Classifications

• • H—ELECTRICITY
  • H04—ELECTRIC COMMUNICATION TECHNIQUE
  • H04W—WIRELESS COMMUNICATION NETWORKS
  • H04W84/00—Network topologies
  • H04W84/02—Hierarchically pre-organised networks, e.g. paging networks, cellular networks, WLAN [Wireless Local Area Network] or WLL [Wireless Local Loop]
  • H04W84/04—Large scale networks; Deep hierarchical networks
  • H04W84/08—Trunked mobile radio systems
• • H—ELECTRICITY
  • H04—ELECTRIC COMMUNICATION TECHNIQUE
  • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
  • H04L27/00—Modulated-carrier systems
  • H04L27/10—Frequency-modulated carrier systems, i.e. using frequency-shift keying
  • H04L27/12—Modulator circuits; Transmitter circuits

Definitions

• the present invention relates to a wireless communication control device and a wireless communication method.
• the bandwidth of the communication channel used by the radio equipment is being narrowed.
• a wireless device that is obligated to provide one communication channel at 6.25 kHz from 2005 according to par 190 of the Code of Federal Regulation (CFR) 47 regulated by the Federal Communications Commision (FCC) in the United States. Wireless devices that do not satisfy this condition will not be able to receive type approval after 2005 and will not be able to be sold in the United States.
• CFR Code of Federal Regulation
• FCC Federal Communications Commision
• the modulation spectrum at the transmitter must be within the range of the transmission spectrum mask called “Mask E” as shown in Figure 7. Is required.
• the restrictions by the transmission spectrum mask specified by this rMask E are, for example, that the transmission spectrum is less than 30 dB at a frequency of ⁇ 3 kHz away from the carrier wave (center frequency), and the transmission output is 1
• it In the case of a wireless device of 0 W or more, it must be less than 165 dB at a frequency of ⁇ 4.6 kHz away from the carrier wave.
• the transmission spectrum In the region between ⁇ 3 kHz and ⁇ 4.6 kHz from the carrier wave, the transmission spectrum is ⁇ 3 kHz. It is below the straight line passing through -55dB at 30dB and ⁇ 4.5kHz.
• a predetermined number of radio channels are shared by a plurality of radio devices serving as mobile radio stations. Can improve the efficiency of use. And even in a wireless communication system that transmits and receives quaternary FSK signals, it is possible to adopt the trunk method, and together with the above FCC rules, it can be expected that the frequency utilization efficiency will be improved compared to the conventional one.
• FIG. 8 is a diagram showing an example of a spectrum distribution in a four-value FSFS signal matched with a transmission spectrum mask of “Mask ⁇ ”. As shown in Fig. 8, it is possible to match the four-valued FS signal with the mask spectrum of “Mask E” in a given experimental environment. Referring to Figure 8, the power level in the adjacent channel detuned by 6.25 kHz Is at the level of the noise floor. From this point, it seems that the leakage power to the adjacent channel is sufficiently suppressed. Disclosure of the invention
• FSK modulation unlike amplitude modulation (AM), has non-linear characteristics, so the transmission spectrum is more likely to spread than amplitude modulation. .
• bandwidth of the filter BPF: Band Pass Filter
• ⁇ Spectral components existing up to the range of 8.25 kHz can affect the leakage power to the adjacent channel.
• the existence of frequency components in the quaternary FSK signal is observed beyond the range of ⁇ 4.25kHz centered on the transmission frequency. For this reason, the interference level to the adjacent channel in the wireless device operating in the 6.25 kHz band becomes larger than the interference level to the adjacent channel in the wireless device operating in the conventional 12.5 kHz bandwidth. It will be.
• a trunk-type wireless communication system when a plurality of wireless channels are set as either control channels or speech channels, some signal is always transmitted from the base station on the control channel to control the line. May be.
• location registration and call control are performed by receiving signals that are constantly transmitted from the base station on the control channel.
• the call channel is activated and transmitted / received only when allocation to the mobile radio station is performed by the line control device installed in the base station, the idle channel is unused. No signal is transmitted in the state. For this reason, the radio frequency band adjacent to the call channel is relatively less affected by the signals transmitted and received on the call channel.
• the frequency band adjacent to the control channel can be used as a communication channel in the same wireless communication system, or another wireless communication system.
• the frequency band adjacent to the control channel there is a risk of interference during the signal transmission period on the control channel.
• the radio frequency band adjacent to the control channel there is a problem that the degree of influence by the signals transmitted and received on the control channel becomes large.
• the present invention has been made in view of the above circumstances, and an object of the present invention is to provide a radio communication control device and a radio communication method that can be adapted to narrowing of a communication path and reduce the influence on adjacent channels. And Means for solving the problem
• a radio communication control apparatus according to the first aspect of the present invention provides:
• a wireless communication control device that controls wireless communication using a control channel and a plurality of communication channels that can be assigned to any of a plurality of wireless communication devices specified by information transmitted on the control channel.
• Transmission data generating means for generating transmission data having a frame structure having at least three areas of a synchronization word, channel identification information, and control information;
• a modulated wave signal corresponding to the transmission data generated by the transmission data generation means is generated, and the plurality of non-transmission signals are transmitted on one control channel.
• the transmission data generation means does not use the control information area included in the frame structure information for transmission of the control message, it is included in the channel identification information area in the same frame as the control information area.
• the function channel identification information non-modulation identification data that specifies that the control information area is unmodulated can be specified.
• the transmitting means may transmit an unmodulated carrier signal in response to an area of control information in a frame in which unmodulated identification data is set by the transmission data generating means.
• the transmission data generation unit may include a determination unit that determines that the area of the control information is not used for transmission of the control message when there is no message that needs to be notified to the wireless communication device. .
• the transmission data generation means arranges an area of random access control information indicating whether transmission of random access is permitted or prohibited as a transmission data of the frame structure at a position subsequent to the area of control information. Generate transmission data,
• the transmission means may resume the transmission of the modulated wave signal in response to the area of the random access control information when transmitting an unmodulated carrier signal corresponding to the area of the control information.
• a radio communication control apparatus provides a plurality of communication channels that can be assigned to any one of a control channel and a plurality of radio communication apparatuses specified by information transmitted on the control channel.
• a transmission data generation means for generating transmission data having a frame structure having at least three areas of a synchronization word, channel identification information, and control information;
• a modulated wave signal subjected to 4-level FSK modulation corresponding to the transmission data generated by the transmission data generation means is transmitted to at least one of the plurality of wireless communication devices on one control channel. And transmitting means for transmitting
• the transmission means When the transmission means does not use the control information area included in the transmission data generated by the transmission data generation means for transmission of the control message, the transmission means corresponds to the area of the control information in accordance with the quaternary symposium.
• a modulated wave signal that is alternately subjected to FSK modulation corresponding to a binary symbol whose deviation from the carrier frequency is small.
• a wireless communication method is:
• Wireless communication by a wireless communication control device that controls wireless communication using a control channel and a plurality of call channels that can be assigned to any of a plurality of wireless communication devices specified by information transmitted on the control channel A communication method
• a transmission data generation step for generating transmission data having a frame structure having at least three areas of synchronization word, channel identification information, and control information; When the control information area included in the transmission data is not used for transmission of the control message, the control information area is used as the function channel identification information included in the channel identification information area in the same frame as the control information area.
• a non-modulation identification data setting step for setting non-modulation identification data for instructing that it is possible to specify that no modulation occurs.
• a modulated wave signal corresponding to the transmission data is generated, and the plurality of radios are transmitted on one control channel.
• a wireless communication method is:
• Radio communication control apparatus for controlling radio communication using a control channel and a plurality of call channels that can be assigned to any of a plurality of radio communication apparatuses specified by information transmitted on the control channel
• a wireless communication method according to
• a modulated wave signal subjected to 4-level FSK modulation corresponding to the transmission data generated in the transmission data generation step is sent to at least one of the plurality of radio communication apparatuses on one control channel. And a transmission step for transmitting T / JP2005 / 017562
• the transmission step corresponds to the control information area and has a four-valued value. Including a step of transmitting a modulated wave signal alternately subjected to FSK modulation corresponding to a binary symbol having a small deviation from the carrier frequency among the symbols.
• FIG. 1 is a diagram showing a configuration example of a radio communication system to which a line control apparatus according to an embodiment of the present invention is applied.
• FIG. 2 is a diagram illustrating a frame structure of transmission data generated by the frame data processing unit.
• FIG. 3 is a flowchart showing an example of control channel communication processing.
• FIG. 4 is a diagram for explaining an example of a specific operation in the line control apparatus.
• FIG. 5 is a diagram for explaining an example of a specific operation in the line control apparatus.
• FIG. 6 is a diagram illustrating a frame structure of transmission data in a modification of the present invention.
• FIG. 7 is a diagram showing a transmission spectrum mask defined by “Mask E”.
• FIG. 8 is a diagram showing an example of a spectrum distribution in a four-value FSK signal matched with the transmission spectrum mask shown in FIG.
• the invention's effect According to the present invention, it is possible to reduce the influence on the adjacent channel in conformity with the narrowing of the communication path.
• This line control device 1001 is applied to, for example, a wireless communication system 100 as shown in FIG. 1, and is a mobile transmission / reception device as at least one (generally a plurality of) mobile radio stations. Wireless communication with 1 0 2 In Figure 1, as an example,
• the wireless communication system 1 0 0 includes a plurality of mobile transmission / reception devices 1
• Any trunk wireless communication system may be used as long as the wireless communication is performed by transmitting and receiving a radio frequency (RF) signal to and from a radio base station by sharing a predetermined number of radio channels.
• RF radio frequency
• Each mobile transmission / reception device 1 0 2 communicates with other communication terminal devices connected to other mobile transmission / reception devices 1 0 2 and 1 0 1 via RF links and line control devices 1 0 1. Allows voice calls (conversations).
• the line controller 1 0 1 manages a plurality of radio channels deployed by being divided into a plurality of frequency bands, and performs radio channel control for performing radio channel allocation control for each mobile transceiver 1 0 2 It has a function as a device.
• the line control device 1 0 1 can assign a plurality of radio channels to a control channel and one of the mobile transmission / reception devices 1 0 2 specified by the information transmitted on the control channel.
• a wireless communication service such as a voice call to each mobile transceiver 100. As shown in Fig.
• the line controller 1 0 1 includes a receiving antenna 1 1, a 'transmitting antenna 1 2, a reception processing circuit 1 3, an FSK demodulator 1 4, and a frame data processing unit. 1, FSK modulator 1 6, transmission processing circuit 1 7, and operation control unit 1 8.
• the reception antenna 1 1 and the transmission antenna 1 2 may be configured separately, or the reception antenna 1 1 and the transmission antenna 1 2 can be switched by switching the same configuration with a switch circuit or the like. It may function as either of these.
• the reception processing circuit 13 is composed of, for example, an LNA (Low Noise Amplifier), a down converter, a BPF (Band Pass Filter), etc., and among the RF signals received by the receiving antenna 11, each radio channel The frequency component corresponding to is extracted and converted to a demodulated signal.
• the output signal from the reception processing circuit 13 is sent to the FSK demodulator 14.
• the FSK demodulator 14 is composed of, for example, a frequency discriminating circuit, a frequency voltage converting circuit, a zero-crossing digital demodulating circuit using an A / D converter, and the like. Based on this, the received data is demodulated and supplied to the frame data processing unit 15 and the operation control unit 18.
• the frame data processing unit 15 is composed of, for example, a DSP (Digital Signal Processor) and a processor suitable for digital data processing, such as a reception signal processing circuit 13 and operation control.
• DSP Digital Signal Processor
• a processor suitable for digital data processing such as a reception signal processing circuit 13 and operation control.
• transmission data having a predetermined frame structure is generated as data transmitted on the control channel among a plurality of radio channels.
• FIGS. 2 () and (2) are diagrams illustrating the frame structure of transmission data generated by the frame data processing unit 15. As shown in FIG. 2 ( ⁇ ), one frame of transmission data includes an area of synchronization word 3 1, an area of channel identification information 3 2, and an area of control information 3 3.
• the synchronization word 3 1 is used for synchronization processing for establishing synchronization in the wireless communication between the line control device 1 0 1 and each mobile transmission / reception device 1 0 2.
• the synchronization word 3 1 has a predetermined code pattern.
• the channel identification information 32 is used to identify the radio channel and function channel in each mobile transceiver 10 2.
• the area of the channel identification information 3 2 includes an area of the radio channel identification information 3 2 ⁇ and an area of the functional channel identification information 3 2 B, as shown in FIG.
• the control information 33 indicates a notification message, a call message, or another communication control message.
• control information 33 When the control information 33 is a broadcast message, it includes information unique to the radio communication system 100, information indicating the structure of the control channel used for control among the radio channels, and the like.
• the line control device 1 0 1 sends the mobile transmission / reception device 1 0 2 to the mobile transmission / reception device 1 0 2 in response to the mobile transmission / reception device 1 0 2 receiving a call from the calling communication terminal device.
• the frame data processing unit 15 enables transmission of an unmodulated carrier signal from the line control device 101 in response to the area of the control information 33.
• the frame data processing unit 1 5 does not modulate from the line control device 1 0 1 in the control information 3 3 area.
• Set the non-modulation setting data to output the carrier wave signal.
• the non-modulation setting data does not have a specific meaning for the mobile transceiver 100. That is, when the control information 33 is non-modulation setting data, the area of the control information 33 is synonymous with the unused state for the mobile transmission / reception device 100, and a control message used for line control. Is not transmitted.
• the radio channel identification information 3 2 A shown in FIG. 2 (B) indicates that the radio channel transmitting the radio channel identification information 3 2 A is a control channel as a control radio channel, It shows whether the call channel is a radio channel.
• Functional channel identification information 3 2 B indicates the type of control information 33 transmitted in the same frame.
• the function channel identification information 3 2 B indicates that the information transmitted in the area of the control information 33 after the area of the channel identification information 32 is either a notification message, a paging message, or another message. Is shown.
• the frame data processing unit 15 can specify that the control information 33 is non-modulation setting data when non-modulation setting data is set in the area of the control information 33.
• FSK modulation ⁇ 16 is composed of, for example, a PLL (Phase Locked Loop) circuit including a voltage controlled oscillator and a reference oscillator, a DDS (Direct Digital Synthesizer), or a quadrature modulation circuit. Based on the transmission data from 5, a modulated signal with frequency shift keying (FSK) modulation is generated.
• the FSK modulator 16 is also used as an unmodulated carrier signal, for example, by stopping the FSK modulation operation when the transmission data from the frame data processing unit 15 is unmodulated setting data. Generate unmodulated waves.
• Output signals from the FSK modulator 16, such as the modulated wave signal generated by the FSK modulator 16 and the unmodulated carrier wave signal, are sent to the transmission processing circuit 17.
• the transmission processing circuit 17 includes, for example, an up-converter, a power amplifier, and the like, generates an RF signal in a band corresponding to each radio channel based on an output signal from the FSK modulator 16, and transmits the transmission antenna 1 Supply to 2.
• the transmission processing circuit 17 is configured to transmit a modulated wave signal or an unmodulated carrier signal that has been subjected to four-level FSK modulation by the FSK modulator 16 in a radio frequency band corresponding to a radio channel. 1 Send output from 2.
• the operation control unit 18 is composed of, for example, a CPU (Central Processing Unit) and the like, and is for controlling the operation of each part in the line control device 101.
• a CPU Central Processing Unit
• Each mobile transmission / reception device 10 2 is configured to include, for example, an antenna, a communication processing circuit, a voice processing circuit, an operation control circuit, and the like, and performs RF communication with the line control device 1 0 1 installed in the radio base station. By transmitting and receiving signals, wireless communication services such as individual calls, group calls, voice calls, etc. Various processes for providing the service to the user are executed.
• FIG. 3 is a flowchart showing an example of a control channel communication process executed by the line control device 1 0 1.
• the control channel communication process shown in FIG. 3 is performed when the mobile transmission / reception device 1 0 2 performs wireless communication with the line control device 1 0 1 on the control channel. This is a process for transmitting various types of information related to line control to the mobile transmission / reception device 1 0 2. Is done.
• the line control device 1 0 1 When the control channel communication process shown in FIG. 3 is started, the line control device 1 0 1 first performs an initial setting to use one of the radio channels as a control channel, for example, update of channel assignment (step) S 1 0 1).
• the line control device 1001 may be able to dynamically select and use any one of a plurality of radio channels managed by itself as a control channel. In this case, the control channel can be reassigned by updating the channel assignment.
• the operation control unit 18 has a frame structure shown in FIGS. 2 (A) and 2 (B).
• the information to be transmitted (message) that is to be incorporated into the area of the control information 33 is identified on the side of the line control device 101 (step S 100 2).
• step S 1 0 3 When it is determined in step S 1 0 3 that the transmission target information exists (step S 1 0 3; Y es), the transmission target information is sent to the mobile transmitting / receiving device 1 0 2. It is determined whether or not the message is not required to be notified (step S 1 0 4).
• the determination as to whether the transmission target information is a message that needs to be notified to the mobile transmission / reception apparatus 100 2 may be performed based on the specifications of the wireless communication system 100. .
• step S 1 0 3 When it is determined in step S 1 0 3 that the transmission target information does not exist (step S 1 0 3; No), the message that notification is unnecessary in step S 1 0 4
• the operation control unit 1 8 controls the control information 3 3.
• the frame data processing unit 15 changes the control data 33 area to non-modulation setting data.
• Step S 10 6 the information transmitted in the area of the functional channel identification information 3 2 B in the same frame is set to the non-modulation identification information (step S 10 6).
• step S 1 0 4 When it is determined in step S 1 0 4 that the message needs to be notified to the mobile transmitting / receiving apparatus 1 0 2 (step S 1 0 4; No), the frame data processing unit 1 5 For example, under the control of the operation control unit 1 8, the transmission target information specified in step S 1 0 2 is set in the control information 33 area, and the function channel identification information 3 2 B area in the same frame is set. Set the information to be transmitted according to the contents of the information to be sent set in the area of control information 33. (Step S 1 0 7).
• the area of the functional channel identification information 3 2 B is set on the mobile transmitting / receiving device 10 2 side.
• the frame containing the call message can be specified. That is, the mobile transmission / reception device 10 2 can identify the frame including the call message without reading the area of the control information 33.
• the transmission data generated by the frame data processing unit 15 in this way is sent to the FSK modulator 16.
• the FSK modulator 16 sets the FSK modulation operation based on the transmission data from the frame overnight processing unit 15 (step S 10 8).
• the FSK modulator 16 stops, for example, the FSK modulation operation during the period corresponding to the length of the non-modulation setting data. For example, an unmodulated carrier signal is generated.
• the transmission data contains control information other than the synchronization word, channel identification information, or non-modulation setting data
• the transmission data received by the FSK modulator 16 from the frame data processing unit 15 is included. Corresponding FSK modulation operation is performed.
• a 4-level FSK signal is generated in the radio frequency band corresponding to the control channel.
• the FSK modulator 16 is not limited to generating a quaternary FSK signal in the radio frequency band, and may generate a signal in a predetermined intermediate frequency (IF) band. Good.
• the modulated wave signal in the radio frequency band (or intermediate frequency band) generated by the FSK modulator 16 in this way is sent to the transmission processing circuit 17.
• the transmission processing circuit 17 has a frequency of the signal sent from the FSK modulator 16. The number is converted to the control channel band (up-conversion), signal amplification, etc. is applied to the transmitting antenna 1 2, so that RF is transmitted from the line controller 1 0 1 to the outside. Output a signal (step S 1 0 9).
• the line control device 10 1 determines whether or not to change the setting related to the control channel (step S 1 1 0). For example, when using a radio channel that was used as a control channel as a call channel, or when reassigning a radio channel that was used as a call channel to a control channel, change the settings related to the control channel. There is a need to.
• step S 1 1 0 When it is determined in step S 1 1 0 that the setting related to the control channel is to be changed, the control channel communication process shown in FIG. 3 is terminated, and the control channel prepared in advance is changed to change the setting related to the control channel. Start executing the process. On the other hand, when it is determined in step S 1 1 0 that the setting related to the control channel is not changed, the process returns to step S 1 0 2 to transmit information in the next frame. For this reason, the processing for this is continued. It should be noted that the processing from step S 1 0 2 to step S 1 0 8 does not have to be performed by selecting and executing only one of the processings sequentially, and each part of the line control device 1 0 1 performs processing. By sharing this, multiple processes may be executed in parallel.
• FIG. 4 (A) is a timing diagram showing the transmission timing of transmission data having a frame structure that is transmitted from the line control device 100 to the mobile transmitting / receiving device 102 on the control channel.
• Fig. 4 (B) shows the frequency bandwidth of the control channel 10 0 1 in the control channel. (This is a timing diagram showing the modulation state of the RF signal output from the iron.)
• the line control device 101 starts the transmission for the transmission data included in the first frame at the evening T 1.
• the frame data processing unit 15 in the line controller 1 0 1 transmits the function channel identification information 3 2 B included in the area of the channel identification information 3 2 and the notification message in the area of the control information 3 3.
• the transmission data constituting the first frame generated in this way is sent from the frame data processing unit 15 to the FSK modulator 16.
• the FSK modulator 16 performs the FSK modulation operation corresponding to the transmission data from the frame data processing unit 15 to transmit the modulated wave signal subjected to the 4-level FSK modulation to the transmission processing circuit 17. Output.
• the FSK modulator 16 is set with a notification message different from the non-modulation setting data in the area of the control information 33, the period after the timing T2 corresponding to the area of the control information 33 Also, the FSK modulation operation is continued.
• the transmission processing circuit 17 performs power amplification etc. on the modulated wave signal subjected to the 4-level FSK modulation, and the line controller 1 0 1 Output.
• the line control apparatus 100 starts transmission of information included in the second frame at the evening time T 3.
• the In this second frame for example, there is a valid message to be transmitted such as an alert message in the process of step S 1 0 3 shown in FIG. It is assumed that it is determined not to be performed (step S 1 0 3; No or step S 1 0 4; Y es). Therefore, in the line control apparatus 101, the process of step S1105 shown in FIG. 3 is executed, so that the area of the control information 33 in the second frame is set to the non-modulation setting range. Evening is set.
• the function channel identification information 3 2 B included in the same frame is set as non-modulation identification data by executing the processing of step S 10 06 shown in FIG.
• the transmission data contained in the second frame generated in this way is sent from the frame data processing unit 15 to the FSK modulator 16.
• the frame data processing unit 15 has the area channel of the synchronization word 3 1 included in the second frame in the period up to the timing T 4.
• a rectangular wave signal having four signal levels is output to the FSK modulator 16 as a quaternary symbol data string.
• the FSK modulator 16 performs the FSK modulation operation corresponding to the transmission data from the frame data processing unit 15 during the period up to the timing T 4, so that the four-level FSK modulated target is received.
• the modulated wave signal is output to the transmission processing circuit 17.
• the transmission processing circuit 17 sends the modulated wave signal subjected to the 4-level FSK modulation to the line control device 1 0 1 during the period up to the timing T 4. Output from.
• the area of the control information 33 is sent from the frame data processing unit 15 to the FSK modulator 16.
• the frame data processing unit 15 outputs a zero-level transmission data signal as non-modulation setting data, for example, as shown in FIG. 5 (A).
• the FSK modulator 16 responds that the transmission data signal output from the frame data processing unit 15 is at a zero level in the period from timing T 4 to timing T 5, for example, FSK By stopping the modulation operation, for example, as shown in FIG. 5 (B), an unmodulated carrier signal is output from the line control device 101 by the transmission processing circuit 17.
• the mobile transmission / reception device 10 2 has the unmodulated identification data set in the area of the function channel identification information 3 2 B included in the second frame.
• the period output from 1 can be specified.
• the mobile transmission / reception device 100 cannot perform synchronization processing such as clock recovery, and the reception operation becomes unstable. It is possible to become. Therefore, by making it possible to specify the non-modulation period in the mobile transmission / reception apparatus 100 by using the non-modulation identification data, the reception operation can be prevented from becoming unstable.
• control information 3 3 In the period during which the area is transmitted, the execution of the synchronization process is interrupted, and for example, the demodulator circuit is operated at free-running frequency (free-running). It is said Unstable operation in area 3 of control information 3 can be avoided.
• the line control device 101 starts transmission of information included in the third frame as shown in FIG. 4 (A).
• this third frame it is determined that there is no message to be transmitted in the process of step S 1 0 3 shown in FIG. 3 following the second frame (step S 1 0 3; No) ), Or alternatively, it is determined that the message does not need to be notified to the mobile transmitting / receiving apparatus 10 2 in the process of step S 1 0 4 (step S 1 0 4; Y es).
• non-modulation setting data is set in the area of the control information 33 in the third frame in the same way as when the second frame is transmitted.
• functional channel identification information 3 2 B included in the same frame is set as non-modulation identification data.
• a four-value symbol sequence is sent from the frame data processing unit 15;
• the FSK modulator 16 transmits the 4-level FSK from the line controller 1 0 1 by the transmission processing circuit 17 in the period after the timing T 5, for example, as shown in FIG. 5 (B).
• a modulated wave signal with modulation is output.
• the area of control information 33 in the transmission data included in the third frame is transferred from the frame data processing unit 15 to the FSK modulator 16. Sent. At this time, the frame data processing unit 15 and the FSK modulator 16 operate in the same manner as the period from the timing T 4 to the timing T 5, so that the line control device 101 has a non-modulated carrier. A transmission signal is output.
• the present invention when transmitting a transmission data having a frame structure as shown in FIG. 2 on the control channel, when there is no message to be transmitted, When the message does not need to be notified to the transmitter / receiver 1 0 2, an unmodulated wave is generated by the FSK modulator 1 6 in the area of the control information 3 3, and no modulation is performed from the line controller 1 0 1.
• Carrier wave signal is output.
• the unmodulated carrier signal contains only the frequency component corresponding to the center frequency of the control channel, and the spectrum of the transmission signal shows only a slight spread. Therefore, the RF signal, which is significantly narrower than the modulated wave signal subjected to 4-level FSK modulation, is output, and the influence on adjacent channels can be reduced.
• the interference level to the adjacent channel is normally set corresponding to the control message other than the non-modulation setting data set in the control information 33 area and the transmission data other than the control information 33 area.
• This is the average of the time width for outputting a modulated wave signal subjected to 4-level FSK modulation and the time width for outputting an unmodulated carrier signal corresponding to the non-modulation setting data.
• the control information 33 on the side of the line control device 10 1 is obtained.
• the number of messages to be notified to the mobile transmitting / receiving device 1 0 2 at the rear is reduced. Therefore, the interference level to the adjacent channel can be reduced, and the influence on the adjacent channel can be reduced in conformity with the narrowing of the communication path.
• non-modulation setting data is set in the area of control information 33.
• functional channel identification information 3 2 B in the same frame is set as non-modulation identification data.
• the present invention is not limited to the above embodiment, and various modifications and applications are possible. That is, in the above embodiment, when there is no message that needs to be notified to the mobile transmitting / receiving device 10 0 2, it is assumed that an unmodulated carrier wave signal is output corresponding to the area of the control information 33. Although described, the present invention is not limited to this, and other methods capable of reducing the influence on the adjacent channel can be adopted.
• the control information 3 3 included in the frame for which there is no message that needs to be notified to the mobile transmission / reception device 1 0 2 there are four (for example, Of the symbols (signs) of 1 3, 1 1, + 1, + 3), two symbols with a small modulation degree, that is, two with a small deviation from the carrier frequency (center frequency of the control channel) (for example, — It is also possible to output a modulated wave signal that has been subjected to binary FSK modulation using only the symbols 1 and +1).
• the frame data processing unit 15 needs to notify the mobile transmission / reception device 102, for example, during the period from timing T4 to timing T5 shown in FIG. 5 (A).
• a symbol sequence indicating “+1, — 1” is continuously output to the FSK modulator 16.
• FSK modulator 1 6 for example, in the period from timing T 4 to timing T 5, the modulated wave signal modulated by FS ⁇ ⁇ corresponding to “+1” and “one 1” is transmitted by the transmission processing circuit 17.
• controller 1 0 1 Output from controller 1 0 1 That is, in the area of the control information 3 3 in the frame in which there is no message that needs to be notified to the mobile transmission / reception device 10 0 2, the FS ⁇ modulator 16 to the transmission processing circuit 17 A modulated wave signal with binary FS ⁇ modulation is sent, and the line controller 1 0 1 alternately performs FS ⁇ modulation corresponding to the two types of symbols +1 and 1 The modulated wave signal thus output is output. In this way, when a modulated wave signal subjected to binary FS modulation is output from the line control device 1001, the mobile transceiver device 102 can perform synchronization processing such as clock reproduction.
• the non-modulation identification data set in the function channel identification information 3 2 ⁇ in the above embodiment may be omitted.
• the function channel identification information 3 2 ⁇ ⁇ is set to unmodulated identification data in the same manner as in the above embodiment.
• the area of the control information 33 may be able to specify that the control message is not transmitted on the mobile transmission / reception device 10 2 side.
• the data transmitted in the area of the control information 33 when there is no message that needs to be notified to the mobile transceiver 100 has a specific meaning for the mobile transceiver 100. Since this is data that does not exist, by setting the functional channel identification information 3 2 ⁇ to unmodulated identification data, it is possible to specify the period during which invalid control information is transmitted by the mobile transceiver 100 2 .
• notification is given to the mobile transceiver 1 0 2
• the frame data processing unit 15 sets the non-modulation setting data in the control information 3 3 area and outputs it to the FSK modulator 1 6.
• the carrier signal is output from the line control device 101.
• the present invention is not limited to this, and any configuration that stops the FSK modulation operation by the FSK modulator 16 can be adopted.
• the FSK modulator 16 outputs an unmodulated control signal to output an unmodulated carrier wave signal (or intermediate frequency signal, etc.). It may be sent to the keypad 16.
• the mobile transmission / reception device 102 receives the non-modulation identification data as the function channel identification information 3 2 B, the field intensity of other control channels is set, for example, in the period during which the area of the control information 3 3 is transmitted.
• An arbitrary reception operation such as detection may be performed. That is, it is not necessary to limit the operation of the mobile transmitting / receiving device 102 in the area of the control information 33 included in the same frame as the unmodulated identification data.
• the information transmitted from the line control device 1001 to the mobile transceiver device 102 on the control channel has been described as having a frame structure as shown in FIG. It may have a different frame structure.
• the area of random access control information 35 as shown in Fig. 6 is included. 7562
• -26-It may have a frame structure.
• a PTT (Push-To-Talk) switch (not shown) is turned on in the mobile transmission / reception device 1 0 2 ( In response to being pressed, for example, a call request message is immediately sent from the mobile transmission / reception device 1 0 2 to the line control device 1 0 1 on the control channel. Then, on the side of the line control device 100, it is necessary to return access control information indicating whether random access transmission is permitted or prohibited, for example, by checking the availability of the radio channel. At this time, it is conceivable to set the access control information in the area of the control information 33 among the information having the frame structure as shown in FIG.
• the area of the random access control information 35 is separated from the area of the control information 33 and is arranged at a position subsequent to the area of the control information 33. Then, the access control information indicating either random access transmission permission or prohibition may be set in the area of random access control information 35.
• the random access provided by the wireless communication system 100 is not limited to the slot aloha system, for example, ICMA-PE (Idle signal Casting Multiple Access-Pertial Echo), which is also used in the ARIB-T61 system. It may be of a system.
• the line controller 1 0 1 has busy / idle information indicating whether the wireless channel is busy (busy) or unused (idle) in the area of the random access control information 35, What is necessary is just to set the collision control information etc. which made a part of the uplink information transmitted from each mobile transmission / reception apparatus 102 a partial echo.
• the control information 33 Corresponding to the area of random access control information 35 after an unmodulated carrier wave signal (or intermediate frequency signal, etc.) is sent from the FSK modulator 16 to the transmission processing circuit 17 corresponding to As a result, a modulated wave signal subjected to 4-level FSK modulation is sent.
• the transmission processing circuit 17 outputs an unmodulated carrier wave signal from the line control device 101 corresponding to the area of the control information 33, it enters the area of the random access control information 35.
• the output of the modulated wave signal subjected to 4-level FSK modulation is resumed.
• the area of the random access control information 35 is separated from the area of the control information 33, and is arranged at a position subsequent to the area of the control information 33, so that the area of the control information 33 is not modulated.
• the number of times the setting data is set increases, and the time width during which an unmodulated carrier signal is output becomes longer, so that the level of interference with adjacent channels can be reduced.
• Respond to random access from mobile transceiver 1 0 2 thus, it is possible to quickly assign a call channel and shift from the control channel, and establish a communication link with the communication terminal device of the other party in a short time and start a call.

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• Engineering & Computer Science (AREA)
• Computer Networks & Wireless Communication (AREA)
• Signal Processing (AREA)
• Mobile Radio Communication Systems (AREA)
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• 2004
  • 2004-09-21 JP JP2004273172A patent/JP4687047B2/ja not_active Expired - Fee Related
• 2005
  • 2005-09-16 EP EP05785634A patent/EP1793627A4/en not_active Withdrawn
  • 2005-09-16 EP EP10009958A patent/EP2299599B1/en not_active Expired - Lifetime
  • 2005-09-16 RU RU2007115088/09A patent/RU2384015C2/ru active
  • 2005-09-16 CN CN2005800318827A patent/CN101023690B/zh not_active Expired - Fee Related
  • 2005-09-16 DE DE05785634T patent/DE05785634T1/de active Pending
  • 2005-09-16 WO PCT/JP2005/017562 patent/WO2006033427A1/ja not_active Ceased
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