KR100295438B1 - The method of automatic restoring network fault in pcs - Google Patents

Abstract

PURPOSE: A method for automatically recovering a network fault in a personal communication system is provided to automatically recover a network fault in case that the fault is generated from a trunk line between a base station and a base station controller. CONSTITUTION: In case that a BHIPA cannot perform a transmission, an LHIPA transmits a keep-alive signal to the BHIPA. In case that there is no answer from the BHIPA, it is judged as a fault of a link transmission in a BCIN. The LHIPA transmits a link reset signal determined. In case that the BHIPA receives the link reset signal from the LHIPA, a link between the BCIN and the LIEA(Link Interface IPC E1 Assembly) is reset. The keep-alive signal received from the LHIPA to the BHIPA is estimated. In case that there is no signal from the LHIPA for a fixed time, it is judged as a fault of a link node. A link between the BCIN and the LIEA is reset.

Description

How to automatically recover from network failures in personal mobile communication systems {THE METHOD OF AUTOMATIC RESTORING NETWORK FAULT IN PCS}

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for automatically recovering from a network failure in a personal mobile communication system, and in particular, between a base station controller (BSC) and a base transceiver subsystem (BTS) in a personal communication service (PCS) system. The present invention relates to a software complementary method according to an automatic recovery method when a link node fault occurs.

In general, in a current code division multiple access (CDMA) system, a base station and a base station controller are connected by a relay line through a link interface IPC E1 Assembly (LIEA). The base station and base station controllers are responsible for the operation and status management of the boards responsible for the Inter Processor Communication (IPC) node (HINA) and the trunk line board (LIEA) that each processor connects. There is a board (High capacity IPC Processor Assembly (HIPA). Alarms generated in the trunk line are classified into RA (Remote Alarm), LOS (Los Of Of Signal), OOF (Out Of Frame), AIS (Rcv All '1' Signal), CRC (Cyclic Redundancy Check) and reported to HIPA. This is solely for detecting the hardware level of the trunk line board. At this time, HIPA board and LIEA board communicate through Dual Port RAM (DPRAM) existing in LIEA board, and relay line alarm or fault status is based on information sent from LIEA board. Call Control Processor (CCP), Base Station Manager (BSM), etc. are configured to be reported.

This conventional configuration causes a problem that the relay line board itself does not detect a problem, and thus does not automatically recover when a case in which the actual interprocessor communication is not performed occurs. As an example of this, if a particular channel of the LIEA board falls into the backloop mode, if it falls into the deadlock due to external factors, it is recorded in the DPRAM area that should not be recorded due to unknown reasons. There may be a case in which normal communication with HIPA is not possible, and for this reason, a problem arises in that actual interprocessor communication (IPC) does not work.

This is an abnormal operation only in a specific memory area of the trunk line board. Therefore, it is not recovered from the trunk line board, and therefore needs to be supplemented by a processor that manages the higher state.

Accordingly, an object of the present invention is to provide a method for automatically recovering when a relay line failure between a base station and a base station control station occurs.

Figure 1 (a) is a flow chart according to the automatic network failure recovery when not transmitted in BHIPA.

Figure 1 (b) is a flow chart according to automatic network failure recovery when not received in BHIPA.

In order to achieve the above object, a method for automatically recovering from a network failure in a personal mobile communication system according to the present invention includes: transmitting a keep-alive signal from the LHIPA to the BHIPA when the BHIPA cannot be transmitted; If there is no response from the BHIPA, determining that the BCIN is a link transmission failure; LHIPA sends a signal (link reset signal) promised to BHIPA; And resetting a link of LIEA of BCIN when BHIPA receives the link reset signal from LHIPA.

The process of sending a keep-alive signal from LHIPA to BHIPA may include: sending one signal every 2.5 seconds and updating a status according to a response; Checking the managed state after 9 seconds and reporting the state change to the upper processor if there is a change; And if there is at least one normal response for 9 seconds, determining that the status is normal and managing the status.

Determining that the lower processor is down preferably corresponds to a case where there is no response for at least 9 seconds.

In addition, the method for automatically recovering from a network failure in a personal mobile communication system according to the present invention may include: counting a keep-alive signal received from LHIPA in BHIPA if it is not received by BHIPA; Determining that there is a reception failure of the link node when there is no signal from the LHIPA for a predetermined time; And resetting a link of LIEA of BCIN.

If the reception is not received in the BHIPA, it is preferable to allow a time determined to be sufficient in consideration of the time to send the keep-alive signal so that the ping-pong phenomenon does not occur in association with the transmission.

In the process of resetting the link of the LIEA of the BCIN, the BHIPA preferably communicates with the LIEA and the DPRAM in the LIEA board and issues a link board initialization command.

It is preferable to perform the link board reset only at the base station.

According to the present invention, in the state where HIPA, a maintenance processor of a communication interconnection network (hereinafter referred to as CIN), operates normally, the relay board LIEA fails and cannot be automatically recovered at the hardware level. If it is missing, it is configured to operate normally.

In the current personal mobile communication system, due to unknown causes of the relay board, a specific channel that operates is recorded in DPRAM in an area that should not be set or written to the loopback mode, which causes abnormal operation. In this case, the automatic recovery is not possible and may fall into an abnormal state for a long time.

The trunk line board appears to be in normal operation and is normal except for certain areas, so there is no defined alarm in the relay line board, but packet communication with the external base station is not possible.

Therefore, the present invention provides a method for controlling the case where the communication with the upper CIN is not made in HIPA, which is a processor that manages the CIN node and the relay line state and reports to the upper processor.

According to the present invention, a keep-alive signal is periodically sent to check whether communication between the upper CIN (LHIPA) and the CIN (BHIPA) is performed, and the lower CIN is divided into a transmission failure and a reception failure. Allows you to issue a Link Reset command.

This is a software complementary method because of the difficulty in recovery when a failure occurs in the link board of a base station installed at a remote location in operation.

The HIPA management software hipax block can be recovered only in two cases, when the transmission is not made at the base station HIPA (BHIPA) or when the reception is not received at the HIPA (BHIPA).

If the BHIPA cannot transmit, the upper LHIPA determines BHIPA as a Dual Down. The BHIPA determines that the BHIPA is Dual Down. The BHIPA transmits a Link Board Reset Signal.

If the BHIPA is not received, the BHIPA counts the signals coming from the LHIPA by itself and determines if the BHIPA does not receive a signal for a predetermined time. This should be considered well in relation to the time to send the keep-alive signal so that the pingpong phenomenon does not occur in connection with the case where the BHIPA cannot transmit.

-Link board reset is performed only at the base station and is commanded using DPRAM communication between HIPA and LHEA.

Hereinafter, the operation principle of the present invention with reference to the accompanying drawings in detail as follows.

FIG. 1A shows a flow chart of a case where BHIPA cannot be transmitted in a personal mobile communication system.

LHIPA sends a keep-alive signal from BHIPA.

One signal is sent every 2.5 seconds and status is updated accordingly.

After 9 seconds, it checks the managed state and, if there is a change, reports the state change to the upper processor.

If there is at least one normal response for 9 seconds, it is determined to be normal and state management is performed.

If there is no response for 9 seconds, it is determined that the lower processor is down. That is, the case where the lower processor is determined to be down corresponds to a case where there is no response for at least 9 seconds.

Since there is no response from BHIPA, BCIN determines that the link transmission has failed.

LHIPA sends a signal (link reset signal) promised to BHIPA.

When BHIPA receives the link reset signal from LHIPA, it resets the link of LIEA of BCIN.

At this time, BHIPA communicates with DPEA in LIEA and LIEA board and issues link board initialization command through it.

FIG. 1B illustrates a case in which BHIPA cannot be received in a personal mobile communication system.

BHIPA counts the keep-alive signals received from LHIPA.

If there is no signal from LHIPA for a certain period of time, it is determined as a reception failure of the link node.

In this case, in order to prevent the ping-pong phenomenon from occurring in connection with the case where the transmission is not allowed, a time determined to be sufficient is considered in consideration of the time for sending the keep-alive signal.

Reset the link in BCEA LIEA.

The present invention operating as described above is a software complementary method for the case where the IPC between the base station and the base station controller due to the base station relay line failure. This is forcibly requiring initialization of the link in the application software of the upper processor in a situation where the relay line hardware does not recover itself, and has the effect of hardware reset and the link is initialized.

Claims (7)

If you can't send from BHIPA, Sending a keep-alive signal from LHIPA to BHIPA; If there is no response from the BHIPA, determining that the BCIN is a link transmission failure; LHIPA sends a signal (link reset signal) promised to BHIPA; And When BHIPA receives the link reset signal from LHIPA, resetting the link of LIEA of BCIN. The method of claim 1, wherein the sending of the keep-alive signal from the LHIPA to the BHIPA includes: Sending one signal every 2.5 seconds and updating the status according to the response; Checking the managed state after 9 seconds and reporting the state change to the upper processor if there is a change; And Method for automatically recovering from a network failure in a personal mobile communication system comprising determining that the status is normal and managing status if there is at least one normal response for 9 seconds. The method of claim 2, further comprising determining that the lower processor is down when there is no response for 9 seconds. If you don't receive at BHIPA, Counting on a keep-alive signal received from LHIPA at BHIPA; Determining that there is a reception failure of the link node when there is no signal from the LHIPA for a predetermined time; And A method for automatically recovering from a network failure in a personal mobile communication system, comprising resetting a link of a BCEA LIEA link. 5. The system of claim 4, wherein time is determined to be sufficient in consideration of the time for sending a keep-alive signal so that the ping-pong phenomenon does not occur in connection with the case where the transmission of claim 1 is not performed. Recovery method. The network failure autonomous system of claim 4, wherein in the process of resetting the link of the LIEA of the BCIN, the BHIPA communicates using the DPRAM in the LIEA and the LIEA board and issues a link board initialization command through the DPRAM. Recovery method. 7. The method of claim 6, wherein the link board reset is performed only at the base station.

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