JP2009246476A - Radio communication system and radio communication control method - Google Patents

Abstract

In a wireless communication system in which a multi-mode wireless communication device and a single-mode wireless communication device can coexist, adjustment of the wireless communication method for the multi-mode wireless communication device is performed to effectively use the system.
A wireless communication system capable of mixing a multi-mode wireless communication device capable of changing a communication mode representing a type of wireless communication method and an operation mode of the wireless communication method and a single-mode wireless communication device unable to change the communication mode. , Each wireless communication device is provided with a control manager that operates in coordination to adjust the communication mode between the wireless communication devices based on the communication capacity of the wireless communication system.
[Selection] Figure 1

Description

  The present invention relates to a wireless communication system and a wireless communication control method.

  In recent years, a wireless communication apparatus that realizes a plurality of types of wireless communication schemes using software defined radio (SDR) technology has been studied. According to the SDR technology, it is possible to realize a multimode terminal capable of selectively using a plurality of types of wireless communication methods at low cost. As a result, not only wireless base stations but also mobile stations have become realistic wireless communication systems that can use different wireless communication methods depending on the situation.

In the prior art described in Patent Document 1, a service for a single mode terminal is provided in an environment in which a multimode terminal that can use a plurality of types of wireless communication methods and a single mode terminal that can use only a single wireless communication method are mixed. In order to mitigate the degradation of quality, when the multi-mode terminal performs inter-system handover, the inter-system handover is performed according to the "channel margin" calculated in consideration of the free channel information and traffic volume in the destination system. Judgment is made.
JP 2002-77965 A

  However, with the above-described conventional technology, it is possible to perform load adjustment between systems at the time of inter-system handover of a multimode terminal, but it is not possible to appropriately cope with other situations. For example, in a situation where a multimode terminal and a single mode terminal can access a certain radio base station at the same time, when the single mode terminal accesses, it is necessary to accept the access because the radio communication method cannot be changed. As a result, if the communication capacity becomes tight due to the acceptance of the access of the single mode terminal, the throughput of each terminal may decrease.

  The present invention has been made in consideration of such circumstances, and its object is directed to a multimode wireless communication apparatus in a wireless communication system in which a multimode wireless communication apparatus and a single mode wireless communication apparatus can be mixed. An object of the present invention is to provide a wireless communication system and a wireless communication control method capable of effectively using the system by adjusting the wireless communication system.

  In order to solve the above problems, a wireless communication system according to the present invention includes a multi-mode wireless communication apparatus capable of changing a communication mode representing a type of a wireless communication system and an operation mode of the wireless communication system, and the communication mode is not changed. In a wireless communication system in which possible single-mode wireless communication devices can be mixed, a control manager that operates in cooperation to adjust the communication mode between wireless communication devices based on the communication capacity of the wireless communication system It is provided in the apparatus.

  In the wireless communication system according to the present invention, the control manager consults the multimode wireless communication apparatus for a change in the communication mode based on a communication capacity of the wireless communication system.

  In the wireless communication system according to the present invention, the control manager, based on a connection request from a single mode wireless communication apparatus, communication capacity calculating means for calculating the communication capacity of the wireless communication system, and based on the calculation result And an inquiry means for consulting the multimode wireless communication apparatus for a change in communication mode, and a connection control means for responding to the connection request based on the inquiry result.

  In the wireless communication system according to the present invention, the control manager calculates a communication load for the multi-mode wireless communication apparatus based on the communication result calculation means for periodically calculating the communication load of the wireless communication system. And an inquiry means for consulting the change.

  In the wireless communication system according to the present invention, the inquiry means determines communication mode change consultation contents based on the inclusion relationship between the upstream and downstream communication capacities of the relay station.

  In the wireless communication system according to the present invention, there is provided means for recording a use record of a wireless communication method related to a multi-mode wireless communication apparatus, and the inquiry means determines communication mode change consultation contents based on the use record. It is characterized by that.

  In the wireless communication system according to the present invention, the inquiry means consults a decrease in communication speed based on a record of communication data amount.

  In the radio | wireless communications system which concerns on this invention, the said control manager was provided in the multi-mode radio | wireless base station, The radio | wireless communications system of any one of Claim 2 to 7 characterized by the above-mentioned.

  The wireless communication control method according to the present invention includes a multi-mode wireless communication apparatus capable of changing a communication mode representing a type of wireless communication system and an operation mode of the wireless communication system, and a single-mode wireless communication apparatus unable to change the communication mode. A wireless communication control method in a wireless communication system capable of mixing, wherein each wireless communication device has a control manager, and the control managers communicate with each other in a communication mode between wireless communication devices based on a communication capacity of the wireless communication system. It is characterized by operating cooperatively to make adjustments.

  The radio communication control method according to the present invention is characterized in that the control manager consults the multimode radio communication device about the change of the communication mode based on the communication capacity of the radio communication system.

  In the wireless communication control method according to the present invention, the control manager calculates a communication capacity of the wireless communication system based on a connection request from a single mode wireless communication device, and the control manager includes: An inquiry step for consulting the multimode wireless communication apparatus for a change in communication mode based on the calculation result, and a connection control step for responding to the connection request by the control manager based on the inquiry result. It is characterized by.

  In the wireless communication control method according to the present invention, the control manager periodically calculates a communication load of the wireless communication system, and the control manager performs multimode wireless communication based on the calculation result. And an inquiry step for consulting the communication device to change the communication mode.

  The wireless communication control method according to the present invention is characterized in that, in the inquiry step, the communication mode change consultation contents are determined based on the inclusion relationship between the upstream and downstream communication capacities of the relay station.

  In the wireless communication control method according to the present invention, the usage record of the wireless communication method according to the multi-mode wireless communication apparatus is recorded, and the inquiry mode change consultation content is determined based on the usage record in the inquiry step. Features.

  The wireless communication control method according to the present invention is characterized in that, in the inquiry step, a decrease in communication speed is consulted based on the actual amount of communication data.

  According to the present invention, in a wireless communication system in which a multi-mode wireless communication device and a single-mode wireless communication device can be mixed, by effectively adjusting the wireless communication scheme for the multi-mode wireless communication device, the system can be effectively used. The effect that it can aim at is acquired.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings.

  First, a multimode wireless communication apparatus and a single mode wireless communication apparatus according to the present invention will be defined. The multi-mode wireless communication device can change the communication mode. The single mode wireless communication device cannot change the communication mode. The communication mode represents the type of wireless communication system and the operation mode of the wireless communication system. Changing the communication mode includes both changing the type of the wireless communication system and changing the operation mode in the same type of wireless communication system. Different types of wireless communication systems are not compatible and cannot communicate. The same type of wireless communication system and different operation modes may be limited in performance, but they are compatible and can communicate. Examples of the operation mode include a mode with different communication speeds and a mode with different guaranteeable quality of service (QoS).

  Examples of the multi-mode wireless communication device include a device that realizes a plurality of types of wireless communication schemes by SDR technology and a device that includes a plurality of types of wireless communication scheme wireless modules. In the present embodiment, a wireless communication device to which the SDR technology is applied will be described as an example of the multimode wireless communication device. By applying SDR technology, in addition to changing the type of wireless communication system (for example, PDC (Personal Digital Cellular), GSM (Global System for Mobile Communications), etc.), the operation mode of the wireless communication system can be changed flexibly. Can be done. For example, the wireless communication method can be changed in units of a plurality of operation modes in which detailed parameter adjustment is performed in the same type of wireless communication method. Specific examples include “CDMA2000 1xEV-DO” in which the maximum DRC rate is limited to each value in order to realize communication that is difficult to cut at a low speed. Thereby, it becomes possible to respond very flexibly to a request from the user.

  The multi-mode wireless communication device can be applied to either a wireless base station or a mobile station. In the present embodiment, the multimode wireless communication apparatus is applied to both the wireless base station and the mobile station. In addition, as for a mobile station, there are one to which a multi-mode wireless communication device is applied and one to which a single-mode wireless communication device is applied.

  FIG. 1 is a conceptual diagram showing a configuration of a wireless communication system according to an embodiment of the present invention. In FIG. 1, a radio base station 100 is composed of a multimode radio communication device. The mobile station 200 includes a multi-mode wireless communication device (hereinafter referred to as multi-mode mobile station 200) and a single-mode wireless communication device (hereinafter referred to as single-mode mobile station 200). And both. The radio base station 100 can perform radio communication with both the multimode mobile station 200 and the single mode mobile station 200. Hereinafter, when the single-mode mobile station 200 and the multi-mode mobile station 200 are not particularly distinguished from each other, they are simply referred to as “mobile station 200”. Note that the radio base station 100 has only a multimode.

  Each of the radio base station 100 and the mobile station 200 has a control manager. The control manager has a function of controlling operations related to wireless communication. The control manager of the radio base station 100 and the control manager of the mobile station 200 exchange data with each other through radio communication between the radio base station 100 and the mobile station 200. Thereby, the control manager of the radio base station 100 and the control manager of the mobile station 200 can transmit information to each other and perform coordinated operations.

  FIG. 2 is a block diagram showing a configuration of the radio base station 100 according to the present embodiment. FIG. 3 is a block diagram showing a configuration of the multimode mobile station 200 according to the present embodiment. The radio base station 100 and the multimode mobile station 200 are configured to realize a plurality of types of radio communication schemes by SDR technology.

First, the radio base station 100 will be described with reference to FIG.
In FIG. 2, the radio base station 100 includes a radio interface unit 11, a control manager 12, a communication mode management unit 13, and a connected mobile station profile storage unit 14.

  The wireless interface unit 11 includes a signal processing device that can execute software that realizes a function of a wireless communication method. When the signal processing device executes software, the wireless interface unit 11 has a function of a wireless communication method realized by the software. Examples of the signal processing device included in the wireless interface unit 11 include an arithmetic processing device (for example, a DSP (digital signal processor)) that performs arithmetic operations according to software, and a hardware device (for example, PLD) that can redefine a circuit configuration according to software. (Programmable logic device) and the like. The wireless interface unit 11 can operate a plurality of wireless communication systems at the same time by including a plurality of signal processing devices.

  The control manager 12 controls operations related to wireless communication. The control manager 12 performs an operation in cooperation with the control manager of the mobile station 200 as necessary.

  The communication mode management unit 13 stores and manages software provided to the wireless interface unit 11. The control manager 12 reads out software corresponding to the wireless communication method operated by the wireless interface unit 11 from the communication mode management unit 13 and supplies the software to the wireless interface unit 11.

  The connected mobile station profile storage unit 14 stores the connected mobile station profile. The connected mobile station profile is data in which the usage record of the wireless communication method related to the mobile station 200 connected to the wireless base station 100 is recorded. The control manager 12 creates a connected mobile station profile for each mobile station 200 connected to the radio base station 100. Further, the control manager 12 refers to the connected mobile station profile in the connected mobile station profile storage unit 14 as necessary.

  FIG. 4 is a configuration example of the connected mobile station profile storage unit 14 according to the present embodiment. In FIG. 4, the connected mobile station profile of each mobile station 200 includes information such as mobile station identification information (mobile station ID), type of multimode / single mode, communication mode, last use time, total communication amount, and total use time. Have The connected mobile station profile has a communication mode usage history (including information currently in use) for each mobile station ID. As a result, it is possible to know which mobile station 200 has used which communication mode, and finally when, how much communication is used by the total, and how much time is used by the total. The communication mode represents the type and operation mode of the wireless communication scheme used by the mobile station 200.

Next, the multi-mode mobile station 200 will be described with reference to FIG.
In FIG. 3, the multimode mobile station 200 includes a radio interface unit 21, a control manager 22, a communication mode management unit 23, and a higher-level application unit 24. The wireless interface unit 21 and the communication mode management unit 23 are the same as the wireless interface unit 11 and the communication mode management unit 13 shown in FIG.

  The control manager 22 controls operations related to wireless communication. The control manager 22 performs an operation in cooperation with the control manager 12 of the radio base station 100 as necessary.

  The control manager 12 reads out software corresponding to the wireless communication method operated by the wireless interface unit 21 from the communication mode management unit 23 and supplies the software to the wireless interface unit 21. The control manager 22 selects a wireless communication method to be operated by the wireless interface unit 21 in response to a request from the upper application unit 24.

  Next, operations performed in cooperation by the control manager of the radio base station 100 and the control manager of the mobile station 200 according to the present embodiment will be described with some examples.

FIG. 5 is a sequence diagram showing the procedure of the first embodiment of the cooperative operation performed by the control manager according to the present invention.
In the embodiment of FIG. 5, when a certain multi-mode mobile station 200 is connected to the radio base station 100 in the communication mode 1, a certain single-mode mobile station 200 requests the radio base station 100 to connect in the communication mode 1. This is the case.

  First, in step S1, the control manager 22 (hereinafter referred to as an SM mobile station control manager) of the single mode mobile station 200 controls the control manager 12 (hereinafter referred to as a radio base station control manager) of the radio base station 100. Request connection in communication mode 1.

  In step S2, the radio base station control manager calculates the communication capacity of the communication mode 1 in response to the connection request. The radio base station control manager determines whether or not the connection request can be accepted based on the communication capacity of the calculation result. As this criterion, for example, the number of mobile stations 200 to which the radio base station 100 can be connected simultaneously can be used. For example, the number of mobile stations for the determination may be a fixed value determined as the specification of the wireless communication system, or a value corresponding to the communication mode.

  Examples of the number of mobile stations corresponding to the communication mode include a value determined based on the maximum throughput value of the communication mode. More specifically, for example, in the case of a communication mode using a wireless communication system compliant with IEEE (Institute of Electrical and Electronic Engineers) wireless LAN standard “IEEE802.11a”, the maximum throughput value is 54 Mbits per second. However, the maximum throughput value is shared by the connected mobile stations 200. Here, by setting the minimum guaranteed rate per mobile station in the communication mode, it is possible to determine the maximum number of mobile stations 200 that can be connected simultaneously.

  In step S3, when the radio base station control manager determines that the connection request cannot be accepted because the communication capacity of communication mode 1 is tight as a result of step S2, the multi-mode movement being connected in communication mode 1 is performed. The control manager 22 of the station 200 (hereinafter referred to as the MM mobile station control manager) is consulted to change the communication mode. At this time, it is preferable that the radio base station control manager notifies the MM mobile station control manager of a communication mode having a sufficient communication capacity as a change destination candidate.

  In step S4, the MM mobile station control manager examines the communication mode change in response to the communication mode change consultation. The MM mobile station control manager determines whether or not the communication mode can be changed based on information such as an application currently being executed and the usage status of radio resources so far.

  In step S5, the MM mobile station control manager responds to the radio base station control manager as accepting the communication mode change as a result of step S4. In this example, even if the mode is changed to the communication mode 2, it is determined that the current QoS is satisfied, and the change of the communication mode is accepted.

  In step S6, the radio base station control manager responds to the SM mobile station control manager with connection permission in the communication mode 1 in response to the communication mode change acceptance response from the MM mobile station control manager. When the radio base station control manager receives a communication mode change rejection response from the MM mobile station control manager, the radio base station control manager makes a similar consultation to other MM mobile station control managers connected in communication mode 1. Do.

  In step S7, the SM mobile station control manager connects to the radio base station 100 in the communication mode 1 in response to a connection permission response from the radio base station control manager.

  In step S8, the MM mobile station control manager requests the radio base station control manager to connect to the radio base station 100 in the communication mode 2. In step S9, the radio base station control manager calculates the communication capacity of the communication mode 2 in response to the connection request. The radio base station control manager determines whether or not the connection request can be accepted based on the communication capacity of the calculation result.

  In step S10, when the radio base station control manager determines that the connection request can be accepted because there is no problem in the communication capacity of communication mode 2 as a result of step S9, the communication mode 2 is transmitted to the MM mobile station control manager. Responds to connection permission at.

  In step S11, the MM mobile station control manager connects to the radio base station 100 in the communication mode 2 in response to a connection permission response from the radio base station control manager.

  According to the first embodiment, the radio base station control manager preferentially sends the single mode mobile station 200 to the radio base station 100 in the communication mode requested by the single mode mobile station 200 whose communication mode cannot be changed. Wireless communication control is performed so as to connect. At this time, when the communication capacity of the requested communication mode becomes tight by accepting the connection of the single mode mobile station 200, the change of the communication mode is consulted to the MM mobile station control manager connected in the communication mode. To adjust the wireless communication method. As a result, it is possible to effectively use the radio communication system utilizing the degree of freedom of the radio communication scheme of the multi-mode mobile station 200.

  Note that the multi-mode mobile station 200 may voluntarily request the radio base station 100 to change the communication mode when a desired communication speed cannot be obtained.

FIG. 6 is a sequence diagram showing the procedure of the second embodiment of the cooperative operation performed by the control manager according to the present invention.
In the embodiment of FIG. 6, the radio base station 100 has four communication modes 1, 2, 3, and 4 from six mobile stations # 1, # 2, # 3, # 4, # 5, and # 6. Each is connected in one of the communication modes. The radio base station control manager has an inter-mode load distribution timer that fires periodically. The inter-mode load balancing timer times out at a fixed time and restarts autonomously at the same time as the timeout.

  First, in step S21, the radio base station control manager starts the inter-communication mode load adjustment processing by the firing of the inter-mode load distribution timer.

  In step S22, the radio base station control manager calculates the load of each communication mode 1 to 4. As the load of the communication mode, for example, the total of the total communication amount related to the currently connected mobile station 200, the number of the currently connected mobile stations 200, the total of the total communication amount and the total number of mobile stations, etc. Can be mentioned. These loads can be calculated based on the connected mobile station profile in the connected mobile station profile storage unit 14.

  Then, the radio base station control manager determines a communication mode in which an excessive load is applied based on the load size of each of the communication modes 1 to 4. As a result, when there is a communication mode in which an excessive load is applied, an attempt is made to adjust the load between the communication modes.

  Specifically, a communication mode change is consulted with respect to the multi-mode mobile station 200 that has been used in the communication mode in which an excessive load is applied and has the smallest actual use of the communication mode. To do. In the example of FIG. 6, it is determined that the communication mode 1 and the communication mode 2 are overloaded. Further, the multimode mobile station # 1 connected in the communication mode 1 has the minimum total use time in the communication mode 1, and the multimode mobile station # 4 connected in the communication mode 2 has the total use time in the communication mode 2. Is the smallest. Instead of the total usage time, the multimode mobile station 200 having the smallest total communication volume may be consulted to change the communication mode. Alternatively, the communication mode change may be consulted with respect to the multi-mode mobile station 200 that has the minimum usage record, based on the total usage time and the total communication amount.

  In step S23, the radio base station control manager requests the MM mobile station control manager of the multimode mobile station # 1 connected in the communication mode 1 to change the communication mode as a result of step S22. In step S24, the MM mobile station control manager of multimode mobile station # 1 responds to the communication mode change request. In the example of FIG. 6, the communication mode 3 can be changed, and the communication mode change request is accepted. Thereby, in step S25, the multimode mobile station # 1 changes to the communication mode 3 and connects to the radio base station 100.

  In step S26, the radio base station control manager requests the MM mobile station control manager of the multimode mobile station # 4 connected in the communication mode 2 to change the communication mode as a result of step S22. In step S27, the MM mobile station control manager of multimode mobile station # 4 responds to the communication mode change request. In the example of FIG. 6, the communication mode 4 can be changed, and the communication mode change request is accepted. Thereby, in step S28, the multi-mode mobile station # 4 connects to the radio base station 100 in the communication mode 4.

  In step S29, the radio base station control manager updates the corresponding connected mobile station profile in the connected mobile station profile storage unit 14 based on the change contents of the communication mode. Thereafter, the radio base station control manager starts the inter-communication mode load adjustment processing by the next inter-mode load distribution timer firing (step S30), and again considers the inter-communication mode load adjustment (step S31).

  FIG. 7 is an example of the procedure of the inter-communication mode load adjustment process of the radio base station control manager according to the second embodiment. In the inter-communication mode load adjustment processing of FIG. 7, steps S31 to S33 are repeated for all communication modes. In step S31, the number of mobile stations 200 connected to the target communication mode (number of connections) is calculated. In step S32, the calculated number of connections is compared with a predetermined threshold value. As a result, if the number of connections exceeds the threshold value, the process proceeds to step S33, a communication mode change request destination is determined from among the multimode mobile stations 200 connected to the target communication mode, and a communication mode change is consulted. Then, it returns to step S31. On the other hand, if the number of connections is equal to or smaller than the threshold value as a result of step S32, steps S31 to S33 are performed for the next communication mode.

  In the inter-communication mode load adjustment processing of FIG. 7, the communication mode change consultation for the multi-mode mobile station 200 is repeated until the number of mobile stations being connected simultaneously becomes a certain number or less.

  According to the second embodiment, the radio base station control manager performs radio communication control so as to periodically adjust the load between the communication modes. At this time, if the load of the communication mode is excessive, the MM mobile station control manager of the multi-mode mobile station 200 that is the least track record of use among the multi-mode mobile stations 200 connected in the communication mode. The wireless communication system is adjusted by consulting the change of the communication mode. As a result, it is possible to effectively use the radio communication system utilizing the degree of freedom of the radio communication scheme of the multi-mode mobile station 200.

  In general, the more mobile stations that simultaneously use one communication mode, the more the performance deteriorates. Therefore, it is possible to organize the mobile stations 200 that are being used in connection with an excessively loaded communication mode. It is preferable in terms of effective use.

  For example, if “WiMAX” is given as an example of the type of the wireless communication method, generally, high-speed wireless communication is possible when “WiMAX” is used. However, as the number of mobile stations connected simultaneously with “WiMAX” increases, contention of allocated subchannels occurs, and the possibility that desired performance cannot be obtained increases. For this reason, the radio base station control manager attempts to sort out the mobile stations that are simultaneously connected by “WiMAX” when the number of mobile stations that are simultaneously connected by “WiMAX” exceeds a certain number.

  At this time, it can be expected that the multimode mobile station 200 having the smallest use record of “WiMAX” has no particular problem even if it is a wireless communication system other than “WiMAX”. Therefore, the radio base station control manager starts the radios other than “WiMAX” in order from the multimode mobile station 200 having the lesser use record of “WiMAX” among the multimode mobile stations 200 connected simultaneously by “WiMAX”. Discuss changes to the communication method.

  By periodically executing such an operation, it is possible to provide a certain amount of communication capacity for each communication mode, and contribute to providing each mobile station 200 with stable communication quality. Can do.

  FIG. 8 is a conceptual diagram of the wireless communication system according to the third embodiment of the present invention. In FIG. 8, a radio relay station 100a is connected to a radio base station 300 called “infrastructure”. The mobile station 200a is connected to the radio relay station 100a. Therefore, the data transmitted from the mobile station 200a reaches the radio base station 300 via the radio relay station 100a.

  Here, consider the inclusive relation of communication capacity between the upstream side (wireless base station 300 side) and the downstream side (mobile station 200a side) of the wireless relay station 100a. The maximum communication speed of the access line # 1 between the radio base station 300 and the radio relay station 100a is “A”, and the access line # 2 between the radio relay station 100a and each mobile station 200a (# 1, # 2, # 3) The maximum communication speed is “X”, “Y”, “Z”.

First, in order to obtain a communication environment in which all mobile stations 200a (# 1, # 2, # 3) can use a sufficient communication speed, the relationship of the expression (1) is necessary.
A> X + Y + Z (1)

  As long as the relationship of the expression (1) is established, even if all the mobile stations 200a (# 1, # 2, # 3) communicate with the radio relay station 100a at the maximum communication speed, it is sufficient for the access line # 1. There is no problem because the communication speed of each access line # 2 is not limited.

Next, for example, the mobile station 200a (# 1) changes the communication mode, and the maximum communication speed of the access line # 2 related to the mobile station 200a (# 1) is changed to “X ′” which is considerably larger than “X”. Assume that the relationship of equation (1) is broken and the relationship of equation (2) is obtained.
A <X + Y + Z (2)

  Then, depending on the communication speed used by each mobile station 200a (# 1, # 2, # 3), the communication capacity of the access line # 1 becomes tight and the communication speed of each access line # 2 is limited. Can do.

  Therefore, in the third embodiment, the control managers coordinate with each other to adjust the communication mode so that the wireless communication system is effectively used.

  FIG. 9 is a block diagram of the radio relay station 100a and the mobile station 200a according to the third embodiment. In FIG. 9, the radio relay station 100a and the mobile station 200a are configured by a multimode radio communication apparatus. The radio relay station 100a includes a plurality of signal processing units 11-1, 2, 3, 4 and a control manager 12a using the SDR technology. A plurality of communication modes can be realized simultaneously by the signal processing units 11-1, 2, 3, and 4. Moreover, the communication mode which each signal processing part 11-1,2,3,4 is implement | achieved can be changed by SDR technique.

  The mobile station 200a has one signal processing unit 21a and a control manager 22a using the SDR technology. One communication mode can be realized by the signal processing unit 21a. However, the communication mode realized by the signal processing unit 21a can be changed by the SDR technique.

  FIG. 10 is a flowchart showing a control procedure of the control manager 12a of the radio relay station 100a shown in FIG. In FIG. 10, when the control manager 12a receives a wireless communication system change request from the mobile station 200a, the control manager 12a starts the control process of FIG. First, in step S41, the communication capacity “Cup” of the upstream access line # 1 is compared with the total communication capacity “Cdown” of the downstream access line # 2. As a result, when the relationship of “Cup> Cdown” is satisfied and the communication capacity of the upstream access line # 1 can include the total communication capacity of the downstream access line # 2, the process proceeds to step S42. A response permitting the change request is sent to the mobile station 200a that is the communication method change request source.

  On the other hand, if the result of step S41 does not satisfy the relationship “Cup> Cdown” and the communication capacity of the upstream access line # 1 cannot include the total communication capacity of the downstream access line # 2. In step S43, an attempt is made to expand the communication capacity of the upstream access line # 1.

  In step S43, it is determined whether or not the communication capacity of the upstream access line # 1 has already been maximized. As a result, if it has not yet reached the maximum, the process proceeds to step S45, and the communication capacity of the upstream access line # 1 is increased. Thereafter, the process returns to step S41. On the other hand, if the communication capacity of the upstream access line # 1 has already been maximized, the process proceeds to step S44.

  In step S44, the mobile station 200a other than the mobile station 200a that has requested to change the wireless communication method is inquired whether the communication speed can be reduced. As a result, when there is a mobile station 200a capable of reducing the communication speed, the total communication capacity “Cdown” of the access line # 2 on the downstream side is updated by subtracting the reduced communication speed, and the process returns to step S41. . On the other hand, if there is no mobile station 200a capable of reducing the communication speed as a result of step S44, the process proceeds to step S47, and a response for rejecting the change request is sent to the mobile station 200a that is the wireless communication method change request source. .

  FIG. 11 is a flowchart showing a control procedure of the control manager 22a of the mobile station 200a shown in FIG. In FIG. 11, the control manager 22a transmits a request for changing the wireless communication method to the wireless relay station 100a when it becomes necessary to change the wireless communication method due to a request in an upper layer or a change in the wireless propagation environment. Then, the control process of FIG. 11 is started. First, in step S51, it is determined whether a response from the radio relay station 100a has been received. As a result, when a change permission response is received from the radio relay station 100a, the process proceeds to step S52, and a process of changing the radio communication method is performed. On the other hand, if it is determined in step S51 that a change rejection response has been received from the radio relay station 100a, the process proceeds to step S53, where a process for canceling the change request for the radio communication scheme is performed, and the currently used radio communication scheme is continued.

  According to the third embodiment, the control manager of the radio relay station 100a adjusts the communication capacity based on the inclusion relationship between the upstream and downstream communication capacities of the radio relay station 100a. At this time, first, an attempt is made to expand the upstream communication capacity. Next, an attempt is made to adjust the reduction in communication capacity on the downstream side. This makes it possible to effectively use the wireless communication system that utilizes the degree of freedom of the wireless communication method of the multimode wireless communication apparatus.

  Note that the control manager of the radio relay station 100a periodically adjusts the communication capacity based on the inclusion relationship between the upstream and downstream communication capacities of the radio relay station 100a regardless of the request for changing the radio communication method. You may do it.

  According to this embodiment, the control manager provided in each wireless communication device operates in a coordinated manner, so that it is possible to adjust the wireless communication scheme for the multimode wireless communication device. Thereby, the effect that the effective utilization of a radio | wireless communications system can be aimed at is acquired.

  For example, if the communication mode being used by a certain multi-mode wireless communication device is redundant in terms of communication capacity for the multi-mode wireless communication device, the wireless communication device that is indispensable for the communication mode (regardless of the multi-mode or single mode) The wireless resources of the wireless communication system can be interchanged by “delegating” the use of the communication mode to a wireless communication apparatus in which the communication mode is essential. As a result, it is possible to obtain a special effect that the radio resource is effectively utilized, the radio resource utilization efficiency is improved, and the communication service is improved.

  The control manager according to the present embodiment may be realized by dedicated hardware, or may be configured by a memory and a CPU (central processing unit), and a program for realizing the function of the control manager The function may be realized by the CPU executing.

  As mentioned above, although embodiment of this invention was explained in full detail with reference to drawings, the specific structure is not restricted to this embodiment, The design change etc. of the range which does not deviate from the summary of this invention are included.

It is a conceptual diagram which shows the structure of the radio | wireless communications system which concerns on one Embodiment of this invention. It is a block diagram which shows the structure of the wireless base station 100 which concerns on the same embodiment. FIG. 3 is a block diagram showing a configuration of a multimode mobile station 200 according to the embodiment. It is a structural example of the connection mobile station profile memory | storage part 14 shown in FIG. It is a sequence diagram which shows the procedure of Example 1 of the cooperation operation | movement which the control manager which concerns on this invention performs. It is a sequence diagram which shows the procedure of Example 2 of the cooperation operation | movement which the control manager which concerns on this invention performs. It is an example of the procedure of the load adjustment process between communication modes of the wireless base station control manager which concerns on the Example 2. FIG. It is a conceptual diagram of the radio | wireless communications system of Example 3 which concerns on this invention. FIG. 6 is a block configuration diagram of a radio relay station 100a and a mobile station 200a according to the third embodiment. 10 is a flowchart showing a control procedure of a control manager 12a of the radio relay station 100a shown in FIG. 10 is a flowchart showing a control procedure of a control manager 22a of the mobile station 200a shown in FIG.

Explanation of symbols

11, 21... Wireless interface section, 11-1 to 4, 21 a... Signal processing section, 12, 12 a, 22, 22 a... Control manager, 13, 23 ... communication mode management section, 14. ... upper application section, 100 ... radio base station (multimode radio communication apparatus), 200, 200a ... mobile station (multimode radio communication apparatus, single mode radio communication apparatus), 100a ... radio relay station (multimode radio communication apparatus)

Claims (15)

In a wireless communication system capable of mixing a multi-mode wireless communication device capable of changing a communication mode representing a type of wireless communication method and an operation mode of the wireless communication method and a single-mode wireless communication device capable of changing the communication mode,
A wireless communication system characterized in that each wireless communication device is provided with a control manager that operates in coordination to adjust the communication mode between the wireless communication devices based on the communication capacity of the wireless communication system.   The wireless communication system according to claim 1, wherein the control manager consults the multimode wireless communication apparatus to change the communication mode based on a communication capacity of the wireless communication system. The control manager
Based on the connection request from the single mode wireless communication device, communication capacity calculating means for calculating the communication capacity of the wireless communication system,
Based on the calculation result, inquiry means for consulting the multi-mode wireless communication device to change the communication mode;
Connection control means for responding to the connection request based on the inquiry result;
The wireless communication system according to claim 2, further comprising: The control manager
Communication load calculating means for periodically calculating the communication load of the wireless communication system;
Based on the calculation result, inquiry means for consulting the multi-mode wireless communication device to change the communication mode;
The wireless communication system according to claim 2, further comprising:   The wireless communication system according to claim 3 or 4, wherein the inquiry means determines communication mode change consultation contents based on an inclusion relationship between upstream and downstream communication capacities of the relay station. . Provided means for recording the use record of the wireless communication method related to the multi-mode wireless communication device,
The wireless communication system according to any one of claims 3 to 5, wherein the inquiry means determines a communication mode change consultation content based on the usage record.   The wireless communication system according to claim 6, wherein the inquiry unit consults a decrease in communication speed based on a record of communication data amount.   The wireless communication system according to claim 2, wherein the control manager is provided in a multi-mode wireless base station. Wireless communication control in a wireless communication system in which a multi-mode wireless communication device capable of changing a communication mode representing a type of wireless communication method and an operation mode of the wireless communication method and a single-mode wireless communication device incapable of changing the communication mode can be mixed A method,
Each wireless communication device has a control manager,
The wireless communication control method, wherein the control managers operate in a coordinated manner to adjust a communication mode between wireless communication devices based on a communication capacity of the wireless communication system.   The wireless communication control method according to claim 9, wherein the control manager consults the multimode wireless communication apparatus to change the communication mode based on a communication capacity of the wireless communication system. The control manager calculates a communication capacity of the wireless communication system based on a connection request from a single mode wireless communication device; and
An inquiry step in which the control manager consults the multi-mode wireless communication device to change the communication mode based on the calculation result;
A connection control step in which the control manager responds to the connection request based on the inquiry result;
The wireless communication control method according to claim 10, further comprising: A communication load calculating step in which the control manager periodically calculates a communication load of the wireless communication system;
An inquiry step in which the control manager consults the multi-mode wireless communication device to change the communication mode based on the calculation result;
The wireless communication control method according to claim 10, further comprising:   The wireless communication control according to claim 11 or 12, wherein, in the inquiry step, a communication mode change consultation content is determined based on an inclusion relationship between upstream and downstream communication capacities of the relay station. Method. Record the use record of the wireless communication system related to the multi-mode wireless communication device,
The wireless communication control method according to any one of claims 11 to 13, wherein, in the inquiry step, a communication mode change consultation content is determined based on the usage record.   The wireless communication control method according to claim 14, wherein in the inquiry step, a decrease in communication speed is consulted based on a record of communication data amount.

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