JPH03243026A - Polling processor in mobile communication system - Google Patents

Abstract

PURPOSE:To shorten time required for polling by allowing a supposed mobile station to decide the communication zone of a base station pressing a transmit ter and executing polling transmission to mobile stations existing in other com munication zones. CONSTITUTION:When a polling waiting mobile station checking means 1a detects the existence of a polling waiting mobile station, a polling enable base station excluding a base station to which a polling response may be transmitted from a mobile station by pressing a transmitter is selected out of respective base stations 11 to 18 based upon the past polling history. When the polling enable base station exists, a polling transmitting means 1b transmits polling to one mobile station selected out of polling waiting mobile stations included in the communication zone of the base station concerned and sets up the movible station concerned to a polling completed state, then a polling timing waiting means 1c is transferred to a polling timing waiting sate. When no polling enable base station exists, the polling waiting mobile station is immediately transferred to a polling timing waiting state.

Description

[Detailed Description of the Invention] [Field of Industrial Application] The present invention relates to a mobile communication system in which a plurality of mobile stations and a control station that move between a plurality of communication zones communicate via a base station using a polling procedure. The present invention relates to a polling processing device.

[Conventional technology]

FIG. 5 is a block diagram showing a polling processing device in a conventional mobile communication system. In the figure, 1 is a control station that controls the entire mobile communication system, and 11
1 to 18 are base stations that are arranged at nine predetermined intervals, such as along a railroad track, and have predetermined communication zones, and are each connected to the control station 1 by a line. Mobile stations 111 to 183 are mounted, for example, on trains running on railway tracks, and perform wireless communication while moving between the communication zones of the base stations 11 to 18.

In addition, within the control station 1, 1a is the mobile station 111 to 18
1b is a polling waiting mobile station checking means for determining whether or not there is a mobile station waiting for polling in 3, and when a polling 'fF mobile station is detected by this polling waiting mobile station checking means 1a, It is a polling transmission means that performs polling transmission to the polling Samurai mobile station. Reference numeral 10 denotes polling timing control means that waits until the next polling timing when polling transmission is completed, and the polling processing device includes each of these means 1a to 1a.
1c.

Next, the operation will be explained. Here, FIG. 6 is a flowchart showing the procedure of the polling transmission process, and FIG. 7 is a time chart showing the polling timing.

The control station 1 first performs initial settings for polling transmission (step 5TI), and then uses its polling waiting mobile station checking means 1a to check whether there is a polling waiting mobile station among the mobile stations 111 to 183 (step 5TI). Step ST2). If there is a mobile station waiting for polling, the polling transmitter 1b transmits polling to the mobile station to set the mobile station in a polling completed state (step ST4), and further sends the polling timing handle [1
At step c, the process shifts to a polling timing waiting state (step 5T5). In addition, all mobile stations 111 to 183 have already been shibored, and if there are no mobile stations waiting for polling, all the mobile stations are set to the waiting state for polling. (Step 5T6), and shifts to a polling timing waiting state (Step ST5).

In the polling timing waiting state, the polling timing timer times out when the polling interval (Tp, ) shown in FIG. Ru. Here, the polling interval (T
, □) are set in advance to be longer than the time length (tTX) during which the mobile stations 111 to 183 press their transmitters to transmit polling responses.

[Problem to be solved by the invention]

Since the polling processing device in the conventional mobile communication system is configured as described above, all mobile stations are
The polling time required for polling is approximately 6 times, which is simply the sum of the mobile station's transmitter press times.
D. In a mobile communication system that communicates with a large number of mobile stations,
A frequent problem was that the polling interval for each mobile station became long, resulting in an extremely low data transmission efficiency.

This invention was made to solve the above problems, and even when polling a large number of mobile stations is required, the time required for polling is shorter than simply adding up the transmitter pressing time of each mobile station. The purpose of this invention is to obtain a polling processing device in a mobile communication system.

[Means to solve the problem]

The polling processing device in the mobile communication system according to the present invention is capable of polling according to the polling history up to that point when a polling waiting mobile station is detected by the polling waiting mobile station check means for determining the presence or absence of a polling waiting mobile station. A pollable base station selection means for selecting a base station is provided, and the polling transmitting means performs a calling transmission via the base station when a pollable base station is selected. When it is determined that there is no data, and when polling transmission is completed, the polling timing waiting means causes the polling timing waiting means to wait until the next polling timing.

[Effect]

The polling processing device in the mobile communication system according to the present invention sets the polling interval, which is the interval between polling from the control station to the mobile station, to be less than the transmitter press time in the mobile station, and Determine the communication zone of the base station in which the assumed mobile station is transmitting from the polling history up to and perform polling transmission to mobile stations existing in communication zones other than the communication zone of the base station. From this, it is possible to realize a calling I/J processing device in a mobile communication system that can shorten the polling time by the sum of transmitter press times of mobile stations.

〔Example〕

An embodiment of the present invention will be described below with reference to the drawings. 1st
In the figure, 1 is a control station, 11 to 18 are base stations, and 111
183 is a mobile station, and 1a is a polling waiting mobile station check means, which are denoted by the same reference numerals in FIG. 5 and are the same or equivalent parts as those in the conventional system, so a detailed explanation will be omitted.

Further, in the control station 1, when a polling Samurai mobile station is detected by the polling Samurai mobile station checking means 1aK, the control station 1d selects a pollable base station from each of the base stations 11 to 18 according to the polling history up to that point. This is pollable base station selection means. 1b is polling transmission means, pollable base station selection means 1
This method is different from the conventional method in that when a pollable base station is selected in step d, polling transmission is performed via the pollable base station. 1c is a polling timing waiting means, which waits for the next polling timing when the pollable base station selection means 1d determines that there is no pollable base station and when the polling transmission means 1b finishes polling transmission. It differs from the conventional method in that it is in a waiting state.

The polling processing device in the mobile communication system according to this embodiment has a configuration including each of these means 1a to 1d.

Next, the operation will be explained. Here, FIG. 2 is a flowchart showing the procedure of the polling transmission process, and FIG. 3 is a time chart showing the polling sequence.

As in the conventional case, first, the initial setting is performed by TIK in step 5, and then the polling samurai mobile station checking means 1a
At step ST6, the presence or absence of a mobile station waiting for polling is checked (step 5T2), and if there is no mobile station waiting for polling, a polling (-cycle) termination process is executed at step ST6.

On the other hand, when the existence of a polling waiting mobile station is detected by the polling waiting mobile station check means 1a, a mobile station is selected from among the base stations 11 to 18 at that time to select a transmitter based on the polling history up to that point. Base stations that can be polled are selected, excluding base stations that may be pressing and transmitting polling responses (step ST3). When a pollable base station exists, the polling transmission means 1b performs polling transmission to one mobile station selected from among the polling waiting mobile stations existing in the communication zone of the base station, and the mobile station is set to a polling completion state (step ST4), and the polling timing waiting means 1c shifts to a polling timing waiting state (step ST5). If there is no pollable base station, the polling timing waiting means 1c immediately shifts to a polling timing waiting state without polling transmission (step ST5).

For example, at the next polling timing when the mobile station 121 existing in the communication zone of the base station 12 is polled in FIG. Therefore, polling transmission is not performed to mobile stations 111 to 132 existing in each communication zone of base station 1112.13. Furthermore, when polling is transmitted to the mobile station 141 existing in the communication zone of one base station 14, when the mobile station 141 moves to the communication zone of the base station 13, the mobile station 121 moves to the communication zone of the same base station 13. and mobile station 1
Since there is a possibility that the polling responses of the base station 21 and the mobile station 141 will collide, polling transmission is not performed even to mobile stations existing in the communication zone of the base station 14. Therefore, at the next polling timing after the polling transmission to the mobile station 121, among the mobile stations existing in the communication zone of the base stations 15-18 excluding the base stations 11-14, for example, as shown in the figure, the communication of the base station 15 is Polling transmission is performed to mobile stations 151 existing in the zone.

In the polling timing waiting state, the polling timing timer times out when the polling interval (T, .) shown in FIG. Ru. In this case, the polling interval (Tpo)
fi Unlike the conventional case, the time length (tTx) during which the mobile stations 111 to 183 press their transmitters to transmit polling responses is also set short.

Although the above embodiment shows a case where the polling interval (Tpo) is fixed, in a communication method in which the control station 1 transmits data other than polling to the mobile stations 111 to 183, the transmission frequency of that data may vary. Polling interval depending on (
Tp(t)) may be changed over time.

FIG. 4 is a flowchart showing a polling transmission processor j'@ that changes the polling interval (Tpo(t)) over time. In the polling transmission process according to this flowchart, when the polling waiting mobile station check means 1a determines that there is a polling waiting mobile station, first the interval (Tpo(t)) from the previous polling transmission is
) is the transmitter pressing time length (tT) of the mobile stations 111 to 183
x), step ST8), polling interval (
'r,o(t)) is less than or equal to the transmitter press time length (tTX), the process moves to step ST3, where the pollable base station selection means 1d selects a pollable base station. Interval (Tpo(t
)) exceeds the transmitter press time length (tTx), the process moves to step ST4, and the polling transmitting means 1
Immediately execute polling transmission in step b.

Furthermore, in the above embodiment, the case where the traveling directions of the mobile stations 111 to 183 are uncertain has been described;
When 183 is installed on a train, for example, its direction of travel is generally known by the train number or operation number, so the pollable base station selection means 1d utilizes this feature. By selecting pollable base stations in step 1, it is possible to further shorten the time required for polling.

〔Effect of the invention〕

As described above, according to the present invention, the polling interval is set to be less than the transmitter press time at the mobile station, and at each polling timing, the mobile station assumed based on the polling history up to that point is the transmitter. Since the configuration is configured to determine the communication zone of the base station being pressed and perform polling transmission to mobile stations existing in other communication zones, if polling of a large number of mobile stations is required. However, it is possible to obtain a polling processing device in a mobile communication system that can make the time required for polling shorter than the integration of the transmitter pressing time of the mobile station.

[Brief explanation of drawings]

FIG. 1 is a block diagram showing a polling processing device in a mobile communication system according to an embodiment of the present invention, and the second factor is a flowchart showing the procedure of the polling transmission processing,
FIG. 3 is a time chart showing the polling sequence, FIG. 4 is a flowchart showing the procedure of polling transmission processing in another embodiment of the present invention, and FIG. 5 is a block diagram showing a polling processing device in a conventional mobile communication system. , FIG. 6 is a flowchart showing the procedure of the polling transmission process, and FIG. 7 is a time chart showing the polling sequence. 1 is a control station, 11 to 18 are base stations, 111 to 183 are mobile stations, 1a is polling waiting mobile station checking means, 1b is polling transmitting means, 1c is polling timing waiting means, and 1d is polling possible base station selecting means. In addition, the same symbols in the figures indicate the same or equivalent parts.

Claims (1)

[Claims] Is there a mobile station waiting for polling among the multiple mobile stations that are moving between the communication zones of multiple base stations connected to the control station via a line and performing wireless communication with the base station? polling waiting mobile station checking means for determining whether or not the mobile station is waiting for polling;
pollable base station selection means for selecting the pollable base station according to the polling history up to that point when a mobile station waiting for polling is detected by the polling waiting mobile station checking means; and the pollable base station When a base station that can be polled is selected by the selection means, there is a polling transmission means that performs polling transmission to the mobile station via the base station, and if there is no base station that can be polled by the pollable base station selection means. A polling processing device in a mobile communication system, comprising polling timing waiting means for waiting until the next polling timing when a determination is made and when polling transmission by the polling transmission means is completed.