JP5179964B2 - Communication method determination method, communication method determination system - Google Patents

Description

  The present invention relates to a communication method determination method and a communication method determination system in mobile communication, and more particularly to a MIMO (Multi-Input Multi-Output) method and a non-MIMO method (for example, a SISO (Single-Input Single-Output) method). ) And a communication method determination system for performing such a determination when selectively applying any one of the plurality of communication methods.

  The MIMO system is a communication system that transmits information using a plurality of antennas, and has recently been developed as a communication system that can dramatically improve a transmission bit rate without increasing a frequency spectrum and improve reception quality. It is attracting attention (see, for example, Non-Patent Document 1). For this reason, for example, research on the application of MIMO is also progressing as a wireless communication system suitable for the case of transmitting a large amount of data such as image data at high speed.

However, the MIMO communication system strongly depends on propagation environment conditions such as received power, antenna spatial correlation, and moving speed. That is, in an environment with low received power and an environment with high antenna correlation, it is difficult to separate signals in the MIMO scheme, and the multiplexing effect deteriorates.
In addition, when moving at a high speed, the effect of the MIMO method deteriorates due to the influence of Doppler fading.

It is already known from many experimental results that the signal transmission speed in the MIMO system may be inferior to that of the conventional SISO system depending on the various propagation environments as described above.
Further, depending on the amount of service data and the required QoS quality, the SISO system can perform more reliable communication.
Therefore, it is necessary to determine whether or not to apply the MIMO scheme according to the conditions of the propagation environment and the data amount of the service.
Various techniques for applying this method under conditions suitable for applying the MIMO method have been proposed.
For example, there is a proposal to selectively apply one of the MIMO method and the directional communication method according to either the communication quality of the MIMO method or the communication quality of the directional communication method (for example, Patent Document 1). reference).

In the proposal of Patent Document 1, based on the MIMO pilot signal demodulated by the MIMO reception processing function unit that performs communication (reception) by the MIMO method, communication quality in the case of the MIMO method, for example, reception SIR (Signal to Interference Ratio) Measure.
On the other hand, the diversity reception signal processing function unit demodulates the signal transmitted from the base station in the directional communication method, and based on the beamforming pilot signal in the demodulated signal, the communication quality in the directional communication method, For example, the received SIR is measured.

Then, based on at least one of the measurement values of each reception SIR by both of these methods, either one of the MIMO method and the directional communication method is selectively applied by the switching control means.
Prior to Patent Document 1, a technique for switching and applying different communication methods is more generally proposed than the proposal of Patent Document 1 described above.
That is, communication type information indicating the type of communication used by the user using the mobile device is acquired by the communication type information acquisition means, and based on the communication type information, between the mobile device used by the user and the base station This is a proposal to switch the wireless communication system applied to the communication (for example, see Patent Document 2).

On the other hand, in a technique for reducing the level difference of received signals and increasing the sensitivity without increasing the number of antenna elements in MIMO communication, it is proposed to switch the communication method from the MIMO method to the SISO method depending on the situation. (For example, refer to Patent Document 3).
Furthermore, a technique has been proposed in which either the adaptive array method or the MIMO method is appropriately determined, and both methods are switched while maintaining communication continuity (for example, Patent Document 4 and 5).

JP 2006-287669 A (summary, claim 1, paragraphs 0012 to 0021) JP 2003-125447 A (summary, claim 1, paragraphs 0048 to 0049) JP 2008-72704 A (Claim 5, Claim 6, Paragraph 0099, etc.) JP 2007-124207 A (Summary, Claims 1, Claim 3, Paragraph 0036, etc.) JP 2006-270730 A (summary, claim 1, paragraphs 0020 to 0022) “Introduction to Space-Time Wireless Communication”, “2003”, “Arogyaswami Paulraj, Rohit Nabar, Dhananjay Gore”, “Cambridge University Press”, “ISBN 0-521-82615-2”

On the other hand, MIMO technology is introduced in the current IEEE802.11n wireless LAN system and the near future LTE (Long Term Evolution) mobile communication system (Super 3G). The MIMO communication system can be operated as a conventional SISO communication system by selecting the number of antennas to be used and the form of calculation.
However, when the MIMO system and the SISO system (non-MIMO system) are selectively applied by switching, the criteria for determination in the selection have not yet been defined.

Also, in any of the above-mentioned patent documents, practical judgment criteria that can be selectively applied by switching between the MIMO method and the non-MIMO method in accordance with various conditions considered in the actual situation are used. I couldn't provide it.
The present invention has been made in view of such a situation, and is a practical communication system that can be selectively applied by switching between a MIMO system and a non-MIMO system accurately according to various conditions in an actual communication service. An object is to provide a determination method and a communication method determination system.

In order to solve the above-described problems, the present application proposes the following techniques.
The communication method determination method of claim 1 of the present invention is:
Determination for selectively applying one communication method among a plurality of communication methods including a MIMO (Multi-Input Multi-Output) method and a non-MIMO method not depending on the MIMO method for communication between predetermined nodes. A communication method determination method to be performed,
In response to a service request issued between the nodes, information indicating the contents of the service and subscriber information regarding the mobile terminal device are sent to the service gateway, and based on the information indicating the outline of the used service returned from the service gateway. A service recognition step for recognizing the type of service used corresponding to the service request in communication between the nodes;
A reception quality recognition step for recognizing reception quality in communication between the nodes;
Whether a MIMO scheme or a non-MIMO scheme is applied to communication between the nodes according to the type of service used recognized in the service recognition step and the reception quality recognized in the reception quality recognition step A communication method determination step for determining
Only contains the type of usage services, whether the application of MIMO scheme by a service quality required and the amount of data to be transmitted (QoS) are classified into a plurality of types of hierarchy in the communication system determination step, Whether or not to apply the MIMO scheme to communication between the nodes is determined based on whether the required quality of service (QoS) is higher or lower than a threshold based on QCI that is a class index of service quality .

In the communication method determination method according to claim 1, to selectively apply one communication method among a plurality of communication methods including a MIMO method and a non-MIMO method independent of the MIMO method for communication between predetermined nodes. Judgment is made.
In the use service recognition step, the type of use service in communication between the nodes is recognized.
In the reception quality recognition step, the reception quality in communication between the nodes is recognized.
The order in which both steps of the above-described service usage recognition step and reception quality recognition step are performed is not limited.
In the communication method determination step, either MIMO or non-MIMO communication is used for communication between the nodes according to the type of service used recognized in the service recognition step and the reception quality recognized in the reception quality recognition step. Determine whether to apply the method.

The communication method determination method according to claim 2 of the present invention is:
In the communication method determination method according to claim 1, further comprising a step of recognizing a free space of a wireless resource that recognizes a free space of a wireless resource at a current time point in communication between the nodes,
The communication method determining step includes a type of service used recognized in the service usage recognition step, a reception quality recognized in the reception quality recognition step, and a radio resource free space recognized in the radio resource free capacity recognition step. According to the capacity, it is determined whether a communication method of a MIMO method or a non-MIMO method is applied to communication between the nodes.

In the communication method determination method according to the second aspect, the wireless resource free capacity recognition step recognizes the free capacity of the radio resource at the current time in communication between the nodes.
In particular, in the communication method determination step, the type of service used recognized in the service usage recognition step, the reception quality recognized in the reception quality recognition step, and the wireless resource recognized in the radio resource free capacity recognition step It is determined whether a MIMO or non-MIMO communication method is applied to communication between the nodes according to the available resource capacity.

The communication method determination method of claim 3 of the present invention is:
In the communication method determination method according to claim 1,
The non-MIMO system is any one of a SISO (Single-Input Single-Output) system, a reception diversity system, a transmission diversity system, and an adaptive array antenna system.
In the communication method determination method according to the third aspect, any one of a SISO method, a reception diversity method, a transmission diversity method, and an adaptive array antenna method is applied as the non-MIMO method.

The communication system determination system according to claim 4 of the present invention is:
A communication method for selectively applying one communication method among a plurality of communication methods including a MIMO (Multi-Input Multi-Output) method and a non-MIMO method not depending on the MIMO method for communication between predetermined nodes An overview of a system in which a determination method is implemented,
In response to a service request issued between the nodes, information indicating the contents of the service and subscriber information regarding the mobile terminal device are sent to the service gateway, and based on the information indicating the outline of the used service returned from the service gateway. , used service recognition unit provided to one of the nodes to recognize the type of the usage service corresponding to the service request in the communication and between the node,
A reception quality recognition unit provided in any of the nodes so as to recognize the reception quality in communication between the nodes;
Whether a MIMO scheme or a non-MIMO scheme is applied to communication between the nodes according to the type of service used recognized by the service recognition unit and the reception quality recognized by the reception quality recognition unit A communication method determination unit provided in any of the nodes so as to determine
Only contains the type of usage services, whether the application of MIMO scheme by a service quality required and the amount of data to be transmitted (QoS) are classified into a plurality of types of layers, the communication system determination unit obtains It is characterized in that it is determined whether or not to apply the MIMO scheme to communication between the nodes depending on whether the quality of service (QoS) is higher or lower than a threshold based on QCI that is a class indicator of service quality .

In the communication system determination system according to claim 4, in order to selectively apply one communication system among a plurality of communication systems including a MIMO system and a non-MIMO system independent of the MIMO system for communication between predetermined nodes. Judgment is made.
The use service recognizing unit recognizes the type of use service in communication between the nodes.

The reception quality recognition unit recognizes reception quality in communication between the nodes.
Further, in the communication method determination unit, the MIMO method or the non-MIMO method is used for communication between the nodes according to the type of service used recognized by the service recognition unit and the reception quality recognized by the reception quality recognition unit. Which communication method is to be applied is determined.
The use service recognizing unit, the reception quality recognizing unit, and the communication method determining unit are provided in each corresponding node among the predetermined nodes and function as described above.

The communication system determination system according to claim 5 of the present invention is:
In particular, in the communication system determination system according to claim 4, a radio resource free capacity recognition unit provided in any of the nodes so as to recognize the free capacity of a radio resource at a current time point in communication between the nodes. Further including
The communication method determination unit includes: a type of service used recognized by the service recognition unit; a reception quality recognized by the reception quality recognition unit; and a radio resource vacancy recognized by the radio resource free capacity recognition unit. According to the capacity, it is determined whether a communication method of a MIMO method or a non-MIMO method is applied to communication between the nodes.

In the communication system determination system according to the fifth aspect, the wireless resource free capacity recognition unit recognizes the free capacity of the wireless resource at the current time in communication between the nodes.
In particular, in the communication method determination unit, the type of service used recognized by the service recognition unit, the reception quality recognized by the reception quality recognition unit, and the wireless resource recognized by the radio resource free space recognition unit It is determined whether a MIMO or non-MIMO communication method is applied to communication between the nodes according to the available resource capacity.
The use service recognizing unit, the reception quality recognizing unit, the communication method determining unit, and the radio resource free capacity recognizing unit are provided in each corresponding node among the predetermined nodes and function as described above.

  According to the present invention, a practical communication method determination method and a communication method determination system that can be selectively applied by appropriately switching between a MIMO method and a non-MIMO method according to various conditions in an actual communication service are realized. The

Hereinafter, the present invention will be clarified by describing embodiments of the present invention in detail with reference to the drawings.
In each drawing referred to below, portions related to the main part of the present invention are exaggerated as appropriate, and other portions are appropriately simplified or omitted.
(Configuration of portable information terminal device as first embodiment of the present invention)
FIG. 1 is a conceptual diagram showing an outline of a system in which a communication method determination method of the present invention is implemented.

In FIG. 1, a communication system determination system 10 in which the communication system determination method of the present invention is implemented includes a use service recognition unit 11, a reception quality recognition unit 12, and a communication system determination unit 13.
In one embodiment of the present invention, the communication method determination system 10 may further include a wireless resource free space recognition unit 14 shown by a broken line.

However, in the communication system determination system in which the communication system determination method of the present invention is implemented, it is essential that the wireless resource free capacity recognition unit 14 (radio resource free capacity recognition step, which is a process thereby) is set. It is not a thing.
The use service recognizing unit 11, the reception quality recognizing unit 12, the communication method determining unit 13, and the radio resource free capacity recognizing unit 14 are a predetermined plurality included in the communication method determining system in which the method of the present invention is implemented. Among these nodes, for example, each node is a base station (BTS: Base Transceiver Station) or a mobile terminal device (UE: User Equipment).

There are various types of nodes on which each functional unit, which is the service recognition unit 11, the reception quality recognition unit 12, the communication method determination unit 13, and the wireless resource free space recognition unit 14, is specifically mounted. Examples of these may be selected, examples of which will be described later.
In the above-described configuration, the use service recognition unit 11 recognizes the type of use service in communication between the nodes.

The reception quality recognition unit 12 recognizes the reception quality in communication between the nodes.
The communication method determination unit 13 uses either the MIMO method or the non-MIMO method for communication between the nodes according to the type of service used recognized by the service recognition unit 11 and the reception quality recognized by the reception quality recognition unit 12. To determine whether to apply the communication method.
As will be described in detail later, this determination determines whether to apply a MIMO or non-MIMO communication method according to the service used in the mobile terminal apparatus, and further determines this according to the reception quality in the mobile terminal apparatus. A mode of performing the determination may be adopted, but a mode of performing the determination at a time in consideration of both the use service and the reception quality may be employed.

FIG. 2 is a conceptual diagram illustrating one aspect of the system of FIG. A mobile terminal device (UE) 21 is connected to a base station (BTS) 22 via a radio space WT as an information propagation path, and the base station 22 is connected to a service gateway 23 by a wire.
The service gateway 23 is connected to the Internet 24, and information is acquired from a connection destination site or server 25 connected to the Internet 24.
In the above configuration, the mobile terminal apparatus (UE) 21 transmits a service request to the service gateway 23 through the base station (BTS) 22.
The service gateway 23 detects the connection destination from the information of the mobile terminal device (UE) 21 and the service request, and establishes a connection from the mobile terminal device (UE) 21 to the connection destination site or the server 25.

In FIG. 2, a solid arrow indicated as “service request” from the mobile terminal device (UE) 21 to the base station (BTS) 22, and a direction from the base station (BTS) 22 to the service gateway 23. A solid arrow labeled “user information and request service transmission” indicates a flow of connection control among the mobile terminal device (UE) 21, the base station (BTS) 22, and the service gateway 23.
In addition, the solid arrow line of the connection destination site or server 25 → Internet 24 → service gateway 23 → base station (BTS) 22 → mobile terminal device (UE) 21 represents the data flow with the connection destination.
The part considered as the communication system determination system 20 in the present invention is a part between the mobile terminal device (UE) 21 and the service gateway 23 among the above.

As will be described in detail later, the mobile terminal apparatus (UE) 21 and the base station (BTS) 22 are configured to be able to perform MIMO communication using a plurality of antennas.
In the system of the present invention, information is supplied as indicated by a dashed arrow labeled “Send service summary” from the service gateway 23 to the base station (BTS) 22, and further from the base station (BTS) 22. Information is supplied as indicated by a dashed arrow labeled “MIMO notification” directed to the mobile terminal apparatus (UE) 21, and the MIMO scheme is established between the mobile terminal apparatus (UE) 21 and the base station (BTS) 22. Communication is performed.

FIG. 3 is a functional block diagram showing a first embodiment that does not include the wireless resource free capacity recognition unit 14 in the communication method determination system 10 of FIG.
A communication system determination system 300 corresponding to the communication system determination system 10 of FIG. 1 is configured by connecting a mobile terminal device 310 and a base station 350 through a wireless space WT that is a wireless information propagation path.
The mobile terminal device 310 is provided with a transmission / reception unit 313 that is connected to an antenna circuit 312 including a plurality of antennas 311 and transmits / receives information to / from the outside wirelessly. It is configured to be detected.

The antenna circuit 312, the transmission / reception unit 313, and the reception level measurement unit 314 are managed by a control unit 315 that comprehensively manages the operation of the mobile terminal device 310, and are related to operations from the operation unit 316 that accepts user operations. A signal is also input to the control unit 315.
The control unit 315 is configured mainly with a microprocessor, for example, and moves so as to operate according to the notified communication method when notified from the base station 350 side of the communication method applied to the communication with the base station 350. A communication method setting unit 317 is provided for setting each corresponding unit on the terminal device 310 side.

  On the other hand, the base station 350 includes a plurality of antennas 351a and wirelessly transmits / receives information to / from one or a plurality of mobile terminal apparatuses, a service request accepting unit 352, a service / user information acquiring unit 353, and a service recognition. A unit 354, a reception quality information acquisition unit 355, and a reception quality recognition unit 356 are provided, and are configured to be managed by a control unit 317 that collectively manages the operation of the base station 350.

In this control unit 357, a communication method determination unit 358 described later is set.
The service request accepting unit 352 executes accepting processing related to a service request from the mobile terminal device 310 side.
The service / user information acquisition unit 353 acquires user information by communication with an HLR (Home Location Register) (not shown) or the like as is generally performed in the process of establishing a transmission path for communication in this type of mobile communication. To do.

The use service recognition unit 354 communicates with the service gateway 23 (FIG. 2) based on the service request content based on the operation from the user received by the service request reception unit 352 and the user information acquired by the service / user information acquisition unit 353. Based on the exchange of information, the type of service used for communication intended by the user is determined and recognized.
The reception quality information acquisition unit 355 acquires the reception level information detected by the reception level measurement unit 314 of the mobile terminal device 310 and transmitted and received by the wireless communication unit 351 as reception quality information.

Furthermore, the reception quality recognition unit 356 recognizes the reception quality in the mobile terminal device 310 based on the information acquired by the reception quality information acquisition unit 355.
As described above, based on the information regarding the type of service used recognized by the service recognition unit 354 and the information regarding the reception quality in the mobile terminal device 310 recognized by the reception quality recognition unit 356, the control unit 357 A communication method determination unit 358 determines a communication method to be applied to communication between the mobile terminal device 310 and the base station 350. Details of this determination will be described later with reference to the drawings as appropriate.

As can be easily understood from the above description, in the first embodiment of the present invention shown in FIG.
In this way, the type of communication method determined by the base station 350 (its communication method determination unit 358) is notified from the wireless communication unit 351 to the control unit 315 from the antenna circuit 312 of the mobile terminal device 310 through the wireless space WT.
When the communication method determined as described above is the MIMO method, based on this notification, the communication method setting unit 317 provided in the control unit 315 performs antenna application and calculation in the antenna circuit 312. Is set to a mode suitable for performing MIMO communication.

On the other hand, when the communication method determined as described above is a non-MIMO method other than the MIMO method, the communication method setting unit 317 provided in the control unit 315 performs the antenna in the antenna circuit 312 based on this notification. Is set to a form suitable for performing non-MIMO communication.
Here, as the non-MIMO system, any one of a SISO (Single-Input Single-Output) system, a reception diversity system, or a transmission diversity system can be selected.

FIG. 4 is a functional block diagram showing a second embodiment of the present invention including a radio resource free capacity recognition unit 14 in the communication system determination system 10 of FIG.
A communication system determination system 400 corresponding to the communication system determination system 10 of FIG. 1 is configured by connecting a mobile terminal device 410 and a base station 450 by a wireless space WT which is a wireless information propagation path.
The configuration of the mobile terminal device 410 in the communication method determination system 400 is the same as that in the first embodiment of FIG.

That is, the mobile terminal apparatus 410 is provided with a transmission / reception unit 413 that is connected to an antenna circuit 412 having a plurality of antennas 411 and exchanges information with the outside wirelessly, and the reception level in the transmission / reception unit 413 is a reception level measurement unit. 414 is configured to be detected.
The antenna circuit 412, the transmission / reception unit 413, and the reception level measurement unit 414 are managed by a control unit 415 that comprehensively manages the operation of the mobile terminal device 410. The control unit 415 is configured to be input.

In addition, the control unit 415 is configured mainly with a microprocessor, for example, and operates according to the notified communication method when notified from the base station 450 side of a communication method to be applied to communication with the base station 450. Is provided with a communication method setting unit 417 for setting the corresponding units on the mobile terminal device 410 side.
On the other hand, the base station 450 includes a wireless communication unit 451 having a plurality of antennas 451a, a service request accepting unit 452, a service / user information acquiring unit 453, a used service recognizing unit 454, a reception quality information acquiring unit 455, and a reception quality. The configuration in which the recognition unit 456 is provided and these are collectively managed by the control unit 457 is the same as that of the first embodiment in FIG.

In particular, in the second embodiment of FIG. 4, a wireless resource free capacity recognition unit 459 is provided, and the wireless resource free capacity recognition unit 459 recognizes the free capacity of wireless resources in communication at the current time point. .
The communication method determination unit 458 provided in the control unit 457 is configured to determine the communication method in consideration of the wireless resource free space recognition by the wireless resource free space recognition unit 459. 3 is different from the first embodiment.

  That is, the communication method determination unit 458 of the control unit 457 includes information regarding the type of service used recognized by the service recognition unit 454 and information regarding reception quality at the mobile terminal device 410 recognized by the reception quality recognition unit 456. In addition, a communication method applied to communication between the mobile terminal device 410 and the base station 450 is determined based on the information regarding the free space of the wireless resource in the communication at the current time point recognized by the wireless resource free space recognition unit 459. Details of this determination will be described later with reference to the drawings as appropriate.

As described above, also in the second embodiment of the present invention shown in FIG. 4, the determination of the communication method is performed in the form of the base station 450 initiative.
In this way, the type of communication method determined by the base station 450 (its communication method determination unit 458) is notified from the wireless communication unit 451 to the control unit 415 from the antenna circuit 412 of the mobile terminal device 410 through the wireless space WT.
When the communication method determined as described above is the MIMO method, based on this notification, the communication method setting unit 417 provided in the control unit 415 performs antenna application and calculation in the antenna circuit 412. Is set to a mode suitable for performing MIMO communication.

On the other hand, when the communication method determined as described above is a non-MIMO method other than the MIMO method, the communication method setting unit 417 provided in the control unit 415 determines that the antenna in the antenna circuit 412 is based on this notification. Is set to a form suitable for performing non-MIMO communication.
Similar to the embodiment of FIG. 3, as the non-MIMO system, any one of the SISO system, the reception diversity system, and the transmission diversity system can be selected.

FIG. 5 is a functional block diagram showing a third embodiment of the present invention that does not include the wireless resource free space recognition unit 14 in the communication method determination system 10 of FIG.
A communication system determination system 500 corresponding to the communication system determination system 10 of FIG. 1 is configured by connecting a mobile terminal device 510 and a base station 550 by a wireless space WT which is a wireless information propagation path.
The mobile terminal device 510 is provided with a transmission / reception unit 513 to which an antenna circuit 512 having a plurality of antennas 511 is connected and exchanges information with the outside wirelessly. The reception level in the transmission / reception unit 513 is changed by the reception level measurement unit 514. It is configured to be detected.

The mobile terminal device 510 is further provided with an operation unit 516, a use service recognition unit 517, and a reception quality recognition unit 518.
The operation unit 516 accepts an operation by the user and generates a signal representing the accepted operation.
The use service recognition unit 517 determines and recognizes the type of use service related to the communication intended by the user by exchanging information with the base station 550 side, as will be described later.

Reception quality recognition section 518 recognizes the reception quality in mobile terminal apparatus 510 based on the reception level information detected by reception level measurement section 514.
The antenna circuit 512, the transmission / reception unit 513, the reception level measurement unit 514, the use service recognition unit 517, and the reception quality recognition unit 518 described above are managed by the control unit 515 that collectively manages the operation of the mobile terminal device 510. In addition, a signal related to an operation from the operation unit 516 that receives an operation by the user is also input to the control unit 515.

For example, the control unit 515 is mainly composed of a microprocessor, and is provided with a communication method determination unit 519 and a communication method setting unit 520.
Based on the information indicating the type of service used by the service recognition unit 517 and the information indicating the reception quality recognized by the reception quality recognition unit 518, the communication method determination unit 519 The communication method applied to the communication is determined.

Further, the communication method setting unit 520 sets the corresponding units of the mobile terminal device 510 so as to operate according to the communication method determined by the communication method determination unit 519.
On the other hand, the base station 550 includes a wireless communication unit 551 that includes a plurality of antennas 551a and transmits / receives information to / from one or a plurality of mobile terminal devices, a service request reception unit 552, and a service / user information acquisition unit 553. These are configured to be managed by a control unit 554 that comprehensively manages the operation of the base station 550.

The service request accepting unit 552 executes an accepting process related to a service request from the mobile terminal device 510 side.
The service / user information acquisition unit 553 acquires user information by communication with an unillustrated HLR (Home Location Register), etc., as is generally performed in the process of establishing a transmission path for communication in this type of mobile communication. To do.
The service / user information acquisition unit 553 also determines the user based on the request contents of the service based on the operation from the user received by the service request reception unit 552 and the user information acquired by the service / user information acquisition unit 553. Obtains information related to the type of service used for communication intended by.

Information acquired by the service / user information acquisition unit 553 as described above is supplied to the mobile terminal device 510 through the wireless communication unit 551.
The use service recognition unit 517 of the mobile terminal device 510 determines the type of use service related to the communication intended by the user based on the information acquired by the service / user information acquisition unit 553 and supplied through the wireless communication unit 551. recognize.

  As described above, on the mobile terminal device 510 side, the communication method determination unit 519 includes information indicating the type of service used and the reception quality recognition unit 518 recognized by the service recognition unit 517 as described above. The mobile terminal apparatus determines a communication method to be applied to communication with the base station 550 based on the information indicating the reception quality recognized by the mobile terminal so that the communication method setting unit 520 operates according to the determined communication method. Each corresponding part 510 is set. Details of this determination will be described later with reference to the drawings as appropriate.

As can be easily understood from the above description, in the third embodiment of the present invention shown in FIG. 5, the determination of the communication method is performed in the form of the mobile terminal device 510.
When the communication method determined as described above is the MIMO method, based on this determination, the communication method setting unit 520 provided in the control unit 515 applies the antenna application and calculation in the antenna circuit 512. Is set to a mode suitable for performing MIMO communication.

On the other hand, when the communication method determined as described above is a non-MIMO method other than the MIMO method, the communication method setting unit 520 provided in the control unit 515 performs the antenna in the antenna circuit 512 based on this determination. Is set to a form suitable for performing non-MIMO communication.
Here, as the non-MIMO system, any one of the SISO system, the reception diversity system, and the transmission diversity system can be selected.

FIG. 6 is a functional block diagram showing a fourth embodiment of the present invention including a radio resource free capacity recognition unit 14 in the communication method determination system 10 of FIG.
A communication system determination system 600 corresponding to the communication system determination system 10 of FIG. 1 is configured by connecting a mobile terminal device 610 and a base station 650 by a wireless space WT which is a wireless information propagation path.
The configuration of the mobile terminal device 610 in the communication system determination system 600 includes the same part as that in the third embodiment of FIG. 5 and further includes a radio resource free capacity recognition unit 621 described later.

That is, the mobile terminal device 610 is provided with a transmission / reception unit 613 that is connected to an antenna circuit 612 having a plurality of antennas 611 and transmits / receives information to / from the outside wirelessly. 614 to be detected.
The mobile terminal device 610 is further provided with an operation unit 616, a use service recognition unit 617, a reception quality recognition unit 618, and a radio resource free capacity recognition unit 621.

The operation unit 616 accepts an operation by the user and generates a signal representing the accepted operation.
In addition, the use service recognition unit 617 determines and recognizes the type of use service related to the communication intended by the user by exchanging information with the base station 650 as described later.
The reception quality recognition unit 618 recognizes the reception quality in the mobile terminal device 610 based on the reception level information detected by the reception level measurement unit 614.

Furthermore, the radio resource free capacity recognition unit 621 recognizes the free capacity of radio resources in communication at the current time point based on information supplied from the base station 650 side, as will be described later.
The antenna circuit 612, the transmission / reception unit 613, the reception level measurement unit 614, the use service recognition unit 617, the reception quality recognition unit 618, and the radio resource free capacity recognition unit 621 described above perform operations of the mobile terminal device 610. A signal related to an operation from an operation unit 616 that is managed by a control unit 615 that performs overall management and accepts an operation by a user is also input to the control unit 615.

For example, the control unit 615 is mainly composed of a microprocessor, and includes a communication method determination unit 619 and a communication method setting unit 620.
In particular, in the fourth embodiment of FIG. 6, a wireless resource free capacity recognition unit 621 is provided, and the wireless resource free capacity recognition unit 621 recognizes the free capacity of wireless resources in communication at the current time point. .

The wireless resource free space recognition unit 621 recognizes the free space of wireless resources in communication at the current time point based on information supplied from the wireless resource free space information acquisition unit 655 of the base station 650 described later through the wireless communication unit 651. To do.
The communication method determination unit 619 provided in the control unit 615 is configured to determine the communication method in consideration of the recognition of the free space of the wireless resource by the wireless resource free space recognition unit 621. 5 is different from the mobile terminal device 510 as the third embodiment.

  That is, the communication method determination unit 619 of the control unit 615 includes information related to the type of service used recognized by the service recognition unit 617 and information related to reception quality in the mobile terminal device 610 recognized by the reception quality recognition unit 618. In addition, a communication method to be applied to the communication between the mobile terminal device 610 and the base station 650 is determined based on the information regarding the free space of the wireless resource in the communication at the current time point recognized by the wireless resource free space recognition unit 621. Details of this determination will be described later with reference to the drawings as appropriate.

On the other hand, the configuration of the base station 650 is also partially the same as that of the third embodiment shown in FIG.
That is, a wireless communication unit 651 that includes a plurality of antennas 651a and transmits / receives information to / from one or a plurality of mobile terminal devices wirelessly, a service request reception unit 652, and a service / user information acquisition unit 653 are provided. It is configured to be managed by a control unit 654 that comprehensively manages the operation of the base station 650.
The service request accepting unit 652 executes accepting processing related to a service request from the mobile terminal device 610 side.
The service / user information acquisition unit 653 acquires user information through communication with an HLR (Home Location Register) (not shown) or the like, as is generally performed in the process of establishing a transmission path for communication in this type of mobile communication. To do.

The service / user information acquisition unit 653 also determines the user based on the service request content based on the operation from the user received by the service request reception unit 652, the user information acquired by the service / user information acquisition unit 653, and the like. Obtains information related to the type of service used for communication intended by.
In particular, in the fourth embodiment of FIG. 6, a radio resource free capacity information acquisition unit 655 is provided, and the radio resource free capacity information acquisition unit 655 provides information on the free capacity of radio resources in communication at the current time point. Is acquired.

The information acquired by the service / user information acquisition unit 653 and the information acquired by the wireless resource free space information acquisition unit 655 as described above are supplied to the mobile terminal device 610 through the wireless communication unit 651, as described above. Is recognized by the wireless resource free space recognition unit 621.
The use service recognition unit 617 of the mobile terminal device 610 determines the type of use service related to the communication intended by the user based on the information acquired by the service / user information acquisition unit 653 and supplied through the wireless communication unit 651. recognize.

  On the mobile terminal device 610 side, the communication method determination unit 619 has received information recognized by the reception quality recognition unit 618 and the information indicating the type of service used by the service recognition unit 617 as described above. Based on the information indicating the quality and the information on the free space of the wireless resource recognized by the wireless resource free space recognition unit 621, a communication method to be applied to the communication with the base station 650 is determined, and the communication method setting unit 620 is determined. However, each corresponding part of the mobile terminal device 610 is set so as to operate according to the determined communication method. Details of this determination will be described later with reference to the drawings as appropriate.

As described above, in the fourth embodiment of the present invention shown in FIG. 6 as well, as in the third embodiment of the present invention shown in FIG. It is.
When the communication method determined as described above is the MIMO method, based on this determination, the communication method setting unit 620 provided in the control unit 615 applies the antenna in the antenna circuit 612 and the calculation. Is set to a mode suitable for performing MIMO communication.

On the other hand, when the communication method determined as described above is a non-MIMO method other than the MIMO method, based on this determination, the communication method setting unit 620 provided in the control unit 615 causes the antenna circuit 612 to Is set to a form suitable for performing non-MIMO communication.
Here, as the non-MIMO system, any one of the SISO system, the reception diversity system, and the transmission diversity system can be selected.

As described above, the mobile terminal device, the base station, and the service in the communication system determination system as the first to fourth embodiments of the present invention described with reference to FIG. 3, FIG. 4, FIG. 5, and FIG. A procedure for exchanging information between gateways will be described with reference to a sequence chart.
In the description with reference to the sequence chart, it is shown in FIG. 3, FIG. 4, FIG. 5, and FIG. 6 as to which of the functional units of the mobile terminal device and the base station performs the corresponding operation. Since it is self-evident from the description with reference to the above, description of the operation of each functional unit will be omitted.

In addition, when the base station recognizes a communication method applied by the own station, each unit is naturally set in a state in which communication is performed using the communication method. Refer to each sequence chart below. In the description, mention of this point is omitted.
FIG. 7 is a sequence chart showing an example of the operation of the communication method determination system of FIG.
When a service request is issued from the mobile terminal apparatus to the base station in accordance with the user's operation (step S701), the base station transmits information indicating the content of the service corresponding to this service request (denoted as “request service”) and the user. Information (such as subscriber information related to the mobile terminal device) is sent to the service gateway (step S702).

In response to the information sent in step S702, the service gateway returns information representing the outline of the service used to the base station (step S703).
Based on the information returned in step S703, the base station recognizes the type of service used corresponding to the service request in step S701 (step S704).
The type of service used recognized in step S704 may be a type suitable for using the MIMO scheme, for example.

Next, the base station requests the mobile terminal apparatus to transmit information indicating the reception quality (step S705).
In response to the request in step S705, the mobile terminal apparatus supplies information indicating the reception quality to the base station (step S706).
Based on the information supplied in step S706, the base station recognizes the reception quality at the current time (step S707).
The base station determines the communication method to be applied under the conditions at the current time point based on the information on the type of service used recognized in step S704 and the information on the reception quality at the current time point recognized in step S707 ( Step S708).

In the determination in step S708, for example, a result of applying the MIMO scheme is obtained.
The base station further notifies the mobile terminal apparatus of information indicating the communication method as a result of the determination in step S708 (step S709).
The mobile terminal apparatus that has received the notification in step S709 sets the antenna application method and calculation mode to a mode suitable for the notified communication method (step S710).

FIG. 8 is a sequence chart showing another example of the operation of the communication method determination system of FIG.
When a service request is issued from the mobile terminal device to the base station in accordance with the user's operation (step S801), the base station transmits information indicating the content of the service corresponding to the service request (denoted as “request service”) and the user. Information (subscriber information about the mobile terminal device, etc.) is sent to the service gateway (step S802).
In response to the information sent in step S802, the service gateway returns information representing the outline of the service used to the base station (step S803).

In the case of FIG. 8, unlike the case of FIG. 7, the base station determines the communication method to be applied under the conditions at the current time point based on the information representing the outline of the service used returned in step S803. (Step S804).
The communication method as the determination result in step S804 can be, for example, the MIMO method.
The base station notifies the mobile terminal apparatus of the determination result in step S804 (step S805).
In response to the notification in step S805, the mobile terminal apparatus sets the antenna application method and calculation mode to a mode compatible with the notified communication method (step S806).

When the setting in step S806 is completed, the mobile terminal device issues a communication method setting completion notification to the base station (step S807).
The base station that has received the notification in step S807 requests the mobile terminal apparatus to transmit information indicating the reception quality at the current time point (step S808).
In response to the request in step S808, the mobile terminal apparatus supplies information indicating the reception quality to the base station (step S809).
Based on the information supplied in step S809, the base station recognizes the reception quality at the current time (step S810).

The base station determines a communication method to be applied under the conditions at the current time point based on the information regarding the reception quality at the current time point recognized at step S810 (step S811).
In the determination in step S811, for example, a result of maintaining the MIMO scheme previously set in step S806 is obtained.
The base station further notifies the mobile terminal apparatus of information indicating the communication method as a result determined in step S811 (step S812).

In the mobile terminal apparatus that has received the notification in step S812, the method of applying the antenna and the mode of calculation are set to a mode compatible with the notified communication method (step S813).
For the setting in step S813, if the determination result in step S811 is to maintain the MIMO scheme previously set in step S806, this setting need not be changed. Will keep the settings at.

FIG. 9 is a sequence chart showing an example of the operation of the communication method determination system of FIG.
When a service request is issued from the mobile terminal apparatus to the base station according to the user's operation (step S901), the base station transmits information (denoted as “request service”) indicating the content of the service corresponding to the service request and the user. Information (subscriber information about the mobile terminal device, etc.) is sent to the service gateway (step S902).

In response to the information sent in step S902, the service gateway returns information representing the outline of the service used to the base station (step S903).
The base station recognizes the type of service used corresponding to the service request in step S901 based on the information returned in step S903 (step S904).
The type of service used recognized in step S904 can be, for example, a type suitable for using the MIMO scheme.

Next, the base station requests the mobile terminal apparatus to transmit information indicating the reception quality (step S905).
In response to the request in step S905, the mobile terminal apparatus supplies information indicating the reception quality to the base station (step S906).
Based on the information supplied in step S906, the base station recognizes the reception quality at the current time (step S907).

The base station further recognizes the free capacity of the radio resource at the current time (step S908). The free capacity of this radio resource is represented by a scale that makes it possible to determine whether or not it is possible to apply the MIMO scheme, for example.
Based on the information on the type of service used recognized in step S904, the information on the reception quality at the current time recognized in step S907, and the information on the free capacity of the radio resource recognized in step S908, the base station A communication method to be applied under the current condition is determined (step S909).

In the determination in step S909, for example, a result of applying the MIMO scheme is obtained.
The base station further notifies the mobile terminal device of information representing the communication method as a result determined in step S909 (step S910).
In the mobile terminal apparatus that has received the notification in step S910, the method of applying the antenna and the mode of calculation are set to a mode suitable for the notified communication method (step S911).

FIG. 10 is a sequence chart showing another example of the operation of the communication method determination system of FIG.
When a service request is issued from the mobile terminal apparatus to the base station in accordance with the user's operation (step S1001), the base station transmits information indicating the content of the service corresponding to this service request (denoted as “requested service”) and the user. Information (subscriber information regarding the mobile terminal device, etc.) is sent to the service gateway (step S1002).
In response to the information sent in step S1002, the service gateway returns information representing the outline of the service used to the base station (step S1003).

In the case of FIG. 10, unlike the case of FIG. 9, the base station determines the communication method to be applied under the conditions at the current time point based on the information representing the outline of the service used returned in step S1003. (Step S1004).
The communication method as the determination result in step S1004 can be, for example, the MIMO method.
The base station notifies the mobile terminal apparatus of the determination result in step S1004 (step S1005).
In response to the notification in step S1005, the mobile terminal apparatus sets the antenna application method and the calculation mode to a mode compatible with the notified communication method (step S1006).

When the setting in step S1006 is completed, the mobile terminal device issues a communication method setting completion notification to the base station (step S1007).
The base station that has received the notification in step S1007 requests the mobile terminal apparatus to transmit information indicating the reception quality at the current time point (step S1008).
In response to the request in step S1008, the mobile terminal apparatus supplies information indicating the reception quality to the base station (step S1009).
Based on the information supplied in step S1009, the base station recognizes the reception quality at the current time (step S1010).

The base station further recognizes the free capacity of the radio resource at the current time (step S1011). The free capacity of this radio resource is represented by a scale that makes it possible to determine whether or not it is possible to apply the MIMO scheme, for example.
Based on the information on the type of service used recognized in step S1004, the information on the reception quality at the current time recognized in step S1010, and the information on the free capacity of the radio resource recognized in step S1011, the base station A communication method to be applied under the current condition is determined (step S1012).
In the determination in step S1012, for example, a result of maintaining the MIMO scheme previously set in step S1006 is obtained.

The base station further notifies the mobile terminal device of information indicating the communication method as a result determined in step S1012 (step S1013).
In the mobile terminal apparatus that has received the notification in step S1013, the method of applying the antenna and the mode of calculation are set to a mode suitable for the notified communication method (step S1014).
The setting in step S1014 is not necessary to change this setting if the result determined in step S1012 is to maintain the MIMO scheme previously set in step S1006, for example. The setting in S1006 is maintained.

FIG. 11 is a sequence chart showing an example of the operation of the notification method determination system of FIG.
When a service request is issued from the mobile terminal device to the base station in accordance with the user's operation (step S1101), the base station transmits information indicating the content of the service corresponding to the service request (denoted as “request service”) and the user. Information (subscriber information regarding the mobile terminal device, etc.) is sent to the service gateway (step S1102).

In response to the information sent in step S1102, the service gateway returns information representing the outline of the service used to the base station (step S1103).
The base station transmits information representing the outline of the service used returned in step S1103 to the mobile terminal apparatus (step S1104).
The mobile terminal device recognizes the type of the service used based on the information representing the outline of the service used obtained in step S1104 (step S1105).

The recognition in step S1105 is, for example, to the effect that it is appropriate to apply the MIMO scheme.
The mobile terminal device further measures the reception level at the current time point and recognizes the reception quality from the measurement result (step S1106).
Next, the mobile terminal apparatus determines the communication method to be applied based on the information on the service used recognized in step S1105 and the information on the reception quality recognized in step S1106 (step S1107).

In the determination in step S1107, for example, a result of applying the MIMO scheme is obtained.
The mobile terminal apparatus notifies the base station of the determination result in step S1107 (step S1108).
Further, the mobile terminal apparatus sets the antenna application method and the calculation mode to a mode suitable for the communication method determined in step S1107 (step S1109).
If it is determined in step S1107 that the non-MIMO method is applied, the notification in step S1108 and the setting in step S1109 are also executed for the purpose of applying the non-MIMO method. Of course.

FIG. 12 is a sequence chart showing another example of the operation of the notification method determination system of FIG.
When a service request is issued from the mobile terminal apparatus to the base station according to the user's operation (step S1201), the base station transmits information (denoted as “request service”) indicating the content of the service corresponding to the service request and the user. Information (subscriber information on the mobile terminal device, etc.) is sent to the service gateway (step S1202).
In response to the information sent in step S1202, the service gateway returns information representing the outline of the service used to the base station (step S1203).

The base station transmits information representing the outline of the service used returned in step S1203 to the mobile terminal apparatus (step S1204).
In the case of FIG. 12, unlike the case of FIG. 11, the mobile terminal apparatus recognizes the type of the service used based on the information representing the outline of the service used received in step S1204 (step S1205).
Next, based on the recognition in step S1205, the mobile terminal apparatus determines a communication method to be applied under the recognition (step S1206).
In the determination in step S1206, for example, a result of applying the MIMO scheme is obtained.
The base station notifies the mobile terminal apparatus of the determination result in step S1206 (step S1207).

In accordance with the determination result in step S1206, the mobile terminal apparatus sets an antenna application method and a calculation mode to a mode compatible with the notified communication method (step S1208).
When the setting in step S1208 is completed, the mobile terminal apparatus further measures the reception level at the current time point and recognizes the reception quality from the measurement result (step S1209).
Next, the mobile terminal apparatus determines a communication method to be applied at the current time point based on the reception quality information recognized in step S1209 (step S1210).

In the determination in step S1210, for example, a result of applying the MIMO scheme is obtained.
The mobile terminal apparatus notifies the base station of the determination result in step S1210 (step S1211).
Further, the mobile terminal apparatus sets the antenna application method and the calculation mode to a mode suitable for the communication method determined in step S1211 (step S1212).

The setting in step S1212 is not necessary to change this setting if the determination result in step S1210 is to maintain the MIMO scheme previously set in step S1208. Will keep the settings at.
If the determination in step S1206 and step S1210 shows that the non-MIMO method is applied, the notification in step S1207 and the setting in step S1208 are also executed for the purpose of applying the non-MIMO method. Of course.

FIG. 13 is a sequence chart showing an example of the operation of the notification method determination system of FIG.
When a service request is issued from the mobile terminal device to the base station in accordance with the user's operation (step S1301), the base station transmits information indicating the content of the service corresponding to this service request (denoted as “request service”) and the user. Information (subscriber information on the mobile terminal device, etc.) is sent to the service gateway (step S1302).

In response to the information sent in step S1302, the service gateway returns information representing the outline of the service used to the base station (step S1303).
The base station transmits information representing the outline of the service used returned in step S1303 to the mobile terminal apparatus (step S1304).
The mobile terminal device recognizes the type of the service used based on the information representing the outline of the service used obtained in step S1304 (step S1305).

The recognition in step S1305 is, for example, intended to apply the MIMO scheme.
The mobile terminal apparatus further measures the reception level at the current time point and recognizes the reception quality from the measurement result (step S1306).
Next, the mobile terminal apparatus requests information on the free capacity of the radio resource from the base station (step S1307).
In response to the request in step S1307, the base station detects and acquires information on the free capacity of the radio resource at the current time (step S1308).

The free capacity of the radio resource in step S1308 is represented by a scale that enables determination as to whether or not the MIMO scheme can be applied, for example.
The base station transmits information representing the free capacity of the radio resource acquired in step S1308 to the mobile terminal apparatus (step S1309).
Based on the information received in step S1309, the mobile terminal apparatus recognizes the free capacity of the radio resource at the current time (step S1310).

The mobile terminal apparatus applies the information based on the service information recognized in step S1305, the reception quality information recognized in step S1306, and the free space information of the radio resource recognized in step S1310. The communication method to be determined is determined (step S1311).
In the determination of step S1311, for example, a result of applying the MIMO scheme is obtained.

The mobile terminal apparatus notifies the base station of the determination result in step S1311 (step S1312).
Further, the mobile terminal device sets the antenna application method and the calculation mode to a mode suitable for the communication method determined in step S1310 (step S1313).
Note that, in the determination in step S1311, for example, when the result of applying the non-MIMO method is obtained, the notification in step S1312, and the setting in step S1313 are also executed with the intention of applying the non-MIMO method. Of course.

FIG. 14 is a sequence chart showing another example of the operation of the notification method determination system of FIG.
When a service request is issued from the mobile terminal apparatus to the base station according to the user's operation (step S1401), the base station transmits information indicating the content of the service corresponding to this service request (denoted as “request service”) and the user. Information (subscriber information regarding the mobile terminal device, etc.) is sent to the service gateway (step S1402).

In response to the information sent in step S1402, the service gateway returns information representing the outline of the service used to the base station (step S1404).
The base station recognizes the type of use service based on the information representing the outline of the use service returned in step S1404 (step S1405).
In the mobile terminal device, the communication method to be applied is determined based on the recognition regarding the service type used in step S1405 (step S1406).

In the determination in step S1406, for example, a result of applying the MIMO scheme is obtained.
The mobile terminal apparatus notifies the base station of the determination result in step S1406 (step S1407), and sets the manner of antenna application and the mode suitable for the communication method according to the determination result in step S1406. (Step S1408).
The mobile terminal device further measures the reception level at the current time point and recognizes the reception quality from this measurement result (step S1409).
Next, the mobile terminal apparatus requests information on the free capacity of radio resources from the base station (step S1410).

In response to the request in step S1410, the base station detects and acquires the free capacity of the radio resource at the current time (step S1411).
The free space of the radio resource in step S1411 is represented by a scale that enables determination as to whether or not the MIMO system can be applied, for example.
The base station transmits information indicating the free capacity of the radio resource acquired in step S1411 to the mobile terminal apparatus (step S1412).
The mobile terminal apparatus recognizes the free capacity of the radio resource at the current time point based on the information received in step S1412 (step S1413).

The mobile terminal apparatus determines a communication method to be applied based on the reception quality information recognized in step S1409 and the radio resource free capacity information recognized in step S1413 (step S1414).
In the determination in step S1414, for example, a result of applying the MIMO scheme is obtained.
The mobile terminal apparatus notifies the base station of the determination result in step S1414 (step S1415).

Furthermore, the mobile terminal apparatus sets the antenna application method and the calculation mode to a mode suitable for the communication method determined in step S1414 (step S1416).
Note that, in the determinations in step S1406 and step S1414, for example, when the result of applying the non-MIMO method is obtained, the notification in step S1407 and step S1415 and the setting in step S1416 are also non- Of course, it is executed for the purpose of applying the MIMO method.

FIG. 15 is a diagram exemplifying the relationship between the condition relating to the communication method determination and the determination result in the systems of FIGS. 1 to 6.
In FIG. 15, “reception quality” is the reception quality recognized based on the measurement value of the reception level as described above in the mobile terminal apparatus.
In addition, “utilization service” is classified into four types of hierarchies according to whether or not the MIMO scheme can be applied according to the amount of data to be transmitted and the required quality of service (QoS).
Here, whether the data amount is “large data” or “small data” is classified as follows, for example.
That is, paying attention to the amount of data that can be transmitted, the size is classified according to whether or not the value exceeds a certain threshold. This threshold is defined by the communication system and the carrier.

For example, assuming that the maximum speed of the downlink channel of the current HSDPA (High Speed Downlink Packet Access) system is 3.6 Mbps, and 10 users use this downlink channel, the data amount of 360 kbp per user per second Reception is possible.
In consideration of the overall radio resources, the amount of 2.1Mb data that can be downloaded in 5 seconds is considered to be one of the limits of the system. In this case, 2.1Mb is the threshold value related to the above-mentioned classification of data amount. .

On the other hand, regarding the high and low classification of QoS, for example, it is possible to set a threshold for any of the QCIs that are QoS class indicators in FIG.
FIG. 16 is a diagram for more specifically explaining the condition relating to the service quality shown in FIG.
QoS is divided into a plurality of classes with respect to quality of service, and high and low threshold values for QoS can be set by these QoS class indicators (QoS Class Identifier: QCI).

The data shown in FIG. 16 is based on the data published as Table B-1 in the 3GPP specification TS 23.401. QoS class indicators, their characteristics, and examples of services Is shown.
Of these QoS class indicators, for example, QoS class 5 (IMS Signaling) may be classified as a threshold related to the above-described high / low classification, and a QCI range of 1 to 4 may be classified as QoS high and a range of 5 to 8 as QoS low. it can.

The communication method to be applied is determined based on these “reception quality” and “usage service”. As indicated by “Δ” in FIG. 15, the free capacity of radio resources for communication is determined. As another parameter, the communication method to be applied can be determined.
As can be seen from FIG. 15, very generally, the MIMO scheme is applied when the reception quality is good and the amount of data to be transmitted is large, on the contrary, the reception quality is poor, and There is a tendency that the non-MIMO method is applied when the amount of data to be transmitted is small.

FIG. 17 is a flowchart illustrating the relationship between the reception quality and the determination result regarding the communication method determination in the systems of FIGS. 1 to 6.
In addition, as an “index” as an index of reception quality in the following description, for example:
SNR (Signal-to-Noise Ratio);
SINR (Signal-to-Interference. And Noise Power Ratio);
CQI (Channel Quality Indicator)
Etc. are applicable.

As for these indexes, the larger the value, the better the reception quality.
When communication is started, first, index calculation processing is executed (step S1701).
Next, the value calculated in step S1701 is stored (step S1702).
Further, a moving average for each predetermined section (period) is calculated for the index stored in S1702 (step S1703).
The moving average value calculated in step S1703 is compared with a predetermined threshold value (step S1704).

If it is determined in step S1704 that the moving average value is greater than the predetermined threshold (step S1704: Yes), the base station is notified that the reception quality is good (step S1705).
On the other hand, if it is determined in step S1704 that the moving average value is equal to or less than the predetermined threshold (step S1704: No), the base station is notified that the reception quality is poor (step S1706).

  After the notification in step S1705 and step S1706, it is monitored whether or not the communication is completed (step S1707), and the process from step S1701 to step SS1705 (step S1706) is repeated until the communication end is not recognized (step S1707: No). When the communication end is recognized (step S1707: Yes), the process is terminated.

FIG. 18 is a diagram exemplifying the relationship between the transition with time of the moving average of the reception quality related to the communication method determination in the systems of FIGS.
In FIG. 18, the vertical axis represents the received SNR value as the “index” in FIG. 17, and the horizontal axis represents time.
In a period in which the average SNR of the moving average period Δt ₁ is larger than the predetermined threshold SNR _th, it is determined that the MIMO scheme is suitable.
On the other hand, in a period in which the propagation environment deteriorates and the average SNR of the moving average period Δt ₂ is smaller than the predetermined threshold SNR _th , the MIMO scheme is determined to be incompatible, and a non-MIMO scheme such as the SISO scheme is applied.

Further, when the communication environment is restored and the average SNR of the moving average period Δt ₃ becomes larger than the predetermined threshold SNR _th while communication in the SISO method (non-MIMO method) is continued, the SISO method (non-MIMO method) Switch from MIMO method) to MIMO method.
As described above, according to the present invention, the MIMO scheme can be accurately applied when communication based on the MIMO scheme is superior to other schemes depending on conditions such as the use service and reception quality (propagation environment). Compared with a conventional communication system that always applies the MIMO scheme, it is possible to obtain characteristics with high throughput.

  INDUSTRIAL APPLICABILITY The present invention is used to realize a practical communication method determination method and communication method determination system that can be selectively applied by appropriately switching between a MIMO method and a non-MIMO method according to various conditions in an actual communication service. be able to.

It is a conceptual diagram showing the outline | summary of the system with which the communication system determination method of this invention is implemented. It is a conceptual diagram showing the one aspect | mode of the system of FIG. It is a functional block diagram showing 1st Embodiment of the communication system determination system of this invention. It is a functional block diagram showing 2nd Embodiment of the communication system determination system of this invention. It is a functional block diagram showing 3rd Embodiment of the communication system determination system of this invention. It is a functional block diagram showing 4th Embodiment of the communication system determination system of this invention. It is a sequence chart showing an example of operation | movement of the system of FIG. It is a sequence chart showing the other example of operation | movement of the system of FIG. It is a sequence chart showing an example of operation | movement of the system of FIG. It is a sequence chart showing the other example of operation | movement of the system of FIG. It is a sequence chart showing an example of operation | movement of the system of FIG. It is a sequence chart showing the other example of operation | movement of the system of FIG. It is a sequence chart showing an example of operation | movement of the system of FIG. It is a sequence chart showing the other example of operation | movement of the system of FIG. It is a figure which illustrates the relationship between the conditions regarding the communication system determination in the system of FIG. 1 thru | or 6, and a determination result. FIG. 16 is a diagram illustrating more specifically the conditions described in FIG. 15. It is a flowchart which illustrates the relationship between the reception quality regarding the communication system determination in the system of FIG. 1 thru | or 6, and a determination result. FIG. 7 is a diagram exemplifying a relationship between a transition over time of a moving average of reception quality related to communication method determination in the system of FIGS. 1 to 6 and a determination result.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 ... Communication system determination system 11 ... Use service recognition part 12 ... Reception quality recognition part 13 ... Communication system determination part 14 ... Radio | wireless resource free capacity recognition part 20 ... Communication system determination system 21 ... Mobile terminal device 22 ... Base station 23 ... Service Gateway 24 ... Internet 25 ... Destination sites / servers 300, 400, 500, 600 ... Communication method determination systems 310, 410, 510, 610 ... Mobile terminal devices 311, 411, 511, 611 ... Antennas 312, 412, 512, 612 ... Antenna circuits 313, 413, 513, 613 ... Transmission / reception parts 314, 414, 514, 614 ... Reception level measurement parts 315, 415, 515, 615 ... Control parts 316, 416, 516, 616 ... Operation parts 317, 417, 520 , 620... Communication method setting unit 350, 450, 550, 6 0 ... base stations 351, 451, 551, 651 ... wireless communication units 351a, 451a, 551a, 651a ... antennas 352, 452, 552, 652 ... service request accepting units 353, 453, 553, 653 ... service / user information obtaining units 354, 454... Used service recognition unit 355, 455 ... reception quality information acquisition unit 356, 456 ... reception quality recognition unit 357, 457, 557, 657 ... control unit 358, 458, 519, 619 ... communication system determination unit 459, 621 ... Wireless resource free space recognition unit 655 ... Wireless resource free space information acquisition unit

Claims (5)

Determination for selectively applying one communication method among a plurality of communication methods including a MIMO (Multi-Input Multi-Output) method and a non-MIMO method not depending on the MIMO method for communication between predetermined nodes. A communication method determination method to be performed,
In response to a service request issued between the nodes, information indicating the contents of the service and subscriber information regarding the mobile terminal device are sent to the service gateway, and based on the information indicating the outline of the used service returned from the service gateway. A service recognition step for recognizing the type of service used corresponding to the service request in communication between the nodes;
A reception quality recognition step for recognizing reception quality in communication between the nodes;
Whether a MIMO scheme or a non-MIMO scheme is applied to communication between the nodes according to the type of service used recognized in the service recognition step and the reception quality recognized in the reception quality recognition step A communication method determination step for determining
Only contains the type of usage services, whether the application of MIMO scheme by a service quality required and the amount of data to be transmitted (QoS) are classified into a plurality of types of hierarchy in the communication system determination step, A communication system determination characterized by determining whether or not to apply a MIMO system to communication between nodes according to whether a required service quality (QoS) is higher or lower than a threshold based on QCI that is a class index of service quality Method. A wireless resource free space recognition step for recognizing the free space of the wireless resource at the current time in communication between the nodes,
The communication method determining step includes a type of service used recognized in the service usage recognition step, a reception quality recognized in the reception quality recognition step, and a radio resource free space recognized in the radio resource free capacity recognition step. The communication method determination method according to claim 1, wherein a communication method of a MIMO method or a non-MIMO method is applied to communication between the nodes according to a capacity.   2. The communication system determination method according to claim 1, wherein the non-MIMO system is any one of a SISO (Single-Input Single-Output) system, a reception diversity system, a transmission diversity system, and an adaptive array antenna system. . A communication method for selectively applying one communication method among a plurality of communication methods including a MIMO (Multi-Input Multi-Output) method and a non-MIMO method not depending on the MIMO method for communication between predetermined nodes A determination system,
In response to a service request issued between the nodes, information indicating the contents of the service and subscriber information regarding the mobile terminal device are sent to the service gateway, and based on the information indicating the outline of the used service returned from the service gateway. , used service recognition unit provided to one of the nodes to recognize the type of the usage service corresponding to the service request in the communication and between the node,
A reception quality recognition unit provided in any of the nodes so as to recognize the reception quality in communication between the nodes;
Whether a MIMO scheme or a non-MIMO scheme is applied to communication between the nodes according to the type of service used recognized by the service recognition unit and the reception quality recognized by the reception quality recognition unit A communication method determination unit provided in any of the nodes so as to determine
Only contains the type of usage services, whether the application of MIMO scheme by a service quality required and the amount of data to be transmitted (QoS) are classified into a plurality of types of layers, the communication system determination unit obtains Communication system determination system for determining whether or not to apply the MIMO system to communication between the nodes depending on whether the quality of service (QoS) is higher or lower than a threshold based on QCI that is a class index of service quality . A wireless resource free space recognition unit provided in any of the nodes so as to recognize and recognize the free space of the wireless resource at the current time in communication between the nodes;
The communication method determination unit includes: a type of service used recognized by the service recognition unit; a reception quality recognized by the reception quality recognition unit; and a radio resource vacancy recognized by the radio resource free capacity recognition unit. 5. The communication system determination system according to claim 4, wherein a communication system of a MIMO system or a non-MIMO system is applied to communication between the nodes according to capacity.

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