JP3280830B2 - Wireless communication system and wireless communication base station - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a radio communication system, and more particularly, to a radio transmission system from a base station to a terminal compared with a downlink transmission speed which is a radio transmission channel from a terminal to a base station. The present invention relates to a radio communication system for performing super high speed downlink (hereinafter, referred to as SDL) transmission in which the transmission speed of a link is relatively high.

[0002]

2. Description of the Related Art In recent years, with the progress of communication and information processing technology, personal handyphone systems (Personal Handyphone) have been developed.
Various systems have been proposed for wireless communication systems such as System-, hereinafter referred to as PHS-) and the SDL system.

[0003] The demand for wireless communication systems such as PHS and wireless local area networks (Local Area Network-LAN-) has been increasing due to the development of various information media. The need to perform wireless communication is also increasing. In view of such necessity, there is a demand in the field of wireless communication systems for a wider transmission wave frequency as in a wired communication system. Further, in a conventional wireless communication system, an uplink that is a line that transmits a radio signal from a terminal to a base station, and a downlink line that is a line that transmits a radio signal from a base station to a terminal,
In this case, two-way wireless communication is performed by matching the transmission speeds of the two. However, at present, the transmission amount of the downlink for transmitting the user information requested by the user to the terminal is considerably larger than the transmission amount of the uplink for transmitting only the control information and the like.

[0004] This is a common problem not only in mobile communication but also in wireless LAN and various other wireless services. However, since frequency resources are limited in radio, it is difficult to widen the bandwidth in the currently served frequency band, and higher unused frequencies (quasi-millimeter wave / millimeter wave band)
It is hoped that pioneering will be developed.

FIG. 67 shows an example of a conventional frequency arrangement. Japanese digital car telephone system RCR STD-
27B (Research Center of Radio System STanDard 2
7B-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 the radio frequency band is 800
There are systems for the MHz band and the 1.5 GHz band. In both frequency bands, the uplink and the downlink are configured with the same frequency band. 810M in 800MHz band
From 940 MHz to 826 MHz
The uplink is located at 956 MHz. In a conventional system, transmission and reception are performed in the same frequency band because a downlink and an uplink having the same transmission speed are assumed. However, a problem occurs when application to an SDL system is considered.

[0006] Since a wideband downlink is assumed in the SDL system, it is difficult to realize a low frequency band such as the 800 MHz band in terms of securing a wide bandwidth and effectively using the frequency. For example, when trying to transmit about 100 MHz, one
It may be said that it is impossible to secure a band of 00 MHz. For this reason, from a quasi-millimeter wave band of about several GHz to several tens of GH
Transmission in a millimeter wave band of about z is required.

On the other hand, as a conventional example of a wireless communication system having different transmission systems, there is an automobile telephone in the United States. This means that during the transition from analog to digital, handsets for car phones will be replaced by analog machines (analog car phones) and digital machines (digital car phones).
Coexist and can be transmitted and received in both areas. In this system, completely different communication systems, analog and digital, are used, and the transceiver has a small number of common circuit parts, and is configured to have one analog car phone and one digital car phone. Therefore, there is a problem that the circuit scale becomes large.

Next, a conventional example of a method of synchronizing with a reference signal source will be described with reference to FIG. Fig. 68
Is a phase locked loop for obtaining a frequency n / m times the oscillation frequency x of the reference oscillator.
oop-PLL-) 680. The frequency of the signal of the oscillation frequency x is reduced to 1 / m by the frequency divider 681,
Input to the phase comparator. Further, the frequency of the signal of the voltage controlled variable frequency oscillator (oscillation frequency y) is reduced to 1 / n by the frequency divider 682 and input to the phase comparator 683. 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 characteristics of PLL 680. The output of the loop filter 684 is input to a voltage controlled variable frequency oscillator (VCO) 685. PLL 680 is controlled such that the phase difference between the two signals at the input of phase comparator 683 becomes zero. Therefore, the following equation (1) holds.

X / m = y / n (1) Therefore, the output y of the voltage controlled variable frequency oscillator is y = xn / m (2). As described above, the oscillation frequency becomes n / m times by the frequency divider 681 and the frequency divider 682 in synchronization with the output of the reference oscillator. By using the PLL 680 in this manner, a signal whose frequency is n / m times can be obtained in synchronization with the reference signal source. However, in the method using the PLL, the VCO
(Voltage Controlled Variable Frequency Oscillator) The need for the 685 requires an oscillator as a separate component. In the above-mentioned conventional wireless communication system, control data and user data are transmitted at the same radio frequency. The data and the control data are transmitted and received by separate transmission means. Also, large-capacity data cannot be sent unless it is a thick transmission path, but sending small-capacity data over a thick transmission path is inefficient and uneconomical. A thick transmission line cannot be formed unless a high frequency is used, but it is difficult to form a thin transmission line at a high frequency due to the influence of jitter or the like caused by a high frequency.

[0010]

As described above, in order to cope with the transmission of wide-area and large-capacity information such as PHS and wireless LAN, the transmission speed of the uplink from the terminal to the base station and the transmission speed of the base station must be increased. If the transmission speed of the downlink to the terminal was equivalent, the wireless line could not be used effectively.

In a millimeter wave such as a 60 GHz band,
The radio wave propagation loss becomes very large from the height of the frequency.
Therefore, when communication is performed over a certain distance, the transmission power must be increased. Although the mobile terminal used in the SDL system is used near a 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 batteries, but transmitting at high power has the problem of shortening the time that the battery can be used continuously. There is also a problem that it is complicated.

Further, a device in the millimeter-wave band is very expensive, and the need for a transmission device in the millimeter-wave band in a terminal has made it difficult to meet the demand for lower prices. In terms of volume, the provision of a millimeter-wave band transmission device has made it difficult to reduce the size.

[0013] Modulation scheme of the signal for use in transmission, the bandwidth for transmitting (transmission rate), the frequency band, a scale of the transmitting and receiving circuit, selection of the device, depending on whether emphasis which matters spectral efficiency, throat of scheme The best one changes. For example, when importance is placed on the frequency use efficiency in narrowband communication such as a car phone, the π / 4DQPSK method and the QAM
A linear modulation such as a scheme is adopted. However, when performing wireless communication over a wide band, such linear modulation requires wireless components that operate linearly over a very wide band, making it difficult to reduce the size and power consumption.

In the SDL system in which the transmission rates are clearly different between the downlink and the uplink, if the same modulation scheme or a modulation scheme having similar properties is adopted as in the conventional case, a scheme matching either one is selected. Or, even with reduced performance, the only option was to choose a decent scheme for both downlink and uplink.

Further, in a conventional wireless communication system, information transmission of various qualities is realized by combining wireless communication systems which are different transmission systems. That is, diversification of transmission quality is realized by accommodating two transceivers of different transmission systems in one housing. For this reason, there was a disadvantage that the configuration of the transceiver was increased.

According to the present invention, information transmitted via the downlink can be transmitted to the terminal at a high speed by making the transmission speed of the downlink relatively higher than that of the uplink, and the frequency An object is to provide a highly efficient wireless communication system.

It is another object of the present invention to provide a wireless communication system capable of broadening the frequency band of a transmission wave used in a wireless communication system to the same range as a wired communication system.

Furthermore, to simplify the structure of a reference oscillator of the signal transmission speed required, is also an object to provide a wireless communication system capable of simplifying the configuration of a portable electronic device in a multi-media service.

[0019]

A radio communication system according to a first basic configuration of the present invention comprises at least one radio base station for performing radio communication between radio terminals using radio waves. A radio station, wherein the radio terminal uses one or more of the base stations and a first radio transmission band using a first radio transmission band using radio waves in a first frequency band.
A first transmitting means for performing wireless communication of the first and second radio transmission bands using a radio wave of a second frequency band higher than the first frequency band and a higher speed than the first radio transmission band. Using, any one or more of the radio base stations,
First receiving means for performing a second wireless communication,
Any one of the wireless base stations includes second receiving means for performing the first wireless communication with the wireless terminal using the first wireless transmission band, and the wireless base station Includes a second transmitting unit that performs the second wireless communication with the wireless terminal using the second wireless transmission band, wherein the wireless terminal includes the first wireless communication band. Further comprising third receiving means for performing the first wireless communication with any one or more of the wireless base stations using the wireless transmission band of A third wireless communication unit that performs the first wireless communication with the wireless terminal using a first wireless transmission band, and further includes a third transmission unit that uses the first wireless transmission band; 3 and the second and third receiving means are located within a wide communication area. The first wireless communication is performed, and the second transmitting means and the first receiving means using the second wireless transmission band perform the second wireless communication within a narrow communication area. I have.

In the wireless communication system according to the first basic configuration, the wireless base station including the second transmitting means transmits user information addressed to the wireless terminal using the second transmitting means. The wireless terminal may transmit the control information to the wireless base station including the second transmitting unit by using the first transmitting unit.

Further, in the wireless communication system according to the above configuration, the wireless base station including the third transmitting means transmits at least one of control information and audio information addressed to the wireless terminal to the third wireless terminal. The transmission may be performed using a transmission unit.

A wireless communication system according to a second basic configuration of the present invention comprises a wireless terminal and at least one or more wireless base stations for performing wireless communication using radio waves between the wireless terminal. , The wireless terminal uses a first wireless transmission band using radio waves in a first frequency band,
A first transmitting unit for performing a first wireless communication with any one or more of the base stations, and a radio wave of a second frequency band higher than the first frequency band; Using a second wireless transmission band faster than the transmission band,
And a first receiving means for performing a second wireless communication, wherein any one of the wireless base stations uses the first wireless transmission band. And a second receiving unit for performing the first wireless communication with the wireless terminal, wherein one of the wireless base stations uses the second wireless transmission band to perform the wireless communication. A second transmitting unit that performs the second wireless communication with a terminal, wherein the wireless terminal uses the first wireless transmission band, and at least one of the wireless base stations; The wireless base station further includes third receiving means for performing the first wireless communication, wherein one of the wireless base stations communicates with the wireless terminal using the first wireless transmission band. And further comprising a third transmitting means for performing wireless communication of The wireless base station transmits a wireless base station identification signal for identifying its own wireless base station to the wireless terminal using the second transmitting means, and the wireless terminal transmits the first receiving means A radio base station selecting means for receiving the radio base station identification signal and determining a radio base station suitable for connection based on the radio base station identification signal, The information on the radio base station selected by the means is transmitted to the radio base station.

A wireless communication system according to a third basic configuration of the present invention includes a wireless terminal, and at least one or more wireless base stations for performing wireless communication using radio waves between the wireless terminal. Wherein the wireless terminal comprises a first
A first transmission unit that performs first wireless communication with any one or more of the base stations using a first wireless transmission band that uses radio waves in a frequency band of And using one or more of the wireless base stations and a second wireless base station using a second wireless transmission band higher in speed than the first wireless transmission band. And first receiving means for performing communication, wherein one of the wireless base stations communicates with the wireless terminal using the first wireless transmission band. A second receiving unit for performing the second wireless communication with the wireless terminal using the second wireless transmission band. A transmitting unit, wherein the radio terminal uses the first radio transmission band to transmit the radio base station. And a third receiving unit for performing the first wireless communication with any one or more of the wireless terminals, wherein any one of the wireless base stations uses the first wireless transmission band to communicate with the wireless terminal. And a third transmitting means for performing the first wireless communication between the wireless base station and the wireless base station having the second transmitting means. A wireless base station identification signal for identifying a station is transmitted to the wireless terminal, and the wireless terminal receives the wireless base station identification signal using the first receiving means, and receives the wireless base station identification signal. A radio base station selecting unit that determines the radio base station suitable for connection based on the signal, wherein the radio base station selecting unit selects another radio base station other than the currently connected radio base station. If you decide that is the better connection, It is characterized by transmitting information about the selected radio base station to the radio base station by the radio base station selecting means.

A radio communication base station according to a fourth basic configuration of the present invention comprises at least one or more base stations used in a radio communication system for performing radio communication with radio terminals using radio waves. A second wireless communication that performs a first wireless communication with a first transmitting unit provided in the wireless terminal using a first wireless transmission band using a radio wave of a first frequency band. Between the receiving means and the first receiving means provided in the wireless terminal, using a radio wave of a second frequency band higher than the first frequency band,
Using a second wireless transmission band faster than the wireless transmission band of the second, between the second transmitting means for performing the second wireless communication and the third receiving means provided in the wireless terminal, First
And third transmitting means for performing the first wireless communication by using the wireless transmission band, and the first and third transmitting means, and the second and third transmission means using the first wireless transmission band. The third receiving means performs the first wireless communication in a wide communication area, and the second transmitting means and the first receiving means using the second wireless transmission band are arranged in a narrow communication area. Wherein the second wireless communication is performed.

[0025]

[0026]

[0027]

The radio communication system according to the present invention configured as described above is based on the aforementioned problem that it is more reasonable that the uplink transmission capacity of the terminal is smaller than the downlink transmission capacity of the base station. It has been proposed. That is, since the transmission rate of information transmitted from the terminal to the user is much higher than the transmission rate of information transmitted from the terminal to the base station side, the uplink and the downlink are considered in view of this remarkable difference in transmission capacity. The respective transmission / reception means are configured so that the transmission capacity of each can be matched with the transmission capacity required of each. It is reasonable that the transmission capacity of the personal portable electronic device is lower than the reception transmission capacity. Further, the user of the personal portable electronic device receives the output and sends a response thereto to the personal portable electronic device. Therefore, the personal portable electronic device only needs to be able to transmit information to the base station at a transmission speed lower than the information transmission speed when transmitting information to the user who has the personal portable electronic device.

That is, the personal portable electronic device receives information from the base station device at a speed higher than the information transmission speed at the time of transmitting information to the user having the personal portable electronic device. It is reasonable for the electronic device to transmit information at a speed lower than the reception speed.

This is strongly required because the battery capacity of the personal portable electronic device is limited. That is, the transmission power of the personal portable electronic device is controlled by the storage battery capacity, and the upper limit of the transmission band is strictly controlled by the transmission power. Therefore, personal portable electronic devices are required not to perform broadband transmission due to their limited storage battery capacity.

[0030]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Some preferred embodiments of the wireless communication system according to the present invention will be described in detail with reference to the accompanying drawings.

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

A radio 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, individual terminals 1
And each base station 5 is set between the terminal 1 and the base station 5.
, An uplink line 4 for wirelessly transmitting predetermined information to each terminal 1 and each base station 5, and predetermined information is wirelessly transmitted from the base station 5 to the terminal 1. And a downlink line 8.

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

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

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

In FIG. 2, a personal portable electronic device (terminal) 1 transmits and receives data to and from a base station 5 via lines 4 and 8. A signal processing unit 10 for processing data received between the transmitting / receiving unit 9 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 transmitted data And The signal processing unit 10 performs A / D conversion and encoding on data to be transmitted and performs DA conversion and decoding on received data, and temporarily stores 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 sound. The output unit 16 includes a speaker 17 for outputting sound related to transmitted data and a character And a display 18 for displaying information such as the like.

As shown in FIG. 3, the wireless communication system according to the second embodiment is applied to, for example, the field of broadcast communication where broadcasting and communication are integrated. In that case, the broadcast signal will be able to be received even by an electronic device owned by an individual. In such a case, the relay base station 5 responds to the request of the user of the electronic device,
One of the plurality of broadcast signals is selected and transmitted to the electronic device 1. By the way, the future electronic device 1 processes and uses the information received by broadcasting as desired. At this time, the information is stored in the relay base station in response to a request from the electronic device,
It may be processed as described below. FIG. 3 shows an example of the second embodiment.

As shown in FIG. 3, the relay base station 5 in the above-described wireless communication system includes a transmission / reception unit 20 for transmitting / receiving data to / from the electronic device 1 via the lines 4 and 8, And a signal processing unit 25 for processing the received data by a signal processing unit for processing and use, and a wired network terminating device 28 for receiving an information signal transmitted through a wired network such as a CATV or a subscriber optical cable or an ATM network.
And The transmission / reception unit 20 receives a control signal transmitted from the electronic device 1 via the uplink 4 and outputs data to be transmitted to the electronic device 1 via the antenna. Receiving unit (Rx) 22 for converting an (RF) signal into a predetermined frequency signal
And a transmission unit (T for converting data to be transmitted into an RF signal)
x) 23. The signal processing unit 25 selects a channel in response to various user requests of the electronic device 1 input from the channel data through the wired network terminating device 28 and transmits desired data to the electronic device 1. And a memory 27 for storing desired data according to the user's request.
And

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

The third embodiment is applied to a case where the amount of information generated by a person is apparently large and the received information is processed and retransmitted. FIG. 5 shows one of the third embodiments. 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, a MAN, or an ATM network. The information source database 32 transmits the information A to the electronic device 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 device 1 transmits the processing operator α (x) and the additional information β to the information amount increasing server 30 via the relay base station 5 via the uplink 4. The information amount of the operator and the additional information is information generated by a person who is a user of the electronic device 1 and has a small capacity. 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 the information α (A) + β obtained by processing to the electronic device 1A via the relay base station 5A, and display the information on the display 18 (see FIG. 2) of the electronic device 1A. In the electronic device 1, α
(A) + β may be created and displayed on the display 18.

As described in the third embodiment, the amount of information generated by humans may appear to be large. This is the case where the received information is processed and retransmitted. That is, the portable electronic device receives the original information of A, processes it, or adds it, converts it into α (A) + (B), and retransmits it. In this case, α (A) + β may look like a large amount of information at first glance. In many cases, the original information A has a very large capacity. However, the amount of information generated by humans is α
A conversion operation (X) and additional information β.
The amount of information necessary to represent the conversion operation (X) and the additional information β are information generated by humans,
Since the generation speed does not exceed the amount of information that can be generated by the human brain or body, it does not reach a certain speed, and is lower than the amount of information that can be received by humans. In such a case, instead of transmitting α (A) + β, only the conversion operation of α (X) and information of β are transmitted, and using this to generate α (A) + β on the receiving side, the result is that Is similar.

As described above, the relay base station 5 sends the information A to the electronic device 1, and the relay base station 5 stores the information A at the same time. Then, the electronic device 1 transmits only the conversion operation α (X) and the information β to the relay base station while the user views the information A. At the same time, in the electronic device 1, α (A) +
β is created and displayed, 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 excessive frequency resources and using a small-sized and small-capacity storage battery.

Therefore, when the file A is received,
After processing it or adding it, α (A) +
This is a case where the data is converted to the form β and retransmitted. In this case, α (A) + β may look like a large amount of information at first glance.
However, the amount of information generated by a human is a conversion operation α (X) and additional information β. The amount of information necessary to represent the conversion 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 or body. And also
As described above, since the speed is not constant, it is lower than the amount of information that can be received by humans. In such a case, α (A) +
Instead of transmitting β, only the conversion operation α (X) and the information β are transmitted, and the base station uses it to transmit α (A) +
Create β and transmit it to the other party.

Operations such as file editing can all be realized by such operations. That is, the original file is transmitted to the portable terminal through a broadband downlink, and the user edits the file while viewing the original file. The screen viewed by the user is updated according to the editing content while editing by each terminal. At the same time, the edited content is transmitted to the base station, where the original file is updated in accordance with the edited content. In this way, editing can be performed from the portable terminal to the base station with a very small amount of transmission.

With the above operation, the wireless transmission band is reduced, the wireless transmission power is reduced, and the information can be efficiently transmitted by the storage battery.

Such processing can be applied to examples other than the file operation described above. That is, A is the data of the face and voice of the user of the personal portable electronic device, and these information are stored in the base station or the relay station. Then, the personal portable electronic device transmits only the content of the spoken content and the parameters of the difference in intonation from the usual to the base station. Alternatively, only the point of the user's facial expression that is significantly different from the usual expression and only the expression parameters of emotion, emotion, and so on are wirelessly transmitted. The base station synthesizes the original sound and resynthesizes the original voice and the original screen transmission and transmits them. Thereby, the wireless transmission band is reduced, the wireless transmission power is reduced, and efficient information transmission with the storage battery is enabled.

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

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

In the fourth and fifth embodiments, in communication with an electronic device possessed by an individual, a broadband signal is transmitted on the downlink 8 from the relay base station to the electronic device, and the uplink from the electronic device to the relay base station is transmitted. No. 4 is applied to two modes, a communication mode for transmitting a narrowband signal and a communication mode for transmitting a narrowband signal. Downlink 8
Broadband is used for communication including images, file editing, information distribution / publicity, broadcasting, etc. In this case, the uplink 4 uses control signals and the above-mentioned conversion operators. In a communication mode in which both of them transmit a narrowband signal, both directions are used for voice or low-speed data transmission. For example, in FIG. 7, it is highly desirable that the uplink 4 be provided with one link having a narrow band and the downlink being provided with two links 8 and 34 having a narrow band and a wide band. This fifth embodiment is shown in FIG. In FIG. 7, reference numeral 34 denotes a narrowband downlink line using a low frequency. Further, it is desired that which one of the two links should be used is determined according to the request of the electronic device. That is, when making a call from the 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 the basic configuration of the radio communication system according to the fifth embodiment. The configuration shown in FIG. 8 is different from the configuration shown in FIG. And the downlink line 34.

When communication is started from the terminal 1 (electronic device), first, what kind of communication is to be performed using the narrow band uplink 4 is transmitted to the base station 5 or the relay base station.
It is reasonable to select or set one of the two as the downlink based on the transmission signal and open the bidirectional link. Also, when communication addressed to the electronic device 1 reaches the relay base station 5, if two downlinks of a narrow band and a wide band are provided, first, a call to the electronic device 1 is received using the narrow band link. Is transmitted to the electronic device 1 and the electronic device 1 receives or transmits the base station using the link to the call in response thereto, and receives a corresponding link assignment.

In this case, the narrowband links 4 and 34 may be narrowband bidirectional transmission means operating independently. For example, TDMA / TDD (Time Division Mult
A transmission system using an ipleAccess / Time Division Duplex) system may be used.

The sixth embodiment is applied to a case where a problem in frequency arrangement arises when the uplink and downlink bands are significantly different. That is, this is called FDMA / FDD.
(Frequency Division Multiple Access / Frequency Di
In the case of realizing a vision duplex, it is desirable to make the frequency interval between the uplink frequency and the downlink frequency the same if the specifications of the duplexer of the terminal are the same for all the terminals. At that time, in a narrowband uplink, a frequency difference from an adjacent channel becomes much wider than an uplink bandwidth, and many frequency bands remain unused, which is extremely inconvenient. Accordingly, the uplink is spread with a pseudo-random signal sequence, and transmitted with the same bandwidth as the downlink. If the spreading ratio is large, the frequency for this uplink can be shared with other systems.

The seventh and eighth embodiments are applied when a long-distance transmission cannot be performed because a high-speed downlink is easily affected by multipath. Here, there is a case where there is a demand for transmitting data to a distant place even if the band is narrow. In such a case, spread the signal with a long-period pseudo-random sequence for the signal that you want to reach far and then transmit it.For short-range large-capacity signals, spread the signal with a short-period pseudo-random sequence and transmit it By doing so, both requirements can be satisfied. Furthermore, since the transmission rate can be freely selected by selecting the sequence according to the location of the electronic device,
Communication can be performed with high flexibility when signals of various bands are mixed. Alternatively, when wireless circuits having different data rates coexist originally, each line is spread by a pseudo-random sequence having a sequence length such that the band after spreading is substantially the same, so that it is flexible and effective use of the frequency band can be achieved. It is possible to provide a wireless communication system capable of performing the above.

Further, when such a spread spectrum system is used, the same frequency band can be used for a plurality of links. Can be easily reduced in size.

In the ninth embodiment, the transmission and reception timings are changed between transmission and reception, and if a communication system is used in which both are not performed simultaneously, it is possible to freely select the uplink and downlink frequencies. This is applied when more effective use of frequency can be achieved.

In the tenth embodiment, if the uplink is random-accessed so as to support a wireless LAN, access to a server or a database connected to a network can be easily performed, and there are many advantages. Applies when producing

FIGS. 9 and 10 show the eleventh and twelfth embodiments.
It will be described based on.

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, a memory 42 is provided between the information providing station 41 and the base station 5,
Information obtained through the communication line 43 is stored in this memory. The portable electronic device 1 accesses the base station by wireless communication, but information desired by many portable electronic devices is almost stored in a memory, and most of the information exchange is executed only through the connection line 44. It 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 are 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 a low access frequency, and the new information 46 is written into the memory space 45.

As another embodiment, if the memory space is sufficiently large with respect to the amount of information, it is possible to write all the information in the memory in advance.

As still another embodiment, if the information has an expiration date, such as a newspaper or a weekly magazine, it is possible to erase the information in the memory or overwrite new information at the time when the expiration date has come. It is possible.

FIG. 11 is a diagram showing a state of an 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 provider has a communication line 49.
Is connected to the base station 5. The base station 5 is installed in a station, a building, a road, or the like, and transmits information according 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 relate to the SDL system shown in the conceptual diagram of FIG. The wireless line is composed of a broadband downlink from the base station to the personal digital assistant device and a narrowband uplink from the terminal to the base station. In these embodiments, only the asymmetry of the transmission rate of the uplink and the downlink is proposed, but no mention is made of the frequency allocation or the modulation scheme.

FIG. 67 shows a conventional frequency arrangement example. Japanese digital car telephone system RCR
Take STD-27B as an example. In this system, the downlink and uplink have the same transmission speed, and there are 800 MHz band and 1.5 GHz band radio frequency bands. In both frequency bands, the uplink and the downlink are configured with the same frequency band. 8
In the 00 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, the transmission and reception are performed in the same frequency band because the downlink and the uplink having the same transmission speed are assumed. However, a problem occurs when the application to the SDL system is considered.

Since a wideband downlink is assumed in the SDL system, it is difficult to realize a low frequency band such as the 800 MHz band from the viewpoint of securing a wide bandwidth and effectively using the frequency. For example, when trying to transmit about 100 MHz, one
It may be said that it is impossible to secure a band of 00 MHz. For this reason, from a quasi-millimeter wave band of about several GHz to several tens of GH
Transmission in a millimeter wave band of about z is required.

The wireless communication system according to the present invention
FIG. 12 shows an example of a frequency arrangement in the case of being configured by a z-band SDL system.

On the other hand, there is an upper limit to the capacity of information that can be generated by a human due to the ability of the human. On the other hand, the amount of information that can be sensed by humans is much larger than the amount of information that can be generated by humans. There is a limit to the information that can be generated by humans, even if voice, gestures, keyboard and mouse inputs, facial expressions, and all other information are added. The information volume of human voice is far less than 64 kbps. Even when using information transmission means between various human machines such as keyboards and mice, they do not exceed the information generated by all individual human brains and body organs, and the information generated by humans It is considered that the total does not exceed 100 kbps on average.

On the other hand, the amount of information that can be received by humans is extremely large. Humans receive various kinds of information from a plurality of media such as voices, images, atmospheres, touch senses, and senses of smell through individually movable perceptual organs. In addition, the human brain and various organs of the human body, based on information obtained from various sensory organs, only information on the capacity that can be processed by the brain and various organs of the body according to the history of each individual and the priority of processing , Extract from the information obtained,
To process. In addition, they receive much larger information than the information generated by individual people in their daily lives. Then, feedback is applied to information receiving means such as which information is to be received according to the received information. The method of applying this return differs for each individual, and therefore, even when many people receive the same information, the processing method differs greatly. That is, humans can receive much more information than the amount of information that can be processed by individual human brains and various organs of the body.

This can also be understood from the difference in size between the part responsible for information reception and the part responsible for information transmission in the human brain.
The audio-visual area of the brain is extremely large. On the other hand, the part related to language generation is not so large. Nerves are spread all over the body, and various information is collected in the brain and spinal cord. While the amount of information is extremely large, the information generated by the brain is limited to voice and slight gestures.
Regarding the thickness of the nerve, which is an information transmission path in the body, the thickest is the optic nerve that controls the reception of visual information.

This can be understood from engineering applications. That is, when producing image information to be received by a human, generally, information of several megabits or more per second is required in order to produce image information that a human feels natural. Moving images made with less information than that can be easily detected by humans as unnatural movements and shapes. Then, a human cannot generate a corresponding amount of image information. Information of human facial expressions is much smaller than image information generally sensed by human eyes. This is inferred from the fact that when the band compression of the image is performed in consideration of the human expression, the compression ratio is extremely high. The band compression of images taking human expressions into account 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 of human facial expressions has a very small volume, and the same applies to voice. With the current band compression technology, audio information can be compressed to about 4 kilobits per second, so the amount of information is small.

When information is generated not by voice but by performance of a musical instrument, the amount of information is also limited. Considering the amount of information generated by playing the piano, the piano is provided with 88 keys, and when one of the keys is played, information of less than 7 bits is generated. A person can press 10 keys per second, 10 fingers, and the sound level is 1000
7 * 10 * assuming that it changes to the stage (10 bits)
10 * 10 = 7000, which is at most 7 kilobits per second, which does not change depending on the type and tone of the piano. The information speed generally required when recording a piano performance is about 100 kilobits per second, but among them, the amount of information generated by the player is only 1000 bits per second described above. At first glance, it seems that a large amount of information is generated during the performance of the musical instrument, but the information generated from the musical instrument is modulated by information generated by humans, which is information about the tone and personality of the musical instrument. It just looks like a big piece of information.

On the other hand, when receiving information, a human can receive and process a very large amount of information.
An orchestra in which 150 players generate information, and if only one person makes a mistake, it can be easily recognized. Also, the information unique to the musical instrument generated from each musical instrument is distinguished from the extremely large amount of information that is modulated by the information generated by the player, and humans always recognize and extract those features. That is.

Consider a situation where five people are seriously meeting with each other. Each person receives information from four other people who are making every effort to transmit their assertions to the other. All of the information from the other four has not been processed by the receiving human brain, but at least has been received through that human sensory organ. Even after the meeting, participants have a rough idea of who went and what they did. This is possible because information is received from four others and the necessary part of the information is processed by the brain. On the other hand, with regard to information transmission, it is generally impossible for one person to generate information exceeding the sum of information generated by the other four people on average. Therefore, there is a large difference between the information generated by humans and the amount of information that can be received, and the amount of information generated by humans is extremely smaller than 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 is limited to transmission of voice at most. Therefore, the transmission capacity was clearly lower than the amount of information that humans could originally generate. 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 will be possible. Come. At this time, if the transmission and reception speeds are made the same as in the conventional case, the frequency cannot be effectively used.

Conventionally, the same modulation scheme is generally used for both downlink and uplink. For example, in a narrow-band digital car telephone system using TDMA in Japan and the United States, π / 4D is used for both downlink and uplink.
The QPSK method is adopted. The proposal to adopt a different modulation scheme for downlink and uplink is C
US Digital Car Telephone Standard using DMA (IS-
95). Uplink is OQPSK (Offset Qua
It is drature phase shift keying (offset 4 phase shift keying) and the downstream is QPSK (Quadvature Phase Shi
ft Keying-4 Phase shift keying-). However,
The information transmission rate is the same, and the configuration is clearly different from the SDL system. In addition, since the same PSK is adopted, the properties are very similar. There is no example in which modulation schemes having completely different characteristics are used in downlink / uplink systems having completely different transmission rates.

FIG. 13 shows a thirteenth embodiment of the present invention.
Communication is performed between the wireless communication terminal 101 and the portable wireless terminal 102 connected to the wired network. FIG. 14 shows the relationship between the radio frequency band and the transmission speed in this communication.

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, BSPK, which is a binary modulation, is used as the modulation method, so that the transmission speed and the used bandwidth are described as the same. R1 is a transmission rate of 100 Mbps and is 60 GH
By performing in the z band, a band of 100 MHz can be secured, and broadband transmission is realized.

A wireless line (uplink) from the portable 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. The information generated by the mobile terminal 102 is considered to be mainly input by keys or input signals by voice.
If the transmission speed is about 0 kbps, information transmission can be sufficiently performed. In this embodiment, it is 30 kbps. 30kbps
In this case, a sufficient bandwidth can be ensured even in the 800 MHz band, so that transmission in this band is possible.

Also, since the radio frequency band at the terminal is low,
The radio wave propagation loss in space is small, and it is not necessary to transmit with a very strong power. Also, because the transmission bandwidth is small,
The total power is small. Therefore, power consumption can be reduced, and the time during which a continuous call can be made without recharging or replacing the battery can be extended.

Further, devices in the 800 MHz band are widely used in automobile telephones and the like, inexpensive devices have become widespread, and miniaturization of devices has been progressing. By setting the uplink to the 800 MHz band, it is possible to reduce the cost and size of the terminal.

FIG. 15 shows a fourteenth embodiment of the present invention.

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 speed 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 wireless frequency f1 in a 60 GHz band. R1 is a high-speed line of, for example, 100 Mbps. With it 80
At f2 'in the 0 MHz band, another downlink is established at a transmission rate of R2 (for example, 30 kbps). 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 wireless frequency f2 in the 800 MHz band.

The difference from the thirteenth embodiment is that another downlink is established at f2 · R2. 60 GHz
Band downlinks are susceptible to shielding due to the characteristics of the frequency band. Disconnection of the communication line occurs due to shadowing by the shield. In this embodiment, by installing another link at f2 'in the downlink, it is possible to prevent the downlink from being completely cut. 80
The radio frequency f2 'in the 0 MHz band has less propagation loss and is less susceptible to shadowing as compared to the radio frequency f1 in the 60 GHz band, and therefore the possibility of line disconnection is reduced. For example, by allocating 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 above protocol / interruption protocol through the control channel. In this case, the portable wireless terminal 302 newly has a receiving device of f2 ′ · R2.
Compared to the 0 GHz band receiver, the additional portion is so small and low in current consumption, volume and price that it can be ignored. By adopting the radio frequency band / transmission speed system configuration of the present embodiment, a high-performance portable terminal can be realized with small size, low power consumption, and low cost.

FIG. 17 shows a fifteenth embodiment of the present invention. 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. The radio base station 501 transmits to each mobile terminal 502 at a frequency of f1, f1 ′, f1 ″ in the (downlink) 60 GHz band at a transmission rate of R1. From each mobile terminal 502, the radio base station 50 is transmitted.
1 to (uplink) 2.4 GHz band f2, f
It is transmitted at a transmission rate of R2 at frequencies 2 ', f2 ". R1 is 100 MHz and R2 is 2 MHz. Here, wideband transmission of millimeter waves in a downlink between one base station and a plurality of terminals is performed. And 2.4G for uplink
A relatively narrow band transmission in the Hz band is performed. As shown in FIG. 18, the frequency allocation at each terminal is f1 with f2, f2
It is configured that f2 'corresponds to 1' in order.

In the present embodiment, both the uplink and the downlink are multiplexed by using the frequency multiplexing method. However, the multiplexing can be performed by an access method such as a time division multiplexing method, a code division multiplexing method, an Aloha method. . Book 15
In the embodiment, the 2.4 GHz band is used in order to make the transmission speed of the uplink relatively high at 2 MHz. 2.4GH
Although the propagation loss in the z band is larger than that in the 800 MHz band, the propagation loss is much smaller than in the 60 GHz band, and the transmission power of the terminal is suppressed to be smaller than when the uplink and downlink are configured in the same 60 GHz band. It becomes possible. The effect of the terminal on the human body is small,
A low current consumption, compact, and inexpensive terminal can be configured.

FIG. 19 shows a sixteenth embodiment of the present invention. 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 speed in the seventeenth embodiment. The downlink has a frequency f1 in the 19 GHz band and a broadband transmission rate R
1 is performed. Here, R1 is 50 Mbps. Another downlink is configured with a 400 MHz band frequency f3 and a narrow band transmission rate R2 (eg, 2 kbps). The uplink is configured with 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 frequencies used by the terminal 2 are f1 ', f2', and f3 '. With this arrangement, 400MHz
The interval between the uplink and downlink radio frequencies in the narrow band of the band can be made constant, and it becomes easy to synchronize the frequencies in the terminal. By allocating the downlink in the 19 GHz band, the bandwidth of the downlink can be increased, and
By arranging narrow-band uplinks and downlinks in the 0 MHz band, the probability of complete disconnection is kept low, and stable control becomes possible. Since the 400 MHz band downlink receiver can be configured very simply, it can be realized without significantly affecting the total terminal scale. By configuring the uplink at a low transmission rate at a frequency as low as the 400 MHz band, a simple portable wireless terminal can be provided.

FIG. 21 shows a seventeenth embodiment of the present invention. 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 wireless device of the seventeenth embodiment has f1, R
Antenna 901 for receiving the wireless signal of No. 1 and a receiving device, antenna 9 for transmitting the wireless signal of f2 and R2
03, an interface 906 between the transmitting device and other parts of the portable terminal and a control device 905. Here, f1 is a high frequency band (eg, 60 GHz band),
1 is a wide band (for example, 100 Mbps), f2 is a low frequency band (for example, 800 MHz band), and R2 is a narrow band (for example, 30 kbps). Reception and transmission are frequency bands
Since it has a different bandwidth, it has an independent antenna,
Perform reception. The receiving device includes a frequency conversion device and a demodulation device for demodulating a signal in a frequency of a wireless RF band into a digital signal. The transmitting device includes a digital modulator and a frequency converter for converting a digital signal into a radio frequency RF (Radio Frequency) signal. The control device has a function of setting the timing of transmission and reception in synchronization with the frequency and transmission speed of transmission and reception. By providing the wireless device having such a configuration in the portable terminal, the thirteenth and the first
A mobile terminal applicable to the wireless communication system of the fifth embodiment can be configured.

FIG. 22 shows an eighteenth embodiment of the present invention. 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. The difference from the embodiment of FIG. 15 is that the receiving apparatus 1004 receives a narrow band (eg, 30 kbps) signal at a low frequency band frequency f2 (eg, 800 MHz band).
And a duplexer 1006 that accommodates the transmission signal and the reception signal of f2 in one antenna. The transmission 1005 and the receiving device 1004 in the 800 MHz band are less expensive than the receiving device in the 60 GHz band, and can be easily reduced in size. In addition, since transmission can be performed at a low frequency and in a narrow band, transmission power can be reduced. It is possible to configure a portable wireless terminal that has little effect on the human body. By providing a wireless terminal having such a configuration in a mobile terminal, it is possible to configure a mobile terminal applicable to the wireless communication systems of the twelfth and fourteenth embodiments.

FIG. 23 shows a nineteenth embodiment of the present invention. 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 the present embodiment, a radio base station will be described as an example.
The base station is a millimeter wave band (eg, 60 GHz) which is a first frequency band.
transmission rate R1 (example: 100M) at radio frequency f1
(bps) transmission device 1101 and a radio frequency f2 in a frequency band lower than f1 (eg, 800 MHz band).
And a receiving apparatus 1102 for receiving at a transmission rate R2 (eg, 30 kbps) lower than R1. In addition, a control unit and a signal processing unit and an interface unit for connecting to a wired system are provided.

By providing a transmitting device and a receiving device having different frequency bands and transmission speeds, it is possible to configure a radio device and a radio base station applicable to the radio communication systems of the first and third embodiments.

FIG. 24 shows a twentieth embodiment of the present invention. This embodiment relates to a radio apparatus and a radio base station applied to the radio communication systems of the fourteenth and sixteenth embodiments. The wireless device of this embodiment has a frequency f1 of the first millimeter wave band.
And a transmitting device 1202 for transmitting 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 and R2.

By providing the transmission device and the reception device having different frequency bands and transmission rates, it is possible to configure a radio device and a radio base station applicable to the radio communication systems according to the fourteenth and sixteenth embodiments. is there.

FIG. 25 shows a twenty-first embodiment of the present invention. The twenty-first embodiment is a wireless communication system including a base station 1301 and a terminal 1302. The base station communicates with the transmitter 1303 that transmits the transmission rate R1 by infrared rays and the radio frequency f.
2 includes a receiver 1304 for receiving the transmission rate R2 and a signal processing unit for performing other control by interfacing with a wired system. The terminal includes an infrared receiver 1305, a wireless transmitter 1306, and a signal processing unit that controls and interfaces with 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 down link is a radio link using radio waves, it is necessary to secure a band corresponding to the transmission speed. When high-speed transmission is performed, a wide band must be secured, and it is necessary to develop an unused high frequency band such as a millimeter wave band. However, in the present embodiment, by setting the downlink that requires a wide band to infrared light, it is possible to configure the system without the restriction of securing the radio frequency bandwidth. Devices using the millimeter wave band or the like are expensive and have a large volume, but infrared devices are inexpensive and have a small volume, so that both terminals and base stations can be small and inexpensive.

FIG. 26 shows a twenty-second embodiment of the present invention. The wireless device 1401 of the base station is in a first radio frequency band (for example, 6
0 GHz) and a high transmission rate R1 (100
Mbps) and R1 at a frequency f2 in a radio frequency band (eg, 800 MHz) lower than f1.
It comprises a receiving device that receives a signal having a lower transmission rate R2 (eg, 30 kbps). The wireless device section of the terminal includes a receiving device for receiving the signals f1 and R1, and a transmitting device for transmitting the signals f2 and R2.

Here, transmission of f1 and R1 and transmission of f2 and R2 are performed by different modulation methods. 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 nonlinear modulation scheme is desired in the downlink. In the millimeter wave band, the propagation loss is large due to its radio wave propagation characteristics, and the range of radio waves is short. Therefore, it is effective to improve the frequency use efficiency by zone design. Also, since the millimeter wave band has a relatively wide band,
The utilization efficiency on the frequency axis is not as strict as conventional microwaves. For this reason, a modulation scheme that is large enough to have a bandwidth compared to the transmission rate is allowed. For these two reasons, the modulation scheme is nonlinear modulation, and FSK with a modulation index of 0.5 or more, which 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. Is gone. But,
In this frequency band, since the bandwidth of the allocated frequency is small, the frequency must be effectively used on the frequency axis. Therefore, a modulation method having excellent frequency utilization efficiency is desired. Although it is a linear modulation, π / 4DQPSK and offset QPSK which are excellent in frequency use efficiency are suitable for implementation, and GMSK and the like, which is somewhat inefficient, are suitable for implementation.

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

As described above, in the SDL system, since the transmission speed and transmission frequency band of the uplink and downlink are different, it is possible to obtain high-quality lines by using different modulation schemes. Become.

FIG. 27 shows a twenty-third embodiment of the present invention. The base station and the terminal shown in the present embodiment are each as shown in FIG. The downlink from the base station 1501 to each terminal 1502 has a transmission rate R1 at a frequency f1 in a 60 GHz band.
(100 Mbps), modulation method 1 (code multiplex modulation: CD
M), and the uplink from each terminal to the base station is transmitted at a transmission rate R2 (8 kbp) at a frequency f2 in the 800 MHz band.
s), and transmitted by the modulation scheme 2 (GMSK). Changing the transmission speed, frequency band, and modulation method for the uplink and downlink can provide a high-quality line and reduce the size and power consumption of the terminal.

FIG. 28 shows a twenty-fourth embodiment of the present invention. The base station 1601 performs transmission at a radio frequency f1 in a quasi-millimeter wave band (19 GHz) using a transmission device 1603 having a transmission rate R1. The transmission rate R1 is not fixed but is 1 Mbps to 1
It is a variable transmission rate of 5 Mbps. Modulation method 1 is 4-level F
SK. In the terminal, the same frequency f1 and transmission rate R
1. A receiving device 1606 of the modulation system 1 performs reception.
The broadband downlink mainly performs data transmission that requires a wideband such as an image. In addition to the downlink, the base station and the terminal include a transceiver having a frequency f2 (1.9 GHz), a transmission rate R2 (384 kbps), and π / 4DQPSK. In the transmission at the frequency f2, the same frequency is used because the time division multiple access / time division multiplexing (TDMA / TDD) system is used. FIG. 29 is a conceptual diagram showing a system configuration using the base station and the terminal of FIG.
The base station 1701 has a modulation scheme 1, f1 and R1 downlink on the downlink to each terminal 1702, and also has a modulation scheme 1, f2 and R2 uplink and downlink. By adopting such a configuration, it is possible to obtain a high-quality line for each, and to configure a system in which instantaneous interruption due to shadowing is small.

In the twenty-fourth embodiment, the same transmission rate R2 is used for both the uplink and the downlink at f2. Here, it is conceivable that the transmission rate is R2 for the uplink and the transmission rate is R2 'for the downlink. f2
In the uplink and downlink, control information is mainly transmitted, but in the uplink, in addition to mere control information, retransmission control when downlink data in f1 is incorrect and data in the uplink are used. Transmission takes place. Since downlink data transmission is performed by the high-speed downlink of f1, only the control data is transmitted in the downlink of f2. Therefore, asymmetry of the information amount occurs in the uplink and the downlink at f2. Conventional wireless communication systems do not consider the asymmetry of information, and allocate the same band for uplink and downlink. By giving different transmission speeds for the uplink and the downlink on the f2 line mainly transmitting control information, it is possible to achieve more efficient frequency utilization.

Hereinafter, a twenty-fifth embodiment of the present invention will be described with reference to the drawings. First, a digital wireless communication system according to a 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. As the downlink line and the uplink line, for example, first to first
SDL-Net shown in the second embodiment is given. SDL-N
In et, 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 lower than the signal transmission speed of the downlink line. Thus, miniaturization of the portable electronic device is considered.

FIG. 31 shows a configuration example of a portable electronic device used in the 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 section, and is converted into an analog signal by a DA converter (DAC) and an interpolation filter (LPF). Is 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 a band-pass filter (BP).
The image after the multiplication is suppressed by F), amplified by the RF amplifier, and output from the 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 signal generator (oscillation frequency f2),
Frequency conversion is performed. The image of the mixer output after the multiplication is suppressed by the LPF, and then converted to a digital signal by an A / D converter (ADC). ADC
The output (digital signal) is demodulated in the digital section.

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

The frequency dividing device (1 / n) shown in FIG.
2 and an n-ary counter and a phase shifter. As a result, the signal transmission speed differs between the uplink and the downlink, and the signal transmission speed of the uplink is higher than the signal transmission speed of the downlink, so that the system clock generator can be shared and the circuit configuration can be simplified. Can be realized. Further, by adopting the circuit configuration of FIG. 32, it is possible to generate an uplink line clock at an arbitrary phase timing. This operation will be described with reference to FIG. 33. The clock of the downlink line is frequency-divided by an n-ary counter, and phase-shifted to an arbitrary phase timing by a phase shifter. With the above configuration, it is possible to synchronize uplink and downlink transmission signals.

Next, a digital radio communication system according to a twenty-sixth embodiment of the present invention will be described with reference to FIG. 26th
The wireless communication system according to the embodiment includes a PHS line and a high-speed downlink line, and includes 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 line base. It consists of 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. The signal transmitted from the portable electronic device to the information service base station is transmitted through the PHS line.

FIG. 35 shows the configuration of the radio section and the modem section 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 transmission unit and reception unit 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. The digital signal output from the control unit and the memory is transferred to the radio unit and the modem unit, and transmitted as a radio signal.

When demodulating a radio signal, a carrier (carrier) and a timing clock must be reproduced from the received signal. FIG. 36 shows the configuration of a receiver when performing carrier reproduction and timing reproduction.
The radio signal received by the antenna is amplified by an RF amplifier (hereinafter, the output of the RF amplifier is referred to as an RF signal). The carrier reproduction circuit reproduces a 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 an LPF to remove an image signal due to frequency conversion (hereinafter, the LPF output is referred to as a baseband signal). The timing reproduction circuit reproduces a 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 to receive two types of wireless signals having different signal transmission rates (FIG. 37). ). That is, as shown in FIG. 37, a timing reproduction circuit 1 for reproducing a timing clock from the baseband signal 1 and a baseband signal 2
A timing recovery circuit 2 for recovering a timing clock from the clock is required.

According to the present invention, the lower one of the two timing recovery circuits can be replaced with the frequency divider and the phase shifter shown in FIG. 32, and the circuit configuration can be simplified. In addition, high-speed downlink lines and PH
The transmission timing of the S line can be synchronized.

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

Next, a digital radio communication system according to a twenty-seventh embodiment of the present invention will be described. The configuration of the portable electronic device shown in FIG. 37 requires two types of carrier recovery circuits and clock recovery circuits. If this is simply expressed, FIG.
It looks like 8. Carrier reproduction and timing reproduction are performed using the RF signal 1 and the RF signal 2 and the baseband signal 1 and the baseband signal 2, respectively. According to the present invention as shown in FIG. 31, the circuit configuration can be simplified by replacing the other clock generation source with a frequency divider and a phase shifter. Further, the present invention is applicable not only to a clock recovery circuit but also to a carrier recovery circuit. FIG. 39 shows an example in which the present invention is applied to a carrier reproducing circuit.

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

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

Next, a digital radio communication system according to a twenty-eighth embodiment of the present invention will be described. In the wireless communication system shown in FIG. 30 or FIG. 34, when transmitting information 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, Perform transmission. By treating the transmission signal on a frame basis, error correction and ARQ can be easily applied. FIG. 40 shows a block of a frame timing detection circuit for recovering a frame timing clock from a demodulated bit data sequence. Here, the configuration of the receiver shown in FIG. 2 is assumed. The bit data sequence demodulated in the digital section is input to a correlator together with a bit timing clock. The correlator comprises a cascade-connected D-type flip-flop (shift register) and a comparator. The output of the shift register delayed by the bit timing clock and the known signal previously inserted in the transmission signal for frame detection are input to the comparator, and the result of comparison between the two is output.
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 by one type of PLL, and the circuit configuration can be simplified. It is possible to configure a frame timing detection circuit by the collector and the phase shifter. FIG. 41 shows an example in which a frame timing detection circuit is constituted by a frequency divider and a phase shifter.

In FIG. 41, a demodulated bit sequence 1 and a bit timing clock 1 are input to a correlator 1, and a trigger signal for frame timing is detected. Correlator 1
Is input to a PLL comprising 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 transmitter is
It 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.

Further, since the frame timing can be generated by dividing the bit timing clock, the bat timing clock reproducing circuit and the frame timing reproducing circuit can be shared. FIG.
2 shows a clock signal generation circuit. An error signal is detected from a plurality of inputs (the number of input signals i) such as an RF signal and a baseband signal to control the voltage-controlled variable frequency oscillator, and the desired clock (the number of output signals k Get) With the above configuration, the circuit configuration can be simplified.

Next, a radio communication system according to a twenty-ninth embodiment of the present invention will be described with reference to FIG. FIG.
It comprises an S base station, a wired network, and an SDL-Net base station. SDL-Net mainly performs data transmission using a downlink line that is faster than PHS,
The location is registered using the HS line.

As described above, in a system in which two or more different transmission systems coexist, the circuit configuration can be simplified by replacing one clock recovery circuit with a frequency divider and a phase shifter. However, for that purpose, clocks of different transmission systems need to be synchronized. FIG. 43 shows, as an example, via a network,
2 shows a method of synchronizing a PHS line and an SDL-Net line. A reference signal transmitter is provided on the network side. In the PHS base station, a signal synchronized with the 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 the synchronization signal. Similarly, the SDL-Net base station also generates a signal synchronized with the reference signal on the network side by a synchronization circuit,
The 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 may be configured by a frequency divider and a phase shifter as described above.

Next, a radio communication system according to a thirtieth embodiment of the present invention will be described. As shown in FIG.
In a wireless communication system including a base station, a wired network, and an SDL-Net base station, it is assumed that the PHS service area does not match the SDL-Net service area. That is, as shown in FIG. 44, the PDL service area includes the SDL-Net service area. It is conceivable that there are a plurality of SDL-Net service areas.

The SDL system described above includes a system having a narrow band uplink radio channel (uplink) and a wide band downlink radio channel (downlink), and a narrow band upper and lower radio channel (uplink, downlink).
And a system having a broadband downlink radio channel (downlink). However, 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, a broadband wireless base station uses a high frequency in order to realize high-speed transmission in a downlink wireless channel. However, it is difficult to widen a service area of the high frequency because radio waves are attenuated at a high frequency. Also, the wider the bandwidth, the greater the transmission distortion due to intersymbol interference and the greater the effect of thermal noise.Therefore, the service area of a broadband wireless base station is larger than that of a narrowband wireless base station. It becomes narrow. Therefore, the service area of the narrowband wireless base station and the service area of the wideband wireless base station have different area configurations.

Therefore, in the SDL system, the connectable narrowband radio base station may remain the same and the connectable broadband radio base station may change with the movement of the radio mobile station. As a base station, both a narrowband wireless base station and a wideband wireless base station must be recognized. Regarding the method of recognizing which narrowband wireless base station is located in the service area of the wireless mobile station, the upper and lower wireless channels are provided between the narrowband wireless base station and the wireless mobile station. A procedure similar to the method used in the mobile phone service can be used. The procedure used in the mobile phone service is that a radio base station broadcasts an identification signal indicating its own station on a downlink channel, and a radio mobile station that has received the signal transmits the identification signal to the radio base station via an uplink channel. To transmit an identification signal indicating its own station. This recognizes which wireless base station the wireless mobile station is located in the service area.

On the other hand, no specific method has been described in the above description regarding the method of recognizing which broadband wireless base station the wireless mobile station is located in the service area of. Therefore, in a system as the object of the present invention, regarding a method of recognizing which broadband radio base station is located in a service area of a radio mobile station,
It can be said that it did not exist. As described above, there is no method for recognizing which broadband wireless base station is in a service area of a wireless mobile station that is indispensable for starting provision of a communication service. However, in a system including a wireless mobile station having no broadband uplink wireless channel as its component, communication for providing a service could not be started. Further, in a situation where a service is being provided, a service cannot be maintained when a wireless mobile station moves to a service area of another wireless base station, that is, handover cannot be performed.

In the radio communication systems according to the thirty-first to thirty-ninth embodiments, as shown in the conceptual diagram of FIG. 45, the radio mobile station 51 is notified from the broadband radio base station 52 via a radio channel. A connection optimal station interpreting means 61 for receiving a signal for identifying the broadband wireless base station 52 and interpreting the broadband wireless base station 52 suitable for connection from the received signal; An optimal base station notifying means 62 for transmitting the specific specific broadband wireless base station 52 to the server 56 via the narrowband wireless base station 53, and the server 56 connecting to the wireless mobile station. Service start means 63 for starting the predetermined service via the specific broadband wireless base station 52 determined to be suitable.

When a handover needs to be performed, the radio communication system according to the thirty-first to thirty-ninth embodiments provides the radio communication system according to any one of the above-described means, When receiving the predetermined service via the broadband wireless base station, identifies the broadband wireless base station broadcast via a wireless line from the broadband wireless base station different from the specific broadband wireless base station. And a means for interpreting a broadband wireless base station suitable as a connection switching destination from the received signal, and the specific wideband wireless base suitable for the wireless mobile station as a connection switching destination. Means for transmitting a station to the server via the narrowband radio base station, and wherein the server has been determined to be suitable as a connection switching destination for the radio mobile station. And a means for providing switched connections such as via the constant wideband radio base station continuously the predetermined service.

According to the above configuration, a radio mobile station that has received a signal for identifying a broadband radio base station broadcast from the broadband radio base station is suitable for connection by interpreting the received signal. Determine the broadband wireless base station.
The wireless mobile station uses the uplink wireless channel from the wireless mobile station to the narrowband wireless base station to inform the narrowband wireless base station which broadband wireless base station it is connected to. Since the narrowband wireless base station and the server are connected via the network, the narrowband wireless base station informs the server via the network which wireless broadband base station the wireless mobile station is suitable for connection to. 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 radio mobile station can make the server recognize which broadband radio base station is suitable for connection, and the server The predetermined service can be started for the wireless mobile station via the broadband wireless base station determined to be suitable for the connection by the wireless mobile station.

[0132] Further, the maintenance of the service when the radio mobile station moves to the service area of another broadband radio base station under the condition that the predetermined service is provided through one of the broadband radio base stations is also described. According to the thirty-first to thirty-ninth embodiments of the present invention, a signal for identifying a broadband wireless base station broadcast from a broadband wireless base station via a wireless line is received, and the received signal is interpreted. Then, a broadband wireless base station suitable as a connection switching destination is determined. Then, the wireless mobile station informs the server via the narrowband wireless base station which broadband wireless base station is suitable as a connection switching destination. By doing so, 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 provide a predetermined service to the wireless mobile station by switching the connection through the broadband wireless base station determined to be suitable as the connection switching destination.

First, the configuration of a wireless communication system to which the 31st to 39th embodiments of the present invention are applied will be described. FIG. 46 is a conceptual diagram showing the configuration of the system according to the present invention. FIG.
, 51 is a wireless mobile station, 52 and 53 are wireless base stations, 56 is a data server, and 57 is a network. The wireless base station 52 has transmission means for performing broadband information transmission (hereinafter, referred to as a broadband wireless base station 52). On the other hand, the wireless base station 53 has transmission / reception means for performing narrowband information transmission (hereinafter, referred to as the narrowband wireless 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. Also, the broadband wireless base station 5
The wireless channel between the mobile station 2 and the wireless mobile station 51 is called a broadband wireless channel, and the wireless channel between the narrowband wireless base station 53 and the wireless mobile station 51 is called a narrowband wireless channel.

In FIG. 46, for convenience, the broadband wireless base station 52 and the narrowband wireless base station 53 are distinguished.
As shown in FIG. 47, one wireless base station 58 may include both transmitting / receiving means for transmitting information in a narrow band and transmitting means for transmitting information in a wide band. In this case, although the cost of the wireless base station 58 increases, the total number of wireless base stations in the entire system can be reduced. Further, when it is necessary to perform control between a transmitting / receiving means for transmitting information in a narrow band and a transmitting means for transmitting information in a wide band, the control is facilitated. Hereinafter, the 31st to 39th embodiments of the present invention will be described with reference to FIG. 46 in which the wideband 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 radio mobile station 51 is located in the area shown in FIG.
A description will be given of a procedure for starting wireless communication when connection is possible. FIG. 49 shows a most basic flowchart according to the thirty-first embodiment. In step ST1, the wireless mobile station 51
Is interpreted in which broadband wireless base station 52 is located in the service area. In step ST2, the information interpreted in step ST1 is transmitted to the server 56 via the narrowband wireless base station 53. Thus, the data server 56 can recognize which broadband wireless base station 52 the wireless mobile station 51 is located in the service area. In step ST3, the radio mobile station 51 is sent to step ST3.
The provision of the service via the broadband wireless base station 52 interpreted in 1 starts. Further, when actually starting the service, various procedures based on the above-described flowchart can be considered, and FIG. 50 shows an example thereof. Step ST11
Then, it is interpreted that the broadband wireless base station 52 is located in the service area of the wireless mobile station 51. In step ST12, it is determined whether there is a service request from the user. When there is a service request from the user, the process proceeds to step ST13, and when there is no request, the process proceeds to step ST13.
Repeat step 11. In step ST13, it is determined whether or not to receive a service using a broadband downlink radio channel. If the service is to be received using the broadband downlink radio channel, the process proceeds to step ST14, and if not, the process proceeds to step ST16. In step ST14, the information interpreted in step ST11 is transmitted to the narrowband radio base station 53.
To the server 56 via. 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, when selecting not to receive the service using the broadband downlink radio channel in step ST13, that is, when selecting to receive the service using the narrowband downlink radio channel, in step ST16, The station 51 informs the server 56 that a narrowband downstream radio channel will be used as the downstream channel. In step ST17, the radio mobile station 51
In response to this, provision of a service via the narrowband wireless base station 53 is started.

In the thirty-first embodiment, step S
An example in which step ST14 is performed when a service using a broadband downlink radio channel is received at T13 is shown. However, if step ST14 is performed after step ST11, the process may be performed regardless of the presence or absence of a service request. I do not care. In other words, 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 wireless base station 53. In this case, regardless of the presence or absence of a service request from a user, the server 56 determines which broadband wireless base station 5 the wireless mobile station 51 has.
2 can be recognized as being located in the service area. Step ST12 is replaced with step ST11.
, That is, only when there is a service request from the user, the steps after step ST11 are performed. In this case, when there is no request from the user, the radio mobile station 51 does not have to interpret which broadband radio base station 52 is located in the service area of the radio mobile station 51.
Power consumption is reduced. In order to further reduce power consumption, it is possible to turn off the power of the receiving means for transmitting information over a wide band.

Next, a sequence diagram of a communication start procedure of the wireless communication system according to the thirty-first embodiment will be described with reference to FIG. The wireless mobile station 51 receives a signal 511 for identifying a wireless base station broadcast from the broadband wireless base station 52, and determines from which received signal the broadband wireless base station 5
2 can be determined as being located in the service area. When a service request is issued in such a situation, the user dials up 510 the telephone number unique to the server and obtains a communication line from the wireless mobile station 51 to the server 56 via the narrowband wireless base station 53. I do. After the communication line from the wireless mobile station 51 to the server 56 is acquired, the wireless mobile station 51 transmits the data transmission request message 20.
A signal 513 for identifying the broadband wireless base station 52 to which the local station 2 can be connected is transmitted to the server 56. The server 56 stores the data request message 5 transmitted from the user.
12 and the signal 513, and the information 5 requested by the user via the broadband wireless base station 52 designated by the signal 513.
14 is transmitted.

Thirty-second embodiment: In the thirty-second embodiment, 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, wireless communication is performed. The starting procedure will be described. 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 in the service area of the broadband wireless base station 52, that is, that the wireless mobile station 51 cannot be connected to the broadband wireless base station 52. In step ST22, the wireless mobile station 51 informs the server 56 via the narrowband wireless base station 53 that the narrowband downlink wireless channel is to be used as the downlink channel.
In step ST23, the provision of the service to the wireless mobile station 51 via the narrowband wireless base station 53 is started. When starting the service, various procedures based on the above-described flowchart can be considered.

FIG. 53 shows an example. In step ST31, it is interpreted that the radio mobile station 51 is not located in the service area of the broadband radio base station 52, that is, that it cannot connect to the broadband radio base station 52. Step ST
At 32, it is determined whether or not there is a service request using a narrowband downlink radio channel. When there is a service request from the user, the process proceeds to step ST33, and when 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 the narrowband downlink radio channel will be used as the downlink channel. Step ST
At 34, the provision of the service to the wireless mobile station 51 via the narrowband wireless base station 53 is started. Further, in the above embodiment, after interpreting that the radio mobile station 51 cannot connect to the broadband radio base station 52 in step ST31, that is, after determining whether or not the radio mobile station 51 can connect to the broadband radio base station 52, in step ST32, The example in which the presence or absence of a service request from a user is determined has been described.
Step ST31 may be performed.

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 the signal can be received, the signal strength required and sufficient to provide the service cannot be obtained. Therefore, the wireless mobile station 51 interprets that it is located outside the service area of the broadband wireless base station. That is, the wireless mobile station 5
1 recognizes that only a service using a narrowband downlink radio channel can be received. In such a case, the user selects whether or not to receive the service using the narrowband downlink radio channel. When receiving a service using the narrowband down-link wireless channel, the user dials up 540 the telephone number unique to the server and obtains a communication line from the wireless mobile station 51 to the server 56 via the narrowband wireless 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 mobile station 51 can connect to the server. Transmit. Normally, the narrow-band wireless base station 53 used for the downlink wireless channel is the same as the narrow-band wireless base station 53 used for the uplink wireless channel, so that the signal 543 cannot use the broadband downlink wireless channel. The information may simply be transmitted to 56. The server 56 interprets the data request message 542 and the signal 543 transmitted from the user, and transmits the signal via the narrowband wireless base station 53 specified by the signal 543 or the narrowband wireless base station 53 used in the uplink wireless channel. Then, the 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 a handover that occurs when the radio mobile station 51 moves within the service area of the radio base station 53 of a specific narrow band. Because the narrowband wireless base station 5
3 has upper and lower radio channels, so that handover between the narrow band radio base stations 53 can be sufficiently dealt with by a conventional handover procedure. Since the procedure for starting communication has been described in the thirty-first and thirty-second embodiments, the thirty-third to thirty-sixth embodiments will describe the handover procedure after the service is provided.

Thirty-third Embodiment: In the thirty-third embodiment, when the radio mobile station 51 moves as shown in FIG. 48C, that is, when the radio mobile station 51
The procedure of handover when moving to the service area of another broadband wireless base station 52 while receiving service in the service area 2 will be described.

FIG. 55 shows the most basic flowchart according to this embodiment. In step ST41, it is determined whether or not the radio mobile station 51 can receive a signal broadcast from a broadband wireless base station 52 different from the broadband wireless base station 52 that is providing a service. If the signal can be received, the reception electric field strength of the signal is compared with the reception electric field strength of the signal transmitted from the broadband radio base station 52 currently providing the service. 51 interprets the handover destination broadband wireless base station 52. Therefore, the broadband wireless base station 5 currently providing the service
If the received electric field strength of the signal transmitted from 2 is sufficient,
The service is continued without switching the wireless base station. In addition, the scale of selection of whether or not to perform connection switching differs depending on the communication quality required by the provided service. For example, in the case of a voice communication service, the required communication quality is not so high, and therefore, even if the communication quality slightly deteriorates due to the movement of the wireless mobile station 51, 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, so that the wireless base station is switched so that the communication quality is improved even a little. In step ST42, the information interpreted in step ST41 is transmitted to the server 56 via the narrowband wireless base station 53. This allows the server 56
Can recognize the broadband wireless base station 52 at 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, a sequence diagram of 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 receiving the information data 565 transmitted from the broadband wireless base station 52 is deteriorated, so that the information cannot be correctly received. . 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. As a result, it is possible to determine from the received signal to which broadband wireless base station 52 the mobile station is moving. The radio mobile station 51 determines whether or not to perform handover based on the signal strength at the time of receiving the information signal 565 and the signal 566. If it is not necessary to perform the handover, the reception of the information data 565 is continued.

When it becomes necessary to perform handover, the radio mobile station 51 transmits to the server 56 a handover request message 567 and a signal 558 for identifying the handover destination broadband radio base station 52. The server 56 sends a handover request message 56
When the signal 568 is interpreted as “7”, a line disconnection request message 569 is sent to the broadband wireless base station 52 in communication. After the line is disconnected, the server transmits the information data 570 via the broadband wireless base station 52 specified by the signal 568.
As a result, the user can continue to receive the provided service even when the service area is changed due to the movement.

Thirty-Fourth Embodiment: In the thirty-fourth embodiment, the radio mobile station 51 moves as shown in FIG. 48D, that is, the radio mobile station 51
The procedure of handover when moving out of the service area of the broadband wireless base station 52 while receiving service in the service area 2 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 reception electric field strength of a signal transmitted from the broadband wireless base station 52 currently providing the service is deteriorated. Also, a signal broadcast from a broadband wireless base station 52 that is different from the broadband wireless base station 52 that provides the service cannot be received. Therefore, step ST
At 51, the wireless mobile station 51 includes a broadband wireless base station 52.
Interpret that you cannot connect with. In step ST52, the radio mobile station 51 determines that it cannot connect to the broadband radio base station 52, that is,
The transmission via the narrowband wireless base station 53 is transmitted to the server 56 via the narrowband wireless base station 53. In step ST53, the server 56 switches the connection through the narrowband wireless base station 53 and continuously provides the service.

Also, in the above embodiment, when receiving the predetermined service, the radio mobile station 51
In the case where the connection with the mobile station cannot be established, the example has been described on the assumption that the connection is switched to the connection via the narrowband wireless base station 53. However, as a step following the step ST51, the connection is provided using the narrowband downlink wireless channel. A step of selecting whether to continue the provided service or stop the provided service may be added. If the continuation of the service is selected, the process proceeds to step ST52. The case of selecting the stop of the service will be described in detail in a thirty-fifth embodiment.

Next, a sequence diagram of handover in the thirty-fourth embodiment will be described with reference to FIG. When the radio mobile station 51 moves as shown in FIG. 48 (d), the signal strength at the time of receiving the information data 585 transmitted from the broadband radio base station 52 is deteriorated, so that the information cannot be correctly received. . On the other hand, the wireless mobile station 51
Has moved out of the service area of the broadband wireless base station 52, and cannot receive the signal 586 for identifying the wireless base station broadcast from another broadband wireless base station 52. Even if the signal can be received, a sufficient signal strength necessary for providing the service cannot be obtained. Therefore, the wireless mobile station 51 interprets that it is located outside the service area of the broadband wireless base station 52. That is, the wireless mobile station 51 recognizes that only the service using the narrowband downlink wireless channel can be received. For this reason, the connection is switched to the narrowband downlink radio channel by the following procedure, and the provided service is continued.
The radio mobile station 51 sends a handover request message 587
And a signal 588 for identifying the handover destination narrowband wireless base station 53 to the server 56.

Normally, the narrow band radio base station 53 used in the downlink radio channel is the same as the narrow band radio base station 53 used in the uplink radio channel, so that the signal 588 cannot use the wide band downlink radio channel. To the server 56
It may be just information to tell. When interpreting 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 wireless base station 53 specified by the signal 588 or via the narrowband wireless base station 53 used for the uplink wireless channel.
Is transmitted. As a result, the user can continue to receive the provided service even when the service area is changed due to the movement.

Thirty-Fifth Embodiment In the thirty-fifth embodiment, the radio mobile station 51 moves as shown in FIG. 48D, that is, the radio mobile station 51
The procedure for stopping the service when moving out of the service area of the broadband wireless base station 52 while receiving the service in the service area 2, that is, the procedure for disconnecting the line will be described with reference to FIG. 59.

Since the radio mobile station 51 has moved out of the service area of the broadband radio base station 52, the reception electric field strength of the signal transmitted from the broadband radio base station 52 currently providing the service deteriorates. Also, a signal broadcast from a broadband wireless base station 52 that is different from the broadband wireless base station 52 that provides the service cannot be received. Therefore, in step ST61, the wireless mobile station 51 interprets that it cannot connect to the broadband wireless base station 52. Step ST62
In this case, the radio mobile station 51 indicates that it cannot connect to the broadband radio base station 52, that is, the radio mobile station 51 indicates that the service provided is to be stopped.
To the server 56 via. 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. In addition, as described in the thirty-fourth embodiment, a step of selecting whether to continue the service provided by using the narrowband downlink radio channel or to stop the provided service. Is added, the step follows step ST61. If it is determined in this step to stop the provided service, the process proceeds to step ST62.

Next, a sequence diagram of handover in the thirty-fifth embodiment will be described with reference to FIG. When the radio 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 radio base station 52 is deteriorated, so that the information cannot be correctly received. . On the other hand, the wireless mobile station 51
Has moved out of the service area of the broadband wireless base station 52, and cannot receive the signal 606 for identifying the wireless base station broadcast from another broadband wireless base station 52. Even if the signal can be received, a sufficient signal strength necessary for providing the service cannot be obtained. Therefore, the wireless mobile station 51 interprets that it 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 the service using the broadband downlink wireless channel. for that reason,
Perform procedures to stop the services provided. The wireless mobile station 51 transmits a communication disconnection request message 607 to the server 56. When interpreting the communication disconnection request message 607, the server 56 sends a line disconnection message 608 to the wireless mobile station 51 via the communicating broadband wireless base station 52. Thus, when the wireless mobile station 51 leaves the service area due to the movement, the provided service can be promptly stopped by the user's will.

Thirty-Sixth Embodiment: In this embodiment, when the mobile station 51 moves as shown in FIG.
That is, when the radio mobile station 51 moves into the service area of the broadband radio base station 52 while receiving service using the narrowband downlink radio channel outside the service area of the broadband radio base station 52, The over procedure will be described with reference to FIG.

As the radio mobile station 51 moves, it becomes possible to receive a signal for identifying the radio base station broadcast from the radio base station 52 over a wide band. Therefore, step S
At T71, the wireless mobile station 51 interprets which broadband wireless base station 52 the mobile station 51 has moved into the service area of. In step ST72, the information interpreted in step ST71 is transmitted to the server 5 via the narrowband wireless base station 53.
Tell 6 As a result, the server 56 communicates with the wireless mobile station 5
1 can be recognized as to which broadband wireless base station 52 is in the service area. 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 a hand-over, the radio mobile station 51 always waits for reception of a signal broadcast by the wideband radio base station 52 even when using a narrowband radio channel. There must be. This is because handover may be performed when the mobile terminal enters the service area of the broadband wireless base station 52, even if the signal reception state via the narrowband wireless base station 53 is good.

In the above-described embodiment, the example has been described in which the handover is immediately performed when it can be interpreted in step ST71 that the mobile radio station 51 has moved into the service area of the broadband radio base station 52. Before performing, a step of selecting whether or not to perform a handover by the user may be added. Because, as described above, the reception state of the signal via the narrowband wireless base station 53 is:
This is because handover is not necessarily required for a service that does not require high-speed transmission, such as a voice communication service, which is not necessarily in a bad state. There are three places to add this step, each having the following features.
First, when this step is added after step ST72, regardless of whether or not to perform handover, the server 56 recognizes which broadband wireless base station 52 the wireless mobile station 51 is located in the service area. it can. Next, when this step is added after step ST71,
When the handover is not performed, since the wireless mobile station 51 is not notified to the server which broadband wireless base station 52 is located in the service area, the traffic volume between the wireless mobile station 51 and the server 56 is reduced. . Finally,
If this step is added before step ST71, the radio mobile station 51 does not need to interpret which broadband radio base station 52 is located in the service area of the radio mobile station 51.
Power consumption is reduced. In this case, the power consumption of the receiving means for transmitting information over a wide band is turned off, thereby further reducing power consumption.

Next, a sequence diagram of handover in the system of the sixth embodiment will be described with reference to FIG.
When the radio mobile station 51 moves as shown in FIG. 48 (e), the radio mobile station 51 can receive the signal 625 for identifying the radio base station broadcast from the broadband radio base station 52. It can be determined from the received signal to which broadband wireless base station 52 the mobile 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 of whether or not to perform handover is made according to the user's will. Alternatively, whether or not to perform handover when entering the service area of the broadband wireless base station 52 is set in advance. When the setting is made not to perform the handover, the radio mobile station 51 may turn off the power of the receiver for the wideband information transmission. If the handover is not performed when the radio mobile station 51 enters the service area of the broadband radio base station 52, the information data 62 is passed through the narrowband radio base station 53 as it is.
4 is continued to be received.

When performing a handover, the radio mobile station 51 sends a handover request message 626 and a handover destination broadband radio base station 5 to the server 56.
2 is transmitted. Server 5
6 is a handover request message 626 and a signal 627
Is interpreted, a line disconnection message 628 for the downlink wireless channel is sent to the narrowband wireless base station 53 in communication. After the line is disconnected, the server 56 transmits the information data 629 via the broadband wireless base station 52 specified by the signal 627. As a result, the user can continue to receive the provided service even when the service area is changed due to the movement.

37th embodiment: A unique logical number is assigned to the server 56. When a plurality of servers exist on the network, one logical number is common to all servers. When the user wants to receive the service, he calls the server 56. As a method of calling, there are a method in which the user directly dials up a logical number (FIG. 63 (a)) and a method in which the user selects an SDL service item displayed on the radio mobile station 51 (FIG. 63 ( b)). Where SD
The L service refers to a service provided using the SDL system. In this method, the items of the SDL service are associated with the logical numbers, and when the user selects the item of the SDL service, dial-up is automatically performed. In either case, the server 56
First, a communication line from the wireless mobile station 51 to the narrowband wireless base station 53 is acquired.

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

First, there is a method in which each narrowband wireless base station 53 has previously recognized the server 56 to which the local station is to connect, and always selects that server 56. Usually, the connected server 56 is adjacent to the narrowband wireless base station 53. Second, the server 5 with a light load on the server 56
6 is available. In this method, the narrow band wireless base station 53 observes the load on the server 56 and selects a server 56 with a small load. Third, there is a method of selecting a server 56 with a light load on the network 57. This method uses the narrowband wireless base station 53 and the server 56.
This is a method in which a communication path with little traffic is used as a communication path between them. In addition, as a fourth method, the above 3)
Among the methods, a method in which at least two or more methods are combined is exemplified. As this method, for example, the narrowband wireless base station 53 observes the load of the server 56 and selects the server 56 closest to the narrowband wireless base station 53 from the servers 56 whose load is smaller than a certain value. There are methods. After the selection of the server 56 is performed using the above selection method, a communication line from the narrowband wireless base station 53 to the server 56 is obtained.
A communication line from the wireless mobile station 51 to the server 56 is obtained.

Thirty-eighth embodiment: As shown in FIG. 63 (c), a specific logical number is assigned to each service.
The user makes a call using the logical number corresponding to the service to be received. There are two types of calling methods: a method in which the user dials up a logical number directly, 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 a thirty-eighth embodiment. In this method, when a user selects a service, the user is automatically dialed up to a corresponding logical number.
In either case, when a call is made to the server 56, first, the wireless mobile station 51 sends the call to the narrowband wireless base station 53.
A communication line to is obtained.

Next, the narrow band wireless base station 53
6 is connected. If there is only one server 56 on the network 57 that provides the desired service, a communication line from the narrowband wireless base station 53 to the server 56 is obtained. When there are a plurality of servers 56 that provide a desired service on the network 57, the server 56 to which the narrowband wireless base station 53 connects is provided.
Make a selection. Since the selection method is the same as that of the following thirty-ninth 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 obtained, and thereby a communication line from the wireless mobile station 51 to the server 56 is obtained.

Thirty-ninth embodiment: The radio mobile station 51 indicates whether communication with the radio base station is possible. More specifically, both whether the own station can communicate with the narrowband wireless base station 53 and whether the own station can communicate with the broadband wireless base station 52 are displayed. As a display method, a method of displaying the signal strength of the radio wave from each base station in a stepwise manner (FIG. 64)
(A)) and a method of binaryly indicating whether communication is possible or not (FIG. 64 (b)). Further, in order to perform the above-described display, the radio mobile station 51 measures a reception electric field strength when a signal transmitted from the broadband radio base station 52 is received,
Means for displaying the measurement result in a human-recognizable expression method, and measuring the received electric field strength when a signal transmitted from the narrowband wireless base station 53 is received, and using the human-recognizable expression method for the measurement result. Display means.

According to the thirty-ninth embodiment, the user can recognize what service he or she can receive. In other words, the user can receive the service using the narrowband downlink radio channel, but can recognize that the user cannot receive the service using the broadband 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 user moves to the service area of the broadband wireless base station 52 without receiving any service at the local point and then uses the broadband downlink wireless channel. It is possible to select a user's will to receive a service of high-speed wireless transmission or a service of low-speed wireless transmission using a narrowband downlink wireless channel at the present time. Also,
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 line,
Measuring a received electric field strength of the first signal;
(A step of displaying the received electric field strength of the first signal in a representation method that can be recognized by a human) and the following two steps (the radio mobile station 51 is connected to the narrow band radio base station) with respect to the signal transmitted from the narrow band radio base station 53. Measuring a received electric field strength of the second signal when receiving a second signal transmitted via a wireless line from the apparatus, and a method of expressing the received electric field strength of the second signal so that a human can recognize the received electric field strength. Steps to be displayed) are independent steps. Therefore, when the user issues a message to the radio mobile station 51, the broadband radio base station 52
If it is set in advance not to receive the high-speed transmission service via the base station, a method of not performing the two steps related to the signal transmitted from the broadband wireless base station 52 may be considered. In this case, the power consumption of the wireless mobile station 51 can be reduced. As described above, the thirty-first aspect of the present invention
According to the thirty-ninth embodiment, even in a system such as an SDL system including a wireless mobile station having no broadband uplink wireless channel as a component, the server can connect to any broadband wireless base station to which the wireless mobile station is connected. It is possible to recognize whether or not there is, and the service can be provided. Further, even when the handover needs to be performed due to the movement of the wireless mobile station, the server can recognize the handover destination broadband wireless base station, and the service can be provided continuously. It becomes possible.

FIG. 65 shows a wireless communication system according to a fortieth embodiment comprising a PHS base station, a wired network, and an SDL-Net base station, similarly to FIG.
43 is different from FIG. 43 in that a PHS receiver is provided in the SDL-Net base station and that there is no reference transmitter on the network side. As shown in FIG. 44, the SDL-Net base station
It exists inside the service area of the PHS. for that reason,
By inputting the signal received by the PHS receiver to the synchronization circuit, it is possible to synchronize the clocks of the PHS and the SDL-Net.

FIG. 66 shows a forty-first embodiment as an entire configuration to which the radio 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.

[0168]

As described above in detail, the radio communication system according to the present invention has a relatively low transmission rate for radio signals on the uplink line and a relatively low transmission rate for radio signals on the downlink line. As a result, the large-capacity user information can be transmitted from the base station to the terminal at a high speed, so that it is possible to sufficiently respond to the user's request and to use the frequency effectively.

[Brief description of the drawings]

FIG. 1 is a block diagram showing a basic concept of the present invention.

FIG. 2 is a block diagram showing a wireless communication system according to the first embodiment of the present invention.

FIG. 3 is a block diagram showing a wireless communication system according to a second embodiment of the present invention.

FIG. 4 is an explanatory diagram showing a wireless communication system according to a third embodiment of the present invention.

FIG. 5 is a block diagram showing a wireless communication system according to a fourth embodiment of the present invention.

FIG. 6 is an explanatory diagram showing an example of a communication mode.

FIG. 7 is an explanatory diagram showing another example of a communication mode.

FIG. 8 is a block diagram showing another configuration example of the basic concept of the present invention.

FIG. 9 is a block diagram showing a configuration of a fifth embodiment of the present invention.

FIG. 10 is a view showing an embodiment showing a use state of a memory space in the embodiment of FIG. 7;

FIG. 11 is a block diagram showing an example of an SDL system to which the present invention is not applied.

FIG. 12 is a diagram illustrating a frequency allocation of a wireless communication system.

FIG. 13 is a conceptual diagram showing a wireless communication system according to a thirteenth embodiment of the present invention.

FIG. 14 is a diagram showing a frequency allocation in a thirteenth embodiment of the present invention.

FIG. 15 is a conceptual diagram showing a wireless communication system according to a fourteenth embodiment of the present invention.

FIG. 16 is a diagram showing a frequency allocation in a fourteenth embodiment of the present invention.

FIG. 17 is a conceptual diagram showing a wireless communication system according to a fifteenth embodiment of the present invention.

FIG. 18 is a diagram showing a frequency allocation in a fifteenth embodiment of the present invention.

FIG. 19 is a conceptual diagram showing a wireless communication system according to a sixteenth embodiment of the present invention.

FIG. 20 is a diagram showing a frequency allocation in a sixteenth embodiment of the present invention.

FIG. 21 is a block diagram showing a wireless communication system according to a seventeenth embodiment of the present invention.

FIG. 22 is a block diagram showing a wireless communication system according to an eighteenth embodiment of the present invention.

FIG. 23 is a block diagram showing a wireless communication system according to a nineteenth embodiment of the present invention.

FIG. 24 is a block diagram showing a wireless communication system according to a twentieth embodiment of the present invention.

FIG. 25 is a block diagram showing a wireless communication system according to a twenty-first embodiment of the present invention.

FIG. 26 is a block diagram showing a wireless communication system according to a twenty-second embodiment of the present invention.

FIG. 27 is a block diagram showing a wireless communication system according to a twenty-third embodiment of the present invention.

FIG. 28 is a block diagram showing a wireless communication system according to a twenty-fourth embodiment of the present invention.

FIG. 29 is a block diagram showing a wireless communication system according to a twenty-fourth embodiment of the present invention.

FIG. 30 is a diagram showing a service area of a wireless communication system according to a twenty-fifth embodiment of the present invention.

FIG. 31 is a diagram illustrating an operation of a portable electronic device used in a wireless communication system according to a twenty-fifth embodiment of the present invention.

FIG. 32 is a diagram showing a configuration of a frequency divider according to a twenty-fifth embodiment of the present invention.

FIG. 33 is a diagram showing a configuration of a portable electronic device used in a wireless communication system according to a twenty-sixth embodiment of the present invention.

FIG. 34 is a diagram showing a service area of a wireless communication system according to a twenty-sixth embodiment of the present invention.

FIG. 35 is a diagram showing a configuration of a receiver included in the timing clock recovery circuit.

FIG. 36 is a diagram showing a configuration of a receiver for configuring a timing clock recovery circuit according to a twenty-sixth embodiment of the present invention.

FIG. 37 is a diagram showing input / output signals of a carrier recovery and timing recovery circuit according to a twenty-seventh embodiment of the present invention.

FIG. 38 is a diagram showing input / output signals of a reference signal generation circuit according to a twenty-seventh embodiment of the present invention.

FIG. 39 is a diagram showing a configuration of a frame timing clock recovery circuit.

FIG. 40 is a diagram showing a configuration of a frame timing clock recovery circuit according to a twenty-eighth embodiment of the present invention.

FIG. 41 illustrates a structure of a clock recovery circuit.

FIG. 42 is a diagram showing a configuration of a clock synchronization circuit according to a twenty-ninth embodiment of the present invention.

FIG. 43 is a diagram showing a configuration of a wireless communication system according to a thirtieth embodiment.

FIG. 44 is a diagram showing a configuration of a clock synchronization circuit according to a thirtieth embodiment of the present invention.

FIG. 45 is a block diagram showing an overall concept of a wireless communication system according to Examples 31-39 of the present invention.

FIG. 46 is a diagram showing an overall configuration of a wireless communication system according to Examples 31-39 of the present invention.

FIG. 47 is a diagram showing another overall configuration of the wireless communication system according to the 31st to 39th embodiments of the present invention.

FIG. 48 is a diagram showing a state of movement of a wireless mobile station in a wireless communication system according to Examples 31-36 of the present invention.

FIG. 49 is a flowchart showing processing steps of a wireless communication system according to a thirty-first embodiment of the present invention.

FIG. 50 is a flowchart showing service start processing steps in a wireless communication system according to a thirty-first embodiment of the present invention.

FIG. 51 is a sequence diagram showing a communication start procedure of the wireless communication system according to the thirty-first embodiment of the present invention.

FIG. 52 is a flowchart showing processing steps in a wireless communication system according to a thirty-second embodiment of the present invention.

FIG. 53 is a flowchart showing service start processing steps in the wireless communication system according to the thirty-second embodiment of the present invention.

FIG. 54 is a sequence diagram showing a communication start procedure of the wireless communication system according to the thirty-second embodiment of the present invention.

FIG. 55 is a flowchart showing processing steps in a wireless communication system according to a thirty-third embodiment of the present invention.

FIG. 56 is a sequence diagram showing a communication start procedure of the wireless communication system according to the thirty-third embodiment of the present invention.

FIG. 57 is a flowchart showing processing steps of a wireless communication system according to a thirty-fourth embodiment of the present invention.

FIG. 58 is a sequence diagram showing a communication start procedure of the wireless communication system according to the thirty-fourth embodiment of the present invention.

FIG. 59 is a flowchart showing processing steps in a wireless communication system according to a thirty-fifth embodiment of the present invention.

FIG. 60 is a sequence diagram showing a communication start procedure of the wireless communication system according to the thirty-fifth embodiment of the present invention.

FIG. 61 is a flowchart showing processing steps of a wireless communication system according to a thirty-sixth embodiment of the present invention.

FIG. 62 is a sequence diagram showing a communication start procedure of the wireless communication system according to the thirty-sixth embodiment of the present invention.

FIGS. 63 (a) and (b) are plan views each showing a radio mobile station used in a radio communication system according to a 37th embodiment of the present invention, and (c) is used in a system according to the 38th embodiment. FIG. 2 is a plan view showing a wireless mobile station.

FIGS. 64 (a) and (b) are plan views respectively showing a wireless mobile station used in a wireless communication system according to a thirty-ninth embodiment of the present invention.

FIG. 65 is a diagram illustrating a configuration of a wireless communication system according to a fortieth embodiment of the present invention.

FIG. 66 is a diagram showing a configuration of a wireless communication system according to a forty-first embodiment of the present invention.

FIG. 67 is a diagram showing a configuration of a conventional PLL.

FIG. 68 is a diagram showing a frequency arrangement of a conventional radio frequency counting system.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 Terminal 2 Low-speed transmitting means 3 High-speed receiving means 4 Uplink line 5 Base station 6 Low-speed receiving means 7 High-speed transmitting means 101, 103 ... Wireless devices 501, 701, 1301, 1401, 1501, 16
01, 1701 ... wireless base station 102, 302, 502, 702, 1302, 140
2,1502,1602,1702 ... Wireless terminal 901,903 ... Antenna 902,1002,1004,1102,1203,1
304, 1605, 1606, 1608 ... Receiving device 904, 1005, 1101, 1201, 1306, 1
603, 1604, 1607 ... Transmitting device 1303 ... Infrared transmitting device 1305 ... Infrared receiving device

──────────────────────────────────────────────────続 き Continued on the front page (72) Inventor Takashi Wakutsu 1 Komukai Toshiba-cho, Saiwai-ku, Kawasaki-shi, Kanagawa Prefecture Toshiba R & D Center Co., Ltd. (72) Inventor Minoru Minoru Komukai, Sai-ku, Kawasaki-shi, Kanagawa Toshiba Town 1 Toshiba R & D Center (72) Inventor Nobuyasu Nakajima Nobuyasu Kojima Toshiba Town 1 Kawasaki-shi, Kanagawa Prefecture Toshiba R & D Center (72) Inventor Eiji Kamagata Kawasaki-shi, Kanagawa Toshiba-cho, Komukai-ku 1 Toshiba R & D Center Co., Ltd. (72) Inventor Katsuya Farmer 1 Toshiba-cho, Komukai Toshiba-cho, Kawasaki-shi, Kanagawa Prefecture Toshiba R & D Center Co., Ltd. (72) Kiyoshi Toshimitsu Kanagawa (1) Inside R & D Center, Toshiba Corporation, Komukai Toshiba-cho, Kawasaki-shi, Kawasaki, Japan (56) References JP-A-3-178244 (JP, A) 167565 (JP, A) JP-A-3-62630 (JP, A) JP-A-1-293020 (JP, A) JP-A-4-20044 (JP, A) JP-A-3-195234 (JP, A) JP-A-6-252896 (JP, A) JP-A-7-46248 (JP, A) JP-A-3-191622 (JP, A) JP-A-1-253326 (JP, A) JP-A-7-75154 (JP, A) JP-A-62-82732 (JP, A) JP-A-7-283780 (JP, A) JP-A-7-284156 (JP, A) JP-A-6-13950 (JP, A) JP-A-7-67165 (JP, A) JP-B-46-18442 (JP, B1) JP-A-9-505186 (JP, A) JP-A-9-510596 (JP, A) Mutsumu Serizawa et al. , SDL-Net: A Wireless Access Link to Broadband Multi-media Networks, 1996 IEEE 46th Vehicular Technology, United States, Surveyed on April 1, 1997, April 1, 1997, April 97, IEEE, 1997 .Cl. ⁷ , DB name) H04L 12/56 H04L 12/28 H04Q 7/36

Claims (6)

(57) [Claims] 1. A wireless communication system comprising a wireless terminal and at least one or more wireless base stations performing wireless communication using radio waves between the wireless terminal and the wireless terminal, wherein the wireless terminal has a first frequency band. A first transmission unit that performs a first wireless communication with any one or more of the base stations using a first wireless transmission band that uses radio waves of a first frequency band higher than the first frequency band; The second radio communication is performed with any one or more of the radio base stations using radio waves in the second frequency band and using a second radio transmission band faster than the first radio transmission band. A first receiving unit, wherein one of the wireless base stations performs the first wireless communication with the wireless terminal using the first wireless transmission band. Wherein any one of the radio base stations is Using a second wireless transmission band, comprising a second transmission means for performing the second wireless communication with the wireless terminal, the wireless terminal, using the first wireless transmission band, The radio base station further includes third receiving means for performing the first radio communication with any one or more of the radio base stations, and any one of the radio base stations uses the first radio transmission band. And further comprising third transmitting means for performing the first wireless communication with the wireless terminal, wherein the first and third transmitting means using the first wireless transmission band and the second transmitting means And the third receiving means perform the first wireless communication in a wide communication area, and the second transmitting means and the first receiving means using the second wireless transmission band communicate in a narrow communication The second within the area
A wireless communication system characterized by performing wireless communication of: 2. The wireless base station having the second transmitting means transmits user information addressed to the wireless terminal using the second transmitting means, and the wireless terminal transmits the second transmission information. The wireless communication terminal according to claim 1, wherein control information is transmitted to the wireless base station having the means using the first transmitting means. 3. The wireless base station comprising the third transmitting means transmits at least one of control information and voice information addressed to the wireless terminal using the third transmitting means. The wireless communication system according to claim 2, wherein 4. A wireless communication system comprising a wireless terminal and at least one wireless base station performing wireless communication between the wireless terminal and the wireless terminal using radio waves, wherein the wireless terminal has a first frequency band. A first transmission unit that performs a first wireless communication with any one or more of the base stations using a first wireless transmission band that uses radio waves of a first frequency band higher than the first frequency band; The second radio communication is performed with any one or more of the radio base stations using radio waves in the second frequency band and using a second radio transmission band faster than the first radio transmission band. A first receiving unit, wherein one of the wireless base stations performs the first wireless communication with the wireless terminal using the first wireless transmission band. Wherein any one of the radio base stations is Using a second wireless transmission band, comprising a second transmission means for performing the second wireless communication with the wireless terminal, the wireless terminal, using the first wireless transmission band, The radio base station further includes third receiving means for performing the first radio communication with any one or more of the radio base stations, and any one of the radio base stations uses the first radio transmission band. The wireless base station further comprising a third transmitting unit that performs the first wireless communication with the wireless terminal, and the wireless base station including the second transmitting unit, wherein the second transmitting unit And transmits a radio base station identification signal for identifying the radio base station to the radio terminal. The radio terminal receives the radio base station identification signal using the first receiving unit. And is suitable for connection based on the radio base station identification signal. Wireless communication system and transmits further comprising a radio base station selecting means for determining the line base station, the information about the radio base station selected by said base station selecting means to said radio base station. 5. A wireless communication system comprising a wireless terminal and at least one or more wireless base stations for performing wireless communication using radio waves between the wireless terminal, wherein the wireless terminal has a first frequency band. A first transmission unit that performs a first wireless communication with any one or more of the base stations using a first wireless transmission band that uses radio waves of a first frequency band higher than the first frequency band; The second radio communication is performed with any one or more of the radio base stations using radio waves in the second frequency band and using a second radio transmission band faster than the first radio transmission band. A first receiving unit, wherein one of the wireless base stations performs the first wireless communication with the wireless terminal using the first wireless transmission band. Wherein any one of the radio base stations is Using a second wireless transmission band, comprising a second transmission means for performing the second wireless communication with the wireless terminal, the wireless terminal, using the first wireless transmission band, The radio base station further includes third receiving means for performing the first radio communication with any one or more of the radio base stations, and any one of the radio base stations uses the first radio transmission band. The wireless base station further comprising a third transmitting unit that performs the first wireless communication with the wireless terminal, and the wireless base station including the second transmitting unit, wherein the second transmitting unit And transmits a wireless base station identification signal for identifying the own wireless base station to the wireless terminal. The wireless terminal receives the wireless base station identification signal using the first receiving unit. Based on the radio base station identification signal, Wireless base station selecting means for determining a line base station, wherein the wireless base station selecting means determines that a wireless base station other than the currently connected wireless base station is more suitable for connection. And transmitting information on the radio base station selected by the radio base station selecting means to the radio base station. 6. At least one or more wireless communication base stations used in a wireless communication system for performing wireless communication using radio waves with a wireless terminal, the first wireless terminal being provided in the wireless terminal. A second receiving unit for performing a first wireless communication with a transmitting unit using a first wireless transmission band using a radio wave of a first frequency band; a first receiving unit provided in the wireless terminal; Between the receiving means, using a radio wave of a second frequency band higher than the first frequency band and using a second wireless transmission band faster than the first wireless transmission band, A second transmission unit that performs the first wireless communication using the first wireless transmission band between a second transmission unit that performs the second wireless communication and a third reception unit that is provided in the wireless terminal. 3 transmission means, and the first wireless transmission band The first and third transmitting means and the second and third receiving means used perform the first wireless communication in a wide communication area, and use the second wireless transmission band. The transmitting unit and the first receiving unit are connected to the second receiving unit in a narrow communication area.
A wireless communication base station for performing wireless communication of: