JPH0488732A - Burst signal relay system for multi-direction multiplex communication system - Google Patents

Abstract

PURPOSE:To prevent relay of an erroneous burst signal or implementation of relay of the burst signal by sending data communication time slot information from a master station to a relay station. CONSTITUTION:When a data signal burst to be relayed is in existence in a relay station based on information from a master station, a selection signal goes to a high level corresponding to a radio time slot and an incoming relay byrst signal S1 is selected. On the other hand, a path of a relay station not relating to the data signal transmission goes to a low level corresponding to the data signal time slot and the relay station is controlled so as not to send the burst signal to a host station. Thus, the burst is stably relayed to the relevant data signal time slot to a relay station relating to the relay of a data communication signal and the transmission of the burst to the data signal time slot is inhibited to a relay station independently of the data communication signal.

Description

[Detailed Description of the Invention] [Field of Industrial Application] The present invention provides a demand assignment method in which a wireless communication channel is allocated between a slave station or relay station and a master station only when a call occurs to the slave station or relay station. The present invention relates to a multidirectional multiplex communication system in which communications are controlled by a network, and in particular to a method of relaying an upper reversal signal from a lower station to an upper station when both telephone communication and data communication are handled together.

[Conventional technology]

In general, a multidirectional multiplex communication system is a time division multiplex wireless communication system that performs 1:N communication between one master station and a plurality of geographically isolated slave stations surrounding the master station. Depending on the system scale, one or more relay stations may be installed in the system, and the relay station itself also communicates with the master station.

In such a multidirectional multiplex communication system, a time division multiplexing (TDM) method is used to transmit downstream communication information from the master station to each slave station. , and each slave station separates, selects and retrieves the communication information targeted by itself.On the other hand, each slave station transmits communication information in the upstream direction from each slave station to the master station. Time division multiple access (TDMA) transmits a transmission burst signal (burst signal with intermittent transmission time) only within a predetermined transmission time range (hereinafter referred to as radio time slot) assigned to the local station. ) method is used to transmit predetermined communication information to the master station, and the master station separates and extracts the communication information from each slave station, thereby performing two-way communication.

FIG. 2 shows an example of the configuration of this type of multidirectional multiple communication system, where A is a master station, 81 to B4 are a plurality of slave stations, and C is a relay station. Among these slave stations, a system example is shown in which slave stations B3 and B4 are wirelessly connected to the master station A via the relay station C, and other slave stations Bl and B2 are directly wirelessly connected to the master station A. There is.

FIG. 3 is a radio frame configuration diagram, showing the downlink frame configuration from the master station to each slave station and the uplink frame configuration from each slave station to the master station.

Next, a method of relaying uplink burst signals from a lower station to an upper station in such a multi-way multiplex communication system will be described.

FIG. 4 shows the configuration of a relay station in a conventional multidirectional multiplex communication system. 1 is an antenna for the master station (upper station), 2 is an antenna for the slave station (lower station), and the receiver 5.6 and transmitter 7.8 are connected via circulators 3 and 4, respectively. There is. Reference numeral 9 denotes a time division multiplex signal processing circuit to which these receivers and transmitters are connected, and a telephone 11 and data terminal 12 are connected via an interface circuit 10. This time division multiplexed signal processing circuit 9 includes a frame synchronization circuit 13. Transmission timing generation circuit 14, uplink burst signal detection circuit 159 selection circuit 16, insertion burst signal detection circuit 17. And an electric charger 18 is provided.

In this relay station, the frame synchronization circuit 13 obtains a frame synchronization signal dependent on the received signal from the master station demodulated by the receiver 5, and further, based on this signal, the transmission timing generation circuit 14 generates a transmission timing signal. is generated.

On the other hand, the uplink burst signal from the lower station is demodulated by the receiver 6 to obtain the uplink relay burst signal S1, which is guided to the selection circuit 16. Further, a telephone set 11 and a data terminal 12 are connected to the subscriber line from the interface circuit 10.
The insertion burst signal S2 of the own station corresponding to the selection circuit 16
guided by.

Next, the uplink burst signal detection circuit 15 leads the selection signal S3 to the selection circuit 16 corresponding to the radio time slot to be relayed. Here, under the control of the selection circuit 16, when an uplink relay burst signal exists, the selection signal S3 becomes high level corresponding to the radio time slot, and the uplink relay burst signal is selected. Conversely, when there is no uplink relay burst signal, the selection signal S3 becomes low level,
The call processing burst signal of the local station is selected. Furthermore, the uplink relay burst signal selection signal S3 and the insertion burst signal S
2, the transmitter 8 is controlled by the burst control signal S4.

In this way, the relay station relays the uplink burst signal coming from the lower station to the upper station, and also sends the call processing burst signal to the master station, which occurs at the relay station when the relay station does not have this relay signal, to the upper station.

[Problems to be Solved by the Invention] However, in the conventional multi-directional multiplex communication system, the relay station determines the presence or absence of an uplink burst signal arriving from a lower station, and only when an uplink burst signal is detected.
Since this burst signal is sent to the upper station, if fading of the wireless line occurs and the input electric field of the received signal falls below a threshold level, the relay of the data communication signal is cut off. Additionally, if interference waves are input to a relay station that is unrelated to the data communication signal route, this relay station will incorrectly judge the signal as an interference wave and send a burst signal unrelated to the data communication signal to the upper station. Because of the transmission, it will collide with a burst of data communication signals. Moreover, the unrelated burst signals generated from this interfering wave are converted by the relay station to the same level as the desired wave (data communication signal), thereby interfering with the desired wave.

SUMMARY OF THE INVENTION An object of the present invention is to provide a burst signal relay method for a multidirectional multiplex communication system that performs a stable data communication signal relay operation.

[Means for Solving the Problems] The burst signal relay method of the multidirectional multiplex communication system of the present invention is such that when relaying a data communication signal, the data communication signal is relayed from a lower station to an upper station under control from a master station in advance. The data communication time slot information to be relayed is transmitted to the relay station corresponding to the route, and the relay station performs a data signal relay operation based on this data communication time slot information.

[Operation] According to the present invention, by transmitting time slot information for data communication from the master station to the relay station in advance, it is possible to prevent burst signals from being relayed or to prevent erroneous burst signal relay operations.

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

FIG. 1 is a block diagram of a relay station in a multidirectional multiplex communication system according to the present invention, and the same parts as in the conventional system are given the same reference numerals and their explanation will be omitted. That is, in addition to the configuration shown in FIG. 4, the time division multiplexed signal processing circuit 9 includes a data signal burst signal timing information detection circuit 19 and a memory 2.
0, station number 21, and data signal burst control circuit 22
and an adder 23.

According to this relay station, the frame synchronization circuit 13 obtains a frame synchronization signal that is dependent on the received signal from the master station demodulated by the receiver 5, and the transmission timing generation circuit 14 uses this signal as a reference. A transmit timing signal is generated. Further, the data signal burst relay timing information to be relayed corresponding to the station number 21 of this relay station is detected from the received signal from the master station by the data signal burst relay timing information detection circuit 19, and the information is stored in the memory 2°. .

On the other hand, the uplink burst signal from the lower station is demodulated by the receiver 6 to obtain the uplink relay burst signal S1, which is guided to the selection circuit 16. Further, from the interface circuit 10, insertion burst signals S2 of the own station corresponding to the telephone set 11 and the data terminal 12 connected to the subscriber line are led to the selection circuit 16. Further, the data signal burst control circuit 22 generates a data signal burst control signal based on the time slot information of the data signal to be relayed taken out from the memory 20, and generates a data signal burst control signal in the uplink burst signal detection circuit 15.
is added to a detection signal S3 indicating the presence of an uplink relay burst signal corresponding to the radio time slot to be relayed in an adder 23, thereby controlling a selection circuit 16.

Here, to explain the control of the selection circuit 16, if there is a data signal burst to be relayed at the relay station based on information from the master station, the selection signal becomes high level corresponding to that wireless time slot, and the upstream Relay burst signal S1
is selected. On the other hand, relay stations belonging to different routes unrelated to data signal transmission are controlled to go low in response to this data signal time slot and not to send burst signals to higher-level stations.

Therefore, in this relay station, under control from the master station,
For relay stations involved in relaying data communication signals, bursts are stably relayed in the corresponding data signal time slots, and for relay stations unrelated to data communication signals, bursts are transmitted in data signal time slots. It is prohibited to do so.

〔Effect of the invention〕

As explained above, the present invention transmits time slot information for data communication from the master station to the relay station in advance, and relays based on this time slot information.
For data communication, which requires stricter line quality than telephone communication, even if fading or interference occurs in the wireless line, relay stations may not relay burst signals or send burst signals incorrectly. This has the effect of preventing burst collisions caused by collisions and stably relaying data signals.

[Brief explanation of drawings]

Fig. 1 is a block diagram of a relay station in the multi-directional multiplex communication system of the present invention, Fig. 2 is a block diagram of the multi-directional multiplex communication system, Fig. 3 is a radio frame block diagram, and Fig. 4 is a block diagram of a conventional relay station. FIG. 1.2... Antenna, 3.4... Circulator,
5, 6...Receiver, 7.8...Transmitter, 9...Time division multiplex signal processing circuit, 10...Interface circuit, 11...Telephone, 12...Data terminal, 13・
... Frame synchronization circuit, 14... Transmission timing generation circuit, 15... Upper reversal signal detection circuit, 16...
- Selection circuit, 17... Insertion burst signal detection circuit, 1
8... Adder, 19... Data signal burst relay timing information detection circuit, 20... Memory, 21...
Station number, 22...Data signal burst control circuit, 23
...Adder, A...Master station, B1-B4...Slave station,
C...Relay station. 2nd 3rd 41-Kyo F “Mouth”

Claims (1)

[Claims] 1. Communication control is performed using a demand assignment method that allocates a wireless communication channel between the slave station or relay station and the master station only when a call occurs to the slave station or relay station, and handles both telephone communication and data communication. In a method of relaying uplink burst signals from a lower station to an upper station in a multi-directional multiplex communication system, data communication signals are relayed by changing the route from the lower station to the upper station under control from the master station before communication. A multidirectional multiplex communication system characterized in that time slot information for data communication to be relayed is transmitted to a relay station corresponding to the relay station, and the relay station performs a relay operation of a data signal based on this time slot information for data communication. burst signal relay method.