KR100400728B1 - Method for call connection of mobile terminal - Google Patents

Abstract

The present invention provides a method for accessing a call of a terminal so that the terminal can transmit and receive even when there is no resource available in the base station with the strongest pilot strength. As a result of checking whether there is available resource of a specific base station, no resource exists. In a terminal call access method in a case, a first step of informing a terminal that a resource does not exist, a neighbor in which a resource exists using resource information of neighboring base stations of a zone in which the specific base station is included. A second step of searching for a base station, a third step of notifying a terminal of information about any neighboring base station where resources exist through the specific base station, and the terminal synchronizing with the arbitrary neighboring base station and determining it as an access base station. A fourth step is achieved.

Description

Call connection method of terminal {METHOD FOR CALL CONNECTION OF MOBILE TERMINAL}

The present invention relates to a method for accessing a call of a terminal that can receive an outgoing or incoming service even when a resource having a strong pilot strength in the IMT-2000 system does not have a resource.

In general, IMT-2000 system integrates various systems such as mobile phone, CT-2, CT-3, PHS, PCS, satellite communication, pager, fixed network, and integrated mobile service through limited wireless access. Aim to provide.

In addition, to provide a variety of mobile multimedia services similar to or better than a fixed network and up to 2Mbps, to support terminal and personal mobility for international roaming, and to quickly introduce high value-added services. Use an intelligent network.

The IMT-2000 system is being developed to provide voice, non-voice, and wireless calling services such as audio, fax, and video to anyone, anytime, anywhere, anytime, anywhere. .

It accommodates the diversity of terminals, from pedestrian cellular phones to vehicle telephones, as well as the diversity of networks such as satellite mobile communications, public switched telephone networks (PSTN), and ISDN.

The configuration of such an IMT-2000 system is shown in FIG.

1 is a block diagram of an IMT-2000 system according to the prior art.

As shown in FIG. 1, a plurality of mobile stations (MSs) 11 and a plurality of base stations (BSs) for connecting an outgoing or incoming call by wirelessly connecting the terminals 11. (13), Radio Network Controllers (RNC) for controlling the base stations 13, and a mobile switching center (MSC) for managing outgoing or incoming calls with the terminals (11). 17 and a Home Location Register (HLR) 19 for registering and managing location information of the terminals 11.

In the conventional IMT-2000 system, the terminal 11 receives a pilot channel from several base stations (BS) 13.

Then, the channel having the best reception field strength among several pilot channels is selected and the access base station to be used in transmission or reception is designated by using the channel.

That is, the CMService Request (CMService Request) at the termination procedure or origination procedure for transmitting a paging response by the paging message received from the switching center 17 Etc. can only be accessed through a previously designated base station.

However, if there is no resource available to the designated access base station, the call connection service of the terminal is impossible.

That is, the access base station receives the pilot strength from each base station and determines the base station transmitting the strongest pilot strength among them as the access base station. This becomes impossible.

However, reducing the transmission power of the base station also causes a system load because all terminals accessing the base station simultaneously register location with other base stations.

The operation of the IMT-2000 system terminal will be described in more detail as follows.

A terminal of the IMT-2000 system receives several pilot channels from neighboring base stations.

That is, only the pilot strength received from several base stations is used as a basis for determining the base station resource to be used by the terminal.

Subsequently, after selecting a pilot channel having the strongest pilot strength, the terminal performs location registration using location information received through a broadcasting channel, a SYNC channel, and the like, and maintains an idle state.

In other words, when attempting to transmit or receive, the terminal uses only the base station registered by the terminal.

In this situation, when the base station is in an abnormal state, that is, when the base station does not operate, the terminal may move to another base station and use resources of another base station, but the base station is normally operated and there is no available resource. The connection becomes impossible.

Therefore, even in a high-traffic building area, even though resources of neighboring base stations are abundant depending on the time of day, call access is not possible from the depleted base stations, since the terminal's service base criterion uses only pilot strength. .

In such a conventional IMT-2000 system, the call connection method of the terminal has the following problems.

That is, the terminal determines the base station to be used for location registration using only pilot strength and continuously maintains the access base station only with pilot strength.

Therefore, even if there are several base stations with resources around, if the pilot strength of the specific base station is very strong, or if it is located at the line-of- sight due to the nature of the terrain, the resource may continue regardless of the resource of the specific base station. Attempting to receive the service eventually results in the terminal not being able to connect to the call.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems of the prior art, and provides a method of accessing a terminal without a base station resource capable of originating and receiving a terminal even when no resource is available in a base station with the strongest pilot strength. There is this.

1 is a block diagram of an IMT-2000 system according to the prior art

2 is a block diagram of an IMT-2000 system according to the present invention;

3 is a flowchart illustrating a call connection method of a terminal according to the present invention.

4 is a processing flow of a terminal that receives movement information of an access base station when there is no available resource of the base station

5 is a processing flow when resource usage redundancy of the base station occurs during all channel calls

Explanation of symbols for the main parts of the drawings

11,21: terminal 13,23: base station

15,25: radio network controller 17,27: switching center

19,29: Home Location Register 31: Workstation for all channel call processing

In order to achieve the above object, the method for accessing a terminal without a base station resource of the present invention is a method for accessing a terminal when there is no resource as a result of checking whether a specific base station is available. A first step of notifying that the resource does not exist, a second step of searching for a neighboring base station where the resource exists using resource information of the neighboring base station of the zone in which the specific base station is included, and any resource present And a third step of notifying the terminal of the information about the neighbor base station to the terminal through the specific base station, and the terminal comprises a fourth step of synchronizing with the arbitrary neighbor base station and determining the access base station.

Hereinafter, a call connection method of a terminal without a base station resource of the present invention will be described with reference to the accompanying drawings.

2 is a block diagram of an IMT-2000 system for implementing a call connection method of a terminal without a base station resource according to the present invention.

As shown in FIG. 2, the IMT-2000 system according to the present invention separately configures a work station 31 for all-channel busy processing that receives information about a specific base station and neighboring base stations.

The work station 31 for all-channel call processing is configured to be connected to all the wireless network controllers 25 through TCP / IP, so that the connection is easy even when the wireless network controller 25 is expanded. .

The information accommodated in the workstation 31 not only includes base station information surrounding one specific base station, but also zone-based location information for integrating and operating several base stations into a region. Also includes.

These two kinds of information are information used as a criterion when the terminal needs to change a service base station, and when there is a change of a base station included in a zone, which is a standard for expanding or closing a base station and registering a location. It must be updated.

On the other hand, the terminal needs a function to change the access base station to be used also by the information (Broadcast) to the access algorithm to determine the base station to access using only the pilot strength (Pilot Strength).

Such a call connection method of a terminal without a base station resource of the present invention will be described in detail with reference to the accompanying drawings.

3 is a flowchart illustrating a call connection method of a terminal without a base station resource of the present invention.

As shown in Fig. 3, the base station determines whether there is an available resource (S301).

If there are available resources, the terminal continues to use a specific base station, and if there are no available resources (All Channel Busy), the specific base station notifies the radio network controller that there are no available resources (S302).

Here, the fact that there are no resources available includes both situations in which all resources are in use and a case in which handoff resources remain but no new accessible resources are available.

The radio network controller informs the resource usage information of all the base stations (peripheral base stations) of the zone including the specific base station to the workstation for the processing of all channels (S303).

At this time, the resource usage information of all base stations in the zone among the information included is used to determine the base station with a lot of extra resources together with the terrain map in determining the other base station.

In addition, the reason for designating a zone is to prevent an increase in the load of the system because many terminals renew location registration at the same time when the zone is changed.

Thus, the workstation stores that the specific base station is All Channel Busy, and searches for a base station that can be serviced using resource usage information and a map of the neighboring base stations (S304).

Thereafter, it is determined whether there is a base station capable of using resources among neighboring base stations (S305). If there is a base station capable of using resources, the base station ID determined by the work station is transmitted to the radio network controller (S306).

If there is no base station available for resource use, changing the zone is inevitable again, and since the location registration of many terminals has to be performed, the flow is terminated because the system load increases rapidly.

Meanwhile, the wireless network controller receiving the ID of the newly designated base station from the workstation transmits base station movement information including information necessary for accessing the new base station, that is, pilot information, frame offset, etc. (S307). ).

The specific base station transmits the base station movement information to the terminal through a broadcast channel (S308).

After receiving the base station movement information, the terminal synchronizes with the newly designated base station and thereafter determines the newly designated base station as an access base station (S309).

In the call access method of the base station without the resource of the present invention, the call connection, which was not possible when there is no available resource of the base station with the strongest pilot strength measured by the terminal, becomes possible, and no system load is generated due to location registration. .

Here, a process of the terminal receiving the mobile information of the base station to be newly accessed will be described with reference to FIG. 4.

4 is a flowchart for describing a processing procedure of a terminal that receives access base station mobility information when there is no available resource of the base station.

As shown in Fig. 4, after receiving base station movement information (S401), the new base station is synchronized with the newly designated base station from then on (S402).

The terminal excludes the base station before the designation (the base station without the resource) from the pilot strength measurement target for the access base station search (Search) for a specified time (S403).

That is, the pilot strength measurement data for the specific base station is ignored for a specified time to prevent the base station without the available resource from being designated as an access base station again by the pilot strength measurement of the terminal.

Subsequently, it is checked whether the base station designation time is completed (S404). If the designated time is completed, the situation is inquired by the radio network controller through the designated base station (S405). It is checked whether a message indicating that there is an available resource exists from the base station, which has not been available due to the channel call (S406).

If the message has not been received, the specific base station determines that there are still no resources available and continues to check whether the base station designated time is completed (S404).

Here, if a message indicating that there is a resource available for the specific base station is received, the flow proceeds to FIG.

5 is a flowchart when a message is received that there is a resource available to a specific base station that was in a full channel call.

As shown in FIG. 5, the specific base station, which initially had no resources available, now reports a message indicating that resource redundancy has occurred to the radio network controller (S501).

The wireless network controller reports this to the workstation for processing during the full channel call (S502).

The work station releases all channel busy conditions of a specific base station, and sends a newly designated base station ID to the radio network controller instead of the specific base station (S503).

The wireless network controller sends information indicating that the specific base station is in a normal state (that is, a state in which available resources exist) to the newly designated base station (S504).

The newly designated base station that has received the information notifies the terminal of this (S505).

Upon receiving this, the terminals stop the process inside the terminal so that the terminals can measure the pilot strength for all base stations and determine the access base station according to the result (S506).

On the other hand, using the call access method of the terminal without the base station resources of the present invention can be applied so that all the terminals can receive the service even in the high traffic region and time zone.

As described above, the call connection method of the terminal without the base station resource of the present invention has the following effects.

If there is no resource in the base station with the strongest pilot strength measured by the terminal, the terminal can be connected by searching for the base station with the resource using the neighboring base station information and designating it as an access base station.

In addition, no load of the system occurs due to location registration or the like.

Claims (3)

In the method of accessing a terminal call when there is no resource as a result of checking the availability of a specific base station, A first step of informing the wireless network controller that the specific base station does not have available resources of the specific base station to the terminal; The wireless network controller sends resource information of a neighbor base station of a zone including the specific base station to a workstation, and the workstation uses resource information of a neighbor base station of a zone including the specific base station. A second step of searching for a neighbor base station where the resource exists, A third station in which the workstation informs the radio network controller of information on any neighbor base station where the resource exists, and the radio network controller informs the terminal of the information about the arbitrary neighbor base station to the terminal through the specific base station. step, And the fourth step of synchronizing with the arbitrary neighbor base station and determining the random neighbor base station as an access base station. The method of claim 1, wherein the fourth step Preventing the terminal from reselecting the specific base station as an access base station of the terminal by ignoring the pilot strength data for the specific base station during a time period in which the base station can be designated as an access base station; The terminal checks whether the designated time has been completed, and whether the terminal receives a message indicating that the terminal is present through the wireless network controller or notifying the terminal that a resource available from the specific base station is present. The method of claim 1, further comprising the step of checking the terminal. The method of claim 2, wherein when the terminal receives a message indicating that there is a resource available from the specific base station, The terminal releasing an all-channel busy situation for the specific base station and notifying the designated access base station that the specific base station is in a normal state; Notifying the terminal that the specific base station is in a normal state, stopping the process of ignoring the pilot strength of the specific base station and checking whether the message is received, checking the pilot strength of all the base stations, and determining an access base station according to the result; Call connection method of the terminal, characterized in that further comprises.