JP2751449B2 - Method for switching channels during a call on a mobile phone - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for switching channels during a call in a mobile phone, and more particularly to a method for switching channels during a call in a mobile phone that is optimal for a battery-saving type mobile phone.

[Prior Art] Conventionally, in order to extend the use time of a battery, a method of operating a transmitter of a mobile phone only when voice is being input has been adopted.

Further, in order to confirm whether or not the mobile phone is in its own wireless zone, a transmission start request is periodically sent from the wireless zone base station to the mobile phone. That is, a transmission start request is issued to the mobile phone, the output signal transmitted by the mobile phone is received by the wireless zone base station, and the reception level is measured. Was.

[Problems to be Solved by the Invention] According to the above-described conventional method, the transmitter does not operate if there is no voice input to the mobile phone, and if there is no voice input to the mobile phone, the reception level measurement is performed on the wireless zone base station side. Can not. Therefore, in spite of the fact that the reception level of the mobile phone is lowered, the channel cannot be switched during the call until the transmission is requested by the transmission start request from the wireless zone base station, and the channel during the call is cut off. There is a problem.

[Means for Solving the Problems] The present invention has been made in view of the above-mentioned problems, and has been made to be able to switch channels during a call even when there is no voice input while saving battery power. The purpose is to prevent disconnection of the channel during a call,
In order to achieve this object, the reception level of the mobile phone is constantly monitored, and when the reception level falls below a predetermined value, a channel switching request during a call is transmitted to the wireless zone base station, and then the transmitter is temporarily operated. Means, means for transmitting the reception level degradation information to the mobile telephone exchange by the radio zone base station which has received the request for channel switching during communication, and the mobile telephone exchange having received the reception level deterioration information has received the request for channel switching during communication. Means for instructing the wireless zone base station and other adjacent wireless zone base stations to measure the signal level of the mobile phone; and Means for the zone base station and the adjacent wireless zone base station to measure the transmission level of the mobile telephone and report to the mobile telephone exchange; It is configured to provide a means for commanding the mobile phone to switch to the voice channel of the maximum level of the radio zone the base station with respect to the machine.

[Example] Hereinafter, an example of the present invention will be described with reference to the drawings.

FIG. 1 is a timing chart showing one embodiment of a method of switching channels during a call in a mobile phone according to the present invention. FIG. 1 assumes a case in which a subscriber of a mobile phone shifts from a wireless zone during a call to another wireless zone.

In FIG. 1, when a subscriber goes to the periphery of a wireless zone in which a call is in progress, the receiver of the portable telephone 1 detects that the reception level of the voice channel has decreased, and the wireless zone base station 2
In this case, it reports that the reception level of the mobile phone 1 has deteriorated (channel switching request).

Wireless zone base station 2 receiving report of reception level deterioration
Sends information on the reception level deterioration to the mobile telephone exchange 3. The mobile telephone exchange 3 that has received the information issues a command to the wireless zone base station 2 that has received the report of the deterioration of the reception level and the nearby wireless zone base stations to measure the signal level of the mobile phone 1. .

The mobile phone 1 temporarily operates the transmitter, during which the wireless zone base station 2 and the nearby wireless zone base station that are talking on the phone measure the transmission level of the mobile phone 1 and report it to the mobile telephone exchange 3. I do.

The mobile telephone exchange 3 instructs the mobile telephone 1 to switch to the voice channel of the wireless zone base station at the maximum level. The mobile phone 1 switches the channel to the audio channel of the wireless zone base station at the maximum level, and returns to the state in which the transmitter is operated only when audio is input again.

[Effects of the Invention] As described above, the present invention constantly monitors the reception level of a mobile phone and sends a busy channel switching request to a wireless zone base station when the reception level falls below a predetermined value. Means for temporarily operating the transmitter, means for transmitting the reception level deterioration information to the mobile telephone exchange by the radio zone base station which has received the channel switching request during a call, and car telephone exchange receiving the reception level deterioration information, Means for instructing the wireless zone base station receiving the channel switching request during a call and other adjacent wireless zone base stations to measure the signal level of the mobile phone, and the mobile phone temporarily operating the transmitter Means for the communicating wireless zone base station and the adjacent wireless zone base station to measure the transmission level of the mobile phone and report to the mobile telephone exchange during the call;
Means for instructing the mobile telephone to switch to the voice channel of the wireless zone base station at the maximum level with respect to the mobile telephone.
Even while there is no voice input, it is possible to switch the channel during a call while saving battery power, thereby preventing disconnection of the channel during a call.

[Brief description of the drawings]

FIG. 1 is a timing chart showing one embodiment of a method of switching channels during a call in a mobile phone according to the present invention. 1 ... mobile phone 2 ... wireless zone base station 3 ... car telephone exchange

Claims (1)

(57) [Claims] 1. A means for constantly monitoring a reception level of a mobile phone and sending a channel change request during a call to a wireless zone base station when the reception level falls below a predetermined value, and thereafter temporarily operating a transmitter. Means for transmitting the reception level degradation information to the mobile telephone exchange by the radio zone base station which has received the request for switching the busy channel; Means for instructing the zone base station and other adjacent wireless zone base stations to measure the signal level of the mobile phone; and, while the mobile phone temporarily operates the transmitter, Means for the zone base station and the adjacent wireless zone base station to measure the transmission level of the mobile telephone and report to the mobile telephone exchange; Means for instructing the portable telephone to switch to the voice channel of the wireless zone base station at the maximum level for the talker.