JP3025115B2 - Base station allocation method to mobile station in mobile communication - Google Patents

Abstract

PURPOSE:To allocate a mobile station to a substantial base station by allowing the mobile station to measure a reception level of a control line of each base station and discriminating the base station through the use of the level information. CONSTITUTION:When mobile station 2 makes a request of position registration or talking service, the mobile station 2 measures a reception level of control lines from plural base stations to obtain reception level information 2a and uses a control line with a highest reception level to make a call to a relevant base station. A service request reception section 10 of the base station 1 receives the request and gives reception level information 10a to a level discrimination section 11, in which the level is discriminated. When the reception level of a control line of a peripheral base station is higher, it is discriminated that the mobile station 2 is resident in a radio zone of the base station 1, a service execution section 13 is started to serve the requested service. On the other hand, when the reception level of the surrounding base station is lower, it is possible that the mobile station 2 is not resident in the radio zone of the base station 1, the requested service is rejected or the request is sent to other base station.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for allocating base stations to mobile stations in mobile communication. In recent years, mobile communication services for mobile stations such as car phones and mobile phones have been gradually spread. Mobile communication is transmitted by a control line (called perch) from a base station managing each wireless zone to a mobile station in the zone monitoring the wireless zone. For this control line (perch), a unique frequency is determined for each wireless zone.

When a mobile station detects the reception level of the control line, each mobile station knows its current wireless zone, and requests a service to a base station in the wireless zone. In this case, the base station provides a mobile communication service under the control of the base station in the wireless zone having the highest reception level from the reception level of each wireless zone measured by the mobile station.

[0003] However, the reception level measured by the mobile station may be high when the reception level of a base station different from the base station under the control of the original base station becomes high due to various factors such as geographical relationship where the mobile station is located and frequency interference. In that case, even if the service is requested, the service cannot be executed normally.

[0004]

2. Description of the Related Art FIG. 6 is a diagram showing a relationship between a radio zone and a mobile station in conventional mobile communication. In the figure, base stations BS1 to BS1 are respectively assigned to a plurality of wireless zones 1 to 4 represented by circles.
S4 is arranged, and a control line (called a perch) having a unique frequency f1 to f4 is provided from each base station.
Has been sent. The reception level of the signal on the control line is measured by the mobile station MS, and when a control line with the highest reception level is detected, a service is requested to the base station transmitting the signal on the control line. That is, for the control line signal transmitted from each base station, location information (used for charging, incoming call, etc.), a location service for registering a location to the base station, and a call service request for requesting a call are made. Information (frequency) for multiple channels for control signals for
The mobile station MS makes a service request using the information contained in the control line having the highest reception level.

On the other hand, in order to effectively utilize radio frequencies due to an increase in the number of mobile communication subscribers, the radius of a radio zone is reduced, and the installation condition of a base station for controlling a radio zone is deteriorated (for example, radio waves on the rooftop of a building are not necessarily used) In some cases, different phenomena may occur between the physical zone configuration and the radio wave condition zone configuration.

In the example of FIG. 6, when the mobile station MS is mounted on an automobile running on an elevated highway, the mobile station MS may have frequency interference and a relative positional relationship with the base station. The control line (frequency f5) of the base station BS5 in the wireless zone distant from the base stations BS1 to BS4 is detected as the highest reception level among the control lines of the other surrounding base stations BS1 to BS4 There is.

[0007] In this case, the mobile station MS issues a service request to the base station BS5 on the frequency of the control channel specified by the control channel (f5). That is, it is determined that the radio wave is located in the wireless zone of the base station BS5 as the radio wave condition, and a determination different from the physical zone is made.

[0008]

In the case of FIG. 6, the mobile station MS is managed by another base station BS5 which is different from the base station (one of BS1 to BS4) to be originally managed. In this case, if the mobile station MS moves even if a call is started by requesting a call service and using the assigned call line, it is necessary to switch the call line accompanying the shift of the radio zone. Base station (not shown)
In such cases, the communication line assigned to the mobile station MS cannot be detected because the distance is long, so that switching cannot be performed. In this case, the call cannot be continued.

Further, even if a location service for performing location registration is requested, services specific to mobile communication, such as the inability to accurately identify the location of a mobile station, are not possible. According to the present invention, when a service request is issued from a mobile station other than the wireless zone managed by the base station, the mobile station can be assigned to the original base station by detecting that the base station is erroneously assigned. An object of the present invention is to provide a method for allocating base stations to mobile stations in mobile communication.

[0010]

FIG. 1 is a block diagram showing the principle of the present invention. In FIG. 1, 1 is a base station, 10 is a service request receiving unit, 10a is reception level information of a control line (perch) transmitted from each base station measured by a mobile station, 11 is a level determination unit, and 110 is a peripheral base station. First receiving level determining means for determining a station level; 111, a second receiving level determining means for determining an out-of-neighbor base station level;
Reference numeral 13 denotes a service execution unit, 14 denotes a means for generating a request to another base station, 2 denotes a mobile station, and 2a denotes reception level information which is a detection result of a reception level of a control line from each base station received by the mobile station.

According to the present invention, a mobile station issues a request to a base station different from the base station under its jurisdiction by using a reception level at the time of receiving a control line of each base station reporting to the base station. The mobile station is identified and assigned to the base station that should be under the jurisdiction.

[0012]

When the mobile station 2 requests a location registration or call service, it measures reception levels of control lines from a plurality of receivable base stations and obtains reception level information 2a. The service request is transmitted to the corresponding base station using the line information (frequency of the transmission control line) included in the control line having the highest reception level among the plurality of received control lines. The service request includes the reception level information 2a of each control line measured by the mobile station 2.

In the base station 1, when the request is received by the service request receiving unit 10, the received reception level information 10
a is supplied to the level determination unit 11 to start the level determination operation. First, the first reception level determination means 110
The reception level of each control line (corresponding to each base station) transmitted from a base station near the base station 1 included in the reception level information 10a is determined. In this determination, if the reception level of the control line of the peripheral base station is high, the mobile station 2
In order to provide the service (location service or call service) requested by the mobile station 2 assuming that the mobile station 2 is located in the wireless zone, the response unit 12 is driven and the service execution unit 13 is activated.

When the first reception level determination means 110 determines that the reception level of the peripheral base station is low, the mobile station 2 may not be located in the wireless zone of the base station 1. In this case, the second reception level determination unit 111
In step (1), the reception level of the control line of a remote base station other than the base station in the vicinity of the base station 1 is determined using the reception level information 10a. If the reception level is low, the mobile station 2 is not located in the radio zone of another distant base station. If the service request is a call service, the response unit 12 sends a request to the mobile station 2. A rejection notification is made, and in the case of a location service, the service execution unit 13 is instructed to execute the location service.

When the second reception level judgment means 111 judges that the reception levels of the base stations other than the neighboring base stations are high, the base station having the control line with the highest reception level among the base stations is determined by the mobile station 2. Is a base station that has jurisdiction over the wireless zone in which is located. In this case, if the type of the service request is the location service, the service is refused because the mobile station in another zone cannot be registered in the base station 1. When the type of the service request is the call service, the request generation unit 14 for the other base station is activated. The request generation means 14 for the other base station transmits a service request (call) from the mobile station 2 to the other base station via a higher-level base station control station (not shown) or the like.

[0016]

FIG. 2 is a configuration diagram of a mobile communication system in which the present invention is implemented. Base stations 1-1 to 1-7 are provided in a plurality of wireless zones 1 to 7, respectively, and control lines (perch) frequencies f1 to f1 in the respective zones are provided.
f7 is used. 1-1 to 1-7 are base stations, 2 is a mobile station (MS) such as a mobile phone, a mobile phone, or the like;
Reference numeral 3-2 denotes a base station control station for controlling the base station, and reference numeral 4 denotes a mobile exchange.

The base stations 1-1 to 1-3 are connected to the higher-level base station control station 3-1 by wire, and the base stations 1-4 to 1-7 are connected.
Is connected to the higher-level base station control station 3-2. Each of the base station control stations 3-1 and 3-2 is connected to a higher-order mobile switching center 4 by wire, and the mobile switching center 4 is further connected to another switching unit (not shown) for mobile communication such as a mobile telephone. Office (MS)
For 2, the telephone exchange is performed via the base station, the base station control station, and the mobile switching center. Each base station allocates a mobile station according to the present invention in response to a request for a location service (location registration) or a call service from the mobile station, and notifies execution or rejection of the service.

FIG. 3 shows a control flow of mobile station assignment for a call service request in the base station, FIG. 4 shows a control flow of mobile station assignment for a position service request in the base station, and FIG. 5 shows an example of a reception level of the mobile station with respect to the radio zone. It is.

First, the example of FIG. 5 will be described.
S1 to BS8 are arranged as shown in the figure, and control lines (perch) of frequencies f1 to f8 are transmitted to radio zones represented by circles, respectively. In this example, when the mobile station MS is actually located in the wireless zone of the base station BS2, the reception level of the control line from each base station is measured to request a service. It is assumed that a level value (measured value of the mobile station MS) as shown in each wireless zone in FIG. 5 has been obtained due to the interference with the base station, the location of the base station, the location of the mobile station, and the like. In this case, actually BS2
The mobile station MS located in the wireless zone of
Since it is detected that the control line (frequency f5) of S5 is the maximum reception level "11", the base station BS5
A request for a location service or a call service is made to the base station 5 using the frequency information of the control line included in the control line (including position information and the like).

The control flow of the call service request of FIG. 3 will be described with reference to the example of FIG. In FIG. 3, reference numeral 30 denotes a mobile station (MS), 31 denotes a destination base station (BS) of a service request, and 32 denotes a non-peripheral base station (BS).

The mobile station MS is a base station 31 (B in the example of FIG. 5).
A call service request is transmitted to S5) (a in FIG. 3). This request includes the reception level information of the control line from each base station as shown in FIG. 5 detected by the mobile station MS. Based on the reception level information, the base station 31 determines whether or not the reception levels of the base stations near the base station are high (b in FIG. 3). At this time, if it is found that the reception level around the own base station is high, it is known that the mobile station MS exists in the wireless zone of the own base station.
Is provided with a call service (c in FIG. 3).

In the example of FIG. 5, when the reception levels of the base stations BS4, BS6, and BS7 around the own station (BS5) are taken out, they are Level 2, Level 1, and Level 5, and the reception level of the own base station is 11 It is detected that it is much lower than that.
In this case, the base station BS determines whether the reception level of the surrounding non-peripheral base station 32 is high (d in FIG. 3). In the case of FIG. 5, the reception level of the base station 32 outside the vicinity of the base station BS5 is determined to be YES because BS2 is at level 10, BS1 and BS3 are at level 9 and BS8 is at level 8. in this case,
The base station 31 that has received the service request does not exist in the wireless zone where the mobile station MS exists, and in fact,
2 (in the example of FIG. 5, the base station B having the maximum reception level outside the surrounding area)
It is located in the wireless zone of S2). Therefore, the mobile station MS is notified of the acceptance of the call service (FIG. 3).
(F) together with the call service request to the corresponding out-of-neighbor base station 32 (g in FIG. 3).

As shown in the system configuration of FIG. 2, this call service request is transmitted to a destination outside base station via a base station control station connected by wire. In this case, information on the requested call service and information on the mobile station MS are transmitted. Receiving this, the non-peripheral base station 32 (the base station BS2 in the example of FIG. 5) provides a call service to the mobile station MS (h in FIG. 3).

When the base station determines whether the reception level of the non-surrounding base station is high (d in FIG. 3), and when the reception levels of the non-surrounding base stations are all low, the mobile station MS exists. Assuming that the wireless zone cannot be determined accurately,
A notification to reject the call service is transmitted (e in FIG. 3).

Next, in the case of the location service shown in FIG. 4, a location service request from the mobile station MS (which also includes reception level information on each base station) is sent to the base station 31 having the maximum reception level. Is transmitted (FIG. 4A). The base station 31 determines whether the reception level of the peripheral base station is high as in the case of the above-mentioned call service request (FIG. 4B), and if it is high, provides the location service (FIG. 4C). In this position service, unlike the call service, a process of simply registering the position of the mobile station MS to a higher station through a base station is performed.

If the reception level of the peripheral base station is low, it is determined whether the reception level of the base station outside the peripheral is high (d in FIG. 4).
If the reception level of the base station outside the vicinity is low, the mobile station M
S provides location services as if they were in the wireless zone of base station 31 (FIG. 4e).

When the reception level of the base station outside the vicinity is high,
Since the location is different from the location of the wireless zone of the base station 31, location registration cannot be performed by the base station 31 (for example, when the base station 31 is in contact with a border of a prefecture). A rejection notification is made (f in FIG. 4).

[0028]

According to the present invention, it is possible to prevent the provision of services to a mobile station by a base station out of the jurisdiction depending on the radio wave condition, the installation position of the base station, the position of the mobile station, etc. Factors can be reduced and erroneous registration in the location service can be prevented.

As a result, it is possible to improve the serviceability to the user in mobile communication.

[Brief description of the drawings]

FIG. 1 is a principle configuration diagram of the present invention.

FIG. 2 is a configuration diagram of a mobile communication system in which the present invention is implemented.

FIG. 3 is a control flow of mobile station assignment to a call service request in a base station.

FIG. 4 is a control flow of mobile assignment for a location service request in a base station.

FIG. 5 is an example of a reception level of a mobile station with respect to a wireless zone.

FIG. 6 is a diagram showing a relationship between a wireless zone and a mobile station in conventional mobile communication.

[Explanation of symbols]

 Reference Signs List 1 base station 10 service request receiving section 11 level determining section 110 first receiving level determining section 111 second receiving level determining section 12 responding section 13 service executing section 14 request generating section to other base station 2 mobile station

──────────────────────────────────────────────────続 き Continuation of the front page (72) Inventor Yoshiki Yamazaki 3-18-18 Shin-Yokohama, Kohoku-ku, Yokohama-shi, Kanagawa Prefecture Inside Fujitsu Communication Systems Co., Ltd. (56) References JP-A-5-67996 (JP, A JP-A-2-44929 (JP, A) JP-A-4-51618 (JP, A) (58) Fields investigated (Int. Cl. ⁷ , DB name) H04Q 7/00-7/38 H04B 7 / 24-7/26 102

Claims (3)

(57) [Claims] In a method of allocating a base station to a mobile station in mobile communication in which a base station is provided for each wireless zone and a control line having a unique frequency is allocated from each base station, the mobile station includes a plurality of wireless stations. The reception level of the control line in the zone is measured, and the signal for transmitting a service request to the base station specified by the control line that has detected the maximum reception level includes the reception levels of other control lines. The base station that receives the service request uses the information on the reception level of each control line sent from the mobile station to determine the reception level of the control line from the base station in the vicinity of the own base station and to determine the reception level of the control line from the base station outside the vicinity. A mobile communication characterized by determining whether the service requested by the mobile station is executed by the own base station or rejected by determining the reception level of the control line. Base station allocation method to the mobile stations that. 2. The mobile communication system according to claim 1, wherein when the service request from the mobile station is a call service request, the requested base station determines whether or not the reception level of the base station in the vicinity of the own base station is high. A call service is provided. When the reception level is low, the reception level of another base station outside the surrounding area is determined. When the reception level of the other base station outside the surrounding area is low, the service is rejected. A method for allocating a base station to a mobile station in mobile communication, comprising requesting the station to execute a call service requested by the mobile station. 3. The base station according to claim 1, wherein, when the service request from the base station is a location service request for performing location registration, the base station that has received the request determines whether the reception level of a base station in the vicinity of its own base station is high. If the reception level of another base station outside the vicinity is low, the location service is executed. If the reception level of the other base station outside the vicinity is low, the location service is executed. A method for allocating a base station to a mobile station in mobile communication, characterized by rejecting the location service.