KR100441268B1 - Method for searching no call subcell in cdma system - Google Patents

Abstract

The present invention relates to a method for searching a non-call subcell by a base station management apparatus of a code division multiple access (CDMA) system, the method comprising: monitoring a traffic state of a base station managed by the base station management apparatus; Collecting a call processing message, searching for an omni-directional call subcell for a predetermined time with reference to the collected call processing message for each subcell, and searching for an omni-directional non-call subcell for the predetermined time. Tracking and analyzing the state of the non-call subcell of the base station; searching for the reverse non-talk subcell for a predetermined time by referring to the collected call processing message for each subcell; When the subcell is found, the process of tracking and analyzing the state of the non-call subcell of the base station and the call type for the non-call subcell The present invention provides a method of searching for a non-call subcell in a CDMA system, which comprises a process of outputting a result of analysis of a star.

Description

How to search for non-call subcell in CDMA system {METHOD FOR SEARCHING NO CALL SUBCELL IN CDMA SYSTEM}

The present invention relates to a CDMA system, and more particularly, to a method for searching for a subcell that looks normal in a base station state but does not have a call volume.

Representative components of a CDMA system include a mobile station (MS), a base station (BS), and a mobile switching center (MSC). The mobile station, the base station, and the exchange are connected to each other by a call line and a data link. The CDMA system of this connection structure uses a pair of transmit and receive radio channels when each mobile station makes a call, but the channel is fixed to a specific frequency channel. It can be changed to another channel according to the movement of the terminal even during a call, so that a call can be made to any channel if the channel is allocated to the region. Here, the base station is connected to the exchange so that the mobile station can make a call with the other party, and the exchange processes a call and a call at each base station, and trunks together with a central control function so that all base stations can be efficiently operated. It is connected to the switch of the Public Switching Telephone Network (PSTN) via a trunk line.

The voice service or data service provided by such a CDMA system can enable a call to be made at a desired place when a customer (mobile station terminal customer) desires. However, customer complaints will occur if the service is not provided smoothly. From the manager's point of view, the customer complains that the call is not possible even if there is no visible obstacle in the base station. If you manage a large number of base stations and do not have a call service regardless of the failure of the base station, it is difficult for the administrator. The reason for this is that the base station state may be normal, but a subcell without a call volume may occur. However, in the conventional CDMA system, the base station state is normal, but there is a problem in that it is unable to adequately cope with the customer complaint because it cannot search the subcell without the call volume.

Accordingly, an object of the present invention is to find a non-call subcell search method in a CDMA system capable of searching for a subcell that is not serviced by a base station configured in a CDMA system regardless of a failure in order to properly deal with a customer complaint about the base station. In providing.

1 is a diagram showing the configuration of a CDMA system to which the present invention is applied;

2 is a diagram illustrating a traffic channel call processing procedure to which the present invention is applied;

3 is a diagram illustrating a traffic channel transition process to which the present invention is applied;

4 is a diagram illustrating an example of service negotiation starting from a terminal to which the present invention is applied;

5 is a diagram illustrating a base station cell and a sector service area to which the present invention is applied;

6 is a diagram showing the internal configuration of a base station management apparatus according to an embodiment of the present invention;

7 is a control flowchart for searching for a non-call subcell in a base station management apparatus according to an exemplary embodiment of the present invention.

Explanation of symbols on the main parts of the drawings

10: mobile station (MS) 100: base station transmitter (BTS)

200: base station controller (BSC) 300: base station management apparatus (BSM)

400: exchanger (MSC) 500: home location register (HLR)

600: Visitor Location Register (VLR) 700: Public Telephone Network (PSTN)

In order to solve the above object, a method for searching a non-call subcell in a base station management apparatus of a code division multiple access (CDMA) system according to the present invention includes: monitoring a traffic state of a base station managed by the base station management apparatus; Collecting a subcell decode processing message of the base station; searching for an omnidirectional non-calling subcell for a predetermined time with reference to the collected subcell decode processing message; Searching and analyzing the state of the non-call subcell of the base station when the subcell is searched, searching for the reverse call-free subcell for a predetermined time by referring to the collected call processing message for each subcell, and Tracking and analyzing a state of the non-call subcell of the base station when the reverse non-call subcell is searched for a predetermined time; It characterized by the step of outputting the arc constituted by any type of analysis of the call sub-cells.

In addition, if the omni-directional non-call subcell is not searched for the predetermined time, searching for a backward non-call subcell for a predetermined time by referring to the collected call processing message for each subcell, and calling the call-free subcell. Setting a unit time to output an analysis result for each type, counting the non-talk subcell output cycle, and outputting a call type analysis result for the non-call subcell for each time slot when the talk-free subcell output cycle is reached It is characterized by further comprising the process.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings. First of all, in adding reference numerals to the components of each drawing, it should be noted that the same components have the same reference numerals as much as possible even if they are displayed on different drawings. Detailed descriptions of well-known functions and configurations that are determined to unnecessarily obscure the subject matter of the present invention will be omitted.

1 is a diagram showing the configuration of a CDMA system to which the present invention is applied.

The CDMA system illustrated in FIG. 1 includes a mobile station (MS) 10, a base station transceiver (BTS) 100, a base station controller (BSC) 200, and a base station manager (Base Station Manager). (300), Mobile Switching Center (MSC) 400, Home Location Register (HLR) 500, Visitor Location Register (VLR) 600, and Public Switched PSDN Telephone Network (700). In addition, the CDMA system may further include a configuration form of a message center (MC), a server (Server), a cell broadcasting center (CBC), a DCN, a gateway (G / W), a wireless application protocol (WAP) gateway, and an IP. have.

The mobile station 10, the base station transmitter 100, the base station controller 200, and the exchange 400 are connected to each other by a call line and a data link, and the CDMA system having such a connection structure allows each mobile station 10 to communicate. When using a pair of transmit / receive wireless channels, the channel is not fixed to any specific frequency channel and can be changed to another channel according to the movement of the terminal during a call, so any channel assigned to the region can make a call to any channel. do.

The mobile station 10 is composed of a radio transceiver, an antenna, and a control device to perform a voice service and a packet data service while moving.

The base station transmitter 100 includes a cell controller, a channel device CE, and a wireless transceiver (RF), and a plurality of base station transmitters are operated in one exchange according to a call environment. The cell controller of the base station transmitter 100 includes a memory and a processing circuit for controlling the overall operation of the base station transmitter 100 and executing an operation program communicating with the base station controller 200. Under normal conditions, the cell controller commands the operation of the channel element, and the channel element includes a plurality of channel elements. Under normal conditions, the cell controller instructs the operation of the channel element including a plurality of channel elements including representative channel elements for performing bidirectional communication in the forward and reverse channels. Here, the 'forward' channel refers to an outbound signal from the base station to the mobile station, and the 'reverse' channel refers to an inbound signal from the mobile station to the base station. I mean. The channel element also operates in accordance with a code division multiple access (CDMA) protocol, for example with a mobile station in a cell.

Although not shown, the antenna transmits an omni-directional channel signal received from the RF transceiver to the mobile station within the coverage area of the base station. The antenna also sends a reverse channel signal received from the mobile station within the coverage area of the base station to the RF transceiver.

The base station controller 200 is a device for operating a wireless communication resource, which is connected to the base station transmitter 100 for a predetermined cell within a wireless communication network to operate a resource at a cell site.

The base stations 100 and 200 transmit voice and data signals to the PSTN 700 through the communication line and the switch 400.

The base station management device 300 is responsible for the maintenance of the base station, according to the present invention monitors the base station traffic conditions, if a non-call subcell for the forward or reverse direction occurs for a predetermined time and analyzes the result by call type and the result Print in minutes, hours, days, and weeks.

The switch 400 is composed of a connection with each base station controller 200, information and authentication for the subscriber, and related additional equipment, and plays a role of forming a connection with another network. In addition, the exchange 400 handles calls and calls from each base station 100, and through the trunk line (Trunk Line) with a central control function so that all the base stations 100 can be efficiently operated ( 700) can be connected to the exchange, and consists of the control unit, call path and peripherals, and also has the function of collecting billing data for the maintenance and call complete. The exchange 400 performs location registration of the mobile station 10 in association with the HLR 500 and the VLR 600.

FIG. 2 is a diagram illustrating a traffic channel call processing procedure to which the present invention is applied. As shown in FIG. 2, a mobile station entering (A01) from a system access step may have a corresponding traffic in a traffic channel initialization substep (A02). Go to the channel (specific Walsh code) and receive the message. Once initialization is complete, the mobile station is ready to receive system messages, such as alerting related messages.

The system sends a "Alerting" message to the mobile station and enters the call state when the user answers (A03). When the user presses "END" or completes the call after completing the call, the user exchanges the "Release Order" (A04). When this is completed, the terminal restarts from the initialization process (A05).

The overall call processing state of the traffic channel will be described in detail for each substep with reference to FIG. 2 as follows.

The traffic channel initialization substep A02 begins to receive the forward traffic channel and sends a reverse traffic channel. It also performs registration, "Acknowledgement" procedures, power control, and initialization and processing of service options.

The traffic channel sub-step A03 may be divided into a state waiting for a request, a state waiting for an answer of a mobile station, and a conversation state. The waiting state for waiting for a request is a step in which a mobile station waits for a message having "Alerting" information, and a waiting state for a mobile station is a step in which a user responds using a button, and a call state is a step in which a call is actually made. And multiplexing mode.

Release sub-step A04 is a disconnected state. Subsequently, in the CDMA system, the timing of the mobile station may be displaced during the call process, so that the call is always restarted after the call is completed to reset it (A05).

3 is a diagram illustrating a traffic channel transition process to which the present invention is applied, and shows a procedure for starting and ending a call from an initialization process for a call by a mobile station. The process from the call to the completion of the traffic channel connection using a general page message (hereinafter, referred to as 'GPM') in the base station will be described in detail with reference to FIG. 3.

As shown, when the base station 100 transmits (B01) a GPM to the mobile station 10, the mobile station responds with a page response message (PRM) (B02). At this time, the base station 100 transmits an extended channel assignment message (hereinafter, abbreviated as 'ECAM') so that the mobile station 10 enters the traffic channel. At this time, the base station 100 starts to send null traffic to the corresponding Walsh code (B03).

The mobile station starts to transmit (B04) a preamble in the traffic state with the traffic channel information included in the ECAM. The base station 100 responds with a base station " ACK " (B05). From this time, the mobile station 10 transmits null traffic and prepares to transmit / receive actual traffic (B06 and B07). Service negotiation may be performed in the traffic state.

After this process, the base station 100 transmits an Alert With Information (AWI) message (B08) so that the mobile station 10 becomes "Alerting". Accordingly, a call is performed (B10), and then a release request is made between the mobile station 10 and the base station 100 according to the call termination (B11, B12).

FIG. 4 is a diagram illustrating an example of service negotiation starting from a terminal to which the present invention is applied, and service negotiation (hereinafter referred to as 'SN') in the traffic state of FIG. 3 is referred to as a base station 100. The service configuration between the mobile station and the mobile station 10 refers to negotiation between the mobile station and the system.

Service Cofiguration includes forward / reverse multiplexing option, forward / reverse transmission rate, service option connection (SO reference), service option (SO), and forward / reverse traffic type (3). It consists of three elements.

Service negotiation requires service request message, service response message, service connection message, and service connection completion message.

As shown in FIG. 4, the mobile station 10 attempts to connect to the base station 100 by a call by transmitting a PRM in response to the origination message from the base station 100 and the response of the GPM (C02). At this time, when the normal condition is reached, the base station 100 transmits the ECAM (C03) to enter the mobile station 10 into the traffic state. Service negotiation is performed in the traffic state (C05-C07).

FIG. 5 is a diagram illustrating a base station cell and a sector service area to which the present invention is applied. Each hexagon represents a division of an area 900 that is controlled by one pilot channel, and a division of a center hexagon ( A, B, and C indicate that each pilot channel is provided according to an area 903 serving for each sector, assuming that there are three sectors in one cell.

Here, the pilot channel is a channel W0 to which a Walsh code is not applied, and is a channel for distinguishing each base station by a short PN offset by applying only a short Pseudo random noise code.

6 is a diagram illustrating an internal configuration of a base station management apparatus according to a preferred embodiment of the present invention. In the CDMA system according to the present invention, the base station management apparatus 300 for performing a non-call subcell searching method includes an input / output interface 310, a message collecting unit 320, a searching and analyzing unit 330, and an outputting unit ( 340, a controller 350, a database 370, and a timer 360.

The input / output interface 310 receives signal input / output from connected CDMA system components, such as the switch 400, the base station transmitter 100, the base station controller 200, and the home location register 500. In charge.

The message collecting unit 320 collects only call processing messages for each base station subcell among signals from each component of the system collected through the input / output interface 310.

The search and analysis unit 330 searches the omni-directional non-calling subcell for a predetermined time from various information included in the call processing message for each subcell collected through the message collecting unit 320, and among them, the base station of the corresponding base station Track and analyze status for call subcells.

In addition, the search and analysis unit 330 analyzes the subcell state based on the non-call subcell state information of the corresponding base station, and extracts the call type analysis result for the non-call subcell to be output for each time zone. .

The output unit 340 outputs a call type analysis result for the non-call subcell analyzed by the search and analysis unit 330 according to a predetermined output format (minute, hour, daily, weekly, etc.). do.

The control unit 350 monitors the state of various system components connected to the base station management apparatus 300 according to the present invention, and the input / output interface 310, the message collection unit 320, and the search and analysis unit 330. In addition, the output unit 340 is connected to the timer 360 and the database 370 to control the operation of each component. In particular, the control unit 350 includes, in the database 370, a program required for control of each component of the system, non-call subcell search information according to the present invention, state tracking and analysis information for the non-call subcell of each base station, Analysis result information and output information for each call type for the non-call subcell is stored, and the call type analysis result for the non-call subcell for each time zone is automatically generated according to the output period of the non-call subcell measured by the timer 360. Control to output time zone.

7 is a control flowchart for searching for a non-call subcell by a base station management apparatus according to an exemplary embodiment of the present invention. Hereinafter, a method of searching for a non-call subcell in a CDMA system according to an exemplary embodiment of the present invention will be described in detail with reference to FIGS. 6 and 7.

In a method of searching for a non-call subcell in a base station management apparatus of a CDMA system according to an exemplary embodiment of the present invention, in step 801 of FIG. 7, the control unit 350 of FIG. The traffic state of the base station managed by 300 is monitored. In step 803, the message collecting unit 320 is controlled to collect a call processing message for each base station subcell.

The controller 350 controls the search and analysis unit 330 in step 805 with reference to the call processing message for each subcell collected in step 803 to search for omnidirectional sub-calls for a predetermined time. When the omni-directional talk subcell is searched for the predetermined time, the controller 350 tracks and analyzes the state of the talk-free subcell of the base station. The controller 350 proceeds to step 809 and 813.

First, the controller 350 proceeds to step 813 and outputs a call type analysis result for the non-call subcell. In addition, the control unit 350 proceeds to step 809 to search for the reverse non-call subcell for a predetermined time with reference to the collected sub-cell call processing message, and if the reverse non-call subcell is searched for the predetermined time, the corresponding base station. After tracking and analyzing the state of the non-call subcell of the UE, the process proceeds to step 813.

The control unit 350 outputs a call type analysis result for the non-call subcell and sets a unit time for outputting a call type analysis result for the non-call subcell in step 813. Count the output cycle. Accordingly, when the call-free subcell output period is reached, the call type analysis result for the call-free subcell is analyzed and output for each time zone such as minutes, hours, days, weeks, and the like. The call type analysis is analyzed for originating, incoming and two-way calls respectively.

On the other hand, if the omnidirectional non-call subcell is not detected for a predetermined time in step 805, the controller 350 proceeds to step 809 and refers to the non-call subcell for a predetermined time with reference to the collected call processing message for each subcell. To search.

On the other hand, in the detailed description of the present invention has been described with reference to specific embodiments, of course, various modifications are possible without departing from the scope of the invention. Therefore, the scope of the present invention should not be limited to the described embodiments, but should be defined not only by the scope of the following claims, but also by the equivalents of the claims.

As described above, the present invention provides a method for searching a non-call subcell in a CDMA system capable of searching for a subcell that is not serviced by a base station configured in a CDMA system regardless of a failure. There is an advantage that you can properly respond to customer complaints by searching for subcells that do not have visible or call volume.

Claims (3)

A method for searching for a non-call subcell by a base station management apparatus of a code division multiple access (CDMA) system, Monitoring a traffic state of a base station managed by the base station management apparatus; Collecting a call processing message for each subcell of the base station; Searching for an omnidirectional non-calling subcell for a predetermined time by referring to the collected call processing message for each subcell; Tracking and analyzing the state of the non-call subcell of the base station when the omni-directional call subcell is searched for the predetermined time; Searching for a reverse non-call subcell for a predetermined time by referring to the collected call processing message for each subcell; Tracking and analyzing a state of the non-call subcell of the base station when the reverse non-call subcell is searched for the predetermined time; And a method of outputting a call type analysis result for the non-call subcells. The method of claim 1, If the omni-directional non-call subcell is not searched for the predetermined time, the method further comprises searching for a backward non-call subcell for a predetermined time by referring to the collected call processing message for each subcell. Call subcell search method. The method of claim 1, Setting a unit time for outputting a call type analysis result for the non-call subcell and counting the output period of the non-call subcell; And if the call-free subcell output period is reached, outputting a call type analysis result for the call-free subcell according to time slots.