JPS596536B2 - Mobile communication method - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a communication system using a mobile radio line in which mobile radio devices with different transmission powers coexist.

Conventionally, in this type of communication system, when mobile radios with different transmission outputs are used together, the radio zone is set so that the required quality is satisfied when the mobile radio with the higher transmission output is used. If a mobile radio with a smaller transmission power is used, the user should be aware of the deterioration in quality, or use a mobile radio with a smaller transmission power to meet the required quality. Wireless zones were defined, and mobile radios with high transmission output were used with lower transmission output. Therefore, in the former method, the quality deteriorates around the wireless zone for mobile radios with low transmission power, and in the latter method, the wireless zone radius becomes smaller, resulting in an increase in the number of base stations, resulting in undesirable results. There was an economic drawback.

In order to solve these drawbacks, the present invention attempts to make effective use of mobile radio lines by compensating for the lack of transmission power only for mobile radios with low transmission power.

Prior to explaining the present invention, a conventional system will first be explained.

FIG. 1 is a diagram showing the configuration of a conventional base station radio equipment for a car telephone system.

In the figure, antennas 1-1 to 1-4 are arranged horizontally every 900 meters. The hybrids 2-1 to 2-4 combine the outputs of the antennas 1-1 to 1-4 and are combined so that the antennas are omnidirectional in the horizontal plane. Circulator 3-1
Since the antennas 1-1 to 1-4 are used for both transmission and reception, antennas 1-3-4 are used to distribute the terminals into a transmission terminal and a reception terminal.

The received waves distributed by the circulator pass through receiving filters 4-1 to 4-4, and then to receiving common amplifiers 5-1 to 5-5.
Commonly amplified by 4 and divided into N by receiving distributors 6-1 to 6-4, receivers RX-11 to RX-1N, RX-21 to R
X-2N, RX31~RX-3N and RX-41~R
Input to X-4N.

On the other hand, transmitters TX-11 to TX-1N, TX-21 to TX
-2N, TX-31~TX-3N and TX-41・~
The output of TX-4N is from cavity resonators 7-11 to 7-1N,
7-21~7-2N, 7-31~7-3N and 7-4
1 to 7 - 4N, combined into 4 outputs by combiners 8-1 to 8-4, passed through transmission filters 9-1 to 9-4, and used for transmission by circulators 3-1 to 3-4. Terminal 10-1~
10-4, synthesized by hybrids 2-1 to 2-4, and radiated non-directionally in the horizontal plane by antennas 1-1 to 1-4.

As described above, 4·N channels can be shared for both transmission and reception.

(Refer to Research and Practical Application Report Vol. 26, 7l67, 1977, Published by Nippon Telegraph and Telephone Public Corporation Telecommunications Research Institute, Mishima et al. [Base station antenna/common system for car phone system]) However, in contrast to the above system, car phone radio If mobile phone radios with smaller transmission outputs are used together, the quality of calls will deteriorate around the wireless zone for the mobile phone radios.

Next, the present invention will be explained with reference to the drawings.

FIG. 2 is a diagram showing the configuration of a base station in an embodiment of the present invention. 7-1
N1 coupler 8-L transmission filter 9-L transmitter TX-
11 to TX-1N have the same structure as the conventional one shown in FIG.

Although not shown in this figure, transmitters TX-21 to
TX-2N, TX-31 to TX-3N1 and TX-4
The system of transmitters 1 to TX-4N also has the same configuration as the transmitters TX-11 to TX-1N. Circulator 3 for transmitting and receiving wave distribution
Unlike FIG. 1, antennas 1 to 3-4 are inserted between antennas 1-1 to 1-4 and hybrids 2-1 to 2-4.

Therefore, the received wave output terminals VE, VN, VS, VW of the circulators 3-1 to 3-4 and the antennas 11 to 1-
The loss between 4 and 4 is 6 dB less than the conventional case shown in Fig. 1, which is the hybrid loss, and the directivity is 9 dB for each.
0 It's nostalgic. Received wave output terminal V.

, VN, VS, and w pass through receiving filters 4-1 to 4-4, and then to receiving common amplifiers 5-1 to 5-5.
4 is commonly amplified, and M
distributed. Outputs from each of these outputs from one terminal 5564 are combined by a combiner 151 and sent to a receiving common amplifier 1.
The signals are commonly amplified at 52, divided into P by a distributor 153, and connected to receivers RX-1 to RX-P. In other words, the directivity is omnidirectional as in the conventional one (FIG. 1). Here, the gain of the receiving common amplifier 152 is the receiver RX
The input voltages to -1 to RX-P are set to be the same as the conventional one (FIG. 1). In the figure, data channel receivers 112-1 to 112-4, audio channel receivers 1061n to 106-4n, and the like are connected to the output terminals of the distributors 101-1 to 101-4.

FIG. 3 shows the internal configuration of the control section 150 shown in FIG. 2. As shown in FIG.

The demodulated outputs 107-1n to 107-4n, etc. of the voice channel receivers 106-1n to 106-4n, etc. are sent to the radio line control station via the communication path changeover switch 108 and the output communication path 109. .

On the other hand, audio channel receivers 106-1n to 106-4
The received channel command signal of n is sent from the channel command device 110 to the channel command signal input terminals 111-1n to 111-4.
Next, the line connection or data channel receiver will be described.

The demodulated outputs 113-1 to 113-4 of the data channel receivers 112-1 to 112-4 are added by an adder 114, and the data channel signal is decoded by a decoder 115.

Here, in the receivers 112-1 to 112-4, the amplitudes of the demodulated outputs 113-1 to 113-4 are limited approximately in proportion to the respective receiver input voltages. Therefore,
Since the output of the adder 114 is almost the maximum ratio combined output, no matter which antenna direction the radio waves sent from the mobile station are received, they can be decoded by the decoder 115 without switching the antenna direction. It becomes possible. In addition, the detection outputs 116-1 to 116-4 of the receiver input voltages of the data channel receivers 112-1 to 112-4 are detected by the maximum electric field detection unit 117.
The wireless zone with the maximum electric field and its electric field value are detected here.

After this information is processed by the processing section 118, only the reception level thereof is sent to the radio network control station via the signal line 119. At this time, the processing unit 118 detects and stores the 90-directional radio zone with the maximum electric field, and sends only its reception level to the radio network control station, and does not send information on the 900-directional radio zone. Among the above receivers, the data channel receiver receives and decodes both the radio waves sent out by the car phone radio and the radio waves sent out by the mobile phone radio, so it connects the lines used by both radios. A common wireless channel is used.

FIG. 4 is a diagram showing a configuration of a base station according to an embodiment of the present invention, which is different from that in FIG. 2.

In FIG. 4, various devices for diversity are added to the system shown in FIG. 2. That is, in addition to the antennas 1 to 1 to 1-4, the diversity antenna 10 is
2-1 to 102-4 are provided, and these output terminals HE, H
The outputs of N, Hs, and llw are input to receiving filters 103-1 to 103-4, respectively.

Furthermore, the output is transmitted to the receiving common amplifiers 104-1 to 104-10.
4-4, and after common amplification, the distributor 105-
It is distributed in M from 1 to 105-4. This distributor 105
-1 to 105-4 output terminals and distributors 101-1 to 10
1-4 output terminal and the audio channel diversity receiver 106! -1n to 1062-4n and data channel diversity receivers 112'-1 to 112'-4
is being input to the input terminal.

In FIG. 4, antennas 1-1 to 1-4 and diversity antennas 102-1 to 102-4 have almost the same directivity characteristics, and each antenna has a different polarization. is the vertically polarized wave, and the antenna 102-
If 1 to 102-4 are horizontally polarized waves, diversity receivers 106'-1n to 106'-4n and 1125-1 to
112'-4 is capable of polarization diversity operation, and therefore can obtain diversity gain. Diversity receiver 1065-1n ~ 106'' ~ 4n, 112
The outputs of '-1 to 112'-4 are connected to the control section 150. The control section 150 uses the one shown in FIG. 3 as in FIG. 2, and thereby performs the same operation as in FIG. 2.

Next, in an embodiment of the present invention, a procedure for connecting a mobile station (a car telephone radio or a mobile telephone radio) to a general telephone network will be explained with reference to FIG. FIG. 5 is a diagram showing an example of a wireless zone configuration. Focusing on the wireless zone 202 created by the base station 201 in the figure, the case where the mobile wireless telephone 205 transmits and the base station receives the wireless zone will be described. 202 is divided into four parts every 90 points to form 900 directional wireless zones 202-1 to 202-4.

That is, the 90 directional radio zone 202-1 is connected to the antenna 1-1 (FIG. 2) or the antennas 1-1 and 10.
2-1 (Figure 4) is the 900 directional radio zone 202-
2 is antenna 1-2 (Figure 2) or antenna 1-2
and 102-2 (Figure 4) have a 90-te directional radio zone. In radio zone 202-4, antenna 1-4 (FIG. 2) or antennas 1-4 and 102-4 each take charge of directivity. Note that the wireless zone 202 is not limited to four divisions, but can generally be divided into n 360 ZZ/n directional wireless zones.

In this case, it is necessary to install necessary facilities such as antennas as described above for each 360-/n directional radio zone. The mobile stations 205 and 206 transmit signals illustrated in FIG. 6 through wireless channels for line connection.

This signal is the preamble signal 301. Start signal 30
2, a control signal 303, and an information signal 304. In the present invention, the audio channel receives the radio waves transmitted from the mobile phone radio using an omnidirectional antenna in the horizontal plane, and receives the radio waves transmitted from the mobile phone radio with a lower transmission output. It is necessary to receive the radio waves with an antenna that has a 90-line directivity in the horizontal plane.

That is, it is necessary to change the directivity of the receiving antenna for each. Therefore, the 6th signal sent from the mobile device
For the signal shown in the figure, the code structure of the FO start signal 302 for transmission from a car phone radio is different from that for transmission from a mobile phone radio, or (mouth) start signal 30
The code structure of the control signal 303 following the start signal is made to be different between the two. If the method (a) is used, the base station receives the signal shown in FIG.
At the end of reception of 02, the control signal 303 is
The signal sent by the car phone radio at the end of reception,
It becomes possible to determine whether the signal is sent by a mobile phone radio. Since this signal is sent at the beginning of a mobile station attempting to start a call, the base station can determine the type of mobile station before starting a call. At the base station, this demodulated signal is sent to the adder 11
4, decoded by the decoder 115, and processed by the processing unit 1.
Reported on 18th. At the same time, the maximum electric field detection section 117 detects the zone of maximum electric field strength, and the results are reported. The processing unit 118 transmits the above contents to the radio network control station 2.
03 receives similar information reported from another base station (for example, base station 204 in FIG. 5), and first determines the type of mobile device.

Hereinafter, first, when the mobile device is a mobile phone radio 205, the radio network control station 203
, and instructs the processing unit 118 of the corresponding base station 201 to set a communication channel. Upon receiving this instruction, the processing unit 118 instructs the channel commander 110 of the receiver number and the channel number to be used for the 90 directional radio zones of the maximum electric field stored in advance, and also instructs the channel switching switch 108 to The demodulated output of the receiver of the used receiver number and a connection command for the communication line 109 are sent out. Furthermore, the radio network control station 203 determines the numbers to be used for the transmitters (TX-11 to TX-4N) and connects them. At the same time, the radio network control station 20
A downlink audio signal is sent from the downlink communication line 208 from the downlink communication line 208.

As described above, the communication route 207 between the mobile phone radio 205 and the radio network control station 203 for uplink audio signals (audio signals transmitted by the mobile station) and downlink audio signals (audio signals received by the mobile station) and 208 is set. At the same time, from the radio network control station 203 to the switching station 209, and then from the switching station 2
Since the line is connected from 09 to the general subscription telephone 210, it becomes possible to talk between the mobile phone radio 205 and the general subscription telephone 210. Next, a case where the mobile device is the car telephone radio 206 will be explained.

In this case, the radio network control station 203 selects the maximum field strength zone 202 and selects the base station 201 to which the zone belongs.
, receivers 0-1 to Niwa-P) and transmitters (TX-11 to
The number to be used for the TX-4N offshore is determined, and the connection between each outbound call line 207 and down call line 208 and the radio line control station 203 is established. At the same time, radio network control station 2
03 to the exchange 209 and from the exchange 209 to the general subscription telephone 210, it becomes possible to communicate between the car telephone radio station 206 and the general subscription telephone 210. In the above embodiment, when starting a call with a mobile phone radio,
If the base station memorizes which of the four 900 directional wireless zones received the strongest radio waves, that is, the 900 directional wireless zone with the maximum electric field, the base station will transmit the information of this 900 directional wireless zone to the radio. There is no need to send it to the line control station, and therefore the format of the control signal between the base station and the radio line control station can be the same as in the case of only the car telephone radio.

In the example explained above, one receiver is used as a data channel receiver for line connection.
977, ``Car Telephone Radio Line Control'' by Shukugawa et al., it is possible to use a similar configuration even if the line connection is divided into incoming and outgoing. Because the receiver of the data channel for line connection is constantly performing diversity, it takes too much gain from the signal sent out by the car phone radio, making it difficult to communicate with the car phone radio. Even if a line is set up, the call quality may not meet the standards. In order to avoid such a situation, diversity is suspended after the start signal 302 or control signal 303, which receives the line connection signal sent by the mobile radio and determines the type of mobile radio, as shown in Fig. 6. It is also possible to perform the method of The above is
Although we have shown a method of increasing sensitivity only on the uplink (transmission by mobile radio), it is possible to compensate for the lack of sensitivity in the downlink (transmission from base station) by having the mobile phone radio perform reception diversity.

As explained above, the present invention improves reception gain for mobile radio equipment with low transmission output by only partially changing the reception system of conventional base station equipment without making any changes to its transmission system. In addition, it is possible to maintain the reception gain for mobile radio equipment with high output power as before, so when mobile radio equipment with high transmission power and mobile radio equipment with low transmission power coexist, the base station This has the advantage of making it possible to utilize equipment effectively.

[Brief explanation of drawings]

FIG. 1 is a diagram showing a configuration example of a conventional base station radio equipment for a car phone, FIG. 2 is a diagram showing a configuration example of a base station radio equipment in an embodiment of the present invention, and FIG. 3 is a diagram showing a configuration example of a base station radio equipment of the present invention. FIG. 4 is a diagram showing a different configuration example of the base station radio equipment in the present invention, FIG. 5 is a diagram showing an example of the wireless zone configuration in the present invention, and FIG. 6 is a diagram showing an example of the configuration of the mobile station. FIG. 2 is a diagram illustrating an example of the configuration of a line connection signal sent out by the FIG. 1-1 to 1-4... Antenna, 2-1 to 2-4
...Hybrid, 3-1 to 3-4...
・Circulator, 4-1 to 4-4...Receiving filter 5-1 to 5-4...Receiving common amplifier, 6-1 to 6-4...・Reception distributor, RX-
11~RX-4N...Receiver, TX-11~T
X-4N...Transmitter, 7-11~7-4N...
...Cavity resonator, 81-8-4...Coupler,
9-1 to 9-4... Transmission filter 1, 10-
1 to 10-4... Circulator transmission terminal, VE, VN, VS, VW... Vertical polarization antenna output terminal, 101-1 to 101-4...・Distributor, 5564...Distributor output terminal, 151
...Combiner, 152...Reception common amplifier, 153...Distributor, RX-1 to RX-P
...Receiver, 102-1 to 102-4...
・・Diversity antenna, HE, HN, Hs, Hw
...Output terminal of diversity (horizontal polarization) antenna, 103-1 to 103-4...Reception filter 104-1 to 104-4...For reception Common amplifier, 105-1 to 105-4...Distributor, 10 to 1n to 106-4n...Audio channel receiver, 1065-1n to 106'-4n...・
・Diversity receiver for audio channel, 150...
...Control unit, 107-1n to 107-4n...
Demodulation output, 108... Call path switching Karatsuchi, 10
9... Call line, 110... Channel command device, 111-1n to 111-4n... Channel command signal input terminal, 112-1 to 112-4...
...Data channel receiver, 112'-1 to 112
2-4...Diversity receiver for data channel, 113-1 to 113-4...Demodulation output, 1
14...Adder, 115...Decoder,
116-1 to 116-4... Receiver input voltage detection output, 117... Maximum electric field detection section, 118
...Processing section, 119 ... Signal line, 20
1...Base station, 202...Radio zone, 202-1 to 202-4...900 directional radio zone, 301...Preamble signal, 30
2...Start signal, 303...Control signal, 304...Information signal, 203...
・Radio line control station, 204...Base station, 205
...Mobile phone radio, 206... Car phone radio, 207... Uplink call route, 208
...down line, 209...exchange, 210...general subscription telephone.

Claims (1)

[Claims] 1. In a communication system using a mobile radio line in which mobile radio devices with different transmission outputs coexist, the radio zone is spread over 360 degrees.
/n divided into n directional radio zones, and the base station is equipped with a directional antenna corresponding to each of the above directional radio zones,
After receiving the line connection signal transmitted from the mobile radio and detecting the type of mobile radio, the maximum reception output of the above directional antenna is applied to the radio waves transmitted from the mobile radio with low transmission output. The antenna is characterized in that it receives radio waves from mobile radios with high transmission output by mixing all of the reception outputs of the directional antennas and receiving them as omnidirectional. A mobile communication system. 2 For the modulated wave of the line connection signal transmitted from the mobile radio device, the demodulated output of the receiver connected to each directional antenna of the base station is added to the adder according to the electric field level of each receiver. 2. The mobile communication system according to claim 1, wherein the output of the adder is decoded after the addition in the adder. 3. In communication systems using mobile radio lines where mobile radios with different transmission outputs coexist, the radio zone is
Divided into /n directional wireless zones, the base station
A directional antenna corresponding to a 60°/n directional radio zone and a directional antenna for diversity reception having the same directionality corresponding to each of the above directional antennas are provided, and a line transmitted from a mobile radio device is provided. After receiving the connection signal and detecting the type of mobile radio, the above 360°/n
Diversity reception is performed using one of the directional antennas compatible with directional radio zones that is received with the maximum reception output and the corresponding co-directional diversity antenna, and the signal is transmitted from a mobile radio with a high transmission output. A mobile communication system characterized in that all received outputs of the directional antenna corresponding to the 360°/n directional radio zone are mixed and received as omnidirectional radio waves. 4 For the modulated wave of the line connection signal transmitted from the mobile radio device, the demodulated output of the receiver connected to each directional antenna of the base station is added to the adder according to the electric field level of each receiver. 4. The mobile communication system according to claim 3, wherein the output of the adder is decoded after the addition in the adder.