JPH07110073B2 - Subscriber wireless communication system - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a subscriber wireless communication system for efficiently concentrating and connecting telephones and data of subscribers scattered over a wide area to a switching network by using a wireless line. It is a thing.

[Prior Art] Conventionally, communication devices of this type are classified into two types according to their systems, and have the configurations shown in FIGS. 2 and 3, respectively. The one shown in Fig. 2 is time division multiplexing {TDM / TDMA (Time Division
Multiplex / Time Division Multiple Access) system, which connects the M subscriber lines 1-1 to M of the exchange 100 to the subscriber terminals 301-1 to 301-1 through wireless lines. M subscriber lines 1-1 to M are wireless line control devices
By 101, the multiplex digital signal 2 having N transmission channels is concentrated and multiplexed. The multiplex signal 2 is converted by the baseband control device 102 into a time division multiplex frame format 3 of a wireless transmission line as shown in FIG. 4, and the wireless transmission / reception device 103 performs modulation and frequency conversion to make a subscriber station 104.
-1 to M are transmitted. Each subscriber station 104-1 to M
In (for example 104-1), the baseband signal 5 demodulated by the transmission / reception circuit 201 has the designated transmission channel extracted by the line control circuit 202 in accordance with the line control command from the base station, and the subscriber circuit 203. Subscriber end 301
-1 is converted into an interface signal 7-1 and is connected to the subscriber terminal 7-1. In this case, the number of subscriber lines M
And the number N of wireless transmission channels are in a relation of M> N, and the demand assign method is adopted in which the subscriber terminals 301-1 to 301-1M are allowed to use the channel only when they make a call. . The wireless line control device 101 of the base station always grasps the use status of the line,
Each subscriber station is notified through the line control channel of the radio frame, and each subscriber station issues a line connection request on the specified channel only when the terminal of its own station makes a call accordingly. The connection with the line is made.

The one shown in FIG. 3 is a multi-channel access {MCA (Multi
-Channel Access)} system, the M subscriber lines 1-1 to M of the exchange 100 are controlled by the radio network controller 401.
It is concentrated and connected to N individual transmission channels. The individual transmission signals 10-1 to 10-N are modulated by the radio transmission / reception circuits 402-1 to 40-N, converted into signals having carrier frequencies f1 to fN, respectively, as shown in FIG. Is sent to the office. Each subscriber residence 404-1 to M
In (for example, 404-1), the transmission / reception circuit 501 demodulates the signal fj of the designated carrier frequency, and this signal 12 is transmitted to the subscriber terminal 30 by the subscriber circuit 503 via the line control circuit 502.
It is converted to an interface signal 7-1 with 1-1 and connected to the subscriber terminal 301-1. Also in this case, the number of subscriber lines M
And the number N of wireless carrier channels are in a relation of M> N, and a demand assign method is used in which a designated carrier channel is used only when an incoming / outgoing call is made from each subscriber terminal. In addition, the notification of the access channel from the base station to each of the subscriber stations 404-1 to 404-1M specifies one of the empty channels for access and sends an idle signal indicating the empty channel to the channel,
The subscriber station may use the line control circuit 502 to search for each carrier channel and wait on an empty channel, or specify a specific carrier channel exclusively for the line control channel and wait for each subscriber station on that channel when idle. is there.

[Problems to be Solved by the Invention] The above-mentioned conventional methods have the following advantages and disadvantages.

(1) TDM / TDMA system [Advantages] [1] All signals are digitally multiplexed on a pair of frequencies (one wave for transmission and one for reception), so the relay station configuration is simple and transmission quality is maintained regardless of the number of relays. Is less deteriorated.

[2] Since the transmission signal and the line control signal are multiplexed and transmitted, each subscriber station can always grasp the line use status, and the line control is easy.

[3] Since the transmission signal is multiplexed in one wave, it is possible to connect many subscriber terminals at the subscriber station at the same time.

[Disadvantages] [1] Even if only one subscriber terminal is connected, processing of all transmission channels and line control signal systems is basically required, so there are many common parts and inefficiency in the case of one terminal .

[2] Since multiplex transmission is performed, the radio frequency band is wide, and the power per subscriber terminal is not effectively used. Therefore, the service distance is narrowed due to the wireless circuit design, which is disadvantageous when the number of terminals is small. .

(2) MCA method [Advantage] [1] Since one terminal has a pair of carrier channels, TDM / TDMA
In the same power modulation method, the transmission distance can be made larger than that of the method.

[2] The configuration of the subscriber station can be simplified by only processing for one terminal.

[Disadvantages] [1] Basically, only one terminal can be connected to one subscriber station.

[2] Since a large number of carrier channels are used, a large number of transceivers are required in the relay station as well, which is uneconomical in the case of multiple relays.

Therefore, as the application area of these methods, the following complementary uses are advantageous. In other words, the TDM / TDMA method is a connection in which a large number of subscriber terminal groups are connected in each town or village while performing multiple relays in an area where subscribers form a group to some extent in towns or villages scattered over a very wide area. It is used when the station is grounded. Incidentally, each subscriber terminal and subscriber station are connected by a metallic cable. On the other hand, the MCA method can efficiently accommodate individual subscriber terminals scattered in one area, but is not suitable for accommodating a wide range of subscriber groups, which is the application area of the TDM / TDMA method. Not suitable.

The present invention has been made in view of the above conventional circumstances.
It is an object of the present invention to provide a subscriber wireless communication system that reasonably utilizes the advantages of the MA system and the MCA system.

[Means for Solving the Problems] The present invention is a subscriber wireless communication system that compensates for both of these drawbacks and efficiently accommodates subscriber terminals scattered over a very wide range. Non-turning line control device for concentrating and converting multiple subscriber lines into multiplex digital signals having a number of transmission channels smaller than the number of the subscriber lines, and converting the multiplex digital signals into time division multiplex frames together with line control signals. A base station equipped with a baseband control device and a transmission / reception device that modulates or demodulates time-division multiplexed frame-multiplexed digital signals, and a demand-assignment method of joining the base station and a plurality of subscriber stations by radio lines In the user wireless communication system, a transmission / reception circuit that modulates or demodulates the time-division-multiplexed multiplexed digital signal to the subscriber station and the time-division-multiplexed frame The line control circuit that performs call connection control by the line control signal of the multiplex digital signal and the arbitrary transmission channel signal of the time division multiplex framed multiplex digital signal demodulated by the transmission / reception circuit are separated or converted into individual transmission signals or A plurality of conversion circuits for reverse conversion, a plurality of transmitters / receivers for converting or reverse conversion of individualized transmission signals into predetermined carrier channels, and transmission channels to be converted by the conversion circuits based on control commands from the line control circuit. And a subscriber line control circuit for controlling a carrier channel to be used, the subscriber station and the subscriber terminal are line-connected by a multi-channel access method via a carrier channel group, and a call connection request of the subscriber terminal is made. Is converted into a line control signal of a time division multiplex framed multiplex digital signal by a conversion circuit and a subscriber line control circuit and sent to a radio line control device of a base station. It is, and performs wireless communication between the subscriber terminal and the subscriber line under control of the radio network controller.

That is, in the present invention, while basically adopting the TDM / TDMA method, the connection from each subscriber station to a large number of scattered subscriber terminals adopts the MCA method, and the line connection control as a whole is performed by the radio of the base station. The line control device provides a system in which both are integrated.

EXAMPLES Next, the present invention will be described with reference to the drawings.

FIG. 1 is a block diagram showing an embodiment of the present invention. Radio link control device 101 and baseband control device 1 in base station
02 and the wireless transmission / reception device 103 have the same configuration as the base station of the conventional TDM / TDMA system. Further, in the configuration of the subscriber station, the transmission / reception circuit 201, the line control circuit 202 and the subscriber circuit 20.
3 has the same configuration as the subscriber station 104 of the conventional example. In the subscriber station, an MCA method conversion unit 600 is added to accommodate a remote individual subscriber terminal. The subscriber line control circuit 604 receives the M command according to the control command 202 from the line control circuit 202.
It has a function of converting to call connection control with the subscriber station 404 'in the CA method. For example, in the case of an incoming call, the subscriber line control circuit 604 receives the designated channel number on the TDM frame and the subscriber terminal number, and designates the designated channel signal on the TDM frame to replace the signal on the empty carrier channel (fj). Conversion circuit 601-J for converting the individual transmission signals 20-J
Is controlled by the control signal 23 to establish a line connection with the subscriber station 404 'from the transmission / reception circuit 602-J through the carrier channel fj.
603 is an antenna duplexer for each of the transmission / reception circuits 602-1 to 602-K.

Next, a call connection procedure according to this embodiment will be described. The call connection by the TDM / TDMA method is as follows. Fourth showing the frame structure
In the figure, when each subscriber station originates a call from itself, the base station radio channel controller 101 uses the downlink (base station → subscriber station) channel control channel (C-CH) to access.
Specifies one or more empty transmission channels and always notifies each subscriber station. Therefore, in the case of calling a subscriber station, the subscriber station number and the call request signal are transmitted using the designated channel, and when the base station radio network controller 101 accepts normally, the subscriber station Is allowed to use the channel and another empty channel is designated and notified as an access channel. On the other hand, in the case of an incoming call, the base station wireless line control device 101 uses the line control channel to attach a subscriber terminal number and a transmission channel number, and sends an incoming call request signal. The signal of the designated transmission channel is converted into a subscriber terminal signal and connected to the terminal of the own station.

In the subscriber station in the present invention, the above call connection is
Converted to the method. The access channel information sent on the downlink control channel is sent to the subscriber line circuit 604. The subscriber line control circuit 604 specifies a carrier empty channel fi in the MCA section, sends an idle signal to the transmission / reception circuit 602-1 through the conversion circuit 601-1, and interconnects the access channel and carrier channel in the TDM section. Let Therefore, when a call is made to the subscriber station 404 'having the MCA section, the subscriber station requests the call via this carrier channel,
When the conversion circuit 601-1 detects a call request of the channel via the relay side transmission / reception circuit 602-1, the conversion circuit 601-1 detects it as TDM.
Replace the signal on the frame as it is. When the base station wireless line control device 101 normally receives this call request,
A channel use permission instruction is issued to the subscriber station 404 '. This response signal is notified to the subscriber line control circuit 604 via the line control circuit 202 and the line is connected, and
The access channel is newly updated. The subscriber terminal number and transmission channel number information in the case of an incoming call to the terminal are notified to the subscriber line control circuit 604 via the line control circuit 202,
The control circuit 23 controls the conversion circuit 601-1 to put the information on the empty carrier channel, notifies the terminal subscriber station concerned, and the line connection is established. The response of the terminal subscriber station is connected to the channel on the TDM frame via the transmission / reception circuit 602-1 and the conversion circuit 601-1, and the line connection is completed.

[Effects of the Invention] As described above, the present invention basically employs the subscriber wireless communication system based on the TDM / TDMA system and adds a conversion circuit for converting the connection to the final individual subscriber terminal to the MCA system. In addition, the line control as a whole can be performed by the base station radio line control device so that the TDM / TDMA system can be used.
By utilizing both advantages of the MCA method, it is possible to provide a subscriber wireless communication method that accommodates subscriber terminals scattered over a very wide range very efficiently.

[Brief description of drawings]

FIG. 1 is a block diagram showing an embodiment of the present invention, FIG. 2 is a block diagram showing a conventional TDM / TDMA system, and FIG. 3 is a conventional MCA.
FIG. 4 is a configuration diagram showing a system, FIG. 4 is a conceptual diagram showing an example of a TDM / TDMA radio frame format, and FIG. 5 is a conceptual diagram showing an example of a carrier channel in the MCA system. 100 ... Switch, 101,401 ... Wireless line controller, 102 ... Baseband controller, 103 ... Wireless transceiver, 104,404 ... Subscriber station, 201,501,602 ... Transceiver circuit, 202,502 ... Line control circuit, 203,503 ... … Subscriber circuit, 301 …… Subscriber terminal, 402 …… Radio transmission / reception circuit, 403, 603 …… Antenna duplexer, 601 …… Exchange circuit, 604 …… Subscriber line control circuit.

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Claims (1)

[Claims] 1. A non-turning line control device for concentrating-multiplexing a plurality of subscriber lines from an exchange into a multiplex digital signal having a number of transmission channels smaller than the number of the subscriber lines, and a line control for the multiplex digital signal. A baseband control device for converting into a time division multiplex frame together with a working signal, and a transmission / reception device for modulating or demodulating a time division multiplex framed multiplex digital signal are provided in a base station, and a base station and a plurality of subscriber stations are provided. In a demand-assignment subscriber wireless communication system connected by a wireless line, a transmitter / receiver circuit that modulates or demodulates a time-division multiplexed frame-multiplexed digital signal to a subscriber station and a time-division multiplexed frame-multiplexed digital signal Line control circuit that controls call connection by line control signal, and time division multiplex framed multiplex digital signal demodulated by transmission / reception circuit A plurality of conversion circuits for separating transform or inverse transform any electrical transmission channel signal into separate electrical transmission signal,
Multiple transmitters / receivers that convert or reverse-convert individualized transmission signals into predetermined carrier channels, and control the transmission channels to be converted and the carrier channels to be used by the conversion circuit based on the control command from the line control circuit. A subscriber line control circuit for performing line connection between a subscriber station and a subscriber terminal by a multi-channel access method via a carrier channel group, and a call connection request from the subscriber terminal is converted into a conversion circuit and a subscriber line control circuit. The time-division-multiplexed frame-multiplexed digital signal is converted into a line control signal and sent to the base station radio line control device, and the radio communication between the subscriber line and the subscriber terminal is controlled by the radio line control device. A subscriber wireless communication system characterized by performing.