JP2005167748A - Frequency hopping communication device - Google Patents

Abstract

The present invention provides an FHSS communication apparatus that performs frequency carrier exchange between hopping patterns of two communication slots, can hop only with a frequency carrier having a good communication state in one communication slot, and can avoid interference of interference waves. For the purpose.
An error monitoring means for detecting a reception error in a received signal, a frequency carrier having a good communication state and a frequency carrier having a bad communication state are determined, and a hopping pattern of one communication slot of two communication slots. If a frequency carrier with a poor communication state is detected, a carrier exchange is performed to exchange a frequency carrier with a good communication state in the hopping pattern of the other communication slot with a frequency carrier with a bad communication state in one communication slot. Slot diversity control means 103 to perform.
[Selection] Figure 1

Description

  The present invention relates to a frequency hopping communication apparatus in which a use carrier is switched according to a predetermined hopping pattern.

  The 2.4 GHz band ISM (Industrial Scientific Medical) band (industrial scientific medical band) is a frequency band in which various devices are used and interference is likely to occur. Even when a spread spectrum wireless communication apparatus using a frequency hopping method, which is considered to be relatively resistant to interference, performs communication in this frequency band, a specific frequency carrier (hereinafter also referred to as “carrier”) is subject to interference for a certain period of time. And hopping to the specific carrier at regular intervals, it will be subject to interference.

  As a measure to avoid such radio wave interference, a certain period (frame) is time-divided into a plurality of slots (hereinafter also referred to as “communication slots”), and separate wireless communication is possible for each slot. In the time division multiple access system, a frequency diversity system has been proposed in which the communication frequency (carrier frequency, carrier frequency) is changed for each slot, and the same data is transmitted and received in a plurality of slots (see Patent Document 1). A specific operation will be described below with reference to FIG.

  FIG. 5 is a block diagram showing a conventional example of a frequency hopping communication apparatus as a time division wireless communication apparatus having a frequency diversity communication function.

  As shown in FIG. 5, the conventional time division wireless communication apparatus includes an antenna 501, a duplexer 502, a transmission unit 503, a reception unit 504, a transmission logic unit 505, a reception logic unit 506, and a control unit 507. Switching units 508 and 509 and transmission / reception local oscillators 510-1 to 510 -n controlled by a control signal from the control unit 507, an input terminal 511, and an output terminal 512.

  In FIG. 5, a pair of transmission / reception units including a transmission unit 503 and a reception unit 504 have a function of obtaining a plurality of carrier waves, and one frame is configured by sequentially transmitting a plurality of carrier waves obtained by this function. Each carrier wave in the frame is modulated with the same signal so as to have a frequency diversity effect.

  First, the local oscillation signals of the transmission / reception local oscillators 510-1 to 510-n are sequentially transmitted through the switching units 508 and 509 in accordance with a control signal from the control unit 507 through the switching units 508 and 509 in a predetermined cycle (frame). It is sent to the receiving unit 504. On the other hand, the signal from the input terminal 511 is accumulated in the transmission logic unit 505, and n signals of s1 to sn are sent to the transmission unit 503 in one frame, and the carrier waves of f1 to fn are modulated. When the transmission / reception local oscillator 510-i is connected to the transmission unit 503, the carrier wave fi (1 ≦ i ≦ n) is transmitted from the antenna 501 to the communication partner with the signal si.

Next, the carrier wave from the communication partner received by the antenna 501 is input to the receiving unit 504 through the duplexer 502. In this receiving unit 504, the carrier wave from the communication partner is mixed with the local oscillation signals of the transmission / reception local oscillators 510-1 to 510 -n input via the switching unit 509 controlled by the control unit 507, so It is converted to frequency and demodulated further. This signal is input to the reception logic unit 506, an appropriate logical operation is performed, the frame configuration is solved, and it is sent to the output terminal 512.

  Here, if the signals s1 to sn in the frame are all the same, a signal with higher reliability can be selected and output by logically comparing the signals s1 to sn at the time of reception.

  In mobile communication, this time division multiple access method is used as one-to-many (for example, a base station and a plurality of mobile communication devices, or a master unit and a plurality of wireless slave units), One communication often uses one slot for transmission and reception, and when frequency diversity is used for one-to-one communication, a method of selecting data with no error using two slots (hereinafter referred to as “slot diversity”). Is often adopted.

If this slot diversity is used in a frequency hopping communication device (hereinafter referred to as “FHSS communication device”), even if a specific frequency carrier receives interference from an interference wave, communication is performed using different carriers at the same time. A decrease in speed can be avoided.
Japanese Patent Publication No. 7-28248

  However, even if communication is performed using different carriers, it is possible that reception errors may occur in both communication slots due to interference of interference waves at the same time. Also, the use of two communication slots increases the effect on other wireless devices, and requires twice as much power consumption.

  In this FHSS communication apparatus, frequency carrier exchange is performed between hopping patterns of two communication slots, and in one communication slot, hopping can be performed only with a frequency carrier having a good communication state, and interference of interference waves can be avoided. Is required.

  In order to satisfy this requirement, the present invention performs frequency carrier exchange between hopping patterns of two communication slots, and can hop only with a frequency carrier having a good communication state in one communication slot, thereby avoiding interference of interference waves. An object of the present invention is to provide an FHSS communication apparatus that can perform the above-described operation.

  In order to achieve this object, the FHSS communication apparatus of the present invention is a frequency hopping communication apparatus that performs frequency diversity communication in two communication slots, and has good communication status with error monitoring means for detecting a reception error in a received signal. When a frequency carrier and a frequency carrier with a bad communication state are determined and a frequency carrier with a bad communication state is detected in the hopping pattern of one of the two communication slots, the hopping pattern of the other communication slot is detected. And a slot diversity control means for exchanging a carrier for exchanging a frequency carrier having a good communication state and a frequency carrier having a bad communication state of one communication slot.

  Thereby, frequency carrier exchange is performed between hopping patterns of two communication slots, and in one communication slot, hopping can be performed only with a frequency carrier having a good communication state, and interference of interference waves can be avoided. Is obtained.

The FHSS communication apparatus of the present invention is a frequency hopping communication apparatus that performs frequency diversity communication in two communication slots, and includes error monitoring means for detecting a reception error in a received signal, a frequency carrier having a good communication state, and a poor communication state. When a frequency carrier having a bad communication state is detected in the hopping pattern of one communication slot of the two communication slots while determining with the frequency carrier, the communication state in the hopping pattern of the other communication slot is good. By having a slot diversity control means for exchanging a frequency carrier and a frequency carrier having a poor communication state in one communication slot, communication is performed while always hopping a frequency carrier in a good communication state in one communication slot. Can be disturbed Advantageous effect that it is possible to avoid the interference of the waves is obtained.

  Further, the slot diversity control means has an advantageous effect that the power consumption of the FHSS communication device can be suppressed by reducing the transmission output in the other communication slot in which the frequency carrier having a bad communication state exists after carrier exchange. It is done.

  Furthermore, it has an electric field strength measuring means for measuring the electric field strength of the received signal of each frequency carrier in the other communication slot, and a hopping pattern table for storing the electric field strength, and the slot diversity control means stores the electric field strength in the hopping pattern table. By performing carrier exchange based on the electric field strength, there is an advantageous effect that carrier exchange can be continuously performed in response to a wireless environment that changes during communication.

  Further, a frequency hopping communication device that performs frequency diversity communication in two communication slots, a storage unit that stores carrier exchange information at the end of the previous communication, and a wireless communication link established in the two communication slots Based on the carrier exchange information stored in the storage unit, the slot diversity control means for exchanging all carriers at once so that the two communication slots have the same hopping pattern as at the end of the previous communication. An advantageous effect is obtained that a frequency carrier that has caused a reception error can be avoided in advance at the start of communication.

  Further, a frequency hopping communication apparatus for performing frequency diversity communication in two communication slots, wherein reception control means for receiving all frequency carriers during standby without communication, and interference of all frequency carriers received by the reception control means Electric field strength measuring means for measuring the electric field strength of the wave, a storage unit storing the measured electric field strength of the interfering wave of all frequency carriers, and the total frequency depending on the magnitude of the electric field strength of the interfering wave of all frequency carriers stored in the storage unit. Dividing the carrier into half a large field strength frequency carrier and a small field strength frequency carrier, when a wireless communication link is established in two communication slots, one communication slot performs frequency hopping with only the high field strength frequency carrier. The other communication slot performs frequency hopping with only a small electric field strength frequency carrier. By having a slot diversity control means for all carriers exchanged once Migihitsuji, advantageous effect that the start of communication can communicate only with hardly frequency carrier reception error can be obtained.

  An object of the present invention is to perform frequency carrier exchange between hopping patterns of two communication slots and to hop only with a frequency carrier having a good communication state in one communication slot, thereby avoiding interference of interference waves. Is realized by exchanging the frequency carriers used in the hopping pattern of each slot.

A first invention made to solve the above-mentioned problem is a frequency hopping communication device that performs frequency diversity communication in two communication slots, and has an error monitoring means for detecting a reception error in a received signal and a good communication state When a frequency carrier and a frequency carrier with a bad communication state are determined and a frequency carrier with a bad communication state is detected in the hopping pattern of one of the two communication slots, the hopping pattern of the other communication slot is detected. And a slot diversity control means for exchanging a carrier for exchanging a frequency carrier having a good communication state and a frequency carrier having a bad communication state in one communication slot. Hop the frequency carrier with good communication It can be reluctant communication with operations and effects that it is possible to avoid the interference of the interference wave.

  The second invention made in order to solve the above-mentioned problem is that the slot diversity control means drops the transmission output in the other communication slot where the frequency carrier having a bad communication state exists after the carrier exchange, It has the effect | action and effect that the power consumption of a FHSS communication apparatus can be suppressed.

  A third invention made to solve the above-described problems has electric field strength measuring means for measuring the electric field strength of the received signal of each frequency carrier in the other communication slot, and a hopping pattern table for storing the electric field strength. The slot diversity control means performs carrier exchange based on the electric field strength stored in the hopping pattern table, and can continuously carry out carrier exchange corresponding to a wireless environment changing during communication. It has the action and effect.

  A fourth invention made to solve the above problems is a frequency hopping communication apparatus that performs frequency diversity communication in two communication slots, a storage unit that stores carrier exchange information at the end of the previous communication, and 2 When wireless communication links are established in one communication slot, all carrier exchanges are performed at once based on the carrier exchange information stored in the storage unit so that the two communication slots have the same hopping pattern as at the end of the previous communication. The slot diversity control means is provided, and has the effect of being able to avoid in advance the frequency carrier that has actually caused a reception error at the start of communication.

  A fifth invention made to solve the above-mentioned problems is a frequency hopping communication apparatus for performing frequency diversity communication in two communication slots, and receiving control means for receiving all frequency carriers during standby without performing communication. And an electric field strength measuring means for measuring the electric field strength of the jamming wave of all frequency carriers received by the reception control means, a storage unit for storing the measured electric field strength of the jamming wave of all frequency carriers, and all the data stored in the memory unit. When the radio communication link is established in the two communication slots, one of the frequency carriers is divided into a large electric field strength frequency carrier and a small electric field strength frequency carrier which are divided by half according to the magnitude of the electric field strength of the interference wave of the frequency carrier. The communication slot performs frequency hopping with only the high electric field strength frequency carrier, and the other communication slot has a small electric field strength. It is decided to have slot diversity control means that exchanges all carriers at once so that frequency hopping is performed only with wave number carriers, and it is possible to communicate only with frequency carriers that are unlikely to receive errors from the start of communication. Has action and effect.

(Embodiment 1)
FIG. 1 is a block diagram showing an FHSS communication apparatus according to Embodiment 1 of the present invention.

As shown in FIG. 1, the FHSS communication apparatus includes a hopping pattern selection unit 102 that selects one hopping pattern from a plurality of hopping patterns, a slot diversity control unit 103 that controls hopping patterns and communication states of two communication slots, It comprises a master control means 100a, a slave control means 100b, and a wireless unit 101 that manages wireless communication processing. The master control unit 100a includes a transmission control unit 111 that controls data transmission processing, a reception control unit 113 that controls data reception processing, an error monitoring unit 114 that monitors the reception status of data received in the master slot, and a carrier exchange request. Carrier exchange transmission means 115 to be communicated to the communication partner, response confirmation means 112 for confirming a response from the communication partner to the transmitted carrier exchange request, carrier exchange monitoring means 117 for monitoring a carrier exchange request from the communication partner, and a hopping pattern And a hopping pattern table 116 for storing. The slave control unit 100b also includes a transmission control unit 121 that controls data transmission processing, a reception control unit 123 that controls data reception processing, a hopping pattern table 126 that stores hopping patterns, and the electric field strength of each reception carrier in the slave slot. It is comprised from the electric field strength measurement means 128 to measure.

  The operation of the FHSS communication apparatus configured as described above will be described with reference to FIG. FIG. 2 is a flowchart showing a process of exchanging carriers between the master slot and the slave slot during slot diversity communication.

  In FIG. 2, when the reception control means 113 receives data from the communication partner on the frequency carrier N via the wireless unit 101 (S1), the error monitoring means 114 checks whether there is a reception error in the master slot (S2). ). If it is normal reception, the continuous error counter (EC N) is cleared to “0” (S9), and if there is a reception error, the value of the continuous error counter (EC N) is incremented (S3). The slot diversity control means 103 checks whether or not the value of the continuous error counter (EC N) is larger than a threshold value (S4), and if the value is larger than the threshold value, the carrier N determines that the communication state is bad. . In that case, the slot diversity control means 103 searches for a carrier whose continuous error counter value is 0 from the slave slot hopping pattern table 126 (in the hopping pattern table 126, the continuous error counter value is stored for each carrier. To the carrier exchange transmission means 115. The carrier exchange transmission means 115 puts the carrier exchange request identifier and the two frequency carrier numbers to be exchanged in the control field of the transmission data format, and transmits them to the communication partner via the transmission control means 111 and the radio unit 101 (S5). ).

  When the carrier exchange monitoring unit 117 detects reception of the carrier exchange request on the communication partner FHSS communication device side, the carrier exchange request response is transmitted via the transmission control unit 111 and the radio unit 101, and each hopping pattern table 116, 126 is updated.

  On the FHSS communication device communication device side that requested the carrier exchange, upon reception by the reception control unit 113 immediately after the exchange request transmission, the error monitoring unit 114 checks whether there is a reception error in the master slot (S6). If there is an error, the carrier exchange request response of the communication partner cannot be confirmed, so the carrier exchange transmission means 115 transmits the carrier exchange request to the communication partner again via the transmission control means 111 and the wireless unit 101 (S5). . If the reception is normal, the response confirmation unit 112 checks the control field of the received data (S7), and if the carrier exchange request response is confirmed, the response is transmitted to the slot diversity control unit 103, and the slot diversity control unit 103 receives the hopping pattern. The tables 116 and 126 are updated (S8). That is, the carrier is exchanged between the master control unit 100a and the slave control unit 100b. If the carrier exchange request response is not confirmed in step S7, the carrier exchange transmission unit 115 transmits the carrier exchange request again to the communication partner via the transmission control unit 111 and the radio unit 101 (S5).

Next, the transmission control unit 121 reduces the transmission output in the slave slot, and the electric field strength measuring unit 128 measures the electric field strength of the carrier as the electric field strength of the disturbing wave at the time of reception and manages it with the hopping pattern table 126. When carrier exchange progresses and there is no frequency carrier shared between the master slot and the slave slot and a carrier with a poor communication state is detected in the master slot, a carrier with low electric field strength is searched from the hopping pattern table 126 of the slave slot. Replace the carrier.

  As described above, according to the present embodiment, the frequency hopping communication apparatus performs frequency diversity communication in two communication slots, and includes an error monitoring unit 114 that detects a reception error in a received signal, and a frequency carrier that has a good communication state. And when the frequency carrier with the poor communication state is detected in the hopping pattern of one of the two communication slots, the hopping pattern of the other communication slot is detected. By having slot diversity control means 103 for exchanging a carrier with a frequency carrier with a good communication state and a frequency carrier with a bad communication state of one communication slot, a frequency with a good communication state is always in one communication slot. Communication while hopping carriers Rukoto can, it is possible to avoid the interference of the interference wave.

  Furthermore, the slot diversity control means 103 can suppress the power consumption of the FHSS communication apparatus by reducing the transmission output in the other communication slot in which there is a frequency carrier having a poor communication state after carrier exchange.

  Furthermore, it has an electric field strength measuring means 128 that measures the electric field strength of the received signal of each frequency carrier in the other communication slot, and a hopping pattern table 126 that stores the electric field strength, and the slot diversity control means 103 includes the hopping pattern table. By performing carrier exchange based on the electric field strength stored in 126, carrier exchange can be continuously performed in response to a wireless environment that changes during communication.

(Embodiment 2)
FIG. 3 is a block diagram showing an FHSS communication apparatus according to Embodiment 2 of the present invention.

  As shown in FIG. 3, the FHSS communication apparatus includes a storage unit 304 for storing the hopping patterns of the master and slave slots at the end of communication and the slave slot side (slave control means 300b) in the configuration of FIG. ), The same error monitoring means 324, carrier exchange transmission means 325, response confirmation means 322, and carrier exchange monitoring means 327 as those on the master slot side (master control means 300a) are added.

  The operation of the FHSS communication apparatus configured as described above will be described with reference to FIG. FIG. 4 is a flowchart showing processing from the end of communication to the start of communication.

  In FIG. 4, during slot diversity communication (S11), upon receiving a disconnection request (S12), the slot diversity control means 303 stores the hopping pattern of the master slot and the hopping pattern of the slave slot at the end of communication in the storage unit 304. (S13) and the communication is terminated. Next, when a SETUP (setup) request is received (S14), a two-slot radio link of the master slot and the slave slot is established (S15). First, in order to exchange the carrier of the master slot, the carrier exchange transmission of the slave slot is performed. The means 325 places the master slot hopping pattern stored in the storage unit 304 in the data field of the transmission data format, and transmits it to the communication partner via the transmission control unit 321 and the wireless unit 301 (S16).

When the carrier exchange monitoring unit 327 detects the reception of the carrier exchange request on the communication partner FHSS communication device side, the carrier exchange request response is transmitted via the transmission control unit 321 and the radio unit 301, and the slot diversity control unit 303 includes: The master slot hopping pattern is changed (S19).

  On the FHSS communication apparatus side that requested the slot diversity stop, the error monitoring means 324 checks whether there is a reception error at the time of reception by the reception control means 323 immediately after the stop request transmission (S17), and a reception error has occurred. In this case, since the carrier exchange request response of the communication partner cannot be confirmed, the carrier exchange transmission unit 325 transmits the carrier exchange request again to the communication partner via the transmission control unit 321 and the wireless unit 301 (S16). If the reception is normal, the response confirmation unit 322 checks the control field of the received data (S18), and if the carrier exchange request response is confirmed, the response is transmitted to the slot diversity control unit 303, and the slot diversity control unit 303 The slot hopping pattern is changed (S19). If not confirmed, the slot diversity control means 303 once again transmits a carrier change request to the communication partner via the transmission control means 321 and the radio unit 301 (S16).

  Similarly, the hopping pattern of the slave slot is changed using the master slot (S16 to S19).

  Another operation of the FHSS communication apparatus of FIG. 3 will be described. The reception control unit 323 performs reception operation for all carriers in a state where communication is not performed, and the electric field strength measurement unit 328 measures the electric field strength of the interference wave of each carrier and stores it in the storage unit 304 via the slot diversity control unit 303. Store. The slot diversity control means 303 divides all carriers into halves according to the magnitude of the electric field strength based on the information (divided into a large electric field strength frequency carrier and a small electric field strength frequency carrier), and halves the electric field strength at the start of communication. Carrier exchange is performed at a time by using a hopping pattern made up of two carriers (small electric field strength frequency carriers) for the master slot and a hopping pattern made up of a half carrier (large electric field strength frequency carriers) having a large electric field strength for the slave slots.

  As described above, according to the present embodiment, a frequency hopping communication apparatus that performs frequency diversity communication in two communication slots, the storage unit 304 that stores carrier exchange information at the end of the previous communication, and two communication When a wireless communication link is established in the slot, all carriers are exchanged at once based on the carrier exchange information stored in the storage unit 304 so that the two communication slots have the same hopping pattern as at the end of the previous communication. By having the slot diversity control means 303, it is possible to avoid in advance the frequency carrier that has actually caused a reception error at the start of communication.

  Further, a frequency hopping spread spectrum wireless communication apparatus that performs frequency diversity communication in two communication slots, which is received by the reception control means 323 and the reception control means 323 that receive all frequency carriers during standby without communication. Electric field strength measuring means 328 for measuring the electric field strength of the jamming wave of all frequency carriers, a storage unit 304 for storing the measured electric field strength of the jamming wave of all frequency carriers, and the jamming wave of all frequency carriers stored in the memory unit 304 When the radio communication link is established in two communication slots when one carrier slot is divided into a high electric field strength frequency carrier and a small electric field strength frequency carrier, each of which is divided into half. Frequency hopping with only the strong frequency carrier, the other communication slot By having a slot diversity controller 303 which performs at a time all carriers exchange to perform frequency hopping only a small electric field strength frequency carrier can be received error from the start of communication to communicate only with hardly frequency carrier.

In the present invention, the used carrier is switched according to a predetermined hopping pattern.
Regarding the communication device, in the frequency band where the use of various wireless devices is permitted, not only the communication quality of the own wireless device can be kept high, but also the influence on other wireless devices can be reduced.

1 is a block diagram showing an FHSS communication apparatus according to Embodiment 1 of the present invention. Flowchart showing processing for exchanging carriers in the master slot and slave slot during slot diversity communication The block diagram which shows the FHSS communication apparatus by Embodiment 2 of this invention A flowchart showing processing from the end of communication to the start of communication A block diagram showing a conventional example of a frequency hopping communication device as a time division wireless communication device having a frequency diversity communication function

Explanation of symbols

101, 301 Radio section 102, 302 Hopping pattern selection means 103, 303 Slot diversity control means 111, 121, 311, 321 Transmission control means 112, 312, 322 Response confirmation means 113, 123, 313, 323 Reception control means 114, 314 324 Error monitoring means 115, 315, 325 Carrier exchange transmission means 116, 126, 316, 326 Hopping pattern table 117, 317, 327 Carrier exchange monitoring means 128, 328 Electric field strength measuring means 100a, 300a Master control means 100b, 300b Slave Control means

Claims (5)

A frequency hopping communication device that performs frequency diversity communication in two communication slots,
Error monitoring means for detecting a reception error in a received signal, determination of a frequency carrier having a good communication state and a frequency carrier having a bad communication state, and a communication state within a hopping pattern of one of the two communication slots Slot diversity in which carrier exchange is performed for exchanging a frequency carrier having a good communication state in the hopping pattern of the other communication slot with a frequency carrier having a bad communication state in the one communication slot when a bad frequency carrier is detected And a frequency hopping communication apparatus. The frequency hopping communication apparatus according to claim 1, wherein the slot diversity control means drops the transmission output in the other communication slot in which the frequency carrier having the poor communication state exists after the carrier exchange. Electric field strength measuring means for measuring the electric field strength of the received signal of each frequency carrier in the other communication slot; and a hopping pattern table for storing the electric field strength, wherein the slot diversity control means includes the hopping pattern table. 3. The frequency hopping communication apparatus according to claim 2, wherein the carrier exchange is performed based on the stored electric field strength. A frequency hopping communication device that performs frequency diversity communication in two communication slots,
A storage unit that stores carrier exchange information at the end of the previous communication, and the two communication slots based on the carrier exchange information stored in the storage unit when a wireless communication link is established in the two communication slots. A frequency diversity hopping communication apparatus comprising slot diversity control means for exchanging all carriers at once so that the same hopping pattern as that at the end of the previous communication is obtained. A frequency hopping communication device that performs frequency diversity communication in two communication slots,
Reception control means for receiving all frequency carriers during standby when communication is not performed, electric field strength measuring means for measuring the electric field strength of interference waves of all frequency carriers received by the reception control means, and the measured all frequency carriers A storage unit for storing the electric field strength of the interference wave, and a large electric field strength frequency carrier and a small electric field strength frequency carrier in which all the frequency carriers are halved by the magnitude of the electric field strength of the interference wave of the all frequency carriers stored in the storage unit. When the wireless communication link is established in the two communication slots, the one communication slot performs frequency hopping only with the large electric field strength frequency carrier, and the other communication slot performs the small electric field strength frequency. Slot diversity where all carriers are exchanged at once so that frequency hopping is performed only by carriers. Frequency hopping communication apparatus characterized by a control unit.

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