JPH0447815A - Signal repeating system for multidirectional multiplex communication - Google Patents

Abstract

PURPOSE:To uniform the service grade of a system as a whole by providing a circuit to compare the time of generating an incoming repetition burst signal with the time of generating a self-call processing burst signal. CONSTITUTION:When an ascending repetition burst signal 55 is generated earlier than a call processing burst signal 56 at an arbitrary radio time slot(RT), in the control of a selecting circuit 54, a select signal is turned to H corresponding to the RT and the incoming repetition burst signal 55 is selected. Reversely, when the self-call processing burst signal 56 is generated earlier than the ascending repetition burst signal 55, the select signal is turned to L corresponding to the RT, and the self-call processing burst signal is selected. Further, when the incoming repetition burst signal 55 and the call processing burst signal 56 at the same time, it is controlled for the select signal to hold the state of the select signal corresponding to the RT of the preceding cycle.

Description

[Detailed Description of the Invention] [Field of Industrial Application] The present invention relates to a signal relay system for multi-directional multiplex communication, and in particular, when a call occurs to a slave station or relay station, the relay station transmits a signal from a lower station to an upper station. This invention relates to a signal relay system for multidirectional multiplex communication when selecting uplink burst signals.

[Conventional technology]

Normally, a multidirectional multiplex communication system, as shown in the system configuration diagram of FIG. A time division multiplexing wireless communication system that performs N communications,
Depending on the system scale, one or more relay stations 2
The slave stations 23C and 23D are wirelessly connected via the relay station 2, and the relay station itself also communicates with the master station. FIG. 3 is an explanatory diagram of the radio frame structure, showing the downlink frame structure from the master station to each child station and the uplink frame structure from each child station to the master station. That is, for transmitting communication information in the downstream direction from the master station to each slave station, time slots TSI to TSm are assigned to each slave station using a time division multiplexing method, and predetermined communication information is transmitted. Each slave station separates, selects and extracts the communication information that is its own target. On the other hand, for transmission of communication information in the upstream direction from each slave station to the master station, each slave station uses a predetermined transmission time range (
The master station transmits predetermined communication information from each slave station using a time division multiple access method that sends intermittent transmission burst signals only within TSI to TSm (hereinafter referred to as wireless time slots). Two-way communication is performed by separating and extracting the communication information.

Next, we will discuss the relay method of uplink burst signals from lower-level stations to upper-level stations in the conventional multidirectional multiplex communication system.
This will be explained using figures. Figure 4 shows the configuration of the relay station, including an antenna 3, receivers 4, 8,
A time division multiplex signal processing circuit 5, a transmitter 6.10, an antenna 7 for a slave station which is a lower station, an interface circuit 9,
It consists of subscriber lines 11. Here, the configuration and operation of the time division multiplexing circuit 5 will be explained. Frame synchronization circuit 5
1, a frame synchronization signal dependent on the received signal from the master station demodulated by the receiver 4 is obtained, and furthermore, a transmission timing signal is generated by the transmission timing generation circuit 52 using this signal as a reference. On the other hand, the uplink burst signal from the lower station is demodulated by the receiver 8 to obtain the uplink relay burst signal 55, which is guided to the selection circuit 54, and from the interface circuit 9 to the own station corresponding to the subscriber line 11. call processing burst signal 56 is directed to selection circuit 54. Furthermore, the selection signal 57 corresponding to the radio time slot to be relayed is guided by the uplink burst signal detection circuit 53 to the selection circuit 54. Here, under the control of the selection circuit 54, when an uplink relay burst signal exists, the selection signal 57 becomes a "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 57 becomes "low" level, and the call processing burst signal of the own station is selected.

In this way, the relay station relays the upstream burst signal coming from the lower station to the upper station, and also sends the call processing burst signal to the master station that occurs at the relay station when there is no relay signal to the upper station. It was working like this. When considering call processing, the master station notifies all slave stations and relay stations of information about currently vacant wireless time slots using a call time slot allocation signal. At stations and relay stations, when a call is made from a subscriber line,
A call processing burst signal is sent to the master station using the radio time slot notified by the master station. At this time, the relay station sends the call processing signal coming from the lower station to the higher station with priority over the call processing signal of its own station, so that the relay station relaying the signal coming from the lower station can simultaneously communicate with the same radio station. When processing a call using a time slot, processing by a lower station takes priority. That is, since the service grade of the entire system improves as it goes to lower stations, there will be deviations depending on the station (subscriber).

[Problem to be solved by the invention]

In the relay station of the conventional multidirectional multiplex communication system described above, the uplink burst signal coming from the lower station is sent to the upper station with priority, so when a call processing signal to the master station occurs at the relay station, the radio used by the relay station is When the time slot matches the radio time slot of the uplink relay burst signal from the lower station,
The disadvantage is that the call processing burst signal inserted from the own station is always crushed and placed in a waiting state.

The purpose of the present invention is to provide a signal relay system for multi-directional multiplex communication that can make the service grade of the entire system uniform by using a circuit that can process calls inserted from the local station with priority given to waiting states. be.

[Means to solve the problem]

The multidirectional multiplex communication signal relay system of the present invention is a demand assignment multidirectional multiplex communication system that allocates wireless communication channels between a master station and a plurality of slave stations or relay stations. In a signal relay system for multi-directional multiplex communication that relays burst signals, the relay station performs the following for each time slot of each wireless communication channel:
The occurrence times of the uplink relay burst signal from the lower station and the call processing burst signal inserted by the relay station are compared, and one of the two burst signals is sent to the upper station with priority given to the first one.

〔Example〕

Next, the present invention will be explained with reference to the drawings. FIG. 1 is a block diagram of a relay station according to an embodiment of the present invention, which has the same configuration as the conventional example except that the internal configuration of the 0 time division multiplex signal processing circuit 5A is different from the conventional example. Here, the configuration and operation of the time division multiplexed signal processing circuit 5A will be explained. Frame synchronization circuit 5
1, a frame synchronization signal dependent on the received signal from the master station demodulated by the receiver 4 is obtained, and furthermore, a transmission timing signal is generated by the transmission timing generation circuit 52 using this signal as a reference. On the other hand, the uplink burst signal from the lower station is demodulated by the receiver 8 to obtain the uplink relay burst signal 55, which is guided to the selection circuit 54, and from the interface circuit 9 to the call processing corresponding to the subscriber line 11. Burst signal 56 is directed to selection circuit 54. Further, a detection signal 57A indicating the presence of an uplink relay burst signal corresponding to the radio time slot to be relayed from the upper burst signal detection circuit 53 and a call processing burst signal from the call processing signal detection circuit 2 added in this embodiment are detected. The detection signal 2A indicating 0 is guided to the individual time slot burst signal occurrence time comparison circuit 1 added in this embodiment.In the individual time slot burst signal occurrence time comparison circuit 1, two The generation times of the signals are compared and the selection circuit 54 is controlled based on this result.

The selection circuit 54 controls whether the uplink relay burst signal 55 is selected as the call processing burst signal 56 in any wireless time slot.
When the signal occurs earlier in time than the radio time slot, the selection signal becomes a "high" level corresponding to that radio time slot, and the uplink relay burst signal 55 is selected. Conversely, when the call processing burst signal 56 of the own station occurs earlier in time than the uplink relay burst signal 55, the selection signal becomes a "low" level corresponding to that radio time slot, and the call processing burst signal of the own station occurs earlier than the uplink relay burst signal 55. The signal is selected and Z. Further, when the uplink relay burst signal 55 and the call processing burst signal 56 occur at the same time, the selection signal is controlled to maintain the state of the selection signal corresponding to the radio time slot of the previous period. That is, in the present invention, the relay station compares the occurrence times of the uplink relay burst signal coming from the lower station and the call processing burst signal inserted from the own station for each radio time slot individually, and transmits one burst signal with priority to the first. Since it is sent to the upper station, there is no priority given to unilateral uplink burst signals.

〔Effect of the invention〕

As explained above, by providing a circuit that compares the occurrence times of uplink relay burst signals and own call processing burst signals, the present invention can process calls for all stations (subscribers) on a first-come, first-served basis. This has the effect of making the service grade of the entire system uniform.

[Brief explanation of drawings]

Fig. 1 is a block diagram of an embodiment of the present invention, Fig. 2 is a block diagram of a general multi-directional multiplex communication system, Fig. 3 is an explanatory diagram of a general radio frame structure, and Fig. 4 is a diagram of a conventional radio frame structure. FIG. 2 is a configuration diagram of a signal relay system for multi-directional multiplex communication. DESCRIPTION OF SYMBOLS 1... Individual time slot/burst signal occurrence time comparison circuit, 2... Call processing signal detection circuit, 3.7... Antenna, 4.8... Receiver, 5A, 5... Time division Multiple signal processing circuit, 6.10... Transmitter, 9... Interface circuit, 11... Subscriber line, 51...
- Frame synchronization circuit, 52... Transmission timing generation circuit, 53... Uplink burst signal detection circuit, 54...
selection circuit.

Claims (1)

[Claims] A multidirectional multiplex communication signal that relays uplink burst signals from a lower station to an upper station in a demand assignment multidirectional multiplex communication system that allocates wireless communication channels between a master station and multiple slave stations or relay stations. In the relay method, the relay station compares the occurrence times of the uplink relay burst signal from the lower station and the call processing burst signal inserted from the relay station for each time slot of each wireless communication channel, and selects the uplink relay burst signal from the lower station on a first-come, first-served basis. A signal relay system for multidirectional multiplex communication characterized by sending one of two burst signals to a higher-level station.