JPH08191472A - Mobile communication wireless terminal calling method - Google Patents

Abstract

(57) [Summary] [Purpose] To reduce the chance of being busy and to effectively use the communication channel. [Structure] When a call is made from the mobile terminal 13, a link channel allocation request is issued to the radio base station 11 ₁ in the zone in which the mobile terminal 13 is located, and the base station 11 ₁ has an empty communication channel or a line 15 ₁ If there is no vacant channel, the terminal 13 is notified of the allocation refusal. The terminal 13 next searches for a control channel with a high reception intensity and which can be communicated. When the control channel from the base station 11 ₂ is received in response to this, a channel allocation request is made to the base station 11 ₂ . , The base station 11 ₂ issues a channel assignment signal when the communication channel and the line 15 ₂ with the exchange 14 are free, and the calling procedure is performed.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention divides a service area such as a car phone and a personal handy phone into a plurality of zones, and connects a wireless terminal and a wireless terminal or a fixed terminal through a wireless base station provided for each zone. The present invention relates to a method for making a call from a wireless terminal in mobile communication for communication.

[0002]

2. Description of the Related Art In a mobile communication network, the position of a wireless terminal is registered in a home memory by knowing which wireless base station the moving wireless terminal is in the service zone of and corresponding to the corresponding wireless base station. . When the wireless terminal communicates, it uses the communication channel of the wireless base station in the current zone, that is, the zone in which the location is registered.

[0003]

As shown in FIG. 2, the wireless
Base station 11₁, 11₂, 11₃Each service zone 12
₁, 12₂, 12₃There is usually a radio base so that some overlap
Stations are often set up. Location-registered wireless base station
If all communication channels are unavailable due to
Call from the wireless terminal is not accepted, the wireless terminal
Communication channels of other nearby radio base stations are available
The communication channel of another wireless base station
Even if it is used, the free communication channel is used in the past.
I can not do it, communication delay for the wireless terminal,
In addition, there is a problem that the use efficiency of radio waves as a whole is poor.
It was.

[0004]

According to the present invention, when a call is made from a wireless terminal, if all the communication channels of the wireless base station with which the wireless terminal is registered are unavailable, the wireless terminal will Another radio base station with which communication is possible is selected and a call is made through the other radio base station.

[0005]

In many cases, wireless terminals receive radio waves from a plurality of wireless base stations. Usually, the location is registered in the wireless base station A with the highest received power, and when a call is made, a call request is made using the control channel of the wireless base station A, and the communication channel assigned to the wireless base station A is set. Use to communicate. However, if all the communication channels of the wireless base station A are unusable, the wireless terminal sends a call request to the wireless base station B with the next strongest reception power with which communication is possible. Although the location registration is not performed for the wireless base station B, the location registration information is not necessary for the processing by the exchange when the call is made. It is possible to connect to the other terminal through the communication channel without any trouble.

[0006]

DETAILED DESCRIPTION FIG. A shows a partial configuration of a mobile communication system to which the present invention is applied. Although the movable wireless terminal 13 is registered in the wireless base station 11 ₁ , the radio wave of the wireless base station 11 ₂ can be received with the power required for communication. These wireless base stations 11 ₁ and 11 ₂ are connected to the exchange 14 and the lines 15 ₁ and 1 2.
5 ₂ are connected to each other.

FIG. 1B shows a wireless terminal 13 according to the present invention.
2 shows an example of a signal sequence with a wireless base station in the method of calling from the. When making a call from the wireless terminal 13, first, a link channel (communication channel) allocation request is sent to the wireless base station 11 ₁ that has registered its location. The wireless base station 11 ₁ checks whether there is a free communication channel and a free channel 15 ₁ with the exchange 14. If there is no free channel, a link channel allocation refusal is returned to the wireless terminal 13. The wireless terminal 13 selects the wireless base station 11 ₂ that is receiving a radio wave having a communicable intensity and sends a link channel allocation request to the wireless base station 11 ₂ . Wireless base station 11
_{At 2} , the wireless base station 11 ₁ checks whether there is a free communication channel and a free channel 15 ₂ with the exchange 14, and if there is a free space, it returns a link channel assignment signal to the wireless terminal 13. Later, the signal transmission and reception, such as call signals to and from the radio terminal 13 and the radio base station 11 ₂ is performed (not shown) establishes communication line, thereby enabling communications.

[0008]

When a wireless terminal makes a call, if all the communication channels of the wireless base station whose location is registered are unavailable, the wireless terminal makes a call using another wireless base station with which the wireless terminal can communicate. As a result, the number of cases in which the wireless terminal cannot make a call is reduced, and the call channel is effectively used.

[Brief description of drawings]

FIG. 1A is a block diagram showing a part of a configuration of a mobile communication system to which an embodiment of the present invention is applied, and B is a signal sequence with a radio base station when a call is made from a radio terminal based on the method of the present invention. It is a figure which shows the Example of.

FIG. 2 is a diagram showing the installation of wireless base stations and their service zones.

Claims (1)

[Claims] 1. A method for calling a wireless terminal of a mobile communication network including a plurality of wireless base stations, wherein when all the communication channels of the wireless base station in which the wireless terminal is registered are unusable, the wireless terminal is A method for calling a wireless terminal for mobile communication, comprising selecting another wireless base station with which communication is possible and making a call using the selected wireless base station.