KR100253798B1 - Control method of transmission controler in high speed paging system - Google Patents

Abstract

PURPOSE: A method for controlling transmitter by a high-speed site controller module in a high speed paging system is provided to enable a call data of PLEX protocol to be transmitted and to present a rule for a hardware level by modifying a conventional hardware to RS 422 level. CONSTITUTION: In a paging system comprising a high-speed site controller module, numbers of main transmitters in operating and a reserved transmitter in standby, a parallel interface sends a data to a transmitter by using a data bit which is comprised of MS(Most Significant) bit and LS(Least Significant) bit using a reference clock synchronized to the absolute time by GPS(Global Positioning System). Using a message format comprising an STX(Start of Text) field representative of the start of a message, an FSN(Frame Sequence Number) field representative of whether the frame being transmitted is a new frame or a re-transmitted frame, an REP field representative of the number of times of a frame re-transmitting, a reserved REV field, an R_S(Return_State) field representative of the result for a request message in the form of bit map, an NBC field representative of the number of character in a data field, a data field for a serial message exchanging, a BBC field as an error check sum for fields from SSX to DATA field, an ETX(End of Text) field representative of the end of message, a serial interface controls the transmitter.

Description

Transmitter Control Method for Paging System

The present invention relates to a transmitter control method for a paging system, and more particularly, to a transmitter interworking protocol required for a fast paging system supporting a fast paging protocol.

A paging system is a system that provides various pager services to a pager wirelessly. The paging system receives call data from a paging terminal for calling a base station for each cell, which is an allocated area. The radio page signal is sent to the pager of the area.

Each base station must simultaneously transmit call data for a radio call signal, in order to prevent a pager terminal existing in an overlapping area of a base station cell area from receiving the same paging call multiple times.

A typical paging system may be divided into a terminal portion that generates a hodata based on information received from a subscriber, and a base station portion that receives the hodata from a terminal and emits radio frequency to a corresponding pager.

Here, the base station part is a transmitter controller which receives the hodata from the terminal, combines it according to the protocol in use, and sends the hodata to the transmitter in synchronization with the absolute time information (reference clock signal) received from the GPS receiver for simultaneous transmission of the hodata. High-speed Site Controller Module (HSCM) portion; The signal may be divided into a transmitter (TX) part that receives the data from the HSCM, modulates the radio frequency, and then emits the signal to the corresponding pager.

At this time, the transmitter for transmitting the call signal to the pager loads the signal received from the paging terminal on a high frequency carrier with low noise. This process is called modulation.

When modulation is performed on a signal frequency in the range of -8 to 8KHz using a carrier of 300KHz, the actually transmitted modulated signal is a signal in the range of 292KHz to 308KHz.

In the conventional paging system, the interface between the HSCM and the transmitter is made at the RS-232C level, and the call data (Page Data) is transmitted to the transmitter as serial data by using the Post Office Code Standardization Advisory Group (POCSAG) protocol format. .

Digital data using the Post Office Code Standardization Advisory Group (POCSAG) method uses digital two-level data of frequency shift keying (FSK), which shifts the center frequency with respect to binary code by a constant frequency shift. do.

For example, FSK digital two-level data is shifted by -frequency shift at the center frequency for bit 0, and shifted by + frequency shift at center frequency for bit 1.

The transmitter modulates the received data with a frequency deviation of 4800 Hz and -4800 Hz and transmits the data to each terminal through a frequency shift method or a GPS (Global Positioning System) launch method.

In the case of transmitter control messages sent from HSCM, messages are classified and exchanged according to the rules (protocols) that have been assigned with specific patterns at the beginning and end of the message.

Recently, as subscribers increase exponentially, the need for larger channel capacity is increasing due to congestion of limited channels, which is a synchronous paging protocol instead of POCSAG, which is an asynchronous paging protocol supporting up to 2400bps. FLEX has been developed.

In the synchronous paging system, only the system time error within a few seconds is allowed. Therefore, in order to achieve such precise time synchronization, a method of acquiring time synchronization through satellites is widely used.

The time synchronization of a mobile communication system is most commonly obtained using a GPS receiver. Each control station and base station receive a 1 PPS, 10 MHz signal, etc. as a synchronization signal using a GPS receiver, and all stations transmit the hodata according to this synchronization signal.

To this end, a GPS receiver is provided for each control station and base station to obtain a reference time of the system. The GPS receiver calculates the exact hour, minute, and second from the sync signal received from the satellite so that the hodata can be sent.

In the FLEX protocol, each address for a terminal specifies a reference frame within 128 frames that appear on the channel every four minutes, so that the terminal receives a signal only at the time it appears. .

The 1600bps FLEX system sends messages at frame 0, cycle 0 at GPS time on an hourly basis. Each cycle is sent 15 times an hour, each cycle consisting of 128 frames. Each frame is sent out at intervals of 1.875 seconds.

The FLEX protocol operated as described above may support all cases, such as 1600, 3200, 6400bps, which is faster than the conventional 512, 1200bps.

For example, when operating at 6400bps, it can support up to five times the call volume of 1200bps POCSAG channel.

In addition to the existing two-level signal can be processed more than four levels. When using FSK four-level digital data, the frequency shifts that are typically used are + 4.8KHz, + 1.6KHz, -1.6KHz, and -4.8KHz at each level.

In addition, unlike the existing system, the call data must support RS 422 level, and must be transmitted to the transmitter by dividing the MS (Most Significant) bit and the LS (Least Significant) bit by gray code.

However, in case of the transmitter control message as described above, the contents of the transmitter control message are not standardized. Therefore, the transmitter control message cannot be used when the transmitter control message is linked with other transmitters, that is, the FLEX protocol.

Therefore, in order to solve the problems as described above,

Basically, by modifying the conventional hardware that cannot support the FLEX protocol to the RS 422 level, the call data transmission of the FLEX protocol is supported, and the purpose of the hardware level provision is presented.

In addition, in case of serial interface, the contents and interface method of each message are newly defined to prepare for future expansion and HSCM supports a more efficient way to control the transmitter. Its purpose is to enable it to be used.

1 is a block diagram of a transmitter controller and a transmitter

Fig. 2 is a timing diagram showing an example of character transfer by the serial interface of the present invention.

3 is a message format by the serial interface of the present invention.

4 is a timing diagram showing signals by the parallel interface of the present invention.

5 is a structure of a data field by serial message exchange of the present invention.

6 is a configuration table showing all the alarms of the present invention.

7 is a value field of an SD message required by the HSCM according to the present invention.

8 is a message flow diagram illustrating message retransmission according to the present invention.

9 is a message flow diagram illustrating a process of initializing a transmitter using a serial message according to the present invention.

10 is a message flow diagram illustrating operation of a transmitter in accordance with the present invention.

11 is a message flow diagram illustrating a primary / preliminary transfer procedure of a transmitter.

12 is a message flow diagram illustrating a primary / preliminary recovery procedure of a transmitter.

Figure 13 is an illustration showing a mixed method of FLEX and POCSAG according to the present invention.

14 is a message flow diagram showing a mixing process of FLEX and POCSAG according to the present invention.

15 is a message flow diagram illustrating a method for operating a POCSAG multichannel according to the present invention.

16 is a message flow diagram illustrating a transmitter software download method in accordance with the present invention.

The present invention was created to achieve the above object,

A paging system comprising several primary transmitters in standby and a standby standby transmitter in HSCM,

A parallel interface for transmitting data to a transmitter using data bits consisting of MS bits and LS bits using a reference clock synchronized in absolute time by a GPS receiver; Bit of the STX field indicating the beginning of the message, the FSN field indicating whether the current frame is a new frame or a retransmission frame, the REP field indicating the number of repeated frame transmissions, the reserved REV field, and the result of processing the request message. An R_S field in map form, an NBC field indicating the number of characters in the data field, a data field for serial message exchange, a BCC field that is an error checksum for the STX to DATA fields, and an ETX field indicating the end of the message Characterized in that the link level interface configured as a serial interface for controlling the transmitter using a message format configured to include a.

The operation of the transmitter constituting the paging system is performed by the HSCM, and the transmitter is divided into a main transmitter (Active TX) and a spare transmitter (Standby TX).

1 is a block diagram showing the structure of a transmitter controller and a transmitter.

As shown, the main transmitter and the preliminary transmitter receive data from a transmitter controller (HSCM) and transmit the data through the corresponding transmit antenna under the control of the transmitter controller.

The present invention relates to an interface for transmitting and receiving parallel data and serial messages between the HSCM and a transmitter.

In the SEC-I20 interface standard according to the present invention, all signals between the HSCM and the transmitter are configured by applying the CCITT V.11 (EIA RS 422) signaling method, and are largely defined as a parallel interface and a serial interface.

The parallel interface defines a data bit consisting of MS bits and LS bits by using a clock synchronized in absolute time by a GPS receiver, and can transmit FLEX data to a transmitter.

Therefore, high speed paging systems can support all protocols from POCSAG 512 to FLEX 6400.

The serial interface defines a serial communication method that can control a transmitter. Through the provisions promised in this serial message exchange method, the HSCM controls the transmitter.

In the future, it will be possible to extend the functionality by adding only messages for serial message exchange.

In the case of a parallel interface, the hardware is designed at the RS 422 level, and the data bits consisting of MS bits and LS bits are sent to the transmitter by being written to the FIFO (First Input First Output) continuously in synchronization with the Baud Clock, which is sent to the transmitter. And POCSAG protocol.

In the case of a serial interface, different types of messages are supported by the prescribed message format. Serial message exchange is achieved by the transmitter responding with a reply message to the request message of the HSCM.

In addition, each message has a defined time constraint, and if there is no response within this time, the message is retried up to two times.

When the transmitter sends a response message, the transmitter records the result of the processing in the R_S field (Return_Status Field) and reports the result to the HSCM, which the HSCM performs processing with reference to.

The interface method between the high speed HSCM module (HSCM) and the transmitter (TX) according to the present invention with reference to the attached SEC-I20 interface specification in detail as follows.

The interface method between the HSCM and the transmitter according to the present invention is based on the ERMES BSC-transmitter interface I20.

The HSCM according to the present invention uses a 4 × 6 metal connector and the transmitter uses a 15-pin D-connector (ISO 4903).

Description of each transmitter connector 15 pin is shown in Table 1.

pin name Direction HSCM-Transmitter Explanation One E (A) ＞ Transmitter reset 2 T (A) < Serial Data to HSCM 3 C (A) ＞ Transmitter On / Off 4 R (A) ＞ Serial data from HSCM 5 I (A) ＞ LS bit 6 S (A) ＞ Reference clock 7 B (A) ＞ MS bit 8 G ＞ < Ground (signal ground) 9 T (B) < Serial Data to HSCM 10 C (B) ＞ Transmitter On / Off 11 R (B) ＞ Serial data from HSCM 12 I (B) ＞ LS bit 13 S (B) ＞ Reference clock 14 B (B) ＞ MS bit 15 E (B) ＞ Transmitter reset

Each pin is T (), R (), B (), S () V _A To V _B It is '0' when <0.3V, and for C () V _A To V _B It is 'on' when <0.3V, and in case of E (), it is active low by a pulse of 100msec.

The serial interface specification according to the present invention is as follows.

Characters by the serial interface are composed of 8-bit strings, and binary codes are transmitted from the LSB. The character has 7 bits of data and one bit of even parity bit.

Fig. 2 is a timing diagram showing an example of character transmission by the serial interface of the present invention.

As shown, an example of transmission of the ASCII character 'V' is shown.

Figure 3 shows the message format by the serial interface of the present invention.

As shown, an STX (Start of Text) field; A frame sequence number (FSN) field; A REP field; A REV (reserved) field; An R_S field; An NBC field; A data field; A BCC field; It is configured to include an End of TeXt (ETX) field.

The STX field has an ASCII value 'Start of Text' = [0x02] and indicates the beginning of a message.

The FSN field is a frame unique number used to determine whether a transmitted frame is a new frame or a retransmitted frame. The FSN has a value from ASCII '0' = [0x30] to '9' = [0x39], and repeats with '0' after '9'. The FSN fields of the receiving side and the transmitting side shall be identical.

The REP field indicates the number of repeated frame transmissions, and has a value ranging from ASCII '0' to '1', allowing up to two frame retransmissions. The transmitter does not use the REP field.

The REV field is a reserved field and is composed of one ASCII character.

The R_S field is composed of two ASCII characters and represents a result of processing a request message in a bitmap form.

Table 2 shows the meaning of the R_S field for the message processing result.

Of the two characters (16 bits) constituting the R_S field, the remaining 14 bitmaps except for D8 and D16 2 bits, which are used as parity, indicate the processing result of the message.

R_S field meaning B 1 Normal processing completed B 2 SO out of range B 3 SW range exceeded B 4 SR out of range B 5 Spare B 6 Spare B 7 Default set 1 B 9 Frequency range exceeded B 10 Forward power range exceeded B 11 Forward power lower limit exceeded B 12 Temperature upper limit exceeded B 13 Soft download success B 14 Soft download failed B 15 Default set 1

If there is no error as a result of the message processing of the transmitter, only B1 is set. Otherwise, the generated error is displayed on the bitmap and reported to the HSCM.

For subsequent GS polls during transmitter software download, the transmitter MUST report the result of the software download process, B13 or B14.

The NBC field consists of two ASCII characters representing the number of characters in the data field.

The data field is defined in the subsequent serial message exchange portion. When the HSCM uses the data field, the transmitter reports only the processing result through the R_S field. When the HSCM does not use the transmitter, the transmitter reports the processing result through the data field.

The BCC field adds the entire data field branch in STX to transmit the lowest 8 bits in two ASCII characters. The four most significant bits are sent first.

The ETX field has ASCII 'End of Text' = [0x03].

Since the protocol according to the present invention is basically bidirectional 9600bps asynchronous serial communication, each of the above formats can be repeatedly transmitted up to two times by HSCM.

The required message in HSCM is processed by the transmitter within the maximum message response timeout (500ms), and the result must be forwarded to HSCM.

If the message requested by HSCM is transmitted normally, the receiver assumes that only valid character strings starting with STX are interpreted as valid data.

If there is no parity error in message transmission after receiving up to ETX, the receiving side compares and searches for BCC and transmits the message processing result to the transmitting side. The sender checks the R_S field of the processing result sent from the receiver, and checks the data field if necessary.

When the receiving side receives the abnormal message, the receiving side records the reason for the inability to process the message in the R_S field and reports it to the transmitting side.

After sending a message in HSCM, if an error on the link or a failure of the transmitter occurs and processing of the message becomes impossible, HSCM waits up to 500ms and retransmits the message.

If there is no response after waiting up to 500ms after retransmission, HSCM will report an error to the upper layer.

If an error on the link or a failure of HSCM occurs after transmitting a response message from the transmitter and the message processing is impossible, the transmitter waits for the next polling message within a maximum of 3 seconds.

If there is no polling message within 3 seconds, it is considered a failure of HSCM and an I20 timeout error is reported to the upper layer.

The parallel interface specification according to the present invention is as follows.

The data bits (MS and LS bits) are valid at the rising edge of the clock signal, and the rising edge of the clock is synchronized in absolute time by the GPS receiver. The transmitter stores the newly input data and transmits it by this clock (50% shift point).

4 is a timing diagram showing a signal by the parallel interface of the present invention.

As shown, the input data becomes valid from the time when the clock rises by 50%.

Message transmission by the parallel interface of the present invention is shown in Table 3 below.

Paging Protocol LS bit MS bit Reference clock Remarks FLEX6400 (Level 4) 3200 bps 3200 bps 3200 Hz FLEX3200 (Level 4) 1600 bps 1600 bps 1600 Hz FLEX3200 (Level 2) low 3200 bps 3200 Hz FLEX1600 (Level 2) low 1600 bps 1600 Hz POCSAG 1200 low 1200 bps 1200 Hz POCSAG 512 low 512 bps 512 Hz

As mentioned above, it has the speed of the LS bits, the speed of the MS bits and the speed of the reference clock according to the protocol used in the paging system.

Hereinafter, the serial message exchange according to the present invention will be described in detail.

5 shows a message structure by serial message exchange of the present invention.

As shown, each message is transmitted in the order of type, length, and value. In case of a message without data, only a type field and a length field are transmitted.

The type consists of two ASCII characters to indicate a command or a reply to the command. The types of messages transmitted / received between the HSCM and the transmitter by the present invention are shown in Table 4 below.

The length consists of two ASCII characters used to represent the number of characters in the value field, and has a value from 0x00 to 0xD0. If there is no value field, the length field is zero.

The value field is used to indicate the data of the message.

Table 4 shows the serial message according to the present invention.

type Request (HSCM ⇒ TX) Answer (TX ⇒ HSCM) GS condition Status (data) GF All states All state (data) GA Report alerts Report Alerts (Data) GV Software version Software version (data) SC Transmitter Channel Data (Data) Transmitter channel data SO Output power upper limit (data) Output power upper limit SW Reflected Power 1 (Data) Reflected power 1 SR Reflected power 2 (data) Reflected power 2 SP Transmitter Channel Power (Data) Transmitter channel power ST Upper temperature limit (data) Upper temperature limit CA Current alarm clear Alarm clear SD Download Transmitter Software (Data) Transmitter software download

The get brief status (GS) of the serial message according to the present invention is a message for determining a transmitter basic operation status, and is polled periodically (1 second) when there is no other message to be sent.

If there is no response within 500ms after the message is sent, HSCM considers the transmitter to be a failure.

Table 5 shows the GS messages required by the HSCM.

data Number of bytes type 'GS' 1,2 Length '00' (HEX) 3,4

Table 6 shows the GS messages responding to the transmitter.

data Number of bytes type 'GS' 1,2 Length '01' (HEX) 3,4 value Brief state 5

The value of BS is expressed in 7-bit ASCII and is indicated in LSB.

Table 7 shows the structure of 7-bit ASCII constituting the value field of the BS.

D7 D6 D5 D4 D3 D2 D1 D0 P One x x x M A T

Bit M shown in Table 7 is set to '1' in maintenance mode and '0' in maintenance mode to indicate the maintenance status of the transmitter.

Bit A represents the alarm state of the transmitter and is set to '1' when an alarm occurs.

The bit T represents a key state of the transmitter, and is set to key up when set to '1' and key down when set to '0'.

In the serial message according to the present invention, GF (get full status) is a message requesting a status response for all valid parameters currently being interworked, and is polled periodically (5 seconds) with respect to a currently interworking transmitter.

If there is no response within 500ms after the message is sent, HSCM considers the transmitter to be a failure.

Table 8 shows the GF messages required by the HSCM.

data Number of bytes type 'GF' 1,2 Length '00' (HEX) 3,4

Table 9 shows GF messages responding in HSCM.

data Number of bytes type 'GF' 1,2 Length '12' (HEX) 3,4 value 5 to 22

As shown in Table 8 and Table 9, the length of the GF message is '12' (HEX), two characters representing the output power in two watts, two characters representing the return power in one watt, two characters as a spare area, It consists of two characters representing the upper temperature limit, two characters representing the current temperature, four characters representing the frequency offset in Hz, and four characters representing the frequency shift in Hz.

In the serial message according to the present invention, GA (get report all alarms) is a message requesting all alarm states for the transmitter.

Table 10 shows GA messages required by HSCM.

data Number of bytes type 'GA' 1,2 Length '00' (HEX) 3,4

Table 11 shows the GA messages responsive to the transmitter.

data Number of bytes type 'GA' 1,2 Length '16' (HEX) 3,4 value 5 to 26

The GA has an alarm code value according to the cause of the transmitter alarm.

Figure 6 shows a configuration table showing all the alarms of the present invention.

As shown, eight fields are used to indicate an alert.

The causes of the transmitter alarm are as follows.

High Forward Power fail (HFP fail) occurs when more forward power is detected than the upper limit.

Low Forward Power fail (LFP fail) occurs when forward power is detected below the lower limit.

High Reflect Power 1 fail (HR1 fail) occurs when more reflected power is detected than the upper limit-1 value (warning level).

A high reflected power-2 fail (HR2 fail) occurs when more reflected power is detected than the upper limit-2 value (transmitter block).

Unlock fail (UCK fail) occurs when a frequency setting error occurs during out of lock of a phase locked loop (PLL) that generates a clock.

Power Supply Unit fail (PSU fail) occurs when power supply fails.

I20 interface failure (I20 fail) occurs when interworking with HSCM.

High Temperature (HT fail) occurs when the temperature is detected above the upper limit.

The get software version (GV) of the serial message according to the present invention is a message for obtaining a transmitter major version at initialization or when re-initialization after disconnection of the transmitter.

Table 12 shows the GV messages required for HSCM.

data Number of bytes type 'GV' 1,2 Length '00' (HEX) 3,4

Table 13 shows the GV messages responding at the transmitter.

data Number of bytes type 'GV' 1,2 Length '18' (HEX) 3,4 value 5 to 28

The value field of the GV is composed of eight characters indicating the type of transmitter, eight characters indicating the version number, and eight characters indicating the version date.

Among the serial messages according to the present invention, SC (set TX channel data) is a message for setting up a current radio frequency channel database of the transmitter when the key state of the transmitter is changed (key down → key up).

However, if the same high frequency channel is used continuously, SC command is not used even if the key state is changed.

Table 14 shows SC messages required by HSCM.

data Number of bytes type 'SC' 1,2 Length '14' (HEX) 3,4 value 5 to 23

The value field of the SC message required by the HSCM includes one character as a spare area, seven characters representing a frequency value in units of 10 Hz, four characters representing a frequency shift in units of Hz, and four characters representing a frequency offset in units of Hz. And two characters representing the forward power setting value in units of 2 watts, and two characters representing the forward power lower limit value in units of 2 watts.

Table 15 shows the SC messages that the transmitter responds to.

data Number of bytes type 'SC' 1,2 Length '00' (HEX) 3,4

The transmitter reports the processing result of the SC message to the HSCM using the R_S field, and maintains the existing value in case of a failure.

HSCM's VDT allows input in specific frequency ranges and 25kHz steps.

For example, if the frequency is 327.3 MHz, then 327300000 (Hz) / 10 (step) = 32730000 ⇒ 1F36B90 (HEX).

The set output power high limit (SO) in the serial message according to the present invention is a message for adjusting the output power upper limit (alarm limit) of the transmitter.

Table 16 shows the SO messages required by HSCM.

data Number of bytes type 'SO' 1,2 Length '02' (HEX) 3,4 value 5,6

The value field of the SO message required by HSCM consists of 2 characters representing the upper limit of the output power alarm in 3 watts.

Table 17 shows the SO messages responding at the transmitter.

data Number of bytes type 'SO' 1,2 Length '00' (HEX) 3,4

The transmitter reports the processing result of the SO message to the HSCM using the R_S field, and maintains an existing value when a failure occurs.

The set reflected power (SW) in the serial message according to the present invention is a message for adjusting the reflected power (warning limit value) of the transmitter.

Table 18 shows the SW messages required by HSCM.

data Number of bytes type 'SW' 1,2 Length '02' (HEX) 3,4 value 5,6

The value field of the SW message required by the HSCM consists of two characters representing the reflected power as a warning limit value in units of 1 watt.

Table 19 shows the SW messages responding at the transmitter.

data Number of bytes type 'SW' 1,2 Length '00' (HEX) 3,4

The transmitter reports the processing result of the SW message to the HSCM using the R_S field and maintains an existing value when a failure occurs.

Among the serial messages according to the present invention, SR (set reflected power 2) is a message for adjusting the reflected power (transmission blocking limit value) of the transmitter.

Table 20 shows SR messages required by HSCM.

data Number of bytes type 'SR' 1,2 Length '02' (HEX) 3,4 value 5,6

The value field of the SR message required by the HSCM consists of two characters representing the reflected power as a transmission blocking limit value in units of 1 watt.

Table 21 shows SR messages responding at the transmitter.

data Number of bytes type 'SR' 1,2 Length '00' (HEX) 3,4

The transmitter reports the processing result of the SR message to the HSCM using the R_S field and maintains an existing value when a failure occurs.

Among the serial messages according to the present invention, SP (set TX channel power) is a message for adjusting the forward output power (in watts) and the lower limit of forward output power (in watts). However, it can occur only when the transmitter is in operation (key up).

Table 22 shows the SP messages required by HSCM.

data Number of bytes type 'SP' 1,2 Length '04' (HEX) 3,4 value 5 to 8

The value of the SP message required by the HSCM is composed of two characters representing the forward power setting value in 2 watt units and two characters representing the forward power lower limit value in 2 watt units.

Table 23 shows the SP messages responding at the transmitter.

data Number of bytes type 'SP' 1,2 Length '00' (HEX) 3,4

The transmitter reports the processing result of the SP message to the HSCM using the R_S field and maintains an existing value when a failure occurs.

ST (set temperature high limit) of the serial message according to the present invention is a message for resetting the upper temperature limit currently set in the transmitter.

Table 24 shows ST messages required by HSCM.

data Number of bytes type 'ST' 1,2 Length '02' (HEX) 3,4 value 5,6

The value field of the ST message required by the HSCM consists of two characters representing the upper temperature limit.

Table 25 shows the ST messages responsive to the transmitter.

data Number of bytes type 'ST' 1,2 Length '00' (HEX) 3,4

The transmitter reports the processing result of the ST message to the HSCM using the R_S field, and maintains an existing value when a failure occurs.

When setting the default value for the transmitter at the factory, the upper temperature limit is 99 ° C.

The clear current alarm (CA) in the serial message according to the present invention is a message forcibly clearing a fault that occurs at the current transmitter.

Table 26 shows CA messages required by HSCM.

data Number of bytes type 'CA' 1,2 Length '00' (HEX) 3,4

Table 27 is a CA message responsive to the transmitter.

data Number of bytes type 'CA' 1,2 Length '00' (HEX) 3,4

The transmitter reports the result of the processing of the CA message to the HSCM using the R_S field.

The GA, GV, SC, SO, SW, SR, SP, ST and CA messages are selectively transmitted to the transmitter when needed in HSCM. If there is no response within 500ms after the message is sent, HSCM considers the transmitter to be a failure.

Among the serial messages according to the present invention, SD (TX software download) is a message for downloading the transmitter operating software.

Table 28 shows the SD messages required by HSCM.

data Number of bytes type 'SD' 1,2 Length Up to '208' (HEX) 3,4 value SD data

7 shows a value field of an SD message required by the HSCM according to the present invention.

As shown, a total number of 4 characters of blocks, which is the total number of software blocks (200 bytes) to be sent; 4 characters of outgoing blocks, the number of outgoing blocks; The download software message block consists of up to 200 characters.

The download software message block constitutes 200 bytes per one block for all blocks except the last block.

Table 29 shows the SD messages responding to the transmitter.

data Number of bytes type 'SD' 1,2 Length '00' (HEX) 3,4

The transmitter software is limited to 128 KB, so up to 656 blocks.

To download the transmitter software, a file written in ASCII code must be embedded on the HSCM's memory board, so special work must be done by the HSCM manufacturer.

If there is no response within 500ms after the transmission of the SD message, the HSCM considers a transmitter failure. The transmitter shall report the result of the processing in GS Polling within 30 seconds of completion of downloading.

The transmitter also uses a 3 second timer internally and generates a timeout error when no serial message is received for 3 seconds.

8 is a message flow diagram illustrating message retransmission according to the present invention.

8A is a message flow diagram illustrating a normal operation case.

As shown, if the response message is received from the transmitter within a specific time T0 after the request message is transmitted from the HSCM, it is a normal operation.

FIG. 8B is a message flow diagram illustrating an abnormal operation (retransmission).

As shown, HSCM retransmits the same message if no response message is received from the transmitter within T0 after the request message is sent from HSCM. The transmitter then sends a response message within T0.

Fig. 8C is a message flow diagram illustrating an abnormal operation (transmitter failure).

As shown, no response message is received from the transmitter within T0 after the request message is sent from the HSCM, causing the HSCM to retransmit the same message. If the response message is not received after the message is retransmitted, the HSCM determines that the transmitter has failed.

The HSCM using the transmitter control method according to the present invention will control the transmitter using the message as described above.

9 is a message flow diagram illustrating a process of initializing a transmitter using a serial message according to the present invention.

As shown, the message transmission and reception between the HSCM and the transmitter generated during initial installation of the base station, HSCM initialization, and transmitter initialization is shown. On reset, the HSCM sets all parameters on the transmitter except the channel parameters of the transmitter.

HSCM uses the GS command to request the status of the transmitter, and the transmitter responds by setting the MAT bit. At this time, when communication between the HSCM and the transmitter is made, the transmitter initialization process is performed by the HSCM's own transmitter management database.

The HSCM performs the initialization flow only for its own database and I20 alarms, and the transmitter clears any communication with the HSCM in the event of an I20 timeout error.

The transmitter initialization command begins with the GS command and ends with the GV command, as shown. Channel parameters are set by the SC command before a call to the channel is made.

The operation of the transmitter is done by the HSCM, and the channel parameters by the SC command must be set before the key state of the transmitter changes from down to up.

10 is a message flow diagram illustrating the operation of a transmitter according to the present invention.

As shown, the active transmitter must be driven using the SC command after initialization.

The spare transmitter waits for an SC command after initialization.

The switching of the main transmitter (active transmitter) and the spare transmitter is performed by failure of the main transmitter or at the command of the operator. Occurs when the transmitter is in self-test mode (maintenance mode set).

11 is a message flow diagram illustrating a primary / preliminary transfer procedure of a transmitter.

As shown, when the primary transmitter is alerted and a GA message is received, the SC message is used to establish a channel with the spare transmitter.

Restoration of the transmitter is performed by the failure of the main transmitter or at the operator's command. Occurs when the transmitter is released from self test mode.

12 is a message flow diagram illustrating a primary / preliminary recovery process of a transmitter.

As shown, upon notification of the failure release in the GS message at the primary transmitter, the spare transmitter is keyed down and the channel is established with the primary transmitter.

In the transmitter control method according to the present invention, it is possible to mix FLEX and POCSAG protocol signals in the same high frequency channel.

13 is an exemplary view showing a mixing method of FLEX and POCSAG according to the present invention.

When switching from FLEX to POCSAG signals, changes must be made to the channel through the serial interface from HSCM to the transmitter. At this time, the channel change operation at the transmitter must be performed within the guard time.

The switching time of the mixed mode is set to the minimum value without affecting the stable operation of the transmitter.

Once the channel change over the serial interface is complete, the transfer rate of the clock, MS bits, and LS bits must be changed through the parallel interface.

14 is a message flow diagram illustrating a mixing process of FLEX and POCSAG according to the present invention.

As shown, the HSCM and the transmitter use the SC command to recognize the FLEX / POCSAG mix.

In addition, the transmitter control method according to the present invention, it is possible to multi-channel operation of the POCSAG signal in the same transmitter.

15 is a message flow diagram illustrating a method for operating a POCSAG multichannel according to the present invention.

When switching from POCSAG 1 channel to POCSAG 2 channel, changes must be made using the serial interface from HSCM to the transmitter. At this time, the channel change operation at the transmitter must be performed within the guard time.

The switching time of the mixed mode is set to the minimum value without affecting the stable operation of the transmitter.

In the case of a POCSAG system with 512bps and 1200bps, the transfer rate of the clock, MS bits, and LS bits must be changed through the parallel interface after the channel change is completed through the serial interface.

As with the FLEX / POCSAG conversion, HSCM and the transmitter use the SC command to recognize POCSAG multichannel operation.

The download of transmitter software according to the present invention is executed when there is a request for transmitter download from the VDT or remote OMC of HSCM.

16 is a message flow diagram illustrating a transmitter software download method according to the present invention.

The transmitter verifies the entire downloaded message on its own after receiving the last block SD [N].

Depending on the transmitter's verification results, normally restart by itself to apply the newly downloaded software and report the results to HSCM as the result of the first GS poll that follows.

If the transmitter verifies abnormality, it reports the HSCM as a software download failure in subsequent GS polls.

After sending the last block, SD [N], HSCM considers a software download failure if the transmitter does not report the download result for more than 30 seconds and reinitializes the transmitter.

The present invention operating as described above,

By defining a transmitter interworking protocol for high-speed paging systems, it is possible to support the FLEX protocol, which could not be supported by existing low-speed paging systems.

In addition, by defining various interworking rules (transmitter initialization method, transmitter switching and recovery method) of serial interface and hardware definition of parallel interface, interworking with other types of systems is possible as long as the transmitter interworking protocol is observed.

In the future, the addition of a transmitter control method in serial messages can be extended by further defining only messages for serial message exchange.

Claims (59)

A paging system comprising a transmitter controller and several primary transmitters in operation and standby spare transmitters, A parallel interface for transmitting data to a transmitter using data bits consisting of MS bits and LS bits using a reference clock synchronized in absolute time by a GPS receiver; Bit of the STX field indicating the beginning of the message, the FSN field indicating whether the current frame is a new frame or a retransmission frame, the REP field indicating the number of repeated frame transmissions, the reserved REV field, and the result of processing the request message. An R_S field in the form of a map, an NBC field indicating the number of characters in the data field, a data field for serial message exchange, a BCC field which is an error checksum for the STX to DATA fields, and an ETX field indicating the end of the message. A serial interface for controlling the transmitter using a message format configured to include; Configured, including a link level interface, for controlling a transmitter for a paging system. The method of claim 1, wherein the parallel interface, A hardware control method for a paging system, characterized in that the data bits synchronized by the reference clock at RS 422 level are successively written to the FIFO and sent to the transmitter. The method of claim 1, wherein the parallel interface, When using the FLEX6400 4-level paging protocol, it has an LS bit having a transmission rate of 3200bps, an MS bit having a transmission rate of 3200bps, and a reference clock of 3200Hz; When using the FLEX3200 four-level paging protocol, it has a LS bit having a transmission rate of 1600 bps, an MS bit having a transmission rate of 1600 bps, and a reference clock of 1600 Hz; When using the FLEX3200 two-level paging protocol, it has an MS bit with a transmission rate of 3200bps and a reference clock of 3200Hz; When using the FLEX1600 two-level paging protocol, it has an MS bit with a transmission rate of 1600 bps and a reference clock of 1600 Hz; When using the POCSAG1200 paging protocol, it has an MS bit with a transmission rate of 1200bps and a reference clock of 1200Hz; The transmitter control method for a paging system, characterized in that when using the POCSAG512 paging protocol has a MS bit having a transmission rate of 512bps and a reference clock of 512Hz. The method of claim 1, wherein the serial interface has a format of 8 bits including 7 bits of data and 1 bit of parity bits. The binary code is transmitted from the LSB, the transmitter control method for a paging system. The method of claim 1, wherein the FSN is And having ASCII '0' [0x30] through '9' [0x39] consecutively, and repeating with '0' after '9'. The method of claim 1, wherein the REP field has a value of ASCII '0' to '1', so the message by the serial interface allows retransmission of up to two times. The REP field is used only in the transmitter controller. The message processing result of claim 1, wherein each bit map of the R_S field indicates a message processing result. B1 indicates completion of normal treatment; B2 represents beyond the range of the designated upper limit of the output power; B3 represents beyond the range of the warning power reflected power 1; B4 represents beyond the range of reflected power 2, which is the transmitter blocking level; B5 and B6 are reserved parts; B7 represents the default set 1; B9 indicates over frequency range; B10 represents beyond the forward power range; B11 represents beyond the range of the forward power lower limit; B12 represents beyond the range of the upper temperature limit; B13 indicates the success of the software download; B14 indicates failure of software download; B15 indicates a default set 1, wherein the transmitter control method for the paging system. The method of claim 1, wherein when the transmitter controller uses the data field, the transmitter reports the processing result through the R_S field, And when the transmitter controller does not use the data field, the transmitter reports the processing result via the data field. The message of claim 1, wherein the message for serial message exchange of the serial interface data field is: A type field for indicating a command or a reply to the command; A length field for indicating the number of characters in the subsequent value field; And a value field for indicating data of a message according to each type. 10. The method of claim 9, wherein the value field is not included in the message if it is not needed, in which case the value of the length field is '00' (HEX). 10. The method of claim 9, wherein the meaning of each message according to the type field is: GS is a message for determining the transmitter basic operating state; GF is a message for requesting a status response for all valid parameters for all transmitters currently interworking; GA is a message requiring all alarm conditions for the transmitter; GV is a message to obtain the transmitter major version upon initialization or after initialization of the transmitter disconnection; SC is a message for setting up the transmitter's flow high frequency channel database when the key state of the transmitter is changed; Is SO, a message for adjusting a warning value among output upper limit values of the transmitter; SW is a message for adjusting a warning value of reflected power of a transmitter; SR, the message is for adjusting the transmitter blocking value of the reflected power of the transmitter; SP, a message for adjusting the forward output power lower limit; ST is a message for resetting the upper temperature limit set in the transmitter; If CA, the message is forcibly clearing the fault occurring at the current transmitter; SD is a message for downloading the operating software of the transmitter, transmitter control method for a paging system. The method of claim 11, wherein the GS message, And polling periodically if there are no other messages to send. The method of claim 11, wherein the GS message, When required by the transmitter controller, the length field has a value of '00' (HEX), When responding from a transmitter, the length field has a value of '01' (HEX), the value field contains an M bit indicating whether the transmitter is in maintenance mode, an A bit indicating whether an alarm has occurred, and the transmitter key And a T bit indicative of whether it is in an up state. The method of claim 11, wherein the GF message, And polling periodically for all transmitters currently interworking. The method of claim 11, wherein the GF message, The length field is '00' (HEX) when required at the transmitter controller; When responding from the transmitter, the length field is '12' (HEX), the value field contains two characters for the output power, two characters for the return power, two characters for the reserve area, two characters for the temperature limit and the current temperature. Transmitter control method for a paging system, characterized in that it comprises two characters representing the four characters representing the frequency offset and four characters representing the frequency offset. The method of claim 11, wherein the GA message, The length field is '00' (HEX) when required at the transmitter controller; The length field is '16' (HEX) when responding at the transmitter, and the value field includes a cause code of the transmitter alert. The method of claim 17, wherein the value field, If forward power is detected above the upper limit, include a high forward power fault code, If forward power is detected below the lower limit, include a low forward power fault code. If the reflected power is detected above the warning level, upper limit-1, include a high reflected power-1 fault code. If the reflected power is detected above the upper limit-2 value of the RF interruption level, include the high reflected power-2 fault code. Includes an unlock fault code in the case of out of lock of a phase locked loop or a frequency setting error that generates a clock, If the power supply fails, include the power supply fault code, Includes I20 interface fault code in case of malfunction with transmitter controller, Transmitter control method for a paging system, characterized in that it comprises a high temperature failure code if the temperature is detected more than the upper limit value. The method of claim 11, wherein the GV message, The length field is '00' (HEX) when required at the transmitter controller; When responding from a transmitter, the length field is '18' (HEX), the value field contains eight characters indicating the type of transmitter, eight characters indicating the vendor's version number, and eight characters indicating the vendor's version date. Transmitter control method for a paging system, characterized in that it comprises a. The method of claim 11, wherein the SC message, When required by the transmitter controller, the length field is '14' (HEX), and the value field is a spare 1 character, a frequency 7 character, a frequency shift 4 character, an offset frequency 4 character, and a 2 character representing the forward power setting value. And two characters representing a forward power lower limit; The length field is '00' (HEX) when responding at the transmitter, characterized in that the transmitter control method for a paging system. The method of claim 19, The transmitter includes a response to the SC field in the R_S field to transmit, characterized in that for transmitting the paging system. The method of claim 11, wherein the SO message, When required at the transmitter controller, the length field is '02' (HEX), and the value field includes an output power alarm lower limit value of 2 characters; The length field is '00' (HEX) when responding at the transmitter, characterized in that the transmitter control method for a paging system. The method of claim 21, The transmitter reports the processing result of the SO message to the transmitter controller using the R_S field, and maintains a default value when a failure occurs. The method of claim 11, wherein the SW message, When required at the transmitter controller, the length field is '02' (HEX) and the value field includes 2 characters of reflected power; The length field is '00' (HEX) when responding at the transmitter, characterized in that the transmitter control method for a paging system. The method of claim 23, The transmitter reports the processing result of the SW message to the transmitter controller using the R_S field, and maintains an existing value when a failure occurs. The method of claim 11, wherein the SR message, When required at the transmitter controller, the length field is '02' (HEX) and the value field includes 2 characters of reflected power, which is a transmission cutoff limit value; And a value field is '00' (HEX) when responding at the transmitter. The method of claim 25, The transmitter reports the processing result of the SR message to the transmitter controller using the R_S field, and maintains an existing value when a failure occurs. The method of claim 11, wherein the SP message, A transmitter control method for a paging system, characterized in that it can occur only when the transmitter is in operation. The method of claim 11, wherein the SP message, When required at the transmitter controller, the length field is '04' (HEX), and the value field includes two forward power set value characters and two forward power lower limit characters; And a value field is '00' (HEX) when responding at the transmitter. The method of claim 28, The transmitter reports the processing result of the SP message to the transmitter controller using the R_S field, and maintains an existing value when a failure occurs. The method of claim 11, wherein the ST message, When required at the transmitter controller, the length field is '02' (HEX), and the value field includes a temperature upper limit value of 2 characters; And a value field is '00' (HEX) when responding at the transmitter. The method of claim 30, The transmitter reports the processing result of the ST message to the transmitter controller using the R_S field, and maintains an existing value when a failure occurs. The method of claim 30, And a temperature upper limit value initially set at the time of factory shipment of the transmitter is 99 ° C. The method of claim 11, wherein the CA message, The length field is '00' (HEX) when required at the transmitter controller; And a value field is '00' (HEX) when responding at the transmitter. The method of claim 33, wherein The transmitter reports the processing result of the CA message to the transmitter controller using the R_S field. The method of claim 11, wherein the SD message, When required by the transmitter controller, the length field has a maximum of '208' (HEX), and the value field contains a total of 4 characters of software blocks to send, 4 characters of blocks currently being sent, and a maximum of 200 characters of download software message blocks. ; And a value field is '00' (HEX) when responding at the transmitter. 36. The method of claim 35 wherein The number of download software message blocks is configured by 200 bytes per block for all blocks except the last block, transmitter control method for a paging system. 36. The method of claim 35 wherein Transmitter software is limited to 128 Kbytes. The method of claim 11, The transmitter controller polls the transmitter by sending a GS message every 1 second if there is no message to send. The method of claim 11, The transmitter controller polls the transmitter by sending a GF message at 5 second intervals to the currently interworking transmitter. The method of claim 11, The transmitter controller selectively transmits one of the GA, GV, SC, SO, SW, SR, SP, ST, CA messages to the transmitter if necessary. The method of claim 11, And the transmitter controller transmits the SD message to the transmitter upon software download. The method according to any one of claims 38 to 41, A transmitter control method for a paging system, characterized in that it is regarded as a transmitter failure if there is no response within 500 ms after the message is transmitted from the transmitter controller. 42. The method of claim 41 wherein The transmitter receiving the SD message reports the processing result to the transmitter controller in GS polling within 30 seconds after completion of the download. The method of claim 9, Wherein the transmitter generates a timeout error when no message is received for three seconds at the transmitter. A paging system comprising a transmitter controller and several primary transmitters in operation and standby spare transmitters, A first step of assuming that the message received at the receiving side starts with STX and is interpreted as valid data; A second step of comparing and retrieving a BCC when there is no parity error in message transmission after receiving the ETX message; A third step of recording a reason for incapacity in the R_S field and reporting it to the transmitting side when an abnormal message is received in the first to second steps; Transmitting a message processing result to a transmitting side; A fifth step of confirming, by the transmitting side, an R_S field of the processing result sent from the receiving side; And a sixth step of identifying a data field as needed. A paging system comprising a transmitter controller and several primary transmitters in operation and standby spare transmitters, A first step of sending a GS message from the transmitter controller and requesting a basic operating state by the GS message in which the transmitter sets a maintenance mode of the transmitter, whether an alarm has occurred, and a key state of the transmitter with a MAT bit; If necessary, sending a GA message from the transmitter controller to request all alarm conditions for the transmitter and responding with a GA message at the transmitter; A third step of setting, at the transmitter controller, all parameters except the channel parameters of the transmitter using the serial message to the transmitter; And a fourth step of responding with a GV message at the transmitter upon sending a GV message from the transmitter controller to request a major software version of the transmitter. The method of claim 46, wherein the initialization of the transmitter, A method for controlling a transmitter for a paging system, characterized in that performed at initial installation of a base station or at initialization of a transmitter controller or at initialization of a transmitter. The method of claim 47, The transmitter controller is initialized only in the case of an I20 alarm with its own database, and the transmitter clears the communication with the transmitter controller at least once in the case of an I20 timeout error. A paging system comprising a transmitter controller and several primary transmitters in operation and standby spare transmitters, The primary transmitter sets a channel parameter using an SC message before the key state is changed from down to up after initialization, and the preliminary transmitter waits for an SC message after initialization. A paging system comprising a transmitter controller and several primary transmitters in operation and standby spare transmitters, Sending a GS message from the transmitter controller to the primary transmitter and responding by sending a GS message with the MAT bit set to 010; Sending a GA message from the transmitter controller to the primary transmitter and responding with a GA message from the primary transmitter; And when the transmitter controller sends a SC message to the spare transmitter to request channel setup, switching between the primary transmitter and the spare transmitter through a third step of responding with the SC message from the spare transmitter. 51. The method of claim 50, wherein the primary / preliminary transfer of the transmitter is: Characterized in that it is performed when the main transmitter fails or the operator's command or the transmitter's maintenance mode is set. A paging system comprising a transmitter controller and several primary transmitters in operation and standby spare transmitters, Sending a GS message from the transmitter controller to the primary transmitter and responding by sending a GS message with the MAT bit set to 000 in the primary transmitter; Requesting a key down from the transmitter controller to the spare transmitter; And sending a SC message from the transmitter controller to the main transmitter to request channel establishment, thereby recovering the main transmitter through a third step of responding with the SC message from the main transmitter. 53. The method of claim 52, wherein the recovery of the primary transmitter is: A method of controlling a transmitter for a paging system, characterized in that it is performed when a disturbance of the main transmitter is released or a maintenance mode that is a command of the operator or the self test mode of the transmitter is released. A paging system comprising a transmitter controller and several primary transmitters in operation and standby spare transmitters, Send a SC message from the transmitter controller to the transmitter via the serial interface and request a channel change from the FLEX signal to the POCSAG signal, and the transmitter responds with the SC message, A method of controlling a transmitter for a paging system, characterized by performing mixing of FLEX and POCSAG signals by changing the clock, transmission rate of MS bits and transmission rate of LS bits between the transmitter controller and the transmitter via a parallel interface. The method of claim 54, wherein And a FLEX / POCSAG change operation at the transmitter should be performed within a specified guard time. A paging system comprising a transmitter controller and several primary transmitters in operation and standby spare transmitters, Send a SC message from the transmitter controller to the transmitter via the serial interface and request a channel change from the originally used POCSAG1 signal to the new POCSAG2 signal and the transmitter responds with the SC message, When the transmission rate is changed, the mixing of the FLEX and POCSAG signals is performed by changing the clock, transmission rate of MS bits and transmission rate of LS bits between the transmitter controller and the transmitter through a parallel interface. Transmitter control method. The method of claim 56, wherein And the POCSAG1 / POCSAG2 modification at the transmitter should be performed within a specified guard time. A paging system comprising a transmitter controller and several primary transmitters in operation and standby spare transmitters, A first step of sending a GS message from the transmitter controller to request a basic operating state and responding with a GS message from the transmitter; Transmitting, by the transmitter controller, the N SD messages for the N software blocks to download the transmitter operating software, and the transmitter responds with the SD message to each SD message; A third step of verifying the entire downloaded message on its own by the transmitter; A fourth step of restarting the transmitter if the message downloaded in the third step is normal; A fifth step of sending a GS message from the transmitter controller to request a basic operating state of the transmitter and reporting the result of the second step of SD message to the GS message at the transmitter; Paging, comprising the sixth step of reinitializing the transmitter as a software download failure if the transmitter does not report a download result for more than 30 seconds after the transmitter controller transmits the last SD message. Transmitter control method for system. The method of claim 58, And said software block comprises 200 bytes per block for all blocks except the last block.

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