KR20040054834A - Remote control apparatus and methods of bts in mobile communication system - Google Patents

Abstract

PURPOSE: An apparatus and a method for remotely controlling a base station system in a mobile communication system are provided to remotely reset remote units. CONSTITUTION: A main unit(110) monitors a state of transmission and reception between the main unit(110) with remote units(120). If reset is required, the main unit(110) inserts preliminarily set pattern information into a payload in a predetermined period through a pattern generator(113). The main unit(110) includes a main unit framer(112) combining the payload with overheads inputted from a main central processing unit(111). The remote unit(120) compares the pattern information inserted into the payload with preliminarily set reset pattern in a predetermined period to detect the pattern information and generate a reset signal to a sub-central processing unit(121).

Description

Remote control device and method of base station system in mobile communication system {REMOTE CONTROL APPARATUS AND METHODS OF BTS IN MOBILE COMMUNICATION SYSTEM}

The present invention relates to an apparatus and method for controlling a base station system of a mobile communication system, and more particularly, to an apparatus and method for remotely controlling a remote station connected to a central station of a base station system by a ray.

In general, the base stations of the mobile communication system may have different service areas and transmit powers that can communicate with mobile terminals according to frequency characteristics.

If there is an obstacle in such a service area, the shaded area is difficult to reach in the service area, so that the subscribers in the shaded area have difficulty in receiving quality service. In urban areas, for example, the reflectance is increased by buildings and other features. As a result, shadowed areas are generated between buildings, which makes it difficult for mobile terminals located therein to communicate with base stations. To this end, base stations increase transmission power in order to attempt communication with a mobile station. In addition, the service area is widened in the area where the subscribers are small. In order to communicate with the mobile station in the wide service area, the transmission power must be increased.

However, if the transmission power is continuously increased until communication with the mobile terminal in the shaded area is performed, the base stations exceed the limit of the capacity to process, thereby causing damage to equipment in the base station or interference between the base stations.

Therefore, the base station is separated into a central station and a remote station so that the base station can communicate with the mobile terminals without increasing the transmission power in the shadow area and the wider service area. And remote stations can be divided into many, depending on the shaded area. The configuration of such a base station will be described with reference to the drawings.

1 is a block diagram showing a base station system for remotely controlling a reset operation of a conventional remote station.

The base station system is composed of a central station 10 (Main unit) and a remote station 20 (Remote unit) remotely controlled from the central station 10 connected by optical paths.

The central station 10 has a central station controller that performs an overall control function and a central station framer 12 that generates a synchronous transport module (STM-n) signal.

The remote station 20 receives a remote station framer 22 for separating reset information included in a signal received from the central station framer 12, and a sub-central processing unit that receives the separated reset information signal and performs reset. Has 21.

The main CPU 11 monitors each component to collect alarm state, performance state, and operation state information and take action accordingly. And it transmits a predetermined operation maintenance information so that the other party can grasp such alarm state, performance state and operation state. Here, the operation maintenance information is transmitted and received through the data communication channel (DCC).

The central station framer 12 receives a synchronous transport module signal (STM-n) via a predetermined path 30 according to a synchronous digital channel (SDH) received from a channel device (not shown). )

The process of controlling the remote station from the existing small capacity base station configured as described above to the main central processing unit of the central station will be described.

The main central processing unit 11 transmits operation maintenance information through a high-level data link control (HDLC) (hereinafter referred to as HDLC) at 55.5 Mbps Pesudo Emitter Coupled Logic (PECL) (hereinafter referred to as PECL). Is transmitted to the central station framer 112 through a data communication channel (DCC). At this time, the optical signal is transmitted through an optical signal transmission unit (OTSM: Optical Transceiver Sub-Moudule). Here, the reset information (pattern information) is included in the operation maintenance information, and the PECL may be directly connected to the remote station 20. HDLC is a transport protocol used in the data link layer, which is the second layer.

The operation maintenance information transmitted from the central station 10 is then extracted at the remote station framer 22 via the second data communication channel DCC2. Then, the extracted information is sent to the processor through HDLC communication and then delivered to the corresponding module, that is, the sub CPU 21. The state information of the module inside the remote station 20 collected by the remote station 20 is transmitted to the multiplexing device through HDLC communication from a processor (not shown) in the reverse order of the control command. Then, the state information is transmitted to the central station 10 through the second data communication channel DCC2. As a result, the main CPU 11 may remotely control the sub CPU 12 of the remote unit 20.

In the above-described remote control method, the system operates normally when the central station and the remote station operate normally without a problem.

However, if the sub central processing unit of one of the remote stations is unstable, the system cannot operate normally when the information transfer between the central station and the remote station is abnormal or there is no response. In addition, if the sub central processing unit is normal but there is an error in the path (data communication channel (DCC)) or if a slight error checking (CRC: Cyclic Redundancy Checking) error occurs in the synchronous transport module relay line, the remote station is remotely controlled. You will not be able to. To solve this problem, the base station must be reset directly. However, when directly resetting a central station transmitting and receiving with a plurality of remote stations, other remote stations are affected. Therefore, a remote station having a problem must be reset directly.

However, the remote station has a problem in that it is difficult to initialize the base station system because the operator can not always reside, or is installed in a location that is difficult to access or remote.

Accordingly, an object of the present invention is to provide an apparatus and method for remotely controlling transmission and reception between a central station and a remote station.

Another object of the present invention is to provide a control apparatus and method for remotely resetting a remote station from a central station when a problem occurs during transmission and reception between the central station and the remote station.

An apparatus for achieving the object of the present invention is a mobile communication system comprising a base station system having at least one remote station connected to the central station in the optical path, the apparatus for remotely controlling the transmission and reception between the central station and the remote station, When the transmission and reception status with the remote station is monitored and reset is required, the central station repeatedly inserts preset pattern information into the payload and transmits the pattern information inserted into the payload to the remote station. And a remote station that generates a reset signal after detecting the pattern information by comparing the preset reset pattern repeatedly for each period.

A method for achieving the object of the present invention comprises a base station system having a central station having a pattern insertion unit and a base station system having at least one remote station optically connected to the central station and having a pattern insertion unit. A method of remotely controlling transmission and reception between a remote station and a remote station, the method comprising: monitoring a transmission / reception state with the remote station and repeatedly inserting preset pattern information into a payload of a frame every predetermined period when a reset is necessary; Transmitting a frame combining load and overhead to the remote station, separating the payload and overheads from the frame received from the central station, pattern information in the separated payload and a preset reset Detecting the pattern information by repeatedly comparing the patterns at regular intervals; And generating a reset signal when the detected pattern information is detected a predetermined number of times.

1 is a block diagram showing a base station system for remotely controlling the reset of a conventional remote station;

2 is a block diagram illustrating a base station system for remotely controlling the reset of a remote station according to an embodiment of the present invention;

3 is a block diagram showing a frame structure of a synchronous transport module applied to a base station system according to an embodiment of the present invention;

4A is a flowchart illustrating a process of generating a pattern in a central station according to an embodiment of the present invention;

4B is a flowchart illustrating a process of detecting a pattern at a remote station according to an embodiment of the present invention.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings. First of all, in adding reference numerals to the components of each drawing, it should be noted that the same reference numerals have the same reference numerals as much as possible even if displayed on different drawings.

In addition, in the following description, many specific details such as specific signals and signal levels are shown, which are provided to help a more general understanding of the present invention, and the present invention may be practiced without these specific details. It is self-evident to those of ordinary knowledge in Esau. In the following description of the present invention, if it is determined that a detailed description of a related known function or configuration may unnecessarily obscure the subject matter of the present invention, the detailed description thereof will be omitted.

Hereinafter, a configuration of a base station system for resetting and controlling a remote station through a separate path according to an embodiment of the present invention will be described with reference to the drawings.

2 is a block diagram illustrating a base station system for remotely controlling a reset operation of a remote station according to an embodiment of the present invention.

The base station system according to an embodiment of the present invention is composed of a central station 110 and a remote station 120 remotely controlled from a central station 110 connected by a light path.

The central station 110 inserts a pattern into the payload of the synchronous transport module (STM-n) frame according to the command of the main central processing unit 111 and the main central processing unit 111 to control the overall operation. It has a pattern generating section 113. The central station framer 112 combines the payload into which the pattern information for resetting is inserted, and the overheads input from the main CPU, and transmits the combined frame to the remote station 120.

The remote station 120 has a remote station primer 122 that separates payloads from frames received from the central station 110, and a pattern detection unit 123 that detects pattern information in the separated payloads. The remote station 120 has a reset signal generator 124 for generating a reset signal according to whether the detected pattern information matches a preset counter value, and a sub central processing unit 121 for controlling the reset signal. have.

The main central processing unit 111 monitors the occurrence of an abnormality of the sub central processing unit 121 to be described later, and sends a pattern generation command signal to the pattern insertion unit 113 to reset the power of the remote station 120 when the abnormality occurs. send.

The pattern insertion unit 113 continuously inserts pattern information for reset in a frame for a predetermined time, for example, for 625 ms according to the pattern generation command of the main CPU 111, and repeatedly inserts pattern information for each of the cycles. do. Here, the reset pattern information is preset information, and the same information is preset in the sub-central processing unit 121 to be described later in order to compare whether the pattern information is correct information when detected by the remote station 120.

The remote station framer 122 separates the frame and transmits the payload to the pattern detection unit 123 through the payload path 140, and passes the overheads through the overhead path 130 to the sub central processing unit 121. To send. The overhead path 130 and the payload path 140 are shown in phantom in FIG. 2.

The pattern detector 123 compares the pattern information in the payload received from the remote station primer 122 with the preset reset information before detecting the pattern information, and detects the pattern information when the pattern information is matched. The pattern detector 123 continuously detects the pattern information for a predetermined time, and repeatedly detects the pattern information for each predetermined time. In this case, the predetermined time is set to a predetermined time, for example, 625 ms, during which the pattern generator 113 inserts the pattern.

The central station framer and remote station framer of the base station system form a synchronous transport module frame structure. Such a synchronous transport module frame structure is applied to a control method for resetting a remote station of a base station according to an embodiment of the present invention. Before explaining this, the synchronous transport module frame structure will be described with reference to the drawings.

3 is a block diagram illustrating a synchronous transport module frame structure applied to a base station system according to an embodiment of the present invention.

The synchronous transport module frame 200 has a repeater section overhead 210 and a multiplexer section overhead 220. And a payload 240 with path overhead 230 applied to the path hierarchy and overheads for the lower path. In this case, the section overheads are overheads inserted and extracted from the player or multiplexer section for the purpose of indicating transmission performance of the synchronous transport module signal, operation and maintenance, and the like. In addition, the relay section overhead 210 and the multiplexing section overhead 220 are positioned at the top and the bottom with the AU-4 (AU-4) pointer 250 in the middle.

The relay section overhead 210 is an overhead used for the end device and the relay period transmission reliability when there is a repeater performing a relay function between the end device and the end device. This is bytes 1 to 9 of each row 1 to 3 of the synchronous transport module frame 200. The repeater section overhead 210 has a first data communication channel (DCC1) 211 that can be used in the repeater section. This is used to transmit a time stamp (TIME STAMP) informing the remote station 120 that it is 8k synchronized with 80ms.

The multiplexing section overhead 220 is an overhead used to secure transmission reliability between end devices except for relay devices. It uses bytes 1 through 9 of rows 5 through 9 of the synchronous transport module frame 200, and has a performance monitoring byte, a second data communication channel 221, and a power information monitoring byte. This is used to control the remote station 120.

The path overhead 230 is a channel-by-channel performance monitoring and a channel-by-channel to confirm continuity of connection until the synchronous digital hierarchy (SDH) signal is synchronized to the synchronous transport module (STM-n) signal and then multiplexed for each channel. It has the power monitoring byte.

The payload 240 contains substantial traffic information and pattern information for resetting inserted for a certain period when an abnormality occurs.

A control method for remotely resetting a remote station according to an embodiment of the present invention using such a synchronous transport module (STM-n) frame will be described with reference to the drawings.

4A is a flowchart illustrating a process of generating a pattern in a central station according to an embodiment of the present invention, and FIG. 4B is a flowchart illustrating a process of detecting a pattern in a remote station according to an embodiment of the present invention.

The main central processing unit 111 of the central station 110 checks whether the remote station 120 operates abnormally. That is, it is checked whether normal communication is performed through the second data communication channel 221. At this time, if communication is not normally performed, the main control device 111 sends a pattern insertion command for resetting the remote station 120 to the pattern insertion unit 113 without using the second data communication channel 121. It becomes.

Then, as shown in FIG. 4A, the pattern insertion unit 113 checks whether the pattern insertion command of the main CPU 111 is received in step 300, and receives the pattern insertion unit 113 in step 310 for a predetermined time, for example, for 625 ms. The pattern information for resetting is continuously inserted into the payload 240, and then the pattern information inserted into the payload 240 is sent to the central station framer 112 in operation 350. On the other hand, if not, the flow returns to step 300 to perform the acknowledgment process again. That is, pattern information insertion for resetting is repeatedly performed for each predetermined time.

The central station framer 112 then combines the payload 240 into which the pattern information is inserted and the overheads 210, 220, 230 of the synchronous transport module frame 200 input from the main central processing unit 111. To transmit the combined frame to the remote station 120. In this case, the frame signal is converted into an optical signal by a photoelectric conversion unit (not shown) and transmitted.

Then, in step 330, it is checked whether the insertion of the reset pattern information is completed, and if it is not completed, step 300 is repeated. On the other hand, when it is completed, the insertion of the pattern information is stopped in step 340. In this case, when the remote station 120 operates normally due to the remote reset, it is possible to know that the central station 10 operates normally through the second data communication channel 121. Will stop.

Remote station 120, on the other hand, separates the frame received from central station 110 into overheads and payload. The remote station primer 122 then sends the overheads 210, 220, 230 to the sub central processing unit 121 via the overhead path 130, and sends the payload 240 to the pattern detector 123. To the payload path 140.

Then, as shown in FIG. 4B, the pattern detector 123 monitors pattern information for resetting inserted into the 400 payload 240. Thereafter, in step 410, when the same pattern information is inserted, the pattern information is compared with the preset reset information for a predetermined time, and the counter is incremented in step 420. On the other hand, if another pattern is inserted for a certain period, the counter is initialized in step 415 to repeat step 400.

After incrementing the counter, in step 430, the controller checks whether the current counter value matches the preset counter value, and if it does not match, repeats step 400 based on a predetermined time. On the other hand, if there is a match, the counter is initialized in step 435 and the reset pattern information is transmitted to the reset signal generator 124 in step 440.

Then, the reset signal generator 124 receives the pattern information and transmits the reset signal to the sub CPU 121. At this time, the sub central processing unit 121 receiving the reset signal resets the remote station by controlling the reset signal.

Meanwhile, in the detailed description of the present invention, specific embodiments have been described, but various modifications are possible without departing from the scope of the present invention. Therefore, the scope of the present invention should not be limited to the described embodiments, but should be defined not only by the scope of the following claims, but also by the equivalents of the claims.

As described above, the present invention inserts the pattern information into the payload from the central station, transmits the pattern information to the remote station, and resets the remote station remotely since a reset signal is generated to the sub-central processing unit as the pattern information transmitted from the remote station is detected. It can work.

Claims (7)

Claims [1] A mobile communication system comprising a base station system having at least one remote station connected to a central station by a light beam, the apparatus for remotely controlling transmission and reception between the central station and the remote station, A central station that monitors the transmission / reception status with the remote station and, when reset is required, inserts preset pattern information into the payload repeatedly at predetermined periods and transmits the same to the remote station; And a remote station that detects the pattern information by repeating the pattern information inserted into the payload for each predetermined period and detects the pattern information and generates a reset signal. The method of claim 2, And the remote station resets a count value if the pattern information is not detected. The method of claim 1, wherein the central station, A main central processing unit that monitors a transmission and reception state with the remote station, A pattern insertion unit for repeatedly inserting preset pattern information into a payload at predetermined intervals according to a pattern generation command of the main CPU; And a central station framer for transmitting the frame combining the payload and the overheads to the remote station. The method of claim 1, wherein the remote station is A remote station primer for separating overheads and payload in the frame received from the central station; A pattern detector which detects the pattern information when comparing the pattern information inserted into the payload with a preset reset pattern; A reset signal generator for generating a reset signal when the pattern information is detected a predetermined number of times; And a sub central processing unit for receiving the overheads separated in the remote station primer and resetting in accordance with the reset signal. A mobile communication system comprising a base station system having a pattern insertion unit and a base station system optically connected to the central station and having at least one remote station, the method of remotely controlling transmission and reception between the central station and the remote station, Monitoring the transmission / reception status with the remote station in the central station and repeatedly inserting preset pattern information into a payload of a frame every predetermined period when a reset is necessary; Transmitting a frame combining the payload and the overheads to the remote station; Separating the payload and overheads in the frame received from the central station; Comparing the pattern information in the separated payload with a preset reset pattern to detect the pattern information; And generating a reset signal when the detected pattern information is detected a predetermined number of times. The method of claim 5, wherein the detecting of the pattern information comprises: Incrementing a count value when the detected pattern information and the preset reset pattern are the same; Initializing a count value when the count value is equal to a preset count value; And comparing the detected pattern information with the next detected value if the count value is not equal to a preset count value. The method of claim 5, wherein the detecting of the pattern information comprises: And initializing a count value when the detected pattern information and the preset reset pattern are different, and comparing the detected pattern information with the next detected pattern information.