KR100290024B1 - Signal control method of this SMS wireless pager - Google Patents

Abstract

Disclosed is an RF signal control method applied to control operation of a pager in an ERMES system. By such a method, the pager can be connected in synchronization with the base station at the shortest time interval, and can receive a message by quickly finding a home channel and channel scanning. Moreover, the control of this method allows the pager to finish receiving messages in the channel switching mode, in the roaming state, or in a boundary area with a weak signal.

Description

Signal control method of LMMS pager

The present invention relates generally to a method for controlling radio frequency signals, and more particularly to a method for controlling signal transmission and reception of a European radio communication system, i.e., a European Radio Message System (ERMES) radio pager. It is about.

With the development of global trade, the demand for telecommunications has increased rapidly. One popular means of communication is a pager. The first generation pager, POCSAG, can no longer meet the all-round requirements demanded by today's consumer. Therefore, the ERMES protocol of the second generation pager has been proposed to improve the functionality of the pager.

The wireless pager according to the ERMES protocol has the following new features: high transmission rate (about 6250 bps), high reception capability (about 64K bits), roaming function, group call , And remote programming. Since the potential market for ERMES second generation wireless pagers is very large, it can be very beneficial to develop the main devices of ERMES wireless pagers. The performance of the main pager of the pager depends on how to control the operation of the pager.

It is an object of the present invention to provide a method of controlling radio frequency signals of an ERMES radio pager.

1 is a circuit diagram of an ERMES radio pager,

2 is a diagram illustrating a data structure of an ERMES protocol;

3a is a main flowchart of a control method according to the present invention;

3b is a flowchart of an idle process of a control method according to the present invention;

3c is a flowchart of a roaming process of a control method according to the present invention;

3d is a flowchart of a channel locking process of the control method according to the present invention;

4 shows a relationship between a frequency subset number (FSN) and a frequency subset indicator (FSI),

5 is a correlation chart between channel switching and time.

In order to achieve the above object, the present invention includes the following steps (a) to (h).

In step (a), after turning on the pager, the pager continues to check whether the start signal ON is activated (i.e. checks whether the signal ON is 1). If ON is 1, the next step is performed.

In step (b), the radio pager receives batch data from the base station and attempts to establish a synchronization link with the base station by using the data of the synchronization partition in the batch data. . The batch data includes a synchronization partition, a system information partition, an address partition, and a message partition.

In step (c), the pager checks whether a synchronization connection has been made (ie, synchronization index synflag is 1). If the new flag is 1, a synchronization connection is established, and the next step is performed.

In step (d), the pager performs a channel scanning process to find the home channel, since the starter channel is not necessarily the home channel.

In step (e), the wireless pager is a frequency subset indicator (FSN) established at the wireless pager and a frequency subset indicator (FSI) packaged in the operator identity (OPID _p ) and system information division. ) And operator identity (OPID). If the comparison is not matched, then the roaming process is performed. If it is matched, the next step is performed.

In step (f), the pager performs a channel locking process to find and direct home channels for receiving messages.

In step (g), the pager compares its initial address (IA) with the packaged data in the address segment. If there is an address corresponding to the initial address of the pager in the address classification, the pager can find and direct to that channel and proceed to the next step, or else the channel locking process is performed again.

In step (h), the pager repeatedly receives data in the message segment, and if the pager finishes receiving data in this message segment or after a predetermined reception time interval, step (f) is performed again.

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

1 shows a circuit diagram of an ERMES radio pager. This pager includes a protocol processing device (protocol), a channel scanning device (chanscan) and a radio frequency signal controller (RFcontrol), three of which are described below.

1. Protocol processing unit

The protocol processing apparatus is used to format the data structure as shown in FIG. First, the day is divided into 24 sequences, so the time interval of one sequence is one hour. One sequence is then divided into 60 cycles so that the time interval of one cycle is one minute. Each cycle contains 5 subsequences, so the time interval of one subsequence is 12 seconds. Each subsequence is divided into 16 batches. Each of the first to fifteenth batches A to O has 154 codewords, and the sixteenth batch has 190 codewords. Every codeword consists of 30 bits.

Each batch has four data parts.

(1) A synchronization partition has a synchronization codeword and a preamble codeword for establishing a synchronization connection.

(2) The system information partition includes three system codewords, SI1, SI2 and SSI. SI1 and SI2 are messages: country code (7 bits), operator code (3 bits), radio calling area code (PA code, 6 bits), external traffic indicator (ETI, 1 bit), frequency subset indicator ( FSI, 5 bits), cycle number (6 bits), subsequence number (SSN, 3 bits) and batch number (4 bits).

(3) The address partition contains the initial address (IA) of the pager.

(4) A message partition contains messages for delivery to a pager.

When the pager is turned on, after activating the startup signal ON (ON = 1), the protocol processing unit starts counting based on the system clock signal solk, and starts the phase-lock loop. By converting the digital data received from the data into codewords, batches, subsequences, cycles, sequence data, the radio frequency signal controller (rfcontrol) can generate an accurate radio frequency control signal according to the received data.

2. Radio Frequency Signal Controller

3A-3D show flowcharts of a method for controlling a radio frequency signal controller in a pager. Figure 3a shows a main flowchart of the control method according to the present invention, each step being described as follows.

Step a: The pager (or radio frequency signal controller) continuously checks the state of the start signal ON, and if ON is equal to 1, the next step is performed.

Step b: The two time intervals of the batch in the start-up channel function as one time unit and the radio frequency circuitry is turned on for two thirds of all time units so that the radio frequency controller is turned on The synchronization distinction is nested during that time unit to allow reading. Therefore, the pager can attempt to establish a synchronization connection with the base station as quickly as possible.

Step c: Next, the pager checks the flag synflag and if the new flag is equal to 1, it means that the synchronization connection is established, otherwise the idle test procedure (IDLE) if the synchronization connection failed. This is done.

Step d: After synchronization, the pager performs a channel scanning process to find the home channel since the start up channel is not necessarily the home channel.

Step e: The pager sets the frequency subset number (FSN) and the operator identity (OPID _p ) operator identity (FSN) established in the pager to the frequency subset indicator (FSI) and the operator. Compare the operator identity (OPID) and perform the following steps if it is a match.

If the comparison is not a match, then the pager may be in a roaming state and thus cannot receive a corresponding indicator. Therefore, a roaming process (ROAM) must be performed to check whether the pager is in the roaming state.

The relationship between a frequency subset number (FSN) and a frequency subset indicator (FSI) is shown in FIG. 4. Possible values of the frequency subset number (FSN) are 00, 01, ..., 15 and possible values of the frequency subset indicator (FSI) are 00, 01, 02, ..., 30 arranged in a tree shape. Referring to FIG. 4, the preset frequency subset number (FSN) in the pager is 12, for example, and the frequency subset indicator (FSI) received by the pager is any one of 12, 22, 27, 29 or 30. This means that the pager has found the home channel.

Step f: The pager performs a channel locking process that seeks to find and direct to the home channel to receive the message.

Step g: The pager compares its initial address (IA) and the packaged data in the address segmentation, and if there is an address in the address segment corresponding to that pager's initial address, the pager looks for the channel and then directs it. Proceed to step or otherwise, a channel locking procedure (LOCK) is performed.

Step h: After finding the correct channel, the pager repeatedly receives data in the message segment, and if the pager finishes receiving data in the message segment or after a predetermined reception time interval, step (f) is performed again. .

Hereinafter, the idle test process IDLE, the roaming process, and the channel locking process LOCK will be described.

Idle test process IDLE: Referring to FIG. 3B, the idle test process IDLE mentioned in step (c) and FIG. 3A includes the following steps.

( c1 ) if the synchronization establishment fails, if the time has passed a first specific time interval, e.g. 20 hours of subsequence (240 seconds) after starting the idle process, the following steps are performed, otherwise , Step (b) of FIG. 3a is performed again.

( c2 ) if the radio frequency circuitry at the pager is turned off for a second specific time interval, e.g., a 24-hour interval of subsequence 288 seconds, then step (b) of FIG. 3A is performed again. .

Roaming process (ROAM): Referring to FIG. 3C, the roaming process (ROAM) mentioned in step (e) and FIG. 3A includes the following steps.

( e1 ) Check whether there is an external traffic indicator in the system information classification (ETI = 1?). If ETI is 1, it means that the pager is in the roaming state and the next step is performed.

Otherwise, check the synchronization connection between the pager and the base station. If the connection is established, step (d) is performed again; otherwise, if the connection can be made during a third specific time interval, e.g., 10 time intervals of subsequence (120 seconds), step (d) again. Is performed.

( e2 ) In the case of ETI = 1 in the roaming state, the data will not be delivered on the given channel. The data is distributed to all channels, and therefore the pager receives the data in the channel switching mode until the data is over, and step (d) is performed again.

Reception of data via the channel switching mode is described with reference to FIG. 5. 5 is a correlation chart between channel switching and time. In Figure 5, the abscissa is a time scale and the ordinate is a frequency scale. The data of batches A to P are transferred to channels 01 to 16, respectively, but the batches delivered to channels 01 to 16 are different from those shown in FIG. 5 at the same time. Since data is delivered to other channels while in the roaming state, the pager attempts to receive the home placement directly with the initial address (IA) to improve data reception. In the present embodiment, if the groove arrangement is A (black block), the channels are in the order of 01-03-05 ... 15-16-14 ... 04-02-01, as shown in FIG. Is switched. Thus, the pager can continue to get home placement A during channel switching when time flows along the time coordinates of FIG. 5, improving efficiency.

Channel Locking Process (LOCK): Referring to FIG. 3D, the roaming process (ROAM) mentioned in step (g) and FIG. 3A includes the following steps.

( g1 ) Checking the frequency subset indicator (FSI) and the operator identity (OPID) in the received system information division, if they are not present, it means that the previous home channel locking is wrong, and step (f) is performed again to Find and direct your channel.

Otherwise, without the frequency subset indicator (FSI) and operator identity (OPID), the pager may be in a roaming state. Furthermore, if there is an external traffic indicator in the received system information classification, that is, ETI = 1, the next step (g2) is performed. Otherwise, if the counter value exceeds a certain value N, step (b) is performed again, otherwise step (f) is performed again.

( g2 ) When ETI = 1, the pager receives the data in the channel switching mode as described above until the data is over, and step (d) is performed again. This step is the same as step (e2) and thus step (e2) can be carried out instead of step (g2).

3. Channel scanning device

The function of the channel scanning device in a pager is to control channel switching in several specific orders so that it can continue to track and receive data of the home layout during channel switching to improve efficiency, as shown in FIG. .

On the other hand, when a user moves from one area to another, the base station may be different in these two areas, so reception of the pager will be affected or disturbed due to channel frequency differences. Moreover, when the user is in the surrounding area between two base stations, the pager cannot find one single frequency channel, thus reducing the performance of the pager.

To overcome this problem, the present control method may further include two detection processes B1 and B2 as dashed blocks shown in FIG. 3A. The functions of steps B1 and B2 are the same. If the boundary area indicator BAI is detected as 1 in the system information division, the pager performs step (e2) of FIG. 3C to receive data in the channel switching mode. Step (d) is performed again when the data transfer is terminated.

The above border zone check step (B1) is performed before performing the channel locking step (f). If the pager is at or around the perimeter before channel locking, it is not necessary to perform the channel locking step to improve efficiency.

The border zone check step (B2) described above is performed after performing the channel locking step (f). Although the channel is found, step B2 is performed to optimize the performance of the pager while the channel frequency is changing, since the user can move from the original base station area to any base station or another area with a frequency.

As described above, a method for controlling a signal of an ERMES radio pager according to the present invention includes a protocol processing device, a channel scanning device and a radio pager including a radio frequency signal controller synchronized with a base station during the shortest time interval. It allows you to connect and channel scanning to find your home channel so you can receive messages quickly. Moreover, under the control of the method, the pager can complete receiving messages even in the channel switching mode, even in a surrounding area with a roaming state or a weak signal.

Although the invention has been described by way of example and through preferred embodiments, the invention is not limited to the embodiments so described. On the contrary, it is intended to include devices similar to the various variations apparent to those skilled in the art. Therefore, the scope of the appended claims should be construed broadly to encompass all such variations and similar arrangements.

Claims (16)

In the method of controlling a signal of an ERMES radio pager, Repeating the test until a start signal is detected (a), Receiving batch data from a base station and causing the batch data to be synchronized with the base station by using the data packaged in the synchronization segment, including synchronization segmentation, system information segmentation, address segmentation and message segmentation (b), (C) checking whether a synchronization connection has been made and, if so, performing the next step, otherwise performing an idle process; Performing channel scanning (d), Comparing the frequency subset number and operator identity established in the pager with the frequency subset indicator and operator identity packaged in the system information classification with the frequency subset indicator and operator identity packaged in the system information classification, if the comparison result is not matched, roaming (E) performing the next step if the process is performed and matching, First border zone check step (e *) that primarily checks for the presence of a boundary zone indicator. (F) performing channel locking if no boundary zone indicator is detected in the first boundary zone check step (e *), A second boundary zone check step (e **) which performs a second boundary zone check step secondary to check whether there is a boundary zone indicator; If no boundary zone indicator is detected in the second boundary zone check step (e **), the initial address of the pager and the data packaged in the address classification are compared, and the address zone corresponding to the initial address is determined. If there is an address, the pager finds a channel and proceeds to the next step; otherwise, the channel locking process is performed again (g), Receiving the data repeatedly in the message division, if the wireless pager completes the reception of the data in the message division or when a predetermined reception time interval has passed (f) is carried out comprising a step (h) MELS wireless pager signal control method. The method of claim 1, wherein the idle process is performed if the synchronization connection is not made in the step (c). Step (c1), wherein after the start of the idle process a check is made whether a first specific time interval has passed, if so, the next step is carried out, otherwise step (b) is carried out again; And (c2) turning off a radio frequency circuit in the pager for a second specific time interval, and then performing step (b) again. The method of claim 1, wherein the roaming process, Check whether there is an external traffic indicator in the system information division, and if so, the next step is performed, otherwise check whether there is a synchronization connection between the pager and the base station, and if connection is established, step (d) again. Step (d) is performed again if otherwise the connection can be established during the third specific time interval, otherwise step (b) is performed again (e1), And (e2) receiving the data and performing step (d) again until the data is terminated in the channel switching mode. The method of claim 1, wherein the channel locking process comprises: Check the frequency subset indicator (FSI) and the operator identity (OPID) in the received system information division, and if they are not present, step (f) is carried out again or if the external traffic indicator is in the received system information division, the next step is performed Otherwise step (b) is performed again if the counter value exceeds a certain value, otherwise step (g1) is performed again, And (g2) receiving the data in the channel switching mode until the data is over, and step (d) is performed again. The method of claim 1, wherein 16 batches constitute one subsequence of data, 5 subsequences constitute one cycle of data, 6 cycles constitute one sequence of data, and are occupied by the sequence. The time interval is one hour, and the time interval occupied by the subsequence is 12 seconds. 6. The method according to claim 2 or 5, wherein the first specific time interval is 240 seconds and the second specific time interval is 288 seconds. 6. The method according to claim 3 or 5, wherein the third specific time interval is 120 seconds. In the method of controlling a signal of an ERMES radio pager, Repeating the test until a start signal is detected (a), Receiving batch data from a base station, wherein the batch data includes synchronization segmentation, system information segmentation, address segmentation and message segmentation, such that the pager is synchronized with the base station by using data packaged in the synchronization segmentation (b), Checks whether a synchronization connection has been made, and if so, performs the next step, otherwise the idle process is performed, wherein the idle process checks whether a first specific time interval has elapsed after the start of the idle process; (C1) if the next step is performed, otherwise step (b) is performed again; turning off the radio frequency circuit in the pager for a second specific time interval and then performing step (b) again. (c) comprising (c2), Performing channel scanning (d), Comparing the frequency subset number and the operator identity established in the pager with the frequency subset indicator and the operator identity packaged in the system information division, if the comparison result is not matched, a roaming process is performed. Step (e), Performing channel locking (f), Compare the initial address of the pager with the data packaged in the address segmentation, if there is an address in the address segment corresponding to the initial address, the pager finds a channel and proceeds to the next step, otherwise the channel locking (G) the process is carried out again, Receiving the data repeatedly in the message division, if the wireless pager completes the reception of the data in the message division or when a predetermined reception time interval has passed (f) is carried out comprising a step (h) MELS wireless pager signal control method. The method of claim 8, wherein the roaming process, If it is checked whether there is an external traffic indicator in the system information classification, the next step is performed. Otherwise, if the connection is established by checking whether there is a synchronization connection between the pager and the base station, step (d) is performed again. Otherwise step (d) is performed again if the connection can be made during a third specific time interval, otherwise step (b) is performed again (e1), And (e2) receiving the data and performing step (d) again until the data is terminated in the channel switching mode. The method of claim 8, wherein the channel locking process, Check the frequency subset indicator (FSI) and operator identity (OPID) in the received system information division and if step (f) is not carried out again, or if the external traffic indicator is in the received system information division, the next step is performed. Otherwise, if the counter value exceeds a certain value, step (b) is performed again, otherwise step (f) is performed again (g1), And (g2) receiving the data in the channel switching mode until the data is over, and step (d) is performed again. The method of claim 8, wherein 16 batches constitute one subsequence of data, 5 subsequences constitute one cycle of data, 6 cycles constitute one sequence of data, and are occupied by the sequence. The time interval is one hour, and the time interval occupied by the subsequence is 12 seconds. 12. The method of claim 11 wherein the first specific time interval is 240 seconds and the second specific time interval is 288 seconds. 12. The method according to claim 9 or 11, wherein the third specific time interval is 120 seconds. 10. The borderline checking step of claim 8, wherein a borderline checking step is performed to check whether there is a border zone indicator, and if so, the pager receives data in a channel switching mode until the data is terminated, and then step (d ERMES wireless pager signal control method to perform again). 15. The method according to claim 14, wherein the step of checking the boundary zone is performed after performing step (e), and if step (f) is not detected, the step (f) is performed. 15. The boundary area checking step according to claim 14, wherein the boundary area checking step is performed after performing step (e), and if the boundary area indicator is not detected, step (f) is performed during which the boundary area checking step is carried out in step (f). The method is performed again after performing, and if the boundary zone indicator is not detected, step (g) is performed.