KR20000002162A - Traffic mode setting method when applying hard hand-off between mobile switching center - Google Patents

Abstract

PURPOSE: A traffic mode setting method when applying a hard hand-off between mobile switching centers is provided to prevent the call between mobile switching centers from cutting by applying a hard hand-off between mobile switching centers as using together with a vocoder having another vocoding algorithm. CONSTITUTION: The traffic mode setting method when applying a hard hand-off between mobile switching centers comprises the steps of: deciding if a serving vocoder of a receiving side's base station call, exists by practicing the hard hand-off when progressing the call between mobile stations so as to abstract the traffic mode value when demanding the hard hand-off between the mobile switching centers from the mobile switching centers; applying the hard hand-off after delivering the traffic information to a sending or a receiving position by applying a service negotiation to a voice channel if the serving vocoder doesn't exist; and allotting the source of the relevant serving vocoder while applying the hard hand-off if the serving vocoder exists.

Description

How to set traffic mode during hard handoff

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 a different vocoding algorithm to prevent call disconnection between exchanges by performing a hard handoff during the exchange. It relates to a method for doing so.

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, which include hard handoff, inter-frequency handoff, and inter-frame handoff during the exchange. There is an off, 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? This is a problem. It had a problem of when it was possible to process the system and at exactly what moment it changed the vocoder algorithm 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 vocoder having different vocoding algorithms to perform hard handoff during the exchange period, thereby making a call between exchanges. The present invention provides a method of setting a traffic mode during a hard handoff during an exchange to prevent truncation.

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,

Performing a hard handoff during the exchange between mobile stations, extracting a traffic mode value when the hard handoff is requested from the exchange to determine whether the destination BSC is serviceable; If there is no serviceable vocoder, performing service negotiation on a voice channel to transmit traffic information to an originating or destination point, and then performing a hard handoff during an exchange period; If the serviceable vocoder is present, the technical configuration is characterized by allocating resources of the serviceable vocoder and performing a hard handoff period.

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

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

<Explanation of symbols for main parts of the drawings>

10: exchange 11: ASP

12: INP 13: CCP

20: base station 30: mobile station

Hereinafter, with reference to the accompanying drawings, an embodiment according to the technical idea of the traffic mode setting method during the hard exchange period of the present invention configured as described above in detail as follows.

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 the service negotiation information based on the combination. In addition, the mobile station 30 passes the bypass information toward the source at the end of service negotiation, thereby enabling 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 in the figure, when a call between mobile stations 30 proceeds, a hard handoff is performed between the exchangers 10, and a traffic mode value is extracted from the exchange 10 when a hard handoff request is made during the exchange period. Determining the presence or absence (ST1-ST4); If there is no serviceable vocoder, performing service negotiation on a voice channel to transfer traffic information to an originating or destination point and then performing a hard handoff during the exchange period (ST15-ST9) (ST11); If there is a serviceable vocoder, it allocates resources of the serviceable vocoder and performs hard handoff in the exchange period (ST10).

In this case, the service negotiation is performed through the voice channel, and the traffic information is transmitted to the exchanger 10 of the source or destination party, and then the hard handoff is performed during the exchange period (ST15 to ST9) (ST11). Allocating a resource of the resource and allowing the CCP 13 to recognize a change in the traffic mode (ST5); When the CCP 13 recognizes the change of the traffic mode, performing service negotiation with the terminal on the voice channel of the TSB (ST6); When the hard handoff completion is received from the voice channel of the TSB after the service negotiation, the CCP 13 confirms the change of the traffic mode, and transmits the traffic mode information to the switch 10 (ST7) (ST8); The switch 10 receives the traffic mode information and transmits the traffic mode information to the switch 10 of the originating or destination point, and then performs a hard handoff during the exchange period (ST9).

Thus, if a call between mobile stations 10 is in progress, if the vocoder of the originating call is EVRC (Enhanced Variable Rate Coder) and the vocoder of the destination call is EVRC, 8K QCELP ( If a hard handoff is performed with an exchange 10 having a Qualcomm Code Excited Linear Prediction, the system using a 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 voice channel after allowing the voice channel to perform service negotiation, the CCP 13 of the target originates when the hard handoff completion is received from the voice channel. The traffic mode change information of the target side is checked to the side or the called party.

Then, the switch 10 transmits the changed traffic mode at this point to the switch 10 so that the switch 10 can recognize the change in the traffic mode. The switch 10 transmits the traffic mode change signal to the calling party or the called party to inform the traffic mode between the mobile stations 30. The hard handoff is performed during the normal exchange.

As such, the present invention enables mixed use of vocoders with different vocoding algorithms to prevent call truncation between exchanges by performing hard handoff during the exchange period.

The present invention is not limited to hard handoff during the exchange period, but may be applied to a system using different vocoding between several 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 the preferred embodiment of the present invention has 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 does not limit the scope of the invention as defined by the limitations of the following claims.

As described above, the traffic mode setting method for hard handoff during the exchange period according to the present invention prevents call truncation between exchanges by enabling a hard handoff during the exchange by allowing vocoder with different vocoder algorithms to be mixed. It enables the service to be better and higher quality, and even if it has different vocoder algorithms when interworking between operators, the hard handoff is possible.

Claims (2)

Performing a hard handoff during the exchange between mobile stations, extracting a traffic mode value when the hard handoff is requested from the exchange to determine whether the destination BSC is serviceable; If there is no serviceable vocoder, performing service negotiation on a voice channel to transmit traffic information to an originating or destination point, and then performing a hard handoff during an exchange period; And if the serviceable vocoder is present, allocating resources of the serviceable vocoder and performing a hard handoff during the exchange period. The method of claim 1, wherein the service negotiation is performed through the voice channel to transmit traffic information to an exchange of a calling party or a called party, and then performing a hard handoff during the switching period. Allocating resources of a corresponding vocoder without a serviceable vocoder and allowing the CCP to recognize a change in traffic mode; Performing service negotiation with a terminal on a voice channel of a TSB when the CCP recognizes a change of a traffic mode; When the hard handoff completion is received from the voice channel of the TSB after the service negotiation is completed, confirming the change of the traffic mode in the CCP, and transmitting the traffic mode information to the exchange; And transmitting the traffic mode information from the exchange receiving the traffic mode information to the exchange at the originating or terminating point, and then performing a hard handoff during the exchange period.