KR19980026345A - Redundancy Control Method of RFC in Base Station of CDMA System - Google Patents

Abstract

The present invention relates to a duplex control method of RFCs in a base station of a CDMA system, and to overcome the problem of affecting the entire call when an error occurs in one RFC. Determining whether it is a redundant RFC at power-on; If it is a redundant RFC, it disables the address search mode, disables the transmit request signal (RTS), initializes the SCC chip, and receives all the information sent from the higher-level BCP. A data processing step of waiting for an interrupt signal; An error detection process of generating a transfer request interrupt signal if an error is generated according to a change of an error state when the self is not a redundant RFC, and generating a recovery request interrupt request signal upon recovery; By providing a redundant control method of RFC in base station of CDMA system to perform interrupt handler process for switching and recovery control in response to interrupt request signal sent from the above-mentioned general RFC when it is redundant RFC. Therefore, even if one error occurs, the effect on the whole system is minimized.

Description

Redundancy Control Method of RFC in Base Station of CDMA System

1 is a block diagram of an RFC and its peripheral block for applying a method of controlling redundancy of RFC in a base station of a CDMA system according to the present invention.

2 is a control flow diagram showing an error detection process according to the present invention.

3 is a control flowchart showing an interrupt handling process according to the present invention.

4 is a control flowchart showing an error recovery process according to the present invention.

5 is an overall control flowchart showing a method of controlling redundancy of RFC according to the present invention.

Explanation of symbols on the main parts of the drawings

10: redundant TSU20: normal TSU

30: RFIA40: BCP

The present invention relates to a redundant control method of a radio frequency controller (RFC) in a base station of a code division multiple access (CDMA) mobile communication system. The present invention relates to a switching between a single redundant RFC and several RFCs present in the sector and The present invention relates to a method for controlling redundancy of RFCs in a base station of a CDMA system that enables recovery to be maintained continuously.

In general, in a CDMA mobile communication system, replacement and recovery of RFCs existing in the same sector in a base station is required, and a redundant RFC is used for this purpose.

However, when one error occurs during the transfer and recovery between the conventional RFCs and the redundant RFC, it affects the entire system, making it difficult to perform a smooth transfer and recovery, and it is difficult to process in real time.

It is an object of the present invention to provide a redundant control method of an RF in which one error does not affect the entire call in view of such a problem.

According to the present invention, if an error occurs in one of the RFCs in operation, the switchover to the redundant RFC can be performed smoothly without affecting the entire call, and when the error is recovered, the redundant RFC can be smoothly returned to the redundant one. To deal with.

The present invention determines whether it is a redundant RFC at power-on, and if it is a redundant RFC, initializes the SCC chip differently from the general RFC, processes data to receive all data transmitted from the BCP, and detects an error state if not a redundant RFC. This is achieved by generating a transfer request interrupt or recovery request interrupt signal and performing a transfer process or a recovery process based on the interrupt request signal in the redundant RFC.

According to the present invention as described above it is possible to minimize the effect on the entire call even when an error occurs.

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings.

FIG. 1 is a block diagram illustrating RFCs and neighboring blocks for explaining a method of controlling switching and recovery between one redundant and multiple RFCs according to the present invention.

RFCs exist in Transceiver Switching Units (TSUs) in CDMA base stations. The TUS consists of an upconverter and a downconverter in addition to the RFC.

In the present invention, one redundant TSU 10 and a plurality of generic TSUs 20 communicate with the RFIA 30 in a multidrop manner, and the RFIA 30 is connected to a higher level BCP 40.

The present invention performed by the RFC and its neighboring blocks in the TSU configured as described above comprises: an error detection process; An interrupt handler process; Data processing; It is divided into recovery process.

The error detection process is performed by the above-described general RFC, as shown in the error detection control flowchart according to FIG.

The error detection process is performed by a general RFC, and determines whether an error has occurred at a predetermined period, and then, when an error is detected, notifies the upper level BCP, and generates a switch request interrupt with a redundant RFC. If the error is restored to normal, a recovery request interrupt is generated by the redundant RFC and the process returns to the original RFC.

The step of determining whether the error has occurred is called every predetermined period to determine whether the error state has changed from before, and then, if the error state is not an error when there is a change from the previous state, whether the error has returned to normal. Judge. The step of generating a transfer request interrupt to the RFC is an SCC with an HDLC address that generates an interrupt for the transfer request to a redundancy in case of an error and adds 16 to its own address when there is an acknowledgment signal for the interrupt. After initializing the chip, it enters the standby state.

The generating of the recovery request interrupt is not an error when the error is restored to a normal state or replaced with a new board when the error state is changed. Therefore, a recovery request interrupt is generated and the SCC is transmitted to its own address. It initializes the chip, requests its config data from the higher level BCP, configures it with this data, and reports the recovery to the BCP.

As such, when an error occurs in a general RFC, an interrupt for switching to a redundant RFC is generated, and a recovery request interrupt is generated during recovery.

The interrupt handler process, which performs switching and recovery in response to the interrupt, is performed by the redundant RFC.

First, when an interrupt is generated, a step of determining which RFC caused the interrupt is performed, and if it is a redundant state, if it is a redundant state, it is the data of the RFC that requested the interrupt from the stored configuration data. Follow the steps to configure the environment. Subsequently, performing the step of initializing the SCC chip to the HDLC address of the RFC requesting the interrupt, sending a recognition signal to the corresponding RFC, and switching to the DISC (Distribution Combiner Shelf) to switch the RF output switch to itself, Follow the steps to report to the BCP.

In addition, in the step of determining which RFC caused the interrupt, if it is not in a redundant state, it is determined whether it is the same as the RFC that requested the interrupt most recently, and the recovery process is performed only in the same case.

The above recovery process initializes the SCC with a redundant address and disables the address search mode at this time.

Subsequently, it is determined whether the RFC requesting the interrupt is ACTIVE, and only when the active signal is received, the DICS is requested to switch to the original RFC to complete the recovery and report to the BCP.

This is because the restored RFC sends an ACTIVE signal to the redundant RFC to indicate that it is active. Thus, the ACK signal and the ACTIVE signal optimize the DICS switching time to minimize the effect on the entire system.

The data processing is performed at the redundant RFC and stores the configuration data received from the BCP of RFCs in the same sector as itself.

In addition, as shown in FIG. 4, when the RFC is powered on, the RFC determines whether the RFC is redundant. If the RFC is redundant, the SCC chip is initialized differently from the general RFC as follows.

First, it disables the address search mode of channel A to receive all information sent by the higher level BCP.

Second, the transmission request signal (RTS) is disabled to prevent transmission (Tx).

In this way, when the SCC is initialized, the redundant RFC receives all data packets sent from the BCP to the RFC. Among these packets, only the configuration data of RFCs in the same sector as the HDLC address of the packet are stored and provided to the interrupt handler.

This is to minimize the effect on the whole call by minimizing the time required during the transfer process.

The reason why the transmission request signal (RTS) is disabled to prevent the transmission of the redundant RFC is that the RFIA (Radio Frequency Interface Card Assey) and the RFCs communicate in a multi-drop method.

That is, all RFCs receive the same message but check the HDLC address and receive only the message with the same address.

For this reason, the polling signal sent from the RFIA also receives the redundant RFC because the redundant RFC does not compare addresses, and transmits a response thereto.

This results in the loss of data because two responses exist at the same time. To prevent this, the transmission request signal of the SCC of the redundant RFC is disabled.

Therefore, according to the present invention, as shown in FIG. 4, it is determined whether the power is a redundant RFC, and if it is a redundant RFC, the address search mode of the SCC chip is disabled and the interrupt request signal is waited for.

If it is not a redundant RFC, it sends an active signal to the redundant RFC during normal operation to indicate normal operation. If an error is detected when the error state changes, an interrupt request signal is generated and an interrupt request signal is sent to the redundant RFC. Wait

When the error state is returned, the error recovery request interrupt signal is sent to the redundant RFC and the recovery process is performed.

On the other hand, the redundant RFC performs the switching process and the recovery process based on the interrupt request signal, and waits for the interrupt port.

As described in detail above, according to the present invention, when an error occurs in one of the operating RFCs, the switchover to the redundant RFC is performed smoothly without affecting the entire call, and when the error is recovered, the error can be smoothly returned to the redundant. This has the effect of minimizing the impact on the entire call.

It is also very efficient because one redundant RFC can handle multiple RFCs.

Claims (6)

Determining whether it is a redundant RFC at power on; If it is a redundant RFC, it disables the address search mode, disables the transmit request signal (RTS), initializes the SCC chip, and receives all the information sent from the higher-level BCP. A data processing step of waiting for an interrupt signal; An error detection process of generating a transfer request interrupt signal if an error is generated according to a change of an error state when the self is not a redundant RFC, and generating a recovery request interrupt request signal if a recovery occurs; In the case of the redundant RFC, an RFC in the base station of the CDMA system, characterized in that to perform an interrupt handler process for switching and recovery control in response to the interrupt request signal sent from the general RFC. . The method of claim 1, wherein the error detection process comprises: It is executed in general RFC and called every cycle to determine whether the error state has changed from previous state, and to determine if the error state is an error or if the error has been restored to normal when there is a change from the previous state. In case of an error, generating an interrupt for the transfer request to the redundant, receiving an acknowledgment signal for the interrupt, initializing the SCC chip with the HDLC address plus 16 to its address, and then entering the standby state. Entering, in the case where the error is restored to the normal state or replaced with a new board, generating a recovery request interrupt, initializing the SCC chip with its own address, and the high-level BCP to its own configuration ( config) requests data and then configures this configuration data and then reports to BCP that the recovery is complete. Redundancy control method for a local RF base's (RFC) of the CDMA system, characterized in that configured to perform the system. The method of claim 1, wherein the interrupt handler process comprises: In the redundant RFC, if an interrupt is generated, the step of determining which RFC caused the interrupt, and determining whether it is a redundant state, and if it is a redundant state, of the RFC that requested the interrupt from the stored configuration data. Setting the environment with data, initializing the SCC chip to the HDLC address of the RFC that requested the interrupt, sending a recognition signal to the corresponding RFC, and requesting the DISC to switch the RF output switch to itself, A method for redundancy control of RFCs in a base station of a CDMA system, characterized by performing reporting to a higher level BCP. 4. The method of claim 3, wherein in the determining of which RFC caused the interrupt, it is determined whether the RFC is the same as the RFC that requested the interrupt most recently, when the RFC is not in the redundant state, and the recovery process is performed only when the RFC is the same. Redundancy control method of RFC in base station of CDMA system. The method of claim 1, wherein the recovery process, Initializes the SCC with a redundant address, disables the address search mode, determines if the RFC requesting the interrupt is active, and requests recovery to the original RFC by requiring DICS to switch to the original RFC only when an active signal is received. A method for redundancy control of RFCs in a base station of a CDMA system, which is completed and reported to a BCP. The method of claim 1, wherein the data processing process, Performing a redundant RFC and, upon power-on, disabling the address searching mode of channel A, initializing the SCC to prevent transmission (Tx) by disabling transmission request signal (RTS); Receiving all data packets (Packet) sent to the RFC in the step of selecting and storing only the configuration data of RFCs of the same sector as the HDLC address of the packet from among these packets and provide them to the interrupt handler Redundancy control method of RFC in base station of CDMA system.