KR19990031552A - Receiving rate increase method in call processing of high speed paging system - Google Patents

Abstract

A preferred embodiment of the method for increasing a reception rate during call processing of a fast paging system according to the present invention is to prevent the reception rate from dropping by using the original high speed protocol even when the amount of a call is small enough to be transmitted by a low speed protocol.

A first step of checking at a paging terminal supporting FLEX that the amount of calls per frame is small enough to be acceptable with a slower protocol than the current protocol; If not acceptable, sending a message to the base station using the original protocol; A third step of creating a message according to the new protocol if possible and transmitting it to the base station; Changing a transmitter related setup of the base station to the new protocol; And a fifth step of transmitting the message to the base station transmitter in accordance with the new protocol.

The present invention configured as described above can increase the reception rate of the terminal by actively changing the transmission rate according to the amount of calls in the plex system supporting FLEX.

Description

Receiving rate increase method in call processing of high speed paging system

The present invention relates to a method for increasing a reception rate during a call processing of a high speed paging system. In particular, in a high speed paging system using a FLEX (Flexible) protocol, a high rate and a low rate can be automatically changed according to a call amount. It is about a method for increasing.

A paging system refers to a system that provides various pager services to each pager wirelessly, and provides data for calling to a base station or a control station serving a cell, which is an area allocated from a paging terminal. When sent, each base station transmits a radio call signal to the pager of the corresponding area.

A typical paging system consists of a paging terminal and a paging transmitter.

Signals transmitted from a public switched telephone network (PSTN) over a standardized E1 trunk are passed through each paging terminal to each base station.

As described above, the radio call signal generated by the paging terminal is modulated and transmitted to a radio frequency (RF) by a paging transmitter in the base station, and the pager distinguishes and transmits a signal for itself.

1 is a block diagram of a general fast paging system.

As shown, signals transmitted from a general public switched telephone network are transmitted to each base station from a paging terminal in which a Global Positioning System (GPS) receiver is installed.

The GPS receiver is used to synchronize world base stations by receiving world standard time (absolute time) from the navigation satellite.

At this time, the paging terminal transmits a signal to the base station through a satellite link or a dedicated wired link using a data service unit (DSU) and a terminal plate.

The transmitter controller in the base station transmits the received data to the base station transmitter in synchronization with the GPS time received from the satellite. The base station transmitter modulates the signal and finally sends call data to each pager.

In the early paging system, a signal generated at a paging terminal was modulated through a modem and transmitted to each transmitter using a dedicated line of a base station. Then, the paging transmitter performs digital RF modulation on the demodulated data through the modem and finally transmits the call data.

Recently, as the number of subscribers increases exponentially, there is a need for larger channel capacity due to congestion of a limited channel. Instead of the conventional asynchronous paging protocol, POCSAG (Post Office Code Standardization Advisory Group), FLEX (Flexible), a high-speed paging protocol, has been developed.

The characteristics of the general fast paging service protocol are as follows.

The first is to increase the transmission speed between the terminal and the base station. In the conventional method, the pager call data generated at the terminal is directly received by the transmitter and modulated to radio frequency. However, in a fast paging system, a controller for a link is provided at a base station to regenerate data transmitted by multiplexing at a paging terminal for each transmitter.

Second is the improvement of the simultaneous delivery method. In the existing system, the delay time for the line was calculated, and the data was delayed and transmitted by the calculated value through the hardware delay circuit of the transmitter. However, the fast paging system uses the GPS receiver installed in the paging terminal and the base station controller to receive accurate world standard time so that the same data can be transmitted from all base stations at the same time.

Third is the improvement of the paging transmitter RF modulation rate and the change in the modulation scheme. Currently, the most commonly used transmitter has a transmission rate of 1200bps in a modulation scheme of two-level frequency shift keying (FSK). That is, one bit transmitted at 1200 bps forms one information. However, a fast paging transmitter may have a transmission rate of up to 6400bps for two- and four-level FSK modulation schemes. In the case of four levels, two bits form one information.

The operation of the paging system using the FLEX protocol having the above characteristics is as follows.

In the case of the FLEX protocol, each address for a terminal is assigned a reference frame within 128 frames appearing on the channel every four minutes, so that the terminal sends out a signal sent from the transmitter only at the time when its own frame appears. Will be received.

In other words, when frame 0 is synchronized at every hour, the terminal can derive the actual time from the current frame and cycle number, thus providing the user with the exact time that does not need to be adjusted within that time. The battery savings can be several times higher than that of the protocol.

In addition, the transmission speed can support many cases such as 1600, 3200, 6400bps faster than the existing 512, 1200bps, it can transmit a larger amount of information than the existing speed. For example, when operating at 6400bps, it can support up to 5 times the volume of a 1200bps POCSAG channel.

The 1600bps FLEX system sends a message at frame 0, cycle 0 at GPS time (real time) at the hour. Each cycle is sent 15 times an hour, each consisting of 128 frames.

Each frame is generated once every 1.875 seconds, and is composed of a synchronization pattern having information such as a speed and a clock of a data pattern that follows, and 10 data blocks containing contents of an actual electrolyte flow data.

2 is a block diagram illustrating a message transmission process of a fast paging terminal.

As shown, the message coming from the paging terminal at the base station determines the transmission rate to the transmitter according to the content of the protocol currently being used.

3 shows a format of a FLEX message transmitted to a base station.

As shown, the frame received by the base station is transmitted to the transmitter at a rate of 1600 bps for the FLEX 1600, 3200 bps for the FLEX 3200-2, 1600 bps for the FLEX 3200-4, and 3200 bps for the FLEX 6400-4. .

In the paging system operated as described above, the FLEX 1600 protocol has a large difference in reception rate at the receiving terminal compared to the FLEX 6400-4 protocol.

However, the paging system determined by the FLEX 6400-4 protocol should use only the FLEX 6400-4 protocol even if the amount of calls is small and enough data is available using the FLEX 1600.

When sending to FLEX, the efficiency is increased because 6400bps can transmit 4 times the data compared to 1600bps depending on the speed. However, the protocol using the 6400bps rate is lower than the protocol using the 1600bps.

That is, since the data transmission rate determined once cannot be changed, a problem arises in that the amount of calls must use at least a high reception rate.

Accordingly, the present invention provides a method for improving the reception rate of a terminal by automatically adjusting the frame rate according to the number of calls per frame during call processing in a paging system using the FLEX protocol to solve the above problems. The purpose is to provide.

1 is a block diagram of a general fast paging system.

2 is a block diagram illustrating a message transmission process of a fast paging terminal.

3 is a format of a FLEX message sent to a base station.

4 is a format of a FLEX message according to the invention.

One preferred embodiment of a method for increasing a reception rate during a call processing of a fast paging system according to the present invention, which is designed to achieve the above object,

A first step of checking at a paging terminal supporting FLEX that the amount of calls per frame is small enough to be acceptable with a slower protocol than the current protocol; If not acceptable, sending a message to the base station using the original protocol; A third step of creating a message according to a new protocol if possible and transmitting it to the base station; Changing a transmitter related setup of the base station to the new protocol; And transmitting a message to the base station transmitter in accordance with the new protocol at the base station.

In the present invention, the first step is to check whether the current protocol is FLEX 3200-4 or FLEX 1600 if the current protocol is FLEX 6400-4,

The first step is to check if the FLEX 3200-2 in the current protocol is acceptable to the FLEX 1600,

The first step is to check whether the current protocol is acceptable to the FLEX 1600 if the FLEX 3200-4,

In the first step, if the current protocol is FLEX 1600, the test is not performed.

In the third step, the message sent to the base station preferably includes both information about the original protocol and the newly accepted protocol matching the base station setup.

The present invention checks whether the FLEX 3200-4 and the FLEX 1600 are acceptable if the protocol is FLEX 6400-4, and if the FLEX 3200-2 is acceptable, depending on the amount of calls to be sent at the paging terminal. 3200-4 checks if FLEX 1600 is acceptable.

As a result of the check, if the frame can be transmitted using the low speed FLEX protocol, the message transmitted to the base station is made into the low speed protocol and transmitted.

Hereinafter, the present invention will be described in detail according to the procedure.

The paging terminal first checks to see if the protocol is acceptable for lower speeds, depending on the protocol.

If the current protocol is FLEX 6400, check whether it is acceptable as FLEX 1600 or FLEX 3200-2. If the test results are acceptable, the message is made for the new protocol.

If the currently used protocol is FLEX 3200-2 or 3200-4, check if it is acceptable for FLEX 1600. If the test results are acceptable, the message is made for the new protocol.

Finally, if the currently used protocol is FLEX 1600, it will always produce a message with the same protocol.

4 shows the format of a FLEX message according to the invention.

As shown, the message that was originally the FLEX 1600 / 3200-2 / 3200-4 / 6400-4 protocol is examined and sent to a new, acceptable FLEX 1600 / 3200-4 protocol, depending on the volume of the call.

Each message sent to the base station includes a portion indicating information by the original protocol and a portion indicating information by the new protocol currently being transmitted.

The message created through the above process is transmitted to the base station as it is. At this time, the transmitter setup of the base station is changed to transmit data according to the new protocol.

The base station sets the speed according to the new protocol and transmits it to the base station's transmitter without changing hardware or software of the existing system.

Since the FLEX protocol includes a sync pattern indicating a speed for each frame, the receiving terminal can recognize the speed of the currently received frame by analyzing the sync pattern included in the front of the received frame.

According to the present invention operating as described above, even if the current protocol uses a speed of 6400bps, if the transmission is possible even at a speed of 1600bps according to the amount of transmission data, the terminal receives a data rate by actively changing the current speed. Can increase.

Claims (6)

A first step of checking, on a frame-by-frame basis, that the amount of calls is small enough to accommodate a slower protocol than the current protocol in a plex terminal supporting FLEX; If not acceptable, sending a message to the base station using the original protocol; A third step of transmitting a message to a base station using a new protocol, if acceptable; Changing a transmitter related setup of the base station to the new protocol; And a fifth step of transmitting a message from the base station to the base station transmitter in accordance with the new protocol. 2. The method of claim 1, wherein in the first step, the current protocol is FLEX 3200-4 or FLEX 1600 if it is FLEX 6400-4. 2. The method of claim 1, wherein in the first step, the current protocol is FLEX 1600 if it is FLEX 3200-2. 2. The method of claim 1, wherein in the first step, the current protocol is FLEX 1600 if it is FLEX 3200-4. 2. The method of claim 1, wherein in the first step, the current protocol does not perform a check if it is FLEX 1600. 2. The method of claim 1, wherein in the third step, the message sent to the base station includes both information about the original protocol and the new protocol that matches the base station setup.