JPS59100650A - Polling system - Google Patents

Abstract

PURPOSE:To reduce the polling time by transmitting a polling signal designating the district point signal of a sign post in a desired range from a base station and starting mobile stations in plural sign post areas to perform response. CONSTITUTION:The base station transmits polling signals Xmin, Xmax, Ymin, Ymax designating the range of district point signals X, Y transmitted from the sign post. The area signal and the district point signal from the sign post are received by a receiver F of a mobile station, demodulated by a sign post signal receiving section 4 of the communication control section G, and when the area signal is coincident with the area of the own station, the district point signals X, Y are stored in storage sections 11, 12. When the polling signal is received by a receiver D, demodulated by a polling signal receiving section 2 of the device G and stored in storage section 7-10. Comparison sections 13-16 compare the district point signal and the polling signal and when an AND circuit 17 discriminates that the district point signal is in the range of the polling signal, the mobile station transmits the station number signal from a transmitter E.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention provides an AVM system (Automatic Vhi
This paper relates to an improvement in the polling method of the ecleMonitoring System.

The distributed transmission AVM system installs radio location land stations (hereinafter referred to as signposts) that transmit local signals and point signals with very low transmission power in various locations in urban areas, and mobile stations receive the local signals and point signals.1- By doing so, the location of the own station is detected. In addition, as a method for detecting mobile stations located in each signpost area on the base station side, a mobile station located in the relevant signpost area, that is, a regional signal and a point signal of the relevant signpost are received and stored. There is a method of polling only the mobile station and having the station number of that mobile station returned. Also, if this polling method is adopted for taxi AVM,
In order to quickly detect empty cars, a method is adopted in which each mobile station is divided into groups, time slots are assigned to each of nine groups, and each group responds sequentially.

However, such a polling method polls only one arbitrary area, and for example, the total number of empty cars decreases, and it is necessary to detect empty cars in multiple areas, including neighboring areas, in addition to the area concerned. In this case, polling is performed sequentially, which wastes time.

The present invention makes it possible to poll multiple arbitrary signpost areas at once in a distributed transmission type AVM system, thereby shortening the polling time.

FIG. 1 shows how to determine the point signal of a sign post, where X is expressed as a three-digit value based on the longitude difference from the reference point ST to the sign post SP. Further, Y is expressed as a three-digit numerical value based on the latitude difference from the reference point ST to the sign post SP.

In other words, the farther the distance from the reference point ST to the sign post SP becomes, the larger the values of X and Y become.

Figure 2 shows the point signals sent from the sign post, X,
Both Y and BCD are sent in 3 digits. In addition, point signal x,
For a detailed definition of y, please refer to the Ministry of Posts and Telecommunications Radio Control Bureau's Circular No. 60 dated June 13, 1980 [Regarding the processing policy for license applications for radio stations related to automatic vehicle position display systems (Notice)] is shown.

FIG. 3 shows an example of two boring signals according to the present invention, where Xmjn and Xmax specify the range of x and y.

Ymjn and Ymax are each transmitted as 3-digit numbers.

Figure 4 shows the configuration of the mobile station, where A is the antenna;
B is an antenna duplexer, and C is a transmitter/receiver switcher.

D is a receiver, E is a transmitter, F is a receiver, and G is a communication control device.

・FIG. 5 shows an example of the communication control device G of the present invention, where ■ is a connection terminal with a receiver, 2 is a polling signal receiving section, and 3 is a connection terminal with a receiver F.

Reference numeral 4 indicates a sign post signal receiving section, 5 indicates a connection terminal with the transmitter E, and a 6-digit station number transmission control section. 7 to 10 are bowling signal storage units, 7 is Xm1n, 8 is Xmax,
9 stores Ymin, and 10 stores Ymax. 11 and 12 are sign post signal storage units.

11 stores X and 12 stores Y. 13 to 16 are comparison sections, 13 is the condition of Xm1n<X, 14 is the condition of Xmax>-X, 15 is the condition of Y min <Y, and 16 is the condition of Y
Each signal is output under the conditions of max and Y. 17 indicates an AND circuit.

Next, the operation will be explained.

Regional signals and point signals from sign posts.

Received by antenna A, antenna duplexer B, and receiver F,
It is input to the communication control device G through the connection terminal 3. This received signal is demodulated by the sign post signal receiving section 4, and if the local signal matches the area of the own station, the point signal is stored in the sign post signal storage sections 11 and 12 with 3 digits of X and Y, respectively. do. On the other hand, the boring signal is transmitted by antenna A.
, is received by the antenna duplexer B and the transmit/receive switch C1 receiver, and is input to the communication control device G through the connection terminal 1.

This received signal is demodulated by the boring signal receiving section 2.

Xm1n in polling signal storage units 7 to 10, respectively.

Store Xmax, Ymin, and Ymax. Then, when the reception of the pointing signal is completed, the comparator 1
3 to 16, comparison of X and Xm1n and Xmax, Y and Y
Compare min and Y max. Comparison section 13 is X
The comparison unit 14 is set to output a signal under the condition of m1n<X, the comparison unit 14 is set to output a signal under the condition of Therefore, each output is judged by the AND circuit 17, and if there is an output for all, a signal is applied to the 2-station number transmission control section 6, and the station number signal is sent to the connection terminal in the slot assigned to the own station. 5. The signal is transmitted to the base station via the route of transmitter E, transmission/reception switch C, antenna duplexer B, and antenna A. Further, if there is no output in any one of the comparators 13 to 16, no signal is applied to the 9-station number transmission control section 6, so that the 2-station number is not transmitted.

Therefore, X min , X of the boring signal
By selecting max, Y min and Y max, it is possible to specify the mobile station to which the 9-station number is to be sent back.

Note that X min =X max and Y min
= Y max, only mobile stations that meet one condition will return their station numbers.

As explained above, according to the polling method of the present invention, it is possible to arbitrarily perform polling of only one arbitrary signpost area or polling of a combination of a plurality of signpost areas, and the above-mentioned problems can be eliminated.

[Brief explanation of drawings]

Figure 1 shows how to determine the sign post point signal, Figure 2 shows the point signal transmitted from the sign post, Figure 3 shows the polling signal of the present invention, Figure 4 shows the configuration of the mobile station, and Figure 5 shows the method of the present invention. A communication control device is shown. A: Antenna, B: Antenna duplexer, C: Transmission/reception switch, D: Receiver, E: Transmitter, F: Receiver. G: Communication control device. 1: Receiver connection terminal, 2: Polling signal receiving section, 3:
Receiver connection terminal, 4; Sign post signal reception section, 5: Transmitter connection terminal, 6: Station number transmission control section, 7-10: Polling signal storage section, 11-12: Sign post signal storage section, 13-16 : Comparison section, 17: AND circuit. 7-295-

Claims (1)

[Claims] In a distributed transmission AVM system, a base station transmits a polling signal that specifies signpost point signals X and Y within a desired range, thereby activating mobile stations located in multiple signpost areas and causing them to transmit responses. A polling method characterized by collecting data from mobile stations.