KR100268046B1 - Hop pattern update method using pre-amble pattern in frequency hopping system - Google Patents

Abstract

PURPOSE: A hop pattern updating method using a preamble pattern in an FH(Frequency Hopping) system is provided to elastically and effectively perform a hopping frequency update for various jamming in order to stably transceive control information, and to maximize an ECCM(Electronic-Counter-Counter-Measure) function. CONSTITUTION: A system inputs an initial power for a hop update, and maintains an idle state. The system receives a control signal packet from an RAU(Radio Access Unit) in the idle state, and analyzes information, then maintains the idle state. A hop generator converts a PPF(Ping Pong Flag) toggle value in the idle state of an information analyzing process. The system checks whether a hop updating is completed.

Description

Hop pattern update using preamble pattern in frequency hopping system {HOP PATTERN UPDATE METHOD USING PRE-AMBLE PATTERN IN FREQUENCY HOPPING SYSTEM}

The present invention relates to a hop pattern updating method in a mobile radio system using frequency hopping / code division multiple access (hereinafter referred to as "FH / CDMA"), and in particular, between a subscriber and a subscriber intentionally. The present invention relates to a hop pattern update method using a preamble pattern in a frequency hopping system in which an interference frequency is not transmitted by periodically changing frequency usage while being able to avoid interference when using a strong radio signal.

FIG. 1 illustrates a radio access unit (RAU) and a plurality of mobile subscriber terminal (MST) in a wireless network structure between a base station and a mobile wireless subscriber. FIG. 2 illustrates the inside of a radio access unit (RAU) of FIG. 1 in detail. As shown in FIG. 2, the radio access unit RAU includes a radio unit 201 and a controller 203. The wireless unit 201 is connected to a duplexer 211 for switching according to transmission or reception from the antenna ANT, and a tuner 213 for tuning a signal received through the duplexer 211 upon reception; A demodulator 214 for demodulating the tuning signal of the tuner 213 and transmitting the demodulated signal to the control unit 203, an output combiner 212 connected to the duplexer 211 and coupling an output to a transmission output; An output amplifier 215 connected to the output combiner 212 for amplifying an output signal to be sent, a modulator 217 for modulating a signal output from the controller 203 and inputting the modulated signal to the output amplifier 215; And a time distribution duplexer 216 that provides an operation timing signal of the tuner 213, the duplexer 211, and the output amplifier 215 by the control signal generated from the controller 203. The control unit 203 controls the radio wave interference unit 218 and the entirety of the control unit 203 so as to avoid interference from the signal to be modulated and demodulated during transmission and reception by the modulation / demodulators 214 and 217 of the radio unit 201. A central processing unit 222, a trunk interfacing unit 223 for trunk interfacing with the remote radio access unit (RAU) under the control of the central processing unit 222, and a wireless subscriber under the control of the central processing unit 222. The digital subscriber unit 219 for interfacing with the apparatus, a rate converter 231 for converting the speed of the transmitted / received signal from the radio wave interference unit 218, and the radio interference under the control of the central processing unit 222. The system interface unit 220 connected to the unit 218 to form a system interface, and the digital subscriber unit 219 and the trunk under the control of the central processing unit 222 and the signal through the rate conversion unit 231 Interface It consists of a switching unit 221 for switching between the section 223.

FIG. 3 is a specific block diagram of one mobile subscriber terminal among the mobile subscriber terminals MST1-MST6 of FIG. 1;

A duplexer 301 is connected from the antenna ANT and a low noise amplifier 311 to amplify the signal received from the duplexer 301, and a tuner for tuning the output of the low noise amplifier 311 ( 313, a demodulation unit 315 for demodulating a signal tuned from the tuning in the tuner 313, a radio wave interference unit 317 for removing radio wave interference with respect to the transmission and reception signal, and the radio wave interference unit A modulator 305 for modulating the outgoing signal output from 317, an output amplifier 303 for amplifying the output of the modulator 305 and outputting it to the duplexer 301, and the radio interference The voice subscriber is controlled by the digital subscriber unit 307 for interfacing the digital subscriber to the transmission / reception data with the unit 317, the main controller 319 for controlling the entire mobile subscriber terminal, and the control of the main controller 319. Service control for interfacing with handsets It consists of 309.

4 is a detailed system diagram of a hop generation unit (HOP) of the jamming unit 317 in the embodiment of the present invention.

In FIG. 4, the basic operation is to control a buffer to store or read a frequency hop pattern of a frequency hopping device. The system operates as two functions, one of which is used to access a base station. There is a mode, and the other has a direct mode that allows direct connection between terminals without a base station. The hop map memory 402 (HOP MAP1, 2) is a memory storing frequency hop data and outputs the hop map address generation unit 401 selected from the multiplexer (MUX) or the hop map CPU access unit 408. Hop map access is accessed according to the output of the address buffer. The hop map address generation unit 401 generates an address specifying a network mode or a direct mode, and the hop map CPU access unit 408 stores the hopping frequency in the hop map in the hop map memory 402. A hop write data unit for transferring data to which address of (HOP MAP1, 2) to store; a hop access unit for specifying an address to read a hop map in an operation of reading data of the hop map memory 402; And a hop map read data buffer of a temporary buffer for transferring read data, wherein each of the hop write data unit, the hop access unit, and the hop map read data buffer includes a hop map access address register and a hop map light data register. In addition, the hopmap read data register is configured to be connected. The frame synchronization frequency generator 403 recognizes that the frequency hop data output from the hop map memory 402 (HOP MAP1, 2) is to be set to the next frequency according to one synchronization signal. The next frequency will be patched. The radio control data buffer 404 converts the output of the frame synchronization frequency generator 403 to be set to a desired frequency in the RF module. The converted frequency is transmitted to the radio control data storage 405 to the RF module. Temporarily stored before transmission, the stored data is transmitted to the RF module according to the clock of the RF module, and the RF module sets a frequency with the stored data. Meanwhile, the zero crossing BER measuring unit 409, the decoder 406, and the control signal generator 407 generate the enable signal EN of the hop map address generator 401 according to the state or control signal generated in each of them. It is supposed to occur.

In the system configured as shown in FIGS. 1 to 3, the mobile subscriber station MST1-MST6 is connected to the wireless access unit RAU1 while moving, and the digital subscriber unit 219 of the RAU is connected to each other via an antenna ANT. And a voice or non-voice communication with another terminal through the trunk interface unit 223, the digital subscriber unit 307 of the mobile subscriber station (MST), and the service control unit 309. On the other hand, the relationship between the mobile subscriber station (MST1-MST6) and the radio access unit (RAU1) is to perform frequency hopping (hopping frequency pattern is promised by frequency (f) vs. time (t) between each other) have. The radio access unit (RAU) requires time synchronization with the mobile subscriber station (MST), and the radio access unit (RAU) has a built-in GSP function in order to receive the correct time from the satellite for accurate synchronization. The promised hopping pattern is configured in a random order, but the smaller the configuration of the control frequency continuously transmitted by the radio access unit RAU1, the easier it is to be detected. Because the frequency hopping even if the frequency is hoping, the frequency used can be detected. However, the wireless communication network of the special-purpose communication system requires more hop pattern updates because there are eight control frequencies, which increases the likelihood that the control frequency will be detected by others and receive a jamming signal. When there is an overlapping area between the radio access units RAU1 and RAU1, the radio access units RAU and RAU have the same frequency set used with each other, but have a difference in time as offsets from each other. It works. Due to the offset, even if a set is used for the same control frequency, the same frequency is not transmitted at the same time so that only the mobile subscriber station (MST) at the position of the overlapped region can be properly received. At this time, an indispensable condition is a GPS function of the radio access unit (RAU), which synchronizes the base stations of the radio access unit (RAU) so that the offsets can be usefully applied to each other. Used to synchronize time. In addition, the wireless access unit (RAU) and the mobile subscriber station (MST) is to alternate between the 5ms transmission, 5ms reception line. That is, the reception timing of the mobile subscriber station (MST) is the transmission timing of the mobile access terminal (RAU), and the transmission timing of the mobile subscriber station (MST) is the reception timing of the wireless access unit (RAU). This is because the mobile subscriber station (MST) located in the overlapped region can operate smoothly without the interference of the control signal between the base stations only when the timing is correctly corrected by the time distribution duplexer 216 between the base stations. By using the GPS of the radio access unit RAU, synchronization in absolute time is possible. With this absolute time, hop update is implemented. This is because the wireless access unit (RAU) does not hop update only one RAU but also considers the neighboring RAU and the mobile subscriber station (MST) in the overlapped area. The mobile subscriber station (MST) and the radio access unit (RAU) keeps synchronously by returning 8 frequencies to circular looping, but the frequencies are always transmitted from the radio access unit (RAU). As it is, the detection is not difficult. In addition, since the control packet of the wireless access unit (RAU) has system information, if the data is modified or lost, communication with the mobile subscriber station (MST) is lost and the mobile subscriber station (MST) and the wireless access unit (RAU) cannot operate. The phenomenon will be caused. The control frequency transmits not only the information but also the frequency related information of the radio access unit (RAU). A total of 1200 frequencies are used for the RAU, and information on availability / disuse according to regional characteristics is always transmitted. In a mobile subscriber station (MST), this frequency information is also important data. Because if you do not know the available frequency information can not generate not only synchronization but also traffic frequency. In the MST, if the control frequency synchronization is lost, transmission / reception of the call becomes impossible. That is, when the control frequency is jammed, the operation of the wireless system is stopped and the communication of the wireless network is lost in the tactical communication network. Thus, in order to transmit / receive stable information in the FH / CDMA system and to enhance ECCM functions, a control frequency update for a mobile subscriber station (MST) in a standby state and a traffic frequency update for a mobile subscriber station (MST) in a busy state are performed. Indispensable. As a result, the conventional problem is that in a special field wireless communication network having about 8 control frequencies, a jamming signal is often received when one of the 8 control frequencies is detected from the other side.

Accordingly, an object of the present invention is to provide a method for maximizing ECCM function by enabling a resilient and efficient hopping frequency update for various jamming for stable transmission and reception of the most essential control information between RAU and MST.

In order to accomplish the above object, the present invention uses a Global Positioning System (GPS) in transmitting and matching time data between the RAU and the MST, and the time when the Global Hop Sync (GHS) pattern generated in the RAU arrives at the MST. The period value is 64 units, and in updating the RAU and the MST, not only the control but also the traffic channel are updated at the same time, and the GHS (Global Hop Sync) is received from the RAU due to synchronization loss in the hop update timing of the MST. If it fails, it is configured to search the control update pattern of the RAU using its Real Time Clock (RTC).

1 is a diagram illustrating a wireless network configuration between a general base station and a mobile wireless subscriber.

FIG. 2 is a block diagram illustrating the inside of the RAU in FIG. 1 in detail.

FIG. 3 is a block diagram illustrating the inside of the MST in FIG. 1 in detail.

FIG. 4 is a block diagram specifically illustrating the inside of the hop generator of the ECCM in the jammer 317 of FIG.

5 is a flowchart illustrating operation at initial power-up of a hop update according to an embodiment of the present invention.

6 is an information analysis flow chart when receiving a control signal packet from an RAU in an embodiment of the present invention.

7 is a flowchart illustrating a ping-pong flag (hereinafter referred to as "PPF") conversion operation flow in the hop pattern generator of the present invention.

8 is a flow chart illustrating whether a hop update is completed in an embodiment of the present invention.

9A and 9B illustrate a control channel diagram referred to in an embodiment of the present invention.

10A, 10B, and 10C are basic operation timing diagrams of hop update referred to in the embodiment of the present invention.

DETAILED DESCRIPTION A detailed description of preferred embodiments of the present invention will now be described with reference to the accompanying drawings. In the following description of the reference numerals to the components of the drawings, it should be noted that the same reference numerals as much as possible even if displayed on the other drawings. In describing the present invention, when it is determined that a detailed description of related known functions or configurations may unnecessarily obscure the subject matter of the present invention, the detailed description thereof will be omitted. Terms to be described later are defined in consideration of functions in the present invention, which may vary according to the intention or custom of a user or a chip designer, and the definitions should be made based on the contents throughout the present specification.

5 is a flowchart illustrating an operation of initial power-up of the hop update function referred to in the embodiment of the present invention.

An input process of inputting an initial value of a user,

A current hop pattern generation process of generating a current hop pattern in the input process;

A synchronization detection process of checking whether the RAU is synchronized from the hop pattern generated in the current hop pattern generation process;

When the RAU is synchronized in the synchronization detection process, it is composed of a subscription process of writing for the next hop pattern generation and the next hop generation and subscribing to the RAU.

6 is an information analysis flowchart when receiving a control signal packet from an RAU referred to in an embodiment of the present invention.

A control information receiving process for receiving control information from the RAU,

An update checking process of checking whether the TOD (Time Of Day) value is updated from the received information in the control information receiving process;

When the TOD value is updated in the update checking process, TOD (Time Of Day) and RTC (Real Time Clock) are stored and other control information is stored.

7 is a toggle value conversion flow chart of a ping pong flag (hereinafter referred to as "PPF") in the hop generation unit of the interference prevention unit 305 in the embodiment of the present invention.

When the ping-pong flag toggle value is written, the first step of detecting the preamble first and second patterns and setting the respective preambles,

A second step of checking a state set as a pattern of the corresponding preamble in the first step;

In the second step, when the detection is confirmed with the first and second patterns of the preamble, a third step of converting the hop data memory of the hop generator and the value of the change mode register (CMR) is performed.

8 is a 5ms polling flow chart for checking whether or not an update is completed, which is referred to in an embodiment of the present invention.

A first step of confirming whether or not the Ping Flag flag is enabled;

A second step of enabling the PPF toggle after writing the PPF toggle value to the CMR (Change Mode Register) if it is determined whether the second pattern preamble is detected when the PPF toggle is not enabled in the first step;

A third step of checking whether the PPF flag is equal to the PPF of the CMR by reading the CMR of the PPF when the PPF toggle is enabled in the first and second processes;

In the third process, when the PPF flag is equal to the PPF of the CMR, the next hop pattern is generated and the PPF toggle is disabled, and the fourth process is performed to write the next hop pattern to the memory opposite to the next PPF.

Therefore, a specific embodiment of the present invention will be described in detail with reference to FIGS. 1 to 9A, B and 10A, 10B, and 10C.

The basic operation of the hop update according to the present invention is that the time of day (TOD) information is included in the control packet information of the RAU as shown in FIG. 9A. The TOD is composed of days, hours, and minutes. In FIG. 9A, SID is an identifier of a control packet, a legion ID is a legion number to which the RAU belongs (independent movement when off), and an RAU ID is an ID of an RAU currently transmitting a control packet, which is the same as the MID value. , Cell Type represents the cell type of the current RAU. In Fig. 9B, from bit 7 (BIT 7), the current RAU uses the full-band frequency domain or specifies the frequency division mode, and bit 6-bit 3 indicates the hop period (GE). 2-bit 0 (BIT 2-BIT 0) represents the cell number assigned to the RAU. TOD 1-3 of 24-bit is time information and shows day, hour, and minute information. With reference to this, the MST can know the current time. In other words, the RAU is synchronized with the time. When the MST receives the TAU information of the RAU in the idle state, the MST is corrected by writing to the RTC (Real Time Clock) of the MST. Since the minimum unit of time is in minutes, the time value to be stored is set to X minutes and 0 seconds. . Movements are updated every minute at steady state. When receiving the TAU information of the RAU, every MST is written to the RTC only when it is compared with the previously received TOD information. That is, new TOD information is received in the MST every minute. This information can be used as a basis for searching for a hop pattern by determining the current time when synchronization loss occurs in the MST. On the other hand, GHS (Global Hop Sync) is received every 64 seconds (1 minute 4 seconds) from the RAU as shown in FIG. 10A, and every 128 seconds (2 minutes 8 seconds) or 32 minutes as shown in FIGS. 10B and 10C. Every hop update is made. The hop generator of the MST is composed of two memories, such as the hop map memory 402 of FIG. 4, one of which is currently in use, and the other of which is to be used next. The next memory enable operation to be used is to set a ping flag (PPF) to a toggle value of the current value. The fact that the MST has performed the update operation can be checked by polling whether the toggled PPF has changed. After the hop update is performed in the MST, the next hop frequency is immediately generated and written to the hop generator. After the hop update is performed as shown in FIGS. 10A and 10B, a preamble A pattern will be transmitted in the RAU and a preamble A pattern will be received in the MST. The PPF toggle toggles the PPF when a preamble B pattern is detected after a hop update is made, and this preamble pattern can be detected even in a traffic state. When the current hop frequency is generated using the user TOD input initially, it calculates from 0: 0: 0 seconds to generate the current hop to synchronize and performs based on the RAU preamble pattern after synchronization. After enabling the PPF flag after the preamble B pattern is detected, the MST polls whether the hop update has been continuously performed on the PPF flag. After the hop update is made, the next hop frequency at this time is generated and written to the hop generator. As this happens, the TOD value from the RAU is written to the RTC whenever it changes. Whether the current state is a traffic state or an idle state, the PPF flag toggles based on the preamble pattern. There is an ideal time of 2 minutes and 8 seconds to toggle the PPF flag and hop update. The hop update updates both the current control channel and the traffic channel. That is, when the update is made and the next hop frequency is generated, both the control and traffic must be written to the hop generator. In this way, GHS is received every 64 of the MST between RAU / MSTs and 128 or hop update operations are performed. 5 and 8, the operation during initial power-up for the hop update according to the present invention is performed in step 5b by applying power in step 5a in the MST as shown in FIG. 3. When the user inputs an initial value for generation, and inputs it to the service control unit 309 through the digital subscriber unit 307 as shown in FIG. 3, the service control unit 221 of FIG. In the process of (5c) by the control of the hop generator of the current hop pattern is generated. The service controller 221 checks whether the service controller 221 is synchronized with the RAU in step 5d. If it is synchronized with the RAU in step (5d), the next hop pattern is generated and written by the control of the hop generator of the jammer 317 of the service control unit 309 in step (5e), and communicates with the RAU in step (5f). After subscribing for the service control unit 309 enters the idle state. In the idle state of FIG. 5, the control signal packet is received from the RAU for information analysis. The GHS (Global Hop Sync) is performed every 64 seconds (1 minute 4 seconds) and every 128 seconds (2 minutes 8 seconds) from the RAU. Alternatively, hop updates are made every 32 minutes. The hop pattern generator of the jammer 317 of the MST is the main control unit 319 through the duplexer 301, the tuner 313, the demodulator 315, and the front anatomy 317 of the RAU in step 6a. If input to the main control unit 319 checks whether the TOD value, which is the time information about the day, hour, minute from the satellite in the GPS function of the RAU from the received information. If the time has not been updated, it enters the idle state again and if it has been updated, in step 6c, the TOD value is written into its memory and written again for RTC. Subsequently, other control information is recorded in step 6d, and then enters the idle state. The fact that the MST has performed a hop update operation can be known by polling whether the toggled PPF has changed. The PPF is achieved when the current value is set to a toggle value by an enable operation in one of two memories of the MST hop generator. Thus, the fact that the MST did a hop update operation can be known by polling to see if the toggled PPF flag has changed. Looking at the conversion example of the PPF in the hop generator in detail with reference to Figure 7, in step (7a), the service control unit 309 checks whether the PPF toggle value is written to the memory. If it is checked in step (7a), the first and second preamble patterns are detected and correct in step (7b). In step (7b), it is checked whether the setting is correct in step (7c, 7d) to check whether it is correct. In step 7e, the hop data memory of the hop generator is converted into a CMR (Change Mode Register) value. As shown in the example of FIG. 8, the check of the completion of the hop update is performed by polling every 5 ms. In step 8a, the PPF toggle is enabled. If the PPF toggle is not enabled in step (8a), it is checked whether the second preamble pattern is detected in step (8b). If detected, the PPF toggle value is written to the CMR, and the PPF toggle is enabled in step 8f. However, if the toggle is enabled in step (8a), the CMR value of the PPF is read in step (8c), and the process checks whether the PPF flag is equal to the PPF of the CMR in step (8e). When it is the same as the process (8e), the next hop pattern generation and the PPF toggle are disabled in the process (8g), and in the process (8i), the next hop pattern is written to the memory opposite to the current PPF. That is, the present invention calculates the current hop frequency from 0: 0: 0 second when the current hop frequency is generated by using the user's TOD initially input, generates the current hops, synchronizes the synchronization, and then preambles of the RAU. Determine the pattern shape to determine whether to enable the PPF flag. The PPF flag toggle operation in the traffic state is similarly performed based on the preamble pattern. After enabling the PPF flag after the second preamble pattern is detected, the MST polls the PPF flag to see if hop update has been performed. After the hop date is made, the next hop frequency at this time is generated and written to the hop generator. As this happens, the TOD value from the RAU is written to the RTC whenever it changes. Whether the current state is a traffic state or an idle state, the PPF flag toggles based on the preamble pattern. There is an ideal time of 2 minutes and 8 seconds to toggle the PPF flag and hop update. The hop update of updates the current control channel and traffic channel mode. That is, when the hop update is made and the next hop frequency occurs, both control and traffic must be written to the hop generator. In the same manner as described above, the GHS is received between the RAU and the MST every 64 MST and the hop update operation is performed every 128 seconds or 32 minutes.

As described above, in order to allow stable transmission and reception of the most critical control information between the RAU and the MST, the ECCM function is maximized because the flexible and efficient hopping frequency can be updated even for various jams.

Claims (5)

In the hop pattern update method of a frequency hopping system having a radio access unit (RAU) and a plurality of mobile subscriber station (MST), An initialization process of inputting initial power and putting an idle state for the hop update; An information analysis process of receiving a control signal packet from the RAU in the idle state of the initialization process, analyzing the information and placing the information in the idle state; A ping pong flag toggle process of converting a ping pong flag toggle value in a hop generator in an idle state of the information analysis process; Hop pattern update method using a preamble pattern in the frequency hopping system, characterized in that consisting of a hop update completion check process for checking whether the hop update is complete in the ping-pong flag toggle conversion process. The method of claim 1, wherein the initialization process An input process of inputting an initial value of a user, A current hop pattern generation process of generating a current hop pattern in the input process; A synchronization detection process of checking whether a radio access unit (RAU) is synchronized from the hop pattern generated in the current hop pattern generation process; In the frequency hopping system, when the radio access unit (RAU) is synchronized in the synchronization detection process, it is configured to subscribe for the next hop pattern generation and the next hop generation and to subscribe to the radio access unit (RAU). Hop pattern update method using the preamble pattern. The method of claim 1, wherein the information analysis process is A control information receiving process of receiving control information from the radio access unit (RAU); An update checking process of checking whether the TOD (Time Of Day) value is updated from the received information in the control information receiving process; When the TOD value is updated in the update checking process, a hop pattern update method using a preamble pattern in a frequency hopping system, characterized in that the control information storage process stores TOD storage, RTC, and stores other control information. . The method of claim 1, wherein the ping pong flag conversion process is performed. When the ping-pong flag toggle value is written, the first step of detecting the preamble first and second patterns and setting the respective preambles, A second step of checking a state set as a pattern of the corresponding preamble in the first step; And a third step of converting a hop data memory of a hop generator and converting a value of a change mode register (CMR) when the detection of the first and second patterns of the preamble is confirmed in the second step. Hop pattern update method using preamble pattern in. The method of claim 1, wherein the hop update completion check process A first step of confirming whether or not the Ping Flag flag is enabled; A second step of enabling the PPF toggle after writing the PPF toggle value to the CMR if it is determined whether the second pattern preamble is detected when the PPF toggle is not enabled in the first step; A third step of checking whether the PPF flag is equal to the PPF of the CMR by reading the CMR of the PPF when the PPF toggle is enabled in the first and second processes; And a fourth step of disabling the next hop pattern and disabling the PPF toggle when the PPF flag is the same as the PPF of the CMR, and writing the next hop pattern to the memory opposite to the next PPF. Hop pattern update method using preamble pattern in.

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