system (GPS) at the base station, and the North American-oriented synchronous method in which all base stations and terminals operate in time, and the European-oriented asynchronous method that does not use GPS at the base station. There is a way.

Synchronous mobile communication methods are classified into CDMAONE which is 2G (Generation) generation and CDMA2000 which is 3G IMT-2000 series.

Synchronous CDMA that defines IS-2000 as the basis is CDMA2000 1X and CDMA2000 3X. The CDMA2000 1X uses a single 1.25MHz frequency width, just like the existing IS-95, while the CDMA2000 3X uses up to three existing IS-95 frequency widths.

Currently, resources used for voice and data call services in a CDMA2000 1X system include base station power, channel elements, and Walsh codes, and all subscribers are provided with the same quality of service (QoS).

However, in some cases, it may be necessary to provide preferential services for a particular subscriber. In this case, even in a situation where base station resources are scarce, subscribers requiring special management may not be able to receive services in the same way as general subscribers due to a lack of base station resources. Will occur. For example, at the same time, even in an accident place where a call is congested, even a lifeguard or a person with a disability who needs to call first may not be able to make a call and serious damage may occur.

SUMMARY OF THE INVENTION The present invention has been made to solve such a problem in the related art, and an object of the present invention is to provide a method for providing a certain level of QoS to a specific subscriber even when a base station resource shortage occurs in a mobile communication system. .

1 is a diagram illustrating an embodiment of a system for performing a priority call connection method based on a system resource reservation according to the present invention.

2 is a flowchart of an embodiment of a method for priority call connection by system resource reservation according to the present invention;

3 is a table showing one embodiment of the configuration of a channel element according to the present invention;

Figure 4 is a table showing an embodiment of the configuration of Walsh according to the present invention.

* Description of symbols on the main parts of the drawings *

100: mobile communication terminal 110: base station

120: control station 130: base station manager

In order to achieve the above object, the preferred call connection method according to the system resource reservation according to the present invention, when receiving a call request from the mobile communication terminal, the step of confirming whether to subscribe to the preferred call connection service of the mobile communication terminal; And allocating system resources reserved for priority call connection to the mobile communication terminal when the mobile communication terminal is subscribed to the priority call connection service.

The reserved system resource may be any one or more of a base station power, a channel element, and a Walsh, and may be configured in the base station. The mobile communication terminal to be connected to the first call may be registered in the base station.

According to the present invention, the base station reserves a system resource set by an operator for a subscriber registered in the system, and then changes the call processing algorithm to allocate a reserved resource to a specific subscriber's call connection. Is done. This call connection applies to both the initial attempt and the handoff.

Even in a traffic congestion due to such a service, mobile communication terminals subscribed to a call connection service are successfully allocated by allocating reserved system resources.

Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings.

1 is a diagram illustrating an embodiment of a system for performing a priority call connection method based on a system resource reservation according to the present invention. In FIG. 1, the mobile communication terminal 100 is connected to a base transceiver system (BTS) 110 through a wireless section, and the base station 110 includes a control station (BSC; Base Station Controller) 120 and a control station ( 120 is connected to a base station manager (BSM) 130, respectively.

The control station 110 is a system for controlling and managing one or more base stations, and exchanges messages with the base station 110 and an exchange (not shown). Some signaling messages may just pass through the control station. In the present embodiment, the reserved system resources and registered subscriber mobile communication terminal 100 information are transmitted to the base station through the base station manager 130.

The base station 110 interworks with the control station 120 and amplifies the baseband signal and transmits the signal to the CDMA frequency band. In the present embodiment, the reserved system resources are allocated to the registered subscriber mobile communication terminal (100).

The base station manager 130 manages the base station 110 by the operation of the system operator. In the present embodiment, the reservation of system resources and registration of the subscriber mobile communication terminal 100 are performed by the operator through the base station manager 130 to the base station. Registration of the subscriber mobile communication terminal 100 may be registered in the base station of the entire mobile communication system through a home location register (HLR).

2 is a flowchart of an embodiment of a method for priority call connection by system resource reservation according to the present invention.

First, system resources are reserved (S200). System resources are one or more of base station power, channel elements and Walsh, which operators of the system reserve through the base station manager 130.

In the case of power, the operator can adjust the base station power from 0 to 100% by adjusting parameters in the base station manager. Typically, mobile operators use about 95% of base station power to protect the system from overload.

The total power in one sector 1FA at the base station is the sum of pilot power, call power, synchronous power, power for general subscriber traffic, and reserve power for system protection, and each power constituting the total power of the base station can be changed by the system operator. .

If the system operator sets the total power to 95% of the maximum power, it allocates power for pilot, call, and synchronization within 95% and the general subscribers for the rest.

For example, on a Samsung 1X system, the maximum assignable power per subcell is 7530, which is a relative value of 100%. When the 1X terminal goes to an area where the radio wave environment is bad, it constantly requests high power from the base station. Domestic mobile carriers use maximum power per subscriber for subscriber service at 798. In this case, when more than 7 subscribers are located in poor radio environment, base station transmission power is limited, preventing call allocation. do.

In case of such a case, a call can be allocated even when a specific power is allocated to specific terminals and a call cannot be allocated to a general terminal. Preferably 5% (variable) power for AMP protection may be reserved for specific terminals.

Registered terminals can be reserved for power within a specific FA by changing parameters of the operator in the base station manager (BSM) 130, and the corresponding power reservation function can be reserved for each voice call and data call. The possible power is adjustable by the operator. Power allocation applies equally to handoff.

Channel element and Walsh allocation methods will be described later with reference to FIGS. 3 and 4, respectively.

The number of system resources reserved, that is, the subscriber, that is, the mobile communication terminal to which the first call is connected, is registered with the base station (S210). The registration of the subscriber who applied for subscription to the mobile telecommunication company is registered as the base station 110 through the control station 120 in the base station manager 130.

After a system resource is reserved and a subscriber is registered, when a call is attempted from the mobile communication terminal 100 (S220), the base station 110 checks whether or not to register the priority call connection of the mobile communication terminal 100 which attempted the call (S230). ). As a result of the check, when the mobile communication terminal 100 registers a priority call connection, the base station allocates a reserved system resource (S240) and communicates the call through the reserved system resource. Proceed with the call connection procedure.

Figure 3 is a table showing an embodiment of the configuration of the channel element according to the present invention. It can be seen from the table that six channel elements are allocated to each MDSP.

Channel elements per MDSP can be assigned a call up to 3FA in the case of the Omni base station. If a call is already assigned from 1 to 3FA, a call will fail if the 4FA or more attempt is attempted and the call will not be made even in an emergency.

In the case of a sector base station (not shown), only 6 FAs can be allocated to 6 channel elements per MDSP. In this case, if a specific call is already assigned in the MDSP, a failure occurs when another FA call is attempted, and a call may not be made even in an emergency situation.

In this case, as shown in the table, the operator first analyzes the traffic trend of the call connection subscriber and blocks the channel element by MDSP and reserves it for emergency use. 3 illustrates an embodiment in which MDSP # 8 is blocked.

Channel element reservation can be reserved for both voice and data calls, and the number of channel elements that can be reserved can be adjusted by the operator for each MDSP. Channel element reservation is equally applied to handoff.

Figure 4 is a table showing an embodiment of the configuration of Walsh according to the present invention. In general, Walsh code 0 is used for pilot channels, 1 for calls, 32 for sync channels, and the remaining 61 codes are reserved for general subscribers. In this case, one code is required for voice call / incoming call and handoff, and 16 codes are required for data call attempts to speed up to 153.6kbps.

Due to the increase in traffic, if all Walsh are in use, call processing is not possible due to lack of Walsh resources. In this case, a specific Walsh can be reserved for specific terminals and the terminal can be appealed.

The Walsh used for voice requires only one Walsh per issue, so reserve the required number of Walsh in Tree # 0, and the Walsh used for data requires up to 16 Walsh, so either Tree # 1 or Tree # 3 You can use one or two Trees. 4 shows an embodiment in which Tree # 3 is reserved.

Walsh to reserve for data call processing reserves two of the four-bit Walsh overheads that are not allocated overhead to provide maximum throughput per subscriber, and to the Walsh tree with overhead for voice call processing. Walsh reservations apply equally to handoffs.

In this way, the mobile communication terminals that require special management may be allocated to system resources that are reserved in advance to make a call connection.

According to the present invention, in a CDMA2000 1X access network system, even when traffic is congested, a specific subscriber registered in the system can be connected to a call to realize a high quality service of the access network.

Although the invention has been described in terms of some embodiments, the scope of the invention is not limited thereto but will also vary upon its modifications or improvements as supported by the claims.

Claims (4)

When receiving a call request from a mobile communication terminal, checking whether the mobile communication terminal subscribes to a priority call connection service; And Allocating system resources reserved for priority call connection to the mobile communication terminal when the mobile communication terminal is subscribed to the priority call connection service. 2. The method of claim 1, wherein the reserved system resources are any one or more of base station power, channel elements, and Walsh. The method of claim 1, wherein the reserved system resources are set in the base station. The method of claim 1, wherein the mobile communication terminal to be connected to the first call is registered with the base station.