KR100335144B1 - Method for call processing of Wireless local loop terminal - Google Patents

Abstract

The present invention relates to a wireless subscriber network, and more particularly, to a call processing method of a wireless subscriber network terminal which is suitable for restricting mobile services of a terminal in a wireless subscriber network based on a code division multiple access (CDMA) scheme. The call processing method of the wireless subscriber network terminal according to the present invention includes the steps of the terminal transmitting its own location information to the base station upon initial synchronization with the base station, and the base station is already registered with the location information transmitted from the terminal Comparing the location information of the mobile terminal with the same location information; and if the transmitted location information is different from the location information already registered, releasing the call connection to the terminal. Since it does not support the mobility of the WLL terminal, it is possible to reduce service operation costs of service providers and to predict and adjust the call volume.

Description

Method for call processing of wireless subscriber network terminal {Method for call processing of Wireless local loop terminal}

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a wireless local loop (hereinafter abbreviated as WLL), and more particularly to a wireless subscription network suitable for restricting mobile services of a terminal in a wireless subscriber network based on code division multiple access (CDMA). A call processing method of a self network terminal.

In general, a wireless subscriber network system is a technology that provides a subscriber line (wireless) wirelessly to provide voice, fax, and data services by connecting a telephone company and a home or office wirelessly rather than wired.

1 is a view showing the configuration of a general WLL system.

Referring to FIG. 1, a subscriber access device 20 connected to an integrated WLL terminal 30 or a detachable WLL terminal 10, a detachable WLL terminal 10, and connected to a base station 40 on a wireless interface, and a subscriber connection. A base station 40 for wirelessly connecting to the apparatus 20 to connect a call, a base station controller 50 for controlling the base station 40, and an operating device 60 for operating and maintaining the WLL system. do. Reference numerals not described here denote the switching center 70.

Since the WLL system configured as described above operates using the CDMA scheme, the call processing procedure proceeds according to the same protocol as the CDMA system.

2 is a signal flow diagram illustrating a call processing procedure of a conventional CDMA system.

Referring to Fig. 2, the call processing procedure shown in Fig. 2 is a signal flowchart at the time of call processing according to the call of the mobile station.

First, a channel used in a CDMA system will be described. In the CDMA system, a sync channel, a paging channel, an access channel, and a communication channel are used.

Here, the sync channel is used in the system acquisition step as a forward channel, and the mobile station is provided with system parameters, the system time, the pilot PN sequence time of the base station, the data rate of the call channel, and the like in the sync channel message transmitted through the sync channel.

The call channel transmits information such as overhead, call command and channel allocation from the base station to the mobile station, and the access channel is a channel through which communication is performed between the mobile station and the base station when the mobile station is not using the call channel. Thus, one or more access channels are transmitted in pairs with all call channels, each access channel being distinguished by a different long PN code.

The base station therefore responds via a call channel message to the signal of a particular access channel, and the mobile station responds to the call channel message as an access channel message.

Then, the call processing procedure of the CDMA system using the aforementioned channels is as follows.

First, when the user presses the 'call' button with the other party's telephone number, the mobile station transmits an outgoing message to the base station through the access channel (S201). The base station receiving the outgoing message transmits the channel assignment message through the call channel to set up the call channel (S202), and the mobile station starts traffic transmission through the reverse call channel (S203). At this time, the base station initializes the call channel by transmitting a base station confirmation command through the forward call channel (S204).

Subsequently, the base station and the mobile station determine the selection through the forward and reverse communication channels, and transmit an alert message to generate a ring back tone (S205 to S208).

On the other hand, after the call channel is completely initialized, the mobile station uses a long personal code to maintain communication complement and the base station performs the mobile station's authentication procedure.

As described above, in a CDMA system, a call is allocated by a protocol for each channel. When a mobile station moves, a call is allocated through a registration process with a base station.

Herein, the registration process will be described in more detail. When the mobile station moves from one area to another, the mobile station and the corresponding exchange station select autonomous registration method during the registration process and adjust several parameters accordingly. Inform the mobile station of the relevant parameters via a system parameter message.

Then, the mobile station and the corresponding switching station manage the list of regions recently registered by the mobile station, and when the mobile station moves to a new region that is not in the currently registered list, the mobile station performs automatic registration with the base station.

Subsequently, the mobile station and the corresponding exchange station add a new region to the list when the registration is completed, set a new timer time for all existing regions, and delete the currently registered regions from the list when the timer time is completed.

In this case, because a list of regional information is stored in the list managed by the mobile station and the corresponding switching center, the CDMA system can prevent a plurality of registrations at the boundary between the regions, and by setting a new timer time for the existing region, the corresponding switching center is called. Signaling eliminates the need for verification of existing areas.

The call processing procedure of the CDMA system described so far can be applied to the WLL system, and when the call processing procedure of the CDMA system is applied to the WLL terminal and the base station, the operation according to the above can be represented as shown in FIGS. 3 to 4.

Referring to FIG. 3, the WLL terminal powers on or transitions to a system decision substate S302 from another state S301, and starts operation in an analog mode in the system decision substate S302. The call processing procedure is performed through the initial task (S303). Subsequently, the call is allocated from the base station through the pilot channel acquisition substate (S304), the synchronization channel acquisition substate (S305), and the time change substate (S306) according to the call processing procedure.

Referring to FIG. 4, the base station processes a pilot channel, a synchronization channel, a call channel, an access channel, and a call channel according to a call processing procedure and connects a call to a WLL terminal (S400 to S404).

However, considering the case where the call processing and registration process of the CDMA system is applied to the WLL system as described above, the WLL terminals are not provided with mobility and only a communication service is provided at a certain place. Not suitable for application

In the service provider's view, when a fixed WLL terminal moves and requests a call, the service provider of the WLL system applying the call processing protocol of the conventional CDMA system provides a mobile communication service to the WLL terminal and accordingly costs This increases the problem that the subscriber's call volume can not be managed.

Accordingly, an object of the present invention is to provide a call processing method of a wireless subscriber network terminal that automatically controls a call so as to restrict a mobile service to a WLL terminal. It is for.

According to an aspect of the present invention for achieving the above object, the terminal transmits its location information to the base station during the initial synchronization with the base station, the base station is already registered with the location information transmitted from the terminal And comparing the location information of the terminal with the same location information, and releasing the call connection to the terminal if the transmitted location information and the location information already registered are different from each other.

1 is a view showing the configuration of a general WLL system.

2 is a signal flow diagram illustrating a call processing procedure of a conventional CDMA system.

3 is a flowchart illustrating a call processing procedure of a WLL terminal to which the call processing procedure illustrated in FIG. 2 is applied.

4 is a flowchart illustrating a call processing procedure of a base station to which the call processing procedure shown in FIG. 2 is applied.

5 is a flowchart illustrating a call processing procedure of a WLL terminal according to the present invention.

6 is a flowchart illustrating a call processing procedure of a base station according to the present invention.

Hereinafter, a configuration and an operation according to an exemplary embodiment of the present invention will be described with reference to the accompanying drawings.

The present invention proposes a call processing method of a WLL terminal that automatically limits a call of the WLL terminal when the WLL terminal attempts to make a call in a new area out of a predetermined area.

To this end, in the base station according to the present invention, the initial synchronization with the WLL terminal determines whether the location and subscriber information of the WLL terminal included in the synchronization signal between the WLL terminal and the base station match the location and subscriber information of the WLL terminal already registered. Check and determine whether to connect to the WLL terminal accordingly.

Accordingly, the WLL terminal transmits its subscriber information (MIN1, MIN2, ESN) to the base station in the system synchronization phase with the initial base station, and the base station compares the subscriber information transmitted from the WLL terminal with the registered subscriber information. The call connection with the WLL terminal is determined.

Here, the base station sets a predetermined range as a reference value, and limits the call of the WLL terminal when the difference between the location information transmitted from the WLL terminal and the location information already registered exceeds the predetermined range. At this time, when the WLL terminal does not exceed a predetermined range set as a reference value, that is, when there is not much mobility, the base station transmits its location information to the WLL terminal through system parameters so that the WLL terminal has the latest location information.

Meanwhile, the call processing method according to the present invention can be applied to both an integrated WLL terminal and a separate WLL terminal. Therefore, in the present invention, both the integrated WLL terminal and the separate WLL terminal will be collectively referred to as WLL terminals.

Prior to describing the call processing process of the WLL terminal according to the present invention, the registration process used in the CDMA system will be described in more detail.

In the CDMA system, the registration process is a process in which the mobile station informs the base station of the mobile station. The base station can efficiently manage the location of the mobile station through the registration process and provide a call service accordingly. Here, the mobile station reports its identification number (MIN), calling channel slot, latitude, longitude information, etc. currently being used to the base station through the registration process.

This registration process can be performed in the following eight ways.

① Power operation registration: It is executed when the mobile station is turned on, when another system or analog system is switched to CDMA system.

② Power off registration: Performed when the mobile station is powered off.

③ Registration based on timer: Run after a certain time.

④ Location-based registration: Executed if you leave a certain position from the last registration point.

⑤ Local standard registration: Performed when the mobile station enters a new area.

⑥ Parameter change registration: It is executed when the parameter of mobile station is changed.

⑦ Order registration: It is performed when the base station requests registration.

⑧ Indirect registration: Performed whenever the mobile station uses the access channel.

The present invention limits the mobile communication service to the WLL terminal by modifying the location reference registration method among the eight registration methods described above.

That is, in the initial synchronization between the base station and the WLL terminal, the base station receiving the subscriber information and the location information according to the registration process from the WLL terminal before the allocation of the communication channel is performed. The stored subscriber information and the location information are compared with each other to connect the call when there is no problem in the current position of the WLL terminal, and the call is not connected when the position of the WLL terminal changes by more than a predetermined value.

In order to perform the call processing procedure, the subscriber who purchased the WLL terminal first presents the personal information and the location of the WLL terminal to the service provider according to the initial registration procedure, and the service provider provides the information presented by the subscriber. It enters and manages the neighboring base station located in the nearest position within the cell radius.

Now, when the WLL terminal and the base station perform the call processing method of the WLL terminal according to the present invention will be described in detail the operation flow according to it.

5 is a flowchart illustrating a call processing process of the WLL terminal according to the present invention, and FIG. 6 is a flowchart illustrating a call processing process of the base station according to the present invention.

Referring to FIG. 5, the WLL terminal transitions to a system decision substate S501 in a power on state or another state S500 according to a call processing process, and operates in an analog mode in a system decision substate S501. By performing the initial task (S502) to start the call processing process.

After completing the analog mode operation according to the initial task (S502), the WLL terminal transitions to a pilot channel acquisition substate (S503) for acquiring a pilot channel from a base station according to a call processing process, and acquires a synchronization channel after acquiring the pilot channel. Transition to the synchronization channel acquisition substate S504 is performed.

In this synchronization channel acquisition substate (S504), the WLL terminal first transmits its own information, that is, subscriber information and location information MIN1, MIN2, ESN, etc., to the registered neighbor base station prior to the transmission of the synchronization signal.

Then, the transition to the time change substate S506 is made.

Referring to FIG. 6, when the WLL terminal initiates a call processing process as described in FIG. 5, the base station performs a call processing process of sequentially processing a pilot channel, a synchronization channel, a call channel, an access channel, and a call channel. (S601-S606).

At this time, the base station compares the subscriber information and the location information transmitted from the WLL terminal with the information already stored in the synchronization channel processing process (S602), respectively, and determines call connection or termination with the WLL terminal.

That is, the base station receiving the subscriber information from the WLL terminal compares the received subscriber information with the registered subscriber information before setting up the call channel, and connects the call if the location of the current WLL terminal has not changed. If the location of the terminal is changed, a message is sent to the WLL terminal notifying that the call is not connected.

The position error of the WLL terminal is determined according to the ratio of the abnormality between the position calculated after calculating the position between the base station and the WLL terminal and the position already registered within a predetermined tolerance.

To this end, the WLL terminal transmits its latitude and longitude information to the base station through its system parameter message, and the base station uses the latitude and longitude information transmitted from the WLL terminal and its latitude and longitude information to determine the position between the WLL terminals. Calculate. At this time, the base station transmits its location, latitude, and longitude information to the WLL terminal so that the WLL terminal can update its current location information.

On the other hand, when the WLL terminal moves out of the base station registered in the initial service request to the new area, the subscriber information is newly registered in the base station serving the new area and the subscriber information registered in the previous base station is deleted. To this end, the service provider updates the new subscriber information and location information by modifying the NAM program of the WLL terminal when the base station is converted according to the movement of the WLL terminal.

As described above, the present invention does not support the mobility of the WLL terminal by reducing the mobility of the WLL terminal in the wireless subscriber network to which the call processing protocol of the CDMA system is applied, thereby reducing the service operation cost of the service provider. In addition, the amount of money can be predicted and adjusted.

Claims (4)

Transmitting, by the terminal, its location information to the base station upon initial synchronization with the base station; Comparing, by the base station, whether the location information transmitted from the terminal is identical to the location information for the terminal that is already registered; And disabling the call connection to the terminal when the transmitted position information and the registered position information are different from each other. delete The method of claim 1, wherein in the comparing step, Obtaining, by the base station, a difference value between the transmitted location information and the location information already registered; And determining that the transmitted location information and the already registered location information are different from each other when the difference value exceeds a preset reference range. The method of claim 2, wherein after the automatic release of the call, And transmitting, by the base station, a message regarding automatic release of the call to the terminal.