KR100279342B1 - Data redundancy transmission method of reverse radio link for two-way radio call communication system - Google Patents

Abstract

According to the present invention, a wireless call system transmits various redundant transmission control signals to a wireless calling terminal wirelessly through a forward wireless link, and the wireless calling terminal transmits the same data in response to the redundant transmission control signal through a reverse wireless link. The present invention relates to a duplicate data transmission method of the same data in a reverse radio link, which can be transmitted at an interval and increase transmission completion rate of data through the reverse radio link.

The redundant transmission designation method of data according to the present invention is divided into a method of designating a redundant transmission number in call information and a method of redundant transmission according to a preset redundant transmission number in the case of a terminal attempt.

In addition, the method of designating the number of duplicate transmissions in the call information is a duplication in which the radio calling system redundantly transmits reverse data according to radio calling traffic, importance of reverse radio data, or size of reverse radio data through a forward radio link. Transmitting the transmission control information to the radio call terminal; Repetitively transmitting information at regular time intervals at the designated number of redundant transmissions in case of transmission attempt from a radio calling terminal; Repeatedly receiving, by the radio calling system, the number of duplicate transmissions; And determining the contents of the received information by using the repeatedly received packet.

Description

Data redundancy transmission method of reverse radio link for two-way radio call communication system

The present invention relates to a redundant transmission method of a reverse radio link in a two-way radio calling system, and in particular, a radio calling system provides various redundant transmission control designation methods to a radio call terminal wirelessly through a forward radio link, and designated redundant transmission from the forward direction. According to the method, the radio calling terminal may apply the Aloha method and duplicate transmission of the same reverse data, thereby increasing the transmission completion rate of the reverse radio link in which the transmission completion rate due to data collision decreases. will be.

A unidirectional radio call communication system generally consists of one or more switching and central control units, a base station facility, and a unidirectional radio call terminal. Because of the characteristics of the system, since the wireless calling system terminates after performing one-way transmission, the one-way wireless calling system was able to provide a service using only a relatively simple system. It is becoming more sophisticated and complicated due to the expansion of.

In a one-way wireless paging system, a pager user dials a wireless subscriber number and is sent to a central control unit, usually called a wireless calling terminal, through a local exchange, and checks the registration of the subscriber in the database. Coded by the unique number of the radio receiver, it transmits through the transmitter and informs the caller of the fact.

The central control unit makes a call request input from a public switched telephone network (PSTN) according to the registration data for subscriber inquiry, service menu inquiry, etc., and generates a radio call signal corresponding to the received signal to the transmitting station. It performs the function of sending a signal.

In the case of POCSAG, which currently occupies the absolute market of radio calling, the transmission rate is generally 1,200bps (1200 bits per second), and it is difficult to provide various services at such transmission rates. In particular, in the case of text transmission and data transmission, a number of data transmission is required in the case of a number transmission using a BCD code, thereby limiting subscribers accommodated at the same frequency. A high-speed wireless calling method has been proposed to solve this problem.

Examples include Flex (FLEXible) developed by Motorola, European Telecommunicaion Standard Institute (ETSI), European Radio MEssage System (ERMES) and APOC developed by Philips. (Advanced Paging Operators Code) is a one-way dedicated service that cannot determine whether a wireless call terminal is received with respect to data transmitted by a wireless call system and cannot accept a service request of a wireless call terminal. I had. In addition, the subscriber of the wireless calling terminal cannot check what message is in the case of error in part or all of the data even though the predetermined data is transmitted, and the sender of the message considers that the predetermined message is properly delivered. In the following actions, there was a problem that often the wireless communication between the two does not occur correctly.

In order to solve this problem, two-way radio calling has appeared, and the characteristic of two-way radio calling is different from the current one-way radio calling method such as POCSAG or FLEX. can do. That is, whether the message transmitted by the wireless call system arrives correctly can be confirmed through the response from the wireless call terminal.

Looking at the currently developed two-way radio call, there are ReFLEX, which is capable of two-way communication by supplementing some functions of FLEX in Motorola, NexNet developed by NEXUS of Israel, and pACT based on ATPD's CDPD. It is not commercially available.

However, in the reverse radio link of the conventional two-way radio calling system, the Aloha method that does not require a separate control channel is applied, and time slots that are synchronized in time to accommodate a plurality of subscribers at a limited transmission rate are allocated. It can be used jointly. Accordingly, since a plurality of radio calling terminals are allowed to attempt transmission using the same timeslot, a collision may occur and cause a transmission completion rate to decrease.

Therefore, it is necessary to distribute the traffic by using different slots to minimize such collisions, but in the case of the reserved Aloha region, some collisions can be prevented by allocating timeslots in the radio calling system, but in the case of the slot Aloha region, There is a problem that can not reduce the probability of collision due to traffic distribution since slot allocation is impossible.

In addition, if the number of redundant transmissions is fixed, the traffic is weighted according to the redundant transmissions, and since the redundant transmission of data of low importance may collide with the data of high importance, the traffic condition, the importance of the transmission data, and the size of the transmission data It is necessary to adjust the number of duplicate transmissions.

Therefore, the present invention has been made in view of the problems of the prior art, the object of which is to increase the transmission completion rate through the redundant transmission method of data through the reverse radio link in the two-way radio call system, in particular the radio call system is the forward radio link The present invention provides a data duplication transmission method of a reverse radio link that can designate various duplication transmission times and methods to a radio call terminal wirelessly.

1A is a schematic block diagram showing a two-way wireless paging communication system to which the present invention is applied;

1B is a cell configuration of a forward radio link in a bidirectional radio call communication system to which the present invention is applied, and a point paging channel for transmitting radio call information only to a base station where a terminal is located and all base stations within a service range. Diagram showing the frequency allocation of the broadcasting paging channel (Broadcast Paging Channel) for simultaneously transmitting radio call information,

1C is a block diagram showing a reverse cell configuration and frequency allocation of a two-way wireless paging communication system to which the present invention is applied;

2 is a view for explaining the structure of the forward and reverse radio link for explaining the two-way radio call protocol of the two-way radio call communication system according to the present invention;

3A to 3B are diagrams illustrating reverse time slots for explaining a method of redundant data transmission in a slotted ALOHA region of a reverse radio link according to the present invention, respectively;

4A and 4B illustrate a format and a header of a unit packet allocated to a reverse timeslot;

5 is a designation diagram of a reverse timeslot for explaining a redundant transmission method in a reserved Aloha region of a reverse radio link according to the present invention.

(Code description for main part of drawing)

1a-1e; Wireless terminal

2a-2e, 2a1-2e1; Receiver 3a-3e; Peripheral base station

4a-4i; Cell 5; Wireless Call Terminal

6; Public network switch 7; PSTN Network

8a; Internet 8b; Internet server

9a; Telephone 9b; Facsimile

9c; Personal computer 60; packet

100; S-ALOHA region 200; R-ALOHA area

In order to achieve the above object, the present invention provides a duplex transmission method of the reverse radio link of the two-way radio call communication system including one radio call system and a plurality of radio call terminals, the radio call system through the forward radio link Transmitting the redundant transmission control information to the wireless calling terminal; Repeatedly transmitting a packet from the designated redundant transmission control information when the transmission attempt is made from the terminal; Repeatedly receiving, by the radio calling system, the number of duplicate transmissions; It provides a redundant transmission method of a reverse radio link, characterized in that the step of determining the content of the received information using the repeatedly received packet.

When the paging system designates redundant transmission control through the forward radio link, the redundant transmission designation for the entire paging terminal according to the traffic condition, the importance of the transmission data, the size of the transmission data, the redundant transmission designation for the specific paging terminal, and Duplicate designation is possible for the designated terminal for each cell, and it is possible to specify whether or not to duplicate transmission and the number of duplicate transmissions for each general command.

In the case of a transmission attempt from a terminal through a reverse radio link, in the step of repeatedly transmitting the specified number of redundant transmissions, the reverse message transmission from the terminal is any one selected from a timeslot of a slot Aloha region or a timeslot of a reserved Aloha region. It is possible to send in the way.

In the repeated reception by the number of duplicate transmissions, the radio calling system displays the total number of sequential transmissions and the sequential number of duplicate transmissions in the unit packet to be duplicated, and thus it is possible to determine whether there is subsequent data through the first received data and to receive the first received data. Even when an error occurs, it is possible to determine the number of transfer of previous data and the existence of subsequent data.

The assignment of reverse timeslots for redundant transmission is specified by cycling the allocation positions of timeslots for each cycle. In the slot Aloha region, each cycle is designated using a unique ID of the terminal. In subsequent cycles, the number of attempt packets is changed to minimize collision probability for simultaneous attempts of the terminal, and the receiver may predict subsequent attempt packets. In addition, when a duplicate transmission is performed in the reserved Aloha region, a subsequent packet may be predicted by the receiver by using the same reserved Aloha timeslot number for each cycle.

On the other hand, another method for increasing the transmission completion rate in the two-way radio call communication system is a method for receiving a reverse radio link message of the two-way radio call communication system including one radio call system and a plurality of radio call terminals. And receiving the same message transmitted by the radio calling terminal for a repetition number of times, and determining the transmission message through a combination of the same message repeatedly received by the radio calling system.

Therefore, in the present invention as described above, the transmission completion rate of the reverse radio link can be increased by redundantly transmitting the same information when transmitting a message from the radio call terminal to the radio call system through the reverse radio link.

(Example)

Hereinafter, the present invention will be described in more detail with reference to the accompanying drawings.

1A is a schematic block diagram illustrating a two-way radio call communication system according to the present invention, and FIG. 1B is a configuration of a forward cell and a frequency of a point call channel / broadcasting call channel of the bidirectional radio call communication system according to the present invention. Figure 1c is a block diagram showing the assignment, Figure 1c is a block diagram showing the configuration of the reverse cell and the frequency allocation of the two-way radio communication system according to the present invention, Figure 2 illustrates a bidirectional radio call protocol of the two-way radio call communication system according to the present invention 3 is a diagram illustrating a structure of a forward and reverse radio link, and FIG. 3 is a designation diagram of a reverse timeslot for explaining a redundant transmission method of a reverse radio link according to the present invention.

(Forward cell configuration)

FIG. 1B is a diagram illustrating a configuration of a forward cell and frequency allocation of a point call channel / broadcasting call channel in a bidirectional radio call communication system according to the present invention. It is arranged to cover tightly and is connected between the central radio call terminal (5) (3a) and the wire (2) between them.

Peripheral base stations 3a-3i transmit message signals to radio-calling terminals 1a-1e located in their cells 4a-4i using the same frequency f0 to form broadcasting call channels, respectively. At the same time, a point call channel that selects a cell having a highest received field strength (RSSI) of a terminal and calls a terminal 1a-1e located in the cell is selected. Each cell is equipped with a transmitter for transmission using different frequencies (f0-f4). In this case, in order to recycle the limited frequency resource, the non-adjacent cells, for example, the cells 4a and 4e, may be reallocated so that the frequency f0 may be used equally as the transmission frequency for forming the same point call channel. It is.

(Reverse cell configuration)

Meanwhile, FIG. 1C is a block diagram illustrating a reverse cell configuration and frequency allocation of a bidirectional radio call communication system according to the present invention. A plurality of peripheral base stations 3a-3i are arranged to cover a service area without intervening, and a central radio between them. It is connected to the call terminal 5 (3a) by the wire (2).

Peripheral base stations 3a-3i receive message signals transmitted from radio call terminals 1a-1e located in their cells 4a-4i, respectively, using the same frequency f5 to form reverse channels. A plurality of receivers (2a-2d, 2a1-2e1, ...) for each cell are provided, and each receiver (2a-2d, 2a1-2e1, ...) is a peripheral base station (3a-) located in the cell. Connected to 3e).

(Two-way radio call communication system)

First, referring to FIG. 1A, in the two-way wireless paging communication system to which the present invention is applied, one or more base stations 3a and 3b are distributed in a predetermined service area, and each of the neighbor base stations 3a and 3b is wired to a plurality of receivers. (2a, 2b), and the peripheral base station (3a, 3b) is connected to the other two-way radio call terminal 5 by wire.

The radio call terminal 5 is composed of a control device for controlling the connection with the peripheral base stations 3a and 3b, a terminal having various databases built therein, and a public telephone switch 6 and a public telephone connected by wire. Connected to multiple telephones 9a, facsimile 9b, personal computer 9c via Public Switched Telephone Network (PSTN) 7 and multiple Internet servers 8b via Internet network 8a. It connects to perform e-mail, voice and data communication.

The two-way radio call terminal 5 of the present invention transmits a message for the radio call terminals 1a-1c through a downlink radio and receives a message from the radio call terminal through a reverse radio link (uplink). ACK), by receiving a radio call terminal request message that can control the mailbox information such as the location registration response, message inquiry, deletion, retransmission, etc. of the radio call terminal is made bidirectional wireless communication.

(Forward protocol)

In FIG. 1A, the central radio calling terminal 5 and the peripheral base stations 3a-3d are simply referred to as " systems 5 " and the system is capable of transmitting and receiving messages in forward and reverse directions every cell 4a-4i. With one transmitter and multiple receivers, the subscriber station 1 is defined as a terminal having an RF transceiver for receiving messages transmitted from the system 5 via an antenna and transmitting its own messages.

First, when the caller calls the subscriber using the telephone 9a or the computer 9c, for example, via the PSTN network 7, the radio calling terminal 5 responds to these multiple calls through a plurality of forward wireless links. The batches B0-Bn are time-division multiplexed and transmitted, each batch consisting of 16 frames (F0-F15) when 2 ⁿ , e.

In this case, each frame F0-F15 may be, for example, a synchronization signal SC required for frame reception, a frame information signal field FI including synchronization information of the terminal, a terminal control command and a called terminal address ID. Control field (Cntl) and a message field (MSG) including a plurality of message signals, the wireless calling terminal 10 periodically searches only the frame to which it belongs, and during the other frame period The reception of periodic messages for turning off the power of the receiver 12 is performed.

According to the received message, the terminal 1 operates any one of the buzzer, the speaker, or the vibration motor according to the set incoming mode, and informs the subscriber that the message of the wireless call is received and displays the text through the indicator.

(Reverse protocol)

A method of transmitting a message from the radio calling terminal 1 to the radio calling terminal 5 through an uplink radio link will be described with reference to FIG. 2.

First, the number of timeslots (ie, packets) per cycle (CC) (or 1 frame) for the reverse radio link connection from the plurality of radio calling terminals 1 of the present invention is configured to increase with the transmission rate. For example, when the transmission rate is 800bps, as shown in FIG. 2, 10 timeslots (T0-T9) are configured, and when the transmission rate is 6400bps, a unit cycle is determined with a maximum of 60 timeslots. Here, a single packet is transmitted in one timeslot.

Therefore, the maximum number of packets that can be set according to the transmission speed is, for example, 10 at 800 bps, 20 at 1600 bps, 30 at 3200 bps, 60 at 6400 bps, and so on. However, if the transmission rate is 800bps and 1600bps, one packet is set to 150 bits, and for 3200pbs and 6400bps, one packet is set to 200 bits.

As described above, the time occupied by a single timeslot is variably applied according to the transmission rate, and the reverse rate is variably applied from the lowest 800bps. As described above, the transmission rate of the reverse radio link is variably operated and can be specified by the operator. The transmission rate can be set through a notification through the forward radio link, thereby determining the number of packets (time slots) per unit cycle. Specify.

On the other hand, the terminal 1 maintains the forward frame time as a reference time, and the synchronization maintenance rule and the time maintenance rule of the terminal are made the same as the forward protocol.

In this case, each cycle CC of the reverse channel coincides with a forward frame. For example, the reverse cycles specifying the fourth frame F3 and the presented timeslots T0 to T9 are set in the same timing.

The radio call terminal 5 transmits the synchronization information to the terminal 1 through the forward frame information FI, and the terminal 1 reads the frame of the forward channel so as to time the reverse timeslot and the frame information FI. Motivate through. In this case, all timeslot times refer to the same starting point at the beginning of block 0 of every frame. Therefore, the base station transmitter and the radio call terminal of the radio call system are driven at the same timing clock.

On the other hand, the ten timeslots T0-T9 included in the unit cycle CC of the reverse radio link are divided into two regions, namely, slotted ALOHA (hereinafter referred to as "S-ALOHA") protocol. S-ALOHA area 100 to which the timeslot is allocated, and R-ALOHA area 200 to which the timeslot is assigned by the reserved ALOHA (hereinafter referred to as "R-ALOHA") protocol.

The S-ALOHA protocol, which allocates five timeslots T0-T4 allocated to the S-ALOHA region 100, is a protocol that considers the speed of transmission first, and each radio calling terminal 1 is randomly selected. It attempts to transmit its information packet by packet in the reverse time slot. If the selected timeslot does not collide by another radio calling terminal, the message of the radio calling terminal 1 is transmitted to the base station system 5. However, if a random reverse timeslot is already occupied, a collision of information (message) occurs, and thus the transmitted information may not reach the base station system 5 and may require retransmission.

Therefore, when a long message corresponding to a plurality of packet lengths is transmitted, the transmission efficiency is significantly lower than when a single packet message is transmitted.

Meanwhile, the R-ALOHA protocol, which allocates five timeslots T5-T9 allocated to the R-ALOHA region 200, is a protocol that considers transmission stability first and is based on exclusive license assignment from the base station system 5. Is a communication protocol useful for reliably transmitting long data messages by allocating reverse timeslots for the radio calling terminal 1.

That is, in this R-ALOHA protocol, each communication unit, i.e., the radio calling terminal 1, can transmit a message to the base station system 5 by reserving a reverse timeslot necessary for transmitting a long message requiring a plurality of data packets. Will be.

In the reverse radio link of the present invention, the S-ALOHA region 100 and the R-ALOHA region 200 can be variably increased and operated, and the region division of the two regions is provided to the system operator of the base station system 5. By the traffic in each area by considering the ratio of the promptness and stability of the transmission request, the designated zone division code value (BDC) is transmitted to the terminal 1 in a known manner through the forward wireless link The terminal 1 determines the Boundary Division Reference (BDR) for the timeslot using the same.

(Duplicate transmission method)

In the reverse radio link of the present invention, in order to increase the transmission completion rate of the reverse radio link when the timeslot is variably or fixedly operated in the S-ALOHA region 100 and the R-ALOHA region 200 as described above. I'm using.

(1) Setting the number of duplicate transmissions between the system and the terminal

As shown in FIG. 2, the wireless call system uses the default value set in the terminal 1 when there is no separate duplicate designation value with reference to the number of duplicate transmissions included in the message (MSG) in response to a system request. In the message transmission by the terminal attempt, there is a method of designating the number of times of transmission through the forward wireless link based on the value set at the time of initial production of the terminal 1.

In this case, the method or the number of times of redundant transmission of transmission data is designated according to the traffic state of the radio call, the type of reverse data, the importance of reverse data or the size of reverse data when the radio call system 5 transmits control information for redundant transmission. In other words, when the radio call traffic is high, the probability of overlap increases. Therefore, when duplication is specified, only a specific terminal or a reduced number of times is specified.

The method of designating according to the type of the reverse data is designated according to the importance, and in the case of the data having high importance, the number of overlapping designations is increased so that the completion rate of data upon reception in the radio call system 5 can be increased.

In the case of the reverse data size, the collision probability increases when the reverse data is long. Therefore, the number of overlapping designations is reduced for a specific instruction.

Duplicate transmission from the system 5 includes duplicate transmission designation for the entire radio calling terminal 1 when the command in the control field Cntl in the frame of the forward link is a duplicate designation command, When the transmission power is low due to a defect, the redundant transmission designation for a specific wireless calling terminal is made, and when the transmission completion rate is low because the cell has low electric field strength, the overlapping designation is designated for each cell, and in this case, fields (A, B, C) indicates duplicate transmission status, duplicate transmission frequency and unit cycle, respectively.

In addition, there is an overlapping designation method for specifying whether or not duplicate transmission (field A), the number of duplicate transmissions (field B), and a unit cycle (field C) are applied to each general command applied to a general call or location registration request.

If the wireless call terminal 1 that has recognized the duplicate transmission related information in the duplicate transmission command or the general command attempts to transmit the duplicate transmission, the slot Aloha packet may be used.

For example, if duplicate transmission is = Yes, if the number of duplicate transmissions = 5, the unit cycle = 1, duplicate transmission is performed as shown in Figure 3a. In addition, if duplicate transmission = yes, the number of duplicate transmission = 4, the unit cycle = 2, duplicate transmission is performed as shown in Figure 3b.

When canceling redundant transmission, set each field (A, B, C) to '0'.

On the other hand, when receiving a call message transmitted from the system can be transmitted in the reserved Aloha packet specified by the system when transmitting according to the number of duplicate transmissions specified by the system included in the call information of the call message.

An example of this is illustrated in FIG. 5. That is, the message is repeatedly transmitted using the reserved Aloha packet four times per one cycle (CC).

(2) Duplicate transmission and next time slot prediction method

In this method, when the terminal transmits the slot using the Aloha packet, as shown in FIG. 3c, the terminal repeatedly transmits the packet by repeatedly designating the assigned slot of the timeslot for each cycle.

As an embodiment of the present invention, in the first cycle CC1, the first time slot T0 of the slot Aloha region 100 is used, and in the second transmission, the second time of the second cycle CC2 is used. In the case of using the slot T1 and transmitting the third time, the packet is transmitted using the third time slot T2 of the third cycle CC3, the first cycle CC1 and the second cycle CC2, and There is a method of designating the timeslots of the third cycle CC3 to be the same.

On the other hand, changing the allocation position of the timeslot of the next cycle in a cyclic manner is applicable to the case of allocating the reserved timeslot by the system, and it is also possible to designate the reserved Aloha packet.

In addition, unlike the above, as shown in FIGS. 3A and 3B, the same timeslot position may be selected and transmitted for each cycle.

As described above, in the slot Aloha region, each cycle is designated using a unique ID of the terminal, and in subsequent cycles, the number of attempt packets is changed to minimize collision probability for simultaneous attempts of the terminal, and the receiver may predict subsequent attempt packets. There is a way to help.

When a duplicate transmission is performed in the reserved Aloha region, a duplicate transmission method that allows the receiver to predict a subsequent packet by using the same reserved Aloha timeslot number for each cycle is possible.

In order to predict such a subsequent packet, each transport packet 60 is composed of a sync signal (Sync), a header (HD), a linked packet number (LRN), a message (MSG), as shown in FIGS. 4A and 4B. The header HD comprises a terminal address (ID), a total number field (D), and a current number field (E).

Accordingly, as shown in FIG. 4A, when the total number is 2 and the current number is 1, this indicates that the received packet is currently transmitted 1 time out of the total 2, and in the case of FIG. 4B, the current 2nd packet is transmitted out of the total 2 times. It is shown.

(3) Optimal slot selection method

In this method, as shown in FIG. 1C, when a packet received by a duplicate number of identical information is received through a single receiver 2a of the system, a packet in which no error is detected is selected, and a plurality of packets in which no error is detected exist The packet with the largest field strength is selected.

That is, after the radio calling terminal 5 receives the same message transmitted by the radio calling terminal 1 as many times as the number of repetitions, the radio calling system 5 determines the reverse transmission message using the same message repeatedly received. This method is applicable to both slot Aloha and reserved Aloha.

As described above, in the present invention, the transmission completion rate of the reverse radio link can be increased by redundantly transmitting the same information a predetermined number of times when transmitting a message from the radio call terminal to the radio call system through the reverse radio link.

In the above, the present invention has been illustrated and described with reference to specific preferred embodiments, but the present invention is not limited to the above-described embodiments and is not limited to the spirit of the present invention. Various changes and modifications can be made by those who have

Claims (7)

A data duplication transmission method over a reverse radio link of a two-way wireless paging communication system including a wireless paging system and a plurality of wireless paging terminals, Transmitting, from the radio calling system, a control command including data overlapping designation information to a terminal located in the whole or a specific cell through control information for reverse data duplication transmission through a forward wireless link; Storing the data redundant transmission information in a wireless call terminal that receives the control command; Repeatedly transmitting a unit packet at regular time intervals as many times as the number of duplicate transmissions; Repeatedly receiving, by the radio calling system, the maximum number of duplicate transmissions for each data unit packet that is redundantly transmitted when receiving data through the reverse radio link; And determining the content of the received information by using the repeatedly received packet. The method of claim 1, further comprising transmitting a general radio call signal including a control information for reverse redundant transmission from the radio calling system to a radio call terminal through a forward radio link. 2. The method of claim 1, wherein the wireless call terminal transmits the data repeatedly in a unit packet while including, in the data, display information indicating the total number of transmissions and the number of sequential transmissions of redundant transmissions according to the control information for redundant transmissions in a reverse radio link. Repeating transmission at regular time intervals as many times; And receiving subsequent data when there is subsequent redundant transmission data through the indication information, and ending the reception at completion when the subsequent data does not exist. The method of claim 1, wherein the duplication transmission method and number of times included in the duplication control information from the radio call system include at least one of a traffic state of a radio call, a type of reverse data, an importance of reverse data, and a size of reverse data. The redundant transmission method of the reverse radio link, characterized in that according to. The method according to claim 1, wherein when repeatedly transmitting the specified number of redundant transmissions, the slot Aloha region is designated using a unique ID of the terminal for each cycle, and in subsequent cycles, the number of attempt packets is reassigned using the unique ID of the terminal. A method of redundant transmission of a reverse radio link, characterized by minimizing the probability of collision for simultaneous attempts by a terminal and allowing the receiver to predict subsequent attempt packets. 2. The method of claim 1, wherein subsequent transmission in the reserved Aloha region allows the receiver to predict subsequent packets using the same reserved Aloha timeslot number for each cycle. In the data duplication transmission method of the reverse radio link of the two-way wireless call communication system comprising a wireless call system and a plurality of wireless call terminal, Receiving a duplicate number of packets for the same information through a single receiver of a radio calling system; Selecting a packet from which no error is detected among the received packets, and determining a reverse transmission message by using the same message repeatedly received by the radio calling system when there are a plurality of packets not detected by the error. A redundant data transmission method of a reverse radio link for a two-way radio call communication system.