KR20030019830A - Method for paging in a CDMA mobile communication system - Google Patents

Abstract

PURPOSE: A paging method in a CDMA(Code Division Multiple Access) mobile communication system is provided to configure the second paging area with base stations surrounding the first paging area, thereby increasing the first paging success rate and reducing load. CONSTITUTION: A mobile communication system confirms whether location registration is performed(S101). If so, the system sets the first paging area with peripheral base stations on the basis of location-registered base stations(S103). The system sets the second paging area with peripheral base stations of the first paging area and the first paging area(S105). The system confirms whether a call is received(S107). If so, the system attempts paging to the set first paging area(S109). The system checks whether a mobile subscriber responds to the call(S111). If so, the system sets the call, and connects a speech path(S113). If the mobile subscriber does not respond to the call, the system attempts paging to the second paging area(S115).

Description

Method for paging in a CDMA mobile communication system

The present invention relates to a paging method in a code division multiple access (CDMA) mobile communication system. In particular, by efficiently configuring a region in which paging is performed during a mobile subscriber incoming process, the success rate of primary paging is prevented and secondary paging is prevented. A paging method in a CDMA mobile communication system to reduce the load on the system.

1 is a diagram illustrating a network configuration of a general CDMA mobile communication system.

Reference numeral 11 denotes the first mobile station, reference numeral 12 denotes the first base station (BTS # 1), reference numeral 13 denotes the first control station (BSC # 1), reference numeral 11 + N denotes the N mobile station, and reference numeral 12 + N denotes the Nth base station (BTS # N), and reference numeral 13 + N denotes the Nth control station (BSC # N).

Reference numeral 20 denotes a mobile communication exchange (MSC) including a visitor location register 21, and reference numeral 30 denotes a home location register (HLR) 30 connected to the mobile communication exchange (MSC) 20. Indicates.

In the general CDMA mobile communication system configured as described above, when a call is transmitted from the first mobile station 11, the call is connected to the first base station 12, the first control station 13, and the mobile communication exchange 20. Is sent.

In addition, the incoming call to the mobile subscriber (eg, the first mobile station) is connected to the mobile communication switch 20, the first control station 13, the first base station 12, and the first mobile station 11. The call is received.

2 is a diagram illustrating a general subscriber call processing procedure in a general CDMA mobile communication system.

In the figure, MS denotes a mobile station, BS denotes a control station, MSC denotes a mobile communication switch, BSM denotes a control station management unit, VLR denotes a visitor location register, and HLR denotes a home location register.

Mobile Paging Control (MPC) is located in NTP (Number Translation Processor), and it checks subscriber's status when requesting paging for incoming processing to mobile subscriber in CDMA system. In this case, by requesting an incoming call, it serves as a central control link between originating and incoming calls.

The MPC has the shape information of the control station and the base station (Cell) matched to the exchange, and performs the incoming processing for each LAI (Location Area Id) during paging processing, and the subscriber according to the cell / control station information during the handoff Connect it.

In more detail, when a call origination request is made from the mobile station MS # 1, a call origination request is made from the control station BS # 1 to the MSC # 1. The MSC # 1 requests outgoing subscriber information to the visitor location register VLR # 1, and the visitor location register VLR # 1 responds to the outgoing subscriber information to the MSC # 1. Next, MSC # 1 requests incoming location and call setup information to home location register (HLR), and home location register (HLR) sends incoming call setup information to incoming mobile communication exchange (MSC # N). Require. The terminating mobile communication exchange (MSC # N) transmits a response to the incoming call setup information to a home location register (HLR), and the home location register (HLR) sends the response to the incoming location and call setup information request. Transfer to communication switch (MSC # 1). The mobile communication exchange (MSC # 1) receiving the request makes an incoming call setup request to the incoming mobile communication exchange (MSC # N), and the incoming mobile communication exchange (MSC # N) is called the visitor location register (VLR # N). Ask for subscriber information. The visitor location register (VLR # N) makes a response to the incoming subscriber information request to the called mobile communication exchange (MSC # N), and the mobile communication exchange (MSC # N) receiving the response receives the control station (BS). #N) request the called party. The control station BS # N, which has been called for the called party, calls the called party, and the mobile station MS # N, which has received the call, responds to the called party called the control station BS # N. The control station BS # N receiving the response transmits a response to the called party's call request to the called mobile communication exchange MSC # N, and the receiving mobile communication exchange MSC # N receives the incoming call. Sends a response to the incoming call establishment request to the MSC # 1 requesting the setup. Upon receiving this, the MSC # 1 notifies the control station B # 1 that has requested the call to complete the call setup, and the control station BS # 1 that has been informed has received the call. (MS # 1) notifies the completion of call setup to make a call.

On the other hand, subscriber state management in the general CDMA mobile communication system as described above is shown in FIG.

Subscriber status management distinguishes whether a mobile subscriber is currently receiving mobile phone service (busy) or idle (Idle) in the CDMA system, and returns a result value when receiving a subscriber's status query from other processes. When the mobile subscriber incoming call is requested, the state of the subscriber is changed.

On the other hand, the operation of the base station information management and incoming processing request is as follows.

The mobile station call control (MPC) block is a location area (LAI) in which the mobile subscriber performs location registration (performed by the LLU block of the visitor location register processor in the CDMA system) to perform paging in the area where the subscriber exists during mobile subscriber incoming processing. It performs a control role so that the information of the base stations Equip in the Location Area Indicator can be transmitted to the control station (BSC) with reference to the database.

4 is a general subscriber location registration procedure in a general CDMA mobile communication system.

As shown, when the mobile station MS requests location registration, it receives it from the control station BSC and requests the location registration to the MSC. The MSC requesting the location registration requests the location registration to the visitor location register VLR, and the visitor location register VLR informs the home location register HLR of the location registration. Then, the home location register (HLR) transmits the subscriber information and the response to the location registration to the visitor location register (VLR), and the visited location register (VLR) received the response to the location registration request after storing the subscriber information. Transfer to the mobile communication switch (MSC). The mobile communication exchange (MSC) receiving this sends a response to the location registration request to the control station (BSC), and performs a response to the location registration request from the received control station (BSC) to the mobile station (MS). In this process, location registration is performed. In FIG. 4, reference numeral BSM denotes a control station manager.

5 is a diagram illustrating a base station location area when registering a conventional location.

When the mobile subscriber performs location registration in the area of the base station hatched in FIG. 5, the location area of the subscriber becomes the value of the displayed LAI. In addition, the primary paging is performed to all the base stations that are hatched when the incoming call processing to the subscriber.

Referring to the conventional paging method, paging may be classified into zone (LAI) unit paging, broad paging, and exchange period paging according to an execution region.

In this case, paging on a zone basis is to perform paging on location area information where a subscriber performs location registration, and broad paging is to allow paging to be performed on all base station systems existing at the current exchange. Paging performed in the current CDMA system performs zone-based paging as primary paging when requesting a mobile subscriber optical illusion, and broad paging or switching period paging is performed when there is no response from the subscriber.

6 is a diagram illustrating a LAI region for paging in a conventional CDMA mobile communication system.

As shown in Fig. 6, when the location registration information of a subscriber is located in the outer region of the LAI, such as base station 4, when the paging is attempted to this subscriber, the subscriber has already left this region and moved to another LAI region. There is a good chance that it has moved, in which case it is likely that the primary paging will fail and attempt to broadcast the second paging.

As such, although base stations in the outlying region within the range of a specific LAI are able to move out of the range of the LAI to which they belong after the subscriber registers, the completion rate of the first paging is lowered because the primary paging is attempted to the LAI region. It is lowered and the frequent attempts of secondary paging have increased the load on the system.

The MPC block is loaded into the NTP of the CDMA system, and all mobile call processing performed in the CDMA system goes through the NTP processor more than once for number translation, subscriber state management, and paging. In addition, although there may be multiple access switching processors (ASPs) for general mobile call processing and relay call processing, the NTP must process all of them in one processor. Therefore, the NTP processor load can be increased while performing tasks required by multiple ASPs. If for some complex reason the load on the NTP processor increases to a critical level, some solution is needed to control it. However, in the current system, when the MPC block is initially loaded on the NTP processor, the paging scheme is determined and cannot be changed, so there is no solution to the above problem.

That is, in the conventional CDMA mobile communication system, paging schemes are classified into primary paging and secondary paging, and when primary paging fails, secondary paging is performed, and LAI is used as primary paging. The concept of LAI is a group of specific base stations (cells), but the configuration of the LAI is not configured for each base station registered by location, but because of the fixed frame, the probability of paging failure increases.

Accordingly, the present invention has been proposed to solve various problems occurring during paging in the conventional CDMA mobile communication system.

SUMMARY OF THE INVENTION An object of the present invention is to provide a paging method in a CDMA mobile communication system that efficiently configures an area where paging is performed during a mobile subscriber incoming process, thereby increasing the success rate of primary paging and preventing secondary paging to reduce the load on the system. There is.

Paging method in a CDMA mobile communication system according to the present invention for achieving the above object,

In order to improve the LAI disadvantage operating in a fixed frame, a primary paging area is formed of neighboring base stations based on the location-registered base station.

In addition, since the subscriber is likely to remain in the paging area even after leaving the base station, the secondary paging area attempts to paging by configuring a paging area with base stations surrounding the primary paging area.

1 is a diagram illustrating a network configuration of a general CDMA mobile communication system.

2 is a diagram illustrating a general subscriber call processing procedure in a general CDMA mobile communication system.

3 is a state transition diagram of a typical mobile subscriber,

4 is a general subscriber location registration procedure in a general CDMA mobile communication system,

5 is a view showing a base station location area when the conventional location registration,

FIG. 6 is a diagram illustrating a LAI region diagram for paging in a conventional CDMA mobile communication system.

7 is a flowchart illustrating a paging method in a CDMA mobile communication system according to the present invention;

8 is a diagram illustrating a PAI region diagram for paging in the present invention.

<Explanation of symbols for the main parts of the drawings>

11 ..... MS

12 ..... Base Station (BTS)

13 ..... Control Station (BSC)

20 ..... MSC

21 ..... Visitor Locator (VLR)

30 ..... Home Location Register (HLR)

Hereinafter, described in detail with reference to the accompanying drawings, preferred embodiments of the present invention according to the technical spirit as described above.

7 is a flowchart illustrating a paging method in a CDMA mobile communication system according to the present invention.

As shown in the drawing, the step of confirming whether or not the location is registered (S101), and if the location is registered as a result of setting the primary paging area (PAI1) to the neighboring base stations around the base station is registered (S103) ), Setting a secondary paging area (PAI2) to the base stations of the primary paging area and the primary paging area (S105), checking whether the incoming call is received (S107), and setting the incoming call. Attempting paging to one primary paging area (S109), checking whether there is a response from the mobile subscriber after the first paging (S111), and if the response is a response from the mobile subscriber, sets up a call and calls And (S115) attempting to page the secondary paging area when there is no response from the mobile subscriber.

The paging method of the CDMA mobile communication system according to the present invention as described above will be described in detail with reference to FIG.

First of all, the present invention is performed in an existing mobile station paging control block (MPC block), and the paging area for each zone was previously called LAI, and this is changed to a paging area indicator (PAI). Set it.

In addition, in order to group a paging area (PAI) into neighboring base stations of a particular base station, first, the PAI area including the base station should overlap in the step of equalizing the base station. That is, the number of PAIs to which a particular base station can be registered may not be one but several.

Under this concept, the present invention checks whether or not a location is registered in step S101, and if the mobile station is registered in a specific base station as a result of the checking, the primary paging area is set to neighbor base stations around the base station registered in step S103. Set (PAI1).

As such, when base stations surrounding the base station are defined as the primary paging area in a specific base station unit, even if the subscriber leaves the base station after registering the location, the success rate of the primary paging is increased.

Next, in step S105, the secondary paging area PAI2 is set to the primary paging area PAI1 and neighboring base stations of the primary paging area.

In addition, in step S107, whether or not the call is received is checked, and when the call is received, paging is attempted to the primary paging area set in step S109. In step S111, it is checked whether there is a response from the mobile subscriber. As a result, if there is a response from the mobile subscriber, the mobile station moves to step S113 to establish a call to form a call path.

On the contrary, if there is no response from the mobile subscriber after the first paging, the mobile station proceeds to step S115 and attempts to page the secondary paging area. Here, the secondary paging area, as is well known, configures a paging area with base stations surrounding the primary paging area to attempt paging.

Here, the secondary paging area setting should be set such that the operator can actively generate and destroy the base station list.

That is, the paging area is conventionally divided into NONE, CELL, LAI, and Broadcast. However, in the present invention, the paging area is divided into NONE, CELL, PAI1, PAI2, and Broadcast.

8 is an explanatory diagram added to help understanding of the preferred embodiment of the present invention as described above.

In FIG. 8, a paging area for base station 7 is configured to correspond to a preferred embodiment of the present invention as follows.

Primary paging area: 1, 4, 6, 8, 9 base stations

Secondary paging area: Base station 5, 22, 23, 24, 25, 26, including the primary paging area.

As such, when base stations surrounding the base station are defined as the primary paging area by a specific base station unit, even if the subscriber leaves the base station after registering the location, the success rate of the primary paging is increased.

According to the above-described "paging method in a CDMA mobile communication system", since the first paging success rate can be increased, the number of secondary paging performances can be reduced, and the performance of the system can be improved and stabilized. have.

In addition, there is an advantage that can prevent the failure of the system in advance. For example, the NTP (Number Translation Processor) in a CDMA system is composed of only one, so in case of failure, the entire system can not handle mobile call, so the loss is considerably large. Since the processor handles more loads than other processors, there are many problems. However, according to the present invention, since the number of paging attempts and the probability of paging success can be increased, the processor load can be reduced and failures can be prevented. It is.

Claims (2)

In the paging method of a CDMA mobile communication system, Confirming whether or not the location is registered, and if the location is registered, setting the primary paging area PAI1 to neighbor base stations centered on the location-registered base station; Setting a secondary paging area (PAI2) to neighbor base stations of the primary paging area and the primary paging area; Checking whether the call is received and attempting to page the set first paging area when the call is received; Checking whether there is a response from the mobile subscriber after the first paging, and if there is a response from the mobile subscriber, establishing a call and connecting a call path; And if there is no response from the mobile subscriber after the first paging, attempting to page the set secondary paging area (PAI2). The paging method of claim 1, wherein the secondary paging area is set by the operator by actively creating and destroying the base station list.