JP2586506B2 - Communication method and system for mobile communication - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a communication method and system for mobile communication. Furthermore, the present invention relates to a communication method and a system that satisfies the communication quality when the communication quality deteriorates due to the movement of the communicating mobile terminal in the mobile communication using the small zone configuration.

More specifically, it is an object of the present invention to provide a communication method and a system which are excellent in an effective frequency utilization rate, a communication quality, a control capability of a radio channel, and the like.

[Prior Art] In general, when performing mobile communication in a wide service area, a system in which one radio base station covers the entire area and communicates with a mobile in the service area is called a large zone method. Calling. On the other hand, the small zone method divides a service area into a plurality of small areas, installs one radio base station in each of the divided areas, and sets a mobile radio station in each area. The device communicates with these radio base stations.

The conventional small zone system is adopted, for example, in the car telephone system of NTT (Nippon Telegraph and Telephone Corporation) currently in commercial service. In this case, the mobile radio device mounted in the automobile moves away from the radio base station of the other party of the call due to the traveling of the automobile. As a result, the quality of the call deteriorates. Therefore, in the zone configuration, the radio base stations are installed at an interval of 10 to 12 km from each other in the service area. Therefore, in the above case, there is always another radio base station near the current position of the automobile (within 5 to 6 km). And
A call is continued between the new radio base station and the mobile radio using another radio channel.

In the NTT system, a radio network controller that controls the setting and release of calls on the radio network is installed to control a large number of radio base stations and mobile radios. It is connected to the general telephone network via the gateway exchange. When the call quality deteriorates, the radio network controller causes a plurality of radio base stations in the vicinity of the mobile radio to receive the transmission radio waves of the mobile radio, and a specific radio base station transmits the radio wave to the specific radio base station. If it is determined that the desired communication quality can be maintained by setting a new radio channel between the mobile radio and the radio base station, the new channel is set.

FIG. 9 is a conceptual diagram showing the configuration of a conventional system performing such an operation, and will be described with reference to FIG.

In FIG. 9, each zone 14A, 14B, 14C, 14D having a radius of about 5 to 7 km surrounded by four circles is defined as a service area of a car telephone, and a mobile radio 15 mounted in the car now.
Is communicating with the wireless base station 13A in the zone 14A.
Since the automobile is traveling from zone 14A to zone 14C, the relative distance between radio base station 13A and mobile radio 15 is increasing. Assuming that the communication is ongoing and the vehicle moves from zone 14A to zone 14C, the distance between the radio base station 13A and the mobile radio 15 becomes 5 to 7 km or more, and the input electric field value of the mutually received radio waves And the transmission quality drops below a certain transmission quality.

The state of this quality deterioration is constantly monitored by the radio network controller 12, and when the quality falls below a certain standard, the radio base stations 13B, 13C and 13D around the radio base station 13A are compared with the radio base station 13A. A request is made to measure the quality of the radio channel in use (assumed to be channel CH1) between the station 13A and the mobile radio device 15. Radio base stations 13B, 13 receiving this request
In C and 13D, their own radio channel search receivers (not shown) are tuned to channel CH1 to receive signals, and report the status to radio network controller 12.

Upon receiving this report, the radio network controller 12
13B, @ 13 C, and the received input electric field E _B of 13D, E _C, and compares the value of _{E D, E C> E B} , a E _C> E _D, and also E _C is from the standpoint of the transmission quality After confirming that a certain level of quality is secured, the radio network controller 12 considers that the zone 14A has shifted to the zone 14C, disconnects the radio channel CH1 used in the zone 14A, and A procedure for using an unused channel (assuming the channel CH10) among the radio channels usable by the radio base station 13C in the zone 14C, that is, the channel switching during communication is started.

The following references: Yoshikawa et al. “Car Radio Control”, Nippon Telegraph and Telephone Research Institute of Telecommunications Research and Application Vol.26, No.7
This will be described with reference to page 1885.

(1) The channel switching signal uses a control line included in each transmission line 16 between the radio network controller 12 and each radio base station 13,
A wireless communication channel is used between each wireless base station 13 and the mobile wireless device 15.

(2) The channel switching signal is transmitted from, for example, the radio base station 13A, which had previously communicated, to the mobile radio device 15, and the radio continuity test tone is newly switched, for example, from the radio base station 13C. It is sent to the mobile radio 15.

(3) If the mobile radio 15 cannot receive the radio continuity test tone, it returns to the old communication channel set with the radio base station 13A to continue the communication.

The above (1) to (3) are the channel switching during a call currently used by NTT. As is clear from these descriptions, the following noise is generated in the caller, that is, the car telephone user, in the call. Will be mixed. (A) A control signal for switching according to the above (1) (in this case, a digital signal of 300 bits / second) is received in such a form that it is inserted into a busy channel after the signal of the other party is cut off. Since it appears on the output of the machine, it is mixed during a call as an audible sound of about 300 Hz, during which the call is disconnected.

(B) During the call test (2), there is no noise but no sound. During this period, the other party's voice is not transmitted to the other party, and the own voice is not transmitted to the other party (disconnected).

The duration of the call disconnection in (a) and (b) above is 0.7
It is said to be ~ 0.8 seconds. On the other hand, the radio network controller 12 instructs the radio base station 13C to start a call with the mobile radio device 15 using, for example, the channel CH10 via the transmission path 16C between them. This instruction is also performed at the same time as the above-described continuity test.
Terminates communication with the mobile radio 15 and replaces it with the radio base station.
13C starts communication with the mobile wireless device 15. Further, the radio network controller 12 wirelessly transmits a call path switch SW in the gateway exchange 19 for connecting each radio base station 13 to the telephone network 10 to a gateway exchange 19 which interfaces with the telephone network 10. A request is made to switch from base station 13A to 13C. That is, the A-4 switch is turned off (displayed with a blank triangle) and the C-4 switch is turned on (displayed with a black triangle) with the communication path switch SW in FIG.

By the above operation, using the mobile radio device 15 in the car, any telephone in the telephone network 10 and the car are in the zones 14A,
No matter where you move to 14B, 14C, or 14D, the call will continue.

Thus, the user (caller) is given a technical guarantee that he can make a call anytime and anywhere while driving a car within the service area, and in actual service, he makes full use of this technology. Service has been performed.

In mobile communication adopting such a small zone configuration,
The following features not found in the large zone system can be exhibited.

(A) The radio wave from one radio base station is used only in a small area, and a number of radio base stations are arranged in a service area to repeatedly use the same frequency. Became possible.

(B) With the advent of digital synthesizers, it is possible to switch and use hundreds of radio channels for mobile radios, and to perform radio communication between these many mobile radios and radio base stations. Since the technology for setting and controlling the line has been established, it has become possible to contribute to the effective use of the frequency in the item (a).

(C) The radio channel control technology required for setting and controlling the radio channel for outgoing / incoming calls, etc., has been established efficiently for a large number of mobile radios, which also contributed to the features of (a). It is also possible to switch the wireless channel during a call with a zone change during a call with a wireless device.

[Problems to be Solved by the Invention] However, in the conventional method as exemplified in FIG. 9, technical measures are insufficient or no measures are taken, and users feel inconvenience. There is a problem that satisfactory services cannot be provided, and the system has been required to further promote effective use of frequencies and to improve serviceability.

 Such a problem will be described below.

i) In order to effectively use the frequency, it is necessary to reduce the zone radius of one zone in the small zone configuration, but if this becomes too small, the mobile radio device may pass through one zone during communication. The probability of moving to another zone increases. Then, it is necessary to frequently change the radio channel assigned to each zone at the time of zone transition, and at this time, it is necessary to change the old radio channel to the new radio channel for both the radio base station and the mobile radio. Conventionally, this change was made by the radio network controller 12 (FIG. 9). However, the communication quality was degraded due to a temporary interruption of communication due to the change of the channel.

ii) There has been an example in which mobile wireless devices having different transmission powers are introduced into the same system and operated as devices in one system. This means, for example, a mobile radio installed in a car (5W transmission output for an NTT car phone) and a mobile phone that accesses a radio base station for a car phone that users can carry outdoors. In the case of NTT, the transmission output is 1W), which is housed in the same system. However, since the wireless equipment housed in the wireless base station can be shared, an economical system can be constructed.

However, from the viewpoint of effective use of frequency, in order to complicate the rule making for reuse of the same frequency, in addition to acting in a direction to reduce the effect of effective use,
The difference in the transmission power level increases the possibility of interference caused by other mobile radios. In order to prevent this, the cost was increased and the frequency was not effectively used.

iii) With the progress of sub-zones, in a sub-zone covered by one radio base station, a situation in which the sub-zone covered by an adjacent radio base station or the next adjacent radio base station overlaps often occurs,
When a conventional technique is used as a wireless channel control technique, there is a possibility that control becomes impossible.

This is because the radio wave propagation characteristics are greatly affected (propagation loss) by the influence of the terrain and structures in one small zone. This effect is due to the advancement of small zones in order to make effective use of frequency, and the range of one small zone is reduced (radius 1 km
Below), it becomes relatively large. In addition, a relatively high level transmitter is used for the radio base station and the mobile radio to be used, so that good communication can be ensured even in a place affected by terrain and structures. This means that a wireless base station located far away and a mobile wireless device located in another zone can communicate with each other in a place where there is no influence from the terrain or the structure.

Therefore, one small zone is managed by one radio base station, and the original concept of covering a wide plane serving as a service area disappears by many small zones. A service area has been formed.

As a result, to operate the small zone system in such a state smoothly, in the related art, it is necessary to frequently set, change and release the radio communication path,
As a result, the performance of the radio line controller is greatly exceeded.
Therefore, it is practically impossible to secure a smooth communication path, and conversely, consideration has been given to the system configuration in how to avoid such a situation.

iv) In mobile communication, the communication quality is greatly changed due to the influence of radio wave propagation characteristics accompanying the movement of the mobile body, and the communication quality is required for the system in places where radio waves are poorly transmitted. There was a problem that the value was less than the value. In order to solve this, various measures such as diversity technology have been taken, but all of them have problems such as not only increasing the cost of the equipment but also impairing the effective use of the frequency.

In addition, it is considered that a call disconnection due to a shift between zones during a call is a kind of communication quality problem, and a solution is required from the viewpoint of quality assurance.

v) No measures have been taken against traffic fluctuations in communication within the system.

Traffic fluctuations in the communication within the system, for example, are usually extremely low in the middle of the night or early morning in public communication, and large traffic peaks occur around 10 am and 2 pm during the day, and 5 to 6 pm in the case of car telephones. However, if the system design is designed to function satisfactorily even at the time of maximum traffic, the system components will be idle when the time is off, and the cost will increase. Although the cost was extremely low, it was unavailable during the busiest time, and a decline in serviceability could not be avoided.

In addition, when communication traffic is low, high-quality services can be provided by effectively utilizing idle facilities in the system, and the system facilities that shift to normal services as traffic increases can be used effectively. It lacked the concept of using it. One of the reasons for this is considered to be a sudden increase in system cost when trying to solve the problem by the conventional technology.

Also, for example, when all the transceivers of the wireless base station are in use, even a very short and fixed signal such as a position registration signal transmitted from a mobile wireless device has no processing capability in the conventional system. However, it has been a technical constraint on the progress of the miniaturization.

vi) Conventionally, location registration of a mobile unit performing communication has been performed by registering and processing only data received by one radio base station at the same time. In a system that changes sequentially at a considerable frequency, or in a system in which the location registration method is restricted due to the effective use of frequency, a call to a mobile unit cannot be made due to insufficient location registration.

This is because the wireless transceiver installed in the wireless base station is one
When only a channel is used, it must be used in a time-sharing manner for control and communication, and when there is a location registration request from another mobile radio in the same zone while communicating with the mobile radio. Had noticeable adverse effects.

vii) The technology for providing mobile communication services using broadband signals is incomplete and unfinished, giving users inconvenience.

Conventionally, mobile communication services that are widely used are mainly telephones, and those that use a wide frequency band, such as high-speed data signals, are rarely used. This is because, in mobile communication, since the radio wave propagation characteristics change greatly with the movement of the mobile body, there has been a shortage of techniques for receiving wideband signals satisfactorily.

viii) In conventional land-based mobile communication, except for special cases, estimation of the moving direction of a moving body during communication has not been performed due to technical difficulties. For this reason, effective information such as the radio link traffic situation in the area in the moving direction cannot be obtained, and a problem remains in effective use of frequency or traffic management.

ix) Instantaneous interruption occurs when switching channels during a call between zones or within a zone, which has also been a major obstacle to miniaturization.

In the call channel switching method implemented by NTT described with reference to FIG. 9, the call is temporarily disconnected (0.7 to 0.8 seconds) when the wireless channel is switched, and a control signal other than the call signal (300 bits) is used. / S) is partly mixed and has a drawback. If there is such a temporary interruption of the call line or noise is mixed in, if the content of the call is voice, it can be compensated by re-listening, etc.
Although not a major obstacle, when a facsimile terminal is installed in a car and used for transmission and reception, if there is a channel change during operation, for example, in a 1-minute facsimile, the 0.8 / 60 portion of the page will be marked with a black line ( Or a white line), and the received image quality is greatly deteriorated.
In the case of data communication, for example, in a data signal of 1200 baud, a signal of about 1000 bits is lost, so a procedure such as retransmission is required.

In addition, there is a method of removing noise by using silence during channel switching or using out-of-band signals in order to remove noise.However, even if the purpose of removing the noise can be achieved, the time of line disconnection is still Because of its existence, there remains a problem that it has no effect at all in removing the adverse effects on facsimile and data signals.

[Means for Solving the Problems] A plurality of wireless base stations including a wireless transceiver and an ID identification storage unit, a group of switches connecting a plurality of wireless base stations and a telephone network via a gateway exchange, and the group of switches A radio system controller including a communication control unit for controlling the operation, an ID identification storage unit, and an S / N monitoring unit for monitoring a signal-to-noise ratio received by each radio base station, and the plurality of radio base stations. While simultaneously moving within the service area covered by, to simultaneously communicate the same communication signal with a plurality of radio base stations, simultaneously switch the plurality of channels at a speed sufficiently faster than the frequency of the communication signal to receive (diversity) A mobile radio including a radio receiving circuit for performing reception and a radio transmitting circuit for simultaneously transmitting (diversity transmission) by switching a plurality of channels at a speed sufficiently higher than the frequency of the communication signal. You configure the system, including.

[Operation] A plurality of radio base stations and a mobile radio are communicating in parallel by using a plurality of channels to switch the same communication content at a speed sufficiently higher than the frequency of the communication signal. When a channel (old channel) in which the communication quality has become equal to or less than a certain value occurs in the radio system controller detecting this, another channel that satisfies the certain communication quality is used.
The communication with the old channel is terminated by switching to another one channel (new channel) with one radio base station, and the same communication content is instantaneously interrupted by diversity transmission and reception using a plurality of channels including the new channel. Communication was enabled. As a result, the following actions and effects could be obtained.

i) Each wireless base station and the wireless system control device are provided with an ID identification storage unit, and the position of the mobile wireless device is registered in parallel based on the data of each wireless base station. Improved.

ii) Diversity transmission / reception is performed by switching one channel having deteriorated communication quality among a plurality of channels to a new channel, so that communication (communication) between or within zones is performed.
Instantaneous interruption of medium channel switching was realized.

iii) The use of economical transmission / reception diversity has ensured good communication quality, that is, reduced interference and technically enabled new services using wideband signals.

iv) When traffic is low, parallel communication is performed using many channels, so that effective use of wireless equipment is achieved and communication quality is improved.

v) Each radio base station is provided with an ID identification storage unit and a function that enables simultaneous transmission / reception (diversity transmission / reception) of a plurality of radio channels by high-speed switching, so that the location registration signal from the mobile radio device can be used even during peak traffic. Processing became possible.

vi) The transmission characteristics of wideband signals were improved by the parallel communication of multiple channels, and the line quality was improved.

vii) It is possible to estimate the moving direction and speed of the mobile wireless device, to secure communication in the destination zone and to perform prior allocation of channels used in the expected destination zone.

Embodiment FIG. 1A, FIG. 1B, and FIG. 1C show an example of a system configuration for explaining an embodiment of the present invention.

In FIG. 1A, reference numeral 10 denotes a general telephone network, which includes an exchange for general telephones. Reference numeral 19 denotes a gateway exchange for exchange-connecting an ordinary telephone exchange included in the telephone network 10 with a wireless system. Reference numeral 20 denotes a radio system controller for connecting a plurality of radio base stations 30-1, 30-2,..., 30-n and many mobile radios to a telephone housed in the general telephone network 10. The communication control unit 21 performs transmission and reception of control signals between each of the wireless base stations 30-1 to 30-n, and also controls release of a communication path and the like. A switch group 23 necessary for switching a communication path for making a connection between the base stations 30-1 to 30-n and the gateway exchange 19 is included.

FIG. 1B shows a mobile radio device 50 communicating with each of the radio base stations 30-1 and 30-2. The reception signal received by the antenna unit enters a wireless reception circuit 68 including a reception mixer 63 and a reception unit 53, and a communication signal output from the reception unit is input to a control unit 58 and a telephone unit 59. A communication signal output from the telephone unit 59 is transmitted to a wireless transmission circuit including a transmission mixer 61 and a transmission unit 51.
66, the transmission signal is transmitted from the antenna unit,
Received by the wireless base station 30. Also, the presence or absence of interference during communication is monitored, and when a certain amount or more of interference is detected, the ID of the interference detector 62 and the mobile radio 50 of its own are reported to the control unit 58 when the interference is detected. An ID / Roam / Area information collation storage unit 54 for identifying which zone the user is in and for storing is provided with connections as shown in the figure.

The mobile radio 50 further includes synthesizers 55-1 and 55-
2,…, 55-n and 56-1,56-2,…, 56-n and changeover switch 64
-1, 64-2 and a reception switching controller 65C that generates a signal for performing switching control of the changeover switches 64-1 and 64-2, respectively.
And a transmission switching controller 67C, and the synthesizers 55-1 to 55-n and 56-1 to 56-n, and both switching controllers 65C and 67C are controlled by the control unit 58. A reference frequency is supplied from a reference crystal oscillator 71 to each of the synthesizers 55-1 to 55-n and 56-1 to 56-n.

FIG. 1C shows a radio base station communicating with the mobile radio 50.
Reference numeral 30 (for example, 30-1) is shown, which is substantially the same as the configuration of the mobile radio device 50 shown in FIG. 1B, and differs from the transmission and reception switching controllers 55-1 to 55-. n, 56-1〜56-
n, changeover switches 64-1 and 64 for switching the synthesizer
-2, and the synthesizer is for receiving and transmitting 35-1,36-
1 and an ID identification storage unit 34 for identifying and storing the ID numbers of itself and the call destination, and a control unit 38 for constantly monitoring and deteriorating the call quality during communication. Telephone quality monitoring section 37
59 (FIG. 1B) is provided, and an interface 39 to the wireless system control device 20 instead of the telephone unit 59 is provided.

Components of FIG. 1C corresponding to FIG. 1B are listed below, and description of each function is omitted. Here, the numbers in parentheses are the numbers of the corresponding components in FIG. 1B.

Transmitter 31 (51) Receiver 33 (53) Synthesizer 35-1 (55-1 to 55-n) Synthesizer 36-1 (56-1 to 56-n) Controller 38 (58) Reference crystal oscillator 40 (71 ) Transmit mixer 41 (61) Interference detector 42 (62) Receive mixer 43 (63) Radio transmitter circuit 46 (66) Radio receiver circuit 48 (68) In FIG. 1D, communication with the mobile radio 50 is performed. Wireless base station
Another embodiment 30B of 30 (eg 30-1) is shown,
The configuration is almost the same as the configuration of the mobile wireless device 50 shown in FIG. 1B,
The difference is that the ID / ROHM / area information collation storage unit 54
There is no (FIG. 1B), and the ID identification storage unit 34 for identifying and storing the ID number of the self and the call destination, and the communication quality during communication is constantly monitored, and when it deteriorates, the quality is reported to the control unit 38. It has a communication quality monitoring unit 37, does not have a telephone unit 59 (FIG. 1B), and is provided with an interface 39 to the wireless system control device 20 instead of the telephone unit 59.

Each component corresponding to FIG. 1B in FIG. 1D is listed below, and description of each function is omitted. Here, the numbers in parentheses are the numbers of the corresponding components in FIG. 1B.

Transmitter 31 (51) Receiver 33 (53) Synthesizer 35-1 to 35-n (55-1 to 55-n) Synthesizer 36-1 to 36-n (56-1 to 56-n) Controller 38B ( 58) Reference crystal oscillator 40 (71) Transmit mixer 41 (61) Interference detector 42 (62) Receive mixer 43 (63) Radio transmitter circuit 46 (66) Radio receiver circuit 48 (68) FIG. Another embodiment of the station 30 is shown, wherein a wireless base station 30C including a plurality of transceivers shares a transceiver 90- for many calls (communications) sharing an antenna sharing device 96 and a wireless base station controller 32. 1 to 90-m, m communication quality monitoring receivers 93-1 to 93-m having both functions of the wireless reception circuit 48 and the communication quality monitoring unit 37 shown in FIG. A control transceiver 94 dedicated to the control channel is shown, and is connected to the telephone network 10 via the radio network controller 20 and the gateway exchange 19.

The configuration of one of the transceivers 90-1 to 90-m used in FIG. 1E is shown in FIG. 1F, and the ID identification storage unit included in the radio base station controller 32 is shown in FIG. The connection relationship with 34C, the control unit 38C, and the reference crystal oscillator 40C is shown.

The transceiver 90 shown in FIG. 1F has almost the same configuration as the radio base station 30B shown in FIG. 1D, and many transceivers 90 have an ID identification storage unit 34C, a control unit 38C and The reference crystal oscillator 40C is shared.

Since the transceivers 90-1 to 90-m shown in FIG. 1E use such a configuration, the changeover switches 44-1 and 44-2 provide
If a particular one of the synthesizers 35-1 to 35-n and 36-1 to 36-n is selected,
The radio base station 30C shown in FIG. 1E can simultaneously transmit and receive m channels.

Also, if the changeover switches 44-1 and 44-2 of the transceiver 90 are operated, and the synthesizers 35-1 to 35-n and 36-1 to 36-n are chopped at high speed and repeatedly switched, It is possible for one transceiver 90 to simultaneously transmit and receive n channels. Therefore, the radio base station 30C shown in FIG. 1E can simultaneously transmit and receive m × n channels at the maximum.

FIG. 1G shows another embodiment of the mobile wireless device 50.

The difference between the mobile radio 50B of FIG. 1G and the mobile radio 50 shown in FIG. 1B is that, in addition to the radio reception circuit 68 including the reception mixer 63 and the reception unit 53, the reception mixer 73 and the C / N measurement Receivers 52 are provided, and the synthesizers 55-1 to 55-n are provided to both reception mixers 63 and 73 via changeover switches 64-1 and 64-3 controlled by a reception changeover controller 65C and a control unit 58B, respectively.
And the transmission mixer 61 has a transmission switching controller 67
The point is that the outputs of the synthesizers 56-1 to 56-n are applied via the changeover switch 64-2 controlled by C.

The mobile radio device 50B shown in FIG. 1G has a function having a particularly remarkable reception diversity effect. A part of the reception signal received by the antenna unit of the mobile radio device 50 is added to the reception mixer 73. Outputs from the synthesizers 55-1 to 55-n are added as local oscillation frequencies to the reception mixer 73 via the changeover switch 64-3. The changeover switch 64-3 does not need to be switched at a high speed like the other changeover switches 64-1 and 64-2, and a low changeover speed of, for example, about 10 Hz is sufficient. Changeover switch 64-3 is synthesizer 55
When at the position where an output of −1 is obtained, the C / N value (the value of the carrier-to-noise ratio) of the channel CH1 measured by the C / N measurement receiving unit 52 is transmitted to the control unit 58B. Next, when the changeover switch 64-3 is in the position for obtaining the output of the synthesizer 55-2, the channel
Measure the C / N value of CH2. Hereinafter, when the output of the synthesizer 55-n is sequentially turned on, the C / N value of CHn is measured and transmitted to the control unit 58B. The control unit 58B uses these values to control the switching frequency of the reception switching controller 65C and the transmission switching controller 67C, for example, to operate at a speed inversely proportional to the C / N value, respectively.

Next, a system for further increasing the reception diversity effect will be described. Figure 1H shows the mobile radio in this case.
An example of the configuration of 50C is shown.

In FIG. 1H, an input radio wave (input signal) to the mobile radio device 50C is divided into n equal parts at the antenna input part, and arrives at the radio receiving circuits 68-1, 68-2,..., 68-n, respectively. Each wireless receiving circuit 6
8-1 to 68-n receive mixers 63-1, 63-2, ..., 63-n, respectively.
, 53-n are provided, and the reception mixers 63-1 to 63-n have synthesizers 55-1 and 55-n respectively.
Local oscillation frequencies from 2, ..., 55-n are input. Therefore, in the configuration shown in FIG. 1, there is no reception changeover switch 64-1 shown in FIG. 1B or the like, and it is possible to always receive and demodulate the signals of the wireless channels CH1, CH2,..., CHn. A part of the output signals of the receiving units 53-1 to 53-n is sent to the control unit 58C, and the other part is added to the mixing circuit 69, and is added to a normal diversity receiver (in this case, after detection and synthesis). The processing is added in the same manner as in ()) and sent to the telephone unit 59.

FIG. 1I shows a mobile radio device 50D different from the mobile radio device 50C shown in FIG. 1H, and the difference is that the n transmission mixers 61-1 to 61-n, the transmission unit 51- It comprises wireless transmission circuits 66-1 to 66-n including 1 to 51-n, and each transmission unit 51-1 to 51-n includes:
The signals to be transmitted are connected in common and applied, and the control unit 58D
Output from the synthesizers 56-1 to 56-n, each of which is controlled and generates the designated frequency, by each transmission mixer.
61-1 to 61-n. This mobile radio 50D
As in the case of the mobile radio device 50C (FIG. 1H), a plurality of radio channels can be continuously transmitted without being chopped by the changeover switch 64-2.

By employing the circuit configuration shown in FIGS. 1H and 1I, a large diversity effect can be obtained.

The control signal between the mobile radio device 50 (B, C, D) and the radio base station 30 (B, C) or the radio network controller 20 is different from the case where a control channel dedicated to the control signal is used and the communication ( Talk) There are cases where the out-of-band signal is used.

In order to transmit this control signal outside the band of the communication (talk) signal, specifically, when the control signal is an analog signal, as shown in FIG.
A low frequency f _D0 outside KHz (for example, about 100 Hz) or a high frequency f _D1 , f _D2 , f _D3 ... F _D8 (for example, eight waves from 3.8 KHz to 4.5 KHz at intervals of 0.1 KHz) is used.

When there are many items to control, that is, control data,
May be further increased wavenumber frequency f _D0 ~f _D8 for control, it is also possible to take the subcarrier format. In this case, for example, or apply frequency modulation to the 1-wave or a plurality of waves of f _D0 ~f _D8, or by or multiplied by amplitude modulation, it is also possible to transmit more control data.

When a digital data signal is used as the control signal, it is also possible to digitally encode the voice signal and transmit the signals in a time-division multiplexed manner, as shown in FIG. 2 (b). FIG. 2 (b) shows an example in which the audio signal is digitized by the digital encoding circuit 91, the data signal and the data signal are multiplex-converted by the multiplex conversion circuit 92, and applied to the modulation circuit of the transmission unit 31.

The mobile radio 50 (B, C, D) and the radio base station 30 (B,
C) and the function of the radio system controller 20 will be described sequentially.

(A) Mobile Radio 50 (B, C, D) First, among the functions provided in the mobile radio 50 (B, C, D), the function of the control unit 58 (B, C, D) will be described. Control unit 5
8 (B, C, D) first has the following functions as basic functions.

i) Instruct the wireless transmission circuit 66 of the own mobile wireless device 50 (B, C, D) to emit or stop transmission of radio waves and control the transmission power level.

ii) A radio wave reception instruction or a stop instruction to the radio reception circuit 68 of the mobile radio device 50 (B, C, D).

iii) A dial signal transmission enable / disable instruction and a voice transmission / reception instruction for the telephone unit 59.

iv) Oscillation frequency (channel) designation, oscillation command and stop command for synthesizer groups 55-1 to 55-n and 56-1 to 56-n.

v) A control command to the reception and transmission switching controllers 65C and 67C.

vi) Change of one or more channels used by an instruction from the radio system controller 20.

vii) Request the radio system controller to change the channel used based on the information from the interference detector 62.

viii) Confirmation of the ID of the other party to communicate with, based on the information from the ID / roam area information collation storage unit 54.

ix) Transfer of a communication channel to a higher-order mobile wireless device of the service type in accordance with an instruction from the wireless system controller 20.

x) Reception (transmission) switching controller 65C, 67C
Determining off duty conditions.

xi) Based on the report from the radio system controller 20, the own mobile radio 50
Estimation of the moving direction and moving speed of (B, C, D,).

Next, by using the functions of i) to xi) in combination, the following applied functions can be provided.

1) The radio channel used by another mobile radio device or another radio base station operating around the own mobile radio device 50 (B, C, D) is stored in the ID / ROHM area information collation storage unit 54. Remember
Use when making a call or switching communication channels.

2) Using the functions of i), vi) and vii), the mobile radio 5
Setting of optimal transmission level for 0 (B, C, D).

3) One application of the function of 2) is to determine an optimal signal speed for digital signal transmission.

4) The optimum use channel can be determined according to the type of communication (telephone, fax data, etc.).

5) The channel switching operation is performed without interruption during communication.

(B) Radio base station 30 (B, C) The radio base station 30 is set with devices having the following functions.

a) Each radio base station has a dedicated radio transceiver for transmitting and receiving a small number (usually one) of control channels and a number corresponding to the number of communication channels dedicated to the communication channel and assigned to the radio base station. Wireless transceivers are installed. For example, assume the wireless base station 30C in FIG. 1E. The optimum number of communication channels to be assigned to one radio base station 30C is given by the communication traffic of the mobile radios 50 (B, C) existing in the small zone in which it is assigned. If the area of the zone is large and there are many mobile radios in the area, the call traffic will inevitably increase,
At least one control channel and a plurality of communication channels are required, and a plurality of transceivers 90 (FIG. 1F) are naturally required. In the case of a metropolitan city in the NTT car telephone system, there is an example in which two control channels and up to about 60 communication channels are allocated.

However, the size of the zone gradually became smaller, and finally, as shown in the above-mentioned document, Ito “Proposal of Cellular Phone System,” CS-86-88, Communication System Study Group, Communication Society, November 1986, a radius of 25 m In the case of a very small zone, the radio base station serving this area as a service area takes control and communication as 1 as a radio channel installed there in terms of call traffic and system and cost, and covers this. The function of the radio is 1
It may be sent and received. That is, one transceiver is used for both control and communication (see FIG. 1D).
In addition, this dual purpose is to respond to a call from a certain mobile radio as in the conventional system by using a control channel at first, and after specifying a vacant communication channel, change the communication channel itself to the same communication channel. It is not a simple method of executing communication with a mobile radio, but does not disturb a radio frequency to be transmitted / received as described later even during communication using one mobile radio and a communication channel as described later. A mobile radio that desires a new outgoing / incoming call by repeatedly switching between the call channel and the control channel at such a switching speed
The feature of the present invention is that it has an excellent function of accepting outgoing / incoming calls even for 50 (B, C, D) and enabling a call.

As described above, various cases can be considered for the configuration of the radio base station 30 (B, C), but the present invention can be applied to all cases.

However, only one set of transmission / reception units is shown in the radio base station 30 of FIG. 1A, and the rest is omitted.

b) The transceiver dedicated to the communication channel installed in each radio base station 30 (B, C) can receive one of a plurality of radio channels among the radio channels assigned to the radio base station. Needless to say, in a zone where traffic fluctuation is high, the radio base station 30C
It is assumed that one transceiver 90 installed in (FIG. 1E) has a configuration as shown in FIG. 1F. That is, the configuration of the portion that transmits and receives wireless signals is substantially the same as the configuration of the mobile wireless device 50 shown in FIG. 1B.

As a result, the call traffic in this zone increases, and the wireless base station 30C in which the number of the transceivers 90 is installed to provide the communication for m channels in general, also increases the communication traffic to m channels or more due to the increase in the call traffic. If necessary, the control unit 38C in the base station sends a signal to one transceiver 90 constituting the radio base station 30C by using a control signal sent from the control unit 38C. , 35-n and 36-2, 36-3,..., 36-n and the changeover switches 44-1 and 44-2 are operated. As a result, transmission and reception of a maximum of m × n channels becomes possible instead of transmission and reception of the conventional m channels. The number of channels that can talk simultaneously increases dramatically.

However, the transmission power of each channel decreases according to the number of switching unless a power amplifier is added to the output of the transmission mixer 61, so it is necessary to pay attention to this point, and the total number of channels given to the system is Will be the upper limit. Alternatively, in the case where interference is given to a channel that is communicating in another zone, the number of channels less than the limit is reached. In addition, it is natural that the signal band must be restricted so that the communication signal does not overlap between channels in the baseband frequency band.

The radio base station 30B in FIG. 1D has only one transceiver, and in a system employing a method in which the transceiver is shared by the control channel and the communication channel, one mobile radio 50
(B, C, D) while using the call channel,
As described above, by repeatedly switching the communication channel and the control channel at a switching speed that does not disturb the radio frequency to be transmitted and received, the mobile radio device 50 (B, C, D ), Mobile phones with different priorities accepting incoming and outgoing call operations, and the channel can be transferred to the mobile phone that is currently talking to the one that wants to make a new call. It can be.

(C) Radio System Controller 20 As shown in FIG. 1A, the radio system controller 20 includes a mobile radio 50 (B, C, D) radio base station 30 (B, C) radio system controller 20 and a gateway switch. 19 Telephone call with telephone network 10 (telephone subscriber)
Functions such as setting and canceling of a route, change processing of location registration when a mobile wireless device moves between zones, and switching of a channel during a call (communication) are provided. Specifically, the wireless system control device 20 has each function as shown in FIG. 1A.
This will be described below.

a) Based on the report from each radio base station 30 (B, C) that has received the position registration signal (using the control channel) from the mobile radio 50 (B, C, D), the mobile radio 50 (B, C, D) C, D) ID
(Self-identification information) via the communication control unit 21 to the ID identification storage unit
Store to 24. In this case, in the present invention, a plurality of radio base stations 30
Since the location registration request is made from (B, C), the mobile radio 5
In addition to the ID of 0, the ID of the wireless base station 30 (B, C) and the wireless base station
The quality (decibel value of S / N, C / N, etc.) of the signal received at 30 (B, C) is also stored.

b) Based on the report from each radio base station 30 (B, C) that has received the call signal (using the control channel) from the mobile radio 50 (B, C, D), the radio base station with the best received signal quality Bureau 30
(B, C) or the next best radio base station 30 (B, C) is selected, and the mobile radio 50 (B, C, D) is selected from the radio channel assigned to that radio base station. The communication channel number that is not used at the time to be communicated with the mobile radio 50 (B, C,
A command signal to stop communication with D) is sent.

c) Execution of the operation of the switch group 23 to be opened / closed in connection with the call from the mobile radio device 50 (B, C, D) in b), and when the called party is included in the telephone network 10. Is the transmission of information necessary for setting up a call with the called party addressed to the gateway exchange 19.

d) When an incoming call signal to the mobile radio 50 (B, C, D) is transmitted from the caller included in the telephone network 10 via the gateway exchange 19, the communication control unit 21 Executing the operation of the switch group 23 to be opened / closed, and confirming the current position of the called mobile radio device 50 (B, C, D) by searching the ID identification storage unit 24.

e) A radio base covering the zone in which the current location of the called mobile radio 50 (B, C, D) is registered in connection with the incoming call to the mobile radio 50 (B, C, D) in d). An instruction to send a calling signal to the station 30 (B, C). First, the call signal is transmitted to the mobile radio 50 (B,
All wireless base stations 3 whose current location is registered in C, D)
0 (B, C), and each radio base station 30 (B,
C), the mobile radio 50 (B, C,
D) Send the incoming call signal at the same time. However, this transmission time does not necessarily have to be the same time, and each radio base station
The data may be sequentially transmitted in time series every 30 (B, C). That is, it is only necessary to take measures to avoid interference due to the time difference between signals.

f) After the self-mobile radio device 50 (B, C, D) starts a call, if communication traffic conditions in the system can be permitted, an approval for transmission / reception diversity implementation and an instruction to perform the operation.

g) Mobile radio 50 (B,
C, D), when traffic congestion or calling of important subscribers or a broadband signal service applicant appears at that time, the reduction of the multiplicity of transmission / reception diversity (the number of channels used) or the suspension of diversity. Judgment and execution.

h) According to a) to e), the own mobile radio device 50 (B,
C, D), if the communication quality with the radio base station 30 (B, C) deteriorates within the same zone due to the movement of the place or when the zone is changed and the communication is performed (talk) An instruction to perform the operation of the medium channel switching. In order to perform this operation, it is necessary to send a control signal to the opposite radio base station 30 (B, C).
As shown in FIG. 2 (a), the communication is performed using a speech channel and using the upper or lower frequency band of the frequency band of the speech signal.

i) When the mobile radio 50 (B, C, D) moves,
By measuring the change in the reception quality of each of the radio base stations 30 (B, C) communicating with each other, the moving direction and the moving speed of the mobile radio device 50 (B, C, D) are estimated, and the Machine (B, C,
D) comprehensively determine the traffic state (use state of the communication channel) in the radio base station 30 (B, C) in the moving direction of
If necessary, an instruction is made to decrease or increase the multiplicity of transmission / reception diversity of the mobile radios 50 (B, C, D) communicating with these radio base stations 30 (B, C).

Next, the operation of the entire system will be described in the following order.

(1) Location registration (2) Outgoing call operation (3) Incoming call operation (4) Application of diversity when traffic is low (5) Explanation and theoretical basis of channel switching during call and diversity effect.

(6) A communication channel assignment method for estimating the moving direction and moving speed of a mobile radio device and taking measures against traffic congestion.

(7) Reducing the switching frequency of the repetitive switching applied at the time of channel switching during a call or the like.

(1) Location Registration In the home area where the mobile radio 50 (B, C, D) is permanently located, or in the roam area where service is provided outside the home area, the radio system controller 20 and its surroundings have already been registered. When the power switch of the mobile radio device 50 (B, C, D) is turned on while the radio base stations 30-1 to 30-n are operating and the operation is started, the position performed first is This is a registration operation. The flow of this position registration operation will be described with reference to FIGS. 4A and 4B.

When the power switch of the mobile radio device 50 (B, C, D) is turned on, a signal for starting an operation for registering the current position is transmitted to a nearby radio base station using the uplink control channel (CH). 30-1 to 30-n (S201, 4A
Figure).

Upon receiving the operation start signal from the mobile radio device 50 (B, C, D) (S202), the radio base station 30 transmits the mobile radio device 50 (B, C, D).
Confirm the operation start of D) (S203), and if confirmed (S203YE
S) If the downlink control channel is in the off state, it is turned on, and the location registration signal transmission permission is transmitted using the downlink control channel (S204).

Upon receiving the location registration signal transmission permission (S205), the mobile wireless device 50 (B, C, D) transmits a location registration signal with its own ID (identification number) using an uplink control channel ( S206). Communication using this control channel is performed without a transmission / reception unit dedicated to the control channel. For example, even in the radio base station 30B shown in FIG. 1D, the radio transmission / reception circuits 46 and 48 have already communicated with other mobile radio devices. Therefore, even when used in a plurality of channels, a plurality of channels can be chopped at a high speed and simultaneously transmitted and received.

Upon receiving the location registration signal (S207), the wireless base station 30
In (B, C), the reception quality is checked, and the ID
Is stored (S208). If the reception quality is not less than a certain value as a result of the inspection (S209 YES, FIG. 4B), a position registration request signal is transmitted to the radio network controller 20 (S210). Upon receiving this registration request signal (S211), the radio network controller 20 registers that the reception quality and the location are stored in the plurality of radio base stations 30-1 to 30-n (S212). When this registration work is completed, a registration completion signal is sent (S213).
In the radio base station 30 (B, C) receiving the registration completion signal, the mobile radio 50 (B, C, D) uses the downlink control channel.
Transfer to

The mobile radio 50 (B, C,
D) Each radio base station 30 registered by inspecting the received content
The ID (identification number) of (B, C) is stored in the ID roam area information collation storage unit 54 (S216).

With the above operation, the position registration operation ends, and the system enters a standby state for an incoming call.

As is clear from the above description, the location registration of the mobile radio device 50 (B, C, D) in the mobile communication system according to the present invention differs from the conventional system in that it is registered at a plurality of locations (units of radio base stations). Will be done. This represents one feature of the present invention.

In addition, the radio base station 30 (B, C) and the radio system controller 2
0 indicates that the mobile radio 50
The quality of the location registration signal sent from (B, C, D) is measured and stored including the value. Therefore, for example, the radio system controller 20 stores the position registration signal of the mobile radio device 30 (B, C, D) by using the radio base station having the higher reception quality.
Along with the ID of 30 (B, C), for example, it is stored in the order of good reception quality as shown below.

Similarly, each wireless base station stores not only information received by its own wireless base station 30 (B, C) but also received information of peripheral wireless base stations as shown in Table 1. This is a mobile radio 50
(B, C, D) when the communication path is set
Not only is it useful information when switching channels during a call (communication) accompanying the movement of 0 (B, C, D), but also the moving direction and speed of the mobile radio 50 (B, C, D). It is necessary to make an estimate.

For the same reason as above, mobile radio 50 (B, C, D)
The ID roam / area information collating and storing section 54 stores the same information as in Table 1.

Next, it is assumed that the mobile radio device 50 (B, C, D) moves from the zone in which the location has been registered during standby (when no call is made) and shifts to an adjacent zone. For example, in a system in which a control signal is constantly transmitted from the wireless base station 30 (B, C), the ID of the wireless base station 30 (B, C) included in the received control signal is determined by recognizing the movement. It can be determined by collating with the ID stored in the own mobile radio device 50 (B, C, D).

In a system in which a control signal is not always transmitted from the wireless base station 30 (B, C, D), the mobile wireless device 50 (B, C, D) transmits the signal from the surrounding wireless base station 30 (B, C, D) at predetermined time intervals. C), a downlink control signal transmission request is made using the uplink control channel, and the ID of the radio base station 30 (B, C) transmitted from each radio base station 30 (B, C) is moved accordingly. This is possible by collating with the ID information stored in the wireless device 50 (B, C, D).

In any of the above systems, of the ID information of the radio base station 30 (B, C) obtained as a result, the base station ID information previously stored in the own mobile radio device 50 (B, C, D) If it is found that there is at least one new base station ID information different from the new base station ID, the own mobile radio device 50 (B, C, D) determines that it has shifted to the new zone and the control unit 58 (B, C) (1st B
(Refer to the figure.) Executes the update of the position registration in the ID roam area information collation storage unit 54. That is, the ID information of the own mobile radio device 50 (B, C, D) is transmitted to the surrounding radio base station 30 (B, C) using the uplink control channel.

The plurality of radio base stations 30 (B,
In C), the same procedure as described above is performed, and a position registration signal of the mobile radio device 50 (B, C, D) is transmitted to the radio system controller 20. Upon receiving this signal, the wireless system control device 20 operates the ID identification storage unit 24 in the own device to operate the mobile wireless device 50.
As the location registration information of (B, C, D), the existing information is rewritten to new information. Thereby, the mobile radio 50 (B,
C, D) location registration is updated.

The above update work is necessary because the mobile radios 50 (B, C, D) are in standby mode, and when moving to a new zone during communication (talk), the Control device 20
, When a new call channel is allocated between the new radio base station (B, C) and the mobile radio 50 (B, C, D), the location registration is updated at the same time, so no special action is required It is.

Note that in a system in which the number of radios installed in the radio base station 30 (B, C) is small and the radio for the control channel is diverted to the communication channel, the radio base station 30 (B, C) is not used. When the mobile phone is communicating with the mobile radio 50 (B, C, D) of another mobile radio, there is no other radio in standby using the conventional technology, so even if a location registration request is issued from another mobile radio. Even so, the call was invalid. However, as a configuration of a mobile radio,
For example, as shown in FIG.
55-n, 56-1 to 56-n and changeover switches 64-1 and 64-2, etc., are already communicating with other mobile radios by a method of repeatedly switching while chopping transmission / reception channels. However, it is possible to communicate with a newly called mobile wireless device using a control channel. Therefore, location registration can be accepted.

(2) Calling operation The calling operation from the mobile radio device 50 (B, C, D) will be described.

The mobile radio 50 (B, C, D) is powered on,
It is assumed that the location registration described in (1) has been completed. The calling operation when the mobile radio 50 (B, C, D) calls another mobile radio in the same system or a telephone accommodated in the telephone network 10 shown in FIG. A dial operation is performed in the same manner as a call from a used mobile phone.

Now, the user performs the operation of raising (hanging off) the handset of the telephone unit 59 of the mobile wireless device 50 shown in FIG. 1B. In this state, the outgoing call signal transmitted from the mobile radio 50 is transmitted to the uplink control channel (mobile radio 50
The control unit 58 of the own mobile radio device 50 knows whether or not to transmit to the radio base station 30 (B, C)). That is, at the time of a call waiting state before the calling state, a plurality of radio base stations 30 (B, C)
Downlink control channel (wireless base station 30
This is because the mobile radio device 50 captures the mobile radio device 50) from (B, C), and recognizes the timing at which the control signal contained therein can be called.

However, in a system where the downlink control signal is not always transmitted from the wireless base station 30 (B, C), the mobile
The radio base station 30 (B, C) receives the uplink control signal from the radio base station 50, and in response to the call, calls the radio base station 50 that desires to make a call in a downlink control channel transmitted from a plurality of radio base stations. The timing is included.

In the mobile radio 50, all the functions shown in FIG. 1B are active. In particular, synthesizers 55-1,55-2,…, 55-n
Is prepared for local oscillation frequency oscillation, but the changeover switch 64-1 maintains a state in which the synthesizer 55-1 is fixed at a position to be selected. The control unit 58 sends a control signal to the synthesizer 55-1 to oscillate a local oscillation frequency for receiving a downlink control channel. On the other hand, in the radio base stations 30-1, 30-2, ..., 30-n around the mobile radio 50,
If there is only one wireless device in the wireless base station, the next operation is to receive an uplink control signal from the mobile wireless device 50 depending on whether or not communication is being performed with another mobile wireless device.

First, the radio base station 30 (B, C) that is communicating with another mobile radio at that time, includes the reception and transmission switching controllers 65C, 67C in the radio base station 30 (B, C) and the synthesizer. Five
5-1,55-2,56-1,56-2 are in operation, of which 55-1,56-
1 outputs a local oscillation frequency necessary for communication with another mobile radio, and synthesizers 55-2 and 56-2 output a local oscillation frequency which requires communication on a control channel. Therefore, the mobile phone 50 in the vicinity of the own radio base station 30 (B, C) maintains a state where it can immediately respond to a call.

Next, at that time there was no communication with other mobile radios,
In the radio base station 30 (B, C) waiting on the control channel, the reception state of the radio reception circuit 68 is fixed so that the control channel can be received. Therefore, the wireless transmission circuit 66 and the like are always inactive at a time other than intermittent transmission in a system that constantly transmits a control signal or a system that transmits a control signal intermittently.
Only the synthesizer 55-1 is operating.

Now, a call request signal is transmitted from the mobile radio device 50 under the above conditions. The call request signal including the ID of the own mobile radio device 50 is created by the control unit 58 shown in FIG. 1B and sent to the radio transmission circuit 66. The radio transmission circuit 66 modulates the signal, amplifies the signal to an appropriate level, applies the signal from the transmission mixer 61 to the antenna, and sends the signal to the radio base station 30-1 and the like.

In the radio base station 30-1 or the like that has received this signal satisfactorily, the content of the received signal is inspected and the ID of its own radio base station 30-1 is checked.
It confirms that the call is from the mobile radio device 50 whose location registration has been completed and is stored in the identification storage unit 34, and sends a call response signal to the radio system controller 20. If your own wireless base station
If the mobile wireless device is not stored in the storage unit 34 of the wireless communication device 30-1, the mobile wireless device is stored at this point in time, and the
Sends a response signal to

In the radio system controller 20, the communication path is set with the radio base station having the best reception quality from the mobile radio device 50 obtained by the radio base station 30-1 or the like.
In this case, a communication channel that is unused at that time and is not likely to cause radio interference is investigated, and if there is, a response is made to the radio base station 30-1 that has requested the communication channel assignment. The radio base station 30-1 that has received the reply transmits the reply to the mobile radio device 50 using the downlink control channel.

On the other hand, the mobile radio device 50 receives this signal, checks the content of the signal, confirms that the channel is allocated to the mobile radio device 50, and changes the transmission / reception channel to the specified channel. Further, in the wireless system control device 20, the switch SW of the switch group 23 for setting the communication path is turned on.

At this time, a dial tone is heard on the telephone unit 59 of the mobile wireless device 50, and when the user performs a dial operation, the wireless base station 30, the wireless system control device 20, and the gateway exchange 19
, A dial pulse (PS signal) is sent.

Hereinafter, a communication (communication) path is set between the telephone network 10, the gateway exchange 19, the radio system controller 20, the radio base station 30-1, and the mobile radio device 50 on the called side.

The flow of the calling operation is described above with reference to FIGS. 5A and 5B. However, the radio base station 30 that communicates with the mobile radio 50
Shows only one station (30-1). The radio system controller 20 and the radio base station 30-1 have already started operation, and the mobile radio
50 has also begun operation, and has completed the location registration work described in FIGS. 4A and 4B. Handset is raised (off
Hook), and this off-control using the uplink control channel (CH).
The hook signal and the ID (identification number) of the mobile wireless device 50 are transmitted (S231, FIG. 5A).

In response to this, the radio base station 30-1 transmits the ID of the mobile radio 50.
Is detected, and it is confirmed that the ID is already stored in the ID identification storage unit 34 (S232).

Then, the wireless base station 30-1 adds the value of the reception quality received from the mobile wireless device 50 and the current idle channel number, and sends the call response signal using the transmission path (S233).

The radio network controller 20 receiving such a call response signal from the plurality of radio base stations 30 confirms the ID (identification signal) from each radio base station 30 and examines the value of the reception quality (S234). , Diversity transmission and reception, for example, radio base station 30-1 ~
30-n is selected, a free channel is confirmed, and a signal for designating a communication channel to be used is transmitted (S235). Here, channel CH1 is transmitted to radio base station 30-1. The radio base station 30-1 confirms the ID of the radio base station 30-1 instructed by the radio network controller 20, confirms that the designated communication channel (CH) is free, and The channel designation signal is transferred using the downlink control channel (S23
6). Upon receiving this channel designation signal, the mobile radio device 50 confirms that the designated channel is free, switches to the designated channel (S237), and sends a channel switching completion report using the downlink control channel. (S238).
The radio base station 30-1 that has received the switching completion report also performs channel switching and reports the completion (S239). In response to this, the radio network controller 20 confirming the completion of the channel switching is transmitted to the radio base station 30.
-1 and the mobile radio 50 ID and communication quality are stored in the ID identification storage unit.
The switch 23 is turned on, for example, SW1-1 under the control of the communication control unit 21 to connect the wireless base station 30-1 to the exchange 11 of the telephone network 10 (S241).

Then, a dial tone is transmitted from the gateway exchange 19 via the switch group 23 of the radio system controller 20 (S2).
42, Figure 5B).

This dial tone is transmitted from the radio base station 30-1 to the channel CH.
It is transferred by 1 (down) (S243), received by the mobile radio device 50, and it is confirmed that a call (communication) is set (S2).
44). The mobile radio 50 transmits the destination dial signal to the channel.
Sending is performed using CH1 (up) (S245), and the gateway exchange 19 operates to set a communication (communication) path to the destination of the telephone network 10 (S247). Thereafter, a call is made (S248).

When the call is completed, the handset is hooked on (S249), and the on-hook signal and the end signal are transmitted to the mobile radio 50.
Is transmitted using the channel CH1 (up) (S25).
0). Thereby, the wireless base station 30-1 confirms the end of the call (S25
1), the end of the call is transmitted to the radio system controller 20. Therefore, in the wireless system control device 20, the switch SW1-1 of the switch group 23 is turned off, and the call ends (S252).

Note that, in the above description, the wireless
Although the number of radio base stations 30 communicating with 50 is limited to one, this is not always necessary. That is, it is possible to communicate with a plurality of radio base stations 30 from the beginning of a call, as in the case of applying transmission / reception diversity described later. However, in this case, it is necessary to sufficiently consider the traffic state in the vicinity.

The transmission from the plurality of radio base stations 30 to the mobile radio device 50 may be performed at the same time. However, in this case,
Since the call signal is the same, there is no problem, and the mobile radio device 50 identifies which radio base station 30 was transmitted by making the occupied frequency bands different from each other as a control signal (see FIG. 2 (a)). It is necessary to make it.

(3) Incoming Call Operation The present invention has been described above with respect to the outgoing call from the mobile radio device 50. Hereinafter, the flow of the incoming call operation to the mobile radio device 50 will be described in the 6A.
This will be described with reference to FIG. 6 and FIG. 6B. Here, among many wireless base stations 30, 30-1 is shown as a representative. For example, the mobile radio 50 and the like existing near the radio base station 30-1 and the like are waiting on a control channel commonly used by all the radio base stations 30.

However, in a system having a relatively large small zone configuration, the control channels transmitted from the respective radio base stations 30 may be different, and in this case, the control channels for reception also differ between the respective radio base stations 30. . In such a system, the mobile radio device 50 is waiting on one of the downlink control channels. Communication with a plurality of radio base stations 30 involves the procedure of applying diversity described in (4).

In FIG. 1A, it is assumed that an incoming call signal addressed to the mobile wireless device 50 has arrived from the telephone network 10 via the gateway exchange 19 to the wireless system control device 20. In the ID identification storage unit 24 in the radio system controller 20, the incoming call signal is inspected, and when the ID of the called party is examined, the radio base station 30 (s) whose location is currently registered is found. I do. Then, the mobile radio device 50 simultaneously sends an incoming call signal to all the radio base stations 30 whose location is registered via the communication control unit 21 (S271, FIG. 6A).

Each radio base station 30 receiving this signal transmits the ID in its own station.
When the identification storage unit 34 (C) is searched to confirm that the ID of the mobile radio device 50 is stored therein, a signal for an incoming call and a call channel designation request is sent to the mobile radio device 50 using the downlink control channel. Is transmitted with the ID of the wireless base station 30-1 added.
The mobile radio 50 is called at substantially the same time by a similar operation to the other radio base stations 30 (S272).

On the other hand, when the incoming call signal is received by the mobile radio device 50 waiting on the control channel, the content of the received signal is searched, and when it is confirmed that the incoming call signal is addressed to the own mobile radio device 50 (S273),
An incoming call confirmation signal is transmitted to the radio base station using the uplink control channel.
30-1, 30-2,..., 30-n (S274). Mobile radio 5
Each radio base station 30-1 receiving the uplink control channel from 0
In steps 30 to 30-n, the quality of the received signal is checked, the ID of the mobile radio device 50 that transmitted the signal is confirmed (S275), and an incoming call response signal is transmitted to the radio network controller 20 (S276).

The call response signal to the radio system controller 20 includes the ID of the mobile radio device 50. Therefore, upon receiving this call response signal, the radio system controller 20 checks whether or not the ID of the mobile radio device 50 has already been stored in the ID identification storage unit 24. It is registered in the ID identification storage unit 24 together with the quality inspection data of the base station 30-1 (S27
7) A response confirmation signal including a signal designating a communication channel together with the stored ID and the like is transmitted to the radio base station 30-1 and the like (S278).

Upon receiving this response confirmation signal, the wireless base station 30-1 confirms that the ID of the mobile wireless device 50 has been correctly registered (S27
9), check whether the channel specified by the radio network controller 20 is vacant or not, and examine whether switching is possible (S280,
FIG. 6B), and transmits the resulting channel designation signal to the mobile radio device 50 through the downlink control channel (S281).

The mobile radio receiving this channel designation signal (S282)
In 50, when it is confirmed that the designated channel is a free channel (S283), the channel is switched to that channel and a channel switching completion report is transmitted using the uplink control channel (S284).

Confirmed that the channel was switched to an empty channel (S285)
The radio base station 30-1 switches to this channel and sends a channel switching completion signal to the radio network controller 20 (S286).

Upon receiving the channel switching completion signal, the radio system controller 20 operates the communication control unit 21 to set a communication path to the telephone network 10 via the gateway switch 19, and operates the switch group 23, for example, SW1-1. Turn on the radio base station 30-1 and telephone network 1
Connect with 0 (S287). Then, a calling signal is transmitted from the telephone network 10 via the gateway exchange 19 and the radio system controller 20 (S288, FIG. 6C), and this is confirmed by the radio base station 30-1 (S289). Therefore, a ringing bell signal is transmitted on the set communication channel CH1, and a ringing tone is generated by the mobile radio device 50 (S291).

When the handset of the mobile radio device 50 is picked up by the ringing tone (off-hook) (S292), an off-hook signal is sent out on the channel CH1 and transferred by the radio base station 30-1 (S293). Received by the radio system controller 20 (S29
4), a call is started between the telephone network 10 and the mobile radio device 50 (S295).

When the call is finished, the handset is taken down, and the on-hook signal and the end signal are transmitted by the radio base station 30-1 via channel CH1.
(S296), and the wireless base station 30-1 confirming the end of the call transfers this signal (S297). Receiving the on-hook signal and the end signal, the radio system controller 20 activates the communication control unit 21 to turn off SW1-1 of the switch group 23 and end the call (S298).

In the above description, even in a system in which a control transceiver installed in the radio base station 30-1 is diverted for a communication channel, a method for temporally and repeatedly switching transmission and reception channels as described in the configuration of the mobile radio. By the third already
It is possible to communicate with a newly-arrived mobile radio using the control channel even while communicating with the mobile radio (see FIG. 1D).

In the systems exemplified in (2) outgoing call operation and (3) incoming call operation described above, a dedicated radio channel for control and a dedicated radio channel for speech are clearly separated as radio channels. Was. However, in some real systems, this distinction is not clear. In such a system, it is possible to perform an equivalent operation by regarding a specific communication channel as the control channel described above.

(4) Application of Diversity When Traffic Is Closed By the call origination / reception operation described in the paragraphs (2) and (3), the general telephone A in the telephone network 10 and the mobile radio 50 (or system) Between two mobile radios in
It is assumed that communication has started. In this case, it is assumed that the mobile radio device 50 communicates with one radio base station 30 and that the communication traffic state in the system, that is, the traffic state at least in the vicinity of the mobile radio device 50 is not busy hour, that is, the busiest time ( The same can be applied to the case where the number of wireless base stations 30 is two or more.)

Then, the mobile radio device 50 starts preparations for performing diversity transmission and reception. Therefore, the mobile radio 50 shown in FIG.
The control unit 58 sends an operation start command signal to each of the transmission switching controller 67C and the reception switching controller 65C, and also outputs the synthesizers 55-1 and 56-1 in addition to the currently operating synthesizers 55-1 and 56-1. Control channel CH for n and 56-n
Request frequency oscillation so that 50 can transmit and receive. At the same time, the control unit 58 starts transmitting a control signal to the wireless transmission circuit 66. This control signal includes the ID of the mobile wireless device 50, the type of communication (type of voice, data, etc.), the channel number currently in use, and transmits to the nearby wireless base station 30 that has received the signal and is not currently communicating. On the other hand, it requests the start of diversity transmission / reception operation. However, the conditions for the above radio base station 30 are as follows if the radio base station 30 is in the state shown in FIG. 1D or FIG.
If the configuration shown in Figure 1F is made,
This condition can be alleviated because a new call can be made with the mobile wireless device even during communication with the third party mobile wireless device.

With the above operation, the output of the transmission mixer 61 of the mobile radio device 50 can be transmitted by the control channel CH50 in addition to the currently communicating channel CH1, while the receiving mixer 63 is currently transmitting the communication channel CH1. , The control channel can also be received. This is described in detail in the operation (5) of the channel switching during communication.

The control signal transmitted from the mobile wireless device 50 is received by a plurality of nearest wireless base stations 30-2, 30-3, ..., 30-n that are not currently communicating. Then, one of them, the radio base station 30-2
As a result, the quality of the received signal and the content of the signal are examined, and as a result, the quality of the signal received from the mobile wireless device 50 is equal to or higher than a certain value, and the communication quality does not immediately decrease. If it is determined that there is not any, the control signal including the ID of the own radio base station 30-2, the usable radio channel number (for example, CH2), etc., is transmitted to the mobile radio device 50 that has transmitted. Then, a signal indicating that diversity transmission / reception is possible is transmitted.

This signal is received by the wireless receiving circuit 68 of the mobile wireless device 50 and transmitted to the control unit 58. The control unit 58 receiving this, as a result of examining the signal transmitted from the wireless base station 30-2, determines that it is appropriate to perform diversity transmission and reception, and for the synthesizers 55-2 and 56-2, Channel CH
In order to start communication with the radio base station 30-2 in 2, a request for generation of a local oscillation frequency is required. Further, the communication control unit 21 in the radio system control device 20 operates the switch group 23 to the radio base station 30-2 to transmit the communication signal currently being communicated to the radio base station 30-2.
Requests parallel transmission to -2.

Upon receiving this request, the radio system controller 20
In response to the request of 30-2, the transmission of a voice signal, that is, a voice signal from a general telephone, is started not only to the radio base station 30-1 but also to the radio base station 30-2 with the same signal.

The radio base station 30-2 that has received this audio signal adds the ID of the radio base station 30-2 to the mobile radio 50 and adds the radio channel.
Transmit on CH2. On the other hand, the mobile radio 50
Since H2 can be received, after checking the output of the wireless receiving circuit 68 that has received this signal, if the quality is good, the voice signal is sent to the telephone unit 59, and the control signal is sent to the control unit 58.
Is transmitted to

By performing the above operation, the mobile radio device 50 enters a diversity transmission / reception state with the radio base stations 30-1 and 30-2.

The diversity transmission / reception execution request signal transmitted from the mobile radio device 50 to the radio base station 30 in the vicinity thereof is transmitted to the radio stations 30-3, 30-4, ..., 30 other than the radio base station 30-2. -
n is also received in the same manner, and among these, the radio base station suitable for the condition should have transmitted the same response signal as in 30-1 to the mobile radio device 50.

Therefore, the control unit 58 of the mobile radio device 50 or the radio system control device 20 requires the above-described radio base station to perform diversity transmission / reception with a larger number of radio base stations.
When exactly the same operation is performed as when diversity transmission / reception with 30-2 is performed and all operations work normally, diversity transmission / reception with radio base station 30-3 is started, for example.

Hereinafter, by the same operation as described above, the radio base station 30-3, 3 which is closest to the mobile radio 50 and is not currently communicating, and whose communication quality satisfies a certain criterion or more required for the system.
Diversity transmission / reception is similarly started for 0-4,..., 30-n. The multiplicity of diversity is the number of radio base stations 30 with which communication is possible or the multiplicity of simultaneous transmission and reception provided in the mobile radio device 50, that is, 1B
In the case of the figure, it depends on the number n of the synthesizers 55-1 to 55-n or 56-1 to 56-n.

In the above description, it is assumed that the call traffic in the system is not crowded, but the traffic state is measured at each radio base station 30, and when the traffic is sequentially congested, regarding the multiplicity of diversity, Restrictions are sequentially added, and at the peak, the state shifts to a multiplicity of 1, that is, a state without diversity. However, by providing discrimination in the reduction of multiplicity depending on the type of communication being performed (voice, data, facsimile, etc.), broadband communication is less likely to be limited by multiplicity,
The present invention has features such as enabling systematic processing and ensuring good communication regardless of the type of communication.

(5) Description and Rationale of Channel Switching During Call and Diversity Effect n-1 radio base stations 30 and one mobile radio 50
During communication using n-1 channels, if the communication quality of a certain channel becomes lower than or equal to a certain value, if there is no current communication satisfying the certain communication quality, Prior to switching to another one channel (new channel) for communication with one of the wireless base stations 30, the switching receiving means and the switching transmitting means are switched at a speed which does not affect the communication signal. The old channel and the new channel other than the n-2 channels being continuously transmitted and received are transmitted and received temporarily in parallel, and during that time, the quality of the new channel is checked to confirm that the quality is above a certain level. Then, the operation for channel switching ends, and communication is performed using n-1 wireless channels including the new channel.
As a result, instantaneous interruption of communication due to channel switching does not occur. In addition, a transmission / reception diversity effect can be obtained including the case where channel switching is not performed.

1A to 1I show a system configuration for explaining an example of this operation. Hereinafter, description will be made with reference to these figures.

The mobile radio 50 (B, C, D) (hereinafter simply abbreviated as 50)
, 55- (n-1), a radio receiving circuit 68, and a radio transmitting circuit 66, the radio base stations 30-1, 30-2,.
..., 30- (n-1) and the communication channels CH1, CH2, ..., CH (n-
Assume that communication is being performed using 1). It is assumed that the mobile radio device 50 moves away from the radio base station 30-1 and approaches the radio base station 30-n. Then, as the relative distance between the mobile radio device 50 and the radio base station 30-1 increases, the communication quality starts to deteriorate, so that the S / N monitoring unit 22 of the radio system controller 20 detects the level (level L _1). It is detected that it has dropped below). Incidentally, it is set to exceed a value even the level L ₁ line is required.

The radio system controller 20 is connected to all the radio base stations 30 in the vicinity.
Is requested to measure the quality of the transmission signal of the mobile radio device 50. In response to this request, each wireless base station 30 that is not currently communicating with the mobile wireless device 50 reports the measured value to the wireless system control device 20.

The S / N monitoring unit 22 of the radio network controller 20 that has obtained the information such as the C / N value transmitted from each radio base station 30-n and the like compares the plurality of pieces of information and finds that the radio base station 30-n The measurement result of n has the best value and the quality standard level L ₂ or higher, where L ₂ >
When it was confirmed that satisfies the L _1, the mobile radio device
50 judges that it has approached the vicinity of the communication zone (zone n) of the radio base station 30-n, and decides to perform channel switching.

Then, as a result of investigating a vacant communication channel in the zone n, as reported from the radio base station 30-n, the channel
Know that CHn is available. Therefore, using the communication channel CH1 (or any of CH2,..., CHn-1 or the control channel, which will be referred to as CH1 in the following description) during the current communication, the communication signal is transmitted to the mobile radio device 50 by the control signal. Instructs to prepare for sending and receiving on CHn.

At the same time, the channel CH is transmitted to the radio base station 30-n.
Instruct n to send and receive. After issuing these instructions, the wireless system controller 20 also turns on SW1-n of the switch group 23, and the wireless base station 30-n starts transmitting a voice signal using the communication channel n. In this case, it is needless to say that the modulation depth and the signal phase of the modulator of the radio base station are also substantially the same as those of the other radio base stations 30-2, 30-3,..., 30-n.

To realize the transmission of this control signal, specifically,
When the control signal is an analog signal, as shown in FIG.
Outside low frequency f _D0 (for example, about 100 Hz) or high frequency f _D1 , f _D2 , f _D3 … f _D8 (for example, at intervals of 3.8 KHz to 0.1 KHz)
Eight waves up to 4.5 KHz, where n = 8) are used.

When there are many items to control, that is, control data,
May be further increased wavenumber frequency f _D0 ~f _D8 for control, it is also possible to take the subcarrier format. In this case, for example, or apply frequency modulation to the 1-wave or a plurality of waves of f _D0 ~f _D8, or by or multiplied by amplitude modulation, it is also possible to transmit more control data.

When a digital data signal is used as the control signal, it is also possible to digitally encode the voice signal and transmit the signals in a time-division multiplexed manner, as shown in FIG. As shown.

FIG. 3 shows a timing chart before and after the channel switching of the present system shown in FIGS. 1A, 1B and 1C.

In the third diagram describing the channel switching operation, the wireless system controller that the quality of the channel CH1 is used between the mobile radio 50 and base station 30-1 has dropped to the level L ₁ or less 20 The S / N monitoring unit 22 of the mobile radio device 50 using the channel CH1 to detect and detect the channel CHn so as to start preparations for enabling reception of the transmission radio waves from the radio base station 30-n in parallel. To instruct.

Therefore, the control unit 58 of the mobile wireless device 50 uses the synthesizers 55-1, 55-2,..., 55- (n-1) to transmit the transmission wave of the radio base station 30-1 by the channel CH1 and the channel From the state of receiving the transmission wave of the wireless base station 30-2 by CH2,..., The transmission wave of the wireless base station 30- (n-1) by channel CHn-1, the synthesizer 55-n is also operated. Wireless base station
A frequency is generated in the synthesizer 55-n so that the transmission wave of the channel CHn transmitted from 30-n can be received.

Thus, when the communication with the radio base station 30-1 is about to be stopped due to the deterioration of the quality of the channel CH1 transmitted from the radio base station 30-1, the radio base station 30-n and the channel
Communication by CHn starts. That is, the mobile radio 50
Then, the repetitive switching of the changeover switch 64-1 receiving the changeover drive input signal from the reception changeover controller 65C is continued. At the same time, synthesizers 56-1,56-2, ..., 56-
By operating (n-1) and transmitting to the radio base stations 30-1 to 30- (n-1) using the channels CH1 to CHn-1, the synthesizer 55-n is also operated. , Wireless base station 30
-n is shifted to a state where transmission can be performed by the channel CHn. The synthesizer used for this transmission
The outputs of 56-1, 56-2,..., 56-n are repeatedly switched by a changeover switch 64-2 with a switching drive input signal from a transmission switching controller 67C.

Channels CH1 and CH2, ......, the switching transceiver period and CHn are transmitted and received in parallel, the radio controller 20 to check that the quality of the check and the channel of the channel CHn is a certain level L ₂ or Until the channel CH
1 is released, and the radio base stations 30-2, 30-3,…, 30-n and mobile radio
Communication with 50 is continued without interruption by only the channels CH2, CH3,..., CHn.

Changeover switches 64-1 and 64-2 during this changeover transmission / reception period
Switching frequency f ₁ of is determined to 2n times like the highest frequency contained in the example signal. Hereinafter, this will be described in detail.

An optimum value is determined for the switching frequency in consideration of the following conditions.

1) Modulation format of a signal to be transmitted 2) Signal frequency band to be transmitted 3) Control frequency band to be transmitted 4) Band characteristics of a transmission / reception unit, especially a band characteristic of a high frequency filter installed at an antenna input terminal 5) Waveform characteristics of switching controller 6) Response characteristics of frequency synthesizer 7) Carrier frequency and number of channels used in system 8) Radio wave propagation characteristics of transmission line 9) Radio system controller 20 via radio base station 30-1 The transmission delay time difference due to the difference between the signal transmission path to the mobile radio 50 and the signal transmission path from the radio system controller 20 to the mobile radio 50 via the radio base station 30-2. , 2) is an audio signal 0.
When the control signal out of the band shown in FIG. 2 (a) is used as 3 to 3.0 KHz, 3), it is 0.3 KHz or less (f _D0 ) or 3.8 to 3.0 KHz.
To become _{4.5KHz (f D1, f D2 ......} f D8). 4)
The response characteristics of the synthesizer in 6) are good at the passband bandwidth of 16KHz (or 8KHz) and 5),
The selection should be made in consideration of the good output waveform, and it is desired that the synthesizer to be used has a quick and rapid response characteristic by the input of the switching controller in 5).

7) to 9) are items to be considered in terms of system design. In the car telephone system described as the embodiment of the present invention, since 7) is 900 MHz and 600 channels, the used frequency bandwidth is 15 MHz (or , 15 MHz for 1200 channels),
8) is known in many documents, and 9) is about 0.03 ms.

Considering the above comprehensively, for example, in the mobile telephone system, the switching frequency of the selector switch 64-2 of the mobile radio device 50 is selected to be about 20 × n MHz.

Hereinafter, the case of reception will be described. When the audio signal and the control signal are digitized as shown in FIG. 2 (b), it is appropriate to use a higher frequency as the switching frequency, and to use a value of about n × 20 KHz to 30 KHz. Good.

Also, the channels CH1,2, CH2 seen from the input section of the reception mixer 63
3, ..., n-1, the carrier frequency of _{n ω 1, ω 2, ...} , ω n-1,
ω _n , and the synthesizers 55-1,55-2, ..., 55- (n-1),
Let the output frequencies of 55-n be ω _L1 , ω _L2 ω _Ln-1 , ω _Ln
, 30− (n−1), 30−
Each carrier frequency at the output of intermediate frequency amplifier included in the received mixer 63 from _{n, Ω 1 = ω 1 -ω} L1 (1 1) Ω 2 = ω 2 -ω L2 (1 2) ...... Ω n ₋₁ = ω _n−1 −ω _Ln−1 (1 _n−1 ) Ω _n = ω _n −ω _Ln (1 _n ) That is, the operation of the changeover switch 64-1 causes the reception unit 53 to output Ω as an intermediate frequency. _{1 = ω 1 -ω L1 Ω 2} = ω 2 -ω L2 ...... Ω n-1 = the signal wave is successively with _{ω n-1 -ω Ln-1} Ω n = ω n -ω Ln carrier frequency, such as Will be entered. (1 ₁ ) and (1 ₂ )..., (1 _n−1 ) have a relationship of Ω ₁ ≒ Ω ₂ ≒... ≒ Ω _n-1 = Ω _n (2). Such a signal is amplified by the receiving unit and then demodulated by the demodulation circuit. The n intermediate frequencies ω ₁ −ω _L1 ω ₂ −ω _L2 ... Ω _n−1 −ω _Ln−1 ω _n −ω _If there is a frequency difference between _Ln and the demodulated output signal,
There are cases where distortion noise occurs and cases where distortion noise does not occur. That is, in the case of frequency modulation or phase modulation, no distortion noise occurs when there is no frequency difference, but when there is a frequency difference, it occurs when the frequency difference (beat frequency) contains the same component as the signal frequency. If not included, it does not occur.

On the other hand, in the case of amplitude modulation, distortion noise does not occur even if there is a frequency difference. However, even in the case of amplitude modulation, if the intermediate frequency amplifier or the like has non-linear characteristics, non-linear distortion due to higher harmonics occurs. Therefore, it is necessary to use an amplifier having good linearity.

Even if the local oscillation frequencies for CH1, CH2,..., CHn _-1 and CHn are cyclically applied to the input of the reception mixer 63 of the mobile radio device 50 as described above and received, there is no abnormality in the communication. It is theoretically explained that the transition from CH1 to channel CHn can be executed without any interruption (no noise is mixed) and that there is a reception diversity effect.

 First, a case where an angle-modulated wave is used will be described.

The data or audio signal (for signals in analog or digital form) can be expressed as:

The control signal existing outside the band is Where a _i is the magnitude of the amplitude, ω _i is the angular frequency of the signal,
θ _i represents the phase when t = 0. m and n represent positive integers.

Next, the case of frequency modulation will be described, but the present invention is similarly applied to phase modulation. Equation (3) or (3)
When the carrier is frequency-modulated by the equations (4) and (4), the modulated wave obtained is: I = I ₀ sin∫ (ω + μ (t)) dt = I ₀ sin (ωt + s (t)) (5) or I = I ₀ sin∫ (ω + μ (t) + μ _c (t)) dt = I ₀ sin (ωt + s (t) + s _c (t)) (5 ′) where m _i = a _i / ω _i (i = 1,2,3... n) For simplicity, θ _i = 0 (i = 1,2,3... n).
As a result, s (t) + s _c (t) represents a general form of transmission signal.

By the way, when the equation (5) or (5 ') is used, the signals transmitted from the radio base stations 30-1, 30-2, ..., 30- (n-1), 30-n are transmitted to the mobile radio 50. , And is mixed with the local oscillator output (in the case of FIG. 1B, synthesizers 55-1, 55-2,..., 55- (n-1), 55-n). And the input of the receiving unit 53 can be represented by the following equation using the same symbols as the equations (1) and (2).
(However, the changeover switch 64-1 is in a stopped state.)

_{I i = I 0i sin (Ω} i t + s (t) + s ci (t)) (6) (i = 1,2, ..., n) Next, the changeover switch 64-1 starts the switching operation. The mobile radio 50 receives the voice signal s (t) and the control signal s _ci (t) from the radio base station 30-i (i = 1, 2,..., N). As an input of part 53, Here, p is the switching angular frequency, m is a positive odd number, and the switching times for n input waves are equally spaced. When the right side of the equation (7) is transformed, the following equation is obtained.

I = (I ₀₁ / n) [sin {Ω ₁ t + U ₁ (t)} + (π / n) sin (π / n) × [cos ｛(Ω ₁₋ p) t + U ₁ (t)｝ − cos ｛ (Ω ₁ + p) t + U ₁ (t)｝] + (3π / n) sin (3π / n) × [cos ｛(Ω ₁ −3p) t + U ₁ (t)｝ −cos ｛(Ω ₁ + 3p) t + U ₁ (t)}] + (5π / n) sin (5π / n) × [cos {(Ω 1 -5p) t + U 1 (t)} -cos {(Ω 1 + 5p) t + U 1 (t)}] + ... ...] + (I ₀₂ / n) [sin {Ω ₂ t + U ₂ (t)} + (π / n) sin (π / n) × [cos ｛(Ω ₂ −p) t + U ₂ (t)} −cos _{{(Ω 2 + p) t} + U 2 (t)}] + (3π / n) sin (3π / n) × [cos {(Ω 2 -3p) t + U 2 (t)} -cos {(Ω 2 + 3p) t + U _{2 (t)}] + (} 5π / n) sin (5π / n) × [cos {(Ω 2 -5p) t + U 2 (t)} -cos {(Ω 2 + 5p) t + U 2 (t)}] + ……] + _……… + (I _0n / n) [sin _{{Ω n t + U n (} t)} + (π / n) sin (π / n) × [cos {(Ω n -p) t + U n (t)} -cos {(Ω n + p) t + U n (t) }] + (3π / n) sin (3π / n) × [cos {(Ω n -3p) t + U n (t)} -cos {(Ω n + 3p) t + U n (t)}] + (5π / n ) sin (5π / n) × [cos {(Ω n -5p) t + U n (t)} -cos {(Ω n + 5p) t + U n (t)}] + ......] (8) However, U _i ( t) = s (t) + s _ci (t) (i = 1, 2,..., n) Here, as seen from the equation (8), many carrier waves are synthesized. If the signal is demodulated after amplification, distortion noise due to cross modulation (interference interference) may generally occur.

Further, the amplitudes I ₀₁ , I ₀₂ ,
…, I _0n are not necessarily the same amplitude, but when the time occupancy of switching is equal (when the duty is 100 / n%)
, I ₀₂ , I ₀₃ ,..., I _0n are usually larger because 30-2 is closer than the radio base station 30-1. I ₀₁ , I
_If the magnitudes such as ₀₂ differ, cross-modulation may occur. There are two types of cross-modulation generation factors, one caused by the combination of many carrier waves shown in the above equation (8) and the other caused by the difference of I ₀₁ , I _{02, and the} like.

By the way, with respect to the intermodulation in the case of combining a large number of carrier waves shown in Expression (8), the distortion noise can be removed by the following method.

That is, there is a method of increasing the switching speed (period) of the changeover switch 64-1 to drive it out of the bandpass characteristics of the intermediate frequency amplifier. However, as already mentioned, in many cases where the switching frequency is determined to be more than 2n times the highest frequency of the signal, it will not be necessary to increase it further. By increasing the speed, m = 1,3,5 on the right side of equation (7) ...
Can be ignored in the intermediate frequency amplifying stage as can be seen from the equation (8), and the equation (8) can be expressed as follows.

_{I = I 01 sin (Ω 1} t + s (t) + s c1 (t)) + I 02 sin (Ω 2 t + s (t) + s c2 (t)) + ...... + I 0n sin (Ω n t + s (t) + s cn ( t)) (9) In the equation (9), Ω ₁ = Ω ₂ =... Ω _n-1 = Ω _n = Ω (10) s _c2 (t) =... s _cn-1 (t) = s _cn It is assumed that (t) = 0 (11). Actually, equation (10) is technically possible by means described later, and equation (11) is obtained from the radio base station 30-1 as described above (or only from the radio base station 30-n in the latter half of channel switching). If only the control signal to be transmitted is used, equation (11) holds. Then, equation (9) can be modified as follows.

I = I ₀₁ sin (Ωt + s (t) + s _c1 (t)) + (I ₀₂ + I ₀₃ +... + I _0n ) × sin (Ωt + s (t)) (12) When the equation (12) is transformed, the following equation is obtained. become.

^{_{I = (I 01 2 + I}} n 2 + 2I 01 I n × cos s c (t)) 1/2 × sin (Ωt + s (t) + β (t)) (13) β (t) = tan -1 [sin s _{c (t) × {(I} 01 / I n) + cos s c (t)} -1] (13 ') I n = I 02 + I 03 + ...... + I 0n (13 ") (13), (13' ) because it is _{I 01 << I n (14)} s c (t) << 1 (14 ') (13) formula is as follows approximately the equation.

_{I = I n sin (Ωt +} s (t) + s c (t)) (15) (15) With regard to formula, which is a switching receive diversity scheme with antenna input of n branches, after switching the received signals, it is As a result of performing so-called straight line synthesis,
This indicates that the synthesis was performed using an input signal having a high input electric field, ignoring _I01 having a low input electric field. Therefore, it has been clarified that the present invention has a reception diversity effect.

From the equation (14), the output of the frequency discriminating circuit (the output of the wireless receiving circuit 68) is expressed by the following equation.

E = d / dt {s ( t) + s c (t)} = μ (t) + μ c (t) (16) where, mu (t) and mu _c (t), respectively (3) and This is shown in equation (4). Expression (14) is always satisfied in the ordinary mobile communication system, and is not particularly limited. It applies a deep modulation to the main audio signal compared to the control signal, and a shallow modulation to the control signal. In addition, the depth of the modulation applied to the voice has recently been reduced to 3.5 radians (1 KHz) with an equivalent tone (1 KHz) signal. 25K
In the case of the Hz carrier wave interval, and in the case of the carrier wave interval of 12.5 KHz, it is also as shallow as 1.75 radians).

From the above, it has been clarified that the equations (10) and (14) are sufficient conditions for the distortion-free condition in the case of frequency modulation.
Hereinafter, technical conditions for satisfying the expression (10) will be described.

To do this technically, the radio base stations 30-1, 30-2,
, 30-n is achieved by increasing the frequency stability of the reference crystal oscillator that determines the stability of the carrier frequency of the transmission units 31-1, 31-2,..., 31-n. For example, in an example of a car phone system to be described later, the stability of a reference crystal oscillator installed in a base station is currently about 0.5 to 1 ppm (0.5 to 1 × 10 ⁻⁶ ). × 10 ^-6 × 900MHz = 900Hz
It is. In this case, noise is mixed in the signal band of the voice.

However, if 0.01 ppm is made possible by the advancement of technology, 1 × 10 ⁻⁸ × 900 MHz = 9 Hz, and even if there is a harmonic of noise, there is little possibility that the large energy is mixed into the signal band. Become. Alternatively, in a wireless system using a carrier frequency of 9 MHz, a carrier fluctuation of 1 ppm does not cause noise contamination even in the current technology.

The case where the mobile radio device 50 receives the signal has been described above. The case where the mobile radio device 50 transmits the signal will be described below.

In FIG. 1B, the radio signal switched by the changeover switch 64-2 is, for example, sequentially switched to the radio channels CH1, CH2,..., CHn, but the reception side is the radio base station 30-1 (CH1),
30-2 (CH2),... Or the radio base station 30-n (CHn) are separately received, and there is no intermodulation problem when mixed as in the case of reception at the mobile radio device 50 side. is there. However, as is evident from equation (8), since there is a component of the carrier angular frequency (Ω ± np) as a sideband, these components are emitted into space and used for communication with other channels or other systems. It is necessary to provide a band-pass filter at the transmission output unit so as not to cause interference and to perform filtering.

For this purpose, it is necessary to spread the equation (Ω ± np) outside the frequency of all channels transmitted by the mobile radio device 50 as the switching frequency, and the car telephone system shown in FIGS. 1A and 1B used in the example is used. Then, it is necessary to set p / (2π)> 15 × nMHz.

This will be described below using mathematical expressions. However, the characters used in the formula are the same as described above unless otherwise specified. For example, the transmission signal appearing at the output of the transmission mixer 61 in FIG. 1H is represented by the following equation.

Here, p is the switching angular frequency, m is a positive odd number, and the switching times for n input waves are equally spaced. When equation (13) is transformed, an equation of the same form as equation (8) is obtained. With respect to the obtained equation, the following equation is obtained as an output signal when the obtained signal passes through a bandpass filter having the operation as described above.

I = I ₀ sin ｛Ω ₁ t + s (t) + s _c (t)｝ + I ₀ sin ｛Ω ₂ t + s (t) + s _c (t)｝ +... + I ₀ sin ｛Ω _n t + s (t) + s _c (t)｝ (16) In the above equation, the first term on the right side is for the radio base station 30-1,
The term is for 30-2, and the i-th term is for 30-i, and each signal has the same formula as that in the case of transmission of ordinary frequency modulation.

The uplink signal of channel CH1 is received by radio base station 30-1, the uplink signal of channel CH2 is received by channel 30-2, and the uplink signal of channel CHn is received by channel radio 30-n. These received signals are demodulated and transmitted to necessary devices such as the radio system controller 20.
Alternatively, when the radio base station 30-1 has the configuration shown in FIGS. 1E and 1F, the uplink signal of the channel CH1 is the same as the transceiver 90-1 of the radio base station 30-1, and the uplink signal of the channel CH2 is the same. 30-1
Transmitter / receiver 90-2, and in the following order the uplink signal of channel CHn is 30
After being respectively received and demodulated by the -1 transceiver 90-n, they may be mixed and transmitted to necessary devices such as the radio system controller 20.

As is apparent from the above description, the use of the multiplex transmission method and apparatus of the present invention makes it possible to obtain a signal diversity effect in the receiving unit.

In the radio system controller 20, the radio base stations 30-1, 30-2,.
Of the n signals from n, the audio signals are mixed with the signals from the radio base stations 30-1, 30-2, ..., 30-n. In mixing, signals from the radio base stations 30-2, 30-3,..., 30-n have better transmission quality than 30-1, so they may be mixed as they are, or may be proportional to S / N. The output may be mixed. That is, the reception diversity effect is obtained.

The transmission / reception diversity effect of the present invention has been described above, and a method for increasing the effect will be described in detail below.

First, regarding reception diversity, in the sequential switching method described above, each of the synthesizers 55-1 and 55-
2, ..., 55-n connection durations (duty times) are assumed to be equal. However, this is not always necessary, and the diversity effect is increased by connecting to a radio channel having a good S / N reception input for a relatively long time. To this end, a part of the receiving unit is synchronized with the changeover switch 64-1 to detect the signal-to-noise ratio at that time, and transmits this to the control unit 58, thereby changing the frequency of the output of the reception switching controller 65C. Thereby, the above-mentioned object can be achieved. This is also possible with the configuration of FIG. 1B, but for the purpose of
The configuration shown in FIG.

1B is different from FIG. 1B in that a C / N measurement receiving unit 52, a receiving mixer 73, and a changeover switch 64-3 are installed separately from the radio reception circuit 68, and the control of the changeover switch 64-3 is not performed. This is to be performed by the control unit 58B. The first below
The operation of the G diagram will be described.

In the figure, a reception mixer 73 is provided at a preceding stage to operate the C / N measurement receiving unit 52. A part of the reception signal received by the mobile radio device 50B is added to the reception mixer 73. As the local oscillation frequency to the reception mixer 73,
The output from the changeover switch 64-3 is added. However, the changeover switch 64-3 does not need to be switched at high speed unlike the other changeover switches 64-1 and 64-2, and a low speed of, for example, about 10 Hz is sufficient. Then, when the changeover switch 64-3 is at the position where the output of the synthesizer 55-1 is turned on, the C / N value of the channel CH1 measured by the C / N measurement receiving unit 52 is transmitted to the control unit 58B. Next, the changeover switch 64-3 is the synthesizer 55-2
Measure the C / N of channel CH2 when it is in the position to turn on the output of. Hereinafter, when the output of the synthesizer 55-n is sequentially turned on, the C / N of the channel CHn is measured and transmitted to the control unit 58B. The control unit 58B uses these values to control the reception switching controller 65C and the transmission switching controller 67C.
Are controlled, for example, to operate at speeds inversely proportional to C / N, respectively.

In order to enable the above-described operation, a slight change is required in the method of transmitting a signal from each of the above-described radio base stations 30, and this will be described below.

By the way, if the above formula (9) is re-posted, In equation (9), the control signal transmitted from each wireless base station 30 includes the ID of the wireless base station 30, and this ID is necessary to change the duty of the above-described changeover switch. As in the aforementioned equation (11), s _ci = 0 (i = 1, 2,..., N) cannot be set. So in this case (10)
Although the equation holds, the equation corresponding to equation (12) is as follows.

Since each s _ci (t) in Expression (17) is sufficiently smaller than 1 (however, the constant term is omitted), the following expression is approximately obtained as an expression corresponding to Expression (15).

In order to demodulate the signal represented by Expression (18) and extract the control signal transmitted from each wireless base station 30, S _ci (t)
Can be filtered by a filter by making the frequency components of the signals included in the filter different from each other.

Therefore, by measuring the C / N of each wireless channel and adding the ID of the wireless base station 30 that has transmitted the signal to the control unit 58B, the control unit 58B controls each wireless channel, that is, each wireless base station. The duty time for receiving (or transmitting) for each 30 can be determined in relation to the C / N value.

In order to achieve the above effects with the configuration of FIG. 1B, the control signal _sc1 (t) transmitted from each of the radio base stations 30-1, 30-2,..., 30-n to the receiving unit 53 of FIG. ), s _c2 (t)..., s _cn (t) are provided, and each of them has a communication quality monitoring means such as measuring a signal-to-noise ratio. Good. Then, the measurement value is reported to the control unit 58, and the changeover switch 64-1 may be operated with a switching duty according to the signal-to-noise ratio.

By operating the receiving unit 53 of the mobile radio device 50 as described in detail above, it is possible to increase the transmission / reception diversity effect.

Next, a method for further increasing the reception diversity effect will be described. FIG. 1H shows the mobile radio 50 in this case.
3 shows a configuration example of C.

In FIG. 1H, an input radio wave (input signal) to the mobile radio device 50C is divided into n + 1 equal parts at an antenna input unit, and the radio reception circuits 68-1, 68-2,..., 68-n and the interference detector 62, respectively.
To arrive. In each of the wireless receiving circuits 68-1 to 68-n, the receiving mixers 63-1, 63-2,..., 63-n and the receiving units 53-1, 53-2,.
, and the local oscillation frequencies from the synthesizers 55-1 to 55-n are input to the reception mixers 53-1 to 53-n, respectively. Accordingly, in the configuration of FIG. 1H, there is no reception changeover switch 64-1 and each radio channel CH1, CH2,
.., It is possible to receive and demodulate the CHn signal.

Also, the output signals of these receiving units 53-1 to 53-n are partially sent to the control unit 58C, and the communication quality monitoring units 57-1, 57-2,
, 57-n to monitor the communication quality of each wireless channel, report the result to the control unit 58C, and furthermore, to the receiving unit 53-n.
The outputs 1 to 53-n are applied to a signal mixing circuit 62, subjected to the same processing as that of a normal diversity receiver (in this case, synthesis after detection), and sent to a telephone unit 59.

By adopting the circuit configuration as shown in FIG. 1H, a large diversity effect can be obtained.

As is clear from the above description, the operation of the present invention is to measure the transmission frequency of the mobile radio device 50 by the radio base station 30 to predict the frequency shift after the switching to the new communication channel, and It is characterized in that by setting and using a transmission channel of a radio base station that communicates after the channel switching at an appropriate frequency, noise due to communication interruption or intermodulation occurring due to the channel switching is removed.

Next, how to use a control signal which plays an important role in channel switching during a call according to the present invention will be described. In the following description, the configuration shown in FIG. 1B is assumed.

From the radio base stations 30-1, 30-2, ..., 30-n, channels CH1, CH2,
.., A case of transmitting to the mobile wireless device 50 using CHn will be described.

When the above-described channel switching preparation operation is completed, the wireless receiving circuit 68 of the mobile wireless device 50 includes the wireless base stations 30-1, 30-2,.
.., CHn from 0-n, which are sequentially switched by the changeover switch 64-1 in the mobile radio device 50, and received by switching. In addition, since the changeover switch 64-2 also starts operating, the transmission wave from the mobile radio device 50 also starts switching transmission.

Here, each of the radio base stations 30-1 to 30-30 is transmitted from the radio system controller 20.
The delay time difference due to the difference (within 10 km) between the respective routes to the mobile radio device 50 via -n is at most 0.03 ms or less, so that the operation can be ignored without any trouble.
The down signals from the radio base stations 30-2, 30-3,..., 30- (n-1) are only audio signals, but the radio base stations 30-1
In FIG. 2A, control signals (identification signals for identifying the radio base stations 30-1 and 30-n and switching command signals) are shown in FIG. Since the signal is inserted in the form of such an out-of-band signal, the wireless receiving circuit 68 of the mobile wireless device 50 receives the signal and transfers it to the control unit 58.

The control unit 58 identifies this signal, and
At first, a channel switching command from the wireless base station 30-1 and a call signal and an ID signal using the channel CHn from the wireless base station 30-n are sent, and it is confirmed that the signal quality is also good. Therefore, the radio transmission circuit 68 is used to use the out-of-band signal of the uplink communication signal, and
To the radio network controller 20 via the radio base station 30-n via the communication channel CHn.

In the radio system controller 20, the radio base station 30-n and the mobile radio
Since the communication with the communication unit 50 has been notified that the downstream communication is operating well, the communication control unit 21 switches the switches SW1-1 and SW1-1 of the switch group 23.
Of the 1-2,..., 1-n, only SW1-1 is turned off. on the other hand,
The mobile radio device 50 stops the transmission to the radio base station 30-1, stops the operation of the synthesizer 55-1 of the mobile radio device 50, and sets the changeover switch 64-1 (FIG. 1B) to the synthesizer. 55-
2, 55-3, ..., 55-n are caused to perform a cyclic switching operation.

 These states are shown in FIG.

Next, a case where transmission is performed from the mobile radio device 50 to the radio base stations 30-1, 30-2,..., 30-n using the channels CH1, CH2,.

In the mobile radio device 50, according to the instruction of the radio system control device 20,
The reception switching controller 65C and the transmission switching controller 67C operate respectively, and the changeover switches 64-1 and 64-2 respectively output the outputs of the operating synthesizers 55-1, 55-2,..., 55-n. And the output of 56-1,56-2,…, 56-n is switched
1, CH2,..., CHn are being sequentially switched and transmitted / received (FIG. 1B).
The signal transmitted to the communication channel during this operation includes a control signal (FIG. 2 (a)) outside the communication signal and out of band.
The state of the used channel of the mobile radio 50 (channels CH1, CH2,
, CHn to channels CH2, CH3,..., CHn), the identification ID of the mobile radio device 50, etc. (for example, FIG. 2 (a)).
It may be combined and f _D1 and f _D3 tone signal such as f _D1) of is added.

The uplink signal of the channel CHi received by the radio base station 30-i (i = 1, 2,..., N) is demodulated by the receiving unit 53 of the radio base station 30-i, and the demodulated audio signal and out-of-band signal After it is confirmed that there is no abnormality in the signal, the signal is transferred to the gateway exchange 20. In the radio system controller 20, among the n signals from the radio base stations 30-1, 30-2,.
-1,30-2, ..., 30-n are mixed. In the radio system controller 20, of the n signals from the radio base stations 30-1, 30-2,..., 30-n, the radio base stations 30-1, 30-2,. By the identification signal sent out of the band of the received voice,
Channel C from radio base stations 30-1, 30-2, ..., 30-n, respectively
Confirm that the signal is H1, CH2, ..., CHn.

The radio system controller 20 confirms that the channel switching operation during the call is proceeding smoothly, and checks the control unit 38 of the mobile radio 50.
, Via the radio base station 30-n, the communication with the radio base station 30-1 on the channel CH1 is stopped by the channel CHn, and the radio base stations 30-2, 30-3,. A command signal is sent to concentrate on the communication.

The mobile wireless device 50 that has received this control signal
By the operation of 58, the operations of the synthesizers 55-1 and 56-1 are stopped, and the position of the switch 64-1 for selecting the receiving channel is cyclically switched among the synthesizers 55-2, 55-3, ..., 55-n. Activate the switch 64-2 for selecting the transmission channel.
, The synthesizers 56-2, 56-3,..., 56-n are instructed to continue the circulation switching operation.

As a result, the mobile radio device 50 sets the channel CH1 up to that point.
Communication with the wireless base station 30-1 using the
30-2, 30-3,…, 30-n and channels CH2, CH3,…, CH, respectively
You are ready to communicate using n. With this, the channel switching is completed, and a state where communication is performed in the new wireless channel group is realized. The switching operation between the uplink channel and the downlink channel described above is executed in parallel and ends almost at the same time.

As is evident from the above description, there is no instantaneous interruption at the time of channel switching, and it is possible to keep noise at a low level that causes no practical problem.

If any of the above-mentioned operations cause a malfunction or a malfunction, the operation is restarted from the immediately preceding operation. When the operation failure is large, the control unit 58
There is also provided an operation for returning to the communication channel before the switching operation, which is stored in the memory unit built in the.

7A to 7D show FIGS. 1A, 1B and 1C.
A flow chart showing the flow of the operation of the system shown in the figure is shown.

The radio system controller 20, the radio base stations 30-1, 30-2,..., 30-n and the mobile radio device 50 start operating, and the switches SW1-1 and SW1-1 of the switch group 23 included in the radio system controller 20 are operated. 1-2, ..., 1- (n
-1) is on and the radio base stations 30-1, 30-2, ..., 30-
Communication is being performed between (n-1) and the mobile radio device 50. This communication includes the channels CH1, CH2,..., CH- (n-1) specified by the communication control unit 21 included in the radio network controller 20.
Downlink frequency F _1, F ₂ of, ..., F _n-1 and the uplink frequency f _1, f _2, ...,
f _n-1 is used (S101, Fig. 7A).

The communicating radio base stations 30-1, 30-2,..., 30- (n-1) constantly output a reception status report from the mobile radio device 50 (S102). S / N monitoring unit 2 of device 20
In 2 monitors whether or not deteriorated than call quality level L ₁ (S103). If speech quality is deteriorated than the level L ₁ (S103YES), the communication control unit 21, the radio base station 30-1, Surrounding like 30- (n-1) Radio For the base station 30, the radio base stations 30-1, 30-2,.
(N-1) and the mobile radio device 50 upstream frequency f _1, f ₂ are used to communicate between, ..., an instruction to monitor receive f _n-1 of the signal (S104).

In the periphery of each radio base station 30 instructs the received monitor received (e.g. 30-n), monitors the reception of the frequency f ₁ of the signal (S1
05), the result is reported to the S / N monitoring unit 22 of the radio network controller 20 (S106), and the monitor reception quality from each radio base station 30 is measured and compared, for example, the communication quality of the radio base station 30-n. There may be the level L ₂ of a certain standard, and detects that the best (S107YES).

Therefore, the communication control unit 21 determines that the mobile radio 50
It is determined that the mobile station has moved from the zone covered by -1 to the zone covered by the wireless base station 30-n (S108, FIG. 7B), and in order to switch to communication with the wireless base station 30-n, -n
Searches for a free channel that can be used (S10
9) As a result, the channel CHn is determined (S110). The communication control unit 21 includes a transmitting unit 51-2 and a receiving unit 53 of the mobile wireless device 50.
-2 is instructed to prepare for communication on channel CHn (S111).

The communication preparation command for using the channel CHn is sent to the radio base station 30-n to prepare for communication using the channel CHn (S112). This command is simultaneously transmitted from the wireless base station 30-1 through the channel CH1 (S113). Mobile radio 50
Receives the communication preparation command by this channel CHn (S11
4), preparation for enabling communication by channel CHn,
That is, for the control unit 58 Synthesizer 55-n and 56-n, receives a frequency F _n, and instructed to be transmitted in a frequency f _n, also switching oscillator 65 enters the switching operation (S11
5, Figure 7C).

When the preparation for communication using the channel CHn is completed, the mobile radio device 50 reports the completion of preparation to the radio base station 30-n using the channel CHn (S116). Upon receiving this report, the radio base station 30-n confirms the completion of the preparation in the radio base station 30-n using the channel CHn prepared in step S112 and issues a report (S117).

Radio base station 30-n and mobile radio 5 using channel CHn
When the radio control unit 20 confirms the completion of the communication preparation between the switches SW1-1 and 1-2, the switches SW1-1, 1-2, and
..., 1- (n-1) is kept on, and the switches SW1-n
Is also turned on (S119).

Therefore, the communication control unit 21 included in the wireless control device 20
Instruct the wireless base station 30-n to start communication with the mobile wireless device 50 using the channel CHn (S12)
0).

Upon receiving this communication start command (S121), the radio base station
30-n sends a communication start command using channel CHn (S
122). The mobile radio device 50 confirms the start of communication by the channel CHn by an ID signal which is an identification signal for identifying the radio base station 30-n (S123), and uses the channel CHn to
A communication signal including the signal is transmitted (S124), and the radio base station 30-n receiving this communication signal reports that communication has started on channel CHn (S125).

Upon receiving this report, it was confirmed that communication on channel CHn was started (S126). The S / N monitoring unit 22 of the radio network controller 20 checks the quality of communication between the mobile radio 50 and the radio base station 30-n. levels were measured, detects that it is a constant quality level L ₂ or more (S127YES, the 7D diagram) and the radio base station 30-1 the mobile radio 50
The wireless base stations 30-1 and 30-n are instructed to stop the communication performed using the channel CH1 between the wireless base stations 30-1 and 30-n (S128).

As a result, the wireless base station 30-1 turns off the communication by the channel CH1 (S129). In addition, the radio base station 30-n that has received the command to stop communication by the channel CH1 transfers the command (S130). When the mobile radio device 50 receives the command to stop communication by the channel CH1 (S131), the synthesizer 55-n 1
And the operation of 56-1 is stopped, and the changeover switch 64-1 stops switching to the output terminal of the synthesizer 55-1.
64-2 stops switching to the output terminal of synthesizer 56-1 (although this operation is not always necessary), and channel CH
The channel CH1 communication stop report is transmitted using the channel CHn so as to operate in 2, 3,..., N (S132). The wireless base station 30-n that has received this transfers the channel CH1 communication stop report (S133).

Radio system controller 20 receiving channel CH1 communication stop report
The communication control unit 21 of the switch group 23 includes switches SW1-2 and 1-
3, ..., 1-n are kept on, and the switch SW1-1 is turned off (S134).

As a result, the period of the channel switching operation ends, and the channel CH is switched on while the switches SW1-2, 1-3,...
2, CH3, ..., CHn down frequency _{F 2, F 3, ...,} F n uplink frequency f _2,
Using f ₃ ,..., f _n , the mobile radio 50
Between 0-3,..., 30-n, there is no momentary disconnection or noise contamination, and a transmission / reception diversity effect is obtained, so that high-quality communication can be continued (S135).

(6) Method of estimating the moving direction and moving speed of a mobile radio and allocating a communication channel for measures against traffic congestion Measure the change in the received electric field or communication quality received by a plurality of radio base stations 30 communicating with the mobile radio 50 Then, the traveling direction and speed of the mobile wireless device 50 can be detected by comparison. These will be described below with reference to FIG.

In FIG. 8, 16 circles indicate small zones Z1 to Z16 in the service area, respectively, from the radio base stations 30-1, 30-2,..., 30-16 installed near the center of the circle. , Respectively, indicate communicable areas. The mobile radio device 50 currently in communication is in the zone Z6, and the radio base stations 30-2, 30-3, 30-
It is assumed that communication with diversity is being performed with seven stations 5,30-6,30-7,30-10,30-11. Assuming that the mobile radio 50 is moving in the direction of the arrow in FIG.
In the above seven radio base stations receiving the transmission signal from
The reception electric field or reception quality is being measured, and these values are collected in the radio system controller 20. By comparing these measurement results, the radio system controller 20 estimates the moving direction and speed of the mobile radio device 50 by the following method.

First, it can be estimated that the moving direction is toward the wireless base station (30-7 in FIG. 8) in which the observed input reception electric field level changes in a direction in which it increases most rapidly. In order to obtain reliable results, it is important to select the measurement duration appropriately. However, this largely depends on the speed of the mobile radio 50. That is, since the radio wave propagation characteristics change every moment, a certain long time (3 to 10
(Seconds), and measurement is performed during the interval, thereby eliminating variation in measured values. FIG. 8 shows the measurement results obtained in this order from the radio base station 30 in which the input electric field increases in a large order. For example, 30-7>30-11> 30-3, and the input electric field decreases. If expressed in order from the wireless base station 30 having the largest value, 30-6>30-10>30-2> 36-5.

The moving speed can be estimated by comparing the moving speed with a radio wave propagation curve obtained from the radio wave propagation characteristics.

By using the above measurement results, the destination of the mobile radio device 50 is estimated, the communication traffic status of the radio base station 30 of the destination is checked, and when the radio base station 30 is congested, the radio base station
It is possible to reduce the number of wireless base stations 30 communicating with each other depending on the type of communication of the mobile wireless device 50 communicating at 30. Next, when the traffic congestion state extends over a plurality of zones instead of one zone, it is necessary to take measures for congestion over a wide area. This is a phenomenon occurring in a car telephone system or the like in the center of a large city, and it is assumed that 30-6, 30-7, and 30-11 in FIG. 8 are in a traffic congestion state. The application of the present invention to this will be described in detail.

It is assumed that a mobile radio device 50a is present in the zone Z11 and is traveling in the direction of the arrow, but has transmitted a call signal. This call signal is collected by the radio system controller 20, and a communication channel to be assigned is determined. When traffic is not congested, the radio base stations 30-6, 30-7, 30-10, 30- 11,30-12,30-1
A communication channel used in 4,30-15, etc. is allocated (diversity transmission / reception is performed). However, when traffic is congested at (Z6, 7, 11) in the above three zones, channels 30-6, 30-7 and 30-11 are not allocated. In this case, the radio base station 30 having the best communication quality is naturally 30-11 as a communication partner, but is not allocated for the above-described reason. If the multiplicity of diversity is 4
If the weight (30-10, 30-12, 30-14, 30-15) is insufficient, the radio system controller 20 can estimate the moving direction and the moving speed of the mobile radio device 50a. The channel used by the radio base station 30-8 or 30-16 in the direction is allocated.
Therefore, the mobile radio device 50a starts communication with the radio base stations 30-8 and 30-16 which are slightly distant even though they are in the zone Z11.

By applying the channel assignment described above,
It is possible to take measures against congestion in a high-traffic area that has not been solved by the conventional system technology.

(7) Reducing the switching frequency of the repetitive switching used when switching channels during a call, etc. (1) Location registration, (2) From calling operation (5) Channel switching during call and diversity effect Explanation and rationale, wireless base station 30B in each section up to
Or the switching frequency output from the transmission or reception switching controller 67C or 65C included in 30C (FIGS. 1D and 1F) or the mobile radio device 50 or 50B or 50C (FIGS. 1B and 1H). As for, the operation and effect have been described in the direction of increasing the speed. In this section, differently from this, the operation and effect when the switching frequency is lowered will be described. The low frequency here means a low frequency as compared with an audible frequency, specifically, 10 Hz or less.

First, the case where the switching frequency of the transmission switching controller 67C is reduced will be described. In this case also, equation (13) holds, but the number of transmitted carriers is not limited to one as described above. That it is expressed by the following equation Focusing on the carrier present in the carrier angular frequency Omega ₁ and the vicinity of the (13) of the right side section.

Equation (19) is transformed into the following equation.

I = I ₀ sin (Ω ₁ t + U ₁ (t)) + (n / π) sin (π / n) × [cos ｛(Ω ₁ -p) t + U ₁ (t)｝ -cos ｛(Ω ₁ + p) _{t + U 1 (t)}} ] + (n / 3π) sin (3π / n) × [cos {(Ω 1 -3p) t + U 1 (t)} -cos {(Ω 1 + 3p) t + U 1 (t)}] + (N / 5π) sin (5π / n) × [cos ｛(Ω ₁ -5p) t + U ₁ (t)｝ -cos ｛(Ω ₁ + 5p) t + U ₁ (t)｝] + ... (20) U _{1 (t) = s (t} ) + s c1 (t) above and below the carrier with an angular frequency Omega ₁ consisting mainly looking at (20), a number of carriers with an angular frequency represented by Omega ± np presence Will do. Moreover, even if a bandpass filter is provided at the output of the transmission mixer 61, the angular frequency difference between the carrier waves is p, and p is 2π
X (10 Hz) or less, it is not possible to filter. In more detail, these multiple carrier groups are all centered around a carrier having an angular frequency Ω ±
.., ± np,... exist in the same channel having a carrier, and these are transmitted from the antenna as transmission outputs.

By the way, if a large number of carriers are output from the antenna just above and below the central carrier, that is, only at a low frequency difference, the effect on other systems or other channels of the own system is Is described.

It can be concluded that there is no adverse effect in the above case. This is because in the above case, when viewed from another channel or another system, it can be regarded as the same carrier. That is, considering a signal component to noise (in this case, interference noise) D / U expressed as interference to other systems, D means a useful signal component of the system, and U represents an interference noise component. Both mean the power falling into the same channel, and if it is found that the noise component falls into the same channel, the noise component is the same as the noise power regardless of whether it has a single frequency or many different frequency components. Because it becomes.

Also, considering the frequency distribution of interference exerted on a signal having a frequency bandwidth, it is expected that interference power having a plurality of frequency components will be reduced more than a single frequency. That is, noise falling into a specific frequency among required signal frequencies is reduced in the latter case.

Next, a case where the signal transmitted in the above state is demodulated by the receiver will be described. In this case, the filter (not shown) provided at the output of the receiving mixer 63 does not perform the filtering function like the transmitter, so that the received signal (consisting of a large number of carriers) is converted into an intermediate frequency signal. The signal is amplified by the amplifier and input to the demodulator. Then, the signal is demodulated by the frequency discriminator. Here, a noise component having the following angular frequency is generated for the first time.

. ± .mp m = 1, 2, 3,..., And p is a low frequency, so it can be seen that many harmonics are generated in the low frequency region. Therefore, in this case, it is not advisable to use the lower frequency band of the voice band as shown in FIG. 2 (a) as the control signal in terms of interference, but rather the upper frequency band should be used. It became clear. Also, in order to avoid adverse effects on the audio signal, the value of p needs to be kept low (10 Hz or less).

Next, a case where the switching frequency of the reception switching controller 65C is reduced will be described. In this case as well, the equation (7) described above is satisfied, but the signal received and appearing at the output of the bandpass filter provided at the mixer output stage does not become a single wave as in the above-mentioned case, and (7) It must be considered that all the expressions (8) obtained by modifying the expressions are output. Therefore, a noise component having the following angular frequency is generated at the output of the frequency discriminator.

± mp m = 1,2,3,... However, for simplicity, it was assumed that equation (10) holds.

Therefore, also in this case, it has been found that a large number of harmonics are generated in the low frequency region, and the signal becomes unpleasant noise. Therefore, also in this case, it is not advisable to use the control signal in the lower sideband of the voice band as shown in FIG. 2 (a).

As is clear from the above description, the switching frequency of the repetitive switching used at the time of channel switching during communication or the like is easy to use because the higher speed has no adverse effect on the control signal using the lower frequency band of the audio signal. If it is confirmed that the signal used as a control signal is slightly affected, the low frequency switching operation also has the following advantages. That is, (i) all signal components (modulated waves) can be transmitted to the antenna as effective components without being partially filtered.

(Ii) For co-channel or adjacent channel interference, low frequency switching works in the direction of reducing interference.

(Iii) It is possible to reduce the cost of the reception or transmission switching controllers 65C and 67C or the switching switches 64-1 and 64-2.

[Effects of the Invention] As is clear from the above description, by applying the present invention to a mobile communication system using a small zone configuration, when a zone shift is performed during a call (communication) as in a conventional system, a temporary interruption occurs. In the case of facsimile signals and data signals, image quality degradation and burst-like signal errors have caused problems, but even if the frequency of channel switching during calls increases, this concern has been completely eliminated. In this case, economical transmission / reception diversity and communication quality improvement by adopting a plurality of location registrations from a plurality of radio base stations capable of satisfactorily communicating with the mobile radio device to the radio system controller to enable the diversity are realized. Improvements, effective use of frequency by reducing interference and interference, and technically enabling new services using wideband signals. In addition, communication quality is improved by effective use of wireless equipment when traffic is low, and when traffic increases sharply in a certain small zone, the available channels can be substantially increased. In addition to being able to process location registration signals from mobile radios, it is also possible to specify the effective communication channel by detecting the moving direction and speed of the moving object, making it economical and efficient in frequency use. Therefore, it is possible to construct a mobile communication system having a high level of effect, and the effect of the present invention is extremely large.

[Brief description of the drawings]

1A, 1B, and 1C are system configuration diagrams showing one embodiment of the present invention. FIGS. 1D and 1E are circuit configuration diagrams showing another embodiment of the radio base station of the present invention. FIG. 1F is a circuit configuration diagram showing one embodiment of the transceiver, FIGS. 1G, 1H and 1I are circuit configuration diagrams showing another embodiment of the mobile radio device, FIGS. 2 (a) and (b) ) Is a spectrum diagram and a circuit configuration diagram for explaining a configuration example of a control signal used in the present invention. FIG. 3 is a timing chart for explaining the operation of the system shown in FIGS. 1A to 1C. FIGS. 4A and 4B are flow charts showing the flow of the location registration operation of the present invention, respectively. FIGS. 5A and 5B are flow charts showing the flow of the calling operation from the mobile radio, FIGS. 6A, 6B and FIG. 6C is a flowchart showing the flow of an incoming call operation to the mobile radio, FIGS. 7A and 7B. , FIGS. 7C and 7D are flow charts showing the flow of the channel switching operation of the system shown in FIGS. 1A to 1C, and FIG. 8 explains the traveling direction and speed detection of the mobile radio. FIG. 9 is a conceptual diagram of a system configuration for explaining an example of a conventional system. 10: Telephone network, 11: Switchboard 12: Radio network controller, 13A-D ... Radio base station 14A-D ... Zone, 15: Mobile radio 16A-D ... Transmission line, 19 ... Gateway exchange 20 Radio control unit 21 Communication control unit 22, S / N monitoring unit 23 Switch group 24 ID identification storage unit 30, 30B, 30C, 30-1, to 30- n: radio base station 31, 31-1 to 31-n: transmission unit 32: radio base station control device 33, 33-1 to 33-n: reception unit 34, 34C, 34-1 to 34- n ID storage unit 35-1 to 35-n, 36-1 to 36-n Synthesizer 37 Communication quality monitoring unit 38, 38B, 38C Control unit 39 Interface 40, 40C Reference crystal oscillator 41: Transmit mixer, 42: Interference detector 43: Receive mixer 45: Reception switching controller 46: Wireless transmission circuit 47: Transmission switching controller 48: Wireless reception circuit 50 , 50B, 50C… mobile radio 51… transmitter 53, 53-1 to 53-n… receiver 55-1 to 55-n, 56-1 to 56-n… thin Sizer 58,58B, 58C, 58D Control unit 59 Telephone unit 61,61-1 to 61-n Transmit mixer 62 Interference detector 63,63-1 to 63-n Receive mixer 64-1,64-2,64-3 ... Switch 65C ... Reception controller 66,66-1 ~ 66-n ... Wireless transmission circuit 67C ... Transmission controller 68,68-1 … 68-n …… Wireless receiving circuit 69 …… Mixing circuit 71 …… Reference crystal oscillator 91 …… Digital encoding circuit 92 …… Multi conversion circuit 93-1 ～ 93-m …… Communication quality monitoring receiver 94… … Control transceiver 96 …… Antenna sharing device Z1 ～ Z16 …… Zone

Claims (60)

(57) [Claims] 1. A radio base means (30, B, C) which covers a plurality of zones to form a service area, and a mobile radio means (50, B, C) existing in said service area.
C, D), and when the mobile radio means transmits a position registration signal including its own identification information for registering a position, the position registration signal of each of the radio base means is transmitted to a predetermined communication quality. At least one communicable radio base means received in the above good condition is a radio system control means for supervising and managing each radio base means coupled to each radio base means by a transmission line. The position registration signal is transferred to (20), and the wireless system control unit transferred with the position registration signal transmits the identification information of the mobile wireless unit included in the position registration signal and the position from the mobile wireless unit. A communication method for mobile communication, comprising: registering identification information of at least one wireless base unit capable of receiving at least a registration signal received in a good state of a predetermined communication quality or higher. 2. When the mobile radio means (50, B, C, D) moves from a zone in which a location is registered and shifts to at least one new zone in which a location is to be newly registered, location registration is performed. 2. The communication method for mobile communication according to claim 1, wherein the communication is updated. 3. The mobile radio means (50, B, B) from a telephone of a general telephone network or another mobile radio means located in the service area connected via the radio system control means (20). When an incoming call to C, D) is made, the wireless connection means transmits through all the wireless base means (30, B, C) that can communicate with the mobile wireless means already registered. 2. The communication method for mobile communication according to claim 1, wherein an incoming call signal is transmitted to said mobile radio means. 4. At least one of a plurality of radio base means (30, B, C) communicating with said mobile radio means (50, B, C, D).
One has n transmitting means (90), and when communication of n channels or more is required due to an increase in communication traffic, at least one of the n transmitting means is required.
In the transmitting means, wherein the transmitting frequencies corresponding to the plurality of wireless channels are repeatedly switched at a speed sufficiently higher than the frequency of the communication signal to thereby transmit the plurality of wireless channels in parallel. 2. The communication method for mobile communication according to claim 1. 5. At least one of a plurality of radio base means (30B, C) communicating with said mobile radio means (50, B, C, D).
One of them has n receiving means (90), and if communication of more than n channels becomes necessary due to an increase in communication traffic, at least one of the n receiving means is required.
In the receiving means, the receiving frequencies corresponding to the plurality of wireless channels are repeatedly switched at a speed sufficiently higher than the frequency of the communication signal, whereby the receiving means is operated to receive the plurality of wireless channels in parallel. 2. The communication method for mobile communication according to claim 1. 6. When the radio system control means (20) registers the position registration signal, the radio base control means (30, B, C) related to the registered identification information at the same time as the position registration information. 2. The communication method for mobile communication according to claim 1, wherein the communication is returned to the mobile radio means (50, B, C, D) via the step (b) to store the reply. 7. The radio base station means (30, B, C) capable of communicating with the mobile radio means (50, B, C, D) already registered by the radio system control means (20). 4. The communication method for mobile communication according to claim 3, wherein, when transmitting an incoming call signal to said mobile radio means via a wireless communication means, said incoming call signal is transmitted in an order of higher communication quality at the time of registration. 8. The radio base station (30, B, C) which can communicate with the mobile radio means (50, B, C, D) registered by the radio system control means (20). When an incoming call signal is transmitted to the mobile radio means via the wireless base means, an identification signal for identifying each of the radio base means transmitting the incoming call signal is included and transmitted from each of the radio base means at the same time. The communication method of mobile communication according to claim 3, wherein 9. Radio base means (30, B, C) which respectively cover a plurality of zones to form a service area, and said radio base means (30, B, C) existing in said service area. C) mobile radio means (50,
B, C, D) and each of the radio base means and a general telephone network, and at least one of the radio base stations receiving the mobile radio means and the location registration signal from the mobile radio means in a good condition. Means for registering the identification information of the means; _ identification information registration means (22, 24) for updating and registering the identification information of the communicable radio base means with the movement of the mobile radio means; Communication path setting control means (21, 2) for canceling the setting of the communication path with the mobile radio means via the radio base means and for making and receiving calls.
3. A communication system for mobile communication, comprising: wireless system control means (20) having 3). 10. An ID identification storage means (20) for registering identification information of said wireless base means capable of communicating with said mobile wireless means and identification information of said mobile wireless means. 24); inspection means (22) for inspecting the communication quality between the mobile radio means and the radio base means; and at least one radio base means and the general telephone network or the radio communication means. A switch group means (23) capable of setting and canceling a communication path between base means; and setting and canceling the communication path in at least the switch group means based on identification information registered in the ID identification storage means. 10. A communication system for mobile communication according to claim 9, further comprising: a communication path control means (21) for outputting a control signal for performing communication. 11. The wireless base means (30) includes: a wireless receiving means (48) including a receiving mixer for receiving a designated wireless channel; and a wireless receiving means (48) for receiving the designated wireless channel by the receiving mixer. Receiving synthesizer means (35) for applying a required frequency to the radio signal; radio transmitting means (46) including a transmission mixer for transmitting the designated radio channel; and the designated radio channel to the transmission mixer. Transmitting synthesizer means (36) for applying a frequency necessary to transmit the signal; reference frequency oscillating means (40) for supplying a reference frequency to the receiving synthesizer means and the transmitting synthesizer means; Communication quality monitoring means (42) for monitoring the communication quality of the signal being received by the wireless receiving means and outputting communication quality information; ID identification storage means (34) for storing the registered identification information, and the radio channel to be received by the reception synthesizer means based on the identification information stored in the ID identification storage means. Control means for instructing the transmission channel to be transmitted to the transmission synthesizer means.
8. The communication system for mobile communication according to claim 9, comprising: 12. A reception synthesizer means for generating a frequency required for receiving i uplink radio channels satisfying 2 ≦ i ≦ n out of n uplink radio channels, said radio base means (30B). (35) receiving channel switching means for sequentially switching the output of the receiving synthesizer means at a speed sufficiently higher than the frequency of the communication signal so that the i uplink radio channels can be received in parallel. (44-1); transmission synthesizer means (36) for generating a frequency required for transmission of i downlink radio channels satisfying 2 ≦ i ≦ n among the n downlink radio channels; Transmission channel switching means (4) for sequentially switching the output of the transmission synthesizer means at a speed sufficiently higher than the frequency of the communication signal so that the downlink wireless channels can be transmitted in parallel. 4-2), a reference frequency oscillating means (40) for supplying a reference frequency to the receiving synthesizer means and the transmitting synthesizer means, and a frequency to be generated in the receiving synthesizer means and the transmitting synthesizer means. 10. The communication system for mobile communication according to claim 9, further comprising: a control unit (38B) for giving the instruction of (1), and giving an instruction of switching to said reception channel switching unit and said transmission channel switching unit. 13. The radio base unit (30C) includes: an antenna sharing unit (96); a plurality of transmission / reception units (90) each including a transmission unit and a reception unit connected to the antenna sharing unit; A plurality of communication quality monitoring means (93) for monitoring communication quality at least, at least one control transmission / reception means (94) for transmitting / receiving a control signal, the plurality of transmission / reception means (90), and At least one control transmission / reception means (94) is instructed to control the radio channel to be transmitted / received, and the plurality of communication quality monitoring means (93)
10. A communication system for mobile communication according to claim 9, further comprising: a control unit (38C) for instructing and controlling a wireless channel to be monitored. 14. A receiving synthesizer means (35) for generating a frequency required for receiving i uplink radio channels satisfying 2 ≦ i ≦ n among n uplink radio channels. ), And receiving channel switching for sequentially switching the output of the receiving synthesizer means (35) at a speed sufficiently higher than the frequency of the communication signal so that the i uplink radio channels can be received in parallel. Means (44-1); transmitting synthesizer means (36) for generating a frequency required for transmitting i number of downlink radio channels satisfying 2 ≦ i ≦ n out of n number of downlink radio channels; Transmission channel switching means (44-) for sequentially switching the output of the transmission synthesizer means at a speed sufficiently higher than the frequency of the communication signal so that the downlink radio channels can be transmitted in parallel. 14. The communication system for mobile communication according to claim 13, comprising: 15. A receiving synthesizer means (55) for generating a frequency necessary for receiving i radio channels satisfying 2 ≦ i ≦ n among the n radio channels. Receiving channel switching means for sequentially switching the output of the receiving synthesizer means (55) at a speed sufficiently higher than the frequency of the communication signal so that the i wireless channels can be received in parallel. 64-1), and a wireless receiving means (63) including a receiving mixer (63) for receiving the i wireless channels by applying an output of the receiving synthesizer means (35) via the receiving channel switching means. 68); transmission synthesizer means (56) for generating a frequency required for transmission of i wireless channels satisfying 2 ≦ i ≦ n among the n wireless channels; and I Transmission channel switching means (64-2) for sequentially switching the output of the transmission synthesizer means at a speed sufficiently higher than the frequency of the communication signal so that transmission can be performed; and the transmission synthesizer means (56). An output is applied via the transmission channel switching means (64-2), and a wireless transmission means (66) including a transmission mixer (61) for transmitting the i wireless channels; and the transmission synthesizer means ( 56) and a reference frequency oscillating means (71) for supplying a reference frequency to the receiving synthesizer means (55); and a communication quality monitoring means (62) for monitoring the communication quality received by the wireless receiving means. ), Giving a switching instruction to the reception channel switching means and the transmission channel switching means, and causing the reception synthesizer means and the transmission synthesizer means to generate a switching instruction. Communication system for mobile communication of paragraph 9, wherein the following claims, including a control means (58) for the indication of the frequency. 16. A receiving synthesizer means (55) for generating a frequency necessary for receiving i radio channels satisfying 2 ≦ i ≦ n among the n radio channels. Receiving channel switching means (64-1) for sequentially switching the output of the receiving synthesizer means at a speed sufficiently higher than the frequency of the communication signal so that the i wireless channels can be received in parallel. Wireless reception means (68) including a reception mixer (63) for receiving an output of the reception synthesizer means via the reception channel switching means and receiving the i wireless channels; Transmitting synthesizer means (56) for generating a frequency required for transmission of i wireless channels satisfying 2 ≦ i ≦ n among the wireless channels, and transmitting the i wireless channels in parallel Transmission channel switching means (64-2) for sequentially switching the output of the transmission synthesizer means (56) at a speed sufficiently higher than the frequency of the communication signal so as to enable the transmission synthesizer means (56) Wireless transmission means (66) including a transmission mixer (61) for transmitting the output of i through the transmission channel switching means (64, 67) and transmitting the i wireless channels; and a wireless channel to be received. Channel switching means (64-) for sequentially switching the output of the receiving synthesizer means (55) at a low speed so that the signals can be sequentially received.
3) the C / N for outputting the C / N data by measuring the carrier-to-noise ratio of the i radio channels by applying the output of the receiving synthesizer means through the measuring channel switching means; Receiving means for N measurement (52), collating the C / N data and giving a switching instruction to the reception channel switching means, the transmission channel switching means and the measurement channel switching means, 10. The mobile communication system according to claim 9, further comprising control means (58B) for instructing said transmission synthesizer means of a frequency to be generated. 17. A receiving synthesizer means (55) for generating a frequency necessary for receiving i radio channels satisfying 2 ≦ i ≦ n out of n radio channels, wherein said mobile radio means (50C). And a wireless receiving means (68) including a receiving mixer for receiving the i wireless channels by receiving the outputs of the receiving synthesizer means, and i ≦ n ≦ n among the n wireless channels. Communication means (56) for generating a frequency necessary for transmission of the wireless channels, and an output of the transmission synthesizer means for transmitting the i wireless channels in parallel. Transmission channel switching means (64-2) for sequentially switching at a speed sufficiently faster than the frequency of the signal; and an output of the transmission synthesizer means is applied via the transmission channel switching means. Wireless transmitting means including a transmission mixer for transmitting said i pieces of radio channels Te (66)
A reference frequency oscillating unit (71) for supplying a reference frequency to the transmitting synthesizer unit and the receiving synthesizer unit; and a communication signal from a wireless receiving unit that has received the i wireless channels. Mixing means (69) for obtaining a mixed communication signal, and giving a switching instruction to the transmission channel switching means, and giving an instruction of a frequency to be generated to the reception synthesizer means and the transmission synthesizer means. Control means (58
10. The mobile communication system according to claim 9, comprising: C). 18. A receiving synthesizer means (55) for generating a frequency required for receiving i radio channels satisfying 2 ≦ i ≦ n out of n radio channels, wherein said mobile radio means (50D). Wireless receiving means (68) including a receiving mixer for receiving the i wireless channels by receiving the outputs of the receiving synthesizer means; and 2 ≦ i ≦ n among the n wireless channels. a transmission synthesizer means (56) for generating a frequency required for transmission of the i wireless channels, and a transmission mixer for transmitting the i wireless channels by applying outputs of the transmission synthesizer means, respectively. Wireless transmission means (66) including: a reference frequency oscillation means (71) for supplying a reference frequency to the transmission synthesizer means and the reception synthesizer means; Mixing means (69) for mixing the communication signals from the wireless receiving means having received the i wireless channels to obtain a mixed communication signal; and the mixing means (69) to be generated in the receiving synthesizer means and the transmitting synthesizer means. The communication system for mobile communication according to claim 9, further comprising control means (58D) for instructing a frequency. 19. The mobile radio means (50, B, C, D) comprises ID roam area collation storage means (54) for storing identification information registered in the radio system control means. The communication system for mobile communication according to claim 9. 20. Mobile communication communication including each radio base means which covers a plurality of zones to form a service area, and radio system control means for connecting each radio base means to a general telephone network. In the network, the mobile radio means (50, B, C, D) are the same to enable communication between the mobile radio means located in the service area and the radio base means. A wireless transmission process (66) and a wireless reception process (68) for performing diversity transmission / reception of at least one communication signal using at least one wireless channel, wherein the wireless system control means (20) The communication path setting, release and communication between at least one of the radio base means (30, B, C) and the mobile radio means having received the location registration signal in a good condition of a predetermined communication quality or more. Radio base Communication method for a mobile communication, characterized by a control process so as to allow diversity reception by the change of the speech path to the updating means. 21. The mobile radio means (50, B, C,...) Based on an instruction from at least one of the mobile radio means and the radio base means (30, B, C).
21. The communication method of mobile communication according to claim 20, wherein the communication method of the mobile communication according to claim 20, wherein the communication device performs the operation of registering the position information of D) and setting, canceling, and changing the communication path based on the position information. 22. When the mobile radio means (50, B, C, D) transmits a call signal, all the radio base means (30, B, B) existing in the vicinity of receiving the call signal satisfactorily. , C), together with the identification information of the mobile radio means, operates to transmit the identification information and the reception quality information of the radio base means having received the identification information to the radio system control means. 20. The communication method of mobile communication according to item 20. 23. When the mobile radio means (50, B, C, D) is communicating with a plurality of radio base means (30, B, C) present in the vicinity, the mobile radio means (50, B, C, D) is in the service area during the communication. When the communication traffic fluctuates in the area covered by the wireless base means, the number of wireless base means participating in the communication is changed in consideration of a priority given to a predetermined type of communication. 21. The communication method for mobile communication according to claim 20, wherein the wireless system control means (20) controls the communication. 24. A radio wave propagation characteristic changes during communication between said mobile radio means (50, B, C, D) and a plurality of radio base means (30, B, C) present in the vicinity, and communication quality is reduced. If affected,
21. Communication for mobile communication according to claim 20, wherein said wireless system control means (20) controls the number of said wireless base means to be communicated to maintain said communication quality at or above a required level. Method. 25. While the mobile radio means (50, B, C, D) communicates with a plurality of radio base means (30, B, C) present in the vicinity, the mobile radio means (50, B, C, D) communicates with one of the radio base means. When the communication quality of the communication path of the communication path falls below a predetermined level, the communication path is released, and a new communication path is established between the communication path and the radio base means capable of securing communication quality satisfying the predetermined level. 21. The communication method for mobile communication according to claim 20, wherein said wireless system control means (20) controls so as to provide a communication path. 26. Reception performed by a plurality of radio base means while the mobile radio means (50, B, C, D) communicates with a plurality of radio base means (30, B, C) present in the vicinity. The radio system control means (20) detects the traveling direction and speed of the mobile radio means based on a change in reception quality including the electric field, estimates the destination, and investigates the communication traffic situation of the radio base means at the destination. Then, when in a congested state, the number of radio base units communicating with the other mobile radio unit may be reduced according to the type of communication of the other mobile radio unit communicating with the radio base unit at the destination. 21. The communication method of mobile communication according to claim 20, wherein the wireless system control means controls the communication. 27. Reception received by the plurality of wireless base means (30, B, C) while the mobile wireless means (50, B, C, D) is communicating with a plurality of wireless base means existing in the vicinity. The radio system control means (20) detects the traveling direction and speed of the mobile radio means based on a change in the reception quality including the electric field, and when the channel is switched during communication, the radio station owned by the radio base means in the traveling direction. 21. The communication method for mobile communication according to claim 20, wherein the wireless system control means controls so as to preferentially assign a wireless channel capable of ensuring a predetermined communication quality among the channels. 28. The mobile radio means according to a change in communication quality including a reception electric field received by a plurality of radio base means (30, B, C) communicating with the mobile radio means (50, B, C, D). 21. The communication method for mobile communication according to claim 20, wherein said wireless system control means (20) operates so as to detect a traveling direction, a speed and a position of the vehicle. 29. At least one of said mobile radio means (50, B, C, D) and said plurality of communicating radio base means (30, B, C) transmit data corresponding to a plurality of radio channels. 21. The communication method for mobile communication according to claim 20, wherein the communication method operates to transmit a plurality of wireless channels in parallel by repeatedly switching the frequency at a speed sufficiently higher than the frequency of the communication signal. 30. At least one of the mobile radio means (50, B) and the plurality of communicating radio base means (30, B, C) transmits a reception frequency corresponding to a plurality of radio channels to a communication signal. 21. The communication method of mobile communication according to claim 20, wherein the communication method operates so as to receive a plurality of wireless channels in parallel by repeatedly switching at a speed sufficiently higher than the frequency of the mobile communication. 31. When the mobile radio means (50, B, C, D) is present in a zone where communication traffic is congested,
As a communication partner of the mobile radio means, communication with the radio base means (30, B, C) which further increases the congestion state is not permitted, and a radio which can secure a predetermined communication quality among the radio base means other than the radio base means (30, B, C) 21. The communication method for mobile communication according to claim 20, wherein the wireless system control means (20) controls so as to allocate a wireless channel so as to communicate with a base means. 32. At least one of the plurality of radio base means (30B, C) communicating with the mobile radio means (50, B, C, D) has n transmission means, When communication of n channels or more is required due to an increase in communication traffic, at least one of the n transmission means transmits transmission frequencies corresponding to a plurality of radio channels to the frequency of a communication signal. 21. The communication method for mobile communication according to claim 20, wherein the communication method operates so as to transmit a plurality of wireless channels in parallel by repeatedly switching at a speed sufficiently faster than that. 33. At least one of the plurality of radio base means (30B, C) communicating with the mobile radio means (50, B, C, D) has n reception means, When communication of n channels or more becomes necessary due to an increase in communication traffic, at least one of the n receiving means changes the reception frequency corresponding to a plurality of radio channels to a communication signal. 21. The communication method for mobile communication according to claim 20, wherein the communication method operates so as to receive a plurality of wireless channels in parallel by repeatedly switching at a speed sufficiently higher than the frequency. 34. Between each radio base means which covers a plurality of zones to form a service area, and at least one radio base means (30, B, C) existing in the service area. Mobile radio means (50, B, C, D) having radio transmission / reception means (46, 48) for diversity transmission / reception of at least one communication signal using at least one radio channel; Identification information of the mobile radio means and the radio base means based on the communication quality between the at least one radio base means and the mobile radio means, which received the location registration signal in a good condition of a predetermined communication quality or more. Information registration means (24) for registering a communication path, and release of communication channel setting based on the identification information, and communication with a newly communicable radio base means with the movement of the mobile radio means. Road to allow diversity reception by adding, with normal telephone network communication channel setting means can be connected (21,2
And (23) a wireless system control means (20). 35. The wireless system control means (20) comprises: identification information of the wireless base means (30, B, C) capable of communicating with the mobile wireless means (50, B, C, D); ID identification storage means (24) for registering identification information of wireless means, inspection means (22) for inspecting communication quality between the mobile wireless means and the wireless base means, at least one A switch group means (23) capable of setting and canceling a communication path between the wireless base means and the general telephone network or between the wireless base means; and an identification information registered in the ID identification storage means. 35. Communication for mobile communication according to claim 34, further comprising: communication control means (21) for outputting a control signal for setting and canceling said communication path to at least said switch group means. system. 36. The ID identification storage means (24) registers position information of the mobile radio means based on an instruction from at least one of the mobile radio means and the radio base means (30, B, C), 36. The mobile communication system according to claim 35, wherein said communication control means (21) sets, releases, and changes said communication path based on said position information. 37. The wireless base means (30), comprising: a wireless receiving means (48) including a receiving mixer for receiving a designated wireless channel; and receiving the designated wireless channel by the receiving mixer. Receiving synthesizer means (35) for applying a required frequency to the radio signal; radio transmitting means (46) including a transmission mixer for transmitting the designated radio channel; and the designated radio channel to the transmission mixer. Transmitting synthesizer means (36) for applying a frequency necessary to transmit the signal; reference frequency oscillating means (40) for supplying a reference frequency to the receiving synthesizer means and the transmitting synthesizer means; A communication quality monitoring unit (37) for monitoring communication quality of a signal being received by the wireless receiving unit and outputting communication quality information; ID identification storage means (34) for storing the registered identification information, and the wireless channel to be received by the reception synthesizer means based on the identification information stored in the ID identification storage means. Control means (3) for instructing the wireless channel to be transmitted to the transmitting synthesizer means.
35. The communication system for mobile communication according to claim 34, comprising: 38. A radio base station (30B, C) comprising: a reception base for generating a frequency necessary for receiving i uplink radio channels satisfying 2 ≦ i ≦ n out of n uplink radio channels; Synthesizer means (35) Reception channel switching means for sequentially switching the output of the reception synthesizer means at a speed sufficiently higher than the frequency of the communication signal so that the i uplink radio channels can be received in parallel. (44-1); transmission synthesizer means (36) for generating a frequency required for transmission of i downlink radio channels satisfying 2 ≦ i ≦ n among the n downlink radio channels; Transmission channel switching means (44-2) for sequentially switching the output of the transmission synthesizer means at a speed sufficiently higher than the frequency of the communication signal so that the downlink wireless channels can be transmitted in parallel. A reference frequency oscillating means (40) for supplying a reference frequency to the receiving synthesizer means and the transmitting synthesizer means; and giving an instruction of a frequency to be generated to the receiving synthesizer means and the transmitting synthesizer means. 35. The mobile communication system according to claim 34, further comprising: control means (38B, C) for giving a switching instruction to said reception channel switching means and said transmission channel switching means. 39. The radio base means (30C) includes: an antenna sharing means (96); a plurality of transmitting / receiving means (90) each including a transmitting means and a receiving means connected to the antenna sharing means; A plurality of communication quality monitoring means (93) for monitoring communication quality, at least one control transmission / reception means (94) for transmitting / receiving a control signal, and the plurality of transmission / reception means and at least one 34. A control means (38C) for instructing and controlling the wireless channels to be transmitted and received by the control transmitting / receiving means, and instructing and controlling the wireless channels to be monitored by the plurality of communication quality monitoring means. A communication system for mobile communication according to claim 1. 40. A receiving synthesizer means (35) for generating a frequency necessary for receiving i uplink radio channels satisfying 2 ≦ i ≦ n out of n uplink radio channels. ) And reception channel switching means (44) for sequentially switching the output of the reception synthesizer means at a speed sufficiently higher than the frequency of the communication signal so that the i uplink radio channels can be received in parallel. -1); transmitting synthesizer means (36) for generating a frequency necessary for transmission of i downlink radio channels satisfying 2 ≦ i ≦ n out of the n downlink radio channels; Transmission channel switching means (44-2) for sequentially switching the output of the transmission synthesizer means at a speed sufficiently higher than the frequency of the communication signal so that the wireless channels can be transmitted in parallel; Control means (38C) for giving an instruction of a frequency to be generated to the reception synthesizer means and the transmission synthesizer means, and for giving an instruction of switching to the reception channel switching means and the transmission channel switching means. 40. The communication system for mobile communication according to claim 39. 41. The control means (38, B, C) includes: when the mobile radio means (50, B, C, D) transmits a call signal and receives the call signal satisfactorily, 39. The system according to claim 37, wherein the identification information of the mobile base station receiving the identification information and the reception quality information together with the identification information of the mobile radio unit are controlled to be returned to the mobile radio unit. 41. The communication system for mobile communication according to paragraph 39, paragraph 39 or paragraph 40. 42. The control means (38, B, C), when the mobile radio means (50, B, C, D) is communicating with its own radio base means, in an area covered by its own radio base means, 38. The method according to claim 37, wherein when communication traffic fluctuates, control is performed so as to determine whether to participate in said communication in consideration of a priority given to a predetermined type of communication. 41. The communication system for mobile communication according to paragraph 38, paragraph 39, paragraph 39 or paragraph 40. 43. When the control means (38, B, C) changes the radio wave propagation characteristic during communication with the mobile radio means (50, B, C, D) and is affected by the communication quality. The method according to claim 37, wherein when it is determined that it is difficult to maintain the communication quality at or above a required level, the mobile radio means is controlled to request a stop of the communication.
41. A communication system for mobile communication according to paragraph 38, 39 or 40. 44. When the control unit (38, B, C) communicates with the mobile radio unit (50, B, C, D), when the communication quality of the communication path falls below a predetermined level. To inform the mobile radio means that the communication path is released and a new communication path is provided between the new radio base means and the new radio base means capable of securing communication quality satisfying the predetermined level. Claims 37, 38,
41. The communication system for mobile communication according to item 39 or 40. 45. The mobile radio means according to a change in reception quality including a reception electric field to be received during communication with the mobile radio means (50, B, C, D). The traveling direction and speed of the mobile station, the destination is estimated, the communication traffic situation of the other wireless base means at the destination is investigated, and the radio base means (30, B , C) controlling to stop communication with the other wireless base means communicating with the other mobile wireless means according to the type of communication of the other mobile wireless means communicating in C). Clause 37, 38, 39 or 40
A communication system for mobile communication according to claim 1. 46. The mobile radio means, wherein the control means (38, B, C) communicates with the mobile radio means (50, B, C, D) by a change in reception quality including a reception electric field to be received. When the channel is switched during communication by detecting the traveling direction and speed of the wireless base station, the wireless channel that can secure a predetermined communication quality among the wireless channels owned by the other wireless base means in the traveling direction has priority. 41. The communication system for mobile communication according to claim 37, wherein said another wireless base means is contacted so as to assign to said wireless base station. 47. The control means (38, B, C), the mobile radio means (50, B, C, D) of the mobile radio means by a change in communication quality including a received electric field received during communication. 41. The mobile communication system according to claim 37, wherein the traveling direction, speed and position are detected. 48. The control means (38B, C) switches a plurality of radio channels in parallel by repeatedly switching transmission frequencies corresponding to the plurality of radio channels at a speed sufficiently higher than the frequency of a communication signal. Claims 38, 39, or 40 that control transmission.
41. A communication system for mobile communication according to item 40. 49. The control means (38B, C) switches a plurality of radio channels in parallel by repeatedly switching reception frequencies corresponding to the plurality of radio channels at a speed sufficiently higher than the frequency of a communication signal. 41. The communication system for mobile communication according to claim 38, 39 or 40, wherein the communication is controlled so as to be received. 50. When the control means (38, B, C) is present in a zone where communication traffic is congested, a predetermined communication partner of the mobile radio means (50, B, C, D) is provided. 41. The mobile radio means according to claim 37, 38, 39, or 39, wherein said mobile radio means is instructed to communicate with another radio base means capable of ensuring communication quality of said mobile radio means.
41. A communication system for mobile communication according to item 40. 51. When the control means (38C) requires communication over the number of channels of the transmitting / receiving means due to an increase in communication traffic, at least one of the plurality of transmitting means is provided. The transmission means corresponding to a plurality of wireless channels is controlled so as to transmit a plurality of wireless channels in parallel by repeatedly switching transmission frequencies corresponding to the plurality of wireless channels at a speed sufficiently higher than the frequency of the communication signal. 40. A communication system for mobile communication according to claim 39. 52. When the control means (38C) requires communication over the number of channels of the transmitting / receiving means due to an increase in communication traffic, at least one of the plurality of receiving means is provided. In the receiving means, the receiving frequency corresponding to the plurality of wireless channels is repeatedly switched at a speed sufficiently higher than the frequency of the communication signal to thereby control the receiving of the plurality of wireless channels in parallel. 40. A communication system for mobile communication according to claim 39. 53. A receiving synthesizer means (55) for generating a frequency necessary for receiving i radio channels satisfying 2 ≦ i ≦ n among the n radio channels. Receiving channel switching means (64-1) for sequentially switching the output of the receiving synthesizer means so that the i wireless channels can be received in parallel; and outputting the output of the receiving synthesizer means. Wireless receiving means (68) including a receiving mixer applied via said receiving channel switching means for receiving said i wireless channels;
Transmitting synthesizer means (56) for generating a frequency required for transmission of i wireless channels satisfying 2 ≦ i ≦ n among the n wireless channels; and transmitting the i wireless channels in parallel. Transmission channel switching means (64-2) for sequentially switching the output of the transmission synthesizer means at a speed sufficiently higher than the frequency of the communication signal so that transmission can be performed; and Wireless transmission means (66) including a transmission mixer applied through the transmission channel switching means for transmitting the i wireless channels;
A reference frequency oscillating means (71) for supplying a reference frequency to the transmission synthesizer means and the reception synthesizer means; and giving a switching instruction to the reception channel switching means and the transmission channel switching means. 35. The mobile communication system according to claim 34, further comprising: a control unit (58) for instructing the receiving synthesizer unit and the transmitting synthesizer unit on a frequency to be generated. 54. A receiving synthesizer means (55) for generating a frequency necessary for receiving i radio channels satisfying 2 ≦ i ≦ n out of n radio channels, wherein said mobile radio means (50B) Receiving channel switching means (64-1) for sequentially switching the output of the receiving synthesizer means at a speed sufficiently higher than the frequency of the communication signal so that the i wireless channels can be received in parallel. Wireless receiving means (68) including a receiving mixer for receiving the i wireless channels by applying the output of the receiving synthesizer means via the receiving channel switching means.
Transmitting synthesizer means (56) for generating a frequency required for transmission of i wireless channels satisfying 2 ≦ i ≦ n among the n wireless channels; and transmitting the i wireless channels in parallel. Transmission channel switching means (64-2) for sequentially switching the output of the transmission synthesizer means at a speed sufficiently higher than the frequency of the communication signal so that transmission can be performed; and Wireless transmission means (66) including a transmission mixer applied through the transmission channel switching means for transmitting the i wireless channels;
Measurement channel switching means (64-3) for sequentially switching the output of the receiving synthesizer means at a low speed so that the wireless channel to be received can be sequentially received; and the output of the receiving synthesizer means. C / N data measurement receiving means (52) which is applied through the measurement channel switching means to measure the carrier-to-noise ratio of the i wireless channels and output C / N data; The C / N data is collated to give a switching instruction to the reception channel switching means, the transmission channel switching means, and the measurement channel switching means, and a frequency to be generated in the reception synthesizer means and the transmission synthesizer means. 35. The mobile communication system according to claim 34, further comprising control means (58B) for giving an instruction. 55. A receiving synthesizer means (55) for generating said mobile radio means (50C) a frequency necessary for receiving i radio channels satisfying 2 ≦ i ≦ n out of n radio channels. Wireless receiving means (68) including a receiving mixer for receiving the i wireless channels by receiving the outputs of the receiving synthesizer means; and 2 ≦ i ≦ n among the n wireless channels. transmitting synthesizer means (56) for generating a frequency required for transmission of the i wireless channels, and an output of the transmitting synthesizer means so that the i wireless channels can be transmitted in parallel. Transmission channel switching means (64-2) for sequentially switching at a speed sufficiently higher than the frequency of the communication signal; and applying the output of the transmission synthesizer means via the transmission channel switching means. Is by wireless transmission means including a transmission mixer for transmitting said i pieces of radio channels (66)
A reference frequency oscillating unit (71) for supplying a reference frequency to the transmitting synthesizer unit and the receiving synthesizer unit; and a communication quality monitor for monitoring communication quality received by the i wireless receiving units. Communication quality monitoring means (62); mixing means (69) for mixing communication signals from the wireless reception means having received the i wireless channels to obtain a mixed communication signal; Control means (58) for giving a switching instruction and instructing the receiving synthesizer means and the transmitting synthesizer means of a frequency to be generated.
35. The mobile communication system according to claim 34, comprising: C). 56. The control means (58, B, C) repetitively switches transmission frequencies corresponding to a plurality of radio channels at a speed sufficiently higher than the frequency of a communication signal, so that a plurality of radio waves are transmitted in parallel. Claim 53. Claim 54, Claim 54, or Claim 54, wherein the channel is controlled to be transmitted.
56. A mobile communication system according to claim 55. 57. The control means (58, B) switches a plurality of radio channels in parallel by repeatedly switching reception frequencies corresponding to the plurality of radio channels at a speed sufficiently higher than the frequency of a communication signal. 55. The mobile communication system according to claim 53, wherein the communication is controlled to receive. 58. When the control means (58, B, C, D) is present in a zone where communication traffic is congested, the mobile radio means (50, B, C, D) is provided with Communication with the radio base means (30, B, C) which further increases the congestion state as a partner is not allowed, and communication is performed with radio base means capable of ensuring a predetermined communication quality among the radio base means other than the base station. 56. The communication system for mobile communication according to claim 53, wherein the communication is controlled so as to select a wireless channel. 59. A receiving synthesizer means (55) for generating a frequency required for receiving i radio channels satisfying 2 ≦ i ≦ n out of n radio channels, wherein said mobile radio means (50D) Wireless receiving means (68) including a receiving mixer for receiving the i wireless channels by receiving the outputs of the receiving synthesizer means; and 2 ≦ i ≦ n among the n wireless channels. a transmission synthesizer means (56) for generating a frequency required for transmission of the i wireless channels, and a transmission mixer for transmitting the i wireless channels by applying outputs of the transmission synthesizer means, respectively. Wireless transmission means (66) including: a reference frequency oscillation means (71) for supplying a reference frequency to the transmission synthesizer means and the reception synthesizer means; Mixing means (69) for mixing the communication signals from the wireless receiving means having received the i wireless channels to obtain a mixed communication signal; and the mixing means (69) to be generated in the receiving synthesizer means and the transmitting synthesizer means. 35. The mobile communication system according to claim 34, further comprising control means (58D) for instructing a frequency. 60. The mobile radio means (50, B, C, D) comprises ID roam area collation storage means (54) for storing identification information registered in the radio system control means. A communication system for mobile communication according to claim 34.