JP3204186B2 - Base station selection method - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a base station selection system in a mobile radio communication system such as a cellular phone and a PHS.

[0002]

2. Description of the Related Art With the recent innovation of communication technology, wireless communication systems exhibiting various system forms are widely used for the purpose of realizing ultimate "personal communication" which does not limit use place and time. Have been. Furthermore, among a plurality of services provided by the plurality of wireless communication systems, a plurality of services can be selected, and these can be used by one terminal simultaneously or selectively and used by a composite terminal. Practical application development is under consideration.

[0003] The services of a plurality of wireless communication systems used by the above-mentioned composite terminal are more localized than those provided by a wireless communication system which constitutes a wide service area and are provided at a high usage fee. In general, a narrow service area is configured and selected in combination with a service provided by a wireless communication system provided at a low usage fee.

[0004] Hereinafter, a service selection operation of the above-described composite terminal will be described with reference to the drawings.

FIG. 12 is a schematic diagram of an operating environment of a terminal shown as a conventional example. 1 is a public telephone line network, 2 is a backbone network (wide area service network) of a wireless communication system which constitutes a wide service area and is provided at a high usage fee, 21,
Reference numerals 22 and 23 denote a plurality of wireless base stations connected to the wide area service network 2, and 3 denotes a wireless area provided at a low usage fee by forming a local and narrow service area as compared with the service area of the wide area service network 2. Backbone network of communication system (narrow area service network), 3
Reference numeral 1 denotes a wireless base station connected to the narrow-area service network 3, and 200 denotes a composite terminal (terminal) that can use both the service provided by the wide-area service network 2 and the service provided by the narrow-area service network 3. is there.

[0006] Reference numerals 121, 122, and 123 denote wireless zones formed by the wireless base stations 21, 22, 23, respectively.
The radio base stations 21, 22, and 23 transmit, as a control signal, information on the radio communication system to which the radio base station belongs, information on the wide area service network 2 to which the radio base station is connected, and information on each of the radio base stations 21, 22, and 23 as control signals. Notification is made within 121, 122 and 123. The wireless zones 121, 122, and 123 constitute a service area 120 of the wide area service network 2 as a whole.

[0007] Reference numeral 131 denotes a wireless zone formed by the wireless base station 31. The wireless base station 31 reports information on the wireless communication system to which the wireless base station 31 belongs, information on the short-range service network 3 to which the wireless base station 31 is connected, and information on the wireless base station 31 in the wireless zone 131 as a control signal. The wireless zone 131 constitutes the service area 130 of the narrow area service network 3.

[0008] The radio base stations 21, 22 and 23 connected to the wide area service network 2 and the radio base station 31 connected to the narrow area service network have different control signal notification systems.

In some cases, these control signals include an identification code that can be uniquely identified by the radio base station that has broadcasted the control signal. In this case, the terminal uses the received control signal based on the identification code. It is possible to determine the wireless base station that is the source of the signal.

FIG. 13 is a diagram showing the basic configuration of a composite terminal in a wireless communication system.

Reference numeral 150 denotes an antenna, 151 denotes a wireless carrier receiving unit, 152 denotes a wireless carrier transmitting unit, 153 denotes a storage unit, 154 denotes a terminal central control unit, and 155 denotes an external I / F.

The wireless carrier transmitting section 152
A plurality of wireless carrier transmitting means are provided for transmitting signals to and communicating with wireless base stations belonging to a plurality of wireless systems by a wireless communication system.

[0013] Further, the radio carrier receiving section 151 receives, from the radio base stations belonging to a plurality of radio communication systems used by the terminal 200, control signals broadcast in different systems for each radio communication system. A plurality of wireless carrier receiving means are provided.

The terminal central control unit 154 instructs the wireless carrier receiving unit 151 and the wireless carrier transmitting unit 152 to selectively switch the wireless carriers to be communicated, such as starting and stopping.

The wireless carrier receiving section 151 reads out the identification code of the wireless base station from the received control signal from the wireless base station, and notifies the terminal central control section 154 of this. The terminal central control unit, based on this notification,
It is possible to recognize a wireless base station near 0 and with which communication is possible.

[0016] terminal, for any wireless communication system, receives a control signal for notifying the base station, an operation to confirm whether to present communicable base station around the terminal, the following This is a base station capturing operation. In addition, the terminal performs an operation of continuously communicating a control signal with any one of the wireless base stations belonging to the wireless communication system in order to enjoy a service provided by the wireless communication system. And

The terminal 200 is connected to the service area 120
Inside, the wireless base station 21 performs a standby operation with any one of the wireless base stations 21, 22, and 23 constituting the wireless zone for the wide area service network 2, and enjoys the service provided by the wide area service network 2.

The terminal 200 is connected to the service area 130
Inside, it performs a standby operation with the wireless base station 31 and enjoys the service provided by the narrow area service network 3.

A wide area service network 2 and a narrow area service network 3 are connected to the public telephone network 1. The above-mentioned wide area service network 2 and narrow area service network 3 are terminals 200 wirelessly connected to any one of the radio base stations 21, 22, 23 and the radio base station 31.
Connection to the public telephone network 1 at the request of
Providing services.

The terminal 200 can be moved to any position. When the terminal 200 is in the service area 130, the usage fee can be reduced by selecting and using the service of the narrow area service network 3. Further, when the terminal 200 is outside the service area 130 and inside the service area 120, by selecting a service of the wide area service network 2, it is possible to secure a wide spatial area that the terminal 200 can use. Can be.

However, when the service area 130 is included in the service area 120, the terminal 200 continues to use the service provided by the wide area service network 2 provided in the service area 120, and provides a low-cost narrow service provided by the service area 120. The switching to the service of the area service network 3 is not performed, and the usage fee increases.

In order to solve the above problem, when the terminal is located near the service area 130 of the narrow area service network and is in a state capable of receiving a control signal broadcast from the radio base station 31, the radio base station 31 On the other hand, it is necessary to perform a base station capturing operation and switch to the service of the narrow area service network 3 which is provided at a low cost.

As the switching means, for example, in the conventional base station selection method disclosed in Japanese Patent Laid-Open No. 6-104827, the base station identification code of the wireless base station 31 and the wide area service network 2 closest to the wireless base station 31 The base station identification codes of the radio base stations 21, 22, and 23 are stored in the storage unit 153 of the terminal 200 in advance, and when these identification codes are detected by the radio carrier reception unit 151 of the terminal 200, the radio A method of initiating a base station acquisition operation for the base station 31 has been devised.

FIG. 14 is an example of a processing flow for setting the start of the base station capturing operation for the narrow area service network in the base station selection method of the terminal 200 according to the conventional means.

Steps S21 to S31 are processing blocks executed in the processing flow of base station selection according to the conventional method.

The terminal 200 first performs a base station capturing operation only on the wide area service network 2 and starts a standby operation on an optimal wireless base station. When the terminal 200 switches the standby wireless base station in S22 across the wireless zone configured by the wireless base station within the service area 120, the wireless carrier receiving unit 151 determines in S23 the wireless base station of the standby wireless base station. The identification code of the wireless base station is read from the control signal to be broadcast, and the terminal central control unit 154 is read.
Notify.

[0027] In the storage unit 153 of the terminal 200, the identification code of the nearest wireless base station in the service area 130 of the narrow area service network 3 where the base station acquisition operation should be started automatically is stored as a reference identification code. ing.

The terminal central control unit 154, having received the notification of the switching of the standby radio base station, compares the identification code of the standby radio base station with the reference identification code in S24.

When terminal 200 approaches service area 130 and starts a standby operation for any of radio base stations 21, 22, and 23, radio carrier receiving section 151
The identification code of the waiting radio base station notified from the above and the reference identification code match. If they match, it is determined that the terminal is approaching the service area 130 and S2
At 6, the base station acquisition operation for the narrow area service network 3 is started. Further, when the identification code of the wireless base station 31 capable of the standby operation is detected, the standby operation for the narrow area service network 3 is started.

The terminal central control section 154 determines whether or not to switch to the inexpensive service of the narrow area service network 3 when the standby operation for the narrow area service network 3 is started.

[0031]

In the base station selection method shown in the conventional example, the receiving operation for the own base station is started from the detection of the radio base station identification code of the wide area service network stored in the terminal 200 in advance.

However, the information on the wide area service network managed by the terminal 200 is only the identification code of the wireless base station belonging to the wide area service network. It is just inside the zone.

Therefore, the area of the wireless zone formed by one wireless base station belonging to the narrow area service network is much smaller than the area of the wireless zone formed by one wireless base station belonging to the wide area service network. In this case, the information about the environment around the terminal is too rough to determine whether the terminal 200 is near the service area 130 of the narrow area service network.
However, there is a problem that the base station capture operation is performed on the narrow area service network while clearly outside the service area of the narrow area service network, and the power consumption of the terminal increases.

[0034] In view of the above problems, the present invention automatically performs a selective start / stop setting operation of a monitoring operation of whether or not a plurality of available wireless communication systems can be connected to a wireless base station. It is an object of the present invention to realize a base station selection method that suppresses power consumption of a terminal and improves the usability of a terminal.

[0035]

According to a first aspect of the present invention, there is provided a base station selection system for receiving a base station identification code included in a control signal broadcast from a radio base station, and a reception level of the control signal. Reception level monitoring means for detecting the range of the reception signal, reception state storage means for storing the detected base station identification code and the range of the reception level as information relating to the reception state regarding the control signal, and the terminal automatically providing the second service A reference state in which an identification code and a control signal reception level range of a radio base station to be referenced belonging to the first service network in a region where the base station acquisition operation is started for the network are stored as information on the reference reception state. The storage unit compares the information on the reception state of the control signal with the information on the reference reception state, and based on the comparison result, End is to understand the surrounding environment based on the information regarding the reception status of the control signal, when the terminal has entered the predetermined region, it is to start the base station catching operation for the second service network.

In the base station selection method according to a second aspect of the present invention, the reception state storage means stores information on a reception state of a control signal broadcast from a plurality of radio base stations which can be received by the terminal, and stores the reference state. The storage means stores in advance information about a reference reception state of a control signal of a plurality of radio base stations to be referred to, from information about a reception state of a plurality of control signals,
The environment surrounding the terminal is grasped in more detail, and when the terminal enters a predetermined area, a base station capturing operation for the second service network is started.

In the base station selection method according to a third aspect of the present invention, the reference state storage means stores information on an arbitrary setting operation to be performed by the terminal when the terminal is in an area defined by the reference reception state, When the terminal enters the area defined by the information on the reference reception state, the setting operation is started based on the stored information on the arbitrary setting operation to be performed by the terminal.

In the base station selection method according to a fourth aspect of the present invention, the reference state storage means stores a plurality of pieces of information relating to a reference reception state and an arbitrary setting operation relating to base station selection, and the terminal transmits a plurality of pieces of reference reception state When entering any of the multiple areas defined based on
This setting operation is started by referring to information of an arbitrary setting operation for the corresponding reference reception state.

In the base station selection method according to a fifth aspect of the present invention, the reference state storage means includes a reference base station state and information defining a switching operation of a reference target in a plurality of stored reference reception state tables. A reference reception status table relating to reference target switching is stored, and when the terminal enters the area defined by the reference reception status table relating to the above reference target switching, a plurality of other reference reception status tables are automatically referred to. This switches the designation of the target.

[0040]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiment 1 Hereinafter, a first embodiment of the present invention will be described with reference to the drawings. Embodiment 1
In the following, a description will be given of a terminal of a mobile communication system such as a PHS that functions as a self-employed system in an office and as a simple mobile phone outdoors. Here, a private PHS system used in a business establishment is regarded as a narrow-area service network, and a PHS public system used outdoors is regarded as a wide-area service network system.

FIG. 1 is a schematic diagram of the operating environment of the terminal according to the first embodiment. 1 is a public telephone network. 2 is a PH that constitutes a large service area and is offered at a high usage fee
S's public system, 21, 22, and 23 each have PH
S are a plurality of radio base stations connected to the public system (hereinafter abbreviated as public CS (Cell Station)). Reference numeral 3 denotes a PHS private system which constitutes a local and narrow service area as compared to the PHS public system and is provided at a low usage fee, and 31 denotes a radio base station (hereinafter referred to as a private CS) connected to the PHS private system. (Cell
Station). 100 is PH
It is a terminal that can use both services provided by the S public system 2 and the PHS private system 3.

Reference numerals 121, 122 and 123 represent public CS2
Reference numerals 1, 22, and 23 are wireless zones for the PHS public which are respectively constituted. 120 is a wireless zone 121, 122,
This is a service area of the PHS public system 2 which is composed of the entire 123.

Reference numeral 131 denotes a PHS constituted by the CS 31
It is a wireless zone for private use. 130 is the wireless zone 13
1 is a service area of the PHS private system 3.

FIG. 2 shows an identification code of a radio base station that is notified by a radio base station specified in “RCR STD-28 (ARIB). Public CS
21, 22 and 23 and the private CS 31 are provided with identification codes (public CS-ID and private CS-ID) unique to the public CS and the private CS, respectively. CS-ID and self-operated CS-I
The control signal including D is broadcast. A public CS 21, 22, 23 connected to the PHS public system 2;
The frequency and timing at which the control signal is notified are different from those of the private CS 31 connected to the private system 3.

An operation in which a terminal receives a control signal broadcast from a base station for an arbitrary wireless communication system and checks whether a communicable base station is present around the terminal is described below. This is a capturing operation. In addition, the terminal performs an operation of continuously communicating a control signal with any one of the wireless base stations belonging to the wireless communication system in order to enjoy a service provided by the wireless communication system. And

FIG. 3 is a basic configuration diagram of a PHS terminal (terminal 100) of the wireless communication system according to the first embodiment. 14
0 is an antenna, 141 is a wireless carrier receiving section, 142 is a wireless carrier transmitting section, 143 is a storage section, 144 is a terminal central control section, 145 is an external I / F, 146 is a received carrier monitoring section, and 147 is a reception state storage section. Reference numeral 148 is a reference state storage unit.

The wireless carrier receiving section 141 has a plurality of independent wireless carrier reception processing means in each system in order to communicate with both the PHS public system 2 and the PHS private system 3. Similarly, the wireless carrier transmission unit 142 includes a plurality of wireless carrier transmission processing units. In a general PHS terminal, communication with both the PHS public system 2 and the PHS private system 3 is performed in a time-division manner, and the circuit size of the wireless carrier receiving unit 141 and the wireless carrier transmitting unit 142 is often reduced. .

The terminal central control unit 144 selectively switches a plurality of wireless carrier processing means provided in the wireless carrier receiving unit 141 and the wireless carrier transmitting unit 142, and
It is possible to start and stop the receiving operation of the control signals notified by S21, S22, S23 and the self-service CS31. That is, both the PHS public carrier and the PHS private carrier are received and the radio base station capturing operation is performed for the radio base stations of both systems. It is also possible to perform a radio base station capturing operation. However, if the radio base station capturing operation is performed for both systems, the power consumption of the terminal 100 increases and the usage time decreases.

Even when the terminal 100 is performing a standby operation with respect to any of the radio base stations belonging to the PHS public system 2 or the PHS private system 3, the base station with respect to the PHS public system 2 is provided at regular intervals. It is possible to perform a station acquisition operation and receive a control signal transmitted from a CS existing near the terminal 100.

When the radio carrier receiving section 141 receives a control signal broadcast from the radio base station in the base station capturing operation, the radio carrier receiving section 141 receives the control signal from the public base station identification code, which is a base station identification code.
It reads out the ID or the self-owned CS-ID and notifies the terminal central control unit 144 of this.

The wireless carrier reception level monitoring unit 146
The reception level of the wireless carrier received by the wireless carrier receiving unit 141 at the terminal 100 is monitored, and the level is classified into a range of the reception level such as a low level, a medium level, and a high level. Control unit 144
Notify.

The terminal central control unit 144 converts the control signal received by the radio carrier receiving unit into a public CS-I
D or the own CS-ID and the range of the reception level are combined, and this is stored in the reception state storage unit 147 in the storage unit 143 as information regarding the reception state of one radio base station that has received the control signal.

Information stored in reception state storage section 147 is updated every time radio carrier receiving section 141 receives a control signal.

In the terminal 100, the PHS in the area where the base station acquisition operation should be started for the PHS
The public CS-ID of the control signal of the S public system 2 and the range of the reception level are stored in the reference reception state storage unit 148 as the reference reception state.

Each time the information on the reception state of the control signal stored in the reception state storage section 147 is updated, the terminal central control section 144 compares the information with the reference reception state, and can determine that they match or coincide with each other. In this case, the base station capturing operation for the PHS private system 3 is started.

FIG. 4 is an operation environment schematic diagram schematically illustrating an environment (reception state) to which the first embodiment is applied.
Inside the wireless zone 121 configured by the public CS 21, there is a wireless zone 131 configured by the private CS 31. P
The service area 130 of the HS private system corresponds to the wireless zone 131. The shaded area in the figure is a region where the control signal broadcast from the public CS 21 is received by the terminal 100 in a range of a medium reception level.

In the first embodiment, the environment of the terminal 100 in the wireless zone 121 is grasped by using the range of the control signal reception level in accordance with the public CS-ID included in the control signal.

For example, in the terminal 100, the public CS-ID of the public CS 21
Also, when the wireless carrier reception level monitoring unit 146 detects a medium reception level range, it can be understood that the terminal 100 is in the hatched area in the wireless zone 121.

In the terminal 100, the reference state storage unit 14
8 shows a public CS-ID of a control signal of the PHS public system 2 around the wireless zone 131 of the PHS private system 3 as an area where the base station capturing operation for the PHS private system 3 should be started automatically. And the range of the reception level are stored in advance as the reference reception state.

The terminal central control section 144 compares the reception state stored in the reception state storage section 147 with the above-mentioned reference reception state, and if they match or can be regarded as coincident, the PHS private system 3 Start the base station acquisition operation.

As described above, for the control signal received during the base station capturing operation according to the first embodiment, the base station identification code and the range of the reception level are stored together.
The environment in which the terminal is located can be grasped in more detail than the conventional method in which the PHS public wireless zone is grasped in units of radio zones. Based on this, the start of the base station acquisition operation for the PHS private system 3 can be started. It can be finely controlled.

Embodiment 2 Hereinafter, in the first embodiment,
The public C of the control signal of the public CS station received by the terminal 100
The environment in which the terminal 100 is located is roughly grasped from the S-ID and the range of the reception level, and the base station capturing operation for the PHS private system 3 is started based on the rough environment. For the control signals of a plurality of public CSs received, the public CS-IDs and the ranges of their reception levels are stored as reception states, and based on this, the environment where the terminal 100 is located is grasped in more detail, Based on this, the base station capturing operation for the PHS private system 3 is started. Therefore, the configuration operations of FIGS. 1 to 4 described in the first embodiment are basically the same. Hereinafter, a characteristic operation configuration of the second embodiment will be described with reference to FIGS. 1 to 4 described above.

[0063]

[Table 1]

FIG. 7 shows an example of a PHS public system reception status table. Reference numeral 102 denotes a PHS public system reception status table. The PHS public system reception status table 102 (Table 1) includes, for example, the public CS- of control signals, which are received from a plurality of base stations and received from a base station capturing operation performed on the PHS public system 2. The ID and the range of the reception level of the control signal at the terminal 100 are included.

The PHS public system reception status table 102 (Table 1) is stored in the reception status storage section 147 of FIG.

The PHS public system reception status table 102 (Table 1) is updated every time the radio carrier reception unit 141 performs a base station capturing operation, and the reception status storage unit 147 is updated.
Is held.

On the other hand, in the reference state storage section 148 in the storage section 143 of FIG. 3, a reference reception state table including information to be referred to by the terminal central control section 144 when performing an operation setting relating to base station selection is stored in advance. Have been.

[0068]

[Table 2]

Is an example of the reference reception status table. Reference numeral 104 denotes a reference reception state table.

Reference numeral 105 denotes information describing a reference reception state of a control signal of a plurality of radio base stations of the PHS public / private system to be referred to. In the second embodiment, the information 105 on the reference base station status includes, for example, the public CS-IDs of a plurality of reference wireless base stations and the range of the control signal reception level for each reference wireless base station. In this way, the reception states of a plurality of radio base stations to be referred to are stored, and this is compared with the reception state of the reception state storage unit 147 to determine the base station. It is possible to define settings for the selection operation.

Reference numeral 106 denotes the terminal 100 in the reference reception state.
This is information that describes the setting of an operation related to base station selection to be performed by the terminal 100 in the case where there is any. In the second embodiment, reception state table 102 (Table 1) and reference reception state table 104
(Table 2) Setting operation 106 relating to base station selection to be performed by terminal 100 in a state in which it matches or can be regarded as matching
For example, the start of the base station capturing operation to the PHS private system 3 is described.

In one reference reception state table 104 (Table 1), information 105 on the reference reception state and its setting operation 106 are described together.

FIG. 5 is a schematic diagram showing an operating environment to which the second embodiment is applied. 21 and 22 are public CSs and 121 and 122 are public CSs 21 and 22, respectively.
Is a wireless zone configured. 31 is self-owned CS, 1
Reference numeral 31 denotes a wireless zone configured by the self-service CS31. The shaded area in the figure is an area where the control signal broadcast from the public CS21 and the control signal broadcast from the public CS22 are both received at the terminal 100 in a low reception level range.

In the second embodiment, a reception state table is created based on a control signal reported by a plurality of wireless base stations, which is received when the wireless carrier receiving section 141 performs a base station capturing operation. The environment in the wireless zones 121 and 122 where the terminal 100 is located is grasped from the reception state table.

For example, in the terminal 100, when the control signal of the public CS21 is detected at a low level and the control signal of the public CS22 is detected at a low level from the wireless carrier receiving unit 141, the terminal 100 It can be understood that it is located in the shaded area in 122.

Each time the radio carrier receiving section 141 performs a base station capturing operation on the PHS public system 2 and updates the reception state table stored in the reception state storage section 147,
The terminal central control unit 144 compares the reception state table 102 (Table 1) with the reference reception state table 104 (Table 2) stored in the reference state storage unit 148 in advance.

When the terminal 100 enters the area defined in the reference reception state information 105 of the reference reception state table 104 (Table 2), the reception state table 102 (Table 1) matches this, and the setting operation 106 PHS private system 3 described in
The reference state storage unit 148 instructs the terminal central control unit 144 to perform a base station capturing operation to the terminal.

As described above, according to the second embodiment, by storing the information on the reception state of the control signals broadcast by the plurality of radio base stations received in the base station capturing operation, the environment where the terminal is located can be changed to the PHS. It is possible to obtain a more detailed grasp than the conventional method that has been grasped for each public wireless zone, and it is possible to finely control the start of the base station capturing operation for the PHS private system 3 based on this. it can.

FIG. 6 is a schematic diagram showing an operating environment (reception state) to which the present embodiment is applied.

The base station selecting operation when terminal 100 moves from service area 120 of PHS public service system 2 to service area 130 of PHS private service system 3 will be described.

The reference reception state table 104 (Table 2) is stored in the reference state storage unit of the terminal 100 in advance. In the reference reception status table 104 (Table 2), the reception status of the control signals broadcast by the public CSs 21, 22, and 23 of the PHS public system 2 in the vicinity of the wireless zone 131 formed by the private CS 31 is the reference base station status. The information 105 describing the start of the base station capturing operation for the PHS private system 3 is described as the setting operation 106.

In the terminal 100, the public CSs 21, 22, 2
3 is received, and the reception status regarding each wireless base station is recorded in the reception status table 102 (Table 1) regarding the PHS public system 2. The reception status table 102 (Table 1) is updated each time the wireless carrier receiving unit 141 of the terminal 100 performs a base station capturing operation on the PHS public system 2.

Central control section 144 of terminal 100 receives reception state table 102 (Table 1) and reference reception state table 104 (Table 2).
Is compared with the reference base station state information 105, and if it is determined that they match or match, the base station capturing operation for the PHS private system 3 described in the setting information 106 is started.

The terminal 100 is outside the service area 120 of the PHS public system. In this state, the terminal 100
Performs only the base station capturing operation for the PHS public system 2. Radio carrier receiving section 141 of terminal 100
Does not match the reference base station status 105 of the reference status table 104 (Table 2) stored in the terminal, and the terminal 100
The base station capturing operation for the private system 3 is not started.

FIG. 7 is a schematic diagram of an operating environment schematically showing an environment receiving state to which the second embodiment is applied.

Terminal 100 moves from the position shown in FIG.
It has moved into the service area 120 of the public system. When the terminal 100 enters the shaded area in the figure set by the reference base station state information 105 of the stored reference reception state table 104 (Table 2), the terminal 10
0, the reception status table 102 (Table 1) regarding the PHS public system received by the wireless carrier receiving unit 141 and the reference base station status information 10 in the reference reception status table 104 (Table 2).
5 is determined to match. Upon receiving this determination, the terminal 100 refers to the setting operation 106 related to base station selection described in the reference reception status table. Here, as described above, since the operation setting indicating the start of the base station capturing operation for the PHS private system 3 is described in the setting operation 106, the terminal central control unit 144 of the terminal 100 starts this operation.

FIG. 8 is an example of a processing flow of base station selection according to the second embodiment. S10 to S19 are processing blocks executed in the processing flow of base station selection in the present embodiment.

In the state where the standby operation is being performed on the PHS public system 2, in S11, for example, the range of the reception level of the control signal from the standby public CS is degraded, and the switching operation of the standby base station is required. When the terminal central control unit 144 issues a request to start the base station capturing operation after a certain period of time
At 2, the base station acquisition operation is started for the PHS public system. In S13, the wireless carrier receiving unit 141 sets the PH
Update the reception status table 102 (Table 1) for the S public system.

At S 15, terminal central control section 144 reads reference reception state table 1 to be referred from reference state storage section 148.
04 (Table 2), and in S16, information 105 describing the reference reception states of the control signals of a plurality of public CSs of the PHS public system to be referenced is read from the reference reception table 104 (Table 2).

The terminal central control unit 144 compares the reception status table 102 (Table 1) with the information 105 on the reference reception status in S16, and when it is determined that they match or coincides with each other, in S17. In the reference reception state table 10
The setting operation 106 related to base station selection to be performed by the terminal 100 included in Table 4 (Table 2) is read out and executed in S19.

Embodiment 3 As described above, in the second embodiment,
In the terminal 100, a reception state table 102 (Table 1) obtained from reception states of control signals broadcast from a plurality of public CSs,
A reference reception state table 104 (Table 2), in which reference reception states regarding a plurality of public CSs and information instructing the PHS private system 3 to start a standby operation, are compared, and the environment where the terminal 100 is located is grasped in a detailed manner. Based on this, the base station capturing operation for the PHS private system 3 is started. However, in the third embodiment, the base station capturing operation is performed as the setting operation 106 of the reference reception state table 104 (Table 2). It is characterized in that various necessary setting operations are defined, and the terminal 100 performs the operations autonomously. Note that the basic configuration operation from FIGS. 1 to 8 described in the first and second embodiments is the same. Hereinafter, the characteristic configuration operation of the third embodiment will be described with reference to FIGS. 1 to 8 described above.

The setting operation 106 of the reference reception state 104 (Table 2) in the third embodiment includes, for example, starting or stopping a base station capturing operation for an arbitrary wireless communication system, and a reference reception state table already stored. Update of information 105 describing the reference reception state of 104 (Table 2), creation of new reference reception state table 104 (Table 2), reference state storage unit 148
The switching of the reference target of the reference reception state table 104 (Table 2) stored in plurals is described.

In the following, as a setting operation relating to base station capture, a new creation of a reference reception state will be described.

[0094]

[Table 3]

FIG. 10 shows an example of a PHS private system reception status table. Reference numeral 103 denotes a PHS private system reception status table (Table 3). PHS private system reception status table 103
(Table 3) shows, for example, a public CS-ID of a control signal, which is received from a plurality of base stations and received by a base station capturing operation performed on the PHS private system 3, and a terminal of the control signal. The range of the reception level at 100 is included.

This PHS private system reception status table 10
3 (Table 3) is updated each time the wireless carrier receiving unit 141 performs the base station capturing operation on the PHS private system 3 and is stored in the reception state storage unit 147. The terminal 100 updates the reception status table 103 (Table 3) by performing a base station capturing operation on the PHS private system at regular intervals even during the private CS standby.

FIG. 9 is a schematic diagram of an operating environment in which the reference reception state table 104 (Table 2) is newly created autonomously.

The terminal 100 is located inside the wireless zone 131 constituted by the private CS 31, performs a standby operation for the private CS 31, and enjoys the service provided by the PHS private system 3. A setting operation related to a base station selecting operation in a process in which the terminal 100 moves out of the wireless zone 131 from this state will be described.

The reference state storage section 148 of the terminal 100 stores
A reference reception state table 104 is stored. The reference reception status table 104 (Table 2) includes, for example, the wireless zone 131
The self-owned CS in the shaded area in the figure, which is the boundary within
31 and the PHS public system 2
In addition, a setting operation 106 for selecting a base station that defines the start of a base station acquisition operation and the creation of a new reference reception state table is described.

When the terminal 100 moves to the boundary of the radio zone 131 and approaches the shaded area in the figure, the reference reception state 105 described in the reference reception state table 104 (Table 2) and the reception state PHS stored in state storage unit 147
The reception status table 103 for the private system 2 matches.

The terminal central control section 144 reads out the setting operation 106 relating to base station selection in the reference reception state table 104 (Table 2) and executes it.

The terminal 100 performs PHS
The base station capturing operation for the public system 2 is started.
In the reception status storage unit 147, a reception status table 102 (Table 1) of the PHS public system is created. The reception status table 102 (Table 1) includes information about the reception status of the PHS public system 2 that is reported by the public CS around the service area 130 of the PHS private system 3.

Subsequently, the terminal 100 newly creates a reference reception state table according to the above 106.

In this newly created reference reception state table,
For example, the contents of the reception state table 102 (Table 1) obtained by the base station capturing operation performed on the PHS public system 2 are reflected as the reference reception state 105-1. As described above, the reception status table 102 (Table 1) includes information defining an area around the service area 130 of the PHS private system 3.

In the newly created reference reception state table, the setting operation 106-1 relating to base station selection includes:
For example, the start of the base station capturing operation for the PHS private system 3 is specified.

That is, the reference state storage unit 1 of the terminal 100
48 is the service area 1 of the PHS private system 3
In an area around 30, a reference reception state table 104-1 that specifies that a base station capturing operation for the PHS private system 3 is to be started is automatically created.

When the terminal 100 leaves the wireless zone 131, the terminal 100 stops the standby operation for the PHS private system 3 and starts the base station capturing operation and the standby operation for the PHS public system 2. In this state, the terminal 100
Reference reception state table 10 stored in reference state storage section 148
With reference to 4-1 as a reference, each time the reception status table 102 (Table 1) of the PHS public system is updated, the reference reception status table 104-1 is compared with the reception status table 102 (Table 1).

When the terminal approaches the vicinity of the wireless zone 131 again, the reference reception state 10 in the reference reception state table 104-1 is referred to.
When 5-1 and the reception status table 102 (Table 1) enter an area determined to match or match, the terminal central control unit 14
4 reads the setting operation 106-1 related to base station selection in the reference reception status table 104-1. Here, the base station capture operation for the PHS private system 3 is started.

As described above, in the base station selecting operation of the third embodiment, the wireless zone 131 of the PHS private system 3 is used.
Autonomously creates a new reference reception state of the PHS public system 2 in this vicinity in the boundary area of
It is used to start the operation of capturing the base station in the S-owned system 3.

Embodiment 4 In the second embodiment, the reception environment table 102 grasps the environment in which the terminal 100 is located in a detailed manner, determines whether or not the terminal 100 is in an area defined by the reference reception state table 104, and performs a setting operation related to base station selection based on this. 1
However, in the fourth embodiment, a plurality of reference reception state tables 104 (Table 2) are stored, and a plurality of areas are defined thereby, thereby starting the setting operation 106 relating to base station selection. Is performed in an arbitrary area composed of a plurality of areas described above.

FIG. 10 is a schematic diagram of an operating environment representing a case where the base station capturing operation for the PHS private system 3 is started in a plurality of reference reception states.

For example, there is a case where the service area 130 of the PHS private system 3 is configured to be wide, and it is desired to start the operation of acquiring the radio base station for the service area 130. In such a situation, there are a plurality of areas in which the terminal 100 should autonomously start the standby operation on the PHS private system 3.

In this case, the storage unit of terminal 100 stores a plurality of reference base station status tables 104-1 to 104-3. These reference base station status tables describe different reference base station status information 105-1 to 105-3, each of which defines an arbitrary area in the service area of the PHS public system 2.

In terminal 100, radio carrier receiving section 14
1. The reception status table 102 (Table 1) relating to the PHS public system 2 received in step S1.
If it is determined that the packet matches any one of the above-described methods, it starts a base station capturing operation for the PHS private system 3 described in the corresponding reference reception status table.

Embodiment 5 FIG. In the second embodiment, the terminal 1
By constantly comparing the reception status table 102 of the terminal 100 with the reference reception status table 104 stored in advance, the terminal 100
Is determined to be in one area defined by the reference reception state 105, and a setting operation 10 related to base station selection is performed.
However, in Embodiment 5, a plurality of reference reception state tables 104 are stored in the reference state storage unit 148, and these reference targets are autonomously switched by the terminal 100.
The present invention is characterized in that a setting operation relating to more detailed selection of a base station is performed by switching an area defined in the reference reception state table. Note that the basic configuration operation in FIGS. 1 to 8 described in the first and second embodiments is the same.
Hereinafter, the characteristic configuration operation of the fifth embodiment will be described with reference to FIGS. 1 to 8 described above.

FIG. 11 is a schematic diagram of an operating environment showing a base station selecting operation when the service area of the PHS private system 3 exists as a plurality of independent areas.

Reference numerals 31 and 32 denote private zones, and 131 and 132 denote wireless zones formed by the private CSs 31 and 32, respectively. Wireless zone 121,1 of public CS21,22,23
PHS public system 2 composed of 22 and 123
In the service area 120, self-owned CSs 31, 32
The service areas 131 and 132 of the PHS private system 3 configured by wireless zones 131 and 132 are arranged. The wireless zones 131 and 132 exist as independent areas without touching boundaries.

[0118] From the state where the terminal 100 receives the control signal notified by the self-service CS 31 in the wireless zone 131,
The base station selecting operation until the mobile station 32 moves within the service area 120 of the PHS public system 2 and enters the wireless zone 132 to receive the control signal notified by the self-service CS 32 will be described.

[0119] In the terminal 100, operation settings relating to the base station selecting operation in a plurality of arbitrary areas in the PHS public service area 120 are specified in advance. These setting operations are defined in reference reception state tables 104-1 to 104-4, which include information on the reference base station state in the arbitrary area and operation settings on the base station selection operation. The reference state tables 104-1 to 104-4 are stored in the reference state storage unit 148 of the terminal 100.

First, terminal 100 is in a state of receiving a control signal reported by self-service CS 31 in wireless zone 131. In this state, the base station capturing operation for the PHS public system 2 is stopped. When the terminal 100 starts moving and goes out of the wireless zone 131, the self-service CS3
1 cannot be received. Therefore, the terminal 100 starts a base station capturing operation for the PHS public system 2. Radio carrier receiving section 1 of terminal 100
Reference numeral 41 updates the reception status table 102 based on the base station capturing operation for the PHS public system 2.

The reference state storage section 148 stores a reference reception state table 104-1 which defines the start of the base station capturing operation for the PHS private system 3. The reference reception state table 104-1 describes information on reception states of a plurality of reference base stations of the PHS public system 2 in an area close to the wireless zone 131.

If the terminal 100 is near the radio zone 131, the reference base station state in the reference reception state table 104-1 matches the reception state table 102 of the terminal 100.
The terminal 100 starts a base station capturing operation to the PHS private system 3. However, the terminal 100 is in the wireless zone 1
Because it is moving away from 31
1 cannot be received, and the standby operation for the PHS private system 3 is not started.

The terminal 100 moves further, and the public CS 21
Wireless zone 121 and public CS22 wireless zone 122
Enters the area where. In the above area, an operation of setting the reference reception status table 104-1 as a reference target among a plurality of reference reception status tables stored in the storage unit of the terminal 100 is specified as a setting relating to base station selection.

[0124] In the storage unit of terminal 100, reference reception state table 104-2 defining an operation of switching reference reception state table 104-1 to a reference target is stored. The reference reception status table 104-2 includes a wireless zone 121 of the public CS21.
Information on the reception states of a plurality of reference base stations of the PHS public system 2 in an area where the public zone and the wireless zone 122 of the public CS 22 overlap.

In an area where the wireless zone 121 of the public CS21 and the wireless zone 122 of the public CS22 overlap,
The reception status table 102 received by the wireless carrier reception unit 141 of the terminal 100 matches the reference reception status table 104-2. The terminal 100 transmits the corresponding reference reception status table 104-
2 is performed to specify the reference target in the reference reception status table 104-1. However, here, the reference reception state table 1
No. 04-1 is already a reference target, so that no change occurs in the setting operation particularly related to base station selection.

The terminal 100 further moves to the public CS22
Wireless zone 122 and public CS23 wireless zone 123
Enters the area where. In the above area, an operation of setting the reference reception state 104-4 as a reference target among the plurality of reference reception state tables stored in the storage unit of the terminal 100 is specified as a setting relating to base station selection.

The reference reception state table 104-4 stores a setting operation 106-4 that defines the start of the base station capturing operation for the PHS private system 3. In this reception status table, information 105-4 regarding the reception status of a plurality of reference base stations of the PHS public system 2 in an area close to the wireless zone 132 is described.

The storage unit of the terminal 100 stores a reference reception status table 104-3 which defines an operation of switching the reference reception status table 104-4 to a reference target. This reference reception status table 104-3 includes the wireless zone 1 of the public CS22.
Information on the reception status of a plurality of reference base stations of the PHS public system 2 in an area where the wireless zone 123 and the wireless zone 123 of the public CS 23 overlap is described.

In an area where the wireless zone 122 of the public CS 22 and the wireless zone 123 of the public CS 23 overlap,
Since the reception status table 102 received by the wireless carrier receiving unit 141 of the terminal 100 matches the reference reception status table 104-3, the reference reception status table 104-4 described in the reference reception status table 104-3 Specification to the reference target is performed.
Thereafter, each time the wireless carrier receiving unit 141 performs a base station capturing operation on the PHS public system 2 and updates the reception status table 102, the reference reception status table 104-4 is referred to as a reference target.

[0130] Further, the terminal 100 moves to the self-owned CS3.
When approaching the vicinity of the second wireless zone 132, the reception status table 102 and the reference reception status table 104-4 match. Here, the terminal 100 starts the base station capturing operation for the PHS private system 3 described in the reference reception state table 104-4. Since the terminal 100 is approaching the wireless zone 132, the terminal 100 can receive the control signal reported by the private CS 32, the standby operation for the PHS private system 3 is started, and the provided service can be used.

In the above-described embodiment, a plurality of reference reception state tables 104 to be referred to are written and set in advance in the storage unit of terminal 100. May be manually set at the beginning of use or at any time. In addition, the PHS private system 3 of the terminal 100
The radio carrier receiving unit 141 starts the radio base station capturing operation for the PHS public system, which is started after the registration operation to the PHS public system.
A reference reception state table may be created with reference to the reception state tables 102 of a plurality of wireless base stations received by the communication base station. A reference reception state table may be created by referring to the reception state table 102 according to an instruction from the communicating radio base station, or information about the contents of the reference reception state table is included in the instruction from the radio base station. Then, a reference reception state table may be created based on this instruction.

Further, based on the reception state of the control signals received from a plurality of radio base stations belonging to the narrow area service network, the position information of terminal 100 in the narrow area service network obtained is used to determine the base station selection operation for the wide area service network. If it can be used for setting, it may be defined in the reference reception status table and used for setting the base station selection operation for the wide area service network.

As described above, in the present embodiment, in the terminal 100 which can use the services provided by a plurality of wireless communication systems called a wide area service network and a narrow area service network, a plurality of terminals belonging to any one of the wireless communication systems A reception state table 102 of a control signal broadcast from a wireless base station and a reference reception state table 104 including information on a spatial arrangement relationship between a service area of a wide area service network and a service area of a narrow area service network. By comparing and referring, the terminal 100 grasps the spatial position information within the above wireless communication system in a detailed manner, and performs an appropriate base station selecting operation of the wireless communication system from this information. Therefore, it is possible to selectively and automatically stop and start the base station selection operation for the wireless communication system that is obviously outside the service area, and it is possible to reduce the power consumption of the terminal 100.

[0134]

As described above, according to the present invention, the base station identification code and the range of the reception level are detected, the surrounding environment of the terminal is grasped from the information on the reception state, and the reference reception state is determined. , The terminal determines whether or not it is near the service area of the second service network, and starts the base station capturing operation based on the determination result. Therefore, the spatial area where the terminal starts the base station acquisition operation for the second service network can be limited in the reference reception state, and the power consumption of the terminal can be suppressed low.

[Brief description of the drawings]

FIG. 1 is a schematic diagram of an operation environment of a terminal to which Embodiment 1 is applied;

FIG. 2 is an identification code of the wireless base station according to the first embodiment.

FIG. 3 is a basic configuration diagram of a terminal to which Embodiment 1 is applied;

FIG. 4 is an operation environment schematic diagram schematically illustrating the environment of the first embodiment.

FIG. 5 is an operation environment schematic diagram schematically illustrating the environment of the second embodiment.

FIG. 6 is a schematic diagram of an operating environment schematically showing the environment of the second embodiment.

FIG. 7 is an operation environment schematic diagram schematically illustrating the environment of the second embodiment.

FIG. 8 is a processing flow relating to a base station selecting operation according to the second embodiment.

FIG. 9 is an operation environment schematic diagram schematically illustrating the environment of the second embodiment.

FIG. 10 is an operation environment schematic diagram schematically illustrating the environment of the fourth embodiment.

FIG. 11 is a schematic diagram of an operating environment schematically showing an environment according to a fifth embodiment.

FIG. 12 is a schematic diagram of an operation environment of a terminal shown as a conventional example.

FIG. 13 is a basic configuration diagram of a terminal shown as a conventional example.

FIG. 14 is a processing flow for setting the start of a base station acquisition operation for a narrow area service network of a terminal shown as a conventional example.

[Explanation of symbols]

140 antenna, 141 wireless carrier receiving unit, 14
2 wireless carrier transmission unit, 143 storage unit, 144 terminal central control unit, 145 external I / F, 146 wireless carrier reception level monitoring unit, 147 reception state storage unit, 148
Reference state storage unit.

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int.Cl. ⁷ , DB name) H04B ^7/ 24-7/26 102 H04Q ^7/ 00-7/38

Claims (5)

(57) [Claims] 1. A receiving means for reading a base station identification code included in a control signal broadcast from a radio base station, a reception level monitoring means for detecting a range of the reception level of the control signal, and a detected base station identification Reception state storage means for storing a range of a code and a reception level as information on a reception state regarding the control signal; and a terminal in an area in which the terminal automatically starts a base station acquisition operation for the second service network. Reference state storage means for storing, as information relating to a reference reception state, an identification code of a radio base station to be referred to and belonging to one service network, and information relating to a reference reception state; Based on the comparison result, and based on the information on the reception state of the control signal, the terminal determines the surrounding environment. A base station selection operation for starting a base station acquisition operation for a second service network when a terminal enters a predetermined area. 2. The reception state storage means stores information on reception states of control signals broadcast from a plurality of radio base stations receivable by a terminal, and the reference state storage means stores a plurality of radio base stations to be referred to. Information on the reference reception state of the control signal of the station is stored in advance, from the information on the reception state of a plurality of control signals, to grasp the surrounding environment of the terminal more finely, when the terminal enters a predetermined area, The base station selection method according to claim 1, wherein a base station acquisition operation for the second service network is started. 3. The reference state storage means stores information on an arbitrary setting operation to be performed by the terminal when the terminal is within an area defined by the reference reception state, and the terminal specifies the information based on the information on the reference reception state. 3. The base station selection method according to claim 2, wherein when the mobile terminal enters an area to be set, the setting operation is started based on the stored information on an arbitrary setting operation to be performed by the terminal. 4. The reference state storage means stores a plurality of pieces of information relating to a reference reception state and an arbitrary setting operation relating to base station selection, and the terminal stores a plurality of pieces of information respectively defined based on the plurality of pieces of reference reception state information. 3. The base station selection method according to claim 2, wherein when any one of the areas is entered, information on an arbitrary setting operation for the corresponding reference reception state is referred to and the setting operation is started. 5. A reference state storage means for storing a reference reception state table relating to reference target switching, in which the reference base station state and information defining a switching operation of a reference target of the plurality of stored reference reception state tables are described. Characterized in that, when the terminal enters the area defined by the reference reception state table related to the above-mentioned reference target switching, the reference target of another plurality of reference reception state tables is automatically switched. 3. The base station selection method according to claim 2, wherein: