JP2002159034A - Apparatus and method for radio communication as well as storage medium - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an apparatus and a method for radio communication capable of shortening a time up to an improvement in a communication quality as well as a storage medium. SOLUTION: The method for radio communicating comprises the steps of detecting a moving speed of a mobile station 502 around a deterioration of the communication quality when the quality is deteriorated between a mobile station 502 and a base station 501 during communicating so that, even if a transmitting power is increased in a possible range, prescribed communication quality cannot be obtained, preferentially selecting a frequency hand-over if the moving speed is less than a threshold value, or preferentially selecting a diversity hand-over if the speed is the threshold value or more. Thus, the hand-over means seeming to be able to improve the quality can be preferentially selected, and a time up to the improvement in the quality can be shortened.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a wireless communication device and method, and a storage medium, and more particularly to a wireless communication device and method in a mobile communication system, and a storage medium.

[0002]

2. Description of the Related Art FIG. 5 shows an overall configuration of a mobile communication system to which the present invention is applied.

[0003] A mobile communication system includes a base station 501 of a wireless communication device forming a communicable wireless zone and a mobile communication telephone 50 as a mobile station existing in the wireless zone.
2. A plurality of wireless communication devices such as a mobile communication videophone 503 and a mobile communication information terminal 504.

FIG. 6 shows a schematic configuration of the base station 501 shown in FIG.
FIG. 6A shows a schematic configuration of the mobile stations 502 to 504 in FIG.

[0005] As shown in FIG. 6A, the base station 501 mainly includes an RF unit 601 for performing transmission / reception processing of a radio link.
A modulation / demodulation section 602 for performing digital modulation / demodulation processing and the like, a channel codec section 603 for performing codec decoding of data,
It comprises a digital network interface unit 604 for connecting to a public or private digital network, and a base station control unit 605 for controlling all of these units.

As shown in FIG. 6B, the mobile stations 502 to 504 mainly include an RF unit 606 for performing transmission / reception processing of a radio link and a modulation / demodulation unit 607 for performing digital modulation / demodulation processing and the like.
And a channel codec unit 60 for codec-decoding the data
8, an input / output unit 609 for controlling a microphone, a speaker, an imaging unit, an image monitor, and the like, and a mobile station control unit 610 for controlling all of these units.

In the above-mentioned conventional mobile communication system,
When the communication quality between the communicating mobile station and the base station deteriorates, the communication power is increased by increasing the transmission power value or performing a diversity handover by judging that the distance to the communicating base station has increased. Has been improved. As another method for improving the communication quality other than the above, there is a frequency handover.

For example, Japanese Patent Application Laid-Open No. H11-341555 aims to prevent a frequency handover from affecting other mobile communication systems, and to provide a method in which a plurality of base stations exist in the same service area. Discloses a method of selecting a frequency between a base station and a mobile station

[0009]

However, in communication by the code division multiple access system (CDMA), since the same frequency is used by a plurality of mobile stations at the same time, the mobile station moves and moves away from the base station. Without this, the communication quality may be degraded. When the communication quality is degraded in this way, the distance between the base station and the mobile station does not change, so that it is unlikely that the communication quality will improve even if diversity handover is performed. Further, in the method of improving the communication quality by increasing the transmission power, interference with other mobile stations is caused, and therefore, the upper limit of the transmission power that can be increased is determined. On the other hand, Japanese Patent Application Laid-Open No. H11-341555 does not disclose any conditions for performing a frequency handover.

[0010] The present invention has been made in view of the above problems, and has as its object to provide a wireless communication apparatus and method, and a storage medium that can reduce the time required to improve communication quality.

[0011]

According to a first aspect of the present invention, there is provided a wireless communication apparatus for communicating with a base station, wherein the wireless communication apparatus performs communication with a base station in accordance with a distance from the base station. , A selection means for selecting one of a diversity handover and a frequency handover.

According to a second aspect of the present invention, there is provided a wireless communication apparatus.
In the wireless communication device according to the present invention, when communication quality deteriorates during the communication, the communication device has a determination unit that determines whether or not a distance to the base station is increased before and after the deterioration, and the selection unit is When the distance is greater than a certain value, the diversity handover is selected with priority, and when the distance is not more than a certain value, the frequency handover is selected with priority.

According to a third aspect of the present invention, there is provided a wireless communication apparatus.
The wireless communication device according to claim 1, wherein the determination unit detects a moving speed of the wireless communication device within a predetermined time before and after the deterioration, and performs the determination based on whether the moving speed is equal to or higher than a predetermined value. And

According to a fourth aspect of the present invention, there is provided a wireless communication apparatus.
3. The wireless communication device according to claim 1, wherein the moving speed is GPS.
Or a delay amount of transmission / reception in communication with the base station.

According to a fifth aspect of the present invention, there is provided a wireless communication apparatus.
In the wireless communication device according to the aspect, the determination unit detects a position of the wireless communication device when the deterioration occurs, and determines whether the distance to the base station calculated based on the position is equal to or greater than a predetermined value. The determination is performed.

According to a sixth aspect of the present invention, there is provided a wireless communication apparatus.
5. The wireless communication device according to claim 1, wherein the position is detected based on a result by GPS or a delay amount of transmission and reception in communication with the base station.

In order to achieve the above object, a wireless communication apparatus according to claim 7 performs communication with a base station, and when the communication quality is deteriorated, the wireless communication apparatus communicates with the base station before and after the deterioration. A wireless communication device that determines whether or not the distance has been opened, and based on the determination result, selects a handover to be performed, a moving speed detecting unit that detects a moving speed of the wireless communication device; Memory means for storing the moving speed, and judgment means for judging whether or not to execute the selected handover, or for making the base station judge.

In order to achieve the above object, a wireless communication apparatus according to claim 8 performs communication with a base station, and when the communication quality is deteriorated, the wireless communication apparatus communicates with the base station before and after the deterioration. A wireless communication device that determines whether or not the distance has been opened, and based on the determination result, selects a handover to be performed, a position detection unit that detects a position of the wireless communication device, and the detected position. Memory means for storing
A determination unit configured to determine whether to perform the selected handover or to cause the base station to determine.

In order to achieve the above object, a wireless communication apparatus according to a ninth aspect of the present invention is a wireless communication apparatus for communicating with a base station, wherein: It is characterized by having selection means for selecting either diversity handover or frequency handover.

According to another aspect of the present invention, there is provided a wireless communication apparatus for communicating with a base station, wherein diversity handover or frequency handover is performed according to the position of the wireless communication apparatus. And selecting means for selecting any one of the following.

In order to achieve the above object, a radio communication apparatus according to claim 11 is a radio communication apparatus for communicating with a mobile station, wherein a diversity handover or a frequency handover is performed according to a distance from the mobile station. And selecting means for selecting any one of the following.

According to a twelfth aspect of the present invention, in the wireless communication apparatus according to the eleventh aspect, when communication quality deteriorates during the communication, whether or not the distance to the mobile station has increased before and after the deterioration. Determining means, the selecting means, when the distance is opened more than a certain value, preferentially selects the diversity handover, when the distance did not open more than a certain value, the frequency The handover is preferentially selected.

According to a thirteenth aspect of the present invention, in the wireless communication apparatus according to the twelfth aspect, the determining means detects a moving speed of the mobile station within a fixed time before and after the deterioration, and detects the moving speed. Is determined based on whether or not is greater than or equal to a certain value.

According to a fourteenth aspect of the present invention, in the wireless communication apparatus according to the thirteenth aspect, the moving speed is G.
The detection is performed based on a result by the PS or a transmission / reception delay amount in communication with the mobile station.

According to a fifteenth aspect of the present invention, in the wireless communication apparatus according to the twelfth aspect, the determining means detects the position of the mobile station when the mobile station is deteriorated, and calculates the position based on the position. The determination is performed based on whether or not a distance from the mobile station is equal to or greater than a predetermined value.

A wireless communication device according to a sixteenth aspect is the wireless communication device according to the fifteenth aspect, wherein the location is a GPS.
Or a delay amount of transmission / reception in communication with the mobile station.

In order to achieve the above object, a wireless communication apparatus according to a seventeenth aspect communicates with a mobile station, and when the communication quality deteriorates, the wireless communication apparatus communicates with the mobile station before and after the deterioration. A wireless communication device that determines whether or not the distance has been opened, and based on the determination result, selects a handover to be performed, a moving speed detecting unit that detects a moving speed of the mobile station; It is characterized by having memory means for storing a moving speed, and judging means for judging whether or not to execute the selected handover or for making the mobile station judge.

In order to achieve the above object, a wireless communication apparatus according to claim 18 communicates with a mobile station, and when the communication quality is deteriorated, the wireless communication apparatus communicates with the mobile station before and after the deterioration. A wireless communication device that determines whether or not the distance has been opened, and based on the determination result, selects a handover to be performed, a position detecting unit that detects a position of the mobile station, and the detected position. It is characterized by having memory means for storing, and judgment means for judging whether or not to execute the selected handover, or for making the mobile station judge.

To achieve the above object, a wireless communication apparatus according to a nineteenth aspect is a wireless communication apparatus for communicating with a mobile station, wherein the wireless communication apparatus includes: It is characterized by having selection means for selecting either diversity handover or frequency handover.

According to another aspect of the present invention, there is provided a radio communication apparatus for communicating with a mobile station, wherein the radio communication apparatus performs diversity handover or frequency handover according to the position of the mobile station. It has a selection means for selecting either one.

To achieve the above object, a wireless communication method according to a twenty-first aspect is a wireless communication method for performing communication between a mobile station and a base station of a wireless communication apparatus, wherein the mobile station and the base station communicate with each other. A selection step of selecting either diversity handover or frequency handover according to the distance of

In a wireless communication method according to a twenty-second aspect, in the wireless communication method according to the twenty-first aspect, when the communication quality is degraded during the communication, it is determined whether or not the distance has opened before and after the degradation. A determining step, wherein the selecting step includes:
When the distance is greater than a certain value, the diversity handover is preferentially selected. When the distance is not more than a certain value, the frequency handover is preferentially selected.

A wireless communication method according to a twenty-third aspect of the present invention is the wireless communication method according to the twenty-second aspect, wherein the determining step detects a moving speed of the mobile station within a predetermined time before and after the deterioration, and determines the moving speed. Is determined based on whether or not is greater than or equal to a certain value.

[0034] In a wireless communication method according to a twenty-fourth aspect, in the wireless communication method according to the twenty-third aspect, the moving speed is G.
The detection is performed based on a result of PS or a delay amount of transmission and reception in communication between the mobile station and the base station.

A wireless communication method according to a twenty-fifth aspect is the wireless communication method according to the twenty-second aspect, wherein the determining step detects a position of the mobile station when the mobile station is deteriorated, and calculates the position based on the position. The determination is performed based on whether the distance is equal to or greater than a predetermined value.

A wireless communication method according to claim 26 is the wireless communication method according to claim 25, wherein the position is a GPS
Or a delay amount of transmission / reception in communication between the mobile station and the base station.

In order to achieve the above object, a wireless communication method according to claim 27 performs communication between a mobile station of a wireless communication apparatus and a base station, and when the communication quality is deteriorated, the deterioration of the communication quality is reduced. A wireless communication method for determining whether a distance between the mobile station and the base station has increased before and after, and selecting a handover to be performed based on the determination result, and detecting a moving speed of the mobile station. Moving speed detecting step, a memory step of storing the detected moving speed, and determining whether to execute the selected handover, or a determining step of causing the mobile station or the base station to determine It is characterized by having.

In order to achieve the above object, a wireless communication method according to claim 28 performs communication between a mobile station and a base station of a wireless communication apparatus. A wireless communication method for determining whether a distance between the mobile station and the base station has increased before and after, and selecting a handover to be performed based on the determination result, and detecting a position of the mobile station. A position detecting step, a memory step of storing the detected position, and a determining step of determining whether or not to execute the selected handover, or having the mobile station or the base station determine. It is characterized by.

To achieve the above object, a wireless communication method according to claim 29 is a wireless communication method for performing communication between a mobile station and a base station of a wireless communication apparatus, wherein the mobile station and the base station communicate with each other. Depending on the amount of transmission and reception delay in communication
The method includes a selection step of selecting one of a diversity handover and a frequency handover.

To achieve the above object, a wireless communication method according to claim 30 is a wireless communication method for performing communication between a mobile station and a base station of a wireless communication apparatus. , A selection step of selecting one of a diversity handover and a frequency handover.

In order to achieve the above object, a storage medium according to claim 31 is a readable storage medium storing a program for executing a communication method for performing communication between a mobile station and a base station of a wireless communication apparatus. Wherein the communication method includes a selection module for selecting one of a diversity handover and a frequency handover according to a distance between the mobile station and the base station.

A storage medium according to claim 32 is a storage medium according to claim 31.
The storage medium according to claim 1, further comprising a determination module configured to determine whether or not the distance has opened before and after the communication quality has deteriorated during the communication, wherein the selection module has the distance that is greater than or equal to a predetermined value. In this case, the diversity handover is preferentially selected, and when the distance does not open beyond a predetermined value, the frequency handover is preferentially selected.

The storage medium according to claim 33 is the storage medium according to claim 32.
The storage medium according to claim 1, wherein the determination module detects a moving speed of the mobile station within a predetermined time before and after the deterioration, and performs the determination based on whether the moving speed is equal to or higher than a predetermined value. .

The storage medium according to claim 34 is the storage medium according to claim 33.
In the storage medium described above, the moving speed is detected based on a result by GPS or a transmission / reception delay amount in communication between the mobile station and the base station.

The storage medium according to claim 35 is claim 32.
The storage medium according to claim 1, wherein the determination module detects a position of the mobile station when the mobile station is deteriorated, and performs the determination based on whether the distance calculated based on the position is equal to or greater than a predetermined value. And

The storage medium according to claim 36 is claim 35.
In the storage medium described above, the position is detected based on a result by GPS or a transmission / reception delay amount in communication between the mobile station and the base station.

To achieve the above object, the storage medium according to claim 37 performs communication between a mobile station of a wireless communication apparatus and a base station, and when the communication quality is deteriorated, before and after the deterioration. A readable storage medium storing a program for executing a communication method for selecting a handover to be executed based on a result of the determination as to whether or not the distance between the mobile station and the base station has been increased. A moving speed detecting module for detecting a moving speed of the mobile station, a memory module for storing the detected moving speed, and determining whether to execute the selected handover, or Alternatively, a judgment module for causing the base station to make a judgment is included.

To achieve the above object, a storage medium according to claim 38 performs communication between a mobile station of a radio communication apparatus and a base station, and when the communication quality is deteriorated, before and after the deterioration. A readable storage medium storing a program for executing a communication method for selecting a handover to be executed based on a result of the determination as to whether or not the distance between the mobile station and the base station has been increased. A position detection module for detecting the position of the mobile station, a memory module for storing the detected position, and determining whether to execute the selected handover, or the mobile station or the base station. A decision module for causing the station to make a decision.

In order to achieve the above object, a storage medium according to claim 39 is a readable storage medium storing a program for executing a communication method for performing communication between a mobile station and a base station of a wireless communication apparatus. Wherein the communication method includes a selection module that selects one of a diversity handover and a frequency handover according to a transmission / reception delay amount in communication between the mobile station and the base station.

A storage medium according to claim 40, wherein said storage medium stores a program for executing a communication method for performing communication between a mobile station and a base station of a wireless communication apparatus. Wherein the communication method includes a selection module for selecting one of a diversity handover and a frequency handover according to a distance between the mobile station and the base station.

In order to achieve the above object, a wireless communication apparatus according to claim 41 is a wireless communication apparatus for communicating with a base station, wherein diversity handover or frequency communication is performed in accordance with the moving speed of the wireless communication apparatus. It has a selection means for selecting one of the handovers.

In order to achieve the above object, a wireless communication method according to claim 42 is a wireless communication method for performing communication between a mobile station and a base station of a wireless communication apparatus, wherein the wireless communication method is based on a moving speed of the mobile station. And a selection step of selecting either diversity handover or frequency handover.

In order to achieve the above object, a storage medium according to claim 43 is a readable storage storing a program for executing a wireless communication method for performing communication between a mobile station and a base station of a wireless communication apparatus. A medium, wherein the communication method includes a selection module that selects one of a diversity handover and a frequency handover according to a moving speed of the mobile station.

[0054]

Embodiments of the present invention will be described below with reference to the drawings.

(First Embodiment) A wireless communication apparatus according to a first embodiment of the present invention will be described with reference to FIGS.

FIG. 1 is a block diagram showing a schematic configuration of a wireless communication apparatus according to the first embodiment of the present invention.
(A) shows a base station of the wireless communication device, and (b) shows a mobile station of the wireless communication device. The base station in FIG. 1A is the base station 501 in FIG. 5 described above, and the mobile stations in FIG. 1B are the mobile stations 502 to 504 in FIG. In the present embodiment, the mobile station 502 will be described as an example.

In FIG. 1A, a base station 501 mainly includes an RF unit 101 for performing transmission / reception processing of a radio link, a modulation / demodulation unit 102 for performing digital modulation / demodulation processing and the like, and a channel codec for codec-decoding data. It comprises a unit 103, a digital network interface unit 104 for connecting to a public or private digital network, and a base station control unit 105 (selecting means, discriminating means, judging means) for controlling these units in general.

In FIG. 1B, a mobile station 502 mainly includes an RF section 106 for performing transmission / reception processing of a radio link, a modulation / demodulation section 107 for performing digital modulation / demodulation processing and the like, and a channel codec for performing codec decoding of data. An input / output unit 109 for controlling a microphone / speaker / imaging unit / image monitor, a moving speed detecting unit 111 for detecting a moving speed of the mobile station 502, and storing the detected moving speed of the mobile station 502. Or, to determine whether to perform a handover according to the memory unit 110 that stores a control program described later, communication quality, moving speed, and the distance between the mobile station and the base station,
The mobile station control unit 112 (selection means, determination means,
Determination means).

In the present embodiment, when communication quality deteriorates during communication between base station 501 and mobile station 502, if the communication quality does not reach the predetermined communication quality even if the transmission power is increased, before and after the communication quality deterioration. It is determined whether or not the detected moving speed of the mobile station 502 is moving for a certain period of time, that is, whether or not the moving speed is equal to or higher than a threshold, and the mobile station 502 is not moving or the moving speed is lower than the threshold. In this case, the communication quality is improved by preferentially selecting the frequency handover, and the communication quality is improved by preferentially selecting the diversity handover when the moving speed is equal to or higher than the threshold value.

Next, an improvement process at the time of communication quality deterioration in the mobile station 502 will be described with reference to FIG.

FIG. 2 is a flowchart of a communication quality improvement process in the mobile station 502.

In FIG. 2, mobile station 502 is connected to base station 5
01, the communication quality is degraded during communication with the wireless communication device 01 and the communication quality is lower than the predetermined value but lower than the predetermined value (N in step S202).
O) and when the transmission power value is equal to or less than the threshold value (step S
At step S203, the transmission power value is increased (step S2).
04) Improve communication quality. On the other hand, step S203
As a result of the determination, if the transmission power value does not fall below the threshold value but exceeds the threshold value (NO in step S203), it is determined whether the moving speed of the mobile station 502 is equal to or higher than the threshold value within a predetermined time before and after the communication quality has deteriorated. (Step S20)
5). In the present embodiment, mobile station 502 and base station 501
Is determined based on the moving speed of the mobile station 502 based on the moving speed of the mobile station 502, and a measure is taken to improve communication quality according to the distance between the mobile station 502 and the base station 501. I do.

The moving speed of the mobile station 502 is represented by a GP (not shown).
It is detected (or calculated) based on S (Global Positioning Systems) or a transmission / reception time difference (delay amount) in communication with the communicating base station 501. The base station 501 selects a frequency handover or a diversity handover according to the detected (or calculated) moving speed.

As a result of the determination in step S205, the mobile station 5
When the moving speed of 02 is zero or less than the threshold value (NO in step S205), it is determined that the distance between the mobile station 502 and the base station 501 is not wide, a vacant frequency band is searched, and there is vacancy. If there is a frequency band (step S2
06, YES), a frequency handover is performed in this frequency band (step S208). As a result of performing the frequency handover, when the communication quality is equal to or higher than the predetermined value (YES in step S210), the handover is terminated.

On the other hand, as a result of the determination in step S210, when the communication quality is less than the predetermined value (N in step S210
O) Or, as a result of the determination in step S206, when there is no available frequency band and frequency handover cannot be performed (NO in step S206), it is determined whether there is a handover destination base station different from base station 501. It is determined (step S212). As a result of this determination, when there is another handover destination base station, diversity handover is performed (step S214). On the other hand, when there is no other handover destination base station (NO in step S212), the handover ends.

Also, as a result of the determination in step S205, when the moving speed of the mobile station 502 within a certain period of time is equal to or higher than the threshold value, it is highly likely that the communication quality has deteriorated because the distance to the base station 501 has increased. A search is made for a handover destination base station different from the base station 501 to determine whether there is a handover destination base station (step S207). If there is a handover destination base station, diversity handover is performed (step S207). S209). As a result of performing the diversity handover, if the communication quality is equal to or more than the predetermined value (YES in step S211), the handover is terminated.

If the result of the determination in step S211 indicates that the communication quality is less than the predetermined value (NO in step S211), or if the result of determination in step S207 is that there is no other handover destination base station than base station 501, A vacant frequency band is searched, and if there is a vacant frequency band (YES in step S213), a frequency handover is performed (step S215) to improve communication quality. (NO in step S213),
End the handover.

According to the first embodiment, the communication quality between the communicating mobile station 502 and the base station 501 deteriorates,
If the predetermined communication quality cannot be obtained even if the transmission power is increased within a possible range (NO in step S203), the moving speed of the mobile station 502 is detected before and after the communication quality during communication has deteriorated, and If the speed is less than the threshold (step S2
05, NO), frequency handover (step S20)
8) is preferentially selected, and if it is equal to or larger than the threshold (step S2)
05, YES), since diversity handover (step S209) is preferentially selected, handover means that can improve communication quality can be preferentially selected, and the time required for improving communication quality can be reduced. Can be.

(Second Embodiment) Next, a second embodiment of the present invention will be described.
The wireless communication device according to the embodiment will be described with reference to FIGS.

FIG. 3 is a block diagram showing a schematic configuration of a radio communication apparatus according to the second embodiment of the present invention.
(A) shows a base station of the wireless communication device, and (b) shows a mobile station of the wireless communication device. The base station in FIG. 3A is the base station 501 in FIG. 5 described above, and the mobile stations in FIG. 3B are the mobile stations 502 to 504 in FIG. In the present embodiment, the mobile station 502 will be described as an example.

In FIG. 3A, a base station 501 mainly includes an RF unit 301 for performing transmission / reception processing of a radio link, a modulation / demodulation unit 302 for performing digital modulation / demodulation processing and the like, and a channel codec for codec-decoding data. It comprises a unit 303, a digital network interface unit 304 for connecting to a public or private digital network, and a base station control unit 305 (selecting means, discriminating means, judging means) for controlling these units in general.

In FIG. 3B, a mobile station 502 mainly includes an RF unit 306 for performing transmission / reception processing of a radio link, a modulation / demodulation unit 307 for performing digital modulation / demodulation processing, etc. Unit 308, an input / output unit 309 for controlling a microphone, a speaker, an imaging unit, an image monitor, and the like; a position detection unit 311 for detecting the position (own position) of the mobile station 502; And a memory unit 310 for storing a control program to be described later, and determining whether to perform a handover according to communication quality, a moving speed, a position of a mobile station, and the like.
The mobile station control unit 312 (selection means, determination means, determination means) which asks the base station for a determination and controls the whole of the mobile station 502.

In the present embodiment, when communication quality deteriorates during communication of base station 501 with mobile station 502, when the communication quality does not reach a predetermined communication quality even if the transmission power is increased, when communication quality deteriorates, Based on the detected location of the mobile station 502,
When the distance between the mobile station 502 and the base station 501 is less than the threshold, priority is given to frequency handover to improve communication quality, and when the distance is greater than the threshold, diversity handover is preferentially selected. To improve communication quality.

Next, the improvement processing at the time of communication quality deterioration in the mobile station 502 will be described with reference to FIG.

FIG. 4 is a flowchart of a communication quality improvement process in the mobile station 502.

In FIG. 4, mobile station 502 is connected to base station 5
01, the communication quality is degraded during communication with the wireless communication device 01 and the communication quality is not higher than the predetermined value but lower than the predetermined value (N in step S402)
O) and when the transmission power value is equal to or less than the threshold value (step S
YES at 403), the transmission power value is increased (step S4).
04) Improve communication quality. On the other hand, step S403
As a result of the determination, if the transmission power value does not fall below the threshold but exceeds the threshold (NO in step S403), it is determined whether the distance between the mobile station 502 and the base station 501 when the communication quality during communication has deteriorated is greater than or equal to the threshold. (Step S40)
5). In the present embodiment, mobile station 502 and base station 501
Is determined based on the position of the mobile station 501, and whether or not a measure to improve communication quality is selected according to the distance between the mobile station 502 and the base station 501. .

The position of the mobile station 502 is detected (or calculated) based on a time difference (delay amount) of transmission and reception in communication with a not-shown GPS or a communicating base station 501. The base station 501 selects frequency handover or diversity handover according to the distance between the mobile station 502 and the base station 501 based on the position of the mobile station 502.

As a result of the determination in step S405, the mobile station 5
If the distance between the base station 02 and the base station 501 is not equal to or larger than the threshold and is smaller than the threshold (NO in step S405), it is determined that the distance to the base station 501 is not wide, a vacant frequency band is searched, and there is a vacancy. If there is a frequency band (step S4
If YES in step 06, a frequency handover is performed in this frequency band (step S408). As a result of performing the frequency handover, when the communication quality is equal to or more than the predetermined value (YES in step S410), the handover is terminated.

On the other hand, as a result of the determination in step S410, when the communication quality is less than the predetermined value (N in step S410)
O) Or, as a result of the determination in step S406, if there is no available frequency band and frequency handover cannot be performed (NO in step S406), it is determined whether or not there is a handover destination base station different from the base station 501. It is determined (step S412). As a result of this determination, if there is another handover destination base station, diversity handover is performed (step S414), while if there is no other handover destination base station (NO in step S412), the handover is terminated.

If the distance between the mobile station 502 and the base station 501 is equal to or greater than the threshold value as a result of the determination in step S405, the communication quality may have deteriorated because the distance between the mobile station 502 and the base station 501 is large. Since it is high, a handover destination base station different from the base station 501 is searched to determine whether there is a handover destination base station (step S407). If there is another handover destination base station, diversity handover is performed. Is performed (step S409). As a result of performing the diversity handover, if the communication quality is equal to or more than the predetermined value (YES in step S411), the handover is completed.

If the result of the determination in step S 411 is that the communication quality is less than the predetermined value (NO in step S 411), or if the result of the determination in step S 407 is that there is no other handover destination base station than base station 501, A vacant frequency band is searched, and if there is a vacant frequency band (YES in step S413), a frequency handover is performed (step S415) to improve communication quality, while if there is no vacant frequency band, (NO in step S413),
End the handover.

According to the second embodiment, the communication quality between the communicating mobile station 502 and base station 501 deteriorates,
If the predetermined communication quality cannot be obtained even if the transmission power is increased within a possible range (NO in step S403), the position of the mobile station 502 when the communication quality during communication is deteriorated is detected, and the mobile station 502 is detected. If the distance between the mobile station and the base station 501 is smaller than the threshold (NO in step S405), the frequency handover (step S408) is preferentially selected. If the distance is larger than the threshold (YES in step S405), the diversity handover (step S409) is performed. Since priority is given to selection, handover means that can improve communication quality can be selected with priority, and the time required to improve communication quality can be reduced.

In the first and second embodiments, the distance between the mobile station and the base station is determined based on the moving speed of the mobile station before and after the communication quality is deteriorated or the position of the mobile station when the communication quality is deteriorated. Although it has been determined whether or not it has been opened, the determination may alternatively be made according to the amount of transmission and reception delay in communication with the base station.

In the first and second embodiments,
The memory units 110 and 310, the moving speed detecting unit 111, and the position detecting unit 311 are provided on the mobile station side to detect the moving speed, the position, and the like of the mobile station. The moving speed, the position, and the like of the mobile station may be detected, and the above-described communication quality improvement processing may be performed. In addition, although it is the mobile station that selects either the diversity handover or the frequency handover, the selection may be performed by the base station.

A program for executing the control method for realizing the first and second embodiments stored in the memory units 110 and 310 is stored in an arbitrary removable storage medium, and the storage medium is externally mounted. By doing so, the program may be supplied to the mobile station controller or the base station controller and executed. As a storage medium for supplying this program, for example, a floppy (registered trademark) disk, hard disk, optical disk, magneto-optical disk,
There are a CD-ROM, a CD-R, a magnetic tape, a nonvolatile memory card, and the like.

[0086]

As described in detail above, claim 1
According to the apparatus described in Item 11 and the method described in Claim 21, one of the diversity handover and the frequency handover is selected according to the distance between the base station and the mobile station of the wireless communication apparatus, so that the communication quality can be improved. Such a handover can be selected first, and the time until the communication quality is improved can be reduced.

An apparatus according to claims 2 and 12, and an apparatus according to claim 22
According to the described method, when communication quality deteriorates during communication, it is determined whether or not the distance between the mobile station and the base station has increased before and after the deterioration, and when the distance has exceeded a certain value, Diversity handover is preferentially selected, and when the distance does not open beyond a certain value, frequency handover is preferentially selected, so that handover that can improve communication quality can be preferentially selected, and communication quality can be selected. Can be shortened.

An apparatus according to claims 3 and 13 and an apparatus according to claim 23
According to the described method, the moving speed of the mobile station is detected within a certain time period before and after the deterioration, and the determination is made based on whether the moving speed is equal to or higher than a certain value. Can be accurately grasped whether or not the distance between them has increased.

An apparatus according to claims 4 and 14, and an apparatus according to claim 24.
According to the described method, the moving speed is detected based on the result by the GPS or the amount of transmission / reception delay in the communication between the mobile station and the base station, so that the moving speed of the mobile station can be detected more accurately. it can.

An apparatus according to claims 5 and 15 and claim 25.
According to the described method, the position of the mobile station when deteriorated is detected, and the determination is made based on whether or not the distance between the base station and the mobile station calculated based on the position is equal to or greater than a predetermined value. It is possible to accurately grasp whether or not the distance between the mobile station as a device and the base station has increased.

An apparatus according to claims 6 and 16 and claim 26.
According to the described method, the position is detected based on the result of the GPS or the amount of transmission / reception delay in communication between the base station and the mobile station, so that the position of the mobile station can be detected more accurately.

An apparatus according to claims 7 and 17 and claim 27.
According to the described method, the moving speed of the mobile station is detected, the detected moving speed is stored, and it is determined whether or not to execute the selected handover, or the mobile station or the base station makes the determination. In addition, a handover that can improve communication quality can be selected first, and the time required to improve communication quality can be reduced.

An apparatus according to claims 8 and 18 and claim 28.
According to the described method, the position of the mobile station is detected, the detected position is stored, and it is determined whether or not to execute the selected handover, or the mobile station or the base station is made to make a determination. The handover that can improve the quality can be selected first, and the time until the communication quality is improved can be reduced.

An apparatus according to claims 9 and 19 and an apparatus according to claim 29
According to the described method, either one of the diversity handover or the frequency handover is selected according to the transmission / reception delay amount in the communication between the mobile station and the base station. The same effect as the described method can be obtained.

Apparatus according to claims 10 and 20, and claim 3
According to the method described in Item No. 0, one of the diversity handover and the frequency handover is selected according to the position of the mobile station. Therefore, the same effects as those of the apparatus described in Claims 1 and 11 and the method described in Claim 21 are obtained. Can play.

According to the storage medium of claim 31, one of the diversity handover and the frequency handover is selected according to the distance between the mobile station and the base station, so that the handover that can improve the communication quality is performed first. , And the time until the communication quality is improved can be shortened.

According to the apparatus of claim 41, since either the diversity handover or the frequency handover is selected according to the moving speed of the radio communication apparatus, the handover that can improve the communication quality is selected first. And the time until the communication quality is improved can be shortened.

According to the method described in claim 42 and the storage medium described in claim 43, one of the diversity handover and the frequency handover is selected according to the moving speed of the mobile station, so that the communication quality can be improved. Handover can be selected first, and the time required to improve communication quality can be reduced.

[Brief description of the drawings]

FIG. 1 is a block diagram showing a schematic configuration of a wireless communication device according to a first embodiment of the present invention, wherein (a) shows a base station of the wireless communication device, and (b) shows a mobile station of the wireless communication device. Show.

FIG. 2 is a flowchart of a communication quality improvement process in a mobile station 502.

FIG. 3 is a block diagram illustrating a schematic configuration of a wireless communication device according to a second embodiment of the present invention, wherein (a) illustrates a base station of the wireless communication device, and (b) illustrates a mobile station of the wireless communication device. Show.

FIG. 4 is a flowchart of communication quality improvement processing in a mobile station 502.

FIG. 5 is an explanatory diagram of an overall configuration of a mobile communication system.

FIG. 6 is a block diagram showing a schematic configuration of a wireless communication device in a conventional mobile communication system, wherein (a) shows a base station of the wireless communication device, and (b) shows a mobile station of the wireless communication device.

[Explanation of symbols]

 110, 310 Memory unit 111 Moving speed detection unit 112, 312 Mobile station control unit 311 Position detection unit 501 Base station 502 Mobile communication telephone 503 Mobile communication videophone 504 Mobile communication information terminal

Claims (43)

[Claims] 1. A wireless communication apparatus for communicating with a base station, comprising a selection unit for selecting one of a diversity handover and a frequency handover according to a distance from the base station. Wireless communication device. 2. When the communication quality deteriorates during the communication, the communication unit has a determination unit configured to determine whether a distance from the base station has increased before and after the deterioration. If it opens beyond a certain value,
The wireless communication apparatus according to claim 1, wherein the diversity handover is selected with priority, and when the distance does not open beyond a certain value, the frequency handover is selected with priority. 3. The method according to claim 1, wherein the determining unit detects a moving speed of the wireless communication apparatus within a predetermined time before and after the deterioration,
3. The wireless communication apparatus according to claim 2, wherein the determination is made based on whether the moving speed is equal to or higher than a predetermined value. 4. The wireless communication apparatus according to claim 3, wherein the moving speed is detected based on a result of a GPS or a transmission / reception delay amount in communication with the base station. 5. The determination means detects a position of the wireless communication device when the wireless communication device is deteriorated, and determines the determination based on whether a distance to the base station calculated based on the position is equal to or greater than a predetermined value. The wireless communication device according to claim 2, wherein the wireless communication is performed. 6. The wireless communication apparatus according to claim 5, wherein the position is detected based on a result of a GPS or a transmission / reception delay amount in communication with the base station. 7. Communication is performed with a base station, and when the communication quality is degraded, it is determined whether or not the distance to the base station has increased before and after the degradation, and based on the determination result. A wireless communication device that selects a handover to be performed, a moving speed detecting unit that detects a moving speed of the wireless communication device; a memory unit that stores the detected moving speed; A wireless communication apparatus comprising: a determination unit configured to determine whether to perform the determination or to cause the base station to determine. 8. Communication is performed with a base station, and when the communication quality is degraded, it is determined whether or not the distance to the base station has increased before and after the degradation, and based on the determination result. A wireless communication device that selects a handover to be performed, a position detection unit that detects a position of the wireless communication device, a memory unit that stores the detected position, and whether to execute the selected handover. A wireless communication apparatus comprising: a determination unit configured to determine whether or not the base station determines whether the wireless communication is performed. 9. A radio communication apparatus for communicating with a base station, comprising a selection means for selecting either diversity handover or frequency handover in accordance with the amount of transmission / reception delay in communication with the base station. A wireless communication device characterized by the above-mentioned. 10. A radio communication apparatus for communicating with a base station, comprising a selection means for selecting either diversity handover or frequency handover according to the position of the radio communication apparatus. Wireless communication device. 11. A radio communication apparatus for communicating with a mobile station, characterized in that the radio communication apparatus has a selection means for selecting one of a diversity handover and a frequency handover in accordance with a distance from the mobile station. Wireless communication device. 12. When the communication quality is deteriorated during the communication, the communication unit has a determination unit that determines whether or not the distance to the mobile station is large before and after the deterioration. If it opens beyond a certain value,
The wireless communication apparatus according to claim 11, wherein the diversity handover is selected with priority, and when the distance does not open beyond a certain value, the frequency handover is selected with priority. 13. The method according to claim 12, wherein the determining means detects a moving speed of the mobile station within a predetermined time before and after the deterioration, and performs the determination based on whether the moving speed is equal to or more than a predetermined value. Item 13. The wireless communication device according to item 12. 14. The wireless communication apparatus according to claim 13, wherein the moving speed is detected based on a result of a GPS or a transmission / reception delay amount in communication with the mobile station. 15. The determination unit detects a position of the mobile station when the mobile station is deteriorated, and performs the determination based on whether or not a distance to the mobile station calculated based on the position is equal to or greater than a predetermined value. The wireless communication device according to claim 12, wherein: 16. The wireless communication apparatus according to claim 15, wherein the position is detected based on a result of a GPS or a transmission / reception delay amount in communication with the mobile station. 17. Communication with a mobile station is performed, and when the communication quality is deteriorated, it is determined whether or not the distance to the mobile station is increased before and after the deterioration, and based on the determination result. A mobile communication device that selects a handover to be performed, a moving speed detecting unit that detects a moving speed of the mobile station, a memory unit that stores the detected moving speed, and executes the selected handover. A wireless communication apparatus comprising: a determination unit configured to determine whether or not to perform, or to allow the mobile station to determine. 18. Communication with a mobile station, and when the communication quality is degraded, it is determined whether or not the distance to the mobile station has increased before and after the degradation, and based on the determination result. A wireless communication device that selects a handover to be performed, a position detecting unit that detects a position of the mobile station, a memory unit that stores the detected position, and whether to execute the selected handover. And a determination unit for determining whether the mobile station is in the mobile station. 19. A radio communication apparatus for communicating with a mobile station, comprising a selection means for selecting one of a diversity handover and a frequency handover in accordance with a transmission / reception delay amount in communication with the mobile station. A wireless communication device characterized by the above-mentioned. 20. A radio communication apparatus for communicating with a mobile station, comprising a selection unit for selecting one of a diversity handover and a frequency handover according to a position of the mobile station. Communication device. 21. A wireless communication method for performing communication between a mobile station and a base station of a wireless communication apparatus, wherein one of a diversity handover and a frequency handover is performed according to a distance between the mobile station and the base station. A wireless communication method comprising a selecting step of selecting. 22. When the communication quality deteriorates during the communication, the communication method further includes a determining step of determining whether the distance has opened before and after the deterioration. The selecting step includes the step of opening the distance by a predetermined value or more. When
22. The wireless communication method according to claim 21, wherein the diversity handover is selected with priority, and when the distance does not open beyond a certain value, the frequency handover is selected with priority. 23. The method according to claim 23, wherein the determining step detects a moving speed of the mobile station within a predetermined time before and after the deterioration, and performs the determination based on whether the moving speed is equal to or higher than a predetermined value. Item 23. The wireless communication method according to item 22. 24. The mobile station according to claim 23, wherein the moving speed is detected based on a result of a GPS or a transmission / reception delay amount in communication between the mobile station and the base station.
The wireless communication method as described. 25. The determining step detects a position of the mobile station when the mobile station is deteriorated, and performs the determination based on whether or not the distance calculated based on the position is equal to or greater than a predetermined value. 23. The wireless communication method according to claim 22, wherein: 26. The wireless communication method according to claim 25, wherein the position is detected based on a result of a GPS or a transmission / reception delay amount in communication between the mobile station and the base station. 27. Communication between a mobile station and a base station of a wireless communication apparatus, and when the communication quality is deteriorated, whether or not the distance between the mobile station and the base station is increased before and after the deterioration. A moving speed detecting step of detecting a moving speed of the mobile station, wherein the moving speed detecting step detects a moving speed of the mobile station, and storing the detected moving speed. A wireless communication method comprising: a memory step; and a step of determining whether to execute the selected handover, or a step of causing the mobile station or the base station to determine. 28. Communication between a mobile station and a base station of a wireless communication apparatus, and when the communication quality is deteriorated, whether or not the distance between the mobile station and the base station is increased before and after the deterioration. A radio communication method for selecting a handover to be executed based on the result of the determination, a position detecting step of detecting a position of the mobile station, and a memory step of storing the detected position. Determining whether to execute the selected handover or causing the mobile station or the base station to make a determination. 29. A wireless communication method for performing communication between a mobile station and a base station of a wireless communication apparatus, wherein diversity handover or frequency handover is performed according to a transmission / reception delay in communication between the mobile station and the base station. Wireless communication method, comprising a selecting step of selecting any one of the following. 30. A wireless communication method for performing communication between a mobile station and a base station of a wireless communication apparatus, wherein a selecting step of selecting one of a diversity handover and a frequency handover according to a position of the mobile station. A wireless communication method comprising: 31. A readable storage medium storing a program for executing a communication method for performing communication between a mobile station and a base station of a wireless communication apparatus, wherein the communication method includes the mobile station and the base station. A storage medium comprising: a selection module that selects one of a diversity handover and a frequency handover according to a distance to a station. 32. When the communication quality deteriorates during the communication, the communication module includes a determination module that determines whether or not the distance has opened before and after the deterioration, wherein the selection module has opened the distance by a predetermined value or more. 32. The storage medium according to claim 31, wherein the priority is given to the diversity handover, and if the distance does not open beyond a predetermined value, the frequency handover is given priority. 33. The method as claimed in claim 33, wherein the determining module detects a moving speed of the mobile station within a fixed time before and after the deterioration, and performs the determination based on whether the moving speed is equal to or more than a fixed value. Item 33. The storage medium according to Item 32. 34. The mobile terminal according to claim 33, wherein the moving speed is detected based on a result of a GPS or a transmission / reception delay amount in communication between the mobile station and the base station.
The storage medium according to the above. 35. The discrimination module detects a position of the mobile station when the mobile station is deteriorated, and performs the determination based on whether or not the distance calculated based on the position is equal to or greater than a predetermined value. 33. The storage medium according to claim 32. 36. The storage medium according to claim 35, wherein the position is detected based on a result of a GPS or a transmission / reception delay amount in communication between the mobile station and the base station. 37. Communication between a mobile station and a base station of a wireless communication apparatus, and when the communication quality is deteriorated, whether the distance between the mobile station and the base station is increased before and after the deterioration. A readable storage medium storing a program for executing a wireless communication method for selecting a handover to be executed based on a result of the judgment, and a moving speed detection for detecting a moving speed of the mobile station. Module, a memory module for storing the detected moving speed, and a determining module for determining whether to execute the selected handover, or for allowing the mobile station or the base station to determine. Characteristic storage medium. 38. Communication between a mobile station of a wireless communication apparatus and a base station, and when the communication quality is deteriorated, whether or not the distance between the mobile station and the base station is increased before and after the deterioration. A readable storage medium storing a program for executing a wireless communication method for selecting a handover to be performed based on the determination result, and a position detection module for detecting a position of the mobile station; A memory module that stores the detected position; and a determination module that determines whether to execute the selected handover, or that causes the mobile station or the base station to determine. Storage medium. 39. A readable storage medium storing a program for executing a wireless communication method of performing communication between a mobile station and a base station of a wireless communication apparatus, wherein the communication method includes the mobile station and the base station. A storage medium comprising: a selection module that selects one of a diversity handover and a frequency handover according to a transmission / reception delay amount in communication with a base station. 40. A readable storage medium storing a program for executing a wireless communication method for performing communication between a mobile station and a base station of a wireless communication apparatus, wherein the communication method includes: A storage medium, comprising: a selection module that selects one of a diversity handover and a frequency handover according to 41. A radio communication apparatus for communicating with a base station, comprising a selection means for selecting one of a diversity handover and a frequency handover according to a moving speed of the radio communication apparatus. Wireless communication device. 42. A radio communication method for performing communication between a mobile station and a base station of a radio communication apparatus, wherein a selecting step of selecting one of a diversity handover and a frequency handover according to a moving speed of the mobile station. A wireless communication method comprising: 43. A readable storage medium storing a program for executing a wireless communication method for performing communication between a mobile station and a base station of a wireless communication apparatus, wherein the communication method includes the step of moving the mobile station. A storage medium comprising a selection module for selecting one of a diversity handover and a frequency handover according to a speed.