JPH01261940A - Demand assignment subscriber radio system - Google Patents

Abstract

PURPOSE:To effectively use both radio frequency and radio equipment when the subscriber's station of the data of small transmission capacity is stored by making each subscriber's station recognize the direction of its own station and fetching data by obtaining timing to be received. CONSTITUTION:The data is outputted from an exchange 20 according to prescribed format, and a switching control signal is added to the respective beam antennas of directions A1-D2 at terminal equipment 21. Then, the data is inputted to an interface microselector 23 through a base station radio equipment 22. The selector 23 switches the beam antennas 11a1-11d2 by time division according to the switching control signal in the data from the radio equipment 22 so as to turn them into an operating state respectively. Thus, when the antennas of the respective directions are in the operating state, the synchronizing signals of the respective directions and subscriber data are outputted. These synchronizing signals and the subscriber data are supplied to a subscriber's station terminal equipment 26 through the antenna 24 and through a subscriber's station radio equipment 25, and by making access the data of each subscriber is recognized, and transmitted to a data terminal equipment.

Description

[Detailed Description of the Invention] [Summary] Regarding a demand assignment subscriber radio system that uses a scan beam to demand assign subscriber data for each direction from one base station to subscriber stations existing in multiple directions, When accommodating subscriber stations with small transmission capacity data, antennas are installed in multiple directions in one base station system, and antennas are installed in each direction in order to effectively utilize both radio frequencies and radio equipment. Subscriber data with a different synchronization signal added for each direction is transmitted in a time-divisional manner to each direction angle by switching the antennas in each direction using a common radio frequency, and is sent to subscriber stations in each direction. Then, by receiving a synchronization signal, the base station system recognizes that the base station system is accessing in the direction of its own station, and configures it to import data from its own station at a preset timing determined by the number of bits from the synchronization signal. .

[Industrial Application Field] □ The present invention is a demand system that uses a scan beam to input subscriber data from one base station to subscriber stations located in multiple directions in units of one direction. Regarding the Asain subscription name wireless system. .

The so-called Briasine (PA) allocates a pair of round-trip lines.
) type of subscriber radio system includes 5CPC (component type), in which one base station accommodates only one subscriber station, and TDMA (time division multiplex type), in which one base station accommodates multiple subscriber stations.
Both are mainly used for high-speed digital data dedicated line services. In recent years, with the diversification of network services such as wireless telephones, I
With the start of SDN (integrated service digital network) services, services with small transmission capacity (for example, 192 Kbl) such as basic interface also began to use this subscriber wireless system.

Originally, this subscriber wireless system was developed for high-speed digital data transmission as mentioned above, so 192b
If subscribers of small transmission sound h1 such as PS are accommodated, there will be waste in terms of radio frequency usage efficiency. Therefore,
Even when accommodating subscriber stations with such small transmission sound h1,
It is necessary to increase the utilization efficiency of radio frequencies and make more effective use of radio equipment.

[Conventional technology]

As mentioned above, the S
Cl-'C and D-DMA each have the following formulas:
5 cpc is as shown in FIG. Transmit.

One TDMA, as shown in FIG.
3d is installed, and the transmission capacity and amount of data is, for example, 15 Hbps, between the subscriber stations 4 in the direction to the radio frequency f1.
．． Between the subscriber stations 5 in the f'1.1B direction, radio frequencies 1-2. f'2, and between subscriber stations 6 in the C direction, the radio frequency f3. Between the subscriber stations 7 in the f'3 and D directions, the signal is superimposed on the radio frequency f4° f'4 and transmitted in a time-division manner in each direction. In this case, each base station system 38
~3d are radio frequencies fl, f'I~f4, respectively.
Of course, "l"' 4 can be handled.

[Problem to be solved by the invention]

Both 5cpc and TDMA allow subscriber stations to transmit high-speed data (8Hbps for SCPC, 16Hbps for TD'MA).
There is no particular problem if you are using a service with a small transmission capacity, that is, 64. K11113 or 19
2. When using low-speed data such as bps, only about 1% to 3% of the total transmission capacity is used, which means that the radio frequency is not used effectively and is wasted. there were.

On the other hand, in the case of TDMA, there are eight types of radio frequencies "1 to f/4".
For example, even if there are many subscriber stations in one direction and few subscriber stations in each of the other three directions, it is necessary to use base stations to cover 3606 directions. Station 3 has four base station systems 3a to 3.
d had to be installed, which caused the problem that wireless equipment was wasted.

SUMMARY OF THE INVENTION An object of the present invention is to provide a demand-assign subscriber wireless system that can effectively utilize both radio frequencies and radio equipment when accommodating subscriber stations with small transmission capacity data.

[Means for solving problems]

FIG. 1 shows a diagram of the principle of the present invention, where (A> is a diagram of its principle configuration, and (B) of the same diagram is a transmission data format.

In the same figure ('A), 301. In the case of the present invention, one base station system is installed.

31a, 31b, . . . are antennas installed in a plurality of directions A, B, . . . around the base station system 30, respectively. a#+, a#2.・=, b#+.

... are subscriber line stations that exist in each direction. The present invention
Different synchronization signals FTa for each of the plurality of directions A, B, ...
, FTb, ... subscriber station a#+ in each direction,
Subscriber data A for a #2,..., b#+,...
#l, A#2,..., B#+,... are connected to antennas 31 in each direction using a common radio frequency in each direction.
a, 31b, .
, ... recognizes that the base station system 30 is accessing in the direction of its own station by receiving synchronization signals FTa, FTb, ..., and sends preset synchronization signals FTa, FTb, ...
It is configured so that data of the own station is taken in at a timing determined by the number of bits from b, . . .

(Operation) The base station system 30 uses the transmission data format shown in FIG. 1(B) to transmit anti-)-
31a, 31b, . . . are switched in a time-divisional manner to generate synchronization signals FTa, FTb, . . . for each direction and subscriber data A#1 . △#2. ….

B#1. ... to be transmitted. Each subscriber station a#1, a#2,...
, btt+,..., the synchronization signal FTa transmitted
, FTb, ... recognizes the direction of its own station, and based on this, obtains the timing at which its own station should receive data and captures the data. By doing this, for example, 16H
In TDMA, which has a total transmission capacity of 64 bps, each subscriber station can increase the transmission capacity for all subscriber stations as a whole, making the radio frequency effective. It can be used for. Also, for example, even if there are many subscriber stations in one direction and few subscriber stations in the other three directions, there is only one base station system (), so radio equipment is wasted compared to the conventional example. The equipment can be used effectively.

〔Example〕

FIG. 2 shows an overall configuration diagram of an embodiment of the present invention.

In the figure, 10 is a base station system, one of which is provided in the base station. 11a1 to 11d2 are 45° beam antennas, which are installed corresponding to each direction of A1 direction = 02 direction. In other words, 8 beam antennas
Covers the 0° direction.

The base station system 10 has the configuration shown in FIG. 3(A), and as described later, beam antennas 11a1 to 11d.
2 in each direction in a time-division manner. 1
2 to 15 are subscriber stations in each direction, and have the configuration shown in FIG. 3(B).

There are two radio frequencies used in the present invention: f, , f'.

FIG. 4 shows the format of data transmitted from base station system 10 to subscriber stations 12-15 for use in the present invention.

In this method, each direction is stitched in one unit, and a synchronization signal indicating the direction is added to the beginning of the subscriber data in each direction. For example, there are three subscriber stations 12au to 12a+3 in the A1 direction.
is accommodated, then synchronization No. 15 FTa+ indicating the A+ force direction is added to the beginning of the subscriber data Δ1 #
1, At#2. Al #3 is set. or,
When two subscriber stations 12a21 and 12a22 are accommodated in the A2 direction, a synchronization signal F T 82 indicating the A2 direction is added to the beginning of the subscriber station data A2#I.

A2#2 is set. The subscriber data formats 1 to 1 for directions other than this are also set in the same manner as above, and the overall data format is the data format A shown in FIG.

Next, the operation of the system of the present invention will be explained. Figure 3 (A
>, data is output from the exchange 20 according to the data format not shown in FIG. A control signal is added and supplied via the base station radio 22 to a micro selector 23 which is an interface between the beam antenna and the radio. The micro selector 23 is the radio device 2
The beam antennas 11a1 to 11d2 are switched in a time-division manner according to the switching control signal in the data from 2, and each beam antenna is brought into operation.

As a result, when the beam antenna 11a1 in the A1 direction is in the operating state, the synchronization signal FTa+ and the subscriber data At#+, At#'2 in the A1 direction.

A1 #3 is output, and beam anti-no 11 in the A2 direction
When a2 is in the operating state, the synchronous Ci number FTa in the A2 direction
2 and subscriber data A2 #I and A2 #2 are output, and even when the beam antennas in other directions are in operation, synchronization signals and subscriber data in the respective directions are output in the same manner as above. In this case, the synchronization signal and subscriber data are superimposed on the radio frequency fl 1 and output to subscribers in either direction.

The synchronization signal and subscriber data thus transmitted are transmitted to the subscriber station shown in FIG. 3(B). The data entering the beam antenna 24 is sent to the subscriber station radio 25.
The data is supplied via the subscriber terminal to the subscriber station terminal 26, where it is accessed, the respective data is recognized, and transmitted to the data terminal. That is, each subscriber station 12 in the A1 direction
The subscriber stations au to 12a13 recognize that the data is being accessed in the direction of their own station by the incoming synchronization signal FTa1, and the subscriber stations 12au to 12a+3 transmit the synchronization signal F T
Since the 17th channel from a + to which subscriber f- of the own station is located is set in advance, subscriber station 12au has subscriber data A +'# + and subscriber station 12a has subscriber data A +'# + . Data AI#2 and subscriber station 12ah3 each take in subscriber data AI#3. Access to subscriber stations in other directions is performed in the same manner as described above.

Thus, the data length of the subscriber stations in the same direction corresponds to the number of subscriber stations, and data access is performed only by that number. In this case, the access timing of the subscriber station is determined by the number of bits from the synchronization signal in the direction of the subscriber station, and this is set in advance by a switch or the like in the subscriber station.

In the present invention, by switching the operation of the beam antenna, data transmission is performed using a common radio frequency to all subscriber stations in each direction on one data format. Even if a subscriber station has a small transmission capacity of data at 64 bps or 192 bps, the transmission capacity can be increased and the radio frequency can be used effectively if all subscriber stations are closed.

In this case, in the case of a configuration in which data access is not performed in a certain direction (for example, the B1 and B2 directions), the data in the B1 and B2 directions can be used as data in the other direction to the data format 1 shown in FIG. Radio frequencies can be used efficiently.

Furthermore, in the present invention, only one base station system needs to be installed; for example, if there are many subscriber stations in one direction and few subscriber stations in each of the other three directions, the conventional system always requires Whereas it was necessary to install a base station system in each of the four directions, with the present invention, even in this case, only one base station system is required, and wireless equipment is wasted compared to the conventional example. Furthermore, since the present invention can cover 360 degrees using only two radio frequencies using one base station system, the radio equipment can be made small-scale.

Furthermore, in the present invention, by installing a large number of beam antennas, the radio wave radiation angle can be narrowed, and as a result, if the transmission power is the same as the conventional example, the gain can be higher than that of the conventional example, and therefore the propagation distance #t can be reduced. It can be made longer and can reduce the rain downtime rate and instantaneous line interruption rate.

Furthermore, in the present invention, either 5 cpc or TDMA can be used. For example, if there are a plurality of subscriber stations in the same direction, -rDMΔ service is performed, and if there is one subscriber station in one direction, 5CPC can be used without any data loss. This is because, as is clear from FIG. 4, in the present invention, the data length can be arbitrarily set variably, so that the data length can be set in various ways depending on the number of subscriber stations.

〔Effect of the invention〕

As explained above, according to the present invention, the overall transmission capacity can be increased even when subscriber stations with small transmission capacity data are accommodated, and radio frequencies can be used more effectively than in the conventional example. Even if there are many subscriber stations in one direction and few subscriber stations in the three directions, the radio equipment will not be wasted unlike in the conventional case, and the equipment can be used effectively. On the other hand, when multiple antennas are installed, the radio wave radiation angle from the antenna becomes narrower, so if the transmission power is the same, the gain can be higher.Furthermore, the data length can be set variably according to the number of subscriber stations, so If data is not accessed in one direction, the data can be used for data in another direction, and radio frequency can be used efficiently. It can be operated without waste.

[Brief explanation of the drawing]

Fig. 1 is a diagram of the principle of the present invention, Fig. 2 is an overall block diagram of an embodiment of the present invention, Fig. 3 is a block diagram of the main parts of the present invention, and Fig. 1 is transmission data used in the present invention. Formats 1 to 5, FIG. 5 is a block diagram of the conventional 5cpc system, and FIG. 6 is a block diagram of the conventional TDMA system. In the figure, 10.30 is the base station system l\, 11a1, 11a2 . −． 11d2.24,31a,3
1b,..., 31d are beam antennas, 12.12a++
, 12a12. −． 12a21,-. 13.14,15. a#+, a#2.・=, d#2
20 is a subscriber station, 20 is a switch, 21 is a base station radio line termination equipment, 22 is a base station radio, 23 is a micro selector, 25 is a subscriber station radio, 26 is a subscriber station termination device, FTa+, FTa2. FTb+, FTb2. −. F-d a, F-[b, ... are synchronization signals, Al #+, Al #2, ..., A2 #I, △2 #
2゜..., B+ #1,..., △tt+, A#'2
,...,But. ...indicates subscriber data.

Claims (1)

[Claims] In one base station system (30), multiple directions (
The antennas (31a, 31b, 31b, 31a, 31b, etc.)
), and subscriber stations in each direction (a#_1, a#_2,... ,b#_1,...
) for subscriber data (A#_1, A#_2, ..., B
#_1,...) is transmitted in a time-divisional manner in each direction by switching the antennas (31a, 31b,...) in each direction using a common radio frequency in each direction, and the subscriber station (a #_1,a#_2,...,b#
_1,...) recognizes that the base station system (30) is accessing in the direction of its own station by receiving the synchronization signal (FTa, FTb,...), and is set in advance.
A demand assignment subscriber radio system characterized in that data of its own station is taken in at a timing determined by the number of bits from the synchronization signal (FTa, FTb, . . . ).