JP4625850B2 - Wireless communication system, base station, mobile station, and wireless communication method - Google Patents

Description

  The present invention relates to a wireless communication system, a base station, a mobile station, and a wireless communication method capable of wireless communication.

  In recent years, wireless terminals such as PHS (Personal Handy phone System) and mobile phones have become widespread, and there has been a demand for improvement in communication quality and communication rate as well as downsizing and weight reduction of wireless terminals. For example, adaptive modulation is being adopted in which a modulation scheme is adaptively changed and communication rate is improved according to a change in communication environment while maintaining communication quality.

  Such adaptive modulation is a communication between the mobile station and the base station based on the signal to interference and noise ratio (SINR) or bit error rate of uplink transmission data transmitted from the mobile station to the base station. Estimate the environment, select a modulation method with a higher communication rate under a better communication environment, select a modulation method with a lower communication rate under a poor communication environment, and implement stable wireless communication It is a method.

For example, in Patent Document 1, the control means of the base station determines the quality of the uplink signal, and the signal transmitted on the downlink is modulated based on the information related to the quality.
Special Table 2000-513899

  However, in the above-described technique using adaptive modulation, since the base station determines the modulation scheme based on the signal quality with the mobile station, there is no means for controlling the modulation scheme on the mobile station side, The communication state desired by the user could not be reflected.

  Similarly, transmission methods such as CDMA (Code Division Multiple Access) and TDMA (Time Division Multiple Access) are also unilaterally determined by the base station, and how much resources are available and Whether the handover is executed when the electric field strength is deteriorated to some extent is an agreement of the wireless communication system itself, and the user cannot change the communication state.

  However, here, if the user can freely select the transmission method and modulation method, not only the change request exceeding the allowable range of the base station is rushed, but the overall control balance of the wireless communication system is disrupted, Then, stable communications can become unstable.

  In view of such problems, the present invention can easily realize a communication state desired by a user with only a simple configuration such as selection of priority items without breaking the overall balance of the wireless communication system. An object of the present invention is to provide a radio communication system, a base station, a mobile station, and a radio communication method.

In order to solve the above-described problems, a typical configuration of the present invention is a wireless communication system including a plurality of base stations and a mobile station capable of wireless communication with the base station, and the base station transmits a compatible transmission. An information transmitter that transmits one or more base station information selected from a group of systems, applicable modulation systems, resource availability information, and position information to the mobile station, and receives a communication state change request from the mobile station A request receiving unit that performs communication with the mobile station according to the communication state indicated in the change request, the mobile station receiving an information receiving unit that receives base station information from the base station, and a user setting Or a priority item selection unit that selects either a priority item of communication quality priority or connectivity priority according to changes in the communication environment, and communication necessary to achieve the priority item selected based on the base station information State derivation to derive the state And parts, and change request transmission unit that transmits to the base station the difference between the actual communication state between the derived communication with the base station as a change request, decomposing the voice from the other party to the morphemes extracted, the wording And a voice analysis unit that analyzes the meaning of the priority item selection unit, when the text indicates the meaning that the call is difficult, the priority item selection unit selects the communication quality priority . Here, the communication state indicates a transmission method, a modulation method, a base station that has established wireless communication, and the like of the wireless communication being executed.

With this configuration, users can easily select whether communication quality (sound quality for calls, transmission speed for data communications) or connectivity is prioritized, and important calls and large volumes of data from customers can be quickly received. Therefore, it is possible to easily realize a desired communication state according to the situation at that time, for example, because it is necessary to receive the data or because the movement speed is high and it is desired to ensure connectivity. In addition, since base station information is collected from a plurality of base stations in advance in the present invention, it is possible to receive the maximum allowable communication quality or connectivity of the base station without destroying the overall balance of the radio communication system. It becomes.
In particular, the mobile station detects that it is difficult to communicate by selecting the communication quality priority when the speech from the other party is decomposed and extracted into morphemes and the analyzed wording indicates that it is difficult to communicate. Thus, communication quality priority, that is, sound quality priority can be automatically set. Therefore, it is possible to perform wireless communication with a desired communication quality for the other party.

  When the base station information includes a compatible transmission method, the state deriving unit derives a short-distance transmission method when communication quality priority is selected, and a long distance when connectivity priority is selected. A transmission system for distance may be derived. With such a configuration, when a user wants to prioritize a transmission scheme desired, for example, communication quality, a short-distance transmission scheme such as TDMA, and when priority is given to connectivity, wireless communication can be performed using a long-distance transmission scheme such as CDMA. It becomes possible.

  When base station information includes applicable modulation schemes, the state deriving unit derives the modulation scheme with the highest transmission rate when communication quality priority is selected, and when connectivity priority is selected. A modulation scheme with the lowest transmission rate may be derived. With this configuration, when a modulation scheme desired by the user, for example, communication quality is given priority, 256QAM (Quadrature Amplitude Modulation), 64QAM, 16QAM, QPSK (Quadrature Phase Shift Keying), BPSK (Binary PSK) within the allowable range of the base station When it is desired to prioritize connectivity with the higher-order modulation scheme, wireless communication can be performed with the lower-order modulation scheme.

  When the resource availability information is included in the base station information and communication quality priority is selected, the state derivation unit compares the resource availability information of a plurality of base stations, and performs handover to the base station with the most available resources. Execution may be derived. By forcibly handing over to a base station with many free resources in this way, the user can perform wireless communication with a desired communication quality.

  When position information is included in base station information and communication quality priority is selected, the state deriving unit performs three-point positioning based on position information of a plurality of base stations and GPS signals or radio signals from the plurality of base stations. The execution of the handover to the closest base station may be derived based on the location information of the mobile station based on the above. By forcibly handing over to a short-distance base station in this way, the user can perform wireless communication with desired communication quality.

  The mobile station may further include a voice input unit that acquires voice, and when the voice noise level exceeds a predetermined noise level, the priority item selection unit may select communication quality priority. Such a configuration of the voice input unit makes it possible to detect a change in the communication environment, particularly a change in noise level. When a predetermined noise level is exceeded, priority is given to communication quality, that is, priority is given to sound quality. It is possible to perform wireless communication according to.

  The mobile station may further include a speed deriving unit that derives its own moving speed, and when the moving speed exceeds a predetermined speed, the priority item selecting unit may select connectivity priority. The moving speed is derived from the position of the base station and the number of handovers in the speedometer, accelerometer, and handover. With this configuration, the user can perform wireless communication with the desired connectivity, regardless of changes in the moving speed, in particular, an increase in moving speed.

  The mobile station further includes an interference wave detection unit that detects an interference wave in the current communication channel, and when the interference wave is detected, the priority item selection unit can also select connectivity priority. By giving priority to connectivity in this way, interference waves can be avoided, and the user can perform wireless communication with the desired connectivity.

  The mobile station further includes a partner information acquisition request unit that requests acquisition of a transmission method or modulation method with which the mobile station of the communication partner communicates, and the state derivation unit transmits the transmission method acquired in response to the request for acquiring the modulation method. Alternatively, a modulation scheme may be derived. When the transmission method or modulation method of each mobile station is different, one of them becomes a bottleneck and obstructs comfortable wireless communication. In the present invention, it is possible to perform optimum wireless communication without under and over specs by combining the transmission method or modulation method with the mobile station of the communication partner.

  The mobile station further includes a priority item acquisition request unit that requests acquisition of the priority item selected in the mobile station of the communication counterpart, and the state derivation unit achieves the priority item acquired in response to the priority item acquisition request Therefore, a communication state necessary for the purpose may be derived. In the present invention, priority items can be matched with the mobile station of the communication partner, and communication quality or connectivity is prioritized in both, and optimal wireless communication can be performed.

  The mobile station further includes a wired determination unit that determines whether or not the communication partner is connected to the communication network by wire, and when it is determined that the communication partner is wired, the state deriving unit may derive a wired communication band . The communication band (dynamic range) in the wired connection is, for example, 32 kHz, and it is possible to perform the optimum wireless communication without under and over specs by adjusting the wireless communication to the communication band.

Another representative configuration according to the present invention is a mobile station capable of wireless communication with a base station, and is selected from the group of a compatible transmission method, a compatible modulation method, resource availability information, and position information. Or an information receiving unit that receives two or more base station information from the base station, and a priority item selection unit that selects either a priority item of communication quality priority or connectivity priority according to a change in user settings or communication environment, Based on the base station information, a state deriving unit for deriving a communication state necessary for achieving the selected priority item, and a difference between the derived communication state and the actual communication state of the base station as a change request A change request transmission unit that transmits to the base station, and a voice analysis unit that decomposes and extracts speech from the other party into morphemes and analyzes the meaning of the wording, indicating that the wording is difficult to call Select priority item It is characterized by selecting the communication quality preferentially.

Another representative configuration according to the present invention is a wireless communication method using a plurality of base stations and a mobile station capable of wireless communication with the base station. 1 or two or more base station information selected from a group of modulation schemes, resource availability information, and position information is transmitted to the mobile station, and the mobile station receives the base station information from the base station, and performs user setting or communication environment. The priority item of communication quality priority or connectivity priority is selected according to the change of the voice, the voice from the other party is decomposed and extracted into morphemes, the meaning of the word is analyzed, and the word is difficult to call. When indicating a certain meaning, the priority item selection unit selects communication quality priority , derives a communication state necessary to achieve the selected priority item based on the base station information, and derives a communication state derived And the difference between the actual communication status between the base station Further transmitted to the base station as a request, the base station receives the change request from the mobile station, and executes a communication with a mobile station by the communication state shown in the change request.

  The components corresponding to the technical idea in the wireless communication system described above and the description thereof can be applied to the base station, the mobile station, and the wireless communication method.

  As described above, the present invention can easily realize a communication state desired by a user with only a simple configuration such as selection of priority items without breaking the overall balance of the wireless communication system.

  Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. The dimensions, materials, and other specific numerical values shown in the embodiment are merely examples for facilitating understanding of the invention, and do not limit the present invention unless otherwise specified. In the present specification and drawings, elements having substantially the same function and configuration are denoted by the same reference numerals, and redundant description is omitted, and elements not directly related to the present invention are not illustrated. To do.

  A mobile station represented by a PHS terminal, a mobile phone, or the like constructs a wireless communication system that performs wireless communication with a base station that is fixedly arranged at a predetermined interval. Here, in order to facilitate understanding, the entire wireless communication system will be described, and then specific configurations of a PHS terminal and a base station as mobile stations will be described. In addition, although a PHS terminal is cited here as a mobile station, the present invention is not limited to this, but a mobile phone, a notebook personal computer, a PDA (Personal Digital Assistant), a digital camera, a music player, a car navigation system, a portable TV, a game Various electronic devices capable of wireless communication, such as devices, DVD players, and remote controllers, can also be used as mobile stations.

(Wireless communication system 100)
FIG. 1 is an explanatory diagram showing a schematic connection relationship of the wireless communication system 100. The wireless communication system 100 includes a PHS terminal 110 (110A, 110B), a base station 120 (120A, 120B, 120C), an ISDN (Integrated Services Digital Network) line, the Internet, a dedicated line, and the like. And the relay server 140.

  In the wireless communication system 100, when a user connects a communication line from his / her PHS terminal 110A to another PHS terminal 110B, the PHS terminal 110A makes a wireless connection request to the base station 120A within the communicable range. . The base station 120A that has received the wireless connection request requests the relay server 140 to establish a communication connection with the communication partner via the communication network 130. The relay server 140 refers to the location registration information of the other PHS terminal 110B, and so on. The base station 120B within the wireless communication range of the PHS terminal 110B is selected to secure a communication path between the base station 120A and the base station 120B, and communication between the PHS terminal 110A and the PHS terminal 110B is established.

  Here, when the PHS terminal 110B as the communication partner moves, the distance between the PHS terminal 110B and the base station 120B increases, and finally, wireless communication with the base station 120B becomes difficult. The PHS terminal 110B predicts that wireless communication becomes difficult due to the attenuation of the electric field strength of the signal from the base station 120B, performs carrier sense again, and performs wireless communication with the base station 120C having high electric field strength. To request. When the base station 120B notifies the relay server 140 to that effect, the relay server 140 performs a handover from the base station 120B to the base station 120C.

  Also, in such a wireless communication system 100, adaptive modulation is performed to improve the communication rate by changing the modulation method adaptively according to changes in the communication environment while maintaining the communication quality between the PHS terminal 110 and the base station 120. Can be used.

(PHS terminal 110)
FIG. 2 is a functional block diagram showing a hardware configuration of the PHS terminal 110, and FIG. 3 is a perspective view showing an appearance of the PHS terminal 110. As shown in FIG. The PHS terminal 110 includes a terminal control unit 210, a terminal memory 212, a display unit 214, an operation unit 216, a voice input unit 218, a voice output unit 220, and a terminal wireless communication unit 222. .

  The terminal control unit 210 manages and controls the entire PHS terminal 110 using a semiconductor integrated circuit including a central processing unit (CPU). In addition, the terminal control unit 210 performs a call function, a mail transmission / reception function, an imaging function, a music playback function, and a TV viewing function using the program in the terminal memory 212. The terminal memory 212 includes a ROM, RAM, EEPROM, nonvolatile RAM, flash memory, HDD (Hard Disk Drive), and the like, and stores programs processed by the terminal control unit 210, audio data, and the like.

  The display unit 214 includes a liquid crystal display, EL (Electro Luminescence), etc., and is stored in the terminal memory 212 or provided from an application relay server (not shown) via the communication network 130. GUI (Graphical User Interface) can be displayed. The operation unit 216 includes switches such as a keyboard, a cross key, and a joystick, and receives a user operation input.

  The voice input unit 218 includes voice recognition means such as a microphone, and converts a user voice input during a call into an electrical signal that can be processed in the PHS terminal 110. The voice output unit 220 includes a speaker, and converts the voice signal of the other party received by the PHS terminal 110 into voice and outputs the voice. In addition, a ring tone, an operation sound of the operation unit 216, an alarm sound, and the like can be output.

  The terminal wireless communication unit 222 performs wireless communication with the base station 120 in the communication network 130. The terminal wireless communication unit 222 estimates the communication environment between the PHS terminal 110 and the base station 120 based on the signal-to-interference noise ratio and bit error rate of the uplink transmission data transmitted from the PHS terminal 110 to the base station, Wireless communication using adaptive modulation to perform stable wireless communication by selecting a modulation method having a higher communication rate under a better communication environment and selecting a modulation method having a lower communication rate under a poor communication environment Is possible.

  In addition, the terminal control unit 210 includes a priority item selection unit 230, a voice analysis unit 232, a speed derivation unit 234, an interference wave detection unit 236, an information reception unit 238, a state derivation unit 240, a partner information acquisition request unit 242, and a priority item acquisition. It functions as a request unit 244, a wired determination unit 246, and a change request transmission unit 248.

  The priority item selection unit 230 selects either a priority item of communication quality priority or connectivity priority according to a user setting. The communication quality priority is to give priority to the sound quality in a call and the transmission speed in data communication to the connectivity, and the connectivity priority gives priority to the continuation of the communication connection between the PHS terminal 110 and the base station 120 over the communication quality. That is. Such selection may be performed for each call or data communication, or may be set in advance in the PHS terminal 110 so that such selection is always performed. Further, the service of the communication service provider may be registered in a server owned by the communication service provider so that such a selection is always made.

  In addition, the priority item selection unit 230 can select a priority item of either communication quality priority or connectivity priority according to a change in the communication environment in which the PHS terminal 110 is placed. For example, when the noise level of the voice input to the voice input unit 218 described above exceeds a predetermined noise level, the priority item selection unit 230 selects communication quality priority. Thus, by giving priority to the sound quality when the noise level of the sound exceeds the predetermined noise level, the user can perform wireless communication with a desired communication quality (sound quality).

  The voice analysis unit 232 decomposes and extracts voice from the other party into morphemes, and analyzes the meaning of the wording. When the analyzed word indicates that it is difficult to make a call, the priority item selection unit 230 selects communication quality priority. For example, when the other party speaks a statement that the call is difficult, such as “Eh”, “I can't hear”, “Noisy”, etc., in the present embodiment, this is detected and the communication quality priority, that is, the sound quality priority is automatically set. Therefore, it is possible to perform wireless communication with a desired communication quality for the other party.

  The speed deriving unit 234 derives the moving speed of the PHS terminal 110 itself based on the position of the base station and the number of handovers in the speedometer, the accelerometer, and the handover. When the moving speed exceeds a predetermined speed, the priority item selection unit 230 selects connectivity priority. With this configuration, the user can perform wireless communication with the desired connectivity, regardless of changes in the moving speed, in particular, an increase in moving speed.

  The interference wave detection unit 236 detects an interference wave in the current communication channel through the terminal wireless communication unit 222. When an interference wave is detected, the priority item selection unit 230 selects connectivity priority. Thus, by giving priority to connectivity, interference waves to the PHS terminal 110 can be avoided, and the user can perform wireless communication with the desired connectivity.

  The information receiving unit 238 transmits, through the terminal wireless communication unit 222, a transmission method that can be supported by the base station 120, a modulation method that can be supported from the base station 120 that is actually communicating with the base station 120 that can communicate with the base station 120, One or more base station information selected from the group of the resource availability information of the base station 120 and the position information of the base station 120 is received. Here, the transmission system refers to a communication format itself such as CDMA (macro cell system) or TDMA (micro cell system). As modulation schemes, 256QAM, 64QAM, 16QAM, QPSK, and BPSK are prepared in descending order of transmission speed. The transmission distance of radio waves becomes longer as the transmission speed is lower. The empty slots indicate the number of slots not occupied by other PHS terminals, for example, and assuming that the transmission rate in one slot is 32 kbps, data communication of 128 kbps is possible in four slots. The position information indicates an absolute position such as a latitude and longitude of the fixed base station 120 or a relative position from a predetermined point.

  The state deriving unit 240 determines a communication state necessary for achieving the priority item selected by the priority item selecting unit 230 based on the base station information including the transmission method, modulation method, resource availability information, and position information. To derive.

  For example, when the base station information includes a compatible transmission method, the state deriving unit 240 derives a short-distance transmission method such as TDMA when communication quality priority is selected, and connectivity priority is determined. When selected, a transmission system for long-distance transmission such as CDMA is derived. With this configuration, wireless communication based on a transmission method suitable for the priority item desired by the user can be performed.

  FIG. 4 is an explanatory diagram for explaining the derivation of the transmission method. Here, an umbrella structure is configured by overlapping two types of cells, a plurality of micro cells 260 having a small communication area by the TDMA method and a macro cell 262 having a larger communication range than the micro cell 260 by the CDMA method. However, the two types of cells are managed by the same relay server 140 in the same wireless communication system 100.

  Therefore, for example, the PHS terminal 110 in the communicable range of the base station 120D belonging to the microcell 260 can select radio communication with the base station 120E belonging to the macrocell 262 in addition to the base station 120D. In addition, it is possible to freely perform handover between the base station 120D and the base station 120E. The microcell 260 and the macrocell 262 have the following advantages depending on the size of the communicable range.

  For example, in the micro cell 260, (1) since the distance between the PHS terminal 110 and the base station 120D is short (for example, within 500 m), the transmission power of the PHS terminal 110 can be suppressed, and the battery length is reduced by reducing power consumption. Time use becomes possible. (2) Similarly, since the transmission power of the base station 120D can be reduced, the microcell base station 120 can be reduced in size and weight, and can be installed in a small occupied area. (3) Since the frequency use efficiency can be improved, the radio capacity per unit area can be increased. Also, since the macro cell 262 has a wide communication allowable range with the PHS terminal 110, it is not necessary to frequently change the base station 120E to be communicated even when the PHS terminal 110 moves at high speed, and the handover amount is significant. Reduction is possible. The PHS terminal 110 selects one of the cells according to the communication environment and the movement state of the PHS terminal 110 itself.

  By properly using the transmission method in this way, for example, when getting on a car or a train, connectivity priority can be selected in advance as a priority item, and the problem that communication is interrupted during file download is less likely to occur.

  In addition, when the base station information includes a compatible modulation scheme, the state deriving unit 240 derives the modulation scheme with the highest transmission rate when the communication quality priority is selected, and the connectivity priority is selected. The modulation scheme with the lowest transmission rate is derived.

  FIG. 5 is an explanatory diagram for explaining the derivation of the modulation scheme. In FIG. 5, the communicable range of each modulation method is shown with the base station 120 as the center. In the present embodiment, 256QAM, 64QAM, 16QAM, QPSK, and BPSK are shown in ascending order of the communicable range. For example, when the PHS terminal 110 is in the position shown in FIG. 5, the modulation schemes that can be communicated are 16QAM, QPSK, and BPSK. If communication is performed with the current QPSK, 16QAM is used when priority is given to communication quality. In addition, when priority is given to connectivity, the modulation method can be changed to BPSK.

  Similarly, in a situation where the base station 120 is installed close enough to be visually recognized, when the call is connected by BPSK, the user operates the operation unit 216 on the PHS terminal 110 to make a call by QPSK. The connection can be switched.

  In addition, when the resource availability information is included in the base station information and the communication quality priority is selected, the state deriving unit 240 compares the resource availability information of the plurality of base stations 120, and the base station with the most available resources Deriving execution of handover to 120.

  FIG. 6 is an explanatory diagram for explaining handover of the base station 120 based on resource availability information. In FIG. 6, when the communication quality priority is selected when the PHS terminal 110 is performing wireless communication with the base station 120A, the PHS terminal 110 acquires resource availability information from the surrounding base stations 120A, 120B, and 120C. Then, a handover with the base station 120C having many empty slots is attempted. By forcibly handing over to the base station 120 having a large number of free resources in this way, the user can perform wireless communication with desired communication quality. For example, in the case where the data transmission speed is desired to be further increased in data communication. It is possible to select a base station 120 having a large amount of resources.

  Further, when the position information is included in the base station information and the communication quality priority is selected, the state deriving unit 240 receives the position information of the plurality of base stations and the GPS signal from the GPS satellite 290 (see FIG. 2). Alternatively, execution of a handover to the nearest base station 120 is derived based on position information of the PHS terminal 110 based on three-point positioning using radio signals from a plurality of base stations.

  FIG. 7 is an explanatory diagram for explaining handover of the base station 120 based on position information. When PHS terminal 110 is performing wireless communication with base station 120A in FIG. 7 and communication quality priority is selected, PHS terminal 110 acquires location information from surrounding base stations 120A, 120B, and 120C, A handover with the base station 120B closer to the current base station 120A is attempted. By forcibly handing over to the short-range base station 120 in this way, the user can perform wireless communication with desired communication quality.

  The partner information acquisition request unit 242 requests the base station 120 to acquire the transmission method or modulation method with which the communication partner PHS terminal is actually communicating. The base station 120 acquires the base station 120 accommodating the communication partner PHS terminal through the relay server 140 and transmits it to the PHS terminal 110. The state deriving unit 240 derives the transmission scheme or modulation scheme acquired from the base station 120 in response to the modulation scheme acquisition request as it is as the communication state. When the transmission method or modulation method of each PHS terminal 110 is different, one becomes a bottleneck and obstructs comfortable wireless communication. Here, by combining the transmission method or modulation method with the communication partner PHS terminal 110, it is possible to perform optimum wireless communication without under and over specs.

  The priority item acquisition request unit 244 requests the base station 120 to acquire the priority item selected in the communication partner PHS terminal. The base station 120 acquires the priority item set in the communication partner PHS terminal through the relay server 140 and transmits it to the PHS terminal 110. The state deriving unit 240 derives a communication state necessary for achieving the priority item acquired in response to the priority item acquisition request. Here, priority items can be matched with the communication partner PHS terminal, and communication quality or connectivity is prioritized in both, and optimal wireless communication can be performed.

  The wired determination unit 246 determines whether or not the communication partner is connected to the communication network by wire. If it is determined as wired, the state deriving unit 240 may derive a wired communication band. The communication band (dynamic range) in the wired connection is, for example, 32 kHz, and it is possible to perform the optimum wireless communication without under and over specs by adjusting the wireless communication to the communication band.

  The change request transmission unit 248 changes a difference between the communication state derived by the state deriving unit 240 and the actual communication state with the base station 120, for example, a different transmission method, a different modulation method, and a different base station. It transmits to the base station 120 as a request.

(Base station 120)
FIG. 8 is a block diagram illustrating a schematic configuration of the base station 120. The base station 120 includes a base station control unit 310, a base station memory 312, a base station wireless communication unit 314, and a base station wired communication unit 316.

  The base station control unit 310 manages and controls the entire base station 120 using a semiconductor integrated circuit including a central processing unit (CPU). Further, the base station control unit 310 controls communication connection of the PHS terminal 110 to the communication network 130 and other PHS terminals 110 using a program in the base station memory 312. The base station memory 312 includes a ROM, RAM, EEPROM, nonvolatile RAM, flash memory, HDD, and the like, and stores programs processed by the base station control unit 310, time information, and the like.

  The base station radio communication unit 314 can establish communication with the PHS terminal 110 and adaptively change the modulation scheme and codec according to the communication quality of the PHS terminal 110. The base station wired communication unit 316 can be connected to various servers including the relay server 140 via the communication network 130.

  The base station control unit 310 also functions as an information transmission unit 330, a request reception unit 332, and a request execution unit 334.

  The information transmission unit 330 transmits to the PHS terminal 110 one or more base station information selected from the group of transmission methods that can be handled by the base station 120, modulation methods that can be handled, resource availability information, and position information. .

  The request receiving unit 332 receives a change request generated by the PHS terminal 110. The request execution unit 334 executes communication with the PHS terminal 110 according to the communication state indicated in the change request.

  With the configuration of the PHS terminal 110 and the base station 120, the user can easily select communication quality (sound quality in the case of a call, transmission speed in the case of data communication) priority or connectivity priority. It is possible to easily realize a desired communication state according to the situation at that time, such as having to receive a call or a large amount of data at an early stage, or wanting to secure connectivity because the moving speed is high.

  In this embodiment, since base station information is collected in advance from a plurality of base stations 120, the maximum allowable communication quality or connectivity of the base station 120 can be achieved without losing the overall balance of the radio communication system 100. It becomes possible to receive. Hereinafter, a wireless communication method capable of wireless communication using the priority item desired by the user through the above-described PHS terminal 110 and the base station 120 will be described.

(Wireless communication method)
FIG. 9 is a sequence diagram illustrating specific processing of the wireless communication method. When the PHS terminal 110 starts communication with the base station 120 (S400), the PHS terminal 110 acquires base station information for every predetermined period from all the communicable base stations 120 (S402).

  In the PHS terminal 110, when the user has selected one of the priority items of communication quality priority or connectivity priority, or one of the priority items was automatically selected according to a change in the communication environment. In the case (S404), based on the base station information from each base station 120, a communication state necessary for achieving the selected priority item is derived (S406), and the derived communication state and the base station 120 are derived. The difference from the actual communication state is transmitted to the base station 120 as a change request (S408).

  Upon receiving the change request from the PHS terminal 110, the base station 120 determines whether wireless communication with the PHS terminal 110 according to the communication state indicated in the change request is possible (S410). Wireless communication is executed (S412).

  By such a wireless communication method, the communication state desired by the user can be easily achieved by only a simple configuration such as selection of priority items without losing the overall balance of the wireless communication system 100, similarly to the wireless communication system 100 described above. It can be realized.

  As mentioned above, although preferred embodiment of this invention was described referring an accompanying drawing, it cannot be overemphasized that this invention is not limited to this embodiment. It will be apparent to those skilled in the art that various changes and modifications can be made within the scope of the claims, and these are naturally within the technical scope of the present invention. Understood.

  Note that each step in the wireless communication method of the present specification does not necessarily have to be processed in time series in the order described as a sequence diagram, and may include processing in parallel or by a subroutine.

  The present invention can be used for a wireless communication system, a base station, a mobile station, and a wireless communication method capable of wireless communication.

It is explanatory drawing which showed the rough connection relation of the radio | wireless communications system. It is the functional block diagram which showed the hardware constitutions of the PHS terminal. It is the perspective view which showed the external appearance of the PHS terminal. It is explanatory drawing for demonstrating derivation | leading-out of a transmission system. It is explanatory drawing for demonstrating derivation | leading-out of a modulation system. It is explanatory drawing for demonstrating the hand-over of the base station by resource availability information. It is explanatory drawing for demonstrating the hand-over of the base station by a positional information. It is the block diagram which showed the schematic structure of the base station. It is the sequence diagram which showed the specific process of the radio | wireless communication method.

Explanation of symbols

100 ... Wireless communication system 110 ... PHS terminal (mobile station)
120 ... base station 218 ... voice input section 230 ... priority item selection section 232 ... voice analysis section 234 ... speed derivation section 236 ... interference wave detection section 238 ... information reception section 240 ... state derivation section 242 ... partner information acquisition request section 244 ... Priority item acquisition request unit 246 ... Wired determination unit 248 ... Change request transmission unit 260 ... GPS satellite 330 ... Information transmission unit 332 ... Request reception unit 334 ... Request execution unit

Claims (13)

A wireless communication system including a plurality of base stations and a mobile station capable of wireless communication with the base station,
The base station
An information transmission unit that transmits one or more base station information selected from a group of a compatible transmission method, a compatible modulation method, resource availability information, and position information to the mobile station;
A request receiving unit for receiving a communication state change request from the mobile station;
A request execution unit that executes communication with the mobile station according to the communication state indicated in the change request;
With
The mobile station
An information receiving unit for receiving the base station information from the base station;
A priority item selection unit for selecting a priority item of communication quality priority or connectivity priority according to a change in user settings or communication environment;
A state deriving unit for deriving a communication state necessary to achieve the selected priority item based on the base station information;
A change request transmission unit that transmits a difference between the derived communication state and the actual communication state of the base station to the base station as a change request;
A speech analysis unit that decomposes and extracts speech from the other party into morphemes and analyzes the meaning of the wording,
The wireless communication system , wherein the priority item selection unit selects communication quality priority when the wording indicates that it is difficult to talk .   When the base station information includes a compatible transmission method, the state deriving unit derives a short-distance transmission method when communication quality priority is selected, and connectivity priority is selected. 2. The wireless communication system according to claim 1, wherein a long-distance transmission method is derived.   When the base station information includes a compatible modulation scheme, the state deriving unit derives a modulation scheme having the highest transmission rate when communication quality priority is selected, and connectivity priority is selected. 3. The wireless communication system according to claim 1 or 2, wherein a modulation scheme having the lowest transmission rate is derived.   When the resource availability information is included in the base station information and communication quality priority is selected, the state deriving unit compares the resource availability information of a plurality of base stations, and determines to the base station with the most available resources. The wireless communication system according to any one of claims 1 to 3, wherein execution of handover is derived.   When the location information is included in the base station information and the communication quality priority is selected, the state deriving unit is configured to receive the location information of a plurality of base stations and GPS signals or radio signals from a plurality of base stations. 5. The wireless communication system according to claim 1, wherein execution of a handover to a base station having the closest distance is derived based on position information of the mobile station based on point positioning. 6. .   The mobile station further comprises a voice input unit for acquiring voice, and when the noise level of the voice exceeds a predetermined noise level, the priority item selection unit selects communication quality priority. The wireless communication system according to any one of 1 to 5. The mobile station further includes a speed deriving unit for deriving its own moving speed, and when the moving speed exceeds a predetermined speed, the priority item selecting unit selects connectivity priority. The wireless communication system according to any one of items 1 to 6 . The mobile station further includes an interference wave detection unit that detects an interference wave in a current communication channel, and the priority item selection unit selects connectivity priority when an interference wave is detected. The wireless communication system according to any one of 1 to 7 . The mobile station further includes a partner information acquisition request unit that requests acquisition of a transmission scheme or a modulation scheme with which the mobile station of the communication counterpart communicates, and the state derivation unit acquires in response to the request for acquiring the modulation scheme transmission system or a wireless communication system according to any one of claims 1 8, characterized in that for deriving the modulation scheme and. The mobile station further includes a priority item acquisition request unit that requests acquisition of a priority item selected in a mobile station of a communication partner, and the state derivation unit is a priority item acquired in response to the priority item acquisition request The wireless communication system according to any one of claims 1 to 9 , wherein a communication state necessary for achieving the above is derived. The mobile station further includes a wired determination unit that determines whether or not the communication partner is connected to the communication network by wire, and when the mobile station is determined to be wired, the state deriving unit derives a wired communication band. the wireless communication system according to claim 1, any one of 10, wherein. A mobile station capable of wireless communication with a base station,
An information receiving unit that receives from the base station one or more base station information selected from a group of a compatible transmission method, a compatible modulation method, resource availability information, and position information;
A priority item selection unit for selecting a priority item of communication quality priority or connectivity priority according to a change in user settings or communication environment;
A state deriving unit for deriving a communication state necessary to achieve the selected priority item based on the base station information;
A change request transmission unit that transmits a difference between the derived communication state and the actual communication state of the base station to the base station as a change request;
A speech analysis unit that decomposes and extracts speech from the other party into morphemes and analyzes the meaning of the wording,
The mobile station , wherein the priority item selection unit selects communication quality priority when the wording indicates that it is difficult to talk . A wireless communication method using a plurality of base stations and a mobile station capable of wireless communication with the base station,
The base station transmits to the mobile station one or more base station information selected from a group of compatible transmission schemes, compatible modulation schemes, resource availability information, and location information,
The mobile station
Receiving the base station information from the base station;
Select either the priority item of communication quality priority or connectivity priority according to changes in user settings or communication environment,
When the voice from the other party is decomposed and extracted into morphemes, the meaning of the wording is analyzed, and the meaning that the wording is difficult to call is indicated, the priority item selection unit selects the communication quality priority,
Based on the base station information, deriving a communication state necessary to achieve the selected priority item,
The difference between the derived communication state and the actual communication state with the base station is transmitted to the base station as a change request,
The base station
Receiving a change request from the mobile station;
A wireless communication method comprising executing communication with the mobile station according to a communication state indicated in the change request.

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