KR20030056135A - Method of delay compensate inter base transceiver station - Google Patents

Abstract

PURPOSE: A method for compensating an inter base station delay in an inter generation network is provided to execute a smooth hand-off between a 2.5G base station and a 2G base station connected with a CSM base station. CONSTITUTION: A hand-off between 2G base stations is executed and a success rate is measured(201). It is confirmed whether a hand-off between an operator station and a second 2G base station connected with a CSM(Cell Site Modem) base station succeeded(202). A basic parameter is confirmed together with output of the 2G base stations including a beacon signal(203). A cause of a call drop is analyzed by comparing a hand-off message between the 2G base stations with a hand-off message between 2G and 2.5G base stations(204,205). A parameter of the 2.5G base station is changed and a delay value of the hand-off between the 2G base stations is confirmed(206,208). The 2.5G base station is changed equal to the delay value between the 2G base stations(209).

Description

Method of delay compensation between base stations in intergenerational networks

The present invention relates to a method for compensating delay between base stations in an intergenerational network, and more particularly, to perform a smooth handoff with a 2G base station associated with a CSM base station by adjusting parameters and delay values of a base station of 2.5G. And a computer-readable recording medium having recorded thereon a program for realizing the method.

In general, a cellular mobile communication system divides an entire service area into a plurality of base station (BS) areas, constitutes cells, which are small service areas, and centrally controls such base stations to a mobile switching center. A mobile station, i.e., a terminal, is capable of continuing a call while moving between cells. In particular, in a cellular system, when a terminal leaves a cell of a base station and enters a new cell, a call may be continued by the handoff function, and for this purpose, a procedure called location registration is performed.

Therefore, the cellular mobile communication system requires an organic switching operation between the mobile station and the base station, the base station controller and the switching station.

Usually, when a terminal is assigned a channel of a base station and performs call processing, call progress is stopped or incoming and outgoing is not normally performed due to various obstacle factors.

In particular, with the advent of 2.5G system for ultra-high speed data communication, there is a frequent decrease in the transmission degradation rate between the exchange stations during the existing 2G system and the call processing operation, and the 2.5G system is a CSM (cell site modem: There is a problem in that call drop occurs due to chip delay between base stations during call processing of a 2G system equipped with Cell Site Mode).

Accordingly, the present invention has been made to solve the conventional problems as described above, by adjusting the parameters and delay value of the 2.5G base station to perform a smooth handoff with the 2G base station associated with the CSM base station. It is an object of the present invention to provide a method for compensating delay between base stations in a network and a computer-readable recording medium recording a program for realizing the method.

1 is an exemplary configuration diagram for explaining inter-base station delay compensation in an inter-generation network to which the present invention is applied.

2 is a flow chart of an embodiment of an inter-base station delay compensation method in an inter-generation network according to the present invention.

※ Explanation of code for main part of drawing

100: Cell Site Modem (CSM)

110,120: 2G base station 115: 2.5G base station

130: 2G base station controller 135: 2.5G base station controller

140; 2G Exchanger 145: 2.5G Exchanger

150: operating station

The method of the present invention for achieving the above object, in the inter-base station delay compensation method in the inter-generation network, measuring the handoff success rate between 2G base stations based on IS 95A, and based on the measured success rate CSM (Cell) Site Modem) A first step of comparing the handoff success of the base station; Identifying a parameter in use of the 2G base station and analyzing a cause of a call drop by comparing a handoff message between the 2G base stations and a handoff message between the 2G base station and the next generation base station; And a third step of changing the parameter of the next-generation base station and the same as the delay value between the 2G base stations by the analyzed result.

Meanwhile, in order to compensate for delay between base stations, a handoff success rate between 2G base stations based on IS 95A is measured in a mobile communication system having a processor, and whether the cell site modem (CSM) base station is handed off successfully based on the measured success rate. A first function of comparing; A second function of checking a parameter in use of the base station and analyzing a cause of a call drop by comparing a handoff message between 2G base stations and a handoff message between 2G base stations and next-generation base stations; And a computer-readable recording medium having recorded thereon a program for realizing the third function of changing the parameters of the next-generation base station and the same as the delay value between the 2G base stations based on the analyzed results.

Hereinafter, a preferred embodiment of an inter-base station delay compensation method in an inter-generation network according to the present invention will be described in detail with reference to the accompanying drawings.

1 is a diagram illustrating a configuration for explaining inter-base station delay compensation in an intergenerational network to which the present invention is applied.

As shown in FIG. 1, in the system configuration, reference numeral 100 denotes a Cell Site Modem (CSM), 110 and 120 denote a first and a second 2G base station controller (2G BTS), and 130 2G Base Station Controller (BSC), 140 is 2G Switching Center (MSC), 150 is Base Station Manager (BSM), 115 is 2.5G Base Station, 135 is 2.5G Base Station Controller, 145 is It is a 2.5G exchanger

Here, the cell site modem 100 is connected to the second 2G base station 110, and has about 12 to 16 (or more) chips called channel elements that perform modulation and demodulation functions on a board called a channel card. It is mounted. Here, one CSM forms one channel. When a channel element is allocated for a user in the call processing block of the control station, the channel element is allocated using only the number of the channel element, and the user can use it.

The second 2G base station 120 to which the first 2G base station 110 and the CSM 100 are linked performs call processing, location registration, and handoff of a terminal in its service area. By hand off.

The operator station 150 measures the success rate at the time of handoff at the second 2G base station 120 to which the first 2G base station 110 and the CSM 100 are linked, and identifies basic parameters currently in operation.

In addition, the operating station 150 transmits a handoff message between the first 2G base station 110 and the second 2G base station 120 to which the CSM 100 is linked, the second 2G base station 120 to which the CSM 100 is linked. And the message upon handoff of the 2.5G base station 115.

At this time, the cause of the call drop between the base stations (Call Drop) is analyzed, and in particular, the needle delay between base stations is compared.

According to the comparison result, the delay of the 2.5G base station is compensated. As a specific example, first, a delay value between the first 2G base station 110 and the second 2G base station 120 is measured. The delay value between the second 2G base station 120 and the 2.5G base station 115 is measured. Therefore, when the 2.5G base station generates 19 chips in system delay compared to the 2G base station, the delay value between the 2.5G base station 150 and the second 2G base station is represented by Equation 1 as follows.

2.5G-2G delay = 2G-2G delay + 19 Chip

That is, the call drop can be eliminated by changing the delay adjustment of the 2.5G base station to be equal to the chip delay between 2G.

In addition, it is possible to solve the problem caused by chip delay by installing a terminal mobility datastore (TMD) to compensate for the delay of the base station operating the CSM.

2 is a flowchart illustrating a method for compensating for delay between base stations in an inter-generation network according to the present invention.

As illustrated in FIG. 2, in order to solve a problem caused by a call drop occurring during CSM linkage among 2G base stations, the system state is checked, and compensation according to delay is performed.

First, in checking the base station, performing a handoff between the 2G base station to measure the success rate (201), the second 2G base station 110, which is a 2G base station to which the operator station 150 and the cell site modem 100 are linked. In step 202, whether the handoff is successful or not.

Thereafter, the basic parameters are checked together with the output of the 2G base station including the beacon signal (203), and the cause of the call drop is analyzed by comparing the handoff message between the 2G base stations with the handoff message between the 2G base stations and the 2.5G base station ( 204,205).

In this case, the chip delay between the base stations is compared in the cause analysis.

On the other hand, when checking at the base station controller side, the parameter of the 2.5G base station 115 is changed, and the delay value is confirmed at the time of handoff between 2G after changing 19 (default) of CLK_ADV to 0 or 10 (206, 207). ).

Here, when the 2.5G base station has a system delay value of 19 as compared to the 2G base station, the 2.5G base station adds 19 as a default value to the delay value between the 2G base station between the 2.5G base station and the 2G base station. .

Accordingly, the 2.5G base station is changed to equal the delay value between the 2G base stations (208). This eliminates call drops between base stations operating CSMs.

As mentioned above, preferred embodiments of the present invention are disclosed for the purpose of illustration, and those skilled in the art can improve and change various other embodiments within the spirit and technical scope of the present invention disclosed in the appended claims below. , Replacement or addition would be possible.

The inter-base station delay compensation method in the inter-generation network made as described above is a useful invention that can perform a smooth handoff with the 2G base station associated with the CSM base station by adjusting the parameters and delay values of the 2.5G base station.

Claims (2)

In the inter-base station delay compensation method in an intergenerational network, A first step of measuring a handoff success rate between 2G base stations based on IS 95A, and comparing handoff success of a CSM base station based on the measured success rate; Identifying a parameter in use of the 2G base station and analyzing a cause of a call drop by comparing a handoff message between the 2G base stations and a handoff message between the 2G base station and the next generation base station; And The third step of changing the parameters of the next-generation base station and the same as the delay value between the 2G base station based on the analyzed result The base station delay compensation method in an inter-generation network comprising a. In the mobile communication system having a processor for delay compensation between base stations, A first function of measuring a handoff success rate between 2G base stations based on IS 95A, and comparing the handoff success of a CSM (Cell Site Modem) base station based on the measured success rate; A second function of checking a parameter in use of a base station and analyzing a cause of a call drop by comparing a handoff message between a 2G base station and a handoff message between a 2G base station and a next generation base station; And A third function of changing the parameters of the next generation base station and the same as the delay value between the 2G base stations according to the analyzed result A computer-readable recording medium having recorded thereon a program for realizing this.