JP2000069546A - Subscriber's radio communication system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To efficiently assign communication channels to subscriber's stations by storing information indicating the presence or absence of the assignment of communication channels in a base station by making this information correspond to each subscriber's station, and allowing the base station to transmit a polling signal through a control channel, and allowing the subscriber's station to request the assignment of the communication channel only at the time of receiving the polling signal. SOLUTION: A controller 20 reads the first data area of the memory content of a memory 12, and transmits a control signal to a signal processing circuit 18. The signal processing circuit 18 generates a down TDMA/TDM frame in which polling information to the subscriber's station of the first data area is included in a control channel. The subscriber's station does not respond to the polling at the time of not demanding any communication channel. Afterwards, the controller 20 successively reads the data area of the memory content, and operates polling to each subscriber's station. Thus, it is possible to prevent communication channel assignment requests from being simultaneously transmitted from subscriber's stations.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a subscriber radio communication system comprising a base station and a plurality of subscriber stations, and connecting the base station and the subscriber stations by radio.

[0002]

2. Description of the Related Art With the advance of advanced information technology, the amount of information communication has rapidly increased, and information contents have been diversified, such as telephones, faxes, data, images, and the like. I have. However, existing communication networks mainly using metallic cables cannot adequately cope with large-scale and diverse information and communication needs, and optical fiber cables have sufficient transmission capacity, but cost, land use, etc. Because of the many restrictions, maintenance is not always quick. For these reasons, it is necessary to develop and commercialize a subscriber wireless communication system as a wireless communication system that achieves high speed and broadband while enabling the construction of a communication network at low cost and in a short period of time when the communication network is advanced. It has been. The subscriber wireless communication system is expected to be used more effectively in the future from the above viewpoints.

FIG. 15 shows an example of a system configuration of a subscriber radio communication system, wherein 1 is a base station, 2 is a subscriber station,
3 is a radio signal between the base station and the subscriber station, 4 is a base station 1
, A base station installation building, 6 a subscriber station installation building, 7 an optical fiber relay transmission line, and 8 a network such as a public network. FIG. 16 is a diagram showing a frame configuration example of the radio signal 3 between the base station and the subscriber station, and 9 is a TDMA (Time Division Mu).
single access) / TDM (Time D)
(i.e., Vision Multiple) frame.
FIG. 17 is a diagram schematically showing how a communication channel assignment request from the subscriber station 2 in the conventional subscriber wireless communication system collides. In each drawing, the same numbers as those in the other drawings are the same or the same.

Next, the operation will be described. The base station 1 and the network 8 are connected by an optical fiber relay transmission line 7. The radio signal 3 between the base station 1 and the subscriber station 2 is shown in FIG.
As shown in FIG. 6, a TDMA / TDM frame 9 is obtained by time-division multiplexing a control channel that the subscriber station 2 and the base station 1 can always access for each frame and a plurality of channels that can be accessed when the allocation request is permitted. Yes, base station 1
The downlink radio signal 3 from the subscriber station 2 to each subscriber station 2 is TDM (time division multiplex), and the uplink radio signal 3 from each subscriber station 2 to the base station 1
Is TDMA (Time Division Multiple Access). In general, the radio signal 3 uses a pair of frequencies in the up direction and the down direction. The base station 1 constantly transmits the downlink radio signal 3 so as to form the radio communication area 4. The subscriber station 2 receives the downlink radio signal 3 from the base station 1 and checks whether there is incoming call information or the like addressed to itself in the control channel in the downlink TDMA / TDM frame 9. When transmitting information from the subscriber station 2 to the base station 1, the uplink TDMA / TDM frame 9 is transmitted to the base station 1.
A communication channel assignment request is transmitted using the control channel of (1). Thereafter, the base station 1 transmits a communication channel assignment instruction on the control channel in the downlink TDMA / TDM frame 9, and the subscriber station 2 that has transmitted the communication channel assignment request receives the communication channel assignment instruction, and thereafter, The wireless communication is performed with the base station 1 using the designated communication channel.

Here, the operation when a plurality of subscriber stations 2 transmit a communication channel assignment request simultaneously will be described.
FIG. 17 shows an example in which two subscriber stations 2 (subscriber station # 1 and subscriber station # 2) simultaneously transmit communication channel assignment requests. When two subscriber stations 2 simultaneously transmit a communication channel assignment request to the base station 1 using the same control channel, the base station 1
Before reaching the communication channel, the communication channel assignment request is extinguished. Since each subscriber station 2 does not receive a communication channel assignment instruction from the base station 1, it determines that the communication channel assignment request transmitted by itself has collided with a communication channel assignment request transmitted by another subscriber station 2, and again, A communication channel assignment request is transmitted to the base station 1.

[0006]

In the conventional subscriber radio communication system, each subscriber station transmits a communication channel assignment request to the base station 1 by arbitrarily using a control channel in the uplink TDMA / TDM frame 9. Therefore, there is a possibility that a plurality of subscriber stations 2 transmit a communication channel assignment request at the same time. If the communication channel assignment requests are transmitted at the same time, a collision of transmission waves occurs as described above. , The communication channel assignment request must be transmitted to the base station 1 again. In addition, when the number of subscriber stations 2 increases, there is a problem that the probability of occurrence of a collision of a communication channel assignment request increases, and the communication line connection efficiency decreases.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-described problems, and avoids collision of a communication channel assignment request transmitted from each subscriber station 2 to the base station 1, thereby efficiently providing the subscriber station 2 To obtain a subscriber wireless communication system to which a communication channel can be assigned.

[0008]

According to a first aspect of the present invention, there is provided a subscriber radio communication system comprising: a plurality of subscriber stations to which subscriber terminals are connected; and a control channel capable of being constantly connected to the subscriber stations. And time division multiplexed TDM for a plurality of communication channels that can be connected only when the assignment is set
A (Time Division Multiple)
Access) / TDM (Time Division)
(Multiple) signal processing means for generating a transmission signal of a frame or separating a reception signal, and the above-mentioned subscriber station requesting the above-mentioned communication channel via the above-mentioned control channel so as to allocate the above-mentioned communication channel. In a subscriber wireless communication system including a base station having control means for controlling a signal processing means, information provided in the base station and indicating whether or not the communication channel is allocated is associated with each of the subscriber stations. The control means of the base station transmits a polling signal via the control channel to the subscriber station in which the information indicating that a communication channel is not allocated is stored in the storage means. The subscriber station allocates a communication channel only when a polling signal is received from the base station. Those having a requested function.

[0009] In the subscriber radio communication system according to the second invention, in the first invention, the control means has a function of transmitting a polling signal to the subscriber station in the order of the generated random numbers. is there.

Further, in the subscriber wireless communication system according to a third invention, in the first invention, the storage means stores the respective subscriptions in response to a priority setting request or a change request from the subscriber station. A storage area for storing a priority in association with a subscriber station, wherein the control means is configured to register the high-priority subscription to the subscriber station in which the information indicating that a communication channel is not allocated is stored in the storage means. In addition to the function of increasing the frequency of transmitting a polling signal to a subscriber station, the function of reducing the frequency of transmitting a polling signal to a subscriber station having a lower priority is provided.

In a fourth aspect of the present invention, in the subscriber wireless communication system according to the first aspect, the storage means includes a storage area for storing a communication channel allocation frequency in association with each of the subscriber stations. The control means controls the transmission frequency of the polling signal to the subscriber station in which the frequency is higher than a preset frequency, for the subscriber station in which the information indicating that the communication channel is not allocated is stored in the storage means. And a function of reducing the frequency of transmitting polling signals to subscriber stations whose frequency is lower than a preset frequency.

A subscriber wireless communication system according to a fifth aspect of the present invention includes a plurality of subscriber stations to which subscriber terminals are connected, wireless communication with the subscriber stations, demodulation of received signals, and reception of the subscriber stations. Transmission / reception means for modulating a transmission signal to a subscriber station, a time division multiplexed TDMA (Time Division) in which a control channel that can always be connected to the subscriber station and a plurality of communication channels that can be connected only when assignment is set
n Multiple Access) / TDM (Tim
e Division Multiple) The communication channel is allocated to signal processing means for generating a transmission signal of a frame or separating a reception signal, and to the subscriber station requesting the allocation of the communication channel via the control channel. In a subscriber wireless communication system comprising a base station having control means for controlling the signal processing means, the control channel has a first control channel and a second control channel, the base station,
Storage means for storing information indicating whether or not the communication channel is allocated, and information indicating the use setting of the first and second control channels in association with the respective subscriber stations; Means for sequentially transmitting a polling signal via the first control channel to the subscriber station in which the information on the unallocated communication channel and the information on the use of the first control channel are stored in the storage means. With a polling function, the subscriber station is set to use one of the first and second control channels, and the subscriber station set to use the first control channel is the base station A function of requesting a communication channel assignment only when a polling signal is received from a subscriber station, and a subscriber station set to use the second control channel is randomly assigned via the second control channel. Those having a function of requesting a communication channel assignment.

[0013]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiment 1 FIG. 1 is a configuration diagram of a subscriber wireless communication system according to Embodiment 1 of the present invention, FIG. 2 is a block diagram illustrating a configuration of a base station communication device according to Embodiment 1 of the present invention, and FIG. FIG. 4 is a diagram showing one mode of memory contents in the base station communication device according to the first embodiment of the present invention, and FIG. 4 shows a polling sequence between the base station and each subscriber station according to the first embodiment of the present invention. In the figure, the vertical axis is the time axis. Also,
FIG. 5 is a diagram showing the sequence of FIG. 4 focusing on the control channel and the used channel of the TDMA / TDM frame 9, and the horizontal axis is the time axis. FIG. 6 is a diagram showing one mode of the memory contents in the base station communication device for explaining the sequences of FIGS. 4 and 5.

In FIG. 1, reference numeral 10 denotes a transmitting / receiving antenna of the base station 1, reference numeral 11 denotes a base station communication device for controlling communication in the base station 1, and reference numeral 12 denotes a memory arranged in the base station communication device which characterizes the present invention. , 13 is a transmitting / receiving antenna of the subscriber station 2, 14 is a subscriber station communication device for controlling communication in the subscriber station, and 15 is a subscriber terminal such as a personal computer connected to the subscriber station communication device 14. The terminal 16 is a telephone which is a subscriber terminal connected to the subscriber station communication device 14. In FIG. 1, the same numbers as those in the other drawings are the same or the same.

In FIG. 2, reference numeral 17 denotes a transmission / reception circuit connected to the antenna 10 for demodulating a signal received by the antenna 10 and modulating a signal transmitted from the antenna 10, and 18 denotes a component of the TDMA / TDM frame 9, separation, etc. A signal processing circuit connected to a transmission / reception circuit 17 for performing baseband signal processing, a line interface circuit 19 connected to a signal processing circuit 18 for performing interface processing with the network 8, and 20 connected to the memory 12, Is a controller that reads and writes the contents of the data and controls polling of the signal processing circuit 18.

In FIG. 3, reference numeral 21 denotes the memory contents of the memory 12 before the operation starts. In FIG. 6, reference numeral 22 denotes the contents of the memory 12 when the polling sequence of FIG. 4 is performed and a communication channel is allocated to the subscriber station # 3.

Next, the operation will be described. Here, as an example, a case where the number of subscriber stations 2 is four (subscriber station # 1 to subscriber station # 4) will be described. The connection between the base station 1 and the network 8 is the same as that described in the related art.

The memory 12 in the base station communication device 11 includes:
The subscriber station identification code of the subscriber station 2 to be managed by the own station as in the memory content 21 and the communication channel use state data of each of the plurality of subscriber stations 2 are associated with each data area. It is remembered. Controller 20
First, the controller 20 reads the first data area of the memory contents 21 when the operation is disclosed. The first data area indicates that the subscriber station # 1 is a subscriber station identification code, and that the subscriber station is unused as communication channel use state data, that is, the subscriber station # 1 is idle. Therefore, the controller 20 inserts polling information for the subscriber station # 1 into the control channel of the downlink TDMA / TDM frame in order to confirm the presence or absence of the communication channel allocation request of the subscriber station # 1. The control signal is transmitted to the signal processing circuit 18. The signal processing circuit 18 generates a downlink TDMA / TDM frame containing the polling information for the subscriber station # 1 in the control channel, and transmits the generated signal to the transmission / reception circuit 17. The transmission / reception circuit 17 performs necessary modulation and the like, transmits the signal to the antenna 10, and the antenna 10 transmits the radio signal 3. If there is no request to use the communication channel from the subscriber terminal 15 or the telephone 16, the subscriber station # 1 does not respond when receiving the polling from the base station 1. Controller 20
Is the downlink TD containing the polling information for the subscriber station # 1.
Uplink TDMA / TDM corresponding to MA / TDM frame
If there is no communication channel allocation request from the subscriber station # 1 during the control channel of the frame, it is determined that there is no communication channel allocation request from the subscriber station # 1, and the second data area of the memory content 21 is read. The second data area indicates that the subscriber station # 2 is a subscriber station identification code, and that it is unused as communication channel use state data, that is, the subscriber station # 2 is idle. Therefore, the controller 20 performs polling to the subscriber station # 2 in the same operation as transmitting the polling to the subscriber station # 1. Thereafter, the controller 20 sequentially reads the data area of the memory content 21 and sequentially polls each subscriber station 2.

Referring to FIGS. 4 and 5, an operation when a communication channel allocation request is issued from the subscriber station 2 will be described. As described above, the base station 1 sequentially polls each subscriber station 2 according to the memory contents 21. Here, when polling is performed on the subscriber station # 3, the subscriber station # 3
In the case where there is a request to use the communication channel from the subscriber terminal 15 or the telephone 16, the subscriber station # 3 sends a base station 1 to the base station 1 a radio signal of an uplink TDMA / TDM frame in which a communication channel allocation request is entered as a control channel. 3 is transmitted. The base station 1 looks at the control channel of the uplink TDMA / TDM frame separated by the signal processing circuit 18 by the controller 20, recognizes that the communication channel assignment request is returned from the subscriber station # 3, and A communication channel (in this example, communication channel # 1) is selected, and a signal of a downlink TDMA / TDM frame is generated by the signal processing circuit 18 so as to perform communication using the communication channel # 1. Base station 1 transmits a communication channel assignment instruction to subscriber station # 3 using the control channel. Subscriber station # 3 is downlink TD
It recognizes that communication channel # 1 has been allocated from the contents of the control channel of the MA / TDM frame, and starts communication using communication channel # 1. When the communication is started, the controller 20 changes the memory 12 from the unused state to the communication channel use state data corresponding to the subscriber station # 3 in the third data area, as shown in the memory contents 22 shown in FIG. Rewrite to # 1 in use. afterwards,
The controller 20 reads the fourth data area.
The fourth data area indicates that the subscriber station # 4 is a subscriber station identification code, and that the communication channel use state data is unused, ie, that the subscriber station # 4 is idle. Therefore, the base station 1 polls the subscriber station # 4 by the above-described polling operation by the controller 20. After processing to the last data area, the controller 20 returns to the first data area and continues processing. Since the communication channel use state data corresponding to the subscriber station # 3 in the memory 12 is in use of the communication channel # 1 like the memory content 22, the polling to the subscriber station # 3 is not performed. After the polling of the subscriber station # 2, the polling of the subscriber station # 4 is performed. Also, when the subscriber station # 3 terminates the communication and releases the communication channel, the memory 12 becomes unused because the communication channel use state data corresponding to the subscriber station # 3 as in the memory content 21 is not used. When it comes around, the polling is also performed to the subscriber station # 3. Since polling is performed using the control channel, there is no need to newly provide a dedicated polling antenna at the base station or the subscriber station.
Equipment for polling can be reduced.

By operating as described above, the communication channel assignment requests from the plurality of subscriber stations 2 are not transmitted at the same time, and the communication channel assignment requests from the respective subscriber stations 2 reach the base station 1. Since there is no collision beforehand, a communication channel can be efficiently allocated to the subscriber station 2.

In this embodiment, four subscriber stations # 1 to # 4 have been described. However, it is needless to say that the number of subscriber stations may be larger.

Embodiment 2 FIG. FIG. 7 is a block diagram showing a configuration of a base station communication apparatus according to Embodiment 2 of the present invention, and FIG. 8 is a block diagram showing base station 1 according to Embodiment 2 of the present invention.
FIG. 4 is a diagram showing a polling sequence between a subscriber and a subscriber station.

In FIG. 7, reference numeral 23 denotes a random number generator for randomly generating the number of the data area stored in the memory 12. In FIG. 7, the same numbers as those in the other drawings are the same or the same.

Next, the operation will be described. Here, as an example, a case where the number of subscriber stations 2 is four (subscriber station # 1 to subscriber station # 4) will be described. As in the first embodiment, the memory 12 in the base station communication device 11 has a memory content 2
1, the subscriber station identification code of the subscriber station 2 to be managed by the own station and the communication channel use state data of each of the plurality of subscriber stations 2 are stored in association with each data area. ing. The data area number of the memory 12 generated by the random number generator 23 is input to the controller 20. The controller 20 reads the subscriber station identification code and the communication channel use state data of the data area corresponding to the data area number inputted from the random number generator 23, and sends the data to each subscriber station 2 by the same operation as in the first embodiment. Polling is performed (in this example, the random number generator 23 causes the subscriber station # 1 → the subscriber station # 3 → the subscriber station #
4 → subscriber station # 2 → subscriber station # 4 → subscriber station # 1 → subscriber station # 3 → subscriber station # 2 → subscriber station # 4... When a communication channel assignment request is returned from the subscriber station 2 that has performed polling, a communication channel is assigned by the same operation as in the first embodiment.

By operating as described above, the communication channel assignment requests from the plurality of subscriber stations 2 are not transmitted at the same time, and the communication channel assignment requests from the respective subscriber stations 2 reach the base station 1. Since there is no collision beforehand, a communication channel can be efficiently allocated to the subscriber station 2.

Embodiment 3 FIG. FIG. 9 is a diagram showing the contents of the memory in the base station communication device 11 according to the third embodiment of the present invention, and FIG. 10 is a diagram showing the polling between the base station 1 and the subscriber station 2 in the third embodiment of the present invention. FIG. 3 is a diagram showing a sequence.

Next, the operation will be described. Here, as an example, a case where the number of subscriber stations 2 is four (subscriber station # 1 to subscriber station # 4) will be described. The memory 12 in the base station communication device 11 stores the subscriber station identification code of the subscriber station 2 to be managed by the base station 1 and the communication channel use state data of each of the plurality of subscriber stations 2. And memory contents 24 indicating polling priority data are stored in association with each data area. Controller 2
To explain the operation of 0, first, the controller 20 reads the first data area of the memory contents 24. In the first data area, the subscriber station # 1 is used as a subscriber station identification code, unused as communication channel use state data, and high as polling priority data, ie, subscriber station # 1.
Is idle and has a high polling priority. Therefore, the controller 20 is used in the first embodiment.
The polling is performed to the subscriber station # 1 by the same operation as described above. Since the communication channel allocation request from the subscriber station # 1 has not been transmitted to the base station 1, the controller 20 reads the second data area. In the second data area, the subscriber station # 2 is used as a subscriber station identification code, the communication channel use state data is unused, and the polling priority data is low. That is, the subscriber station # 2 is idle and the polling priority is low. Is shown to be low. Controller 2
Since 0 is a low polling priority, the third data area is read this time without polling the subscriber station # 2. Thereafter, in the first round of processing, the controller 20
Sequentially reads the data area, and the polling priority data is high, that is, the subscriber station 2 which has a high polling priority and does not use the communication channel (in this example, subscriber station # 1 and subscriber station # The polling is performed in 3), and the polling priority data is low, that is, the subscriber stations 2 (in this example, the subscriber stations # 2 and # 4) having low priority are not polled. The final data area (in this example,
When the processing up to (fourth) is completed, the second round of processing is performed. In the second round of processing, the subscriber station 2 that does not use the communication channel is sequentially polled regardless of the polling priority data. Therefore, as shown in FIG. 10, the polling from the base station 1 is performed for the subscriber station 2 having a low polling priority and not using the communication channel (in this example, the subscriber station # 2 and the subscriber station # 2). Polling to 4) is 1
During the round, the polling is performed twice for the subscriber station 2 (in this example, the subscriber station # 1 and the subscriber station # 3) which has a high polling priority and does not use the communication channel. In addition, 3
In the processing of the odd number round such as the fifth round, the same processing as the processing of the first round is performed, and in the processing of the fourth round, the sixth round... Processing similar to the processing is performed. When a communication channel assignment request is returned from the subscriber station 2 that has performed polling, a communication channel is assigned by the same operation as in the first embodiment.

Next, the polling priority data of the memory contents 24 will be described. The polling priority data can be changed in accordance with a request from the subscriber station 2 in addition to being set when each subscriber station 2 is registered in the base station 1. The subscriber station 2 that wants to change the polling priority data receives a polling addressed to itself from the base station 1 and sends a polling priority change request to the base station 1 using the control channel of the uplink TDMA / TDM frame. Send. When the controller 20 of the base station 1 receives a polling priority change request from the subscriber station 2, the polling priority data is changed (changed to high if the current priority is low, and changed to low if the current priority is high). Is performed. In this embodiment, two cases of high priority and low priority are shown as an example, but the same can be achieved by increasing the degree of priority to two or more.

By operating as described above, the same effects as in the first embodiment can be obtained, and even when the number of subscriber stations to be managed increases, the polling cycle to the subscriber station having a higher polling priority is performed. However, there is an effect that does not decrease with respect to the first embodiment. Furthermore, since the polling priority can be changed at the request of each subscriber station, the usage form of the subscriber station, for example,
In the daytime, there are many communication requests, so that the polling priority is set high. In the nighttime, since there are few communication requests, the polling priority is lowered, so that a flexible response can be made.

Embodiment 4 FIG. 11 is a diagram showing the contents of the memory in base station communication apparatus 11 according to Embodiment 4 of the present invention, and FIG. 12 is a diagram showing the polling between base station 1 and subscriber station 2 in Embodiment 4 of the present invention. FIG. 3 is a diagram showing a sequence.

Next, the operation will be described. Here, as an example, a case where the number of subscriber stations 2 is four (subscriber station # 1 to subscriber station # 4) will be described. The memory 12 in the base station communication device 11 stores the subscriber station identification code of the subscriber station 2 to be managed by the base station 1 and the communication channel use state data of each of the plurality of subscriber stations 2. , Memory contents 25 indicating communication channel use frequency data and communication channel use frequency data are stored in association with each data area. The operation of the controller 20 will be described. First, the controller 20 reads the first data area of the memory content 25. The first data area includes the subscriber station # 1 as the subscriber station identification code, unused as the communication channel use state data, and the past communication channel use count (4 in this example) as the communication channel use count data.
0), the communication channel use frequency data is high, that is, the subscriber station # 1 is idle and the communication channel use frequency is high. Therefore, the controller 20 polls the subscriber station # 1 in the same operation as in the first embodiment. Since the communication channel allocation request from the subscriber station # 1 has not been transmitted to the base station 1, the controller 20 reads the second data area. In the second data area, the subscriber station # is used as a subscriber station identification code.
2. Unused as communication channel use status data, past communication channel use count (5 in this example) as communication channel use count data, low as communication channel use frequency data, ie, subscriber station # 2 is idle It shows that the communication channel usage frequency is low. Since the frequency of use of the communication channel is low, the controller 20 reads the third data area without polling the subscriber station # 2 this time. Thereafter, in the first round of processing, the controller 20 sequentially reads the data area, and the communication channel use frequency data is high, that is, the subscriber station 2 (this subscriber station) that uses the communication channel frequently and does not use the communication channel. In the example, the polling is performed on the subscriber station # 1), and the communication channel use frequency data is low, that is, the subscriber station 2 (in this example, the subscriber station # 2,
No polling is performed on the subscriber stations # 3 and # 4). When the processing up to the final data area (fourth in this example) is completed, a second round of processing is performed. In the second round of processing, the communication channel is not used regardless of the communication channel use frequency data. Subscriber station 2 (in this example, subscriber station #
1 to the subscriber station # 4). Therefore, polling from the base station 1 as shown in FIG.
The polling is performed once to the subscriber station 2 (in this example, the subscriber station # 2, the subscriber station # 3, and the subscriber station # 4) that uses the communication channel less frequently and does not use the communication channel. This is performed twice for the subscriber station 2 (in this example, the subscriber station # 1) that uses the communication channel frequently and does not use the communication channel. Third round, fifth round ...
In the odd round process, the same process as the first process is performed, and in the fourth, sixth,..., And even processes, the same process as the second process is performed. . When a communication channel assignment request is returned from the subscriber station 2 that has performed polling, a communication channel is assigned by the same operation as in the first embodiment.

The communication channel use count data in the memory content 25 is increased by the controller 20 every time the subscriber station 2 uses the communication channel. The communication channel use frequency data is obtained by comparing the communication channel use frequency value of each subscriber station 2 obtained by the calculation shown in Expression 1 with a threshold value preset in the controller 20. The communication channel use frequency data is set to be high when the communication channel use frequency value is larger than the threshold value, and to be low when the communication channel use frequency value is smaller than the threshold value. In this embodiment, the use frequency data is set in two stages.
The same can be achieved by setting two or more steps such as medium and low.

[0033]

(Equation 1)

By operating as described above, the same effects as in the first embodiment can be obtained, and even when the number of subscriber stations to be managed increases, the frequency of use of the communication channel can be compared with that in the first embodiment. There is an effect that the polling cycle to the subscriber station having a high frequency does not decrease.

Embodiment 5 FIG. FIG. 13 is a diagram showing a TDMA / TDM frame structure according to the fifth embodiment of the present invention, and FIG. 14 is a diagram showing memory contents in the base station communication device according to the fifth embodiment of the present invention.

Next, the operation will be described. Here, as an example, a case where the number of subscriber stations 2 is four (subscriber station # 1 to subscriber station # 4) will be described. Base station 1 and subscriber station 2
As shown in FIG. 13, two control channels are prepared in the TDMA / TDM frame of the radio signal 3 between the two channels.
The control channel # 1 is connected to each subscriber station 2 as in the first embodiment.
Is a control channel that allows each subscriber station 2 to randomly transmit a communication channel connection request to the base station 1 as in the conventional subscriber wireless communication system. is there. The memory 12 in the base station communication device 11 stores the subscriber station identification code of the subscriber station 2 to be managed by the base station 1 and the communication channel use state data of each of the plurality of subscriber stations 2. , Memory contents 27 indicating communication channel use frequency data, communication channel use frequency data, and use control channel data are stored in association with each data area. The controller 20 sequentially reads each data area of the memory content 27 by the same operation as in the first embodiment, and sets the subscriber station to use the control channel # 1 and does not use the communication channel. 2 is polled using the control channel # 1. The subscriber station 2 (in this example, the subscriber station # 3 in which the used control channel data of the read data area is the control channel # 2). , The subscriber station # 4) does not perform polling, but operates to read the data of the next data area. In the case where a communication channel assignment request is returned from the subscriber station 2 that has performed polling, the first embodiment is used.
A communication channel is allocated by the same operation as in. The subscriber station 2 using the control channel # 2 (the subscriber station # 3 and the subscriber station # 4 in this example) uses the control channel # 2 in the same manner as in the related art to send a communication channel assignment request. The communication is transmitted to the base station 1 and communication is performed by receiving a communication channel from the base station 1. The usage control channel data of each subscriber station 2 is set to control channel # 1 if the communication channel usage frequency data is high, and to control channel # 2 if the communication channel usage frequency data is low. ing. Further, the communication channel use frequency data is determined by the same processing as in the fourth embodiment.

By operating as described above, the same effects as in the first embodiment can be obtained, and even when the number of subscriber stations 2 to be managed increases, a communication channel is frequently used and a communication channel allocation request is issued. A communication channel assignment request from a subscriber station 2 having a high probability of collision does not collide with the subscriber station 2 efficiently.
Has the effect of assigning a communication channel to

[0038]

According to the first and second aspects of the present invention, communication channel assignment requests are not transmitted from a plurality of subscriber stations at the same time. Since the collision does not occur before reaching the base station, the communication channel can be efficiently allocated to the subscriber station.

According to the third invention, in addition to the effect of the first invention, even when the number of subscriber stations increases, the polling cycle to the subscriber station having a higher polling priority does not decrease. . Furthermore, since the polling priority can be changed at the request of each subscriber station, the usage mode of the subscriber station, for example, during the daytime, there are many communication requests, so the polling priority is increased,
Since there are few communication requests during the night, a flexible response such as lowering the polling priority becomes possible.

According to the fourth invention, in addition to the effect of the first invention, even when the number of subscriber stations increases, the polling cycle to the subscriber station that frequently uses the communication channel does not decrease.

Further, according to the fifth invention, in addition to the effect of the first invention, even when the number of subscriber stations increases, the frequency of use of the communication channel is high and the probability of collision of the communication channel assignment request is high. There is an effect that the communication channel can be efficiently allocated to the subscriber station without collision of the communication channel allocation request from the subscriber station.

[Brief description of the drawings]

FIG. 1 is a configuration diagram of a subscriber wireless communication system according to Embodiment 1 of the present invention.

FIG. 2 is a block diagram showing a configuration of a base station communication device according to Embodiment 1 of the present invention.

FIG. 3 is a diagram showing memory contents in a base station communication device according to Embodiment 1 of the present invention.

FIG. 4 is a diagram showing a polling sequence between a base station and a subscriber station according to Embodiment 1 of the present invention.

FIG. 5 shows a polling sequence between a base station and a subscriber station according to Embodiment 1 of the present invention in TDMA / TDM.
FIG. 5 is a diagram showing the respective channels of FIG.

FIG. 6 is a diagram showing memory contents in the base station communication device according to the first embodiment of the present invention.

FIG. 7 is a block diagram showing a configuration of a base station communication device according to Embodiment 2 of the present invention.

FIG. 8 is a diagram showing a polling sequence between a base station and a subscriber station according to Embodiment 2 of the present invention.

FIG. 9 is a diagram showing memory contents in a base station communication device according to Embodiment 3 of the present invention.

FIG. 10 is a diagram showing a polling sequence between a base station and a subscriber station according to Embodiment 3 of the present invention.

FIG. 11 is a diagram showing memory contents in a base station communication device according to Embodiment 4 of the present invention.

FIG. 12 is a diagram showing a polling sequence between a base station and a subscriber station according to Embodiment 4 of the present invention.

FIG. 13 shows TDMA in Embodiment 5 of the present invention.
FIG. 3 is a diagram showing a / TDM frame configuration.

FIG. 14 is a diagram showing memory contents in a base station communication device according to Embodiment 5 of the present invention.

FIG. 15 is a diagram illustrating a system configuration example of a subscriber wireless communication system.

FIG. 16 shows T in a conventional subscriber wireless communication system.
FIG. 3 is a diagram illustrating a configuration example of a DMA / TDM frame.

FIG. 17 is a diagram showing a collision pattern of a communication channel assignment request in a conventional subscriber wireless communication system.

[Explanation of symbols]

1 base station, 2 subscriber station, 3 radio signal, 4 radio communication area, 5 base station installation building, 6 subscriber station installation building, 7 optical fiber relay transmission line, 8 network, 9
TDMA / TDM frame, 10 transmitting / receiving antenna,
11 base station communication device, 12 memory, 13 transmitting / receiving antenna, 14 subscriber station communication device, 15 subscriber terminal, 1
6 telephone, 17 transmitting / receiving circuit, 18 signal processing circuit, 1
9 line interface circuits, 20 controllers, 2
1 memory contents, 22 memory contents, 23 random number generator, 24 memory contents, 25 memory contents, 26 TD
MA / TDM frame, 27 memory contents.

Claims (5)

[Claims] 1. A plurality of subscriber stations to which subscriber terminals are connected, and transmission / reception means for wirelessly communicating with the subscriber stations to demodulate received signals and modulate transmission signals to the subscriber stations.
A TDMA (Time Division) in which a control channel that can always be connected to the subscriber station and a plurality of communication channels that can be connected only when an assignment is set are time-division multiplexed.
on Multiple Access) / TDM (T
The communication channel is allocated to signal processing means for generating a transmission signal or separating a reception signal of an image division multiple) frame and to the subscriber station requesting the allocation of the communication channel via the control channel. A base station having control means for controlling the signal processing means, wherein the base station has a base station, and information indicating whether or not the communication channel is allocated corresponds to each of the subscriber stations. Storage means for adding and storing, and the control means of the base station sequentially sends a polling signal via the control channel to the subscriber station in which the information indicating that a communication channel is not allocated is stored in the storage means. A polling function for transmitting is provided, and the subscriber station receives a polling signal from the base station. A subscriber wireless communication system having a function of requesting communication channel assignment. 2. The subscriber wireless communication system according to claim 1, wherein said control means has a function of transmitting a polling signal to a subscriber station in the order of the generated random numbers. 3. The storage means includes a storage area for storing a priority in association with each of the subscriber stations in response to a priority setting request or a change request from the subscriber station. The means increases the frequency of transmitting a polling signal to the higher-priority subscriber station for the subscriber station in which the information on the unallocated communication channel is stored in the storage means, and decreases the priority of the lower-priority subscriber station. 2. The subscriber wireless communication system according to claim 1, further comprising a function of reducing a frequency of transmitting a polling signal to the subscriber station. 4. The storage means includes a storage area for storing a communication channel allocation frequency in association with each of the subscriber stations, and the control means stores information indicating that a communication channel is not allocated in the storage means. For the stored subscriber station, the frequency of sending a polling signal to the subscriber station whose frequency is higher than a preset frequency is increased, and the frequency of transmission of the polling signal to the subscriber station whose frequency is lower than the preset frequency is increased. 2. The subscriber wireless communication system according to claim 1, further comprising a function of reducing a frequency of transmitting a polling signal. 5. A plurality of subscriber stations to which subscriber terminals are connected, and transmission / reception means for wirelessly communicating with the subscriber stations, for demodulating received signals and modulating transmission signals to the subscriber stations.
A TDMA (Time Division) in which a control channel that can always be connected to the subscriber station and a plurality of communication channels that can be connected only when an assignment is set are time-division multiplexed.
on Multiple Access) / TDM (T
The communication channel is allocated to signal processing means for generating a transmission signal of an image division multiple) frame or separating a received signal, and to the subscriber station requesting the allocation of the communication channel via the control channel. A base station having a control means for controlling the signal processing means, wherein the control channel has a first control channel and a second control channel, the base station, the base station, Storage means for storing information indicating the presence or absence of communication channel assignment and information indicating the use setting of the first and second control channels in association with the respective subscriber stations, and controlling the base station The information on the unallocated communication channel and the information on the use of the first control channel are stored in the storage means. A polling function for sequentially transmitting a polling signal to the subscriber station via the first control channel is provided, and the subscriber station can use any one of the first and second control channels. Is set,
The subscriber station set to use the first control channel has a function of requesting a communication channel assignment only when receiving a polling signal from the base station, and the use of the second control channel is set. A subscriber wireless communication system, characterized in that the subscriber station has a function of randomly requesting a communication channel assignment via a second control channel.