KR19990080219A - Base station control period handoff method when busy within another access switching subsystem of a mobile switching center - Google Patents

Abstract

The present invention relates to a base station control period handoff method when a subscriber is in a different ASS of a mobile communication exchange for controlling the operation of a switch used in an ASS according to the base station control period handoff when two subscribers are busy through each ASS. It is about. According to the present invention, each operation of the space switch 24 in the mobile communication switch 4 and each of the first and second time switches 22 and 26 used in each ASS is performed by each arbitrary mobile subscriber and any fixed subscriber. When the call is in a call through each ASS, according to the handoff between the first and second base station controllers 6 and 10, the control is stably performed through a simple and quick procedure. Therefore, when each subscriber calls through each ASS, the base station control period handoff is accurately effected.

Description

Base station control period handoff method when busy within another access switching subsystem of mobile switching center

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for handoff of a base station control period when in a call in another Access Switching Subsystem (ASS) of a mobile communication exchange (hereinafter referred to as ASS), in particular a switch used in ASS. The present invention relates to a base station control period handoff method when the two subscribers are busy within another ASS of a mobile communication exchange for controlling according to the base station control period handoff when two subscribers are busy on each ASS.

In this regard, the type of handoff will be described as follows.

Handoff, which ensures maximum mobility of mobile subscribers in analog or digital mobile phones, is a key technology in mobile communications. The handoff function is to perform normal mobile call processing from the base station that manages the cell where the mobile subscriber is located to the base station that manages the newly allocated call channel when the mobile subscriber moves from the originating cell to the neighbor cell. In the current exchange, the exchange is divided into base station control periods and switching periods, thereby processing handoffs.

The types of handoffs described in specifications such as the North American protocol methods IS-95, IS-634, and IS-41C are used in current PCS systems, which are classified as softer handoff, soft handoff, and hard handoff. Can be.

First of all, in the case of softer handoff, a sectorized (generally three sector cell structure) is a function of changing a call right in a sector of a subscriber moving from one sector to another in a cell of a base station. This function maintains the call of subscribers moving between cells in the network, and sets up a new channel through a physical link established between two base stations before operating the existing channel and operates two or more channels during the handoff period. It is possible to transfer the call smoothly so that users who receive the service cannot know when to change the call right.

In contrast, in an inevitable situation due to movement during a call, a frequency-to-frequency hard handoff is provided when a new base station cannot allocate a frequency channel, such as a frequency already in use. As the frequency changes, the mobile station's setup process for acquiring a new frequency channel is a short moment, but restarts, so the call tone is not smoothly connected at the moment of call transfer and the subscriber hears a short interruption tone.

In the case of handoffs supported by the exchange, hard handoffs are mainly used.In the case of handoffs below the base station controller (including soft handoffs in case of base international language period handoffs), information management aspects of the base station controllers such as statistics and billing Only manages data. In addition, if such information comes up, if the exchange period handoff has occurred, it also supports the function of delivering to the anchor exchange (anchor exchange: a switch that controls the base station controller of the cell in which the initial call is set up) through the exchange period PAP message. (Eg, internal handoff notification).

In case of base station handoff, soft handoff occurs first in domestic PCS networks, and then a hard handoff request is sent to the exchange. Therefore, in the case of an exchange period handoff that moves in the same frequency channel as the base station control period, soft handoff and hard handoff are simultaneously supported when a link is activated between two base stations where a handoff occurs. This provides an environment in which mobile subscribers can continue to receive services with better call sensitivity.

The present invention is directed to controlling the operation of the space switch (space_switch) and the time_switch used in the ASS according to the base station control period handoff when any mobile subscriber and any fixed subscriber are in a call through each ASS. It is an object of the present invention to provide a base station control period handoff method when a call is in another ASS of a communication exchange.

In order to achieve the above object, the present invention includes a plurality of time slots and a plurality of link channels in each ASS connected to a plurality of base station controllers, respectively, wherein the link channel is connected to an intra_junctor. A mobile communication switching system in which a time switch is connected to a time switch of another ASS through a space switch providing multiple paths: when the base station control period handoff occurs when any two subscribers are busy through each ASS. And a first step of connecting a specific path of the space switch and setting the handoff channel of the time switch before the handoff is generated (hereinafter, referred to as a serving side) by using a link channel. A second step of connecting with a path, the mobile call according to the handoff, and the specific path with the handoff A third step of connecting via a mobile subscriber side (hereinafter referred to as a target side) time switch moving to an area of a base station controller; and a fourth step of confirming that the call before the handoff is not a call by the intra jitter. And a fifth step of establishing a new handoff call path between the two subscriber calls by connecting the handoff channel and the other subscriber call through an intra jitter on a serving side.

1 is a block diagram illustrating an embodiment of a mobile communication system for explaining a base station control period handoff method when in a call in another access switching subsystem of a mobile communication switch in accordance with the present invention;

2 is a block diagram illustrating an embodiment of a switch used in an access switching subsystem installed inside a mobile communication switch according to FIG. 1;

3 is a flow chart illustrating, step by step, an embodiment of a base station control period handoff method when in a call within another access switching subsystem of a mobile communication exchange according to FIG.

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

2: home location register 4: mobile communication exchange

6,10: first and second base station controller 8,12: first and second base station

22,26: first and second time switch 24: space switch

Hereinafter, an embodiment of the present invention for achieving the above object in detail.

1 is a block diagram illustrating an embodiment of a mobile communication system for explaining a base station control period handoff method when each mobile subscriber and a fixed subscriber are in a call through their respective ASSs according to the present invention. The Home Location Register (HLR) 2 is a database management system that stores and manages parameters and location information of registered mobile subscribers.

That is, the mobile communication switch 4 is a visitor location register which is a database that stores information of the home location register 2 and all information about mobile subscribers that are installed inside of it and exist in the area managed by the mobile communication switch 4. With reference to the information of the Register (VLR), a switching function including handoff of each mobile subscriber call or a fixed subscriber call is performed in a plurality of base station control periods such as the first and second base station controllers 6 and 10.

In addition, a plurality of base station controllers, such as the first and second base station controllers 6 and 10, respectively control a plurality of base stations. For example, the first base station controller 6 may include a plurality of base stations such as the first base station 8 and the like. The second base station controller 10 controls a plurality of base stations, such as the second base station 12.

At this time, a plurality of base stations such as the first and second base stations 8 and 12 transmit and receive with the mobile terminal corresponding to their cell and register the mobile terminal with the visitor location register of the mobile communication exchange through their base station controller.

FIG. 2 is a block diagram illustrating an exemplary embodiment of a switch used for each of a plurality of ASSs installed in the mobile communication switch 4 according to FIG. 1, and includes a plurality of time switches such as first and second time switches 22 and 26. Can be connected via a space switch 24 providing multiple paths.

In this case, the space switch 24 is set in an INS (Interconnection Network Subsystem) separate from the above-described ASS, and the first and second time switches 22 and 26 are each composed of a plurality of time slots and a plurality of link channels. The link channel is connected to the intra jitter through a speech memory formed therein. The link channel of the first and second time switches 22 and 26 and the space switch 24 are connected to each other. The time slots of the time switches 22 and 26 are connected with mobile subscriber calls or fixed subscriber calls.

FIG. 3 is a flowchart illustrating step by step an embodiment of a base station control period handoff method when a mobile subscriber and a fixed subscriber are in a call through each ASS in the mobile communication switch 4 according to FIG. 1.

First, a particular ASS in the mobile communication exchange 4, any mobile subscriber through the first base station controller 6, and the first base station 8 and any fixed subscriber through another ASS in the mobile communication exchange 4 When the mobile subscriber call under the control of the first base station 8 is moved to the second base station 12 side during a call, when a handoff occurs between the first and second base station controllers 6 and 10, the first and second base station A specific path of the space switch 24 is connected 32 for handoff between the controllers 6 and 10.

Next, the handoff channel of the serving-side second time switch 26 is set using a link channel formed in the second time switch 26 to connect with the specific path of the space switch 24 described above, and the preset virtual time First and second virtual time slot information are respectively stored in the slot memory (not shown) (34).

In this case, the above-described first virtual time slot information may correspond to channel and time slot information of a counterpart subscriber (for example, a fixed subscriber), and the second virtual time slot information may correspond to channel and time slot information of a mobile subscriber that is performing handoff. it means.

Then, the speech channel of the target side first time switch 22 is set using a link channel formed in the first time switch 22 to connect with a specific path of the space switch 24, and the target side first time switch 22 is connected. A new time slot is established to be connected to the mobile subscriber call and connected to the speech channel (36, 38).

Subsequently, upon receiving the handoff completion message from the handoff block in the serving side ASS, it is confirmed that the call before the handoff is not a call by the intra jitter, and the intra side jitter for handoff is newly added to the serving second time switch 26. (40, 42).

Next, the handoff channel according to the second virtual time slot information described above and the intra jitter are connected, and the serving side speech channel and the intra jitter, which are connected to the other party's fixed subscriber call before being handed off according to the first virtual time slot information, are connected. A new handoff call path is established between the mobile subscriber call and the fixed subscriber call described above (44, 46).

At this time, the serving-side speech channel connected to the other party's call before the above-mentioned handoff occurs is performed by the path already formed before the handoff, that is, through the space switch 24 and the target side first time switch 22. It is connected to the fixed subscriber call described above.

As described above, according to the present invention, each operation of the space switch 24 in the mobile communication switch 4 and each of the first and second time switches 22 and 26 used in each ASS is performed by each mobile subscriber. And any fixed subscribers are talking through each ASS by allowing the subscribers to control stably through a simple and quick procedure according to the handoff between the first and second base station controllers 6 and 10 when the fixed subscribers are talking through each ASS. The time base station control period handoff is effected accurately.

Claims (3)

In each ASS connected to a plurality of base station controllers, a plurality of time slots and a plurality of link channels are provided. The link channel is connected to an intra jitter through a time switch connected to an intra jitter to provide a plurality of paths. In a mobile communication switching system connected to a switch: A first step of connecting a specific path of the space switch when the base station control period handoff occurs when any two subscribers are in a call through each ASS; Establishing a handoff channel of a serving side time switch using a link channel to connect with the specific path; Connecting the mobile call according to the handoff and the specific path through a target side time switch; A fourth step of confirming that the call before the handoff is not a call by the intra jitter; A base station control when busy within another ASS of the mobile communication switch, comprising a fifth step of establishing a new handoff call path between the two subscriber calls by connecting the handoff channel and the other subscriber call through an intra jitter on a serving side; Period handoff method. The method of claim 1, The third step may include: setting a speech channel of a target side time switch using a link channel to connect with the specific path; And setting a time slot of a target-side time switch to be connected with the mobile call and connecting with the speech channel, wherein the base station control period handoff method is during a call in another ASS of a mobile communication exchange. The method according to claim 1 or 2, The fifth step may include setting an intra jitter on the serving side time switch; Connecting the handoff channel and the intra jitter (302); And a step 303 of connecting the intra-junction and the serving-side speech channel connected to the other subscriber's call before the handoff is performed.