KR20010055409A - Bearer channel assignment and management method of wire exchanger - Google Patents

Abstract

PURPOSE: A bearer channel allocation and managing method of a medium and small capacity wire switch are provided to allocate and manage an AN-based bearer channel for processing a call using a V5.2 interface when a WLL subscriber requests an outgoing call or incoming call for thereby forming a communication path between a wire switch and a WLL subscriber and providing a PSTN cooperated service to a WLL subscriber of multiple AN. CONSTITUTION: A certain information is read from a database when initializing a system in a system library CSL(Call processing Shared Library), and an AN-based bearer channel information is formed based on a linked-list structure, and a point indicates a bearer channel information for transferring to a user block when a bearer channel allocation is requested(S2). An idle bearer channel is searched through a system library procedure defined when setting an outgoing call and incoming call, and a state information with respect to an idle bearer channel is changed an in-use state using a system library(S3). When a bearer channel receives a report that a service is not provided based on an operator's request or error from a resource management block, a bearer channel information is excluded from a linked-list structure(S4). When a service is available by a recovery, a bearer channel information is added(S5).

Description

Bearer channel assignment and management method of small and medium capacity wired switch

The present invention relates to a TCS-W (Telephony Control Subsystem-WLL) subsystem that provides a matching function for a WLL (Wireless Local Loop) system in a small to medium capacity wired switch. The present invention relates to a method for allocating and managing a bearer channel in a small and medium-capacity wired switch that can configure a call path by allocating and managing a bearer channel for each access network.

In the conventional wired subscriber network, a subscriber service is provided to a wired subscriber living in a small urban area or a low-density area instead of a large urban area by using a physical line, that is, a wired subscriber line, between the wired switch and the wired subscriber.

However, when providing a subscriber service in the wired subscriber network, there is a problem in that the wired subscriber line installation cost takes a lot of installation time as well as the wired subscriber line between the wired switch and the wired subscriber.

Accordingly, in the small and medium-capacity wired switch of the wired subscriber network, which is conventionally based on the matching function for the wired subscriber, the matching function for the WLL system is maintained while maintaining the consistency of the functions of the entire subsystems in the exchange with minimal modification. We have implemented an additional subsystem of TCS-W.

That is, as shown in FIG. 1, the small-capacity wireline exchanger includes a Telephony Control Subsystem-Switch (TCS-S) 10, a Telephony Control Subsystem-ISDN (TCS-I) 20, and a Central Control Subsystem (CCS) 30. ), Interconnection Network Subsystem (INS) (40), Telephony Control Subsystem-Trunk (TCS-T) (50), and Telephony Control Subsystem- (TCS-7), which are connected via a public switched telephone network (PSTN) and a PCX with an E1 link. No.7) (60), consisting of TCS-W (70) connected through AN and E1 link and providing matching function for WLL system, provides wireless subscriber line between wired switch network of wired subscriber network and WLL subscriber. It was made.

However, unlike wired subscribers in wired subscriber networks, WLL subscribers are not physically fixed to wired exchanges and lines, so that wired exchanges receive outgoing call setup requests from WLL subscribers or incoming call setup requests to WLL subscribers. In this case, a bearer channel allocation function for configuring a call path is required.

The present invention has been made in view of the above, and an object thereof is to provide a matching function for a WLL system in a small-capacity fixed-line switch, and when the outgoing call setup or incoming call setup request is requested from a WLL subscriber, .2 By assigning and managing bearer channels for each AN to perform call processing using the interface, a call path can be configured between the wired switch and the WLL subscribers, thereby providing PSTN interworking services to WLL subscribers of multiple ANs. The purpose of the present invention is to provide a bearer channel allocation and management method in a medium and small capacity wired switch.

1 is a block diagram of a typical small-capacity wireline exchanger,

2 is a view showing a software structure of the TCS-W in the small-capacity wireline exchange of FIG. 1;

3 is a flowchart illustrating a method for allocating and managing a bearer channel in a small-capacity wired switch according to the present invention.

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

70: TCS-W 71: V5SC

72: V5DH 73: V5SA

74: RM 75: V5SI

76: LAPV5-DL LAPV5-EF 77: C64

In order to achieve the above object, a bearer channel allocation and management method in a small-capacity fixed line switch according to the present invention is an AN to which the corresponding WLL subscriber belongs whenever an outgoing call setup or an incoming call setup is performed when the subscriber type is a WLL subscriber in the small-capacity wireline exchange. Search for a bearer channel allocated within the network and select and allocate an idle bearer channel.

Hereinafter, a bearer channel allocation and management method in a small-capacity wired switch according to the present invention will be described in detail with reference to the accompanying drawings.

FIG. 2 is a view showing the software structure of the TCS-W 70 in the small and medium-capacity wireline switch shown in FIG. 1, wherein a V5.2 Subscriber Control (V5SC) 71 and a V5DH (V5. 2 Data Handling (72), V5.2 Subscriber Adaptation (V5SA) 73 for performing interface functions with an application program, Resource Management (RM) 74, and V5SI for controlling an actual device. (V5.2 Subscriber Interface) 75, LAPV5-DL (Link Access Protocol for V5 interface Data Link layer) LAPV5-EF (Link Access Protocol for V5 interface Envelope Function) 76, and C64 (V5 Communication Channel) It consists of 77.

The V5SC (71), V5DH (72), V5SA (73), RM (74) are located in the main processor (MP), the upper processor, V5SI (75) is located in the PP (Peripheral Processor), the lower processor, Communication between the upper MP and the lower PP uses IPC (Inter Processor Communication).

The V5SA 73 is an interface block for the V5.2 protocol. The V5SA 73 receives a message from the V5SC 71, the V5DH 72, and the RM 74 of the upper MP and transmits the message to the V5SI 75 of the lower PP. 75) and receives a message from the upper MP V5SC (71), V5DH (72), RM (74).

In addition, the V5SI 75 processes a layer 3 part of an actual V5.2 protocol.

The bearer channel allocation and management method performed in the TCS-W 70 in the small and medium capacity wired switch configured as described above will be described with reference to the operation flowchart of FIG. 3.

First, the small and medium capacity wired switch stores bearer channel information for each AN for each AN connected to the TCS-W in a database in each subsystem (S1).

Next, the system library (CSL; Call Processing Shared Library) reads the necessary information from the database upon system initialization and structures the bearer channel information for each AN through a linked-list structure, and immediately next by using a pointer. When the bearer channel allocation request is made, the bearer channel information to be transmitted to the corresponding user block is indicated (S2).

Accordingly, each user block searches for an idle bearer channel through a predefined system library procedure for each outgoing call setup or incoming call setup, and uses the system library to obtain status information on the idle bearer channel. Change it to being used (S3).

At this point, the pointer is moved to point to the next bearer channel to which the assigned bearer channel is pointing.

Subsequently, when receiving a notification from the resource management block that the bearer channel cannot be serviced due to an operator's request or failure, the bearer channel information is excluded from the linked-list structure (S4).

Then, if the service becomes available again by the operator's request or failure recovery, the bearer channel information is added to the linked-list structure again (S5).

Therefore, it is possible to prevent a problem that may occur as a result of using a service that is not available.

As described above, the present invention provides a bearer channel for each AN for performing call processing by using a V5.2 interface when an outgoing call setup or an incoming call setup request is made from a WLL subscriber in a TCS-W in a medium-capacity wireline switch. By assigning and managing the call path between the wired switch and the WLL subscriber, the call path can be configured. Thus, the wireless subscriber line between the wired switch and the WLL subscriber can reduce the cost and time of wire installation and provide PSTN interworking services to the WLL subscribers of multiple ANs. It is possible to provide more efficient subscriber services, such as being able to provide.

Claims (1)

In a bearer channel allocation and management method for configuring a call path between a wired switch and a WLL subscriber in a small-capacity fixed-line exchange that additionally implements TCS-W providing a matching function for a WLL system, A first step of storing bearer channel information for each AN for the AN connected to the TCS-W in a database in each subsystem; When the system is initialized, the system library reads the necessary information from the database of the first step, structures the AN-specific bearer channel information through the linked-list structure, and transfers it to the corresponding user block at the next bearer channel allocation request using a pointer. A second step of pointing to bearer channel information for After performing the second step, each user block searches for an idle bearer channel through a predefined system library procedure whenever an outgoing call setup or an incoming call setup is performed, and the status information on the idle bearer channel is used as a result of the search. The third step, A fourth step of excluding the bearer channel information from the linked-list structure when receiving a notification from the resource management block that the bearer channel cannot be serviced due to an operator's request or failure; After performing the fourth step, when the service is available by the operator's request or failure recovery, the fifth step of adding the corresponding bearer channel information to the linked-list structure in the small and medium capacity wired switch, characterized in that Bearer channel allocation and management method.