KR19980043203A - Multi Paging Method to Incoming Mobile Station - Google Patents

Abstract

[purpose]

According to the present invention, in a digital mobile communication system using a CDMA method, a paging step is divided according to a paging area when paging is performed to find a destination mobile station, and the wasteful radio resources are minimized by sequentially processing the divided paging steps. The present invention relates to a method of multi paging to a destination mobile station to increase paging efficiency of a system.

[Configuration]

According to the present invention, after performing a first step of paging a base station of an area in which the mobile station is currently located, if the paging of the first step fails, the base station is extended from the base station determined to be located to the neighboring base station area to page the base stations. If the paging of the second stage fails again, the paging area is further extended to the group base station region in the exchange to sequentially page the terminating mobile station by performing the third stage of paging the base stations. do.

Description

Multi Paging Method to Incoming Mobile Station

1 is a block diagram of a mobile communication switching system for performing the multi-paging process of the present invention.

Figure 2 is a signal flow diagram showing a multi-paging process according to the present invention.

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

100 exchanger 200 control station

300: base station 120: paging control unit

According to the present invention, in a digital mobile communication system using a code division multiple access (CDMA) method, a paging step is divided according to a paging area when paging is performed to find a destination mobile station, and the divided paging steps are sequentially processed to provide radio resources. The present invention relates to a method of multi paging to a destination mobile station to minimize waste and increase paging efficiency of the entire system.

In general, a CDMA mobile communication system is a communication system between mobile stations that can communicate with anybody, anytime, anywhere, using radio waves in a space, or between a mobile station and a fixed station. A base station for managing radio resources, a control station for controlling the base station and transmitting and receiving messages to and from the base station, and a switch for performing a switching role in conjunction with the control station, another station, and another network.

In such a mobile communication system, when the calling mobile station requests an incoming call to the called mobile station to make a call with the called mobile station, first, the calling mobile station is found through a paging procedure, and then the call is connected to make a call between the calling and receiving mobile stations. Doing.

In the paging procedure for the destination mobile station as described above, in the past, paging is performed at a time on all base stations within the exchange from the base station in the area determined to be located to the neighboring base station which does not exist to the base station. I found the incoming mobile station.

However, since the conventional paging method performs paging for all base stations in the exchange regardless of the existence of the destination mobile station, it processes even unnecessary paging for the base station where the destination mobile station does not exist. In particular, when the destination mobile station is located at a location affected by the neighboring base station, the failure rate of the paging is very high and the paging performance of the entire system is degraded.

Accordingly, the present invention has been made to solve the above problems, and its object is to sequentially perform the multi-paging of the first, second, and third steps according to the expansion of the paging area when paging to the destination mobile station. The present invention provides a multi-paging method for a destination mobile station to minimize radio resource waste and paging failure rate and improve paging performance of a system.

According to the multi-paging method of the present invention for achieving the above object, after performing the first step of paging the base station of the area where the mobile station is currently determined to be located, it is determined that the mobile station is located if the paging of the first step fails. Performing a second step of paging the base stations by extending from the base station to an adjacent base station area; and if the paging of the second step fails again, a third step of further extending the paging area to the group base station area in the exchange to page the base stations. Paging the destination mobile station by performing the steps sequentially.

Hereinafter, a multi-paging method to a destination mobile station of the present invention will be described in detail with reference to the accompanying drawings.

1 is a block diagram of a mobile communication switching system for performing a multi-paging process of the present invention, wherein a plurality of processing switching subsystems (Access Switching Subsystems), which are in charge of call processing of a mobile station (not shown); (MO-0ASS-Mn 'abbreviated) (100-0 ~ 100-n) and a switch including a paging control unit 120 for controlling the paging process (Mobile Services Switching Center; hereinafter referred to as' MSC') BSCO-BSCn (200-0-200-n) which are a plurality of control stations 200 connected to each of (100) and the ASS-MO-ASS-Mn (100-0-100-n) of this exchange 100, respectively. ) And BTSOO to BTSnm (300-00 to 300-nm), which are a plurality of base stations 300 connected under the BSCO to BSCn (200-0 to 200-n) in the control station 200, Data transmission to the mobile station is made.

The paging control unit 120 located in the switch 100 is a block for performing the paging process according to the present invention. The paging control unit 120 may include a database having each base station information, LAI (Location Area Identity) information, and LAI group information currently mounted. Obtain information needed for paging.

Meanwhile, according to the present invention, the basic unit of the paging area in the paging procedure is a base station, and it depends on how the base stations are grouped as all paging areas are based on the area of the base station.

Accordingly, although there are many operational considerations in the mobile communication network of the present invention, a certain base station section in which the location movement of the mobile station frequently occurs is bundled into one group, LAI, which is the basis of the paging area.

At this time, a base station belonging to one LAI may not belong to another LAI.

And, as the base stations are grouped into one group and expressed as LAI, these LAIs are grouped into one group to represent the location area of a larger area, which is called an LAI group.

The LAI and the LAI group are not fixed areas, but may vary variably according to a situation.

Base station ≤ LAI ≤ LAI group ≤ exchange area

Next, the multi-paging procedure to the destination mobile station using the paging control unit 120 in the mobile communication switching system configured as described above will be described with reference to the signal flow diagram of FIG.

When the calling mobile station attempts to make a call, the paging control unit 120 of the exchange 100 receives the location information of the destination mobile station consisting of the LAI, the control station and the base station defense, and receives the location information of the received destination mobile station and its own. Based on the base station mounting information, the transmission path of the paging signal is found to perform primary paging for the corresponding base station.

That is, since the PASS control unit 120 needs to go through the ASS-M subsystem in the exchange in order to be connected to the control station, the Paging control unit 120 determines which ASS-M subsystem to which the paging to be performed is currently connected through the location information of the destination mobile station. Figure out and make paging requests to this subsystem.

The call processing matching block of the ASS-M subsystem that has received the paging request then forwards this paging signal to its associated control station to perform the primary paging procedure.

Upon receiving the paging signal, the control station checks the information of the base station, and requests paging to the base station and waits for a response from the destination mobile station.

If there is no response from the destination mobile station for the primary paging, the secondary paging process is continued.

In the second paging, paging is performed based on the location information of the destination mobile station. The difference from the primary paging is that the paging information is configured to be paged to a larger area, that is, the LAI area, than to the base station area. .

The reference area for the second paging is the LAI number, which is information already known at the time of the first paging, and thus finds all base stations belonging to the corresponding LAI and configures paging information.

At this time, when the paging request to the base station as described above, the paging signal path must be known, even if the base station belonging to the same LAI path, that is, the ASS-M subsystem and the control station may be different from each other, the paging control unit ( 120 performs selection of base stations with the same path using base station information to send each paging signal to each ASS-M subsystem.

When the base station sorting operation having the same path is completed, a secondary paging signal is sent to each corresponding ASS-M subsystem.

The ASS-M subsystem receiving the secondary paging signal transmits a paging signal to the control station connected to the mobile station, and finally requests secondary paging from the control station to the corresponding base station, and responds to the secondary paging from the destination mobile station. waiting.

If there is also no response from the destination mobile station, the paging area is extended to all base stations in the LAI group as well as the base station in the LAI to perform third-order paging.

In this case, since the LAI and LAI group region may always vary depending on the situation, the LAI group may be a switch region.

Secondary paging was performed to find all the base stations belonging to the LAI. In this third paging, the same method was used, but the LAI group used for the primary and secondary paging was used to find the LAI group to which the LAI belongs. Paging all LAIs in this group.

Similar to the secondary paging, the tertiary paging finds all the LAIs in the LAI group based on paging for the LAI, and then selects the base stations having the same path among the corresponding base stations for each LAI, and the corresponding ASS-M subsystem, The third station paging signal is sent to the control station and the base station in order to request the third paging.

Then, if there is no response to the tertiary paging from the terminating mobile station, the paging procedure for the next LAI is continued, and if there is a response, the call is connected to the terminating mobile station to make a call between the originating and terminating mobile stations.

When the paging procedure for one LAI is completed during the third paging, if there is no response from the destination mobile station, the paging procedure for the next LAI is repeated by repeating the paging procedure for the next LAI to request paging to the destination mobile station. do.

In performing the above-described multi-paging by the 1st, 2nd and 3rd order, it is assumed that the number of currently installed base stations has the maximum capacity that can be accommodated in the exchange, and that the paging area is single paging to the entire exchange. If so, in order to connect one call, the exchange should attempt to page all areas within the exchange and all base stations in the exchange.

This has been described as a conventional problem.

On the other hand, assuming that each paging area is the entire base station LAI LAI group exchange, each paging area is narrower than the entire area of the exchange, and the utilization efficiency of the paging resources can vary greatly depending on when the response from the destination mobile station comes. .

Therefore, according to the present invention, the timing of the paging response is increased according to how the paging area is divided and how accurate the mobile station location information is, so that the use efficiency of the paging resource is increased.

In addition, since the first, second, third, and third paging attempts are made to the area determined as the location of the first mobile station, loss of radio information that may occur during paging can be considered.

As described above, according to the present invention, after performing the first paging for the base station in which the mobile station is located, if there is no response from the destination mobile station, the secondary paging for the base station in the LAI is performed. Paging area can be extended to all base stations for all LAIs to perform third-order paging, thereby minimizing radio resource waste and paging failure rate and improving system paging performance.

Claims (2)

A first step in which the paging control unit 120 of the exchange 100 receives location information of a terminating mobile station consisting of a location area identity (LAI) and a control station and base station defense when the calling mobile station attempts a call; A second step of requesting primary paging to the corresponding base station by transmitting a paging signal in the order of the corresponding ASS-M subsystem, the control station, and the base station by using the location information of the destination mobile station and base station mounting information received in the step; A third step of extending a paging area to a base station belonging to the LAI if there is no response to the primary paging from the terminating mobile station after the first paging request of the second step; and a path among the base stations belonging to the LAI extended in the third step In step 4 of selecting the same base station and in step 4, when the base station is selected, the paging signal is transmitted in the order of the corresponding ASS-M subsystem, the control station, and the base station. A fifth step of requesting secondary paging to the base station, and if there is no response from the destination mobile station to the secondary paging after the second paging request of the fifth step, the paging area is extended to the base stations for all LAIs in the LAI group. According to the sixth step and the paging extension of the sixth step, the base station having the same path among the corresponding base stations is selected for every LAI in the LAI group, and then the third paging signal is transmitted to the corresponding ASS-M subsystem, the control station, and the base station. If there is no response for tertiary paging from the terminating mobile station after requesting tertiary paging to the corresponding base station and the tertiary paging request of the seventh step, the paging procedure for all LAIs is performed until there is a response. Multi-paging to the destination mobile station, characterized in that the eighth step is performed sequentially and, if there is a response, connects the call to the destination mobile station. Way. The method of claim 1, And the paging area is extended to a base station < RTI ID = 0.0 > LAI < / RTI > LAI group < / RTI >