JPH10257540A - Bidirectional pager and transmission retry method therefor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve the probability of success in following transmission retry even when the channel of ordinarily low electric reception field is selected by repeating transmission retry operation for confirming the reception of response signal from a base station corresponding to transmission predetermined times. SOLUTION: First of all, a predetermined channel region is scanned, the channel of highest electric reception field is found out, a transmission frequency is locked to that channel (S101) and continuously, a 1st call origination request signal is transmitted (S102). It is monitored for prescribed time whether any response signal is returned from the base station corresponding to this transmission or not (S103), when the response signal can not be confirmed, it is investigated whether the retry is operated less than four times or not (S104), when it is operated less than four times, the channel region is scanned again, the channel of highest electric reception field is found out, and the transmission frequency is locked to that channel. Thus, a call origination request is sent to the channel determined by performing scanning again.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

[0001] 1. Field of the Invention [0002] The present invention relates to a bidirectional pager and a transmission retry method thereof.

[0002]

2. Description of the Related Art FIG. 2 is a block diagram showing a hardware configuration of a bidirectional pager. An MPU 1 for performing overall control processing and a RAM used for storing programs and working areas thereof.
2. ID-ROM 3 for storing its own ID signal, LCD 4 for displaying messages, etc., speaker 5 for notifying incoming calls, etc., switch 6 for selecting power and functions, RF unit 7 for transmitting and receiving radio signals, synchronization signal , A decoder 8 that performs message analysis, and the like, and an antenna 9.

FIG. 3 is a flowchart showing a conventional retry method for calling a two-way pager. First, a predetermined channel area is scanned to find a channel having the highest reception electric field, and a transmission frequency is found. The locked channel is locked (step 301). Then, a call request signal is transmitted to the base station (step 30).
2) Monitor whether a response signal is returned from the base station to the request for a predetermined time (step 303). If the response signal cannot be confirmed, it is checked how many times the call request signal has been transmitted (step 304). If four retries have not been completed, the process returns to step 302 to retry the next transmission. When the response signal from the base station has been received by the fourth time, the process proceeds to the next sequence, that is, the transmission process of the dial signal and the subsequent message. If the response signal has not been received yet even after four retries, the call fails, and the call request processing ends.

[0004]

In the above-mentioned conventional transmission retry method, a channel which has a high electric field momentarily due to noise or the like during the first channel scan is selected, and the transmission frequency is locked to this. There was something. However, when the noise or the like disappears, the reception electric field level is low, and when the channel is locked to a channel in which communication cannot be performed on that channel, there is a high probability that both transmission retries will fail.

An object of the present invention is to provide a bidirectional pager which has a high probability of succeeding in subsequent transmission retries even when a channel having a low reception electric field is selected in a steady state due to the influence of noise or the like during a first channel scan. To provide an interactive pager having such a method.

[0006]

SUMMARY OF THE INVENTION The present invention is a transmission retry method for establishing a channel with a base station at the time of a call in a two-way pager having both functions of transmitting and receiving a call. A transmission retry operation of detecting a channel having the highest reception electric field by a channel scanning process, transmitting a call request signal through the channel, and further confirming reception of a response signal from the base station for the transmission is performed in advance. If the response signal can be received before repeating the retry count, the operation shifts to a call transmission operation using the channel used at that time, and the response signal cannot be received even if the transmission retry operation is repeated up to the number of retries. A transmission retry method for a two-way pager, characterized in that when a call fails, the processing is terminated as a call failure.

Further, the present invention is a bidirectional pager having both functions of transmitting and receiving a call, a channel scanning means for detecting a channel having the highest reception electric field, and a base station for transmitting a call request signal. Call request signal transmitting means for transmitting to, and response confirmation means for detecting whether a response signal from the base station to the transmission of the call request signal could be received within a predetermined time, The channel scanning means detects a channel having the highest received electric field, the call request signal is transmitted by the call request signal transmitting means via the detected channel, and a base station for transmitting the call request signal is transmitted. The channel scanning means and the call request signal transmission so that a transmission retry operation of causing the response confirmation means to detect the reception of a response signal from And a first control means for controlling the response confirmation means, and the first control means so that the transmission retry operation is repeatedly executed, and the transmission retry operation is predetermined. When the reception of the response signal is detected before the retry is repeated up to the number of retries, the operation shifts to the call transmission operation using the channel used at that time, and the response signal is received even if the transmission retry operation is repeated up to the number of retries. A two-way pager characterized by comprising: second control means for controlling the processing to end as a call failure when the call cannot be made.

[0008]

Embodiments of the present invention will be described below. The hardware configuration of the two-way pager of the present invention may be the same as that of FIG. 2, but the call request processing program executed by the MPU 1 is different. FIG. 1 is a flowchart showing an example of the program. As in FIG. 2 of the conventional method, first, a predetermined channel area is scanned to find a channel having the highest received electric field, and the transmission frequency is locked to the channel. (Step 101), and then a first call request signal is transmitted (step 10).
2). It is monitored for a predetermined time whether a response signal is returned from the base station in response to this transmission (step 103). If no response signal is confirmed, it is checked whether the retry is the fourth or less retry (step 104). Returns to step 102 again to scan the channel region, find the channel with the highest received electric field, and lock the transmission frequency to that channel. In this way, a scan is performed again, and a retry operation of transmitting a call request signal to the determined channel is started. If a response signal can be received by the fourth time by such a retry method, transmission of a call,
That is, the process shifts to dial signal or message transmission processing. If a response signal cannot be received by the fourth time, the processing ends as a call failure.

According to the processing method shown in FIG. 1, a channel scan is performed every time a call request signal is transmitted to check the electric field level. Therefore, a channel that happens to have a high electric field due to noise or the like is selected. However, when the electric field in the steady state of the channel is low, selection is not performed continuously during four retries, so that the probability of call failure can be greatly reduced as compared with the related art. Although the number of retries is four in the example of FIG. 1, it goes without saying that this may be another number.

[0010]

According to the present invention, there is an effect that even when fading occurs, it is possible to more reliably select a channel capable of communicating with the base station and to perform communication via that channel.

[Brief description of the drawings]

FIG. 1 is a process flowchart showing an example of a transmission retry method according to the present invention.

FIG. 2 is a block diagram illustrating a heart configuration example of a bidirectional pager.

FIG. 3 is a processing flowchart showing a conventional transmission retry method.

[Explanation of symbols]

 1 MPU 2 RAM 7 RF section 8 Decoder section

Claims (2)

[Claims] 1. A transmission retry method for establishing a channel with a base station at the time of a call in a two-way pager having both functions of transmitting and receiving a call. A transmission retry operation of detecting a high channel, transmitting a call request signal through the channel, and confirming the reception of a response signal from the base station for the transmission, repeats the response until a predetermined number of retries is repeated. When a signal can be received, the process shifts to a call transmission operation using the channel used at that time, and when the response signal is not received even if the transmission retry operation is repeated up to the number of retries, the processing is determined as a call failure. A method for retrying transmission of a bidirectional pager, the method comprising ending. 2. A bidirectional pager having both functions of transmitting and receiving a call, a channel scanning means for detecting a channel having the highest received electric field, and transmitting a call request signal to a base station. Call request signal transmitting means for receiving, a response confirming means for detecting whether a response signal from the base station to the transmission of the call request signal has been received within a predetermined time, and the channel scan Means for detecting a channel having the highest received electric field, transmitting the call request signal through the detected channel by the call request signal transmitting means, and responding to the transmission of the call request signal from the base station. The channel scanning means, the call request signal transmitting means, and a transmission retry operation of causing a signal reception to be detected by the response confirming means. First control means for controlling the response confirmation means, and controlling the first control means so that the transmission retry operation is repeatedly executed, and wherein the transmission retry operation is performed up to a predetermined number of retries. When the reception of the response signal is detected before repetition, the operation shifts to the call transmission operation using the channel used at that time, and the response signal is not received even if the transmission retry operation is repeated up to the number of retries. And a second control means for controlling the processing to end when the call has failed.