JPH07120975B2 - Wireless communication system - Google Patents

Description

Detailed Description of the Invention [Industrial applications]

The present invention relates to a wireless communication system that simultaneously transmits the same communication information from one wireless terminal device to a plurality of other wireless terminal devices via a wireless relay device.

2. Description of the Related Art FIG. 3 is a block diagram showing a conventional wireless communication system.
In the figure, reference numeral 1 is a plurality of wireless terminal devices that transmit and receive communication information by radio waves. Reference numeral 2 is a transmitter of the wireless terminal device 1 that modulates and transmits communication information, and reference numeral 3 is a receiver of the wireless terminal device 1 that demodulates the received communication information. Reference numeral 4 is a relay wireless device that transmits and receives radio waves to and from the wireless terminal device 1 to relay communication information. Reference numeral 5 is a receiver of the relay wireless device 4 that demodulates the received radio wave, and 6 is a transmitter of the relay wireless device 4 that modulates the communication information to be transmitted.
Reference numeral 7 denotes a carrier detection / carrier significant transmission unit that determines whether or not the reception unit 5 is receiving a radio wave from the wireless terminal device 1. 8 is connected to a plurality of relay wireless devices 4 by an upward communication path a, a downward communication path b and a carrier significant signal path c,
It is a communication control device that transmits communication information relayed by the relay wireless device 4 that has been transmitted first to a plurality of other wireless terminal devices 1. Reference numeral 9 is a carrier for judging the carrier significant signal sent from the carrier detection / carrier significant sending unit 7 of each wireless relay device 4 on the carrier significant signal path c, and for determining the wireless relay device 4 which has the earliest transmission. It is a significant signal pre-take determination unit. Reference numeral 10 denotes the wireless relay device 4 that has the earliest transmission in the call information received via the upstream communication path a based on the determination result of the carrier significant signal preemption determination unit 9.
Is a call path selecting unit for selecting the one from the above, and 11 sends out the call information selected by the call path selecting unit 10 to the transmitting unit of the predetermined wireless relay device 4 via the downlink call path b. It is a channel distribution unit. Next, the operation will be described. The radio wave transmitted from the wireless terminal device 1 is received by the relay wireless device 4, and its communication information is sent to the communication control device 8 via the upward communication path a. Further, when the carrier detecting / carrier significant sending unit 7 in the wireless relay device 4 detects that the receiving unit 5 has received the radio wave, it generates a carrier significant signal and sends it to the carrier significant signal path c for communication control. Notify device 8 of this. The communication information sent from the plurality of relay wireless devices 4 via the upward call path a is sent to the call path selection unit 10 in the communication control device 8. In addition, each relay wireless device 4
The carrier significant signal sent from the carrier significant signal path c from the carrier significant signal is sent to the carrier significant signal pre-take determination unit 9 in the communication control device 8. The carrier-significant signal pre-take determination unit 9 determines the upstream call path a in which the carrier-significant signal was earliest in time, and sends a call path selection signal for notifying it to the call path selection unit 10. Based on the call path selection signal, the call path selection unit 10 selects the up talk path a in which the carrier significant signal is earliest in time, and connects it to the call path distribution unit 11. The call path distribution unit 11 sends the communication information from the connected call path a to the downlink call path c and sends it to a predetermined wireless terminal device via each relay wireless device 4.

Since the conventional wireless communication system is configured as described above, when performing 1: n wireless communication control, the uplink and downlink communication paths a and b for transmitting communication information are provided. In addition to the above, there is a problem that the carrier significant signal path c for transmitting the carrier significant signal becomes indispensable. The inventions set forth in claims (1) and (2) have been made to solve the above problems, and a 1: n wireless communication control is performed by a special signal path for transmitting a carrier significant signal. It is an object of the present invention to obtain a wireless communication system that can be realized without requiring.

[Means for Solving the Problems]

A wireless communication system according to the invention of claim (1),
The wireless terminal device has a signal generation unit that generates a specific signal to be added to the beginning of the communication information to be transmitted, detects the specific signal from the communication control device and each relay wireless device, and determines which relay wireless device the It is provided with a determination unit for determining whether there was a previous transmission. Further, in the wireless communication system according to the invention described in claim (2), the relay wireless device detects reception of communication information from the wireless terminal device and generates a specific signal to be added to the head of the received communication information. In addition to having a reception detection / signal generation unit, the communication control device has a determination unit that detects the specific signal from each relay wireless device and determines which relay wireless device has made the earliest transmission. It is a thing.

[Work]

The communication control device in the invention according to claim (1) detects the specific signal generated by the signal generation unit of each wireless terminal device and added to the beginning of the communication information, and determines which relay wireless device is the earliest. Whether or not there is a transmission is determined by an internal determination unit, and based on the determination result, the communication information relayed by the relay wireless device that has the earliest transmission is transmitted to a plurality of other wireless terminal devices. A wireless communication system that does not require a special signal path for transmitting a carrier significant signal is realized. Further, in the communication control device according to the invention described in claim (2), the reception detection / signal generation unit of each relay wireless device detects a specific signal added to the beginning when receiving the communication information, and which relay wireless device The internal determination unit determines whether there is the earliest transmission, and based on the determination result, the communication information relayed by the relay wireless device that has the earliest transmission is addressed to a plurality of other wireless terminal devices. By transmitting, a wireless communication system that does not require a special signal path for transmitting a carrier significant signal is realized.

【Example】

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a block diagram showing an embodiment of the invention described in claim (1). In the figure, 1 is a wireless terminal device, 2 and 6 are transmitting units, 3 and 5 are receiving units, 4 is a relay wireless device, 8 is a communication control device, 10 is a speech path selecting unit, 11 is a speech path distributing unit, a ,
Reference numerals b are uplink and downlink communication paths, which are the same as or equivalent to those of the conventional one denoted by the same reference numerals in FIG. 3, and therefore detailed description thereof will be omitted. Reference numeral 12 is arranged in the wireless terminal device 1 and has a strong autocorrelation that can be surely determined even if it is sent in a burst at the beginning of the communication information transmitted from the transmission unit 2, for example, a barker code,
It is a unique word generation unit as a signal generation unit for adding a specific signal (hereinafter referred to as a unique word) based on a pseudo noise code or the like. 13 detects the unique word sent from each relay wireless device 4, determines which relay wireless device 4 has transmitted the earliest, and uses the result of the determination as the communication route selection signal. It is a unique word detection / preemption determination unit as a determination unit to be sent to. Next, the operation will be described. From a wireless terminal device 1:
When n communication is performed, the unique word generated by the unique word generating unit 12 is added to the beginning of the communication information to be transmitted. The communication information in which the unique word is added to the head is sent to the communication path selection unit 10 and the unique word detection / preemption determination unit 13 of the communication control device 8 via the relay wireless device 4 and the upstream communication path a. The unique word detection / preemption judging unit 13 detects the unique word sent from each relay wireless device 4 and judges the speech path a sent earliest in time. The result of this determination is sent to the speech path selection unit 10 as a speech path selection signal. The call path selecting unit 10 selects the up call path a based on the call path selection signal. That is, in the communication information sent from each wireless terminal device 1, the upstream communication path a which transmits the communication information that arrives at the communication control device 8 earliest in time is selected and connected to the communication path distribution unit 11. It The communication path distribution unit 11 distributes the communication information input on the upstream communication path a to each downstream communication path b so as to be transmitted to the transmission unit 6 of each relay wireless device 4. The transmitting unit 6 of each relay wireless device 4 modulates the communication information that has been sent, and sends it to the receiving unit 3 of the predetermined wireless terminal device 1 by wireless. By this 1:
n communication is realized. FIG. 2 is a diagram showing an embodiment of the invention described in claim (2), and the same parts as those in FIG. 1 are designated by the same reference numerals to avoid redundant description. In the figure, 14 is arranged in the relay wireless device 4 and detects reception of communication information from the wireless terminal device 1 and generates a unique word which is a specific signal added to the head of the received communication information. It is a carrier detection / unique word generation unit as a signal generation unit. 15
Is a switching unit for switching between the unique word generated by the carrier detecting / unique word generating unit 14 and the call information received and demodulated by the receiving unit 5, and adding the unique word to the head of the communication information. Next, the operation will be described. Receiver 5 of relay wireless device 4
Receives the modulated communication information from the wireless terminal device 1 by radio wave, and sends the carrier level to the carrier detection / unique word generation unit 14. In the carrier detection / unique word generation unit 14, if the sent carrier level is equal to or higher than a predetermined threshold level, it is determined that there is a carrier, a unique word is generated and sent to the switching unit 15. The switching unit 15 adds the received unique word to the beginning of the communication information received and demodulated by the receiving unit 5, and sends the unique information to the communication control device 8 via the upstream communication path a. The communication control device 8 operates in the same manner as in the case of the embodiment of the invention described in claim (1) shown in FIG. 1 and realizes 1: n communication.

【The invention's effect】

As described above, according to the invention described in claim (1), each wireless terminal device adds a specific signal to the beginning of the communication information and transmits the communication information, and the communication control device detects which relay wireless communication by detecting the specific signal. Determine if there was the earliest transmission from the device,
Since it is configured to send the communication information relayed by the relay wireless device that had the earliest transmission to a plurality of other wireless terminal devices, a special call for notifying the communication control device of the presence or absence of a carrier There is an effect that a wireless communication system capable of performing preemptive priority control at low cost can be obtained by eliminating the need for a path. Further, according to the invention described in claim (2), when the relay wireless device receives the communication information from the wireless terminal device, the relay wireless device adds a specific signal to its head and sends it to the communication control device. It is determined which relay wireless device has made the earliest transmission by detecting the signal, and the communication information relayed by the relay wireless device having the earliest transmission is transmitted to a plurality of other wireless terminal devices. With this configuration, there is no need for a special communication path for notifying the communication control device of the presence or absence of a carrier, and there is an effect that a wireless communication system capable of performing preemptive priority control at low cost can be obtained.

[Brief description of drawings]

FIG. 1 is a block diagram showing a wireless communication system according to an embodiment of the invention described in claim (1), and FIG. 2 is a block diagram showing an embodiment of the invention described in claim (2). FIG. 1 is a block diagram showing a conventional wireless communication system. 1 is a wireless terminal device, 4 is a relay wireless device, 8 is a communication control device, 12 is a signal generation unit (unique word generation unit), 13 is a determination unit (unique word detection / preemption determination unit), and 14 is reception detection / signal. Generator (carrier detection / unique word generator), a and b are communication paths. In the drawings, the same reference numerals indicate the same or corresponding parts.

Claims (2)

[Claims] 1. A plurality of wireless terminal devices having a signal generation unit for transmitting and receiving communication information by radio waves and generating a specific signal to be added to the beginning of the communication information to be transmitted, and transmitting and receiving the radio waves with the wireless terminal devices. And a relay wireless device that relays the communication information together with the specific signal and a plurality of the relay wireless devices connected by a communication path, and detects the specific signal from each of the relay wireless devices to determine which relay wireless device A determination unit that determines whether there is the earliest transmission from the device, and transmits the communication information relayed by the relay wireless device that has transmitted the earliest transmission to a plurality of other wireless terminal devices. A wireless communication system including a communication control device. 2. A plurality of wireless terminal devices that transmit and receive communication information by radio waves, and relay the communication information by transmitting and receiving the radio waves to and from the wireless terminal device, and receiving the communication information from the wireless terminal device. And a relay wireless device having a reception detection / signal generation unit that generates a specific signal to be added to the beginning of the received communication information, and a plurality of the relay wireless devices connected by a communication path, and each of the relay wireless devices. From the relay wireless device that detects the specific signal from the relay wireless device that determines the earliest transmission from the relay wireless device that transmitted the earliest transmission. A wireless communication system comprising: a communication control device that transmits to another plurality of the wireless terminal devices.