KR100297253B1 - Method for setting traffic mode during hard hand-off among exchange - Google Patents

Abstract

The present invention is to prevent a call disconnection between exchanges by performing a mixed exchange hard handoff by enabling a mixed use of vocoders having different vocoding algorithms. When the off request occurs, the traffic mode value is extracted, the presence or absence of serviceable vocoder of the destination BSC is determined, and as a result, if there is no serviceable vocoder, the TSB performs service negotiation and delivers the traffic information from the exchange to the originating or destination point. Hard handoff is performed during the next exchange. In addition, if there is a serviceable vocoder, it allocates resources to the serviceable vocoder and performs hard handoff during the exchange, thereby preventing call disconnection between exchanges and allowing users to enjoy better and higher quality service.

Description

Method for setting traffic mode during hard hand-off among exchange}

The present invention relates to a hard hand-off of a mobile communication exchange, and in particular, it is possible to use a vocoder having different vocoding algorithms when performing a hard handoff during the exchange period, thus preventing call disconnection between the exchanges. On how to prevent them.

In general, a mobile communication system is a communication system for a mobile device such as a person, a car, a ship, or an aircraft, and includes a personal communication system (PCS) system, a digital cellular system (DCS), and a digital frequency. Public communication system (DTRS, Digital Trunked Radio System) is used.

1 is a block diagram of a general mobile communication system.

As shown therein, an Access Switching Processor (ASP) 11 performing a subscriber switching function, an INP (Interconnection Network Processor) performing a centralized call processing and a network synchronization function, and a network control processor 12; It performs CCP (Call Control Processor) which performs the operation maintenance of the system and various statistical functions, controls and manages the hard disk and auxiliary memory, controls input / output from the operator, and connects data channels with other systems. (13), and transmits the call processing request of the mobile station 30 to a public switched telephone network (PSTN) or an advanced mobile phone service (AMPS) and other communication networks through a public network or a dedicated network. A mobile switching center (MSC) 10 capable of making a call, and a base station (BTS) transmitting a call transfer request of the switch 10 to the mobile station 30; nsceiver station (20), and a mobile station (MS) 30 that transmits a call transmission request to the base station 20 and operates while stopping at a point that is not moved or specified.

In the general mobile communication system configured as described above, if the subscriber intends to use the mobile communication service while having the mobile station 30 within the service radius of the switch 10, the switch 10 uses the home / visitor location register. 30), and performed to perform a mobile communication service by performing a voice / fax information service or connecting to another communication network according to the request of the mobile station (30).

A general handoff process in such a mobile communication system is as follows.

First, when the strength of the pilot of each base station 20 / sector sensed by the mobile station 30 exceeds the threshold value or the existing one falls below the threshold value, information of the pilot strength is transmitted to the base station 20. The base station 20 then sends this information to the exchange 10, which determines which base station / sector to handoff based on this and instructs the mobile station 30 to handoff. The mobile station 30 sends a handoff complete message to the base station 20 after performing the handoff. The exchange 10 reports the completion of the handoff from the base station to complete a series of handoff processes.

These handoffs are roughly divided into hard hand-off, soft hand-off, and softer hand-off. Among them, hard hand-off is a hard handoff and an inter-frequency handoff and a frame during the exchange. There is inter-handoff, soft handoff is base station and softer handoff is intersector handoff.

Here, the conventional hard handoff between the exchangers 10 has been developed using one vocoding scheme and has various problems to bypass the other vocoding scheme between two different systems.

In other words, at what point do you pass the vocoder algorithm? It had a problem of when the system could handle it, when it was notified at exactly what moment it was, and how to pass that information to the source.

Accordingly, the present invention has been proposed to solve the conventional problems as described above, and an object of the present invention is to enable a mixed use of vocoders having different vocoding algorithms when performing hard handoff during the exchange period. The present invention provides a method of setting a traffic mode during a hard handoff during an exchange to prevent disconnection.

In order to achieve the above object, the traffic mode setting method in the hard period during the exchange period according to the present invention,

Extracting a traffic mode value when a hard handoff request is generated during an exchange between mobile stations;

Checking whether there is a serviceable vocoder in a called party BSC (CCP) after extracting the traffic mode value;

Allocating a vocoder resource if there is a serviceable vocoder as a result of the confirmation, notifying the TSB that the hard handoff is allocated, and then performing a hard handoff during the exchange period;

If there is no service vocoder as a result of the check, if the service negotiation is performed in the TSB and the hard handoff completion message is received, the exchange transfers the traffic mode information to the originating or destination point and then performs the hard handoff period. It is characterized by.

1 is a block diagram of a general mobile communication system,

2 is a flowchart illustrating a traffic mode setting method in a hard handoff period during an exchange according to the present invention.

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

10: exchange 11: ASP

12: INP 13: CCP

20: base station 30: mobile station

Hereinafter, a preferred embodiment of the present invention according to the technical spirit as described above will be described in detail with reference to the accompanying drawings.

First, the conventional hard handoff method between exchanges 10 has vocoder information allocated when vocoder resource allocation for each service option is performed. This information has a combination of the service option value received from the mobile terminal 30 and the information of the assigned vocoder.

Thus, the present invention creates service negotiation information based on this combination value. In addition, at the end of service negotiation in the mobile station 30, the bypass information is passed to the source to enable bypass between the two systems.

2 is a flowchart illustrating a traffic mode setting method in a hard handoff during an exchange period according to the present invention.

As shown therein, the call proceeds between the mobile stations 30 in step ST1.

In step ST2, a hard handoff is performed between the exchangers 10, and in step ST3, a traffic mode value is extracted when a hard handoff request is made during the switching period.

In step ST4, the presence or absence of a serviceable vocoder of the called party BSC (CCP) is determined. As a result, if a serviceable vocoder exists in the destination BSC, the vocoder resource is allocated in step ST10, and the hard handoff allocation is transmitted to the TSB.

Then, the exchange period hard handoff is performed in step ST11.

If there is no serviceable vocoder in the destination BSC as a result of the vocoder check in step ST4, the hard handoff allocation is transmitted to the TSB, and the BSC (CCP) traffic mode change is recognized.

In step ST6, service negotiation is performed in the TSB. In step ST7, when service negotiation is performed in the TSB, a hard handoff completion message is received.

In step ST8, the BSC (CCP) traffic mode change is confirmed, and the traffic mode information is transmitted to the exchange.

In step ST9, the traffic mode information is transmitted from the exchange to the originating or destination point, and in step ST11, a hard handoff is performed during the exchange.

For example, if a call between mobile stations 10 is in progress, if the vocoder of the originating call is an enhanced variable rate coder (EVRC), and the vocoder of the destination call is an EVRC, among the dual originating or receiving call. If a hard handoff is performed with an exchanger 10 having an 8K Qualcomm Code Excited Linear Prediction (QCELP), the system using the bypass has to be changed to transcoding. At this time, the method of catching this information is as follows.

First, when the exchange 10 of the target side requests a hard handoff during the exchange period, the vocoder resource is allocated. During this allocation process, the CCP 13 knows which vocoder is currently available for service. .

That is, if only 8K QCELP vocoder is available during the exchange period hard handoff at the calling party or the called party in the call between the mobile stations 10, the CCP 13 allocates 8K QCELP resources, and the TSB (Transcoding Selector Bank) After receiving the service negotiation response from the TSB after allowing the voice channel to perform service negotiation, the CCP 13 of the target receives the hard handoff completion message from the TSB. Or, the destination side checks the traffic mode change information of the target side.

And by transferring the changed traffic mode at this point to the exchange 10, the exchange 10 can recognize the change in traffic mode. Recognizing the change of the traffic mode, the exchange transmits the traffic mode change signal to the calling party or the called party to adjust the traffic mode between the mobile stations 30 so that a hard handoff is performed during the normal switching period.

As described above, the present invention can be used with vocoders having different vocoding algorithms, thereby preventing call disconnection between exchanges during hard handoff.

The present invention is not limited to hard handoff during the exchange period, but may be applied to a system using different vocoding between multiple operators. It is also possible to apply a hard handoff between control stations (BSC, Base Station Controller) at the same exchange. In addition, the vocoder algorithm may be used in various ways such as 8K QCELP, 13K QCELP EVRC. Traffic modes can be used in line with service options. That is, the traffic mode can be distinguished by the service option.

Although preferred embodiments of the present invention have been described above, the present invention may use various changes, modifications, and equivalents. It is clear that the present invention can be applied in the same manner by appropriately modifying the above embodiments. Accordingly, the above description will be made clearer based on the following claims.

As described above, the traffic mode setting method during the hard handoff in the exchange period according to the present invention enables vocoders having different vocoder algorithms to be mixed to enable hard handoff during the exchange, thereby preventing call disconnection between exchanges. It enables users to receive better and higher quality services, and even if they have different vocoder algorithms when interworking between operators, hard handoff is possible.

Claims (1)

In the method of performing a hard handoff period, Extracting a traffic mode value when a hard handoff request is generated during an exchange between mobile stations; Checking whether there is a serviceable vocoder in a called party BSC (CCP) after extracting the traffic mode value; Allocating a vocoder resource if there is a serviceable vocoder as a result of the confirmation, notifying the TSB that the hard handoff is allocated, and then performing a hard handoff during the exchange period; If there is no service vocoder as a result of the check, if the hard handoff complete message is received after performing service negotiation in the TSB, the exchange transfers the traffic mode information to the originating or destination point and then performs the hard handoff period. Traffic mode setting method during the hard handoff period of exchange characterized in that it is made.