JP2005341604A - Radio communication method, radio communication base station and radio terminal - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To transmit a large amount of user information from a base station to a terminal at high speed by making the transmission rate of radio signals wireless to a downlink line high in relative to an uplink line, to sufficiently deal with requests of users and to effectively utilize frequencies. <P>SOLUTION: In a radio communication method, relating to a basic configuration, for performing radio communication between a radio terminal and one or more radio base stations, a first radio transmission band which uses a radio wave of a first frequency band, is used to perform first radio communication between a terminal transmission means provided in the radio terminal and any one or more base station receiving means of the base stations, and a second radio transmission band at higher speed than the first radio transmission band using radio waves of a second frequency band higher than the first frequency band is used to perform second radio communication between the base station transmission means of any one or more radio base stations and a terminal receiving means of the radio terminal. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a radio communication method, and in particular, the transmission rate of a downlink, which is a radio transmission path from a base station to a terminal, is relatively higher than that of an uplink, which is a radio transmission path from a radio terminal to a base station. The present invention relates to a radio communication method for super high speed down link (hereinafter referred to as SDL) transmission.

  2. Description of the Related Art In recent years, various systems have been proposed for wireless communication systems such as a personal handy-phone system (hereinafter referred to as PHS) and the SDL system as communication / information processing technology advances.

  The demand for wireless communication systems such as PHS and wireless local area network (LAN) is increasing due to the development of various information media. The need to do is also increasing. In view of such a need, in the field of wireless communication systems, it is desired to widen the transmission wave frequency as in wired communication systems. In the conventional radio communication system, the transmission speeds of the uplink, which is a line for transmitting a radio signal from the terminal to the base station, and the downlink line, which is a line for transmitting the radio signal from the base station to the terminal, are the same. And two-way wireless communication was performed. However, the downlink transmission amount for transmitting user information requested by the user to the terminal is considerably larger than the uplink transmission amount for transmitting only control information or the like.

  This is a common problem not only for mobile communication but also for wireless LAN and various other wireless services. However, since the frequency resources in radio are limited, it is difficult to increase the bandwidth in the currently serviced frequency band, and the development of higher unused frequencies (quasi-millimeter wave / millimeter wave band) is desired. Yes.

  A conventional frequency arrangement example is shown in FIG. For example, a Japanese digital automobile telephone system RCRSTD-27B (Research Center of Radio System STanDard 27B-Radio System Research Center Standard 27B-) is taken as an example. In this system, the downlink and the uplink have the same transmission rate, and there are 800 MHz band and 1.5 GHz band systems as radio frequency bands. In both frequency bands, the uplink and the downlink are configured in the same frequency band. In the 800 MHz band, a downlink is arranged at 810 MHz to 826 MHz, and an uplink is arranged at 940 MHz to 956 MHz. Since the conventional system assumes downlink and uplink of the same transmission rate, transmission / reception is performed in the same frequency band. However, there is a problem when considering application to an SDL system.

  Since the SDL system assumes a broadband downlink, it is difficult to achieve a low frequency band such as the 800 MHz band from the viewpoint of securing a wide bandwidth and effective use of the frequency. For example, when trying to transmit at about 100 MHz, it may be said that it is impossible for one user to secure a 100 MHz band in the 800 MHz band. For this reason, transmission from a quasi-millimeter wave band of about several GHz to a millimeter wave band of about several tens of GHz is required.

  On the other hand, as a conventional example of a wireless communication system having different transmission systems, there is an automobile phone in the United States. In the transition period from analog to digital, a handset for a car phone coexists with an analog machine (analog car phone) and a digital machine (digital car phone) and can transmit and receive in both areas. This system uses completely different communication methods of analog and digital, and the transmitter / receiver has few common circuit parts, and has a configuration in which one analog car phone and one digital car phone are provided. Therefore, there is a problem that the circuit scale becomes large.

Next, a conventional example of a method for synchronizing with a reference signal source will be described with reference to FIG. FIG. 68 shows a configuration of a phase locked loop (PLL-) 680 for obtaining a frequency n / m times the oscillation frequency x of the reference oscillator. The signal of the oscillation frequency x is 1 / m in frequency by the frequency divider 681 and input to the phase comparator. The signal of the voltage controlled variable frequency oscillator (oscillation frequency y) is input to the phase comparator 683 after the frequency is reduced by 1 / n by the frequency divider 682. The phase comparator 683 outputs a voltage value corresponding to the phase difference between the two. The output of the phase comparator is input to a loop filter 684 that determines the frequency tracking characteristic of the PLL 680. The output of the loop filter 684 is input to a voltage controlled variable frequency oscillator (VCO) 685. The PLL 680 is controlled so that the phase difference between the two signals at the input of the phase comparator 683 is zero. Therefore, the following equation (1) is established.
x / m = y / n (1)
Therefore, the output y of the voltage controlled variable frequency oscillator is y = xn / m (2)
It becomes. As described above, the frequency divider 681 and the frequency divider 682 synchronize with the output of the reference oscillator, and the oscillation frequency becomes n / m times. By using the PLL 680 in this way, a signal having a frequency n / m times can be obtained in synchronization with the reference signal source. However, since the method using the PLL requires a VCO (voltage controlled variable frequency oscillator) 685, it is necessary to provide an oscillator as a separate configuration. The conventional wireless communication system transmits control data and user data at the same radio frequency, but the capacity of both data is not the same and the amount of data is much larger than the amount of control data. Data and control data are transmitted and received by separate transmission means. In addition, large-capacity data cannot be sent unless it is a thick transmission line, but sending small-capacity data via a thick transmission line is inefficient and uneconomical. A thick transmission line cannot be formed unless a high frequency is used. However, if a thin transmission line is to be formed at a high frequency, it is difficult to form the transmission line due to the influence of jitter or the like due to the high frequency.

  As described above, in order to support transmission of wide and large-capacity information as in PHS and wireless LAN, the uplink transmission rate from the terminal to the base station and the downlink transmission rate from the base station to the terminal Is equivalent, the wireless line could not be used effectively.

  Further, in a millimeter wave like the 60 GHz band, the radio wave propagation loss becomes very large due to the high frequency. Therefore, when communication is performed at a certain distance, the transmission power must be increased. Although the portable terminal used in the SDL system is used in the vicinity of the human body, it is not preferable from the viewpoint of safety and health to perform transmission with high power at the terminal. In addition, mobile terminals are generally driven by a battery, but transmitting with high power has the problem of shortening the time that the battery can be used continuously, and increasing the frequency of charging and replacement of the battery. There is also a problem that it is complicated.

  Furthermore, millimeter wave band devices are very expensive, and the need for millimeter wave band transmission devices at terminals makes it difficult to meet the demand for lower prices. From the viewpoint of volume, it is difficult to reduce the size by providing a millimeter-wave band transmission device.

  The most suitable modulation method for the signal used for transmission depends on which bandwidth (transmission speed), frequency band, size of transmission / reception circuit, device selection, frequency utilization efficiency is important. It will change. For example, when frequency utilization efficiency is regarded as important in narrowband communication such as a car phone, linear modulation such as π / 4DQPSK method or QAM method is adopted. However, when performing wireless communication in a wide band, such linear modulation requires a wireless component that operates linearly over a very wide band, and it has been difficult to reduce the size and power consumption.

  In the SDL system where the transmission rate is clearly different between the downlink and the uplink, if the same modulation method or a modulation method similar in nature is adopted as in the past, a method that matches either is selected, or Even if the performance deteriorates, the only way to do this is to select the appropriate method for both downlink and uplink.

  Furthermore, the conventional wireless communication system realizes information transmission of various qualities by combining the wireless communication systems which are different transmission systems. That is, diversification of transmission quality is realized by accommodating two transmitters / receivers of different transmission methods in one casing. For this reason, the configuration of the transceiver is disadvantageous.

  The present invention makes it possible to transmit information transmitted through the downlink at high speed to the terminal at a high speed by relatively increasing the transmission speed of the downlink compared to the uplink, and has high frequency utilization efficiency. An object is to provide a wireless communication system.

  It is another object of the present invention to provide a radio communication system that can widen the frequency band of transmission waves used in a radio communication system as well as a wired communication system.

  It is another object of the present invention to provide a wireless communication system capable of simplifying a configuration of a reference oscillator having a required signal transmission rate and simplifying a configuration of a portable electronic device in a multimedia service.

  A wireless communication method according to a basic configuration of the present invention is a wireless communication method for performing wireless communication between a wireless terminal and one or more wireless base stations, and a first wireless transmission band that uses radio waves of a first frequency band. Is used to perform first wireless communication between a terminal transmission unit provided in the wireless terminal and one or more base station reception units of the base station, which is higher than the first frequency band. One or more base station transmission means of the radio base station using a second radio transmission band faster than the first radio transmission band using radio waves of the second frequency band, and terminal reception of the radio terminal Second wireless communication is performed with the means.

  As described above, in the wireless communication method according to the present invention, the transmission rate of the radio signal on the uplink line is set to be relatively low, and the transmission rate of the radio signal on the downlink line is set to be relatively high. Can be transmitted from the base station to the terminal at a high speed, sufficiently satisfying the user's demand, and the frequency can be used effectively.

  Several preferred embodiments of a wireless communication system according to the present invention will be described in detail with reference to the accompanying drawings.

  Prior to describing the embodiment, the basic concept of the present invention will be described with reference to the block diagram of FIG.

  The wireless communication system according to the present invention includes a plurality of base stations each sharing a predetermined service area, and a plurality of terminals movable within the predetermined service area, as shown in FIG. An uplink line 4 that is set between each terminal 1 and each base station 5 and wirelessly transmits predetermined information from the terminal 1 to the base station 5, and each terminal 1 and each base station 5 and a downlink line 8 for wirelessly transmitting predetermined information from the base station 5 to the terminal 1.

  The terminal 1 transmits a radio signal at a relatively low transmission rate to the base station 5 via the uplink line 4 and the base station 5 via the downlink line 8. And high-speed receiving means 3 for receiving a radio signal transmitted at a relatively high transmission speed.

  The base station 5 includes low-speed receiving means 6 for receiving a radio signal transmitted from the terminal 1 via the downlink line 4 at a relatively low transmission rate, and the base station 5 via the downlink line 8. High-speed transmission means 7 for transmitting a radio signal at a relatively high transmission rate to the terminal 1. Reference numeral 9 denotes a terminal side transmission / reception unit including the low speed transmission means 2 and the high speed reception means 3.

  Next, individual embodiments will be sequentially described. First, as shown in FIG. 2, in the first embodiment, in communication with a terminal (personal portable electronic device possessed by an individual) 1, a broadband signal is transmitted to the downlink 8 from the (relay) base station 5 to the electronic device 1. And a narrow band signal is transmitted to the uplink 4 from the electronic apparatus 1 to the relay base station 5. Broadband is used for the downlink 8 for communication including images, voice, file editing, information distribution / publicity, broadcasting, etc. In this case, the uplink 4 uses information for controlling the downlink 8 and channels In the case of multimedia selection, a media selection control signal, voice, and the like.

  In FIG. 2, a personal portable electronic device (terminal) 1 transmits / receives data to / from a base station 5 via lines 4 and 8, and has a configuration of a transmission / reception unit 9 and this transmission / reception unit. 9, a signal processing unit 10 for processing data received and a control signal to be transmitted, an input unit 13 for inputting a control signal for transmission, and an output unit 16 for outputting the transmitted data. I have. The signal processing unit 10 performs A / D conversion and encoding on the data to be transmitted and performs D / A conversion and decoding on the received data, and temporarily stores the data to be processed. And a memory 12 to be stored. The input unit 13 includes a keyboard 14 such as a 10 key for inputting control information, and a microphone 15 for inputting voice, and the output unit 16 includes a speaker 17 for outputting voice related to transmitted data and a character. And a display 18 for displaying such information.

  As shown in FIG. 3, the radio communication system according to the second embodiment is applied to, for example, the field of broadcast communication in which broadcasting and communication are merged. In that case, an electronic device owned by the individual will be able to receive the broadcast signal. In such a case, the relay base station 5 selects one of a plurality of broadcast signals and transmits it to the electronic device 1 in response to a request from the user of the electronic device. By the way, the future electronic device 1 processes and uses the information received by broadcasting as desired. At this time, the information may be stored in the relay base station according to the request of the electronic device and processed as described later. FIG. 3 shows an example of the second embodiment.

  As shown in FIG. 3, the relay base station 5 in the wireless communication system as described above receives data by transmission / reception unit 20 for transmitting / receiving data to / from electronic device 1 via lines 4 and 8 and broadcast or the like. A signal processing unit 25 that processes the processed data for processing and use, and a wired network termination device 28 that receives an information signal transmitted via a wired network such as a CATV, a subscriber optical cable, or an ATM network, and the like. I have. The transmission / reception unit 20 receives a control signal sent from the electronic device 1 via the uplink 4 and outputs data to be transmitted to the electronic device 1 side via an antenna, and a received radio frequency A reception unit (Rx) 22 that converts (RF) signals into predetermined frequency signals and a transmission unit (Tx) 23 that converts data to be transmitted into RF signals are included. The signal processing unit 25 selects a channel according to a user request of various electronic devices 1 input from the channel data via the wired network terminating device 28 and transmits desired data to the electronic device 1. And a memory 27 for storing desired data in response to the user's request.

  In the second embodiment, the electronic device may not be for personal use. That is, it may be shared by several people as in the home. In particular, as shown in FIG. 4, the relay base station 5 is attached to a power pole or the like, and information is transmitted there through an optical cable, a coaxial cable, or the like. A cordless telephone base station used for home use, a television set, a VTR, a home work station, or the like may be connected to the electronic device 1 attached to the home or car. In this case, the electronic apparatus 1 transmits information requesting transmission and information such as whether or not to store the information to the relay base station 5 in accordance with the request from these home devices. Accordingly, the relay base station 5 selects information and transmits it to the electronic device 1 while accumulating it in some cases.

  The third embodiment is applied to a case where the received information is processed and further retransmitted when the amount of information generated by a human appears to be large. One of the third embodiment is shown in FIG. The relay base station 5, the information amount increasing server 30, the communication partner server 31, the information source database 32, and the like are interconnected by a network 33 such as a LAN, MAN, or ATM network. The information source database 32 transmits the information A to the electronic apparatus 1 via the downlink 8 by the relay base station 5. At the same time, the information A is also transmitted to the information amount increasing server 30. The electronic device 1 generates a processing operator α (x) for processing the information A and additional information β. Here, the electronic apparatus 1 transmits the processing operator α (x) and the additional information β to the information amount increasing server 30 via the uplink base station 5 via the relay base station 5. The amount of information held by the operator and additional information is information generated by a human user of the electronic apparatus 1, and the capacity is small. The information amount increasing server 30 processes the information A with the processing operator α (x) and the additional information β, creates α (A) + β, and transmits it to the server 31. The information amount increasing server 30 may send information α (A) + β obtained by processing to the electronic device 1A via the relay base station 5A and display it on the display 18 (see FIG. 2) of the electronic device 1A. Alternatively, α (A) + β may be generated in the electronic device 1 and displayed on the display 18.

  As described in the third embodiment, the amount of information generated by humans may seem large. This is a case where the received information is processed and further retransmitted. That is, the mobile electronic device side receives the original information A, processes it or adds it, converts it into a form of α (A) + (B), and retransmits it. In this case, α (A) + β may seem to be a large amount of information. In many cases, the original information A has a very large capacity. However, the amount of information generated by humans is a conversion operation called α (X) and additional information called β. The amount of information necessary to represent the conversion operation (X) and the additional information β are information generated by humans, and the generation speed does not exceed the amount of information that can be generated by the human brain and body. Therefore, it is lower than the amount of information that can be received by humans because it does not reach a certain speed. In such a case, instead of transmitting α (A) + β, only the conversion operation α (X) and the information β are transmitted, and even if α (A) + β is generated on the reception side as a result, Is the same.

  In this way, the relay base station 5 sends the information A to the electronic apparatus 1, and at the same time, the relay base station 5 stores the information A. In the electronic apparatus 1, the user transmits only the conversion calculation α (X) and the information β to the relay base station while viewing the information A. At the same time, the electronic device 1 creates and displays α (A) + β, and the relay base station also creates α (A) + β and transmits it to the communication partner. As described above, it is possible to realize a service that requires transmission of large-capacity data without using unnecessary frequency resources and using a small-capacity storage battery.

  Therefore, it is a case where a file A is received, processed or added to it, converted into a form of α (A) + β, and retransmitted. In this case, α (A) + β may seem to be a large amount of information. However, the amount of information generated by humans is a conversion operation called α (X) and additional information called β. The amount of information necessary to represent the transformation operation α (X) and the additional information β are information generated by humans, and the generation speed exceeds the amount of information that can be generated by the human brain and body. In addition, as described above, since the speed is not constant, the amount of information that can be received by humans is low. In such a case, instead of transmitting α (A) + β, only the conversion operation α (X) and information β are transmitted, and α (A) + β is generated at the base station and transmitted to the other party. .

  All operations such as file editing can be realized by such operations. That is, the original file is transmitted to the mobile terminal via a broadband downlink, and the user performs editing while viewing the original file. The screen viewed by the user is updated according to the editing contents while editing by each terminal. At the same time, the edited content is transmitted to the base station, and the original file is also updated in accordance with the edited content. In this way, editing from a portable terminal to a base station becomes possible with very small transmission.

  By the operation as described above, the wireless transmission band is reduced, the wireless transmission power is reduced, and further, efficient information transmission with the storage battery is enabled.

  Such processing can also be applied to examples other than the file operations described above. That is, A is the data of the face and voice of the user of the personal portable electronic device, and the base station or the relay station stores such information. The personal portable electronic device transmits only the spoken content and the parameters of the difference in intonation from the usual to the base station. Alternatively, only a point that is significantly different from the usual facial expression of the user and expression parameters of emotions are transmitted wirelessly. The base station synthesizes it and re-synthesizes and transmits the original voice and original screen transmission. As a result, the wireless transmission bandwidth is reduced, the wireless transmission power is reduced, and efficient information transmission with the storage battery is enabled.

  Further, the relay base station 5 that performs processing such as α (A) + β may be at the same position as the wireless transmission / reception device, but is connected by a communication network such as a computer owned by the user of the electronic device. It may be in a remote place or may be built in the communication partner device.

  It should be noted that a broadband signal is used for the downlink from the relay base station or base station described above to the electronic device or personal portable electronic device, and a narrowband signal is used for the uplink from the electronic device to the relay base station. Such a communication form is performed as in the communication system of the fourth embodiment shown in FIG.

  In the fourth and fifth embodiments, in communication with an electronic device owned by an individual, a broadband signal is transmitted to the downlink 8 from the relay base station to the electronic device, and in the uplink 4 from the electronic device to the relay base station. The present invention is applied to two forms: a communication form that transmits a narrowband signal and a communication form that both transmit a narrowband signal. A wide band is used for the downlink 8 for communication including images, file editing, information distribution / publicity, broadcasting, and the like. In this case, the control signal, the conversion operator, and the like are used for the uplink 4. In a communication mode in which both of them transmit a narrow-band signal, they are used for both voice and low-speed data transmission. For example, in FIG. 7, it is highly desirable to provide the uplink 4 with one narrow-band link and the downlink with two narrow-band and wide-band links 8 and 34. This fifth embodiment is shown in FIG. In FIG. 7, reference numeral 34 denotes a narrowband downlink line using a low frequency. Furthermore, it is desirable that which of the two links is used is determined according to the request of the electronic device. That is, when a call is made from an electronic device, a narrowband downlink 34 is requested for a voice call, and a wideband downlink 8 is requested for an image transmission request.

  FIG. 8 shows a basic configuration of a radio communication system according to the fifth embodiment. The configuration shown in FIG. 8 is different from the configuration shown in FIG. 1 in that low-speed transmission means 35 provided in the base station 5, low-speed reception means 36 provided in the terminal 1, and between these low-speed transmission means 35 and reception means 36. And the downlink line 34.

  When communication is started from the terminal 1 (electronic device), first, what kind of communication is performed using the narrowband uplink 4 is transmitted to the base station 5 or the relay base station, and based on the transmission signal It is reasonable to set which of the two to select as the downlink and open the bidirectional link. When communication addressed to the electronic device 1 reaches the relay base station 5, if two narrow-band and wide-band downlinks are provided, the incoming call to the electronic device 1 is first made using the narrow-band link. Is transmitted to the electronic device 1 and the electronic device 1 receives or transmits to the base station using the link with the call accordingly, and receives the corresponding link assignment.

  In this case, the narrowband links 4 and 34 may be narrowband bidirectional transmission means operating independently of each other. For example, a transmission method using a TDMA / TDD (Time DMsion Multiple Access / Time Division Duplex) method may be used.

  The sixth embodiment is applied to a case where a frequency arrangement problem occurs if the uplink and downlink bands are significantly different. That is, when this is to be realized by FDMA / FDD (Frequency Division Multiple Access / Frequency Division Duplex), if the specifications of the duplexer of the terminal are the same for all terminals, the frequency of the uplink frequency and the downlink frequency It is desirable to make the intervals the same. At that time, in the narrowband uplink, the frequency difference with the adjacent channel becomes much wider than the uplink bandwidth, and many frequency bands remain unused, which is extremely inconvenient. Therefore, the uplink is band-spread with a pseudo-random signal sequence, and is transmitted with the bandwidth almost the same as that of the downlink. If the spreading ratio is large, this uplink frequency can be shared with other systems.

  The seventh and eighth embodiments are applied when high-speed downlink is susceptible to multipath and cannot be transmitted over long distances. Here, even if the bandwidth is narrow, there are sometimes requests for transmission far away. In such a case, the signal that is desired to reach a long distance is transmitted after being spread with a long-period pseudo-random sequence, and the short-distance large-capacity signal is transmitted after being spread with a short-period pseudo-random sequence. By doing so, both requirements can be satisfied. Furthermore, since the transmission rate can be freely selected by selecting the series according to the location of the electronic device, it is possible to perform communication with high flexibility when signals of various bands are mixed. Become. Alternatively, when wireless circuits with different data rates coexist originally, each line is spread by a pseudo-random sequence having a sequence length such that the spread bandwidth is approximately the same, and the frequency band can be effectively used. A wireless communication system can be provided.

  Furthermore, when such a spread spectrum method is used, the same frequency band can be used for a plurality of links, so that the base station and relay base station equipment as well as personal portable electronic devices and electronic devices can be compactly weighed. Can be easily realized.

  In the ninth embodiment, if the transmission / reception timing is changed between transmission and reception and the communication method is such that both are not performed at the same time, it becomes possible to freely select the frequency of the uplink and the downlink. This is applied when more effective use can be achieved.

  In the tenth embodiment, if the uplink is made to be random access so as to correspond to the wireless LAN, access to the server and database connected to the network can be performed in an easy procedure, and many advantages are produced. Applies to

  The eleventh and twelfth embodiments will be described with reference to FIGS. FIG. 9 is a block diagram of an eleventh embodiment showing the configuration of the SDL system to which the present invention is applied. As shown in the figure, a memory 42 is provided between the information providing station 41 and the base station 5, and information obtained through the communication line 43 is stored in this memory. Although the portable electronic device 1 accesses the base station by wireless communication, the information that many portable electronic devices desire is almost stored in the memory, and most of the information exchange is executed only through the connection line 44. Is possible.

  Although the wireless communication post and the memory function as a pair, as another embodiment of the present invention, it is possible to connect a plurality of wireless communication posts to one memory. FIG. 10 is a diagram for explaining the state of the memory in the system according to the eleventh embodiment of the present invention. Information 47 and 48 obtained from the information providing station is stored in the memory. This information is divided into levels according to the access frequency, and when new information is accessed, the stored contents are discarded from the information 23 with low access frequency, and the new information 46 is written in the memory space 45.

  As another example, if the memory space is sufficiently large with respect to the amount of information, all information can be written in the memory in advance.

  As another example, when the information has an expiration date, such as a newspaper or a weekly magazine, the information in the memory can be deleted or new information can be overwritten when the expiration date comes. .

  FIG. 11 is a diagram illustrating a state of the information providing service by the SDL system according to the twelfth embodiment. The information providing station 32 provides newspapers, magazines, images, sounds, traffic information or personal information. This information providing station is connected to the base station 5 by a communication line 49. The base station 5 is installed in a station, a building, a road, or the like, and transmits information in response to a request from the portable electronic device 1. Alternatively, some information is always transmitted from the base station.

  The wireless communication systems according to the first to twelfth embodiments described above relate to the SDL system shown in the conceptual diagram of FIG. The radio channel is composed of a broadband downlink from the base station to the personal portable terminal device and a narrow-band uplink from the terminal to the base station. In these embodiments, only the asymmetry of the uplink and downlink transmission rates has been proposed, and no reference has been made to frequency arrangement or modulation scheme.

  A conventional frequency arrangement example is shown in FIG. Take Japan's digital car phone system RCR STD-27B as an example. In this system, the downlink and uplink have the same transmission rate, and there are 800 MHz band and 1.5 GHz band systems as radio frequency bands. In both frequency bands, the uplink and the downlink are configured in the same frequency band. In the 800 MHz band, a downlink is arranged at 810 MHz to 826 MHz, and an uplink is arranged at 940 MHz to 956 MHz. In the conventional system, downlink / uplink with the same transmission rate is assumed, and transmission / reception is performed in the same frequency band. However, when application to an SDL system is considered, a problem occurs.

  Since the SDL system assumes a broadband downlink, it is difficult to achieve a low frequency band such as the 800 MHz band from the viewpoint of securing a wide bandwidth and effective use of the frequency. For example, when trying to transmit at about 100 MHz, it may be said that it is impossible for one user to secure a 100 MHz band in the 800 MHz band. For this reason, transmission from a quasi-millimeter wave band of about several GHz to a millimeter wave band of about several tens of GHz is required.

  FIG. 12 shows an example of frequency arrangement when the wireless communication system according to the present invention is configured by a 60 GHz band SDL system.

  On the other hand, the capacity of information that can be generated by humans has an upper limit due to human capabilities. On the other hand, the amount of information that humans can perceive is much larger than the amount of information that humans can generate. Information that can be generated by humans is limited even if all information such as voice, gestures, keyboard / mouse input, facial expressions, etc. are added. The amount of human voice information is far less than 64 kbps. Even if information transmission means between various human machines such as a keyboard and a mouse is used, they do not exceed the amount of information generated by all individual human brains and body organs. Even if all are combined, it is considered that the average does not exceed 100 kbps.

  On the other hand, the amount of information that can be received by humans is extremely large. Humans receive a variety of information from multiple media such as voice, images, atmosphere, touch, and olfaction through perceptual organs that can move independently. Furthermore, human brains and body organs can only obtain information on the capacity that can be processed by brain and body organs from information obtained from various sensory organs, depending on the individual human history and processing priority. Extract from the obtained information and process. In addition, information that is much larger than information generated by individual human beings through daily life is received. The information receiving means such as which information is received according to the received information is fed back. The way of returning is different for each individual. Therefore, even if many people receive the same information, the way of processing is greatly different. That is, humans can receive much larger information than the amount of information that can be processed by individual human brains and body organs.

  This can also be seen by the difference in size between the part responsible for receiving information in the human brain and the part responsible for transmitting information. The audiovisual area of the brain is extremely large. On the other hand, the part about language development is not so big. Nerves are stretched all over the body, and various information is collected in the brain and spinal cord. The amount of information is extremely large, but the information generated by the brain is limited to speech and a few gestures. Even the thickness of the nerve that is the information transmission path in the body is the optic nerve that is responsible for receiving visual information.

  This can be understood from engineering applications. That is, when creating image information to be received by humans, in order to create image information that makes humans feel natural, information of several megabits or more is generally required per second. With videos created with less information, humans can easily find the unnaturalness of movement and shape. A human cannot generate a corresponding amount of image information. Information of human facial expressions is much smaller than image information generally perceived by human eyes. This can be inferred from the fact that the compression ratio is extremely high when band compression of an image is performed in consideration of human facial expressions. Band compression of images that take into account this human expression has been studied in detail by Professor Harashima and others at the University of Tokyo, and its extremely high compression ratio is known. The information that human faces have is extremely small in volume and is almost the same for voice. If current bandwidth compression technology is used, audio information can be compressed to about 4 kilobits per second, so the amount of information is small.

  The amount of information is also limited when information is generated by playing a musical instrument instead of voice. Considering the amount of information generated during the performance of the piano, the piano has 88 keys, and when one of the keys is played, less than 7 bits of information are generated. If one person can press 10 keys early in a second, 10 fingers, and the sound level changes to 1000 steps (10 bits), 7 * 10 * 10 * 10 = 7000, which is 1 second. It is 7 kilobits per hit, and this does not change depending on the piano model and tone. The information speed generally required when recording a piano performance is about 100 kilobits per second, and the amount of information generated by the performer is only 1000 bits per second as described above. Although it seems that a large amount of information is generated by the performance of the musical instrument, the information generated from the musical instrument is modulated by the information generated by the human being with the timbre and personality information of the musical instrument. It just looks like this big information.

  On the other hand, when receiving information, humans can receive and process extremely large amounts of information. An orchestra in which 150 performers generate information, and if only one person makes a mistake, it can be easily identified. In addition, instrument-specific information generated from each instrument is modulated by the information generated by the performer, and the information that has become extremely large is discerned, and humans always recognize and extract their characteristics. It is that.

  Consider a situation where five people are seriously meeting each other. Each person receives information from the other four who are making every effort to transmit their opinions. All the information from the other four people is not processed by the receiving human brain, but at least through the human sensory organ. Even after the meeting, the participants have a general grasp of what went on. This is possible because it receives information from four others and processes the necessary parts of it in the brain. On the other hand, regarding the transmission of information, it is generally impossible for one person to generate information on average that exceeds the sum of the information generated by the other four persons on average. Therefore, there is a large difference between the amount of information generated by humans and the amount of information that can be received, and the amount of information generated by humans is extremely small compared to the amount of information that can be received by humans.

  The amount of information transmitted by a conventional personal portable electronic device is smaller than the amount of information that can be generated by a single person, and transmission at the level of voice is not possible. Therefore, the transmission capacity is clearly lower than the amount of information that can be generated by humans. However, when broadband wireless transmission becomes possible in the future, wireless transmission at a transmission / reception transmission rate lower than the information transmission rate that can be received by humans and higher than the information generation rate that can be generated by humans becomes possible. Come. At this time, if the transmission / reception speed is the same as in the prior art, effective use of the frequency cannot be achieved.

  Conventionally, the same modulation method is generally used for both downlink and uplink. For example, in a narrowband digital automobile telephone system using TDMA in Japan and the US, the π / 4DQPSK system is adopted for both the downlink and the uplink. A proposal to adopt a modulation method different in downlink / uplink is made in the US digital automobile telephone standard (IS-95) using CDMA. The uplink is OQPSK (Offset Quadrature Phase Shift Keyin), and the downlink is QPSK (Quadvature Phase Shift Keying -4 phase shift keying). However, the information transmission rate is the same, and the configuration is clearly different from the SDL system. Moreover, since the same PSK is adopted, the properties are very similar. There is no example in which modulation systems having completely different properties are employed in downlink / uplink systems having completely different transmission rates.

  A thirteenth embodiment of the present invention is shown in FIG. Communication is performed between the wireless communication terminal 101 and the portable wireless terminal 102 connected to the wired network. The relationship between the radio frequency band and transmission speed in this communication is shown in FIG.

  In the wireless line (downlink) from the wireless communication terminal 101 to the portable terminal 102, transmission is performed at a transmission rate R1 at a wireless frequency f1 in the 60 GHz band. In this embodiment, since BSPK which is binary modulation is used as the modulation method, the transmission rate and the used bandwidth are described as the same. R1 has a transmission rate of 100 Mbps, and by performing in the 60 GHz band, it is possible to secure a 100 MHz band, thereby realizing wideband transmission.

  A wireless line (uplink) from the mobile terminal 102 to the wireless communication terminal 101 performs transmission at a transmission rate R1 lower than R1 using a frequency f2 in the 800 MHz band. Since it is considered that the information generated in the portable terminal 102 is mainly input by keys or input signals by voice, information transmission can be sufficiently performed if there is a transmission speed of about several tens of kbps. In this embodiment, it is 30 kbps. If the transmission is 30 kbps, a sufficient bandwidth can be secured even in the 800 MHz band, and transmission in this band is possible.

  In addition, since the radio frequency band at the terminal is low, there is little radio wave propagation loss in space, and transmission may not be performed with such strong power. Further, since the transmission bandwidth is small, the total power can be small. Therefore, power consumption can be reduced, and the time during which a continuous call can be made can be extended without recharging or replacing the battery.

  Furthermore, devices in the 800 MHz band are widely used for automobile telephones, etc., and inexpensive devices are widely used, and miniaturization of devices is also progressing. And downsizing are possible.

  A fourteenth embodiment of the present invention is shown in FIG.

  Communication is performed between the wireless communication terminal 301 and the portable wireless terminal 302 connected to the wired network. FIG. 16 shows the relationship between the radio frequency arrangement and the transmission rate at this time.

  A wireless line (downlink) from the wireless communication terminal 301 to the portable terminal 302 is performed at a transmission rate of R1 using a radio frequency f1 in the 60 GHz band. R1 is a high-speed line of 100 Mbps, for example. At the same time, another downlink is established at a transmission rate of R2 (for example, 30 kbps) at 800 MHz band f2 '. A wireless line (uplink) from the portable terminal 302 to the wireless communication terminal 301 is performed at a transmission rate of R2 at a radio frequency f2 in the 800 MHz band.

  The difference from the thirteenth embodiment is that another downlink is extended by f2 · R2. The downlink in the 60 GHz band is easily affected by the shielding due to the characteristics of the frequency band. The communication line is disconnected due to shadowing by the shielding object. In this embodiment, it is possible to prevent the entire downlink from being disconnected by installing another link at f2 'on the downlink. When compared with the radio frequency f1 of the 60 GHz band, the radio frequency f2 'of the 800 MHz band has less propagation loss and is not easily affected by shadowing, so the possibility of line disconnection is reduced. For example, by assigning a control channel to the downlink of f2 ′ · R2, even if the downlink of f1 · R1 is interrupted, complete disconnection is not performed, and the protocol and upper state at the end are maintained. The link between the wireless terminal 301 and the portable terminal 302 is maintained by executing the protocol, the interruption protocol, and the like through the control channel. In this case, the portable wireless terminal 302 has a new receiving device of f2 ′ · R2, but the additional portion is small and low enough to ignore current consumption, volume, and price as compared with the receiving device of 60 GHz band. . By adopting the configuration of the radio frequency band / transmission speed system of this embodiment, a highly functional portable terminal can be realized with a small size, low power consumption, and low cost.

  A fifteenth embodiment of the present invention is shown in FIG. Communication is performed between the wireless base station 501 connected to the wired network and the plurality of portable wireless terminals 502. FIG. 18 shows the relationship between the radio frequency band and the transmission speed in this embodiment. Radio waves are transmitted from the radio base station 501 to each mobile terminal 502 (downlink) at frequencies of f1, f1 ′, f1 ″ in the 60 GHz band. The transmission speed of R1 is transmitted from each mobile terminal 502 to the radio base station 501 ( Uplink) It is transmitted at a transmission rate of R2 at frequencies of f2, f2 ′, f2 ″ in the 2.4 GHz band. R1 is 100 MHz and R2 is 2 MHz. Here, broadband transmission in the millimeter wave is performed in the downlink between one base station and a plurality of terminals, and transmission in a relatively narrow band in the 2.4 GHz band is performed in the uplink. As shown in FIG. 18, the frequency arrangement in each terminal is configured so that f2 corresponds to f1, and f2 'corresponds to f1' in order.

  In this embodiment, both the uplink and the downlink are multiplexed using the frequency multiplexing method, but it is also possible to perform multiplexing using an access method such as a time division multiplexing method, a code division multiplexing method, or an Aloha method. In the fifteenth embodiment, the 2.4 GHz band is used in order to make the uplink transmission rate relatively high at 2 MHz. The 2.4 GHz band has a larger propagation loss than the 800 MHz band, but the propagation loss is very small compared to the 60 GHz band, and the transmission power of the terminal is also higher than when the uplink and downlink are configured in the same 60 GHz band. It can be kept small. The terminal has little influence on the human body, and a terminal with low current consumption, small size, and low cost can be configured.

  A sixteenth embodiment of the present invention is shown in FIG. Communication is performed between the wireless base station 701 connected to the wired network and the plurality of portable terminals 702. FIG. 20 shows the relationship between the radio frequency arrangement and the transmission rate in the seventeenth embodiment. The downlink is performed at a frequency f1 of 19 GHz band and a transmission rate R1 of a wide band. Here, R1 is 50 Mbps. The other downlink is configured with a 400 MHz band frequency f3 and a narrow band transmission rate R2 (for example, 2 kbps). The uplink is composed of a 400 MHz band frequency f2 and a narrow band transmission rate R2. As shown in FIG. 20, the frequencies used by the terminal 1 are f1, f2, and f3, and the frequency used by the terminal 2 is f1! , F2 'and f3'. With this arrangement, it is possible to make the interval between the uplink and downlink radio frequencies in the 400 MHz band narrow, and it is easy to synchronize the frequency at the terminal. By arranging the downlink in the 19 GHz band, the broadband of the downlink is realized, and by arranging the narrow band uplink and downlink in the 400 MHz band, the probability of complete disconnection is kept low and stable control is achieved. Is possible. A 400 MHz band downlink receiver can be configured very simply, and can be realized without greatly affecting the total scale of the terminal. By configuring the uplink with a low frequency and low transmission rate of 400 MHz band, a simple portable wireless terminal can be provided.

  A seventeenth embodiment of the present invention is shown in FIG. The seventeenth embodiment relates to a wireless unit (wireless device) of a portable wireless terminal applied to the wireless communication systems of the thirteenth and fifteenth embodiments. The radio apparatus according to the seventeenth embodiment includes an antenna 901 for receiving radio signals of f1 and R1, a receiving apparatus, an antenna 903 for transmitting radio signals of f2 and R2, and a transmitter and other parts of the mobile terminal. An interface 906 and a control device 905 are configured. Here, f1 is a high frequency band (example: 60 GHz band), R1 is a wide band (example: 100 Mbps), f2 is a low frequency band (example: 800 MHz band), and R2 is a narrow band (example: 30 kbps). It is. Since reception / transmission differs from frequency band / bandwidth, it has an independent antenna to transmit / receive. The receiver includes a frequency converter and a demodulator for demodulating a radio frequency band signal into a digital signal. The transmission device includes a digital modulation device and a frequency conversion device for converting a digital signal into a radio frequency (RF) signal. The control device has a function of taking transmission / reception timings of transmission / reception frequency / transmission speed synchronously. By providing the mobile terminal with such a configuration, it is possible to configure a mobile terminal applicable to the radio communication systems of the thirteenth and fifteenth embodiments.

  An eighteenth embodiment of the present invention is shown in FIG. The eighteenth embodiment relates to a wireless unit (wireless device) of a portable wireless terminal applied to the wireless communication systems of the twelfth and fourteenth embodiments. 15 differs from the embodiment of FIG. 15 in that a receiving device 1004 that receives a narrow band (eg, 30 kbps) signal at a low frequency band f 2 (eg, 800 MHz band), and a transmission signal and a received signal of f 2 are combined into one antenna. A duplexer 1006 is provided that accommodates the duplexer. The 800 MHz band transmission 1005 and the reception apparatus 1004 are cheaper than the 60 GHz band reception apparatus, and can be easily downsized. Further, since transmission can be performed at a low frequency and a narrow band, transmission power can be reduced. It is possible to configure a portable wireless terminal with little influence on the human body. By providing the mobile terminal with such a configuration, it is possible to configure a mobile terminal applicable to the radio communication systems of the twelfth and fourteenth embodiments.

  A nineteenth embodiment of the present invention is shown in FIG. The nineteenth embodiment relates to a radio apparatus and a radio base station applied to the radio communication systems of the thirteenth and fifteenth embodiments. In this embodiment, a radio base station will be described as an example. The base station transmits a transmission device 1101 that performs transmission at a transmission rate R1 (for example, 100 Mbps) at a radio frequency f1 in a millimeter wave band (for example, 60 GHz band) that is a first frequency band, and a frequency band that is lower than f1 (for example: A receiving apparatus 1102 that receives a transmission rate R2 (eg, 30 kbps) lower than R1 at a radio frequency f2 in the 800 MHz band) is provided. In addition, a signal processing unit and an interface unit for connecting to a control unit and a wired system are provided.

  By providing a transmission device and a reception device having different frequency bands and transmission rates, it is possible to configure a radio device and a radio base station that can be applied to the radio communication systems of the first and third embodiments.

  A twentieth embodiment of the present invention is shown in FIG. The present embodiment relates to a radio apparatus and a radio base station applied to the radio communication systems of the 14th and 16th embodiments. The radio apparatus of this embodiment includes a transmission apparatus 1201 having a high transmission rate R1 at a frequency f1 in the first millimeter wave band and a transmission apparatus 1202 performing transmission at a low transmission rate R2 at a radio frequency f2 in a frequency band lower than f1. And a receiving device 1203 for receiving at f2, R2.

  By including transmission devices and reception devices having different frequency bands and transmission rates, it is possible to configure radio devices and radio base stations applicable to the radio communication systems according to the fourteenth and sixteenth embodiments.

  A twenty-first embodiment of the present invention is shown in FIG. The twenty-first embodiment is a wireless communication system including a base station 1301 and a terminal 1302. The base station includes a transmitter 1303 that transmits at a transmission rate R1 using infrared rays, a receiver 1304 that receives a transmission rate R2 at a radio frequency f2, and a signal processing unit that interfaces other controls with a wired system. The terminal includes a signal processing unit that performs interface and control with the infrared receiver 1305, the wireless transmitter 1306, and other parts. Transmission (downlink) from the base station to the terminal is performed at a transmission rate R1 using infrared rays. Transmission (uplink) from the terminal to the base station is performed at a transmission rate R2 lower than R1 using radio.

  When the downlink is a radio channel using radio waves, a band corresponding to the transmission speed must be secured. In order to perform high-speed transmission, it was necessary to secure a wide band, and it was necessary to develop an unused high frequency band such as a millimeter wave band. However, in this embodiment, it is possible to configure the system without restriction of securing the radio frequency bandwidth by using infrared as the downlink that requires a wide band. A device using a millimeter wave band or the like is expensive and has a large volume, but an infrared device is inexpensive and has a small volume, and both a terminal and a base station can be realized with a small size and a low price.

  A twenty-second embodiment of the present invention is shown in FIG. The radio apparatus 1401 of the base station includes a transmission apparatus that performs transmission at a high transmission rate R1 (100 Mbps) at a frequency f1 in a first radio frequency band (eg, 60 GHz), and a radio frequency band that is lower than f1 (eg, 800 MHz). And a receiving device for receiving a signal having a transmission rate R2 (eg, 30 kbps) lower than R1 at a frequency f2. The radio unit of the terminal includes a receiving device that receives the signals of f1 and R1, and a transmitting device that transmits the signals of f2 and R2.

  Here, the transmission of f1, R1 and the transmission of f2, R2 are performed by different modulation schemes. If f1 is a millimeter wave band and R1 is about 100 Mbps, it is difficult to obtain a linear device over such a wide band in the millimeter wave band. Therefore, a non-linear modulation scheme is desired in the downlink. In the millimeter wave band, it is effective to improve the frequency utilization efficiency by zone design because the propagation loss is large and the reach of the radio wave is short due to its radio wave propagation characteristics. Also, since the millimeter wave band has a relatively wide band, the utilization efficiency on the frequency axis is not as strict as the conventional microwave. Therefore, a modulation scheme that allows a bandwidth as large as the transmission rate is allowed. For these two reasons, the modulation method is nonlinear modulation, and FSK with a modulation index of 0.5 or more that requires a certain amount of bandwidth is most suitable for implementation.

  On the other hand, the frequency band of the frequency f2 of the signal used in the uplink is a microwave, and the transmission speed is about several tens of kbps. Therefore, it is easy to obtain a linear low-priced and small component, and the linearity problem is eliminated. . However, since the frequency bandwidth to be allocated is small in this frequency band, effective use of the frequency has to be made on the frequency axis. Therefore, a modulation method with excellent frequency utilization efficiency is desired. Although it is linear modulation, π / 4DQPSK, offset QPSK, etc., which are excellent in frequency utilization efficiency, and GMSK, which is somewhat inefficient, are suitable for implementation.

  From another viewpoint, QAM that can send a large amount of information in one symbol is optimal for a high-speed downlink because of its high transmission rate. Although the transmission speed is slow in the uplink, since the information is mainly important information such as control information, BPSK, which is more resistant to errors than QAM (Quadrature Amplitude Modulation-4 phase amplification modulation), etc. is most suitable for implementation. ing.

  As described above, in the SDL system, the uplink and downlink transmission speeds and transmission frequency bands are different. Therefore, it is possible to obtain high-quality lines by using different modulation schemes.

  A twenty-third embodiment of the present invention is shown in FIG. The base stations and terminals shown in this embodiment are those shown in FIG. The downlink from the base station 1501 to each terminal 1502 is transmitted at a transmission frequency R1 (100 Mbps) and a modulation scheme 1 (code multiplex modulation: CDM) at a frequency f1 in the 60 GHz band, and the uplink from each terminal to the base station is 800 MHz. It is transmitted at transmission frequency R2 (8 kbps) and modulation scheme 2 (GMSK) at band frequency f2. Changing the transmission speed, frequency band, and modulation method for the uplink and downlink can obtain a good quality line and reduce the size and power consumption of the terminal.

  A twenty-fourth embodiment of the present invention is shown in FIG. The base station 1601 performs transmission using a transmitter 1603 having a transmission speed R1 at a radio frequency f1 in a quasi-millimeter wave band (19 GHz). The transmission rate R1 is not fixed and is a variable transmission rate of 1 Mbps to 15 Mbps. Modulation method 1 is 4-level FSK. The terminal is equipped with a receiving device 1606 having the same frequency f1, transmission rate R1, and modulation method 1 for reception. In this wideband downlink, data transmission that requires a wideband such as an image is mainly performed. In addition to this downlink, the base station and the terminal are provided with a transceiver of frequency f2 (1.9 GHz), transmission rate R2 (384 kbps), and π / 4DQPSK. The transmission at the frequency of f2 uses the time division multiple access / time division multiplexing (TDMA / TDD) system, and therefore has the same frequency. FIG. 29 is a conceptual diagram showing a system configuration using the base station and terminal of FIG. The base station 1701 has the downlink of modulation scheme 1, f1, R1 in the downlink to each terminal 1702, and has the uplink and downlink of modulation scheme 1, f2, R2. By adopting such a configuration, it is possible to configure a system with less instantaneous interruption due to shadowing as well as obtaining high-quality lines for each.

  In the twenty-fourth embodiment, the same transmission rate R2 is used for both uplink and downlink at f2. Here, the transmission rate R2 for the uplink and the transmission rate R2 'for the downlink may be considered. The control information is mainly transmitted in the uplink and downlink in f2, but in the uplink, in addition to simple control information, retransmission control in the case where the downlink data in f1 is incorrect or in uplink Data transmission is performed. Since downlink data transmission is performed on the high-speed downlink of f1, only control data is transmitted on the downlink of f2. Therefore, information amount asymmetry also occurs in the uplink and downlink at f2. The conventional wireless communication system does not consider information asymmetry, and allocates the same bandwidth in the uplink and downlink. By providing different transmission rates for the uplink and the downlink in the f2 line mainly transmitting control information, more efficient frequency utilization can be achieved.

  The twenty-fifth embodiment of the present invention will be described below with reference to the drawings. First, a digital radio communication system according to the twenty-fifth embodiment of the present invention will be described with reference to FIG.

  A base station and a plurality of portable electronic devices are provided, and a downlink line for transmitting information from the base station to the portable electronic device and an uplink line for transmitting information from the portable electronic device to the base station are provided. Examples of the downlink line and the uplink line include the SDL-Net shown in the first to twelfth embodiments. In SDL-Net, the area covered by the high-speed downlink line is narrow, the area covered by the low-speed uplink line is wide, and the signal transmission speed of the uplink line is higher than the signal transmission speed of the downlink line. However, it is also considered to reduce the size of the portable electronic device by reducing the speed.

  FIG. 31 shows a configuration example of a portable electronic device used in SDL-Net. The digital signal transmitted from the portable electronic device to the base station is subjected to error correction coding, waveform shaping and modulation in the digital part, and converted to an analog signal by a DA converter (DAC) and an interpolation filter (LPF). And input to the mixer. The mixer multiplies the signal output from the DAC by the signal output from the carrier signal generator (oscillation frequency f1), and performs frequency conversion. The mixer output is suppressed by the bandpass filter (BPF). The signal is amplified by an RF amplifier and output from an antenna. On the other hand, a downlink line signal transmitted from a base station is received by an antenna, band-limited by a band pass filter (BPF), and then amplified by an LNA (low noise amplifier). The LNA output is input to the mixer, multiplied by a signal output from the carrier wave signal generator (oscillation frequency f2), and frequency-converted. The mixer output is subjected to suppression of the image after multiplication by the LPF, and then converted to a digital signal by an AD converter (ADC). The ADC output (digital signal) is demodulated by the digital unit.

  In SDL-Net, the uplink signal transmission rate is different from the downlink signal transmission rate (the downlink signal transmission rate is higher than the uplink signal transmission rate), that is, the timing clock is increased. Different for link and downlink. According to the present invention, the clock to be supplied to the digital unit of the uplink can be obtained by connecting the clock used in the downlink via the 1 / n frequency divider, and the circuit configuration can be simplified.

  The frequency dividing device (1 / n) shown in FIG. 31 includes an n-ary counter and a phase shifter as shown in FIG. As a result, the signal transmission speed is different between the uplink and downlink, and the system clock generator can be shared in the system where the uplink signal transmission speed is higher than the downlink signal transmission speed and the circuit configuration is simplified. Can be realized. Further, by adopting the circuit configuration of FIG. 32, an uplink line clock can be generated at an arbitrary phase timing. This operation will be described with reference to FIG. 33. The clock of the downlink line is divided by an n-ary counter and phase-shifted by a phase shifter to an arbitrary phase timing. By adopting the above configuration, uplink and downlink transmission signals can be synchronized.

  Next, a digital wireless communication system according to a twenty-sixth embodiment of the present invention is described with reference to FIG. The wireless communication system according to the twenty-sixth embodiment has a PHS line and a high-speed downlink line, an information service base station connected to a wired network, a PHS base station connected to the information service base station, and a high-speed downlink. Consists of line base stations. A signal transmitted from the information service base station to the portable electronic device is transmitted through a PHS line or a high-speed downlink line. A signal transmitted from the portable electronic device to the information service base station is transmitted through a PHS line.

  FIG. 35 shows the configuration of the radio unit and the modem unit of the portable electronic device used in the radio communication system of FIG. In order to connect to one type of uplink line and two types of downlink lines, each transmitter and receiver are integrated. The received radio signal is demodulated by the radio unit and the modem unit and transferred to the control unit and the memory. In addition, digital signals output from the control unit and the memory are transferred to the radio unit and the modem unit, and are transmitted as radio signals.

  When demodulating a radio signal, the carrier (carrier wave) and timing clock must be recovered from the received signal. FIG. 36 shows the configuration of the receiver when performing carrier recovery and timing recovery. The radio signal received by the antenna is amplified by an RF amplifier (hereinafter, the RF amplifier output is referred to as an RF signal). The carrier reproduction circuit reproduces the reference carrier from the RF signal, and the reproduced reference carrier is input to the multiplier. At the same time, an RF signal is input to the mixer and frequency conversion is performed. The output of the multiplier is input to the LPF in order to remove the image signal due to frequency conversion (hereinafter, the LPF output is referred to as a baseband signal). The timing recovery circuit recovers the timing clock from the baseband signal. Therefore, the portable electronic device used in the wireless communication system shown in FIG. 34 requires two timing recovery circuits as shown in FIG. 36 in order to receive wireless signals having two different signal transmission rates (FIG. 37). ). That is, as shown in FIG. 37, a timing recovery circuit 1 that recovers the timing clock from the baseband signal 1 and a timing recovery circuit 2 that recovers the timing clock from the baseband signal 2 are required.

  According to the present invention, the lower one of the two timing recovery circuits can be replaced by the frequency divider and phase shifter shown in FIG. 32, and the circuit configuration can be simplified. Furthermore, it becomes possible to synchronize the transmission timing of the high-speed downlink line and the PHS line.

  In the twenty-sixth embodiment, PHS is cited as an example of a wireless communication system having the same signal transmission speed, but this may be another wireless communication system such as a car phone.

  Next explained is a digital radio communication system according to the 27th embodiment of the invention. The configuration of the portable electronic device shown in FIG. 37 requires two types of carrier recovery circuits and clock recovery circuits. This can be simply expressed as shown in FIG. Carrier reproduction and timing reproduction are performed using the RF signal 1 and RF signal 2, the baseband signal 1 and the baseband signal 2, respectively. As shown in FIG. 31, according to the present invention, the circuit configuration can be simplified by replacing the other clock generation source with a frequency divider and a phase shifter. Furthermore, the present invention can be applied not only to a clock recovery circuit but also to a carrier recovery circuit. An example in which the present invention is applied to a carrier reproduction circuit is shown in FIG.

  The reference signal generation circuit shown in FIG. 39 generates a carrier and timing clock from these input signals for the RF signal 1 and RF signal 2 and baseband signal 1 and baseband signal 2 inputs, and outputs them. Alternatively, the timing clock recovery circuit recovers the carrier or the timing clock by extracting the carrier component or the clock component from the input signal using a high-selectivity (high Q) filter such as a PLL. That is, carrier recovery or timing clock recovery is performed by removing an error component of an input signal by a filter.

  In the carrier recovery circuit and the clock recovery circuit shown in FIG. 38, a carrier or timing clock is recovered from a single input signal. In the reference signal generation circuit shown in FIG. 39, a carrier or timing clock is recovered from a plurality of input signals. A plurality of error information can be obtained for reproduction. Therefore, it is possible to improve the frequency accuracy of the carrier to be reproduced or the timing clock.

  Next, a digital wireless communication system according to the twenty-eighth embodiment of the present invention is described. In the wireless communication system shown in FIG. 30 or FIG. 34, when information is transmitted from the base station to the portable electronic device or from the portable electronic device to the base station, a frame is constituted by a plurality of continuous bit signals, and is transmitted in units of frames. Perform transmission. By handling the transmission signal in units of frames, error correction, ARQ, and the like can be easily applied. FIG. 40 shows a block of a frame timing detection circuit that regenerates a frame timing clock from the demodulated bit data string. Here, the configuration of the receiver shown in FIG. 2 is assumed. The bid data string demodulated in the digital part is input to the correlator together with the bit timing clock. The correlator includes a cascade-connected D-type flip-flop (shift register) and a comparator. The comparator receives a shift register output delayed by the bit timing clock and a known signal previously inserted in the transmission signal for frame detection, and outputs a comparison result between the two. The correlator output is input to the PLL to generate a frame timing clock. In a wireless communication system having two or more types of communication systems having different signal transmission speeds and frame periods, two or more frame timing detection circuits shown in FIG. 40 are required.

  As described above, according to the present invention, the oscillation source can be replaced with a frequency divider and a phase shifter. Therefore, two or more types of frame synchronization circuits can be substituted with one type of PLL, and the circuit configuration can be simplified. It is possible to constitute a frame timing detection circuit by the collector and the phase shifter. An example in which a frame timing detection circuit is configured by a frequency divider and a phase shifter is shown in FIG.

  In FIG. 41, a demodulated bit string 1 and a bit timing clock 1 are input to a correlator 1 to detect a frame timing trigger signal. The output of the correlator 1 is input to a PLL including a phase comparator, a loop filter, a voltage controlled variable frequency oscillator, and an m-ary counter. One of the outputs of the voltage controlled variable frequency oscillator is input to the frequency divider shown in FIG. The phase shift amount of the phase shifter is controlled by the output of the correlator 2.

  Furthermore, since the frame timing can be generated by dividing the bit timing clock, the butt timing clock recovery circuit and the frame timing recovery circuit can be shared. FIG. 42 shows a clock signal generation circuit. An error signal is detected from a plurality of inputs (number of input signals i) such as an RF signal and a baseband signal, and the voltage control variable frequency oscillator is controlled. ) With the above configuration, the circuit configuration can be simplified.

  Next, a radio communication system according to the 29th embodiment of the present invention is described with reference to FIG. FIG. 43 includes a PHS base station, a wired network, and an SDL-Net base station. SDL-Net mainly performs data transmission using a high-speed downlink line compared to PHS, and performs location registration using a PHS line.

  As described above, in a system in which two or more different transmission methods are mixed, the circuit configuration can be simplified by replacing one clock recovery circuit with a frequency divider and a phase shifter. However, for this purpose, clocks of different transmission methods need to be synchronized. FIG. 43 shows a method of synchronizing the PHS line and the SDL-Net line via the network as an example. A reference signal transmitter is provided on the network side. In the PHS base station, a signal synchronized with a reference signal on the network side is generated by a synchronization circuit. When communicating with the portable electronic device, a signal is transmitted based on this synchronization signal. Similarly, in the SDL-Net base station, a signal synchronized with the reference signal on the network side is generated by the synchronization circuit, and information is transmitted to the portable electronic device based on the synchronization signal. The synchronization circuit is configured by a clock recovery circuit such as a PLL, but can also be configured by a frequency divider and a phase shifter as described above.

  Next explained is a radio communication system according to the 30th embodiment of the invention. As shown in FIG. 43 described above, in a wireless communication system including a PHS base station, a wired network, and an SDL-Net base station, it is assumed that the PHS service area and the SDL-Net service area do not match. That is, as shown in FIG. 44, the service area of SDL-Net is included in the service area of PHS. There may be a plurality of SDL-Net service areas.

  The SDL system described above includes a system having a narrowband uplink radio channel (uplink) and a wideband downlink radio channel (downlink), a narrowband upper and lower radio channels (uplink, downlink) and a wideband. Although there is a system having a downlink radio channel (downlink), since the system targeted by the present invention is the latter system, the latter system is hereinafter referred to as an SDL system. In the SDL system, in order to realize high-speed transmission in the downlink radio channel, the broadband radio base station uses a high frequency. However, since the radio frequency is severely attenuated at the high frequency, it is difficult to widen the service area. In addition, the wider the bandwidth, the greater the transmission distortion due to intersymbol interference and the greater the effect of thermal noise. Narrow. For this reason, the service area of the narrowband radio base station and the service area of the broadband radio base station have different area configurations.

  Therefore, in the SDL system, the connectable narrowband radio base station may remain the same as the radio mobile station moves, and the connectable broadband radio base station may change. It must be aware of both narrowband and broadband wireless base stations. With respect to a method for recognizing which narrowband radio base station the radio mobile station is located in, the upper and lower radio channels are prepared between the narrowband radio base station and the radio mobile station. The same procedure as that used in the mobile phone service can be used. The procedure used in the cellular phone service is that a radio base station broadcasts an identification signal indicating its own station in the downlink channel, and the radio mobile station that has received the signal transmits the signal to the radio base station via the uplink channel. To transmit an identification signal indicating its own station. This recognizes in which service area of the radio base station the radio mobile station is located.

  On the other hand, no specific technique has been described in the above description regarding the method of recognizing which broadband wireless base station the wireless mobile station is located in. Therefore, it can be said that there is no method for recognizing in which broadband wireless base station the service area of the wireless mobile station is located in the system as the object of the present invention. As described above, there is no method for recognizing which broadband mobile base station is located in the service area of the broadband wireless base station, which is indispensable for starting the provision of communication services. In addition, in a system that includes a wireless mobile station that does not have a broadband uplink wireless channel as its component, communication for providing a service cannot be started. Further, maintenance of services when a mobile station moves to a service area of another wireless base station, that is, handover cannot be performed under the situation where the service is provided.

  As shown in the conceptual diagram of FIG. 45, the radio communication system according to the thirty-first to thirty-ninth embodiments includes the broadband radio base station in which a radio mobile station 51 is notified from the broadband radio base station 52 via a radio channel. A connection optimum station interpreting means 61 for receiving a signal for identifying the station 52 and interpreting a broadband wireless base station 52 suitable for connection from the received signal; and the wireless mobile station 51 is suitable for connection Optimal base station notification means 62 for transmitting a specific broadband wireless base station 52 to the server 56 via the narrowband wireless base station 53, and the server 56 is suitable for connection to the wireless mobile station. Service starting means 63 for starting the predetermined service via the specific broadband wireless base station 52 determined to be.

  When it is necessary to perform a handover, the radio communication system according to any of the thirty-first to thirty-ninth embodiments includes, in addition to the above-described means, the specific mobile radio station suitable for connection. When the predetermined service is received via a base station, for identifying the broadband radio base station broadcast via a radio line from the broadband radio base station different from the specific broadband radio base station Means for receiving a signal and interpreting a broadband radio base station suitable as a connection switching destination from the received signal, and the specific broadband radio base station suitable for the radio mobile station as a connection switching destination, Means for communicating to the server via the narrowband wireless base station, and the server is determined to be suitable as a connection switching destination for the wireless mobile station And means for continuously provide said predetermined service by switching the connection such as through a line base station.

  According to the above configuration, the wireless mobile station that has received the signal for identifying the broadband wireless base station broadcast from the broadband wireless base station interprets the received signal, so that the broadband wireless base station suitable for connection is Determine the station. The radio mobile station uses the uplink radio channel from the radio mobile station to the narrowband radio base station to inform the narrowband radio base station which broadband radio base station it is connected to. Since the narrowband wireless base station and the server are connected via a network, the narrowband wireless base station transmits information about which broadband wireless base station the wireless mobile station is suitable for connecting to the server via the network. be able to. In this way, even if there is no uplink radio channel from the radio mobile station to the broadband radio base station, the server can recognize which broadband radio base station the radio mobile station is suitable for connection. A predetermined service can be started for a wireless mobile station via a broadband wireless base station that is determined to be suitable for connection.

  In addition, in the situation where a predetermined service is provided via any one of the broadband wireless base stations, this service maintenance is also performed when the wireless mobile station moves to the service area of another broadband wireless base station. According to the thirty-first to thirty-ninth embodiments of the present invention, a signal for identifying a broadband radio base station broadcast from a broadband radio base station via a radio channel is received, and the received signal is interpreted to establish a connection. A broadband wireless base station suitable as a switching destination is determined. The wireless mobile station then informs the server via the narrowband wireless base station which broadband wireless base station is suitable as a connection switching destination. By doing this, even if there is no uplink radio channel from the radio mobile station to the broadband radio base station, the server can recognize which broadband radio base station is suitable as a connection switching destination. The server can continuously provide a predetermined service by switching the connection to the wireless mobile station via a broadband wireless base station determined to be suitable as a connection switching destination.

  First, the configuration of the wireless communication system targeted by the 31st to 39th embodiments of the present invention will be described. FIG. 46 is a conceptual diagram showing the configuration of the system according to the present invention. In FIG. 46, 51 is a wireless mobile station, 52 and 53 are wireless base stations, 56 is a data server, and 57 is a network. The radio base station 52 has a transmission means for performing broadband information transmission (hereinafter referred to as a broadband radio base station 52). On the other hand, the radio base station 53 has transmission / reception means for performing narrowband information transmission (hereinafter referred to as a narrowband radio base station 53). The wireless mobile station 51 is a terminal that performs information transmission with the broadband wireless base station 52 or the narrowband wireless base station 53. A wireless channel between the broadband wireless base station 52 and the wireless mobile station 51 is called a broadband wireless channel, and a wireless channel between the narrowband wireless base station 53 and the wireless mobile station 51 is narrowband. Called the radio channel.

  In FIG. 46, for convenience, the broadband wireless base station 52 and the narrowband wireless base station 53 are distinguished, but as shown in FIG. 47, one wireless base station 58 performs transmission / reception for narrowband information transmission. It is also possible to provide both the means and the transmission means for broadband information transmission. In this case, although the cost of the radio base station 58 is increased, the total number of radio base stations in the entire system can be reduced. Further, when it is necessary to perform control between transmission / reception means for narrowband information transmission and transmission means for wideband information transmission, the control becomes easy. Hereinafter, the 31st to 39th embodiments of the present invention will be described with reference to FIG. 46 in which the broadband wireless base station 52 and the narrowband wireless base station 53 are different wireless base stations.

  Thirty-first embodiment: In the thirty-first embodiment, when the wireless mobile station 51 is located in the area shown in FIG. 48 (a), that is, when the wireless mobile station 51 can be connected to the broadband wireless base station 52, A procedure for starting wireless communication will be described. FIG. 49 shows the most basic flowchart according to the 31st embodiment. In step ST1, it is interpreted which broadband wireless base station 52 is located in the service area of the wireless mobile station 51. In step ST2, the information interpreted in step ST1 is transmitted to the server 56 via the narrowband radio base station 53. As a result, the data server 56 can recognize which broadband wireless base station 52 the wireless mobile station 51 is located in. In step ST3, provision of service to the wireless mobile station 51 via the broadband wireless base station 52 interpreted in step ST1 is started. Further, when the service is actually started, various procedures based on the above-described flowchart can be considered, and an example is shown in FIG. In step ST11, the broadband wireless base station 52 in which the wireless mobile station 51 is located is interpreted. In step ST12, it is determined whether there is a service request from the user. If there is a service request from the user, the process proceeds to step ST13, and if there is no request, step ST11 is repeated. In step ST13, it is selected whether or not to receive a service using a broadband downlink radio channel. If the service is received using the broadband downlink radio channel, the process proceeds to step ST14. If not, the process proceeds to step ST16. In step ST14, the information interpreted in step ST11 is transmitted to the server 56 via the narrowband radio base station 53. In step ST15, provision of service to the wireless mobile station 51 via the broadband wireless base station 52 interpreted in step ST11 is started. On the other hand, if it is selected in step ST13 not to receive a service using a wideband downlink radio channel, that is, if it is selected to receive a service using a narrowband downlink radio channel, in step ST16, wireless movement is performed. The station 51 informs the server 56 that a narrowband downlink radio channel is used as the downlink channel. In step ST <b> 17, provision of service to the wireless mobile station 51 via the narrowband wireless base station 53 is started.

  In the thirty-first embodiment, step ST14 is shown when receiving a service using a broadband downlink radio channel in step ST13. However, step ST14 is a service after step ST11. It may be performed regardless of whether there is a request. That is, even if there is no service request from the user, the information interpreted in step ST11 may be transmitted to the server 56 via the narrowband radio base station 53. In this case, the server 56 can recognize in which service area of the broadband wireless base station 52 the wireless mobile station 51 is located regardless of whether there is a service request from the user. There is also a procedure for performing step ST12 before step ST11, that is, performing step ST11 and subsequent steps only when there is a service request from the user. In this case, when there is no request from the user, the wireless mobile station 51 does not have to interpret which broadband wireless base station 52 is located in the service area of the broadband wireless base station 52, thereby reducing power consumption. In order to further reduce power consumption, it is also possible to turn off the power of the receiving means for broadband information transmission.

  Next, with reference to FIG. 51, a sequence diagram of a communication start procedure of the radio communication system according to the thirty-first embodiment is described. The mobile radio station 51 receives the signal 511 for identifying the radio base station broadcast from the broadband radio base station 52, and the mobile station 51 is located within the service area of the broadband radio base station 52 from which the received mobile station is located. Can be determined. When a service request occurs under such circumstances, the user dials up a server-specific telephone number 510 and acquires a communication line from the wireless mobile station 51 to the server 56 via the narrowband wireless base station 53. To do. After the communication line from the wireless mobile station 51 to the server 56 is acquired, the wireless mobile station 51 sends a data transmission request message 202 and a signal 513 for identifying the broadband wireless base station 52 to which the local station can be connected to the server 56. To transmit. The server 56 interprets the data request message 512 and the signal 513 transmitted from the user, and transmits information 514 requested by the user via the broadband wireless base station 52 designated by the signal 513.

  Thirty-second embodiment: The thirty-second embodiment is a procedure for starting wireless communication when the wireless mobile station 51 is located in the area shown in FIG. 48B, that is, when it cannot connect to the broadband wireless base station 52. Will be explained. FIG. 52 shows the most basic flowchart according to this embodiment. In step ST21, it is interpreted that the wireless mobile station 51 is not located within the service area of the broadband wireless base station 52, that is, cannot be connected to the broadband wireless base station 52. In step ST22, the radio mobile station 51 informs the server 56 via the narrowband radio base station 53 that a narrowband downlink radio channel is used as the downlink channel. In step ST23, provision of service to the wireless mobile station 51 via the narrowband wireless base station 53 is started. When starting a service, various procedures based on the above-described flowchart can be considered.

  An example is shown in FIG. In step ST31, it is interpreted that the wireless mobile station 51 is not located within the service area of the broadband wireless base station 52, that is, cannot be connected to the broadband wireless base station 52. In step ST32, it is determined whether or not there is a service request using a narrowband downlink radio channel. If there is a service request from the user, the process proceeds to step ST33, and if there is no service request, step ST31 is repeated. In step ST33, the radio mobile station 51 informs the server 56 via the narrowband radio base station 53 that a narrowband downlink radio channel is used as the downlink channel. In step ST34, provision of service to the wireless mobile station 51 via the narrowband wireless base station 53 is started. In the above embodiment, after interpreting that the mobile radio station 51 cannot be connected to the broadband radio base station 52 in step ST31, that is, after determining whether or not the radio mobile station 51 can be connected to the broadband radio base station 52, in step ST32 Although the example in which the presence / absence of the service request from the user is determined has been shown, step ST31 may be performed after the presence / absence of the request from the user is determined as shown in the thirty-first embodiment.

  Next, a sequence diagram of a communication start procedure in the thirty-second embodiment will be described with reference to FIG. The wireless mobile station 51 cannot receive the signal 541 for identifying the wireless base station broadcast from the broadband wireless base station 52. Even if it can be received, the signal strength necessary and sufficient for providing the service cannot be obtained. Accordingly, the wireless mobile station 51 interprets that the mobile station 51 is located outside the service area of the broadband wireless base station. That is, the wireless mobile station 51 recognizes that it can only receive services using a narrowband downlink wireless channel. In such a case, the user selects whether or not to receive a service using a narrowband downlink radio channel. When receiving a service using a narrow-band downlink radio channel, the user dials up 540 a server-specific telephone number and acquires a communication line from the radio mobile station 51 to the server 56 via the narrow-band radio base station 53. . After the communication line from the wireless mobile station 51 to the server 56 is acquired, the wireless mobile station 51 sends a data transmission request message 542 and a signal 543 for identifying the narrowband wireless base station 53 to which the local station can be connected to the server. To transmit. Normally, the narrowband radio base station 53 used in the downlink radio channel is the same as the narrowband radio base station 53 used in the uplink radio channel, so that the signal 543 cannot use the broadband downlink radio channel. Information that only conveys to 56 may be sufficient. The server 56 interprets the data request message 542 and the signal 543 transmitted from the user, and passes through the narrowband radio base station 53 specified by the signal 543 or the narrowband radio base station 53 used in the uplink radio channel. Then, information 544 requested by the user is transmitted.

  Next, in the following thirty-third to thirty-sixth embodiments, procedures relating to handover will be described. The handover handled in these embodiments is limited to the handover that occurs when the wireless mobile station 51 moves within the service area of a specific narrow band wireless base station 53. This is because the narrowband radio base station 53 has upper and lower radio channels, so that the handover between the narrowband radio base stations 53 can sufficiently cope with the conventional handover procedure. Since the procedure for starting communication is shown in the thirty-first and thirty-second embodiments, in the thirty-third to thirty-sixth embodiments, the handover procedure after the service is provided will be described.

  Thirty-third embodiment: In the thirty-third embodiment, the radio mobile station 51 moves as shown in FIG. 48C, that is, the radio mobile station 51 is within the service area of the broadband radio base station 52. A handover procedure when moving into the service area of another broadband wireless base station 52 while receiving a service will be described.

  FIG. 55 shows the most basic flowchart relating to the present embodiment. In step ST41, it is determined whether or not the radio mobile station 51 can receive a signal broadcast from a broadband radio base station 52 different from the broadband radio base station 52 providing the service. If reception is possible, a comparison is made between the received electric field strength of the signal and the received electric field strength of the signal transmitted from the broadband wireless base station 52 that currently provides the service. 51 interprets the broadband wireless base station 52 that is the handover destination. Therefore, when the received electric field strength of the signal transmitted from the broadband wireless base station 52 that currently provides the service is sufficient, the service is continued without switching the wireless base station. In addition, the scale for selecting whether or not to switch the connection varies depending on the communication quality required by the service provided. For example, in the case of a voice communication service, since the requested communication quality is not so high, even if the communication quality is slightly deteriorated as the wireless mobile station 51 moves, the wireless base station is not switched. On the other hand, in the case of the data communication service, the required communication quality is higher than that of the voice communication service, and therefore, the radio base station is switched so that the communication quality is improved as much as possible. In step ST42, the information interpreted in step ST41 is transmitted to the server 56 via the narrowband radio base station 53. As a result, the server 56 can recognize the broadband wireless base station 52 as the handover destination. In step ST43, the service is continuously provided by switching the connection through the broadband wireless base station determined to be the handover destination.

  Next, the sequence diagram of the handover in the thirty-third embodiment will be described with reference to FIG. When the wireless mobile station 51 moves as shown in FIG. 48 (c), the signal strength at the time of reception of the information data 565 transmitted from the broadband wireless base station 52 deteriorates, so that the information cannot be received correctly. . On the other hand, since the wireless mobile station 51 has moved into the service area of the other broadband wireless base station 52, it can receive the signal 566 for identifying the wireless base station broadcast from the other broadband wireless base station 52. Thus, it can be determined from the received signal to which broadband wireless base station 52 the service area of the own station is moving. The wireless mobile station 51 determines whether or not to perform handover based on the relationship between the signal strengths when the information signal 565 and the signal 566 are received. If it is not necessary to perform a handover, the reception of the information data 565 is continued as it is.

  When it is necessary to perform a handover, the radio mobile station 51 transmits a handover request message 567 and a signal 558 for identifying the handover destination broadband radio base station 52 to the server 56. When the server 56 interprets the handover request message 567 and the signal 568, the server 56 sends a line disconnection request message 569 to the broadband wireless base station 52 in communication. After the line is disconnected, the server transmits information data 570 via the broadband wireless base station 52 designated by the signal 568. Thereby, even when the service area changes due to movement, the user can continue to receive the provided service.

  Thirty-fourth embodiment: In the thirty-fourth embodiment, the wireless mobile station 51 moves as shown in FIG. 48 (d), that is, the wireless mobile station 51 is within the service area of the broadband wireless base station 52. A handover procedure when moving outside the service area of the broadband wireless base station 52 while receiving a service will be described with reference to FIG. Since the wireless mobile station 51 is moving out of the service area of the broadband wireless base station 52, the received electric field strength of the signal transmitted from the broadband wireless base station 52 that currently provides the service deteriorates. In addition, a signal broadcast from a broadband radio base station 52 different from the broadband radio base station 52 providing the service cannot be received. Therefore, in step ST51, the radio mobile station 51 interprets that it cannot connect to the broadband radio base station 52. In step ST52, the mobile radio station 51 indicates that the mobile station 51 cannot connect to the broadband radio base station 52, that is, performs transmission via the narrowband radio base station 53 as downlink channel transmission. To the server 56 via In step ST53, the server 56 switches the connection through the narrowband radio base station 53 and continuously provides the service.

  Further, in the above-described embodiment, when the wireless mobile station 51 becomes unable to connect to the broadband wireless base station 52 while receiving a predetermined service, it is assumed that the connection is switched to the connection via the narrowband wireless base station 53. However, as the next step of step ST51, a step of selecting whether to continue the service provided using the narrowband downlink radio channel or to stop the provided service is shown. May be added. If continuation of service is selected, the process proceeds to step ST52. The case of selecting the service stop will be described in detail in the 35th embodiment.

  Next, a handover sequence diagram according to the 34th embodiment will be described with reference to FIG. When the wireless mobile station 51 moves as shown in FIG. 48 (d), the signal strength at the time of reception of the information data 585 transmitted from the broadband wireless base station 52 deteriorates, so that the information cannot be received correctly. . On the other hand, since the wireless mobile station 51 is moving out of the service area of the broadband wireless base station 52, the wireless mobile station 51 receives the signal 586 for identifying the wireless base station broadcast from the other broadband wireless base station 52. I can't. Even if it can be received, sufficient signal strength necessary for providing the service cannot be obtained. Therefore, the wireless mobile station 51 interprets that the own station is located outside the service area of the broadband wireless base station 52. That is, the wireless mobile station 51 recognizes that it can only receive services using a narrowband downlink wireless channel. Therefore, the connection is switched to the narrowband downlink radio channel and the provided service is continued by the following procedure. The wireless mobile station 51 transmits a handover request message 587 and a signal 588 for identifying the handover target narrowband wireless base station 53 to the server 56.

  Normally, the narrowband radio base station 53 used in the downlink radio channel is the same as the narrowband radio base station 53 used in the uplink radio channel, so that the signal 588 cannot use the broadband downlink radio channel. Information that only conveys to 56 may be sufficient. When the server 56 interprets the handover request message 587 and the signal 588, the server 56 sends a line disconnection request message 589 to the broadband wireless base station 52 in communication. After the line is disconnected, the server 56 transmits the information 590 requested by the user via the narrowband radio base station 53 specified by the signal 588 or the narrowband radio base station 53 used in the uplink radio channel. To transmit. Thereby, even when the service area changes due to movement, the user can continue to receive the provided service.

  Thirty-fifth embodiment: In the thirty-fifth embodiment, the radio mobile station 51 moves as shown in FIG. 48 (d), that is, the radio mobile station 51 is within the service area of the broadband radio base station 52. The procedure for stopping the service when moving outside the service area of the broadband wireless base station 52 when receiving the service, that is, the procedure for disconnecting the line will be described with reference to FIG.

  Since the wireless mobile station 51 is moving out of the service area of the broadband wireless base station 52, the received electric field strength of the signal transmitted from the broadband wireless base station 52 that currently provides the service deteriorates. In addition, a signal broadcast from a broadband radio base station 52 different from the broadband radio base station 52 providing the service cannot be received. Therefore, in step ST61, it is interpreted that the wireless mobile station 51 cannot connect to the broadband wireless base station 52. In step ST62, the wireless mobile station 51 cannot connect to the broadband wireless base station 52, that is, the wireless mobile station 51 stops the service provided by the server 56 via the narrowband wireless base station 53. To tell. In step ST63, the server 56 stops the provided service and disconnects the communication line from the broadband wireless base station 52 to the wireless mobile station 51. Further, as described in the thirty-fourth embodiment, the step of selecting whether to continue the service provided by using the narrow band downlink radio channel or to stop the provided service. In step ST61, if it is selected to stop the provided service, the process proceeds to step ST62.

  Next, with reference to FIG. 60, a sequence diagram of handover in the 35th embodiment will be described. When the wireless mobile station 51 moves as shown in FIG. 48 (d), the signal strength at the time of receiving the information data 605 transmitted from the broadband wireless base station 52 deteriorates, so that the information cannot be received correctly. . On the other hand, since the wireless mobile station 51 is moving out of the service area of the broadband wireless base station 52, the wireless mobile station 51 receives the signal 606 for identifying the wireless base station broadcast from the other broadband wireless base station 52. I can't. Even if it can be received, sufficient signal strength necessary for providing the service cannot be obtained. Therefore, the wireless mobile station 51 interprets that the own station is located outside the service area of the broadband wireless base station 52. That is, the wireless mobile station 51 recognizes that it cannot receive a service using a broadband downlink wireless channel. Therefore, a procedure for stopping the provided service is executed. The wireless mobile station 51 transmits a communication disconnection request message 607 to the server 56. When the server 56 interprets the communication disconnection request message 607, the server 56 transmits a line disconnection message 608 to the wireless mobile station 51 via the broadband wireless base station 52 in communication. As a result, when the wireless mobile station 51 moves away from the service area, the provided service can be promptly stopped at the user's will.

  Thirty-sixth embodiment: In the present embodiment, the wireless mobile station 51 moves as shown in FIG. 48 (e), that is, the wireless mobile station 51 is outside the service area of the broadband wireless base station 52. A handover procedure when moving into the service area of the broadband wireless base station 52 while receiving a service using the downlink wireless channel of the band will be described with reference to FIG.

  The wireless mobile station 51 can receive a signal for identifying the wireless base station broadcast from the broadband wireless base station 52 as it moves. Therefore, in step ST71, the wireless mobile station 51 interprets to which service area of the broadband wireless base station 52 the own station is moving. In step ST72, the information interpreted in step ST71 is transmitted to the server 56 via the narrowband radio base station 53. Thus, the server 56 can recognize which broadband wireless base station 52 the wireless mobile station 51 is moving into. In step ST73, the connection is switched through the broadband wireless base station 52 interpreted in step ST71, and the service is continuously provided. By the way, in order to perform such handover, the wireless mobile station 51 always waits to receive a signal broadcasted by the broadband wireless base station 52 even when the wireless mobile station 51 uses a narrowband wireless channel. It must be in a state. This is because when entering the service area of the broadband wireless base station 52, handover may be performed even if the signal reception state through the narrowband wireless base station 53 is good.

  In the above-described embodiment, the example in which the handover is immediately performed when the mobile radio station 51 can be interpreted in the service area of the broadband wireless base station 52 in step ST71 has been described. The user may add a step of selecting whether or not to perform a handover. This is because, as described above, the signal reception state via the narrowband radio base station 53 is not necessarily in a bad state, and in the case of a service that does not require high-speed transmission, such as a voice communication service, This is because there is no need for over. There are three places where this step is added, each having the following characteristics. First, when this step is added after step ST72, the server 56 recognizes in which broadband wireless base station 52 the wireless mobile station 51 is located, regardless of whether or not handover is performed. it can. Next, when this step is added after step ST71, when the handover is not performed, the broadband mobile base station 52 does not tell the server which broadband wireless base station 52 is located in the service area. The amount of traffic between the wireless mobile station 51 and the server 56 is reduced. Finally, when this step is added before step ST71, the radio mobile station 51 does not have to interpret in which broadband wireless base station 52 the mobile station 51 is located, and thus power consumption is reduced. Is done. In this case, it is possible to further reduce power consumption by turning off the power of the receiving means for broadband information transmission.

  Next, a handover sequence diagram in the system of the sixth embodiment will be described with reference to FIG. When the wireless mobile station 51 moves as shown in FIG. 48 (e), the wireless mobile station 51 can receive the signal 625 for identifying the wireless base station broadcast from the broadband wireless base station 52. From the received signal, it can be determined to which broadband wireless base station 52 the service area of the own station is moving. At this time, as described above, the signal strength of the information data 624 received by the wireless mobile station 51 is not necessarily bad. Therefore, the selection as to whether or not to perform handover is made at the user's will. Alternatively, it is set in advance whether to perform handover when entering the service area of the broadband wireless base station 52. When it is set not to perform handover, the wireless mobile station 51 may turn off the power of the receiver for broadband information transmission. When handover is not performed when the wireless mobile station 51 enters the service area of the broadband wireless base station 52, reception of the information data 624 is continued via the narrowband wireless base station 53 as it is.

  When performing a handover, the radio mobile station 51 transmits a handover request message 626 and a signal 627 for identifying the handover destination broadband radio base station 52 to the server 56. When the server 56 interprets the handover request message 626 and the signal 627, the server 56 sends a downlink radio channel disconnection message 628 to the communicating narrowband radio base station 53. After the line is disconnected, the server 56 transmits the information data 629 via the broadband wireless base station 52 designated by the signal 627. As a result, the user can continue to receive the provided service even when the service area changes due to movement.

  Thirty-seventh embodiment: A unique logical number is assigned to the server 56. The logical number when there are a plurality of servers on the network is one for all servers. When a user wants to receive a service, the user makes a call to the server 56. There are two methods for making a call: a method in which a user directly dials up a logical number (FIG. 63A), and a method in which a user selects an item of an SDL service displayed on the wireless mobile station 51 (FIG. 63 ( b)). Here, the SDL service refers to a service provided using the SDL system. In the case of this method, the SDL service item is associated with the logical number, and when the user selects the SDL service item, dial-up is automatically performed. In any method, when a call is made to the server 56, a communication line from the wireless mobile station 51 to the narrowband wireless base station 53 is first acquired.

  Next, the narrowband radio base station 53 connects to the server 56. When there is only one server 56 on the network 57, a communication line from the narrowband radio base station 53 to the server 56 is acquired. If there are a plurality of servers 56 on the network 57, the server 56 to which the narrowband radio base station 53 is connected is selected. There are four selection methods.

  First, there is a method in which each narrowband radio base station 53 recognizes a server 56 to which the local station should be connected in advance and always selects the server 56. Usually, the server 56 to be connected is adjacent to the narrowband radio base station 53. Second, there is a method of selecting a server 56 with a light load on the server 56. In this method, the wireless base station 53 having a narrow band observes the load on the server 56 and selects the server 56 having a small load. Third, there is a method of selecting a server 56 with a light load on the network 57. This method is a method of trying to use a communication path between the narrowband radio base station 53 and the server 56 with less traffic. Moreover, as a 4th method, the method of combining at least 2 or more methods from said 3 methods is mentioned. As this method, for example, the narrowband radio base station 53 observes the load of the server 56 and selects the server 56 closest to the narrowband radio base station 53 from among the servers 56 whose load is smaller than a certain value. There are methods. After the server 56 is selected using the selection method as described above, a communication line from the narrowband radio base station 53 to the server 56 is acquired, whereby a communication line from the wireless mobile station 51 to the server 56 is acquired. Is earned.

  Thirty-eighth embodiment: As shown in FIG. 63 (c), a specific logical number is assigned to each service, and the user makes a call with the logical number corresponding to the service he wants to receive. There are two methods for making a call: a method in which the user directly dials up a logical number, and a method in which the user selects a service item displayed on the wireless mobile station 51. This method will be described as a system according to the 38th embodiment. In this method, when a user selects one service, the corresponding logical number is automatically dialed up. In any method, when a call is made to the server 56, first, a communication line from the radio mobile station 51 to the narrowband radio base station 53 is acquired.

  Next, the narrowband radio base station 53 connects to the server 56. When there is only one server 56 that provides the desired service on the network 57, a communication line from the narrowband radio base station 53 to the server 56 is acquired. When there are a plurality of servers 56 that provide a desired service on the network 57, the server 56 to which the narrowband radio base station 53 is connected is selected. Since the selection method is the same as in the following 39th embodiment, it is omitted here. When the server 56 is selected, a communication line from the narrowband wireless base station 53 to the server 56 is acquired, and thereby a communication line from the wireless mobile station 51 to the server 56 is acquired.

  Thirty-ninth embodiment: The radio mobile station 51 displays whether it can communicate with the radio base station. Specifically, it displays both whether or not the own station can communicate with the narrowband radio base station 53 and whether or not the own station can communicate with the broadband radio base station 52. As a display method, a method of displaying the signal intensity of the radio wave from each base station in a stepwise manner (FIG. 64 (a)) or a method of binaryly displaying whether communication is possible (FIG. 64 (b)). and so on. Further, in order to perform the above-described display, the wireless mobile station 51 measures the received electric field strength when receiving a signal transmitted from the broadband wireless base station 52, and displays the measurement result in a representation method that can be recognized by a human. And means for measuring the received electric field strength when a signal transmitted from the narrowband radio base station 53 is received and displaying the measurement result in a representation method that can be recognized by a human.

  According to the 39th embodiment, the user can recognize what kind of service he can receive. In other words, a user can receive a service using a narrow-band downlink radio channel but cannot recognize a service using a wide-band downlink radio channel. It becomes possible to recognize that it is possible to receive a service using a channel. Therefore, for example, when the user is located outside the service area of the broadband wireless base station 52, the broadband downlink radio channel is used after moving into the service area of the broadband wireless base station 52 without receiving service at the local point. It is possible to select at a user's will either the high-speed wireless transmission service or the low-speed wireless transmission service using the narrow-band downlink wireless channel at the present time. Further, two steps related to the signal transmitted from the broadband wireless base station 52 (when the wireless mobile station 51 receives the first signal transmitted from the broadband wireless base station 52 via the wireless channel, the first signal The step of measuring the received electric field strength, the step of displaying the received electric field strength of the first signal by a representation method that can be recognized by humans, and the following two steps (wireless) for the signal transmitted from the narrowband radio base station 53 When the mobile station 51 receives a second signal transmitted from a narrowband radio base station via a radio channel, a step of measuring a received electric field strength of the second signal, and a received electric field of the second signal The step of displaying the intensity in a representation method that can be recognized by humans is an independent step. Therefore, if the user has previously set that the wireless mobile station 51 does not receive the high-speed transmission service via the broadband wireless base station 52, two steps relating to the signal transmitted from the broadband wireless base station 52 are performed. There is a method that does not. In this case, the power consumption of the wireless mobile station 51 can be reduced.

  As described above, according to the thirty-first to thirty-ninth embodiments of the present invention, even if the system includes a wireless mobile station that does not have a broadband uplink wireless channel, such as an SDL system, as a component, It is possible to recognize which broadband wireless base station the station can connect to, and to provide a service. In addition, even when it is necessary to perform handover due to the movement of a radio mobile station, the server can recognize the broadband radio base station that is the handover destination and can continue to provide services. It becomes possible.

  FIG. 65 shows a wireless communication system according to the 40th embodiment, which includes a PHS base station, a wired network, and an SDL-Net base station, as in FIG. FIG. 43 is different from FIG. 43 in that the SDL-Net base station is equipped with a PHS receiver and that there is no reference transmitter on the network side. As shown in FIG. 44, the SDL-Net base station exists inside the PHS service area. Therefore, it is possible to synchronize the PHS and SDL-Net clocks by inputting the signal received by the PHS receiver to the synchronization circuit.

  FIG. 66 shows a forty-first embodiment as an overall configuration to which the wireless communication system according to the present invention is applied. A plurality of base stations BS having a predetermined communication service area, a plurality of databases, and a communication satellite CS are communicably connected via a network.

The block diagram which shows the basic concept of this invention. 1 is a block diagram showing a wireless communication system according to a first embodiment of the present invention. The block diagram which shows the radio | wireless communications system by 2nd Example of this invention. Explanatory drawing which shows the radio | wireless communications system by 3rd Example of this invention. The block diagram which shows the radio | wireless communications system by 4th Example of this invention. Explanatory drawing which shows an example of a communication form. Explanatory drawing which shows another example of a communication form. The block diagram which shows the other structural example of the basic concept of this invention. The block diagram which shows the structure of 5 Example of this invention. The figure which shows one Example which shows the utilization condition of the memory space in the Example of FIG. The block diagram which shows an example of the SDL system which does not apply this invention. The figure which shows the frequency arrangement | positioning of a radio | wireless communications system. The conceptual diagram which shows the radio | wireless communications system by the 13th Example of this invention. The figure which shows the frequency arrangement | positioning in the 13th Example of this invention. The conceptual diagram which shows the radio | wireless communications system by 14th Example of this invention. The figure which shows the frequency arrangement | positioning in 14th Example of this invention. The conceptual diagram which shows the radio | wireless communications system by 15th Example of this invention. The figure which shows the frequency arrangement | positioning in 15th Example of this invention. The conceptual diagram which shows the radio | wireless communications system by the 16th Example of this invention. The figure which shows the frequency arrangement | positioning in the 16th Example of this invention. The block diagram which shows the radio | wireless communications system by the 17th Example of this invention. The block diagram which shows the radio | wireless communications system by the 18th Example of this invention. The block diagram which shows the radio | wireless communications system by the 19th Example of this invention. The block diagram which shows the radio | wireless communications system by 20th Example of this invention. The block diagram which shows the radio | wireless communications system by the 21st Example of this invention. The block diagram which shows the radio | wireless communications system by the 22nd Example of this invention. The block diagram which shows the radio | wireless communications system by the 23rd Example of this invention. The block diagram which shows the radio | wireless communications system by the 24th Example of this invention. The block diagram which shows the radio | wireless communications system by the 24th Example of this invention. The figure which showed the service area of the radio | wireless communications system by 25th Example of this invention. The figure which shows operation | movement of the portable electronic device used with the radio | wireless communications system by 25th Example of this invention. The figure which shows the structure of the frequency divider in 25th Example of this invention. The figure which shows the structure of the portable electronic device used with the radio | wireless communications system by 26th Example of this invention. The figure which shows the service area of the radio | wireless communications system by 26th Example of this invention. The figure which shows the structure of the receiver which a timing clock reproduction circuit comprises. The figure which shows the structure of the receiver for comprising the timing clock reproduction | regeneration circuit in 26th Example of this invention. The figure which shows the input-output signal of the carrier reproduction | regeneration and timing reproduction | regeneration circuit in 27th Example of this invention. The figure which shows the input-output signal of the reference signal generation circuit in 27th Example. The figure which shows a structure of a frame timing clock reproduction circuit. The figure which shows the structure of the frame timing clock reproduction circuit in the 28th Example of this invention. The figure which shows the structure of a clock reproduction circuit. The figure which shows the structure of the clock synchronization circuit in 29th Example of this invention. The figure which shows the structure of the radio | wireless communications system which concerns on 30th Example. The figure which shows the structure of the clock synchronization circuit in 30th Example of this invention. The block diagram which shows the general concept of the radio | wireless communications system based on 31-39 Example of this invention. The figure which shows the whole structure of the radio | wireless communications system based on 31st-39th Example of this invention. The figure which shows the other whole structure of the radio | wireless communications system of 31st-39th Example of this invention. The figure which shows the mode of the movement of the radio | wireless mobile station in the radio | wireless communications system which concerns on 31st-36th Example of this invention, respectively. The flowchart which shows the process stener of the radio | wireless communications system based on 31st Example of this invention. The flowchart which shows the process step of the service start in the radio | wireless communications system based on 31st Example of this invention. The sequence diagram which shows the communication start procedure of the radio | wireless communications system which concerns on 31st Example of this invention. The flowchart which shows the process step of the radio | wireless communications system which concerns on 32nd Example of this invention. The flowchart which shows the process step of the service start in the radio | wireless communications system based on 32nd Example of this invention. The sequence diagram which shows the communication start procedure of the radio | wireless communications system which concerns on 32nd Example of this invention. The flowchart which shows the process step of the radio | wireless communications system based on 33rd Example of this invention. The sequence diagram which shows the communication start procedure of the radio | wireless communications system which concerns on 33rd Example of this invention. The flowchart which shows the process step of the radio | wireless communications system which concerns on 34th Example of this invention. The sequence diagram which shows the communication start procedure of the radio | wireless communications system which concerns on 34th Example of this invention. The flowchart which shows the process step of the radio | wireless communication system which concerns on 35th Example of this invention. The sequence diagram which shows the communication start procedure of the radio | wireless communications system which concerns on 35th Example of this invention. The flowchart which shows the process step of the radio | wireless communications system which concerns on 36th Example of this invention. The sequence diagram which shows the communication start procedure of the radio | wireless communications system which concerns on 36th Example of this invention. (A) And (b) is a top view which respectively shows the radio | wireless mobile station used for the radio | wireless communications system which concerns on 37th Example of this invention, (c) is a radio | wireless mobile station used for the system which concerns on 38th Example. FIG. (A) And (b) is a top view which each shows the radio | wireless mobile station used for the radio | wireless communications system based on 39th Example of this invention. The figure which shows the structure of the radio | wireless communications system based on 40th Example of this invention. The figure which shows the structure of the radio | wireless communications system based on 41st Example of this invention. The figure which showed the structure of the conventional PLL. The figure which shows the frequency arrangement | positioning of the conventional radio | wireless referee system.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Terminal 2 Low-speed transmission means 3 High-speed reception means 4 Uplink line 5 Base station 6 Low-speed reception means 7 High-speed transmission means 101,103 Radio | wireless apparatus 501,701,1301,1401,1501,1601,1701 502, 702, 1302, 1402, 1502, 1602, 1702 Wireless terminals 901, 903 Antennas 902, 1002, 1004, 1102, 1203, 1304, 1605, 1606, 1608 Receivers 904, 1005, 1101, 1201, 1306, 1603 1604 1607 Transmitter 1303 Infrared Transmitter 1305 Infrared Receiver

Claims (1)

In a wireless communication method for performing wireless communication between a wireless terminal and one or more wireless base stations,
Using a first wireless transmission band that uses radio waves in a first frequency band, a first transmission is performed between a terminal transmission unit provided in the wireless terminal and one or more base station reception units of the base station. Wireless communication
Base station transmission of any one or more of the radio base stations using a second radio transmission band faster than the first radio transmission band using radio waves in a second frequency band higher than the first frequency band A second wireless communication is performed between the means and the terminal receiving means of the wireless terminal.

Images