JPH09294291A - Connection control method for radio communication network - Google Patents

Abstract

PROBLEM TO BE SOLVED: To relieve the load of the user by detecting the presence of an idle speech channel in call connection to other base stations than a radio base station providing an output of information denoting absence of an idle speech channel and making call connection to a prescribed base station so as to acquire other base station automatically. SOLUTION: An idle speech channel information processing section 1e is part of a control channel control section 1d, acquires idle speech channel information from control channels received from a base station and decides stop of the acquisition of the base station when no idle speech channel is available in the base station and searches other base station or the like. Since a mobile station acquiring or going to acquire a base station acquires a base station with an idle speech channel automatically when no idle speech channel is found out based on idle speech channel information added to a received control channel, the mobile station acquires a base station with an idle speech cannel at a higher rate so as to improve a position registration success rate, a call reception rate and a call success rate.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a connection control method for a mobile wireless communication network such as a mobile phone or PHS.

[0002]

2. Description of the Related Art A plurality of systems are conceivable for mobile units, and a PHS system will be described as an example. FIG. 13 is a diagram showing the relationship between a PHS base station, its area, and a mobile station. In the figure, 13a1 and 13a
2 is a base station, and 13b1 and 13b2 are base stations 13 respectively.
Areas a1, 13a2, 13c1, 13c2, 13c
3, 13c4 is a mobile station, 13d1, 13d2, 13d3
Is the communication channel of the base station 13a1, 13e1 is the base station 1
3a1 is a control channel, and mobile stations 13c1 and 13c
The communication channels 2 and 13c3 are assigned to the base station 13a1, and the mobile station 13c4 is in the area of the base stations 13a1 and 13a2 and receives the control channel of 13a1.

A PHS base station can allocate a communication channel to a maximum of three mobile stations. In FIG.
The base station 13a1 already has three mobile stations 13c1 and 13c.
Since the communication channels are assigned to the mobile stations 13c3 and 13c3, the mobile station 13c4 receives the control channel of the base station 13a1 in the area of the base station 13a1.
Even if the call channel allocation is requested to a1, the call channel allocation is rejected by the base station 13a1. The mobile station 13c4, which has been denied the allocation of the call channel from the base station 13a1, is in the area of the base station 13a2 having an empty call channel,
The control channel of the base station 13a1 is continuously received, and the request for the allocation of the communication channel is repeated after an appropriate time.

Further, in the connection control method disclosed in Japanese Patent Laid-Open No. 5-191856, as a method of knowing the state of the idle call channel of the base station, the congestion information of the call channel is added to the control channel notified by the base station. did. The mobile station receiving the information displays the information on the display to inform the user of the mobile station of the current communication channel status.

[0005]

In the prior art, although the mobile station requested the allocation of the call channel for location registration, incoming call, call origination, etc., all the call channels of the base station are used. If not allocated in the mobile station, the mobile station has to repeat the request for allocation of the communication channel many times because the mobile station does not know the status of the unused communication channel. Therefore, there have been problems such as a decrease in incoming call rate, a decrease in outgoing call success rate, and an increase in current consumption.

Further, in the connection control method disclosed in Japanese Patent Laid-Open No. 5-191856, if the currently acquired base station does not have an empty call channel, the user must search for an area having the empty call channel. There wasn't. An object of the present invention is to solve the above-mentioned drawbacks of the prior art and reduce the burden on the user by automatically acquiring another base station.

[0007]

According to a first aspect of the present invention, there is provided a wireless communication network connection control method, comprising: a first step of inputting information indicating that there is no idle communication channel from the base station;
When the information about the empty call channel is input in the first step, it is detected whether or not there is an empty call channel for outgoing connection to other base stations except the wireless base station that has output the information about the empty call channel. The second step to do,
And a third step of making an outgoing connection with a predetermined base station based on the detection result of the second step. Further, a connection control method for a wireless communication network according to claim 2 of the present invention performs the processing from the first step to the third step when the wireless terminal registers the location. Further, a connection control method for a wireless communication network according to a third aspect of the present invention is to perform the processing from the first step to the third step when the wireless terminal receives a call. Furthermore, the connection control method for a wireless communication network according to claim 4 of the present invention is such that when a wireless terminal makes a call,
The processing from the first step to the third step is performed.

[0008]

BEST MODE FOR CARRYING OUT THE INVENTION

Embodiment 1. Embodiment 1 of the present invention will be described below with reference to the drawings. FIG. 1 is an example of the present invention and is a block diagram showing a configuration of a mobile station. In the figure, 1a is a mobile station, 1b is a radio controller, 1c is a speech channel controller,
Reference numeral 1d is a control channel control unit, and 1e is an idle call channel information processing unit.

In FIG. 1, the idle call channel information processing unit is a part of the control channel processing unit, and obtains the idle call channel information from the control channel received from the base station,
If the base station does not have a free speech channel, it decides to cancel the acquisition of the base station and searches for another base station.

FIG. 2 is a diagram showing the operation of the mobile station when the present invention is used for PHS. In the figure, 2a1, 2a
2 is a base station, 2b1 and 2b2 are base stations 2a1 and 2a1, respectively.
2a2 area, 2c1, 2c2, 2c3 and 2c4 are mobile stations, 2d1, 2d2 and 2d3 are communication channels of the base station 2a1, 2e1 and 2e2 are base stations 2a1 and 2a, respectively.
Mobile station 2c1, 2c2, 2c
3 is assigned a communication channel to the base station 2a1, and the mobile station 2c4 receives the control channel of the base station 2a1. Further, the control channels 2e1 and 2e2 are added with information indicating the presence / absence of a vacant speech channel necessary for implementing the present invention, and the mobile station 2c4 is a mobile station having the configuration shown in FIG.

In FIG. 2, when the mobile station 2c4, which is an example of the present invention, receives a control channel without an idle call channel, it stops receiving the control channel and the control channel of the base station 2a2 with an idle call channel. To start receiving.

FIG. 8 is an example of a control channel broadcast by a PHS base station. In the PHS, the control channel is transmitted in units of slots every 100 ms. In the case of FIG. 8, 12 slots are transmitted, and transmission is performed from the beginning.
The repeating unit is called a super frame.

The control channel mainly used is BC 8a
There are 3 types of CH, 8b PCH, 8c SCCH,
The BCCH is a control channel for reporting information, and reports the structure of superframes, function information of base stations, and the like. PCH
Is an incoming call control channel for informing an incoming call to mobile stations in the area. The SCCH is a control channel for channel setting and is used when establishing a speech channel.

Of the three types of control channels, the PHS mobile station first receives the BCCH to know the structure of the superframe, and receives the PCH. The PCHs are grouped according to the telephone number of their own station, and receive only the PCHs of the group to which their own station belongs.

FIG. 9 shows the internal structure of the BCCH slot. One slot consists of 224 bits, of which the portion 9a represents the information as BCCH.

FIG. 10 shows a portion corresponding to 9a in FIG.
It is a figure showing the information structure of the radio channel information alerting which is a kind of BCCH. In FIG. 10, if, for example, 1 bit of 10a is used as a free call channel information bit and the presence or absence of a free call channel is represented by 1 or 0 of this bit, the mobile station receives this control channel at the time of base station search. Then, the information of the idle call channel of the base station which is broadcasting this control channel can be acquired, and the control operation of the present invention can be performed.

FIG. 11 is a structural diagram of the inside of the PCH slot. The portion 11a represents the information as PCH.

FIG. 12 is a portion corresponding to 11a in FIG. 11, and is a diagram showing the information structure of an incoming call which is a kind of PCH. In FIG. 12, for example, 1 bit of 12a is used as a free speech channel information bit, and 1 or 0 of this bit is used.
When the mobile station receives this control channel at the time of standby, location registration, incoming call, and outgoing call, it indicates the presence or absence of an idle call channel. Information can be obtained and the control operation of the present invention can be performed.

FIG. 3 shows a processing method when the mobile station searches for a base station using the control channel as described above. In FIG. 3, 3a is a process for searching and receiving the BCCH among the control channels broadcast by the base station.
b is a process for determining whether or not the control channel has been received, 3c is a process performed by the idle call channel information processing unit 1e in FIG. 1, and is a process for using the idle call channel information bit provided in BCCH, and 3d in 3c is Processing for acquiring information on idle call channels from the received BCCH, 3e is 3d
Processing for deciding a base station to be captured based on the information acquired in 3f is processing for locating the base station determined in 3e, 3g
Is a process of determining whether a base station has been acquired. 3
In d, if there is no base station with a free call channel, a base station without a free call channel may be selected. As described above, a mobile station that captures or attempts to capture a base station automatically selects a base station with an idle call channel if there is no available call channel in the received call channel information added to the control channel. Since it is difficult to capture, the rate of capturing a base station having an idle call channel is high, and the location registration success rate, the incoming call rate, and the outgoing call success rate can be increased.

Embodiment 2 FIG. 4 shows a processing method when the mobile station performs a standby operation using the control channel as shown in the first embodiment. In FIG. 4, 4a
Is a process of searching for and receiving the PCH among the control channels broadcast by the base station, 4b is a process of determining whether or not the control channel has been received, 4c, 4d and 4e are incoming call, location registration and outgoing call, respectively. This is a process for determining whether or not to do so. When there is no other base station with an idle call channel and the base station with no idle call channel continues to be captured, it is decided to stop each process. Reference numeral 4f represents processing performed by the idle call channel information processing unit 1e in FIG. 1 and using idle call channel information bits provided in the PCH.
Is a process of acquiring information of an idle call channel from the received control channel, 4h is a process of determining a base station to be captured based on the information acquired in 4g, and 4i is a base station search of FIG. 3 when the base station is changed. It is a process that shifts the process to. In the standby process, the incoming call determination process is performed before the idle call channel determination process, so that the presence or absence of an incoming call can be confirmed even when there is no idle call channel. The same applies to location registration and call origination. As described above, useless position registration, incoming call, and outgoing call operation are not performed, so that power consumption can be suppressed. Further, it is possible to reduce the burden on the user, such as searching for a base station area having an idle call channel.

Embodiment 3 FIG. 5 shows a processing method when the mobile station performs a location registration operation using the control channel as shown in the first embodiment. In FIG.
5a is performed by the idle call channel information processing unit 1e of FIG.
5b represents a process of using an empty call channel information bit provided in the PCH, 5b is a process of acquiring information of an empty call channel from the received control channel, and 5c is a base station which captures based on the information acquired in 5b 5d is a process of shifting the process to the base station search of FIG. 3 when the base station is changed. When the process shifts to the base station search, and there is no other base station with a free call channel, and the base station with no free call channel continues to be captured, the location registration process is performed at 4f of the standby process in FIG. Decide to cancel. As described above, since unnecessary position registration operation is not performed, power consumption can be suppressed. Further, it is possible to reduce the burden on the user, such as searching for a base station area having an idle call channel.

Embodiment 4 FIG. 6 shows a processing method when the mobile station makes an incoming call operation by using the control channel as shown in the first embodiment. In FIG. 6, 6a
Is performed by the free call channel information processing unit 1e of FIG.
A process for using the idle call channel information bit provided in H is shown, 6b is a process for obtaining the idle call channel information from the received control channel, and 6c is a base station for capturing based on the information obtained in 6b. Is the process of determining
Reference numeral 6d is a process for shifting the process to the base station search shown in FIG. 3 when the base station is changed. When the process shifts to the base station search, and there is no other base station with an empty call channel, and a base station with no empty call channel continues to be captured, the incoming call process is performed at 4g of the standby process in FIG. Decide to cancel. As described above, useless incoming call operation is not performed, so that power consumption can be suppressed. Further, it is possible to reduce the burden on the user, such as searching for a base station area having an idle call channel.

Embodiment 5 FIG. 7 shows a processing method when the mobile station makes a call using the control channel as shown in the first embodiment. In FIG. 7, 7a
Is performed by the free call channel information processing unit 1e of FIG.
7b is a process of using an empty call channel information bit provided in H, 7b is a process of acquiring the information of the empty call channel from the received control channel, and 7c is a base station that captures based on the information acquired in 7b. Is the process of determining
7d is a process of shifting the process to the base station search of FIG. 3 when the base station is changed. When the process shifts to the base station search, there is no other base station with an empty call channel, and the base station without an empty call channel continues to be captured, the call process is performed in 4e of the standby process in FIG. Decide to cancel. As described above, useless calling operation is not performed, so that power consumption can be suppressed. Further, it is possible to reduce the burden on the user, such as searching for a base station area having an idle call channel.

[0024]

As described above, according to the present invention, when the information indicating that there is no empty call channel is input, the originating connection is made to the other base stations except the radio base station which outputs the above information indicating that there is no empty call channel. It detects the presence or absence of a free call channel and establishes an outgoing connection with a predetermined base station based on the detection result, so it can automatically capture other base stations and reduce the burden on the user. it can.

[Brief description of drawings]

FIG. 1 is a block diagram showing a configuration example of a mobile station as an embodiment of the present invention.

FIG. 2 is a diagram showing an operation of a mobile station when the present invention is implemented in PHS.

FIG. 3 is a flowchart showing a base station search processing method according to an embodiment of the present invention.

FIG. 4 is a flowchart showing a location registration processing method according to an embodiment of the present invention.

FIG. 5 is a flowchart showing a standby processing method as an embodiment of the present invention.

FIG. 6 is a flowchart showing an incoming call processing method according to an embodiment of the present invention.

FIG. 7 is a flowchart showing a call processing method as an embodiment of the present invention.

FIG. 8 is an example of a control channel configuration (superframe) broadcast by a PHS base station.

FIG. 9 is a diagram showing a configuration in a BCCH slot among control channels broadcast by a PHS base station.

FIG. 10 is a diagram illustrating an example of adding idle call channel information to a wireless information notification message, which is a type of BCCH.

FIG. 11 is a diagram showing a configuration in a PCH slot among control channels broadcast by a PHS base station.

FIG. 12 is a diagram showing an example of adding idle call channel information to an incoming call message, which is a type of PCH.

FIG. 13 is a diagram illustrating an operation of a PHS mobile station as a conventional example.

[Explanation of symbols]

1a Mobile station, 1b Wireless control unit, 1e Free call channel information processing unit, 2a1, 2a2 Base station, 2c1, 2c
c2, 2c3, 2c4 Mobile station, 3b Control channel presence / absence determination processing, 3c Free call channel information processing, 3d
Free call channel information acquisition processing, 3e base station selection processing, 3f base station acquisition processing, 3g base station acquisition completion determination processing.

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Junichi Sakamoto 2-3-2 Marunouchi, Chiyoda-ku, Tokyo Sanryo Electric Co., Ltd.

Claims (4)

[Claims] 1. In a connection control method for a wireless communication network including a wireless base station that receives an outgoing connection request from a wireless terminal, the wireless terminal includes a first step of inputting information indicating that there is no available communication channel from the base station. , If the information of the above-mentioned empty call channel is input in the first step, the presence / absence of an idle call channel for outgoing connection to other base stations other than the wireless base station that has output the information of the above-mentioned empty call channel is checked. A connection control method for a wireless communication network, comprising: a second step of detecting; and a third step of making an outgoing connection with a predetermined base station based on the detection result of the second step. . 2. The connection control method for a wireless communication network according to claim 1, wherein when the position of the wireless terminal is registered, the processes of the first to third steps are performed. 3. The connection control method for a wireless communication network according to claim 1, wherein when the wireless terminal receives an incoming call, the processes of the first step to the third step are performed. 4. The connection control method for a wireless communication network according to claim 1, wherein when the wireless terminal makes a call, the processes of the first to third steps are performed.