JPH0244938A - Digital subscriber radio transmission system - Google Patents

Abstract

PURPOSE:To improve the line quality and flexibility without losing the economy and simplicity of the system of an opposite party by using the demultiplex/ multiplex rule so as to accommodate lots of subscribers in one radio carrier efficiently. CONSTITUTION:A subscriber signal demultiplex/multiplex processing section 12 consists of demultiplex sections and multiplex sections corresponding to transmission capacities #1-#6 to apply demultiplex processing of a multiple of N (N is an integer) of the minimum capacity of the digital transmission service offering a subscriber signal converted sequentially in the radio frame at an inter-station interface section 11 to the user. Thus, the user signals of subscriber stations subjected to demultiplex/multiplex are accommodated efficiently by the inter-station interface section 11. Thus, the opposite subscriber radio transmission system is obtained, in which the change in the user number of a subscriber station capable of accommodating or the transmission capacity of the subscriber confirmed once is coped with flexibly without losing the economy and simplicity of the opposite system with high quality and rich in the flexibility.

Description

[Detailed Description of the Invention] [Field of Industrial Application] The present invention relates to a digital subscriber wireless transmission system, and in particular to a base station that constitutes one end of a digital transmission network and a base station installed on the user side of a digital transmission service. This invention relates to a digital subscriber wireless transmission system that connects subscriber stations via wireless lines.

[Conventional technology]

Conventional subscriber wireless transmission systems use wide-angle beam antennas at the service stations (base stations) of telecommunications carriers that provide digital transmission services to time-division multiplex multiple subscribers using the same wireless carrier frequency. T DMA accommodated by connection
In practical use, two systems have been put into practice: one is a base station and one subscriber, and the other is a counter system that uses a pair of radio carrier frequencies for each subscriber.

[Problem to be solved by the invention]

In the conventional TDMA system described above, when the number of subscribers with large service capacity increases, the efficiency of accommodating subscribers decreases.

Furthermore, if the distance to the subscriber station is long due to the wide-angle directional antenna characteristics, there is a problem in that the line quality deteriorates due to the effects of rain, snowfall, etc.

On the other hand, the conventional two-way system has a relatively large transmission capacity and is most suitable for long distances.

However, as the number of subscriber stations increases, the radio carrier frequency also increases, resulting in a decrease in frequency utilization efficiency.

Another problem is that flexibility is lacking when the number of subscribers increases or the transmission capacity of a particular subscriber changes.

From this point of view, in large cities it is common for both of the above methods to be used together. However, in emerging cities in rural areas, the number of base stations that can be established is small, or the distance between the subscriber stations 1 and 1 is often long, so a two-way system has to be used.

By efficiently accommodating a large number of subscribers on one radio carrier wave, the present invention can compensate for the shortcomings of the conventional two-way system without sacrificing the economy and simplicity of the two-way system described above. It seeks to provide an effective digital subscriber wireless transmission system.

[Failure to solve the problem]

The present invention provides a digital subscriber wireless transmission system that connects a subscriber station installed on a user side of a Dinocle transmission service and a base station forming one end of a digital transmission network via a wireless line, in which the base station connects the digital Means for mutually converting a time division multiplexed signal input from a transmission network and a radio frame signal, and means for separating and multiplexing the radio frame signal into integral multiples of the minimum capacity of the digital transmission service of the user of the subscriber station. and means for transmitting and receiving the demultiplexed and multiplexed signals to and from the wireless transmitting and receiving device of the base station, and the subscriber station includes a wireless transmitting and receiving device of the subscriber station connected to the base station by a wireless carrier wave. and a means for transmitting and receiving signals to and from the base station, extracting the information of each user assigned to each division of the time-division signal sequence of the radio frame signal sent from the base station, and converting it into an interface signal with the user. The present invention is characterized by comprising a subscriber station terminal device including means for transmitting signals, and means for multiplexing and combining signals from each user according to the separation classification determined by the base station and transmitting the signals to the base station.

[For production]

According to the digital subscriber radio transmission system of the present invention, the base station separates the time-division multiplexed subscriber station signals input from the digital transmission network into integral multiples of the minimum capacity of the digital transmission service. Signal transmission processing is performed independently for each user of the subscriber station facing each separation division, and after converting into a radio frame, the base station transmits and receives the signal using a pair of radio carrier frequencies and a highly directional antenna. On the other hand, each user of the subscriber station extracts the information assigned to each division in the time-division signal stream from the base station, and communicates with the user. 5) When converting the signals from each user into a radio frame, the signals from each user are sent out only during a predetermined period of the pre-allocated signal stream division, and the signals from the subscriber station are transmitted. The unit sequentially multiplexes and combines them and transmits them to the base station, and the base station converts each user's signal transmitted on a radio frame into a signal string of the digital transmission network and transmits it.

〔Example〕

Next, the present invention will be described in detail with reference to nine drawings.

FIG. 1 is a block diagram showing the system configuration of an embodiment of the present invention.

First, the base station side will be described. An intra-office signal 101 on the digital transmission network side is connected from the synchronous terminal device to the subscriber radio base station terminal device 1 either directly or via a relay transmission path. This intra-office signal 101 is obtained by multiplexing and combining user signals to each subscriber station in time series, for example, at 64 kb/s, or every integer multiple thereof.

The intra-office interface unit 11 is connected from the base station side to the subscriber direction c (hereinafter referred to as ``downward'').

In addition to performing termination processing to monitor line abnormalities, etc.
Converts the intra-office signal frame to a wireless frame signal. In the direction from the subscriber side to the base station (hereinafter referred to as "upstream") 1, a radio frame signal in which each subscriber's signal is multiplexed and combined is converted into an intra-office frame signal and sent out as an intra-office frame signal.

The subscriber signal demultiplexing/multiplexing unit 12 uses the minimum capacity N(
(N is an integer) times the separation process.

FIG. 2 shows the relationship between separation processing and subscriber signals to be transmitted. Here, it is assumed that the maximum transmittable capacity of the 9-station signal 101 is ≠6. It is assumed that +1 to ≠6 have the following relationship.

That is, as shown in FIG. 2(a), ≠1 is the minimum capacity of the digital transmission ZARPIS, and 1≠2−≠I X 3. Temple 3
41=2X2,414-+3X2,41.5=+4x2
．． 46≠5×4. For example, ≠l = 54 kb
/s, ≠2=192 kb/s, +32384 kb/s.

+, 4 = 7 6 8 kb/s, +5 =
1536 kb/s, ≠66 t-44k
b/s.

Based on these relationships, the nine intra-station signals 101 are separated into four 4P5s in order from the beginning as shown in FIG. 2(b),
Each +-5 becomes two +-4s from the beginning, each ≠4 becomes two ≠3s from the beginning, and each ≠3 becomes two ≠2s from the beginning,
Each ≠2 is divided into three ≠1s from the beginning. Then, by performing multiplexing and combining processing commensurate with the subscriber capacity to be transmitted, dinotal transmission services are provided to each of a plurality of users within the subscriber station. In order to perform such digital transmission services, the subscriber signal demultiplexing and multiplexing processing unit 12
As will be described later, it consists of a multiplexing section and a separating section corresponding to ≠1 to 4P6, respectively.

With reference also to FIG.
(≠6) is divided into four +5s. If the user's transmission capacity is 6144 kb/s (+6), the intra-office signal 101 is passed through the subscriber signal separation/multiplexing section 12 and transmitted to the radio transceiver interface section 13. If the user's transmission capacity is 1536 kb/s (+5) or less, the subscriber signal demultiplexing/multiplexing processing section 12 performs the following demultiplexing/multiplexing processing. +5 each (1,536k
b/s) is 24 +1. (64kb/s)
or 8 ≠ 2 (192 kb/s) or 4 +
3 (384kb/s) or 2≠4 (76
8 kb/s). Also, +5 to 54 kb
The channel is divided into 24 channels in units of /s, and the numbers are given from the beginning.

The third example shows the transmission capacity of each user and the location and order in which they should be accommodated.
As shown in the figure.

+5 with 768 kb/s and 192 kb/s with 6/
When transmitting digital signals of three users with a transmission capacity of 1 kb/s, 768 kb/s is accommodated in channel number CHA 1, 192 kb/s is accommodated in channel number CH 13, and 64 kb/s is accommodated in channel number CH 13. s is accommodated in the channel number CH plate 19.

FIG. 4 shows an example of the configuration of the subscriber signal demultiplexing/multiplexing processing section 12, which includes demultiplexing sections and multiplexing sections corresponding to ≠1 to ≠6. The respective demultiplexers and multiplexers for each user are directly connected without the need for demultiplexing and multiplexing that is less than their own transmission capacity. For example, 7
68 kb/s directly connects the separating section and multiplexing section of ≠4 in the accommodation position corresponding to the corresponding channel number, and 192 kb/s
Similarly, for /s, the accommodation position corresponding to the corresponding channel number is ≠
The separating section and the multiplexing section of No. 2 are directly connected. Also, 64 kb/
s are accommodated in order. By accommodating with such a separation/multiplexing ratio, later changes can be made easily. That is,
192 kb/s can be changed to 334 kb/s without affecting other users, and 64 kb/s can be changed to 1
．． It is possible to change the speed to 92 kb/s or 384 kb/s.

As described above, by using the separation/multiplexing ratio of the present invention, signals of each user's transmission capacity can be efficiently accommodated with a simple configuration.

Returning to FIG. 1, the wireless transceiver interface unit 13 multiplexes frame synchronization bits and the like to convey reference timing for signal processing at the subscriber station.

A status bit for conveying the status of the digital transmission network, etc. and a radio maintenance bit, which is a control bit from the base station side such as a return test, are inserted. or.

To monitor the line quality of the wireless section, code errors are multiplexed, and scrambling processing is performed to smooth out the trams of the wireless signal and make it easier for the subscriber station to extract the clock signal. and then sends it to the wireless transmitting/receiving device 2.

Next, the subscriber station side will be explained. The subscriber signal from the wireless transceiver device 3 on the subscriber station side is input to the wireless transceiver interface section 41 of the subscriber wireless subscriber station terminal device 4, and information on each user of the subscriber station and wireless maintenance bits are extracted. The wireless section is then terminated. The subscriber signal multiplexing unit 42 passes only the subscriber signals transmitted in the radio frame 2 according to the above-mentioned separation classification, and passes the signals of other subscribers through a mask or the like for security. After performing the suppression process, it is sent to the user interface unit 43.

On the other hand, the upstream signal from the user interface section 43 is
The subscriber signal multiplexing processing unit 42 performs multiplexing and combining according to the above-mentioned separation classification.

FIG. 5 shows an example of the configuration of the subscriber signal multiplexing section 42,
It consists of multiplex parts corresponding to ≠1 to ≠6.

The user interface section 43 receives the signal on the radio frame from the subscriber signal multiplexing section 42, mutually converts it into a signal frame and speed suitable for the transmission speed of each user, and exchanges the signal between the user terminal and the user terminal. interface signal 102;

FIG. 6 is a diagram showing the diversity of Dinotal transmission services for each user at a subscriber station when the system of the present invention is applied.

〔Effect of the invention〕

As explained above, according to the present invention, user signals of subscriber stations separated and multiplexed can be efficiently accommodated on a single intra-station interface. Therefore.

Compared to conventional two-way subscriber wireless transmission systems, the subscriber signal separation method of the present invention not only allows for more flexible response to changes in the number of users at subscriber stations that can be accommodated and changes in the transmission capacity of subscribers once determined. A major advantage of the two-way system is that the multiprocessing unit can be expanded in response to user changes or additions. This has the effect of providing a high-quality, highly flexible two-to-one subscriber wireless transmission system without sacrificing economy or simplicity.

[Brief explanation of the drawing]

Fig. 1 is a system configuration diagram of an embodiment of the present invention. Fig. 2 is a diagram for explaining the relationship between demultiplexing and subscriber signals of the present invention, and Fig. 3 is a diagram showing the demultiplexing side of the present invention. 4 is a block diagram of a subscriber signal demultiplexing and multiplexing processing unit according to the present invention; FIG. 5 is a block diagram of a subscriber signal multiplexing and processing unit according to the present invention; FIG. The figure is a system diagram showing the diversity of digital transmission services when the present invention is applied. 101... Intra-office signal, 1... Subscriber radio base station terminal device, 11... In-office interface section, 12... Subscriber signal separation/multiplex processing section, ? 3.4]...Radio transceiver interface section, 2, 3... Radio transceiver device 14
. . . Subscriber wireless subscriber station terminal device, 42 . . . Subscriber signal multiplex processing section, 43-. . User interface section 1
02...User interface signal.

Claims (1)

[Claims] 1. In a digital subscriber wireless transmission system in which a subscriber station installed on the user side of a digital transmission service and a base station forming one end of a digital transmission network are connected via a wireless line, the base station means for mutually converting a time division multiplexed signal and a radio frame signal input from a network; and means for separating and multiplexing the radio frame signal into integral multiples of the minimum capacity of the digital transmission service of the user of the subscriber station; The subscriber station is provided with a base station termination device including means for transmitting and receiving the separated multiplexed signal to and from the wireless transmitting/receiving device of the base station, and the subscriber station is connected to the wireless transmitting/receiving device of the subscriber station connected to the base station by a wireless carrier wave. A means for transmitting and receiving signals, and extracting the information of each user assigned to each separation section of the time-division signal sequence of the radio frame signal sent from the base station, converting it into an interface signal with the user, and transmitting it. Digital subscriber wireless transmission characterized by comprising a subscriber station terminal device including means and means for multiplexing and combining signals from each user according to separation classifications determined by the base station and transmitting the signals to the base station. method.