JP5113607B2 - Wireless communication system - Google Patents

Description

  The present invention relates to a wireless communication system for transmitting reservation target data from a transmission device to a reception device.

  Conventionally, a wireless communication system that transmits data from a transmission device to a reception device via a network including a wireless base station is known.

  As such a wireless communication system, (1) a case where a receiving device such as a wireless terminal receives data (file or the like) from a transmitting device such as a transmission server (hereinafter referred to as server-MS type system), (2) a wireless terminal A case (hereinafter referred to as an MS-MS type system) in which a transmission device such as a device transmits data (such as mail) to a reception device such as a wireless terminal is conceivable.

  Since the wireless communication system includes a wireless section, the time required for data reception (or transmission) is more uncertain than the wired communication system.

  On the other hand, a technique for estimating the time required to receive (download) data based on the transmission status (transmission rate) in the wireless section has been proposed (for example, Patent Document 1).

In addition, in a wireless communication system, a technique for performing QoS (Quality of Service) control in consideration of a radio wave state between each terminal and a wireless base station is also known.
JP-A-2005-159420 ([0008], [0042] to [0045], etc.)

  By the way, data transmission from the transmission device to the reception device is performed at an arbitrary timing. Therefore, in a wireless communication system, a case where data in a wireless section is concentrated in a predetermined time zone can be considered. On the other hand, in a wireless communication system, there may be a case where a time zone in which no data is transmitted occurs.

  As described above, in the wireless communication system, there are times when the load on the wireless communication system is high and when the load on the wireless communication system is low. That is, congestion occurs in a time zone when the load of the radio communication system is high, and radio resources remain in a time zone where the load of the radio communication system is low.

  On the other hand, in the server-MS type system, if the receiving apparatus cannot receive data within a certain period, there may be a case where data reception is unnecessary. Further, in the MS-MS type system, there is a case where data transmission is unnecessary if data does not reach the receiving apparatus within a certain period.

  However, in the QoS control described above, the priority order of data is simply set according to the type of traffic (data). There may be a case where the receiving device cannot receive data within a certain period or a case where data does not reach the receiving device within a certain period.

  Therefore, the present invention has been made to solve the above-described problem, and avoiding congestion and effective use of radio resources by grasping specific data (reservation target data) to be received by a receiving apparatus within a certain period. An object of the present invention is to provide a wireless communication system that can be used.

  A wireless communication system according to a first feature includes a wireless base station that performs wireless communication with a terminal device. The radio base station includes a completion time setting unit (transmission reservation control unit 23) that sets a transmission completion time that is a time for completing transmission of reservation target data that is data to be transmitted, and the transmission completion A storage unit (transmission buffer 24) for storing non-reservation target data and the reservation target data for which time is not determined, and a transmission priority setting unit for setting a transmission priority for the non-reservation target data and the reservation target data (Transmission reservation control unit 23 and scheduler 25) and resource allocation for allocating radio resources used for transmission of the non-reservation target data and the reservation target data according to the transmission priority set by the transmission priority setting unit (Scheduler 25). The transmission priority setting unit sets the transmission priority for the reservation target data according to the transmission completion time.

  According to this feature, the radio base station separately manages reservation target data and non-reservation target data, and sets a transmission completion time for the reservation target data. Further, the radio base station sets a transmission priority for the reservation target data according to the transmission completion time. Therefore, the radio base station can manage specific data (reservation target data) so as to complete reception (or transmission) of data within a certain period.

  That is, the radio base station grasps specific data (reservation target data) to be received by the receiving device within a certain period. Therefore, it is possible to avoid congestion and effectively use radio resources.

  In the first feature, the reservation target data is data transmitted from a transmission device to the terminal device via the radio base station. The radio base station receives, from the terminal device, a notification message requesting transmission reservation of the reservation target data before receiving the reservation target data from the transmission device, and the notification In response to the message, a determination unit (transmission reservation control unit 23) that determines whether or not to accept a transmission reservation for the reservation target data based on a system load of the radio base station, and accepts a transmission reservation for the reservation target data A transmission unit (transmission unit 26) that transmits a determination result indicating whether or not to the terminal device.

  In the first feature, the radio base station includes a request unit (transmission reservation control unit 23) that requests the transmission apparatus to transmit a part of the reservation target data. The storage unit stores the reservation target data received from the transmission device. The request unit requests the transmission apparatus to transmit another part of the reservation target data according to the remaining amount of the reservation target data stored in the storage unit.

  In the first feature, the transmission priority setting unit assigns the transmission priority to the reservation target data according to a remaining amount of the reservation target data stored in the storage unit in addition to the transmission completion time. Set.

  In the first feature, the radio base station includes a first radio base station to which the terminal apparatus is already wirelessly connected, and a second radio base station to which the terminal apparatus is newly connected by radio. When the second radio base station detects a handover from the first radio base station to the second radio base station, the second radio base station indicates a transmission status of the reservation target data from the first radio base station to the terminal device. It has the acquisition part (reception part 21) to acquire.

  In the first feature, the wireless communication system further includes a management server (management server 60) that manages a transmission status of the reservation target data from the wireless base station to the terminal device. The acquisition unit acquires the transmission status of the reservation target data from the first radio base station to the terminal device from the management server.

  1st characteristic WHEREIN: The said acquisition part acquires the transmission condition of the said reservation object data with respect to the said terminal device from the said 1st radio base station from the said terminal device.

  In the first feature, the acquisition unit acquires a transmission status of the reservation target data from the first radio base station to the terminal device from the first radio base station.

  In the first feature, the radio base station includes a first radio base station to which the terminal apparatus is already wirelessly connected, and a second radio base station to which the terminal apparatus is newly connected by radio. When a handover from the first radio base station to the second radio base station is detected, the first radio base station indicates a transmission status of the reservation target data from the first radio base station to the terminal device. A notifying unit (transmitting unit 26) for notifying the second radio base station;

  In the first feature, the reservation target data is data transmitted from the transmission device to the reception device via the radio base station. The radio base station includes a transmission-side radio base station that is wirelessly connected to the transmission device, and a reception-side radio base station that is wirelessly connected to the reception device. The transmission-side radio base station, before receiving the reservation target data from the transmission device, a reception unit (reception unit 21) that receives a notice message requesting transmission reservation of the reservation target data from the transmission device; A determination unit (transmission reservation control unit 23) that determines whether or not to accept a transmission reservation for the reservation target data in accordance with the notice message based on a system load of the transmission-side radio base station, and a reception from the transmission device And a transmission unit (transmission unit 26) that transmits the reservation target data to the reception-side radio base station.

  In the first feature, the transmitting radio base station requests a request unit (transmission reservation) to transmit the reservation target data according to a system load of the transmitting radio base station and the transmission completion time. A control unit 23).

  In the first feature, the wireless communication system further includes a management server (management server 70) connected to the transmitting radio base station and the receiving radio base station. The management server is configured to request the transmission apparatus to transmit the reservation target data according to a system load of the transmitting radio base station, a system load of the receiving radio base station, and the transmission completion time. (Transmission control unit 73 and transmission unit 74).

  In the first feature, the management server receives the reservation target data stored in the relay buffer (relay buffer 75) that stores the reservation target data received from the transmitting radio base station, and the reservation target data stored in the relay buffer. A relay unit (transmission control unit 73) for transmitting to the receiving radio base station and the reservation target data directly from the transmitting radio base station to the receiving radio base station according to the system load of the receiving radio base station And an instruction unit (transmission control unit 73) for instructing the transmission side radio base station to transmit the reservation target data from the transmission side radio base station to the management server without transmission.

  In the first feature, the transmission completion time is determined according to a total data size of the reservation target data.

  In the first feature, a charge amount for transmission of the reservation target data is determined according to the transmission completion time.

  In the first feature, the notice message includes the transmission completion time.

  According to the present invention, there is provided a radio communication system capable of avoiding congestion and effectively utilizing radio resources by grasping specific data (reservation target data) to be received by a receiving apparatus within a certain period. For the purpose.

  Hereinafter, a wireless communication system according to an embodiment of the present invention will be described with reference to the drawings. In the following description of the drawings, the same or similar parts are denoted by the same or similar reference numerals.

  However, it should be noted that the drawings are schematic and ratios of dimensions and the like are different from actual ones. Therefore, specific dimensions and the like should be determined in consideration of the following description. Moreover, it is a matter of course that portions having different dimensional relationships and ratios are included between the drawings.

[First Embodiment]
(Configuration of wireless communication system)
Hereinafter, the configuration of the wireless communication system according to the first embodiment will be described with reference to the drawings. FIG. 1 is a diagram illustrating a wireless communication system according to the first embodiment.

  As illustrated in FIG. 1, the wireless communication system includes a terminal device 10, a wireless base station 20, a transmission server 30, and a network 40.

  The terminal device 10 performs wireless communication with the wireless base station 20. For example, the terminal device 10 receives reservation target data and non-reservation target data from the radio base station 20.

  The reservation target data is data that is a target of transmission reservation. Non-reservation target data is data that is not subject to transmission reservation. The transmission reservation is to reserve the transmission of the reservation target data so that the time for completing the transmission of the reservation target data (hereinafter referred to as the transmission completion time) is guaranteed. Therefore, the transmission completion time is set in the reservation target data.

  The radio base station 20 manages the communication area 120 and performs radio communication with the terminal device 10 that has registered the location in the communication area 120. For example, the radio base station 20 transmits reservation target data and non-reservation target data to the terminal device 10. It should be noted that the communication area 120 is an area defined by a frequency, a time slot, a code, and the like, and is not limited to a spatial area.

  The transmission server 30 transmits the reservation target data and the non-reservation target data to the terminal device 10 via the radio base station 20. The transmission server 30 is, for example, an FTP server that conforms to FTP (File Transfer Protocol), an HTTP server that conforms to HTTP (Hypertext Transfer Protocol), or a mail server that conforms to a mail protocol such as SMTP (Simple Mail Transfer Protocol). .

  The network 40 is a mobile communication network or the Internet network. The network 40 connects the radio base station 20 and the transmission server 30.

  In the first embodiment, the reservation target data is data transmitted from the transmission server 30 to the terminal device 10 via the radio base station 20. However, the reservation target data is not limited to this as will be described later.

  In the first embodiment, the non-reservation target data is data transmitted from the transmission server 30 to the terminal device 10 via the radio base station 20. However, the non-reservation target data is not limited to this. For example, the non-reservation target data may be other data transmitted to the terminal device 10 via the radio base station 20.

(Configuration of radio base station)
The configuration of the radio base station according to the first embodiment will be described below with reference to the drawings. FIG. 2 is a block diagram showing the radio base station 20 according to the first embodiment.

  As illustrated in FIG. 2, the radio base station 20 includes a reception unit 21, a load monitoring unit 22, a transmission reservation control unit 23, a transmission buffer 24, a scheduler 25, and a transmission unit 26.

  The receiving unit 21 receives data from the terminal device 10. For example, the receiving unit 21 receives a notice message requesting a reservation for transmission of the reservation target data before receiving the reservation target data. The notice message includes the transmission completion time of the reservation target data, the total data size of the reservation target data, and the like.

  The receiving unit 21 receives data from the transmission server 30. For example, the receiving unit 21 receives reservation target data and non-reservation target data.

  The load monitoring unit 22 monitors the system load of the radio base station 20. The system load of the radio base station 20 includes, for example, the propagation environment between the terminal device 10 and the radio base station 20, the amount of radio resources that can be allocated for data transmission to the terminal device 10, and the amount of data stored in the transmission buffer 24 For example, the buffer amount.

  The transmission reservation control unit 23 controls transmission reservation of reservation target data. First, the transmission reservation control unit 23 sets a transmission completion time in the reservation target data. As in the first embodiment, when the notice message includes a transmission completion time, the transmission reservation control unit 23 sets the transmission completion time included in the notice message as reservation target data.

  Secondly, the transmission reservation control unit 23 determines whether or not to accept a transmission reservation for the reservation target data according to the notice message.

  For example, the transmission reservation control unit 23 determines whether or not the transmission of the reservation target data having the total data size included in the notice message can be completed within the transmission completion time included in the notice message. Judge according to.

  The system load of the radio base station 20 may be the current system load at the time when the notice message is received. Further, the system load of the radio base station 20a may be a future system load (prediction) after the time when the notice message is received.

  Third, the transmission reservation control unit 23 requests the transmission server 30 to transmit the reservation target data when accepting the transmission reservation of the reservation target data. Here, the transmission reservation control unit 23 may request the reservation target data to be transmitted in a batch. The transmission reservation control unit 23 may request that the reservation target data be transmitted in a divided manner.

  In the following, a case where a divisional transmission of reservation target data is requested will be considered. First, the transmission reservation control unit 23 requests transmission of a part of the reservation target data. Next, the transmission reservation control unit 23 requests transmission of the other part of the reservation target data according to the remaining amount of the reservation target data accumulated in the transmission buffer 24. Of course, the number of divisions of the reservation target data may be two or more.

  Here, the transmission reservation control unit 23 preferentially requests transmission of the other part of the reservation target data as the remaining amount of the reservation target data stored in the transmission buffer 24 is small.

  Fourth, the transmission reservation control unit 23 instructs the scheduler 25 to allocate radio resources used for transmission of the reservation target data to the terminal device 10 when the reservation target data is stored in the transmission buffer 24. Specifically, the transmission reservation control unit 23 allocates radio resources used for transmission of reservation target data based on the remaining amount of reservation target data that has not yet been transmitted to the terminal device 10 and the transmission completion time of the reservation target data. To the scheduler 25. Further, the transmission reservation control unit 23 instructs the scheduler 25 on the data size of reservation target data to which radio resources are to be allocated.

  In the following, a case where a plurality of reservation target data is accumulated in the transmission buffer 24 will be considered. The transmission reservation control unit 23 instructs the scheduler 25 to transmit the reservation target data based on the remaining amount of reservation target data that has not yet been transmitted to the terminal device 10 and the transmission completion time of the reservation target data (hereinafter, referred to as “priority”). Set the instruction priority). The transmission reservation control unit 23 compares instruction priorities for a plurality of reservation target data, and instructs the scheduler 25 to allocate radio resources used for transmission of the reservation target data in order from the reservation target data having the highest instruction priority.

  Here, the higher the remaining amount of the reservation target data that has not yet been transmitted to the terminal device 10, the higher the instruction priority is set. Further, the lower the remaining time until the transmission completion time, the higher the instruction priority is set. Therefore, the instruction priority is updated as time passes.

  The transmission buffer 24 accumulates data transmitted to the terminal device 10. Specifically, the transmission buffer 24 stores reservation target data and non-reservation target data.

  The scheduler 25 allocates radio resources used for transmission of data stored in the transmission buffer 24. A radio resource is a radio channel defined by a frequency, a time slot, a code, and the like.

  Specifically, the scheduler 25 manages a transmission candidate list that is a list of data to be transmitted to the terminal device 10. The scheduler 25 allocates radio resources to the data listed in the transmission candidate list.

  In the following, an operation of adding data stored in the transmission buffer 24 to the transmission candidate list will be described.

(1) Non-reservation target data The scheduler 25 acquires QoS information of non-reservation target data accumulated in the transmission buffer 24. The QoS information includes a delay time allowed for data (allowable delay time), a transmission rate (VBR: Variable Bit Rate, CBR: Constant Bit Rate) set for the data, a priority set for the data (Priority Class), and the like. It is.

  Subsequently, the scheduler 25 adds the non-reservation target data stored in the transmission buffer 24 to the transmission candidate list according to the QoS information.

(2) Reservation target data The scheduler 25 waits for an instruction to allocate radio resources used for transmission of reservation target data. When the radio resource allocation is instructed from the transmission reservation control unit 23, the scheduler 25 adds reservation target data corresponding to the data size instructed from the transmission reservation control unit 23 to the transmission candidate list.

  The scheduler 25 issues a CQI (Channel Quality Indicator) request instruction for the reservation target data included in the transmission candidate list. The scheduler 25 receives CQI transmitted from the terminal device 10 in response to the CQI request instruction. Based on the CQI, the scheduler 25 determines a modulation scheme and a coding scheme (MCS) used for transmission of the reservation target data listed in the transmission candidate list. Further, the scheduler 25 allocates radio resources to the reservation target data listed in the transmission candidate list according to the modulation scheme and the coding scheme.

  The CQI is information indicating the quality of the radio section (transmission path) between the terminal device 10 and the radio base station 20.

  Here, the scheduler 25 preferentially adds the reservation target data to the transmission candidate list over the non-reservation target data when the radio resource allocation is instructed from the transmission reservation control unit 23.

  Since radio resources are allocated to data listed in the transmission candidate list, the priority added to the transmission candidate list is considered to be the priority (transmission priority) for transmitting the reservation target data and the non-reservation target data. Accordingly, the instruction priority described above is substantially synonymous with the transmission priority.

  The transmission unit 26 transmits data to the terminal device 10. For example, the transmission unit 26 transmits reservation target data and non-reservation target data using the radio resource allocated by the scheduler 25. Moreover, the transmission part 26 transmits the determination result which shows whether the transmission reservation of reservation object data is received.

  The transmission unit 26 transmits data to the transmission server 30. For example, the transmission unit 26 transmits data requesting transmission of reservation target data (transmission request).

(Operation of wireless communication system)
Hereinafter, the operation of the wireless communication system according to the first embodiment will be described with reference to the drawings. FIG. 3 is a sequence diagram illustrating an operation of the wireless communication system according to the first embodiment.

  As shown in FIG. 3, in step 10, the terminal device 10 transmits a notice message requesting transmission reservation of reservation target data to the radio base station 20. As described above, the notice message includes the transmission completion time of the reservation target data and the total data size of the reservation target data.

  In step 11, the radio base station 20 determines whether or not to accept a transmission reservation for reservation target data.

  In step 12, the radio base station 20 transmits a determination result indicating whether or not to accept a transmission reservation for the reservation target data to the terminal device 10. In the following, a case where a transmission reservation for reservation target data is accepted will be described.

  In step 13, the radio base station 20 transmits a transmission request for requesting transmission of reservation target data to the transmission server 30. In the following, a case where divided transmission of reservation target data is performed will be described. Accordingly, the radio base station 20 transmits a transmission request for requesting a part of reservation target data.

  In step 14, the transmission server 30 transmits a part of the reservation target data to the radio base station 20.

  In steps 15a to 15n, the radio base station 20 allocates radio resources used for transmission of reservation target data, and then transmits a part of the reservation target data to the terminal device 10 using the radio resources.

  In step 16, the radio base station 20 transmits a transmission request for requesting transmission of the other part of the reservation target data to the transmission server 30. As described above, the radio base station 20 requests transmission of the other part of the reservation target data based on the remaining amount of the reservation target data accumulated in the transmission buffer 24 and the transmission completion time of the reservation target data.

  In step 17, the transmission server 30 transmits the other part of the reservation target data to the radio base station 20.

  In Step 18a to Step 18n, the radio base station 20 allocates radio resources to be used for transmission of the reservation target data, and then transmits the other part of the reservation target data to the terminal device 10 using the radio resources.

  Note that the radio base station 20 requests transmission of the other part of the reservation target data (step 16) before the process of transmitting a part of the reservation target data to the terminal device 10 (step 15a to step 15n) is completed. May be performed.

(Function and effect)
In the first embodiment, the radio base station 20 manages reservation target data and non-reservation target data separately, and sets a transmission completion time for the reservation target data. Further, the radio base station 20 sets a transmission priority for the reservation target data according to the transmission completion time. Therefore, the radio base station 20 can manage specific data (reservation target data) so as to complete reception (or transmission) of data within a certain period. That is, the radio base station 20 grasps specific data (reservation target data) that the receiving apparatus should receive within a certain period. Therefore, it is possible to avoid congestion and effectively use radio resources.

[Modification of First Embodiment]
Below, the modification of 1st Embodiment is demonstrated, referring drawings. In this modification, a dedicated server for transmitting reservation target data to the radio base station 20 is provided.

(Configuration of wireless communication system)
Hereinafter, a configuration of a wireless communication system according to a modification of the first embodiment will be described with reference to the drawings. FIG. 4 is a diagram illustrating a wireless communication system according to a modification of the first embodiment. As illustrated in FIG. 4, the wireless communication system includes a dedicated server 50 in addition to the configuration illustrated in FIG. 1.

  The dedicated server 50 temporarily stores the reservation target data received from the transmission server 30. The dedicated server 50 transmits the reservation target data to the radio base station 20 instead of the transmission server 30.

  Accordingly, when receiving a transmission request for requesting transmission of reservation target data from the radio base station 20, the transmission server 30 transmits the reservation target data to the dedicated server 50 in a lump.

  In the divided transmission of the reservation target data, the transmission server 30 instructs the dedicated server 50 to transmit a part of the reservation target data to the radio base station 20 in response to a transmission request for requesting transmission of a part of the reservation target data. . Further, the radio base station 20 may transmit a transmission request for requesting transmission of a part of the reservation target data to the dedicated server 50.

[Second Embodiment]
The second embodiment will be described below with reference to the drawings. In the following, differences between the first embodiment and the second embodiment will be mainly described. Specifically, in the second embodiment, a case will be described in which the terminal device 10 that receives reservation target data performs handover between a plurality of radio base stations 20.

(Configuration of wireless communication system)
Hereinafter, the configuration of the wireless communication system according to the second embodiment will be described with reference to the drawings. FIG. 5 is a diagram illustrating a wireless communication system according to the second embodiment.

  As illustrated in FIG. 5, the wireless communication system includes a management server 60 in addition to the configuration illustrated in FIG. 1. The radio communication system includes a radio base station 20 a and a radio base station 20 b as the radio base station 20. The second embodiment exemplifies a case where handover from the radio base station 20a to the radio base station 20b is performed.

  The management server 60 manages the transmission status of the reservation target data from the radio base station 20 to the terminal device 10. For example, when the reservation target data is transmitted from the radio base station 20a to the terminal device 10, the management server 60 acquires the transmission status of the reservation target data from the radio base station 20a.

  When the handover from the radio base station 20a to the radio base station 20b is detected, the radio base station 20a transmits the transmission status of the reservation target data from the radio base station 20a to the terminal device 10 to the management server 60. Also good. Further, the radio base station 20a may transmit the transmission status of the reservation target data from the radio base station 20a to the terminal device 10 to the management server 60 at predetermined intervals.

  Here, the transmission status of the reservation target data may be information specifying reservation target data that has already been transmitted to the terminal device 10, or information specifying reservation target data that has not yet been transmitted to the terminal device 10. May be. The transmission status of the reservation target data preferably includes the transmission completion time of the reservation target data, the total data size of the reservation target data, the remaining data size of the reservation target data, and the like.

  When the handover from the radio base station 20a to the radio base station 20b is detected, the radio base station 20b inquires the management server 60 about the transmission status of the reservation target data from the radio base station 20a to the terminal device 10. Subsequently, the radio base station 20 b acquires the transmission status of the reservation target data from the radio base station 20 a to the terminal device 10 from the management server 60.

  The radio base station 20b specifies reservation target data that has not yet been transmitted to the terminal device 10 according to the transmission status of the reservation target data. Subsequently, the radio base station 20 b transmits to the transmission server 30 a transmission request for requesting transmission of reservation target data that has not yet been transmitted to the terminal device 10. The radio base station 20 b transmits to the terminal device 10 reservation target data that has not yet been transmitted to the terminal device 10. That is, the radio base station 20 b transmits the reservation target data to the terminal device 10 from the continuation of the reservation target data already transmitted to the terminal device 10.

(Operation of wireless communication system)
Hereinafter, operations of the wireless communication system according to the second embodiment will be described with reference to the drawings. FIG. 6 is a sequence diagram illustrating an operation of the wireless communication system according to the second embodiment.

  As shown in FIG. 6, in step 21a to step 21n, the radio base station 20a allocates radio resources used for transmission of reservation target data, and then transmits the reservation target data to the terminal device 10 using the radio resources. .

  In step 22, a handover from the radio base station 20a to the radio base station 20b is executed.

  In step 23, the radio base station 20b inquires the management server 60 about the transmission status of the reservation target data from the radio base station 20a to the terminal device 10.

  In step 24, the management server 60 transmits the transmission status of the reservation target data from the radio base station 20a to the terminal device 10 to the radio base station 20b.

  In step 25, the radio base station 20b specifies reservation target data that has not yet been transmitted to the terminal device 10 according to the transmission status of the reservation target data. Subsequently, the radio base station 20 b transmits to the transmission server 30 a transmission request for requesting transmission of reservation target data that has not yet been transmitted to the terminal device 10.

  In step 26, the transmission server 30 transmits the reservation target data that has not been transmitted to the terminal device 10 to the radio base station 20b.

  In step 27a to step 27n, the radio base station 20b assigns radio resources used for transmission of the reservation target data, and then uses the radio resources to transmit the reservation target data that has not been transmitted to the terminal device 10 to the terminal device 10. Send to.

(Function and effect)
In the second embodiment, the radio base station 20b acquires the transmission status of the reservation target data from the radio base station 20a to the terminal device 10. Therefore, even when a handover from the radio base station 20a to the radio base station 20b is performed, the transmission reservation of the reservation target data can be taken over from the radio base station 20a to the radio base station 20b.

[Modification of Second Embodiment]
In the second embodiment, the radio base station 20b acquires the transmission status of the reservation target data from the radio base station 20a to the terminal device 10 from the management server 60. However, the method for obtaining the transmission status of the reservation target data is not limited to this.

(Modification 1)
In the first modification of the second embodiment, the radio base station 20b inquires the terminal device 10 about the transmission status of the reservation target data from the radio base station 20a to the terminal device 10, and the transmission status of the reservation target data from the terminal device 10. get.

  Specifically, as shown in FIG. 7, in step 31a to step 31n, the radio base station 20a allocates radio resources used for transmission of the reservation target data, and then uses the radio resources to transmit the reservation target data to the terminal. Transmit to device 10.

  In step 32, a handover from the radio base station 20a to the radio base station 20b is executed.

  In step 33, the radio base station 20b inquires the terminal device 10 about the transmission status of the reservation target data from the radio base station 20a to the terminal device 10.

  In step 34, the terminal apparatus 10 transmits the transmission status of the reservation target data to the terminal apparatus 10 from the radio base station 20a to the radio base station 20b.

  In step 35, the radio base station 20b specifies reservation target data that has not yet been transmitted to the terminal device 10 according to the transmission status of the reservation target data. Subsequently, the radio base station 20 b transmits to the transmission server 30 a transmission request for requesting transmission of reservation target data that has not yet been transmitted to the terminal device 10.

  In step 36, the transmission server 30 transmits the reservation target data that has not been transmitted to the terminal device 10 to the radio base station 20b.

  In step 37a to step 37n, the radio base station 20b allocates radio resources to be used for transmission of the reservation target data, and uses the radio resources to transmit the reservation target data that has not yet been transmitted to the terminal apparatus 10. Send to.

  Note that in the first modification of the second embodiment, the management server 60 described above is unnecessary.

(Modification 2)
In the second modification of the second embodiment, the radio base station 20b acquires the transmission status of the reservation target data from the radio base station 20a to the terminal device 10 from the radio base station 20a.

  Specifically, as shown in FIG. 8, in step 41a to step 41n, the radio base station 20a allocates radio resources used for transmission of the reservation target data, and then uses the radio resources to transmit the reservation target data to the terminal. Transmit to device 10.

  In step 42, handover from the radio base station 20a to the radio base station 20b is executed.

  In step 43, the radio base station 20a transmits the transmission status of the reservation target data from the radio base station 20a to the terminal device 10 to the radio base station 20b.

  In step 44, the radio base station 20b identifies reservation target data that has not yet been transmitted to the terminal device 10 according to the transmission status of the reservation target data. Subsequently, the radio base station 20 b transmits to the transmission server 30 a transmission request for requesting transmission of reservation target data that has not yet been transmitted to the terminal device 10.

  In step 45, the transmission server 30 transmits the reservation target data that has not been transmitted to the terminal device 10 to the radio base station 20b.

  In Step 46a to Step 46n, the radio base station 20b allocates radio resources used for transmission of the reservation target data, and then uses the radio resources to transmit the reservation target data that has not yet been transmitted to the terminal device 10 to the terminal device 10. Send to.

  When the handover from the radio base station 20a to the radio base station 20b is detected, the radio base station 20b inquires the radio base station 20a about the transmission status of the reservation target data from the radio base station 20a to the terminal device 10. Also good.

  Note that in the second modification of the second embodiment, the management server 60 described above is not necessary.

(Other variations)
In the second embodiment, when a handover from the radio base station 20a to the radio base station 20b is detected, the radio base station 20b inquires the management server 60 about the transmission status of the reservation target data. However, the trigger for inquiring the transmission status of the reservation target data is not limited to this.

  For example, in the case where the terminal device 10 has made a reservation for transmission of reservation target data, when the terminal device 10 newly connects to the radio base station 20b, the terminal device 10 has been reserved for transmission of reservation target data. It may be notified to the radio base station 20b. As a case where the terminal apparatus 10 is newly connected to the radio base station 20b, in addition to the case where the handover from the radio base station 20a to the radio base station 20b is performed, the communication is reconnected after the communication is disconnected. A case, a case where the terminal device 10 is turned on, and the like are conceivable.

  In the second embodiment, the radio base station 20 b acquires reservation target data that has not been transmitted to the terminal device 10 from the transmission server 30. However, the method for taking over the transmission of the reservation target data from the radio base station 20a to the radio base station 20b is not limited to this.

  The radio base station 20b may acquire the reservation target data already stored in the radio base station 20a from the radio base station 20a among the reservation target data not yet transmitted to the terminal device 10.

  Here, the quality of the reservation target data that has not yet been transmitted to the terminal device 10 may be different according to the method of taking over transmission of the reservation target data from the radio base station 20a to the radio base station 20b. As described above, there are the following two methods for taking over transmission of the reservation target data from the radio base station 20a to the radio base station 20b.

(1) A method for newly acquiring reservation target data that has not yet been transmitted to the terminal device 10 from the transmission server 30 (2) Among reservation target data that has not yet been transmitted to the terminal device 10, it is already stored in the radio base station 20a. For Acquiring Reserved Reservation Target Data from Radio Base Station 20a [Third Embodiment]
Hereinafter, a third embodiment will be described with reference to the drawings. In the following, differences between the first embodiment and the third embodiment will be mainly described.

  In the third embodiment, the reservation target data is data transmitted from one terminal apparatus 10 to another terminal apparatus 10 via the radio base station 20. That is, in the third embodiment, the subject that transmits the reservation target data is not the transmission server 30 but the terminal device 10. The subject that transmits the notice message is not the terminal device 10 that receives the reservation target data, but the terminal device 10 that transmits the reservation target data.

(Configuration of wireless communication system)
The configuration of the wireless communication system according to the third embodiment will be described below with reference to the drawings. FIG. 9 is a diagram illustrating a wireless communication system according to the third embodiment.

  As illustrated in FIG. 9, the radio communication system includes a radio base station 20 a and a radio base station 20 b as the radio base station 20. The wireless communication system includes a wireless terminal 10 a and a wireless terminal 10 b as the terminal device 10. In the third embodiment, a case where the reservation target data is data transmitted from the radio terminal 10a to the radio terminal 10b via the radio base station 20a and the radio base station 20b is illustrated.

  The radio base station 20a is wirelessly connected to the radio terminal 10a. Similarly, in the wireless base station 20b, the wireless terminal 10b is wirelessly connected to the wireless terminal 10b.

  The radio base station 20a has the same configuration as the radio base station 20 according to the first embodiment. For example, the radio base station 20a determines whether or not to accept a transmission reservation for reservation target data in accordance with a notice message received from the radio terminal 10a. The radio base station 20a requests the radio terminal 10a to transmit reservation target data.

  Here, the radio base station 20a preferably determines the timing for requesting transmission of the reservation target data according to the system load of the radio base station 20a. For example, the radio base station 20a determines a timing when the system load is lower than a predetermined load as a timing for requesting transmission of reservation target data.

  The system load of the radio base station 20a may be the current system load when the notice message is received. Further, the system load of the radio base station 20a may be a future system load (prediction) after the time when the notice message is received.

  The radio base station 20a preferably determines the timing for requesting transmission of the reservation target data based on the transmission completion time. For example, the radio base station 20a advances the timing for requesting transmission of the reservation target data as the remaining time until the transmission completion time is shorter.

  The transmission completion time of the reservation target data includes (1) transmission completion time between the radio terminal 10a and the radio base station 20a, (2) transmission completion time between the radio base station 20b and the radio terminal 10b, (3) A transmission completion time between the wireless terminal 10a and the wireless terminal 10b can be considered.

  In the third embodiment, since the entity that determines whether or not to accept the transmission reservation and the entity that requests transmission of the reservation target data are the radio base stations 20a, the transmission completion time of the reservation target data is the same as that of the radio terminal 10a. The transmission completion time with the base station 20a is preferable.

(Operation of wireless communication system)
The operation of the wireless communication system according to the third embodiment will be described below with reference to the drawings. FIG. 10 is a sequence diagram illustrating an operation of the wireless communication system according to the third embodiment.

  As shown in FIG. 10, in step 50, the radio terminal 10a transmits a notice message requesting a transmission reservation for the reservation target data to the radio base station 20a. As described above, the notice message includes the transmission completion time of the reservation target data and the total data size of the reservation target data.

  In step 51, the radio base station 20a determines whether or not to accept a transmission reservation for reservation target data.

  In step 52, the radio base station 20a transmits to the radio terminal 10a a determination result indicating whether or not to accept a transmission reservation for the reservation target data. In the following, a case where a transmission reservation for reservation target data is accepted will be described.

  In step 53, the radio base station 20a transmits a transmission request for requesting transmission of reservation target data to the radio terminal 10a. As described above, the radio base station 20a preferably determines the transmission timing of the transmission request according to the system load of the radio base station 20a.

  In step 54, the radio terminal 10a transmits the reservation target data to the radio base station 20a.

  In step 55, the radio base station 20a transmits the reservation target data to the radio base station 20b.

  In step 56a to step 56n, the radio base station 20b allocates radio resources used for transmission of the reservation target data, and then transmits the reservation target data to the radio terminal 10b using the radio resources.

  In step 57a, the radio terminal 10b transmits data (ACK) indicating that the reservation target data has been received to the radio base station 20b. In step 57b, the radio base station 20b transmits the data (ACK) received from the radio terminal 10b to the radio base station 20a. In step 57c, the radio base station 20a transmits the data (ACK) received from the radio base station 20b to the radio terminal 10a.

(Function and effect)
In the third embodiment, similarly to the first embodiment, the radio base station 20 separately manages reservation target data and non-reservation target data, and sets a transmission completion time for the reservation target data. Further, the radio base station 20 sets a transmission priority for the reservation target data according to the transmission completion time. Therefore, the radio base station 20 can manage specific data (reservation target data) so as to complete reception (or transmission) of data within a certain period.

  That is, the radio base station 20 grasps specific data (reservation target data) that the receiving apparatus should receive within a certain period. Therefore, it is possible to avoid congestion and effectively use radio resources.

[Modification of Third Embodiment]
In the third embodiment, the entity that determines whether or not to accept a transmission reservation and the entity that requests transmission of reservation target data are the radio base stations 20a. However, these entities are not limited to the radio base station 20a. Absent.

(Modification 1)
In the first modification of the third embodiment, the entity that requests the wireless terminal 10a to transmit the reservation target data is a management server connected to both the wireless base station 20a and the wireless base station 20b.

(Configuration of wireless communication system)
Hereinafter, the configuration of the wireless communication system according to Modification 1 of the third embodiment will be described with reference to the drawings. FIG. 11 is a diagram illustrating a wireless communication system according to the third embodiment.

  As illustrated in FIG. 11, the wireless communication system includes a management server 70 in addition to the configuration illustrated in FIG. 9. The management server 70 is connected to both the radio base station 20a and the radio base station 20b. The management server 70 monitors both the system load of the radio base station 20a and the system load of the radio base station 20b.

  Specifically, as illustrated in FIG. 12, the management server 70 includes a reception unit 71, a load monitoring unit 72, a transmission control unit 73, and a transmission unit 74.

  The receiving unit 71 receives various data from the radio base station 20. For example, the receiving unit 71 receives a reservation reception indicating that a transmission reservation for reservation target data has been received from the radio base station 20a. The receiving unit 71 receives data indicating the system load of the radio base station 20a from the radio base station 20a. Similarly, the receiving unit 71 receives data indicating the system load of the radio base station 20b from the radio base station 20b.

  The load monitoring unit 72 monitors both the system load of the radio base station 20a and the system load of the radio base station 20b. The system load is, for example, a propagation environment between the terminal device 10 and the radio base station 20, a radio resource amount that can be allocated for data transmission to the terminal device 10, a buffer amount of data accumulated in the transmission buffer 24, and the like. .

  The transmission control unit 73 controls the timing at which the wireless terminal 10a is requested to transmit the reservation target data according to the system load monitored by the load monitoring unit 72. Specifically, the transmission control unit 73 determines the timing for requesting transmission of the reservation target data according to both the system load of the radio base station 20a and the system load of the radio base station 20b. For example, the transmission control unit 73 determines the timing when both the system load of the radio base station 20a and the system load of the radio base station 20b are lower than a predetermined load as the timing for requesting transmission of reservation target data.

  Moreover, it is preferable that the transmission control part 73 determines the timing which requests | requires transmission of reservation object data so that the time for reservation object data to stay in the radio base station 20a and the radio base station 20b may decrease.

  Furthermore, it is preferable that the transmission control unit 73 determines the timing for requesting transmission of the reservation target data based on the transmission completion time. For example, the transmission control unit 73 advances the timing for requesting transmission of the reservation target data as the remaining time until the transmission completion time is shorter.

  Note that since the entity that determines whether or not to accept the transmission reservation is the radio base station 20a, the transmission completion time of the reservation target data may be the transmission completion time between the radio terminal 10a and the radio base station 20a. preferable. However, since the entity that requests the transmission of the reservation target data is the management server, the transmission completion time of the reservation target data may be the transmission completion time between the wireless terminal 10a and the wireless terminal 10b.

  The transmission unit 74 transmits various data to the terminal device 10. For example, the transmission unit 74 transmits a transmission request for requesting transmission of reservation target data to the wireless terminal 10a.

(Operation of wireless communication system)
Hereinafter, the operation of the wireless communication system according to the first modification of the third embodiment will be described with reference to the drawings. FIG. 13 is a sequence diagram illustrating an operation of the wireless communication system according to the first modification of the third embodiment.

  As shown in FIG. 13, in step 60, the radio terminal 10a transmits to the radio base station 20a a notice message for requesting transmission reservation of the reservation target data. As described above, the notice message includes the transmission completion time of the reservation target data and the total data size of the reservation target data.

  In step 61, the radio base station 20a determines whether or not to accept a transmission reservation for reservation target data.

  In Step 62, the radio base station 20a transmits to the radio terminal 10a a determination result indicating whether or not to accept a transmission reservation for the reservation target data. In the following, a case where a transmission reservation for reservation target data is accepted will be described.

  In step 63, the radio base station 20 a transmits a reservation reception indicating that the transmission reservation of the reservation target data has been received to the management server 70.

  In step 64, the management server 70 transmits a transmission request for requesting transmission of the reservation target data to the wireless terminal 10a. As described above, the management server 70 preferably determines the transmission timing of the transmission request in consideration of both the system load of the radio base station 20a and the system load of the radio base station 20b.

  In step 65, the radio terminal 10a transmits the reservation target data to the radio base station 20a.

  In step 66, the radio base station 20a transmits the reservation target data to the radio base station 20b.

  In Step 67a to Step 67n, the radio base station 20b allocates radio resources used for transmission of the reservation target data, and then transmits the reservation target data to the radio terminal 10b using the radio resources.

  In step 68a, the radio terminal 10b transmits data (ACK) indicating that the reservation target data has been received to the radio base station 20b. In step 68b, the radio base station 20b transmits the data (ACK) received from the radio terminal 10b to the radio base station 20a. In Step 68c, the radio base station 20a transmits the data (ACK) received from the radio base station 20b to the radio terminal 10a.

(Modification 2)
In Modification 2 of the third embodiment, the management server 70 has a function of relaying reservation target data transmitted from the wireless terminal 10a to the wireless terminal 10b. The configuration of the wireless communication system is the same as that shown in FIG.

  As shown in FIG. 14, the management server 70 includes a relay buffer 75 in addition to the configuration shown in FIG. The relay buffer 75 stores reservation target data transmitted from the wireless terminal 10a to the wireless terminal 10b. Specifically, the relay buffer 75 stores reservation target data received from the radio base station 20a.

  Here, the transmission control unit 73 described above determines the timing for transmitting the reservation target data stored in the relay buffer 75 to the radio base station 20b according to the system load of the radio base station 20b. For example, the transmission control unit 73 determines the timing when the system load of the radio base station 20b is lower than a predetermined load as the timing for transmitting the reservation target data to the radio base station 20b.

  Moreover, it is preferable that the transmission control part 73 determines the timing which transmits reservation object data to the radio base station 20b based on transmission completion time. For example, the transmission control unit 73 advances the timing for transmitting the reservation target data to the radio base station 20b as the remaining time until the transmission completion time is shorter.

(Operation of wireless communication system)
Hereinafter, the operation of the wireless communication system according to the second modification of the third embodiment will be described with reference to the drawings. FIG. 15 is a sequence diagram illustrating operations of the wireless communication system according to the second modification of the third embodiment.

  As shown in FIG. 15, in step 70, the radio terminal 10a transmits to the radio base station 20a a notice message for requesting transmission reservation of reservation target data. As described above, the notice message includes the transmission completion time of the reservation target data and the total data size of the reservation target data.

  In step 71, the radio base station 20a determines whether or not to accept a transmission reservation for reservation target data.

  In Step 72, the radio base station 20a transmits to the radio terminal 10a a determination result indicating whether or not to accept a transmission reservation for the reservation target data. In the following, a case where a transmission reservation for reservation target data is accepted will be described.

  In step 73, the radio base station 20 a transmits a reservation reception indicating that the transmission reservation of the reservation target data has been received to the management server 70.

  In step 74, the management server 70 transmits to the radio base station 20a a relay instruction indicating that the management server 70 relays the reservation target data transmitted from the radio terminal 10a to the radio terminal 10b.

  In step 75, the management server 70 transmits a transmission request for requesting transmission of reservation target data to the wireless terminal 10a. As described above, the management server 70 preferably determines the timing for transmitting the transmission request according to the system load of the radio base station 20a.

  In the second modification of the third embodiment, the management server 70 does not have to consider the system load of the radio base station 20b when determining the timing for transmitting the transmission request.

  In step 76, the radio terminal 10a transmits the reservation target data to the radio base station 20a.

  In step 77, the radio base station 20 a transmits the reservation target data to the management server 70.

  In step 78, the management server 70 transmits the reservation target data to the radio base station 20b. As described above, the management server 70 preferably determines the timing for transmitting the reservation target data according to the system load of the radio base station 20b.

  In Step 79a to Step 79n, the radio base station 20b allocates radio resources used for transmission of the reservation target data, and transmits the reservation target data to the radio terminal 10b using the radio resources.

  In step 80a, the radio terminal 10b transmits data (ACK) indicating that the reservation target data has been received to the radio base station 20b. In Step 80b, the radio base station 20b transmits data (ACK) received from the radio terminal 10b to the radio base station 20a. In Step 80c, the radio base station 20a transmits the data (ACK) received from the radio base station 20b to the radio terminal 10a.

(Other variations)
Although not particularly mentioned in the third embodiment, the radio base station 20a determines whether or not to accept a transmission reservation for reservation target data according to the system load of the radio base station 20a and the system load of the radio base station 20b. May be. In such a case, the radio base station 20a inquires the radio base station 20b or the management server 70 about the system load of the radio base station 20b according to the notice message. Thereby, the radio base station 20 a receives the system load of the radio base station 20 b from the radio base station 20 b or the management server 70.

  In addition, since it is determined whether or not to accept a transmission reservation according to the system load of the radio base station 20a and the system load of the radio base station 20b, the transmission completion time of the reservation target data is determined by the radio terminal 10a and the radio terminal 10b. It is preferable that the transmission completion time be between.

  In the third embodiment, the entity that determines whether or not to accept a transmission reservation for reservation target data is the radio base station 20a. However, the entity that determines whether or not to accept a transmission reservation for reservation target data is not limited to this.

  For example, the management server 70 may determine whether to accept a reservation for transmission of reservation target data. In such a case, the management server 70 determines whether or not to accept a transmission reservation for reservation target data according to the system load of the radio base station 20a and the system load of the radio base station 20b.

  Since the management server 70 is the entity that determines whether or not to accept a transmission reservation, the transmission completion time of the reservation target data is preferably the transmission completion time between the wireless terminal 10a and the wireless terminal 10b.

[Other Embodiments]
Although the present invention has been described with reference to the above-described embodiments, it should not be understood that the descriptions and drawings constituting a part of this disclosure limit the present invention. From this disclosure, various alternative embodiments, examples and operational techniques will be apparent to those skilled in the art.

  Although not particularly mentioned in the above-described embodiment, when the reservation target data is changed in the transmission server 30 before the transmission of the reservation target data is completed, the transmission of the reservation target data is stopped.

  In the embodiment described above, the notice message includes the transmission completion time of the reservation target data and the total data size of the reservation target data. However, the information included in the notice message is not limited to this.

  For example, the notice message may include only the total data size of the reservation target data without including the transmission completion time of the reservation target data. In such a case, the transmission completion time of the reservation target data is automatically set based on the total data size of the reservation target data and the reference transmission rate (reference bit rate). For example, the transmission completion time is calculated by (total data size / reference bit rate) × N. However, N is a positive number larger than 1. In calculating the transmission completion time, it is preferable to exclude from the transmission time of the reservation target data the period when the power of the terminal apparatus 10 is turned off and the period when the reception level (SINR) of the terminal apparatus 10 is equal to or less than a predetermined threshold. .

  Further, the notice message may include only the transmission completion time of the reservation target data without including the total data size of the reservation target data.

  Although not particularly mentioned in the above-described embodiment, the transmission completion time of the reservation target data included in the notice message may be limited by the total data size of the reservation target data. For example, when the transmission completion time exceeds the estimated transmission completion time calculated by (total data size / reference bit rate) × N, the transmission completion time included in the notice message is limited to the transmission completion expected time. In the calculation of the estimated transmission completion time, a period in which the power of the terminal apparatus 10 is turned off and a period in which the reception level (SINR) of the terminal apparatus 10 is equal to or less than a predetermined threshold may be excluded from the transmission time of the reservation target data. preferable.

  Although not particularly mentioned in the above-described embodiment, when the reservation target data is an HTTP file, it is difficult to specify the total data size of the reservation target data in advance. Therefore, the notice message preferably includes a list of URLs that specify the HTTP file and a designated data size. In such a case, the radio base station 20 specifies a URL having an HTTP file having a total data size smaller than the designated data size from the list of URLs. The radio base station 20 acquires the HTTP file specified by this URL.

  Although not particularly mentioned in the above-described embodiment, the terminal device 10 according to the first embodiment may be applied to the wireless terminal 10b according to the third embodiment. In such a case, it is preferable that the transmission completion time between the radio terminal 10a and the radio base station 20a is included in a notice message transmitted from the radio terminal 10a to the radio base station 20a. On the other hand, it is preferable that the transmission completion time between the radio base station 20b and the radio terminal 10b is included in a notice message transmitted from the radio terminal 10b to the radio base station 20b.

  Although not particularly mentioned in the above-described embodiment, the billing amount for the reservation target data is preferably determined according to the transmission completion time of the reservation target data. Specifically, the billing amount for the reservation target data is set higher as the transmission completion time is earlier. Note that the charging entity for the reservation target data is preferably an entity that specifies the transmission completion time.

It is a figure which shows the radio | wireless communications system which concerns on 1st Embodiment. It is a block diagram which shows the radio base station 20 which concerns on 1st Embodiment. It is a sequence diagram which shows operation | movement of the radio | wireless communications system which concerns on 1st Embodiment. It is a figure which shows the radio | wireless communications system which concerns on the modification of 1st Embodiment. It is a figure which shows the radio | wireless communications system which concerns on 2nd Embodiment. It is a sequence diagram which shows operation | movement of the radio | wireless communications system which concerns on 2nd Embodiment. It is a sequence diagram which shows operation | movement of the radio | wireless communications system which concerns on the modification 1 of 2nd Embodiment. It is a sequence diagram which shows operation | movement of the radio | wireless communications system which concerns on the modification 2 of 2nd Embodiment. It is a figure which shows the radio | wireless communications system which concerns on 3rd Embodiment. It is a sequence diagram which shows operation | movement of the radio | wireless communications system which concerns on 3rd Embodiment. It is a figure which shows the radio | wireless communications system which concerns on the modification 1 of 3rd Embodiment. It is a block diagram which shows the management server 70 which concerns on the modification 1 of 3rd Embodiment. It is a sequence diagram which shows operation | movement of the radio | wireless communications system which concerns on the modification 1 of 3rd Embodiment. It is a block diagram which shows the management server 70 which concerns on the modification 2 of 3rd Embodiment. It is a sequence diagram which shows operation | movement of the radio | wireless communications system which concerns on the modification 2 of 3rd Embodiment.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 10 ... Terminal device, 20 ... Radio base station, 21 ... Reception part, 22 ... Load monitoring part, 23 ... Transmission reservation control part, 24 ... Transmission buffer, 25 ... Scheduler, 26 ... transmitting unit, 30 ... transmitting server, 40 ... network, 50 ... dedicated server, 60 ... management server, 70 ... management server, 71 ... receiving unit, 72 ... Load monitoring unit, 73 ... Transmission control unit, 74 ... Transmitting unit, 75 ... Relay buffer, 120 ... Communication area

Claims (15)

A wireless communication system including a wireless base station that performs wireless communication with a terminal device,
The radio base station is
A completion time setting unit for setting a transmission completion time, which is a time at which transmission of reservation target data, which is data to be subject to transmission reservation, is to be completed;
A storage unit that stores the non-reservation target data and the reservation target data for which the transmission completion time is not defined;
A transmission priority setting unit for setting a transmission priority for the non-reservation target data and the reservation target data;
A resource allocation unit that allocates radio resources used for transmission of the non-reservation target data and the reservation target data according to the transmission priority set by the transmission priority setting unit,
The transmission priority setting unit sets the transmission priority to the reservation target data according to the transmission completion time ,
The reservation target data is data transmitted from the transmission device to the terminal device via the wireless base station,
The radio base station is
Before receiving the reservation target data from the transmission device, a reception unit that receives a notice message requesting transmission reservation of the reservation target data from the terminal device;
In accordance with the notice message, a determination unit that determines whether to accept transmission reservation of the reservation target data based on a system load of the radio base station;
A wireless communication system , comprising: a transmission unit that transmits a determination result indicating whether or not to accept a transmission reservation of the reservation target data to the terminal device . The radio base station has a request unit that requests the transmitter to transmit a part of the reservation target data,
The storage unit stores the reservation target data received from the transmission device;
2. The request unit according to claim 1 , wherein the request unit requests the transmission device to transmit another part of the reservation target data according to a remaining amount of the reservation target data stored in the storage unit. Wireless communication system. The transmission priority setting unit sets the transmission priority for the reservation target data in accordance with the remaining amount of the reservation target data stored in the storage unit in addition to the transmission completion time. The wireless communication system according to claim 2 . The radio base station includes a first radio base station to which the terminal device is already wirelessly connected, and a second radio base station to which the terminal device is newly wirelessly connected,
When the second radio base station detects a handover from the first radio base station to the second radio base station, the second radio base station indicates a transmission status of the reservation target data from the first radio base station to the terminal device. The wireless communication system according to claim 1 , further comprising an acquisition unit that acquires the wireless communication system. A management server that manages the transmission status of the reservation target data from the radio base station to the terminal device;
The wireless communication system according to claim 4 , wherein the acquisition unit acquires the transmission status of the reservation target data from the first wireless base station to the terminal device from the management server. The wireless communication system according to claim 4 , wherein the acquisition unit acquires the transmission status of the reservation target data from the first radio base station to the terminal device from the terminal device. The radio communication system according to claim 4 , wherein the acquisition unit acquires the transmission status of the reservation target data from the first radio base station to the terminal device from the first radio base station. The radio base station includes a first radio base station to which the terminal device is already wirelessly connected, and a second radio base station to which the terminal device is newly wirelessly connected,
When a handover from the first radio base station to the second radio base station is detected, the first radio base station indicates a transmission status of the reservation target data from the first radio base station to the terminal device. The wireless communication system according to claim 1 , further comprising a notification unit that notifies the second wireless base station. A wireless communication system including a wireless base station that performs wireless communication with a terminal device,
The radio base station is
A completion time setting unit for setting a transmission completion time, which is a time at which transmission of reservation target data, which is data to be subject to transmission reservation, is to be completed;
A storage unit that stores the non-reservation target data and the reservation target data for which the transmission completion time is not defined;
A transmission priority setting unit for setting a transmission priority for the non-reservation target data and the reservation target data;
A resource allocation unit that allocates radio resources used for transmission of the non-reservation target data and the reservation target data according to the transmission priority set by the transmission priority setting unit,
The transmission priority setting unit sets the transmission priority to the reservation target data according to the transmission completion time,
The reservation target data is data transmitted from the transmission device to the reception device via the wireless base station,
The radio base station includes a transmission-side radio base station that is wirelessly connected to a transmission device, and a reception-side radio base station that is wirelessly connected to a reception device,
The transmitting radio base station is
Before receiving the reservation target data from the transmission device, a reception unit that receives a notice message requesting transmission reservation of the reservation target data from the transmission device;
A determination unit that determines whether to accept transmission reservation of the reservation target data based on the notice message, based on a system load of the transmitting radio base station;
A wireless communication system comprising: a transmission unit configured to transmit the reservation target data received from the transmission device to the reception-side radio base station. The transmission-side radio base station includes a request unit that requests the transmission apparatus to transmit the reservation target data according to a system load of the transmission-side radio base station and the transmission completion time. 9. The wireless communication system according to 9 . A management server connected to the transmitting radio base station and the receiving radio base station;
The management server is configured to request the transmission apparatus to transmit the reservation target data according to a system load of the transmitting radio base station, a system load of the receiving radio base station, and the transmission completion time. The wireless communication system according to claim 9 , further comprising: The management server
A relay buffer for accumulating the reservation target data received from the transmitting radio base station;
A relay unit that transmits the reservation target data stored in the relay buffer to the receiving radio base station;
Depending on the system load of the receiving radio base station, the management server does not transmit the reservation target data directly from the transmitting radio base station to the receiving radio base station. The wireless communication system according to claim 11 , further comprising: an instruction unit that instructs the transmitting wireless base station to transmit the reservation target data.   The wireless communication system according to claim 1, wherein the transmission completion time is determined according to a total data size of the reservation target data.   The wireless communication system according to claim 1, wherein a charge amount for transmission of the reservation target data is determined according to the transmission completion time. The wireless communication system according to claim 1 or 9 , wherein the notice message includes the transmission completion time.

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