KR20000033328A - Method for controlling switch in performing continuous hand-off between exchanges - Google Patents

Abstract

PURPOSE: A method for controlling switch in performing continuous hand-off between exchanges is provided to achieve the hand-off execution of a high speed with reduced system loads by minimizing the hand-off execution path in the anchor exchange and simplifying the speech path removing procedure in the serving exchange. CONSTITUTION: In the personal communication service exchanges(20-22), a subscriber(b) between two mobile subscribers(a,b) under lines busy in the same mobile radio interface subsystem ASS_W using the time switch proceeds forward hand-off(b') along the (a) line to the domain that other personal communication service exchange(21) manages and processes call with the speech path by intra_junctor in the same radio wireless interface subsystem(ASS_W). Then, the subscriber(b) proceeds inter-exchange continuous hand-off(b'') along the (b) line to the service domain that the third personal communication service exchange(22) manages.

Description

Switch control method during continuous handoff during the exchange period

The present invention relates to a method for controlling a switch during continuous handoff of an exchange period. More particularly, the present invention relates to a switch control method for performing a handoff during a period of continuous handoff after a forward handoff is performed. The present invention relates to a method for controlling a switch during continuous handoff in an exchange period that enables a high speed handoff by reducing system load by minimizing a handoff execution path at an anchor exchange and simplifying a call release procedure at a serving exchange.

In general, the hand-off technology refers to a technology that guarantees continuity of a call by automatically switching a call path when the mobile subscriber moves not only within the same exchange service area during a call but also moves to another exchange service area. .

FIG. 1 is a diagram illustrating a personal network configuration for explaining a generally used exchange period forward handoff and continuous handoff. The subscriber is a database management system for storing and managing subscriber parameters and location information for all registered terminals. A location register (10: Home Location Register, hereinafter referred to as 'HLR'); In order to perform the call processing function, mobility management (location registration, handoff) function of the mobile subscriber and the exchange function according to the call request of the subscriber, the information exchange function with the HLR 10 and the signal and voice data transmission / reception with the terminal are performed. A personal communication switch (20-22: Personal Communication Service eXchange, hereinafter referred to as 'PCX') that performs an interface function with a base station controller for the mobile station; A base station controller (30 to 32: base station controller, hereinafter referred to as 'BSC') that performs a matching function with a base station, an inter-cell handoff process, and a call control function; Base transceiver system (40-43: Base Transceiver System) for transmitting and receiving radio signals and system synchronization, radio channel encoding and decoding, signal strength and quality measurement, baseband signal processing, diversity, radio resource management and self-maintenance functions. , Hereinafter referred to as 'BTS'; It consists of mobile terminals 50 (PS (a), PS (b), PS (b '), PS (b ") as personal portable terminals which are wirelessly matched with the base stations 40-43.

The base station controller (BSC) 30 to 32 is connected to the switch PCX (20 to 22) through the switch internal interface or No. 7 to control a plurality of base stations 40 (BTS).

In the case of the same figure, when the mobile terminal 50-PS (a) and the PS (b) during the call of the PS (b) are moved to the PS (b '), the mobile terminals PS (a) and PS (b'). Forward hand-off is performed between the two exchanges 20 and 21 to connect the call paths. After the forward handoff is performed as described above, the mobile terminal PS (b ') is again connected. When switching to PS (b "), the exchange 20 releases the call path with the exchange 21 which has previously provided service and continuously hand-offs with the exchange 22 which is currently the target for handoff. to third) to connect the two mobile stations PS (a) and PS (b ").

The switches 20 to 22 are called with three different names according to their functions. First, the switch 20 to 22 is an exchange that first allocates a traffic channel at the time of origination and reception of a call and is anchored when moving to a service area of another exchange during call setup. The exchanger, which is a (fixed) point, is called an anchor exchanger, and in the case of FIG. 1, becomes a PCX 20.

In addition, an exchange currently accepting mobile subscribers in its service area and providing a service is referred to as a 'serving exchange'. In FIG. 1, the exchange shown by the PCX 21 is shown.

In addition, the exchange that is the target of the handoff in providing the exchange period handoff that occurs when the subscriber moves the exchange period is referred to as a 'target exchange' and is referred to as a PCX 22 in FIG.

Thus, when the forward handoff and the continuous handoff schemes are represented by the connection relationship of the exchanges, the forward handoffs indicate that the call path is connected by switching the call from the anchor exchange or the serving exchange to the target exchange. In the case of the handoff, after performing the forward handoff in the exchange period, the call is transferred to the target exchange targeted for the handoff in accordance with the movement from the current serving exchange service area to the service area managed by another exchange.

FIG. 2 is a block diagram of a time switch in a switch (PCX) 20 to 22 shown in FIG. 1, which includes a time slot 70 (Time_Slot) for time division processing of call processing information of a mobile subscriber to perform a matching function; Intra-interceptor 90 which provides a data link channel (Link_Channel) responsible for voice path connection with the spatial division switch 100 (S_SW) and a path for handoff processing of mobile subscribers in the same matching subsystem (ASS_W). Intra_Junctor).

The time switch 60 (T-SW) having the above configuration receives data through a pulse code modulation (PCM) method through the data link channel 80 and performs a space division exchange function by a parallel switching method. It is connected to (100: S_SW) to perform a mutual matching role.

The figure shows the handoff switch resources in the anchor side subscriber matching subsystem (hereinafter referred to as 'ASS_W') during forward handoff and continuous handoff during the exchange period, as shown in the figure, during a call between mobile subscribers. When the switch is connected to another ASS_W or when a call is connected to another exchange using a relay line like a relay call, a call path is configured using the space division switch 100 (S_SW), and in the case of the same ASS_W, an intra jitter ( 90).

In addition, an arbitrary virtual time slot (hereinafter referred to as VTS) may be configured in software for handoff processing of a mobile subscriber without allocating an actual time slot in the connection process between the switches. The timeslot may be allocated the VTS to store the handoff channel information and the timeslot information and use the information to perform the continuous handoff period.

However, in order to perform the continuous handoff in which the call path is connected to the anchor exchanger → the serving exchanger → the target exchanger as described above, the anchor exchanger and the serving exchange period are already connected. Disconnects the call path, i.e., releases the call path from the serving exchange, and again connects the call path with the target exchange targeted for handoff.

However, conventionally, upon release of a call from the serving exchange, the subscriber call processing block in the subscriber matching time switch receives a resource release message from the anchor exchange, releases the space splitting switch, and receives a release result. By releasing the notification, the release result is notified. After that, the subscriber matching time switch is released and the release result is notified to the anchor exchange. A much required problem has arisen.

Therefore, the switch control method in the case of continuous handoff during the conventional exchange period has a problem in that it is difficult to perform a high-speed handoff due to an increased system load due to an increased transmit / receive signal.

Accordingly, the present invention has been made to solve the above problems, and an object of the present invention is to reduce the number of transmission and reception signals according to the channel release procedure of the serving exchange, thereby reducing the system load, thereby enabling fast handoff. The present invention provides a method for controlling a switch during continuous hands.

In order to achieve the above object, the present invention performs a forward handoff between the anchor exchange and the serving exchange, and then perform a call connection according to the movement from the serving area of the serving exchange to the service area under the control of another exchange. In the switch control method for continuous handoff during the exchange period,

A first step of storing, in the anchor exchange, data link channel information and intra jitter information in addition to the timeslot information in a virtual timeslot;

A second process of releasing an intra jitter connection with an existing handoff channel connected to the serving exchange, and then connecting the handoff channel of the virtual timeslot information and the intra jitter;

In the serving exchange, the handoff relay line processing unit of the relay line matching time switch receives a switch resource release message from the anchor exchange and releases the relay line matching time switch and the space division switch at the same time. And a third process of completing the switch processing for the off.

1 is a configuration diagram of a personal network for explaining a switching period forward handoff and continuous handoff generally used

FIG. 2 is a configuration diagram of a time switch in the exchange shown in FIG. 1

3 is a block diagram illustrating a switch control method when the switch control method is applied in the same mobile subscriber matching subsystem (ASS_W) during continuous handoff during the switching period according to the present invention.

Figure 4 is a flow chart illustrating a signal transmission and reception procedure of the switch control method during the continuous handoff exchange period in accordance with the present invention

<Description of the code | symbol about the principal part of drawing>

10: subscriber location register 20-22: exchange

30 to 32 base station controller 40 to 43 base station

50: mobile terminal 60: time switch

70: timeslot 80: data link channel

90: intra jitter 100: space division switch

The above and other objects and features and advantages of the present invention will become more apparent from the following detailed description taken in conjunction with the accompanying drawings. Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings.

FIG. 3 is a block diagram illustrating a switch control method when the switch control method is applied in the same mobile subscriber matching subsystem (ASS_W) during continuous handoff during the switching period according to the present invention. Forward handoff (b) as shown by the line of (a) to the area where one subscriber (b) is in control of the other exchange 21 among the two mobile subscribers (a, b) in the same ASS_W. (B) proceeding with a call by an intra-junction within the same subscriber matching subsystem (ASS_W), and then going back to the service area under the control of the third switch 22 (b). The switch configuration diagram in the case of performing the continuous handoff b &quot; during the exchange period as shown by the line shown in FIG.

At this time, during continuous handoff of the switching period, the switch processing is controlled by the time switch of the anchor exchange, which is a link that is responsible for the voice path between the time slot 70 that meets the subscriber and the spatial switch as shown in FIG. The resources of the time switch 60, which is composed of the channel 80 and the intra-junction 90 used as a connection ring during handoff, are all used, and a new call is made while temporarily maintaining the established call path. After setting up the furnace, it proceeds in order to cut the old currency.

4 is a flow chart illustrating a signal control procedure of a switch control method during a continuous handoff during an exchange period according to the present invention. Hereinafter, the process of the present invention will be described in detail with reference to the drawings.

Initially, the initial state of operation is exchanged between two mobile subscribers a and b in a busy state in the same mobile subscriber registration subsystem ASS-W, as shown by the dotted line in FIG. A period forward handoff is successful and starts with a call b 'at different exchanges.

When the serving exchange receives the handoff request message from the base station controller (BSC) in its jurisdiction (step 110), it analyzes the serving cell ID to indicate that a continuous handoff is required for the exchange period to the third jurisdiction. A determination is made and a handoff message for the duration of the exchange is sent to the anchor exchange (step 120).

Then, the anchor exchange receives the continuous handoff message from the serving exchange, and then transmits the exchange period handoff request message to the target exchange to which the mobile subscriber intends to handoff (step 130). After receiving the successive handoff request confirmation message from the target exchange in response to the response, a new relay line is allocated and a space switch and a link are connected to configure the call path to the target exchange (step 140).

Thereafter, the target exchange assigns a trunk line time slot to the handoff target base station controller (BSC) in the jurisdiction of service area and transmits a handoff request message to the target base station controller (BSC) (step 150).

Then, when the target exchange receives a response to radio resource allocation from the target base station controller (BSC), the target exchange also allocates a relay line for the communication path with the anchor exchange, wherein the target exchange is the relay line of the target exchange. The time switch, the space switch, and the time switch of the ASS-W, the subscriber matching subsystem, are connected to each other (step 160).

Then, when a response to the handoff request from the target exchange is received at the anchor exchange, the anchor exchange also allocates a spatial switch for the new channel and assigns a link of the relay line and subscriber matching subsystem, ASS-W, respectively. The connection is completed (procedure 170).

At this time, the anchor exchange stores the newly allocated handoff link channel in a new virtual timeslot (VTS2) (step 180), and then sends a response message to the serving exchange for the continuous handoff request. Accordingly, when the reception of the continuous handoff message and the handoff command and the handoff completion message at the target exchange are received, the target exchange sends an exchange period handoff completion message to the anchor exchange and the anchor exchange handoffs the exchange period. Upon receiving the completion message, the new handoff link channel information stored in the virtual timeslot VTS2 is retrieved (step 190), and the existing handoff link channel is disconnected from the intra jitter and the new handoff link is received. Channels and intra-junctions are connected to form a new channel with the completion of the exchange handoff period (step 200).

Thereafter, the channel release procedure of the anchor exchange and the serving exchange for performing the continuous handoff in the exchange period is performed as follows.

First, when the resource exchange request message (FacRel) is transmitted from the anchor exchange to the serving exchange (step 210), the serving exchange receives the resource release request message (FacRel) from the anchor exchange to simultaneously receive the relay line matching time switch and the space split switch. After releasing (step 220), the subscriber registration time switch is released, and then a resource release result message (facrel) is transmitted to the anchor exchange (step 230), thereby completing the switch processing for continuous handoff in the exchange period. Done.

As described above, by releasing the communication path of the serving exchanger in a simple procedure compared to the conventional method, the number of signal transmission and reception can be reduced.

As a result, the system load can be greatly reduced, thereby enabling high speed handoff.

As described above, according to the switch control method during the continuous handoff in the exchange period according to the present invention, the mobile subscriber connected to the anchor exchange moves to the position and performs the forward handoff after serving the continuous handoff during the exchange period. By simply performing the release procedure with a call at the exchange, not only can reduce the number of transmitted and received signals, but also reduce the system load, which has the effect of enabling fast handoff.

In addition, after minimizing the time slot information and link channel information and intra jitter information in the software-configured virtual time slot, the anchor exchange can be used to control the release and connection of the switch, thereby realizing the path minimization handoff. There is an excellent effect that can increase the efficiency of the resources by the exchange system.

In addition, preferred embodiments of the present invention are disclosed for the purpose of illustration, those skilled in the art will be able to make various modifications, changes, additions, etc. within the spirit and scope of the present invention, such modifications and modifications belong to the scope of the claims You will have to look.

Claims (1)

Switch control method during continuous handoff in the exchange period in which a forward handoff is performed between the anchor exchange and the serving exchange, and then a connection is made with a call according to the movement from the service area of the serving exchange to the service area under the control of another exchange. To A first step of storing, in the anchor exchange, data link channel information and intra jitter information in addition to the timeslot information in a virtual timeslot; A second step of releasing an intra-junction connection with an existing handoff channel connected to the serving exchange, and then connecting the handoff channel of the virtual timeslot information and the intra-jitter; In the serving exchange, the handoff relay line processing unit of the relay line matching time switch receives a switch resource release message from the anchor exchange and releases the relay line matching time switch and the space splitting switch at the same time. And a third process of completing the switch processing for the off.