JP2009055347A - Base station device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To distribute contents while considering receiving levels in terminal units. <P>SOLUTION: A terminal information memory unit 114 stores terminal informations including the receiving levels with respect to the respective terminal units which receive the distributed contents. A terminal classification unit 116 classifies the terminal units which receive the contents into a plurality of groups according to a predetermined terminal classification rule based on the terminal informations stored in the terminal information memory unit 114. A distributing method determining unit 118 determines a distributing method according to respective groups classified by the terminal classification unit 116. A distribution unit 110 distributes the contents employing the distributing method determined by the distributing method determining unit 118. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to communication technology, and more particularly to a base station device that distributes predetermined content.

In multicast distribution, the same data is transmitted to a plurality of terminal devices. The transmission speed at the time of multicast distribution is determined to be the lowest transmission speed in the physical standard for operation. In general, in multicast distribution, a terminal device that should receive data is not specified, and it is unknown how far the terminal device receives data from a base station device. For this reason, a transmission rate is used so that data can be received even in the worst condition where it is not known whether or not it actually exists. In view of this, a system has been considered in which a terminal device having the lowest reception level is detected among terminal devices that actually exist, and data is distributed at a transmission rate that can be received by the terminal device (see, for example, Patent Document 1). .
JP 2007-134976 A

  Although one or a small number of terminal devices among a plurality of terminal devices exist at a position far from the base station device, a case where many terminal devices exist in the vicinity of the base station device is assumed. In such a case, the reception level is low in the terminal device existing at a position far from the base station device. As a result, the transmission rate is determined so as to be suitable for one or a few terminal devices, so in many terminal devices the transmission rate is low even though the reception level is high near the base station device. turn into. As a result, high-quality content cannot be viewed.

  The present invention has been made in view of such circumstances, and an object of the present invention is to provide a communication technique for distributing content while taking into account the reception level at the terminal device.

  In order to solve the above-described problem, a base station apparatus according to an aspect of the present invention is a base station apparatus that distributes content to a plurality of terminal apparatuses by multicast, and a terminal that receives the distributed contents Based on the terminal information stored in the terminal information storage unit that stores the terminal information including the reception level for each of the devices and the terminal information stored in the terminal information storage unit, content is received according to a predetermined terminal classification rule Content using a terminal classification unit that classifies the terminal devices into a plurality of groups, a distribution method determination unit that determines a distribution method according to each group classified by the terminal classification unit, and a distribution method determined by the distribution method determination unit And a content distribution unit that distributes.

  It should be noted that any combination of the above-described constituent elements and a conversion of the expression of the present invention between a method, an apparatus, a system, a recording medium, a computer program, etc. are also effective as an aspect of the present invention.

  ADVANTAGE OF THE INVENTION According to this invention, a content can be distributed considering the reception level in a terminal device.

  Before describing the present invention in detail, an outline will be described. Embodiments of the present invention relate to a communication system including a base station apparatus and a plurality of terminal apparatuses. The base station apparatus and the plurality of terminal apparatuses are connected by a wireless line, and the transmission speed between them is set to a variable value. Further, the base station device multicasts the content to a plurality of terminal devices. There are two requirements for multicast delivery. One is to reliably receive content even in a terminal device remote from the base station device. The other is that a terminal device near the base station device receives high quality content that requires a high transmission rate. In the communication system according to the embodiment of the present invention, the following processing is executed in order to satisfy such a requirement.

  The base station apparatus classifies actually existing terminal apparatuses into a plurality of groups according to the reception level, and sets a transmission rate according to each group. As a result, multicast distribution at a transmission rate suitable for each terminal device is realized. For example, among all the terminal devices, 80% of terminal devices from the side closer to the base station device are included in “Group A”, and the remaining terminal devices are included in “Group B”. Also, content with different transmission speeds is prepared for the same content. Here, content with a high transmission rate corresponds to high-quality content. Also, the base station apparatus prepares different modulation schemes for different transmission rates, and multicasts the content at the transmission rates corresponding to each group.

  By dynamically changing the group assignment, transmission rates corresponding to various configurations are selected. Here, the terminal device may move. Therefore, the terminal device notifies the reception level to the base station device at regular intervals. Further, the base station apparatus reconfigures the group based on the notified reception level. As a result, the base station apparatus changes the transmission rate in accordance with the changing location and configuration of the terminal. Further, the base station device can grasp that the terminal device has stopped receiving the content when the notification of the reception level to be received periodically cannot be received.

  FIG. 1 shows an overview of a communication system 100 according to an embodiment of the present invention. The communication system 100 includes a first terminal device 20a, a second terminal device 20b, a third terminal device 20c, a fourth terminal device 20d, a fifth terminal device 20e, and a sixth terminal, which are collectively referred to as a base station device 10 and a terminal device 20. A device 20f, a seventh terminal device 20g, and an eighth terminal device 20h.

  The terminal device 20 receives the content distributed by multicast by the base station device 10. The terminal device 20 plays back the received content. For example, when the content is moving image data, the terminal device 20 displays the moving image on a display device (not shown). Note that the terminal device 20 measures the reception level when receiving the content from the base station device 10. Here, the reception level corresponds to the reception power, but may be a desired signal strength to interference power strength ratio or the like. Further, the terminal device 20 notifies the base station device 10 of the measured reception level.

  The base station apparatus 10 distributes content in a multicast manner. The area where the base station device 10 can distribute content is defined as a service area. Here, the base station apparatus 10 corresponds to a plurality of transmission rates. The service areas corresponding to the respective transmission rates have different sizes. For example, the lower the transmission rate, the smaller the service area. In FIG. 1, a plurality of service areas are shown as a first area 30, a second area 40, and a third area 50. Comparing the three areas relatively, the first area 30 has the smallest size and corresponds to the highest transmission rate, and the third area 50 has the largest size and the lowest. Corresponds to the transmission speed.

  The base station apparatus 10 classifies the plurality of terminal apparatuses 20 into two groups based on the reception level. In the embodiment, 80% of the terminal devices 20 from the higher reception level are included in the group A, and the rest are included in the group B. However, depending on the terminal device 20, the number of the terminal devices 20 is not exactly 80%. In that case, the number of terminal devices 20 to be included in the group A is adjusted so as not to exceed 80%. In the case of FIG. 1, the group A includes a first terminal device 20a, a second terminal device 20b, a third terminal device 20c, a fourth terminal device 20d, a seventh terminal device 20g, and an eighth terminal device 20h. Further, the group B includes a fifth terminal device 20e and a sixth terminal device 20f. Here, the first area 30 and the second area 40 correspond to the group A, and the third area 50 corresponds to the group B. The base station apparatus 10 determines an optimum transmission rate for each group, and performs multicast distribution using two transmission rates by time division.

  FIG. 2 shows the configuration of the communication system 100. The communication system 100 includes a base station device 10 and a terminal device 20. The base station apparatus 10 includes a reception level reception unit 102, a reception level management unit 104, a modulation processing unit 106, a content storage unit 108, and a distribution unit 110. The reception level management unit 104 includes a timer management unit 112, terminal information. A storage unit 114, a terminal classification unit 116, and a distribution method determination unit 118 are included. The terminal device 20 includes a receiving unit 202, a reception level notification generating unit 204, a reception level notification unit 206, a reception signal processing unit 208, and a content reproduction unit 210.

  As described above, the base station apparatus 10 multicasts the content to the plurality of terminal apparatuses 20. The terminal device 20 receives the distributed content, measures the reception level, and notifies the base station device 10 of the measurement result. Based on the reception level notification from the terminal device 20, the base station device 10 classifies the plurality of terminal devices 20 into two groups. Further, the base station apparatus 10 determines an optimum transmission rate for each group and performs distribution using two transmission rates by time division.

  The reception level receiving unit 102 receives a reception level notification from the terminal device 20. Here, the terminal device 20 corresponds to the terminal device 20 receiving the multicast distribution. Reception level reception unit 102 outputs the received reception level notification to reception level management unit 104. The reception level receiving unit 102 periodically receives a reception level notification and causes the reception level management unit 104 to update the terminal list stored in the reception level management unit 104. Details of the reception level notification and the terminal list will be described later.

  The reception level management unit 104 receives a reception level notification from the reception level reception unit 102. The reception level management unit 104 manages reception level notification and generates a terminal list. The terminal list is data including a terminal ID, a reception level, and information on a group to which the terminal belongs for each terminal device 20 receiving the content distributed by multicast. The terminal ID and the reception level are extracted from the reception level notification. The group is assumed to be group A or group B. The terminal information storage unit 114 stores a terminal list.

  More specifically, when the reception level management unit 104 receives the reception level notification from the reception level reception unit 102, the terminal device 20 that has transmitted the reception level notification refers to the terminal list stored in the terminal information storage unit 114. Check if it is listed in the device list. If not described, the reception level management unit 104 newly registers the content of the reception level notification in the terminal list. On the other hand, if it is described, the reception level management unit 104 checks whether there is a change in the reception level, and if it has changed, updates the terminal list.

  The timer management unit 112 manages the time that has elapsed since the reception level reception unit 102 received the reception level notification from the terminal device 20 for each terminal device 20. In addition, when there is a terminal device 20 in which the time elapsed since the reception level notification was last received exceeds the preset time, the timer management unit 112 uses the terminal list stored in the terminal information storage unit 114. The contents corresponding to the terminal device 20 are deleted. The terminal list stored in the terminal information storage unit 114 is updated by the processing of the reception level receiving unit 102 and the timer management unit 112 as described above.

  Based on the terminal list stored in the terminal information storage unit 114, the terminal classification unit 116 classifies the terminal devices 20 receiving content into a plurality of groups according to a predetermined terminal classification rule. Here, the terminal classification rule is to classify the plurality of terminal devices 20 into a plurality of groups at a predetermined ratio in order from the highest reception level. For example, referring to a terminal list corresponding to 80% of the number of all terminal devices 20 counted from the highest reception level in order, the terminal IDs in order from the highest reception level To extract.

  Extraction is continued until the extracted number does not exceed 80% of the total number of terminal devices 20. The terminal classification unit 116 ends the extraction when it exceeds 80%, and includes the extracted terminal device 20 in the group A. Further, the terminal classification unit 116 includes the rest in the group B. The terminal classification unit 116 updates the classification of the terminal device 20, that is, resets the group, triggered by the reception level receiving unit 102 updating the terminal list. When the group is updated, the distribution method determining unit 118 is notified to that effect, and a request is made to review the transmission rate.

  Distribution method determining section 118 determines a distribution method corresponding to each group classified by terminal classification section 116. Distribution method determining section 118 determines the transmission rate. For example, the distribution method determination unit 118 selects the terminal device 20 corresponding to the lowest reception level among the terminal devices 20 included in each group. The distribution method determination unit 118 also determines a transmission rate that can be received by the selected terminal device 20. For this purpose, the distribution method determination unit 118 stores a table in which the reception level and the transmission rate are associated with each other, and determines the transmission rate while referring to the table. Details of the table will be described later. As a result of the above processing, distribution method determining section 118 determines the transmission rate for group A and the transmission rate for group B. Also, the distribution method determination unit 118 re-determines the transmission rate, triggered by the update of the terminal list. When the transmission rate is changed, the distribution method determination unit 118 notifies the modulation processing unit 106 to that effect, and requests the change of the modulation method and the like.

  The content storage unit 108 stores content to be distributed. The storage format of the content may be arbitrary, but here, for the sake of clarity, it is assumed that even the content with the same content is stored separately for each transmission speed. The modulation processing unit 106 receives the transmission rate notification from the distribution method determination unit 118 and extracts content corresponding to the transmission rate from the content storage unit 108. In addition, the modulation processing unit 106 performs modulation processing on the extracted content using the modulation method received from the distribution method determination unit 118. Since there are two groups here, the modulation processing unit 106 performs the above-described processing for each group. The modulation processing unit 106 outputs the modulated content to the distribution unit 110. When receiving the notification of transmission rate change from the distribution method determining unit 118, the modulation processing unit 106 changes the modulation method according to the content.

  The distribution unit 110 distributes the content processed by the modulation processing unit 106 by multicast. That is, the distribution unit 110 performs multicast distribution using the distribution method determined by the distribution method determination unit 118. Here, the distribution unit 110 distributes the content in order from the content with the highest transmission speed even if the content has the same content. That is, the contents are distributed in the order of group A and group B. The distributed content is received by the terminal device 20.

  Next, the terminal device 20 will be described. The terminal device 20 receives the content distributed by multicast from the base station device 10 and measures the reception level. Further, the terminal device 20 periodically transmits the measured reception level to the base station device 10 as a reception level notification. The receiving unit 202 receives content distributed by multicast from the base station apparatus 10. The reception unit 202 outputs the received content to the reception signal processing unit 208. In addition, the reception unit 202 measures the reception level for the signal from the base station apparatus 10. The reception unit 202 outputs the measured reception level to the reception level notification generation unit 204.

  The reception level notification generation unit 204 receives the reception level from the reception unit 202. Also, the reception level notification generation unit 204 periodically generates a reception level notification from the reception level and its own terminal ID. Further, the reception level notification generation unit 204 outputs the generated reception level notification to the reception level notification unit 206. Upon receiving the reception level notification from the reception level notification generation unit 204, the reception level notification unit 206 transmits the reception level notification to the base station apparatus 10.

  The reception signal processing unit 208 receives content from the reception unit 202 and performs processing so that the content reproduction unit 210 can reproduce the content. The reception signal processing unit 208 determines which group the terminal device 20 belongs to when starting the processing (hereinafter, referred to as “group determination processing”). More specifically, the received signal processing unit 208 takes out the portion modulated for the group A from the content received from the receiving unit 202 and requests the content reproduction unit 210 to reproduce the content. Here, when the content reproduction unit 210 cannot reproduce the portion, the reception signal processing unit 208 extracts the portion modulated for the group B, and requests the content reproduction unit 210 to reproduce. In addition, the received signal processing unit 208, when the reception level measured by the receiving unit 202 is changed, when a change is seen in the modulation method of the received signal, when the processed content cannot be played back by the content playback unit 210 In addition, a group determination process is performed.

  The content reproduction unit 210 reproduces content in accordance with instructions from the reception signal processing unit 208. When the content cannot be reproduced, the content reproduction unit 210 notifies the reception signal processing unit 208 to that effect. In addition, the content reproduction unit 210 outputs the reproduced content to a display device or a speaker (not shown).

  This configuration can be realized in terms of hardware by a CPU, memory, or other LSI of any computer, and in terms of software, it is realized by a program having a communication function loaded in the memory. Describes functional blocks realized by collaboration. Accordingly, those skilled in the art will understand that these functional blocks can be realized in various forms by hardware only, software only, or a combination thereof.

  FIGS. 3A to 3D show the configuration of data used in the communication system 100. FIG. FIG. 3A shows the reception level notification. The reception level notification is generated so that the terminal device 20 notifies the base station device 10 of its own reception level. As illustrated, the reception level notification includes a terminal ID column 300 and a reception level column 302. The former indicates a terminal ID for identifying the terminal device 20 that is a transmission source, and the latter indicates a reception level. The reception level indicates the reception power at the terminal device 20, but is classified into levels A to F in this case in order to reduce the information amount of the reception level. Further, a MAC address is generally used for the terminal ID.

  FIG. 3B shows a terminal list. The terminal list is a list related to the reception level at the terminal device 20 that receives the content distributed by multicast from the base station device 10, is generated by the reception level management unit 104, and is held by the terminal information storage unit 114.・ It is managed. The terminal list includes a terminal ID column 304, a reception level column 306, and a group column 308 as illustrated. That is, the reception level and the belonging group are indicated for each terminal ID. The groups are classified by the terminal classification unit 116 according to the reception level. In addition, the terminal classification unit 116 classifies groups based on the terminal list.

  FIG. 3C shows a table in which reception levels are associated with transmission rates. This is data indicating the relationship between the reception level and the transmission rate, and is held in the distribution method determination unit 118. The table includes a reception level column 310 and a transmission rate column 312. In addition, the table is used for setting the transmission rate in the distribution method determination unit 118. Specifically, each group of group A or group B is specified with reference to the group column 308 of FIG. Subsequently, the lowest reception level in each group is specified with reference to the reception level column 306 in FIG. Further, a transmission rate corresponding to the specified reception level is determined with reference to FIG.

  Note that, in the terminal list of FIG. 3B and the table of FIG. 3C, group A includes six terminal devices 20 with the highest reception level of 80%, and group B includes the remaining terminals. A terminal device 20 is included. The terminal IDs corresponding to the former are “1”, “2”, “3”, “4”, “7”, “8”, and the terminal IDs corresponding to the latter are “5”, “6”. These correspond to FIG. Further, the reception level of the terminal device 20 classified into the group A is A or B. Therefore, a transmission rate of 36 Mbps corresponding to the reception level B is set as the transmission rate for the group A while referring to the table. Further, the reception level of the terminal device 20 classified into the group B is E. Therefore, a transmission rate of 6 Mbps corresponding to the reception level E is set as the transmission rate for the group B.

  FIG. 3D is an image diagram of distribution data distributed from the distribution unit 110 by multicast. Of these, “1-A” is data for group A, and is modulated so that the transmission rate is 36 Mbps. “1-B” is data for group B, and is modulated so that the transmission rate is 6 Mbps. Further, “1-A” and “1-B” have the same contents although the modulation schemes are different. Here, data with a high transmission speed is arranged first, such as data for group A first and data for group B after that. Thereby, when the terminal device 20 can reproduce the data for the group A, the terminal device 20 can skip the process for the data for the group B that follows. As a result, the processing of the terminal device 20 is simplified.

  An outline of the operation of the communication system 100 configured as above will be described. FIG. 4 is a flowchart showing a distribution procedure by the base station apparatus 10. The reception level receiving unit 102 detects whether a reception level notification is received from the terminal device 20 (S501). If not received (N in S501), the process is skipped to step 508. On the other hand, when the reception level reception unit 102 receives the reception level notification from the terminal device 20 (Y in S501), the reception level management unit 104 holds the transmission source of the reception level notification in the terminal information storage unit 114 It is determined whether it is a new terminal device 20 that is not listed in the terminal list that is being operated (S502).

  If it is not the new terminal device 20 (N in S502), it is determined whether or not the received reception level notification is changed compared to the reception level described in the terminal list (S503). If not changed (N in S503), the process is skipped to step 508. On the other hand, if the reception level has changed (Y in S503), the reception level management unit 104 updates the terminal list according to the received reception level notification (S510). When the transmission source of the reception level notification is the new terminal device 20 (Y in S502), the reception level management unit 104 registers the reception level in the terminal list (S504). Thereafter, according to the updated terminal list, the terminal classification unit 116 classifies the terminal devices 20 into two groups (S505).

  The distribution method determination unit 118 sets a transmission rate for each group (S506), and the distribution unit 110 distributes the content at the transmission rate (S507). Thereafter, it is determined whether there is a terminal device 20 that has not received the reception level notification for a certain period (S508). If there is (Y in S508), the reception level management unit 104 deletes the terminal device 20 from the terminal list. (S511). Further, the process returns to step 505. On the other hand, when there is no terminal device 20 that has not received the reception level notification for a certain period of time (N in S508), the base station device 10 determines whether to end the distribution (S509). If not completed (N in S509), the process returns to step 501. When the process is to be ended (Y in S509), all the processes are ended.

  FIG. 5 is a flowchart showing a distribution procedure by the terminal device 20. When the terminal device 20 performs the activation process (S601), the receiving unit 202 detects the reception level of the signal from the base station device 10 (S602). The reception level notification generation unit 204 transmits the reception level notification generated according to the detection result to the base station apparatus 10 (S603). Thereafter, the reception signal processing unit 208 receives a packet for the group A among the signals received by the reception unit 202 from the base station device 10 (S604), and determines whether the content reproduction unit 210 can reproduce the packet (S604). S605).

  If playback is possible (Y in S605), the received signal processing unit 208 and the content playback unit 210 determine that they belong to the group A and process the packet for the group A (S606). On the other hand, if the reproduction of the packet for group A is impossible (N in S605), the reception signal processing unit 208 and the content reproduction unit 210 determine that they belong to group B, and the packet for group B (S607). The content reproduction unit 210 reproduces content (S608). Thereafter, the terminal device 20 determines whether a certain time has elapsed since the reception level notification was transmitted (S609). If it has not elapsed (N in S609), the process returns to step 608.

  On the other hand, if a certain time has passed since the reception level notification was transmitted (Y in S609), the reception level notification unit 206 detects the reception level from the reception unit 202 and transmits the reception level notification to the base station apparatus 10. (S610). It is determined whether or not the detected reception level has changed (S611), and if it has changed (Y in S611), the process returns to step 604. If there is no change in the reception level (N in S611), it is determined whether there is a change in the transmission rate of each packet for the group A and for the group B (S612). If there is a change (Y in S612), the process returns to step 604. On the other hand, if there is no change in the transmission speed (N in S612), it is determined whether or not to end the reception (S613). If not completed (N in S613), the process returns to step 608. If the process is to be ended (Y in S613), the process is ended.

  According to the embodiment of the present invention, even when multicast distribution is performed, the transmission rate is set for each group, so that it is possible to distribute at various transmission rates. In addition, since the groups are classified according to the reception level at the terminal device, the content can be distributed while considering the reception level at the terminal device. In addition, since the transmission rate is increased for a group with a high reception level and the transmission rate is decreased for a group with a low reception level, both high-quality content distribution and content reception can be ensured. In addition, since the classification is updated as appropriate, it is possible to follow changes in the transmission environment. In addition, since the terminal device whose period after receiving the reception level is long is excluded from the classification target, the terminal device to be distributed can be adapted to the latest state. In addition, since the content is distributed in order from the highest transmission rate, if the content can be reproduced, the lower transmission rate content may be ignored, so the processing can be simplified.

  In the above, this invention was demonstrated based on the Example. This embodiment is an exemplification, and it will be understood by those skilled in the art that various modifications can be made to the combination of each component and each processing process, and such modifications are also within the scope of the present invention. .

  In the embodiment of the present invention, the terminal classification unit 116 classifies the plurality of terminal devices 20 with the remaining 80% of the highest reception level and the rest. However, the present invention is not limited to this. For example, in addition to such a rule, the terminal classifying unit 116 sets the transmission rate of the group A to a preset level when the transmission rate of the group A is equal to or lower than a preset level. You may provide the rule of classifying so that it may become. That is, the terminal classification unit 116 moves the terminal device 20 below the set level to a lower group if there is a reception level below the set level in each group. According to this modification, a certain transmission rate can be guaranteed for the group A.

  In addition, after classifying the terminal devices 20 into the upper 80% of reception levels and the rest, the average value of the reception levels of group A is calculated, and among the terminal devices 20 belonging to group A, the reception level is less than the average value If there are a certain number or more, the top 70% of the terminal devices 20 may be group A.

  In the embodiment of the present invention, the terminal classification unit 116 performs classification into two groups, group A and group B. However, the present invention is not limited to this. For example, the terminal classification unit 116 may perform classification into three or more groups, and may adaptively change the number of groups. According to this modification, the transmission rate can be set in detail.

  In this embodiment, a plurality of contents corresponding to the transmission speed are prepared. However, an error correction code corresponding to the transmission speed may be added to the same contents. That is, when the transmission rate is high, more error correction codes are added, and the terminal device 20 can reproduce the content more accurately. This eliminates the need to prepare a plurality of contents.

It is a figure which shows the outline | summary of the communication system which concerns on the Example of this invention. It is a figure which shows the structure of the communication system of FIG. FIGS. 3A to 3D are diagrams showing the configuration of data used in the communication system of FIG. It is a flowchart which shows the delivery procedure by the base station apparatus of FIG. It is a flowchart which shows the delivery procedure by the terminal device of FIG.

Explanation of symbols

  10 base station apparatus, 20 terminal apparatus, 100 communication system, 102 reception level reception section, 104 reception level management section, 106 modulation processing section, 108 content storage section, 110 distribution section, 112 timer management section, 114 terminal information storage section, 116 terminal classification unit, 118 distribution method determination unit, 202 reception unit, 204 reception level notification generation unit, 206 reception level notification unit, 208 reception signal processing unit, 210 content reproduction unit

Claims (7)

A base station device that distributes content to a plurality of terminal devices by multicast,
A terminal information storage unit for storing terminal information including a reception level for each of the terminal devices receiving the content being distributed;
Based on the terminal information stored in the terminal information storage unit, in accordance with a predetermined terminal classification rule, a terminal classification unit that classifies terminal devices receiving content into a plurality of groups;
A distribution method determination unit that determines a distribution method according to each group classified by the terminal classification unit;
A content distribution unit that distributes content using the distribution method determined by the distribution method determination unit;
A base station apparatus comprising: A reception level receiving unit that receives the reception level from the terminal device and updates the terminal information stored in the terminal information storage unit according to the reception level;
The terminal classification unit updates the classification of the terminal device, triggered by the terminal information being updated by the reception level reception unit,
The base station apparatus according to claim 1, wherein the distribution method determination unit re-determines a distribution method using the reception level reception unit as a trigger when terminal information is updated. The reception level receiving unit further includes a timer management unit that manages the time elapsed since receiving the reception level from the terminal device for each terminal device,
The timer management unit corresponds to the terminal device from the terminal information stored in the terminal information storage unit when there is a terminal device in which the time elapsed after receiving the reception level exceeds a preset time. The base station apparatus according to claim 2, wherein the terminal information is deleted.   4. The terminal classification rule in the terminal classification unit classifies a plurality of terminal devices into a plurality of groups at a predetermined ratio in order from the highest reception level. The base station apparatus in any one.   The terminal classification rule in the terminal classification unit classifies a plurality of terminal devices into a plurality of groups at a predetermined ratio in order from the highest reception level, and each group has a reception level equal to or lower than the set level. 4. The base station apparatus according to claim 1, wherein a terminal apparatus below a set level is moved to a lower group.   The terminal classification rule in the terminal classification unit classifies a plurality of terminal devices into a plurality of groups at a predetermined ratio in order from the highest reception level, and the reception level is higher than the average reception level in each group. The base station apparatus according to any one of claims 1 to 3, wherein a classification ratio in the terminal classification rule is changed when a low terminal apparatus exists in a certain ratio or more. The delivery method determining unit determines a transmission speed as a delivery method,
The base station apparatus according to claim 1, wherein the content distribution unit distributes content in order from content with a high transmission rate.

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