JPS59200536A - Establishing method of data link of mobile terminal device - Google Patents

Abstract

PURPOSE:To obtain a data link establishing method which has superior responsiveness by allowing a radio base station to send such a special request to establish a data link that some terminal should answer when receiving it to a mobile terminal which neither transmits nor receive a telegraphic message for a long period. CONSTITUTION:When a request (1) to establish the data link DL is transmitted by using a transmit channel TX of the radio base station 2, the mobile terminal device 3 receives the request (1) by a receive channel RX and makes no answer unless there is a telegraphic message to be sent to the base station 2 an internal processing time (3) later. The base station 2 sends a request (4) to establish the DL to the next device 3 when there is no answer within a specific time. The base station 2 sends such a special request (5) to establish the DL that a receiving terminal should answer when receiving it to the device 3 which neither transmits nor receives a telegraphic message for a long period. The terminal 3 receives the request and sends a DL establishment answer (2) the internal processing time (3) later to show that it is in the service area of the base station 2. The base station confirms its presence and sends a DL establishment request (4) to the next mobile station.

Description

[Detailed Description of the Invention] [Technical Field of the Invention] The present invention provides a method for establishing a data link in a simple wireless mobile terminal device, which is a low-power mobile wireless terminal device that can be handled without a license based on the Domestic Radio Law. Regarding.

[Technical background of the invention and its problems]

FIG. 1 shows a host computer 1, a plurality of mobile terminal devices 3 and f,
One wireless base station (sometimes simply called a base station) 2
1 is a diagram illustrating an example of the configuration of a conventional data transmission system connected wirelessly via.

The mobile terminal device FU 3 used in this example uses a low-power wireless terminal device that can be handled without a license based on the domestic radio law, and will be referred to here as a simple wireless terminal device.

Such conventional mobile terminal equipment (simple wireless terminal equipment)
In No. 3, data was sent and received with the wireless base station 2 using the following two methods. The first method is to allocate frequencies in different bands to each mobile terminal device 3 and
The second method is a method in which the mobile terminal device 3 transmits and receives data to and from the wireless base station 2 in a time-sharing manner for each terminal using the same frequency band. The first advantage of such conventional methods is that each mobile terminal device 3 and the wireless base station 2 are connected using frequencies in different bands, so there is no waiting time and the responsiveness of data transmission and reception is excellent. It's where you are. However, its disadvantages are that, since frequencies in different bands are assigned to each mobile terminal device 3, the connection cost for one terminal increases, and there is a physical limit to the number of terminals that can be connected. On the other hand, the advantage of the second method is that the frequency of the same band is used in a time-division manner, so the connection cost per mobile terminal device 3 is low, and the number of mobile terminal devices that can be connected is low.
There is no physical limit to the number of machines. However, its disadvantage is that since frequencies in the same band are used in a time-division manner, it requires time for each mobile terminal device 3 to establish a data link, resulting in poor responsiveness.

Figure 2 shows a conventional mobile terminal device (simple wireless terminal device) 3 that transmits and receives data in a time-division manner using the same frequency band.
FIG. 2 is an operation time chart showing a method for establishing a data link in FIG. No selection,
The radio base station 2 uses the transmission channel TXe to transmit a data link establishment request (2). Then, the mobile terminal N3 receives the data link establishment request (2) transmitted from the base station 2 using the reception channel RXI. The mobile terminal device 3 then turns off the reception channel RX after internal processing time ■.
After F, a data link establishment response ■ is transmitted using the transmission channel TX. Then, the base station 2 receives the data link establishment response (3) transmitted from the mobile terminal device 3 through the reception channel RX. In such a conventional data link establishment method, when the mobile terminal device 3 is within the service area of the wireless base station 2, there is always a data link establishment response. (generally 59m5
(required) is a time so large that it cannot be ignored with respect to the responsiveness of the radio base station 2 and the mobile terminal device 3, resulting in the above-mentioned disadvantages.

[Purpose of the invention]

In view of the above drawbacks, an object of the present invention is to provide a method for establishing a data link in a mobile terminal device, which has a low connection cost per terminal, has no physical limit on the number of connected devices, and has excellent responsiveness. There is a particular thing.

[Summary of the invention]

The present invention provides a method for establishing a data link in each mobile terminal device in which a wireless base station and a plurality of mobile terminal devices are connected by using the same frequency in a time-division manner. When there is no spot text, even if the mobile terminal receives a request to establish a data link from a wireless base station, it does not respond to the request to establish a data link, thereby shortening the time required to establish a data link. At the same time, for terminals that have not sent or received messages for a long period of time, the wireless base station confirms the existence of the terminal by sending a data link establishment special request to which the receiving mobile terminal must send a data link establishment response. The above objective is achieved by adopting a data link establishment method.

[Embodiments of the invention]

An embodiment of the method for establishing a data link in a mobile terminal device according to the present invention will be described below with reference to the drawings using the same reference numerals as in the conventional example. FIG. 3 is a time chart showing an example of the operation of establishing a data link between a wireless base station and a mobile terminal to which the method for establishing a data link in a mobile terminal according to the present invention is applied. Transmission channel TX of wireless base station 2
Use to send a data link establishment request ■. Then, the mobile terminal device 3 receives the data link establishment request ■ sent from the base station 2 using the reception channel RXI, and
A data link is established in the mobile terminal device 3 after an internal processing time (3). On the other hand, the base station 2 is connected to the mobile terminal device 3.
It is determined that there is no uplink message, and the transmission channel TX is
7. is used to send a data link establishment request (3) to the next mobile terminal device 3.

In this way, when the mobile terminal device 3 of this embodiment does not send an uplink message to the wireless base station 2, it always establishes a data link without responding to the data link establishment request (2) from the base station 2. , which can save time. However, although it is possible to shorten the data link establishment time using only the method shown in FIG. 3, the method shown in FIG. This means that the wireless base station 2 cannot determine whether the mobile terminal device 3 exists within the wireless service area.

Therefore, in this embodiment, as shown in FIG. 4, a method is used in which the wireless base station 2 sends a special data link request to the mobile terminal device 3 that frequently exchanges messages over a long period of time, and confirms its existence. There is.

That is, the radio base station 2 uses the transmission channel TXi to transmit a special data link establishment request (2) to the mobile terminal device 3, which has not been receiving messages for a long time. Then, the mobile terminal device 3 receives the data link special establishment request (■) sent from the radio base station 2 using the reception channel RX, and after the internal processing time (■) in the terminal has elapsed, the mobile terminal device 3 ends the reception operation, and then starts moving. Terminal device 3 is on transmission channel T
A data link establishment response ■ is sent using X. This data link establishment response (2) is received by the reception channel RX of the radio base station 2, and the radio base station 2 confirms the presence of the mobile terminal device 3 within its service area. After that, the wireless base station 2 selects the transmission channel TX? : is used to send a data link establishment request ■ to the next mobile terminal device 3.

The broken line on the transmission channel of the radio base station 2 indicates the transmission of a data link establishment request to the next mobile terminal device 3 when there is no company 0 data link establishment response (2).

In this case, the existence of the mobile terminal device 3 that issued the special data link establishment request (2) could not be confirmed.

As mentioned above, regardless of the presence or absence of an uplink message, the mobile terminal device 3 always responds with a data link establishment response in response to the data link special request (■) of the radio base station 2 when it exists within the service area. Since the radio base station 2 is programmed to perform (2), it is possible to confirm the existence of the corresponding mobile terminal device 3. If there is no data link establishment response (■) from the corresponding mobile terminal device 3 in response to a special data link request, the wireless base station 2 assumes that the corresponding mobile terminal device 3 does not exist within the service area, and The data link establishment request period for the terminal device 3 is made lower than that for other mobile terminal devices, so that the service period for the other mobile terminal devices 3 is increased. Note that a data link establishment request in a format different from a normal data link establishment request is defined as the above-mentioned special data link request.

According to the present embodiment, in response to a data link establishment request (2) from the radio base station 2, if the mobile terminal device 3 that received the request does not have an uplink message, the mobile terminal device 8 responds with a data link establishment request. The time required for establishing a data link can be shortened by not performing this on the radio base station 2. Therefore, the base station 2 can also send a data link establishment request to the next mobile terminal device 3 faster by this reduction. Therefore, the wireless base station 2 and the mobile terminal 3
It is possible to improve the responsiveness between In addition, for a mobile terminal device 3 that has not sent or received a message for a long time, the wireless base station 2 sends a special data link establishment request ■ to the mobile terminal device 3, and the mobile terminal device 3 is located within the service area. If it does not exist, it is possible to increase the service cycle for other mobile terminal devices 3, thereby improving the responsiveness between the wireless base station 2 and the mobile terminal device 3 as a whole. can. Moreover, since this embodiment is a method of transmitting and receiving data to and from a plurality of mobile terminal devices 3 using the same frequency in a time-division manner, the mobile terminal device 3
The connection cost per device can be lowered, and there is no restriction on the number of mobile terminal devices 3 that can be connected to the wireless base station 2.

Although the present embodiment has been described assuming that the mobile terminal device 3 is a simple wireless terminal device, the mobile terminal device is not limited to this simple type. Furthermore, the meaning of the same frequency in the above embodiment can be considered as a multi-drop system using one line, and the presence or absence of a mobile terminal in a service area is determined by the number of times the mobile terminal is turned on.
A similar effect can be obtained even if it is interpreted in a broader sense in correspondence with the F state.

〔Effect of the invention〕

According to the data link establishment method in a mobile terminal device of the present invention described above, in response to a data link establishment request from a wireless base station, if the mobile terminal device that received the request does not have an uplink message, If the data link establishment response from the mobile terminal side to the wireless base station is eliminated, and if the mobile terminal device does not send or receive messages for a long time, the wireless base station sends a data link special establishment request to the mobile terminal to establish the service of the terminal. By confirming the presence or absence in the area, it is possible to lower the connection cost per terminal, eliminate the physical limit on the number of terminals connected, and improve the response between the wireless base station and the mobile terminal. It has little effect on improving sex.

[Brief explanation of drawings]

Figure 1 is a configuration diagram showing an example of a conventional data transmission system in which a host computer is connected to a plurality of mobile terminals via a wireless base station, and Figure 2 is a conventional configuration diagram between a wireless base station and mobile terminals. 3 and 4 are time charts showing an example of the method for establishing a data link according to the present invention between a wireless base station and a mobile terminal device. be. 2-...Radio base station 3...Mobile terminal device agent Patent attorney Noriyuki Chika (and one other person)

Claims (2)

[Claims] (1) In a data link establishment method for each mobile terminal device in which multiple mobile terminal devices are connected to a radio base station by using the same frequency in a time-sharing manner, a data link establishment request is received from the radio base station. When the mobile terminal device does not have an uplink message to the radio base station, the mobile terminal device does not make a data link establishment response to the data link establishment request. The wireless base station will move on to requesting the establishment of a data link to the next mobile terminal, and if the mobile terminal has not sent or received a message for a long time, the radio base station will always send a data link establishment response to the mobile terminal that received the message. 1. A method for establishing a data link in a mobile terminal device, comprising transmitting a data link establishment request that must be established. (2) A patent characterized in that the wireless base station lowers the data link establishment request period for mobile terminal devices that do not respond to a data link establishment special request, and increases the service period for other mobile terminal devices by that amount. A method for establishing a data link in a mobile terminal device according to claim 1.