JPH04304058A - Radio repeater - Google Patents

Abstract

PURPOSE:To realize a relay station in which exchange processing between subordinate stations even when a line fault takes place between a relay station in a higher rank than a relevant relay station or a master station and the relevant relay station. CONSTITUTION:The repeater is provided with a reception input electric field detection circuit 308, a radio channel allocation control operation selection circuit 309 and a radio channel allocation control circuit 304 or the like to discriminate whether or not the communication between its own station and a relay station in a higher rank than its own station or a master station is interrupted. When the interrupt of communication is discriminated, a connection discrimination circuit 301 in its own subordinate station, a main signal demultiplexer circuit 303 and a main signal multiplexer circuit 305 or the like are provided in the repeater to implement the exchange processing between the subordinate relay station and the slave station.

Description

[Detailed description of the invention]

0001

[Field of Industrial Application] The present invention relates to a time division multiple access wireless communication system in which subscriber lines of a local exchange are expanded in multiple directions using multiple wireless channels, and in particular, the present invention relates to a time division multiple access type wireless communication system that extends subscriber lines of a local exchange in multiple directions using a plurality of wireless channels. The present invention relates to a wireless relay device.

0002

2. Description of the Related Art Conventionally, this type of time-division multiple access radio communication system, as shown in FIG.
A configuration is adopted in which they are connected to each other via 3b. A local exchange 2 is connected to the master station 1 and performs line exchange processing between the slave stations. Note that 5a to 5e are subscriber terminal devices connected to each slave station. In such a system, for example, the relay station 3b connects the slave stations 4c, 4
The received signal from the upper relay station 3a is transmitted as is to the upper relay station 3a, and the received signal from the upper relay station 3a is transmitted as is to the slave station 4.
The connection is made by sending to c and 4d. Further, the upper relay station 3a connects the slave station 4b to the master station 1. Slave station 4a
is directly connected to the master station 1. The line exchange process between each slave station is performed after transmitting the signal to the master station 1.
This is done in the local exchange 2 attached to the master station 1.

0003

[Problems to be Solved by the Invention] In the above-mentioned conventional time division multiple access wireless communication system, the relay station merely relays the wireless line, so it is difficult for the relay station to If a failure occurs that disconnects the wireless line between the station and the station, the signal will not reach the local exchange, even if the relay stations and slave stations below the own station's equipment are normal. , there is a problem that no exchange processing can be performed. An object of the present invention is to provide a relay station that enables exchange processing between lower-level stations even if a failure occurs in the line between the higher-level relay station or the master station.

0004

[Means for Solving the Problems] The wireless relay station of the present invention includes:
A means for determining whether or not communication between the own station and a higher-level relay station or a master station is disconnected; and a means for performing exchange processing with a lower-level relay station or slave station when communication is determined to be disconnected. Be prepared.

[0005]

[Operation] According to the present invention, when a failure occurs in the line on the upper side of the own station, the own station performs the process of exchanging the lines between the relay station and the slave station on the lower side, and communication between them is maintained. secure.

[0006]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, the present invention will be explained with reference to the drawings. FIG. 1 is a block diagram of an embodiment of a relay station of the present invention. In the figure, a relay station communicates with an upper relay station and a master station via an antenna 100 using a wireless transmission/reception circuit 101 on the upper station side. Furthermore, communication with lower-level relay stations and slave stations is performed via the lower-level station side wireless transmitting/receiving circuit 201 via the antenna 200.
It is configured to do this.

[0007] The calling party number detection circuit 300 detects the calling party's number from the uplink reception signal 10 transmitted from the lower relay station and slave station, and outputs the detection result to the own lower station connection determination circuit 301. Self-lower station connection determination circuit 3
01 indicates whether the slave station to which the destination terminal device is connected is a subordinate station of the own station that is the same as the slave station to which the calling terminal device is connected, according to the destination number output from the destination number detection circuit 300. The wireless channel allocation control circuit 304 outputs the determination result to the wireless channel allocation control circuit 304.

Wireless channel allocation request information detection circuit 302
detects wireless channel allocation request information from the uplink received signal 10 transmitted from the lower relay station and slave station, and outputs the detection result to the wireless channel allocation control circuit 304. Further, the main signal separation circuit 303 separates the main signal from the uplink reception signal 10 transmitted from the lower relay station and slave station, and outputs this main signal to the radio channel allocation control circuit 304.

The radio channel allocation control circuit 304 determines whether the determination result of the self-lower station connection determination circuit 301 indicates that the slave station to which the destination terminal device is connected is the same slave station to which the calling terminal is connected. , the main signal separated from the uplink received signal 10 by the main signal separation circuit 303 is transmitted to the wireless channel allocation request information detection circuit 302.
The radio channel is assigned to the communication route based on the detection result. The main signal multiplexing circuit 305 time-division multiplexes the main signal output from the radio channel allocation control circuit 304 into the downlink received signal 20 transmitted from the upper relay station and the master station.

[0010]Furthermore, when a call ends between the destination terminal device and the calling terminal device, the call end information detection circuit 306 detects the end of call information from the uplink reception signal 10 transmitted from the lower relay station and slave station. , and outputs the detection result to the self-lower-level intra-station connection release determination circuit 307 . The self-lower station internal connection release determination circuit 307 determines whether or not a call using the wireless channel allocated by the local station is terminated based on the output signal from the end-of-call information detection circuit, and determines whether or not the call using the wireless channel assigned by the local station is terminated. In the meantime, a request to release a wireless channel already allocated is output to the wireless channel allocation control circuit 304.

Furthermore, the reception input electric field detection circuit 308 detects the level of the reception input electric field of the downlink reception signal 20 transmitted from the upper relay station and the master station, and detects the level of the reception input electric field of the downlink reception signal 20 transmitted from the upper relay station and the master station, and A wireless channel allocation control operation selection circuit 309 determines whether communication with the master station is disconnected or not and sends the determination result to the wireless channel allocation control operation selection circuit 309
Output to. This wireless channel allocation control operation selection circuit 3
09 outputs a selection signal for determining whether or not to operate the wireless channel allocation control circuit 304 based on the output signal from the received input electric field detection circuit 308.

Next, the operation of the present invention will be explained using the time division multiple access wireless communication system shown in FIG. Now, suppose that the wireless line between the relay station 3a and the relay station 3b is disconnected due to a failure, and the subscriber terminal device 5c accommodated in the slave station 4c is connected to the subscriber terminal device 5d housed in the slave station 4d. An example is when making a phone call. The reception input electric field detection circuit 308 of the relay station 3b always receives the downlink reception signal 2 input from the upper station wireless transmission/reception circuit 101 via the antenna 100.
relay station 3a.
When the wireless line between the relay station 3b and the relay station 3b is disconnected due to a failure, an operation request signal from the wireless channel allocation control circuit 304 is output to the wireless channel allocation control operation selection circuit 309. Then, the wireless channel allocation control operation selection circuit 309 makes the wireless channel allocation control circuit 304 operational, and the relay station 3
It enables circuit switching in b.

[0013] When the relay station 3b is in a line-switchable state,
When the terminal 5c of the slave station 4c goes on-hook to make a call, the relay station 3b transmits the uplink reception signal 1 received through the slave station 4c.
The wireless channel allocation request information detection circuit 302 detects wireless channel allocation request information from 0 and outputs the detection result to the wireless channel allocation control circuit 304. On the other hand, the called party number is detected by the called party number detection circuit 300 from the uplink reception signal 10 similarly received through the slave station 4c,
The call destination number, which is the detection result, is output to the self-lower station internal connection determination circuit 301. Self-lower station connection determination circuit 30
1, the terminal 5 of the slave station 4d which is the destination of the communication is determined from the destination number inputted from the destination number detection circuit 300.
It is determined that d is a terminal device connected to a subordinate station of the own station, and the wireless channel allocation control circuit 304 uses the result detected by the wireless channel allocation request information detection circuit 302 to determine whether the terminal device 5c and the terminal 5d are connected to each other. outputs information to request allocation of a wireless channel as a communication path.

Then, the wireless channel allocation control circuit 304
Then, the main signal separated from the uplink received signal 10 by the main signal separation circuit 303 is assigned a radio channel as a communication path between the terminal 5c and the terminal 5d, and outputted to the main signal multiplexing circuit 305, where it is time-division multiplexed into the downlink received signal 20. and transmitted to the terminal 5d via the slave station 4d. As a result, a communication path between the terminal 5c and the terminal 5d is established without going through the local exchange 2,
A call is made.

Further, when the call between the terminal 5c and the terminal 5d ends, call end information is transmitted from the slave station 4c or slave station 4d, and the call end information detection circuit 306 detects the end call information from the upstream received signal 10. and outputs the detection result to the self-lower-level intra-station connection release determination circuit 307. The local lower station connection release determination circuit 307 determines that the call using the wireless channel allocated by the local station is terminated based on the detection result of call termination information, and outputs a wireless channel release request to the wireless channel allocation control circuit 304 . When a wireless channel release request is input, the wireless channel allocation control circuit 304 releases the wireless channel already allocated between the terminal 5c and the terminal 5d.

Therefore, in this example, even if there is a failure in the wireless line between relay station 3d and relay station 3a, or between relay station 3a and master station 1 located higher than the relay station, relay station 3b As a result, the exchange process is performed by slave station 4.
Connection between terminals 5c and 5d connected to terminals 5c and 4d, respectively, becomes possible. This ensures communication between terminals that are free of failures and eliminates damage to the entire wireless communication system.

[0017]

[Effects of the Invention] As explained above, the present invention provides a relay station with a means for determining whether communication between itself and a higher-order relay station or a master station is disconnected, and a means for exchanging between lower-order stations. This has the effect that even if a failure occurs in the upper line, the relay station can function as a switching station and perform switching processing for the lines between the lower relay station and slave stations. .

[Brief explanation of the drawing]

FIG. 1 is a block diagram of one embodiment of a relay station of the present invention.

FIG. 2 is a block diagram showing the configuration of a time division multiple access wireless communication system.

[Explanation of symbols]

1 Main station 2 Local exchanges 3a, 3b Relay stations 4a to 4d Slave stations 5a to 5e Subscriber terminal device 300 Call destination number detection circuit 301 Self-lower station internal connection determination circuit 302 Wireless channel allocation request information detection circuit 303
Main signal separation circuit 304 Radio channel allocation control circuit 305 Main signal multiplexing circuit 306 End of call information detection circuit 307 Self-lower station connection release determination circuit 308 Reception input electric field detection circuit

Claims (2)

[Claims] Claim 1: Consisting of one master station, a plurality of relay stations and slave stations, the master station is connected to a local exchange and communicates with the plurality of relay stations and slave stations using a plurality of wireless channels. The relay station communicates with a plurality of lower relay stations and slave stations using a plurality of wireless channels, and each of the slave stations is connected to one or more terminal devices. In the relay station, the relay station includes a means for determining whether or not communication between the own station and a higher-level relay station or a master station is disconnected, and a means for determining whether communication between the own station and a higher-level relay station or a master station is disconnected, and a means for determining whether communication is disconnected between the relay station and a lower-level relay station or a slave station when communication is determined to be disconnected. 1. A wireless relay device comprising: means for performing an exchange process. 2. The relay station includes means for detecting the number of the called party from uplink reception signals transmitted from the lower relay station and the slave station when a terminal device connected to the slave station makes a call; Based on the result of detecting the number of the called party, it is determined whether the slave station to which the called party's terminal device is connected is connected to the same subordinate station as the slave station to which the calling terminal device is connected. means for detecting radio channel allocation request information from uplink reception signals transmitted from the lower relay station and slave station; and separating a main signal from the uplink reception signal transmitted from the lower relay station and slave station. means for assigning the output signal of the main signal separation means to the wireless channel assignment when it is determined that the destination terminal device and the calling terminal device are connected to the same subordinate station of the own station; means for allocating request information to a wireless channel communication path based on a result of detecting the request information; means for time-division multiplexing a main signal outputted from the allocating means into a downlink received signal; and the communication destination terminal device and the calling terminal device. means for detecting call end information from uplink reception signals transmitted from the lower relay station and the slave station, and detecting the wireless channel assigned by the own station from the result of detecting the call end information when a call end occurs between It is determined whether the end of call information is between the terminals in use, and if the end of call information detection result is a wireless channel allocated by the own station, it is determined whether the end of call information is already allocated between the terminal device at the other end of the call and the calling terminal device. means for releasing the radio channel that is being transmitted, and detecting the level of the received input electric field of the downlink received signal transmitted from the master station and relay station connected to the upper layer, and detecting the level of the received input electric field of the received input electric field level, Means for determining whether communication between a station and a master station and a relay station connected to an upper level is disconnected; 2. The wireless relay device according to claim 1, further comprising means for selecting whether or not to perform the means for allocating.