JP2968743B2 - Mobile communication handover control system - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a handover control system for mobile communication, and more particularly to a handover control system for cellular mobile communication.

[0002]

2. Description of the Related Art In mobile communication, when a mobile station moves from a zone of a communicating base station to a zone of an adjacent base station, handover is performed to prevent a call interruption due to deterioration of a reception state. It is carried out. That is, reception control is performed to switch to communication with a base station in a zone having good reception conditions.

[0003] For example, according to Japanese Patent Application Laid-Open No. 7-321734, a portable telephone is provided with a position detecting (GPS) device to report position information and power information to a base station. On the other hand, the base station uses the location information and power information of the mobile phone, and the building, weather information, location information, and the like in the area of the base station to notify the demodulation method so that the mobile phone can perform optimal reception. Or handover to an optimal base station by supplying transmission data. By doing so, it is possible to perform optimal reception even when the mobile phone is located in a zone where radio waves are insensitive.

[0004]

In the above-mentioned conventional example,
In a base station, handover is performed to an optimal base station using location information and power information of a mobile phone, and building, weather information, location information, and the like in the area of the base station. However, in a cellular mobile communication system, handover is performed in sector units, so when data is changed for handover optimization in some areas, handover was normally performed before the change. In a region, there is a problem that a handover failure occurs after data change.

SUMMARY OF THE INVENTION It is an object of the present invention to smoothly perform an optimal handover even when data for a handover optimization is changed for a mobile station passing through a specific area where handover failures frequently occur. It is an object of the present invention to provide a mobile communication handover control system.

[0006]

SUMMARY OF THE INVENTION A handover control system for mobile communication according to the present invention specifies an area in which call disconnections occur frequently due to poor handover, and is suitable for location information in this specific area and mobile stations in the specific area. A memory in which specific handover data is pre-stored is installed at the exchange side, and a GPS is provided at the mobile station side, and the location information is always transmitted to the exchange via the base station. When the mobile station is notified and the mobile station located in the specific area is identified, the specific handover data is transmitted to the mobile station to force the handover to be performed.

[0007]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, the present invention will be described with reference to the drawings.

FIG. 1 is a configuration diagram of a handover control system according to an embodiment of the present invention. Service area 4a of base station 2a and service area 4b of base station 2b
And the service areas 4a, 4b
In a specific area 5 near the boundary of, call disconnection due to poor handover occurs frequently. The road 6 continues through the specific area 5, and the mobile station 1 performs a call via the base station 2 while moving from the service area 4 a to the service area 4 b along the road 6. The exchange 3 communicates with the mobile station 1 via the base station 2.

FIG. 2 shows a mobile station 1, a base station 2 and a switching station 3.
FIG. The mobile station 1 is provided with a GPS 11 for detecting the current position, and constantly transmits the current position information of the mobile station to the base station 2 via the antenna 13.

The base station 2 always receives the position information transmitted from the mobile station 1 by the antenna 23 and the position information receiving device 21, and constantly sends the received position information of the mobile station to the exchange 3. Further, the base station radio apparatus 22 is connected to the exchange 3
, The information addressed to the mobile station transmitted from the exchange 3 is transmitted from the antenna 23, and the information addressed to the exchange transmitted from the mobile station 1 is transmitted to the exchange 3.

The exchange 3 has a specific area recording device 31 which stores in advance the location information of a specific area (specific area 5 in FIG. 1) where handover failures frequently occur, and a specific hand for mobile stations in the specific area. The specific handover data storage device 32 in which over-data (optimal handover data not used in normal setting) is stored in advance, and the normal hand-over data storage device 33 in which normal hand-over data is stored in advance. Have.

The exchange 3 has a position identification device 34 for identifying whether or not the mobile station is located in a specific area.
A handover data rewriting device 35 for transmitting specific handover data to a mobile station located in a specific area.

Next, the operation will be described.

In FIG. 1, when the mobile station 1 reaches the specific area 5, the exchange 3 receives the current location information of the mobile station via the base station 2a. The position identification device 34 of the exchange 3 shown in FIG. 2 collates the mobile station current position information received via the base station 2a with the position information of the specific area 5 stored in the specific area recording device 31, It identifies that the mobile station 1 is located in the specific area 5 and notifies the handover data rewriting device 35.

The handover data rewriting device 35 reads the specific handover data preset for the specific area from the storage device 32, and reads the normal handover data read from the normal handover data storage device 33 into the specified handover data. After being rewritten by the handover data, the data is transmitted to the base station 2a and transmitted to the mobile station 1 via the base station wireless device 22.

The mobile station radio equipment 12 of the mobile station 1 located in the specific area 5 receives specific handover data via the base station 2a, forcibly executes handover based on this data, and Switch to communication with

Since the handover data in the specific area and the normal handover data are independent of each other, even if the data is changed, there is no other influence.

[0018]

As described above, according to the present invention, an area where call disconnection occurs frequently due to a handover failure is specified, and location information of this specific area and specific handover data for a mobile station in the specific area are specified. A memory stored in advance is installed on the exchange side, while a GPS is provided on the mobile station side so that the location information is always reported to the exchange via the base station. When the handover data is identified, the specific handover data is transmitted to the mobile station to force the handover, so that even if the handover data is changed, the optimal handover is smoothly performed without affecting the others. Can be executed.

[Brief description of the drawings]

FIG. 1 is a configuration diagram of a handover control system according to an embodiment of the present invention.

FIG. 2 is a block diagram showing a mobile station 1, a base station 2, and an exchange 3 shown in FIG.

[Explanation of symbols]

 REFERENCE SIGNS LIST 1 mobile station 2 base station 3 switching station 4 service area 11 GPS 12 mobile station radio device 21 location information receiving device 22 base station radio device 31 specific area recording device 32 specific handover data storage device 33 normal handover data storage device 34 location Identification device 35 Handover data rewriting device

Claims (3)

(57) [Claims] 1. A mobile communication handover control system in which an exchange controls a base station and a mobile station, wherein the exchange stores in advance position information of a specific area where handover failures occur frequently. A specific area storage means, a specific handover data storage means which stores in advance specific handover data enabling an optimal handover to a mobile station in the specific area, and wherein the mobile station is located in the specific area. Position identification means for identifying whether or not it is located, and when the position identification means identifies a mobile station within the specific area, reads data from the specific handover data storage means and Means for transmitting to a mobile station in a specific area. 2. The exchange according to claim 1, further comprising a normal handover data storing means for preliminarily storing normal handover data, and said specific handover data transmitting means, wherein said location identification means is located within said specific area. 2. The mobile communication handover control system according to claim 1, further comprising means for rewriting the normal handover data with the specific handover data and transmitting the specific handover data when the mobile station is identified. 3. The mobile station has means for constantly transmitting current position information detected by GPS, and the position identification means of the exchange receives the current position information via the base station and performs the identification. The mobile communication handover control system according to claim 1, wherein the mobile station located in the area is identified.